Media access control method for wireless sensor network

Abstract

The invention discloses a media access control method for a wireless sensor network, which is applicable to the field of wireless network design; wherein, network nodes are divided into cluster-head nodes and ordinary nodes; an operational process runs in a periodic mode and an operation cycle is divided into four stages, namely a synchronization stage, a data stage, a sleep stage and a request stage; the specific operational process comprises: the ordinary nodes send data traffic and routing information to the cluster-head nodes in the request stage of each cycle; the cluster-head nodes calculate the cycle length and the duty radio and send the cycle length and the duty radio to the ordinary nodes in the synchronization stage of the next cycle; the ordinary nodes receive a synchronization package, set own cycle length and duty radio and update the local time in the synchronization stage, carry out data communication in the data stage and enter a sleep state to reduce power consumption in the sleep stage. The method of the invention effectively solves the problems in the present wireless sensor network, namely the synchronization and the self-adaption of data traffic, reduces the energy consumption of nodes and the delay time of data packages and increases the transmissibility of data packages at the same time.

Description

technical field [0001] The present invention relates to the field of wireless network, especially to the field of wireless sensor network and protocol design, specifically provides a medium access control method for wireless sensor network, although the given features can be applied to other network designs. Background technique [0002] In a wireless sensor network, the nodes are generally powered by batteries and their capacity is small. After the nodes are distributed in the actual environment, the batteries are difficult to replace. Therefore, energy is the focus of protocol design, followed by important factors such as delay time and data transmission rate. The MAC protocol in wireless sensor networks is one of the keys that affect the above performance. [0003] At present, in the design of wireless sensor network MAC protocol, nodes generally adopt periodic listening and sleep scheduling. A running cycle has a fixed length and is divided into two parts, listening and...

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Problems solved by technology

[0006] Technical solution: The media access control method for wireless sensor networks of the present invention, in order to solve the problem of time-consuming and energy-consuming synchronization process, and the problem of low protocol performance under the environment of node data flow changes, the MAC is designed based on node clustering The protocol divides network nodes into cluster head nodes and ordinary nodes and undertakes different functions. The operation process runs in a periodic manner

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