VLAN Mappings for Wireless Access Gateway Packet Forwarding
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Solution Overview
Problem
The increasing demand for data services from wireless devices strains mobile networks, leading to delayed or lost communications, and existing technologies struggle to efficiently manage overlapping Layer 3 address pools in wireless local area networks (WLANs) within mobile service provider networks.
Innovation Solution
The implementation of virtual local area networks (VLANs) to facilitate packet forwarding between wireless endpoint devices attached to WLAN access networks and mobile gateways, allowing for unique VLAN identifiers to be assigned to combinations of Access Point Names (APNs) and Layer 3 addresses, enabling efficient packet forwarding and management of overlapping address pools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional packet forwarding methods are used in WLAN access networks, then basic data transmission is supported, but network efficiency deteriorates and communication delays increase due to inability to efficiently manage overlapping Layer 3 address pools
Solution Approach 1:
The patent introduces VLAN identifiers as an intermediary layer between Layer 2 wireless access and Layer 3 addressing. The wireless access gateway uses VLAN tags to carry APN information, enabling efficient packet forwarding without requiring complex Layer 3 address pool management. This intermediary mechanism allows packets to be routed based on VLAN tags rather than deep packet inspection of Layer 3 addresses, thereby improving network efficiency and reducing communication delays.
2Adaptability or versatility
If mobile networks handle increasing data service demand, then more wireless devices can be served, but network resources become strained leading to delayed or lost communications
Solution Approach 1:
The patent segments the mobile network traffic into distinct VLANs based on APN combinations. Each VLAN represents a logical separation of traffic flows, allowing the network to handle multiple data services simultaneously with different QoS requirements. This segmentation enables efficient resource allocation and prevents traffic from one service from interfering with another, thereby maintaining communication reliability even as network capacity increases to serve more wireless devices.
3Productivity
If VLAN identifiers are assigned to combinations of APNs and Layer 3 addresses, then packet forwarding efficiency is improved, but processing complexity at the wireless access gateway increases
Solution Approach 1:
The patent implements preliminary action by pre-establishing VLAN identifier mappings for APN and Layer 3 address combinations during network setup. The wireless access gateway maintains a mapping table that associates specific APN-L3 address pairs with predetermined VLAN identifiers. When packets arrive, the gateway performs a simple table lookup rather than dynamically calculating VLAN tags, which significantly reduces processing complexity while maintaining high packet forwarding efficiency.
Data Source
AI summary
In general, techniques are described for using virtual local area networks (VLANs) to facilitate packet forwarding between wireless endpoint devices attached to a wireless local area network (WLAN) access network and one or more mobile gateways providing access to packet data network services. For example, a wireless access gateway includes an upstream interface for a mobility tunnel to a mobile gateway of a mobile service provider network and a downstream interface for a WLAN access network. The wireless access gateway receives a packet from the mobile gateway by the upstream interface. The wireless access gateway determines, based at least on the mobility tunnel, a VLAN of the WLAN access network that is uniquely associated in the wireless access gateway with a combination of the APN associated with the mobility tunnel and the mobile gateway. The wireless access gateway then forwards, to a wireless endpoint device, the packet on the VLAN.