无线局域网中时延感知的电源管理策略

Delay Aware Power Management Scheme for WLANs

因为移动需求,无线局域网的节点大多采用电池供电,节能对延长节点的工作时间极为重要。IEEE 802.11标准提出了电源管理策略,即允许无数据传递任务的节点进入休眠模式以节省能耗。对上述策略进行建模与分析,导出了数据包传递时延、节点的连续休眠次数、活跃时间以及节点在活跃与休眠模式之间的切换次数等指标,提出了适用于IEEE 802.11基础设施无线局域网的时延感知的电源管理策略并对之进行数值分析,这种方案可以让节点寻找到最优的休眠时间长度以使能耗最低且满足给定的时延约束。

Most nodes in a wireless local area networks（WLAN） are powered by battery due to mobility requirement.Power conservation is significant for the nodes to prolong their run-time.Power management（PM） is presented in the IEEE 802.11 standard,which allows nodes to enter dozing mode to save power when they are not engaged in data deli-very.The PM was modeled and analyzed so that the packet delay,the number of successive dozes,the active time,and the number of switches between active and doze modes were all derived.A delay aware power management（DAPM） scheme,which is suitable for IEEE 802.11 infrastructure WLANs,was proposed and analyzed.The DAPM was able to help nodes seek the optimal dozing period so that the power consumption is minimized while the given delay requirement is met.