CN112243260B - Terminal switching method, satellite base station, device and medium - Google Patents
Terminal switching method, satellite base station, device and medium Download PDFInfo
- Publication number
- CN112243260B CN112243260B CN201910652089.2A CN201910652089A CN112243260B CN 112243260 B CN112243260 B CN 112243260B CN 201910652089 A CN201910652089 A CN 201910652089A CN 112243260 B CN112243260 B CN 112243260B
- Authority
- CN
- China
- Prior art keywords
- base station
- satellite base
- switching
- terminal
- coverage area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
-
- 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
-
- 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
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a terminal switching method, a satellite base station, a device and a medium, wherein the method comprises the following steps: determining a switching period for executing switching between a first satellite base station and a second satellite base station which are adjacent; and when the switching period is reached, switching the terminal in the overlapping coverage area between the first satellite base station and the second satellite base station from the first satellite base station to the second satellite base station. The invention can reduce a large number of measurement reports and frequent switching decision processes aiming at each user equipment.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a terminal handover method, a satellite base station, an apparatus, and a medium.
Background
Under the current deployment of satellite access networks, when the satellite access is a 3GPP (3 rd Generation partnership project) access, the following methods can be used to connect to the 5G core network:
1. the function of gNB-DU (next generation base station-Distributed Unit; gNB: next generation base station, next generation NodeB; DU: Distributed Unit) is realized on the satellite. Part of the protocol of NR (next generation Radio) is handled by satellites. The DUs on the satellite and the ground CUs (Central units) are connected via an F1 interface, the F1 interface being carried over the satellite radio interface SRI.
2. The full function of the gNB is implemented on the satellite. The satellite and the terrestrial 5G core network are connected through a conventional N1/N2/N3 interface. The N1/N2/N3 interface is carried on top of the SRI.
Fig. 1 is a schematic diagram of the mobile coverage of the satellite base station at time T0, and fig. 2 is a schematic diagram of the mobile coverage of the satellite base station at time T1, as shown in fig. 1 and fig. 2, since the beam irradiation of the NGSO (non-geostationary-satellite) to the ground is dynamically changed, even if the ground terminal is not moved, the handover process may be caused by the coverage change of the satellite base station.
At time T0, the terminal is served by satellite base station a. As the satellite flies, at time T1, the terminal is located at a position where the satellite base station B provides wireless coverage, and the signal of the satellite base station a gradually decreases, and at this time, a handover procedure should be triggered to allow the serving base station of the terminal to be handed over from the base station a to the base station B.
The existing switching process is mainly triggered by a base station, and the base station executes a switching decision according to a measurement report provided by a terminal, selects a proper target cell, and then sends a switching request to a target base station corresponding to the target cell to complete the switching process.
The disadvantage of the prior art is that all terminals served by a satellite base station need to be handed over to the next satellite base station one by one, which causes high handover overhead, including the overhead of a large number of measurement reports and frequent handover decisions.
Disclosure of Invention
The invention provides a terminal switching method, a satellite base station, a device and a medium, which are used for reducing the overhead when a terminal served by the satellite base station is switched.
The embodiment of the invention provides a terminal switching method, which comprises the following steps:
determining a switching period for executing switching between a first satellite base station and a second satellite base station which are adjacent;
and when the switching period is reached, switching the terminal in the overlapping coverage area between the first satellite base station and the second satellite base station from the first satellite base station to the second satellite base station.
In an implementation, determining a handover period in which the neighboring first satellite base station and the second satellite base station perform the periodic handover includes:
determining an overlapping coverage area between adjacent first and second satellite base stations;
and determining the period of the periodic switching according to the moving speed and the overlapping coverage area of the first satellite base station and the second satellite base station.
In implementation, the overlapping coverage area between two adjacent satellite base stations is determined according to the coverage area of the static configuration of the satellite base stations or the wireless coverage parameter configuration of the adjacent satellite base stations.
In an implementation, handing over a terminal in an overlapping coverage area from a first satellite base station to a second satellite base station, further comprises:
switching preparation timer T for source base station side according to number of terminals to be switchedRELOCprepThe value is prolonged, and the value is increased,the T isRELOCprepThe extended value is used to ensure that the target base station has a response time.
In an implementation, handing over a terminal in an overlapping coverage area from a first satellite base station to a second satellite base station, further comprises:
when the switching command is sent to each terminal needing to be switched, the time window for sending the switching command is randomized.
In implementation, the terminal in the overlapping coverage area is switched from the first satellite base station to the second satellite base station based on the group switching of the Xn interface; or, it is switched based on the group switching of the NG interface.
In an implementation, the method further comprises the following steps:
and in a switching period, when determining that a terminal moves out of an overlapped coverage area, triggering a switching process for the terminal.
In implementation, determining that there is a terminal to move out of the overlapping coverage area includes:
indicating the satellite base station to carry an indication for the terminal to judge whether to move out of the overlapping coverage area in the system broadcast;
and after the terminal determines to move out of the overlapping coverage area according to the indication and reports the measurement report, determining that the terminal moves out of the overlapping coverage area.
In an implementation, after determining the overlapping coverage area, the method further includes:
conditional switching is used to hand off terminals in overlapping coverage areas from one satellite base station to another.
An embodiment of the present invention provides a satellite base station, where the satellite base station is a first satellite base station, and the satellite base station includes:
a processor for reading the program in the memory, performing the following processes:
determining a switching period for executing switching between a first satellite base station and a second satellite base station which are adjacent; when the switching period is reached, switching the terminal in the overlapping coverage area between the first satellite base station and the second satellite base station from the first satellite base station to the second satellite base station;
a transceiver for receiving and transmitting data under the control of the processor.
In an implementation, determining a handover period in which the neighboring first satellite base station and the second satellite base station perform the periodic handover includes:
determining an overlapping coverage area between adjacent first and second satellite base stations;
and determining the period of the periodic switching according to the moving speed and the overlapping coverage area of the first satellite base station and the second satellite base station.
In implementation, the overlapping coverage area between two adjacent satellite base stations is determined according to the coverage area of the static configuration of the satellite base stations or the wireless coverage parameter configuration of the adjacent satellite base stations.
In an implementation, handing over a terminal in an overlapping coverage area from a first satellite base station to a second satellite base station, further comprises:
switching preparation timer T for source base station side according to number of terminals to be switchedRELOCprepExtended value of said TRELOCprepThe extended value is used to ensure that the target base station has a response time.
In an implementation, handing over a terminal in an overlapping coverage area from a first satellite base station to a second satellite base station, further comprises:
when the switching command is sent to each terminal needing to be switched, the time window for sending the switching command is randomized.
In implementation, the terminal in the overlapping coverage area is switched from the first satellite base station to the second satellite base station based on the group switching of the Xn interface; or, it is switched based on the group switching of the NG interface.
In an implementation, the method further comprises the following steps:
and in a switching period, when determining that a terminal moves out of an overlapped coverage area, triggering a switching process for the terminal.
In implementation, determining that there is a terminal to move out of the overlapping coverage area includes:
indicating the satellite base station to carry an indication for the terminal to judge whether to move out of the overlapping coverage area in the system broadcast;
and after the terminal determines to move out of the overlapping coverage area according to the indication and reports the measurement report, determining that the terminal moves out of the overlapping coverage area.
In an implementation, after determining the overlapping coverage area, the method further includes:
conditional switching is used to hand off terminals in overlapping coverage areas from one satellite base station to another.
The embodiment of the invention provides a switching device of a terminal, which comprises:
the system comprises a period determining module, a switching period determining module and a switching control module, wherein the period determining module is used for determining the switching period of the switching between the adjacent first satellite base station and the second satellite base station;
and the switching module is used for switching the terminal in the overlapping coverage area between the first satellite base station and the second satellite base station from the first satellite base station to the second satellite base station when the switching period is reached.
An embodiment of the present invention provides a computer-readable storage medium storing a computer program for executing the handover method of the terminal.
The invention has the following beneficial effects:
in the prior art, a large amount of switching overhead mainly comes from the need of switching all terminals served by a satellite base station to the next satellite base station one by one, but in the technical scheme provided by the embodiment of the invention, aiming at the coverage characteristic of a low-orbit satellite, the switching is needed even if the terminal does not move, so that the overlapping coverage area between two adjacent satellite base stations is determined; and further determining a switching period according to the moving speeds of the two satellites and the overlapping coverage area; at the end of the switching period, terminals in the overlapped coverage area are switched from one satellite base station to another satellite base station uniformly. Because the switching processing is not carried out on each terminal one by one, but the terminals are switched uniformly according to the period, a large number of measurement reports aiming at each UE and frequent switching decision processes can be reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a diagram illustrating the mobile coverage of a satellite base station at time T0 in the prior art;
FIG. 2 is a diagram illustrating the mobile coverage of a satellite base station at time T1 in the prior art;
fig. 3 is a schematic flow chart illustrating an implementation of a handover method of a terminal according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of cycle counting according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a periodic handover procedure according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a group switching process based on an Xn interface according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a conditional handover procedure in an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a satellite base station according to an embodiment of the present invention.
Detailed Description
The inventor notices in the process of invention that:
currently 3GPP is studying to support satellite access in 5G systems to provide wireless coverage for larger services. The prior art researches a method for seamless coverage by using a low-earth satellite to form a satellite network, however, due to the coverage characteristics of the low-earth satellite, a fixed ground area may cause a base station to change due to the movement of the satellite. Therefore, even if the terminal does not move, the terminal needs to be handed over from the currently accessed low-earth satellite to another satellite after a while. Considering the continuous variation of the coverage of the low-earth orbit satellite, if the satellite base station supports the work according to the traditional measurement reporting, switching decision and switching execution, the satellite base station needs to process a large number of switching measurement and switching decision processes, thereby increasing the energy consumption of the terminal and the base station.
Based on this, the embodiment of the invention provides a switching scheme, so that the satellite base station periodically triggers the switching process of the terminal group according to the position and the coverage condition of the terminal, thereby reducing the switching overhead and improving the system efficiency.
The following describes embodiments of the present invention with reference to the drawings.
Fig. 3 is a schematic diagram of an implementation flow of a handover method of a terminal, as shown in the figure, the implementation flow may include:
and step 302, when the switching period is reached, switching the terminal in the overlapping coverage area between the first satellite base station and the second satellite base station from the first satellite base station to the second satellite base station.
Specifically, since the moving speed of the ordinary terrestrial terminal can be regarded as relatively stationary with respect to the moving speed of the satellite beam, the satellite can determine the timing of the handover for these terminals according to the location distribution and the beam coverage.
In an implementation, determining a handover period in which the neighboring first satellite base station and the second satellite base station perform the periodic handover includes:
determining an overlapping coverage area between adjacent first and second satellite base stations;
and determining the period of the periodic switching according to the moving speed and the overlapping coverage area of the first satellite base station and the second satellite base station.
Specifically, taking the width of the coverage area as an example to determine the period of the periodic switching, the following may be used:
acquiring the overlapping coverage area of adjacent satellite base stations, and calculating the width of the overlapping coverage area;
calculating a switching period according to the moving speed of the satellite and the width of the overlapping coverage area;
and acquiring the position information of the terminal, and uniformly executing the switching process to the next satellite base station when the switching period arrives, wherein the terminal corresponds to the terminal in the overlapped coverage area.
The following description is made with reference to an example implemented mainly in the width of the coverage.
Example 1
The manner of the switching period calculation is mainly explained in this example.
In implementation, the overlapping coverage area between two adjacent satellite base stations is determined according to the coverage area of the static configuration of the satellite base stations or the wireless coverage parameter configuration of the adjacent satellite base stations.
Specifically, the handover period needs to be calculated according to the moving speed of the satellite and the overlapping coverage of the adjacent satellite base stations. There are at least two ways for the current satellite base station to obtain the size of the overlapping coverage area between adjacent base stations:
1. statically configured coverage or wireless coverage parameter configuration of neighboring satellite base stations, such as antenna angle, which requires the satellite to calculate the width of the overlapping area by itself;
2. the management system transmits the coverage of the overlapping coverage areas to the satellite base stations.
Fig. 4 is a schematic diagram of the period calculation, and as shown in the figure, the switching period T < ═ d/v can be calculated according to the width d of the overlapping coverage area and the moving speed v of the satellite, which at least ensures that the switching process does not need to be triggered separately for the stationary terminal.
Example 2
The operation flow of the periodic switching is explained in this example.
Fig. 5 is a schematic diagram of a periodic handover process, which may include the following steps:
and step 501, acquiring the overlapping coverage width and the moving speed of the satellite base station.
Each satellite base station acquires the width of the overlapping coverage area of the next satellite opposite to the self movement direction and the movement speed of the next satellite and the satellite.
And the satellite base station checks whether the width of the overlapped coverage area and the self moving speed change relative to the last period calculation, if so, the switching period is recalculated, and otherwise, the previously calculated period T is reused.
And step 504, starting a periodic timer, and determining the terminal positioned in the overlapping coverage area according to the position of the terminal after the period T.
And the satellite base station starts a switching timer according to the period T, and after the timer is overtime, the satellite base station determines the terminal in the overlapping coverage area according to the position of the terminal and the overlapping coverage area.
And 505, executing a switching process for the terminal in the overlapping coverage area.
For terminals located in the overlapping coverage area, the satellite base station performs a handover procedure to handover all terminals located in the overlapping coverage area to an adjacent next satellite base station providing the overlapping coverage.
The satellite base station repeats the above steps, thereby periodically performing the handover of the multi-terminal.
Example 3
In this example, group switching based on the Xn interface is explained. The group switching means that the source base station realizes switching by sending a switching signaling of a group of terminals at a time on the network side for a switching request initiated by a group of terminals, and the mode can avoid repeatedly sending the switching signaling for each terminal on an inter-satellite link or a feed link.
In operation, a terminal in an overlapping coverage area is handed over from a first satellite base station to a second satellite base station based on a group handover over an Xn interface.
Fig. 6 is a schematic diagram of a group handover process based on an Xn interface, where as shown in the figure, after the Source base station (Source gNB) determines to perform a handover process on a terminal in an overlapping coverage area, the method may include:
and 601, the source base station periodically triggers the switching.
Step 602, the source base station sends a switching request list to the Target base station (Target gNB).
As the source base station starts the timer T after sending the Handover Request message to the target warfareRELOCprepIf T isRELOCprepIf the time is out, the source base station will cancel the preparation process of the switching, and the switching will fail, so the source base station starts the switching process for all the terminals and sends a plurality of switching requests to the target base station at the same time. In order to make the target base station have sufficient response time, the handover preparation timer T set at the source base station side may be usedRELOCprepAnd prolonging the value, wherein the value length is related to the number of the terminals to be switched, which is determined by the source base station. That is, in an implementation, when the terminal in the overlapping coverage area is handed over from the first satellite base station to the second satellite base station, the method may further include:
switching preparation timer T for source base station side according to number of terminals to be switchedRELOCprepExtended value of said TRELOCprepThe extended value is used to ensure that the target base station has a response time.
And 603, the target base station returns a switching request response list to the source base station.
And after the target base station processes the switching request in batch, returning to the switching response list. Similarly, in order to enable a group of terminals to successfully access the target base station, the timer started by the target base station needs to be set for a longer time.
And 604, randomizing and sending a switching command.
And the source base station decides to send the switching command to each terminal according to the switching response, and the time window for sending the switching command by the source base station needs to be randomized in order to avoid simultaneous switching of a large number of terminals. That is, in the implementation, when the terminal in the overlapping coverage area is handed over from the first satellite base station to the second satellite base station, the method may further include:
when the switching command is sent to each terminal needing to be switched, the time window for sending the switching command is randomized.
Step 605, the terminal performs target cell synchronization.
After receiving the handover command, the terminal may perform a synchronization procedure to the target cell according to the existing procedure.
Step 606, the target base station performs path switching.
For a terminal synchronized to a target base station, the target base station may perform a path switching process to a core network according to a prior art procedure, and request a source base station to release a UE (User Equipment) context.
Example 4
In this example, group switching based on the NG interface is explained.
In an implementation, the handover of the terminal in the overlapping coverage area from the first satellite base station to the second satellite base station is based on a group handover of the NG interface.
If the Xn interface is not supported between the base stations, the terminal can initiate the switching based on the NG interface. The difference between the process and Xn handover is mainly that the source base station sends the handover request list to the AMF (Authentication Management Function), and the AMF processes the handover requests one by one, and the processing flow can be the same as that in the prior art.
Example 5
In this example, a process when the terminal moves out of the current satellite base station in the handover period will be described.
Before the next handover period has not yet been reached, the terminal may move to cause a handover to the next satellite base station in the opposite direction to the satellite movement. In the switching period, if the terminal is going to move out of the coverage of the current satellite, the terminal still needs to send the measurement report information to the satellite base station, and at this time, the satellite base station executes an independent switching process for the terminal.
In the implementation, the method may further include:
and in a switching period, when determining that a terminal moves out of an overlapped coverage area, triggering a switching process for the terminal. Since the flight speed of a satellite is typically much greater than the terminal speed, moving a terminal out of an overlapping coverage area in an implementation refers to the terminal moving out of the coverage area of a current first satellite and into the coverage area of a second satellite base station.
In a specific implementation, determining that there is a terminal to move out of the overlapping coverage area may include:
indicating the satellite base station to carry an indication for the terminal to judge whether to move out of the overlapping coverage area in the system broadcast;
and after the terminal determines to move out of the overlapping coverage area according to the indication and reports the measurement report, determining that the terminal moves out of the overlapping coverage area.
Specifically, in order to avoid that the terminal continuously reports the measurement report, the satellite base station can carry an indication in the system broadcast message, obviously the problem can be abstracted to a map coloring problem, and according to the four-color guess, the indication of 2bit at most is used in the system broadcast message, so that the terminal can distinguish whether to move out of the beam coverage of the current satellite base station. At this time, the terminal may report a measurement report to trigger a handover procedure.
If the terminal sends the measurement report, the base station switches the terminal to the next satellite base station according to the existing switching process;
example 6
In this example, the following describes the handover of a UE to the next satellite base station by conditional handover. The conditional handover refers to a condition that the network instructs the terminal to perform target cell synchronization when sending a handover command to the UE, for example, handover is performed when time, cell signal strength, and the like satisfy the condition.
In an implementation, after determining the overlapping coverage area, the method may further include:
conditional switching is used to hand off terminals in overlapping coverage areas from one satellite base station to another.
Specifically, after the source base station determines the terminal located in the overlapping coverage area, the source base station may initiate a conditional handover procedure, that is, the handover procedure in embodiment 3, where the source base station carries a handover condition in a handover command, for example, when the terminal detects that it is going to move out of the coverage of the current satellite base station according to embodiment 5, the terminal performs handover to the next satellite base station.
Fig. 7 is a schematic diagram of a conditional handover process, which may include:
and step 701, the source base station periodically triggers switching.
Step 702, the source base station sends a switching request list to the Target base station (Target gNB).
And 703, the target base station returns a switching request response list to the source base station.
Step 704, the source base station sends the switching command with the switching condition to the terminal.
Step 705, the terminal performs target cell synchronization.
Step 706, the target base station performs path switching.
The specific flow of this example is similar to that of embodiment 3, but the terminal does not immediately execute the target cell synchronization process after receiving the handover command, but waits for the handover condition to be satisfied and then executes synchronization to the target cell.
In this embodiment, although the base station performs the periodic handover, the UE may be instructed to perform the condition of target cell synchronization in the handover command, for example, after a specified time period (if the satellite can be located at the terminal position, the time point of the target cell synchronization performed by the terminal may be determined according to the satellite orbit information, the satellite beam and the terminal position), the handover is initiated, that is, the handover is initiated after the set condition is satisfied.
Based on the same inventive concept, the embodiment of the present invention further provides a switching apparatus and a storage medium for a satellite base station and a terminal, and because the principles of solving the problems of these devices are similar to the switching method of the terminal, the implementation of these devices can refer to the implementation of the method, and repeated details are not repeated.
When the technical scheme provided by the embodiment of the invention is implemented, the implementation can be carried out as follows.
Fig. 8 is a schematic structural diagram of a satellite base station, which is a first satellite base station, and as shown in the figure, the satellite base station includes:
the processor 800, which is used to read the program in the memory 820, executes the following processes:
determining a switching period for executing switching between a first satellite base station and a second satellite base station which are adjacent; when the switching period is reached, switching the terminal in the overlapping coverage area between the first satellite base station and the second satellite base station from the first satellite base station to the second satellite base station;
a transceiver 810 for receiving and transmitting data under the control of the processor 800.
In an implementation, determining a handover period in which the neighboring first satellite base station and the second satellite base station perform the periodic handover includes:
determining an overlapping coverage area between adjacent first and second satellite base stations;
and determining the period of the periodic switching according to the moving speed and the overlapping coverage area of the first satellite base station and the second satellite base station.
In implementation, the overlapping coverage area between two adjacent satellite base stations is determined according to the coverage area of the static configuration of the satellite base stations or the wireless coverage parameter configuration of the adjacent satellite base stations.
In an implementation, handing over a terminal in an overlapping coverage area from a first satellite base station to a second satellite base station, further comprises:
prolonging the value of a switching preparation timer TRELOPrep at the side of a source base station according to the number of terminals to be switched, wherein T isRELOCprepThe extended value is used to ensure that the target base station has a response time.
In an implementation, handing over a terminal in an overlapping coverage area from a first satellite base station to a second satellite base station, further comprises:
when the switching command is sent to each terminal needing to be switched, the time window for sending the switching command is randomized.
In implementation, the terminal in the overlapping coverage area is switched from the first satellite base station to the second satellite base station based on the group switching of the Xn interface; or, it is switched based on the group switching of the NG interface.
In an implementation, the method further comprises the following steps:
and in a switching period, when determining that a terminal moves out of an overlapped coverage area, triggering a switching process for the terminal.
In implementation, determining that there is a terminal to move out of the overlapping coverage area includes:
indicating the satellite base station to carry an indication for the terminal to judge whether to move out of the overlapping coverage area in the system broadcast;
and after the terminal determines to move out of the overlapping coverage area according to the indication and reports the measurement report, determining that the terminal moves out of the overlapping coverage area.
In an implementation, after determining the overlapping coverage area, the method further includes:
conditional switching is used to hand off terminals in overlapping coverage areas from one satellite base station to another.
Where in fig. 8, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 800 and memory represented by memory 820. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 810 may be a number of elements including a transmitter and a transceiver providing a means for communicating with various other apparatus over a transmission medium. The processor 800 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 800 in performing operations.
The embodiment of the invention provides a switching device of a terminal, which comprises:
the system comprises a period determining module, a switching period determining module and a switching control module, wherein the period determining module is used for determining the switching period of the switching between the adjacent first satellite base station and the second satellite base station;
and the switching module is used for switching the terminal in the overlapping coverage area between the first satellite base station and the second satellite base station from the first satellite base station to the second satellite base station when the switching period is reached.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware in practicing the invention.
An embodiment of the present invention provides a computer-readable storage medium storing a computer program for executing the handover method of the terminal.
The specific implementation may refer to implementation of a handover method of a terminal.
In summary, in the technical solution provided in the embodiment of the present invention, after acquiring the overlapping coverage area of the adjacent satellite base station, and according to the moving speed of the satellite and the width of the overlapping coverage area, the switching period is calculated; and then acquiring the position information of the terminal, and uniformly executing the switching process to the next satellite base station when the switching period comes for the terminal in the overlapped coverage area.
Further, there is also provided: in a switching period, if the terminal is going to move out of the coverage of the current satellite, the terminal still needs to send measurement report information to a satellite base station, and the satellite base station executes an independent switching process for the terminal; in the switching process, the base station indicates the switching condition to the terminal, so that the terminal executes the switching process after meeting the switching condition. The condition is that the terminal is about to leave the coverage of the current satellite base station; the terminal determines the coverage of leaving the current satellite according to the system broadcast message; in the switching process, the time for the base station to issue the switching command needs to be randomized.
By adopting the technical scheme provided by the embodiment of the invention, a large number of measurement reports and frequent switching decision processes aiming at each UE can be reduced.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (18)
1. A method for switching a terminal, comprising:
determining a switching period for executing switching between a first satellite base station and a second satellite base station which are adjacent;
when the switching period is reached, switching the terminal in the overlapping coverage area between the first satellite base station and the second satellite base station from the first satellite base station to the second satellite base station;
handing off a terminal within the overlapping coverage area from the first satellite base station to the second satellite base station, further comprising:
when the switching command is sent to each terminal needing to be switched, the time window for sending the switching command is randomized.
2. The method of claim 1, wherein determining a handover period during which the neighboring first satellite base station performs the periodic handover with the second satellite base station comprises:
determining an overlapping coverage area between adjacent first and second satellite base stations;
and determining the period of the periodic switching according to the moving speed and the overlapping coverage area of the first satellite base station and the second satellite base station.
3. The method of claim 2, wherein determining the overlapping coverage area between two adjacent satellite base stations is determined according to statically configured coverage of the satellite base stations or radio coverage parameter configuration of the adjacent satellite base stations.
4. The method of claim 1, wherein handing off a terminal in an overlapping coverage area from a first satellite base station to a second satellite base station, further comprising:
switching preparation timer T for source base station side according to number of terminals to be switchedRELOCprepExtended value of said TRELOCprepThe extended value is used to ensure that the target base station has a response time.
5. The method of claim 1, wherein handing off a terminal in an overlapping coverage area from a first satellite base station to a second satellite base station is handed off based on a group handoff over an Xn interface; or, it is switched based on the group switching of the NG interface.
6. The method of any of claims 1 to 5, further comprising:
and in a switching period, when determining that a terminal moves out of an overlapped coverage area, triggering a switching process for the terminal.
7. The method of claim 6, wherein determining that a terminal will move out of an overlapping coverage area comprises:
indicating the satellite base station to carry an indication for the terminal to judge whether to move out of the overlapping coverage area in the system broadcast;
and after receiving a report that the terminal determines to move out of the overlapping coverage area according to the indication, determining that the terminal moves out of the overlapping coverage area.
8. The method of any of claims 1 to 5, further comprising, after determining the overlapping coverage area:
conditional switching is used to hand off terminals in overlapping coverage areas from one satellite base station to another.
9. A satellite base station, wherein the satellite base station is a first satellite base station, comprising:
a processor for reading the program in the memory, performing the following processes:
determining a switching period for executing switching between a first satellite base station and a second satellite base station which are adjacent; when the switching period is reached, switching the terminal in the overlapping coverage area between the first satellite base station and the second satellite base station from the first satellite base station to the second satellite base station;
a transceiver for receiving and transmitting data under the control of the processor;
handing off a terminal within the overlapping coverage area from the first satellite base station to the second satellite base station, further comprising:
when the switching command is sent to each terminal needing to be switched, the time window for sending the switching command is randomized.
10. The satellite base station of claim 9, wherein determining a handover period during which the first satellite base station and the second satellite base station that are adjacent to each other perform the periodic handover comprises:
determining an overlapping coverage area between adjacent first and second satellite base stations;
and determining the period of the periodic switching according to the moving speed and the overlapping coverage area of the first satellite base station and the second satellite base station.
11. The satellite base station of claim 10, wherein determining the overlapping coverage area between two adjacent satellite base stations is based on statically configured coverage of the satellite base stations or radio coverage parameter configuration of the adjacent satellite base stations.
12. The satellite base station of claim 9, wherein a terminal in an overlapping coverage area is handed over from a first satellite base station to a second satellite base station, further comprising:
switching preparation timer T for source base station side according to number of terminals to be switchedRELOCprepExtended value of said TRELOCprepThe extended value is used to ensure that the target base station has a response time.
13. The satellite base station of claim 9, wherein handing off a terminal in an overlapping coverage area from a first satellite base station to a second satellite base station is based on a group handoff of an Xn interface; or, it is switched based on the group switching of the NG interface.
14. The satellite base station of any of claims 9 to 13, further comprising:
and in a switching period, when determining that a terminal moves out of an overlapped coverage area, triggering a switching process for the terminal.
15. The satellite base station of claim 14, wherein determining that a terminal will move out of an overlapping coverage area comprises:
indicating the satellite base station to carry an indication for the terminal to judge whether to move out of the overlapping coverage area in the system broadcast;
and after the terminal determines to move out of the overlapping coverage area according to the indication and reports the measurement report, determining that the terminal moves out of the overlapping coverage area.
16. The satellite base station of any of claims 9 to 13, further comprising, after determining the overlapping coverage area:
conditional switching is used to hand off terminals in overlapping coverage areas from one satellite base station to another.
17. A handover apparatus of a terminal, comprising:
the system comprises a period determining module, a switching period determining module and a switching control module, wherein the period determining module is used for determining the switching period of the switching between the adjacent first satellite base station and the second satellite base station;
the switching module is used for switching the terminal in the overlapping coverage area between the first satellite base station and the second satellite base station from the first satellite base station to the second satellite base station when the switching period is reached;
handing off a terminal within the overlapping coverage area from the first satellite base station to the second satellite base station, further comprising:
when the switching command is sent to each terminal needing to be switched, the time window for sending the switching command is randomized.
18. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910652089.2A CN112243260B (en) | 2019-07-18 | 2019-07-18 | Terminal switching method, satellite base station, device and medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910652089.2A CN112243260B (en) | 2019-07-18 | 2019-07-18 | Terminal switching method, satellite base station, device and medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112243260A CN112243260A (en) | 2021-01-19 |
| CN112243260B true CN112243260B (en) | 2022-04-01 |
Family
ID=74168051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910652089.2A Active CN112243260B (en) | 2019-07-18 | 2019-07-18 | Terminal switching method, satellite base station, device and medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112243260B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114221693B (en) * | 2021-12-30 | 2022-10-11 | 广州爱浦路网络技术有限公司 | Satellite access control method, system, device and storage medium |
| WO2023216206A1 (en) * | 2022-05-12 | 2023-11-16 | 北京小米移动软件有限公司 | Wireless transmission method and apparatus, and communication device and storage medium |
| CN115766832B (en) * | 2022-09-02 | 2024-06-18 | 北京理工大学 | Beam switching decision method and device for satellite network |
| CN115426667B (en) * | 2022-11-06 | 2023-03-24 | 荣耀终端有限公司 | Processing method and device for switching exception and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101511114A (en) * | 2008-02-15 | 2009-08-19 | 三菱电机株式会社 | Method and a device for determiming if a handover has to be excuted for a terminal |
| CN107800472A (en) * | 2017-11-23 | 2018-03-13 | 中国空间技术研究院 | A kind of method for handover control and system based on resource reservation in satellite network |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004140721A (en) * | 2002-10-21 | 2004-05-13 | Hitachi Ltd | Signal reception method utilizing artificial satellite, service providing method, method of controlling artificial satellite, reception terminal, and controller for artificial satellite |
| US20170019820A1 (en) * | 2015-07-17 | 2017-01-19 | Qualcomm Incorporated | Enhancements for discontinuous reception in wireless communications |
| US10244453B2 (en) * | 2015-10-13 | 2019-03-26 | Qualcomm Incorporated | Method and apparatus for inter-satellite handovers in low-earth orbit (LEO) satellite systems |
| US10361772B2 (en) * | 2017-12-26 | 2019-07-23 | Hughes Network Systems, Llc | Timing synchronization for a beam hopping satellite |
-
2019
- 2019-07-18 CN CN201910652089.2A patent/CN112243260B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101511114A (en) * | 2008-02-15 | 2009-08-19 | 三菱电机株式会社 | Method and a device for determiming if a handover has to be excuted for a terminal |
| CN107800472A (en) * | 2017-11-23 | 2018-03-13 | 中国空间技术研究院 | A kind of method for handover control and system based on resource reservation in satellite network |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112243260A (en) | 2021-01-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112243260B (en) | Terminal switching method, satellite base station, device and medium | |
| US11990980B2 (en) | Handover control method and device | |
| US10827401B2 (en) | Cell handover method, apparatus, and system | |
| CN105704769B (en) | The method and system of handover between cells in base station | |
| US20200396656A1 (en) | Method and apparatus for handover | |
| CN110493830A (en) | Switching method and device | |
| CN111132253B (en) | Joint mobility management method for communication switching and service migration | |
| CN111356185A (en) | Switching control method and equipment | |
| CN109429281B (en) | Service switching method based on dual-connection architecture, terminal and base station | |
| CN102307375B (en) | Switching method and system between different networks and eHRPD network | |
| CN112243277B (en) | Method, equipment and device for switching user equipment of feeder link and home satellite | |
| CN112740754A (en) | Context preparation for continuous conditional switching | |
| CN106358248A (en) | Wireless local area network (WLAN) switching method and device | |
| CN107005957B (en) | Communication method and apparatus | |
| US10993158B2 (en) | Mobile terminal apparatus, base station apparatus, communication system, and communication control method | |
| CN104640165A (en) | Data transmission method, equipment and system | |
| CN114095073A (en) | Seamless switching method in 5G satellite fusion scene | |
| CN104684019A (en) | Measurement information acquisition and transmission methods and devices, and base station equipment | |
| CN102084691A (en) | Method and apparatus for group handover in wireless network | |
| CN108632921B (en) | Core network switching method and device | |
| EP4255021A1 (en) | Methods and apparatus of ta maintenance and acquisition for mobility with inter-cell beam management | |
| CN104507133A (en) | Voice switching method and device | |
| CN110519811A (en) | A kind of LTE base station cell switching method based on S1 interface | |
| US11129060B2 (en) | Handover method and apparatus, and computer storage medium | |
| CN114095980A (en) | Primary cell switching processing method, device and storage medium in conditional secondary cell group |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |