CN111314981A - Terminal reselection method and device for feeder link switching - Google Patents
Terminal reselection method and device for feeder link switching Download PDFInfo
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- H—ELECTRICITY
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
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- H04B7/18513—Transmission in a satellite or space-based system
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- H04W36/0055—Transmission or use of information for re-establishing the radio link
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- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
- H04B7/18541—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for handover of resources
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- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
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Abstract
The application provides a terminal reselection method and device for feeder link switching. Wherein, the method comprises the following steps: determining a target gateway station when the target satellite performs the next feed link switching according to the ephemeris information of the target satellite and the networking information of each gateway station; sending a feed link switching request to a target gateway station, wherein the request carries switching information of a feed link; receiving a confirmation message of a feed link switching request sent by a target gateway station, wherein the message comprises target cell information of a target cell covered by a target satellite after the next feed link switching is carried out by the target satellite; and broadcasting the feeder link switching information in the current coverage cell of the target satellite, wherein the information is used for informing the terminal in the current coverage cell to synchronize to the target cell according to the feeder link switching information. Network resources can be fully utilized, a large number of terminals in an overlapping area covered by satellite signals are prevented from being reselected back and forth frequently, collective blind search caused by downlink desynchronization of the terminals is improved, and signal recovery speed is increased.
Description
Technical Field
The present invention relates to the field of low earth orbit satellite mobile communications, and in particular, to a terminal reselection method and apparatus for feeder link switching.
Background
In a low earth orbit satellite mobile communication system, there are several satellites in each orbital plane, which move at high speed along a fixed orbital plane. During high speed movement, the low earth orbit satellite disconnects the feeder link with the current gateway station and establishes a connection with a new gateway station to form a new feeder link. This causes a momentary interruption of the signal to the terminals in the cell under the satellite coverage.
If the terminal is in an overlapping area of coverage by multiple satellite signals, a collective back-and-forth reselection may occur. For some terminals, the terminals may not be in the signal coverage area of other satellites, and after the satellite performs the feeder link switching, the terminals may be in a downlink out-of-step state.
To reconnect to the network, the terminal searches for a new cell by means of full-band blind search to recover the signal. Therefore, no matter a large number of terminals reselect back and forth frequently, or a large number of terminals initiate a registration process due to downlink desynchronization, network congestion and slow signal recovery can be caused.
Disclosure of Invention
In view of this, an object of the embodiments of the present application is to provide a terminal reselection method and apparatus for feeder link switching, which are used to solve the problems of frequent re-reselection of a large number of terminals in an overlapping area covered by multiple satellite signals, network congestion caused by blind search performed during registration initiated by downlink desynchronization of a large number of terminals, and slow signal recovery.
In a first aspect, a terminal reselection method for feeder link switching provided in an embodiment of the present application includes:
determining a target gateway station when the target satellite performs the next feed link switching according to the ephemeris information of the target satellite and the networking information of each gateway station;
sending a feed link switching request to the target gateway station, wherein the switching request carries switching information of the feed link switching;
receiving a confirmation message of the feeder link switching request sent by the target gateway station, wherein the confirmation message comprises target cell information of a target cell covered by the target satellite after the target satellite performs the next feeder link switching;
and broadcasting feed link switching information in the current coverage cell of the target satellite, wherein the feed link switching information is used for informing a terminal in the current coverage cell to synchronize to the target cell according to the feed link switching information.
Optionally, the feeder link switching information comprises: at least one of indication identification bit of feeder link switching, system frame number of switching start, switching duration, target cell frequency point, target cell identification and target cell synchronization information.
Optionally, the determining, according to ephemeris information of the target satellite and network deployment information of each gateway station, a target gateway station when the target satellite performs the next feeder link switching includes:
calculating the distance between each gateway station and the target satellite according to the ephemeris information of the target satellite and the networking information of each gateway station;
and selecting the gateway station closest to the target satellite according to the distance between each gateway station and the target satellite, and taking the closest gateway station as the target gateway station.
According to the terminal reselection method for feeder link switching in the embodiment, the gateway station closest to the target satellite is quickly screened out as the target gateway station based on the ephemeris information of the target satellite and the network deployment information of each gateway station. Because the target gateway station is closest to the target satellite, the signal is strongest, and the effects of quick connection and strong signal between the target gateway station and the target satellite can be realized.
Optionally, the determining, according to ephemeris information of the target satellite and network deployment information of each gateway station, a target gateway station when the target satellite performs the next feeder link switching includes:
calculating the visible time of each gateway station and the target satellite according to the ephemeris information of the target satellite and the networking information of each gateway station;
and selecting the gateway station with the longest visible time with the target satellite according to the visible time of each gateway station and the target satellite, and taking the gateway station with the longest visible time as the target gateway station.
According to the terminal reselection method for feeder link switching in the embodiment, the gateway station with the longest visible time with the target satellite is quickly screened out as the target gateway station based on the ephemeris information of the target satellite and the network deployment information of each gateway station. Because the visible time of the target gateway station and the target satellite is longest, the target gateway station and the target satellite can be quickly connected, the connection time is long, and the effect of reducing the switching times of the feeder link is achieved.
In a second aspect, another terminal reselection method for feeder link switching provided by the embodiments of the present application is applied to an electronic terminal, where the electronic terminal is communicatively connected to a source gateway station, and the method includes:
receiving feed link switching information sent by the source gateway station, wherein the feed link switching information comprises target cell information of a target cell covered by a target satellite after the target satellite carries out next feed link switching, and the electronic terminal is an electronic terminal in a current covered cell of the target satellite;
and carrying out synchronous processing with the target cell according to the target cell information.
Optionally, the feeder link switching information comprises: at least one of indication identification bit of feeder link switching, system frame number of switching start, switching duration, target cell frequency point, target cell identification and target cell synchronization information.
According to the terminal reselection method for feeder link switching in the embodiment, the indicator bit is used for determining the scene of feeder link switching. The system frame number is used to determine the time point of the feeder link switching. The switching duration is used to define a switching time limit. The target cell frequency point is used for the electronic terminal to adjust the frequency point of the terminal to be used as reference, and is used for guiding the terminal to adjust the frequency point of the terminal to be consistent with the frequency point of the target cell. The target cell identifier is used to guide the electronic terminal to search for the target cell. The target cell synchronization information is used to direct the electronic terminal to synchronize to the target cell.
Optionally, the performing, according to the target cell information, synchronization processing with the target cell includes:
starting a handoff continuation timer when the target satellite starts the next feeder link handoff;
and carrying out synchronous processing with the target cell according to the target cell information within the limited time of the switching duration timer.
According to the terminal reselection method for feeder link switching in the present embodiment, the electronic terminal resides in the source gateway station cell, and receives feeder link switching information from the source gateway station cell. The electronic terminal starts a persistence timer according to the information while the feeder link switching occurs, and synchronizes to the target gateway station cell within the time timed by the timer. Therefore, the terminal can synchronize to the target cell in order according to the instruction.
Optionally, the method further comprises: if the synchronization to the target cell is not successful within the limited time of the handover duration timer, performing initial cell selection to re-synchronize to any target cell covered by the target satellite.
According to the terminal reselection method for feeder link switching in the embodiment, when the feeder link switching process is started, a persistent timer is started, and within the time timed by the timer, if the electronic terminal is not synchronized to the target cell, the electronic terminal performs initial cell selection, performs blind search, and resynchronizes to the target cell. Therefore, an abnormal recovery mechanism can be provided for the terminal with synchronization failure, and the terminal can be ensured to recover through initial cell selection.
In a third aspect, the present application provides a terminal reselection apparatus for feeder link switching, including:
the determining module is used for determining a target gateway station corresponding to the next feed link switching of the target satellite according to the ephemeris information of the target satellite and the networking information of each gateway station;
a sending module, configured to send a feeder link switching request to the target gateway station, where the switching request carries switching information for the feeder link switching;
a first receiving module, configured to receive a confirmation message of the feeder link handover request sent by the target gateway station, where the confirmation message includes target cell information corresponding to the target satellite after handover;
and a broadcasting module, configured to broadcast, according to the target cell information, feeder link switching information to a target cell corresponding to the target cell information, where the feeder link switching information is used to notify a terminal in the target cell to synchronize to the target cell according to the feeder link switching information.
In a fourth aspect, the present application provides another terminal reselection apparatus for feeder link switching, applied to an electronic terminal, the electronic terminal being communicatively connected to a source gateway station, the feeder link switching including:
a second receiving module, configured to receive feeder link switching information sent by the source gateway station, where the feeder link switching information includes target cell information corresponding to a target satellite after switching;
and the synchronization module is used for carrying out synchronization processing on the target cell corresponding to the target cell information according to the target cell information.
The source gateway station broadcasts information on feeder link switching to the terminals in the corresponding initial cell. The terminal resides in a cell covered by the source gateway station and receives and stores information of feeder link switching broadcast by the source gateway station. When the target satellite establishes a new feeder link with the target gateway station, the terminal connects to the target cell according to the information about the feeder link handover. The method can make full use of network resources, avoid frequent reselection of a large number of terminals in an overlapping area covered by satellite signals, improve collective blind search of the large number of terminals caused by downlink desynchronization, and improve the signal recovery speed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic operating environment diagram of a terminal reselection method for feeder link switching according to an embodiment of the present application.
Fig. 2 is a block diagram of a gateway station according to an embodiment of the present application.
Fig. 3 is a flowchart of a terminal reselection method for feeder link switching according to an embodiment of the present disclosure.
Fig. 4 is a diagram of calculating an elevation angle of a gateway station and a satellite position according to an embodiment of the present invention.
Fig. 5 is a functional module schematic diagram of a terminal reselection device for feeder link switching according to an embodiment of the present application.
Fig. 6 is a flowchart of another terminal reselection method for feeder link switching according to an embodiment of the present application.
Fig. 7 is a detailed flowchart of step 402 of a terminal reselection method for feeder link switching according to an embodiment of the present application.
Fig. 8 is a functional module schematic diagram of another terminal reselection device for feeder link switching according to an embodiment of the present application.
Fig. 9 is a flowchart of another method for reselecting a terminal for feeder link handover according to an embodiment of the present application.
Icon: 100-source gateway station; 200-a target gateway station; 300-a terminal; 111-a memory; 112-a memory controller; 113-a processor; 114-peripheral interfaces; 310-a determination module; 320-a sending module; 330-a first receiving module; 340-a broadcast module; 510-a second receiving module; 520-synchronization Module.
Detailed Description
The technical solution in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
In the low earth orbit satellite mobile communication system, each orbit plane has several satellites, these satellites move at high speed along the fixed orbit plane and radiate out zonal coverage cells on the earth surface, the cells of different orbit planes have overlapping regions, and the air interface links of the satellites include user links and feeder links.
Since the low earth orbit satellite is in high speed motion relative to the ground, when the satellite flies out of the control range of the current gateway station, the feeder link between the satellite and the current gateway station is interrupted, and a connection is established with a new gateway station, in the process, signals of all terminals in a cell under the coverage of the satellite are instantaneously interrupted. When the satellite is switched over, most terminals in the cell covered by the target satellite are still in the coverage area of the satellite before and after the switch over of the feeder link occurs.
When the feeder link is switched, downlink desynchronization occurs to the terminal in an idle state, and then a new cell is searched through an initial cell selection or cell selection mode. The terminal behaviors can be roughly divided into two types, one type is located in the center of a cell and is not covered by a neighboring cell signal, the terminal can only carry out full-band blind search to find a new cell, the other type is located at the edge of the cell and is covered by the neighboring cell signal, and the terminal can measure the neighboring cell signal and select the neighboring cell through an initial cell to obtain service. For the first type of terminal, because the full-band blind search is executed, when the satellite is switched to a new feeder link and recovers the coverage cell signal, a new cell can be detected and resided, and the cell search relative to the known prior information is detected in a blind mode; for the second kind of terminals, because the new cell is reselected, and because the new cell belongs to different registration areas, the terminal will initiate a registration process in the new cell, and after the satellite switches to a new feeder link and recovers its coverage cell signal, reselect to the original cell and initiate re-registration in the original cell.
Based on the above research, the present application provides a method and an apparatus for reselecting a terminal for feeder link handover, which can solve the technical problems in the above statements. The following is a detailed description by way of several specific examples.
Example one
To facilitate understanding of the present embodiment, a detailed description will be given of a structure for performing the low earth orbit satellite mobile communication disclosed in the embodiments of the present application.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating an operating environment of a terminal reselection method for feeder link switching according to an embodiment of the present application.
As shown in fig. 1, the operating environment of the terminal reselection method for feeder link switching provided by the present embodiment may include one or more satellite motion orbital planes (two are shown in the figure).
Wherein, each satellite motion orbital plane can be operated by one or more satellites.
The air interface link of each satellite includes a user link and a feeder link. Wherein a user link refers to a communication link between a satellite and the terminal 300. A feeder link refers to a communication link between a satellite and a gateway station on the surface of the earth. The various gateway stations on the earth's surface may be connected by physical interfaces or may be connected by way of wireless communication.
During the high speed movement of the satellite on the orbit, a feeder link switching occurs, i.e. when the satellite flies out of the control range of the source gateway station 100, the feeder link with the source gateway station 100 is interrupted and connected to the target gateway station 200 to establish a new feeder link.
When a feeder link switch occurs, the terminal 300 may experience a brief network outage. To restore the signal connection, the terminal 300 performs a reselection operation to connect to a new cell to connect to the network.
For the convenience of further understanding of the present embodiment, the gateway station in the low earth orbit satellite mobile communication according to the embodiment of the present application is further described.
Referring to fig. 2, fig. 2 is a block diagram of a gateway station according to an embodiment of the present application. The gateway station shown in fig. 2 will be explained in detail below.
The gateway station may include a memory 111, a memory controller 112, a processor 113, and a peripheral interface 114. It will be understood by those skilled in the art that the structure shown in fig. 2 is merely illustrative and is not intended to limit the structure of a gateway station. For example, the gateway station may also include more or fewer components than shown in fig. 2, or have a different configuration than shown in fig. 2.
The aforementioned elements of the memory 111, memory controller 112, processor 113 and peripheral interface 114 are electrically connected to each other directly or indirectly to enable data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The processor 113 is used to execute the executable program stored in the memory 111.
The Memory 111 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory 111 is used for storing a program, and the processor 113 executes the program after receiving an execution instruction. In the process disclosed in any of the embodiments of the present application, the above-mentioned terminal reselection method for feeder link switching performed by the gateway station may be applied in the processor 113, or implemented by the processor 113.
The processor 113 may be an integrated circuit chip having signal processing capability. The Processor 113 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the Integrated Circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The peripheral interface 114 couples various input/output devices to the processor 113 and memory 111. In some embodiments, the peripheral interface 114, the processor 113, and the memory controller 112 may be implemented in a single chip. In other examples, they may be implemented separately from the individual chips.
The gateway station in this embodiment may be configured to perform each step in each method provided in this embodiment. The implementation process of the terminal reselection method for feeder link switching provided by the present application is described in detail below through several embodiments.
Example two
Please refer to fig. 3, which is a flowchart illustrating a method for reselecting a terminal for feeder link handover according to an embodiment of the present application. The specific flow shown in fig. 3 will be described in detail below. In this embodiment, the terminal reselection method for feeder link switching is applied to a source gateway station, and the method may include the following steps.
In one embodiment, the regular switching of the feeder links occurs during high speed movement of the low earth orbit satellites. The law is divided into the shortest feeder link switching and the longest visible time switching.
Illustratively, in the shortest feeder link handover, when the target satellite moves into the region to be served, the gateway station with the strongest received signal power is selected as the target gateway station. And the source gateway station determines a target gateway station when the target satellite carries out the next feed link switching according to the feed link switching rule.
For example, in the shortest feeder link handover, when the satellite moves into an area to be served, the distance between each gateway station and the target satellite is calculated according to ephemeris information of the target satellite and networking information of each gateway station.
And the source gateway station selects the gateway station closest to the target satellite according to the distance between each gateway station and the target satellite, and takes the gateway station as the target gateway station.
For example, in the longest visible time handover, when the satellite moves into the region to be served, the length of the visible time between each gateway station and the target satellite is calculated according to the ephemeris information of the target satellite and the networking information of each gateway station.
Illustratively, as shown in FIG. 4, points A are satellite positions, points C are gateway station positions, points D are gateway station projections on the orbital plane, and points O are the earth centroid, α and α′The earth center angles corresponding to the points C and D respectively, β is the satellite down-view angle, omega is the elevation angle, gamma is the side-view angle, r is the earth radius, and h is the orbit height.
The distance of AD can be derived from the geometry in fig. 4 as:
CD is approximated to the track surface normal direction:
according to trigonometric theorem, we can get:
further, the antenna elevation angle ω can be obtained:
after the satellite position is calculated according to the ephemeris information, parameters α, β and h can be obtained by combining the position information of the gateway station, and then the antenna elevation angle omega can be calculated according to the formulas (2) and (5).
The source gateway station decides when to perform feeder link switching based on the elevation angle with the satellite, e.g., when the elevation angle is less than or equal to pi/36, it is deemed that feeder link switching is required. When the source gateway station meets the feed link switching condition, the source gateway station can calculate the elevation angles of other adjacent gateway stations and the satellite according to the network arrangement information of the gateway station and the position of the satellite to be subjected to the feed link switching by combining the position of the satellite to be subjected to the feed link switching, the maximum elevation angle is the longest visible time, and the source gateway station selects the target gateway station with the maximum elevation angle for switching.
When the feeder link is selected, the gateway station with the closest distance or the strongest received signal power is abandoned, and the gateway station with the longest visible time is selected as the target gateway station. Step 202, sending a feeder link switching request to the target gateway station, where the switching request carries switching information of the feeder link switching.
In one embodiment, a plurality of gateway stations are distributed on the ground, each of which is connectable to a target satellite for a feeder link. Each gateway station is connected with each other through a physical interface.
Illustratively, when the source gateway station determines the target gateway station for the next feeder link switch, the source gateway station sends the target satellite's ID (identity), the time of initiation of the feeder link switch, to the target gateway station via the physical connection between the gateway stations.
The confirmation message may include target cell information of a target cell covered by the target satellite after the target satellite performs the next feeder link handover.
In one embodiment, the target gateway station receives a feeder link handover request from the source gateway station and sends acknowledgement information of the feeder link handover request to the source gateway station based on the feeder link handover request.
Illustratively, the target gateway station performs a confirmation process on the received ID of the target satellite and the starting time of the feeder link switching.
Illustratively, the target gateway station is overlaid with a plurality of target cells. And the target gateway station arranges the frequency point of the target cell covered by the target gateway station and the ID of the target cell.
Illustratively, the target gateway station, upon receiving the feeder link switch request, sends an acknowledgement of the feeder link switch request to the source gateway station over the physical connection between the gateway stations based on the feeder link switch request. The confirmation information comprises the ID of the target satellite, the frequency point of the target cell covered by the target gateway station and the ID of the target cell.
And the feeder link switching information is used for informing the terminal in the current coverage cell to synchronize to the target cell according to the feeder link switching information.
In one embodiment, the source gateway station broadcasts feeder link handover information in the current coverage cell of the target satellite after receiving confirmation of the feeder link handover request from the target gateway station. The feeder link switching information is used to guide the terminal to perform a terminal reselection operation.
Optionally, the feeder link switching information may include: at least one of indication identification bit of feeder link switching, system frame number of switching start, switching duration, target cell frequency point, target cell identification and target cell synchronization information.
The indicator flag is used to determine the scenario of feeder link switching. The system frame number is used to determine the time point of the feeder link switching. The switching duration is used to define a switching time limit. The target cell frequency point is used for the electronic terminal to adjust the frequency point of the terminal to be used as reference, and is used for guiding the terminal to adjust the frequency point of the terminal to be consistent with the frequency point of the target cell. The target cell identifier is used to guide the electronic terminal to search for the target cell. The target cell synchronization information is used for guiding the electronic terminal to synchronize to the target cell and reside in the target cell.
The terminal can be guided to reselect to the target cell through the feeder link switching information, so that the terminal can reselect to the designated cell visually after the satellite performs feeder link switching.
Example III
Based on the same application concept, the embodiment of the present application further provides a terminal reselection device for feeder link switching corresponding to the method shown in the second embodiment. The apparatus may be applied to a source gateway station, and the apparatus may form part or all of a terminal in a form of hardware or software or a combination of the two, and since a principle of the apparatus in the embodiment of the present application to solve a problem is similar to the foregoing embodiment of the terminal reselection method for feeder link switching, the apparatus in the embodiment may be implemented as described in the foregoing embodiment of the method, and repeated details are omitted.
Please refer to fig. 5, which is a functional block diagram of a terminal reselection apparatus for feeder link switching according to an embodiment of the present application. The terminal reselection device for feeder link switching in this embodiment is applied to a source gateway station, and various modules in the device are used for executing various steps in the second embodiment of the method. The above-mentioned terminal reselection apparatus for feeder link switching may comprise: a determination module 310, a transmission module 320, a first receiving module 330, and a broadcasting module 340.
The determining module 310 is configured to determine a target gateway station corresponding to the next feeder link switching of the target satellite according to the ephemeris information of the target satellite and the networking information of each gateway station.
A sending module 320, configured to send a feeder link switching request to the target gateway station, where the switching request carries switching information for the feeder link switching.
A first receiving module 330, configured to receive a confirmation message of the feeder link handover request sent by the target gateway station, where the confirmation message includes target cell information corresponding to the target satellite after handover.
A broadcasting module 340, configured to broadcast, according to the target cell information, feeder link switching information to a target cell corresponding to the target cell information, where the feeder link switching information is used to notify a terminal in the target cell to synchronize to the target cell according to the feeder link switching information.
Optionally, the feeder link switching information comprises: at least one of indication identification bit of feeder link switching, system frame number of switching start, switching duration, target cell frequency point, target cell identification and target cell synchronization information.
In one possible implementation, applied to the source gateway station, the determining module 310 is further configured to:
calculating the distance between each gateway station and the target satellite according to the ephemeris information of the target satellite and the networking information of each gateway station;
and selecting the gateway station closest to the target satellite according to the distance between each gateway station and the target satellite, and taking the closest gateway station as the target gateway station.
In one possible implementation, applied to the source gateway station, the determining module 310 is further configured to:
calculating the visible time of each gateway station and the target satellite according to the ephemeris information of the target satellite and the networking information of each gateway station;
and selecting the gateway station with the longest visible time with the target satellite according to the visible time of each gateway station and the target satellite, and taking the gateway station with the longest visible time as the target gateway station.
Example four
Please refer to fig. 6, which is a flowchart of another terminal reselection method for feeder link switching according to an embodiment of the present application, and is applied to a terminal. The terminal reselection method for feeder link switching provided in the present embodiment includes the following steps.
The method comprises the steps that the electronic terminal is in a current coverage cell of a target satellite, and the feed link switching information comprises target cell information of the target cell covered by a target satellite after the target satellite performs the next feed link switching.
In one embodiment, the terminal receives feeder link switching information from the source gateway station and stores the received feeder link switching information.
Optionally, the feeder link switching information comprises: at least one of indication identification bit of feeder link switching, system frame number of switching start, switching duration, target cell frequency point, target cell identification and target cell synchronization information.
In one embodiment, as shown in FIG. 7, step 402 may comprise:
In another embodiment, the terminal adjusts its own frequency point according to the frequency point of the target cell and the target cell ID.
Illustratively, when the target satellite initiates the next feeder link handoff, the source gateway station starts a handoff duration timer that sets a time range value. And simultaneously, the terminal adjusts the frequency point of the terminal and switches to a target cell corresponding to the target gateway station within the time range of the timer.
Illustratively, the terminal performs a soft handover during the handover procedure. In the switching process, the terminal adjusts the frequency point of the terminal, establishes connection with the target cell within a specified time, and then disconnects the connection with the source cell. The terminal and the gateway station are always connected to ensure uninterrupted network.
Illustratively, the terminal performs a hard handoff during the handoff process. In the switching process, the terminal is disconnected with the source cell, then the frequency point of the terminal is adjusted, the terminal is connected with the target cell, a very short time is provided in the middle, and the mobile phone and the base station are completely disconnected.
On the basis of the above steps, the method for reselecting a terminal for feeder link switching according to this embodiment may further include:
in step 403, if the synchronization to the target cell is not successful within the limited time of the handover duration timer, an initial cell selection operation is performed to re-synchronize to any target cell covered by the target satellite.
In one embodiment, if some terminals cannot handover to the target cell and cannot establish connection with the target cell within a specified time, all the cells around the terminals are subjected to full-band search.
Illustratively, the terminal searches for a cell with the same frequency as itself and establishes a connection therewith. Or the terminal searches the cell with the strongest signal and adjusts the frequency point of the terminal to establish connection with the cell.
EXAMPLE five
Based on the same application concept, the embodiment of the present application further provides a terminal reselection device for feeder link switching corresponding to the terminal reselection method for feeder link switching provided in the fourth embodiment. The apparatus is applied to a terminal, and the apparatus may form part or all of the terminal in a form of hardware or software or a combination of the two, and since the principle of the apparatus in the embodiment of the present application to solve the problem is similar to the foregoing embodiment of the terminal reselection method for feeder link switching, the apparatus in the embodiment may be implemented as described in the foregoing embodiment of the method, and repeated details are omitted.
Please refer to fig. 8, which is a functional block diagram of a terminal reselection apparatus for feeder link switching according to an embodiment of the present application. The respective modules in the feeder-link switching device in this embodiment are configured to perform the respective steps in the fourth embodiment of the method described above. The feeder link switching device includes: a second receiving module 510, a synchronization module 520.
A second receiving module 510, configured to receive feeder link switching information sent by the source gateway station, where the feeder link switching information includes target cell information corresponding to a target satellite after switching.
A synchronization module 520, configured to perform synchronization processing on a target cell corresponding to the target cell information according to the target cell information.
Optionally, the feeder link switching information comprises: at least one of indication identification bit of feeder link switching, system frame number of switching start, switching duration, target cell frequency point, target cell identification and target cell synchronization information.
In a possible implementation, the second receiving module 510 of the terminal is configured to receive feeder link handover information sent by the source gateway station, and after receiving the feeder link handover information, the terminal synchronizes to the target cell through soft handover or hard handover.
In one possible implementation, the synchronization module 520 is configured to:
starting a handoff continuation timer when the target satellite starts the next feeder link handoff;
and carrying out synchronous processing with the target cell according to the target cell information within the limited time of the switching duration timer.
In one possible embodiment, the feeder link switching apparatus further includes:
and the reselection module is used for performing initial cell selection operation to resynchronize to any target cell covered by the target satellite if the target cell is not successfully synchronized within the limited time of the switching duration timer.
EXAMPLE six
Referring to fig. 9, another method for reselecting a terminal for feeder link handover is provided in the embodiments of the present application. The method in this embodiment is similar to the terminal reselection methods for feeder link switching provided in the second and fourth embodiments, and the terminal reselection method for feeder link switching provided in this embodiment may be applied to a communication system including a source gateway station, a target gateway station, and a terminal. The specific flow of the method shown in fig. 8 will be described in detail below.
601, the source gateway station determines a target gateway station when the target satellite performs the next feed link switching according to the ephemeris information of the target satellite and the networking information of each gateway station;
in step 604, the source gateway station broadcasts feeder link switching information in the current coverage cell of the target satellite.
And the feeder link switching information is used for informing the terminal in the current coverage cell to synchronize to the target cell according to the feeder link switching information. For example, the feeder link switching information may include: at least one of indication identification bit of feeder link switching, system frame number of switching start, switching duration, target cell frequency point, target cell identification and target cell synchronization information.
The feed link switching information comprises target cell information of a target cell covered by a target satellite after the next feed link switching of the target satellite is carried out, and the electronic terminal is an electronic terminal in a current coverage cell of the target satellite.
In summary, the present application provides a terminal reselection method and apparatus for feeder link switching, which are applied to low earth orbit satellite mobile communication. And determining the target gateway station when the target satellite performs the next feeder link switching according to the ephemeris information of the target satellite and the networking information of each gateway station. And sending a feed link switching request to the target gateway station, wherein the switching request carries switching information of the feed link switching. Receiving a confirmation message of the feeder link switching request sent by the target gateway station, wherein the confirmation message comprises target cell information of a target cell covered by the target satellite after the target satellite performs the next feeder link switching. And broadcasting feed link switching information in the current coverage cell of the target satellite, wherein the feed link switching information is used for informing a terminal in the current coverage cell to synchronize to the target cell according to the feed link switching information. A large number of terminals in an overlapping area covered by satellite signals can be prevented from being reselected back and forth frequently, collective blind search caused by downlink desynchronization of the terminals is improved, network resources can be fully utilized, and the signal recovery speed is increased.
Furthermore, an embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and the computer program is executed by a processor to perform the steps of the terminal reselection method for feeder link switching described in the second or fourth embodiment of the foregoing method.
The computer program product of the terminal reselection method for feeder link switching provided in the embodiment of the present application includes a computer-readable storage medium storing a program code, where instructions included in the program code may be used to execute steps of the terminal reselection method for feeder link switching described in the above method embodiment, which may be specifically referred to in the above method embodiment and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: 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. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method of terminal reselection for feeder link switching, the method comprising:
determining a target gateway station when the target satellite performs the next feed link switching according to the ephemeris information of the target satellite and the networking information of each gateway station;
sending a feed link switching request to the target gateway station, wherein the switching request carries switching information of the feed link switching;
receiving a confirmation message of the feeder link switching request sent by the target gateway station, wherein the confirmation message comprises target cell information of a target cell covered by the target satellite after the target satellite performs the next feeder link switching;
and broadcasting feed link switching information in the current coverage cell of the target satellite, wherein the feed link switching information is used for informing a terminal in the current coverage cell to synchronize to the target cell according to the feed link switching information.
2. The method of claim 1, applied to a source gateway station; the feeder link switching information includes: at least one of indication identification bit of feeder link switching, system frame number of switching start, switching duration, target cell frequency point, target cell identification and target cell synchronization information.
3. The method of claim 1, applied to a source gateway station; the method for determining the target gateway station when the target satellite performs the next feeder link switching according to the ephemeris information of the target satellite and the networking information of each gateway station comprises the following steps:
calculating the distance between each gateway station and the target satellite according to the ephemeris information of the target satellite and the networking information of each gateway station;
and selecting the gateway station closest to the target satellite according to the distance between each gateway station and the target satellite, and taking the closest gateway station as the target gateway station.
4. The method of claim 1, applied to a source gateway station; the method for determining the target gateway station when the target satellite performs the next feeder link switching according to the ephemeris information of the target satellite and the networking information of each gateway station comprises the following steps:
calculating the visible time of each gateway station and the target satellite according to the ephemeris information of the target satellite and the networking information of each gateway station;
and selecting the gateway station with the longest visible time with the target satellite according to the visible time of each gateway station and the target satellite, and taking the gateway station with the longest visible time as the target gateway station.
5. A method of terminal reselection for feeder link switching, applied to an electronic terminal communicatively coupled to a source gateway station, the method comprising:
receiving feed link switching information sent by the source gateway station, wherein the feed link switching information comprises target cell information of a target cell covered by a target satellite after the target satellite carries out next feed link switching, and the electronic terminal is an electronic terminal in a current covered cell of the target satellite;
and carrying out synchronous processing with the target cell according to the target cell information.
6. The method according to claim 5, applied to an electronic terminal; the feeder link switching information includes: at least one of indication identification bit of feeder link switching, system frame number of switching start, switching duration, target cell frequency point, target cell identification and target cell synchronization information.
7. The method of claim 5, wherein the performing synchronization with the target cell according to the target cell information comprises:
starting a handoff continuation timer when the target satellite starts the next feeder link handoff;
and carrying out synchronous processing with the target cell according to the target cell information within the limited time of the switching duration timer.
8. The method of claim 7, further comprising:
if the synchronization to the target cell is not successful within the limited time of the handover duration timer, performing an initial cell selection operation to re-synchronize to any target cell covered by the target satellite.
9. A terminal reselection apparatus for feeder link switching, comprising:
the determining module is used for determining a target gateway station corresponding to the next feed link switching of the target satellite according to the ephemeris information of the target satellite and the networking information of each gateway station;
a sending module, configured to send a feeder link switching request to the target gateway station, where the switching request carries switching information for the feeder link switching;
a first receiving module, configured to receive a confirmation message of the feeder link handover request sent by the target gateway station, where the confirmation message includes target cell information corresponding to the target satellite after handover;
and a broadcasting module, configured to broadcast, according to the target cell information, feeder link switching information to a target cell corresponding to the target cell information, where the feeder link switching information is used to notify a terminal in the target cell to synchronize to the target cell according to the feeder link switching information.
10. A terminal reselection apparatus for feeder link switching, applied to an electronic terminal communicatively coupled to a source gateway station, the feeder link switching comprising:
a second receiving module, configured to receive feeder link switching information sent by the source gateway station, where the feeder link switching information includes target cell information corresponding to a target satellite after switching;
and the synchronization module is used for carrying out synchronization processing on the target cell corresponding to the target cell information according to the target cell information.
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