Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1998-12-28
2001-10-09
Trost, William (Department: 2683)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S509000, C455S451000, C455S452200, C455S063300, C455S434000, C455S464000, C455S422100, C455S513000
Reexamination Certificate
active
06301481
ABSTRACT:
TECHNICAL FIELD
This invention relates to mobile, or cellular, telephones, and, more particularly, to the selection of the optimum voice channel for a particular phone call.
BACKGROUND OF THE INVENTION
Reverse link clear channels can now be determined. Furthermore, mobile telephones can now report the forward noise levels of specific channels from a mobile assisted channel allocation (“MACA”) list. However, the accurate and efficient determination of adequate serving voice channels, based on these reports, is a problem that has not yet been resolved.
Current channel allocation techniques compare MACA channel measurements to a fixed threshold in order to determine clear voice channels on the forward path. This approach, in addition to being restricted to only adaptive channel allocation (“ACA”) calls, is not effective for all of these calls in a cell, because each call has different minimum noise level requirements. A fixed threshold would therefore be restrictive, by disqualifying many voice channels that would have otherwise served the calls with adequate carrier over interference power ratio (“C/I”) levels. Furthermore, this approach simply determines pass/fail conditions for the MACA channels, instead of prioritizing them.
SUMMARY OF THE INVENTION
The present invention solves the above problem by a method of selecting a voice channel for making a telephone call via a mobile telephone. The method includes the steps of: a cell site, or base station, controller creates and sends a MACA list to a DCCH radio. The DCCH radio sends the MACA list to the mobile telephone for scanning. The ICP assigns an acceptable C/I margin to the mobile's forward VCH RSSI during call setup. In another feature of the invention, the ICP disqualifies from further consideration the MACA channels whose noise levels are too high.
REFERENCES:
patent: 5280630 (1994-01-01), Wang
patent: 5471671 (1995-11-01), Wang et al.
patent: 5594949 (1997-01-01), Andersson et al.
patent: 6108321 (2000-08-01), Anderson et al.
patent: 6122517 (2000-09-01), Imamura
patent: 6219554 (2001-04-01), Eswara et al.
Ferguson Keith
Haynes and Boone LLP
Nortel Networks Limited
Trost William
LandOfFree
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