Abstract
Abstract In recent years, cellular communication systems have extremely important technique of the applications in twenty-one century. With the advance of the mobile communicational technique, the cellular system of the third generation has been used generally. We also know that trunked radio system get a nice property of having a good sharing ability of spectrum. A trunked radio system is different from cellular communications in that the primary service is this half-duplex one-to-many group dispatch. There are good reasons for thinking that trunked mobile radio services in the cell structure. In this thesis, we are concerned with the relationship between the number of up-link channels, down-link channels, and the number of groups in the trunked radio system. The results are used to support the design of trunked radio systems before they are constructed.