1 1 无线抄表系统总体设计方案 Version 2.0

上海XX信息技术开发中心 版权所有 2 2 序言 .................................................................................................................................................. 4 1 术语定义 ................................................................................................................................... 5 2 适用范围 ................................................................................................................................... 5 3 系统组成 ................................................................................................................................... 6 4 网络结构 ................................................................................................................................... 6 5 协议模型 ................................................................................................................................... 7 5.1 硬件层 ........................................................................................... 错误!未定义书签。 5.2 数据连接子层 ............................................................................... 错误!未定义书签。 5.3 Broadcast广播 .............................................................................................................. 8 5.3.1 Package Identity field ........................................................................................ 9 5.3.2 Command Type field ......................................................................................... 9 5.3.3 Group ID field ................................................................................................. 10 5.3.4 Source ID field ................................................................................................ 10 5.3.5 Target ID field ................................................................................................. 10 5.3.6 Command Code field ...................................................................................... 10 5.3.7 CRC field ........................................................................................................ 11 5.4 数据包 ......................................................................................................................... 11 5.4.1 Package Identify field ..................................................................................... 11 5.4.2 Group ID field ................................................................................................. 11 5.4.3 Source ID field ................................................................................................ 11 5.4.4 Target ID field ................................................................................................. 11 5.4.5 Data Length field ............................................................................................. 12 5.4.6 Data field ......................................................................................................... 12 5.4.7 CRC field ........................................................................................................ 12 5.5 Response回复 ............................................................................................................ 12 5.5.1 Package Type field .......................................................................................... 12 5.5.2 Group ID field ................................................................................................. 13 5.5.3 Source ID field ................................................................................................ 13 5.5.4 Target ID field ................................................................................................. 13 5.5.5 Data Length field ............................................................................................. 13 5.5.6 Data field ......................................................................................................... 13 5.5.7 CRC field ........................................................................................................ 13 5.6 链路管理 ..................................................................................................................... 14 5.7 MAC子层................................................................................................................... 14 5.7.1 CSMA ............................................................................................................. 14 5.7.2 监听算法 ......................................................................................................... 15 5.7.3 CSMA-CA ...................................................................................................... 15 5.8 网络路由 ..................................................................................................................... 16 6 网络拓扑发现 ......................................................................................................................... 16 6.1 一对多 ......................................................................................................................... 17 6.1.1 建立链路 ......................................................................................................... 17 6.1.2 防碰撞 ............................................................................................................. 18 6.2 ad-hoc .......................................................................................................................... 19