Unified Downlink Control Information for Multi-TRP Scheduling
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing downlink control information for multi-TRP transmissions, which affects the scheduling and reception of downlink data streams by wireless devices from multiple transmission reception points.
Innovation Solution
A cellular base station provides a unified downlink control information format that includes configuration details such as physical resource block bundling sizes, frequency domain resource allocations, modulation and coding schemes, and phase tracking reference signal configurations, enabling wireless devices to receive and decode data from multiple TRPs effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a unified downlink control information format is implemented for multi-TRP transmissions, then scheduling efficiency and system reliability are improved, but the complexity of downlink control information processing increases
Solution Approach 1:
The downlink control information is segmented into multiple fields, each serving a specific function: TCI state indication field for transmission configuration, frequency domain resource allocation field for resource scheduling, modulation and coding scheme field for data transmission parameters. This segmentation allows the system to manage complex multi-TRP transmissions through structured, modular information elements that can be processed independently.
Solution Approach 2:
The unified downlink control information format is designed to serve multiple functions simultaneously: it schedules downlink transmissions from multiple TRPs, indicates TCI states for beam management, allocates frequency domain resources, and specifies modulation and coding schemes. This multi-functional design eliminates the need for separate control messages for different aspects of multi-TRP operation, thereby improving reliability while managing complexity through consolidation.
2Manufacturing precision
If detailed configuration information is included in downlink control information, then transmission precision and resource allocation accuracy are improved, but the amount of control information overhead increases
Solution Approach 1:
Transmission Configuration Indication (TCI) states are pre-configured and stored in the wireless device, containing advance information about transmission parameters from multiple TRPs. When scheduling occurs, the base station simply indicates which pre-configured TCI states to use rather than transmitting complete configuration details, thereby achieving precise resource allocation with reduced control information overhead.
Solution Approach 2:
Instead of transmitting complete resource allocation and transmission parameter details for each multi-TRP transmission, the system uses compact indicators (such as TCI state indices, resource allocation indices, MCS indices) that reference pre-defined configurations. These indicators act as copies or references to the actual detailed configurations, maintaining precision while minimizing the quantity of control information that must be transmitted.
Data Source
AI summary
Apparatuses, systems, and methods for providing downlink control for multi-TRP transmission. A cellular base station may provide a downlink control information transmission to a wireless device scheduling downlink transmissions to the wireless device from multiple transmission reception points. The downlink control information may include information that can be used by the wireless device to determine any or all of physical resource block bundling sizes, frequency domain resource allocations, modulation and coding schemes, redundancy versions, phase tracking reference signal configurations, and any of various other possible types of configuration information for the downlink transmissions. The wireless device may receive the downlink transmissions from the plurality of transmission reception points in accordance with the downlink control information.