CN110602753B - Method for solving problem of frequent switching of feeder link of low-rail satellite communication system - Google Patents
Method for solving problem of frequent switching of feeder link of low-rail satellite communication system Download PDFInfo
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- CN110602753B CN110602753B CN201910675813.3A CN201910675813A CN110602753B CN 110602753 B CN110602753 B CN 110602753B CN 201910675813 A CN201910675813 A CN 201910675813A CN 110602753 B CN110602753 B CN 110602753B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00837—Determination of triggering parameters for hand-off
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
Abstract
The invention discloses a method for solving the problem of frequent switching of a feed link of a low-earth-orbit satellite communication system, and belongs to the field of low-earth-orbit satellite communication. The working principle is as follows: pre-estimating the single satellite coverage range of a satellite S when the track position is switched by a cross-gateway station feeder link; dividing a single satellite coverage area into an area A and an area B; the user in the area A is switched to other satellites when leaving the coverage range of the satellite S; when the satellite S wave beam covers and leaves the area A, the area A switching strategy is cancelled; when the user in the area B is in other satellite services, the user is switched to the satellite S when entering the coverage area of the satellite S; when the area B is completely covered by the satellite S, the switching strategy of the area B is cancelled; A. and after the switching strategy of the B area is cancelled, cancelling the A/B area. The method can prevent the user from switching back and forth between the source gateway station and the target gateway station in a very short time when the satellite cross-gateway station feeder link is switched, and improve the overall experience of the system user under the condition of switching the satellite cross-gateway station feeder link.
Description
Technical Field
The invention belongs to the field of low-orbit satellite communication, and particularly relates to a method for solving the problem of frequent switching of a feed link of a low-orbit satellite communication system.
Background
With the rapid development of low-orbit satellite constellations, more and more low-orbit satellite systems are being constructed. The problem associated with the switching of the satellite cross-gateway feeder link scenario, which is unique to low earth orbit satellite systems, has become an important issue for the system solution research. The problem of switching between the channels and stations within a very short time by a user possibly occurs in the low-earth orbit satellite channel and station crossing scene, and two situations exist, namely: when a satellite is switched across a gateway station feeder link, a single satellite coverage area exists under the satellite, users in the area are passively switched across the gateway station along with the satellite, meanwhile, users at the edge of the single satellite area are to be covered by other satellites, and if other satellites are selected for access, switching across the gateway station back and forth in a very short time can possibly occur; case two: users served by other satellites have to switch to the current satellite as soon as they enter the area covered by the current satellite only, at the same time the satellite switches across the gateway station feeder link, and users in the single satellite coverage area passively follow the satellite to switch across the gateway station. Both of the above two situations may cause some users to switch back and forth across gateway stations in a very short time, and the user service experience is affected.
In the ground mobile communication, the switching back and forth between the base stations by the user in a very short time is called ping-pong effect, because the terminal selects the base station with stronger signal intensity to access, the user "shakes" in the base station coverage overlapping area, and the signal intensity of the base station measured by the user terminal changes. The switching ping-pong effect is effectively solved by adopting a double-threshold decision method in the ground mobile communication. The reason why the user can switch back and forth across the gateway station within a very short time in the satellite cross-gateway station scene is essentially different from the reason for generating the ping-pong effect in the ground mobile communication, and the solution of the ground mobile communication is not suitable for the low-orbit satellite mobile communication.
Therefore, aiming at the problem that part of users may switch back and forth across the gateway station in a very short time in the satellite cross-gateway station feeder link switching, an effective strategy is required to be provided to prevent the problem from occurring, and the overall experience of the system user under the satellite cross-gateway station feeder link switching condition is improved.
Disclosure of Invention
In order to prevent a part of users from switching back and forth across the gateway station in a short time during the switching of the satellite across the gateway station feeder link, the invention provides a method for solving the problem of frequent switching of the low-earth satellite system feeder link.
The invention provides a method for solving the problem of frequent switching of a feeder link of a low-rail satellite communication system, as shown in figure 1, the implementation flow of the method comprises the following steps: when the satellite is switched across a gateway station feeder link, the single satellite coverage range budget 1 in the under-satellite coverage area, the single satellite coverage area partition 2, the A area user switching strategy 3, the A area user switching strategy revocation 4, the B area user switching strategy 5, the B area user switching strategy revocation 6 and the revocation partition 7.
The invention is realized by the following technical scheme: a method for solving the problem of frequent switching of a feeder link of a low-rail satellite communication system comprises the following steps:
step 1: the gateway station pre-calculates the geographical range which is only covered by a single satellite S in the coverage area formed by the ground when the satellite S switches the track position across the gateway station feeder link based on ephemeris and satellite-borne parameters;
step 2: dividing the single-satellite coverage geographical area in the step 1 into an area A and an area B; the specific division method comprises the following steps: the method comprises the following steps of vertically dividing a single satellite coverage geographical area into two parts along the movement direction of a satellite S, wherein the part covered by the satellite S firstly is an area A, and the part covered by the satellite S secondly is an area B;
and step 3: after the users in the geographical area A are switched to the target gateway station along with the satellite S, the users are switched to other satellites when the users are about to leave the coverage range of the satellite S;
and 4, step 4: when the satellite S covering beam leaves the area A, canceling the switching strategy aiming at the user of the satellite S in the area A;
and 5: when the user in the geographic area B is still in the service state of other satellites and is about to enter the coverage range of the satellite S, switching from the other satellites to the satellite S;
step 6: when the area B is completely covered by the satellite S, removing the switching strategy of the satellite S for the user in the area B;
and 7: A. after the handover policy is removed, A, B partition for satellite S is removed.
The switching strategy of the users in the area A in the step 3 maximizes the time interval between the switching of the users to the target gateway station along with the satellite S and the switching to other satellites, and prevents the occurrence of the switching of a part of users to cross the gateway station immediately along with the satellite S.
The switching strategy of the B-area users in the step 5 maximizes the time interval between the switching of the users to the satellite S and the switching of the users following the satellite S across the gateway stations, and prevents the switching of a part of users immediately following the satellite S to the satellite S across the gateway stations.
And 7, canceling the partition to ensure that the partition in the switching scene of the satellite S cross gateway station feeder link does not influence the switching of other satellite cross gateway station feeder links.
Compared with the prior art, the method for solving the problem of frequent switching of the feed link of the low-rail satellite communication system has the following beneficial effects:
according to the invention, by partitioning the satellite coverage area in the satellite coverage area switched across the gateway stations, different switching strategies are implemented aiming at different areas, so that the time interval of switching across the gateway stations by a user is maximized, the situation that the user switches back and forth across the gateway stations in a very short time is effectively prevented, and the overall experience of the user is improved.
The method effectively solves the problem that part of users possibly switch back and forth across the gateway station in a very short time in the switching of the feed link of the satellite across the gateway station, is widely suitable for low-orbit satellite systems of various constellation types, and has engineering application value.
Drawings
Fig. 1 is a schematic diagram of a method for preventing a user from switching back and forth across gateway stations in a very short time under a satellite cross-gateway station scene.
Fig. 2 is a schematic diagram of a flow for preventing a user from switching back and forth between gateway stations in a very short time under a scenario of satellite cross-gateway station in the present invention.
Fig. 3 is a schematic view of the under-satellite coverage of an embodiment satellite S at a switched orbital position O across a gateway station feeder link.
Fig. 4 is a schematic diagram of the process of sweeping the satellite S coverage beam through the single-satellite coverage area according to the embodiment.
Detailed Description
The invention is further described with reference to the following figures and examples.
The invention provides a method for solving the problem of frequent switching of a feeder link of a low-rail satellite communication system, which comprises the following components as shown in figure 1: when the satellite is switched across a gateway station feeder link, the single satellite coverage range budget 1 in the under-satellite coverage area, the single satellite coverage area partition 2, the A area user switching strategy 3, the A area user switching strategy revocation 4, the B area user switching strategy 5, the B area user switching strategy revocation 6 and the revocation partition 7.
To illustrate the method for preventing the user from switching back and forth between the gateway stations in a very short time under the scenario of satellite cross-gateway station, the polar orbit constellation is taken as an example, and refer to fig. 3 and 4. The specific processing steps (see fig. 2) are as follows:
step 1: the satellite S is about to have a cross-gateway station feeder link switch;
step 2: and the gateway station pre-calculates the single satellite coverage area of the satellite S in the under-satellite coverage area corresponding to the switching orbit position O of the feeder link of the cross gateway station based on the ephemeris and the satellite-borne parameters. Referring to fig. 3 and 4, the dashed area in fig. 4 is the single-satellite coverage area described above, i.e., the portion of fig. 3 not covered by satellite 1/2/3/4 but covered by satellite S;
and step 3: dividing the single satellite coverage area in the step 2 into an area a and an area B, as shown in fig. 4, wherein the area a is equal to the area B, and a boundary between the area a and the area B is perpendicular to the movement direction of the satellite S;
and 4, step 4: different handover strategies are adopted for users in the area A and the area B. Step 5 to step 9 are a user switching strategy implementation flow of the area A, and step 10 to step 14 are a user switching strategy implementation flow of the area B;
and 5: the area A user is switched to a target gateway station by crossing the gateway station along with the satellite S;
step 6: the user continues to receive the satellite S service;
and 7: judging whether the user is about to leave the coverage of the satellite S, if so, executing a step 8, otherwise, returning to the step 6;
and 8: selecting other satellites to perform user switching;
and step 9: judging whether the coverage of the satellite S leaves the area A, if so, revoking the switching strategy aiming at the satellite S in the area A;
step 10: the users in the B area receive the service of other satellites (namely, the satellite 4 in the figure 4);
step 11: judging whether the user is about to enter the coverage area of the satellite S, if so, executing the step 12, otherwise, returning to the step 10;
step 12: the user executes the switching process to the satellite S;
step 13: the user crosses the gateway station to switch to the target gateway station along with the satellite S;
step 14: judging whether the area B is completely covered by the satellite S, and if the conditions are met, canceling the switching strategy of the satellite S in the area B;
step 15: when the A, B zone switch policy is removed, the A/B partition for satellite S is removed.
Referring to fig. 4, (a) shows that the last user in the B-zone enters the coverage area of the satellite S before the satellite S crosses the gateway station is the user in the edge area of the B-zone close to the satellite 4, if the user is switched to the satellite S just before leaving the satellite 4, the satellite S is switched to the gateway station, and the switched user has to follow the satellite S to switch back to the target gateway station, as shown in (B). By adopting the strategies of the steps 11 and 12, the users in the marginal area of the B area close to the satellite 4 can be switched to the satellite S earlier, and the time between the switching of the users to the satellite S and the switching of the users along with the satellite S across gateway stations is maximized.
Referring to fig. 4, (c) shows that the user in the area a first enters the coverage area of the satellite 2 after the satellite S crosses the gateway station, the user in the area a is the user in the edge area close to the satellite 2, and if the user is switched as soon as entering the satellite 2, the user is switched to the target gateway station and then switched back to the source gateway station. With the strategy of steps 7, 8, users in zone a near the edge area of satellite 2 can be handed over to satellite 2 later, maximizing the time between the user switching across gateway stations following satellite S and handing over to satellite 2, as shown in (d).
The above detailed description of the embodiments of the present invention, and the detailed description of the embodiments of the present invention used herein, is merely intended to facilitate the understanding of the methods and apparatuses of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (1)
1. A method of low earth orbit satellite communications system feeder link switching, the method comprising:
step 1: the gateway station pre-calculates the geographical range which is only covered by a single satellite S in the coverage area formed by the ground when the satellite S switches the track position across the gateway station feeder link based on ephemeris and satellite-borne parameters;
step 2: dividing the single-satellite coverage geographical area in the step 1 into an area A and an area B; the specific division method comprises the following steps: the method comprises the following steps of vertically dividing a single satellite coverage geographical area into two parts along the movement direction of a satellite S, wherein the part covered by the satellite S firstly is an area A, and the part covered by the satellite S secondly is an area B;
and step 3: after the users in the geographical area A are switched to the target gateway station along with the satellite S, judging whether the users are about to leave the coverage area of the satellite S, if so, selecting other satellites to execute user switching;
and 4, step 4: when the satellite S covering beam leaves the area A, canceling the switching strategy aiming at the user of the satellite S in the area A;
and 5: judging whether the user is about to enter the coverage area of the satellite S or not when the user in the geographic area B is still in other satellite service states, and if so, executing a switching process to switch to the satellite S by the user; the user crosses the gateway station to switch to the target gateway station along with the satellite S;
step 6: when the area B is completely covered by the satellite S, removing the switching strategy of the satellite S for the user in the area B;
and 7: A. after the handover policy is removed, A, B partition for satellite S is removed.
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| 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 |
| CN112887005B (en) * | 2021-01-06 | 2022-11-15 | 成都天奥集团有限公司 | Full-exchange method and device for eliminating satellite switching influence |
| CN113395104B (en) * | 2021-06-15 | 2023-01-31 | 中国科学院微小卫星创新研究院 | Feeder link switching method based on global service distribution |
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