CN114916014A - Cross-layer flow control method, device, equipment and medium for civil aircraft air-ground communication - Google Patents

Cross-layer flow control method, device, equipment and medium for civil aircraft air-ground communication Download PDF

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Publication number
CN114916014A
CN114916014A CN202210615797.0A CN202210615797A CN114916014A CN 114916014 A CN114916014 A CN 114916014A CN 202210615797 A CN202210615797 A CN 202210615797A CN 114916014 A CN114916014 A CN 114916014A
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Prior art keywords
flow
link
flow control
bandwidth
control method
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Inventor
徐崇浪
刘毅
辜迎佳
陈华金
彭美康
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CETC Avionics Co Ltd
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CETC Avionics Co Ltd
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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
    • H04W28/10—Flow control between communication endpoints
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/19—Flow control; Congestion control at layers above the network layer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2425—Traffic characterised by specific attributes, e.g. priority or QoS for supporting services specification, e.g. SLA
    • H04L47/2433—Allocation of priorities to traffic types
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/2483—Traffic characterised by specific attributes, e.g. priority or QoS involving identification of individual flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/50—Queue scheduling
    • H04L47/62—Queue scheduling characterised by scheduling criteria
    • H04L47/625—Queue scheduling characterised by scheduling criteria for service slots or service orders
    • H04L47/6275—Queue scheduling characterised by scheduling criteria for service slots or service orders based on priority
    • 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
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

The invention discloses a cross-layer flow control method, a device, equipment and a medium for civil aircraft air-ground communication, wherein the method comprises the following steps: according to a user preset strategy, a link real-time state and service flow statistics, an application layer flow control method is adopted for flow control decision, a link level flow link is selected, and the flow link information is transmitted to a network layer; the method realizes the unified coordination and control of the flow or bandwidth among a plurality of air-ground broadband communication links, and provides the functions of link on-off control, flow distribution based on priority and flow statistics; in the network layer, according to the flow link information, a network layer flow control method is adopted to realize that the service flow transmits data on a certain air-ground transmission link according to the proportion of priority and bandwidth; and realizing the accurate and dynamic flow control of the civil aircraft airborne service flow among a plurality of air-ground broadband communication links by combining the cross-layer flow control of the application layer flow control method and the network layer flow control method at the application layer and the network layer.

Description

Cross-layer flow control method, device, equipment and medium for civil aircraft air-ground communication
Technical Field
The invention relates to the technical field of civil aircraft air-ground communication traffic flow control, in particular to a civil aircraft air-ground communication cross-layer flow control method, device, equipment and medium.
Background
With the rapid evolution of data, information and communication technology related to civil aircraft digitization, a large passenger aircraft is basically provided with a plurality of air-to-ground broadband communication links, such as a shutdown bit data link GateLink, a Ka/Ku waveband guard Ka/Ku, an air-to-ground broadband communication ATG and the like; meanwhile, the air-ground data transmission needs to be carried out in real time on the air-ground data in the flight process of the airplane, such as the air traffic data, the navigation department operation data, the maintenance data, the passenger entertainment data and the like. Therefore, how to better meet the transmission requirements of airborne applications with different priorities and importance under the condition that a civil aircraft is assembled with a plurality of air-to-ground broadband communication links is a problem to be solved urgently.
At present, a flow control method adopted by civil aircraft air-ground communication is generally realized only in a network layer, flow or bandwidth adjustment is carried out on a certain air-ground broadband communication link, and unified coordination and control of the flow or the bandwidth among a plurality of air-ground broadband communication links cannot be realized.
Disclosure of Invention
The technical problem to be solved by the invention is that the flow control method adopted by the existing civil aircraft air-ground communication is generally realized only in a network layer, and flow or bandwidth adjustment is carried out on a certain air-ground broadband communication link, so that unified coordination and control of flow or bandwidth among a plurality of air-ground broadband communication links cannot be realized.
The invention aims to provide a cross-layer flow control method, a device, equipment and a medium for civil aircraft air-ground communication.
The invention is realized by the following technical scheme:
in a first aspect, the invention provides a cross-layer flow control method for civil aircraft air-ground communication, which comprises an application layer and a network layer, realizes fine flow control of six-tuple (including a source IP address, a destination IP address, a source port, a destination port, a protocol and a TOS field) meeting a standard IP message, and can realize dynamic adjustment of flow control by combining the real-time state of each air-ground broadband communication link. The method comprises the following steps:
in the application layer, according to a user preset strategy, a link real-time state and service flow statistics, an application layer flow control method is adopted to make flow control decision, a link-level flow link is selected, and the flow link information is transmitted to a network layer; the method realizes the unified coordination and control of the flow or bandwidth among a plurality of air-ground broadband communication links, and provides the functions of link on-off control, flow distribution based on priority, flow statistics and the like;
in the network layer, according to the flow link information, a service flow is allocated to a corresponding bandwidth of a certain air-ground transmission link and carries key information such as priority and the like; adopting a network layer flow control method to realize that the service flow transmits data on a specific air-ground transmission link according to the proportion of priority and bandwidth;
by combining the cross-layer flow control of the application layer flow control method and the network layer flow control method, the accurate and dynamic flow control of the civil aircraft airborne service flow among a plurality of air-to-ground broadband communication links is realized, and the requirements (QOS) of various airborne service flows with different priorities and different importance on the air-to-ground communication transmission quality of service are well met.
Furthermore, the user preset strategy is to allow a user to finely define the QOS requirement of each service flow for a standard IP packet, and includes a lowest transmission bandwidth, whether to monopolize transmission, and a transmission priority;
the standard IP packet is a six-tuple that includes the source IP address, destination IP address, source port, destination port, protocol, and TOS fields.
Further, the link real-time state includes an available state, an effective physical bandwidth, a logical bandwidth, a packet loss rate, a utilization rate, and the like of each link;
the service flow statistics comprise a transmission state, a bandwidth allocation state, a bandwidth usage state, a speed limit state and the like.
Further, the application layer flow control method comprises service flow initial allocation, wherein the service flow initial allocation is a scene of firstly applying bandwidth for air-ground data transmission aiming at a certain on-board service flow;
the initial allocation of the service flow comprises the following substeps:
acquiring user preset strategy parameters and real-time states of all links;
judging whether available links exist according to the user preset strategy parameters and the real-time states of all the links; if the available link exists, continuously judging whether the available link is monopolized by the airborne service flow with higher priority; if no available link exists, ending the initial allocation of the service flow and informing the strip machine of applying for the service flow later;
continuing to determine whether the available link is monopolized by a higher priority airborne traffic flow: if the available link is not monopolized by the airborne service flow with higher priority, continuously judging whether the residual logic bandwidth meets the requirement; if the available link is monopolized by the airborne service flow with higher priority, finishing the initial allocation of the service flow, and informing the machine of applying for the airborne service flow later;
and continuously judging whether the residual logic bandwidth meets the requirement: if the residual logic bandwidth meets the requirement, applying bandwidth to the strip machine service stream pair for data transmission; if the residual logic bandwidth does not meet the requirement, the initial allocation of the service flow is finished, and the strip-mounted service flow is informed to apply later.
Further, the application layer flow control method further comprises dynamic service flow adjustment, wherein the dynamic service flow adjustment is to periodically and dynamically adjust all the airborne service flows which have successfully obtained the bandwidth according to the real-time state of the system, comprehensively consider key influence factors, and decide whether to adjust the transmission bandwidth of the related service flow according to the key influence factors;
the dynamic adjustment of the service flow comprises the following substeps:
acquiring the updating condition of key influence factors, wherein the key influence factors comprise an airplane state, a link real-time state and a service flow state;
according to the updating condition of the key influence factors, if at least one of the key influence factors is updated, triggering dynamic adjustment of the traffic flow, and sequentially adjusting the airborne traffic flow with the acquired bandwidth; collecting relevant real-time states and waiting for entering the next decision period; the order of judging the updating condition of the key influence factors can be carried out according to whether the state of the airplane is updated or not, whether the state of the link is updated or not and whether the state of the service flow is updated or not;
and according to the updating conditions of the key influence factors, if none of the updating conditions of the key influence factors is updated, directly collecting relevant real-time states, and waiting for entering the next decision period.
Further, the airplane state comprises an airplane wheel load state, a flight stage, longitude and latitude and the like;
the link real-time state comprises the on-off condition of each link, the average flow of the link, the average packet loss rate of the link and the like;
the service flow state comprises the average speed, the real-time speed, the overtime condition and the like of the traffic flow carried by each strip.
Furthermore, the network layer flow control method is that a plurality of sending queues are designed based on the relevant ports of each air-ground transmission link, different sending queues correspond to different priorities, and each sending queue is designed with different bandwidth proportions; and the related configuration can be flexibly adjusted according to the actual application scene;
the sending queues adopt queues built by a kernel tool, and the data forwarding priority of each sending queue is sequentially decreased; link bandwidth can be shared among all sending queues, and if only one airborne service flow exists, all link bandwidth can be occupied; and each sending queue preempts idle bandwidth according to the proportion of the allocated upper limit bandwidth.
In a second aspect, the invention further provides a civil aircraft air-ground communication cross-layer flow control device, which supports the civil aircraft air-ground communication cross-layer flow control method; the device comprises:
the application layer flow control unit is used for carrying out flow control decision by adopting an application layer flow control method according to a user preset strategy, a link real-time state and service flow statistics on an application layer, selecting a link-level flow link and transmitting the flow link information to a network layer; the method realizes the unified coordination and control of the flow or bandwidth among a plurality of air-ground broadband communication links, and provides the functions of link on-off control, flow distribution based on priority and flow statistics;
a network layer flow control unit, configured to allocate, at a network layer, a service flow to a corresponding bandwidth of a certain air-ground transmission link according to the flow link information, and carry priority key information; adopting a network layer flow control method to realize that the service flow transmits data on a certain air-ground transmission link according to the proportion of priority and bandwidth;
and the cross-layer flow control of the application layer flow control unit and the network layer flow control unit on the application layer and the network layer is combined, so that the accurate and dynamic flow control of the civil aircraft airborne service flow among a plurality of air-to-ground broadband communication links is realized.
In a third aspect, the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the processor implements the cross-layer flow control method for air-ground communication of civil aircraft.
In a fourth aspect, the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the cross-layer flow control method for air-ground communication in civil engineering.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention solves the problem of accurate and dynamic Flow control of various airborne business flows of civil aircrafts among a plurality of air-ground broadband communication links by adopting cross-layer cooperative Flow control of an application layer and a network layer at an airborne end of the civil aircrafts air-ground communication, automatically identifies the priority of each business Flow (Flow) at an air-ground communication management service end, realizes accurate Flow control of six-tuple (source IP address, destination IP address, source port, destination port, protocol and TOS field) granularity based on a standard IP message header, and combines a dynamic adjustment algorithm, thereby realizing the maximization of the total capacity of transmission bandwidth.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic diagram of a cross-layer flow control layering function of a civil aircraft air-ground communication cross-layer flow control method of the present invention.
Fig. 2 is a schematic cross-layer flow control process diagram of a civil aircraft air-ground communication cross-layer flow control method of the present invention.
Fig. 3 is a schematic flow chart of an application layer flow control method of the civil aircraft air-ground communication cross-layer flow control method of the present invention.
Fig. 4 is a flow chart of initial allocation of service traffic according to the application layer traffic control method of the present invention.
Fig. 5 is a flow chart of dynamic adjustment of service traffic by the application layer traffic control method of the present invention.
FIG. 6 is a diagram illustrating a network layer queue design according to the present invention.
Fig. 7 is a sub-flowchart of the dynamic adjustment of service traffic according to the application layer traffic control method of the present invention.
Fig. 8 is a schematic structural diagram of a civil aircraft air-ground communication cross-layer flow control device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The flow control method adopted by the existing civil aircraft air-ground communication is generally realized only in a network layer, and flow or bandwidth adjustment is carried out on a certain air-ground broadband communication link, so that unified coordination and control of the flow or bandwidth among a plurality of air-ground broadband communication links cannot be realized. The invention designs a cross-layer flow control method for civil aircraft air-ground communication, which realizes refined and dynamic flow control of various airborne service flows among a plurality of air-ground broadband communication links by adopting cross-layer cooperative flow control of an application layer and a network layer at an airborne end of the civil aircraft air-ground communication. As shown in fig. 1.
The cross-layer flow control method for civil aircraft air-ground communication adopts a cross-layer flow control mechanism, comprises an application layer and a network layer, realizes the fine flow control of six-tuple (comprising a source IP address, a destination IP address, a source port, a destination port, a protocol and a TOS field) meeting the standard IP message, and can realize the dynamic adjustment of flow control by combining the real-time state of each air-ground broadband communication link, as shown in figure 2.
As shown in fig. 1, the cross-layer flow control method for air-ground communication of civil aircraft of the present invention includes an application layer and a network layer, realizes fine flow control of six-tuple (including source IP address, destination IP address, source port, destination port, protocol and TOS field) satisfying a standard IP packet, and can realize dynamic adjustment of flow control by combining with the real-time status of each air-ground broadband communication link. The method comprises the following steps:
in the application layer, according to a user preset strategy, a link real-time state and service flow statistics, an application layer flow control method is adopted to make flow control decision, a link-level flow link is selected, and the flow link information is transmitted to a network layer; the method realizes the unified coordination and control of the flow or bandwidth among a plurality of air-ground broadband communication links, and provides the functions of link on-off control, flow distribution based on priority, flow statistics and the like; meanwhile, the flow control can be dynamically adjusted according to the real-time statistical data reported by the system, as shown in fig. 3.
In the network layer, according to the flow link information, a service flow is allocated to a corresponding bandwidth of a certain air-ground transmission link and carries key information such as priority and the like; adopting a network layer flow control method to realize that the service flow transmits data on a specific air-ground transmission link according to the proportion of the priority and the bandwidth;
by combining the cross-layer flow control of the application layer flow control method and the network layer flow control method, the accurate and dynamic flow control of the civil aircraft airborne service flow among a plurality of air-to-ground broadband communication links is realized, and the requirements (QOS) of various airborne service flows with different priorities and different importance on the air-to-ground communication transmission quality of service are well met.
In this embodiment, the application layer traffic control method mainly takes the user preset policy, the link real-time status, the traffic flow statistics, and the like as input variables of the traffic control method to make final decisions.
The user preset strategy (see table 1) is to allow a user to finely define the QOS requirement of each service flow aiming at a standard IP message, and comprises the lowest transmission bandwidth, whether to monopolize transmission and the transmission priority; the standard IP packet is a six-tuple that includes the source IP address, destination IP address, source port, destination port, protocol, and TOS fields.
Wherein, IP (internet protocol) is internet protocol, tos (type Of service) is service type, qos (quality Of service) is service quality, Flow is service Flow, and remark adopts hexahydric group in IP message header as identification basis.
In this embodiment, the link real-time status includes an available status, an effective physical bandwidth, a logical bandwidth, a packet loss rate, a utilization rate, and the like of each link;
the service flow statistics comprise a transmission state, a bandwidth allocation state, a bandwidth usage state, a speed limit state and the like.
In addition, in order to achieve more refined Flow control, six tuples (source IP address, destination IP address, source port, destination port, protocol and TOS field) in the standard IP header are subdivided into a single traffic Flow (Flow) according to the Flow, and the air-to-ground communication management server can automatically identify the priority of each traffic Flow (Flow), as shown in table 1 below:
TABLE 1 user Preset policy Table
Figure BDA0003674240640000061
In this embodiment, the application layer flow control method mainly includes two sub-processes: and (4) initial allocation of service flow and dynamic adjustment of the service flow.
Specifically, the initial allocation of the service traffic is a scene in which bandwidth is first applied for air-to-ground data transmission for a certain on-board service traffic; as shown in fig. 4, the initial allocation of the traffic flow includes the following sub-steps:
acquiring user preset strategy parameters and real-time states of all links;
judging whether available links exist according to the user preset strategy parameters and the real-time states of all the links; if the available link exists, continuously judging whether the available link is monopolized by the airborne service flow with higher priority; if no available link exists, ending the initial allocation of the service flow and informing the strip machine of applying for the service flow later;
continuing to determine whether the available link is monopolized by a higher priority airborne traffic flow: if the available link is not monopolized by the airborne service flow with higher priority, continuously judging whether the residual logic bandwidth meets the requirement; if the available link is exclusively occupied by the airborne service flow with higher priority, finishing the initial allocation of the service flow, and informing the airborne service flow to apply later;
and continuously judging whether the residual logic bandwidth meets the requirement: if the residual logic bandwidth meets the requirement, applying bandwidth to the strip onboard service flow pair for data transmission; if the residual logic bandwidth does not meet the requirement, the initial allocation of the service flow is finished, and the strip-mounted service flow is informed to apply later.
As shown in fig. 4, the initial allocation sub-process of the service traffic will comprehensively consider factors such as a user preset policy, a link real-time status, and a service flow transmission requirement, and allocate a suitable transmission bandwidth for a certain strip of the onboard service flow.
If the link state is unavailable, the link bandwidth is monopolized, the remaining logical bandwidth is insufficient, and the like, the initial traffic allocation is failed and the traffic flow is notified to be applied again later.
The service flow uses a logic bandwidth instead of a physical bandwidth during initial allocation, and mainly considers that in the actual transmission process, after each service flow obtains the allocated bandwidth, the application of the bandwidth upper limit for transmitting data is not always kept. If the initial flow of the service flow is distributed according to the physical bandwidth, the utilization rate of the link bandwidth is not high enough. Therefore, the logical bandwidth is adopted for flow distribution, the distribution bandwidth can be larger than the physical bandwidth, and the size of the logical bandwidth is dynamically adjusted according to the real-time state (transmission delay, packet loss rate and the like) of the link, so that the maximization of the total capacity of the transmission bandwidth is realized.
Specifically, the dynamic adjustment of the service traffic is to periodically and dynamically adjust all the airborne service flows which have successfully obtained the bandwidth according to the real-time state of the system, comprehensively consider key influence factors, and decide whether to adjust the transmission bandwidth of the related service traffic according to the key influence factors; as shown in fig. 5.
As shown in fig. 7, the dynamic adjustment of the traffic flow includes the following sub-steps:
acquiring the updating condition of key influence factors, wherein the key influence factors comprise an airplane state, a link real-time state and a service flow state;
according to the updating condition of the key influence factors, if at least one of the key influence factors is updated, triggering dynamic adjustment of the traffic flow, and sequentially adjusting the airborne traffic flow with the acquired bandwidth; collecting relevant real-time states and waiting for entering the next decision period; the order of judging the updating condition of the key influence factors can be carried out according to whether the state of the airplane is updated or not, whether the state of the link is updated or not and whether the state of the service flow is updated or not;
and according to the updating conditions of the key influence factors, if none of the updating conditions of the key influence factors is updated, directly collecting the relevant real-time state, and waiting for entering the next decision period.
In this embodiment, the aircraft state includes an aircraft wheel load state, a flight phase, longitude and latitude, and the like; these parameters will directly affect whether certain air-to-ground communication links are available, such as to avoid interfering with the traffic signals, to prohibit the use of ATG links during critical flight phases, etc.;
the link real-time state comprises the on-off condition of each link, the average flow of the link, the average packet loss rate of the link and the like;
the traffic flow state includes the average rate, real-time rate and timeout condition of the traffic flow carried by each strip.
In this embodiment, the network layer traffic control method mainly implements that a service flow transmits data on a specific air-to-ground transmission link according to a priority and bandwidth ratio. Through application layer flow control, a service flow is allocated to a corresponding bandwidth of a certain air-to-ground transmission link and carries key information such as priority and the like, wherein the priority of the service flow is mainly judged according to TOS (transmitter optical system), namely the higher the numerical value of TOS is, the higher the priority is. When the service flow enters the network layer, the next flow control is carried out.
The network layer flow control method is that a plurality of sending queues are designed based on the relevant ports of each air-ground transmission link, different sending queues correspond to different priorities, and each sending queue is designed with different bandwidth proportions; and the related configuration can be flexibly adjusted according to the actual application scene; as shown in fig. 6.
The network layer flow control mechanism not only ensures the priority of the service flow, but also can utilize the bandwidth of the link to the maximum extent. When the link is congested, different queues can be ensured to normally forward data according to the proportion; when the link is idle, the airborne service flow is allowed to break through the upper limit of the bandwidth proportion, and even the whole link bandwidth is occupied.
The transmission queue of the network layer is designed by adopting a kernel tool to build the queue, so that the execution efficiency is high, the function is more stable and reliable, and the performance of Gbit-level flow control can be ensured. The network layer transmission queue has the following characteristics:
the data forwarding priority of each sending queue is decreased in sequence;
link bandwidth can be shared among all sending queues, and if only one airborne service flow exists, all link bandwidth can be occupied;
and each sending queue preempts idle bandwidth according to the proportion of the allocated upper limit bandwidth.
In conclusion, the flow control method realizes the accurate and dynamic flow control of the civil aircraft airborne service flow among the plurality of air-to-ground broadband communication links through the respective functions and cooperative cooperation of the application layer and the network layer, and well meets the requirements of various air-to-ground communication transmission quality of service (QOS) of the airborne service flow with different priorities and different importance.
Example 2
As shown in fig. 8, the present embodiment is different from embodiment 1 in that the present embodiment further provides a civil aircraft air-ground communication cross-layer flow control device, which supports the civil aircraft air-ground communication cross-layer flow control method described in embodiment 1; the device includes:
the application layer flow control unit is used for carrying out flow control decision by adopting an application layer flow control method according to a user preset strategy, a link real-time state and service flow statistics on an application layer, selecting a link-level flow link and transmitting the flow link information to a network layer; the method realizes the unified coordination and control of the flow or bandwidth among a plurality of air-ground broadband communication links, and provides the functions of link on-off control, flow distribution based on priority and flow statistics;
a network layer flow control unit, configured to allocate, at a network layer, a service flow to a corresponding bandwidth of a certain air-to-ground transmission link according to the flow link information, and carry priority key information; adopting a network layer flow control method to realize that the service flow transmits data on a certain air-ground transmission link according to the proportion of priority and bandwidth;
and by combining the cross-layer flow control of the application layer flow control unit and the network layer flow control unit on the application layer and the network layer, the accurate and dynamic flow control of the civil aircraft airborne service flow among a plurality of air-to-ground broadband communication links is realized.
The execution process of each unit is executed according to the flow steps of the cross-layer flow control method for civil aircraft air-ground communication described in embodiment 1, and details are not repeated in this embodiment.
Meanwhile, the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the processor realizes the cross-layer flow control method for civil air-ground communication when executing the computer program.
Meanwhile, the invention also provides a computer readable storage medium, which stores a computer program, and the computer program realizes the cross-layer flow control method of civil aircraft air-ground communication when being executed by a processor.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A cross-layer flow control method for civil aircraft air-ground communication is characterized by comprising the following steps:
in the application layer, according to a user preset strategy, a link real-time state and service flow statistics, an application layer flow control method is adopted to make flow control decision, a link-level flow link is selected, and the flow link information is transmitted to a network layer; the method realizes the unified coordination and control of the flow or bandwidth among a plurality of air-ground broadband communication links, and provides the functions of link on-off control, flow distribution based on priority and flow statistics;
in the network layer, according to the flow link information, a service flow is allocated to a corresponding bandwidth of a certain air-ground transmission link and carries priority key information; adopting a network layer flow control method to realize that the service flow transmits data on a certain air-ground transmission link according to the proportion of priority and bandwidth;
and realizing the accurate and dynamic flow control of the civil aircraft airborne service flow among a plurality of air-ground broadband communication links by combining the cross-layer flow control of the application layer flow control method and the network layer flow control method at the application layer and the network layer.
2. The cross-layer flow control method for civil aircraft air-ground communication according to claim 1, wherein the user preset strategy is to define the QOS requirement of each service flow in a user-refined manner for a standard IP packet, and the user preset strategy includes a lowest transmission bandwidth, whether to monopolize transmission and a transmission priority;
the standard IP packet is a six-tuple that includes the source IP address, destination IP address, source port, destination port, protocol, and TOS fields.
3. The cross-layer flow control method for civil aircraft air-ground communication according to claim 1, wherein the link real-time status includes each link available status, effective physical bandwidth, logical bandwidth, packet loss rate and utilization rate;
the service flow statistics comprise a transmission state, a distribution bandwidth, a use bandwidth and a speed limit state.
4. The cross-layer flow control method for civil aircraft air-ground communication according to claim 1, characterized in that the application layer flow control method comprises initial allocation of traffic flow, wherein the initial allocation of traffic flow is a scene of first applying for bandwidth for air-ground data transmission for a certain on-board traffic flow;
the initial allocation of the service flow comprises the following substeps:
acquiring user preset strategy parameters and real-time states of all links;
judging whether available links exist according to the user preset strategy parameters and the real-time states of all links; if the available link exists, continuously judging whether the available link is monopolized by the airborne service flow with higher priority; if no available link exists, ending the initial allocation of the service flow and informing the strip machine of applying for the service flow later;
continuing to determine whether the available link is monopolized by a higher priority airborne traffic flow: if the available link is not monopolized by the airborne service flow with higher priority, continuously judging whether the residual logic bandwidth meets the requirement; if the available link is exclusively occupied by the airborne service flow with higher priority, finishing the initial allocation of the service flow, and informing the airborne service flow to apply later;
and continuously judging whether the residual logic bandwidth meets the requirement: if the residual logic bandwidth meets the requirement, applying bandwidth to the strip onboard service flow pair for data transmission; if the residual logic bandwidth does not meet the requirement, the initial allocation of the service flow is finished, and the strip-mounted service flow is informed to apply later.
5. The cross-layer flow control method for civil aircraft air-ground communication according to claim 4, characterized in that the application layer flow control method further comprises dynamic adjustment of service flow, wherein the dynamic adjustment of service flow is to periodically and dynamically adjust all the airborne service flows which have successfully acquired bandwidth according to the real-time state of the system, comprehensively consider key influencing factors, and decide whether to adjust the transmission bandwidth of the relevant service flow according to the key influencing factors;
the dynamic adjustment of the service flow comprises the following substeps:
acquiring the updating condition of key influence factors, wherein the key influence factors comprise an airplane state, a link real-time state and a service flow state;
according to the updating condition of the key influence factors, if at least one influence factor is updated in the updating condition of the key influence factors, triggering dynamic adjustment of the service flow control, and sequentially adjusting the airborne service flow with the acquired bandwidth; collecting relevant real-time states and waiting for entering the next decision period;
and according to the updating conditions of the key influence factors, if none of the updating conditions of the key influence factors is updated, directly collecting the relevant real-time state, and waiting for entering the next decision period.
6. The cross-layer flow control method for civil aircraft air-ground communication according to claim 5, wherein the aircraft state comprises an aircraft wheel load state, a flight phase and latitude and longitude;
the link real-time state comprises the on-off condition of each link, the average link flow and the average link packet loss rate;
the traffic state includes the average rate, real-time rate and timeout condition of traffic carried by each strip.
7. The cross-layer flow control method for civil aircraft air-ground communication according to claim 1, characterized in that the network layer flow control method is that a plurality of sending queues are designed based on the relevant ports of each air-ground transmission link, different sending queues correspond to different priorities, and each sending queue is designed with different bandwidth proportions; and the related configuration can be flexibly adjusted according to the actual application scene;
the sending queues adopt queues built by a kernel tool, and the data forwarding priority of each sending queue is sequentially decreased; sharing link bandwidth among all sending queues; and each sending queue preempts idle bandwidth according to the proportion of the allocated upper limit bandwidth.
8. A civil aircraft air-ground communication cross-layer flow control device, characterized in that the device supports a civil aircraft air-ground communication cross-layer flow control method according to any one of claims 1 to 7; the device includes:
the application layer flow control unit is used for carrying out flow control decision by adopting an application layer flow control method according to a user preset strategy, a link real-time state and service flow statistics on an application layer, selecting a link-level flow link and transmitting the flow link information to a network layer; the method realizes the unified coordination and control of the flow or bandwidth among a plurality of air-ground broadband communication links, and provides the functions of link on-off control, flow distribution based on priority and flow statistics;
a network layer flow control unit, configured to allocate, at a network layer, a service flow to a corresponding bandwidth of a certain air-to-ground transmission link according to the flow link information, and carry priority key information; adopting a network layer flow control method to realize that the service flow transmits data on a certain air-ground transmission link according to the proportion of priority and bandwidth;
and by combining the cross-layer flow control of the application layer flow control unit and the network layer flow control unit on the application layer and the network layer, the accurate and dynamic flow control of the civil aircraft airborne service flow among a plurality of air-to-ground broadband communication links is realized.
9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements a method of cross-layer flow control for civil air-ground communication according to any of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, implements a method for cross-layer flow control in civil aircraft air-ground communication according to any one of claims 1 to 7.
CN202210615797.0A 2022-06-01 2022-06-01 Cross-layer flow control method, device, equipment and medium for civil aircraft air-ground communication Pending CN114916014A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116614449A (en) * 2023-07-19 2023-08-18 中国电子科技集团公司第二十九研究所 Application layer-oriented self-adaptive flow control device and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116614449A (en) * 2023-07-19 2023-08-18 中国电子科技集团公司第二十九研究所 Application layer-oriented self-adaptive flow control device and method
CN116614449B (en) * 2023-07-19 2023-10-31 中国电子科技集团公司第二十九研究所 Application layer-oriented self-adaptive flow control device and method

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