CN116155366B - High-flux satellite system route addressing method based on software defined network - Google Patents
High-flux satellite system route addressing method based on software defined network Download PDFInfo
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- CN116155366B CN116155366B CN202310391993.9A CN202310391993A CN116155366B CN 116155366 B CN116155366 B CN 116155366B CN 202310391993 A CN202310391993 A CN 202310391993A CN 116155366 B CN116155366 B CN 116155366B
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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
- H04B7/18517—Transmission equipment in earth stations
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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
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/12—Discovery or management of network topologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a high-flux satellite system route addressing method based on a software defined network. It relates to high flux satellite network technology in satellite communication field. The invention designs a route addressing exchange method based on software definition with high coupling between service exchange and carrier allocation aiming at the characteristics of massive user access, multi-gateway station landing and multi-spot beam networking of a high-flux satellite communication system, and a control plane automatically generates a satellite network topology mapping table by a satellite network SDN controller through a satellite link layer discovery protocol, interaction of carrier allocation information with a network manager and the like; the service plane utilizes SDN switch to realize service exchange between stations, greatly simplifies the work of satellite terminals of gateway stations, and meets the requirement of exchanging and forwarding massive data of users. By adopting the mode, the network configuration of the system can be greatly simplified, the network elastic adjustment capability is improved, and the capacity and exchange capability of the system are improved.
Description
Technical Field
The invention belongs to the field of satellite communication, and discloses a Software Defined Network (SDN) based high-flux satellite system routing addressing method which is particularly suitable for a high-flux satellite ground system network based on transparent forwarding of high-orbit multipoint beams.
Background
The high-flux satellite communication system has the excellent characteristics of large communication capacity, multi-point wave beams, high wave beam gain, low resource and the like, is widely applied internationally as one of main development trends of next-generation satellite communication, and plays an increasingly large role in the aspects of network coverage extension, backbone network backup, coverage of remote areas, emergency communication guarantee and the like.
At present, the network architecture of the high-throughput satellite communication system of each satellite communication company mainly adopts a star-shaped architecture, and relies on gateway stations as centers for information exchange and forwarding between a ground network and users under each beam. And because of the multiple spot beams of high throughput satellite systems, it is often necessary to construct multiple gateway stations to meet coverage requirements. The current gateway station mainly adopts a routing switching mode based on the traditional two layers (bridge mode) or the standard three layers (routing mode, generally adopting an OSPF routing protocol), has complex equipment connection, difficult network adjustment and long route re-convergence time, and a mobile user needs to change an IP address when making cross-beam movement among multi-point beams, so that the interruption time is long. And because the high-flux satellite communication system is a star-shaped structure, all data is subjected to ground processing by the gateway station, and the processing capacity of the gateway station satellite terminal becomes the bottleneck of large-scale application of users.
Disclosure of Invention
Aiming at some problems existing in the current route exchange in the high-flux satellite network in the background technology, the invention introduces a technology of a software defined network (SDN for short), and designs a high-flux satellite system route addressing method based on the Software Defined Network (SDN).
The purpose of the invention is realized in the following way:
a high-throughput satellite system routing addressing method based on a Software Defined Network (SDN) is realized based on a satellite communication network formed by a satellite network SDN controller, an SDN switch, a gateway station satellite terminal, a remote station satellite terminal and a network management center, and comprises the following steps:
(1) The satellite network SDN controller and the gateway station satellite terminal interactively complete detection learning of the connection relation between the SDN switch and the gateway station satellite terminal through a satellite link layer discovery protocol (S-LLDP, satellite Link Layer Discovery Protocol);
(2) The network manager distributes the on-duty carrier for the gateway station satellite terminal when the gateway station satellite terminal is in the network, and distributes the service front/return carrier for the remote station satellite terminal when the remote station satellite terminal is in the network. The network management center forms a corresponding relation between a receiving and transmitting carrier wave and a remote station satellite terminal and between a gateway station satellite terminal according to the distribution condition of a forward/backward carrier wave when the terminal is connected to the network, and informs a satellite network SDN controller of the mapping relation;
(3) After the remote station is connected to the network, if the terminal is in a routing mode, reporting a terminal IP address, downlink network routing information, a remote station satellite terminal number and the like to a satellite network SDN controller; if the terminal is in the bridge mode, reporting a terminal IP address, a downlink mac address, a remote station satellite terminal number and the like to a satellite network SDN controller;
(4) The satellite network SDN controller analyzes the information reported in the step (1), the step (2) and the step (3) through summarization to finally form[SDN switch ID, port I gateway station satellite terminal number I remote station IP address I down-hang IP address/MAC address]A complete network topology mapping table of (a);
(5) The satellite network SDN controller configures SDN switch according to the network topological relation[SDN switch ID, port I out port]A network topology mapping table is issued to a remote station satellite terminal;
(6) The remote station satellite terminal receives the IP data, searches a network topology mapping table, obtains the remote station satellite terminal number where the destination IP (routing mode)/destination MAC (bridge mode) is located, SDN switch ID and port number, and encapsulates relevant information into original IP data;
(7) The gateway station satellite terminal receives the IP data of the remote station satellite terminal and only needs to send the IP data to the connected SDN switch without any processing judgment;
(8) The SDN switch searches a flow table for forwarding according to the ID and the port number of the target SDN switch encapsulated in the data; if the data is the data of the cross-gateway station, the data is packaged in a tunnel;
(9) The satellite terminal of the gateway station receives the service data sent by the SDN switch, searches the number of the destination terminal encapsulated in the packet, and sends the data to the destination remote station;
(10) The destination remote station recovers the original data and sends the data to the final destination.
The satellite link layer discovery protocol (S-LLDP, satellite Link Layer Discovery Protocol) in the step (1) is an improvement based on the LLDP protocol, and specific information in satellite networks such as satellite terminal numbers is added. Finally forming as[SDN switch ID, port I gateway station satellite terminal number]Is connected with (a)Relationship.
Wherein, the gateway station satellite terminal in the step (2) allocates the guard carrier for the gateway station satellite terminal when accessing the network, for example, the guard carrier allocated for the gateway station satellite terminal is a forward carrier. When the remote station satellite terminal is connected to the network, the network manager can allocate a forward carrier for the remote station satellite terminal, for example, the forward carrier allocated for the remote station satellite terminal, that is, the service data sent to the remote station satellite terminal can be sent to the remote station satellite terminal through the guard forward carrier of the gateway station satellite terminal. The corresponding relation between the receiving and transmitting carrier wave, the remote station satellite terminal and the gateway station satellite terminal can be informed to the satellite network SDN controller by a network manager, and the remote station can report the route information and carry the satellite terminal number of the gateway station to which the remote station belongs.
The SDN switch in the step (5) may be a commercial SDN switch or an OVS soft switch.
The data encapsulation in the step (6) may be encapsulation of the relevant information into an MPLS header, or may use other fields.
The tunnel encapsulation in the step (8) includes, but is not limited to, vxLAN tunnel, and GRE tunnel.
Compared with the routing addressing mode in the existing high-flux satellite communication system, the invention has the following advantages:
the control plane automatically forms a satellite network topology mapping table by a satellite network SDN controller through a satellite link layer discovery protocol, interaction carrier allocation information with a network manager and active reporting of IP or MAC information by a remote station terminal by adopting a control and forwarding separation mode; the service plane adopts SDN switch to realize service exchange between stations, greatly simplifies the work of satellite terminals of gateway stations, and meets the requirement of exchanging and forwarding a large amount of user data. The network topological relation is automatically generated, and the network can be dynamically converged without manual intervention when a user is newly added; by adopting the mode, the network configuration of the system is greatly simplified, the network elastic networking capability is improved, and the capacity and the exchange capability of the system are improved.
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FIG. 1 is a schematic diagram of a system architecture of the present invention;
fig. 2 is a flow chart of an embodiment of the present invention.
Detailed Description
In order to implement the invention, a further description is given below with reference to fig. 1 and 2. Fig. 1 is a schematic diagram of a system architecture of the present invention, and fig. 2 is a flowchart of an embodiment of the present invention.
Referring to fig. 1, an application scenario of a Software Defined Network (SDN) based high throughput satellite system routing addressing method is mainly illustrated. The scene mainly comprises a satellite network SDN controller, an SDN switch, a gateway station satellite terminal, a remote station satellite terminal and a network management center. The satellite network SDN controller is connected with the SDN switch and the network management center through the management network port, the network management center and the satellite terminal interact information through the management bus, the SDN switch is directly connected with the satellite terminal of the gateway station through the service network port, and the satellite terminal of the gateway station is connected with the satellite terminal of the remote station through the satellite channel.
Referring to fig. 2, a flow of implementing a high throughput satellite system routing method based on a Software Defined Network (SDN) is mainly illustrated, and implemented based on a satellite communication network formed by a satellite network SDN controller, an SDN switch, a gateway satellite terminal, a remote station satellite terminal and a network management center, and is characterized by comprising the following steps:
(1) The satellite network SDN controller and the gateway station satellite terminal interactively complete detection learning of the connection relation between the SDN switch and the gateway station satellite terminal through a satellite link layer discovery protocol (S-LLDP, satellite Link Layer Discovery Protocol);
(2) The network manager distributes the on-duty carrier for the gateway station satellite terminal when the gateway station satellite terminal is in the network, and distributes the service front/return carrier for the remote station satellite terminal when the remote station satellite terminal is in the network. The network management center forms a corresponding relation between a receiving and transmitting carrier wave and a remote station satellite terminal and between a gateway station satellite terminal according to the distribution condition of a forward/backward carrier wave when the terminal is connected to the network, and informs a satellite network SDN controller of the mapping relation;
(3) After the remote station is connected to the network, if the terminal is in a routing mode, reporting a terminal IP address, downlink network routing information, a remote station satellite terminal number and the like to a satellite network SDN controller; if the terminal is in the bridge mode, reporting a terminal IP address, a downlink mac address, a remote station satellite terminal number and the like to a satellite network SDN controller;
(4) The satellite network SDN controller analyzes the information reported in the step (1), the step (2) and the step (3) through summarization to finally form[SDN switch ID, port I gateway station satellite terminal number I remote station IP address I down-hang IP address/MAC address]A complete network topology mapping table of (a);
(5) The satellite network SDN controller configures SDN switch according to the network topological relation[SDN switch ID, port I out port]A network topology mapping table is issued to a remote station satellite terminal;
(6) The remote station satellite terminal receives the IP data, searches a network topology mapping table, obtains the remote station satellite terminal number where the destination IP (routing mode)/destination MAC (bridge mode) is located, SDN switch ID and port number, and encapsulates relevant information into original IP data;
(7) The gateway station satellite terminal receives the IP data of the remote station satellite terminal and only needs to send the IP data to the connected SDN switch without any processing judgment;
(8) The SDN switch searches a flow table for forwarding according to the ID and the port number of the target SDN switch encapsulated in the data; if the data is the data of the cross-gateway station, the data is packaged in a tunnel;
(9) The satellite terminal of the gateway station receives the service data sent by the SDN switch, searches the number of the destination terminal encapsulated in the packet, and sends the data to the destination remote station;
(10) The destination remote station recovers the original data and sends the data to the final destination.
The satellite link layer discovery protocol (S-LLDP, satellite Link Layer Discovery Protocol) in the step (1) is an improvement based on the LLDP protocol, and specific information in satellite networks such as satellite terminal numbers is added. Finally forming as[SDN switch ID, port I gateway station satellite terminal number]Is a connection relation of the above.
Wherein, the gateway station satellite terminal in the step (2) allocates an attended carrier for the gateway station satellite terminal when accessing the network, for example, the attended carrier allocated for the gateway station satellite terminal 1 is a forward carrier 1. When the remote station satellite terminal is connected to the network, the network manager allocates a forward carrier to the remote station satellite terminal, for example, the forward carrier 1 allocated to the remote station satellite terminal 1, that is, the service data sent to the remote station satellite terminal 1 is sent to the remote station satellite terminal 1 through the forward carrier 1 attended by the gateway station satellite terminal 1. The corresponding relation between the receiving and transmitting carrier wave, the remote station satellite terminal and the gateway station satellite terminal can be informed to the satellite network SDN controller by a network manager, and the remote station can report the route information and carry the satellite terminal number of the gateway station to which the remote station belongs.
The SDN switch in the step (5) may be a commercial SDN switch or an OVS soft switch.
The data encapsulation in the step (6) may be encapsulation of the relevant information into an MPLS header, or may use other fields.
The tunnel encapsulation in the step (8) includes, but is not limited to, vxLAN tunnel, and GRE tunnel.
According to the embodiments of the invention, SDN technology is introduced into a high-throughput satellite network, the embodiment adopts a control and forwarding separation mode, and a control plane automatically forms a satellite network topology mapping table through a satellite link layer discovery protocol, interaction carrier allocation information with a network manager and the like by a satellite network SDN controller; the service plane adopts SDN switch to realize service exchange between stations, greatly simplifies the work of the satellite terminal of the gateway station, and can greatly improve the system capacity of the high-flux satellite network and the transmission performance of the service.
Those of ordinary skill in the art will appreciate that: implementing a Software Defined Network (SDN) based high throughput satellite system routing method may be accomplished by hardware or software associated with program instructions that, when executed, perform steps comprising the method embodiments described above.
Claims (4)
1. The high-throughput satellite system routing addressing method based on the software defined network is realized based on a satellite communication network formed by a satellite network SDN controller, an SDN switch, a gateway station satellite terminal, a remote station satellite terminal and a network management center, and is characterized by comprising the following steps:
(1) The satellite network SDN controller and the gateway station satellite terminal interactively complete detection learning of the connection relation between the SDN switch and the gateway station satellite terminal through a satellite link layer discovery protocol; wherein the satellite link layer discovery protocol is improved based on LLDP protocol, and specific information in satellite network of satellite terminal number is added to finally form[SDN switch ID, port I gateway station satellite terminal number]Is a connection relation of (a);
(2) The network manager distributes the on-duty carrier for the gateway station satellite terminal when the gateway station satellite terminal is in the network, and distributes the service front/return carrier for the remote station satellite terminal when the remote station satellite terminal is in the network; the network management center forms a corresponding relation between a receiving and transmitting carrier wave and a remote station satellite terminal and between a gateway station satellite terminal according to the distribution condition of a forward/backward carrier wave when the terminal is connected to the network, and informs a satellite network SDN controller of the mapping relation; the gateway station satellite terminal distributes the on-duty carrier for the gateway station satellite terminal when the gateway station satellite terminal is connected to the network, and specifically comprises: the attended carrier wave distributed by the satellite terminal of the gateway station is a forward carrier wave; when a remote station satellite terminal is accessed to the network, a network manager can allocate forward carriers for the remote station satellite terminal, specifically: the remote station satellite terminal distributes forward carrier, namely the service data sent to the remote station satellite terminal is sent to the remote station satellite terminal through the guard forward carrier of the gateway station satellite terminal; the corresponding relation is informed to a satellite network SDN controller by a network manager or the remote station reports the route information and carries the satellite terminal number of the gateway station to which the remote station belongs;
(3) After the remote station is connected to the network, if the terminal is in a routing mode, reporting a terminal IP address, downlink network routing information and a remote station satellite terminal number to a satellite network SDN controller; if the terminal is in the bridge mode, reporting a terminal IP address, a downlink mac address and a remote station satellite terminal number to a satellite network SDN controller;
(4) Analyzing the steps (1), the steps (2) and the steps by the satellite network SDN controllerThe information reported in the step (3) is finally formed[SDN switch ID, port I gateway station satellite terminal number I remote station IP address I down-hang IP address/MAC address]A complete network topology mapping table of (a);
(5) The satellite network SDN controller configures SDN switch according to the network topological relation[SDN switch ID, port I out port]A network topology mapping table is issued to a remote station satellite terminal;
(6) The remote station satellite terminal receives the IP data, searches a network topology mapping table, obtains the remote station satellite terminal number where the target IP/target MAC is located, the SDN switch ID and the port number, and encapsulates relevant information into original IP data;
(7) The gateway station satellite terminal receives the IP data of the remote station satellite terminal, and only r is required to be sent to the connected SDN switch without any processing judgment;
(8) The SDN switch searches a flow table for forwarding according to the ID port number of the target SDN switch encapsulated in the data; if the data is the data of the cross-gateway station, the data is packaged in a tunnel;
(9) The satellite terminal of the gateway station receives the service data sent by the SDN switch, searches the number of the destination terminal encapsulated in the packet, and sends the data to the destination remote station;
(10) The destination remote station recovers the original data and sends the data to the final destination.
2. A software defined network based high throughput satellite system routing method according to claim 1, wherein: the SDN switch in the step (5) is a commercial SDN switch or an OVS soft switch.
3. A software defined network based high throughput satellite system routing method according to claim 1, wherein: the data encapsulation in the step (6) is encapsulation of the relevant information into an MPLS header.
4. A software defined network based high throughput satellite system routing method according to claim 1, wherein: the tunnel encapsulation in the step (8) includes a VxLAN tunnel and a GRE tunnel.
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