CN104270798A - Distributed relay selection method suitable for simultaneous information and power transfer relay network - Google Patents

Distributed relay selection method suitable for simultaneous information and power transfer relay network Download PDF

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CN104270798A
CN104270798A CN201410490976.1A CN201410490976A CN104270798A CN 104270798 A CN104270798 A CN 104270798A CN 201410490976 A CN201410490976 A CN 201410490976A CN 104270798 A CN104270798 A CN 104270798A
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node
via node
time
relay
relay selection
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CN104270798B (en
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张超
闫静
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Dongkai Shuke (Shandong) Industrial Park Co.,Ltd.
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Xian Jiaotong University
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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
    • H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a distributed relay selection method suitable for a simultaneous information and power transfer relay network. The method is based on a relay selection strategy with maximum collection energy as the purpose and a relay selection strategy with the maximum signal to noise ratio as the purpose. A source node selects one of N relay nodes as the relay node participating in cooperative transfer. The relay selection process includes the steps that each relay node estimates channel state information of a forward link and a backward link of the relay node through communication between the relay node and the source node and between the relay node and a target node, then, the competition time of each relay node is calculated according to the estimated channel information and a pre-defined competition time function, the relay node with the shortest competition time in each time slot is selected as a cooperative node, and the performance of a system can be effectively improved through the distributed relay selection method.

Description

A kind of distributed relay selection method being applicable to letter energy simultaneous interpretation junction network
Technical field
The present invention relates to the single relay cooperative transmission technology in mobile communication technology field, in particular to two kinds of distributed relay selection methods in letter energy simultaneous interpretation (simultaneous wireless information and power transfer, SWIPT) network.
Background technology
Relay cooperative communication is a kind of available strategy utilizing the available spatial diversity between distributed single antenna terminal (spatial diversity).Due to the NATURAL DISTRIBUTION characteristic of via node in wireless relay network, in resource-constrained or large-scale junction network, multiple via node is difficult to signal is transmitted to destination node simultaneously.So various single relay selection method is carried out for improving the performance of system.
At the wireless relay network of energy constraint, such as, in wireless sensor network, node is furnished with fixing power supply usually, such as, and battery.So, charging or changing in the scene of battery inconvenience, the life time of junction network will be restricted.From natural environment, as the harvest energy such as solar energy, wind energy provides new energy supply mode to junction network.Except the energy that these are conventional, from radiofrequency signal, harvest energy has attracted increasing attention, because the amount collected is easy to control.Can the concept of simultaneous interpretation communication based on letter, transmit while information and energy and be suggested.Then, two kinds of practical receiver structures are designed out, to be called time-switching (TS) structure and power division (PS) structure respectively.Letter simultaneous interpretation communication can naturally be applied to junction network, and in junction network, via node harvest energy from the radiofrequency signal of source node also uses the energy collected that the information of source node is transmitted to destination node.So, the via node that selection one is suitable is very important for the performance of raising system.But for the junction network of energy constraint, most research all concentrates on the situation of via node harvest energy, up to the present, is not also the relay selection agreement that relaying designs from the junction network of the radiofrequency signal harvest energy of source node specially.
Summary of the invention
The object of the present invention is to provide a kind of distributed relay selection method being applicable to letter energy simultaneous interpretation junction network, a best collaboration relay node can be selected from multiple via node.
For achieving the above object, present invention employs following technical scheme:
Each via node is by the channel condition information of the communicate forward link of estimating self respectively and the backward link with source node and destination node, then each via node according to the good competition function of time of the channel condition information estimated and predefined (with relay selection strategy about) calculate self competition time, the via node competing shortest time in each time slot can be chosen as cooperative node, the information of source node is transmitted to destination node through cooperative node, the described competition function of time is based on the maximum relay selection construction of strategy of harvest energy or the relay selection construction of strategy based on maximum signal to noise ratio.
In the letter energy simultaneous interpretation junction network comprising source node, destination node and multiple via node, utilize relay selection policy selection via node as the cooperative node participating in cooperation transmission, the information of source node is transmitted to destination node through cooperative node, and idiographic flow comprises:
1) via node estimates the channel condition information of described forward link and backward link;
2) via node is according to the channel condition information estimated and the competition time calculating self based on the competition function of time of the relay selection construction of strategy of correspondence, and using the competition time as self timer initial time;
3) via node with minimum timing device initial time takes the lead in returning 0 and broadcasting a claim data bag due to its timer, the via node with minimum timing device initial time utilizes described claim data bag to notify, and other via nodes and source node oneself are cooperative node, after other via nodes receive claim data bag, timer all makes zero, and keeps dormancy in subsequent data transmission process.
When employing is transmitted based on the relay selection strategy that harvest energy is maximum, the described calculating of timer initial time and the determination of cooperative node specifically comprise the following steps:
2.1) each via node estimates the channel condition information of described forward link simultaneously;
2.2) via node is according to the channel condition information of the forward link estimated, calculates the energy that themselves capture arrives:
E k＝ξP S|h k| 2αT
Wherein, E kfor the energy that a kth via node is collected, h kfor the channel condition information of the forward link of a kth via node, P sfor source node sends the power of information, α is the time ratio of via node for collection of energy, and ξ is the conversion efficiency of energy collection circuit, and T is the time span of a time slot;
2.3) for based on the maximum relay selection strategy of harvest energy, kth self timer initial time τ of via node setting kfor 1/E k, timer takes the lead in returning relay node broadcasts claim data bag of 0, timer take the lead in returning the via node of 0 to utilize described claim data bag to notify other via nodes and source node oneself are cooperative node.
When adopt transmit based on the relay selection strategy of maximum signal to noise ratio time, the described calculating of timer initial time and the determination of cooperative node specifically comprise the following steps:
3.1) each via node estimates the channel condition information of described forward link and backward link simultaneously;
3.2) noise power introduced according to the channel condition information estimated and via node place and destination node place of via node with calculate the signal to noise ratio at destination node place:
γ D k = 2 ξ P S 2 | h k | 4 | g k | 2 α 2 ξα P S | h k | 2 | g k | 2 σ r 2 + σ d 2 ( 1 - α ) ( P S | h k | 2 + σ r 2 )
Wherein, for the signal to noise ratio at destination node place when a kth via node participates in cooperating, h kfor the channel condition information of the forward link of a kth via node, g kfor the channel condition information of the backward link of a kth via node, P sfor source node sends the power of information, α is the time ratio of via node for collection of energy, and ξ is the conversion efficiency of energy collection circuit;
3.3) for the relay selection strategy based on maximum signal to noise ratio, kth self timer initial time τ of via node setting kfor timer takes the lead in returning relay node broadcasts claim data bag of 0, timer take the lead in returning the via node of 0 to utilize described claim data bag to notify other via nodes and source node oneself are cooperative node.
When the timer of two or more via node returns 0 simultaneously, described two or more via node all broadcasts a claim data bag, the claim data bag of these relay node broadcasts is caused to collide, source node can not distinguish the information of each via node, in this case, described two or more via node again broadcasts a claim data bag in current time slots after random back a period of time, the via node taking the lead in broadcasting claim data bag is cooperative node.
Compared with prior art, beneficial effect of the present invention is:
The invention provides two kinds of distributed relay selection methods that can be used in letter energy simultaneous interpretation junction network, by calculating the competition time of each via node based on corresponding relay selection strategy, select under corresponding strategy, to have more competitive via node as cooperative node, effectively can improve the performance of system.If via node knows the channel information of forward link and backward link, the relay selection strategy so based on maximum signal to noise ratio can obtain best systematic function.In order to reduce the computation complexity of via node and obtain backward link channel information time used, network can adopt and obtain the compromise of operating cost and performance based on the relay selection strategy that harvest energy is maximum.
Accompanying drawing explanation
Fig. 1 is the application scenarios schematic diagram of distributed relay selection method example of the present invention.
Fig. 2 is the distributed relay selection protocol of letter energy simultaneous interpretation junction network in the present invention.
Fig. 3 is the flow chart of relay selection method in the present invention.
Fig. 4 is the system break probability comparison diagram that the simulation result of single junction network in the present invention compares acquisition.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
The application scenarios being applicable to the distributed relay selection method of letter energy simultaneous interpretation junction network of the present invention as shown in Figure 1, wherein S is source node, node for the purpose of D, and R is via node, after relay selection, between selected via node and destination node, there is a link.Information is transmitted to destination node by selected via node by source node.
See Fig. 3, The present invention gives the distributed relay selection method being applicable to letter energy simultaneous interpretation junction network.Each via node is by the channel condition information of the communicate forward link of estimating self respectively and the backward link with source node and destination node, then each via node according to the good competition function of time of the channel condition information estimated and predefined (with relay selection strategy about) calculate self competition time, the via node competing shortest time in each time slot can be chosen as cooperative node, the information of source node is transmitted to destination node through cooperative node, the described competition function of time is based on the maximum relay selection construction of strategy of harvest energy or the relay selection construction of strategy based on maximum signal to noise ratio.
Below by a concrete example, method of the present invention is described, supposes that network comprises a source node S, a destination node D, and N number of via node R, whole selection course in accordance with the following steps:
1) each via node is by estimating the channel condition information of forward link and backward link with source node respectively with communicating of destination node.The process of channel estimating is as follows:
1.1, as shown in Figure 2, the transmitting procedure of each frame data can be divided into 4 stages, and in first stage, first source node sends RTS packet to all via nodes and destination node, and via node like this can estimate the channel status h of its forward link k, k=1 ~ N;
1.2, destination node sends CTS packet to all via nodes and source node after receiving RTS packet, and utilize the packet received, via node can estimate the channel status g of its backward link k.
2) each via node is according to the channel information h estimated kand g k, calculate the initial time value of timer.Detailed process is as follows:
2.1, source node is with constant power P stransmission information, the signal of transmission is s, and the signal that so a kth via node receives is:
y r k = P S h k s + n r
Wherein n rfor the additive white Gaussian noise that via node place introduces, its power is
2.2, can calculate according to the channel information estimated the energy that in this time slot, a kth via node is collected is:
E k＝ξP S|h k| 2αT
Wherein ξ is the conversion efficiency of energy collection circuit, and T is the length of a time slot as shown in Figure 2, and α is the time ratio of via node for collection of energy, and namely energy acquisition time accounts for the ratio of whole time slot.
2.3, in this letter energy simultaneous interpretation junction network, via node utilizes the energy collected from source node that information is transmitted to destination node, and as shown in Figure 2, selected via node utilizes time sends information to destination node, therefore its transmitted power is:
P r k = E k ( 1 - α ) T 2 = 2 ξ P S | h k | 2 α ( 1 - α )
2.4, the signal that destination node place receives is:
wherein n dfor the purpose of Nodes introduce white Gaussian noise, power is
2.5, according to various above, the signal to noise ratio at destination node place can be obtained:
γ D k = 2 ξ P S 2 | h k | 4 | g k | 2 α 2 ξα P S | h k | 2 | g k | 2 σ r 2 + σ d 2 ( 1 - α ) ( P S | h k | 2 + σ r 2 )
2.6, so for based on the maximum relay selection strategy of harvest energy, timer initial time τ kfor 1/E k; Based on the relay selection strategy of maximum signal to noise ratio, timer initial time τ kfor if via node knows the channel information of forward link and backward link, the relay selection strategy so based on maximum signal to noise ratio can obtain best systematic function.In order to reduce the computation complexity of via node and obtain backward link channel information time used, network can adopt and obtain the compromise of operating cost and performance based on the relay selection strategy that harvest energy is maximum.
3) timer takes the lead in returning relay node broadcasts claim data bag of 0, timer takes the lead in returning the via node of 0 to utilize described claim data bag to notify, and other via nodes and source node oneself are cooperative node, after other via nodes receive claim data bag, timer all makes zero, and (each via node carries out channel estimating in the time slot incipient stage to keep dormancy in subsequent data transmission process simultaneously, energy collected by calculating or the time of signal to noise ratio negligible, therefore, ensure that timer is started working simultaneously), when there being the timer of two or more via node to return 0 simultaneously, timer returns the via node of 0 in current time slots, again initiate competition after random back a period of time simultaneously, the via node taking the lead in broadcasting claim data bag is cooperative node.
Emulation experiment and effect analysis
Simulation parameters is: relaying number N=4, the transmission rate R=1 bits/sec/Hz of source node, conversion efficiency ξ=1 of energy collection circuit, via node is used for time ratio α=0.3 of collection of energy, the power that via node and destination node introduce noise is all 1/2, channel parameter λ h=λ g=1.
Analysis of simulation result, as seen in Figure 4, the system of selection based on maximum signal to noise ratio of the present invention is better than based on the maximum system of selection of harvest energy.And two kinds of relay selection method that the present invention proposes all are better than the method for a Stochastic choice relaying.

Claims (5)

1. be applicable to a distributed relay selection method for letter energy simultaneous interpretation junction network, it is characterized in that: comprise the following steps:
Each via node is by the channel condition information of the communicate forward link of estimating self respectively and the backward link with source node and destination node, then each via node calculates the competition time of self according to the channel condition information estimated and the competition function of time, the via node competing shortest time is in each time slot chosen as cooperative node, the information of source node is transmitted to destination node through cooperative node, and the described competition function of time is based on the maximum relay selection construction of strategy of harvest energy or the relay selection construction of strategy based on maximum signal to noise ratio.
2. a kind of distributed relay selection method being applicable to letter energy simultaneous interpretation junction network according to claim 1, it is characterized in that: in the letter energy simultaneous interpretation junction network comprising source node, destination node and multiple via node, utilize relay selection policy selection via node as the cooperative node participating in cooperation transmission, the information of source node is transmitted to destination node through cooperative node, and idiographic flow comprises:
1) via node estimates the channel condition information of described forward link and backward link;
2) via node is according to the channel condition information estimated and the competition time calculating self based on the competition function of time of the relay selection construction of strategy of correspondence, and using the competition time as self timer initial time;
3) via node with minimum timing device initial time takes the lead in returning 0 and broadcasting a claim data bag due to timer, and the via node with minimum timing device initial time utilizes described claim data bag notification source node oneself to be cooperative node.
3. a kind of distributed relay selection method being applicable to letter energy simultaneous interpretation junction network according to claim 1 or 2, is characterized in that:
When adopting based on the relay selection strategy that harvest energy is maximum, the determination of described cooperative node specifically comprises the following steps:
2.1) each via node estimates the channel condition information of described forward link simultaneously;
2.2) via node is according to the channel condition information of the forward link estimated, calculates the energy that themselves capture arrives:
E k＝ξP S|h k| 2αT
Wherein, E kfor the energy that a kth via node is collected, h kfor the channel condition information of the forward link of a kth via node, P sfor source node sends the power of information, α is the time ratio of via node for collection of energy, and ξ is the conversion efficiency of energy collection circuit, and T is the time span of a time slot;
2.3) kth self timer initial time τ of via node setting kfor 1/E k, timer takes the lead in returning relay node broadcasts claim data bag of 0, and timer takes the lead in returning the via node of 0 to utilize described claim data bag notification source node oneself to be cooperative node.
4. a kind of distributed relay selection method being applicable to letter energy simultaneous interpretation junction network according to claim 1 or 2, is characterized in that:
When adopting the relay selection strategy based on maximum signal to noise ratio, the determination of described cooperative node specifically comprises the following steps:
3.1) each via node estimates the channel condition information of described forward link and backward link simultaneously;
3.2) noise power introduced according to the channel condition information estimated and via node place and destination node place of via node with calculate the signal to noise ratio at destination node place:
γ D k = 2 ξ P S 2 | h k | 4 | g k | 2 α 2 ξα P S | h k | 2 | g k | 2 σ r 2 + σ d 2 ( 1 - α ) ( P S | h k | 2 + σ r 2 )
Wherein, for the signal to noise ratio at destination node place when a kth via node participates in cooperating, h kfor the channel condition information of the forward link of a kth via node, g kfor the channel condition information of the backward link of a kth via node, P sfor source node sends the power of information, α is the time ratio of via node for collection of energy, and ξ is the conversion efficiency of energy collection circuit;
3.3) kth self timer initial time τ of via node setting kfor timer takes the lead in returning relay node broadcasts claim data bag of 0, and timer takes the lead in returning the via node of 0 to utilize described claim data bag notification source node oneself to be cooperative node.
5. a kind of distributed relay selection method being applicable to letter energy simultaneous interpretation junction network according to claim 2, it is characterized in that: when the timer of two or more via node returns 0 simultaneously, described two or more via node again broadcasts a claim data bag in current time slots after random back a period of time, the via node taking the lead in broadcasting claim data bag is cooperative node.
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CN105375955A (en) * 2015-10-26 2016-03-02 西安电子科技大学 Cooperative transmission method in simultaneous wireless information and power transfer relay network
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CN107295598B (en) * 2017-08-08 2020-07-24 吉林大学 Relay selection method suitable for energy and information simultaneous transmission network grouping
CN108811023B (en) * 2018-05-04 2020-06-19 华南理工大学 Firefly algorithm-based relay selection method for SWIPT cooperative communication system
CN110167204B (en) * 2019-05-08 2020-05-19 燕山大学 Relay transmission strategy selection and power distribution method based on MS-BAS algorithm
CN110167204A (en) * 2019-05-08 2019-08-23 燕山大学 A kind of relay transmission policy selection and power distribution method based on MS-BAS algorithm
CN110113797A (en) * 2019-05-17 2019-08-09 中国科学技术大学 A kind of node selecting method and device
CN110475310A (en) * 2019-09-27 2019-11-19 重庆邮电大学 A kind of wireless energy collection network selection cooperation transmission method based on ARQ
CN110475310B (en) * 2019-09-27 2022-11-08 重庆邮电大学 ARQ-based wireless energy collection network selection cooperative transmission method
CN111866985A (en) * 2020-07-30 2020-10-30 广西华南通信股份有限公司 Hybrid relay selection method for dense communication networks

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