CN111866878B - Terminal login method in satellite communication system - Google Patents
Terminal login method in satellite communication system Download PDFInfo
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- CN111866878B CN111866878B CN202010694297.1A CN202010694297A CN111866878B CN 111866878 B CN111866878 B CN 111866878B CN 202010694297 A CN202010694297 A CN 202010694297A CN 111866878 B CN111866878 B CN 111866878B
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- 238000004891 communication Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000004044 response Effects 0.000 claims abstract description 37
- 230000008569 process Effects 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims description 28
- 238000005259 measurement Methods 0.000 claims description 25
- 238000012937 correction Methods 0.000 claims description 6
- 230000011664 signaling Effects 0.000 description 5
- 230000002860 competitive effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/06—Authentication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/0876—Network architectures or network communication protocols for network security for authentication of entities based on the identity of the terminal or configuration, e.g. MAC address, hardware or software configuration or device fingerprint
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
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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
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
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Abstract
The invention provides a terminal login method in a satellite communication system, which comprises the following steps: the terminal receives the broadcast message of the high orbit satellite and sends a login request to the high orbit satellite; the high orbit satellite receives the login request and sends a login request response to the terminal, and the terminal receives the login request response and designates the low orbit satellite serving by the terminal based on the login request or the login request response in the process; the terminal establishes a connection with the designated low earth orbit satellite. According to the terminal login method in the satellite communication system, the terminal initiates a login process to the high-orbit satellite, and the high-orbit satellite assists the terminal to be connected to the low-orbit satellite, so that efficient terminal login is realized, the influence of high mobility of the low-orbit satellite on initial access of the terminal is overcome, and the success rate of connection establishment between the terminal and the low-orbit satellite is improved.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a terminal login method in a satellite communication system.
Background
With the continuous development of satellites and communication technologies, jointly building a satellite communication system by using satellites on multi-layer orbits becomes an important means for realizing global mobile network coverage. Satellites in different orbits have different states of motion, coverage and transmission characteristics. The high-orbit satellite is positioned on a geosynchronous orbit of 35786km, is kept relatively static with the ground, has a large coverage area, and limits the transmission speed due to a long transmission path. The orbit height of the low-orbit satellite is usually about 300-.
When logging in a satellite communication system, a satellite terminal first needs to receive broadcast messages sent by a satellite to realize downlink synchronization and obtain necessary information required by an access system. And then the terminal sends a login request to the selected service satellite and receives a corresponding login request response so as to realize login authentication of the terminal and obtain the required resource configuration. However, when the terminal initiates the above login procedure to the low earth orbit satellite, the login request of the terminal may be difficult to be accurately received due to the problems of high frequency offset, high time offset, difficult antenna alignment, and the like caused by the high mobility of the low earth orbit satellite, thereby hindering the subsequent data transmission process.
Therefore, a terminal login method in a satellite communication system is needed to improve the success rate of establishing a connection between a terminal and a low-earth orbit satellite.
Disclosure of Invention
The invention aims to provide a terminal login method in a satellite communication system, so as to realize efficient terminal login and improve the success rate of connection establishment between a terminal and a low-orbit satellite.
In order to achieve the above object, the present invention provides a terminal login method in a satellite communication system, wherein the applicable satellite communication system is a high-low orbit satellite combined network, and the satellite communication system comprises a terminal, a high orbit satellite and a low orbit satellite, and the terminal login method comprises:
step S1: the terminal receives the broadcast message of the high orbit satellite and sends a login request to the high orbit satellite;
step S2: the high orbit satellite receives the login request and sends a login request response to the terminal, and the terminal receives the login request response and designates the low orbit satellite serving by the terminal based on the login request or the login request response in the process;
step S3: the terminal establishes a connection with the designated low earth orbit satellite.
In the step S1, the broadcast message of the high earth orbit satellite includes a network clock reference, a network information table, a satellite position table and a login slot position;
and the terminal sends a login request to the high orbit satellite at the login time slot position, wherein the login request comprises a terminal ID and terminal capability information.
If the terminal has a positioning function, in step S1, the login request further includes terminal location information; in the step S2, the satellite communication system specifies a low-orbit satellite that the terminal provides service based on the terminal position information or both the terminal position information and the terminal capability information, and the registration request response includes information of the specified low-orbit satellite.
If the terminal does not have a positioning function, in step S1, the login request does not include terminal location information; in step S2, the login request response includes information of candidate low-orbit satellites capable of providing service for the terminal, and the terminal specifies the low-orbit satellite providing service for the terminal based on the information of the candidate low-orbit satellites in the login request response in the following manner:
step S21: the terminal measures the candidate low-orbit satellites based on the information of the candidate low-orbit satellites in the login request response and sends a measurement report to the high-orbit satellites;
step S22: the satellite communication system specifies a low-orbit satellite serving the terminal based on the measurement report, and the high-orbit satellite transmits a low-orbit satellite connection command to the terminal, the low-orbit satellite connection command containing information of the specified low-orbit satellite.
In step S2, the information of the candidate low-earth orbit satellite includes:
the IDs of a plurality of candidate low-orbit satellites, the frequencies used by the candidate low-orbit satellites and the reference signals; and beam IDs of a plurality of candidate low earth orbit satellites, frequencies used by the candidate beams, and reference signals; at least one of; and a transmission resource and a transmission configuration for sending the measurement report.
In step S21, the measurement of the candidate low-earth orbit satellite includes: receiving a corresponding reference signal at the frequency of each candidate low-earth satellite and/or beam to measure the strength of the reference signal of the corresponding low-earth satellite and/or beam;
in step S22, the measurement report includes one or more preferred low-earth orbit satellite IDs and measurement information thereof; and/or one or more preferred beam IDs and their measurement information.
In step S2, the information about the specified low-earth satellite includes: an ID of the designated low earth orbit satellite and/or a beam ID of the designated low earth orbit satellite, a control slot location assigned for the terminal, and a timing and frequency offset.
In step S3, the terminal establishes a connection with the specified low-earth orbit satellite in the following manner:
step S31: a terminal receives a broadcast message sent by a designated low-orbit satellite;
step S32: the terminal sends a control message to the low-orbit satellite at the position of the allocated control time slot by using the timing and frequency offset in the information of the designated low-orbit satellite;
step S33: and the low-earth orbit satellite feeds back a response message to the terminal.
In step S31, the broadcast message sent by the low earth orbit satellite includes the network clock reference and the satellite position table;
in the step S32, the control message includes a terminal ID, channel state information, and a power headroom;
in the step S33, the response message includes a connection success indication, transmission resources, transmission configuration, and a correction message.
According to the terminal login method in the satellite communication system, the terminal initiates the login process to the high orbit satellite through the terminal, and the high orbit satellite assists the terminal to be connected to the low orbit satellite, so that compared with the low orbit satellite moving at high speed, the terminal is synchronous with the high orbit satellite during initial login and the realization difficulty of completing the login process is lower, and efficient terminal login is realized. In addition, after the high-orbit satellite completes terminal authentication, the high-orbit satellite can provide low-orbit satellite information, timing and frequency offset for the terminal, and special transmission resources are allocated, so that the terminal can better compensate high frequency offset and time offset caused by high mobility of the low-orbit satellite after obtaining the information and the resources, the conflict problem caused by competitive access is avoided, and the success rate of establishing connection with the low-orbit satellite is obviously improved.
Drawings
Fig. 1 is a flowchart of a terminal registration method in a satellite communication system of the present invention.
Fig. 2 is a view showing a scenario of a satellite communication system to which the terminal registration method in the satellite communication system of the present invention is applied.
Fig. 3 is a signaling flowchart of a terminal registration method in a satellite communication system according to a first embodiment of the present invention.
Fig. 4 is a signaling flowchart of a terminal registration method in a satellite communication system according to a second embodiment of the present invention.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Fig. 2 shows a scenario of a satellite communication system to which the terminal login method in the satellite communication system of the present invention is applied, where the applied satellite communication system is a high-low orbit satellite joint networking, and the satellite communication system at least includes a terminal 1, a high-orbit satellite 2, and a low-orbit satellite 3. Data and control signaling are transmitted between the terminal 1 and the high orbit satellite 2 and between the terminal 1 and the low orbit satellite 3 through the user link 5. The satellite communication system also typically includes a terrestrial gateway station 4. The ground gateway station 4 has a data gateway function and is responsible for some or all of the control and management functions of the satellite communication system for providing the satellite with a feeder link 6 for data and control signaling, but the solution of the patent does not relate to the transmission on the feeder link, mainly for the signaling transmission on the user link between the terminal 1 and the satellite 2, 3. The low earth satellites 3, which move at high speed relative to the ground, may be connected to the gateway stations 4 by feeder links 6 or to the high earth satellites 2 by inter-satellite links 7. The high earth satellite 2 remains relatively stationary with respect to the ground and is connected to a gateway station 4 by a feeder link.
The first embodiment: terminal logging method in satellite communication system with terminal having positioning function
In the present embodiment, in the satellite communication system, the terminal has a positioning function.
As shown in fig. 1 and 3, the terminal registration method in the satellite communication system specifically includes the following steps:
step S1: the terminal 1 receives the broadcast message of the high earth satellite 2 and transmits a login request to the high earth satellite 2.
The broadcast message received by the terminal 1 includes, but is not limited to, a network clock reference, a network information table, a satellite location table, and a login slot location, etc. These broadcast messages are broadcast messages of the existing satellite communication system, the network clock reference is mainly used for clock synchronization of the terminal 1 at initial access, the network information table is used for acquiring satellite communication network information, and the satellite position table is used for antenna alignment.
The terminal 1 sends a registration request to the high earth orbit satellite 2 at the registration time slot position. The login request includes, but is not limited to, the terminal ID and the terminal capability information, and in addition, in this embodiment, the terminal has a positioning function, and then the login request further includes the terminal location information.
Step S2: the high orbit satellite 2 receives the login request and sends a login request response to the terminal 1, and the terminal 1 receives the login request response, in the process, the satellite communication system designates the low orbit satellite which provides service for the terminal 1 based on the login request or the login request response of the terminal 1;
in the present embodiment, since the terminal 1 has the positioning function, the terminal 1 transmits the registration request including the terminal position information, and therefore, the satellite communication system specifies the low-orbit satellite serving the terminal based on the terminal position information in the registration request including the information of the specified low-orbit satellite 3 serving the terminal 1 or both the terminal position information and the terminal capability information in the registration request.
The decision to specify a low-orbit satellite serving the terminal may be made by the satellite communication system, and may be made by a control function in the ground gateway station or a control function in the high-orbit satellite. The decision making process may use existing techniques, such as selecting the closest low-earth orbit satellite with the best channel quality based on the terminal location or measurement report.
The information for the designated low earth orbit satellite 3 includes, but is not limited to: the ID of the designated low earth orbit satellite 3 and/or the beam ID of the designated low earth orbit satellite 3, the control slot position allocated to the terminal 1, and the timing and frequency offsets, etc.
The low earth orbit satellite may generate a plurality of beams by using a beamforming technique, and the coverage, frequency band, bandwidth, and the like of each beam may be different. A low earth orbit satellite configured with a plurality of beams needs to provide services to a terminal through the beams generated by the low earth orbit satellite. The ID of the low earth orbit satellite 3 and the beam ID of the low earth orbit satellite 3 are used to inform the terminal of the beam in the low earth orbit satellite to be connected in step 3, the ID of the designated low earth orbit satellite 3 and/or the beam ID of the designated low earth orbit satellite 3, which indicates that at least the satellite ID needs to be decided, and the beam ID can be decided after the terminal is connected to the low earth orbit satellite. The control slot position is a resource allocated to the terminal 1 by the low earth orbit satellite 3 to transmit a control message, and is related to the terminal capability information, and the timing and frequency offsets are calculated based on the terminal position information.
Step S3: the terminal 1 establishes a connection with a designated low earth orbit satellite 3.
For a terminal with a positioning function, the terminal may establish a connection with a specified low-orbit satellite 3 based on the information of the specified low-orbit satellite 3 in the login request response in the following manner:
step S31: the terminal 1 receives the broadcast message sent by the appointed low-orbit satellite 3; the broadcast message transmitted by the low earth satellite 3 includes a network clock reference and a satellite position table, etc. The low earth satellite 3 broadcasts these broadcast messages periodically, and the terminal 1 searches the frequency band to find the ID of the specified low earth satellite 3 and/or the beam ID of the low earth satellite 3, so as to receive the corresponding broadcast message.
Step S32: the terminal 1 transmits a control message to the low earth orbit satellite 3 at the allocated control slot position using the timing and frequency offset in the information of the designated low earth orbit satellite 3; the control message includes a terminal ID, channel state information, power headroom, and the like. These control messages are used to determine the modulation coding, transmit power, etc. configuration for subsequent data transmissions.
Step S33: the low earth orbit satellite 3 feeds back a response message to the terminal 1; the response message includes a connection success indication, transmission resources, transmission configuration and correction messages, etc. The response messages are all configured for subsequent data transmission, the transmission resources are time-frequency resources configured for data transmission, the transmission configuration comprises configurations such as modulation coding and transmitting power, and the correction messages comprise timing, frequency, power correction and the like.
Thus, after the above-described connection process is completed, that is, after step S3 is completed, the terminal 1 can start data transmission with the low-earth satellite 3.
Second embodiment: terminal login method in satellite communication system with terminal without positioning function
As shown in fig. 1 and 4, the terminal login method in the satellite communication system specifically includes the following steps:
step S1: the terminal 1 receives the broadcast message of the high earth orbit satellite and transmits a login request to the high earth orbit satellite.
The broadcast message received by the terminal 1 includes a network clock reference, a network information table, a satellite position table, a login slot position, and the like.
And the terminal sends a login request to the high orbit satellite at the login time slot position, wherein the login request comprises but is not limited to a terminal ID and terminal capability information. In this embodiment, since the terminal does not have a positioning function, the login request does not include the terminal location information.
Step S2: the high-orbit satellite 2 receives the login request and transmits a login request response to the terminal 1, and the terminal 1 receives the login request response, in the process, a low-orbit satellite which the terminal 1 provides service is specified based on the login request response.
Since the registration request does not include the terminal position information in step S1, the satellite communication system cannot directly specify the low-orbit satellite 3 that the terminal provides service, and therefore, the registration request response includes information of the candidate low-orbit satellite 3 that can provide service to the terminal in step S2, and the terminal 1 specifies the low-orbit satellite 3 that the terminal 1 provides service based on the information of the candidate low-orbit satellite 3 in the registration request response.
The information of the candidate low-earth satellite 3 includes, but is not limited to:
the IDs of a plurality of candidate low-orbit satellites, the frequencies used by the candidate low-orbit satellites and the reference signals; and beam IDs of a plurality of candidate low earth orbit satellites, frequencies used by the candidate beams, and reference signals; at least one of; and transmission resources and transmission configurations for sending measurement reports.
In particular, if the satellite does not use beamforming techniques (i.e. there are no multiple beams), or a dedicated frequency band is used to cover the entire service area (which may be understood as a wide beam with a large coverage area, for broadcasting information, etc.), the satellite needs to transmit satellite-level reference signals at the used frequency points for the terminal to measure the signal strength of different satellites.
If the satellite is configured with multiple beams (possibly using different frequency bins), then beam-level reference signals need to be transmitted on each beam for the terminal to measure the signal strength of the different beams.
The frequency refers to a frequency point used by a satellite or a beam, and the reference signal is a known signal such as a pilot transmitted on the satellite or the beam and used for the terminal to measure the signal strength. The terminal needs to receive a reference signal at a frequency point of the satellite to measure the signal strength.
The terminal 1 specifies a low-orbit satellite serving the terminal 1 based on the information of the candidate low-orbit satellite in the login request response in the following manner:
step S21: the terminal 1 measures the candidate low-orbit satellite 3 based on the information of the candidate low-orbit satellite 3 in the login request response, and transmits a measurement report to the high-orbit satellite 2.
Since the information of the candidate low-earth satellite 3 includes the frequency and the reference signal used by the candidate low-earth satellite or the frequency and the reference signal used by the candidate beam, performing measurement on the candidate low-earth satellite 3 includes: and receiving the corresponding reference signal at the frequency of each candidate low-orbit satellite and/or beam to measure the strength of the reference signal of the corresponding low-orbit satellite and/or beam.
Accordingly, the measurement report includes the IDs of one or more preferred low earth orbit satellites 3 and their measurement information; and/or one or more preferred beam IDs and their measurement information. That is, at least the ID of the low-earth satellite 3 needs to be determined; the beam ID of the low earth satellite 3 may be specified at the same time or decided after the terminal 1 is connected to the low earth satellite 3. If the beam ID of the low earth satellite 3 needs to be specified at the same time, at least the beam ID and the measurement information are required, and the optimal beam is selected based on the measurement information of the beam, and the satellite that generates the beam is selected.
Step S22: the satellite communication system specifies a low-orbit satellite serving the terminal based on the measurement report, and the high-orbit satellite transmits a low-orbit satellite connection command containing information of the specified low-orbit satellite 3 to the terminal 1.
The decision to specify a low earth orbit satellite serving the terminal may be made by the satellite communication system, and in particular may be made by a control function in the ground gateway station or a control function in the high earth orbit satellite. The decision process may use existing techniques, such as selecting the beam of the low earth orbit satellite with the best channel quality based on the measurement report.
The information for the designated low earth orbit satellite 3 includes, but is not limited to: the ID of the designated low earth orbit satellite 3 and/or the beam ID of the designated low earth orbit satellite 3, the control slot position allocated to the terminal 1, and the timing and frequency offsets, etc.
Step S3: the terminal 1 establishes a connection with a designated low earth orbit satellite 3.
In the present embodiment, for the terminal 1 without the positioning function, the terminal 1 may establish a connection with the specified low-orbit satellite 3 based on the information of the specified low-orbit satellite 3 in the low-orbit satellite connection command in the following manner:
step S31: the terminal 1 receives the broadcast message sent by the appointed low-orbit satellite 3; the broadcast message transmitted by the low earth satellite 3 includes a network clock reference and a satellite position table, etc.
Step S32: the terminal 1 transmits a control message to the low earth orbit satellite 3 at the allocated control slot position using the timing and frequency offset in the information of the designated low earth orbit satellite 3; the control message includes a terminal ID, channel state information, power headroom, and the like.
Step S33: the low earth orbit satellite 3 feeds back a response message to the terminal 1; the response message includes a connection success indication, transmission resources, transmission configuration and correction messages, etc.
Therefore, after the connection process is completed, the terminal can start data transmission with the low-earth orbit satellite.
The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and various changes may be made in the above embodiments of the present invention. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application fall within the scope of the claims of the present patent application. The invention has not been described in detail in order to avoid obscuring the invention.
Claims (4)
1. A terminal login method in a satellite communication system is characterized in that the applicable satellite communication system is a high-low orbit satellite combined network, the satellite communication system comprises a terminal, a high orbit satellite and a low orbit satellite, and the terminal login method comprises the following steps:
step S1: the terminal receives the broadcast message of the high orbit satellite and sends a login request to the high orbit satellite;
step S2: the high orbit satellite receives the login request and sends a login request response to the terminal, and the terminal receives the login request response and designates the low orbit satellite serving by the terminal based on the login request or the login request response in the process;
step S3: the terminal establishes connection with a designated low-orbit satellite;
if the terminal does not have a positioning function, in step S1, the login request does not include terminal location information;
in the step S2, in the above step,
the login request response comprises information of candidate low-orbit satellites capable of providing services for the terminal, and the terminal is specified as the low-orbit satellite providing the services for the terminal based on the information of the candidate low-orbit satellites in the login request response in the following ways:
step S21: the terminal measures the candidate low-orbit satellites based on the information of the candidate low-orbit satellites in the login request response and sends a measurement report to the high-orbit satellites;
step S22: the satellite communication system specifies a low-orbit satellite serving the terminal based on the measurement report, and the high-orbit satellite transmits a low-orbit satellite connection command to the terminal, wherein the low-orbit satellite connection command contains information of the specified low-orbit satellite;
in step S2, the information of the candidate low-earth orbit satellite includes:
IDs of a plurality of candidate low-earth satellites, frequencies and reference signals used by the candidate low-earth satellites, and
at least one of a beam ID of a plurality of candidate low earth orbit satellites, a frequency used by a candidate beam, and a reference signal;
and a transmission resource and a transmission configuration for sending the measurement report;
in step S2, the information about the specified low-earth satellite includes: the ID of the designated low-orbit satellite and/or the beam ID of the designated low-orbit satellite, the position of the control time slot allocated for the terminal, and the timing and frequency offset;
in step S3, the terminal establishes a connection with the specified low-earth orbit satellite in the following manner:
step S31: a terminal receives a broadcast message sent by a designated low-orbit satellite;
step S32: the terminal sends a control message to the low-orbit satellite at the position of the allocated control time slot by using the timing and frequency offset in the information of the designated low-orbit satellite;
step S33: and the low-earth orbit satellite feeds back a response message to the terminal.
2. The terminal registration method in a satellite communication system according to claim 1, wherein in the step S1, the broadcast message of the high-orbit satellite includes a network clock reference, a network information table, a satellite position table, and a registration slot position;
and the terminal sends a login request to the high orbit satellite at the login time slot position, wherein the login request comprises a terminal ID and terminal capability information.
3. The terminal registration method in a satellite communication system according to claim 1,
in step S21, the measurement of the candidate low-earth orbit satellite includes: receiving a corresponding reference signal at the frequency of each candidate low-earth satellite and/or beam to measure the strength of the reference signal of the corresponding low-earth satellite and/or beam;
in step S22, the measurement report includes one or more preferred low-earth orbit satellite IDs and measurement information thereof; and/or one or more preferred beam IDs and their measurement information.
4. The terminal registration method in a satellite communication system according to claim 1, wherein in the step S31, the broadcast message transmitted by the low-earth satellite includes a network clock reference and a satellite position table;
in the step S32, the control message includes a terminal ID, channel state information, and a power headroom;
in the step S33, the response message includes a connection success indication, transmission resources, transmission configuration, and a correction message.
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| CN114374425B (en) * | 2022-01-14 | 2022-09-16 | 中国科学院上海微系统与信息技术研究所 | Terminal computing service resource request method in communication network |
| CN114928402B (en) * | 2022-05-19 | 2024-05-07 | 成都中科微信息技术研究院有限公司 | Satellite terminal position updating method based on DVB protocol improvement, satellite terminal and satellite communication system |
| CN115580343B (en) * | 2022-11-24 | 2023-04-18 | 北京九天微星科技发展有限公司 | Low-orbit satellite autonomous orbit control method, device and system |
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| WO2008103557A1 (en) * | 2007-02-21 | 2008-08-28 | Skybitz, Inc. | Satellite aided location tracking and data services using geo and leo satellites |
| CN111106865A (en) * | 2018-10-25 | 2020-05-05 | 华为技术有限公司 | Communication method, device and system based on satellite network |
| CN110166108A (en) * | 2019-04-30 | 2019-08-23 | 中国人民解放军军事科学院国防科技创新研究院 | Low orbit satellite time division multiple acess cut-in method |
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