Telecommunications – Carrier wave repeater or relay system – Monitoring
Reexamination Certificate
1999-01-08
2001-07-17
Maung, Nay (Department: 2681)
Telecommunications
Carrier wave repeater or relay system
Monitoring
C455S067150, C455S436000, C455S560000
Reexamination Certificate
active
06263187
ABSTRACT:
TECHNICAL FIELD
This invention relates to arrangements for obtaining data for calls made by a selected mobile station.
1. Problem
The control of a cellular mobile switching system is necessarily highly distributed between a centralized mobile switching center and a plurality of base stations, each for communicating with mobile stations in a surrounding area (cell). Tracking down software problems, or problems associated with incorrect data at a base station, is particularly difficult in such a distributed system, wherein a mobile station is moving unpredictably among many base stations. A powerful diagnostic tool for detecting such problems and obtaining information necessary to suggest a correction, is the obtaining of all call data for calls made by a particular mobile station which has given indications that the processing of calls for that station is not proceeding smoothly. An example of such an indication is the rejection of a hand-off request initiated by a requesting base station by the requested base station.
In the prior art, all such information about calls made from, or to, a selected mobile station are obtained by having a flag associated with that station in all base stations that may serve that mobile station. Since the mobile station is unfettered in its movements, a problem of the prior art is that setting up of such flags without missing base stations that may control calls for the selected mobile station is cumbersome, and likely to set an excessive number of flags. Each flag must be checked on every message from a base station in order to insure that data is collected only for a selected mobile station. In most cases, the number of selected main stations is quite small, but the effect on processing capacity of having to check for every such message whether the mobile station of the message is a flag station, is substantial and adverse. A problem of the prior art is that there is no efficient method of obtaining all or most of the data for a mobile station.
2. Solution
Applicant has further analyzed this problem, and has recognized that it is only necessary to maintain a flag, or monitor indication, in a base station for a selected mobile station whenever that base station is actually controlling actions of the mobile station.
Applicant has solved the above problem, and has made a contribution over the prior art by his invention, wherein a monitor indication is created in a base station whenever the selected mobile station is registered in, or is controlled by that base station; when a mobile station is handed off from one base station to another, the hand-off message set includes an indication that the mobile station being handed off is a selected mobile station whose call record data is being monitored. Advantageously, only the base stations actually controlling a call of the selected mobile station have an indicator for that mobile station, and the search to determine whether a mobile station is being monitored is expedited. Advantageously, such an arrangement minimizes software changes in order to implement Applicant's invention.
In accordance with one alternate embodiment of Applicant's invention, the flag indicator is transmitted in one bit of a proprietary protocol message, during the process of handing off a mobile station from one base station to another.
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Lucent Technologies - Inc.
Maung Nay
Ulrich Werner
Vuong Quochien B.
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