CN103347246B - Discovery method between proximal subscribers under embedded D2D environment in cellular network - Google Patents

Abstract

The invention discloses the discovery method between proximal subscribers under the most embedded a kind of D2D environment, on the basis of existing cellular network, utilize base station as center control, it is achieved proximal subscribers efficient, glitch-free detects.Control to participate in proximal subscribers detection as center owing to introducing base station, optimize the distribution of detection time/frequency source block, reduce detectable signal and the probability of collision occurs, alleviate network and congested possibility occurs, reduce detection time and detection energy expenditure；Base station gives full play to coordination function, plays an active part in proximal subscribers detection process so that the user that mourns in silence is easier to obtain synchronizing information when carrying out proximal subscribers detection, and ensure that the safety of whole process；Utilizing the base station storage to detection resource allocation information, each user only does simple frequency spectrum detection, finds that occupied running time-frequency resource block message uploads base station.

Description

Discovery method between proximal subscribers under embedded D2D environment in cellular network

Technical field

The invention belongs to communication technical field, relate to the proximal subscribers discovery mechanism of terminal direct connection D2D, can Cellular network for IMT-A standards track evolution.

Background technology

The radio communication that D2D technology is a kind of academia in recent years and industrial quarters is paid close attention to and studied is new Technology.So-called embedded D2D technology, refers in the case of not affecting the integral honeycomb network operation , set up communication link in cellular cell between terminal unit and directly communicate, do not pass through base station The Radio Transmission Technology of transfer.By introducing D2D technology, it is possible to achieve the reusing of cell resource, Improve efficiency of transmission, reduce terminal energy consumption, and then the overall performance of cellular system is greatly improved.

Current academic research direction is concentrated mainly on system modelling, performance evaluation, model selection, merit Rate control, resource distribute, disturb control and counteracting and cooperating relay based on D2D and network Coding etc..And the discussion of these problems is all based on embedded D2D proximal subscribers discovery technique.

What proximal subscribers detected at present is broadly divided into active probing technique and passive detection technology two kinds.F. Article " the On of Baccelli, N. Khude, R. Laroia, et.al. The Design of Device-to-Device Autonomous Discovery " carry Having gone out a kind of active period proximal subscribers Detection Techniques being applicable to Wi-Fi network, the program is fitted Unlicensed frequency range D2D for no center control communicates, it is impossible to maximally utilize in cellular network embedding Enter to introduce under formula D2D environment base station as center control the participating user income brought of detection and User for communicating also cannot complete detection process.

Article " the A Session Setup of Jungha Lee, Jaheon Gu, et.al. Mechanism Based on Selective Scanning for Device-to- Device Communication in Cellular Networks " propose passive event The D2D communication link of triggering property is set up the mode program and is decreased periodically spy compared with active probe Survey the expense of proximal subscribers, but the user discover that during communication is initiated, add use The family waiting time, the discovery that the program is only applicable between the purpose user of source simultaneously cannot obtain source mesh Surrounding's proximal subscribers information of user, it is impossible to the information providing enough makes base station effectively close The model selection of reason distributes with resource.

In embedded D2D system, all in community register user be all probably target acquisition user. How realizing proximal subscribers efficient, glitch-free detection in IMT-A system is to need to grind further The problem study carefully, solved.

Summary of the invention

It is an object of the invention to the deficiency for above-mentioned prior art, propose one the most embedding Enter the detection method between proximal subscribers under formula D2D environment, i.e. on the basis of existing cellular network, Utilize base station as center control, it is achieved proximal subscribers efficient, glitch-free detects.

For achieving the above object, technical scheme comprises the steps:

A kind of discovery method between proximal subscribers under embedded D2D environment in cellular network, including walking as follows Rapid:

(1) when there being new user to add network, user initiates the application that networks to base station, in standard cellular On the basis of communication user access procedure, base station is that new networking user distribution detects for proximal subscribers Time/frequency source block；

(2) user's time/frequency source block according to distribution of mourning in silence of communication is not initiated at the time specified and frequency In rate, determining signal known to firm power transmission, this signal is referred to as detectable signal by us ；

(3) user that mourns in silence passes through frequency spectrum detection at other free timeslots, use of mourning in silence in detection surrounding The detectable signal at family and communication user demodulated reference signal, utilize receive detectable signal and The time of demodulated reference signal, frequency and reception power grade information, form proximal subscribers merit Rate rank list, and upload base station, this power grade list includes receiving time, frequently of signal Rate and arrival receive the power grade information of user；

(4) user communicated, including cellular communication user and D2D communication user, according to Existing communication mechanism proper communication, does not carry out proximal subscribers detection；

(5) after base station receives the proximal subscribers power grade list that user sends, comparison detection time-frequency money Source distribution is closed with the mapping relations of user and the mapping of communication user reference signal frequency and user System, retrieves the proximal subscribers of user, and combine previously known detectable signal transmit power with And communication user transmit power obtains the average channel gain between user and proximal subscribers；

(6) base station utilizes the adjacent communication user profile of the user that mourns in silence, and utilizes the reciprocity of channel to obtain The proximal subscribers of communication user and power grade information；

(7) base station combines mourn in silence user's proximal subscribers power grade information and communication user proximal subscribers Power grade information, it is thus achieved that the mesh topology of the whole network, forms full-network channel gain list, and this is complete Network channel gain list includes that user is to the average channel gain between base station and user.

Described method, wherein the base station described in step (1) is that new networking user distribution is used for neighbouring The time/frequency source block of family detection, is carried out as follows:

(1a) new networking user searches for community master sync signal, it is achieved sign synchronization；And according to main same Step signal search auxiliary synchronous signals, it is achieved frame synchronization；

(1b), after user realizes synchronizing, system is obtained by broadcast channel and Physical Downlink Shared Channel System information, system information include bandwidth, uplink-downlink configuration information, accidental access channel parameter, Power control parameters；

(1c) user sends random access lead code to base station eNB on a random access channel, and eNB solves After going out lead code, calculate the Stochastic accessing-Radio Network Temporary Identifier of correspondence, under eNB passes through Row synchronizing channel sends random access feedback messages to user；

(1d) base station eNB is according to detection Resource Block identification badge service condition, distributes not for user The detection Resource Block identification badge that used and set up detection Resource Block identification badge with Cell Radio Network Temporary Identifier/Identity, Cell-RNTI corresponding relation list；

(1e) the physical detecting time-frequency money that base station eNB is corresponding by now detecting Resource Block identification badge Source information notifies user by sending system information block SIB on Physical Downlink Shared Channel；

(1f) base station eNB and user use identical time domain saltus step rule, calculate this user the most each Used physical detecting running time-frequency resource during detection, updates physical detecting running time-frequency resource and Resource Block body The map listing of part recognition marks.

Described method, wherein the user that mourns in silence of step (3) passes through frequency spectrum detection at other free timeslots , detection surrounding is mourned in silence user's detectable signal, utilizes the time, frequently receiving detectable signal Rate and reception power grade information, form proximal subscribers power grade list, and upload base station , carry out as follows:

(2a) user that mourns in silence is sending the time beyond detectable signal, all in intercepting state；

(2b) user that mourns in silence utilizes matched filtering frequency spectrum detection technology to the signal received, and detects and connects The time of contained detectable signal appearance, frequency information in the collection of letters number；

(2c) receiving after signal passes through matched filtering frequency spectrum detection and obtain statistic of test, mourn in silence user Utilize minimum total error probability criterion that statistic of test is classified, it is thus achieved that the detectable signal of reception Power grade；This detection statistic is the profiling product of the signal received and known detectable signal Carry out related operation acquisition；

(2d) user will receive the time of detectable signal, frequency and receives power grade information, shape Become proximal subscribers power grade list, and upload base station；

(2e) user repeats step (2a)-(2d) regular update list and is uploaded to base station.

Described method, wherein the user that mourns in silence described in step (3) passes through frequency spectrum at other free timeslots Detection, communication user demodulated reference signal in detection surrounding, utilize and receive demodulation with reference to letter Number time, frequency and receive power grade information, formed proximal subscribers power grade list , and upload base station, carry out as follows:

(3a) user that mourns in silence in the demodulated reference signal sending time slots of communication user is not carry out detection letter Number sending, this period, the user that mourns in silence intercepts the demodulation reference of communication user in surrounding Signal；

(3b) user that mourns in silence utilizes matched filtering frequency spectrum detection technology to the signal received, and detects and connects The frequency information that in the collection of letters number, contained reference signal occurs；

(3c) receiving after signal passes through matched filtering frequency spectrum detection and obtain statistic of test, mourn in silence user Utilize minimum total error probability criterion that statistic of test is classified, it is thus achieved that the demodulation reference of reception Signal power level；This detection statistic is the signal received and known demodulated reference signal Profiling product carry out related operation acquisition；

(3d) user by the time of received training sequence, frequency and receives power grade information, shape Become proximal subscribers power grade list, and upload base station；

(3e) user repeats step (3a)-(3d) regular update list and is uploaded to base station.

Described method, wherein the base station described in step (5) combines previously known detectable signal transmission Power and communication user transmit power obtain the average channel gain between user and proximal subscribers, Refer to that base station utilizes known detectable signal transmit power and communication user transmit power, and tie Share the power grade list uploaded at family, by channel gain computing formula, it is thus achieved that user is with adjacent Average channel gain between nearly user.

Described method, wherein the base station described in step (6) utilizes the adjacent communication user of the user that mourns in silence Information, utilizes the reciprocity of channel to obtain proximal subscribers and the power grade information of communication user, Carry out as follows:

(6a) base station retrieves communication user from the power grade list that the user that mourns in silence uploads；

(6b) for a certain communication user, the user that mourns in silence being found this user is reversely searched；This The user that mourns in silence a bit is the proximal subscribers of this communication user, and utilizes the reciprocity of channel, permissible Obtain the average channel gain of the adjacent user that mourns in silence of communication user.

The present invention with under no center control environment (such as ad-hoc) proximal subscribers detection compared with have following Advantage:

(1) control to participate in proximal subscribers detection as center due to introducing base station, optimize detection time-frequency The distribution of Resource Block, reduces detectable signal and the probability of collision occurs, alleviate network and occur gathering around The possibility of plug, reduces detection time and detection energy expenditure；

(2) base station gives full play to coordination function, plays an active part in proximal subscribers detection process so that quiet Silent user is easier to obtain synchronizing information when carrying out proximal subscribers detection, and ensure that whole mistake The safety of journey；

(3) utilizing the base station storage to detection resource allocation information, each user only does the inspection of simple frequency spectrum Survey, find that occupied running time-frequency resource block message uploads base station.Base station is divided by the resource of storage Join the proximal subscribers that information identification is corresponding；

(4) making full use of the computing capability of base station, the mesh topology of the whole network obtains in base station end, for rear Continuous resource distribution, interference control, model selection provides and supports.

Accompanying drawing explanation

Fig. 1 is the detection frame assumption diagram of the embedded D2D of the present invention；

Fig. 2 is the IMT-A cellular network scene schematic diagram that the present invention uses.

Detailed description of the invention

Without loss of generality, apply the present invention to a network readily appreciated is illustrated, Transmission frame-form is as it is shown in figure 1, this transmission frame is not significantly change original cellular communications transmissions frame On the basis of structure, D2D user utilizes cellular communication ascending resource to be transmitted.

The network scenarios that the present invention uses, as shown in Figure 2.In Fig. 2, three users are respectively UE₁、UE₂ And UE₃, they are all in the coverage of base station eNB (evolved Node B), are working as Front moment UE₃And carry out standard cellular communication, and UE between base station₂It is in intercepting of detection cycle Stage, UE₁It is in the launching phase in detection cycle.Make g_ij,i=1,2,3;J=1,2,3 is UE_iWith UE_jBetween channel gain, h_j, j=1,2,3 is UE_jAnd the channel gain between base station eNB, P_j, j=1,2,3 is the transmitting power of each user.PRB is that in LTE system, control centre provides (frequency domain bandwidth is F to the least unit of source distribution₀, the time domain time is T₀), PRBDIS is for being used for The time/frequency source block of detection, PRBCOM is the time/frequency source block for communication.C-RNTI is community Radio Network Temporary Identifier.D2D communication shares cellular communication uplink transmission resource and is operated in frequency division Under duplex FDD mode.

The process that implements of the present invention is:

Step 1: work as UE₁When adding network, UE₁The application that networks is initiated, at standard cellular communication to eNB On the basis of user's access procedure, base station eNB is UE₁Distribution is for the time-frequency money of proximal subscribers detection Source block.

(1a) UE₁Search community master sync signal (PSS), it is achieved sign synchronization；And according to main synchronization Signal search auxiliary synchronous signals (SSS), it is achieved frame synchronization；

(1b) UE₁After realizing synchronizing, by broadcast channel (BCH) and Physical Downlink Shared Channel (PDSCH) (system information includes bandwidth, uplink-downlink configuration information, RAC to obtain system information H parameter, power control parameters etc.).

(1c) UE₁Sending random access lead code to eNB on a random access channel, eNB solves leading After Ma, calculating the Stochastic accessing-Radio Network Temporary Identifier (RA-RNTI) of correspondence, eNB leads to Cross descending synchronous signal channel to UE₁Send random access feedback messages.

(1d) eNB is according to detecting Resource Block identification badge (PDRID) service condition in this cycle , for user UE₁The detection Resource Block identification badge that distribution is not used by, and set up detection money Source block identification badge and Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (C-RNTI) corresponding relation list, As shown in table 1.

Table 1 PDRID Yu C-RNTI corresponding relation list

User identity	C-RNTI	PDRID
			UE1	a	C(2,1)

This step (1d) concrete methods of realizing is as follows:

PDRID is detection Resource Block identification badge, and T is the detection repetition period.One detection repeats There is M radio frames in cycle, each radio frames has some Physical Resource Block P that can be used for detection RB。

In a detection cycle period T, from time domain, it is divided into NT PRB；In system bandwidth, from Be divided into NF PRB on frequency domain, then can be used within a detection cycle proximal subscribers detection time Frequently Resource Block one has K, K=NF*NT.

Detection Resource Block identification badge and this K physical detecting time/frequency source block one_to_one corresponding, C (I , J) and expression some detection concrete Resource Block identification badge, wherein 0≤I≤NF-1,0≤ J≤NT-1.ENB is UE at random₁Distribute untapped detection Resource Block identification badge.

(1e) eNB is by physical detecting running time-frequency resource (PRB corresponding for detection Resource Block identification badge DIS) information informs user UE by the SIB sent on Physical Downlink Shared Channel₁.Concrete real Existing method is as follows:

Detection Resource Block identification badge one has K=NF*NT, and C (I, J) represents some spy concrete Surveying Resource Block identification badge, corresponding physical detecting time/frequency source block PRBDIS also has NF*N T, R (i, j) represents some physical detecting time/frequency source block concrete, wherein 0≤i≤NF-1, 0≤j≤NT-1。

ENB according to the detection Resource Block identification badge and current repetition period sequence number t of user, Calculate the physical detecting time/frequency source block that current time detection Resource Block identification badge is corresponding .Assuming NT=4, specific rules is as follows:

Saltus step rule i (t)=i (t-1); j(t)=[j(t-1)+I] mod NT;

i(t)=i(0); j(t)=[j(0)+t*I] mod NT;

Special: t=0, i (t)=I; j(t)=J;

For user UE₁: t=0, i (0)=2; j(0)=1;

t=1, i(1)=2; j(1)=[j(0)+I] mod NT=[1+2] mod 4 =3;

t=2, i(2)=2; j(2)=[j(1)+I] mod NT =[3+2] mod 4=1;

……

(1f) eNB and user UE₁Use identical time domain saltus step rule, calculate this user UE₁Visit later Used physical detecting running time-frequency resource (PRBDIS) during survey, updates the mapping of PRBDIS Yu PDRID List.

Step 2:UE₁According to the time/frequency source block distributed on the time and frequency of regulation, with constant merit Rate determines signal known to sending, and this signal is referred to as detectable signal by us.

Step 3:UE₂At other free timeslots by frequency spectrum detection, mourn in silence in detection surrounding user Detectable signal and communication user demodulated reference signal (DM RS), utilize receive detectable signal with And the time of demodulated reference signal (DM RS), frequency and reception power grade information, formed Proximal subscribers power grade list, and upload base station, this power grade list includes receiving signal Time, frequency and arrive receive user power grade information；

(3a) user that mourns in silence is sending the time beyond detectable signal, all in intercepting state；

(3b) user that mourns in silence utilizes matched filtering frequency spectrum detection technology to the signal received, and detects and connects The time of contained detectable signal appearance, frequency information in the collection of letters number；

Matched filtering frequency spectrum detection principle is as follows:

The design criteria of matched filtering device detection is exactly that the output signal-to-noise ratio SNR making signal at a time reaches To maximum.Signal to noise ratio snr expression formula is as follows:

$\mathrm{SNR}=\frac{2\mathrm{Es}}{N_0}$

In formula, Es detects the energy of signal, N in being observation time section₀For noise power.

Channel is also superimposed with white Gaussian noise n (t) when transmitting signal, and its average is zero, bilateral power Spectrum density is N_0// 2, therefore receiving signal waveform is:

$r\left(t\right)=s\left(t\right)+n\left(t\right),0\≤t\≤T$

If the optimum linear filter H (ω) under maximum output signal-to-noise ratio criterion, it is output as

$y\left(t\right)=s_o\left(t\right)+n_0\left(t\right)$

At t=t_mTime, output signal-to-noise ratio is:

$\mathrm{\ρ}=\frac{s_o^2\left(t_m\right)}{n_o^2\left(t_m\right)}$

If S (j ω)=F [s (t)], then the output signal after matched filtering device is

$s_o\left(t_m\right)=\frac{1}{2\mathrm{\π}}{\∫}_{-\∞}^{\∞}H\left(\mathrm{j\ω}\right)S\left(\mathrm{j\ω}\right)e^{\mathrm{j\ω}{t}_m}\mathrm{d\ω}$

Power Spectrum of White Noise is | H (j ω) |²N, so noise average power is

$\stackrel{\‾}{n_o^2\left(t\right)}=\frac{1}{2\mathrm{\π}}{\∫}_{-\∞}^{\∞}N{\left|H\left(\mathrm{j\ω}\right)\right|}^2\mathrm{d\ω}$

It doesn't matter with the time to be can be seen that noise average power by formula above, it is possible to draws :

$n_o^2\left(t\right)=\frac{1}{2\mathrm{\π}}{\∫}_{-\∞}^{\∞}N{\left|H\left(\mathrm{j\ω}\right)\right|}^2\mathrm{d\ω}$

Owing to output signal is real number, so signal to noise ratio is

$\mathrm{\ρ}=\frac{s_o^2\left(t_m\right)}{n_o^2\left(t_m\right)}=\frac{{\left|{\∫}_{-\∞}^{\∞}H\left(\mathrm{j\ω}\right)S\left(\mathrm{j\ω}\right)e^{\mathrm{j\ω}{t}_m}\mathrm{d\ω}\right|}^2}{2\mathrm{\πN}{\∫}_{-\∞}^{\∞}{\left|H\left(\mathrm{j\ω}\right)\right|}^2\mathrm{d\ω}}$

According to Cauchy's history gas inequality

${\left|{\∫}_{-\∞}^{\∞}H\left(\mathrm{j\ω}\right)S\left(\mathrm{j\ω}\right)e^{\mathrm{j\ω}{t}_m}\mathrm{d\ω}\right|}^2\≤{\∫}_{-\∞}^{\∞}{\left|H\left(\mathrm{j\ω}\right)\right|}^2\mathrm{d\ω}{\∫}_{-\∞}^{\∞}{\left|S\left(\mathrm{j\ω}\right)\right|}^2\mathrm{d\ω}$

In order to make signal to noise ratio obtain maximum, say, that inequality above will be made to obtain equal sign, When matched filtering device meets: $H\left(\mathrm{j\ω}\right)=k[S\left(\mathrm{j\ω}\right)e^{\mathrm{j\ω}{t}_m}{]}^{*}=\mathrm{kS}(-\mathrm{j\ω})e^{-j{\mathrm{\ωt}}_m}$ ；

The signal to noise ratio maximum of wave filter output is:

${\mathrm{\ρ}}_{\max }=\frac{s_o^2\left(t_m\right)}{n_o^2\left(t_m\right)}=\frac{1}{2\mathrm{\πN}}{\∫}_{-\∞}^{\∞}{\left|S\left(\mathrm{j\ω}\right)\right|}^2\mathrm{d\ω}$

Now, the frequency domain relational expression of matched filtering device is:

$H\left(\mathrm{j\ω}\right)=\mathrm{kS}{(-\mathrm{j\ω})e}^{-j{\mathrm{\ω}}_m}$

Corresponding temporal relationship formula is $h\left(t\right)=F^{-1}\left[H\left(\mathrm{j\ω}\right)\right]={\mathrm{ks}}^{*}(t_m-t)$ ；

Can be shown that the function of matched filtering frequency spectrum detection is equivalent to the letter received by derivation above Number and the profiling product of known detectable signal carry out related operation:

$y\left(t\right)=r\left(t\right)*h\left(t\right)=(s\left(t\right)+n\left(t\right))*s^{*}(t_m-t)$

By the output result i.e. statistic of test of matched filtering device is compared permissible with the threshold value of setting Judge to receive in signal and whether there is detectable signal, and then obtain contained detection letter in reception signal Number occur time, frequency information.

(3c) receiving after signal passes through matched filtering frequency spectrum detection and obtain statistic of test, mourn in silence user Utilize minimum total error probability criterion that statistic of test is classified, it is thus achieved that the detectable signal of reception Power grade.This detection statistic is exactly the output of matched filtering device；

(3d) user will receive the time of detectable signal, frequency and receives power grade information, shape Become proximal subscribers power grade list, and upload base station；

(3e) user repeats step (3a)-(3d) regular update list and is uploaded to base station.

Step 4:UE₃According to existing communication mechanism proper communication, do not carry out proximal subscribers detection.

Step 5: base station receives UE₂After the proximal subscribers power grade list sent, comparison detection time-frequency Resource distributes the mapping of the mapping relations with user and communication user reference signal frequency and user Relation, retrieves the proximal subscribers of user, and combines previously known detectable signal transmit power And communication user transmit power obtains the average channel gain between user and proximal subscribers；

Work as t=1, during NT=4, UE₂The proximal subscribers power grade list being uploaded to base station is as shown in table 2.

Table 2 proximal subscribers power grade list

Receive power	Running time-frequency resource
		P21	R(2,3)
P23	PRB

PRB is UE₃The running time-frequency resource of the proper communication of distribution.The physical detecting that base station is uploaded according to user Running time-frequency resource information and detection running time-frequency resource saltus step rule calculate the PDRID of user, and utilize Table 1 obtains the corresponding relation of PDRID Yu C-RNTI.And according to channel gain formula:

$H_{\mathrm{ij}}=\frac{P_r}{P_t}$

Obtain UE₂With UE₁And UE₂With UE₃Between channel gain H₂₁、H₂₃。

Step 6: base station utilizes the adjacent communication user profile of the user that mourns in silence, and the reciprocity utilizing channel is anti- To the proximal subscribers and the power grade information that obtain communication user；

Step 7: base station combines mourn in silence user's proximal subscribers power grade information and the neighbouring use of communication user Family power grade information, it is thus achieved that the mesh topology of the whole network, forms full-network channel gain list 3, should Full-network channel gain List refers to that each user channel condition information to base station is known in base station, and between user Average channel gain.

Table 3 full-network channel gain list

It should be appreciated that for those of ordinary skills, can be the most in addition Improve or conversion, and all these modifications and variations all should belong to claims of the present invention Protection domain.

Claims (3)

1. a discovery method between proximal subscribers under embedded D2D environment in cellular network, It is characterized in that, comprise the steps:

(1) when there being new user to add network, user initiates the application that networks to base station, at mark On the basis of quasi-cellular communication user's access procedure, base station is that new networking user distribution is used for neighbouring The time/frequency source block of family detection；

(2) do not initiate communication mourn in silence user according to distribution time/frequency source block regulation time Between and frequency on, with firm power send known to determine signal, we by this signal be referred to as visit Survey signal；

(3) user that mourns in silence passes through frequency spectrum detection at other free timeslots, in detection surrounding Mourn in silence the detectable signal of user and communication user demodulated reference signal, utilize the detection letter received Number and the time of demodulated reference signal, frequency and receive power grade information, formed neighbouring User power rank list, and upload base station, this power grade list include receiving signal time Between, frequency and arrive receive user power grade information；

(4) user communicated, including cellular communication user and D2D communication user, According to existing communication mechanism proper communication, do not carry out proximal subscribers detection；

(5) after base station receives the proximal subscribers power grade list that user sends, comparison detection The mapping relations of time-frequency resource allocating and user and communication user reference signal frequency and user Mapping relations, retrieve the proximal subscribers of user, and combine previously known detectable signal and send out Send power and communication user transmit power to obtain the average channel between user and proximal subscribers to increase Benefit；

(6) base station utilizes the adjacent communication user profile of the user that mourns in silence, and utilizes the reciprocal of channel Property obtain the proximal subscribers of communication user and power grade information；

(7) base station combines mourn in silence user's proximal subscribers power grade information and communication user neighbour Nearly user power class information, it is thus achieved that the mesh topology of the whole network, forms full-network channel gain list, This full-network channel gain list includes that user is to the average channel gain between base station and user；

Wherein the base station described in step (1) is that new networking user distribution detects for proximal subscribers Time/frequency source block, carry out as follows:

(1a) new networking user searches for community master sync signal, it is achieved sign synchronization；And according to Master sync signal search auxiliary synchronous signals, it is achieved frame synchronization；

(1b), after user realizes synchronizing, obtained by broadcast channel and Physical Downlink Shared Channel Obtaining system information, system information includes that bandwidth, uplink-downlink configuration information, RACH are joined Number, power control parameters；

(1c) user sends random access lead code to base station eNB on a random access channel, After eNB solves lead code, calculate the Stochastic accessing-Radio Network Temporary Identifier of correspondence, eNB Random access feedback messages is sent to user by descending synchronous signal channel；

(1d) base station eNB according to detection Resource Block identification badge service condition, for Family is distributed the detection Resource Block identification badge being not used by and sets up detection Resource Block identity Recognition marks and Cell Radio Network Temporary Identifier/Identity, Cell-RNTI corresponding relation list；

(1e) base station eNB is visited now detecting physics corresponding to Resource Block identification badge Survey running time-frequency resource information to lead to by sending system information block SIB on Physical Downlink Shared Channel Know user；

(1f) base station eNB and user use identical time domain saltus step rule, calculate this user and exist The most every time detection time used physical detecting running time-frequency resource, update physical detecting running time-frequency resource and The map listing of Resource Block identification badge；

Wherein the base station described in step (5) combine previously known detectable signal transmit power with And communication user transmit power obtains the average channel gain between user and proximal subscribers, refer to base The known detectable signal transmit power of utilization of standing and communication user transmit power, and combine user The power grade list uploaded, by channel gain computing formula, it is thus achieved that user and proximal subscribers Between average channel gain；

Wherein the base station described in step (6) utilizes the adjacent communication user profile of the user that mourns in silence, The reciprocity utilizing channel obtains proximal subscribers and the power grade information of communication user, by as follows Step is carried out:

(6a) base station retrieves communication user from the power grade list that the user that mourns in silence uploads；

(6b) for a certain communication user, the user that mourns in silence being found this user is reversely searched； These users that mourn in silence are the proximal subscribers of this communication user, and utilize the reciprocity of channel, can To obtain the average channel gain of the adjacent user that mourns in silence of communication user.

Method the most according to claim 1, it is characterised in that wherein step (3) The user that mourns in silence at other free timeslots by frequency spectrum detection, mourn in silence in detection surrounding user Detectable signal, utilizes the time of detectable signal that receives, frequency and receives power grade information, Form proximal subscribers power grade list, and upload base station, carry out as follows:

(2a) user that mourns in silence is sending the time beyond detectable signal, all in intercepting state；

(2b) user that mourns in silence utilizes matched filtering frequency spectrum detection technology to the signal received, detection Go out and receive time, the frequency information that in signal, contained detectable signal occurs；

(2c) receive after signal passes through matched filtering frequency spectrum detection and obtain statistic of test, mourn in silence User utilizes minimum total error probability criterion to classify statistic of test, it is thus achieved that the detection of reception Signal power level；This detection statistic is imitative the signal received and known detectable signal Shape product carry out related operation acquisition；

(2d) user will receive the time of detectable signal, frequency and receives power grade information, Form proximal subscribers power grade list, and upload base station；

(2e) user repeats step (2a)-(2d) regular update list and is uploaded to base station.

Method the most according to claim 1, it is characterised in that wherein step (3) The described user that mourns in silence, communicates in detection surrounding by frequency spectrum detection at other free timeslots User's demodulated reference signal, utilizes the time of demodulated reference signal that receives, frequency and receives merit Rate class information, forms proximal subscribers power grade list, and uploads base station, as follows Carry out:

(3a) user that mourns in silence in the demodulated reference signal sending time slots of communication user is not visit Surveying what signal sent, this period, the user that mourns in silence intercepts the demodulation of communication user in surrounding Reference signal；

(3b) user that mourns in silence utilizes matched filtering frequency spectrum detection technology to the signal received, detection Go out and receive the frequency information that in signal, contained reference signal occurs；

(3c) receive after signal passes through matched filtering frequency spectrum detection and obtain statistic of test, mourn in silence User utilizes minimum total error probability criterion to classify statistic of test, it is thus achieved that the demodulation of reception Reference signal power grade；This detection statistic is the signal received and known demodulation reference The profiling product of signal carry out related operation acquisition；

(3d) user by the time of received training sequence, frequency and receives power grade information, Form proximal subscribers power grade list, and upload base station；

(3e) user repeats step (3a)-(3d) regular update list and is uploaded to base station.