RESELECT PROCEDURE FOR REDUCED PORTABLE BATTERY DRAIN
Original Publication Date: 1995-Mar-01
Included in the Prior Art Database: 2002-Mar-18
The requirement to stay connected to the best control channel during idle periods (called "reselec- tion") can dominate portable battery life. Presently, reselection involves signal quality estimator (SQE) monitoring of the current control channel and one neighbor cell control channel once per two frame periods. Seven foreground cycles are required to obtain a credible SQE estimate of the best neigh- boring control channel. Assuming 12 neighbor cells are monitored and the foregouund membership is limited to 3 members, the "response time" for the current approach is roughly 56 frames (4 frames per foreground cycle times 7 cycles per foreground esti- mate times 2 frames per measurement; 1 frame occu- pying 90 ms), about 5 seconds. Since typical lognormal shadowing decorrelation times are 15 sec- onds. it would not be advisable to reselect at a slower rate.