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针对无线传感器网络中无线链路质量差异性和动态变化的问题和资源受限的特点,在无线传感器网络中使用交替重传的混合自动请求重传(hybrid ARQ,HARQ)方案实现自适应差错控制.该方案发送端使用1/2码率的纠错码来对数据编码,将码字的信息位和校验位分成2个数据包并交替传输,接收端由单个正确接收的数据包或者合并2个出错的数据包译码恢复原始数据.结合IEEE802.15.4标准规范和主流传感器节点平台参数,对ARQ协议和交替重传HARQ方案的能量效率、平均传输次数和传输成功率进行理论分析和仿真比较.结果表明,交替重传HARQ方案的性能明显优于ARQ技术.
In order to solve the problem of wireless network quality difference and dynamic change in wireless sensor networks and the limited resources, HARQ (Hybrid Automatic Repeat reQuest) is applied in wireless sensor networks to realize adaptive error control . The sender of the scheme uses 1/2 code error correction code to encode the data, divides the information bit and parity of the code word into two data packets and transmits alternately, and the receiving end consists of a single correctly received data packet or a combination 2 erroneous data packets are decoded to restore the original data.According to the IEEE802.15.4 standard and the parameters of the mainstream sensor node platform, the energy efficiency, average number of transmissions and transmission success rate of the ARQ protocol and the alternate retransmission HARQ scheme are theoretically analyzed and simulated The results show that the performance of alternate retransmission HARQ scheme is obviously better than ARQ technology.