Implementation of High Channel Utilization H-mac Protocol for Wireless Sensor Networks

Abstract

The invention provides an implementation method for a high channel utilization H-MAC protocol of a wireless sensor network. The H-MAC protocol takes a longest time TS1 of a continuously sending short preamble of a node as a time interval and divides the time interval into a continuously circulating preamble part and a precontract part. The implementation method has the advantages that the H-MAC protocol adopts a novel channel competition mechanism combining a low-power listening technique (LPL) with a random backoff mechanism to improve the channel utilization; a work schedule of the node is determined through a random wakening mechanism to decrease the probability of data collision; a wakening moment prediction mechanism is adopted to predict a wakening moment of a destination node to decrease the idle listening time of the node.

Description

technical field [0001] The invention relates to communication technology, in particular to the realization method of H-MAC protocol for high channel utilization rate of wireless sensor network. Background technique [0002] Wireless sensor network (Wireless Sensor Network, WSN) is a multi-hop self-organizing network system composed of sensor nodes, which is widely used in military, intelligent transportation, environmental monitoring, medical and health and other fields [1]. The channel access protocol (Media Access Control, MAC) controls the work of the communication module and has a decisive impact on the upper layer protocol. Therefore, optimizing the work of the communication module by improving the MAC protocol is a better way to improve the performance of the WSN network. [0003] According to the requirements of the protocol on the clock, the MAC protocol can be divided into synchronous and asynchronous. Synchronous MAC protocols require a certain degree of time sync...

AI Technical Summary

Problems solved by technology

To solve the problem of fixed B-MAC preamble length, X-MAC modifies the long preamble of B-MAC into a series of short preambles with fixed gaps, and further reduces the length of the preamble by using the method that the receiving node actively sends ACK in advance for data exchange. X-MAC significantly reduces the length of the preamble, and its transmission performance is better than that of B-MAC through simulation verification. However, when the network traffic is large, the channel utilization of X-MAC is low.

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