CN104837110B - Transmission strategy implementation method based on interruption performance lifting in honeycomb D2D communication systems - Google Patents
Transmission strategy implementation method based on interruption performance lifting in honeycomb D2D communication systems Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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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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- 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
- H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
Abstract
The invention discloses the transmission strategy implementation method based on interruption performance lifting in honeycomb D2D communication systems, this method is relayed base station as the Bi-directional amplifier forwarding (AF) in D2D systems, while base station also carries out normal communication with other phone users.Concretely comprise the following steps：In first time slot, D2D user 1 sends a signal to D2D user 2 and relaying (base station) by direct link and repeated link respectively, while base station also receives the uplink signal from other phone users；In second time slot, D2D user 2 sends a signal to D2D user 1 and relaying (base station) by direct link and repeated link respectively, while base station sends downlink signal to other phone users；In the 3rd time slot, after the mixed signal amplification that relaying (base station) receives the first two time slot, two D2D users are transmitted to respectively.The present invention communicates compared to traditional D2D, while suppressing from phone user's interference, greatly improves the interruption performance of system.
Description
Technical field
The present invention relates to the transmission strategy implementation method based on interruption performance lifting in honeycomb D2D communication systems, belong to
Field of communication technology.
Background technology
With the fast development of modern communication technology, the radix of mobile subscriber is more and more huger, but frequency spectrum resource is limited
, this utilization rate to frequency spectrum resource proposes stern challenge.In order to solve the problems, such as this, the D2D based on cellular network leads to
Letter field causes more and more concerns.D2D communications based on cellular network can not only lift the utilization rate of frequency spectrum resource
And cell throughout, and the transmitting of information is realized with relatively low transmit power in shorter distance.
Although the problem of D2D communications have significant superiority, remain security and harmful interference.Cause
This, how the security performance of junction network is incorporated into the research of D2D links becomes a new probing direction.In trunk network
In network, information source can utilize a not authenticated amplification forwarding relaying to increase the security information for being transmitted directly to destination node,
In the case of decline, even if listener-in has more preferable average signal-to-noise ratio than legitimate receiver, information security still can be realized
Transmission.And Human disturbance node can be introduced in junction network, artificial interference noise fascination eavesdropping node is sent by it,
Avoid information in transmitting procedure into being ravesdropping.
For how to avoid the harmful interference under D2D communication environments, many schemes are have recently been proposed.It is such as appropriate
Ground selects cellular device and D2D users to share Radio Resources, on the premise of no reduction cellular link performance, reduces to D2D
The interference of recipient；Using the transmission power and Radio Resource of cellular network control D2D links, by suitable Power Control,
Interference is so that whole system performance boost between coordinating two service equipments；Introduced in the D2D communications based on cellular network double
To decoding and forwarding (DF) relaying, coordinate the interference of D2D and cellular link, maximization and speed using pa Toure optimization method.
But these agreements have some limitations in the lifting of disconnected performance in systems.And the present invention can solve above well
Problem.
The content of the invention
It is an object of the present invention to provide a kind of transmission strategy being applied to based on interruption performance lifting in honeycomb D2D communication systems
Implementation method, this method is by regarding base station as a Bi-directional amplifier forwarding (i.e.：AF) relay so that D2D communication users utilize
Information is intercoursed in the combination of direct link and repeated link two ways, and realizing reduces interchannel harmful interference, significantly
Improve the interruption performance of system.
The technical scheme adopted by the invention to solve the technical problem is that：For honeycomb D2D communication system scenes, the present invention
Propose and forwarded base station as the Bi-directional amplifier of D2D links (i.e.：AF) relay, it is general to realize D2D link downs under the strategy
Approximate form under the expression formula and high s/n ratio of rate closing form, under the limitation that total transmit power is fixed, constructs system
Optimal power allocation problem, optimal value is obtained using sequential quadratic programming (SQP) algorithm.
Method flow：
Step 1：D2D communication systems based on cellular network include a pair of of D2D user (i.e.：D2D user 1 and D2D user
2), Bi-directional amplifier relays (i.e.：Base station), phone user.They use D2D respectively1,D2D2, R and CU represent, D2D1,D2D2, R and
The transmit power of CU is respectively P1,P2,PR,PC。
Step 2：In the first time slot, phone user CU sends uplink signal SCTo base station；And D2D is used in D2D links
Family 1 sends signal S by repeated link1To relaying R (i.e.：Base station), while signal S is sent by direct link1To D2D user
2.At this point for D2D links, relaying R is (i.e.：Base station) and D2D user 2 all disturbed be subject to from phone user CU.
Step 3：In the second time slot, base station sends downlink signal SRGive phone user CU；And D2D is used in D2D links
Family 2 sends signal S by repeated link2To relaying R (i.e.：Base station), while signal S is sent by direct link2To D2D user
1。
Step 4：In the 3rd time slot, relaying R is (i.e.：Base station) mixed signal that the first two time slot receives is amplified,
Gain amplifier is G, and G is expressed as relaying transmit power and the arithmetic square root of mixed signal power ratio.Relay R (base station) respectively
Amplified signal is sent to D2D user 1 and D2D user 2.
Step 5：According to D2D user 1 in the second time slot and the 3rd time slot received signal, connecing for D2D user 1 can be obtained
Receive Signal to Interference plus Noise Ratio；According to D2D user 2 in the first time slot and the 3rd time slot received signal, the reception of D2D user 2 can be obtained
Signal to Interference plus Noise Ratio.
Step 6：The D2D user 1 determined according to above-mentioned steps 5 and the Signal to Interference plus Noise Ratio of D2D user 2, define in D2D links
Disconnected probability PoutFor:Pout=P [min (SINR1,SINR2)≤γth].Wherein SINR1For the Signal to Interference plus Noise Ratio of D2D user 1；SINR2
For the Signal to Interference plus Noise Ratio of D2D user 2；γthFor threshold value set in advance.
Step 7：According to the method for subregion volume integration, the outage probability P that above-mentioned steps 6 are definedoutDecomposed by integral domain
For the form of the sum of two integrations.The results added of two integrations is obtained respectively, and the interruption of the D2D transmission strategies proposed is general
Rate.Consider further that interference of the D2D user terminals from phone user CU will be far longer than the power of noise in the case of high s/n ratio, obtain
The approximate form of system break probability under high s/n ratio.
Step 8：With the minimum optimization aim of system break probability, it is proposed that optimal power allocation problem, optimization object are
D2D user couple and the transmit power P of relaying1,P2,PR, constraints P1+P2+PR=P, wherein P are fixed total transmission work(
Rate.Using sequential quadratic programming (i.e.：SQP) algorithm solves optimal power allocation scheme of the optimal value as system.
The above method of the present invention is applied in honeycomb D2D communication systems.
Beneficial effect：
1st, direct link and repeated link are combined by the present invention, are ensureing that phone user is identical with D2D users to share
Under the premise of frequency spectrum resource, reducing the harmful interference on D2D links influences, and increases the handling capacity of cell.
2nd, the present invention using base station as Bi-directional amplifier (i.e.：AF) relaying supports transmission, with traditional D2D communication strategy phases
Than interruption performance has obtained significantly being lifted.
Brief description of the drawings
Fig. 1 is the system model schematic diagram of the present invention.
Fig. 2 is flow chart of the method for the present invention.
Embodiment
Go out further detailed description to the invention with reference to Figure of description.
As shown in Figure 1, the honeycomb D2D communication systems of the present invention include a pair of of D2D user, a phone user, a work
For the base station of AF relayings, D2D is used respectively1,D2D2, CU, R are represented.Assuming that a single cell scenario, channel condition is Rayleigh fading
Channel, all nodes work in a half-duplex mode, and outfit is single antenna, uplink and downlink channel be it is reciprocal constant,
And in the case of high s/n ratio, the interference from phone user to D2D links will be far longer than noise power.
Use PiTo represent the transmit power of i-node, wherein i ∈ { 1,2, R, C }.For rayleigh fading channel, h is usedijCarry out table
Show node i to the channel coefficients between node j, wherein i, j ∈ { 1,2, R, C }, i ≠ j.Because channel is reciprocal constant, have
hij=hji.The noise n of i (i ∈ { 1,2, R, C }) nodeiIt is assumed to be additive white Gaussian noise (AWGN), there is ni~CN (0, N0)。
dijRepresent that node i the distance between to node j, is readily obtained dij=dji.α represents path fading coefficient.Come in j nodes spontaneous
The reception power for sending node i isUse SiRepresent the transmission signal from node i (i ∈ { 1,2, R, C }).
Transmission strategy provided by the invention includes three time slots, in the first slot, D2D1With transmit power P1Send at the same time
Signal S1To relaying R (base station) and D2D2, phone user CU is with transmit power PCSend signal SCTo relaying R (base station).Therefore
The relay node R (base station) and D2D of D2D links2It is subject to the interference effect from CU, the first time slot is in D2D2, relaying R (base station)
Reception signal be expressed as：
(1) represents the first time slot in three time slots in wherein above-mentioned expression formula.
In the second time slot, D2D2With transmit power P2Send signal S at the same time2To relaying R (base station) and D2D1, while base
The downlink signal for sending cellular link stand to CU.Second time slot is in D2D1It is expressed as with the reception signal of relaying R (base station)：
(2) represent the second time slot in three time slots in wherein above-mentioned expression formula.
The reception signal that R (base station) combines the first two time slot is relayed, mixed signal is amplified and same in the 3rd time slot
When be transmitted to two D2D users.It is in the mixed signal of relaying R (base station) then：
The amplification coefficient of relaying R (base station) is expressed as：
Amplification coefficient G may insure that the transmit power of relaying R (base station) is PR。
In the 3rd time slot, D2D1,D2D2The amplification forwarding signal from relaying R (base station) is received, is expressed as：
(3) represent the 3rd time slot in three time slots in wherein above-mentioned expression formula.
In formula (7), (5) are substituted into (8), after self-interference is eliminated, D2D1,D2D2The reception in the 3rd time slot is held to believe
Number it can be written as：
D2D1Signal is received in the second time slot and the 3rd time slot, D2D2Signal is received in the first time slot and the 3rd time slot,
Therefore D2D1,D2D2Reception Signal to Interference plus Noise Ratio (SINR) be respectively：
Outage probability is defined as the threshold gamma that instantaneous SINR is less than a settingth, i.e.,
Pout=P [SINR≤γth] (13)
The present invention on the basis of existing cellular network, both effectively suppresses interchannel based on traditional D2D communication theories
Harmful interference, but can significantly lifting system interruption performance, specifically show that interruption performance step includes as follows under the strategy：
1) system break probability
Two D2D communication users D2D1,D2D2Signal must all be correctly received, therefore the measurement of interruption performance must be same
When consider D2D1With D2D2End-to-end SINR.Then the outage probability of D2D links can be written as：
Pout=P [min (SINR1,SINR2)≤γth] (14)
By by formula X=P1R|h1R|2, Y=P2R|h2R|2, Z=PCR|hCR|2, W=P12|h12|2, V=P21|h21|2And T
=PC2|hC2|2Substitute into (11) and (12), two D2D users receive SINR and are reduced to respectively：
Wherein a=G2/P1, b=G2/P2。
Therefore the outage probability of D2D links is expressed as：
The expression formula that non-interrupted probability is released according to (17) is：
Wherein,
X and Y is independent exponential random variable, and therefore the integral domain in (18) formula is to obtain the pass of non-interrupted probability
Key.Simultaneous EquationsWithCalculating solves solution of equations i.e. crosspoint (X0,Y0) be：
Straight lineX passes by crosspoint (X0,Y0), integral domain is divided into two parts.Therefore according to integration
Region, non-interrupted probability expression can be expressed as the sum of two integrations：
Wherein X=P1R|h1R|2~CN (1/P1R), Y=P2R|h2R|2~CN (1/P2R)。
Integral and calculating is carried out to (21), the expression formula for releasing non-interrupted probability is：
Therefore the expression formula for obtaining D2D outage probabilities is：
Substitute into above-mentioned defined K, L, M, after N, expression formula (23) is changed into：
(24) formula is exactly the accurate expression of D2D link downs probability under the strategy.
2) under high s/n ratio outage probability approximate form
Assuming that in the case of high s/n ratio in the present invention, to be far longer than for interference of the D2D user from phone user
The power of noise, but noise cannot be ignored and be exaggerated in relaying R (base station).Therefore, according to the conclusion of formula (24), draw
The approximate expression of outage probability is during high s/n ratio:
3) optimal power allocation scheme
For transmission strategy provided by the invention, the optimization of power is carried out to D2D links using outage probability as measurement
Distribution, it is therefore an objective to reasonably distribute transmit power P by optimal power allocation scheme1,P2,PRSo that outage probability reaches minimum,
Constraints is fixed total transmit power P.
Therefore optimization problem is described as：
s.t. P1+P2+PR=P
According to the conclusion of the formula (14), above-mentioned optimization problem is converted to：
s.t. P1+P2+PR=P
Introduce auxiliary variable t and make it that problem is disposable：T=min (SINR1,SINR2), object function is changed intoCause
This optimal power allocation problem is expressed as again：
s.t. P1+P2+PR=P (28)
SINR1≥t,SINR2≥t
Above-mentioned formula (28) is a Solution of Nonlinear Optimal Problem, is solved most using sequential quadratic programming (SQP) algorithm
The figure of merit is the optimal power allocation scheme under the transmission strategy.
In conclusion the present invention is by the way of direct link and repeated link are combined, using base station as D2D links
Bi-directional amplifier forward relay so that D2D user can receive echo signal in two different time-gaps, be improved greatly
The interruption performance of system.
Claims (2)
1. the transmission strategy implementation method based on interruption performance lifting in honeycomb D2D communication systems, it is characterised in that the method
By regarding base station as a Bi-directional amplifier forward relay, comprise the following steps：
Step 1：D2D communication systems in cellular network include a pair of of D2D user, Bi-directional amplifier relaying, i.e.,：Base station, honeycomb are used
Family；They use D2D respectively1,D2D2, R and CU represent, D2D1,D2D2, the transmit power of R and CU are respectively P1,P2,PR,PC；
Step 2：In the first time slot, phone user CU sends uplink signal SCTo base station；And D2D user 1 is logical in D2D links
Cross repeated link and send signal S1Relaying R is given, i.e.,：Base station, while signal S is sent by direct link1To D2D user 2；At this time
For D2D links, R is relayed, i.e.,：Base station and D2D user 2 are disturbed be subject to from phone user CU；
Step 3：In the second time slot, base station sends downlink signal SRGive phone user CU；And D2D user 2 is logical in D2D links
Cross repeated link and send signal S2Relaying R is given, i.e.,：Base station, while signal S is sent by direct link2To D2D user 1；
Step 4：In the 3rd time slot, R is relayed, i.e.,：The mixed signal that the first two time slot receives is amplified by base station, and amplification increases
Benefit is G, and G is expressed as relaying transmit power and the arithmetic square root of mixed signal power ratio；R is relayed, i.e.,：Base station will be put respectively
Big signal is sent to D2D user 1 and D2D user 2；
Step 5：Dry make an uproar is believed in the second time slot and the 3rd time slot received signal, the reception for obtaining D2D user 1 according to D2D user 1
Than；According to D2D user 2 in the first time slot and the 3rd time slot received signal, the reception Signal to Interference plus Noise Ratio of D2D user 2 is obtained；
Step 6：The D2D user 1 determined according to above-mentioned steps 5 and the Signal to Interference plus Noise Ratio of D2D user 2, the interruption for defining D2D links are general
Rate PoutFor:Pout=P [min (SINR1,SINR2)≤γth]；Wherein SINR1For the Signal to Interference plus Noise Ratio of D2D user 1；SINR2For D2D
The Signal to Interference plus Noise Ratio of user 2；γthFor threshold value set in advance；
Step 7：According to the method for subregion volume integration, the outage probability P that above-mentioned steps 6 are definedoutTwo are decomposed into by integral domain
The form of the sum of a integration；The results added of two integrations is obtained respectively, the outage probability of the D2D transmission strategies proposed；
Consider further that interference of the D2D user terminals from phone user CU will be far longer than the power of noise in the case of high s/n ratio, obtain height
The approximate form of system break probability under signal-to-noise ratio；
Step 8：With the minimum optimization aim of system break probability, it is proposed that optimal power allocation problem, optimization object are used for D2D
Family pair and the transmit power P of relaying1,P2,PR, constraints P1+P2+PR=P, wherein P are fixed total transmit power, are utilized
Sequential quadratic programming algorithm solves optimal power allocation scheme of the optimal value as system.
2. the transmission strategy based on interruption performance lifting in a kind of honeycomb D2D communication systems according to claim 1 is realized
Method, it is characterised in that：The method is by the way of direct link and repeated link are combined, using base station as D2D chains
The Bi-directional amplifier forward relay on road so that D2D user can receive echo signal in two different time-gaps.
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| CN106413098B (en) * | 2016-06-27 | 2019-09-03 | 南京邮电大学 | A kind of resource allocation methods based on outage probability in D2D network |
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