Terminal Device SSB Usability Check for CG-SDT

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Solution Overview

Problem

In the New Radio (NR) system, terminal devices face challenges in determining whether to perform Configured Grant (CG) resource-based Small Data Transmission (SDT) or Random Access process-based SDT when in an RRC INACTIVE state, leading to inefficient beam selection and increased power consumption and signaling overhead.

Innovation Solution

A method where the terminal device determines whether Synchronization Signal Blocks (SSBs) in a first beam set are usable for CG-SDT and, if so, performs CG-SDT preferentially, allowing for more efficient beam selection during Small Data Transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the terminal device performs beam selection for SDT without determining SSB usability, then the transmission can proceed quickly, but the beam selection efficiency is poor and power consumption increases

Engineering Contradiction:

Improvetransmission speedVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The terminal device performs preliminary determination of SSB usability before executing the SDT transmission. By checking whether SSBs in the first beam set are usable for CG-SDT in advance, the device avoids performing unnecessary beam selection procedures, thereby reducing power consumption while maintaining transmission speed.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If the terminal device performs full beam selection procedure, then beam selection coverage is comprehensive, but signaling overhead increases

Engineering Contradiction:

Improvebeam selection coverageVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The terminal device extracts and utilizes pre-configured beam information from the first beam set when SSBs are determined to be usable for CG-SDT. By taking out and reusing this pre-configured information, the device avoids performing the complete beam selection procedure, thereby reducing signaling overhead while maintaining adequate beam selection coverage.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If the terminal device determines SSB usability before CG-SDT, then beam selection efficiency improves, but additional processing time is required

Engineering Contradiction:

Improvebeam selection efficiencyVSAvoidprocessing time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The usability determination of SSBs is performed as a preliminary check that leverages pre-configured information from the first beam set. This preliminary action requires minimal processing time compared to full beam selection, thereby improving beam selection efficiency without introducing significant additional processing delays.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20240023070A1Wireless communication method and terminal device

Publication Date: 2024.01.18 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

The embodiments of the present disclosure provide a wireless communication method and a terminal device. After a Small Data Transmission (SDT) is triggered by a higher layer, a terminal device can determine whether SSBs in a first beam set can be used for a Configured Grant resource based SDT (CG-SDT), and if so, perform the CG-SDT preferentially. The wireless communication method includes: determining, by a terminal device, whether Synchronization Signal Blocks (SSBs) in a first beam set are usable for a CG-SDT.