CN106686683A - D2D (Device-to-Device) communication power distribution and relay selection method based on network coding - Google Patents
D2D (Device-to-Device) communication power distribution and relay selection method based on network coding Download PDFInfo
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- CN106686683A CN106686683A CN201710125373.5A CN201710125373A CN106686683A CN 106686683 A CN106686683 A CN 106686683A CN 201710125373 A CN201710125373 A CN 201710125373A CN 106686683 A CN106686683 A CN 106686683A
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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
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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
- H04W52/38—TPC being performed in particular situations
- H04W52/46—TPC being performed in particular situations in multi hop networks, e.g. wireless relay networks
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- 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
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Abstract
The invention belongs to the technical field of wireless communication and discloses a D2D (Device-to-Device) communication power distribution and relay selection method based on network coding. The D2D communication power distribution and relay selection method comprises the following steps: carrying out optimal power distribution on each standby relay node; and selecting a relay node capable of enabling the capacity of a D2D link channel to be the greatest as an optimal relay node. According to the D2D communication power distribution and relay selection method, the network coding, a relay technology and D2D communication are combined, so that the frequency spectrum utilization rate of a mixed network can be realized by relatively low cost, and the network coverage and service quality problems are solved; optimal power distribution is carried out on the node on a terminal straight-through link under the condition that the total emission power of the terminal straight-through link is certain, aiming at a system scene which takes a cellular user as a bidirectional relay node, so that the optimal relay node is selected; and compared with other power distribution and relay selection algorithms, the channel capacity of the terminal straight-through link can reach the 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 technology
In order to ensure the communication quality and safety of local service, third generation partner program (thethird
Generation PartnerProject, 3GPP) terminal direct connection is communicated into (Device-to-Device, D2D) technology the bottom of as
Layer network is applied in cellular network, radio communication committee of International Telecommunication Union (International
Telecommunications Union-Radio CommunicationsSector, ITU-R) D2D is classified as into following channel radio
One of key technology of letter, with the spectrum utilization efficiency for increasing system, the load for mitigating base station, the transmitting for reducing terminal and base station
Power, lifting overall channel capacity.But become far suddenly when the channel between D2D user occurs deep fading or space length
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 relatively low cost.On the other hand, network code allows intermediate node to information
Processed, thoroughly overturned understanding of the people to interference signal all the time, it is allowed to carry out while multi-way radio communication, enter
And improve transfer rate and channel capacity.Therefore network code is applied in D2D communications, for analysis and solution hybrid network
The problems such as interference coordination in network, has critically important application value.D2D user and its related skill are introduced in former cellular network
Art, while systematic function is improved, also necessarily will cause more complicated to interfere problem.Therefore, in how reasonably inciting somebody to action
It is applied in D2D communications after technology and network code, interference is effectively managed, design practicable transmission plan, makes
It is problem demanding prompt solution that D2D communication performances are further improved.For phone user as two-way relay nodes system field
Scape, currently available technology does not have on the premise of the QoS requirement of cellular link and D2D links is considered, 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 advantages are expanded on effect ground.
The content of the invention
For the problem that prior art is present, the invention provides a kind of D2D power of communications based on network code is distributed
And relay selection method.
The present invention is achieved in that a kind of D2D power of communications distribution based on network code and relay selection method, institute
State the D2D power of communications distribution based on network code and relay selection method is realized maximizing the channel capacity of D2D communication links
Target mathematical model be：
s.t.2|hbd|2pd≤I0；
|hbk|2pk≤I0；
2pd+pk=P；
0<pd,pk<P；
Wherein, pdRepresent the transmit power of D2D user, pkRepresent the transmit power of via node, pnRepresent phone user's
Transmit power, h represents the channel information between D2D user and via node, hck、hcdRepresent phone user with relaying section respectively
Channel information between point, D2D user, hbd、hbkBase station and the channel information between D2D user, via node, P are represented respectively
Represent the total emission power of D2D user and via node, I0Represent 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 object function of the relay selection that the D2D based on network code communicates is：
Wherein corresponding k* (1≤k*≤ L) it is the optimal relay node of selection, h*,hck *,hcd *,hbd *,hbk *It is as right
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
Suddenly：
Step one, base station obtains now channel information, determines total emission power P, tolerable interference threshold value I in base station0,
Optional via node k is initialized as into 1；
Step 2, calculates s1=| hck|2pn+N0, s2=| hcd|2pn+N0,
Step 3, judges pd' value (k), ifThen select
When selecting k-th via node, the corresponding optimum transmit power of D2D user is pd *(k)=pd' (k), execution step five；Otherwise, hold
Row step 4；
Step 4, calculates respectively If Otherwise
Step 5, the p that will be obtainedd *K () substitutes into and calculates
Show that D2D is dried the maximum r of ratio to the letter at via node kd(k)；
Step 6, update k=k+1, until k be less than via node number L, perform next step, otherwise execution step two after
Continuous iteration；
Step 7, all r drawn in comparison step fived(k)(1≤k*≤ L), select wherein maximum rd(k*), its is right
The k for answering*As optimum via node, pd *K () is the optimum power value that D2D user should distribute.
Another object of the present invention is to provide it is a kind of using the D2D power of communications distribution based on network code and in
After the terminal direct connection communication system of system of selection.
Advantages of the present invention and good effect are：D2D communications, relay transmission technology and network code are combined, is designed
Complete power distribution and relay selection method, with the channel capacity that relatively low cost improves D2D communications；Use for honeycomb
Family as two-way relay nodes system scenarios, on the premise of terminal direct connection link transmissions general power is certain, to terminal direct connection
Node on link has carried out optimal power allocation, have selected optimal relay node.Compared with other technologies, what the present invention was provided
Technical scheme can make terminal direct connection link channel capacity reach maximum.
Description of the drawings
Fig. 1 is the D2D power of communications distribution based on network code provided in an embodiment of the present invention and relay selection method stream
Cheng Tu.
Fig. 2 is the power distribution and relay selection method that the D2D based on network code provided in an embodiment of the present invention communicates
Implement flow chart.
Fig. 3 is system model figure provided in an embodiment of the present invention.
Fig. 4 is the graph of a relation of D2D link channels capacity provided in an embodiment of the present invention and total emission power.
Fig. 5 is the graph of a relation of D2D link channels capacity provided in an embodiment of the present invention and optional relaying number.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that specific embodiment described herein is not used to limit only to explain the present invention
The fixed present invention.
The application principle of the present invention is explained in detail below in conjunction with the accompanying drawings.
As shown in figure 1, the distribution of D2D power of communications and relay selection side based on network code provided in an embodiment of the present invention
Method is comprised the following steps：
S101：For each alternative via node carries out optimal power allocation；
S102：The via node that can wherein make D2D link channels capacity maximum is selected as optimal relay node.
The application principle of the present invention is further described below in conjunction with the accompanying drawings.
As shown in Fig. 2 the distribution of D2D power of communications and relay selection side based on network code provided in an embodiment of the present invention
Method is the target of the channel capacity for realizing maximizing D2D communication links, provides mathematical model：
s.t.2|hbd|2pd≤I0
|hbk|2pk≤I0；
2pd+pk=P
0<pd,pk<P
Wherein, pdRepresent the transmit power of D2D user, pkRepresent the transmit power of via node, pnRepresent phone user's
Transmit power, h represents the channel information between D2D user and via node, hck、hcdRepresent phone user with relaying section respectively
Channel information between point, D2D user, hbd、hbkBase station and the channel information between D2D user, via node, P are represented respectively
Represent the total emission power of D2D user and via node, I0Represent the tolerable interference threshold value in base station, N0For noise power.
Optimal power allocation includes：
(1) object function of optimal power allocation subproblem is reduced to：
To solve above-mentioned nonlinear restriction planning problem, order：
Wherein pk=P-2pd,s1=| hck|2pn
+N0>0, s2=| hcd|2pn+N0>0。
Assume that this subchannel meets the requirement of D2D communications, i.e.,Optimal power allocation subproblem can
To be converted into：
(2) object function f (pd) first derivative, second dervative is respectively：
Therefore in pdDuring ∈ (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), orderSolving minimum point is：
Consider constraintspd≠ 0, pd≠ 0.5P, so：
If i)Then pdAcquirement optimal solution is pd *=
pd'。
Ii) ifThen pdOptimal solution is obtained in boundary value, is madeAnd make：
Work as rd 1 ≥rd 2When,Otherwise
To sum up, p is worked asd=pd *When, problem obtains optimal solution, and D2D is to obtaining maximum channel capacity at via node k：
Optimum relay selection includes：
Difference due to selecting via node, the channel coefficients between each node also differ, each via node are carried out
After optimum power distribution, the via node that D2D link channels capacity can be made maximum is selected, this node is best relay
Node.
Best relay select object function be：
Wherein corresponding k*(1≤k*≤ L) it is the optimal relay node of selection, h*,hck *,hcd *,hbd *,hbk *It is as right
The channel coefficients of optimal relay node are answered, now D2D is to obtaining maximum channel capacity at via node k*：
The distribution of D2D power of communications and relay selection method based on network code provided in an embodiment of the present invention is specifically included
Following steps：
Step one, base station obtains now channel information, determines total emission power P, tolerable interference threshold value I in base station0,
Optional via node k is initialized as into 1；
Step 2, calculates s1=| hck|2pn+N0, s2=| hcd|2pn+N0,
Step 3, judges pd' value (k), ifThen select
When selecting k-th via node, the corresponding optimum transmit power of D2D user is pd *(k)=pd' (k), execution step five；Otherwise, hold
Row step 4；
Step 4, calculates respectively If Otherwise
Step 5, the p that will be obtainedd *K () substitutes into and calculates
Show that D2D is dried the maximum r of ratio to the letter at via node kd(k)；
Step 6, update k=k+1, until k be less than via node number L, perform next step, otherwise execution step two after
Continuous iteration.
Step 7, all r drawn in comparison step fived(k)(1≤k*≤ L), select wherein maximum rd(k*), its is right
The k for answering*As optimum via node, pd *K () is the optimum power value that D2D user should distribute.
As shown in figure 3, by the central controlled single cellular system scene in base station, each node is uniformly distributed in the cell, wherein L
Individual static phone user is alternative via node.Assume that up-link is divided into multiple orthogonal sub-channels, and every sub-channels are only
A phone user being active individually is given, the uplink frequency spectrum resource per sub-channels at most can be used by a D2D
Family is to multiplexing.Assume there is no tie link between D2D user, D2D user i and D2D user j is using physical-layer network coding
Mode, is divided to two time slots to realize two-way communication by a via node, and this D2D is to being multiplexed the upper of 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 is simultaneously to via node sending signal x1And x2, honeycomb use
Family c is to base station sending signal xn, the superposed signal expression formula that k-th via node is received：
Second time slot is broadcast phase, and via node is by the signal amplification forwarding for receiving.D2D user i and j are received
Signal yi' and yj' be expressed as：
yi'=β hikyk+hcixn+n0yj'=β hjkyk+hcjxn+n0；
WhereinFor the amplification coefficient of via node.
After D2D user i and j is removed according to the self-interference that the signal message for itself sending receives it in the second time slot
Expression formula be：
yi=β h2x2+βhhckxn+βhn0+hcixn+n0 yj=β h2x1+βhhckxn+βhn0+hcjxn+n0；
Hypothesis channel is symmetric channel, and corresponding Signal to Interference plus Noise Ratio (SINR) is：
Assume that D2D user i is identical with the transmit power of j, when k-th via node is selected, corresponding D2D links
Channel capacity can be expressed as：
On the other hand, D2D can be interfered to the uplink frequency spectrum resource for being multiplexed phone user n to base station, in order to ensure honeybee
The proper communication of nest user, D2D user should be less than interference threshold value I of base station tolerance for the interference of base station0, i.e.,：
Ibn1=| hbi|2p1+|hbj|2p2≤I0 Ibn2=| hbk|2pk≤I0；
Wherein Ibn1Represent the interference that the first time slot D2D user produces to base station, Ibn2Represent the second time slot D2D user to base
Stand produce interference.
The application effect of the present invention is explained in detail with reference to emulation.
The emulation of the present invention uses Matlab7.10.0 simulation softwares, simulation parameter to arrange as follows：
Each channel coefficientsIt is separate with additive white Gaussian noise, andn0~N (0,1), honeycomb
The transmit power of user is pn=50dB, cellular network patient jamming power upper limit I from D2D links0=30dB.
All of simulation result is all experience 1*106Meansigma methodss after secondary channel realization.
The method of proposition and other three kinds of methods are carried out into simulation comparison, wherein, optimal power allocation and random relaying are selected
Select (Optimal PowerAllocation and Random Relay Selection, OPRR) method to refer to first in each
Optimal power allocation is carried out after node, a via node is then therefrom randomly selected；Random power distribution and best relay choosing
Select (Random PowerAllocation and Optimal Relay Selection, RPOR) method to refer to each relaying
Node first carries out random power distribution, and then selecting makes the maximized via node of channel capacity；Random power distribution and random
Relay selection (Random Power Allocation and Random RelaySelection, RPRR) method is referred to every
Individual via node first carries out random power distribution, then therefrom randomly selects a via node.
Fig. 4 gives change curve of the D2D link channels capacity with total emission power.Assume that via node number is L=20.
As seen from the figure, the channel capacity of the corresponding D2D links of four kinds of methods all increases with the increase of D2D link transmissions general powers
Greatly, but the corresponding D2D links maximum channel capacity of OPOR methods proposed by the present invention is apparently higher than other methods, and with chain
The increase of road total emission power, advantage becomes apparent from.For example when D2D total emission powers are 120dB, institute's extracting method pair of the present invention
The D2D link channel capacity answered is approximately 1.25 times of OPRR methods, is approximately 7.33 times of RPOR methods, is approximately RPRR methods
8.80 again.The method that this explanation present invention is carried will be substantially better than other three methods.
Fig. 5 gives change curve of the D2D link channels capacity with optional relaying number.D2D links are assumed in emulation
Total emission power is P=80dB.As seen from the figure：I) for the present invention puies forward OPOR methods and RPOR methods, due to
Increasing the number of optional via node can increase the selectivity of via node so as to improve the channel capacity of D2D links, therefore
With the increase of via node number, the D2D link maximum channel capacities corresponding to both approaches also continue to increase, but this
The performance advantage of bright institute's extracting method becomes apparent from the increase of L.Ii) for other two methods, because being random relaying choosing
Selection method, the channel capacity of its D2D link will not increase with the increase of via node number.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (3)
1. a kind of distribution of D2D power of communications and relay selection method based on network code, it is characterised in that described based on network
The D2D power of communications distribution of coding and relay selection method realize the target mathematics of the channel capacity for maximizing D2D communication links
Model is：
s.t.2|hbd|2pd≤I0；
|hbk|2pk≤I0；
2pd+pk=P；
0<pd,pk<P；
Wherein, pdRepresent the transmit power of D2D user, pkRepresent the transmit power of via node, pnRepresent the transmission of phone user
Power, h represents the channel information between D2D user and via node, hck、hcdRepresent respectively phone user and via node,
Channel information between D2D user, hbd、hbkBase station and the channel information between D2D user, via node, P tables are represented respectively
Show the total emission power of D2D user and via node, I0Represent 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 object function of the relay selection that the D2D based on network code communicates is：
Wherein corresponding k*(1≤k*≤ L) it is the optimal relay node of selection, h*,hck *,hcd *,hbd *,hbk *As correspond to most
The channel coefficients of good via node.
2. the distribution of D2D power of communications and relay selection method based on network code as claimed in claim 1, its feature exists
In the distribution of D2D power of communications and relay selection method based on network code specifically includes following steps：
Step one, base station obtains now channel information, determines total emission power P, tolerable interference threshold value I in base station0, can
Via node k is selected to be initialized as 1；
Step 2, calculates s1=| hck|2pn+N0, s2=| hcd|2pn+N0,
Step 3, judges pd' value (k), ifThen select
During k via node, the corresponding optimum transmit power of D2D user is pd *(k)=pd' (k), execution step five；Otherwise, step is performed
Rapid four；
Step 4, calculates respectively If rd 1
(k)≥rd 2(k),Otherwise
Step 5, the p that will be obtainedd *K () substitutes into and calculates
Show that D2D is dried the maximum r of ratio to the letter at via node kd(k)；
Step 6, updates k=k+1, until k is less than via node number L, performs next step, and otherwise execution step two continues to change
Generation；
Step 7, all r drawn in comparison step fived(k)(1≤k*≤ L), select wherein maximum rd(k*), its is corresponding
k*As optimum via node, pd *K () is the optimum power value that D2D user should distribute.
3. the D2D power of communications described in a kind of utilization claim 1~2 any one based on network code is distributed and relay selection
The terminal direct connection communication system of method.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108282238A (en) * | 2018-01-29 | 2018-07-13 | 厦门大学 | A kind of relay selection method and device based on network coding technique |
| CN109257145A (en) * | 2018-10-17 | 2019-01-22 | 南通大学 | D2D cooperation transmission process optimization method and apparatus towards RLNC auxiliary |
| 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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2017
- 2017-03-04 CN CN201710125373.5A patent/CN106686683B/en active Active
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| 贲佳振: "D2D***中的功率分配和中继选择算法研究", 《中国优秀硕士学位论文全文数据库信息科技辑》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108282238A (en) * | 2018-01-29 | 2018-07-13 | 厦门大学 | A kind of relay selection method and device based on network coding technique |
| CN109257145A (en) * | 2018-10-17 | 2019-01-22 | 南通大学 | D2D cooperation transmission process optimization method and apparatus towards RLNC auxiliary |
| 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 |
| CN109257145B (en) * | 2018-10-17 | 2020-10-09 | 南通大学 | RLNC (recursive least squares) -assisted D2D cooperative transmission process optimization method and device |
| 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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| CN106686683B (en) | 2019-11-15 |
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