Multi-TRP Beam Management with Reference-Signal Selection
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Solution Overview
Problem
Existing beam management techniques in multi-TRP operations face challenges in efficiently acquiring and maintaining optimal beam connections between user equipment (UE) and multiple transmission reception points (TRPs) in 5G NR networks, particularly in scenarios where simultaneous beam transmission is constrained.
Innovation Solution
Implementing beam management techniques on both the UE side and network side, including beam reporting and beam failure detection/recovery procedures, where multiple TRPs transmit reference signals, allowing the UE to select and report beams, and the network configures optimal beams for simultaneous downlink data transmission using different TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple TRPs transmit reference signals simultaneously for beam management, then beam selection accuracy is improved, but signal interference between TRPs increases
Solution Approach 1:
The patent divides the beam management process into separate time slots where each TRP transmits reference signals sequentially rather than simultaneously. The first TRP transmits first reference signals in a first time slot, and the second TRP transmits second reference signals in a second time slot, eliminating interference while maintaining measurement accuracy.
Solution Approach 2:
The patent implements preliminary beam filtering where the UE measures reference signals from multiple TRPs and selects candidate beams before final downlink transmission. The network configures the UE with reference signal resources and measurement configurations in advance, allowing the UE to pre-identify optimal beams without interference during actual data transmission.
2Reliability
If beam failure detection and recovery procedures are implemented, then connection reliability is improved, but system complexity increases
Solution Approach 1:
The patent implements beam failure detection through feedback mechanisms where the UE continuously monitors beam quality metrics and reports to the network. When beam failure is detected, the UE provides feedback information about failed beams and alternative candidate beams, enabling the network to automatically switch to recovery beams without complex manual intervention.
Solution Approach 2:
The patent enables self-service beam failure recovery where the UE autonomously detects beam failures, identifies alternative beams from pre-configured reference signals, and initiates recovery procedures without requiring constant network control. The UE uses pre-configured search spaces and reference signal resources to independently perform beam recovery operations.
Data Source
AI summary
A cell performs beam management operations for a user equipment (UE). The cell transmits a first group of multiple reference signals via a first transmission reception point (TRP) to a user equipment (UE), transmits a second group of multiple reference signals via a second different TRP to the UE, receives an indication that the UE has selected a first beam associated with one of the multiple reference signals of the first group and a second beam associated with one of the multiple reference signals of the second group and transmits downlink data to the UE using the first beam and the second beam.