Patent ID: 6216004
Filing Date: 2001-04-10
Classification: H04W,Y02D

Abstract:
A method of transmission of control information between a mobile unit and a base station in spread spectrum communications system:monitoring by a mobile unit the power level of control signals received from multiple base stations;identifying by the mobile unit a first set of base stations for which the received power level of the received control signal exceeds a prescribed level;sending a power measurement message from the mobile unit to at least one base station in the set that identifies the base stations in the identified first set;sending to the mobile unit by at least one base station a message that specifies a second set of base stations that are permitted to transmit to the mobile unit in soft handoff; andcommunicating a control message to the mobile unit in soft handoff from multiple base stations that are members of both the first set and the second set;wherein at least one member of the second set of base stations is determined based on independent soft handoff information other than the information provided by the mobile unit relating to the power level of control signals.