Method for a radiotelephone to scan for higher priority...

Details Method for a radiotelephone to scan for higher priority... Method for a radiotelephone to scan for higher priority...

2005-11-01

2005-11-01

Maung, Nay (Department: 2684)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S432100, C455S421000, C455S422100, C455S414200

Reexamination Certificate

active

06961569

ABSTRACT:
A method for a radiotelephone to scan for a higher priority (including home) public land mobile network (PLMN) without searching in all possible RATs and frequencies includes a first step of establishing an inclusive list of all frequencies in all radio access technologies (RATs) in use by the higher priority or home public land mobile network. A next step includes camping the radiotelephone on the higher priority or home PLMN. A next step includes obtaining the inclusive list from the establishing step by the camped radiotelephone from the higher priority or home PLMN. Afterwards, when the radiotelephone roams to a lower priority visited PLMN, it can begin scanning for the home (and higher priority) PLMN using only those frequencies from the inclusive list, thereby saving battery power.

REFERENCES:
patent: 5790952 (1998-08-01), Seazholtz et al.
patent: 5915214 (1999-06-01), Reece et al.
patent: 5950130 (1999-09-01), Coursey
patent: 6334052 (2001-12-01), Nordstrand
patent: 6631261 (2003-10-01), Farber
patent: 2004/0192304 (2004-09-01), Casaccia et al.
“3rdGeneration Partnership Project; Technical Specification Group Radio Access Network; Radio Resource Control (RRC); Protocol Specification ” 3GPP TS 25.331; v3.12.0; Sep. 2002.
“3rdGeneration Partnership Project; Technical Specification Group Core Network; NAS Functions related to Mobile Station (MS) in idle mode” 3GPP TS 23.122; v5.2.0; Dec. 2002.

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