| US 7,519,401 B2 | ||
| Efficient radio environment condition recognition | ||
| Ali G. Nader, Malmö (Sweden); and Torgny Palenius, Barsebäck (Sweden) | ||
| Assigned to Telefonaktiebolaget L M Ericsson (publ), Stockholm (Sweden) | ||
| Filed on Jun. 08, 2006, as Appl. No. 11/422,929. | ||
| Prior Publication US 2007/0287510 A1, Dec. 13, 2007 | ||
| Int. Cl. H04B 1/38 (2006.01) | ||
| U.S. Cl. 455—574 [455/434; 455/423; 370/311; 370/328] | 16 Claims |
| 1. A method of operating user equipment (UE) in a cellular telecommunications system, the method comprising:
a controller causing the UE to begin operating in a power saving state by determining that a first set of predefined criteria
have been satisfied; and
the controller causing the UE to leave the power saving state by determining that a second set of predefined criteria have
been satisfied,
wherein determining that the first set of predefined criteria have been satisfied includes:
making a plurality of signal quality measurements of a signal received from a serving cell in the telecommunications system;
making a plurality of signal quality measurements of a signal received from one or more neighboring cells in the telecommunications
system;
determining a first trend line from the signal quality measurements of the serving cell in the telecommunications system;
determining a second trend line from the signal quality measurements of the one or more neighboring cells in the telecommunications
system; and
determining that the first set of predefined criteria have been satisfied if the first and second trend lines are not converging.
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