Method for competing access period multilevel collocation of distributed wireless sensor network

Abstract

The invention relates to a process for accessing a distributed-type wireless transducer in a cycle multi-stage configuration, which is suitable for a series of novel distributed-type wireless transducer network such as environmental monitoring, military, national defence, industrial and agricultural production, city administration and the like. The method comprises dividing competitive access period in superframe to be several little second-grade competitive access period time slot, namely guaranteed competitive access periodic time (GCAP, Guaranteed CAP), and allocating a GCAP for each equipment for sending beacon. Every apparatus does not try a competitive access channel in self GCAP period, but opens self receiver as a coordinator in a star-shaped network, and the equipment waits data or data request which is sent from other equipment. During the period, data which reaches on the upper layer is put into the relative cache queue according to destination address. The invention can greatly improve energy-consumption efficiency of a system in the application occasion with small network load and low real-time request, which has very important operation significance.

Description

technical field [0001] This patent is applicable to a series of new distributed wireless sensor network applications such as environmental monitoring, military defense, industrial and agricultural production, and urban management. Especially in applications where the network load is not large and the real-time requirements are not high, it can greatly improve the energy consumption efficiency of the system, which has very important practical significance. Background technique [0002] In today's ubiquitous wireless network, many aspects of people's life have undergone great changes due to wireless communication. However, most of today's wireless networks adopt the point-to-multipoint communication mode, whether it is the base station and terminal of cellular communication, or the AP and terminal of wireless local area network. Such a communication method or topological structure is simple and reliable, but its coverage and network expansion flexibility are very limited. In ...

AI Technical Summary

Problems solved by technology

[0010] Although the superframe structure of multi-beacons can provide support for Mesh networking, there are two problems in its contention access period: "idle listening" problem and "mutual backoff" problem

[0013] The mutual backoff problem leads to frequent backoff retransmissions, which greatly affects the efficiency of data transmission, wastes network transmission bandwidth, and increases the probability of packet loss.

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