CA2167945C - Method and system for automatic optimization of data throughput using variable packet length and code parameters - Google Patents
Method and system for automatic optimization of data throughput using variable packet length and code parameters Download PDFInfo
- Publication number
- CA2167945C CA2167945C CA002167945A CA2167945A CA2167945C CA 2167945 C CA2167945 C CA 2167945C CA 002167945 A CA002167945 A CA 002167945A CA 2167945 A CA2167945 A CA 2167945A CA 2167945 C CA2167945 C CA 2167945C
- Authority
- CA
- Canada
- Prior art keywords
- predetermined
- packet
- receiving unit
- coding rate
- error
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/24—Time-division multiplex systems in which the allocation is indicated by an address the different channels being transmitted sequentially
- H04J3/247—ATM or packet multiplexing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
- H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0025—Transmission of mode-switching indication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1874—Buffer management
Abstract
A method and communication system provide for automatic optimization of data throughput by adjusting the encoder to use a long packet length and an increased channel coding efficiency during periods of low error counts and a short packet length and an increased channel coding redundancy during periods of high error counts.
Description
' ~ ~ 2167945 Method and System for Automatic Optimization of Data Throughput Using Variable Packet Length and - Code Parameters Field of the Invention The present invention relates to data communication networks, and more particularly to optimizing data throughput in communication networks.
Background The transmission medium and impairments to a communication channel due to noise and interference typically cause ~:rrors in data sent through communication networks.
Where the channel error-rate has wide variations, use of forward error correction techniques can be inefficient. The inefficiency is brought about by the constant transmission of a large amount of redundancy so that heavily-errored patterns will not be interpreted incorrectly. The redundancy must always be transmitted even though the heavily-errored patterns may be rare. In addition, forward error correction algorithms have a tendency to require complex or computationally intensive decoders to determine which bits are incorrect.
Conventional automatic repeat request (ARQ) algorithms which packetize data, detect errors, and request retransmission of packets are implemented with less complexity than forward error correction methods but are still vulnerable to the design compromise of including large amounts of redundancy in order to avoid falsing on receive sequences containing large numbers of errors.
Background The transmission medium and impairments to a communication channel due to noise and interference typically cause ~:rrors in data sent through communication networks.
Where the channel error-rate has wide variations, use of forward error correction techniques can be inefficient. The inefficiency is brought about by the constant transmission of a large amount of redundancy so that heavily-errored patterns will not be interpreted incorrectly. The redundancy must always be transmitted even though the heavily-errored patterns may be rare. In addition, forward error correction algorithms have a tendency to require complex or computationally intensive decoders to determine which bits are incorrect.
Conventional automatic repeat request (ARQ) algorithms which packetize data, detect errors, and request retransmission of packets are implemented with less complexity than forward error correction methods but are still vulnerable to the design compromise of including large amounts of redundancy in order to avoid falsing on receive sequences containing large numbers of errors.
2.
Thus, there is a need for a method and a communication system having efficient and highly reliable error-detection that automatically optimize data throughout of a channel.
Summary of Invention According to one aspect of the invention a method for maximizing channel efficiency in a data channel having varying transmission error conditions, comprising the steps of A) receiving a packet from a transmitting unit by a receiving unit; B) adjusting, by the receiving unit, a selectable encoder of the transmitting unit, wherein at least one of C-F; C) upon receiving, by a channel decoder of the receiving unit from a first transceiver of the transmitting unit, the packet and determining, by the channel decoder of the receiving unit, that at least a predetermined number of codewords of the packet have errors; C1) sending, by a second transceiver of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a length of the packet from a first predetermined packet length to a second predetermined packet length and; C2) resetting, by the second transceiver of the receiving unit, the channel decoder of the receiving unit accordingly; D) upon requesting, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of retransmissions and receiving, by the channel decoder of the receiving unit, the same packet having errors; D1) sending, by the channel decoder of the receiving unit utilizing the second transceiver of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the packet from the first predetermined packet length to the second - 2a predetermined packet length; D2) resetting, by the second transceiver of the receiving unit, the channel decoder of the receiving unit accordingly; E) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, the packet having a codeword of the predetermined number of codewords of the packet with an error count greater than a predetermined threshold; E1) sending, by the channel decoder of the receiving unit utilizing the second transceiver of the receiving unit, a signal for resetting the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the packet from the first predetermined packet length to the second predetermined packet length; E2) resetting, by the second transceiver of the receiving unit, the channel decoder of the receiving unit accordingly, and; F) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of consecutive error-free packets; F1) sending, by the channel decoder of the receiving unit utilizing the second transceiver of the receiving unit, a signal for resetting the transmitting unit from the second predetermined channel coding rate to the first predetermined channel coding rate and changing the length of the packet from the second predetermined packet length to the first predetermined packet length; F2) resetting, by the second transceiver of the receiving unit, the channel decoder of the receiving unit accordingly, wherein, for steps C-F
the second predetermined channel coding rate is less than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length is provided.
second predetermined channel coding rate is approximately 70 percent.
According to another aspect a communication system for maximizing channel efficiency in a data channel having varying transmission error 2b conditions, comprising at a transmitting unit; A) a buffered data source, for providing data for transmitting, B) a selectable encoder, operably coupled to the buffered data source, for encoding the data into packets in accordance with a predetermined scheme using one of: an efficient channel encoder or a robust channel encoder; C) a first transceiver, operably coupled to the selectable encoder, for transmitting the packets of data to a receiving unit and for receiving error information from the receiving unit, at the receiving unit; D) a second transceiver, for receiving a plurality of received packets of data from the first transceiver and transmitting the error information from a channel decoder of the receiving unit to the first transceiver; E) the channel decoder, operably coupled to the second transceiver, for decoding the plurality of received packets of data and determining the error information wherein the following steps F-G are implemented; F) receiving a received packet of the plurality of received packets from the transmitting unit by the receiving unit; G) adjusting, by the receiving unit, the selectable encoder of the transmitting unit, wherein one of H-K; H) wherein: H1) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, the received packet; H2) determining by the channel decoder of the receiving unit, that at least a predetermined number of codewords of the received packet have errors; H3) sending a signal for resetting the selectable encoder of the transmitting unit from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a length of the received packet from a first predetermined packet length to a second predetermined packet length; H4) resetting the channel decoder of the receiving unit accordingly; I) wherein: 11 ) upon requesting, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of retransmissions; 12) receiving, by the channel decoder of the receiving unit, the same received packet having errors; 13) 2c sending, by the channel decoder of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the received packet from the first predetermined packet length to the second predetermined packet length; 14) resetting the channel decoder of the receiving unit accordingly; J) wherein: J1) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, the received packet of the plurality of received packets having a codeword with an error count greater than a predetermined threshold; J2) sending, by the channel decoder of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the received packet from the first predetermined packet length to the second predetermined packet length; J3) resetting the channel decoder of the receiving unit accordingly; K) wherein: K1) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of consecutive error-free packets; K2) sending, by the channel decoder of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the second predetermined channel coding rate to the first predetermined channel coding rate and changing the length of the received packet from the second predetermined packet length to the first predetermined packet length; K3) resetting the channel decoder of the receiving unit accordingly, wherein, for steps H-K the second predetermined channel coding rate is less than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length; F) and a data sink, operably coupled to the channel decoder, for receiving decoded received data.
2d Brief Descriptions of the Drawings FIG. 1 is a block diagram of a communication system that operates in accordance with the method of the present invention.
FIG. 2 illustrates the format of the efficient, long packet mode and the robust, short packet mode.
FIG. 3 is a flow chart of an embodiment of steps in accordance with the method of the present invention.
FIG. 4 is a flow chart showing a particular embodiment of the method of the present invention wherein the input packet is in the efficient, long packet mode.
FIG. 5 is a flow chart showing another embodiment of the method of the present invention wherein the input packet is in the robust, short packet mode.
Detailed Description of a Preferred Embodiment The present invention provides a method and a communication system having efficient and highly-reliable error-detection that automatically optimize data throughput of a channel whose error properties vary over time by selecting a length of a packet and a channel coding rate in a packet such that throughput is maximized during periods when relatively few errors are found in packets and data redundancy is increased to provide a more robust system during periods when the number of errors of three particular 216'~~45 types of errors exceeds three respective predetermined threshold levels.
FIG. 1, numeral 100, is a block diagram of a communication system that operates in accordance with the method of the present invention. The invention includes a communication system for maximizing channel efficiency in a data channel having varying transmission error conditions, wherein the communication system includes a transmitting unit (102) and a receiving unit (104), described more fully as follows. The transmitting unit (102) includes: a buffered data source (106), for providing data for transmitting; a selectable encoder (108), operably coupled to the buffered data source (106), for encoding the data into packets in accordance with a predetermined scheme using one of: an efficient channel encoder (110) and a robust channel encoder (112); a first transceiver (114), operably coupled to the selectable encoder (108), for transmitting the packets of data to the receiving unit (104) and for receiving error information from the receiving unit (104).
Buffered data source (106) provides a stream of data bits which may be grouped in information vectors U1, U2, ..., UL, where L is a first predetermined integer, and the channel encoder (110) typically maps the vectors into channel vectors V1, V2, ..., VL, or alternatively, buffered data source (106) provides a stream of data bits which may be grouped in information vectors u1, u2, ..., us, where s is a second predetermined integer, and the channel encoder (112) then typically maps the vectors into channel vectors v1, v2, ..., vs.
In the preferred embodiment, L is selected to be greater than s.
The receiving unit (104) includes: a second transceiver (116), for receiving the transmitted data from the first 216'~~4~
Thus, there is a need for a method and a communication system having efficient and highly reliable error-detection that automatically optimize data throughout of a channel.
Summary of Invention According to one aspect of the invention a method for maximizing channel efficiency in a data channel having varying transmission error conditions, comprising the steps of A) receiving a packet from a transmitting unit by a receiving unit; B) adjusting, by the receiving unit, a selectable encoder of the transmitting unit, wherein at least one of C-F; C) upon receiving, by a channel decoder of the receiving unit from a first transceiver of the transmitting unit, the packet and determining, by the channel decoder of the receiving unit, that at least a predetermined number of codewords of the packet have errors; C1) sending, by a second transceiver of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a length of the packet from a first predetermined packet length to a second predetermined packet length and; C2) resetting, by the second transceiver of the receiving unit, the channel decoder of the receiving unit accordingly; D) upon requesting, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of retransmissions and receiving, by the channel decoder of the receiving unit, the same packet having errors; D1) sending, by the channel decoder of the receiving unit utilizing the second transceiver of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the packet from the first predetermined packet length to the second - 2a predetermined packet length; D2) resetting, by the second transceiver of the receiving unit, the channel decoder of the receiving unit accordingly; E) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, the packet having a codeword of the predetermined number of codewords of the packet with an error count greater than a predetermined threshold; E1) sending, by the channel decoder of the receiving unit utilizing the second transceiver of the receiving unit, a signal for resetting the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the packet from the first predetermined packet length to the second predetermined packet length; E2) resetting, by the second transceiver of the receiving unit, the channel decoder of the receiving unit accordingly, and; F) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of consecutive error-free packets; F1) sending, by the channel decoder of the receiving unit utilizing the second transceiver of the receiving unit, a signal for resetting the transmitting unit from the second predetermined channel coding rate to the first predetermined channel coding rate and changing the length of the packet from the second predetermined packet length to the first predetermined packet length; F2) resetting, by the second transceiver of the receiving unit, the channel decoder of the receiving unit accordingly, wherein, for steps C-F
the second predetermined channel coding rate is less than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length is provided.
second predetermined channel coding rate is approximately 70 percent.
According to another aspect a communication system for maximizing channel efficiency in a data channel having varying transmission error 2b conditions, comprising at a transmitting unit; A) a buffered data source, for providing data for transmitting, B) a selectable encoder, operably coupled to the buffered data source, for encoding the data into packets in accordance with a predetermined scheme using one of: an efficient channel encoder or a robust channel encoder; C) a first transceiver, operably coupled to the selectable encoder, for transmitting the packets of data to a receiving unit and for receiving error information from the receiving unit, at the receiving unit; D) a second transceiver, for receiving a plurality of received packets of data from the first transceiver and transmitting the error information from a channel decoder of the receiving unit to the first transceiver; E) the channel decoder, operably coupled to the second transceiver, for decoding the plurality of received packets of data and determining the error information wherein the following steps F-G are implemented; F) receiving a received packet of the plurality of received packets from the transmitting unit by the receiving unit; G) adjusting, by the receiving unit, the selectable encoder of the transmitting unit, wherein one of H-K; H) wherein: H1) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, the received packet; H2) determining by the channel decoder of the receiving unit, that at least a predetermined number of codewords of the received packet have errors; H3) sending a signal for resetting the selectable encoder of the transmitting unit from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a length of the received packet from a first predetermined packet length to a second predetermined packet length; H4) resetting the channel decoder of the receiving unit accordingly; I) wherein: 11 ) upon requesting, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of retransmissions; 12) receiving, by the channel decoder of the receiving unit, the same received packet having errors; 13) 2c sending, by the channel decoder of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the received packet from the first predetermined packet length to the second predetermined packet length; 14) resetting the channel decoder of the receiving unit accordingly; J) wherein: J1) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, the received packet of the plurality of received packets having a codeword with an error count greater than a predetermined threshold; J2) sending, by the channel decoder of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the received packet from the first predetermined packet length to the second predetermined packet length; J3) resetting the channel decoder of the receiving unit accordingly; K) wherein: K1) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of consecutive error-free packets; K2) sending, by the channel decoder of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the second predetermined channel coding rate to the first predetermined channel coding rate and changing the length of the received packet from the second predetermined packet length to the first predetermined packet length; K3) resetting the channel decoder of the receiving unit accordingly, wherein, for steps H-K the second predetermined channel coding rate is less than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length; F) and a data sink, operably coupled to the channel decoder, for receiving decoded received data.
2d Brief Descriptions of the Drawings FIG. 1 is a block diagram of a communication system that operates in accordance with the method of the present invention.
FIG. 2 illustrates the format of the efficient, long packet mode and the robust, short packet mode.
FIG. 3 is a flow chart of an embodiment of steps in accordance with the method of the present invention.
FIG. 4 is a flow chart showing a particular embodiment of the method of the present invention wherein the input packet is in the efficient, long packet mode.
FIG. 5 is a flow chart showing another embodiment of the method of the present invention wherein the input packet is in the robust, short packet mode.
Detailed Description of a Preferred Embodiment The present invention provides a method and a communication system having efficient and highly-reliable error-detection that automatically optimize data throughput of a channel whose error properties vary over time by selecting a length of a packet and a channel coding rate in a packet such that throughput is maximized during periods when relatively few errors are found in packets and data redundancy is increased to provide a more robust system during periods when the number of errors of three particular 216'~~45 types of errors exceeds three respective predetermined threshold levels.
FIG. 1, numeral 100, is a block diagram of a communication system that operates in accordance with the method of the present invention. The invention includes a communication system for maximizing channel efficiency in a data channel having varying transmission error conditions, wherein the communication system includes a transmitting unit (102) and a receiving unit (104), described more fully as follows. The transmitting unit (102) includes: a buffered data source (106), for providing data for transmitting; a selectable encoder (108), operably coupled to the buffered data source (106), for encoding the data into packets in accordance with a predetermined scheme using one of: an efficient channel encoder (110) and a robust channel encoder (112); a first transceiver (114), operably coupled to the selectable encoder (108), for transmitting the packets of data to the receiving unit (104) and for receiving error information from the receiving unit (104).
Buffered data source (106) provides a stream of data bits which may be grouped in information vectors U1, U2, ..., UL, where L is a first predetermined integer, and the channel encoder (110) typically maps the vectors into channel vectors V1, V2, ..., VL, or alternatively, buffered data source (106) provides a stream of data bits which may be grouped in information vectors u1, u2, ..., us, where s is a second predetermined integer, and the channel encoder (112) then typically maps the vectors into channel vectors v1, v2, ..., vs.
In the preferred embodiment, L is selected to be greater than s.
The receiving unit (104) includes: a second transceiver (116), for receiving the transmitted data from the first 216'~~4~
transceiver (114) and transmitting error information from a channel decoder (118) of the receiving unit (104); the channel -decoder (118), operably coupled to the second transceiver (116), for decoding the received data and determining the error information wherein at least one of a-d: a) upon receiving a packet and determining that at least a predetermined number of codewords of the packet have errors, sending a signal for resetting the selectable encoder (108) of the transmitting unit (102) from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a packet length from a first predetermined packet length to a second predetermined packet length and resetting the channel decoder (118) of the receiving unit (104) accordingly, b) upon requesting a predetermined number of retransmissions and receiving the same packet having errors, sending a signal for resetting the selectable encoder (108) of the transmitting unit (102) from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a packet length from a first predetermined packet length to a second predetermined packet length and resetting the channel decoder (118) of the receiving unit (104) accordingly, c) upon receiving a packet having a codeword with an error count greater than a predetermined threshold, sending a signal for resetting the selectable encoder (108) of the transmitting unit (102) from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a packet length from a first predetermined packet length to a second predetermined packet length and resetting the channel decoder (118) receiving unit (104) accordingly, and d) upon receiving a predetermined number of consecutive error-free packets, sending a signal for resetting the selectable encoder (108) of the transmitting unit (102) from a second predetermined channel coding rate to a first predetermined channel coding rate and changing a packet length from a second predetermined packet length to a first predetermined packet ~1~'~~4 length and resetting the channel decoder (118) of the receiving unit (104) accordingly; and a data sink (120), operably coupled ~o the channel decoder (118), for receiving decoded received data. For (a)-(d), the second predetermined channel coding rate 5 is less than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length.
Typically, for a 2.4 GHz propagation environment and a nominal one Megabit per second data transmission rate, the first predetermined channel coding rate is approximately 97 per cent and the second predetermined channel coding rate is approximately 70 per cent. For a 2.4 GHz propagation environment and a nominal one Megabit per second data transmission rate, the first predetermined packet length is generally in a range from 15 ms to 50 ms and the second predetermined packet length is in a range from 1 ms to 5 ms.
FIG. 2, numeral 200, illustrates the format of the efficient, long packet mode and the robust, short packet mode.
The diagram depicts allocation of time from the perspective of the selectable encoder (108) of the transmitting unit (102).
Transmitted packets include transmitter overhead time, TxOv, which is fixed and independent of packet length and channel coding rate. Also independent of packet length and channel coding rate are the time, ACK, for first transceiver (114) to receive acknowledgment from second transceiver (116). A
third time period, propagation time, is dependent on physical separation of transmitting unit (102) and receiving unit (104) but like TxOv and ACK independent of packet length and channel coding rate.
In the efficient, long-packet mode (202) packets include L equal-length codewords, V1 through VL, each of which is comprised of information data bits requiring' time, k1, to transmit and parity (redundancy) bits requiring time, p1, to transmit.
In the robust, short-packet mode (204) packets include s equal-length codewords, v1 through vs, each of which is comprised of information data bits requiring time, k2; to transmit and parity (redundancy) bits requiring time, p2, to transmit with second channel coding rate, k2/(k2+p2) less than first channel coding rate, k1/(k1+p1).
Typically, for a 2:4 GHz propagation environment and a nominal one Megabit per second data transmission rate, (TxOv + propagation time + ACK) is in the range of 150 microseconds to 400 microseconds, codeword lengths k1+p1 - k2+p2 =
1 5 1 millisecond, k1 - 970 microseconds, k2 = 700 microseconds; L = 15 to 50 codewords, and s = 1 to 5 codewords.
FIG. 3, numeral 300, is a flow chart of an embodiment of steps in accordance with the method of the present invention.
The method provides for maximizing channel efficiency in a data channel having varying transmission error conditions and includes the steps of at least one of a-d: a) upon receiving a packet and determining that at least a predetermined number of codewords of the packet have errors, sending a signal for resetting a transmitter from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a packet length from a first predetermined packet length to a second predetermined packet length and resetting the receiver accordingly (304); b) upon requesting a predetermined number of retransmissions and receiving the same packet having errors, sending a signal for resetting the transmitter from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a packet length from a first predetermined packet length to a 2167~~~
Typically, for a 2.4 GHz propagation environment and a nominal one Megabit per second data transmission rate, the first predetermined channel coding rate is approximately 97 per cent and the second predetermined channel coding rate is approximately 70 per cent. For a 2.4 GHz propagation environment and a nominal one Megabit per second data transmission rate, the first predetermined packet length is generally in a range from 15 ms to 50 ms and the second predetermined packet length is in a range from 1 ms to 5 ms.
FIG. 2, numeral 200, illustrates the format of the efficient, long packet mode and the robust, short packet mode.
The diagram depicts allocation of time from the perspective of the selectable encoder (108) of the transmitting unit (102).
Transmitted packets include transmitter overhead time, TxOv, which is fixed and independent of packet length and channel coding rate. Also independent of packet length and channel coding rate are the time, ACK, for first transceiver (114) to receive acknowledgment from second transceiver (116). A
third time period, propagation time, is dependent on physical separation of transmitting unit (102) and receiving unit (104) but like TxOv and ACK independent of packet length and channel coding rate.
In the efficient, long-packet mode (202) packets include L equal-length codewords, V1 through VL, each of which is comprised of information data bits requiring' time, k1, to transmit and parity (redundancy) bits requiring time, p1, to transmit.
In the robust, short-packet mode (204) packets include s equal-length codewords, v1 through vs, each of which is comprised of information data bits requiring time, k2; to transmit and parity (redundancy) bits requiring time, p2, to transmit with second channel coding rate, k2/(k2+p2) less than first channel coding rate, k1/(k1+p1).
Typically, for a 2:4 GHz propagation environment and a nominal one Megabit per second data transmission rate, (TxOv + propagation time + ACK) is in the range of 150 microseconds to 400 microseconds, codeword lengths k1+p1 - k2+p2 =
1 5 1 millisecond, k1 - 970 microseconds, k2 = 700 microseconds; L = 15 to 50 codewords, and s = 1 to 5 codewords.
FIG. 3, numeral 300, is a flow chart of an embodiment of steps in accordance with the method of the present invention.
The method provides for maximizing channel efficiency in a data channel having varying transmission error conditions and includes the steps of at least one of a-d: a) upon receiving a packet and determining that at least a predetermined number of codewords of the packet have errors, sending a signal for resetting a transmitter from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a packet length from a first predetermined packet length to a second predetermined packet length and resetting the receiver accordingly (304); b) upon requesting a predetermined number of retransmissions and receiving the same packet having errors, sending a signal for resetting the transmitter from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a packet length from a first predetermined packet length to a 2167~~~
second predetermined packet length and resetting the receiver accordingly (306); c) upon receiving a packet having a ~codeword with an error count greater than a predetermined threshold, sending a signal for resetting the transmitter from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a packet length from a first predetermined packet length to a second predetermined packet length and resetting the receiver accordingly (308); and d) upon receiving a predetermined number of consecutive error-free packets, sending a signal for resetting the transmitter from a second predetermined channel coding rate to a first predetermined channel coding rate and changing a packet length from a second predetermined packet length to a first predetermined packet length and resetting the receiver accordingly (310), wherein, for (a)-(d) the second predetermined channel coding rate is less than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length (302).
When the method of FIG. 3 is implemented in a 2.4 GHz propagation environment using a nominal one Megabit per second data transmission rate, the first predetermined channel coding rate is typically approximately 97 per cent and the second predetermined channel coding rate is approximately 70 per cent. When the method of FIG. 3 is implemented in a 2.4 GHz propagation environment using a nominal one Megabit per second data transmission rate, the first predetermined packet length is generally in a range from 15 ms to 50 ms and the second predetermined packet length is in a range from 1 ms to 5 ms.
FIG. 4, numeral 400, is a flow chart showing a particular embodiment of the method of the present invention wherein the communication system is in the efficient, long packet mode. The method is used for maximizing channel efficiency for transmitting packets in a data channel having varying rtransmission error conditions and includes, for a received packet in the efficient mode, the steps of: a) clearing a retransmission flag for the received packet (401 ); b) decoding next available codeword in the packet and determining an error count of the codeword (402); c) determining whether the error count is >_ 0 (404); d) where the error count is > 0 and where the error count is < the predetermined error threshold (406), incrementing the codeword error count by 1 and setting the retransmission flag (408), determining whether the codeword error count is >_ a predetermined codeword error threshold (409), and where the codeword error count is >_ the predetermined codeword error threshold, waiting for an end of the entire packet (410) and sending a message indicating that the packet failed and transitioning the receiver and a transmitter from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a packet length from a first predetermined packet length to a second predetermined packet length, wherein, for the second predetermined channel coding rate is lower than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length (412) and transitioning to a robust mode; e) where the error count is > 0 and where the error count is >_ the predetermined error threshold, waiting for an end of an entire packet (410) and sending a message indicating that the packet failed and transitioning the receiver and a transmitter from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a packet length from a first predetermined packet length to a second predetermined packet length, wherein, for the second predetermined channel coding rate is lower than the first predetermined channel coding rate and the second 216'945 predetermined packet length is less than the first predetermined packet length (412) and transitioning to a Tobust mode, and where the codeword error count is < the predetermined codeword error threshold, upon receiving the entire packet, setting a retransmission flag (414), and where one of: the error count is = 0 (determined in 404) and the retransmission flag is set (414), determining whether a last codeword of the packet has been received (416), and where an intermediate codeword of the packet has been received, recycling to decoding a next available codeword (402), and where a last codeword of the packet has been received, checking whether the retransmission flag is set (418), and where the retransmission flag has been set, incrementing a retransmission count (420), determining whether a retransmission count is _> a predetermined retransmission threshold (422), and where the predetermined retransmission count is ? the predetermined retransmission threshold, sending a message indicating that the packet failed and transitioning the receiver and a transmitter from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a packet length from a first predetermined packet length to a second predetermined packet length, wherein the second predetermined channel coding rate is less than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length (412) and transitioning to the robust mode, and where the predetermined retransmission count is < the predetermined retransmission threshold, sending the message indicating that the transmission failed and that the packet should be retransmitted, and where the retransmission flag is clear, resetting a transmission count, sending the message indicating that the transmission is successful (426) and recycling to clearing a retransmission 3 5 flag (401 ).
21~'~945 FIG. 5, numeral 500, is a flow chart showing another -embodiment of the method of the present invention wherein the input packet is in the robust, short packet mode. The 5 method provides for maximizing channel efficiency for transmitting packets in a data channel having varying transmission error conditions, comprising the steps of, for a received packet: a) clearing an error flag of the received packet (502); b) decoding a next available codeword of the 10 received packet (504); c) determining whether there are errors) in the codeword (506); d) where there is at least a first error in the codeword, setting the error flag (508) and determining whether the codeword is a last codeword of the packet (510); e) where the codeword is error-free, determining whether the codeword is a last codeword of the packet (510); f} where the codeword is an intermediate codeword of the packet, recycling to decoding a next codeword (504); g) where the codeword is a last codeword of the packet, checking whether the error flag is set (512); g) where the error flag is set, resetting an error-free count (514), sending the message indicating that the transmission failed and that the packet should be retransmitted (516, 524) and recycling to clearing the error flag (502); h) where the error flag is clear, incrementing the error-free count (518) and determining whether the error free count is >_ a predetermined threshold (520); i) where the error free count is < a predetermined threshold, sending the message indicating that the transmission is successful (522, 524) and recycling to clearing the error flag (502); j) where the error free count is a predetermined threshold, sending a message indicating that the packet is successful (526, 528) and transitioning the receiver and a transmitter from a second predetermined channel coding rate to a first predetermined channel coding rate and changing a packet length from a second predetermined packet length to a first predetermined packet length, wherein, for the first predetermined channel coding rate is greater than the second predetermined channel coding rate and the first -predetermined packet length is greater than the second predetermined packet length.
Although exemplary embodiments are described above, it will be obvious to those skilled in the art that many alterations and modifications may be made without departing from the invention. Accordingly, it is intended that all such alterations and modifications be included within the spirit and scope of the invention as defined in the appended claims.
We claim:
When the method of FIG. 3 is implemented in a 2.4 GHz propagation environment using a nominal one Megabit per second data transmission rate, the first predetermined channel coding rate is typically approximately 97 per cent and the second predetermined channel coding rate is approximately 70 per cent. When the method of FIG. 3 is implemented in a 2.4 GHz propagation environment using a nominal one Megabit per second data transmission rate, the first predetermined packet length is generally in a range from 15 ms to 50 ms and the second predetermined packet length is in a range from 1 ms to 5 ms.
FIG. 4, numeral 400, is a flow chart showing a particular embodiment of the method of the present invention wherein the communication system is in the efficient, long packet mode. The method is used for maximizing channel efficiency for transmitting packets in a data channel having varying rtransmission error conditions and includes, for a received packet in the efficient mode, the steps of: a) clearing a retransmission flag for the received packet (401 ); b) decoding next available codeword in the packet and determining an error count of the codeword (402); c) determining whether the error count is >_ 0 (404); d) where the error count is > 0 and where the error count is < the predetermined error threshold (406), incrementing the codeword error count by 1 and setting the retransmission flag (408), determining whether the codeword error count is >_ a predetermined codeword error threshold (409), and where the codeword error count is >_ the predetermined codeword error threshold, waiting for an end of the entire packet (410) and sending a message indicating that the packet failed and transitioning the receiver and a transmitter from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a packet length from a first predetermined packet length to a second predetermined packet length, wherein, for the second predetermined channel coding rate is lower than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length (412) and transitioning to a robust mode; e) where the error count is > 0 and where the error count is >_ the predetermined error threshold, waiting for an end of an entire packet (410) and sending a message indicating that the packet failed and transitioning the receiver and a transmitter from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a packet length from a first predetermined packet length to a second predetermined packet length, wherein, for the second predetermined channel coding rate is lower than the first predetermined channel coding rate and the second 216'945 predetermined packet length is less than the first predetermined packet length (412) and transitioning to a Tobust mode, and where the codeword error count is < the predetermined codeword error threshold, upon receiving the entire packet, setting a retransmission flag (414), and where one of: the error count is = 0 (determined in 404) and the retransmission flag is set (414), determining whether a last codeword of the packet has been received (416), and where an intermediate codeword of the packet has been received, recycling to decoding a next available codeword (402), and where a last codeword of the packet has been received, checking whether the retransmission flag is set (418), and where the retransmission flag has been set, incrementing a retransmission count (420), determining whether a retransmission count is _> a predetermined retransmission threshold (422), and where the predetermined retransmission count is ? the predetermined retransmission threshold, sending a message indicating that the packet failed and transitioning the receiver and a transmitter from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a packet length from a first predetermined packet length to a second predetermined packet length, wherein the second predetermined channel coding rate is less than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length (412) and transitioning to the robust mode, and where the predetermined retransmission count is < the predetermined retransmission threshold, sending the message indicating that the transmission failed and that the packet should be retransmitted, and where the retransmission flag is clear, resetting a transmission count, sending the message indicating that the transmission is successful (426) and recycling to clearing a retransmission 3 5 flag (401 ).
21~'~945 FIG. 5, numeral 500, is a flow chart showing another -embodiment of the method of the present invention wherein the input packet is in the robust, short packet mode. The 5 method provides for maximizing channel efficiency for transmitting packets in a data channel having varying transmission error conditions, comprising the steps of, for a received packet: a) clearing an error flag of the received packet (502); b) decoding a next available codeword of the 10 received packet (504); c) determining whether there are errors) in the codeword (506); d) where there is at least a first error in the codeword, setting the error flag (508) and determining whether the codeword is a last codeword of the packet (510); e) where the codeword is error-free, determining whether the codeword is a last codeword of the packet (510); f} where the codeword is an intermediate codeword of the packet, recycling to decoding a next codeword (504); g) where the codeword is a last codeword of the packet, checking whether the error flag is set (512); g) where the error flag is set, resetting an error-free count (514), sending the message indicating that the transmission failed and that the packet should be retransmitted (516, 524) and recycling to clearing the error flag (502); h) where the error flag is clear, incrementing the error-free count (518) and determining whether the error free count is >_ a predetermined threshold (520); i) where the error free count is < a predetermined threshold, sending the message indicating that the transmission is successful (522, 524) and recycling to clearing the error flag (502); j) where the error free count is a predetermined threshold, sending a message indicating that the packet is successful (526, 528) and transitioning the receiver and a transmitter from a second predetermined channel coding rate to a first predetermined channel coding rate and changing a packet length from a second predetermined packet length to a first predetermined packet length, wherein, for the first predetermined channel coding rate is greater than the second predetermined channel coding rate and the first -predetermined packet length is greater than the second predetermined packet length.
Although exemplary embodiments are described above, it will be obvious to those skilled in the art that many alterations and modifications may be made without departing from the invention. Accordingly, it is intended that all such alterations and modifications be included within the spirit and scope of the invention as defined in the appended claims.
We claim:
Claims (8)
1. A method for maximizing channel efficiency in a data channel having varying transmission error conditions, comprising the steps of:
A) receiving a packet from a transmitting unit by a receiving unit;
B) adjusting, by the receiving unit, a selectable encoder of the transmitting unit, wherein at least one of C-F:
C) upon receiving, by a channel decoder of the receiving unit from a first transceiver of the transmitting unit, the packet and determining, by the channel decoder of the receiving unit, that at least a predetermined number of codewords of the packet have errors, C1) sending, by a second transceiver of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a length of the packet from a first predetermined packet length to a second predetermined packet length and C2) resetting, by the second transceiver of the receiving unit, the channel decoder of the receiving unit accordingly, D) upon requesting, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of retransmissions and receiving, by the channel decoder of the receiving unit, the same packet having errors, D1) sending, by the channel decoder of the receiving unit utilizing the second transceiver of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the packet from the first predetermined packet length to the second predetermined packet length and D2) resetting, by the second transceiver of the receiving unit, the channel decoder of the receiving unit accordingly, E) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, the packet having a codeword of the predetermined number of codewords of the packet with an error count greater than a predetermined threshold, E1) sending, by the channel decoder of the receiving unit utilizing the second transceiver of the receiving unit, a signal for resetting the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the packet from the first predetermined packet length to the second predetermined packet length and E2) resetting, by the second transceiver of the receiving unit, the charnel decoder of the receiving unit accordingly, F) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of consecutive error-free packets, F1) sending, by the channel decoder of the receiving unit utilizing the second transceiver of the receiving unit, a signal for resetting the transmitting unit from the second predetermined channel coding rate to the first predetermined channel coding rate and changing the length of the packet from the second predetermined packet length to the first predetermined packet length and F2) resetting, by the second transceiver of the receiving unit, the channel decoder of the receiving unit accordingly, wherein, for steps C-F the second predetermined channel coding rate is less than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length.
A) receiving a packet from a transmitting unit by a receiving unit;
B) adjusting, by the receiving unit, a selectable encoder of the transmitting unit, wherein at least one of C-F:
C) upon receiving, by a channel decoder of the receiving unit from a first transceiver of the transmitting unit, the packet and determining, by the channel decoder of the receiving unit, that at least a predetermined number of codewords of the packet have errors, C1) sending, by a second transceiver of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a length of the packet from a first predetermined packet length to a second predetermined packet length and C2) resetting, by the second transceiver of the receiving unit, the channel decoder of the receiving unit accordingly, D) upon requesting, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of retransmissions and receiving, by the channel decoder of the receiving unit, the same packet having errors, D1) sending, by the channel decoder of the receiving unit utilizing the second transceiver of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the packet from the first predetermined packet length to the second predetermined packet length and D2) resetting, by the second transceiver of the receiving unit, the channel decoder of the receiving unit accordingly, E) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, the packet having a codeword of the predetermined number of codewords of the packet with an error count greater than a predetermined threshold, E1) sending, by the channel decoder of the receiving unit utilizing the second transceiver of the receiving unit, a signal for resetting the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the packet from the first predetermined packet length to the second predetermined packet length and E2) resetting, by the second transceiver of the receiving unit, the charnel decoder of the receiving unit accordingly, F) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of consecutive error-free packets, F1) sending, by the channel decoder of the receiving unit utilizing the second transceiver of the receiving unit, a signal for resetting the transmitting unit from the second predetermined channel coding rate to the first predetermined channel coding rate and changing the length of the packet from the second predetermined packet length to the first predetermined packet length and F2) resetting, by the second transceiver of the receiving unit, the channel decoder of the receiving unit accordingly, wherein, for steps C-F the second predetermined channel coding rate is less than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length.
2. The method of claim 1 wherein, for a 2.4 GHz propagation environment and a nominal one Megabit per second data transmission rate, the first predetermined channel coding rate is approximately 97 percent and the second predetermined channel coding rate is approximately 70 percent.
3. The method of claim 1 wherein, for a 2.4 GHz propagation environment and a nominal one Megabit per second data transmission rate, the first predetermined packet length is in a range from 15 ms to 50 ms and the second predetermined packet length is in a range from 1 ms to 5 ms.
4. - A method for maximizing channel efficiency for transmitting packets in a data channel having varying transmission error conditions, wherein an input packet is in an efficient, long packet mode, comprising the steps of:
for a received packet:
A) clearing a retransmission flag for the received packet, B) decoding a next available codeword in the received packet and determining an error count of the codeword, C) determining whether the error count is ~0, C1) where the error count is>0 and where the error count is ~a predetermined error threshold, waiting for an end of the received packet and sending a message indicating that the received packet failed and transitioning a receiving unit and a transmitting unit from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a length of the received packet from a first predetermined packet length to a second predetermined packet length, wherein, for the second predetermined channel coding rate is lower than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length, C2) where the error count is>0 and where the error count is <the predetermined error threshold, incrementing the codeword error count by 1 and setting the retransmission flag, C2b) determining whether the codeword error count is ~a predetermined codeword error threshold, - C2b1) where one of C2b1a-C2b1b:
C2b1a) where the codeword error count is~the predetermined codeword error threshold, upon receiving the received packet completely, sending a message indicating that the received packet failed and transitioning the receiving unit and the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the received packet from the first predetermined packet length to the second predetermined packet length, wherein, for the second predetermined channel coding rate is lower than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length, C2b1b) where the error count is < the predetermined codeword error threshold, waiting for the end of the received packet and sending a message indicating that the received packet failed and setting the retransmission flag;
D) where one of D1-D4:
D1) where the error count is=0, D2) where the retransmission flag is set (step C2b1b), determining whether the last codeword of the received packet has been received, D3) where an intermediate codeword of the received packet has been received, recycling to step B), D4) where the last codeword of the received packet has been received, checking whether the retransmission flag is set, - D4a) where the retransmission flag has been set, incrementing a retransmission count, D4b) determining whether the retransmission count is ~ a predetermined retransmission threshold, D4b1) where the retransmission count is ~ the predetermined retransmission threshold, sending a message indicating that the received packet failed and transitioning the receiving unit and the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the received packet from the first predetermined packet length to the second predetermined packet length, wherein the second predetermined channel coding rate is less than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length, D4b2) where the predetermined retransmission count is < the predetermined retransmission threshold, sending the message indicating that the trasmission failed and that the received packet should be retransmitted and recycling to step A), D4c) where the retransmission flag is clear, resetting the retransmission count, sending the message indicating that the transmission is successful and recycling to step A).
for a received packet:
A) clearing a retransmission flag for the received packet, B) decoding a next available codeword in the received packet and determining an error count of the codeword, C) determining whether the error count is ~0, C1) where the error count is>0 and where the error count is ~a predetermined error threshold, waiting for an end of the received packet and sending a message indicating that the received packet failed and transitioning a receiving unit and a transmitting unit from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a length of the received packet from a first predetermined packet length to a second predetermined packet length, wherein, for the second predetermined channel coding rate is lower than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length, C2) where the error count is>0 and where the error count is <the predetermined error threshold, incrementing the codeword error count by 1 and setting the retransmission flag, C2b) determining whether the codeword error count is ~a predetermined codeword error threshold, - C2b1) where one of C2b1a-C2b1b:
C2b1a) where the codeword error count is~the predetermined codeword error threshold, upon receiving the received packet completely, sending a message indicating that the received packet failed and transitioning the receiving unit and the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the received packet from the first predetermined packet length to the second predetermined packet length, wherein, for the second predetermined channel coding rate is lower than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length, C2b1b) where the error count is < the predetermined codeword error threshold, waiting for the end of the received packet and sending a message indicating that the received packet failed and setting the retransmission flag;
D) where one of D1-D4:
D1) where the error count is=0, D2) where the retransmission flag is set (step C2b1b), determining whether the last codeword of the received packet has been received, D3) where an intermediate codeword of the received packet has been received, recycling to step B), D4) where the last codeword of the received packet has been received, checking whether the retransmission flag is set, - D4a) where the retransmission flag has been set, incrementing a retransmission count, D4b) determining whether the retransmission count is ~ a predetermined retransmission threshold, D4b1) where the retransmission count is ~ the predetermined retransmission threshold, sending a message indicating that the received packet failed and transitioning the receiving unit and the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the received packet from the first predetermined packet length to the second predetermined packet length, wherein the second predetermined channel coding rate is less than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length, D4b2) where the predetermined retransmission count is < the predetermined retransmission threshold, sending the message indicating that the trasmission failed and that the received packet should be retransmitted and recycling to step A), D4c) where the retransmission flag is clear, resetting the retransmission count, sending the message indicating that the transmission is successful and recycling to step A).
5. A method for maximizing channel efficiency for transmitting packets in a data channel having varying transmission error conditions, wherein an input packet is in a robust, short packet mode, comprising the steps of:
for a received packet:
A) clearing an error flag of the received packet, B) decoding a next available codeword of the received packet, C) determining whether there are errors in the codeword, C1) where there is at least a first error in the codeword, setting the error flag and determining whether the codeword is the last codeword of the received packet, C2) where the codeword is error-free, determining whether the codeword is the last codeword of the received packet, D) where the codeword is an intermediate codeword of the received packet, recycling to step B), E) where the codeword is the last codeword of the received packet, checking whether the error flag is set, E1) where the error flag is set, resetting an error-free count, sending a message indicating that the transmission failed and that the received packet should be retransmitted and recycling to step A), E2) where the error flag is clear, incrementing the error-free count and determining whether the error-free count is z a predetermined codeword error threshold, E2a) where the error-free count is ~ the predetermined codeword error threshold, sending the message indicating that the transmission is successful and recycling to step ), E2b) where the error-free count is ~ predetermined codeword error threshold, sending the message indicating that the received packet is successful and transitioning a receiving unit and a transmitting unit from a second predetermined channel coding rate to a first predetermined channel coding rate and changing a length of the received packet from a second predetermined packet length to a first predetermined packet length, wherein, for the first predetermined channel coding rate is greater than the second predetermined channel coding rate and the first predetermined packet length is greater than the second predetermined packet length.
19~
for a received packet:
A) clearing an error flag of the received packet, B) decoding a next available codeword of the received packet, C) determining whether there are errors in the codeword, C1) where there is at least a first error in the codeword, setting the error flag and determining whether the codeword is the last codeword of the received packet, C2) where the codeword is error-free, determining whether the codeword is the last codeword of the received packet, D) where the codeword is an intermediate codeword of the received packet, recycling to step B), E) where the codeword is the last codeword of the received packet, checking whether the error flag is set, E1) where the error flag is set, resetting an error-free count, sending a message indicating that the transmission failed and that the received packet should be retransmitted and recycling to step A), E2) where the error flag is clear, incrementing the error-free count and determining whether the error-free count is z a predetermined codeword error threshold, E2a) where the error-free count is ~ the predetermined codeword error threshold, sending the message indicating that the transmission is successful and recycling to step ), E2b) where the error-free count is ~ predetermined codeword error threshold, sending the message indicating that the received packet is successful and transitioning a receiving unit and a transmitting unit from a second predetermined channel coding rate to a first predetermined channel coding rate and changing a length of the received packet from a second predetermined packet length to a first predetermined packet length, wherein, for the first predetermined channel coding rate is greater than the second predetermined channel coding rate and the first predetermined packet length is greater than the second predetermined packet length.
19~
6. A communication system for maximizing channel efficiency in a data channel having varying transmission error conditions, comprising:
at a transmitting unit:
A) a buffered data source, for providing data for transmitting, B) a selectable encoder, operably coupled to the buffered data source, for encoding the data into packets in accordance with a predetermined scheme using one of: an efficient channel encoder or a robust channel encoder, C) a first transceiver, operably coupled to the selectable encoder, for transmitting the packets of data to a receiving unit and for receiving error information from the receiving unit, at the receiving unit:
D) a second transceiver, for receiving a plurality of received packets of data from the first transceiver and transmitting the error information from a channel decoder of the receiving unit to the first transceiver, E) the channel decoder, operably coupled to the second transceiver, for decoding the plurality of received packets of data and determining the error information wherein the following steps F-G are implemented:
F) receiving a received packet of the plurality of received packets from the transmitting unit by the receiving unit; and G) adjusting, by the receiving unit, the selectable encoder of the transmitting unit, wherein one of H-K:
H) wherein:
H1) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, the received packet and H2) determining by the channel decoder of the receiving unit, that at least a predetermined number of codewords of the received packet have errors, H3) sending a signal for resetting the selectable encoder of the transmitting unit from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a length of the received packet from a first predetermined packet length to a second predetermined packet length and H4) resetting the channel decoder of the receiving unit accordingly, I) wherein:
I1) upon requesting, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of retransmissions and 12) receiving, by the channel decoder of the receiving unit, the same received packet having errors, 13) sending, by the channel decoder of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the received packet from the first predetermined packet length to the second predetermined packet length and 14) resetting the channel decoder of the receiving unit accordingly, J) wherein:
J1) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, the received packet of the plurality of received packets having a codeword with an error count greater than a predetermined threshold, J2) sending, by the channel decoder of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the received packet from the first predetermined packet length to the second predetermined packet length and J3) resetting the channel decoder of the receiving unit accordingly, K) wherein:
K1) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of consecutive error-free packets, K2) sending, by the channel decoder of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the second predetermined channel coding rate to the first predetermined channel coding rate and changing the length of the received packet from the second predetermined packet length to the first predetermined packet length and K3) resetting the channel decoder of the receiving unit accordingly, wherein, for steps H-K the second predetermined channel coding rate is less than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length, F) and a data sink, operably coupled to the channel decoder, for receiving decoded received data.
at a transmitting unit:
A) a buffered data source, for providing data for transmitting, B) a selectable encoder, operably coupled to the buffered data source, for encoding the data into packets in accordance with a predetermined scheme using one of: an efficient channel encoder or a robust channel encoder, C) a first transceiver, operably coupled to the selectable encoder, for transmitting the packets of data to a receiving unit and for receiving error information from the receiving unit, at the receiving unit:
D) a second transceiver, for receiving a plurality of received packets of data from the first transceiver and transmitting the error information from a channel decoder of the receiving unit to the first transceiver, E) the channel decoder, operably coupled to the second transceiver, for decoding the plurality of received packets of data and determining the error information wherein the following steps F-G are implemented:
F) receiving a received packet of the plurality of received packets from the transmitting unit by the receiving unit; and G) adjusting, by the receiving unit, the selectable encoder of the transmitting unit, wherein one of H-K:
H) wherein:
H1) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, the received packet and H2) determining by the channel decoder of the receiving unit, that at least a predetermined number of codewords of the received packet have errors, H3) sending a signal for resetting the selectable encoder of the transmitting unit from a first predetermined channel coding rate to a second predetermined channel coding rate and changing a length of the received packet from a first predetermined packet length to a second predetermined packet length and H4) resetting the channel decoder of the receiving unit accordingly, I) wherein:
I1) upon requesting, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of retransmissions and 12) receiving, by the channel decoder of the receiving unit, the same received packet having errors, 13) sending, by the channel decoder of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the received packet from the first predetermined packet length to the second predetermined packet length and 14) resetting the channel decoder of the receiving unit accordingly, J) wherein:
J1) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, the received packet of the plurality of received packets having a codeword with an error count greater than a predetermined threshold, J2) sending, by the channel decoder of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the first predetermined channel coding rate to the second predetermined channel coding rate and changing the length of the received packet from the first predetermined packet length to the second predetermined packet length and J3) resetting the channel decoder of the receiving unit accordingly, K) wherein:
K1) upon receiving, by the channel decoder of the receiving unit from the first transceiver of the transmitting unit, a predetermined number of consecutive error-free packets, K2) sending, by the channel decoder of the receiving unit, a signal for resetting the selectable encoder of the transmitting unit from the second predetermined channel coding rate to the first predetermined channel coding rate and changing the length of the received packet from the second predetermined packet length to the first predetermined packet length and K3) resetting the channel decoder of the receiving unit accordingly, wherein, for steps H-K the second predetermined channel coding rate is less than the first predetermined channel coding rate and the second predetermined packet length is less than the first predetermined packet length, F) and a data sink, operably coupled to the channel decoder, for receiving decoded received data.
7. The communication system of claim 6 wherein, for a 2.4 GHz propagation environment and a nominal one Megabit per second data transmission rate, the first predetermined channel coding rate is approximately 97 percent and the second predetermined channel coding rate is approximately 70 percent.
8. The communication system of claim 6 wherein, for a 2.4 GHz propagation environment and a nominal one Megabit per second data transmission rate, the first predetermined packet length is in a range from 15 ms to 50 ms and the second predetermined packet length is in a range from 1 ms to 5 ms.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/272,403 US5490168A (en) | 1994-07-08 | 1994-07-08 | Method and system for automatic optimization of data throughput using variable packet length and code parameters |
| US08/272,403 | 1994-07-08 | ||
| PCT/US1995/005646 WO1996002096A1 (en) | 1994-07-08 | 1995-05-08 | Method and system for automatic optimization of data throughput using variable packet length and code parameters |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2167945A1 CA2167945A1 (en) | 1996-01-25 |
| CA2167945C true CA2167945C (en) | 2001-01-23 |
Family
ID=23039647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002167945A Expired - Fee Related CA2167945C (en) | 1994-07-08 | 1995-05-08 | Method and system for automatic optimization of data throughput using variable packet length and code parameters |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5490168A (en) |
| EP (1) | EP0717893A4 (en) |
| CN (1) | CN1130452A (en) |
| AU (1) | AU676439B2 (en) |
| CA (1) | CA2167945C (en) |
| WO (1) | WO1996002096A1 (en) |
Families Citing this family (78)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2671821B2 (en) * | 1994-09-28 | 1997-11-05 | 日本電気株式会社 | Data transmission equipment |
| JP2842831B2 (en) * | 1996-03-27 | 1999-01-06 | 日本電気エンジニアリング株式会社 | Data packet transmission apparatus and method |
| DE19642258C1 (en) * | 1996-10-11 | 1998-03-26 | Becker Gmbh | Digital data transmission method e.g. for audio data |
| US6125172A (en) * | 1997-04-18 | 2000-09-26 | Lucent Technologies, Inc. | Apparatus and method for initiating a transaction having acoustic data receiver that filters human voice |
| FR2767245B1 (en) * | 1997-08-08 | 1999-10-15 | Matra Communication | DIGITAL RADIO COMMUNICATION STATION |
| US6920150B1 (en) * | 1997-09-30 | 2005-07-19 | Lucent Technologies Inc. | Adaptive communications transcoding and error control |
| US6381241B1 (en) * | 1997-09-30 | 2002-04-30 | Wireless Access | Duplicate message detection and mending of garbled messages |
| US6141784A (en) * | 1997-11-26 | 2000-10-31 | International Business Machines Corporation | Method and system in a data communications system for the retransmission of only an incorrectly transmitted portion of a data packet |
| US6009553A (en) * | 1997-12-15 | 1999-12-28 | The Whitaker Corporation | Adaptive error correction for a communications link |
| US6700881B1 (en) * | 1998-03-02 | 2004-03-02 | Samsung Electronics Co., Ltd. | Rate control device and method for CDMA communication system |
| US6370163B1 (en) | 1998-03-11 | 2002-04-09 | Siemens Information And Communications Network, Inc. | Apparatus and method for speech transport with adaptive packet size |
| US6389055B1 (en) * | 1998-03-30 | 2002-05-14 | Lucent Technologies, Inc. | Integrating digital data with perceptible signals |
| FR2779591B1 (en) * | 1998-06-03 | 2000-09-01 | Nortel Matra Cellular | TRANSMISSION OF PACKET CODES WITHOUT IDENTIFYING THE EMPLOYEE CODE |
| GB9817292D0 (en) * | 1998-08-07 | 1998-10-07 | Nokia Mobile Phones Ltd | Digital video coding |
| US7058027B1 (en) * | 1998-09-16 | 2006-06-06 | Scientific Research Corporation | Systems and methods for asynchronous transfer mode and internet protocol |
| US6279132B1 (en) | 1998-09-28 | 2001-08-21 | Trw Inc. | Concatenated error control method and system for a processing satellite uplink |
| US6625776B1 (en) | 1998-09-30 | 2003-09-23 | Northrop Grumman Corporation | Adaptive coding scheme for a processing communications satellite |
| US6480497B1 (en) | 1998-11-23 | 2002-11-12 | Ricochet Networks, Inc. | Method and apparatus for maximizing data throughput in a packet radio mesh network |
| GB2346303A (en) * | 1999-01-30 | 2000-08-02 | Motorola Ltd | Error protection in a communications system |
| US7142506B1 (en) * | 1999-02-02 | 2006-11-28 | Vocaltec Communications Ltd. | Method and apparatus for transmitting packets |
| US6782490B2 (en) | 1999-03-17 | 2004-08-24 | At&T Corp. | Network-based service for the repair of IP multicast sessions |
| US6721707B1 (en) * | 1999-05-14 | 2004-04-13 | Nortel Networks Limited | Method and apparatus for controlling the transition of an audio converter between two operative modes in the presence of link impairments in a data communication channel |
| US6314535B1 (en) * | 1999-05-18 | 2001-11-06 | Xircom Wireless, Inc. | Dynamic forward error correction |
| EP1054526A1 (en) * | 1999-05-18 | 2000-11-22 | Lucent Technologies Inc. | Method and apparatus for link adaptation in telecommunications networks |
| US6772126B1 (en) * | 1999-09-30 | 2004-08-03 | Motorola, Inc. | Method and apparatus for transferring low bit rate digital voice messages using incremental messages |
| US6970451B1 (en) * | 1999-10-12 | 2005-11-29 | At&T Corp. | Smart routers-simple optics: network architecture for IP over WDM |
| US6728259B1 (en) * | 1999-12-14 | 2004-04-27 | Nokia Corporation | Link adaptation algorithm for packet based radio system |
| US6505034B1 (en) * | 1999-12-20 | 2003-01-07 | Nokia Ip Inc. | Adaptive ARQ feedback bandwidth allocation |
| CA2397893C (en) * | 2000-01-20 | 2011-05-03 | Nortel Networks Limited | Hybrid arq schemes with soft combining in variable rate packet data applications |
| JP3589343B2 (en) * | 2000-01-25 | 2004-11-17 | 株式会社エヌ・ティ・ティ・ドコモ | Frame transmission method and frame transmission device |
| US6920110B2 (en) * | 2001-02-14 | 2005-07-19 | Microsoft Corporation | System and method for transferring data over a network |
| US7437428B1 (en) * | 2000-02-16 | 2008-10-14 | Microsoft Corporation | System and method for transferring data over a network |
| US6970440B1 (en) * | 2000-02-29 | 2005-11-29 | Texas Instruments Incorporated | Enhanced performance in frequency hopping wireless communications by combining frequency dwelling with data transmission adjustments |
| JP3516634B2 (en) * | 2000-05-30 | 2004-04-05 | 日本電気株式会社 | Circuit emulation device and multiplexing method in circuit emulation device |
| US7089289B1 (en) | 2000-07-18 | 2006-08-08 | International Business Machines Corporation | Mechanisms for efficient message passing with copy avoidance in a distributed system using advanced network devices |
| US6735620B1 (en) | 2000-07-18 | 2004-05-11 | International Business Machines Corporation | Efficient protocol for retransmit logic in reliable zero copy message transport |
| US6799200B1 (en) | 2000-07-18 | 2004-09-28 | International Business Machines Corporaiton | Mechanisms for efficient message passing with copy avoidance in a distributed system |
| KR100525384B1 (en) * | 2000-10-31 | 2005-11-02 | 엘지전자 주식회사 | Method for controlling packet retransmission in mobile communication system |
| DE60135430D1 (en) * | 2000-11-17 | 2008-10-02 | Lg Electronics Inc | Method for blind connection adaptation using acknowledgment messages in ARQ transmission system |
| US7221648B2 (en) * | 2000-11-29 | 2007-05-22 | Lucent Technologies Inc. | Rate adaptation in a wireless communication system |
| US7437654B2 (en) * | 2000-11-29 | 2008-10-14 | Lucent Technologies Inc. | Sub-packet adaptation in a wireless communication system |
| US6772388B2 (en) * | 2000-12-06 | 2004-08-03 | Motorola, Inc | Apparatus and method for providing optimal adaptive forward error correction in data communications |
| US20030031203A1 (en) * | 2001-01-05 | 2003-02-13 | Akito Fukui | Mobile communication system and radio communication method |
| JP3596477B2 (en) | 2001-02-28 | 2004-12-02 | 日本電気株式会社 | Mobile communication system and modulation / coding mode switching method used therefor |
| BR0205740A (en) * | 2001-07-12 | 2004-02-03 | Samsung Electronics Co Ltd | Reverse Transmission Apparatus and Method for Improving Transmission Quality in a Data Communication System |
| US6928603B1 (en) * | 2001-07-19 | 2005-08-09 | Adaptix, Inc. | System and method for interference mitigation using adaptive forward error correction in a wireless RF data transmission system |
| JP4342128B2 (en) * | 2001-09-18 | 2009-10-14 | 富士通株式会社 | Packet processor and packet processor system |
| US6697890B1 (en) * | 2001-12-27 | 2004-02-24 | Advanced Micro Devices, Inc. | I/O node for a computer system including an integrated I/O interface |
| CN1172549C (en) * | 2002-03-27 | 2004-10-20 | 大唐移动通信设备有限公司 | Method for transmitting high speed down stream packet switched data in intelligence antenna mobile communication system |
| AU2003259902A1 (en) | 2002-08-19 | 2004-03-03 | Arkados, Inc. | Method and system for maximizing data throughput rate in a power line communications system by modifying payload symbol length |
| DE10324470A1 (en) * | 2003-05-30 | 2005-03-10 | Deutsche Telekom Ag | Method and apparatus for controlling data connections in a data network having a plurality of data network nodes |
| US7814392B2 (en) * | 2003-06-20 | 2010-10-12 | Intel Corporation | System, apparatus and methods of dynamically determined error correction codes in communication systems |
| JP4482024B2 (en) * | 2004-02-27 | 2010-06-16 | テレフオンアクチーボラゲット エル エム エリクソン（パブル） | Resource utilization optimization in packet-switched networks. |
| EP2228936A1 (en) | 2004-03-03 | 2010-09-15 | Aware, Inc. | Adaptive fec coding in dsl systems according to measured impulse noise |
| US7376152B2 (en) * | 2004-03-30 | 2008-05-20 | Via Telecom Co., Ltd. | Method and/or architecture implemented in hardware for the adjustment of messages with indeterministic length |
| US7584397B2 (en) * | 2004-06-10 | 2009-09-01 | Interdigital Technology Corporation | Method and apparatus for dynamically adjusting data transmission parameters and controlling H-ARQ processes |
| JP2008510337A (en) * | 2004-08-12 | 2008-04-03 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Method for assigning data to at least one packet in an integrated circuit |
| US7512135B2 (en) * | 2004-12-10 | 2009-03-31 | International Business Machines Corporation | Method for transferring data among a logical layer, physical layer, and storage device |
| US7590777B2 (en) | 2004-12-10 | 2009-09-15 | International Business Machines Corporation | Transferring data between system and storage in a shared buffer |
| US8675631B2 (en) * | 2005-03-10 | 2014-03-18 | Qualcomm Incorporated | Method and system for achieving faster device operation by logical separation of control information |
| US8144824B2 (en) * | 2005-03-10 | 2012-03-27 | Qualcomm Incorporated | Trend influenced time tracking |
| US20100157833A1 (en) * | 2005-03-10 | 2010-06-24 | Qualcomm Incorporated | Methods and systems for improved timing acquisition for varying channel conditions |
| US20060221810A1 (en) * | 2005-03-10 | 2006-10-05 | Bojan Vrcelj | Fine timing acquisition |
| JP4445012B2 (en) * | 2005-03-25 | 2010-04-07 | 富士通株式会社 | Packet distribution bandwidth control method, distribution apparatus, and video distribution system |
| US7623607B2 (en) * | 2005-10-31 | 2009-11-24 | Qualcomm Incorporated | Methods and apparatus for determining timing in a wireless communication system |
| EP1791285A1 (en) * | 2005-11-29 | 2007-05-30 | Alcatel Lucent | Hybrid ARQ apparatus and corresponding method, wherein the FEC redundancy is adapted based on the number of retransmissions of a packet |
| US8948329B2 (en) * | 2005-12-15 | 2015-02-03 | Qualcomm Incorporated | Apparatus and methods for timing recovery in a wireless transceiver |
| US20070180349A1 (en) * | 2006-01-31 | 2007-08-02 | Jacobsen Eric A | Techniques for uequal error protection for layered protection applications |
| US8472448B2 (en) | 2006-07-21 | 2013-06-25 | Intel Corporation | Wireless adaptive packet control message apparatus, systems, and methods |
| CN101507164B (en) * | 2006-08-21 | 2012-10-10 | 艾利森电话股份有限公司 | Method and arrangement for adapting transmission of encoded media |
| US8230288B2 (en) * | 2006-10-18 | 2012-07-24 | Samsung Electronics Co., Ltd. | Data transmission apparatus and method for applying an appropriate coding rate |
| EP1936853B1 (en) * | 2006-12-20 | 2018-11-21 | Panasonic Intellectual Property Corporation of America | Avoidance of feedback collision in mobile communications |
| WO2009095842A1 (en) * | 2008-01-28 | 2009-08-06 | Nxp B.V. | Data communication device with acknowledge messages |
| EP2114030B1 (en) * | 2008-04-30 | 2020-09-16 | Google Technology Holdings LLC | Methods and devices for preemptively transmitting a signal in accordance with an MCS other than a network commanded MCS |
| US9001657B2 (en) * | 2012-06-25 | 2015-04-07 | Verizon Patent And Licensing Inc. | Mesh network node with multiple automatic repeat requesters |
| RU2669069C1 (en) * | 2018-02-02 | 2018-10-08 | Акционерное общество "Калужский научно-исследовательский институт телемеханических устройств" | Method of transmission of multilateral messages in complexes of data-transmission communication |
| US11882024B2 (en) * | 2018-06-18 | 2024-01-23 | Cisco Technology, Inc. | Application-aware links |
| CN114338843B (en) * | 2021-12-30 | 2024-04-02 | 咻享智能(深圳)有限公司 | Intelligent coding system of wireless communication protocol |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1235189A (en) * | 1985-01-14 | 1988-04-12 | Haruhiko Akiyama | Error correction encoding system |
| JPH0618358B2 (en) * | 1985-04-09 | 1994-03-09 | 沖電気工業株式会社 | Error control coding system |
| JPS6224739A (en) * | 1985-07-25 | 1987-02-02 | Oki Electric Ind Co Ltd | Error control coding system |
| US5150368A (en) * | 1990-04-10 | 1992-09-22 | Rolm Systems | Minimization of modem retransmissions |
-
1994
- 1994-07-08 US US08/272,403 patent/US5490168A/en not_active Expired - Lifetime
-
1995
- 1995-05-08 CA CA002167945A patent/CA2167945C/en not_active Expired - Fee Related
- 1995-05-08 EP EP95919012A patent/EP0717893A4/en not_active Withdrawn
- 1995-05-08 WO PCT/US1995/005646 patent/WO1996002096A1/en not_active Application Discontinuation
- 1995-05-08 AU AU24727/95A patent/AU676439B2/en not_active Ceased
- 1995-05-08 CN CN95190617A patent/CN1130452A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO1996002096A1 (en) | 1996-01-25 |
| EP0717893A1 (en) | 1996-06-26 |
| EP0717893A4 (en) | 1998-07-29 |
| CA2167945A1 (en) | 1996-01-25 |
| CN1130452A (en) | 1996-09-04 |
| AU676439B2 (en) | 1997-03-06 |
| AU2472795A (en) | 1996-02-09 |
| US5490168A (en) | 1996-02-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2167945C (en) | Method and system for automatic optimization of data throughput using variable packet length and code parameters | |
| EP1187386B1 (en) | Method for asynchronous incremental redundancy reception in a communication system | |
| US5946320A (en) | Method for transmitting packet data with hybrid FEC/ARG type II | |
| US6009553A (en) | Adaptive error correction for a communications link | |
| US4720829A (en) | Error control encoding system | |
| US6519731B1 (en) | Assuring sequence number availability in an adaptive hybrid-ARQ coding system | |
| EP1157497B1 (en) | Data retransmission method in a voice-over-data communication system | |
| CN1328867C (en) | Method of packet data transfer with hybrid ARQ | |
| AU760429B2 (en) | ARQ protocol with packet-based reliability level setting | |
| US6778501B1 (en) | Selective repeat ARQ with efficient utilization of bitmaps | |
| US7152196B2 (en) | Adaptive multi-mode HARQ system and method | |
| JP4242060B2 (en) | Method and configuration in a digital communication system | |
| EP1190520B1 (en) | System and method for implementing hybrid automatic repeat request using parity check combining | |
| US7734987B2 (en) | Communication method and system using two or more coding schemes | |
| US20020049068A1 (en) | Data retransmission apparatus and method in a mobile communication system employing HARQ technique | |
| US6557135B1 (en) | Cycling through entirety of error-indicating acknowledgment information | |
| US20020064167A1 (en) | Hybrid ARQ with parallel packet transmission | |
| KR20040023568A (en) | Forward error correction system and method for packet based communication systems | |
| CA2292496A1 (en) | Sequence numbering range extending method and system for selecting repeat transmission protocols | |
| CN115118396A (en) | Method, system and wireless receiver for data retransmission in wireless network | |
| US7746953B1 (en) | Method and apparatus for asynchronous incremental redundancy transmission in a communication system | |
| CA2367948A1 (en) | Selective repeat arq with efficient utilization of bitmaps | |
| JPH03178232A (en) | Automatic resending request method for defectively received message and device for performing method thereof | |
| KR100331884B1 (en) | Error correction method and apparatus for wireless asynchronous transfer mode communication system | |
| JPH0371739A (en) | Adaptive error controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |