PDSCH Rate Matching Across CRS Patterns in NC-JT Spectrum Sharing
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently managing rate matching and dynamic spectrum sharing for Non-coherent Joint-Transmission (NC-JT) scenarios, particularly when multiple transmission points or panels (TRPs) are involved, leading to inefficiencies in resource utilization and interference management.
Innovation Solution
Implementing a method for rate matching that considers cell-specific reference signal (CRS) patterns and transmission configuration indication (TCI) states to manage PDSCH transmissions across multiple TRPs, allowing for dynamic spectrum sharing with LTE, by associating different CRS patterns with distinct TCI states and CDM groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rate matching is performed around CRS patterns from multiple TRPs in NC-JT scenarios, then resource utilization and interference management are improved, but system complexity and configuration overhead increase
Solution Approach 1:
The patent segments the CRS patterns into different sets (first set and second set) associated with different TRPs. Each TRP's PDSCH is rate matched around its corresponding CRS pattern set, allowing independent configuration and management of reference signals from multiple transmission points without requiring complex joint processing of all CRS patterns together.
Solution Approach 2:
The patent performs preliminary configuration of CRS patterns and their associations with TRPs before actual data transmission. The network configures the UE with multiple sets of CRS patterns and indicates which set to use for rate matching through TCI states, preparing the rate matching behavior in advance to avoid complex real-time calculations during transmission.
2Productivity
If dynamic spectrum sharing is implemented between NR and LTE, then spectrum efficiency is improved, but interference management and coexistence challenges increase
Solution Approach 1:
The patent applies different CRS pattern configurations to different TRPs and their associated PDSCH transmissions. Each TRP can have its own customized CRS pattern set, allowing localized optimization of reference signal placement and rate matching behavior specific to each transmission point's interference environment and spectrum sharing requirements.
Solution Approach 2:
The patent uses TCI (Transmission Configuration Indication) states as intermediaries to link CRS patterns with PDSCH transmissions. The TCI states serve as a mapping mechanism that connects the configured CRS pattern sets to specific TRPs and PDSCH resources, enabling the network to control rate matching behavior around CRS from multiple TRPs without direct UE knowledge of each TRP's configuration details.
3Measurement precision
If multiple CRS patterns are configured for different TRPs, then rate matching accuracy is improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
The patent creates a universal TCI state framework that can represent multiple CRS pattern configurations. Each TCI state contains references to CRS pattern sets, allowing a single TCI indication to convey multiple pieces of configuration information (which TRP, which CRS pattern set, how to rate match) in a unified manner, reducing the need for separate signaling for each parameter.
Solution Approach 2:
The patent performs preliminary configuration of multiple CRS pattern sets and stores them in the network's configuration database. Instead of signaling complete CRS pattern details during transmission, the network pre-configures these patterns and references them through TCI states, significantly reducing signaling overhead while maintaining the ability to accurately indicate the appropriate rate matching behavior.
Data Source
AI summary
A method and apparatus are disclosed for rate matching. In one embodiment, a user equipment is configured to receive at least two physical downlink shared channels, PDSCHs; a first PDSCH of the at least two PDSCHs being associated with a first set of cell-specific reference signal, CRS, patterns and a second PDSCH of the at least two PDSCHs being associated with a second set of CRS patterns; and the at least two PDSCHs being rate matched around at least one of the first set of CRS patterns and the second set of CRS patterns. In another embodiment, a network node is configured to transmit the at least one PDSCH of at the least two PDSCHs; and the at least two PDSCHs being rate matched around at least one of the first set of CRS patterns and the second set of CRS patterns.