CN113014505B - Transmission control method for time delay differentiation in high dynamic topology satellite network - Google Patents
Transmission control method for time delay differentiation in high dynamic topology satellite network Download PDFInfo
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- CN113014505B CN113014505B CN202110338705.4A CN202110338705A CN113014505B CN 113014505 B CN113014505 B CN 113014505B CN 202110338705 A CN202110338705 A CN 202110338705A CN 113014505 B CN113014505 B CN 113014505B
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- 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
- H04L47/27—Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0823—Errors, e.g. transmission errors
- H04L43/0829—Packet loss
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
Abstract
The transmission control method for time delay differentiation in the high dynamic topology satellite network, provided by the embodiment of the application, is applied to the technical field of communication, and can acquire the current time delay information of the satellite network; acquiring time delay change according to the current time delay information and pre-acquired historical time delay information, and judging whether the time delay change is caused by satellite switching; if so, performing time delay detection on the satellite network to obtain a minimum time delay value in the time delay detection process; calculating and updating a congestion window by utilizing a preset time delay detection algorithm according to the minimum time delay value; and sending the information according to the congestion window obtained by calculation. By the method, whether the current time delay is the time delay caused by satellite switching can be judged, if yes, the minimum time delay value in the time delay detection process can be obtained, and the congestion window is calculated and updated by the aid of the preset time delay detection algorithm, so that the problem of network bandwidth resource waste can be solved, and the transmission efficiency of the satellite network is improved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a transmission control method for time delay differentiation in a high dynamic topology satellite network.
Background
Currently, satellite communication systems have attracted more and more attention due to advantages of easy and rapid deployment, large capacity, low latency, global coverage, and the like.
However, current satellite network transmission control protocols are largely followed by designs similar to terrestrial transmission control protocols, e.g., delay-based transmission control protocols such as Vegas, which use an increase in delay as an indicator of congestion, decrease the congestion window when the delay is increased, and increase the congestion window when the delay is decreased. However, in the satellite network, since the increase of the delay may be caused by the path change, when the change of the path causes the increase of the delay, the congestion window is reduced, the network bandwidth resource is wasted, and the transmission efficiency of the satellite network is affected.
Disclosure of Invention
The embodiment of the application aims to provide a transmission control method for time delay differentiation in a high dynamic topology satellite network, so as to solve the problem of network bandwidth resource waste. The specific technical scheme is as follows:
in a first aspect of the present application, a transmission control method for time delay differentiation in a high dynamic topology satellite network is first provided, where the method includes:
acquiring current time delay information of a satellite network;
acquiring time delay change according to the current time delay information and pre-acquired historical time delay information, and judging whether the time delay change is caused by satellite switching;
if so, performing time delay detection on the satellite network to obtain a minimum time delay value in the time delay detection process;
calculating and updating a congestion window by utilizing a preset time delay detection algorithm according to the minimum time delay value;
and sending information according to the congestion window obtained by calculation.
Optionally, the obtaining a delay variation according to the current delay information and the pre-obtained historical delay information, and determining whether the delay variation is caused by satellite handover includes:
acquiring a time delay change rate according to the current time delay information and pre-acquired historical time delay information;
and when the time delay change rate is larger than a preset change rate threshold value, judging that the current time delay is the time delay caused by satellite switching.
Optionally, the method further includes:
setting a timer according to the current time delay information;
checking whether the timer has timed out;
and if the time is out, adding the unacknowledged data packet to the tail part of the sending queue, and retransmitting and sending the sending queue after new time delay information is acquired.
Optionally, the obtaining of the delay variation according to the current delay information and the pre-obtained historical delay information, and determining whether the delay variation is caused by satellite handover, the method further includes:
if not, calculating and updating the congestion window by using a preset time delay detection algorithm according to the current time delay information.
Optionally, the method further includes:
acquiring the packet loss rate of the satellite network;
when the packet loss rate is greater than a preset threshold value, reducing a current congestion window;
and when the packet loss rate is smaller than a preset threshold value, increasing the current congestion window.
In a second aspect of the present application, a transmission control device for time delay differentiation in a high dynamic topology satellite network is provided, where the device includes:
the information acquisition module is used for acquiring the current time delay information of the satellite network;
the information judgment module is used for acquiring time delay change according to the current time delay information and pre-acquired historical time delay information and judging whether the time delay change is caused by satellite switching;
the minimum time delay acquisition module is used for carrying out time delay detection on the satellite network if the minimum time delay acquisition module is used for obtaining a minimum time delay value in the time delay detection process;
the congestion window calculation module is used for calculating and updating a congestion window by utilizing a preset time delay detection algorithm according to the minimum time delay value;
and the information sending module is used for sending information according to the congestion window obtained by calculation.
Optionally, the information determining module includes:
the time delay change rate obtaining submodule is used for obtaining the time delay change rate according to the current time delay information and the pre-obtained historical time delay information;
and the time delay judging module is used for judging that the current time delay is the time delay caused by satellite switching when the time delay change rate is greater than a preset change rate threshold value.
Optionally, the apparatus further comprises:
the timer setting module is used for setting a timer according to the current time delay information;
the timer checking module is used for checking whether the timer is overtime or not;
and the resending module is used for adding the unacknowledged data packets to the tail part of the sending queue if the time is overtime, and resending and sending the sending queue after new time delay information is acquired.
Optionally, the apparatus further comprises:
and the congestion window updating module is used for calculating and updating the congestion window by using a preset time delay detection algorithm according to the current time delay information if the current time delay information is not the current time delay information.
Optionally, the apparatus further comprises:
the packet loss rate acquisition module is used for acquiring the packet loss rate of the satellite network;
a congestion window reducing module, configured to reduce a current congestion window when the packet loss rate is greater than a preset threshold;
and the congestion window increasing module is used for increasing the current congestion window when the packet loss rate is smaller than a preset threshold value.
The implementation of the application also provides electronic equipment which comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete mutual communication through the communication bus;
a memory for storing a computer program;
and the processor is used for realizing the transmission control method for time delay differentiation in any high dynamic topology satellite network when executing the program stored in the memory.
The application also provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the transmission control method for time delay differentiation in any high dynamic topology satellite network is implemented.
The present application also provides a computer program product containing instructions, which when run on a computer, causes the computer to execute any of the above-described methods for delay-differentiated transmission control in a high dynamic topology satellite network.
The embodiment of the application has the following beneficial effects:
the transmission control method for time delay differentiation in the high dynamic topology satellite network provided by the embodiment of the application can acquire the current time delay information of the satellite network; acquiring time delay change according to the current time delay information and pre-acquired historical time delay information, and judging whether the time delay change is caused by satellite switching; if so, performing time delay detection on the satellite network to obtain a minimum time delay value in the time delay detection process; calculating and updating a congestion window by utilizing a preset time delay detection algorithm according to the minimum time delay value; and sending information according to the congestion window obtained by calculation. By the method, whether the current time delay is the time delay caused by satellite switching can be judged, if yes, the minimum time delay value in the time delay detection process can be obtained, and the congestion window is calculated and updated by the aid of the preset time delay detection algorithm, so that the problem of network bandwidth resource waste can be solved, and the transmission efficiency of the satellite network is improved.
Of course, not all advantages described above need to be achieved at the same time in the practice of any one product or method of the present application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a transmission control method for time delay differentiation in a high dynamic topology satellite network according to an embodiment of the present application;
fig. 2 is a flowchart illustrating a fast retransmission mechanism according to an embodiment of the present application;
fig. 3 is a schematic flowchart of dynamic congestion window upper bound according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a transmission control apparatus for time delay differentiation in a high dynamic topology satellite network according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the description herein are intended to be within the scope of the present disclosure.
In a first aspect of the embodiments of the present application, a transmission control method for time delay differentiation in a high dynamic topology satellite network is first provided, where the method includes:
acquiring current time delay information of a satellite network;
acquiring time delay change according to the current time delay information and pre-acquired historical time delay information, and judging whether the time delay change is caused by satellite switching;
if so, performing time delay detection on the satellite network to obtain a minimum time delay value in the time delay detection process;
calculating and updating a congestion window by using a preset time delay detection algorithm according to the minimum time delay value;
and sending the information according to the congestion window obtained by calculation.
Therefore, by the method of the embodiment of the application, whether the current time delay is the time delay caused by satellite switching can be judged, if yes, the minimum time delay value in the time delay detection process can be obtained, and the congestion window is calculated and updated by using the preset time delay detection algorithm, so that the problem of network bandwidth resource waste can be avoided, and the transmission efficiency of a satellite network is improved.
Specifically, referring to fig. 1, fig. 1 is a schematic flow chart of a transmission control method for time delay differentiation in a high dynamic topology satellite network according to an embodiment of the present application, including:
and step S11, acquiring the current time delay information of the satellite network.
The satellite network in the embodiment of the present application may be a low earth orbit satellite constellation network. The transmission control method for time delay differentiation in the high dynamic topology satellite network is applied to an intelligent terminal, and specifically, the intelligent terminal can be a computer or a server for training a model.
And step S12, acquiring time delay change according to the current time delay information and the pre-acquired historical time delay information, and judging whether the time delay change is caused by satellite switching.
Optionally, obtaining a delay variation according to the current delay information and the pre-obtained historical delay information, and determining whether the delay variation is caused by satellite handover, includes: acquiring a time delay change rate according to the current time delay information and pre-acquired historical time delay information; and when the time delay change rate is greater than a preset change rate threshold value, judging that the current time delay is the time delay caused by satellite switching.
In practical use, the delay variation may be caused by the satellite motion, and may also be caused by the link variation due to the satellite switching. In which the relative motion between the satellite and the ground causes a slow, nearly linear increase in link delay, and the satellite handoff may cause a delay jump of tens to hundreds of milliseconds. This phenomenon can therefore be used to distinguish between changing states of the satellite network.
For example, before the congestion control state machine enters the delay detection stage, whether the current delay is in slow linear increase or not is judged through the stored RTT (Round-Trip Time) information and the current RTT, and if so, it indicates that the delay variation is caused by the satellite motion, and this Time delay detection is skipped; otherwise, entering a time delay detection phase. For example, using the formula:
calculating the time delay change rate in the last n RTT periods, wherein the RTT i For the delay of the current probing phase, RTT i-1 The time delay of the previous probing phase. If the RTT is in an increasing state for n continuous periods and the change rate does not exceed a preset threshold value delta, the delay change is considered to be caused by the satellite motion, otherwise, the delay change is caused by the increase of a buffer queue in the network.
And S13, if so, performing time delay detection on the satellite network to obtain a minimum time delay value in the time delay detection process.
If the time delay change rate is greater than the preset change rate threshold value, the current time delay is determined to be the time delay caused by satellite switching, time delay detection is carried out on the satellite network, and a complete bandwidth time delay detection process can be carried out.
Optionally, after acquiring the delay variation according to the current delay information and the pre-acquired historical delay information and determining whether the delay variation is caused by satellite handover, the method further includes: and if not, calculating and updating the congestion window by using a preset time delay detection algorithm according to the current time delay information.
And S14, calculating and updating the congestion window by using a preset time delay detection algorithm according to the minimum time delay value.
Because, if the link delay is suddenly increased from a small value, the estimation of the link bandwidth delay product is small according to the calculation of the previously detected minimum RTT, and the bandwidth resource cannot be fully utilized. If the RTT =10ms before, and the RTT =100ms after the path change, and a congestion window is calculated by using a BBR (congestion control algorithm) according to the RTT =10ms, the bandwidth utilization rate is reduced to one tenth of the original bandwidth utilization rate. Therefore, after the source end monitors that the time delay has large mutation, the method immediately enters a time delay detection stage, updates the basic RTT to the minimum value in the time delay detection stage, and then calculates the congestion window according to the new basic RTT.
For example, the new delay detection algorithm may be as follows:
inputting: current and historical Round Trip Time (RTT) i
If the difference value of the current time delay compared with the last period is larger than a certain threshold value or the time delay change rate in the past period is larger than a certain threshold value, directly entering a time delay detection stage, and re-measuring the real time delay of the link; otherwise, skipping the time delay detection and continuing to use the previous measured value.
And step S15, sending information according to the congestion window obtained by calculation.
Therefore, by the method of the embodiment of the application, whether the current time delay is the time delay caused by satellite switching can be judged, if yes, the minimum time delay value in the time delay detection process can be obtained, and the congestion window is calculated and updated by using the preset time delay detection algorithm, so that the problem of network bandwidth resource waste can be avoided, and the transmission efficiency of a satellite network is improved.
Optionally, referring to fig. 2, fig. 2 is a schematic flow chart of a fast retransmission mechanism provided in an embodiment of the present application, where the method further includes:
and step S21, setting a timer according to the current time delay information.
And setting a timer according to the current time delay information, obtaining link time delay information by performing time delay detection on the satellite network, and setting the timer at the sending end according to the link time delay information.
In step S22, it is checked whether the timer has timed out.
Whether the timer is overtime or not is checked, whether the timer is overtime or not can be judged by comparing the preset time with the current time, the specific time can be set according to the actual condition, and the method and the device are not limited.
And step S23, if the time is out, adding the unacknowledged data packets to the tail of the sending queue, and retransmitting the sending queue after new time delay information is acquired.
In the actual use process, if the time is out, the system can enter a fast retransmission state, and in the fast retransmission state, a sending end adds an unconfirmed data packet to the tail part of a sending queue; and then, performing delay detection through the sending end, and after new link delay information is obtained, starting to retransmit the data packets in the sending queue.
Since the topology relationship changes along with the movement of the satellite, the route of the satellite network also needs to be updated, and in the period of updating the route rule, in order to avoid the generation of a route loop, the old route cannot be used, so that the satellite network discards all the received data packets and acknowledgement packets. If the discarded data packet and the confirmation packet are the middle part of the data stream, after the route updating is finished, a repeated confirmation packet can be generated after the subsequent data packet reaches a receiving end, and then the lost data packet in the route updating process is retransmitted by utilizing a quick retransmission mechanism; if the discarded data packet is the tail of the data stream, the sending end can only wait for the timeout retransmission timer to retransmit the lost data packet by using the timeout retransmission mechanism after the timeout retransmission timer expires. However, if the route update takes a long time, the previous several time-out retransmissions will fail due to the link being unavailable, resulting in the timer being back off to a larger value in an exponential manner, decreasing the transmission efficiency of the satellite network and increasing the flow completion time.
According to the method and the device, a timer can be added at the sending end, and the timer is reset once every time an acknowledgement packet is received. If the timer is over, it indicates that a route update may occur, resulting in a large number of packets being discarded, and therefore all the currently transmitted unacknowledged packets are inserted into the transmission queue. After the delay detection phase is completed, that is, the link is detected to be normal, the data packet transmission is started. Therefore, the problems of overtime retransmission and the like caused by route updating are solved through a mechanism of sending the redundant packet, and the flow completion time is shortened.
For example, the fast retransmission algorithm of the present application is as follows:
inputting: round trip time RTT i Retransmission Timer
The sending end firstly sets a timer according to the current time delay, and resets the timer after receiving the ACK packet. And after the timer is overtime, inserting the data packet which is sent by the sending end but is not confirmed into the tail part of the current sending queue for quick retransmission.
Therefore, the method of the embodiment of the application can perform time delay detection on the satellite network to obtain the information sent in the time delay detection process, resend the information sent in the time delay detection process, solve the problems of timeout retransmission and the like caused by route updating through a mechanism of sending redundant packets, and reduce the flow completion time.
Optionally, referring to fig. 3, fig. 3 is a schematic flowchart of a dynamic congestion window upper bound provided in the embodiment of the present application, where the method further includes:
step S31, obtaining the packet loss rate of the satellite network;
step S32, when the packet loss rate is greater than a preset threshold value, reducing the current congestion window;
and step S33, when the packet loss rate is smaller than a preset threshold value, increasing the current congestion window.
When the packet loss rate is less than the preset threshold, the current congestion window is increased, and the upper limit of the current congestion window is decreased.
If the cache of the switch in the network is large, when the congestion control algorithm based on packet loss driving competes currently, the fixed upper limit setting also limits the cache proportion that the data flow can occupy, resulting in a small bandwidth estimation and incapability of fairly occupying the bandwidth with other congestion control algorithms. Therefore, the present application uses a dynamic congestion window upper limit adjustment algorithm to adjust the upper limit of the number of sent unacknowledged packets in real time according to the network conditions. The specific algorithm is as follows:
inputting: loss rate Loss, throughput, round trip time RTT, bandwidth estimation value BtlBw and RTT estimation value RTprop
And (3) outputting: congestion window upper limit CWND
When the sending end monitors that the packet loss rate in the last RTT period is greater than a certain threshold value or the actual RTT measurement value is greater than the RTT estimation value, the result indicates that the upper bound of the current congestion window is large, so that the buffer queue in the network is too large and even overflows, and the upper bound of the congestion window can be reduced. And if the actual throughput in the last RTT period is less than the estimated bandwidth value, which indicates that the current upper limit of the congestion window is not enough to fully utilize the available bandwidth of the link, the upper limit of the congestion window may be increased. In other cases, the sender keeps the congestion window upper limit unchanged. In practical use, in order to maintain the stability of data transmission, the variation range of the upper bound of the congestion window may be limited to 1.2 times BDP (bandwidth) to 2 times BDP.
Therefore, by the method of the embodiment of the application, the packet loss rate of the satellite network can be obtained, and the current congestion window can be dynamically adjusted.
In a second aspect of the embodiment of the present application, a transmission control device for time delay differentiation in a high dynamic topology satellite network is provided, referring to fig. 4, where fig. 4 is a schematic structural diagram of the transmission control device for time delay differentiation in the high dynamic topology satellite network provided in the embodiment of the present application, where the device includes:
an information obtaining module 401, configured to obtain current time delay information of a satellite network;
an information determining module 402, configured to obtain a delay variation according to the current delay information and pre-obtained historical delay information, and determine whether the delay variation is caused by satellite handover;
a minimum delay obtaining module 403, configured to perform delay detection on the satellite network if the minimum delay value is positive, to obtain a minimum delay value in the delay detection process;
a congestion window calculation module 404, configured to calculate and update a congestion window by using a preset delay detection algorithm according to the minimum delay value;
and an information sending module 405, configured to send information according to the calculated congestion window.
Optionally, the information determining module includes:
the time delay change rate acquisition submodule is used for acquiring the time delay change rate according to the current time delay information and the pre-acquired historical time delay information;
and the time delay judging module is used for judging that the current time delay is the time delay caused by satellite switching when the time delay change rate is greater than a preset change rate threshold value.
Optionally, the apparatus further comprises:
the timer setting module is used for setting a timer according to the current time delay information;
the timer checking module is used for checking whether the timer is overtime;
and the resending module is used for adding the unacknowledged data packets to the tail part of the sending queue if the time is overtime, and retransmitting the sending queue after new time delay information is acquired.
Optionally, the apparatus further comprises:
and the congestion window updating module is used for calculating and updating the congestion window by using a preset time delay detection algorithm according to the current time delay information if the congestion window is not updated.
Optionally, the apparatus further comprises:
the packet loss rate acquisition module is used for acquiring the packet loss rate of the satellite network;
the congestion window reducing module is used for reducing the current congestion window when the packet loss rate is greater than a preset threshold;
and the congestion window increasing module is used for increasing the current congestion window when the packet loss rate is smaller than a preset threshold value.
Therefore, through the device provided by the embodiment of the application, whether the current time delay is the time delay caused by satellite switching can be judged, if yes, the minimum time delay value in the time delay detection process can be obtained, and the congestion window is calculated and updated by using the preset time delay detection algorithm, so that the problem of network bandwidth resource waste can be avoided, and the transmission efficiency of a satellite network is improved.
The embodiment of the present application further provides an electronic device, as shown in fig. 5, which includes a processor 501, a communication interface 502, a memory 503 and a communication bus 504, wherein the processor 501, the communication interface 502 and the memory 503 complete mutual communication through the communication bus 504,
a memory 503 for storing a computer program;
the processor 501, when executing the program stored in the memory 503, implements the following steps:
acquiring current time delay information of a satellite network;
acquiring time delay change according to the current time delay information and pre-acquired historical time delay information, and judging whether the time delay change is caused by satellite switching;
if so, performing time delay detection on the satellite network to obtain a minimum time delay value in the time delay detection process;
calculating and updating a congestion window by using a preset time delay detection algorithm according to the minimum time delay value;
and sending the information according to the congestion window obtained by calculation.
The communication bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components.
In another embodiment provided by the present application, a computer-readable storage medium is further provided, in which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the transmission control method for time delay differentiation in any of the high dynamic topology satellite networks described above.
In yet another embodiment provided by the present application, there is also provided a computer program product containing instructions which, when run on a computer, cause the computer to perform the method for delay-differentiated transmission control in any of the above-described embodiments of the high dynamic topology satellite network.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus, the electronic device, the storage medium, and the computer program product embodiment, since they are substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to part of the description of the method embodiment.
The above description is only for the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.
Claims (8)
1. A transmission control method for time delay differentiation in a high dynamic topology satellite network is characterized by comprising the following steps:
acquiring current time delay information of a satellite network;
acquiring time delay change according to the current time delay information and pre-acquired historical time delay information, and judging whether the time delay change is caused by satellite switching;
if so, performing time delay detection on the satellite network to obtain a minimum time delay value in the time delay detection process;
calculating and updating a congestion window by utilizing a preset time delay detection algorithm according to the minimum time delay value;
sending information according to the congestion window obtained by calculation;
after the information is sent according to the congestion window obtained by calculation, the method further includes:
setting a timer according to the current time delay information;
checking whether the timer has timed out;
and if the time is out, adding the unacknowledged data packet to the tail of the sending queue, and retransmitting and sending the sending queue after new time delay information is acquired.
2. The method of claim 1, wherein the obtaining a delay variation according to the current delay information and pre-obtained historical delay information, and determining whether the delay variation is caused by satellite handover comprises:
acquiring a time delay change rate according to the current time delay information and pre-acquired historical time delay information;
and when the time delay change rate is larger than a preset change rate threshold value, judging that the current time delay is the time delay caused by satellite switching.
3. The method according to claim 1, wherein the obtaining of the delay variation according to the current delay information and the pre-obtained historical delay information and determining whether the delay variation is caused by satellite handover further comprises:
if not, calculating and updating the congestion window by using a preset time delay detection algorithm according to the current time delay information.
4. The method of claim 1, further comprising:
acquiring the packet loss rate of the satellite network;
when the packet loss rate is greater than a preset threshold value, reducing a current congestion window;
and when the packet loss rate is smaller than a preset threshold value, increasing the current congestion window.
5. A delay-differentiated transmission control apparatus in a high dynamic topology satellite network, the apparatus comprising:
the information acquisition module is used for acquiring the current time delay information of the satellite network;
the information judgment module is used for acquiring time delay change according to the current time delay information and pre-acquired historical time delay information and judging whether the time delay change is caused by satellite switching;
the minimum time delay acquisition module is used for carrying out time delay detection on the satellite network if the minimum time delay acquisition module is used for obtaining a minimum time delay value in the time delay detection process;
the congestion window calculation module is used for calculating and updating a congestion window by utilizing a preset time delay detection algorithm according to the minimum time delay value;
the information sending module is used for sending information according to the congestion window obtained by calculation;
the device further comprises:
the timer setting module is used for setting a timer according to the current time delay information;
the timer checking module is used for checking whether the timer is overtime or not;
and the retransmission module is used for adding the unacknowledged data packet to the tail part of the transmission queue if the time is out, and retransmitting and transmitting the transmission queue after new time delay information is acquired.
6. The apparatus of claim 5, wherein the information determining module comprises:
the time delay change rate obtaining submodule is used for obtaining the time delay change rate according to the current time delay information and the pre-obtained historical time delay information;
and the time delay judging module is used for judging that the current time delay is the time delay caused by satellite switching when the time delay change rate is greater than a preset change rate threshold value.
7. The electronic equipment is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor and the communication interface are used for realizing the communication between the processor and the memory through the communication bus;
a memory for storing a computer program;
a processor for implementing the method steps of any of claims 1 to 4 when executing a program stored in the memory.
8. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of any one of claims 1 to 4.
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