Method of multirate self-adaptation back-off of wireless sensor network

Abstract

The invention discloses a method of multirate self-adaptation back-off of a wireless sensor network. The method particularly comprises that a node is started and a radio frequency module is arranged to work at maximum transmitting power; the node sends broadcast data packets at different speeds, and receives the response data packet of adjacent nodes; the node measures and records direct communicating time with other nodes at different speeds, and sends the time information to the adjacent nodes; the node counts the received response data packets, and confirms a degree number (the number of the adjacent nodes); the node receives the data packets containing the direct communicating time among the nodes sent by the adjacent nodes, and confirms a connection set (the connecting set of a node is a set formed by the adjacent nodes, and the direct communicating time between the node and the adjacent nodes is less than the indirect communicating time between the node and the adjacent nodes.); the node confirms an optimal back-off factor according to the relation of the degree number and the connection set; the node confirms self-adaptation coefficient reflecting network congestion conditions; and the node monitors the data sending conditions on a channel, carries out real-time adjustment according to the size of a contention window to enable the contention window of the node to reasonably reflect the contention conditions of the channel. The method of the multirate self-adaptation back-off of the wireless sensor network is suitable for the field of wireless sensor networks, a physical layer provides multirate abilities, the problems that data collision is increased and a contention window value is always large due to multirate transmission are solved, network throughput can be improved remarkably, and transmission delay can be reduced.

Description

technical field [0001] The invention relates to the technical field of wireless sensor networks with multi-rate capabilities provided by the physical layer, solves the problems of increased data conflicts and always large contention window values ​​caused by multi-rate transmission, and can significantly improve network throughput and reduce transmission delay. In particular, a multi-rate adaptive backoff method for wireless sensor networks. Background technique [0002] In wireless sensor networks, shared channels are very limited resources, so an effective MAC (Medium Access Control) protocol is of great significance to wireless sensor networks. Due to the particularity of wireless sensor networks, the centered channel access technology used in cellular mobile communication systems and the traditional channel access technology based on shared broadcast channels cannot be directly transplanted into wireless sensor networks. IEEE 802.11 MAC protocol DFWMAC (Distributed Foun...

AI Technical Summary

Problems solved by technology

[0009] To sum up, there are still few research results on backoff strategies when wireless sensor network nodes support multi-rate transmission capabilities, and how to avoid additional overhead, reduce network delay and improve network throughput needs to be solved urgently.

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