Beam Management Reference Signal Selection for 5G NR
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Solution Overview
Problem
Current beam management techniques in cellular communication networks, particularly in 5G NR, face challenges in efficiently selecting Reference Signals (RS) for failure detection resource sets when a User Equipment (UE) is configured with multiple Transmission Configuration Indicator (TCI) states, leading to potential exceeding of the maximum number of RSs allowed, which affects beam failure detection and radio link monitoring.
Innovation Solution
The solution involves an apparatus and method where a UE determines its configuration with multiple TCI states for control resource sets and selectively chooses Reference Signals for failure detection resource sets based on the number of TCI states, ensuring that the maximum number of RSs is not exceeded, by associating RSs from different TCI states with specific failure detection resource sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE is configured with multiple TCI states for control resource sets, then beam diversity and reliability are improved, but the number of Reference Signals for failure detection exceeds the maximum allowed
Solution Approach 1:
The patent segments the failure detection resource set into multiple subsets, where each subset is associated with a specific TCI state. Instead of including all Reference Signals from all TCI states in a single failure detection resource set, the UE creates separate subsets (e.g., first failure detection resource set for first TCI state, second failure detection resource set for second TCI state). This segmentation allows the system to maintain multiple TCI states for reliability while keeping the number of Reference Signals in each failure detection resource set within the maximum allowed limit.
2Reliability
If all Reference Signals from multiple TCI states are included in a single failure detection resource set, then comprehensive beam monitoring is achieved, but the maximum number of RSs allowed is exceeded
Solution Approach 1:
The patent introduces a new dimension of organization by creating multiple failure detection resource sets instead of using a single set. Each resource set is associated with a specific TCI state, transforming the problem from a single-dimension (one set containing all RSs) to a multi-dimensional structure (multiple sets, each containing RSs for a specific TCI state). This dimensional change allows comprehensive beam monitoring across all TCI states while maintaining compliance with the maximum number of RSs per resource set constraint.
3Productivity
If the maximum number of RSs is strictly limited, then system resource efficiency is improved, but beam failure detection capability is degraded
Solution Approach 1:
The patent makes each failure detection resource set universally applicable to its associated TCI state. Each resource set is designed to independently monitor beam failure for its specific TCI state, allowing the system to maintain resource efficiency within each set while collectively providing comprehensive beam failure detection capability across all TCI states. This multi-functionality approach allows the same resource set structure to serve multiple TCI states, maintaining resource efficiency without degrading detection capability.
Data Source
AI summary
According to an example aspect of the present disclosure, there is provided an apparatus comprising means for determining that the apparatus is configured or activated with at least two Transmission Configuration Indicator, TCI, states for at least one first control resource set and with at least one TCI state for at least one second control resource set and means for selecting at least one Reference Signal, RS, of the at least one first control resource set associated with the at least two TCI states to at least one failure detection resource set and at least one RS of the at least one second control resource set associated with the at least one TCI state to the at least one failure detection resource set.