Broadcast preamble interception based cognitive sensor network media access control method

Abstract

The invention relates to a cognitive wireless sensor network technology, and relates to a broadcast preamble interception based cognitive sensor network media access control method. Cognitive nodes ina cognitive sensor network adopt periodic dormancy-awakening mechanisms, the state of a main user can be determined by using a spectrum sensing technology, and a data sending node can build a communication link by using a broadcast preamble manner if the main user is not active. According to the order of awakening and the considering of the hop information from a gateway, each neighbor node can autonomously decide to act as a relay node to perform data forwarding. In addition, because the transmission conflict of the cognitive nodes and the main user can be caused by the regression of the main user or missed alarms, the reliability of the transmission of data packets can be guaranteed by adopting a confirmation based retransmission mechanism. The method does not depend on common control channels, so that low overhead and reliable access of cognitive sensor network on authorized frequency bands can be realized.

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 broadcast preamble interception. Background technique [0002] As an event monitoring and data acquisition technology, wireless sensor network has been widely used in environmental monitoring, military monitoring and industrial applications and other fields. With the rapid growth of wireless services, since wireless sensor network equipment and WIFI, Bluetooth, radio frequency identification RFID and other technologies also use industrial, scientific and medical frequency bands, this license-free frequency band becomes very crowded. The open and shared characteristics of wireless channels make wireless sensor network devices interfered by other technologies, which affects the performance of the network. The cognitive wireless sensor network introduces the cognitive radio technology into the wireless senso...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of control channel saturation, resource waste and increase in transmission delay caused by the sleep-wake mechanism in the opportunistic spectrum access method adopted by the traditional cognitive sensor network, the present invention proposes a cognitive sensor network based on broadcast preamble interception Medium access control method, which can realize low-overhead, high-reliability and low-latency access to authorized frequency bands in cognitive sensor networks

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