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Multi-rate adaptive cooperative access method and system

An access method and self-adaptive technology, applied in the field of network communication, can solve problems such as large transmission delay

Active Publication Date: 2012-05-02
BEIHANG UNIV
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Problems solved by technology

[0005] The present invention provides a multi-rate self-adaptive cooperative access method and system, which is used to solve the technical problem that in the prior art, when all possible intermediate nodes participate in the cooperation in the destination node-initiated cooperation method, a relatively large transmission delay is likely to be caused

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  • Multi-rate adaptive cooperative access method and system
  • Multi-rate adaptive cooperative access method and system

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Embodiment Construction

[0066] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0067] figure 1 This is a flowchart of Embodiment 1 of a multi-rate adaptive cooperative access method according to the present invention, such as figure 1 As shown, the method of this embodiment includes:

[0068] Step 11. After the destination node fails to receive the data packet sent by the source node, it replies a NACK (Negative...

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Abstract

The invention relates to a multi-rate adaptive cooperative access method and a multi-rate adaptive cooperative access system. The multi-rate adaptive cooperative access method comprises the following steps that: after failing to receive a data packet from a source node, a destination node returns a negative acknowledgement (NACK) packet to the source node; after intercepting the NACK packet, intermediate nodes perform cooperative handshaking processing with the destination node according to basic cooperation conditions and rate grading conditions, and cooperative nodes are selected from the intermediate nodes; and the cooperative nodes transmit the received data packet to the destination node. By the method and the system provided by the invention, unnecessary conflicts of competition are effectively avoided, and are decomposed by adopting rate grading, so that an extremely small number of cooperative nodes can be selected from a great number of intermediate nodes within the shortest time, a data transmission delay is effectively shortened, and the data transmission performance of the network is improved.

Description

Technical field [0001] The present invention relates to network communication technology, in particular to a method and system for multi-rate adaptive cooperative access. Background technique [0002] An access method or a medium access control (Medium Access Control, hereinafter referred to as MAC) method solves the problem of how multiple nodes or users can quickly, efficiently, fairly and reliably share channel resources. The quality of the MAC method directly affects the quality of performance indicators such as network throughput and delay. In wireless communication, the source node uses a certain method to transmit multiple copies of the same signal through independent fading channels. Since the fading of each path is independent of each other, as long as the signal of one path is strong enough, reliable communication can be guaranteed. The cooperative MAC method utilizes the advantages provided by cooperative diversity at the physical layer to rationally arrange users to ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
Inventor 刘锋刘凯王梦迪
Owner BEIHANG UNIV
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