Random access and bandwidth part operation
A wireless device receives one or more messages comprising: first configuration parameters of a plurality of cells comprising a primary cell and a secondary cell; and bandwidth part configuration parameters comprising a value for a bandwidth part inactivity timer. A downlink control information is received on an active bandwidth part of the primary cell. The downlink control information indicates a resource assignment. In response to the receiving the downlink control information, a determination is made that no random access procedure is ongoing on the secondary cell. The bandwidth part inactivity timer of the active bandwidth part of the primary cell is started in response to the determining. In response to an expiry of the bandwidth part inactivity timer, a switch is made from the active bandwidth part to a default bandwidth part.
1. A method comprising:
receiving, by a wireless device, one or more messages comprising:
first configuration parameters of a plurality of cells comprising a primary cell and a secondary cell; and
bandwidth part configuration parameters comprising a value for a bandwidth part inactivity timer;
receiving a downlink control information, on an active bandwidth part of the primary cell, indicating a resource assignment;
determining, in response to the receiving the downlink control information, that no random access procedure is ongoing on the secondary cell;
starting the bandwidth part inactivity timer of the active bandwidth part of the primary cell in response to the determining; and
switching from the active bandwidth part to a default bandwidth part in response to an expiry of the bandwidth part inactivity timer.
2. The method of claim 1 , wherein the resource assignment is for an uplink grant or a downlink assignment.
3. The method of claim 2 , wherein the bandwidth part configuration parameters further indicate an initial active bandwidth part.
4. The method of claim 2 , wherein the downlink control information is received via a wireless device specific search space of a downlink control channel.
5. The method of claim 2 , wherein the determining further comprises determining that no random access procedure is ongoing based on no random access preamble being transmitted via the secondary cell.
6. The method of claim 2 , wherein the starting the bandwidth part inactivity timer is with the value.
7. The method of claim 2 , wherein:
the downlink control information has a format for uplink scheduling or downlink scheduling; and
the downlink control information comprises transmission parameters of a transport block, the transmission parameters comprising radio resources and a hybrid automatic repeat request process number.
8. The method of claim 2 , wherein the default bandwidth part is set to an initial active bandwidth part in response to no default bandwidth part being configured.
9. The method of claim 2 , wherein the active bandwidth part has a different numerology than the default bandwidth part.
10. The method of claim 2 , wherein the bandwidth part configuration parameters indicate an identifier of the default bandwidth part.
11. The method of claim 1 , wherein the bandwidth part configuration parameters further indicate an initial active bandwidth part.
12. The method of claim 1 , wherein the downlink control information is received via a wireless device specific search space of a downlink control channel.
13. The method of claim 1 , wherein the determining further comprises determining that no random access procedure is ongoing based on no random access preamble being transmitted via the secondary cell.
14. The method of claim 1 , wherein the starting the bandwidth part inactivity timer is with the value.
15. The method of claim 14 , wherein:
the downlink control information has a format for uplink scheduling or downlink scheduling; and
the downlink control information comprises transmission parameters of a transport block, the transmission parameters comprising radio resources and a hybrid automatic repeat request process number.
16. The method of claim 14 , wherein the default bandwidth part is set to an initial active bandwidth part in response to no default bandwidth part being configured.
17. The method of claim 1 , wherein:
the downlink control information has a format for uplink scheduling or downlink scheduling; and
the downlink control information comprises transmission parameters of a transport block, the transmission parameters comprising radio resources and a hybrid automatic repeat request process number.
18. The method of claim 1 , wherein the default bandwidth part is set to an initial active bandwidth part in response to no default bandwidth part being configured.
19. The method of claim 1 , wherein the active bandwidth part has a different numerology than the default bandwidth part.
20. The method of claim 1 , wherein the bandwidth part configuration parameters indicate an identifier of the default bandwidth part.