MAC-CE Signaling for CSI Reporting in 5G Networks

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Solution Overview

Problem

Advanced wireless communication systems, particularly 5G networks, face challenges in efficient radio resource management and seamless channel state information (CSI) reporting across various use cases and frequency bands, requiring improved mechanisms for synchronization and resource allocation to support diverse coverage requirements and propagation losses.

Innovation Solution

The implementation of a method where a user equipment (UE) receives medium access control (MAC) control element signaling with quasi co-location (QCL) indications from a base station, enabling the UE to identify and activate resources for CSI reporting, and the base station configures these resources to facilitate efficient CSI reporting and resource management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional synchronization and resource allocation mechanisms are used, then system complexity is reduced, but radio resource management efficiency and CSI reporting performance deteriorate in 5G networks with diverse use cases and frequency bands

Engineering Contradiction:

Improveradio resource management efficiencyVSAvoidsynchronization mechanism complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements dynamic resource allocation and synchronization mechanisms where the base station can flexibly configure and update resource allocations for CSI reporting based on varying network conditions, use cases, and frequency band characteristics. The system transitions from static to dynamic resource management, allowing real-time adaptation to support diverse 5G requirements while maintaining manageable complexity through standardized procedures.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If separate resource allocation mechanisms are implemented for different use cases and frequency bands, then adaptability and coverage requirements are met, but resource allocation complexity and latency increase

Engineering Contradiction:

Improvesupport for diverse use cases and frequency bandsVSAvoidresource allocation latency

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent establishes a universal resource allocation framework that can handle multiple use cases (eMBB, URLLC, mMTC) and frequency bands through a common signaling mechanism. The base station uses unified MAC CE signaling to allocate resources for CSI reporting across different scenarios, eliminating the need for separate specialized mechanisms and thereby reducing allocation latency while maintaining adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system performs preliminary configuration of resource allocation parameters and QCL relationships through RRC signaling before actual CSI reporting occurs. This advance preparation allows the MAC CE signaling to only trigger and activate pre-configured resources, significantly reducing the latency of resource allocation when needed while maintaining support for diverse use cases.

Inventive Principle:

Principle #10Preliminary action

3Measurement precision

If detailed QCL indications are provided for all resources, then CSI reporting precision is improved, but signaling overhead and processing complexity increase

Engineering Contradiction:

ImproveCSI reporting precisionVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent applies QCL (Quasi-Co-Location) relationships selectively to specific resource pairs where spatial correlation is beneficial for CSI reporting. Instead of universally applying detailed QCL indications to all resources, the system establishes QCL relationships only where needed based on the specific use case, frequency band, and resource configuration, thereby maintaining CSI precision while reducing signaling overhead.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system provides partial QCL indications through MAC CE signaling, activating only the necessary QCL relationships for currently active resources rather than configuring all possible QCL relationships. This partial action approach supplies sufficient precision for CSI reporting while avoiding the excessive signaling overhead that would result from comprehensive QCL configuration.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS11870523B2Method and apparatus for indication of reference signals in wireless systems

Publication Date: 2024.01.09 SAMSUNG ELECTRONICS CO LTD

AI summary

A method for channel state information (CSI) reporting comprises receiving, by a user equipment (UE) from a base station (BS), a medium access control (MAC) control element (CE) signaling including a quasi co-location (QCL) indication between a first resource and a second resource and activation of the second resource, wherein the UE is configured with the second resource for CSI reporting; and identifying, by the UE from the MAC-CE signaling, the activation of the second resource and a QCL relation between the first resource and the second resource based on the QCL indication.