High speed mobile customer relay node selection method in cellular system coordination communication

A relay node and cooperative communication technology, which is applied in the direction of selection device, diversity/multi-antenna system, radio/inductive link selection arrangement, etc., can solve the problem of frequent switching of relay users, low success rate of relay user selection, duration Short and other problems, to increase the success rate and relay duration, reduce the effect of switching probability

Inactive Publication Date: 2009-03-25
HARBIN INST OF TECH
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Problems solved by technology

[0004] In order to solve the problem that the current relay node selection method for high-speed mobile users has a low success rate of relay user selection, and the duration of successful

Method used

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  • High speed mobile customer relay node selection method in cellular system coordination communication
  • High speed mobile customer relay node selection method in cellular system coordination communication
  • High speed mobile customer relay node selection method in cellular system coordination communication

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specific Embodiment approach 1

[0014] Step 1. The base station measures the Doppler frequency shift of each node entering the cell, and divides the nodes into three groups according to the measurement results of the Doppler frequency shift: forward moving group L, reverse moving group R and Low-speed group S, and notify each node of the group information;

[0015] Step 2, the source node sends a coordinated communication request to the base station and each node at the same time;

[0016] Step 3: The base station sends a communication confirmation message to the source node, and at the same time, the nodes around the source node in the same group as the source node receive the cooperative communication request from the source node, send a request to the base station to communicate with the source node, and report the communication with the source node. The channel quality between nodes in different groups ignores the cooperative communication request sent by the source node;

[0017] Step 4: The base stati...

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Abstract

A method for selecting a high-speed mobile user relay node in the coordination communication of a cellular system relates to a selection method of a relay node, which solves the problems that the selection success rate of a relay user is low, after the selection is realized, the duration is short, and the frequent handover is required in the selection method of the high-speed mobile user relay node currently. The method comprises the following steps: a base station groups each node entering a cell; a source node sends out a coordination communication request; the base station sends out communicable confirmation information to the source node, and the node which is positioned in the same group as the source node sends out a request which can carry out the coordination communication and the channel quality between the node and the source node to the base station simultaneously; the base station selects the node with the best channel quality as the relay node, and allocates a relay channel; and when the channel quality between the relay node and the source node or the channel quality between the relay node and the base station is lower than the threshold value, the base station re-selects a new relay node, and is used for stopping the relay through sending out an instruction or responding a request directly communicating with the source node.

Description

technical field [0001] The invention relates to a method for selecting a relay node, and in particular to a cooperative communication technology in the field of wireless communication. Background technique [0002] In the field of wireless communication, when the transmission signal arrives at the receiving end through multiple paths, multipath fading will occur, which seriously affects the normal reception of the signal, and diversity is one of the effective techniques to combat fading. Diversity technology includes time diversity, frequency diversity and space diversity, etc. Cooperative communication technology is a kind of space diversity technology. The basic idea of ​​cooperative communication is that users can share each other's antennas to build a virtual multiple-input multiple-output system, which enables multi-user single-input single-output (SISO) systems to obtain the benefits of multiple-input multiple-output (MIMO) systems. At the same time avoid the impact o...

Claims

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Application Information

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IPC IPC(8): H04Q7/38H04Q7/22H04B7/02
Inventor 沙学军王荆宁卢为党孙丽楠蒋韡琳张中兆张乃通
Owner HARBIN INST OF TECH
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