摘要
在基于喷泉码的代码分发协议中,通过设置冗余分组提高解码成功率.本文研究了最优分块冗余长度选取的问题,理论分析和实验结果表明,满足最小通信量条件的最优分块冗余长度与分组丢失率有关.在典型的室内干扰条件下,最优分块冗余长度与分组丢失率呈正相关性,当分组丢失率上升时,增大分块冗余长度能减小数据通信量.在以CC2430为核心的平台上实现了基于喷泉码的代码分发协议及其改进版本,在改进版本中加入了自适应调整分块冗余长度的机制,在实际环境中对改进的代码分发协议进行了性能评估实验,实验结果显示,与现有协议相比,通过动态调整分块冗余长度能减少约15.3%的通信量,分发时间也明显缩短,从而有利于延长无线传感器网络的生存期.
Redundant packets are used to increase the possibility of successful decoding in fountain-code based code dissemination protocols.The problem on the selection of the optimal block redundancy length was investigated.Theoretical analysis and experimental results show that the optimal block redundancy length which meets the minimum traffic condition is related to packet loss rate.Under typical indoor interference conditions,the optimal block redundancy length is positively correlated with the packet loss rate.When the packet loss rate increases,increasing the block redundancy length can reduce traffic.The fountain-code based code dissemination protocol and its improved version were implemented on a platform with CC2430 as the core.A mechanism for adaptively adjusting the block redundancy length was added to the improved version.A series of performance evaluation experiments were carried out in the actual environment.The experimental results show that,with the aid of dynamically adjusting the block redundancy length the overall traffic can be reduced by about 15.3%,and the dissemination time is also significantly shortened,which will help to prolong the lifetime of wireless sensor networks.
作者
王宇波
施伟斌
和梦琪
乐燕芬
WANG Yu-bo;SHI Wei-bin;HE Meng-qi;LE Yan-fen(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《小型微型计算机系统》
CSCD
北大核心
2022年第4期801-806,共6页
Journal of Chinese Computer Systems
基金
国防基础研究项目(JCKY2019413D001)资助
国家自然科学基金项目(61374040)资助
上海理工大学科技发展项目(2020KJFZ082)资助。
关键词
无线传感器网络
代码分发协议
分块冗余长度
喷泉码
wireless sensor network
code dissemination protocol
optimal block redundancy length
fountain codes
