Multi-TRP Beam Failure Recovery Using Secondary TRP Assistance
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Solution Overview
Problem
In Mode 2 multi-TRP operation of wireless communication systems, the process of beam failure detection and recovery is complex and resource-intensive, particularly when strong candidate beams with sufficient link quality are unavailable, leading to longer delays and increased resource requirements compared to Mode 1 operation.
Innovation Solution
The system allows a UE to recover and reconfigure a failed PDCCH beam of a first TRP using a second TRP with a working PDCCH in the same serving cell, by transmitting a beam failure indication to the base station, which then reconfigures the PDCCH serving beams based on this indication, thereby reducing the need for additional resources and recovery time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure recovery is performed using traditional methods in Mode 2 multi-TRP operation, then the PDCCH beam can be recovered, but the recovery process is complex and resource-intensive with longer delays
Solution Approach 1:
The patent introduces a secondary TRP as an intermediary to assist in the beam failure recovery process of the primary TRP. When the primary TRP experiences beam failure, the secondary TRP transmits PDCCH messages to the UE, enabling recovery without requiring complex procedures at the primary TRP. This mediator approach simplifies the overall recovery process while maintaining reliability.
Solution Approach 2:
The secondary TRP is configured to perform multiple functions: normal data transmission and beam failure recovery assistance. By making the secondary TRP universal in its capabilities, the system avoids the need for dedicated recovery-only resources, reducing overall system complexity while maintaining recovery reliability.
2Reliability
If beam failure recovery is performed using traditional methods in Mode 2 multi-TRP operation, then the PDCCH beam can be recovered, but additional resources and recovery time are required
Solution Approach 1:
The system performs preliminary configuration of the secondary TRP with beam failure recovery capabilities before actual beam failure occurs. The secondary TRP is pre-configured with candidate beams and recovery parameters, so when beam failure happens, the recovery process can immediately utilize these pre-prepared resources, significantly reducing recovery time.
Solution Approach 2:
The secondary TRP autonomously performs the beam failure recovery transmission without requiring complex coordination or additional signaling from the primary TRP. The secondary TRP independently transmits PDCCH messages using its own resources, eliminating the need for additional inter-TRP signaling and reducing overall recovery time.
3Productivity
If separate PDCCH and PDSCH beams are used for each TRP in Mode 2 operation, then capacity is increased, but beam failure detection and recovery becomes more complex
Solution Approach 1:
The patent merges the beam failure recovery functionality of the primary TRP with the transmission capabilities of the secondary TRP. Instead of treating them as separate independent systems requiring separate tracking, the recovery process combines resources from both TRPs, allowing the UE to receive PDCCH from the secondary TRP during recovery, thereby reducing the tracking complexity while preserving the capacity benefits of Mode 2 operation.
Data Source
AI summary
Aspects are provided which enhance Mode 2 multi-TRP operation by allowing a UE to recover and reconfigure a failed PDCCH beam of a first TRP in a serving cell by using a second TRP which still has a working PDCCH in the same serving cell. If the first TRP undergoes beam failure but the second TRP in the same cell has an operational beam, the UE may send a beam failure indication indicating a new beam for the PDCCH of the first TRP. The base station comprising the second TRP may then reconfigure the PDCCH serving beams of the first TRP based on the beam failure indication. The reliability of a serving cell may thus be increased.