Method for preventing dropped calls in a wireless communication system

• Main Authors: RAAFAT, KAMEL E, QI BI, YUEN-YIN, KOO L, MATTHEW, THOMAS, ESHWAR, PITTAMPALLI
• Format: Patent
• Language: English; French; German
• Published: 23.07.2003
• Edition: 7
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; WIRELESS COMMUNICATIONS NETWORKS

A mobile station automatically initiates recovery of a call when the mobile station loses communications with a base station or a group of base stations. While communicating with one or more base stations, the mobile station monitors signals from other base stations. These signals are measured to determine the strength signals received from base stations within the reception area of the mobile station. When the mobile station loses a traffic channel that is being used to communicate voice or data with one or more base stations, the mobile station attempts to connect to another base station. The base station that the mobile chooses to contact is the base station that has the strongest signal that was previously monitored by the mobile station. When the mobile station makes contact with the new base station, it requests a handoff from the base stations with which contact was lost, to another set of base stations that can provide communication services to the mobile station. In response to the mobile station's request and based on signal strength measurements of other base stations that were included in the mobile station's handoff request, the mobile station is assigned new traffic channels with one or more base stations.