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本文提出并验证了一种用于收集时限约束数据的卫星通信网多址协议——广播查询时分发送多址协议(BPMA)。该协议综合了传统的时分复用(TDM)和查询(Polling)两种多址技术的特点,在缩短系统工作期和采集站能源消耗时间,以及简化通信控制设备方面,发挥出突出的优越性。对于在数据子站数量多、分布面积广、数据时效短、可租用的线路速率低、建站条件差等工作环境中使用的卫星数据收集系统,本协议具有明显的适用性。文中对协议模型、原理和控制算法作了描述;对应用系统的性能采用随机模拟方法作了详细调查;提供大量统计数据供设计系统时参考。
This paper presents and verifies a satellite communication network multiple access protocol - Broadcast Query Time Division Multiple Access Protocol (BPMA) for collecting time-bound data. The protocol combines the features of both traditional time division multiplexing (TDM) and polling (multiple access) technologies to give prominence to the need to reduce system uptime and energy consumption at acquisition stations, and to simplify communications control equipment . This protocol has obvious applicability to satellite data collection system used in work environment such as large number of data substations, wide distribution area, short data aging, low leased line rate and poor construction site conditions. In this paper, the protocol model, principle and control algorithm are described. The performance of the application system is investigated by stochastic simulation method. A large number of statistical data are provided for the design of the system.