CN112543296B - Delay control method, delay control device and network equipment - Google Patents
Delay control method, delay control device and network equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
- H04N21/64784—Data processing by the network
- H04N21/64792—Controlling the complexity of the content stream, e.g. by dropping packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
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Abstract
The embodiment of the invention relates to the field of communication, and discloses a delay control method, a delay control device and network equipment. The delay control method comprises the following steps: acquiring a packet loss quantity threshold according to the current receiving delay of the system and the maximum receiving delay of the system; if the number of the media packets to be retransmitted is larger than the threshold value of the number of the lost packets, increasing the receiving delay; and if the number of the media packets to be retransmitted is less than the packet loss number threshold, reducing the receiving delay. The method is applied to the packet loss retransmission process.
Description
Technical Field
The embodiment of the invention relates to the field of communication, in particular to a delay control method, a delay control device and network equipment.
Background
In the process of network transmission, the problem of packet loss often occurs. The prior art generally adopts a packet loss retransmission technology to solve the problem of packet loss. Specifically, when packet loss occurs, the receiving end sends a retransmission request to the sending end according to a preset sending frequency, wherein the retransmission request indicates a data packet to be retransmitted; and the sending end sends the data packet to the receiving end again according to the retransmission request.
However, in the practical application of the real-time communication system, the anti-packet-loss performance of packet loss retransmission is not ideal, and especially in services such as video calls, video conferences and the like which have extremely high requirements on real-time performance, the characteristic that packet loss retransmission requires at least one round trip time for transmission results in an obvious contradiction with the real-time performance.
Disclosure of Invention
The embodiment of the invention aims to provide a delay control method, a delay control device and network equipment, which can balance the packet loss resistance and the real-time performance.
In order to solve the above technical problem, an embodiment of the present invention provides a delay control method, which is applied to a packet loss retransmission process, and includes: acquiring a packet loss quantity threshold according to the current receiving delay of the system and the maximum receiving delay of the system; if the number of the media packets to be retransmitted is larger than the threshold value of the number of the lost packets, increasing the receiving delay; and if the number of the media packets to be retransmitted is less than the packet loss number threshold, reducing the receiving delay.
The embodiment of the present invention further provides a delay control device, which is applied to a packet loss retransmission process, and includes:
the first acquisition module is used for acquiring a packet loss quantity threshold according to the current receiving delay of the system and the maximum receiving delay of the system;
a first delay updating module, configured to increase the receiving delay if the number of the media packets to be retransmitted is greater than the threshold of the number of the packet losses obtained by the first obtaining module;
and the second delay updating module is configured to reduce the reception delay if the number of the media packets to be retransmitted is smaller than the packet loss number threshold acquired by the first acquiring module.
An embodiment of the present invention further provides a network device, including:
at least one processor; and (c) a second step of,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the latency control method described above.
Compared with the prior art, the embodiment of the invention has the advantages that the threshold value of the number of the lost packets is obtained according to the current receiving delay and the maximum receiving delay of the system, so that the threshold value of the number of the lost packets has a corresponding relation with the receiving delay, the effect of the receiving delay is considered when the size relation between the number of the media packets to be retransmitted and the threshold value of the number of the lost packets is judged, the anti-packet loss performance is considered when the receiving delay is updated, the real-time performance is also considered, and the effect of balancing the anti-packet loss performance and the real-time performance is achieved.
In addition, in the delay control method provided in the embodiment of the present invention, the step of obtaining the packet loss number threshold according to the current receiving delay of the system and the maximum receiving delay of the system is implemented by the following formula:
wherein T is the threshold of the packet loss quantity, D 0 For the said receiving delay, D max The maximum receive delay for the system. The technical scheme provided by the embodiment of the invention realizes the nonlinear self-adaptive delay control through the segmented packet loss number threshold.
In addition, in the delay control method provided in the embodiment of the present invention, the increasing the reception delay includes: acquiring a receiving delay growth rate according to the current time, the last time of updating the receiving delay and the maximum receiving delay of the system; and increasing the receiving delay according to the receiving delay increase rate.
In addition, in the delay control method provided in the embodiment of the present invention, the step of obtaining the increase rate of the reception delay according to the current time, the time of last update of the reception delay, and the maximum reception delay of the system is implemented by the following formula:
wherein R is the reception delay increase rate, t c For the current time, t is the last time of updating the reception delay, D max The unit is ms, which is the maximum receiving delay of the system. According to the technical scheme provided by the embodiment of the invention, the receiving delay growth rate is obtained through the formula, when the receiving delay is closer to the maximum receiving delay of the system, the growth speed is slower, and when the receiving delay is equal to the maximum receiving delay of the system, the calculation result of the growth speed is 0, so that the technical scheme can rapidly increase and ensure the anti-packet loss performance of the system by controlling the delay.
In addition, in the delay control method provided in the embodiment of the present invention, the step of increasing the reception delay according to the increase rate of the reception delay is implemented by the following formula:
wherein R is the reception delay increase rate, D t Is the reception delay at the last update, D 0 Delaying for the updated reception.
In addition, in the delay control method according to an embodiment of the present invention, reducing the reception delay includes: judging whether the network recovery time is greater than a preset recovery threshold value or not; if yes, acquiring a preset receiving delay attenuation rate; and reducing the receiving delay according to the receiving delay attenuation rate. The technical scheme provided by the embodiment of the invention can reduce the receiving delay through the preset receiving delay attenuation rate, thereby gradually restoring the real-time property of the system.
In addition, in the delay control apparatus according to an embodiment of the present invention, the first delay updating module includes: the first obtaining submodule is used for obtaining the receiving delay growth rate according to the current time, the time for updating the receiving delay last time and the maximum receiving delay of the system; and the first updating submodule is used for increasing the receiving delay according to the receiving delay increase rate acquired by the first acquiring submodule.
In addition, in the delay control apparatus according to an embodiment of the present invention, the second delay updating module includes: the judging submodule is used for judging whether the network recovery time is greater than a preset recovery threshold value or not; the second obtaining submodule is used for obtaining a preset receiving delay attenuation rate if the judgment result of the judging submodule is yes; and the second updating submodule is used for reducing the receiving delay according to the receiving delay attenuation rate acquired by the second acquisition submodule.
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One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a flowchart of a delay control method according to a first embodiment of the present invention;
fig. 2 is a flowchart of step 102 in the delay control method according to the first embodiment of the present invention shown in fig. 1;
fig. 3 is a flowchart of step 103 in the delay control method according to the first embodiment of the present invention shown in fig. 1;
fig. 4 is a schematic structural diagram of a delay control device according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a first delay updating module 402 in the delay control apparatus according to the second embodiment of the present invention shown in fig. 4;
fig. 6 is a schematic structural diagram of a second delay updating module 403 in the delay control device according to the second embodiment of the present invention shown in fig. 4;
fig. 7 is a schematic structural diagram of a network device according to a third embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present invention, and the embodiments may be mutually incorporated and referred to without contradiction.
A first embodiment of the present invention relates to a delay control method, which is applied to a packet loss retransmission process, and more specifically, to a receiving-end network device in the packet loss retransmission process, where a flow of the delay control method is shown in fig. 1, and includes:
In this embodiment, step 101 can be specifically implemented by the following formula (1):
wherein T is the threshold of the number of lost packets, D 0 For delay of reception, D max The maximum receiving delay of the system.
Of course, it should be noted that the above formula (1) is merely an example of the specific method implemented in step 101, and in the actual using process, the above formula may also be implemented by other similar formulas, and details of each case are not described here.
Through the technical scheme provided by the formula (1), the method and the device can realize nonlinear self-adaptive delay control through a segmented packet loss quantity threshold value.
As shown in fig. 2, in this embodiment, step 102 may specifically include:
Specifically, step 201 can be implemented by the following formula (2):
where R is the reception delay increase rate, t c Is the current time, t is the time of the last updated reception delay, D max The unit is ms for the maximum receiving delay of the system.
It should be noted that, as those skilled in the art should know, the 300ms related in the above formula (2) is only an example of a specific value obtained in an actual using process, and in the actual using process, the value may be changed according to a delay requirement of the system, which is not described herein.
According to the receiving delay increase rate obtained by the formula (2), when the receiving delay is closer to the maximum receiving delay of the system, the increase speed is slower, and when the receiving delay is equal to the maximum receiving delay of the system, the calculation result of the increase speed is 0, so that the technical scheme can ensure the anti-packet loss performance of the system by controlling the delay to be rapidly increased.
Specifically, step 202 can be implemented by the following formula (3):
where R is the reception delay increase rate, D t Is the reception delay at the last update, D 0 Is an updated receive delay.
And 103, if the number of the media packets to be retransmitted is less than the packet loss number threshold, reducing the receiving delay.
As shown in fig. 3, in this embodiment, step 103 may specifically include:
In this embodiment, if D 0 If "0" indicates that the current system has the best real-time performance, but the anti-packet loss performance of retransmission of packet loss is the lowest, and the network condition is good at this time, and there is almost no packet loss, step 301 can be directly performed, and if "D" indicates that the current system has the best real-time performance, step D can be performed directly 0 If not, it indicates that the network is currently in the delay control state and packet loss exists, and step 101 may be executed again.
It should be noted that, the present embodiment does not limit the preset recovery threshold, and the recovery threshold may be set according to the system requirement in the actual use process, and in order to enable those skilled in the art to more clearly understand the technical solution provided by the present embodiment, the recovery threshold may be set to 3s as an example.
It should be noted that, the present embodiment does not limit the preset receiving delay attenuation rate, and the receiving delay attenuation rate may be set according to the system requirement in the actual use process, and in order to make the technical solution provided by the present embodiment more clearly understood, the receiving delay attenuation rate = -300ms/s may be taken as an example for description.
And step 303, reducing the receiving delay according to the receiving delay attenuation rate.
Specifically, in this embodiment, step 303 can be implemented by the above-described formula (3).
Compared with the prior art, the embodiment of the invention has the advantages that the threshold value of the number of the lost packets is obtained according to the current receiving delay and the maximum receiving delay of the system, so that the threshold value of the number of the lost packets has a corresponding relation with the receiving delay, the effect of the receiving delay is considered when the size relation between the number of the media packets to be retransmitted and the threshold value of the number of the lost packets is judged, the anti-packet loss performance is considered when the receiving delay is updated, the real-time performance is also considered, and the effect of balancing the anti-packet loss performance and the real-time performance is achieved.
A second embodiment of the present invention relates to a delay control device, which is applied to a packet loss retransmission process, and more specifically, to a receiving-end network device in the packet loss retransmission process, where a flow of the delay control device is shown in fig. 4, and includes:
a first obtaining module 401, configured to obtain a packet loss number threshold according to a current receiving delay of a system and a maximum receiving delay of the system;
a first delay updating module 402, configured to increase the receiving delay if the number of media packets to be retransmitted is greater than the threshold of the number of packet losses acquired by the first acquiring module 401;
a second delay updating module 403, configured to reduce the receiving delay if the number of the media packets to be retransmitted is smaller than the threshold of the number of packet losses obtained by the first obtaining module 401.
Further, as shown in fig. 5, the first delay updating module 402 includes:
a first obtaining sub-module 501, configured to obtain a receiving delay increase rate according to a current time, a time of last updating the receiving delay, and a maximum receiving delay of the system;
a first updating submodule 502, configured to increase the receiving delay according to the receiving delay increase rate obtained by the first obtaining submodule 501.
Further, as shown in fig. 6, the second delay updating module 403 includes:
the judging submodule 601 is configured to judge whether the network restoration time is greater than a preset restoration threshold;
a second obtaining sub-module 602, configured to obtain a preset receiving delay attenuation rate if the result determined by the determining sub-module 601 is yes;
a second updating submodule 603, configured to reduce the receiving delay according to the receiving delay attenuation rate obtained by the second obtaining submodule 602.
Compared with the prior art, the embodiment of the invention has the advantages that the threshold value of the number of the lost packets is obtained according to the current receiving delay and the maximum receiving delay of the system, so that the threshold value of the number of the lost packets has a corresponding relation with the receiving delay, the effect of the receiving delay is considered when the size relation between the number of the media packets to be retransmitted and the threshold value of the number of the lost packets is judged, the anti-packet loss performance is considered when the receiving delay is updated, the real-time performance is also considered, and the effect of balancing the anti-packet loss performance and the real-time performance is achieved.
A third embodiment of the present invention relates to an electronic apparatus, as shown in fig. 7, including:
at least one processor 701; and the number of the first and second groups,
a memory 702 communicatively coupled to the at least one processor 701; wherein,
the memory 702 stores instructions executable by the at least one processor 701, and the instructions are executed by the at least one processor 701 to enable the at least one processor 701 to perform the latency control method according to the first embodiment of the present invention.
Where the memory and processor are connected by a bus, the bus may comprise any number of interconnected buses and bridges, the buses connecting together one or more of the various circuits of the processor and the memory. The bus may also connect various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface provides an interface between the bus and the transceiver. The transceiver may be one element or a plurality of elements, such as a plurality of receivers and transmitters, providing a means for communicating with various other apparatus over a transmission medium. The data processed by the processor is transmitted over a wireless medium via an antenna, which further receives the data and transmits the data to the processor.
The processor is responsible for managing the bus and general processing and may also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. While the memory may be used to store data used by the processor in performing operations.
A twelfth embodiment of the present invention relates to a computer-readable storage medium storing a computer program. The computer program realizes the above-described method embodiments when executed by a processor.
That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (9)
1. A delay control method is applied to a packet loss retransmission process, and is characterized by comprising the following steps:
acquiring a packet loss quantity threshold according to the current receiving delay of the system and the maximum receiving delay of the system;
if the number of the media packets to be retransmitted is larger than the threshold value of the number of the lost packets, increasing the receiving delay;
if the number of the media packets to be retransmitted is smaller than the packet loss number threshold, reducing the receiving delay;
the step of obtaining the packet loss number threshold according to the current receiving delay and the maximum receiving delay of the system is implemented by the following formula:
wherein T is the threshold of the packet loss quantity, D 0 The unit is ms for the receiving delay; d max The unit is ms, which is the maximum receiving delay of the system.
2. The method of claim 1, wherein the increasing the receive delay comprises:
acquiring a receiving delay increasing step length according to the current time, the time for updating the receiving delay last time and the maximum receiving delay of the system;
and increasing the receiving delay according to the receiving delay increasing step.
3. The method of claim 2, wherein the step of obtaining the step of increasing the receiving delay according to the current time, the time of last updating the receiving delay, and the maximum receiving delay of the system is implemented by the following formula:
wherein R is the receiving delay increasing step length, t c For the current time, t is the last time of updating the reception delay, D max The unit is ms, which is the maximum receiving delay of the system.
4. The method of claim 2, wherein the step of increasing the receiving delay according to the receiving delay increasing step is implemented by the following formula:
wherein R is the receiving delay increasing step length, D 0 t Is the reception delay at the last update, D 0 Delaying the updated reception.
5. The method of claim 1, wherein the reducing the receive delay comprises:
judging whether the network recovery time is greater than a preset recovery threshold value or not;
if yes, acquiring a preset receiving delay attenuation rate;
and reducing the receiving delay according to the receiving delay attenuation rate.
6. A delay control device applied in a packet loss retransmission process is characterized by comprising:
the first acquisition module is used for acquiring a packet loss quantity threshold according to the current receiving delay of the system and the maximum receiving delay of the system; the step of obtaining the packet loss number threshold according to the current receiving delay and the maximum receiving delay of the system is realized by the following formula:
wherein T is the threshold of the packet loss quantity, D 0 The unit is ms for the receiving delay; d max The unit is ms which is the maximum receiving delay of the system;
a first delay updating module, configured to increase the receiving delay if the number of media packets to be retransmitted is greater than the packet loss number threshold obtained by the first obtaining module;
and the second delay updating module is configured to reduce the reception delay if the number of the media packets to be retransmitted is smaller than the packet loss number threshold acquired by the first acquiring module.
7. The apparatus of claim 6, wherein the first delayed update module comprises:
the first obtaining submodule is used for obtaining the receiving delay increasing step length according to the current time, the time for updating the receiving delay last time and the maximum receiving delay of the system;
and the first updating submodule is used for increasing the receiving delay according to the receiving delay increasing step length acquired by the first acquiring submodule.
8. The apparatus of claim 6, wherein the second delayed update module comprises:
the judging submodule is used for judging whether the network recovery time is greater than a preset recovery threshold value;
the second obtaining submodule is used for obtaining a preset receiving delay attenuation rate if the judgment result of the judging submodule is positive;
and the second updating submodule is used for reducing the receiving delay according to the receiving delay attenuation rate acquired by the second acquisition submodule.
9. A network device, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a latency control method as claimed in any one of claims 1 to 5.
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