METHOD FOR EARLY DETECTION OF NON-ADJACENT SITE ROAMING
Original Publication Date: 2000-Jan-01
Included in the Prior Art Database: 2002-Sep-16
A Motorola subscriber unit (SU) on a multiple site trunked system relies on adjacent site informa- tion for roaming. It uses this information which contains site addressing, state of the site, and chan- nel information to determine when and where to make site switches. The SU also uses a pro- grammed control channel (CC) list if the adjacent site information does not provide a usable site when going out of range of its current site of operation. Inefficient operation can occur when a powered- down SU travels beyond all known adjacent sites and is then powered up. The SU can find a site through its CC list of frequencies, but may not find the best site for its location. This algorithm will improve SU roaming in this scenario.