Energy detection threshold in a wireless device and wireless network
A wireless device receives one or more downlink control information (DCI) comprising transmission parameters for a plurality of signals and one or more power control commands. The wireless device calculates a transmission power of each of the plurality of signals employing the one or more power control commands. The wireless device calculates an energy detection threshold based, at least in part, on the transmission power of the plurality of signals. The wireless device performs a listen before talk (LBT) procedure employing the energy detection threshold.
1. A method comprising:
receiving one or more messages comprising configuration parameters for a licensed assisted access (LAA) cell;
receiving one or more downlink control information (DCI) comprising:
transmission parameters for a plurality of consecutive signals, wherein each of the plurality of consecutive signals is for transmission via the LAA cell; and
one or more power control commands for the plurality of consecutive signals;
calculating a plurality of transmission powers for the plurality of consecutive signals for transmission via the LAA cell employing the one or more power control commands and a pathloss value for the LAA cell;
calculating a plurality of energy detection thresholds, each being based on a corresponding transmission power of the plurality of transmission powers for the plurality of consecutive signals for transmission via the LAA cell;
performing a listen before talk (LBT) procedure employing a minimum energy detection threshold of the plurality of calculated energy detection thresholds; and
transmitting, via the LAA cell, the plurality of consecutive signals if the LBT procedure indicates a clear channel.
2. The method of claim 1 , wherein:
the configuration parameters comprise one or more LBT configuration parameters for the LAA cell; and
the calculating the energy detection threshold further employs the one or more LBT configuration parameters.
3. The method of claim 1 , wherein the plurality of consecutive signals comprise one or more sounding reference signals (SRSs).
4. The method of claim 1 , wherein the plurality of consecutive signals comprise one or more physical uplink control channels (PUCCHs).
5. The method of claim 1 , wherein the calculating the energy detection threshold employs a maximum of the plurality of transmission powers for the plurality of consecutive signals.
6. The method of claim 1 , wherein the calculating the energy detection threshold employs a first transmission power of a first signal in the plurality of consecutive signals.
7. The method of claim 1 , wherein the calculating the energy detection threshold employs a maximum of:
a first transmission power of a first signal in the plurality of consecutive signals; and
a maximum of the plurality of transmission powers for the plurality of consecutive signals.
8. The method of claim 1 , wherein the plurality of consecutive signals are transmitted in a subframe.
9. The method of claim 1 , wherein the plurality of consecutive signals are transmitted in an uplink burst comprising a plurality of subframes.
10. The method of claim 1 , wherein the one or more DCI comprise a multi-subframe grant.
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 messages comprising configuration parameters for a licensed assisted access (LAA) cell;
receive one or more downlink control information (DCI) comprising:
transmission parameters for a plurality of consecutive signals, wherein each of the plurality of consecutive signals is for transmission via the LAA cell; and
one or more power control commands for the plurality of consecutive signals;
calculate a transmission powers for the plurality of consecutive signals for transmission via the LAA cell employing the one or more power control commands and a pathloss value for the LAA cell;
calculate a plurality of energy detection thresholds, each being based on a corresponding transmission power of the plurality of transmission powers for the plurality of consecutive signals for transmission via the LAA cell;
perform a listen before talk (LBT) procedure employing a minimum energy detection threshold of the plurality of calculated energy detection thresholds; and
transmitting the plurality of consecutive signals if the LBT procedure indicates a clear channel.
12. The wireless device of claim 11 , wherein:
the configuration parameters comprise one or more LBT configuration parameters for the LAA cell; and
the instructions, when executed by the one or more processors, further cause the wireless device to calculate the energy detection threshold further employing the one or more LBT configuration parameters.
13. The wireless device of claim 11 , wherein the plurality of consecutive signals comprise one or more sounding reference signals (SRSs).
14. The wireless device of claim 11 , wherein the plurality of consecutive signals comprise one or more physical uplink control channels (PUCCHs).
15. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to calculate the energy detection threshold employing a maximum of the plurality of transmission powers for the plurality of consecutive signals.
16. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to calculate the energy detection threshold employing a first transmission power of a first signal in the plurality of consecutive signals.
17. The wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to calculate the energy detection threshold employing a maximum of:
a first transmission power of a first signal in the plurality of consecutive signals; and
a maximum of the plurality of transmission powers for the plurality of consecutive signals.
18. The wireless device of claim 11 , wherein the plurality of consecutive signals are transmitted in a subframe.
19. The wireless device of claim 11 , wherein the plurality of consecutive signals are transmitted in an uplink burst comprising a plurality of subframes.
20. The wireless device of claim 11 , wherein the one or more DCI comprise a multi-subframe grant.