Method and system for low-orbit satellite communication in space-ground integrated network

Abstract

The embodiment of the invention provides a low orbit satellite communication method and system in a sky-earth integration network. The method comprises the steps that: a first satellite acquires pre-established identifiers of all ground partitions; the first satellite moves to a second ground partition from a first ground partition, and according to the identifiers of all the ground partitions, an address of the first satellite is changed into a second address in the second ground partition, which has a second identifier, from a first address in the first ground partition, which has a first identifier; the first satellite broadcasts a satellite information packet to the second ground partition, so that a first user terminal receiving the satellite information packet keeps a local information table of the first user terminal according to the satellite information packet; and the first satellite acquires a local communication packet sent by the first user terminal according to the local information table of the first user terminal, and establishes a communication connection between the first user terminal and a target terminal according to the local communication packet. According to the method provided by the invention, resource waste of a communication system in the sky-earth integration network is reduced, and communication resources are saved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method and system for low-orbit satellite communication in a space-ground integrated network. Background technique [0002] The concept of MM (Mobile Management, mobility management) was first proposed and used in cellular communication networks. In the wireless mobile network, the network needs to track the mobile user terminals and provide services for them, so that the mobile user terminals can communicate normally, and ensure that the user terminals maintain communication with other user terminals or fixed nodes during the movement process. communication between. In order to ensure that user terminals can stably obtain services from the network at any location within the entire network coverage, the role of MM becomes particularly prominent. [0003] The so-called MM is a time-varying mapping provided between the mobile node's identity (node ​​name) and its address ...

AI Technical Summary

Problems solved by technology

In the existing LEO satellite network, mobile IP technology is widely used, and the movement of a large number of user terminals will cause a large amount of location update information and the time delay caused by the transmission of location update information

And in the satellite communication system, because the satellite is always in a state of high-speed motion, its service coverage area is always changing, so even if the user terminal is in a stationary state relative to the ground, it is also frequently faced with the handover of the satellite

[0007] In the existing mobile IP technology, such as P-MIP (Paging Extensions for Mobile IP, mobile IP paging extension) protocol and Cellular IP (cellular IP) protocol, corresponding extensions have been carried out on the basis of the basic mobile IP protocol. The IP paging function is added, but there are certain problems at the same time. For example, the P-MIP protocol does not support localized paging strategies. With the movement of LEO satellites, users will be farther and farther away from registered satellites, resulting in relatively A long forwarding chain will cause excessive signaling load while causing delay, resulting in a waste of communication system resources

However, Cellular IP does not set up a paging area, which makes the satellite use regular paging to update messages regardless of the size of the area. In the satellite network, a large amount of wireless network resources and energy of user terminals will be consumed, resulting in a waste of communication system resources.

[0008] In short, in the space-ground integrated network, the application of existing mobile IP technology will cause a waste of communication system resources

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