A communication method based on mac layer of ad-hoc network

Abstract

The invention discloses a communication method based on a mac layer of an ad-hoc network. The method comprises the steps of dividing channels into busy tone channels, adjacent node sensing channels and data channels, dividing the busy tone channels into a sending busy tone channel and a receiving busy tone channel, hanging up the receiving busy tone by a receiving node when the receiving node starts receiving, hanging up the sending busy tone by a sending node after t1 when the sending node starts sending, completing RTS handshakes by the other peripheral concurrent transmission nodes betweent0 and t1, detecting the state of the receiving busy tone channel when the sending node is about to complete the sending of DATA, labeling correspondingly in a CS section, and after the receiving nodesuccessfully receives DATA, changing a competition window sent by an ACK according to the content of the CS section. According to the method provided by the invention, the introduced ACK confirmationmechanism is controllable in a delayed manner under the condition of concurrent transmission; the problem that the ACK is invalid due to DATA interference when the adjacent two sections of links arein concurrent transmission under a specific environment is solved; the dual-busy tone mechanism of the DBTMA is improved, the damaged link is interrupted in time, continuity and diffusion of the interference are avoided as much as possible, and the whole network performance is improved.

Description

technical field [0001] The invention relates to a communication method based on the mac layer of the ad-hoc network. Background technique [0002] Compared with the static network, in the ad-hoc network, the node mobility is high, and the network topology changes quickly. The ad-hoc network can be used in fast networking situations, such as emergency communication recovery, disaster relief and rescue. At present, ad-hoc networking also has broad application prospects in drone control and intelligent driving. Based on the large coverage of the ad-hoc network and not limited by the wireless transmission area, for any number of nodes that are not in the communication range, the node forwarding packet, that is, the multi-group access mode, can be selected. [0003] Existing protocols show good adaptability in static and low-mobility networks, but do not perform well in high-mobility networks. For example, in the IEEE802.11MAC protocol, a newly added high-mobility node may not ...

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Problems solved by technology

[0004] Compared to the IEEE802.11MAC protocol and the DBTMA protocol (Haas Z, Deng J.Dual Busy Tone Multiple Access (DBTMA): A New Medium Access Control for PacketRadio Networks [J] IEEE ICUPC, 1998, (2): 973-977), The introduction of dual busy tone multiple access solves the problem of hidden terminals and exposed terminals to a large extent, but the DBTMA protocol does not have an ACK data reception confirmation mechanism, resulting in unreliable data transmission. down is unacceptable

In the existing literature, a method of combining the DBTMA protocol with the ACK response mechanism is proposed, but it does not consider the interference of other nodes' DATA transmission on the local node's ACK reception in the single-channel concurrent transmission environment.

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