WO2009021417A1

WO2009021417A1 - A method, system and device for transmitting and receiving the network data

Info

Publication number: WO2009021417A1
Application number: PCT/CN2008/071343
Authority: WO
Inventors: Zhigang Ye
Original assignee: Shenzhen Coship Electronics Co., Ltd.
Priority date: 2007-08-14
Filing date: 2008-06-18
Publication date: 2009-02-19
Also published as: CN101202604A; CN101202604B

Abstract

A method, system and device for transmitting and receiving the network data are provided. The transmitting method includes the following steps: the original data packet which is greater than the set bytes is split into multiple small data packets; the small data packets are identified; the identified small data packets are transmitted; when the re-transmission request is received, the corresponding small data packets are re-transmitted according to the identifiers of the small data packets which are carried by the re-transmission request. In the embodiments of the present invention, the loss of the data packet during the transmission is reduced by splitting the original data packet into multiple small data packets, the network data receiver transmits the re-transmission request when detecting the loss of the small data packet, the network data transmitter re-transmits the lost small data packet, thereby reducing the loss of the data packet during the network data transmission.

Description

Method, system and device for transmitting and receiving network data

This application claims priority to Chinese Patent Application No. 200710075745.4, entitled "A Method for Sending and Receiving Network Data, System and Equipment", filed on August 14, 2007, the entire contents of which are hereby incorporated by reference. The citations are incorporated herein by reference.

Technical field

The present invention belongs to the field of communications, and in particular, to a method, system and device for transmitting and receiving network data.

Background technique

With the development of network technology, the transmission of network data is increasing. In some cases, such as real-time playback of IPTV, network latency needs to be low during data transmission. In this case, network data is often transmitted using some data transmission protocols with low network latency, such as the User Datagram Protocol (UDP). Although the data is transmitted using the UDP protocol, the network overhead is small and the network delay is low, but the reliability of data transmission is not guaranteed. At present, when the UDP transmission protocol is used to transmit network data, the data packet to be transmitted by the network data transmitting end is generally directly transmitted to the network data receiving end. In the transmission process of network data, especially when the network signal is not good, the transmission method using such network data is prone to serious packet loss.

Summary of the invention

The embodiment of the invention provides a method for transmitting network data, which can solve the problem that the data packet is easily lost when the network data is transmitted by using the UDP protocol.

The technical solution provided by the embodiment of the present invention is as follows:

An embodiment of the present invention provides a network data sending method, where the sending method includes the following steps: splitting an original data packet larger than a set byte into multiple small data packets;

Identifying the small data packet;

A small packet after sending the identity.

Further, the foregoing method may further include the following steps:

When receiving the retransmission request, the corresponding small data packet is resent according to the identifier of the small data packet carried in the retransmission request.

An embodiment of the present invention provides a network data receiving method, where the receiving method includes the following steps: receiving a small data packet, and checking whether there is a lost small data packet; Sending a retransmission request to the network data sending end when there is a lost small data packet, where the retransmission request carries the identifier of the lost small data packet;

The received small packets are combined into the original data packet.

The embodiment of the present invention provides a network data sending system, where the sending system includes: a splitting unit, configured to split an original data packet larger than a set byte into a plurality of small data packets; Small data package;

The sending unit is configured to send the identified small data packet.

Further, the foregoing sending system may further include: a retransmission request receiving unit, configured to: when the retransmission request is received, trigger the sending module to resend the corresponding small data according to the identifier of the small data packet carried in the retransmission request package.

An embodiment of the present invention provides a network data receiving system, where the receiving system includes: a receiving check unit, configured to receive a small data packet, and check whether there is a lost small data packet; and a retransmission request sending unit, when there is a lost Sending a retransmission request to the network data sender, where the retransmission request carries the identifier of the lost small data packet;

The combination unit combines the received small data packets into original data packets.

An embodiment of the present invention provides a network data sending device, where the network data sending device includes a network data sending system, where the sending system includes:

a splitting unit, configured to split an original data packet larger than a set byte into a plurality of small data packets; and an identifying unit, configured to identify the small data packet;

a sending unit, configured to send the identified small data packet;

The retransmission request receiving unit, when receiving the retransmission request, triggers the sending module to resend the corresponding small data packet according to the identifier of the small data packet carried in the retransmission request.

The embodiment of the present invention provides a network data receiving device, where the network data receiving device includes a network data receiving system, and the receiving system includes:

a receiving check unit, configured to receive a small data packet, and check whether there is a lost small data packet; and a retransmission request sending unit, configured to send a retransmission request to the network data sending end when there is a lost small data packet, where Sending a request carrying the identifier of the lost small data packet;

In an embodiment of the invention, the transmission is reduced by splitting the original data packet into a number of small data packets. The data packet in the transmission process is lost. When the network data receiving end detects that the small data packet is lost, the retransmission request is sent, and the lost data packet is resent by the network data transmitting end, thereby reducing the data when transmitting the network data. The loss of the package.

DRAWINGS

1 is a flowchart of implementing a network data sending method according to an embodiment of the present invention;

2 is a flowchart of implementing a network data receiving method according to an embodiment of the present invention;

3 is a flowchart of an implementation of grouping small data packets in a data window according to an embodiment of the present invention;

4 is a schematic structural diagram of a network data sending system according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a network data receiving system according to an embodiment of the present invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the embodiment of the present invention, packet loss during transmission is reduced by splitting the original data packet into several small data packets, and when the network data receiving end detects that a small data packet is lost, a retransmission request is sent. The lost small packets are resent by the network data sender, thereby reducing the loss of data packets when transmitting network data. Next:

In step S101, the original data packet of the set byte is split into a plurality of small data packets.

The size of the data packets that the network data sender needs to send is inconsistent. There are more than ten KBits, some are less than 1 KBit, and when transmitting network data, larger packets are transmitted compared to smaller packets. It is easier to lose in the process. Therefore, for larger packets, it can be split into several small packets to reduce the loss of packets during transmission, but not for smaller packets. After the splitting is completed, the small data packets after the splitting and the unsplit small data packets can be stored in the cache queue.

The packet split control information is generated while splitting each packet. The control information includes: split number information, that is, the number of split small data packets, that is, the split packets are split into a total The number of small packets; the number of small packets, that is, the serial number of each small packet in the split package, and other information. The packet split control information is added to each small packet as part of the header of the small packet. After the split is complete, the small packets are placed in the buffer queue of the buffer.

As an embodiment of the present invention, the method for splitting a data packet may be: splitting a data packet whose size exceeds m KBit into several small packets of m KBit and a small data packet of not more than m KBit, where m value It can be set as needed. Packets that do not exceed m KBit are not split. For example, a packet with a size of 1 KBit is relatively easy to lose when transmitted over the network, so a packet larger than 1 KBit can be split into several small packets of 1 KBit and a small packet of no more than 1 KBit.

In step S102, a small data packet is identified.

As an embodiment of the present invention, P numbered data windows are configured, each data window has a certain receiving space, the receiving space has N positions, each position can accommodate 1 small data packet, and N positions are There are numbers, where P, N can be set as needed, but P, N should be an integer greater than 1. When the network data has not been sent yet, the P data windows are empty, the small data packets are taken out from the cache queue, and the small data packages are loaded into the P data windows.

When loading a small data packet by using the data window, the small data packet is identified by the number of the data window in which the small data packet is located and the location number of the small data packet in the data window, and the identifier of the small data packet can be saved. In d, the packet header.

In step S103, it is determined whether the network is writable: if the network is writable, step S104 is performed; if the network is not writable, step S105 is performed.

In step S104, the identified small data packet is transmitted.

When the network data sending end sends a new small data packet, each small data packet in one data window is sent as one sending unit each time, that is, when all the small data packets in one data window have been sent. , the small packet in the next data window is sent.

In step S105, it is determined whether the network is readable: if the network is readable, step S106 is performed; if the network is not writable, the sending process is ended.

In step S106, it is determined whether a retransmission request is received: when a retransmission request is received, step S107 is performed; if a retransmission request is not received, the transmission process is ended.

In the process of network transmission, some small data packets may be lost, and the network data receiving end may be to the network. The data sending end sends a retransmission request, and the retransmission request carries an identifier of the small data packet to notify the network data sending end to resend the lost small data packet.

In step S107, a small packet requiring retransmission is found. According to the identifier of the small data packet in the retransmission request, that is, the number of the data window in which the small data packet is located and the location number of the small data packet in the data window, find a small data packet that needs to be retransmitted.

In this way, the transmission of the original data packet is completed, and the original data packet is continuously transmitted in this way until all the original data packets are transmitted.

After a retransmission request for a certain data window is not received within a certain period of time, the data of the data window is considered to have been successfully sent, and the data window can be used to reload the data to update the data of the data window, thereby This data window can be used to send other small data packets.

FIG. 2 is a flowchart showing an implementation process of a network data receiving method according to an embodiment of the present invention. The details are as follows:

In step S201, a small data packet is received.

The network data receiving end has Q data windows, and each data window is the same as the data window of the network data transmitting end. When the network data sending end sends a new small data packet, each small data packet in one data window is sent as one sending unit, and the network data receiving end receives the small data packet accordingly. The small packets arrived are stored in the data window, and each small data packet is stored in the data window of the network data receiving end in the same location as the small data packet stored in the data window of the network data transmitting end. When starting to receive small packets, record the start time of receiving small packets.

In step S202, it is judged whether or not a small data packet is lost.

The data window that completes the receiving process is checked to check whether there is a missing small data packet: If there is no missing small data packet, step S204 is directly executed.

Since the time for receiving a small data packet of a data window normally is within a certain range, a receiving data time period t can be set according to the range, and the time from the start time of receiving the small data packet is obtained, when the receiving time reaches t, It is determined that the small data packet of the completion of the data window is received.

In step S203, a retransmission request carrying the identifier of the small data packet is transmitted. When there is a missing 'J, a data packet, a retransmission request carrying an identifier with a small data packet is sent.

First, generate the identifier of the lost small data packet, that is, the network data of the lost small data packet is sent. The number of the data window at the end, and the location of the missing small packet in the data window. The identity is then loaded into the resend request and the resend request is sent.

The identifier of the data window stored in the small data packet identifier is obtained by extracting a small data packet of the received data window, and the number of the data window in the small data packet identifier is obtained, and the number is the lost small data. The number of the data window where the package is located. Since the data receiving end of the network data is the same as the data window of the network data transmitting end, the position of the missing data window of the network data receiving end is the position of the lost small data packet in the data window of the network data transmitting end.

In step S204, the received small data packets are combined into an original data packet. Make it a separate packet. Using the control information, that is, the number of splits, the number of small packet numbers, etc., the small packets in the data window are combined to be restored to the packets before the split.

In this way, small packets are continuously received, and the split packets are continuously combined until all small packets are received. When the network data receiving end does not receive the small data packet within a certain period of time, it is determined that the small data packet is received.

FIG. 3 shows an implementation flow of grouping small data packets in a data window according to an embodiment of the present invention, which is described in detail as follows:

In step S301, a small data packet is taken from the data window, and the small data packet is inserted into the buffer queue. Each time a small data packet is fetched, and the small data packet is numbered in the data window, the small data packet is inserted into the cache queue, so that the small data packets in the cache queue are arranged in an orderly manner. As an embodiment of the present invention, when d and a data packet are inserted, a binary insertion method with high insertion efficiency can be used.

In step S302, it is determined whether all the small data packets of the data window have been processed. If all the small data packets are processed, the packet processing process of the data window is ended. By detecting if there are still small packets in the cache queue, it is possible to determine whether all the small packets have been processed.

In step S303, the first small data packet of the cache queue is taken out.

In step S304, it is determined whether the small data packet should be currently processed. In the process of processing small packets, an indicator is used to indicate the small packets that should currently be processed. When the small data packet is not a small data packet indicated by the indicator, step S305 is performed, otherwise step S306 is performed.

The indicator records the location number of the small data packet in the data window and indicates the small data packet by the location number of the small data packet.

In step S305, it is determined whether or not to wait for a timeout. When the first small packet is not an indicator When the small data packet indicates that there is no small data packet indicated by the indicator in the buffer queue, the judgment waits for a timeout, that is, whether the difference between the current time and the insertion time of other small data packets of the data window is More than a tolerable period of time, where a tolerable period of time can be set. If the difference between the two is longer than the tolerable period, the small packet is determined to be lost, and step S309 is performed; if the tolerable period is not exceeded, the process returns to step S302, and the small packet indicated by the indicator is put into the buffer. queue.

In step S306, it is determined whether the small data packet is a split packet. When the first small packet is a small packet indicated by the indicator, the first small packet is the small packet currently being processed. According to the control information of the small data packet, it is determined whether the small data packet is an independent data packet or a split packet. If the small data packet is a separate packet, the small data packet is directly taken out from the cache queue and step S308 is performed.

In step S307, the small data packet is grouped. If the small data packet is a split packet, the split packet is taken out from the cache queue, and according to the control information of the small data packet, the remaining split packets are taken out from the cache queue, and the split data packets are separated. Combine, become a separate packet, and get the original split packet. In the remaining split packages, if any split package is lost, the split package and the remaining split packets cannot be combined into separate packets. Therefore, the small data packet and the remaining split packets are discarded.

In step S308, the original data packet is output.

In step S309, the indicator is modified. The indicator is used to indicate the number of the small packet that should be processed currently, which is the location number of the small packet in the data window. If the output is an independent small data packet, the value of the indicator is increased by 1, that is, the next numbered data packet can be processed; if the output is a split package, the small data packet is split according to the split package. The control information is such that the value of the indicator is correspondingly increased.

Of course, the grouping method of the small data packet in the other data window is the same as the grouping method of the small data packet in the data window, and details are not described herein again.

FIG. 4 shows a structure of a network data transmission system according to an embodiment of the present invention. The network data transmission system may be a software unit, a hardware unit, or a combination of software and hardware built in a network data transmission device.

The network data transmitting system includes: a splitting unit 41, an identifying unit 42, and a transmitting unit 43; and may further include a retransmission request receiving unit 44. among them:

The splitting module 41 splits the original data packet larger than the set byte into a plurality of small data packets; The block 42 identifies the small data packet; the sending module 43 sends the identified small data packet; when the retransmission request receiving unit 44 receives the retransmission request, the sending unit is triggered according to the identifier of the small data packet carried in the retransmission request. 43 Resend the corresponding small data packet.

The splitting unit 41 may further include: a packet splitting module 411, a generating module 412, and an adding module 413. Specifically, the process of splitting the original data packet larger than the set byte into multiple small data packets by the splitting unit 41 includes: the data packet splitting module 411 splits the data packet whose size exceeds m KBit into a plurality of m KBit small data packets and a small data packet not larger than m KBit; the generating module 412 generates data packet splitting control information, where the data packet splitting control information includes information about the number of split small data packets and The number of each small data packet, the adding module 413 adds the number information of the split small data packet, and the number of the small data packet to the small data packet corresponding to the number of the small data packet.

The identification unit 42 may further include: a configuration module 421, a small data packet loading module 422, and a small data packet identification module 423. Specifically, the process of identifying the small data packet by the identifier unit 42 is specifically: the configuration module 421 configures a data window for loading the small data packet; the small data package loading module 422 loads the small data package into the data window; And the small data packet identification module 423 identifies the small data packet by using the number of the data window and the location of each small data packet in the data window.

The embodiment of the present invention further provides a network data sending device, where the network data transmitting device includes the network data sending system configured as described above.

FIG. 5 shows a structure of a network data receiving system according to an embodiment of the present invention. The network data receiving system may be a software unit, a hardware unit, or a combination of hardware and software built in a network data receiving device.

The network data receiving system includes: a receiving check unit 51, a retransmission request transmitting unit 52, and a combining unit 53.

The receiving check unit 51 is responsible for receiving the small data packet and checking whether there is a lost small data packet; when there is a lost small data packet, the retransmission request transmitting unit 52 sends a retransmission request to the network data transmitting end, and the retransmission request carries the retransmission request The identifier of the lost small data packet; the combining unit 53 combines the received small data packets into the original data packet.

The combining unit 53 may further include: a small data packet splitting packet determining module. 531. A split packet combination module 532 and a data packet output module 533. Specifically, the process of combining the small data packets into the original data packets by the combining unit 53 is specifically as follows: The split packet determining module 531 determines whether the received small data packet is a split packet, and when the small data packet is split. At the time of the packet, the remaining small data packet is obtained by the split packet combining module 532, and the small data packet is combined with the remaining small data packet to become the original data packet, and the original data packet is output by the data packet output module 533.

The embodiment of the present invention further provides a network data receiving device, where the network data receiving device includes a network data receiving system including the above structure.

A person skilled in the art can understand that all or part of the steps carried by the method of the foregoing embodiment can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium. , including one or a combination of the steps of the method embodiments.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. The integrated modules, if implemented in the form of software functional modules and sold or used as separate products, may also be stored in a computer readable storage medium.

The above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

In summary, the foregoing embodiment of the present invention reduces packet loss during transmission by splitting the original data packet into several small data packets. When the network data receiving end detects that a small data packet is lost, the retransmission is sent. The request, the network data sender resends the lost small data packet, thereby reducing the loss of the data packet when transmitting the network data.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

Rights request

A method for transmitting network data, comprising:

Split the original data packet larger than the set byte into multiple small data packets;

Identifying the small data packet;

d, the data packet after sending the identification.

2. The network data sending method according to claim 1, further comprising: resending the corresponding small data packet according to the identifier of the small data packet carried in the retransmission request when receiving the retransmission request .

The network data transmitting method according to claim 1 or 2, wherein the step of splitting the original data packet larger than the set byte into a plurality of small data packets further comprises:

Split the original data packet larger than m KBit into several small packets of m KBit and a small data packet of not more than m KBit;

Generating packet splitting control information, where the packet splitting control information includes information on the number of split small packets and the number of each small data packet;

The number information of the split small data packet and the number of the small data packet are added to the small data packet corresponding to the number of the small data packet.

The network data sending method according to claim 1 or 2, wherein the step of identifying the small data packet is specifically:

Configure the data window for loading small packets;

Loading the small data package into the data window;

The small data packet is identified by the number of the data window and the location of each small data packet in the data window.

A network data receiving method, comprising:

Receive small packets and check for missing small packets;

And when there is a lost small data packet, sending a retransmission request to the network data sending end, where the retransmission request carries the identifier of the lost small data packet;

The received small packets are combined into the original data packet.

The network data receiving method according to claim 5, wherein the step of combining the received small data packets into the original data packets is specifically: Determine whether the received d and the data packet are split packages;

When the small data packet is a split packet, the remaining small data packet is obtained, and the small data packet is combined with the remaining small data packet to become the original data packet;

The original data packet is output.

7. A network data transmission system, comprising:

The sending unit is configured to send the identified small data packet.

The network data transmission system according to claim 7, further comprising: a retransmission request receiving unit, configured to: according to the identifier of the small data packet carried in the retransmission request, when receiving the retransmission request Triggering the sending module to resend the corresponding small data packet.

The network data transmission system according to claim 7 or 8, wherein the splitting unit further comprises:

a packet splitting module, configured to split a data packet larger than m KBit into a plurality of small packets of m KBit and a small data packet of not more than m KBit;

a generating module, configured to generate data packet splitting control information, where the data packet splitting control information includes information about a number of split small data packets and a number of each small data packet;

And a adding module, configured to add the number information of the split small data packet and the number of the small data packet to the small data packet corresponding to the number of the small data packet.

The network data transmission system according to claim 7 or 8, wherein the identification unit further comprises:

a configuration module, configured to configure a data window for loading small data packets;

a small data package carrying module, configured to load the small data package into the data window; and a small data packet identification module, configured to utilize a number of the data window and a location of each small data packet in the data window Identify small packets.

A network data receiving system, comprising:

a receiving check unit, configured to receive a small data packet, and check whether there is a lost small data packet; and a retransmission request sending unit, configured to send a retransmission request to the network data sending end when there is a lost small data packet, where Sending a request carrying the identifier of the lost small data packet; The combination unit combines the received small data packets into original data packets.

The network data receiving system according to claim 11, wherein the combination unit further comprises:

a split packet determining module, configured to determine whether the received small data packet is a split packet;

a split packet combination module, configured to: when a small data packet is a split packet, acquire the remaining small data packet, and combine the small data packet with the remaining small data packet to become an original data packet;

A packet output module for outputting raw data packets.

A network data transmitting device, wherein the network data transmitting device includes a network data transmitting system, and the sending system includes:

a sending unit, configured to send the identified small data packet;

A network data receiving device, wherein the network data receiving device comprises a network data receiving system, and the receiving system comprises: