Patent ID: 6950419
Filing Date: 2005-09-27
Classification: H04L,H04Q

Abstract:
1. A method for transmitting a message between an asynchronous mobile communication system and a core network, the asynchronous mobile communication system having a mobile station and a radio network, the method comprising the steps of: a) at the radio network, generating and transmitting a system information message having information related to least one core network that is interconnected to the asynchronous mobile communication system, wherein the information includes core network operating type information indicative of an operating type of the at least one core network, a public land mobile network (PLMN) identity and a minimum protocol revision; b) at the mobile station, identifying a number of operating types of the at least one core network based on the system information message; c) at the mobile station, if it is determined from the number of operating types that there is only one core network interconnected to the asynchronous mobile communication system, operating a call control entity and a mobility management entity according to the identified operating type of the core network; d) at the mobile station, if it is determined that from the number of operating types that there are two or more core networks interconnected to the asynchronous mobile communication system, selecting one of the two or more core networks based on the system information message and a PLMN identity and a mobile protocol revision stored in the mobile station, operating a call control entity and a mobility management entity according to the identified operating type of the selected core network, and d) informing the radio network of information related to the selected core network, wherein the step of selecting includes comparing the PLMN identity and the minimum protocol revision in the system information message with the PLMN identity and the mobile protocol revision stored in the mobile station respectively; and e) communicating messages between the mobile station and the radio network, the messages having a data format adapted to the identified operating type of the core network.