CN113300751B - Mobile gateway station, communication satellite, low-orbit satellite communication system and using method - Google Patents
Mobile gateway station, communication satellite, low-orbit satellite communication system and using method Download PDFInfo
- Publication number
- CN113300751B CN113300751B CN202010106715.0A CN202010106715A CN113300751B CN 113300751 B CN113300751 B CN 113300751B CN 202010106715 A CN202010106715 A CN 202010106715A CN 113300751 B CN113300751 B CN 113300751B
- Authority
- CN
- China
- Prior art keywords
- gateway station
- data
- mobile gateway
- satellite
- communication
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a mobile gateway station, a communication satellite, a low-orbit satellite communication system and a use method, wherein the use method comprises the following steps: the mobile gateway station is used for receiving and transmitting data with the communication satellite, and processing and routing the received and transmitted data; a communication satellite for transceiving data with a user terminal via a user link; determining whether a feeder link can be established with a ground gateway station, and determining whether a connection can be established with the mobile gateway station; when the data is transmitted and received with the user terminal, the feeder link is determined not to be established with the ground gateway station, when the connection with the mobile gateway station can be established, the data is transmitted and received with the mobile gateway station, when the feeder link is determined not to be established with the ground gateway station, and when the connection with the mobile gateway station can not be established, the data is transmitted and received with other communication satellites in a relay mode. By adopting the invention, even if the ground gateway station has a problem in the communication system, the problem that the communication cannot be normally carried out can not occur.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a mobile gateway station, a communication satellite, a low-orbit satellite communication system and a using method.
Background
For the low earth orbit satellite constellation system in the bent pipe mode, the normal communication mode is that a user terminal communicates with a satellite (a communication link is called a user link), the satellite amplifies and frequency-converts a user signal and then communicates with a gateway station (the communication link is called a feeder link), namely, the complete communication link consists of the user link and the feeder link. In general, a gateway station is built on earth, and therefore is also called a ground gateway station, and mainly includes an access network, a core network, a network management and operation unit, etc., and its main function is to receive or transmit a user signal forwarded by a satellite and perform corresponding service processing.
Fig. 1 is a schematic diagram of administration of satellites by ground gateway stations, and to ensure seamless coverage of the world, a low-earth satellite constellation system in a bent-tube mode generally requires hundreds of satellites and dozens of gateway stations, and each gateway station can control more than ten satellites. Assuming that a low-earth constellation consists of 864 satellites (including 18 orbital planes and 48 satellites per orbital plane), and the ground is constructed with 72 gateway stations in total, each gateway station needs to manage 12 satellites (assuming 4 satellites per orbital plane corresponding to 3 orbital planes) on average, as shown in fig. 1. The ground gateway station which the satellite belongs to changes correspondingly along with the movement of the satellite, and when the visible range of a certain gateway station is exceeded, the satellite can be switched to be connected with another gateway station. For example, the 1 st satellite S for the 1 st orbital plane of FIG. 11，1At time a, ground gateway station GW1 is connected, and as it moves, it moves out of view of ground gateway station GW1 at time B, turning into connection with ground gateway station GW 2.
The defects of the prior art are as follows: the communication is not possible due to the ground gateway station.
Disclosure of Invention
The invention provides a mobile gateway station, a communication satellite, a low-orbit satellite communication system and a using method, which are used for solving the problem that normal communication cannot be realized due to a ground gateway station.
The embodiment of the invention provides a mobile gateway station, which is positioned at a satellite and comprises: an access network element and/or a core network element, wherein:
an access network unit for transceiving data with a communication satellite;
and the core network unit is used for processing and routing the data transmitted and received by the access network unit.
In an implementation, the access network element is further configured to transceive data with the user terminal.
In the implementation, the access network unit transmits and receives data according to the version above 5G.
In an implementation, the access network unit comprises DUs and/or CUs.
In an implementation, the core network element includes a UP and/or a CP.
The embodiment of the invention provides a mobile gateway station, which is positioned at a satellite and comprises:
a processor for reading the program in the memory and executing the following processes:
receiving and transmitting data with a communication satellite; and/or the presence of a gas in the gas,
processing and routing the received and transmitted data;
a transceiver for receiving and transmitting data under the control of the processor.
An embodiment of the present invention provides a communication satellite, including:
the terminal transceiver module is used for transceiving data with a user terminal through a user link;
a determining module, configured to determine whether a feeder link can be established with a ground gateway station, and determine whether a connection can be established with the mobile gateway station;
the receiving and sending module is used for determining that a feed link cannot be established with the ground gateway station when the receiving and sending module receives and sends data with the user terminal, and receiving and sending data with the mobile gateway station when the receiving and sending module establishes connection with the mobile gateway station; when it is determined that the feeder link cannot be established with the ground gateway station and the connection cannot be established with the mobile gateway station, data is transmitted and received to and from other communication satellites in a relay manner.
In an implementation, the determining module is further configured to determine whether the feeder link can be established with the ground gateway station, determine whether the connection can be established with the mobile gateway station as described above, according to one or a combination of the following manners:
network pre-configuration, network control and communication satellite judgment.
In an implementation, the method further comprises the following steps:
and the target judgment module is used for determining a target mobile gateway station and/or a target communication satellite for data transceiving for the transceiving module according to a preset strategy.
An embodiment of the present invention provides a communication satellite, including:
a processor for reading the program in the memory and executing the following processes:
receiving and transmitting data with a user terminal through a user link;
determining whether a feeder link can be established with a ground gateway station, and determining whether a connection can be established with the mobile gateway station;
when receiving and transmitting data with a user terminal, determining that a feed link cannot be established with a ground gateway station, and when establishing connection with a mobile gateway station, performing data receiving and transmitting with the mobile gateway station; when determining that a feed link cannot be established with the ground gateway station and connection cannot be established with the mobile gateway station, performing data transceiving with other communication satellites in a relay mode;
a transceiver for receiving and transmitting data under the control of the processor.
The embodiment of the invention provides a low-orbit satellite communication system, which comprises: the above mobile gateway station, the above communication satellite, wherein:
the mobile gateway station is used for receiving and transmitting data with the communication satellite, processing and routing the received and transmitted data;
a communications satellite for:
receiving and transmitting data with a user terminal through a user link;
determining whether a feeder link can be established with a ground gateway station, and determining whether a connection can be established with the mobile gateway station;
when receiving and transmitting data with a user terminal, determining that a feeder link cannot be established with a ground gateway station, and when establishing connection with a mobile gateway station, performing data receiving and transmitting with the mobile gateway station; when the feeder link can not be established with the ground gateway station and the connection can not be established with the mobile gateway station, the data is transmitted and received with other communication satellites in a relay mode.
In an implementation, the method further comprises the following steps:
and the ground gateway station is used for processing and routing data transmitted and received by the communication satellite through the feeder link.
In implementation, the mobile gateway station is further configured to perform data transceiving with the user terminal through the user link; and/or the presence of a gas in the atmosphere,
the communication satellite is further configured to relay data transmitted by other communication satellites.
The embodiment of the invention provides a using method of the low-orbit satellite communication system, which comprises the following steps:
the communication satellite receives data sent by a user terminal through a user link;
the communication satellite sends the received data to the mobile gateway station for receiving and sending the data;
the mobile gateway station processes and routes data sent by the communication satellite;
and/or the presence of a gas in the gas,
the mobile gateway station processes and routes the data and sends the data to the terminal to the communication satellite;
a communication satellite receives data sent to a terminal;
the communication satellite transmits data destined for the terminal to the user terminal over the user link.
In an implementation, the method further comprises the following steps:
and the communication satellite determines a target for receiving data from the mobile gateway station, the ground gateway station or the communication satellite according to a preset strategy and then sends the data sent by the user terminal, wherein the preset strategy is pre-configured by a network, controlled by the network or judged by the communication satellite.
In an implementation, the method further comprises the following steps:
after receiving the data sent by other communication satellites, the communication satellite determines a target for receiving the data from a mobile gateway station, a ground gateway station or the communication satellite according to a preset strategy, and then sends the data sent by other communication satellites, wherein the preset strategy is pre-configured by a network, controlled by the network or judged by the communication satellite.
The embodiment of the invention provides a computer readable storage medium, which stores a computer program for executing the method.
The invention has the following beneficial effects:
in the technical scheme provided by the embodiment of the invention, as the mobile gateway station can process and route the data received and transmitted by the communication satellite, correspondingly, for the communication satellite, when the communication satellite receives and transmits the data with the user terminal, the communication satellite determines that the feed link cannot be established with the ground gateway station, and when the communication satellite establishes connection with the mobile gateway station, the communication satellite receives and transmits the data with the mobile gateway station; when the feeder link can not be established with the ground gateway station and the connection can not be established with the mobile gateway station, the data is transmitted and received with other communication satellites in a relay mode. Therefore, even if the ground gateway station has a problem in the communication system, the problem that normal communication cannot be performed does not occur.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the administration of a satellite by a ground gateway station in the background art;
fig. 2 is a schematic structural diagram of a mobile gateway station 1 according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a mobile gateway station of an embodiment of the present invention 2;
fig. 4 is a schematic structural diagram of a DU access mobile gateway station in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a CU & DU access mobile gateway station structure in an embodiment of the present invention;
FIG. 6 is a diagram illustrating a DU & UP integrated mobile gateway station according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating a DU & CP integrated mobile gateway station according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a DU & CP & UP integrated mobile gateway station in an embodiment of the present invention;
FIG. 9 is a schematic diagram of a CU & DU & UP integrated mobile gateway station in an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a CU & DU & CP integrated mobile gateway station according to an embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a CU & DU & CP & UP integrated mobile gateway station according to an embodiment of the present invention;
FIG. 12 is a diagram illustrating a UP virtual mobile gateway station according to an embodiment of the present invention;
FIG. 13 is a diagram illustrating a CP virtual mobile gateway station according to an embodiment of the present invention;
fig. 14 is a diagram illustrating a CP & UP virtual mobile gateway station in accordance with an embodiment of the present invention;
fig. 15 is a schematic structural diagram of a communication satellite 1 according to an embodiment of the present invention;
fig. 16 is a schematic structural diagram of a communication satellite in an embodiment of the invention 2;
FIG. 17 is a block diagram of a low earth orbit satellite communication system according to an embodiment of the invention;
FIG. 18 is a diagram illustrating a low earth orbit satellite constellation according to an embodiment of the present invention;
FIG. 19 is a flow chart illustrating a method for implementing the low earth orbit satellite communication system according to an embodiment of the present invention;
fig. 20 is a communication diagram of a satellite communication system with only inter-satellite links between mobile gateway stations and communication satellites according to a first application of the embodiment of the present invention;
fig. 21 is a schematic diagram of a feeder link relayed by a communication satellite according to the second application mode of the embodiment of the present invention;
fig. 22 is a communication diagram of a satellite communication system having both a ground gateway station and a mobile gateway station according to a third application mode of the embodiment of the present invention.
Detailed Description
The inventor notices in the process of invention that:
when the number of ground gateway stations is insufficient, the location of the ground gateway stations is inappropriate, or the ground gateway stations are destroyed and become unusable, this may result in some satellites not having feeder links connected and thus failing to communicate properly. For example, with the satellite S of FIG. 1 described above1，1For example, assume that it is connected to ground gateway station GW1 at time t1 to serve coverage area 1 and to ground gateway station GW2 at time t2 to serve coverage area 2. Since the ground gateway station GW1 is intact, the user terminal UE1 in coverage area 1 can obtain normal communication; since the ground gateway station GW2 is damaged, the UE2 in coverage area 2 can communicate with the satellite S1，1With subscriber links connected but without feeder linksInability to communicate, making ground coverage discontinuous; similarly, when the communicating user terminal UE1 moves from coverage area 1 to coverage area 2, its communication will be interrupted.
Based on this, according to the technical solution provided in the embodiment of the present invention, in the case that there is no suitable ground gateway station, the low earth constellation satellite communication system in the bent pipe mode obtains the connection of the feeder link through the gateway station (referred to as "mobile gateway station" for short) established on a part of satellites, so as to maintain the normal communication.
The following describes embodiments of the present invention with reference to the drawings.
In the course of the description, the implementation of the mobile gateway station and the communication satellite, the terrestrial gateway station and the terminal will be described separately, and then the examples of their implementation will be given to better understand the implementation of the solution given in the embodiment of the present invention, and the implementation of the low-orbit satellite communication system will be described, and such description does not mean that they must be implemented together or separately, and actually, when they are implemented separately, they also each solve the problem on their own side, and when they are used in combination, they will obtain better technical effect.
Fig. 2 is a schematic diagram of a mobile gateway station 1, which is located at a satellite and as shown, may include: access network element 201 and/or core network element 202, wherein:
an access network unit 201 for transceiving data with a communication satellite;
the core network unit 202 is configured to process and route data received and transmitted by the access network unit.
In an implementation, the access network element may be further configured to transceive data with the user terminal.
In the implementation, the access network unit transmits and receives data according to the version above 5G.
Specifically, the access network unit performs data transceiving with the terminal according to a 5G new air interface (NR) technology defined by Release 15 of the 3GPP organization and the above versions, and also includes improvement performed based on the 5G new air interface (NR) to adapt to a satellite communication scenario.
In an implementation, the access network unit comprises DUs and/or CUs.
In an implementation, the core network element includes a UP and/or a CP.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware in the practice of the invention.
Fig. 3 is a schematic diagram of a mobile gateway station 2, which is located at a satellite and as shown, may include:
a processor 300 for reading the program in the memory 320, and executing the following processes:
receiving and transmitting data with a communication satellite; and/or the presence of a gas in the atmosphere,
processing and routing the received and transmitted data;
a transceiver 310 for receiving and transmitting data under the control of the processor 300.
In practice, the data may be further transmitted to and received from the user terminal.
Where in fig. 3, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 300 and memory represented by memory 320. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 310 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The processor 300 is responsible for managing the bus architecture and general processing, and the memory 320 may store data used by the processor 300 in performing operations.
A specific implementation of the mobile gateway station is explained below.
In contrast to communication satellites, mobile gateway stations have a similar functionality as terrestrial gateway stations, which can be connected to one or more communication satellites and are responsible for the connection and management of links.
Fig. 4 is a schematic diagram of a DU access mobile gateway station structure, fig. 5 is a schematic diagram of a CU & DU access mobile gateway station structure, fig. 6 is a schematic diagram of a DU & UP integrated mobile gateway station structure, fig. 7 is a schematic diagram of a DU & CP integrated mobile gateway station structure, fig. 8 is a schematic diagram of a DU & CP & UP integrated mobile gateway station structure, fig. 9 is a schematic diagram of a CU & DU & UP integrated mobile gateway station structure, fig. 10 is a schematic diagram of a CU & DU & CP integrated mobile gateway station structure, fig. 11 is a schematic diagram of a CU & CP & UP integrated mobile gateway station structure, fig. 12 is a schematic diagram of a UP virtual mobile gateway station structure, fig. 13 is a schematic diagram of a CP virtual mobile gateway station structure, fig. 14 is a schematic diagram of a CP & UP virtual mobile gateway station structure, wherein a network management and operation unit in the figure is illustrated by dashed boxes, meaning that the functional boxes may or may not be in a satellite, hard requirements are not made. As shown, the mobile gateway stations can be divided into the following three basic types based on their specific functions:
(1) the mobile gateway station only has the function of an access network, and can be called as the access mobile gateway station for short;
(2) the mobile gateway station with the functions of an access network and a core network can be called as a comprehensive mobile gateway station for short;
(3) the mobile gateway station with only core network function may be referred to as a virtual mobile gateway station for short.
Wherein, depending on the composition of the access network and the core network, such as whether the access network includes only DU (Distributed Unit) or only DU and CU (Centralized Unit), whether the core network includes only UP (User Plane) or only CP (Control Plane) or both CP and UP, the above-mentioned 3 types of basic gateway stations can be further decomposed into DU access mobile gateway stations, CU & DU access mobile gateway stations, DU & UP integrated mobile gateway stations, DU & CP & UP integrated mobile gateway stations, CU & DU & CP integrated mobile gateway stations, CU & DU & CP & UP integrated mobile gateway stations, UP virtual mobile gateway stations, CP & UP virtual mobile gateway stations, and the specific structure of each mobile gateway station can be referred to fig. 4 to fig. 14.
Fig. 15 is a schematic structural diagram 1 of a communication satellite, which may include:
a terminal transceiver module 1501, configured to receive and transmit data with a user terminal through a user link;
a determining module 1502 for determining whether a feeder link can be established with a ground gateway station and determining whether a connection can be established with a mobile gateway station;
a transceiving module 1503, configured to determine that a feeder link cannot be established with the ground gateway station when transceiving data with the user terminal, and perform data transceiving with the mobile gateway station when establishing a connection with the mobile gateway station; when the feeder link can not be established with the ground gateway station and the connection can not be established with the mobile gateway station, the data is transmitted and received with other communication satellites in a relay mode.
In an implementation, the determining module is further configured to determine whether the feeder link can be established with the ground gateway station, and determine whether the connection can be established with the mobile gateway station according to one or a combination of the following manners:
network pre-configuration, network control and communication satellite judgment.
In an implementation, the method may further include:
and the target judging module 1504 is used for determining a target mobile gateway station and/or a target communication satellite for data transceiving for the transceiving module according to a preset strategy.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware in the practice of the invention.
Fig. 16 is a schematic structural diagram of a communication satellite 2, which may include:
the processor 1600, which is used to read the program in the memory 1620, executes the following processes:
receiving and transmitting data with a user terminal through a user link;
determining whether a feeder link can be established with a ground gateway station, and determining whether a connection can be established with a mobile gateway station;
when receiving and transmitting data with a user terminal, determining that a feed link cannot be established with a ground gateway station, and when establishing connection with a mobile gateway station, performing data receiving and transmitting with the mobile gateway station; when determining that the feeder link cannot be established with the ground gateway station and the connection cannot be established with the mobile gateway station, carrying out data transceiving with other communication satellites in a relay mode;
a transceiver 1610 for receiving and transmitting data under the control of the processor 1600.
In implementation, the target mobile gateway station and/or the target communication satellite for data transmission may be determined for the transmission module according to a preset policy.
In fig. 16, among other things, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by the processor 1600 and various circuits of the memory represented by the memory 1620 linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1610 can be a number of elements including a transmitter and receiver providing a means for communicating with various other apparatus over a transmission medium. The processor 1600 is responsible for managing the bus architecture and general processing, and the memory 1620 may store data used by the processor 1600 in performing operations.
Fig. 17 is a schematic structural diagram of a low earth orbit satellite communication system, as shown, including: mobile gateway station, communication satellite, wherein:
the mobile gateway station is used for receiving and transmitting data with the communication satellite, processing and routing the received and transmitted data;
a communications satellite for:
receiving and transmitting data with a user terminal through a user link;
determining whether a feeder link can be established with a ground gateway station, and determining whether a connection can be established with the mobile gateway station;
when receiving and transmitting data with a user terminal, determining that a feeder link cannot be established with a ground gateway station, and when establishing connection with a mobile gateway station, performing data receiving and transmitting with the mobile gateway station; when it is determined that the feeder link cannot be established with the ground gateway station and the connection cannot be established with the mobile gateway station, data is transmitted and received to and from other communication satellites in a relay manner.
In the implementation, the method can further comprise the following steps:
and the ground gateway station is used for processing and routing data transmitted and received by the communication satellite through the feeder link.
In practice, the communication satellite is further configured to relay data transmitted by other communication satellites.
In an implementation, the mobile gateway station is further configured to transceive data with the user terminal over the user link.
Specifically, for the low earth orbit satellite constellation in the bent pipe mode, the communication system based on the mobile gateway station can ensure that the connection of the feeder link can be established through the mobile gateway station when the ground gateway station is unavailable, so as to maintain a normal communication process, which is described in the following from the overall perspective.
With a mobile gateway station, satellites in the low earth orbit satellite constellation will be classified into at least 2 types: one of the two is a communication satellite, which mainly plays a role of transparent forwarding, and the communication satellite 2 shown in fig. 17 is used as a relay of the communication satellite 1, and when the communication satellite 2 and the communication satellite 1 cannot establish connection with the ground gateway station 1, data is forwarded to the mobile gateway station; the second is a mobile gateway station, which is responsible for the processes of user access, signal processing and the like, and plays the role of the gateway station. An inter-satellite link is configured between the communication satellite and the mobile gateway station, and when the communication satellite is connected with the mobile gateway station, the communication satellite selects the mobile gateway station closest to the communication satellite to connect, for example, the inter-satellite link is configured between the communication satellite 2, the communication satellite 3 and the mobile gateway station as shown in fig. 17, the UE performs data transceiving with the communication satellite 3, and when the communication satellite 3 cannot establish a connection with the ground gateway station 1 and the ground gateway station 2, the data is forwarded to the mobile gateway station.
Assuming that there are K satellites (corresponding to N orbital planes, each orbital plane having M satellites) in the whole constellation, the mobile gateway stations may be distributed in the constellation according to a certain rule. Fig. 18 is a schematic diagram of a constellation of low earth orbit satellites showing a uniform distribution of mobile gateway stations, wherein, assuming that the communication satellites and the mobile gateway stations are uniformly staggered, every n orbital planes have mobile gateway stations, and every m communication satellites have mobile gateway stations on each orbital plane.
The use of a satellite communication system is explained below.
Fig. 19 is a flow chart illustrating an implementation of a method for using a low earth orbit satellite communication system, which may include:
when transmitting uplink data, that is, when the user terminal sends data, the following may be performed:
the mobile gateway station processes and routes data transmitted by the communication satellite, step 1903.
When transmitting downlink data, that is, receiving data by the ue, the following may be performed:
step 1904, the mobile gateway station processes and routes, sends data to the terminal to the communication satellite;
the communication satellite sends 1906 data destined for the terminal to the user terminal over the user link.
In an implementation, the method further comprises the following steps:
and the communication satellite determines a target for receiving data from the mobile gateway station, the ground gateway station or the communication satellite according to a preset strategy and then sends the data sent by the user terminal, wherein the preset strategy is pre-configured by a network, controlled by the network or judged by the communication satellite.
In an implementation, the method further comprises the following steps:
after receiving data sent by other communication satellites, the communication satellite determines a target for receiving the data from a mobile gateway station, a ground gateway station or the communication satellite according to a preset strategy, and then sends the data sent by other communication satellites, wherein the preset strategy is pre-configured by a network, controlled by the network or judged by the communication satellite.
Specifically, in practical applications of the low earth orbit satellite communication system based on the mobile gateway station, at least the following different application modes can be provided according to whether the ground gateway station exists and whether a universal inter-satellite link exists (i.e. all satellites can be connected), which is described below.
The application method is as follows:
in the case where there is no terrestrial gateway station at all and an inter-satellite link exists only between the communication satellite and the mobile gateway station, the communication of the low earth satellite communication system will depend entirely on the mobile gateway station, and the communication mode can be classified into the following basic types:
(1) when the area of the user is covered by the communication satellite, the user link is still connected with the communication satellite by the user terminal, the feed link is connected with the mobile gateway station by the communication satellite, and the communication satellite selects the mobile gateway station closest to the user link to be connected;
(2) when the area to which the user belongs is covered by the mobile gateway station, the user communicates directly with the mobile gateway station without a feeder link.
FIG. 20 is a communication diagram of a satellite communication system with only inter-satellite links between mobile gateway stations and communication satellites in a first application, wherein a coverage area 1 of a user terminal UE1 is shown as being defined by a communication satellite S1，1Coverage, its communication process including UE1 and communication satellite S1，1Formed user link 1 and communication satellite S1，1And a mobile gateway station S1，mThe composed feeder link 1 is composed;
the coverage area 2 to which the user terminal UE2 belongs is formed by a mobile gateway station S1，mCoverage, the communication process of which comprises only the UE2 and the mobile gateway station S1，mThe constituent subscriber links 2 no longer require feeder links.
The application mode two is as follows:
in the case where there is no ground gateway station at all, but inter-satellite links can exist between any satellites, the communication modes of the low-earth satellite communication system can be classified into the following basic types:
(1) when the area of the user is covered by the communication satellite, if a mobile gateway station exists in the coverage distance of the inter-satellite link of the communication satellite, the user link is still connected with the communication satellite through the user terminal, and the feed link is connected with the nearest mobile gateway station in the coverage distance of the inter-satellite link of the communication satellite;
(2) when the area of the user is covered by the communication satellite, if no mobile gateway station exists in the inter-satellite link coverage distance of the communication satellite, the communication satellite can be connected with other communication satellites firstly, and then the other communication satellites are connected with the mobile gateway station to form connection similar to a relay;
(3) when the area to which the user belongs is covered by the mobile gateway station, the user communicates directly with the mobile gateway station without a feeder link.
Fig. 21 is a schematic diagram of a communication satellite relayed feeder link in the second application, in which a coverage area 1 to which a user terminal UE1 belongs is shown as a communication satellite S1，1Coverage due to communication satellite S1，1And a mobile gateway station S1，mInter-satellite link between them is not available, communication satellite S1，1First-and communication satellite S1，2Connected to, and then received by, a communications satellite S1，2And a mobile gateway station S1，mIs connected to form a communication satellite S1，2A feeder link of the relay.
The application mode is three:
in the case of a terrestrial gateway station, the communication of the low earth satellite communication system will depend on both the terrestrial and mobile gateway stations, and the communication mode can be classified into the following basic types:
(1) when the area of the user is covered by the communication satellite, the user link is still connected with the communication satellite by the user terminal, and the feed link is connected with the ground gateway station by the communication satellite;
(2) when the area of the user is covered by the communication satellite, the user link is still connected with the communication satellite by the user terminal, the feed link is connected with the mobile gateway station by the communication satellite, and the communication satellite selects the mobile gateway station closest to the communication satellite to connect;
(3) when the area of the user is covered by the mobile gateway station, the user directly communicates with the mobile gateway station without a feeder link;
(4) when a mobile gateway station does not contain a core network or only contains partial core network functions, the mobile gateway station is also required to be connected with a ground gateway station with a core network;
(5) when the inter-satellite link can exist between any satellites, on one hand, the communication satellite can play a role of relay to connect the communication satellite and the mobile gateway station, and on the other hand, the mobile gateway station without the corresponding core network function can also be connected with other mobile gateway stations with the core network function.
FIG. 22 is a communication diagram of a satellite communication system with both a ground gateway station and a mobile gateway station according to the third application, wherein the coverage area 1 of the user terminal UE1 is defined by a communication satellite S1，1Coverage, its communication process including UE1 and communication satellite S1，1Formed user link 1 and communication satellite S1，1A feeder link 1 formed with a ground gateway station GW 1;
the coverage area 2 to which the user terminal UE2 belongs is defined by a communication satellite S1，2Overlay, communication satellite S1，2In response to the ground gateway station GW2, the ground gateway station GW2 is destroyed and needs to be replaced by a mobile gateway station, so that the communication process includes UE2 and communication satellite S1，2Formed user link 2 and communication satellite S1，2And a mobile gateway station S1，mThe composed feeder link 2;
the coverage area 3 to which the user terminal UE3 belongs is formed by a mobile gateway station S1，mCoverage, the communication process of which comprises only the UE3 and the mobile gateway station S1，mThe constituent subscriber links 3 no longer require feeder links. When moving the gateway station S1，mWithout the corresponding core network functionality it will connect to the nearest available gateway station GW 3.
The embodiment of the invention also provides a computer readable storage medium, and the computer readable storage medium stores a computer program for executing the using method of the low-orbit satellite communication system.
For specific implementation, reference may be made to the specific implementation of the method for using the low-earth-orbit satellite communication system.
In summary, in the technical solution provided by the embodiment of the present invention, satellite communication is performed based on a mobile gateway station placed on a satellite. Specifically, the method comprises the following steps:
the satellite constellation comprises a communication satellite and a mobile gateway station; the communication satellite mainly has a transparent forwarding function; the mobile gateway station is responsible for the processes of user access, signal processing and the like, and plays a role of the gateway station.
The gateway station is composed of an access network, a core network, a network management and operation unit, etc., and can be divided into 3 basic types according to the functions: access mobile gateway stations, integrated mobile gateway stations or virtual mobile gateway stations.
An inter-satellite link is configured between the communication satellite and the mobile gateway station, and the communication satellite selects the mobile gateway station closest to the communication satellite to connect when connecting with the mobile gateway station.
Without a ground gateway station, the system relies entirely on a mobile gateway station for communication.
The user is within the coverage area of a communication satellite and the communication process includes a user link between the user and the communication satellite and a feeder link between the communication satellite and a mobile gateway station.
The user is in the coverage area of the mobile gateway station and the communication process only comprises the user and the user link of the mobile gateway station.
The communication satellite may act as a relay to connect the communication satellite to the mobile gateway station if there is an inter-satellite link between the communication satellite and the communication satellite.
In the case of a ground gateway station, the system relies on both the ground gateway station and the mobile gateway station to communicate.
The user is within the coverage area of a communication satellite having connectable ground gateway stations, and the communication process includes a user link between the user and the communication satellite and a feeder link between the communication satellite and the ground gateway stations.
The communication satellite, which has no connectable terrestrial gateway stations but is instead replaced by a mobile gateway station, is within the coverage area of the communication satellite, and the communication process comprises a user link between the user and the communication satellite and a feeder link between the communication satellite and the mobile gateway station.
The user is in the coverage area of the mobile gateway station and the communication process only comprises the user and the user link of the mobile gateway station.
If there is no corresponding core network functionality on the mobile gateway station, the mobile gateway station needs to connect to a ground gateway station having a core network.
If the inter-satellite link exists universally between any satellites, the communication satellite can be used as a relay to connect the communication satellite and the mobile gateway station, and the mobile gateway station without the corresponding core network function can also be connected to the mobile gateway station with the core network function.
It can be seen that the existing low-orbit constellation completely depends on the ground gateway station to work, however, when the ground gateway station is damaged, the global coverage is discontinuous and the communication is interrupted.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (16)
1. A mobile gateway station, located at a satellite, comprising: an access network unit and a core network unit, where the core network unit includes a user plane UP and a control plane CP, or the core network unit includes a CP, where:
an access network unit for transceiving data with a communication satellite;
and the core network unit is used for carrying out core network processing and routing on the data received and transmitted by the access network unit.
2. The gateway station of claim 1, wherein the access network element is further for transceiving data with the user terminal.
3. The gateway station of claim 1, wherein the access network element transceives data according to a release above 5G.
4. A gateway station according to claim 1, characterized in that the access network unit comprises a distribution unit DU and/or a concentration unit CU.
5. A mobile gateway station, located at a satellite, comprising:
a processor for reading the program in the memory, performing the following processes:
receiving and transmitting data with a communication satellite;
processing and routing the received and transmitted data by a core network;
a transceiver for receiving and transmitting data under the control of the processor;
the processor is configured to perform an UP function and a CP function, or the processor is configured to perform a CP function.
6. A communication satellite, comprising:
the terminal transceiving module is used for transceiving data with a user terminal through a user link;
a determination module for determining whether a feeder link can be established with a ground gateway station, determining whether a connection can be established with a mobile gateway station according to claim 1 or 5;
the receiving and sending module is used for determining that a feed link cannot be established with the ground gateway station when the receiving and sending module receives and sends data with the user terminal, and receiving and sending data with the mobile gateway station when the receiving and sending module establishes connection with the mobile gateway station; when the feeder link can not be established with the ground gateway station and the connection can not be established with the mobile gateway station, the data is transmitted and received with other communication satellites in a relay mode.
7. The satellite of claim 6, wherein the determining module is further configured to determine whether a feeder link can be established with a terrestrial gateway station, determine whether a connection can be established with a mobile gateway station as claimed in claim 1 or 5, based on one or a combination of the following:
network pre-configuration, network control and communication satellite judgment.
8. The satellite of claim 6, further comprising:
and the target judgment module is used for determining a target mobile gateway station and/or a target communication satellite for data transceiving for the transceiving module according to a preset strategy.
9. A communication satellite, comprising:
a processor for reading the program in the memory, performing the following processes:
receiving and transmitting data with a user terminal through a user link;
determining whether a feeder link can be established with a ground gateway station, determining whether a connection can be established with a mobile gateway station according to claim 1 or 5;
when receiving and transmitting data with a user terminal, determining that a feed link cannot be established with a ground gateway station, and when establishing connection with a mobile gateway station, performing data receiving and transmitting with the mobile gateway station; when determining that the feeder link cannot be established with the ground gateway station and the connection cannot be established with the mobile gateway station, carrying out data transceiving with other communication satellites in a relay mode;
a transceiver for receiving and transmitting data under the control of the processor.
10. A low earth orbit satellite communication system, comprising: the mobile gateway station of claim 1 or 5 and the communication satellite of claim 6 or 9, wherein:
the mobile gateway station is used for receiving and transmitting data with the communication satellite, and performing core network processing and routing on the received and transmitted data;
a communications satellite for:
receiving and transmitting data with a user terminal through a user link;
determining whether a feeder link can be established with a ground gateway station, and determining whether a connection can be established with the mobile gateway station;
when receiving and transmitting data with a user terminal, determining that a feeder link cannot be established with a ground gateway station, and when establishing connection with a mobile gateway station, performing data receiving and transmitting with the mobile gateway station; when the feeder link can not be established with the ground gateway station and the connection can not be established with the mobile gateway station, the data is transmitted and received with other communication satellites in a relay mode.
11. The system of claim 10, further comprising:
and the ground gateway station is used for processing and routing data transmitted and received by the communication satellite through the feeder link.
12. The system of claim 10, wherein the mobile gateway station is further for transceiving data with the user terminal over a user link; and/or the presence of a gas in the atmosphere,
the communication satellite is further used for relaying data transmitted by other communication satellites.
13. A method of using the low earth orbit satellite communication system of claim 10, comprising:
the communication satellite receives data sent by a user terminal through a user link;
the communication satellite transmits the received data to the mobile gateway station;
the mobile gateway station carries out core network processing and routing on data sent by the communication satellite;
and/or the presence of a gas in the atmosphere,
the mobile gateway station performs core network processing and routing, and sends data to the terminal to the communication satellite;
a communication satellite receives data sent to a terminal;
the communication satellite transmits data destined for the terminal to the user terminal over the user link.
14. The method of claim 13, further comprising:
and the communication satellite determines a target for receiving data from the mobile gateway station, the ground gateway station or the communication satellite according to a preset strategy and then sends the data sent by the user terminal, wherein the preset strategy is pre-configured by a network, controlled by the network or judged by the communication satellite.
15. The method of claim 13, further comprising:
after receiving data sent by other communication satellites, the communication satellite determines a target for receiving the data from a mobile gateway station, a ground gateway station or the communication satellite according to a preset strategy, and then sends the data sent by other communication satellites, wherein the preset strategy is pre-configured by a network, controlled by the network or judged by the communication satellite.
16. A computer-readable storage medium, characterized in that it stores a computer program for performing the method of any of claims 13 to 15.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010106715.0A CN113300751B (en) | 2020-02-21 | 2020-02-21 | Mobile gateway station, communication satellite, low-orbit satellite communication system and using method |
| PCT/CN2020/133859 WO2021164374A1 (en) | 2020-02-21 | 2020-12-04 | Mobile gateway station, communication satellite, low-orbit satellite communication system and using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010106715.0A CN113300751B (en) | 2020-02-21 | 2020-02-21 | Mobile gateway station, communication satellite, low-orbit satellite communication system and using method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113300751A CN113300751A (en) | 2021-08-24 |
| CN113300751B true CN113300751B (en) | 2022-07-22 |
Family
ID=77317489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010106715.0A Active CN113300751B (en) | 2020-02-21 | 2020-02-21 | Mobile gateway station, communication satellite, low-orbit satellite communication system and using method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113300751B (en) |
| WO (1) | WO2021164374A1 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116073881A (en) * | 2021-11-03 | 2023-05-05 | 大唐移动通信设备有限公司 | Data transmission method, satellite base station, gateway station and storage medium |
| CN114040517A (en) * | 2021-11-11 | 2022-02-11 | 中国电子科技集团公司第五十四研究所 | Low-orbit satellite internet network architecture compatible with 5G |
| CN113853024B (en) * | 2021-11-29 | 2022-03-04 | 中国星网网络系统研究院有限公司 | Data transmission method, system, device and storage medium |
| CN114389676B (en) * | 2022-01-04 | 2023-08-11 | 上海邮电设计咨询研究院有限公司 | Satellite interconnection cluster network communication system and communication method |
| CN114915991B (en) * | 2022-05-11 | 2022-12-09 | 军事科学院系统工程研究院网络信息研究所 | Multi-satellite multi-gateway satellite mobile communication system load balancing method |
| CN114900226A (en) * | 2022-05-16 | 2022-08-12 | 中电防务科技有限公司 | Low-earth-orbit constellation satellite communication system and communication method thereof |
| CN115209446B (en) * | 2022-06-13 | 2023-07-25 | 爱浦路网络技术(北京)有限公司 | Core network cloud service communication method, system, device and medium based on satellite |
| CN115085799B (en) * | 2022-06-25 | 2024-03-22 | 平安银行股份有限公司 | Communication method, related device, storage medium |
| CN117641272A (en) * | 2022-08-18 | 2024-03-01 | 中国电信股份有限公司 | Method and system for storing and forwarding user plane data |
| CN115842580A (en) * | 2022-11-10 | 2023-03-24 | 中国人民解放军军事科学院国防科技创新研究院 | Low-orbit satellite-based heaven-earth integrated Internet of things construction method |
| CN115801107B (en) * | 2023-01-30 | 2023-04-28 | 中国电子科技集团公司第五十四研究所 | Intercommunication method for software-defined heaven-earth dual-bearing network and heterogeneous access network |
| CN116388840B (en) * | 2023-03-21 | 2023-10-03 | 广州爱浦路网络技术有限公司 | Satellite and ground communication split access method and device of user terminal and storage medium |
| CN116545498B (en) * | 2023-04-14 | 2023-11-07 | 北京和德宇航技术有限公司 | Satellite data acquisition system, method, equipment and storage medium |
| CN116567754B (en) * | 2023-07-06 | 2023-10-03 | 中国电信股份有限公司 | Switching method, system, device, equipment and storage medium |
| CN117424638B (en) * | 2023-12-18 | 2024-02-20 | 银河航天(北京)网络技术有限公司 | Network slice management method, device and storage medium based on satellite-ground fusion |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107592152A (en) * | 2016-07-06 | 2018-01-16 | 北京信威通信技术股份有限公司 | A kind of constellation satellite system, communication means and system based on constellation satellite system |
| CN109039434A (en) * | 2018-09-13 | 2018-12-18 | 上海微小卫星工程中心 | A method of it is communicated for safe satellite |
| WO2020009630A1 (en) * | 2018-07-06 | 2020-01-09 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and devices for connecting a wireless communication device to a user plane in a wireless communication network |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100559737C (en) * | 2007-03-16 | 2009-11-11 | 北京航空航天大学 | Space-based mobile communication system and communication means |
| US9369198B2 (en) * | 2014-03-28 | 2016-06-14 | Google Inc. | Global communication network |
| FR3030992B1 (en) * | 2014-12-23 | 2016-12-23 | Thales Sa | DATA TRANSMISSION SYSTEM AND METHOD USING JOINTLY TERRESTRIAL BOND AND SATELLITE LINK |
| US10103812B2 (en) * | 2016-01-27 | 2018-10-16 | The Boeing Company | Satellite communication system |
| US10321503B2 (en) * | 2016-12-11 | 2019-06-11 | Motorola Mobility Llc | Method and apparatus for attaching a remote unit to a mobile core network via a standalone untrusted non-3GPP access network |
| CN108574581A (en) * | 2017-03-07 | 2018-09-25 | 北京空间技术研制试验中心 | Incorporate network environment ground artificial system |
| CN110391983B (en) * | 2019-07-05 | 2021-08-03 | 中国人民解放军国防科技大学 | Distributed congestion avoidance routing algorithm for satellite-ground integrated network |
-
2020
- 2020-02-21 CN CN202010106715.0A patent/CN113300751B/en active Active
- 2020-12-04 WO PCT/CN2020/133859 patent/WO2021164374A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107592152A (en) * | 2016-07-06 | 2018-01-16 | 北京信威通信技术股份有限公司 | A kind of constellation satellite system, communication means and system based on constellation satellite system |
| WO2020009630A1 (en) * | 2018-07-06 | 2020-01-09 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and devices for connecting a wireless communication device to a user plane in a wireless communication network |
| CN109039434A (en) * | 2018-09-13 | 2018-12-18 | 上海微小卫星工程中心 | A method of it is communicated for safe satellite |
Non-Patent Citations (3)
| Title |
|---|
| "R2-1910698 Discussion on feeder link switch for regenerative amp * |
| S2-1907180 "FS 5GSAT ARCH: Evaluation and Conclusion for KI#2 and KI#6";THALES等;《3GPP tsg_sa\wg2_arch》;20190618;第7节 * |
| transparent NTN LEO scenarios".《3GPP tsg_ran\wg2_rl2》.2019,第3节. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113300751A (en) | 2021-08-24 |
| WO2021164374A1 (en) | 2021-08-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113300751B (en) | Mobile gateway station, communication satellite, low-orbit satellite communication system and using method | |
| US11463152B2 (en) | Moving cellular communication system | |
| CN101877860B (en) | The transmission method of via node, gateway, relay data and system | |
| EP1890443B1 (en) | System and method for implementing a multi-radio wireless relay network | |
| US5999797A (en) | Method and apparatus for providing private global networks in a satellite communication system | |
| CN112019255B (en) | Transparent and processing mixed low-orbit inter-satellite networking communication system and method | |
| CN111182583B (en) | Task delay constraint-oriented low-orbit satellite data transmission method | |
| JP7398456B2 (en) | Establishing and establishing links and electronic devices | |
| CN103391130A (en) | Method and devices for achieving on-board switching in satellite mobile communication system | |
| CN114785399B (en) | End-to-end communication method of low-orbit satellite communication network system | |
| US20070064638A1 (en) | Radio access system with extended service coverage | |
| CN115173933A (en) | Satellite data processing method and device | |
| CN113853024B (en) | Data transmission method, system, device and storage medium | |
| EP1411739A1 (en) | A method of selecting cells of base stations for soft-handover connection, and a network for mobile telecommunications | |
| CA2274334A1 (en) | Satellite communication system providing multi-gateway diversity to a mobile user terminal | |
| US5960324A (en) | Method for unobtrusive interception of satellite communication | |
| CN114866373B (en) | Fusion gateway for interfacing with a base station via a satellite communication link | |
| CN112968973A (en) | Non-ground network communication system and method | |
| CN116760453B (en) | Method, device, system and related equipment for switching interfaces between co-orbit low-orbit satellites | |
| KR101273075B1 (en) | Communication system using cooperative multicast based on selective relay and method thereof | |
| CN114884556A (en) | Ground communication method based on satellite network | |
| CN117498927A (en) | Network service function deployment method and device for space-based network | |
| CN115189757A (en) | Route planning method and device of constellation communication system | |
| JP3644393B2 (en) | User station direct connection method, user station direct connection system, and satellite station | |
| CN117768928A (en) | Main station and standby station switching method for satellite mobile communication system emergency communication mode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |