| 摘要 |
A system for providing roaming service in a telecommunications system that is partially enabled for local number portability (LNP). A new LNP protocol element is defined for registration notification messages. A roaming cellular mobile radiotelephone (CMR) transmits its mobile identification number (MIN) in a registration request, which is received by a host mobile switching center (MSC). The first six digits of the CMR's MIN uniquely identifies the CMR's home MSC. The host MSC validates the roaming CMR by sending a registration notification message, including the CMR's MIN, to the CMR's home location register (HLR), which is maintained at the CMR's home MSC or at a clearinghouse. If the host MSC is LNP enabled, it sets the LNP protocol element in the registration notification message. If the host MSC has not been upgraded for LNP, it will not be configured to set the LNP protocol element in the registration notification message. Upon receiving the registration notification message, the CMR's HLR checks the LNP protocol element to determine whether the host MSC is LNP enabled. If the host MSC is LNP enabled, the CMR's HLR returns a validation response message to the host MSC authorizing the CMR for automatic roaming service. If the host MSC is not LNP enabled, the CMR's HLR returns a validation response message to the host MSC authorizing the CMR for restricted roaming service.
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