MT-SDT Paging Enhancement via Segmented Xn Interface

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Solution Overview

Problem

The existing Xn RAN paging procedure cannot support mobile terminating small data transmission (MT-SDT) because it cannot identify MT-SDT when a user equipment (UE) leaves the last serving gNB and camps on a cell controlled by another gNB within the RAN-based Notification Area (RNA).

Innovation Solution

A first network node, equipped with a processor and a transceiver, receives information associated with MT-SDT from a second network node and determines whether to indicate MT-SDT to the UE based on this information. This determination can be made by analyzing various information elements such as downlink data size, SDT configurations, and network node responsibilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the existing Xn RAN paging procedure is used, then the paging message can be transmitted between gNBs, but it cannot identify MT-SDT when UE moves between gNBs within RNA

Engineering Contradiction:

ImproveMT-SDT identification capabilityVSAvoidSupport for UE mobility between gNBs

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The paging message is segmented to include separate information elements: one for traditional paging and another for MT-SDT indication. This allows the network to selectively indicate MT-SDT capability while maintaining backward compatibility with existing paging procedures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

An intermediary information element is introduced in the paging message that carries MT-SDT indication. This intermediary element acts as a mediator between the traditional paging function and the new MT-SDT requirement, enabling both functions to coexist without conflict.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the RAN paging message includes detailed MT-SDT information elements, then MT-SDT can be properly identified and managed, but the message complexity increases

Engineering Contradiction:

ImproveMT-SDT indication accuracyVSAvoidPaging message structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The MT-SDT indication is extracted as a separate, optional information element from the traditional paging message structure. This extraction approach allows MT-SDT information to be included only when needed, avoiding unnecessary complexity in standard paging operations while enabling reliable MT-SDT identification when required.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20250056646A1Methods and apparatuses for paging enhancement in mt-sdt

Publication Date: 2025.02.13 LENOVO (BEIJING) LTD

AI summary

The present application relates to methods and apparatuses for paging enhancement in mobile terminating small data transmission (MT-SDT). One embodiment of the present disclosure provides a first network node, which includes: a processor; a transceiver coupled to the processor, wherein the processor is configured to: receive, via the transceiver, first information associated with mobile terminating small data transmission (MT-SDT) for a user equipment (UE) from a second network node; and determine whether or not to indicate the MT-SDT to the UE based on at least the first information received from the second network node.