Patent ID: 6992993
Filing Date: 2006-01-31
Classification: H04W

Abstract:
1. A method for cell selection of an asynchronous mobile station in an asynchronous mobile communication system including the asynchronous mobile station and an asynchronous radio network, wherein the asynchronous radio network is interlocked with a core network, the method comprising the steps of: a) storing information related to the core network transmitted from the asynchronous radio network in a memory or a user subscriber identity module (USIM) of the asynchronous mobile station before power-off of the asynchronous mobile station; b) at power-on of the asynchronous mobile station, determining what type of the core network is interlocked by analyzing information of a core network discriminator; c) beginning any one of a global system for mobile communication (GSM) cell procedure and an American national standards institute (ANSI) cell procedure; d) finding a cell suitable for providing a service, based on a type of the core network that was determined; and, performing a location registration of the mobile station according to the found cell in order to provide a service, wherein the step b) includes the steps of: b1) selecting the information of the core network discriminator having a maximum priority from a core network list which is stored in the USIM or the memory and is probable to be referred by the asynchronous mobile station; b2) determining whether the information of the core network discriminator indicates an asynchronous core network or a synchronous core network; b3) if the information of the core network discriminator indicates the asynchronous core network, selecting the PLMN ID having a maximum priority from the information related to the asynchronous core network; and b4) if the information of the core network discriminator indicates the synchronous core network, selecting a combination of a system identity (SID), a network identity (NID), a protocol revision (P