MT-SDT Transmission Mode Selection for Low-Delay Network Access

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Solution Overview

Problem

In mobile terminate small data transmission (MT-SDT), existing methods waste network resources and cause long access delays due to the smaller size of MT-SDT data compared to mobile original small data transmission (MO-SDT) and the preference for configured grant (CG) resources.

Innovation Solution

A method for determining the priority of transmission ways for MT-SDT, including CG and random access, based on information from the network device or predefined criteria, to select the most efficient way for transmitting MT-SDT data, considering delay requirements and resource availability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the selection procedure for MO-SDT transmission way is fully reused for MT-SDT, then the implementation complexity is reduced, but network resources are wasted due to the smaller size of MT-SDT data

Engineering Contradiction:

Improveimplementation complexityVSAvoidnetwork resource waste

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The patent applies local quality by differentiating the transmission way selection for MT-SDT from MO-SDT. Specifically, when MT-SDT data size is smaller than a threshold, the terminal preferentially selects random access resources instead of configured grant resources, creating a localized adaptation rule that matches the actual data transmission needs and avoids network resource waste

Inventive Principle:

Principle #3Local quality

2Reliability

If configured grant resources are preferred for MT-SDT transmission, then the transmission reliability is improved, but the access delay increases

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidaccess delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements dynamics by making the transmission way selection adaptive rather than static. The terminal dynamically adjusts the preference between configured grant and random access resources based on real-time conditions including data size, delay requirements, and network configuration, allowing the system to optimize between reliability and access delay according to specific transmission scenarios

Inventive Principle:

Principle #15Dynamics

3Loss of time

If dedicated random access resources are allocated for MT-SDT, then the access delay is reduced, but the device complexity and resource management difficulty increase

Engineering Contradiction:

Improveaccess delayVSAvoidresource management complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent applies universality by enabling random access resources to serve dual purposes: they function as dedicated resources for MT-SDT when needed, and as shared resources for general random access procedures. This multi-functionality approach allows the system to reduce access delay for MT-SDT while avoiding the complexity of completely separate resource management mechanisms

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260107320A1Small data transmission method, terminal, device and storage medium

Publication Date: 2026.04.16 DATANG MOBILE COMM EQUIP CO LTD

AI summary

The present disclosure provides a small data transmission method, a terminal, a device and a storage medium. The method includes determining a transmission mode of MT-SDT data, and the transmission mode includes a CG-based first mode and a random access-based second mode; and when it is determined that an MT-SDT process is triggered, sending an RRC recovery request message to the network device on the basis of the determined transmission mode.