LPR MAC:一种采用并行协商机制的低功耗多信道MAC协议

本文通过分析不同类型的多信道MAC协议的特点，指出了并行协商类多信道MAC协议存在的消失节点问题和通信竞争问题。针对上述问题，基于无线传感器网络节点的能量有效性，本文提出了一种新的多信道MAC协议：LPR MAC。本协议采用全网同步，时间上划分为多个时间片，节点在网络建立时随机选择某个时间片作为自己的固定接收周期，在接收周期按各自的伪随机序列在多个信道之间进行跳跃，并行协商，在其余时间片休眠。仿真结果表明，该协议减少了通信竞争程度，降低了能量消耗。

LPR MAC:A Low Power Parallel Rendezvous MAC Protocol

In this paper the characteristics of various multi channel MAC protocols are analyzed, with a focus on the disappearing node and collision problems in parallel rendezvous MAC protocols. A new multi channel MAC protocol, Low power Parallel Rendezvous Medium Access Control (LPR MAC) protocol, is proposed. The power efficiency issues in wireless sensor networks are also considered in this protocol. With this protocol, time is divided into time slots with global time synchronization, and each node randomly selects one slot as its fixed receiving slot at the period of the network established, the node listens to the channel and receives incoming packets at the receiving slot. The nodes hop according to a pseudo random hopping sequence of their choice among the available channels and parallel rendezvous, and switch to the low power sleep mode outside of their time slots. Simulation results show that this protocol can decrease the extent collision while consuming less energy per packet.