IPv4 IPv6 Address Translation via CGN Compression

The patent employs a Carrier Grade Network Address Translator (CGN) as an intermediary device that sits between IPv4 devices and IPv6 services. The CGN performs protocol translation by receiving IPv4 packets, translating them to IPv6 packets, forwarding them to the destination, and then translating returning IPv6 packets back to IPv4 format. This intermediary approach allows IPv4 devices to access IPv6 services without modifying the devices themselves, thus improving compatibility while centralizing the complexity in the translation device.

The patent implements preliminary collision detection and avoidance mechanisms before address compression is performed. The CGN maintains translation tables that track compressed address mappings and performs collision detection checks before assigning compressed IPv4 addresses to IPv6 addresses. This preliminary action ensures that address collisions are prevented before they can occur, maintaining reliability while enabling communication between different IP versions.

The patent implements partial translation action by maintaining translation state information in the CGN. Once an IPv4-to-IPv6 address mapping is established, the CGN caches the translation in its translation table, allowing subsequent packets to be translated more efficiently without performing full protocol analysis each time. This partial action approach reduces processing overhead while maintaining the ability to translate protocols, thus extending device lifespan without excessive energy consumption.