Reliable energy efficient channel assignment in WiMAX mesh networks

The purpose of designing a reliable energy efficient communication network is to achieve a precise performance without any disruption. Energy efficiency of a mobile station (MS) is extremely important for the WiMAX (IEEE 802.16) networks. The WiMAX mesh network may use either centralized or distributed techniques for distributing resources. This paper proposes a hybrid channel allocation technique for reliable energy efficient channel assignment in multi-channel IEEE 802.16 networks (WiMAX). In the proposed scheme, each Mobile Station (MS) is equipped with multiple transceiver and can be tuned between multiple channels, to avoid any secondary interference. Initially the Mobile Subscriber Station requests for channel to the Base Station (BS) which in turn identifies the priority of the service and accordingly allocates channel and transmission power. To improve the energy efficiency the sleep time of the MS is also modified for better energy conservation. To enhance the reliability of the system in case of a channel failure, reserved slots are provided. Through simulations we demonstrate the effectiveness of the proposed method in terms of Average power Consumption, Packet delivery ratio and End to end delay.