System and Method for Handoff Between Base Stations
First Claim
Patent Images
1. 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.
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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.
110 Citations
41 Claims
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1. A method for handoff of a mobile station from a serving base station to a target base station, the method comprising the acts of:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for handoff, comprising the acts of:
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informing a mobile station of a first set of time periods for communicating with a target base station over a second control channel;
scheduling information for transmission to the mobile station during time periods other than the first set of time periods; and
transmitting the scheduled information to the mobile station over a first traffic channel during periods of time other than the first set of time periods. - View Dependent Claims (11, 14, 15, 16, 17, 18, 19)
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12. The method of claim lo, further comprising the act of:
informing the target base station of information related to the mobile station. - View Dependent Claims (13)
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20. A method for a mobile station to handoff from a serving base station to target base station, the method comprising the acts of:
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communicating with the serving base station over a first traffic channel and a first control channel during a first time period;
communicating with the target base station over a second control channel during a second time period;
communicating with the serving base station over the first traffic and control channels during a third time period, which is subsequent to the second time period; and
communicating with the target base station of the second control channel and a second traffic channel during a fourth time period. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for a mobile station handoff from a serving base station to a target base station, the method comprising the acts of:
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identifying a base station as the target base station;
exchanging control channel messages with the target base station; and
communicating over a traffic channel with the serving base while exchanging the control channel messages with the target base station. - View Dependent Claims (32, 33, 34)
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35. A method for a serving base station supporting a handoff of a mobile station to a target base station, the method comprising the acts of:
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receiving, from the mobile station, an identification of the target base station;
informing the target base station of a handoff attempt by the mobile station;
communicating over a traffic channel with the mobile station, while the mobile station exchanges control channel messages with the mobile station. - View Dependent Claims (36, 37, 38)
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39. A method for a mobile station handoff from a serving base station to a target base station, the method comprising the acts of:
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performing a make-before-break handoff of a control channel between the serving and target base stations; and
performing a break-before-make handoff of a traffic channel between the serving and target base stations. - View Dependent Claims (40, 41)
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Specification