Adaptive carrier sense multiple access (CSMA)/conditional access (CA) method based on institute of electrical and electronics engineers (IEEE)802.15.4

Abstract

The invention relates to a carrier sense multiple access (CSMA) / conditional access (CA) mechanism optimization method in a new institute of electrical and electronics engineers (IEEE)802.15.4 standard. An analysis stage, a determination stage and an execution stage are involved. An initial value of macMinBE in the CSMA / CA is retained, but the backoff index macMinBE is dynamically adjusted according to contention network flow of each node in a certain number of beacon frame intervals, so that a proper backoff range can be dynamically selected by a sensor node according to the condition of a network. Due to optimization, macMinBE can reflect the current network condition accurately, and network use rights among the nodes are balanced. Therefore, the network justice of the nodes is improved, the network throughput is increased, and the network load is reduced. A simulation result shows that: compared with the conventional binary exponential backoff (BEB) algorithm in the IEEE802.15.4, the optimization method for a BEB algorithm with adaptive adjustment capacity has the advantage that under the condition that the network input service amount is relatively large, the network throughput is increased obviously, and the network working load is reduced.

Description

Technical field [0001] The invention relates to a wireless sensor network media access control (MAC, Media Access Control) sub-layer processing technology, in particular to a new CSMA / CA access mechanism optimization method in the IEEE802.15.4 standard. Background technique [0002] Wireless Sensor Network (WSN, Wireless Sensor Network) is a data-centric network. A large number of sensor nodes with wireless communication and data processing capabilities form a wireless network in a self-organizing or multi-hop manner. Nodes collect and process data through sensors and feed back to users. [0003] The IEEE802.15.4 standard is mainly aimed at low-speed, low-power, low-cost low-speed wireless personal area network (LR-WPAN, Low Rate-Wireless Personal Area Network), which defines the protocol of the physical layer and the data link layer. It is very suitable for WSN. At present, many WSN researches are based on this protocol standard. The IEEE802.15.4 protocol provides two working mo...

AI Technical Summary

Problems solved by technology

When the next algorithm starts, BE restores the default value, and the nodes are very likely to collide again and retransmit data packets until BE reaches a higher value again, thus wasting a lot of time and channel resources

Causes the throughput of the network to drop, prone to message collisions, message delays, etc., and increases the network load

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