Multi-TRP PDCCH CSI Feedback for Beam Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently transmitting Physical Downlink Control Channel (PDCCH) with multiple beams from multiple Transmit Receive Points (TRPs), leading to limited capacity, increased blocking probability, and inadequate reliability for Ultra Reliable Low Latency Communications (URLLC) scenarios.
Innovation Solution
The proposed solution involves enhanced Channel State Information (CSI) feedback mechanisms that allow for accurate joint beam selection and aggregation level determination for PDCCH transmission from multiple TRPs. This is achieved through the configuration of multiple CSI resource sets, reference signal transmission, and optimized CSI reporting formats that include beam indices and channel quality information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDCCH is transmitted from a single TRP, then the system is simple to implement, but the PDCCH capacity is limited and blocking probability increases
Solution Approach 1:
The patent segments the PDCCH transmission function across multiple TRPs (Transmit Receive Points), allowing different TRPs to transmit PDCCH simultaneously. This segmentation increases overall PDCCH capacity by distributing transmission loads across multiple independent transmission points, directly resolving the capacity limitation of single-TRP transmission.
Solution Approach 2:
The patent introduces a spatial dimension to PDCCH transmission by utilizing multiple TRPs located at different physical locations. This dimensional expansion from single-point to multi-point transmission increases system capacity without proportionally increasing complexity, as the additional TRPs operate semi-independently.
2Reliability
If high aggregation level PDCCH is used for cell edge UEs, then transmission reliability is improved, but PDCCH resources are consumed and blocking probability increases
Solution Approach 1:
The patent merges PDCCH transmission resources from multiple TRPs to serve cell edge UEs. Instead of relying on a single high-aggregation-level transmission that consumes excessive resources, multiple TRPs can provide combined transmission support, achieving the required reliability through spatial diversity while improving resource efficiency by distributing the transmission burden.
3Reliability
If multiple beams from multiple TRPs are used for PDCCH transmission, then transmission reliability is improved, but CSI feedback complexity increases
Solution Approach 1:
The patent segments the CSI feedback mechanism into separate reporting channels for different TRPs and beam parameters. This segmentation allows the UE to report channel state information for multiple beams and TRPs independently, managing the complexity by organizing feedback into structured, manageable components rather than a single complex report.
Solution Approach 2:
The patent implements preliminary configuration of CSI reporting formats and parameters before actual PDCCH transmission. By pre-defining the feedback structure, measurement requirements, and reporting triggers, the system prepares the complexity management framework in advance, reducing the operational complexity during actual multi-beam transmission scenarios.
Data Source
AI summary
Apparatus and methods of enhanced CSI feedback for enhanced PDCCH transmission with multiple beams from multiple TRPs are disclosed. The apparatus includes: a receiver that receives a Channel State Information (CSI) report configuration for Physical Downlink Control Channel (PDCCH) transmission using a plurality of transmitting-receiving identities; receives a CSI resource configuration indicating CSI resources from the transmitting-receiving identities; and receives a Reference Signal (RS) and/or a Synchronization Signal Block (SSB) in the CSI resources from the transmitting-receiving identities; a processor that generates a CSI report based on the Reference Signal (RS) and/or the Synchronization Signal Block (SSB) received, in a format according to the CSI report configuration; and a transmitter that transmits the CSI report generated.