PDCCH CSI Feedback Using Overlapping Reference Signals
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Solution Overview
Problem
Existing wireless communication systems lack accurate and timely channel state information (CSI) feedback for the physical downlink control channel (PDCCH), particularly in high-reliability and low-latency applications, leading to inadequate adaptation of PDCCH transmissions.
Innovation Solution
The UE receives a reference signal within a frequency-time region overlapping with the PDCCH region, generates CSI based on this signal, and transmits it to the base station, enabling precise characterization of the PDCCH channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE uses reference signals from data channels (PDSCH) for channel assessment, then the system complexity is reduced, but the accuracy and timeliness of CSI feedback for PDCCH is insufficient
Solution Approach 1:
The patent makes the PDCCH demodulation reference signal (DMRS) serve dual purposes: it acts as both a demodulation reference for the control channel and as a channel state information reference signal for CSI feedback. This multi-functionality eliminates the need for separate reference signals, thereby improving CSI accuracy without significantly increasing system complexity
Solution Approach 2:
The patent combines the PDCCH DMRS and CSI-RS into a single reference signal resource. By merging these two previously separate functions into one unified reference signal, the system achieves accurate PDCCH channel assessment while avoiding the overhead and complexity of maintaining separate reference signal structures
2Reliability
If the system implements accurate and timely CSI feedback for PDCCH, then the reliability and latency performance improve, but the system complexity and overhead increase
Solution Approach 1:
The PDCCH DMRS is configured to serve multiple functions simultaneously: PDCCH demodulation and CSI feedback. This multi-functional approach enables accurate and timely channel assessment for reliable PDCCH transmissions without requiring additional dedicated reference signals, thus improving reliability without proportionally increasing system complexity
Solution Approach 2:
The existing PDCCH DMRS structure is utilized to provide CSI feedback functionality. Instead of adding separate infrastructure for CSI acquisition, the system makes the existing DMRS self-sufficient by configuring it to carry dual purposes, thereby achieving improved reliability and latency performance without significant complexity overhead
3Measurement precision
If separate CSI-RS resources are allocated for PDCCH channel assessment, then the measurement precision improves, but the overhead and resource consumption increase
Solution Approach 1:
The patent merges the PDCCH DMRS and CSI-RS into a single unified reference signal. This consolidation eliminates the need for separate CSI-RS resources dedicated to PDCCH channel assessment, thereby maintaining measurement precision while significantly reducing reference signal overhead and resource consumption
Solution Approach 2:
The unified reference signal structure is designed to fulfill multiple functions: serving as PDCCH demodulation reference and CSI feedback reference simultaneously. This multi-functionality eliminates redundant signaling, reducing overall reference signal overhead while maintaining accurate channel assessment capabilities
Data Source
AI summary
This disclosure provides systems, methods, apparatus, computer programs encoded on computer readable-medium to provide a user equipment (UE) to receive a reference signal from a base station, wherein the reference signal is received within a frequency-time region that overlaps with a control channel frequency-time region, generate information related to a control channel between the UE and the base station based on the reference signal, and transmitting the information to the base station.