MO SMS Access Domain Preference via AT Command in EPS/5GS

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Solution Overview

Problem

There is no AT command to support mobile originating short message service (MO SMS) access domain preference selection when a user equipment (UE) is registered in both 3GPP and non-3GPP access in 5G networks, limiting the ability to configure MO SMS preference.

Innovation Solution

A new AT command (+CADSMS=[]) is defined to specify the preferred access domain for MO SMS over NAS messages, allowing UE to select between 3GPP and non-3GPP access domains, with corresponding read and test commands to query the current and supported preferences.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If UE is registered in both 3GPP and non-3GPP access in 5G networks, then multiple access options are available for MO SMS, but no AT command exists to support access domain preference selection

Engineering Contradiction:

Improveaccess domain preference selectionVSAvoidAT command set completeness

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent extends the existing AT command framework to support multiple access domains (3GPP and non-3GPP) through a unified command structure. The +C5GSMS command is enhanced to handle both access types, allowing a single command to perform multiple functions: selecting 3GPP access, selecting non-3GPP access, and querying current preferences, thereby eliminating the need for separate commands for each access type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If existing AT Command+C5GSMS is used, then access domain preference can be selected in 5GS 3GPP and non-3GPP accesses, but MO SMS preference cannot be configured when UE is registered in EPS 3GPP access and non-3GPP access

Engineering Contradiction:

ImproveMO SMS preference configurationVSAvoidaccess domain coverage

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent modifies the behavior and parameter handling of the +C5GSMS command to accommodate EPS 3GPP access scenarios. By changing how the command interprets and applies access domain parameters, it enables MO SMS preference configuration in previously unsupported EPS + non-3GPP access combinations, while maintaining compatibility with existing 5GS operations.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12593296B2At command for MO SMS access domain preference selection

Publication Date: 2026.03.31 MEDIATEK INC

AI summary

A method of access domain preference selection for mobile originating short message service (MO SMS) using Attention (AT) command in EPS/5GS is provided. A new AT command is defined to specify the preferred access domain for UE to use for MO SMS over NAS messages when the UE supports non-3GPP access (e.g., in 5GS) and 3GPP access (e.g., in EPS/5GS). The set AT command (+CADSMS=[<access domain preference>]) is provided for the purpose of specify the access preference that the UE will use to send MO SMS over NAS message, the read AT command (+CADSMS?) returns the currently selected access preference, and a test AT command (+CADSMS=?) returns the supported access preference as a compound value.