Multichannel cooperative data transmission method and system

Abstract

The invention discloses a multichannel cooperative data transmission method and system. The method of the invention comprises the following steps: a sender sends a cooperative request-to-send (CRTS) packet carrying a data channel number to a receiver through a first control channel; after the receiver receives the CRTS packet, if the acquired data channel is judged to be usable, the receiver returns a conditional clear-to-send (CCTS) packet carrying the highest channel rate between the receiver and the sender to the sender; a candidate cooperative node intercepts the CRTS packet and the CCTS packet, and if the acquired data channel is judged to be usable and the cooperation condition is met, the candidate cooperative node sends a high (HI) packet according to access time delay; if the receiver only receives the HI packet, the receiver sends a relay acknowledgement (RACK) packet on the first control channel to disclose the cooperative node; if the sender receives the RACK packet, the sender sends a data packet to the receiver through the cooperative node; and after the receiver successfully receives the data packet, the receiver returns an acknowledgement packet through a second control channel. The invention can be used to realize efficient and reliable data transmission.

Description

technical field [0001] The present invention relates to wireless communication technology, in particular to a multi-channel cooperative data transmission method and system. Background technique [0002] Wireless communication technology is the fastest growing and most widely used communication technology in the field of communication in recent years. In wireless communication, due to channel fading and path loss, the received signal quality will be greatly degraded compared to that in wired channels. For this reason, various anti-interference and anti-noise wireless communication technologies have been proposed at present. Multiple-Input Multiple-Output (MIMO) is one of the methods that utilize space diversity to greatly improve signal quality. Cooperative communication technology uses the idea of ​​MIMO to form a virtual antenna array (VAA) through antennas distributed on different nodes to achieve the effect of MIMO diversity. Compared with non-cooperative systems, the ...

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Problems solved by technology

However, the transmission of the cooperative node will affect the normal transmission of other nodes outside the communication range of the receiver / transmitter and within the communication range of the cooperative node, and may cause collisions with signals sent by other nodes, so that the channel utilization The rate is low, which inhibits the transmission efficiency in the wireless network

[0008] To sum up, the wireless data transmission method in the prior art cannot make full use of the channel and effectively avoid signal conflicts, so that efficient data transmission cannot be achieved

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