Local Gateway Selection for Home Base Station Tunneling
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Solution Overview
Problem
The prior art is unable to establish a local IP access and tunnel connection between a Home (e)NodeB (HeNB) and a Local Gateway (L-GW) in the newly proposed architectures of the local home base station network, requiring bearer optimization between the base station and the Serving Gateway (S-GW) and between the S-GW and the L-GW.
Innovation Solution
A method is provided to establish a connection between a local gateway and a home base station, where the mobility management network element receives L-GW information from the home base station, selects an L-GW within the same local network, and sends a create session request through the S-GW to establish a PDN connection and bearer tunnel, enabling local IP access for the UE without routing data through the core network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PDN connection is established through the core network using traditional EPS architecture, then reliable data transmission is ensured, but data transmission delay increases and local IP access cannot be achieved
Solution Approach 1:
The patent segments the data transmission path by introducing a local gateway that creates a separate local IP access path parallel to the core network path. This allows LIPA traffic to be routed locally through the home base station and local gateway, while non-LIPA traffic continues through the core network, thereby reducing delay for local traffic without compromising overall reliability
Solution Approach 2:
The local gateway acts as an intermediary between the home base station and the UE, enabling direct local IP access. The gateway establishes a tunnel connection with the home base station and routes LIPA traffic through this local path, mediating between the traditional core network architecture and the new local access requirement
2Productivity
If local IP access is established directly between home base station and local gateway, then data transmission speed improves and delay reduces, but network architecture complexity increases
Solution Approach 1:
The local gateway is designed with multi-functionality, serving both as a router for LIPA traffic and as a node in the existing EPS architecture. It implements both traditional PDN connection functions and new LIPA functions, allowing the same infrastructure to support multiple access types without requiring completely separate systems
Solution Approach 2:
The local IP access architecture is nested within the existing EPS framework. The LIPA PDN connection is embedded as a special case within the broader PDN connection architecture, utilizing existing components like the MME, HSS, and S-GW while adding only the necessary local gateway and tunneling functionality
3Productivity
If bearer optimization is implemented between home base station and serving gateway, then local IP access efficiency improves, but setup procedure complexity increases
Solution Approach 1:
The mobility management network element performs preliminary actions by pre-selecting the local gateway based on UE location and subscription information before the actual LIPA connection is established. This advance preparation simplifies the subsequent connection setup by having the optimal path ready in advance
Solution Approach 2:
The system implements feedback mechanisms where the mobility management network element receives L-GW information from the home base station, selects an appropriate local gateway, and uses this information to optimize subsequent bearer setup procedures. The feedback loop allows the system to learn from previous connections and improve future setup efficiency
Data Source
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Figure 2
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AI summary
The present invention discloses a local network and a method for establishing a connection between a local gateway and a home base station therein. As regards a newly proposed home base station network architecture 1, in embodiments of the present invention, a mobility management network element receives L-GW information sent by the home base station, selects an L-GW which is located in the same local network as the home base station at least according to the received L-GW information and then informs the L-GW, through an S-GW, of establishing a PDN connection and a tunnel bearer with the home base station, thereby providing a local IP access for a UE. As regards a newly proposed home base station network architecture 2, no direct interface is arranged between the L-GW and the S-GW, the mobility management network element directly selects a corresponding L-GW for establishing a PDN connection for the UE, providing a local IP access for the UE. The embodiments of the present invention is capable of establishing a tunnel connection between a home base station and an L-GW for a UE, so that data is routed from the L-GW to the home base station, rather than being transmitted indirectly through the core network of an operator.