UE-Requested BFD/BFR Reference Signal Beam Management
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently detecting and recovering from beam failures due to obstructions, leading to potential radio link failures and disruptions in service.
Innovation Solution
A method where user equipment (UE) requests and receives lists of beams for beam failure detection (BFD) and beam failure recovery (BFR) from a base station, allowing it to switch to alternative beams if the serving beam is obstructed, using predefined threshold measurements and timers to initiate random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE uses a fixed RS beam set configured by the base station for BFD and BFR, then the system operation is simplified, but the UE cannot adapt to beam obstructions caused by movements, rotations, or interference patterns
Solution Approach 1:
The UE performs measurements on beams outside the configured RS beam sets before beam failure occurs, identifying potential alternative beams in advance. This preliminary action allows the UE to quickly switch to pre-identified beams when obstruction occurs, improving adaptability without adding complex real-time decision mechanisms.
Solution Approach 2:
The UE autonomously determines beam failure based on measurements and independently selects alternative beams from outside the configured RS beam sets. The base station simply provides the configured beam sets, while the UE handles the complex task of identifying and switching to alternative beams, reducing base station complexity while improving system adaptability.
2Reliability
If the UE monitors only the configured RS beam sets for beam failure detection, then the measurement process is simplified, but the UE cannot detect beam failures caused by obstructions that affect only the configured beams
Solution Approach 1:
The UE performs measurements on beams outside the configured RS beam sets as a preliminary step to establish a baseline of alternative beam qualities. This allows the UE to detect when configured beams fail and immediately identify suitable alternatives without complex real-time analysis, improving detection reliability while keeping the measurement process manageable.
Solution Approach 2:
The UE expands the measurement space from only configured RS beam sets to include additional beams outside this set. By measuring in this extended dimensional space, the UE can detect beam failures more reliably and identify alternatives, trading increased measurement complexity for significantly improved detection accuracy.
3Adaptability or versatility
If the base station configures the UE with RS beam sets for BFD and BFR, then the system maintains control over beam selection, but the UE cannot utilize suitable alternative beams that are not in the configured sets
Solution Approach 1:
The UE identifies and evaluates alternative beams outside the configured RS beam sets in advance, preparing a list of potential alternatives. When beam failure occurs, the UE can immediately propose these pre-identified beams to the base station, ensuring that suitable beam options are not lost while maintaining base station control over the final selection.
Solution Approach 2:
The UE acts as an intermediary by measuring and identifying alternative beams, then presenting these options to the base station for approval. This intermediary role allows the system to maintain base station control while expanding the pool of available beam options, preventing loss of beam information while preserving system authority.
4Reliability
If the UE switches to alternative beams outside the RS beam sets, then the system recovers from beam failure more effectively, but the beam management procedure becomes more complex
Solution Approach 1:
The UE performs measurements and identifies alternative beams before beam failure occurs, preparing recovery options in advance. This preliminary action simplifies the actual recovery process, as the UE already has identified alternatives ready to propose, reducing the complexity of real-time beam management while improving recovery success rate.
Solution Approach 2:
The UE autonomously identifies alternative beams and initiates the proposal process to the base station, handling the complex measurement and selection tasks independently. This self-service approach improves beam recovery effectiveness while keeping base station involvement relatively simple, as the base station primarily needs to receive and approve the UE's beam proposals.
Data Source
AI summary
This disclosure provides systems, devices, apparatus and methods, including computer programs encoded on storage media, for a UE-requested BFD/BFR reference signal. In aspects, the UE may transmit, to a base station, a request for a list of a set of beams for BFD and a list of a set of candidate beams for BFR. The UE may receive, from the base station based on the transmitted request, information indicating the set of beams for BFD and the set of candidate beams for BFR.