Patent ID: 6157835
Filing Date: 2000-12-05
Classification: H04W

Abstract:
In a mobile station used in a cellular mobile telecommunications system communicating on any one of a plurality of base station cellular channels depending on cell location of the mobile station, the system being adapted to selectively determine one of the channels to process a call with the mobile station and hand off a cellular call with the mobile station from a current channel to a new channel, a handoff system for detecting system and capability changes when a handoff has occurred, comprising:a memory storing data representing parameters associated with the current channel;a forward communication channel associated with the current channel for receiving data from a base station, said data including a handoff message if a handoff is to occur, the handoff message including parameters associated with the new channel; anda comparator associated with the memory for comparing select stored parameters associated with the current channel to corresponding select received parameters associated with the new channel to determine if system or capabilities of the new channel differ from system or capabilities of the current channel.