Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1999-01-08
2001-11-20
Vo, Nguyen T. (Department: 2682)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S067150, C455S560000, C455S423000
Reexamination Certificate
active
06321087
ABSTRACT:
TECHNICAL FIELD
This invention relates to arrangements for obtaining data for calls made by a selected mobile station.
PROBLEM
Base stations and mobile switching centers of a wireless telecommunication system are arranged to detect many kinds of errors. Sometimes, these errors are detected in the middle of a call, possibly after a mobile station has been handed off one or more times from earlier base stations. Under these circumstances, there is no good way in the prior art of capturing data for earlier stages of the call from earlier base stations.
SOLUTION
Applicant has solved the above problem, and made a contribution over the prior art in accordance with this invention, wherein a call record of a call, as maintained in a base station, includes an identity of the base station which passed the call, the call record identification for that call in that base station, and optionally, the identity of the mobile switching center that controls that base station; when an error condition is discovered, the base station that controls the call at the time of the discovery thereby has a link to its predecessor base station and call record, and that base station has a similar link to its predecessor; the original base station, of course, has no indication of a predecessor; data from the predecessor call records can then be transmitted to the mobile switching center as long as the call record, which, for any predecessor station could be inactive, if the mobile has been transferred to another base station, or active, if the station still serves the mobile in a soft hand-off situation, has not yet been cleared. Advantageously, this arrangement will, under normal circumstances, (i.e., sufficient memory space for retaining call records for most of the duration of a call), allow all call record data for a call being monitored to be retrieved, even if there was no indication at the time that a base station handed off a call, that the call was going to be monitored.
REFERENCES:
patent: 5659604 (1997-08-01), Beckman
patent: 5854981 (1998-12-01), Wallstedt
patent: 5987099 (1999-11-01), O'Neill
patent: 6119005 (2000-09-01), Smolik
patent: 6119011 (2000-09-01), Borst
patent: 6128287 (2000-10-01), Freeburg
patent: 9401977 (1994-01-01), None
Lee John J.
Lucent Technologies - Inc.
Vo Nguyen T.
Werner Ulrich
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