TCI Mode Switching for Beam Selection and Common Power Control
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently switching between joint and separate TCI states for uplink and downlink transmissions, particularly in scenarios where power control configurations are not defined, leading to uncertainties in beam selection and power control parameters.
Innovation Solution
User equipment (UE) autonomously switches between joint and separate TCI modes based on trigger events, such as maximum permissible exposure (MPE) or beam failure, and applies a common power control configuration to unconfigured parameters, while communicating with the network entity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system uses separate TCI states for uplink and downlink, then beam selection flexibility is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the TCI state configuration into separate uplink and downlink TCI states, allowing independent configuration and selection for each direction. This enables flexible beam selection for uplink and downlink separately while managing signaling overhead through selective activation and indication mechanisms.
Solution Approach 2:
The system dynamically switches between joint TCI state mode and separate TCI states mode based on operational conditions such as MPE constraints or beam failure events. This dynamic adaptation allows the system to optimize between signaling overhead and beam selection flexibility according to real-time requirements.
2Speed
If the system switches TCI modes autonomously, then response speed to beam failure is improved, but coordination with network entity becomes more complex
Solution Approach 1:
The UE is pre-configured with multiple TCI states and the capability to autonomously switch between them upon detecting trigger events such as beam failure or MPE constraints. This preliminary configuration enables rapid autonomous response without requiring real-time network coordination, reducing response latency while maintaining network awareness through indication messages.
3Adaptability or versatility
If power control parameters are not configured for TCI states, then configuration flexibility is improved, but power control reliability deteriorates
Solution Approach 1:
The patent introduces power control parameters as configurable attributes of TCI states. When separate TCI states are configured for uplink and downlink, corresponding power control parameters can be associated with each TCI state, enabling reliable power control while maintaining the flexibility of separate TCI state configuration through parameter association rather than fixed configuration.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify a transmission configuration indicator (TCI) state to use for communications with a network entity after switching between TCI modes (e.g., a joint TCI state mode and a separate TCI states mode for uplink transmission and downlink reception). A UE may autonomously switch between the TCI modes based on a trigger event, and may send an indication to a network entity of the trigger event prior to communicating. A UE may identify a TCI configuration with unconfigured power control parameters. The UE may determine a common power control configuration for communicating with a network entity based on applying a rule to the TCI configuration to determine the power control parameters.