CN106686683B - A kind of distribution of D2D power of communications and relay selection method based on network code - Google Patents
A kind of distribution of D2D power of communications and relay selection method based on network code Download PDFInfo
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- CN106686683B CN106686683B CN201710125373.5A CN201710125373A CN106686683B CN 106686683 B CN106686683 B CN 106686683B CN 201710125373 A CN201710125373 A CN 201710125373A CN 106686683 B CN106686683 B CN 106686683B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/46—TPC being performed in particular situations in multi hop networks, e.g. wireless relay networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0076—Distributed coding, e.g. network coding, involving channel coding
- H04L1/0077—Cooperative coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention belongs to wireless communication technology fields, disclose a kind of distribution of D2D power of communications and relay selection method based on network code, carry out optimal power allocation for each alternative relay node；Selecting can wherein make the maximum relay node of D2D link channel capacity as optimal relay node.The present invention combines network code, relaying technique and D2D communication, and the availability of frequency spectrum of hybrid network can be improved with lower cost, solves the network coverage and service quality problem；System scenarios for phone user as two-way relay nodes, under the premise of terminal direct connection link transmissions general power is certain, optimal power allocation has been carried out to the node of terminal direct connection chain road, have selected optimal relay node, compared to other power distributions and relay selection algorithm, terminal direct connection link channel capacity can be made to reach maximum.
Description
Technical field
The invention belongs to wireless communication technology field more particularly to a kind of D2D power of communications distribution based on network code
And relay selection method.
Background technique
In order to guarantee the communication quality and safety of local service, third generation partner program (thethird
Generation PartnerProject, 3GPP) by terminal direct connection communication (Device-to-Device, D2D) technology the bottom of as
Layer network is applied in cellular network, and International Telecommunication Union wirelessly communicates the committee (International
Telecommunications Union-Radio CommunicationsSector, ITU-R) D2D is classified as the following channel radio
One of key technology of letter, to increase the spectrum utilization efficiency, the load for mitigating base station, the transmitting for reducing terminal and base station of system
Power promotes overall channel capacity.However become far suddenly when deep fading or space length occur for the channel between D2D user
When, static phone user communicates as relay node cooperation D2D, can be in the premise for not increasing wireless communications network base station number
Under, the network coverage and service quality problem are solved with lower cost.On the other hand, network code allows intermediate node to information
It is handled, thoroughly overturned people all the time allows to carry out while multi-way radio communication to the understanding of interference signal, into
And improve transmission rate and channel capacity.Therefore network code is applied in D2D communication, for analyzing and solving hybrid network
The problems such as interference coordination in network, is with critically important application value.D2D user and its related skill are introduced in former cellular network
Art also necessarily will lead to while improving system performance and more complicated interfere with each other problem.Therefore, how reasonably will in
It is applied in D2D communication after technology and network code, interference is effectively managed, practicable transmission plan is designed, makes
D2D communication performance is further improved and is a problem to be solved.System field for phone user as two-way relay nodes
Scape, currently available technology is not under the premise of comprehensively considering the QoS requirement of cellular link and D2D link, by D2D
Communication, relay transmission technology and network code combine, and complete power distribution and relay selection method are designed, further to have
D2D communication advantage is expanded on effect ground.
Summary of the invention
In view of the problems of the existing technology, the D2D power of communications distribution based on network code that the present invention provides a kind of
And relay selection method.
The invention is realized in this way a kind of distribution of D2D power of communications and relay selection method based on network code, institute
It states the distribution of D2D power of communications and relay selection method based on network code and realizes the channel capacity for maximizing D2D communication link
Target mathematical model are as follows:
s.t.2|hbd|2pd≤I0；
|hbk|2pk≤I0；
2pd+pk=P；
0<pd,pk<P；
Wherein, pdIndicate the transmission power of D2D user, pkIndicate the transmission power of relay node, pnIndicate phone user's
Power is sent, h indicates the channel information between D2D user and relay node, hck、hcdIt respectively indicates phone user and relaying saves
Channel information between point, D2D user, hbd、hbkRespectively indicate the channel information between base station and D2D user, relay node, P
Indicate the total emission power of D2D user and relay node, I0Indicate the tolerable interference threshold value in base station, N0For noise power.
The D2D power of communications distribution based on network code is expressed as；
Wherein pk=P-2pd,s1=| hck|2pn
+N0> 0, s2=| hcd|2pn+N0>0。
The objective function of the relay selection of the D2D communication based on network code are as follows:
Wherein corresponding k* (1≤k*≤ L) be selection optimal relay node, h*,hck *,hcd *,hbd *,hbk *As pair
Answer the channel coefficients of optimal relay node.
Further, the distribution of D2D power of communications and relay selection method based on network code specifically includes following step
It is rapid:
Step 1, base station obtain channel information at this time, determine total emission power P, the tolerable interference threshold value I in base station0,
Optional relay node k is initialized as 1；
Step 2 calculates s1=| hck|2pn+N0, s2=| hcd|2pn+N0,
Step 3 judges pd' (k) value, ifThen
When selecting k-th of relay node, the corresponding optimal transmission power of D2D user is pd *(k)=pd' (k), execute step 5；Otherwise,
Execute step 4；
Step 4 calculates separately IfOtherwise
Step 5, by the p of acquirementd *(k) it substitutes into and calculatesIt obtains
Maximum value r of the D2D to the dry ratio of letter at relay node kd(k)；
Step 6, update k=k+1, until k be less than relay node number L, perform the next step, otherwise execute step 2 after
Continuous iteration；
Step 7, all r obtained in comparison step fived(k)(1≤k*≤ L), select wherein maximum value rd(k*), it is right
The k answered*As optimal relay node, pd *(k) it is optimum power value that D2D user should distribute.
The D2D power of communications distribution that another object of the present invention is to provide a kind of using described based on network code is in
After the terminal direct connection communication system of selection method.
Advantages of the present invention and good effect are as follows: D2D communication, relay transmission technology and network code are combined, designed
Complete power distribution and relay selection method improve the channel capacity of D2D communication with lower cost；It is used for honeycomb
System scenarios of the family as two-way relay nodes, under the premise of terminal direct connection link transmissions general power is certain, to terminal direct connection
The node of chain road has carried out optimal power allocation, has selected optimal relay node.It is provided by the invention compared with other technologies
Technical solution can make terminal direct connection link channel capacity reach maximum.
Detailed description of the invention
Fig. 1 is the D2D power of communications distribution provided in an embodiment of the present invention based on network code and relay selection method stream
Cheng Tu.
Fig. 2 is the power distribution and relay selection method of the D2D communication provided in an embodiment of the present invention based on network code
Specific implementation flow chart.
Fig. 3 is system model figure provided in an embodiment of the present invention.
Fig. 4 is the relational graph of D2D link channel capacity and total emission power provided in an embodiment of the present invention.
Fig. 5 is the relational graph of D2D link channel capacity provided in an embodiment of the present invention and optional relaying number.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to limit
The fixed present invention.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
As shown in Figure 1, the distribution of D2D power of communications and relay selection side provided in an embodiment of the present invention based on network code
Method the following steps are included:
S101: optimal power allocation is carried out for each alternative relay node；
S102: selecting can wherein make the maximum relay node of D2D link channel capacity as optimal relay node.
Application principle of the invention is further described with reference to the accompanying drawing.
As shown in Fig. 2, the distribution of D2D power of communications and relay selection side provided in an embodiment of the present invention based on network code
Method is to realize the target for the channel capacity for maximizing D2D communication link, provides mathematical model:
s.t.2|hbd|2pd≤I0
|hbk|2pk≤I0；
2pd+pk=P
0<pd,pk<P
Wherein, pdIndicate the transmission power of D2D user, pkIndicate the transmission power of relay node, pnIndicate phone user's
Power is sent, h indicates the channel information between D2D user and relay node, hck、hcdIt respectively indicates phone user and relaying saves
Channel information between point, D2D user, hbd、hbkRespectively indicate the channel information between base station and D2D user, relay node, P
Indicate the total emission power of D2D user and relay node, I0Indicate the tolerable interference threshold value in base station, N0For noise power.
Optimal power allocation includes:
(1) objective function of optimal power allocation subproblem is simplified are as follows:
To solve above-mentioned nonlinear restriction planning problem, order:
Wherein pk=P-2pd,s1=| hck|2pn
+N0> 0, s2=| hcd|2pn+N0>0。
Assuming that this subchannel meets the requirement of D2D communication, i.e.,Optimal power allocation subproblem
It can convert are as follows:
(2) objective function f (pd) first derivative, second dervative is respectively as follows:
Therefore in pdWhen (0,0.5P) ∈, f (pd) it is lower concave function, problem has unique globe optimum, and is f (pd)
In pdMinimum point on ∈ (0,0.5P) enablesSolve minimum point are as follows:
Consider constraint conditionpd≠ 0, pd≠ 0.5P, so:
If i)Then pdAcquirement optimal solution is pd *=
pd'。
Ii) ifThen pdOptimal solution is obtained in boundary value, is enabledAnd it enables:
Work as rd 1 ≥rd 2When,Otherwise
To sum up, work as pd=pd *When, problem obtains optimal solution, and D2D is to the acquirement maximum channel capacity at relay node k are as follows:
Optimal relay selection includes:
Due to selecting the difference of relay node, the channel coefficients between each node are not also identical, and each relay node is carried out
After optimal power distribution, the maximum relay node of D2D link channel capacity can be made by selecting, this node is best relay
Node.
The objective function of best relay selection are as follows:
Wherein corresponding k*(1≤k*≤ L) be selection optimal relay node, h*,hck *,hcd *,hbd *,hbk *As pair
The channel coefficients of optimal relay node are answered, D2D is to the acquirement maximum channel capacity at relay node k* at this time are as follows:
The distribution of D2D power of communications and relay selection method provided in an embodiment of the present invention based on network code specifically includes
Following steps:
Step 1, base station obtain channel information at this time, determine total emission power P, the tolerable interference threshold value I in base station0,
Optional relay node k is initialized as 1；
Step 2 calculates s1=| hck|2pn+N0, s2=| hcd|2pn+N0,
Step 3 judges pd' (k) value, ifThen
When selecting k-th of relay node, the corresponding optimal transmission power of D2D user is pd *(k)=pd' (k), execute step 5；Otherwise,
Execute step 4；
Step 4 calculates separately IfOtherwise
Step 5, by the p of acquirementd *(k) it substitutes into and calculatesIt obtains
Maximum value r of the D2D to the dry ratio of letter at relay node kd(k)；
Step 6, update k=k+1, until k be less than relay node number L, perform the next step, otherwise execute step 2 after
Continuous iteration.
Step 7, all r obtained in comparison step fived(k)(1≤k*≤ L), select wherein maximum value rd(k*), it is right
The k answered*As optimal relay node, pd *(k) it is optimum power value that D2D user should distribute.
As shown in figure 3, each node is uniformly distributed in the cell, wherein L by the central controlled single cellular system scene in base station
A static state phone user is alternative relay node.Assuming that up-link is divided into multiple orthogonal sub-channels, and every sub-channels are only
The phone user being active individually is given, the uplink frequency spectrum resource of every sub-channels can at most be used by a D2D
Family is to multiplexing.Assuming that tie link, D2D user i and D2D user j are not present between D2D user using physical-layer network coding
Mode, is divided to two time slots to realize two-way communication by a relay node, this D2D is upper to multiplexing phone user n (1≤n≤N)
Line link frequency spectrum resource.
First time slot is multiple access access phase, and D2D user i and j sends signal x to relay node simultaneously1And x2, honeycomb use
Family c sends signal x to base stationn, superposed signal expression formula that k-th of relay node receives:
Second time slot is broadcast phase, the signal amplification forwarding that relay node will receive.D2D user i and j are received
Signal yi' and yj' respectively indicate are as follows:
yi'=β hikyk+hcixn+n0yj'=β hjkyk+hcjxn+n0；
WhereinFor the amplification coefficient of relay node.
After the self-interference removal that the signal message that D2D user i and j is sent according to itself receives it in the second time slot
Expression formula are as follows:
yi=β h2x2+βhhckxn+βhn0+hcixn+n0 yj=β h2x1+βhhckxn+βhn0+hcjxn+n0；
Assuming that channel is symmetric channel, corresponding Signal to Interference plus Noise Ratio (SINR) are as follows:
Assuming that the transmission power of D2D user i and j is identical, when k-th of relay node is selected, corresponding D2D link
Channel capacity can indicate are as follows:
On the other hand, D2D can interfere the uplink frequency spectrum resource of multiplexing phone user n to base station, in order to guarantee bee
The normal communication of nest user, D2D user should be less than the interference of base station the interference threshold value I of base station tolerance0, it may be assumed that
Ibn1=| hbi|2p1+|hbj|2p2≤I0 Ibn2=| hbk|2pk≤I0；
Wherein Ibn1Indicate the interference that the first time slot D2D user generates base station, Ibn2Indicate the second time slot D2D user to base
Stand generate interference.
Application effect of the invention is explained in detail below with reference to emulation.
Emulation of the invention uses Matlab7.10.0 simulation software, and simulation parameter is provided that
Each channel coefficientsIt is mutually indepedent with additive white Gaussian noise, andn0~N (0,1), bee
The transmission power of nest user is pn=50dB, cellular network the patient jamming power upper limit I from D2D link0=
30dB.All simulation results are all experience 1*106Average value after secondary channel realization.
The method of proposition and other three kinds of methods are subjected to simulation comparison, wherein optimal power allocation and random relaying choosing
(Optimal PowerAllocation and Random Relay Selection, OPRR) method is selected to refer to first in each
Optimal power allocation is carried out after node, then therefrom randomly selects a relay node；Random power distribution and best relay choosing
(Random PowerAllocation and Optimal Relay Selection, RPOR) method is selected to refer to each relaying
Node first carries out random power distribution, and then selecting makes the maximized relay node of channel capacity；Random power distribution and random
Relay selection (Random Power Allocation and Random RelaySelection, RPRR) method refers to every
A relay node first carries out random power distribution, then therefrom randomly selects a relay node.
Fig. 4 gives D2D link channel capacity with the change curve of total emission power.Assuming that relay node number is L=20.
As seen from the figure, the channel capacity of the corresponding D2D link of four kinds of methods all increases with the increase of D2D link transmissions general power
Greatly, but the corresponding D2D link maximum channel capacity of OPOR method proposed by the present invention is apparently higher than other methods, and with chain
The increase of road total emission power, advantage become apparent.Such as when D2D total emission power is 120dB, the mentioned method pair of the present invention
The D2D link channel capacity answered is approximately 1.25 times of OPRR method, is approximately 7.33 times of RPOR method, is approximately RPRR method
8.80 again.This illustrates that the method that the present invention is mentioned will be substantially better than other three methods.
Fig. 5 gives D2D link channel capacity with the change curve of optional relaying number.D2D link is assumed in emulation
Total emission power is P=80dB.As seen from the figure: i) for mentioned OPOR method of the invention and RPOR method, due to
To improve the channel capacity of D2D link, therefore the number for increasing optional relay node can increase the selectivity of relay node
With the increase of relay node number, D2D link maximum channel capacity corresponding to both methods also continues to increase, but this hair
The performance advantage of bright mentioned method becomes apparent with the increase of L.Ii) for other two methods, because being random relaying choosing
The channel capacity of selection method, D2D link will not increase with the increase of relay node number.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (2)
1. a kind of distribution of D2D power of communications and relay selection method based on network code, which is characterized in that described to be based on network
The D2D power of communications distribution of coding and relay selection method realize the target mathematics for maximizing the channel capacity of D2D communication link
Model are as follows:
s.t.2|hbd|2pd≤I0；
|hbk|2pk≤I0；
2pd+pk=P；
0<pd,pk<P；
Wherein, pdIndicate the transmission power of D2D user, pkIndicate the transmission power of relay node, pnIndicate the transmission of phone user
Power, h indicate the channel information between D2D user and relay node, hck、hcdRespectively indicate phone user and relay node,
Channel information between D2D user, hbd、hbkRespectively indicate the channel information between base station and D2D user, relay node, P table
Show the total emission power of D2D user and relay node, I0Indicate the tolerable interference threshold value in base station, N0For noise power；
The D2D power of communications distribution based on network code is expressed as；
Wherein pk=P-2pd,s1=| hck|2pn+
N0> 0, s2=| hcd|2pn+N0>0；
The objective function of the relay selection of the D2D communication based on network code are as follows:
Wherein corresponding k*(1≤k*≤ L) be selection optimal relay node, h*,hck *,hcd *,hbd *,hbk *It as corresponds to most
The channel coefficients of good relay node；
It is described based on network code D2D power of communications distribution and relay selection method specifically includes the following steps:
Step 1, base station obtain channel information at this time, determine total emission power P, the tolerable interference threshold value I in base station0, can
Relay node k is selected to be initialized as 1；
Step 2 calculates s1=| hck|2pn+N0, s2=| hcd|2pn+N0,
Step 3 judges pd' (k) value, ifThen select
When k relay node, the corresponding optimal transmission power of D2D user is pd *(k)=pd' (k), execute step 5；Otherwise, step is executed
Rapid four；
Step 4 calculates separately If
rd 1(k)≥rd 2(k),Otherwise
Step 5, by the p of acquirementd *(k) it substitutes into and calculatesIt obtains
Maximum value r of the D2D to the Signal to Interference plus Noise Ratio at relay node kd(k)；
Step 6, update k=k+1, until k be less than relay node number L, perform the next step, otherwise execute step 2 continue to change
Generation；
Step 7, all r obtained in comparison step fived(k)(1≤k*≤ L), select wherein maximum value rd(k*), it is corresponding
k*As optimal relay node, pd *(k) it is optimum power value that D2D user should distribute.
2. a kind of terminal using D2D power of communications distribution and relay selection method described in claim 1 based on network code
Direct communication system.
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| CN109450513A (en) * | 2018-10-17 | 2019-03-08 | 扬州大学 | The more relay system transmission methods of cooperation based on non-orthogonal multiple access technology |
| CN109661026A (en) * | 2018-12-06 | 2019-04-19 | 南京邮电大学 | A kind of D2D alternative routing system power distribution method based on NOMA |
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| Title |
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| D2D系统中的功率分配和中继选择算法研究;贲佳振;《中国优秀硕士学位论文全文数据库信息科技辑》;20170331;全文 * |
| Network Coding in Device-to-device (D2D)Communications Underlaying Cellular Networks;Yue Wu;《2015 IEEE International Conference on Communications (ICC)》;20150930;全文 * |
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