CN111786710B - Switching method, communication equipment, terminal equipment and storage medium - Google Patents
Switching method, communication equipment, terminal equipment and storage medium Download PDFInfo
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- CN111786710B CN111786710B CN201910269607.2A CN201910269607A CN111786710B CN 111786710 B CN111786710 B CN 111786710B CN 201910269607 A CN201910269607 A CN 201910269607A CN 111786710 B CN111786710 B CN 111786710B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
Abstract
The application discloses a switching method, communication equipment, terminal equipment and a storage medium, which are used for providing a new switching method of a feeder link so as to reduce the time delay of switching. The switching method comprises the following steps: the source gateway station determining a channel quality of at least one terminal device connected to the first satellite; and the source gateway station informs a target gateway station adjacent to the source gateway station of the switching preparation of the feeder link of the first satellite according to the channel quality or the channel quality and the ephemeris information, and informs a terminal device connected with the first satellite of switching from the source gateway station to the target gateway station.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a handover method, a communications device, a terminal device, and a storage medium.
Background
The low earth orbit satellite communication system comprises a satellite, and a terminal device and a gateway station which are connected with the satellite, wherein the terminal device communicates with the gateway station through the satellite. There are two communication modes of the low earth orbit satellite communication system, which are a bent pipe mode and a regenerative communication mode. Referring to fig. 1, in the bent pipe mode, the terminal device communicates with the gateway station through a satellite, and the satellite only transparently forwards the signal without any processing on the signal. Specifically, the satellite forwards the signal to the gateway station after passing through a Low Noise Amplifier (LNA), a frequency conversion and a traveling Wave Tube power Amplifier (TWTA) in sequence. In the regenerative communication mode, the satellite serves as a base station for connecting the terminal device and the gateway station. The satellite may detect signals transmitted by the terminal device and process the detected signals for forwarding to the gateway station. Specifically, the satellite forwards the detected signal to the gateway station after passing through the LNA, frequency conversion, demodulation and decoding, modulation and coding, frequency conversion and TWTA in sequence.
Since the terminal device moves relative to the satellite as the satellite moves around the earth, which results in that the terminal device may move from one satellite coverage area to another, causing a change in the link between the satellite and the user and the connection between the satellite and the gateway station, and therefore a handover of the connection between the terminal device and the satellite and a handover of the connection between the satellite and the gateway station is required. Here, the connection of the terminal device to the satellite is also referred to as a subscriber link, and the connection of the satellite to the gateway station is also referred to as a feeder link. In the user link switching, the terminal equipment can be switched in different satellites to select a proper communication link, and in the feeder link switching, the satellites can be switched in different gateway stations to select a proper gateway station.
Referring to fig. 2, a schematic diagram of feeder link connections, when a satellite is in the middle of two gateway stations, a handoff of the feeder link may occur, and the user link may still be attached to the same satellite. The currently used switching scheme for feeder links is that the gateway station forces the satellite to switch at a predetermined time based on ephemeris information, so that the satellite is connected from one gateway station 1 (source gateway station) to another gateway station 2 (target gateway station), and the terminal equipment attached to the satellite switches accordingly. In fig. 2 the satellite cannot simultaneously transmit data to two gateway stations, so that the connection of the satellite to the gateway station 1 is illustrated by a dashed line. Since the orbits of the satellites are predetermined, the ephemeris information can be used to deduce the position and elevation of the satellites at a certain time, and thus the satellites can be switched based on the ephemeris information. However, in the actual operation process, since the satellite needs to be connected to different gateway stations, during the handover process, signal detection and confirmation are involved, however, both the signal detection and the signal confirmation require time, and in order to ensure that the terminal device keeps normal communication during the handover process, the terminal device under the satellite needs to be handed over, which results in a long handover delay and even causes network link interruption of the terminal device.
Disclosure of Invention
The embodiment of the application provides a switching method, communication equipment, terminal equipment and a storage medium, which are used for providing a new switching method of a feeder link so as to reduce the time delay of switching.
In a first aspect, a handover method is provided, where the method includes:
the source gateway station determining a channel quality of at least one terminal device connected to the first satellite;
and the source gateway station informs a target gateway station adjacent to the source gateway station of the switching preparation of the feeder link of the first satellite according to the channel quality or the channel quality and the ephemeris information, and informs a terminal device connected with the first satellite of switching from the source gateway station to the target gateway station.
Optionally, the determining, by the source gateway station, a channel quality of at least one terminal device under the first satellite includes:
the source gateway station performs Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of the at least one terminal device to obtain a first measurement result;
the source gateway station informs the target gateway station to perform Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of the at least one terminal device to obtain a second measurement result;
the source gateway station receives the second measurement result from the target gateway station and determines a channel quality of at least one terminal device under the first satellite based on the first measurement result and the second measurement result.
Optionally, before the source gateway station performs RRM measurement on the sounding reference signal SRS of the at least one terminal device, the method further includes:
and the source gateway station transmits a first request message to the at least one terminal device through the first satellite, wherein the first request message is used for indicating the at least one terminal device to transmit SRS.
Optionally, before the source gateway station receives the second measurement result from the target gateway station, the method further includes:
and the source gateway station sends the SRS resource configuration information of the at least one terminal device to the target gateway station through the first satellite.
Optionally, the first satellite simultaneously uses at least two antenna arrays and/or radio frequency channels to communicate with the source gateway station and the target gateway station, respectively.
In a second aspect, another handover method is provided, which includes:
the method comprises the steps that terminal equipment receives a first request message from a source gateway station through a first satellite, wherein the first request message is used for indicating the terminal equipment to send SRS;
the terminal device sends the SRS of the terminal device to the source gateway station and the target gateway station through the first satellite, so that the source gateway station informs the target gateway station of switching the gateway station connection of the first satellite from the source gateway station to the target gateway station according to the measurement result of RRM measurement on the SRS of the terminal device, and informs the terminal device of switching from the source gateway station to the target gateway station.
Optionally, the terminal device receives a first request message from the source gateway station through the first satellite, including;
and the terminal equipment receives SRS configuration information sent by the source gateway station through the first satellite.
Optionally, the first satellite simultaneously uses at least two antenna arrays and/or radio frequency channels to communicate with the source gateway station and the target gateway station, respectively.
In a third aspect, a communication device is provided, which includes:
a memory to store instructions;
a processor for reading the instructions in the memory, performing the following processes:
determining a channel quality of at least one terminal device connected to the first satellite;
according to the channel quality or the channel quality and ephemeris information, informing a target gateway station adjacent to the source gateway station to prepare for switching a feeder link of the first satellite, and informing a terminal device connected with the first satellite to switch from the communication device to the target gateway station;
the transceiver is used for transmitting information under the control of the processor.
Optionally, the processor is specifically configured to:
performing Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of the at least one terminal device to obtain a first measurement result;
informing the target gateway station to perform Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of the at least one terminal device to obtain a second measurement result;
receiving the second measurement result from the target gateway station and determining a channel quality of at least one terminal device under the first satellite based on the first measurement result and the second measurement result.
Optionally, the transceiver is specifically configured to:
and sending a first request message to the at least one terminal device through the first satellite, wherein the first request message is used for instructing the at least one terminal device to send the SRS.
Optionally, the transceiver is further configured to:
and sending the SRS resource configuration information of the at least one terminal device to the target gateway station through the first satellite.
Optionally, the first satellite simultaneously uses at least two antenna arrays and/or radio frequency channels to communicate with the communication device and the target gateway station, respectively.
In a fourth aspect, a terminal device is provided, which includes:
a memory to store instructions;
a processor for reading the instructions in the memory, performing the following processes:
receiving a first request message from a source gateway station through a first satellite, wherein the first request message is used for instructing the terminal equipment to transmit SRS;
transmitting, by the first satellite, the SRS of the terminal device to the source gateway station and a target gateway station, such that the source gateway station informs the target gateway station of switching a gateway station connection of the first satellite from the source gateway station to the target gateway station according to a measurement result of RRM measurement on the SRS of the terminal device, and informs the terminal device of switching from the source gateway station to the target gateway station;
the transceiver is used for transmitting information under the control of the processor.
Optionally, the transceiver is specifically configured to:
receiving, via the first satellite, SRS configuration information transmitted from the source gateway station.
Optionally, the first satellite simultaneously uses at least two antenna arrays and/or radio frequency channels to communicate with the source gateway station and the target gateway station, respectively.
In a fifth aspect, there is provided a communication device comprising:
a determining unit for determining a channel quality of at least one terminal device connected to a first satellite;
and a notifying unit, configured to notify, according to the channel quality or according to the channel quality and ephemeris information, a target gateway station adjacent to the source gateway station to prepare for switching of a feeder link of the first satellite, and notify a terminal device connected to the first satellite to switch from the communication device to the target gateway station.
Optionally, the determining unit is specifically configured to:
performing Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of the at least one terminal device to obtain a first measurement result;
informing the target gateway station to perform Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of the at least one terminal device to obtain a second measurement result;
receiving the second measurement result from the target gateway station and determining a channel quality of at least one terminal device under the first satellite based on the first measurement result and the second measurement result.
Optionally, the notification unit is further configured to:
and sending a first request message to the at least one terminal device through the first satellite, wherein the first request message is used for instructing the at least one terminal device to send the SRS.
Optionally, the notification unit is further configured to:
and sending the resource configuration information of the SRS of the at least one terminal device to the target gateway station through the first satellite.
Optionally, the first satellite simultaneously uses at least two antenna arrays and/or radio frequency channels to communicate with the source gateway station and the target gateway station, respectively.
In a sixth aspect, a terminal device is provided, which includes:
a receiving unit, configured to receive a first request message from a source gateway station through a first satellite, where the first request message is used to instruct the terminal device to transmit an SRS;
a sending unit, configured to send, by the first satellite, the SRS of the terminal device to the source gateway station and the target gateway station, so that the source gateway station notifies the target gateway station of switching the gateway station connection of the first satellite from the source gateway station to the target gateway station according to a measurement result of RRM measurement on the SRS of the terminal device, and notifies the terminal device of switching from the source gateway station to the target gateway station.
Optionally, the receiving unit is further configured to;
receiving, via the first satellite, SRS configuration information transmitted from the source gateway station.
Optionally, the first satellite simultaneously uses at least two antenna arrays and/or radio frequency channels to communicate with the source gateway station and the target gateway station, respectively.
In a seventh aspect, a computer-readable storage medium is provided, which stores computer instructions that, when executed on a computer, cause the computer to perform the method of any of the first or second aspects.
In the embodiment of the present application, if the source gateway station determines whether to switch the gateway station connection of the first satellite from the source gateway station to the target gateway station according to the channel quality of the terminal device under the first satellite, it may be considered that the source gateway station determines not to switch to the target gateway station when the channel quality of the terminal device is poor. And when the channel quality of the terminal equipment is better, the source gateway station determines to switch to the target gateway station so as to ensure that the terminal equipment switches when the communication quality of the network link is better, reduce the switching time delay and keep normal communication.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a satellite communication system provided in the prior art;
fig. 2 is a schematic diagram of feeder link connections in a satellite communication system provided by the prior art;
fig. 3 is a schematic flowchart of a handover method according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a communication device according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of another communication device provided in an embodiment of the present application;
fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present application;
fig. 7 is another schematic structural diagram of a terminal device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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.
Currently, the switching scheme of the feeder link is adopted in which the gateway station performs forced switching to the satellite at a predetermined time according to ephemeris information. However, in the actual operation process, since the satellite needs to be connected to different gateway stations, during the handover process, signal detection and confirmation are involved, however, both the signal detection and the signal confirmation require time, and in order to ensure that the terminal device keeps normal communication during the handover process, the terminal device under the satellite needs to be handed over, which results in a long handover delay and even causes network link interruption of the terminal device.
In view of this, the present application provides a handover method, in which instead of performing a forced handover of a satellite at a predetermined time, a source gateway station determines whether to handover a gateway station connection of a first satellite from a source gateway station to a target gateway station according to a channel quality of a terminal device under the first satellite. Then, it can be considered that when the channel quality of the terminal device is good, the source gateway station determines to switch to the target gateway station, so as to ensure the terminal device to switch when the communication quality of the network link is good, reduce the switching delay, and maintain normal communication.
In order to better understand the technical solutions of the present invention, the following detailed descriptions of the technical solutions of the present invention are provided with the accompanying drawings and the specific embodiments, and it should be understood that the specific features in the embodiments and the examples of the present invention are the detailed descriptions of the technical solutions of the present invention, and are not limitations of the technical solutions of the present invention, and the technical features in the embodiments and the examples of the present invention may be combined with each other without conflict.
An embodiment of the present application provides a handover method, please refer to fig. 3, which is a flowchart of the method. In the following description, the method is applied to the network architecture shown in fig. 2 as an example. In addition, the method may be performed by two communication devices, such as the gateway station and the terminal device in fig. 2. If the present embodiment is applied to the network architecture shown in fig. 2, the communication device described hereinafter may be the gateway station 1 or the gateway station 2 in the network architecture shown in fig. 2. Specifically, the flow of the handover method is described below.
Step S301, the source gateway station determines a channel quality of at least one terminal device connected to the first satellite.
In the embodiment of the application, before determining to switch the satellite, the source gateway station may determine the channel quality of at least one terminal device connected to the first satellite, so that the satellite is switched only when the channel quality of the at least one terminal device is good, thereby ensuring that the terminal device is switched when the communication quality of the network link is good, reducing the switching delay, and maintaining normal communication.
In general, the source gateway station may determine the satellite's motion trajectory from the ephemeris information and obtain information about the neighboring gateway stations to the source gateway station. When considering a handover of a first satellite and a terminal device connected to the first satellite at a certain time based on ephemeris information, a first request message may be sent to the first satellite before a possible handover time, the first request message being used to instruct at least one terminal device connected to the first satellite to report a respective Sounding Reference Signal (SRS) to a source gateway station. After receiving the first request message, the first satellite forwards the first request message to the at least one terminal device. After the at least one terminal device receives the first request, each terminal device forwards the SRS of the terminal device to the source gateway station through the first satellite.
After receiving the SRS of at least one terminal device, the source gateway station performs Radio Resource Management (RRM) measurement on the SRS of the at least one terminal device to obtain a measurement result. The measurement result may include a first measurement result, and the measurement result includes Reference Signal Receiving Power (RSRP) or Reference Signal Receiving Quality (RSRQ). For the sake of convenience of distinguishing from the measurement results hereinafter, the measurement result of the source gateway station performing RRM measurement on the SRS of at least one terminal device is referred to as a first measurement result herein.
Meanwhile, in order to determine the channel quality of the terminal device in advance when the terminal device is handed over to the target gateway station, the source gateway station may notify the target gateway station to perform RRM measurement on the SRS of at least one terminal device. In a possible embodiment, the source gateway station may send resource configuration information of the SRS of the at least one terminal device to the target gateway station to notify the target gateway station to perform RRM measurement on the SRS of the at least one terminal device. After the at least one terminal device receives the first request, each terminal device forwards the SRS of the terminal device to the target gateway station through the first satellite. After the target gateway station receives the resource configuration information of the SRS of the at least one terminal device, the target gateway station may perform RRM measurement on the SRS of the at least one terminal device to obtain a second measurement result.
It should be noted that the target gateway station is typically a gateway station adjacent to the source gateway station, and the satellite will connect to the gateway station at the next time. The resource allocation information of the SRS is sent to the source gateway station according to the first request message. In a possible implementation manner, the source gateway station may first send a first request message to the first satellite, and then send resource configuration information of the SRS of at least one terminal device to the target gateway station through the first satellite; alternatively, the source gateway station may transmit the resource configuration information of the SRS of the at least one terminal device to the target gateway station through the first satellite at the same time as transmitting the first request message to the first satellite.
After the target gateway station obtains the second measurement result, the second measurement result may be transmitted to the source gateway station. The source gateway station determines a channel quality of at least one terminal device under the first satellite based on the first measurement result and the second measurement result.
Step S302, the source gateway station notifies the target gateway station of the preparation for switching the feeder link of the first satellite according to the channel quality or according to the channel quality and the ephemeris information, and notifies the terminal device connected to the first satellite to switch from the source gateway station to the target gateway station.
After the source gateway station determines the channel quality of at least one terminal device under the first satellite, it may determine whether to handover the satellite based on the channel quality. Specifically, if the channel quality determined by the source gateway station is greater than the first threshold, the channel quality of the terminal device may be considered to be better, and the handover to the first satellite may be determined. Conversely, if the channel quality determined by the source gateway station is less than or equal to the first threshold, the channel quality of the terminal device may be considered poor, and it is determined that the first satellite is not to be handed over at this time in order to ensure the reliability of the handover.
In one possible implementation, if the source gateway station determines to hand off the first satellite, the source gateway station may notify a target gateway station connected to the first satellite to hand off the gateway station connection of the first satellite from the source gateway station to the target gateway station and notify a terminal device connected to the first satellite to hand off from the source gateway station to the target gateway station.
In particular, the source gateway station may send a handover request to a target gateway station connected to the first satellite, the handover request requesting the target gateway station to handover the first satellite. After receiving the handover request, the target gateway station starts handover preparation, and when the target gateway station is ready for handover, a handover request acknowledgement message may be sent to the source gateway station.
After receiving the handover request confirm message, the source gateway station may send a handover command to the terminal device under the first satellite to instruct the terminal device under the first satellite to handover from the source gateway station to the target gateway station. And after receiving the switching instruction, the terminal equipment under the first satellite switches the feeder link.
In the embodiment of the present application, the source gateway station switches the first satellite, that is, switches the feeder link of the first satellite, when it is determined that the channel quality of the terminal device is good. The method and the device avoid the situation that the network link of the terminal equipment cannot be ensured not to be interrupted if the channel quality of the terminal equipment is poor when the first satellite is switched at the preset moment. For example, the handover process involves detection and acknowledgement of a signal, which both require time, and if the channel quality of the terminal device is poor, the detection and acknowledgement of the signal take longer time, which results in a longer handover delay and even causes a network link interruption of the terminal device.
In an embodiment of the present application, the source gateway station may determine whether to switch the feeder link of the first satellite based on the SRS measurement. Of course, the source gateway station may combine the SRS measurement and ephemeris information to determine whether to switch the feeder link of the first satellite.
When the source gateway station determines that the channel quality of the terminal equipment is better based on the SRS measurement result, the source gateway station determines to switch the feeder link of the first satellite; conversely, if the source gateway station determines that the channel quality of the terminal device is poor based on the measurement result of the SRS, it determines not to switch the feeder link of the first satellite.
And when the source gateway station judges whether to switch the feeder link of the first satellite or not by combining the measurement result of the SRS and the ephemeris information, if the source gateway station determines that the channel quality of the terminal equipment is better based on the measurement result of the SRS, the source gateway station determines to switch the feeder link of the first satellite. If the source gateway station determines that the channel quality of the terminal device is poor based on the SRS measurement result, the source gateway station may perform a comprehensive decision based on the ephemeris information to determine whether to switch the feeder link of the first satellite. The source gateway station may perform a handoff of the feeder link of the first satellite after performing a comprehensive decision based on the ephemeris information.
In addition, in the embodiment of the present application, since the feeder link of the first satellite is switched according to the channel quality of the terminal device, the first satellite does not need to have only one communication link at the same time, that is, the first satellite communicates with the source gateway station and the target gateway station through more than one antenna array and/or radio frequency channel at the same time. That is, the first satellite may simultaneously communicate with the source and target gateway stations using at least two antenna arrays and/or radio frequency channels.
In a possible embodiment, the first satellite may communicate with a plurality of gateway stations in a Time Division Multiplexing (TDM) manner, a Frequency Division Multiplexing (FDM) manner, or a Space Division Multiplexing (SDM) manner.
The device provided by the embodiment of the application is described in the following with the accompanying drawings of the specification.
Referring to fig. 4, based on the same inventive concept, an embodiment of the present application further provides a communication device, which may be the source gateway station described above, and includes a memory 401, a processor 402, and a transceiver 403. The memory 401 and the transceiver 403 may be connected to the processor 402 through a bus interface (fig. 4 is taken as an example), or may be connected to the processor 402 through a dedicated connection line.
The memory 401 may be used to store programs, among other things. The processor 402 may be configured to read the program in the memory 401 and execute the following processes:
determining a channel quality of at least one terminal device connected to the first satellite;
informing a target gateway station adjacent to the source gateway station to perform switching preparation of a feeder link of the first satellite according to the channel quality or according to the channel quality and ephemeris information, and informing a terminal device connected with the first satellite to switch from the communication device to the target gateway station;
optionally, the processor 402 is specifically configured to:
performing Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of at least one terminal device to obtain a first measurement result;
informing a target gateway station to perform Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of at least one terminal device to obtain a second measurement result;
a second measurement result from the target gateway station is received and a channel quality of at least one terminal device under the first satellite is determined based on the first measurement result and the second measurement result.
Optionally, the transceiver 403 is specifically configured to:
and sending a first request message to at least one terminal device through the first satellite, wherein the first request message is used for instructing the at least one terminal device to send the SRS.
Optionally, the transceiver 403 is further configured to:
and transmitting the resource configuration information of the SRS of at least one terminal device to the target gateway station through the first satellite.
Optionally, the first satellite communicates with the communication device and the target gateway station using at least two antenna arrays and/or radio frequency channels simultaneously.
Where in fig. 4, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 402, and various circuits, represented by memory 401, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 403 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 402 is responsible for managing the bus architecture and general processing, and the memory 401 may store data used by the processor 402 in performing operations.
Alternatively, the Memory 401 may include a Read Only Memory (ROM), a Random Access Memory (RAM), and a disk Memory. The memory 401 is used for storing data required by the processor 402 during operation, that is, storing instructions executable by the at least one processor 402, and the at least one processor 402 executes the instructions stored in the memory 401 to perform the method provided by the embodiment of the present application. The number of the memories 401 is one or more. The memory 401 is also shown in fig. 4, but it should be noted that the memory 401 is not an optional functional block, and is therefore shown in fig. 4 by a dotted line.
Referring to fig. 5, based on the same inventive concept, an embodiment of the present application provides a communication device, which may be the source gateway station described above, and includes a determining unit 501 and a notifying unit 502. Wherein the determining unit 501 is configured to determine a channel quality of at least one terminal device connected to the first satellite. The notifying unit 502 is configured to notify a target gateway station adjacent to the source gateway station of preparation for switching the feeder link of the first satellite according to the channel quality or according to the channel quality and the ephemeris information, and notify a terminal device connected to the first satellite of switching from the communication device to the target gateway station.
Optionally, the determining unit 501 is specifically configured to:
performing Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of at least one terminal device to obtain a first measurement result;
informing a target gateway station to perform Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of at least one terminal device to obtain a second measurement result;
a second measurement result from the target gateway station is received and a channel quality of at least one terminal device under the first satellite is determined based on the first measurement result and the second measurement result.
Optionally, the notification unit 502 is further configured to:
and sending a first request message to at least one terminal device through the first satellite, wherein the first request message is used for instructing the at least one terminal device to send the SRS.
Optionally, the notification unit 502 is further configured to:
and transmitting the resource configuration information of the SRS of at least one terminal device to the target gateway station through the first satellite.
Optionally, the first satellite communicates with the source gateway station and the target gateway station using at least two antenna arrays and/or radio frequency channels simultaneously.
Therefore, for functions and the like that can be realized by each functional module of the device, reference may be made to the description of the embodiments shown in the present application, and details are not repeated. In addition, the determining unit 501 may be implemented by the processor 402 of fig. 4, and the notifying unit 502 may be implemented by the transceiver 403 of fig. 4.
Referring to fig. 6, based on the same inventive concept, an embodiment of the present application further provides a terminal device, which includes a memory 601, a processor 602, and a transceiver 603. The memory 601 and the transceiver 603 may be connected to the processor 602 through a bus interface (fig. 6 is taken as an example), or may be connected to the processor 602 through a dedicated connection line.
The memory 601 may be used to store programs, among other things. The processor 602 may be configured to read the program in the memory 601 and execute the following processes:
receiving a first request message from a source gateway station through a first satellite, wherein the first request message is used for indicating terminal equipment to send SRS;
the SRS of the terminal device is transmitted to the source gateway station and the target gateway station through the first satellite, so that the source gateway station informs the target gateway station of switching the gateway station connection of the first satellite from the source gateway station to the target gateway station according to the measurement result of RRM measurement on the SRS of the terminal device, and informs the terminal device of switching from the source gateway station to the target gateway station.
Optionally, the transceiver 403 is specifically configured to:
SRS configuration information transmitted from a source gateway station is received via a first satellite.
Optionally, the first satellite communicates with the source gateway station and the target gateway station using at least two antenna arrays and/or radio frequency channels simultaneously.
Wherein in fig. 6 the bus architecture may comprise any number of interconnected buses and bridges, with one or more processors, represented in particular by processor 602, and various circuits of memory, represented by memory 601, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 603 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 602 is responsible for managing the bus architecture and general processing, and the memory 601 may store data used by the processor 602 in performing operations.
Alternatively, the Memory 601 may include a Read Only Memory (ROM), a Random Access Memory (RAM), and a disk Memory. The memory 601 is used for storing data required by the processor 602 during operation, that is, storing instructions executable by the at least one processor 602, and the at least one processor 602 executes the method provided by the embodiment of the present application by executing the instructions stored in the memory 601. The number of the memory 601 is one or more. The memory 601 is also shown in fig. 6, but it should be noted that the memory 601 is not an optional functional module and is therefore shown in fig. 6 by a dotted line.
Referring to fig. 7, based on the same inventive concept, an embodiment of the present application provides a terminal device, which includes a receiving unit 701 and a transmitting unit 702, where the receiving unit 701 is configured to receive a first request message from a source gateway station through a first satellite, and the first request message is used to instruct the terminal device to transmit an SRS. The sending unit 702 is configured to send the SRS of the terminal device to the source gateway station and the target gateway station through the first satellite, so that the source gateway station informs the target gateway station of switching the gateway station connection of the first satellite from the source gateway station to the target gateway station according to a measurement result of performing RRM measurement on the SRS of the terminal device, and informs the terminal device of switching from the source gateway station to the target gateway station.
Optionally, the receiving unit 701 is further configured to;
SRS configuration information transmitted from a source gateway station is received via a first satellite.
Optionally, the first satellite communicates with the source gateway station and the target gateway station using at least two antenna arrays and/or radio frequency channels simultaneously.
Therefore, for functions and the like that can be realized by each functional module of the device, reference may be made to the description of the embodiments shown in the present application, and details are not repeated. In addition, the receiving unit 701 and the transmitting unit 702 may be implemented by the processor 602 and/or the transceiver 603 of fig. 6.
Based on the same inventive concept, embodiments of the present application provide a computer-readable storage medium, which stores computer instructions and when the computer instructions are executed on a computer, causes the computer to execute the method described in the embodiments of the present application.
The handover method provided in the embodiment of the present application may be applied to a satellite communication system, or other Orthogonal Frequency Division Multiplexing (OFDM) based systems, DFT-S-OFDM (DFT-Spread OFDM), Evolved Long Term Evolution (lte) based systems, new network device systems, and the like. In practical applications, the connections between the above devices may be wireless connections or wired connections.
It should be noted that the above-mentioned communication system may include a plurality of terminal devices, and the satellite and the gateway station may communicate (transmit signaling or transmit data) with the plurality of terminal devices. The terminal device referred to in the embodiments of the present application may refer to a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or other processing device connected to a wireless modem. Wireless user equipment, which may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, for example, portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, may communicate with one or more core networks via a Radio Access Network (RAN). Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. A Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), an Access Point (Access Point), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), a User Device (User Device), and a wireless Device (wireless Device).
The satellite provided by the embodiment of the application can be used as a base station at times. It should be understood that the terms first, second, etc. in the description of the embodiments of the present application are used for distinguishing between the descriptions and not for indicating or implying relative importance or order. In the description of the embodiments of the present application, "a plurality" means two or more.
In some possible embodiments, various aspects of the handover method provided by the present application may also be implemented in the form of a program product including program code for causing a computer device to perform the steps in the session management method according to various exemplary embodiments of the present application described above in this specification when the program product runs on the computer device, for example, the computer device may perform the session management method provided by the embodiments shown in the embodiments of the present application.
The program product of the handover method for a satellite communication system of the embodiments of the present application may employ a portable compact disc read only memory (CD-ROM) and include program code, and may be run on a computing device. However, the program product of the present application is not limited thereto, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
It should be noted that although several units or sub-units of the apparatus are mentioned in the above detailed description, such division is merely exemplary and not mandatory. Indeed, the features and functions of two or more units described above may be embodied in one unit, according to embodiments of the application. Conversely, the features and functions of one unit described above may be further divided into embodiments by a plurality of units.
Further, while the operations of the methods of the present application are depicted in the drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
The above embodiments are only used to describe the technical solutions of the present application in detail, but the above embodiments are only used to help understanding the method of the embodiments of the present application, and should not be construed as limiting the embodiments of the present application. Modifications and substitutions that may be readily apparent to those skilled in the art are intended to be included within the scope of the embodiments of the present application.
Claims (25)
1. A method of handover, comprising:
the source gateway station determining that a channel quality of at least one terminal device connected to the first satellite is greater than a first threshold;
and the source gateway station informs a target gateway station adjacent to the source gateway station of the preparation for switching the feeder link of the first satellite according to the channel quality or the channel quality and the ephemeris information, and informs at least one terminal device connected with the first satellite of switching from the source gateway station to the target gateway station.
2. The method of claim 1, wherein the source gateway station determining that a channel quality of at least one terminal device connected to the first satellite is greater than a first threshold value comprises:
the source gateway station performs Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of the at least one terminal device to obtain a first measurement result;
the source gateway station informs the target gateway station to perform Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of the at least one terminal device to obtain a second measurement result;
the source gateway station receives a second measurement from the target gateway station and determines, based on the first measurement and the second measurement, that a channel quality of at least one terminal device connected to the first satellite is greater than the first threshold.
3. The method of claim 2, wherein prior to the source gateway station making radio resource management, RRM, measurements on sounding reference signals, SRSs, of the at least one terminal device, further comprising:
and the source gateway station transmits a first request message to the at least one terminal device through the first satellite, wherein the first request message is used for indicating the at least one terminal device to transmit SRS.
4. The method of claim 2, wherein prior to said source gateway station receiving a second measurement from said target gateway station, further comprising:
and the source gateway station sends the SRS resource configuration information of the at least one terminal device to the target gateway station through the first satellite.
5. The method of any of claims 1-4, wherein the first satellite communicates with the source gateway station and the target gateway station using at least two antenna arrays and/or radio frequency channels simultaneously.
6. A method of handover, comprising:
the method comprises the steps that terminal equipment receives a first request message from a source gateway station through a first satellite, wherein the first request message is used for indicating the terminal equipment to send Sounding Reference Signals (SRS);
the terminal device sends the SRS of the terminal device to the source gateway station and the target gateway station through the first satellite, so that when a measurement result of radio resource management RRM measurement performed on the SRS of the terminal device is greater than a first threshold value, the source gateway station informs the target gateway station of switching the gateway station connection of the first satellite from the source gateway station to the target gateway station, and informs the terminal device of switching from the source gateway station to the target gateway station.
7. The handoff method of claim 6 wherein said terminal device receives a first request message from a source gateway station via a first satellite comprising;
and the terminal equipment receives SRS configuration information sent by the source gateway station through the first satellite.
8. The method of claim 6 or 7, wherein said first satellite communicates with said source gateway station and said target gateway station using at least two antenna arrays and/or radio frequency channels simultaneously.
9. A communication device, comprising:
a memory to store instructions;
a processor for reading the instructions in the memory, performing the following processes:
determining that a channel quality of at least one terminal device connected to a first satellite is greater than a first threshold;
notifying a target gateway station adjacent to the communication device to prepare for switching of a feeder link of the first satellite according to the channel quality or according to the channel quality and ephemeris information, and notifying at least one terminal device connected to the first satellite to switch from the communication device to the target gateway station;
a transceiver for transmitting information under the control of the processor.
10. The device of claim 9, wherein the processor is specifically configured to:
performing Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of the at least one terminal device to obtain a first measurement result;
informing the target gateway station to perform Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of the at least one terminal device to obtain a second measurement result;
receiving a second measurement result from the target gateway station and determining that a channel quality of at least one terminal device connected to the first satellite is greater than a first threshold based on the first measurement result and the second measurement result.
11. The device of claim 10, wherein the transceiver is specifically configured to:
and sending a first request message to the at least one terminal device through the first satellite, wherein the first request message is used for instructing the at least one terminal device to send the SRS.
12. The device of claim 10, wherein the transceiver is further to:
and sending the resource configuration information of the SRS of the at least one terminal device to the target gateway station through the first satellite.
13. The apparatus of any of claims 9-12, wherein said first satellite communicates with said communication device and said target gateway station using at least two antenna arrays and/or radio frequency channels simultaneously.
14. A terminal device, comprising:
a memory to store instructions;
a processor for reading the instructions in the memory, performing the following processes:
receiving a first request message from a source gateway station through a first satellite, wherein the first request message is used for instructing the terminal equipment to send a Sounding Reference Signal (SRS);
sending, by the first satellite, the SRS of the terminal device to the source gateway station and a target gateway station, so that the source gateway station notifies the target gateway station to switch the gateway station connection of the first satellite from the source gateway station to the target gateway station and notifies the terminal device to switch from the source gateway station to the target gateway station when a measurement result of performing RRM measurement on the SRS of the terminal device is greater than a first threshold;
a transceiver for transmitting information under the control of the processor.
15. The terminal device of claim 14, wherein the transceiver is specifically configured to:
receiving, via the first satellite, SRS configuration information transmitted from the source gateway station.
16. The apparatus of claim 14 or 15, wherein said first satellite communicates with said source gateway station and said target gateway station using at least two antenna arrays and/or radio frequency channels simultaneously.
17. A communication device, comprising:
a determining unit for determining that a channel quality of at least one terminal device connected to a first satellite is greater than a first threshold;
and a notifying unit, configured to notify, according to the channel quality or according to the channel quality and ephemeris information, a target gateway station adjacent to the communication device to prepare for switching a feeder link of the first satellite, and notify at least one terminal device connected to the first satellite to switch from the communication device to the target gateway station.
18. The device of claim 17, wherein the determining unit is specifically configured to:
performing Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of the at least one terminal device to obtain a first measurement result;
informing the target gateway station to perform Radio Resource Management (RRM) measurement on a Sounding Reference Signal (SRS) of the at least one terminal device to obtain a second measurement result;
receiving a second measurement result from the target gateway station and determining that a channel quality of at least one terminal device connected to the first satellite is greater than a first threshold based on the first measurement result and the second measurement result.
19. The device of claim 18, wherein the notification unit is further to:
and sending a first request message to the at least one terminal device through the first satellite, wherein the first request message is used for instructing the at least one terminal device to send the SRS.
20. The device of claim 18, wherein the notification unit is further to:
and sending the resource configuration information of the SRS of the at least one terminal device to the target gateway station through the first satellite.
21. The apparatus according to any of claims 17-20, wherein said first satellite communicates with said communication device and said target gateway station using at least two antenna arrays and/or radio frequency channels simultaneously.
22. A terminal device, comprising:
a receiving unit, configured to receive a first request message from a source gateway station through a first satellite, where the first request message is used to instruct the terminal device to transmit a sounding reference signal SRS;
a sending unit, configured to send, by the first satellite, the SRS of the terminal device to the source gateway station and the target gateway station, so that when a measurement result of RRM measurement on the SRS of the terminal device is greater than a first threshold, the source gateway station notifies the target gateway station to switch the gateway station connection of the first satellite from the source gateway station to the target gateway station, and notifies the terminal device to switch from the source gateway station to the target gateway station.
23. The apparatus of claim 22, wherein the receiving unit is further for;
receiving, via the first satellite, SRS configuration information transmitted from the source gateway station.
24. The apparatus of claim 22 or 23, wherein said first satellite communicates with said source gateway station and said target gateway station using at least two antenna arrays and/or radio frequency channels simultaneously.
25. A computer-readable storage medium having stored thereon computer instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-5 or 6-8.
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| CN113365315B (en) * | 2020-03-03 | 2023-06-06 | 华为技术有限公司 | Gateway station switching method and device |
| CN114614874A (en) * | 2020-11-24 | 2022-06-10 | 中国移动通信有限公司研究院 | Satellite switching method and device |
| CN112671448A (en) * | 2020-12-09 | 2021-04-16 | 中国电子科技集团公司第五十四研究所 | Cross-satellite switching method for feeder link in low-earth-orbit satellite mobile communication system |
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