CN110429975B - Satellite switching method and device - Google Patents
Satellite switching method and device Download PDFInfo
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- CN110429975B CN110429975B CN201910839208.5A CN201910839208A CN110429975B CN 110429975 B CN110429975 B CN 110429975B CN 201910839208 A CN201910839208 A CN 201910839208A CN 110429975 B CN110429975 B CN 110429975B
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Abstract
The application discloses a satellite switching method and a satellite switching device, wherein the method comprises the following steps: determining a target satellite gateway station and a switching time, and sending first information and second information to the target satellite gateway station before the switching time, wherein the first information is used for indicating that: the target satellite gateway station establishes a target satellite cell before the handover time, and the first information includes: the configuration parameters of the satellite cell of the satellite under the original satellite gateway station and the second information are used for indicating the target satellite gateway station to establish the context information of the target terminal under the target gateway station before the switching moment and establishing user bearing with the target core network; first indication information transmitted by the target satellite gateway station is received prior to the time of the handoff. By adopting the scheme provided by the application, the non-inductive switching can be realized for the user of the target terminal.
Description
Technical Field
The present application relates to the field of satellite communications, and in particular, to a satellite switching method and apparatus.
Background
In a satellite communication system, any one of satellites moves along a predetermined movement trajectory, and during the movement of the satellite, it is necessary to switch from one satellite gateway station to another satellite gateway station (for the convenience of description, "one satellite gateway station" is referred to as an original satellite gateway station, and "another satellite gateway station" is referred to as a target satellite gateway station). In a satellite communication system, a user bearer is established between a satellite gateway station and a core network, wherein an original satellite gateway station and a target satellite gateway station may belong to the same core network or different core networks, (for convenience of description, the core network to which the target satellite gateway station belongs is referred to as a target core network, and the core network to which the original satellite gateway station belongs is referred to as an original core network), that is, in the case that the original satellite gateway station and the target satellite gateway station belong to the same core network, a prokaryotic core network is the same as the target core network.
At present, under the condition that a satellite is switched from an original satellite gateway station to a target satellite gateway station, the service of a target terminal (a terminal of the satellite in a ground coverage area at the switching moment) needs to be interrupted, and the user of the target terminal cannot be switched in a non-inductive manner.
Disclosure of Invention
The application provides a satellite switching method and a satellite switching device, and aims to solve the problem that the user of a target terminal cannot be switched in a non-inductive mode.
In order to achieve the above object, the present application provides the following technical solutions:
the application provides a satellite switching method, which is applied to an original satellite gateway station and comprises the following steps:
determining a target satellite gateway station and switching time; the switching time is the time when the satellite is switched from the original satellite gateway station to the target satellite gateway station;
sending first information and second information to the target satellite gateway station before the switching time, wherein the first information is used for indicating the target satellite gateway station to establish a target satellite cell before the switching time, and the target satellite cell is a satellite cell with configuration parameters identical to those of the satellite cell of the satellite under the original satellite gateway station; the first information includes: the configuration parameters of the satellite cell of the satellite under the original satellite gateway station;
the second information is used for indicating that: before the switching moment, the target satellite gateway station establishes context information of a target terminal under the target satellite gateway station, and indicates the target satellite gateway station to establish user bearing with a target core network before the switching moment; the target terminal is a terminal in a coverage area of a satellite cell of the satellite on the ground at the switching moment; the target core network is a core network to which the target satellite gateway station belongs; the second information includes: the context information of the target terminal under the original satellite gateway station;
receiving first indication information sent by the target satellite gateway station before the switching moment; the first indication information is used for indicating that the target satellite gateway station and the target core network complete the preparation for switching the satellite.
Optionally, the sending second information to the target satellite gateway station before the handover time includes:
determining the coverage area of each satellite cell of the satellite on the ground at the switching moment to obtain a plurality of reference coverage areas;
in the satellite motion process, the earliest moment in moments when the actual coverage area of each satellite cell of the satellite on the ground is tangent to the corresponding reference coverage area is used as a reference moment;
sending target information to the target satellite gateway station from the reference time to the switching time at intervals of preset time; the target information includes: the context information of the terminal to be processed under the original satellite gateway station; and the terminal to be processed is a terminal of which the actual coverage area and the corresponding reference coverage area are in the overlap area newly added in the preset duration.
The application also provides a satellite switching method, which is applied to a target satellite gateway station and comprises the following steps:
under the condition of receiving first information, before the switching moment, establishing a target satellite cell at the target satellite gateway station according to the first information; the target satellite cell is a satellite cell with configuration parameters identical to those of the satellite cell of the satellite at the original satellite gateway station; the first information includes: the configuration parameters of the satellite cell of the satellite under the original satellite gateway station;
under the condition of receiving second information, before the switching moment, completing the establishment of the context information of the target terminal under the target satellite gateway station according to the second information, and establishing a user bearer with a target core network; the target terminal is a terminal in a coverage area of a satellite cell of the satellite on the ground at the switching moment; the target core network is a core network to which the target satellite gateway station belongs; the second information includes: the context information of the target terminal under the original satellite gateway station;
sending third information to the target core network at the switching time under the condition that the target core network and the original core network are different core networks; the third information is used for indicating the target core network, establishing context information of the target terminal under the target core network before the switching moment, and establishing user bearing between the target terminal and the target satellite gateway before the switching moment;
and sending first indication information to the original gateway station at the switching moment, wherein the first indication information is used for indicating that the target satellite gateway station and the target core network finish the preparation for switching the satellite.
Optionally, the method further includes: at the switching time, a feeder link is established with the satellite.
Optionally, after the feeder link is established with the satellite at the switching time, the method further includes:
and synchronizing uplink and downlink time with the target terminal.
The application also provides a satellite switching method, which is applied to a target core network, wherein the target core network is a core network to which a target satellite gateway station belongs, and the method comprises the following steps:
under the condition that the target core network and the prokaryotic core network are different core networks, under the condition that first information is received, a request is sent to the original core network; the request is used for requesting the original core network to send context information of a target terminal under the prokaryotic core network; the first information is used for indicating the target core network to establish the context information of the target terminal under the target core network before the switching moment, and establishing user bearing with the target satellite gateway before the switching moment; the target terminal is a terminal in the ground coverage area of the satellite cell of the satellite at the switching moment;
under the condition of receiving response information sent by the original core network, establishing context information of the target terminal under the target core network according to the response information; the response information includes: context information of the target terminal under the prokaryotic core network;
and under the condition of receiving the first information, establishing user bearing between the target satellite gateway and the target satellite before the switching moment.
The application also provides a satellite switching device, is applied to former satellite gateway station, includes:
the determining module is used for determining a target satellite gateway station and switching time; the switching time is the time when the satellite is switched from the original satellite gateway station to the target satellite gateway station;
a sending module, configured to send first information and second information to the target satellite gateway station before the handover time, where the first information is used to instruct the target satellite gateway station to establish a target satellite cell before the handover time, and the target satellite cell is a satellite cell with configuration parameters that are the same as those of a satellite cell of the satellite in the original satellite gateway station; the first information includes: the configuration parameters of the satellite cell of the satellite under the original satellite gateway station;
the second information is used for indicating that: before the switching moment, the target satellite gateway station establishes context information of a target terminal under the target satellite gateway station, and indicates the target satellite gateway station to establish user bearing with a target core network before the switching moment; the target terminal is a terminal in a coverage area of a satellite cell of the satellite on the ground at the switching moment; the target core network is a core network to which the target satellite gateway station belongs; the second information includes: the context information of the target terminal under the original satellite gateway station;
the receiving module is used for receiving first indication information sent by the target satellite gateway station before the switching time; the first indication information is used for indicating that the target satellite gateway station and the target core network complete the preparation for switching the satellite.
Optionally, the sending module is configured to send second information to the target satellite gateway station before the handover time, where the second information includes:
the sending module is specifically configured to determine coverage areas of each satellite cell of the satellite on the ground at the handover time to obtain a plurality of reference coverage areas;
in the satellite motion process, the earliest moment in moments when the actual coverage area of each satellite cell of the satellite on the ground is tangent to the corresponding reference coverage area is used as a reference moment;
sending target information to the target satellite gateway station from the reference time to the switching time at intervals of preset time; the target information includes: the context information of the terminal to be processed under the original satellite gateway station; and the terminal to be processed is a terminal of which the actual coverage area and the corresponding reference coverage area are in the overlap area newly added in the preset duration.
The application also provides a satellite switching device, is applied to target satellite gateway station, includes:
the first establishing module is used for establishing a target satellite cell at the target satellite gateway station according to the first information before the switching time under the condition of receiving the first information; the target satellite cell is a satellite cell with configuration parameters identical to those of the satellite cell of the satellite at the original satellite gateway station; the first information includes: the configuration parameters of the satellite cell of the satellite under the original satellite gateway station;
the second establishing module is used for completing the establishment of the context information of the target terminal under the target satellite gateway station according to the second information and establishing user bearing with a target core network under the condition of receiving the second information and before the switching moment; the target terminal is a terminal in a coverage area of a satellite cell of the satellite on the ground at the switching moment; the target core network is a core network to which the target satellite gateway station belongs; the second information includes: the context information of the target terminal under the original satellite gateway station;
a first sending module, configured to send third information to the target core network before the handover time when the target core network and the original core network are different core networks; the third information is used for indicating the target core network, establishing context information of the target terminal under the target core network before the switching moment, and establishing user bearing between the target terminal and the target satellite gateway before the switching moment;
a second sending module, configured to send first indication information to the original gateway station at the handover time, where the first indication information is used to indicate that the target satellite gateway station and the target core network have completed preparation for handover of the satellite.
Optionally, the method further includes: a third establishing module for establishing a feeder link with the satellite at the switching time.
Optionally, the method further includes: and the synchronization module is used for synchronizing uplink and downlink time with the target terminal after the switching time and the satellite establish a feed link.
The present application further provides a satellite switching device, which is applied to a target core network, and includes:
a sending module, configured to send a request to the original core network when receiving first information in a case where the target core network and the prokaryotic core network are different core networks; the request is used for requesting the original core network to send context information of a target terminal under the prokaryotic core network; the first information is used for indicating the target core network to establish the context information of the target terminal under the target core network before the switching moment, and establishing user bearing with the target satellite gateway before the switching moment; the target terminal is a terminal in the ground coverage area of the satellite cell of the satellite at the switching moment;
a first establishing module, configured to establish context information of the target terminal in the target core network according to response information sent by the original core network when the response information is received; the response information includes: context information of the target terminal under the prokaryotic core network;
and the second establishing module is used for establishing user bearing with the target satellite gateway before the switching time under the condition of receiving the first information.
In the satellite switching method and device, before the switching time, a satellite cell with the same configuration parameters as an original satellite cell (a satellite cell of a satellite under the original satellite gateway station) is established under a target satellite gateway station, context information of a target terminal under the target satellite gateway station is established by the target satellite gateway station, context information of the target terminal under a target core network is established by a target core network, and user bearing is established between the target satellite gateway station and the target core network, so that the target terminal can directly communicate with the target satellite gateway station through the satellite under the condition that the satellite is switched from the original satellite gateway station to the target satellite gateway station at the switching time, the service of the target terminal does not need to be interrupted under the condition that the satellite is switched from the original satellite gateway station to the target satellite gateway station, and further, the scheme provided by the application is adopted, the non-inductive switching can be realized for the user of the target terminal.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a satellite communication system in which an original satellite gateway station and a target satellite gateway station belong to the same core network, according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a satellite communication system in which a source satellite gateway station and a target satellite gateway station belong to different core networks according to an embodiment of the present application;
fig. 3 is a schematic view illustrating an interaction flow between devices in a satellite communication system according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of coverage areas formed on the ground by satellite cells at different times during a satellite movement process disclosed in the embodiment of the present application;
fig. 5 is a schematic view illustrating an interaction flow between devices in another satellite communication system according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a satellite switching apparatus according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of another satellite switching device disclosed in the embodiment of the present application;
fig. 8 is a schematic structural diagram of another satellite switching device disclosed in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and 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 application.
The inventor of the present application finds, in research, that when a satellite is switched from an original satellite gateway station to a target satellite gateway station, a service of a target terminal needs to be interrupted, and reasons why the service cannot be switched to a user of the target terminal without any sense include: under the condition that the satellite is switched from the original satellite gateway station to the target satellite gateway station, the target terminal needs to perform signaling interaction with the target satellite gateway station until the target terminal is successfully accessed to the target satellite gateway station, so that a certain time is needed for switching the target terminal to the target satellite gateway station, the service of the target terminal is interrupted during the switching period of switching the target terminal to the target satellite gateway station, and the experience of a user of the target terminal is poor.
In the present embodiment, therefore, prior to a handoff of a satellite from an original satellite gateway station to a target satellite gateway station, establishing a satellite cell with the same configuration parameters as the original satellite cell (the satellite cell of the satellite under the original satellite gateway station) at the target satellite gateway station, establishing context information of a target terminal under the target satellite gateway station at the target satellite gateway station, establishing user bearer between the target satellite gateway station and a target core network, and, under the condition that the target core network and the prokaryotic core network are different core networks, the context information of the target terminal under the target core network is established in the target core network, before the satellite is switched from the original satellite gateway station to the target satellite gateway station, the conditions required by the target terminal for communication with the target satellite gateway station through the satellite are prepared, and therefore the effect that the user of the target terminal experiences the non-inductive switching is achieved.
In the embodiment of the application, any one satellite in a satellite communication system is taken as an example, the satellite is switched from one satellite gateway station to the next satellite gateway station, and the interaction process among all devices in the satellite communication system is introduced. In the following, for example, the original satellite gateway station and the target satellite gateway station belong to one core network (as shown in fig. 1), and the original satellite gateway station and the target satellite gateway station belong to different core networks (as shown in fig. 4), respectively, the interaction process between the devices in the satellite communication system is performed.
Fig. 3 is a schematic view of an interaction flow of each device in a satellite communication system according to an embodiment of the present application, where an original satellite gateway station and a target satellite gateway station belong to a core network, and the method includes the following steps:
s301, the original satellite gateway station maintains a satellite list.
In this embodiment, one satellite gateway station may serve a plurality of satellites, and information of each satellite served by the satellite gateway station is recorded in the satellite list, wherein, for any one satellite served by the satellite gateway station, the satellite list includes relevant information of the satellite. Specifically, the information related to any one satellite includes: the satellite switching method comprises the steps of satellite cell information of a satellite, terminal information in a satellite cell of the satellite, the current position of the satellite, ephemeris information, a satellite gateway station and a switching position between two adjacent satellite gateway stations, wherein the satellite gateway station and the switching position are switched in sequence when the satellite runs according to a preset motion track, and the switching position is the position of switching the satellite from one satellite gateway station to the next satellite gateway station in the two adjacent satellite gateway stations.
S302, the original satellite gateway station determines a target satellite gateway station based on the relevant information of the satellite, and determines the moment when the satellite is switched from the original satellite gateway station to the target satellite gateway station as the switching moment.
Specifically, in this step, the target satellite gateway stations to which the satellites need to be switched from the original satellite gateway stations can be obtained according to the satellite gateway stations which need to be switched in sequence when the satellites run according to the preset motion trajectory in the ephemeris information of the satellites.
Specifically, the original satellite gateway station may calculate the time when the satellite moves to the switching position as the switching time according to the current position, the current time, the switching position (the position where the satellite is switched from the original satellite gateway station to the target satellite gateway station) of the satellite, and the movement speed of the satellite.
S303, the original satellite gateway station sends the first information and the second information to the target satellite gateway station before the switching time.
First information for instructing the target satellite gateway station to establish the target satellite cell prior to the time of the handover. The target satellite cell is a satellite cell with configuration parameters identical to those of the satellite cell of the satellite at the original satellite gateway station. Wherein, the configuration parameters comprise: cell Global Identity (ECGI), RRC configuration, SDAP configuration, PDCP configuration, RLC configuration, MAC configuration, PHY configuration, etc. The first information includes: and (3) configuration parameters of a satellite cell of the satellite under the original satellite gateway station.
The second information is used for indicating: and before the switching moment, the target satellite gateway station establishes context information of the target terminal under the target satellite gateway station, and indicates the target satellite gateway station to establish user bearing with the target core network before the switching moment. The target terminal is a terminal in the coverage area of each satellite cell of the satellite at the switching moment. The second information includes: context information of the target terminal under the original satellite gateway station. The context information of the target terminal under the original satellite gateway station comprises: X2/Xn context, S1/NG context, SDAP context, RRC context, PDCP context, RLC context, MAC context, C-RNTI, etc.
And S304, the target satellite gateway station establishes a target satellite cell.
Specifically, the target satellite gateway station establishes the target satellite cell according to the configuration parameters of the satellite in the satellite cell of the original satellite gateway station in the second information, where the method for establishing the target satellite cell is the prior art and is not described herein again.
S305, establishing user bearing between the target satellite gateway station and the target core network.
In this step, the target core network is the core network to which the target gateway station belongs. Specifically, the implementation manner of establishing the user bearer between the target satellite gateway station and the target core network is the prior art, and is not described herein again.
S306, the target satellite gateway station establishes the context information of the target terminal under the target satellite gateway station.
Specifically, the specific establishment process of this step is the prior art, and is not described herein again.
S307, before the switching time, the target satellite gateway station sends first indication information to the original satellite gateway station.
Specifically, the first indication information is used for indicating that the target satellite gateway station has completed preparation work before the satellite switching. Namely, the target satellite gateway station establishes the context information under the target terminal target satellite gateway station, establishes the target satellite cell and establishes the user bearer with the target core network.
And S308, the satellite establishes a feeder link with the target satellite gateway station at the switching moment.
And S309, disconnecting the feeder link between the satellite and the original satellite gateway station.
And S310, the original satellite gateway station releases the resources of the satellite cell and the resources of the terminal.
And S311, performing uplink synchronization and downlink synchronization between the target terminal and the target satellite gateway.
In this step, between the target terminal and the target satellite gateway, the downlink time of the target terminal is synchronized with the downlink time of the target satellite cell, and the uplink time of the target terminal is synchronized with the uplink time of the target satellite cell.
In this embodiment, the target terminal is a terminal in the coverage area of each satellite cell of the satellite on the ground at the time of handover. The target satellite gateway station is required to establish the context information of the target terminal under the target satellite gateway station according to the context information of the target terminal under the original satellite gateway station.
Taking the example of a satellite comprising 2 satellite cells, as shown in fig. 4. In fig. 4, time T4 represents the handover time, and reference coverage areas 1 and 2 are coverage areas of two satellite cells of the satellite at time T4 on the ground, that is, terminals in reference coverage areas 1 and 2 are target terminals, where reference coverage area 1 corresponds to satellite cell 1 and reference coverage area 2 corresponds to satellite cell 2.
At time T4, the context information for the terminal in reference coverage area 1 at the original satellite gateway station corresponds to satellite cell 1, and the context information for the terminal in reference coverage area 2 at the original satellite gateway station corresponds to satellite cell 2. Before the time T4, the context information of the target terminal that needs to be established is: according to the context information of the terminal in the reference coverage area 1 under the original satellite gateway station at the switching moment, establishing the context information of the terminal in the reference coverage area 1 under the target satellite gateway station, wherein the established context information corresponds to the satellite cell 1; and according to the context information of the terminal in the reference coverage area 2 under the original satellite gateway station at the switching moment, establishing the context information of the terminal in the reference coverage area 2 under the target satellite gateway station, wherein the established context information corresponds to the satellite cell 2.
In fig. 4, time T1 is the current time of satellite motion, and actual coverage area 1 and actual coverage area 2 are the coverage areas of the 2 satellite cells of the satellite on the ground at time T1. As can be seen from fig. 4, at time T1, the terminal in the reference coverage area 1 accesses the satellite cell 2, that is, the context information of the terminal accessing the satellite cell 2 at time T1 is established in the original satellite gateway station. If so, the original satellite gateway station sends target information to the target satellite gateway station, wherein the target information comprises: the context information of the terminal accessing the satellite cell 2 in the coverage area 1 under the original satellite gateway station is referred to. And if the target satellite gateway station is before the switching moment, establishing context information of a terminal accessing the satellite cell 2 in the reference coverage area 1 under the target satellite gateway station according to the target information, wherein the established context information corresponds to the satellite cell 2.
However, the embodiment of the present application requires a target satellite gateway station, and establishes context information of terminals in a reference coverage area 1 and a reference coverage area 2 at the switching time under the target satellite gateway station according to the context information of the terminals in the reference coverage area 1 and the reference coverage area 2 at the satellite switching time under the original satellite gateway station. Obviously, the target satellite gateway station sends the target information to the target satellite gateway station according to time T1, and the established context information is not required by the embodiment of the present application, so that the computing resources are wasted.
Therefore, in order to improve the utilization rate of the computing resources, the embodiment of the present application provides a specific implementation manner for the original satellite gateway station to send the first message to the target satellite gateway station, including the following steps a1 to a step A3:
a1, determining the coverage area of each satellite cell of the satellite on the ground at the switching time, and obtaining a plurality of reference coverage areas.
In fig. 4, the coverage areas of the multiple reference frames obtained in this step are the reference coverage area 1 and the reference coverage area 2.
And A2, taking the earliest moment in the moments when the actual coverage area of each satellite cell of the satellite on the ground is tangent to the corresponding reference coverage area as the reference moment during the satellite movement.
In fig. 4, the reference time is the earliest time among the times when the actual coverage area 1 and the reference coverage area 1 are tangent to each other and the time when the actual coverage area 2 and the reference coverage area 2 are tangent to each other.
And A3, sending target information to the target satellite gateway station from the reference time to the switching time at preset time intervals.
In this step, the target information includes: and the terminal to be processed is the terminal in the overlap region newly increased by the preset time length between the actual coverage region and the corresponding reference coverage region.
For example, the reference time is 12 o ' clock and 20 minutes, the switching time is 12 o ' clock and 30 minutes, and the preset time duration is 10s, in this step, the target information is sent to the target satellite gateway station once every 10s from 12 o ' clock and 20 o ' clock and 12 o ' clock and 30 minutes until all the sent terminals to be processed are the target terminals. Taking the target information sent to the target satellite gateway station in 12 points, 20 minutes and 10 seconds as an example, the target information comprises the following terminals to be processed: and in the reference coverage area 1 and the reference coverage area 2, terminals in the overlapped area are newly added in the period from 12 o 'clock 20 min 00 s to 12 o' clock 20 min 10 s.
Taking the reference coverage area 1 as an example, a newly added overlapping area of the reference coverage area 1 in the period of time is described, and assuming that the a area in the 12 o 'clock 20 min 00 sec reference coverage area 1 is an area overlapping with the actual coverage area 1, and the B area in the 12 o' clock 20 min 10 sec reference coverage area 1 is an area overlapping with the actual coverage area 1, in the period of time from 12 o 'clock 20 min 00 sec to 12 o' clock 20 min 10 sec, the newly added overlapping area between the reference coverage area 1 and the actual coverage area 1 is an area in which the B area is newly added on the basis of the a area.
The process of establishing the context information by the target satellite gateway station in S303 to S306 may include: and the original satellite gateway station sends target information to the target satellite gateway station once every preset time from the reference time to the switching time. And for any target information sent at any time, the target satellite gateway station establishes the context information of the terminal to be processed in the target information under the target satellite gateway station according to the target information until the context information of the target terminal under the target satellite gateway station is established.
In the embodiment of the application, the original satellite gateway station sends target information to the target satellite gateway station every time, and the target satellite gateway station establishes context information of the terminal to be processed in the target information under the target satellite gateway station according to the context information of the terminal to be processed in the target information under the original satellite gateway station before the switching moment.
And finally, the target terminal is formed by the terminals to be processed in all the target information sent to the target satellite gateway station by the original satellite gateway station. That is, before the handover time, the target satellite gateway station establishes the context information of the target terminal under the target gateway station, and the established context information is the context information to be established.
Fig. 5 is a schematic view of an interaction flow between devices in another satellite communication system according to an embodiment of the present application, where an original satellite gateway station and a target satellite gateway station belong to different core networks, and the method includes the following steps:
s501, the original satellite gateway station maintains a satellite list.
S502, the original satellite gateway station determines a target satellite gateway station based on ephemeris information of the satellite, and determines the moment when the satellite is switched from the original satellite gateway station to the target satellite gateway station as a switching moment.
S503, the original satellite gateway station sends the first information and the second information to the target satellite gateway station before the switching time.
And S504, the target satellite gateway station establishes a target satellite cell.
And S505, establishing user bearing between the target satellite gateway station and the target core network.
S506, the target satellite gateway station establishes context information of the target terminal under the target satellite gateway station.
The specific implementation manners of S501 to S506 may refer to S301 to S306, which are not described herein again.
And S507, the target satellite gateway station sends third information to the target core network at the switching moment.
In this step, the third information is used to instruct the target core network to establish context information of the target terminal in the target core network before the handover time, and to establish a user bearer with the target satellite gateway before the handover time.
And S508, the target core network sends a request to the prokaryotic core network under the condition of receiving the third information.
In this step, the request is used to request the original core network to send context information of the target terminal in the prokaryotic core network.
And S509, the prokaryotic core network sends response information to the target core network.
In this step, the response information includes: and the context information of the target terminal under the prokaryotic core network.
S510, under the condition that the target core network receives the response information sent by the original core network, the context information of the target terminal under the target core network is established according to the response information.
In this step, the context information of the target terminal under the target core network includes: UE registration information, S1/NG context, UE capability information, etc.
The specific implementation manner of the core network for establishing the context information of the target terminal in the target core network is the prior art, and is not described herein again.
The process of establishing the context information by the target satellite gateway station and the target core network in S503 to S510 may include: the original satellite gateway station sends a piece of target information to the target satellite gateway station every preset time length from the reference time to the switching time, wherein the reference time, the preset time length and the content of the target information refer to the content corresponding to the above embodiment, and are not described herein again. For any target information sent at one time, the target satellite gateway station establishes context information of a terminal to be processed in the target information under the target satellite gateway station according to the target information, and sends third information to a target core network, the target core network sends a request to the prokaryotic core network to request the original core network to send the context information of the terminal to be processed in the target information under the prokaryotic core network, response information is obtained, and the target core network establishes the context information of the terminal to be processed in the target information under the target core network according to the response information until the context information of the target terminal under the target satellite gateway station and the target core network is established.
S511, the target core network sends the establishment information to the target satellite gateway station.
Specifically, the establishment information includes: successful terminal, failed terminal, and context information of the successful terminal under the target core network. The successful terminal is the terminal which successfully establishes the context information under the target core network in the target terminal.
S512, the target satellite gateway station supplements the context information of the successful terminal under the target satellite gateway station according to the establishment condition information, and completes the establishment of the context information of the target terminal under the target satellite gateway station.
Specifically, in this step, the process in which the target satellite gateway station supplements the context information of the successful terminal in the target satellite gateway station is the prior art, and is not described herein again.
S513, the target satellite gateway station sends the first indication information to the original satellite gateway station.
Specifically, the first indication information is used to indicate that the target satellite gateway station and the target core network have completed preparation for switching the satellite.
And S514, the satellite establishes a feeder link with the target satellite gateway station at the switching moment.
In this step, the satellite establishes a feeder link with the target satellite gateway station.
And S515, disconnecting the feeder link between the satellite and the original satellite gateway station.
And S516, the original satellite gateway station releases the resources of the satellite cell and the resources of the terminal.
And S517, performing uplink synchronization and downlink synchronization between the target terminal and the target satellite gateway.
For a specific implementation of this step, reference may be made to S311, which is not described herein again.
S518, the target core network sends the information for updating the target core network to the target terminal.
Fig. 6 is a schematic diagram of a satellite switching apparatus applied to a primary satellite gateway station according to an embodiment of the present application, including: a determination module 601, a sending module 602 and a receiving module 603.
The determining module 601 is configured to determine a target satellite gateway station and a switching time, where the switching time is a time when a satellite is switched from an original satellite gateway station to the target satellite gateway station.
The sending module 602 is configured to send, to a target satellite gateway station before a handover time, first information and second information, where the first information is used to instruct the target satellite gateway station to establish a target satellite cell before the handover time, and the target satellite cell is a satellite cell whose configuration parameters are the same as those of a satellite cell of a satellite at an original satellite gateway station, and the first information includes: and (3) configuration parameters of a satellite cell of the satellite under the original satellite gateway station.
The second information is used for indicating: before the switching moment, the target satellite gateway station establishes context information of a target terminal under the target satellite gateway station, and indicates the target satellite gateway station to establish user bearer with a target core network before the switching moment, the target terminal is a terminal in a ground coverage area of a satellite cell of a satellite under the switching moment, the target core network is a core network to which the target satellite gateway station belongs, and the second information comprises: context information of the target terminal under the original satellite gateway station.
The receiving module 603 is configured to receive first indication information sent by the target satellite gateway station before the handover time, where the first indication information is used to indicate that the target satellite gateway station and the target core network have completed preparation for handover of the satellite.
Optionally, the sending module 602 is configured to send the second information to the target satellite gateway station before the handover time, and includes:
the sending module 602 is specifically configured to determine coverage areas of satellite cells of a satellite on the ground at a handover time, and obtain a plurality of reference coverage areas; in the satellite movement process, the earliest moment in the moments when the actual coverage area of each satellite cell of the satellite on the ground is tangent to the corresponding reference coverage area is used as a reference moment; sending target information to a target satellite gateway station from a reference time to a switching time at preset time intervals, wherein the target information comprises: and the terminal to be processed is the terminal in the overlap region newly increased by the preset time length between the actual coverage region and the corresponding reference coverage region.
Fig. 7 is a schematic diagram of another satellite switching apparatus applied to a target satellite gateway station according to an embodiment of the present application, including: a first establishing module 701, a second establishing module 702, a first sending module 703 and a second sending module 704.
The first establishing module 701 is configured to establish, in a case where first information is received, a target satellite cell at a target satellite gateway station according to the first information before a handover time, where the target satellite cell is a satellite cell having configuration parameters that are the same as configuration parameters of a satellite cell of a satellite at an original satellite gateway station, and the first information includes: and (3) configuration parameters of a satellite cell of the satellite under the original satellite gateway station.
The second establishing module 702 is configured to complete establishment of context information of the target terminal in the target satellite gateway station according to the second information and establish a user bearer with the target core network before the handover time in case of receiving the second information. The target terminal is a terminal in a coverage area of a satellite cell of the satellite on the ground at the switching moment, the target core network is a core network to which the target satellite gateway station belongs, and the second information comprises: context information of the target terminal under the original satellite gateway station.
The first sending module 703 is configured to send third information to the target core network before the handover time when the target core network and the prokaryotic core network are different core networks, where the third information is used to indicate the target core network, establish context information of the target terminal in the target core network before the handover time, and establish a user bearer between the target satellite gateway and the target satellite gateway before the handover time
The second sending module 704 is configured to send first indication information to the original gateway station at the handover time, where the first indication information is used to indicate that the target satellite gateway station and the target core network have completed preparation for handover of the satellite.
Optionally, the apparatus further comprises: a third establishing module 705 for establishing a feeder link with the satellite at the time of the handover.
Optionally, the apparatus further comprises: and a synchronization module 706, configured to synchronize uplink and downlink time with the target terminal after the feeder link is established with the satellite at the handover time.
Fig. 8 is a schematic diagram of another satellite handover apparatus according to an embodiment of the present application, applied to a target core network, including: a sending module 801, a first establishing module 802 and a second establishing module 803.
The sending module 801 is configured to send a request to the core network when the target core network and the core network are different core networks, and the request is used to request the original core network to send context information of the target terminal in the core network, where the first information is used to indicate the target core network to establish the context information of the target terminal in the target core network before the handover time, and to establish a user bearer with the target satellite gateway before the handover time, and the target terminal is a terminal in a coverage area of a satellite cell of a satellite on the ground at the handover time.
The first establishing module 802 is configured to, in a case that response information sent by an original core network is received, establish context information of a target terminal in a target core network according to the response information, where the response information includes: and the context information of the target terminal under the prokaryotic core network.
The second establishing module 803 is configured to establish a user bearer with the target satellite gateway before the handover time when the first information is received.
The functions described in the method of the embodiment of the present application, if implemented in the form of software functional units and sold or used as independent products, may be stored in a storage medium readable by a computing device. Based on such understanding, part of the contribution to the prior art of the embodiments of the present application or part of the technical solution may be embodied in the form of a software product stored in a storage medium and including several instructions for causing a computing device (which may be a personal computer, a server, a mobile computing device or a network device) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A satellite switching method is applied to an original satellite gateway station and comprises the following steps:
determining a target satellite gateway station and switching time; the switching time is the time when the satellite is switched from the original satellite gateway station to the target satellite gateway station;
sending first information and second information to the target satellite gateway station before the switching time, wherein the first information is used for indicating the target satellite gateway station to establish a target satellite cell before the switching time, and the target satellite cell is a satellite cell with configuration parameters identical to those of the satellite cell of the satellite under the original satellite gateway station; the first information includes: the configuration parameters of the satellite cell of the satellite under the original satellite gateway station;
the second information is used for indicating that: before the switching moment, the target satellite gateway station establishes context information of a target terminal under the target satellite gateway station, and indicates the target satellite gateway station to establish user bearing with a target core network before the switching moment; the target terminal is a terminal in a coverage area of a satellite cell of the satellite on the ground at the switching moment; the target core network is a core network to which the target satellite gateway station belongs; the second information includes: the context information of the target terminal under the original satellite gateway station;
receiving first indication information sent by the target satellite gateway station before the switching moment; the first indication information is used for indicating that the target satellite gateway station and the target core network complete the preparation for switching the satellite.
2. The method of claim 1, wherein said transmitting second information to said target satellite gateway station prior to said handoff time comprises:
determining the coverage area of each satellite cell of the satellite on the ground at the switching moment to obtain a plurality of reference coverage areas;
in the satellite motion process, the earliest moment in moments when the actual coverage area of each satellite cell of the satellite on the ground is tangent to the corresponding reference coverage area is used as a reference moment;
sending target information to the target satellite gateway station from the reference time to the switching time at intervals of preset time; the target information includes: the context information of the terminal to be processed under the original satellite gateway station; and the terminal to be processed is a terminal of which the actual coverage area and the corresponding reference coverage area are in the overlap area newly added in the preset duration.
3. A satellite handoff method, applied to a target satellite gateway station, comprising:
under the condition of receiving first information, before the switching moment, establishing a target satellite cell at the target satellite gateway station according to the first information; the target satellite cell is a satellite cell with configuration parameters identical to those of the satellite cell of the satellite at the original satellite gateway station; the first information includes: the configuration parameters of the satellite cell of the satellite under the original satellite gateway station;
under the condition of receiving second information, before the switching moment, completing the establishment of the context information of the target terminal under the target satellite gateway station according to the second information, and establishing a user bearer with a target core network; the target terminal is a terminal in a coverage area of a satellite cell of the satellite on the ground at the switching moment; the target core network is a core network to which the target satellite gateway station belongs; the second information includes: the context information of the target terminal under the original satellite gateway station;
under the condition that the target core network and the prokaryotic core network are different core networks, third information is sent to the target core network at the switching moment; the third information is used for indicating the target core network, establishing context information of the target terminal under the target core network before the switching moment, and establishing user bearing between the target terminal and the target satellite gateway before the switching moment;
and sending first indication information to the original satellite gateway station at the switching moment, wherein the first indication information is used for indicating that the target satellite gateway station and the target core network finish the preparation for switching the satellite.
4. The method of claim 3, further comprising:
at the switching time, a feeder link is established with the satellite.
5. The method of claim 4, further comprising, after establishing a feeder link with the satellite at the handoff time:
and synchronizing uplink and downlink time with the target terminal.
6. A satellite switching method is applied to a target core network, wherein the target core network is a core network to which a target satellite gateway station belongs, and the method comprises the following steps:
under the condition that the target core network and the prokaryotic core network are different core networks, under the condition that first information is received, a request is sent to the original core network; the request is used for requesting the original core network to send context information of a target terminal under the prokaryotic core network; the first information is used for indicating the target core network to establish the context information of the target terminal under the target core network before the switching moment, and establishing user bearing with the target satellite gateway before the switching moment; the target terminal is a terminal in the ground coverage area of the satellite cell of the satellite at the switching moment;
under the condition of receiving response information sent by the original core network, establishing context information of the target terminal under the target core network according to the response information; the response information includes: context information of the target terminal under the prokaryotic core network;
and under the condition of receiving the first information, establishing user bearing between the target satellite gateway and the target satellite before the switching moment.
7. A satellite switching apparatus, applied to a primary satellite gateway station, comprising:
the determining module is used for determining a target satellite gateway station and switching time; the switching time is the time when the satellite is switched from the original satellite gateway station to the target satellite gateway station;
a sending module, configured to send first information and second information to the target satellite gateway station before the handover time, where the first information is used to instruct the target satellite gateway station to establish a target satellite cell before the handover time, and the target satellite cell is a satellite cell with configuration parameters that are the same as those of a satellite cell of the satellite in the original satellite gateway station; the first information includes: the configuration parameters of the satellite cell of the satellite under the original satellite gateway station;
the second information is used for indicating that: before the switching moment, the target satellite gateway station establishes context information of a target terminal under the target satellite gateway station, and indicates the target satellite gateway station to establish user bearing with a target core network before the switching moment; the target terminal is a terminal in a coverage area of a satellite cell of the satellite on the ground at the switching moment; the target core network is a core network to which the target satellite gateway station belongs; the second information includes: the context information of the target terminal under the original satellite gateway station;
the receiving module is used for receiving first indication information sent by the target satellite gateway station before the switching time; the first indication information is used for indicating that the target satellite gateway station and the target core network complete the preparation for switching the satellite.
8. The apparatus of claim 7, wherein the means for sending second information to the target satellite gateway station prior to the handoff time comprises:
the sending module is specifically configured to determine coverage areas of each satellite cell of the satellite on the ground at the handover time to obtain a plurality of reference coverage areas;
in the satellite motion process, the earliest moment in moments when the actual coverage area of each satellite cell of the satellite on the ground is tangent to the corresponding reference coverage area is used as a reference moment;
sending target information to the target satellite gateway station from the reference time to the switching time at intervals of preset time; the target information includes: the context information of the terminal to be processed under the original satellite gateway station; and the terminal to be processed is a terminal of which the actual coverage area and the corresponding reference coverage area are in the overlap area newly added in the preset duration.
9. A satellite switching apparatus, for use in a target satellite gateway station, comprising:
the first establishing module is used for establishing a target satellite cell at the target satellite gateway station according to the first information before the switching time under the condition of receiving the first information; the target satellite cell is a satellite cell with configuration parameters identical to those of the satellite cell of the satellite at the original satellite gateway station; the first information includes: the configuration parameters of the satellite cell of the satellite under the original satellite gateway station;
the second establishing module is used for completing the establishment of the context information of the target terminal under the target satellite gateway station according to the second information and establishing user bearing with a target core network under the condition of receiving the second information and before the switching moment; the target terminal is a terminal in a coverage area of a satellite cell of the satellite on the ground at the switching moment; the target core network is a core network to which the target satellite gateway station belongs; the second information includes: the context information of the target terminal under the original satellite gateway station;
a first sending module, configured to, in a case where the target core network and the prokaryotic core network are different core networks, send third information to the target core network before the handover time; the third information is used for indicating the target core network, establishing context information of the target terminal under the target core network before the switching moment, and establishing user bearing between the target terminal and the target satellite gateway before the switching moment;
a second sending module, configured to send first indication information to the original satellite gateway station at the handover time, where the first indication information is used to indicate that the target satellite gateway station and the target core network have completed preparation for handover of the satellite.
10. A satellite switching apparatus, applied to a target core network, wherein the target core network is a core network to which a target satellite gateway station belongs, and the apparatus comprises:
a sending module, configured to send a request to the original core network when receiving first information in a case where the target core network and the prokaryotic core network are different core networks; the request is used for requesting the original core network to send context information of a target terminal under the prokaryotic core network; the first information is used for indicating the target core network to establish the context information of the target terminal under the target core network before the switching moment, and establishing user bearing with the target satellite gateway before the switching moment; the target terminal is a terminal in the ground coverage area of the satellite cell of the satellite at the switching moment;
a first establishing module, configured to establish context information of the target terminal in the target core network according to response information sent by the original core network when the response information is received; the response information includes: context information of the target terminal under the prokaryotic core network;
and the second establishing module is used for establishing user bearing with the target satellite gateway before the switching time under the condition of receiving the first information.
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| CN112887005B (en) * | 2021-01-06 | 2022-11-15 | 成都天奥集团有限公司 | Full-exchange method and device for eliminating satellite switching influence |
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