TCI State Indication for 5G Beam Management
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Solution Overview
Problem
The increasing demand for wireless data traffic, driven by the growth of smartphones and other mobile devices, poses challenges for 4G communication systems, necessitating improvements in radio interface efficiency and coverage to support new applications and deployments, which 5G communication systems aim to address through technologies like beamforming, massive MIMO, and advanced small cells.
Innovation Solution
The implementation of Transmission Configuration Indication (TCI) state indications and updates in 5G/NR communication systems, allowing user equipment (UE) and base stations to dynamically configure and manage TCI codepoints for dedicated control and data channels, enabling efficient beam management and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TCI states are dynamically updated via MAC CE for beam management, then beamforming efficiency and data transmission performance are improved, but signaling overhead and system complexity increase
Solution Approach 1:
The patent segments TCI state management into multiple components: reference TCI states defined by RRC configuration, active TCI states managed via MAC CE, and codepoint-based state selection. This segmentation allows dynamic beam updates while organizing complexity into manageable layers, resolving the contradiction between transmission efficiency and system complexity.
Solution Approach 2:
The patent implements preliminary configuration of reference TCI states through RRC signaling before dynamic beam management is needed. These pre-configured reference states serve as a foundation that reduces the complexity of real-time MAC CE operations, as the system only needs to manage activations and codepoint mappings rather than creating TCI states from scratch during dynamic updates.
2Adaptability or versatility
If multiple TCI codepoints are configured for different channels, then beam management flexibility is improved, but configuration complexity and processing overhead increase
Solution Approach 1:
The patent creates a universal TCI state framework where a single set of reference TCI states can be reused across multiple channels and signal types through codepoint associations. Instead of configuring separate beam parameters for each channel, the system defines universal reference states that can be activated for PDSCH, PDCCH, and other channels as needed, providing flexibility while reducing configuration complexity.
Solution Approach 2:
The patent uses codepoints as references or copies that point to actual TCI state configurations. Rather than duplicating full TCI state configurations for each channel, the system creates lightweight codepoint identifiers that reference the underlying state definitions, reducing configuration overhead while maintaining the ability to apply appropriate beam settings across multiple channels.
3Speed
If reference TCI states are pre-configured via RRC, then dynamic beam switching speed is improved, but initial setup time and signaling overhead increase
Solution Approach 1:
The patent performs preliminary configuration of reference TCI states through RRC signaling during initial connection setup or configuration updates. This advance preparation ensures that when dynamic beam switching is needed, the TCI states are already defined and ready for rapid activation via MAC CE, achieving fast beam switching while accepting the necessary initial setup time.
Solution Approach 2:
The patent implements a dynamic TCI state management system where the configuration is not static but can be updated and reconfigured as needed. Reference TCI states can be modified through subsequent RRC reconfiguration, and the active set of TCI states is dynamically adjusted via MAC CE activations, allowing the system to adapt to changing channel conditions while maintaining fast switching capability.
Data Source
AI summary
Methods and apparatuses for transmission configuration indication (TCI) state indications and updates. A method performed by a user equipment includes applying a TCI state for UE dedicated control and data channels and receiving, via a medium access control (MAC) control element (CE), a plurality of TCI codepoints. The method further includes identifying a reference TCI codepoint from the plurality of TCI codepoints; determining, from the reference TCI codepoint, one or more TCI states; and determining whether to apply the one or more TCI states or the reference TCI state for the UE dedicated control and data channels.