Uplink Spatial Filter Configuration for Beam Failure Recovery

The patent applies preliminary action by having the terminal equipment proactively switch to a spatial domain transmission filter that was used during beam failure recovery or downlink reference signal reception, before actual uplink transmission occurs. This pre-positioning of the correct filter ensures reliability is maintained from the start of uplink transmission after beam failure recovery, rather than waiting for failure to occur and then correcting.

The patent merges the management of spatial domain transmission filters by associating the filter used during beam failure recovery with the subsequent uplink transmission process. Instead of treating them as separate operations requiring independent filter management, the solution combines them by reusing the same filter configuration, thereby reducing overall management complexity while maintaining reliability.

The patent applies parameter changes by precisely defining the time period parameter for filter usage. Specifically, it establishes that the spatial domain transmission filter should be used during a defined period starting from beam failure recovery completion and ending before activation or reconfiguration signaling is received. This parameter specification ensures both ease of operation through clear guidelines and reliability by preventing transmission errors from incorrect filter usage.