Sounding reference signal transmission in a wireless network
View Patent ↗A wireless device receives a downlink control information (DCI) indicating uplink resources in one or more subframes. The DCI comprises a field indicating a position of a subframe in the one or more subframes for transmission of a sounding reference signal (SRS). The wireless device transmits the SRS in the subframe.
1. A method comprising:
receiving, by a wireless device, one or more radio resource control (RRC) messages comprising configuration parameters for a licensed assisted access (LAA) cell, the configuration parameters comprising one or more sounding reference signal (SRS) parameters;
receiving a downlink control information (DCI) indicating uplink resources in a plurality of consecutive subframes of the LAA cell for transmission of transport blocks (TBs) by the wireless device, the DCI comprising:
a first field indicating the number of the plurality of consecutive subframes for transmission of the TBs by the wireless device; and
a second field indicating which subframe, of the plurality of consecutive subframes for transmission of TBs by the wireless device, is for transmission of an SRS; and
transmitting the SRS in the subframe of the LAA cell based on the wireless device being allowed to transmit in the subframe according to a listen before talk procedure.
2. The method of claim 1 , wherein the SRS is transmitted in more than one symbol of the subframe.
3. The method of claim 1 , wherein the one or more SRS parameters comprise an aperiodic SRS configuration parameter.
4. The method of claim 1 , wherein the SRS is transmitted in a last symbol of the subframe.
5. The method of claim 1 , wherein the second field indicates an offset from a starting subframe of the plurality of consecutive subframes.
6. The method of claim 1 , wherein the DCI indicates whether an SRS transmission in the plurality of consecutive subframes is triggered.
7. The method of claim 1 , wherein the one or more SRS parameters comprise one or more common SRS parameters and one or more dedicated SRS parameters.
8. The method of claim 1 , further comprising transmitting one or more transport blocks in the subframe.
9. The method of claim 1 , wherein the SRS is transmitted in a last symbol of the subframe.
10. The method of claim 1 , wherein the DCI further comprises a transmit power control (TPC) command employed, at least in part, for calculating a transmit power for the SRS.
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 one or more radio resource control (RRC) messages comprising configuration parameters for a licensed assisted access (LAA) cell, the configuration parameters comprising one or more sounding reference signal (SRS) parameters;
receive a downlink control information (DCI) indicating uplink resources in a plurality of consecutive subframes of the LAA cell for transmission of transport block (TBs) by the wireless device, the DCI comprising:
a first field indicating the number of the plurality of consecutive subframes for transmission of the TBs by the wireless device; and
a second field indicating which subframe, of the plurality of consecutive subframes for transmission of TBs by the wireless device, is for transmission of an SRS; and
transmit the SRS in the subframe of the LAA cell based on the wireless device being allowed to transmit in the subframe according to a listen before talk procedure.
12. The wireless device of claim 11 , wherein the SRS is transmitted in more than one symbol of the subframe.
13. The wireless device of claim 11 , wherein the one or more SRS parameters comprise an aperiodic SRS configuration parameter.
14. The wireless device of claim 11 , wherein the SRS is transmitted in a last symbol of the subframe.
15. The wireless device of claim 11 , wherein the second field indicates an offset from a starting subframe of the plurality of consecutive subframes.
16. The wireless device of claim 11 , wherein the DCI indicates whether an SRS transmission in the plurality of consecutive subframes is triggered.
17. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to transmit one or more transport blocks in the subframe.
18. The wireless device of claim 11 , wherein the DCI further comprises a transmit power control (TPC) command employed, at least in part, for calculating a transmit power for the SRS.
19. A method comprising:
transmitting, by a base station, a downlink control information (DCI) indicating uplink resources in a plurality of consecutive subframes of a licensed assisted access (LAA) cell for transmission of transport blocks (TBs) by a wireless device, the DCI comprising:
a first field indicating the number of the plurality of consecutive subframes for transmission of the TBs by the wireless device; and
a second field indicating which subframe, of the plurality of consecutive subframes for transmission of TBs by the wireless device, is for transmission of an SRS; and
receiving, by the base station from the wireless device, the SRS in the subframe of the LAA cell based on the wireless being allowed to transmit in the subframe according to a listen before talk procedure.
20. The method of claim 19 , wherein the SRS is received in a last symbol of the subframe.