Communication method, device and system based on network address translation

Abstract

The invention provides a communication method, device and system based on network address translation. The communication method includes the steps that after an NAT passes through a server to receive a registered message which is sent by a mobile terminal and comprises address information, port identifications and session identifications, the NAT obtains a first mobile terminal and a second mobile terminal with the same session identification and the same port identification, the mapping relation of the session identifications, the port identifications, the address information of the first mobile terminal and the address information of the second mobile terminal is stored, source address information of a communication message which is sent by the first mobile terminal or the second mobile terminal and comprises the session identifications and the port identifications is replaced by the port identifications and IP addresses of the port identifications according to the mapping relation, and the port identifications and the IP addresses of the port identifications are sent to the second mobile terminal or the first mobile terminal. Therefore, the utilization efficiency that the NAT passes through the server is improved, and the requirement of existing communications is met.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of communication, and in particular, to a communication method, device and system based on network address translation. Background technique [0002] With the popularity of the mobile Internet, most mobile terminals have the ability to access the Internet. Due to the depletion of public network IP addresses, the mobile terminal accesses the Internet through its own corresponding Network Address Translation (NAT) device according to the private network IP address assigned by the operator, thus causing the mobile terminal not to It has the ability to address the whole network. Therefore, when mobile terminals A and B are in different private networks, because they cannot obtain the public network IP address of the other party, communication and interaction between A and B cannot be performed through IP, such as: transmitting voice, audio, Multimedia data such as video has certain li...

AI Technical Summary

Problems solved by technology

Due to the depletion of public network IP addresses, the mobile terminal accesses the Internet through its own corresponding Network Address Translation (NAT) device according to the private network IP address assigned by the operator, thus causing the mobile terminal not to Capable of addressing the whole network

Therefore, when mobile terminals A and B are in different private networks, because they cannot obtain the public network IP address of the other party, communication and interaction between A and B cannot be performed through IP, such as: transmitting voice, audio, Multimedia data such as video has certain limitations

[0003] Therefore, in order to solve the above problem, the NAT traversal server assigns the first port in the idle state to mobile terminals A and B for communication interaction between mobile terminals A and B, however, communication interaction between mobile terminals A and B During the process, the port will not be occupied throughout the process, and the utilization rate is very low, which cannot meet the existing communication needs. In the prior art, the NAT traversal server also restores the first port before the communication interaction between mobile terminals A and B ends. Assigned to the remaining pairs of mobile terminals with communication interaction requirements

[0004] However, in the prior art, the first port is assigned to many pairs of different mobile terminals for communication such as mobile terminals A and B, mobile terminals C and D, and for assigning the first port to the same mobile terminal to communicate with other mobile terminals respectively When communicating, such as the communication interaction between mobile terminals A and B, mobile terminals A and D, how the NAT traversal server performs conversion processing, there is an urgent need for a corresponding processing method to further improve the utilization efficiency of the NAT traversal server

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