Multicarrier Communications Employing Time Alignment Timers
Wireless communications for a plurality of cell groups are described. Uplink transmissions, such as uplink transport blocks, hybrid automatic repeat request (HARQ) transmission, and/or channel state information transmission, may be based on one or more time alignment timers associated with a cell group.
1 . A method comprising:
receiving by a wireless device:
a first value for a first time alignment timer (TAT) associated with a primary cell group; and
a second value for a second TAT associated with a secondary cell group; and
transmitting, by the wireless device while the second TAT is expired and the first TAT is running, channel state information for at least one activated cell of the secondary cell group.
2 . The method of claim 1 , further comprising clearing, based on the first TAT expiring at least one Hybrid Automatic Repeat Request (HARQ) buffer associated with a cell of the primary cell group or associated with a cell of the secondary cell group.
3 . The method of claim 1 , further comprising transmitting, while the second TAT is expired and the first TAT is running, at least one of:
a Hybrid Automatic Repeat Request (HARQ) positive acknowledgement corresponding to at least one transport block received via at least one cell of the secondary cell group or
a HARQ negative acknowledgement corresponding to at least one transport block received via at least one cell of the secondary cell group.
4 . The method of claim 1 , wherein the transmitting the channel state information uses at least one of:
a physical uplink control channel of a primary cell; or
uplink control information feedback in a transport block transmitted via a shared data channel of an uplink carrier.
5 . The method of claim 1 , further comprising performing, by the wireless device and based on the first TAT expiring, uplink transmission of at least one random access preamble via a cell of the primary cell group or via a cell of the secondary cell group.
6 . The method of claim 1 , further comprising performing, by the wireless device and while the second TAT is expired and the first TAT is running, uplink transmission of at least one random access preamble via a cell of the secondary cell group.
7 . The method of claim 1 , further comprising receiving, by the wireless device, configuration parameters associated with a plurality of cells, wherein the plurality of cells comprises the primary cell group and the secondary cell group, and wherein:
uplink transmission timing associated with the primary cell group is based on a first cell of the primary cell group; and
uplink transmission timing associated with the secondary cell group is based on a second cell of the secondary cell group.
8 . The method of claim 1 , further comprising clearing, by the wireless device and while the second TAT is expired and the first TAT is running, at least one Hybrid Automatic Repeat Request (HARQ) buffer associated with the at least one activated cell of the secondary cell group.
9 . The method of claim 1 , further comprising transmitting, by the wireless device, while the second TAT is expired and the first TAT is running, and for the at least one activated cell of the secondary cell group, a Hybrid Automatic Repeat Request (HARQ).
10 . A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
receive:
a first value for a first time alignment timer (TAT) associated with a primary cell group; and
a second value for a second TAT associated with a secondary cell group; and
transmit, while the second TAT is expired and the first TAT is running, channel state information for at least one activated cell of the secondary cell group.
11 . The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
clear, based on the first TAT expiring at least one Hybrid Automatic Repeat Request (HARQ) buffer associated with a cell of the primary cell group or associated with a cell of the secondary cell group.
12 . The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
transmit, while the second TAT is expired and the first TAT is running, at least one of:
a Hybrid Automatic Repeat Request (HARQ) positive acknowledgement corresponding to at least one transport block received via at least one cell of the secondary cell group or
a HARQ negative acknowledgement corresponding to at least one transport block received via at least one cell of the secondary cell group.
13 . The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, cause the wireless device to transmit the channel state information using at least one of:
a physical uplink control channel of a primary cell; or
uplink control information feedback in a transport block transmitted via a shared data channel of an uplink carrier.
14 . The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
perform, based on the first TAT expiring, uplink transmission of at least one random access preamble via a cell of the primary cell group or via a cell of the secondary cell group.
15 . The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
perform, while the second TAT is expired and the first TAT is running, uplink transmission of at least one random access preamble via a cell of the secondary cell group.
16 . The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive configuration parameters associated with a plurality of cells, wherein the plurality of cells comprises the primary cell group and the secondary cell group, and wherein:
uplink transmission timing associated with the primary cell group is based on a first cell of the primary cell group; and
uplink transmission timing associated with the secondary cell group is based on a second cell of the secondary cell group.
17 . The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
clear, while the second TAT is expired and the first TAT is running, at least one Hybrid Automatic Repeat Request (HARQ) buffer associated with the at least one activated cell of the secondary cell group.
18 . The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
transmit, while the second TAT is expired and the first TAT is running, and for the at least one activated cell of the secondary cell group, a Hybrid Automatic Repeat Request (HARQ).
19 . A non-transitory computer-readable medium storing instructions that, when executed, configure a wireless device to:
receive:
a first value for a first time alignment timer (TAT) associated with a primary cell group; and
a second value for a second TAT associated with a secondary cell group; and
transmit, while the second TAT is expired and the first TAT is running, channel state information for at least one activated cell of the secondary cell group.
20 . The non-transitory computer-readable medium of claim 19 , wherein the instructions, when executed, further configure the wireless device to:
clear, based on the first TAT expiring at least one Hybrid Automatic Repeat Request (HARQ) buffer associated with a cell of the primary cell group or associated with a cell of the secondary cell group.
21 . The non-transitory computer-readable medium of claim 19 , wherein the instructions, when executed, further configure the wireless device to:
transmit, while the second TAT is expired and the first TAT is running, at least one of:
a Hybrid Automatic Repeat Request (HARQ) positive acknowledgement corresponding to at least one transport block received via at least one cell of the secondary cell group or
a HARQ negative acknowledgement corresponding to at least one transport block received via at least one cell of the secondary cell group.
22 . The non-transitory computer-readable medium of claim 19 , wherein the instructions, when executed, configure the wireless device to transmit the channel state information using at least one of:
a physical uplink control channel of a primary cell; or
uplink control information feedback in a transport block transmitted via a shared data channel of an uplink carrier.
23 . The non-transitory computer-readable medium of claim 19 , wherein the instructions, when executed, further configure the wireless device to:
perform, based on the first TAT expiring, uplink transmission of at least one random access preamble via a cell of the primary cell group or via a cell of the secondary cell group.
24 . The non-transitory computer-readable medium of claim 19 , wherein the instructions, when executed, further configure the wireless device to:
perform, while the second TAT is expired and the first TAT is running, uplink transmission of at least one random access preamble via a cell of the secondary cell group.
25 . The non-transitory computer-readable medium of claim 19 , wherein the instructions, when executed, further configure the wireless device to receive configuration parameters associated with a plurality of cells, wherein the plurality of cells comprises the primary cell group and the secondary cell group, and wherein:
uplink transmission timing associated with the primary cell group is based on a first cell of the primary cell group; and
uplink transmission timing associated with the secondary cell group is based on a second cell of the secondary cell group.
26 . The non-transitory computer-readable medium of claim 19 , wherein the instructions, when executed, further configure the wireless device to:
clear, while the second TAT is expired and the first TAT is running, at least one Hybrid Automatic Repeat Request (HARQ) buffer associated with the at least one activated cell of the secondary cell group.
27 . The non-transitory computer-readable medium of claim 19 , wherein the instructions, when executed, further configure the wireless device to:
transmit, while the second TAT is expired and the first TAT is running, and for the at least one activated cell of the secondary cell group, a Hybrid Automatic Repeat Request (HARQ).