Random Access Channel Configuration of a Base Station

1 . A method comprising:

receiving, by a first base station from a second base station, cell information of a second cell of the second base station, wherein the cell information indicates a subcarrier spacing associated with the second cell; and

transmitting, by the first base station to a wireless device and after receiving the cell information of the second cell, configuration parameters for a random access channel of a first cell of the first base station.

2 . The method of claim 1 , wherein the subcarrier spacing is associated with a bandwidth part of the second cell.

3 . The method of claim 1 , wherein the subcarrier spacing is associated with an initial bandwidth part of the second cell.

4 . The method of claim 1 , wherein the subcarrier spacing is associated with a random access resource of the second cell.

5 . The method of claim 1 , wherein the configuration parameters comprise a first subcarrier spacing associated with the first cell of the first base station and based on the subcarrier spacing associated with the second cell.

6 . The method of claim 1 , further comprising receiving, by the first base station from the wireless device, a random access preamble via the random access channel.

7 . A first base station comprising:

one or more processors; and

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

receive, from a second base station, cell information of a second cell of the second base station, wherein the cell information indicates a subcarrier spacing associated with the second cell; and

transmit, to a wireless device and after receiving the cell information of the second cell, configuration parameters for a random access channel of a first cell of the first base station.

8 . The first base station of claim 7 , wherein the subcarrier spacing is associated with a bandwidth part of the second cell.

9 . The first base station of claim 7 , wherein the subcarrier spacing is associated with an initial bandwidth part of the second cell.

10 . The first base station of claim 7 , wherein the subcarrier spacing is associated with a random access resource of the second cell.

11 . The first base station of claim 7 , wherein the configuration parameters comprise a first subcarrier spacing associated with the first cell of the first base station and based on the subcarrier spacing associated with the second cell.

12 . The first base station of claim 7 , wherein the instructions further cause the wireless device to receive, from the wireless device, a random access preamble via the random access channel.

13 . A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a first base station, cause the first base station to:

receive, from a second base station, cell information of a second cell of the second base station, wherein the cell information indicates a subcarrier spacing associated with the second cell; and

transmit, to a wireless device and after receiving the cell information of the second cell, configuration parameters for a random access channel of a first cell of the first base station.

14 . The non-transitory computer-readable medium of claim 13 , wherein the subcarrier spacing is associated with a bandwidth part of the second cell.

15 . The non-transitory computer-readable medium of claim 13 , wherein the subcarrier spacing is associated with an initial bandwidth part of the second cell.

16 . The non-transitory computer-readable medium of claim 13 , wherein the subcarrier spacing is associated with a random access resource of the second cell.

17 . The non-transitory computer-readable medium of claim 13 , wherein the cell information comprises at least one of:

a cell identifier of the second cell; or

frequency information of a random access resource of the second cell, wherein the frequency information of the random access resource comprises at least one of:

a parameter indicating a frequency offset; or

a parameter indicating a bandwidth.

18 . The non-transitory computer-readable medium of claim 13 , wherein the configuration parameters comprise a first subcarrier spacing associated with the first cell of the first base station and based on the subcarrier spacing associated with the second cell.

19 . The non-transitory computer-readable medium of claim 13 , wherein the instructions further cause the first base station to receive, from the wireless device, a random access preamble via the random access channel.

20 . The non-transitory computer-readable medium of claim 13 , wherein the instructions further cause the first base station to transmit, to the second base station, the configuration parameters for the random access channel of the first cell.