Beam Failure Recovery Using BFD-RS Pools and MAC CE Activation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently detecting and recovering from beam failures, particularly in high-frequency bands like mmWave, where directional beams are used, leading to potential service interruptions.
Innovation Solution
Implementing a method for beam failure recovery by configuring a pool of reference signal resource indexes for beam failure detection and using medium access control elements and control resource sets with transmission configuration information to enhance detection and recovery processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If directional beams are used in high-frequency bands, then beamforming gain and capacity are improved, but service interruptions occur due to beam failures
Solution Approach 1:
The system pre-configures multiple reference signal resource indexes in a pool before beam failure occurs. When beam failure is detected, the UE can immediately switch to a pre-prepared alternative reference signal without service interruption, thus maintaining service continuity while using directional beams for high gain.
Solution Approach 2:
The invention dynamically changes the reference signal resource index parameter when beam failure is detected. By switching from a failed reference signal resource to an alternative one from the pre-configured pool, the system maintains reliable communication while preserving the beamforming gain benefits.
2Measurement precision
If multiple reference signal resource indexes are configured for beam failure detection, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The pool of reference signal resource indexes serves multiple functions: it is used for beam failure detection, for beam recovery, and for maintaining service continuity. This multi-functionality improves detection accuracy without proportionally increasing complexity, as the same resource pool supports multiple critical operations.
Solution Approach 2:
The patent introduces MAC CE commands as an intermediary mechanism to activate specific reference signal resources from the pool. This intermediary simplifies the complexity by providing a standardized, efficient activation method rather than requiring complex individual configuration and management of each reference signal resource.
3Speed
If MAC CE commands are used for BFD-RS activation, then beam failure recovery speed is improved, but signaling overhead increases
Solution Approach 1:
The invention extracts and separates the beam failure recovery signaling from the main RRC configuration signaling. By using MAC CE commands specifically for BFD-RS activation, the system achieves fast recovery speed through dedicated, streamlined signaling that can be processed quickly without the overhead of full RRC reconfiguration.
Solution Approach 2:
The reference signal resource pool is pre-configured via RRC signaling before beam failure occurs. When failure is detected, only a lightweight MAC CE command is needed to activate the appropriate resource, rather than performing full reconfiguration. This preliminary setup reduces the signaling overhead required during actual recovery.
Data Source
AI summary
Methods and apparatus for beam failure recovery in a wireless communication system. A method of operating a user equipment (UE) is includes receiving, in a radio resource control (RRC) signaling, a pool of one or more reference signal (RS) resource indexes for a beam failure detection RS (BFD-RS) configuration; receiving a medium access control control element (MAC CE) command for BFD-RS activation; and receiving a control resource set (CORESET) with one or two transmission configuration information (TCI) states. The method further includes determining, based on the MAC CE command, a first set of one or more RS resource indexes for beam failure detection and determining, based on the one or two TCI states for the CORESET, one or more RS resource indexes in a second set of one or more RS resource indexes for beam failure detection.