Aiming at the low power consumption,bluetooth low energy(BLE)connection delay,and narrow band internet of things(NB-IoT)downlink traffic response delay requirements for NB-IoT and BLE dual-mode single-standby terminals,a terminal communication control method based on semi-Markov chain is proposed to enhance the comprehensive performance of the terminal.By integrating the extended idle mode discontinuous reception(eDRX)and power saving mode(PSM)of NB-IoT,where radio frequency is exclusively dedicated to BLE in PSM,a semi-Markov chain model for terminal communication state transition is constructed.This model is used to derive the power saving rate and the calculation model for the average NB-IoT downlink delay.Based on the delay requirements of BLE connection and NB-IoT downlink traffic,and combined with NB-IoT real-time traffic data,the critical parameters of eDRX are dynamically calculated.Subsequently,the terminal optimal comprehensive performance is achieved through optimizing BLE broadcast duration.Experimental results show that the proposed method achieves a power saving ratio exceeding 0.96 in low-power demand scenarios.Furthermore,in low-delay demand scenarios,the average downlink traffic response delay is less than 10 seconds.This method satisfies the communication delay requirement and reduces the communication power consumption of the terminal.
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