WO2012106946A1 - 一种可变速率信号的处理方法、装置及系统 - Google Patents

一种可变速率信号的处理方法、装置及系统 Download PDF

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Publication number
WO2012106946A1
WO2012106946A1 PCT/CN2011/078477 CN2011078477W WO2012106946A1 WO 2012106946 A1 WO2012106946 A1 WO 2012106946A1 CN 2011078477 W CN2011078477 W CN 2011078477W WO 2012106946 A1 WO2012106946 A1 WO 2012106946A1
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signal
elastic
otu
odu
signals
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PCT/CN2011/078477
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English (en)
French (fr)
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操时宜
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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 ES11858184.2T priority Critical patent/ES2599853T3/es
Priority to PCT/CN2011/078477 priority patent/WO2012106946A1/zh
Priority to CN201180001547.8A priority patent/CN102349310B/zh
Priority to EP11858184.2A priority patent/EP2733880B1/en
Priority to ES16182332T priority patent/ES2951886T3/es
Priority to EP16182332.3A priority patent/EP3151453B1/en
Publication of WO2012106946A1 publication Critical patent/WO2012106946A1/zh
Priority to US14/180,066 priority patent/US9450889B2/en
Priority to US15/265,348 priority patent/US10090960B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1605—Fixed allocated frame structures
    • H04J3/1652—Optical Transport Network [OTN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2589—Bidirectional transmission
    • H04B10/25891—Transmission components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/826—Involving periods of time

Definitions

  • the present invention relates to the field of communications technologies, and more particularly to a method, apparatus, and system for processing a variable rate signal.
  • WDM Widelength Division In a multiplexing, wavelength division multiplexing network
  • the line rate becomes higher and higher, the signal spectrum becomes wider and wider.
  • the spectral width of a 400G signal will exceed 50 GHz, and now the OADM in the WDM network (Optical) Add/Drop Multiplexer, ROADM (Reconfiguration Optical Add/Drop) Multiplexers, dynamic optical add/drop multiplexers are mostly set at intervals of 50 GHz. Therefore, it is generally believed that 400G and higher rate signals will not pass through the OADM or ROADM in the live network.
  • OADM or ROADM can use Flex Grid technology.
  • Flex Grid technology also known as SLICE or variable bandwidth network
  • the main core is to fix the current fixed spectrum grid (or wavelength interval, see ITU-T). G.694), modified into an elastic spectrum grid, that is, one signal can occupy multiple consecutive spectrum grids.
  • OADM or ROADM is using Flex After the Grid technology, in order to further improve the efficiency of fiber spectrum utilization, a variable rate/spectral width variable optical module (Transponder) is adopted.
  • Transponder Orthogonal Frequency Division
  • the optical module can adjust the number of OFDM subcarriers according to the bandwidth of the client side to adjust the spectrum size of the line signal, and combine the control plane technology to improve the spectrum utilization.
  • OTN Optical Transport Network
  • OTUk Optical Channel Transport
  • OTU / ODU (H) Optical channel Data Unit (High) Order
  • high-order optical channel data unit) overhead see standard ITU-T G.709
  • An aspect of the present invention provides a method for processing a variable rate signal, the method comprising:
  • n ODU signals Encapsulating the n ODU signals into an elastic optical channel transmission unit OTU signal, wherein a nominal bit rate of the elastic OTU signal changes with an value of n, where n is greater than or equal to Integer.
  • the present invention also provides a processing device (1) for a variable rate signal, the device comprising:
  • An ODU encapsulation module configured to encapsulate a signal from a client side into n optical channel data unit ODU signals;
  • An elastic OTU encapsulating module configured to encapsulate the n ODU signals into an elastic optical channel transmission unit OTU signal, where a nominal bit rate of the elastic OTU signal changes according to an n value, Let n be an integer greater than or equal to 1.
  • Another aspect of the present invention provides a method of processing a variable rate signal, the method comprising:
  • n ODU signals After decapsulating an elastic OTU signal, generating n ODU signals; a nominal bit rate of the elastic OTU signal changes with an value of n, the n being an integer greater than or equal to 1;
  • ODU signals are decapsulated to generate a signal that is sent to the client side.
  • Another aspect of the present invention provides a processing device (2) for a variable rate signal, the device comprising:
  • An elastic OTU decapsulation module configured to decapsulate an elastic OTU signal to generate n ODU signals; a nominal bit rate of the elastic OTU signal changes according to an n value, where n is greater than or equal to 1 Integer
  • the ODU decapsulation module is configured to decapsulate the n ODU signals to generate a signal sent to the client side.
  • the present invention proposes a processing system for a variable rate signal, comprising a processing device (a) of a variable rate signal as described above and a processing device (2) for a variable rate signal.
  • the present invention encapsulates signals from the client side into n optical channel data unit ODU signals; and encapsulates the n ODU signals into an elastic optical channel transmission unit OTU signal.
  • the nominal bit rate of the elastic OTU signal changes with an value of n, which is an integer greater than or equal to 1.
  • the packaging of the variable rate signal is realized. By packaging the variable rate signal in the elastic OTU signal, the variable bandwidth network requirement can be adapted, the line encapsulation efficiency is improved, the line bit rate is reduced, and the transmission performance is improved.
  • FIG. 1 is a flowchart of a method for processing a variable rate signal according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of an application scenario according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of another method for processing a variable rate signal according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a processing apparatus for a variable rate signal according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of another apparatus for processing a variable rate signal according to an embodiment of the present invention.
  • the present invention provides a method, apparatus and system for processing a variable rate signal, which encapsulates a signal from a client side into n ODU signals; and encapsulates the ODU signal into an elastic OTU (OTUflex) signal,
  • the nominal bit rate of the elastic OTU signal varies with the value of n, which is an integer greater than or equal to one.
  • an embodiment of the present invention provides an OTU container for packaging a variable rate signal, which implements encapsulation of a variable rate signal, and can adapt to a variable bandwidth by encapsulating a variable rate signal in an elastic OTU signal.
  • Network requirements improve line packaging efficiency, reduce line bit rate, and improve transmission performance.
  • an embodiment of the present invention provides a method for processing a variable rate signal by using a line sending direction as an application scenario, and the method includes:
  • n ODU signals into an elastic optical channel transmission unit OTU signal, where a nominal bit rate of the elastic OTU signal changes according to an n value, where n is an integer greater than or equal to 1.
  • the signal from the client side in the embodiment of the present invention may be IP (Internet) Protocol, Internet Protocol) Service, TDM (Time Division) Multiplexing, time division multiplexing, etc.
  • IP Internet
  • Internet Protocol Internet Protocol
  • TDM Time Division Multiplexing
  • n ODU signals
  • the received signal from the client side may also be processed correspondingly, for example, performing Layer 2 forwarding, traffic monitoring, etc. on the signal from the client side. ;
  • the traffic information is extracted from the signal from the client side, and the flow control information is further determined according to the traffic information of the signal from the client side;
  • the manner of determining the flow control information may be determined by using a predetermined management/control plane mechanism to interact with the server or other nodes, and the constraints of the network and link resources need to be considered in the process. For example: can be passed through GMPLS ((Generalized Multiprotocol Label Switching), general multi-protocol label switching protocol, etc.
  • GMPLS Generalized Multiprotocol Label Switching
  • general multi-protocol label switching protocol etc.
  • the method further includes:
  • a signal from the client side that satisfies the flow control requirement is encapsulated into the n ODU signals; a signal from the client side that does not satisfy the flow control requirement is buffered.
  • the method further includes:
  • the number n of ODU signals is determined based on signal flow information from the client side.
  • the specific process includes:
  • n is chosen such that the n ODU nominal bit rates are added greater than the allowed signal traffic from the client side, and the n-1 ODU nominal bit rates are added less than the allowed signal traffic from the client side, wherein the allowed The signal flow on the customer side is determined by the signal flow control information from the client side.
  • the ODU signal type can be set by a pre-configured manner; the existing ITU-T
  • the types of ODU signals defined in the G.709 standard include: ODU0, ODU1, ODU2, ODU3, ODU4, and ODUflex, and one of these types can be selected for configuration. It is obvious that other types of ODU signals that may be newly defined, such as ODU5, etc., may be used, and the ODU signal type is not specifically limited in the embodiment of the present invention.
  • the specific method for the step 101 to encapsulate the signal from the client side into the n ODU signals is implemented by using an existing method.
  • an existing method For details, refer to the ITU-T. A description of the G.709 standard.
  • step 102 encapsulates the n ODU signals into an elastic OTU signal, and may be implemented in any of the following three manners:
  • an elastic ODU (ODUflex) can be encapsulated into an OTUflex signal: where the elastic ODU signal is a specific ODU signal, which is in ITU-T. Defined in the G.709 standard;
  • n identical ODU signals of the same type can be encapsulated into an OTUflex signal, where n is an integer greater than one:
  • n different types of ODU signals can be encapsulated into an OTUflex signal, where n is an integer greater than one.
  • the signal from the client side can be directly encapsulated into an elastic ODU signal, and then directly encapsulated into an OTUflex signal; without requiring an elastic ODU signal.
  • Encapsulated into a fixed number of OTU signals; the process of packaging the signal from the client side into an elastic ODU signal and the process of directly encapsulating an elastic ODU signal into an OTUflex signal can refer to ITU-T The G.709 standard simple class was introduced.
  • multiple low-rate ODUk of the same type (L, Low Order,
  • the low-order signal is encapsulated into an OTUflex signal: where k in the ODUk (Optical Channel Data Unit-k) represents the rate class, in the existing ITU-T 0, 1, 2, 3, 4 are defined in the G.709 standard.
  • the specific packaging method can be introduced with reference to the ITU-T G.709 standard simple class.
  • the OTUflex can be packaged into the ODU(L) whose number can be continuously changed, and the corresponding nominal bit rate is different when the number of ODU(L) of the package is different.
  • the OTU signal in the existing standard can only be encapsulated into a fixed number of combined ODUs.
  • OTU2 can be packaged into 8 ODU0s.
  • a large amount of padding is required to package a continuously changing number of ODUs (L), such as encapsulation into 8 ODU0s.
  • Encapsulating 6 ODU0s uses the same OTU2 signal with the same nominal bit rate.
  • r, s, t are integers greater than or equal to zero.
  • the figure shows an example of encapsulating multiple ODU0, ODU1, and ODU2 into one OTUflex signal (other types of ODUs can also be used); where ODU0, ODU1, and ODU2 are standard ITU-T ODU type defined in G.709; OPUflex (flexible optical channel Payload Unit) is a standard ITU-T The OPU type defined in G.709; the specific implementation method of encapsulating multiple different types of ODU(L) into an OTUflex can be simply inferred from the method of encapsulating multiple ODU(L) of the same type into an OTUflex. It is concluded that it will not be detailed.
  • the method may further include:
  • a transmission clock of the OCh signal a modulation baud rate, a modulation pattern, and a signal spectrum position
  • the OCh signal is transmitted according to the determined information.
  • the specific manner of determining the foregoing information includes: according to the traffic situation, the spectrum resource condition in the optical fiber, the transmission distance, and the like, and combining the traffic information of the signal from the client side, selecting the elasticity that can be transmitted.
  • the OTU corresponds to the nominal bit rate and/or the actual bit rate, and then selects the transmit clock, modulation baud rate, modulation pattern, and signal spectral position of the OCh signal.
  • the embodiment of the present invention uses a line receiving direction as an application scenario to describe a specific process of a variable rate signal processing method:
  • n ODU signals After decapsulating an elastic OTU signal, generating n ODU signals; a nominal bit rate of the elastic OTU signal changes according to an n value, where n is an integer greater than or equal to 1;
  • step 501 may include:
  • n ODU signals After decapsulating an elastic OTU signal, generating n ODU signals of the same type, where n is greater than 1: or,
  • n is greater than one.
  • the method may further include:
  • the OCh signal is received according to one or more of a modulation baud rate, a modulation pattern, and a signal spectral position of the OCh signal.
  • the decapsulation method in step 501 of the embodiment of the present invention is the inverse process of the encapsulation method in step 102 of the embodiment of FIG. 1.
  • n ODU signals are decapsulated and generated and sent to the client side.
  • the process of the signal is the reverse process of the encapsulation method in the step 101 in the embodiment of FIG. 1.
  • the specific solution can be directly derived from the encapsulation method described in the embodiment of FIG. 1, and details are not described herein.
  • an embodiment of the present invention provides a processing device for a variable rate signal, where the line sending direction is used as an application scenario, and the device may include:
  • the ODU encapsulation module 61 is configured to encapsulate the signal from the client side into the n optical channel data unit ODU signals;
  • An elastic OTU encapsulating module 62 configured to encapsulate the n ODU signals into an elastic optical channel transmission unit OTU signal; a nominal bit rate of the elastic OTU signal changes according to an n value, n is an integer greater than or equal to 1.
  • the elastic OTU package module encapsulates the ODU signal by any one of the following methods:
  • ODU signals Multiple different types are encapsulated into an elastic OTU signal.
  • the processing device further includes:
  • the bandwidth controller 63 is configured to determine the number n of optical channel data unit ODU signals according to the traffic information of the signal from the client side.
  • the bandwidth controller is further configured to:
  • a transmission clock of the OCh signal a modulation baud rate, a modulation pattern, and a signal spectrum position
  • the processing device further includes:
  • the variable rate sending module 64 is configured to perform electro-optical conversion on the one elastic OTU signal to generate an optical channel OCh signal, and send the OCh signal according to the information determined by the bandwidth controller.
  • the bandwidth controller is further configured to:
  • the processing device further includes:
  • the client signal processing module 65 is configured to determine, according to the flow control information, whether the signal from the client side meets a flow control requirement, and encapsulate a side signal from the client that meets the flow control requirement to the n ODUs In the signal, the signal from the client side that does not satisfy the flow control requirement is buffered.
  • the embodiment of the present invention provides a processing device for a variable rate signal, where the line receiving direction is used as an application scenario, and the device may include:
  • the elastic OTU decapsulation module 71 is configured to decapsulate an elastic OTU signal to generate n ODU signals; the nominal bit rate of the elastic OTU signal changes according to the value of n, where n is greater than or equal to An integer of 1;
  • the ODU decapsulation module 72 is configured to decapsulate the n ODU signals to generate a signal sent to the client side.
  • the elastic OTU decapsulation module decapsulates the elastic OTU signal by any one of the following schemes:
  • An elastic OTU signal is decapsulated into n different types of ODU signals, where n is greater than one.
  • the device further includes:
  • the variable rate receiving module 73 is configured to acquire an OCh signal from the line side, and receive the OCh according to one or more information of a modulation baud rate, a modulation pattern, and a signal spectrum position of the OCh signal. signal.
  • the bandwidth controller 74 is configured to control the variable rate receiving module to receive the OCh signal according to one or more of a modulation baud rate, a modulation pattern, and a signal spectrum position of the OCh signal.
  • the bandwidth controller may further control the elastic OTU decapsulation module or the ODU decapsulation according to one or more information of a modulation baud rate, a modulation pattern, and a signal spectrum position of the OCh signal.
  • the module or client signal processing module performs the corresponding processing of the corresponding modules described in the embodiments of the present invention.
  • the bandwidth controller may also adopt a predetermined management/control plane mechanism (for example, may be implemented by GMPLS, etc.) and a server or other according to information such as processing capability fed back by the client signal processing module.
  • a predetermined management/control plane mechanism for example, may be implemented by GMPLS, etc.
  • server or other for example, may be implemented by GMPLS, etc.
  • the manner in which the nodes interact to determine the flow control information in the direction of the transmission is, for example, based on the embodiment of FIG. 1 or based on the flow control information described in the embodiment of FIG.
  • the client signal processing module 75 is mainly configured to generate a signal sent to the client side by decapsulating the ODU decapsulation module, and send the signal to the client side.
  • the processing device is a device right obtained directly by the processing method according to the embodiment of FIG. 5, and includes the same or corresponding technical solution as the embodiment of FIG. 5, which is not involved herein. The technical solution is elaborated.
  • the embodiment of the invention further provides a processing system for a variable rate signal,
  • the processing device as described in the embodiment of FIG. 6 and the processing device as described in FIG. 7 are included:
  • the processing system in the embodiment of the present invention includes the processing device in the embodiment of FIG. 6 and FIG. 7.
  • the specific technical solution refer to the description in the related embodiments, and details are not described herein.
  • the implementation of the technical solution of the embodiment of the present invention can adapt to the requirements of the variable bandwidth network, can improve the signal line encapsulation efficiency, reduce the line bit rate, and improve the transmission performance.
  • the storage medium may be a magnetic disk, an optical disk, or a read-only storage memory (Read-Only) Memory, ROM) or Random Access Memory (RAM).

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Abstract

本发明涉及一种可变速率信号的处理方法、装置及系统，该方法包括：将来自客户侧的信号封装到n个光信道数据单元ODU信号中；将所述n个ODU信号，封装进一个弹性的光信道传送单元OTU信号中，其中，所述弹性OTU信号的标称比特率随着n值的不同而变化，所述n为大于等于1的整数。本发明技术方案的实现，能适应可变带宽网络的需求，提高线路封装效率。

Description

一种可变速率信号的处理方法、装置及系统
技术领域
本发明涉及通信技术领域，更具体的说，涉及一种可变速率信号的处理方法、装置及系统。
发明背景
目前，在WDM（Wavelength Division Multiplexing，波分复用）网络中，随着线路速率越来越高，信号频谱越来越宽。例如，一般预计400G信号的谱宽就将超过50GHz，而现在WDM网络中的OADM（Optical Add/Drop Multiplexer，光分插复用器）或ROADM（Reconfiguration Optical Add/Drop Multiplexer，动态光分插复用器）很多都是按照频谱50GHz的间隔设置的。因此，一般认为400G及更高速率信号将无法穿过现网中的OADM或ROADM。
为解决上述问题，OADM或ROADM均可使用Flex Grid技术。Flex Grid技术（也称为SLICE或可变带宽网络）已成为业界研究热点，主要核心是将当前固定的频谱栅格（或波长间隔，参见ITU－T G.694），修改成弹性的频谱栅格，即一路信号可以占用多个连续的频谱栅格。
OADM或ROADM在使用了Flex Grid技术之后，为了进一步提高光纤频谱利用效率，采用了可变速率/谱宽可变的光模块（Transponder）。以支持OFDM（Orthogonal Frequency Division Multiplexing，正交频分复用技术）为例，光模块可以根据客户侧带宽大小，调整OFDM子载波数量，来调整线路信号频谱大小，并结合控制平面技术，从而达到提高频谱利用率的效果。
但在OTN（Optical Transport Network，光传送网，参见ITU-T G.709标准）层如何封装客户信号，也就是说，如何实现速率可变的OTN信号是要解决的重要问题。
现有方案中是通过将OTUk（Optical Channel Transport Unit-k，光信道传送单元k，其中，k代表速率等级，k=1,2,3,4，…）调制到一个子载波上，也就是说，对于一路OFDM信号，其数据帧格式为n×OTUk（n表示子载波数量，为大于等于1的整数）。
现有方案存在一些问题，举例而言：
采用现有方案会有n个OTU /ODU（H）（Optical channel Data Unit（High Order），高阶光信道数据单元)开销（参见标准ITU-T G.709），这样在管理平面，需要选择一个OTU/ODU（H）为有效开销，在中间节点，还需要将有效的开销搬移到节点指定的OTU/ODU（H）中，这些处理都会增加管理和控制平面设计的复杂度，从而增加管理和控制的难度。此外，如果只选择一个OTU/ODU(H)有效开销，其他N－1个OTU/ODU(H)开销就为无效字节，因此会浪费带宽，降低带宽利用率。
发明内容
本发明的目的是提供一种可变速率信号的处理方法、装置及系统，能够实现OTN层可变速率信号的封装。
本发明的技术方案如下：
本发明一方面提供了一种可变速率信号的处理方法，所述方法包括：
将来自客户侧的信号封装到n个光信道数据单元ODU信号中；
将所述n个ODU信号，封装进一个弹性的光信道传送单元OTU信号中，其中，所述弹性OTU信号的标称比特率随着n值的不同而改变，所述n为大于等于1的整数。
本发明还提供了一种可变速率信号的处理设备（一），所述设备包括：
ODU封装模块，用于将来自客户侧的信号封装到n个光信道数据单元ODU信号中；
弹性OTU封装模块，用于将所述n个ODU信号，封装进一个弹性的光信道传送单元OTU信号中，其中，所述弹性OTU信号的标称比特率随着n值的不同而改变，所述n为大于等于1的整数。
本发明另一方面提供了一种可变速率信号的处理方法，所述方法包括：
将一个弹性的OTU信号解封装后，生成n个ODU信号；所述弹性的OTU信号的标称比特率随着n值的不同而改变，所述n为大于等于1的整数；
将所述n个ODU信号解封装生成发送给客户侧的信号。
本发明另一方面还提供了一种可变速率信号的处理设备（二），所述设备包括：
弹性OTU解封装模块，用于将一个弹性的OTU信号解封装后，生成n个ODU信号；所述弹性OTU信号的标称比特率随着n值的不同而改变，所述n为大于等于1的整数；
ODU解封装模块，用于将所述n个ODU信号解封装生成发送给客户侧的信号。
本发明提出了一种可变速率信号的处理系统，包括如上所述的一种可变速率信号的处理设备（一）以及一种可变速率信号的处理设备（二）。
基于上述本发明技术方案可以看出，本发明通过将来自客户侧的信号封装到n个光信道数据单元ODU信号中；将所述n个ODU信号，封装进一个弹性的光信道传送单元OTU信号中，所述弹性OTU信号的标称比特率随着n值的不同而改变，所述n为大于等于1的整数。实现了可变速率信号的封装，通过将可变速率信号封装在弹性OTU信号中，能够适应可变带宽网络需求，提高线路封装效率，减低线路比特率，提升传输性能。
附图简要说明
图1为本发明实施例一种可变速率信号的处理方法流程图；
图2为本发明实施例的应用场景图；
图3为本发明实施例的应用场景图；
图4为本发明实施例的应用场景图；
图5为本发明实施例另一种可变速率信号的处理方法流程图；
图6为本发明实施例一种可变速率信号的处理设备结构示意图；
图7为本发明实施例另一种可变速率信号的处理设备结构示意图。
实施本发明的方式
本发明提供了一种可变速率信号的处理方法、装置及系统，将来自客户侧的信号封装到n个ODU信号中；将所述ODU信号封装进一个弹性OTU（OTUflex）信号中，所述弹性OTU信号的标称比特率随着n值的不同而改变，所述n为大于等于1的整数。
通过上述技术方案可知，本发明实施例提供了一种封装可变速率信号的OTU容器，实现了可变速率信号的封装，通过将可变速率信号封装在弹性OTU信号中，能够适应可变带宽网络需求，提高线路封装效率，减低线路比特率，提升传输性能。
需要说明的是，本实施例中采用的术语“包括”规定了所述的特征、整体、步骤、操作、元件和/或部件的存在，而不排除一个或多个其他特征、整体、步骤、操作、元件、部件和/或它们的组的存在或附加。
本发明实施例中，分别以线路发送方向与线路接收方向两个方向作为应用场景，对本发明的技术方案进行详细说明。
如图1所示，本发明实施例以线路发送方向作为应用场景，提出一种可变速率信号的处理方法，该方法包括：
101、将来自客户侧的信号封装到n个光信道数据单元ODU信号中；
102、将n个ODU信号，封装进一个弹性的光信道传送单元OTU信号中；其中，所述弹性OTU信号的标称比特率随着n值不同而改变，所述n为大于等于1的整数。
具体的说，本发明实施例中来自客户侧的信号可以为IP（Internet Protocol，互联网协议）业务、TDM（Time Division Multiplexing，时分复用）业务等，这些来自客户侧的信号封装进ODU信号之前，可以是经过处理的，也可以是没有经过处理的。针对没有经过处理的来自客户侧的信号，可以直接封装到n个ODU信号中，在这种情况下，n的值可以是直接配置的。
可选的，在接收到所述来自客户侧的信号时，还可以对接收到的来自客户侧的信号进行相应的处理，例如：对所述来自客户侧的信号进行二层转发、流量监控等；
其中，在流量监控的过程中，从来自客户侧的信号中提取出流量信息，根据来自客户侧的信号的流量信息进一步确定流量控制信息；
流量控制信息的确定方式，具体可以采用预定的管理/控制平面机制与服务器或其他节点交互的方式来确定，该过程中需要考虑网络和链路资源的约束。例如：可以通过GMPLS（(Generalized Multiprotocol Label Switching)，通用多协议标志交换协议）等来实现。
在本发明的一个可选实施例中，所述方法还包括：
根据所述来自客户侧信号的流量信息确定流量控制信息；
根据所述流量控制信息确定所述来自客户侧的信号是否满足流量控制要求；
将满足所述流量控制要求的来自客户侧的信号，封装到所述n个ODU信号中；将不满足所述流量控制要求的来自客户侧的信号进行缓存。
在本发明的一个可选实施例中，所述方法还包括：
根据来自客户侧的信号流量信息，确定ODU信号的数量n。
具体过程包括：
选定ODU类型，从而确定该ODU类型所对应的ODU标称比特率；
选择n值，使得n个ODU标称比特率相加大于允许的来自客户侧的信号流量，n－1个ODU标称比特率相加小于允许的来自客户侧的信号流量，其中，允许的来自客户侧的信号流量由来自客户侧的信号流量控制信息决定。
本发明实施例中，ODU信号类型可以通过预先配置的方式进行设定；现有ITU-T G.709标准中定义了出的ODU信号的类型包括：ODU0、ODU1、ODU2、ODU3、ODU4以及ODUflex，可以从这些类型中选择一种进行配置。显而易见，也可以采用其他一些可能会新定义的ODU信号类型，例如ODU5等，本发明实施例中不对ODU信号类型具体限定。
在本发明实施例中，步骤101将来自客户侧的信号封装进n个ODU信号中的具体方法，是采用现有方法实现的，具体可参见ITU-T G.709标准中的相关描述。
在本发明的一个可选实施例中，步骤102将所述n个ODU信号封装进一个弹性OTU信号中，可以采用如下三种方式中的任意一种来实现：
（1）如图2所示，可以将一个弹性ODU（ODUflex）封装进一个OTUflex信号中：其中，弹性ODU信号是一种特定的ODU信号，该信号在ITU-T G.709标准中有定义；
（2）如图3所示，可以将n个相同类型的ODU信号封装进一个OTUflex信号中，其中n为大于1的整数：
（3）如图4所示，可以将n个不同类型的ODU信号封装进一个OTUflex信号中，其中n为大于1的整数。
示例性的，对于上述方案（1），本发明实施例中可以将来自客户侧的信号直接封装到一个弹性ODU信号中，然后再直接封装到一个OTUflex信号中；而不需要将一个弹性ODU信号封装到固定几个等级的OTU信号中；其中，将来自客户侧的信号封装进一个弹性ODU信号的过程以及将一个弹性ODU信号直接封装到一个OTUflex信号中的过程，可以参考ITU-T G.709标准简单类推出来。
对于上述方案（2），将多个相同类型的低速率ODUk（L， Low Order， 低阶）信号封装进一个OTUflex信号中：其中，ODUk（Optical Channel Data Unit-k）中的k表示速率等级，在现有ITU-T G.709标准中定义了0，1，2，3，4。具体的封装方式可以参考ITU-T G.709标准简单类推出来。
从上述方式（2）可以看出，OTUflex能够封装进数量能连续变化的ODU(L)中，且封装的ODU(L)数量不同时，其对应的标称比特率也不一样。而现有标准中的OTU信号只能封装进固定数量组合的ODU，如OTU2可以封装进8个ODU0；或者，需要大量填充才能封装数量连续变化的ODU(L)，如封装进8个ODU0和封装6个ODU0都是采用一样的OTU2信号，其标称比特率相同。
对于上述方案（3），图4中，r，s，t为大于等于0的整数。图中给出了将多个ODU0、ODU1以及ODU2等封装进一个OTUflex信号的例子（也可以用其他类型的ODU）；其中，ODU0、ODU1以及ODU2是标准ITU-T G.709中定义的ODU类型；OPUflex（flexible Optical Channel Payload Unit，弹性光信道净荷单元）是标准ITU-T G.709中定义的OPU类型；将多个不同类型的ODU(L)封装进一个OTUflex的具体实现方法，可以简单地从将多个相同类型地ODU(L)封装进一个OTUflex的方法简单推理得出，不再详述。
在本发明的一个可选实施例中，所述方法还可以包括：
将所述一个弹性的OTU信号，进行电光转换，生成一个光信道OCh信号；
根据所述来自客户侧的信号的流量信息，确定如下信息中的一种或多种：OCh信号的发送时钟、调制波特率、调制码型及信号频谱位置;
根据确定的所述信息，将所述OCh信号发送出去。
需要说明的是，确定上述信息的具体方式包括：根据流量情况，光纤中的频谱资源情况，传输距离等，再结合所述来自客户侧的信号的流量信息，选择好能传输的所述弹性的OTU对应标称比特率和/或实际比特率，然后选择OCh信号的发送时钟、调制波特率、调制码型及信号频谱位置等。
如图5所示，本发明实施例以线路接收方向作为应用场景对一种可变速率信号的处理方法的具体流程进行说明：
501、将一个弹性的OTU信号解封装后，生成n个ODU信号；所述弹性OTU信号的标称比特率随着n值的不同而改变，所述n为大于等于1的整数；
502、将n个ODU信号解封装生成发送给客户侧的信号。
在本发明的一个可选实施例中，步骤501可以包括：
将一个弹性的OTU信号解封装后，生成一个弹性ODU信号：或者，
将一个弹性的OTU信号解封装后，生成n个相同类型的ODU信号，其中n大于1：或者，
将一个弹性的OTU信号解封装后，生成n个不同类型的ODU信号，其中n大于1。
在本发明的一个可选实施例中，所述方法还可以包括：
获取来自线路侧的一路OCh信号；
根据所述OCh信号的调制波特率、调制码型、信号频谱位置中的一种或多种信息，来接收所述OCh信号。
需要说明的是，本发明实施例所述步骤501中的解封装方法为图1实施例步骤102中所述封装方法的逆过程，步骤502中将n个ODU信号解封装生成发送给客户侧的信号的过程为图1实施例中步骤101所述封装方法的逆过程，具体方案可以直接从图1实施例中所记载的封装方法直接推导获得，在此不做具体赘述。
如图6所示，基于上述图1实施例所述的方法，本发明实施例提出一种可变速率信号的处理设备，以线路发送方向作为应用场景，所述设备可以包括：
ODU封装模块61，用于将来自客户侧的信号封装到n个光信道数据单元ODU信号中；
弹性OTU封装模块62，用于将所述n个ODU信号，封装进一个弹性的光信道传送单元OTU信号中；所述弹性OTU信号的标称比特率随着n值的不同而改变，所述n为大于等于1的整数。
在本发明的一个可选实施例中，所述弹性OTU封装模块通过如下任意一种方法封装所述ODU信号：
将一个弹性ODU信号封装进一个弹性OTU信号中：或者，
将多个相同类型的ODU信号封装进一个弹性OTU信号中：或者，
将多个不同类型的ODU信号封装进一个弹性OTU信号中。
在本发明的一个可选实施例中，所述处理设备还包括：
带宽控制器63，用于根据来自客户侧的信号的流量信息，确定光信道数据单元ODU信号的数量n。
在本发明的一个可选实施例中，所述带宽控制器还用于：
确定如下信息中的一种或多种：OCh信号的发送时钟、调制波特率、调制码型及信号频谱位置；
所述处理设备还包括：
可变速率发送模块64，用于将所述一个弹性的OTU信号，进行电光转换，生成一个光信道OCh信号；并根据所述带宽控制器确定的所述信息，将所述OCh信号发送出去。
在本发明的一个可选实施例中，所述带宽控制器还用于：
根据来自客户侧的信号的流量信息确定流量控制信息；
所述处理设备还包括：
客户信号处理模块65，用于根据所述流量控制信息确定所述来自客户侧的信号是否满足流量控制要求，并将满足所述流量控制要求的来自客户的侧信号，封装到所述n个ODU信号中，将不满足所述流量控制要求的来自客户侧的信号进行缓存。
需要说明的是，由于本发明实施例所述处理设备是基于图1实施例所述的处理方法直接获得的，包含了与所述处理方法实施例相同的技术特征，因此，本发明实施例涉及的具体方案可以参见图1实施例中的相关描述，在此不做赘述。
如图7所示，基于上述图5实施例所述的方法，本发明实施例提出一种可变速率信号的处理设备，以线路接收方向作为应用场景，所述设备可以包括：
弹性OTU解封装模块71，用于将一个弹性的OTU信号解封装后，生成n个ODU信号；所述弹性OTU信号的标称比特率随着n值的不同而改变，所述n为大于等于1的整数；
ODU解封装模块72，用于将所述n个ODU信号解封装生成发送给客户侧的信号。
其中，所述弹性OTU解封装模块通过如下任意一种方案解封装所述弹性OTU信号：
将一个弹性OTU信号，解封装为一个弹性ODU信号：或者，
将一个弹性OTU信号，解封装成n个相同类型的ODU信号，其中n大于1：或者，
将一个弹性OTU信号，解封装成n个不同类型的ODU信号，其中n大于1。
在本发明的一个可选实施例中，所述设备还包括：
可变速率接收模块73，用于获取来自线路侧的一路OCh信号；根据所述OCh信号的调制波特率、调制码型、信号频谱位置中的一种或多种信息，来接收所述OCh信号。
带宽控制器74，主要用于根据所述OCh信号的调制波特率、调制码型、信号频谱位置中的一种或多种，控制所述可变速率接收模块接收所述的OCh信号。可选的，带宽控制器还可以根据所述OCh信号的调制波特率、调制码型、信号频谱位置中的一种或多种信息，控制所述弹性OTU解封装模块或所述ODU解封装模块或客户信号处理模块进行本发明实施例中描述的相应模块的相应处理。另外一种可选的情况下，带宽控制器还可以根据所述客户信号处理模块反馈的处理能力等信息，采用预定的管理/控制平面机制（例如，可以通过GMPLS等来实现）与服务器或其他节点交互的方式来确定发送方向的所述流量控制信息，例如基于图1实施例或基于图3实施例中所述流量控制信息。
客户信号处理模块75，主要用于将所述ODU解封装模块通过解封装生成发送给客户侧的信号，发送给所述客户侧。
需要说明的是，本发明实施例所述的处理设备是基于图5实施例所述处理方法直接获得的装置权项，包含了与图5实施例相同或相应的技术方案，在此不对涉及的技术方案进行详细阐述。
本发明实施例还提供了一种可变速率信号的处理系统， 包括如图6实施例所述的处理设备以及如图7所述的处理设备：
由于本发明实施例所述处理系统包含了图6和图7实施例中的处理设备，具体技术方案可以参见相关实施例中的描述，在此不做一一赘述。
本发明实施例技术方案的实现，能够适应可变带宽网络需求，能投提高信号线路封装效率，降低线路比特率，提升传输性能。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体（Read-Only Memory，ROM）或随机存储记忆体（Random Access Memory，RAM）等。

Claims (13)

  1. 一种可变速率信号的处理方法，其特征在于，所述方法包括：
    将来自客户侧的信号封装到n个光信道数据单元ODU信号中；
    将所述n个ODU信号，封装进一个弹性的光信道传送单元OTU信号中，其中，所述弹性OTU信号的标称比特率随着n值的不同而改变，所述n为大于等于1的整数。
  2. 根据权利要求1所述的处理方法，其特征在于，所述方法还包括：
    根据所述来自客户侧的信号的流量信息，确定流量控制信息；
    根据所述流量控制信息确定所述来自客户侧的信号是否满足流量控制要求；
    将满足所述流量控制要求的来自客户侧的信号，封装到所述n个ODU信号中；
    将不满足所述流量控制要求的来自客户侧的信号进行缓存。
  3. 根据权利要求1或2所述的处理方法，其特征在于，所述方法还包括：
    根据所述来自客户侧的信号的流量信息，确定所述ODU信号的数量n。
  4. 根据权利要求1至3中任一项所述的处理方法，其特征在于，所述方法还包括：
    将所述一个弹性的OTU信号，进行电光转换，生成一个光信道OCh信号；
    根据所述来自客户侧的信号的流量信息，确定如下信息中的一种或多种：OCh信号的发送时钟、调制波特率、调制码型及信号频谱位置；
    根据确定的所述信息，将所述OCh信号发送出去。
  5. 根据权利要求1至4中任一项所述的处理方法，其特征在于，将所述n个ODU信号封装进一个弹性OTU信号中，包括：
    将一个弹性ODU信号封装进一个弹性OTU信号中；或者，
    将多个相同类型的ODU信号封装进一个弹性OTU信号中；或者，
    将多个不同类型的ODU信号封装进一个弹性OTU信号中。
  6. 一种可变速率信号的处理设备，其特征在于，所述设备包括：
    ODU封装模块，用于将来自客户侧的信号封装到n个光信道数据单元ODU信号中；
    弹性OTU封装模块，用于将所述n个ODU信号，封装进一个弹性的光信道传送单元OTU信号中，其中，所述弹性OTU信号的标称比特率随着n值的不同而改变，所述n为大于等于1的整数。
  7. 根据权利要求6所述的处理设备，其特征在于，所述设备还包括：
    带宽控制器，用于根据所述来自客户侧的信号的流量信息，确定流量控制信息；
    所述设备还包括：
    客户信号处理模块，用于根据所述流量控制信息确定所述来自客户侧的信号是否满足流量控制要求，并将满足所述流量控制要求的来自客户侧的信号，封装到所述n个ODU信号中，将不满足所述流量控制要求的来自客户侧的信号进行缓存。
  8. 根据权利要求6或7所述的处理设备，其特征在于，所述带宽控制器还用于：
    根据所述来自客户侧的信号的流量信息，确定所述ODU信号的数量n。
  9. 根据权利要求6至8中任一项所述的处理设备，其特征在于，所述设备还包括：
    可变速率发送模块，用于将所述一个弹性的OTU信号，进行电光转换，生成一个光信道OCh信号；
    相应的，所述带宽控制器还用于：
    根据所述来自客户侧的信号的流量信息，确定如下信息中的一种或多种：所述OCh信号的发送时钟、调制波特率、调制码型及信号频谱位置；
    所述可变速率发送模块，还用于根据所述带宽控制器确定的所述信息，将所述OCh信号发送出去。
  10. 根据权利要求6至9中任一项所述的处理设备，其特征在于，所述弹性OTU封装模块通过如下任意一种方法封装所述ODU信号：
    将一个弹性ODU信号封装进一个弹性OTU信号中：或者，
    将多个相同类型的ODU信号封装进一个弹性OTU信号中：或者，
    将多个不同类型的ODU信号封装进一个弹性OTU信号中。
  11. 一种可变速率信号的处理方法，其特征在于，所述方法包括：
    将一个弹性的OTU信号解封装后，生成n个ODU信号；所述弹性的OTU信号的标称比特率随着n值的不同而改变，所述n为大于等于1的整数；
    将所述n个ODU信号解封装生成发送给客户侧的信号。
  12. 一种可变速率信号的处理设备，其特征在于，所述设备包括：
    弹性OTU解封装模块，用于将一个弹性的OTU信号解封装后，生成n个ODU信号；所述弹性OTU信号的标称比特率随着n值的不同而改变，所述n为大于等于1的整数；
    ODU解封装模块，用于将所述n个ODU信号解封装生成发送给客户侧的信号。
  13. 一种可变速率信号的处理系统，其特征在于，包括：如权利要求6-10中任一项所述的可变速率信号的处理设备，以及如权利要求12所述的可变速率信号处理设备。
PCT/CN2011/078477 2011-08-16 2011-08-16 一种可变速率信号的处理方法、装置及系统 WO2012106946A1 (zh)

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