Method of controlling handover in uplink synchronous transmission scheme
First Claim
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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;
reconfiguring a radio link between a mobile station and the second base station, based on the information for the uplink synchronous transmission;
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 when the mobile station moves from a first area corresponding to the first base station to a second area corresponding to the second base station;
transmitting the information on the uplink synchronous transmission from the radio network controller to another radio netxvork controller, if the first and second base stations are controlled by different radio network controllers;
reconfiguring the radio link based on the information for the uplink synchronous transmission transmitted from the radio network controlier; and
adjusting an uplink synchronous timing of the mobile station for the uplink synchronous transmission, on the basis of the reconfigured radio link, to match an uplink synchronous timing of the base station controlled by the another radio network controller.
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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.
23 Citations
17 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; reconfiguring a radio link between a mobile station and the second base station, based on the information for the uplink synchronous transmission; 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 when the mobile station moves from a first area corresponding to the first base station to a second area corresponding to the second base station; transmitting the information on the uplink synchronous transmission from the radio network controller to another radio netxvork controller, if the first and second base stations are controlled by different radio network controllers; reconfiguring the radio link based on the information for the uplink synchronous transmission transmitted from the radio network controlier; and adjusting an uplink synchronous timing of the mobile station for the uplink synchronous transmission, on the basis of the reconfigured radio link, to match an uplink synchronous timing of the base station controlled by the another radio network controller. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controUing a communication link, comprising:
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measuring a first communication characteristic between a common terminal and a target terminal; measuring a second communication characteristic between a current terminal and the common terminal; determining whether to establish a synchronous communication link between the common terminal and the target terminal based on the measured first communication characteristic and the measured second communication characteristic; establishing the 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 the current terminal to the target terminal, using the synchronous communication link. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. 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, wherein the network controller establishing the synchronous communication link by changing a mode of communication between the target terminal and the common terminal from an asynchronous mode to a synchronous mode and changing a mode of communication between the current terminal and the common terminal from the synchronous mode to the asynchronous mode.
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16. 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, wherein establishing the synchronous communication link includes changing a mode of communication between the target terminal and the common terminal from an asynchronous mode to a synchronous mode and changing a mode of communication between a current terminal and the common terminal from the synchronous mode to the asynchronous mode; and transitioning communication service support for the common terminal from the current terminal to the target terminal using the synchronous communication link. - View Dependent Claims (17)
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Specification