A wireless device may receive at least one message from a base station. The at least one message may comprise configuration parameters. The configuration parameters may indicate periodic resources of a configured grant. The configured grant may be configured in an uplink bandwidth part. The configuration parameters may indicate a timer value of a bandwidth part inactivity timer. The bandwidth part inactivity timer may be started in response to activating a downlink bandwidth part. One or more data packets may be transmitted via a first transmission interval of a first resource of the periodic resources of the uplink bandwidth part. The bandwidth part inactivity timer may be restarted at a time based on the first transmission interval. In response to an expiry of the bandwidth part inactivity timer, the wireless device may switch from the downlink bandwidth part to a default bandwidth part as an active bandwidth part.