Performance Analysis of Sleep Mode Operation in I II 802.16m Mobile WiMAX

We mathematically analyze the sleep mode operation of I II 802.16m. The sleep mode operation for downlink traffic is modeled as a 3-dimensional discrete time Markov chain. We obtain the average power consumption of a mobile station and the average delay of a message. Numerical results match simulations very well. Numerical results show that there is a tradeoff between power consumption and message delay. We find the optimal lengths of sleep cycle and close-down time that minimize the power consumption while satisfying the quality of service (QoS) constraint on message delay. The power consumption of the sleep mode in I II 802.16m is better than that of sleep modes in legacy I II 802.16e standard under the same delay bound.