WO2010115378A1 - 一种数字用户线路的数据传输方法、装置及系统 - Google Patents

一种数字用户线路的数据传输方法、装置及系统 Download PDF

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Publication number
WO2010115378A1
WO2010115378A1 PCT/CN2010/071652 CN2010071652W WO2010115378A1 WO 2010115378 A1 WO2010115378 A1 WO 2010115378A1 CN 2010071652 W CN2010071652 W CN 2010071652W WO 2010115378 A1 WO2010115378 A1 WO 2010115378A1
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Prior art keywords
data
retransmission
service
data unit
service data
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PCT/CN2010/071652
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English (en)
French (fr)
Inventor
吴安妮
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP10761207.9A priority Critical patent/EP2410689B1/en
Priority to ES10761207.9T priority patent/ES2462969T3/es
Publication of WO2010115378A1 publication Critical patent/WO2010115378A1/zh
Priority to US13/270,026 priority patent/US9021326B2/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/1887Scheduling and prioritising arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L2001/0098Unequal error protection

Definitions

  • the present invention relates to the field of communications, and in particular, to a data transmission method, apparatus, and system for a digital subscriber line.
  • Digital Subscriber Line (DSL) technology is a high-speed transmission technology for data transmission over a telephone twisted pair, that is, an unshielded twisted pair. Because the pairs of twisted pairs used by DSL are unshielded. The electromagnetic interference between the pairs will cause errors, resulting in a decrease in the transmission quality of the line.
  • error correction codes are usually used to correct the error generated by the DSL line in the transmitted data, such as interleaving plus RS (Reed-Solomon) coding, and the coding gain provided by the RS coding is additionally used to reduce the impulse noise. The resulting impact, thereby improving the stability of the DSL system.
  • the original RS code needs to use an RS codeword with more check bytes and a smaller length. At this time, the net gain of the RS code becomes negative. The value is not conducive to the increase in speed.
  • RS coding will introduce more redundancy (ie, check bytes), resulting in a negative net coding gain and a reduced rate.
  • the impulse noise protection INP, Impulse Noise Protection
  • RS coding is mainly used to cope with the effect of stable noise on the DSL system (ie, bit error).
  • the system's resistance to impulse noise is further weakened.
  • the physical layer retransmission scheme emerges as the times require, and the other is located in the PMS-TC layer (Physical Media Specific Transmission Convergence sub-layer).
  • the retransmission mechanism can retransmit the data corrupted by the impulse noise, thereby reducing the bit error rate of the line and improving the stability of the service.
  • the technology mitigates the impact of impulse noise on the system to a certain extent and improves the service stability of the system, the benefit is based on increasing the service delay and the low net rate of the line.
  • the PMS-TC layer cannot know the type of service that carries data, and multiple services may be carried in the same channel at the same time.
  • the existing retransmission system located in the PMS-TC layer has an additional delay of about 10 ms or more.
  • the retransmission technology can reduce the bit error rate of the line within the delay range that the user can tolerate, and can improve the user experience quality.
  • QoE Quality of Experience
  • there are still services in the network that have low bit error rate requirements and high latency requirements such as VoIP.
  • the delays caused by retransmissions to these services are unbearable to users, which greatly affects users. QoE may even lead to user complaints.
  • a data transmission method for a digital subscriber line comprising the following steps:
  • the service data is divided into retransmission service data and non-retransmission service data;
  • the sender sends a data unit carrying the service data
  • the sender receives a retransmission request of the information of the data unit that needs to be retransmitted after the bearer is determined according to the error code and the retransmission service type;
  • a DSL transceiver for transmitting and receiving data comprising: a service type dividing module, configured to divide different service data into two types: a retransmission service and a non-retransmission service;
  • the retransmission judgment module is configured to determine whether the service data requested to be retransmitted includes retransmission service data, and if the retransmission service data is not included, the service data is not retransmitted;
  • the resource division module is configured to allocate a corresponding number of RS codewords for the two types of services in the data unit with the RS codeword as the granularity, or allocate a corresponding number of integer data units for the two types of services.
  • a data transmission system for a digital subscriber line comprising:
  • a central office device configured to send data to the client device and receive data sent by the user equipment;
  • the client device is connected to the central office device, and configured to receive data sent by the central office device and to the central office
  • the device sends data, and is characterized in that it further includes a retransmission judging module, configured to determine whether the received data has an error, and if there is no error, it is not required to send a retransmission request message to the central office device, if there is an error, Further determining whether the service to which the data unit belongs is retransmission service data, and if it is non-retransmission service data, not transmitting a retransmission request message to the central office device, if some or all of the data in the data unit is retransmitted service data And sending a retransmission request message to the central office device.
  • Embodiments of the present invention divide a service into a retransmission service and a non-retransmission service at a retransmission layer located at a PMS-TC layer, and the scheme can retransmit the retransmission service data damaged by impulse noise.
  • the transmitted, non-retransmitted service data that is corrupted is not resent. This not only enables the system to solve the influence of impulse noise well, but also strives for low line error rate and improves system stability. At the same time, it can also improve user QoE and provide better service for users.
  • FIG. 1 is a schematic structural diagram of a system according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a digital subscriber line access multiplexer according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of service segmentation by using RS codewords as a granularity according to an embodiment of the present invention
  • FIG. 3b is a schematic diagram of service segmentation by using a data unit as a granularity according to an embodiment of the present invention
  • 4a is a flowchart of a method for processing a receiver according to a first embodiment of the present invention
  • 4b is a flowchart of a method for processing a sender according to the first embodiment of the present invention
  • 5a-c are schematic diagrams of three data retransmission methods according to a first embodiment of the present invention.
  • FIG. 6a is a flowchart of a method for processing a receiver according to a second embodiment of the present invention
  • FIG. 6b is a flowchart of a method for processing a sender according to a second embodiment of the present invention.
  • the data transmission system of the digital subscriber line includes: a client device 12 and a central office device 16, and the client device 12 is usually a digital subscriber line modem, and may also be other forms of DSL transceiver.
  • the client device 12 can be linked to the central office device 16, and the client device 12 can transmit data to the central office device 16, and can also receive and process data sent by the central office device 16.
  • It further includes a housing, a transmitting unit and a receiving unit, the transmitting unit and the receiving unit being disposed in the housing for transmitting and receiving data.
  • the central office device 16 is specifically a Digital Subscriber Line Access Multiplexer (DSLAM) or other forms of DSL transceiver, and the digital subscriber line access multiplexer also includes a casing, a transmitting unit, and a receiving unit.
  • the transmitting unit and the receiving unit are disposed in the housing for transmitting and receiving data.
  • the central office device 16 is used as the sender, and the client device 12 is used as the receiver.
  • the client device 12 can also serve as the sender, and the client device 16 can serve as the receiver.
  • the central office device 16 further includes a service type division module, a resource division module, a data unit encapsulation module, and a retransmission judgment module.
  • the service type division module is configured to divide different service data into two types according to different delay and/or bit error rate requirements in the retransmission layer located at the PMS-TC layer: retransmission service and non-retransmission service. And stored separately in two different data buffers.
  • the resource division module uses the RS codeword as the granularity in the data unit to allocate a corresponding number of RS codewords for the two types of services, and separately identifies the two types of service data in the data unit to distinguish the service type to which the service belongs, that is, whether it is Retransmit the business.
  • the data unit encapsulation module fills the corresponding data according to the resources allocated by the resource allocation module for the two types of services, forms a data unit, and stores the data in the retransmission data. In the rushing area.
  • the retransmission judging module is configured to determine whether the data unit requested to be retransmitted includes retransmission service data.
  • the data unit encapsulation module reserves the RS codeword occupied by the retransmission service data of the data unit in the retransmission data buffer, and uses the RS codeword occupied by the non-retransmission service data.
  • the new type of service data (such data that has not been sent) is replaced, and the replaced data unit is encapsulated and sent to the client device 12.
  • the resource division module may allocate an RS codeword for a certain type of service in a retransmission data unit in a static manner by using an RS codeword as a granularity, and allocate a fixed-position RS codeword in the data unit to a certain type of service, as shown in FIG. 3a.
  • the data unit includes five RS codewords, where the first two RS codewords are used to carry non-retransmission service data, and the last three RS codewords are used to carry retransmission service data.
  • the resource division module may also allocate RS codewords for a certain type of service in a retransmission data unit in a dynamic manner with the RS codeword as a granularity.
  • the location of the RS codeword is not fixed, and a certain identifier is used for distinguishing.
  • part of the data may be retransmitted, and the other part is non-retransmitted service data, or all of the data may be retransmitted or non-retransmitted.
  • the service data may also allocate resources according to a data unit (DTU) composed of multiple RS code words, as shown in FIG. 3b.
  • DTU data unit
  • the static allocation mode periodically allocate a corresponding number of integer data units to the non- Retransmit the business.
  • the dynamic allocation mode a corresponding number of integer data units are allocated for two types of services, but the location is not fixed, and a certain identifier is used for distinguishing.
  • the specific identification manner is as follows:
  • SID service flow identifier
  • the retransmission type to which the corresponding service flow identifier belongs is recorded in the system, that is, whether it is a retransmission service or a non-retransmission service.
  • bit identifier such as the 8 bits logo: ? £ « indicates retransmission service, FF « indicates non-retransmission service, or 1 bit identifier: 1 is retransmission service, 0 is non-retransmission service;
  • the data unit when resource allocation is performed with the data unit as the granularity, the data unit may not be identified, but the sender needs to record the service type to which the corresponding data unit belongs.
  • the principle of allocation of business data can be allocated according to the proportion of business traffic, polling, weights, and the like. For example, according to the proportion of the traffic flow of the retransmission service and the non-retransmission service, the corresponding number of codewords are allocated in proportion to the corresponding class of services in the data unit, and the order of the codes may be arranged according to a certain rule or arbitrarily.
  • the RS code word is used as the granularity, and the type is distinguished by the identifier.
  • the central office device 16 and the client device 12 perform capability negotiation through the management message to confirm whether the PMS-TC layer retransmission mechanism for providing service differentiation is supported. If yes, the following process is performed: as shown in FIG. 4a
  • the client device 12 receives the data unit sent by the central office device 16, the client device 12 determines whether it is necessary to request retransmission of the corresponding data unit according to whether the data of the received data unit is erroneous. If there is an error, the client device 12 sends a retransmission request message to the central office device 16, and the retransmission request message includes corresponding information of the requested retransmitted data unit; if there is no error, the retransmission request is not sent. The message is sent to the central office device 16 to continue the subsequent processing.
  • the central office device 16 After receiving the retransmission request message, the central office device 16 further determines whether it is retransmission service data according to the service category to which the data in the requested data unit DTU1 belongs.
  • the first case is shown in FIG. 5a, wherein the hatched portion indicates the RS codeword allocated for the non-retransmission service data, and when the data unit DTU1 partially includes the data RS1 and RS2 of the non-retransmission service, Data replacement is performed when the data unit is retransmitted, and the new RS-type code is used in the RS code words occupied by the non-retransmission service data RS1 and RS2 (the unsent data is replaced).
  • the data RS1, RS2, the replaced data unit DTU2 is sent to the client device 12 as the requested retransmitted data unit.
  • the central office device 16 directly directly addresses the data unit DTU1.
  • RS1-4 performs retransmission, and sends DTU2 as the requested retransmitted data unit to the client device 12, which contains all the requested codewords RS1-4.
  • the third case is as As shown in FIG.
  • Another embodiment of the present invention uses the client device 12 to determine whether the service to which the data unit belongs is retransmission service data. As shown in FIG. 6a, when the client device 12 receives the data unit sent by the central office device 16, The user equipment 12 determines whether the received data has an error. If there is no error, it does not need to send a retransmission request message to the central office device 16. If there is an error, further determine whether the service to which the data unit belongs is only To retransmit business data. When the service type is non-retransmission service, the retransmission request message is not sent to the central office device 16 to continue the subsequent processing; if some or all of the data in the data unit is retransmitted service data, then the data is sent. The request message is retransmitted to the central office device 16.
  • the central office device 16 acts as a sender. After receiving the retransmission request message, the authority device 16 further determines whether the data unit partially contains data of the non-retransmission service. If yes, retransmits the data unit. When the non-retransmission service data is replaced, the replaced data unit is sent to the client device 12; if not, the office device 16 directly retransmits the data unit.
  • the embodiment of the present invention can retransmit the retransmission service data damaged by the impulse noise by being re-transmitted by the retransmission layer located at the PMS-TC layer to retransmit the service and the non-retransmission service.
  • the non-retransmission service data is not resent. This can reduce the impact of the impulse noise on the existing DSL system/device, and further reduce the impact of the PMS-TC layer retransmission mechanism on services with high delay requirements and low bit error rate requirements, and reduce PMS-TC.
  • the additional delay caused by the layer retransmission mechanism improves the user's QoE for services with high latency and low bit error rate, reduces jitter, and improves system stability and net rate.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Telephonic Communication Services (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

一种数字用户线路的数据传输方法、装置及系统,该方法包括以下步骤: 在位于PMS-TC层的重传层,业务数据被划分成重传业务数据和非重传业务数据;分别对重传业务数据和非重传业务数据进行资源分配,并按照所分配的资源封装成数据单元;发送方发送承载业务数据的数据单元;发送方接收根据误码和重传业务类型判断后请求的承载需要重传的数据单元的信息的重传请求;发送方重传相应的数据单元, 其中承载了所请求重传的重传业务数据。 本发明不仅能够降低线路误码率,减小系统对部分数据的时延,同时也能提高 QoE。

Description

一种数字用户线路的数据传输方法、 装置及系统
本申请要求于 2009 年 4 月 9 日提交中国专利局、 申请号为 200910106640.X, 发明名称为"一种数字用户线路的数据传输方法、 装置及系 统"的中国专利申请的优先权, 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信领域, 尤其涉及一种数字用户线路的数据传输方法、装置 及系统。
背景技术
数字用户线( DSL, Digital Subscriber Line )技术是一种通过电话双绞线, 即无屏蔽双绞线进行数据传输的高速传输技术, 由于 DSL所使用的双绞线的 各线对之间是非屏蔽的, 线对间的电磁干扰会产生误码,导致线路的传输质量 下降。 现有的 DSL系统中, 通常使用纠错码来纠正 DSL线路在发送的数据中所 产生的误码, 例如交织加 RS ( Reed-Solomon )编码, 利用 RS编码额外提供 的编码增益, 削减脉冲噪声所产生的影响, 从而提高 DSL系统的稳定性。 但 是随着 DSL带宽的增大、速率的提高,使用原有的 RS编码则需要使用具有较 多的校验字节和较小长度的 RS码字, 此时, RS编码的净增益变为负值, 不 利于速率的提高。 当要求系统提供较高的脉冲噪声保护, 但要求较小的时延时, RS编码将 引入更多的冗余(即校验字节), 使得净编码增益为负值, 速率降低。 更多情 况下, 系统所提供的脉冲噪声保护(INP, Impulse Noise Protection )无法应对 脉冲噪声导致线路中的数据出现的误码现象。 当设置的噪声裕量较小时, RS 编码主要用于应对稳定噪声对 DSL系统所产生的影响(即误码)。 在这种情况 下, 系统对脉冲噪声的抵抗能力进一步削弱。 为更好的应对脉冲噪声对 DSL系统的影响,物理层的重传方案应运而生, 特另l是位于 PMS-TC层 ( Physical Media Specific Transmission Convergence sub-layer, 物理媒质特定传输汇聚子层)的重传机制。 该重传机制能够对脉冲 噪声所破坏的数据进行重新发送, 从而降低线路的误码率, 提高业务稳定性。 虽然该技术在一定程度上,缓解了脉冲噪声对系统的影响,提高了系统的业务 稳定性, 但是这种利益是建立在增加业务时延、 P争低线路净速率的基 上的。 现有的 DSL系统中, PMS-TC层无法获知其承载数据的业务类型, 且同一通 道中可能同时承载着多种业务。现有的位于 PMS-TC层的重传系统额外增加的 时延大约在 10ms以上。 对于误码率要求高、 时延要求低的业务(如视频业务 等)来说, 重传技术在用户可以忍受的时延范围内, P争低了线路误码率, 可以 提高用户的体验质量(QoE , Quality of Experience )。 但是, 网络中还存在着 对误码率要求低、 时延要求高的业务(如 VoIP等), 重传对这些业务所增加的 时延是用户所无法忍受的,极大的影响了用户的 QoE,甚至可能会导致用户投 诉。
发明内容
本发明的目的在于提供一种支持业务区分的 PMS-TC层重传的数字用户 线路的数据传输方法、 装置及系统。 本发明的技术方案:
一种数字用户线路的数据传输方法, 该方法包括以下步骤:
在位于 PMS-TC层的重传层,业务数据被划分成重传业务数据和非重传业 务数据;
对重传业务数据和非重传业务数据进行资源分配,并按照所分配的资源封 装成数据单元;
发送方发送承载业务数据的数据单元;
发送方接收根据误码和重传业务类型判断后请求的承载需要重传的数据 单元的信息的重传请求;
发送方重传相应的数据单元, 其中承载了所请求重传的重传业务数据。 一种 DSL收发器, 用于数据的发送和接收, 其特征在于包括: 业务类型划分模块, 用以将不同的业务数据划分成两类: 重传业务和非重 传业务;
重传判断模块, 用以判断被请求重传的业务数据是否包含重传业务数据, 如果不包含重传业务数据, 则不重传该业务数据;
资源划分模块, 用以在数据单元内以 RS码字为粒度, 为两类业务分配相 应数量的 RS码字, 或为两类业务分配相应数量的整数个数据单元。
一种数字用户线路的数据传输系统, 包括:
局端设备, 用于向用户端设备发送数据和接收用户端设备所发送的数据; 用户端设备,连接至所述局端设备, 用于接收所述局端设备所发送的数据 以及向局端设备发送数据,其特征在于进一步包括重传判断模块, 用以判断所 接收到的数据是否有误码,如果没有误码则不需要向局端设备发送重传请求消 息, 如果有误码时, 进一步判断该数据单元所属的业务是否为重传业务数据, 如果是非重传业务数据, 则不发送重传请求消息给局端设备,如果该数据单元 中有部分或全部数据为重传业务数据时, 则发送重传请求消息给所述局端设 备。 本发明的有益效果:本发明的实施例在位于 PMS-TC层的重传层将业务区 分为重传业务和非重传业务,该方案能够对被脉冲噪声所破坏的重传业务数据 进行重新发送, 而被破坏的非重传业务数据则不进行重新发送。这样不仅使系 统能够很好的解决脉冲噪声的影响, P争低线路误码率, 提高系统稳定性, 同时 也能提高用户的 QoE, 为用户提供更好的服务。
附图说明
图 1为本发明实施例的系统架构示意图;
图 2为本发明实施例的数字用户线接入复用器的示意图;
图 3a为本发明实施例以 RS码字为粒度进行业务划分的示意图; 图 3b为本发明实施例以数据单元为粒度进行业务划分的示意图; 图 4a为本发明第一实施例的接收方处理方法流程图;
图 4b为本发明第一实施例的发送方处理方法流程图;
图 5a-c为本发明第一实施例的三种数据重传方法示意图;
图 6a为本发明第二实施例的接收方处理方法流程图; 图 6b为本发明第二实施例的发送方处理方法流程图。
具体实施方式
如图 1所示, 本发明实施例的数字用户线路的数据传输系统, 包括: 用户 端设备 12以及局端设备 16, 用户端设备 12通常为数字用户线调制解调器, 也可以是其它形式的 DSL收发器, 其与局端设备 16链接, 用户端设备 12可 以向局端设备 16发送数据, 同时也可以接收和处理局端设备 16发出的数据。 其进一步包括包括包括壳体、发送单元和接收单元, 所述发送单元及接收单元 设置在壳体内, 用于数据的发送和接收。 局端设备 16具体为数字用户线接入 复用器(DSLAM, Digital Subscriber Line Access Multiplexer )或其它形式的 DSL 收发器, 数字用户线接入复用器也包括壳体、 发送单元以及接收单元, 所述发送单元及接收单元设置在壳体内, 用于数据的发送和接收。
在本实施例中仅以局端设备 16作为发送方,用户端设备 12作为接收方为 例来进行说明, 实际上用户端设备 12也可以作为发送方,局端设备 16作为接 收方。
如图 2所示,局端设备 16进一步包含业务类型划分模块、 资源划分模块、 数据单元封装模块以及重传判断模块。 其中, 业务类型划分模块用以在位于 PMS-TC层的重传层, 按照不同的时延和 /或误码率要求, 将不同的业务数据 划分成两类:重传业务和非重传业务,并分别存储在两个不同的数据缓冲区中。 资源划分模块在数据单元内以 RS码字为粒度, 为两类业务分配相应数量的 RS码字, 并在数据单元内对两类业务数据分别进行标识, 以区分其所属业务 类型, 即是否是重传业务。数据单元封装模块按照资源分配模块为两类业务所 分配的资源进行相应数据的填充,形成数据单元, 并将数据存放在重传数据缓 冲区中。 重传判断模块用以判断所请求重传的数据单元是否包含重传业务数 据。 当包含重传业务数据时,数据单元封装模块将该重传数据缓冲区中的数据 单元的重传业务数据所占用的 RS码字保留, 并将非重传业务数据所占用的 RS码字用新的该类业务数据(未发送过的该类数据)替换, 将替换后的数据 单元封装后发给用户端设备 12。
资源划分模块可以采用静态方式以 RS码字为粒度在重传数据单元中为某 类业务分配 RS码字,将数据单元中固定位置的 RS码字分配给某类业务使用, 如图 3a所示, 数据单元中包含 5个 RS码字, 其中前两个 RS码字用于承载非 重传业务数据, 后面三个 RS码字用于承载重传业务数据。 资源划分模块也可 以采用动态方式以 RS码字为粒度在重传数据单元中为某类业务分配 RS码字, RS码字的位置不固定, 使用一定的标识进行区分。 这样, 一个数据单元中, 可以部分为重传业务数据, 另外一部分为非重传业务数据,也可以全部都是重 传业务数据或非重传业务数据。
当然, 业务数据还可以按照由多个 RS码字组成的数据单元(DTU )为粒 度进行资源分配, 如图 3b所示, 静态分配方式下, 周期性的分配相应数量的 整数个数据单元给非重传业务。动态分配方式下, 为两类业务分配相应数量的 整数个数据单元, 但其位置不固定, 使用一定的标识进行区分, 具体的标识方 式如下:
1 )使用业务流标识(SID ), 根据业务流标识判断是否是重传业务, 此时 需要在系统中记录相应业务流标识所属的重传类型, 即是重传业务,还是非重 传业务。
或 2 )使用 bit标识, 如 8 bits标识: ?£«表示重传业务, FF«表示非重传 业务, 或 1 bit标识: 1为重传业务, 0为非重传业务;
另外, 当以数据单元为粒度进行资源分配时,也可以不对数据单元进行标 识, 但在发送方需要记录相应数据单元所属的业务类型。 业务数据的分配原则可以按照业务流量比例、轮询、权重等方式进行分配。 如按照重传业务和非重传业务的照业务流量比例分配,在数据单元内为相应类 的业务按照比例分配相应数量的码字,其排列顺序可按照一定的规则,或是任 意排列。 当一个数据单元中包含两类业务数据时, 以 RS码字为粒度, 通过标 识进行类型区分。
本发明实施例之一的具体方法如下:
在系统初始化阶段,局端设备 16和用户端设备 12通过管理消息进行能力 协商,确认是否支持提供业务区分的 PMS-TC层重传机制,如果是则按照如下 流程进行操作: 如图 4a所示, 当用户端设备 12接收到局端设备 16所发送的 数据单元时, 用户端设备 12根据所接收到数据单元的数据是否有误码, 判断 是否需要对相应的数据单元请求重传。 如有误码, 则用户端设备 12发送重传 请求消息给局端设备 16, 重传请求消息中包含了所请求重传的数据单元的相 应信息; 如没有误码, 则不发送重传请求消息给局端设备 16, 继续进行后续 的处理。
如图 4b所示,局端设备 16在接收到重传请求消息后,根据所请求数据单 元 DTU1中数据所属的业务类别进一步判断是否是重传业务数据。第一种情况 如图 5a所示, 其中加斜线部分表示为非重传业务业务数据所分配的 RS码字, 当该数据单元 DTU1中部分包含非重传业务的数据 RS1、 RS2时, 则对该数据 单元进行重新发送时进行数据替换, 非重传业务数据 RS1、 RS2所占用的 RS 码字中使用新的该类业务数据 RS5、 RS6 (未发送过的该类数据 )替换原有的 数据 RS1、 RS2, 将替换后的数据单元 DTU2作为所请求重传的数据单元发送 给用户端设备 12。 第二种情况如图 5b所示, 如果该数据单元 DTU1中的 4个 码字 RS1-4全部为重传业务数据, 不包括非重传业务数据, 则局端设备 16直 接对该数据单元 DTU1的 RS1-4进行重传, 将 DTU2作为所请求重传的数据 单元发送给用户端设备 12,里面包含所请求的全部码字 RSl-4。第三种情况如 图 5c所示, 如果该数据单元 DTU1中的全部码字 RS1-4全部是非重传业务数 据, 则直接忽略该数据单元的重传请求消息, 局端设备 16发送的 DTU2中不 包含码字 RSl-4。
本发明的另外一个实施例采用用户端设备 12来判断该数据单元所属的业 务是否为重传业务数据, 如图 6a所示, 当用户端设备 12接收到局端设备 16 所发送的数据单元时, 用户端设备 12判断所接收到的数据是否有误码, 如果 没有误码则不需要向局端设备 16发送重传请求消息, 如果有误码时, 进一步 判断该数据单元所属的业务是否仅为重传业务数据。当所属的业务类型为非重 传业务时, 则不发送重传请求消息给局端设备 16, 继续进行后续的处理; 如 果该数据单元中有部分或全部数据为重传业务数据时,则发送重传请求消息给 局端设备 16。
如图 6b所示, 局端设备 16作为发送方, 当局端设备 16接收到重传请求 消息后, 进一步判断该数据单元是否部分包含非重传业务的数据, 如果是, 则 重新发送该数据单元时对非重传业务数据替换,将替换后的数据单元发送给用 户端设备 12; 如果否, 则局端设备 16直接对该数据单元进行重传。
本发明的实施例通过在位于 PMS-TC层的重传层将业务区分为重传业务 和非重传业务, 发送方能够对被脉冲噪声所破坏的重传业务数据进行重新发 送, 而被破坏的非重传业务数据则不进行重新发送。这样可以在解决脉冲噪声 对现有 DSL系统 /设备影响的同时, 进一步减小 PMS-TC层重传机制对时延要 求高、误码率要求低的业务所产生的影响,减小 PMS-TC层重传机制所产生的 额外时延, 提高用户对时延要求高、 误码率要求低的业务的 QoE, 减小抖动, 提高系统稳定性和净速率。 以上是对本发明具体实施例的说明,在具体的实施过程中本领域的普通技 术人员可以对本发明的方案进行适当的改进和变更, 以适应具体情况的需要。 因此,本发明的具体实施方式只是起示范作用, 并不用以限制本发明的保护范 围。

Claims

权 利 要 求
1、 一种数字用户线路的数据传输方法, 该方法包括以下步骤:
在位于 PMS-TC物理媒质特定传输汇聚子层的重传层,业务数据被划分成 重传业务数据和非重传业务数据;
分别对重传业务数据和非重传业务数据进行资源分配,并按照所分配的资 源封装成数据单元;
发送方发送承载业务数据的数据单元;
发送方接收根据误码和重传业务类型判断后请求的承载需要重传的数据 单元的信息的重传请求;
发送方重传相应的数据单元, 其中承载了所请求重传的重传业务数据。
2、 根据权利要求 1所述的方法, 其特征在于, 所述的资源分配的粒度为 由多个 RS码字组成的数据单元或者是数据单元内的 RS码字。
3、 根据权利要求 1所述的方法, 其特征在于, 所述的发送方重传相应的 数据单元之前,进一步包括: 发送方对所请求重传的数据单元中的非重传业务 数据进行替换, 形成新的数据单元, 并进行重传。
4、 根据权利要求 2所述的方法, 其特征在于, 所述的资源分配的方式具 体为:
静态方式, 将数据单元中固定位置的 RS码字分配给某类业务使用, 或周 期性的分配相应数量的 RS码字或是数据单元供某类业务使用;
或动态方式, 包含按照流量比例、轮询或权重的方式为两类业务分配相应 数量的码字或数据单元。
5、 根据权利要求 4所述的方法, 其特征在于, 在资源分配后进一步包括 标识的步骤, 标识的方法具体为:
1 )使用业务流标识, 根据业务流标识判断是否是重传业务, 在系统中记 录相应业务流标识所属的重传类型, 即是重传业务, 还是非重传业务; 或 2 )使用 bit标识, 8 bits标识: FE«表示重传业务, FF«表示非重传业 务, 或 l bit标识: 1为重传业务, 0为非重传业务。
6、根据权利要求 4所述的方法, 其特征在于, 在资源分配后进一步包括: 在发送方记录相应数据单元所属的业务类型是否为重传业务。
7、 一种数字用户线路的数据传输方法, 该方法包括以下步骤:
在位于 PMS-TC层的重传层,业务数据被划分成重传业务数据和非重传业 务数据;
分别对重传业务数据和非重传业务数据进行资源分配,并按照所分配的资 源封装成数据单元;
发送方发送承载业务数据的数据单元;
发送方接收根据误码判断后请求的承载需要重传的数据单元的信息的重 传请求;
发送方进一步判断所请求重传的数据单元中的业务数据是否含有重传业 务数据, 如果是, 则发送方重传相应的数据单元, 其中承载了所请求重传的重 传业务数据。
8、 根据权利要求 7所述的方法, 其特征在于, 所述的资源分配的粒度为 由多个 RS码字组成的数据单元或者是数据单元内的 RS码字。
9、 根据权利要求 8所述的方法, 其特征在于, 所述的资源分配的方式具 体为:
静态方式, 将数据单元中固定位置的 RS码字分配给某类业务使用, 或周 期性的分配相应数量的 RS码字或是数据单元供某类业务使用, 并进行相应的 标识;
或动态方式, 包含按照流量比例、轮询或权重的方式为两类业务分配相应 数量的码字或数据单元, 并进行相应的标识。
10、 一种 DSL收发器, 用于数据的发送和接收, 其特征在于包括: 业务类型划分模块, 用以将不同的业务数据划分成两类: 重传业务和非重 传业务;
重传判断模块, 用以判断被请求重传的业务数据是否包含重传业务数据, 如果不包含重传业务数据, 则不重传该业务数据;
资源划分模块, 用以在数据单元内以 RS码字为粒度, 为两类业务分配相 应数量的 RS码字, 或为两类业务分配相应数量的整数个数据单元。
11、 根据权利要求 10所述的 DSL收发器, 其特征在于进一步包括: 数据 单元封装模块,按照资源划分模块为两类业务所分配的资源进行相应的数据填 充, 形成数据单元。
12、 一种 DSL收发器, 用于数据的发送和接收, 其特征在于包括: 重传 判断模块, 用以判断所接收到的数据是否有误码,如果没有误码则不需要发送 重传请求消息,如果有误码, 则进一步判断该数据单元所属的业务是否为重传 业务数据, 如果是非重传业务数据, 则不发送重传请求消息, 如果该数据单元 中有部分或全部数据为重传业务数据时, 则发送重传请求消息。
13、 一种数字用户线路的数据传输系统, 包括:
局端设备, 用于向用户端设备发送数据和接收用户端设备所发送的数据; 用户端设备,连接至所述局端设备, 用于接收所述局端设备所发送的数据 以及向局端设备发送数据,其特征在于进一步包括重传判断模块, 用以判断所 接收到的数据是否有误码,如果没有误码则不需要向局端设备发送重传请求消 息, 如果有误码时, 进一步判断该数据单元所属的业务是否为重传业务数据, 如果是非重传业务数据, 则不发送重传请求消息给局端设备,如果该数据单元 中有部分或全部数据为重传业务数据时, 则发送重传请求消息给所述局端设 备。
14、 根据权利要求 13所述的系统, 其特征在于, 所述局端设备为数字用 户线接入复用器 DSLAM, 所述用户端设备为数字用户线调制解调器。
15、 根据权利要求 13所述的系统, 其特征在于, 所述局端设备进一步包 括: 业务类型划分模块, 用以按照不同的时延和 /或误码率要求将不同的业务 数据划分成重传业务和非重传业务。
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