关键词: 基于冲突避免的载波侦听多路访问（CSMA/CA）协议, 时分多址（TDMA）协议, 马尔科夫模型, 时隙分配, 性能分析

Abstract: In order to evaluate the CSMA/CA performance in hybrid networks where CSMA/CA and TDMA interfere with each other, a modified two-dimensional Markov chain model is proposed by considering TDMA as periodic interference, which can be applied to calculate CSMA/CA throughput under different conditions. The analysis model validity is verified by simulation. In addition, the influence of different TDMA timeslot assignment algorithms is discussed. The simulation results show that uniform assignment can guarantee low delay and delay jitter, and uniform assignment can provide high throughput for CSMA/CA. A method combining throughput analysis model with threshold calculation based on minimum channel time demand is proposed, which can be used to select timeslot assignment algorithm under different application scenarios.

Key words: Carrier Sense Multiple Access With Collision Avoidance（CSMA/CA）, Time Division Multiple Access（TDMA）, Markov model, timeslot assignment, performance analysis