Random access response of an uplink bandwidth part of a cell

1. A method comprising:

receiving, by a wireless device from a base station:

at least one configuration parameter of a first uplink bandwidth part of a cell; and

at least one configuration parameter of a random access channel;

transmitting, by the wireless device, a preamble via the random access channel of the first uplink bandwidth part of the cell;

determining a random access radio network temporary identifier (RA-RNTI) based on:

the at least one configuration parameter of the first uplink bandwidth part; and

the at least one configuration parameter of the random access channel;

monitoring a downlink control channel for a downlink control information addressed to the RA-RNTI;

receiving the downlink control information indicating a radio resource of a random access response corresponding to the preamble; and

receiving the random access response via the radio resource.

2. The method of claim 1 , wherein the cell is one of:

a primary cell of a plurality of cells; or a secondary cell of the plurality of cells.

3. The method of claim 1 , wherein the at least one configuration parameter of the first uplink bandwidth part comprises at least one of:

a bandwidth part index of the first uplink bandwidth part; or

a bandwidth value of the first uplink bandwidth part.

4. The method of claim 1 , wherein the transmitting the preamble is in response to receiving a first downlink control information comprising at least one of:

a preamble index identifying the preamble; and

a random access channel index identifying the random access channel.

5. The method of claim 4 , wherein a second uplink bandwidth part is configured with a first bandwidth part configuration parameter and first random access channel parameters of a first random access channel.

6. The method of claim 1 , wherein the at least one configuration parameter of the first uplink bandwidth part comprises a frequency location parameter of the first uplink bandwidth part.

7. The method of claim 6 , wherein the frequency location parameter is a resource block starting position parameter of the first uplink bandwidth part.

8. The method of claim 7 , wherein the resource block starting position parameter comprises an offset value indicating a number of physical resource blocks between a frequency reference point of the cell and a first usable subcarrier of the first uplink bandwidth part.

9. The method of claim 1 , wherein the transmitting the preamble is in response to initiating a contention-based random access procedure.

10. The method of claim 9 , further comprising selecting the first uplink bandwidth part from the first uplink bandwidth part and a second uplink bandwidth part of a plurality of uplink bandwidth parts.

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, from a base station:

at least one configuration parameter of a first uplink bandwidth part of a cell; and

at least one configuration parameter of a random access channel;

transmit a preamble via the random access channel of the first uplink bandwidth part of the cell;

determine a random access radio network temporary identifier (RA-RNTI) based on:

the at least one configuration parameter of the first uplink bandwidth part; and

the at least one configuration parameter of the random access channel;

monitor a downlink control channel for a downlink control information addressed to the RA-RNTI;

receive the downlink control information indicating a radio resource of a random access response corresponding to the preamble; and

receive the random access response via the radio resource.

12. The wireless device of claim 11 , wherein the cell is one of:

a primary cell of a plurality of cells; or

a secondary cell of the plurality of cells.

13. The wireless device of claim 11 , wherein the at least one configuration parameter of the first uplink bandwidth part comprises at least one of:

a bandwidth part index of the first uplink bandwidth part; or

a bandwidth value of the first uplink bandwidth part.

14. The wireless device of claim 11 , wherein the transmission of the preamble is in response to receiving a first downlink control information comprising at least one of:

a preamble index identifying the preamble; and

a random access channel index identifying the random access channel.

15. The wireless device of claim 14 , wherein a second uplink bandwidth part is configured with a first bandwidth part configuration parameter and first random access channel parameters of a first random access channel.

16. The wireless device of claim 11 , wherein the at least one configuration parameter of the first uplink bandwidth part comprises a frequency location parameter of the first uplink bandwidth part.

17. The wireless device of claim 16 , wherein the frequency location parameter is a resource block starting position parameter of the first uplink bandwidth part.

18. The wireless device of claim 17 , wherein the resource block starting position parameter comprises an offset value indicating a number of physical resource blocks between a frequency reference point of the cell and a first usable subcarrier of the first uplink bandwidth part.

19. The wireless device of claim 11 , wherein the transmission of the preamble is in response to initiating a contention-based random access procedure.

20. A system comprising:

a wireless device comprising:

one or more first processors; and

first memory storing first instructions that, when executed by the one or more first processors, cause the wireless device to:

transmit a preamble via a random access channel of a first uplink bandwidth part of a cell;

determine a random access radio network temporary identifier (RA-RNTI) based on:

at least one configuration parameter of the first uplink bandwidth part of a cell; and

at least one configuration parameter of the random access channel;

monitor a downlink control channel for a downlink control information addressed to the RA-RNTI;

receive the downlink control information indicating a radio resource of a random access response corresponding to the preamble; and

receive the random access response via the radio resource; and

a base station comprising:

one or more second processors; and

second memory storing second instructions that, when executed by the one or more second processors, cause the base station to:

transmit to the wireless device:

the at least one configuration parameter of the first uplink bandwidth part of the cell; and

the at least one configuration parameter of the random access channel;

receive the preamble;

transmit the downlink control information; and

transmit the random access response.