A multi-channel communication method for wireless sensor network

Abstract

The present invention provides a multi-channel communication method for a wireless sensor network, which adopts the method of selecting and switching the control channel by the sending node. When sending data, if the sending node fails to send data for many times in a row, it returns to the control channel and replaces the next The data channel of secondary communication, when the sending node selects the next hop node, if the link quality between the sending node and all neighboring nodes cannot meet the requirements, the sending node will change the data channel. The sending node only needs to coordinate channel switching with neighboring nodes, without complex network-wide or sub-network synchronization mechanisms. By combining with the routing mechanism of the network layer, unnecessary channel replacement can be reduced, and only a small amount of modification to the existing system is required. The modification can realize multi-channel communication; when the sending node and / or receiving node are interfered, it can improve the packet receiving rate and reduce the delay, which is beneficial to reduce energy consumption and prolong the network survival time.

Description

technical field [0001] The invention relates to the technical field of wireless sensor network communication, in particular to a multi-channel communication method of a wireless sensor network. Background technique [0002] Wireless sensor networks are being used more and more widely. According to relevant standards, wireless sensor networks use ISM frequency bands that do not require registration. Among them, the 2.4GHz frequency band is a relatively commonly used ISM frequency band. There are various wireless communication systems in this frequency band, including wireless local area networks. , cordless phone and bluetooth etc. WLAN has a large coverage area and high communication volume, which will cause significant interference to adjacent communication systems. [0003] In order to reduce the impact of WLAN interference, a variety of anti-interference communication methods have been proposed in the field of wireless sensor networks, such as channel coding, multi-chann...

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Problems solved by technology

[0005] The basic requirement for channel selection is to avoid the channel interfered with at the sending end and the channel interfered with at the receiving end at the time of transmission. The interference of wireless local area network to wireless sensor network has a significant location correlation. With many WLAN routers or access point devices, it is difficult to select a common idle channel for all nodes in the network, subnet, or transmission path

The interference of the wireless local area network also has the characteristics of random changes, and the method of static allocation (such as the literature [3] "Channel allocation strategies for wireless sensors statically deployed in multipath environments. In: Proceedings of the 5th international conference on Information processing in sensor networks, 2006") It is only suitable for the situation where the interference model is known; the method of interference detection or prediction channel selection (such as literature [2] and literature [4] "Distributed cognitive coexistence of 802.15.4 with 802.11.In: Proceedings of the 1st International Conference on Cognitive Radio Oriented WirelessNetworks and Communications, 2006") can effectively avoid interference, but correspondingly increase the overhead of storage and running time

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