Novel multi-channel medium access control method of wireless sensing network

Abstract

The invention discloses a novel multi-channel medium access control method of a wireless sensing network, comprising the following steps of extracting a clock, a physical address and superframe information from a received beacon; taking the extracted physical address as a seed by an arbitrary node which receives beacons of other nodes to obtain a pseudo random sequence and calculating channels located by other nodes according to the pseudo random sequence; acquiring an awakening time slice of a receiving party according to the extracted superframe information and carrying out random delay andsignal strength detection by the arbitrary node when the arbitrary node sends data to the receiving party. The invention enhances the reliability of the network, efficiently avoids signal conflict bydividing a large superframe into a plurality of small time slices, simultaneously realizes a mechanism that nodes with different superframe sizes are mutually communicated and also ensures that transmission of generated data is not influenced by utilizing the withdrawn mechanism after collision so as to realize successful current data communication.

Description

technical field [0001] The invention relates to a novel multi-channel medium access control method of wireless sensor network. Background technique [0002] Wireless sensor network (WSN) is a multi-hop self-organizing network system formed by a large number of inexpensive micro sensor nodes deployed in the monitoring area through wireless communication. In the multi-channel MAC communication protocol, many nodes in the network are scattered in different channels, which reduces the communication competition, especially the multi-channel MAC communication protocol negotiated in parallel, overcomes the bottleneck problem of the control channel and greatly improves the network throughput. and network immunity. In the multi-channel mac mechanism in the existing wireless sensor network, the entire network adopts a unique big slot (super frame), and the signal strength detection used is only realized by hardware, and there is no effective mechanism to avoid collision in software. ...

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Problems solved by technology

In this way, the time slice can be effectively used, but in this way, the nodes need to exchange control information on the control channel before each communication to reserve the time slice, which increases the network communication overhead and the dependence on the control channel, which is not conducive to Networks improve throughput and rely on interference

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