Managing sounding signals to limit power in a multicarrier wireless device
A wireless device receives message(s) configuring cell groups and transmissions of sounding reference signals (SRSs). Uplink transmission timing in a first cell group is derived employing a cell in the first cell group and uplink transmission timing in a second cell group is derived employing a second cell in the second cell group. A first signal is transmitted on a cell of the first cell group. A first subset of the SRSs are dropped and a second subset of the SRSs are transmitted if transmission of SRSs overlap in time with transmission of the first signal and a calculated total transmission power exceeds a first power value.
1. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed, cause the wireless device to:
receive at least one message comprising configuration parameters of a plurality of cells being grouped into a plurality of cell groups comprising a first cell group and a second cell group, wherein:
uplink transmission timing in the first cell group is derived employing a first cell in the first cell group; and
uplink transmission timing in the second cell group is derived employing a second cell in the second cell group;
transmit a first signal on a cell of the first cell group; and
if a configured transmission of sounding reference signals (SRSs) overlaps in time with transmission of the first signal and if a calculated total transmission power exceeds a first power value:
drop a first subset of the SRSs; and
transmit a second subset of the SRSs.
2. The wireless device of claim 1 , wherein:
the first subset of the SRSs comprises one or more of the SRSs; and
the second subset of the SRSs comprises one or more of the SRSs.
3. The wireless device of claim 1 , wherein the first signal comprises a physical uplink control channel signal or a physical uplink shared channel signal.
4. The wireless device of claim 1 , wherein the configured transmission of the SRSs is configured for transmission in a last symbol of a first subframe.
5. The wireless device of claim 1 , wherein:
a) the configured transmission of the SRSs is configured for transmission in a last symbol of a first subframe; and
b) the first signal is transmitted in the first subframe.
6. The wireless device of claim 1 , wherein the first signal comprises a random access preamble.
7. The wireless device of claim 1 , wherein the first power value is a maximum transmission power value of the wireless device.
8. The wireless device of claim 1 , wherein the instructions, when executed, further cause the wireless device to adjust transmission power of the second subset of the SRSs.
9. The wireless device of claim 1 , wherein the instructions, when executed, further cause the wireless device to adjust a transmission power of a second signal if the calculated total transmission power exceeds the first power value.
10. The wireless device of claim 9 , wherein the second signal is one of a physical uplink control channel signal and a physical uplink shared channel signal.
11. A method comprising:
receiving at least one message comprising configuration parameters of a plurality of cells being grouped into a plurality of cell groups comprising a first cell group and a second cell group, wherein:
uplink transmission timing in the first cell group is derived employing a first cell in the first cell group; and
uplink transmission timing in the second cell group is derived employing a second cell in the second cell group;
transmitting a first signal on a cell of the first cell group; and
if a configured transmission of sounding reference signals (SRSs) overlaps in time with transmission of the first signal and if a calculated total transmission power exceeds a first power value:
dropping a first subset of the SRSs; and
transmitting a second subset of the SRSs.
12. The method of claim 11 , wherein:
the first subset of the SRSs consist of one or more of the SRSs; and
the second subset of the SRSs consist of one or more of the SRSs.
13. The method of claim 11 , wherein the first signal is a physical uplink control channel signal or a physical uplink shared channel signal.
14. The method of claim 11 , wherein the configured transmission of the SRSs is configured for transmission in a last symbol of a first subframe.
15. The method of claim 11 , wherein:
a) the configured transmission of the SRSs is configured for transmission in a last symbol of a first subframe; and
b) the first signal is transmitted in the first subframe.
16. The method of claim 11 , wherein the first signal is a random access preamble.
17. The method of claim 11 , wherein the first power value is a maximum transmission power value of the wireless device.
18. The method of claim 11 , wherein the instructions, when executed, further cause the wireless device to adjust transmission power of the second subset of the SRSs.
19. The method of claim 11 , wherein the instructions, when executed, further cause the wireless device to adjust a transmission power of a second signal if the calculated total transmission power exceeds the first power value.
20. The method of claim 19 , wherein the second signal is one of a physical uplink control channel signal and a physical uplink shared channel signal.