Single Tunnel QoS Differentiation in Cellular Networks
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Solution Overview
Problem
Current 3GPP EPS/LTE networks face inefficiencies in bearer setup and QoS differentiation due to the need for multiple tunnels and over-dimensioning of transport networks, leading to increased latency and signaling load, especially during handovers, as each QoS flow requires a unique TEID and lacks effective traffic prioritization.
Innovation Solution
Implementing a single tunnel with a unique identifier for multiple bearers, where each bearer has a common tunnel identifier and a unique identification component for QoS differentiation, using the DiffServ Service Classes to prioritize data within the tunnel, and modifying the GTP TEID to include a common part for the tunnel and a separate part for QoS flow identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a unique TEID is assigned to each QoS flow (bearer), then QoS differentiation is enabled, but tunnel complexity and signaling load increase
Solution Approach 1:
The TEID is segmented into two distinct components: a common TEID shared by all bearers and a bearer identifier specific to each QoS flow. This segmentation allows the system to maintain QoS differentiation through the bearer identifier while using the common TEID for tunnel management, thereby reducing signaling load and tunnel complexity.
Solution Approach 2:
The common TEID serves multiple functions by being shared across all bearers within a tunnel. It enables unified tunnel establishment, maintenance, and teardown operations, eliminating the need for separate tunnel management for each QoS flow while still allowing individual bearer identification through the bearer identifier component.
2Reliability
If multiple tunnels are established for different QoS flows, then QoS differentiation is achieved, but bearer setup delay increases
Solution Approach 1:
Multiple bearers with different QoS requirements are merged into a single tunnel by sharing the common TEID. This consolidation reduces the number of tunnel establishment operations from multiple (one per bearer) to a single operation, significantly reducing bearer setup delay while maintaining QoS differentiation through the bearer identifier component.
3Reliability
If transport networks are over-dimensioned to handle peak loads, then service reliability is improved, but network cost increases
Solution Approach 1:
QoS differentiation is implemented at the packet level within the tunnel using the bearer identifier component. This allows the transport network to handle traffic more efficiently by applying appropriate quality of service treatments to specific bearers based on their requirements, rather than over-provisioning the entire network for peak loads of all bearers simultaneously.
Data Source
Figure 1
Figure 2~4
AI summary
In a mobile or cellular telecommunications network a single tunnel between nodes 7,11,15 and 19 of the network is established to transmit data on a plurality of bearers. Each bearer transmits data relating to a particular service. The respective bearers may be identified by identification data. The identification data may indicate the priority of the data in the particular bearer. The identification data may indicate the DiffServ Service Class, DSSC, as defined in RFC 4594.