Wireless distributed cooperative network opportunistic channel access method based on threshold measurement

The invention discloses a wireless distributed cooperative network opportunistic channel access method based on threshold measurement. The method comprises the following steps: firstly, each information source node sends an RTS data packet to independently compete for a channel; the relay node sends the RTS data packet to the information sink node, and the information sink node sends the CTS datapacket to all the relay nodes for reply; then all the relay nodes send CTS data packets to the information source node in sequence, and the CTS data packets are inserted into the channel state from the information source node to the relay nodes; after the CTS data packet is received, the information source node calculates to obtain a relay node sequence capable of realizing the maximum transmission speed, and calculates a threshold value; and finally, the information source node performs measurement according to the threshold value and decides whether to access a channel for cooperative transmission or not. After the