CN115494531B - User position tracking method and device based on star chain - Google Patents
User position tracking method and device based on star chain Download PDFInfo
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- CN115494531B CN115494531B CN202211430700.5A CN202211430700A CN115494531B CN 115494531 B CN115494531 B CN 115494531B CN 202211430700 A CN202211430700 A CN 202211430700A CN 115494531 B CN115494531 B CN 115494531B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/393—Trajectory determination or predictive tracking, e.g. Kalman filtering
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- 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
- H04B7/18521—Systems of inter linked satellites, i.e. inter satellite service
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The application provides a user position tracking method and device based on a star link, which belong to the technical field of communication and are used for accurately tracking the position of a user. In the method, the primary satellite performs position tracking on the first user, and a first moving track of the first user in a first time period can be obtained. At this time, the primary satellite may continue to perform position tracking on the first user, thereby obtaining a third movement trajectory of the first user during the second time period. And the master satellite can trigger the slave satellite to perform auxiliary position tracking on the first user through the first moving track so as to obtain a second moving track of the first user in a second time period. Therefore, the main satellite can correct the third moving track according to the second moving track so as to accurately track the position of the user.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a user location tracking method and apparatus based on a star link.
Background
With the continuous development of New Radio (NR) systems, satellite communication technology is a technology that is being developed in focus in the future. Specifically, the third generation partnership project (3 rd generation partnership project,3 gpp) proposes that a satellite provide the functionality of a base station to provide network services to users within a cell covered by the satellite. Under the circumstance, the satellite needs to track the position change of the user in real time so as to switch the user to a cell with better signal quality in time when the signal quality of the user is poor, thereby avoiding the service of the user from being influenced.
Therefore, how to accurately track the position of the user is a problem to be solved at present.
Disclosure of Invention
The embodiment of the application provides a user position tracking method and device based on a star link, so that the position of a user can be accurately tracked.
In order to achieve the purpose, the following technical scheme is adopted in the application:
in a first aspect, a method for tracking a user location based on a star link is provided. The method comprises the following steps: the method comprises the steps that a first satellite sends a first moving track of a first user to a second satellite, wherein the first satellite is a main satellite of the first user, the second satellite is a sub-satellite of the first user, and the first moving track is a moving track obtained by the first satellite through position tracking of the first user within a first time period; the first satellite receives a second movement track of the first user from the second satellite, wherein the second movement track of the first user is a movement track obtained by the second satellite performing position tracking on the first user in a second time period; and the first satellite corrects a third movement track according to the second movement track, wherein the third movement track is the movement track obtained by the first satellite for carrying out position tracking on the first user in a second time period.
Based on the method of the first aspect, the primary satellite performs position tracking on the first user, and a first moving track of the first user in the first time period may be obtained. At this time, the primary satellite may continue to perform position tracking on the first user, thereby obtaining a third movement trajectory of the first user during the second time period. And the master satellite can trigger the slave satellite to perform auxiliary position tracking on the first user through the first moving track so as to obtain a second moving track of the first user in a second time period. Therefore, the main satellite can correct the third moving track according to the second moving track so as to accurately track the position of the user.
In one possible design, before the first satellite transmits the first movement trajectory of the first user to the second satellite, the method of the first aspect further includes: the first satellite transmits first indication information to the first user. Wherein the first indication information is used for indicating: during position tracking by the primary satellite, the user needs to communicate with the primary satellite using the signal of the first symbol structure. Optionally, the signal of the first symbol structure is a signal with a symbol length that varies in proportion to the length of the cyclic shift code. For example, the symbol length and cyclic shift code length may be subcarrier spacing of 15kHz, 30kHz, 60kHz, 120kHz, and so on. That is, the communication between the first user and the first satellite may reuse the symbol structure of the NR system, so that the difficulty of implementing the communication in the satellite communication system may be reduced.
Optionally, after the first satellite transmits the first movement trajectory of the first user to the second satellite, the method of the first aspect further includes: the first satellite sends second indication information to the first user, wherein the second indication information is used for indicating that: during the position tracking process through the main satellite and the auxiliary satellite, a user needs to communicate with the main satellite and the auxiliary satellite by using a signal of a second symbol structure, wherein the symbol length of the signal of the second symbol structure is the same as that of the signal of the first symbol structure, and the cyclic shift code length of the signal of the second symbol structure is greater than that of the signal of the first symbol structure. That is to say, in the process of simultaneously tracking and positioning the first user by the master satellite and the slave satellite, the first user needs to simultaneously communicate with a plurality of satellites in different directions, and at this time, the signal multipath effect increases and the signal quality is affected. Therefore, the length of the cyclic shift code can be increased without increasing the length of the symbol, thereby resisting the multipath effect and improving the signal quality without increasing the communication overhead.
In a possible design, before the first satellite transmits the first moving trajectory of the first user to the second satellite, the method according to the first aspect further includes: the first satellite determines that position tracking of the first user is required to be assisted by the slave satellite; the first satellite will determine the slave satellite as the second satellite. That is, only if needed, the master satellite triggers the slave satellite to assist in position tracking the first user to take into account position tracking accuracy and communication overhead.
Optionally, the first satellite determining that position tracking of the first user by the slave satellite assistance is required comprises: the first satellite determines that the first user moves to the edge of a first cell according to the first moving track, wherein the first cell is a service cell provided by the first satellite; the first satellite determines that position tracking of the first user by the slave satellite is required based on the first user moving to the edge of the first cell. It can be appreciated that when the first user is located at the edge of the first cell, the signal quality of the first user is generally reduced, resulting in reduced position tracking accuracy. At this point, it is necessary to trigger assisted position tracking of the first user from the satellite.
Alternatively, trustworthy, the first satellite determining that position tracking of the first user by the slave satellite is required comprises: a first satellite receives service information from a first user of a network. The service information of the first user is used for indicating that the first user needs to be assisted by the slave satellite to perform position tracking on the first user; the first satellite determines that position tracking of the first user is required to be assisted by the slave satellite according to the service information. That is, in the case of a business requirement, the master satellite may trigger the slave satellite to perform the assisted position tracking on the first user to meet the business requirement.
Optionally, the first satellite determines the slave satellite as the second satellite, including: the method comprises the steps that a first satellite determines a plurality of slave satellites, wherein service cells provided by the plurality of slave satellites are overlapped with a first cell, and the first cell is the service cell provided by the first satellite; the first satellite determines a slave satellite having a smallest overlap of a serving cell of the plurality of slave satellites with the first cell as a second satellite. It will be appreciated that the first cell may be stationary and not move as the primary satellite moves. When one primary satellite moves to a position where the primary satellite cannot cover the first cell, other primary satellites in the same orbit can cover the first cell along with the movement, so that the first cell is continuously served. The difference is that the serving cell of the slave satellite moves as the slave satellite moves, and at this time, the slave satellite with the smallest overlapping area of the serving cell and the first cell is selected as the second satellite, that is, the serving cell of the second satellite just moves to overlap with the first cell, and the second satellite can provide the auxiliary position tracking service for a longer time.
In a second aspect, there is provided a star-chain based user position tracking apparatus, applied to a first satellite, the apparatus including: the receiving and sending module is used for sending a first moving track of a first user to a second satellite by a first satellite, wherein the first satellite is a main satellite of the first user, the second satellite is a slave satellite of the first user, and the first moving track is obtained by the first satellite through position tracking on the first user within a first time period; the receiving and sending module is used for the first satellite to receive a second moving track of the first user from the second satellite, wherein the second moving track of the first user is a moving track obtained by the second satellite for carrying out position tracking on the first user in a second time period; and the processing module is used for correcting a third moving track by the first satellite according to the second moving track, wherein the third moving track is a moving track obtained by the first satellite for carrying out position tracking on the first user in a second time period.
In one possible design, the transceiver module is further configured to send, by the first satellite, the first indication information to the first user. Wherein the first indication information is used for indicating: during position tracking by the primary satellite, the user needs to communicate with the primary satellite using the signal of the first symbol structure. Optionally, the signal of the first symbol structure is a signal with a symbol length that varies in proportion to the length of the cyclic shift code.
Optionally, the transceiver module is further configured to send, by the first satellite, second indication information to the first user, where the second indication information is used to indicate: in the process of position tracking through the main satellite and the auxiliary satellite, a user needs to communicate with the main satellite and the auxiliary satellite by using a signal of a second symbol structure, wherein the symbol length of the signal of the second symbol structure is the same as that of the signal of the first symbol structure, and the cyclic shift code length of the signal of the second symbol structure is larger than that of the signal of the first symbol structure.
In one possible embodiment, the processing module is further configured to determine that the first satellite needs to perform position tracking on the first user with assistance from the slave satellite; the first satellite will determine the slave satellite as the second satellite.
Optionally, the processing module is further configured to determine, by the first satellite, that the first user moves to an edge of a first cell according to the first movement trajectory, where the first cell is a serving cell provided by the first satellite; and the processing module is further used for determining that the first user needs to be assisted by the slave satellite to perform position tracking on the first user according to the movement of the first user to the edge of the first cell by the first satellite.
Or, trustfully, the processing module is further configured to receive, by the first satellite, traffic information from the first user of the network. The service information of the first user is used for indicating that the first user needs to be assisted by the slave satellite to perform position tracking on the first user; the first satellite determines that position tracking of the first user is required to be assisted by the slave satellite based on the service information.
Optionally, the processing module is further configured to determine, by the first satellite, a plurality of slave satellites, where service cells provided by the plurality of slave satellites overlap with a first cell, where the first cell is the service cell provided by the first satellite; and the processing module is also used for determining the slave satellite with the smallest overlapping of a service cell and the first cell in the plurality of slave satellites as a second satellite by the first satellite.
Optionally, the user position tracking device of the second aspect may further comprise a storage module storing a program or instructions. The program or instructions, when executed by the processing module, cause the user location tracking device to perform the method for star-chain based user location tracking according to the first aspect.
It should be noted that the user location tracking apparatus according to the second aspect may be a network device, a chip (system) or other component or assembly that may be disposed in the network device, or an apparatus that includes the network device, which is not limited in this application.
In addition, for the technical effect of the user location tracking apparatus according to the second aspect, reference may be made to the technical effect of the user location tracking method based on a star chain according to the first aspect, and details are not repeated here.
In a third aspect, an apparatus for tracking a user position is provided, comprising: a processor and a memory; the memory is configured to store a computer program which, when executed by the processor, causes the user location tracking device to perform the method for user location tracking based on a star-chain as described in the first aspect.
In a possible design, the user position tracking device according to the third aspect may further include a transceiver. The transceiver may be a transmit-receive circuit or an interface circuit. The transceiver may be used for the user position tracking device of the third aspect to communicate with other user position tracking devices.
In this application, the user location tracking device according to the third aspect may be a network device, or a chip (system) or other component or assembly that can be disposed in the network device, or an apparatus including the network device.
In addition, for the technical effect of the user location tracking apparatus according to the third aspect, reference may be made to the technical effect of the user location tracking method based on a star chain according to the first aspect, and details are not repeated here.
In a fourth aspect, a computer-readable storage medium is provided, comprising: computer programs or instructions; the computer program or instructions, when run on a computer, cause the computer to perform the method for star-chain based user location tracking according to the first aspect.
In a fifth aspect, there is provided a computer program product comprising: computer program or instructions for causing a computer to perform the method for star-chain based user location tracking according to the first aspect when the computer program or instructions is run on the computer.
Drawings
Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;
fig. 2 is a schematic flowchart of a user location tracking method based on a star link according to an embodiment of the present application;
fig. 3 is a schematic view of an application scenario of the user location tracking method based on a star chain according to the embodiment of the present application;
FIG. 4 is a first schematic structural diagram of a user position tracking apparatus according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a user position tracking device according to an embodiment of the present application.
Detailed Description
The technical solution in the present application will be described below with reference to the accompanying drawings.
The technical solution of the embodiment of the present application may be applied to various communication systems, for example, a wireless fidelity (WiFi) system, a vehicle-to-any object (V2X) communication system, a device-to-device (D2D) communication system, a vehicle networking communication system, a fourth-generation mobile communication system (4 g), such as a Long Term Evolution (LTE) system, a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a fifth-generation mobile communication system (5 g), such as a new radio, NR (new radio, NR) system, and a future communication system, such as a sixth-generation mobile communication system (6 g).
This application is intended to present various aspects, embodiments or features around a system that may include a number of devices, components, modules, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules etc. discussed in connection with the figures. Furthermore, a combination of these schemes may also be used.
In addition, in the embodiments of the present application, words such as "exemplary", "for example", etc. are used to mean serving as examples, illustrations or explanations. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the word using examples is intended to present concepts in a concrete fashion.
In the embodiment of the present invention, "information", "signal", "message", "channel", "signaling" may be used in combination, and it should be noted that the meaning to be expressed is matched when the difference is not emphasized. "of", "corresponding", and "corresponding" may sometimes be used interchangeably, and it should be noted that the intended meaning of these terms is matched when a distinction is not emphasized. Furthermore, "/" mentioned in this application may be used to indicate a relationship of "or".
The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.
To facilitate understanding of the embodiments of the present application, a communication system applicable to the embodiments of the present application will be first described in detail by taking the communication system shown in fig. 1 as an example. Fig. 1 is a schematic structural diagram of a communication system to which the communication method provided in the embodiment of the present application is applied.
As shown in fig. 1, the communication system may be applied to an inter-satellite communication scenario and a satellite-to-ground communication scenario, and the communication system may include: a first user, a first satellite, and a second satellite.
The first user may be a user terminal (terminal for short), and the terminal may be a terminal having a transceiving function, or a chip system provided in the terminal. The terminal can also be referred to as a User Equipment (UE), an access terminal, a subscriber unit (subscriber unit), a subscriber station, a Mobile Station (MS), a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user device. The terminal in the embodiment of the present application may be a mobile phone (mobile phone), a cellular phone (cellular phone), a smart phone (smart phone), a tablet computer (Pad), a wireless data card, a Personal Digital Assistant (PDA), a wireless modem (modem), a handheld device (handset), a laptop computer (laptop computer), a Machine Type Communication (MTC) terminal, a computer with a wireless transceiving function, a Virtual Reality (VR) terminal, an Augmented Reality (AR) terminal, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a terminal in communication perception integration, a wireless terminal in remote medical (remote medical) system, a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (security), a wireless terminal in city (smart) and a wireless terminal in city (street), a wireless terminal in street side unit, and the like. The terminal of the present application may also be an on-board module, an on-board component, an on-board chip, or an on-board unit built into a vehicle as one or more components or units.
The first satellite or the second satellite may refer to a non-ground base station or a non-ground device, such as an unmanned aerial vehicle, a hot air balloon, a low-orbit satellite, a medium-orbit satellite, a high-orbit satellite, and the like, and the specific form is not limited. The first satellite may include: a first acquisition, pointing, tracking, APT system and a first communication system. The first APT system is mainly used for the first satellite to perform functions such as acquisition, alignment, tracking and the like, for example, determining an incoming wave direction of an incident signal, adjusting a transmitting wave aiming at a receiving direction and the like, so as to reduce the influence of channel attenuation and interference and ensure the safety and transmission rate of data transmission. The first APT system may be implemented by an optical system, or may also be implemented by a microwave band system, which is not limited. The first communication system is primarily used for communication between the first satellite and other satellites, such as a second satellite. The second satellite may include: the specific implementation principle of the second APT system and the second communication system is similar to that of the first satellite, which can be understood with reference to the figure and is not described in detail again.
In the communication system, the first satellite may be a primary satellite for the first user. The primary satellite performs position tracking on the first user, and a first moving track of the first user in a first time period can be obtained. At this time, the primary satellite may continue to perform position tracking on the first user, thereby obtaining a third movement trajectory of the first user during the second time period. And, the master satellite may trigger a slave satellite of the first user, such as a second satellite, to perform auxiliary position tracking on the first user through the first moving track to obtain a second moving track of the first user in a second time period. Therefore, the main satellite can correct the third movement track according to the second movement track so as to accurately track the position of the user.
For convenience of understanding, the interaction flow between network elements/devices in the above communication system will be specifically described below by way of method embodiments in conjunction with fig. 2 to 3. The communication method provided by the embodiment of the present application may be applied to the above-mentioned communication system, and is specifically applied to various scenarios mentioned in the above-mentioned communication system, which are specifically described below.
Fig. 2 is a schematic flowchart of a user location tracking method based on a star link according to an embodiment of the present application. The user position tracking method based on the star chain is mainly suitable for communication between a first satellite and a second satellite in the communication system. Specifically, as shown in fig. 2, the process of the user location tracking method based on the star chain is as follows:
s201, the first satellite sends a first moving track of the first user to the second satellite.
The first satellite is a main satellite of the first user, the second satellite is a slave satellite of the first user, and the first movement track is a movement track obtained by the first satellite for position tracking of the first user in the first time period. The first movement trace of the first user may include: the mobile terminal comprises a user identification of a first user and a plurality of track points of the first user, wherein the plurality of track points of the first user can form a mobile track of the first user. Alternatively, the first satellite may provide only the user identification of the first user, and the latest track point of the first user, to the second satellite.
In particular, the first satellite may determine that position tracking of the first user by the slave satellite assistance is required, thereby determining the slave satellite as the second satellite. That is, only if necessary, the master satellite triggers the slave satellite to perform the assisted position tracking on the first user, so as to achieve both the position tracking accuracy and the communication overhead.
For example, the first satellite may determine that the first user moved to the edge of the first cell based on the first movement trajectory. Wherein the first cell is a serving cell provided by the first satellite; the first satellite determines that position tracking of the first user by the slave satellite is required based on the first user moving to the edge of the first cell. It can be appreciated that when the first user is located at the edge of the first cell, the signal quality of the first user is generally reduced, resulting in reduced location tracking accuracy. At this point, it is necessary to trigger assisted position tracking of the first user from the satellite.
As another example, a first satellite receives service information from a first user of a network. The service information of the first user is used for indicating that the first user needs to be assisted by the slave satellite to perform position tracking on the first user; the first satellite determines that position tracking of the first user is required to be assisted by the slave satellite based on the service information. That is, in the case of a business requirement, the master satellite may trigger the slave satellite to perform the assisted position tracking on the first user to meet the business requirement.
The first satellite may determine a plurality of slave satellites. Wherein a plurality of serving cells provided from the satellite overlap with a first cell, wherein the first cell is a serving cell provided by the first satellite. On the basis, the first satellite determines the slave satellite with the smallest overlapping of the service cell and the first cell in the plurality of slave satellites as the second satellite. It will be appreciated that the first cell may be stationary and not move as the primary satellite moves. For example, when one primary satellite moves to a location that does not cover the first cell, other primary satellites in orbit may continue to serve the first cell as they move to cover the first cell. Alternatively, the primary satellite may be a geostationary satellite, which is stationary relative to the ground. The secondary satellite is different from the primary satellite in that the serving cell of the secondary satellite moves along with the movement of the secondary satellite, and the secondary satellite with the smallest overlapping area between the serving cell and the first cell is selected as the second satellite, namely, the serving cell of the second satellite just moves to overlap with the first cell, and the second satellite can provide auxiliary position tracking service for a longer time.
Illustratively, as shown in FIG. 3, satellite 1 is the master satellite and satellite 2-satellite 4 are slaves in the same orbit. The V1 direction is the direction of movement of satellite 2-satellite 4. At this time, as the satellite 2 moves, the serving cell of the satellite 2 has just moved to overlap with the serving cell of the satellite 1, and thus the satellite 1 can select the satellite 2 to provide the assisted position tracking service.
S202, the first satellite receives a second moving track of the first user from the second satellite.
And the second movement track of the first user is a movement track obtained by the second satellite for carrying out position tracking on the first user in a second time period. The second satellite can receive the first movement track of the first user, so that the position tracking of the first user is continued according to the first movement track of the first user to obtain a second movement track of the first user. For example, the second satellite may find the first user according to the user identifier of the first user, so as to continue to track the position of the first user according to the latest track point of the first user in the plurality of track points of the first user, so as to obtain the second movement track of the first user. It will be appreciated that for the second satellite, the second satellite may save multiple track points of the first user as a backup.
And S203, the first satellite corrects the third moving track according to the second moving track.
And the third movement track is a movement track obtained by the first satellite for position tracking of the first user in the second time period.
For example, the first satellite may perform weighted summation on the coordinates of each track point in the second moving trajectory and the coordinates of a corresponding track point in the third moving trajectory to obtain a new track point. And the moving track formed by the new track points can be used as the moving track corrected by the first user. In the process of weighted summation, the weight of each track point in the second movement track may be greater than the weight of each track point in the third movement track. Alternatively, the first satellite may replace a part of the second movement trajectory with a corresponding part of the third movement trajectory to realize the third movement trajectory.
In summary, the primary satellite performs position tracking on the first user, and may obtain a first moving trajectory of the first user in the first time period. At this time, the primary satellite may continue to perform position tracking on the first user, thereby obtaining a third movement trajectory of the first user during the second time period. And the master satellite can trigger the slave satellite to perform auxiliary position tracking on the first user through the first moving track so as to obtain a second moving track of the first user in a second time period. Therefore, the main satellite can correct the third moving track according to the second moving track so as to accurately track the position of the user.
In one possible design, prior to S201, the first satellite may also send a first indication to the first user. Wherein the first indication information is used for indicating: during position tracking by the primary satellite, the user needs to communicate with the primary satellite using the signal of the first symbol structure. For example, the first indication information may be an index of a subcarrier interval corresponding to a signal of the first symbol structure. Optionally, the signal of the first symbol structure is a signal with a symbol length that varies in proportion to the length of the cyclic shift code. For example, the symbol length and cyclic shift code length may be subcarrier spacing of 15kHz, 30kHz, 60kHz, 120kHz, and so on. That is, the communication between the first user and the first satellite may reuse the symbol structure of the NR system, so that the difficulty of implementing the communication in the satellite communication system may be reduced.
Optionally, after S202, the first satellite sends second indication information to the first user, where the second indication information indicates: during the position tracking process through the main satellite and the auxiliary satellite, a user needs to communicate with the main satellite and the auxiliary satellite by using a signal of a second symbol structure, wherein the symbol length of the signal of the second symbol structure is the same as that of the signal of the first symbol structure, and the cyclic shift code length of the signal of the second symbol structure is greater than that of the signal of the first symbol structure. That is to say, in the process of simultaneously tracking and positioning the first user by the master satellite and the slave satellite, the first user needs to simultaneously communicate with a plurality of satellites in different directions, and at this time, the signal multipath effect increases and the signal quality is affected. Therefore, the length of the cyclic shift code can be increased without increasing the length of the symbol, thereby resisting the multipath effect and improving the signal quality without increasing the communication overhead.
The user location tracking method based on the star chain provided by the embodiment of the present application is described in detail above with reference to fig. 2 to 3. A user location tracking device for performing the star-link-based user location tracking method provided by the embodiment of the present application is described in detail below with reference to fig. 4 to 5. The user position tracking device 400 is adapted for use with a first satellite in the communication system described above and includes a transceiver module 401 and a processing module 402.
The transceiver module 401 is configured to transmit a first moving track of a first user to a second satellite, where the first satellite is a primary satellite of the first user, the second satellite is a secondary satellite of the first user, and the first moving track is a moving track obtained by the first satellite performing position tracking on the first user within a first time period; a transceiver module 401, configured to receive, by a first satellite, a second moving trajectory of a first user from a second satellite, where the first moving trajectory is a moving trajectory obtained by the second satellite performing position tracking on the first user within a second time period; and the processing module 402 is configured to modify, by the first satellite, a third movement trajectory according to the second movement trajectory, where the third movement trajectory is a movement trajectory obtained by the first satellite performing position tracking on the first user within the second time period.
In a possible design, the transceiver module 401 is further configured to transmit the first indication information to the first user from the first satellite. Wherein the first indication information is used for indicating: during position tracking by the primary satellite, the user needs to communicate with the primary satellite using the signal of the first symbol structure. Optionally, the signal of the first symbol structure is a signal with a symbol length varying in proportion to a cyclic shift code length.
Optionally, the transceiver module 401 is further configured to send, by the first satellite, second indication information to the first user, where the second indication information is used to indicate: in the process of position tracking through the main satellite and the auxiliary satellite, a user needs to communicate with the main satellite and the auxiliary satellite by using a signal of a second symbol structure, wherein the symbol length of the signal of the second symbol structure is the same as that of the signal of the first symbol structure, and the cyclic shift code length of the signal of the second symbol structure is larger than that of the signal of the first symbol structure.
In one possible design, the processing module 402 is further configured to determine that the first satellite needs to be assisted by the slave satellite for position tracking of the first user; the first satellite will determine the slave satellite as the second satellite.
Optionally, the processing module 402 is further configured to determine, by the first satellite, that the first user moves to an edge of a first cell according to the first movement trajectory, where the first cell is a serving cell provided by the first satellite; the processing module 402 is further configured to determine that the first user needs to be assisted by the slave satellite for position tracking by the first satellite according to the first user moving to the edge of the first cell.
Or, trustfully, the processing module 402 is further configured for the first satellite to receive service information from the first user of the network. The service information of the first user is used for indicating that the first user needs to be assisted by the slave satellite to perform position tracking on the first user; the first satellite determines that position tracking of the first user is required to be assisted by the slave satellite based on the service information.
Optionally, the processing module 402 is further configured to determine, by the first satellite, a plurality of slave satellites, where service cells provided by the plurality of slave satellites overlap with a first cell, where the first cell is the service cell provided by the first satellite; the processing module 402 is further configured to determine, by the first satellite, the slave satellite with the smallest overlapping of the serving cell and the first cell in the plurality of slave satellites as the second satellite.
Optionally, the user position tracking device 400 may also include a memory module that stores programs or instructions. The program or instructions, when executed by the processing module, enable the user position tracking device 400 to perform the function of the first satellite in the star-link based user position tracking method as shown in fig. 2.
It should be noted that the user location tracking apparatus 400 may be a network device, a chip (system) or other components or assemblies that can be disposed in the network device, or an apparatus including the network device, which is not limited in this application.
In addition, the technical effect of the user location tracking apparatus 400 can refer to the technical effect of the user location tracking method based on the star chain shown in fig. 2, and will not be described herein again.
Fig. 5 is a schematic structural diagram of a user position tracking apparatus according to an embodiment of the present application. The user position tracking device may be a terminal, or may be a chip (system) or other component or assembly that may be disposed on the terminal. As shown in FIG. 5, a user position tracking device 500 may include a processor 501. Optionally, the user position tracking device 500 may also include a memory 502 and/or a transceiver 503. The processor 501 is coupled to the memory 502 and the transceiver 503, such as may be connected via a communication bus.
The following describes the components of the user position tracking device 500 in detail with reference to fig. 5:
the processor 501 is a control center of the user position tracking apparatus 500, and may be a single processor or a collective term for a plurality of processing elements. For example, the processor 501 is one or more Central Processing Units (CPUs), or may be an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application, such as: one or more microprocessors (digital signal processors, DSPs), or one or more Field Programmable Gate Arrays (FPGAs).
Alternatively, the processor 501 may perform various functions of the user location tracking device 500, such as performing the star-chain based user location tracking method described above in FIG. 2, by running or executing software programs stored in the memory 502, and invoking data stored in the memory 502.
In particular implementations, processor 501 may include one or more CPUs, such as CPU0 and CPU1 shown in fig. 5, as one embodiment.
In particular implementations, user location tracking device 500 may also include multiple processors, such as processor 501 and processor 504 shown in FIG. 5, as an example. Each of these processors may be a single-Core Processor (CPU) or a multi-Core Processor (CPU). A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).
The memory 502 is configured to store a software program for executing the scheme of the present application, and the processor 501 controls the execution of the software program.
Alternatively, memory 502 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 502 may be integrated with the processor 501 or may be separate and coupled to the processor 501 through an interface circuit (not shown in fig. 5) of the user position tracking device 500, which is not particularly limited in this embodiment of the present application.
A transceiver 503 for communication with other user position tracking devices. For example, where the user location tracking device 500 is a terminal, the transceiver 503 may be used to communicate with a network device or with another terminal device. As another example, where the user location tracking device 500 is a network device, the transceiver 503 may be used to communicate with a terminal or with another network device.
Optionally, the transceiver 503 may include a receiver and a transmitter (not separately shown in fig. 5). Wherein the receiver is configured to implement a receive function and the transmitter is configured to implement a transmit function.
Alternatively, the transceiver 503 may be integrated with the processor 501, or may exist independently, and is coupled to the processor 501 through an interface circuit (not shown in fig. 5) of the user position tracking apparatus 500, which is not specifically limited in this embodiment of the present application.
It should be noted that the structure of the user position tracking device 500 shown in fig. 5 does not constitute a limitation of the user position tracking device, and an actual user position tracking device may include more or less components than those shown, or some components may be combined, or a different arrangement of components.
In addition, for technical effects of the user location tracking apparatus 500, reference may be made to technical effects of the user location tracking method based on a star chain described in the foregoing method embodiment, and details are not repeated here.
It should be understood that the processor in the embodiments of the present application may be a Central Processing Unit (CPU), and the processor may also be other general purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
It will also be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of Random Access Memory (RAM) are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct bus RAM (DR RAM).
The above embodiments may be implemented in whole or in part by software, hardware (e.g., circuitry), firmware, or any combination thereof. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. The procedures or functions according to the embodiments of the present application are wholly or partially generated when the computer instructions or the computer program are loaded or executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more collections of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.
It should be understood that the term "and/or" herein is only one kind of association relationship describing the association object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. In addition, the "/" in this document generally indicates that the former and latter associated objects are in an "or" relationship, but may also indicate an "and/or" relationship, which may be understood with particular reference to the former and latter text.
In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.
It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not imply any order of execution, and the order of execution of the processes should be determined by their functions and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A user position tracking method based on a star chain is characterized by comprising the following steps:
a first satellite transmits a first moving track of a first user to a second satellite, wherein the first satellite is a main satellite of the first user, the second satellite is a slave satellite of the first user, and the first moving track is obtained by the first satellite through position tracking of the first user within a first time period;
the first satellite receives a second movement track of the first user from the second satellite, wherein the second movement track is obtained by the second satellite through position tracking of the first user in a second time period;
the first satellite corrects a third movement track according to the second movement track, wherein the third movement track is obtained by the first satellite through position tracking of the first user in the second time period;
before the first satellite transmits the first movement trajectory of the first user to a second satellite, the method further comprises:
the first satellite transmits first indication information to the first user, wherein the first indication information is used for indicating that: in the process of carrying out position tracking through the main satellite, a user needs to communicate with the main satellite by using a signal of a first symbol structure;
and after the first satellite transmits the first movement trajectory of the first user to a second satellite, the method further comprises:
the first satellite sends second indication information to the first user, wherein the second indication information is used for indicating that: in the process of position tracking through the main satellite and the slave satellite, a user needs to communicate with the main satellite and the slave satellite by using a signal of a second symbol structure, wherein the symbol length of the signal of the second symbol structure is the same as that of the signal of the first symbol structure, and the cyclic shift code length of the signal of the second symbol structure is greater than that of the signal of the first symbol structure.
2. The method of claim 1, wherein the signal of the first symbol structure is a signal with a symbol length that varies in proportion to a cyclic shift code length.
3. The method of claim 1, wherein before the first satellite transmits the first movement trajectory of the first user to the second satellite, the method further comprises:
the first satellite determines that position tracking of the first user is required by slave satellite assistance;
the first satellite determines a slave satellite as the second satellite.
4. The method of claim 3, wherein the first satellite determining that position tracking of the first user is required with assistance from a satellite comprises:
the first satellite determines that the first user moves to the edge of a first cell according to the first movement track, wherein the first cell is a service cell provided by the first satellite;
the first satellite determines that position tracking of the first user is required as assisted by a slave satellite based on the first user moving to the edge of a first cell.
5. The method of claim 3, wherein the first satellite determining that position tracking of the first user by slave satellite assistance is required comprises:
the first satellite receives service information of the first user from a network, wherein the service information is used for indicating that the first user needs to be assisted by a slave satellite to perform position tracking on the first user;
and the first satellite determines that the first user needs to be assisted by a slave satellite to perform position tracking according to the service information.
6. The method of claim 3, wherein the first satellite determines a slave satellite as the second satellite, comprising:
the first satellite determines a plurality of slave satellites, wherein service cells provided by the slave satellites overlap with a first cell, wherein the first cell is the service cell provided by the first satellite;
the first satellite determines a slave satellite having a smallest overlap of a serving cell of the plurality of slave satellites with the first cell as the second satellite.
7. An apparatus for user position tracking based on a star chain, applied to a first satellite, the apparatus comprising:
the receiving and transmitting module is configured to transmit a first moving track of a first user to a second satellite, where the first satellite is a master satellite of the first user, the second satellite is a slave satellite of the first user, and the first moving track is a moving track obtained by the first satellite through position tracking of the first user within a first time period;
the transceiver module is configured to receive a second movement track of the first user from the second satellite, where the second movement track is a movement track obtained by the second satellite performing position tracking on the first user within a second time period;
a processing module, configured to modify a third movement trajectory according to the second movement trajectory, where the third movement trajectory is a movement trajectory obtained by the first satellite performing position tracking on the first user within the second time period;
the transceiver module is further configured to send, by the first satellite, first indication information to the first user, where the first indication information is used to indicate: in the process of carrying out position tracking through the main satellite, a user needs to communicate with the main satellite by using a signal of a first symbol structure;
and the transceiver module is further configured to send, by the first satellite, second indication information to the first user, where the second indication information is used to indicate: in the process of tracking the position through the main satellite and the auxiliary satellite, a user needs to communicate with the main satellite and the auxiliary satellite by using a signal of a second symbol structure, wherein the symbol length of the signal of the second symbol structure is the same as that of the signal of the first symbol structure, and the cyclic shift code length of the signal of the second symbol structure is greater than that of the signal of the first symbol structure.
8. A computer-readable storage medium, comprising: computer programs or instructions; the computer program or instructions, when run on a computer, cause the computer to perform the method of any one of claims 1-6.
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| US9888426B2 (en) * | 2015-05-01 | 2018-02-06 | Qualcomm Incorporated | Handoff for satellite communication |
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