CN106455083A - D2D communication resource multiplex selection method, base station and terminal - Google Patents

D2D communication resource multiplex selection method, base station and terminal Download PDF

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Publication number
CN106455083A
CN106455083A CN201510497860.5A CN201510497860A CN106455083A CN 106455083 A CN106455083 A CN 106455083A CN 201510497860 A CN201510497860 A CN 201510497860A CN 106455083 A CN106455083 A CN 106455083A
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China
Prior art keywords
user
base station
transmission power
phone user
frequency spectrum
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张锐
王文焕
杜思琪
刘潇蔓
李勇朝
朱思真
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ZTE Corp
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ZTE Corp
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Priority to CN201510497860.5A priority Critical patent/CN106455083A/en
Priority to PCT/CN2016/092856 priority patent/WO2017024967A1/en
Publication of CN106455083A publication Critical patent/CN106455083A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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

Abstract

The invention provides a D2D communication resource multiplex selection method, a base station and a terminal. The method comprises steps that whether interference caused by completely multiplexing frequency spectrum resources of a cellular user carried out by a D2D user can cause CQI grade drop of the cellular user is sequentially determined by the base station; if not, the frequency spectrum resources of the corresponding cellular user is selected for the D2D user to carry out multiplex; if yes, emission powers of the D2D user and the cellular user can be sequentially calculated according to corresponding signal-to-noise ratio threshold, and the frequency spectrum resources of the corresponding cellular user is selected to carry out multiplex for the D2D user when increment sum of emission powers of the D2D user and the cellular user is the smallest. The method is advantaged in that access probability of the D2D user and power efficiency of the cellular user and D2D communication are substantially improved on the condition that cellular network quality can be guaranteed.

Description

A kind of D2D communication resource is multiplexed method and base station, the terminal of selection
Technical field
The present invention relates to the communications field, a kind of D2D communication resource is multiplexed method and base station, the terminal of selection.
Background technology
Terminal direct connection technical equipment under cellular network is to equipment (Device to Device, abbreviation D2D) Refer to, in the case of not affecting the integral honeycomb network operation, set up communication link between terminal unit and carry out Direction communication, does not pass through the novel radio transmission technology of base station transfer.By introducing D2D technology, can Mitigate base station burden, reduce propagation delay time, improve the availability of frequency spectrum, solve channel radio to a certain extent The deficient problem of letter system spectral resources, lifts cellular network performance further.
Support D2D function cellular network in, user can using co-channel mode multiplexing, orthogonal channel pattern and Three kinds of different patterns of honeycomb mode are communicated, as shown in Figure 1.Co-channel mode multiplexing refer to D2D equipment and Cellular device is communicated using identical running time-frequency resource, co-channel mode multiplexing be divided into multiplexing cellular uplink channel and Multiplexing cellular downlink channel two ways.Orthogonal channel pattern refers to D2D equipment and cellular device using different Running time-frequency resource communicated, now D2D user will not interfere to phone user.Honeycomb mode refers to Pass through BS (Base Station, base station) or AP (Access Point, access point) between D2D equipment Communicated, communication process is similar with cellular communication process, in FDD (Frequency Division Duplex, FDD) under pattern D2D communication up-downgoing respectively account for honeycomb half frequency band.When D2D pair The distance between very little when, now phone user to the interference of D2D user and D2D user to base station Interference all smaller, the channel appearance that channel capacity that co-channel mode multiplexing obtains obtains than orthogonal channel pattern Amount is big.
Because D2D link is multiplexed cellular link resource, therefore co-channel interference can be produced.If this is not disturbed into Row effective process, introduces D2D communication and does not simply fail to lift system performance, make original cellular communication on the contrary Quality Down.Therefore, reasonably carry out resource multiplex selection, the impact reducing interference is most important.
In the prior art scheme, interference management strategy with the communication quality of preferential guarantee phone user and needs Based on asking, it focuses on ensureing the connectedness of D2D link and cellular link.Existing interference-tolerant class In scheme, for D2D user, can only passively accept cellular wireless environment tolerable interference value, no D2D user emission power and multiplexed resource can be adjusted according to D2D user's request.On the one hand, from root On limit D2D communication link-quality it is impossible to give full play to the advantage of D2D short haul connection；Separately On the one hand, when network user's number is more, when network interferences environment is complicated, cellular communication link tolerable Interference value reduce, then due to the restriction of interference threshold, can by multiplexing cellular network resource carry out The number of users of direction communication reduces, and D2D link establishment probability reduces.For phone user, honeybee Recipient in nest communication can only passively tolerate the interference that D2D user causes to its own, causes honeycomb chain The decline of road communication quality.In existing power back-off scheme, power incrementss are certain, are not directed to use Family actual interference state carries out realtime power compensation, will certainly cause the waste of unnecessary transmission power. Simultaneously although having carried out power back-off, still unavoidably occur in that similar the asking of interference-tolerant class scheme Topic, cannot meet the communication requirement of D2D user.In actual applications, if only simple application is above-mentioned dry Disturb Managed Solution, when the interference of D2D link pair cellular link exceedes certain thresholding, system can be refused D2D link accesses, and causes D2D user to allow the decline of access probability.How to support as much as possible User, with D2D mode access network, is a major challenge that interference management faces.
Content of the invention
The technical problem to be solved in the present invention be provide a kind of D2D communication resource be multiplexed selection method and Base station, terminal, on the premise of ensureing cellular network quality, to considerably improve connecing of D2D user Enter probability and cellular network and the power efficiency of D2D communication.
In order to solve above-mentioned technical problem, the invention provides a kind of device-to-device D2D communication resource is multiple Method with selecting, including：
Base station judges that D2D user causes after the frequency spectrum resource of a phone user to being multiplexed completely successively Whether interference causes the decline of phone user's CQI grade, does not such as decline, then for described D2D user couple The frequency spectrum resource selecting corresponding phone user is multiplexed；As declined, then distinguish successively according to corresponding Signal to Interference plus Noise Ratio thresholding calculates the transmission power of D2D user and phone user, selects D2D user and honeycomb The frequency spectrum resource of the minimum phone user of the transmission power incrementss sum of user is described D2D user couple Multiplexing.
Further, said method also has following feature：Respectively successively according to corresponding Signal to Interference plus Noise Ratio door Limit calculates the transmission power of D2D userTransmission power with phone userIt is by below equation Obtain：
Wherein, HbciIt is i-th phone user channel gain to base station, HbdjIt is j-th D2D user Centering send user to base station channel gain, HcidjIt is that i-th phone user uses to j-th D2D The channel gain of the receive user of family centering, HdjIt is the transmission user of j-th D2D user's centering to connecing Receive the channel gain of user, λciIt is base station end Signal to Interference plus Noise Ratio thresholding, λdjIt is j-th D2D user's centering Receive user end Signal to Interference plus Noise Ratio thresholding, N0It is noise power-value in user bandwidth.
Further, said method also has following feature：Described calculate D2D user and phone user After transmission power, also include：
Judge whether the transmission power of the transmission power of the D2D user and phone user calculating exceedes Big permission transmission power；If from all not less than for described D2D user to selection transmission power incrementss The frequency spectrum resource of minimum phone user is multiplexed.
Further, said method also has following feature：Described for described D2D user to select transmitting After the frequency spectrum resource of the minimum phone user of power incrementss is multiplexed, also include:
To described D2D user send the first adjustment information, described first adjustment information include described in calculate D2D user transmission power；
Send the second adjustment information to corresponding phone user, described second adjustment information includes described calculating The transmission power of the phone user going out.
Further, said method also has following feature：Also include：
Described D2D user is notified to select the frequency spectrum resource of multiplexing.
Further, said method also has following feature：Described base station judges D2D user to complete successively Whether the interference causing after being entirely multiplexed the frequency spectrum resource of a phone user causes phone user's CQI grade Before decline, also include：
Described base station receives communication request and the described D2D that the transmitting terminal of described D2D user's centering sends The channel status of the D2D link that the receiving terminal of user's centering sends.
In order to solve the above problems, present invention also offers a kind of base station, wherein, including：
Judge module, judges that D2D user makes to being multiplexed completely after the frequency spectrum resource of a phone user successively Whether the interference becoming causes the decline of phone user's CQI grade；
Computing module, in the case that described judge module judges to decline, respectively successively according to corresponding letter Dry making an uproar calculates the transmission power of D2D user and phone user than thresholding, calculates the transmission power of phone user Incrementss；
Selecting module, in the case of judging not declining in judge module, is described D2D user to choosing The frequency spectrum resource selecting corresponding phone user is multiplexed；For the situation judging not declining in judge module Under, select the corresponding phone user of the transmission power incrementss sum minimum of D2D user and phone user Frequency spectrum resource be described D2D user to multiplexing.
Further, above-mentioned base station also has following feature：
Described computing module, calculates the transmitting of D2D user respectively successively according to corresponding Signal to Interference plus Noise Ratio thresholding PowerTransmission power with phone userObtained by below equation：
Wherein, HbciIt is i-th phone user channel gain to base station, HbdjIt is j-th D2D user The transmitting terminal of centering is to the channel gain of base station, HcidjIt is i-th phone user to j-th D2D user The channel gain of the receiving terminal of centering, HdjIt is the transmitting terminal of j-th D2D user's centering to receiving terminal Channel gain, λciIt is base station end Signal to Interference plus Noise Ratio thresholding, λdjIt is the receiving terminal of j-th D2D user's centering Signal to Interference plus Noise Ratio thresholding, N0It is noise power-value in user bandwidth.
Further, above-mentioned base station also has following feature：
Described judge module, is additionally operable to judge the transmission power of D2D user that calculates and phone user Whether transmission power exceedes maximum allowable transmission power；
Described selecting module, be described judge module judge from all not less than in the case of, for described D2D user is multiplexed to the frequency spectrum resource selecting the minimum phone user of transmission power incrementss.
Further, above-mentioned base station also has following feature：Described base station also includes：
Sending module, for sending the first adjustment information, described first adjustment information to described D2D user Including described in the transmission power of D2D user that calculates；Send the second adjustment letter to corresponding phone user Breath, described second adjustment information include described in the transmission power of phone user that calculates.
Further, above-mentioned base station also has following feature：Described base station also includes：
Notification module, for notifying described D2D user to select the frequency spectrum resource of multiplexing.
Further, above-mentioned base station also has following feature：Described base station also includes：
Receiver module, the communication request and described that the transmitting terminal for receiving described D2D user's centering sends The channel status of the D2D link that the receiving terminal of D2D user's centering sends.
In order to solve the above problems, present invention also offers a kind of multiplexing of device-to-device D2D communication resource The method selecting, including：
D2D terminal sends communication request to base station；
After described D2D terminal receives the notice of described base station, the described base station selected frequency spectrum money of multiplexing Source.
Further, said method also has following feature:Also include：
After described D2D terminal receives the adjustment information of described base station, sent out according to the adjustment of described adjustment information Penetrate power, described adjustment information includes the transmission power of D2D user calculating.
In order to solve the above problems, present invention also offers a kind of multiplexing of device-to-device D2D communication resource The method selecting, including：
D2D terminal sends the channel status of D2D link to base station；
After described D2D terminal receives the notice of described base station, the described base station selected frequency spectrum money of multiplexing Source.
Further, said method also has following feature：Also include：
After described D2D terminal receives the adjustment information of described base station, sent out according to the adjustment of described adjustment information Penetrate power, described adjustment information includes the transmission power of D2D user calculating.
In order to solve the above problems, present invention also offers a kind of terminal, holding equipment is to equipment D2D skill Art, wherein, including：
First sending module, as the transmitting terminal of D2D user couple, for sending communication request to base station；
Multiplexing module, for receiving after the notice of described base station, the described base station selected frequency spectrum money of multiplexing Source.
Further, above-mentioned terminal also has following feature：Also include：
Adjusting module, after receiving the adjustment information of described base station, adjusts transmitting according to described adjustment information Power, described adjustment information includes the transmission power of D2D user calculating.
Further, above-mentioned terminal also has following feature：Also include：
Second sending module, as the receiving terminal of D2D user couple, sends D2D link to described base station Channel status.
To sum up, the present invention provides a kind of D2D communication resource to be multiplexed method and base station, the terminal of selection, knot Close the impact to spectrum efficiency for the modulation coding mode in practice, selectivity is carried out to user according to CQI grade Power back-off, selects users multiplexing with the minimum criterion of power incrementss.The method is ensureing cellular network On the premise of quality, considerably improve the access probability of D2D user and cellular network and D2D leads to The power efficiency of letter, has practical implementation and is worth.
Brief description
Fig. 1 is the schematic diagram of D2D communication unit under cellular network of the prior art；
Fig. 2 is the schematic diagram of the cellular network model supporting D2D communication in prior art；
Fig. 3 be the embodiment of the present invention the D2D communication resource be multiplexed selection method flow chart；
Fig. 4 is the schematic diagram of the multiplexing cellular uplink resource interference of the embodiment of the present invention；
Fig. 5 is the schematic diagram of the base station of the embodiment of the present invention；
Fig. 6 is the schematic diagram of the terminal of the embodiment of the present invention.
Specific embodiment
To under short distance D2D communication scenes under cellular network, when D2D user is multiplexed with phone user During same asset, system can obtain higher spectrum efficiency.Identical with phone user's multiplexing in D2D user In the scene that resource is communicated, the interference being multiplexed different cell resources generations differs, when D2D uses During the multiplexing phone user's uplink resource of family, disturbed by D2D user in system is base station；D2D During user's multiplexing phone user's down-chain resource, that disturbed by D2D user in system is phone user. If the co-channel interference multiplexing not produced is effectively treated, introduces D2D communication and do not simply fail to lift system Performance, makes the Quality Down of original cellular communication on the contrary.Therefore, reasonably carry out resource multiplex selection, Reduce interference effect most important.
For making the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with accompanying drawing Embodiments of the invention are described in detail.It should be noted that in the case of not conflicting, this Shen Please in embodiment and the feature in embodiment can mutual combination in any.
In the present embodiment, in cell, there is M phone user (Ci, i=1,2 ..., M) and N number of D2D user couple (Dj, j=1,2,3 ... N) single cell scenario, as shown in Figure 2.DjBy transmitting terminal TjWith receiving terminal RjComposition. BS is located at the center of the cell that radius is l.CiAnd TjIt is evenly distributed in cell, and RjUniform point Cloth is with TjOn the circumference being radius for center of circle d.DjMultiplexing cellular communication under the control of phone user Upstream or downstream link circuit resource, two kinds of scene objects interfereds are different.It is multiplexed ascending resource, objects interfered is Base station and D2D receive user；Multiplexing downlink resource, objects interfered is that phone user receives use with D2D Family.
D2D user sends before access request to base station, and base station has distributed the letter of same band for phone user Road, and phone user communicated with base station.Phone user adopts constant arrival SNR (Signal to Noise Ratio, signal to noise ratio) power control mechanism, the QoS requirement one of phone user and D2D user Fixed, that is, receive SINR (Signal to Interference plus Noise Ratio, signal and interference plus noise Than) certain.Meanwhile, base station would know that channel gain information between all networked users and base station.D2D connects Receive user and would know that D2D transmitting user and the channel gain information of itself, and this information is passed through to control Channel feedback is to base station.Moreover, it is assumed that a D2D user is to the frequency spectrum being multiplexed a phone user completely Resource, and the frequency spectrum resource used by phone user is at most re-used once.
When D2D user needs communication and meets the constraint of distance, just send communication request letter to base station Breath, simultaneously D2D receiving terminal pass through control channel and send relevant D2D link and disturbed condition to base station Information.According to these information, base station can determine the resource multiplex strategy to D2D communication, and to D2D transmitting terminal sends the value of multiplex strategy and transmission power.
The method that the D2D communication resource of the present embodiment is multiplexed selection comprises the following steps：
Step 11, base station judge D2D user to the frequency spectrum resource being multiplexed a phone user completely successively Whether the interference causing afterwards causes the decline of phone user's CQI grade, does not such as decline, then goes to step 12； As declined, then go to step 13；
Step 12, for described D2D user to select corresponding phone user frequency spectrum resource be multiplexed；
Step 13 respectively calculates D2D user and phone user according to corresponding Signal to Interference plus Noise Ratio thresholding successively Transmission power, is that described D2D user enters to the frequency spectrum resource selecting the minimum phone user of power incrementss Row multiplexing.
Base station in the present embodiment is by judging whether the interference that introducing D2D causes causes phone user The decline of CQI grade, decides whether to adjust phone user's transmission power；According to D2D demand, it is D2D User to selection multiplexed resource and determines D2D user emission power.The transmission power of all terminals is all simultaneously The maximum transmission power P being allowed less than systemM.
As shown in figure 3, comprising the following steps：
Step 100, the transmission power according to SNR thresholding calculating CUE (phone user)；
Step 101, DUE request access；
Step 102, the transmission power according to CUE and SINR thresholding are calculated DUE, and (D2D uses Family) transmission power；
Step 103, the SINR (now including the interference of DUE) of calculating CUE, judge phone user SINR decline whether cause phone user's CQI grade decline, in this way, then go to step 104；Otherwise Go to step 109；
Step 104, the again transmission power according to respective SINR thresholding calculating CUE and DUE；
Whether the transmission power of CUE and DUE that step 105, judgement calculate exceedes maximum allowable Penetrate power, such as have one to exceed in the transmission power of CUE and DUE, then go to step 106, such as do not surpass Cross, then go to step 107；
Step 106, DUE access failure.
Step 107, the frequency spectrum resource of the CUE choosing CUE and DUE power incrementss sum minimum enter Row multiplexing；
Step 108, DUE are successfully accessed.
Step 109, the frequency spectrum resource of this CUE is selected to be multiplexed.
This example taking be multiplexed cellular communication ascending resource scene is as a example analyzed, as shown in Figure 4.Hbci, Hbdj, Hdj, and HcidjIt is C respectivelyi→ BS, Tj→ BS, Tj→RjAnd Ci→RjChannel increase Benefit.
D2D user sends before access request to base station, and base station has distributed the letter of same band for phone user Road, and phone user communicated with base station.Phone user adopts constant arrival SNR power control mechanism, The QoS requirement of phone user and D2D user is certain, that is, receive SINR certain.Meanwhile, base Station would know that channel gain information between all networked users and base station.D2D receive user would know that D2D Transmitting user and the channel gain information of itself, and this information is fed back to base station by control channel. One D2D user is to the frequency spectrum resource being multiplexed a phone user completely, and the frequency spectrum used by phone user Resource is at most re-used once.When D2D user needs communication and meets the constraint of distance, just to base station Send communication request information, D2D receiving terminal passes through control channel to the relevant D2D chain of base station transmission simultaneously Road and the information of disturbed condition.
Before D2D subscriber access system, CiCommunicate between BS, define base station end signal-noise ratio thresholdηci As follows：
PciIt is phone user CiTransmission power, N0It is noise power-value in user bandwidth.
After accessing D2D user, D2D transmitting terminal can produce interference to base station, and phone user can be to D2D Receiving terminal produces interference, and base station end Signal to Interference plus Noise Ratio and D2D user's receiving terminal Signal to Interference plus Noise Ratio are as follows：
PciIt is phone user CiTransmission power, PdjIt is D2D transmitting user TjTransmission power.
Base station end SINR for compensating caused by D2D interference reduces, and is phone user CiIncrease transmitting work( Rate, increment is Δ Pci, that is,Similarly, the transmission power of D2D user is changed intoNow, base station end Signal to Interference plus Noise Ratio and the following institute of D2D user's receiving terminal Signal to Interference plus Noise Ratio Show：
According to equation (2), after introducing D2D can be tried to achieve, phone user's transmission powerSend out with D2D user Penetrate power
Wherein, phone user's transmission power increment Delta PciCan writeIf emission maximum work( Rate is PM, can guarantee that the D2D and respective SINR of phone user is constant by changing transmission power.
Defined in D2D system, spectrum efficiency φ is as performance standard：
Wherein,S () is TjAnd Ci Modulation symbol, F [CQI ()] is the information bit of every symbol.
Additionally, defining W is system bandwidth, when system bandwidth one timing, spectrum efficiency is by CQI, that is, right The quantization of the SINR of measurement is determined.Therefore, for keeping system spectral efficiency certain, transmission power Change and only need to occur in the case of declining when CQI grade rather than when SINR value declines.In view of work( Rate efficiency, the power distribution strategies based on CQI are better than the strategy based on SINR.
Base station distributes resource for phone user, and D2D subscriber access system defines total system power consumption For P, then have：
Wherein,It is the total power increment of network, including the power of phone user Increment and the transmission power of D2D user.So, after introducing D2D user, the power efficiency of system can To be expressed as
BecauseIt is definite value,Value bigger it is desirable to Δ P less it is ensured that cellular network performance.
It can be seen that, the transmission power of D2D is less, and power efficiency is higher.Bigger, expression interferes Less, can basisTo select users multiplexing.If supposing, each phone user at most can only be used by D2D Family is multiplexed once, and each phone user institute distribution bandwidth is the same simultaneously, then for some same Under individual distribution scene, the fixed phone user of target SINR and D2D user,It is equivalent to more greatly P Less.Regard Δ P and introduce the performance number increasing after D2D, power efficiency as cellular systemAs guarantee honeybee The important indicator of nest performance.BecauseIt is definite value, Δ P is less, correspondingValue is bigger, that is, System-power efficiency is bigger.
Base station end selects users multiplexing according to general power incrementss.Assume in cell, have N that D2D is used Family, M phone user.Each phone user is at most multiplexed by a pair of D2D user.From M CUE The N number of user resources of middle selection allow D2D user to be multiplexed, and under respective target SINR restrictive condition, meet Terminal maximum transmission power limits, and obtains respective transmission power.This problem can be modeled as MIXED INTEGER non-thread Property planning problem (MINLP), its mathematical model is as follows
Decision variable:
Optimization aim:
Constraints:
Base station is solved to this problem using Hungary Algorithm, wherein rij=1 represent i-th CUE with J-th D2D user is to multiplexed resource；Forbid being multiplexed for 0 expression.Obtained simultaneously phone user with The transmission power of D2D user.If the transmission power obtaining exceedes the maximum allowable transmission power of terminal, prohibit Only D2D user is multiplexed this phone user's resource；If meeting maximum transmission power to limit, then pass through descending Transmission power after adjusting is notified D2D user and phone user by control channel, and notifies D2D user Communicate be multiplexed resource.
After D2D user receives notice, it is multiplexed the selected frequency spectrum resource in base station, and adjusts transmitting work( Rate.
Fig. 5 is the schematic diagram of the base station of the embodiment of the present invention, as shown in figure 5, the base station bag of the present embodiment Include：
Judge module, judges that D2D user makes to being multiplexed completely after the frequency spectrum resource of a phone user successively Whether the interference becoming causes the decline of phone user's CQI grade；
Computing module, in the case that described judge module judges to decline, respectively successively according to corresponding letter Dry making an uproar calculates the transmission power of D2D user and phone user than thresholding, calculates the transmission power of phone user Incrementss；
Selecting module, in the case of judging not declining in judge module, is described D2D user to choosing The frequency spectrum resource selecting corresponding phone user is multiplexed, and calculates sending out of phone user in described computing module After penetrating power incrementss, it is described D2D user to the phone user selecting transmission power incrementss minimum Frequency spectrum resource is multiplexed.
In a preferred embodiment, described computing module, respectively successively according to corresponding Signal to Interference plus Noise Ratio thresholding Calculate the transmission power of D2D userTransmission power with phone userIt is to be obtained by below equation Arrive：
Wherein, HbciIt is i-th phone user channel gain to base station, HbdjIt is j-th D2D user The transmitting terminal of centering is to the channel gain of base station, HcidjIt is i-th phone user to j-th D2D user The channel gain of the receiving terminal of centering, HdjIt is the transmitting terminal of j-th D2D user's centering to receiving terminal Channel gain, λciIt is base station end Signal to Interference plus Noise Ratio thresholding, λdjIt is the receiving terminal of j-th D2D user's centering Signal to Interference plus Noise Ratio thresholding, N0It is noise power-value in user bandwidth.
In a preferred embodiment, described judge module, is additionally operable to judge sending out of the D2D user calculating Penetrate power and whether the transmission power of phone user exceedes maximum allowable transmission power；
Described selecting module, be described judge module judge from all not less than in the case of, for described D2D user is multiplexed to the frequency spectrum resource selecting the minimum phone user of transmission power incrementss.
In a preferred embodiment, described base station can also include：
Sending module, for sending the first adjustment information, described first adjustment information to described D2D user Including described in the transmission power of D2D user that calculates；Send the second adjustment letter to corresponding phone user Breath, described second adjustment information include described in the transmission power of phone user that calculates.
In a preferred embodiment, described base station can also include：
Notification module, for notifying described D2D user to select the frequency spectrum resource of multiplexing.
In a preferred embodiment, described base station can also include：
Receiver module, the communication request and described that the transmitting terminal for receiving described D2D user's centering sends The channel status of the D2D link that the receiving terminal of D2D user's centering sends.
Fig. 6 is the schematic diagram of the terminal of the embodiment of the present invention, as shown in fig. 6, the terminal of the present embodiment, Support D2D technology, including：
First sending module, as the transmitting terminal of D2D user couple, for sending communication request to base station；
Multiplexing module, for receiving after the notice of described base station, the described base station selected frequency spectrum money of multiplexing Source.
In a preferred embodiment, described terminal can also include：
Adjusting module, after receiving the adjustment information of described base station, adjusts transmitting according to described adjustment information Power, described adjustment information includes the transmission power of D2D user calculating.
In a preferred embodiment, described terminal can also include：
Second sending module, as the receiving terminal of D2D user couple, sends D2D link to described base station Channel status.
One of ordinary skill in the art will appreciate that all or part of step in said method can pass through program Complete to instruct related hardware, described program can be stored in computer-readable recording medium, such as read-only Memorizer, disk or CD etc..Alternatively, all or part of step of above-described embodiment can also use One or more integrated circuits are realizing.Correspondingly, each module/unit in above-described embodiment can adopt The form of hardware is realized, it would however also be possible to employ the form of software function module is realized.The present invention is not restricted to appoint The combination of the hardware and software of what particular form.
These are only the preferred embodiments of the present invention, certainly, the present invention also can have other various embodiments, In the case of without departing substantially from present invention spirit and its essence, those of ordinary skill in the art work as can be according to this Invention is made various corresponding changes and is deformed, but these corresponding changes and deformation all should belong to the present invention Appended scope of the claims.

Claims (19)

1. a kind of method that device-to-device D2D communication resource is multiplexed selection, including：
Base station judges that D2D user causes after the frequency spectrum resource of a phone user to being multiplexed completely successively Whether interference causes the decline of phone user's CQI grade, does not such as decline, then for described D2D user couple The frequency spectrum resource selecting corresponding phone user is multiplexed；As declined, then distinguish successively according to corresponding Signal to Interference plus Noise Ratio thresholding calculates the transmission power of D2D user and phone user, selects D2D user and honeycomb The frequency spectrum resource of the minimum corresponding phone user of the transmission power incrementss sum of user is described D2D User is to multiplexing.
2. the method for claim 1 it is characterised in that：Believe dry making an uproar according to corresponding successively respectively Calculate the transmission power of D2D user than thresholdingTransmission power with phone userIt is by following Formula obtains：
P c i t = λ c i N 0 H b c i + λ c i λ d j N 0 H b d j ( H b c i + λ d j H c i d j ) H b c i ( H b c i H d j - λ d j λ c i H b d j H c i d j ) P d j t = λ d j N 0 ( H b c i + λ d j H c i d j ) H b c i H d j - λ d j λ c i H b d j H c i d j ,
Wherein, HbciIt is i-th phone user channel gain to base station, HbdjIt is j-th D2D user Centering send user to base station channel gain, HcidjIt is that i-th phone user uses to j-th D2D The channel gain of the receive user of family centering, HdjIt is the transmission user of j-th D2D user's centering to connecing Receive the channel gain of user, λciIt is base station end Signal to Interference plus Noise Ratio thresholding, λdjIt is j-th D2D user's centering Receive user end Signal to Interference plus Noise Ratio thresholding, N0It is noise power-value in user bandwidth.
3. the method for claim 1 it is characterised in that：Described calculating D2D user and honeycomb After the transmission power of user, also include：
Judge whether the transmission power of the transmission power of the D2D user and phone user calculating exceedes Big permission transmission power；If from all not less than for described D2D user to selection transmission power incrementss The frequency spectrum resource of minimum phone user is multiplexed.
4. method as claimed in claim 3 it is characterised in that：Described for described D2D user to choosing Select the minimum phone user of transmission power incrementss frequency spectrum resource be multiplexed after, also include:
To described D2D user send the first adjustment information, described first adjustment information include described in calculate D2D user transmission power；
Send the second adjustment information to corresponding phone user, described second adjustment information includes described calculating The transmission power of the phone user going out.
5. the method for claim 1 it is characterised in that：Also include：
Described D2D user is notified to select the frequency spectrum resource of multiplexing.
6. the method as described in any one of claim 1-5 it is characterised in that：Described base station judges successively D2D user is to being multiplexed whether the interference causing after the frequency spectrum resource of a phone user causes honeycomb completely Before the decline of user's CQI grade, also include：
Described base station receives communication request and the described D2D that the transmitting terminal of described D2D user's centering sends The channel status of the D2D link that the receiving terminal of user's centering sends.
7. a kind of base station is it is characterised in that include：
Judge module, judges that D2D user makes to being multiplexed completely after the frequency spectrum resource of a phone user successively Whether the interference becoming causes the decline of phone user's CQI grade；
Computing module, in the case that described judge module judges to decline, respectively successively according to corresponding letter Dry making an uproar calculates the transmission power of D2D user and phone user than thresholding, calculates the transmission power of phone user Incrementss；
Selecting module, in the case of judging not declining in judge module, is described D2D user to choosing The frequency spectrum resource selecting corresponding phone user is multiplexed；For the situation judging not declining in judge module Under, select the corresponding phone user of the transmission power incrementss sum minimum of D2D user and phone user Frequency spectrum resource be multiplexed.
8. base station as claimed in claim 7 it is characterised in that：
Described computing module, calculates the transmitting of D2D user respectively successively according to corresponding Signal to Interference plus Noise Ratio thresholding PowerTransmission power with phone userObtained by below equation：
P c i t = λ c i N 0 H b c i + λ c i λ d j N 0 H b d j ( H b c i + λ d j H c i d j ) H b c i ( H b c i H d j - λ d j λ c i H b d j H c i d j ) P d j t = λ d j N 0 ( H b c i + λ d j H c i d j ) H b c i H d j - λ d j λ c i H b d j H c i d j ,
Wherein, HbciIt is i-th phone user channel gain to base station, HbdjIt is j-th D2D user The transmitting terminal of centering is to the channel gain of base station, HcidjIt is i-th phone user to j-th D2D user The channel gain of the receiving terminal of centering, HdjIt is the transmitting terminal of j-th D2D user's centering to receiving terminal Channel gain, λciIt is base station end Signal to Interference plus Noise Ratio thresholding, λdjIt is the receiving terminal of j-th D2D user's centering Signal to Interference plus Noise Ratio thresholding, N0It is noise power-value in user bandwidth.
9. base station as claimed in claim 7 it is characterised in that：
Described judge module, is additionally operable to judge the transmission power of D2D user that calculates and phone user Whether transmission power exceedes maximum allowable transmission power；
Described selecting module, be described judge module judge from all not less than in the case of, for described D2D user is multiplexed to the frequency spectrum resource selecting the minimum phone user of transmission power incrementss.
10. base station as claimed in claim 9 it is characterised in that：Described base station also includes：
Sending module, for sending the first adjustment information, described first adjustment information to described D2D user Including described in the transmission power of D2D user that calculates；Send the second adjustment letter to corresponding phone user Breath, described second adjustment information include described in the transmission power of phone user that calculates.
11. base stations as claimed in claim 9 it is characterised in that：Described base station also includes：
Notification module, for notifying described D2D user to select the frequency spectrum resource of multiplexing.
12. base stations as described in any one of claim 7-11 it is characterised in that：Described base station also includes：
Receiver module, the communication request and described that the transmitting terminal for receiving described D2D user's centering sends The channel status of the D2D link that the receiving terminal of D2D user's centering sends.
The method that a kind of 13. device-to-device D2D communication resources are multiplexed selection, including：
D2D terminal sends communication request to base station；
After described D2D terminal receives the notice of described base station, the described base station selected frequency spectrum money of multiplexing Source.
14. methods as claimed in claim 13 it is characterised in that：Also include：
After described D2D terminal receives the adjustment information of described base station, sent out according to the adjustment of described adjustment information Penetrate power, described adjustment information includes the transmission power of D2D user calculating.
The method that a kind of 15. device-to-device D2D communication resources are multiplexed selection, including：
D2D terminal sends the channel status of D2D link to base station；
After described D2D terminal receives the notice of described base station, the described base station selected frequency spectrum money of multiplexing Source.
16. methods as claimed in claim 15 it is characterised in that：Also include：
After described D2D terminal receives the adjustment information of described base station, sent out according to the adjustment of described adjustment information Penetrate power, described adjustment information includes the transmission power of D2D user calculating.
A kind of 17. terminals, holding equipment to equipment D2D technology is it is characterised in that include：
First sending module, as the transmitting terminal of D2D user couple, for sending communication request to base station；
Multiplexing module, for receiving after the notice of described base station, the described base station selected frequency spectrum money of multiplexing Source.
18. terminals as claimed in claim 17 it is characterised in that：Also include：
Adjusting module, after receiving the adjustment information of described base station, adjusts transmitting according to described adjustment information Power, described adjustment information includes the transmission power of D2D user calculating.
19. terminals as described in claim 17 or 18 it is characterised in that：Also include：
Second sending module, as the receiving terminal of D2D user couple, sends D2D link to described base station Channel status.
CN201510497860.5A 2015-08-13 2015-08-13 D2D communication resource multiplex selection method, base station and terminal Pending CN106455083A (en)

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