UE PDCCH Interference Identification for PDSCH Demodulation
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP NR, the demodulation performance of the physical downlink shared channel (PDSCH) is degraded due to interference from adjacent cells, as the UE incorrectly assumes PDSCH interference from a PDCCH of an interference cell, leading to reduced reception performance.
Innovation Solution
The UE identifies the PDCCH region of an interference cell using configuration-related information and distinguishes between overlapping and non-overlapping regions of the PDSCH, performing specific demodulation techniques to accurately demodulate the PDSCH based on this identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE assumes PDSCH interference from an interference cell using conventional LTE methods, then the demodulation complexity is kept relatively low, but the PDSCH reception performance degrades due to wrong interference assumptions in NR networks with complicated coreset configuration
Solution Approach 1:
The UE performs preliminary identification of the PDCCH region of the interference cell using configuration information received from the serving cell. This preliminary action allows the UE to determine whether the PDCCH and PDSCH overlap before demodulation, enabling appropriate interference measurement and mitigation strategies to be applied in advance, thus improving reception performance without excessive complexity
Solution Approach 2:
The patent introduces configuration information about the interference cell's PDCCH as an intermediary element. This configuration information acts as a mediator that enables the UE to understand the interference characteristics without directly measuring or detecting the interference in real-time, thus improving demodulation accuracy while maintaining manageable complexity
2Measurement precision
If the UE blindly detects PDCCH and PDSCH regions of the interference cell to determine interference, then the interference measurement may be inaccurate, but the device complexity remains relatively low
Solution Approach 1:
The UE receives and processes configuration information about the interference cell's PDCCH in advance. This preliminary action provides accurate knowledge of the PDCCH region location and duration, enabling precise interference measurement when overlap is detected, without requiring complex blind detection algorithms
Solution Approach 2:
The patent segments the PDSCH region into overlapping and non-overlapping portions relative to the PDCCH. This segmentation allows the UE to apply different interference measurement and mitigation strategies to different portions, improving overall measurement precision while managing complexity through localized processing
Data Source
AI summary
An operation method of user equipment (UE) in communication with a serving cell, the operation method includes receiving configuration information of a first physical downlink control channel (PDCCH) from the serving cell, the first PDCCH corresponding to an interference cell, identifying the first PDCCH based on the configuration information, and demodulating a physical downlink shared channel (PDSCH) based on a result of the identifying, the PDSCH being received from the serving cell.