UE PDU Session Resource Management via QoS Rule Selection

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Solution Overview

Problem

In 5G mobile communication systems, user equipment (UE) may face insufficient resources to establish PDU sessions due to the network's request for new QoS rules and flows, leading to potential failures in setting up authorized QoS flow descriptions and packet filters.

Innovation Solution

The UE initiates a PDU session release procedure or synchronizes with the network by sending a PDU session modification request with a cause code indicating 'insufficient resources' to manage resource constraints, allowing for the deletion of excess QoS rules and flow descriptions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the network requests new QoS rules and flows during PDU session establishment, then the QoS management capability is improved, but the UE resource consumption increases beyond available capacity

Engineering Contradiction:

ImproveQoS management capabilityVSAvoidUE resource capacity

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The UE establishes the PDU session with a subset of the requested QoS rules and flows that can be supported with available resources, rather than attempting to establish all requested QoS configurations. This partial establishment allows the session to become operational with reduced QoS capability, preventing complete failure while managing resource constraints.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The QoS rules and flows requested by the network are divided into two segments: those that can be established given current UE resources, and those that cannot. The UE establishes the feasible segment and defers or rejects the infeasible segment, allowing progressive QoS configuration as resources become available.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the UE rejects new QoS flow descriptions or QoS rules due to insufficient resources, then resource overload is prevented, but the PDU session establishment fails

Engineering Contradiction:

ImproveResource management stabilityVSAvoidPDU session establishment success rate

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Instead of completely rejecting the PDU session establishment due to insufficient resources for all requested QoS rules, the UE establishes the session with the subset of QoS configurations that can be supported, achieving partial success rather than total failure.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The resource constraint that would normally cause complete rejection is converted into an opportunity for selective QoS configuration. The UE uses available resources efficiently to establish a functional PDU session with reduced QoS capability, turning a potential failure into a partially successful establishment.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Quantity of substance

If the UE deletes certain QoS rules or flow descriptions to synchronize with the network, then resource constraints are managed, but the session configuration complexity increases

Engineering Contradiction:

ImproveActive QoS rules and flowsVSAvoidSession configuration management

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The UE extracts and removes the infeasible QoS rules and flow descriptions from the session configuration, keeping only those that can be established with available resources. This extraction process simplifies the overall configuration by eliminating the problematic elements rather than managing a complex mix of feasible and infeasible rules.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The UE discards the QoS rules and flows that cannot be established due to resource constraints, and reserves the option to recover or add them later when resources become available. This discarding approach simplifies current configuration management while preserving future flexibility.

Inventive Principle:

Principle #34Discarding and recovering

Data Source

PatentUS11240699B2Insufficient resources in the UE during PDU session establishment procedure

Publication Date: 2022.02.01 HFI INNOVATION INC

AI summary

A method of handling insufficient resources in a user equipment (UE) during a PDU session establishment procedure is proposed. During a PDU session establishment procedure, UE sends a PDU SESSION ESTABLISHMENT REQUEST message to the network. UE then receives a PDU SESSION ESTABLISHMENT ACCEPT message from the network, the ACCEPT message carries various PDU session parameters including authorized QoS rules and QoS flows. If UE decides to reject the addition of the new authorized QoS flow description or the new authorized QoS rule due to lack of resources, UE may initiate a PDU session release procedure with 5G session management (5GSM) cause IE #26 “insufficient resources”. In an alternative embodiment, UE may synchronize with the network by sending a PDU session modification request message to delete certain QoS rules/flow descriptions with 5GSM cause IE #26 “insufficient resources”.