5G NR Control Resource Set Pool Index Updating for Beam Failure Recovery
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Solution Overview
Problem
In the 5G New Radio (NR) system, especially in frequency range 2, beam failures occur due to fast attenuation of high-frequency channels, leading to inconsistencies in control resource set pool indices across transmission reception points (TRPs), which hinders effective communication and beam recovery.
Innovation Solution
A method is introduced to send a beam failure indication from a terminal to a network device, allowing the network to update the control resource set pool index for affected TRPs, ensuring consistent indexing and proper TRP identification for communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure occurs at a TRP in 5G NR system, then communication reliability deteriorates due to inconsistent control resource set pool indices, but updating the indices requires additional signaling overhead and processing complexity
Solution Approach 1:
The network device pre-configures multiple control resource sets with different CORESETPoolIndex values before beam failure occurs. When beam failure is detected, the terminal can immediately switch to a pre-configured control resource set with an updated index without requiring complex real-time index negotiation, thus resolving the contradiction between reliability and complexity.
Solution Approach 2:
The terminal monitors beam quality and provides feedback to the network device about beam failure conditions. Based on this feedback, the network device determines whether to update the CORESETPoolIndex and sends appropriate indication signaling. This feedback mechanism ensures reliable beam recovery while controlling signaling overhead through condition-based updates.
2Reliability
If control resource set pool indices are updated frequently to maintain consistency across TRPs, then communication quality improves, but signaling overhead and processing time increase
Solution Approach 1:
Multiple control resource sets with different CORESETPoolIndex values are pre-configured in advance. When beam failure occurs, the terminal can immediately switch to a pre-configured set with an appropriate index, avoiding time-consuming real-time index negotiation and reducing the time loss associated with frequent updates.
Solution Approach 2:
Instead of updating all control resource set indices systematically, the network device performs partial updates only for affected TRPs or specific control resource sets. This selective update approach maintains consistency where needed while minimizing the time and signaling overhead associated with comprehensive updates.
Data Source
AI summary
A method is provided to update control resource set pool index. The method includes: sending a beam failure indication to a network device on a channel resource of a first TRP, the beam failure indication being used to inform the network device of a beam failure occurred at a second TRP, the second TRP being a default TRP before the beam failure occurs, and the first TRP and the second TRP belonging to a same physical cell; receiving an update indication sent by the network device on the channel resource of the first TRP based on the beam failure indication; and in response to the update indication, updating a control resource set pool index (CORESETpoolindex) of a control resource set (CORESET) corresponding to the first TRP.