TCI State Management for Shared Data Channel Beam Selection
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Solution Overview
Problem
Conventional techniques for managing active receive beams in wireless communications systems are deficient, leading to increased complexity for user equipment (UE) in identifying suitable beams for communication with base stations, particularly in scenarios involving shared data channels and quasi co-location (QCL) assumptions.
Innovation Solution
The implementation of transmission configuration indication (TCI) methods, where a base station transmits a TCI to the UE, including a QCL reference, to assist in selecting the appropriate receive beam, and the UE determines spatial characteristics for downlink transmissions based on this reference, allowing dynamic beam selection and reduced complexity by limiting the number of active TCI states based on UE capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE is configured with multiple active TCI states for beam management, then the adaptability and beam selection flexibility are improved, but the device complexity and computational burden at the UE increase
Solution Approach 1:
The patent implements dynamic beam management where the UE can transition between different TCI states based on reception quality measurements. The system dynamically selects which TCI state to use for receiving PDCCH and PDSCH transmissions, allowing adaptation to changing channel conditions while managing complexity through controlled state transitions rather than simultaneous processing of all states.
Solution Approach 2:
The patent changes the parameter of active TCI state configuration by allowing the network to configure multiple TCI states but enabling the UE to activate only one at a time for actual reception. The UE measures reception quality for multiple TCI states and reports measurements, allowing the network to determine which state to activate, thus balancing adaptability with reduced UE processing complexity.
2Reliability
If the UE monitors multiple control resource sets with different QCL assumptions, then the reliability of control channel reception is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent segments the control channel monitoring into multiple control resource sets (CORE_SETS), each associated with a different TCI state and QCL assumption. This segmentation allows the UE to monitor different control channels with different beam assumptions independently, improving reliability through diversity while managing measurement complexity by organizing monitoring tasks into distinct segments with clear associations.
3Device complexity
If the number of active beams is limited based on UE capability, then the device complexity is reduced, but the adaptability and communication efficiency deteriorate
Solution Approach 1:
The patent implements preliminary action by having the network pre-configure multiple TCI states with different QCL assumptions before actual data transmission. The UE performs measurements and reports on these pre-configured states, allowing the network to select the most appropriate state for activation. This preliminary configuration and measurement phase enables efficient communication with limited active beams, as the best beam is selected in advance based on measurements rather than requiring simultaneous maintenance of multiple active beams.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive signaling configuring a first active transmission configuration indication (TCI) state for an initial control resource set and a second active TCI state for a second control resource set. The UE may monitor the initial control resource set using a first beam corresponding to the first active TCI state, the second control resource set using a second beam corresponding to the second active TCI state, and a shared data channel using one of the two beams. The UE may perform a random access channel procedure to select a third beam and update a quasi co-location assumption for the initial control resource set to correspond to the third beam. The UE may apply a selection rule for selecting between the second beam and the third beam and monitor the shared data channel using the selected beam.