CN110519146A - Service protecting method and controller based on air-ground integrated annular link structure - Google Patents

Abstract

The invention discloses a kind of service protecting methods and controller based on air-ground integrated annular link structure; the described method includes: being head and the tail optical node S, D of optical fiber link to be protected; accessible Liang Ge earth station S ', D ' are selected respectively, and then select two accessible satellite L_S、L_D；Determine spatial light link road by P (L_S→L_D) after, construct S → S ' → L_S→P(L_S→L_D)→L_DThe annular link structure of → D ' → D → S；In optical fiber link failure or D → D ' → L of S → D_D→P(L_D→L_S)→L_SWhen the upper any one link of → S ' → S surprisingly fails, service protection is carried out using the ring light link structure.Using the present invention with can making between local face optical fiber link, star optical link or star optical link failure when be able to carry out service loop operation so that service fast protection.

Description

Service protection method and controller based on air-ground integrated ring link structure

technical field

The invention relates to the field of air-ground integrated optical network technology, in particular to a service protection method and controller based on an air-ground integrated ring link structure.

Background technique

Frequent natural disasters and man-made damage have seriously affected the normal operation of optical networks, and it is urgent to design survivability solutions with high survivability. However, the existing survivability technologies mainly rely on the optical network itself to recover services in disaster scenarios, and the improvement of network invulnerability is limited. With the development of satellite communications, it has become a new idea to use satellite networks to improve the invulnerability of ground optical networks. Since the satellite is located in a space area of more than 400 kilometers, it is usually not affected by various natural disasters on the ground. Therefore, the satellite network and the ground optical network are independent of disasters. Using the satellite network to protect and restore the ground optical network business can achieve a real sense of security. invulnerable. However, the satellite network based on radio frequency communication and the ground optical network adopt different transmission systems and protocols, and the transmission rate, delay, transmission protocol, physical damage, etc. are completely different. If coordinated protection and restoration is to be carried out, complex signals, codes, etc. are required. Speed, protocol conversion, complex operation, and low implementation efficiency. Since the space optical network adopts the same transmission system as the terrestrial optical network, it can directly perform fast switching of services and is easy to operate. Therefore, it is an inevitable choice to use the space optical network for the collaborative survivability design of the terrestrial optical network. With the continuous integration of space optical network and terrestrial optical network, space-ground integrated optical network will become the core high-speed and large-capacity transmission network in the future. For the space-ground integrated optical network composed of space optical network and terrestrial optical network, there is no effective survivability solution at present.

Contents of the invention

In view of this, the object of the present invention is to propose a service protection method and controller based on an air-ground integrated ring link structure, so that when the ground optical fiber link, inter-satellite optical link or star-ground optical link fails The business loopback operation can solve the business protection problem of the terrestrial optical fiber link in disaster scenarios, and can also realize the rapid protection of the business when the inter-satellite optical link and the satellite-ground optical link fail.

Based on the above purpose, the present invention provides a service protection method based on an air-ground integrated ring link structure, including:

For the first and last optical nodes S and D of the optical fiber link to be protected, respectively select two ground stations S' and D' that can be accessed, and select two ground stations S' and D' that can be accessed satellites L _S , _LD ;

Determine the space optical connection route P(L _S → L _D ) from the satellite L _S to L _D ;

Configure S, D, S', D' and each satellite that P(L _S → L _D ) passes through to form S → S' → L _S → P(L _S → L _D ) → L _D → D' →D→S ring link structure;

When the optical fiber link of S → D fails or any link on D → D' → L _D → P( _LD → L _S ) → L _S → S' → S fails unexpectedly, the ring optical link is used structure for business protection.

Wherein, the first and last optical nodes S and D of the optical fiber link to be protected are respectively selected as two ground stations S' and D' that can be accessed, specifically including:

For the optical nodes S and D, respectively select the two nearest ground stations S' and D' that are not in the same shared disaster risk area.

Wherein, the selection of two accessible satellites L _S and L _D for the two ground stations S' and D' respectively includes:

For each selected ground station, if there are multiple accessible LEO satellites for the ground station, the LEO satellite with the current maximum access duration is taken as the satellite selected for the ground station.

Wherein, the determination of the spatial optical connection route P( _LS → L _D ) from the satellite _LS to _LD specifically includes:

Add satellites L _S and _LD to satellite set V;

For each satellite in V, add to V the LEO satellites, MEO satellites, and GEO satellites that are accessible to that satellite, until no satellites can be added to the set V; and

Add the laser links between the satellites in the set V to the laser link set E to form the space segment real-time network topology G(V,E);

After deleting the laser link whose idle spectrum resource is less than the preset bandwidth value from G(V,E), use the shortest path algorithm to calculate a space optical connection route P(L _S → L _D from the satellite L _S to L _D ).

Further, the method also includes:

Before the ring optical link structure fails, re-select two accessible satellites L _S ', L _D ' for the two ground stations S', D'respectively;

Determine the spatial optical connection route P(L _S ′→ _LD ′) from the satellite L _S ′ to _LD ′;

Configure each satellite that S, D, S', D' and P(L _S ′→L _D ′) pass through to form S→S'→L _S ′→P(L _S ′→L _D ′)→ L _D '→D'→D→S new ring link structure.

The present invention also provides a controller, including:

The ground station selection module is used to select two accessible ground stations S' and D' respectively for the first and last optical nodes S and D of the optical fiber link to be protected;

a satellite selection module, configured to select two accessible satellites L _S and L _D for the two ground stations S' and D'respectively;

A space optical connection route determination module, used to determine the space optical connection route P(L _S → L _D ) from the satellite L _S to L _D ;

The ring link structure configuration module is used to configure each satellite that S, D, S', D' and P(L _S → L _D ) pass through to form S → S' → L _S → P(L _S → L _D )→ _LD →D'→D→S ring link structure; and send the ring link structure to each node in the ring link structure, so that the optical fiber chain in S→D When a link fails or any link on D→ _D '→LD→P( _LD →L _S )→L _S →S'→S fails unexpectedly, the nodes involved in the faulty link or the unexpectedly failed link can use The ring optical link structure implements service protection.

Further, the controller also includes:

A ring link structure updating module, configured to send a satellite selection notification to the satellite selection module before the current ring link structure fails; and

The satellite selection module is also used to reselect two accessible satellites L _S ′, L _D ′ for the two ground stations S′, D′ respectively after receiving the satellite selection notification, and send The spatial optical connection routing determination module sends a routing determination notification; and

The spatial optical connection routing determination module is also used to determine the spatial optical connection route P( _LS ′→ _LD ′) from the satellite L _S ′ to _LD ′ after receiving the routing determination notification; The ring structure configuration module sends a link structure configuration notification; and

The ring link structure configuration module is also used for performing each satellite passing by S, D, S', D' and P (L _S '→L _D ') after receiving the link structure configuration notification Configuration, forming a new ring link structure of S→S'→L _S ′→P(L _S ′→L _D ′)→L _D ′→D'→D→S; and the new ring link structure Issued to each node in the new ring link structure, so that the fiber link at S→D fails or D→ _D '→LD ′→P( _LD ′→L _S ′)→L _S ′ →S'→When any link on S unexpectedly fails, the failed link or the nodes involved in the unexpectedly failed link can utilize the ring optical link structure for service protection.

The technical solution of the present invention provides a service protection method based on an air-ground integrated ring link structure. For the first and last optical nodes S and D of the optical fiber link to be protected, ground stations S', D' and accessible Satellite L _S , L _D , after determining the space optical connection route P(L _S → _LD ) from satellite L _S to L _D , construct S→S'→L _S →P(L _S →L _D )→L _D →D'→D→S ring link structure; when the ground optical fiber link fails or the inter-satellite and star-ground links fail unexpectedly, the working business will be directly switched to the ring link structure , it can protect the business protection of the ground optical fiber link in disaster scenarios, and also realize the fast protection of the business when the inter-satellite optical link and the satellite-ground optical link fail, so as to realize the true anti-destruction;

Moreover, since the optical connections between the satellites and the satellites in the ring link structure of the present invention mainly carry out the transmission of service data through laser signals, therefore, the optical signals in the optical fiber links on the ground do not need to carry out complicated signal processing. , protocol, rate, etc., you can use the inter-satellite and inter-satellite optical connections in the ring link structure to quickly protect services.

Description of drawings

FIG. 1 is a flowchart of a service protection method based on an air-ground integrated ring link structure provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of the structure of the space-ground integrated optical network composed of the optical network of the space segment and the ground segment provided by the embodiment of the present invention;

FIG. 3 is a schematic diagram of selecting an accessible ground station for an optical node provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of selecting two accessible satellites for a ground station according to an embodiment of the present invention;

FIG. 5 is a flow chart of a method for determining a spatial optical connection route from a satellite _LS to _LD provided by an embodiment of the present invention;

6 is a schematic diagram of a space segment real-time network topology G(V, E) provided by an embodiment of the present invention;

7 is a schematic diagram of the configuration of nodes in the ring link structure provided by the embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a constructed ring link provided by an embodiment of the present invention;

FIG. 9 is a schematic diagram of a loopback connection inside an optical node when an optical fiber link fails according to an embodiment of the present invention;

Fig. 10 is a block diagram of an internal structure of a service protection device based on an air-ground integrated ring link structure provided in a controller according to an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Additionally, "connected" or "coupled" as used herein may include wireless connection or wireless coupling. The expression "and/or" used herein includes all or any elements and all combinations of one or more associated listed items.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

The service protection method based on the air-ground integrated ring link structure proposed by the present invention is a ring-shaped protection method for the air-ground integrated optical network, which mainly uses the optical network of the space segment and the optical network of the ground segment to form a And the ring protection structure of the space segment, in the disaster scenario, the data of the ground optical fiber link is switched to the space optical link for transmission, without complicated conversion of signals, protocols, rates, etc., and the operation is simple.

The technical solutions of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

A service protection method based on an air-ground integrated ring link structure provided by an embodiment of the present invention, the process flow is shown in Figure 1, including the following steps:

Step S101: For the first and last optical nodes S and D of the optical fiber link to be protected, respectively select two ground stations S' and D' that can be accessed.

Specifically, the optical fiber link to be protected can be selected according to the requirement of invulnerability and the importance of the optical fiber. Since it takes a lot of manpower and material resources to launch satellites, build ground stations, and build space optical networks, compared with ground optical networks, the bandwidth cost of space optical networks is relatively high, so it is necessary to choose the required one according to the requirements of survivability and the importance of optical fibers. Protected terrestrial fiber optic links. Optical fiber links with frequent disasters and high communication importance are usually selected for protection, such as transoceanic submarine optical cables. Because transoceanic submarine optical cables often carry information transmission between different countries, the service level is high, and the importance of optical cables is great. At the same time, the distance of transoceanic submarine optical cables is long and the geographical environment is complex, which is prone to various failures.

The technical scheme of the invention can provide protection for all services in the optical fiber link to be protected, and can also provide protection for only some important services. It is assumed here that the optical fiber link to be protected is S-D, the bandwidth of the service to be protected is Bbit/s, the transmission direction is S→D, and S and D are the optical nodes at both ends of the optical fiber link to be protected. In fact, the network manager can determine the bandwidth of the service to be protected according to the actual situation.

In this step, for the first and last optical nodes S and D of the optical fiber link to be protected, the two closest ground stations S' and D' that are not in the same shared disaster risk area can be selected respectively. Specifically, according to the position of the optical fiber link to be protected, suitable ground stations can be selected for the optical nodes at both ends of the optical fiber link to be protected as the transition between the optical network of the space segment of the ring protection structure and the optical network of the ground segment As shown in Figure 2, the space-ground integrated optical network consists of the optical network of the space segment (or space optical network) and the optical network of the ground segment (or ground optical network), and the space optical network communicates with the ground optical network through the ground station. The network is interconnected. The space optical network consists of low earth orbit (LEO) satellites, medium earth orbit (MEO) satellites, high earth orbit (GEO) satellites, and inter-satellite optical links. The information transmission between the space optical network and the ground optical network needs to be transferred through the ground station, and each ground station is responsible for interconnecting with the visible LEO satellites. The selection of the ground station is an extremely complicated issue, and factors such as the location of the ground station and the local climate need to be considered. For example, two factors can be considered, one is the location of the first and last optical node of the optical fiber link to be protected and the location of the ground station, and the other is that the ground station and the optical fiber link to be protected are not in the same shared disaster risk area. Due to the large delay of information propagation in the space optical network, in order to avoid further increase in transmission delay, the nearest ground station is selected as the transition point between the space optical network and the ground optical network for the first and last optical nodes of the optical fiber link to be protected. Since the equipment located in the same shared disaster risk area is affected by the disaster at the same time, in order to avoid simultaneous failure of the optical fiber link to be protected and the ground station, the ground station located in the same shared disaster risk area as the optical fiber link to be protected cannot be selected As a transition point between the space segment and the ground segment. For example, in Fig. 3, the ground station marked as the connection of the optical node S is S', and S' is the ground station closest to the optical node S that is not in the same shared disaster risk area as the optical node S; The ground station selected by the node D to be connected is D', and D' is the ground station nearest to the optical node D that is not in the same shared disaster risk area as the optical node D.

Step S102: Select two accessible satellites L _S , LD for the above two ground stations S', _D ' respectively.

In this step, for each selected ground station, if there are multiple accessible low-earth orbit LEO satellites in the ground station, the LEO satellite with the current maximum access duration is selected as the ground station. satellite.

Specifically, since satellites move in circles around the earth, for each ground station, the satellites that can be accessed in different time periods are different, and the time period for each satellite access is also different, so it is necessary to real-time Location selects available satellites. Due to the relative movement between satellites and between satellites and the earth, some inter-satellite optical links and satellite-to-earth optical links fail due to relative position changes, so the ring link structure in the technical solution of the present invention also has certain survivability. time. In order to make the established ring link structure have a longer lifetime, when selecting an accessible LEO satellite for the ground station, if there are multiple accessible LEO satellites, select the LEO satellite with the current maximum access duration as much as possible. Time for LEO satellites. In this case, LEO(S') is defined as all accessible LEO satellites of ground station S', and LEO(D') is defined as all accessible LEO satellites of ground station D'. For each LEO satellite L∈LEO(S'), calculate the sustainable access time T(L,S') of L and ground station S', for example, as shown in Figure 4, calculate the LEO1, LEO2, LEO3 The sustainable access time is T ₁ , T ₂ , T ₃ , then select the LEO satellite with the current maximum access duration, that is, LEO3 with a continuous access time of T ₃ , marked as L _S as the access of the ground station S' For LEO satellites, T(L _S ,S') has a maximum value at this time. Similarly, the LEO satellite with the longest access duration selected for the ground station D' is marked as L _D as the access LEO satellite of the ground station D'.

Step S103: Determine the spatial optical connection route P (L _S → L _D ) from the satellite _LS to _LD .

Specifically, the specific method flow for determining the spatial optical connection route _P ( _LS → _LD ) from the satellite LS to _LD , as shown in Figure 5, may include the following sub-steps:

Sub-step S501: Add satellites L _S and _LD to satellite set V.

Specifically, for accessing LEO satellites LS and LD, the same-orbit LEO satellites, medium-orbit _MEO satellites, and _GEO satellites that it can connect to also change with time, and need to be determined in real time according to the relative position . Mark the real-time network topology of the air-ground integrated optical network space segment as G(V,E), where V represents the satellite set, E represents the laser link set, and both V and E are initialized as empty sets; in this sub-step, LEO satellites will be connected _LS and _LD are added to the set V.

Sub-step S502: For each satellite in V, add the LEO satellites, MEO satellites and GEO satellites that can be accessed to the satellite into V until no satellite can be added to the set V; The laser links between are added to the laser link set E to form a space segment real-time network topology G(V,E).

Specifically, according to the real-time positions of the accessing LEO satellites _LS and LD, determine the _LEO satellites, _MEO satellites and GEO satellites that can be connected to _LS or LD, and add them to V, and add the corresponding laser links to In the laser link set E. In the same way, for each satellite newly added to V, select the LEO satellite, MEO satellite and GEO satellite it can connect to, and add these selected satellites to V, and add the corresponding laser link to the laser In the link set E, and so on, until no satellite can be added to the set V, so as to complete the construction of the real-time network topology G(V, E) of the space segment of the space-ground integrated optical network. For example, FIG. 6 shows a schematic diagram of a completed space segment real-time network topology G(V,E), which includes 6 LEO satellites, 5 MEO satellites and 1 GEO satellite.

Sub-step S503: After deleting the laser links whose idle spectrum resources are smaller than the preset bandwidth value from G(V,E), use the shortest path algorithm in G(V,E) to calculate a link from the satellite L _S to L _D The spatial optical connection route P(L _S → _LD ).

Specifically, determine the idle spectrum resources of each laser link in the real-time network topology G(V, E) of the air-ground integrated optical network space segment. If the idle spectrum resources of a certain inter-satellite laser link are less than the preset bandwidth value, Then delete the laser link from E. Then use the shortest path algorithm to calculate a spatial optical connection route from LEO satellite L _S to LEO satellite L _D in the updated G(V,E), and reserve a preset bandwidth value on each passing laser link The purpose of using the shortest path algorithm is to minimize the time delay of the spatial path. At this time, the route of the spatial optical connection whose bandwidth is the preset bandwidth value from the LEO satellite LS to the LEO satellite _LD is denoted as P( _LS → L _{D )} .

In the same way, the satellite-ground link between _S ' and LS, and the satellite-ground link between LD and _D ' can also reserve idle spectrum resources with a preset bandwidth value, and between the ground station S' and the ground Port resources with preset bandwidth values are reserved in station D'.

The above preset bandwidth value may be determined according to the bandwidth of the service to be protected in the optical fiber link to be protected, for example, the preset bandwidth value may be set to the bandwidth B bit/s of the service to be protected.

Step S104: Configure each satellite that S, D, S', D' and P(L _S → L _D ) pass through to form S → S' → L _S → P(L _S → L _D ) → L _D →D'→D→S ring link structure.

In this step, each satellite that S, D, _S ', D' and P (LS → L _D ) pass through can be configured: each node configuration from the ring link structure is reserved to the next port resource of a node whose bandwidth is not less than the preset bandwidth value, and sends the route of the ring link structure to each node on the ring link structure. Among them, S→S'→ _{LS→P(L S →} L _D )→ _LD →D'→D→S means from S to S' to L _S , and then through P(L _S →L _D ) to LD to D' to _D and back to S link.

Specifically, since building a ring protection structure needs to occupy the same size of backup spectrum resources and the direction of the ring protection structure is opposite to the direction of the service to be protected, it is necessary to reserve a size of B bit/s and a direction of is the free spectrum resource of D→S. At this time, if the idle spectrum bandwidth in the optical fiber link to be protected is less than B bit/s, on the one hand, the service bandwidth to be protected can be reduced until the idle spectrum resources meet the conditions; on the other hand, it can be reserved from the backup optical fiber link Leave free spectrum bandwidth. It is assumed here that there must be idle spectrum resources of B bit/s in the fiber link to be protected. At present, space laser communication mainly uses wavelength division multiplexing to multiplex optical signals, so resources can be protected and reserved according to the granularity of the wavelength level. Therefore, the B bit/s spectrum resources are transformed into spectrum resources of one or more wavelengths, which can be flexibly determined by the network manager according to the actual situation. Fig. 7 shows the configuration of nodes in the ring link structure. As can be seen from Figure 7, the normal working connection of the optical node S is: the port connected to the optical fiber link to be protected is the outgoing port of the service, and the ring link structure connection configured for the optical node S is: the connection with the ground station S' The connected port is the outgoing port of the service, and the resource bandwidth of the port is not less than the preset bandwidth value;

The normal working connection of optical node D is: the port connected to the optical fiber link to be protected is the incoming port of the service, and the ring link structure connection configured for optical node D is: the port connected to the ground station D' is the incoming port of the service port, and the port resource bandwidth is not less than the preset bandwidth value;

The ring link structure connection configured for the ground station and satellite in the ring link structure is: for the current node, the port connected to the previous node in the ring link structure is the ingress port of the node's business, and the ring link structure The port connected to the next node in the link structure is the outbound port of the service of this node, and the resource bandwidth of the port is not less than the preset bandwidth value.

For example, through satellite control signaling and ground controllers, configure ground station S' and ground station D', optical node D and optical node S, and each satellite that P(L _S → L _D ) passes through for cross-connection Operation, build the ring link structure of S→S'→LS→P(L _S →L _D )→ _LD →D'→D→ _S as shown in Figure 8, the bandwidth of this ring link structure is not less than The preset bandwidth value, for example, the preset bandwidth value is equal to the bandwidth B bit/s of the service to be protected. It is assumed here that the bandwidth from the optical node S to the ground station S' and from the optical node D to the ground station D' is infinite.

Step S105: When the optical fiber link from S→D fails or any link on D→D'→ _LD →P( _LD →LS )→LS→ _S '→ _S fails unexpectedly, use the ring Optical link structure for business protection.

In this step, the optical fiber link to be protected fails in the transmission direction from S to D, that is, when the optical fiber link of _S → _D fails, or, _D →D'→LD →P(LD →LS ) →LS→S'→When any link on S unexpectedly fails, the nodes involved in the failed link or the unexpectedly failed link can utilize the ring optical link structure for service protection.

Among them, P(L _D →L _S ) is the reverse route of P(L _S →L _D ); D→D'→ _LD →P( _LD →L _S )→LS→S'→S means from D to D' to L _D , and then through the link from P ( _LD → L _S ) to L _S to S' to S.

Specifically, when the optical fiber link to be protected fails, and when the inter-satellite optical link or the satellite-ground optical link fails unexpectedly, it can automatically switch to the ring link structure to continue the transmission of business data, thereby quickly protecting the business. The ring link structure whose bandwidth is not less than the preset bandwidth value S→S'→ _{LS→P(L S →} L _D )→L _D →D'→D→S can not only provide optical fiber link S→ Protect services with a bandwidth not less than the preset bandwidth value on D, and at the same time provide bandwidth not less than the preset bandwidth value for any link on _{S'→LS→P(L S →} LD )→ _LD → _D ' protection of. For example, as shown in Figure 9, when the optical fiber link S→D fails, it is only necessary to loop back the incoming port of the service under the normal working connection of the optical node S to the ring link structure connection configured for the optical node S In the same way, the outgoing port of the service under the normal working connection of the optical node D is connected to the incoming port of the service under the ring link structure connection configured for the optical node D, so as to realize the The service on S→D is switched to the path S→ _{S'→LS →P(L S →} LD )→ _LD → _D '→D on the ring link structure to realize the protection of service interruption. Because the ring protection structure constructed by using the space optical network will fail due to the relative movement between the satellites and the satellite and the earth, because it is necessary to rebuild a new ring link structure according to the above process before the ring protection structure is invalidated, so as to ensure any time There is a ring protection structure.

That is to say, before the current ring optical link structure fails, the same method as the above step S102 to step S104 can be used to reselect two accessible satellites for the two ground stations S' and D' respectively Denote as L _S ′, L _D ′; and then determine the space optical connection route P(L _S ′→ _LD ′) from the satellite L _S ′ to _LD ′; for S, D, S', D' and P( _{L S} ′→ _{L D} ′ ₎ is configured for each satellite passing through, _forming a new The ring link structure forms continuous protection of the optical fiber link to be protected.

In fact, in the air-ground integrated optical network, due to the different trajectories and speeds of the communication network nodes, as well as the variability of the space environment, some obstacles block the laser signal, resulting in a highly dynamic satellite-ground collaborative network topology. sexual characteristics. The topology of the satellite-ground collaborative network is the basis for the controller to allocate routing and link resources for services.

Therefore, based on the above-mentioned service protection method based on the air-ground integrated ring link structure, a service protection device based on the air-ground integrated ring link structure provided by the embodiment of the present invention can be set in an air-ground integrated optical network As shown in FIG. 10 , the controller includes the following modules: a ground station selection module 1001 , a satellite selection module 1002 , a spatial optical connection routing determination module 1003 , and a ring link structure configuration module 1004 .

Wherein, the ground station selection module 1001 is used to respectively select two accessible ground stations S', D' for the first and last optical nodes S, D of the optical fiber link to be protected; specifically, the ground station selection module 1001 can be The optical nodes S and D respectively select the two closest ground stations S' and D' that are not in the same shared disaster risk area.

The satellite selection module 1002 is used to select two accessible satellites L _S and LD for the two ground stations S' and _D 'respectively; specifically, the satellite selection module 1002 can, for each selected ground station, in If the ground station has multiple low-earth orbit LEO satellites that can be accessed, the LEO satellite with the current maximum access duration is used as the satellite selected for the ground station.

The spatial optical connection routing determination module 1003 is used to determine the spatial optical connection routing P ( _LS → L _D ) from the satellite L _S to _LD ; specifically, the spatial optical connection routing determination module 1003 can add the satellites L _S and _LD to the satellite set V; and for each satellite in V, add the LEO satellites, MEO satellites and GEO satellites that can be accessed to the satellite into V until no satellite can be added to the set V; and set V The laser links between the satellites are added to the laser link set E to form a space segment real-time network topology G(V,E); after that, the laser links with idle spectrum resources smaller than the preset bandwidth value are transferred from G(V , E) after deletion, use the shortest path algorithm in G(V,E) to calculate a spatial optical connection route P( _LS → L _D ) from satellite L _S to L _D.

The ring link structure configuration module 1004 is used to configure each satellite that S, D, S', D' and P(L _S → L _D ) pass through, forming S → S' → L _S → P(L _S → L _D )→ _LD →D'→D→S ring link structure; and send the ring link structure to each node in the ring link structure, so that the optical fiber chain in S→D When a link fails or any link on D→ _D '→LD→P( _LD →L _S )→L _S →S'→S fails unexpectedly, the nodes involved in the faulty link or the unexpectedly failed link can use The ring optical link structure implements service protection.

Further, a service protection device based on an air-ground integrated ring link structure provided in an embodiment of the present invention may further include: a ring link structure updating module 1005 .

The ring link structure update module 1005 is used to send a satellite selection notification to the satellite selection module before the current ring link structure fails;

Correspondingly, the satellite selection module 1002 is further configured to re-select two accessible satellites L _S ′, L _D ′ for the two ground stations S′, D′ respectively after receiving the satellite selection notification, And send a routing determination notification to the spatial optical connection routing determination module;

Correspondingly, the spatial optical connection routing determination module 1003 is further configured to determine the spatial optical connection route P( _LS ′→ _LD ′) from the satellite L _S ′ to _LD ′ after receiving the routing determination notification; and Send a link structure configuration notification to the ring link structure configuration module;

Correspondingly, the ring link structure configuration module ₁₀₀₄ is also _configured to, after receiving the link structure configuration notification, each The satellite is configured to form a new ring link structure of S→S'→L _S ′→P(L _S ′→L _D ′)→L _D ′→D'→D→S, as the current ring link structure ; and send the new ring link structure to each node in the new ring link structure, so that the fiber link failure at S→D or D→D'→L _D ′→P(L _D ′→L _S ′)→L _S ′→S'→When any link on S unexpectedly fails, the nodes involved in the failed link or the unexpected failure link can use the new ring optical link structure for business protection .

The technical solution of the embodiment of the present invention provides a service protection method based on an air-ground integrated ring link structure. For the first and last optical nodes S and D of the optical fiber link to be protected, ground stations S', D' and accessible input satellites L _S , _LD , after determining the space optical connection route P(L _S → _LD ) from satellite L _S to _LD , construct S→S'→L _S →P( L _S → L _D ) → L _D → D' → D → S ring link structure; when the ground optical fiber link fails or the inter-satellite and star-ground links fail unexpectedly, the working business will be directly switched to the ring link In the structure, it can protect the business protection of the ground optical fiber link in disaster scenarios, and can also realize the fast protection of the business when the inter-satellite optical link and the satellite-ground optical link fail, so as to realize the true sense of anti-destruction;

Moreover, since the optical connections between the satellites and the satellites in the ring link structure of the present invention mainly carry out the transmission of service data through laser signals, therefore, the optical signals in the optical fiber links on the ground do not need to carry out complicated signal processing. , protocol, rate, etc., you can use the inter-satellite and inter-satellite optical connections in the ring link structure to quickly protect services.

Those skilled in the art will appreciate that the present invention includes devices related to performing one or more of the operations described in this application. These devices may be specially designed and fabricated for the required purposes, or they may include known devices found in general purpose computers. These devices have computer programs stored therein that are selectively activated or reconfigured. Such a computer program can be stored in a device (e.g., computer) readable medium, including but not limited to any type of medium suitable for storing electronic instructions and respectively coupled to a bus. Types of disks (including floppy disks, hard disks, CDs, CD-ROMs, and magneto-optical disks), ROM (Read-Only Memory, read-only memory), RAM (Random Access Memory, random access memory), EPROM (Erasable Programmable Read-Only Memory, Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory, Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic card or optical card. That is, a readable medium includes any medium that stores or transmits information in a form readable by a device (eg, a computer).

Those skilled in the art will understand that computer program instructions can be used to implement each block in these structural diagrams and/or block diagrams and/or flow diagrams and combinations of blocks in these structural diagrams and/or block diagrams and/or flow diagrams . Those skilled in the art can understand that these computer program instructions can be provided to general-purpose computers, professional computers, or processors of other programmable data processing methods for implementation, so that the computer or processors of other programmable data processing methods can execute the present invention. A scheme specified in a block or blocks of a structure diagram and/or a block diagram and/or a flow diagram of the invention disclosure.

Those skilled in the art can understand that the various operations, methods, and steps, measures, and solutions in the processes discussed in the present invention can be replaced, changed, combined, or deleted. Further, other steps, measures, and schemes in the various operations, methods, and processes that have been discussed in the present invention may also be replaced, changed, rearranged, decomposed, combined, or deleted. Further, steps, measures, and schemes in the prior art that have operations, methods, and processes disclosed in the present invention can also be alternated, changed, rearranged, decomposed, combined, or deleted.

Those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is exemplary only, and is not intended to imply that the scope of the present disclosure (including claims) is limited to these examples; under the idea of the present invention, the above embodiments or Combinations between technical features in different embodiments are also possible, steps may be carried out in any order, and there are many other variations of the different aspects of the invention as described above, which are not presented in detail for the sake of brevity. Therefore, any omissions, modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A service protection method based on an air-ground integrated ring link structure, characterized in that it comprises: For the first and last optical nodes S and D of the optical fiber link to be protected, respectively select two ground stations S' and D' that can be accessed, and select two ground stations S' and D' that can be accessed satellites L _S , _LD ; Determine the space optical connection route P(L _S → L _D ) from the satellite L _S to L _D ; Configure S, D, S', D' and each satellite that P(L _S → L _D ) passes through to form S → S' → L _S → P(L _S → L _D ) → L _D → D' →D→S ring link structure; When the optical fiber link of S → D fails or any link on D → D' → L _D → P( _LD → L _S ) → L _S → S' → S fails unexpectedly, the ring optical link is used structure for business protection. 2. The method according to claim 1, characterized in that, the first and last optical nodes S, D of the optical fiber link to be protected select respectively two accessible ground stations S', D', specifically comprising : For the optical nodes S and D, respectively select the two nearest ground stations S' and D' that are not in the same shared disaster risk area. 3. The method according to claim 1, wherein the selecting two accessible satellites L _S and L _D for the two ground stations S' and D' respectively comprises: For each selected ground station, if there are multiple accessible LEO satellites for the ground station, the LEO satellite with the current maximum access duration is taken as the satellite selected for the ground station. 4. The method according to claim 1, wherein the determination of the spatial optical connection route _P ( _LS → _LD ) from the satellite LS to _LD specifically includes: Add satellites L _S and _LD to satellite set V; For each satellite in V, add to V the LEO satellites, MEO satellites, and GEO satellites that are accessible to that satellite, until no satellites can be added to the set V; and Add the laser links between the satellites in the set V to the laser link set E to form the space segment real-time network topology G(V,E); After deleting the laser link whose idle spectrum resource is less than the preset bandwidth value from G(V,E), use the shortest path algorithm in G(V,E) to calculate a spatial optical connection from satellite L _S to L _D Routing P(L _S → L _D ). 5. The method according to claim 1, characterized in that, each satellite that S, D, S', D' and P (L _S → L _D ) passes through is configured to form S → S' → L _S →P(L _S →LD )→LD → _D '→ _D →S ring link structure, specifically including: Configuring each node on the ring link structure with port resources reserved to the next node and having a bandwidth not less than a preset bandwidth value. 6. The method according to claim 4 or 5, wherein the preset bandwidth value is determined according to the bandwidth of the service to be protected in the optical fiber link to be protected. 7. The method according to any one of claims 1-5, further comprising: Before the ring optical link structure fails, re-select two accessible satellites L _S ', L _D ' for the two ground stations S', D'respectively; Determine the spatial optical connection route P(L _S ′→ _LD ′) from the satellite L _S ′ to _LD ′; Configure each satellite that S, D, S', D' and P(L _S ′→L _D ′) pass through to form S→S'→L _S ′→P(L _S ′→L _D ′)→ L _D '→D'→D→S new ring link structure. 8. A controller, characterized in that, comprising: The ground station selection module is used to select two accessible ground stations S' and D' respectively for the first and last optical nodes S and D of the optical fiber link to be protected; a satellite selection module, configured to select two accessible satellites L _S and L _D for the two ground stations S' and D'respectively; A space optical connection route determination module, used to determine the space optical connection route P(L _S → L _D ) from the satellite L _S to L _D ; The ring link structure configuration module is used to configure each satellite that S, D, S', D' and P(L _S → L _D ) pass through to form S → S' → L _S → P(L _S → L _D )→ _LD →D'→D→S ring link structure; and send the ring link structure to each node in the ring link structure, so that the optical fiber chain in S→D When a link fails or any link on D→ _D '→LD→P( _LD →L _S )→L _S →S'→S fails unexpectedly, the nodes involved in the faulty link or the unexpectedly failed link can use The ring optical link structure implements service protection. 9. The controller according to claim 8, further comprising: A ring link structure updating module, configured to send a satellite selection notification to the satellite selection module before the current ring link structure fails; and The satellite selection module is also used to reselect two accessible satellites L _S ′, L _D ′ for the two ground stations S′, D′ respectively after receiving the satellite selection notification, and send The spatial optical connection routing determination module sends a routing determination notification; and The spatial optical connection routing determination module is also used to determine the spatial optical connection route P( _LS ′→ _LD ′) from the satellite L _S ′ to _LD ′ after receiving the routing determination notification; The ring structure configuration module sends a link structure configuration notification; and The ring link structure configuration module is also used for performing each satellite passing by S, D, S', D' and P (L _S '→L _D ') after receiving the link structure configuration notification Configuration, forming a new ring link structure of S→S'→L _S ′→P(L _S ′→L _D ′)→L _D ′→D'→D→S; and the new ring link structure Issued to each node in the new ring link structure, so that the fiber link at S→D fails or D→ _D '→LD ′→P( _LD ′→L _S ′)→L _S ′ →S'→When any link on S unexpectedly fails, the failed link or the nodes involved in the unexpectedly failed link can utilize the ring optical link structure for service protection. 10. The controller of claim 8, wherein: The spatial optical connection routing determination module is specifically used to add satellites _LS and _LD to the satellite set V; and for each satellite in V, the LEO satellite, MEO satellite and GEO satellite that can be connected to the satellite Add to V until no satellite can be added to the set V; and add the laser link between the satellites in the set V to the laser link set E to form the space segment real-time network topology G(V,E); after that , after deleting the laser link whose idle spectrum resource is less than the preset bandwidth value from G(V,E), use the shortest path algorithm to calculate a space optical link from satellite L _S to L _D in G(V,E) Connect the route P(L _S → L _D ).