CN104184509A - Relay coordination transmission method in wireless multicast system - Google Patents
Relay coordination transmission method in wireless multicast system Download PDFInfo
- Publication number
- CN104184509A CN104184509A CN201410453015.3A CN201410453015A CN104184509A CN 104184509 A CN104184509 A CN 104184509A CN 201410453015 A CN201410453015 A CN 201410453015A CN 104184509 A CN104184509 A CN 104184509A
- Authority
- CN
- China
- Prior art keywords
- multicast
- relay
- decoding
- source node
- signaling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention discloses a relay coordination transmission method in a wireless multicast system. The problems that the reliability is low and the cost is high in the prior art are solved. The method comprises the implementation steps that (1), a multicast user selects a feedback user according to instant channel gains; (2) a source node sends direct multicast signals to the multicast user and a relay, wherein the direct multicast signals are obtained after local data are encoded by cyclic redundancy check and a channel and modulated; (3) after the multicast and the relay carry out demodulation, channel decoding and check on the received signals, the feedback user feeds back corresponding signals to the source node and the relay according to local decoding check results; (4) the relay judges whether relay coordination transmission is needed or not according to the signals of the feedback user; if relay coordination transmission is needed, coordination relay selection is carried out, and the selected relay is used for sending the coordination multicast signals, and if relay coordination transmission is not needed, the relay keeps silent, and the source node gets ready to send new multicast transmission. The relay coordination transmission method has the advantages that the implementation complexity is low, the system resource utilization rate is high, and efficient transmission of the wireless multicast services can be achieved.
Description
Technical field
The invention belongs to wireless communication field, particularly relate to a kind of relay cooperative transmission method in wireless multicast system.
Background technology
Due to wireless channel, be subject to the factor impacts such as shadow fading, multipath fading, interference, transmitted signal experiences serious decay and fluctuation in wireless channel.Existing lot of research shows, multi-antenna technology can obtain space diversity gain, is highly resistant to the impact of multipath fading in wireless transmission, improves wireless network capacitance and coverage.Yet wireless network user terminal, owing to being subject to the restrictions such as volume, complexity and power, is difficult to apply multi-antenna technology and obtains space diversity gain.
Emerging wireless communication system is devoted to support higher rate, more eurypalynous data service, meanwhile, need to improve network coverage, improve wireless resource utility efficiency and wireless transmission reliability.In prior wireless network, use " relay cooperative " strategy, can process by distributed transmission and the signal of relaying and source node, for destination node structure " virtual multi-antenna array ", for the limited wireless user terminal in the aspects such as complexity and volume provides space diversity gain, ensure the service quality of wireless user's different kinds of business, improve the multinomial Key Performance Indicators such as wireless network capacitance, coverage rate, the error rate and outage probability.
In wireless multicast system, adopt " relay cooperative " strategy, need to be limited to the feature of poor link according to multicast transmission performance, suitable relaying cooperates to multicast transmission to determine How to choose, to assist better the multicast transmission between source node and user, thereby the diversity gain of multicast system and spectrum efficiency are maximized.Therefore, relay selection problem is research contents important in wireless multicast system.
For the problems referred to above, academia has launched research widely in recent years, and has obtained certain achievement in research.
In " the Cooperative Wireless Multicast:Performance Analysis and Power/Location Optimization " that H.Vicky Zhao in 2010 etc. deliver at " IEEE Transactions on Wireless Communications " (the international institute of electrical and electronic engineers radio communication of < < transactions > >) (volume June the 9th in 2010) (< < cooperate wireless multicast: performance evaluation and power/position optimization > >), two kinds of multicasting methods that cooperate have been proposed, analyzed the interruption performance of these two kinds cooperation multicasting methods.Theory analysis shows, than direct multicast transmission, two kinds of cooperation multicast transmission methods that this article proposes can significantly improve the interruption performance of multicast transmission, make multicast users obtain 2 rank space diversity gains.In addition, in literary composition, also according to the analysis result of outage probability, studied the impact on cooperation multicast interruption performance of power division and relaying position.A kind of incentive mechanism of the relay cooperative multicast transmission based on theory of games has been proposed in " Wireless Multicast Using Relays:Incentive Mechanism and Analysis " (< < wireless multicast is used relaying: incentive mechanism and analysis > >) that B.Hu in 2013 etc. deliver at " IEEE Transactions on Vehicular Technology " (the international institute of electrical and electronic engineers vehicle technology of < < transactions > >) (volume June the 62nd in 2013), and analyzed this machine-processed throughput performance.Theory analysis shows, this incentive mechanism can significantly promote the throughput of wireless multicast system.Yet the relaying of all correct decodings multicast transmission that cooperates is all considered in above-mentioned research, does not relate to and how to utilize relay selection further to promote multicast transmission performance in system, can not obtain maximum space diversity gain simultaneously.
I-H.Lee in 2013 etc. are at " IEEE Communications Letters ", (" International Electrical Electronic Engineering Association communication bulletin "), " Exact Outage Probability of Relay Selection in Decode-and-Forward Based Cooperative Multicast Systems " that (volume March the 17th in 2013) delivered, (" based on the relay selection Precise Interrupt probability of the cooperation multicast system that decoding forwards ") analyzes the optimum relay selection interruption performance of cooperation multicast system.The interrupt analysis of this article shows, the optimum relay selection of cooperation multicast system can obtain maximum space diversity gain, improves the reliability of cooperation multicast transmission.But the optimum relay selection that this article is considered needs the instantaneous channel condition information of the overall situation of whole system, and system complexity is high, cooperation expense is large, is unfavorable for applying in actual multicast system.
Summary of the invention
The object of the invention is to above-mentioned the deficiencies in the prior art, a kind of relay cooperative transmission method in wireless multicast system is proposed, to improve multicast transmission reliability, when meeting multicast service quality of service requirement, make full use of the system resources such as channel and transmitted power, make wireless user terminal obtain maximum space diversity gain, thereby reduce cooperation expense, improve multicast transmission reliability and Radio Resource utilization ratio.
Realizing technical scheme of the present invention is: the instantaneous channel gain of link between each multicast users measurement self and source node, carries out feedback user selection according to measurement result.After the direct multicast signals that send at source node, feedback user feeds back corresponding signaling according to the check results of its decoding to source node and each relaying.Source node and each relaying, according to the signaling feedback of receiving, determine whether and use relay cooperative multicast transmission.If use relay cooperative multicast transmission, the instantaneous channel gain of link between the relaying of all correct decodings measurement self and each multicast users, carries out cooperating relay selection according to measurement result, and sends cooperation multicast signals by selecteed relaying; Otherwise all relayings keep mourning in silence, source node will start to send new direct multicast signals.Concrete steps are as follows:
(1) each multicast users d
nmeasure instantaneous channel gain g (s, the d of link between self and source node s
n), and carry out feedback user selection according to measurement result, select feedback user d
*, wherein n ∈ 1 ..., N}, total number that N is multicast users;
(2) data that source node s will be sent out this locality are carried out cyclic redundancy check (CRC) coding, Channel Coding and Modulation successively, obtain direct multicast signals, and this signal is sent to all-multicast user and relaying;
(3) all relayings and multicast users are received after direct multicast signals, and this signal is separated to mediation decoding, obtain the data that source node s sends; All relayings and feedback user d
*decoding the data obtained is carried out to cyclic redundancy check (CRC), determine whether correct decoding multicast signals: if all relayings and feedback user d
*by the divisible default generator polynomial of the cyclic redundancy check (CRC) code of receiving, show that decoding is correct, otherwise, decoding failure;
(4) feedback user d
*whether correct according to the result of self decoding, the result of this direct multicast is carried out to signaling feedback: if feedback user d
*correct decoding, feedback user d
*to source node s and all relayings, feed back direct multicast success signaling; Otherwise, feedback user d
*to source node s and all relayings, feed back direct multicast failed signaling;
(5) source node s and all relayings, according to the signaling feedback of receiving, determine whether and use relay cooperative multicast transmission:
If source node s and all relayings are received direct multicast success signaling, all relayings do not carry out relay cooperative multicast transmission, and source node s will prepare to start new direct multicast transmission;
If source node s and all relayings are received direct multicast failed signaling, source node s no longer carries out new direct multicast transmission, but by the correct relaying execution step (6) of all decoding;
(6) relay cooperative multicast transmission:
(6.1) at correct each relaying r of decoding
kmeasure self and each multicast users d
nbetween the instantaneous channel gain g (r of link
k, d
n), and calculate its cooperation performance factor η (r
k)=min
n=1 ..., Ng(r
k, d
n), i.e. relaying r
kwith each multicast users d
nbetween the instantaneous channel gain minimum value of link, wherein k ∈ 1 ..., M}, M is the relaying sum that decoding is correct, N is multicast users sum in system;
(6.2) the relaying r that each decoding is correct
kaccording to its cooperation performance factor η (r
k) carry out cooperating relay selection, and therefrom select the relaying r of cooperation performance factor maximum
*as cooperating relay;
(6.3) cooperating relay r
*the data that obtain after correct decoding are carried out to cyclic redundancy check (CRC) coding, Channel Coding and Modulation successively, obtain the multicast signals that cooperate, and these multicast signals are sent to all-multicast user;
(6.4) all-multicast user is after receiving respectively the direct multicast signals that sent by step (3) and the cooperation multicast signals that sent by step (6.3), this two paths of signals is carried out to high specific merging, and the signal after being combined is separated mediation decoding.
Tool of the present invention has the following advantages:
1. the present invention proposes a kind of relay cooperative multicast transmission method that is applicable to wireless multicast system architecture, when source node provides multicast service to multicast users, the relaying of the performance factor maximum that cooperates in system is served for multicast users provides relay cooperative, thereby when meeting multicast service quality requirement, for multicast users constructing virtual multi-antenna array, make multicast users obtain maximum space diversity gain, improved the reliability of wireless multicast transmission.
2. the present invention proposes a kind of self adaptation relay cooperative mechanism based on multicast users signaling feedback, according to the signaling of feedback user, determine whether to use relay cooperative multicast transmission, only when directly multicast is failed, by cooperating relay, send cooperation multicast signals, thereby make full use of the Radio Resources such as channel in multicast system, transmitted power, frequency spectrum, improve the spectrum efficiency of wireless multicast transmission.
3. the present invention proposes a kind of distributed collaborative relay selection method, by each relaying local clock countdown and Signalling exchange, realizing cooperating relay selects, reduced wireless multicast system relay selection complexity, reduced the overhead of cooperation multicast transmission, performance cost, than high, has stronger practicality.
The system combined consideration cooperative diversity technique of above-mentioned wireless multicast and wireless multicast transmission feature, make full use of the system resources such as channel and transmitted power, make multicast users obtain maximum space diversity gain, thereby reduce cooperation expense, raising wireless multicast transmission reliability and spectrum efficiency.
Accompanying drawing explanation
Fig. 1 is the wireless multicast system model figure that the present invention uses
Fig. 2 is the general flow chart of realizing of the present invention;
Fig. 3 is the feedback user chooser flow chart in the present invention;
Fig. 4 is the cooperating relay chooser flow chart in the present invention.
Embodiment
With reference to Fig. 1, the wireless multicast system that the present invention uses, consists of 1 source node s, K cooperating relay, a N multicast users.
With reference to Fig. 2, performing step of the present invention is as follows:
Step 1: each multicast users d
nmeasure instantaneous channel gain g (s, the d of link between itself and source node s
n), and carry out feedback user selection according to measurement result.
As shown in Figure 3, in this step from multicast users d
nmiddle selection feedback user d
*be implemented as follows:
1.1) signaling of source node s broadcast " feedback user is selected to start ";
1.2) each multicast users d
nwhen receiving that feedback user is selected the signaling of beginning, the initial time of local clock is set to
and simultaneously from its initial time T (d
n) to zero, carry out countdown;
1.3) for the countdown multicast users d that taken the lead in
*, the signaling of having been selected by this multicast users broadcast feedback user, shows that this user is chosen as feedback user; Instantaneous channel gain g (s, the d of selected feedback user
*) meet g (s, d
*)=min
n=1 ... Ng (s, d
n);
1.4) when receiving the signaling that feedback user has been selected, all-multicast user stops countdown, and source node s is ready for sending direct multicast signals.
Step 2: the data that source node s will be sent out this locality carry out, after cyclic redundancy check (CRC) coding, Channel Coding and Modulation, producing direct multicast signals successively, and this signal is sent to all-multicast user and relaying.
2.1) after feedback user has been selected, first the data that source node will be sent out this locality carry out cyclic redundancy check (CRC) coding, so that multicast users and relaying judge that multicast signals receive and the correctness of decoding;
2.2) data after cyclic redundancy check (CRC) coding are sent into channel encoder, these data are carried out to chnnel coding, improve the error correcting and detecting ability of data, more adapt to wireless channel transmission;
2.3) data after chnnel coding are modulated, and modulation signal is carried out sending after power amplification, wherein said channel encoder adopts loe-density parity-check code, or convolution code, or the mode of both cascades, and to adopting the code word after aforesaid way coding to punching, improve code efficiency.
Step 3: receive after direct multicast signals, all-multicast user and relaying be to this signal demodulation decoding, each relaying and feedback user d
*carry out cyclic redundancy check (CRC), feedback user d
*the result of this direct multicast is carried out to signaling feedback.
3.1) all-multicast user and relaying carry out demodulation, decoding to direct multicast signals, obtain the data that source node s sends;
3.2) each relaying and feedback user d
*carry out cyclic redundancy check (CRC), determine whether correct decoding multicast signals: if all relayings and feedback user d
*by the divisible default generator polynomial of the cyclic redundancy check (CRC) code of receiving, show that decoding is correct, otherwise, decoding failure,
Due to feedback user d
*and link channel gain g (s, d between source node s
*)=min
n=1 ... Ng (s, d
n), if the correct decoding of feedback user can be guaranteed all-multicast user's correct decoding, therefore do not need all multicast users all to carry out cyclic redundancy check (CRC), here only need to be to feedback user d
*carry out cyclic redundancy check (CRC);
3.3) feedback user d
*the result of this direct multicast is carried out to signaling feedback: if feedback user d
*decoding correct, feedback user d
*to source node s and all relayings, feed back the successful signaling of direct multicast; Otherwise, feedback user d
*to source node s and all relayings, feed back the signaling of direct multicast failure;
Step 4: source node s and all relayings, according to the signaling feedback of receiving, are determined and carried out new direct multicast transmission, or relay cooperative multicast transmission.
4.1) when source node s and all relayings are received the successful signaling of direct multicast, show the all-multicast user direct multicast signals of correct decoding source node s, do not need relay cooperative multicast transmission, start to carry out new direct multicast transmission;
4.2) when source node s and all relayings are received the signaling of direct multicast failure, show to exist the not multicast users of the direct multicast signals of correct decoding source node s, carry out following steps;
4.3) cooperating relay is selected,
With reference to Fig. 4, being implemented as follows of this step:
4.3.1) receiving from feedback user d
*the signaling of direct multicast failure after, source node s broadcast cooperating relay is selected the signaling starting;
4.3.2) each correct decoding relaying r
kreceive after the signaling of cooperating relay selection beginning, calculate cooperation performance factor η (r
k)=min
n=1 ..., Ng(r
k, d
n), and local clock initial time is set to T (r
k)=μ exp (μ (r
k)), simultaneously from its initial time T (r
k) to zero, carry out countdown;
4.3.3) for the relaying r of the countdown that taken the lead in
*, the signaling of having been selected by this repeat broadcast cooperating relay, shows that this relaying is chosen as cooperating relay;
The cooperation performance factor η (r of this relaying
*) meet η (r
k)=min
n=1 ..., Ng(r
k, d
n), i.e. relaying r
kwith each multicast users d
nbetween the instantaneous channel gain minimum value of link;
4.3.4), when receiving the signaling that cooperating relay has been selected, all correct decoding relayings stop countdown, cooperating relay r
*be ready for sending cooperation multicast signals;
4.4) cooperating relay r
*the data that obtained by direct multicast signals are carried out, after cyclic redundancy check (CRC) coding, Channel Coding and Modulation, obtaining the multicast signals that cooperate successively, and this signal is sent to all-multicast user after power amplification.
Step 5: all-multicast user receives cooperation multicast signals, by itself and directly multicast signals high specific merging, and by signal demodulation decoding after merging.
Above-mentioned steps has been described preferred embodiment of the present invention, and obviously those skilled in the art can make various modifications and replacement to the present invention by reference to preferred embodiment of the present invention and accompanying drawing, within these modifications and replacement all should fall into protection scope of the present invention.
Claims (4)
1. the relay cooperative transmission method in wireless multicast system, comprises the steps:
(1) each multicast users d
nmeasure instantaneous channel gain g (s, the d of link between self and source node s
n), and carry out feedback user selection according to measurement result, select feedback user d
*, wherein n ∈ 1 ..., N}, total number that N is multicast users;
(2) data that source node s will be sent out this locality are carried out cyclic redundancy check (CRC) coding, Channel Coding and Modulation successively, obtain direct multicast signals, and this signal is sent to all-multicast user and relaying;
(3) all relayings and multicast users are received after direct multicast signals, and this signal is separated to mediation decoding, obtain the data that source node s sends; All relayings and feedback user d
*decoding the data obtained is carried out to cyclic redundancy check (CRC), determine whether correct decoding multicast signals: if all relayings and feedback user d
*by the divisible default generator polynomial of the cyclic redundancy check (CRC) code of receiving, show that decoding is correct, otherwise, decoding failure;
(4) feedback user d
*whether correct according to the result of self decoding, the result of this direct multicast is carried out to signaling feedback: if feedback user d
*correct decoding, feedback user d
*to source node s and all relayings, feed back the successful signaling of direct multicast; Otherwise, feedback user d
*to source node s and all relayings, feed back the signaling of direct multicast failure;
(5) source node s and all relayings, according to the signaling feedback of receiving, determine whether and use relay cooperative multicast transmission:
If source node s and all relayings are received direct multicast success signaling, all relayings do not carry out relay cooperative multicast transmission, and source node s will prepare to start new direct multicast transmission;
If source node s and all relayings are received direct multicast failed signaling, source node s no longer carries out new direct multicast transmission, but by the correct relaying execution step (6) of all decoding;
(6) relay cooperative multicast transmission:
(6.1) at correct each relaying r of decoding
kmeasure self and each multicast users d
nbetween the instantaneous channel gain g (r of link
k, d
n), and calculate its cooperation performance factor η (r
k)=min
n=1 ..., Ng(r
k, d
n), i.e. relaying r
kwith each multicast users d
nbetween the instantaneous channel gain minimum value of link, wherein k ∈ 1 ..., M}, M is the relaying sum that decoding is correct, N is multicast users sum in system;
(6.2) the relaying r that each decoding is correct
kaccording to its cooperation performance factor η (r
k) carry out cooperating relay selection, and therefrom select the relaying r of cooperation performance factor maximum
*as cooperating relay;
(6.3) cooperating relay r
*the data that obtain after correct decoding are carried out to cyclic redundancy check (CRC) coding, Channel Coding and Modulation successively, obtain the multicast signals that cooperate, and these multicast signals are sent to all-multicast user;
(6.4) all-multicast user is after receiving respectively the direct multicast signals that sent by step (3) and the cooperation multicast signals that sent by step (6.3), this two paths of signals is carried out to high specific merging, and the signal after being combined is separated mediation decoding.
2. the relay cooperative transmission method in wireless multicast system according to claim 1, in wherein said step (1), multicast users carries out feedback user d according to measurement result
*selection, carry out as follows:
(1a) source node s broadcasts feedback user to all-multicast user and selects the signaling starting;
(1b) each multicast users d
nafter receiving the signaling that feedback user is selected to start, according to its instantaneous channel gain measurement result g (s, d
n), by the initial time T (d of local clock
n) be set to:
Wherein, μ is unit interval length and meets μ >0;
(1c) each multicast users d
nlocal clock start the (d from initial time T simultaneously
n) to zero, carry out countdown;
(1d) the multicast users d of initial time minimum
*taken the lead in, after local clock countdown, being chosen as " feedback user ", and sent to all the other multicast users and source node s the signaling that feedback user has been selected;
(1e) allly receive that feedback user selected the multicast users of signaling to stop the countdown of local clock, and prepare the direct multicast signals of reception sources node s.
3. the relay cooperative transmission method in wireless multicast system according to claim 1, chnnel coding in wherein said step (2), adopt loe-density parity-check code, or convolution code, or the mode of both cascades is carried out, and to adopting the code word after aforesaid way coding to punching, to improve code efficiency.
4. the relay cooperative transmission method in wireless multicast system according to claim 1, the wherein described correct relaying r of each decoding of step (6.2)
kaccording to its cooperation performance factor η (r
k) carry out cooperating relay selection and carry out as follows:
(6.2a) after receiving direct multicast failed signaling, source node s starts signaling to the selection of all repeat broadcast cooperating relay;
(6.2b) in the selection of receiving cooperating relay, start after signaling each relaying r that decoding is correct
kaccording to its cooperation performance factor η (r
k), by the initial time T (r of local clock
k) be set to
T(r
k)＝μexp(-η(r
k))，
Wherein, μ is unit interval length and meets μ >0;
(6.2c) each relaying r of correct decoding
klocal clock start the (r from its initial time T simultaneously
k) to zero, carry out countdown;
(6.2d) the relaying r of initial time minimum
*taken the lead in, after local clock countdown, being chosen as " cooperating relay ", and selected signaling to all the other relayings transmission cooperating relay;
(6.2e) receiving that cooperating relay selected after signaling, the relaying that all decoding is correct stops the countdown of local clock, and keeps mourning in silence, simultaneously the relaying r of initial time minimum
*be ready for sending cooperation multicast signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410453015.3A CN104184509B (en) | 2014-09-05 | 2014-09-05 | relay cooperative transmission method in wireless multicast system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410453015.3A CN104184509B (en) | 2014-09-05 | 2014-09-05 | relay cooperative transmission method in wireless multicast system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104184509A true CN104184509A (en) | 2014-12-03 |
| CN104184509B CN104184509B (en) | 2017-09-05 |
Family
ID=51965289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410453015.3A Active CN104184509B (en) | 2014-09-05 | 2014-09-05 | relay cooperative transmission method in wireless multicast system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104184509B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104660318A (en) * | 2015-03-16 | 2015-05-27 | 西安科技大学 | Implementation method of cooperative transmission mechanism based on feedback information |
| CN104683086A (en) * | 2015-02-11 | 2015-06-03 | 广西师范大学 | Slow link adaptive method in various channel types |
| CN105375955A (en) * | 2015-10-26 | 2016-03-02 | 西安电子科技大学 | Cooperative transmission method in simultaneous wireless information and power transfer relay network |
| CN106060953A (en) * | 2016-06-08 | 2016-10-26 | 西安电子科技大学 | Joint relay selection and resource allocation method in wireless multicast system |
| CN113115233A (en) * | 2021-03-30 | 2021-07-13 | 南京邮电大学 | Opportunistic NOMA (non-access-point) cooperative multicast relay selection method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101656600A (en) * | 2009-09-14 | 2010-02-24 | 西安交通大学 | Implementation method of opportunistic cooperation diversity protocol based on reinforced selective amplification-forwarding |
| CN102594487A (en) * | 2011-01-13 | 2012-07-18 | 中兴通讯股份有限公司 | Wireless network and coding cooperation method in wireless communication |
| WO2013000171A1 (en) * | 2011-06-30 | 2013-01-03 | 北京邮电大学 | Method and device for controlling relay transmission based on non-reproduction relay mode |
| CN103533511A (en) * | 2013-10-30 | 2014-01-22 | 重庆邮电大学 | Terminal competition-based cooperation method in wireless cooperative multicast network |
| CN103747421A (en) * | 2014-01-13 | 2014-04-23 | 中国科学院计算技术研究所 | Two-stage cooperative multicast method and system |
-
2014
- 2014-09-05 CN CN201410453015.3A patent/CN104184509B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101656600A (en) * | 2009-09-14 | 2010-02-24 | 西安交通大学 | Implementation method of opportunistic cooperation diversity protocol based on reinforced selective amplification-forwarding |
| CN102594487A (en) * | 2011-01-13 | 2012-07-18 | 中兴通讯股份有限公司 | Wireless network and coding cooperation method in wireless communication |
| WO2013000171A1 (en) * | 2011-06-30 | 2013-01-03 | 北京邮电大学 | Method and device for controlling relay transmission based on non-reproduction relay mode |
| CN103533511A (en) * | 2013-10-30 | 2014-01-22 | 重庆邮电大学 | Terminal competition-based cooperation method in wireless cooperative multicast network |
| CN103747421A (en) * | 2014-01-13 | 2014-04-23 | 中国科学院计算技术研究所 | Two-stage cooperative multicast method and system |
Non-Patent Citations (1)
| Title |
|---|
| 杨龙，阔永红，陈健等: "认知中继网络的多中继选择方法", 《电子与信息学报》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104683086A (en) * | 2015-02-11 | 2015-06-03 | 广西师范大学 | Slow link adaptive method in various channel types |
| 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 |
| CN105375955A (en) * | 2015-10-26 | 2016-03-02 | 西安电子科技大学 | Cooperative transmission method in simultaneous wireless information and power transfer relay network |
| 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 |
| CN106060953A (en) * | 2016-06-08 | 2016-10-26 | 西安电子科技大学 | Joint relay selection and resource allocation method in wireless multicast system |
| 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 |
| CN113115233A (en) * | 2021-03-30 | 2021-07-13 | 南京邮电大学 | Opportunistic NOMA (non-access-point) cooperative multicast relay selection method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104184509B (en) | 2017-09-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106937256B (en) | A kind of cooperation multicast transmission method based on non-orthogonal multiple access technology | |
| CN101656600B (en) | Implementation method of opportunistic cooperation diversity protocol based on reinforced selective amplification-forwarding | |
| CN102625250B (en) | Fountain code-based collaboration multicast method | |
| CN101291197B (en) | Distributing and transmitting scheme with amplified forwarding power for wireless sensor network of two-hops | |
| CN101394255B (en) | Two-user collaboration communication method in multi-user wireless network | |
| CN101990324B (en) | Method for actively selecting user terminal in relay system and base station | |
| CN104184509A (en) | Relay coordination transmission method in wireless multicast system | |
| CN101491149A (en) | Method and apparatus for paging terminals in a wireless communication system | |
| CN101431393B (en) | Overlapping multiplexing transmission method, base station and user terminal | |
| Dai et al. | Linear network coding strategies for the multiple access relay channel with packet erasures | |
| CN102545992B (en) | Optimal relay selection and power distribution method of DF (decode-forward) relay system | |
| CN101442394B (en) | Network encode collaboration communication method capable of iteratively decoding | |
| CN101848060A (en) | Self-adaptive cooperation relay method through network coding | |
| CN102740352B (en) | Adaptive cooperation method, terminal, base station, and relay equipment based on relay selection | |
| US20160330634A1 (en) | Data Transmission Method and System | |
| CN101826935A (en) | Low-density parity check code-based relay cooperative transmission method | |
| CN101483817B (en) | Transmitting node power distribution method in multicast network based on regenerated network coding | |
| CN101394259B (en) | Space time collaboration diversity method in OFDMA system | |
| US9844067B2 (en) | Broadcasting method using device-to-device (D2D) communication in wireless communication system | |
| CN102547597B (en) | Relay-based cooperative multicast method | |
| CN102664711A (en) | Network coding cooperation method under base station feedback mechanism | |
| CN104994043B (en) | Satellite mobile communication adaptive cooperation transmission method based on node selection | |
| CN102123438B (en) | Dynamic selection multi-relay station cooperative transmission method | |
| CN101895925B (en) | Method for realizing downlink cooperative retransmission of relay station and relay station | |
| CN102394733B (en) | Double-base station single-relay multi-user data packet retransmission method based on network coding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230421 Address after: Room F301, Tanglege, Xi'an Software Park, No. 72 Keji Second Road, High tech Zone, Xi'an City, Shaanxi Province, 710075 Patentee after: XI'AN XUTONG ELECTRONIC TECHNOLOGY Corp. Address before: 710071 No. 2 Taibai South Road, Shaanxi, Xi'an Patentee before: XIDIAN University |