Using an enhanced preferred roaming list in a terminal device

Details Using an enhanced preferred roaming list in a terminal device Using an enhanced preferred roaming list in a terminal device

2007-08-21

2007-08-21

Corsaro, Nick (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S450000, C455S436000

Reexamination Certificate

active

10964182

ABSTRACT:
A method (200) in a CDMA terminal device for acquiring a system identified in an enhanced preferred roaming list (enhanced PRL), with at least one entry containing a mobile country code, includes the steps of obtaining (210) system identifiers from SYNCH channels on a scan list, determining (220) if the system identifiers match entries on the enhanced PRL, and inserting (226) channel information items on a first list if the system identifiers do not match entries on the enhanced PRL. If all channels on the scan list have been scanned without any system identifiers matching entries on the enhanced PRL, the method obtains (246) mobile country codes using channel information items from the first list, determines (250) if the mobile country codes match entries on the enhanced PRL, and camps (283) on a system if its mobile country code matches an entry on the enhanced PRL.

REFERENCES:
patent: 5734980 (1998-03-01), Hooper et al.
patent: 2003/0083064 (2003-05-01), Cooper
patent: 2004/0192304 (2004-09-01), Casaccia et al.
patent: 2004/0236849 (2004-11-01), Cooper et al.
patent: 1 292 169 (2003-03-01), None
Nobuyuki Uchida; “GSM/UMTS PRL Overview”; XP002358638; Nov. 3, 2003; pp. 1-20.
Andrew Hunter; “PRL Enhancements for International Roaming”; XP002358637; Feb. 2004; pp. 1-16.
Andrew Hunter, CDG Workshop; PRL Enhancements for International Roaming; Feb. 2004.
CDMA Development Group; PRL Enhancements For International Roaming; Version 1.0; Apr. 1, 2004; CDG Document 86.
Rotem Cooper; PRL Enhancements for International Roaming; Feb. 2004.
PRL Enhancement Workshop; PRL Enhancements Frequently Asked Questions; Feb. 2004; San Diego.
Nobuyuki Uchida; GSM/UMTS PRL Overview; Nov. 3, 2003.
Perry Laforge; Support for Preferred Roaming List Enhancements for International Roaming; CDG Resolution 2003.2; Dec. 8, 2003.

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