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A method for selecting battery-powered relay nodes

A relay node and battery technology, applied in the field of mobile communications, can solve the problems of unfavorable guarantee network performance, unbalanced load of relay equipment, increase the difficulty of system resource scheduling and system complexity, etc., so as to improve the network life cycle and guarantee Effect of data transfer rate

Inactive Publication Date: 2019-09-10
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing relay selection algorithms usually consider selecting the relay link with the best channel conditions for transmission, but this will bring some practical problems, such as when the relay device is a battery-powered device, the energy of the selected relay device will be lost fast consumption
This is because the selection of relays does not consider fairness. The unfair selection of relays leads to unbalanced relay device loads, which increases the difficulty of system resource scheduling and system complexity. At the same time, for relays with battery energy storage The cooperative communication network in which devices participate will reduce the life time of the network, which is very unfavorable for ensuring network performance

Method used

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Embodiment Construction

[0015] Taking a system network constructed by one source node, M battery-powered relay nodes and one destination node as an example, the technical solution of the present invention and the demonstration steps of simulation selection are further described below.

[0016] A cooperative transmission is divided into two time slots. In the first time slot, the source node transmits data to the destination node and all relay nodes. In the second time slot, the selected relay node transmits data to the destination node. The destination node uses a maximum ratio combining technique (MRC: Maximal Ration Combining) to combine received signals. Assuming that the channel state between the source node and the destination node is poor, the destination node cannot correctly demodulate the signal from the source node, so the direct link between the source node and the destination node is ignored. Assumptions¶ 1i and gamma 2i are the signal-to-noise ratios of the link from the source node to...

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Abstract

The invention discloses a method for selecting a battery power supply relay node. The method screens candidate relay nodes respectively according to conditions of a link signal-to-noise ratio and surplus electric power of nodes, is started from improvement on spectral efficiency of a system, consideration to energy consumption fairness of the nodes and promotion of user experience satisfaction, obtains balance between transmission efficiency and network life time, and ensures a data transmission rate when prolonging a network life cycle.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and in particular relates to a selection method of a battery-powered relay node in a cooperative communication system. Background technique [0002] Cooperative communication uses multiple single-antenna nodes to form a virtual MIMO system. Due to the addition of relay nodes, mobile stations can choose different relay nodes for data forwarding to improve spectrum efficiency and expand network coverage. Therefore, how to choose cooperative communication? Relay nodes are a primary problem to solve. According to the number of nodes selected, it can be divided into single-relay and multi-relay. Single-relay has higher spectrum utilization than multi-relay. The outage probability of multi-relay is greater than that of multi-relay. Metrics to measure the performance of relay selection usually include capacity and outage probability, and capacity can be measured in terms of maximum data r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W40/10H04W40/22
CPCH04W40/10H04W40/22Y02D30/70
Inventor 何花肖琨
Owner GUANGXI NORMAL UNIV