An Adaptive Energy Saving Mechanism in the Wireless Packet Access Network

The energy saving mechanism is very important for supporting the mobility and extending the battery life in the wireless packet access network. For example, the sleep-mode has been standardized in both IEEE 802.16e and 3G long term evolution (LTE) systems. According to the definition in the standards, an adaptive energy saving mechanism (AESM) for enhancing the standardized energy saving mechanism (ESM) is proposed, in which the sleep interval is determined by both the system load and traffic properties. The proposed AESM determines the initial sleep interval and the period sleep interval adaptively according to the proposed parameters gamma and Psi, which are the multiplying step size of the sleep interval and the traffic´s property respectively. In order to demonstrate the proposal validity, the theoretical analysis based on the Markov chain model is presented, and the total energy consumption for the heavy load and the light load is compared. Simulation results illustrate that the proposed scheme can achieve a good balance between the energy saving efficiency and the transmission response time delay.