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1.引言便携式无线电话可以在各种场合将信息传到单独用户。为实现这种无线电话系统,在一个传输网内(例如电缆网)需要连接许多固定台,固定台的作用是担任无线电话与传输网之间的转换。在本系统中,固定台的任务是分配空闲的双工信道给有限区域内的用户且建立传输网的联系。由于用户的电话与传输网建立了联系。这样,固定台起了转接无线电话的作用,因此,在传输网中可以采用中继方式。
1. Introduction Portable radiotelephones can send information to individual users on a variety of occasions. In order to realize such a radiotelephone system, it is necessary to connect many fixed stations within a transmission network (for example, a cable network), and the fixed station serves as a transition between the radiotelephone and the transmission network. In this system, the task of the fixed station is to allocate idle duplex channels to users in a limited area and to establish a connection to the transport network. Since the user’s phone and the transmission network has established contact. In this way, the fixed station plays the role of transferring radiotelephone, therefore, the transport network can be used in the relay mode.