CN111356185A

CN111356185A - Switching control method and equipment

Info

Publication number: CN111356185A
Application number: CN201811574792.8A
Authority: CN
Inventors: 范江胜; 梁靖
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2018-12-21
Filing date: 2018-12-21
Publication date: 2020-06-30

Abstract

The invention relates to the technical field of wireless communication, in particular to a switching control method and equipment, which are used for solving the problems that the conventional switching mechanism causes the switching measurement process of a terminal to be too frequent, greatly increases the energy consumption of the terminal and is not beneficial to saving electricity of the terminal. The terminal determines at least one candidate satellite base station according to satellite orbit diagram information of the satellite base station in the area, and sends a first switching request containing the information of the at least one candidate satellite base station to a source satellite base station which is accessed currently, so that the source satellite base station determines a switching command which is returned to the terminal according to the at least one candidate satellite base station; determining a target satellite base station to be switched to according to a switching command returned by the source satellite base station; and switching from the source satellite base station to the target satellite base station. The embodiment of the invention does not need the terminal to carry out measurement report because of the switching process based on the terminal decision, thereby saving the energy consumption for terminal measurement and the measurement report signaling.

Description

Switching control method and equipment

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a handover control method and apparatus.

Background

The satellite internet has the advantages of wide coverage, small influence by natural disasters and physical attacks and the like. The system can be deeply fused with a ground mobile communication network (5G) network, makes up for the insufficient coverage of the ground mobile network, forms a fused network system with complementary advantages, close fusion and three-dimensional layering with the ground network, and realizes the transmission and interaction of information in the global range.

The satellite internet is divided into a synchronous satellite, a medium orbit satellite and a low orbit satellite; the low-earth satellite distance is characterized by being close to the ground, moderate in communication time delay with a ground terminal, high in moving speed, large in road loss, limited in satellite power and the like.

Because the moving speed of the medium and low orbit satellite is high, even if the terminal does not move relative to the ground, the terminal can lose effective connection with the current service satellite in a short time, and the terminal needs to be frequently switched among different service satellites. In a cellular system, a connected terminal completes the switching from a current service base station to another base station through a measurement reporting mechanism; the measurement reporting mechanism of the terminal is a precondition that the serving base station selects a proper target base station for the terminal, the terminal measures the signal quality of the neighboring base station under the condition that the measurement triggering condition is met according to the measurement configuration of the network side and reports the signal quality to the serving base station in the form of a measurement report, and the serving base station selects one or more proper target base stations to initiate a switching request process for the terminal after comprehensively considering the measurement report reported by the terminal, that is, in a cellular system, the switching process needs to be carried out on the terminal side.

However, in a scenario of a satellite communication network moving at a high speed, since the effective time of a region covered by a low-medium orbit satellite is much shorter than the average time of a terminal for obtaining service in a cell under the background of a cellular network, if a handover mechanism based on terminal measurement reporting in the cellular network is still used, the handover measurement process of the terminal is too frequent, the energy consumption of the terminal is greatly increased, and the terminal is not favorable for saving electricity.

Disclosure of Invention

The invention provides a switching control method and equipment, which are used for solving the problems that the switching measurement process of a terminal is too frequent, the energy consumption of the terminal is greatly increased and the power saving of the terminal is not facilitated due to the existing switching mechanism.

Based on the foregoing problem, in a first aspect, an embodiment of the present invention provides a handover control method, including:

the terminal determines at least one candidate satellite base station according to satellite orbit diagram information of the satellite base station in the region, and sends a first switching request containing the information of the at least one candidate satellite base station to a source satellite base station accessed currently, so that the source satellite base station determines a switching command returned to the terminal according to the at least one candidate satellite base station;

the terminal determines a target satellite base station to be switched to according to a switching command returned by the source satellite base station;

and the terminal is switched from the source satellite base station to the target satellite base station.

Optionally, the terminal determines satellite-orbit diagram information of the satellite base station in the area according to the following modes:

the terminal acquires satellite base station satellite-orbit diagram information of a region where the terminal is located, which is configured in advance during signing; or

The terminal receives satellite base station satellite orbit diagram information of the area where the terminal is located, which is transmitted by the core network equipment forwarded by the source satellite base station; and the satellite orbit diagram information of the satellite base station of the area where the terminal is located is sent by the core network equipment after receiving the request message sent by the terminal through the source satellite base station.

Optionally, the sending, by the terminal, a first handover request including information of at least one candidate satellite base station to a currently accessed source satellite base station includes:

the method comprises the steps that after a terminal acquires satellite orbit diagram information of a satellite base station in an area where the terminal is located, a first switching request containing information of at least one candidate satellite base station is sent to a source satellite base station which is accessed currently; or

The terminal sends a first switching request containing information of at least one candidate satellite base station to a currently accessed source satellite base station when acquiring satellite orbit diagram information of the satellite base station of an area where the terminal is located and determining that the signal quality of the source satellite base station is lower than a first threshold value.

Optionally, after the terminal sends the first handover request including the information of the at least one candidate satellite base station to the currently accessed source satellite base station, before determining the target satellite base station to be handed over to according to the received handover command returned by the source satellite base station, the method further includes:

and the terminal receives a switching command which is returned by the source satellite base station and contains configuration information of at least one alternative target satellite base station.

Optionally, the determining, by the terminal, the target satellite base station to be handed over to according to the handover command returned by the source satellite base station includes:

and the terminal determines the target satellite base station to be switched to according to the configuration information of at least one alternative target satellite base station contained in the switching command.

Optionally, when there are at least two candidate target satellite base stations, the terminal determines the target satellite base station according to the following manner:

and the terminal selects the candidate target satellite base station with the closest distance from the at least two candidate target satellite base stations as the target satellite base station.

Optionally, the switching, by the terminal, the currently accessed source satellite base station to the target satellite base station includes:

the terminal determines a first moment when the target satellite base station covers the area where the terminal is located according to the satellite orbit diagram information of the satellite base station; when the first time arrives, the terminal is switched from the source satellite base station to the target satellite base station; or

The terminal determines a first moment when the target satellite base station covers the area where the terminal is located according to the satellite orbit diagram information of the satellite base station; measuring the signal quality of the target satellite base station within a first preset time before the first time arrives; and after the signal quality of the target satellite base station is greater than a second threshold value, the terminal is switched from the source satellite base station to the target satellite base station.

Optionally, the configuration information of the target satellite base station includes a delay handover duration.

and the terminal sorts the at least two alternative target satellite base stations from small to large according to the delay switching duration, and selects the alternative target satellite base station with the top sorting as the target satellite base station required.

Optionally, after the terminal selects the target satellite base station, before switching from the source satellite base station to the target satellite base station, the method further includes:

and the terminal starts a switching timer after receiving a switching command sent by the source satellite base station, and sets the time length of the switching timer as the delay switching time length corresponding to the selected target satellite base station.

Optionally, the switching, by the terminal, from the source satellite base station to the target satellite base station includes:

at the time when the switching timer is overtime, the terminal is switched from the source satellite base station to the target satellite base station; or

Within a second preset time before the switching timer is overtime, the terminal measures the signal quality of the target satellite base station; switching from the source satellite base station to the target satellite base station after the signal quality of the target satellite base station is greater than a third threshold; or

Before the switching timer is overtime or before a second preset time before the switching timer is overtime, if the signal quality of the source satellite base station is determined to be smaller than a fourth threshold value, the terminal measures the signal quality of the target satellite, and when the signal quality of the target satellite is determined to be larger than a fifth threshold value, the terminal is switched from the source satellite base station to the target satellite base station; or

Before the switching timer is overtime or before a second preset time before the switching timer is overtime, if the signal quality of the source satellite base station is determined to be smaller than a sixth threshold, the terminal measures the signal quality of all the alternative target satellite base stations, and when the measured signal quality of the alternative target satellite base station is larger than a seventh threshold, the source satellite base station is switched to the alternative target satellite base station of which the signal quality is larger than the seventh threshold.

Optionally, the satellite-orbit diagram information of the satellite base station in the area where the terminal is located includes part or all of the following information:

the time information of the satellite base station passing through the area of the terminal, the height of the satellite base station, the moving speed and direction of the satellite base station and the orbit offset angle of the satellite base station.

In a second aspect, an embodiment of the present invention provides a handover control method, where the method includes:

a source satellite base station receives a first switching request which contains information of at least one candidate satellite base station and is sent by a terminal; the at least one candidate satellite base station is determined by the terminal according to satellite-orbit diagram information of the satellite base station in the region;

and the source satellite base station returns a switching command to the terminal according to the at least one candidate satellite base station, so that the terminal determines a target satellite base station to be switched to according to the switching command and switches the target satellite base station from the source satellite base station to the target satellite base station.

Optionally, the returning, by the source satellite base station, a handover command to the terminal according to the at least one candidate satellite base station includes:

the source satellite base station determines at least one alternative target satellite base station which can be switched by the terminal according to the at least one alternative satellite base station;

and the source satellite base station returns a switching command containing configuration information of at least one alternative target satellite base station to the terminal.

Optionally, the determining, by the source satellite base station, at least one candidate target satellite base station to which the terminal can be handed over according to the at least one candidate satellite base station includes:

the source satellite base station transmitting a second handover request to the at least one candidate satellite base station;

the source satellite base station receives a switching confirmation message returned by the candidate satellite base station; the switching confirmation message is sent after the candidate satellite base station determines that the switching request can be received according to the self load or a preset constraint condition;

and the source satellite base station takes at least one candidate satellite base station returning the switching confirmation message as a candidate target satellite base station according to a local strategy.

In a third aspect, an embodiment of the present invention provides an information obtaining method, where the method includes:

the method comprises the steps that core network equipment receives a request message sent by a terminal through a source satellite base station which is accessed currently;

and the core network equipment forwards satellite base station satellite-orbit diagram information of the area where the terminal is located to the terminal through the source satellite base station.

Optionally, the method further includes:

the core network equipment receives an indication of a data management center;

and the core network equipment updates the satellite-orbit diagram information of the satellite base station stored locally according to the indication of the data management center.

In a fourth aspect, an embodiment of the present invention provides a terminal, including a processor, a memory, and a transceiver;

wherein the processor is configured to read a program in the memory and execute:

determining at least one candidate satellite base station according to satellite orbit diagram information of the satellite base station in the region, and sending a first switching request containing the information of the at least one candidate satellite base station to a currently accessed source satellite base station so that the source satellite base station determines a switching command returned to the terminal according to the at least one candidate satellite base station;

determining a target satellite base station to be switched to according to a switching command returned by the source satellite base station;

and switching from the source satellite base station to the target satellite base station.

Optionally, the processor is specifically configured to:

determining satellite-orbit diagram information of the satellite base station in the area according to the following modes:

acquiring satellite base station satellite-orbit diagram information of a region where a terminal is located, which is configured in advance during signing; or

Receiving satellite base station satellite-orbit diagram information of the area where the terminal is located, which is transmitted by the core network equipment forwarded by the source satellite base station; and the satellite orbit diagram information of the satellite base station of the area where the terminal is located is sent by the core network equipment after receiving the request message sent by the terminal through the source satellite base station.

Optionally, the processor is specifically configured to:

after satellite orbit diagram information of a satellite base station of a region where a terminal is located is obtained, a first switching request containing information of at least one candidate satellite base station is sent to a source satellite base station which is accessed currently; or

And when satellite orbit map information of a satellite base station in the area of the terminal is acquired and the signal quality of the source satellite base station is determined to be lower than a first threshold value, sending a first switching request containing information of at least one candidate satellite base station to the currently accessed source satellite base station.

Optionally, the processor is further configured to:

after a first switching request containing information of at least one candidate satellite base station is sent to a source satellite base station which is accessed currently, a switching command containing configuration information of at least one candidate target satellite base station returned by the source satellite base station is received before a target satellite base station which needs to be switched is determined according to the received switching command returned by the source satellite base station.

Optionally, the processor is specifically configured to:

and determining the target satellite base station needing to be switched to according to the configuration information of at least one alternative target satellite base station contained in the switching command.

Optionally, the processor is specifically configured to:

when at least two candidate target satellite base stations exist, determining the target satellite base station according to the following modes:

and selecting the candidate target satellite base station with the closest distance from the at least two candidate target satellite base stations as the target satellite base station.

Optionally, the processor is specifically configured to:

determining a first moment when the target satellite base station covers the area where the terminal is located according to the satellite orbit diagram information of the satellite base station; when the first time arrives, the terminal is switched from the source satellite base station to the target satellite base station; or

Determining a first moment when the target satellite base station covers the area where the terminal is located according to the satellite orbit diagram information of the satellite base station; measuring the signal quality of the target satellite base station within a first preset time before the first time arrives; and after the signal quality of the target satellite base station is greater than a second threshold value, the terminal is switched from the source satellite base station to the target satellite base station.

Optionally, the processor is specifically configured to:

and sequencing the at least two alternative target satellite base stations from small to large according to the delay switching duration, and selecting the alternative target satellite base station with the highest sequencing as the target satellite base station to be required.

Optionally, the processor is further configured to:

after the target satellite base station is selected, before the source satellite base station is switched to the target satellite base station, a switching timer is started after a switching command sent by the source satellite base station is received, and the time length of the switching timer is set to be the delay switching time length corresponding to the selected target satellite base station.

Optionally, the processor is specifically configured to:

switching from the source satellite base station to the target satellite base station at the timeout moment of the switching timer; or

Measuring the signal quality of the target satellite base station within a second preset time before the switching timer is overtime; switching from the source satellite base station to the target satellite base station after the signal quality of the target satellite base station is greater than a third threshold; or

Before the switching timer is overtime or before a second preset time before the switching timer is overtime, if the signal quality of the source satellite base station is determined to be smaller than a fourth threshold value, the signal quality of the target satellite is measured, and when the signal quality of the target satellite is determined to be larger than a fifth threshold value, the terminal is switched from the source satellite base station to the target satellite base station; or

Before the switching timer is overtime or before a second preset time before the switching timer is overtime, if the signal quality of the source satellite base station is determined to be smaller than a sixth threshold value, the signal quality of all the alternative target satellite base stations is measured, and when the measured signal quality of the alternative target satellite base station is larger than a seventh threshold value, the source satellite base station is switched to the alternative target satellite base station of which the signal quality is larger than the seventh threshold value.

In a fifth aspect, a source satellite base station according to an embodiment of the present invention includes a processor, a memory, and a transceiver;

receiving a first switching request which is sent by a terminal and contains information of at least one candidate satellite base station; the at least one candidate satellite base station is determined by the terminal according to satellite-orbit diagram information of the satellite base station in the region;

and returning a switching command to the terminal according to the at least one candidate satellite base station, so that the terminal determines a target satellite base station to be switched to according to the switching command and switches the target satellite base station from the source satellite base station to the target satellite base station.

Optionally, the processor is specifically configured to:

determining at least one candidate target satellite base station which can be switched by the terminal according to the at least one candidate satellite base station; and returning a switching command containing the configuration information of at least one alternative target satellite base station to the terminal.

Optionally, the processor is specifically configured to:

transmitting a second handover request to the at least one candidate satellite base station;

receiving a switching confirmation message returned by the candidate satellite base station; the switching confirmation message is sent after the candidate satellite base station determines that the switching request can be received according to the self load or a preset constraint condition;

and taking at least one candidate satellite base station returning the switching confirmation message as a candidate target satellite base station according to a local strategy.

In a sixth aspect, an embodiment of the present invention provides a core network device, including a processor, a memory, and a transceiver;

receiving a request message sent by a terminal through a source satellite base station which is accessed currently;

and forwarding the satellite orbit diagram information of the satellite base station of the area where the terminal is located to the terminal through the source satellite base station.

Optionally, the processor is further configured to:

receiving an indication of a data management center;

and updating the satellite-orbit diagram information of the satellite base station stored locally according to the indication of the data management center.

In a seventh aspect, an embodiment of the present invention provides a terminal, including:

the first determining module is used for determining at least one candidate satellite base station according to satellite orbit diagram information of the satellite base station in the region, and sending a first switching request containing the information of the at least one candidate satellite base station to a currently accessed source satellite base station so that the source satellite base station determines a switching command returned to the terminal according to the at least one candidate satellite base station;

the second determining module is used for determining a target satellite base station to be switched to according to a switching command returned by the source satellite base station;

and the processing module is used for switching from the source satellite base station to the target satellite base station.

In an eighth aspect, an embodiment of the present invention provides a source satellite base station, including:

the first receiving module is used for receiving a first switching request which contains at least one candidate satellite base station information and is sent by a terminal; the at least one candidate satellite base station is determined by the terminal according to satellite-orbit diagram information of the satellite base station in the region;

and the first sending module is used for returning a switching command to the terminal according to the at least one candidate satellite base station so that the terminal determines a target satellite base station to be switched to according to the switching command and switches the source satellite base station to the target satellite base station.

In a ninth aspect, an embodiment of the present invention provides a core network device, including:

the second receiving module is used for receiving a request message sent by the terminal through the currently accessed source satellite base station;

and the second sending module is used for forwarding the satellite base station satellite-orbit diagram information of the area where the terminal is located to the terminal through the source satellite base station.

In a tenth aspect, embodiments of the present invention provide a computer-readable medium, on which a computer program is stored, which when executed by a processor implements the steps of the method as described in the first aspect above, or implements the steps of the method as described in the second aspect above, implementing the steps of the method as described in the third aspect above.

Because the embodiment of the invention is based on the switching process of the terminal decision, the terminal is not required to carry out measurement report, thereby saving the energy consumption of the terminal measurement and the signaling of the measurement report; on the other hand, the target satellite selected by the terminal according to the satellite coverage satellite orbit diagram information of the region is more stable, the problem of inaccurate switching caused by large fluctuation of the target satellite signal in the measurement switching process is solved, and the terminal is possibly switched to a satellite far away from the region only based on the measurement signal quality, so that new switching is generated in the terminal subsequently and quickly. Obviously, if the terminal can accurately predict the optimal switching target satellite set according to the satellite coverage star orbit diagram information, the terminal is enabled to reduce unnecessary switching processes.

Drawings

FIG. 1 is a system architecture diagram according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a switching control system according to an embodiment of the present invention;

FIG. 3 is a flowchart of a terminal acquiring satellite-orbit diagram information of a satellite base station in an area according to an embodiment of the present invention;

FIG. 4 is a flowchart illustrating handover control according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a first terminal according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a first source satellite base station according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a first core network device according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a second terminal according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a second source satellite base station according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a second core network device according to an embodiment of the present invention;

fig. 11 is a flowchart of a first handover control method according to an embodiment of the present invention;

FIG. 12 is a flowchart illustrating a second handover control method according to an embodiment of the present invention;

fig. 13 is a flowchart of an information acquisition method according to an embodiment of the present invention.

Detailed Description

Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

(1) In the embodiments of the present application, the terms "network" and "system" are often used interchangeably, but those skilled in the art can understand the meaning.

(2) In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.

(3) "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

The network architecture and the service scenario described in the embodiment of the present invention are for more clearly illustrating the technical solution of the embodiment of the present invention, and do not form a limitation on the technical solution provided in the embodiment of the present invention, and it can be known by those skilled in the art that the technical solution provided in the embodiment of the present invention is also applicable to similar technical problems along with the evolution of the network architecture and the appearance of a new service scenario.

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present invention will be described in further detail below with reference to the accompanying drawings.

Fig. 1 illustrates a schematic diagram of a system architecture suitable for an embodiment of the present invention, as shown in fig. 1, in a future 5G system architecture, a terminal 101 may communicate with a core network via an access network entity 102, and the terminal may refer to a UE, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent or a user equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication capabilities, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal in a future 5G network, etc. For convenience of description, fig. 1 only illustrates 1 terminal, and in an actual network, multiple terminals may coexist, which is not described herein again.

AN Access Network (AN) entity 102, which may also be referred to as a Radio Access Network (R) entity, hereinafter referred to as AN Access Network entity (R) AN entity, is mainly responsible for providing a wireless connection for the terminal 101, and ensuring reliable transmission of uplink and downlink data of the terminal 101. The Access network entity 102 may be a next generation Base Station (gNB) in a 5G System, may be a Base Transceiver Station (BTS) in a Global System for mobile communications (GSM) System or a Code Division Multiple Access (CDMA) System, may also be a Base Station (NodeB, NB) in a Wideband Code Division Multiple Access (WCDMA) System, may also be an evolved Node B (eNB or eNodeB) in a Long Term Evolution (LTE) System, and the like, and optionally, the Access network entity in the embodiment of the present invention is a satellite Base Station.

The core network device 103 is responsible for connecting the terminal device to different networks according to a call request or a data request sent by the terminal device through an access network, and performing charging, mobility management and the like. The Core network device may be an Evolved Packet Core (EPC) of a 4G Core network or a 5G Core network device.

It should be noted that the above system architecture is only an example of the system architecture applicable to the embodiment of the present invention, and the system architecture applicable to the embodiment of the present invention may also add other entities or reduce part of the entities compared to the system architecture shown in fig. 1.

The embodiment of the invention is applied to a satellite communication network scene, and in the scene, an access network entity providing service for a terminal is a satellite base station; and a satellite communication network scenario includes a plurality of satellite base stations that move at high speed along a fixed orbit. The moving speed of the terminal is very low compared with the satellite base station, and the most important factor for whether the terminal is switched is not the movement of the terminal itself but the movement of the satellite base station.

Moreover, because the orbit of the satellite base station is fixed, the coverage behavior of the satellite base station in the area where the terminal is located is regularly circulated, and after the terminal acquires the satellite orbit diagram information (or can be called as the satellite orbit diagram information) of the satellite base station, the terminal can automatically judge the satellite base station which needs to be accessed at a certain moment, so that the terminal can actively trigger the switching process according to the satellite orbit diagram information of the satellite base station without frequently measuring the current service base station and the adjacent base stations, and the energy consumption of the terminal is reduced.

As shown in fig. 2, the handover control system according to the embodiment of the present invention includes: a terminal 10, a source satellite base station 11 and a core network device 12.

Wherein, the source satellite base station is the current service base station of the terminal.

The terminal 10 is configured to determine at least one candidate satellite base station according to satellite-orbit diagram information of a satellite base station in an area where the terminal is located, and send a first handover request including information of the at least one candidate satellite base station to a currently accessed source satellite base station, so that the source satellite base station determines a handover command to be returned to the terminal according to the at least one candidate satellite base station; determining a target satellite base station to be switched to according to a switching command returned by the source satellite base station; and switching from the source satellite base station to the target satellite base station.

The source satellite base station 11 is used for receiving a first switching request which is sent by a terminal and contains at least one candidate satellite base station information; the at least one candidate satellite base station is determined by the terminal according to satellite-orbit diagram information of the satellite base station in the region; and returning a switching command to the terminal according to the at least one candidate satellite base station, so that the terminal determines a target satellite base station to be switched to according to the switching command and switches the target satellite base station from the source satellite base station to the target satellite base station.

The core network device 12 is configured to, after receiving a request message sent by a terminal through a currently accessed source satellite base station, forward satellite base station satellite trajectory map information of an area where the terminal is located to the terminal through the source satellite base station.

The terminal in the switching control system provided by the embodiment of the invention can determine at least one candidate satellite base station according to the satellite orbit diagram information of the satellite base station in the area; the candidate satellite base stations are satellite base stations which are determined by the terminal and are possibly accessed in the next switching process, and after at least one candidate satellite base station is determined, a first switching request message is sent to the source satellite base station; and after receiving a switching command returned by the source satellite base station, determining a target satellite base station to which the terminal needs to be switched according to the switching command, and switching from the source satellite base station to the target satellite base station. The embodiment of the invention provides a terminal active triggering switching process, which does not need to frequently measure a current service base station and an adjacent base station, thereby simplifying the switching process and reducing the energy consumption of the terminal.

mode 1, a terminal acquires satellite base station satellite-orbit diagram information of a region where the terminal is pre-configured during signing;

mode 2, the terminal receives satellite base station satellite orbit diagram information of the area where the terminal is located, which is transmitted by the core network equipment forwarded by the source satellite base station; and the satellite orbit diagram information of the satellite base station of the area where the terminal is located is sent by the core network equipment after receiving the request message sent by the terminal through the source satellite base station.

Aiming at the mode 1, the terminal stores satellite base station satellite-orbit diagram information pre-configured by a network side when signing; the terminal acquires satellite-orbit diagram information of the satellite base station in the area from the stored satellite-orbit diagram information of the satellite base station configured in advance.

Aiming at the mode 2, the terminal sends a request message to the source satellite base station for requesting satellite base station satellite-orbit diagram information of the area; the source satellite base station forwards the request message to core network equipment, and the core network equipment sends satellite base station satellite-orbit diagram information of the area where the terminal is located to the terminal through the source satellite base station;

in an optional implementation manner, the terminal sends a request message to the source satellite base station in a registration process; another optional implementation manner is that the terminal sends a request message to the source satellite base station after needing satellite orbit diagram information of the satellite base station in the region.

It should be noted that, the satellite base station satellite-orbit diagram information of all regions is stored in the core network device, and after receiving the request message sent by the terminal, the satellite base station satellite-orbit diagram information of the region where the terminal is located is sent to the terminal; in addition, satellite orbit diagram information of the satellite base station stored inside the core network is not fixed and unchangeable, and the core network equipment can update the satellite orbit diagram information of the satellite base station stored locally;

in implementation, the core network device updates the locally stored satellite base station satellite-orbit diagram information according to the following modes:

the core network equipment receives an indication of a data management center; and updating the satellite-orbit diagram information of the satellite base station stored locally according to the indication of the data management center.

The following describes a flowchart of acquiring satellite-orbit diagram information of a satellite base station in an area by a terminal according to an embodiment of the present invention with reference to fig. 3.

Step 301, the terminal sends a request message for requesting satellite base station satellite trajectory map information of the region to the source satellite base station.

Step 302, the source satellite base station forwards the request message to the core network device.

Step 303, the core network device sends the satellite orbit diagram information of the satellite base station in the area where the terminal is located to the source satellite base station.

And step 304, the source satellite base station forwards satellite orbit diagram information of the satellite base station in the area of the terminal to the terminal.

After acquiring satellite orbit diagram information of a satellite base station in the area, the terminal determines candidate satellite base stations according to the satellite orbit diagram information of the satellite base station in the area; the candidate satellite base stations are the satellite base stations which are possibly accessed by the terminal next along with the movement of the satellite base stations.

For example, a source satellite base station currently accessed by the terminal is a base station A, and along with the movement of the satellite base station, the terminal determines that the terminal is located in the coverage range of the base station A within a time period from t0 to t1 according to satellite base station satellite-orbit diagram information of an area where the terminal is located, and the base station B covers the area where the terminal is located within a time period from t1 to t 2; the terminal may take base station B as a candidate satellite base station.

It should be noted that the above manner in which the terminal determines the candidate satellite base station is merely an illustration of the embodiment of the present invention, and other manners may also be adopted in the embodiment of the present invention to determine the candidate satellite base station according to the satellite trajectory diagram information of the satellite base station in the area where the terminal is located.

Alternatively, the terminal may send the first handover request to the source satellite base station at the following occasions:

1. after acquiring satellite orbit diagram information of a satellite base station in an area where the terminal is located, the terminal sends a first switching request containing information of at least one candidate satellite base station to a currently accessed source satellite base station;

specifically, after the terminal obtains satellite orbit diagram information of a satellite base station in an area where the terminal is located, at least one candidate satellite base station is determined, and then a first switching request is immediately sent to a source satellite base station.

2. The method comprises the steps that when a terminal acquires satellite orbit diagram information of a satellite base station in an area where the terminal is located and the signal quality of a source satellite base station is determined to be lower than a first threshold value, a first switching request containing information of at least one candidate satellite base station is sent to the source satellite base station which is accessed currently;

specifically, after acquiring satellite orbit diagram information of a satellite base station in an area, a terminal measures the signal quality of a currently accessed source satellite base station, and sends a first switching request to the source satellite base station after determining that the signal quality of the source satellite base station is lower than a first threshold value.

After the source satellite base station receives the first switching request, at least one candidate target satellite base station which can be switched by the terminal is determined according to at least one candidate satellite base station in the first switching request, and a switching command containing configuration information of the at least one candidate target satellite base station is returned to the terminal.

Optionally, the source satellite base station determines the candidate target satellite base station according to the following steps:

step 1, the source satellite base station sends a second switching request to the at least one candidate satellite base station;

specifically, when the first handover request sent by the terminal includes at least two candidate satellite base stations, the source satellite base station sends a second handover request to each candidate satellite base station through the inter-satellite interface.

Step 2, receiving a switching confirmation message returned by the candidate satellite base station; the switching confirmation message is sent after the candidate satellite base station determines that the switching request can be received according to the self load or a preset constraint condition;

specifically, after receiving a second handover request sent by the source satellite base station, the candidate satellite base station determines whether to accept the access of the terminal according to the self load condition or some preset constraint conditions; when the admission is determined to be available, returning a switching confirmation message to the source satellite base station through the inter-satellite interface; and when the terminal cannot be accepted, returning a switching refusing message to the source satellite base station through the inter-satellite interface.

Step 3, according to a local strategy, taking at least one candidate satellite base station returning a switching confirmation message as a candidate target satellite base station;

in implementations, the source satellite base station may determine the alternate target satellite base station based on a variety of local strategies. For example, according to the effective service duration of the satellite base station in the local area, the satellite base station with longer service duration is preferentially considered as the alternative target satellite base station; or according to the waiting time length required before the terminal initiates the switching, the satellite base station with smaller switching waiting time length is preferentially considered as the alternative target satellite base station; or the service duration of the satellite base station and the terminal switching waiting duration are comprehensively considered, and the satellite base station with the moderate switching waiting duration is selected as the alternative target satellite base station, so that the service continuity is ensured, and the problem of early switching or late switching can be avoided.

It should be noted that, the source satellite base station takes one or more of the candidate satellite base stations returning the handover confirmation message as the candidate target satellite base stations; for example, the source satellite base station receives the handover confirmation message returned by the candidate satellite base station a, the candidate satellite base station B, the candidate satellite base station C, and the candidate satellite base station D, and the source satellite base station uses the candidate base station B and the candidate base station C as the candidate target satellite base station according to the local policy.

After determining the alternative target satellite base station, the source satellite base station sends a switching command containing the configuration information of the target satellite base station to the terminal;

optionally, the source satellite base station sends the handover command to the terminal in the following manner:

in the mode 1, a source satellite base station returns a switching command to the terminal, wherein the switching command comprises configuration information of all determined alternative target satellite base stations;

one optional mode is that the source satellite base station receives a handover confirmation message returned by a plurality of candidate satellite base stations, determines an alternative target satellite base station from the candidate satellite base stations receiving the handover confirmation message, and forwards the handover confirmation message returned by the alternative target satellite base station to the terminal through a handover command.

Mode 2, the source satellite base station returns a plurality of switching commands to the terminal; each switching command comprises configuration information of one or more alternative target satellite base stations;

it should be noted here that the total number of candidate target satellite base stations in the multiple handover commands is the number of candidate target satellite base stations determined by the source satellite base station.

An optional implementation manner is that the source satellite base station receives handover confirmation messages returned by the multiple candidate satellite base stations, determines the candidate target satellite base station from the multiple candidate satellite base stations that receive the handover confirmation messages, and forwards the handover confirmation messages returned by the candidate target satellite base station to the terminal through the multiple handover commands.

For example, when there are N target base stations, the source satellite base station sends a handover command including configuration information of the target satellite base station to the terminal through N handover commands, where each handover command includes configuration information of one target satellite base station.

Optionally, the terminal determines the target satellite base station to be handed over to according to the configuration information of at least one candidate target satellite base station included in the handover command.

Specifically, when the handover command includes one candidate target satellite base station, the candidate target satellite base station is used as a target satellite base station to be handed over;

and when the switching command comprises at least two candidate target satellite base stations, the terminal selects the candidate target satellite base station with the closest distance from the at least two candidate target satellite base stations as the target satellite base station.

When the configuration information of the target satellite base station comprises the delayed switching time length, the terminal selects the target satellite base station needing to be switched according to the following modes:

and the terminal sorts at least two target satellite base stations from small to large according to the delayed switching time length, and selects the alternative target satellite base station with the top sorting as the target satellite base station needing to be switched.

The following describes a method for switching a terminal from a source satellite base station to a target satellite base station according to different ways of selecting the target satellite base station.

Firstly, selecting a target satellite base station according to the distance.

The terminal selects the candidate target satellite base station with the closest distance as the target satellite base station needing switching according to the distance, and then switches at the following time:

1. the terminal determines a first moment when the target satellite base station covers the area where the terminal is located according to the satellite orbit diagram information of the satellite base station; when the first time arrives, the terminal is switched from the source satellite base station to the target satellite base station;

2. the terminal determines a first moment when the target satellite base station covers the area where the terminal is located according to the satellite orbit diagram information of the satellite base station; measuring the signal quality of the target satellite base station within a first preset time before the first time arrives; and after the signal quality of the target satellite base station is greater than a second threshold value, the terminal is switched from the source satellite base station to the target satellite base station.

It should be noted that, if the terminal fails to switch during the process of switching to the target satellite base station, the terminal initiates switching to an alternative satellite base station which is closest to the target satellite base station and is other than the target satellite base station in the alternative target satellite base station; and so on, and will not be described in detail herein.

And secondly, selecting a target satellite base station according to the delay switching time length.

When the configuration information of the target satellite base station comprises the delayed switching time, a switching timer is maintained inside the terminal; and the terminal selects the alternative target satellite base station with the minimum delay switching duration as the target satellite base station needing to be switched according to the delay switching duration.

The terminal starts a switching timer, and the time length of the switching timer is set as the delay switching time length corresponding to the target satellite base station;

here, after the terminal starts the handover timer, if the set handover timer duration elapses, the handover timer times out.

In an alternative mode, the terminal performs handover at the following occasions:

1. at the time when the switching timer is overtime, the terminal is switched from the source satellite base station to the target satellite base station;

2. within a second preset time before the switching timer is overtime, the terminal measures the signal quality of the target satellite base station; switching from the source satellite base station to the target satellite base station after the signal quality of the target satellite base station is greater than a third threshold; or

3. Before the switching timer is overtime or before a second preset time before the switching timer is overtime, if the signal quality of the source satellite base station is determined to be smaller than a fourth threshold value, the terminal measures the signal quality of the target satellite, and when the signal quality of the target satellite is determined to be larger than a fifth threshold value, the terminal is switched from the source satellite base station to the target satellite base station; or

4. Before the switching timer is overtime or before a second preset time before the switching timer is overtime, if the signal quality of the source satellite base station is determined to be smaller than a sixth threshold, the terminal measures the signal quality of all the alternative target satellite base stations, and when the measured signal quality of the alternative target satellite base station is larger than a seventh threshold, the source satellite base station is switched to the alternative target satellite base station of which the signal quality is larger than the seventh threshold.

It should be noted here that, if the terminal fails to switch during the process of switching to the target satellite base station, the terminal initiates switching to an alternative satellite base station with the smallest delay of switching, except for the target satellite base station, in the alternative target satellite base station; and so on, and will not be described in detail herein.

In the embodiment of the present invention, the second threshold, the third threshold, the fourth threshold, the fifth threshold, the sixth threshold, and the seventh threshold are preset values, or experience values of those skilled in the art; the second threshold, the third threshold, the fifth threshold and the seventh threshold may be the same value, or partially different values, or all different values; the fourth threshold and the sixth threshold are the same or different values.

In addition, when the arrangement information of the candidate target satellite base station includes the delayed handover time period, a method of performing handover in a manner of selecting the target satellite base station according to the distance may be employed.

As shown in fig. 4, a switching control flow chart according to an embodiment of the present invention is shown.

Step 401, the terminal determines at least one candidate satellite base station according to satellite orbit diagram information of the satellite base station in the area;

for example, candidate satellite base station a, candidate satellite base station B, and candidate satellite base station C are determined.

Step 402, the terminal sends a first handover request containing information of at least one candidate satellite base station to a source satellite base station.

In step 403, the source satellite base station sends a second handover request to at least one candidate satellite base station through the inter-base station interface.

Step 404, the candidate satellite base station determines whether the handover request can be accepted according to its own load or a preset constraint condition.

Step 405, after determining that the candidate satellite base station can receive the switching request, returning a switching confirmation message to the source satellite base station; otherwise, returning a switching failure message;

for example, candidate satellite base station a returns a handover confirm message, candidate satellite base station B returns a handover confirm message, and candidate satellite base station C returns a handover failure message.

Step 406, the source satellite base station takes at least one candidate satellite base station returning the switching confirmation message as an alternative target satellite base station according to a local strategy;

and the source satellite base station takes the candidate satellite base station A and the candidate satellite base station B as alternative target satellite base stations.

Step 407, the source satellite base station returns a handover command containing configuration information of at least one candidate target satellite base station to the terminal.

Step 408, the terminal determines a target satellite base station to be switched to according to the configuration information of at least one alternative target satellite base station contained in the switching command;

the determined target satellite base station is assumed to be a candidate satellite base station a.

Step 409, the terminal is switched from the source satellite base station to the target satellite base station;

wherein, the terminal initiates the switching process at a proper time, and the specific switching time refers to the above description.

As shown in fig. 5, a first terminal according to an embodiment of the present invention includes: a processor 500, a memory 501, a transceiver 502, and a bus interface.

The processor 500 is responsible for managing the bus architecture and general processing, and the memory 501 may store data used by the processor 500 in performing operations. The transceiver 503 is used to receive and transmit data under the control of the processor 500.

The bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 500 and various circuits of memory represented by memory 501 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 500 is responsible for managing the bus architecture and general processing, and the memory 501 may store data used by the processor 500 in performing operations.

The processes disclosed in the embodiments of the present invention may be applied to the processor 500, or implemented by the processor 500. In implementation, the steps of the signal processing flow may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 500. The processor 500 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof that may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 501, and the processor 500 reads the information in the memory 501, and completes the steps of the signal processing flow in combination with the hardware thereof.

Specifically, the processor 500 is configured to read the program in the memory 501 and execute:

Optionally, the processor 500 is specifically configured to:

Optionally, the processor 500 is further configured to:

Optionally, the processor 500 is specifically configured to:

Optionally, the processor 500 is further configured to:

Optionally, the processor 500 is specifically configured to:

As shown in fig. 6, a first provenance satellite base station according to an embodiment of the present invention includes: a processor 600, a memory 601, a transceiver 602, and a bus interface.

The processor 600 is responsible for managing the bus architecture and general processing, and the memory 601 may store data used by the processor 600 in performing operations. The transceiver 603 is used for receiving and transmitting data under the control of the processor 600.

The bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 600 and various circuits of memory represented by memory 601 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 600 is responsible for managing the bus architecture and general processing, and the memory 601 may store data used by the processor 600 in performing operations.

The processes disclosed in the embodiments of the present invention may be applied to the processor 600, or implemented by the processor 600. In implementation, the steps of the signal processing flow may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 600. The processor 600 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof that may implement or perform the methods, steps or logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 601, and the processor 600 reads the information in the memory 601 and completes the steps of the signal processing flow in combination with the hardware thereof.

Specifically, the processor 600 is configured to read the program in the memory 601 and execute:

Optionally, the processor 600 is specifically configured to:

As shown in fig. 7, a first core network device according to the embodiment of the present invention includes: a processor 700, a memory 701, a transceiver 702, and a bus interface.

The processor 700 is responsible for managing the bus architecture and general processing, and the memory 701 may store data used by the processor 700 in performing operations. The transceiver 703 is used for receiving and transmitting data under the control of the processor 700.

The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 700, and various circuits, represented by memory 701, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 700 is responsible for managing the bus architecture and general processing, and the memory 701 may store data used by the processor 700 in performing operations.

The processes disclosed in the embodiments of the present invention may be applied to the processor 700, or implemented by the processor 700. In implementation, the steps of the signal processing flow may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 700. The processor 700 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof that may implement or perform the methods, steps or logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 701, and the processor 700 reads the information in the memory 701, and completes the steps of the signal processing flow in combination with the hardware thereof.

Specifically, the processor 700 is configured to read the program in the memory 701 and execute:

Optionally, the processor 700 is further configured to:

receiving an indication of a data management center;

As shown in fig. 8, a second terminal according to an embodiment of the present invention includes:

a first determining module 801, configured to determine at least one candidate satellite base station according to satellite-orbit diagram information of a satellite base station in an area, and send a first handover request including information of the at least one candidate satellite base station to a currently accessed source satellite base station, so that the source satellite base station determines a handover command to be returned to the terminal according to the at least one candidate satellite base station;

a second determining module 802, configured to determine, according to a handover command returned by the source satellite base station, a target satellite base station to be handed over to;

a processing module 803, configured to handover from the source satellite base station to the target satellite base station.

Optionally, the first determining module 801 is specifically configured to:

Optionally, the second determining module 802 is further configured to:

Optionally, the second determining module 802 is specifically configured to:

Optionally, the processing module 803 is specifically configured to:

determining a first moment when the target satellite base station covers the area where the terminal is located according to the satellite orbit diagram information of the satellite base station; switching from the source satellite base station to the target satellite base station upon arrival of the first time instant; or

Determining a first moment when the target satellite base station covers the area where the terminal is located according to the satellite orbit diagram information of the satellite base station; measuring the signal quality of the target satellite base station within a first preset time before the first time arrives; and switching from the source satellite base station to the target satellite base station after the signal quality of the target satellite base station is greater than a second threshold value.

Optionally, the second determining module 802 is specifically configured to:

Optionally, the second determining module 802 is further configured to:

Optionally, the processing module 803 is specifically configured to:

As shown in fig. 9, a second source satellite base station according to the embodiment of the present invention includes:

a first receiving module 901, configured to receive a first handover request sent by a terminal and including information of at least one candidate satellite base station; the at least one candidate satellite base station is determined by the terminal according to satellite-orbit diagram information of the satellite base station in the region;

a first sending module 902, configured to return a handover command to the terminal according to the at least one candidate satellite base station, so that the terminal determines a target satellite base station to be handed over to according to the handover command, and hands over from the source satellite base station to the target satellite base station.

Optionally, the first sending module 902 is specifically configured to:

As shown in fig. 10, a second core network device according to the embodiment of the present invention includes:

a second receiving module 1001, configured to receive a request message sent by a terminal through a currently accessed source satellite base station;

a second sending module 1002, configured to forward satellite trajectory map information of a satellite base station in an area where the terminal is located to the terminal through the source satellite base station.

Optionally, the second receiving module 1001 is further configured to:

receiving an indication of a data management center;

An embodiment of the present invention provides a computer-readable storage medium having stored thereon a computer program that, when executed by a processor, implements the steps of the above-described terminal-side switching control method.

Embodiments of the present invention provide a computer-readable medium having stored thereon a computer program, which, when executed by a processor, implements the steps of the above-described source satellite base station side handover control method.

An embodiment of the present invention provides a computer-readable medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the above-mentioned core network device side information obtaining method.

Based on the same inventive concept, the embodiment of the present invention provides a first handover control method, and since the method corresponds to a terminal in the handover control system of the embodiment of the present invention, and the principle of the method for solving the problem is similar to that of the system, the implementation of the method can refer to the implementation of the system, and repeated details are not repeated.

As shown in fig. 11, a first handover control method according to an embodiment of the present invention includes:

step 1101, a terminal determines at least one candidate satellite base station according to satellite orbit diagram information of a satellite base station in an area, and sends a first switching request containing information of the at least one candidate satellite base station to a source satellite base station accessed currently, so that the source satellite base station determines a switching command returned to the terminal according to the at least one candidate satellite base station;

step 1102, the terminal determines a target satellite base station to be switched to according to a switching command returned by the source satellite base station;

step 1103, the terminal is handed over from the source satellite base station to the target satellite base station.

Based on the same inventive concept, the second handover control method is provided in the embodiment of the present invention, and since the method corresponds to the source satellite base station in the handover control system in the embodiment of the present invention, and the principle of the method for solving the problem is similar to that of the system, the implementation of the method may refer to the implementation of the system, and repeated details are not repeated.

As shown in fig. 12, a second handover control method according to an embodiment of the present invention includes:

step 1201, a source satellite base station receives a first switching request containing at least one candidate satellite base station information sent by a terminal; the at least one candidate satellite base station is determined by the terminal according to satellite-orbit diagram information of the satellite base station in the region;

step 1202, the source satellite base station returns a handover command to the terminal according to the at least one candidate satellite base station, so that the terminal determines a target satellite base station to be handed over to according to the handover command, and the source satellite base station is handed over to the target satellite base station.

Based on the same inventive concept, in the information acquisition method provided in the embodiment of the present invention, since the method corresponds to the core network device in the handover control system in the embodiment of the present invention, and the principle of the method for solving the problem is similar to that of the system, the implementation of the method may refer to the implementation of the system, and repeated details are not repeated.

As shown in fig. 13, an information obtaining method provided in an embodiment of the present invention includes:

step 1301, receiving a request message sent by a terminal through a currently accessed source satellite base station by core network equipment;

step 1302, the core network device forwards satellite orbit diagram information of the satellite base station of the area where the terminal is located to the terminal through the source satellite base station.

Optionally, the method further includes:

the core network equipment receives an indication of a data management center;

The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, 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, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.

Accordingly, the subject application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

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

1. A handover control method, comprising:

2. The method of claim 1, wherein the terminal determines satellite base station satellite trajectory map information of the region according to:

the terminal acquires satellite base station satellite-orbit diagram information of a region where the terminal is located, which is configured in advance during signing; or the terminal receives satellite base station satellite-orbit diagram information of the area where the terminal is located, which is transmitted by the core network equipment forwarded by the source satellite base station; and the satellite orbit diagram information of the satellite base station of the area where the terminal is located is sent by the core network equipment after receiving the request message sent by the terminal through the source satellite base station.

3. The method of claim 1, wherein the terminal sending a first handover request containing information of at least one candidate satellite base station to a currently accessed source satellite base station comprises:

4. The method as claimed in claim 1, wherein after the terminal sends the first handover request containing the information of the at least one candidate satellite base station to the currently accessed source satellite base station, before determining the target satellite base station to be handed over to according to the received handover command returned by the source satellite base station, further comprising:

5. The method as claimed in claim 4, wherein the determining, by the terminal, the target satellite bs to which handover is required according to the handover command returned by the source satellite bs comprises:

6. The method of claim 5, wherein when there are at least two candidate target satellite base stations, the terminal determines a target satellite base station according to the following:

7. The method of claim 6, wherein the terminal handing over a currently accessed source satellite base station to the target satellite base station comprises:

8. The method of claim 4, wherein the configuration information of the target satellite base station comprises a delayed handover duration.

9. The method of claim 8, wherein when there are at least two candidate target satellite base stations, the terminal determines a target satellite base station according to the following:

10. The method of claim 8, wherein after the terminal selects the target satellite base station, prior to handing over from the source satellite base station to the target satellite base station, further comprising:

11. The method of claim 10, wherein the terminal being handed off from the source satellite base station to the target satellite base station comprises:

12. The method according to any one of claims 1 to 11, wherein the satellite base station satellite-orbit diagram information of the area where the terminal is located includes part or all of the following information:

13. A handover control method, comprising:

14. The method of claim 13, wherein the returning of the handover command to the terminal by the source satellite base station based on the at least one candidate satellite base station comprises:

15. The method of claim 14, wherein the determining, by the source satellite base station, at least one candidate target satellite base station to which the terminal can be handed off based on the at least one candidate satellite base station comprises:

16. An information acquisition method, characterized in that the method comprises:

17. The method of claim 16, further comprising:

the core network equipment receives an indication of a data management center;

18. A terminal comprising a processor, a memory, and a transceiver;

19. The terminal of claim 18, wherein the processor is further configured to:

20. The terminal of claim 18, wherein the processor is further configured to:

21. The terminal of claim 18, wherein the processor is further configured to:

22. The terminal of claim 21, wherein the processor is further configured to:

23. The terminal of claim 22, wherein the processor is further configured to:

24. The terminal of claim 23, wherein the processor is further configured to:

25. The terminal of claim 21, wherein the configuration information of the target satellite base station comprises a delayed handover duration.

26. The terminal of claim 25, wherein the processor is further configured to:

27. The terminal of claim 25, wherein the processor is further configured to:

28. The terminal of claim 27, wherein the processor is further configured to:

29. The terminal according to any of claims 18 to 28, wherein the satellite base station satellite-orbit diagram information of the area where the terminal is located comprises part or all of the following information:

30. A source satellite base station comprising a processor, a memory, and a transceiver;

31. The source satellite base station of claim 30, wherein the processor is specifically configured to:

32. The source satellite base station of claim 30, wherein the processor is specifically configured to:

33. A core network device comprising a processor, a memory, and a transceiver;

34. The core network device of claim 33, wherein the processor is further configured to:

receiving an indication of a data management center;

35. A terminal, comprising:

36. A source satellite base station, comprising

37. A core network device, comprising:

38. A computer-readable medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 12, or carries out the steps of the method according to any one of claims 13 to 15, or carries out the steps of the method according to claim 16 or 17.