基于延时容忍任务的Wi-Fi低功耗方法

Low-Power Approach for Wi-Fi Based on Delay Tolerant Task

针对Wi-Fi接口长时间保持活动(ACTIVE)状态导致电池电量快速消耗的不足,对数据传输模式和延时容忍任务进行分析并提出一种基于延时容忍任务的无线网络接口低功耗管理方法.该方法采用延时策略,通过检查无线网络接口状态,推迟发送延时容忍任务的非实时数据,延长空闲(IDLE)状态时间,保证数据在ACTIVE状态批量传输,同时设置最大等待时间阈值以在确保用户体验质量的前提下使得数据传输的总能耗减少.实验结果表明:与未应用延时策略相比,延时策略降低了4.5%的数据传输能耗.

In order to overcome the high-power consumption of the Wi-Fi network interface when the port always stays in an ACTIVE state,the data transmission pattern is analyzed and a low-power management approach for wireless network interface based on delay tolerant task is proposed.The delay policy is adopted to check the network port of Wi-Fi and to delay transmitting non-real-time data of delay tolerant application,prolong the IDLE state interval,and ensure the batch data transmission in ACTIVE power state.Meanwhile,by considering the quality of user experience,delay policy reduces the total energy consumption of data transmission according to the maximum waiting time threshold.The experimental results show that,compared with no-delay policy applied to data transmission,delay policy is able to reduce transmission energy consumption by 4.5%.