Method of controlling handover in uplink synchronous transmission scheme
First Claim
Patent Images
1. A method of controlling a handover of a communication link, comprising:
- transmitting information for an uplink synchronous transmission from a radio network controller to a first base station and a second base station;
resetting a radio link between a mobile station and the second base station, based on the information for the uplink synchronous transmission; and
adjusting a base time for the uplink synchronous transmission of communication data by the mobile station to match the base time of an uplink synchronization scheme of the second base station.
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Abstract
A method of controlling a handover is disclosed that uses both a soft handover and a hard handover in an uplink synchronous transmission scheme to synchronize the reception timing between mobile stations in an area of a base station. The uplink synchronous timing of a mobile station established with respect to a first base station can be adjusted to the uplink synchronous timing of a second base station, after re-setting a radio link with the adjusted uplink synchronous information.
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Citations
28 Claims
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1. A method of controlling a handover of a communication link, comprising:
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transmitting information for an uplink synchronous transmission from a radio network controller to a first base station and a second base station;
resetting a radio link between a mobile station and the second base station, based on the information for the uplink synchronous transmission; and
adjusting a base time for the uplink synchronous transmission of communication data by the mobile station to match the base time of an uplink synchronization scheme of the second base station. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26)
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3. The method of clam 1, wherein the information for the uplink synchronous transmission is a scramble code of the uplink synchronous transmission scheme.
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12. A method of changing a base time for a synchronous transmission scheme, comprising:
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transmitting communication data to a first base station;
checking a second pilot signal from a second base station;
transmitting communication data to the second base station;
checking a first pilot signal from the first base station and rechecking the second pilot signal from the second base station; and
changing a base time for the synchronous transmission scheme used by a mobile station to a base time of the second base station.
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19. A method of controlling a communication link, comprising:
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measuring a first communication characteristic between a common terminal and a target terminal;
establishing a synchronous communication link between the common terminal and the target terminal, the synchronous communication link established in accordance with a timing adjustment value derived from the first communication characteristic measurement; and
transitioning communication service support for the common terminal from a current terminal to the target terminal, using the synchronous communication link.
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27. A system for managing a communication link, comprising:
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a common terminal that communicates with both a target terminal and a current terminal and measures a communication characteristic between the common terminal and the target terminal; and
a network controller that manages the operation of the current terminal and the target terminal, the network controller establishes a synchronous communication link between the common terminal and the target terminal based on a timing adjustment value derived from the communication characteristic measurement and transitions communication service support for the common terminal from the current terminal to the target terminal, using the synchronous communication link.
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28. A communication subscriber device, comprising:
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a signal measuring means for measuring a first communication characteristic between a target terminal and the subscriber device;
a link establishment means for establishing a synchronous communication link between the target terminal and the subscriber device, the synchronous communication link established in accordance with a timing adjustment value derived from the first communication characteristic measurement; and
a link handover means for transitioning communication service support for the subscriber device from a current terminal to the target terminal, using the synchronous communication link.
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Specification