Direct Tunneling Interface Bypasses SGW in LTE Networks
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Solution Overview
Problem
Current LTE protocol-based networks are inefficient due to user packets needing to pass through the Serving Gateway (SGW), leading to increased network latency and reduced end-user data throughput.
Innovation Solution
A direct tunneling interface is introduced between the Radio Access Network and the Packet Data Network Gateway (PDN GW), bypassing the SGW, utilizing the General Packet Radio System (GPRS) Tunneling Protocol (GTP) for improved efficiency and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If user packets pass through the Serving Gateway (SGW) in LTE networks, then network coverage and mobility management are maintained, but network latency increases and data throughput is reduced
Solution Approach 1:
The patent extracts the user plane data forwarding function from the SGW by establishing a direct tunnel between the eNodeB and PDN GW. This removes the SGW as an intermediate node for user data packets, reducing latency and improving throughput while maintaining the SGW's control plane functions for mobility management
Solution Approach 2:
The patent segments the SGW's functions into control plane (retained at SGW) and user plane (bypassed via direct tunnel). This segmentation allows the control functions to remain centralized while enabling direct data paths for improved performance
2Productivity
If a direct tunneling interface is introduced between Radio Access Network and PDN GW, then network efficiency and data throughput are improved, but network architecture complexity increases
Solution Approach 1:
The patent implements multi-functionality in the eNodeB by enabling it to perform both traditional user plane forwarding (via SGW) and direct tunneling to PDN GW. The eNodeB can dynamically select the appropriate path based on service requirements, making the architecture adaptable without requiring complete redesign
Solution Approach 2:
The patent introduces dynamic tunnel establishment and teardown mechanisms that allow the network to adaptively create direct paths when needed and revert to traditional routing when appropriate. This dynamic behavior enables efficiency improvements without permanent architectural complexity
3Loss of time
If user packets bypass the Serving Gateway (SGW), then user packet delay is reduced, but mobility management capability may be compromised
Solution Approach 1:
The patent uses the MME as an intermediary that coordinates between the direct tunnel path and mobility management functions. The MME receives tunnel establishment requests, validates mobility context, and coordinates with the SGW to ensure mobility management continuity even when data packets bypass the SGW
Data Source
AI summary
A system that incorporates the subject disclosure may include, for example, receiving from a wireless device a request for a network connection and facilitating, in response to the request, a communication session between a wireless access node in communication with the wireless device and a packet data network. Control signals are exchanged between a second network device and a packet data network gateway. The second network device includes a mobility anchoring function and operating in an evolved packet core of a long term evolution system. Eligibility of the wireless communication device to participate in a direct tunnel connection is determined, the direct tunnel allowing transfer of user data packets between the wireless device and packet data network to bypass the mobility anchoring function. Establishment of the direct tunnel connection is facilitated to transfer multiple user data packets between the wireless device and the packet data network.