Inter-RAT Ping Pong Handover Detection via Control Node

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Solution Overview

Problem

Current technologies face challenges in efficiently detecting and resolving ping pong handovers between LTE and GERAN/UTRAN networks, particularly due to limitations in using UE History Information and internal LTE analysis, leading to inefficient prevention of recurring ping pong events.

Innovation Solution

A control node associated with the target RAT network determines IRAT ping pong handover information, evaluates handover requests, and provides indications to base stations in the source RAT network to adjust mobility parameters and prevent future handovers, using IRAT measurement configuration and handover time periods to identify and address ping pong scenarios.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If UE History Information and internal LTE analysis are used to detect ping pong handovers, then detection capability is provided, but detection efficiency and effectiveness are insufficient leading to recurring ping pong events

Engineering Contradiction:

Improveping pong handover detection accuracyVSAvoidhandover detection efficiency

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent introduces a control node in the target RAT network as an intermediary to assist in detecting ping pong handovers. This control node receives handover request information from the source RAT base station, evaluates it against stored handover history information, and provides detection results. This intermediary mechanism enables more accurate and efficient detection compared to relying solely on UE History Information and internal LTE analysis.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If handover prevention measures are implemented based on limited detection information, then some ping pong events can be avoided, but recurring ping pong events continue to occur due to insufficient detection

Engineering Contradiction:

Improvehandover stabilityVSAvoiddetection coverage

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The control node in the target RAT network performs multiple functions: it stores handover history information, evaluates incoming handover requests against this history, and provides detection results to prevent ping pong events. This multi-functional approach enhances both the reliability of handover stability and the adaptability of detection coverage, preventing recurring ping pong events that previous single-function mechanisms failed to address.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9503944B2Methods and apparatus for detecting possible repeated handover different radio access technologies

Publication Date: 2016.11.22 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Inter-radio access technology (IRAT) ping pong handover of a user equipment (UE) connection between a source radio access technology (RAT) communications network, e.g., LTE, and a different target RAT communications network, e.g., UTRAN, is detected. A control node determines IRAT ping pong handover information and evaluates an IRAT handover request message for the UE connection from the source RAT network with respect to the handover ping pong information. Based thereon, the node determines that the UE connection meets one or more ping pong conditions associated with the handover ping pong information and provides an indication of an IRAT ping pong handover condition to a base station in the source RAT network to allow the base station to make mobility adjustments.