CN102858012A - Subsequent evolution embedded D2D(device-to-device) implementing method on basis of IMT-A (intelligent multimode terminal-advanced) standards - Google Patents

Subsequent evolution embedded D2D(device-to-device) implementing method on basis of IMT-A (intelligent multimode terminal-advanced) standards Download PDF

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CN102858012A
CN102858012A CN2012103445493A CN201210344549A CN102858012A CN 102858012 A CN102858012 A CN 102858012A CN 2012103445493 A CN2012103445493 A CN 2012103445493A CN 201210344549 A CN201210344549 A CN 201210344549A CN 102858012 A CN102858012 A CN 102858012A
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user
base station
proximal subscribers
tabulation
transmission
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李勇朝
孙鹏
刘毅
李丹萍
任智源
张海林
梁海涛
张锐
韩鹍
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Xidian University
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Abstract

The invention discloses a subsequent evolution embedded D2D(device-to-device) implementing method on the basis of IMT-A (intelligent multimode terminal-advanced) standards, and mainly solves the problems that complicated mode selection and single resource allocation strategy during establishment of a cellular network utilizing the embedded D2D technology. The subsequent evolution embedded D2D implementing method includes that a base station acquires state information of a channel between a user and the base station, and forms an adjacent user list by the aid of a global position system GPS; the user percepts adjacent users to acquire a power level list of the adjacent users and uploads the power level list to the base station; the base station forms a full-network channel gain list and generates a D2D potential cluster of the user; the optimal transmission mode is selected for the base station according to the full-network channel gain list, and user's requirement for quantity of service Qos and information of the D2D potential cluster by a joint optimization resource allocation method when the terminal user sends a service request for the base station; and communication is established between the terminal user and a target user according to the selected optimal transmission mode. Compared with conversional cellular communication, the method can assist in increasing frequency spectrum utilization rate, increasing system capacity and reducing overall power consumption of cells.

Description

Based on the embedded D2D implementation method of the follow-up evolution of IMT-A standard
Technical field
The invention belongs to communication technical field, relate to the transmission mechanism of the straight-through D2D of terminal, can be used for the cellular network of the follow-up evolution of IMT-A standard.
Background technology
The D2D technology is the radio communication new technology that a kind of in recent years academia and industrial quarters are paid close attention to and studied.So-called D2D technology refers to set up communication link between the terminal equipment in the cellular cell and carry out direct communication in the situation that do not affect the integral honeycomb network operation, the data transmission technology by the base station transfer.By introducing the D2D technology, can realize reusing, improve efficiency of transmission, reducing the terminal energy consumption of cell resource, and then significantly improve the overall performance of cellular system.There are some researches show, adopt the honeycomb system capacity of D2D mechanism can promote 3-7 times more than, can effectively alleviate the impact that communication resource restriction brings.
Nokia be industrial quarters in the main pusher in D2D field, start from about 2008 based on the D2D technical research of IMT-A, between 2009 to 2010, have more discussion and academy's successes to occur.Present academic research direction mainly concentrates on system modelling, performance evaluation, model selection, power control, resource and distributes, disturbs control and offset and based on the cooperating relay of D2D and network code etc.Though current some preliminary academy's successes of having issued, the maturity of these conclusions and practicality are still very limited, and achievement in research mostly is obtained under specific model.And for concrete D2D key technology, published achievement in research is still limited, and the viewpoint that proposes, algorithm etc. lack academic debate and mutually confirmation.
The D2D system can be based on FDD, also can be based on TDD, and the two cuts both ways.Klaus Doppler has introduced a kind of based on the D2D workflow in the 3GPP LTE-A Cellular Networks in article " Device-to-Device Communications:Functional Prospects for LTE-Advanced Networks ".Although the method can realize embedded D2D service in the 3GPPLTE-A network that has now, still have defective in power control and model selection.And abroad mostly the research of D2D is that for based on frequency division duplex system, when carrying out the exchanges data of non-symmetrical service, the availability of frequency spectrum is not high.
In contrast, TD-LTE since its can the flexible configuration frequency, adjust the technical advantage such as uplink and downlink timeslot ratio and more and more be subject to people's attention.At present, based on the research that embeds D2D communication in the TD-LTE network and few, YuLi in article " Adaptive TDD UL/DL slot utilization for cellular controlled D2D communications ", introduced a kind of in the TD-LTE network D2D self adaptation share the strategy of upstream or downstream resource, and introduced a kind of D2D on the basis of this strategy and created a mechanism.Yet this scheme is to be based upon under a kind of desirable environment with strict power control, has ignored the impact of D2D user on the phone user, and a lot of limitation are arranged in application, and effect is unsatisfactory in practical operation.
Summary of the invention
The objective of the invention is the deficiency for above-mentioned prior art, propose a kind of follow-up evolution based on the IMT-A standard embedded
The D2D implementation method namely on the basis of existing cellular network, is expanded terminal and its adjacent terminals, realizes both direct communications, improves the availability of frequency spectrum of system.
For achieving the above object, technical scheme of the present invention comprises the steps:
(1) base station is regularly set up to contact with each user and is obtained channel condition information between user and base station, and obtains customer position information by global position system GPS, forms proximal subscribers and tabulates;
(2) in the descending period of transmission frame, the user obtains the ascending resource assignment information and in the up period of transmission frame, the user obtains the tabulation of proximal subscribers power grade and uploads to the base station according to ascending resource assignment information perception proximal subscribers;
(3) tabulate in conjunction with the proximal subscribers power grade that channel condition information and user between proximal subscribers tabulation, user and base station upload in the base station, form the tabulation of the whole network channel gain, this the whole network channel gain tabulation, refer to that the base station end knows each user's positional information, each user to the channel condition information of base station, and the average channel gain between the user;
(4) tabulate according to the whole network channel gain in the base station, according to the criterion that satisfies the required minimum QoS of customer QoS demand of the straight-through D2D transmission of terminal, form potential bunch of the straight-through D2D of terminal, this potential bunch refers to launch user-center, comprises with it setting up user's set that the straight-through D2D of terminal is connected;
(5) terminal use connects by control channel and base station, and sends service request;
(6) base station is according to the tabulation of the whole network channel gain and QoS of customer QoS demand, and straight-through potential bunch of information of D2D of terminal, in conjunction with the combined optimization distribution method of frequency, power and space resources, from nonopiate resource multiplex pattern, orthogonal resource multiplexer mode and standard cellular pattern, select optimum transmission mode;
(7) base station is distributed time, frequency, power and space resources according to the result of model selection for the terminal use;
(8) through after model selection and the resource distribution, the terminal use sets up with the targeted customer and communicates by letter, and according to optimal transmission mode decision communication mode and the system transmissions frame selected, if select nonopiate resource multiplex pattern or orthogonal resource multiplexer mode, then the terminal use carries out the straight-through D2D of terminal with the targeted customer and communicates by letter in transmission period, if the choice criteria honeycomb mode, then the terminal use carries out standard cellular with the targeted customer and communicates by letter in transmission period.
The described base station of above-mentioned steps (1) obtains customer position information by global position system GPS and forms the proximal subscribers tabulation, carries out as follows:
(1a) user obtains the positional information of oneself and uploads the base station by global position system GPS;
(1b) base station put in order positional information calculation that each user uploads go out user and proximal subscribers apart from d, and according to channel fading model, calculate the theoretical channel gain of user and proximal subscribers:
g=d -α
Wherein, d is the distance between the user, and α is the channel fading index;
(1c) base station is corresponding one by one with identify label and the theoretical channel gain of these proximal subscribers, forms the proximal subscribers tabulation;
(1d) user's regular update and upload own positional information makes the base station upgrade the proximal subscribers tabulation.
Above-mentioned steps (2) described descending period at transmission frame, the user obtains the ascending resource assignment information and in up period of transmission frame, the user obtains the tabulation of proximal subscribers power grade and uploads the base station according to ascending resource assignment information perception proximal subscribers, carries out as follows:
(2a) in the descending period of transmission frame, the user intercepts physical downlink control channel PDCCH, obtains ascending resource assignment information and storage;
(2b) in the up period of transmission frame, the user obtains identity information and the received signal power information of proximal subscribers according to ascending resource assignment information perception proximal subscribers;
(2c) user quantizes the signal power that receives, and by the watt level divided rank, forms a proximal subscribers power grade tabulation that comprises proximal subscribers sign, power grade;
(2d) user uploads the proximal subscribers power grade and tabulates to the base station;
(2e) user's repeating step (2a)-(2d) regular update is tabulated and is uploaded to the base station.
The described base station of above-mentioned steps (3) forms the tabulation of the whole network channel gain in conjunction with the proximal subscribers power grade tabulation that channel condition information and user between proximal subscribers tabulation, user and base station upload, and carries out as follows:
(3a) the proximal subscribers power grade tabulation analysis-by-synthesis uploaded in conjunction with channel condition information and user between proximal subscribers tabulation, user and base station of base station, obtain user's identify label, neighbouring relations between user and the proximal subscribers, and the average channel gain between user and the proximal subscribers;
(3b) base station is take User Identity as index, retrieve channel condition information between customer position information and user and base station, and formation user message table, first is User Identity in the user message table, second is channel condition information between user and base station, the 3rd is customer position information, last item guides item for the proximal subscribers table that adds, proximal subscribers table in the user message table is guided a proximal subscribers table that points to the user, the proximal subscribers table comprises the neighbouring relations between user and the proximal subscribers, and the average channel gain between user and the proximal subscribers, user message table and proximal subscribers table consist of the tabulation of the whole network channel gain jointly.
The described transmission mode of selecting optimum of above-mentioned steps (6), carry out as follows:
(6a) base station according to the criterion that minimizes total transmitting power, calculates the total transmitting power minimum value under following three kinds of transmission modes, that is: according to the tabulation of the whole network channel gain and service quality QoS demand
Total transmitting power minimum value P under the nonopiate resource multiplex pattern 1:
P 1=min(∑ N-MP C+∑ MP C+∑ MP D)，
Total transmitting power minimum value P under the orthogonal resource multiplexer mode 2:
P 2=min(∑ NP C+∑ MP D)，
Total transmitting power minimum value P under the standard cellular pattern 3:
P 3=min(∑ NP C+∑ 2MP D)，
Wherein, P CThe transmitting power of expression standard cellular communication, P DThe transmitting power of expression D2D communication, N represents to carry out the number of users of standard cellular communication, and M represents to carry out the right quantity of user of D2D communication, and N 〉=M;
(6b) make P Min=min (P 1, P 2, P 3), P MinCorresponding pattern is selected optimal transmission pattern;
(6c) determine the optimal transmission pattern after, with the transmitting power under this pattern, as the power distribution result of optimum.
The present invention and conventional cellular systems relatively have the following advantages:
(1) availability of frequency spectrum effectively improves.The present invention has improved the availability of frequency spectrum from three approach: the first, when two equipment adopt D2D communication, only need a pair of running time-frequency resource get final product, and as during employing standard cellular communication mode, must use two pairs of running time-frequency resources; The second, be lower than under the condition of thresholding in phase mutual interference between two pairs of D2D links, identical running time-frequency resource can be reused at two pairs of D2D links; The 3rd, identical running time-frequency resource also can be reused at D2D link and legacy cellular link.
(2) connection setup of the present invention is under the prerequisite that disturbed condition allows, and realizes by the power distributing technique means, and standard cellular communication is not destroyed and significantly disturbs; The power that equipment adopts when D2D communicates by letter is far below standard cellular communication, so the present invention can reduce the energy consumption of unit capacity in the cellular cell, and more " green ", also makes battery powered portable terminal have longer endurance;
(3) the present invention communicates by letter and direct transfers originally changing equipment room into by the data flow of base station transfer, therefore unloaded the part burden of base station, and the length of transmission frame remains unchanged, then to the lifting of power system capacity, do not need extra interface-free resources, also different from cell splitting traditionally, can not bring system equipment, such as the multiplication of base station.
Description of drawings
Fig. 1 is the workflow diagram of the embedded D2D of the present invention;
Fig. 2 is the frame assumption diagram of the embedded D2D of the present invention;
Fig. 3 is the IMT-A cellular network scene schematic diagram that the present invention uses.
Embodiment
Be without loss of generality, apply the present invention to be illustrated in the network of being convenient to understand, transmission frame-form as shown in Figure 2, this transmission frame is significantly not change on the basis of original cellular communications transmissions frame structure, D2D user utilizes the cellular communication ascending resource to transmit.
The network scenarios that the present invention uses, as shown in Figure 3.Three users are respectively UE among Fig. 3 1, UE 2And UE 3, they are all in the coverage of base station BS, at current time UE 1, UE 2And UE 3Communicate by letter with carrying out standard cellular between the base station, at next moment UE 2With UE 3Between mutual communication requirement is arranged.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 the base station BS, l j, j=1,2,3 is the UE that obtains by GPS jPositional information, D2D communication shares the cellular communication uplink transmission resource and also is operated under the TDD mode, and the transmitting-receiving time slot ratio of D2D communication is 1:1.
With reference to Fig. 1, specific implementation process of the present invention is:
Step 1: the base station is regularly set up to contact with each user and is obtained between user and base station channel condition information and obtain customer position information by global position system GPS to form proximal subscribers and tabulate.
(1a) user obtains the positional information of oneself and uploads the base station by global position system GPS;
(1b) base station put in order positional information calculation that each user uploads go out user and proximal subscribers apart from d, and according to channel fading model, calculate the theoretical channel gain of user and proximal subscribers:
g=d -α
Wherein, d is the distance between the user, and α is the channel fading index;
(1c) base station is corresponding one by one with identify label and the theoretical channel gain of these proximal subscribers, forms proximal subscribers tabulation 1;
The tabulation of table 1 proximal subscribers
Figure BDA00002145808500051
First is User Identity in the table 1, and second is customer position information, and the 3rd is the neighboring user identify label, and last item is the theoretical channel gain between user and the neighboring user, i.e. first user UE 1Neighboring user be second user UE 2With third party UE 3, UE wherein 2With UE 1Between theoretical channel gain be g 12, UE 3With UE 1Between theoretical channel gain be g 13
(1d) user's regular update and upload own positional information makes the base station upgrade proximal subscribers tabulation 1.
Step 2: in the descending period of transmission frame, the user obtains the ascending resource assignment information and in the up period of transmission frame, the user obtains the tabulation of proximal subscribers power grade and uploads the base station according to ascending resource assignment information perception proximal subscribers.
(2a) in the descending period of transmission frame, the user intercepts physical downlink control channel PDCCH, obtains ascending resource assignment information and storage;
(2b) in the up period of transmission frame, the user obtains identity information and the received signal power information of proximal subscribers according to ascending resource assignment information perception proximal subscribers;
(2c) user quantizes the signal power that receives, and by the watt level divided rank, forms a proximal subscribers power grade tabulation 2 that comprises proximal subscribers sign, power grade;
(2d) user uploads proximal subscribers power grade tabulation 2 to the base station;
The tabulation of table 2 proximal subscribers power grade
Figure BDA00002145808500061
First is User Identity in the table 2, and second is the neighboring user identify label, and last item is the received power grade between user and the neighboring user, i.e. first user UE 1Neighboring user be second user UE 2With third party UE 3, UE wherein 1Receive UE 2The received power grade be p 12, UE 1Receive UE 3The received power grade be p 13
(2e) user's repeating step (2a)-(2d) regular update is tabulated and is uploaded to the base station.
Step 3: the base station forms the whole network channel gain tabulation 3 in conjunction with the proximal subscribers power grade tabulation that channel condition information and user between proximal subscribers tabulation, user and base station upload.
(3a) the proximal subscribers power grade tabulation analysis-by-synthesis uploaded in conjunction with channel condition information and user between proximal subscribers tabulation, user and base station of base station, obtain user's identify label, neighbouring relations between user and the proximal subscribers, and the average channel gain between user and the proximal subscribers;
(3b) base station is take User Identity as index, retrieve channel condition information between customer position information and user and base station, and formation user message table, first is User Identity in the user message table, second is channel condition information between user and base station, the 3rd is customer position information, last item guides item for the proximal subscribers table that adds, proximal subscribers table in the user message table is guided a proximal subscribers table that points to the user, the proximal subscribers table comprises the neighbouring relations between user and the proximal subscribers, and the average channel gain between user and the proximal subscribers, user message table and proximal subscribers table consist of the whole network channel gain tabulation 3 jointly.
The tabulation of table 3 the whole network channel gain
Figure BDA00002145808500071
The power grade tabulation that base station binding signal transmitting power and user upload calculates the average channel gain g between proximal subscribers.As shown in table 3, formed the whole network channel gain tabulation comprises two sublists, and previous sublist is user message table, has recorded user's identify label, subscriber channel state information, customer position information, and comprises a guide item that points to the proximal subscribers table; A rear sublist is the proximal subscribers table, and the proximal subscribers table comprises the neighbouring relations between user and the proximal subscribers, and the average channel gain between user and the proximal subscribers.
Step 4: the base station is according to the tabulation of the whole network channel gain, and the criterion according to satisfying the required minimum QoS of customer QoS demand of the straight-through D2D transmission of terminal forms potential bunch of the straight-through D2D of terminal, i.e. UE 3Consist of UE 2Potential bunch of D2D, UE 2Consist of UE 3Potential bunch of D2D.
The criterion of wherein said minimum QoS of customer QoS demand refers under the restriction of maximum transmission power, guarantees that the Signal Interference and Noise Ratio SINR of D2D transmission is not less than the thresholding of base station sets.
Potential bunch of the straight-through D2D of wherein said formation terminal, to tabulate according to the whole network channel gain in the base station, judge whether user and proximal subscribers channel condition satisfy and carry out the minimum QoS of customer QoS demand that D2D signal post needs, will satisfy the set of proximal subscribers of this demand as potential bunch of user's D2D.
Step 5: the terminal use connects by control channel and base station, and sends service request, i.e. next first user UE of the moment 1Request and base station communication, second user UE 2Request and third party UE 3Communication.
Step 6: the base station is according to the tabulation of the whole network channel gain and QoS of customer QoS demand, and straight-through potential bunch of information of D2D of terminal, in conjunction with the combined optimization distribution method of frequency, power and space resources, from nonopiate resource multiplex pattern, orthogonal resource multiplexer mode and standard cellular pattern, select optimum transmission mode.
Wherein said QoS of customer QoS demand refers to guarantee the standard cellular communication minimum transmission rate of communicating by letter with D2D.
The straight-through D2D bunch of information of wherein said terminal refers to UE 3Be positioned at UE 2Potential bunch of D2D in, UE 2Be positioned at UE 3Potential bunch of D2D in.
The wherein said transmission mode of optimum of selecting is carried out as follows:
(6a) tabulate and the service quality QoS demand according to the whole network channel gain in the base station, and the straight-through potential bunch of information of D2D of terminal, according to the criterion that minimizes total transmitting power, calculates the total transmitting power minimum value under following three kinds of transmission modes:
(6a1) the total transmitting power minimum value under the nonopiate resource multiplex pattern is calculated:
Under this pattern, D2D communication is communicated by letter with standard cellular and is used identical frequency spectrum resource, first user UE 1Can be to second user UE 2With third party UE 3Cause interference, UE 2And UE 3Can cause interference to the base station, use N 0The expression noise power, R cThe minimum transmission rate of expression standard cellular communication, R dTherefore the minimum transmission rate of expression D2D communication is UE 1Transmitting power P C, UE 2Carry out the transmitting power P of D2D communication D2, and UE 3Carry out the transmitting power P of D2D communication D3Should satisfy:
log 2 ( 1 + P C h 1 max ( h 2 P D 2 , h 3 P D 3 ) + N 0 ) ≥ R c ,
log 2 ( 1 + P D 2 g 23 P C g 13 + N 0 ) ≥ R d ,
log 2 ( 1 + P D 3 g 23 P C g 12 + N 0 ) ≥ R d ,
The total transmitting power minimum value under the nonopiate resource multiplex pattern then P 1 = min ( P C + 1 2 P D 2 + 1 2 P D 3 ) ;
(6a2) the total transmitting power minimum value under the orthogonal resource multiplexer mode is calculated:
Under this pattern, D2D communication is communicated by letter with standard cellular and is used the frequency spectrum resource of quadrature, and supposes that it is α that cellular communication resources accounts for system's total resources ratio 1, it is α that the D2D communication resource accounts for system's total resources ratio 2, and α 1+ α 2=1, use N 0The expression noise power, R cThe minimum transmission rate of expression standard cellular communication, R dTherefore the minimum transmission rate of expression D2D communication is first user UE 1Transmitting power P C, second user UE 2Carry out the transmitting power P of D2D communication D2, and third party UE 3Carry out the transmitting power P of D2D communication D3Should satisfy:
α 1 log 2 ( 1 + P C h 1 N 0 ) ≥ R c
α 2 log 2 ( 1 + P D 2 g 23 N 0 ) ≥ R d
P D3=P D2
The total transmitting power minimum value P under the orthogonal resource multiplexer mode then 2=min (P C+ P D2);
(6a3) the total transmitting power minimum value under the standard cellular pattern is calculated:
Under this pattern, network deteriorates to standard cellular network, and hypothesis UE 1It is α that communication accounts for system's total resources ratio 1, UE 2, UE 3It is α that communication accounts for system's total resources ratio 2And α 1+ α 2=1, use N 0The expression noise power, R cThe minimum transmission rate of expression standard cellular communication, R dTherefore the minimum transmission rate of expression D2D communication is first user UE 1Transmitting power P C, second user UE 2Transmitting power P D2, and third party UE 3Transmitting power P D3Should satisfy:
α 1 log 2 ( 1 + P C h 1 N 0 ) ≥ R c
α 2 2 log 2 ( 1 + P D 2 h 2 N 0 ) ≥ R d
α 2 2 log 2 ( 1 + P D 3 h 3 N 0 ) ≥ R d
The total transmitting power minimum value under the standard cellular pattern then P 3 = min ( P C + 1 2 P D 2 + 1 2 P D 3 ) ;
(6b) make P Min=min{P 1, P 2, P 3, P then MinCorresponding pattern is selected optimal transmission pattern;
(6c) determine the optimal transmission pattern after, with the transmitting power under this pattern, as the power distribution result of optimum.
It should be noted that: the criterion of model selection minimizes total transmitting power including but not limited to step (6a) is described, and during base station selected different criterion, user's service quality QoS demand is different.
Step 7: the base station is UE according to the result of model selection 1, UE 2And UE 3Distribution time, frequency, power and space resources.
Step 8: after distributing through model selection and resource, i.e. first user UE 1The Criterion cellular communication, second user UE 2With third party UE 3According to optimal transmission mode decision communication mode and the system transmissions frame selected, if select nonopiate resource multiplex pattern or orthogonal resource multiplexer mode, then UE 2In transmission period with UE 3Carry out the straight-through D2D communication of terminal, if choice criteria honeycomb mode, then UE 2In transmission period with UE 3Carry out standard cellular communication.
Wherein said transmission frame is comprised of standard cellular transmission period and D2D transmission period, and this two-part length is dynamically adjusted according to network demand, but total transmission frame length remains unchanged, and namely the cellular network transfer resource of eating dishes without rice or wine is constant.
More than be a preferred embodiment of the present invention, do not consist of any limitation of the invention, obviously under thought of the present invention, can do different changes, but these are all at the row of protection of the present invention.

Claims (8)

1. the embedded D2D implementation method of the follow-up evolution based on the IMT-A standard comprises the steps:
(1) base station is regularly set up to contact with each user and is obtained channel condition information between user and base station, and obtains customer position information by global position system GPS, forms proximal subscribers and tabulates;
(2) in the descending period of transmission frame, the user obtains the ascending resource assignment information and in the up period of transmission frame, the user obtains the tabulation of proximal subscribers power grade and uploads to the base station according to ascending resource assignment information perception proximal subscribers;
(3) tabulate in conjunction with the proximal subscribers power grade that channel condition information and user between proximal subscribers tabulation, user and base station upload in the base station, form the tabulation of the whole network channel gain, this the whole network channel gain tabulation, refer to that the base station end knows each user's positional information, each user to the channel condition information of base station, and the average channel gain between the user;
(4) tabulate according to the whole network channel gain in the base station, according to the criterion that satisfies the required minimum QoS of customer QoS demand of the straight-through D2D transmission of terminal, form potential bunch of the straight-through D2D of terminal, this potential bunch refers to launch user-center, comprises with it setting up user's set that the straight-through D2D of terminal is connected;
(5) terminal use connects by control channel and base station, and sends service request;
(6) base station is according to the tabulation of the whole network channel gain and QoS of customer QoS demand, and straight-through potential bunch of information of D2D of terminal, in conjunction with the combined optimization distribution method of frequency, power and space resources, from nonopiate resource multiplex pattern, orthogonal resource multiplexer mode and standard cellular pattern, select optimum transmission mode;
(7) base station is distributed time, frequency, power and space resources according to the result of model selection for the terminal use;
(8) through after model selection and the resource distribution, the terminal use sets up with the targeted customer and communicates by letter, and according to optimal transmission mode decision communication mode and the system transmissions frame selected, if select nonopiate resource multiplex pattern or orthogonal resource multiplexer mode, then the terminal use carries out the straight-through D2D of terminal with the targeted customer and communicates by letter in transmission period, if the choice criteria honeycomb mode, then the terminal use carries out standard cellular with the targeted customer and communicates by letter in transmission period.
2. method according to claim 1, wherein the described base station of step (1) obtains customer position information by global position system GPS and forms the proximal subscribers tabulation, carries out as follows:
(1a) user obtains the positional information of oneself and uploads the base station by global position system GPS;
(1b) base station put in order positional information calculation that each user uploads go out user and proximal subscribers apart from d, and according to channel fading model, calculate the theoretical channel gain of user and proximal subscribers:
g=d -α
Wherein, d is the distance between the user, and α is the channel fading index;
(1c) base station is corresponding one by one with identify label and the theoretical channel gain of these proximal subscribers, forms the proximal subscribers tabulation;
(1d) user's regular update and upload own positional information makes the base station upgrade the proximal subscribers tabulation.
3. method according to claim 1, step (2) described descending period at transmission frame wherein, the user obtains the ascending resource assignment information and in up period of transmission frame, the user is according to ascending resource assignment information perception proximal subscribers, obtain the tabulation of proximal subscribers power grade and upload the base station, carry out as follows:
(2a) in the descending period of transmission frame, the user intercepts physical downlink control channel PDCCH, obtains ascending resource assignment information and storage;
(2b) in the up period of transmission frame, the user obtains identity information and the received signal power information of proximal subscribers according to ascending resource assignment information perception proximal subscribers;
(2c) user quantizes the signal power that receives, and by the watt level divided rank, forms a proximal subscribers power grade tabulation that comprises proximal subscribers sign, power grade;
(2d) user uploads the proximal subscribers power grade and tabulates to the base station;
(2e) user's repeating step (2a)-(2d) regular update is tabulated and is uploaded to the base station.
4. method according to claim 1, wherein the described base station of step (3) forms the tabulation of the whole network channel gain in conjunction with the proximal subscribers power grade tabulation that channel condition information and user between proximal subscribers tabulation, user and base station upload, and carries out as follows:
(3a) the proximal subscribers power grade tabulation analysis-by-synthesis uploaded in conjunction with channel condition information and user between proximal subscribers tabulation, user and base station of base station, obtain user's identify label, neighbouring relations between user and the proximal subscribers, and the average channel gain between user and the proximal subscribers;
(3b) base station is take User Identity as index, retrieve channel condition information between customer position information and user and base station, and formation user message table, first is User Identity in the user message table, second is channel condition information between user and base station, the 3rd is customer position information, last item guides item for the proximal subscribers table that adds, proximal subscribers table in the user message table is guided a proximal subscribers table that points to the user, the proximal subscribers table comprises the neighbouring relations between user and the proximal subscribers, and the average channel gain between user and the proximal subscribers, user message table and proximal subscribers table consist of the tabulation of the whole network channel gain jointly.
5. method according to claim 1, the criterion of minimum QoS of customer QoS demand in the wherein said step (4) refers under the restriction of maximum transmission power, guarantees that the Signal Interference and Noise Ratio SINR of D2D transmission is not less than the thresholding of base station sets.
6. method according to claim 1, potential bunch of the straight-through D2D of formation terminal in the wherein said step (4), to tabulate according to the whole network channel gain in the base station, judge whether user and proximal subscribers channel condition satisfy and carry out the minimum QoS of customer QoS demand that D2D signal post needs, will satisfy the set of proximal subscribers of this demand as potential bunch of user's D2D.
7. method according to claim 1, wherein step (6) is described selects optimum transmission mode, carries out as follows:
(6a) base station according to the criterion that minimizes total transmitting power, calculates the total transmitting power minimum value under following three kinds of transmission modes, that is: according to the tabulation of the whole network channel gain and service quality QoS demand
Total transmitting power minimum value P under the nonopiate resource multiplex pattern 1:
P 1=min(∑ N-MP C+∑ MP C+∑ MP D)，
Total transmitting power minimum value P under the orthogonal resource multiplexer mode 2:
P 2=min(∑ NP C+∑ MP D)，
Total transmitting power minimum value P under the standard cellular pattern 3:
P 3=min(∑ NP C+∑ 2MP D)，
Wherein, P CThe transmitting power of expression standard cellular communication, P DThe transmitting power of expression D2D communication, N represents to carry out the number of users of standard cellular communication, and M represents to carry out the right quantity of user of D2D communication, and N 〉=M;
(6b) make P Min=min (P 1, P 2, P 3), P MinCorresponding pattern is selected optimal transmission pattern;
(6c) determine the optimal transmission pattern after, with the transmitting power under this pattern, as the power distribution result of optimum.
8. method according to claim 1, wherein the transmission frame in the step (8) is comprised of cellular transmission phase and D2D transmission period, and this two-part length is dynamically adjusted according to network demand, but total transmission frame length remains unchanged, and namely the cellular network transfer resource of eating dishes without rice or wine is constant.
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