Resumption Identifier for NB-IoT Connection Context Transfer

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In communication systems, particularly in NB-IoT, the temporary suspension and resumption of connections between radio terminals and networks pose challenges, especially when a radio terminal transitions to a new base station without the holding context information, leading to increased signaling and potential resumption failures.

Innovation Solution

A communication method where a resumption identifier associated with context information is transmitted from a first base station to a radio terminal during temporary suspension, allowing the terminal to determine if the connection can be resumed and facilitating the transfer of context information between base stations to maintain connection integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a radio terminal transitions to a new base station after temporary suspension, then mobility is improved, but connection resumption reliability deteriorates because the new base station does not hold context information

Engineering Contradiction:

ImprovemobilityVSAvoidconnection resumption reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces a resumption identifier as an intermediary element that bridges the radio terminal and the original base station. When the terminal moves to a new base station, it provides this identifier, which enables the new base station to retrieve context information from the original base station through network coordination, thus maintaining connection reliability during mobility

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The resumption identifier acts as a copy or reference to the original context information. Instead of requiring the new base station to store and manage the entire context information, the system uses this identifier copy to reference and retrieve the necessary context from the original base station when needed

Inventive Principle:

Principle #26Copying

2Reliability

If context information is transferred between base stations to maintain connection integrity, then connection resumption reliability is improved, but signaling overhead increases

Engineering Contradiction:

Improveconnection resumption reliabilityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent extracts only the essential resumption identifier from the complete context information and transmits it to the radio terminal during suspension. This extracted identifier is sufficient for the terminal to initiate context retrieval later, avoiding the need to transfer the entire context information set and reducing signaling overhead

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system performs preliminary action by providing the resumption identifier to the terminal during the suspension phase, before any potential mobility occurs. This preliminary provision of identification information enables efficient context retrieval later without requiring extensive signaling at the time of resumption

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10893567B2Communication method, radio terminal, processor, and base station

Publication Date: 2021.01.12 KYOCERA CORP

AI summary

In a communication method according to an embodiment, in a procedure where a connection between a radio terminal and a network is temporarily suspended, a resumption identifier associated with context information of the radio terminal is transmitted from a first base station to the radio terminal. A part of the resumption identifier is information for identifying the first base station.