Queuing Model-based Prediction Scheme (QMPS) for Conserving Power in BWA Networks

Abstract

Abstract: In mobile Worldwide interoperability for Microwave Access (WiMAX), a mobile node is battery powered with restricted capacity. It is challenging to prolong battery lifetime by reducing the quantity of power consumed. Power saving is a significant issue which must be taken into consideration while designing the Medium Access Control (MAC) layer. Schemes are designed for saving power based on packet delay and amount of power consumed. In this paper, Prediction Scheme based on Queuing Model (PSQM) is proposed for defining Power Saving Classes (PSCs) in the MAC layer of IEEE 802.16e networks. Power is saved by turning off Mobile Stations (MSs) when they do not actively transmit or receive data. The size of Sleep Window (SW) is dynamically determined using M/M/1/N queuing model based on channel, exponential service time and Poisson arrival. The size of the buffer is restricted and is based on the First-in First-out (FIFO) queuing model. Instead of exponentially or linearly increasing the size of SW based on traffic type, Arrival Rate (λ) is taken into consideration. Time of arrival of packets is determined, thus reducing the delay involved.

Index Terms: BWA networks, WiMAX, Power, QMPS, Arrival Rate (λ), Service Rate (µ), SW size.