Tunnel Gateway Managed Caching for 3GPP Traffic Offload
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Solution Overview
Problem
Conventional solutions for Selected IP Traffic Offload (SIPTO) in 3GPP access networks face challenges such as economic feasibility and security concerns, particularly when designing small nodes with PGW functionality and managing tunnel information during attach and mobility.
Innovation Solution
A lightweight caching architecture is proposed that utilizes a tunnel gateway (TGW) with a tunnel switch, controller, and mapper to redirect terminal requests to a network cache, managing tunnel mappings and ongoing flows, while maintaining compatibility with existing network nodes and minimizing modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traffic is offloaded locally at the access network to decrease operator expenses, then transport costs are reduced, but security concerns arise and architectural complexity increases
Solution Approach 1:
The patent introduces a tunnel gateway as an intermediary component that sits between the access network and the core network. This tunnel gateway manages GTP tunnels and enables local traffic offloading to caches while maintaining security by controlling and monitoring the tunnel information. The intermediary architecture allows expense reduction through local caching while preserving security through centralized tunnel management.
2Loss of energy
If small nodes with PGW functionality are designed for local traffic offloading, then transport costs decrease, but device complexity and security management become problematic
Solution Approach 1:
The patent extracts the PGW functionality from the access network nodes and places it in the core network tunnel gateway. This extraction allows local caches to handle traffic offloading without requiring complex PGW functionality at the edge. The tunnel gateway in the core network maintains the necessary tunnel management capabilities, thereby reducing device complexity at local nodes while preserving transport cost benefits.
3Reliability
If tunnel-based forwarding is used to identify terminals, then unambiguous terminal identification is achieved, but IP address translation complexity increases
Solution Approach 1:
The patent makes the tunnel gateway a universal node that handles multiple functions: GTP tunnel termination, terminal identification through TEID, IP address translation, and cache management. By consolidating these functions in a single multi-functional gateway, the system maintains reliable terminal identification through tunnel-based forwarding while reducing overall system complexity compared to having separate components for each function.
Data Source
AI summary
In an access network, a tunnel gateway (TGW) managed network caching architecture is proposed. The proposed TGW receives a terminal request directed to a data server for a flow of data. The terminal request is forwarded to the TGW through a tunnel from a tunnel endpoint located below the TGW. The TGW selects a network cache to handle the data traffic of the flow requested by the requesting terminal. The TGW then redirects the terminal request to the selected network cache to provide the requested service. The TGW redirects the terminal request through a tunnel whose endpoint is the selected network cache.