CN104184509B - relay cooperative transmission method in wireless multicast system - Google Patents
relay cooperative transmission method in wireless multicast system Download PDFInfo
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Abstract
The invention discloses a kind of relay cooperative transmission method in wireless multicast system, the problem of prior art reliability is relatively low, expense is larger is mainly solved.Implementation step is：1) multicast users select feedback user according to instantaneous channel gain；2) source node sends to multicast users and relaying and direct multicast signals is obtained after CRC coding, Channel Coding and Modulation by local data；3) multicast users and relaying docking, which are collected mail, number is demodulated, after channel decoding and verification, and corresponding signaling is fed back to source node and relaying according to its local decoding check results from feedback user；4) relaying determines whether to use relay cooperative transmission according to the signaling of feedback user：If so, then carrying out cooperating relay selection, and cooperation multicast signals are sent by selected relaying, conversely, relaying keeps silent, source node is ready for sending new multicast transmission.The present invention has low implementation complexity, and the high efficiency of transmission of wireless multicast business can be achieved in the high advantage of resource utilization ratio.
Description
Technical field
The invention belongs to wireless communication field, the relay cooperative transmission side in more particularly to a kind of wireless multicast system
Method.
Background technology
Because wireless channel is influenceed by factors such as shadow fading, multipath fading, interference, signal is sent in wireless channel
Experience serious decay and fluctuation.Existing lot of research shows that multi-antenna technology can obtain space diversity gain, can be effective
Resistance is wirelessly transferred the influence of middle multipath fading, improves wireless network capacitance and coverage.However, wireless network user terminal
Due to being limited by volume, complexity and power etc., it is difficult to which application multi-antenna technology obtains space diversity gain.
Emerging wireless communication system is directed to supporting higher rate, further types of data service, while, it is necessary to improving
Network coverage, improve wireless resource utility efficiency and be wirelessly transferred reliability." relaying association is used in prior wireless network
Make " strategy can be purpose joint structure " virtual multi-antenna battle array by relaying distributed transmission and signal transacting with source node
Row ", space diversity gain is provided for wireless user terminal limited in terms of complexity and volume, ensures wireless user's inhomogeneity
The service quality of type business, improves the multinomial Key Performance Indicators such as wireless network capacitance, coverage rate, the bit error rate and outage probability.
Using " relay cooperative " strategy, it is necessary to according to multicast transmission limited performance in worst link in wireless multicast system
The characteristics of, determine how selection suitable relaying and multicast transmission is cooperated, preferably to assist between source node and user
Multicast transmission, so that the diversity gain and spectrum efficiency of multicast system are maximized.Therefore, relay selection problem is wireless many
Important research contents in broadcast system.
In view of the above-mentioned problems, academia has expanded extensive research in recent years, and achieve certain achievement in research.
H.Vicky Zhao in 2010 etc. are in " IEEE Transactions on Wireless Communications "
(《International Electrical Electronic Engineering Association radio communication transactions》) (in the June, 2010 of volume 9) " Cooperative for delivering
Wireless Multicast:Performance Analysis and Power/Location Optimization”(《Association
Make wireless multicast：Performance evaluation and power/position optimization》) in propose two kinds cooperation multicasting methods, analyze both cooperation
The interruption performance of multicasting method.Theory analysis shows, compared to direct multicast transmission, two kinds of cooperation multicast transmissions that this article is proposed
Method can significantly improve the interruption performance of multicast transmission, multicast users is obtained 2 rank space diversity gains.In addition, in text also
According to the analysis result of outage probability, the influence of power distribution and intermediate position to the multicast interruption performance that cooperates have studied.2013
Year B.Hu etc. " IEEE Transactions on Vehicular Technology " (《International Electrical Electronic Engineering Association
Vehicle technology transactions》) (in the June, 2013 of volume 62) " Wireless Multicast Using Relays for delivering:
Incentive Mechanism and Analysis”(《Wireless multicast uses relaying：Incentive mechanism and analysis》) in propose
A kind of incentive mechanism of the relay cooperative multicast transmission based on theory of games, and analyze the throughput performance of the mechanism.It is theoretical
Analysis shows, the incentive mechanism can be obviously improved the handling capacity of wireless multicast system.However, the studies above considers all correct
The relaying of decoding is while the multicast transmission that cooperates, is passed without reference to how further to be lifted multicast using relay selection in systems
Defeated performance, it is impossible to obtain maximum space diversity gain.
I-H.Lee in 2013 etc. " IEEE Communications Letters " (《International Electrical Electronics Engineer assists
Can be communicated bulletin》) (in the March, 2013 of volume 17) " Exact Outage Probability of Relay for delivering
Selection in Decode-and-Forward Based Cooperative Multicast Systems”(《Based on solution
The relay selection Precise Interrupt probability of the cooperation multicast system of code forwarding》) on analyze cooperation multicast system optimal relaying choosing
Select interruption performance.The interrupt analysis of this article shows that the optimal relay selection of cooperation multicast system can obtain the space diversity of maximum
Gain, improves the reliability of cooperation multicast transmission.But the optimal relay selection that this article considers needs the overall situation of whole system instantaneous
Channel condition information, system complexity is high, and cooperation expense is big, is unfavorable for applying in actual multicast system.
The content of the invention
It is an object of the invention to above-mentioned the deficiencies in the prior art, propose that the relay cooperative in a kind of wireless multicast system is passed
Transmission method, to improve multicast transmission reliability, while meeting multicast service quality of service requirement, makes full use of channel and hair
The system resources such as power are sent, wireless user terminal is obtained maximum space diversity gain, so as to reduce cooperation expense, are improved many
Broadcast transmission reliability and Radio Resource utilization ratio.
Realize the technical scheme is that：The transient channel that each multicast users measure itself link between source node increases
Benefit, feedback user selection is carried out according to measurement result.After the direct multicast signals that source node is sent, feedback user is translated according to it
The check results of code feed back corresponding signaling to source node and each relaying.Source node and each relaying according to the signaling feedback received,
Determine whether to use relay cooperative multicast transmission.If using relay cooperative multicast transmission, the relaying of all correct decodings is measured
The instantaneous channel gain of itself link between each multicast users, cooperating relay selection is carried out according to measurement result, and by being chosen
Relaying send cooperation multicast signals；Otherwise, all relayings keep silent, and source node, which will start the new direct multicast of transmission, to be believed
Number.Comprise the following steps that：
(1) each multicast users dnMeasure instantaneous channel gain g (s, the d of itself link between source node sn), and according to measurement
As a result feedback user selection is carried out, feedback user d is selected*, wherein n ∈ { 1 ..., N }, N is the total number of multicast users；
(2) source node s to locally carrying out CRC coding, channel coding and tune successively by data to be sent
System, obtains direct multicast signals, and the signal is sent to all-multicast user and relaying；
(3) all relayings and multicast users are received after direct multicast signals, and the signal is demodulated and decoded, source is obtained
The data that node s is sent；All relayings and feedback user d*CRC is carried out to decoding the data obtained, determined whether just
Really decode multicast signals：If all relayings and feedback user d*It is many with the divisible default generation of the CRC received
Item formula, then show that decoding is correct, otherwise, decoding failure；
(4) feedback user d*Whether correct according to the result that itself is decoded, the result to this direct multicast carries out signaling
Feedback：If feedback user d*Correct decoding, then feedback user d*Direct multicast success signaling is fed back to source node s and all relayings；
Conversely, feedback user d*Direct multicast failed signaling is fed back to source node s and all relayings；
(5) source node s and all relayings determine whether to use relay cooperative multicast transmission according to the signaling feedback received：
If source node s and all relayings receive direct multicast success signaling, all relayings are then without relay cooperative multicast
Transmission, source node s will prepare to start new direct multicast transmission；
If source node s and all relayings receive direct multicast failed signaling, source node s no longer carries out new direct multicast
Transmission, but step (6) is performed by the correct relaying of all decodings；
(6) relay cooperative multicast transmission：
(6.1) in the correct each relaying r of decodingkMeasure itself and each multicast users dnBetween link instantaneous channel gain g
(rk,dn), and calculate its performance factor η (r that cooperatek)=minN=1 ..., Ng(rk,dn), that is, relay rkWith each multicast users dnBetween chain
The instantaneous channel gain minimum value on road, wherein k ∈ { 1 ..., M }, M is decodes correct relaying sum, and N is multicast use in system
Family sum；
(6.2) the correct relaying r of each decodingkAccording to its performance factor η (r that cooperatek) cooperating relay selection is carried out, and therefrom
Select the maximum relaying r of cooperation performance factor*It is used as cooperating relay；
(6.3) cooperating relay r*The data obtained after correct decoding are carried out with CRC coding, channel successively to compile
Code and modulation, obtain the multicast signals that cooperate, and the multicast signals are sent to all-multicast user；
(6.4) all-multicast user is receiving by the direct multicast signals of step (3) transmission and sent out by step (6.3) respectively
After the cooperation multicast signals sent, maximum-ratio combing is carried out to this two paths of signals, and the signal after merging is demodulated and decoded.
The invention has the advantages that：
1. the present invention proposes a kind of relay cooperative multicast transmission method suitable for wireless multicast system framework, in source section
When point is to multicast users offer multicast service, the maximum relaying of performance factor that cooperated in system provides relaying association for multicast users
Service, so as to while multicast service quality demand is met, be multicast users construction virtual multi-antenna array, use multicast
Family obtains maximum space diversity gain, improves the reliability of wireless multicast transmission.
2. the present invention proposes a kind of adaptive relay cooperative mechanism based on multicast users signaling feedback, used according to feedback
The signaling at family decides whether to use relay cooperative multicast transmission, by cooperating relay transmission cooperation multicast only when direct multicast fails
Signal, so as to make full use of the Radio Resources such as channel in multicast system, transmit power, frequency spectrum, improves the frequency of wireless multicast transmission
Spectrum efficiency.
3. the present invention proposes a kind of distributed collaborative relay selection method, pass through each relaying local clock countdown and letter
Order interaction realizes that cooperating relay is selected, and reduces wireless multicast system relay selection complexity, reduces cooperation multicast transmission
Overhead, performance cost is than high, with stronger practicality.
Above-mentioned wireless multicast system joint considers cooperative diversity technique and wireless multicast transmission feature, make full use of channel and
The system resources such as transmit power, make multicast users obtain maximum space diversity gain, so as to reduce cooperation expense, improve wireless many
Broadcast transmission reliability and spectrum efficiency.
Brief description of the drawings
Fig. 1 is the wireless multicast system illustraton of model that the present invention is used
Fig. 2 be the present invention realize general flow chart；
Fig. 3 is the feedback user selection sub-process figure in the present invention；
Fig. 4 is the cooperating relay selection sub-process figure in the present invention.
Embodiment
Reference picture 1, the wireless multicast system that the present invention is used, by s, K cooperating relays of 1 source node, N number of multicast users
Constitute.
Reference picture 2, step is as follows for of the invention realizing：
Step 1：Each multicast users dnMeasure instantaneous channel gain g (s, the d of its link between source node sn), and according to survey
Measure result and carry out feedback user selection.
As shown in figure 3, from multicast users d in this stepnMiddle selection feedback user d*Be implemented as follows：
1.1) signaling of source node s broadcast " feedback user selection starts "；
1.2) each multicast users dnWhen receiving the signaling that feedback user selection starts, the initial time of local clock is set
It is set toAnd simultaneously from its initial time T (dn) carry out countdown to zero；
1.3) countdown multicast users d is completed for taking the lead in*, the letter that feedback user selection is completed is broadcasted by the multicast users
Order, shows that the user is chosen as feedback user；Instantaneous channel gain g (s, the d of selected feedback user*) meet g (s, d*)=
minN=1 ... Ng(s,dn)；
1.4) when receiving the signaling that feedback user selection is completed, all-multicast user stops countdown, and source node s prepares
Send direct multicast signals.
Step 2：Source node s to locally carrying out CRC coding, channel coding successively by data to be sent
After modulation, direct multicast signals are produced, and the signal is sent to all-multicast user and relaying.
2.1) after the completion of feedback user selection, source node to locally carrying out cyclic redundancy school first by data to be sent
Coding is tested, the correctness for receiving and decoding in order to multicast users and relaying judgement multicast signals；
2.2) data are carried out channel coding, carried by the data feeding channel encoder after CRC is encoded
The error correcting and detecting ability of high data, more adapts to wireless channel transmission；
2.3) data after channel coding are modulated, and modulated signal is subjected to transmission, wherein institute after power amplification
The channel encoder stated uses loe-density parity-check code, or convolutional code, or both cascade mode, and to using aforesaid way coding
Code word afterwards is punchinged, and improves code efficiency.
Step 3：Receive after direct multicast signals, all-multicast user and relaying are demodulated and decoded to the signal, each relaying
With feedback user d*Carry out CRC, feedback user d*Result to this direct multicast carries out signaling feedback.
3.1) all-multicast user and relaying are demodulated to direct multicast signals, decoded, and obtain the number that source node s is sent
According to；
3.2) each relaying and feedback user d*CRC is carried out, correct decoding multicast signals are determined whether：If institute
There are relaying and feedback user d*With the divisible default generator polynomial of the CRC received, then showing decoding just
Really, otherwise, decoding failure,
Due to feedback user d*Link channel gain g (s, the d between source node s*)=minN=1 ... Ng(s,dn), if feedback
The correct decoding of user, then can ensure that the correct decoding of all-multicast user, therefore not need all multicast users all to carry out
CRC, is only needed to feedback user d here*Carry out CRC；
3.3) feedback user d*Result to this direct multicast carries out signaling feedback：If feedback user d*Decoding it is correct,
Then feedback user d*The direct successful signaling of multicast is fed back to source node s and all relayings；Conversely, feedback user d*To source node s
With the signaling of the direct multicast failure of all relaying feedbacks；
Step 4：Source node s and all relayings are according to the signaling feedback received, it is determined that new direct multicast transmission is performed, or
Relay cooperative multicast transmission.
4.1) when source node s and all relayings receive the successful signaling of direct multicast, show all-multicast user just
Really decode source node s direct multicast signals, it is not necessary to relay cooperative multicast transmission, then proceed by new direct multicast and pass
It is defeated；
4.2) when source node s and all relayings receive the signaling of direct multicast failure, show there is non-correct decoding source
The multicast users of node s direct multicast signals, perform following steps；
4.3) cooperating relay is selected,
Reference picture 4, this step is implemented as follows：
4.3.1) receiving from feedback user d*Direct multicast failure signaling after, source node s broadcast collaborations relaying
Select the signaling started；
4.3.2) each correct decoding relaying rkReceive after the signaling that cooperating relay selection starts, calculate cooperation performance factor η
(rk)=minN=1 ..., Ng(rk,dn), and local clock initial time is set to T (rk)=μ exp (- μ (rk)), while from its
Initial time T (rk) carry out countdown to zero；
4.3.3 the relaying r of countdown) is completed for taking the lead in*, the signaling for selecting to complete by the repeat broadcast cooperating relay,
Show that the relaying is chosen as cooperating relay；
The cooperation performance factor η (r of the relaying*) meet η (rk)=minN=1 ..., Ng(rk,dn), that is, relay rkWith each multicast
User dnBetween link instantaneous channel gain minimum value；
4.3.4) when receiving the signaling that cooperating relay selection is completed, all correct decoding relayings stop countdown, cooperation
Relay r*It is ready for sending cooperation multicast signals；
4.4) cooperating relay r*The data obtained by direct multicast signals are subjected to CRC coding, channel successively
After coding and modulation, the multicast signals that cooperate are obtained, and the signal is sent after power amplification to all-multicast user.
Step 5：All-multicast user receives cooperation multicast signals, by itself and direct multicast signals maximum-ratio combing, and will
Signal after merging is demodulated and decoded.
Above-mentioned steps describe the preferred embodiment of the present invention, it is clear that those skilled in the art are preferred by reference to the present invention's
Example and accompanying drawing can make various modifications and replacement to the present invention, and these modifications and replacement should all fall into the protection model of the present invention
Within enclosing.
Claims (3)
1. a kind of relay cooperative transmission method in wireless multicast system, comprises the following steps：
(1) each multicast users dnMeasure instantaneous channel gain g (s, the d of itself link between source node sn), and according to measurement result
Feedback user selection is carried out, feedback user d is selected*, it is implemented as follows：
1.1) signaling of source node s broadcast " feedback user selection starts "；
1.2) each multicast users dnWhen receiving the signaling that feedback user selection starts, the initial time of local clock is set toAnd simultaneously from its initial time T (dn) countdown, wherein n ∈ { 1 ..., N } are carried out to zero, N is
The total number of multicast users, μ is unit time span and meets μ ＞ 0；
1.3) countdown multicast users d is completed for taking the lead in*, the signaling that feedback user selection is completed, table are broadcasted by the multicast users
The bright user is chosen as feedback user；Instantaneous channel gain g (s, the d of selected feedback user*) meet g (s, d*)=
minN=1 ... Ng(s,dn)；
1.4) when receiving the signaling that feedback user selection is completed, all-multicast user stops countdown, and source node s is ready for sending
Direct multicast signals；
(2) source node s is to locally carrying out CRC coding, Channel Coding and Modulation successively by data to be sent,
Direct multicast signals are obtained, and the signal is sent to all-multicast user and relaying；
(3) all relayings and multicast users are received after direct multicast signals, and the signal is demodulated and decoded, source node is obtained
The data that s is sent；All relayings and feedback user d*CRC is carried out to decoding the data obtained, determines whether correctly to translate
Code multicast signals：If all relayings and feedback user d*It is multinomial with the divisible default generation of the CRC received
Formula, then show that decoding is correct, otherwise, decoding failure；
(4) feedback user d*Whether correct according to the result that itself is decoded, the result to this direct multicast carries out signaling feedback：
If feedback user d*Correct decoding, then feedback user d*The direct successful signaling of multicast is fed back to source node s and all relayings；Instead
It, feedback user d*The signaling of direct multicast failure is fed back to source node s and all relayings；
(5) source node s and all relayings determine whether to use relay cooperative multicast transmission according to the signaling feedback received：
If source node s and all relayings receive direct multicast success signaling, all relayings then without relay cooperative multicast transmission,
Source node s will prepare to start new direct multicast transmission；
If source node s and all relayings receive direct multicast failed signaling, source node s no longer carries out new direct multicast and passed
It is defeated, but step (6) is performed by the correct relaying of all decodings；
(6) relay cooperative multicast transmission：
(6.1) in the correct each relaying r of decodingkMeasure itself and each multicast users dnBetween link instantaneous channel gain g (rk,
dn), and calculate its performance factor η (r that cooperatek)=minN=1 ..., Ng(rk,dn), that is, relay rkWith each multicast users dnBetween link
Instantaneous channel gain minimum value, wherein k ∈ { 1 ..., M }, M are the correct relaying sum of decoding, and N is total for multicast users in system
Number；
(6.2) the correct relaying r of each decodingkAccording to its performance factor η (r that cooperatek) cooperating relay selection is carried out, and therefrom select
Cooperate the maximum relaying r of performance factor*It is used as cooperating relay；
(6.3) cooperating relay r*CRC coding, channel coding and tune are carried out successively to the data obtained after correct decoding
System, obtains the multicast signals that cooperate, and the multicast signals are sent to all-multicast user；
(6.4) all-multicast user is receiving by the direct multicast signals of step (3) transmission and by step (6.3) transmission respectively
Cooperate after multicast signals, maximum-ratio combing is carried out to this two paths of signals, and the signal after merging is demodulated and decoded.
2. the relay cooperative transmission method in wireless multicast system according to claim 1, wherein in the step (2)
Channel coding, using loe-density parity-check code, or convolutional code, or both the mode of cascade carry out, and to using aforesaid way coding
Code word afterwards is punchinged, to improve code efficiency.
3. described in the relay cooperative transmission method in wireless multicast system according to claim 1, wherein step (6.2)
Each correct relaying r of decodingkAccording to its performance factor η (r that cooperatek) carry out cooperating relay selection carry out as follows：
(6.2a) after direct multicast failed signaling is received, the selection of source node s to all repeat broadcast cooperating relays starts letter
Order；
(6.2b) after the selection for receiving cooperating relay starts signaling, decoding is correct respectively to relay rkAccording to its performance factor η that cooperates
(rk), by the initial time T (r of local clockk) be set to
T(rk)=μ exp (- η (rk)),
Wherein, μ is unit time span and meets μ ＞ 0；
Each relaying r of (6.2c) correct decodingkLocal clock start simultaneously at from its initial time T (rk) carry out countdown to zero；
The minimum relaying r of (6.2d) initial time*Take the lead in complete local clock countdown after, be chosen as " cooperating relay ", and to its
Remaining relaying sends cooperating relay selection and completes signaling；
(6.2e) after cooperating relay selection completion signaling is received, all correct relayings of decoding stop counting for local clock
When, and keep silent, while the minimum relaying r of initial time*It is ready for sending cooperation multicast signals.
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| CN104683086B (en) * | 2015-02-11 | 2017-11-03 | 广西师范大学 | Slow speed link adaptive approach under various channel types |
| CN104660318A (en) * | 2015-03-16 | 2015-05-27 | 西安科技大学 | Implementation method of cooperative transmission mechanism based on feedback information |
| CN105375955B (en) * | 2015-10-26 | 2018-07-17 | 西安电子科技大学 | A kind of cooperation transmission method in letter energy simultaneous interpretation junction network |
| CN106060953B (en) * | 2016-06-08 | 2019-07-26 | 西安电子科技大学 | Joint relay selection and resource allocation methods in a kind of wireless multicast system |
| CN113115233B (en) * | 2021-03-30 | 2022-07-01 | 南京邮电大学 | Opportunistic NOMA (non-access-point) cooperative multicast relay selection method |
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