Method of routing calls to portable numbers in a radio telecommu

Details Method of routing calls to portable numbers in a radio telecommu Method of routing calls to portable numbers in a radio telecommu

1998-08-26

2000-12-12

Eisenzopf, Reinhard J.

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455433, 379207, H04B 700

Patent

active

061610178

ABSTRACT:
A method of routing a call directed to a portable directory number in a radio telecommunications network having an originating mobile switching center (O-MSC), a home location register (HLR), and a Number Portability Database (NPDB). The O-MSC determines whether to send a Location Request (LOCREQ) message to the HLR for a routing number, or to send a Number Portability Request (NPREQ) message to the NPDB for a location routing number (LRN). The determination may be based on operator preference, a default preference, or statistics indicating that either the HLR or the NPDB is more likely to return a routing number. The O-MSC then attempts to obtain a routing number from the determined destination. If an error message is returned, the O-MSC attempts to obtain a routing number from the alternate destination. Upon receipt of a routing number, the O-MSC routes the call. In an alternative embodiment, the O-MSC may send the LOCREQ message and the NPREQ message simultaneously, and utilize the first routing number received to route the call.

REFERENCES:
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patent: 5717749 (1998-02-01), Sneed, Jr. et al.
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patent: 6049714 (2000-04-01), Patel
patent: 6058313 (2000-05-01), Slutsman et al.

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