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US 11,115,966 B2Granted
Beam failure recovery procedures using bandwidth parts
AssigneeComcast Cable Communications, LLC
InventorsAli Cirik, Esmael Hejazi Dinan, Hua Zhou, Hyoungsuk Jeon, Alireza Babaei
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Abstract
Systems, apparatuses, and methods are described for wireless communications. A wireless device may initiate a beam failure recovery (BFR) procedure using a bandwidth part (BWP) on a secondary cell. Based on initiating a random access procedure for the BFR procedure and/or based on unsuccessfully completing the BFR procedure, the wireless device may perform one or more operations to prevent and/or reduce misalignment between the wireless device and a base station.
Claims20
A method comprising:
- receiving, by a wireless device, one or more configuration parameters for a secondary cell, wherein the one or more configuration parameters indicate a plurality of bandwidth parts (BWPs) comprising a first BWP and a second BWP;
- switching an active BWP of the secondary cell to the first BWP;
- transmitting a preamble associated with a random access procedure for the secondary cell;
- determining based on a quantity of uplink transmissions, that the random access procedure is unsuccessful;
- and
- based on the determining that the random access procedure is unsuccessful, switching the active BWP of the secondary cell to the second BWP.
3 more elements
A method comprising:
- receiving, by a wireless device, one or more configuration parameters for a secondary cell, wherein the one or more configuration parameters indicate:
- a plurality of bandwidth parts (BWPs) comprising a first BWP and a second BWP;
- and
- a duration for a BWP inactivity timer;
- based on switching an active BWP of the secondary cell to the first BWP, starting the BWP inactivity timer;
- transmitting a preamble associated with a random access procedure for the secondary cell;
- based on the transmitting the preamble associated with the random access procedure for the secondary cell, stopping, prior to the duration, the BWP inactivity timer;
- determining, based on a quantity of uplink transmissions, that the random access procedure is unsuccessful;
- and
- based on the determining that the random access procedure is unsuccessful, performing one or more of:
- restarting the BWP inactivity timer;
- or
- switching the active BWP of the secondary cell to the second BWP.
10 more elements
A method comprising:
- receiving, by a wireless device, one or more configuration parameters for a secondary cell, wherein the one or more configuration parameters indicate:
- a plurality of bandwidth parts (BWPs) comprising a first BWP and a second BWP;
- and
- a duration;
- switching an active BWP of the secondary cell to the first BWP;
- transmitting a preamble associated with a random access procedure for the secondary cell;
- monitoring, based on the duration, for downlink control information (DCI) via a physical downlink control channel (PDCCH) of the first BWP;
- determining, based on a quantity of uplink transmissions, that the random access procedure for the secondary cell is unsuccessful;
- and
- switching, based on a determination that the DCI is not received during the monitoring and based on the determining that the random access procedure for the secondary cell is unsuccessful, the active BWP of the secondary cell to the second BWP.
7 more elements
Dependencies are inferred from the claim text.