CN102318413A - Method of exchanging messages between devices in a wireless network, and devices for the same - Google Patents
Method of exchanging messages between devices in a wireless network, and devices for the same Download PDFInfo
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- CN102318413A CN102318413A CN2010800080330A CN201080008033A CN102318413A CN 102318413 A CN102318413 A CN 102318413A CN 2010800080330 A CN2010800080330 A CN 2010800080330A CN 201080008033 A CN201080008033 A CN 201080008033A CN 102318413 A CN102318413 A CN 102318413A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/16—Deriving transmission power values from another channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
Abstract
A method of exchanging messages for link recommendation in a receiving device of a wireless network comprises receiving a first data packet from a transmitting device; and transmitting link recommendation information to the transmitting device, the link recommendation information including transmit power control (TPC) information for controlling transmission power to be used for a second data packet in the transmitting device.
Description
Technical field
The present invention relates to wireless communication system, and more specifically, relate to the method for the through-put power of the link adaptation transfer of data that is used for controlling wireless communication system, and the subscriber equipment that is used for this method.
Background technology
Recently, developed bluetooth and Wireless Personal Network (WPAN) technology, it forms wireless network in the limited place such as family or small company between the digital device of relative lesser amt, to allow at exchanged between equipment audio frequency or video data.WPAN can be used for the information exchange between the digital device of relative lesser amt near relatively distance, and the low-power that makes it possible to carry out between digital device is communicated by letter with low-cost.The IEEE 802.15.3 (the wireless medium access control (MAC) and physical layer (PHY) standard that are used for a high-rate wireless territory net (WPAN)) that passes through on June 12nd, 2003 defines the MAC layer of two-forty WPAN and the standard of physical layer (PHY).
Fig. 1 is the overview of the example of the wireless private Access Network of diagram (WPAN).
As shown in fig. 1, WVAN is a network configured between such as the personal device in the confined space of family, and it is through disposing directly the information exchange between allowing using under the situation that is not having seamless link at the network of communication between devices.With reference to figure 1, WPAN comprises two or more users equipment 11 to 15, and one of them is as telegon 11.Telegon 11 provides the basic timing of WPAN, and is used to control service quality (QoS) requirement.The example of subscriber equipment comprises computer, PDA, notebook, DTV, video camera, digital camera, printer, microphone, loud speaker, headphone, bar code reader, display and cell phone.All digital devices can be used as subscriber equipment.
WPAN is not by design in advance, but the self-organizing network that under the situation of the help that does not have centralized infrastructure, forms as required (being called hereinafter, " piconet ").With being described in more detail below the process that forms a piconet.When can be used as equipment at random that telegon operates when carrying out the function of telegon, piconet starts.With before existing piconet is related, perhaps begin before the new piconet, all equipment is carried out scanning.Scanning means that equipment is collected and the information of memory channel, and whether search exists existing piconet.The equipment that according to the upper strata and has been used to start piconet by order and under the piconet that forms before on the accidental channel situation about being associated is not forming new piconet.Select to have the channel of less interference through being based on data that scan period obtains, and come broadcast beacon, the device start piconet through selected channel.In this case, beacon means the information of timing allocation information, other equipment in piconet and the control information of broadcasting through telegon, with control and supervisor micro microgrid.
Fig. 2 is the view that is shown in the example of the superframe that uses in the piconet.Timing controlled in piconet is carried out based on superframe basically.With reference to figure 2, begin each superframe by means of the beacon that transmits from telegon.The contention access period is used to permission equipment and transmits order, perhaps transmits the asynchronous data based on competition.The channel time allocation period comprises management channel time block (MCTB) and channel time blocks (CTB).MCTB is the period that wherein control information can between telegon and equipment, perhaps transmit between equipment.CTB is that wherein asynchronous data or synchrodata can be between equipment and the telegons or the period of between other equipment, transmitting.For each superframe, confirm quantity, length and the position of CAP, MCTB and CTB through telegon, and send it to other equipment in the piconet through beacon.
When the random device in the piconet need be sent to telegon or other equipment with data, device request telegon branch was used in the channel resource of transfer of data, and telegon is given the equipment in the scope of available channel resources with channel resource allocation.If CAP is present in the superframe, and telegon is received in the transfer of data among the CAP, and then equipment can transmit the data of low capacity through CAP, and need be from the telegon allocated channel time.
If the amount of equipment in the piconet is less, then because be sufficient, so in the distribution of channel resource, do not have problems from the channel resource of the transfer of data of each equipment.Yet, if owing to the equipment of larger amt causes the deficiency of channel resource, if perhaps transmit such as the large-capacity data that moves picture; Then following problem can appear; That is, even other equipment have the data that will transmit, also not to other devices allocation channel resources.Thus, may not executive communication.
And; During the data communication that belongs between two of WVAN or the more equipment; Possibly depend on the state of equipment and make the communication quality deterioration, such as the obstacle that disturbs, distance or the variation of position and the interference that is caused by another neighbouring device between the equipment taking place at the obstacle that occurs between the equipment with communicating by letter.
In aspect this, studied having no and be used under the situation of problem carrying out the data method for communicating effectively constituting between the equipment of WVAN.
Summary of the invention
Technical problem
The example that is used for the method for the link adaptation between the equipment of wireless network comprises unequal error protection (UEP) method, wave beam searching method, HRP pattern and/or LRP mode adjusting method and transmission power control method.In the above-mentioned link adaptation method at least one can depend on that the state of equipment uses.Particularly, if the Strength Changes of the signal that receives, then equipment can be carried out link adaptation through transmission power control method.
According to general transmission power control method, receiving equipment is to the through-put power control request message of transfer equipment transmission MAC command type, and transfer equipment comes control transmission power in response to request message.At this moment, in order to transmit request message, the telegon that receiving equipment should be subordinated to wireless network receives the channel transmitted resource that is used for message.Because also not receiving the receiving equipment of the channel resource be used for transfer of data from telegon should be to the telegon transfer channel resource allocation request message that is used for through-put power control; And receive the channel resource that separates; So following problem will take place, that is, be difficult to control transmission power immediately.And, also following problem will take place, that is, receiving equipment only could be carried out the through-put power control request receive to the channel resource of constant volume from telegon after.
Therefore; The present invention is directed to a kind of method that is used for being used for the message of through-put power control in the exchanged between equipment of wireless network; And the equipment that is used for this method, it has eliminated one or more problem that causes owing to the restriction of correlation technique and shortcoming basically.
Technical solution
One object of the present invention is to provide a kind of method that exchanges messages, and wherein, receiving equipment can ask transfer equipment to carry out through-put power control immediately according to the signal strength signal intensity that receives under the situation that does not have telegon to disturb.
Additional advantage of the present invention, purpose and characteristic will partly be set forth in the description of back; And part will become obviously for those of ordinary skill in the art after hereinafter is checked, perhaps can learn from enforcement of the present invention.Objects and advantages of the present invention can obtain through the structure that in written description and claim and appended accompanying drawing, particularly points out and realize.
In order to realize these purposes and other advantages; And according to the object of the invention; As implement and extensively describe ground at this, a kind of method that is used for being used in the exchange of the receiving equipment place of wireless network the message of link recommendation comprises: reception first packet from transfer equipment; And to transfer equipment transmission link recommendation information, wherein, said link recommendation information comprises through-put power control (TPC) information, and it is used for controlling the through-put power of the transmission of second packet that will be used for transfer equipment.
Further comprise according to the method for the invention: from transfer equipment, receive link recommendation request information, wherein, said link recommendation request information is to be used for request link to recommend.
Link recommendation request information is included in the MAC extended head of second packet that receives from transfer equipment.
Link recommendation information is included in the ACK grouping that transmits in response to second packet.Preferably, link recommendation information is included in the MAC extended head of ACK grouping.
The MAC extended head comprises: the expansion control field, and said expansion control field comprises control information; Type field, the type of data that said type field indication comprises in the son that constitutes the MAC grouping divides into groups; Low-rate physical (LRP) antenna direction is followed the tracks of (ADT) feedback fields, and said LRP ADT feedback fields comprises the ADT feedback information, is used for the transmission mode of between the signal transmission period of LRP unidirectional mode acquisition in future, optimizing; ACK group field, said ACK group field comprise the information whether the son grouping before the indication exists; And at least one clock field, said at least one clock field comprises the clock count information of video data or voice data.
The expansion control field comprises: link mode field, the type of said link mode field indication link recommendation; Two-forty physics (HRP) pattern field, the HRP pattern of the recommendation that said HRP pattern field indication will be used at the transfer equipment place; The LRP pattern field, the LRP pattern of the recommendation that said LRP pattern field indication will be used at the transfer equipment place; And the TPC field, said TPC field comprises TPC information.
In link mode field indication " not just in the request link recommendation ", " link recommendation request " and " link recommendation response " any one.
According to the present invention, under the situation from the request that is used for link recommendation information of transfer equipment not, link recommendation information is sent to transfer equipment.And link recommendation information is included in the ACK grouping that is transmitted in response to second packet that receives from transfer equipment.
Link recommendation information is confirmed based on the result of the channel status assessment of the channel that receives first packet.
According to the present invention, TPC information comprises that indication is used for being controlled at the value of recommendation of the through-put power of transfer equipment.
The value that indication is recommended has been indicated the through-put power of recommending not have variation.On the other hand, said value indication is recommended through-put power is increased scheduled volume.On the other hand, said value indication is recommended through-put power is reduced scheduled volume.
According to the present invention, confirm through-put power control (TPC) information according to receiving intensity.
In another aspect of this invention, the receiving equipment in wireless network comprises: delivery module; Receiver module, said receiver module receives first packet from delivery module; And control module; Said control module generates link recommendation information; And the control delivery module is to transmit the link recommendation information to transfer equipment, wherein; Said link recommendation information comprises through-put power control (TPC) information, is used in the transmission of transfer equipment, the through-put power that will use being controlled.
In according to another aspect of the invention, a kind of method of exchanging messages at the transfer equipment place of wireless network of being used for comprises: transmit first packet to receiving equipment; And from receiving equipment, receive link recommendation information, wherein, link recommendation information comprises through-put power control (TPC) information, is used for the through-put power that will be used to transmit is controlled.
In according to another aspect of the invention, the transfer equipment in wireless network comprises: receiver module; Delivery module, said delivery module transmits first packet to receiving equipment; And control module; Said control module receives link recommendation information; Said link recommendation information comprises through-put power control (TPC) information, will be used for through the through-put power of receiver module from the transmission of receiving equipment to be used to control, and come control transmission power according to TPC information.
Previous embodiment only is the part in the preferred embodiments of the present invention; And based on detailed description of the present invention; Those of ordinary skill in the art can design and understand the various embodiment that reflected technical characterictic of the present invention, and this will describe hereinafter.
Advantageous effects
According to embodiments of the invention, even under the situation for the allocation request of channel resources of the separation of telegon not, the WVAN receiving equipment can transmit the through-put power control request message that is used for link adaptation to transfer equipment through ack/nack signal.
Therefore, equipment can be carried out the control of instantaneous transmission power based on the variation of the signal strength signal intensity that receives that changes according to its state.And, through-put power can be through the link adaptation method between the equipment Be Controlled, said equipment transmits and receives signal under the situation of the interference that does not have telegon.
Should be appreciated that aforesaid general description of the present invention and following detailed description all are exemplary and illustrative, and aim to provide of the present invention further explanation as requiring to protect.
Description of drawings
Accompanying drawing is included to be provided further understanding of the present invention, and is incorporated among the application and constitutes the application's a part, and accompanying drawing illustrates embodiments of the invention (a plurality of), and it is used to explain principle of the present invention with describing.In the accompanying drawings:
Fig. 1 is the view of the example of diagram WPAN;
Fig. 2 is the view that is shown in the example of the superframe that uses in the piconet;
Fig. 3 is the view of the example of diagram WVAN;
Fig. 4 is the view that is shown in the frequency band of the HRP channel that uses among the WVAN and LRP channel;
Fig. 5 is the view of example that is shown in the structure of the superframe that uses among the WVAN;
Fig. 6 is the view of another example that is shown in the structure of the superframe that uses among the WVAN;
Fig. 7 is the view that is shown in the protocol layer architecture that realizes in the equipment of WVAN;
Fig. 8 illustrates according to an embodiment of the invention, is used for adapting to the flow chart in the procedural example of the particular link of WVAN equipment;
Fig. 9 illustrates according to an embodiment of the invention, the flow chart of the link assessment in WVAN equipment and the example of link recommendation;
Figure 10 illustrates according to an embodiment of the invention, is used to carry out the transmission of the wave beam searching disposal between WVAN equipment and receives the flow chart of the procedural example of signal;
Figure 11 A to Figure 11 E illustrates according to an embodiment of the invention, through the state of WVAN equipment deterioration the view of example of communications status;
Figure 12 illustrates according to an embodiment of the invention, between WVAN equipment, carries out the flow chart of the procedural example of link recommendation;
Figure 13 illustrates according to an embodiment of the invention, the view of another example of the link recommendation in WVAN equipment;
Figure 14 illustrates according to an embodiment of the invention, is used for the view in the link recommendation procedural example of the through-put power control of the link adaptation of WVAN equipment;
Figure 15 illustrates according to an embodiment of the invention, is used for the view in another example of the link recommendation process of the through-put power control of the link adaptation of WVAN equipment;
Figure 16 illustrates according to an embodiment of the invention, the view of the example of the MAC header format that transmits from WVAN equipment;
Figure 17 illustrates according to an embodiment of the invention, the view of the example of the MAC extended head form that transmits from WVAN equipment;
Figure 18 illustrates according to an embodiment of the invention, is used for the view in other examples of the link recommendation process of the through-put power control of the link adaptation of WVAN equipment;
Figure 19 illustrates according to an embodiment of the invention, comprises the view of example of the data format of the probe request message that transmits from the WVAN transfer equipment;
Figure 20 illustrates according to an embodiment of the invention, comprises the view of example of the data format of the probe response message that transmits from WVAN equipment; And
Figure 21 illustrates according to an embodiment of the invention, comprises the view of example of the broadcast signal process system of WVAN equipment.
Embodiment
In detail with reference to the preferred embodiments of the present invention, the example of said preferred embodiment is illustrated in the appended accompanying drawing now.As long as maybe, then in whole accompanying drawing, identical Reference numeral will be used to indicate identical or similar parts.
Hereinafter, will easily understand structure of the present invention, operation and other characteristics through the preferred embodiments of the present invention, the example of preferred embodiment is illustrated in the appended accompanying drawing.The embodiment that below describes is applied to the example as the wireless video LAN (WVAN) of a kind of WPAN with technical characterictic of the present invention.
Fig. 3 is the view of the example of diagram WVAN.With with identical mode shown in Figure 1, the WVAN of Fig. 3 comprises two or more users equipment 22 to 25, one of them serves as telegon 21.Telegon 21 provides the basis timing of WVAN, keeps the track of the equipment that belongs to WVAN, and is used to control service quality (QoS) requirement.Telegon is carried out its function and is used as an equipment that belongs to WVAN simultaneously.Can begin stream with telegon 21 other different equipment 22 to 25 connects.
The WVAN that a difference between the WVAN shown in the WVAN shown in Fig. 3 and Fig. 1 is Fig. 3 supports two kinds of physics (PHY) layer.That is, WVAN supports following physical layer, that is, and and two-forty physics (HRP) layer and low-rate physical (LRP) layer.The HRP layer is to support the perhaps physical layer of bigger message transmission rate of 1Gb/s, and the LRP layer is a physical layer of supporting the message transmission rate of several Mb/s.The HRP layer is a high directionality, and the synchronous data flow, asynchronous data, the MAC that are used to connect through clean culture order and the transmission of A/V control data.The LRP layer is supported directed or omnidirectional mode, and the transmission of the beacon that is used for carrying out through clean culture or broadcasting, asynchronous data, MAC order.Telegon 21 can use HRP and/or other equipment of LRP course to transmit perhaps from other equipment receiving datas.Other equipment 22 to 25 of WVAN can also use HRP and/or LRP layer to transmit or receive data.
Fig. 4 is the view that is shown in the frequency band of the HRP channel that uses among the WVAN and LRP channel.The HRP layer uses four channels of the bandwidth of the 2.0GHz in 57 to 66GHz frequency band, and the LRP layer uses three channels of the bandwidth of 92MHz.As shown in Figure 4, HRP channel and LRP Channel Sharing frequency band, and used by the TDMA pattern respectively.
Fig. 5 is the view of example that is shown in the structure of the superframe that uses among the WVAN.With reference to figure 5, each superframe comprises: beacon region, and wherein, beacon is transmitted; Reserve area, said reserve area is assigned to random device according to the request of equipment through telegon; And reserve area not, said not reserve area is not assigned with through telegon, but between telegon and equipment or between equipment, transmits and receive data according to the pattern based on competition, and wherein, each zone all is the time-division.Beacon comprises the timing allocation information in the respective superframe, and the management of WVAN and control information.Reserve area is used to data from according to the channel time allocation request of equipment and be sent to other equipment through the equipment of telegon to its allocated channel time.Can transmit order, data flow, asynchronous data etc. through reserve area.If through keeping all the other, specific equipment is sent to other equipment with data, then uses the HRP channel.If the equipment that receives data transmits the ack/nack signal of received data, then use the LRP channel.Reserve area can not be used between telegon and equipment, perhaps communicating control information, MAC order or asynchronous data between equipment.In order to prevent the data collision between the equipment in the reserve area not, then can use the multiple access of carrier wave induction (CSMA) pattern or the Aloha pattern of slotting.In reserve area not, can only transmit data through the LRP channel.If have transferred various control information or order, then reserve area can be set in the LRP channel.In each superframe, reserve area and not the length and the quantity of reserve area can change along with each superframe, and can control by telegon.
Fig. 6 is the view of another example that is shown in the structure of the superframe that uses among the WVAN.With reference to figure 6, each superframe comprises: beacon field 30, wherein transmit beacon; Keep channel time blocks 32; And do not keep channel time blocks 31.Each channel time blocks (CTB) by the time be divided into HRP zone and LRP zone, wherein, transmit data, and through LRP course LRP zone transmission data through HRP course HRP zone.Transmit beacon 30 termly through telegon, discerning the beginning part of each superframe, and beacon 30 comprises management and the control information of WVAN, and the timing information of scheduling.Equipment can come swap data in network through timing information and the management/control information that in beacon, comprises.
In the HRP zone, the CTB field of reservation can be used for data from according to the channel time allocation request of equipment and be sent to other equipment through the equipment of telegon to its allocated channel time.If specific equipment then uses the HRP channel to other equipment transmission datas through the CTB field that keeps.If the equipment that receives data transmits the ack/nack signal of received data, then use the LRP channel.
Do not keep the CTB field and can be used to communicating control information, MAC order, or the asynchronous data between telegon and equipment or between equipment.In order to prevent the data collision between the equipment in not keeping the CTB field, then can use the multiple access of carrier wave induction (CSMA) pattern or the Aloha pattern of slotting.If have transferred various control information or order, then can reserve area be arranged in the LRP channel.In each superframe, the length and the quantity that keep the CTB field and do not keep the CTB field can change along with each superframe, and can be controlled by telegon.
In addition, though in Fig. 6, do not illustrate, each superframe comprises position and the contiguous control period (CBCP) based on competition of beacon, to transmit urgent control/administrative messag.The length of CBCP can be set to be no more than given threshold value mMAXCBCPLen.
Fig. 7 is the view that is shown in the protocol layer architecture that realizes in the equipment of WVAN.
With reference to figure 7, the communication module of each equipment that in WVAN, comprises can comprise four layers according to its function.Usually, communication module comprises adaptive sublayer 40, MAC layer 41, PHY layer 42 and station administration entity (SME) layer 43.Under this kind situation, the station is the equipment that is used to discern telegon, and station administration entity (SME) means equipment management entity (DME).Station administration entity (SME) is the layer independent community of control lower floor, and from the state information of each layer collecting device.Station administration entity SME comprises the entity of each layer of supervisory communications module.Under this kind situation, the entity of managing MAC layer will be called as MAC layer management entity (MLME), and the entity of management adaptation layer will be called as adaptation layer management entity (ALME).
MAC layer 41 is used for the link setting, connect or disconnected and insert for the channel of the lower floor of transmission of materials agreement, and is used for reliable transfer of data.In other words, MAC layer 41 is used for transmitting control/data-message, perhaps is used for control channel.
The layer of equipment provides service, such as high rate services, Low rate services and management service.High rate services is used to video, audio frequency and transfer of data.And Low rate services is used to the transmission of the asynchronous data of voice data, MAC order and low capacity.Before carrying out the processing of exchanges data between the corresponding layer, corresponding layer transmits and receives simple message each other.The message that between such different layers, exchanges is called as primitive.
If have the WVAN of aforementioned characteristic when starting, the telegon that belongs to this WVAN is selected specific channel, and the two or more equipment that belong to this WVAN use radio link to transmit and receive the A/V data through corresponding channel.In order to select to be used between transfer equipment that belongs to this WVAN and receiving equipment, carrying out the physical layer of the optimization of transfer of data and reception, transfer equipment and receiving equipment are carried out link assessment and link adaptation.Link can mean channel, perhaps can be similar to channel.The link assessment is used as the implication identical with channel estimating.For link adaptation, transfer equipment is carried out link recommendation after carrying out the link assessment.
Simultaneously, transfer equipment is to transmit to another equipment the equipment of A/V data through the channel resource that distributes from telegon, and can be used to refer to the transfer equipment for the transmission and the reception of signal.Receiving equipment is the equipment of A/V data that receives from transfer equipment, and can be used to refer to the receiving equipment for the transmission and the reception of signal.
To briefly be described in the process of carrying out link adaptation between the WVAN equipment with reference to figure 8.
Fig. 8 is that diagram is according to an embodiment of the invention, is used for carrying out at WVAN equipment the flow chart of the procedural example of link adaptation.
With reference to figure 8, the WVAN transfer equipment transmits link assessment request message (S10) to the receiving equipment that transmits and receive the A/V data.Link assessment request message wants requesting service to carry out the assessment to the current channel condition in the service.Receiving equipment is assessed (S11) in response to link assessment request message to the state of the current channel in the service.When receiving at least one grouping, measure such forms such as packet error probability/ratio (PER), signal to noise ratio (snr) with receiving equipment and carry out channel estimating.Receiving equipment transmits the link recommendation information to transfer equipment, and wherein, link recommendation information comprises the information of obtaining through channel estimating (S12).If there is link recommendation request from transfer equipment, then can transmit the link recommendation information, perhaps even having no under the situation of link recommendation request, also can transmit the link recommendation information.
The transfer equipment that has received link recommendation information confirms to be used to carry out the link adaptation method (S13) of link adaptation.The example of link adaptation method comprises unequal error protection (UEP) method, wave beam search method, HRP pattern and/or LRP pattern (hereinafter, being called " HRP/LRP pattern ") method of adjustment, and transmission power control method.Transfer equipment uses in the above method at least one to carry out link adaptation (S14) according to its state.
Each step will briefly be described hereinafter.
Fig. 9 is that diagram is according to an embodiment of the invention, the flow chart of the link assessment in WVAN equipment and the example of link recommendation.Usually, the link assessment can be used to assess the quality of channel of being used by equipment.
With reference to figure 9, transfer equipment uses accidental channel to transmit packet to receiving equipment, and (S20), and for transfer equipment is made response, receiving equipment will transmit the step (S21) of ACK grouping and carry out once at least.At this moment, receiving equipment can be collected in the information of the channel status that uses among step S20 and the S21, or the information of signal quality.If the channel estimating request message is from transfer equipment transmission (S22), then receiving equipment is carried out channel estimating (S23) based on the information of signal quality or channel status.Because wireless network uses HRP channel and LRP channel,, receiving equipment assesses so carrying out at least one the link that is used for HRP channel and LRP channel.
Specifically, can be through carrying out link assessment (or channel estimating) with energy level, noise level or interference level on the time interval measurement channel that receives packet from transfer equipment.Yet the parameter that can assess channel status is not limited to above parameter, and the FER of during Data Receiving, measuring (FER), and error rate (BER) or the like can be used as the parameter that can assess channel status.
Receiving equipment generates link recommendation information based on the information of measured channel status (or signal quality), and then the link recommendation information that is generated is sent to transfer equipment (S24).Link recommendation information can comprise the information of the channel status of being measured by receiving equipment.
As stated, during link recommendation step (S24), transfer equipment receives link recommendation information, and this link recommendation information comprises the information of information that is used for signal channel transmitted state and the PHY pattern that will recommend.
The present invention relates to a kind of through in link recommendation information, comprising through-put power control (TPC) information, and the link adaptation method of the transfer equipment that carries out through through-put power control.The link recommendation process will be described with reference to Figure 12.
Next, transfer equipment can be carried out link adaptation, with the parameter of adjustment physical layer, thereby obtains better service quality (QoS) or higher throughput.
As stated, the example of link adaptation method comprises unequal error protection (UEP) method, wave beam searching method, HRP pattern and/or LRP pattern (being called hereinafter, " HRP/LRP pattern ") method of adjustment and transmission power control method.For link adaptation, the WVAN transfer equipment is as shown in Figure 8 from receiving equipment receive channel appreciation information and link recommendation information, and uses at least a in the link adaptation method based on channel estimating information and link recommendation information.Link recommendation information comprises the required information of link adaptation method of using.
Hereinafter, each link adaptation method will briefly be described.
According to unequal error protection (UEP) method, when during unpressed video Data Transmission, error of transmission taking place, unequal loss protection is applied on the bit with different level of significance, to carry out fast quick-recovery.And, through asymmetric layout, unequal loss protection is applied on the bit with different level of significance, the bit that has high importance with protection better, thus recover error of transmission.Specifically, can shine upon through asymmetric coding or asymmetric layout that application is used for the wireless radio transmission of unpressed video data and carry out UEP.
According to the wave beam searching method, have transfer equipment and one or more antenna sets of receiving equipment selection that a wave beam forms antenna sets at least, before using wave beam formation, to be used for signal transmission and the reception between the equipment.In multiple-input and multiple-output (MIMO) system that uses a plurality of antennas, WVAN equipment can use the phasing signal that is used for specific objective, that is, wave beam is with the maximization signal to noise ratio.Wave beam formation is one type smart antenna and device, wherein, uses a plurality of antennas that phasing signal is sent to specific objective, to raise the efficiency.Hereinafter, will come the concise and to the point wave beam searching method of describing with reference to Figure 10.
Figure 10 is that diagram is according to an embodiment of the invention, between WVAN equipment, transmits and receive the flow chart of signal with the procedural example of execution wave beam searching disposal.The wave beam search not necessarily need be carried out during initial communication, but can carry out in communication period as required.And the wave beam search is included in the HRP channel and wave beam forms the wave beam search in the LRP channel.
With reference to Figure 10, the WVAN transfer equipment transmits training signal (S30) to receiving equipment through each antenna sets.Receiving equipment is carried out channel estimating and input (S31) through training signal.The feedback information that receiving equipment will obtain through the result of channel estimating and input is sent to transfer equipment (S32).At this moment, preferably, the training signal that transmits from a plurality of beam antenna groups of transfer equipment is sequentially transmitted, as shown in Figure 10.In other words, after having transmitted first training signal, form antenna sets through second wave beam and transmit second training signal, and then, form antenna sets by suitable order from other wave beams and transmit training signal through first wave beam formation antenna sets.Further preferably, according to the training signal that transmits from transfer equipment, come to carry out the step that feedback information is sent to transfer equipment from receiving equipment by suitable order.
As stated, training signal and feedback information thereof can be repeated, detect to be used for each the throughput that a plurality of wave beams form antenna sets, and simultaneously can be with its repeated several times, with the order (S33, S34, S35) of measured channel matrix H.After having repeated step S33 to S35, transfer equipment confirms that through feedback information one or more wave beam that will use forms antenna sets (S36).Transfer equipment can be based on detected result and in the middle of the wave beam with predetermined reference value or bigger throughput forms antenna sets, select the antenna sets optimized.And the feedback information that transmits from receiving equipment can comprise the strength information of the signal that receives as the result of the input among step S21 or S24.
Therefore, the wave beam that transfer equipment can be selected to use forms antenna sets, and confirms to be applied to the aerial array weight vectors (AWV) that selected wave beam forms antenna sets.Be based on transfer equipment and the indication of the signal strength signal intensity that receives between the receiving equipment (RSSI) information of carrying out wave beam formation and confirm AWV.
At this moment, the training signal that transmits from transfer equipment is the signal that obtains through the predetermined training sequence of between transfer equipment and receiving equipment, sharing, and according to circumstances it can comprise the identification information of transfer equipment.
If through the wave beam search current antenna sets is changed to another antenna sets, then carries out beam steering (steering).Beam steering means that the antenna sets that is used to transmit and receive signal through change changes the direction of the main lobe (loab) of beam pattern, wherein, in main lobe, transmits and receives radio signals.Carry out beam steering with position that changes antenna in the radio communication or the such mode of phase place that changes radio signal.
The wave beam searching method is the example to the adaptive method of new link, and the training signal in Figure 10 and feedback information thereof are corresponding to link recommendation request message among Fig. 9 and link recommendation information.
If owing to the obstacle that between WVAN transfer equipment that transmits and receive radio signals and WVAN receiving equipment, exists causes having taken place garble; If perhaps radio signal departs from the master pattern that transmits radio signal, then can use beam steering through the wave beam search.
The HRP/LRP mode adjustment means the PHY mode adjustment by the channel of current transmission and WVAN transfer equipment that receives radio signals and the use of WVAN receiving equipment.If owing to the obstacle that between the equipment that transmits and receive radio signals, exists causes having taken place garble, if, then can use the PHY mode adjustment perhaps because the increase of the equipment of use same channel has caused the jamming rate increase.Therefore; During link recommendation; Transfer equipment is to the recommendation information of receiving equipment request HRP pattern and LRP pattern, changing the PHY pattern of current channel, and carries out link adaptation the PHY pattern is changed into the HRP pattern and the such mode of LRP pattern of recommending through receiving equipment.
According to transmission power control method, the WVAN Equipment Control through-put power of current transmission radio signal is to reduce power consumption and to keep reliable transmission state.For example, longer if the physical distance between equipment becomes, then RSSI may die down.If this physical distance becomes shorter, then RSSI increases, but power consumption possibly take place.
Therefore, the transfer equipment that transmits signal can increase or reduce through-put power, with corresponding to through-put power control report (TPC) information element (TPC reports IE) or the TPC request command that transmit from receiving equipment.Alternatively, receiving equipment can transmit through-put power control request message to transfer equipment with one type MAC order.In this case, receiving equipment should be asked the WVAN telegon of channel resource, to transmit the order of through-put power control request.
As stated, suitable a kind of can the use in the multiple link adaptation method according to the state of WVAN equipment.Hereinafter, will come briefly to be described in the example of the state of radio signal communication period WVAN equipment according to an embodiment of the invention with reference to figure 11A to Figure 11 E.
Figure 11 A to Figure 11 E is that diagram is according to an embodiment of the invention, the view of the example of the communications status of deterioration through the state of WVAN equipment.
Figure 11 A illustrates the example that between the WVAN equipment that transmits and receive radio signals, has obstacle.If have obstacle in the radio signal path between equipment, then because reflection of signal etc. and possibly cause taking place garble.Therefore, need to change signal transmission path.In this case, do not have another signal transmission path of obstacle to be selected, and carry out beam steering, perhaps can use current HRP/LRP mode adjusting method in service to carry out link adaptation through the wave beam search.
Figure 11 B illustrates the example that increases and reduce in the WVAN transfer equipment that transmits and receive radio signals and the physical distance between the WVAN receiving equipment.If the physical distance between equipment increases, a little less than then RSSI possibly become.If the physical distance between equipment reduces, then RSSI increases, but power consumption possibly take place.Therefore, transmit the transfer equipment of signal according to an embodiment of the invention and can adjust through-put power, so that it increases or reduces according to the RSSI that causes by the physical distance between the equipment.
Figure 11 C illustrates the example of any one position change of the WVAN equipment that transmits and receive radio signals.Even keep the physical distance between the equipment, if shown in Figure 11 C, changed the position of equipment, then signal transmission path also changes and influences channel status.Therefore, transfer equipment request receiving equipment is carried out the wave beam search, and through selecting another antenna sets based on the feedback signal that transmits from receiving equipment and transmitting signal and carry out beam steering.
Figure 11 D illustrates and transmits the example that receives the interference effect that causes through another equipment that uses the channel identical with current channel with the WVAN equipment that receives radio signals.Even the state of current channel is good,, then cause the increase of jamming rate owing to other equipment if exist to use many other equipment of same channel.Therefore, WVAN equipment can be carried out the HRP/LRP mode adjustment in current channel.
Figure 11 E illustrates an example that is rotated in the WVAN equipment that transmits and receive radio signals.Even the position of physical distance between equipment or equipment does not change, but because the position of unidirectional antenna changes through the rotation of equipment continuously, so communications status is by deterioration.Therefore, transfer equipment request receiving equipment is carried out the wave beam search, and through selecting another antenna sets based on the feedback information that transmits from receiving equipment and transmitting signal and carry out beam steering.
In addition, communications status can be according to the various states of equipment and deterioration.In this case, suitable a kind of can according to circumstances selection the in the aforesaid link adaptation method.Yet link adaptation method is not limited to selected a kind of.And, can use two kinds or multiple link adaptation method.
As stated, in order to carry out link adaptation, transfer equipment can receive link recommendation information from receiving equipment during link recommendation, and it is needed to carry out link adaptation method.
Hereinafter, the link recommend method will briefly be described.
The link recommendation method can be divided into aggressive mode and Passive Mode; Wherein, Aggressive mode is used for transmitting the link recommendation information in response to the request of transfer equipment, and Passive Mode is used under the situation of the request that has no transfer equipment, transmitting the link recommendation information.
Figure 12 illustrates according to an embodiment of the invention, carries out the flow chart of the procedural example of the link recommendation between WVAN equipment.Particularly, Figure 12 illustrates the example of the link recommendation in aggressive mode.
With reference to Figure 12, receiving equipment receives packet (S40) from transfer equipment.Receiving equipment transmits ACK grouping (S41) in response to packet, and generation is used for the information element (IE) in the link recommendation of reception period.The result who is based on the channel status of measuring among the step S23 of Fig. 9 generates the information element (IE) that is used for link recommendation.If transmit link recommendation request message (S42) from transfer equipment, then receiving equipment generates the response message (S43) to request message.Link recommendation request message can be used for referring to the link assessment request message in the request link assessment of Fig. 9.Receiving equipment can be assessed channel status after receiving link recommendation request message.Response message comprises the information element that is used for link recommendation, and it is based on the channel status collected during the step that receives packet or signal quality and generates.
Afterwards, receiving equipment transmits link recommendation response message (S44) to transfer equipment.
Figure 13 illustrates according to an embodiment of the invention, the flow chart of another example of the process of the link recommendation of execution between WVAN equipment.Particularly, Figure 13 illustrates the example of the link recommendation in Passive Mode.
With reference to Figure 13, with the form identical with Figure 12, receiving equipment receives packet (S40) from transfer equipment.Receiving equipment can be measured the state of current channel in service, repeats to transmit the step (S41) that ACK divides into groups in response to packet simultaneously.At this moment; If the state of confirming current channel is by remarkable deterioration, perhaps RSSI becomes weak (S45), even then transfer equipment does not transmit link recommendation request message; Receiving equipment also freely confirms to transmit response message according to it, and it comprises link recommendation information (S46).
According to the data format that is used to transmit link recommendation request message and link recommendation response message, the above-mentioned link recommendation method of aggressive mode and Passive Mode can be divided into normal link recommend method and rapid link recommend method.
Example based on the link adaptation method of normal link recommend method comprises UEP method, wave beam searching method and HRP/LRP mode adjusting method.According to the normal link recommend method, link recommendation request message and response message thereof are transmitted according to the type of MAC order.Use is used for MAC orders the normal link recommend method of carrying out link recommendation to use the channel resource that separates with transfer of data to transmit the MAC order.And according to the normal link recommend method, transfer equipment transmits through-put power control request message to receiving equipment and is used as independent MAC order, and receives TPC information in response to through-put power control request message, with control transmission power.Alternatively, receiving equipment can transmit the MAC order to transfer equipment according to RSSI, with the control of request through-put power.
Therefore, through-put power can not be controlled through normal link recommendation method.
On the other hand, be different from the normal link recommend method, the rapid link recommend method does not use the MAC order that is used for link recommendation, and transmits packet or ACK grouping, and it comprises link recommendation request message and response message thereof.Therefore, the rapid link recommend method can not use the channel resource of separation to carry out link recommendation.And, owing to carry out the link recommendation processing in transfer of data and reception period, so the rapid link recommend method can be carried out than normal link recommend method quickly.
The present invention relates to be included in the link recommendation method of the TPC information that is used for link adaptation in the rapid link recommend method.
According to one embodiment of present invention, the example based on the link adaptation of rapid link recommend method comprises UEP method, wave beam searching method, HRP/LRP mode adjusting method and transmission power control method.
Figure 14 illustrates according to an embodiment of the invention, the flow chart of another example of the process of the link recommendation of the through-put power control that is used for link adaptation of execution between WVAN equipment.Particularly, Figure 14 illustrates the example of the link recommendation in the aggressive mode of rapid link recommend method.
With reference to Figure 14, the WVAN transfer equipment transmits packet to the WVAN receiving equipment, and wherein, packet comprises normal data packets and generated data grouping (S50).Normal data packets is the packet that comprises that single son divides into groups, and the generated data grouping is the packets that comprise that two to seven multiple sons divide into groups.Divide into groups if the WVAN transfer equipment transmits generated data, then it transmits and uses multiple message or the order that data are divided into groups or two or more identical sons divide into groups, and has improved the reception precision than normal data packets thus.
Receiving equipment transmits ACK grouping (S51) to transfer equipment in response to packet.At this moment, receiving equipment can be carried out communications status and the assessment of channel status during Data Receiving, and can collect the information that is used to define suitable transmission power value according to the signal strength signal intensity that receives (perhaps receiving intensity).Transfer equipment can transmit packet to receiving equipment, and wherein, packet comprises link recommendation request information (S52).At this moment, link recommendation request information comprises the solicited message that through-put power is controlled according to an embodiment of the invention.Link recommendation request information can be used to refer to the link assessment request message of request link assessment as shown in Figure 9, and receiving equipment can be assessed channel status after receiving link recommendation request information.
Receiving equipment generates link recommendation information (S53) according to the result of channel estimating or the signal strength information of measuring through step S50 that receives.And receiving equipment can be carried out channel estimating after receiving link recommendation request information.
Receiving equipment transmits the link recommendation information in response to link recommendation request information to transfer equipment, and wherein, link recommendation information comprises TPC information (S54).In this case, link recommendation information is comprised, and ACK divides into groups to packet, and it is included in the link recommendation request information that transmits among the step S52.Whether the transfer equipment decision comes control transmission power (S55) according to the TPC information that in link recommendation information, comprises.The through-put power that comprises in the TPC recommendation information that transfer equipment not necessarily need be followed at receiving equipment changes details.If the transfer equipment decision changes through-put power, then need not make transfer equipment to transmit the response message that separates to receiving equipment.The transfer equipment that has determined whether to change through-put power transmits to receiving equipment has the through-put power that changed or the data (S56) of original transmission power.
In the rapid link recommend method, transfer equipment can transmit the link recommendation information under the situation of the link recommendation request that does not have transfer equipment.
Figure 15 illustrates according to an embodiment of the invention, the flow chart of another example of the process of the link recommendation of the through-put power control that is used for link adaptation of execution between WVAN equipment.Particularly, Figure 15 illustrates the example of the link recommendation in the Passive Mode of rapid link recommend method.
With reference to Figure 15, the WVAN receiving equipment receives packet from transfer equipment, and wherein, packet comprises normal data packets and generated data grouping (S50).And the WVAN receiving equipment transmits ACK grouping (S51) in response to packet to the WVAN transfer equipment.At this moment, receiving equipment can be carried out communications status and the assessment of channel status during Data Receiving, and can collect the information (S60) that is used to define suitable transmission power value according to the signal strength signal intensity that receives (RSSI).
In step S60; If RSSI significantly dies down; If perhaps confirm since excessive RSSI cause need be bigger than required through-put power power capacity, even then do not having under the situation of link recommendation request, receiving equipment is also to transfer equipment transmission link recommendation information (S61).Equally, the ACK that receives in the step before link recommendation information is included in divides into groups to packet, and comprises TPC information.Transfer equipment determines whether changing through-put power (S62) according to the TPC information that in link recommendation information, comprises, and transmits A/V data (S63) to receiving equipment then.
In the rapid link recommend method, link recommendation request information is included in the packet, and it comprises MAC header fields and data field, and wherein, the MAC head comprises link recommendation request message.
Link recommendation information is included in the ACK that transmits from transfer equipment and divides into groups to packet.
ACK divides into groups to be divided into the LRPDU ACK that directed low-rate physical data cell (LRPDU) ACK divides into groups, omnirange LRPDU ACK divides into groups and wave beam forms and divides into groups.Directed LRPDU grouping comprises grouping with useful load and the grouping that does not have useful load.Directed LRPDU divides into groups mainly during the LRPDU transmission packets of ack signal or wave beam formation, to use.Directed LRPDU with useful load divides into groups to search between the transmission period that feedback information and wave beam form feedback information at wave beam and uses.Omnirange LRPDU divides into groups during broadcast singal or multiple LRP transmission packets, to use.The LRPDU that wave beam forms divides into groups in the LBP of high data rate transmission packets, to use.
The ACK that comprises link recommendation information according to the embodiment of the invention divides into groups to comprise that the directed LRPDU ACK with useful load field divides into groups and omnirange LRPDU ACK divides into groups.Link recommendation information can be included in the expansion control field of the directed LRPDU ACK grouping with useful load field, in the MAC extended head that perhaps omnirange LRPDU ACK divides into groups.This can confirm according to the data packet type that receives.
Yet, link recommendation request information is included in the MAC extended head, and link recommendation information is included in expansion control field or the MAC extended head only is exemplary.
Hereinafter, in order to describe the example that comprises link recommendation request information and link recommendation packets of information type, with the example that data of description is divided into groups or omnirange LRPDU ACK divides into groups.Packet or omnirange LRPDU ACK grouping generally include following data format as shown in table 1, and it comprises MAC head, HCS field, has the grouping main bodys that a plurality of sons divide into groups.
Table 1
| The MAC head | HCS | The grouping main body |
The MAC head can be divided into HRP MAC head and LRP MAC head.Hereinafter, will the MAC head be described with reference to Figure 16.The HCS field and comprises the CRC of 32 bits between MAC head and grouping main body.The grouping main body can comprise that minimum is that single son divides into groups to divide into groups to the son that is seven to the maximum.According to the grouping main body is that single son divides into groups or a plurality of son divides into groups, and packet can be divided into normal data packets and generated data divides into groups.Each sub-grouping can be configured to have various sizes.
Figure 16 illustrates according to an embodiment of the invention, and the view of the example of the MAC header format that transmits from WVAN equipment especially illustrates and comprises the example with the MAC head of the signal of LRP transmission through HRP.
With reference to Figure 16, HRP MAC header format comprises MAC control head 90, MAC extended head 91, safe head 92, video head 93, CP head 94 and reserved field 95.LRP MAC header format comprises MAC control head 90, MAC extended head 91, safe head 92, broadcasting or multicast (ReBoM) head 96 and reserved field 95 reliably.
MAC controls head 90 and comprises: transmit agreement, the grouping control details such as packet type, the equipment mark information of identification transmission respective packets and the equipment mark information that identification receives respective packets of dividing into groups.
MAC extended head 91 comprises information and one or more ACK group of information, HRP and the LRP pattern of the link with quick transmission speed between the link that is used for transfer of data.The ACK group is divided into groups corresponding to the son that in the grouping body field, comprises respectively.
Safe head 92 comprises that identification is used for encrypting through the data that divide into groups to transmit or the information of the key of authentication.
The video head 93 that in HRP MAC head, comprises only is included in the order of the video data that shows in the receiving equipment of receiving video data and the information of position.CP head 94 is used to transmit the content protection information of grouping, and its type can realize according to the content protecting method that is used for corresponding data in every way.
If the bit in the ReBoM head is set to 1, the ReBoM head 96 that then in LRP MAC head, comprises only comprises that forward direction LRP divides into groups.And ReBoM head 96 comprises the ACK bitmap region, and whether its equipment of indicating current transmission forward direction LRP to divide into groups has added the ReBoM processing.
The link recommendation request information and the link recommendation information that comprise TPC information according to an embodiment of the invention are included in the MAC extended head 91 shown in Figure 16.
Figure 17 illustrates according to an embodiment of the invention, the view of the example of the MAC extended head form that transmits from WVAN equipment.
With reference to Figure 17; MAC extension header portion comprises: expansion control field 100, be included in type of info field 101, LRPADT fields for feedback information 102, reserved field 103, the ACK group information field 104, the pixel clock field 105 that comprises the clock information of video data (for example, pixel) that constitute the data type that son that MAC divides into groups comprises in dividing into groups, the audio clock field 106 of the clock information that comprises voice data and the 27MHz clock field 107 that in source device, comprises the clock information of 27MHz.
LRP ADT feedback fields 102 comprises that antenna direction follows the tracks of (ADT) feedback information, is used between the following signal transmission period of the unidirectional mode of LRP, obtaining the transmission mode of optimizing.The index information of the transfer equipment antenna of the bit value representing optimized that in LRP ADT feedback fields 102, is provided with; Its short omnirange LRP preamble (preamble) through receiving at last, the LRPDU of ADT postamble (postamble) field that the unidirectional ACK before perhaps divides into groups measures.
As shown in table 2, ACK group field 104 comprises one or more fields, and said one or more fields comprise information that son divides into groups and comprise about whether using the field of the information of grouping checking sequence (PCS).Table 2 illustrates the example that generated data divides into groups.
Table 2
| Bit: 1 | 1 | ... | 1 | 1 |
| Son divides into |
Son divides into |
... | Son divides into groups | 1sb?PCS |
Because a grouping comprises MAC head and grouping main body, the grouping main body comprises that the son that is seven to the maximum divides into groups, so can the field as the information that comprises the son grouping that constitutes ACK group 104 be provided with the field that is seven to the maximum.
The sub-grouping information field that constitutes ACK group 104 comprises the information that the son before indicating whether to exist divides into groups.For example, if 1 bit is assigned to each field as shown in table 1, and the son before existing divides into groups, then the bit value of sub-grouping field be set to ' 1 '.If the son before not existing divides into groups, then the bit value of sub-grouping field be set to ' 0 '.In this case, the bit value that in the first sub-grouping field, is provided with is all the time ' 0 '.
The PCS field comprises that indication is determining whether correctly to receive the information of whether having used grouping checking sequence (PCS) in the sub step of dividing into groups.For example, as shown in table 1, be assigned at 1 bit under the situation of PCS field, if used PCS, then bit value be set to ' 1 '.If not like this, then bit value be set to ' 0 '.
Can define the ACK group that is five to the maximum.Reception comprises that the receiving equipment of the packet of aforementioned ACK group information transmits ack/nack signal to transfer equipment, and wherein, ack/nack signal comprises and indicates whether that each ACK group has received the information that son divides into groups.
Rapid link pattern field 1000 comprises following information, and whether its indication corresponding M AC extended head comprises link recommendation request information, perhaps in response to the link recommendation information of the solicited message in the rapid link suggested design.
For example, be assigned at 2 bits under the situation of rapid link pattern field 1000, if bit value be ' 00 ', then its indication does not have request link to recommend.If bit value is ' 01 ', then its indication request link recommendation.If bit value were ' 10 ', then its indication link recommendation information would be included in the rapid link pattern field.If bit value were ' 11 ', then the use of its indication field would be retained.Therefore, in the aforementioned embodiment, if transfer equipment recommend to the receiving equipment request link, then ' 01 ' bit value be set in the rapid link pattern field 1000.If receiving equipment transmits the link recommendation information to transfer equipment, then ' 10 ' bit value be set in the rapid link pattern field 1000.Yet, only be exemplary through type of message, and can make amendment the type of message of indicating through bit value with the 1000 corresponding bit value indications of rapid link pattern field.Various link recommendation pattern informations can be transmitted according to its bit that is assigned to the rapid link pattern field.
Likewise, LRP pattern field 1002 comprises the information that indicates whether to change current LRP pattern in service, and the index information of the LRP pattern that will recommend.For example, when 3 bits are assigned to LRP pattern field 1002, if the bit value of LRP pattern field be set to ' 111 ', then recommend to keep current LRP pattern.
In this case, the HRP pattern comprises one or more pattern, modulation scheme and the encoding rate etc. that depend on the code pattern that is applied to the data that in each son that constitutes the grouping main body divides into groups, comprise.Coding mode can be divided into aforementioned unequal number according to the coding mode of protection, the coding mode and highest significant position (MSB) retransmission scheme of equal error protection (EEP).Modulation scheme comprises QPSK (QPSK) scheme, 16-quadrature amplitude modulation (QAM) scheme.The QPSK scheme be transmit 2 bits with corresponding to the modulation scheme of four phase places of carrier wave.The 16-QAM scheme is the amplitude of mutual combined carriers and phase place is used a signal of 16 other 4 bits of level with expression modulation scheme.
The example of LRP comprises that omnirange LRP, directed LRP and wave beam form LRP.The LRP pattern comprises one or more pattern, forward error correction (FEC) pattern, PHY data rate mode and the repetition interval that depends on modulation scheme.In LRP, binary phase shift keying (BPSK) scheme is used as modulation scheme.The FEC pattern is used, and makes the recipient predict the message of using repetition bits.The FEC pattern comprises one or more pattern that depends on repetition bits.
For example, be assigned at 2 bits under the situation of TPC field 1003, if bit value be set to ' 00 ', then recommend to keep current through-put power.If bit value is set to ' 01 ', then recommend through-put power should increase 2dB.If bit value is set to ' 10 ', then recommend through-put power should reduce 2dB.If bit value is set to ' 11 ', then the use of its indication TPC field is retained.Yet the information of indicating through the bit value that in TPC field 1003, is provided with only is the example of TPC recommendation information, and it can change.And, increase if distribute to the bit of TPC field 1003, then can recommend than aforementioned 2dB more power biasing, and can also comprise that through the information that the bit value that in TPC field 1003, is provided with is indicated through-put power changes the information of reason.
Simultaneously, before transfer equipment can change through-put power in the TPC information that decision receive during whether being based on link recommendation according to an embodiment of the invention, to the detailed TPC information of receiving equipment request.
Figure 18 illustrates according to an embodiment of the invention, is used for the view in other examples of the link recommendation process of the through-put power control of the link adaptation of WVAN equipment.Particularly, Figure 18 illustrates the example of the link recommendation in the aggressive mode of rapid link recommend method.
With reference to Figure 18, the WVAN receiving equipment receives packet from the WVAN transfer equipment, and wherein, packet comprises normal data packets and generated data grouping (S50).Then, the WVAN receiving equipment transmits ACK and divides into groups in response to packet, and transmits the link recommendation information according to the request of transfer equipment, and wherein, link recommendation information comprises TPC information (S51 to S54).These steps of S51 to S54 are identical with the step shown in Figure 14, and are concise and to the point for what describe, with the description of omitting same steps as.
According to embodiments of the invention, the transfer equipment that has received the link recommendation information that comprises TPC information from receiving equipment can transmit probe request message, is used to ask TPC information element (S70).Receiving equipment transmits probe response message according to probe request message to transfer equipment, and wherein, probe response message is drawn together TPC information and RSSI information (S71).
In other words, according to illustrated embodiments of the invention in Figure 18, the information that transfer equipment can need to the receiving equipment request before the control of carrying out through-put power, and determine whether control transmission power (S72) based on institute's information requested.Transfer equipment can perhaps kept under the state of original transmission power through using the through-put power that during next transfer of data, changes, and transmits data (S73) to receiving equipment.
And, even in the rapid link recommend method of Passive Mode, can be according to the transfer equipment of the embodiment of the invention to receiving equipment request TPC information element before whether decision changes through-put power.
Figure 19 illustrates according to an embodiment of the invention, comprises the view of example of the data format of the probe request message that transmits from the WVAN transfer equipment.Probe request message is sent to receiving equipment from transfer equipment, will be as request through the order of transfer equipment information requested element (IE), said order can be, but be not limited to the MAC command type.
With reference to Figure 19, the probe request message that is sent to receiving equipment from transfer equipment comprises: comprise order id field 110, the MAC order length field 111 of the identification information of indication MAC command type and information element (IE) index field 112 that comprises at least one the IE index that will ask.
Probe request message can be sent to one or more equipment or telegon, and the equipment or the telegon that have received probe request message can transmit probe response message.Yet equipment or telegon not necessarily need transmit response message.According to embodiments of the invention, the receiving equipment that has received the probe request message of request TPC IE can transmit TPC report IE and be used as probe response message.
Figure 20 illustrates according to an embodiment of the invention, comprises the view of example of the data format of the probe response message that transmits from WVAN equipment.Particularly, data format comprises TPC report IE.Probe response message can transmit with the MAC command type, but it is not limited thereto.
With reference to Figure 20, probe response message is drawn together: comprise the order id field 120 of the ID of directive command type, the length field 121 of indication MAC order length and the IE field 122 that comprises the IE of at least one request.
It is unit that through-put power field 1222 can be indicated with dB, uses the power grade of 2 complement representation.For example, the power grade of+2dB is set to 0 * 02 bit, and-power grade of 2dB is set to 0 * FE bit.
The intensity of the current signal that receives of RSSI field 1223 indications, its susceptibility with respect to receiving equipment is measured.For example, if pass through the susceptibility of the receiving equipment in the current physical layer pattern, RSSI is measured as 6dB, and then RSSI field 1223 can be set to 0 * 06 bit.
The transfer equipment that has received the probe response message that comprises TPC IE can come control transmission power based on TPCIE.
Figure 21 illustrates according to an embodiment of the invention, comprises the view of example of the broadcast signal process system of WVAN equipment.
Usually, WVAN equipment can be play the A/V data through the processing that will describe subsequently, wherein, imports the A/V data through at least one from broadcasting station, wired, satellite and other WVAN equipment of antenna.If WVAN equipment is from other equipment receiving datas, then it can be a receiving equipment.If WVAN equipment is to other equipment transmission datas, then it can be a transfer equipment.And WVAN equipment can be carried out the message with telegon.
With reference to Figure 21, the network equipment 180 that comprises receiving equipment 150, remote controllers 160, local memory device 170 and be used for carrying out radio communications according to the broadcast signal process system of the embodiment of the invention with transfer equipment 190.
The receiving equipment 150 that receives the A/V data comprises receiver module 151, demodulation module 152, decoder module 153, display module 154, control module 155, graphic process unit 157, delivery module 158 and control signal communication module 159.In the example of Figure 21, transfer equipment further comprises and the delivery module 158 direct-connected local memory devices 170 that comprise input and output port.Yet local memory device 170 can be mounted in the memory device on the transfer equipment 190.
In addition, receiver module 151 can receive Internet Protocol (IP) stream that transmits with radio communication through wired.If receiver module 151 receives IP stream, then receiver module 151 can be handled to transmit and receive and divide into groups according to the IP agreement of the source and destination ground information of the grouping of having set up that the IP that is used to receive divides into groups and having transmitted from receiver.Receiver module 151 can be exported the video/audio/data stream that in the IP that receives divides into groups, comprises according to the IP agreement, and its can according to the IP agreement generate to be sent to network as IP transmission packets stream, so that with its output.Receiver module 151 is the elements that receive outside incoming video signal, and, for example, can receive IEEE 1394 type video/audio signals, perhaps HDMI type stream from the outside.
And receiver module 151 can receive link recommendation request information from transfer equipment according to one embodiment of present invention, and wherein, link recommendation request information comprises the TPC solicited message.
For example, if local memory device 170 is installed in the transfer equipment, then control module 155 can read out in the content of storage in the local memory device 170.And if local memory device 170 is installed in the transfer equipment, then control module 155 can be controlled the operation of local memory device 170, makes the broadcasted content that receives from receiver module 151 be stored in the local memory device 170.In addition, control module 155 can be exported control signal, is used for whether being installed in transfer equipment according to local memory device 170 local memory device 170 is installed.
The residue memory capacity of control module 155 inspection local memory devices 170, and allow on display module 154, to show the information of residual capacity for the user through graphic process unit 157.If local memory device 170 remaining lack of memory capacities, then control module 155 can arrive remote storage device with the transfer of content of storage in local memory device 170.In this case; The menu that control module 155 can show below through display module 154; Whether the content of this menu indication storage in local memory device 170 is transferred in another local memory device (not shown), perhaps transfers to remote storage device.And control module 155 can receive and handle the user control signal of this menu.Therefore, the content that control module 155 can allow to store in the memory device of or long-range installation direct at local memory device 170 and other shifts each other, and it is stored in wherein.
And control module 155 can be assessed channel status at the signal reception period through receiver module 151, or measure R SSI.According to previous embodiment, if owing to the change of the physical distance between transfer equipment and the receiving equipment has changed measured RSSI, then control module 155 can be suitable rssi measurement through-put power capacity.And control module 155 can generate the link recommendation information that comprises TPC information, and control delivery module 158 is sent to transfer equipment with the link recommendation information that is generated.At this moment, the link recommendation information that is generated is sent to transfer equipment through in ack/nack signal, being packaged into from the data that transfer equipment transmits.
And delivery module 158 can comprise interface module, to carry out in the two-way communication that belongs between the equipment of WVAN.Interface module can be docked with other equipment 190 of wireless network and at least one through wired.The example of interface module comprises ethernet module, bluetooth module, short-distance wireless internet module, portable internet module, family expenses PNA module, IEEE 1394 modules, PLC module, home rf module, IrDA module.
If broadcast signal process system shown in figure 21 comprises transfer equipment according to an embodiment of the invention, then the element of constitution equipment and system or module comprise and those components identical or module shown in Figure 21.Yet transfer equipment can receive the link recommendation information that comprises TPC information from receiving equipment through receiver module 151, and control module 155 can be carried out link adaptation according to link recommendation information.And control module 155 can generate link recommendation request information, and it is to receiving equipment request link recommendation information, and control module 155 control delivery modules 159, to transmit the link recommendation request information that is generated to receiving equipment.At this moment, through being encapsulated in the packet that is sent to receiving equipment, the link recommendation request information that is generated is sent to receiving equipment.And control module 155 can determine whether control transmission power according to the TPC information that in link recommendation information, comprises.
Term at this can replace with other term.For example, " equipment " can use subscriber equipment (perhaps machine), station to wait and replace, and " telegon " can be used, and coordination (control) equipment, coordination (perhaps control) are stood, piconet coordinator (PNC) waits and replaces.And the WVAN parameter that constitutes WVAN can be used to refer to network configuration information.
With it is obvious that; Some claims that relate to the specific rights requirement can make up with the other claim that relates to other claims outside the said specific rights requirement; To constitute embodiment, perhaps after submit applications, add new claim through the mode of revising.
And packet means the information that is transmitted and receives, and divides into groups, still is not limited to specific packet such as message, business, audio/video data packets, control data.And message also can be used to refer to order.
At last, can in communication system, the example of equipment of executive communication comprise computer, PDA, notebook, DTV, video camera, digital camera, printer, Mike, loud speaker, headphone, bar code reader, display and cell phone.All digital devices can be used as equipment.
It will be apparent to those skilled in the art that under the situation that does not break away from spirit of the present invention and intrinsic propesties, can embody the present invention with other specific forms.Therefore, above embodiment should be considered to illustrative in all fields, rather than restrictive.Scope of the present invention should be confirmed through the proper explanations to accompanying claims, and all changes that drop in the equivalency range of the present invention all are included in the scope of the present invention.
Industrial usability
The present invention can be applied to wireless communication system and wireless HD system.The invention provides the method that exchanges messages and the embodiment of transmission and receiving equipment.
Claims (20)
1. method that the receiving equipment place in wireless network exchanges messages, said method comprises:
Receive first packet from transfer equipment; And
Transmit the link recommendation information to said transfer equipment, wherein, said link recommendation information comprises through-put power control (TPC) information of the through-put power that the transmission that is used for being controlled at said transfer equipment will be used.
2. method according to claim 1 further comprises from said transfer equipment receiving link recommendation request information, and wherein, said link recommendation request information is used for request link and recommends.
3. method according to claim 2, wherein, said link recommendation request information is included in the MAC extended head of second packet that receives from said transfer equipment.
4. method according to claim 3, wherein, said link recommendation information is included in the ACK grouping that transmits in response to said second packet.
5. method according to claim 4, wherein, said link recommendation information is included in the MAC extended head of said ACK grouping.
6. method according to claim 5, wherein, said MAC extended head comprises: the expansion control field, said expansion control field comprises control information; Type field, the type of data that said type field indication comprises in the son that constitutes the MAC grouping divides into groups; Low-rate physical (LRP) antenna direction is followed the tracks of (ADT) feedback fields, and said LRP ADT comprises the ADT feedback information, is used for obtaining the transmission mode of between following signal transmission period, optimizing in the LRP unidirectional mode; ACK group field, said ACK group field comprise the information whether the son grouping before the indication exists; And at least one clock field, said at least one clock field comprises the clock count information of video data or voice data.
7. method according to claim 6, wherein, said expansion control field comprises: link mode field, the type of said link mode field indication link recommendation; Two-forty physics (HRP) pattern field, the HRP pattern of the recommendation that said HRP pattern field indication will be used at said transfer equipment place; The LRP pattern field, the LRP pattern of the recommendation that said LRP pattern field indication will be used at said transfer equipment place; And the TPC field, said TPC field comprises said TPC information.
8. method according to claim 7, wherein, any one in said link mode field indication " not just in the request link recommendation ", " link recommendation request " and " link recommendation response ".
9. method according to claim 1, wherein, under the situation to the request of said link recommendation information from said transfer equipment not, said link recommendation information is sent to said transfer equipment.
10. method according to claim 9, wherein, said link recommendation information is included in the ACK grouping that is transmitted in response to second packet that receives from said transfer equipment.
11. method according to claim 10, wherein, said link recommendation information is included in the MAC extended head of said ACK grouping.
12. method according to claim 11, wherein, said MAC extended head comprises: the expansion control field, and said expansion control field comprises control information; Type field, the type of data that said type field indication comprises in the son that constitutes the MAC grouping divides into groups; The LRPADT feedback fields, said LRP ADT feedback fields comprises the ADT feedback information, is used for obtaining the transmission mode of between following signal transmission period, optimizing in the LRP unidirectional mode; ACK group field, said ACK group field comprise the information whether the son grouping before the indication exists; And at least one clock field, said at least one clock field comprises the clock count information of video data or voice data.
13. method according to claim 12, wherein, said expansion control field comprises: link mode field, the type of said link mode field indication link recommendation; The HRP pattern field, the HRP pattern of the recommendation that said HRP pattern field indication will be used at said transfer equipment place; The LRP pattern field, the LRP pattern of the recommendation that said LRP pattern field indication will be used at said transfer equipment place; And the TPC field, said TPC field comprises said TPC information.
14. method according to claim 13, wherein, any one in said link mode field indication " not just in the request link recommendation ", " link recommendation request " and " link recommendation response ".
15. method according to claim 1, wherein, said link recommendation information is confirmed based on the channel status of the channel that receives said first packet.
16. method according to claim 1, wherein, said TPC information comprises that indication is used for being controlled at the value of recommendation of the through-put power of said transfer equipment.
17. method according to claim 16, wherein, said value indication recommends not change through-put power.
18. method according to claim 16, wherein, said value indication is recommended through-put power is increased scheduled volume.
19. method according to claim 16, wherein, said value indication is recommended through-put power is reduced scheduled volume.
20. the receiving equipment of a wireless network, said receiving equipment comprises:
Delivery module;
Receiver module, said receiver module receives packet from delivery module; And
Control module; Said control module generates link recommendation information; And control said delivery module and transmit said link recommendation information to said transfer equipment; Wherein, said link recommendation information comprises through-put power control (TPC) information, is used for being controlled at the through-put power that will use in the transmission of said transfer equipment.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15550309P | 2009-02-25 | 2009-02-25 | |
| US61/155,503 | 2009-02-25 | ||
| KR10-2009-0119813 | 2009-12-04 | ||
| KR1020090119813A KR20100096998A (en) | 2009-02-25 | 2009-12-04 | Method of exchanging messages for transmission power control between devices in a wireless network, and devices for the same |
| PCT/KR2010/001146 WO2010098579A2 (en) | 2009-02-25 | 2010-02-24 | Method of exchanging messages between devices in a wireless network, and devices for the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102318413A true CN102318413A (en) | 2012-01-11 |
| CN102318413B CN102318413B (en) | 2014-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201080008033.0A Expired - Fee Related CN102318413B (en) | 2009-02-25 | 2010-02-24 | Method of exchanging messages between devices in a wireless network, and devices for the same |
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| KR (1) | KR20100096998A (en) |
| CN (1) | CN102318413B (en) |
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| CN112262417A (en) * | 2018-06-14 | 2021-01-22 | 住友电气工业株式会社 | Wireless sensor system, wireless terminal device, communication control method, and communication control program |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101975483B1 (en) * | 2012-06-20 | 2019-05-07 | 삼성전자주식회사 | Apparatus and method for transmitting packet in device to device communication system |
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| Publication number | Publication date |
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| KR20100096998A (en) | 2010-09-02 |
| CN102318413B (en) | 2014-04-02 |
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