TCI State Switching in DCI for Flexible Beam-Based Shared Channels
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Solution Overview
Problem
Existing mobile communication systems face challenges in efficiently determining and indicating Transmission Configuration Indication (TCI) states for both uplink and downlink transmissions, particularly in high-frequency channels where beam-based methods are used, leading to inefficiencies in data transmission.
Innovation Solution
A method and apparatus for determining TCI states by receiving and sending DCI to indicate transmission resources, allowing terminals and network devices to determine TCI states for physical shared channels, including introducing new indication fields in DCI to dynamically switch between multiple TCI states for improved flexibility and efficiency in M-TRP and S-TRP data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate TCI state indications are used for uplink and downlink transmissions, then transmission flexibility is improved, but signaling overhead increases
Solution Approach 1:
The patent combines uplink and downlink TCI state indications into a unified TCI state framework. The network device configures a unified TCI state that can be applied to both uplink channels (PUSCH, PUCCH, SRS) and downlink channels (PDSCH, PDCCH, CSI-RS), reducing the number of separate indications needed while maintaining transmission flexibility through a single joint TCI state indication mechanism
2Loss of information
If joint TCI state indication is used for uplink and downlink, then signaling overhead is reduced, but transmission adaptability decreases
Solution Approach 1:
The patent implements a dynamic TCI state indication mechanism where the network device can flexibly switch between separate and joint TCI state indications based on transmission conditions. The unified TCI state configuration allows dynamic adaptation to different channel conditions, traffic types, and beam requirements, enabling the system to optimize between overhead reduction and transmission adaptability in real-time
3Productivity
If multiple TCI states are configured for M-TRP and S-TRP transmission, then data transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the TCI state configuration into multiple independent TCI states, each associated with different transmission reception points (TRPs). The network device configures multiple TCI states that can be independently activated for M-TRP and S-TRP transmissions, allowing efficient multi-point transmission while managing complexity through structured configuration and activation mechanisms
Data Source
AI summary
A method for determining a transmission configuration indication (TCI) state is performed by a terminal. The method includes: receiving first downlink control information (DCI) sent by a network device, wherein the first DCI is configured to indicate a transmission resource of a physical shared channel; and determining at least one first TCI state corresponding to the physical shared channel.