CN104284407B - Poewr control method based on full duplex relaying in the cellular network of embedded D2D - Google Patents
Poewr control method based on full duplex relaying in the cellular network of embedded D2D Download PDFInfo
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- H—ELECTRICITY
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- H04W52/04—TPC
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- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
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Abstract
Poewr control method based on time domain half-duplex relay in a kind of D2D cellular networks, uses suitable for wireless communication technology field.Including using the base station B of point-to-multipoint topological structure cellular transmission and cellular network receiving end C, D2D transmitting terminals R and D2D as cellular communication relaying receive terminal E, it uses repeater of the D2D transmitting terminals as cellular communication between base station B and receiving terminal C, joint Power control is carried out to cellular communication and D2D communications, the orthogonal channel spectrum reuse of cellular communication and D2D communications is realized using full duplex radio relaying technique, while cellular communication minimum data throughput is met, maximize the handling capacity of D2D communications, it can be with the individual performance of user so as to take into account systematic entirety, reach good balance in system level and user level.
Description
Technical Field
The invention relates to a power control method of full-duplex relay, in particular to a power control method based on full-duplex relay in a cellular network embedded with D2D, which is used in the technical field of wireless communication.
Background
With the increasing of broadband mobile multimedia traffic, improving the user capacity, coverage and service quality of cellular networks becomes an important issue to be solved urgently in wireless mobile communication. The D2D communication technology is a new wireless communication technology that has been focused and researched by the mobile communication standardization organization 3GPP-LTE in recent years. D2D communication means: on the premise of not influencing data transmission of other cellular users and D2D users, the user terminals with the closer geographical positions can establish direct communication links for data transmission without relaying through the base station. The application advantages include: the D2D communication can multiplex the working frequency band of cellular communication, and make full use of scarce wireless spectrum resources; the short-distance D2D communication can obtain higher data throughput and lower data transmission delay by using lower transmission energy consumption; due to the wide distribution and large number of user terminals, D2D communication can expand the coverage area of a cell.
In a cellular network with D2D embedded, a user terminal may autonomously select three communication modes:
1) cellular communication mode: in this mode, the user terminal realizes data transmission by means of base station transfer;
2) D2D communication mode based on co-channel transmission: in this mode, D2D communication uses the same time-frequency channel for data transmission as cellular communication;
3) D2D communication mode based on orthogonal channel transmission: in this mode, D2D communication and cellular communication use orthogonal time-frequency channels for data transmission.
Although the co-channel D2D communication mode can improve the utilization efficiency of the wireless spectrum resources, there is a serious mutual interference between the D2D communication and the cellular communication. Transmit power control is an effective interference management mechanism that can control the interference to within an acceptable range. Various power control schemes are proposed by various scholars aiming at a cellular network embedded with D2D, and the schemes are mainly realized in two ways:
1) centralized control: the base station is responsible for uniformly managing the synchronization, power control and the like of the D2D communication and the cellular communication;
2) distributed control: the D2D terminal needs to measure and evaluate the interference condition of the network in real time, and locally control its transmission power and transmission synchronization.
Because centralized control is easy to implement, the co-channel D2D communication mode power control scheme designed by the patent is implemented in a centralized control manner.
In recent years, wireless relaying, as a new technology against wireless channel multipath fading, has been widely used to improve data throughput of cellular networks, extend coverage of cells, and enhance service experience of cell-edge users. In the wireless relay technology, a relay node is added into a single-hop wireless link, and the single-hop data link in deep fading is split into two-hop high-quality data links, so that the network performance improvement is obtained. Relay technologies can be divided into the following two categories:
1) half-duplex relaying: the relay node is provided with an antenna, and two orthogonal time slots are occupied for receiving data and relaying and forwarding the data, so that the frequency spectrum utilization efficiency is 1/2;
2) full duplex relay: the relay node is provided with two transmitting antennas, and can receive data and relay forwarding data on the same channel concurrently, so that the frequency spectrum utilization efficiency is 1;
in the context of the above applications and research, the implementation of cellular using wireless relays
D2D communication in the network has been widely noticed by domestic and foreign scholars, and the following solutions have been proposed:
document 1: yu, k.doppler, c.b.ribeiro, et al, "Resource sharing optimization for device-to-device communication interfacing cellular networks," ieee transactions, wire.communication, vol.10, No.8, pp.2752-2763,2011, proposes a half-duplex relay based cellular communication and D2D communication power control scheme that can maximize the total throughput of the system on the premise of meeting the minimum data throughput for cellular users and D2D users. However, the D2D communication scheme proposed in document 1 still requires the use of a base station as a relay node for D2D communication;
document 2: y.edition y.c. liang, "Resource allocation for device-to-device communication overlapping two-way cellular networks," ieee trans.wire.communication ", vol.12, No.7, pp.3611-3621,2013, proposes a cellular communication and D2D communication power control scheme based on half duplex and two-way relay, which can guarantee that cellular users and D2D users obtain data throughput gain of Pareto fairness while effectively avoiding system throughput reduction. However, since the downlink data volume of the cellular network far exceeds the uplink data volume, the half-duplex and bidirectional relay required by the scheme lack application scenes in the actual cellular network, and are difficult to popularize and apply;
document 3: bin, husband, kunren, adaptive cooperative retransmission of D2D that improves multicast efficiency of cellular systems, application science bulletins, 2013,31(3):221-227.
Document 4: zhou, h.hu, s. -q.huang and h. -h.chen, "Intracluster device-to-device relay algorithm with optimal resource utilization," ieee trans. vehicular Technology, vol.62, No.5, pp.2315-2326,2013.
Document 5: the invention discloses a selection method of two cooperative multicast modes of D2D and fixed relay in a cellular system, China invention patent, CN103476140A, 2013-12-25.
Documents 3, 4 and 5 combine two technologies of wireless relay and D2D communication for improving data throughput of wireless multicast traffic in a cellular network. However, in the above document, the D2D transmitting terminal is only used as a relay node to assist cellular wireless multicast transmission, and does not generate any data traffic itself, which is inconsistent with the need for transmitting local data traffic by the D2D user in practical applications.
Further, each of the above-mentioned documents 1 to 5 implements D2D communication in a cellular network using half-duplex relay. Since the half-duplex relay is used, the source information transmission and the relay data transmission are performed in different time slots, and mutual interference is not generated, so that the above documents do not consider the problems of power control, interference management and the like.
Full-duplex relay can realize the co-channel spectrum multiplexing of cellular communication and D2D communication, and theoretically can obtain the spectrum resource utilization rate which is twice as high as that of half-duplex relay. How to realize effective power control and interference management is a problem to be solved by further research, and the full-duplex relay is used for improving the overall system performance of the cellular network embedded with the D2D.
Disclosure of Invention
Aiming at the defects of the technology, the invention provides the power control method based on the full-duplex relay in the cellular network embedded with the D2D, which is simple in method, realizes the common channel multiplexing of cellular communication and D2D communication, namely ensures that the cellular communication can carry out data transfer through a D2D transmitting terminal, thereby increasing the coverage range of the cellular communication, simultaneously ensuring the data throughput of the D2D communication and obtaining higher spectrum utilization rate.
In order to achieve the above object, the present invention implements a combined power control scheme for cellular communication and D2D communication based on full-duplex relay, including a base station B and a cellular receiving terminal C, which use point-to-multipoint topological structure cellular network transmission, a D2D transmitting terminal R and a D2D receiving terminal E, which serve as cellular communication relays, to form a cellular communication network embedded with D2D communication, which is controlled by the base station B, from the receiving terminal C, the transmitting terminal R and the receiving terminal E, wherein the transmitting terminal R is provided with a transmitting antenna and a receiving antenna, which are respectively used for co-channel transmission and information reception;
the power control method comprises the following steps:
a. after the base station B sends a request for establishing a communication link to the receiving terminal C through a cellular network control channel, when the receiving terminal C receives that the signal intensity of the base station B is greater than or equal to a preset value, the base station B feeds back information to the base station B, the base station B establishes the communication link with the receiving terminal C, and at the moment, the transmitting terminal R and the receiving terminal E of the D2D only carry out D2D communication;
b. when the signal intensity of the base station B received by the receiving terminal C is smaller than the preset value, a communication link is not established with the base station B, at the moment, the base station B sends a data relay request to the D2D transmitting terminal R and establishes a first hop cellular relay communication link with an antenna of the transmitting terminal R, the D2D transmitting terminal R transmits a request for establishing a communication link with the receiving terminal C through the antenna, and after receiving the request of the transmitting terminal R, the receiving terminal C establishes a second hop cellular relay communication link with the D2D transmitting terminal R cellular network;
c. base station B via cellular network dedicated control channel(SDCCH) obtaining channel power gain g at base station B to transmitting end RB,RAnd the channel power gain g between the transmitting end R's own transmitting antenna and the receiving wireR,RObtaining the channel power gain g from the base station B to the receiving end C from the receiving end CB,CAnd the channel power gain g from the transmitting end R to the receiving end CR,CObtaining the channel power gain g from the base station B to the receiving end E from the receiving end EB,EAnd the channel power gain g from the transmitting end R to the receiving end ER,E；
f. By the formula:calculating the optimal signal-to-interference-and-noise ratio between the transmitting end R and the receiving end CBy the formula:calculating the optimal signal-to-interference-and-noise ratio between the transmitting end R and the receiving end E
g. When in useWhen the base station B obtains the optimal transmitting power of the transmitting terminal R obtained in the step eand the optimum power ratio αoptIs transmitted to a transmitting terminal R through a special control channel to control transmissionTerminal R uses the optimal transmission powerand an optimum transmit power ratio αoptRespectively transmitting data information to a receiving end C and a receiving end E;
i. base station B uses powerTransmitting energy normalization information code element x to cellular receiving end CCWhen the receiving antenna of the transmitting end R of D2D is used to obtain the symbol xCFor symbols x transmitted by base station BCPerforming receiving and decoding processing, the decoded information code element isD2D transmitting terminal R will transmit power αopt Loaded on information symbolsin (1- α) transmitting poweropt)Loaded onto energy-normalized information symbols x transmitted to the receiving end EEIn the method, a transmitting antenna of a transmitting terminal R simultaneously broadcasts information code element information to a receiving terminal C and a receiving terminal E which are in a receiving state
j. Receiving end C receiving and transmitting end R wideWhen broadcasting data, the receiving end C receives the data transmitted by the base station B and the code element x at the same timeRX in (2)EPartly as interference, only toPartially decoding; the receiving end E receives the signals transmitted by the transmitting end R and the base station B simultaneously, and the receiving end E transmits the signals transmitted by the base station B and the code element xRIn (1)Partly as interference, only for xEAnd partially decoding, and ending the power control flow.
In the step B, after the base station B sends the data relay request to the D2D transmitting end R, the transmitting end R needs to pass a formula as a relay node of the cellular communication link: gamma rayR,C＜min{γB,R,γB,CJudging when the formula gamma isR,C＜min{γB,R,γB,CWhen the data rate is true, the D2D transmits a transmitting terminal R as a relay node of a cellular communication link, and splits a single-hop cellular communication link from a base station B to a receiving terminal C, which are in deep fading or even unable to ensure communication quality, into two-hop data links; when the formula gammaR,C＜min{γB,R,γB,CIf yes, the D2D transmitting end R can not improve the channel quality of the cellular communication link, and the transmitting end R does not relay the single-hop cellular communication link from the base station B to the receiving end C;
in the step e, under the condition that the total transmission power is limited, the condition that the joint power control of the base station B and the transmission end R of D2D is satisfied is established as follows:
pB+pR＝P,pB≥0,pR≥0，
0≤α＜1，
wherein, TEAnd TCData throughput for D2D receiving receiver E and cellular receiving receiver C, respectively:
α is the power proportion distributed by the information code element of the relay cellular user C by the transmitting terminal R;
obtaining the optimal power control by the above calculation
In the step h, under the condition that the total transmission power is limited, the condition that the joint power control of the base station B and the transmission end R of D2D is satisfied is established as follows:
pB+pR＝P,pB≥0,pR≥0，
0≤α＜1，
obtaining the optimal power control by the above calculation
Has the advantages that: the invention uses the D2D transmitting terminal as a repeater of cellular communication between the base station B and the receiving terminal C, and simultaneously ensures that the D2D transmitting terminal continues to carry out D2D communication with the receiving terminal E while being used as a cellular communication relay, realizes the co-channel spectrum multiplexing of cellular communication and D2D communication by a full-duplex relay technology, improves the utilization efficiency of spectrum resources of a cellular network embedded with D2D, and maximizes the throughput of D2D communication while meeting the minimum data throughput of cellular communication by carrying out combined power control on the cellular communication of the transmitting terminal R and the power of D2D communication and carrying out concurrent transmission on the same time-frequency channel with the cellular communication and D2D without occupying additional channel resources, thereby taking the overall performance of the system and the individual performance of users into account and achieving good balance on the system level and the user level.
Drawings
FIG. 1 is a schematic diagram of the structure of a D2D embedded cellular network of the present invention;
fig. 2 is a flow diagram of a full duplex relay based cellular communication and D2D communication joint power control scheme;
FIG. 3 is a graph of throughput versus different communication modes for a D2D user as a function of signal-to-noise ratio for the D2D communication link;
fig. 4 is a graph of throughput versus different communication modes for a D2D user as a function of the signal-to-noise ratio of the cellular relay link.
Detailed Description
An embodiment of the invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, the power control method based on full-duplex relay in the D2D-embedded cellular network of the present invention includes using a base station B and a cellular network receiving terminal C for cellular network transmission in a point-to-multipoint topology structure, and using D2D transmitting terminal R and D2D receiving terminal E as cellular communication relays, to form a D2D-embedded cellular communication network controlled by the base station B through the receiving terminal C, the transmitting terminal R and the receiving terminal E, where the transmitting terminal R is provided with a transmitting antenna and a receiving antenna for co-channel transmission and reception of information, respectively;
as shown in fig. 2, the power control method comprises the following steps:
a. after the base station B sends a request for establishing a communication link to the receiving terminal C through a cellular network control channel, when the receiving terminal C receives that the signal intensity of the base station B is greater than or equal to a preset value, the base station B feeds back information to the base station B, the base station B establishes the communication link with the receiving terminal C, and at the moment, the transmitting terminal R and the receiving terminal E of the D2D only carry out D2D communication;
b. when the signal intensity of the base station B received by the receiving terminal C is smaller than the preset value, a communication link is not established with the base station B, at the moment, the base station B sends a data relay request to the D2D transmitting terminal R and establishes a first hop cellular relay communication link with an antenna of the transmitting terminal R, the D2D transmitting terminal R transmits a request for establishing a communication link with the receiving terminal C through the antenna, and after receiving the request of the transmitting terminal R, the receiving terminal C establishes a second hop cellular relay communication link with the D2D transmitting terminal R cellular network;
after the base station B sends a data relay request to the D2D transmitting end R, the transmitting end R needs to pass a formula as a relay node of a cellular communication link: gamma rayR,C＜min{γB,R,γB,CJudging, wherein:when the formula gammaR,C＜min{γB,R,γB,CIf yes, the D2D transmitting end R cannot improve the channel quality of the cellular communication link,the transmitting end R does not relay the single-hop cellular communication link from the base station B to the receiving end C, and the method is terminated; when the formula gammaR,C＜min{γB,R,γB,CWhen the data rate is true, the D2D transmits a transmitting terminal R as a relay node of a cellular communication link, and splits a single-hop cellular communication link from a base station B to a receiving terminal C, which are in deep fading or even unable to ensure communication quality, into two-hop data links;
c. base station B obtains channel power gain g from base station B to transmitting end R through cellular network special control channel (SDCCH)B,RAnd the channel power gain g between the transmitting end R's own transmitting antenna and the receiving wireR,RObtaining the channel power gain g from the base station B to the receiving end C from the receiving end CB,CAnd the channel power gain g from the transmitting end R to the receiving end CR,CObtaining the channel power gain g from the base station B to the receiving end E from the receiving end EB,EAnd the channel power gain g from the transmitting end R to the receiving end ER,E；
e. When the formula gammaR,C＜min{γB,R,γB,CWhen true, the base station B prejudges the signal-to-interference-and-noise ratio due to the adoption of a decoding and relaying protocolAnd optimal SINRThe relationship between isAnd under the condition that the total transmitting power is limited, a joint power control mathematical model of the transmitting end R of the base station B and the D2D is established as follows:
pB+pR＝P,pB≥0,pR≥0，
0≤α＜1，
wherein, TEAnd TCData throughputs for D2D user E and cellular user C, respectively:
and alpha represents the power proportion distributed by the information code element of the relay cellular user C by the transmitting terminal R, and the optimal power control strategy obtained by solving the mathematical model is as follows:
f. by the formula:calculating the optimal signal-to-interference-and-noise ratio between the transmitting end R and the receiving end CBy the formula:calculating the optimal signal-to-interference-and-noise ratio between the transmitting end R and the receiving end E
g. When in useThen, the base station B will stepe the optimal transmitting power of the transmitting terminal R obtained in the stepand the optimum power ratio αoptTransmitting to the transmitting terminal R through a special control channel, and controlling the transmitting terminal R to use the optimal transmitting powerand an optimum transmit power ratio αoptRespectively transmitting data information to a receiving end C and a receiving end E;
h. when in useThen base station B needs to be atWorking under the condition that the total transmitting power is limited, and recalculating an optimal power control strategy; in thatAnd under the condition that the total transmitting power is limited, the base station B establishes a joint power control mathematical model of the base station B and a transmitting end R of D2D:
pB+pR＝P,pB≥0,pR≥0，
0≤α＜1，
i. base station B uses powerTransmitting energy normalization information code element x to cellular receiving end CCWhen the receiving antenna of the transmitting end R of D2D is used to obtain the symbol xCFor symbols x transmitted by base station BCPerforming receiving and decoding processing, the decoded information code element isD2D transmitting terminal R will transmit power αopt Loaded on information symbolsin (1- α) transmitting poweropt)Loaded onto energy-normalized information symbols x transmitted to the receiving end EEIn the method, a transmitting antenna of a transmitting terminal R simultaneously broadcasts information code element information to a receiving terminal C and a receiving terminal E which are in a receiving state
j. When receiving end C receives data broadcast by transmitting end R, it receives signal transmitted by base station B at the same time, and the receiving end C transmits data and code element x transmitted by base station BRX in (2)EPartly as interference, only toPartially decoding; transmitting terminal R and base station B transmission received by receiving terminal E simultaneouslyThe receiving end E transmits the signal transmitted by the base station B and the code element xRIn (1)Partly as interference, only for xEPartially decoding, by the formula:andmaximum instantaneous throughputs for cellular receiver C and D2D receiver E, respectively, are obtainedAnd
the present invention has been subjected to a number of simulation experiments, and the following detailed description of the embodiments and their performance analyses. Simulation implementation of a cellular network system embedded with D2D as shown in fig. 1, a user receiver C is a cellular user at the cell edge, and a user transmitter R and a receiver E communicate using a D2D mode. Assuming that the cellular receiving end C performs voice communication service and the minimum data throughput requirement is 20Kbit/s, simulation parameters of other embodiments are preset as shown in the following table:
in the simulation implementation, the minimum data throughput of the cellular receiver C is always maintained at 20Kbit/s, not shown graphically.
The signal-to-noise ratio gamma between a transmitting end R and a receiving end C is measuredR,CFixed at 5dB, reference is made to FIG. 3, which describes the data throughput at receiver E of D2D as a function of γR,ESchematic diagram of the relationship of the changes. As can be seen from fig. 3, the self-interference channel signal-to-noise ratio (i.e. γ) of the transmitting end R when acting as a full-duplex relayR,R) Controlled below 15dB, the D2D communication mode based on full-duplex relay according to the present invention can obtain higher data throughput than the conventional D2D communication mode of half-duplex relay, because the full-duplex relay mode obtains 1 times higher spectrum resource utilization efficiency than the half-duplex relay mode under the same power consumption condition.
The signal-to-noise ratio gamma between a transmitting end R and a receiving end E is measuredR,EFixed at 5dB, reference is made to FIG. 4, which describes the data throughput at receiver E of D2D as a function of γR,CSchematic diagram of the relationship of the changes. As can be seen from FIG. 4, when γ isR,RControlled below 15dB, the D2D communication mode based on full-duplex relay of the present invention can still achieve higher data throughput than the conventional D2D communication mode of half-duplex relay.
Claims (5)
1. A power control method based on full-duplex relay in a cellular network embedded with D2D comprises a base station B and a cellular network receiving terminal C which adopt point-to-multipoint topological structure cellular network transmission, and a D2D transmitting terminal R and a D2D receiving terminal E which are used as cellular communication relay, so as to form a cellular communication network embedded with D2D communication, wherein the receiving terminal C, the transmitting terminal R and the receiving terminal E are controlled by the base station B, the transmitting terminal R is provided with a transmitting antenna and a receiving antenna which are respectively used for co-channel transmission and information receiving, and the power control method is characterized by comprising the following steps:
a. after the base station B sends a request for establishing a communication link to the receiving terminal C through a cellular network control channel, when the receiving terminal C receives that the signal intensity of the base station B is greater than or equal to a preset value, the base station B feeds back information to the base station B, the base station B establishes the communication link with the receiving terminal C, and at the moment, the transmitting terminal R and the receiving terminal E of the D2D only carry out D2D communication;
b. when the signal intensity of the base station B received by the receiving terminal C is smaller than the preset value, a communication link is not established with the base station B, at the moment, the base station B sends a data relay request to the D2D transmitting terminal R and establishes a first hop cellular relay communication link with an antenna of the transmitting terminal R, the D2D transmitting terminal R transmits a request for establishing a communication link with the receiving terminal C through the antenna, and after receiving the request of the transmitting terminal R, the receiving terminal C establishes a second hop cellular relay communication link with the D2D transmitting terminal R cellular network;
c. base station B obtains channel power gain g from base station B to transmitting end R through cellular network special control channel (SDCCH)B,RAnd the channel power gain g between the transmitting end R's own transmitting antenna and the receiving wireR,RObtaining the channel power gain g from the base station B to the receiving end C from the receiving end CB,CAnd the channel power gain g from the transmitting end R to the receiving end CR,CObtaining the channel power gain g from the base station B to the receiving end E from the receiving end EB,EAnd the channel power gain g from the transmitting end R to the receiving end ER,E；
d. By the formula:respectively calculating the signal-to-noise ratios gamma between the base station B and the transmitting terminal R, between the base station B and the receiving terminal C, and between the base station B and the receiving terminal EB,R、γB,C、γB,EBy the formula:respectively calculating the signal-to-noise ratio gamma between the transmitting end R and the receiving end C and between the transmitting end R and the receiving end ER,C、γR,ESince the transmitting end R can not remove the self-interference caused by double-antenna and full-duplex relay, the formula is usedCalculating the signal-to-interference-and-noise ratio between the base station B and the transmitting terminal RIn the formula: p is a radical ofBIs the transmission power, p, of base station BRFor the transmit power of the transmitting end R, the combined power of the base station B and the transmitting end R is constrained to be P, i.e. there is PB+pRP, the noise power of the transmitting end R, the receiving end C, and the receiving end E are all σ2；
e. By the formula:respectively calculating the optimal transmitting power of the base station B and the transmitting terminal RAndand by the formula:and 0 is not less than αopt< 1, the optimal transmitting power ratio alpha distributed by the transmitting end R for the information code element of the cellular network receiving end C is obtainedoptTherefore, the base station B is ensured to communicate with the normal cellular network of the receiving terminal C through the relay of the transmitting terminal R, and the data throughput of D2D communication between the transmitting terminal R and the receiving terminal E is also ensured to be maximized; in the formula: g is a constant, andfor the minimum data throughput constraint of the cellular network receiving end C, W is the channel bandwidth shared by cellular communication and D2D communication;
f. by the formula:calculating the optimal signal-to-interference-and-noise ratio between the transmitting end R and the receiving end CBy the formula:calculating the optimal signal-to-interference-and-noise ratio between the transmitting end R and the receiving end E
g. When in useWhen the base station B obtains the optimal transmitting power of the transmitting terminal R obtained in the step eand the optimum power ratio αoptTransmitting to the transmitting terminal R through a special control channel, and controlling the transmitting terminal R to use the optimal transmitting powerand an optimum transmit power ratio αoptRespectively transmitting data information to a receiving end C and a receiving end E;
h. when in useThen base station B needs to be atAnd operating under the condition that the total transmitting power is limited, and obtaining the following formula:reacquiring the optimum power ratio αoptAnd by the formula: reacquiring the optimal transmission power of the base station B and the transmitting terminal RAndaccording to the newly obtained optimal power ratio alphaoptOptimal transmission power of base station B and transmitting terminal RAndby the formulaThe optimal signal to interference and noise ratio between the transmitting end R and the receiving end C is obtained againBy the formulaThe optimal signal to interference and noise ratio between the transmitting end R and the receiving end E is obtained againThe base station B recalculates the optimal transmitting power of the transmitting terminal Rand the optimum power ratio αoptTransmitting to the transmitting terminal R through a special control channel, and controlling the transmitting terminal R to use the optimal transmitting powerand an optimum transmit power ratio αoptAre respectively provided withTransmitting data information to a receiving end C and a receiving end E;
i. base station B uses powerTransmitting energy normalization information code element x to cellular receiving end CCWhen the transmitting end R of D2D obtains the symbol x by using the receiving antennaCFor symbols x transmitted by base station BCPerforming receiving and decoding processing, the decoded information code element isD2D transmitting terminal R will transmit power αopt Loaded on information symbolsIn the middle, the power will be transmittedLoaded onto energy-normalized information symbols x transmitted to the receiving end EEIn the method, a transmitting antenna of a transmitting terminal R simultaneously broadcasts information code element information to a receiving terminal C and a receiving terminal E which are in a receiving state
j. When receiving end C receives data broadcast by transmitting end R, it receives signal transmitted by base station B at the same time, and the receiving end C transmits data and code element x transmitted by base station BRX in (2)EPartly as interference, only toPartially decoding; the receiving end E receives the signals transmitted by the transmitting end R and the base station B simultaneously, and the receiving end E transmits the signals transmitted by the base station B and the code element xRIn (1)Partly as interference, only for xEAnd partially decoding, and ending the power control flow.
2. The method for full-duplex relay-based power control in a D2D-embedded cellular network as claimed in claim 1, wherein: in the step B, after the base station B sends the data relay request to the D2D transmitting end R, the transmitting end R needs to pass a formula as a relay node of the cellular communication link: gamma rayR,C＜min{γB,R,γB,CJudging when the formula gamma isR,C＜min{γB,R,γB,CWhen the data rate is true, the D2D transmitting end R is used as a relay node of a cellular communication link, and a single-hop cellular communication link from a base station B to a receiving end C, which is in deep fading or even cannot ensure communication quality, is split into two-hop data links; when the formula gammaR,C＜min{γB,R,γB,CIf yes, the D2D transmitting end R cannot improve the channel quality of the cellular communication link, and the transmitting end R does not relay the single-hop cellular communication link from the base station B to the receiving end C.
3. The method for full-duplex relay-based power control in a D2D-embedded cellular network as claimed in claim 1, wherein: in the step e, under the condition that the total transmission power is limited, the condition that the joint power control of the base station B and the D2D transmitting terminal R is satisfied is established as follows:
constraint conditions are as follows:
pB+pR＝P,pB≥0,pR≥0，
0≤α＜1，
wherein, TEAnd TCRespectively, D2DData throughput for receiver E and cellular receiver C:
α is the power proportion distributed by the information code element of the relay cellular user C by the transmitting terminal R;
obtaining the optimal power control by the above calculation
4. The method for full-duplex relay-based power control in a D2D-embedded cellular network as claimed in claim 1, wherein: in the step h, under the condition that the total transmission power is limited, the condition that the joint power control of the base station B and the D2D transmitting terminal R is satisfied is established as follows:
constraint conditions are as follows:
pB+pR＝P,pB≥0,pR≥0，
0≤α＜1，
wherein,
obtaining the optimal power control by the above calculation
5. The method of claim 1 for full-duplex relay-based power control in a D2D-embedded cellular network, wherein the method is characterized in thatIn the following steps: the step h is represented by the formulaAndmaximum instantaneous throughputs for cellular user C and D2D user E, respectively, are obtainedAnd
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| CN106303910B (en) | 2015-05-29 | 2020-01-10 | 北京智谷睿拓技术服务有限公司 | Method and device for controlling communication between devices |
| CN106303909A (en) | 2015-05-29 | 2017-01-04 | 北京智谷睿拓技术服务有限公司 | Communication between devices control method, communication between devices method and device thereof |
| CN106303908B (en) | 2015-05-29 | 2019-11-29 | 北京智谷睿拓技术服务有限公司 | Communication device between communication between devices method and apparatus |
| CN106303911B (en) | 2015-05-29 | 2020-09-01 | 北京智谷睿拓技术服务有限公司 | Interference measuring method and interference measuring device |
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| CN105554805A (en) * | 2015-12-07 | 2016-05-04 | 中国矿业大学 | In-band full duplex D2D communication link interference elimination method used for cellular network |
| CN105722016B (en) * | 2016-02-05 | 2019-05-17 | 中国矿业大学 | It is layered the cooperative control method of gateway and terminal transmission power in M2M network |
| IT201600072521A1 (en) * | 2016-07-12 | 2018-01-12 | Inst Rundfunktechnik Gmbh | MOBILFUNKKOMMUNIKATION MIT VERBESSERTER SENDE- UND EMPFANGSQUALITÄT |
| CN106255133B (en) * | 2016-08-05 | 2019-11-22 | 桂林电子科技大学 | A kind of energy efficiency optimization method based on full duplex bi-directional relaying D2D network |
| CN107295623B (en) * | 2017-06-12 | 2018-04-20 | 华中科技大学 | The communication means and full duplex relaying system of a kind of full duplex relaying system |
| CN107182116B (en) * | 2017-06-20 | 2019-12-10 | 北京邮电大学 | Interference control method based on power distribution in full duplex cellular mobile communication system |
| CN108064077B (en) * | 2017-12-15 | 2019-11-26 | 西安电子科技大学 | The power distribution method of full duplex D2D in cellular network |
| CN108600999B (en) * | 2018-04-19 | 2020-07-28 | 西安交通大学 | FD-D2D joint optimization method based on channel allocation and power control |
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