Wireless Terminal PDSCH Overlap Handling via PT-RS Rate Matching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, the existing methods for transmitting and receiving downlink signals between user equipment (UE) and base stations face challenges in accurately handling overlapping physical downlink shared channels (PDSCHs) and phase tracking reference signals (PT-RS), leading to potential interference and reduced data communication reliability.
Innovation Solution
A method where the user equipment (UE) receives specific information about overlapping PDSCHs through downlink control information (DCI), allowing it to assume that data is not transmitted in resources overlapping with the PT-RS for the second PDSCH, and adjusts its reception accordingly, thereby protecting the PT-RS and ensuring reliable data communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE receives and processes multiple DCIs for overlapping PDSCHs, then the data communication capacity is improved, but the interference between PT-RS and PDSCH increases and reliability decreases
Solution Approach 1:
The patent segments the resource allocation by identifying and separating overlapping PDSCH regions from non-overlapping regions. The UE processes DCI differently based on whether the PDSCH resources overlap with PT-RS resources, allowing selective application of rate-matching assumptions to specific resource segments while maintaining normal processing for non-overlapping segments.
Solution Approach 2:
The patent applies preliminary rate-matching assumptions before actual data reception. The UE determines in advance which PDSCH resources should be rate-matched around PT-RS based on DCI information and configured parameters, preparing the reception strategy beforehand to avoid interference issues during actual data acquisition.
2Reliability
If the UE assumes no data transmission in overlapping resources to protect PT-RS, then the reliability is improved, but the data transmission efficiency deteriorates
Solution Approach 1:
The patent applies different quality assumptions to different resource regions. Instead of uniformly assuming no data transmission across all overlapping resources, the UE applies rate-matching assumptions only to specific resource elements where PDSCH and PT-RS overlap, while maintaining normal data transmission assumptions in non-overlapping regions, thus optimizing the balance between reliability and efficiency.
Solution Approach 2:
The patent dynamically changes the rate-matching assumption parameter based on the overlap condition. When PDSCH resources overlap with PT-RS resources, the UE switches to a rate-matching assumption mode; when there is no overlap, normal reception mode is used. This parameter change is controlled by DCI information and configured parameters like rateMatchPattern.
Data Source
AI summary
The present disclosure provides a method for transmitting and receiving a downlink signal between a terminal and a base station in a wireless communication system and an apparatus for supporting same. According to an embodiment applicable to the present disclosure, when the terminal recognizes that a first physical downlink shared channel (PDSCH) and a second PDSCH are overlapped, the terminal may receive a downlink signal including the first PDSCH, under the assumption that a phase tracking reference signal (PT-RS) for the second PDSCH and the first PDSCH are overlapped.