CN105979596A - D2D neighbor user discovery method based on mitigation of in-band emission influence in LTE-A network - Google Patents

Abstract

The invention discloses a D2D neighbor user discovery method based on mitigation of in-band emission influence in an LTE-A network. Open loop power control is carried out on part of users by grouping discovery resource pools from the angle of a reference signal received power RSRP. On the basis that D2D discovery performance loss is relatively low, an SINR of a physical uplink control channel PUCCH is improved. The influences brought by the in-band emission interference IBEI can be reduced. Performance demands can be ensured.

Description

LTE-A network finds method based on the D2D proximal subscribers alleviating band inscattering interference

Technical field

The present invention relates to communication technical field, be specifically related in LTE-A network the D2D based on alleviating band inscattering interference adjacent Closely the user discover that method.

Background content

One of key technology that D2D communicates as 5G, realizes communicating between user by base station forwarding with conventional cellular network Difference, D2D communication is a kind of short-range communication technique using the link that direct transfers between source user and purpose user.By at LTE- A network introduces D2D technology, can reduce the load of base station, and realize higher spectrum efficiency, bigger coverage and Lower energy expenditure.D2D communication has been brought into by 3GPP tissue in the standardized process of LTE-A, and at 3GPP Release It is ProSe D2D defined in 12.

D2D proximal subscribers finds to refer to that user informs the existence of oneself and finds the proximal subscribers of surrounding, is that to realize D2D logical The premise of letter.Compared with finding with the node in Ad-hoc network, sensor network, node is the discovery that and prepares for route formation, Its resource used also is in unauthorized frequency range, and D2D proximal subscribers finding, introducing LTE-A network can be to existing honeycomb The network operation brings certain impact.

Compatibility in view of D2D communication with original cellular network, it is desirable to as small as possible existing LTE frame structure is carried out Change, fully use resource, use D2D proximal subscribers to find resource and Physical Uplink Control Channel (Physical Uplink Control Channel, PUCCH) resource structures of frequency division multiplexing.And the band inscattering interference that this resource structures is brought will Cause the decline of PUCCH signal receiving quality, the mixing automatic request retransmission processes phase of the performance of PUCCH signal and downlink Close, cause throughput of system to decline.Accordingly, it would be desirable to band inscattering interference is effectively treated.

Find cellular network can introduce band inscattering interference (In-band Emission for D2D proximal subscribers Interference, IBEI) problem^[1][2], the solution of existing research includes arranging protection Bandwidth Method, finding resource pool The method of dividision into groups and open Loop Power control method.Document^[3][4]Propose to find D2D the discovery resource pool that resource is divided into two groups in time domain The method of dividision into groups, to D2D, the method finds that performance impact is less, but the transmission quality of only guarantee section PUCCH gets a promotion, and another Before the SINR of part PUCCH signal processes less than interference.Document^[5]In open Loop Power control method consider from two angles, when D2D UE finds when the IBEI that signal brings is excessive, increases PUCCH signal transmission power, or finds letter by reducing D2D UE Number power of launching reduce the impact of band inscattering, though the SINR of PUCCH signal can be effectively improved, but owing to D2D finds letter Number power reduction, finds penalty.

List of references

[1] .3GPP TS 36.101 V12.4.0:Evolved Universal Terrestrial Radio Access (E-UTRA)；User Equipment (UE) radio transmission and reception. [S], 3GPP, 2013.

[2] .3GPP R1-134036 Final Report of 3GPP TSG RAN WG1 #74v1.0.0, [C], (Barcelona, Spain, 19th-23rd August 2013).

[3].Dong Li；Yong Liu, In-Band Emission in LTE-A D2D:Impact and Addressing Schemes[C].2015 IEEE 81stVehicular Technology Conference(VTC Spring), vol., no., pp.1-5,11-14May 2015.

[4].Donghan Kim；YongjunKwak；Jinyoung Oh；et al.Discovery resource grouping for D2D discovery for mitigation of in-band emission in LTE-Advanced [C] .Globecom Workshops (GC Wkshps), Dec.2014, vol., no., pp.869-874.

[5].YongjunKwak；Sangmin Ro；SangBum Kim；et al.Performance Evaluation of D2D Discovery with eNB Based Power Control in LTE-Advanced]C].2014IEEE 80th Vehicular Technology Conference (VTC Fall), Sept.2014, vol., no., pp.1-5.

Summary of the invention

For the deficiencies in the prior art, it is contemplated that proposition one considers alleviates band inscattering to cellular network shadow Ring and find based on the D2D proximal subscribers alleviating band inscattering interference in the LTE-A network of guarantee D2D proximal subscribers discovery performance Method, improves the SINR of PUCCH on the basis of D2D discovery performance loss is less, reduces the impact that IBEI brings, ensure each Performance requirement.

To achieve these goals, the present invention adopts the following technical scheme that

LTE-A network finds method based on the D2D proximal subscribers alleviating band inscattering interference, comprises the steps:

S1 arranges discovery resource pool at BS end and is divided into group 1 and group 2 in a time division manner, before beginning proximal subscribers finds, each D2D UE sends certification request to network and obtains the relevant information (such as identity etc.) of community, and base station is recognized by sending to D2D UE Card information responds, and D2D UE completes synchronization with base station in the process；

After S2 starts discovery procedure, each D2D UE randomly chooses a discovery resource in an initial condition, uses P_maxBroadcast For finding the detectable signal of proximal subscribers about, receive this detectable signal at BS end and calculate the spy of received D2D UE Survey the Reference Signal Received Power RSRP of signal；According to RSRP and P_thMagnitude relationship, D2D UE is grouped, group 1 D2DUE meets RSRP ＞ P_th, the D2D UE of group 2 meets RSRP≤P_th, P_thReception power judgement threshold P for base station_th, P_th Arrange according to the distance for distinguishing D2D UE and BS distance, D2D UE is broadly divided into away from near base station, to base station Annoyance level different；

S3 base station to D2D UE according in step S2, method is grouped after, this grouping information is conveyed to all of D2D UE；Group 2 is not carried out power control, group 1 is carried out open Loop Power control, each D2D in 1 must be organized by open Loop Power control The transmitting power P of UE_D2D:

P_D2D=min{P_max, 10log₁₀(M_D2D)+P_{0_D2D}+αPL}；

P_maxAnd M_D2DRepresent maximum transmit power and the transmission bandwidth of D2D, the P of corresponding D2D UE respectively_{0_D2D}With α be by The parameter that base station controller BSC determines, α is in (0,1), and PL is the path loss between corresponding D2D UE and base station；By closing Reason configuration parameter, can obtain balance between big to BS interference and transmit power value span；

S4 each D2D UE according to the grouping information in step S2 again by subframe number and the subchannel of time/frequency source block Numbering is revised, the D2D UE of group 2 give power, group 1 D2D UE with the power after open Loop Power control after revision Time/frequency source block on send proximal subscribers detectable signal.

It should be noted that in step S4, each D2D UE the most again by the subframe number of time/frequency source block and Subchannel number is revised:

J=n mod NF

(i, j) is the corresponding D2D UE Resource Block for discovery, i Yu j is time-domain and frequency-domain numbering respectively；M and n is right The D2D UE answered is not grouped front time-frequency numbering, NT_group1、NT_group2Being respectively the number of sub frames of group 1 and group 2, NF is number of subchannels.

It should be noted that the RSRP of each D2D UE is according to the following formula:

RSRP=P_Tx-P_L-Shadowing；

P_TxFor the transmitting power of the reference signal of corresponding D2D UE, P_LDamage for the path between corresponding D2D UE and base station Consumption, Shadowing is the shadow fading obeying logarithm normal distribution.

Another technical scheme as the present invention:

Based on the D2D proximal subscribers alleviating band inscattering interference, LTE-A network finds that method comprises the steps:

S1 arranges discovery resource pool at BS end and is divided into group 1 and group 2 in a time division manner, before beginning proximal subscribers finds, each D2D UE sends certification request to network and obtains the relevant information of community, and base station is carried out by sending authentication information to D2D UE Response, D2D UE completes synchronization with base station in the process；

S2 each D2D UE estimates Reference Signal Received Power RSRP when BS end receives its detectable signal in advance, is having When proximal subscribers finds to require, trigger self discovery procedure, this power information is carried in the solicited message sent to base station； After base station receives discovery solicited message, according to this power information, corresponding D2D UE is grouped, when meeting RSRP ＞ P_thTime, This D2D UE is divided into group 1, when meeting RSRP≤P_thTime, this D2D UE is then divided into group 2, P_thReception power for base station differentiates Thresholding；

S3 base station to D2D UE according in step S2, method is grouped after, grouping information is conveyed to correspondence D2D UE；Group 2 is not carried out power control, group 1 is carried out open Loop Power control, each D2D in 1 must be organized by open Loop Power control The transmitting power P of UE_D2D:

P_D2D=min{P_max, 10log₁₀(M_D2D)+P_{0_D2D}+αPL}；

P_maxAnd M_D2DRepresent maximum transmit power and the transmission bandwidth of D2D, the P of corresponding D2D UE respectively_{0_D2D}With α be by The parameter that base station controller BSC determines, α is in (0,1), and PL is the path loss between corresponding D2D UE and base station；

S4 each D2D UE according to the grouping information in step S2 again by subframe number and the subchannel of time/frequency source block Numbering is revised, and the D2D UE of group 2 is being revised with the power after open Loop Power control with the D2D UE of given power, group 1 After time/frequency source block on send proximal subscribers detectable signal.

It should be noted that in step S4, each D2D UE the most again by the subframe number of time/frequency source block and Subchannel number is revised:

J=n mod NF

(i, j) is the corresponding D2D UE Resource Block for discovery, i Yu j is time-domain and frequency-domain numbering respectively；M and n is right The D2D UE answered is not grouped front time-frequency numbering, NT_group1、NT_group2Being respectively the number of sub frames of group 1 and group 2, NF is number of subchannels.

It should be noted that in step S2, each D2D UE estimates the RSRP of self as the following formula:

RSRP=P_Tx-PL-Shadowing；

P_TxFor the transmitting power of the reference signal of corresponding D2D UE, P_LDamage for the path between corresponding D2D UE and base station Consumption, Shadowing is the shadow fading obeying logarithm normal distribution.

The beneficial effects of the present invention is: on the basis of D2D discovery performance loss is less, improves the SINR of PUCCH, subtracts The impact that little IBEI brings, ensures respective performance requirement.

Accompanying drawing explanation

Fig. 1 is that D2D proximal subscribers finds resource structures schematic diagram；

Fig. 2 is that the D2D proximal subscribers using and not using and find the resource pool method of dividision into groups finds cumulative probability of detection comparison diagram；

Fig. 3 is to use the cumulative distribution function figure finding the resource pool method of dividision into groups with open Loop Power control method PUCCH SINR；

Fig. 4 is for using the inventive method PUCCH signal SINR CDF figure；

Fig. 5 is that D2D finds performance comparison schematic diagram.

Detailed description of the invention

Below with reference to accompanying drawing, the invention will be further described, it should be noted that the present embodiment is with this technical side Premised on case, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to this reality Execute example.

In LTE-A network, D2D proximal subscribers discovery can introduce band inscattering interference, according to the work of 3GPP RAN1 meeting Making it is assumed that D2D finds that signal transmission uses the channel architecture similar to PUSCH, Fig. 1 is that D2D based on this hypothesis is neighbouring The user discover that resource structures schematic diagram.According to the difference of objects interfered, IBEI can be divided three classes:

1, D2D sends the IBEI between user；

2, phone user receives, to D2D, the IBEI that user brings；

3, D2D sends user and base station (eNB) is received the IBEI that PUCCH signal causes.

Wherein, the 3rd class band inscattering interference is the research emphasis of the present invention.

Before setting up D2D communication, need to carry out proximal subscribers discovery, for subsequent communications process provide necessary identity information and Channel link information etc. between user, proximal subscribers finds to include asking to trigger and the side of periodic broadcast detectable signal based on user Method.

The present embodiment is mainly as a example by the proximal subscribers of periodic broadcast detectable signal finds, to present invention tool wherein Body application is introduced.LTE-A network finds method based on the D2D proximal subscribers alleviating band inscattering interference, is embodied as Step is as follows:

S1 arranges discovery resource pool at BS end and is divided into group 1 and group 2 in a time division manner, before beginning proximal subscribers finds, each D2D UE sends certification request to network and obtains the relevant information (such as identity etc.) of community, and base station is recognized by sending to D2D UE Card information responds, and D2D UE completes synchronization with base station in the process；

After S2 starts discovery procedure, each D2D UE randomly chooses a discovery resource in an initial condition, uses P_maxBroadcast For finding the detectable signal of proximal subscribers about, receive this detectable signal at BS end and calculate the spy of received D2D UE Survey the Reference Signal Received Power RSRP of signal；According to RSRP and P_thMagnitude relationship, D2D UE is grouped, group 1 D2DUE meets RSRP ＞ P_th, the D2D UE of group 2 meets RSRP≤P_th, P_thFor the reception power judgement threshold of base station, P_thIf Put according to the distance for distinguishing D2D UE and BS distance, D2D UE is broadly divided into away from near base station, to base station Annoyance level is different.

D2D UE in LTE-A network is being connected with BS foundation and after access network, is arranging certain decision threshold at BS P_thAs the follow-up division threshold value that whether D2D UE is carried out open Loop Power control, D2D UE is grouped.By open loop merit Rate control method is effectively combined with resource pool group technology, P_thSize by BS according on PUCCH channel to D2D UE institute The degrees of tolerance of the band inscattering interference produced determines.

It is contemplated that on the impact of cellular network and ensure that D2D proximal subscribers is sent out by using based on alleviating band inscattering Certain customers, to finding that resource pool is grouped, from the angle of Reference Signal Received Power (RSRP), are increased by the method for existing performance Add open Loop Power control.In view of D2D UE at the RSRP of eNB end, it may be found that resource pool is divided into two groups, P_TxFor D2D UE reference The transmitting power of signal, PL is the path loss between D2D UE and eNB, and Shadowing is the shade obeying logarithm normal distribution Decline, RSRP is then represented by:

RSRP=P_Tx-P_L-Shadowing

Packet foundation is the reception power judgement threshold P at eNB_th, the D2D UE of group 1 meets RSRP ＞ P_th, at eNB The SINR that PUCCH receives signal is less, will be done by bigger band inscattering with the PUCCH signal of this group user's frequency division multiplexing Disturb；And organize the D2D UE of 2 and meet RSRP≤P_th, correspondingly, the SINR that PUCCH receives signal is bigger, it is ensured that with this group user The transmission quality of the PUCCH signal of frequency division multiplexing.

S3 base station to D2D UE according in step S2, method is grouped after, this grouping information is conveyed to all of D2D UE；Group 2 is not carried out power control, group 1 is carried out open Loop Power control, each D2D in 1 must be organized by open Loop Power control The transmitting power P of UE_D2D:

P_D2D=min{P_max, 10log₁₀(M_D2D)+P_{0_D2D}+αPL}；

P_maxAnd M_D2DRepresent maximum transmit power and the transmission bandwidth of D2D, the P of corresponding D2D UE respectively_{0_D2D}With α be by The parameter that base station controller BSC determines, α is in (0,1), and PL is the path loss between corresponding D2D UE and base station；By closing Reason configuration parameter, can obtain balance between big to BS interference and transmit power value span.

Owing to the D2D UE of the above-mentioned group 2 being previously mentioned meets RSRP≤P_th, correspondingly, PUCCH receives the SINR of signal relatively Greatly, organize the D2D UE of 1 to cause the transmission quality with the PUCCH signal of this group user's frequency division multiplexing than more serious shadow Ring.After user is carried out packet division, both met the requirement of group 2 user power distribution simplicities, in turn ensure that open loop power The effectiveness of control method, the power of user can be controlled within the specific limits, meet D2D UE simultaneously by the method as far as possible The detectable signal sent will not produce excessive band inscattering interference to PUCCH.

The packet of discovery resource pool is combined with open Loop Power control, P_maxAnd M_D2DRepresent the maximum transmission of D2D UE respectively Power and the transmission bandwidth of D2D, P_{0_D2D}It is to be determined by base station controller (Base Station Controller, BSC) with α Parameter, for the content in terms of RRM.

α is value in [0,1] is interval, when being 0, and P_{0_D2D}Value be { P_max-10log₁₀(M_D2D) or less than this value, deposit It is that BS interference size is fixed in problem；When being 1, transmit power depends entirely on path loss, band inscattering doing at BS Disturbing and can control very well, shortcoming is that the transmit power excursion of D2D UE is big；In (0,1), by reasonable disposition parameter, can To obtain balance between big to BS interference and transmit power value span.

S4 each D2D UE according to the grouping information in step S2 again by subframe number and the subchannel of time/frequency source block Numbering is revised, the D2D UE of group 2 give power, group 1 D2D UE with the power after open Loop Power control after revision Time/frequency source block on send proximal subscribers detectable signal.

Before being provided without scheme provided by the present invention, the proximal subscribers in existing document finds that the distribution of running time-frequency resource is many It is to finding that resource divides according to number of users unification, and the present invention is on this basis, by by aforesaid open loop merit Rate control method is combined with resource pool group technology, and subframe number and subchannel number to time/frequency source block are repaiied as follows Order:

J=n mod NF

(i, j) is the D2D UE Resource Block for discovery, m and n be not for being grouped front time-frequency numbering, i Yu j is time-domain and frequency-domain Numbering, NT_groupl、NT_group2Being respectively the number of sub frames of group 1 and group 2, NF is number of subchannels.

During the present invention can be applied in asking the proximal subscribers triggered to find based on user, visit with based on periodic broadcast The proximal subscribers surveying signal finds that method is roughly the same, differs primarily in that, in step s 2, with periodic broadcast proximal subscribers Detectable signal is different, and D2D UE is according to formula RSRP=P_Tx-PL-Shadowing estimates BS in advance and receives its detectable signal Time Reference Signal Received Power, user have proximal subscribers find require time, trigger self discovery procedure, by this power information Carry in the solicited message sent to base station.After base station receives discovery solicited message, according to this power information, user is carried out Packet.

This invention address that and find the impact on cellular network by reducing D2D proximal subscribers and ensure to find that performance synthesis is examined Consider, on the basis of realizing D2D technology and existing network framework effective integration, ensure the completeness and effectiveness that the user discover that, Provide strong support for follow-up D2D communication.

Performance evaluation

Use the band inscattering interference reduction method finding resource pool packet, D2D is found that resource pool is divided into from time domain Two groups, one group of D2D UE for high RSRP, another group is constant, with this for the transmission of D2D UE, the PUCCH signal of low RSRP Reduce the range of signal of unreliable PUCCH.

The IBEI major part received due to eNB termination comes from the D2D UE that distance eNB is nearer, is therefore carrying out resource After packet, it is also possible to according to the distance between D2D UE and eNB, it is classified as Cell Center User and Cell Edge User two groups, Use different resources respectively.Then by base station scheduling, the transmission use making PUCCH signal is many with Cell Edge User group frequency division The resource of road multiplexing, to alleviate IBEI, this is primarily due to the decline of center of housing estate UE to eNB.

D2D finding, resource pool is divided into two groups, and group 1 meets RSRP ＞ P_th, group 2 meets RSRP≤P_th, PUCCH is used Time-domain resource use random assortment mode.

Observe Fig. 3, it is considered to when D2D proximal subscribers finds the IBEI to cellular network, the reception SINR of PUCCH signal is less than 0dB proportion is 60%.Using D2D to find after the resource pool method of dividision into groups, the PUCCH signal of use group 1 due to D2D UE away from Close to eNB, experienced interference is relatively big, and the user of SINR ＜-10dB has about 1/3rd, and the PUCCH SINR of use group 2 It is all higher than-10dB.

Fig. 2 be under identical parameters according to RSRP to D2D find resource pool packet, PUCCH time-domain resource random assortment time Whether D2D proximal subscribers finds cumulative probability of detection figure, it can be seen that be grouped resource on finding that performance does not the most affect. When PUCCH transmits the time-domain resource of only use group 2 in season, at least half of wasting of resources can be caused, be worthless.

After using open Loop Power control method, launch power and be about 78% at the D2D UE of below 20dBm, observe Fig. 3, when right After D2D finds that signal carries out open Loop Power control, reducing owing to launching power, IBEI reduces, and the SINR of PUCCH signal is carried Rise, with the similar nature ignored in the case of IBEI.But being known by Fig. 5, now, the reduction of power results in a finding that the coverage of signal Reducing, D2D proximal subscribers finds that cumulative probability reduces accordingly.

Contrast D2D finds the resource pool method of dividision into groups and open Loop Power control method, it can be seen that to PUCCH reception signal SINR Speech, can effectively eliminate the impact of IBEI by open Loop Power control, is better than D2D and finds the resource pool method of dividision into groups.But comparison diagram 2 He Fig. 5, D2D find that the resource pool method of dividision into groups is the least to finding that performance reduces, and open Loop Power control method can make discovery performance reduce about 40%.

Analyzing based on above, the present invention considers IBEI and finds performance, propose based on D2D find resource pool packet with The discovery algorithm of open Loop Power control.This algorithm will necessarily inherit both features, thus is controlling what PUCCH was produced by discovery Band inscattering interference aspect and discovery aspect of performance can obtain preferable performance.

D2D UE is grouped, finds that resource pool is divided into group 1 and group 2 in a time division manner, according to RSRP and decision threshold P_th's Magnitude relationship, the UE of group 1 meets RSRP ＞ P_th, group 2 then meets RSRP≤P_th, can be with the PUCCH signal organizing 1 frequency division multiplexing To by bigger IBEI, and organize 2 less, the transmission quality of PUCCH signal be secure.

After D2D UE is according to RSRP division group, resource selection will be carried out according to following formula:

J=n mod NF

(i, j) is the D2D UE Resource Block for discovery, m and n be not for being grouped front time-frequency numbering, i Yu j is time-domain and frequency-domain Numbering, NT_groupl、NT_group2Being respectively the number of sub frames of group 1 and group 2, NF is number of subchannels.

In view of ensureing to find the requirement of performance, after D2D finds resource pool packet, only the D2D UE of group 1 is carried out open loop Power control, computing formula as hereinbefore, for:

P_D2D=min{P_max, 10log₁₀(M_D2D)+P_{0_D2D}+αPL}；

Fig. 4, Fig. 5 respectively carry out D2D resource pool and are grouped and PUCCH signal SINR after certain customers' open Loop Power control Cumulative probability scattergram, D2D find Performance comparision figure.It can be seen that the present invention has considered the IBEI shadow to cellular network Ring, and can reduce the deterioration degree finding performance.

To sum up, based on D2D, proposed finds that resource pool packet has taken into account IBEI with the discovery algorithm of open Loop Power control Impact and the demand of guarantee discovery performance to a certain extent on cellular network, can find preferably to calculate as D2D proximal subscribers Method.

For a person skilled in the art, can according to above technical scheme and design, make various accordingly Change and deformation, and within all these change and deformation should be construed as being included in the protection domain of the claims in the present invention.

Claims (6)

1. In 1.LTE-A network based on alleviate band inscattering interference D2D proximal subscribers find method, it is characterised in that include as Lower step:

   S1 arranges discovery resource pool at BS end and is divided into group 1 and group 2 in a time division manner, before beginning proximal subscribers finds, and each D2D UE sends certification request to network and obtains the relevant information of community, and base station rings by sending authentication information to D2D UE Should, D2D UE completes synchronization with base station in the process；

   After S2 starts discovery procedure, each D2D UE randomly chooses a discovery resource in an initial condition, uses P_maxBroadcast is used for Find the detectable signal of proximal subscribers about, receive this detectable signal at BS end and calculate the detection letter of received D2D UE Number Reference Signal Received Power RSRP；According to RSRP and P_thMagnitude relationship, D2D UE is grouped, group 1 D2D UE Meet RSRP ＞ P_th, the D2D UE of group 2 meets RSRP≤P_th, P_thReception power judgement threshold for base station；

   S3 base station to D2D UE according in step S2, method is grouped after, this grouping information is conveyed to all of D2D UE； Group 2 is not carried out power control, group 1 is carried out open Loop Power control, each D2D UE in 1 must be organized by open Loop Power control Launch power P_D2D:

   P_D2D=min{P_max, 10log₁₀(M_D2D)+P_{0_D2D}+αPL}；

   P_maxAnd M_D2DRepresent maximum transmit power and the transmission bandwidth of D2D, the P of corresponding D2D UE respectively_{0_D2D}It is by base station with α The parameter that controller BSC determines, α is in (0,1), and PL is the path loss between corresponding D2D UE and base station；

   S4 each D2D UE according to the grouping information in step S2 again by subframe number and the subchannel number of time/frequency source block Revising, the D2D UE of group 2 is revised in institute with the power after open Loop Power control with the D2D UE of given power, group 1 Proximal subscribers detectable signal is sent in time/frequency source block.
2. Based on the D2D proximal subscribers discovery side alleviating band inscattering interference in LTE-A network the most according to claim 1 Method, it is characterised in that in step S4, subframe number and the subchannel of time/frequency source block are compiled by each D2D UE the most again Number revise:

   $i=\left\{\begin{array}{cc}m\mathrm{mod}{\mathrm{NT}}_{group1}& RSRP>P_{th}\\ m\mathrm{mod}{\mathrm{NT}}_{group2}+{\mathrm{NT}}_{group1}& RSRP\≤P_{th}\end{array}\right.;$

   J=n mod NF

   (i, j) is the corresponding D2D UE Resource Block for discovery, i Yu j is time-domain and frequency-domain numbering respectively；M and n is corresponding D2D UE is not grouped front time-frequency numbering, NT_group1、N_Tgroup2Being respectively the number of sub frames of group 1 and group 2, NF is number of subchannels.
3. Based on the D2D proximal subscribers discovery side alleviating band inscattering interference in LTE-A network the most according to claim 1 Method, it is characterised in that in step S2, the RSRP of D2D UE is calculated as follows and obtains:

   RSRP=P_Tx-PL-Shadowing；

   P_TxFor the transmitting power of the reference signal of corresponding D2D UE, PL is the path loss between corresponding D2D UE and base station, Shadowing is the shadow fading obeying logarithm normal distribution.
4. In 4.LTE-A network based on alleviate band inscattering interference D2D proximal subscribers find method, it is characterised in that include as Lower step:

   S1 arranges discovery resource pool at BS end and is divided into group 1 and group 2 in a time division manner, before beginning proximal subscribers finds, and each D2D UE sends certification request to network and obtains the relevant information of community, and base station rings by sending authentication information to D2D UE Should, D2D UE completes synchronization with base station in the process；

   S2 each D2D UE estimates Reference Signal Received Power RSRP when BS end receives its detectable signal in advance, neighbouring having The user discover that when requiring, trigger self discovery procedure, this power information is carried in the solicited message sent to base station；Base station After receiving discovery solicited message, according to this power information, corresponding D2D UE is grouped, when meeting RSRP ＞ P_thTime, should D2D UE is divided into group 1, when meeting RSRP≤P_thTime, this D2D UE is then divided into group 2, P_thReception power for base station differentiates door Limit；

   S3 base station to D2D UE according in step S2, method is grouped after, grouping information is conveyed to correspondence D2D UE；Right Group 2 does not carry out power control, and group 1 is carried out open Loop Power control, must organize sending out of each D2D UE in 1 by open Loop Power control Penetrate power P_D2D:

   P_D2D=min{P_max, 10log₁₀(M_D2D)+P_{0_D2D}+αPL}；

   P_maxAnd M_D2DRepresent maximum transmit power and the transmission bandwidth of D2D, the P of corresponding D2D UE respectively_{0_D2D}It is by base station with α The parameter that controller BSC determines, α is in (0,1), and PL is the path loss between corresponding D2D UE and base station；

   S4 each D2D UE according to the grouping information in step S2 again by subframe number and the subchannel number of time/frequency source block Revising, the D2D UE of group 2 is revised in institute with the power after open Loop Power control with the D2D UE of given power, group 1 Proximal subscribers detectable signal is sent in time/frequency source block.
5. Based on the D2D proximal subscribers discovery side alleviating band inscattering interference in LTE-A network the most according to claim 1 Method, it is characterised in that in step S4, subframe number and the subchannel of time/frequency source block are compiled by each D2D UE the most again Number revise:

   $i=\left\{\begin{array}{cc}m\mathrm{mod}{\mathrm{NT}}_{group1}& RSRP>P_{th}\\ m\mathrm{mod}{\mathrm{NT}}_{group2}+{\mathrm{NT}}_{group1}& RSRP\≤P_{th}\end{array}\right.;$

   J=n mod NF

   (i, j) is the corresponding D2D UE Resource Block for discovery, i Yu j is time-domain and frequency-domain numbering respectively；M and n is corresponding D2D UE is not grouped front time-frequency numbering, NT_group1、NT_group2Being respectively the number of sub frames of group 1 and group 2, NF is number of subchannels.
6. Based on the D2D proximal subscribers discovery side alleviating band inscattering interference in LTE-A network the most according to claim 1 Method, it is characterised in that in step S2, each D2D UE estimates the RSRP of self as the following formula:

   RSRP=P_Tx-PL-Shadowing；

   P_TxFor the transmitting power of the reference signal of corresponding D2D UE, PL is the path loss between corresponding D2D UE and base station, Shadowing is the shadow fading obeying logarithm normal distribution.