User Terminal Semi-Persistent CSI Reporting Contention Control

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Solution Overview

Problem

In future radio communication systems, such as NR, the contention between Semi-Persistent CSI (SP-CSI) reporting and UL data transmission can lead to throughput reduction unless an appropriate scheme is established to manage this contention.

Innovation Solution

A user terminal is equipped with a transmitting section that uses a semi-persistently specified resource for CSI reporting and a control section that manages the transmission of CSI and data during overlapping time durations, allowing for contention avoidance through methods like piggybacking or resource prioritization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a UE uses a semi-persistently specified resource to report CSI, then CSI reporting efficiency is improved, but resource contention with UL data transmission occurs

Engineering Contradiction:

ImproveCSI reporting efficiencyVSAvoidresource contention

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent implements dynamic control of SP-CSI reporting by introducing a configurable parameter that allows the UE to selectively disable SP-CSI reporting when uplink data transmission is detected. This dynamic adjustment mechanism enables the system to adapt between maintaining semi-persistent reporting (for efficiency) and avoiding conflicts with data transmission (for harm reduction), resolving the contradiction between improved productivity and reduced harmful effects.

Inventive Principle:

Principle #15Dynamics

2Stability of the object's composition

If SP-CSI reporting timing is fixed semi-persistently, then reporting consistency is improved, but throughput reduction occurs due to timing contention

Engineering Contradiction:

Improvereporting consistencyVSAvoidthroughput

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

The patent introduces dynamic control mechanisms that allow the SP-CSI reporting timing to be adjusted based on uplink data transmission status. When data transmission is detected in the scheduled SP-CSI resources, the UE can disable reporting or shift timing, thereby preventing throughput reduction while maintaining reporting consistency during normal operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent employs parameter changes by introducing a configurable disablement parameter that modifies the SP-CSI reporting behavior. This parameter allows the system to switch between consistent semi-persistent reporting and adjusted reporting based on data transmission conditions, effectively resolving the contradiction between reporting consistency and throughput maintenance.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11791879B2Terminal, base station, radio communication method, and system for controlling semi-persistent channel state information reporting

Publication Date: 2023.10.17 NTT DOCOMO INC

AI summary

A user terminal according to one aspect of the present disclosure includes a transmitting section that transmits channel state information by use of a semi-persistently specified resource, and a control section that controls, in a case of transmitting data during a time duration in which the semi-persistently specified resource is included, transmission of the channel state information and the data. According to one aspect of the present disclosure, SP-CSI reporting can be appropriately controlled.