IPv4 IPv6 Interworking via CSCF Translation Gateway
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Solution Overview
Problem
The transition from IPv4 to IPv6 in wireless networks is hindered by the inability of IPv4 networks to support IPv6 addresses and vice versa, due to differences in address length, leading to costly infrastructure replacements.
Innovation Solution
A network device, such as a dual-stack CSCF, performs interworking by translating between IPv4 and IPv6 addresses, using a back-to-back user agent (B2BUA) functionality to manage IP addresses and sessions, enabling communication across different protocol versions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If networking equipment is upgraded to support IPv6, then IPv6 compatibility is achieved, but infrastructure cost increases significantly
Solution Approach 1:
The patent introduces an IPv4/IPv6 translation gateway as an intermediary device that translates between IPv4 and IPv6 protocols. This gateway acts as a mediator allowing IPv6-capable user equipment to communicate with IPv4-only core network elements, enabling gradual migration without requiring immediate upgrades of all network infrastructure.
Solution Approach 2:
The patent implements preliminary IPv6 support at the user equipment level while maintaining IPv4 infrastructure. User equipment is upgraded to support both IPv4 and IPv6 protocols in advance, allowing them to communicate with existing IPv4 networks through the translation gateway, preparing the network for future IPv6 deployment without immediate full-scale infrastructure replacement.
2Ease of operation
If IPv4 network infrastructure is maintained, then existing equipment compatibility is preserved, but IPv6 communication capability is lost
Solution Approach 1:
The translation gateway is designed with multi-functionality to handle both IPv4 and IPv6 protocols simultaneously. It can translate IPv6 packets from user equipment into IPv4 packets for transmission over the IPv4 core network, and vice versa, making the gateway universally compatible with both protocol versions and enabling seamless communication across protocol boundaries.
3Adaptability or versatility
If protocol translation is implemented, then interoperability between IPv4 and IPv6 is achieved, but device complexity increases
Solution Approach 1:
The patent extracts the complex protocol translation functionality into a separate, dedicated gateway device rather than implementing it within existing core network elements. This extraction isolates the complexity to a single component that can be optimized specifically for translation tasks, while the rest of the core network can remain relatively simple and focused on their primary functions.
Data Source
AI summary
Systems and methods are provided for supporting IPv4-IPv6 interworking of SIP messages in wireless networks and IMS networks. The interworking can be provided to smooth migration to an all-IPv6 IMS network by allowing the use and support of existing legacy IPv4 infrastructure. This functionality may be provided by a call session control function (CSCF) interposed between a user equipment (UE) and an IMS core network with interworking functionality or an interworking module. This device serves as a back-to-back user agent (B2BUA), allocates IP addresses from a pool, performs next-hop route protocol discovery, and maintains and stores information within the gateway as well as interworking and rewriting IP addresses within network messages, while proxying and maintaining sessions between the UE and the IMS core network. This allows for faster call setup, reduced capex/opex, improved debuggability, increased capacity and subscriber density by call processing distribution, and better user experience.