数字无绳电话PHS及其系统软件设计

Digital Cordless Telephone PHS and Its System Software Design

数字无绳电话ＰＨＳ系统是结合了最新无线访问技术和智能网络技术的新的通信服务．介绍了ＰＨＳ系统的无线访问方法ＴＤＭＡ／ＴＤ和无线通道．按照通信协议的分层，设计了相应的软件结构．在物理层，实现了基本的物理帧传输；在数据链路层，实现了滑动窗口协议的数据帧传输；在网络层，实现了无线管理、移动管理、呼叫控制等．给出了这些层的典型函数模块．应用层是由中断驱动来实现各种服务的，并按优先级来调度处理事件．ＰＨＳ具有很高的性能价格比，具有广阔的应用前景．

PHS is a new communication service that combines the latest radio access technology based on digital cordless telephony with the intelligent digital network capabilities. This article describes its radio access method TDMA/TD and radio channel. The software structure is designed according to the layers of communication protocol. In physical layer,transferring of physical frames is implemented; in data link layer, data frames are transferred based on sliding window protocol; and some management functions are implemented in network layer, such as radio management, mobility management and call control. Some main functional modules of these layers are given. Driven by interrupts,the application layer implements various services of telephone and process events according to their priority. PHS has a high ratio of performance/price,and has a good prospect.