Method and system for optimizing access to wireless sensor network channel

Abstract

The invention discloses a method for optimizing the access to a wireless sensor network channel based on a mixed MAC protocol. The mixed MAC protocol is obtained by mixing a CSMA / CA protocol and a TDMA protocol. The method for optimizing the access to the wireless sensor network channel includes the steps that firstly, sensor nodes in a wireless sensor network with high loads are divided into multiple sets; secondly, the sets have the access to the channel based on the mixed MAC protocol, wherein the sensor nodes in each set independently have the access to the channel in a CSMA / CA protocol competing manner, and the sensor nodes among the sets share and have the access to the channel in a TDMA protocol scheduling mode. In addition, the invention discloses a system for optimizing the access to the wireless sensor network channel based on the mixed MAC protocol. According to the method and system for optimizing the access to the wireless sensor network channel based on the mixed MAC protocol, the channel is used for sending data, the time delay performance of the network can be improved, the handling capacity of the network is improved, energy consumption of the sensor nodes is reduced, the access fairness is improved, and the access expansibility is improved.

Description

technical field [0001] The present invention relates to a wireless sensor network (WSN), in particular to a method for optimizing an access channel for a hybrid MAC protocol in a wireless sensor network. Background technique [0002] As the "Smart Earth" strategy is recognized by countries around the world, the Internet of Things, which is closely related to it, has become the focus of developed countries' development strategies, and WSN, as an indispensable part of the Internet of Things, is playing an increasingly important role. Role. [0003] Such as figure 1 The WSN architecture shown is mainly composed of sensor nodes, aggregation nodes, and users. Wherein, the wireless sensor node includes: a data acquisition module, a data processing module, a wireless transceiver module and a power management module. The data acquisition module is set to collect physical quantities in nature and perform A / D conversion, and then send them to the processor through the I / O interface...

AI Technical Summary

Problems solved by technology

[0005] The CSMA / CA protocol is a wireless sensor network MAC protocol based on a "competition" method for independently accessing channels. Specifically, it adopts the method of "using channels on demand". , resend the data until the data is successfully sent or give up sending, but in the case of high load, in order to avoid collision, the protocol can only waste the time slot of the access channel, which inevitably makes the delay performance of network nodes , The throughput will drop sharply, the time will be extended and the scalability will be poor

[0006] The TDMA protocol is based on the "scheduling" method to allocate a certain channel resource for each sensor node, so that when the node needs to send data, it can be free from interference, so that each node has absolute "fairness" and the same "delay", but Since each node occupies a different time slot, if the node does not send data in the time slot, the time slot will be wasted, and for the newly joined node, the data cannot be transmitted because the time slot is not allocated, so , network throughput is limited, time extension and poor scalability

Images