CN113853000B - Inter-satellite switching method for low-orbit satellite system - Google Patents
Inter-satellite switching method for low-orbit satellite system Download PDFInfo
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- CN113853000B CN113853000B CN202111133750.2A CN202111133750A CN113853000B CN 113853000 B CN113853000 B CN 113853000B CN 202111133750 A CN202111133750 A CN 202111133750A CN 113853000 B CN113853000 B CN 113853000B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000002860 competitive effect Effects 0.000 claims description 5
- 230000036963 noncompetitive effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 17
- 238000013461 design Methods 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 3
- 230000011664 signaling Effects 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 241000282320 Panthera leo Species 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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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
- H04W36/0055—Transmission or use of information for re-establishing the radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B7/18521—Systems of inter linked satellites, i.e. inter satellite service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
- H04W36/38—Reselection control by fixed network equipment
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/16—Gateway arrangements
Abstract
The invention discloses a low-orbit satellite system inter-satellite switching method, which relates to a service for forwarding flow data of the low-orbit satellite system inter-satellite switching. The method for deploying network elements and designing signaling for inter-satellite handover in a low-orbit satellite system is described in detail. The method mainly comprises the steps of informing a ground access gateway to enter a data forwarding state by designing a source satellite-borne base station in inter-satellite switching, and putting data forwarding process on the ground access gateway instead of an inter-satellite link to realize the downlink forwarding data, so that the influence of high inter-satellite link data transmission pressure on the data processing capability requirement of the satellite-borne base station is optimized, and the situation that the forwarding data does not lose packets is ensured. The invention can be applied to the inter-satellite switching scene of a low-orbit satellite system, can effectively lighten the pressure of the data transmission task of an inter-satellite link, reduce the design complexity of the inter-satellite link and simultaneously ensure that the data transmission is not lost.
Description
Technical Field
The invention discloses an inter-satellite switching method of a low-orbit satellite system, and relates to a process of switching a satellite terminal from a source satellite-borne base station to a target satellite-borne base station in the field of satellite mobile communication.
Background
An inter-satellite link refers to a communication link established between satellites, also known as an interplanetary link or a cross-link. The information transmission and exchange among the satellites are realized through the inter-satellite links, and a plurality of satellites can be interconnected together to form a space communication network which takes the satellites as exchange nodes, so that the dependence of the satellite communication system on a ground network is reduced. The inter-satellite links can be divided into inter-satellite links between satellites in the same type of orbit (e.g., GEO-GEO, LEO-LEO, etc.) and inter-satellite links between satellites in different types of orbits (LEO-GEO, etc.) according to the orbits in which the satellites are located. In recent years, the inter-satellite link has become a research hotspot under the push of low-orbit communication constellations featuring broadband, large capacity, low delay, global coverage, and the like. However, there are difficulties in the inter-satellite link, such as complexity in designing the inter-satellite link and interference of the link, loss of data transmission, and routing with increase of satellite nodes.
Disclosure of Invention
The invention aims to solve the technical problem of avoiding the problem in the background technology and designs a low-orbit satellite system inter-satellite switching method, which is realized by arranging the data forwarding process in the inter-satellite switching in a ground access gateway, so that the influence of high inter-satellite link data transmission pressure on the data processing capability of a satellite-borne base station is optimized, and in addition, the uplink and downlink data forwarding of data are controlled in the ground access gateway, so that the data transmission is ensured not to be lost.
The invention adopts the technical scheme that:
the inter-satellite switching method of the low-orbit satellite system is realized based on the low-orbit satellite system consisting of a satellite terminal, a source satellite-borne base station, a target satellite-borne base station, a ground access gateway and a core network; the method comprises the following steps:
(1) The satellite terminal performs switching judgment, and if the switching type is determined to be inter-satellite switching, the switching result is reported to the source satellite-borne base station;
(2) After the source satellite-borne base station receives the switching result, verifying whether the result accords with the relation with the adjacent base station, if so, storing the context code of the current satellite terminal, then assembling the switching request and sending the switching request to the target satellite-borne base station, and executing the step (3); if not, the satellite terminal is attached to the target satellite-borne base station;
(3) After receiving the switching request, the target satellite-borne base station firstly decodes to obtain the context of the satellite terminal, then applies for satellite terminal resources, configures the context of the air interface access layer, sends E1 channel establishment to the ground access gateway after configuration is completed, and establishes a corresponding data channel at the ground access gateway;
(4) The target satellite-borne base station applies for resources and relevant configuration codes of the satellite terminal to store, assembles a switching request response and sends the switching request response to the source satellite-borne base station;
(5) After receiving the switching request response, the source satellite-borne base station firstly decodes to obtain relevant configuration parameters of the satellite terminal at the target satellite-borne base station, and then assembles an RRC reconfiguration message and sends the RRC reconfiguration message to the satellite terminal; meanwhile, the source satellite-borne base station assembles a data forwarding notice and sends the notice to the ground access gateway;
(6) After receiving the data forwarding notification, the ground access gateway enters a data forwarding state, and forwards downlink data sent by the core network to a data channel established by the target satellite-borne base station and the ground access gateway for caching; meanwhile, after receiving the RRC reconfiguration message of the source satellite-borne base station, the satellite terminal configures each layer according to the appointed parameters of the target satellite-borne base station, initiates non-competitive random access to the target satellite-borne base station, and after the attachment is completed, sends an RRC reconfiguration completion message to the target satellite-borne base station, and then the step (7) is executed; if the satellite terminal fails to configure each layer, the satellite terminal initiates competitive random access and reattaches to the target satellite-borne base station;
(7) After receiving the RRC reconfiguration completion message of the satellite terminal, the target satellite-borne base station sends a path switching request message to the ground access gateway;
(8) After receiving the path switching request message, the ground access gateway firstly transmits the data cached in the data channel to the satellite terminal through the target satellite-borne base station, and then transmits the path switching request to the core network;
(9) After receiving the path switching request message, the core network switches the downlink data anchor point from the source satellite-borne base station to the target satellite-borne base station, and then sends a path switching request response to the target satellite-borne base station through the ground access gateway;
(10) After receiving the path switching request response, the target satellite-borne base station assembles a context release message of the satellite terminal and sends the context release message to the source satellite-borne base station;
(11) And after the source satellite-borne base station receives the release of the context of the satellite terminal, releasing the context of the satellite terminal and configuration of each layer, and completing inter-satellite switching.
Compared with the prior art, the invention has the following advantages:
1. the invention designs an improved inter-satellite switching method, which places the data forwarding process in a ground access gateway, reduces the pressure of the data transmission task of an inter-satellite link and reduces the design complexity of the inter-satellite link.
2. The inter-satellite switching flow designed by the invention can ensure that the data transmission task in the switching process is controlled by the ground access gateway, so that the data transmission is completed in the ground access gateway no matter before switching or during and after switching, and the data transmission is ensured not to be lost.
Drawings
FIG. 1 is a schematic diagram of an inter-satellite handoff application scenario for a low-orbit satellite system according to the present invention;
FIG. 2 is a flow chart of an inter-satellite handoff service for a low-orbit satellite system according to the present invention;
fig. 3 is a flow chart of the inter-satellite handoff operation of the low-orbit satellite system of the present invention.
Detailed Description
The specific implementation method of the invention is described as follows:
in order to optimize the influence of high inter-satellite link data transmission pressure of a low-orbit satellite system on the data processing capacity of the inter-satellite base station, and simultaneously ensure that data transmission is not lost, an inter-satellite switching process is designed, and the data forwarding process is placed in the ground access gateway. Fig. 1 is a schematic diagram of an application scenario of inter-satellite handover of a low-orbit satellite system according to the present invention. In order to realize the invention, a low orbit satellite system is provided, which comprises a satellite terminal S-UE, a source satellite-borne base station Src-S-eNB, a target satellite-borne base station Tgt-S-eNB, a ground access gateway S-GW and a core network S-EPC. The ground access gateway controls the data transmission of the satellite-borne base station and the core network, and the data forwarding of the inter-satellite link in the switching process is transferred to the ground access gateway for control. The black solid line shows that the satellite terminal is communicated with the ground gateway through the source satellite-borne base station before switching; the data forwarding process in the handover flows inside the ground access gateway, but not through the inter-satellite link; and the black dotted line shows that the satellite terminal is communicated with the ground gateway through the target satellite-borne base station after being switched.
Fig. 2 is a flow chart of the inter-satellite handoff service of the low-orbit satellite system according to the present invention, comprising the steps of:
(1) The satellite terminal S-UE performs switching judgment, and if the switching type is determined to be inter-satellite switching, a switching result is reported to the source satellite-borne base station Src-S-eNB;
(2) After receiving the switching result, the source satellite-borne base station Src-S-eNB verifies whether the result accords with the relation with the adjacent base station, if so, the context code of the current satellite terminal S-UE is stored, and then a switching request is assembled and sent to the target satellite-borne base station Tgt-S-eNB, and the step (3) is executed; if the target satellite-borne base station Tgt-S-eNB does not accord with the target satellite-borne base station Tgt-S-eNB, the satellite terminal S-UE initiates competitive random access;
(3) After receiving the switching request, the target satellite-borne base station Tgt-S-eNB firstly decodes to obtain a satellite terminal context, then applies for satellite terminal resources, configures an air interface access layer context, sends E1 channel establishment to a ground access gateway S-GW after configuration is completed, and establishes a corresponding data channel at the ground access gateway S-GW;
(4) The target satellite-borne base station Tgt-S-eNB stores the satellite terminal application resources and related configuration codes, assembles a switching request response and sends the switching request response to the source satellite-borne base station Src-S-eNB;
(5) After receiving the switching request response, the source satellite-borne base station Src-S-eNB firstly decodes to obtain relevant configuration parameters of the satellite terminal S-UE in the target satellite-borne base station Tgt-S-eNB, and then assembles an RRC reconfiguration message and sends the RRC reconfiguration message to the satellite terminal S-UE; meanwhile, the Src-S-eNB of the source satellite-borne base station assembles a data forwarding notice and sends the notice to the S-GW of the ground access gateway;
(6) After receiving the data forwarding notification, the ground access gateway S-GW enters a data forwarding state, and forwards downlink data sent by the core network S-EPC to a data channel established by the target satellite-borne base station Tgt-S-eNB and the ground access gateway S-GW for caching; meanwhile, after receiving RRC reconfiguration information of a source satellite-borne base station Src-S-eNB, the satellite terminal S-UE configures each layer according to designated parameters of a target satellite-borne base station Tgt-S-eNB, initiates non-competitive random access to the target satellite-borne base station Tgt-S-eNB, and sends RRC reconfiguration completion information to the target satellite-borne base station Tgt-S-eNB after attachment is completed, and then step (7) is executed; if the satellite terminal S-UE fails to configure each layer, the satellite terminal S-UE initiates competitive random access and reattaches to the target satellite-borne base station Tgt-S-eNB;
(7) After receiving the RRC reconfiguration completion message of the satellite terminal S-UE, the target satellite-borne base station Tgt-S-eNB sends a path switching request message to the ground access gateway S-GW;
(8) After receiving the path switching request message, the ground access gateway S-GW firstly transmits the data cached in the data channel to the satellite terminal S-UE through the target satellite-borne base station Tgt-S-eNB, and then transmits the path switching request to the core network S-EPC;
(9) After receiving the path switching request message, the core network S-EPC switches the downlink data anchor point from the source satellite-borne base station Src-S-eNB to the target satellite-borne base station Tgt-S-eNB, and then sends a path switching request response to the target satellite-borne base station Tgt-S-eNB through the ground access gateway S-GW;
(10) After receiving the path switching request response, the target satellite-borne base station Tgt-S-eNB assembles a satellite terminal context release message and sends the context release message to the source satellite-borne base station Src-S-eNB;
(11) And after the source satellite-borne base station Src-S-eNB receives the release of the context of the satellite terminal, releasing the context of the satellite terminal and configuration of each layer, and completing inter-satellite switching.
Fig. 3 is a flow chart of the inter-satellite handoff operation of the low-orbit satellite system of the present invention. The ground access gateway controls the data transmission of the satellite-borne base station and the core network, and the data forwarding of the inter-satellite link in the switching process is transferred to the ground access gateway for control.
The embodiments of the present invention create a network element deployment and signaling design method for inter-satellite handover in a low-orbit satellite system, and in particular, the embodiments are suitable for a low-orbit satellite system, and can effectively reduce the pressure of the data transmission task of the inter-satellite link, reduce the design complexity of the inter-satellite link, and ensure that the data transmission is not lost.
Claims (1)
1. The inter-satellite switching method of the low-orbit satellite system is realized based on the low-orbit satellite system consisting of a satellite terminal, a source satellite-borne base station, a target satellite-borne base station, a ground access gateway and a core network; the method is characterized by comprising the following steps of:
(1) The satellite terminal performs switching judgment, and if the switching type is determined to be inter-satellite switching, the switching result is reported to the source satellite-borne base station;
(2) After the source satellite-borne base station receives the switching result, verifying whether the result accords with the relation with the adjacent base station, if so, storing the context code of the current satellite terminal, then assembling the switching request and sending the switching request to the target satellite-borne base station, and executing the step (3); if the satellite terminal does not accord with the target satellite-borne base station, the satellite terminal initiates competitive random access and reattaches to the target satellite-borne base station;
(3) After receiving the switching request, the target satellite-borne base station firstly decodes to obtain the context of the satellite terminal, then applies for satellite terminal resources, configures the context of the air interface access layer, sends E1 channel establishment to the ground access gateway after configuration is completed, and establishes a corresponding data channel at the ground access gateway;
(4) The target satellite-borne base station applies for resources and relevant configuration codes of the satellite terminal to store, assembles a switching request response and sends the switching request response to the source satellite-borne base station;
(5) After receiving the switching request response, the source satellite-borne base station firstly decodes to obtain relevant configuration parameters of the satellite terminal at the target satellite-borne base station, and then assembles an RRC reconfiguration message and sends the RRC reconfiguration message to the satellite terminal; meanwhile, the source satellite-borne base station assembles a data forwarding notice and sends the notice to the ground access gateway;
(6) After receiving the data forwarding notification, the ground access gateway enters a data forwarding state, and forwards downlink data sent by the core network to a data channel established by the target satellite-borne base station and the ground access network for caching; meanwhile, after receiving the RRC reconfiguration message of the source satellite-borne base station, the satellite terminal configures each layer according to the appointed parameters of the target satellite-borne base station, initiates non-competitive random access to the target satellite-borne base station, and after the attachment is completed, sends an RRC reconfiguration completion message to the target satellite-borne base station, and then the step (7) is executed; if the satellite terminal fails to configure each layer, the satellite terminal initiates competitive random access and reattaches to the target satellite-borne base station;
(7) After receiving the RRC reconfiguration completion message of the satellite terminal, the target satellite-borne base station sends a path switching request message to the ground access gateway;
(8) After receiving the path switching request message, the ground access gateway firstly transmits the data cached in the data channel to the satellite terminal through the target satellite-borne base station, and then transmits the path switching request to the core network;
(9) After receiving the path switching request message, the core network switches the downlink data anchor point from the source satellite-borne base station to the target satellite-borne base station, and then sends a path switching request response to the target satellite-borne base station through the ground access gateway;
(10) After receiving the path switching request response, the target satellite-borne base station assembles a context release message of the satellite terminal and sends the context release message to the source satellite-borne base station;
(11) And after the source satellite-borne base station receives the release of the context of the satellite terminal, releasing the context of the satellite terminal and configuration of each layer, and completing inter-satellite switching.
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| CN114785399B (en) * | 2022-03-22 | 2024-03-29 | 南京熊猫汉达科技有限公司 | End-to-end communication method of low-orbit satellite communication network system |
| CN115314102B (en) * | 2022-09-29 | 2022-12-27 | 中国电子科技集团公司第五十四研究所 | Mobile switching management method suitable for multi-satellite networking |
| CN115474253B (en) * | 2022-11-07 | 2023-02-07 | 中国电子科技集团公司第五十四研究所 | Satellite network user cross-satellite cross-beam seamless mobile switching method |
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