Access Network Paging Failure Handling via Core Network Fallback

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Solution Overview

Problem

In 5G systems, paging failures in the access network lead to low data transmission reliability, as the network often discards downlink data when paging fails, and existing methods do not effectively address these failures.

Innovation Solution

A method where the access network device determines paging failures based on timer duration or maximum count of paging messages and notifies the Core Network (CN) device, allowing the CN to initiate paging instead, thereby improving data transmission reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the access network device initiates paging to the terminal device, then the terminal device can be located and data transmission can proceed, but paging failures occur reducing data transmission reliability

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidpaging failure

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The access network device performs preliminary paging attempts and monitors for responses before data transmission. If paging fails initially, the system has already prepared fallback mechanisms (CN device paging capability) to ensure reliability, rather than waiting for transmission failures to occur

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The CN device acts as an intermediary backup paging mechanism. When the access network device's paging attempts fail, the CN device can initiate paging as a mediator to locate the terminal device, ensuring data transmission reliability without requiring the access network device to succeed on the first attempt

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the access network device continuously re-initiates paging, then the terminal device may be reached, but network resources are wasted and transmission time is extended

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidpaging time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system dynamically switches between two paging mechanisms: the access network device initiates paging first, and only if that fails does it transition to using the CN device for paging. This dynamic adaptation optimizes the balance between reliability and time loss by using the faster access network paging when possible and the more reliable CN paging only when necessary

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The access network device monitors the response to its paging messages and uses this feedback to determine whether to continue paging or switch to CN device paging. If no response is received within expected timeframes, the feedback mechanism triggers the fallback to CN device-initiated paging, avoiding indefinite retry cycles

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11350385B2Paging failure processing method, access network device, and core network device

Publication Date: 2022.05.31 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

A paging failure processing method, an access network device, and a core network device are provided. The method includes: in a case in which downlink data of a terminal device needs to be transmitted, an access network device determines that a paging initiated by the access network to the terminal device failed; and the access network device transmits first indication information to a core network device, the first indication information being used for indicating that the paging initiated by the access network device to the terminal device failed.