摘要
IEEE802.15.4是供低速率、低功耗和低成本设备使用的短距离无线通信规范。低能耗设计是IEEE802.15.4研究的核心问题,也是其网络性能重要参数之一。文中对IEEE802.15.4规范中的MAC层协议和CSMA-CA算法进行深入研究,以低功耗设计为目标,引入概率机制对该MAC层协议予以改进。仿真结果表明,改进后的MAC层协议在网络负载比较高时可以减小数据包的碰撞冲突引起的丢包概率,从而提供数据包成功发送的比例,有效地提高了网络吞吐量且降低整个网络的功耗。
IEEE802 15.4 standard targets for short range wireless communication among low- rate, low- power and low- cost devices Low energy- consumption design is not only the most important problem with IEEE802.15.4 standard, but also is one of the important parameters of network performance. Study the MAC layer protocol of IEEES02.15.4 standard and csma-ca algorithm, then introduce the probability mechanism to reduce the energy - consumption. The simulation result shows that the proposed scheme can decrease the packet - loss ratio which resulted from packet collision when the network load is high, so that raise the successful send raito, significantly improve the network throughput and decrease the whole network energy- consumption.
出处
《计算机技术与发展》
2009年第12期139-142,165,共5页
Computer Technology and Development
