RRC-Inactive MT-SDT Signaling With Combined Msg4 Delivery

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Solution Overview

Problem

Existing 3GPP standards do not effectively support Mobile Terminated Small Data Transmission (MT-SDT) in the RRC-INACTIVE state, leading to inefficient signaling overhead and resource wastage due to separate transmission of MT-SDT data and RRC Release messages.

Innovation Solution

Enhanced signaling procedures involving gNB-CU-CP identifying MT-SDT bearers, initiating paging with context setup, and simultaneously consolidating RRC Release and MT-SDT data in Msg4, ensuring resources are not unnecessarily held.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate transmission of MT-SDT data and RRC Release messages is used, then transmission reliability is improved, but signaling overhead increases and resource efficiency deteriorates

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines MT-SDT data and RRC Release message into a single Msg4 transmission from gNB-DU to UE. This merging eliminates separate signaling transmissions, reducing signaling overhead while maintaining transmission reliability through unified message delivery in the inactive state

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If separate transmission of MT-SDT data and RRC Release messages is used, then transmission reliability is improved, but resource usage efficiency deteriorates due to unnecessary resource holding

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidresource usage efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

By merging MT-SDT data and RRC Release into single Msg4 transmission, the patent enables simultaneous delivery of both messages, allowing resources to be released immediately after unified transmission rather than being held for separate transmissions, thus improving resource usage efficiency

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If RRC connection establishment is performed for small data transmission, then transmission reliability is improved, but energy consumption increases due to signaling overhead

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent merges MT-SDT data transmission with RRC Release in the inactive state, eliminating the need for separate RRC connection establishment procedures. This unified approach maintains transmission reliability while significantly reducing the energy consumption associated with full connection setup signaling overhead

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12432611B2Method to support mobile terminated small data transmission in radio resource control inactive state

Publication Date: 2025.09.30 NOKIA TECHNOLOGIES OY

AI summary

In accordance with example embodiments of the invention there is at least a method enabling a message 4 from a network node distributed unit to a small data transmission user equipment to include information of both small data payload and a radio resource control release.