AT Commands for 5G PDU Session Anchor Relocation

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Solution Overview

Problem

Current 3GPP TS 27.007 does not support new 5G features such as Session and Service Continuity (SSC) mode 2 and SSC mode 3 of 5G Protocol Data Unit (PDU) session operations, leading to connectivity issues during network anchor changes.

Innovation Solution

Defining AT commands for supporting SSC mode 2 and SSC mode 3 operations, including unsolicited result codes and set commands to manage PDU session anchor relocation, ensuring seamless connectivity by allowing network anchor changes without service disruption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If SSC mode 2 with break-before-make behavior is used for PDU session anchor relocation, then network flexibility and resource optimization are improved, but connectivity loss occurs during the anchor change process

Engineering Contradiction:

Improvenetwork flexibilityVSAvoidconnectivity continuity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces AT commands that enable the UE to pre-establish a new PDU session with the target network anchor before releasing the existing session. This preliminary action ensures that connectivity is maintained during the anchor relocation process, resolving the contradiction between network flexibility and connectivity continuity in SSC mode 2 operations

Inventive Principle:

Principle #10Preliminary action

2Reliability

If SSC mode 3 with make-before-break behavior is used for PDU session anchor relocation, then connectivity continuity is improved, but session management complexity increases

Engineering Contradiction:

Improveconnectivity continuityVSAvoidsession management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs AT commands as an intermediary layer between the UE and the network, standardizing the make-before-break procedure for SSC mode 3. These commands provide a structured interface that simplifies the management of dual PDU sessions, reducing the perceived complexity while maintaining connectivity continuity during anchor relocation

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If current 3GPP TS 27.007 AT command set is used, then compatibility with existing systems is maintained, but support for new 5G SSC modes 2 and 3 is lacking

Engineering Contradiction:

Improve5G feature supportVSAvoidcommand set complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent extends the existing 3GPP TS 27.007 AT command set by introducing new commands and parameters that serve multiple functions: they support both traditional LTE PDN connection procedures and new 5G PDU session procedures with SSC modes 2 and 3. This multi-functionality enables backward compatibility while adding support for advanced 5G features without requiring a complete command set overhaul

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11265771B2AT commands for supporting session and service continuity modes of 5G protocol data unitsession operations

Publication Date: 2022.03.01 HFI INNOVATION INC

AI summary

A method of defining ATtention (AT) commands for supporting Service and Session Continuity (SSC) mode 2 and SSC mode 3 of 5G Protocol Data Unit (PDU) session operations is proposed. The AT command can be a notification of an unsolicited result code +CGEV: NW PDN DEACT, +CGEV: NW MODIFY, or +CGEV: ME PDN ACT, or a configuration command +CGDCONT with additional 5G parameters. Additional 5G parameters include an SSC, an old CID, a change reason and a PDU lifetime for the purpose of communicating information regarding the request of PDU session anchor relocation.