Wireless Handover Dual Handshake for RRC Re-Establishment Avoidance

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Solution Overview

Problem

Existing wireless communication systems experience long data interruptions due to failed handovers (HO) in Radio Resource Control (RRC) Connected states, necessitating enhancements to reduce interruption delays and improve handover success rates.

Innovation Solution

A method involving dual handshake processes for target cells during handover, where successful completion of either process prevents RRC connection re-establishment, thereby reducing the need for re-establishment and minimizing interruptions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional single-handshake handover procedure is used, then procedure simplicity is maintained, but handover success rate decreases and data interruption increases

Engineering Contradiction:

Improvehandover success rateVSAvoidhandover procedure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The handover procedure is segmented into multiple independent handshake processes (first handshake process with first target cell, second handshake process with second target cell). Each handshake process operates independently, allowing the system to try multiple target cells without requiring all to succeed. This segmentation increases reliability by providing multiple failure recovery paths while maintaining manageable complexity through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system performs preliminary handshake processes with multiple target cells before the actual handover execution. By pre-establishing connection handshakes with backup target cells, the system prepares failure recovery paths in advance. This preliminary action ensures that when the primary handover fails, the UE can quickly switch to a pre-prepared backup target cell, reducing data interruption time.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If RRC connection re-establishment procedure is performed after handover failure, then connection reliability is restored, but data interruption time increases

Engineering Contradiction:

Improveconnection reliabilityVSAvoiddata interruption time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system performs connection handshake processes with multiple target cells in advance before actual handover execution. By pre-establishing these handshakes, the system prepares backup connection paths ahead of time. When handover fails, the UE can immediately switch to a pre-prepared backup target cell without waiting for time-consuming re-establishment procedures, thus reducing data interruption time while maintaining connection reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements beforehand cushioning by establishing multiple backup handshakes with different target cells before the critical handover moment. These backup handshakes act as a cushion against handover failure, providing immediate fallback options. This cushioning mechanism ensures that when the primary handover fails, the system can quickly recover without experiencing long data interruption periods.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If multiple target cells are configured for handover, then handover success rate improves, but mobility control complexity increases

Engineering Contradiction:

Improvehandover success rateVSAvoidmobility control complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The mobility control complexity is segmented into independent handshake processes for each target cell. Each handshake process is a self-contained unit that can be executed independently. This segmentation allows the system to manage multiple target cells through modular procedures, reducing overall complexity while maintaining the ability to switch between cells for improved handover success rate.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically selects which handshake process to execute based on real-time conditions. Instead of rigidly following a fixed sequence, the UE can dynamically switch between different target cells based on handshake status and network conditions. This dynamic approach provides flexibility in managing multiple target cells while adapting to changing network conditions, effectively managing complexity.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12593252B2Method and device used in communication node for wireless communication

Publication Date: 2026.03.31 APOGEE 5G GLOBAL LLC

AI summary

The present application discloses a method and a device used in a communication node for wireless communications. The communication node receives a first signaling, the first signaling being used for indicating at least a first target cell and a second target cell; and performs a first handshake process for the first target cell; and performs a second handshake process for the second target cell; and determines whether to initiate an RRC connection re-establishment procedure according to whether at least one of the first handshake process or the second handshake process is successfully completed; neither the first handshake process nor the second handshake process being successfully completed is used to determine to initiate the RRC connection re-establishment procedure; either the first handshake process or the second handshake process being successfully completed is used to determine not to initiate the RRC connection re-establishment procedure.