CN105228237B - The unbalanced relaying motivational techniques of link are based in coordination downlink link - Google Patents

The unbalanced relaying motivational techniques of link are based in coordination downlink link Download PDF

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CN105228237B
CN105228237B CN201510645011.XA CN201510645011A CN105228237B CN 105228237 B CN105228237 B CN 105228237B CN 201510645011 A CN201510645011 A CN 201510645011A CN 105228237 B CN105228237 B CN 105228237B
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user
candidate relay
base station
purpose user
trunk subscriber
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CN105228237A (en
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李钊
蔡沈锦
肖丽媛
丁汉清
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Xidian University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/46—TPC being performed in particular situations in multi hop networks, e.g. wireless relay networks

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  • Computer Networks & Wireless Communication (AREA)
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  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a kind of for coordination downlink communication based on the unbalanced relaying motivational techniques of link, mainly solves the problems, such as that existing relaying exciting technique cannot accurately obtain return excitation and not can guarantee the transmission performance of user, implementation is：Firstly, adjusting the transmission power of trunk subscriber according to the demand of beehive network system, the position of bottleneck and size in the two-hop link to be formed are forwarded via trunk subscriber with control, to guarantee the transmission performance of purpose user and the response rate of control trunk subscriber；On this basis, it is motivated as the return for participating in cooperation to trunk subscriber, it gives the data rate difference of two-hop link to the transmission that trunk subscriber carries out data, is motivated with being determined instant return to trunk subscriber on the basis of guaranteeing purpose user transmission performance.The present invention realizes the promotion of system spectral efficiency and relays the improvement of energy efficiency, improves system transmission performance, can be used for coordination downlink communication link.

Description

The unbalanced relaying motivational techniques of link are based in coordination downlink link
Technical field
The invention belongs to fields of communication technology, more particularly to one kind to be based on the unbalanced relaying motivational techniques of link, can use Return excitation is carried out to the relay node for participating in cooperation in coordination downlink communication link.
Background technique
Traditional cellular communication system realizes MPS process, the flexibility ratio and coverage area of network structure centered on base station There is certain limitation.As wireless multimedia service is increasing, only the business presentation mode centered on base station will be difficult to Meet the business demand of user under various circumstances.Next-Generation Wireless Communication Systems 5G is by a large amount of relay node and equipment to setting Standby D2D communication link introduces cellular system to enhance the flexibility and coverage area of network structure, and the cooperation of equipment room will be more Add universal.Stationary nodes in cellular communication system, i.e. relay station and mobile node can serve as relaying and participate in collaboration communication, lead to Letter mode includes amplification forwarding AF and decoding forwarding DF.Stationary nodes only carry out the forwarding of data, mobile node there are also itself Communication requirement.Relative to fixed relay, the mobile relay wireless transmission of more flexible, range of choice more extensively, to complexity with position The advantages that environmental suitability is more preferable.But in the communication scenes using mobile relay, relay node is consumed due to participating in cooperative association Energy will be unable to maintain good cooperation relation if compensated without the return of reasonable resource, even result in mobile Cooperation is participated in after refusal.
There are different relaying incentive mechanisms in different type network, it is mainly the following in the prior art：
He Q,Wu D,Khosla P.SORI:a secure and objective reputation-based incentive scheme for ad-hoc networks[C]//IEEE Wireless Communications and Networking Conference(WCNC).Atlanta Georgia:IEEE,2004:825-830 is proposed based on objective The incentive mechanism of reputation and safety, the mechanism are by calculating the practical data packet number and even higher level of node forwarded of adjacent node The ratio-dependent relay node reputation value for the quantity for needing to forward, the node refusal to reputation value lower than thresholding forward data for it As punishment.But such return method difficult management and overhead based on reputation value are larger.
Gueguen C,Rachedi A,Guizani M.Incentive scheduler algorithm for cooperation and coverage extension in wireless networks[J].IEEE Transactions on Vehicular Technology,2013,62(2):797-808 proposes the excitation scheduling for cooperating and covering extension Algorithm, the algorithm serve as the mobile station dispatch weight of relaying and increase probability that it is dispatched by base station as the sharp of return to increase Encourage mechanism；But such rewarding mechanism based on scheduling probability compensation is restricted by other mobile communications quality in cellular system, Relaying when the user of bad channel quality in system is more possibly can not be returned.
Su W,Matyjas J D,Batalama S.Active cooperation between primary users and cognitive radio users in cognitive ad-hoc networks[C]//IEEE Acoustics Speech and Signal Processing(ICASSP).Dallas:IEEE,2010:3174-3177 is proposed a kind of primary The two stages cooperation transmission mechanism that family cooperates with cognitive user, the mechanism using a part of authorized bandwidth give cognitive user as Cognitive user participates in the motivational techniques of cooperation return.However, such energisation mode for selling frequency domain resource will affect transferor certainly The data of body are transmitted.
Existing research unbalanced to link concentrates on eliminating bottleneck, such as Zhao Li, Xinyi Kong, Jiandong Li.Adaptive cooperative transmission and spectrum sharing in MIMO- CCRN[C]//IEEE Personal,Indoor,and Mobile Radio Communication(PIMRC) .Washington DC:IEEE,2014:1508-1513 is proposed to divide by time slot and is eliminated link bottleneck to realize adaptive association Make transmission and frequency spectrum share, improves end-to-end transmission performance, but the improvement of its transmission performance for only considering purpose user And have ignored the return of relaying.
Summary of the invention
It is uneven based on link in a kind of collaboration communication it is an object of the invention in view of the above shortcomings of the prior art, provide The relaying motivational techniques of weighing apparatus, to give time that relay node rationally determines on the basis of not influencing purpose user's transmission performance Report, the performance boost in terms of realizing system spectral efficiency and relaying energy efficiency.
Technical thought of the invention is using the disequilibrium of the two-hop link of coordination downlink, according to relaying return amount and mesh The demand adjustment repeat transmitted power of user's transmission performance will be present in the bottleneck of the first jump be transferred to the second jump or expansion It is present in the bottleneck of the second jump greatly, is used for trunk subscriber itself with the data rate difference of the second hop link to jumping first The transmission of data, as the return for participating in cooperation to relaying.
According to above-mentioned thinking, the present invention realizes that step includes as follows：
(1) in the transmission time slot t of any one purpose user scheduling, base station BS in cellular network is to purpose user MSdSend the signal for having training sequence, purpose user MSdSignal estimates its channel matrix h based on the receiveds,d, and press formulaCalculate itself and the data achievable rate when direct communication of base stationAnd by the achievable rateFeed back to base station BS；
(2) using the mobile station in cellular network in addition to purpose user as candidate relay user, then as follows from Candidate relay userOne trunk subscriber MS of middle selectionl：
(2a) calculation base station BS is to candidate relay userReachable data rateWith candidate relay userIt arrives Purpose user MSdReachable data rate
Wherein,Subscript x indicate to be sent to the data of purpose user, z indicates the data for being sent to trunk subscriber, PT Indicate base station transmitting power,For the noise variance of additive white Gaussian noise；For candidate relay userWith base station BS The channel matrix of the candidate relay user and base station that are obtained in interactive process；PRFor the transmission power that candidate relay user uses,For candidate relay userWith purpose user MSdThe candidate relay user obtained in interactive process is with purpose user's Channel matrix；
(2b) calculates purpose user MS according to the calculated result of step (2a)dAcquisition is forwarded via candidate relay user Data rateWith candidate relay userResponse rateResponse rateIt is to participate in cooperating to candidate relay user The compensation of resource consumption is the difference of two-hop link rate：
(2c) adjusts candidate relay according to the calculated result of step (2b)Transmission power PRValue, under Formula calculates candidate relay userObjective functionMaximum value, base station BS record the maximum value with And objective function candidate relay user when taking the maximum valueThe transmission power P usedRValue：
s.t.s1:
s2:
s3:
s4:
s5:0≤c≤1
s6:
Wherein,For rate improvement amount distribution factor,WhenWhen, expression can give candidate relay's Maximal rewards areAnd to purpose user MSdIt only needs to guaranteeIt is not less thanWhenWhen, indicating will All give purpose user MSd；
C is relaying excitation factor, and c ∈ [0,1], as c=0, expression makes purpose user MSdRate maximize；Work as c= When 1, indicate guaranteeing purpose user MSdMake candidate relay while transmission performanceReturn maximization, the two factors Value is required to determine by base station BS according to beehive network system；
For candidate relay user's maximum transmission power, value is provided with reference to 3GPP standard；
Maximum transmission power is used for candidate relay userWhen purpose user MSdTurn via candidate relay user Send out the maximum data rate obtained；
(2d) repeats step (2a)~step (2c), in all candidate relay usersTarget function value calculate complete Afterwards, base station BS selects to make the maximum candidate relay user of target function value as trunk subscriber MSl, and used from base station BS to relaying Family MSlSend the transmission power P that information notifies it that should useR *；
(3) optimal trunk subscriber MS is being selectedlAfterwards, the first jump transmission time T is divided into two periods by base station BS, the In one period, base station BS is to trunk subscriber MSlSend purpose user MSdExpected data, trunk subscriber MSlAfter receiving the data Carry out decoding forwarding；Within the second period, base station BS is to trunk subscriber MSlIt sends trunk subscriber itself and wishes the data obtained, Trunk subscriber MSlThe data are received；
(4) in the transmission time slot (t+1) of next purpose user scheduling, step (1a)~step (1c) is repeated；
(5) in the transmission time slot (t+i) that the user of subsequent i-th of mesh dispatches, step (1a)~step is repeated (1c), 2≤i≤n, n are total timeslot number of cellular network existence.
The present invention is compared with the prior art, and has following features：
1, provided by the invention to utilize the bottle generated due to link imbalance based on the unbalanced relaying motivational techniques of link Neck, the data-set that relay node can obtain itself can be as the compensation to its resource consumption.And according to cellular network The demand of system controls the position of bottleneck and size by adjusting relay node transmission power, to guarantee destination node Transmission performance and control relay node return amount improve relaying energy efficiency to improve system spectral efficiency；
2, the present invention compares traditional relaying motivational techniques, on the basis of guaranteeing purpose user information transmission performance in Instant compensation mechanism that is a kind of easy to operate and determining is provided after node.
3, provided by the invention to be based on the unbalanced relaying motivational techniques of link, while elimination gap pair in after progress Return spread realizes the reasonable return of channel resource made full use of with relay node, the dimension of more conducively good cooperation relation It holds.
Detailed description of the invention
Fig. 1 is the communication system architecture schematic diagram that the present invention uses；
Fig. 2 is implementation flow chart of the invention；
Fig. 3 is the distance D with the present invention to purpose user and base stationdCandidate relay regional scope when taking different value is imitative True figure, wherein Fig. 3 (a) is purpose user MSdWith base station distance DdFor the candidate relay regional scope determined when 1.90Km, Fig. 3 It (b) is purpose user MSdWith base station distance DdFor the candidate relay regional scope determined when 2.00Km；
Fig. 4 is with the present invention to distribution factorWhen taking different value, purpose user spectrum efficiency and trunk subscriber frequency spectrum effect Rate with excitation factor c situation of change analogous diagram；
Fig. 5 is to carry out relaying excitation when taking different value to candidate relay user's number with the present invention and swash with without relaying The system spectral efficiency encouraged compares analogous diagram；
Fig. 6 is with the present invention to distribution factorWhen taking different value, repeat transmitted power adjustable is whole solid with repeat transmitted power The relaying energy efficiency of timing compares analogous diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, in conjunction with the accompanying drawings and embodiments to this hair It is bright to be described in further detail, it should be understood that described herein specific examples are only used to explain the present invention, and does not have to It is of the invention in limiting.
The embodiment of the present invention is illustrated based on the coordination downlink communication system of single cell, it is desirable to provide one kind is based on link The method of unbalanced relaying excitation.With reference to the accompanying drawing and specific embodiment further retouches application principle of the invention It states.
Referring to Fig.1, the system model that the present invention uses is single cell cooperative downlink communication system, includes a base in system Stand BS, and K+1 mobile station MS, all mobile stations configure single antenna.Mobile station positioned at cell edge works as forward pass in base station The defeated period is scheduled as purpose user MSd.All mobile stations can be used as trunk subscriber and purpose user helped to forward data, in After user using decoding forwarding, and work in semiduplex mode.Purpose user accesses channel in a manner of time division multiple acess TDMA.? When carrying out data transmission, by transmission time slot TsTwo equal stages of duration are divided into, is formed and transmits rank via the double bounce of relaying Section：Base station and trunk subscriber direct communication are in the 1st stage；Trunk subscriber and purpose user direct communication are in the 2nd stage.The 1st The data x for being sent to purpose user and the data z-order for being sent to trunk subscriber are sent to trunk subscriber by stage, base station BS. In the 2nd stage, trunk subscriber, which receives, itself wishes the data z obtained and carries out decoding forwarding to the data x for belonging to purpose user, passes through The data for belonging to purpose user recompiled are crossed to useIt indicates.Wherein, x withMeetTable Show mathematic expectaion, | | | | indicate Frobenius norm.Base station and each mobile communications can bring disappearing for bandwidth and energy resource Consumption, in order to reduce the expense of information exchange, does not need to investigate the candidate relay in entire cell.With base station in Fig. 1 The position BS is origin, base station BS and purpose user MSdBetween line be that x-axis establishes rectangular coordinate system, formed quadrant I, II, III and IV.To the mobile station being located in quadrant II and III, due to these mobile stations and purpose user MSdThe distance between Greater than base station BS and purpose user MSdThe distance between, it is contemplated that the communication range of path loss and mobile station, these mobile stations The probability that relaying can be served as is very low.Therefore, the present invention only investigates the mobile station being located in quadrant I and IV.Relaying exists Using ρ to choose in the circular shaded of radius, the mobile station positioned at the region constitutes set omegaR, first prime number in the set Mesh card (ΩR)=KR< K.
Referring to Fig. 2, steps are as follows for realization of the invention：
Step 1, in the transmission time slot t of any one purpose user scheduling, K+1 mobile station MS in cellular network is obtained Geographical location, estimation base station BS can serve as the mobile station MS of relayingk, purpose user MSdChannel matrix h between threes,k、 hs,dWith hk,d。
K+1 mobile station obtains current location information using the GPS module of equipment of itself in (1a) cellular network, and leads to It crosses uplink communication channel and location information is fed back into base station BS；
(1b) base station BS dispatches the mobile station for being located at cell edge for purpose user MSd, wherein radius of society is set as 2Km；
(1c) is to the mobile station MS for serving as relaying being located in cellular networkkWith purpose user MSd, base station BS broadcasting Signal front end addition user side known to training sequence, then the known training sequence received is made decisions instead by each mobile station Feedback realizes base station BS and can serve as the mobile station MS of relayingkBetween channel matrix hs,kWith base station BS and purpose user MSdBetween Channel matrix hs,dEstimation, and by uplink communication channel by hs,kAnd hs,dFeed back to base station BS；
(1d) can serve as the mobile station MS of relayingkThe training sequence known to transmitted signal front end adding purpose user side Column, purpose user MSdFeedback is made decisions according to the known training sequence received, realizes the mobile station MS that can serve as relayingkWith mesh User MSdBetween channel matrix hk,dEstimation, and by uplink communication channel by hk,dFeed back to base station BS.
Step 2, candidate relay user is determined
(2a) base station BS establishes rectangular coordinate system according to the location information obtained from step 1, by Fig. 1, will be with pointFor the center of circle, it is candidate relay region that the circle of radius ρ=350m, which delimited, wherein DdFor purpose user MSdAnd base station BS The distance between；
(2b) constitutes set omega for the mobile station in candidate relay region is located atR, and by the mobile station indicia in the set For candidate relay userWherein
Step 3, the candidate relay user that the channel matrix and step 2 obtained according to step 1 determinesCalculation base station BS With purpose user MSdThe data rate of direct communicationPurpose user MSdVia candidate relay userForward the number obtained According to rateAnd candidate relay userResponse rate
(3a) calculation base station and purpose user MSdThe data rate of direct communication
Wherein PTFor the transmission power of base station BS,For the noise variance of additive white Gaussian noise；
(3b) calculates purpose user MSdVia candidate relay userForward the data rate obtained
Wherein,For base station BS to candidate relay userData rate,For candidate relay user MS to mesh User MSdData rate, be calculated as follows：
Coefficient in two formulasIt is due to candidate relay userWork can not carry out data in semiduplex mode simultaneously Send and receive, and candidate relay user receive data phase and decoding forward the transmission stage used in duration it is equal.When Candidate relay userUse maximum transmission powerWhen purpose user MSdVia candidate relay userForwarding obtains Maximum data rate beValue provide with reference to 3GPP standard；
(3c) calculates candidate relay userResponse rate
Step 4, relaying excitation factor c and rate improvement amount distribution factor are determinedValue.
(4a) is according to beehive network system to purpose user MSdData rate is promoted and candidate relay userReturn The tendentiousness that rate is promoted determines that the value range of relaying excitation factor c, this example c are [0,1], and as c=0, expression makes mesh User MSdRate maximize；As c=1, indicate guaranteeing purpose user MSdCandidate relay is used while transmission performance FamilyReturn maximization；
(4b) is according to purpose user MS in beehive network systemdThe corresponding minimum data rate demand of current business determines speed Rate improvement amount distribution factorThis exampleValue range be [0,1], whenWhen, expression can give candidate relay's Maximal rewards areAnd to purpose user MSdIt only needs to guaranteeIt is not less thanWhenWhen, indicating will All give purpose user MSd。
Step 5, according to the calculated result of step 3 and step 4, it is calculate by the following formula candidate relay userTarget FunctionMaximum value
s.t.s1:
s2:
s3:
s4:
s5:0≤c≤1
s6:
Wherein, candidate relay userTransmission power PRAdjusting range beIt is in the formula only One variable, to each PRValue, there is a target function valueIt is corresponding to it,It indicates from calculating Maximum target functional value is selected in target complete functional value outBase station BS records the maximum valueAnd target letter Number takes the maximum valueWhen candidate relay userThe transmission power P usedR。
Step 6, step 3~step 5 is repeated, in all candidate relay usersMaximum target functional valueIt calculates After the completion, base station BS selectes trunk subscriber MS by following formulal, and trunk subscriber MS is served as by downlink communication channel noticelShifting The transmission power P of dynamic platformR *：
Wherein, l indicates to serve as trunk subscriber MS by selectionlMobile station label, ΩRFor positioned at candidate relay region The set that mobile station is constituted.
Step 7, base station BS is in selected trunk subscriber MSlThe transmission of data is carried out afterwards.
(7a) base station BS jumps transmission time for firstIt is divided into t1And t2Two periods：
(7b) base station BS is in the first period t1To trunk subscriber MSlSend purpose user MSdExpected data, at second Section t2Send trunk subscriber MSlItself wishes the data obtained；Trunk subscriber MSlPurpose user MS is sent to base stationdData Decoding forwarding is carried out, the data for being sent to oneself are received.
Step 8, in the transmission time slot (t+1) of next purpose user scheduling, step 1~step 7 is repeated.
Step 9, in the transmission time slot (t+i) that the user of subsequent i-th of mesh dispatches, step 1~step 7 is repeated, 2 ≤ i≤n, n are total timeslot number of cellular network operation.
Application effect of the invention is described further by emulation experiment below：
One, simulated conditions：Radius of society is 2Km, and base station BS and mobile station MS maximum transmission power are respectively PT=20W andNoise powerFor -104dBm.Path loss L of the base station BS to mobile station MSBS-MS(D) with mobile station MS to shifting The path loss L of dynamic platform MSMS-MS(D), it is calculated as follows respectively：
LBS-MS(D)=128.1+37.6lg (D/1000) (dB)
LMS-MS(D)=16.5+37.6lg (D) (dB)
Wherein, distance of the D between communication entity, unit m.
Two, emulation contents：
Emulation 1, with the method for the present invention in purpose user MSdWith base station distance DdIt is determined when respectively 1.90Km and 2.00Km Candidate relay region.
Using base station BS position as origin, base station BS and purpose user MSdBetween line be x-axis establish rectangular co-ordinate System.Mobile station MS is placed on a certain position in the Ith quadrant of coordinate system and carries out 6000 repetition experiments, mobile station MS uses Transmission power be 2W.In certain primary experiment, as purpose user MSdThe number obtained via the mobile station forwarding in the position It is greater than purpose user MS according to ratedWith the data rate of base station BS direct communication, this Success in Experiment.Success in Experiment number and reality Testing total degree 6000 times ratio indicates that the mobile station in the position can serve as the probability of relaying, obtains candidate relay region such as Shown in Fig. 3, wherein Fig. 3 (a) is purpose user MSdWith base station distance DdFor the candidate relay regional scope determined when 1.90Km, figure 3 (b) be purpose user MSdWith base station distance DdFor the candidate relay regional scope determined when 2.00Km.
The deeper region of color shows that the mobile station in the position can serve as the probability of relaying in Fig. 3 (a) and Fig. 3 (b) It is higher, thus may be selected withFor the center of circle, radius is the circle of 350m as candidate relay region.
To reduce because finding trunk subscriber MSlThe energy consumption and bandwidth cost of generation do not cover model to entire base station BS Mobile station MS in enclosing carries out relaying recruitment, and is only candidate relay user by the mobile station indicia for being located at candidate relay regionIt is investigated, therefrom selectes trunk subscriber MSl。
Emulation 2, with number of mobile stations K of the method for the present invention in relay candidate regionR=20, excitation factor c and rate Improvement amount distribution factorWhen variation, trunk subscriber MS is emulatedlWith purpose user MSdThe variation feelings of the message transmission rate of acquisition Condition, as a result such as Fig. 4.
As seen from Figure 4：
As c < 0.5, beehive network system tends to improve purpose user MSdTransmission rateThereforeIt is larger And relay response rateIt is relatively small, with the increase of relaying excitation factor c, trunk subscriber MSlThe return of acquisitionIncrease Greatly, purpose user MSdTransmission rateIt is corresponding to reduce；And distribution factorVariation pairWithValue without shadow It rings.
WhenWhen, the relaying left side excitation factor c is approached when approaching to 0.5 to the right side to 0.5, and data rate will appear jump Become, due to distribution factorIncreasing indicates purpose user MSdFrom maximum rate improvement amountThe ratio of middle acquisition increases, Lead to maximum rate improvement amountIn be used for trunk subscriber MSlReturn ratio reduce, therefore hopping amplitude with's Increase and reduces.
As c > 0.5, system tendency gives trunk subscriber MSlMore return, trunk subscriber MSlResponse rateIncrease Greatly, purpose user MSdTransmission rateIt reduces, butNot less than base station BS and purpose user MSdWhat direct communication obtained Data rate
The present invention is compared by emulation 3 with the system spectral efficiency of existing non-relay excitation collaboration communication method.
3.1) the system spectral efficiency R using existing non-relay excitation collaboration communication method is calculatedCNRI, it is purpose user MSd Maximum achievable rate:
WhereinIndicate candidate relay userData rate when being communicated with base station BS,For purpose user MSdWith Candidate relay userData rate when communication.
3.2) system spectral efficiency R of the invention is calculatedLIABLE, it is trunk subscriber MSlResponse rateWith purpose user MSdMessage transmission rateThe sum of:
Wherein,For via trunk subscriber MSlThe first of the two-hop link of formation jumps data rate,For via relaying The second of the two-hop link of formation jumps data rate.
3.3) system spectral efficiency that the relaying excitation factor c of different values, comparison are obtained using above two method RCNRIAnd RLIABLESituation of change, simulation result is as shown in Figure 5.
As seen from Figure 5, system uses the system spectral efficiency R obtained when the present inventionLIABLEBetter than using existing non-relay sharp Encourage the system spectral efficiency R of collaboration communication method acquisitionCNRI, this is because base station BS and purpose user MSdData transmission passing through By trunk subscriber MSlIt will form two-hop link when being forwarded, can be generated when the first hop link channel quality is jumped better than second Bottleneck effect.Non-relay excitation collaboration communication method will appear the case where the first hop link resource is wasted at this time, and of the invention By giving the message transmission rate difference of two-hop link to trunk subscriber MSlFor data transmission and make full use of One hop link resource, therefore better system spectral efficiency can be obtained when the use present invention.Also, candidate relay region mobile station Number KRIncrease can bring selection diversity gain, spectrum efficiency in two ways with KRIncrease and increase.
Emulation 4, with relaying energy of the method for the present invention when repeat transmitted power adjustable is whole and repeat transmitted power is fixed The comparison of efficiency.
4.1) relaying energy efficiency η, trunk subscriber MS are calculatedlThe ratio of the response rate of acquisition and the energy of user consumption Value, unit bit/Hz/Joule.It is calculated as follows：
Wherein, PR *For trunk subscriber MSlThe transmission power used,For trunk subscriber MSlResponse rate.
4.2) to the relaying excitation factor c of different values, it is whole solid with repeat transmitted power to compare repeat transmitted power adjustable The situation of change of relaying energy efficiency η in the case of two kinds fixed, simulation result are as shown in Figure 6
As seen from Figure 6, compared to trunk subscriber MSlUse maximum transmission powerAdjust repeat transmitted power It can effectively improve trunk subscriber MSlEnergy efficiency.When relaying excitation factor c > 0.5, since system more focuses on trunk subscriber Return, relay response rateIncrease and trunk subscriber MSlThe transmission power P usedR *It reduces, therefore relays energy efficiency η Occur more obviously increasing when compared to c < 0.5.Also, with rate improvement amount distribution factorReduce, relays energy efficiency η Improvement it is more significant.
The above simulation result shows that candidate relay region is surely reduced upon the look really after user MSlShi Suoxu is investigated Mobile station keep count of and reduce the expense of information exchange；By adjusting relaying excitation factor c and rate improvement amount distribution factorIt can be to purpose user MSdWith trunk subscriber MSlThe data rate of acquisition is adjusted；Also, it compares existing non-relay sharp Collaboration communication method is encouraged, the present invention can obtain more preferably system spectral efficiency；Meanwhile the feelings fixed compared to repeat transmitted power Condition, the present invention can obtain preferably relaying energy efficiency by adjusting repeat transmitted power.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.

Claims (4)

1. being based on the unbalanced relaying motivational techniques of link in a kind of coordination downlink link, realize that steps are as follows：
(1) in the transmission time slot t of any one purpose user scheduling, base station BS in cellular network is to purpose user MSdIt sends Signal with training sequence, purpose user MSdSignal estimates its channel matrix h based on the receiveds,d, and press formulaCalculate itself and the data achievable rate when direct communication of base stationAnd by the achievable rateFeed back to base station BS；
(2) using the mobile station in cellular network in addition to purpose user as candidate relay user, then as follows from candidate Trunk subscriberOne trunk subscriber MS of middle selectionl：
(2a) calculation base station BS is to candidate relay userReachable data rateWith candidate relay userTo purpose User MSdReachable data rate
Wherein,Subscript x indicate to be sent to the data of purpose user, z indicates the data for being sent to trunk subscriber, PTIt indicates Base station transmitting power,For the noise variance of additive white Gaussian noise；For candidate relay userIt is interacted with base station BS The channel matrix of the candidate relay user and base station that obtain in the process；PRFor the transmission power that candidate relay user uses,For Candidate relay userWith purpose user MSdThe channel square of the candidate relay user and purpose user that are obtained in interactive process Battle array；
(2b) calculates purpose user MS according to the calculated result of step (2a)dThe data speed obtained is forwarded via candidate relay user RateWith candidate relay userResponse rateResponse rateIt is to participate in cooperation resource to candidate relay user to disappear The compensation of consumption is the difference of two-hop link rate：
(2c) adjusts candidate relay according to the calculated result of step (2b)Transmission power PRValue, be calculate by the following formula Candidate relay userObjective functionMaximum value, base station BS records the maximum value and target Candidate relay user when function takes the maximum valueThe transmission power P usedRValue：
s.t.s1:
s2:
s3:
s4:
s5:0≤c≤1
s6:
Wherein,For rate improvement amount distribution factor,WhenWhen, expression can give candidate relayMaximum Return isAnd to purpose user MSdIt only needs to guaranteeIt is not less thanWhenWhen, indicating willEntirely Give purpose user MS in portiond；
C is relaying excitation factor, and c ∈ [0,1], as c=0, expression makes purpose user MSdRate maximize；As c=1, It indicates guaranteeing purpose user MSdMake candidate relay while transmission performanceReturn maximization, the value of the two factors is equal It requires to determine according to beehive network system by base station BS；
For candidate relay user's maximum transmission power；
Maximum transmission power is used for candidate relay userWhen purpose user MSdIt is obtained via candidate relay user forwarding The maximum data rate obtained；
(2d) repeats step (2a)~step (2c), in all candidate relay usersTarget function value calculate after the completion of, base The BS that stands selects to make the maximum candidate relay user of target function value as trunk subscriber MSl, and from base station BS to trunk subscriber MSl Send the transmission power P that information notifies it that should useR *；
(3) optimal trunk subscriber MS is being selectedlAfterwards, the first jump transmission time T is divided into two periods by base station BS, at first In section, base station BS is to trunk subscriber MSlSend purpose user MSdExpected data, trunk subscriber MSlIt is carried out after receiving the data Decoding forwarding；Within the second period, base station BS is to trunk subscriber MSlIt sends trunk subscriber itself and wishes the data obtained, relaying User MSlThe data are received；
(4) in the transmission time slot (t+1) of next purpose user scheduling, step (2a)~step (2c) is repeated；
(5) in the transmission time slot (t+i) that the user of subsequent i-th of mesh dispatches, step (2a)~step (2c) is repeated, 2 ≤ i≤n, n are total timeslot number of cellular network existence.
2. being based on the unbalanced relaying motivational techniques of link in coordination downlink link according to claim 1, feature exists In the purpose user MS in step (1)dSignal estimates its channel matrix h based on the receiveds,d, it is first from base station BS to purpose User MSdTraining sequence known to the signal front end adding purpose user side of transmission, then by purpose user MSdKnown to receiving Training sequence makes decisions feedback, realizes the estimation of channel matrix.
3. being based on the unbalanced relaying motivational techniques of link in coordination downlink link according to claim 1, feature exists In purpose user MS in step (2a)dThe maximum data rate obtained is forwarded via candidate relay userAs follows It calculates：
4. being based on the unbalanced relaying motivational techniques of link in coordination downlink link according to claim 1, feature exists In the data rate that base station BS is obtained according to purpose user via candidate relay forwarding in step (3)With returning for candidate relay Report rate rl (z), the first jump transmission time T is divided into two periods, is divided as follows:
Wherein, t1It indicates the duration of the first period, is used for purpose user MSdData transmission；t2Indicate the duration of the second period, For trunk subscriber MSlData transmission.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011020229A1 (en) * 2009-08-17 2011-02-24 上海贝尔股份有限公司 Method for processing data on relay link and related device
CN103607750A (en) * 2013-11-25 2014-02-26 南京邮电大学 Relay selection method based on terminal straight-through communication in next-generation cellular system
CN103716853A (en) * 2013-10-22 2014-04-09 南京邮电大学 Self-adaption multiple-relay selection method in terminal through communication system
CN104244437A (en) * 2014-10-13 2014-12-24 西安电子科技大学 Dynamic relaying incentive fair-share dispatching method for cooperative downlink transmission

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011020229A1 (en) * 2009-08-17 2011-02-24 上海贝尔股份有限公司 Method for processing data on relay link and related device
CN103716853A (en) * 2013-10-22 2014-04-09 南京邮电大学 Self-adaption multiple-relay selection method in terminal through communication system
CN103607750A (en) * 2013-11-25 2014-02-26 南京邮电大学 Relay selection method based on terminal straight-through communication in next-generation cellular system
CN104244437A (en) * 2014-10-13 2014-12-24 西安电子科技大学 Dynamic relaying incentive fair-share dispatching method for cooperative downlink transmission

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
协同无线网络中基于能量价格的信道与功率分配联合优化;张国翊；徐键；罗会洪；谢尧；陈宝仁；;《北京邮电大学学报》;20121031(第5期);全文 *

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