| US 7,546,149 B2 | ||
| Deep sleep mode for portable communication device | ||
| Naveen Aerrabotu, Gurnee, Ill. (US); William P. Alberth, Jr., Prairie Grove, Ill. (US); Daniel J. Declerck, Lake Barrington, Ill. (US); Murall Narasimha, Grayslake, Ill. (US); and William E. Welnick, Poway, Calif. (US) | ||
| Assigned to Motorola, Inc., Schaumburg, Ill. (US) | ||
| Filed on Mar. 08, 2005, as Appl. No. 11/75,540. | ||
| Prior Publication US 2006/0205444 A1, Sep. 14, 2006 | ||
| Int. Cl. H04B 1/38 (2006.01); H04M 1/00 (2006.01) | ||
| U.S. Cl. 455—574 [455/552.1; 455/553.1; 455/343.2] | 13 Claims |
| 1. A method for power conservation in a portable communication device capable of communication on either of a first communication
path and a second communication path, the method comprising the steps of:
detecting signals of a first communication path;
operating in a first communication mode on the first communication path;
deregistering from the second communication path while operating in the first communication mode on the first communication
path;
while deregistered from the second communication path, monitoring at least one housekeeping channel on the second communication
path at times separated by a predetermined time interval; and
switching operation from the first communication mode to a second communication mode on the second communication path in response
to a predetermined event.
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