CN115913323A - Low-orbit access selection method based on space-time grid and storage medium - Google Patents
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Abstract
A low-orbit access selection method and a storage medium based on a space-time grid comprise the following steps: establishing a low-orbit satellite network multi-scale grid and a grid attribute matrix; after the service initiates an access application, extracting service application carrying information; for deterministic service, selecting a satellite with the most idle channels for access, and if no idle channel exists, selecting an occupied channel to preempt access; updating the space-time grid attribute matrix after access; for the non-deterministic service, selecting a satellite with the most idle channels for accessing, updating the space-time grid attribute matrix after accessing, if no idle channel exists, storing the service application into a corresponding cache queue, and waiting for the idle channel; and if the service application waiting time in the queue exceeds a threshold value, rejecting the service access. According to the method, the multi-scale space-time grid is established through geographic longitude and latitude and time slice division according to the ground coverage area and the operation cycle of the low-orbit satellite network, multi-granularity division of services and access resources on the space-time dimension is realized, and differentiated service requirements are quickly matched with the access resources.
Description
Technical Field
The invention relates to a low-orbit access selection method and a storage medium based on a space-time grid, belonging to the data communication transmission technology.
Background
At present, low-orbit access research aiming at multi-service requirements mainly comprises two types: one is a user side angle, attributes such as the earth residual service time, the satellite elevation angle, the longest coverage time and the like of all possibly connected satellites are comprehensively evaluated according to the terminal geographical position of an arriving service access request, and the complex multi-attribute decision problem is usually solved by an intelligent algorithm; the other is the angle of the satellite network side, a service arrival model in the coverage range of the low earth orbit satellite network is established, and the service prediction result in the coverage range is utilized to complete the access resource allocation of the satellite side. The method has the advantages of large model size, complex calculation and high performance requirement on a calculation platform, the ground terminal is taken as the fixed terminal, the bidirectional mobility of the satellite and the high-speed terminal is less considered, the terminal is difficult to directly acquire the information of the accessible satellite and consider the service differentiation service requirement, and particularly the service quality requirement of the definite boundary of the deterministic service is difficult to meet.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method overcomes the defects of the prior art, solves the high efficiency of resource matching and ensures the service quality.
The purpose of the invention is realized by the following technical scheme:
a low-orbit access selection method based on a space-time grid comprises the following steps:
establishing a multi-scale grid and a grid attribute matrix of a low earth orbit satellite network;
after the service initiates an access application, extracting service application carrying information;
for deterministic service, selecting a satellite with the most idle channels for access, and if no idle channel exists, selecting occupied channels to preempt access; updating the space-time grid attribute matrix after access;
for the non-deterministic service, selecting a satellite with the most idle channels for access, updating a space-time grid attribute matrix after the access, if no idle channel exists, storing the service application into a corresponding cache queue, and waiting for the idle channel; and if the service application waiting time in the queue exceeds a threshold value, rejecting the service access.
Preferably, the method for establishing the low-orbit satellite network multi-scale grid and the grid attribute matrix comprises the following steps: and performing two-stage grid division on the ground coverage area of the low-orbit satellite network according to the longitude and latitude changes, dividing the operation period of the satellite, and generating a space-time grid attribute matrix according to ephemeris information of the low-orbit satellite.
Preferably, the information carried in the extracted service application includes mesh ID, source address, destination address, priority, terminal type, mobility trend, and bandwidth requirement.
Preferably, for the fixed terminal service and the high-speed terminal service, the attribute information of the space-time grid is inquired according to the grid ID of the fixed terminal service and the high-speed terminal service, the information of the corresponding grid is extracted, and the satellite service continuity parameter of the fixed terminal service and the satellite service continuity parameter of the high-speed terminal service are generated.
Preferably, the operation period T of the satellite is divided into K time slices, and when each time slice is small enough, the coverage state of the satellite on the grid in the time slice is considered to be unchanged; the large scale grid time slice increment is
Time slice is marked as T 1 、T 2 ……T K The time slice increment of the small-scale grid is->
Time slice is recorded as>
Preferably, the terminal types are classified into high-speed terminal, fixedTerminals, high speed terminals being defined as one time slice increment in the grid
Or>
The terminal moves to the adjacent grid of the grid, which is marked as 01, otherwise, the terminal is a fixed terminal, which is marked as 10.
Preferably, for the fixed terminal service, the attribute information of the spatio-temporal grid is queried by the grid ID, the information of the corresponding grid is extracted, if the grid is a small-scale grid, the grid information at the current time t and t + K/15 is extracted, and if the grid is a large-scale grid, the grid information at the current time t and t + K is extracted.
Preferably, for the high-speed terminal service, according to the movement trend information in the service application, the ID of the next-hop adjacent grid is obtained as I ', the attribute information of the spatio-temporal grid is respectively inquired by using the current grid ID information I and the next-hop adjacent grid ID information I', the information of the corresponding grid is extracted, if the grid is a small-scale grid, the grid information at the current time t and t + K/15 is extracted, and if the grid is a large-scale grid, the grid information at the current time t and t + K is extracted.
Preferably, the search result is counted to generate satellite service continuity parameters of the fixed terminal service
P (t) is a positive integer of 1 or more, L p Representing the continuity of the coverage of the grid where the current service is positioned by the satellite p and meeting the continuity requirement, namely L p The number of the m satellites in the current time slice is C 1 、C 2 …C m ；
Generating satellite service continuity parameters of the high-speed terminal service:
L′ p representing the continuity of coverage of the grid where the current service terminal is located and the adjacent grid arriving at the next time slice by the satellite p; satisfies the continuity requirement L p The number of the satellites of the number of the =1 is m ', m' is an integer greater than or equal to zero, and the number of idle channels of the m 'satellites in the current time slice is C' 1 、C′ 2 …C m′ 。
A computer readable storage medium having stored thereon computer program instructions which, when loaded and executed by a processor, cause the processor to perform the spatiotemporal grid-based low-rail access selection method described above.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the ground coverage area and the operation cycle of the low-earth orbit satellite network, a multi-scale space-time grid is established through geographic longitude and latitude and time slice division, multi-granularity division of services and access resources on the space-time dimension is realized, and differentiated service requirements are quickly matched with the access resources;
(2) According to the invention, an attribute matrix of a space-time grid is generated according to ephemeris information and network state information, grid ID is used as an index, and rapid retrieval of accessible satellite and accessible channel resources can be completed through table lookup, so that complex longitude and latitude position information measurement and calculation of a single service in an access process are avoided;
(3) The method distinguishes the available access resources of the deterministic service and the non-deterministic service, ensures the access efficiency of the non-deterministic service to the maximum extent, and simultaneously ensures the timely access of the deterministic service and the communication continuity requirement, thereby completing the maximum utilization of network access resources;
(4) The invention carries out differentiated access processing flow on the fixed terminal and the high-speed terminal, predicts the geographical position change of the terminal in the next time slice, preferentially ensures the communication continuity of the high-speed terminal and reduces cross-region and cross-beam switching as much as possible.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic diagram of a spatiotemporal grid in accordance with the present invention;
FIG. 3 is a diagram illustrating spatio-temporal grid attributes for a time slice t according to the present invention;
fig. 4 is a format of a service application message of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the low-orbit access selection method based on spatio-temporal grids includes the following steps:
1) Establishing a multi-scale grid and an attribute matrix of a low-orbit satellite network, carrying out two-stage grid division on a ground coverage area of the low-orbit satellite network according to longitude and latitude changes, dividing a satellite operation period T into K time slices, and generating a space-time grid attribute matrix according to low-orbit satellite ephemeris information.
11 The first-level grid, namely the large-scale grid, is divided by steps of x degrees in dimension and y degrees in longitude and equal intervals, wherein x belongs to (0, 180), y belongs to (0, 180), and the second-level grid, namely the small-scale grid, is divided by steps of x/15 degrees in dimension and y/15 degrees in longitude and equal intervals in the first-level grid according to the historical information of the traffic in the first-level grid. If the historical average traffic q in the first-level grid is larger than or equal to M, and M is a positive integer, dividing the first-level grid into two-level grids, and if q is smaller than M, not dividing the second-level grids.
And sequentially carrying out network numbering, wherein the number of the first-level grid is A, the value range of A is [1,2000], the number of the second-level grid is A-b, and the value range of b is [1,15]. When x = y =4, the size of the spatial scale of the grid is represented by equator, the spatial scale of the first-level grid is 512km, and the spatial scale of the second-level grid is 32km.
12 The operation period T of the satellite is divided into K time slices, and when each time slice is small enough, the coverage state of the satellite on the grid is considered to be unchanged in the time slice. The large scale grid time slice increment is
Time slice is marked as T 1 、T 2 ……T K Small rulerThe time slice increment of the degree grid is->
Time slice is recorded as>
The coverage range of the low earth orbit satellite network is divided in a time-space domain by two levels of granularity, and the established time-space grid is shown in figure 2.
13 Using the grid ID as an index, establishing a space-time grid attribute matrix capable of reflecting the satellite coverage condition on each time slice according to low-orbit satellite ephemeris information, and updating the number of idle channels according to a period. The space-time grid attribute of a certain time slice t is shown in fig. 3, the grid is covered by P (t) satellites, and the grid attribute gives the identifier of the covered satellite P and the number N of idle channels p ，p＝[1，P(t)]And P (t) is a positive integer of 1 or more.
2) The service initiates an access application, the format of the service application message is shown in figure 4, and the information of the grid ID where the service application is carried, a source address, a destination address, priority, a terminal type, a mobile trend and bandwidth requirements is extracted. And inquiring attribute information of the space-time grid for the fixed terminal service and the high-speed terminal service according to the grid ID of the fixed terminal service and the high-speed terminal service, extracting information of the corresponding grid, and generating a satellite service continuity parameter of the fixed terminal service and a satellite service continuity parameter of the high-speed terminal service.
21 The priority of the service is 8, the priority is 1,2, 3, 4, 5,6, and the service is a common service.
22 ) priority is 7, 8, the traffic is deterministic traffic. The terminal types are divided into high-speed terminals and fixed terminals, and the high-speed terminals are defined as one time slice increment in the grid
Or>
The terminal moves to the adjacent grid of the grid, which is marked as 01, otherwise, the terminal moves to the adjacent grid of the gridFor the fixed terminal, 10. The moving trend is the adjacent domain information which arrives at the high-speed terminal of the service in the next time slice, and the adjacent domain information is judged according to the moving trend>
The bandwidth requirement is a value of the bandwidth required for the traffic transmission.
22 For fixed terminal service, the attribute information of the space-time grid is inquired by the grid ID, the information of the corresponding grid is extracted, if the grid is a small-scale grid, the grid information of the current time t and t + K/15 is extracted, and if the grid is a large-scale grid, the grid information of the current time t and t + K is extracted.
For the high-speed terminal service, according to the movement trend information in the service application, obtaining the ID of the next-hop adjacent grid as I ', respectively inquiring the attribute information of the space-time grid by using the current grid ID information I and the next-hop adjacent grid ID information I', extracting the information of the corresponding grid, extracting the grid information of the current time t and t + K/15 if the grid is a small-scale grid, and extracting the grid information of the current time t and t + K if the grid is a large-scale grid.
23 To count the search results to generate satellite service continuity parameters for fixed terminal traffic
L p Representing the continuity of the coverage of the grid where the current service is positioned by the satellite p and meeting the continuity requirement, namely L p The number of the satellites in the current time slice is C =1, m is an integer larger than or equal to zero, and the number of idle channels of the m satellites in the current time slice is C 1 、C 2 …C m 。
Generating satellite service continuity parameters of the high-speed terminal service:
wherein p = [1, P (t)]，L′ p Representing the continuity of coverage of the satellite p to the grid where the current service terminal is located and the adjacent grid where the next time slice arrives. Satisfies the continuity requirement L p =1 satelliteM 'satellites are provided, m' is an integer greater than or equal to zero, and the number of idle channels of the m 'satellites in the current time slice is C' 1 、C′ 2 …C m′ 。
3) If the service is a deterministic service, selecting the satellite with the most idle channels for access under the condition of meeting the service continuity in the step 23), and if no idle channel exists, selecting the occupied channel to preempt the access.
The deterministic service has the requirement of determining the limit on parameters such as transmission jitter, service time delay, reliability and the like;
31 If m > 0, then select the number of free channels as max [ C ] 1 ，C m ]The satellite access of (2), go to step 6), if max [ C ] 1 ，C m ]If =0, performing preemption access and entering step 6).
32 If m =0, selecting the satellite access with the largest number of idle channels in the P-m satellites which do not meet the continuity, if no idle channel exists, executing the preemptive access, and entering the step 6).
4) If the service is a non-deterministic service, selecting the satellite with the most idle channels for access, and if no idle channel exists, storing the service application into a corresponding cache queue.
41 For a non-deterministic service application, select N p Maximum satellite access, step 6).
42 If)
And the service application is stored in the cache queue of the grid, and the step 5) is carried out.
The buffer queues are in one-to-one correspondence with grids, the queue length is k, the buffer queue length k is related to the change of the number of grid coverage satellites at the next moment, and
if the number of the covered satellites is reduced, k-l is carried out, and if the number of the covered satellites is increased, k + l and k are positive integers larger than zero.
5) Extracting the service application in the buffer queue, entering step 2), and entering step 7) if the waiting time of the service application in the queue exceeds a threshold b).
6) And allowing service access and updating the multi-scale space-time grid space-time attribute information.
7) Service access is denied.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are not particularly limited to the specific examples described herein.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (10)
1. A low-orbit access selection method based on a space-time grid is characterized by comprising the following steps:
establishing a multi-scale grid and a grid attribute matrix of a low earth orbit satellite network;
after the service initiates an access application, extracting service application carrying information;
for deterministic service, selecting a satellite with the most idle channels for access, and if no idle channel exists, selecting an occupied channel to preempt access; updating the space-time grid attribute matrix after access;
for the non-deterministic service, selecting a satellite with the most idle channels for access, updating a space-time grid attribute matrix after the access, if no idle channel exists, storing the service application into a corresponding cache queue, and waiting for the idle channel; and if the service application waiting time in the queue exceeds a threshold value, rejecting the service access.
2. The low-earth-orbit access selection method of claim 1, wherein the method for establishing the multi-scale grid and the grid attribute matrix of the low-earth-orbit satellite network comprises the following steps: and performing two-stage grid division on the ground coverage area of the low-orbit satellite network according to the latitude and longitude change, dividing the operation period of the satellite, and generating a space-time grid attribute matrix according to the ephemeris information of the low-orbit satellite.
3. The method of claim 1, wherein the information carried in the extracted service application includes mesh ID, source address, destination address, priority, terminal type, mobility trend, and bandwidth requirement.
4. The low-earth-orbit access selection method of claim 3, wherein attribute information of the spatio-temporal grid is queried for the fixed terminal service and the high-speed terminal service according to grid IDs thereof, information of the corresponding grid is extracted, and a satellite service continuity parameter of the fixed terminal service and a satellite service continuity parameter of the high-speed terminal service are generated.
5. The low earth orbit access selection method of claim 1, wherein the operating period T of the satellite is divided into K time slices, and when each time slice is small enough, the coverage state of the satellite on the grid is considered to be unchanged in the time slice; the large scale grid time slice increment is
Time slice is marked as T 1 、T 2 ……T K The time slice increment of the small scale grid is
Time slice is recorded as->
6. The method of claim 5, wherein the terminal types are high speed terminal, fixed terminal, high speed terminal is defined as a time slice increment in the grid
Or>
The terminal moves to the grid adjacent to the grid, which is marked as 01, otherwise, the terminal is a fixed terminal, which is marked as 10.
7. The low-rail access selection method of claim 6, wherein for the fixed terminal service, the attribute information of the spatio-temporal mesh is queried by using a mesh ID, and information of the corresponding mesh is extracted, and if the mesh is a small-scale mesh, mesh information at the current time t and t + K/15 is extracted, and if the mesh is a large-scale mesh, mesh information at the current time t and t + K is extracted.
8. The low-rail access selection method of claim 6, wherein for a high-speed terminal service, according to the mobility trend information in the service application, the ID of the next-hop neighboring grid is obtained as I ', the attribute information of the spatio-temporal grid is respectively queried with the current grid ID information I and the next-hop neighboring grid ID information I', the information of the corresponding grid is extracted, if the current grid is a small-scale grid, the grid information at the current time t and t + K/15 is extracted, and if the current grid is a large-scale grid, the grid information at the current time t and t + K is extracted.
9. The method of claim 6, wherein the search result is counted to generate a satellite service continuity parameter for the fixed terminal service
p＝[1，P(t)]P (t) is a positive integer of 1 or more, L p Representing the continuity of the coverage of the grid where the current service is positioned by the satellite p and meeting the continuity requirement, namely L p The number of the satellites in the current time slice is C =1, m is an integer larger than or equal to zero, and the number of idle channels of the m satellites in the current time slice is C 1 、C 2 …C m ；
Generating satellite service continuity parameters of the high-speed terminal service:
L′ p representing the continuity of coverage of the grid where the current service terminal is located and the adjacent grid reached by the next time slice by the satellite p; satisfies the continuity requirement L p The number of the satellites in the current time slice is C =1, m ' is an integer greater than or equal to zero, and the number of free channels of the m ' satellites in the current time slice is C ' 1 、C′ 2 …C m′ 。
10. A computer readable storage medium having stored thereon computer program instructions which, when loaded and executed by a processor, cause the processor to perform the method of any of claims 1 to 9.
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| CN116506899A (en) * | 2023-06-28 | 2023-07-28 | 成都星联芯通科技有限公司 | Delay processing method, login method, device, master station, small station and storage medium |
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