Wireless Handover Failure Handling via Source Connection Maintenance

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Solution Overview

Problem

During handover processes in wireless communication systems, especially in high-speed mobile scenarios, frequent handovers and failures lead to data transmission delays due to the need for Radio Resource Control (RRC) connection reestablishment when a terminal device fails to access a target base station.

Innovation Solution

The terminal device sends indication information to the source network device when it fails to access the target network device, maintaining a connection with the source network device to avoid RRC connection reestablishment, allowing the source network device to continue using the established connection for communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal device initiates RRC connection reestablishment process when handover fails, then the connection can be restored, but data transmission delays increase

Engineering Contradiction:

Improveconnection restorationVSAvoiddata transmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The source base station performs preliminary actions by maintaining the RRC connection in a suspended state during handover failure and proactively initiates connection recovery procedures, preventing the need for lengthy reestablishment processes and reducing data transmission delays

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal device provides feedback to the source base station about handover failure status, enabling the base station to adjust its behavior and maintain the connection rather than proceeding with connection release, thus avoiding reestablishment delays

Inventive Principle:

Principle #23Feedback

2Reliability

If the terminal device switches to target base station during handover, then communication continuity is improved, but connection stability deteriorates when switch fails

Engineering Contradiction:

Improvecommunication continuityVSAvoidconnection stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The source base station prepares cushioning measures by maintaining the RRC connection in a suspended state and keeping contextual information, providing a safety net that prevents complete connection loss when handover fails, thus stabilizing the connection state

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The connection state is made dynamic, transitioning between active, suspended, and recovered states based on handover progress, allowing the system to adapt to different scenarios and maintain stability while enabling communication continuity

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12177921B2Wireless communication method, terminal device and network device

Publication Date: 2024.12.24 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

A wireless communication method, a terminal device, and a network device, the method including: a terminal device sends indication information to a first network device, where the indication information is used to indicate that the terminal device fails to switch to a second network device.