Sounding reference signal subframe position in a plurality of scheduled consecutive subframes
A wireless device receives a radio resource control message comprising an aperiodic sounding reference signal (SRS) subframe parameter. A downlink control information is received. The downlink control information indicates uplink resources in a plurality of scheduled consecutive subframes for transmission of transport blocks by the wireless device and triggers an SRS transmission in a subframe of the plurality of scheduled consecutive subframes. The SRS is transmitted in the subframe. A position of the subframe in the plurality of scheduled consecutive subframes is determined based on the aperiodic SRS subframe parameter.
1. A method comprising:
receiving, by a wireless device, a radio resource control message comprising one or more sounding reference signal (SRS) subframe parameters;
receiving a downlink control information:
indicating uplink resources in a plurality of scheduled subframes for transmission of transport blocks by the wireless device; and
triggering an SRS transmission in a subframe of the plurality of scheduled subframes; and
transmitting the SRS in the subframe, wherein a position of the subframe in the plurality of scheduled subframes is determined based on a field in the downlink control information in a case where the field indicates the position, or is otherwise determined based on an aperiodic SRS subframe parameter included in the one or more SRS subframe parameters.
2. The method of claim 1 , wherein the downlink control information comprises a first field indicating a number of the plurality of scheduled subframes.
3. The method of claim 1 , wherein the SRS is transmitted in more than one symbol of the subframe.
4. The method of claim 1 , wherein the aperiodic SRS subframe parameter indicates an offset from a starting subframe of the plurality of scheduled subframes.
5. The method of claim 1 , wherein the downlink control information comprises a listen-before-talk (LBT) configuration for an LBT procedure.
6. The method of claim 5 , wherein the SRS is based on the LBT procedure indicating a clear channel.
7. The method of claim 5 , wherein the LBT configuration indicates a symbol time interval is employed for the LBT procedure.
8. The method of claim 1 , wherein the downlink control information further comprises a field indicating whether transmission of the SRS is triggered.
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 one or more SRS subframe parameters comprise one or more common SRS parameters and one or more dedicated SRS parameters.
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 a radio resource control message comprising one or more sounding reference signal (SRS) subframe parameter;
receive a downlink control information:
indicating uplink resources in a plurality of scheduled subframes for transmission of transport blocks by the wireless device; and
triggering an SRS transmission in a subframe of the plurality of scheduled subframes; and
transmit the SRS in the subframe, wherein a position of the subframe in the plurality of scheduled subframes is based on a field in the downlink control information in a case where the field indicates the position, or is otherwise determined based on an aperiodic SRS subframe parameter included in the one or more SRS subframe parameters.
12. The wireless device of claim 11 , wherein the downlink control information comprises a first field indicating a number of the plurality of scheduled subframes.
13. The wireless device of claim 11 , wherein the SRS is transmitted in more than one symbol of the subframe.
14. The wireless device of claim 11 , wherein the aperiodic SRS subframe parameter indicates an offset from a starting subframe of the plurality of scheduled subframes.
15. The wireless device of claim 11 , wherein the downlink control information comprises a listen-before-talk (LBT) configuration for an LBT procedure.
16. The wireless device of claim 15 , wherein the SRS is based on the LBT procedure indicating a clear channel.
17. The wireless device of claim 15 , wherein the LBT configuration indicates a symbol time interval is employed for the LBT procedure.
18. The wireless device of claim 11 , wherein the downlink control information further comprises a field indicating whether transmission of the SRS is triggered.
19. The wireless device of claim 11 , wherein the SRS is transmitted in a last symbol of the subframe.
20. A system comprising:
a base station comprising:
one or more first processors; and
first memory storing first instructions that, when executed by the one or more first processors, cause the base station to:
transmit a radio resource control message comprising one or more sounding reference signal (SRS) subframe parameters;
transmit a downlink control information; and
a wireless device comprising:
one or more second processors; and
second memory storing second instructions that, when executed by the one or more second processors, cause the wireless device to:
receive the radio resource control message;
receive the downlink control information, wherein the downlink control information:
indicates uplink resources in a plurality of scheduled subframes for transmission of transport blocks by the wireless device; and
triggers an SRS transmission in a subframe of the plurality of scheduled subframes; and
transmit the SRS in the subframe, wherein a position of the subframe in the plurality of scheduled subframes is determined based on a field in the downlink control information in a case where the field indicates the position, or is otherwise determined based on an aperiodic SRS subframe parameter included in the one or more SRS subframe parameters.