三、蜂窝式移动电话的通话过程前面三讲叙述了蜂窝式移动电话的基本原理、网络构架及各种制式的概况。但移动电话通话链路建立的过程仍不像我们所熟悉的有线公共电话那般明晰。它的信令复杂程度及所要实时处理的细节问题毕竟比有线公共电话涉及面更广。为便于读者理解和掌握,我们以下比照有线公共电话的通信 Third, the cellular mobile phone calls The previous three talked about the basic principles of cellular mobile phones, network architecture and a variety of standard profiles. However, the process of establishing a mobile phone call link is not as clear as the wired public telephone we are familiar with. Its signaling complexity and the details to be dealt with in real time are, after all, broader than wired public telephony. In order to facilitate the reader to understand and grasp, we are following the wired public telephone communication