Abstract: A method for dynamically allocating a traffic channel element at an extended coverage of a base transceiver station which is divided by a cell site modem (CSM) ASIC in a mobile communication station is disclosed. In case that the call coverage is divided into a normal and an extended regions, the traffic channel element is not set to a pair of the normal and the extended channel elements. Instead, the channel allocation is dynamically allocated according to a channel type which is necessary on a call set up at each of the regions. The method reduces an unnecessary channel allocation and an occupation time of the channel elements, thereby enabling the capacity of the system to be increased.

Abstract: Disclosed is a service area expansion method and a method of processing calls between service areas in a mobile communication system adopting a CDMA system like a DCS (digital cellular system) or a PCS (personal communication system), in which a reference clock is delayed and an application specific integrated circuit (ASIC) of a plurality of CSMs (cell site modems) in a base station is controlled using such a delayed reference clock so as to expand service area by each CSM ASIC unit, and a handoff area is positioned between expanded service areas so as to perform a normal call processing. A base station of a CDMA mobile communication system is provided with a plurality of CSM ASICs having the same configuration and a delayed reference clock is fed to each CSM ASIC, thus expanding service area. Such a communication service may be provided to the coastal area where a base station is easily installed.