Virtual Interface Global Address for CDMA Handoff Latency

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Solution Overview

Problem

In cdma2000 networks, mobile nodes experience handoff latency due to link switching delays and lack of global IPv6 addresses, preventing fast binding updates during inter-PDSN handovers, as the previous PDSN's global address becomes invalid when the mobile node moves to a new link.

Innovation Solution

Configuring a virtual interface on the current router with a global address, allowing user equipment to receive this address and facilitate seamless handoffs by using it for fast binding updates, even after the PPP link is terminated.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If a mobile node moves to a new PDSN in cdma2000 networks, then the mobile node can access a new link, but the previous PDSN's global address becomes invalid causing handoff latency

Engineering Contradiction:

Improvehandoff speedVSAvoidhandoff latency

Core Design Contradiction:

SpeedVSLoss of time

Solution Approach 1:

The PDSN performs preliminary actions by configuring a virtual interface and assigning a global address before the mobile node actually hands off. This allows the PDSN to pre-configure forwarding paths and be ready to receive fast binding update messages from the mobile node immediately upon connection, eliminating the delay that would otherwise occur during address configuration and forwarding setup.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A virtual interface is introduced as an intermediary between the PDSN and the mobile node. This virtual interface maintains a persistent global address that remains valid even after the mobile node moves to a new link, allowing continuous communication for fast binding updates without relying on the temporary PPP link address that becomes invalid upon handoff.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the PDSN only configures a link local address on the PPP link, then the configuration is simple, but the mobile node cannot send fast binding updates to the old PDSN

Engineering Contradiction:

Improveconfiguration simplicityVSAvoidhandoff capability

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The virtual interface is designed to serve multiple functions: it maintains a global address for fast binding updates, provides a persistent communication channel beyond the PPP link lifetime, and enables both intra-PDSN and inter-PDSN handoffs. This single virtual interface structure replaces the need for separate mechanisms for different handoff scenarios.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The solution moves from the link-local address space (valid only on the PPP link) to the global address space (valid network-wide). By assigning a global address to the virtual interface, the system transitions from a link-specific addressing dimension to a network-wide addressing dimension, enabling communication across different links and PDSNs.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS8619701B2Method of facilitating handoff for CDMA networks using IP protocols

Publication Date: 2013.12.31 HFI INNOVATION INC

AI summary

A method of configuring routers facilitates handoff of user equipment from a router to another router. The method includes configuring a virtual interface in a current router used by user equipment. The method also includes assigning a global address to the virtual interface. The global address is assigned to the virtual interface that is used to facilitate handoff of the user equipment from a current router to a new router. A system, router and user equipment are configured to implement the method.