| 摘要 |
A network broadcasts a list of multiple core networks. A mobile station MS selects one and sends an uplink message (e.g., ATTACH or ROUTING AREA UPDATE Request) with a format containing a data section and an identity section to a base station. The identity section comprises: a temporary identifier for a mobile station, a bit sequence indicating that a selected core network is identified in the uplink message and indicating type for the temporary identifier (e.g., Foreign or random Temporary Logical Link Identifier TLLI), and an indication of the selected core network. For the Foreign TLLI there is an extension field for the additional bits of the Foreign TLLI as compared to the Random TLLI, and the Foreign TLLI is derived from the MS's Packet Temporary Mobile Subscriber Identity PTMSI. By including the selected core network within the uplink message, the base station is able to contact the desired network.
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