UE Capability Signaling for TRP-Specific Beam Failure Recovery
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Solution Overview
Problem
Existing wireless communication systems, particularly in NR and LTE, lack efficient mechanisms for per-transmission reception point (per-TRP) based beam failure recovery (BFR), leading to sub-optimal performance when all beams in a component carrier become weak, resulting in delayed beam recovery and reduced reliability.
Innovation Solution
Implementing per-TRP based beam failure recovery (BFR) procedures that allow beam recovery when beams for a given TRP become weak, enabling identification of the best beam without waiting for other TRPs, and supporting UE capabilities for TRP-specific BFR through indication and participation in beam group specific BFR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If per-TRP based beam failure recovery procedures are implemented, then beam recovery efficiency and reliability are improved, but device complexity and protocol overhead increase
Solution Approach 1:
The patent segments the beam failure recovery procedure into per-TRP specific operations. Each TRP is monitored independently with separate beam failure detection and recovery processes, allowing the system to handle beam failures at individual TRP level rather than requiring complete system-wide beam failure before initiating recovery procedures.
Solution Approach 2:
The patent implements preliminary actions by configuring multiple candidate beams in advance for each TRP. When beam failure is detected, the UE can immediately switch to a pre-configured candidate beam without waiting for network reconfiguration, significantly reducing recovery time and improving reliability.
2Productivity
If per-TRP beam failure recovery is implemented, then system performance is improved, but information overhead for capability indication increases
Solution Approach 1:
The patent employs universal capability indication mechanisms that can serve multiple purposes. The same capability indication framework is used for both per-TRP beam failure recovery and other beam management functions, reducing redundant information overhead while maintaining comprehensive capability reporting.
Solution Approach 2:
The patent uses parameter changes in capability indication by dynamically adjusting the level of detail based on actual system needs. When per-TRP BFR is activated, detailed capability parameters are indicated; when not needed, simplified indication is used, optimizing the balance between information completeness and overhead reduction.
Data Source
AI summary
Certain aspects of the present disclosure provide enhancements to enable per transmission reception point (per-TRP or per beam group) based beam failure recovery (BFR), and more particularly, techniques for indicating capabilities of a user equipment (UE) to support TRP specific BFR. A method that may be performed by a UE includes transmitting, to a network entity, an indication of one or more capabilities of the UE to support beam group specific BFR, communicating with at least two TRPs using beams associated with at least two beam groups, each of the at least two beam groups associates with one of the at least two TRPs, detecting a beam failure in a beam group of the at least two beam groups, and participating in the beam group specific BFR, in accordance with the indicated one or more capabilities of the UE.