WO2023019506A1 - Method and device for end-to-end communication, and system - Google Patents

Abstract

Disclosed in the present invention are a method and device for end-to-end communication. The method comprises: transmitting node information of a satellite-borne UPF at an opposite end to nodes of the satellite-borne UPF by modifying mutually transmitted signaling among all parts forming a ground gateway station, such that satellite-borne UPFs at two ends needing to communicate with each other can transmit service data by means of the satellite-borne UPFs on the basis of the node information of the satellite-borne UPF at the opposite end under the condition of knowing the node information of the satellite-borne UPF at the opposite end, and in this way, direct communication between satellites is realized, and the security of data transmission is further improved.

Description

A method, device and system for end-to-end communication technical field

The invention relates to the field of satellite communication, in particular to a method, device and system for end-to-end communication.

Background technique

As shown in Figure 1, in the satellite network, the access network AN is on the satellite, the core network control plane is deployed on the ground gateway station, and the core network UPF is deployed on the satellite (hereinafter referred to as the satellite-borne UPF) and the ground signal gateway. Off station (hereinafter referred to as ground UPF).

When the satellite terminal communicates, the user data message is forwarded to the ground gateway station through the satellite AN, the inter-satellite link, and the feeder link, and then sent through the ground gateway station, the feeder link, the inter-satellite link, and the satellite AN to the peer satellite terminal. However, when the satellite terminals exchange data through the ground gateway station, there will be a risk of being monitored, and there is a great hidden danger of communication security.

Contents of the invention

In view of this, the embodiment of the present invention discloses a method and device for end-to-end communication, which realizes satellite-to-satellite direct communication and further improves the security of data transmission.

A method for end-to-end communication, the method is applied to a ground gateway station, and the ground gateway station includes: a core network control plane, a ground UPF and a service network, wherein the method includes:

After receiving the first response message, the core network control plane to which the second satellite terminal belongs adds the node information of the second on-board UPF to the first response message, and sends the node information carrying the node information of the second on-board UPF to the first response message. A response message is sent to the service network to which the first satellite terminal belongs; the first response message represents the establishment of the dedicated service flow of the second satellite terminal;

The service network to which the first satellite terminal belongs parses the first response message carrying the node information of the second on-board UPF, obtains the node information of the second on-board UPF to which the second satellite terminal belongs, and passes the The core network control plane to which the first satellite terminal belongs sends the node information of the second on-board UPF to the first on-board UPF;

When the core network control plane to which the first satellite terminal belongs receives the second response message, the core network control plane to which the first satellite terminal belongs adds the node information of the first on-board UPF to the second response message, and carries the second response message. A second response message of the node information of the satellite-borne UPF is sent to the service network to which the second satellite terminal belongs; the second response message represents the case of a dedicated service flow created by the first satellite terminal;

The service network to which the second satellite terminal belongs analyzes the second response message carrying the node information of the first on-board UPF, obtains the node information of the first on-board UPF, and sends the node information of the first on-board UPF to The node information is sent to the second on-board UPF through the core network control plane to which the second satellite terminal belongs; the node information of the first on-board UPF and the node information of the second on-board UPF are the first satellite terminal and the second on-board UPF. The basis for data transmission between satellite terminals through satellites.

Optionally, the sending the node information of the second on-board UPF to the first on-board UPF through the core network control plane to which the first satellite terminal belongs includes:

generating a message to create a dedicated traffic flow request for the first satellite terminal;

Adding the node information of the second on-board UPF to the message of creating the dedicated service flow request of the first satellite terminal;

The service network to which the first satellite terminal belongs sends a message carrying the node information of the second on-board UPF to create a dedicated service flow request for the first satellite terminal to the core network control plane to which the first satellite terminal belongs;

The core network control plane to which the first satellite terminal belongs analyzes the message with the node information of the second on-board UPF to create a dedicated service flow request for the first satellite terminal, and obtains the node information of the second on-board UPF;

Sending the node information of the second on-board UPF to the first on-board UPF.

Optionally, the sending the node information of the first on-board UPF to the second on-board UPF through the core network control plane to which the second satellite terminal belongs includes:

The service network to which the second satellite terminal belongs sends an update message of an update request to the core network control plane to which the second satellite terminal belongs, and adds the node information of the second on-board UPF to the update message;

sending an update message carrying the node information of the second on-board UPF to the core network control plane to which the second satellite terminal belongs;

The control plane of the core network to which the second satellite terminal belongs parses the update message, obtains the node information of the second on-board UPF, and sends the node information of the second on-board UPF to the first on-board UPF.

Optionally, also include:

In response to the first preset condition, the core network to which the first satellite terminal belongs controls and sends a session plane creation request to the first on-board UPF, so that the first on-board UPF is added to the data transmission path of the first satellite terminal;

In response to the second preset condition, the core network to which the second satellite terminal belongs controls to send a session plane establishment request to the second on-board UPF, so that the second on-board UPF joins the data transmission path of the second satellite terminal.

Optionally, the first preset condition is:

A request from the first satellite terminal to access the ground gateway station;

or

Create a dedicated service flow request for the first satellite terminal.

Optionally, the second preset condition is:

A request for the second satellite terminal to access the ground gateway station;

or

Create a dedicated service flow request for the second satellite terminal.

Optionally, if the N6 interface is used between the on-board UPFs, the node information of the first on-board UPF is the address of the N6 interface of the first on-board UPF, and the node information of the second on-board UPF is the address of the second on-board UPF. N6 interface address of UPF;

If the N9 interface is used between the onboard UPFs, the node information of the first onboard UPF is the label information of the second onboard UPF, and the node information of the second onboard UPF is the label information of the second onboard UPF The node information of the first on-board UPF and the node information of the second on-board UPF are the basis for data transmission between the first satellite terminal and the second satellite terminal via the satellite.

Optionally, the service network is an IMS network.

The embodiment of the present invention also discloses a method for end-to-end communication, the method is applied to the spaceborne UPF, and the method includes:

The first on-board UPF receives the node information of the second on-board UPF sent by the core network control plane to which the first satellite terminal belongs; the first on-board UPF is the UPF of the satellite accessed by the first satellite terminal;

The second on-board UPF receives the node information of the first on-board UPF sent by the core network control plane to which the second satellite terminal belongs; the second on-board UPF is the UPF of the satellite accessed by the second satellite terminal;

After any one of the first satellite terminal and the second satellite terminal sends a service message to the corresponding target on-board UPF, the target on-board UPF writes the service message into the opposite end of the on-board UPF node information;

The service message is sent to the space-borne UPF of the opposite end through the node information of the space-borne UPF of the opposite end and the inter-satellite link, and the service message is sent to the satellite terminal of the opposite end through the UPF of the opposite end.

Optionally, sending the service message to the satellite terminal at the opposite end through the UPF at the opposite end includes:

For any on-board UPF:

After receiving the service message, analyze the service message to obtain the node information of the on-board UPF at the opposite end;

If the current on-board UPF is not the node information of the on-board UPF of the opposite end, determine the node information of the next-hop on-board UPF according to the node information of the on-board UPF of the opposite end;

The node information of the on-board UPF that sends the service message to the next hop through the inter-satellite link.

Optionally, after the first on-board UPF or the second on-board UPF receives the service message, it also includes:

Detect the type of the received service message;

If the service message is a voice service, then write the node information of the on-board UPF at the opposite end in the service message, and write the service message through the inter-satellite link and the node information of the on-board UPF at the opposite end Sent to the peer's onboard UPF.

The embodiment of the present invention discloses a device for end-to-end communication. The device is applied to a ground gateway station, and the ground gateway station includes:

Core network control plane, ground UPF and service network;

The devices include:

The first sending unit is configured to add the node information of the second on-board UPF to the first response message after the core network control plane to which the second satellite terminal belongs receives the first response message, and will carry the second on-board UPF node information. The first response message carrying the node information of the UPF is sent to the service network to which the first satellite terminal belongs; the first response message represents the establishment of the dedicated service flow of the second satellite terminal;

The second sending unit is configured to analyze the first response message carrying the node information of the second on-board UPF by the service network to which the first satellite terminal belongs, and obtain the second on-board UPF to which the second satellite terminal belongs and send the node information of the second on-board UPF to the first on-board UPF through the core network control plane to which the first satellite terminal belongs;

The third sending unit is configured to add the node information of the first on-board UPF to the second response message when the core network control plane to which the first satellite terminal belongs receives the second response message. , and send the second response message carrying the node information of the first on-board UPF to the service network to which the second satellite terminal belongs; the second response message is characterized as the case of a dedicated service flow created by the first satellite terminal;

The fourth sending unit is configured to analyze the second response message carrying the node information of the first on-board UPF by the service network to which the second satellite terminal belongs, obtain the node information of the first on-board UPF, and send the The node information of the first on-board UPF is sent to the second on-board UPF through the core network control plane to which the second satellite terminal belongs; the node information of the first on-board UPF and the node information of the second on-board UPF are the The basis for data transmission between the first satellite terminal and the second satellite terminal via satellite.

The embodiment of the present invention discloses a device for end-to-end communication, the device is applied to a spaceborne UPF, and the method includes:

The first receiving unit is used for the first on-board UPF to receive the node information of the second on-board UPF sent by the core network control plane to which the first satellite terminal belongs; the first on-board UPF is accessed by the first satellite terminal The UPF of the satellite;

The second receiving unit is used for the second on-board UPF to receive the node information of the first on-board UPF sent by the control plane of the core network to which the second satellite terminal belongs; the second on-board UPF is accessed by the second satellite terminal The UPF of the satellite;

A service message sending unit, configured to send a service message to the corresponding target on-board UPF after any one of the first satellite terminal and the second satellite terminal sends a service message, the target on-board UPF Write the node information of the on-board UPF of the opposite end in ;

A data transmission unit, configured to send the service message to the peer UPF through the node information and the inter-satellite link of the peer UPF, and send the service message to the peer satellite through the peer UPF terminal.

The embodiment of the present invention discloses a communication system, which includes:

Ground gateway station and spaceborne UPF;

The ground gateway station is used to execute the above-mentioned end-to-end communication method applied to the ground gateway station;

The on-board UPF is used to execute the above-mentioned end-to-end communication method applied to the on-board UPF.

The embodiment of the present invention discloses a method and device for end-to-end communication. The control plane of the core network to which the second satellite terminal belongs will carry the second The first response message of the node information of the spaceborne UPF is sent to the service network to which the first satellite terminal belongs, and then the node information of the second spaceborne UPF is sent to the first spaceborne UPF through the control plane of the core network to which the first satellite terminal belongs The core network control plane to which the first satellite terminal belongs sends the second response message carrying the node information of the first on-board UPF to the second satellite terminal by adding the node information of the first on-board UPF in the first response message The service network to which the second satellite terminal belongs further sends the node information of the first on-board UPF to the second on-board UPF through the control plane of the core network to which the second satellite terminal belongs. Therefore, the on-board UPFs at both ends of the communication need to know the node information of the peer on-board UPF, and can transmit business data through the on-board UPF based on the node information of the peer on-board UPF, thus realizing Satellite-to-satellite direct communication further enhances the security of data transmission.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 shows a schematic diagram of a satellite network in the prior art;

FIG. 2 shows a schematic diagram of an interaction of end-to-end communication provided by an embodiment of the present invention;

Fig. 3 shows a schematic diagram of another interaction of end-to-end communication provided by an embodiment of the present invention;

FIG. 4 shows a schematic flowchart of a method for end-to-end communication provided by an embodiment of the present invention;

FIG. 5 shows another schematic flowchart of a method for end-to-end communication provided by an embodiment of the present invention;

FIG. 6 shows a schematic structural diagram of a device for end-to-end communication provided by an embodiment of the present invention;

Fig. 7 shows a schematic structural diagram of an end-to-end communication device disclosed in an embodiment of the present invention;

Fig. 8 shows a schematic structural diagram of a communication system provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The following is an explanation of the English abbreviations that appear in this embodiment:

Acronym	English full name	Chinese full name
AN	Access Network	Access Network
IMS	IP Multimedia Subsystem	IP multimedia system
VoNR	Voice/Video over New Radio	Voice/Video over New Wireless
UE	User Equipment	user equipment
SMF	Session Management Function	session management function
UPF	User Plane Function	User Plane Functions
MPLS	Multi-Protocol Label Switching	MPLS

Example 1

Referring to FIG. 2 and FIG. 3 , it shows a schematic diagram of interaction of end-to-end communication provided by an embodiment of the present invention. The method is applied to a communication system, and the communication system includes:

Satellite terminal, spaceborne UPF and ground gateway station, where the ground gateway station includes: core network control plane, ground UPF and service network;

S201: The first satellite terminal sends a session establishment request to the ground gateway, so that the first satellite terminal accesses the ground gateway;

In this embodiment, the first satellite terminal sends a session creation request to the core network control panel to which the first satellite terminal belongs through the spaceborne AN to which the first satellite terminal belongs, and the core network control plane notifies the ground UPF to create a user session plane context. User data packets can be sent to the service network via the spaceborne AN and the ground UPF.

Wherein, the service network may be an IMS network or a data network.

S202: The second satellite terminal sends a session creation request to the ground gateway, so that the second satellite terminal accesses the ground gateway;

In this embodiment, the second satellite terminal sends a session creation request to the core network control panel to which the second satellite terminal belongs through the spaceborne AN to which the second satellite terminal belongs, and the core network control plane notifies the ground UPF to create a user session plane context. User data packets can be sent to the service network via the spaceborne AN and the ground UPF.

Wherein, the service network may be an IMS network or a data network.

S203: The ground gateway station sends a session plane establishment request to the first on-board UPF, so that the first on-board UPF is added to the data transmission path of the first satellite terminal;

Wherein, the trigger condition for the ground gateway station to send the session plane creation request to the first on-board UPF may include various types, and preferably may include the following two situations:

First trigger condition:

The ground gateway station receives the session establishment request of the first satellite terminal;

Second trigger condition:

The core network control plane to which the first satellite terminal belongs receives the request for creating a dedicated service flow sent by the service network.

Specifically, the core network to which the first satellite terminal belongs controls and sends a session plane establishment request to the first on-board UPF, so that the first on-board UPF is added to the data transmission path of the first satellite terminal.

Then, after adding the first on-board UPF to the data transmission path of the first satellite terminal, the first satellite terminal transmits to the service via the first on-board AN, the first on-board UPF, and the ground UPF to which the first satellite terminal belongs. network.

S204: The ground gateway station sends a session plane creation request to the second on-board UPF, so that the second on-board UPF is added to the data transmission path of the second satellite terminal;

In this embodiment, the trigger conditions for the ground gateway station to send the session plane creation request to the first on-board UPF may include various types, preferably including the following two situations:

First trigger condition:

The ground gateway station receives the session establishment request of the second satellite terminal;

Second trigger condition:

The control plane of the core network to which the second satellite terminal belongs receives the request for creating a dedicated service flow sent by the service network.

Specifically, the core network to which the second satellite terminal belongs controls and sends a session plane creation request to the second on-board UPF, so that the second on-board UPF is added to the data transmission path of the second satellite terminal.

Then, after adding the second on-board UPF to the data transmission path of the second satellite terminal, the second satellite terminal transmits to the service via the second on-board AN, the second on-board UPF, and the ground UPF to which the second satellite terminal belongs. network.

S205: After receiving the call request sent by the first satellite terminal, the ground UPF to which the first satellite terminal belongs sends the call request to the service network to which the second satellite terminal belongs, and transmits the call request through the service network to which the second satellite terminal belongs send to the second satellite terminal;

The first satellite terminal sends a call request to the second satellite terminal, and the call message is transmitted to the service network to which the first satellite terminal belongs via the first on-board AN and the ground UPF to which the first satellite terminal belongs. After being exchanged by the service network, the service network The call request is transmitted to the second satellite terminal through the ground UPF to which the second terminal belongs and the second spaceborne AN.

Wherein, when the call request reaches the service network to which the second satellite belongs, if the first satellite terminal and the second satellite terminal belong to different service networks, through the ground UPF to which the first satellite terminal belongs, the core network to which the first satellite terminal belongs The network control plane sends the call request to the service network to which the first satellite terminal belongs, and the service network to which the first satellite terminal belongs sends the call request to the service network to which the second satellite terminal belongs.

If the first satellite terminal and the second satellite terminal belong to the same service network, the core network control plane sends the call request to the service network via the ground UPF after receiving the call request.

After receiving the call request, the service network to which the second satellite terminal belongs sends the call request to the spaceborne AN to which the second satellite terminal belongs through the ground UPF to which the second satellite terminal belongs, and then sends it to the second satellite terminal.

S206: The second satellite terminal sends a call response to the ground UPF to which the second satellite terminal belongs, and sends the call response to the service network to which the first satellite terminal belongs through the ground UPF to which the second satellite terminal belongs;

In this embodiment, if the ground gateway stations to which the first satellite terminal and the second satellite terminal belong are different, then the first satellite terminal sends a call response to the ground UPF to which the second satellite terminal belongs, and the ground UPF to which the second satellite terminal belongs sends a call response to the service network to which the second satellite belongs, and to send to the service network to which the first satellite terminal belongs via the service network to which the second satellite belongs.

If the ground gateways to which the first satellite terminal and the second satellite terminal belong are the same, the second satellite terminal sends a call response to the ground UPF, and sends the call response to the service network.

S207: The service network to which the second satellite terminal belongs triggers the core network control plane to which the second satellite terminal belongs to create a dedicated service flow for the second satellite terminal;

The service network to which the second satellite terminal belongs sends a request for creating a dedicated service flow to the core network control plane to which the second satellite terminal belongs, and the core network control plane to which the second satellite terminal belongs notifies the satellite-borne AN second Satellite terminals create dedicated traffic streams.

S208: After the dedicated service flow of the second satellite terminal is created, the second satellite terminal and the on-board AN to which the second satellite terminal belongs send a first response message to the core network control plane to which the second satellite terminal belongs; the first response Messages are used to indicate the creation of dedicated service flows;

S209: The core network control plane to which the second satellite terminal belongs adds the node information of the second on-board UPF to the first response message, and sends the first response message carrying the node information of the second on-board UPF, sending to the service network to which the first satellite terminal belongs;

After receiving the first response message, the core network control plane to which the second satellite terminal belongs adds the node information of the second on-board UPF to the first response message, and sends the node information carrying the node information of the second on-board UPF to the first response message. A response message is sent to the service network to which the first satellite terminal belongs.

Wherein, if the first satellite terminal and the second satellite terminal belong to different ground gateway stations, the core network control plane to which the second satellite terminal belongs will carry the node information of the second on-board UPF through the ground UPF to which the second satellite belongs The first response message is sent to the service network to which the second satellite terminal belongs, and is sent to the service network to which the first satellite terminal belongs via the service network to which the second satellite terminal belongs.

If the first satellite terminal and the second satellite terminal belong to the same ground gateway station, the control plane of the core network to which the second satellite terminal belongs sends to the corresponding service network via the corresponding ground UPF.

S210: The service network to which the first satellite terminal belongs triggers the core network control plane to which the first satellite terminal belongs to create a dedicated service flow for the first satellite terminal;

After receiving the request for creating a dedicated service flow, the control plane of the core network to which the first satellite terminal belongs notifies the first satellite terminal and the spaceborne AN to which the first satellite terminal belongs to create a dedicated service flow.

S211: The core network to which the first satellite terminal belongs controls and sends node information of the second on-board UPF to the first on-board UPF;

Wherein, the core network control plane to which the second satellite terminal belongs not only sends the node information of the second on-board UPF to the first on-board UPF, but also sends forwarding rules to the first on-board UPF.

S212: After the dedicated service flow of the first satellite terminal is created, the on-board AN to which the first satellite terminal and the second satellite terminal belong sends a second response message to the core network control plane to which the first satellite terminal belongs;

Wherein, the second response message represents the establishment of the dedicated service flow of the first satellite terminal by the first satellite terminal and the on-board AN to which the first satellite terminal belongs.

S213: The core network control plane to which the first satellite terminal belongs adds the node information of the first on-board UPF to the second response message, and sends the second response message carrying the node information of the first on-board UPF to the second satellite terminal the business network to which it belongs;

After receiving the second response message, the core network control plane to which the first satellite terminal belongs adds the node information of the first on-board UPF to the second response message, and sends the node information carrying the node information of the first on-board UPF to the second response message. The second response message is sent to the service network to which the second satellite terminal belongs.

Wherein, if the first satellite terminal and the second satellite terminal belong to different ground gateway stations, the core network control plane to which the first satellite terminal belongs will carry the node information of the first on-board UPF through the ground UPF to which the first satellite belongs The second response message is sent to the service network to which the first satellite terminal belongs, and is sent to the service network to which the second satellite terminal belongs via the service network to which the first satellite terminal belongs.

If the first satellite terminal and the second satellite terminal belong to the same ground gateway station, the core network control plane to which the first satellite terminal belongs sends to the corresponding service network via the corresponding ground UPF.

S214: The service network to which the second satellite terminal belongs sends the node information of the first on-board UPF to the core network control plane to which the second satellite terminal belongs, and the core network control plane to which the second satellite terminal belongs sends the node information of the first on-board UPF The information is sent to the second onboard UPF.

S215: After any one of the first satellite terminal or the second satellite terminal sends a service message to the corresponding on-board UPF, the on-board UPF writes the node information of the opposite end of the on-board UPF into the service message to pass The node information of the on-board UPF at the opposite end and the inter-satellite link send service packets to the on-board UPF at the opposite end. Among them, satellites are connected through inter-satellite links, and MPLS is used for communication.

In this embodiment, if the first satellite terminal sends a service message to the first on-board UPF, the first on-board UPF writes the node information of the second on-board UPF in the service message, and then passes the second on-board UPF The node information of the on-board UPF and the node information on which the inter-satellite link sends the service message to the second on-board UPF through the transmission between the on-board UPFs.

If the second satellite terminal sends a service message to the first on-board UPF, the on-board UPF to which the second satellite terminal belongs writes the node information of the first on-board UPF in the service message, and then passes the first on-board UPF The node information of the UPF and the inter-satellite link send the service message to the node information of the first on-board UPF through the transmission between the on-board UPFs.

In this embodiment, the core network control plane to which the second satellite terminal belongs sends the first response message carrying the node information of the second on-board UPF to the first response message by adding the node information of the second on-board UPF to the response message. The service network to which a satellite terminal belongs sends the node information of the second on-board UPF to the first on-board UPF through the core network control plane to which the first satellite terminal belongs; The node information of the first on-board UPF is added to the response message, and the second response message carrying the node information of the first on-board UPF is sent to the service network to which the second satellite terminal belongs, and then through the core network to which the second satellite terminal belongs. The network control plane sends the node information of the first on-board UPF to the second on-board UPF. Therefore, the on-board UPFs at both ends of the communication need to know the node information of the peer on-board UPF, and can transmit business data through the on-board UPF based on the node information of the peer on-board UPF, thus realizing Satellite-to-satellite direct communication further enhances the security of data transmission.

Wherein, above-mentioned embodiment 1 comprises two kinds of implementation modes:

Embodiment 1: After receiving the session creation request from the first satellite terminal, the ground gateway station sends a session creation request to the first on-board UPF, so that the first on-board UPF is added to the data transmission path of the first satellite terminal , then the first satellite terminal transmits to the service network via the first spaceborne AN, the first spaceborne UPF, and the ground UPF to which the first satellite terminal belongs.

After receiving the session creation request from the second satellite terminal, the ground gateway station sends a session creation request to the second on-board UPF, so that the second on-board UPF joins the data transmission path of the second satellite terminal. The two satellite terminals transmit to the service network through the second spaceborne AN, the second spaceborne UPF, and the ground UPF to which the second satellite terminal belongs.

Implementation mode two,

After receiving the request for creating a dedicated service flow sent by the service network, the control plane of the core network to which the first satellite terminal belongs sends a session plane creation request to the first on-board UPF, so that the first on-board UPF adds the data of the first satellite terminal On the transmission path, at this time, the first satellite terminal transmits to the service network via the first spaceborne AN, the first spaceborne UPF, and the ground UPF to which the first satellite terminal belongs.

After receiving the request for creating a dedicated service flow sent by the service network, the control plane of the core network to which the second satellite terminal belongs sends a session plane creation request to the second on-board UPF, so that the second on-board UPF joins the data of the second satellite terminal On the transmission path, at this time, the second satellite terminal transmits to the service network via the second spaceborne AN, the second spaceborne UPF, and the ground UPF to which the second satellite terminal belongs.

Based on the above two different implementations, the paths of data transmission are slightly different. In order to reflect the above two paths more clearly, refer to Figure 2 and Figure 3, which respectively show the implementation methods of Embodiment 1 and Embodiment 2. In order to be more clear To explain the two situations, the specific ways of Fig. 6 and Fig. 7 are introduced as follows:

For Embodiment 1 (Figure 2)

[001-008] The calling UE session creation process. The 5GC control plane notifies the ground UPF and the spaceborne UPF1 to create a user plane session context. At this time, the user data message is transmitted to the data network or IMS domain through the spaceborne AN1, spaceborne UPF1, and ground UPF.

[009-016] The called UE session creation process. The 5GC control plane notifies the ground UPF and the spaceborne UPF2 to create a user plane session context. At this time, the user data message is transmitted to the data network or IMS domain through the spaceborne AN2, the spaceborne UPF2, and the ground UPF.

[017-018] The calling UE sends a call request to the called UE, and the data message is transmitted to the IMS domain via the on-board AN1, on-board UPF1, and ground UPF. The on-board AN2 and on-board UPF2 are transmitted to the called UE.

[019-020] The called UE sends a call response to the calling UE, and the data message is transmitted to the IMS domain via the on-board AN2, the on-board UPF2, and the ground UPF. The on-board UPF1 and on-board AN1 are transmitted to the calling UE.

[021] The IMS notifies the 5GC control plane to create a voice-dedicated service flow for the called UE.

[022-027] The IMS notifies the 5GC control plane to create a voice-dedicated service flow for the called UE.

[028] The 5GC controls to send a service flow creation response to the IMS domain, and the message carries the endpoint information of the on-board UPF2. If in the end-to-end business, the N6 interface is used between the space-borne UPFs, the UPF2 N6 interface address information is carried; if the N9 interface is used between the space-borne UPFs in the end-to-end business, the UPF2 N9 interface TEIDU and the corresponding satellite are carried Label Information.

[029] The IMS notifies the 5GC control plane to create a dedicated voice service flow for the calling UE, and the message carries the onboard UPF2 endpoint information. If the calling and called IMSs are different, the called side IMS needs to send the on-board UPF2 endpoint information to the calling side IMS.

[030-035] The 5GC control plane notifies AN1 and the calling UE to create a dedicated service flow. 5GC synchronously provides UPF2 endpoint information and forwarding rules to UPF1. At this time, the IMS user data of the calling UE is transmitted to UPF2 via AN1 and UPF1 onboard, and other user data is transmitted to UPF2 via AN1 and UPF1 onboard. , The ground UPF is transmitted to the data network or IMS domain.

[036] The 5GC control sends a service flow response towards the IMS domain, and the message carries the endpoint information of the on-board UPF1. If in the end-to-end business, the N6 interface is used between the space-borne UPFs, it will carry the address information of the UPF1 N6 interface; if in the end-to-end business, the N9 interface is used between the space-borne UPFs, it will carry the UPF1 N9 interface TEIDU and the corresponding satellite Label Information.

[037-040] The IMS initiates an update request to provide the onboard UPF1 endpoint information to the 5GC control plane. If the calling and called IMSs are different, the calling side IMS needs to send the on-board UPF1 endpoint information to the called side IMS. The 5GC control plane provides the onboard UPF1 endpoint information and forwarding rules to UPF2. At this time, the IMS user data of the called UE is transmitted to the onboard UPF1 through the onboard AN2 and the onboard UPF2. UPF2, ground UPF transmission to the data network or IMS domain.

[041-044] The calling UE initiates an update request and notifies the called UE of the update status.

[045] The user IMS data message starts to be transmitted. At this time, the user IMS data message is directly transmitted through the spaceborne UPF of the calling party and the called party, and is no longer exchanged through the ground IMS domain.

For the second embodiment (Figure 3)

[001-004] The calling UE session creation process. The 5GC control plane notifies the ground UPF to create a user plane session context. At this time, the user data message is transmitted to the data network or IMS domain via the onboard AN1 and the ground UPF.

[005-008] The called UE session creation process. The 5GC control plane notifies the ground UPF to create a user plane session context, at this time, the user data message is transmitted to the data network or IMS domain via the onboard AN2 and the ground UPF.

[009-010] The calling UE sends a call request to the called UE, and the data message is transmitted to the IMS domain via the spaceborne AN1 and the ground UPF. After the IMS domain exchange, the IMS domain transmits the call request via the ground UPF and the spaceborne AN2 to the called UE.

[011-012] The called UE sends a call response to the calling UE, and the data message is transmitted to the IMS domain via the spaceborne AN2 and the ground UPF. After the IMS domain exchange, the IMS domain transmits the call request via the ground UPF and the spaceborne AN1 to the calling UE.

[013] The IMS notifies the 5GC control plane to create a voice-dedicated service flow for the called UE.

[014-019] The 5GC control plane adds the onboard UPF2 to the data path of the called UE. At this time, the user data of the called UE is transmitted to the data network or IMS domain through the onboard AN2, the onboard UPF2, and the ground UPF.

[020-025] The 5GC control plane notifies AN2 and the called UE to create a dedicated service flow.

[026] The 5GC controls to send a service flow creation response to the IMS domain, and the message carries the endpoint information of the onboard UPF2. If in the end-to-end business, the N6 interface is used between the space-borne UPFs, the UPF2 N6 interface address information is carried; if the N9 interface is used between the space-borne UPFs in the end-to-end business, the UPF2 N9 interface TEIDU and the corresponding satellite are carried Label Information.

[027] The IMS notifies the 5GC control plane to create a dedicated voice service flow for the calling UE, and the message carries the on-board UPF2 endpoint information. If the calling and called IMSs are different, the called side IMS needs to send the on-board UPF2 endpoint information to the calling side IMS.

[028-033] The 5GC control plane adds the onboard UPF1 to the data path of the calling UE, and at the same time provides the endpoint information and forwarding rules of the onboard UPF2 to UPF1. At this time, the IMS user data of the calling UE passes through the onboard AN1 and the onboard UPF1 , transmitted to the spaceborne UPF2, and other user data are transmitted to the data network or IMS domain through the spaceborne AN1, spaceborne UPF1, and ground UPF.

[034-039] The 5GC control plane notifies AN1 and the calling UE to create a dedicated service flow.

[040] The 5GC controls to send a create service flow response to the IMS domain, and the message carries the endpoint information of the onboard UPF1. If in the end-to-end business, the N6 interface is used between the space-borne UPFs, it will carry the address information of the UPF1 N6 interface; if in the end-to-end business, the N9 interface is used between the space-borne UPFs, it will carry the UPF1 N9 interface TEIDU and the corresponding satellite Label Information.

[041-044] The IMS initiates an update request, and provides the onboard UPF1 endpoint information to the 5GC control plane. If the calling and called IMSs are different, the calling side IMS needs to send the on-board UPF1 endpoint information to the called side IMS. The 5GC control plane provides the onboard UPF1 endpoint information and forwarding rules to UPF2. At this time, the IMS user data of the called UE is transmitted to the onboard UPF1 through the onboard AN2 and the onboard UPF2. UPF2, ground UPF transmission to the data network or IMS domain.

[045-048] The calling UE initiates an update request and notifies the called UE of the update status.

[049] The user IMS data packet starts to be transmitted. At this time, the user IMS data message is directly transmitted through the spaceborne UPF of the calling party and the called party, and is no longer exchanged through the ground IMS domain.

Example 2

Referring to FIG. 4 , it shows a schematic flowchart of a method for end-to-end communication provided by an embodiment of the present invention. The method is applied to a ground gateway station. In this embodiment, the method includes:

S301: After receiving the first response message, the core network control plane to which the second satellite terminal belongs adds the node information of the second on-board UPF to the first response message, and carries the node information of the second on-board UPF The first response message is sent to the service network to which the first satellite terminal belongs; the first response message represents the establishment of the dedicated service flow of the second satellite terminal;

In this embodiment, the service network to which the second satellite terminal belongs triggers the control plane of the core network to which the second satellite belongs to create a dedicated service flow for the second satellite terminal, wherein, after the first satellite terminal initiates a call request to the second satellite terminal, The second satellite terminal sends a call response to the first satellite terminal. After the second satellite terminal feeds back the call response, the service network to which the second satellite terminal belongs triggers the control plane of the core network to which the second satellite terminal belongs to create a call response for the second satellite terminal. Dedicated business flow. The core network control plane to which the second satellite terminal belongs notifies the second on-board AN and the second satellite terminal to create a dedicated service flow, and the second on-board AN and the second satellite terminal feed back a first response message, which represents the second Creation of dedicated traffic streams for satellite terminals.

Wherein, when the control plane of the core network to which the second satellite terminal belongs receives the first response message, in order for the opposite end to obtain the node information of the second on-board UPF, the signaling of the first response message is modified, and the first response message The node information of the second satellite-borne UPF is added in, and the node information is transmitted to the service network to which the first satellite terminal belongs.

Wherein, if the first satellite terminal and the second satellite terminal belong to different ground gateway stations, the core network control plane to which the second satellite terminal belongs needs to be forwarded to the service network to which the first satellite terminal belongs via the service network to which the second satellite terminal belongs. network.

S302: The service network to which the first satellite terminal belongs parses the first response message carrying the node information of the second on-board UPF, obtains the node information of the second on-board UPF to which the second satellite terminal belongs, and sending the node information of the second on-board UPF to the first on-board UPF through the core network control plane of the first satellite terminal;

The service network to which the first satellite terminal belongs analyzes the first response message carrying the node information of the second on-board UPF, obtains the node information of the second on-board UPF, and sends the node information of the second on-board UPF through the first The core network control plane to which the satellite terminal belongs sends to the first on-board UPF.

Specifically, the service network described by the first satellite terminal sends a message of creating a dedicated service flow request to the core network control plane to which the first satellite terminal belongs, and the message carries the node information of the second on-board UPF, specifically, including :

generating a message to create a dedicated traffic flow request for the first satellite terminal;

Adding the node information of the second on-board UPF to the message of creating the dedicated service flow request of the first satellite terminal;

Sending a message carrying the node information of the second satellite-borne UPF to create a dedicated service flow request for the first satellite terminal to the core network control plane to which the first satellite terminal belongs;

The core network control plane to which the first satellite terminal belongs analyzes the message with the node information of the second on-board UPF to create a dedicated service flow request for the first satellite terminal, and obtains the node information of the second on-board UPF;

Sending the node information of the second on-board UPF to the first on-board UPF.

S303: When the core network control plane to which the first satellite terminal belongs receives the second response message, the core network control plane to which the first satellite terminal belongs adds the node information of the first on-board UPF to the second response message, and carries The second response message with the node information of the first on-board UPF is sent to the service network to which the second satellite terminal belongs; the second response message represents the case of a dedicated service flow created by the first satellite terminal.

The control plane of the core network to which the first satellite terminal belongs notifies the first satellite terminal and the first onboard AN to create a dedicated service flow after receiving the message of creating a dedicated service flow request sent by the service network to which the first satellite terminal belongs. And, the node information of the second on-board UPF is sent to the first on-board UPF.

The first satellite terminal and the first on-board AN feed back a second response message to the core network control plane to which the first satellite terminal belongs, where the second response message represents a situation of a dedicated service flow created by the first satellite terminal.

The core network control plane of the first satellite terminal adds the node information of the first on-board UPF to the second response message, and sends the second response message carrying the node information of the first on-board UPF to the second response message to which the second satellite terminal belongs. business network.

S304: The service network to which the second satellite terminal belongs analyzes the second response message carrying the node information of the first on-board UPF, obtains the node information of the first on-board UPF, and sends the first on-board UPF The node information of the UPF is sent to the second on-board UPF through the control plane of the core network to which the second satellite terminal belongs; the node information of the first on-board UPF and the node information of the second on-board UPF are the first satellite terminal and the node information of the second on-board UPF. The basis for the second satellite terminal to transmit data between satellites.

In this embodiment, after receiving the second response message carrying the node information of the first on-board UPF, the service network to which the second on-board UPF belongs parses the second response message to obtain the node information of the first on-board UPF, and Send an update request to the core network control plane to which the second satellite terminal belongs, and update the node information of the first on-board UPF to the second on-board UPF. Specifically, S304 includes:

The service network to which the second satellite terminal belongs sends an update message of an update request to the core network control plane to which the second satellite terminal belongs, and adds the node information of the second on-board UPF to the update message;

Send the update message carrying the node information of the second satellite-borne UPF to the core network control plane to which the second satellite terminal belongs;

The control plane of the core network to which the second satellite terminal belongs parses the update message, obtains the node information of the second on-board UPF, and sends the node information of the second on-board UPF to the first on-board UPF.

Further, in order to ensure direct communication between satellites, it is also necessary to add the first on-board UPF to the data transmission path of the first satellite terminal, and add the second on-board UPF to the transmission path of the second satellite terminal, Specifically, it also includes:

In response to the first preset condition, the core network to which the first satellite terminal belongs controls and sends a session plane creation request to the first on-board UPF, so that the first on-board UPF is added to the data transmission path of the first satellite terminal;

In response to the second preset condition, the core network to which the second satellite terminal belongs controls to send a session plane establishment request to the second on-board UPF, so that the second on-board UPF joins the data transmission path of the second satellite terminal.

Wherein, the first preset condition is:

A request from the first satellite terminal to access the ground gateway station;

or

Create a dedicated service flow request for the first satellite terminal.

The second preset condition is:

A request for the second satellite terminal to access the ground gateway station;

or

Create a dedicated service flow request for the second satellite terminal.

That is to say, when the satellite terminal accesses the ground gateway, or before creating a dedicated service flow, the on-board UPF to which the satellite terminal belongs can be added to the data transmission path of the satellite terminal.

In this embodiment, if the N6 interface is used between the on-board UPFs, the node information of the first on-board UPF is the address of the N6 interface of the first on-board UPF, and the node information of the second on-board UPF is the address of the second N6 interface address of onboard UPF;

If the N9 interface is used between the onboard UPFs, the node information of the first onboard UPF is the label information of the second onboard UPF, and the node information of the second onboard UPF is the label information of the second onboard UPF The node information of the first on-board UPF and the node information of the second on-board UPF are the basis for data transmission between the first satellite terminal and the second satellite terminal via the satellite.

In this embodiment, the core network control plane to which the second satellite terminal belongs sends the first response message carrying the node information of the second on-board UPF to the first response message by adding the node information of the second on-board UPF to the response message. The service network to which a satellite terminal belongs sends the node information of the second on-board UPF to the first on-board UPF through the core network control plane to which the first satellite terminal belongs; The node information of the first on-board UPF is added to the response message, and the second response message carrying the node information of the first on-board UPF is sent to the service network to which the second satellite terminal belongs, and then through the core network to which the second satellite terminal belongs. The network control plane sends the node information of the first on-board UPF to the second on-board UPF. Therefore, the on-board UPFs at both ends of the communication need to know the node information of the peer on-board UPF, and can transmit business data through the on-board UPF based on the node information of the peer on-board UPF, thus realizing Satellite-to-satellite direct communication further enhances the security of data transmission.

Among them, the various parts that constitute the ground gateway station send the node information of the on-board UPF to the node of the on-board UPF by modifying the signaling transmitted to each other, and realize the transmission of the node information of the on-board UPF. It provides a guarantee for the realization of satellite-to-satellite direct communication.

Further, in order to avoid occupying more resources in the satellite, in one embodiment, only the voice calls with high confidentiality can be directly communicated between the satellite and the satellite, then the above-mentioned embodiment 1 and embodiment 2 The service network is an IMS network.

Example 3

Referring to FIG. 5 , it shows another schematic flowchart of a method for end-to-end communication provided by an embodiment of the present invention. In this embodiment, the method includes:

S401: The first on-board UPF receives and saves the node information of the second on-board UPF sent by the core network control plane to which the first satellite terminal belongs; the first on-board UPF is the node information of the satellite accessed by the first satellite terminal UPF;

It can be seen from the above-mentioned embodiment 1 and embodiment 2 that after obtaining the node information of the second on-board UPF, the core network control plane to which the first satellite terminal belongs sends the node information of the first on-board UPF to the first on-board UPF UPF, the specific transmission process has been introduced in detail in Embodiment 1 and Embodiment 2 above, and will not be repeated in this embodiment.

The first on-board UPF receives the node information of the second on-board UPF, and stores the node information of the second on-board UPF.

S402: The second on-board UPF receives and saves the node information of the first on-board UPF sent by the control plane of the core network to which the second satellite terminal belongs; the second on-board UPF is the node information of the satellite accessed by the second satellite terminal UPF;

It can be seen from the above-mentioned embodiment 1 and embodiment 2 that after obtaining the node information of the first on-board UPF, the control plane of the core network to which the second satellite terminal belongs sends the node information of the first on-board UPF to the second on-board UPF UPF, the specific transmission process has been introduced in detail in Embodiment 1 and Embodiment 2 above, and will not be repeated in this embodiment.

The second onboard UPF receives the node information of the first onboard UPF, and stores the node information of the first onboard UPF.

S403: After any one of the first satellite terminal and the second satellite terminal sends a service message to the corresponding target on-board UPF, the target on-board UPF writes the service message into the satellite terminal of the opposite end. Load the node information of UPF;

Wherein, after the first satellite terminal and the second satellite terminal establish a communication connection, the first satellite terminal and the second satellite terminal can perform data transmission with each other.

In this embodiment, after the first on-board UPF and the second on-board UPF establish a session connection, the first on-board UPF is the opposite end of the second on-board UPF, and the second on-board UPF is the peer of the first on-board UPF. Peer.

S404: Send the service message to the spaceborne UPF of the opposite end through the node information of the spaceborne UPF of the opposite end and the inter-satellite link, and send the service message to the satellite terminal of the opposite end through the UPF of the opposite end.

Among them, when the service message is communicated between satellites, the transmission route between satellites can be determined through the node information of the on-board UPF at the opposite end written in the message, so as to transmit the message through the inter-satellite link.

Preferably, the process of transmitting service messages between satellites includes:

For any on-board UPF:

After receiving the service message, analyze the service message to obtain the node information of the on-board UPF at the opposite end;

If the current on-board UPF is not the node information of the on-board UPF of the opposite end, determine the node information of the next-hop on-board UPF according to the node information of the on-board UPF of the opposite end;

The node information of the on-board UPF that sends the service message to the next hop through the inter-satellite link.

Further, due to limited satellite resources, in order to reduce the load on the satellite, in this embodiment, only communications with higher security requirements are allowed to communicate directly through the satellite. Preferably, the voice service can be directly transmitted through the satellite, thus, It also includes: detecting the type of the received service message;

If the service message is a voice message, then write the node information of the on-board UPF of the opposite end in the service message, and pass the node information of the star-borne UPF of the opposite end through the inter-satellite link The file is sent to the on-board UPF of the opposite end.

Among them, for the message of non-voice service, after receiving the service message, the on-board UPF converts the ground gateway station and forwards it to the destination end through the ground gateway station.

In this embodiment, when the on-board UPFs at both ends of the communication know the node information of the on-board UPF at the opposite end, they can transmit service data between the on-board UPFs based on the node information of the on-board UPF at the opposite end. It realizes the direct communication between satellites and satellites, further improving the security of data transmission.

Example 4

Referring to FIG. 6 , it shows a schematic structural diagram of a device for end-to-end communication provided by an embodiment of the present invention, wherein the device is applied to a ground gateway station, and the ground gateway station includes: a core network Control plane, ground UPF and business network, it is characterized in that, described device comprises:

The first sending unit 501 is configured to add the node information of the second on-board UPF to the first response message after the core network control plane to which the second satellite terminal belongs receives the first response message, and carry the second The first response message of the node information of the spaceborne UPF is sent to the service network to which the first satellite terminal belongs; the first response message represents the establishment of the dedicated service flow of the second satellite terminal;

The second sending unit 502 is configured to analyze the first response message carrying the node information of the second on-board UPF by the service network to which the first satellite terminal belongs, and obtain the second on-board UPF to which the second satellite terminal belongs UPF node information, and send the node information of the second on-board UPF to the first on-board UPF through the core network control plane to which the first satellite terminal belongs;

The third sending unit 503 is configured to add the node information of the first on-board UPF to the second response when the core network control plane to which the first satellite terminal belongs receives the second response message. In the message, the second response message carrying the node information of the first on-board UPF is sent to the service network to which the second satellite terminal belongs; the second response message represents the case of a dedicated service flow created by the first satellite terminal ;

The fourth sending unit 504 is configured to analyze the second response message carrying the node information of the first on-board UPF by the service network to which the second satellite terminal belongs, to obtain the node information of the first on-board UPF, and send The node information of the first on-board UPF is sent to the second on-board UPF through the core network control plane to which the second satellite terminal belongs; the node information of the first on-board UPF and the node information of the second on-board UPF are the Describe the basis for data transmission between the first satellite terminal and the second satellite terminal through the satellite.

Optionally, the second sending unit includes:

a generating unit, configured to generate a message for creating a dedicated service flow request of the first satellite terminal;

The first adding subunit is used to add the node information of the second on-board UPF in the message of creating the dedicated service flow request of the first satellite terminal;

The first sending subunit is used for the service network to which the first satellite terminal belongs to send the message of creating the dedicated service flow request of the first satellite terminal carrying the node information of the second on-board UPF to the service network to which the first satellite terminal belongs core network control plane;

The first parsing subunit is used for the core network control plane to which the first satellite terminal belongs to parse the message of creating the dedicated service flow request of the first satellite terminal with the node information of the second on-board UPF, and obtain the second Node information of onboard UPF;

Sending the node information of the second on-board UPF to the first on-board UPF.

Optionally, the fourth sending unit includes:

The second sending subunit is used for the service network to which the second satellite terminal belongs to send an update message of an update request to the control plane of the core network to which the second satellite terminal belongs, and to add the node information of the second on-board UPF to the update message ;

The third sending subunit is configured to send the update message carrying the node information of the second on-board UPF to the core network control plane to which the second satellite terminal belongs;

The control plane of the core network to which the second satellite terminal belongs parses the update message, obtains the node information of the second on-board UPF, and sends the node information of the second on-board UPF to the first on-board UPF.

Optionally, also include:

The first session plane creation request sending unit is configured to, in response to the first preset condition, control the core network to which the first satellite terminal belongs to send a session plane creation request to the first on-board UPF, so that the first on-board UPF joins on the data transmission path to the first satellite terminal;

The second session plane creation request sending unit is configured to, in response to the second preset condition, control the core network to which the second satellite terminal belongs to send a session plane creation request to the second on-board UPF, so that the second on-board UPF joins on the data transmission path to the second satellite terminal.

Optionally, the first preset condition is:

A request from the first satellite terminal to access the ground gateway station;

or

Create a dedicated service flow request for the first satellite terminal.

Optionally, the second preset condition is:

A request for the second satellite terminal to access the ground gateway station;

or

Create a dedicated service flow request for the second satellite terminal.

Optionally, if the N6 interface is used between the on-board UPFs, the node information of the first on-board UPF is the address of the N6 interface of the first on-board UPF, and the node information of the second on-board UPF is the address of the second on-board UPF. N6 interface address of UPF;

If the N9 interface is used between the onboard UPFs, the node information of the first onboard UPF is the label information of the second onboard UPF, and the node information of the second onboard UPF is the label information of the second onboard UPF The node information of the first on-board UPF and the node information of the second on-board UPF are the basis for data transmission between the first satellite terminal and the second satellite terminal via the satellite.

Through the device of the embodiment of the present invention, the various parts constituting the ground gateway station can send the node information of the spaceborne UPF at the opposite end to the node of the spaceborne UPF by modifying the signaling transmitted to each other, thus realizing the spaceborne UPF The transmission of node information provides a guarantee for the realization of satellite-to-satellite direct communication.

Example 5

Referring to FIG. 7 , it shows a schematic structural diagram of an end-to-end communication device disclosed in an embodiment of the present invention. The device is applied to a spaceborne UPF, and the device includes:

The first receiving unit 601 is used for the first on-board UPF to receive the node information of the second on-board UPF sent by the control plane of the core network to which the first satellite terminal belongs; The UPF of the incoming satellite;

The second receiving unit 602 is used for the second on-board UPF to receive the node information of the first on-board UPF sent by the control plane of the core network to which the second satellite terminal belongs; The UPF of the incoming satellite;

The service message sending unit 603 is configured to send a service message to the corresponding target on-board UPF after any one of the first satellite terminal and the second satellite terminal sends a service message, and the target on-board UPF sends the service message in the service message. Write the node information of the on-board UPF of the opposite end in the text;

The data transmission unit 604 is configured to send the service message to the space-borne UPF of the opposite end through the node information of the space-borne UPF of the opposite end and the inter-satellite link, and send the service message to the UPF of the opposite end through the UPF of the opposite end satellite terminal.

Optionally, the data transmission unit includes:

For any on-board UPF:

The analysis subunit is used to analyze the service message after receiving the service message, and obtain the node information of the on-board UPF at the opposite end;

The determining subunit is used to determine the node information of the next-hop on-board UPF according to the node information of the on-board UPF on the opposite end if the current on-board UPF is not the node information of the on-board UPF on the opposite end;

The sending subunit is configured to send the service message to the node information of the next-hop on-board UPF through the inter-satellite link.

Optionally, also include:

The detection subunit is used to detect the type of the received service message;

The data transmission subunit is used to write the node information of the on-board UPF of the opposite end in the service message if the service message is a voice service, and pass the inter-satellite link and the node of the on-board UPF of the opposite end The message sends the service message to the on-board UPF at the opposite end.

Through the device of this embodiment, when the on-board UPFs at both ends of the communication know the node information of the on-board UPF on the opposite end, they can transmit service data between the on-board UPFs based on the node information on the on-board UPF on the opposite end. As a result, direct communication between satellites and satellites is realized, further improving the security of data transmission.

Example 6

Referring to FIG. 8, it shows a schematic structural diagram of a communication system provided by an embodiment of the present invention. In this embodiment, the communication system includes:

Ground gateway station 701 and spaceborne UPF702;

The ground gateway station 701 executes the end-to-end communication method described in Embodiment 2 above;

The on-board UPF 702 executes a method for communicating end-to-end as described in Embodiment 3 above.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (12)

1. A method for end-to-end communication, characterized in that the method is applied to a ground gateway station, and the ground gateway station includes: a core network control plane, a ground UPF and a service network, characterized in that the method include:

   After receiving the first response message, the core network control plane to which the second satellite terminal belongs adds the node information of the second on-board UPF to the first response message, and sends the node information carrying the node information of the second on-board UPF to the first response message. A response message is sent to the service network to which the first satellite terminal belongs; the first response message represents the establishment of the dedicated service flow of the second satellite terminal;

   The service network to which the first satellite terminal belongs parses the first response message carrying the node information of the second on-board UPF, obtains the node information of the second on-board UPF to which the second satellite terminal belongs, and passes the The core network control plane to which the first satellite terminal belongs sends the node information of the second on-board UPF to the first on-board UPF;

   When the core network control plane to which the first satellite terminal belongs receives the second response message, the core network control plane to which the first satellite terminal belongs adds the node information of the first on-board UPF to the second response message, and carries the second response message. A second response message of the node information of the satellite-borne UPF is sent to the service network to which the second satellite terminal belongs; the second response message represents the case of a dedicated service flow created by the first satellite terminal;

   The service network to which the second satellite terminal belongs analyzes the second response message carrying the node information of the first on-board UPF, obtains the node information of the first on-board UPF, and sends the node information of the first on-board UPF to The node information is sent to the second on-board UPF through the core network control plane to which the second satellite terminal belongs; the node information of the first on-board UPF and the node information of the second on-board UPF are the first satellite terminal and the second on-board UPF. The basis for data transmission between satellite terminals through satellites.
2. The method according to claim 1, wherein the sending the node information of the second on-board UPF to the first on-board UPF through the core network control plane to which the first satellite terminal belongs includes:

   generating a message to create a dedicated traffic flow request for the first satellite terminal;

   Adding the node information of the second on-board UPF to the message of creating the dedicated service flow request of the first satellite terminal;

   The service network to which the first satellite terminal belongs sends a message carrying the node information of the second satellite-borne UPF to create a dedicated service flow request for the first satellite terminal to the core network control plane to which the first satellite terminal belongs;

   The core network control plane to which the first satellite terminal belongs analyzes the message with the node information of the second on-board UPF to create a dedicated service flow request for the first satellite terminal, and obtains the node information of the second on-board UPF;

   Sending the node information of the second on-board UPF to the first on-board UPF.
3. The method according to claim 1, wherein the sending the node information of the first on-board UPF to the second on-board UPF through the core network control plane to which the second satellite terminal belongs comprises:

   The service network to which the second satellite terminal belongs sends an update message of an update request to the core network control plane to which the second satellite terminal belongs, and adds the node information of the second on-board UPF to the update message;

   sending an update message carrying the node information of the second on-board UPF to the core network control plane to which the second satellite terminal belongs;

   The control plane of the core network to which the second satellite terminal belongs parses the update message, obtains the node information of the second on-board UPF, and sends the node information of the second on-board UPF to the first on-board UPF.
4. The method according to claim 1, further comprising:

   In response to the first preset condition, the core network to which the first satellite terminal belongs controls and sends a session plane creation request to the first on-board UPF, so that the first on-board UPF is added to the data transmission path of the first satellite terminal;

   In response to the second preset condition, the core network to which the second satellite terminal belongs controls to send a session plane establishment request to the second on-board UPF, so that the second on-board UPF joins the data transmission path of the second satellite terminal.
5. The method according to claim 4, wherein the first preset condition is:

   A request from the first satellite terminal to access the ground gateway station;

   or

   Create a dedicated service flow request for the first satellite terminal.
6. The method according to claim 1, wherein the second preset condition is:

   A request for the second satellite terminal to access the ground gateway station;

   or

   Create a dedicated service flow request for the second satellite terminal.
7. The method according to claim 1, wherein if the N6 interface is used between the on-board UPFs, the node information of the first on-board UPF is the N6 interface address of the first on-board UPF, and the second on-board UPF The node information carrying UPF is the N6 interface address of the second onboard UPF;

   If the N9 interface is used between the onboard UPFs, the node information of the first onboard UPF is the label information of the second onboard UPF, and the node information of the second onboard UPF is the label information of the second onboard UPF The node information of the first on-board UPF and the node information of the second on-board UPF are the basis for data transmission between the first satellite terminal and the second satellite terminal via the satellite.
8. The method according to any one of claims 1-7, wherein the service network is an IMS network.
9. A method for end-to-end communication, characterized in that the method is applied to an on-board UPF, and the method includes:

   The first on-board UPF receives the node information of the second on-board UPF sent by the core network control plane to which the first satellite terminal belongs; the first on-board UPF is the UPF of the satellite accessed by the first satellite terminal;

   The second on-board UPF receives the node information of the first on-board UPF sent by the core network control plane to which the second satellite terminal belongs; the second on-board UPF is the UPF of the satellite accessed by the second satellite terminal;

   After any one of the first satellite terminal and the second satellite terminal sends a service message to the corresponding target on-board UPF, the target on-board UPF writes the service message into the opposite end of the on-board UPF node information;

   The service message is sent to the space-borne UPF of the opposite end through the node information of the space-borne UPF of the opposite end and the inter-satellite link, and the service message is sent to the satellite terminal of the opposite end through the UPF of the opposite end.
10. The method according to claim 9, wherein the sending the service message to the satellite terminal at the opposite end through the UPF at the opposite end includes:

    For any on-board UPF:

    After receiving the service message, analyze the service message to obtain the node information of the on-board UPF at the opposite end;

    If the current on-board UPF is not the node information of the on-board UPF of the opposite end, determine the node information of the next-hop on-board UPF according to the node information of the on-board UPF of the opposite end;

    The node information of the on-board UPF that sends the service message to the next hop through the inter-satellite link.
11. The method according to claim 9, wherein, after the first on-board UPF or the second on-board UPF receives the service message, further comprising:

    Detect the type of the received service message;

    If the service message is a voice service, then write the node information of the on-board UPF at the opposite end in the service message, and write the service message through the inter-satellite link and the node information of the on-board UPF at the opposite end Sent to the peer's onboard UPF.
12. A communication system, characterized in that it includes:

    Ground gateway station and spaceborne UPF;

    The ground gateway station is used to implement the end-to-end communication method described in any one of claims 1-8 above;

    The on-board UPF is used to execute the end-to-end communication method described in any one of claims 9-11.

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