Method for continuously searching origin public land mobile network

Application Number: 00109038
Application Date: 2000.06.06
Publication Number: 1277527
Publication Date: 2000.12.20
Priority Information: 1999/6/11 US 09/332,265
International: H04Q7/32
Applicant(s) Name: Motorola, Inc.
Inventor(s) Name: Massiat. Jean. Auten;Charles. Philip. Binzr
Patent Agency Code: 11219
Patent Agent: yu mang
Abstract In a mobile station (MS) of a cellular radiotelephone system, a method of searching for the MS's home public land mobile network (HPLMN) when the MS is camped on a non-HPLMN. The method is performed in thirty second intervals while the MS is already in its receive ready (higher current-drawing) state. The method performs strategic measurements of the receive signal level in order to determine if it is likely that the HPLMN has become available again. If the probability is high that the HPLMN has become available, further data is gathered on the likely available channel. Once the channel is identified, the MS begins the camping procedure to register on the HPLMN.