CN112968725B - Satellite link switching method and device - Google Patents
Satellite link switching method and device Download PDFInfo
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- CN112968725B CN112968725B CN201911283907.2A CN201911283907A CN112968725B CN 112968725 B CN112968725 B CN 112968725B CN 201911283907 A CN201911283907 A CN 201911283907A CN 112968725 B CN112968725 B CN 112968725B
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Abstract
The embodiment of the invention provides a satellite link switching method and device. The method comprises the following steps: acquiring the time range of each link allowed to be adjusted in the system period; determining a time slot corresponding to each link according to each time slot included in the system period and the time range of each link in the system period, which is allowed to be adjusted; and respectively transmitting the slot number of the time slot corresponding to each link to the satellite on each link so that each link performs link switching at the starting time of the corresponding time slot. The satellite link switching method and the satellite link switching device provided by the embodiment of the invention can adjust the asynchronous satellite link switching to the starting time of the same time slot, so that the link switching in the time slot can be completed within the time of one time slot, the unreliable time of a network can be reduced, the availability of the network is improved, and the cost required by route updating can be reduced.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for switching a satellite link.
Background
In recent years, the development of satellite networks is accelerated by the maturity of satellite communication technology, and the integration of the satellite network and the ground network into an integrated network is gradually the main trend of network evolution in the future. Unlike conventional terrestrial networks, a significant feature of satellite networks is a highly dynamic topology, which has a significant impact on routing.
Currently, it is becoming increasingly common in the industry to apply IP technology to facilitate convergence of satellite networks and terrestrial networks. In a satellite network, links are constantly disconnected from reconnection as the satellite moves around the earth, i.e., link switching. In a traditional satellite network, satellite link switching mainly depends on quantitative indexes such as signal strength, and the like, and the link switching directly causes network topology change, so that the routing of the satellite network must be recalculated. In the process of link switching, old routing information in the router is not effective, new routing information is not calculated yet, forwarding of data packets is possible to be wrong, routing frequency is heavy to calculate due to unordered link switching, routing stability is reduced sharply, and network availability is poor. In such a state, the network is generally considered to be unable to provide reliable services.
During the link switching process, the reliability of the network can be improved through the route updating. With the expansion of network size, the number of route updates will increase explosively, and the network will still be in an unreliable state. With the increasing demand for the satellite network access capability, how to improve the network availability under the future foreseeable large-scale link switching scenario is an urgent problem to be solved.
Disclosure of Invention
The embodiment of the invention provides a satellite link switching method and a satellite link switching device, which are used for solving or at least partially solving the defect of poor network availability in the prior art.
In a first aspect, an embodiment of the present invention provides a method for switching a satellite link, including:
acquiring a time range allowing adjustment of switching of each link in a system period;
determining a time slot corresponding to each link according to each time slot included in the system period and a time range allowing adjustment of switching of each link in the system period;
and respectively transmitting the slot number of the corresponding time slot to the satellite on each link, so that each link performs link switching at the starting time of the corresponding time slot.
Preferably, the determining, according to the time slots included in the system cycle and the time range of the link switching allowable adjustment in the system cycle, before the time slot corresponding to each link, further includes:
acquiring the switching duration of each link;
and determining the time length of the time slot according to the switching time length of each link.
Preferably, the specific step of determining the time duration of the time slot according to the switching time duration of each link includes:
and determining the maximum time length in the switching time lengths of all the links as the time length of the time slot.
Preferably, the specific step of acquiring the switching duration of each link includes:
and for any link, acquiring the switching duration of the link according to the switching mode of the link.
Preferably, the specific step of obtaining the switching duration of the link according to the switching manner of the link includes:
acquiring the physical adjustment duration of the link according to the switching mode of the link, and acquiring the route updating duration of the link;
and acquiring the switching time length of the link according to the physical adjustment time length of the link and the route updating time length of the link.
Preferably, the specific step of determining, according to each time slot included in the system cycle and a time range within which adjustment of switching of each link in the system cycle is allowed, a time slot corresponding to each link includes:
for each link, acquiring a plurality of time slots with the starting time within the time range of the link switching allowed adjustment as candidate time slots of the link;
and determining one of the candidate time slots of the link as the time slot corresponding to the link so as to minimize the total number of the time slots corresponding to each link.
Preferably, for each of the links, the acquiring a plurality of time slots whose starting time falls within the time range of the link switching allowance adjustment, and the specific step of taking the time slots as the candidate time slots of the link further includes:
if the switching mode of the link is judged and known to be link conversion, dividing the time range of the link switching allowance adjustment into a first sub-time range and a second sub-time range; the starting time of the second sub-time range is not earlier than the ending time of the first sub-time range;
and taking a plurality of time slots with the starting time falling in the first sub-time range as a first candidate time slot of the link, and taking a plurality of time slots with the starting time falling in the second sub-time range as a second candidate time slot of the link.
In a second aspect, an embodiment of the present invention provides a satellite link switching apparatus, including:
the calculation module is used for acquiring the time range of each link switching allowable adjustment in the system period;
an adjusting module, configured to determine, according to each time slot included in the system period and a time range within which adjustment is allowed for switching of each link in the system period, a time slot corresponding to each link;
and the sending module is used for respectively sending the slot number of the corresponding time slot to the satellite on each link so as to enable each link to carry out link switching at the starting moment of the corresponding time slot.
In a third aspect, an embodiment of the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the computer program is executed, the steps of the satellite link switching method provided in any one of the various possible implementations of the first aspect are implemented.
In a fourth aspect, an embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the satellite link switching method as provided in any one of the various possible implementations of the first aspect.
According to the satellite link switching method and device provided by the embodiment of the invention, the time slot corresponding to each link is determined according to each time slot included in the system period and the time range allowed to be adjusted by each link in the system period, the asynchronous satellite link switching can be adjusted to the starting time of the same time slot, the link switching in the time slot can be completed within the time of one time slot, the unreliable time of a network can be reduced, the availability of the network is improved, and the overhead required by route updating can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a satellite link switching method according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating various handover modes in a satellite link handover method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a satellite link switching apparatus according to an embodiment of the present invention;
fig. 4 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to overcome the above problems in the prior art, embodiments of the present invention provide a method and an apparatus for switching a satellite link, where the inventive concept is to convert an original out-of-order satellite switching into a time slot-based synchronous link switching, thereby greatly reducing network unreliable time and improving network availability and reliability.
Fig. 1 is a flowchart illustrating a satellite link switching method according to an embodiment of the present invention. As shown in fig. 1, the method includes: and step S101, acquiring the time range of each link allowed to be adjusted in the system period.
It should be noted that the main execution body of the satellite link switching method provided by the embodiment of the present invention is a satellite link switching device. The satellite link switching device is arranged on the ground and used for controlling the link switching of each satellite.
Specifically, parameters of each satellite in a system cycle, such as signal strength at each time in the system cycle, a distance from a satellite link switching device, and the like, may be acquired according to a trajectory of each satellite in the system cycle.
The system period refers to that the relative position of each target returns to the initial time after a certain time by a common system consisting of a satellite constellation and the ground.
The Satellite Tool Kit (STK) can be used to obtain the trajectory of each Satellite in a system cycle, and parameters such as the signal strength of each Satellite in the system cycle, the distance between each Satellite and the Satellite link switching device, and the like.
The switching time of each link and the time range allowing adjustment can be determined by a common satellite link switching method according to the signal strength of each satellite or the distance between each satellite and the satellite link switching device in the system period.
The general satellite link switching method does not distinguish the specific mode of link switching. Fig. 2 is a schematic diagram illustrating various handover modes in a satellite link handover method according to an embodiment of the present invention. As shown in fig. 2, in the embodiment of the present invention, the link switching specifically includes three switching manners: creating links, cutting links, and transforming links.
Creating a link means establishing a new link. E.g. at t1And performing link switching in a link establishing mode at the moment.
And the link is cut off, namely the current link is cut off. E.g. at t4And performing link switching in a link establishing mode at the moment.
And switching the link, namely disconnecting the current link and establishing a new link. E.g. at t2And performing link switching in a link establishing mode at the moment. The link switching method may be a switching method in which a link is first disconnected and then a link is created.
For the handoff mode that creates a link, the time frame that allows adjustment means that the signal strength in the time frame is sufficient to support link establishment.
For the switching mode of cutting off the link, the time range allowed to be adjusted refers to the time period of the link, and the starting end of the time range is not earlier than the link establishment time.
For the switching mode of the transformed link, since it can be considered that the link is cut off first and then the link is created, the time range allowed to be adjusted may include two sub-time ranges: the first sub-time range is a sub-time range which is allowed to be adjusted when the link is cut off, and refers to a time period in which the link exists, and the starting end of the sub-time range is not earlier than the link establishment time; another time range is a sub-range of time that is allowed to be adjusted for creating a link, and the signal strength in this time range is sufficient to support link establishment.
It should be noted that there is a constraint condition for the link switching manner, that is, there is a surplus for the link newly established by the satellite to satisfy the number of available antennas. For example, if a satellite has only one antenna connected to the ground, the start of the sub-time range for which the creation of the link is allowed to be adjusted in the link-switched mode must not be earlier than the actual moment of disconnection of the link.
In a general satellite link switching method, the switching time determined in the above steps is directly used as the actual switching time. In the embodiment of the invention, the switching time determined by the steps is directly used as the original switching time, and the subsequent steps are used for determining the new time as the actual switching time according to the original switching time.
Step S102, determining the time slot corresponding to each link according to each time slot included in the system period and the time range of each link allowed to be adjusted in the system period.
It should be noted that the system cycle is divided into a plurality of continuous equal-length parts at the network layer, and each part is a time slot.
For each link, a time within the time range of the link switching allowance adjustment in the system cycle corresponds to the original switching time of the link, which is used as the actual switching time of the link, that is, the switching time of the link is adjusted, and the original switching time acquired in step S101 is adjusted to the actual switching time determined in step S102.
A time within the time range in which the link switching is allowed to be adjusted is a start time of a certain time slot, and the time slot is a time slot corresponding to the link.
It is understood that the start time of a time slot is also the end time of the time slot immediately preceding the time slot.
Step S103, respectively sending the slot number of the time slot corresponding to each link to the satellite on each link, so that each link performs link switching at the start time of the corresponding time slot.
Specifically, for each link, the slot number of the time slot corresponding to the link is sent to the satellite on the link.
The start time of the time slot can be determined from the slot number of the corresponding time slot.
And if each satellite on the link judges and knows that the current time is the actual switching time of the link, namely the current time is the starting time of the corresponding time slot, performing corresponding link switching operation to realize link switching.
By adjusting the switching time, the switching time of each link can be concentrated to a plurality of fixed times (namely the starting times of a plurality of time slots) from a plurality of unordered times, the unsynchronized satellite link switching can be adjusted to the starting time of the same time slot, the link switching in the time slot can be completed within the time of one slot, the original unordered satellite switching is converted into the synchronous link switching based on the time slot, the network unreliable time is greatly reduced, and the availability and the reliability of the network are improved.
Through the division of the time slots, the reliable time periods and the unreliable time periods of the network can be obviously defined according to the time slots, and the whole operation of the network is highly ordered. And with the increase of the network scale, the route updating times are increased more slowly, the updating times are greatly reduced, the requirement on resources is greatly reduced, and the improvement on the network performance is more obvious.
It should be noted that, after step S103, the method may further include: judging whether the satellite constellation changes, such as newly added satellites, existing satellites have faults or failed satellites return to normal and the like; if the change occurs, step S101 is executed according to the changed satellite constellation, and the time slot and the actual switching time corresponding to each link are determined again.
The embodiment of the invention determines the starting time of the time slot corresponding to each link according to each time slot included in the system period and the time range of each link allowed to be adjusted in the system period, and the starting time is used as the actual switching time of the link, so that the asynchronous satellite link can be switched and adjusted to the starting time of the same time slot, the link switching in the time slot can be completed within the time of one time slot, the unreliable time of a network can be reduced, the availability of the network is improved, and the overhead required by route updating can be reduced.
Based on the content of the foregoing embodiments, determining, according to the time slots included in the system period and the time range allowed to be adjusted by each link in the system period, a time slot corresponding to each link, further includes: and acquiring the switching duration of each link.
Specifically, before step S102, for each link, the time required for switching the link is obtained as the switching time duration of the link, so as to count the switching time duration of each satellite link in one system period.
And determining the time length of the time slot according to the switching time length of each link.
It should be noted that the duration of the time slot is related to the composition of the network. When different satellite constellations are fused with a ground network, the switching time length of the satellite link is different. Too short time slot duration can cause the satellite link switching to be unable to be accomplished in a time slot, and too long time slot duration can cause a large amount of resource waste.
Therefore, an appropriate time duration can be determined as the time duration of the time slot according to the switching time duration of each link.
And according to the duration of the time slot, the system period is divided into a plurality of continuous fixed-length time slots.
The satellite link is switched synchronously at the start time of a certain time slot and is finished before the end time. Through adjustment, the network can accurately know which time slot routing information is invalid, can carry out targeted optimization, and can provide reliable service for users at which moments. Due to the existence of the regression period, the satellite only needs to carry the information of the time slot number in one period, and a large amount of memory cannot be occupied.
According to the embodiment of the invention, the switching duration of each link is obtained, and the duration of the time slot is determined according to the switching duration of each link, so that the satellite link switching can be ensured to be completed in one time slot, the network availability is improved, and a large amount of resource waste is avoided.
Based on the content of the foregoing embodiments, the specific step of determining the time duration of the time slot according to the switching time duration of each link includes: and determining the maximum time length in the switching time lengths of all the links as the time length of the time slot.
Specifically, the maximum time length in the switching time lengths of the links can be selected as the time length of the time slot, so that the satellite link switching can be stably ensured to be completed in one time slot, and under the condition that the scene is not changed, the network scale is basically unchanged, and the time length difference of different satellite link switching is very small, so that the resource waste is very small, but the network availability is improved.
The embodiment of the invention can improve the availability of the network and can not cause a great deal of waste of resources by determining the maximum time length in the switching time lengths of all the links as the time length of the time slot.
Based on the content of the foregoing embodiments, the specific step of obtaining the switching duration of each link includes: and for any link, acquiring the switching duration of the link according to the switching mode of the link.
It should be noted that the three link switching manners have different specific steps, and therefore, for any link, the switching duration of the link needs to be obtained according to the method corresponding to the switching manner of the link.
According to the embodiment of the invention, the switching time length of the link is obtained according to the switching mode of the link, and the accurate switching time length of each link can be obtained, so that the more appropriate time slot time length can be determined, the satellite link switching can be ensured to be completed in one time slot, the network availability is improved, and a large amount of resource waste can not be caused.
The specific step of obtaining the link switching duration according to the link switching mode includes: acquiring the physical adjustment duration of a link according to the switching mode of the link, and acquiring the route updating duration of the link; and acquiring the switching time of the link according to the physical adjustment time of the link and the route updating time of the link.
Specifically, link switching, including physical adjustment and route update procedures.
The physical adjustment process includes the processes of adjusting the antenna and selecting the target.
The route updating process comprises the processes of fault detection, flooding, minimum spanning tree calculation, topology information generation, route information table updating, path forwarding table writing, line card writing and the like.
The time required for the link to be switched refers to the total time consumed by the physical adjustment process and the route updating process in the link switching.
The time required for the physical adjustment process of creating, cutting and converting links is Cr, Dr and Cr + Sw + Dr, respectively. Cr, Dr, and Sw refer to the time required for a physical adjustment procedure between establishing a new link, disconnecting the current link, and establishing a new link, respectively.
The time required for the route updating process includes time D required for fault detection, time O required for topology information generation, time F required for flooding, time SPT required for calculation of a minimum spanning tree, time RIB required for updating a route information table and a path forwarding table, and time DD required for writing to a line card.
Switching time T of three modes of creating link, cutting link and converting linkCr、TDrAnd TSwCan be obtained by the following formula calculation respectively:
generally, routers regularly detect whether the network structure has changed, so that only failures detected after the physical adjustment process is completed are correct.
According to the embodiment of the invention, the switching time length of the link is obtained according to the switching mode of the link, and the accurate switching time length of each link can be obtained, so that the more appropriate time slot time length can be determined, the satellite link switching can be ensured to be completed in one time slot, the network availability is improved, and a large amount of resource waste can not be caused.
Based on the content of the foregoing embodiments, the specific step of determining the time slot corresponding to each link according to the time slots included in the system period and the time range allowed to be adjusted by each link in the system period includes: for each link, acquiring a plurality of time slots with the starting time falling within the time range of link switching allowed adjustment as candidate time slots of the link.
Specifically, for each link, it can be known how many starting times of time slots exist within the time range of the link switching permission adjustment, and the time slots can be used as candidate time slots of the link.
For example, the system cycle is 0 to 60 seconds, for link 1, the original switching time of the link acquired through step S101 is 13 seconds, the time range allowing adjustment is 1 to 13 seconds, the duration of the time slot is 5 seconds, the system cycle is divided into 12 time slots, which are 1 to 12 time slots in turn, and the candidate time slot of link 1 may be 2 nd and 3 rd time slots, that is, the start times (5 th and 10 th seconds) of the 2 nd and 3 rd time slots may be the candidate switching time of link 1.
And determining one of the candidate time slots of the link as an actual time slot corresponding to the link so as to minimize the total number of the time slots corresponding to each link.
Specifically, since there may be a plurality of candidate time slots of a link, one of a plurality of candidate time slots of each link may be selected as the time slot corresponding to the link through a reasonable allocation algorithm, so that the total number of time slots corresponding to each link is minimized, and the switching of each link is allocated to fewer time slots as much as possible.
For example, the system period is 0 to 60 seconds, the duration of the time slot is 5 seconds, the system period is divided into 12 time slots, which are sequentially the 1 st to 12 th time slots, the candidate time slot of link 1 is the 2 nd and 3 rd time slots, the candidate time slot of link 2 is the 1 st and 2 nd time slot, and the candidate time slot of link 3 is the 2 nd to 4 th time slots, then the 2 nd time slot may be determined as the time slot corresponding to links 1 to 3, so that the time slot corresponding to links 1 to 3 has only one time slot, i.e., the 2 nd time slot.
According to the embodiment of the invention, one of the candidate time slots of the link is determined to be used as the actual switching time of the time slot corresponding to the link, so that the total number of the time slots corresponding to each link is minimum, the time of the unreliable state of the network can be reduced, and the availability and the reliability of the network can be improved.
Based on the content of the foregoing embodiments, for each link, acquiring a plurality of time slots whose starting time falls within a time range of link switching allowance adjustment, and the specific step of taking the time slots as the candidate time slots of the link includes: and if the judgment shows that the switching mode of the link is to create the link, taking the starting time of a plurality of time slots within the time range of the adjustment permission of the link switching as the candidate time slot of the link.
Specifically, for a link whose switching method is the create link method, a time slot whose starting time is before or after the original switching time of the link, for example, a time slot in which the original switching time of the link is located, within the time range in which the link switching is allowed to be adjusted, may be used as the candidate time slot of the link.
The embodiment of the invention can ensure that the establishment of the link is completed in one time slot by taking the starting time of a plurality of time slots after the original switching time of the link in the time range of the adjustment permission of the link switching as the candidate switching time of the link in the link creating mode, thereby reducing the time length of the unreliable state of the network and improving the availability and the reliability of the network.
Based on the content of the foregoing embodiments, for each link, acquiring a plurality of time slots whose starting time falls within the time range of link switching permission adjustment, and using the time slots as candidate time slots of the link further includes: and if the judgment shows that the link switching mode is the link disconnection, taking a plurality of time slots within the time range of the link switching permission adjustment as the candidate time slots of the link.
Specifically, for a link whose switching method is the link disconnection method, a plurality of time slots whose start time is before or after the original switching time of the link, for example, a time slot in which the original switching time of the link is located, within the time range in which the link switching is permitted to be adjusted, may be used as the candidate time slots of the link.
The embodiment of the invention can ensure that the disconnection of the link is finished in one time slot by taking the starting time of a plurality of time slots before the original switching time of the link in the time range of the adjustment permission of the link switching as the candidate switching time of the link in the link disconnection mode, thereby reducing the time length of the unreliable state of the network and improving the availability and the reliability of the network.
Based on the content of the foregoing embodiments, for each link, acquiring a number of time slots whose starting time falls within a time range of link switching allowance adjustment, and the specific step of using the time slots as the candidate time slots of the link further includes: if the switching mode of the link is judged and known to be link conversion, dividing the time range of the link switching allowed adjustment into a first sub-time range and a second sub-time range; the start time of the second sub-time range is no earlier than the end time of the first sub-time range.
Specifically, the link switching may be regarded as a combination of a link disconnection method and a link creation method. Accordingly, the time range of link switch allowance adjustment may be divided into a first sub-time range and a second sub-time range.
The first sub-time range corresponds to a link-down portion of the transformed link scheme and the second sub-time range corresponds to a link-up portion of the transformed link scheme, such that the start of the second sub-time range is no earlier than the end of the first sub-time range
And taking a plurality of time slots with the starting time falling in the first sub-time range as a first candidate time slot of the link, and taking a plurality of time slots with the starting time falling in the second sub-time range as a second candidate time slot of the link.
Specifically, a plurality of time slots with the start time before or after the original switching time of the link, for example, the time slot in which the original switching time of the link is located, in the first sub-time range, may be used as the first candidate time slot of the link.
A number of time slots with a start time before or after the original switching time of the link, for example, the time slot in which the original switching time of the link is located, within the second sub-time range, may be used as the second candidate time slot of the link.
For the link switching mode, the specific steps of determining the first candidate time slot are similar to the specific steps of determining the candidate time slot by cutting off the link mode, and are not repeated here; the specific steps for determining the second candidate time slot are similar to the specific steps for determining the candidate time slot in the link creating manner, and are not described herein again.
For each satellite link, the candidate time slot of the link whose switching method is the link creation method and the link disconnection method may be determined first, and after the candidate time slot of the link whose switching method is the link creation method and the link disconnection method is determined, the candidate time slot of the link whose switching method is the link change method may be determined.
In the embodiment of the invention, the starting time of a plurality of time slots before the original switching time of the link in the time range of the adjustment permission of the link switching is used as the first candidate switching time of the link, and the starting time of a plurality of time slots after the original switching time of the link is used as the second candidate switching time of the link, so that the disconnection of the current link and the establishment of a new link can be ensured to be finished in one time slot in the switching process of the link, thereby reducing the time length of the unreliable state of the network and improving the availability and the reliability of the network.
Fig. 3 is a schematic structural diagram of a satellite link switching apparatus according to an embodiment of the present invention. Based on the content of the foregoing embodiments, as shown in fig. 3, the apparatus includes a calculating module 301, an adjusting module 302, and a sending module 303, where:
a calculating module 301, configured to obtain a time range allowed to be adjusted for each link in a system period;
an adjusting module 302, configured to determine a time slot corresponding to each link according to each time slot included in a system period and a time range allowed to be adjusted by each link in the system period;
a sending module 303, configured to send the slot number of the time slot corresponding to each link to the satellite on each link, so that each link performs link switching at the start time of the corresponding time slot.
Specifically, the calculation module 301, the adjustment module 302, and the transmission module 303 are electrically connected in sequence.
The calculation module 301 may determine the switching time and the allowable adjustment time range of each link according to parameters such as the signal strength of each satellite or the distance from the satellite link switching device in the system cycle by using a common satellite link switching method.
For each link, the adjusting module 302 corresponds a time slot within a time range of the link switching adjustment allowance in the system period to the link, and a starting time of the time slot is used as an actual switching time of the link.
For each link, the transmitting module 303 transmits the slot number of the time slot corresponding to the link to the satellite on the link.
And if each satellite on the link judges and knows that the current time is the actual switching time of the link, namely the current time is the starting time of the corresponding time slot, performing corresponding link switching operation to realize link switching.
The specific method and process for implementing the corresponding function by each module included in the satellite link switching device are described in the embodiments of the satellite link switching method, and details are not described herein.
The satellite link switching device is used for the satellite link switching method of the foregoing embodiments. Therefore, the description and definition in the satellite link switching method in the foregoing embodiments can be used for understanding the execution modules in the embodiments of the present invention.
According to the time slots included in the system period and the time range allowed to be adjusted by each link in the system period, the time slot corresponding to each link is determined, asynchronous satellite link switching can be adjusted to the starting time of the same time slot, the link switching in the time slot can be completed within the time of one slot, the unreliable time of a network can be reduced, the availability of the network is improved, and the cost required by route updating can be reduced.
Fig. 4 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention. Based on the content of the above embodiment, as shown in fig. 4, the electronic device may include: a processor (processor)401, a memory (memory)402, and a bus 403; wherein, the processor 401 and the memory 402 complete the communication with each other through the bus 403; processor 401 is configured to invoke computer program instructions stored in memory 402 and executable on processor 401 to perform the satellite link handoff methods provided by the various method embodiments described above, including, for example: acquiring the time range of each link allowed to be adjusted in the system period; determining a time slot corresponding to each link according to each time slot included in the system period and the time range of each link in the system period, which is allowed to be adjusted; and respectively transmitting the slot number of the corresponding time slot to the satellite on each link, so that each link carries out link switching at the starting time of the corresponding time slot.
Another embodiment of the present invention discloses a computer program product, the computer program product includes a computer program stored on a non-transitory computer readable storage medium, the computer program includes program instructions, when the program instructions are executed by a computer, the computer can execute the satellite link switching method provided by the above-mentioned method embodiments, for example, the method includes: acquiring the time range of each link allowed to be adjusted in the system period; determining a time slot corresponding to each link according to each time slot included in the system period and the time range of each link in the system period, which is allowed to be adjusted; and respectively transmitting the slot number of the corresponding time slot to the satellite on each link, so that each link carries out link switching at the starting time of the corresponding time slot.
Furthermore, the logic instructions in the memory 402 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or make a contribution to the prior art, or may be implemented 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 methods of the embodiments of the present invention. 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.
Another embodiment of the present invention provides a non-transitory computer-readable storage medium, which stores computer instructions, where the computer instructions cause a computer to execute the satellite link handover method provided in the foregoing method embodiments, for example, the method includes: acquiring the time range of each link allowed to be adjusted in the system period; determining a time slot corresponding to each link according to each time slot included in the system period and the time range of each link in the system period, which is allowed to be adjusted; and respectively transmitting the slot number of the corresponding time slot to the satellite on each link, so that each link carries out link switching at the starting time of the corresponding time slot.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. It is understood that the above-described technical solutions may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method of the above-described embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A method for switching a satellite link, comprising:
acquiring the time range of each link allowed to be adjusted in the system period;
determining a time slot corresponding to each link according to each time slot included in the system period and a time range allowed to be adjusted by each link in the system period; all the time slots are equal in length;
respectively sending the slot number of the corresponding time slot to a satellite on each link, so that each link performs link switching at the starting time of the corresponding time slot;
before determining the time slot corresponding to each link according to the time slots included in the system cycle and the time range allowed to be adjusted by each link in the system cycle, the method further includes:
acquiring the switching duration of each link;
determining the time length of the time slot according to the switching time length of each link;
the specific step of determining the time slot duration according to the switching duration of each link includes:
determining the maximum time length in the switching time lengths of all the links as the time length of the time slot;
the specific step of determining, according to each time slot included in the system period and a time range allowed to be adjusted by each link in the system period, a time slot corresponding to each link includes:
for each link, acquiring a plurality of time slots with the starting time within the time range of the link switching allowed adjustment as candidate time slots of the link;
and determining one of the candidate time slots of the link as the time slot corresponding to the link so as to minimize the total number of the time slots corresponding to each link.
2. The method according to claim 1, wherein the step of obtaining the handover duration of each link comprises:
and for any link, acquiring the switching duration of the link according to the switching mode of the link.
3. The method of claim 2, wherein the step of obtaining the link switching duration according to the link switching manner comprises:
acquiring the physical adjustment duration of the link according to the switching mode of the link, and acquiring the route updating duration of the link;
and acquiring the switching time length of the link according to the physical adjustment time length of the link and the route updating time length of the link.
4. The method according to claim 1, wherein the step of acquiring, for each of the links, time slots whose starting time falls within the time range of the link switching adjustment allowance, and the step of selecting the time slots as the candidate time slots of the link further comprises:
if the switching mode of the link is judged and known to be link conversion, dividing the time range of the link switching allowance adjustment into a first sub-time range and a second sub-time range; the starting time of the second sub-time range is not earlier than the ending time of the first sub-time range;
and taking a plurality of time slots with the starting time falling in the first sub-time range as a first candidate time slot of the link, and taking a plurality of time slots with the starting time falling in the second sub-time range as a second candidate time slot of the link.
5. A satellite link switching apparatus, comprising:
the calculation module is used for acquiring the time range of each link allowed to be adjusted in the system period;
the adjusting module is used for determining a time slot corresponding to each link according to each time slot included in the system period and a time range allowing adjustment of each link in the system period; all the time slots are equal in length;
a sending module, configured to send the slot number of the corresponding time slot to a satellite on each link, so that each link performs link switching at a start time of the corresponding time slot;
the adjusting module is further configured to obtain a switching duration of each link; determining the time length of the time slot according to the switching time length of each link;
the adjusting module is specifically configured to determine a maximum duration of the switching durations of the links as a duration of the time slot;
the adjusting module is specifically configured to acquire, for each link, a plurality of time slots whose starting time falls within a time range in which adjustment is allowed for the link switching, as candidate time slots of the link; and determining one of the candidate time slots of the link as the time slot corresponding to the link so as to minimize the total number of the time slots corresponding to each link.
6. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the satellite link switching method according to any of claims 1 to 4 are implemented when the program is executed by the processor.
7. A non-transitory computer readable storage medium, having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the satellite link switching method according to any one of claims 1 to 4.
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