CN104284407A - Power control method embedded into D2D cellular network and based on full-duplex relay - Google Patents

Abstract

The invention discloses a power control method embedded into a D2D cellular network and based on a time domain half-duplex relay, and belongs to the technical field of wireless communications. The method relates to a base station B using a point-to-multipoint topological structure cellular network for transmitting, a cellular network receiving terminal C, a D2D transmitting terminal R used as a cellular communication relay and a D2D receiving terminal E; the D2D transmitting terminal is used as a cellular communication relay between the base station B and the receiving terminal C, cellular communication and D2D communication are subjected to combined power control, the full-duplex wireless relay technology is used for achieving orthogonal communication channel frequency spectrum multiplex of the cellular communication and the D2D communication, the minimum data throughout requirement of the cellular communication is met, meanwhile, the throughout of the D2D communication is maximized, hence, the overall performance of the system and the individual performance of users can be considered at the same time, and good balance can be achieved between the system layer and the user layer.

Description

Embed the Poewr control method based on full duplex relaying in the cellular network of D2D

Technical field

The present invention relates to a kind of Poewr control method of full duplex relaying, be particularly useful for the Poewr control method based on full duplex relaying in the cellular network of the embedding D2D used in a kind of wireless communication technology field.

Background technology

Along with the continuous increase of broadband mobile multimedia traffic, improve the user capacity of cellular network, coverage and service quality and become wireless mobile communications important topic urgently to be resolved hurrily.The D2D communication technology is a kind of brand-new wireless communication technology that mobile communication standard is organized 3GPP-LTE to pay close attention in recent years and studied.D2D communication refers to: under the prerequisite not affecting other phone users and D2D user data transmission, and the nearer user terminal in geographical position can not by setting up DCL and carry out transfer of data in base station.Its application advantage comprises: D2D communication can the working frequency range of multiplexing cellular communication, makes full use of rare radio spectrum resources; Closely D2D communication uses lower transmission energy consumption just can obtain higher data throughout and lower data transmission delay; Because user terminal is widely distributed and quantity is more, D2D communication can expand the coverage of cellular cell.

In the cellular network embedding D2D, user terminal independently can select three kinds of communication patterns:

1) cellular communication modes: in this mode, user terminal realizes transfer of data by base station transfer;

2) based on the D2D communication pattern of common transmission: in this mode, D2D communication uses identical time-frequency channel to carry out transfer of data with cellular communication;

3) based on the D2D communication pattern of orthogonal channel transmission: in this mode, D2D communication uses orthogonal time-frequency channel to carry out transfer of data with cellular communication.

Although channel D2D communication pattern can improve the utilization ratio of radio spectrum resources altogether, between D2D communication and cellular communication, comparatively serious mutual interference can be there is.Transmitting power controls, as a kind of effective interference management mechanism, above-mentioned interference to be controlled in tolerance interval.Scholars proposes multiple power control program for the cellular network embedding D2D, is mainly divided into following two kinds of modes to realize:

1) centerized fusion: by base stations being in charge D2D to be communicated and unified management is carried out in synchronous, the power control etc. of cellular communication;

2) distributed AC servo system: D2D terminal needs the disturbance regime of measurement, evaluating network in real time, carries out this locality to its transmitting power and transmitting synchronous and controls.

Because centerized fusion is easy to realize, the common channel D2D communication pattern power control scheme of this patent design adopts centerized fusion mode to realize.

In recent years, wireless relay, as a kind of anti-radio channel multi-path Fading newly, has been widely used in the data throughout improving cellular network, has extended the coverage of cellular cell, and strengthened the service experience of Cell Edge User.The single-hop data link being in deep fading, by adding via node in single hop wireless link, is split into the quality data link of double bounce by wireless relaying technique, thus obtains aforementioned network performance boost.Relaying technique can be divided into following two classes:

1) half-duplex relaying: via node installs an antenna, receives data and relay forwarding data need to take two orthogonal timeslots, and therefore, spectrum utilization efficiency is 1/2;

2) full duplex relaying: via node installs two transmitting antennas, can concurrent receipt data and relay forwarding data on the same channel, and therefore, spectrum utilization efficiency is 1;

Under above-mentioned application and research background, wireless relay is utilized to realize honeycomb

D2D communication in network by Chinese scholars extensive concern, and has proposed following solution:

Document 1:C.Yu, K.Doppler, C.B.Ribeiro, et al, " Resource sharing optimization for device-to-device communication underlaying cellular networks; " IEEE Trans.Wirel.Commun., vol.10, no.8, pp.2752 – 2763,2011. propose a kind of cellular communication based on half-duplex relaying and D2D power of communications control program, and the program under the prerequisite meeting phone user and D2D user's minimum data throughput, can maximize the total throughout of system.But the D2D communication plan that document 1 proposes still needs the via node using base station to communicate as D2D;

Document 2:Y.PeiandY.C.Liang, " Resource allocation for device-to-device communications overlaying two-way cellular networks; " IEEE Trans.Wirel.Commun., vol.12, no.7, pp.3611-3621,2013. propose a kind of cellular communication based on half-duplex, bi-directional relaying and D2D power of communications control program, the program while effectively avoiding throughput of system to reduce, can ensure that phone user and D2D user obtain the data throughput gain of Pareto fairness.But because the downlink data amount of cellular network is considerably beyond upstream data amount, the half-duplex required by the program, bi-directional relaying lack application scenarios in the cellular network of reality, are difficult to apply;

Document 3: Zhou Bin, Hu Honglin. the D2D adaptive cooperation improving multicast efficiency of cellular system retransmits. applied science journal, 2013,31 (3): 221-227.

Document 4:B.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: Beijing University of Post & Telecommunication. the system of selection of D2D and fixed relay two kinds cooperation multicasting mode in cellular system. Chinese invention patent, CN103476140A, 2013-12-25.

Document 3, document 4 and the document 5 two kinds of technology that communicated with D2D by wireless relay combine, for improving the data throughout of wireless multicast business in cellular network.But in the above documents, D2D launch terminal is only used as the via node of auxiliary cellular radio multicast transmission, and itself does not produce any data service, and this and D2D user in practical application need to transmit local data business and do not conform to.

In addition, above-mentioned document 1 to document 5 all adopts half-duplex relaying to realize D2D communication in cellular networks.Owing to using half-duplex relaying, source information transmission and relay data transmission carry out at different time-gap, can not produce mutual interference, and therefore, the problems such as power control and interference management all do not considered by above-mentioned document.

It is multiplexing that full duplex relaying can realize the common channel spectrum that cellular communication communicates with D2D, can obtain the frequency spectrum resource utilization rate doubled than half-duplex relaying in theory.How to realize effective power to control and interference management, full duplex relaying being used for the entire system performance improving the cellular network embedding D2D, is the problem needing to research and solve further.

Summary of the invention

For the weak point of above-mentioned technology, the invention provides a kind of method simple, achieve the common channel multiplexing that cellular communication communicates with D2D, namely ensure that cellular communication can carry out data relay by D2D transmitting terminal, thus increase the coverage of cellular communication, ensure the data throughout of D2D communication simultaneously, obtain the Poewr control method based on full duplex relaying in the cellular network of the embedding D2D of the higher availability of frequency spectrum.

For realizing above-mentioned target, present invention achieves a kind of cellular communication based on full duplex relaying to communicate with D2D joint Power control program, comprise and adopt the base station B of point-to-multipoint topological structure cellular transmission and Cellular Networks to receive receiving terminal C, D2D transmitting terminal R and D2D as cellular communication relaying receives receiving terminal E, form a cellular communications networks communicated by the embedding D2D that base station B controls with reception receiving terminal E by receiving terminal C, transmitting terminal R, described transmitting terminal R is provided with the transmitting antenna and reception antenna that are respectively used to common channels transmit and the information of reception;

Its Poewr control method step is as follows:

A. after base station B sets up the request of communication link by cellular network control channel to receiving terminal C transmission, when the signal strength signal intensity that receiving terminal C receives base station B is more than or equal to preset value, then to base station B feedback information, base station B and receiving terminal C sets up communication link, and now D2D transmitting terminal R only carries out D2D with reception receiving terminal E and communicates;

B. when the signal strength signal intensity that receiving terminal C receives base station B is less than preset value, then do not set up communication link with base station B, now base station B sends data relay request to D2D transmitting terminal R and sets up the first jumping honeycomb trunking traffic link with the antenna of transmitting terminal R, D2D transmitting terminal R sets up the request of communication link again by antenna transmission and receiving terminal C, namely set up second of Cellular Networks with D2D transmitting terminal R and jump trunking traffic link after receiving terminal C receives the request of transmitting terminal R;

C. base station B obtains the channel power gain g at base station B to transmitting terminal R place by Cellular Networks Dedicated Control Channel (SDCCH) _b,Rand the channel power gain g between transmitting terminal R its own transmission antenna and reception electric wire _r,R, the channel power gain g of base station B to receiving terminal C is obtained from receiving terminal C _b,Cwith the channel power gain g of transmitting terminal R to receiving terminal C _r,C, the channel power gain g of base station B to receiving terminal E is obtained from receiving terminal E _b,Ewith the channel power gain g of transmitting terminal R to receiving terminal E _r,E;

D. formula is passed through: ${\mathrm{\γ}}_{B,R}=\frac{p_B{g}_{B,R}}{{\mathrm{\σ}}^2},{\mathrm{\γ}}_{B,C}=\frac{p_B{g}_{B,C}}{{\mathrm{\σ}}^2},{\mathrm{\γ}}_{B,E}=\frac{p_B{g}_{B,E}}{{\mathrm{\σ}}^2}$ Respectively calculation base station B and transmitting terminal R, base station B and receiving terminal C, signal to noise ratio γ between base station B and receiving terminal E _b,R, γ _b,C, γ _b,E, pass through formula: transmitting terminal R and receiving terminal C, signal to noise ratio γ between transmitting terminal R and receiving terminal E _r,C, γ _r,E, due to the self-interference that transmitting terminal R cannot remove double antenna, full duplex relaying causes, so pass through formula signal to Interference plus Noise Ratio between calculation base station B and transmitting terminal R in formula: p _bfor the transmitting power of base station B, p _rfor the transmitting power of transmitting terminal R, the joint Power of base station B and transmitting terminal R is constrained to P, namely has p _b+ p _rthe noise power of=P, transmitting terminal R, receiving terminal C, receiving terminal E is σ ²;

E. formula is passed through: ask for the optimal transmit power of base station B and transmitting terminal R respectively with and pass through formula: ${\mathrm{\&alpha;}}^{\mathrm{opt}}=\min (1,\frac{g_{B,R}{p}_B^{\mathrm{opt}}}{g_{R,C}{p}_R^{\mathrm{opt}}}\&CenterDot;\frac{g_{B,C}{p}_B^{\mathrm{opt}}+g_{R,C}{p}_R^{\mathrm{opt}}+{\mathrm{\&sigma;}}^2}{g_{B,R}{p}_B^{\mathrm{opt}}+g_{R,R}{p}_R^{\mathrm{opt}}+{\mathrm{\&sigma;}}^2}),$ And 0≤α ^opt< 1, asks for the optimal transmit power ratio α that information code element that transmitting terminal R is relaying phone user C distributes ^opt, thus ensure that base station B passes through the normal cellular Network Communication of transmitting terminal R relaying and receiving terminal C, the data throughput maximization that between transmitting terminal R with receiving terminal E, D2D communicates can be ensured again; In formula: G is constant, and for the minimum data throughput of Cellular Networks receiving terminal C retrains, W be cellular communication communicate with D2D share channel width;

F. formula is passed through: calculate the optimum Signal to Interference plus Noise Ratio between transmitting terminal R and receiving terminal C pass through formula: calculate the optimum Signal to Interference plus Noise Ratio between transmitting terminal R and receiving terminal E

G. when time, the optimal transmit power of transmitting terminal R that base station B will obtain in step e with optimal power ratio α ^opt, be transferred to transmitting terminal R by Dedicated Control Channel, control transmitting terminal R and use optimal transmit power with optimal transmit power ratio α ^optrespectively to receiving terminal C and receiving terminal E transmitting data information;

H. when then base station B needs and work under the condition of total transmit power limited, pass through formula: ${\mathrm{\&alpha;}}^{\mathrm{opt}}=\min [1,\max (\frac{G({\mathrm{P\&gamma;}}_{R,C}+1)}{P{(G+1)\mathrm{\&gamma;}}_{R,C}},G\frac{G({\mathrm{\&gamma;}}_{B,C}+{\mathrm{\&gamma;}}_{R,R}+{\mathrm{P\&gamma;}}_{B,C}{\mathrm{\&gamma;}}_{R,R})+{\mathrm{\&gamma;}}_{R,C}({\mathrm{P\&gamma;}}_{B,R}-G)+{\mathrm{\&gamma;}}_{B,R}}{{\mathrm{\&gamma;}}_{R,C}(G+1)({\mathrm{P\&gamma;}}_{B,R}-G)})],$ Regain optimal power ratio α ^opt, and pass through formula: $p_R^{\mathrm{opt}}=\frac{G({\mathrm{P\&gamma;}}_{B,C}+1)}{{\mathrm{\&alpha;}}^{\mathrm{opt}}{(G+1)\mathrm{\&gamma;}}_{R,C}+G({\mathrm{\&gamma;}}_{B,C}-{\mathrm{\&gamma;}}_{R,C})},$ Regain the optimal transmit power of base station B and transmitting terminal R with according to the new optimal power ratio α obtained ^opt, base station B and transmitting terminal R optimal transmit power with pass through formula again the optimum Signal to Interference plus Noise Ratio between transmitting terminal R and receiving terminal C is obtained pass through formula again the optimum Signal to Interference plus Noise Ratio between transmitting terminal R and receiving terminal E is obtained base station B will recalculate the transmitting terminal R optimal transmit power obtained with optimal power ratio α ^optbe transferred to transmitting terminal R by Dedicated Control Channel, control transmitting terminal R and use optimal transmit power with optimal transmit power ratio α ^optrespectively to receiving terminal C and receiving terminal E transmitting data information;

I. base station B uses power to honeycomb receiving terminal C emitted energy normalization information code element x _c, now the use reception antenna of D2D transmitting terminal R obtains code element x _c, to the code element x that base station B launches _ccarry out receiving, decoding process, decoded information code element is d2D transmitting terminal R is by transmitting power α ^opt be loaded into information code element in, by transmitting power (1-α ^opt) be loaded into the energy normalized information code element x launched to receiving terminal E _ein, the transmitting antenna antenna of transmitting terminal R is simultaneously to the receiving terminal C and the receiving terminal E broadcast message code element information that are in accepting state

J., when receiving terminal C receives the data of transmitting terminal R broadcast, receive the signal that base station B launches, the data that base station B launches by receiving terminal C and code element x simultaneously _rin x _epart is used as interference, only right part is decoded; The signal that the transmitting terminal R that receiving terminal E receives simultaneously and base station B launches, the signal that base station B launches by receiving terminal E and code element x _rin part is used as interference, only to x _epart is decoded, and power control procedures terminates.

After in described step b, base station B sends data relay request to D2D transmitting terminal R, transmitting terminal R needs to pass through formula as the via node of cellular communication link: γ _r,C< min{ γ _b,R, γ _b,Cjudge, as formula γ _r,C< min{ γ _b,R, γ _b,Cbe true time, then D2D launches transmitting terminal R as the via node of cellular communication link, even cannot ensure that the base station B of communication quality to receiving terminal C single-hop cellular communication link is split into double bounce data link by being in deep fading; As formula γ _r,C< min{ γ _b,R, γ _b,Cbe fictitious time, then D2D transmitting terminal R cannot improve the channel quality of cellular communication link, and transmitting terminal R does not carry out relaying to base station B to receiving terminal C single-hop cellular communication link;

In described step e under the condition of total transmit power limited, the condition that the joint Power setting up base station B and D2D transmitting transmitting terminal R controls to meet is:

$(p_B^{\mathrm{opt}},p_R^{\mathrm{opt}},{\mathrm{\&alpha;}}^{\mathrm{opt}})=\arg \underset{(p_B,p_R,\mathrm{\&alpha;})}{\max }{T}_E,$

Constraints: $T_C=T_C^{\min },$

p _B+p _R＝P,p _B≥0,p _R≥0，

0≤α＜1，

Wherein, T _eand T _crepresent that D2D receives the data throughout of receiving terminal E and honeycomb reception receiving terminal C respectively:

$T_E=W{\log }_2(1+{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,E}),T_C=W{\log }_2(1+{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{B,R}),{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,E}=\frac{(1-\mathrm{\&alpha;})p_R{\mathrm{\&gamma;}}_{R,E}}{p_B{\mathrm{\&gamma;}}_{B,E}+\mathrm{\&alpha;}{p}_R{\mathrm{\&gamma;}}_{R,E}+1},$

The power proportions that the information code element that α is relaying phone user C for transmitting terminal R distributes;

By above-mentioned calculating thus obtain optimal power control

In described step h under the condition of total transmit power limited, the condition that the joint Power setting up base station B and D2D transmitting transmitting terminal R controls to meet is:

$(p_B^{\mathrm{opt}},p_R^{\mathrm{opt}},{\mathrm{\&alpha;}}^{\mathrm{opt}})=\arg \underset{(p_B,p_R,\mathrm{\&alpha;})}{\max }{T}_E,$

Constraints: $T_C=T_C^{\min },$

p _B+p _R＝P,p _B≥0,p _R≥0，

0≤α＜1，

Wherein, $T_C=W{\log }_2(1+{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,C}),{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,C}=\frac{\mathrm{\&alpha;}{p}_R{g}_{R,C}}{p_B{g}_{B,C}+(1-\mathrm{\&alpha;})p_R{g}_{R,C}+{\mathrm{\&sigma;}}^2};$

By above-mentioned calculating thus obtain optimal power control

Described step h passes through formula $T_C^{\mathrm{opt}}=W{\log }_2(1+\min ({\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{B,R},{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,C}^{\mathrm{opt}}))$ With $T_E^{\mathrm{opt}}=W{\log }_2(1+{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,E}^{\mathrm{opt}})$ Obtain the maximum instantaneous throughput of phone user C and D2D user E respectively with

Beneficial effect: the present invention uses D2D transmitting terminal as the repeater of cellular communication between base station B and receiving terminal C, ensure that D2D transmitting terminal continues to carry out D2D with receiving terminal E while as cellular communication relaying and communicates simultaneously, the common channel spectrum that cellular communication communicates with D2D is realized multiplexing by full duplex relaying technique, improve the frequency spectrum resource utilization ratio of the cellular network embedding D2D, joint Power control is carried out by the power communicated with D2D to the cellular communication of transmitting terminal R, cellular communication and D2D are at identical time-frequency channel concurrent transmission, need not channel resource outside occupying volume, while meeting cellular communication minimum data throughput, maximize the throughput of D2D communication, thus taken into account the individual performance of entire system performance and user, good balance is reached in system level and user level.

Accompanying drawing explanation

Fig. 1 is the structural representation that the present invention embeds the cellular network of D2D;

Fig. 2 to communicate with D2D joint Power control program flow chart based on the cellular communication of full duplex relaying;

Fig. 3 is the change with D2D communication link signal to noise ratio, the throughput comparison diagram of D2D user under different communication modes;

Fig. 4 is the change with honeycomb repeated link signal to noise ratio, the throughput comparison diagram of D2D user under different communication modes.

Embodiment

Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:

As shown in Figure 1, based on the Poewr control method of full duplex relaying in the cellular network of embedding D2D of the present invention, comprise and adopt the base station B of point-to-multipoint topological structure cellular transmission and Cellular Networks to receive receiving terminal C, D2D transmitting terminal R and D2D as cellular communication relaying receives receiving terminal E, form a cellular communications networks communicated by the embedding D2D that base station B controls with reception receiving terminal E by receiving terminal C, transmitting terminal R, described transmitting terminal R is provided with the transmitting antenna and reception antenna that are respectively used to common channels transmit and the information of reception;

As shown in Figure 2, Poewr control method step is as follows:

A. after base station B sets up the request of communication link by cellular network control channel to receiving terminal C transmission, when the signal strength signal intensity that receiving terminal C receives base station B is more than or equal to preset value, then to base station B feedback information, base station B and receiving terminal C sets up communication link, and now D2D transmitting terminal R only carries out D2D with reception receiving terminal E and communicates;

B. when the signal strength signal intensity that receiving terminal C receives base station B is less than preset value, then do not set up communication link with base station B, now base station B sends data relay request to D2D transmitting terminal R and sets up the first jumping honeycomb trunking traffic link with the antenna of transmitting terminal R, D2D transmitting terminal R sets up the request of communication link again by antenna transmission and receiving terminal C, namely set up second of Cellular Networks with D2D transmitting terminal R and jump trunking traffic link after receiving terminal C receives the request of transmitting terminal R;

After described base station B sends data relay request to D2D transmitting terminal R, transmitting terminal R needs to pass through formula as the via node of cellular communication link: γ _r,C< min{ γ _b,R, γ _b,Cjudge, in formula: as formula γ _r,C< min{ γ _b,R, γ _b,Cbe fictitious time, then D2D transmitting terminal R cannot improve the channel quality of cellular communication link, and transmitting terminal R does not carry out relaying to base station B to receiving terminal C single-hop cellular communication link, then method stops; As formula γ _r,C< min{ γ _b,R, γ _b,Cbe true time, then D2D launches transmitting terminal R as the via node of cellular communication link, even cannot ensure that the base station B of communication quality to receiving terminal C single-hop cellular communication link is split into double bounce data link by being in deep fading;

C. base station B obtains the channel power gain g at base station B to transmitting terminal R place by Cellular Networks Dedicated Control Channel (SDCCH) _b,Rand the channel power gain g between transmitting terminal R its own transmission antenna and reception electric wire _r,R, the channel power gain g of base station B to receiving terminal C is obtained from receiving terminal C _b,Cwith the channel power gain g of transmitting terminal R to receiving terminal C _r,C, the channel power gain g of base station B to receiving terminal E is obtained from receiving terminal E _b,Ewith the channel power gain g of transmitting terminal R to receiving terminal E _r,E;

D. formula is passed through: ${\mathrm{\&gamma;}}_{B,R}=\frac{p_B{g}_{B,R}}{{\mathrm{\&sigma;}}^2},{\mathrm{\&gamma;}}_{B,C}=\frac{p_B{g}_{B,C}}{{\mathrm{\&sigma;}}^2},{\mathrm{\&gamma;}}_{B,E}=\frac{p_B{g}_{B,E}}{{\mathrm{\&sigma;}}^2}$ Respectively calculation base station B and transmitting terminal R, base station B and receiving terminal C, signal to noise ratio γ between base station B and receiving terminal E _b,R, γ _b,C, γ _b,E, pass through formula: transmitting terminal R and receiving terminal C, signal to noise ratio γ between transmitting terminal R and receiving terminal E _r,C, γ _r,E, due to the self-interference that transmitting terminal R cannot remove double antenna, full duplex relaying causes, so pass through formula signal to Interference plus Noise Ratio between calculation base station B and transmitting terminal R in formula: p _bfor the transmitting power of base station B, p _rfor the transmitting power of transmitting terminal R, the joint Power of base station B and transmitting terminal R is constrained to P, namely has p _b+ p _rthe noise power of=P, transmitting terminal R, receiving terminal C, receiving terminal E is σ ²;

E. as formula γ _r,C< min{ γ _b,R, γ _b,Cbe true time, owing to adopting trunk protocol again of decoding, base station B anticipation Signal to Interference plus Noise Ratio with optimum Signal to Interference plus Noise Ratio between close be and under the condition of total transmit power limited, the joint Power control mathematical model setting up base station B and D2D transmitting transmitting terminal R is:

$(p_B^{\mathrm{opt}},p_R^{\mathrm{opt}},{\mathrm{\&alpha;}}^{\mathrm{opt}})=\arg \underset{(p_B,p_R,\mathrm{\&alpha;})}{\max }{T}_E,$

Constraints: $T_C=T_C^{\min },$

p _B+p _R＝P,p _B≥0,p _R≥0，

0≤α＜1，

Wherein, T _eand T _crepresent the data throughout of D2D user E and phone user C respectively:

$T_E=W{\log }_2(1+{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,E}),T_C=W{\log }_2(1+{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{B,R}),{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,E}=\frac{(1-\mathrm{\&alpha;})p_R{\mathrm{\&gamma;}}_{R,E}}{p_B{\mathrm{\&gamma;}}_{B,E}+\mathrm{\&alpha;}{p}_R{\mathrm{\&gamma;}}_{R,E}+1},$

α represents the power proportions that the information code element that transmitting terminal R is relaying phone user C distributes; By solving above-mentioned Mathematical Modeling, obtaining optimal power control strategy is:

Pass through formula: ask for the optimal transmit power of base station B and transmitting terminal R respectively with and pass through formula: ${\mathrm{\&alpha;}}^{\mathrm{opt}}=\min (1,\frac{g_{B,R}{p}_B^{\mathrm{opt}}}{g_{R,C}{p}_R^{\mathrm{opt}}}\&CenterDot;\frac{g_{B,C}{p}_B^{\mathrm{opt}}+g_{R,C}{p}_R^{\mathrm{opt}}+{\mathrm{\&sigma;}}^2}{g_{B,R}{p}_B^{\mathrm{opt}}+g_{R,R}{p}_R^{\mathrm{opt}}+{\mathrm{\&sigma;}}^2}),$ And 0≤α ^opt< 1, asks for the optimal transmit power ratio α that information code element that transmitting terminal R is relaying phone user C distributes ^opt, thus ensure that base station B passes through the normal cellular Network Communication of transmitting terminal R relaying and receiving terminal C, the data throughput maximization that between transmitting terminal R with receiving terminal E, D2D communicates can be ensured again; In formula: G is constant, and for the minimum data throughput of Cellular Networks receiving terminal C retrains, W be cellular communication communicate with D2D share channel width;

F. formula is passed through: calculate the optimum Signal to Interference plus Noise Ratio between transmitting terminal R and receiving terminal C pass through formula: calculate the optimum Signal to Interference plus Noise Ratio between transmitting terminal R and receiving terminal E

G. when time, the optimal transmit power of transmitting terminal R that base station B will obtain in step e with optimal power ratio α ^opt, be transferred to transmitting terminal R by Dedicated Control Channel, control transmitting terminal R and use optimal transmit power with optimal transmit power ratio α ^optrespectively to receiving terminal C and receiving terminal E transmitting data information;

H. when then base station B needs and work under the condition of total transmit power limited, need to recalculate optimum power control strategy; ? and under the condition of total transmit power limited, base station B sets up the joint Power control mathematical model that base station B and D2D launches transmitting terminal R:

$(p_B^{\mathrm{opt}},p_R^{\mathrm{opt}},{\mathrm{\&alpha;}}^{\mathrm{opt}})=\arg \underset{(p_B,p_R,\mathrm{\&alpha;})}{\max }{T}_E,$

Constraints: $T_C=T_C^{\min },$

p _B+p _R＝P,p _B≥0,p _R≥0，

0≤α＜1，

Wherein, $T_C=W{\log }_2(1+{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,C}),{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,C}=\frac{\mathrm{\&alpha;}{p}_R{g}_{R,C}}{p_B{g}_{B,C}+(1-\mathrm{\&alpha;})p_R{g}_{R,C}+{\mathrm{\&sigma;}}^2};$ By solving above-mentioned Mathematical Modeling, pass through formula: ${\mathrm{\&alpha;}}^{\mathrm{opt}}=\min [1,\max (\frac{G({\mathrm{P\&gamma;}}_{R,C}+1)}{P{(G+1)\mathrm{\&gamma;}}_{R,C}},G\frac{G({\mathrm{\&gamma;}}_{B,C}+{\mathrm{\&gamma;}}_{R,R}+{\mathrm{P\&gamma;}}_{B,C}{\mathrm{\&gamma;}}_{R,R})+{\mathrm{\&gamma;}}_{R,C}({\mathrm{P\&gamma;}}_{B,R}-G)+{\mathrm{\&gamma;}}_{B,R}}{{\mathrm{\&gamma;}}_{R,C}(G+1)({\mathrm{P\&gamma;}}_{B,R}-G)})],$ Regain optimal power ratio α ^opt, and pass through formula: $p_R^{\mathrm{opt}}=\frac{G({\mathrm{P\&gamma;}}_{B,C}+1)}{{\mathrm{\&alpha;}}^{\mathrm{opt}}{(G+1)\mathrm{\&gamma;}}_{R,C}+G({\mathrm{\&gamma;}}_{B,C}-{\mathrm{\&gamma;}}_{R,C})},$ Regain the optimal transmit power of base station B and transmitting terminal R with according to the new optimal power ratio α obtained ^opt, base station B and transmitting terminal R optimal transmit power with pass through formula again the optimum Signal to Interference plus Noise Ratio between transmitting terminal R and receiving terminal C is obtained pass through formula again the optimum Signal to Interference plus Noise Ratio between transmitting terminal R and receiving terminal E is obtained base station B will recalculate the transmitting terminal R optimal transmit power obtained with optimal power ratio α ^optbe transferred to transmitting terminal R by Dedicated Control Channel, control transmitting terminal R and use optimal transmit power with optimal transmit power ratio α ^optrespectively to receiving terminal C and receiving terminal E transmitting data information;

I. base station B uses power to honeycomb receiving terminal C emitted energy normalization information code element x _c, now the use reception antenna of D2D transmitting terminal R obtains code element x _c, to the code element x that base station B launches _ccarry out receiving, decoding process, decoded information code element is d2D transmitting terminal R is by transmitting power α ^opt be loaded into information code element in, by transmitting power (1-α ^opt) be loaded into the energy normalized information code element x launched to receiving terminal E _ein, the transmitting antenna antenna of transmitting terminal R is simultaneously to the receiving terminal C and the receiving terminal E broadcast message code element information that are in accepting state

J., when receiving terminal C receives the data of transmitting terminal R broadcast, receive the signal that base station B launches, the data that base station B launches by receiving terminal C and code element x simultaneously _rin x _epart is used as interference, only right part is decoded; The signal that the transmitting terminal R that receiving terminal E receives simultaneously and base station B launches, the signal that base station B launches by receiving terminal E and code element x _rin part is used as interference, only to x _epart is decoded, and passes through formula: with obtain the maximum instantaneous throughput of honeycomb receiving terminal C and D2D receiving terminal E respectively with

Inventions have been Multi simulation running and implement test, lower mask body introduces embodiment and performance evaluation thereof.The beehive network system of emulation embodiment embedding D2D as shown in Figure 1, user's receiving terminal C is the phone user being in cell edge, and user's transmitting terminal R and receiving terminal E adopts D2D pattern communication.Suppose that honeycomb receiving terminal C performs voice communication service, minimum data throughput demand is 20Kbit/s, and the simulation parameter of other embodiments is preset as shown in the table:

In emulation is implemented, the minimum data throughput of honeycomb receiving terminal C is maintained at 20Kbit/s all the time, no longer illustrates with figure.

By the signal to noise ratio γ between transmitting terminal R and receiving terminal C _r,Cbe fixed as 5dB, with reference to Fig. 3, introduce the data throughout of D2D receiving terminal E along with γ _r,Ethe relation schematic diagram of change.As shown in Figure 3, as self-interference channel signal to noise ratio (the i.e. γ of the transmitting terminal R as full duplex relaying _r,R) when being controlled in below 15dB, the D2D communication pattern that the present invention is based on full duplex relaying can obtain the data throughout higher than conventional half duplex relaying D2D communication pattern, this is because full duplex repeater mode is under identical consumption conditions, obtain the frequency spectrum resource utilization ratio of higher than half-duplex repeater mode 1 times.

By the signal to noise ratio γ between transmitting terminal R and receiving terminal E _r,Ebe fixed as 5dB, with reference to Fig. 4, introduce the data throughout of D2D receiving terminal E along with γ _r,Cthe relation schematic diagram of change.As shown in Figure 4, γ is worked as _r,Rwhen being controlled in below 15dB, the D2D communication pattern that the present invention is based on full duplex relaying still can obtain the data throughout higher than conventional half duplex relaying D2D communication pattern.

Claims (5)

1. one kind embeds the Poewr control method based on full duplex relaying in the cellular network of D2D, comprise and adopt the base station B of point-to-multipoint topological structure cellular transmission and Cellular Networks to receive receiving terminal C, D2D transmitting terminal R and D2D as cellular communication relaying receives receiving terminal E, form a cellular communications networks communicated by the embedding D2D that base station B controls with reception receiving terminal E by receiving terminal C, transmitting terminal R, described transmitting terminal R is provided with the transmitting antenna and reception antenna that are respectively used to common channels transmit and the information of reception, it is characterized in that step is as follows:

A. after base station B sets up the request of communication link by cellular network control channel to receiving terminal C transmission, when the signal strength signal intensity that receiving terminal C receives base station B is more than or equal to preset value, then to base station B feedback information, base station B and receiving terminal C sets up communication link, and now D2D transmitting terminal R only carries out D2D with reception receiving terminal E and communicates;

B. when the signal strength signal intensity that receiving terminal C receives base station B is less than preset value, then do not set up communication link with base station B, now base station B sends data relay request to D2D transmitting terminal R and sets up the first jumping honeycomb trunking traffic link with the antenna of transmitting terminal R, D2D transmitting terminal R sets up the request of communication link again by antenna transmission and receiving terminal C, namely set up second of Cellular Networks with D2D transmitting terminal R and jump trunking traffic link after receiving terminal C receives the request of transmitting terminal R;

C. base station B obtains the channel power gain g at base station B to transmitting terminal R place by Cellular Networks Dedicated Control Channel (SDCCH) _b,Rand the channel power gain g between transmitting terminal R its own transmission antenna and reception electric wire _r,R, the channel power gain g of base station B to receiving terminal C is obtained from receiving terminal C _b,Cwith the channel power gain g of transmitting terminal R to receiving terminal C _r,C, the channel power gain g of base station B to receiving terminal E is obtained from receiving terminal E _b,Ewith the channel power gain g of transmitting terminal R to receiving terminal E _r,E;

D. formula is passed through: ${\mathrm{\&gamma;}}_{B,R}=\frac{p_B{g}_{B,R}}{{\mathrm{\&sigma;}}^2},{\mathrm{\&gamma;}}_{B,C}=\frac{p_B{g}_{B,C}}{{\mathrm{\&sigma;}}^2},{\mathrm{\&gamma;}}_{B,E}=\frac{p_B{g}_{B,E}}{{\mathrm{\&sigma;}}^2}$ Respectively calculation base station B and transmitting terminal R, base station B and receiving terminal C, signal to noise ratio γ between base station B and receiving terminal E _b,R, γ _b,C, γ _b,E, pass through formula: transmitting terminal R and receiving terminal C, signal to noise ratio γ between transmitting terminal R and receiving terminal E _r,C, γ _r,E, due to the self-interference that transmitting terminal R cannot remove double antenna, full duplex relaying causes, so pass through formula signal to Interference plus Noise Ratio between calculation base station B and transmitting terminal R in formula: p _bfor the transmitting power of base station B, p _rfor the transmitting power of transmitting terminal R, the joint Power of base station B and transmitting terminal R is constrained to P, namely has p _b+ p _rthe noise power of=P, transmitting terminal R, receiving terminal C, receiving terminal E is σ ²;

E. formula is passed through: $p_B^{\text{opt}}=\frac{G(P{g}_{R,R}+{\mathrm{\&sigma;}}^2)}{G{g}_{R,R}+g_{B,R}},p_R^{\mathrm{opt}}=\frac{{\mathrm{Pg}}_{B,R}-G}{{\mathrm{Gg}}_{R,R}+g_{B,R}}$ Ask for the optimal transmit power of base station B and transmitting terminal R respectively with and pass through formula: ${\mathrm{\&alpha;}}^{\mathrm{opt}}=\min (1,\frac{g_{B,R}{p}_B^{\mathrm{opt}}}{g_{R,C}{p}_R^{\mathrm{opt}}}\&CenterDot;\frac{g_{B,C}{p}_B^{\mathrm{opt}}+g_{R,C}{p}_R^{\mathrm{opt}}+{\mathrm{\&sigma;}}^2}{g_{B,R}{p}_B^{\mathrm{opt}}+g_{R,R}{p}_R^{\mathrm{opt}}+{\mathrm{\&sigma;}}^2}),$ And 0≤α ^opt< 1, asks for the optimal transmit power ratio α that information code element that transmitting terminal R is relaying phone user C distributes ^opt, thus ensure that base station B passes through the normal cellular Network Communication of transmitting terminal R relaying and receiving terminal C, the data throughput maximization that between transmitting terminal R with receiving terminal E, D2D communicates can be ensured again; In formula: G is constant, and for the minimum data throughput of Cellular Networks receiving terminal C retrains, W be cellular communication communicate with D2D share channel width;

F. formula is passed through: calculate the optimum Signal to Interference plus Noise Ratio between transmitting terminal R and receiving terminal C pass through formula: calculate the optimum Signal to Interference plus Noise Ratio between transmitting terminal R and receiving terminal E

G. when time, the optimal transmit power of transmitting terminal R that base station B will obtain in step e with optimal power ratio α ^opt, be transferred to transmitting terminal R by Dedicated Control Channel, control transmitting terminal R and use optimal transmit power with optimal transmit power ratio α ^optrespectively to receiving terminal C and receiving terminal E transmitting data information;

H. when then base station B needs and work under the condition of total transmit power limited, pass through formula: ${\mathrm{\&alpha;}}^{\mathrm{opt}}=\min [1,\max (\frac{G({\mathrm{P\&gamma;}}_{R,C}+1)}{P(G+1){\mathrm{\&gamma;}}_{R,C}},G\frac{G({\mathrm{\&gamma;}}_{B,C}+{\mathrm{\&gamma;}}_{R,R}+{\mathrm{P\&gamma;}}_{B,C}{\mathrm{\&gamma;}}_{R,R})+{\mathrm{\&gamma;}}_{R,C}({\mathrm{P\&gamma;}}_{B,R}-G)+{\mathrm{\&gamma;}}_{B,R}}{{\mathrm{\&gamma;}}_{R,C}(G+1)({\mathrm{R\&gamma;}}_{B,R}-G)})],$ Regain optimal power ratio α ^opt, and pass through formula: regain the optimal transmit power of base station B and transmitting terminal R with according to the new optimal power ratio α obtained ^opt, base station B and transmitting terminal R optimal transmit power with pass through formula again the optimum Signal to Interference plus Noise Ratio between transmitting terminal R and receiving terminal C is obtained pass through formula again the optimum Signal to Interference plus Noise Ratio between transmitting terminal R and receiving terminal E is obtained base station B will recalculate the transmitting terminal R optimal transmit power obtained with optimal power ratio α ^optbe transferred to transmitting terminal R by Dedicated Control Channel, control transmitting terminal R and use optimal transmit power with optimal transmit power ratio α ^optrespectively to receiving terminal C and receiving terminal E transmitting data information;

I. base station B uses power to honeycomb receiving terminal C emitted energy normalization information code element x _c, now the use reception antenna of D2D transmitting terminal R obtains code element x _c, to the code element x that base station B launches _ccarry out receiving, decoding process, decoded information code element is d2D transmitting terminal R is by transmitting power be loaded into information code element in, by transmitting power be loaded into the energy normalized information code element x launched to receiving terminal E _ein, the transmitting antenna antenna of transmitting terminal R is simultaneously to the receiving terminal C and the receiving terminal E broadcast message code element information that are in accepting state

J., when receiving terminal C receives the data of transmitting terminal R broadcast, receive the signal that base station B launches, the data that base station B launches by receiving terminal C and code element x simultaneously _rin x _epart is used as interference, only right part is decoded; The signal that the transmitting terminal R that receiving terminal E receives simultaneously and base station B launches, the signal that base station B launches by receiving terminal E and code element x _rin part is used as interference, only to x _epart is decoded, and power control procedures terminates.

2. the Poewr control method embedded based on full duplex relaying in the cellular network of D2D according to claim 1, is characterized in that: after in described step b, base station B sends data relay request to D2D transmitting terminal R, transmitting terminal R needs to pass through formula as the via node of cellular communication link: γ _r,C< min{ γ _b,R, γ _b,Cjudge, as formula γ _r,C< min{ γ _b,R, γ _b,Cbe true time, then D2D launches transmitting terminal R as the via node of cellular communication link, even cannot ensure that the base station B of communication quality to receiving terminal C single-hop cellular communication link is split into double bounce data link by being in deep fading; As formula γ _r,C< min{ γ _b,R, γ _b,Cbe fictitious time, then D2D transmitting terminal R cannot improve the channel quality of cellular communication link, and transmitting terminal R does not carry out relaying to base station B to receiving terminal C single-hop cellular communication link.

3. the Poewr control method embedded based on full duplex relaying in the cellular network of D2D according to claim 1, it is characterized in that: in described step e under the condition of total transmit power limited, the condition that the joint Power setting up base station B and D2D transmitting transmitting terminal R controls to meet is:

$(p_B^{\mathrm{opt}},p_R^{\mathrm{opt}},{\mathrm{\&alpha;}}^{\mathrm{opt}})=\arg \underset{(p_B,p_R,\mathrm{\&alpha;})}{\max }{T}_E,$

Constraints: $T_C=T_C^{\min },$

p _B+p _R＝P,p _B≥0,p _R≥0，

0≤α＜1，

Wherein, T _eand T _crepresent that D2D receives the data throughout of receiving terminal E and honeycomb reception receiving terminal C respectively:

$T_E=W{\log }_2(1+{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,E}),T_C=W{\log }_2(1+{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{B,R}),{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,E}=\frac{(1-\mathrm{\&alpha;})p_R{\mathrm{\&gamma;}}_{R,E}}{p_B{\mathrm{\&gamma;}}_{B,E}+\mathrm{\&alpha;}{p}_R{\mathrm{\&gamma;}}_{R,E}+1},$

The power proportions that the information code element that α is relaying phone user C for transmitting terminal R distributes;

By above-mentioned calculating thus obtain optimal power control

4. the Poewr control method embedded based on full duplex relaying in the cellular network of D2D according to claim 1, it is characterized in that: in described step h under the condition of total transmit power limited, the condition that the joint Power setting up base station B and D2D transmitting transmitting terminal R controls to meet is:

$(p_B^{\mathrm{opt}},p_R^{\mathrm{opt}},{\mathrm{\&alpha;}}^{\mathrm{opt}})=\arg \underset{(p_B,p_R,\mathrm{\&alpha;})}{\max }{T}_E,$

Constraints: $T_C=T_C^{\min },$

p _B+p _R＝P,p _B≥0,p _R≥0，

0≤α＜1，

Wherein, $T_C=W{\log }_2(1+{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,C}),{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,C}=\frac{\mathrm{\&alpha;}{p}_R{g}_{R,C}}{p_B{g}_{B,C}+(1-\mathrm{\&alpha;})p_R{g}_{R,C}+{\mathrm{\&sigma;}}^2};$

By above-mentioned calculating thus obtain optimal power control

5. the Poewr control method embedded based on full duplex relaying in the cellular network of D2D according to claim 1, is characterized in that: described step h passes through formula $T_C^{\mathrm{opt}}=W{\log }_2(1+\min ({\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{B,R},{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,C}^{\mathrm{opt}}))$ With $T_E^{\mathrm{opt}}=W{\log }_2(1+{\stackrel{\&OverBar;}{\mathrm{\&gamma;}}}_{R,E}^{\mathrm{opt}})$ Obtain the maximum instantaneous throughput of phone user C and D2D user E respectively with