Multi-Resource SRS Port Mapping Beyond Four-Port NR Limits
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Solution Overview
Problem
Current wireless communication systems, particularly in NR, are limited to supporting a maximum of four SRS ports in a single symbol, which restricts the flexibility and capacity of multi-port SRS transmission.
Innovation Solution
The proposed solution involves flexible mapping of multiple SRS ports to multiple SRS resources and symbols, utilizing comb structures, cyclic shifts, and TD-OCC codes to support additional ports, such as eight ports, by distributing them across multiple resources and symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple SRS ports are mapped to a single SRS resource in one symbol, then the transmission structure is simple, but the maximum number of supported ports is limited to four
Solution Approach 1:
The patent divides the SRS transmission by mapping multiple SRS ports across multiple SRS resources and symbols. Specifically, it segments the ports into groups where different port groups are transmitted in different symbols using different SRS resources, thereby supporting more than four ports while maintaining manageable complexity through structured organization
Solution Approach 2:
The patent extends the SRS transmission from a single-symbol dimension to multi-symbol dimensions. By distributing SRS ports across multiple symbols and resources, the system increases the capacity to support more ports (e.g., eight ports) by utilizing the time dimension (multiple symbols) in addition to the frequency resources
2Adaptability or versatility
If SRS ports are distributed across multiple symbols and resources, then the transmission capacity increases, but the configuration and management complexity increases
Solution Approach 1:
The patent creates a universal SRS resource set structure that can accommodate multiple SRS ports through standardized configuration. The SRS resource set is designed to support both codebook-based and non-codebook-based uplink transmissions, providing multi-functionality that handles different port configurations (e.g., 4 ports, 8 ports) using the same framework
Solution Approach 2:
The patent implements dynamic port-to-resource mapping where the association between SRS ports and SRS resources can be flexibly configured. The system dynamically assigns different port groups to different SRS resources based on the required number of ports, allowing adaptive adjustment of the transmission configuration to match channel conditions and system requirements
Data Source
AI summary
Embodiments herein provide sounding reference signals (SRS) enhancements to support flexible mapping of multiple SRS ports to multiple SRS resources. In some embodiments, a SRS-ResourceSet that includes multiple SRS-Resources configured as a set, wherein multiple SRS ports are distributed over more than one SRS-Resource of the set. A user equipment may transmit a SRS from each SRS port included in the multiple SRS-Resources of the set.