CELL SELECTION BACKOFF ALGORITHM FOR IMPROVED PORTABLE RADIO BATTERY LIFE
Original Publication Date: 1995-Mar-01
Included in the Prior Art Database: 2002-Mar-21
In the Motorola Integrated Radio System (MIRS), subscriber radios go through a Cell Selection proc- ess upon power-up or when out of coverage in an attempt to find an acceptable MIRS control chan- nel. An acceptable MIRS control channel is one that has significantly good signal strength and signal qual- ity and is one that belongs to a system that the radio is allowed to use. The Cell Selection algorithm involves scanning the available band of frequencies for an acceptable MIRS control channel and the radio will continue to scan until an acceptable MIRS con- trol channel is found. The MIRS system uses a TDMA RF interface such that a subscriber radio performs RF and DSP activity roughly only 17% of the time and Host processor activity is minimized during normal, idle operation. During Cell Selec- tion, however, both the Host and DSP are running nearly 100% ofthe time in order to locate an accept- able MIRS control channel.