面向低功耗无线网络无协调并发介质访问关键技术研究

本项目通过设计唤醒前导帧机制向接收节点预约数据转发服务，也为载波侦听范围内的其它发送节点提供了及时有效的信道传输状况反馈机制，研究适用于低功耗节点的实时信道状态检测方法和信道访问可行性评估策略，最终实现低功耗无线网络无协调并发介质访问控制，解决现有低功耗无线网络信道访问效率低的问题，并进一步结合数据传输协议相关性能的优化方法，从根本上解决现有低功耗无线网络数据传输协议的性能瓶颈，实现低功耗无线网络无调度并发传输的目标。

This program proposes a generic concurrent low power listening mechanism supporting concurrent and conflict-free data transmission service for multiple senders. The basic idea is that rather than continuously and repeatedly transmitting the same data frame, a sender completes a data transmission by periodically alternating a data frame and a series of intentionally constructed wakeup preamble frames. The series of wakeup preamble frames are designed to rendezvous with receiver’s waking moment and transmitted by setting a well-designed low output power so that they won’t interfere neighbors’ data frame transmission. On that basis, as new sender, if the captured channel state indicates the channel is free or only used for the transmission of wakeup preamble frames, it immediately schedules data frame transmission over the free channel or overlapping with the identified wakeup preamble signals, rather than repeating the same carrier sense-defer process. In this way, this program can easily realize concurrent data transmission for multiple neighboring senders without compensating with any other performance indicators.