Network-Initiated PDP Context Activation for Mobile IP Routing
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Solution Overview
Problem
Current General Packet Radio Service (GPRS) technology lacks a network-initiated mechanism for IP address allocation and local IP point of presence, leading to inefficiencies and increased costs due to suboptimal routing, especially in large geographical areas, and existing mobility solutions like MIPv6 introduce complexity and compatibility issues.
Innovation Solution
The system allows the network to initiate a second PDP context with a new IP address for mobile terminals, enabling smooth handovers and local breakout, with minimal impact on User Equipment and Policy Control and Charging architecture, using network-initiated PDP context activation and operator-configured criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile terminal uses the same IP address to communicate while moving far away from the IP point of presence, then the terminal can maintain connectivity, but routing becomes suboptimal causing increased delays and lower throughput
Solution Approach 1:
The patent applies dynamics by enabling the IP address assignment to be dynamic rather than static. The network can allocate a new IP address from a different IP pool when the terminal's location changes, allowing the IP address to adapt to the terminal's current position and optimize routing paths, thereby resolving the contradiction between maintaining connectivity and achieving optimal data throughput
2Speed
If Mobile IP is used to provide local IP point of presence, then routing optimization is achieved, but the policy enforcement point changes introducing complexity in charging and policy control
Solution Approach 1:
The patent segments the IP address assignment process into different pools: a first IP pool for initial address assignment and a second IP pool for local breakout scenarios. This segmentation allows the network to selectively allocate addresses from appropriate pools without requiring complex Mobile IP protocol implementations, thereby achieving routing optimization while maintaining simple policy control and charging mechanisms
3Speed
If MIPv6 route optimization is used, then routing issues are solved, but more network headers are processed making policy and charging enforcement more complicated
Solution Approach 1:
The patent extracts the mobility management function from the core network and places it in the access network (SGSN/MME). By having the access network handle mobility events and trigger appropriate PDP context activations, the core network is relieved of complex header processing, thereby achieving good routing performance while keeping policy and charging enforcement simple
4Adaptability or versatility
If network-initiated PDP context activation is implemented, then local IP point of presence is provided, but existing GPRS technology lacks the necessary mechanism
Solution Approach 1:
The patent makes the PDP context activation procedure universal by allowing it to be triggered by multiple events: terminal-initiated activation for general packet services, and network-initiated activation for mobility-related local breakout scenarios. This multi-functionality enables a single mechanism to handle both regular and mobility-specific IP address allocation needs, thereby achieving versatility without requiring entirely new technology
Data Source
AI summary
The present invention provides a system, apparatus and method wherein the network initiates a PDP context activation for a second PDP context using a new IP address that can be used for new transport sessions whenever one or more operator configured criteria apply. For example, the present invention can be used to: (1) route ongoing and new communication sessions from the old network device associated with the old IP address through a new network device associated with the new IP address using the old IP address; (2) route ongoing communication sessions from the old network device through the new network device using the old IP address, and new communication sessions directly through the new network device; or (3) route ongoing communication sessions from the old network device through the new network device without using the new IP address, and new communication sessions directly through the new network device.