Modeling and analysis for the coexistence of PSC I and PSC II in the IEEE 802.16e system

In wireless communication system, power saving mechanism is a key issue since a mobile station operates depending on limited power. Hence, the IEEE 802.16e system provides three types of power saving classes (PSC I, PSC II and PSC III) for the mobile station (MS) to reduce power consumption. Many models have been made to analyze the performance of power saving mechanism (PSM) of the IEEE 802.16e system. Although many researches have been studied about the PSC I and PSC II, no work has conducted the performance of PSM considering the coexistence of the PSC I and PSC II. Hence, in this paper, when the PSC I and PSC II are used simultaneously, we model the power saving mechanism (PSM) using a discrete-time Markov chain (DTMC) technique. We develop an analytical model considering the characteristics of the PSC I and PSC II. Using the model, we analyze the performance of the PSM by using several metrics such as power consumption and response delay. Then, by comparing numerical analysis with simulation results, we validate a proposed model.