Cooperative channel access method and cooperative communication system capable of guaranteeing quality of service

Abstract

The invention provides a cooperative channel access method and a cooperative communication system capable of guaranteeing quality of service, wherein the method is characterized in that a plurality of transmitter nodes compete for the access to a channel according to the priorities of respective to-be-transmitted service packets and a winning transmitter node with the highest priority obtains access to the channel; the winning transmitter node sends a CRTS packet to the channel; a receiver node receives the CRTS packet on the channel and replies with a CCTS packet; a plurality of cooperative nodes compete for the access to the channel according to the CRTS packet and the CCTS packet and a winning cooperative node with the highest priority obtains the access to the channel; and the winningtransmitter node transmits the service packet to the receiver node through the transmission of the winning cooperative node. The method and system can better guarantee the quality of service under high speed information transmission, thereby meeting the requirement of service real time for users.

Description

technical field [0001] The invention relates to a cooperative channel access method and a cooperative communication system for guaranteeing service quality, and belongs to the technical field of wireless communication. Background technique [0002] In wireless communication, factors such as channel fading and channel quality deterioration will lead to a decrease in communication quality and a reduction in communication range. In this case, in order to ensure the communication between nodes, the method of increasing the transmission power of nodes is usually adopted, but the increase of transmission power will not only bring unnecessary interference, but also consume a lot of energy. Another solution is to use a node relay method, that is, one or more nodes perform one or more relays between nodes, so as to realize multi-hop communication. At present, a Multiple-Input Multiple-Output (MIMO for short) system can provide greater diversity gain, greatly improve communication qu...

AI Technical Summary

Problems solved by technology

[0004] However, the defect of this technology is that the collaboration table is updated according to the communication result after each data transmission is completed.

[0006] However, the defect of this technology is that at the beginning of each time slot, the cooperative nodes that satisfy the conditions participate in the competition with different probabilities, and high-quality cooperative nodes and low-quality cooperative nodes will collide, which brings unnecessary delay

[0009] However, the defect of this mechanism is that in the process of data transmission, cooperative communication is not used. Due to factors such as channel fading, the rate of direct data transmission between the sender and the receiver will be low, increasing the transmission time and reducing the quality of the network. Throughput

[0011] However, the defect of this technology is that the DC-MAC technology allows the appropriate relay node to participate in the cooperative retransmission after the direct transmission fails, but instead of immediately performing the cooperative retransmission, the relay node re-competes for the TXOP, and the transmission fails. The service may have to wait for one or even several service transmissions to be completed before retransmission, which is not conducive to ensuring the QoS requirements of real-time services

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