CN113038618A - Satellite communication system and method for accessing satellite communication system - Google Patents
Satellite communication system and method for accessing satellite communication system Download PDFInfo
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- 238000004891 communication Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000011664 signaling Effects 0.000 claims abstract description 85
- 238000007726 management method Methods 0.000 claims description 13
- 238000013468 resource allocation Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 230000003993 interaction Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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Abstract
The application provides a satellite communication system and a satellite communication system access method, and relates to the technical field of satellite communication. A method of satellite communication system access, comprising: a satellite load signaling processing unit sends a first broadcast message to a coverage cell through a signaling beam, wherein the first broadcast message comprises an ephemeris message; the satellite terminal adjusts the beam direction according to the first broadcast message and reports the cell ID of the serving cell; the satellite load signaling processing unit schedules a service beam to cover the service cell according to the cell ID; and the satellite terminal is accessed to the satellite communication system through the signaling of the associated control channel of the service beam. According to the technical scheme of the embodiment of the application, the signaling beam and the service beam are independently designed, and the problems of ephemeris synchronization and multi-user management in the random access process of the satellite terminal are solved through the signaling content interaction of the broadcast channel and the service beam associated control channel.
Description
Technical Field
The present invention relates to the field of satellite communication technologies, and in particular, to a satellite communication system and a method for accessing the satellite communication system.
Background
The traditional satellite communication system mostly adopts a working mode of resource pre-allocation to provide point-to-point data transmission service for users, and cannot support random access of massive users and flexible and dynamic on-satellite resource allocation as required. The DVB-S2X standard provides physical layer and MAC layer protocols but lacks multi-user management higher layer protocols. The 5G NR technology provides an access and multi-user management solution for a ground mobile communication user, and cannot well support the access and multi-user management of a low-orbit satellite internet user.
Disclosure of Invention
Based on the satellite communication system and the satellite communication system access method, the satellite communication system and the satellite communication system access method can be used for initial random access and multi-user management of the low-orbit satellite internet terminal.
According to an aspect of the present application, there is provided a method for satellite communication system access, including: a satellite load signaling processing unit sends a first broadcast message to a coverage cell through a signaling beam, wherein the first broadcast message comprises an ephemeris message; the satellite terminal adjusts the beam direction according to the first broadcast message and reports the cell ID of the serving cell; the satellite load signaling processing unit schedules a service beam to cover the service cell according to the cell ID; and the satellite terminal is accessed to the satellite communication system through the signaling of the associated control channel of the service beam.
According to some embodiments, the aforementioned method further comprises: the service cell is divided according to geographical regions, the position is fixed, and the satellite terminal in the service cell provides service transmission broadband service by the service satellite of the service cell at the current moment.
According to some embodiments, the scheduling, by the satellite payload signaling processing unit, a service beam to cover the serving cell according to the cell ID includes: the satellite load signaling processing unit sends a second broadcast message and a system message for the serving cell.
According to some embodiments, the satellite terminal accesses the satellite communication system through signaling of the associated control channel of the service beam, including: the satellite terminal initiates an access application; and Radio Resource Control (RRC) connection is established between the satellite terminal and the satellite load signaling processing unit.
According to some embodiments, after the satellite terminal initiates an access application, the method further includes: the satellite load signaling processing unit sends a first broadcast message including the satellite ephemeris through a signaling beam after receiving the application; and the satellite terminal reports the cell ID.
According to some embodiments, after establishing the RRC connection between the satellite terminal and the satellite load signaling processing unit, the method further comprises: the satellite load signaling processing unit interacts with a core network to initialize the information of the satellite terminal; and the core network carries out authentication on the terminal.
According to some embodiments, after the core network authenticates the terminal, the method further includes: the core network initiates an initial context establishment request to the satellite load signaling processing unit; the satellite load signaling processing unit carries out capability query and resource allocation on the satellite terminal; the satellite load signaling processing unit responds to the initial context establishment request of the core network, so that the access registration of the satellite terminal in the core network is completed; and the satellite terminal receives the access permission of the core network, switches to a service plane, and establishes a bearer with the core network so as to transmit and receive data packets.
According to some embodiments, the satellite terminal accesses the satellite communication system through signaling of the associated control channel of the service beam, further comprising: the satellite terminal applies for resources to the satellite load signaling processing unit; and the satellite load signaling processing unit allocates beam resources to a service cell where the satellite terminal is located according to a satellite multi-user management strategy, wherein the beam resources comprise the direction, power and bandwidth of the service beam.
According to some embodiments, the satellite terminal accesses the satellite communication system through signaling of the associated control channel of the service beam, further comprising: and the satellite load signaling processing unit simultaneously allocates the wireless resources in the service beam to the satellite terminals in the cell, wherein the wireless resources in the service beam comprise time domain resources and/or frequency domain resources.
According to an aspect of the present application, there is provided a satellite communication system including: the satellite communication system adopts a scheme of independent design of signaling beams and service beams, and performs satellite terminal access and multi-user management based on the signaling beams and the service beams; the signaling wave beam realizes wide-area static coverage and sends synchronous broadcast messages including ephemeris; and the service beam receives and transmits system broadcast messages and control signaling along with the channel.
According to the embodiment, the random access of the satellite terminal can be realized by independently designing the signaling beam and the service beam and interacting the signaling contents of the broadcast channel and the service beam associated control channel.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without exceeding the protection scope of the present application.
Fig. 1 shows a schematic diagram of a satellite communication system according to an example embodiment of the present application.
Fig. 2 shows a flow chart of a satellite communication system access method according to an example embodiment of the present application.
Fig. 3 shows a signaling interaction diagram of a satellite communication system access method according to an example embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other means, components, materials, devices, or the like. In such cases, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The traditional satellite communication system is based on DVB series standards, is suitable for a single-satellite communication system, is not suitable for a constellation communication system, cannot support random access of massive users, and lacks a multi-user management high-level protocol. The current 3GPP Release 16 standard is applicable to a ground mobile communication system and cannot be directly applied to a low-orbit satellite Internet constellation system. The application provides a satellite communication system and a satellite communication system access method, wherein a signaling beam and a service beam are independently designed, and the signaling content interaction of a broadcast channel and a service beam associated control channel is adopted, so that the satellite communication system is suitable for initial random access of a low-orbit satellite Internet terminal. In addition, multi-user management can also be achieved.
A satellite communication system and a satellite communication system access method according to an embodiment of the present application will be described in detail below with reference to the accompanying drawings.
Description of terms:
coverage area: generally refers to the area of the ground covered by the satellite signals.
A serving cell: refers to the administrative domain served by the satellite broadcast service.
Wave beam: refers to a shape formed on the surface of the earth by electromagnetic waves emitted from a satellite antenna.
A wave beam area: refers to the area given by the intersection of the half-power beam of the satellite transmitting antenna with the ground. In general, it almost coincides with the footprint.
Wave position: generally refers to the position of the beam covered at some angle in azimuth or elevation.
Operation and control center: the satellite navigation hub is used for commanding the satellite to work, sending various instructions to the satellite, arranging satellite working programs, controlling the satellite operation attitude, commanding the sensor to work and transmitting information, controlling the work cooperation of a satellite-borne instrument and a ground receiving station and the like.
Fig. 1 shows a schematic diagram of a satellite communication system according to an example embodiment of the present application.
As shown in fig. 1, a satellite communication system according to an exemplary embodiment of the present application is composed of two relatively independent architectures, an access network 101 and a bearer network 102.
The access network 101 is composed of a satellite terminal 103, a wave position 104, and the like.
The carrier network 102 is composed of satellites 105, operation and control centers 106 and the like.
Service cells are divided according to geographical areas, correspond to the wave position 104, and have fixed positions, and the satellite terminal 103 in the service cell provides service transmission broadband service by the satellite 105 in the service cell at the current moment.
When the satellites 105 are connected by the inter-satellite link 107, messages are transmitted and received through the inter-satellite link.
When there is no inter-satellite link 107 between the satellites 105, they may be connected via feeder links 108 and relay messages through gateway stations (core networks).
Fig. 2 shows a flow chart of a satellite communication system access method according to an example embodiment of the present application.
As shown in fig. 2, the satellite transmits a first broadcast message through a signaling beam at S201.
According to an exemplary embodiment, the satellite transceives and processes information through a payload signaling processing unit; the satellite sending broadcast message range is the satellite signaling coverage area at the current moment and comprises a service cell where a satellite terminal is located; the first broadcast message comprises an ephemeris message.
In S202, the satellite terminal adjusts the beam direction according to the first broadcast message, and reports the cell ID of the serving cell in which the satellite terminal is located.
According to an example embodiment, the satellite terminal adjusts beam pointing to track the satellite; and the satellite terminal reports the cell ID of the service cell through a signaling beam.
At S203, the satellite load signaling processing unit schedules a service beam to cover the serving cell according to the cell ID.
According to an exemplary embodiment, the service beam and the signaling beam are independent from each other, and the serving cell broadcast message and the system message are transmitted and received along the path through the service beam.
At S204, the satellite terminal accesses the satellite communication system through the signaling of the associated control channel of the service beam.
According to some embodiments, the request for access to the satellite communication system is initiated by the satellite terminal, and the RRC connection is established between the satellite terminal and the satellite according to a simplified access procedure.
For example, the simplified access procedure includes: after the satellite terminal initiates an access application, the satellite load signaling processing unit receives the application and sends a first broadcast message through the signaling beam; and the satellite terminal reports the cell ID through the signaling beam according to the first broadcast message.
According to some embodiments, during the access process, the satellite load signaling processing unit interacts with a gateway station (core network) to authenticate the satellite terminal; the satellite terminal provides a resource application, and the satellite load signaling processing unit allocates the service beam resource to a service cell where the satellite terminal is located according to a satellite multi-user management strategy and allocates wireless resources in the service beam to each satellite terminal in the cell.
According to some embodiments, the satellite terminal receives the access permission of the gateway station (core network), switches to a service plane, and establishes a bearer with the gateway station (core network) so as to transmit and receive data packets.
Fig. 3 shows a signaling interaction diagram of a satellite communication system access method according to an example embodiment of the present application.
As shown in fig. 3, at S301, a satellite transmits a first broadcast message including an ephemeris message to a coverage cell through a signaling beam.
In S302, the satellite terminal synchronizes with the satellite ephemeris, adjusts the beam pointing direction according to the first broadcast message, sends service request information to the satellite, and reports the ID of the serving cell where the satellite terminal is located.
The foregoing steps S301 and S302 are completed by a signaling beam.
In S303, the satellite schedules a service beam to cover the serving cell where the satellite terminal is located according to the serving cell position reported by the satellite terminal.
According to some embodiments, the satellite transmits a second broadcast message to the serving cell via the service beam.
At S304, after receiving the second broadcast message, the satellite terminal sends a system message acquisition request to the satellite.
At S305, the satellite transmits a system message to the satellite terminal via the service beam associated channel.
At S306, the satellite terminal sends a request for access to the system to the satellite and requests to establish an RRC connection.
According to some embodiments, after the satellite terminal initiates an access application, the satellite payload signaling processing unit receives the application, and transmits a first broadcast message including the satellite ephemeris through the signaling beam. And the satellite terminal reports the cell ID through the signaling beam according to the first broadcast message.
In S307, the satellite load signaling processing unit processes the request of the satellite terminal to access the system, and issues information through the service beam.
At S308, the RRC connection establishment is completed, and the satellite terminal sends a network registration request to the satellite.
In S309, the satellite load signaling processing unit initializes the request information transmitted by the satellite terminal, and pushes the request information to the gateway station (core network).
At S310, the gateway station (core network) receives the information transmitted by the satellite, performs authentication on the satellite terminal, and confirms the security of the connection.
At S311, the gateway station (core network) sends an initial context setup request to the satellite.
At S312, the satellite interacts information with the satellite terminal.
According to some embodiments, the satellite load signaling processing unit queries the capability of the satellite terminal, and the satellite terminal applies for resources from the satellite load signaling processing unit. And the satellite load signaling processing unit allocates the service beam resource to a service cell in which the satellite terminal is located according to a satellite multi-user management strategy and allocates wireless resources in the service beam to each satellite terminal in the cell.
At S313, the satellite payload signaling processing unit responds to the initial context setup request of the gateway station (core network), thereby completing the access registration of the satellite terminal at the gateway station (core network).
At S314, the satellite terminal receives the access permission of the gateway station (core network), switches to the service plane, and establishes a bearer with the gateway station (core network) to perform data packet transmission and reception.
The foregoing steps S303 to S314 are mainly completed by the service beam.
According to some embodiments of the application, a method based on signaling beam and service beam independent design and signaling content interaction of a broadcast channel and a service beam associated control channel is adopted, and lightweight and adaptive improvement is performed on the 3GPP Release 16 standard, so that the problems of terminal access and multi-user management based on user delay constraint under the conditions of satellite power limitation and high dynamic are solved, and an access networking solution is provided for deep fusion of a satellite access network and a 5G ground system network from the perspective of protocol system design.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the description of the embodiments is only intended to facilitate the understanding of the methods and their core concepts of the present application. Meanwhile, a person skilled in the art should, according to the idea of the present application, change or modify the embodiments and applications of the present application based on the scope of the present application. In view of the above, the description should not be taken as limiting the application.
Claims (10)
1. A method for satellite communication system access, comprising:
a satellite load signaling processing unit sends a first broadcast message to a coverage cell through a signaling beam, wherein the first broadcast message comprises an ephemeris message;
the satellite terminal adjusts the beam direction according to the first broadcast message and reports the cell ID of the serving cell;
the satellite load signaling processing unit schedules a service beam to cover the service cell according to the cell ID;
and the satellite terminal is accessed to the satellite communication system through the signaling of the associated control channel of the service beam.
2. The method of claim 1, wherein the serving cell is divided into geographical areas and fixed in position, and the satellite terminals in the serving cell are served by the serving satellite of the serving cell at the current time to transmit broadband service.
3. The method of claim 1, wherein said satellite payload signaling processing unit schedules a service beam to cover said serving cell based on said cell ID, comprising:
the satellite load signaling processing unit sends a second broadcast message and a system message for the serving cell.
4. The method of claim 1, wherein the satellite terminal accessing the satellite communication system via signaling of the associated control channel of the service beam, comprises:
the satellite terminal initiates an access application;
and Radio Resource Control (RRC) connection is established between the satellite terminal and the satellite load signaling processing unit.
5. The method of claim 4, wherein after the satellite terminal initiates the access application, further comprising:
the satellite load signaling processing unit receives the application and sends a first broadcast message including the satellite ephemeris through a signaling beam;
and the satellite terminal reports the cell ID.
6. The method of claim 4, wherein after establishing a Radio Resource Control (RRC) connection between the satellite terminal and the satellite payload signaling processing unit, further comprising:
the satellite load signaling processing unit interacts with a core network to initialize the information of the satellite terminal;
and the core network carries out authentication on the terminal.
7. The method of claim 6, wherein after the core network authenticates the terminal, the method further comprises:
the core network initiates an initial context establishment request to the satellite load signaling processing unit;
the satellite load signaling processing unit carries out capability query and resource allocation on the satellite terminal;
the satellite load signaling processing unit responds to the initial context establishment request of the core network, so that the access registration of the satellite terminal in the core network is completed;
and the satellite terminal receives the access permission of the core network, switches to a service plane, and establishes a bearer with the core network so as to transmit and receive data packets.
8. The method of claim 4, wherein the satellite terminal accesses the satellite communication system via signaling of an associated control channel of the service beam, further comprising:
the satellite terminal applies for resources to the satellite load signaling processing unit;
and the satellite load signaling processing unit allocates beam resources to a service cell where the satellite terminal is located according to a satellite multi-user management strategy, wherein the beam resources comprise the direction, power and bandwidth of the service beam.
9. The method of claim 4, wherein the satellite terminal accesses the satellite communication system via signaling of an associated control channel of the service beam, further comprising:
and the satellite load signaling processing unit simultaneously allocates the wireless resources in the service beam to the satellite terminals in the cell, wherein the wireless resources in the service beam comprise time domain resources and/or frequency domain resources.
10. A satellite communication system, characterized in that,
the satellite communication system adopts a scheme of independent design of signaling beams and service beams, and performs satellite terminal access and multi-user management based on the signaling beams and the service beams;
the signaling wave beam realizes wide-area static coverage and sends synchronous broadcast messages including ephemeris;
and the service beam receives and transmits system broadcast messages and control signaling along with the channel.
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| CN114158056A (en) * | 2021-11-25 | 2022-03-08 | 中国电子科技集团公司第五十四研究所 | Quick access method for low-orbit constellation system |
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| WO2024045925A1 (en) * | 2022-08-31 | 2024-03-07 | 华为技术有限公司 | Satellite communication method and apparatus |
| CN115189757A (en) * | 2022-09-07 | 2022-10-14 | 银河航天(北京)网络技术有限公司 | Route planning method and device of constellation communication system |
| CN116015411A (en) * | 2022-12-16 | 2023-04-25 | 中电防务科技有限公司 | High dynamic terminal and switching method for satellite mobile communication system |
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