Terminal TCI State Control for Multi-TRP Scheduling
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Solution Overview
Problem
Current radio communication systems, particularly in next-generation mobile communication systems like NR, face challenges in effectively controlling multiple downlink transmissions from one or more transmission/reception points (TRPs).
Innovation Solution
A terminal equipped with a receiving section to decode downlink control channels and a control section to determine the transmission configuration indication (TCI state) based on the support of scheduling multiple downlink shared channels across multiple TRPs, using downlink control information provided by the control channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If one or more TRPs perform multiple DL transmissions using multi-panel, then communication capacity and data rates are improved, but control complexity and difficulty of managing multiple TCI states increase
Solution Approach 1:
The patent segments the control of multiple DL transmissions by introducing separate TCI state indication mechanisms for different TRPs. Each TRP's TCI states are independently managed and indicated through specific DCI fields, allowing the terminal to handle multiple TRPs without overwhelming control complexity. This segmentation enables scalable support for multi-TRP operations.
Solution Approach 2:
The patent introduces a new dimension in control by adding TCI state indication fields to the DCI format, specifically using bit fields to indicate TCI states for different TRPs. This dimensional extension allows the system to manage multiple TRPs and their respective TCI states within the existing DCI structure, resolving the contradiction between enhanced productivity and increased complexity.
2Reliability
If multiple TCI states are indicated for multi-TRP, then transmission reliability and coverage are improved, but terminal processing complexity and judgment difficulty increase
Solution Approach 1:
The patent applies local quality by assigning specific TCI states to specific TRPs based on their spatial and functional characteristics. Each TRP receives appropriate TCI state indications tailored to its transmission properties, allowing the terminal to process TCI states locally for each TRP rather than globally, thereby reducing overall processing complexity while maintaining reliability.
Solution Approach 2:
The DCI format acts as an intermediary that carries TCI state indications from the network to the terminal in a structured manner. By embedding TCI state information within the DCI fields, the patent provides a standardized interface that simplifies terminal processing while enabling support for multiple TCI states across multiple TRPs, thus improving reliability without excessive complexity.
3Adaptability or versatility
If multi-PDSCH transmission is controlled by multiple DCI/PDCCH, then scheduling flexibility is improved, but resource overhead and control channel load increase
Solution Approach 1:
The patent merges the control functions by allowing a single DCI to schedule multiple PDSCH transmissions across different TRPs. By combining multiple scheduling decisions into one DCI message with extended TCI state fields, the patent reduces the number of separate PDCCH transmissions required, thereby reducing resource overhead while maintaining scheduling flexibility through the enhanced DCI structure.
Solution Approach 2:
The enhanced DCI format serves multiple functions simultaneously: it schedules PDSCH transmissions, indicates TCI states for multiple TRPs, and provides resource allocation information. This multi-functionality allows the system to achieve scheduling flexibility without proportionally increasing control channel load, as the same DCI structure handles multiple control tasks.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives a downlink control channel, and a control section that judges, based on the presence or absence of configuration or support of scheduling of a plurality of downlink shared channels in a plurality of transmission/reception points using downlink control information provided by the downlink control channel, at least one of a transmission configuration indication (TCI state) indicated by the downlink control information and a TCI state corresponding to a downlink shared channel scheduled by the downlink control information.