Adaptive Sleep Mode Mechanism for 3G WiMax Networks

The proliferation of wireless services and anytime anywhere communication providing always-on connectivity, mobile devices are getting smaller and smarter. Therefore, third-generation (3G) wireless standards IEEE 802.16e should provide very efficient energy conservation mechanisms to achieve longer battery life while providing enhanced user experience and quality of service (QoS). The emerging IEEE 802.16e standard provides a new sleep mode operation for Mobile Stations (MS) to address energy efficiency. In Sleep mode, the energy consumption of MS may be reduced by introducing a sleep cycle. However, a longer sleep cycle usually incurs higher response time. So there is a tradeoff between energy conservation and response time. Hence, we propose an Adaptive Sleep Mode Mechanism (ASMM) which adjusts an MS’s sleep cycle in an adaptive manner based on online monitoring and estimation of the traffic condition. The goal is to minimize the response time of the MS while reducing the energy consumption. The effectiveness of the proposed method is verified by simulation results.