A multi-channel csma / ca access mechanism combined with martingale theory in industrial internet

Abstract

The application belongs to the technical field of wireless access network, and particularly relates to a multi-channel CSMA / CA access mechanism combining martingale in an industrial internet; the application equates the access process of the multi-channel CSMA / CA to a Markov chain, constructs a service martingale for the transition probability matrix thereof, combines an arrival martingale, and then deduces a formula to overcome randomness and further estimate a time delay; the new mechanism adopts an access mode of occupying channels of common terminals by low-time-delay terminals and grouping terminals with different time delay requirements and competing in groups according to the number of terminals with different time delay requirements and the packet sending frequency thereof, so that the time delay of other common terminals is not affected while meeting the ultra-low time delay requirement of part of terminals in the system; the industrial internet can work under the same base station while retaining the large-scale terminal access advantage supported by the CSMA / CA, the time delay of the industrial internet with individualized requirements is guaranteed, and the applicability of the application is greatly increased.

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