Radio station, radio terminal, and method for controling transmission timing in radio communication system
First Claim
1. A radio station configured to communicate with a radio terminal by using a plurality of radio resources that correspond respectively to a plurality of cells, wherein the plurality of cells includes a first cell and a second cell and are associated with a plurality of cell groups, comprising:
- a memory device that stores a set of instructions; and
at least one processor configured to execute the set of instructions to;
calculate at least one of a first uplink-signal transmission timing adjustment value for the first cell and a second uplink-signal transmission timing adjustment value for the second cell;
determine whether at least one of the first and second cells is in uplink-signal synchronization with the radio station;
responsive to determining that the first cell is in uplink-signal synchronization with the radio station and that the second cell is not in uplink-signal synchronization with the radio station, transmit the first uplink-signal transmission timing adjustment value to the radio terminal, wherein the second up-signal transmission timing adjustment value is excluded from the transmission.
1 Assignment
0 Petitions
Accused Products
Abstract
A radio station, a radio terminal, and a method for transmission timing control in a radio communications system are provided that facilitate uplink-signal synchronization management in a plurality of cell groups. The radio station (10) calculates uplink-signal transmission timing adjustment values TA1 and TA2 for respective cell groups (1, 2), each of which includes at least one cell including an available uplink radio resource, and notifies the calculated uplink-signal transmission timing adjustment values TA1 and TA2 to the radio terminal (20) at a time.
13 Citations
42 Claims
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1. A radio station configured to communicate with a radio terminal by using a plurality of radio resources that correspond respectively to a plurality of cells, wherein the plurality of cells includes a first cell and a second cell and are associated with a plurality of cell groups, comprising:
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a memory device that stores a set of instructions; and at least one processor configured to execute the set of instructions to; calculate at least one of a first uplink-signal transmission timing adjustment value for the first cell and a second uplink-signal transmission timing adjustment value for the second cell; determine whether at least one of the first and second cells is in uplink-signal synchronization with the radio station; responsive to determining that the first cell is in uplink-signal synchronization with the radio station and that the second cell is not in uplink-signal synchronization with the radio station, transmit the first uplink-signal transmission timing adjustment value to the radio terminal, wherein the second up-signal transmission timing adjustment value is excluded from the transmission. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for transmission timing control at a radio station configured to communicate with a radio terminal by using a plurality of radio resources that correspond respectively to a plurality of cells, wherein the plurality of cells includes a first cell and a second cell and are associated with a plurality of cell groups, comprising:
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calculating at least one of a first uplink-signal transmission timing adjustment value for the first cell and a second uplink-signal transmission timing adjustment value for the second cell, determining whether at least one of the first and second cells is in uplink-signal synchronization with the radio station; responsive to determining that the first cell is in uplink-signal synchronization with the radio station and the second cell is not in uplink-signal synchronization with the radio station, transmitting the first uplink-signal transmission timing adjustment value to the radio terminal, wherein the second uplink-signal transmission timing adjustment value is excluded from the transmission. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A radio terminal configured to communicate with a radio station by using a plurality of radio resources that correspond respectively to a plurality of cells, wherein the plurality of cells includes a first cell and a second cell and are associated with a plurality of cell groups, comprising:
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a memory device that stores a set of instructions; and at least one processor configured to execute the set of instructions to receive uplink-signal transmission timing adjustment values for at least one of the first and second cells from the radio station, wherein the transmission timing adjustment value for the second cell is not received from the radio station based on a determination that the second cell loses uplink-signal synchronization with the radio station. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for transmission timing control at a radio terminal configured to communicate with a radio station by using a plurality of radio resources that correspond respectively to a plurality of cells, wherein the plurality of cells includes a first cell and a second cell and are associated with a plurality of cell groups, comprising:
receiving uplink-signal transmission timing adjustment values for at least one of the first and second cells from the radio station, wherein the transmission timing adjustment value for the second cell is not received from the radio station based on a determination that the second cell loses uplink-signal synchronization with the radio station. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A radio communications system in which a radio station and a radio terminal are configured to communicate with each other by using a plurality of radio resources that correspond to a plurality of cells, wherein the plurality of cells includes a first cell and a second cell and are associated with a plurality of cell groups, wherein the radio station comprises:
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a first memory device that stores a first set of instructions; and at least one first processor configured to execute the first set of instructions to; calculate at least one of a first uplink-signal transmission timing adjustment value for the first cell and a second uplink-signal transmission timing adjustment value for the second cell; determine whether at least one of the first and second cells is in uplink-signal synchronization with the radio station; and responsive to determining that the first cell is in uplink-signal synchronization with the radio station and the second cell is not in uplink-signal synchronization with the radio station, transmit the first uplink-signal transmission timing adjustment value to the radio terminal, wherein the second uplink-signal transmission timing adjustment value is excluded from the transmission; wherein the radio terminal comprises; a second memory device that stores a second set of instructions and; at least one second processor configured to execute the second set of instructions to receive the uplink-signal transmission timing adjustment values for at least one of the first cells and the second cells from the radio station. - View Dependent Claims (35, 36, 37, 38)
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39. A radio station configured to communicate with a radio terminal by using a plurality of radio resources that correspond respectively to a plurality of cells, wherein the plurality of cells includes a first cell and a second cell and are associated with a plurality of cell groups, comprising:
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a memory device that stores a set of instructions; and at least one processor configured to execute the set of instructions to; calculate an uplink-signal transmission timing adjustment value for at least one of the first and second cells; determine whether at least one of the first and second cells is in uplink-signal synchronization with the radio station; responsive to determining that the at least one of the first and second cells are in uplink-signal synchronization with the radio station, transmit the uplink-signal transmission timing adjustment values calculated for the at least one of the first and second cells to the radio terminal, wherein an uplink-transmission timing adjustment value associated with a cell that is not in uplink-signal synchronization with the radio station is excluded from the transmission. - View Dependent Claims (40)
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41. A method for transmission timing control at a radio station configured to communicate with a radio terminal by using a plurality of radio resources that correspond respectively to a plurality of cells, wherein the plurality of cells includes a first cell and a second cell and are associated with a plurality of cell groups, comprising:
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calculating an uplink-signal transmission timing adjustment value for at least one of the first and second cells; determining whether at least one of the first and second cells is in uplink-signal synchronization with the radio station; responsive to determining that the at least one of the first and second cells are in uplink-signal synchronization with the radio station, transmitting the uplink-signal transmission timing adjustment values calculated for the at least one of the first and second cells to the radio terminal, wherein an uplink-transmission timing adjustment value associated with a cell that is not in uplink-signal synchronization with the radio station is excluded from the transmission. - View Dependent Claims (42)
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Specification