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Distributed collaborative multiple access method and system thereof

A distributed cooperation and access method technology, applied in the field of distributed cooperative multiple access methods and systems, can solve the problems of cooperative node competition conflicts, outdated historical information, large competition delay, etc., to avoid competition conflicts, The effect of saving channel resources and reducing reservation waste

Inactive Publication Date: 2010-06-30
BEIHANG UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a distributed cooperative multiple access method and system, which can effectively solve the problem of outdated historical information in existing cooperative multiple access methods, causing large competition conflicts between cooperative nodes or large competition delays and other technical defects

Method used

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  • Distributed collaborative multiple access method and system thereof
  • Distributed collaborative multiple access method and system thereof
  • Distributed collaborative multiple access method and system thereof

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Embodiment Construction

[0044] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0045] figure 1 It is a flow chart of the distributed coordinated multiple access method of the present invention, including:

[0046] Step 1. According to the cooperation table stored and maintained, the source node selects two candidate nodes for cooperation and sets the priority to send a CRTS packet, which contains the addresses and priorities of the two candidate nodes;

[0047] Step 2, the destination node receives the CRTS packet, calculates the highest channel rate that can be supported between the source node and the destination node, and sets the channel rate in the CCTS packet to feed back to the source node;

[0048] Step 3, after the two candidate nodes overhear the CRTS grouping and CCTS grouping, judge whether the cooperation condition is met, and the candidate node meeting the cooperation condition sen...

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Abstract

The invention relates to a distributed collaborative multiple access method and a system thereof, the method comprises the steps that: according to a stored and maintained collaboration list, a source node selects two candidate nodes used for collaboration, sets a priority level and then sends out a CRTS grouping, and the CRTS grouping comprises the addresses and the priority level of the two candidate nodes; a destination node receives the CRTS grouping, calculates the highest channel speed supported between a source node and the destination node, and sets the channel speed into a CCTS grouping for feedback to the source node; after the CRTS grouping and the CCTS grouping are monitored, whether the two candidate nodes meet the collaborative condition is met is judged, and the candidate node meeting the collaborative condition is taken as a collaborative node and sent into a RTH grouping according to the preset priority policy; and according to the RTH grouping, the source node sends a data grouping to the destination node. By selecting the two candidate nodes and setting the priority level, the invention not only effectively shortens the time in competitive stage, but also effectively avoids competitive conflict and saves the channel resource.

Description

technical field [0001] The present invention relates to a multiple access method and system, in particular to a distributed cooperative multiple access method and system. Background technique [0002] The multiple access (ie, medium access control, MAC for short) method is used to solve the problem of how multiple nodes or users share channel resources quickly, efficiently, fairly and reliably. In wireless communication, multipath fading is an important factor affecting communication quality. Diversity technology is widely used in traditional wireless communication to reduce the impact of multipath fading. The so-called diversity means that in order to ensure the quality of transmission, the sending end 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, as long as there is a signal of one path that is strong enough to ensure reliable communication. ...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L1/00H04L1/16
Inventor 张军刘凯刘云曾峰高强
Owner BEIHANG UNIV
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