Medium access control (MAC) layer node scheduling method based on beacon frame synchronization and communication asynchronization

Abstract

The embodiment of the invention discloses a listening period dynamic adjustment medium access control (MAC) layer node scheduling method based on the combination of beacon frame synchronization and communication asynchronization and relates to the technical field of wireless communication. According to the method, a coordinator periodically sends beacon frames to nodes and establishes a novel superframe and entire network synchronization, in the novel superframe period, each node is switched between sleeping / listening states in different periods respectively, and the coordinator and the nodes perform data communication and control transceiving of command frames in an asynchronous wake-up mode. The method is applicable to intelligent meter reading and intelligent housing system based on wireless sensor network. By means of the method, when the wireless sensor network is applied to a real-time monitoring scene in which the communication times are few, the data flow is low and the network size is small, the network communication and control energy consumption is reduced, the communication conflict rate is lowered, and the management capability of the network to the nodes is improved.

Description

technical field [0001] The invention relates to the field of wireless communication technology, and specifically provides a MAC layer node suitable for a wireless sensor network system with small network scale, infrequent communication times, small data volume, mainly downlink data, and differences in the functions of different nodes. Scheduling method. Background technique [0002] As is generally known in the art, the coordinator in a wireless sensor network is connected to each node in a wireless manner, and the same channel access and node scheduling strategy is used between network devices (ie, the coordinator and nodes) to achieve multiple Nodes share wireless communication resources. The scheduling strategy is determined by the medium access control layer (medium access control, MAC) at the bottom of the wireless sensor network protocol; in the specific implementation process of the protocol, the coordinator plays a major role. [0003] Generally speaking, to measur...

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Problems solved by technology

[0031] The purpose of the present invention is to overcome the existing asynchronous and synchronous MAC protocols that are difficult to achieve low energy consumption and low energy consumption in wireless sensor networks with small network scale, infrequent communication times, small data volume and differences in the functions of different nodes. Delay and low channel usage efficiency, etc., so a MAC layer node scheduling method based on beacon frame synchronization and communication asynchrony is proposed

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