Multi-Symbol 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, necessitating enhancements for more efficient utilization of multiple ports and symbols.
Innovation Solution
The proposed solution involves flexible mapping of multiple SRS ports to multiple SRS resources and symbols using comb structures, cyclic shifts, and time domain orthogonal cover codes (TD-OCC) to support additional ports, such as eight ports, by distributing them across multiple resources or symbols, and configuring them using precoding information and resource indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple SRS ports are mapped to a single symbol, then the transmission capacity is limited to four ports per symbol, but the system requires support for more than four ports to enhance multi-antenna communication performance
Solution Approach 1:
The patent segments the mapping of SRS ports by distributing multiple ports across multiple symbols instead of confining them to a single symbol. Specifically, it maps a first set of SRS ports to a first symbol and a second set of SRS ports to a second symbol, thereby overcoming the four-port limitation per symbol while maintaining flexible configuration through independent port-set assignments to different symbols
Solution Approach 2:
The patent transitions from a single-dimension mapping (multiple ports within one symbol) to a two-dimension mapping (ports distributed across multiple symbols in the time domain). This dimensional expansion in the time dimension allows the system to support more than four SRS ports by utilizing the symbol dimension as an additional resource for port differentiation
2Productivity
If SRS ports are distributed across multiple symbols, then the transmission capacity and channel estimation performance are improved, but the system complexity and configuration overhead increase
Solution Approach 1:
The patent employs a universal mapping framework where the same SRS resource structure can serve multiple functions: supporting up to four ports per symbol while also enabling extended port support across multiple symbols. The configuration uses universal parameters (port indices, symbol allocations, resource indicators) that can adapt to different port counts and symbol configurations, reducing the need for separate configuration mechanisms
Data Source
AI summary
Embodiments herein provide sounding reference signals (SRS) enhancements to support flexible mapping of multiple SRS ports to multiple symbols. In some embodiments, a network node may send, to a user equipment (UE), a sounding reference signal (SRS) configuration that maps multiple SRS ports across multiple symbols using a time domain orthogonal cover code (TD-OCC) codebook. The UE may transmit a SRS from each SRS port using the multiple symbols. The network node may provide feedback based on the SRS from each SRS port.