Bandwidth Part Activation

An apparatus, comprising:

• at least one processor, wherein the at least one processor is configured to cause a wireless device to:
• at a first time, start or restart a bandwidth part (BWP) activation timer, based at least in part on receiving a first physical downlink control channel (PDCCH), for a first BWP of a plurality of BWPs of a cell, wherein the wireless device performs fallback to a default BWP of the plurality of BWPs of the cell upon expiry of the BWP activation timer, wherein the fallback to the default BWP comprises deactivating the first BWP and activating the default BWP;
• initiate a random access channel (RACH) procedure on the first BWP;
• avoid performing the fallback to the default BWP during the RACH procedure;
• and
• at a second time, complete the RACH procedure on the first BWP, wherein a time difference between the first time and the second time is longer than a length of the BWP activation timer.

A wireless device, comprising:

• wireless communication circuitry;
• and
• at least one processor coupled to the wireless communication circuitry, wherein the at least one processor is configured to cause the wireless device to:
• at a first time, start a bandwidth part (BWP) activation timer, based at least in part on receiving a first physical downlink control channel (PDCCH), for a first BWP of a plurality of BWPs of a cell, wherein the wireless device performs fallback to a default BWP of the plurality of BWPs of the cell upon expiry of the BWP activation timer, wherein the fallback to the default BWP comprises deactivating the first BWP and activating the default BWP;
• initiate a random access channel (RACH) procedure on the first BWP;
• avoid performing the fallback to the default BWP during the RACH procedure;
• at a second time, complete the RACH procedure on the first BWP, wherein a time difference between the first time and the second time is longer than a length of the BWP activation timer;
• and
• when the RACH procedure is successfully completed, restarting the BWP activation timer.