TRP-Specific Beam Failure Recovery in Multi-TRP Wireless Systems
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Solution Overview
Problem
In wireless communication systems, existing technologies face challenges in efficiently recovering from beam failures between user equipment (UE) and base stations due to changes in the radio environment, leading to communication failures, especially when multiple transmission reception points (TRPs) are involved.
Innovation Solution
A method and apparatus for TRP-specific beam failure detection and recovery, where a scheduled entity receives TRP-specific beam failure detection reference signals and identifiers, allowing it to trigger a beam failure recovery process only for the affected TRP, rather than replacing the entire set of active beams, by using TRP identifiers to differentiate and manage beam failures on a per-TRP basis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE triggers beam failure recovery for the entire cell when any beam fails, then communication reliability is maintained, but resource usage and processing time increase unnecessarily
Solution Approach 1:
The patent segments the beam failure recovery process by introducing TRP-specific identification. Instead of treating all beam failures uniformly at the cell level, the system divides recovery procedures into TRP-specific segments. Each TRP can be independently identified and managed, allowing selective recovery of only the affected TRP's beams rather than triggering a full cell-wide recovery process.
2Reliability
If the UE triggers beam failure recovery for the entire cell when any beam fails, then communication reliability is maintained, but resource usage increases
Solution Approach 1:
The patent segments the beam failure recovery process by introducing TRP-specific identification. Instead of treating all beam failures uniformly at the cell level, the system divides recovery procedures into TRP-specific segments. Each TRP can be independently identified and managed, allowing selective recovery of only the affected TRP's beams rather than triggering a full cell-wide recovery process.
3Productivity
If TRP-specific beam failure detection is implemented, then resource efficiency improves, but device complexity increases
Solution Approach 1:
The patent implements universality by designing a multi-functional TRP identification mechanism that serves multiple purposes. The same TRP identification framework is used for both downlink beam management and uplink beam failure recovery triggering. This universal approach allows the system to handle different TRP scenarios (single TRP, multiple TRPs, primary and secondary TRPs) using a unified methodology, thereby managing complexity through standardization rather than requiring separate mechanisms for each scenario.
Data Source
AI summary
A plurality of scheduled entities, such as transmission reception points (TRPs), may each transmit at least one TRP-specific beam failure detection reference signal (BFD-RS) having a corresponding TRP identifier (ID) to a scheduled entity. The scheduled entity may be configured with at least one TRP-specific medium access control (MAC) parameter. The scheduled entity may receive the TRP-specific BFD-RSs and respective TRP IDs associated therewith. The scheduled entity may measure each BFD-RSs and count beam failure instances associated with each TRP ID. The scheduled entity may transmit a beam failure recovery request (BFRQ) associated with the respective TRP ID in response to a predetermined quantity of respective TRP-specific BFD-RS measurements of at least one of the respective TRP-specific BFD-RSs being less than a predetermined value. A scheduling entity may receive the BFRQ, where the at least one TRP-specific MAC parameter was used to trigger the BFRQ.