Patent ID: 6157836
Filing Date: 2000-12-05
Classification: H04W

Abstract:
A method of affecting handoff of a wireless subscriber station from a first cell to a second cell in a Cellular Digital Packet Data (CDPD) system, where said wireless subscriber station contains a first cell transfer database pertaining to radio frequency characteristics of said first cell, said method comprising steps of:(a) sending a polling receiver ready (RR) signal from said wireless subscriber station to a CDPD Mobile Data Base Station (NDBS) in said second cell;(b) determining a first time interval for a complete Received Signal Strength Indication (RSSI) scan of said second cell by said wireless subscriber station;(c) dividing said first time interval into a plurality of sequential overlapping time slots;(d) alternately scanning said CDPD channel and an Advanced Mobile Phone Service (AMPS) control channel during successive time slots, thereby creating a second cell transfer data base transfer data base pertaining to said second cell; and(e) deleting said first cell transfer database upon acquisition of said second cell transfer database.