User Equipment Data Connection Recovery via UDP Query and NAS Trigger

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Solution Overview

Problem

Conventional user equipment experiences data connection failures when roaming between different networks or switching between 4G and 3G, requiring existing solutions to break the PDN connection and change the IP address, causing inconvenience to users.

Innovation Solution

The user equipment periodically transmits UDP query packets to a robust server via a base station, determines abnormal data connections, and recovers them using the non-access stratum protocol without breaking the PDN connection, maintaining the original IP address.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional solutions (rebooting, switching to flight mode, re-attaching GPRS, re-activating PDP) are used to recover PS data, then data connection can be recovered, but the original PDN connection is broken and IP address changes

Engineering Contradiction:

Improvedata connection recoveryVSAvoiduser convenience

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent introduces a trigger packet as an intermediary mechanism to communicate with the network side. This trigger packet, transmitted under non-access stratum protocol, signals the network to recover the data connection without requiring user equipment to break the PDN connection or change IP address, thus resolving the contradiction between connection recovery and user convenience

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If PDN connection is broken to recover PS data, then data connection can be restored, but network service continuity is interrupted

Engineering Contradiction:

Improvedata connection recoveryVSAvoidnetwork service continuity

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent implements preliminary detection by periodically transmitting UDP query packets to detect data connection abnormalities before they completely fail. When abnormality is detected, a trigger packet is sent to initiate recovery procedures while maintaining the PDN connection, ensuring network service continuity is preserved throughout the recovery process

Inventive Principle:

Principle #10Preliminary action

3Reliability

If IP address is changed during data connection recovery, then data connection can be re-established, but application services requiring fixed IP address fail

Engineering Contradiction:

Improvedata connection recoveryVSAvoidapplication service compatibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The trigger packet mechanism serves as an intermediary that enables the network side to recover the data connection and reassign IP addresses without the user equipment needing to break the PDN connection. This allows the IP address to be restored or reassigned while maintaining connection continuity, ensuring application services requiring fixed IP addresses remain compatible

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10284419B2User equipment and data connection recovery method thereof

Publication Date: 2019.05.07 MEDIATEK INC

AI summary

An user equipment and a data connection recovery method thereof are provided. The user equipment transmits at least one UDP query packets to a robust server via the base station, and determines that there is no response from the robust server during a default period. Then the user equipment determines that a data connection with a backhaul network is abnormal between the base station and the backhaul network. Accordingly, the user equipment transmits a trigger packet to the backhaul network via the base station under NAS protocol and recovers the data connection with the backhaul network.