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Multi-relay selection cooperative transmission method and system

A technology of cooperative transmission and cooperative nodes, which is applied in the field of cooperative transmission methods and systems for multi-relay selection, can solve the problems of shortening transmission delay, large data transmission delay, and high packet collision rate, and achieves shortening data transmission delay, The effect of improving data throughput

Inactive Publication Date: 2011-04-13
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a cooperative transmission method and system for multi-relay selection, so as to solve the problems of large data transmission delay and high packet collision rate existing in the existing cooperative transmission method, and improve the throughput of data transmission , to shorten the transmission delay

Method used

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  • Multi-relay selection cooperative transmission method and system
  • Multi-relay selection cooperative transmission method and system

Examples

Experimental program
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Embodiment 1

[0038] figure 1 A schematic flowchart of Embodiment 1 of the coordinated transmission method for multi-relay selection in the present invention, as shown in figure 1 As shown, the method may include the following steps:

[0039] Step 101, the sender selects the first coordinating node according to the coordinating table of the first coordinating node stored by itself, and sends a CRTS packet to the receiving party and the first coordinating node, and the CRTS group includes the nodes of the first coordinating node logo;

[0040] First, each node in the network maintains a node cooperation table for each adjacent receiving node, and the node cooperation table can be referred to in Table 1 below. When its neighboring nodes meet the conditions of becoming a cooperative node, they will be recorded in the cooperative table of the node.

[0041] Table 1 Node cooperation table

[0042] ID

update time

R sd

R sh

R hd

number of failures

Collabor...

Embodiment 2

[0066] In this embodiment, the cooperation mode initiated by the sender and the receiver is basically the same as that in the first embodiment, and is also based on the steps described in the first embodiment. The difference from Embodiment 1 is that the sender in this embodiment fails to designate the first coordinating node, which leads to a corresponding change in the cooperative initiation mode of the sending and receiving parties. This embodiment only briefly describes the cooperation method when this situation occurs, and other corresponding specific cooperation steps may refer to the first embodiment.

[0067] Figure 5 A schematic diagram of transmission when the sender fails to specify the first coordinating node for Embodiment 2 of the cooperative transmission method for multi-relay selection of the present invention. Such as Figure 5 As shown, after receiving the CRTS packet sent by the sender, the receiver does not receive the first RTH packet of the first coord...

Embodiment 3

[0073] Figure 6 It is a schematic diagram of the transmission when the receiving party fails to specify the second coordinated node in Embodiment 3 of the cooperative transmission method for multi-relay selection of the present invention. Such as Figure 6 As shown, the situation addressed in this embodiment is that the receiver does not receive the second RTH packet within the preset time after sending the HCS packet to the second coordinating node. , the receiver can directly determine the first coordination node as the final coordination node.

[0074] Specifically, the receiver may encounter the following situation: the second node coordination table maintained by the receiver is empty, that is, the receiver cannot find a suitable coordination node; or, after the receiver sends the HCS group, the receiver specified When the second coordinating node cannot participate in the coordinating due to the busy channel around or some reasons of its own, the receiver does not rec...

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Abstract

The invention provides a multi-relay selection cooperative transmission method and a multi-relay selection cooperative transmission system. The method comprises the following steps that: a sender selects a first cooperative node and sends a cooperative request-to-send (CRTS) packet to a receiver and the first cooperative node; the first cooperative node sends a first request-to-helper (RTH) packet to the sender and the receiver; after receiving the first CRTS packet and the first RTH packet, the receiver selects a second cooperative node and sends a helper-to-send (HTS) packet to the second cooperative node; the second cooperative node replies a second RTH packet to the sender and the receiver; the receiver determines a final cooperative node and sends a cooperative clear-to-send (CCTS) packet to the sender; and the sender transmits data to the receiver through a final cooperative node. By using the method, the problem of collision caused by the participation of a plurality of intermediate nodes at the same time is solved; data transmission delay is effectively shortened; and data throughout is improved.

Description

technical field [0001] The invention relates to media access control technology, in particular to a cooperative transmission method and system for multi-relay selection. Background technique [0002] The Media Access Control (MAC for short) method solves the problem of how multiple nodes or users share channel resources quickly, efficiently, fairly and reliably. The quality of the MAC method directly affects the quality of network throughput, delay and other performance indicators. In wireless communication, multipath fading is an important factor affecting communication quality, and traditional wireless communication usually widely adopts diversity technology to reduce the influence of multipath fading. The so-called diversity means that in order to ensure the quality of transmission, the sender adopts a certain method to transmit multiple copies of the same signal through mutually independent fading channels. Since the fading of each path is independent of each other, rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W48/20H04W74/08
Inventor 刘凯刘锋张玉鹏王哲
Owner BEIHANG UNIV
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