Uplink Transmission Timing Advance in a Wireless Device and Base Station
First Claim
Patent Images
1. A base station comprising:
- a) one or more communication interfaces;
b) one or more processors; and
c) memory storing instructions that, when executed, cause said base station to;
i) transmit to a wireless device at least one control message comprising;
(1) configuration parameters of a plurality of cells grouped into a plurality of cell groups, said plurality of cell groups comprising a primary cell group and a secondary cell group; and
(2) a time-alignment-timer (TAT) value for each of said plurality of cell groups;
ii) transmit to said wireless device at least one timing-advance command (TAC) for said secondary cell group, and start or restart a TAT for said secondary cell group every time said base station transmits a TAC in said at least one TAC, each of said at least one TAC including a timing-advance value (TAV) to be employed by said wireless device to update a first TAV;
iii) transmit, to said wireless device and after said TAT expires, a second TAC with a TAV of zero for said secondary cell group and re-start said TAT; and
iv) receive uplink signals from said wireless device according to said updated first TAV.
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Abstract
A base station transmits to a wireless device at least one timing-advance command (TAC) for a secondary cell group. Each of the at least one TAC includes a timing-advance value (TAV) to be employed by the wireless device to update a first TAV. The base station transmits, to the wireless device and after the TAT expires, a second TAC with a TAV of zero for the secondary cell group. The base station receives uplink signals from the wireless device according to the updated first TAV.
14 Citations
20 Claims
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1. A base station comprising:
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a) one or more communication interfaces; b) one or more processors; and c) memory storing instructions that, when executed, cause said base station to; i) transmit to a wireless device at least one control message comprising; (1) configuration parameters of a plurality of cells grouped into a plurality of cell groups, said plurality of cell groups comprising a primary cell group and a secondary cell group; and (2) a time-alignment-timer (TAT) value for each of said plurality of cell groups; ii) transmit to said wireless device at least one timing-advance command (TAC) for said secondary cell group, and start or restart a TAT for said secondary cell group every time said base station transmits a TAC in said at least one TAC, each of said at least one TAC including a timing-advance value (TAV) to be employed by said wireless device to update a first TAV; iii) transmit, to said wireless device and after said TAT expires, a second TAC with a TAV of zero for said secondary cell group and re-start said TAT; and iv) receive uplink signals from said wireless device according to said updated first TAV. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for use by a base station, the method comprising:
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a) transmitting to a wireless device at least one control message comprising; i) configuration parameters of a plurality of cells grouped into a plurality of cell groups, said plurality of cell groups comprising a primary cell group and a secondary cell group; and ii) a time-alignment-timer (TAT) value for each of said plurality of cell groups; b) transmitting to said wireless device at least one timing-advance command (TAC) for said secondary cell group, and starting or restarting a TAT for said secondary cell group every time said base station transmits a TAC in said at least one TAC, each of said at least one TAC including a timing-advance value (TAV) to be employed by said wireless device to update a first TAV; c) transmitting, to said wireless device and after said TAT expires, a second TAC with a TAV of zero for said secondary cell group and re-starting said TAT; and d) receiving uplink signals from said wireless device according to said updated first TAV. - View Dependent Claims (11, 12)
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13. A wireless device comprising:
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a) one or more communication interfaces; b) one or more processors; and c) memory storing instructions that, when executed, cause said wireless device to; i) receive from a base station at least one control message comprising; (1) configuration parameters of a plurality of cells grouped into a plurality of cell groups, said plurality of cell groups comprising a primary cell group and a secondary cell group; and (2) a time-alignment-timer (TAT) value for each of said plurality of cell groups; ii) generate a first updated timing-advance value (TAV) by updating a first TAV employing at least one first timing-advance command (TAC) received from said base station for said secondary cell group; iii) store said first updated TAV upon expiry of an associated TAT of said secondary cell group; iv) receive a second TAC for said secondary cell group with a TAV of zero, said second TAC starting said associated TAT; and v) transmit uplink signals with a TAV equal to said stored first updated TAV. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification