/Random Access Procedure For Beam Failure Recovery
Abstract

A wireless device receives one or more radio resource control (RRC) configuration parameters. The RRC configuration parameters include a parameter indicating a timer to avoid triggering a random access (RA) procedure due to a beam failure recovery during an RA-based procedure for small data transmissions. The RRC configuration parameters indicate one or more preambles for the RA-based procedure. The wireless device initiates a first RA-based procedure based on a comparison of a data volume and a respective threshold. The wireless device transmits a first preamble of the one or more preambles for the first RA-based procedure. While the first RA-based procedure is ongoing, the wireless device initiates a first RA procedure based on whether the timer is running and a received signal power being lower than a power threshold. The wireless device transmits a second preamble for the first RA procedure.

Full Text

What is claimed is:

A wireless device receives one or more radio resource control (RRC) configuration parameters. The RRC configuration parameters include a parameter indicating a timer to avoid triggering a random access (RA) procedure due to a beam failure recovery during an RA-based procedure for small data transmissions. The RRC configuration parameters indicate one or more preambles for the RA-based procedure. The wireless device initiates a first RA-based procedure based on a comparison of a data volume and a respective threshold. The wireless device transmits a first preamble of the one or more preambles for the first RA-based procedure. While the first RA-based procedure is ongoing, the wireless device initiates a first RA procedure based on whether the timer is running and a received signal power being lower than a power threshold. The wireless device transmits a second preamble for the first RA procedure.
Timeline
Filed
04/01/2026
Published
08/06/2026
Granted
Not Available
IPC Codes(4)
H04W 74/0833:Random access procedures, e.g. with 4-step access
H04W 72/21:in the uplink direction of a wireless link, i.e. towards the network
H04W 74/0836:with 2-step access