WO2019237341A1 - 一种xDSL系统传输确认消息的方法、装置和系统 - Google Patents

一种xDSL系统传输确认消息的方法、装置和系统 Download PDF

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Publication number
WO2019237341A1
WO2019237341A1 PCT/CN2018/091539 CN2018091539W WO2019237341A1 WO 2019237341 A1 WO2019237341 A1 WO 2019237341A1 CN 2018091539 W CN2018091539 W CN 2018091539W WO 2019237341 A1 WO2019237341 A1 WO 2019237341A1
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Prior art keywords
data transmission
unit
transmission unit
confirmation message
sent
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PCT/CN2018/091539
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English (en)
French (fr)
Inventor
张晓风
王祥
何玉杰
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华为技术有限公司
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Priority to PCT/CN2018/091539 priority Critical patent/WO2019237341A1/zh
Publication of WO2019237341A1 publication Critical patent/WO2019237341A1/zh

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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

Definitions

  • the embodiments of the present application relate to the field of communication technologies, and in particular, to a method, a device, and a system for transmitting an acknowledgement message by an x digital subscriber line (xDSL) system.
  • xDSL x digital subscriber line
  • the fiber-to-the-home (FTTH) technology represented by passive optical network (PON) has been able to meet the increasing expectations of the access network speed in terms of bandwidth, but the There are insurmountable limitations in many aspects such as deployment, operation and maintenance, and stability. In particular, the construction cost of fiber-optic homes is relatively high, and the cost of the entire life cycle is far from the operator's expectations. Copper subscriber line (digital subscriber line, DSL) and other copper access technologies have obvious advantages in terms of investment, operation and maintenance. Operators hope that while protecting and utilizing their existing copper wire investments, they will be able to provide broadband access services that will meet user needs in the next 10 to 20 years or more.
  • DSL digital subscriber line
  • G.fast is a new high-bandwidth access technology on copper. It is defined by the ITU-T G.9701 standard, which was officially released in December 2014. G.fast uses time division duplexing (TDD) for uplink and downlink.
  • TDD time division duplexing
  • uplink and downlink occupy all subcarriers in the entire frequency band to send information, and the system allocates time slots separately.
  • the transceiver at one end of the same time slot can only send or receive, while the opposite end can only take the opposite operation in this time slot.
  • G.mgFast In order to provide users with higher rates, the ITU approved the G.mgfast standard project in June 2017. G.mgFast supports application scenarios with shorter copper distances, and in order to achieve higher speeds, it is proposed that G.mgFast devices can work in full duplex (FDX) mode, that is, uplink and downlink can be sent at the same frequency at the same time.
  • FDX full duplex
  • G.mgFast continues the previous DSL (Digital Subscriber Line) system to support retransmission (RTX) in terms of impulse noise protection.
  • RTX retransmission
  • G.mgFast supports the FDX mode, which can reduce the end-to-end delay by confirming the correctness of the received data transfer unit (DTU) in time, providing better Quality of service (QoS) guarantee.
  • DTU data transfer unit
  • QoS Quality of service
  • DMT discrete multi-tone
  • the DTUs sent at the same time enter the retransmission queue, and the retransmission DTU and the selection of the newly transmitted DTU are selected according to the received ACK (Acknowledgement) message of the DTU.
  • the Robust Management Channel (RMC) provides a confirmation message of the received DTU.
  • the DTU confirmation using the same frame structure of the TDD frame and the RMC symbol needs to wait for the last DTU in the previous ACK window (window) to be received before the previous DTU confirmation can be performed.
  • the retransmission buffer is large, and the maximum number of retransmissions is small, which affects the DTU QoS.
  • embodiments of the present application provide a method, a device, and a system for transmitting an acknowledgement message.
  • the acknowledgement period of the DTU is short, and the QoS of the DTU is improved.
  • an embodiment of the present application provides a method for transmitting an acknowledgement message in an xDSL system.
  • the method includes:
  • determining the range of the received data transmission unit determined by the confirmation message according to the time of the sent data transmission unit on the line specifically includes: transmitting according to the data to be transmitted The end time of the unit on the line is offset with reference to the confirmation window to obtain a received data transmission unit that needs to be confirmed; and a confirmation message is generated according to the received data transmission unit that needs to be confirmed.
  • the reference to the confirmation window offset according to the end time of the data transmission unit to be sent on the line, and the received data transmission unit to be confirmed specifically includes: according to the data transmission unit to be sent The end time on the line is shifted forward by the first end data transfer unit after the confirmation window is shifted by a complete discrete multi-tone modulation symbol; the reference point is confirmed based on the reference point.
  • the N data transmission units that have been received on the previous line use the N data transmission units as data transmission units that need to be confirmed, where N is equal to the number of data transmission units that need to be confirmed in the predefined confirmation message .
  • the reference to the confirmation window offset according to the end time of the data transmission unit to be sent on the line, and the received data transmission unit to be confirmed specifically includes: any one of the completed verifications
  • the sequence identifier of the data transmission unit is set as a reference point; based on the reference point, N data transmission units that have been received on the line before the reference point are queried, and the N data transmission units are used as data to be confirmed. Unit, where N is equal to the number of data transmission units that need to be confirmed in the confirmation message defined in advance.
  • the confirmation message includes a frame header, and the frame header carries information about whether the confirmation message is valid.
  • the confirmation message is inserted into the data transmission unit selected to be sent after being encoded.
  • the confirmation message is inserted into the data transmission unit selected to be transmitted and encoded together with the data transmission unit to be transmitted.
  • the confirmation message further carries cyclic redundancy code check information or forward error correction check information.
  • a method for retransmitting data in an xDSL system includes: receiving a data transmission unit; obtaining a confirmation message from the data transmission unit, and the confirmation message carries whether the sent data transmission unit is Information received correctly.
  • the method further includes: performing deinterleaving, decoding, and descrambling processing on the data conversion unit.
  • an xDSL device including:
  • a first processing unit configured to select a data transmission unit to be sent from a data transmission unit transmission queue and a retransmission queue
  • a second processing unit configured to obtain a range of the received data transmission unit that needs to be confirmed according to the end time of the data transmission unit to be sent on the line, generate the confirmation message, and generate the confirmation message Inserting into the data transmission unit to be sent;
  • the sending unit is configured to send the data transmission unit.
  • the second processing unit is specifically configured to generate the confirmation message, where the confirmation message carries a range in which the end time of the data transmission unit to be sent on the line corresponds to the range of the received data transmission unit And inserting the confirmation message into the data transmission unit to be sent.
  • the second processing unit is specifically configured to shift the confirmation window forward by a complete discrete multi-tone modulation symbol according to the end time of the data transmission unit to be sent on the line.
  • a completed data transmission unit is used as a reference point for confirmation; based on the reference point, N data transmission units that have been received on the line before the reference point are queried, and the N data transmission units are used as data to be confirmed.
  • the second processing unit is specifically configured to: set a sequence identifier of any data transmission unit in the completed verification as a reference point; and before querying the reference point based on the reference point
  • the N data transmission units that have been received on the line use the N data transmission units as data transmission units that need to be confirmed, where N is equal to the number of data transmission units that need to be confirmed in the predefined confirmation message.
  • the confirmation message includes a frame header, and the frame header carries information about whether the confirmation message is valid.
  • the xDSL device further includes a first scrambling unit, a first encoding unit, and a first interleaving unit.
  • the first scrambling unit is configured to select a data transmission unit to be sent in the first processing unit. Performing scrambling processing on the selected data transmission unit to be sent; the first encoding unit is configured to perform encoding processing on the data transmission unit processed by the first scrambling unit; and the first interleaving unit is used for Interleaving processing is performed on the data transmission unit processed by the first encoding unit.
  • the xDSL device further includes a second scrambling unit, a second encoding unit, and a second interleaving unit.
  • the second scrambling unit is configured to perform The data transmission unit performs scrambling processing;
  • the second encoding unit is configured to perform encoding processing on the data transmission unit and the confirmation message processed by the second scrambling unit;
  • the second interleaving unit is configured to perform The data transmission unit processed by the second encoding unit performs interleaving processing.
  • an xDSL device including:
  • the obtaining unit obtains a confirmation message from the data transmission unit, and the confirmation message carries information about whether the sent data transmission unit is received correctly.
  • the xDSL device further includes a descrambling unit, a decoding unit, and a deinterleaving unit.
  • the descrambling unit is configured to perform a data transmission unit received by the receiving unit on the selected to-be-sent
  • the data transmission unit performs descrambling code processing
  • the decoding unit is configured to perform decoding processing on the data transmission unit processed by the descrambling code unit
  • the deinterleaving unit is configured to process the descrambled unit after processing.
  • the data transmission unit performs deinterleaving processing.
  • a device including: a processor, a memory, a bus, and a communication interface; the memory is used to store a computer to execute instructions; the processor is connected to the memory through the bus; and when the device is running, the processing The processor executes the computer execution instructions stored in the memory, so that the device executes the method of any one of the first aspect or the second aspect.
  • a computer storage medium for storing computer software instructions, which includes a program for executing the method according to any one of the first aspect or the second aspect.
  • a computer program product which includes computer software instructions that can be loaded by a processor to execute a program such as the method of any one of the first aspect or the second aspect.
  • the user-side device after receiving the DTU sent by the network-side device, the user-side device generates a confirmation message and inserts the confirmation message into the DTU to be sent, that is, each DTU to be sent is carried. There is a confirmation message, so that after the user-side device sends a DTU to the network-side device, the network-side device can confirm the DTU.
  • the DTU confirmation cycle between the user-side device and the network-side device is short, which improves the DTU QoS.
  • FIG. 1 is a schematic diagram of a network scenario
  • FIG. 2 is a functional structure diagram of an existing network device
  • 3 and 4 are schematic diagrams of a network protocol model according to an embodiment of the present application.
  • FIG. 5 is a flowchart of a method for retransmitting data according to an embodiment of the present application
  • FIG. 6 is a schematic diagram of a DTU frame structure according to an embodiment of the present application.
  • FIG. 8 is a flowchart of a method for retransmitting data according to an embodiment of the present application.
  • FIG. 9 is a functional structure diagram of a network device according to an embodiment of the present application.
  • FIG. 10 is a functional structure diagram of a network device according to an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a system according to an embodiment of the present application.
  • FIG. 12 is a functional structure diagram of a network device according to an embodiment of the present application.
  • This application is generally applied to a fiber-to-the-street cabinet (FTTC) scenario, and can also be applied to fiber-to-the-building (FTTB), or copper wires are used as a means for FTTH extension.
  • the optical network provided to a distribution point unit (DPU) can be based on a point-to-multipoint (for example, PON) or point-to-point (P2P) technology.
  • Figure 1 shows a basic application reference model for user installation of plain old telephone services (POTS) based on narrowband services. POTS can also be replaced with integrated services digital network (ISDN) based on narrowband services. ).
  • the DPU may contain one or more entities with FTU-O and service separation functions.
  • the technical scenarios disclosed in this application all include network-side equipment (for example, distribution point unit (DPU) shown in FIG. 1) and user-side equipment (for example, network shown in FIG. 1).
  • Terminal network terminal, NT
  • NT network terminal
  • they are connected by copper wire, specifically, for example: twisted pair (CAT-5e of Category 5 twisted pair, Category 6 of standard twisted pair, etc.).
  • twisted pair CAT-5e of Category 5 twisted pair, Category 6 of standard twisted pair, etc.
  • one DPU device is connected to multiple NT devices, that is, the DPU needs to support the access of multiple NT devices.
  • Users can access network-side devices through user-side devices to obtain the services they need (for example: video on demand, or network television, etc.).
  • the DPU is connected to the NT through copper wires, and then can be connected to the network through the PON to provide user services.
  • the DPU uses an optical fiber to connect to an optical distribution network (ODN), and the ODN is further connected to an optical line terminal (OLT) located in a central office (CO).
  • ODN optical distribution network
  • OLT optical line terminal
  • CO central office
  • the DPU can also be directly connected to other types of network equipment (for example, GE interface equipment, DSL equipment) through optical fibers to provide user services.
  • the DPU needs to have the physical layer of optical communication and L2 and L2 and above network level processing capabilities.
  • the DPU needs to have the function of an optical network unit (ONU).
  • ONU optical network unit
  • the names of the user-side device and the network-side device are not limited in this application, and the DPU and NT are merely examples.
  • FIG. 2 is a schematic diagram of a functional structure of a device involved in this application.
  • the DPU 200 and NT 300 each include three functional parts.
  • Each NT between the DPU and multiple NT 300 ie NT-1, NT-2, ..., NT-N
  • the DPU 200 includes a transceiver unit 201, a management unit 202, and a network-side unit 203.
  • the transceiver unit and processing unit 201 may also be referred to as TU-O (transceiver unit-ONU or CO) for short.
  • the network-side processing unit 203 may include data frame processing that needs to be performed on the network side, for example, physical layer processing, layer 2 processing, and more.
  • the transceiving and processing unit 201 includes a data frame transceiving function, and also includes processing the data frame to implement user registration, bandwidth allocation, and the like.
  • the NT 300 includes a transceiver unit 301, a management unit 302, and a user-side processing unit 303.
  • the DPU 200 is different from the sending and receiving and processing unit 201, and the sending and receiving and processing unit 301 may also be referred to as a remote transmitting unit (remote, TU-R).
  • the user-side processing unit 303 may include data frame processing required by the user side, for example, providing a wired or wireless network connection to the user.
  • the transmitting and receiving and processing unit 301 includes a function of transmitting and receiving data frames, and further includes processing of the data frames, for example, implementing data frame analysis related to the access time indication disclosed in the present application. It should be noted that, depending on the degree of integration, the DPU and NT can implement the above functions through one or more boards. That is, the functions described above may be implemented by one or more processors.
  • FIGS 3 and 4 show examples of reference models for DPU 200 and NT 300.
  • the reference model may correspond to a physical (PHY) layer and may be divided into several sub-layers separated by reference points (e.g., alpha reference points and delta reference points).
  • the sub-layer may include a transport-specific protocol-specific transmission-convergence (TPS-TC) sub-layer, a physical media-specific part of a physical medium connected to the TPS-TC sub-layer through an ⁇ reference point transmission convergence (PMS-TC) sublayer, and a physical media dependent (PMD) sublayer connected to the PMS-TC sublayer through a delta reference point.
  • TPS-TC transport-specific protocol-specific transmission-convergence
  • PMS-TC ⁇ reference point transmission convergence
  • PMD physical media dependent sublayer connected to the PMS-TC sublayer through a delta reference point.
  • the ⁇ reference point describes a logical interface to the data plane between the TPS-TC and PMS-TC sublayers.
  • the data of the ⁇ reference point is a DTU stream.
  • the format of DTU is consistent for all types of TPS-TC.
  • DTUs should be sent to the ⁇ reference point in the same order as the user data packets used to generate these DTUs enter the TPS-TC layer through the ⁇ reference point.
  • DTUs should be sent to the ⁇ reference point in the order they were recovered by the PMS-TC (and after reordering).
  • the DSL system 100 in the embodiment of the present invention may be an ADSL2 system, ADSL2 + system, VDSL2 system, or any other DSL system (for example, by System defined by the International Telecommunication Union Telecommunication Standardization Organization (ITU-T) G.hn or G.fast standard).
  • ITU-T International Telecommunication Union Telecommunication Standardization Organization
  • the aforementioned TPS-TC sublayer, the PMS of the physical medium connected to the TPS-TC sublayer through the ⁇ reference point For the functions and principles of the -TC sublayer and the PMD sublayer connected to the PMS-TC sublayer through the ⁇ reference point, please refer to the introduction of the above standards, and will not be repeated here.
  • the PMS-TC layer includes a robust management channel (RMC).
  • the RMC carries the confirmation of the received DTU and the delay-sensitive management data from the G.fast transceiver unit (FTU) management entity (FTU), and submits it to PMS- through the PMS-TC_MGMT interface.
  • FTU G.fast transceiver unit
  • TC management entity
  • an acknowledgement message is inserted into a data transfer unit (Data Transfer Unit, DTU) of each transmission, and is transmitted by the DTU, which is the biggest difference from the existing standard transmission by the RMC.
  • DTU Data Transfer Unit
  • an embodiment of the present application provides a method for retransmitting data.
  • the method includes the following steps:
  • Step 401 Select a data transmission unit to be sent from the data transmission unit transmission queue and the retransmission queue.
  • the retransmission multiplexer (RTX MUX) selects the data transmission unit to be transmitted from the data transmission unit transmission queue and the retransmission queue for transmission.
  • the data transmission unit can be scrambled after the data transmission unit to be transmitted is selected, Reed-Solomon Forward Error Correction Coding (FEC) coding is used, and interleaving is used for interleaving.
  • FEC Reed-Solomon Forward Error Correction Coding
  • Step 402 Acquire the range of the received data transmission unit that needs to be confirmed according to the end time of the data transmission unit to be sent on the line, generate the confirmation message, and confirm the confirmation. A message is inserted into the data transmission unit to be sent.
  • One method is to construct a domain of the confirmation message according to the verification result of the DTU verification result received from the receiver by the confirmation message reconstruction module, and generate a confirmation message, where the confirmation message carries the data transmission unit to be sent.
  • the end time on the line corresponds to the range of received data transfer units.
  • the manner of inserting the ACK message includes, but is not limited to, the following schemes.
  • the first is to insert a predefined placeholder during DTU construction and participate in the operation of Error Check Sequence (ECS).
  • ECS Error Check Sequence
  • the second method is to perform ECS calculation after inserting the ACK, and the ACK message participates in the ECS calculation.
  • the retransmitted DTU needs to recalculate ECS because a new ACK message is inserted.
  • the third is that after the DTU is constructed, including the ECS calculation, an ACK message is inserted at a fixed position. The ACK message does not participate in the ECS operation of the DTU.
  • FIG. 6 is a representative DTU frame structure after an ACK message is inserted.
  • the DTU payload should contain the data packets and embedded operations channels (eoc) packets that the DTU needs to transmit.
  • the DTU payload contains several DTU frames, and each DTU frame contains a DTU frame header and a DTU frame payload.
  • the ECS domain is for DTU authentication.
  • the ECS should include a 32-bit cyclic redundancy check (CRC). This check should be calculated based on the sending order of the DTU header and DTU payload bytes.
  • CRC cyclic redundancy check
  • the position where the ACK message is inserted into the DTU depends on the actual needs. For example, the ACK message can be inserted into the head or the tail of the DTU. It should be noted that, in one case, the ACK message is separately encoded and inserted into the data transmission unit selected for transmission. Another way is to insert the confirmation message into the data transmission unit selected to be sent without encoding first, and then encode it together with the data transmission unit to be sent.
  • the confirmation message includes a frame header, and the frame header carries information about whether the confirmation message is valid.
  • the confirmation message also carries cyclic redundancy code check information or forward error correction check information.
  • the time position of the ACK window is shifted from the end time position of the data transmission unit on the line by the "ACK window offset" to the symbol period.
  • FIG. 7 is an example of a typical acknowledgement message transmission. In the figure, the ACK window offset is equal to one symbol period.
  • an offset of the data transmission unit to be transmitted is referred to the confirmation window according to the end time of the line to obtain the received data transmission unit that needs to be confirmed, and then the confirmed data transmission unit needs to be confirmed according to the need.
  • the received data transfer unit generates a confirmation message. Specifically, according to the end time of the data transmission unit to be sent on the line, the acknowledgement message window is shifted forward by the first ending data transmission unit after a complete discrete multi-audio modulation symbol is used as a reference point for confirmation.
  • N is equal to a predefined The number of data transmission units to be confirmed in the confirmation message.
  • a sequence identifier of any data transmission unit in the completed verification is set as a reference point, and then based on the reference point, N data transmissions received on the line before the reference point are queried.
  • Step 403 Send the data transmission unit.
  • the scrambling code interleaving process in step 401 may also be performed later.
  • One way is to scramble the DTU with the ACK message, use Reed-Solomon FEC encoding, and use a block interleaver to interleave, and extract the encoded and interleaved ACK from the DTU buffer.
  • an embodiment of the present invention further provides a method for retransmitting data in an xDSL system.
  • the method includes:
  • Step 501 Receive a data transmission unit.
  • Step 502 Obtain a confirmation message from the data transmission unit, where the confirmation message carries information about whether the transmitted data transmission unit is received correctly.
  • the data conversion unit after receiving the data transmission unit, the data conversion unit is further subjected to deinterleaving, decoding, and descrambling processing.
  • an embodiment of the present invention further provides an xDSL device, including:
  • a first processing unit 601 configured to select a data transmission unit to be sent from a data transmission unit transmission queue and a retransmission queue;
  • the second processing unit 602 is configured to acquire a range of the received data transmission unit that needs to be confirmed according to the time of the data transmission unit to be sent on the line, generate the confirmation message, and insert the confirmation message into the The data transmission unit to be sent.
  • the second processing unit refers to the confirmation window offset (ACK_WINDOW_SHIFT) according to the end time of the data transmission unit to be sent on the line, and generates the confirmation message, where the confirmation message carries the to-be-sent
  • the end time of the data transmission unit on the line corresponds to the range of the received data transmission unit, and the confirmation message is inserted into the data transmission unit to be transmitted.
  • the second processing unit is shifted forward according to the end time of the data transmission unit to be transmitted on the line, and the confirmation window is shifted by the first completed data transmission after a complete discrete multi-audio modulation symbol.
  • Unit as a reference point for confirmation; then, based on the reference point, query N data transmission units that have been received on the line before the reference point, and use the N data transmission units as data transmission units that require confirmation, where The N is equal to the number of data transmission units that need to be confirmed in the predefined confirmation message.
  • the second processing unit sets a sequence identifier of any one of the data transmission units in the completed verification as a reference point; based on the reference point, queries the N received on the line before the reference point.
  • Data transmission units using the N data transmission units as data transmission units requiring confirmation, where N is equal to the number of data transmission units requiring confirmation in the confirmation message defined in advance.
  • the sending unit 603 is configured to send the data transmission unit.
  • the confirmation message includes a frame header, and the frame header carries information about whether the confirmation message is valid.
  • the xDSL device includes a first scrambling unit, a first A coding unit and a first interleaving unit, and the first scrambling unit is configured to perform scrambling processing on the selected data transmission unit to be sent after the first processing unit selects the data transmission unit to be sent.
  • the first encoding unit is configured to perform encoding processing only on the data transmission unit processed by the first scrambling unit.
  • the first interleaving unit is configured to perform interleaving processing on the data transmission unit processed by the first coding unit.
  • the first encoding unit does not perform encoding processing on the confirmation message.
  • the ACK message is not separately encoded first, and is inserted into the data transmission unit selected for transmission after being encoded with the data transmission unit to be transmitted.
  • the xDSL device includes a second scrambling unit, a first Two encoding units and a second interleaving unit, and the second scrambling unit is configured to perform scrambling processing on the data transmission unit before the sending unit sends the data transmission unit.
  • the second encoding unit is configured to perform encoding processing on the data transmission unit processed by the second scrambling unit and the inserted confirmation message together.
  • the second interleaving unit is configured to perform interleaving processing on the data transmission unit processed by the second encoding unit.
  • the confirmation message further carries cyclic redundancy code check information or forward error correction check information.
  • an embodiment of the present invention further provides an xDSL device, which includes:
  • the receiving unit 701 is configured to receive a data transmission unit.
  • the obtaining unit 702 obtains a confirmation message from the data transmission unit, where the confirmation message carries information about whether the sent data transmission unit is received correctly.
  • the xDSL device further includes a deinterleaving unit, a decoding unit, and a descrambling unit.
  • the deinterleaving unit is configured to perform deinterleaving processing on the determined data transmission unit to be sent after the data transmission unit received by the receiving unit.
  • the decoding unit is configured to perform decoding processing on the data transmission unit processed by the deinterleaving unit.
  • the descrambling unit is configured to perform descrambling processing on the data transmission unit processed by the descoding unit.
  • an embodiment of the present application provides a system 1000.
  • the system includes the xDSL device shown in FIG. 9 (the example is the first xDSL device) and the xDSL device shown in FIG. 10 (the example in the figure is Second xDSL device).
  • FIG. 12 is a schematic block diagram of an implementation manner of an xDSL device according to an embodiment of the present application.
  • the xDSL device 1100 may include a processor 1101, a memory 1102, and a bus system 1103.
  • the processor 1101 and the memory 1102 are connected through a bus system 1103.
  • the memory 1102 is used to store instructions, and the processor 1101 is used to execute instructions stored in the memory 1102.
  • the memory of the encoding device stores the program code, and the processor may call the program code stored in the memory to execute the method for transmitting an acknowledgement message described in this application. To avoid repetition, it will not be described in detail here.
  • the processor 1101 may be a central processing unit (CPU), and the processor 1101 may also be another general-purpose processor, a digital signal processor (DSP), or an application-specific integrated circuit (ASIC). , Ready-made programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the memory 1102 may include a read-only memory (ROM) device or a random access memory (RAM) device. Any other suitable type of storage device may also be used as the memory 1102.
  • the memory 1102 may include code and data accessed by the processor 1010 using the bus 1050.
  • the memory 1030 may further include an operating system and an application program, the application program including at least one program that allows the processor 1010 to perform the method of transmitting an acknowledgement message described in this application.
  • the bus system 1103 may include a power bus, a control bus, and a status signal bus in addition to a data bus. However, for the sake of clarity, various buses are marked as the bus system 1103 in the figure.
  • an embodiment of the present application provides a computer storage medium, which is characterized in that it is used for storing computer software instructions and includes a program for executing the method shown in FIG. 4 and FIG. 7.
  • an embodiment of the present application provides a computer program product, which is characterized by including computer software instructions that can be loaded by a processor to execute the program of the method shown in FIG. 4 and FIG. 7.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be from a website site, a computer, a server, or a data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or includes one or more data storage devices such as servers, data centers, and the like that can be integrated with the medium.
  • the available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

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  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

本申请实施例应用于通信技术领域，提供一种传输确认消息的方法、装置和系统，其中所述方法包括：从数据传送单元发送队列和重传队列中选择待发送的数据传送单元；接着生成所述确认消息，所述确认消息携带有所述待发送的数据传送单元在线路上的结束时间对应已接收的数据传送单元的范围，并将所述确认消息插入到所述待发送的数据传送单元中并发送所述数据传送单元。换句话说，用户侧设备接收到网络侧设备发送的DTU后，生成确认消息并将该确认消息插入到待发送的DTU中，也就是让每个待发送的DTU都携带有确认消息，这样用户侧设备发送DTU给网络侧设备后网络侧设备即可进行DTU的确认。反之同理，用户侧设备和网络侧设备之间的DTU的确认周期短，提高了DTU的QoS。

Description

一种xDSL系统传输确认消息的方法、装置和系统 技术领域
本申请实施例涉及通信技术领域，具体涉及一种x数字用户线(x digital subscriber line，xDSL)系统传输确认消息的方法、装置和系统。
背景技术
以无源光纤网络(passive optical network,PON)为代表的光纤到户(fiber to the home，FTTH)技术已经可以在带宽上满足日益增长的对接入网络速率的预期，但在投资成本、布放与运维、稳定性等多方面都存在难以克服的限制，尤其是光纤入户的建设成本较高，全生命周期的成本投入还远远达不到运营商的期望。数字用户线(digital subscriber line，DSL)等铜线接入技术则在投资、运维等方面都存在明显的优势。运营商希望在保护和利用既有铜线投资的同时，能够提供在未来10至20年甚至更长时间内满足用户需求的宽带接入服务。
G.fast是铜线上一种新的高带宽接入技术。它由ITU-T G.9701标准定义，该标准于2014.12月正式发布。G.fast的上下行采用时分双工(time division duplexing,TDD)。TDD是一种半双工复用方式，即上下行都占用整个频段的所有子载波来发送信息，由系统分别分配时隙。同一时隙一端收发器只能发送或接收，而对端在该时隙只能采取相反的操作。
为了给用户提供更高的速率，ITU于2017年6月通过G.mgfast标准立项。G.mgFast支持铜线距离更短的应用场景，且为了达到更高的速率，提出了G.mgFast设备可以工作在全双工(full duplex，FDX)模式即上下行可以同时同频发送。
此外G.mgFast延续之前的DSL(Digital Subscriber Line,数字用户线路)系统在脉冲噪声保护方面支持重传(RTX，retransmission)。相对于之前的TDD系统G.Fast,G.mgFast由于支持FDX模式，可以通过及时地确认接收到的数据传送单元(data transfer unit，DTU)的正确性来降低端到端的时延，提供更好的服务质量(quality of service，QoS)保证。DTU组包后进行DTU相关的扰码(scrambler)，FEC编码和交织(interleaver)后映射到离散多音(discrete multi-tone，DMT)symbol(符号)上。同时发送的DTU进入重传队列，根据收到的DTU的ACK(Acknowledgement,确认)消息进行重传DTU和新发送DTU的选择。另外鲁棒性管理通道(Robust Management Channel,RMC)提供接收到的DTU的确认消息。
但是，采用TDD帧相同的帧结构以及RMC符号(symbol)进行DTU的确认，需要等待上一个ACK窗口(window)内的最后一个DTU收到后才能够进行之前DTU的确认，确认周期长，造成重传缓存大，最大重传次数小，影响DTU的QoS。
发明内容
有鉴于此，本申请实施例提供一种传输确认消息的方法、装置和系统，通过让每个DTU携带确认消息，DTU的确认周期短，提高了DTU的QoS。
第一方面，本申请实施例提供了一种xDSL系统传输确认消息的方法，所述方法包括：
从数据传送单元发送队列和重传队列中选择待发送的数据传送单元；接着生成所述确认消息，所述确认消息携带有所述待发送的数据传送单元在线路上的结束时间对应已接收的数据传送单元的范围，并将所述确认消息插入到所述待发送的数据传送单元中并发送所述数据 传送单元。
其中一种设计中，所述确认消息依据所述发送的数据传送单元在线路上的时间，确定所述确认消息所确定的已接收的数据传送单元的范围具体包括:根据所述待发送的数据传送单元在线路上的结束时间参考确认窗口偏移，得到需要确认的已接收的数据传送单元；根据所述需要确认的已接收的数据传送单元，生成确认消息。
其中一种设计中，所述根据所述待发送的数据传送单元在线路上的结束时间参考确认窗口偏移，得到需要确认的已接收的数据传送单元具体包括:根据所述待发送的数据传送单元在线路上的结束时间向前位移所述确认窗口偏移个完整的离散多音频调制符号之后的第一个结束的数据传送单元作为确认的参考点；以所述参考点为基础查询所述参考点之前线路上已接收的N个数据传送单元，将所述N个数据传送单元作为需要确认的数据传送单元，其中所述N等于预先定义的所述确认消息中需要确认的数据传送单元的个数。
其中一种设计中，所述根据所述待发送的数据传送单元在线路上的结束时间参考确认窗口偏移，得到需要确认的已接收的数据传送单元具体包括:将已完成校验中的任意一个数据传送单元的序列标识符设置为参考点；以所述参考点为基础查询所述参考点之前线路上已接收的N个数据传送单元，将所述N个数据传送单元作为需要确认的数据传送单元，其中所述N等于预先定义的所述确认消息中需要确认的数据传送单元的个数。
其中一种设计中，所述确认消息包括帧头，所述帧头内携带有所述确认消息是否有效的信息。
其中一种设计中，所述确认消息经过编码后插入到所述选择待发送的数据传送单元中。
其中一种设计中，所述确认消息插入到所述选择待发送的数据传送单元中后与所述待发送的数据传送单元一起编码。
其中一种设计中，所述确认消息还携带有循环冗余码校验信息或者前向纠错校验信息。
第二方面，提供了一种xDSL系统重传数据的方法，所述方法包括：接收数据传送单元；从所述数据传送单元中获取确认消息，所述确认消息携带已发送的数据传送单元是否被正确接收的信息。
其中一种设计中，所述接收数据传送单元之后还包括：对所述数据转换单元进行解交织、解编码和解扰码处理。
第三方面，提供了一种xDSL设备，包括：
第一处理单元，用于从数据传送单元发送队列和重传队列中选择待发送的数据传送单元；
第二处理单元，用于根据所述待发送的数据传送单元在线路上的结束时间获取要生成的确认消息需要确认的已接收的数据传送单元的范围，生成所述确认消息并将所述确认消息插入到所述待发送的数据传送单元中；
发送单元，用于发送所述数据传送单元。
其中一种设计中，所述第二处理单元具体用于：生成所述确认消息，所述确认消息携带有所述待发送的数据传送单元在线路上的结束时间对应已接收的数据传送单元的范围，并将所述确认消息插入到所述待发送的数据传送单元中。
其中一种设计中，所述第二处理单元具体用于：根据所述待发送的数据传送单元在线路上的结束时间向前位移所述确认窗口偏移个完整的离散多音频调制符号之后的第一个结束的 数据传送单元作为确认的参考点；以所述参考点为基础查询所述参考点之前线路上已接收的N个数据传送单元，将所述N个数据传送单元作为需要确认的数据传送单元，其中所述N等于预先定义的所述确认消息中需要确认的数据传送单元的个数。
其中一种设计中，所述第二处理单元具体用于：将已完成校验中的任意一个数据传送单元的序列标识符设置为参考点；以所述参考点为基础查询所述参考点之前线路上已接收的N个数据传送单元，将所述N个数据传送单元作为需要确认的数据传送单元，其中所述N等于预先定义的所述确认消息中需要确认的数据传送单元的个数。
其中一种设计中，所述确认消息包括帧头，所述帧头内携带有所述确认消息是否有效的信息。
其中一种设计中，该xDSL设备还包括第一扰码单元、第一编码单元和第一交织单元，所述第一扰码单元用于在所述第一处理单元选择待发送的数据传送单元后对所述选择的待发送的数据传送单元进行扰码处理；所述第一编码单元用于对所述第一扰码单元处理后的数据传送单元进行编码处理；所述第一交织单元用于对所述第一编码单元处理后的数据传送单元进行交织处理。
其中一种设计中，该xDSL设备还包括第二扰码单元、第二编码单元和第二交织单元，所述第二扰码单元用于在所述发送单元发送所述数据传送单元之前对所述数据传送单元进行扰码处理；所述第二编码单元用于对所述第二扰码单元处理后的数据传送单元和所述确认消息进行编码处理；所述第二交织单元用于对所述第二编码单元处理后的数据传送单元进行交织处理。
第四方面，提供了一种xDSL设备，包括：
接收单元，用于接收数据传送单元；
获取单元，从所述数据传送单元中获取确认消息，所述确认消息携带已发送的数据传送单元是否被正确接收的信息。
其中一种设计中，该xDSL设备还包括解扰码单元、解编码单元和解交织单元，所述解扰码单元用于对所述接收单元接收的数据传送单元后对所述选择的待发送的数据传送单元进行解扰码处理；所述解编码单元用于对所述解扰码单元处理后的数据传送单元进行解编码处理；所述解交织单元用于对所述解编码单元处理后的数据传送单元进行解交织处理。
第五方面，提供了一种设备，包括：处理器、存储器、总线和通信接口；该存储器用于存储计算机执行指令，该处理器与该存储器通过该总线连接，当该设备运行时，该处理器执行该存储器存储的该计算机执行指令，以使该装置执行所述第一方面或者第二方面任意一项的方法。
第六方面，提供了一种计算机存储介质，用于储存计算机软件指令，其包括用于执行如第一方面或者第二方面任意一项的方法的程序。
第七方面，提供了一种计算机程序产品，其特征在于，包括计算机软件指令，该计算机软件指令可通过处理器进行加载来执行如第一方面或者第二方面任意一项的方法的程序。
综上所述，该申请实施例中用户侧设备接收到网络侧设备发送的DTU后，生成确认消息并将该确认消息插入到待发送的DTU中，也就是让每个待发送的DTU都携带有确认消息，这样用户侧设备发送DTU给网络侧设备后网络侧设备即可进行DTU的确认。反之同理，用户侧设备和网络侧设备之间的DTU的确认周期短，提高了DTU的QoS。
附图说明
图1为一种网络场景示意图；
图2为现有一种网络设备的功能结构示意图；
图3和图4为本申请实施例提供的一种网络协议模型的示意图；
图5为本申请实施例提供了一种重传数据的方法流程图；
图6为本申请实施例提供了一种DTU帧结构示意图；
图8为本申请实施例提供了一种重传数据的方法流程图；
图7为一种确认消息下行传输的示例图；
图9为本申请实施例提供的一种网络设备的功能结构示意图；
图10为本申请实施例提供的一种网络设备的功能结构示意图；
图11为本申请实施例提供的一种系统结构示意图；
图12为本申请实施例提供的一种网络设备的功能结构示意图。
具体实施方式
本发明的实施例中，为了使本发明的目的、技术方案及有益效果更加清楚明白，以下结合附图及实施例，对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本申请通常应用于光纤到街边柜(fiber to the curb，FTTC)场景，也可应用于光纤到楼(fiber to the building，FTTB)，或者把铜线作为FTTH延伸的手段。向分布点单元(distribution point unit,DPU)提供的光网络可以基于点到多点(例如，PON)或者点到点(point to point，P2P)技术。
街边柜布放场景要求终端客户能够自主完成终端设备安装，对终端客户自安装设备的要求适用于所有应用参考模型。图1显示了基于窄带服务的普通老式电话业务(plain old telephone service，POTS)用户自安装的基本应用参考模型，其中POTS也可以替换为基于窄带服务的综合业务数字网(integrated services digital network，ISDN)。DPU可以含有一个或多个FTU-O和服务分离功能的实体。
如图1所示，本申请揭示的技术场景中都包括网络侧设备(例如，图1所示的分布点单元(distribution point unit,DPU))和用户侧设备(例如，图1所示的网络终端(network terminal，NT))，他们之间通过铜线连接，具体地，例如：双绞线(超5类双绞线CAT-5e，6类标准双绞线CAT-6等)。通常地，一个DPU设备跟多个NT设备连接，也就是说DPU要支持多个NT设备的接入。用户可以通过用户侧设备来接入网络侧设备，以获取其所需的服务(例如：视频点播，或者网络电视等)。
如图1所示，DPU通过铜线跟NT连接，然后可以通过PON进行网络连接来提供用户业务。具体地，DPU使用光纤跟光配线网络(optical distribution network，ODN)连接，ODN进一步跟位于中心局(central office，CO)的光线路终端(optical line terminal，OLT)连接。或者，DPU还可以直接通过光纤跟其他类型的网络设备连接(例如，GE接口设备，DSL设备)，以提供用户服务。需要说明的是，如果跟PON网络相连，那么DPU需要具备光通信的物理层和L2以及L2以上网络层次的处理能力。例如，DPU需要具备光网络单元(optical network unit， ONU)的功能。还需要说明的是，本申请对用户侧设备和网络侧设备的名称不做限定，其中，DPU和NT仅是示例。
下面进一步来说明网络侧设备和用户侧设备的功能结构。图2为本申请所涉及的设备的功能结构示意图。如图2所示，DPU 200和NT 300都包括三个功能部分，DPU和多个NT 300(即NT-1,NT-2，…,NT-N)之间的每一个NT通过铜线400相连。其中，DPU 200包括收发和处理单元201，管理单元202，网络侧单元203。收发和处理单元201也可以简称为TU-O(transceiver unit-ONU或CO)。其中，网络侧处理单元203可以包括网络侧需要进行的数据帧处理，例如：物理层处理，2层以及2层以上的处理等。收发和处理单元201包括数据帧的收发功能，还包括对数据帧处理以实现用户注册，带宽分配等。类似地，NT 300包括收发和处理单元301，管理单元302，用户侧处理单元303。与DPU 200的收发和处理单元201以示区别，收发和处理单元301也可以简称为远端的发送单元(transceiver unit–remote，TU-R)。其中，用户侧处理单元303可以包括用户侧需要进行的数据帧处理，例如：给用户提供有线或者无线的网络连接等。收发和处理单元301包括数据帧的收发功能，还包括对数据帧处理，例如：实施本申请揭示的接入时间指示相关的数据帧解析等。需要说明的是，根据集成度的不同，DPU和NT可以通过一个或者多个单板来实现上述功能。也就是说，可以通过一个或者多个处理器来实现上述的功能。
图3和图4示出了DPU 200和NT 300的参考模型的实施例。参考模型可对应于物理(PHY)层，可分成若干子层，这些子层通过参考点(例如，α参考点和δ参考点)隔开。例如，子层可包括传送协议特定传输聚合(transport protocol specific–transmission convergence，TPS-TC)子层、通过α参考点连接到TPS-TC子层的物理介质的物理介质特定部分(physical media specific-transmission convergence，PMS-TC)子层，以及通过δ参考点连接到PMS-TC子层的物理介质相关(Physical media dependent，PMD)子层。α参考点描述了TPS-TC和PMS-TC子层之间数据平面的一个逻辑接口。在发送和接收方向上，α参考点的数据都是一个DTU流。对所有类型的TPS-TC，DTU的格式是一致的。在发送方向，DTU应以用于产生这些DTU的用户数据包通过γ参考点进入TPS-TC层相同的顺序发往α参考点。在接收方向，DTU应按照它们被PMS-TC恢复的顺序(并且重排序后)发往α参考点。
本领域普通技术人员能够根据以下标准理解术语“参考点”和“子层”：例如，于2011年12月公布的题为“甚高速数字用户线收发信机2(Very high speed digital subscriber line transceivers2,VDSL2)”的国际电信联盟(ITU)标准G.993.2，以及于2010年6月公布的题为“用于DSL收发信机的改进的脉冲噪声保护((Improved Impulse Noise Protection(INP)for DSL Transceivers)”的ITU标准G.998.4，其全部内容以引入方式并入本申请中。其中，本发明实施例DSL系统100可以是ADSL2系统、ADSL2+系统、VDSL2系统或任何其他DSL系统(例如，由国际电信联盟电信标准化组织(ITU-T)G.hn或G.fast标准定义的系统)。前述提到的TPS-TC子层、通过α参考点连接到TPS-TC子层的物理介质的PMS-TC子层，以及通过δ参考点连接到PMS-TC子层的PMD子层的功能和原理请参考上述标准的介绍，在此不再赘述。
现有的标准中PMS-TC层包括鲁棒管理通道(robust management channel，RMC)。RMC携带接收到的DTU和来自G.fast收发器单元(G.fast transceiver unit，FTU)管理实体(FTU management entity,FME)的时延敏感管理数据的确认，通过PMS-TC_MGMT接口提交给 PMS-TC。本发明实施例提供的重传数据的方法，确认消息插入到每个传输的数据传送单元(Data Transfer Unit，DTU)中，由DTU传输，这是跟现有标准由RMC传输最大的区别。
如图5所示，本申请实施例提供了一种重传数据的方法，该方法包括以下步骤：
步骤401：从数据传送单元发送队列和重传队列中选择待发送的数据传送单元。
在发送方向，重传复用器(RTX MUX)从数据传送单元发送队列和重传队列中选择待发送的数据传送单元进行传输。
一种实施例中，选择待发送的数据传送单元后即可以对数据传送单元进行加扰，使用里德-所罗门前向纠错编码(Forward Error Correction，FEC)编码，并使用交织器进行交织。
步骤402：根据所述待发送的数据传送单元在线路上的结束时间获取要生成的确认消息(Acknowledgement,ACK)需要确认的已接收的数据传送单元的范围，生成所述确认消息并将所述确认消息插入到所述待发送的数据传送单元中。
一种方式是，通过确认消息重构模块从接收器接收到的DTU的校验结果后，根据校验结果构建确认消息的域，生成确认消息，确认消息携带有所述待发送的数据传送单元在线路上的结束时间对应已接收的数据传送单元的范围。
插入ACK消息的方式包括但不限于以下方案。第一种是DTU构建时插入预定义的占位符(placeholder)，参与错误校验序列(Error Check Sequence，ECS)的运算，插入ACK消息时，将占位符替换为ACK，ACK消息不参与DTU的ECS校验的计算。第二种方式是在插入ACK后进行ECS的计算，ACK消息参与ECS的计算。重传的DTU由于插入了新的ACK消息需要重新计算ECS。第三种是，DTU构建完成，包括ECS计算后，在固定的位置插入ACK消息。ACK消息不参与DTU的ECS运算。ACK消息插入DTU的位置可以并没有固定限制，可以是DTU的头部，可以是中间位置，也可以是ECS之前的位置均可以。图6为一种代表性的插入ACK消息后的DTU帧结构。DTU净荷应包含DTU需传输的数据包和内嵌操作通道(embedded operations channel，eoc)包。DTU净荷包含若干个DTU帧，每个DTU帧包含一个DTU帧头和DTU帧净荷。ECS域是为了DTU验证。ECS应包含一个32比特的循环冗余校验(cyclic redundancy check,CRC)，这个校验应在基于DTU头和DTU净荷字节的发送顺序进行计算。
ACK消息插入DTU的位置根据实际需求而定，比如ACK消息插入DTU的头部或者尾部都可以。需要说明的是，一种情况是ACK消息单独编码后插入到所述选择待发送的数据传送单元中。还一种方式是确认消息先不单独编码插入到选择待发送的数据传送单元中后与所述待发送的数据传送单元一起编码。
可选的，确认消息包括帧头，所述帧头内携带有所述确认消息是否有效的信息。可选的，确认消息还携带有循环冗余码校验信息或者前向纠错校验信息。
ACK窗口的时间位置相对于ACK消息所在的数据传送单元在线路上的结束时间位置由“ACK窗口偏移”进行符号周期偏移。图7为一种代表性的确认消息传输的示例，图中以ACK窗口偏移等于一个符号周期示例。
其中步骤402中，一种实施例中，根据所述待发送的数据传送单元在线路上的结束时间参考确认窗口偏移，得到需要确认的已接收的数据传送单元，再根据所述需要确认的已接收的数据传送单元，生成确认消息。具体地，根据所述待发送的数据传送单元在线路上的结束时间向前位移所述确认消息窗口偏移个完整的离散多音频调制符号之后的第一个结束的数据 传送单元作为确认的参考点，再以所述参考点为基础查询所述参考点之前线路上已接收的N个数据传送单元，将所述N个数据传送单元作为需要确认的数据传送单元，其中所述N等于预先定义的所述确认消息中需要确认的数据传送单元的个数。
一种实施例中，将已完成校验中的任意一个数据传送单元的序列标识符设置为参考点，再以所述参考点为基础查询所述参考点之前线路上已接收的N个数据传送单元，将所述N个数据传送单元作为需要确认的数据传送单元，其中所述N等于预先定义的所述确认消息中需要确认的数据传送单元的个数。
步骤403：发送所述数据传送单元。
步骤401中的扰码编码交织处理也可以后面进行。一种方式是，对带有ACK消息的DTU进行加扰，使用里德-所罗门FEC编码，并使用块交织器进行交织，将经过编码和交织后的ACK从DTU缓存中提取出来。
如图8所示，本发明实施例还提供了一种xDSL系统重传数据的方法，该方法包括：
步骤501：接收数据传送单元；
步骤502：从所述数据传送单元中获取确认消息，所述确认消息携带已发送的数据传送单元是否被正确接收的信息。
一实施例中，接收到数据传送单元之后还进一步对数据转换单元进行解交织、解编码、解扰码的处理。
如图9所示，本发明实施例还提供了一种xDSL设备，包括：
第一处理单元601，用于从数据传送单元发送队列和重传队列中选择待发送的数据传送单元；
第二处理单元602，用于根据待发送的数据传送单元在线路上的时间获取要生成的确认消息需要确认的已接收的数据传送单元的范围，生成所述确认消息并将所述确认消息插入到所述待发送的数据传送单元中。
其中一实施例中，第二处理单元根据所述待发送的数据传送单元在线路上的结束时间参考确认窗口偏移(ACK_WINDOW_SHIFT)，生成所述确认消息，所述确认消息携带有所述待发送的数据传送单元在线路上的结束时间对应已接收的数据传送单元的范围，并将所述确认消息插入到所述待发送的数据传送单元中。
其中一实施例中，第二处理单元根据所述待发送的数据传送单元在线路上的结束时间向前位移所述确认窗口偏移个完整的离散多音频调制符号之后的第一个结束的数据传送单元作为确认的参考点；然后，以所述参考点为基础查询所述参考点之前线路上已接收的N个数据传送单元，将所述N个数据传送单元作为需要确认的数据传送单元，其中所述N等于预先定义的所述确认消息中需要确认的数据传送单元的个数。
其中一实施例中，第二处理单元将已完成校验中的任意一个数据传送单元的序列标识符设置为参考点；以所述参考点为基础查询所述参考点之前线路上已接收的N个数据传送单元，将所述N个数据传送单元作为需要确认的数据传送单元，其中所述N等于预先定义的所述确认消息中需要确认的数据传送单元的个数。
发送单元603，用于发送所述数据传送单元。
可选的，确认消息包括帧头，所述帧头内携带有所述确认消息是否有效的信息。
前面提到，由于ACK消息插入DTU的头部或者尾部都可以，ACK消息单独编码后插入到所述选择待发送的数据传送单元中，此种情况下，xDSL设备包括第一扰码单元、第一编码单元和第一交织单元，所述第一扰码单元用于在所述第一处理单元选择待发送的数据传送单元后对所述选择的待发送的数据传送单元进行扰码处理。第一编码单元用于仅仅对所述第一扰码单元处理后的数据传送单元进行编码处理。第一交织单元用于对所述第一编码单元处理后的数据传送单元进行交织处理。这里第一编码单元不对确认消息进行编码处理。
前面提到，ACK消息先先不单独编码，插入到选择待发送的数据传送单元中后与所述待发送的数据传送单元一起编码，这种情况下，xDSL设备包括第二扰码单元、第二编码单元和第二交织单元，所述第二扰码单元用于在所述发送单元发送所述数据传送单元之前对所述数据传送单元进行扰码处理。第二编码单元用于对所述第二扰码单元处理后的数据传送单元以及插入的确认消息一起进行编码处理。第二交织单元用于对所述第二编码单元处理后的数据传送单元进行交织处理。
其中一实施例中，所述确认消息还携带有循环冗余码校验信息或者前向纠错校验信息。
如图10所示，本发明实施例还提供了一种xDSL设备，其特征在于，包括：
接收单元701，用于接收数据传送单元。
获取单元702，从所述数据传送单元中获取确认消息，所述确认消息携带已发送的数据传送单元是否被正确接收的信息。
其中一实施例中，该xDSL设备还包括解交织单元、解编码单元和解扰码单元，解交织单元用于对接收单元接收的数据传送单元后对确定的待发送的数据传送单元进行解交织处理。解编码单元用于对解交织单元处理后的数据传送单元进行解编码处理。解扰码单元用于对解编码单元处理后的数据传送单元进行解扰码处理。
如图11所示，本申请实施例提供了一种系统1000，该系统包括图9所示的xDSL设备(图中示例为第一xDSL设备)以及图10所示的xDSL设备(图中示例为第二xDSL设备)。
图12为本申请实施例的xDSL设备的一种实现方式的示意性框图。其中，xDSL设备1100可以包括处理器1101、存储器1102和总线系统1103。其中，处理器1101和存储器1102通过总线系统1103相连，该存储器1102用于存储指令，该处理器1101用于执行该存储器1102存储的指令。编码设备的存储器存储程序代码，且处理器可以调用存储器中存储的程序代码执行本申请描述的传输确认消息的方法。为避免重复，这里不再详细描述。
在本申请实施例中，该处理器1101可以是中央处理单元(central processing unit，CPU)，该处理器1101还可以是其他通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现成可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
该存储器1102可以包括只读存储器(ROM)设备或者随机存取存储器(RAM)设备。任何其他适宜类型的存储设备也可以用作存储器1102。存储器1102可以包括由处理器1010使用总线1050访问的代码和数据。存储器1030可以进一步包括操作系统和应用程序，该应用程序包括允许处理器1010执行本申请描述的传输确认消息的方法的至少一个程序。
该总线系统1103除包括数据总线之外，还可以包括电源总线、控制总线和状态信号总线等。但是为了清楚说明起见，在图中将各种总线都标为总线系统1103。
处理器1101执行上述步骤时的更多细节可以参照上述方法各个实施例及附图的相关 描述，此处不再赘述。
本发明实施例同样具有上述各个方法实施例中所描述的各种有益效果，在此不再赘述。
另，本申请实施例提供了一种计算机存储介质，其特征在于，用于储存计算机软件指令，其包括用于执行前述图4和图7所示的方法的程序。
另，本申请实施例提供了一种计算机程序产品，其特征在于，包括计算机软件指令，该计算机软件指令可通过处理器进行加载来执行前述图4和图7所示的方法的程序。
该装置各个模块执行上述步骤时的更多细节可以参照上述方法各个实施例及附图的相关描述，此处不再赘述。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、DSL)或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中，本领域技术人员通过查看所述附图、公开内容、以及所附权利要求书，可理解并实现所述公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (23)

  1. 一种xDSL系统传输确认消息的方法，其特征在于，所述方法包括：
    从数据传送单元发送队列和重传队列中选择待发送的数据传送单元；
    生成所述确认消息，所述确认消息携带有所述待发送的数据传送单元在线路上的结束时间对应已接收的数据传送单元的范围，并将所述确认消息插入到所述待发送的数据传送单元中；
    发送所述数据传送单元。
  2. 根据权利要求1所述的方法，其特征在于，所述确认消息依据所述发送的数据传送单元在线路上的时间，确定所述确认消息所确定的已接收的数据传送单元的范围具体包括:
    根据所述待发送的数据传送单元在线路上的结束时间参考确认窗口偏移，得到需要确认的已接收的数据传送单元；
    根据所述需要确认的已接收的数据传送单元，生成确认消息。
  3. 根据权利要求2所述的方法，其特征在于，所述根据所述待发送的数据传送单元在线路上的结束时间参考确认窗口偏移，得到需要确认的已接收的数据传送单元具体包括:
    根据所述待发送的数据传送单元在线路上的结束时间向前位移所述确认窗口偏移个完整的离散多音频调制符号之后的第一个结束的数据传送单元作为确认的参考点；
    以所述参考点为基础查询所述参考点之前线路上已接收的N个数据传送单元，将所述N个数据传送单元作为需要确认的数据传送单元，其中所述N等于预先定义的所述确认消息中需要确认的数据传送单元的个数。
  4. 根据权利要求1所述的方法，其特征在于，所述包括:
    将已完成校验中的任意一个数据传送单元的序列标识符设置为参考点；
    以所述参考点为基础查询所述参考点之前线路上已接收的N个数据传送单元，将所述N个数据传送单元作为需要确认的数据传送单元，其中所述N等于预先定义的所述确认消息中需要确认的数据传送单元的个数。
  5. 根据权利要1～4任一项所述的方法，其特征在于，所述确认消息包括帧头，所述帧头内携带有所述确认消息是否有效的信息。
  6. 根据权利要1～4任一项所述的方法，其特征在于，所述确认消息经过编码后插入到所述选择待发送的数据传送单元中。
  7. 根据权利要求1～4任一项所述的方法，其特征在于，所述确认消息插入到所述选择待发送的数据传送单元中后与所述待发送的数据传送单元一起编码。
  8. 如权利要求1～4任一项所述的方法，其特征在于，所述确认消息还携带有循环冗余码校验信息或者前向纠错校验信息。
  9. 一种xDSL系统传输确认消息的方法，其特征在于，所述方法包括：
    接收数据传送单元；
    从所述数据传送单元中获取确认消息，所述确认消息携带已发送的数据传送单元是否被正确接收的信息。
  10. 如权利要求9所述的方法，其特征在于，所述接收数据传送单元之后还包括：
    对所述数据转换单元进行解交织、解编码和解扰码处理。
  11. 一种xDSL设备，其特征在于，包括：
    第一处理单元，用于从数据传送单元发送队列和重传队列中选择待发送的数据传送单元；
    第二处理单元，用于生成所述确认消息，所述确认消息携带有所述待发送的数据传送单元在线路上的结束时间对应已接收的数据传送单元的范围，并将所述确认消息插入到所述待发送的数据传送单元中；
    发送单元，用于发送所述数据传送单元。
  12. 根据所述权利要求11所述的xDSL设备，其特征在于，所述第二处理单元具体用于：根据所述待发送的数据传送单元在线路上的结束时间参考确认窗口偏移，得到需要确认的已接收的数据传送单元；根据所述需要确认的已接收的数据传送单元，生成确认消息。
  13. 根据所述权利要求12所述的xDSL设备，其特征在于，所述第二处理单元具体用于：根据所述待发送的数据传送单元在线路上的结束时间向前位移所述确认窗口偏移个完整的离散多音频调制符号之后的第一个结束的数据传送单元作为确认的参考点；以所述参考点为基础查询所述参考点之前线路上已接收的N个数据传送单元，将所述N个数据传送单元作为需要确认的数据传送单元，其中所述N等于预先定义的所述确认消息中需要确认的数据传送单元的个数。
  14. 根据所述权利要求11所述的xDSL设备，其特征在于，所述第二处理单元具体用于：将已完成校验中的任意一个数据传送单元的序列标识符设置为参考点；以所述参考点为基础查询所述参考点之前线路上已接收的N个数据传送单元，将所述N个数据传送单元作为需要确认的数据传送单元，其中所述N等于预先定义的所述确认消息中需要确认的数据传送单元的个数。
  15. 根据权利要11～14任一项所述的xDSL设备，其特征在于，所述确认消息包括帧头，所述帧头内携带有所述所述确认消息是否有效的信息。
  16. 根据权利要11～14任一项所述的xDSL设备，其特征在于，还包括第一扰码单元、第一编码单元和第一交织单元，所述第一扰码单元用于在所述第一处理单元选择待发送的数据传送单元后对所述选择的待发送的数据传送单元进行扰码处理；所述第一编码单元用于对所述第一扰码单元处理后的数据传送单元进行编码处理；所述第一交织单元用于对所述第一编码单元处理后的数据传送单元进行交织处理。
  17. 根据权利要11～14任一项所述的xDSL设备，其特征在于，还包括第二扰码单元、第二编码单元和第二交织单元，所述第二扰码单元用于在所述发送单元发送所述数据传送单元之前对所述数据传送单元进行扰码处理；所述第二编码单元用于对所述第二扰码单元处理后的数据传送单元和所述确认消息进行编码处理；所述第二交织单元用于对所述第二编码单元处理后的数据传送单元进行交织处理。
  18. 如权利要求11～14任一项所述的xDSL设备，其特征在于，所述确认消息还携带有循环冗余码校验信息或者前向纠错校验信息。
  19. 一种xDSL设备，其特征在于，包括：
    接收单元，用于接收数据传送单元；
    获取单元，从所述数据传送单元中获取确认消息，所述确认消息携带已发送的数据传送单元是否被正确接收的信息。
  20. 根据权利要求19所述的xDSL设备，其特征在于，还包括解扰码单元、解编码单 元和解交织单元，所述解扰码单元用于对所述接收单元接收的数据传送单元后对所述选择的待发送的数据传送单元进行解扰码处理；所述解编码单元用于对所述解扰码单元处理后的数据传送单元进行解编码处理；所述解交织单元用于对所述解编码单元处理后的数据传送单元进行解交织处理。
  21. 一种设备，其特征在于，包括：处理器、存储器、总线和通信接口；该存储器用于存储计算机执行指令，该处理器与该存储器通过该总线连接，当该设备运行时，该处理器执行该存储器存储的该计算机执行指令，以使该装置执行如权利要求1-8或者权利要求9-10任意一项的方法。
  22. 一种计算机存储介质，其特征在于，用于储存计算机软件指令，其包括用于执行如权利要求1-8或者权利要求9-10任意一项的方法的程序。
  23. 一种计算机程序产品，其特征在于，包括计算机软件指令，该计算机软件指令可通过处理器进行加载来执行如权利要求1-8或者权利要求9-10任意一项的方法的程序。
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