CSI Reporting Subframe Region Segmentation for ULL Latency
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Solution Overview
Problem
Current LTE technologies face challenges in achieving low latency for channel state information (CSI) reporting, which is essential for improving bandwidth efficiency and reducing communication latency as demand for mobile broadband access increases.
Innovation Solution
The proposed solution involves detecting a CSI reporting trigger to identify specific subframe regions within a subframe for generating CSI, allowing for differential CSI reporting and transmission to network entities, which can include control, data, or grey regions, and utilizing a limited number of CSI reporting ranks and subbands, particularly for Ultra Low Latency (ULL) communication technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If legacy LTE CSI reporting is used with 1ms subframe TTI, then system compatibility is maintained, but latency is high and bandwidth efficiency is insufficient
Solution Approach 1:
The patent segments the subframe into multiple subframe regions (first subframe region and second subframe region) with different TTIs. The first subframe region uses 1ms TTI for legacy compatibility, while the second subframe region uses shortened TTI (e.g., 2ms or shorter) for low-latency communication. This segmentation allows the system to simultaneously support both high-latency tolerant and low-latency requiring services without requiring complete system redesign.
Solution Approach 2:
The patent introduces dynamic TTI adaptation where the TTI length can be changed based on service requirements. The system can dynamically switch between different TTI lengths (1ms, 2ms, or shorter) for different subframe regions or different service types, enabling flexible latency optimization while maintaining backward compatibility with legacy LTE infrastructure.
2Speed
If shortened TTI is used for ULL communication, then latency is reduced, but CSI reporting requirements become more stringent and complex
Solution Approach 1:
The patent segments CSI reporting into subframe-region-specific reporting, where CSI is reported separately for the first subframe region (1ms TTI) and the second subframe region (shortened TTI). This segmentation allows different CSI measurement and reporting configurations to be applied to different regions, reducing the overall complexity while maintaining necessary precision for low-latency communication.
Solution Approach 2:
The patent changes CSI reporting parameters based on the subframe region. For the second subframe region with shortened TTI, the system can adjust CSI reporting parameters such as reporting frequency, reporting quantity, and measurement timing to match the reduced latency requirements, thereby maintaining measurement precision without excessive complexity.
3Productivity
If subframe-region-specific CSI generation is implemented, then latency is reduced and bandwidth utilization improves, but system complexity increases
Solution Approach 1:
The patent implements a universal CSI reporting framework that can handle both legacy 1ms TTI and shortened TTI scenarios through a unified subframe region identification mechanism. The same CSI reporting structure is used for both subframe regions, with the difference being the specific parameters and timing configured for each region. This multi-functionality reduces system complexity compared to implementing separate independent reporting systems.
Solution Approach 2:
The patent uses preliminary configuration where the network entity pre-configures the UE with subframe region information and CSI reporting parameters before actual CSI reporting occurs. This preliminary action includes configuring which subframes belong to which region, what TTIs to use, and what CSI parameters to report, thereby simplifying the real-time processing complexity during actual operation.
Data Source
AI summary
Techniques for handling Channel State Information (CSI) for ultra low latency (ULL) in Long Term Evolution (LTE) devices are presented. For example, an example method of reporting CSI to a network entity is presented. Such an example method may include detecting a CSI reporting trigger for reporting CSI to the network entity and identifying, based on detection of the CSI reporting trigger, a subframe region for which the CSI is to be generated. In an aspect, the subframe region is included in a plurality of subframe regions, where each subframe region of the plurality of subframe regions includes at least one symbol of a subframe. In an additional aspect, the example method may include generating the CSI based on the subframe region and transmitting the CSI to the network entity.