CN109547095B - Method for relieving congestion in satellite communication process - Google Patents
Method for relieving congestion in satellite communication process Download PDFInfo
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- CN109547095B CN109547095B CN201811486148.5A CN201811486148A CN109547095B CN 109547095 B CN109547095 B CN 109547095B CN 201811486148 A CN201811486148 A CN 201811486148A CN 109547095 B CN109547095 B CN 109547095B
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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
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
- H04B7/18584—Arrangements for data networking, i.e. for data packet routing, for congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
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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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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to a method for relieving congestion in a satellite communication process, which comprises the following steps: forming a communication network by a plurality of satellites and at least arranging a first virtual operating system and a second virtual operating system on a bottom operating system forming each satellite in the communication network; constructing a first sub-network of the communication network by means of communication connections of several first virtual operating systems; constructing a second sub-network of the communication network having a different routing rule from the first sub-network through communication connections of a number of second virtual operating systems; when the corresponding satellite node is congested in one of the first sub-network and the second sub-network, the first virtual operating system or the second virtual operating system of the corresponding satellite node acquires at least part of data to be transmitted from the other congested party to the outside through an internal channel of the host machine so as to switch the sub-network for transmitting at least part of the data.
Description
Technical Field
The invention relates to the technical field of telecommunication, in particular to a method for relieving congestion in a satellite communication process.
Background
Satellites may be deployed in orbit to provide various space-based operations, such as military and civilian observation operations, communication operations, navigation operations, weather operations, and research operations. The satellite may include various sensors and communication devices for performing the required tasks.
The existing method for relieving congestion of the satellite is mainly at an algorithm level.
For example, chinese patent document with an authorization publication number of CN102083133B discloses a congestion control method for a satellite network, which is improved based on the Vegas algorithm and is suitable for congestion control of the satellite network. The influence of RTT fluctuation caused by distance change is removed from the RTT, the calculation method of BaseRTT in Vegas is improved, the improved BaseRTT is called BaseRTT _ sat and can change along with the change of the distance, and therefore the performance of the satellite network can be estimated more accurately, and the congestion window of the network can be adjusted accurately. The method eliminates the influence of communication distance change on congestion control of the Vegas algorithm in the satellite network, improves the performance of the Vegas algorithm in the satellite network, improves the fairness of satellite network bandwidth allocation, and is more suitable for the satellite network.
For another example, chinese patent document with publication number CN104202257B discloses a method for controlling satellite network congestion based on bandwidth estimation, which includes the following steps: s1: establishing a network transmission link; s2: performing data communication by adopting a Hybla-BE congestion control algorithm; s3: a TCP sending end of the ground station I calculates a bandwidth estimation value according to the receiving frequency of the arriving ACK; s4: calculating an expected bandwidth; s5: calculating the residual bandwidth of the communication network, a congestion window increase factor rho current of a Hybla algorithm and a congestion window increase factor rho new of a Hybla-BE algorithm; s6: adjusting the congestion window value according to the adjusted window growth factor rho new; s7: adjusting the congestion window value: a TCP sending end of a ground station I predicts the bandwidth environment of the network by dynamically estimating the bandwidth value, and scales and adjusts the window growth factor according to the residual bandwidth, so that the increase of the congestion window value can dynamically adapt to the network bandwidth condition.
However, there is a bottleneck in improving the algorithm, and therefore, the invention aims to improve from the system architecture level to relieve congestion in the satellite communication process.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for relieving congestion in the satellite communication process, which comprises the steps of constructing two virtual operating systems on the same satellite, and then respectively constructing two first sub-networks and second sub-networks which are parallel to each other and have different routing rules from each other through the two virtual operating systems of a plurality of satellites, so that routing paths started simultaneously are more diversified and dispersed compared with the prior art, and the congestion can be relieved through the first form; and because two sets of parallel sub-networks are constructed by using the same set of hardware, when the corresponding satellite node in one sub-network is congested, the sub-network for data transmission can be switched through the internal communication of the satellite node so as to relieve the congestion in the second form, so that the communication efficiency and the capacity of relieving the congestion of the invention are improved.
According to a preferred embodiment, a method for relieving congestion in satellite communication process includes: forming a communication network by a plurality of satellites and at least arranging a first virtual operating system and a second virtual operating system on a bottom operating system forming each satellite in the communication network; constructing a first sub-network of the communication network by means of communication connections of several first virtual operating systems; constructing a second sub-network of the communication network having a different routing rule from the first sub-network through communication connections of a number of second virtual operating systems; when the corresponding satellite node is congested in one of the first sub-network and the second sub-network, the first virtual operating system or the second virtual operating system of the corresponding satellite node acquires at least part of data to be transmitted externally by the other congested party through an internal channel of the corresponding satellite node so as to switch the sub-network for transmitting the at least part of data.
According to a preferred embodiment, a ground station generates a first routing rule and a second routing rule different from the first routing rule, the ground station sends the first routing rule to a first virtual operating system and sends the second routing rule to a second virtual operating system, wherein the corresponding first virtual operating system is configured to perform routing according to a principle that an optimal path is selected from the optimal paths as a routing path according to the first routing rule, and the corresponding second virtual operating system is configured to perform routing according to a principle that an optimal path is selected from the remaining paths as a routing path after a preset number of paths ranked in the top order are omitted from the optimal paths according to the second routing rule.
According to a preferred embodiment, the preset number is set by the ground station, and the preset number is greater than or equal to two so as to reduce the overlapping of routing paths of the second sub-network and the first sub-network when the two sub-networks communicate between the same two nodes; the preset number is related to the total number of the plurality of satellites constituting the communication network, and the larger the total number of the plurality of satellites is, the larger the value of the preset number is.
According to a preferred embodiment, when some of the satellite nodes in the first sub-network or the second sub-network are congested, the congested some satellite nodes broadcast the congested congestion situation to the first sub-network and the second sub-network at the same time, and the corresponding first virtual operating system and the corresponding second virtual operating system adjust the ordering of the preferred paths from the corresponding source satellite node to the destination satellite node in an associated manner at least partially according to the received congestion situation.
According to a preferred embodiment, the process of the respective first virtual operating system and the respective second virtual operating system adjusting the ordering of the preferred paths from the respective source satellite node to the destination satellite node associatively depending at least in part on the received congestion situation comprises: confirming the congested satellite nodes and the congested sub-networks according to the congestion condition; the ordering of the preferred paths from the satellite node receiving the broadcast to the destination satellite node in the non-congested subnetwork is adjusted at least partially in dependence on the congestion situation and the first ordering result to obtain a second ordering result after the ordering of the preferred paths from the satellite node receiving the broadcast to the destination satellite node in the congested subnetwork is adjusted at least partially in dependence on the congestion situation to obtain a first ordering result.
According to a preferred embodiment, the communication network is composed of a first constellation of several satellites operating in a first orbital layer and a second constellation of several satellites operating in a second orbital layer; the corresponding first virtual operating system and the corresponding second virtual operating system are configured to enable one of the first virtual operating system and the second virtual operating system arranged on the same satellite to preferentially select a path in the same orbit layer to bypass a congested neighbor satellite according to the congestion condition of the neighbor satellite of the satellite where the first virtual operating system and the second virtual operating system are arranged to communicate, and the other one of the first virtual operating system and the second virtual operating system arranged on the same satellite to preferentially select a cross path of an adjacent orbit layer to bypass the congested neighbor satellite according to the congestion condition of the neighbor satellite of the satellite where the first virtual operating system and the second virtual operating system are arranged to communicate.
According to a preferred embodiment, the method further comprises: the method comprises the steps that a ring link configuration file sent by a ground station is received through at least one satellite node in a first satellite cluster and/or a second satellite cluster, a plurality of ring links are periodically established in a local area in a communication network by the first satellite cluster and the second satellite cluster according to the ring link configuration file, each ring link is composed of at least three satellite nodes, when one communication direction of the ring link is congested, communication is preferentially attempted through a reverse communication direction of the ring link, which is opposite to the communication direction, and data is transmitted by switching a mode of a sub-network for transmitting the data only when the reverse communication direction is still congested.
According to a preferred embodiment, a plurality of satellites comprising a communication network periodically update a routing table according to a ring link profile to establish a plurality of ring links that periodically change.
According to a preferred embodiment, all the satellites that make up the communication network, when transferring data to the ground station, also transmit this data associatively to the ground station via the satellite number, via the time of day and via the position of each satellite, at the ground station, according to the hot spot paths related to the satellite groups of a plurality of satellite numbers, the passing time and the passing position, the ground station also analyzes the position regularity of each satellite according to the received orbit parameters of a plurality of satellites, the ground station clusters a plurality of satellites which have position rules and keep the position rules in at least a preset number of regular cycles into a first cluster according to the position rule information, the satellites visible in the periodic time period are then clustered in the first cluster into second clusters according to the time period visibility, and a ring link profile is constructed according to the second clusters and the periodic time period associated with each second cluster.
According to a preferred embodiment, network traffic is routed to the destination satellite node using the reverse or forward communication direction based at least on status information of the communication network indicating that the forward or reverse communication direction of the ring link of the communication network is experiencing congestion and/or failure.
Drawings
FIG. 1 is a block diagram of a preferred embodiment of a virtual operating system provided with a satellite for use with the present invention;
FIG. 2 is a simplified schematic diagram of a preferred embodiment of the present invention; and
figure 3 is a simplified schematic diagram of a preferred embodiment of a ring link.
List of reference numerals
100: the satellite 110: first virtual operating system
120: the second virtual operating system 130: first backup virtual operating system
140: second backup virtual operating system 200: ground station
300: the ring link 310: forward direction of communication
320: reverse direction of communication
Detailed Description
This is described in detail below with reference to figures 1, 2 and 3.
In the description of the present invention, it is to be understood that, if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are used for indicating the orientation or positional relationship indicated based on the drawings, they are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is also to be understood that the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, the term "plurality", if any, means two or more unless specifically limited otherwise.
In the description of the present invention, it should be further understood that the terms "mounting," "connecting," "fixing," and the like are used in a broad sense, and for example, the terms "mounting," "connecting," "fixing," and the like may be fixed, detachable, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To one of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood as appropriate, unless explicitly stated and/or limited otherwise.
In the description of the present invention, it should also be understood that "over" or "under" a first feature may include the first and second features being in direct contact, and may also include the first and second features being in contact not directly but through another feature therebetween, unless expressly stated or limited otherwise. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1
This embodiment discloses a method for congestion relief during satellite communications, or a satellite communications method, or a subnetwork-based satellite communications method, which may be implemented by the system of the present invention and/or other alternative components. For example, the method of the present invention may be implemented using various components of the system of the present invention.
According to a preferred embodiment, the method may comprise: forming a communication network by a plurality of satellites and arranging at least a first virtual operating system 110 and a second virtual operating system 120 on an underlying operating system forming each satellite within the communication network; constructing a first sub-network of the communication network by means of the communication connections of several first virtual operating systems 110; constructing a second sub-network of the communication network having a different routing rule from the first sub-network through the communication connections of the number of second virtual operating systems 120; and/or when the corresponding satellite node is congested in one of the first sub-network and the second sub-network, the first virtual operating system 110 or the second virtual operating system 120 of the corresponding satellite node acquires at least part of data to be transmitted externally by the other party with the congestion through an internal channel of the corresponding satellite node to switch the sub-network for transmitting at least part of the data. That is, the party with no congestion acquires at least part of the data of the other party with congestion and transmits the part of the data to the destination address through the sub-network in which the party with no congestion is located. For example, when congestion occurs in a corresponding satellite node in a first sub-network, at least a part of data of the first virtual operating system 110 of the corresponding satellite node is transmitted to the second virtual operating system 120 of the corresponding satellite node through a memory-sharing communication mode, so that the transmission is transferred to a second sub-network. Preferably, the internal channel refers to an internal channel provided for a virtual operating system deployed thereon on the same satellite as a host. For example, an internal channel provided in a memory sharing manner is provided for the first virtual operating system 110 and the second virtual operating system 120 to communicate. The invention can at least realize the following beneficial technical effects by adopting the mode: firstly, a first sub-network and a second sub-network with different routing rules are established on the same set of hardware through different virtual operating systems, so that routing paths enabled simultaneously are more diversified and dispersed compared with the prior art, and the congestion can be relieved through the first form; secondly, because two sets of sub-networks which are parallel to each other are constructed by using hardware of the same satellite, when congestion occurs to a corresponding satellite node in a first sub-network, the congestion does not occur to the corresponding satellite node in a second sub-network, so that when the congestion occurs to the corresponding satellite node, the invention can transfer a specific communication sub-network of partial data by adopting an internal communication mode between a first virtual operating system 110 and a second virtual operating system 120 which are deployed on the corresponding satellite node, thereby relieving the congestion by adopting the second mode; and thirdly, two virtual operating systems are built on the same satellite, compared with the existing method that each satellite only has one operating system, the method has the advantage that the whole satellite is not completely offline due to the crash of a single operating system, and when the operating systems need to be updated, the two virtual operating systems can be updated at different time intervals, so that the satellite can complete system updating in a working state.
According to an alternative embodiment, the reception of the data may be under the responsibility of the underlying operating system of each satellite. The forwarding of data may be performed by the first virtual operating system 110 and/or the second virtual operating system 120 according to respective routing rules. For example, during networking, each satellite is assigned a routing address, a first port and a second port, the routing address is associated with the underlying operating system to determine a specific satellite node to which data flows, the first port and the second port are respectively associated with the first virtual operating system 110 and the second virtual operating system 120 to determine whether the data is forwarded by the first virtual operating system 110 in the first sub-network or the second virtual operating system 120 in the second sub-network.
According to an alternative embodiment, each satellite may have at least two sets of communication modules. For example, each satellite may include at least a first communication module and a second communication module. The plurality of first virtual operating systems are respectively networked through the first communication modules of the satellites respectively to form a first sub-network, and the plurality of second virtual operating systems are respectively networked through the second communication modules of the satellites respectively to form a second sub-network.
According to another alternative embodiment, each satellite may have only one set of communication modules. The first sub-network and the second sub-network are jointly constructed between the satellites through the respective only communication modules. The first sub-network and the second sub-network may transmit information through different time slots. That is, the first sub-network and the second sub-network can perform data transmission by using one set of communication modules by means of time slot transmission.
Preferably, the first virtual operating system 110 and/or the second virtual operating system 120 may be virtual machines or containers, and particularly preferably containers, which are more lightweight, faster to boot, and less expensive, and are more suitable for situations where the memory and computing resources of the satellite are limited and cannot be upgraded.
According to a preferred embodiment, the method may comprise: generating, by the ground station 200, a first routing rule and a second routing rule different from the first routing rule; and/or the ground station 200 sends the first routing rule to the first virtual operating system 110 and the second routing rule to the second virtual operating system 120. The first routing rule may be a rule for routing according to a principle of selecting an optimal path from the optimal paths as a routing path. The second routing rule may be a rule that routes are performed according to a principle that after a preset number of paths ranked in the top order are omitted from the preferred paths, the optimal path is selected from the remaining paths as a routing path. Preferably, the management distance may be a reference value providing a degree of preference of the routing path. The smaller the management distance, the more preferable the routing path. That is, a routing path with a smaller administrative distance takes precedence over a routing path with a larger administrative distance. The communication delay may be another reference value that provides a degree of preference for the routing path. The lower the communication delay, the more preferred the routing path. Preferably, the first virtual operating system 110 and the second virtual operating system 120 may order the preferred paths by a weighting method according to the management distance and the communication delay. Preferably, the predetermined number of paths in the second routing rule that ignore the preferred path may be set by the user or a decision-making device at the ground station 200. Preferably, the predetermined number may be two or more, particularly preferably three or five or more. Because if only one preferred path is ignored, congestion of a new path is still likely to result if the path is changed when congestion locally occurs. The number of networked satellites may be referenced when setting. The more the satellites are networked, the more the number of the set ignored optimal paths is, so that the second sub-network can adopt a cooler routing path to route data, the overlapping and interference of the paths of the two sub-networks can be reduced, the resource of the satellite network can be fully utilized, the transmission efficiency can be improved, and the congestion can be relieved.
According to a preferred embodiment, the communication network may be composed of a first constellation of several satellites operating in a first orbital layer and a second constellation of several satellites operating in a second orbital layer. The first routing rule and the second routing rule may be set to allow one of the first virtual operating system 110 and the second virtual operating system 120 disposed on the same satellite to preferentially select a neighboring satellite in the same orbit layer whose path bypasses the congestion according to the congestion condition of the neighboring satellite of the satellite where the one is located to communicate, and allow the other one to preferentially select a neighboring satellite in an adjacent orbit layer whose cross path bypasses the congestion according to the congestion condition of the neighboring satellite of the satellite where the one is located to communicate. Preferably, for example, the first virtual operating system 110 preferentially selects a neighboring satellite node whose path bypasses the congestion in the same orbit layer for communication, and the second virtual operating system 120 preferentially selects a neighboring satellite node whose cross path bypasses the congestion in the first orbit layer and the second orbit layer for communication according to the congestion condition of the neighboring satellite of the satellite in which the second virtual operating system is located. Or, the second virtual operating system 120 preferentially selects a path in the same orbit layer for communication to bypass a neighboring satellite node with congestion, and the first virtual operating system 110 preferentially selects a cross path from the first orbit layer and the second orbit layer for communication according to the congestion condition of the neighboring satellite of the satellite in which the first virtual operating system is located. Preferably, a cross path may refer to a communication path that is at least partially composed of channels made up of at least one satellite operating in a first orbital layer and at least one satellite operating in a second orbital layer. For another example, when a local satellite node in a first sub-network is congested, a satellite node that transmits data to the local satellite node preferentially finds an alternative communication path from a neighbor satellite node on the same layer of the same orbit layer of the local satellite node, and when a local satellite node in a second sub-network is congested, a satellite node that transmits data to the local satellite node preferentially finds an alternative communication path from a neighbor satellite node on a different layer of the adjacent orbit layer of the local satellite node. The invention can at least realize the following beneficial technical effects by adopting the mode: after congestion of certain satellite nodes occurs, the problem that the data volume of other nodes is rapidly increased to cause congestion due to the fact that the same mechanism for bypassing the congested nodes is adopted by the satellites which send data to the congested satellite nodes is avoided. The satellites in the first and second layers of orbit are preferably differentiated in figure 2 by shape. The satellites shown in circles may be satellites in a first orbital layer, which constitute a first constellation. The satellites shown by the quadrangle may be satellites in a second orbital layer, the satellites forming a second constellation. Preferably, in the present invention, the satellite 100 is generally referred to as a general term, and may refer to a satellite in a first constellation or a satellite in a second constellation.
According to a preferred embodiment, when some satellite nodes in the first sub-network or the second sub-network are congested, some congested satellite nodes can broadcast the congested congestion condition to the first sub-network and the second sub-network at the same time. The respective first virtual operating system 110 and the respective second virtual operating system 120 can associatively adjust the ordering of the preferred paths based at least in part on the received congestion condition. The invention can at least realize the following beneficial technical effects by adopting the mode: although congestion may currently occur in only one sub-network, the congestion condition of one sub-network is broadcast to two sub-networks simultaneously, so that the adjustments of the two sub-networks are related to each other, and a situation that secondary congestion occurs in a neighboring area immediately after the adjustment path is reduced occurs.
Preferably, the process of the respective first virtual operating system 110 and the respective second virtual operating system 120 adjusting the ordering of the preferred paths associatively based at least in part on the received congestion situation may include: confirming the congested satellite nodes and the congested sub-networks according to the congestion condition; and/or after the sequencing of the preferred paths from the satellite node receiving the broadcast to the destination satellite node is adjusted at least partially according to the congestion condition in the congested sub-network to obtain a first sequencing result, adjusting the sequencing of the preferred paths from the satellite node receiving the broadcast to the destination satellite node in the uncongested sub-network at least partially according to the congestion condition and the first sequencing result to obtain a second sequencing result. For example, assuming that one satellite node in a first sub-network is congested and then broadcasts the congested congestion condition to the first sub-network and a second sub-network at the same time, after another satellite node receives the congestion condition, first, the first sub-network adjusts the order of the preferred paths from the another satellite node to the corresponding destination satellite node at least partially according to the congestion condition to obtain a first order result, and then, the another satellite node adjusts the order of the preferred paths from the another satellite node to the corresponding destination satellite node in the second sub-network at least partially according to the congestion condition and the first order result to obtain a second order result. The ordering of the preferred paths is adjusted based at least in part on congestion because the same satellite may receive two or more congestion conditions during the same time period. Preferably, it should be noted that the adjustment of the ranking results does not represent that the actual path necessarily changes, because the optimal path of a satellite node that is somewhat farther away from the congested satellite node may not need to pass through the congested satellite node, and the adjustment of the ranking results may simply be an adjustment of the order of the part of the path that is ranked later. Preferably, the sub-networks may comprise or may imply the first sub-network and/or the second sub-network. The invention can at least realize the following beneficial technical effects by adopting the mode: firstly, path adjustment of a corresponding sub-network with congestion can be satisfied preferentially so as to relieve the congestion quickly; secondly, the paths of the sub-networks without congestion are adjusted according to the sorting result of the path adjustment of the corresponding sub-networks with congestion, so that the preferred path in the first sorting result is avoided, and the alternative paths are selected to reduce the overlapping degree of the paths so as to improve the overall communication efficiency.
According to a preferred embodiment, the first track layer may have a higher ground clearance than the second track layer. That is, the first track layer spatially covers the second track layer.
According to a preferred embodiment, the method may comprise: the ring link profile transmitted by the ground station 200 is received by at least one satellite node in the first constellation and/or the second constellation. The first constellation and the second constellation may be a plurality of ring links periodically established within a local area within the communications network according to a ring link profile and each ring link is comprised of at least three satellite nodes. When congestion occurs in one communication direction of a ring link, communication may be preferentially attempted in a reverse communication direction 320 of the ring link, which is opposite to the communication direction, and data may be transmitted by attempting to switch the sub-network that transmits the data only when congestion still exists in the reverse communication direction 320. For example, by receiving a ring link profile transmitted by the ground station 200 through a satellite node in the first satellite constellation and/or the second satellite constellation, at least three first virtual operating systems 110 or at least three second virtual operating systems 120 establish a forward ring link and a reverse ring link opposite to each other in the information flow direction in a local area within the communication network according to the ring link profile, when one first virtual operating system 110 or second virtual operating system 120 in the forward ring link needs to transmit data to the other first virtual operating system 110 or second virtual operating system 120 in the forward ring link through the forward ring link but the forward ring link is congested, one first virtual operating system 110 preferentially attempts to route the data to the other first virtual operating system 110 through the reverse ring link corresponding to the forward ring link, it is attempted to switch the way of transmitting the sub-network of data to transmit the data only when congestion still exists on the reverse loop link. The invention can at least realize the following beneficial technical effects by adopting the mode: in the prior art, if one link is not through, another link different from the link is tried to transmit data, in this process, not only is the computational overhead involved in path planning, but also if many satellites are attempting one link immediately another completely different link if the link is not through, network congestion is easily induced and the situation of such congestion is more obvious over time, resulting in a reduction in the transmission efficiency of the satellite communication network, after the invention constructs the ring link, the two communication directions opposite to each other can reach the destination satellite node, in the event of congestion or partial failure in one direction, prior attempts to communicate via reverse communication can quickly effectuate communication between these satellites, the aforementioned situation can be avoided and the computational overhead of the satellite can be further reduced and the efficiency of the overall network can be improved. Preferably, in a case where, among the ring link and the linear link from the source satellite node to the destination satellite node, which are composed of the same number of satellite nodes, the maximum management distance of the ring link is less than or equal to the management distance of the linear link that is a preset multiple, the distance attribute of the ring link in the routing table is set before the linear link. Since the ring link has both communication directions to reach the destination address, the maximum management distance refers to the management distance having the longest communication path therein. Assuming that the managed distances of a ring link from the source satellite node to the destination satellite node include 5800km and 6000km, the managed distance of one linear link is 5000km, and the preset multiple is 1.2, the maximum managed distance 6000km is equal to the managed distance 6000km of the linear link of the preset multiple, and the managed distance attribute of the ring link in the routing table is set before the linear link. That is, the ring link is more likely to be selected as a routing path than the linear link, assuming that other attributes except distance are the same. A linear link may refer to a communication link that does not form a loop link. Referring to fig. 3, a ring link 300 in a first orbital layer is shown in fig. 3, in particular a ring link 300 made up of several satellites in the outer layer; also shown in fig. 3 is a ring link in the first track layer, specifically a ring link 300 made up of several satellites in the inner layer of the figure; also shown in fig. 3 is a ring link 300 formed by several satellites in two adjacent track layers, which does not show two communication directions of the ring link for clarity of the drawing, and only the ring link is indicated by a dashed box.
Preferably, one satellite node may provide the various profiles mentioned in the present invention to other satellite nodes in the same peer-to-peer group, allowing the other satellite nodes to provide operation of the application without receiving communications directly from the ground station 200. In addition, similar to providing the initial configuration to the satellite nodes, the ground station 200 may also be used to provide updates to each application operating in the satellite nodes, and may also update any scheduling information on each satellite node.
Preferably, the various profiles mentioned in the present invention may have a variety of specific formats to fit into heterogeneous satellite communication networks. For example, the ring link configuration file may have multiple format versions to fit heterogeneous satellite implementation configurations.
Preferably, the ring link may comprise various logical, physical and/or application programming interfaces. The ring link may use optical, air, space, or some other element as the transmission medium. The communications of the first track layer and the second track layer may each use various protocols and formats, such as internet protocol, ethernet, transmission control protocol, WiFi, bluetooth, and/or some other communications format. The ring links may include at least one of routers, switches, bridges, and traffic processing nodes for transporting traffic between the endpoints.
According to a preferred embodiment, all the satellites that make up the communication network, in passing data to the ground station 200, can also transmit the data associatively to the ground station 200 via the satellite number, the transit time and the transit position of each satellite. The hotspot paths associated over time by the constellation of satellites forming the communication network may be analyzed at the ground station 200 according to a number of satellite numbers, elapsed times and elapsed positions. The ground station 200 may analyze the regularity of the position of each satellite based on the received orbital parameters of several satellites. The ground station 200 may cluster a plurality of satellites having a position rule and maintaining the position rule in at least a predetermined number of rule periods into a first cluster according to the position rule information. The ground station may cluster satellites visible within the periodic time period in the first cluster into a second cluster according to the time period visibility. The ground station may construct a ring link profile that at least partially covers the hotspot path according to the second clusters and the periodic time periods associated with each second cluster. The invention can at least realize the following beneficial technical effects by adopting the mode: firstly, a satellite showing stable periodic visibility is used for constructing a ring link according to the position regularity so as to ensure the reliability of the ring link; secondly, the hot spot path is constructed into a ring link, so that the stability of the hot spot path is improved. Preferably, the orbit parameter may include at least one of a rising point right ascension, an orbit inclination, an orbit long radius, an orbit eccentricity, a perigee angular distance, a perigee time, and a true perigee angle, and the ground station 200 may determine the position parameter of the corresponding satellite through the orbit parameter. Preferably, the plurality of ground stations 200 may receive the plurality of satellite numbers, the elapsed time and the elapsed location, respectively, and aggregate the received plurality of satellite numbers, the elapsed time and the elapsed location to one of the ground stations 200 to form aggregated data, and the one of the ground stations 200 may construct the ring link profile according to the received aggregated data.
According to a preferred embodiment, the plurality of satellites comprising the communication network may periodically update the routing table according to the ring link profile to establish a plurality of ring links that periodically change. Preferably, the plurality of satellites constituting the communication network construct a plurality of ring links that vary with time period according to a ring link profile. The number and location of the links in the ring varies because the visibility of portions of the satellites varies periodically with relative movement of the satellites. Preferably, the periodic updating of the routing table according to the ring link profile is updated as the periodic movement of several satellites making up the communication network causes the visibility of a part of the satellites to change periodically. Preferably, the routing table is updated by deleting the ring link with the failed current period from the routing table and adding the ring link with the added current period to the routing table. The invention can at least realize the following beneficial technical effects by adopting the mode: the reliability of the ring link within the routing table can be ensured, enabling efficient transmission of data.
According to a preferred embodiment, network traffic is routed to the destination satellite node using the reverse communication direction 320 or the forward communication direction 310 based on at least status information of the communication network indicating that the forward communication direction 310 or the reverse communication direction 320 of the ring link of the communication network is experiencing congestion and/or failure. For example, in the satellite communication process, after data transmitted by a source satellite node through a ring link reaches a corresponding intermediate satellite node, state information of the intermediate satellite node is added, and after the data reaches a destination satellite node, the summarized state information is fed back to the source node satellite, and the source node satellite updates a routing table according to the summarized state information, so that the updated routing table is used as a basis for selecting the forward communication direction 310 or the reverse communication direction 320. Preferably, the forward and reverse communication directions are for the sake of differentiation only, and in a ring link, one direction is the forward communication direction and the other is the directional communication direction.
Preferably, during routing of traffic of the communication network, a traffic direction over which traffic is routed to be preferentially taken when reaching the respective destination satellite node is determined based in part on the state information of the ring links. That is, assuming that a data can be more quickly sent to the destination address through the reverse communication direction 320 of a ring link, but the reverse communication direction 320 is experiencing congestion, the forward communication direction 310 is preferably employed to route network traffic to the destination satellite node. Preferably, the status information may include a congestion status and/or a fault status.
Preferably, one satellite node may each exchange congestion states with one or more other satellite nodes and the ground station 200 for the platform. The congestion status may include current congestion status information for each application, such as the task or process being operated, and may also exchange data generated at least in part from sensors of the satellite. The data may be used in a peer-to-peer group, where a first satellite may identify a first set of data and provide the first set of data to a second satellite. The second satellite may then identify a second set of data and process the first and second sets of data defined by the application to determine a corresponding object. As an example, this operation may be used in an imaging operation, where a first satellite may take an image of an object over a first time period and provide an associated first set of data for the image to a second satellite. The second satellite may take a subsequent image and use a second set of data with the subsequent image for the first image and the subsequent image to determine the object.
According to a preferred embodiment, each satellite includes at least a first backup virtual operating system 130 and a second backup virtual operating system 140, the first backup virtual operating system 130 is in an online state in real time and monitors the state of the first and second virtual operating systems 120, takes over the role of the failed first or second virtual operating system 120 when at least one of the first and second virtual operating systems 120 fails and wakes up the second backup virtual operating system 140 in a dormant state to continue monitoring the first and second virtual operating systems 120 and prepare to replace the subsequently failed first or second virtual operating system 120. That is, assuming that the second virtual operating system 120 fails, the first backup virtual operating system 130 takes over the role of the second virtual operating system 120 as the second virtual operating system 120 performs its tasks.
Preferably, after the failed first or second virtual operating system 120 is restarted, the second backup virtual operating system 140 notifies that its role in the satellite node has been taken over by the first backup virtual operating system 130, and then the failed first or second virtual operating system 120 takes over the role of the first backup virtual operating system 130 to enter a sleep state to be woken up by the second backup virtual operating system to continue monitoring the first and second virtual operating systems 120 when the second backup virtual operating system 140 will take over the first and second virtual operating systems 120.
Example 2
This embodiment may be a further improvement and/or a supplement to embodiment 1, and repeated contents are not described again. The preferred embodiments of the present invention are described in whole and/or in part in the context of other embodiments, which can supplement the present embodiment, without resulting in conflict or inconsistency.
According to a preferred embodiment, the method may comprise: forming a communication network by a first constellation consisting of a plurality of satellites operating in a first orbit layer and a second constellation consisting of a plurality of satellites operating in a second orbit layer; at least a first virtual operating system 110 and a second virtual operating system 120 which are communicated with each other in a memory sharing mode are arranged on the bottom operating system of each satellite participating in the networking of the communication network; the integrated communication network includes a first sub-network of all the first virtual operating systems 110 and a second sub-network of all the second virtual operating systems 120; the first sub-network is configured by a first path profile to execute a first routing rule and the second sub-network is configured by a second path profile to execute a second routing rule.
According to a preferred embodiment, the method may comprise: forming a loop link in at least one of the first track layer and the second track layer; and/or selectively exchanging communications between the first and second orbit layers over the ring link based at least in part on a congestion state of the communications network during satellite communications.
According to a preferred embodiment, the method may comprise: a first satellite group formed by a plurality of satellites operating in a first orbit layer and a second satellite group formed by a plurality of satellites operating in a second orbit layer form an integrated communication network; at least a first virtual operating system 110 and a second virtual operating system 120 are arranged on the operating system of each satellite node participating in the networking of the communication network; the communication network includes a first sub-network of all the first virtual operating systems 110 and a second sub-network of all the second virtual operating systems 120; the first sub-network is configured by a first path configuration file, when a local satellite node in the first sub-network is congested, a satellite node sending data to the local satellite node at least partially searches for an alternative communication path from a neighbor satellite node on the same layer of the same orbit layer of the local satellite node, and when the local satellite node in the second sub-network is congested, a satellite node sending data to the local satellite node at least partially searches for an alternative communication path from a neighbor satellite node on a different layer of the adjacent orbit layer of the local satellite node; when the first sub-network of the host satellite node where the corresponding first virtual operating system 110 is located is congested, the second virtual operating system 120 of the host satellite node broadcasts the condition of the first virtual operating system 110 to the associated satellite node and routes according to the second path profile according to the request of the first virtual operating system 110 of the host satellite node.
Example 3
The present embodiment discloses a satellite communication system, and more particularly, to a satellite communication system capable of relieving congestion, which is adapted to perform the steps of the method described in the present invention to achieve the desired technical effect.
According to a preferred embodiment, the satellite communication system may comprise several satellites. At least a first virtual operating system 110 and a second virtual operating system 120 may be disposed on the underlying operating system of each satellite. The communication connections of the number of first virtual operating systems 110 constitute a first sub-network of the communication network. The communication connections of several second virtual operating systems 120 build up second sub-networks of the communication network having different routing rules than the first sub-network. When the corresponding satellite node is congested in one of the first sub-network and the second sub-network, the first virtual operating system 110 or the second virtual operating system 120 of the corresponding satellite node may acquire at least part of data to be transmitted externally by the other party with the congestion through an internal channel of the corresponding satellite node to switch the sub-network transmitting at least part of the data.
According to a preferred embodiment, the satellite communication system comprises a first constellation of satellites orbiting in a first orbital layer and a second constellation of satellites orbiting in a second orbital layer, a communication network formed between the satellites, the satellite communication system configured to selectively exchange communications between the first orbital layer and the second orbital layer based at least in part on a congestion state or congestion condition of the communication network. Preferably, a loop link capable of spirally circulating communication traffic is constructed in at least one of the first track layer and the second track layer.
It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.
Claims (9)
1. A method for alleviating congestion during satellite communications, comprising:
forming a communication network by a plurality of satellites and arranging at least a first virtual operating system (110) and a second virtual operating system (120) on an underlying operating system forming each satellite within the communication network;
-building a first sub-network of the communication network through communication connections of several first virtual operating systems (110);
constructing a second sub-network of the communication network having a different routing rule than the first sub-network by means of the communication connections of several second virtual operating systems (120);
when the corresponding satellite node is congested in one of the first sub-network and the second sub-network, the first virtual operating system (110) or the second virtual operating system (120) of the corresponding satellite node acquires at least part of data to be transmitted externally by the other congested party through an internal channel of the corresponding satellite node so as to switch the sub-network for transmitting the at least part of data;
generating a first routing rule and a second routing rule different from the first routing rule through a ground station (200), wherein the ground station (200) sends the first routing rule to a first virtual operating system (110) and sends the second routing rule to a second virtual operating system (120), the corresponding first virtual operating system (110) is configured to route according to a principle that an optimal path is selected from the optimal paths as a routing path according to the first routing rule, and the corresponding second virtual operating system (120) is configured to route according to a principle that the optimal path is selected from the rest of paths as the routing path after a preset number of paths ranked in the optimal path are ignored according to the second routing rule.
2. The method of claim 1, wherein the predetermined number is set by the ground station (200) and is greater than or equal to two to reduce the overlap of the routing paths of the second sub-network and the first sub-network when communicating between the same two nodes;
the preset number is related to the total number of the plurality of satellites constituting the communication network, and the larger the total number of the plurality of satellites is, the larger the value of the preset number is.
3. The method of claim 2, wherein upon congestion of a portion of the satellite nodes in the first sub-network or the second sub-network, the congested portion of the satellite nodes simultaneously broadcasts the congested congestion condition to the first sub-network and the second sub-network, and the respective first virtual operating system (110) and the respective second virtual operating system (120) associatively adjust the ordering of the preferred paths from the respective source satellite node to the destination satellite node based at least in part on the received congestion condition.
4. The method of claim 3, wherein the processing of the respective first virtual operating system (110) and the respective second virtual operating system (120) to adjust the ordering of the preferred paths from the respective source satellite node to the destination satellite node associatively depending at least in part on the received congestion condition comprises:
confirming the congested satellite nodes and the congested sub-networks according to the congestion condition;
the ordering of the preferred paths from the satellite node receiving the broadcast to the destination satellite node in the non-congested subnetwork is adjusted at least partially in dependence on the congestion situation and the first ordering result to obtain a second ordering result after the ordering of the preferred paths from the satellite node receiving the broadcast to the destination satellite node in the congested subnetwork is adjusted at least partially in dependence on the congestion situation to obtain a first ordering result.
5. The method of claim 4, wherein the communication network is comprised of a first constellation of satellites operating in a first orbital layer and a second constellation of satellites operating in a second orbital layer;
the corresponding first virtual operating system (110) and the corresponding second virtual operating system (120) are configured to enable one of the first virtual operating system (110) and the second virtual operating system (120) arranged on the same satellite to preferentially select a neighboring satellite with a path bypassing the congestion in the same orbit layer for communication according to the congestion condition of the neighboring satellite of the satellite where the one satellite is arranged, and the other of the first virtual operating system (110) and the second virtual operating system (120) arranged on the same satellite to preferentially select a cross path of an adjacent orbit layer for bypassing the neighboring satellite with the congestion according to the congestion condition of the neighboring satellite of the satellite where the one satellite is arranged.
6. The method of claim 5, wherein the method further comprises:
receiving, by at least one satellite node in the first constellation and/or the second constellation, a ring link profile transmitted by a ground station (200),
a first constellation and a second constellation of a number of ring links periodically established in a local area within a communication network according to said ring link profile and each ring link being made up of at least three satellite nodes,
when congestion occurs in one communication direction of a ring link, communication is preferentially attempted in a reverse communication direction (320) of the ring link, which is opposite to the communication direction, and data is transmitted by switching the sub-network for transmitting the data only when congestion still exists in the reverse communication direction (320).
7. The method of claim 6, wherein a plurality of satellites comprising the communication network periodically update the routing table according to a ring link profile to establish a plurality of ring links that periodically change.
8. The method according to claim 7, characterized in that all the satellites composing the communication network, when transferring data to the ground station (200), also associatively transmit the data to the ground station (200) via the satellite number, the transit time and the transit position of each satellite, that the ground station (200) analyzes the hot spot paths associated with time at the constellation composing the communication network according to the satellite numbers, the transit time and the transit position, that the ground station (200) also analyzes the position regularity of each satellite according to the received orbital parameters of the satellites, that the ground station (200) clusters into a first cluster the satellites having a position regularity and maintaining the position regularity for at least a preset number of regular cycles according to the position regularity information, and then clusters into a second cluster the satellites visible during the periodic period in the first cluster according to the visibility period, and then constructing a ring link configuration file according to the second clusters and the cycle time period associated with each second cluster.
9. The method of claim 8, wherein network traffic is routed to the destination satellite node using the reverse communication direction (320) or the forward communication direction (310) based at least on status information of the communication network indicating that the forward communication direction (310) or the reverse communication direction (320) of the ring links of the communication network is experiencing congestion and/or failure.
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| CN110290066B (en) * | 2019-06-24 | 2021-10-01 | 中国空间技术研究院 | Dynamic routing method of satellite network based on queue monitoring and congestion prediction |
| CN113225241B (en) * | 2021-04-19 | 2022-09-06 | 中国科学院计算技术研究所 | Data transmission congestion control method and system for ring-shaped data message network |
| CN114095971B (en) * | 2022-01-19 | 2022-05-10 | 浙江吉利控股集团有限公司 | Method, system, device, equipment and storage medium for processing communication data packet |
| CN116866160B (en) * | 2023-09-05 | 2023-11-21 | 空间液态金属科技发展(江苏)有限公司 | Design method for improving reliability of spacecraft network system |
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| CN109547095A (en) | 2019-03-29 |
| CN113131996A (en) | 2021-07-16 |
| CN113131995B (en) | 2022-07-29 |
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