UE QoS Rule Mapping for Consistent 4G-to-5G Handover
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Solution Overview
Problem
Existing methods for inter-system handover from 4G to 5G fail to provide consistent quality of service for traffic flows like VoLTE when a particular Traffic Flow Template (TFT) is associated with the EPS bearer, as they rely on default QoS rules that do not account for specific filters.
Innovation Solution
A user device and radio communication system that autonomously generates 5G QoS rules based on EPS bearer identifiers and associated filters, using pre-defined mapping information to ensure consistent QoS by associating EPS bearers with QoS flows during handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the default QoS rule association method is used for handover from 4G to 5G, then the handover procedure is simplified and processing load is reduced, but similar quality of service cannot be provided for traffic flows with particular TFT associated with EPS bearer
Solution Approach 1:
The user device preliminarily holds association information between EPS bearers and QoS flows, and preliminarily holds TFT information for traffic flow filtering. During handover, the user device autonomously generates 5G QoS rules by combining these pre-held association relationships with the pre-held TFT information, eliminating the need for real-time information exchange with 5GC while ensuring QoS consistency is maintained through the preserved filtering rules.
2Reliability
If information exchange between user device and 5GC is performed during handover to maintain QoS, then QoS consistency is ensured, but handover delay increases and processing load increases
Solution Approach 1:
The user device autonomously generates 5G QoS rules by combining pre-held association information between EPS bearers and QoS flows with pre-held TFT information, without requiring information exchange with 5GC during handover. This self-service approach maintains QoS consistency through the user device's own stored information while eliminating handover delays and processing loads associated with network-side coordination.
3Reliability
If information exchange between user device and 5GC is performed during handover to maintain QoS, then QoS consistency is ensured, but processing load increases
Solution Approach 1:
The user device autonomously generates 5G QoS rules by combining pre-held association information between EPS bearers and QoS flows with pre-held TFT information, without requiring information exchange with 5GC during handover. This self-service approach maintains QoS consistency through the user device's own stored information while eliminating handover delays and processing loads associated with network-side coordination.
Data Source
AI summary
User equipment (UE) includes a mapping information holding unit that holds association information in which are associated with each other a type of an EPS bearer set in 4G and a type of a QoS flow set in 5G and that depends on a quality of service, a filter holding unit that holds a filter of a traffic flow associated with the EPS bearer set for the UE in the 4G, and a QoS rule generating unit that generates, based on EPS Bearer ID for recognizing the type of the EPS bearer and the filter held by the filter holding unit, 5G QoS Rule associated with the QoS flow.