Multi-PDSCH Scheduling via Unified DCI and TCI States
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Solution Overview
Problem
In high-throughput applications like virtual reality (VR)/augmented reality (AR) and non-terrestrial communications, user equipment (UE) in New Radio (NR) systems face significant signaling overhead when scheduling consecutive physical downlink shared channels (PDSCHs), adhering to Release 15 or 16 specifications, which complicates channel access procedures and affects communication performance.
Innovation Solution
Implementing a method where a user equipment (UE) or base station configures multiple PDSCH scheduling using downlink control information (DCI) with transmission reception points (TRPs) corresponding to specific transmission configuration indication (TCI) states, reducing signaling overhead and enhancing communication reliability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Release 15 or 16 specifications are used for scheduling consecutive PDSCHs, then communication compatibility is maintained, but signaling overhead increases significantly
Solution Approach 1:
The patent merges multiple PDSCH scheduling operations into a single DCI format, allowing one DCI to schedule multiple PDSCHs with different TCI states. This combining approach reduces the number of separate DCI messages needed, thereby reducing signaling overhead while maintaining the ability to schedule multiple channels efficiently
Solution Approach 2:
The DCI format is enhanced to serve multiple functions simultaneously - it can schedule multiple PDSCHs, indicate multiple TCI states, and support both single-TRP and multi-TRP scenarios. This multi-functionality allows the same signaling structure to handle diverse scheduling requirements without increasing overhead
2Reliability
If multiple TCI states are configured for multi-TRP operation, then communication performance improves, but device complexity increases
Solution Approach 1:
The base station pre-configures multiple TCI states and associates them with specific PDSCH scheduling decisions in advance. The UE receives and stores these TCI state configurations before actual PDSCH transmission, allowing the device to handle multi-TRP operations without real-time processing complexity
Solution Approach 2:
The patent segments the TCI state configuration into discrete, manageable units that can be individually activated and deactivated. Each TCI state is independently configurable and can be associated with specific PDSCHs, allowing the UE to process only the relevant configurations needed for current operation
Data Source
AI summary
A method of wireless communication, a user equipment and a base station are provided. The method by a user equipment (UE) includes being configured, by a base station, with a downlink control information (DCI) scheduling a first set of physical downlink shared channels (PDSCHs) and/or a second set of PDSCHs, and being configured, by the base station, with a first transmission reception point (TRP) corresponding a first transmission configuration indication (TCI) state and/or a second TRP corresponding a second TCI state. The first TCI state is used for reception of at least a part of the first set of PDSCHs.