Session control method and satellite ground station

Abstract

The embodiment of the invention relates to the field of satellite communication, and discloses a session control method and a satellite ground station. In the embodiment of the invention, the sessioncontrol method is applied to a satellite ground station in a satellite communication system, one of a satellite terminal and an IMS is a requester, and the other one is a requested party, the sessioncontrol method comprises the following steps: receiving a first request message sent by the requester, sending a second request message to the requested party according to the first request message, receiving a first response message sent by the requested party, and sending second response information to the requesting party according to the first response message, wherein the satellite ground station is connected with the satellite terminal through a satellite link, and the satellite ground station is connected with the IMS through a ground network and communicates with the IMS based on a preset session control protocol. The embodiment of the invention also provides a satellite ground station. According to the embodiment of the invention, the time delay of satellite communication is greatly reduced.

Description

technical field [0001] The embodiment of the present invention relates to the field of satellite communication, in particular to a session control method and a satellite ground station. Background technique [0002] Session Initiation Protocol (SIP for short) is one of the most widely used protocols in the communication network and the Internet. The two parties in the session can create, modify and end the session through SIP, and can realize voice, video, picture or text through the session. multimedia services. Such as figure 1 As shown, when at least one of the two parties in the conversation is under the satellite network, the conversation message of the conversation through SIP needs to be transmitted through the satellite link, that is, one side of the conversation interacts with the IP Multimedia Subsystem (IP Multimedia Subsystem, IMS for short) through the air interface. However, the inventors found that there are at least the following problems in the prior art: ...

AI Technical Summary

Problems solved by technology

However, the inventors found that there are at least the following problems in the prior art: satellite communication delay is very large, taking the geosynchronous orbit satellite in satellite communication as an example, its one-way delay reaches more than 500 milliseconds, which is 10 times that of ground mobile communication above

Take the process of creating a session through SIP between the two parties in the existing session as an example, as shown in figure 2 As shown in the figure, it can be seen that the session message required to create a session needs to go to and from the satellite 12 times, that is, it only takes 6 seconds to transmit on the satellite link, plus the internal session processing time of the two parties, the two parties create a session It takes more than 10 seconds, and the delay problem is serious

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