Roaming QoS Handling Using Candidate 5QI Selection
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Solution Overview
Problem
Existing communication networks face challenges in efficiently handling Quality of Service (QoS) during home routed roaming due to mismatched QoS indicators, leading to potential PDU session rejections and poor user experience.
Innovation Solution
Implementing a list of QoS configuration options, including vplmnQoS attribute candidates and 5QI candidates, to be provided by a Visited Public Land Mobile Network (VPLMN) to a Home Public Land Mobile Network (HPLMN) based on roaming agreements, allowing the HPLMN to select appropriate QoS configurations for PDU sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the V-SMF provides only one set of VPLMN QoS data with one vplmn 5QI to the H-SMF, then the QoS configuration is simple, but the authorized 5QI by H-PCF may not match the vplmn 5QI, leading to PDU session rejection
Solution Approach 1:
The patent segments the QoS configuration by providing multiple candidate 5QI values instead of a single value. The V-SMF includes a list of candidate 5QI values in the PDU session create request, allowing the H-SMF to select from multiple options rather than being constrained to one configuration, thereby reducing rejection risk while maintaining manageable complexity
Solution Approach 2:
The patent changes the parameter structure by transitioning from a single 5QI value to a list of candidate 5QI values. This parameter transformation enables the H-SMF to match against multiple possibilities, increasing the likelihood of finding a compatible configuration that satisfies both VPLMN requirements and H-PCF authorization
2Adaptability or versatility
If multiple QoS configuration options are provided from VPLMN to HPLMN, then the flexibility and success rate of PDU session establishment improve, but the complexity of QoS handling increases
Solution Approach 1:
The patent applies preliminary action by pre-compiling and providing a list of candidate 5QI values from the V-SMF to the H-SMF before the actual PDU session establishment. This advance preparation enables the H-SMF to quickly select from pre-validated options during session setup, achieving flexibility without proportionally increasing handling complexity
Solution Approach 2:
The H-SMF acts as an intermediary between the V-SMF and H-PCF, receiving multiple candidate 5QI values from the V-SMF and selecting the most appropriate one based on local policies and user subscription data before presenting to H-PCF for authorization. This intermediary role distributes the complexity management across network functions
Data Source
AI summary
Various embodiments of the present disclosure provide a method for quality of service (QoS) handling. The method which may be performed by a first network node serving a first network comprises: receiving a first message transmitted by a second network node serving a second network. The first message indicates a list of candidate values provided for a QoS attribute of a session by the second network according to an agreement between the first network and the second network. In accordance with an exemplary embodiment, the method further comprises: obtaining a value for the QoS attribute of the session selected from the list of the candidate values.