Media access control method for cognitive sensor network based on lead sensing

Abstract

The invention relates to a wireless sensor network technology, and specifically relates to an adaptive media access control method for a cognitive sensor network based on lead sensing. The method supports a sleep-wake up mechanism of cognitive sensors, and effectively solves a problem of idle sensing of the cognitive sensors and a problem of collision among the cognitive sensors by adopting a technology of combining lead sensing and carrier sensing. In addition, an adaptive sensing and duty ratio adjustment strategy is provided, and low-power-consumption running of the cognitive sensor network is realized under the premise of ensuring sufficient protection for a primary user. According to the invention, a lead sensing based adaptive media access control mechanism is defined, so that low-overhead reliable access of the cognitive sensor network for authorized frequency band can be realized without the need of a common control channel.

Description

technical field [0001] The invention relates to wireless sensor network technology, in particular to a medium access control method for a cognitive sensor network based on preamble interception. Background technique [0002] Most of the devices in wireless sensor networks work in the license-free ISM frequency band. In addition to wireless sensor networks, wireless devices working in the ISM frequency band also include microwave ovens, radio frequency identification RFID, cordless phones, and Bluetooth. The open and shared nature of the wireless channel makes the above wireless devices interfere with each other with the wireless sensor network, resulting in a significant drop in the transmission reliability of the wireless sensor network, which brings challenges to the reliable transmission of the wireless sensor network. Cognitive sensor networks integrate the concept of cognitive radio into the design of wireless sensor networks. While realizing dynamic access to licensed...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of control channel saturation, resource waste and high computational overhead in the opportunistic spectrum access method adopted by traditional cognitive sensor networks, the present invention proposes a medium access control method for cognitive sensor networks based on preamble interception. Realize low-overhead and highly reliable access to licensed frequency bands for cognitive sensor networks

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