Wireless device sounding procedure
A wireless device receives at least one message comprising configuration parameters of a plurality of cells grouped into a plurality of physical uplink control channel (PUCCH) groups. The wireless device transmits, in a subframe and in a first PUCCH group, at least one SRS employing a sounding procedure for the first PUCCH group. The sounding procedure may depend, at least in part, on transmissions of a physical uplink shared channel (PUSCH) or a PUCCH in the first PUCCH group and may be independent of transmissions of PUCCH and PUSCH in a second PUCCH group. The plurality of cells may be in the same timing advance group.
1. A method comprising:
receiving, by a wireless device, configuration parameters of cells grouped into physical uplink control channel (PUCCH) groups comprising a first PUCCH group and a second PUCCH group, wherein the cells are in the same timing advance group;
transmitting, in a time interval and via the first PUCCH group, at least one sounding reference signal (SRS) employing a sounding procedure for the first PUCCH group, wherein the sounding procedure:
depends on transmissions, in the time interval, of a PUCCH in the first PUCCH group; and
is independent of transmissions, in the time interval, of a PUCCH in the second PUCCH group.
2. The method of claim 1 , wherein the wireless device is not uplink power limited in the time interval.
3. The method of claim 1 , wherein the sounding procedure comprises a first procedure for transmitting one or more SRSs and a second procedure for dropping transmission of one or more SRSs.
4. The method of claim 1 , further comprising:
transmitting a first SRS via a first cell of the first PUCCH group in parallel with a first data packet via a second cell of the second PUCCH group; and
dropping a configured transmission of a second SRS on the first cell when a second data packet is transmitted via a third cell of the first PUCCH group in parallel with the configured transmission of the second SRS.
5. The method of claim 1 , further comprising:
transmitting a first SRS on a first cell of the first PUCCH group in parallel with a first PUCCH signal via a second cell of the second PUCCH group; and
dropping a configured transmission of a second SRS on the first cell when a second PUCCH signal is transmitted via a third cell of the first PUCCH group in parallel with the configured transmission of the second SRS.
6. The method of claim 1 , wherein the receiving further comprises receiving SRS configuration parameters comprising an SRS bandwidth parameter and an SRS subframe configuration parameter.
7. The method of claim 1 , further comprising:
triggering an SRS type 1 transmission in response to a message; or
triggering an SRS type 2 transmission in response to downlink control information transmitted via a downlink physical channel.
8. The method of claim 1 , wherein the cells comprise a primary cell and one or more secondary cells.
9. 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 cells grouped into physical uplink control channel (PUCCH) groups comprising a first PUCCH group and a second PUCCH group, wherein the cells are in the same timing advance group;
transmit, in a time interval and via the first PUCCH group, at least one sounding reference signal (SRS) employing a sounding procedure for the first PUCCH group, wherein the sounding procedure:
depends on transmissions, in the time interval, of a PUCCH in the first PUCCH group; and
is independent of transmissions, in the time interval, of a PUCCH in the second PUCCH group.
10. The wireless device of claim 9 , wherein the instructions, when executed, further cause the wireless device to receive SRS configuration parameters comprising an SRS bandwidth parameter and an SRS subframe configuration parameter.
11. The wireless device of claim 9 , wherein the wireless device is not uplink power limited in the time interval.
12. The wireless device of claim 9 , wherein the sounding procedure comprises a first procedure for transmitting one or more SRSs and a second procedure for dropping transmission of one or more SRSs.
13. The wireless device of claim 9 , wherein the instructions, when executed, further cause the wireless device to:
transmit a first SRS via a first cell of the first PUCCH group in parallel with a first data packet via a second cell of the second PUCCH group; and
drop a configured transmission of a second SRS on the first cell when a second data packet is transmitted via a third cell of the first PUCCH group in parallel with the configured transmission of the second SRS.
14. The wireless device of claim 9 , wherein the instructions, when executed, further cause the wireless device to:
transmit a first SRS on a first cell of the first PUCCH group in parallel with a first PUCCH signal via a second cell of the second PUCCH group; and
drop a configured transmission of a second SRS on the first cell when a second PUCCH signal is transmitted via a third cell of the first PUCCH group in parallel with the configured transmission of the second SRS.
15. The wireless device of claim 9 , wherein the instructions, when executed, further cause the wireless device to:
trigger an SRS type 1 transmission in response to a message; or
trigger an SRS type 2 transmission in response to downlink control information transmitted via a downlink physical channel.
16. The wireless device of claim 9 , wherein the cells comprise a primary cell and one or more secondary cells.