CN114157344A - Method for supporting lossless switching of satellite feed link - Google Patents
Method for supporting lossless switching of satellite feed link Download PDFInfo
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- CN114157344A CN114157344A CN202111495202.4A CN202111495202A CN114157344A CN 114157344 A CN114157344 A CN 114157344A CN 202111495202 A CN202111495202 A CN 202111495202A CN 114157344 A CN114157344 A CN 114157344A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
Abstract
The invention discloses a method for supporting lossless switching of a satellite feed link, belongs to the field of satellite communication, and particularly relates to the method for lossless switching of the satellite feed link. Aiming at the requirement of feed point-to-point data transmission in a low-orbit satellite communication system of a base station on the day on the lossless switching of a feed link of a satellite across a gateway station, the invention adds interactive signaling for assisting the lossless switching and switching cooperative signaling in interfaces of the gateway station and the gateway station, realizes the lossless data transmission of the satellite carrying the base station in the feed link switching across the gateway station, ensures the integrity of landing service data and improves the user experience.
Description
Technical Field
The invention belongs to the field of satellite communication, and particularly relates to a lossless switching method of a satellite feed link.
Background
In a satellite communication system, a satellite provides coverage for a user, and user service data finally needs to fall to the ground through a gateway station to establish the gateway station and a satellite point-to-point transmission link, namely a feeder link. A satellite to gateway station feeder link may be established when the satellite is within the coverage area of a gateway station antenna. In low earth satellite systems, as the satellite moves, switching of the satellite across feeder links between gateway stations will occur.
Currently, there are three main architectures in a low earth orbit satellite system, which are respectively a transparent forwarding/data acquisition forwarding mode, a DU staring mode, and a base station staring mode. In either architecture, the satellite and ground gateway station feeder connections are always present. In a low-orbit satellite communication system, services such as voice, video, internet data and the like are mainly included, and all service data must be transmitted through a feed link under a transparent forwarding/data acquisition forwarding architecture; in the DU staring mode, all service data still needs to be transmitted through the feeder link; in the base station uplink mode, since the Internet data must be connected to the ground Internet network, the Internet data needs to be transmitted through the feeder link.
In a low earth orbit satellite, if the satellite load can only establish a feeder link connection with one gateway station, a link interruption must occur during the switching process of the satellite across the gateway station feeder links. When the low-earth-orbit satellite provides broadband communication, internet data needs to be transmitted through a feeder link, the transmission bandwidth is large, and no switching protocol is agreed, so that a large amount of data can be omitted when the satellite is switched across gateway stations.
In three architectures of transparent forwarding/data acquisition forwarding, DU satellite-accessing and base station antenna-accessing modes, the former two architectures are point-to-point transmission of 'satellite-gateway station' in the physical form of a feed link, but are logically point-to-multipoint transmission of 'ground base station/CU-multiuser'; in the base station uplink mode, the satellite user side is a base station-multi-user point-to-multipoint communication mode, and the feed side is a satellite-gateway station point-to-point data transmission mode.
Aiming at the problem of data loss in satellite feed switching under a transparent forwarding/data acquisition forwarding mode and a DU staring mode, the problem of feed lossless switching can be better solved by aiming at the process of user lossless switching at present. Aiming at the problem of data loss in the uplink mode point-to-point data transmission switching process of a base station, the current solution is to adopt data retransmission of a network layer to avoid packet loss. But in case a large number of consecutive data packets are lost, the retransmission efficiency is reduced. A method for supporting lossless switching between a satellite and a gateway station needs to be established for low-earth orbit satellite cross-gateway station feed switching, so that efficient transmission of internet data is ensured.
Disclosure of Invention
Aiming at the requirement of feed point-to-point data transmission in a low-orbit satellite communication system of a base station on the day on the lossless switching of a feed link of a satellite across a gateway station, the invention adds interactive signaling for assisting the lossless switching and switching cooperative signaling in interfaces of the gateway station and the gateway station, realizes the lossless data transmission of the satellite carrying the base station in the feed link switching across the gateway station, ensures the integrity of landing service data and improves the user experience.
The technical scheme of the invention is a method for supporting lossless switching of a satellite feed link, which comprises the following steps:
step 1: the operation control center plans a constellation operation plan in a unified mode, and determines the cross-gateway station feed time of the satellite and a target gateway station; before the feed switching time arrives, the original gateway station uploads a target gateway station feed beam parameter, feed switching time and a target gateway station position through a feed link with a satellite, and simultaneously sends the satellite load feed beam parameter, the feed switching time and the target gateway station feed beam pointing designated position information to the target gateway station through a ground optical fiber;
step 2: when the feed switching time planned by the operation and control center arrives, the satellite interrupts feed data transmission, caches downlink (from the satellite to the gateway station) data, and simultaneously adjusts a satellite feed beam to point to the position of a target gateway station; the original gateway station interrupts the transmission of feed data and buffers uplink (gateway station to satellite) data; the target gateway station adjusts the feed beam to point to the designated position, if the target gateway station antenna is a paraboloid, the target gateway station antenna needs to adjust the feed beam to point to the designated position before the feed switching moment is reached;
and step 3: the satellite transmits a beacon signal to a target gateway station through a satellite feed beam;
and 4, step 4: after receiving the beacon signal, the target gateway station carries out feed link tracking synchronization;
and 5: after the target gateway station tracks and synchronizes with the satellite feed beam, continuously sending tracking synchronization information to the satellite;
step 6: after receiving the tracking synchronization information sent by the target gateway station, the satellite sends downlink data to the target gateway station;
and 7: after the target gateway station starts to receive the data issued by the satellite, sending a feed switching end message to the original gateway station;
and 8: after step 2, the original gateway station transmits an SN state to the target gateway station, wherein the SN state represents the number condition of the data packet to be forwarded;
and step 9: the original gateway station transmits a data packet to the target gateway station, and the target gateway station caches the data;
step 10: after the cache data of the original gateway station is emptied, sending forward data forwarding end information to a target gateway station;
step 11: and after receiving the message of 'forwarding data forwarding end', the target gateway station transmits data to the satellite through the feeder link.
Through the switching flow information of the low-orbit satellite feed link, the lossless switching of the feed point-to-point data transmission of the feed in the low-orbit satellite communication system of the base station to the feed link of the satellite cross gateway station can be ensured.
Although the interface signaling between the satellite and the gateway station feeder link and the interface signaling between the gateway station and the gateway station are added through the steps 5, 7, 8 and 10, the cost is low, the normal communication condition is not influenced, the data is cached in time after the feeder link is interrupted in the step 2, and the data lossless handover protocol is established in the steps 6, 8 and 9, so that the continuity of data transmission is increased, the lossless data transmission of the satellite carrying the base station in the cross-gateway station feeder link switching is realized, the completeness of the landing service data is ensured, and the user experience is improved.
Drawings
FIG. 1 is a schematic diagram of a low earth orbit satellite feeder link switching scenario;
FIG. 2 is a diagram of low earth orbit satellite feeder link switching process information;
FIG. 3 is a diagram illustrating an exemplary low-earth orbit satellite feeder link switching scenario;
fig. 4 shows a satellite cross-gateway station a and a gateway station B power supply switching process.
Detailed Description
The method for lossless switching of the satellite feeder link is designed based on the following low-orbit satellite system.
As shown in fig. 3, a BBU (baseband processing unit) device, an IMS (IP multimedia system), and a UPF (user plane network element) server are mounted on a satellite load, and a ground gateway station is connected to the internet. The satellite feed antenna adopts a phased array antenna, meanwhile, the feed connection is only established with one gateway station, and the gateway station adopts a full-space phased array antenna. Due to the fact that the IMS and the UPF server are stared, when the satellite is connected with the gateway station A in a feeding mode, user internet service data are mainly transmitted between the gateway station and the satellite. The power supply switching process of the satellite across the gateway station a and the gateway station B is shown in fig. 4, and the specific implementation process is as follows.
Step 1: the operation control center plans the satellite to be switched from the gateway station A to the gateway station B, and the specific switching time is t0。t0Before the moment, the station A sends the frequency f of the feed beam signal of the station B to the satelliteGTime t of power supply switching0And gateway station B location (x)B,yB,hB) While the gateway station A sends the beacon frequency f of the satellite load feed beam to the gateway station B through the ground optical fiberSTime t of power supply switching0Satellite predetermined position (x)S,yS,hS) And the like;
step 2: t is t0When the time arrives, the satellite interrupts the feed data transmission and caches the data to be sent to the gateway station A; the gateway station A interrupts the feed data transmission and caches the data to be transmitted to the satellite; satellite-adjusted feed beam pointing to gateway station B location (x)B,yB,hB) (ii) a The gateway station B adjusts the feed beam to point to a specified position (x)S,yS,hS)；
And step 3: the satellite transmits a beacon signal through a satellite feed beam;
and 4, step 4: the gateway station B searches beacon signals to perform feed link tracking synchronization;
and 5: after the gateway station B tracks and synchronizes the satellite feed beam, continuously sending tracking synchronization information to the satellite;
step 6: after receiving the tracking synchronization information sent by the gateway station B, the satellite sends downlink data to the gateway station B;
and 7: after the gateway station B starts to receive data sent by the satellite, a 'feed switching end' message is sent to the gateway station A;
and 8: after step 2, the gateway station A transmits an SN state to the gateway station B, wherein the SN state represents the number condition of the data packet to be forwarded;
and step 9: the gateway station A transmits a data packet to the gateway station B, and the gateway station B caches the data;
step 10: after the gateway station A empties the cache data, sending forward data forwarding end information to the gateway station B;
step 11: and after receiving the message of 'forwarding data forwarding end', the gateway station B transmits data to the satellite through the feeder link.
If the uplink transmission rate of the feed link between the satellite and the ground gateway is 1Gbps, the downlink transmission rate is 500 Mbps. In the step 2, the pointing time of the satellite for adjusting the feed beam is about 1us, if the height of the satellite is 600km, the ground gateway station can realize satellite tracking reception with an elevation angle of 10 degrees, the signal space propagation time is about 3ms, the time for completing signal acquisition by the ground gateway station is about 10ms, and the time for completing signal acquisition by the satellite is about 10 ms. During the period from the disconnection of the satellite and the original gateway station to the establishment of a new feeder link with the target gateway station, if no lossless switching mechanism exists, the downlink data loss amount is 13Mb, and the uplink data loss amount is 26 Mb.
By the lossless switching method, before step 6, the satellite caches 13Mb data which needs to be sent to the ground station through the feeder link, and when the step 6 is completed, the gateway station B is sent to ensure lossless transmission of downlink data; after step 2, the station a continuously forwards the uplink data to the station B, which buffers the 26Mb data to be transmitted upstream and, when step 11, sends the buffered data up. The transmission bandwidth of the feeder link can be expanded as required in the process of sending the buffered data, and the transmission of subsequent data is not influenced. Through the method of lossless switching of the satellite feeder link, the lossless data transmission between the satellite and the ground gateway station is realized in the process of the switching of the satellite from the gateway station A to the gateway station B across the gateway stations.
The method for supporting the lossless switching of the satellite feeder link is a flow based on a physical layer and a link layer, effectively solves the problem of a large amount of packet loss in the switching of the low-orbit satellite cross-gateway station feeder link under the uplink mode of a base station, and can ensure the non-inductive experience of user services; compared with the method of retransmitting the lost data packet through the network layer, the method can shorten the packet forwarding time.
Claims (1)
1. A method of supporting lossless handover of a satellite feeder link, the method comprising:
step 1: the operation control center plans a constellation operation plan in a unified mode, and determines the cross-gateway station feed time of the satellite and a target gateway station; before the feed switching time arrives, the original gateway station uploads a target gateway station feed beam parameter, feed switching time and a target gateway station position through a feed link with a satellite, and simultaneously sends the satellite load feed beam parameter, the feed switching time and the target gateway station feed beam pointing designated position information to the target gateway station through a ground optical fiber;
step 2: when the feed switching time planned by the operation and control center arrives, the satellite interrupts feed data transmission, caches downlink (from the satellite to the gateway station) data, and simultaneously adjusts a satellite feed beam to point to the position of a target gateway station; the original gateway station interrupts the transmission of feed data and buffers uplink (gateway station to satellite) data; the target gateway station adjusts the feed beam to point to the designated position, if the target gateway station antenna is a paraboloid, the target gateway station antenna needs to adjust the feed beam to point to the designated position before the feed switching moment is reached;
and step 3: the satellite transmits a beacon signal to a target gateway station through a satellite feed beam;
and 4, step 4: after receiving the beacon signal, the target gateway station carries out feed link tracking synchronization;
and 5: after the target gateway station tracks and synchronizes with the satellite feed beam, continuously sending tracking synchronization information to the satellite;
step 6: after receiving the tracking synchronization information sent by the target gateway station, the satellite sends downlink data to the target gateway station;
and 7: after the target gateway station starts to receive the data issued by the satellite, sending a feed switching end message to the original gateway station;
and 8: after step 2, the original gateway station transmits an SN state to the target gateway station, wherein the SN state represents the number condition of the data packet to be forwarded;
and step 9: the original gateway station transmits a data packet to the target gateway station, and the target gateway station caches the data;
step 10: after the cache data of the original gateway station is emptied, sending forward data forwarding end information to a target gateway station;
step 11: and after receiving the message of 'forwarding data forwarding end', the target gateway station transmits data to the satellite through the feeder link.
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| WO2024031462A1 (en) * | 2022-08-10 | 2024-02-15 | 北京小米移动软件有限公司 | Communication control method, system and apparatus, communication device, and storage medium |
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