AMF Registration Request Handling for PDU Session Establishment

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Solution Overview

Problem

In 5G systems, there is a decoupling between RM and SM authorizations, leading to situations where a UE may consume battery power without receiving a service function, as PDU sessions are not established even when the UE is in an RM-registered state.

Innovation Solution

A method and apparatus for UE registration in a wireless communication system, where an access and mobility management function (AMF) receives a registration request and transmits a registration response message, including a session management (SM) message to establish a PDU session, with an indicator determining whether the PDU session establishment is required, and transfers the SM message to the SMF based on the UE's registration management (RM) state, ensuring proper PDU session establishment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If the UE performs registration procedure in RM-registered state without PDU session establishment request, then the registration is processed quickly, but the UE consumes battery power without receiving service function

Engineering Contradiction:

Improveregistration processing timeVSAvoidbattery power consumption

Core Design Contradiction:

Loss of timeVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by including an indicator in the registration request message that pre-indicates whether PDU session establishment is required. This allows the network to prepare and establish PDU sessions during the registration process itself, rather than requiring a separate session establishment procedure later. The AMF can proactively set up the PDU session based on the indicator value, ensuring service functionality is established before the UE consumes additional battery power for separate signaling.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the UE includes SM message for PDU session establishment in registration request, then PDU session can be established during registration, but the registration procedure becomes more complex

Engineering Contradiction:

Improveservice establishment efficiencyVSAvoidregistration procedure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent merges the registration procedure and PDU session establishment procedure into a single unified process. By allowing the UE to include the SM message for PDU session establishment within the registration request message, and the network to process both registration and session establishment together, the patent reduces the total number of signaling exchanges and procedures required, thereby improving overall service establishment efficiency despite the increased complexity of the individual registration message.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The registration request message is designed to serve multiple functions: it performs the standard registration function while also carrying the PDU session establishment request through the included SM message. This multi-functionality allows a single message to accomplish what would traditionally require separate signaling procedures, improving productivity by reducing the number of steps in the overall process.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If the AMF transfers SM message to SMF for all UEs, then PDU session establishment is ensured, but unnecessary processing occurs for UEs already in RM-registered state

Engineering Contradiction:

ImprovePDU session establishment reliabilityVSAvoidnetwork processing energy

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies local quality by making the SM message transfer decision specific to each UE's registration management state. The AMF checks the RM state of the UE and only transfers the SM message to the SMF when the UE is in a state where PDU session establishment is appropriate (e.g., when transitioning to RM-registered state). For UEs already in RM-registered state, the AMF handles the registration locally without unnecessary SMF involvement, thereby ensuring reliability where needed while avoiding unnecessary network processing energy consumption.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses partial action by selectively transferring the SM message to the SMF only for UEs that require PDU session establishment during registration, rather than for all UEs. The AMF evaluates the UE's state and the indicator value to determine whether partial transfer to SMF is necessary, avoiding excessive processing for cases where the PDU session is already established or not required.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP3641423B1Method for registering terminal in wireless communication system and apparatus therefor

Publication Date: 2022.04.20 LG ELECTRONICS INC

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AI summary

A method for registering a terminal of an access and mobility management function (AMF) in a wireless communication system, according to one aspect of the disclosure, comprises the steps of: receiving, from a terminal, a registration request message requesting registration of the terminal; and transmitting, to the terminal, a registration response message in response to the registration request message, wherein the registration request message may include: a session management (SM) message for requesting the establishment of a packet data unit (PDU) session for the terminal; and an indicator for indicating whether the establishment of the PDU session is essential.