CN114157344B - 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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- CN114157344B CN114157344B CN202111495202.4A CN202111495202A CN114157344B CN 114157344 B CN114157344 B CN 114157344B CN 202111495202 A CN202111495202 A CN 202111495202A CN 114157344 B CN114157344 B CN 114157344B
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- H—ELECTRICITY
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Abstract
The invention discloses a method for supporting lossless switching of a satellite feed link, which belongs to the field of satellite communication, in particular to a method for supporting lossless switching of a satellite feed link. Aiming at the demand of the number transfer of the feed points to the lossless switching of the feed links of the satellite crossing gateway station in the low orbit satellite communication system on the day of the base station, the invention adds the interactive signaling for assisting the lossless switching in the feed link interface and the switching cooperative signaling in the gateway station and the gateway station interface, thereby realizing the lossless data transmission of the satellite carrying the base station in the feed link switching of the crossing gateway station, ensuring the integrity of the ground service data and improving the user experience.
Description
Technical Field
The invention belongs to the field of satellite communication, in particular 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 land through a gateway station to establish a gateway station and a satellite point-to-point transmission link, namely a feeder link. The satellite to gateway station feeder link may be established when the satellite is within the gateway station antenna coverage area. In a low orbit satellite system, as the satellite moves, a handoff of the satellite across the feeder link between gateway stations will occur.
Three architectures are mainly adopted in the current low orbit satellite system, namely transparent forwarding/data acquisition forwarding, DU staring and base station staring modes. In either architecture, the feed connection of the satellite to the ground gateway station is always present. In a low orbit satellite communication system, mainly comprising services such as voice, video, internet data and the like, under a transparent forwarding/data acquisition forwarding architecture, all service data must be transmitted through a feed link; in the DU staring mode, all service data still need to be transmitted through a feed link; in the base station's on-the-sky mode, the Internet data needs to be transmitted via the feeder link because the Internet data must be connected to the ground Internet network.
In a low orbit satellite, if the satellite load can only establish feed link connection with one gateway station, link interruption is necessarily generated in the process of switching the feed link of the satellite crossing the gateway station. When the low orbit satellite provides broadband communication, the internet data needs to be transmitted through a feed link, the transmission bandwidth is large, and a switching protocol is not agreed, so that a large amount of data can be omitted when the satellite switches across the gateway station.
In three architectures of transparent forwarding/data acquisition forwarding, DU staring and base station staring modes, the former two are point-to-point transmission of satellite-gateway station in physical form of feed link, but are logically point-to-multipoint transmission of ground base station/CU-multiuser; in the base station antenna mode, the satellite user side is a point-to-multipoint communication mode of 'base station-multiuser', and the feed side is a point-to-point data transmission mode of 'satellite-gateway station'.
Aiming at the problem of data loss in satellite feed switching under transparent forwarding/data acquisition forwarding and DU staring mode, the feed lossless switching problem can be better solved aiming at the current user lossless switching flow. Aiming at the problem of data loss in the switching process of the point-to-point data transmission in the antenna mode of the base station, the current solution is to adopt the data retransmission of a network layer to avoid packet loss. But in case of a large number of consecutive data packets being lost, the retransmission efficiency is reduced. A set of method for supporting lossless switching between the satellite and the gateway station is established aiming at low-orbit satellite cross-gateway station feed switching, so that efficient transmission of internet data is ensured.
Disclosure of Invention
Aiming at the demand of the number transfer of the feed points to the lossless switching of the feed links of the satellite crossing gateway station in the low orbit satellite communication system on the day of the base station, the invention adds the interactive signaling for assisting the lossless switching in the feed link interface and the switching cooperative signaling in the gateway station and the gateway station interface, thereby realizing the lossless data transmission of the satellite carrying the base station in the feed link switching of the crossing gateway station, ensuring the integrity of the ground service data and improving the user experience.
The technical scheme of the invention is a method for supporting lossless switching of satellite feed links, which comprises the following steps:
step 1: the operation control center uniformly plans a constellation operation plan and determines the feeding moment of the satellite crossing gateway station and the target gateway station; before the feed switching time arrives, the original gateway station uploads the feed beam parameters, the feed switching time and the target gateway station position of the target gateway station through a feed link with a satellite, and simultaneously sends the satellite load feed beam parameters, the feed switching time and the information that the feed beam of the target gateway station points to the designated position to the target gateway station through a ground optical fiber;
step 2: when the feed switching time planned by the operation control center arrives, the satellite interrupts feed data transmission, caches downlink (satellite to gateway station) data, and adjusts the position of a satellite feed beam pointing to a target gateway station; the original gateway station interrupts the feed data transmission and caches the uplink (gateway station to satellite) data; the target gateway station adjusts the feed beam to point to the appointed position, and if the target gateway station antenna is parabolic, the target gateway station antenna needs to adjust the feed beam to point to the appointed position before the feed switching moment arrives;
step 3: the satellite transmits a beacon signal to the target gateway station through a satellite feed beam;
step 4: after receiving the beacon signal, the target gateway station performs feed link tracking synchronization;
step 5: after tracking the feed beam of the synchronous upper satellite, the target gateway station continuously transmits a tracking synchronization message to the satellite;
step 6: after receiving tracking synchronization information sent by a target gateway station, a satellite sends downlink data to the target gateway station;
step 7: after the target gateway station starts to receive the satellite transmitting data, sending a feed switching end message to the original gateway station;
step 8: after the step 2 is completed, 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;
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 buffer data of the original gateway station is emptied, sending a message of 'forwarding end of forward data' to the target gateway station;
step 11: and after receiving the message of 'forward data forwarding end', the target gateway station mutually transmits data with the satellite through a feed link.
By the low-orbit satellite feed link switching flow information, the lossless switching of the feed point pair number transfer pair satellite cross-gateway feed link in the low-orbit satellite communication system on the sky of the base station can be ensured.
According to the scheme of the invention, although the interface signaling of the feed links of the satellite and the gateway station and the interface signaling between the gateway station and the gateway station are increased through the steps 5, 7, 8 and 10, the overhead is small, the normal communication condition is not influenced, the data is buffered in time after the feed links are interrupted in the step 2, and the data lossless handover protocol is established through the steps 6, 8 and 9, so that the continuity of data transmission is improved, the lossless data transmission of the satellite carrying the base station in the feed link switching of the cross gateway station is realized, the integrity of the landing service data is ensured, and the user experience is improved.
Drawings
FIG. 1 is a schematic diagram of a low-orbit satellite feeder link switching scenario;
FIG. 2 is a low-orbit satellite feeder link switching flow information;
FIG. 3 is a schematic diagram of an exemplary low-orbit satellite feeder link switching scenario;
fig. 4 is a feed switching flow of the satellite across gateway station a and gateway station B.
Detailed Description
A satellite feed link lossless switching method is designed based on the following low-orbit satellite system.
As shown in fig. 3, the satellite payload is equipped with BBU (baseband processing unit) equipment, IMS (IP multimedia system) and UPF (user plane network element) servers, and the ground gateway station is connected to the internet. The satellite feed antenna adopts a phased array antenna, and simultaneously establishes feed connection with only one gateway station, and the gateway station adopts a full-space-domain phased array antenna. Because the IMS and UPF servers are stared, when the satellite is in feed connection with the gateway station A, user Internet service data is mainly transmitted between the gateway station and the satellite. The feed switching flow of the satellite crossing gateway station A and the gateway station B is shown in fig. 4, and the specific implementation flow is as follows.
Step 1: the operation control center plans the satellite to be fed and switched from the gateway station A to the gateway station B, and the specific switching time is t 0 。t 0 Before the moment, the gateway station A feeds the satellite with the beam signal frequency f to the gateway station B G Feed switching time t 0 And gateway station B position (x B ,y B ,h B ) While gateway station a transmits satellite payload feed beam beacon frequency f to gateway station B via terrestrial optical fiber S Feed switching time t 0 Satellite preset position (x S ,y S ,h S ) Information such as the like;
step 2: t is t 0 When the time arrives, the satellite interrupts feed data transmission and caches the data which needs to be sent to the gateway station A; the gateway station A interrupts feed data transmission and caches data to be sent to the satellite; satellite-modulated feed beam pointing to gateway station B location (x B ,y B ,h B ) The method comprises the steps of carrying out a first treatment on the surface of the Gateway station B adjusts the feed beam pointing to a specified position (x S ,y S ,h S )；
Step 3: the satellite transmits a beacon signal through a satellite feed beam;
step 4: the gateway station B searches the beacon signal to carry out tracking synchronization of the feed link;
step 5: after the gateway station B tracks the feed beam of the synchronous upper satellite, continuously transmitting a tracking synchronization message 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;
step 7: after the gateway station B starts to receive the satellite transmitting data, sending a feed switching end message to the gateway station A;
step 8: after the step 2 is completed, 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;
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 buffer data of the gateway station A is emptied, sending a message of 'forwarding end of forward data' to the gateway station B;
step 11: and after receiving the message of 'forward data forwarding end', the gateway station B mutually transmits data with the satellite through a feeder link.
If the uplink transmission rate of the satellite and ground signal Guan Zhanjian feeder link is 1Gbps, the downlink transmission rate is 500Mbps. In the step 2, the pointing time of the satellite adjusting feed beam is about 1us, if the satellite height is 600km, the ground gateway station can realize satellite tracking and receiving with the elevation angle of 10 degrees, the signal space propagation time is about 3ms, the time for the ground gateway station to finish signal capturing is about 10ms, and the time for the satellite to finish signal capturing of the ground station is about 10ms. And when the satellite and the original gateway station are disconnected until a new feed link is established with the target gateway station, if a lossless switching mechanism is not provided, the downlink data loss amount is 13Mb, and the uplink data loss amount is 26Mb.
According to the lossless cutting method, before the step 6, the satellite caches 13Mb data which is required to be sent to the ground station through the feed link, and after the step 6 is completed to establish the feed link synchronization, the gateway station B is sent down, so that the lossless transmission of downlink data is ensured; after step 2, gateway station a continuously forwards the uplink data to gateway station B, which caches the 26Mb data that needs to be transmitted in the uplink, and when step 11, it sends up the cached data. The transmission bandwidth of the feeder link can be expanded as required in the process of sending the cache data, and the transmission of the subsequent data is not affected. By the method of lossless switching of the satellite feed link, lossless data transmission between the satellite and the ground gateway station is realized in the process of switching 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 massive packet loss of data in the switching of the low-orbit satellite feeder link crossing gateway station in a base station overhead mode, and can ensure the noninductive experience of user business; compared with the method of retransmitting the data packet after being lost through the network layer, the method can shorten the packet transfer time.
Claims (1)
1. A method of supporting lossless handover of a satellite feeder link, the method comprising:
step 1: the operation control center uniformly plans a constellation operation plan and determines the feeding moment of the satellite crossing gateway station and the target gateway station; before the feed switching time arrives, the original gateway station uploads the feed beam parameters, the feed switching time and the target gateway station position of the target gateway station through a feed link with a satellite, and simultaneously sends the satellite load feed beam parameters, the feed switching time and the information that the feed beam of the target gateway station points to the designated position to the target gateway station through a ground optical fiber;
step 2: when the feed switching time planned by the operation control center arrives, the satellite interrupts feed data transmission, caches the data from the satellite to the gateway station, and adjusts the position of the satellite feed beam pointing to the target gateway station; the original gateway station interrupts feed data transmission and caches data from the gateway station to the satellite; the target gateway station adjusts the feed beam to point to the appointed position, the target gateway station antenna is a paraboloid, and the target gateway station antenna needs to adjust the feed beam to point to the appointed position before the feed switching moment arrives;
step 3: the satellite transmits a beacon signal to the target gateway station through a satellite feed beam;
step 4: after receiving the beacon signal, the target gateway station performs feed link tracking synchronization;
step 5: after tracking the feed beam of the synchronous upper satellite, the target gateway station continuously transmits a tracking synchronization message to the satellite;
step 6: after receiving tracking synchronization information sent by a target gateway station, a satellite sends downlink data to the target gateway station;
step 7: after the target gateway station starts to receive the satellite transmitting data, sending a feed switching end message to the original gateway station;
step 8: after the step 2 is completed, 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;
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 buffer data of the original gateway station is emptied, sending a message of 'forwarding end of forward data' to the target gateway station; step 11: and after receiving the message of 'forward data forwarding end', the target gateway station mutually transmits data with the satellite through a feed link.
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| CN115209446B (en) * | 2022-06-13 | 2023-07-25 | 爱浦路网络技术(北京)有限公司 | Core network cloud service communication method, system, device and medium based on satellite |
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