移动无线个人区域网络中MAC协议分析研究

Research of the Mobile MAC Protocol about Wireless Personal Area Network

在分层移动节点的无线传感器网络中,网络的信息采集常常具有突发性和集中性。对低速无线个人区域网络IEEE802.15.4 MAC进行研究,针对采用直接数据传输的CSMA-CA机制在用户发送查询指令时,路由节点附近的传感器节点几乎同时进行数据采集和汇报,造成在传感器节点汇报数据时期出现大量的数据碰撞,导致传感器节点能量的大量损耗的问题,提出了一种基于IEEE802.15.4的能量高效的移动MAC协议。该协议采用带时隙的CSMA-CA机制,将超帧激活期划分成竞争期与非竞争期。竞争期内,传感器节点申请数据收发安排权,非竞争内进行无竞争的数据传输,减少了数据碰撞的概率,仿真实验表明基于IEEE802.15.4的能量高效的移动MAC协议具有能量高效性。

In hierarchical architecture for wireless sensor network with the mobile nodes, network information collected often has the sudden and concentration. IEEE802.15.4 MAC protocol is introduced In this paper .When the users send queries in their command, the sensor nodes near routing node almost simultaneously collect and report the sensing data, which will result in a large number of data crash and energy loss. To address this issue, we propose an energy-efficient mobile MAC protocol which is based on IEEE802.15.4. This protocol use CSMA-CA mechanism with the time slot to divide the super frame into the competition period and free period. In competition period, the sensor node arrangement to apply the right to send and receive data, while transmitting data using the form of competition-free in free period, which will reduce the probability of data collision. The simulation results show that our MAC protocol has a high per- formance.