Base Station Handover Result Feedback for Dual Connectivity

Solution Overview

Problem

In a system with a gNB connected to a Next Generation Core Network (NGCN) and an eNB connected to an Evolved Packet Core (EPC), unsuitable selection of a secondary base station (SeNB/SgNB) during dual connectivity after an intersystem handover can lead to frequent dual connectivity release processing and re-execution, deteriorating user experience and increasing network processing load, with no efficient solution discussed for intersystem handovers from 5G to LTE networks.

Innovation Solution

A first base station communicates with a terminal apparatus using a first radio access technology, obtains handover result information, and transmits this information to a second base station using a second radio access technology, allowing the second base station to perform communication processing and appropriately select a secondary base station for dual connectivity based on the handover results.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If dual connectivity is established after intersystem handover without considering handover results, then throughput can be improved, but frequent dual connectivity release processing occurs and network processing load increases

Engineering Contradiction:

ImprovethroughputVSAvoiddual connectivity stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The source base station performs preliminary actions by obtaining handover result information before the handover is completed, and transmits this information to the target base station in advance. This allows the target base station to make informed decisions about dual connectivity establishment, preventing future connectivity issues and reducing the need for release processing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where handover result information is collected from previous handover attempts and fed back to the target base station. This feedback loop enables the network to learn from past handover outcomes and make better decisions about secondary base station selection, improving dual connectivity stability.

Inventive Principle:

Principle #23Feedback

2Quantity of substance

If dual connectivity is established after intersystem handover without considering handover results, then capacity can be increased, but user experience deteriorates due to frequent releases

Engineering Contradiction:

Improvenetwork capacityVSAvoiduser experience

Core Design Contradiction:

Quantity of substanceVSEase of operation

Solution Approach 1:

The source base station performs preliminary actions by obtaining handover result information before the handover is completed, and transmits this information to the target base station in advance. This allows the target base station to make informed decisions about dual connectivity establishment, preventing future connectivity issues and reducing the need for release processing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where handover result information is collected from previous handover attempts and fed back to the target base station. This feedback loop enables the network to learn from past handover outcomes and make better decisions about secondary base station selection, improving dual connectivity stability.

Inventive Principle:

Principle #23Feedback

3Quantity of substance

If dual connectivity is established after intersystem handover without considering handover results, then network capacity can be enhanced, but network processing load increases

Engineering Contradiction:

Improvenetwork capacityVSAvoidnetwork processing load

Core Design Contradiction:

Quantity of substanceVSUse of energy by stationary object

Solution Approach 1:

The source base station performs preliminary actions by obtaining handover result information before the handover is completed, and transmits this information to the target base station in advance. This allows the target base station to make informed decisions about dual connectivity establishment, preventing future connectivity issues and reducing the need for release processing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where handover result information is collected from previous handover attempts and fed back to the target base station. This feedback loop enables the network to learn from past handover outcomes and make better decisions about secondary base station selection, improving dual connectivity stability.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11057807B2First base station, second base station, and method

Publication Date: 2021.07.06 NEC CORP

AI summary

In order to make it possible to appropriately select a secondary base station in a case of establishing dual connectivity after a handover, a base station 100 includes: a memory storing instructions; and one or more processors configured to execute the instructions to: communicate with a terminal apparatus 300 in accordance with a first radio access technology; obtain handover result information related to results of handovers from the base station 100 to other base stations 10, 20, 30, and 40; and transmit, when the terminal apparatus 300 performs a handover from the base station 100 to a base station 200 communicating in accordance with a second radio access technology, the handover result information to the base station 200.