Uplink channel transmission in a wireless device and wireless network

1. A method comprising:

receiving, by a wireless device, one or more messages comprising configuration parameters of an unlicensed cell;

receiving, by the wireless device, a downlink control information (DCI) for transmission of one or more transport blocks on the unlicensed cell, the DCI indicating:

a transmit power control (TPC) command; and

a resource blocks (RBs) assignment indicating a first plurality of RBs;

calculating, by the wireless device, a transmission power employing the TPC command, the transmission power employed for transmission of:

an uplink reservation signal; and

the one or more transport blocks via a plurality of physical uplink shared channel (PUSCH) symbols;

performing a listen-before-talk (LBT) procedure to detect whether a channel is available for transmission;

in response to the LBT procedure indicating that the channel is available, transmitting the uplink reservation signal:

with the transmission power;

via subcarriers of the first plurality of RBs; and

until a PUSCH starting symbol; and

transmitting, via the subcarriers of the first plurality of RBs and starting at the PUSCH starting symbol, the one or more transport blocks with the transmission power.

2. The method of claim 1 , wherein the uplink reservation signal is transmitted only at a beginning subframe of an uplink burst comprising one or more subframes.

3. The method of claim 1 , wherein the uplink reservation signal has a predetermined format.

4. The method of claim 1 , further comprising receiving, from a base station, an indication configuring a starting time for the uplink reservation signal.

5. The method of claim 1 , wherein the DCI further indicates the PUSCH starting symbol.

6. The method of claim 1 , wherein the one or more messages comprise one or more uplink power control parameters.

7. The method of claim 1 , wherein the calculating the transmission power further comprises adjusting a power of the uplink reservation signal and the plurality of PUSCH symbols with a same adjusting factor.

8. A method comprising;

receiving, by a wireless device, one or more messages comprising configuration parameters of an unlicensed cell;

receiving, by the wireless device, a downlink control information (DCI) for transmission of one or more transport blocks on the unlicensed cell, the DCI indicating:

a transmit power control (TPC) command; and

a resource blocks (RBs) assignment indicating a first plurality of RBs;

performing a listen-before-talk (LBT) procedure to detect whether a channel is available for transmission;

in response to the LBT procedure indicating that the channel is available, transmitting an uplink reservation signal:

with a reservation signal transmission power based on the TPC command;

via subcarriers of the first plurality of RBs; and

until a physical uplink shared channel (PUSCH) starting symbol; and

transmitting, via the subcarriers of the first plurality of RBs and starting at the PUSCH starting symbol, the one or more transport blocks with a PUSCH transmission power; and

wherein the reservation signal transmission power is equal to the PUSCH transmission power.

9. The method of claim 8 , wherein the uplink reservation signal is transmitted only at a beginning subframe of an uplink burst comprising one or more subframes.

10. The method of claim 8 , wherein the uplink reservation signal has a predetermined format.

11. The method of claim 8 , further comprising receiving, from a base station, an indication configuring a starting time for the uplink reservation signal.

12. The method of claim 8 , wherein the DCI further indicates the PUSCH starting symbol.

13. The method of claim 8 , wherein the one or more messages comprise one or more uplink power control parameters.

14. 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 of an unlicensed cell;

receive a downlink control information (DCI) for transmission of one or more transport blocks on the unlicensed cell, the DCI indicating:

a transmit power control (TPC) command; and

a resource blocks (RBs) assignment indicating a first plurality of RBs;

calculate a transmission power employing the TPC command, the transmission power employed for transmission of:

an uplink reservation signal; and

the one or more transport blocks via a plurality of physical uplink shared channel (PUSCH) symbols;

perform a listen-before-talk (LBT) procedure to detect whether a channel is available for transmission;

in response to the LBT procedure indicating that the channel is available, transmit the uplink reservation signal:

with the transmission power;

via subcarriers of the first plurality of RBs; and

until a PUSCH starting symbol; and

transmit, via the subcarriers of the first plurality of RBs and starting at the PUSCH starting symbol, the one or more transport blocks with the transmission power.

15. The wireless device of claim 14 , wherein the uplink reservation signal is transmitted only at a beginning subframe of an uplink burst comprising one or more subframes.

16. The wireless device of claim 14 , wherein the uplink reservation signal has a predetermined format.

17. The wireless device of claim 14 , further comprising receiving, from a base station, an indication configuring a starting time for the uplink reservation signal.

18. The wireless device of claim 14 , wherein the DCI further indicates the PUSCH starting symbol.

19. The wireless device of claim 14 , wherein the one or more messages comprise one or more uplink power control parameters.

20. The wireless device of claim 14 , wherein the calculating a transmission power further comprises adjusting a power of the uplink reservation signal and the plurality of PUSCH symbols with a same adjusting factor.