Method, entity and system for implementing network address conversion

Abstract

The inventive embodiment relates to a method for realizing network address conversion in the communication technology field, including: an application function entity receiving a message, and determining signalling direction according to the message; carrying the signalling direction information in access authorization request message, and transmitting to an policy decision function entity based on business; the policy decision function entity based on business, according to the signalling direction, acquiring corresponding local region address and transmitting to the application function entity; the application function entity, according to the local region address, transmitting the message. The inventive embodiment also provides an entity and system for realizing network address conversion. By extending interactive message between the application function entity and the policy decision function entity based on business, the inventive embodiment increases fields representing signaling, so that the policy decision function entity based on business can distinguish upwards and downwards direction of the message (that is, from access side / local terminal kernel side to kernel side / opposite terminal kernel side, or from kernel side / opposite terminal kernel side to access side / local terminal kernel side), thereby realizing NAT control.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method, entity and system for realizing network address translation. Background technique [0002] With the continuous increase of Internet scale, various network services emerge one after another, and advanced multimedia communication systems emerge in endlessly. Since real-time services are sensitive to characteristics such as network transmission delay and delay jitter, when there are high-burst FTP (File Transfer Protocol) or HTTP (Hypertext Transfer Protocol) will be greatly affected; on the other hand, because multimedia services take up a large amount of bandwidth, it is difficult to obtain reliable transmission of key services to be guaranteed by the existing network. Therefore, various QoS (Quality of Service) technologies emerge as the times require. [0003] Carriers and enterprise users have a high degree of awareness of Ethernet technology and end-...

AI Technical Summary

Problems solved by technology

[0009] The embodiment of the present invention provides a method, entity and system for implementing network address translation, which solves the problem that the existing SPDF cannot distinguish the current SDP direction, and thus cannot perform NAT control

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