IEEE 802.16e 移動寬頻無線存取系統動態交互式省電機制

Abstract

The IEEE 802.16e Mobile Broadband Wireless Access Systems provide new infrastructure of wireless mobile communication networks. The major power supply is battery in this type of mobile wireless access devices. In order to extend the using time for these devices, we must use battery efficiently and reach the goal of power saving. A sleep mode operation for the power saving of mobile stations is defined in IEEE 802.16e standard. However, the power saving is easy to result the receiving packet delay for mobile stations. In this paper, we propose a power saving mechanism of dynamic alternately in IEEE 802.16e infrastructure. In the proposed scheme, we design new methods to calculate the sleep mode request for mobile stations in the suitable opportunity. The main goal is that the number of listening window can be reduced efficiently and then reaches the better power saving. We propose an Adaptive Alternately Sleep Interval Decision Algorithm (AASIDA) and a Dynamic Alternately Sleep Interval Schedule Algorithm (DASISA). In AASIDA, the sleep mode in sequence and the size of sleep interval are dynamic adaptive according to the packet arrival rate and the forecast deviation of packet arrival rate value. In DASISA, the sleep interval of alternate schedule is calculated, according to the arrival time of packet, time distance differ between the two packets and the packet types (Non-Real Time Data Service and Real Time Data Service). Finally, we compare our proposed two algorithms with other algorithms in the literature, the simulation results show that the AASIDA outperforms the previously scheme for packet delay and the power consumption can be maintained at an acceptable level. Also, the DASISA achieves the good efficiency of power saving and the suitable packet delay can be carried out.