CN111565096A - Data transmission method and device - Google Patents
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- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
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Abstract
The embodiment of the invention provides a data transmission method and a data transmission device, which are applied to a video network, wherein the method comprises the following steps: sending a data frame which is packed in advance and is associated with data to be sent to a receiver; receiving a control frame sent by the receiver; the control frame contains the receiving information of the data frame; determining target data frames which are not successfully transmitted in the data frames according to the receiving information; and retransmitting the target data frame. The target data frame which is not successfully transmitted is determined by using the control frame, and the target data frame is retransmitted, so that the reliability of data transmission is improved, the service stability is improved, and the stability of the video network is ensured.
Description
Technical Field
The invention relates to the technical field of video networking, in particular to a data transmission method and device.
Background
With the development of video networking, video networking data transmission has also developed as an important branch of the video networking technology field.
Currently, terminal communication devices connected to a video network perform video network data transmission by using a basic endpoint transmission mechanism, where the basic endpoint transmission mechanism includes: link layer, network layer, transport layer, and service layer.
However, during the data transmission process, the transport layer of the base endpoint transport mechanism may lose data, which may cause service interruption and reduce the reliability of the video network.
Disclosure of Invention
In view of the above, embodiments of the present invention are proposed to provide a data transmission method and apparatus that overcome or at least partially solve the above problems.
In order to solve the above problem, an embodiment of the present invention provides a data transmission method, which is applied to a video network, and the method includes:
sending a data frame which is packed in advance and is associated with data to be sent to a receiver;
receiving a control frame sent by the receiver; the control frame contains the receiving information of the data frame;
determining target data frames which are not successfully transmitted in the data frames according to the receiving information;
and retransmitting the target data frame.
Optionally, after the retransmitting the target data frame, the method further includes:
and updating the data frame related to the data to be sent according to the target data frame.
Optionally, the determining, according to the reception information, a target data frame that is not successfully transmitted in the data frames includes:
acquiring a frame sequence number of the data frame contained in the receiving information;
determining the missing target frame sequence number in the frame sequence numbers;
and determining the corresponding target data frame which is not successfully transmitted according to the target frame sequence number.
Optionally, the sending the pre-packed data frame associated with the data to be sent to the receiver includes:
transmitting the data frame which is packed in advance and is associated with the data to be transmitted to a transmission queue;
and sending the data frame to a receiving queue of the receiving party through the sending queue.
In order to solve the above problem, an embodiment of the present invention provides a data transmission apparatus, which is applied to a video network, and the apparatus includes:
the first sending module is used for sending the data frame which is packed in advance and is associated with the data to be sent to a receiving party;
a receiving module, configured to receive a control frame sent by the receiving party; the control frame contains the receiving information of the data frame;
the determining module is used for determining target data frames which are not successfully transmitted in the data frames according to the receiving information;
and the second sending module is used for resending the target data frame.
Optionally, the apparatus further comprises:
and the updating module is used for updating the data frame related to the data to be sent according to the target data frame.
Optionally, the determining module includes:
an obtaining submodule, configured to obtain a frame number of the data frame included in the reception information;
the first determining submodule is used for determining the missing target frame serial number in the frame serial numbers;
and the second determining submodule is used for determining the corresponding target data frame which is not successfully sent according to the target frame sequence number.
Optionally, the first sending module comprises:
the transmission submodule is used for transmitting the data frame which is packed in advance and is associated with the data to be transmitted to a transmission queue;
and the sending submodule is used for sending the data frame to a receiving queue of the receiving party through the sending queue.
In order to solve the above problem, an embodiment of the present invention provides an electronic device, including:
one or more processors; and
one or more machine readable media having instructions stored thereon that, when executed by the one or more processors, cause the apparatus to perform the above-described data transmission methods.
In order to solve the above problem, an embodiment of the present invention provides a computer-readable storage medium storing a computer program that causes a processor to execute the above data transmission method.
The embodiment of the invention has the following advantages:
in the embodiment of the present invention, the terminal device may send the data frame associated with the data to be sent, which is packed in advance, to the receiver; and then receiving a control frame sent by a receiver, wherein the control frame comprises receiving information of the data frame, then determining an object data frame which is not successfully sent in the data frame according to the receiving information, and finally, resending the object data frame. The target data frame which is not successfully transmitted is determined by using the control frame, and the target data frame is retransmitted, so that the reliability of data transmission is improved, the service stability is improved, and the stability of the video network is ensured.
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Fig. 1 is a flowchart illustrating a data transmission method according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a data transmission method according to a second embodiment of the present invention;
fig. 3 shows a block diagram of a data transmission apparatus according to a third embodiment of the present invention;
FIG. 4 illustrates a networking diagram of a video network of the present invention;
FIG. 5 is a schematic diagram of a hardware architecture of a node server according to the present invention;
fig. 6 shows a hardware architecture diagram of an access switch of the present invention;
fig. 7 is a schematic diagram illustrating a hardware structure of an ethernet protocol conversion gateway according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, a flowchart illustrating steps of a data transmission method according to an embodiment of the present invention is shown, where the method may be applied to a video network, and specifically includes the following steps:
In the invention, the terminal equipment can transmit the data frame which is packed in advance and is associated with the data to be transmitted to the transmission queue, and then the data frame is transmitted to the receiving queue of the receiving party through the transmission queue. Wherein each data frame includes a sequence number assigned by the terminal device.
A Data Frame (Data Frame) is a carrier that carries Data. The type field in the header of the data frame will identify which type the frame belongs to.
The receiving party can be a 64 autonomous server, which is called as: 64-bit autonomous server system, an upgraded version of the original video network. The 64-bit autonomous server comprises main equipment: the system comprises a main control device, a branch control device, a boundary router and a terminal device.
Specifically, the master control device is the brain of the whole autonomous server and is divided into an internet port and a video network port. The internet port receives service instructions (such as starting a conference, stopping the conference and the like), and the main control equipment analyzes the internet packet to obtain the service instructions and then sends the relevant service instructions to the video network through the video network port.
In some examples, the terminal device may be connected to a sub-control device, and the terminal may be a computer, a camera monitoring device, a video network terminal device, or the like.
It should be understood that the above examples are only examples for better understanding of the technical solutions of the embodiments of the present invention, and are not to be taken as the only limitation of the embodiments of the present invention.
After transmitting the pre-packed data frame associated with the data to be transmitted to the receiver, step 502 is performed.
In the invention, the control frame can be used for collecting the proportion information of the statistical data frame, and determining how to adjust the frame sending length of each Station (Station) according to the proportion information, then the access point feeds back the adjustment information to each Station in the network through the beacon frame broadcasted regularly, and each Station adjusts the sending frame length thereof according to the adjustment information in the received beacon frame. The control frames, also called S-frames, are used for error control and flow control.
After the terminal equipment receives the control frame sent by the receiving party, the control frame is put into a receiving queue, wherein the control frame waits for the processing of the service layer. The service layer refers to the content used to encapsulate the communication between the entities of the service layer.
In addition, the data transmission protocol is defined above a Media Access Control (MAC) layer, and is divided into a link layer, a network layer, a transport layer, and a service layer. The link layer is a standard Ethernet MAC layer protocol, the network layer is used for encapsulating the load data of the transmission layer, and the transmission layer is used for encapsulating the load data of the service layer.
Receiving a control frame sent by a receiving party; after the control frame contains the reception information of the data frame, step 503 is performed.
In the invention, the terminal equipment can firstly acquire the frame number of the data frame contained in the receiving information, determine the missing target frame number in the frame number, and finally determine the corresponding target data frame which is not successfully sent according to the target frame number.
After determining that the target data frame is not successfully transmitted in the data frames according to the received information, step 504 is performed.
And after the terminal equipment determines the target data frame which is not successfully transmitted in the data frame, transmitting a retransmission instruction of the target data frame so as to retransmit the target data frame.
In the present invention, since the transport layer determines the transmission policy, it is defined as a reliable data transmission mode, i.e. the reliable endpoint transmission mode uses the related information of control frame transmission and retransmission and uses the data frame number to position the data to be retransmitted.
In the embodiment of the present invention, the terminal device may send the data frame associated with the data to be sent, which is packed in advance, to the receiver; and then receiving a control frame sent by a receiver, wherein the control frame comprises receiving information of the data frame, then determining an object data frame which is not successfully sent in the data frame according to the receiving information, and finally, resending the object data frame. The target data frame which is not successfully transmitted is determined by using the control frame, and the target data frame is retransmitted, so that the reliability of data transmission is improved, the service stability is improved, and the stability of the video network is ensured.
Referring to fig. 2, a flowchart illustrating steps of a data transmission method according to a second embodiment of the present invention is shown, where the method may be applied to a video network, and specifically may include the following steps:
In the invention, the terminal equipment can transmit the data frame which is packed in advance and is associated with the data to be transmitted to the transmission queue, and then the data frame is transmitted to the receiving queue of the receiving party through the transmission queue. Wherein each data frame includes a sequence number assigned by the terminal device.
A Data Frame (Data Frame) is a carrier that carries Data. The type field in the header of the data frame will identify which type the frame belongs to.
The receiving party can be a 64 autonomous server, which is called as: 64-bit autonomous server system, an upgraded version of the original video network. The 64-bit autonomous server comprises main equipment: the system comprises a main control device, a branch control device, a boundary router and a terminal device.
Specifically, the master control device is the brain of the whole autonomous server and is divided into an internet port and a video network port. The internet port receives service instructions (such as starting a conference, stopping the conference and the like), and the main control equipment analyzes the internet packet to obtain the service instructions and then sends the relevant service instructions to the video network through the video network port.
In some examples, the terminal device may be connected to a sub-control device, and the terminal may be a computer, a camera monitoring device, a video network terminal device, or the like.
It should be understood that the above examples are only examples for better understanding of the technical solutions of the embodiments of the present invention, and are not to be taken as the only limitation of the embodiments of the present invention.
After transmitting the pre-packed data frame associated with the data to be transmitted to the receiving side, step 602 is performed.
In the invention, the control frame can be used for collecting the proportion information of the statistical data frame, and determining how to adjust the frame sending length of each Station (Station) according to the proportion information, then the access point feeds back the adjustment information to each Station in the network through the beacon frame broadcasted regularly, and each Station adjusts the sending frame length thereof according to the adjustment information in the received beacon frame. The control frames, also called S-frames, are used for error control and flow control.
After receiving the control frame sent by the receiving party, the terminal device puts the control frame into a receiving queue, wherein the control frame waits for the processing of the service layer. The service layer refers to the content used to encapsulate the communication between the entities of the service layer.
In addition, the data transmission protocol is defined above a Media Access Control (MAC) layer, and is divided into a link layer, a network layer, a transport layer, and a service layer. The link layer is a standard Ethernet MAC layer protocol, the network layer is used for encapsulating the load data of the transmission layer, and the transmission layer is used for encapsulating the load data of the service layer.
Receiving a control frame sent by a receiving party; after the control frame contains the received information of the data frame, step 603 is performed.
In the invention, the terminal equipment can firstly acquire the frame number of the data frame contained in the receiving information, determine the missing target frame number in the frame number, and finally determine the corresponding target data frame which is not successfully sent according to the target frame number.
After determining that the target data frame is not successfully transmitted in the data frames according to the received information, step 604 is performed.
And after the terminal equipment determines the target data frame which is not successfully transmitted in the data frame, transmitting a retransmission instruction of the target data frame so as to retransmit the target data frame.
In the present invention, since the transport layer determines the transmission policy, it is defined as a reliable data transmission mode, i.e. the reliable endpoint transmission mode uses the related information of control frame transmission and retransmission and uses the data frame number to position the data to be retransmitted.
After the target data frame is retransmitted, step 605 is performed.
And after the terminal equipment retransmits the target data frame, updating the data frames of the transmitting queue and the receiving queue according to the target data frame, and ensuring that the data frames of the transmitting queue and the receiving queue are complete.
Specifically, the terminal device sends the sending queue to the 64 autonomous servers, and after the 64 autonomous servers are used as receivers to process the data frames of the receiving queue in the service layer, the related information of the receiving queue is updated according to the target data frames.
It should be noted that, since the transport layer determines the transmission policy, it is defined as a reliable data transmission mode, i.e. the reliable endpoint transmission mode uses the related information of control frame transmission and retransmission and uses the data frame number to locate the data to be retransmitted in the embodiment of the present invention. The transmission channel in the data transmission mode may be opened as a bidirectional channel, and thus a terminal device (sender) and a 64-bit autonomous server (receiver) participating in communication.
In the embodiment of the present invention, the terminal device may send the data frame associated with the data to be sent, which is packed in advance, to the receiver, and receive the control frame sent by the receiver; the control frame comprises receiving information of the data frame, the target data frame which is not successfully transmitted in the data frame is determined according to the receiving information, the target data frame is retransmitted, and the data frame related to the data to be transmitted is updated according to the target data frame. The target data frame which is not successfully transmitted is determined by using the control frame, and the target data frame is retransmitted, so that the reliability of data transmission is improved, the service stability is improved, and the stability of the video network is ensured.
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 present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Referring to fig. 3, a block diagram of a data transmission apparatus according to a third embodiment of the present invention is shown, where the data transmission apparatus 700 may be applied to a video network, and the apparatus specifically includes:
a first sending module 701, configured to send a data frame associated with data to be sent, which is packed in advance, to a receiving party;
a receiving module 702, configured to receive a control frame sent by a receiving party; the control frame contains the received information of the data frame;
a determining module 703, configured to determine, according to the received information, a target data frame that is not successfully transmitted in the data frames;
a second sending module 704, configured to resend the target data frame.
Optionally, the apparatus further comprises:
and the updating module is used for updating the data frame related to the data to be sent according to the target data frame.
Optionally, the determining module includes:
the acquisition submodule is used for acquiring the frame number of the data frame contained in the received information;
the first determining submodule is used for determining the missing target frame serial number in the frame serial numbers;
and the second determining submodule is used for determining the corresponding target data frame which is not successfully sent according to the target frame sequence number.
Optionally, the first sending module comprises:
the transmission submodule is used for transmitting the data frames which are packed in advance and are associated with the data to be transmitted to the transmission queue;
and the sending submodule is used for sending the data frame to a receiving queue of a receiving party through the sending queue.
In the embodiment of the invention, the terminal equipment can send the data frame which is packed in advance and is associated with the data to be sent to the receiver through the first sending module; and then, receiving a control frame sent by a receiver through a receiving module, wherein the control frame comprises receiving information of the data frame, then, determining an object data frame which is not successfully sent in the data frame according to the receiving information through a determining module, and finally, resending the object data frame through a second sending module. The target data frame which is not successfully transmitted is determined by using the control frame, and the target data frame is retransmitted, so that the reliability of data transmission is improved, the service stability is improved, and the stability of the video network is ensured.
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.
An embodiment of the present invention further provides an electronic device, including:
one or more processors; and
one or more machine readable media having instructions stored thereon that, when executed by the one or more processors, cause the apparatus to perform the data transmission methods described above.
The embodiment of the invention also provides a computer readable storage medium, which stores a computer program for enabling a processor to execute the data transmission method.
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 invention, 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 Packet Switching is adopted by the technology of the video networking to meet the Streaming requirement. 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. 4, 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 (the part in the dotted circle), 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 invention 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. 5, 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. 6, the network interface module (downlink network interface module 301, uplink network interface module 302), switching engine module 303 and 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, and 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 of the present invention 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) obtaining a token generated by a 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 308 is configured by the CPU module 304, 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 conversion gateway：
As shown in fig. 7, the apparatus 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, and a MAC deleting 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 destination address DA of the packet, adds the ethernet MAC DA of the terminal, the MACSA 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 2 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 |
wherein:
the Destination Address (DA) is composed of 8 bytes (byte), the first byte represents the type of the data packet (such as various protocol packets, multicast data packets, unicast data packets, etc.), there are 256 possibilities at most, 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 different types of datagrams, and is 64 bytes if the datagram is various types of protocol packets, and is 32+1024 or 1056 bytes if the datagram is a unicast packet, of course, the length 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 invention: a label to uniquely describe a metropolitan area network device.
In this specification, the definition of the Label is similar to that of the Label of MPLS (Multi-Protocol Label Switch), and assuming that there are two connections between the device a and the device B, there are 2 labels for the packet from the device a to the device B, and 2 labels for the 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.
Based on the characteristics of the video network, one of the core concepts of the embodiment of the invention is provided, and the terminal equipment can send the data frame which is packed in advance and is associated with the data to be sent to a receiver; and then receiving a control frame sent by a receiver, wherein the control frame comprises receiving information of the data frame, then determining an object data frame which is not successfully sent in the data frame according to the receiving information, and finally, resending the object data frame. The target data frame which is not successfully transmitted is determined by using the control frame, and the target data frame is retransmitted, so that the reliability of data transmission is improved, the service stability is improved, and the stability of the video network is ensured.
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.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention 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 invention 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 invention 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 invention. 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 invention 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 preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
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 data transmission method and apparatus provided by the present invention are described in detail above, and a specific example is applied in the text to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, 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 invention.
Claims (10)
1. A data transmission method applied to a video network, the method comprising:
sending a data frame which is packed in advance and is associated with data to be sent to a receiver;
receiving a control frame sent by the receiver; the control frame contains the receiving information of the data frame;
determining target data frames which are not successfully transmitted in the data frames according to the receiving information;
and retransmitting the target data frame.
2. The method of claim 1, further comprising, after said retransmitting said target data frame:
and updating the data frame related to the data to be sent according to the target data frame.
3. The method of claim 1, wherein the determining, according to the reception information, a target data frame that is not successfully transmitted from the data frames comprises:
acquiring a frame sequence number of the data frame contained in the receiving information;
determining the missing target frame sequence number in the frame sequence numbers;
and determining the corresponding target data frame which is not successfully transmitted according to the target frame sequence number.
4. The method of claim 1, wherein sending the pre-packed data frames associated with the data to be sent to a receiving side comprises:
transmitting the data frame which is packed in advance and is associated with the data to be transmitted to a transmission queue;
and sending the data frame to a receiving queue of the receiving party through the sending queue.
5. A data transmission apparatus, applied to a video network, the apparatus comprising:
the first sending module is used for sending the data frame which is packed in advance and is associated with the data to be sent to a receiving party;
a receiving module, configured to receive a control frame sent by the receiving party; the control frame contains the receiving information of the data frame;
the determining module is used for determining target data frames which are not successfully transmitted in the data frames according to the receiving information;
and the second sending module is used for resending the target data frame.
6. The apparatus of claim 5, further comprising:
and the updating module is used for updating the data frame related to the data to be sent according to the target data frame.
7. The apparatus of claim 5, wherein the determining module comprises:
an obtaining submodule, configured to obtain a frame number of the data frame included in the reception information;
the first determining submodule is used for determining the missing target frame serial number in the frame serial numbers;
and the second determining submodule is used for determining the corresponding target data frame which is not successfully sent according to the target frame sequence number.
8. The apparatus of claim 5, wherein the first sending module comprises:
the transmission submodule is used for transmitting the data frame which is packed in advance and is associated with the data to be transmitted to a transmission queue;
and the sending submodule is used for sending the data frame to a receiving queue of the receiving party through the sending queue.
9. An electronic device, comprising:
one or more processors; and
one or more machine-readable media having instructions stored thereon that, when executed by the one or more processors, cause the apparatus to perform the data transmission method of any of claims 1-4.
10. A computer-readable storage medium, characterized in that it stores a computer program that causes a processor to execute the data transmission method of any one of claims 1 to 4.
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