Flexible CSI Report Triggering for URLLC Latency

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Solution Overview

Problem

Current CSI reporting mechanisms in wireless communication systems, particularly in New Radio (NR) standards, face challenges in achieving ultra-low latency and flexible triggering of Channel State Information (CSI) reports, which are essential for reliable Ultra-Reliable Low-Latency Communication (URLLC) services. Existing frameworks are restrictive, as they require exclusive CSI computation resources and cannot override ongoing CSI calculations, limiting the application of ultra-low latency timing.

Innovation Solution

The proposed solution involves enabling timeline switching, allowing wireless devices to stop calculating existing CSI reports and prioritize ultra-low latency CSI reports by allocating all computation resources, thereby achieving flexible triggering and reducing CSI latency. This is achieved through higher layer configurations and Downlink Control Information (DCI) signaling, enabling the UE to dynamically switch between different CSI timeline requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the system requires exclusive CSI computation resources and cannot override ongoing CSI calculations, then the existing framework maintains stability and avoids resource conflicts, but ultra-low latency CSI reporting cannot be achieved when the device is already processing another CSI report

Engineering Contradiction:

Improvestability of CSI computation frameworkVSAvoidCSI reporting latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies dynamics by making the CSI computation resource allocation flexible rather than static. The system dynamically switches between different timeline requirements (first and second timeline requirements) based on service type. When URLLC service is detected, the system dynamically overrides ongoing CSI calculations to meet ultra-low latency requirements, whereas for eMBB services it follows the standard timeline. This dynamic resource allocation resolves the contradiction between framework stability and latency reduction.

Inventive Principle:

Principle #15Dynamics

2Device complexity

If the system follows a fixed timeline requirement for CSI reporting, then the computation process is simple and predictable, but the system cannot adapt to different service requirements such as mobile broadband and URLLC

Engineering Contradiction:

Improvesimplicity of CSI computation processVSAvoidflexibility to support different services

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent applies parameter changes by introducing a service type parameter that determines which timeline requirement to apply. The system changes the timeline parameter (first timeline for eMBB, second timeline for URLLC) based on the detected service type. This allows the same CSI computation framework to adapt to different service requirements without fundamental structural changes, resolving the contradiction between simplicity and versatility.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies universality by designing a single CSI computation framework that can serve multiple functions - supporting both eMBB and URLLC services through different timeline requirements. The framework universally handles CSI computation for various service types by detecting the service type and applying the appropriate timeline, eliminating the need for separate dedicated systems for each service type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If the system allocates all computation resources to ultra-low latency CSI reports, then URLLC scheduling reliability is improved, but ongoing CSI report calculations are interrupted

Engineering Contradiction:

Improvereliability of URLLC schedulingVSAvoidthroughput of CSI report processing

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies segmentation by dividing the CSI computation resources into different processing paths based on service type. The system segments the computation workflow into eMBB path (standard timeline) and URLLC path (ultra-low latency timeline). When URLLC is detected, the system segments the resource allocation to prioritize URLLC CSI computation, allowing critical URLLC scheduling to proceed without being blocked by ongoing eMBB CSI calculations.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11984954B2Systems and methods for flexible triggering of CSI reports

Publication Date: 2024.05.14 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Systems and methods for flexible triggering of Channel State Information (CSI) reports are provided. A method performed by a wireless device for transmitting a CSI report according to a timeline requirement includes one or more of: determining to enable timeline switching; receiving an instruction to determine a first CSI report; determining to stop determining an existing ongoing second CSI report; determining the first CSI report; and transmitting the first CSI report. In this way, some embodiments allow ultra-low latency CSI reporting also for the cases when the wireless device is already in the ongoing process of determining a CSI report. In some embodiments, Ultra-Reliable Low-Latency Communication (URLLC) CSI reports are allowed to “override” previous CSI calculations. Some embodiments achieve more flexible triggering of URLLC CSI reports so that the ultra-low latency CSI timeline can be applied for more cases, reducing the CSI latency and resulting in more reliable URLLC scheduling.