Unified MAC CE for TCI State Activation
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Solution Overview
Problem
Current New Radio (NR) systems face challenges in efficiently activating and managing Transmission Configuration Indicator (TCI) states for both downlink and uplink communications using a single Medium Access Control (MAC) Control Element (CE), leading to increased signaling overhead and complexity.
Innovation Solution
The proposed solution involves using a MAC CE to map activated TCI states to a plurality of codepoints within the TCI field of a Downlink Control Information (DCI), allowing for flexible association of TCI states with codepoints, thereby reducing signaling overhead and enhancing operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate MAC CEs are used for downlink and uplink TCI state activation, then reliability of TCI state management is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent combines separate downlink and uplink TCI state activation procedures into a single unified MAC CE structure. This MAC CE contains both a downlink TCI state activation indicator and an uplink TCI state activation indicator, allowing simultaneous activation of both downlink and uplink TCI states through one signaling message, thereby reducing device complexity and signaling overhead while maintaining management reliability
Solution Approach 2:
The unified MAC CE structure serves multiple functions: it activates downlink TCI states, activates uplink TCI states, and provides separate indication fields for both directions. This multi-functional design eliminates the need for separate MAC CEs while maintaining the reliability of independent TCI state management for both downlink and uplink
2Measurement precision
If multiple separate MAC CEs are used for TCI state activation, then accuracy of TCI state indication is improved, but signaling overhead increases
Solution Approach 1:
The patent merges multiple TCI state indication functions into a single MAC CE message. The MAC CE includes a downlink TCI state activation indicator field and an uplink TCI state activation indicator field, both contained within the same signaling structure. This consolidation reduces the quantity of signaling messages while preserving the accuracy of TCI state indication through dedicated fields for each direction
3Adaptability or versatility
If flexible mapping of TCI states to codepoints is implemented, then adaptability of communication system is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic and flexible mapping between TCI states and codepoints through the unified MAC CE structure. The MAC CE allows independent configuration of downlink TCI state codepoints and uplink TCI state codepoints, enabling the system to adapt to different communication scenarios. This flexible mapping capability is achieved through a standardized yet configurable MAC CE format that supports various mapping relationships without requiring complex dedicated configuration procedures
Data Source
AI summary
Systems and methods of the present disclosure are directed to a method performed by a wireless communication device (WCD). The method includes receiving, from a Radio Access Network (RAN) node, a Medium Access Control (MAC) Control Element (CE) that includes information. The information indicates a plurality of activated Transmission Configuration Indicator (TCI) states for the WCD including at least one Downlink (DL) TCI state and at least one Uplink (UL) TCI state. The information maps each activated TCI state of the plurality of activated TCI states to one of a plurality of codepoints of a TCI field in a Downlink Control Information (DCI).