CN115987879B - Low-delay image transmission system and method based on software defined network - Google Patents
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Abstract
The invention discloses a low-delay image transmission system and a method based on a software defined network, wherein a low-delay transmission control device determines a candidate link sequence which minimizes the packet loss in the transmission process of image data so as to determine a target network state, and controls the image data transmission network to be converted into the target network state from the current network state so as to realize the transmission of the image data.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a low latency image transmission system and method based on a software defined network.
Background
The software defined network (Software Defined Network, SDN) is a novel network innovation architecture, is an implementation mode of network virtualization, can define and control the network in a software programming mode, and has the characteristics of data plane and control plane separation and openness programmability.
The data transmission system based on the software defined network can be suitable for various application scenes, and is beneficial to the reliability of the data transmission system in the data transmission process.
Patent CN105337857B discloses a method and a system for implementing interconnection of multiple network devices based on a software-defined network, where a software-defined network switch receives a forwarding flow table and generates an interconnection forwarding path, so that a forwarding flow table can be matched for a data packet sent by the network device to be interconnected according to the forwarding flow table, and the successfully matched data packet is forwarded through the interconnection forwarding path, thereby implementing interconnection of the multiple network devices.
Patent CN107294960B discloses a method for guaranteeing the security of a control channel of a software-defined network, which guarantees the security of the control channel of the software-defined network by a quantum key layer deployed between a control layer and a data layer of the software-defined network.
In the data transmission process, besides the requirements of transmission objects, matching of transmission information and security verification of transmission, the requirements of low-delay are often required to be met, and in particular, in the fields of automatic driving, image recognition and the like, the requirements of low-delay image transmission are clear.
Therefore, how to develop a low-latency image transmission system (and method) based on a software-defined network is a technical problem to be solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-delay image transmission system and a low-delay image transmission method based on a software defined network, which are beneficial to meeting the low-delay requirement of image transmission.
In order to solve the technical problem, a first aspect of the present invention discloses a low-latency image transmission system based on a software defined network, where the low-latency image transmission system is provided with a low-latency transmission control device, the low-latency transmission control device is configured to control an image data transmission network of the low-latency image transmission system to operate, and the low-latency transmission control device performs the following steps:
the low-delay transmission device determines the current network state according to the current routing table of the image data transmission network at the current stage;
the low-delay transmission device determines a transmission link sequence which minimizes the packet loss in the transmission process of the image data as a candidate transmission link sequence;
the low-delay transmission device determines a target network state according to the candidate transmission link sequence;
the low-delay transmission device controls the image data transmission network to be changed from the current network state to the target network state, so that the image data to be transmitted is transmitted in the image data transmission network based on a data stream corresponding to the target state.
In the low-latency image transmission system based on the software defined network disclosed in the first aspect of the present invention, the low-latency transmission control device determines a candidate link sequence that minimizes the packet loss amount in the transmission process of the image data, so as to determine the target network state, and controls the image data transmission network to be converted from the current network state to the target network state, so as to realize the transmission of the image data, and by minimizing the packet loss amount in the transmission process, the latency caused by the retransmission of the data in the image transmission process is reduced, thereby reducing the total latency in the image transmission process, and being beneficial to meeting the low-latency requirement of the image transmission.
In an optional implementation manner, in a first aspect of the present invention, the low-latency transmission device determines, as a candidate transmission link sequence, a transmission link sequence that minimizes a packet loss amount in a transmission process of image data, including:
the low-delay transmission device determines a transmission link sequence which minimizes the packet loss amount in the transmission process of the image data as a candidate transmission link sequence according to attribute information of the image data to be transmitted and a predetermined transmission link utilization rate.
As an optional implementation manner, in the step of determining, by the low-latency transmission device, that the transmission link sequence that minimizes the packet loss amount in the transmission process of the image data is the candidate transmission link sequence according to the attribute information of the image data to be transmitted and the predetermined transmission link utilization, the low-latency transmission device determines, by a network congestion minimizing algorithm, that the transmission link sequence that minimizes the packet loss amount in the transmission process of the image data is the candidate transmission link sequence, wherein the process of determining, by the network congestion minimizing algorithm, the candidate transmission link sequence is as follows:
knowing that the utilization rates of the transmission links applicable to the image data to be transmitted in the image data transmission network are equal, the packet loss quantization index value T of each data stream f on all loop-free paths in the end-to-end transmission direction of the image data to be transmitted is calculated:
T＝W f l fs-fs ′+b fs-fs ′
wherein, I fs-fs′ Representing the migration of a data flow f from a current stage network state s to a predicted next stage network state s ′ Flow value, W, limited in the process of (2) f Representing the migration of a limited traffic value from the current stage network state s to the predicted next stage network state s for the data flow f ′ Coefficient of influence in the process of b fs-fs′ Representing the transition of a data flow f from a current stage network state s to a predicted next stage network state s ′ The amount of direct deviation in the process of (2);
and generating a candidate transmission link sequence based on the data stream set which is obtained by screening and enables the total number of the packet loss quantization index values to be minimum.
In an optional implementation manner, in a first aspect of the present invention, the determining, by the low latency transmission device, a target network state according to the candidate transmission link sequence specifically includes:
the low-delay transmission device determines a target routing table at the next stage according to the candidate transmission link sequence;
and the low-delay transmission device determines the state of the target network according to the target routing table of the next stage.
As an optional implementation manner, in the first aspect of the present invention, after the low-latency transmission apparatus determines, according to the candidate transmission link sequence, a target routing table at a next stage, and before the low-latency transmission apparatus determines, according to the target routing table at the next stage, a target network state, the method further includes
The low-latency transmission means determines whether the target routing table of the next stage is unique,
if yes, executing the operation of determining the state of the target network according to the target routing table of the next stage;
if not, the low-delay transmission device screens out a target routing table of the next stage with the minimum network state transition complexity;
and the low-delay transmission device determines the state of the target network according to the target routing table of the next stage indicated by the screening result.
The second aspect of the invention discloses a low-delay image transmission method based on a software defined network, which is applied to the low-delay image transmission system based on the software defined network disclosed in the first aspect of the invention.
Therefore, in the low-latency image transmission method based on the software defined network disclosed in the second aspect of the present invention, the low-latency transmission control device determines the candidate link sequence that minimizes the packet loss in the image data transmission process, so as to determine the target network state, and controls the image data transmission network to be converted from the current network state to the target network state, so as to realize the image data transmission.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a low-latency image transmission system based on a software defined network according to an embodiment of the present invention;
fig. 2 is a flowchart of a low latency transmission control apparatus according to an embodiment of the present invention performing control steps;
FIG. 3 is a schematic diagram of the topology of the image data transmission network of the present invention;
fig. 4 is a flowchart of a sub-step of step S103 shown in fig. 2.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms first, second and the like in the description and in the claims, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, article, or device that comprises a list of steps or elements is not limited to the list of steps or elements but may, in the alternative, include other steps or elements not expressly listed or inherent to such process, method, article, or device.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Fig. 1 shows a low-latency image transmission system based on a software defined network according to a first aspect of the present invention, where the low-latency image transmission system is provided with a low-latency transmission control device, and the low-latency transmission control device is configured to control an image data transmission network of the low-latency image transmission system to operate, where, as shown in fig. 2, the low-latency transmission control device performs the following steps.
S101, the low-delay transmission device determines the current network state according to the current routing table of the image data transmission network at the current stage.
S102, the low-delay transmission device determines a transmission link sequence which minimizes the packet loss in the transmission process of the image data as a candidate transmission link sequence.
Optionally, in step S102, the low-delay transmission device may determine, according to attribute information of the image data to be transmitted and a predetermined transmission link utilization, a transmission link sequence that minimizes a packet loss amount in a transmission process of the image data as a candidate transmission link sequence. The attribute information of the image data to be transmitted may include the total amount of data flow of the image data and the end-to-end transmission direction of the image data. In particular, when the available bandwidth of the transmission link is greater than or equal to the total data flow of the image data to be transmitted, network congestion will not occur (i.e. the packet loss of each transmission link is at a minimum), and at this time, the transmission link sequence in which the network can realize the image data transmission can be used as the candidate transmission link sequence. In addition, when the available bandwidth of the transmission link is smaller than the total data flow of the image data to be transmitted, network congestion will inevitably occur, and at this time, it is necessary to screen the transmission link sequence to ensure that the candidate transmission link sequence is a transmission link sequence that minimizes the packet loss during the transmission of the image data. In order to more clearly describe the process of determining the candidate transmission link sequence by the low-latency apparatus according to the attribute information of the image data to be transmitted and the predetermined transmission link utilization, a related example will be described with reference to the network topology diagram shown in fig. 3. As shown in fig. 3, the image data transmission network is composed of S 1 To S 5 In the figure, (a), (b), (c), (d), (e), (f) are part of the network states that may occur during the transmission of image data from left to right, wherein three indivisible data streams f are involved during the transmission of image data 1 、f 2 、f 3 . Assuming that the link utilization rates of the transmission links are the same, the traffic size of each data stream is n, and the bandwidth of each link in the network is m and m<n, then, packet loss K of transmission link in each network stateCan be expressed as:
K＝F·(n-m)
where F represents the total number of links of transmission links through which the data stream of image data passes.
It can be seen that the packet loss K in the network state shown in (d) is the smallest, i.e. the candidate transmission link sequence can be determined as the first data flow f in (d) 1 Through link S 1 -S 2 、S 2 -S 3 The method comprises the steps of carrying out a first treatment on the surface of the First data stream f 2 Through link S 1 -S 4 Third data stream f 3 Through link S 4 -S 3 。
It will be appreciated that in an application scenario, the relationship between bandwidth and traffic of a data stream is not necessarily the central factor in determining candidate transmission link sequences. In order to reasonably utilize the link bandwidth in the network topology and to perform customized screening on the links to determine the candidate transmission link sequence more efficiently, further optionally, the low-latency transmission device determines, according to the attribute information of the image data to be transmitted and the predetermined transmission link utilization, that the transmission link sequence that minimizes the packet loss amount in the transmission process of the image data is the candidate transmission link sequence, and in the step of determining, by using the low-latency transmission device, that the transmission link sequence that minimizes the packet loss amount in the transmission process of the image data is the candidate transmission link sequence. Specifically, the process of determining the candidate transmission link sequence by the network congestion minimization algorithm is as follows:
first, knowing that the utilization rates of the respective transmission links applied to the image data to be transmitted in the image data transmission network are equal, the packet loss quantization index value T of each data stream f on all loop-free paths in the end-to-end transmission direction of the image data to be transmitted is found:
T＝W f l fs-fs ′+b fs-fs ′
wherein, I fs-fs′ Representing the migration of a data flow f from a current stage network state s to a predicted next stage network state s ′ Flow value, W, limited in the process of (2) f Representing the flow value being restricted forThe data flow f transitions from the current stage network state s to the predicted next stage network state s ′ Coefficient of influence in the process of b fs-fs′ Representing the transition of the data flow f from the current stage network state s (i.e. the current network state) to the predicted next stage network state s ′ The direct deviation amount in the process of (i.e., the target network state) may alternatively represent the deviation amount generated by other factors than the limited traffic value or the deviation amount of the packet loss amount on the data flow path determined according to the application scenario requirements.
And generating a candidate transmission link sequence based on the data stream set which is obtained through screening and enables the total number of the packet loss quantization index values to be the minimum, wherein the total number of the packet loss quantization index values is the sum of the packet loss quantization index values corresponding to all data streams in the image data transmission process.
S103, the low-delay transmission device determines the state of the target network according to the candidate transmission link sequence.
After determining the candidate transmission link sequence, the switch S shown in fig. 2 can be determined 1 To S 4 The operating state under the data interaction process performed in time sequence, namely the target network state (b).
S104, the low-delay transmission device controls the image data transmission network to be changed from the current network state to the target network state, so that the image data to be transmitted are transmitted in the image data transmission network based on the data stream corresponding to the target state.
In the low-latency image transmission system based on the software defined network disclosed in the first aspect of the present invention, the low-latency transmission control device determines a candidate link sequence that minimizes the packet loss amount in the transmission process of the image data, so as to determine the target network state, and controls the image data transmission network to be converted from the current network state to the target network state, so as to realize the transmission of the image data, and by minimizing the packet loss amount in the transmission process, the latency caused by the retransmission of the data in the image transmission process is reduced, thereby reducing the total latency in the image transmission process, and being beneficial to meeting the low-latency requirement of the image transmission.
Alternatively, for the network structure provided with the router, step S103 may specifically include the following operations:
s1031, the low-delay transmission device determines a target routing table in the next stage according to the candidate transmission link sequence.
S1032, the low-delay transmission device determines the state of the target network according to the target routing table of the next stage.
Further alternatively, for a network structure provided with a router, the high efficiency of updating the state of the router is beneficial to reduce the time delay of the image transmission process. Then, for the case where there are several candidate transmission link sequences determined in step S102, it is necessary to ensure that the routing table is unique. Therefore, after step S1031 and before step S1032, it is necessary to determine the target routing table of the next stage and perform the corresponding operation according to the determination result, specifically:
the low-delay transmission device judges whether a target routing table of the next stage is unique;
if yes, go to step S1032;
if not, the low-delay transmission device screens out a target routing table of the next stage with the minimum network state transformation complexity;
and the low-delay transmission device determines the state of the target network according to the target routing table of the next stage indicated by the screening result.
The number of devices in the conversion state may be considered to be larger, and specifically, the conversion state may be a conversion working state (e.g., standby state, on state, off state), a conversion connection state (e.g., on state, off state, to-be-networked state), or a conversion data transmission direction (e.g., receiving data state, sending data state).
Still further alternatively, for a network with i devices, the network state transition complexity P may also be found based on the following formula:
wherein mu is i Representing the state transition complexity coefficient of the ith device, q i Representing the state transition complexity of the i-th device.
The second aspect of the invention discloses a low-delay image transmission method based on a software defined network, which is applied to the low-delay image transmission system based on the software defined network described in the first aspect of the invention.
Therefore, in the low-latency image transmission method based on the software defined network disclosed in the second aspect of the present invention, the low-latency transmission control device determines the candidate link sequence that minimizes the packet loss in the image data transmission process, so as to determine the target network state, and controls the image data transmission network to be converted from the current network state to the target network state, so as to realize the image data transmission.
The apparatus embodiments described above are merely illustrative, in which the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical, i.e., may be located in one place, or may be distributed over multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above detailed description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product that may be stored in a computer-readable storage medium including Read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable programmable Read-Only Memory (EEPROM), compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disc Memory, magnetic disc Memory, tape Memory, or any other medium that can be used for computer-readable carrying or storing data.
Finally, it should be noted that: the embodiment of the invention discloses a low-delay image transmission system and a low-delay image transmission method based on a software defined network, which are disclosed by the embodiment of the invention only for illustrating the technical scheme of the invention, but not limiting the technical scheme; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (4)
1. The low-delay image transmission system based on the software defined network is characterized in that the low-delay image transmission system is provided with a low-delay transmission control device, the low-delay transmission control device is used for controlling the image data transmission network of the low-delay image transmission system to operate, and the low-delay transmission control device executes the following steps:
the low-delay transmission control device determines the current network state according to the current routing table of the image data transmission network at the current stage;
the low-delay transmission control device determines a transmission link sequence which minimizes the packet loss in the transmission process of the image data as a candidate transmission link sequence;
the low-delay transmission control device determines a target network state according to the candidate transmission link sequence;
the low-delay transmission control device controls the image data transmission network to be changed from the current network state to the target network state, so that the image data to be transmitted is transmitted in the image data transmission network based on the data stream corresponding to the target network state;
the low-delay transmission control device determines a transmission link sequence which minimizes the packet loss in the transmission process of the image data as a candidate transmission link sequence, and specifically comprises:
the low-delay transmission control device determines a transmission link sequence which minimizes the packet loss amount in the transmission process of the image data as a candidate transmission link sequence according to attribute information of the image data to be transmitted and a predetermined transmission link utilization rate;
in the step of determining, by the low-latency transmission control apparatus, that a transmission link sequence that minimizes the packet loss amount in the transmission process of image data is a candidate transmission link sequence according to attribute information of the image data to be transmitted and a predetermined transmission link utilization, the low-latency transmission control apparatus determines, by a network congestion minimizing algorithm, that a transmission link sequence that minimizes the packet loss amount in the transmission process of image data is a candidate transmission link sequence, wherein the network congestion minimizing algorithm determines that the process of the candidate transmission link sequence is as follows:
knowing that the utilization of the individual transmission links applicable to the image data to be transmitted in the image data transmission network is equal, finding each data stream on all loop-free paths in the end-to-end transmission direction of the image data to be transmittedPacket loss quantization index value->：
；
In the method, in the process of the invention,representing data stream->From the present stage network state->Migration to predicted next phase network State +.>Flow value limited in the course of (2),>representing the restricted flow value +.>From the present stage network state->Migration to predicted next phase network State +.>Influence coefficient in the process of (2),>representing->From the present stage network state->Migration to predicted next phase networkStatus->The amount of direct deviation in the process of (2);
and generating a candidate transmission link sequence based on the data stream set which is obtained by screening and enables the total number of the packet loss quantization index values to be minimum.
2. The low-latency image transmission system based on software defined network according to claim 1 wherein the low-latency transmission control means determines a target network state from the candidate transmission link sequence, specifically comprising:
the low-delay transmission control device determines a target routing table at the next stage according to the candidate transmission link sequence;
and the low-delay transmission control device determines the state of the target network according to the target routing table of the next stage.
3. The software defined network based low latency image transmission system according to claim 2 wherein after the low latency transmission control apparatus determines a target routing table at a next stage based on the candidate transmission link sequence and before the low latency transmission control apparatus determines a target network state based on the target routing table at the next stage, the method further comprises
The low-delay transmission control means determines whether the target routing table of the next stage is unique,
if yes, executing the operation of determining the state of the target network according to the target routing table of the next stage;
if not, the low-delay transmission control device screens out a target routing table of the next stage with the minimum network state transformation complexity;
and the low-delay transmission control device determines the state of the target network according to the target routing table of the next stage indicated by the screening result.
4. A low-latency image transmission method based on a software defined network, wherein the low-latency image transmission method is applied to the low-latency image transmission system based on a software defined network according to any one of claims 1 to 3; and it comprises the steps of:
s101, a low-delay transmission device determines the current network state according to the current routing table of the image data transmission network at the current stage;
s102, the low-delay transmission device determines a transmission link sequence which minimizes the packet loss in the transmission process of the image data as a candidate transmission link sequence.
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