In order to explore the delay-related QoS(Quality of Service) criteria and to the delay bound and the probability of delay bound violation, a novel delay-QoS metric, time-out average stopping time, is proposed for bursty time-delay sensitive services in 5G networks. The analytical framework of mean stopping time based on martingale theory is studied. Considering the mutual effect between the power allocation and unauthorized access on average stopping time QoS, the timeout average stopping time of each terminal is investigated in ALOHA random access network. Finally, an ALOHA access algorithm with novel energy-efficient and average stopping time QoS guarantee is proposed. Simulation results demonstrate that the proposed algorithm can satisfy the constraint of the average stop time of the terminal and smooth the bursty for the delay process.

random access, martingales theory, stopping time, delay-quality of service(QoS) guarantee