CN106332218A - Relay control method and device - Google Patents

Relay control method and device Download PDF

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Publication number
CN106332218A
CN106332218A CN201610716114.5A CN201610716114A CN106332218A CN 106332218 A CN106332218 A CN 106332218A CN 201610716114 A CN201610716114 A CN 201610716114A CN 106332218 A CN106332218 A CN 106332218A
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China
Prior art keywords
relay
vehicle communication
noise ratio
received signal
signal
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CN201610716114.5A
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Inventor
冯文江
代才莉
姚楚楠
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Chongqing University
Shenzhen Tinno Wireless Technology Co Ltd
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Chongqing University
Shenzhen Tinno Wireless Technology Co Ltd
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Priority to CN201610716114.5A priority Critical patent/CN106332218A/en
Publication of CN106332218A publication Critical patent/CN106332218A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a relay control method and device. The relay control method comprises the steps of: receiving a relay selection request from a plurality of vehicle-mounted communication terminals; calculating a received signal to noise ratio corresponding to a signal from each vehicle-mounted communication terminal according to the received relay selection request; and determining whether a replay service is provided for the plurality of vehicle-mounted communication terminals or not. Through the technical scheme of the method, a manner that the incoming vehicle-mounted communication terminals in a user domain can autonomously decide whether or not to be provided with the relay is adopted, so that the relay selection reliability is greatly improved, the communication performance quality is ensured conveniently, and the effective relay coverage range extension is facilitated.

Description

Relay and control method and relay controller
[technical field]
The present invention relates to car-mounted terminal technical field, particularly relate to a kind of relay and control method and a kind of relay and control dress Put.
[background technology]
At present, car networking is as the extension of Internet of Things and expansion, by information structures such as vehicle location, speed and routes The Internet, after it carries out self environment and status information capture, accesses the Internet by collaboration communication between vehicle, by information Transmission Convergence is to centre platform, and is analyzed and process information of vehicles by computer, thus calculates different vehicle Good route, report without delay road conditions and arrange the content such as signal lamp cycle.
Inter-vehicle communication in a large amount of motions and car Network Communication constitute that a region is wide, topology dynamically change, communication node are rich Rich mobile wireless self-organized network.In the network, utilizing communication for coordination, vehicle communication terminal can by relay selection each other Shared channel resources, it is desirable to reach to improve work efficiency, extended coverage range, the purpose of enhancing transmission reliability.
Specifically, in the related, it has been simply to exhale vehicle communication terminal to arrive chain between purpose vehicle communication terminal Second-rate the rising in road exhales vehicle communication terminal to arrange high priority, to obtain more preferable relay services, successively will by sequence Best relay is distributed to worst the rising of link-quality and is exhaled vehicle communication terminal.But, at the mobile wireless being made up of moving vehicle In self-organizing network, channel state variations is the highest to the ageing requirement of relay selection, and above-mentioned relay selection method is the most uncombined Network topology change feature, it is difficult to ensure the real-time performance of communication for coordination.
Therefore, promote the reliability of relay selection the most further, become technical problem the most urgently to be resolved hurrily.
[summary of the invention]
Embodiments provide a kind of relay and control method and a kind of relay controller, it is intended to solve how to enter one Step promotes the technical problem of reliability of relay selection, it is possible to make rising in user domain exhale vehicle communication terminal independently determine be No offer relays, and is greatly improved the reliability of relay selection.
First aspect, embodiments provides a kind of relay and control method, including: receive from several vehicle-mounted logical The relay selection request of letter terminal；According to the relay selection request received, calculate the signal from each vehicle communication terminal Corresponding received signal to noise ratio；According to described received signal to noise ratio, it is determined whether provide relaying for several vehicle communication terminals described Service.
In the above embodiment of the present invention, according to the relay selection request received, calculate from each vehicle-carrying communication eventually The step of the received signal to noise ratio corresponding to signal of end, specifically includes: the reception signal in asking according to described relay selection, performs Channel is estimated；The result estimated according to described channel, calculates from reception corresponding to the signal of described each vehicle communication terminal Signal to noise ratio.
In the above embodiment of the present invention, according to described received signal to noise ratio, it is determined whether provide the step of relay services, tool Body includes: determine maximum reception noise in the received signal to noise ratio that the signal from several vehicle communication terminals described is corresponding Ratio；Judge that whether described maximum received signal to noise ratio is more than or equal to predetermined signal to noise ratio；When judged result is for being, described some Individual vehicle communication terminal selects target terminal, provides relay services for described target terminal；When described judged result is no, Determine and do not provide described relay services for several vehicle communication terminals described.
In the above embodiment of the present invention, several vehicle communication terminals described select the step of target terminal, tool Body includes: select the received signal to noise ratio that signal is corresponding to meet the vehicle-mounted logical of predetermined condition in several vehicle communication terminals described Letter terminal is as described target terminal.
In the above embodiment of the present invention, described predetermined condition includes: only meet received signal to noise ratio maximum, received signal to noise ratio The priority of corresponding vehicle communication terminal is the highest, in the vehicle communication terminal of pre-determined bit, received signal to noise ratio is maximum before priority row In three conditions one or meet in described three conditions simultaneously multiple.
In the above embodiment of the present invention, the request of described relay selection includes: multi-source single relay many purposes communication for coordination please Ask；And/or the communication for coordination request of multi-source single relay monocular.
Second aspect, embodiments provides a kind of relay controller, including: receive unit, receive self-possessed The relay selection request of dry vehicle communication terminal；Received signal to noise ratio computing unit, according to the relay selection request received, meter Calculate from received signal to noise ratio corresponding to the signal of each vehicle communication terminal；Relay control unit, according to described received signal to noise ratio, Determine whether to provide relay services for several vehicle communication terminals described.
In the above embodiment of the present invention, described received signal to noise ratio computing unit specifically for: according to described relay selection Reception signal in request, performs channel and estimates, and the result estimated according to described channel, calculates from described each vehicle-mounted logical Believe the received signal to noise ratio that the signal of terminal is corresponding.
In the above embodiment of the present invention, described relay control unit includes: maximum signal to noise ratio determines unit, from institute State and the received signal to noise ratio that the signal of several vehicle communication terminals is corresponding determines maximum received signal to noise ratio；Judging unit, it is judged that Whether described maximum received signal to noise ratio is more than or equal to predetermined signal to noise ratio；Performance element, when judged result is for being, if described Dry vehicle communication terminal selects target terminal, provides relay services for described target terminal, when described judged result is no Time, determine and do not provide described relay services for several vehicle communication terminals described.
In the above embodiment of the present invention, when described judged result is for being, described performance element specifically for: described Several vehicle communication terminals select the received signal to noise ratio that signal is corresponding meet the vehicle communication terminal of predetermined condition as institute State target terminal.
In the above embodiment of the present invention, described predetermined condition includes: only meet received signal to noise ratio maximum, received signal to noise ratio The priority of corresponding vehicle communication terminal is the highest, in the vehicle communication terminal of pre-determined bit, received signal to noise ratio is maximum before priority row In three conditions one or meet in described three conditions simultaneously multiple.
In the above embodiment of the present invention, the request of described relay selection includes: multi-source single relay many purposes communication for coordination please Ask；And/or the communication for coordination request of multi-source single relay monocular.
The third aspect, is embodiments provided a kind of terminal, according to any one of above-mentioned second aspect Continue control device, and therefore, this terminal has the technology identical with the relay controller according to any one of technique scheme Effect, does not repeats them here.
By above technical scheme, impaired for the incorrect communication performance brought of the relay selection in correlation technique, in The problems such as the coverage that continues is limited, can calculate this and act connecing of the signal of exhaling vehicle communication terminal to receive several vehicle communication terminals Receive signal to noise ratio, and determine that this rises according to this received signal to noise ratio and exhale vehicle communication terminal independently to decide whether as several vehicle-carrying communications Terminal provides relay services so that the reliability of relay selection is substantially improved, it is simple to ensures the quality of communication performance and effectively expands Exhibition relay coverage.
[accompanying drawing explanation]
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below by embodiment required use attached Figure is briefly described, it should be apparent that, the accompanying drawing in describing below is only some embodiments of the present invention, for this area From the point of view of those of ordinary skill, on the premise of not paying creative work, it is also possible to obtain the attached of other according to these accompanying drawings Figure.
Fig. 1 shows the flow chart of relay and control method according to an embodiment of the invention；
Fig. 2 shows the flow chart of relay and control method according to another embodiment of the invention；
Fig. 3 shows the flow chart of relay and control method according to still a further embodiment；
Fig. 4 shows the block diagram of relay controller according to an embodiment of the invention；
Fig. 5 shows the block diagram of terminal according to an embodiment of the invention.
[detailed description of the invention]
In order to be better understood from technical scheme, below in conjunction with the accompanying drawings the embodiment of the present invention is retouched in detail State.
It will be appreciated that described embodiment be only the present invention a part of embodiment rather than whole embodiments.Base Embodiment in the present invention, those of ordinary skill in the art obtained under not making creative work premise all its Its embodiment, broadly falls into the scope of protection of the invention.
The term used in embodiments of the present invention is only merely for describing the purpose of specific embodiment, and is not intended to be limiting The present invention." a kind of ", " described " and " being somebody's turn to do " of singulative used in the embodiment of the present invention and appended claims It is also intended to include most form, unless context clearly shows that other implications.
Fig. 1 shows the flow chart of relay and control method according to an embodiment of the invention.
As it is shown in figure 1, the relay and control method that one embodiment of the present of invention is provided, including:
Step 102, receives the relay selection from several vehicle communication terminals and asks.
Wherein, several vehicle communication terminals have been to exhale vehicle communication terminal, exhale the vehicle communication terminal can for each Send relay selection request, can also monitor to rise from other simultaneously and exhale the relay selection of vehicle communication terminal to ask, namely Say, in multiple the user domain exhaling vehicle communication terminal to form, exhale vehicle communication terminal that other both can have been used to rise for each Exhale vehicle communication terminal as the link terminal of oneself, it is also possible to rise as other and exhale the link terminal of vehicle communication terminal to provide Relay services.
Step 104, according to the relay selection request received, calculates corresponding from the signal of each vehicle communication terminal Received signal to noise ratio.
Wherein, the signal exhaling vehicle communication terminal to provide by having other is wrapped in the relay selection request received, according to This signal can calculate this and rise and exhale vehicle communication terminal to receive each other to act the reception noise of the signal exhaling vehicle communication terminal Ratio.
Step 106, according to received signal to noise ratio, it is determined whether provide relay services for several vehicle communication terminals.
Wherein it is possible to according to this received signal to noise ratio, determine this rise exhale vehicle communication terminal whether provide relay services and Relay services is for Whom provided.
Technique scheme, relaying impaired for the incorrect communication performance brought of the relay selection in correlation technique covers The problems such as lid scope is limited, have employed and make rising in user domain exhale vehicle communication terminal independently to decide whether to provide the side of relaying Formula so that the reliability of relay selection is substantially improved, it is simple to ensure the quality of communication performance and effective expansion relays coverage.
It addition, the request of aforesaid relay selection includes: multi-source single relay many purposes communication for coordination is asked；And/or multi-source list The communication for coordination request of relaying monocular.It is to say, the relay and control of the embodiment of the present invention applies to the many mesh of multi-source single relay Communication for coordination and/or multi-source single relay monocular communication for coordination in, thus adapt to being actually needed of communication for coordination.
Fig. 2 shows the flow chart of relay and control method according to another embodiment of the invention.
As in figure 2 it is shown, relay and control method according to another embodiment of the invention, including:
Step 202, receives the relay selection from several vehicle communication terminals and asks.
Wherein, several vehicle communication terminals have been to exhale vehicle communication terminal, exhale the vehicle communication terminal can for each Send relay selection request, can also monitor to rise from other simultaneously and exhale the relay selection of vehicle communication terminal to ask, namely Say, in multiple the user domain exhaling vehicle communication terminal to form, exhale vehicle communication terminal that other both can have been used to rise for each Exhale vehicle communication terminal as the link terminal of oneself, it is also possible to rise as other and exhale the link terminal of vehicle communication terminal to provide Relay services.
Step 204, the reception signal in asking according to relay selection, perform channel and estimate.
Wherein, the method performing channel estimation includes but not limited to least-squares algorithm or least-mean-square error algorithm, obtains Must rise and exhale vehicle communication terminal SnWith SmBetween channel estimateM, n=1,2 ..., N, m ≠ n.
Step 206, the result estimated according to channel, calculate the reception from the signal of each vehicle communication terminal is corresponding and believe Make an uproar ratio.
Wherein, the computing formula of the received signal to noise ratio that the signal of each vehicle communication terminal is corresponding is:
γ S n , S m = | | h ^ S n , S m | | ÷ σ n 2
Equally, m, n=1,2 ..., N, m ≠ n.
Step 208, determines maximum reception in the received signal to noise ratio that the signal from several vehicle communication terminals is corresponding Signal to noise ratio.
Specifically, the received signal to noise ratio of several vehicle communication terminals can be done descending, so, rank the first Received signal to noise ratio be maximum received signal to noise ratio.
Step 210, it is judged that whether maximum received signal to noise ratio is more than or equal to predetermined signal to noise ratio, when judged result is for being, Enter step 212, when judged result is no, enter step 214.
Step 212, selects target terminal in several vehicle communication terminals, provides relay services for target terminal.
Wherein, if maximum received signal to noise ratio is more than or equal to predetermined signal to noise ratio, illustrate that several vehicle communication terminals have There is this to act the terminal exhaling vehicle communication terminal can provide effective relay services, therefore a conduct can be selected in these terminals The object of relay services is provided.
In the above embodiment of the present invention, the reception noise that signal is corresponding can be selected in several vehicle communication terminals Ratio meets the vehicle communication terminal of predetermined condition as target terminal.
Step 214, determines and does not provides relay services for several vehicle communication terminals.
Wherein, if maximum received signal to noise ratio is less than predetermined signal to noise ratio, illustrate that several vehicle communication terminals all cannot make Rising with this exhales vehicle communication terminal to relay.
Technique scheme, relaying impaired for the incorrect communication performance brought of the relay selection in correlation technique covers The problems such as lid scope is limited, have employed and make rising in user domain exhale vehicle communication terminal independently to decide whether to provide the side of relaying Formula so that the reliability of relay selection is substantially improved, it is simple to ensure the quality of communication performance and effective expansion relays coverage.
It should be added that, in order to enable relaying vehicle communication terminal to have good communication quality, at this The received signal to noise ratio requiring the signal only having vehicle communication terminal corresponding in bright embodiment meets predetermined condition, just determines that this is vehicle-mounted Communication terminal can use this to act the relay services exhaling vehicle communication terminal, i.e. determines that this acts the middle following the service exhaling vehicle communication terminal Business is effective to this vehicle communication terminal.By this technical scheme, it is possible to made to exhale vehicle communication terminal independently to decide whether There is provided relaying, say, that add the reliability of relay selection.
Aforesaid predetermined condition may include that and only meets the vehicle-carrying communication that received signal to noise ratio is maximum, received signal to noise ratio is corresponding The priority of terminal is the highest, before priority row in the vehicle communication terminal of pre-determined bit in maximum three conditions of received signal to noise ratio one Individual or meet in three conditions simultaneously multiple.
Predetermined condition includes but not limited to foregoing, it is also possible to be other conditions in addition as required, many The predetermined condition of sample is on the basis of the effectiveness ensureing link terminal so that the range of choice of link terminal is big, it is simple to suitable Answer the actual demand of user.Wherein, use which predetermined condition, can by exhale this vehicle communication terminal according to actual environment, The parameters such as performance are estimated, it is also possible to by user according to self needing actively selection in multiple predetermined condition.
It addition, the request of aforesaid relay selection includes: multi-source single relay many purposes communication for coordination is asked；And/or multi-source list The communication for coordination request of relaying monocular.It is to say, the relay and control of the embodiment of the present invention applies to the many mesh of multi-source single relay Communication for coordination and/or multi-source single relay monocular communication for coordination in, thus adapt to being actually needed of communication for coordination.
Fig. 3 shows the flow chart of relay and control method according to still a further embodiment.
As it is shown on figure 3, relay and control method according to still a further embodiment, including:
Step 302, starts dual domain cooperative relaying and selects.
Step 304, generates Che-car collaboration communication topology, and wherein, user terminal is to for { Si, Di, i ∈ (1, M), idle whole End is { Rj, i ∈ (1, N-2M).
Step 306, makes i=1.
Step 308, makes j=1.
Step 310, rises and exhales terminal SiBroadcastNon-occupied terminal RjReceive message
Step 312, channel is estimated to obtainCalculate and store signal to noise ratioAnd channel capacity? After calculating completes, make i=i+1, make j=j+1, and return step 310, until taken turns all user terminals to and non-occupied terminal.
Step 314, respectively to signal to noise ratio descending in units of user terminal, the non-occupied terminal ranked the first is constituted should Relay domain { the R of user terminal1, R2... }.
Step 316, makes n=1.
Step 318, makes m=2.
Step 320, rises and exhales terminal SnBroadcastRise and exhale terminal SmReceive message
Step 322, channel is estimated to obtainCalculate and store signal to noise ratioAfter calculating completes, make m =m+1, makes n=n+1, and returns step 320, until having taken turns all user terminals.
Step 324, user terminal is to signal to noise ratio descending sort.
Step 326, it is judged that rank the firstWhether less than γth, when judged result is for being, enter step 328, when judged result is no, enter step 330.
Step 328, constitutes relay domain cooperating relay and selects user set { Si, Di, i ∈ (1, M).
Step 330, this user terminal is the cooperating relay of corresponding user terminal, enters step 344.
Step 332, makes i=1.
Step 334, makes j=1.
Step 336, purpose terminal SiBroadcastNon-occupied terminal RjReceive message
Step 338, channel is estimated to obtainCalculate and store signal to noise ratioAnd channel capacity After calculating completes, make i=i+1, make j=j+1, and return step 336, until having taken turns all user terminals and purpose terminal.
Step 340, determines count down time
Step 342, the non-occupied terminal with the shortest countdown provides cooperating relay for corresponding user terminal.
Step 344, cooperating relay selects to terminate.
In the above-described embodiments, be divided into relay domain to build, user domain relays and relaying three parts in relay domain, wherein:
One, the part that relay domain builds specifically includes herein below:
In certain region, random distribution has N number of vehicle being configured with vehicle communication terminal (i.e. non-occupied terminal), wherein has M pair It is right that vehicle communication terminal (i.e. user terminal) configuration information sends and receives, and the vehicle communication terminal initiating call request is constituted The vehicle communication terminal exhaling vehicle communication terminal group and the information of reception constitutes purpose vehicle communication terminal group, is designated as { Si, Di, i ∈ (1, M), remaining N-2M vehicle communication terminal noncall request, constitute idle vehicle communication terminal group, be designated as { Rj, i ∈ (1, N-2M)。
Rise and exhale terminal distributed broadcast relay domain to build messageI ∈ (1, M), non-occupied terminal RjReception signal be:
y S i , R j R D M = h S i , R j x S i R D M + n S i , R j
Wherein,For non-occupied terminal RjTerminal S is exhaled with risingiBetween channel gain,Be average be 0, side Difference isWhite Gaussian noise.
Wherein, use least-squares algorithm or least-mean-square error algorithm to perform channel to estimate, it is thus achieved that idle vehicle-carrying communication Terminal RjVehicle communication terminal S is exhaled with risingiBetween channel estimateAnd then calculate connecing of each idle vehicle communication terminal Receipts signal to noise ratio:
γ S i , R j = | | h ^ S i , R j | | ÷ σ n 2
Specifically, exhale vehicle communication terminal to construct respective relay domain, rise and exhale vehicle communication terminal broadcast transmission for all Relay domain builds message, and idle vehicle communication terminal is intercepted, and can be properly received and decode in exhaling vehicle communication terminal to send Continue territory build message idle vehicle communication terminal constitute decoding set, and by channel estimate has obtained exhale vehicle communication terminal and The channel capacity of the link of idle vehicle communication terminal, the idle vehicle communication terminal in decoding set is maximum according to received signal to noise ratio Criterion selection one is exhaled vehicle communication terminal to provide the candidate of collaboration communication to rise as it and is exhaled vehicle communication terminal, have selected phase With rise exhale vehicle communication terminal available free vehicle communication terminal constitute this and act the relay domain exhaling vehicle communication terminal.
Assume that vehicle communication terminal received signal to noise ratio thresholding is γth, meetIdle vehicle-carrying communication eventually End constitutes decoding set, estimate the channel capacity of link exhaling vehicle communication terminal to arrive free time vehicle communication terminal:
C S i , R j = log 2 ( 1 + γ S i , R j )
Wherein, i ∈ (1, M), i ∈ (1, N-2M).
To in decoding set the received signal to noise ratio of available free vehicle communication terminal according to descending, the free time ranked the first Vehicle communication terminal selects corresponding rising to exhale vehicle communication terminal to provide the candidate of cooperation to rise as it and exhales vehicle communication terminal, choosing Select identical the available free vehicle communication terminal of institute exhaling vehicle communication terminal and constitute relay domain.
Two, user domain relays and specifically includes herein below:
Exhale vehicle communication terminal to send cooperating relay for all and select request message, and monitor rise from other exhale vehicle-mounted logical The cooperating relay that letter terminal sends selects request message, rises and exhales vehicle communication terminal Sn, timesharing broadcast collaboration relay selection is asked MessageOther rises exhales vehicle communication terminal SmReceive, m, n=1,2 ..., N, m ≠ n.It receives signal:
y S n , R m R S R = h S n , S m x S n R S R + n S n , S m
Wherein,It has been to exhale vehicle communication terminal SnWith SmBetween channel gain,Be average be 0, Variance isWhite Gaussian noise.
Exhale vehicle communication terminal to perform channel estimation according to receiving signal, specifically, least square can be used to calculate for each Method or least-mean-square error algorithm perform channel and estimate, it is thus achieved that rise and exhale vehicle-carrying communication S at endnWith SmBetween channel estimateAnd then calculate each the received signal to noise ratio exhaling vehicle communication terminal:
γ S n , S m = | | h ^ S n , S m | | ÷ σ n 2
M, n=1,2 ..., N, m ≠ n.
Vehicle communication terminal is exhaled to index descending rising in addition to oneself according to received signal to noise ratio, according to maximum noise Than determining whether provide cooperating relay and for Whom provide cooperating relay, at most select one to rise and exhale vehicle communication terminal to provide for it Cooperating relay.
Received signal to noise ratio is done descending, if the received signal to noise ratio ranked the firstExhale for all Vehicle communication terminal refusal rises for other exhales vehicle communication terminal to relay, and otherwise, exhaling that received signal to noise ratio ranks the first is vehicle-mounted Communication terminal is chosen as rising of correspondence and exhales vehicle communication terminal to provide relaying.
Exhale vehicle communication terminal to send cooperating relay to purpose vehicle communication terminal for each and select result.
Three, the interior relaying of relay domain specifically includes herein below:
Vehicle communication terminal is exhaled for not finding cooperating relay to rise in the user domain cooperating relay choice phase, then in execution The territory cooperating relay that continues selects.
Purpose vehicle communication terminal sends cooperating relay and selects to control message to not finding rising of cooperating relay to exhale vehicle-mounted leading to Available free vehicle communication terminal in letter terminal relay territory, purpose vehicle communication terminal DiThe relay selection of broadcast transmission controls MessageDo not find cooperating relay rise exhale vehicle communication terminal relay domain institute available free vehicle communication terminal reception believe Number be:
y R j , D i R S C = h R j , D i x D i R S C + n R j , D i
Wherein, i ∈ (1, M), i ∈ (1, N-2M),For the purpose of vehicle communication terminal DiWith idle vehicle-carrying communication eventually End RjBetween channel gain,Be average be 0, variance beWhite Gaussian noise.
Relay domain can be properly received the idle car of the cooperating relay selection control message from purpose vehicle communication terminal Carry communication terminal, estimate to obtain the channel capacity of purpose vehicle communication terminal-free time vehicle communication terminal link by channel, respectively From according to exhale vehicle communication terminal to the link of idle vehicle communication terminal channel capacity and purpose vehicle communication terminal to The channel capacity minimax criterion of the link of idle vehicle communication terminal determines count down time, rises and exhales vehicle communication terminal to arrive The link of the channel capacity of the link of idle vehicle communication terminal and purpose vehicle communication terminal to free time vehicle communication terminal The idle vehicle communication terminal count down time of minimum channel capacity maximum is the shortest.
Specifically, least-squares algorithm or least-mean-square error algorithm can be used to perform channel estimate, it is thus achieved that purpose is vehicle-mounted Communication terminal DiWith idle vehicle communication terminal RjBetween channel estimateCalculate connecing of each idle vehicle communication terminal Receipts signal to noise ratio:
γ R j , D i = | | h ^ R j , D i | | ÷ σ n 2
ForIdle vehicle communication terminal, the idle vehicle communication terminal-purpose vehicle-carrying communication of estimation The channel capacity of terminal links:
C R j , D i = log 2 ( 1 + γ R j , D i )
Wherein, i ∈ (1, M), i ∈ (1, N-2M).
Select to exhale vehicle communication terminal to arrive the channel capacity of link and the purpose vehicle-carrying communication of idle vehicle communication terminal Terminal to the idle vehicle communication terminal of the channel capacity minimax of the link of idle vehicle communication terminal as this relay domain In act the relaying exhaling vehicle communication terminal, determine count down time:
T S i = K / m a x { m i n ( C S i , R j , C R j , D i ) }
So, have in the idle vehicle communication terminal of the shortest count down time is selected as this relay domain rise exhale vehicle-mounted The cooperating relay of communication terminal.
Finally, cooperative relaying transmission can be carried out, specifically, when selected idle vehicle communication terminal count down time then, All exhale vehicle communication terminal and selected idle vehicle communication terminal to be sent by orthogonal channel as cooperating relay simultaneously and Forwarding difference to rise exhales vehicle communication terminal information to purpose vehicle communication terminal.
Fig. 4 shows the block diagram of relay controller according to an embodiment of the invention.
As shown in Figure 4, relay controller 400 according to an embodiment of the invention, including: receive unit 402, connect Receive signal to noise ratio computing unit 404 and relay control unit 406.
Specifically, receive unit 402 and ask for receiving the relay selection from several vehicle communication terminals.
Wherein, several vehicle communication terminals have been to exhale vehicle communication terminal, exhale the vehicle communication terminal can for each Send relay selection request, can also monitor to rise from other simultaneously and exhale the relay selection of vehicle communication terminal to ask, namely Say, in multiple the user domain exhaling vehicle communication terminal to form, exhale vehicle communication terminal that other both can have been used to rise for each Exhale vehicle communication terminal as the link terminal of oneself, it is also possible to rise as other and exhale the link terminal of vehicle communication terminal to provide Relay services.
Received signal to noise ratio computing unit 404, for according to the relay selection request received, calculates from each vehicle-mounted logical Believe the received signal to noise ratio that the signal of terminal is corresponding.
Wherein, the signal exhaling vehicle communication terminal to provide by having other is wrapped in the relay selection request received, according to This signal can calculate this and rise and exhale vehicle communication terminal to receive each other to act the reception noise of the signal exhaling vehicle communication terminal Ratio.
Relay control unit 406 is for according to received signal to noise ratio, it is determined whether in providing for several vehicle communication terminals Following the service is engaged in.
Wherein it is possible to according to this received signal to noise ratio, determine this rise exhale vehicle communication terminal whether provide relay services and Relay services is for Whom provided.
Technique scheme, relaying impaired for the incorrect communication performance brought of the relay selection in correlation technique covers The problems such as lid scope is limited, have employed and make rising in user domain exhale vehicle communication terminal independently to decide whether to provide the side of relaying Formula so that the reliability of relay selection is substantially improved, it is simple to ensure the quality of communication performance and effective expansion relays coverage.
In the above embodiment of the present invention, received signal to noise ratio computing unit 404 specifically for: according to relay selection ask in Reception signal, perform channel and estimate, and the result estimated according to channel, calculate from the signal pair of each vehicle communication terminal The received signal to noise ratio answered.
Wherein, the method performing channel estimation includes but not limited to least-squares algorithm or least-mean-square error algorithm, obtains Must rise and exhale vehicle communication terminal SnWith SmBetween channel estimateM, n=1,2 ..., N, m ≠ n, each vehicle-carrying communication The computing formula of the received signal to noise ratio that the signal of terminal is corresponding is:
γ S n , S m = | | h ^ S n , S m | | ÷ σ n 2
In the above embodiment of the present invention, relay control unit 406 includes: maximum signal to noise ratio determines unit 4062, judges Unit 4064 and performance element 4066.
Specifically, maximum signal to noise ratio determines that unit 4062 is for corresponding at the signal from several vehicle communication terminals Received signal to noise ratio determines maximum received signal to noise ratio, i.e. the received signal to noise ratio of several vehicle communication terminals can be descending row Row, so, the received signal to noise ratio ranked the first is maximum received signal to noise ratio.
Judging unit 4064 is used for judging that whether maximum received signal to noise ratio is more than or equal to predetermined signal to noise ratio.
Performance element 4066, for when judged result is for being, selects target terminal in several vehicle communication terminals, There is provided relay services for target terminal, when judged result is no, determine following the service in not providing for several vehicle communication terminals Business.
Wherein, if maximum received signal to noise ratio is more than or equal to predetermined signal to noise ratio, illustrate that several vehicle communication terminals have There is this to act the terminal exhaling vehicle communication terminal can provide effective relay services, therefore a conduct can be selected in these terminals The object of relay services is provided.If maximum received signal to noise ratio is less than predetermined signal to noise ratio, several vehicle communication terminals are described all This cannot be used to rise exhales vehicle communication terminal to relay.
In the above embodiment of the present invention, the reception noise that signal is corresponding can be selected in several vehicle communication terminals Ratio meets the vehicle communication terminal of predetermined condition as target terminal.
In the above embodiment of the present invention, when judged result is for being, performance element 4066 specifically for: at several cars Carry and communication terminal selects the received signal to noise ratio that signal is corresponding meet the vehicle communication terminal of predetermined condition as target terminal.
It should be added that, in order to enable relaying vehicle communication terminal to have good communication quality, at this The received signal to noise ratio requiring the signal only having vehicle communication terminal corresponding in bright embodiment meets predetermined condition, just determines that this is vehicle-mounted Communication terminal can use this to act the relay services exhaling vehicle communication terminal, i.e. determines that this acts the middle following the service exhaling vehicle communication terminal Business is effective to this vehicle communication terminal.By this technical scheme, it is possible to made to exhale vehicle communication terminal independently to decide whether There is provided relaying, say, that add the reliability of relay selection.
Aforesaid predetermined condition may include that and only meets the vehicle-carrying communication that received signal to noise ratio is maximum, received signal to noise ratio is corresponding The priority of terminal is the highest, before priority row in the vehicle communication terminal of pre-determined bit in maximum three conditions of received signal to noise ratio one Individual or meet in three conditions simultaneously multiple.
Predetermined condition includes but not limited to foregoing, it is also possible to be other conditions in addition as required, many The predetermined condition of sample is on the basis of the effectiveness ensureing link terminal so that the range of choice of link terminal is big, it is simple to suitable Answer the actual demand of user.Wherein, use which predetermined condition, can by exhale this vehicle communication terminal according to actual environment, The parameters such as performance are estimated, it is also possible to by user according to self needing actively selection in multiple predetermined condition.
It addition, the request of aforesaid relay selection includes: multi-source single relay many purposes communication for coordination is asked；And/or multi-source list The communication for coordination request of relaying monocular.It is to say, the relay and control of the embodiment of the present invention applies to the many mesh of multi-source single relay Communication for coordination and/or multi-source single relay monocular communication for coordination in, thus adapt to being actually needed of communication for coordination.
Fig. 5 shows the block diagram of terminal according to an embodiment of the invention.
As it is shown in figure 5, terminal 500 according to an embodiment of the invention, exhale vehicle communication terminal, including Fig. 4 for rising The relay controller 400 illustrated, therefore, this terminal 500 has the technology identical with the relay controller 400 shown in Fig. 4 Effect, does not repeats them here.
Technical scheme is described in detail, by technical scheme, for relevant above in association with accompanying drawing The problems such as the incorrect communication performance brought of relay selection in technology is impaired, relay coverage is limited, have employed and make user Rising in territory exhales vehicle communication terminal independently to decide whether to provide the mode of relaying so that the reliability of relay selection significantly carries Rise, it is simple to ensure the quality of communication performance and effective expansion relays coverage.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies Change, equivalent, improvement etc., should be included within the scope of the present invention.
Should be appreciated that term "and/or" used herein is only a kind of incidence relation describing affiliated partner, represent Three kinds of relations, such as, A and/or B can be there are, can represent: individualism A, there is A and B, individualism B these three simultaneously Situation.It addition, character "/" herein, typically represent forward-backward correlation to as if the relation of a kind of "or".
Depend on linguistic context, word as used in this " if " can be construed to " ... time " or " when ... Time " or " in response to determining " or " in response to detection ".Similarly, depend on linguistic context, phrase " if it is determined that " or " if detection (condition of statement or event) " " when determining " or " in response to determining " can be construed to or " when the detection (condition of statement Or event) time " or " in response to detection (condition of statement or event) ".
It should be noted that terminal involved in the embodiment of the present invention can include but not limited to personal computer (Personal Computer, PC), personal digital assistant (Personal Digital Assistant, PDA), wireless handheld Equipment, panel computer (Tablet Computer), mobile phone, MP3 player, MP4 player etc..
In several embodiments provided by the present invention, it should be understood that disclosed system, apparatus and method, permissible Realize by another way.Such as, device embodiment described above is only schematically, such as, and described unit Dividing, be only a kind of logic function and divide, actual can have other dividing mode, such as, multiple unit or group when realizing Part can in conjunction with or be desirably integrated into another system, or some features can be ignored, or does not performs.Another point, shown Or the coupling each other discussed or direct-coupling or communication connection can be indirect by some interfaces, device or unit Coupling or communication connection, can be electrical, machinery or other form.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it is also possible to It is that unit is individually physically present, it is also possible to two or more unit are integrated in a unit.Above-mentioned integrated list Unit both can realize to use the form of hardware, it would however also be possible to employ hardware adds the form of SFU software functional unit and realizes.
The above-mentioned integrated unit realized with the form of SFU software functional unit, can be stored in an embodied on computer readable and deposit In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions with so that a computer Device (can be personal computer, server, or network equipment etc.) or processor (Processor) perform the present invention each The part steps of method described in embodiment.And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory (Read- Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or CD etc. various The medium of program code can be stored.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention Within god and principle, any modification, equivalent substitution and improvement etc. done, within should be included in the scope of protection of the invention.

Claims (12)

1. a relay and control method, it is characterised in that including:
Receive the relay selection from several vehicle communication terminals to ask；
According to the relay selection request received, calculate from received signal to noise ratio corresponding to the signal of each vehicle communication terminal；
According to described received signal to noise ratio, it is determined whether provide relay services for several vehicle communication terminals described.
Relay and control method the most according to claim 1, it is characterised in that according to the relay selection request received, meter Calculate the step from received signal to noise ratio corresponding to the signal of each vehicle communication terminal, specifically include:
Reception signal in asking according to described relay selection, performs channel and estimates；
The result estimated according to described channel, calculates from reception noise corresponding to the signal of described each vehicle communication terminal Ratio.
Relay and control method the most according to claim 1 and 2, it is characterised in that according to described received signal to noise ratio, determines and is The step of no offer relay services, specifically includes:
Maximum received signal to noise ratio is determined in the received signal to noise ratio that the signal from several vehicle communication terminals described is corresponding；
Judge that whether described maximum received signal to noise ratio is more than or equal to predetermined signal to noise ratio；
When judged result is for being, several vehicle communication terminals described selects target terminal, carries for described target terminal For relay services；
When described judged result is no, determines and do not provide described relay services for several vehicle communication terminals described.
Relay and control method the most according to claim 3, it is characterised in that select in several vehicle communication terminals described Select the step of target terminal, specifically include:
The received signal to noise ratio that signal is corresponding is selected to meet the vehicle-carrying communication of predetermined condition in several vehicle communication terminals described Terminal is as described target terminal.
Relay and control method the most according to claim 4, it is characterised in that described predetermined condition includes: only meet and receive The priority of the vehicle communication terminal that signal to noise ratio is maximum, received signal to noise ratio is corresponding is the highest, vehicle-mounted the leading to of the front pre-determined bit of priority row In letter terminal one in maximum three conditions of received signal to noise ratio or meet in described three conditions simultaneously multiple.
Relay and control method the most according to claim 4, it is characterised in that the request of described relay selection includes:
Multi-source single relay many purposes communication for coordination is asked；And/or
The communication for coordination request of multi-source single relay monocular.
7. a relay controller, it is characterised in that including:
Receive unit, receive the relay selection from several vehicle communication terminals and ask；
Received signal to noise ratio computing unit, according to the relay selection request received, calculates the letter from each vehicle communication terminal Number corresponding received signal to noise ratio；
Relay control unit, according to described received signal to noise ratio, it is determined whether provide relaying for several vehicle communication terminals described Service.
Relay controller the most according to claim 7, it is characterised in that described received signal to noise ratio computing unit is specifically used In:
Reception signal in asking according to described relay selection, performs channel and estimates, and the result estimated according to described channel, meter Calculate from received signal to noise ratio corresponding to the signal of described each vehicle communication terminal.
9. according to the relay controller described in claim 7 or 8, it is characterised in that described relay control unit includes:
Maximum signal to noise ratio determines unit, in the received signal to noise ratio that the signal from several vehicle communication terminals described is corresponding really Fixed maximum received signal to noise ratio；
Judging unit, it is judged that whether described maximum received signal to noise ratio is more than or equal to predetermined signal to noise ratio；
Performance element, when judged result is for being, selects target terminal, for described mesh in several vehicle communication terminals described Mark terminal provides relay services, when described judged result is no, determines and does not provides institute for several vehicle communication terminals described State relay services.
Relay controller the most according to claim 9, it is characterised in that when described judged result is for being, described in hold Row unit specifically for:
The received signal to noise ratio that signal is corresponding is selected to meet the vehicle-carrying communication of predetermined condition in several vehicle communication terminals described Terminal is as described target terminal.
11. relay controllers according to claim 10, it is characterised in that described predetermined condition includes: only meet and connect The priority of the vehicle communication terminal that receipts signal to noise ratio is maximum, received signal to noise ratio is corresponding is the highest, priority arranges the vehicle-mounted of front pre-determined bit In communication terminal one in maximum three conditions of received signal to noise ratio or meet in described three conditions simultaneously multiple.
12. relay controllers according to claim 10, it is characterised in that the request of described relay selection includes:
Multi-source single relay many purposes communication for coordination is asked；And/or
The communication for coordination request of multi-source single relay monocular.
CN201610716114.5A 2016-08-24 2016-08-24 Relay control method and device Pending CN106332218A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109687900A (en) * 2019-02-28 2019-04-26 重庆大学 A kind of air-ground integrated coverage enhancement method and system in the day of automatic adjusument

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101790204A (en) * 2010-02-01 2010-07-28 北京邮电大学 Relay selection method giving consideration to channel conditions and traffic states in cooperative communication system
CN101990324A (en) * 2009-07-30 2011-03-23 华为技术有限公司 Method for actively selecting user terminal in relay system and base station
CN103458523A (en) * 2012-06-01 2013-12-18 北京大学 Vehicle-mounted communication system wireless resource scheduling method
CN104936267A (en) * 2014-03-20 2015-09-23 中国电信股份有限公司 Method, base station and system used for selecting relay terminal
CN105142199A (en) * 2015-07-23 2015-12-09 扬州大学 Relay selection method based on threshold and maximum safe capacity
CN105307216A (en) * 2015-06-26 2016-02-03 哈尔滨工业大学深圳研究生院 LTE-based radio resource allocation method of Internet of vehicles
CN105517096A (en) * 2015-09-30 2016-04-20 河南科技大学 Relay selection method for multi-relay amplification forwarding collaborative network
CN105554817A (en) * 2015-12-16 2016-05-04 广西师范大学 Load equalized relay selection method
CN105792310A (en) * 2016-03-04 2016-07-20 哈尔滨工业大学深圳研究生院 Relay selection algorithm based on LTE Internet of vehicles

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101990324A (en) * 2009-07-30 2011-03-23 华为技术有限公司 Method for actively selecting user terminal in relay system and base station
CN101790204A (en) * 2010-02-01 2010-07-28 北京邮电大学 Relay selection method giving consideration to channel conditions and traffic states in cooperative communication system
CN103458523A (en) * 2012-06-01 2013-12-18 北京大学 Vehicle-mounted communication system wireless resource scheduling method
CN104936267A (en) * 2014-03-20 2015-09-23 中国电信股份有限公司 Method, base station and system used for selecting relay terminal
CN105307216A (en) * 2015-06-26 2016-02-03 哈尔滨工业大学深圳研究生院 LTE-based radio resource allocation method of Internet of vehicles
CN105142199A (en) * 2015-07-23 2015-12-09 扬州大学 Relay selection method based on threshold and maximum safe capacity
CN105517096A (en) * 2015-09-30 2016-04-20 河南科技大学 Relay selection method for multi-relay amplification forwarding collaborative network
CN105554817A (en) * 2015-12-16 2016-05-04 广西师范大学 Load equalized relay selection method
CN105792310A (en) * 2016-03-04 2016-07-20 哈尔滨工业大学深圳研究生院 Relay selection algorithm based on LTE Internet of vehicles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109687900A (en) * 2019-02-28 2019-04-26 重庆大学 A kind of air-ground integrated coverage enhancement method and system in the day of automatic adjusument

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