MTRP Beam Indication via Segmented TCI States
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in optimizing beam indication and transmission configuration in Multi-Transmission and Reception Point (MTRP) scenarios, leading to inefficiencies in data transmission and reception.
Innovation Solution
A method and apparatus for user equipment (UE) that receives Radio Resource Control (RRC) configurations and Medium Access Control (MAC) elements to perform communications with multiple Transmission and Reception Points (TRPs) based on Transmission Configuration Indication (TCI) states, enabling joint or separate TCI states for downlink and uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam indication and transmission configuration are optimized in MTRP scenarios, then communication efficiency and reliability are improved, but system complexity increases
Solution Approach 1:
The patent segments the beam indication process by introducing separate TCI state indicators for different TRPs (first TCI state for first TRP, second TCI state for second TRP). This segmentation allows independent configuration and management of beam parameters for each transmission point, improving reliability through dedicated beam management while maintaining manageable complexity through modular structure.
Solution Approach 2:
The patent adds a new dimension to the beam indication system by introducing TCI state types that can indicate either a first TCI state, a second TCI state, or both simultaneously. This dimensional expansion in the indication space enables flexible multi-TRP configurations without requiring complete redesign of the existing beam management framework.
2Adaptability or versatility
If multiple TCI states are indicated for different TRPs, then beam management flexibility is improved, but signaling overhead increases
Solution Approach 1:
The TCI field in the DCI is designed to serve multiple functions: it can indicate a first TCI state for first TRP, a second TCI state for second TRP, or both simultaneously depending on the TCI state type. This multi-functionality allows the same signaling mechanism to adapt to different MTRP scenarios (single TRP, dual TRP, joint TCI) without requiring separate indication channels, thus improving flexibility while controlling overhead.
Solution Approach 2:
The patent changes the interpretation of existing parameters based on the TCI state type. The same TCI field bits can represent different meanings (first TCI state, second TCI state, or combined) depending on the configured TCI state type. This parameter reinterpretation allows flexible beam management for multiple TRPs without increasing the physical size of the signaling fields.
Data Source
AI summary
A user equipment (UE) and a method for beam indication in a multi-transmission and reception point (MTRP) are provided. The method includes: receiving, from a base station (BS), first downlink control information (DCI) including a first transmission configuration indication (TCI) field indicating a first TCI state, the first DCI being associated with a first value; receiving, from the BS, second DCI including a second TCI field indicating a second TCI state, the second DCI being associated with a second value; performing, based on the first TCI state, a first uplink (UL) transmission; and performing, based on the second TCI state, a second UL transmission. The first UL transmission is scheduled by third DCI associated with the first value, and the second UL transmission is scheduled by fourth DCI associated with the second value.