Unified TCI Codepoint Association for Multi-TRP Beam State Control
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Solution Overview
Problem
Existing wireless communication technologies face challenges in managing unified beam states for multi-transmission reception point (TRP) scenarios, including determining default TCI states during quasi-co-location windows, default power settings, handling fallback DCI scheduling, and dynamic switching between single-TRP and multi-TRP operations, which lead to ambiguity and increased signaling overhead.
Innovation Solution
The proposed solution involves extending the unified TCI framework by grouping TCI states into pairs, using codepoints to indicate TCI state combinations, configuring power control settings, and modifying DCI formats to support dynamic switching and multi-TRP operations, thereby reducing ambiguity and optimizing beam management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate TCI states are configured for each TRP, then beam management flexibility is improved, but signaling overhead increases
Solution Approach 1:
The patent combines multiple TCI states into a unified TCI framework where a single TCI state can represent multiple TRPs. This merging approach reduces the number of separate TCI configurations needed while maintaining the ability to manage beams for multiple TRPs, thereby reducing signaling overhead while preserving beam management flexibility.
Solution Approach 2:
The unified TCI state is designed to serve multiple functions by representing multiple TRPs simultaneously. A single TCI state configuration can indicate quasi-co-location relationships with multiple TRPs, making the TCI mechanism universal across different TRP scenarios and reducing the need for separate configurations.
2Loss of information
If unified TCI states are used for multi-TRP, then signaling overhead is reduced, but determination of default TCI states during QCL windows becomes ambiguous
Solution Approach 1:
The patent establishes predetermined rules for determining default TCI states during QCL windows before ambiguity arises. These rules are configured in advance through RRC signaling or higher layer parameters, allowing the UE to reliably determine which TCI state to use during QCL windows without requiring additional dynamic signaling or complex real-time decisions.
3Adaptability or versatility
If dynamic switching between single-TRP and multi-TRP is supported, then system adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic switching between single-TRP and multi-TRP operations through a unified TCI framework that can be flexibly configured. The system can dynamically adjust the number of TRPs associated with a TCI state based on current communication conditions, allowing seamless transitions between operating modes without requiring separate management mechanisms for each mode.
Data Source
AI summary
Systems, methods, processors, and apparatus are provided for determining a unified TCI state in multi transmission reception communication. In one example, a method for a UE includes receiving a configuration of a plurality of transmission configuration indicator (TCI) states and a unified TCI states activation/deactivation medium access control (MAC) control element (CE) to associate TCI codepoints of a downlink control information (DCI) format to the TCI states, each TCI codepoint indicating one or more TCI states; receiving a first single transmission reception point downlink control information (sDCI) including a TCI codepoint of the plurality of TCI codepoints; receiving a second sDCI that schedules a physical uplink shared channel (PUSCH) transmission, wherein the second sDCI indicates one or more of the TCI states associated with the TCI codepoint of the first sDCI; and in response, transmitting the PUSCH based on the second sDCI.