CN110545214A - time delay detection method based on video network and switch - Google Patents
time delay detection method based on video network and switch Download PDFInfo
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- CN110545214A CN110545214A CN201910775326.4A CN201910775326A CN110545214A CN 110545214 A CN110545214 A CN 110545214A CN 201910775326 A CN201910775326 A CN 201910775326A CN 110545214 A CN110545214 A CN 110545214A
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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
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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
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
- H04L43/106—Active monitoring, e.g. heartbeat, ping or trace-route using time related information in packets, e.g. by adding timestamps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/06—Notations for structuring of protocol data, e.g. abstract syntax notation one [ASN.1]
Abstract
the embodiment of the application provides a time delay detection method based on a video network and a video network terminal. The method comprises the following steps: the first switch constructs a first message according to the main type of the head of the video networking message, the first subtype of the video networking message and a first timestamp Ti1, and sends the first message to a second switch; receiving a second message sent by the second switch; when the main type of the head of the video networking message and the second subtype of the video networking message of the second message are matched with the rule of the video networking message set by the first switch, marking a fourth timestamp Ti4 on the second message; determining a video networking tunnel link latency between the first switch and the second switch according to the first timestamp Ti1, the second timestamp Ti2, the third timestamp Ti3 and the fourth timestamp Ti 4. Therefore, by combining the characteristics of the video network message, the time delay parameter of the video network tunnel can be calculated more accurately than the prior art.
Description
Technical Field
The present application relates to the field of video networking technologies, and in particular, to a time delay detection method and a switch based on video networking.
Background
With the rapid development of the video networking, video conferences, video teaching and the like based on the video networking are widely popularized in the aspects of life, work, learning and the like of users.
The performance of the video network is measured by some parameters required for receiving and forwarding the bearer data of the video network, wherein the data forwarding delay is an important performance parameter, which measures the network delay caused by the transmission of the user data by the tunnel of the video network.
in the prior art, the method for detecting the time delay only detects through a PING command, and the result is not accurate.
disclosure of Invention
In view of the above, embodiments of the present application are proposed to provide a method and a switch for latency detection based on video networking that overcome or at least partially solve the above problems.
In a first aspect, an embodiment of the present application discloses a time delay detection method based on a video network, where the method includes:
The first switch constructs a first message according to the main type of the head of the video networking message, the first subtype of the video networking message and a first timestamp Ti1, and sends the first message to a second switch; the first timestamp Ti1 is a time value when the first switch sends the first packet;
Receiving a second message sent by the second switch, wherein the second message is formed by stamping a second timestamp Ti2 on the first message, removing the encapsulation of the head of the video networking message of the first message and encapsulating the head of the video networking message according to a third timestamp Ti3 and a second subtype of the video networking message when the main type of the head of the video networking message of the first message is matched with the first subtype of the video networking message set by the second switch in a video networking message rule; the second timestamp Ti2 is a time value when the first packet arrives at the second switch, and the third timestamp Ti3 is a time value when the second packet is sent by the second switch;
When the main type of the head of the video networking message and the second subtype of the video networking message of the second message are matched with the rule of the video networking message set by the first switch, marking a fourth timestamp Ti4 on the second message; the fourth timestamp Ti4 is a time value at which the first switch receives the second packet;
Determining a video networking tunnel link latency between the first switch and the second switch according to the first timestamp Ti1, the second timestamp Ti2, the third timestamp Ti3 and the fourth timestamp Ti 4.
optionally, the link delay of the video networking tunnel includes link bidirectional delay, link unidirectional delay, and store-and-forward delay;
The link bidirectional time delay is calculated according to the difference value of the fourth time stamp Ti4 and the first time stamp Ti 1;
The link one-way delay is calculated from half the difference between the fourth timestamp Ti4 and the first timestamp Ti 1;
the store-and-forward delay is calculated from the difference between the third timestamp Ti3 and the second timestamp Ti 2.
Optionally, the sending the first packet to a second switch includes:
Sending the first message to the second switch according to a set time delay detection period; the time stamps of each set time delay detection period are respectively a first time stamp Ti1, a second time stamp Ti2, a third time stamp Ti3 and a fourth time stamp Ti4, i represents the loop-back frequency of time delay detection, and i is an integer greater than 1;
The determining of the video networking tunnel link latency between the first switch and the second switch according to the first timestamp Ti1, the second timestamp Ti2, the third timestamp Ti3 and the fourth timestamp Ti4 further comprises:
Calculating the maximum time delay, the minimum time delay and the average time delay in the bi-directional time delays of the links for i times;
And evaluating the performance of the tunnel link of the video network according to the maximum delay, the minimum delay and the average delay in the bi-directional delays of the i links.
Optionally, the first subtype of the video networking message is a video networking tunnel link delay request message type set by the first switch;
The second subtype of the video networking message is a video networking tunnel link time response message type set by the second switch.
in a second aspect, an embodiment of the present application discloses a switch, including:
the message construction and sending module is used for constructing a first message by the first switch according to the main type of the head of the video networking message, the first subtype of the video networking message and the first timestamp Ti1 and sending the first message to the second switch; the first timestamp Ti1 is a time value when the first switch sends the first packet;
The receiving module is used for receiving a second message sent by the second switch, and the second message is formed by stamping a second timestamp Ti2 on the first message, removing the encapsulation of the head of the video networking message of the first message and encapsulating the head of the video networking message according to a third timestamp Ti3 and a second subtype of the video networking message when the main type of the head of the video networking message of the first message and the first subtype of the video networking message are matched with the rule of the video networking message set by the second switch; the second timestamp Ti2 is a time value when the first packet arrives at the second switch, and the third timestamp Ti3 is a time value when the second packet is sent by the second switch;
The timestamp module is used for marking a fourth timestamp Ti4 on the second message when the main type of the head of the video networking message of the second message and the second subtype of the video networking message are matched with the set video networking message rule of the first switch; the fourth timestamp Ti4 is a time value at which the first switch receives the second packet;
A latency determination module, configured to determine a video network tunnel link latency between the first switch and the second switch according to the first timestamp Ti1, the second timestamp Ti2, the third timestamp Ti3, and the fourth timestamp Ti 4.
Optionally, the link delay of the video networking tunnel includes link bidirectional delay, link unidirectional delay, and store-and-forward delay;
The link bidirectional time delay is calculated according to the difference value of the fourth time stamp Ti4 and the first time stamp Ti 1;
the link one-way delay is calculated from half the difference between the fourth timestamp Ti4 and the first timestamp Ti 1;
The store-and-forward delay is calculated from the difference between the third timestamp Ti3 and the second timestamp Ti 2.
Optionally, the message structure sending module is specifically configured to:
Sending the first message to the second switch according to a set time delay detection period; the time stamps of each set time delay detection period are respectively a first time stamp Ti1, a second time stamp Ti2, a third time stamp Ti3 and a fourth time stamp Ti4, i represents the loop-back frequency of time delay detection, and i is an integer greater than 1;
The delay determining module is further configured to:
calculating the maximum time delay, the minimum time delay and the average time delay in the bi-directional time delays of the links for i times;
and evaluating the performance of the tunnel link of the video network according to the maximum delay, the minimum delay and the average delay in the bi-directional delays of the i links.
Optionally, the first subtype of the video networking message is a video networking tunnel link delay request message type set by the first switch;
The second subtype of the video networking message is a video networking tunnel link time response message type set by the second switch.
In a third aspect, an embodiment of the present application further discloses a computer device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, the method of any one of the first aspect is implemented.
in a fourth aspect, an embodiment of the present application further discloses a computer-readable storage medium, where a computer program for executing any one of the methods in the first aspect is stored in the computer-readable storage medium.
according to the time delay detection method based on the video network, the first switch receives a time delay detection instruction sent by a user; constructing a first message according to the main type of the head of the video networking message, the first subtype of the video networking message and the first timestamp Ti1, and sending the first message to a second switch; the first timestamp Ti1 is a time value when the first switch sends the first packet; receiving a second message sent by the second switch, wherein the second message is formed by stamping a second timestamp Ti2 on the first message, removing the encapsulation of the head of the video networking message of the first message and encapsulating the head of the video networking message according to a third timestamp Ti3 and a second subtype of the video networking message when the main type of the head of the video networking message of the first message is matched with the first subtype of the video networking message set by the second switch in a video networking message rule; the second timestamp Ti2 is a time value when the first packet arrives at the second switch, and the third timestamp Ti3 is a time value when the second packet is sent by the second switch; when the main type of the head of the video networking message and the second subtype of the video networking message of the second message are matched with the rule of the video networking message set by the first switch, marking a fourth timestamp Ti4 on the second message; the fourth timestamp Ti4 is a time value at which the first switch receives the second packet; determining a video networking tunnel link latency between the first switch and the second switch according to the first timestamp Ti1, the second timestamp Ti2, the third timestamp Ti3 and the fourth timestamp Ti 4. Therefore, by combining the characteristics of the video network message, the time delay parameter of the video network tunnel can be calculated more accurately than the prior art.
drawings
fig. 1 is a schematic networking diagram of a video network provided in an embodiment of the present application;
Fig. 2 is a schematic hardware structure diagram of a node server according to an embodiment of the present application;
Fig. 3 is a schematic hardware structure diagram of an access switch according to an embodiment of the present application;
Fig. 4 is a schematic hardware structure diagram of an ethernet protocol conversion gateway according to an embodiment of the present application;
FIG. 5 is a diagram illustrating a suitable system architecture according to an embodiment of the present application;
FIG. 6 is a flowchart illustrating steps of a latency detection method based on video networking according to an embodiment of the present application;
Fig. 7 is a schematic diagram of a format of a delay detection request packet according to an embodiment of the present application;
fig. 8 is a schematic diagram of a format of a delay detection response packet according to an embodiment of the present application;
FIG. 9 is a schematic diagram of another method embodiment provided by embodiments of the present application;
FIG. 10 is a schematic diagram of a method embodiment provided by an embodiment of the present application;
Fig. 11 is a block diagram of a switch provided in an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
The video networking is an important milestone for network development, is a real-time network, can realize high-definition video real-time transmission, and pushes a plurality of internet applications to high-definition video, and high-definition faces each other.
The video networking adopts a real-time high-definition video exchange technology, can integrate required services such as dozens of services of video, voice, pictures, characters, communication, data and the like on a system platform on a network platform, such as high-definition video conference, video monitoring, intelligent monitoring analysis, emergency command, digital broadcast television, delayed television, network teaching, live broadcast, VOD on demand, television mail, Personal Video Recorder (PVR), intranet (self-office) channels, intelligent video broadcast control, information distribution and the like, and realizes high-definition quality video broadcast through a television or a computer.
To better understand the embodiments of the present application, the following description refers to the internet of view:
Some of the technologies applied in the video networking are as follows:
Network Technology (Network Technology)
Network technology innovation in video networking has improved over traditional Ethernet (Ethernet) to face the potentially enormous video traffic on the network. Unlike pure network Packet Switching (Packet Switching) or network Circuit Switching (Circuit Switching), the internet of vision technology employs network Packet Switching to satisfy the demand of Streaming (translated into Streaming, and continuous broadcasting, which is a data transmission technology, converting received data into a stable and continuous stream, and continuously transmitting the stream, so that the sound heard by the user or the image seen by the user is very smooth, and the user can start browsing on the screen before the whole data is transmitted). The video networking technology has the advantages of flexibility, simplicity and low price of packet switching, and simultaneously has the quality and safety guarantee of circuit switching, thereby realizing the seamless connection of the whole network switching type virtual circuit and the data format.
Switching Technology (Switching Technology)
the video network adopts two advantages of asynchronism and packet switching of the Ethernet, eliminates the defects of the Ethernet on the premise of full compatibility, has end-to-end seamless connection of the whole network, is directly communicated with a user terminal, and directly bears an IP data packet. The user data does not require any format conversion across the entire network. The video networking is a higher-level form of the Ethernet, is a real-time exchange platform, can realize the real-time transmission of the whole-network large-scale high-definition video which cannot be realized by the existing Internet, and pushes a plurality of network video applications to high-definition and unification.
Server Technology (Server Technology)
The server technology on the video networking and unified video platform is different from the traditional server, the streaming media transmission of the video networking and unified video platform is established on the basis of connection orientation, the data processing capacity of the video networking and unified video platform is independent of flow and communication time, and a single network layer can contain signaling and data transmission. For voice and video services, the complexity of video networking and unified video platform streaming media processing is much simpler than that of data processing, and the efficiency is greatly improved by more than one hundred times compared with that of a traditional server.
storage Technology (Storage Technology)
the super-high speed storage technology of the unified video platform adopts the most advanced real-time operating system in order to adapt to the media content with super-large capacity and super-large flow, the program information in the server instruction is mapped to the specific hard disk space, the media content is not passed through the server any more, and is directly sent to the user terminal instantly, and the general waiting time of the user is less than 0.2 second. The optimized sector distribution greatly reduces the mechanical motion of the magnetic head track seeking of the hard disk, the resource consumption only accounts for 20% of that of the IP internet of the same grade, but concurrent flow which is 3 times larger than that of the traditional hard disk array is generated, and the comprehensive efficiency is improved by more than 10 times.
Network Security Technology (Network Security Technology)
the structural design of the video network completely eliminates the network security problem troubling the internet structurally by the modes of independent service permission control each time, complete isolation of equipment and user data and the like, generally does not need antivirus programs and firewalls, avoids the attack of hackers and viruses, and provides a structural carefree security network for users.
service Innovation Technology (Service Innovation Technology)
The unified video platform integrates services and transmission, and is not only automatically connected once whether a single user, a private network user or a network aggregate. The user terminal, the set-top box or the PC are directly connected to the unified video platform to obtain various multimedia video services in various forms. The unified video platform adopts a menu type configuration table mode to replace the traditional complex application programming, can realize complex application by using very few codes, and realizes infinite new service innovation.
Networking of the video network is as follows:
The video network is a centralized control network structure, and the network can be a tree network, a star network, a ring network and the like, but on the basis of the centralized control node, the whole network is controlled by the centralized control node in the network.
as shown in fig. 1, the video network is divided into an access network and a metropolitan network.
The devices of the access network part can be mainly classified into 3 types: node server, access switch, terminal (including various set-top boxes, coding boards, memories, etc.). The node server is connected to an access switch, which may be connected to a plurality of terminals and may be connected to an ethernet network.
The node server is a node which plays a centralized control function in the access network and can control the access switch and the terminal. The node server can be directly connected with the access switch or directly connected with the terminal.
similarly, devices of the metropolitan network portion may also be classified into 3 types: a metropolitan area server, a node switch and a node server. The metro server is connected to a node switch, which may be connected to a plurality of node servers.
The node server is a node server of the access network part, namely the node server belongs to both the access network part and the metropolitan area network part.
The metropolitan area server is a node which plays a centralized control function in the metropolitan area network and can control a node switch and a node server. The metropolitan area server can be directly connected with the node switch or directly connected with the node server.
Therefore, the whole video network is a network structure with layered centralized control, and the network controlled by the node server and the metropolitan area server can be in various structures such as tree, star and ring.
The access network part can form a unified video platform (circled part), and a plurality of unified video platforms can form a video network; each unified video platform may be interconnected via metropolitan area and wide area video networking.
video networking device classification
1.1 devices in the video network of the embodiment of the present application can be mainly classified into 3 types: servers, switches (including ethernet gateways), terminals (including various set-top boxes, code boards, memories, etc.). The video network as a whole can be divided into a metropolitan area network (or national network, global network, etc.) and an access network.
1.2 wherein the devices of the access network part can be mainly classified into 3 types: node servers, access switches (including ethernet gateways), terminals (including various set-top boxes, code boards, memories, etc.).
The specific hardware structure of each access network device is as follows:
A node server:
As shown in fig. 2, the system mainly includes a network interface module 201, a switching engine module 202, a CPU module 203, and a disk array module 204.
The network interface module 201, the CPU module 203, and the disk array module 204 all enter the switching engine module 202; the switching engine module 202 performs an operation of looking up the address table 205 on the incoming packet, thereby obtaining the direction information of the packet; and stores the packet in a queue of the corresponding packet buffer 206 based on the packet's steering information; if the queue of the packet buffer 206 is nearly full, it is discarded; the switching engine module 202 polls all packet buffer queues for forwarding if the following conditions are met: 1) the port send buffer is not full; 2) the queue packet counter is greater than zero. The disk array module 204 mainly implements control over the hard disk, including initialization, read-write, and other operations on the hard disk; the CPU module 203 is mainly responsible for protocol processing with an access switch and a terminal (not shown in the figure), configuring an address table 205 (including a downlink protocol packet address table, an uplink protocol packet address table, and a data packet address table), and configuring the disk array module 204.
the access switch:
As shown in fig. 3, the network interface module (downstream network interface module 301, upstream network interface module 302), the switching engine module 303, and the CPU module 304 are mainly included.
wherein, the packet (uplink data) coming from the downlink network interface module 301 enters the packet detection module 305; the packet detection module 305 detects whether the Destination Address (DA), the Source Address (SA), the packet type, and the packet length of the packet meet the requirements, if so, allocates a corresponding stream identifier (stream-id) and enters the switching engine module 303, otherwise, discards the stream identifier; the packet (downstream data) coming from the upstream network interface module 302 enters the switching engine module 303; the incoming data packet of the CPU module 304 enters the switching engine module 303; the switching engine module 303 performs an operation of looking up the address table 306 on the incoming packet, thereby obtaining the direction information of the packet; if the packet entering the switching engine module 303 is from the downstream network interface to the upstream network interface, the packet is stored in the queue of the corresponding packet buffer 307 in association with the stream-id; if the queue of the packet buffer 307 is nearly full, it is discarded; if the packet entering the switching engine module 303 is not from the downlink network interface to the uplink network interface, the data packet is stored in the queue of the corresponding packet buffer 307 according to the guiding information of the packet; if the queue of the packet buffer 307 is nearly full, it is discarded.
the switching engine module 303 polls all packet buffer queues, which in this embodiment is divided into two cases:
If the queue is from the downlink network interface to the uplink network interface, the following conditions are met for forwarding: 1) the port send buffer is not full; 2) the queued packet counter is greater than zero; 3) and obtaining the token generated by the code rate control module.
If the queue is not from the downlink network interface to the uplink network interface, the following conditions are met for forwarding: 1) the port send buffer is not full; 2) the queue packet counter is greater than zero.
The rate control module 208 is configured by the CPU module 204, and generates tokens for packet buffer queues from all downstream network interfaces to upstream network interfaces at programmable intervals to control the rate of upstream forwarding.
The CPU module 304 is mainly responsible for protocol processing with the node server, configuration of the address table 306, and configuration of the code rate control module 308.
Ethernet protocol gateway:
As shown in fig. 4, the system mainly includes a network interface module (a downlink network interface module 401 and an uplink network interface module 402), a switching engine module 403, a CPU module 404, a packet detection module 405, a rate control module 408, an address table 406, a packet buffer 407, a MAC adding module 409, a packet buffer, a,
A MAC deletion module 410.
wherein, the data packet coming from the downlink network interface module 401 enters the packet detection module 405; the packet detection module 405 detects whether the ethernet MAC DA, the ethernet MAC SA, the ethernet length or frame type, the video network destination address DA, the video network source address SA, the video network packet type, and the packet length of the packet meet the requirements, and if so, allocates a corresponding stream identifier (stream-id); then, the MAC deletion module 410 subtracts MAC DA, MAC SA, length or frame type (2byte) and enters the corresponding receiving buffer, otherwise, discards it;
the downlink network interface module 401 detects the sending buffer of the port, and if there is a packet, obtains the ethernet MAC DA of the corresponding terminal according to the video networking destination address DA of the packet, adds the ethernet MAC DA of the terminal, the MAC SA of the ethernet coordination gateway, and the ethernet length or frame type, and sends the packet.
the other modules in the ethernet protocol gateway function similarly to the access switch.
a terminal:
The system mainly comprises a network interface module, a service processing module and a CPU module; for example, the set-top box mainly comprises a network interface module, a video and audio coding and decoding engine module and a CPU module; the coding board mainly comprises a network interface module, a video and audio coding engine module and a CPU module; the memory mainly comprises a network interface module, a CPU module and a disk array module.
1.3 devices of the metropolitan area network part can be mainly classified into 3 types: node server, node exchanger, metropolitan area server. The node switch mainly comprises a network interface module, a switching engine module and a CPU module; the metropolitan area server mainly comprises a network interface module, a switching engine module and a CPU module.
2. video networking packet definition
2.1 Access network packet definition
The data packet of the access network mainly comprises the following parts: destination Address (DA), Source Address (SA), reserved bytes, payload (pdu), CRC.
As shown in the following table, the data packet of the access network mainly includes the following parts:
| DA | SA | Reserved | Payload | CRC |
the Destination Address (DA) is composed of 8 bytes (byte), the first byte represents the type of the data packet (e.g. various protocol packets, multicast data packets, unicast data packets, etc.), there are at most 256 possibilities, the second byte to the sixth byte are metropolitan area network addresses, and the seventh byte and the eighth byte are access network addresses.
The Source Address (SA) is also composed of 8 bytes (byte), defined as the same as the Destination Address (DA).
the reserved byte consists of 2 bytes.
The payload part has different lengths according to types of different datagrams, and is 64 bytes if the type of the datagram is a variety of protocol packets, or is 1056 bytes if the type of the datagram is a unicast packet, but is not limited to the above 2 types.
The CRC consists of 4 bytes and is calculated in accordance with the standard ethernet CRC algorithm.
2.2 metropolitan area network packet definition
The topology of a metropolitan area network is a graph and there may be 2, or even more than 2, connections between two devices, i.e., there may be more than 2 connections between a node switch and a node server, a node switch and a node switch, and a node switch and a node server. However, the metro network address of the metro network device is unique, and in order to accurately describe the connection relationship between the metro network devices, parameters are introduced in the embodiment of the present application: a label to uniquely describe a metropolitan area network device.
In this specification, the definition of the Label is similar to that of a Label of Multi-Protocol Label switching (MPLS), and assuming that there are two connections between a device a and a device B, there are 2 labels for a packet from the device a to the device B, and 2 labels for a packet from the device B to the device a. The label is classified into an incoming label and an outgoing label, and assuming that the label (incoming label) of the packet entering the device a is 0x0000, the label (outgoing label) of the packet leaving the device a may become 0x 0001. The network access process of the metro network is a network access process under centralized control, that is, address allocation and label allocation of the metro network are both dominated by the metro server, and the node switch and the node server are both passively executed, which is different from label allocation of MPLS, and label allocation of MPLS is a result of mutual negotiation between the switch and the server.
As shown in the following table, the data packet of the metro network mainly includes the following parts:
| DA | SA | Reserved | Label (R) | Payload | CRC |
Namely Destination Address (DA), Source Address (SA), Reserved byte (Reserved), tag, payload (pdu), CRC. The format of the tag may be defined by reference to the following: the tag is 32 bits with the upper 16 bits reserved and only the lower 16 bits used, and its position is between the reserved bytes and payload of the packet.
Network delay refers to the transmission of various data in a network medium through a network protocol (such as TCP/IP, video networking protocol), and if the amount of information is too large and not limited, the excessive network traffic will cause slow response of the device, resulting in network delay. There are many factors that contribute to network latency. Further, in the video network, the video network carries data forwarding, which requires some specific network parameters to measure the performance of the video network, and the data forwarding delay is an important performance parameter, which measures the network delay caused by the video network tunnel when transmitting the user data. In the prior art, a PING instruction is used for detecting time delay, but the detection result is not accurate.
FIG. 5 illustrates a system architecture diagram to which embodiments of the present application may be applied. The first switch and the second switch in the embodiment of the application are convergence/access switches in the video networking, are used for expanding the application of a video networking platform in order to meet the application requirement of a video networking user for accessing a non-video networking (internet, an IPTV private network, a service private network in other fields, and the like), are access equipment for carrying the existing network application based on an IP system in the video networking, and realize the conversion of V2V data and IP data.
The video network tunnel in the embodiment of the application is a point-to-point video network tunnel established among video network terminals and used for bearing data messages. The user accesses the tunnel of the video network from one side of the tunnel, and accesses the servers such as the Internet, the IPTV private network or other field service private networks and the like from the other side of the tunnel, thereby realizing 'IP inside the building and video connection outside the building'. The video network server is responsible for establishing a video network tunnel between video network terminals, forwarding a video network protocol message, forwarding video network data and the like. The video networking delay in the embodiment of the application is the end-to-end data forwarding time delay of a video networking tunnel formed by two switches.
Fig. 6 shows a time delay detection method based on a video network according to an embodiment of the present application, where a user may detect a tunnel time delay parameter, monitor a time delay characteristic of a tunnel in real time, and collect a measurement frame time delay. The method is applicable to a switch and comprises the following steps:
step 601: the first switch constructs a first message according to the main type of the head of the video networking message, the first subtype of the video networking message and a first timestamp Ti1, and sends the first message to a second switch; the first timestamp Ti1 is a time value when the first switch sends the first packet.
In step 601, the first switch sends the first message to the second switch through the video network tunnel, the first message is further encapsulated with a corresponding video network tunnel identifier, and the video network terminal has a plurality of tunnels for testing one video network tunnel, so that the time delay detection message encapsulates the related information of the tunnel and sends the information to the corresponding tunnel.
Step 602: receiving a second message sent by the second switch, wherein the second message is formed by stamping a second timestamp Ti2 on the first message, removing the encapsulation of the head of the video networking message of the first message and encapsulating the head of the video networking message according to a third timestamp Ti3 and a second subtype of the video networking message when the main type of the head of the video networking message of the first message is matched with the first subtype of the video networking message set by the second switch in a video networking message rule; the second timestamp Ti2 is a time value when the first packet arrives at the second switch, and the third timestamp Ti3 is a time value when the second packet is sent by the second switch.
fig. 7 shows a format schematic diagram of a delay detection message (first message) provided in the embodiment of the present application, and fig. 8 shows a format schematic diagram of a delay detection response message (second message) provided in the embodiment of the present application. The rule defining the characteristic field of the delay detection packet may be: the message main type of the head of the video network is 4001 (the data message main type is 4002, and the other protocol message main types are 4001); setting a message subtype 03 as a delay detection request message type (and reserving the expansion capability of other protocol messages); and setting the message subtype 04 as a delay detection response message type.
In a possible implementation manner, the first subtype of the video networking message is a video networking tunnel link delay request message type set by the first switch; the second subtype of the video networking message is a video networking tunnel link time response message type set by the second switch.
step 603: when the main type of the head of the video networking message and the second subtype of the video networking message of the second message are matched with the rule of the video networking message set by the first switch, marking a fourth timestamp Ti4 on the second message; the fourth timestamp Ti4 is a time value at which the first switch receives the second packet.
step 604: determining a video networking tunnel link latency between the first switch and the second switch according to the first timestamp Ti1, the second timestamp Ti2, the third timestamp Ti3 and the fourth timestamp Ti 4.
the link time delay of the video network tunnel comprises link bidirectional time delay, link unidirectional time delay and store-and-forward time delay; the link bidirectional time delay is calculated according to the difference value of the fourth time stamp Ti4 and the first time stamp Ti 1; the link one-way delay is calculated from half the difference between the fourth timestamp Ti4 and the first timestamp Ti 1; the store-and-forward delay is calculated from the difference between the third timestamp Ti3 and the second timestamp Ti 2.
In step 604, the difference between the fourth timestamp Ti4 and the first timestamp Ti1 is calculated to obtain the link bidirectional delay (Ti4-Ti 1). Half of the difference between said fourth timestamp Ti4 and said first timestamp Ti1 is calculated resulting in a link one-way delay (Ti4-Ti1) ÷ 2. And calculating the difference value between the third timestamp Ti3 and the second timestamp Ti2 to obtain the store-and-forward time delay Ti3-Ti2 of the second video network terminal.
In a possible implementation manner, in step 601, the first packet is sent to the second switch according to a set delay detection period; the time stamps of each set time delay detection period are respectively a first time stamp Ti1, a second time stamp Ti2, a third time stamp Ti3 and a fourth time stamp Ti4, i represents the loop-back frequency of time delay detection, and i is an integer greater than 1; further, calculating the maximum time delay, the minimum time delay and the average time delay in the bi-directional time delays of the links of i times; and evaluating the performance of the tunnel link of the video network according to the maximum delay, the minimum delay and the average delay in the bi-directional delays of the i links.
Thus, i sets of timestamp parameters are obtained altogether. For example, the first timestamp of the 1 st loop is T11, the second timestamp is T12, the third timestamp is T13, and the fourth timestamp is T14. The first timestamp of the 2 nd loopback is T21, the second timestamp is T22, the third timestamp is T23, and the fourth timestamp is T24 … … statistics many times, and statistics maximum time delay, minimum time delay, average time delay. The statistical results include maximum, minimum, average delay. As shown in fig. 10, the latency statistics result displays the latest 60 sets of timestamp parameters at the first video network terminal. For example, count the last 60 delays: with a 60-deep circular linked list, only 60 test results can be retained at most, and the previous statistics are refreshed in a new time. The latest test result of each statistic is placed at the top. And monitoring the time delay attribute of the video network tunnel by calculating the jitter value of the time delay, and determining whether the video network link is stable. Wherein, the closer the maximum delay, the minimum delay and the average delay are to each other, the better the jitter is. That is, the emphasis is evaluated from two dimensions: firstly, the smaller the delay, the better, and secondly, the smaller the delay jitter, the better.
fig. 9 is a schematic overall flow chart of the delay detection method according to the embodiment of the present application. The first switch and the second switch in the time delay detection method provided by the embodiment of the application can be a visual united cat or a visual united cat king. The internet of view cat is a product for expanding the application research and development of the internet of view platform in order to meet the application requirements of users of the internet of view to access non-internet of view (internet, IPTV private network, special field service private network, etc.), and is an access device for the internet of view to bear the existing network application based on the IP system. The King of the Internet of things aims to meet the application requirements of users of the Internet of things for accessing non-Internet of things (the Internet, an IPTV special network, other field service special networks and the like), and expands a product for the application and research of an Internet of things platform, and the King of the Internet of things is convergence equipment for the Internet of things to bear the existing network application based on an IP system. The tunnel of the video network is a point-to-point tunnel of the video network established by the cat and the king of the cat, a user accesses the tunnel of the video network from one side of the tunnel and accesses the other side of the tunnel (servers such as the internet, IPTV private network, business private network in other fields, and the like, realizing the 'inside IP and outside video connection')
Any one of them can initiate the delay test, and suppose the cat view is used as the initiating end of the delay test: when a user initiates a time delay test, a CPU/FPGA of the cat looks at constructs a time delay detection message: and taking the head package of the video network corresponding to the tunnel, changing the main type of the head information into 4001, setting the subtype 03 of the message, stamping a timestamp T1, and sending the delay detection message to the corresponding video network tunnel to be detected from the video network port. Through the tunnel, the time delay detection message is sent to the opposite-end view Union Cat, the opposite end sets up the message uploading rule, when the message type field is 4001, the message is uploaded to the CPU, the CPU judges that the message subtype is 03 and represents the time delay detection request message, and a time stamp R1 is marked; i.e. the cat owner is time stamped with a time stamp R1 before processing the message. And the cat king repackages the message, removes the head of the video network corresponding to the head of the video network, stamps a timestamp T2, sets a message subtype 04, and sends the message back to the tunnel. And (3) detecting a response message through the time delay of the tunnel of the video network, returning the response message to the video modem, uploading the response message to a CPU (central processing unit) according to a rule 4001 before the video modem processes and calculates, judging that the subtype is 04, and stamping a time stamp R2. At this time, the message with 4 timestamps, T1, R1, T2 and R2, is sent to the delay processing module to calculate each delay statistic time.
in summary, according to the time delay detection method based on the video network provided by the embodiment of the present application, the first switch receives a time delay detection instruction sent by a user; constructing a first message according to the main type of the head of the video networking message, the first subtype of the video networking message and the first timestamp Ti1, and sending the first message to a second switch; the first timestamp Ti1 is a time value when the first switch sends the first packet; receiving a second message sent by the second switch, wherein the second message is formed by stamping a second timestamp Ti2 on the first message, removing the encapsulation of the head of the video networking message of the first message and encapsulating the head of the video networking message according to a third timestamp Ti3 and a second subtype of the video networking message when the main type of the head of the video networking message of the first message is matched with the first subtype of the video networking message set by the second switch in a video networking message rule; the second timestamp Ti2 is a time value when the first packet arrives at the second switch, and the third timestamp Ti3 is a time value when the second packet is sent by the second switch; when the main type of the head of the video networking message and the second subtype of the video networking message of the second message are matched with the rule of the video networking message set by the first switch, marking a fourth timestamp Ti4 on the second message; the fourth timestamp Ti4 is a time value at which the first switch receives the second packet; determining a video networking tunnel link latency between the first switch and the second switch according to the first timestamp Ti1, the second timestamp Ti2, the third timestamp Ti3 and the fourth timestamp Ti 4. Therefore, by combining the characteristics of the video network message, the time delay parameter of the video network tunnel can be calculated more accurately than the prior art. Therefore, the user can check the time delay state of the detection link in real time, and the video network can be maintained better.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the embodiments are not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the embodiments. Further, those skilled in the art will also appreciate that the embodiments described in the specification are presently preferred and that no particular act is required of the embodiments of the application.
based on the same technical concept, referring to fig. 11, a structural block diagram of a switch provided in the embodiment of the present application is shown, where the apparatus may be applied in a video network, and specifically may include the following modules:
The message constructing and sending module 1101 is configured to construct, by the first switch, a first message according to the main type of the header of the video networking message, the first subtype of the video networking message, and the first timestamp Ti1, and send the first message to the second switch; the first timestamp Ti1 is a time value when the first switch sends the first packet.
A receiving module 1102, configured to receive a second message sent by the second switch, where the second message is formed by stamping a second timestamp Ti2 on the first message, removing encapsulation of the video networking message header of the first message, and encapsulating the first message according to a third timestamp Ti3 and a second subtype of the video networking message when the video networking message header main type and the first subtype of the video networking message of the first message are matched with a video networking message rule set by the second switch; the second timestamp Ti2 is a time value when the first packet arrives at the second switch, and the third timestamp Ti3 is a time value when the second packet is sent by the second switch.
A timestamp module 1103, configured to mark a fourth timestamp Ti4 on the second packet when the video networking packet header main type and the video networking packet second subtype of the second packet match the set video networking packet rule of the first switch; the fourth timestamp Ti4 is a time value at which the first switch receives the second packet.
A latency determining module 1104, configured to determine a video network tunnel link latency between the first switch and the second switch according to the first timestamp Ti1, the second timestamp Ti2, the third timestamp Ti3, and the fourth timestamp Ti 4.
In one possible implementation, the link delay of the video networking tunnel comprises link bidirectional delay, link unidirectional delay and store-and-forward delay; the link bidirectional time delay is calculated according to the difference value of the fourth time stamp Ti4 and the first time stamp Ti 1; the link one-way delay is calculated from half the difference between the fourth timestamp Ti4 and the first timestamp Ti 1; the store-and-forward delay is calculated from the difference between the third timestamp Ti3 and the second timestamp Ti 2.
In a possible implementation manner, the message structure sending module 1101 is specifically configured to: sending the first message to the second switch according to a set time delay detection period; the timestamps of each set delay detection period are respectively a first timestamp Ti1, a second timestamp Ti2, a third timestamp Ti3 and a fourth timestamp Ti4, i represents the loop-back frequency of delay detection, and i is an integer greater than 1.
The delay determining module 1104 is further configured to: calculating the maximum time delay, the minimum time delay and the average time delay in the bi-directional time delays of the links for i times; and evaluating the performance of the tunnel link of the video network according to the maximum delay, the minimum delay and the average delay in the bi-directional delays of the i links.
In a possible implementation manner, the first subtype of the video networking message is a video networking tunnel link delay request message type set by the first switch; the second subtype of the video networking message is a video networking tunnel link time response message type set by the second switch.
for the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
the embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
the embodiment of the present application further provides a computer device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, the processor implements one or more of the foregoing methods for detecting latency based on video networking.
embodiments of the present application further provide a computer-readable storage medium, which stores a computer program to enable a processor to execute the method for detecting latency based on video networking according to the embodiments of the present application.
as will be appreciated by one of skill in the art, embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
these computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be 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 terminal 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 terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The foregoing provides a time delay detection method and switch based on video networking. The detailed description is given, and the principle and the implementation of the present application are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A time delay detection method based on video network is characterized by comprising the following steps:
The first switch constructs a first message according to the main type of the head of the video networking message, the first subtype of the video networking message and a first timestamp Ti1, and sends the first message to a second switch; the first timestamp Ti1 is a time value when the first switch sends the first packet;
receiving a second message sent by the second switch, wherein the second message is formed by stamping a second timestamp Ti2 on the first message, removing the encapsulation of the head of the video networking message of the first message and encapsulating the head of the video networking message according to a third timestamp Ti3 and a second subtype of the video networking message when the main type of the head of the video networking message of the first message is matched with the first subtype of the video networking message set by the second switch in a video networking message rule; the second timestamp Ti2 is a time value when the first packet arrives at the second switch, and the third timestamp Ti3 is a time value when the second packet is sent by the second switch;
when the main type of the head of the video networking message and the second subtype of the video networking message of the second message are matched with the rule of the video networking message set by the first switch, marking a fourth timestamp Ti4 on the second message; the fourth timestamp Ti4 is a time value at which the first switch receives the second packet;
determining a video networking tunnel link latency between the first switch and the second switch according to the first timestamp Ti1, the second timestamp Ti2, the third timestamp Ti3 and the fourth timestamp Ti 4.
2. The method of claim 1, wherein the internet of view tunnel link latency comprises a link bi-directional latency, a link unidirectional latency, and a store-and-forward latency;
The link bidirectional time delay is calculated according to the difference value of the fourth time stamp Ti4 and the first time stamp Ti 1;
the link one-way delay is calculated from half the difference between the fourth timestamp Ti4 and the first timestamp Ti 1;
The store-and-forward delay is calculated from the difference between the third timestamp Ti3 and the second timestamp Ti 2.
3. The method of claim 1 or 2, wherein sending the first message to a second switch comprises:
Sending the first message to the second switch according to a set time delay detection period; the time stamps of each set time delay detection period are respectively a first time stamp Ti1, a second time stamp Ti2, a third time stamp Ti3 and a fourth time stamp Ti4, i represents the loop-back frequency of time delay detection, and i is an integer greater than 1;
the determining of the video networking tunnel link latency between the first switch and the second switch according to the first timestamp Ti1, the second timestamp Ti2, the third timestamp Ti3 and the fourth timestamp Ti4 further comprises:
Calculating the maximum time delay, the minimum time delay and the average time delay in the bi-directional time delays of the links for i times;
And evaluating the performance of the tunnel link of the video network according to the maximum delay, the minimum delay and the average delay in the bi-directional delays of the i links.
4. The method of claim 1, wherein the first subtype of the internet of view packet is an internet of view tunnel link delay request packet type set by the first switch;
The second subtype of the video networking message is a video networking tunnel link time response message type set by the second switch.
5. A switch, characterized in that the switch comprises:
The message construction and sending module is used for constructing a first message by the first switch according to the main type of the head of the video networking message, the first subtype of the video networking message and the first timestamp Ti1 and sending the first message to the second switch; the first timestamp Ti1 is a time value when the first switch sends the first packet;
the receiving module is used for receiving a second message sent by the second switch, and the second message is formed by stamping a second timestamp Ti2 on the first message, removing the encapsulation of the head of the video networking message of the first message and encapsulating the head of the video networking message according to a third timestamp Ti3 and a second subtype of the video networking message when the main type of the head of the video networking message of the first message and the first subtype of the video networking message are matched with the rule of the video networking message set by the second switch; the second timestamp Ti2 is a time value when the first packet arrives at the second switch, and the third timestamp Ti3 is a time value when the second packet is sent by the second switch;
the timestamp module is used for marking a fourth timestamp Ti4 on the second message when the main type of the head of the video networking message of the second message and the second subtype of the video networking message are matched with the set video networking message rule of the first switch; the fourth timestamp Ti4 is a time value at which the first switch receives the second packet;
a latency determination module, configured to determine a video network tunnel link latency between the first switch and the second switch according to the first timestamp Ti1, the second timestamp Ti2, the third timestamp Ti3, and the fourth timestamp Ti 4.
6. the switch of claim 5, wherein the video networking tunnel link latency comprises a link bi-directional latency, a link unidirectional latency, and a store-and-forward latency;
The link bidirectional time delay is calculated according to the difference value of the fourth time stamp Ti4 and the first time stamp Ti 1;
The link one-way delay is calculated from half the difference between the fourth timestamp Ti4 and the first timestamp Ti 1;
the store-and-forward delay is calculated from the difference between the third timestamp Ti3 and the second timestamp Ti 2.
7. The switch according to claim 5 or 6, wherein the message structure sending module is specifically configured to:
Sending the first message to the second switch according to a set time delay detection period; the time stamps of each set time delay detection period are respectively a first time stamp Ti1, a second time stamp Ti2, a third time stamp Ti3 and a fourth time stamp Ti4, i represents the loop-back frequency of time delay detection, and i is an integer greater than 1;
the delay determining module is further configured to:
calculating the maximum time delay, the minimum time delay and the average time delay in the bi-directional time delays of the links for i times;
and evaluating the performance of the tunnel link of the video network according to the maximum delay, the minimum delay and the average delay in the bi-directional delays of the i links.
8. the switch of claim 5, wherein the first subtype of the video networking message is a video networking tunneling delay request message type set by the first switch;
The second subtype of the video networking message is a video networking tunnel link time response message type set by the second switch.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 4 when executing the computer program.
10. a computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 4.
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Application publication date: 20191206 |