Multi-rate adaptive cooperative access method and system
An access method and access system technology, which are applied in the field of multi-rate adaptive cooperative access methods and systems, and can solve problems such as large transmission delay.
Active Publication Date: 2014-05-07
BEIHANG UNIV
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[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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[0066] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0067] figure 1 It is a flow chart of Embodiment 1 of the multi-rate adaptive cooperative access method of the present invention, as shown in figure 1 As shown, the method of the present embodiment includes:
[0068] Step 11, after the destination node fails to receive the data packet sent by the source node, it returns a NACK (Negative Acknowle...
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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 multi-rate self-adaptive cooperative access method and system. Background technique [0002] The access method or medium access control (Medium Access Control, hereinafter referred to as: MAC) 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, the source node 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 the signal of one path is strong enough, reliable communication can be guaranteed. The cooperative MAC method is to use the advantages provided by cooperative diversity in the physical layer to reasonably arra...
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IPC IPC(8): H04W74/08
Inventor 刘锋刘凯王梦迪
Owner BEIHANG UNIV