WO2012116610A1 - Differential clock recovery method and device - Google Patents

Differential clock recovery method and device Download PDF

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Publication number
WO2012116610A1
WO2012116610A1 PCT/CN2012/071429 CN2012071429W WO2012116610A1 WO 2012116610 A1 WO2012116610 A1 WO 2012116610A1 CN 2012071429 W CN2012071429 W CN 2012071429W WO 2012116610 A1 WO2012116610 A1 WO 2012116610A1
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WO
WIPO (PCT)
Prior art keywords
service
clock
packet
cbr service
cbr
Prior art date
Application number
PCT/CN2012/071429
Other languages
French (fr)
Chinese (zh)
Inventor
李争齐
何力
温泰传
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201110051379.5A external-priority patent/CN102655437B/en
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2012116610A1 publication Critical patent/WO2012116610A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/062—Synchronisation of signals having the same nominal but fluctuating bit rates, e.g. using buffers
    • H04J3/0632—Synchronisation of packets and cells, e.g. transmission of voice via a packet network, circuit emulation service [CES]

Definitions

  • the present invention relates to the field of communications, and in particular to a differential clock recovery method and apparatus.
  • CBR Constants Bit Rate
  • the CBR (Constants Bit Rate) service has been widely applied in a traditional time division multiplexing system based network, and its delay, jitter and drift characteristics can be effectively guaranteed.
  • the traditional time division multiplexing system based network has a relatively low transmission efficiency for packet packets, and the IP of the network becomes more and more obvious. In order to simplify the network, it is inevitable to face the problem of how to transmit CBR services in the packet network.
  • the transmission of the CBR service needs to recover the clock of the CBR service at the receiving end.
  • the standard defines three clock recovery modes, a retiming mode, a differential clock mode, and an adaptive clock mode.
  • differential clock algorithm defined by the ATM (Asynchronous Transfer Mode) organization
  • RTP Real-time Transport Protocol
  • Differential clock algorithm the two standard algorithms, the basic principle is the number of clock cycles between the transmission service clock and the device operating clock.
  • the frequency of the clock frequency used by different manufacturers is inconsistent. Therefore, in the interconnection, the frequency of two different devices must be consistent to ensure interworking. This brings about network management and maintenance. Great difficulty.
  • a differential clock recovery method including: setting a timing period for reference by all network devices; when receiving a CBR service, the network device at the transmitting end counts the total amount of information of the CBR service and sends the information to the CBR service.
  • the receiving end network device; the receiving end network device performs clock recovery according to the total information amount of the CBR service and the foregoing timing period.
  • the network device of the transmitting end When the network device of the transmitting end receives the CBR service, the information about the CBR service is collected and sent to the network device at the receiving end.
  • the network device at the sending end collects the information of the CBR service received in each timing cycle when receiving the CBR service. Quantity, and determine the total amount of information of the CBR service; the CBR that the sender network device will receive The service constitutes a packet packet, and the total amount of information of the CBR service is carried in the packet packet and sent to the network device at the receiving end.
  • the receiving end network device performs clock recovery according to the total information amount of the CBR service and the foregoing timing period, including: determining a service frequency according to the total information quantity and a timing period of the CBR service; determining a service clock according to the service frequency; determining a service clock and a device working clock Number of clock cycles between; clock recovery based on the number of clock cycles between the service clock and the device operating clock.
  • the total information volume of the CBR service includes one of the following: the amount of information of the CBR service in all the time periods between the current packet message and the last transmitted packet message; the current packet message and the last transmitted packet message.
  • a differential clock recovery apparatus comprising: a period setting module configured to set a timing period for reference by all network devices; and a statistical transmission module configured to receive a fixed code rate CBR service
  • the clock recovery module is configured to receive the total amount of information of the CBR service, and perform clock recovery according to the total information amount of the CBR service and the timing period.
  • the statistics sending module includes: a differential information generating unit configured to: when receiving the CBR service, count the amount of information of the CBR service received in each timing cycle, and determine the total information amount of the CBR service; the packet message generating unit, It is configured to form the received CBR service into a packet packet, and the total information amount of the CBR service is carried in the packet packet and sent.
  • the clock recovery module includes: a service clock determining unit, configured to determine a service frequency according to a total information quantity and a timing period of the CBR service, and determine a service clock according to the service frequency; a clock cycle number determining unit, configured to determine a service clock and a device working clock The number of clock cycles between; the differential clock recovery unit, set to clock recovery based on the number of clock cycles between the service clock and the device operating clock.
  • the total information volume of the CBR service includes one of the following: the amount of information of the CBR service in all the time periods between the current packet message and the last transmitted packet message; the current packet message and the last transmitted packet message.
  • a standard timing period is set for reference by all network devices, and when the CBR service is transmitted, the total information amount of the CBR service is counted, and the clock recovery is performed according to the relationship between the total information amount of the CBR service and the timing period.
  • the solution solves the existing differential clock recovery method because the frequency of the network device clock frequency is not Consistently causing difficulties in interworking, and thus achieving the effect of ignoring the frequency of the clock frequency and simply and reliably recovering the clock.
  • FIG. 1 is a flow chart of a differential clock recovery method according to an embodiment of the present invention
  • FIG. 2 is a block diagram showing the structure of a differential clock recovery apparatus according to an embodiment of the present invention
  • FIG. 3 is a difference diagram according to a preferred embodiment of the present invention.
  • the differential clock recovery method includes: Step S102: setting a timing period for reference by all network devices; Step S104, when the network device of the sending end receives the CBR service, the CBR service is counted. The total amount of information is sent to the receiving network device.
  • Step S106 The receiving network device performs clock recovery according to the total information amount of the CBR service and the timing period.
  • the foregoing differential clock recovery method sets a standard timing period (for reference by all network devices, which can be generated by the network device according to the working clock), and collects the total information amount of the CBR service according to the timing period, and the total information of the CBR service is used.
  • the quantity and standard timing period indirectly reflect the service clock, thus ignoring the frequency of the clock frequency, eliminating the obstacles of network equipment interworking in the prior art.
  • step S104 may further include the following processing: (1) When receiving the CBR service, the network device at the transmitting end counts the amount of information of the CBR service received in each timing cycle, and determines the total amount of information of the CBR service;
  • the transmitting network device combines the received CBR service into a packet packet, and the total information of the CBR service is carried in the packet packet and sent to the receiving network device.
  • the receiving network device can collect the information of the CBR service received in each timing cycle when receiving the CBR service, so that the CBR service can be sent according to the elapsed timing period before the CBR service is sent in the form of a packet message.
  • the number of the information, the total amount of information of the CBR service is determined, thereby obtaining the basis for recovering the clock.
  • the above method is applied to the packet network. Therefore, when the CBR service is sent, the network device of the transmitting end needs to form a packet packet to be sent, and the total information of the CBR service can be carried in the packet packet. Go out.
  • the receiving network device can not only perform clock recovery, but also perform data recovery.
  • step S106 may further include the following processing:
  • the receiving network device can obtain the accurate frequency information of the service through a simple division operation (total information amount/total time), and then the service clock can be obtained.
  • the number of clock cycles between the service clock required to perform differential clock recovery and the device operating clock can be finally obtained.
  • the clock recovery algorithm can be implemented using the traditional SDH (Synchronous Digital Hierarchy) clock recovery algorithm or a simple digital divider.
  • the total information volume of the CBR service may further include one of the following: information quantity of the CBR service in all the time periods between the current packet message and the last transmitted packet message; the current packet message and the last time The difference between the information amount of the CBR service and the predetermined standard value in all the timing periods between the transmitted packet messages; the amount of information of the CBR service in all the timing periods before the packet message.
  • information quantity of the CBR service in all the time periods between the current packet message and the last transmitted packet message
  • the current packet message and the last time The difference between the information amount of the CBR service and the predetermined standard value in all the timing periods between the transmitted packet messages
  • the amount of information of the CBR service in all the timing periods before the packet message.
  • the first form reflects the amount of information of the CBR service in one or more timing periods between the two packet messages
  • the second form reflects the amount of information of the CBR service in a difference manner, wherein the predetermined standard value is different for The value of the encoding method is also different.
  • the third form uses an accumulated approach to reflect the amount of information in the CBR service.
  • the above preferred embodiments will be described below with reference to examples. The following are the names of the commonly used pulse code modulation methods mentioned in the examples, such as El, T1 and so on.
  • Example 1 For the common E1/T1, the specified timing period is 500us, and each time an E1/T1 packet is sent, the E1 is counted in all the timing periods between the current packet and the last packet.
  • Example 2 For the commonly used E3/T3, the specified timing period is 125us, and each time an E3/T3 packet is sent, the current packet is compared with the last packet. The number of E3/T3 information counted in all timed periods between the packets sent is transmitted to the current packet.
  • Example 3 For the commonly used E4, the timing period is 125us, and each E4 packet is sent. The number of E4 information that is counted in the current packet packet and the last time the packet is sent is carried in the packet packet.
  • Example 4 For the commonly used E1/T1, the specified timing period is 500us.
  • E1/T1 packet message Each time an E1/T1 packet message is sent, the difference between the number of E1/T1 information and the standard value counted in all the timing periods between the current packet and the last packet is carried to the current packet.
  • the standard value per 500us is 25 6 bits
  • the standard value for each 500us of T1 is 193 bits
  • Example 5 For the commonly used E3/T3, the specified timing period is 125us, and each time an E3/T3 packet is sent, the current packet is sent.
  • the difference between the number of E3/T3 information and the standard value counted in all the timing periods between the last time the packet is sent is carried in the current packet; for E3, the standard value per 125us is 4296 bits; For T3, the standard value per 125us is 5592 bits.
  • Example 6 For the commonly used E4, the specified timing period is 125us. For each E4 packet, the current packet and the last packet are sent. The difference between the number of E4 information and the standard value in all the timed periods is carried in the packet. For E4, the standard value is 125,408 bits per 125us.
  • Example 7 Commonly used E1/T1 The specified timing period is 500us. Each time an E1/T1 packet is sent, the number of statistics in all 500 cycles before the current packet is carried into the packet.
  • Example 8 For a group of E3/T3 with a specified timing period of 125us, each time an E3/T3 packet is sent, the number of statistics in all 125us periods before the current packet is carried into the packet.
  • Example 9 For a commonly used E4, the specified timing period is 125us, and each time an E4 packet is sent, the number of statistics in all 125us periods before the current packet is carried into the packet.
  • 2 is a block diagram showing the structure of a differential clock recovery apparatus according to an embodiment of the present invention. As shown in FIG.
  • the differential clock recovery apparatus includes: a period setting module 22 configured to set a timing period for reference by all network devices; a statistics sending module 24 connected to the period setting module 22, set to When receiving the CBR service, the total information volume of the CBR service is counted and sent; the clock recovery module 26 is connected to the statistics sending module 24, and is configured to receive the total information amount of the CBR service, and according to the total information volume of the CBR service and The above timing period performs clock recovery.
  • the foregoing device adopts a scheme of indirectly reflecting the service clock according to the total information amount of the CBR service according to the timing period, and achieves the technical effect of omitting the frequency of the clock frequency and eliminating the obstacle of the network device interworking in the prior art.
  • the statistics sending module 24 may further include: a difference information generating unit 242, configured to: when receiving the CBR service, count the amount of information of the CBR service received in each timing period, and determine the The total amount of information of the CBR service; the packet message generating unit 244 is configured to form the received CBR service into a packet message, and carry the total information amount of the CBR service in the packet message and send the packet.
  • the differential information generating unit 242 needs to count the amount of information of the CBR service received in each timing cycle when receiving the CBR service, so that the CBR service can be sent according to the elapsed time before the CBR service is sent in the form of a packet message.
  • the number of cycles determines the total amount of information of the CBR service, thereby obtaining the basis for recovering the clock.
  • the device is configured to be used in a packet network.
  • the packet message generating unit 244 needs to send the received CBR service into a group packet, and the total information of the CBR service can be carried in the packet information.
  • the packet is sent together in the packet.
  • FIG. 1 Preferably, as shown in FIG.
  • the clock recovery module 26 may further include: a service clock determining unit 262, configured to determine a service frequency according to a total amount of information and a timing period of the CBR service, and determine a service clock according to the service frequency;
  • the clock cycle number determining unit 264 is configured to determine the number of clock cycles between the service clock and the device operating clock;
  • the differential clock recovery unit 266 is configured to perform clock recovery according to the number of clock cycles between the service clock and the device operating clock.
  • the service clock determining unit 262 can obtain the accurate frequency information of the service by a simple division operation (total information amount/total time), and then The service clock is derived such that the clock cycle number determining unit 264 can finally obtain the number of clock cycles between the service clock required to perform differential clock recovery and the device operating clock.
  • the recovery algorithm of the clock used can follow the conventional SDH clock recovery algorithm, or can be implemented using a simple digital frequency divider.
  • the total information volume of the CBR service may further include one of the following: information quantity of the CBR service in all the time periods between the current packet message and the last transmitted packet message; the current packet message and the last time The difference between the information amount of the CBR service and the predetermined standard value in all the timing periods between the transmitted packet messages; the amount of information of the CBR service in all the timing periods before the packet message.
  • information quantity of the CBR service in all the time periods between the current packet message and the last transmitted packet message
  • the current packet message and the last time The difference between the information amount of the CBR service and the predetermined standard value in all the timing periods between the transmitted packet messages; the amount of information of the CBR service in all the timing periods before the packet message.
  • the total amount of information of the CBR service there may be various forms, including but not limited to the above three forms. From the above description, it can be seen that the technical solution provided by the present invention has a clear meaning of clock transmission, ignoring the difference of clock frequencies of different devices, solving the problem of interworking of differential clocks
  • the recovery algorithm of the clock can be followed by the traditional SDH clock recovery algorithm, or can be implemented by a simple digital frequency divider.
  • the algorithm is simple, reliable, and highly integrated, which reduces the cost of the device.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

Disclosed are a differential clock recovery method and device. The method includes: a timing cycle is set for reference by all the network devices; when receiving a CBR service, a network device at the sending end counts the total information amount of the CBR service and sends the same to a network device at the receiving end; and the network device at the receiving end recovers the clock according to the total information amount of the CBR service and the timing cycle. By means of the technical solution provided in the present invention, the problem that it is difficult to communicate due to inconsistent clock frequency points of network devices in the existing differential clock recovery method is solved, further achieving the effects of neglecting the clock frequency points and simply and reliably recovering the clock.

Description

差分时钟恢复方法及装置 技术领域 本发明涉及通信领域， 具体而言， 涉及一种差分时钟恢复方法及装置。 背景技术 CBR (Constants Bit Rate, 固定码率） 业务在传统的基于时分复用系统的网络中， 已经得到了大量的应用， 并且其延时、 抖动和漂移等特性都能得到有效的保证。 但是 传统的基于时分复用系统的网络对于分组报文的传送效率比较低，而网络的 IP化越来 越明显， 为了简化网络， 必然面临如何在分组网络中传送 CBR业务的问题。  TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a differential clock recovery method and apparatus. BACKGROUND OF THE INVENTION The CBR (Constants Bit Rate) service has been widely applied in a traditional time division multiplexing system based network, and its delay, jitter and drift characteristics can be effectively guaranteed. However, the traditional time division multiplexing system based network has a relatively low transmission efficiency for packet packets, and the IP of the network becomes more and more obvious. In order to simplify the network, it is inevitable to face the problem of how to transmit CBR services in the packet network.
CBR业务的传送都需要在接收端恢复 CBR业务的时钟， 目前标准定义了三种时 钟恢复方式， 再定时模式、 差分时钟模式和自适应时钟模式。 目前， 差分时钟恢复的 标准算法有两种， 一种是 ATM (Asynchronous Transfer Mode, 异步传输模式）组织定 义的差分时钟算法， 另外一个是 RTP (Real-time Transport Protocol, 实时传送协议） 协议定义的差分时钟算法， 这两个标准算法， 其基本原理都是传送业务时钟与设备工 作时钟之间的时钟周期数。 但是， 在实际的网络中， 不同厂家采用的时钟频率的频点 不一致， 因此在互联中， 需要通过配置两个不同设备的频点一致， 才能保证互通， 这 对网络的管理和维护带来了很大的困难。 而且， 厂家采用什么样的频点设计自己的系 统， 一般都属于技术保密的范围， 厂家不愿意透露这些信息， 人为造成了互通的困难。 发明内容 本发明提供了一种差分时钟恢复方法及装置， 以至少解决上述问题之一。 根据本发明的一个方面， 提供了一种差分时钟恢复方法， 包括： 设置一个供所有 网络设备参考的定时周期； 发送端网络设备在接收 CBR业务时， 统计该 CBR业务的 总信息量并发送给接收端网络设备；接收端网络设备根据该 CBR业务的总信息量及上 述定时周期进行时钟恢复。 发送端网络设备在接收 CBR业务时， 统计该 CBR业务的信息量并发送给接收端 网络设备包括： 发送端网络设备在接收 CBR业务时， 统计在每个定时周期内接收到的 CBR业务的信息量， 并确定该 CBR业务的总信息量； 发送端网络设备将接收的 CBR 业务组成分组报文，将该 CBR业务的总信息量携带在上述分组报文中并发送给接收端 网络设备。 接收端网络设备根据该 CBR业务的总信息量及上述定时周期进行时钟恢复包括： 根据 CBR业务的总信息量及定时周期确定业务频率； 根据上述业务频率确定业务时 钟； 确定业务时钟与设备工作时钟之间的时钟周期数； 根据业务时钟与设备工作时钟 之间的时钟周期数进行时钟恢复。 上述 CBR业务的总信息量包括以下之一：本次分组报文与上次发送的分组报文之 间所有定时周期内 CBR业务的信息量；本次分组报文与上次发送的分组报文之间所有 定时周期内 CBR业务的信息量与预定标准值之间的差值；本次分组报文之前所有定时 周期内 CBR业务的信息量。 根据本发明的另一方面， 提供了一种差分时钟恢复装置， 包括： 周期设置模块， 设置为设置一个供所有网络设备参考的定时周期； 统计发送模块， 设置为在接收固定 码率 CBR业务时， 统计该 CBR业务的总信息量并发送； 时钟恢复模块， 设置为接收 上述 CBR业务的总信息量， 并根据该 CBR业务的总信息量及上述定时周期进行时钟 恢复。 统计发送模块包括： 差分信息产生单元， 设置为在接收 CBR业务时， 统计在每个 定时周期内接收到的 CBR业务的信息量， 并确定该 CBR业务的总信息量； 分组报文 发生单元， 设置为将接收的 CBR业务组成分组报文， 将该 CBR业务的总信息量携带 在上述分组报文中并发送。 时钟恢复模块包括： 业务时钟确定单元， 设置为根据 CBR业务的总信息量及定时 周期确定业务频率， 并根据上述业务频率确定业务时钟； 时钟周期数确定单元， 设置 为确定业务时钟与设备工作时钟之间的时钟周期数； 差分时钟恢复单元， 设置为根据 业务时钟与设备工作时钟之间的时钟周期数进行时钟恢复。 上述 CBR业务的总信息量包括以下之一：本次分组报文与上次发送的分组报文之 间所有定时周期内 CBR业务的信息量；本次分组报文与上次发送的分组报文之间所有 定时周期内 CBR业务的信息量与预定标准值之间的差值；本次分组报文之前所有定时 周期内 CBR业务的信息量。 通过本发明， 采用设置一标准的定时周期， 供所有网络设备参考， 在传输 CBR业 务时， 统计 CBR业务的总信息量， 根据 CBR业务的总信息量及定时周期之间的关系 进行时钟恢复的方案， 解决了现有差分时钟恢复方法中由于网络设备时钟频率频点不 一致造成互通困难的问题， 进而达到了忽略时钟频率频点， 简单可靠的恢复时钟的效 果。 附图说明 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部分， 本发 明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的不当限定。 在附图 中： 图 1是根据本发明实施例的差分时钟恢复方法的流程图； 图 2是根据本发明实施例的差分时钟恢复装置的结构框图； 图 3是根据本发明优选实施例的差分时钟恢复装置的结构框图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是， 在不冲突的 情况下， 本申请中的实施例及实施例中的特征可以相互组合。 图 1是根据本发明实施例的差分时钟恢复方法的流程图。 如图 1所示， 根据本发 明实施例的差分时钟恢复方法包括： 步骤 S102, 设置一个供所有网络设备参考的定时周期； 步骤 S104, 发送端网络设备在接收 CBR业务时， 统计该 CBR业务的总信息量并 发送给接收端网络设备； 步骤 S106, 接收端网络设备根据该 CBR业务的总信息量及上述定时周期进行时 钟恢复。 上述差分时钟恢复方法， 设定了一个标准定时周期 （供所有网络设备参考， 可以 由网络设备根据工作时钟产生）， 并根据该定时周期统计 CBR业务的总信息量， 通过 上述 CBR业务的总信息量及标准定时周期间接的反映出了业务时钟，从而忽略了时钟 频率的频点， 消除了现有技术中网络设备互通的障碍。 优选地， 步骤 S104可以进一步包括以下处理： ( 1 )发送端网络设备在接收 CBR业务时， 统计在每个定时周期内接收到的 CBR 业务的信息量， 并确定该 CBR业务的总信息量； The transmission of the CBR service needs to recover the clock of the CBR service at the receiving end. Currently, the standard defines three clock recovery modes, a retiming mode, a differential clock mode, and an adaptive clock mode. Currently, there are two standard algorithms for differential clock recovery. One is the differential clock algorithm defined by the ATM (Asynchronous Transfer Mode) organization, and the other is defined by the Real-time Transport Protocol (RTP) protocol. Differential clock algorithm, the two standard algorithms, the basic principle is the number of clock cycles between the transmission service clock and the device operating clock. However, in an actual network, the frequency of the clock frequency used by different manufacturers is inconsistent. Therefore, in the interconnection, the frequency of two different devices must be consistent to ensure interworking. This brings about network management and maintenance. Great difficulty. Moreover, what kind of frequency point manufacturers use to design their own systems is generally within the scope of technical confidentiality. Manufacturers are reluctant to disclose such information, which artificially creates difficulties in interoperability. SUMMARY OF THE INVENTION The present invention provides a differential clock recovery method and apparatus to address at least one of the above problems. According to an aspect of the present invention, a differential clock recovery method is provided, including: setting a timing period for reference by all network devices; when receiving a CBR service, the network device at the transmitting end counts the total amount of information of the CBR service and sends the information to the CBR service. The receiving end network device; the receiving end network device performs clock recovery according to the total information amount of the CBR service and the foregoing timing period. When the network device of the transmitting end receives the CBR service, the information about the CBR service is collected and sent to the network device at the receiving end. The network device at the sending end collects the information of the CBR service received in each timing cycle when receiving the CBR service. Quantity, and determine the total amount of information of the CBR service; the CBR that the sender network device will receive The service constitutes a packet packet, and the total amount of information of the CBR service is carried in the packet packet and sent to the network device at the receiving end. The receiving end network device performs clock recovery according to the total information amount of the CBR service and the foregoing timing period, including: determining a service frequency according to the total information quantity and a timing period of the CBR service; determining a service clock according to the service frequency; determining a service clock and a device working clock Number of clock cycles between; clock recovery based on the number of clock cycles between the service clock and the device operating clock. The total information volume of the CBR service includes one of the following: the amount of information of the CBR service in all the time periods between the current packet message and the last transmitted packet message; the current packet message and the last transmitted packet message. The difference between the amount of information of the CBR service and the predetermined standard value in all the timing periods; the amount of information of the CBR service in all the timing periods before the packet message. According to another aspect of the present invention, a differential clock recovery apparatus is provided, comprising: a period setting module configured to set a timing period for reference by all network devices; and a statistical transmission module configured to receive a fixed code rate CBR service The clock recovery module is configured to receive the total amount of information of the CBR service, and perform clock recovery according to the total information amount of the CBR service and the timing period. The statistics sending module includes: a differential information generating unit configured to: when receiving the CBR service, count the amount of information of the CBR service received in each timing cycle, and determine the total information amount of the CBR service; the packet message generating unit, It is configured to form the received CBR service into a packet packet, and the total information amount of the CBR service is carried in the packet packet and sent. The clock recovery module includes: a service clock determining unit, configured to determine a service frequency according to a total information quantity and a timing period of the CBR service, and determine a service clock according to the service frequency; a clock cycle number determining unit, configured to determine a service clock and a device working clock The number of clock cycles between; the differential clock recovery unit, set to clock recovery based on the number of clock cycles between the service clock and the device operating clock. The total information volume of the CBR service includes one of the following: the amount of information of the CBR service in all the time periods between the current packet message and the last transmitted packet message; the current packet message and the last transmitted packet message. The difference between the amount of information of the CBR service and the predetermined standard value in all the timing periods; the amount of information of the CBR service in all the timing periods before the packet message. Through the present invention, a standard timing period is set for reference by all network devices, and when the CBR service is transmitted, the total information amount of the CBR service is counted, and the clock recovery is performed according to the relationship between the total information amount of the CBR service and the timing period. The solution solves the existing differential clock recovery method because the frequency of the network device clock frequency is not Consistently causing difficulties in interworking, and thus achieving the effect of ignoring the frequency of the clock frequency and simply and reliably recovering the clock. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a flow chart of a differential clock recovery method according to an embodiment of the present invention; FIG. 2 is a block diagram showing the structure of a differential clock recovery apparatus according to an embodiment of the present invention; FIG. 3 is a difference diagram according to a preferred embodiment of the present invention. A block diagram of the clock recovery device. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. 1 is a flow chart of a differential clock recovery method in accordance with an embodiment of the present invention. As shown in FIG. 1 , the differential clock recovery method according to the embodiment of the present invention includes: Step S102: setting a timing period for reference by all network devices; Step S104, when the network device of the sending end receives the CBR service, the CBR service is counted. The total amount of information is sent to the receiving network device. Step S106: The receiving network device performs clock recovery according to the total information amount of the CBR service and the timing period. The foregoing differential clock recovery method sets a standard timing period (for reference by all network devices, which can be generated by the network device according to the working clock), and collects the total information amount of the CBR service according to the timing period, and the total information of the CBR service is used. The quantity and standard timing period indirectly reflect the service clock, thus ignoring the frequency of the clock frequency, eliminating the obstacles of network equipment interworking in the prior art. Preferably, step S104 may further include the following processing: (1) When receiving the CBR service, the network device at the transmitting end counts the amount of information of the CBR service received in each timing cycle, and determines the total amount of information of the CBR service;
(2)发送端网络设备将接收的 CBR业务组成分组报文，将该 CBR业务的总信息 量携带在上述分组报文中并发送给接收端网络设备。 发送端网络设备在接收 CBR业务时可以统计在每个定时周期内接收到的 CBR业 务的信息量， 这样一来， 在以分组报文的形式发送该 CBR业务之前， 就可以根据经过 的定时周期的数目， 确定出该 CBR业务的总信息量， 从而获得恢复时钟的依据。 由于 上述方法是应用在分组网络中的，所以发送端网络设备在发送 CBR业务时， 需要将其 组成分组报文进行发送，而该 CBR业务的总信息量则可以携带在分组报文中一起发送 出去。 当然， 接收端网络设备在接收到上述的分组报文后， 不但可以进行时钟恢复， 也能够进一步进行数据恢复。 优选地， 步骤 S106可以进一步包括以下处理： (2) The transmitting network device combines the received CBR service into a packet packet, and the total information of the CBR service is carried in the packet packet and sent to the receiving network device. The receiving network device can collect the information of the CBR service received in each timing cycle when receiving the CBR service, so that the CBR service can be sent according to the elapsed timing period before the CBR service is sent in the form of a packet message. The number of the information, the total amount of information of the CBR service is determined, thereby obtaining the basis for recovering the clock. The above method is applied to the packet network. Therefore, when the CBR service is sent, the network device of the transmitting end needs to form a packet packet to be sent, and the total information of the CBR service can be carried in the packet packet. Go out. Of course, after receiving the packet message, the receiving network device can not only perform clock recovery, but also perform data recovery. Preferably, step S106 may further include the following processing:
( 1 ) 根据 CBR业务的总信息量及定时周期确定业务频率； (1) determining the service frequency based on the total amount of information and the timing period of the CBR service;
(2) 根据上述业务频率确定业务时钟； (3 ) 确定业务时钟与设备工作时钟之间的时钟周期数； (2) determining a service clock according to the above service frequency; (3) determining a number of clock cycles between the service clock and the device operating clock;
(4) 根据业务时钟与设备工作时钟之间的时钟周期数进行时钟恢复。 接收端网络设备在获得了 CBR业务的总信息量及定时周期后，通过一个简单的除 法运算 （总信息量 /总时间）， 就可以获得业务的准确频率信息， 进而就可以得出业务 时钟， 从而可以最终获得进行差分时钟恢复所需的业务时钟与设备工作时钟之间的时 钟周期数。 在进行时钟恢复时， 采用的时钟的恢复算法可以沿用传统的 SDH ( Synchronous Digital Hierarchy, 同步数字体系）时钟恢复算法， 也可以使用简单的数 字分频器实现。 优选地， 上述 CBR业务的总信息量可以进一步包括以下之一： 本次分组报文与上次发送的分组报文之间所有定时周期内 CBR业务的信息量； 本次分组报文与上次发送的分组报文之间所有定时周期内 CBR业务的信息量与 预定标准值之间的差值； 本次分组报文之前所有定时周期内 CBR业务的信息量。 对于 CBR业务的总信息量来说，可以有多种体现形式，包括但不限于上述三种形 式。 第一种形式反映了两次分组报文之间一个或多个定时周期内 CBR业务的信息量， 第二种形式以差值的方式反映 CBR业务的信息量，其中的预定标准值对于不同的编码 方式取值也是不同的。 第三种形式采用累加的方式来反映 CBR业务的信息量。 下面结合实例对上述优选实施例进行说明。 下面是实例中提到的 El、 T1 等名称 皆为常用的脉码调制方法的代称。 实例 1 : 对用常用的 E1/T1 , 规定定时周期为 500us， 每发送一个 E1/T1的分组报 文， 就将当前分组报文与上次发送分组报文之间所有定时周期内统计的 E1/T1信息数 携带到本次分组报文中； 实例 2: 对用常用的 E3/T3 , 规定定时周期为 125us， 每发送一个 E3/T3的分组报 文， 就将当前分组报文与上次发送分组报文之间所有定时周期内统计的 E3/T3信息数 携带到本次分组报文中； 实例 3 : 对用常用的 E4， 规定定时周期为 125us， 每发送一个 E4的分组报文， 就 将当前分组报文与上次发送分组报文之间所有定时周期内统计的 E4信息数携带到本 次分组报文中； 实例 4: 对用常用的 E1/T1 , 规定定时周期为 500us， 每发送一个 E1/T1的分组报 文， 就将当前分组报文与上次发送分组报文之间所有定时周期内统计的 E1/T1信息数 与标准值之间的差值携带到本次分组报文中；对于 E1，每 500us的标准值为 256个 bit; 对于 T1每 500us的标准值为 193个 bit; 实例 5: 对用常用的 E3/T3 , 规定定时周期为 125us， 每发送一个 E3/T3的分组报 文， 就将当前分组报文与上次发送分组报文之间所有定时周期内统计的 E3/T3信息数 与标准值之间的差值携带到本次分组报文中； 对于 E3， 每 125us的标准值为 4296个 bit; 对于 T3每 125us的标准值为 5592个 bit; 实例 6: 对用常用的 E4， 规定定时周期为 125us， 每发送一个 E4的分组报文， 就 将当前分组报文与上次发送分组报文之间所有定时周期内统计的 E4信息数与标准值 之间的差值携带到本次分组报文中； 对于 E4， 每 125us的标准值为 17408个 bit; 实例 7: 对用常用的 E1/T1 , 规定定时周期为 500us， 每发送一个 E1/T1的分组报 文， 就将当前分组之前所有 500 周期内的统计信息数携带到本次分组报文中； 实例 8: 对用常用的 E3/T3 , 规定定时周期为 125us， 每发送一个 E3/T3的分组报 文， 就将当前分组之前所有 125us周期内的统计信息数携带到本次分组报文中； 实例 9: 对用常用的 E4， 规定定时周期为 125us， 每发送一个 E4的分组报文， 就 将当前分组之前所有 125us周期内的统计信息数携带到本次分组报文中。 图 2是根据本发明实施例的差分时钟恢复装置的结构框图。 如图 2所示， 根据本 发明实施例的差分时钟恢复装置包括： 周期设置模块 22， 设置为设置一个供所有网络设备参考的定时周期； 统计发送模块 24， 与周期设置模块 22相连， 设置为在接收 CBR业务时， 统计该 CBR业务的总信息量并发送； 时钟恢复模块 26， 与统计发送模块 24相连， 设置为接收上述 CBR业务的总信息 量， 并根据该 CBR业务的总信息量及上述定时周期进行时钟恢复。 上述装置，采用根据定时周期统计 CBR业务的总信息量， 间接的反映业务时钟的 方案， 达到了忽略时钟频率的频点， 消除现有技术中网络设备互通的障碍的技术效果。 优选地， 如图 3所示， 统计发送模块 24可以进一步包括： 差分信息产生单元 242， 设置为在接收 CBR业务时， 统计在每个定时周期内接收 到的 CBR业务的信息量， 并确定该 CBR业务的总信息量； 分组报文发生单元 244， 设置为将接收的 CBR业务组成分组报文， 将该 CBR业 务的总信息量携带在上述分组报文中并发送。 差分信息产生单元 242在接收 CBR业务时需要统计在每个定时周期内接收到的 CBR业务的信息量， 这样一来， 在以分组报文的形式发送该 CBR业务之前， 就可以 根据经过的定时周期的数目，确定出该 CBR业务的总信息量， 从而获得恢复时钟的依 据。 由于上述装置是应用在分组网络中的， 在发送 CBR业务时， 需要由分组报文发生 单元 244将接收到的 CBR业务组成分组报文进行发送， 而该 CBR业务的总信息量则 可以携带在分组报文中一起发送出去。 优选地， 如图 3所示， 时钟恢复模块 26可以进一步包括： 业务时钟确定单元 262， 设置为根据 CBR业务的总信息量及定时周期确定业务频 率， 并根据上述业务频率确定业务时钟； 时钟周期数确定单元 264， 设置为确定业务时钟与设备工作时钟之间的时钟周期 数； 差分时钟恢复单元 266， 设置为根据业务时钟与设备工作时钟之间的时钟周期数 进行时钟恢复。 时钟恢复模块 26在获得了 CBR业务的总信息量及定时周期后， 业务时钟确定单 元 262通过一个简单的除法运算 （总信息量 /总时间）， 就可以获得业务的准确频率信 息， 进而就可以得出业务时钟， 从而使时钟周期数确定单元 264可以最终获得进行差 分时钟恢复所需的业务时钟与设备工作时钟之间的时钟周期数。 差分时钟恢复单元 266在进行时钟恢复时， 采用的时钟的恢复算法可以沿用传统的 SDH时钟恢复算法， 也可以使用简单的数字分频器实现。 优选地， 上述 CBR业务的总信息量可以进一步包括以下之一： 本次分组报文与上次发送的分组报文之间所有定时周期内 CBR业务的信息量； 本次分组报文与上次发送的分组报文之间所有定时周期内 CBR业务的信息量与 预定标准值之间的差值； 本次分组报文之前所有定时周期内 CBR业务的信息量。 对于 CBR业务的总信息量来说，可以有多种体现形式，包括但不限于上述三种形 式。 从以上的描述中， 可以看出， 本发明提供的技术方案时钟传递的含义明确， 忽略 了不同设备时钟频率频点的差异， 解决了差分时钟的互通问题， 简化了设计， 方便了 维护管理。而且， 在恢复时钟时， 采用的时钟的恢复算法可以沿用传统的 SDH时钟恢 复算法， 也可以使用简单的数字分频器实现， 算法简单、 可靠、 集成度高， 降低了设 备的成本。 显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布在多个计算装置所 组成的网络上， 可选地， 它们可以用计算装置可执行的程序代码来实现， 从而， 可以 将它们存储在存储装置中由计算装置来执行， 并且在某些情况下， 可以以不同于此处 的顺序执行所示出或描述的步骤， 或者将它们分别制作成各个集成电路模块， 或者将 它们中的多个模块或步骤制作成单个集成电路模块来实现。 这样， 本发明不限制于任 何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本领域的技 术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内， 所作的 任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。 (4) Clock recovery based on the number of clock cycles between the service clock and the device operating clock. After obtaining the total amount of information and the timing period of the CBR service, the receiving network device can obtain the accurate frequency information of the service through a simple division operation (total information amount/total time), and then the service clock can be obtained. Thus, the number of clock cycles between the service clock required to perform differential clock recovery and the device operating clock can be finally obtained. In the case of clock recovery, the clock recovery algorithm can be implemented using the traditional SDH (Synchronous Digital Hierarchy) clock recovery algorithm or a simple digital divider. Preferably, the total information volume of the CBR service may further include one of the following: information quantity of the CBR service in all the time periods between the current packet message and the last transmitted packet message; the current packet message and the last time The difference between the information amount of the CBR service and the predetermined standard value in all the timing periods between the transmitted packet messages; the amount of information of the CBR service in all the timing periods before the packet message. For the total amount of information of the CBR service, there may be various forms, including but not limited to the above three forms. The first form reflects the amount of information of the CBR service in one or more timing periods between the two packet messages, and the second form reflects the amount of information of the CBR service in a difference manner, wherein the predetermined standard value is different for The value of the encoding method is also different. The third form uses an accumulated approach to reflect the amount of information in the CBR service. The above preferred embodiments will be described below with reference to examples. The following are the names of the commonly used pulse code modulation methods mentioned in the examples, such as El, T1 and so on. Example 1: For the common E1/T1, the specified timing period is 500us, and each time an E1/T1 packet is sent, the E1 is counted in all the timing periods between the current packet and the last packet. The number of /T1 information is carried in this packet; Example 2: For the commonly used E3/T3, the specified timing period is 125us, and each time an E3/T3 packet is sent, the current packet is compared with the last packet. The number of E3/T3 information counted in all timed periods between the packets sent is transmitted to the current packet. Example 3: For the commonly used E4, the timing period is 125us, and each E4 packet is sent. The number of E4 information that is counted in the current packet packet and the last time the packet is sent is carried in the packet packet. Example 4: For the commonly used E1/T1, the specified timing period is 500us. Each time an E1/T1 packet message is sent, the difference between the number of E1/T1 information and the standard value counted in all the timing periods between the current packet and the last packet is carried to the current packet. In the message; for E1, the standard value per 500us is 25 6 bits; The standard value for each 500us of T1 is 193 bits; Example 5: For the commonly used E3/T3, the specified timing period is 125us, and each time an E3/T3 packet is sent, the current packet is sent. The difference between the number of E3/T3 information and the standard value counted in all the timing periods between the last time the packet is sent is carried in the current packet; for E3, the standard value per 125us is 4296 bits; For T3, the standard value per 125us is 5592 bits. Example 6: For the commonly used E4, the specified timing period is 125us. For each E4 packet, the current packet and the last packet are sent. The difference between the number of E4 information and the standard value in all the timed periods is carried in the packet. For E4, the standard value is 125,408 bits per 125us. Example 7: Commonly used E1/T1 The specified timing period is 500us. Each time an E1/T1 packet is sent, the number of statistics in all 500 cycles before the current packet is carried into the packet. Example 8: For a group of E3/T3 with a specified timing period of 125us, each time an E3/T3 packet is sent, the number of statistics in all 125us periods before the current packet is carried into the packet. Example 9: For a commonly used E4, the specified timing period is 125us, and each time an E4 packet is sent, the number of statistics in all 125us periods before the current packet is carried into the packet. 2 is a block diagram showing the structure of a differential clock recovery apparatus according to an embodiment of the present invention. As shown in FIG. 2, the differential clock recovery apparatus according to the embodiment of the present invention includes: a period setting module 22 configured to set a timing period for reference by all network devices; a statistics sending module 24 connected to the period setting module 22, set to When receiving the CBR service, the total information volume of the CBR service is counted and sent; the clock recovery module 26 is connected to the statistics sending module 24, and is configured to receive the total information amount of the CBR service, and according to the total information volume of the CBR service and The above timing period performs clock recovery. The foregoing device adopts a scheme of indirectly reflecting the service clock according to the total information amount of the CBR service according to the timing period, and achieves the technical effect of omitting the frequency of the clock frequency and eliminating the obstacle of the network device interworking in the prior art. Preferably, as shown in FIG. 3, the statistics sending module 24 may further include: a difference information generating unit 242, configured to: when receiving the CBR service, count the amount of information of the CBR service received in each timing period, and determine the The total amount of information of the CBR service; the packet message generating unit 244 is configured to form the received CBR service into a packet message, and carry the total information amount of the CBR service in the packet message and send the packet. The differential information generating unit 242 needs to count the amount of information of the CBR service received in each timing cycle when receiving the CBR service, so that the CBR service can be sent according to the elapsed time before the CBR service is sent in the form of a packet message. The number of cycles determines the total amount of information of the CBR service, thereby obtaining the basis for recovering the clock. The device is configured to be used in a packet network. When the CBR service is sent, the packet message generating unit 244 needs to send the received CBR service into a group packet, and the total information of the CBR service can be carried in the packet information. The packet is sent together in the packet. Preferably, as shown in FIG. 3, the clock recovery module 26 may further include: a service clock determining unit 262, configured to determine a service frequency according to a total amount of information and a timing period of the CBR service, and determine a service clock according to the service frequency; The clock cycle number determining unit 264 is configured to determine the number of clock cycles between the service clock and the device operating clock; the differential clock recovery unit 266 is configured to perform clock recovery according to the number of clock cycles between the service clock and the device operating clock. After the clock recovery module 26 obtains the total amount of information and the timing period of the CBR service, the service clock determining unit 262 can obtain the accurate frequency information of the service by a simple division operation (total information amount/total time), and then The service clock is derived such that the clock cycle number determining unit 264 can finally obtain the number of clock cycles between the service clock required to perform differential clock recovery and the device operating clock. When the clock recovery is performed by the differential clock recovery unit 266, the recovery algorithm of the clock used can follow the conventional SDH clock recovery algorithm, or can be implemented using a simple digital frequency divider. Preferably, the total information volume of the CBR service may further include one of the following: information quantity of the CBR service in all the time periods between the current packet message and the last transmitted packet message; the current packet message and the last time The difference between the information amount of the CBR service and the predetermined standard value in all the timing periods between the transmitted packet messages; the amount of information of the CBR service in all the timing periods before the packet message. For the total amount of information of the CBR service, there may be various forms, including but not limited to the above three forms. From the above description, it can be seen that the technical solution provided by the present invention has a clear meaning of clock transmission, ignoring the difference of clock frequencies of different devices, solving the problem of interworking of differential clocks, simplifying design, and facilitating maintenance management. Moreover, when recovering the clock, the recovery algorithm of the clock can be followed by the traditional SDH clock recovery algorithm, or can be implemented by a simple digital frequency divider. The algorithm is simple, reliable, and highly integrated, which reduces the cost of the device. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

权 利 要 求 书 Claim
1. 一种差分时钟恢复方法， 包括： A differential clock recovery method, comprising:
设置一个供所有网络设备参考的定时周期；  Set a timing period for reference by all network devices;
发送端网络设备在接收固定码率 CBR业务时， 统计所述 CBR业务的总信 息量并发送给接收端网络设备；  When receiving the fixed rate CBR service, the network device at the sending end collects the total amount of information of the CBR service and sends it to the network device at the receiving end;
所述接收端网络设备根据所述 CBR业务的总信息量及所述定时周期进行 时钟恢复。  The receiving end network device performs clock recovery according to the total information amount of the CBR service and the timing period.
2. 根据权利要求 1所述的方法， 其中， 所述发送端网络设备在接收固定码率 CBR 业务时， 统计所述 CBR业务的信息量并发送给接收端网络设备包括： The method according to claim 1, wherein, when the transmitting network device receives the fixed code rate CBR service, the information of the CBR service is collected and sent to the receiving network device, including:
所述发送端网络设备在接收 CBR业务时，统计在每个定时周期内接收到的 CBR业务的信息量， 并确定所述 CBR业务的总信息量；  When receiving the CBR service, the network device at the transmitting end collects the information amount of the CBR service received in each timing cycle, and determines the total information amount of the CBR service;
所述发送端网络设备将接收的所述 CBR业务组成分组报文， 将所述 CBR 业务的总信息量携带在所述分组报文中并发送给接收端网络设备。  The transmitting network device combines the received CBR service into a packet packet, and carries the total information amount of the CBR service in the packet packet and sends the packet to the receiving network device.
3. 根据权利要求 2所述的方法，其中，所述接收端网络设备根据所述 CBR业务的 总信息量及所述定时周期进行时钟恢复包括： The method according to claim 2, wherein the receiving end network device performs clock recovery according to the total information amount of the CBR service and the timing period, including:
根据所述 CBR业务的总信息量及所述定时周期确定业务频率； 根据所述业务频率确定业务时钟；  Determining a service frequency according to the total information amount of the CBR service and the timing period; determining a service clock according to the service frequency;
确定所述业务时钟与设备工作时钟之间的时钟周期数；  Determining a number of clock cycles between the service clock and a device operating clock;
根据所述业务时钟与设备工作时钟之间的时钟周期数进行时钟恢复。  The clock recovery is performed according to the number of clock cycles between the service clock and the working clock of the device.
4. 根据权利要求 3所述的方法， 其中， 所述 CBR业务的总信息量包括以下之一： 本次分组报文与上次发送的分组报文之间所有定时周期内 CBR业务的信 本次分组报文与上次发送的分组报文之间所有定时周期内 CBR业务的信 息量与预定标准值之间的差值； The method according to claim 3, wherein the total information volume of the CBR service includes one of the following: a letter of a CBR service in all timed periods between the current packet message and the last transmitted packet message. The difference between the information amount of the CBR service and the predetermined standard value in all the timing periods between the sub-packet message and the last transmitted packet message;
本次分组报文之前所有定时周期内 CBR业务的信息量。  The amount of information on CBR services in all timing periods before this packet.
5. 一种差分时钟恢复装置， 包括： 周期设置模块， 设置为设置一个供所有网络设备参考的定时周期； 统计发送模块， 设置为在接收固定码率 CBR业务时， 统计所述 CBR业务 的总信息量并发送； 5. A differential clock recovery device comprising: a period setting module, configured to set a timing period for reference by all network devices; and a statistical sending module, configured to collect the total information amount of the CBR service and send the fixed rate rate CBR service;
时钟恢复模块， 设置为接收所述 CBR业务的总信息量， 并根据所述 CBR 业务的总信息量及所述定时周期进行时钟恢复。  The clock recovery module is configured to receive the total amount of information of the CBR service, and perform clock recovery according to the total information amount of the CBR service and the timing period.
6. 根据权利要求 5所述的装置， 其中， 所述统计发送模块包括： The device according to claim 5, wherein the statistical sending module comprises:
差分信息产生单元，设置为在接收 CBR业务时，统计在每个定时周期内接 收到的 CBR业务的信息量， 并确定所述 CBR业务的总信息量；  The differential information generating unit is configured to, when receiving the CBR service, count the amount of information of the CBR service received in each timing period, and determine the total amount of information of the CBR service;
分组报文发生单元，设置为将接收的所述 CBR业务组成分组报文，将所述 CBR业务的总信息量携带在所述分组报文中并发送。  The packet packet generating unit is configured to form the received CBR service into a packet packet, and carry the total information amount of the CBR service in the packet packet and send the packet.
7. 根据权利要求 6所述的装置， 其中， 所述时钟恢复模块包括： The device of claim 6, wherein the clock recovery module comprises:
业务时钟确定单元，设置为根据所述 CBR业务的总信息量及所述定时周期 确定业务频率， 并根据所述业务频率确定业务时钟；  The service clock determining unit is configured to determine a service frequency according to the total information amount of the CBR service and the timing period, and determine a service clock according to the service frequency;
时钟周期数确定单元， 设置为确定所述业务时钟与设备工作时钟之间的时 钟周期数；  a clock cycle number determining unit, configured to determine a number of clock cycles between the service clock and a device operating clock;
差分时钟恢复单元， 设置为根据所述业务时钟与设备工作时钟之间的时钟 周期数进行时钟恢复。  The differential clock recovery unit is configured to perform clock recovery according to the number of clock cycles between the service clock and the device operating clock.
8. 根据权利要求 7所述的装置， 其中， 所述 CBR业务的总信息量包括以下之一： 本次分组报文与上次发送的分组报文之间所有定时周期内 CBR业务的信 本次分组报文与上次发送的分组报文之间所有定时周期内 CBR业务的信 息量与预定标准值之间的差值； 8. The apparatus according to claim 7, wherein the total information amount of the CBR service comprises one of the following: a letter of a CBR service in all timed periods between the current packet message and the last transmitted packet message. The difference between the information amount of the CBR service and the predetermined standard value in all the timing periods between the sub-packet message and the last transmitted packet message;
本次分组报文之前所有定时周期内 CBR业务的信息量。  The amount of information on CBR services in all timing periods before this packet.
PCT/CN2012/071429 2011-03-03 2012-02-22 Differential clock recovery method and device WO2012116610A1 (en)

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US20070014296A1 (en) * 2005-07-15 2007-01-18 Samsung Electronics Co., Ltd. Clock recovery method and apparatus for constant bit rate (CBR) traffic
WO2008051123A1 (en) * 2006-10-27 2008-05-02 Telefonaktiebolaget Lm Ericsson (Publ) Method for clock recovery using updated timestamps
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CN1551556A (en) * 2003-03-07 2004-12-01 卓联半导体有限公司 Clock synchronisation over a packet network
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