WO2017143772A1 - 基于dvb－rcs系统的数据重传方法及装置 - Google Patents

基于dvb－rcs系统的数据重传方法及装置 Download PDF

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Publication number
WO2017143772A1
WO2017143772A1 PCT/CN2016/099531 CN2016099531W WO2017143772A1 WO 2017143772 A1 WO2017143772 A1 WO 2017143772A1 CN 2016099531 W CN2016099531 W CN 2016099531W WO 2017143772 A1 WO2017143772 A1 WO 2017143772A1
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Prior art keywords
data
retransmission
sequence number
message
fragment data
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PCT/CN2016/099531
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English (en)
French (fr)
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王志民
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/188—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04L1/1803—Stop-and-wait protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04L1/1809—Selective-repeat protocols

Definitions

  • the present invention relates to data transmission technologies, and in particular, to a data retransmission method and apparatus based on a Digital Video Broadcasting Return Channel via Satellite (DVB-RCS) system. .
  • DVD-RCS Digital Video Broadcasting Return Channel via Satellite
  • the DVB-RCS system is a data transmission system based on satellite transmission.
  • the system does not provide data retransmission function when defining the data transmission.
  • the retransmission function in the current satellite communication system is generally implemented in the data transmission layer, using the Transmission Control Protocol (TCP) protocol or the Space Communication Protocol Specification-Transport Protocol (SCPS-TP) protocol.
  • TCP Transmission Control Protocol
  • SCPS-TP Space Communication Protocol Specification-Transport Protocol
  • the data transmission layer implements the retransmission function
  • the entire transport layer data packet needs to be retransmitted, since the data is further fragmented in the Media Access Control (MAC) layer.
  • MAC Media Access Control
  • the TCP packet is divided into four MAC packets, which are transmitted in the air interface. There may be only one packet error in the air interface transmission process.
  • the TCP layer performs the check retransmission function, all data must be retransmitted, resulting in air interface bandwidth. waste.
  • embodiments of the present invention are directed to a data retransmission method and apparatus based on a DVB-RCS system, which provide a reliable data transmission scheme for a DVB-RCS system.
  • a data retransmission method based on a DVB-RCS system comprising:
  • the primary station performs fragmentation processing on the media access control MAC layer data
  • the primary station After the primary station sends one of the fragment data, the primary station starts a timer, and sends the sent fragment data to the sent data queue;
  • the primary station After the timer expires, the primary station resends the last fragment data.
  • the method further includes:
  • the primary station receives a NAK message sent by the end station; the NAK message includes a message number, a retransmission sequence number, a location at which the retransmission fragment data starts, and a location at which the retransmission fragment data ends; the NAK message is used for the application.
  • the primary station resends the fragment data corresponding to the retransmission sequence number;
  • the primary station When the primary station determines, according to the NAK message, that the retransmitted sequence number in the NAK message is included in the transmitted data queue, the primary station retransmits the fragmentation data corresponding to the retransmission sequence number.
  • a data retransmission method based on a DVB-RCS system comprising:
  • the end station compares the serial numbers of all the fragmented data received
  • the end station When the sequence number of the fragment data is discontinuous, the end station sends a NAK message to the primary station, where the NAK message includes a message number, a retransmission sequence number, a location at which the retransmission fragment data starts, and a retransmission fragment data. End position; the NAK message is used to apply for the primary station to resend the fragment data corresponding to the retransmission sequence number;
  • the end station receives the fragment data sent by the primary station and corresponding to the retransmission sequence number.
  • a data retransmission method based on a DVB-RCS system comprising:
  • the end station performs fragmentation processing on the media access control MAC layer data
  • the end station sends a timer data to start a timer
  • the fragment data is re-transmitted, where the ACK message includes a message number, an ACK sequence number, and the fragmentation. The location at which the data begins and the location at which the fragmentation data ends.
  • the method further includes:
  • the end station After receiving the ACK message sent by the primary station, the end station turns off the timer corresponding to the fragment data.
  • a data retransmission method based on a DVB-RCS system comprising:
  • the primary station receives the fragmented data sent by the end station
  • the primary station sends an ACK message to the end station, where the ACK message includes a message number, an ACK sequence number, a location at which the fragmentation data begins, and a location at which the fragmentation data ends.
  • a data retransmission device based on a DVB-RCS system comprising:
  • a first processing module configured to perform fragmentation processing on media access control MAC layer data
  • a first sending module configured to start a timer after each of the fragment data is sent, and send the sent fragment data to the sent data queue; after the timer expires, resend the last One of the fragmented data.
  • the device further comprises:
  • a first receiving module configured to receive a NAK message sent by the end station;
  • the NAK message includes a message number, a retransmission sequence number, a location where the retransmission fragment data starts, and a location where the retransmission fragment data ends;
  • the NAK message And configured to apply, by the primary station, to resend the fragment data corresponding to the retransmission sequence number;
  • the first sending module is further configured to resend the fragment data corresponding to the retransmission sequence number when determining, according to the NAK message, that the retransmitted sequence number in the NAK message is included in the sent data queue.
  • a data retransmission device based on a DVB-RCS system comprising:
  • a second processing module configured to compare sequence numbers of all received fragment data
  • a second sending module configured to send a NAK message to the primary station when the sequence number of the fragment data is discontinuous, where the NAK message includes a message number, a retransmission sequence number, a location where the retransmission fragment data starts, and a retransmission a location at which the fragmentation data ends; the NAK message is used to apply for the primary station to resend the fragmentation data corresponding to the retransmission sequence number;
  • the second receiving module is configured to receive the fragment data that is sent by the primary station and that corresponds to the retransmission sequence number.
  • a data retransmission device based on a DVB-RCS system comprising:
  • a third processing module configured to perform fragment processing on media access control MAC layer data
  • a third sending module configured to start a timer after sending the fragment data; if the ACK message sent by the primary station is not received after the timer expires, resending the fragment data, where
  • the ACK message includes a message number, an ACK sequence number, a location at which the slice data starts, and a location at which the slice data ends.
  • the device further comprises:
  • the third receiving module is configured to: after receiving the ACK message sent by the primary station, close the timer corresponding to the fragment data.
  • a data retransmission device based on a DVB-RCS system comprising:
  • a fourth receiving module configured to receive the fragment data sent by the end station
  • a fourth sending module configured to send an ACK message to the end station, where the ACK message includes a message number, an ACK sequence number, a location where the fragmentation data starts, and a location where the fragmentation data ends.
  • Data retransmission method and device based on DVB-RCS system performed by a primary station MAC layer data fragmentation, after sending a data fragment, a timer is started, and after the fragment data is sent, a sent data queue is sent. After the timer expires, the last fragment data is retransmitted; After receiving the data, the sequence number is compared. If the sequence number is not continuous, the NAK message is sent. After receiving the NAK message, the primary station determines whether the sent message queue contains the retransmission sequence number in the NAK message, and if so, retransmits the message sequence. Retransmit the fragment data corresponding to the sequence number.
  • the retransmission check function is implemented at the MAC layer, and the erroneous data can be found earlier by the retransmission check function, and only some of the erroneous MAC layer data can be retransmitted, reducing the retransmission overhead.
  • FIG. 1 is a schematic diagram of a data packet of a transport layer transmitted by a MAC layer in the prior art
  • FIG. 2 is a schematic diagram of an uplink data transmission process in a DVB-RCS system
  • Figure 3 is a schematic diagram of a typical DVB-RCS system
  • FIG. 5 is a flowchart of a data retransmission method based on a DVB-RCS system according to Embodiment 2 of the present invention.
  • FIG. 6 is a flowchart of a data retransmission method based on a DVB-RCS system according to Embodiment 3 of the present invention.
  • FIG. 7 is a flowchart of a data retransmission method based on a DVB-RCS system according to Embodiment 4 of the present invention.
  • FIG. 8 is a schematic structural diagram of a data retransmission apparatus based on a DVB-RCS system according to Embodiment 1 of the present invention.
  • FIG. 9 is a schematic structural diagram of a data retransmission apparatus based on a DVB-RCS system according to Embodiment 2 of the present invention.
  • FIG. 10 is a schematic structural diagram of a data retransmission apparatus based on a DVB-RCS system according to Embodiment 3 of the present invention.
  • FIG. 11 is a schematic structural diagram of a data retransmission apparatus based on a DVB-RCS system according to Embodiment 4 of the present invention.
  • the uplink and downlink transmission mechanisms are asymmetric.
  • the downlink data can be sent after reaching the primary station.
  • the uplink data transmission process is shown in Figure 2.
  • the end station A resource request message (BSR) needs to be sent to the primary station first, and after receiving the message, the primary station allocates an uplink air interface resource for the end station by sending a TBTP message, and the end station can send the uplink data after receiving the TBTP message, thereby It can be seen that the transmission delay of the uplink data and the consumed resources are much larger than the downlink data.
  • BSR resource request message
  • the ACK mechanism is usually used for packet acknowledgment in the existing SCPS-TP.
  • the NAK mechanism is used for packet acknowledgement; specifically, when the downlink data is sent, if the ACK mechanism is used for retransmission check, that is, the ACK message is to be sent on the satellite uplink channel, whether the resource consumption or the delay is very large. Therefore, it is not suitable to use the ACK method for retransmission verification on the downlink channel.
  • the NSK mechanism is used in the uplink data transmission to retransmit the uplink data, in this mechanism, the transmitted data arrives at the end. The end data is generally retransmitted to ensure reliable transmission of the data, even if the data has been received correctly, this retransmission will occur.
  • a NAK data needs to allocate a slot resource.
  • the NAK mechanism will cause many unnecessary data retransmissions, which will waste a lot of uplink channels. Resources.
  • the data retransmission function is implemented in the MAC layer, and for the downlink data, the NAK mechanism is used for retransmission check, and for the uplink data, the ACK mechanism is used for retransmission check;
  • the DVB-RCS system uses the mechanism of uplink and downlink channel asymmetry to minimize the uplink data overhead to implement data retransmission check.
  • the retransmission check function is implemented at the MAC layer, the erroneous data can be seriously weighted earlier.
  • the pass verification function finds that only some of the incorrect MAC layer data can be retransmitted, reducing the retransmission overhead.
  • the user data device is connected to the satellite access device ROUTER, connected to the access device HUB through the satellite transmission channel, and connected to the data network for data transmission; the retransmission function is deployed in the MAC.
  • the layer is implemented on the ROUTER and HUB devices; the uplink sent from the ROUTER to the HUB is retransmitted using the ACK method, and the downlink from the HUB to the ROUTER is retransmitted using the NAK method.
  • the uplink uses the TDMA mechanism for transmission, and 50 slots of data are transmitted every 20 ms, each time slot carrying 26 bytes of data.
  • FIG. 4 is a flowchart of a data retransmission method based on a DVB-RCS system according to Embodiment 1 of the present invention.
  • the sending of downlink data includes the following steps:
  • Step 101 The primary station performs fragmentation processing on the MAC layer data.
  • Step 102 The primary station starts a timer after each piece of the fragment data is sent, and sends the sent fragment data to the sent data queue.
  • Step 103 After the timer expires, the primary station resends the last fragment data.
  • the primary station may further receive a NAK message sent by the end station; the NAK message includes the message number and the weight a sequence number, a location at which the retransmission of the fragment data starts, and a location at which the retransmission fragment data ends; the NAK message is used to apply for the primary station to resend the fragment data corresponding to the retransmission sequence number; When the NAK message determines that the retransmitted sequence number in the NAK message is included in the transmitted data queue, the primary station resends the fragment data corresponding to the retransmission sequence number.
  • FIG. 5 is a flowchart of a data retransmission method based on a DVB-RCS system according to Embodiment 2 of the present invention.
  • receiving downlink data includes the following steps:
  • Step 201 The end station compares the serial numbers of all the fragmented data received
  • Step 202 When the sequence number of the fragment data is discontinuous, the end station sends a NAK message to the primary station, where the NAK message includes a message number, a retransmission sequence number, a location where the retransmission fragment data starts, and a retransmission a location at which the fragmentation data ends; the NAK message is used to apply for the primary station to resend the fragmentation data corresponding to the retransmission sequence number;
  • Step 203 The end station receives fragment data corresponding to the retransmission sequence number sent by the primary station.
  • the data sent by the downlink channel is verified by using the uplink channel.
  • the NAK mechanism is used for retransmission verification; the primary station first performs MAC layer data fragmentation, and sends a data segment.
  • a timer T1 is enabled after the chip, and the duration is 1.5 s. This embodiment does not specifically limit this. If there is new fragment data transmission during the period when the timer T1 is valid, the timer T1 is restarted; After the fragment data is sent, it is sent to a sent data queue. If the timer T1 times out, the last fragment data is resent.
  • the end station After receiving the fragment data, the end station performs sequence number comparison. If the sequence number is not continuous, the NAK message for requesting the fragment data corresponding to the missing sequence number is sent.
  • the message format is shown in Table 1. After the primary station receives the NAK message, Determining whether the sent message queue includes a retransmission sequence number in the NAK message, and if so, resending the fragmentation data corresponding to the retransmission sequence number.
  • each TCP data The packet needs to be verified by using an ACK packet. If 100 TCP packets are sent, 100 ACK packets are required for verification. For an air interface with an error rate of one percent, the NAK method in this embodiment is used for verification. Need to send a NAK package, the uplink overhead is greatly reduced.
  • the satellite air interface delay is 0.5 seconds
  • the maximum rate will be limited by the TCP window. If the data allowed by the TCP window is sent during the air interface delay time, the transmission cannot be continued, and the ACK needs to be waited. The data can be sent further, and the traditional TCP window size is 64KB, which is the upper limit of 64/0.5, which is about 128KB.
  • the retransmission check function is implemented in the MAC layer, and the erroneous data can be found by the retransmission check function earlier, and only some of the erroneous MAC layer data can be retransmitted, thereby reducing the retransmission overhead.
  • FIG. 6 is a flowchart of a data retransmission method based on a DVB-RCS system according to Embodiment 3 of the present invention.
  • the sending of uplink data includes the following steps:
  • Step 301 The end station performs fragmentation processing on the MAC layer data.
  • Step 302 The end station sends a timer data to start a timer.
  • Step 303 After the timer expires, if the end station does not receive the ACK message sent by the primary station, resend the fragment data, where the ACK message includes a message number, an ACK sequence, and a The position at which the slice data starts and the position at which the slice data ends.
  • the end station After receiving the ACK message sent by the primary station, the end station turns off the timer corresponding to the fragment data.
  • FIG. 7 is a flowchart of a data retransmission method based on the DVB-RCS system according to Embodiment 4 of the present invention.
  • the receiving of uplink data includes the following steps:
  • Step 401 The primary station receives the fragment data sent by the end station.
  • Step 402 The primary station sends an ACK message to the end station, where the ACK message includes a message number, an ACK sequence number, a location where the fragmentation data starts, and a location where the fragmentation data ends.
  • the data transmitted by the uplink channel is verified by using the downlink channel.
  • the uplink data is retransmitted and verified using the ACK mechanism.
  • the end station first performs MAC layer data fragmentation, and after each data fragment is sent, a timer T1 is enabled, and the duration is 1.5 s. This embodiment does not specifically limit this.
  • each fragment data After receiving the fragment data, the primary station sends an ACK message on the downlink channel.
  • the format of the message is shown in Table 2.
  • the end station After receiving the ACK message, the end station closes the corresponding timer. If the timer expires, the corresponding fragment data is retransmitted. In use, each fragment data can be set to be transmitted at most three times, which is not specifically limited in this embodiment.
  • the downlink data is used in the implementation to complete the retransmission check of the uplink data.
  • the error rate of the wireless air interface is one percent
  • one reverse slot transmits 26 bytes
  • one reverse packet has an average length of 200 bytes
  • an average of eight slots can transmit one reverse packet
  • 100 slots have An error may occur, that is, an error occurs when about 2600 bytes are transmitted.
  • the 200-byte packet needs to be retransmitted when an error occurs, and the retransmission overhead is increased to about eight percent. If you can only retransmit an error slot data, the retransmission overhead is still only one percent.
  • the retransmission check function is implemented in the MAC layer, and the erroneous data can be found by the retransmission check function earlier, and only some of the erroneous MAC layer data can be retransmitted, thereby reducing the retransmission overhead.
  • FIG. 8 is a schematic structural diagram of a data retransmission apparatus based on a DVB-RCS system according to Embodiment 1 of the present invention.
  • the apparatus provided in this embodiment includes: a first processing module 11 and a first sending module 12.
  • the first processing module 11 is configured to perform fragment processing on the MAC layer data.
  • the first sending module 12 is configured to start a timer after each of the fragment data is sent, and send the sent fragment data to the sent data queue; after the timer expires, retransmit The last piece of fragmentation data.
  • the device further includes: a first receiving module 13 configured to receive a NAK message sent by the end station; the NAK message includes a message number, a retransmission sequence number, a location at which the retransmission fragment data starts, and a retransmission point a location at which the slice data ends; the NAK message is used to request the primary station to resend the fragment data corresponding to the retransmission sequence number; the first sending module 12 is further configured to: determine that the sent message is sent according to the NAK message When the data queue includes the retransmission sequence number in the NAK message, the fragment data corresponding to the retransmission sequence number is retransmitted.
  • a first receiving module 13 configured to receive a NAK message sent by the end station; the NAK message includes a message number, a retransmission sequence number, a location at which the retransmission fragment data starts, and a retransmission point a location at which the slice data ends; the NAK message is used to request the primary station to res
  • the data retransmission device based on the DVB-RCS system provided in this embodiment may be used to implement the technical solution of the foregoing method embodiment, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the first processing module 11, the first sending module 12, and the first receiving module 13 may be It is implemented by a central processing unit (CPU), a microprocessor (MPU), a digital signal processor (DSP) or a field programmable gate array (FPGA) on a data retransmission device based on a DVB-RCS system.
  • CPU central processing unit
  • MPU microprocessor
  • DSP digital signal processor
  • FPGA field programmable gate array
  • FIG. 9 is a schematic structural diagram of a data retransmission apparatus based on a DVB-RCS system according to Embodiment 2 of the present invention.
  • the apparatus provided in this embodiment includes: a second processing module 21, a second sending module 22, and The second receiving module 23.
  • a second processing module 21 configured to compare sequence numbers of all received fragment data
  • the second sending module 22 is configured to send a NAK message to the primary station when the sequence number of the fragment data is discontinuous, where the NAK message includes a message number, a retransmission sequence number, a location and a weight at which the retransmission fragment data starts. Transmitting a location where the fragmentation data ends; the NAK message is used to apply for the primary station to resend the fragmentation data corresponding to the retransmission sequence number;
  • the second receiving module 23 is configured to receive the fragment data that is sent by the primary station and that corresponds to the retransmission sequence number.
  • the data retransmission device based on the DVB-RCS system provided in this embodiment may be used to implement the technical solution of the foregoing method embodiment, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the second processing module 21, the second sending module 22, and the second receiving module 23 may be implemented by a device such as a CPU, an MPU, a DSP, or an FPGA located on a data retransmission device based on the DVB-RCS system.
  • FIG. 10 is a schematic structural diagram of a data retransmission apparatus based on a DVB-RCS system according to Embodiment 3 of the present invention.
  • the apparatus provided in this embodiment includes: a third processing module 31 and a third sending module 32.
  • the third processing module 31 is configured to perform fragment processing on the MAC layer data.
  • the third sending module 32 is configured to start a timer after sending the fragment data, and if the ACK message sent by the primary station is not received after the timer expires, resending the fragment data, where
  • the ACK message includes a message number, an ACK sequence number, a location at which the slice data starts, and a location at which the slice data ends.
  • the device further includes: a third receiving module 33, configured to: after receiving the ACK message sent by the primary station, turn off a timer corresponding to the fragment data.
  • the data retransmission device based on the DVB-RCS system provided in this embodiment may be used to implement the technical solution of the foregoing method embodiment, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the third processing module 31, the third sending module 32, and the third receiving module 33 may be implemented by a device such as a CPU, an MPU, a DSP, or an FPGA located on a data retransmission device based on the DVB-RCS system.
  • FIG. 11 is a schematic structural diagram of a data retransmission apparatus based on a DVB-RCS system according to Embodiment 4 of the present invention. As shown in FIG. 11 , the apparatus provided in this embodiment includes: a fourth receiving module 41 and a fourth sending module 42.
  • the fourth receiving module 41 is configured to receive the fragment data sent by the end station
  • the fourth sending module 42 is configured to send an ACK message to the end station, where the ACK message includes a message number, an ACK sequence number, a location where the fragmentation data starts, and a location where the fragmentation data ends.
  • the data retransmission device based on the DVB-RCS system provided in this embodiment may be used to implement the technical solution of the foregoing method embodiment, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the fourth receiving module 41 and the fourth transmitting module 42 may be implemented by a device such as a CPU, an MPU, a DSP, or an FPGA located on a data retransmission device based on the DVB-RCS system.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
  • the method and apparatus of the present application can be applied to a DVB-RCS system.
  • the retransmission check function is implemented at the MAC layer, the erroneous data can be found earlier by the retransmission check function, and only some of the erroneous MAC layer data can be retransmitted, reducing the retransmission overhead.

Abstract

本发明实施例提供一种基于DVB－RCS系统的数据重传方法，该方法包括：主站对媒体接入控制MAC层数据进行分片处理；所述主站每发送完一个所述分片数据后启动一个定时器，并将已发送的所述分片数据送入已发送数据队列；所述主站在所述定时器超时后，重发最后一个所述分片数据。本发明实施例同时还提供一种基于DVB－RCS系统的数据重传装置。

Description

基于DVB－RCS系统的数据重传方法及装置
本申请基于申请号为CN 201610102075.X、申请日为2016年2月25日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明涉及数据传输技术，尤其涉及一种基于数字视频广播-卫星传输信道(Digital Video Broadcasting Return Channel via Satellite，DVB－RCS)系统的数据重传方法及装置。。
背景技术
DVB－RCS系统是基于卫星传输的数据通讯系统，在传统的DVB－RCS系统中，由于卫星传输信道的时延很大，系统在定义实现数据传输时，没有提供数据重传功能。
当前的卫星通讯系统里的重传功能一般在数据传输层实现，使用传输控制协议(Transfer Control Protocol，TCP)协议或者空间通讯协议-传输协议(Space Communication Protocol Specification-Transport Protocol，SCPS-TP)协议来提供数据传输的可靠保障。
但是，在数据传输层实现重传功能的方案中，在数据发送重传时，需要重传整个传输层数据包，由于数据在媒体访问控制(Media Access Control，MAC)层会进一步做分片处理，当卫星空口数据发生错误时，可能发生错误的只是少数MAC层的分片数据，而传输层需要重传的包长比MAC层发生错误的数据包大得多，如图1所示，一个TCP数据包分为四个MAC数据包在空口传递，也许在空口传递过程中只有一个数据包发生错误，但在TCP层执行校验重传功能就必须所有数据都进行重传，造成空口带宽的浪费。
发明内容
有鉴于此，本发明实施例期望提供一种基于DVB－RCS系统的数据重传方法及装置，为DVB-RCS系统提供可靠的数据传输方案。
本发明实施例的技术方案是这样实现的：
一种基于DVB－RCS系统的数据重传方法，所述方法包括：
主站对媒体接入控制MAC层数据进行分片处理；
所述主站每发送完一个所述分片数据后启动一个定时器，并将已发送的所述分片数据送入已发送数据队列；
所述主站在所述定时器超时后，重发最后一个所述分片数据。
如上所述的方法，其中，所述主站在所述定时器超时后，重发最后一个所述分片数据之后，所述方法还包括：
所述主站接收端站发送的NAK消息；所述NAK消息中包含消息号、重传序号、重传分片数据开始的位置和重传分片数据结束的位置；所述NAK消息用于申请所述主站重新发送与重传序号对应的分片数据；
在所述主站根据所述NAK消息判断出已发送数据队列中包含所述NAK消息中的重传序号时，所述主站重发与所述重传序号对应的分片数据。
一种基于DVB-RCS系统的数据重传方法，所述方法包括：
端站将接收到的所有分片数据的序号进行对比；
在所述分片数据的序号不连续时，所述端站向主站发送NAK消息，所述NAK消息中包含消息号、重传序号、重传分片数据开始的位置和重传分片数据结束的位置；所述NAK消息用于申请所述主站重新发送与重传序号对应的分片数据；
所述端站接收所述主站发送的、与所述重传序号对应的分片数据。
一种基于DVB-RCS系统的数据重传方法，所述方法包括：
端站对媒体接入控制MAC层数据进行分片处理；
所述端站发送一个所述分片数据后启动定时器；
在所述定时器超时后，若所述端站未接收到主站发送的ACK消息，则重新发送所述分片数据，其中，所述ACK消息中包含消息号、ACK序号、所述分片数据开始的位置以及所述分片数据结束的位置。
如上所述的方法，其中，所述端站发送一个所述分片数据后启动定时器之后，所述方法还包括：
所述端站接收到主站发送的ACK消息后，关闭与所述分片数据对应的定时器。
一种基于DVB-RCS系统的数据重传方法，所述方法包括：
主站接收端站发送的分片数据；
所述主站向所述端站发送ACK消息，所述ACK消息中包含消息号、ACK序号、所述分片数据开始的位置以及所述分片数据结束的位置。
一种基于DVB－RCS系统的数据重传装置，所述装置包括：
第一处理模块，用于对媒体接入控制MAC层数据进行分片处理；
第一发送模块，用于每发送完一个所述分片数据后启动一个定时器，并将已发送的所述分片数据送入已发送数据队列；在所述定时器超时后，重发最后一个所述分片数据。
如上所述的装置，其中，所述装置还包括：
第一接收模块，用于接收端站发送的NAK消息；所述NAK消息中包含消息号、重传序号、重传分片数据开始的位置和重传分片数据结束的位置；所述NAK消息用于申请所述主站重新发送与重传序号对应的分片数据；
所述第一发送模块还用于：在根据所述NAK消息判断出已发送数据队列中包含所述NAK消息中的重传序号时，重发与所述重传序号对应的分片数据。
一种基于DVB-RCS系统的数据重传装置，所述装置包括：
第二处理模块，用于将接收到的所有分片数据的序号进行对比；
第二发送模块，用于在所述分片数据的序号不连续时，向主站发送NAK消息，所述NAK消息中包含消息号、重传序号、重传分片数据开始的位置和重传分片数据结束的位置；所述NAK消息用于申请所述主站重新发送与重传序号对应的分片数据；
第二接收模块，用于接收所述主站发送的、与所述重传序号对应的分片数据。
一种基于DVB-RCS系统的数据重传装置，所述装置包括：
第三处理模块，用于对媒体接入控制MAC层数据进行分片处理；
第三发送模块，用于发送一个所述分片数据后启动定时器；在所述定时器超时后，若未接收到主站发送的ACK消息，则重新发送所述分片数据，其中，所述ACK消息中包含消息号、ACK序号、所述分片数据开始的位置以及所述分片数据结束的位置。
如上所述的装置，其中，所述装置还包括：
第三接收模块，用于接收到主站发送的ACK消息后，关闭与所述分片数据对应的定时器。
一种基于DVB-RCS系统的数据重传装置，所述装置包括：
第四接收模块，用于接收端站发送的分片数据；
第四发送模块，用于向所述端站发送ACK消息，所述ACK消息中包含消息号、ACK序号、所述分片数据开始的位置以及所述分片数据结束的位置。
本发明实施例提供的基于DVB－RCS系统的数据重传方法及装置，主站进行 MAC层数据分片，发送完一个数据分片后开启一个定时器，并在分片数据发送完毕后送入一个已发送数据队列，定时器超时后，则重发最后一个分片数据；端站接收到数据后进行序号对比，如果序号不连续，则发送NAK消息，主站收到NAK消息后，则判断已发送消息队列是否包含NAK消息中的重传序号，如果包含，则重发与该重传序号对应的分片数据。如此，重传校验功能在MAC层实现，错误数据能够更早的被重传校验功能发现，并且可以只重传部分错误的MAC层数据，减少了重传开销。
附图说明
图1为现有技术中传输层的数据包通过MAC层分片发送的示意图；
图2为DVB-RCS系统中上行数据发送流程的示意图；
图3为典型的DVB-RCS系统的示意图；
图4为本发明实施例一提供的基于DVB-RCS系统的数据重传方法的流程图；
图5为本发明实施例二提供的基于DVB-RCS系统的数据重传方法的流程图；
图6为本发明实施例三提供的基于DVB-RCS系统的数据重传方法的流程图；
图7为本发明实施例四提供的基于DVB-RCS系统的数据重传方法的流程图；
图8为本发明实施例一提供的基于DVB－RCS系统的数据重传装置的结构示意图；
图9为本发明实施例二提供的基于DVB－RCS系统的数据重传装置的结构示意图；
图10为本发明实施例三提供的基于DVB－RCS系统的数据重传装置的结构示意图；
图11为本发明实施例四提供的基于DVB－RCS系统的数据重传装置的结构示意图。
具体实施方式
在DVB-RCS系统中，上行和下行的发送机制是不对称的，下行数据是到达主站后即可被下发，上行数据发送流程如图2所示，上行数据到达端站后，端站需要先向主站发送一个资源请求消息(BSR)，主站收到消息后，再通过发送TBTP消息为端站分配上行空口资源，端站收到该TBTP消息后才能发出上行数据，由此可以看出，上行数据的发送时延和消耗的资源比下行数据大很多。
而在现有的TCP协议中，通常使用ACK机制进行数据包确认，在现有的SCPS-TP 协议中，使用NAK机制进行数据包确认；具体的，在发送下行数据时，如果使用ACK机制进行重传校验，即ACK消息要在卫星上行信道发送，无论是资源消耗还是时延都非常大，因此实际上在下行信道上使用ACK方法进行重传校验并不适合；如果在上行数据传输里使用NAK机制对上行数据进行重传校验，在该种机制中，发送的数据到了结尾时，一般会重发结尾数据来保证数据的可靠发送，即使数据已经被正确接收，这种重发也会发生。
由于DVB-RCS系统中上行信道的时延较大，而且上行使用TDMA体制，一个NAK数据再小也需要分配一个slot资源，采用NAK机制会造成许多不必要的数据重发，会浪费大量上行信道资源。
由此，在本发明的各实施例中，使数据重传功能在MAC层实现，并且，对于下行数据，采用NAK机制进行重传校验，对于上行数据，采用ACK机制进行重传校验；利用了DVB-RCS系统上下行信道不对称的机制，尽量减少上行数据开销来实现数据重传校验，另外，由于重传校验功能在MAC层实现，因此，错误数据能够更早的被重传校验功能发现，并且可以只重传部分错误的MAC层数据，减少了重传开销。
下面结合附图和具体的实施方式对本发明的技术方案进行详细描述。
如图3所示，在典型的DVB-RCS系统中，用户数据设备连接卫星接入设备ROUTER，通过卫星传输信道连接接入设备HUB，与数据网相连，进行数据传输；重传功能部署在MAC层，在ROUTER及HUB设备上实现；数据从ROUTER发送到HUB的上行链路使用ACK方法进行重传校验，数据从HUB发送到ROUTER的下行链路使用NAK方法进行重传校验。
假设这个系统的带宽为2M，卫星传输系统时延为0.5秒，上行使用TDMA机制进行传输，每20ms传输50个时隙数据，每个时隙承载26字节数据。
具体的，图4为本发明实施例一提供的基于DVB-RCS系统的数据重传方法的流程图，如图4所示，对于下行数据的发送包括如下步骤：
步骤101、主站对MAC层数据进行分片处理；
步骤102、所述主站每发送完一个所述分片数据后启动一个定时器，并将已发送的所述分片数据送入已发送数据队列；
步骤103、所述主站在所述定时器超时后，重发最后一个所述分片数据。
进一步地，如果端站接收到的数据不完整，有某个分片数据缺失，在步骤103之后，所述主站还可以接收端站发送的NAK消息；所述NAK消息中包含消息号、重 传序号、重传分片数据开始的位置和重传分片数据结束的位置；所述NAK消息用于申请所述主站重新发送与重传序号对应的分片数据；所述主站在根据所述NAK消息判断出已发送数据队列中包含所述NAK消息中的重传序号时，所述主站重发与所述重传序号对应的分片数据。
具体的，图5为本发明实施例二提供的基于DVB-RCS系统的数据重传方法的流程图，如图5所示，对于下行数据的接收包括如下步骤：
步骤201、端站将接收到的所有分片数据的序号进行对比；
步骤202、在所述分片数据的序号不连续时，所述端站向主站发送NAK消息，所述NAK消息中包含消息号、重传序号、重传分片数据开始的位置和重传分片数据结束的位置；所述NAK消息用于申请所述主站重新发送与重传序号对应的分片数据；
步骤203、所述端站接收所述主站发送的、与所述重传序号对应的分片数据。
在下行数据的发送和接收过程中，下行信道发送的数据使用上行信道进行证实，为了减少上行开销，使用NAK机制进行重传校验；主站先进行MAC层数据分片，发送完一个数据分片后开启一个定时器T1，可以将时长时长为1.5s，本实施例对此不进行具体限定，如果在定时器T1有效期间有新的分片数据发送，则重新启动定时器T1；并在分片数据发送完毕后送入一个已发送数据队列，如果定时器T1超时，则重发最后一个分片数据。
而端站接收到分片数据后进行序号对比，如果序号不连续，则发送用于申请与缺失序号对应的分片数据的NAK消息，消息格式见表一，主站收到NAK消息后，则判断已发送消息队列是否包含NAK消息中的重传序号，如果包含，则重发与该重传序号对应的分片数据。
表一
域 长度(bit) 说明
msgid 8 消息号
NakSeq 8 重传序号
SOStart 16 重传数据分片开始的位置
SOEnd 16 重传数据分片结束的位置
与下行使用TCP机制进行重传校验的方案对比，在TCP机制中，每个TCP数据 包都需要使用一个ACK包进行验证，如果发送了100个TCP包，就需要100个ACK包进行验证；对于错误率为百分之一的空口，使用本实施例中的NAK方法进行验证，只需要发送一个NAK包，上行开销大大减少。
另外由于卫星空口时延为0.5秒，即使采用TCP机制进行传输，最大速率会受到TCP窗口的限制，在空口时延时间内如果发送完了TCP窗口允许发送的数据，就不能继续发送，需要等待ACK数据才能进一步发送，而传统的TCP窗口大小为64KB，即速率上限为64/0.5，约为128KB。
本实施例提供的方法，重传校验功能在MAC层实现，错误数据能够更早的被重传校验功能发现，并且可以只重传部分错误的MAC层数据，减少了重传开销。
具体的，图6为本发明实施例三提供的基于DVB-RCS系统的数据重传方法的流程图，如图6所示，对于上行数据的发送包括如下步骤：
步骤301、端站对MAC层数据进行分片处理；
步骤302、所述端站发送一个所述分片数据后启动定时器；
步骤303、在所述定时器超时后，若所述端站未接收到主站发送的ACK消息，则重新发送所述分片数据，其中，所述ACK消息中包含消息号、ACK序号、所述分片数据开始的位置以及所述分片数据结束的位置。
进一步地，所述端站接收到主站发送的ACK消息后，关闭与所述分片数据对应的定时器。
具体的，图7为本发明实施例四提供的基于DVB-RCS系统的数据重传方法的流程图，如图7所示，对于上行数据的接收包括如下步骤：
步骤401、主站接收端站发送的分片数据；
步骤402、所述主站向所述端站发送ACK消息，所述ACK消息中包含消息号、ACK序号、所述分片数据开始的位置以及所述分片数据结束的位置。
在上行数据的发送和接收过程中，上行信道发送的数据使用下行信道进行证实，为了减少上行数据的等待重发，上行数据使用ACK机制进行重传校验。端站先进行MAC层数据分片，每发送完一个数据分片后开启一个定时器T1，可以将时长时长为1.5s，本实施例对此不进行具体限定。
主站收到分片数据后在下行信道发送ACK消息，消息格式见表二，端站收到ACK消息后关闭对应的定时器，如果定时器超时，则重发对应的分片数据，在实际使用中，可以设定每个分片数据最多发送3次，本实施例对此不做具体限定。
表二
域 长度(bit) 说明
msgid 8 消息号
AckSeq 8 Ack序号
SOStart 16 数据分片开始的位置
SOEnd 16 数据分片结束的位置
由于在系统里反向带宽是更稀缺的资源，在实施里尽量使用下行数据来完成上行数据的重传校验。
假设无线空口的错误率是百分之一，一个反向时隙传输26个字节，一个反向包平均长200字节，平均8个时隙可以传输一个反向包，100个时隙有可能出现一个错误，即大约传输2600字节会发生一次错误，如果使用传输层重传纠错方式，在发生错误时需要重传200字节的包，重传开销会提高到大约百分之八，如果能只重传一个错误时隙数据，重传开销就仍然只是百分之一。
本实施例提供的方法，重传校验功能在MAC层实现，错误数据能够更早的被重传校验功能发现，并且可以只重传部分错误的MAC层数据，减少了重传开销。
图8为本发明实施例一提供的基于DVB－RCS系统的数据重传装置的结构示意图，如图8所示，本实施例提供的装置包括：第一处理模块11和第一发送模块12。
其中，第一处理模块11，用于对MAC层数据进行分片处理；
第一发送模块12，用于每发送完一个所述分片数据后启动一个定时器，并将已发送的所述分片数据送入已发送数据队列；在所述定时器超时后，重发最后一个所述分片数据。
进一步地，所述装置还包括：第一接收模块13，用于接收端站发送的NAK消息；所述NAK消息中包含消息号、重传序号、重传分片数据开始的位置和重传分片数据结束的位置；所述NAK消息用于申请所述主站重新发送与重传序号对应的分片数据；所述第一发送模块12还用于：在根据所述NAK消息判断出已发送数据队列中包含所述NAK消息中的重传序号时，重发与所述重传序号对应的分片数据。
本实施例提供的基于DVB-RCS系统的数据重传装置，可用于执行上述方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
在实际应用中，该第一处理模块11、第一发送模块12和第一接收模块13可由 位于基于DVB-RCS系统的数据重传装置上的中央处理器(CPU)、微处理器(MPU)、数字信号处理器(DSP)或现场可编程门阵列(FPGA)等器件实现。
图9为本发明实施例二提供的基于DVB－RCS系统的数据重传装置的结构示意图，如图9所示，本实施例提供的装置包括：第二处理模块21，第二发送模块22以及第二接收模块23。
第二处理模块21，用于将接收到的所有分片数据的序号进行对比；
第二发送模块22，用于在所述分片数据的序号不连续时，向主站发送NAK消息，所述NAK消息中包含消息号、重传序号、重传分片数据开始的位置和重传分片数据结束的位置；所述NAK消息用于申请所述主站重新发送与重传序号对应的分片数据；
第二接收模块23，用于接收所述主站发送的、与所述重传序号对应的分片数据。
本实施例提供的基于DVB-RCS系统的数据重传装置，可用于执行上述方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
在实际应用中，该第二处理模块21，第二发送模块22以及第二接收模块23可由位于基于DVB-RCS系统的数据重传装置上的CPU、MPU、DSP或FPGA等器件实现。
图10为本发明实施例三提供的基于DVB－RCS系统的数据重传装置的结构示意图，如图10所示，本实施例提供的装置包括：第三处理模块31和第三发送模块32。
其中，第三处理模块31，用于对MAC层数据进行分片处理；
第三发送模块32，用于发送一个所述分片数据后启动定时器；在所述定时器超时后，若未接收到主站发送的ACK消息，则重新发送所述分片数据，其中，所述ACK消息中包含消息号、ACK序号、所述分片数据开始的位置以及所述分片数据结束的位置。
进一步地，所述装置还包括：第三接收模块33，用于接收到主站发送的ACK消息后，关闭与所述分片数据对应的定时器。
本实施例提供的基于DVB-RCS系统的数据重传装置，可用于执行上述方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
在实际应用中，该第三处理模块31、第三发送模块32和第三接收模块33可由位于基于DVB-RCS系统的数据重传装置上的CPU、MPU、DSP或FPGA等器件实现。
图11为本发明实施例四提供的基于DVB－RCS系统的数据重传装置的结构示意 图，如图11所示，本实施例提供的装置包括：第四接收模块41和第四发送模块42。
第四接收模块41，用于接收端站发送的分片数据；
第四发送模块42，用于向所述端站发送ACK消息，所述ACK消息中包含消息号、ACK序号、所述分片数据开始的位置以及所述分片数据结束的位置。
本实施例提供的基于DVB-RCS系统的数据重传装置，可用于执行上述方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
在实际应用中，该第四接收模块41和第四发送模块42可由位于基于DVB-RCS系统的数据重传装置上的CPU、MPU、DSP或FPGA等器件实现。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用硬件实施例、软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。
工业实用性
本申请的方法和装置可应用于DVB－RCS系统中。在本申请的实施例中，重传校验功能在MAC层实现，错误数据能够更早的被重传校验功能发现，并且可以只重传部分错误的MAC层数据，减少了重传开销。

Claims (12)

  1. 一种基于数字视频广播-卫星传输信道DVB－RCS系统的数据重传方法，其中，所述方法包括：
    主站对媒体接入控制MAC层数据进行分片处理；
    所述主站每发送完一个所述分片数据后启动一个定时器，并将已发送的所述分片数据送入已发送数据队列；
    所述主站在所述定时器超时后，重发最后一个所述分片数据。
  2. 根据权利要求1所述的方法，其中，所述主站在所述定时器超时后，重发最后一个所述分片数据之后，所述方法还包括：
    所述主站接收端站发送的NAK消息；所述NAK消息中包含消息号、重传序号、重传分片数据开始的位置和重传分片数据结束的位置；所述NAK消息用于申请所述主站重新发送与重传序号对应的分片数据；
    在所述主站根据所述NAK消息判断出已发送数据队列中包含所述NAK消息中的重传序号时，所述主站重发与所述重传序号对应的分片数据。
  3. 一种基于数字视频广播-卫星传输信道DVB-RCS系统的数据重传方法，其中，所述方法包括：
    端站将接收到的所有分片数据的序号进行对比；
    在所述分片数据的序号不连续时，所述端站向主站发送NAK消息，所述NAK消息中包含消息号、重传序号、重传分片数据开始的位置和重传分片数据结束的位置；所述NAK消息用于申请所述主站重新发送与重传序号对应的分片数据；
    所述端站接收所述主站发送的、与所述重传序号对应的分片数据。
  4. 一种基于数字视频广播-卫星传输信道DVB-RCS系统的数据重传方法，其中，所述方法包括：
    端站对媒体接入控制MAC层数据进行分片处理；
    所述端站发送一个所述分片数据后启动定时器；
    在所述定时器超时后，若所述端站未接收到主站发送的ACK消息，则重新发送所述分片数据，其中，所述ACK消息中包含消息号、ACK序号、所述分片数据开始的位置以及所述分片数据结束的位置。
  5. 根据权利要求4所述的方法，其中，所述端站发送一个所述分片数据后启动定时器之后，所述方法还包括：
    所述端站接收到主站发送的ACK消息后，关闭与所述分片数据对应的定时器。
  6. 一种基于数字视频广播-卫星传输信道DVB-RCS系统的数据重传方法，其中，所述方法包括：
    主站接收端站发送的分片数据；
    所述主站向所述端站发送ACK消息，所述ACK消息中包含消息号、ACK序号、所述分片数据开始的位置以及所述分片数据结束的位置。
  7. 一种基于数字视频广播-卫星传输信道DVB－RCS系统的数据重传装置，其中，所述装置包括：
    第一处理模块，设置为对媒体接入控制MAC层数据进行分片处理；
    第一发送模块，设置为每发送完一个所述分片数据后启动一个定时器，并将已发送的所述分片数据送入已发送数据队列；在所述定时器超时后，重发最后一个所述分片数据。
  8. 根据权利要求7所述的装置，其中，所述装置还包括：
    第一接收模块，设置为接收端站发送的NAK消息；所述NAK消息中包含消息号、重传序号、重传分片数据开始的位置和重传分片数据结束的位置；所述NAK消息用于申请所述主站重新发送与重传序号对应的分片数据；
    所述第一发送模块还设置为：在根据所述NAK消息判断出已发送数据队列中包含所述NAK消息中的重传序号时，重发与所述重传序号对应的分片数据。
  9. 一种基于数字视频广播-卫星传输信道DVB-RCS系统的数据重传装置，其中，所述装置包括：
    第二处理模块，设置为将接收到的所有分片数据的序号进行对比；
    第二发送模块，设置为在所述分片数据的序号不连续时，向主站发送NAK消息，所述NAK消息中包含消息号、重传序号、重传分片数据开始的位置和重传分片数据结束的位置；所述NAK消息用于申请所述主站重新发送与重传序号对应的分片数据；
    第二接收模块，设置为接收所述主站发送的、与所述重传序号对应的分片数据。
  10. 一种基于数字视频广播-卫星传输信道DVB-RCS系统的数据重传装置，其中，所述装置包括：
    第三处理模块，设置为对媒体接入控制MAC层数据进行分片处理；
    第三发送模块，设置为发送一个所述分片数据后启动定时器；在所述定时器超 时后，若未接收到主站发送的ACK消息，则重新发送所述分片数据，其中，所述ACK消息中包含消息号、ACK序号、所述分片数据开始的位置以及所述分片数据结束的位置。
  11. 根据权利要求10所述的装置，其中，所述装置还包括：
    第三接收模块，设置为接收到主站发送的ACK消息后，关闭与所述分片数据对应的定时器。
  12. 一种基于数字视频广播-卫星传输信道DVB-RCS系统的数据重传装置，其中，所述装置包括：
    第四接收模块，设置为接收端站发送的分片数据；
    第四发送模块，设置为向所述端站发送ACK消息，所述ACK消息中包含消息号、ACK序号、所述分片数据开始的位置以及所述分片数据结束的位置。
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