CN107071914B - Dynamic mode selection and energy distributing method in a kind of energy capture D2D network - Google Patents
Dynamic mode selection and energy distributing method in a kind of energy capture D2D network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
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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
- H04W52/18—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
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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]
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
Abstract
Dynamic mode selection and energy distributing method in a kind of energy capture D2D network of the present invention, the cellular system coexisted for D2D and battery the power supply user energized by energy capture, consider time slotted transmission, with K time slot for a transmission stage, resource multiplex mode is dynamically selected for user under different channel conditions and energy state using signal-noise ratio threshold in each time slot in transmission stage, and combine the channel information building utility index currently known with the past, online energy distribution and power control are carried out according to utility index parameter, when current time slots channel utility index is greater than the average value of previous utility index, current time slots utilisable energy is completely used for current time slots data to send, otherwise it only uses the energy of half and the other half is kept for later time slot.After the energy value that current time slots use has been determined, controlled under the limitation of energy and cellular link rate with maximizing user's transmission rate and sending power to user for target.
Description
Technical field
The present invention relates to wireless communication D2D energy capture fields, the dynamic analog in specially a kind of energy capture D2D network
Formula selection and energy distributing method.
Background technique
In recent years, wireless broadband network and intelligent terminal develop rapidly, and all kinds of new business are continued to bring out with service innovation, with
And come be burgeoning energy consumption.In wireless network environment, each node energy fixed usually using battery etc.
Device is measured as energy supply source, however, to node replacement battery or being battery when the environment locating for the network node is excessively complicated
Charging has difficulties, therefore energy limit becomes the key factor for influencing wireless network life cycle and performance.In the case
It can be set by physically or chemically mode from wind energy, solar energy, the RF energy etc. in natural environment for the node of lower power consumption
Standby energy capture (Energy Harvesting, EH) technology energized starts to highlight its advantage.It at the same time, is reduction
The occupancy of interface-free resources improves system throughput, reduces communication delay, saving terminal power, and the short distance in subrange is straight
Connecting telecommunications services becomes a kind of fashion trend, and wherein equipment is a kind of allusion quotation to equipment (Device to Device, D2D) communication
The short distance direct communication mode of type.According to the short distance characteristic that D2D is communicated, then its required power is smaller, thus is caught using energy
Obtain to its mode for carrying out wireless power be it is reasonable and have practical value.
It is most important in D2D communication to study a question as resources control.Due to cellular network introduce D2D communication will bring it is logical
Believe the interference between link, therefore interference coordination is the major technical challenge faced in cellular network D2D communication, and resources control
It is then the important way for carrying out interference coordination.Resources control mainly includes three model selection, resource allocation and power control sides
Face:
1, model selection: D2D user carries out data transmission needs with legacy cellular user sharing running time-frequency resource, according to money
The shared mode in source, user can select from following two mode:
(1) orthogonal modes: D2D user carries out to using the resource orthogonal with legacy cellular user to lead directly on link in D2D
Communication.
(2) multiplexer mode: D2D user is led directly on link the resource of multiplexing legacy cellular user in D2D and is communicated,
In this case, the level of resources utilization is higher, but D2D link interferes each other with cellular link.
2, resource allocation: reasonable distribution running time-frequency resource guarantees the utilization of resources and interferes the balance of control room, realizes preferable
Performance gain.
3, power control: power adjustment is carried out according to the variation of channel circumstance, user location etc., is effectively reduced between link
Interfere with each other, lifting system performance.
Solution at present about energy capture D2D resources in network control problem is also less, mainly has
Jianfeng Ding et al. be directed to the D2D in uplink cell network based on energy capture communication, guarantee honeycomb and
The total power consumption cost that system is minimized under conditions of the QoS of D2D link carries out dynamic spectrum bandwidth allocation to user；
Zhenyu Zhou etc., will be offline as target to maximize user's efficiency in the network that multipair D2D and multiple phone users coexist
Power distribution problems are modeled as the non-cooperative game in limited range, and pass through non-linear fractional programming and Lagrange duality
Decomposition iteration solves low complex degree power distribution algorithm；ShrutiGupt etc. reaches priori in energy according to the causality of energy
Under the whether known two kinds of scenes of information, the rate progress D2D of the D2D link of phone user QoS limitation is met by maximizing
The resource coordination and power control of user and phone user, be utilized respectively traditional Lagrangian multiplier method and Dynamic Programming provide from
Line and online two kinds of combined optimization algorithms.According to investigation, there is presently no the researchs for model selection in energy capture D2D network
And discussion.
Summary of the invention
Aiming at the problems existing in the prior art, the present invention provides the dynamic mode choosing in a kind of energy capture D2D network
It selects and energy distributing method, according to different channels condition and capture energy state, it is different to be that user selects using given thresholding
Resource multiplex mode simultaneously combines known channel information structuring utility index in the past, carries out dynamic energy according to utility index parameter
Distribution and power distribution.
The present invention is to be achieved through the following technical solutions:
A kind of D2D model selection and energy distributing method based on energy capture, comprising the following steps:
Step 1, before each transmission stage starts, base station is that each D2D that connection has been established in cell is used at random
To one phone user of distribution as resource-sharing object, the D2D user couple and a phone user after pairing are shared at family
Same asset gives D2D user to the signal-noise ratio threshold value of selectionAnd will entirely transmit divided stages is K isometric
Transmission time slot, each slot length be τ；Initialize timeslot number i=0；Energy reaches original state E0=0 and D2D user
Initial transmission power P0=0；Wherein, K is positive integer；
Step 2 enables i=i+1, D2D send user and calculate the current available maximum energy value of i-th of time slotIn conjunction with
Given thresholding selects to provide used by current i-th of transmission time slot according to model selection criterion in multiplexing and orthogonal both of which
Source shared model；
Step 3 is dynamically current i-th of time slot allocation utilisable energy under selected mode, and carry out function to user
Rate control；
Step 4, user are sent using the data that power control commands obtained by step 3 carry out i-th of time slot；
Step 5 repeats step 2 to four, until i > K, i.e. K slot transmission stage terminate；Complete a D2D user
Energy distribution to D2D model selection and its all time slot based on energy capture；Step 1 is repeated to five, is followed successively by every
A D2D user distributes energy is completed.
Preferably, in the step 2, the available maximum energy value of i-th of time slotCircular it is as follows:
Wherein, i=1,2,3 ..., K, Ei(i=1,2 ..., K) indicates the energy reached when i-th of time slot starts,Power is sent for (i-1)-th time slot D2D user.
Preferably, in the step 2, the model selection criterion that a time slot of i-th (i=1,2 ..., K) sends user is as follows:
WhenWhen, select multiplexer mode；Otherwise orthogonal modes is selected；
Wherein, σ2For noise power,Indicating that i-th of time slot D2D is sent between user and correspondingly received user includes road
The channel coefficients of diameter loss and multipath fading.
Preferably, in the step 2, the given thresholding is given by the following formula,
Wherein,It is every time slot D2D user to average capture energy,Respectively D2D user
Channel coefficients mould between pair, between phone user and D2D reception user, D2D transmission user and base station and phone user and base station
Square statistical distribution average value,For the minimum transmission rate of cellular link.
Preferably, in the step 3, the specific method is as follows for dynamic power distribution:
The first step, the mean value of initialising subscriber channel coefficients mould squareFor
Store the vector of each timeslot multiplex channel effectiveness situationIt is every for storing
The vector of a time slot orthogonal channel effectiveness situationAverage multipling channel effectivenessWith average orthogonal channel effectiveness
As i=1, second step is executed；
As i ≠ 1, third step execution is jumped directly to；
Second step calculates the multipling channel effectiveness of first time slotWith orthogonal channel effectivenessAnd save, if first time slot D2D user couple and phone user select multiplexer mode, when distributing to first
The utilisable energy of gapFor
If first time slot user selects orthogonal modes, the utilisable energy of first time slot is distributed toFor
Third step calculates i-th (i=2,3 ... K) a timeslot multiplex channel effectivenessAnd orthogonal channel
EffectivenessAnd save, if i-th of time slot D2D user couple and phone user select multiplexer mode, when distributing to i-th
The utilisable energy of gapFor
WhereinThe average value of i-1 timeslot multiplex channel effectiveness before indicating；
If i-th of time slot user selects orthogonal modes, the utilisable energy of i-th of time slot is distributed toFor
WhereinThe average value of i-1 time slot orthogonal channel effectiveness before indicating.
Preferably, in the step 3, the specific method is as follows for user power control:
The user power control problem description are as follows:
0≤αi≤1 (11)
Wherein,WithIndicate phone user and D2D user to the transmission rate in i-th of time slot,WithFor bee
Nest user and D2D send user in the transmission power of i-th of time slot,For the minimum transmission rate of cellular link,For bee
Nest user's maximum sends power, αiResource allocation ratio when for i-th of Slot selection orthogonal modes；Formula (8) indicates honeycomb chain
Road need to meet minimum transmission rate request in transmission rate, and formula (9) and (10) respectively indicate the hair of phone user and D2D user couple
Send power limitation condition；
When D2D user couple and phone user select orthogonal modes, user sends power and resource allocation ratio is,
When D2D user couple and phone user select multiplexer mode, user sends power and provides according to following situation；
I. whenWhen, definition is at this time at two non-zero boundary points of feasible zone range
User's transmission rate and be respectively,
Then user's transmission power is
Ii. whenWhen, define three non-zero boundary points of feasible zone range at this time
User's transmission rate at place and be respectively
With
Then user's transmission power is
Preferably, the honeycomb that the D2D and battery power supply user that the method is used to be energized using energy capture coexist
System；Base station is distributed mutually orthogonal subchannel for each phone user in cell and is carried out data transmission in the system, D2D
User then by with phone user share its uplink resource realization communicate, a pair of of D2D user to be merely able to sharing one bee
The resource of nest user, while the resource of a phone user is also merely able to by a pair of of D2D user to multiplexing.
Further, the energy capture is that solar energy, wind energy, thermoelectric energy, mechanical movement energy are captured from environment
And electromagnetic radiation energy.
Preferably, the phone user includes the mobile phone terminal in cellular network, and the tool communicated with base station
There are other communication terminals of phone user's authorized spectrum band access right；D2D user includes the mobile phone terminal in cellular network, and
Other communication terminals in Internet of Things and/or sensor network communicated dependent on cellular network frequency range.
Compared with prior art, the invention has the following beneficial technical effects:
The present invention provides the sides of the selection of user resources shared model and energy distribution in a kind of D2D network of energy capture
Method utilizes signal-to-noise ratio in the case that energy at the i.e. current time for only knowing cause and effect and before is reached with channel state information
Thresholding is dynamically selected resource multiplex mode under different channel conditions and energy state for user, and combines currently and mistake
It goes the channel information known to construct utility index, online energy distribution and power control is carried out according to utility index parameter.
The present invention combines the influence for considering energy fluctuation and channel variation for user's transmission rate, the state in conjunction with known to the past
Information preferentially chooses sending strategy, and the dynamic for preferably realizing energy uses, lifting system performance.
Detailed description of the invention
Fig. 1 is the system model figure of energy capture D2D network described in present example.
Fig. 2 is network link illustraton of model described in present example.
Fig. 3 is that phone user position is fixed, as D2D user is to scheme and single mode described in mobile lower present example
And maximize the contrast curve chart of current time slots rate option.
Fig. 4 is that phone user and D2D user are fixed to position, and between D2D user couple, distance changes present example
Described in scheme and single mode and maximize the contrast curve chart of current time slots rate option.
Fig. 5 is the flow chart of method described in present example.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
The present invention is directed to the honeycomb system that the D2D energized by energy capture and traditional battery power supply user coexist
System, the method for proposing a kind of dynamic selection of user resources multiplexer mode and energy distribution.This method is existed using signal-noise ratio threshold
It is dynamically selected resource multiplex mode for user under different channel conditions and energy state, and combines and had currently been obtained with the past
The channel information building utility index known carries out online energy distribution and power control according to utility index parameter.The present invention
Described in phone user be not only limited to the mobile phone terminal in cellular network, further include communicated with base station have honeycomb
Other communication terminals of user's authorized spectrum band access right, and D2D user then include mobile phone terminal in cellular network and according to
Rely other communication terminals in Internet of Things that cellular network frequency range is communicated, sensor network.
The network for single cell that a phone user and D2D user coexist is considered in the present invention, as shown in Figure 1, base station position
In center of housing estate, multiple phone users are evenly distributed in cell at random, and D2D user is then random in a pair wise manner uniformly to be existed
In cell.It assumes base stations as each phone user in cell and distributes mutually orthogonal subchannel carrying out data transmission, and D2D
User by sharing the realization of its uplink resource with phone user to then being communicated, it is assumed that a D2D user is to being merely able to share
The resource of one phone user, while the resource of a phone user is also merely able to by a D2D user to multiplexing, i.e., each bee
Transmission process between nest user and base station is independent from each other, and the transmission between each D2D user couple is independent from each other.Thus, it does
It disturbs and exists only between the phone user and D2D user couple of multiplexing same asset, and there is no interference, each D2D between each cellular link
Also there is no interference between link.Because not interfering with each other between D2D pairs, power distribution model simplification is to examine by this patent
Consider and a D2D user of shared same asset is needed to carry out between a phone user, is carried out one by one in multiple D2D clock synchronizations
The energy allocation plan that this patent is proposed.System link is as shown in Figure 2.In addition, D2D user utilizes energy capture technology from ring
Solar energy, wind energy, thermoelectric energy, mechanical movement energy and electromagnetic radiation energy etc. are captured in border and supports data transmission, and D2D is used
Family itself has certain power supply capacity to guarantee basic circuit consumption, but this portion of energy is not used in data and transmits, and honeycomb
User is then powered by battery.
Consider time slotted transmission mode, when each time slot a length of τ, defining every K time slot is a transmission stage, is considered
Resources control problem in the transmission stage.
As shown in figure 5, the present invention provides the dynamic modes in a kind of energy capture D2D network to select and energy distribution side
Method, comprising the following steps:
Step 1, before each transmission stage starts, base station is that each D2D that connection has been established in cell is used at random
Family distributes a phone user (CUE) to (DUE) and is used as resource-sharing object, and the D2D user couple and phone user after pairing are total
Same asset is enjoyed, gives D2D user to the signal-noise ratio threshold value of model selectionAnd will entirely transmit divided stages is K
A isometric transmission time slot, each slot length are τ.Initialize timeslot number i=0；Energy reaches original state E0=0 and
D2D sends user's initial transmission power P0=0；Wherein, K is positive integer；
Step 2 enables i=i+1, D2D send user and calculate the current available maximum energy value of i-th of time slotIn conjunction with
Given thresholding selects to provide used by current i-th of transmission time slot according to model selection criterion in multiplexing and orthogonal both of which
Source shared model；
The available maximum energy value of i-th of time slotCircular it is as follows:
Wherein, i=1,2,3 ..., K, Ei(i=1,2 ..., K) indicates the energy reached when i-th of time slot starts,User, which is sent, for (i-1)-th time slot D2D sends power.
According toCurrent the is selected according to model selection criterion in multiplexing and orthogonal both of which in conjunction with given thresholding
Model of document resource sharing used by i transmission time slot.Due to the presence of multiplexer mode interference, to guarantee D2D link transmission performance,
Consider when maximum signal to noise ratio achieved by D2D sends user's current time slots is greater than given thresholding, just permission D2D user is to adopting
With multiplexer mode and phone user's shared resource, otherwise D2D user will be to will use orthogonal model of document resource sharing and phone user
Shared link resource.
It is considered according to above-mentioned, the model selection criterion that a time slot of i-th (i=1,2 ..., K) sends user is as follows:
WhenWhen, select multiplexer mode；Otherwise orthogonal modes is selected.
Wherein, σ2For noise power,Indicating that i-th of time slot D2D is sent between user and correspondingly received user includes road
The channel coefficients of diameter loss and multipath fading.The model selection thresholding passes through in practiceIt provides, which is to meet phone user to transmit speed
The average Signal to Interference plus Noise Ratio of D2D user couple under rate requirement condition, whereinIt is every time slot D2D user to average capture energy,Respectively between D2D user couple, phone user and D2D receive user, D2D sends user and base station
And the statistical distribution average value of the channel coefficients mould square between phone user and base station,For the minimum transmission speed of cellular link
Rate.
According to model selection criterion, user is represented by the transmission rate of i-th of time slot
Wherein,WithIndicate phone user and D2D user to the transmission rate in i-th of time slot,WithFor bee
Nest user and D2D send user in the transmission power of i-th of time slot, and αiResource when for i-th of Slot selection orthogonal modes
Allocation proportion,WithIt respectively indicates phone user and D2D receives user, D2D sends user and base station and honeycomb
Channel coefficients between user and base station.
Step 3 is dynamically current i-th of time slot allocation utilisable energy under selected mode, and carry out function to user
Rate control.Due to the randomness of channel, in order to enable the transmission rate of entire K time slot phone user and D2D user couple and using up
It is possible big, in the limited situation of gross energy, the biggish energy of the preferable time slot allocation of channel should be given, and it is poor in channel
Time slot divides a little energy less.But due to energy arrival and the causality of channel information, we can not predict following state easily,
Thus consider the reference distributed using past status information as current time slots energy.Phone user is by electricity in the present system
Pond power supply and D2D user is energized by energy capture to being, thus the energy of different time-gap is distributed primarily directed to D2D user couple
For, according to formula (2) and formula (3) it is found that working asLarger,When smaller, it should be more points of some energy of current time slots
To increase available signal power, and work asWhen larger, then need to divide some energy less to reduce interference.Thus define channel
EffectivenessAnd the dynamic allocation of energy are carried out in this, as index.Institute before the channel effectiveness of current time slots is greater than
When having the average value of non-slotted channel effectiveness, it is believed that current time slots state is preferable, can more points of a little energy, otherwise it is assumed that current time slots
Out of order, it needs to divide a little energy less.
Based on above-mentioned starting point, the specific method is as follows for dynamic power distribution:
The first step initializes the mean value of average user channel coefficients mould square
For storing the vector of each timeslot multiplex channel effectiveness situationFor depositing
Store up the vector of each time slot orthogonal channel effectiveness situationAverage multipling channel effectivenessWith average orthogonal channel effectiveness
As i=1, second step is executed；
As i ≠ 1, third step execution is jumped directly to；
Second step calculates the multipling channel effectiveness of first time slotWith orthogonal channel effectivenessAnd save, if first time slot D2D user couple and phone user select multiplexer mode, distribute to first time slot
Utilisable energyFor
If first time slot user selects orthogonal modes, the utilisable energy of first time slot is distributed toFor
Third step calculates i-th (i=2,3 ... K) a timeslot multiplex channel effectivenessAnd orthogonal channel
EffectivenessAnd save, if i-th of time slot D2D user couple and phone user select multiplexer mode, distribute to i-th
The utilisable energy of time slotFor
WhereinThe average value of i-1 timeslot multiplex channel effectiveness before indicating.
If i-th of time slot user selects orthogonal modes, the utilisable energy of i-th of time slot is distributed toFor
WhereinThe average value of i-1 time slot orthogonal channel effectiveness before indicating.
After determining current time slots utilisable energy, due to the introducing of D2D user couple, cellular link transmission is affected, and
In order to guarantee the minimum transmission rate request of cellular link, at the same maximize D2D user couple and phone user transmission rate and,
It also needs to carry out power control to user, the user power control problem can be described as:
0≤αi≤1 (11)
Wherein,For the minimum transmission rate of cellular link,Power is sent for phone user's maximum.Formula (8) indicates
Cellular link need to meet minimum transmission rate request in transmission rate, and formula (9) and (10) respectively indicate phone user and D2D is sent
The transmission power limitation condition of user.
When D2D user couple and phone user select orthogonal modes, according to user's transmission rate expression formula (2) and (3) problem
P1 can be converted into
S.t. (8), (9), (10), (11)
Due in P2 objective function forWithFor be monotonic increasing function, thus can be easy to acquire P2's
User sends power under optimal solution, that is, orthogonal modes and resource allocation ratio is as follows:
When D2D user couple and phone user select multiplexer mode, then problem P1 can be converted into
S.t. (8), (9), (10)
Using derivation analysis it is found that the optimal solution of P3 problem is necessarily present on the boundary point of feasible zone range, then can divide
Several situations acquire the optimal solution of P3 below:
I. whenWhen, definition is at this time at two non-zero boundary points of feasible zone range
User's transmission rate and be respectively,
Then user's transmission power is under optimal solution, that is, multiplexer mode of P3
Ii. whenWhen, define three non-zero boundary points of feasible zone range at this time
User's transmission rate at place and be respectively,
With
Then user's transmission power is under optimal solution, that is, multiplexer mode of P3
Step 4, user are sent using the data that power control commands obtained by step 3 carry out i-th of time slot；
Step 5 repeats step 2 to four, until i > K, i.e. K slot transmission stage terminate；It completes to be based on energy capture
D2D model selection and all time slots energy distribution.
In order to verify performance of the invention, we compare the present invention with other two scheme；Scheme 1): user adopts
With heretofore described dynamic power allocation plan but without model selection, only with single resource in K time slot
Multiplexer mode (multiplexing or orthogonal) carries out data transmission；Scheme 2): user carries out model selection according to the method in the present invention, but
For each time slot energy without dynamically distributing, but current time slots use all utilisable energies as far as possible, currently most
Available energy limitation is lower by maximizing current time slots user transmission rate and carrying out user power control.
Simulated conditions be provided that radius of society be 500m, system bandwidth 5MHz, Carrier To Noise Power Density -174dBm/Hz,
Phone user's maximum send power be 23dBm, multipath fading Rayleigh distributed, D2D link path loss be 148+40 ×
log10(L (km)), cellular link path loss are 128.1+37.6 × log10(L (km)), energy arrival process are a size
It is evenly distributed on the process reached between [0,200] mJ with the Poisson distribution arrival time of λ=100mJ/s, transmission time slot number K=
10, cellular link minimum transmission rate
Fig. 3 give when phone user be located at away from the base station position 150m at, and D2D user to keep pair between distance be 25m
When being moved along phone user and base station line, variation of the system transfer rate with D2D user to position under different schemes
Curve.As seen from the figure, the present invention program performance is better than comparison scheme.As D2D user is in place to continuous close phone user institute
It sets and when base station location, can decline only with multiplexer mode system performance, orthogonal modes is then because there is no the phases between user
Mutually interference, changes because of the change without benefiting from family relative position, in D2D user to achieved by both of which in moving process
Performance have intersection, and the present invention program can be transmitted according to the preferable mode of state dynamic select of energy and channel,
To realize the promotion of performance.And compared to the power control scheme for maximizing current time slots rate, the present invention program is according to mistake
The status information gone preferably realizes the distribution of the dynamic power between time slot, the energy more than the preferable time slot allocation of channel and give
The poor time slot of channel divides less, to improve system performance.
Fig. 4 gives phone user and is located at away from the base station position 150m, and D2D sends user and is located at phone user and base station
On the extended line of line away from base station 250m at, under different schemes system transfer rate with distance between D2D user couple change curve.
As seen from the figure, this programme performance is better than comparison scheme, and as the distance between D2D user couple increases, path loss between D2D user
Increase, thus the transmission rate of system reduces under four kinds of schemes.
Simulation result can be shown that the obtained system transfer rate of this method can realize preferable property in varied situations
Can, and applicability is had more than single mode scheme, than under the same conditions using the scheme institute energy for maximizing current time slots rate sum
The transmission rate of realization is big, thus scheme has better performance.
Claims (4)
1. a kind of D2D model selection and energy distributing method based on energy capture, which comprises the following steps:
Step 1, before each transmission stage starts, base station is each D2D user couple that connection has been established in cell at random
A phone user is distributed as resource-sharing object, a D2D user couple after pairing shares identical with a phone user
Resource gives D2D user to the signal-noise ratio threshold value of selectionAnd by the entire divided stages that transmit for K isometric biographies
Defeated time slot, each slot length are τ；Initialize timeslot number i=0；Energy reaches original state E0=0 and D2D user it is initial
Send power P0=0；Wherein, K is positive integer；
Step 2 enables i=i+1, D2D send user and calculate the current available maximum energy value of i-th of time slotIn conjunction with given
Thresholding selects resource used by current i-th of transmission time slot total according to model selection criterion in multiplexing and orthogonal both of which
Enjoy mode；
Step 3 is dynamically current i-th of time slot allocation utilisable energy under selected mode, and carry out power control to user
System；
Step 4, user are sent using the data that power control commands obtained by step 3 carry out i-th of time slot；
Step 5 repeats step 2 to four, until i > K, i.e. K slot transmission stage terminate；A D2D user is completed to base
It is distributed in the energy of the D2D model selection of energy capture and its all time slot；Step 1 is repeated to five, is followed successively by each D2D
User distributes energy is completed；
In the step 2, the available maximum energy value of i-th of time slotCircular it is as follows:
Wherein, i=1,2,3 ..., K, Ei(i=1,2 ..., K) indicates the energy reached when i-th of time slot starts,Power is sent for (i-1)-th time slot D2D user；
In the step 2, the model selection criterion that a time slot of i-th (i=1,2 ..., K) sends user is as follows:
WhenWhen, select multiplexer mode；Otherwise orthogonal modes is selected；
Wherein, σ2For noise power,Indicating that i-th of time slot D2D is sent between user and correspondingly received user includes path loss
With the channel coefficients of multipath fading；
In the step 2, the given thresholding is given by the following formula,
Wherein,It is every time slot D2D user to average capture energy,Respectively between D2D user couple,
Phone user and D2D receive user, D2D sends the channel coefficients mould square between user and base station and phone user and base station
Statistical distribution average value,For the minimum transmission rate of cellular link；
In the step 3, the specific method is as follows for dynamic power distribution:
The first step, the mean value of initialising subscriber channel coefficients mould squareIt is every for storing
The vector of a timeslot multiplex channel effectiveness situationFor storing each time slot
The vector of orthogonal channel effectiveness situationAverage multipling channel effectivenessWith average orthogonal channel effectiveness
As i=1, second step is executed；
As i ≠ 1, third step execution is jumped directly to；
Second step calculates the multipling channel effectiveness of first time slotWith orthogonal channel effectiveness
And save, if first time slot D2D user couple and phone user select multiplexer mode, distribute to the available energy of first time slot
AmountFor
If first time slot user selects orthogonal modes, the utilisable energy of first time slot is distributed toFor
Third step calculates i-th (i=2,3 ... K) a timeslot multiplex channel effectivenessWith orthogonal channel effectivenessAnd save, if i-th of time slot D2D user couple and phone user select multiplexer mode, distribute to i-th of time slot
Utilisable energyFor
WhereinThe average value of i-1 timeslot multiplex channel effectiveness before indicating；
If i-th of time slot user selects orthogonal modes, the utilisable energy of i-th of time slot is distributed toFor
WhereinThe average value of i-1 time slot orthogonal channel effectiveness before indicating；
In the step 3, the specific method is as follows for user power control:
The user power control problem description are as follows:
P1:
0≤αi≤1 (11)
Wherein,WithIndicate phone user and D2D user to the transmission rate in i-th of time slot,WithFor phone user
With D2D send user i-th of time slot transmission power,For the minimum transmission rate of cellular link,For phone user
Maximum sends power, αiResource allocation ratio when for i-th of Slot selection orthogonal modes；Formula (8) indicates that cellular link is passing
Defeated rate need to meet minimum transmission rate request, and formula (9) and (10) respectively indicate the transmission power of phone user and D2D user couple
Restrictive condition；
When D2D user couple and phone user select orthogonal modes, user sends power and resource allocation ratio is,
When D2D user couple and phone user select multiplexer mode, user sends power and provides according to following situation；
I. whenWhen, define the use at two non-zero boundary points of feasible zone range at this time
Family transmission rate and be respectively,
Then user's transmission power is
Ii. whenWhen, define the use at three non-zero boundary points of feasible zone range at this time
Family transmission rate and be respectively
With
Then user's transmission power is
2. a kind of D2D model selection and energy distributing method, feature based on energy capture according to claim 1 exists
In the cellular system that D2D and battery the power supply user that the method is used to be energized using energy capture coexist；The system
Middle base station is that each phone user in cell distributes mutually orthogonal subchannel and carries out data transmission, D2D user then by with
Phone user share its uplink resource realize communication, a pair of of D2D user to be merely able to share a phone user resource,
The resource of a phone user is also merely able to by a pair of of D2D user to multiplexing simultaneously.
3. a kind of D2D model selection and energy distributing method, feature based on energy capture according to claim 2 exists
In the energy capture is to capture solar energy, wind energy, thermoelectric energy, mechanical movement energy and electromagnetic radiation from environment
Energy.
4. a kind of D2D model selection and energy distributing method, feature based on energy capture according to claim 1 exists
In the phone user includes the mobile phone terminal in cellular network, and what is communicated with base station award with phone user
Weigh other communication terminals of frequency range access right；D2D user includes the mobile phone terminal in cellular network, and depends on Cellular Networks
Other communication terminals in Internet of Things and/or sensor network that network frequency range is communicated.
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| CN108377481B (en) * | 2018-02-02 | 2019-12-10 | 东南大学 | energy and rate sensing D2D communication spectrum resource allocation method |
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| CN109348454B (en) * | 2018-10-15 | 2021-10-15 | 北京中科晶上科技股份有限公司 | D2D cache communication content sharing method |
| CN109831760B (en) * | 2019-03-24 | 2021-02-09 | 中南林业科技大学 | High-throughput resource allocation method in energy acquisition D2D heterogeneous network |
| CN110166987B (en) * | 2019-04-29 | 2021-11-30 | 东南大学 | D2D communication energy efficiency optimization method for guaranteeing QoS of cellular mobile communication system |
| CN111669768B (en) * | 2020-06-05 | 2022-08-26 | 中通服咨询设计研究院有限公司 | Wireless energy supply cellular Internet of things resource optimization method based on full-duplex self-return |
| CN111741450A (en) * | 2020-06-18 | 2020-10-02 | 中国电子科技集团公司第三十六研究所 | Network flow prediction method and device and electronic equipment |
| CN112040454A (en) * | 2020-08-03 | 2020-12-04 | 广东以诺通讯有限公司 | Dynamic selection method of D2D wireless resource sharing mode |
| CN113473422B (en) * | 2021-07-21 | 2022-06-21 | 深圳市领创星通科技有限公司 | B5G-oriented wireless energy-carrying D2D network efficient resource allocation method |
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