RRC Inactive UE Data Transmission Before Connection Resume

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Solution Overview

Problem

In the RRC inactive state, terminals experience significant transmission delays when sending data due to the need to resume the RRC connection, which is inefficient in small packet scenarios.

Innovation Solution

A data transmission method that allows a UE in the RRC inactive state to send data and an RRC resume request message directly to a base station or centralized unit, followed by an RRC release message, thereby advancing the timing of data transmission and reducing delays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal performs connection resume to send data in RRC inactive state, then the connection is established properly, but the transmission delay increases

Engineering Contradiction:

Improveconnection establishmentVSAvoidtransmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by allowing the UE to send data before completing the full RRC connection resume process. The UE can transmit data in the RRC inactive state using previously established context, and only performs the full connection resume when needed, thereby reducing transmission delay while maintaining connection reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent segments the RRC connection resume process into optional and mandatory steps. The UE can optionally send data immediately in inactive state without completing the full resume procedure, and only performs the complete connection establishment when necessary, thus separating the data transmission function from the full connection resume function.

Inventive Principle:

Principle #1Segmentation

2Productivity

If the terminal enters RRC connected state to send data, then data transmission can occur, but power consumption increases

Engineering Contradiction:

Improvedata transmission capabilityVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent enables the UE to perform data transmission in the RRC inactive state using previously established context and resources, avoiding the need to transition to RRC connected state. This preliminary action allows data transmission without the power consumption associated with full connection establishment and maintenance.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The UE utilizes its own previously established context and resources in the RRC inactive state to perform data transmission independently, without requiring the full RRC connection resume process. This self-service capability allows the UE to transmit data using existing configurations, avoiding the additional power consumption of re-establishing connections.

Inventive Principle:

Principle #25Self-service

3Stability of the object's composition

If the terminal waits to resume connection before sending data, then connection is stable, but transmission timing is delayed

Engineering Contradiction:

Improveconnection stabilityVSAvoidtransmission timing

Core Design Contradiction:

Stability of the object's compositionVSLoss of time

Solution Approach 1:

The patent allows the UE to perform data transmission as a preliminary action before completing the RRC connection resume process. The UE can send data in the RRC inactive state using previously established context, and only performs the full connection resume when needed, thereby advancing transmission timing while maintaining connection stability through proper resume completion when necessary.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12426123B2Provide data transmission to avoid large transmission delay

Publication Date: 2025.09.23 CHINA MOBILE COMM GRP CO LTD

AI summary

A data transmission method includes: a terminal in an RRC inactive state transmits a data packet and an RRC resume request to a first base station or the CU of the first base station or the DU of the first base station; receive an RRC release message transmitted by the first base station or the CU of the first base station or the DU of the first base station.