UE Beam Failure Recovery Using MAC-CE Bitmap for DL RS Identification

The patent segments the indication process by separating the Candidate Beam RS list configuration from the actual DL RS identification. The MAC-CE message is divided into multiple parts: a first part indicating a serving cell, a second part indicating a candidate beam RS, and a third part providing additional identification information. This segmentation allows each part to contribute specific information that, when combined, unambiguously identifies the DL RS without confusion.

The patent introduces an intermediary mechanism - the MAC-CE message structure with multiple indication parts - that mediates between the Candidate Beam RS list configuration and the final DL RS identification. This intermediary carries additional information (such as SSB index or CSI-RS resource indicator) that resolves the ambiguity inherent in using only the Candidate Beam RS list configuration.

The patent creates a universal MAC-CE message structure that can indicate candidate beams for multiple serving cells using the same format. Each serving cell is represented by a consistent set of indication parts (first part for cell identity, second part for candidate beam RS, third part for additional information). This universal structure allows the MAC-CE to handle multiple cells without requiring different formats for each cell, managing complexity through standardization.

The patent manages complexity by organizing the MAC-CE structure in a dimensional hierarchy: the first indication part operates at the cell level, the second part at the beam level, and the third part at the resource level. This multi-dimensional organization allows the system to scale to multiple cells by adding more entries along the cell dimension while maintaining the same structural pattern, rather than creating exponentially more complex structures.