System and method for handoff between base stations
AssigneeNextel Communications Inc.
InventorsKamran Etemad, Masoud Olfat
Life of this patent
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Abstract
A system and method for handoff are provided. A mobile station performs a make-before-break handoff of a control channel between a serving and target base station and a break-before-make handoff of a traffic channel between the serving and target base stations. The traffic channel handoff is performed after the control channel handoff has completed.
Claims20
A method for handoff of a mobile station from a serving base station to a target base station, the method comprising the acts of:
- receiving data from a serving base station during a first and second time period;
- transmitting control information to the target base station during a time period between the first and second time periods;
- receiving data from the target base station during a time period subsequent to the second time period, wherein the mobile station receives data from only one base station during any particular time period.
A method for handoff of a mobile station from a serving base station to a target base station, the method comprising the acts of:
- receiving data from a serving base station during a first and second time period;
- transmitting control information to the target base station during a time period between the first and second time periods;
- receiving data from the target base station during a time period subsequent to the second time period, wherein the mobile station receives data from only one base station during any particular time period;
- receiving, from the serving base station, a message instructing the mobile station to attempt to handoff to the target base station, wherein the message identifies a reserved ranging channel of the target base station and a connection identification to be used for communicating with the target base station, wherein the message also identifies the time period between the first and second time periods.
A method for handoff of a mobile station from a serving base station to a target base station, the method comprising the acts of:
- receiving data from a serving base station during a first frame;
- transmitting control information to the target base station during a second frame subsequent to the first frame;
- receiving data from the serving base station during a third frame subsequent to the first and second frame;
- receiving data from the target base station during a fourth frame subsequent to the third frame, wherein the mobile station receives data from only one base station during any particular frame.
Dependencies are inferred from the claim text.