Performance Enhancing Proxy Handover Mechanism

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Solution Overview

Problem

Current communication systems face challenges in efficiently managing handovers of performance enhancing proxy (PEP) sessions, leading to costly signaling overhead and delays, especially in mobile environments where connections need to be transitioned between different network links.

Innovation Solution

A method and apparatus that detect handovers of PEP sessions and initiate a shutdown procedure to avoid teardown of transport connections, allowing for a 'soft' handover by stopping spoofing without tearing down existing connections, enabling seamless transition between links while maintaining accelerated or unaccelerated TCP sessions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional handover procedure is used to transition connections between network links, then mobility is achieved, but signaling overhead and delay increase significantly

Engineering Contradiction:

ImprovemobilityVSAvoidhandover delay

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by detecting the handover event before the actual link transition occurs and initiating the shutdown procedure in advance. This allows the system to prepare for the handover by stopping spoofing and adjusting TCP parameters before the connection is torn down, thereby reducing the overall handover delay while maintaining mobility

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If traditional handover procedure tears down and reestablishes connections, then link transition is achieved, but signaling overhead increases

Engineering Contradiction:

Improvelink transition capabilityVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent extracts the essential handover function (link transition) from the traditional connection teardown/reestablishment process. By detecting handover events and implementing a simplified shutdown procedure that stops spoofing and adjusts TCP parameters without full connection teardown, the system achieves link transition capability while removing the excessive signaling overhead associated with traditional methods

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If spoofing is stopped during handover, then performance enhancement is maintained, but connection continuity may be affected

Engineering Contradiction:

Improveperformance enhancementVSAvoidconnection continuity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies dynamics by making the spoofing state adjustable rather than static. The system dynamically stops spoofing during handover detection and transitions to non-spoofed mode, then can resume spoofing after handover completion. This dynamic adjustment maintains performance enhancement capability while ensuring connection continuity through controlled state transitions rather than abrupt changes

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS8140687B2Performance enhancing proxy handover

Publication Date: 2012.03.20 HUGHES NETWORK SYST

AI summary

An approach is provided for graceful shutdown and startup of spoofing when a handover procedure is performed. A handover of a performance enhancing proxy (PEP) session associated with a transport connection is detected. A shutdown procedure is initiated to stop spoofing of the transport connection in response to the detected handover. The shutdown procedure avoids teardown of the transport connection during the handover from a first link to a second link of a communication system.