Wireless device preamble transmission timing
Methods and apparatuses are described for wireless communications. Cells may be grouped into a plurality of cell groups. A wireless device may receive a control command and transmit a random access preamble via a secondary cell.
1. A method comprising:
receiving, by a wireless device:
configuration parameters of a plurality of cells comprising a first cell group and a second cell group; and
a parameter of a time alignment timer associated with the second cell group, wherein the time alignment timer starts or restarts based on one or more timing advance commands (TACs);
determining a first updated timing advance value (TAV) by updating a first TAV, associated with the second cell group, based on at least one first TAC associated with the second cell group;
restarting the time alignment timer; and
transmitting, via random access resources of a cell of the second cell group, a random access preamble, wherein transmission timing of the random access preamble is based on the first updated TAV.
2. The method of claim 1 , wherein the first TAV is based on a difference between a received signal timing of a timing reference and a transmission timing of uplink signals.
3. The method of claim 1 , wherein the first TAV is initiated by a random access response for a first random access preamble transmitted via the second cell group, and wherein the random access response comprises the first TAV.
4. The method of claim 1 , further comprising setting the first TAV to zero during configuration of the second cell group.
5. The method of claim 1 , further comprising releasing, by the wireless device and during release of the second cell group, the first updated TAV.
6. The method of claim 1 , further comprising receiving a plurality of random access resource parameters comprising:
an index;
a frequency offset; and
a plurality of sequence parameters.
7. The method of claim 1 , wherein the configuration parameters comprise first configuration parameters of the random access resources.
8. The method of claim 1 , further comprising receiving a plurality of media access control dedicated parameters comprising a plurality of time alignment timer values each associated with a unique cell group.
9. The method of claim 1 , wherein the time alignment timer further starts or restarts based on the wireless device receiving at least one or more TACs for the second cell group.
10. The method of claim 1 , further comprising storing the first updated TAV after expiry of the time alignment timer.
11. 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:
configuration parameters of a plurality of cells comprising a first cell group and a second cell group; and
a parameter of a time alignment timer associated with the second cell group, wherein the time alignment timer starts or restarts based on one or more timing advance commands (TACs);
determine a first updated timing advance value (TAV) by an update of a first TAV, associated with the second cell group, based on at least one first TAC associated with the second cell group;
restart the time alignment timer; and
transmit, via random access resources of a cell of the second cell group, a random access preamble, wherein transmission timing of the random access preamble is based on the first updated TAV.
12. The wireless device of claim 11 , wherein the first TAV is based on a difference between a received signal timing of a timing reference and a transmission timing of uplink signals.
13. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive the first TAV via a random access response to a first random access preamble transmitted via the second cell group.
14. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to set the first TAV to zero during configuration of the second cell group.
15. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to release, during release of the second cell group, the first updated TAV.
16. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive a plurality of random access resource parameters comprising:
an index;
a frequency offset; and
a plurality of sequence parameters.
17. The wireless device of claim 11 , wherein the configuration parameters comprise first configuration parameters of the random access resources.
18. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive a plurality of media access control dedicated parameters comprising a plurality of time alignment timer values each associated with a unique cell group.
19. The wireless device of claim 11 , wherein the time alignment timer further starts or restarts based on the wireless device receiving at least one or more TACs for the second cell group.
20. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to store the first updated TAV after expiry of the time alignment timer.
21. A system comprising:
a base station; and
a wireless device;
wherein the base station is configured to:
transmit:
configuration parameters of a plurality of cells comprising a first cell group and a second cell group; and
a parameter of a time alignment timer associated with the second cell group, wherein the time alignment timer starts or restarts based on one or more timing advance commands (TACs); and
wherein the wireless device is configured to:
determine a first updated timing advance value (TAV) by an update of a first TAV, associated with the second cell group, based on at least one first TAC associated with the second cell group;
restart the time alignment timer; and
transmit, via random access resources of a cell of the second cell group, a random access preamble, wherein transmission timing of the random access preamble is based on the first updated TAV.
22. The system of claim 21 , wherein the first TAV is based on a difference between a received signal timing of a timing reference and transmission timing of uplink signals.
23. The system of claim 21 , wherein the base station is further configured to transmit the first TAV via a random access response to a first random access preamble transmitted via the second cell group.
24. The system of claim 21 , wherein the wireless device is further configured to set the first TAV to zero during configuration of the second cell group.
25. The system of claim 21 , wherein the wireless device is further configured to release, during release of the second cell group, the first updated TAV.
26. The system of claim 21 , wherein the wireless device is further configured to receive a plurality of random access resource parameters comprising:
an index;
a frequency offset; and
a plurality of sequence parameters.
27. The system of claim 21 , wherein the configuration parameters comprise first configuration parameters of the random access resources.
28. The system of claim 21 , wherein the wireless device is further configured to receive a plurality of media access control dedicated parameters comprising a plurality of time alignment timer values each associated with a unique cell group.
29. The system of claim 21 , wherein the time alignment timer further starts or restarts based on the wireless device receiving at least one or more TACs for the second cell group.
30. The system of claim 21 , wherein the wireless device is further configured to store the first updated TAV after expiry of the time alignment timer.
31. A method comprising:
transmitting, by a base station:
configuration parameters of a plurality of cells comprising a first cell group and a second cell group; and
a parameter of a time alignment timer associated with the second cell group, wherein the time alignment timer starts or restarts based on one or more timing advance commands (TACs);
determining a first updated timing advance value (TAV) by updating a first TAV, associated with the second cell group, based on at least one first TAC associated with the second cell group;
restarting the time alignment timer; and
transmitting, by a wireless device via random access resources of a cell of the second cell group, a random access preamble, wherein transmission timing of the random access preamble is based on the first updated TAV.
32. The method of claim 31 , wherein the first TAV is based on a difference between a received signal timing of a timing reference and transmission timing of uplink signals.
33. The method of claim 31 , further comprising
transmitting, by the wireless device via the second cell group, a first random access preamble; and
transmitting, by the base station after receiving the first random access preamble, a random access response comprising the first TAV.
34. The method of claim 31 , further comprising setting the first TAV to zero during configuration of the second cell group.
35. The method of claim 31 , further comprising releasing, by the wireless device during release of the second cell group, the first updated TAV.
36. The method of claim 31 , further comprising transmitting a plurality of random access resource parameters comprising:
an index;
a frequency offset; and
a plurality of sequence parameters.
37. The method of claim 31 , wherein the configuration parameters comprise first configuration parameters of the random access resources.
38. The method of claim 31 , further comprising transmitting a plurality of media access control dedicated parameters comprising a plurality of time alignment timer values each associated with a unique cell group.
39. The method of claim 31 , wherein the time alignment timer further starts or restarts based on the wireless device receiving at least one or more TACs for the second cell group.
40. The method of claim 31 , further comprising storing the first updated TAV after expiry of the time alignment timer.
41. A non-transitory computer-readable medium storing instructions that, when executed, cause:
receiving:
configuration parameters of a plurality of cells comprising a first cell group and a second cell group; and
a parameter of a time alignment timer associated with the second cell group, wherein the time alignment timer starts or restarts based on one or more timing advance commands (TACs);
determining a first updated timing advance value (TAV) by updating a first TAV, associated with the second cell group, based on at least one first TAC associated with the second cell group;
restarting the time alignment timer; and
transmitting, via random access resources of a cell of the second cell group, a random access preamble, wherein transmission timing of the random access preamble is based on the first updated TAV.
42. The non-transitory computer-readable medium of claim 41 , wherein the first TAV is based on a difference between a received signal timing of a timing reference and a transmission timing of uplink signals.
43. The non-transitory computer-readable medium of claim 41 , wherein the first TAV is initiated by a random access response for a first random access preamble transmitted via the second cell group, and wherein the random access response comprises the first TAV.
44. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, cause setting the first TAV to zero during configuration of the second cell group.
45. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, cause releasing, during release of the second cell group, the first updated TAV.
46. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, cause receiving a plurality of random access resource parameters comprising:
an index;
a frequency offset; and
a plurality of sequence parameters.
47. The non-transitory computer-readable medium of claim 41 , wherein the configuration parameters comprise first configuration parameters of the random access resources.
48. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, cause receiving a plurality of media access control dedicated parameters comprising a plurality of time alignment timer values each associated with a unique cell group.
49. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, cause the time alignment timer to start or restart based on receiving at least one or more TACs for the second cell group.
50. The non-transitory computer-readable medium of claim 41 , wherein the instructions, when executed, cause storing the first updated TAV after expiry of the time alignment timer.