Terminal Timing Synchronization for Multi-TRP Downlink Control
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Solution Overview
Problem
In next-generation radio communication systems, particularly in NR, there is a lack of effective methods to control repeated transmission from multiple transmission/reception points (TRPs) for downlink channels, which hinders efficient communication.
Innovation Solution
A terminal equipped with a receiver to process multiple downlink control channels across different time domains and a controller to manage the physical shared channel scheduling based on timing-related information from a specific downlink control channel, ensuring appropriate reception and transmission timing alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated transmission is applied to downlink channels from multiple TRPs, then communication reliability is improved, but timing synchronization becomes complex and difficult to manage
Solution Approach 1:
The patent segments the timing control by identifying a specific downlink control channel as a time reference among multiple downlink control channels. This segmentation approach divides the complex timing synchronization problem into manageable parts by establishing a reference point, thereby reducing overall timing synchronization complexity while maintaining communication reliability through repeated transmission from multiple TRPs
Solution Approach 2:
The patent introduces a specific downlink control channel as an intermediary time reference that mediates between multiple TRPs and the terminal. This intermediary element facilitates timing alignment across multiple TRPs without requiring direct complex coordination between all components, thus improving communication reliability while managing timing synchronization complexity
2Adaptability or versatility
If multiple downlink control channels are used for scheduling physical shared channels, then scheduling flexibility is improved, but timing alignment becomes difficult to manage
Solution Approach 1:
The patent applies equipotentiality by establishing a common time reference level across multiple downlink control channels. By determining reception and transmission timing based on a specific downlink control channel as reference, all scheduling operations are aligned to the same timing baseline, maintaining scheduling flexibility while simplifying timing alignment operations
Solution Approach 2:
The patent resolves timing alignment difficulty by introducing a new dimension of control - selecting a specific downlink control channel as a time reference. This dimensional approach allows multiple downlink control channels to maintain scheduling flexibility while being coordinated through the reference channel dimension, thereby improving ease of timing alignment
Data Source
AI summary
An aspect of a terminal of the present disclosure includes: a receiver that receives a plurality of pieces of downlink control information respectively transmitted by using a plurality of downlink control channels allocated to different time domains; and a controller that controls at least one of reception and transmission of a physical shared channel scheduled by the plurality of pieces of downlink control information, in which when contents of timing-related information respectively included in the plurality of pieces of downlink control information are identical, the controller determines at least one of a reception timing and a transmission timing of the physical shared channel based on the timing-related information with a specific downlink control channel as a time reference.