CN107172576A - It is a kind of to strengthen the D2D communication downlink resource share methods of honeycomb software safety - Google Patents
It is a kind of to strengthen the D2D communication downlink resource share methods of honeycomb software safety Download PDFInfo
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- CN107172576A CN107172576A CN201710411528.1A CN201710411528A CN107172576A CN 107172576 A CN107172576 A CN 107172576A CN 201710411528 A CN201710411528 A CN 201710411528A CN 107172576 A CN107172576 A CN 107172576A
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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
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
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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
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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
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
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Abstract
Strengthen the D2D communication downlink resource share methods of honeycomb software safety the invention discloses a kind of, distributed by combined optimization phone user transmission power, D2D link transmission powers, honeycomb channel, in the case where ensureing phone user's secure communication restrictive condition, maximize D2D user's and speed.In the case of being given in channel distribution, optimal phone user's transmission power and D2D link transmission powers, and further provide honeycomb channel allocation algorithm；Independent power budget on each channel is optimized according to channel information, joint optimal Power Control and channel assignment scheme is obtained；This method has complexity low, and amount of calculation is small, it is easy to accomplish the advantages of.
Description
Technical field
The present invention relates to the D2D communication technical fields based on downlink cellular net, especially a kind of enhancing honeycomb software safety
D2D communication downlink resource share methods.
Background technology
D2D communications allow the close phone user's direct communication of two physical locations, without passing through base station.Thus,
Compared to traditional cellular communication, D2D can realize the higher availability of frequency spectrum and message transmission rate, lower power consumption.
Therefore, D2D communications are it has been proposed that as an important supplement of existing and following beehive network system, be mainly used in local nothing
Line is serviced
As the bottom of cellular network, D2D communications will inevitably be introduced to phone user (CU) and disturbed, and this may drop
Low cellular communication quality, hinders CU and its frequency spectrum resource of D2D link sharings.Therefore, in the urgent need to intelligent interference management scheme is come
Solve this conflict.However, from the perspective of safety of physical layer, so interference becomes beneficial, because D2D links can conduct
Friendly interference and help CU prevents from being ravesdropping.Therefore, in order to realize the target of doulbe-sides' victory, i.e., for CU safe and reliable communication and
The spectral efficient of D2D links to the Resources Sharing of CU and D2D links, it is necessary to optimize.
In condition in the present invention, we cooperate with the transmission power of optimization phone user and D2D links, and honeycomb to use
The matching of family channel and D2D links.Constrained in the secure communication QoS for meeting phone user CU, and phone user's CU and D2D chain
On the premise of the power constraint on road, maximize D2D links and speed.
The content of the invention
The technical problems to be solved by the invention are that there is provided a kind of D2D communication downlinks money for strengthening honeycomb software safety
Source sharing method, fast convergence rate, amount of calculation is small, it is easy to accomplish, as a result precision is high.
It is total in order to solve the above technical problems, the present invention provides a kind of D2D communication downlinks resource for strengthening honeycomb software safety
Method is enjoyed, is comprised the following steps：
(1) the transmission power matrix P of phone user is set0, transmission power matrixes of the D2D links d on channel c is setI=1 ..., D, sets the transmission power budget matrix of phone userAnd initial dual variable λ is set(0)=0 He
Precision ε is set1=10-6、ε2=2 × 10-6、ε3=10-8、ε4=2 × 10-8, initialization iterations t=0, s=0, k=0, m
=0；
(2) according to formula
With
UpdateWithTo obtain optimal communication speed of the jth to D2D user on cellular band i：Wherein：
In formula：aiRepresent phone user i and the normalization channel gain of base station, θijRepresent D2D link j transmitting terminals to honeycomb
User i normalization interference channel gain, rijRepresent D2D link j transmitting terminals to phone user i normalization channel gain, βij
Represent normalization interference channel gains of the phone user i to D2D links j, ξijlRepresent D2D links l on cellular band i to D2D
Link j normalization interference channel gain；Kth time iteration phone user i transmission power vector is represented,Represent D2D
Transmission power vectors of the link j on phone user's i channels；WithIt is that iteration function is constituted
Functional vector,Represent transmission power vectors of the D2D links j on phone user's i channels；For honeycomb
Signal to noise ratio of the user on cellular band i,Signal to noise ratio for jth to D2D user on cellular band i；Its
In
(3) to all i=1,2 ..., C judgeWithWhether set up：If into
It is vertical, then into step (4)；Otherwise k=k+1, return to step (2) are made；
(4) step series are setWhereinFor first value of step series；
(5) solve and updateWherein
For all phone user's minimal communications speed；
(6) judge | λ(s+1)-λ(s)|<ε2Whether set up：If so, then into step (7)；Otherwise s=s+1 is made, step is returned
Suddenly (2)；
(7) judgeWhether set up：If so, then willIt is used as current work(
Transmission power of the phone user on cellular band i after optimizing under rate budgetOutput, willUsed as the D2D after optimization
Transmission power vector of the family on cellular band iOutput, and then obtain phone user's c and D2D link d Optimum Matching
Otherwise t=t+1, return to step (2) are made；
(8) according to formula
CalculateWherein Rd(pc(pd,c),pd,c) represent D2D user d transmission rate, setting direction derivative
(9) calculate:
tm+1=[tm+τmd(tm)]T；
Wherein, τmIt is from iteration step length sequenceThe respective value of taking-up, T is constraint
T to T mapping, formula t=[z] are completed using water floodTIt is expressed as having t for all c ∈ Cc=[zi-θ]+, wherein θ is
Meet the lowest water level of constraint；
(10) judge | | tm+1-tm||<ε3Whether set up, if so, then by tmAs optimal power budget allocation solution,It is that optimal power contribution and optimum channel are matched, and then obtains communication and the speed of all D2D users, otherwise
M=m+1 is made, remaining uncorrelated parameter, return to step (2) is reinitialized.
Beneficial effects of the present invention are：(1) present invention carries algorithm in the case where there is listener-in, utilizes D2D user couple
The interference of phone user ensures phone user's secure communication；(2) present invention is characterized any between CU-D2D pairs with closed solutions
Power Control；(3) present invention obtains optimal power transmission plan using power budget allocative decision；(4) carried in the present invention
Algorithm energy combined optimization power budget, Power Control and channel distribution；(5) present invention is led to for improving the safety of phone user
Letter has remarkable result；(6) present invention has fast convergence rate, and amount of calculation is small, it is easy to accomplish, the advantages of as a result precision is high.
Brief description of the drawings
Fig. 1 is the D2D system schematics based on single channel Cellular Networks downlink of the invention.
Fig. 2 is method flow schematic diagram of the invention.
Under multichannel phone user's situations of the Fig. 3 for the present invention, phone user is that joint Power is limited, D2D user is only
The vertical signal of power limit, D2D and traffic rate and phone user QoS relations under different transmission power strategy and link policy
Figure.
Under multichannel phone user's situations of the Fig. 4 for the present invention, phone user is that joint Power is limited, D2D user is only
Vertical power limit, D2D user and traffic rate and cellular band quantitative relation are under different transmission power strategy and link policy
Schematic diagram.
Embodiment
The traffic rate optimization problem of D2D user based on Cellular Networks is that the nonlinear optimization of a complicated non-convex is asked
Topic, the phone user that the present invention is directed to is descending single channel, can be under conditions of having listener-in using this algorithm, it is ensured that honeycomb
The secure communication of user, and with rapid Optimum and the optimum transmission power of phone user can be solvedWith D2D user's
Optimum transmission powerAnd the preferred channels matching between phone user and D2D userObtained using this optimized algorithm
Transmission power ensure that phone user's secure communication rate requirement, and maximize all D2D user's traffic rate sums.Under
Face is further described with reference to accompanying drawing to the present invention.
Parameters are described as follows：
ωd,c∈ { 0,1 } represents whether phone user c is multiplexed d by D2D links；
pcRepresent transmission power of the phone user on cellular band c；
qd,cRepresent transmission power vectors of the D2D user d on cellular band c；
gcRepresent the normalization channel gain between phone user c and base station；
Represent the normalization interference channel gain on channel c between base station and listener-in；
gd,cRepresent normalization channel gains of the D2D user d between honeycomb channel c；
Represent normalization interference channel gain of the base station to D2D link d receivers on channel c；
Represent D2D link d emitters and to the normalization interference channel gain between phone user c；
Represent normalization channel gain of the D2D link d emitters to listener-in on honeycomb channel c；
RcRepresent minimum traffic rate of the phone user on cellular band c；
If cellular system has D to D2D user and C phone user, each phone user individually takes a honeycomb frequency
Band；
Fig. 1 show the D2D communication technology system schematics based on cellular system downlink, it is known that D2D links d and
Phone user c reachable safe rate is expressed as：
With
Within the system, our optimization aim for maximize it is all D2D user's and traffic rate, i.e.,：Further, since phone user has higher priority, thus honeybee compared to D2D user
Nest user has the guarantee of minimum safe traffic rate, i.e.,There is a general power limitation simultaneously in phone user
And every D2D link also has a power budget on each channel, therefore optimization problem mathematical description is：
This problem is non-convex problem.Introduce variable tcReplace Pc.Former problem is converted into following optimization problem of equal value：
The independent power limitation of each channel is optimized according to channel information.If given channel distributes ωd,c, can be in the hope of
Go out optimal power control closed solutions：
Wherein：
Optimal power control can be obtained by solving above formula, problem is converted to maximum weights matching problem in bipartite graph.
Phone user and D2D links are vertex sets, and maximum data transfer rate of the D2D links on channel is the weights on side.
Wherein
It is to be discontented with when no D2D user is multiplexed the channel
Phone user's set of sufficient secure communication.Gather for other phone users.
WithTo represent optimal solution of the former problem under current t constraints, now we can obtain hc
(tc) in tcPlace can be micro-, and derivative is：
Then H (t) directional derivative can be obtained, and then problem is solved with gradient descent method.
As shown in Fig. 2 specific optimized algorithm step is as follows：Step 1：The transmission power matrix P of phone user is set0If,
Put transmission power matrixes of the D2D links d on channel cThe transmission power budget matrix of phone user is setAnd initial dual variable λ is set(0)=0 and setting precision ε1=10-6、ε2=2 × 10-6、ε3=10-8、ε4=2 × 10-8, initialization iterations t=0, s=0, k=0, m=0；
Step 2：According to formula
With
UpdateWithTo obtain optimal communication speed of the jth to D2D user on cellular band i：Wherein：
In formula：
aiRepresent phone user i and the normalization channel gain of base station, θijRepresent D2D link j transmitting terminals to phone user
I normalization interference channel gain, rijRepresent D2D link j transmitting terminals to phone user i normalization channel gain, βijRepresent
Normalization interference channel gains of the phone user i to D2D links j, ξijlRepresent D2D links l on cellular band i to D2D chains
Road j normalization interference channel gain；Kth time iteration phone user i transmission power vector is represented,Represent D2D chains
Transmission power vectors of the road j on phone user's i channels；WithIt is what iteration function was constituted
Functional vector,Represent transmission power vectors of the D2D links j on phone user's i channels；Used for honeycomb
Signal to noise ratio of the family on cellular band i,Signal to noise ratio for jth to D2D user on cellular band i；Whereinj=1,…,D、
Step 3：To all i=1,2 ..., C, judgeWithWhether set up：If
Set up, then into step 4；Otherwise k=k+1, return to step 2 are made；
Step 4：Step series are setWhereinFor first value of step series.
Step 5：Solve and updateWherein
For all phone user's minimal communications speed；
Step 6：Judge | λ(s+1)-λ(s)|<ε2Whether set up：If so, then into step 7；Otherwise s=s+1 is made, is returned
Step 2；
Step 7：JudgeAndWhether set up：If so, then willAs current
Transmission power of the phone user on cellular band i after optimizing under power budgetOutput, willIt is used as the D2D after optimization
Transmission power vector of the user on cellular band iOutput, and then obtain phone user's c and D2D link d Optimum MatchingOtherwise t=t+1, return to step 2 are made.
Step 8：According to formula
CalculateWherein Rd(pc(pd,c),pd,c) represent D2D user d transmission rate, setting direction derivative
Step 9：Calculate:
tm+1=[tm+τmd(tm)]T；
Wherein, τmIt is from iteration step length sequenceThe respective value of taking-up, T is constraint
T to T mapping is completed using water flood.Formula t=[z]TIt is expressed as having t for all c ∈ Cc=[zi-θ]+, wherein θ is
Meet the lowest water level of constraint.
Step 10：Judge | | tm+1-tm||<ε3Whether set up, if so, then by tmAs optimal power budget allocation solution,It is that optimal power contribution and optimum channel are matched.And then obtain communication and the speed of all D2D users.Otherwise
M=m+1 is made, remaining uncorrelated parameter, return to step 2 is reinitialized.
During specific emulation, if cell radius is 500m, cellular band bandwidth 10MHz, fixed D2D transmitted from transmitter to receiver away from
From for 20m, white Gaussian noise power spectral density is -173dBm/Hz, and index channel fading index is 3.5, and base station transmitting power is pre-
Calculate as 46dBm, the budget of D2D link transmission powers is 24dBm, and phone user and D2D user are evenly distributed in honeycomb at random.
Fig. 3 illustrates phone user and meets relation between the probability of safety QoS condition and D2D number of links users, and
By optimal power transmission strategy and other several project plan comparisons.
Algorithm 1：Optimum transmission power strategy+optimal D2D links-phone user's matching strategy；
Algorithm 2：Maximum transmission power strategy+optimal D2D links-phone user's matching strategy；
Algorithm 3：Optimum transmission power strategy+random D2D links-phone user's matching strategy；
Algorithm 4：Maximum transmission power strategy+random D2D links-phone user's matching strategy；
Algorithm 5：Average emitted power policy+optimal D2D links-phone user's matching strategy
As can be seen that when D2D number of links increases, the probability that 1 time phone user of algorithm meets safety QoS condition significantly increases
Plus.Secure communications of this explanation D2D to phone user has remarkable effect.
Fig. 4 illustrates the relation of D2D user's average communication speed and D2D number of links, it can be seen that when D2D number of links
During increase, 1 time D2D user's average communication speed increase of algorithm is significantly beyond other algorithms.The D2D communications of this explanation are improved
The band efficiency of phone user.
Although the present invention is illustrated and described with regard to preferred embodiment, it is understood by those skilled in the art that
Without departing from scope defined by the claims of the present invention, variations and modifications can be carried out to the present invention.
Claims (1)
1. a kind of strengthen the D2D communication downlink resource share methods of honeycomb software safety, it is characterised in that comprises the following steps：
(1) the transmission power matrix P of phone user is set0, transmission power matrixes of the D2D links d on channel c is setI=
1 ..., D, sets the transmission power budget matrix of phone userAnd initial dual variable λ is set(0)=0 is smart with setting
Spend ε1=10-6、ε2=2 × 10-6、ε3=10-8、ε4=2 × 10-8, initialization iterations t=0, s=0, k=0, m=0；
(2) according to formula
With
UpdateWithTo obtain optimal communication speed of the jth to D2D user on cellular band i：
Wherein：
In formula：aiRepresent phone user i and the normalization channel gain of base station, θijRepresent D2D link j transmitting terminals to phone user
I normalization interference channel gain, rijRepresent D2D link j transmitting terminals to phone user i normalization channel gain, βijRepresent
Normalization interference channel gains of the phone user i to D2D links j, ξijlRepresent D2D links l on cellular band i to D2D links
J normalization interference channel gain；Kth time iteration phone user i transmission power vector is represented,Represent D2D links j
Transmission power vector on phone user's i channels；WithIt is the function that iteration function is constituted
Vector,Represent transmission power vectors of the D2D links j on phone user's i channels；Exist for phone user
Signal to noise ratio on cellular band i,Signal to noise ratio for jth to D2D user on cellular band i；Wherein
(3) to all i=1,2 ..., C judgeWithWhether set up：If so, then
Into step (4)；Otherwise k=k+1, return to step (2) are made；
(4) step series are setWhereinFor first value of step series；
(5) solve and updateWherein
For all phone user's minimal communications speed；
(6) judge | λ(s+1)-λ(s)|<ε2Whether set up：If so, then into step (7)；Otherwise s=s+1, return to step are made
(2)；
(7) judgeAndWhether set up：If so, then willIt is used as current power budget
Transmission power of the phone user on cellular band i after lower optimizationOutput, willAs the D2D user after optimization in honeybee
Transmission power vector on nest frequency band iOutput, and then obtain phone user's c and D2D link d Optimum MatchingOtherwise make
T=t+1, return to step (2)；
(8) according to formula
CalculateWherein Rd(pc(pd,c),pd,c) represent D2D user d transmission rate, setting direction derivative
(9) calculate:
tm+1=[tm+τmd(tm)]T；
Wherein, τmIt is from iteration step length sequenceThe respective value of taking-up, T is constraintUsing note
Water law completes t to T mapping, formula t=[z]TIt is expressed as having t for all c ∈ Cc=[zi-θ]+, wherein θ is to meet about
The lowest water level of beam；
(10) judge | | tm+1-tm||<ε3Whether set up, if so, then by tmAs optimal power budget allocation solution,It is that optimal power contribution and optimum channel are matched, and then obtains communication and the speed of all D2D users, otherwise
M=m+1 is made, remaining uncorrelated parameter, return to step (2) is reinitialized.
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| CN107613556A (en) * | 2017-09-19 | 2018-01-19 | 西安交通大学 | A kind of full duplex D2D interference management methods based on Power Control |
| CN108834113A (en) * | 2018-06-20 | 2018-11-16 | 江苏大学 | A kind of D2D convert communication system and its communication means towards 5G Cellular Networks safety of physical layer |
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| CN116867075A (en) * | 2023-07-25 | 2023-10-10 | 江苏大学 | Channel allocation method in cellular and D2D user clustering network |
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