PDN Connection Identification via MAC Address in FMC Networks
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Solution Overview
Problem
In Fixed Mobile Convergence (FMC) scenarios, the Evolved Packet Core (EPC) network faces challenges in distinguishing between multiple packet data network connections when they share the same IP address, leading to potential confusion in mapping upstream traffic to the correct GTP/PMIP tunnel, especially when PDNs are served by different operators with overlapping addressing schemes.
Innovation Solution
The method involves using a different MAC address for each packet data network connection to distinguish between them, either at the User Equipment (UE) or the non-3GPP access network gateway, allowing for unique identification and separation of tunnels, even when IP addresses overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple PDN connections share the same IP address in FMC scenarios, then network resource utilization is improved, but the ability to distinguish between connections and map upstream traffic to correct tunnels deteriorates
Solution Approach 1:
The patent introduces a new dimension for identification by using MAC addresses instead of (or in addition to) IP addresses. Each PDN connection is assigned a unique MAC address, creating a new identifier dimension that allows the network to distinguish between connections that share the same IP address, thus resolving the ambiguity in traffic mapping while maintaining IP address reuse for resource efficiency
2Productivity
If IP addresses are reused across different PDN connections, then addressing efficiency is improved, but tunnel mapping accuracy deteriorates
Solution Approach 1:
The patent introduces MAC addresses as an intermediary identifier between the IP address and the GTP/PMIP tunnel. The MAC address serves as a mediator that uniquely identifies each PDN connection, allowing the network to accurately map upstream traffic to the correct tunnel even when multiple connections share the same IP address, thus maintaining both addressing efficiency and tunnel mapping accuracy
3Adaptability or versatility
If multiple radio interfaces are provided in UE for FMC, then connectivity options are improved, but device complexity increases
Solution Approach 1:
The patent makes the MAC address assignment mechanism universal across different radio interfaces and PDN connections. The same MAC address-based identification approach works for both 3GPP and non-3GPP access networks, allowing the UE to manage multiple connectivity options through a unified mechanism without significantly increasing device complexity
Data Source
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AI summary
A method is described of establishing and/or using a plurality of packet data network connections between a user equipment (2) and a 3GPP core network (4) via a gateway node (12) in a non-3GPP access network(6), comprising using a different device identifier for each packet data network connection of the plurality, or at least for each packet data network connection of the plurality that is associated with the same IP address, to distinguish between the packet data network connections of the plurality or to allow such a distinction to be made, wherein the device identifier used to distinguish between the packet data network connections of the plurality is a device identifier associated with the user equipment (2), or a device identifier associated with the gateway node (12) in the non-3GPP access network(6), or a combination of these. The device identifier may be a MAC address.