Wireless channel access scheme

Abstract

The invention relates to a wireless channel access scheme which is characterized in that a hidden / display receiving terminal waits according to the time information of RTS or CTS frame in a node pair of the communication when the hidden / display receiving terminal and a deaf transmitting node appear in the nodes of a network because of competing for channels and relays the transmitting time; when an NAV calculagraph of the hidden / display receiving terminal is 0 and the hidden / display receiving terminal detects that the channel is idle, the hidden / display receiving terminal transmits a CCS control frame to the corresponding deaf transmitting node and informs the deaf transmitting node for immediate communication; and the deaf transmitting node determines that the channel of the receiving end is idle and carries out communication immediately after receiving the CCS control frame. In the invention, the new control frame CCS is introduced on the basis of IEEE802.11DCF, the time for the node to access to the channel can be effectively adjusted, the blindness of channel access caused by inconsistent state information of the channel of the receiving nodes and transmitting nodes is reduced, the probability of conflict packet loss is reduced, and the network throughput and the fairness between flows are enhanced.

Description

【Technical field】 [0001] The present invention relates to a wireless channel access scheme, more specifically, to a wireless channel access scheme applied in the field of wireless multi-hop communication. 【Background technique】 [0002] In a wireless network, due to the shared nature of the channel, only one pair of nodes is allowed to communicate in a certain area, and other nodes must wait for the end of the data transmission process before starting a new round of channel competition and determining the next round of communication. The right to use the channel; otherwise, data conflicts will result, resulting in transmission failure. [0003] The channel access solution mainly solves how to allocate wireless channels among competing users. Currently, widely used wireless products often adopt the IEEE 802.11 protocol. The IEEE 802.11 protocol is an access protocol based on Carrier Sense Multiple Access / Collision Avoidance (CSMA / CA). In order to avoid conflicts as much as ...

AI Technical Summary

Problems solved by technology

But for hidden / explicit receiving terminal nodes F and D, they will delay the time of sending CTS, causing the sender nodes C and E corresponding to nodes D and F to become "deaf" because they did not receive the feedback frame CTS within the predetermined time. "The sending node, the sender C and E nodes continue to send RTS frames to D or F node until the number of retransmissions of the RTS frame reaches the maximum value, eventually resulting in packet loss and communication failure

It can be seen that in the wireless multi-hop network, the existing wireless channel access scheme has the problem of data loss caused by the channel being occupied, the hidden / displayed receiving terminal cannot immediately send a CTS frame to the transmitting end, resulting in multiple invalid accesses

Images