CN101282204A - Self-adaption collaboration retransmission method based on self-adaption coding modulation - Google Patents
Self-adaption collaboration retransmission method based on self-adaption coding modulation Download PDFInfo
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Abstract
The present invention discloses a self-adapting cooperative retransmission method based on the self-adapting coding modulation. The method selects an appropriate coding modulation plan grade and a largest retransmission number for transmitting the data package according to the channel state information of the direct transmission link from a source end to a target end and the service quality request of different services. Because of the broadcast characteristic of the radio channel, the target end and a relay node can receive the data simultaneously. If the target end does not decode correctly, the retransmission is actuated. The retransmission by the source end or the relay node is determined by the selected coding modulation plan and whether the relay node correctly receives the data package. The invention combines the self-adapting coding modulation technique, a hybrid automatic retransmission technique and cooperative diversity for consideration. The cooperation is selected to execute at the time when the cooperative gain is evident. The incorrect or no-gain cooperation is avoided thereby improving the transmission quality and effectively optimizing the whole capability of the system at the state that the spending of the cooperation signaling is reduced as possible.
Description
Technical field
The present invention relates to the link adaptation techniques in the communication system and the cooperation mode of each communication node, particularly at using adaptive coding and modulating (AMC) technology and mixing in the system of automatic request retransmission (HARQ) technology the effective coordination strategy of each communication node.
Background technology
Wireless channel is subjected to the influence of factors such as various external interference and multipath fading, has time-varying characteristics and fading characteristic.Multiple-input and multiple-output (MIMO) technology can provide diversity gain, effectively resists channel fading.Be the diversity gain that makes multi-input multi-output system obtain to expect, must keep certain minimum range between each antenna.But in real system, can't realize owing to the volume restrictions of communication node.For overcoming this defective, people have proposed the collaboration communication technology.It utilizes the broadcast characteristic of wireless channel, and the signal that the source end node is sent can be received by other users, therefore, can utilize the cooperation between the user to obtain antenna array gain.Studies show that the collaboration communication technology can effectively be improved covering performance, improve the reliability and the throughput of link.But, because cooperative association brings extra signaling consumption, so inappropriate cooperation might bring the loss of performance.Therefore, necessary appropriate design cooperation scheme is so that the gain that cooperation brings maximization.
Code check and modulation system that adaptive coding and modulating (AMC) technology can dynamically be regulated chnnel coding make it to be complementary with the instantaneous channel conditions of time varying channel, can improve the throughput and the availability of frequency spectrum of data communication.The forward error correction coding that mixed automatic request retransmission (HARQ) technological incorporation and automatic two basic error-control techniques of request retransmission (ARQ) are the important means that guarantee data reliable transmission on wireless time varying channel.The basic principle of mixing automatic request retransmission technology is: at transmitting terminal, information packet through the channel error correction encoding coding, is sent into channel then then at first through the error detection code coding.At receiving terminal, the information packet that receives is at first passed through the decoding of chnnel coding, is corrected in the mistake of introducing in the wireless channel transmission course.Pass through whether correct decoding of error detection code checking information packet then.If assay information packet correct decoding, receiving terminal sends confirmation signal (ACK) to transmitting terminal.Transmitting terminal continues to send next information packet; If check out the information data that receives to include error message, then abandon this information packet or preserve this information packet, send to transmitting terminal then and deny signal (NACK), transmitting terminal resends the information of this information packet according to predetermined transfer scheme.So repeat down,, then begin the transmission of a new information packet although correctly received or the still wrong maximum retransmission that reached of packet up to information packet.
Summary of the invention
The extra signaling consumption that the present invention is directed to existing collaboration communication technology existence causes the problem of performance loss, and a kind of adaptive cooperation repeating method based on adaptive coding and modulating that can improve the system transmissions performance under the situation that minimizes the node cooperation signaling consumption is provided.
Adaptive cooperation repeating method based on adaptive coding and modulating of the present invention may further comprise the steps:
(1) according to the quality of service requirement of business, obtain allowing Packet Error Ratio (PER) through the maximum after retransmitting, in conjunction with the channel condition information of current source end, determine chnnel coding modulation scheme rank and maximum retransmission to the direct transmission link of destination;
(2) the source end sends data to destination, and destination and via node receive data simultaneously;
(3) if the destination correct decoding, feedback acknowledgment signal (ACK) then, source end and via node receive the confirmation signal (ACK) simultaneously; If destination can not correct decoding, then feedback is denied that signal (NACK), source end and via node receive simultaneously and is denied signal (NACK);
(4) if the via node correct decoding, feedback acknowledgment signal (ACK) then, source end and destination receive the confirmation signal (ACK) simultaneously; If via node can not correct decoding, then feedback is denied that signal (NACK), source end and destination receive simultaneously and is denied signal (NACK);
(5) if the coded modulation scheme rank of this moment is 0, promptly the source end is in deep fade to the direct transmission channel of destination, and the via node correct decoding is then retransmitted by via node; Otherwise, retransmit by the source end;
(6) adopt high specific to merge at destination, if it is correct to merge back decoding, feedback acknowledgment signal (ACK) then, source end and via node receive the confirmation signal (ACK) simultaneously; If destination can not correct decoding, then feedback is denied that signal (NACK), source end and via node receive simultaneously and is denied signal (NACK);
(7) check whether arrive maximum retransmission, if no show then forwarded for (5) step to; If arrive maximum retransmission, then abandon this packet, begin to send next packet.
In above-mentioned (1) step, the corresponding relation of chnnel coding modulation scheme and channel condition information obtains by the Packet Error Ratio curve that emulation obtains.
It is one of following two kinds that the retransmission scheme of via node is selected:
Scheme 1: via node does not change present encoding modulation scheme rank when retransmitting.
Scheme 2: via node according to the channel condition information of via node to destination, is reselected the coded modulation scheme rank when retransmitting.
The present invention is with adaptive coding modulation, mix automatic request retransmission technology and collaboration diversity and combine consideration, being chosen in cooperative gain significantly constantly cooperates, avoided incorrect or do not had the cooperation of gain, thereby under the situation that has reduced the cooperation signaling consumption as much as possible, effective optimization the entire system performance, under the poor situation of channel condition, the performance gain that the present invention brings is more outstanding.
Description of drawings
Fig. 1 is the present invention's topological structure in the model in three nodes.Wherein S is the source end, and D is a destination, and R is a via node; Solid line is represented direct transmission link, and dotted line is represented repeated link.
Fig. 2 is the implementing procedure figure of the method for the invention.
Fig. 3 is the performance comparison diagram of the present invention and traditional scheme.
Embodiment
With most typical and general three nodal analysis methods of tool is the example explanation adaptive cooperation repeating method based on adaptive coding and modulating of the present invention, and system model as shown in Figure 1.
The specific implementation step is as shown in Figure 2:
The 1st step: according to the quality of service requirement of different business, obtain allowing Packet Error Ratio (PER),, determine the coded modulation scheme rank in conjunction with current state information of channel through the maximum after retransmitting;
The 2nd step: the source end sends data to destination, and destination and via node receive data simultaneously;
The 3rd step: if the destination correct decoding, feeding back ACK then, source end and via node receive ACK simultaneously; If destination can not correct decoding, then feed back NACK, source end and via node receive NACK simultaneously.
The 4th step: if the via node correct decoding, feeding back ACK then, source end and destination receive ACK simultaneously; If via node can not correct decoding, then feed back NACK, source end and destination receive NACK simultaneously;
The 5th step: if the coded modulation scheme rank of this moment is 0, promptly the source end is in deep fade to the direct transmission channel of destination, and the via node correct decoding is then retransmitted by via node; Otherwise, retransmit by the source end;
The 6th step: adopt high specific to merge at destination, if it is correct to merge back decoding, feeding back ACK then, source end and via node receive ACK simultaneously; If destination can not correct decoding, then feed back NACK, source end and via node receive NACK simultaneously;
The 7th step: check whether arrive maximum retransmission, if no show then forwarded for the 5th step to; If arrive maximum retransmission, then abandon this packet, begin to send next packet.
Need to prove that implementation process of the present invention is in the 1st step, when selecting coded modulation scheme according to channel condition, the corresponding relation of chnnel coding modulation scheme and channel condition can obtain the Packet Error Ratio curve by emulation and obtain.
Also need explanation, in some system, in order to reduce complexity, the coded modulation scheme rank is constant in the regulation retransmission processes.In order to ensure with the compatibility of multisystem more, in the present invention, the regulation via node can be selected two kinds of retransmission schemes:
Scheme 1: via node does not change present encoding modulation scheme rank when retransmitting.Advantage: do not need to estimate the channel condition information of via node to destination, complexity is low.Shortcoming: the coded modulation scheme rank might not match with the channel status of via node to destination.
Scheme 2: via node according to the channel condition information of via node to destination, is reselected the coded modulation scheme rank when retransmitting.Advantage: coded modulation scheme rank and via node are complementary to the channel status of destination.Shortcoming: complexity height.
Having provided the present invention among Fig. 3 compares with the spectrum efficiency performance of traditional scheme (only unite and consider adaptive coding modulation and mix automatic request retransmission technology, and do not consider that adaptive cooperation retransmits).Wherein, the average signal-to-noise ratio of source end to via node channeling and trunking node to the destination channel all is γ, and the source end is γ/4 to the average signal-to-noise ratio of destination channel.This is that a kind of typical via node is positioned near the network model of the source end destination mid point time.Do as one likes can relatively can draw: to all γ values, the present invention is good than traditional scheme performance, and is lower in the γ value especially, and just under the poor situation of channel condition, the performance gain that the present invention brings is more outstanding.
Claims (3)
1. the adaptive cooperation repeating method based on adaptive coding and modulating is characterized in that, may further comprise the steps:
(1) according to the quality of service requirement of business, obtain allowing Packet Error Ratio through the maximum after retransmitting, in conjunction with the channel condition information of current source end, determine chnnel coding modulation scheme rank and maximum retransmission to the direct transmission link of destination;
(2) the source end sends data to destination, and destination and via node receive data simultaneously;
(3) if the destination correct decoding, feedback acknowledgment signal then, source end and via node receive the confirmation signal simultaneously; If destination can not correct decoding, then feedback is denied that signal, source end and via node receive simultaneously and is denied signal;
(4) if the via node correct decoding, feedback acknowledgment signal then, source end and destination receive the confirmation signal simultaneously; If via node can not correct decoding, then feedback is denied that signal, source end and destination receive simultaneously and is denied signal;
(5) if the coded modulation scheme rank of this moment is 0, promptly the source end is in deep fade to the direct transmission channel of destination, and the via node correct decoding is then retransmitted by via node; Otherwise, retransmit by the source end;
(6) adopt high specific to merge at destination, if it is correct to merge back decoding, feedback acknowledgment signal then, source end and via node receive the confirmation signal simultaneously; If destination can not correct decoding, then feedback is denied that signal, source end and via node receive simultaneously and is denied signal;
(7) check whether arrive maximum retransmission, if no show then forwarded for (5) step to; If arrive maximum retransmission, then abandon this packet, begin to send next packet.
2. the adaptive cooperation repeating method based on adaptive coding and modulating according to claim 1 is characterized in that, in described (1) step, the corresponding relation of chnnel coding modulation scheme and channel condition information obtains by the Packet Error Ratio curve that emulation obtains.
3. the adaptive cooperation repeating method based on adaptive coding and modulating according to claim 1 is characterized in that, it is one of following two kinds that the retransmission scheme of described via node is selected:
Scheme 1: via node does not change present encoding modulation scheme rank when retransmitting.
Scheme 2: via node according to the channel condition information of via node to destination, is reselected the coded modulation scheme rank when retransmitting.
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