利用即時操作系統之IS-54呼叫處理實作

Abstract

在本論文中，提出一個符合北美數位蜂巢式系統IS-54標準的手機呼叫處 理(call processing)製作。呼叫處理是負責處理手機(mobile phone)與 基地臺(base station)之間行為的通訊協定。而這些行為必須符合IS-54 標準的規格，如此一來，手機與基地臺才能利用共用的介質(空氣)與有限 的資源(頻寬)來互相溝通。首先，由對手機的分析可知其是個即時系統。 接著，為了完成這個即時系統，針對即時操作系統做了一些討論，並選擇 了在Intel x86系列個人電腦上執行uC/OS為我們的實作平臺。最後，提出 一個設計方法關於如何運用即時操作系統來完成IS-54呼叫處理。此外， 有關變數處理與finite state machine的自動生成工具，在IS-54呼叫處 理的製作上亦增加了些許的便利。目前呼叫處理可以處理類比控制通道( analog control channel)的註冊(registration)，呼叫回應(page response)以及撥號(origination)的動作。運用這個設計方法以及自動化 的工具。當數位傳輸通道(digital traffic channel)完成後，我們將可 以完成一個完整的IS-54呼叫處理。 In this thesis, an implementation of the call processing for the IS-54 North American Digital Cellular (NADC) mobile phone system is presented.Call processing is a protocol which deals with the behavior between mobile phones and base stations. This behavior should satisfies the specification in the IS-54 standard so that every mobile phones and base stations can communicate through the common media, air, and the limited resource, bandwidth. First, an analysis of mobile phones shows that the mobile phone is a real time system. Second, in order to implement this real time system, a discuss about real time OS (RTOS) is described and the mC/OS running on a Intel x86 PC is the platform we choose. Third, a design method about how the use the RTOS to implement the IS-54 call processing is presented. In addition, automation tools about variable manipulations and generating a finite state machine also increase the facilities of implementing the IS-54 call processing.Now, the call processing can handle the registration, page response and origination in the analog control channel. The design method and the automation tools make it possible to implement a complete IS-54 mobile phone call processing while the hardware devices for the digital traffic channel are ready.