WO2012034384A1 - 一种以太网无源光网络节能状态下维持链路的方法及*** - Google Patents

一种以太网无源光网络节能状态下维持链路的方法及*** Download PDF

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WO2012034384A1
WO2012034384A1 PCT/CN2011/071624 CN2011071624W WO2012034384A1 WO 2012034384 A1 WO2012034384 A1 WO 2012034384A1 CN 2011071624 W CN2011071624 W CN 2011071624W WO 2012034384 A1 WO2012034384 A1 WO 2012034384A1
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Prior art keywords
link
onu
olt
maintaining
saving state
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PCT/CN2011/071624
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English (en)
French (fr)
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何苑凌
臧美燕
张德智
袁立权
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中兴通讯股份有限公司
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Publication of WO2012034384A1 publication Critical patent/WO2012034384A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0088—Signalling aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1301—Optical transmission, optical switches

Definitions

  • the present invention relates to the field of Ethernet Passive Optical Network (EPON), and more particularly to a method and system for maintaining a link in an energy-saving state in an EPON system.
  • EPON Ethernet Passive Optical Network
  • the system usually consists of optical line terminals (OLT, Optical Line Terminal).
  • the optical network unit (ONU), the optical network termination (ONT), and the optical distribution network (ODN) are formed on the user side, as shown in FIG. 1 .
  • the ODN is composed of a single-mode optical fiber, a passive optical device such as an optical splitter, and an optical connector.
  • the ODN provides an optical transmission medium for the physical connection between the OLT and the ONU/ONT.
  • the ODN is usually a point-to-multipoint structure, that is, one OLT connects multiple ONUs.
  • a link maintenance mechanism is defined in IEEE 802.3-2005 Section 5 Clause 64.3.
  • the OLT does not send a GATE Multi-Point Control Protocol (MPCP) message to the ONU within 50 ms, then The ONU sends an empty GATE MPCP packet. If the OLT does not receive the report (REPORT) MPCP packet within 1 second, the OLT considers that a serious link error has occurred between the OLT and the ONU.
  • the state machine corresponding to the ONU migrates to the deregistered state, and then re-initiates the registration process of the ONU.
  • MPCP GATE Multi-Point Control Protocol
  • An ONU that is in the registered state sends an empty REPORT MPCP packet to the OLT if it does not send a REPORT MPCP packet to the OLT within 50 ms. If the ONU does not receive the OLT within 1 second A GATE MPCP message sent to itself is considered to have a link critical error, migrated to the WATCHDOG TIMEOUT state, and then re-registered. It can be seen from the above rules that for an ONU in the registered state, the OLT needs to send 4 messages to the ONU at intervals of up to 50 ms. Similarly, the ONU needs to send packets to the OLT at intervals of up to 50 ms.
  • Some business layer protocols also have a link maintenance mechanism.
  • IGMP Internet Group Management Protocol
  • QUERY IGMP Query
  • REPORT IGMP Report
  • the ONU's reception and transmission are turned off, or the transmission is turned off.
  • the prior art needs to send a data frame for maintaining a link between the ONU and the OLT to implement a link maintenance mechanism, and the data frame cannot be sent in a power saving state (including the data frame that maintains the link cannot be normally sent), Therefore, in fact, in the energy-saving state, the existing technology is still used, and the link maintenance mechanism cannot be implemented. In this case, there is a possibility that the ONU is deregistered or the service-level link is interrupted. However, the requirement for energy saving cannot affect the registration of the service and ONU. Therefore, how to maintain the link in the energy-saving state has become a problem to be solved, and there is no effective solution at present. Summary of the invention
  • the main object of the present invention is to provide a method and system for maintaining a link in an energy-saving state of an Ethernet passive optical network, which can implement link maintenance in an energy-saving state.
  • a method for maintaining a link in an energy-saving state of an Ethernet passive optical network comprising: an optical network unit (ONU) periodically waking up in an energy-saving state according to a default sleep cycle or a sleep cycle configured by an optical line terminal (OLT); Receive and send data to maintain the link when it is awake frame.
  • ONU optical network unit
  • OLT optical line terminal
  • the manner in which the OLT configures the sleep cycle for the ONU includes: an OLT extended operation management and maintenance (OAM) message, and the configured sleep cycle is added to the extended OAM message and sent to the ONU.
  • OAM OLT extended operation management and maintenance
  • the default sleep period or the configured sleep period is smaller than the maximum transmission time interval of the data frame that the system requires to maintain the link.
  • the implementation manner of the periodic wakeup includes: a manner of triggering after a timer or a counter expires, or a manner in which the ONU responds to an OLT message.
  • a system for maintaining a link in an energy-saving state of an Ethernet passive optical network comprising: a configuration unit and a first link maintenance unit;
  • a configuration unit configured by the OLT to configure a sleep cycle for the ONU
  • the first link maintaining unit is configured to perform link maintenance by receiving and transmitting data frames for maintaining the link when the ONU periodically wakes up in the power saving state according to a default sleep cycle or a sleep cycle configured by the OLT.
  • the configuration unit is further configured to: extend the OAM message by the OLT, add the configured sleep period to the extended OAM message, and send the sleep period to the ONU, and implement the OLT to configure the ONU for the ONU. Sleep cycle.
  • the default sleep period or the configured sleep period is smaller than the maximum transmission time interval of the data frame that the system requires to maintain the link.
  • a method for maintaining a link in an energy-saving state of an Ethernet passive optical network comprising: setting a transmission frequency of a protocol packet or a data packet between an ONU and an OLT for maintaining a link; and transmitting a signal for maintaining a link
  • the transmission time interval is greater than or equal to the sleep period of the ONU according to the set transmission frequency.
  • the method further includes: setting, by the OLT, the sending time interval by using an extended OAM message, or adjusting, by the ONU, the sending time interval according to the sleep period.
  • a system for maintaining a link in an energy-saving state of an Ethernet passive optical network comprising: a setting unit and a second link maintaining unit;
  • a setting unit configured to set a sending frequency of a protocol packet or a data packet used by the ONU and the OLT to maintain the link
  • the second link maintaining unit is configured to enable the link period to be greater than or equal to the sleep period of the ONU according to the set transmission frequency, and implement link maintenance by sending a protocol packet or a data packet for maintaining the link.
  • the second link maintaining unit is further configured to set the sending time interval by the OLT by using an extended OAM message, or adjust the sending time interval according to the sleep period by the ONU.
  • the present invention has two solutions, one of which includes: The ONU periodically wakes up in a power saving state according to a default sleep cycle or an OLT configured sleep cycle; and receives and transmits a data frame for maintaining a link when periodically waking up.
  • the present invention since there is a sleep cycle, even in a power-saving state, it can periodically wake up in a power-saving state according to a sleep cycle, and can receive and transmit a data frame for maintaining a link, thereby realizing a chain in a power-saving state.
  • FIG. 1 is a schematic diagram of a basic structure of a prior art EPON network
  • FIG. 2 is a flowchart of maintaining an ONU of an MPCP protocol link in a sleep mode according to Embodiment 1 of the present invention
  • FIG. 3 is a flowchart of an ONU of a link for maintaining a service layer protocol in a sleep mode according to Embodiment 2 of the present invention. detailed description
  • the basic idea of the invention is: The invention has two sets of solutions, one of which includes: ONU
  • the power cycle is periodically awakened according to the default sleep cycle or the sleep cycle configured by the OLT; the data frame for maintaining the link is received and transmitted during the periodic wakeup.
  • a method for maintaining a link in an energy-saving state of an Ethernet passive optical network mainly includes the following two aspects:
  • the ONU periodically wakes up in a power-saving state according to a default sleep cycle or a sleep cycle configured by the OLT; and receives and transmits a data frame for maintaining the link when periodically waking up.
  • the manner in which the OLT configures the sleep cycle for the ONU includes: the OLT extends the OAM message, and adds the configured sleep period to the extended OAM message, and sends the OAM message to the ONU.
  • the 0 AM is an abbreviation of Operation, Administraion & Maintenance, and refers to operation, management, and maintenance.
  • the default sleep period or the configured sleep period is less than the maximum transmission interval of the data frame that the system requires to maintain the link.
  • the implementation of the periodic wakeup includes: a method of triggering after a timer or a counter is timed out, or a manner of responding to the 0LT message by the 0NU.
  • the energy saving state includes multiple implementation modes such as a sleep mode or a hiccup mode.
  • the sleep mode refers to a case where the reception and transmission of the ONU are both closed;
  • the hiccup mode refers to a case where the transmission of the ONU is turned off, and the reception of the ONU is turned on.
  • a system for maintaining a link in an energy-saving state of an Ethernet passive optical network comprising: a configuration unit and a first link maintenance unit.
  • the configuration unit is configured to configure a sleep cycle for the ONU to be 0NU;
  • the first link maintenance unit is configured to receive and transmit the link for maintaining the link when the ONU periodically wakes up in the energy-saving state according to the default sleep cycle or the sleep cycle configured by the OLT.
  • the data frame implements link maintenance.
  • the configuration unit is further configured to add the configured sleep period to the extended 0AM message by using the 0LT extended 0AM message, and send the method to the ONU to implement the 0LT as 0NU. Configure the sleep cycle.
  • the default sleep period or configured sleep period is less than the maximum transmission interval of the data frame that the system requires to maintain the link.
  • the second aspect is: setting a transmission frequency of a protocol packet or a data packet for maintaining a link between the ONU and the OLT; sending a protocol packet or a data packet for maintaining the link, and setting a transmission interval according to the set transmission frequency Greater than or equal to the sleep period of the ONU.
  • the sending time interval may be set by the OLT by extending the OAM message, or may be adjusted by the ONU according to the sleep cycle. This ensures that the data packets sent between the ONU and the OLT can meet the requirements of maintaining the link.
  • the sleep cycle referred to herein is not limited to the present description, and any description that can implement the sleep cycle function is within the scope of the present invention, such as a wake-up cycle, a wake-up interval, and the like.
  • a system for maintaining a link in an energy-saving state of an Ethernet passive optical network comprising: a setting unit and a second link maintaining unit.
  • the setting unit is configured to set a transmission frequency of a protocol packet or a data packet between the ONU and the OLT for maintaining a link; and the second link maintaining unit is configured to make the transmission time interval greater than or equal to the ONU according to the set transmission frequency.
  • link maintenance is achieved by sending protocol messages or data packets for maintaining the link.
  • the second link maintaining unit is further configured to set a transmission time interval by the OLT through the extended OAM message, or adjust the transmission time interval according to the sleep period by the ONU.
  • the present invention is a solution for implementing a link maintenance mechanism in an energy-saving state, which can meet the needs of system energy conservation, and can close the receiving and/or transmitting of the optical module during sleep or snoring to achieve The purpose of energy saving. At the same time, it cooperates with the media access control (MAC layer) and the link maintenance mechanism of the service layer to avoid the ONU deregistration or service disconnection.
  • MAC layer media access control
  • the invention is illustrated by way of example below.
  • Embodiment 1 In the sleep mode, the process of maintaining an ONU of the MPCP protocol link is used for In the sleep mode, the maintenance link mechanism of the MPCP protocol is guaranteed to operate normally. It should be noted that the MPCP protocol is a link maintenance mechanism for the MAC layer, and will not be described.
  • Step 101 The ONU of the EPON system starts the energy saving mode.
  • Step 102 The ONU enters the sleep mode and turns off the sending and receiving functions of the optical module.
  • Step 103 The ONU starts the timer T while entering the sleep mode.
  • Step 104 Determine whether the timer ⁇ times out, if yes, execute step 105; otherwise, wait, continue to determine whether the timer ⁇ times out.
  • Step 105 The ONU receives the GATE frame from the OLT after the timer expires.
  • Step 106 Determine whether there is uplink traffic. If yes, go to step 107; otherwise, go to step 108.
  • Step 107 If there is uplink traffic, the corresponding REPORT frame is sent according to the rule of Dynamic Bandwidth Allocation (DBA) to achieve the purpose of allocating the uplink bandwidth for the ONU; and then step 102 is performed.
  • DBA Dynamic Bandwidth Allocation
  • Step 108 If there is no uplink traffic, send an empty REPORT frame to the OLT in the time slot specified by the GATE frame, and the empty REPORT frame is the data frame for maintaining the link; then step 102 is performed.
  • the timeout period of the timer T should be less than the maximum REPORT frame acceptance interval specified by the OLT, and the value of the timer T can be set to 50 ms by default.
  • the OLT can configure the value of the timer T by extending the OAM message.
  • the format of the extended OAM message is shown in Table 1. It is a table for configuring the extended OAM packet frame format of the sleep cycle.
  • Variable Width is used to indicate the length of the Variable value field, its value is 04 4 Sleep cycle identifies the time that the ONU is held in sleep mode, in units of time quantification
  • Octet(s) in Table 1 represents bytes; Branch represents variable parts; Leaf represents variable pages; Variable Width represents variable widths.
  • Embodiment 2 The process of maintaining the ONU of the link of the service layer protocol in the sleep mode, and ensuring the normal operation of the maintenance link mechanism of the service layer protocol in the sleep mode.
  • the MPCP maintain link mechanism uses other methods than the above-mentioned first embodiment to perform link maintenance, or the system captures the MPCP timer, the manner of interfering with the MPCP state machine,
  • the PON system If the PON system can operate normally, the PON system only needs to ensure that the maintenance link mechanism of the service layer protocol runs normally.
  • Step 201 The ONU of the EPON system starts the energy saving mode.
  • Step 202 The ONU enters a sleep mode to disable the sending and receiving functions of the optical module.
  • Step 203 The ONU starts the timer T while entering the sleep mode.
  • Step 204 Determine whether the timer ⁇ times out. If yes, execute step 205; otherwise, wait, continue to determine whether the timer ⁇ has timed out.
  • Step 205 The ONU receives the GATE frame from the OLT after the timer expires.
  • Step 206 The ONU sends an uplink protocol frame for maintaining the link in a time slot specified by the GATE frame; and then step 202 is performed.
  • the OLT should send a GATE frame to the ONU before the timer expires to ensure that the uplink protocol frame of the ONU can be sent.
  • the timeout period of the timer T should be less than the maximum maintenance link frame acceptance interval specified by the protocol.
  • the default value of timer T is different, and the value of timer T can be set to 50ms by default.
  • the OLT can configure the value of the timer T by extending the OAM message.
  • the format of the extended OAM is as shown in Table 1 above.
  • Embodiment 3 For the doze mode, the ONU responds to the OLT message, and ensures that the MPCP protocol and other protocols maintain the link mechanism in the hiccup mode.
  • the flow of this embodiment includes the following steps:
  • Step 301 The EPON ONU starts the energy-saving mode, enters the hiccup mode, and disables the sending function of the optical module.
  • Step 302 The OLT periodically sends a data packet for maintaining the link to 0 during the ONU snoring.
  • Step 303 The ONU responds to the OLT requesting the ONU during the hiccup mode.
  • the ONU data transmission is temporarily turned on and the response is made.
  • the maintenance link data packet includes two types of packets of the MPCP maintenance link and extended OAM messages for querying the status.
  • the extended OAM message definition is as shown in Table 2 below, in order to configure a table of extended OAM packet frame formats for maintaining the data packet transmission period of the link.
  • the implementation that the OLT periodically sends the data packet for maintaining the link to the ONU during the ONU snoring can be achieved by, but not limited to, the following:
  • Manner 1 Set a timer or counter inside the OLT. The timer expires or the counter reaches a certain value to trigger the OLT to send a data packet to maintain the link to the ONU.
  • Manner 2 The OLT is controlled by the service module to deliver data packets for maintaining the link.
  • Manner 3 The OLT is controlled by the message from the upper device and sends the data packet for maintaining the link.
  • Embodiment 4 Maintaining MPCP in a sleep mode by adjusting the frequency of sending MPCP packets
  • the ONU process of the protocol link is used to ensure that the MPCP protocol maintains the link mechanism in normal operation by adjusting the frequency of sending MPCP packets in the sleep mode.
  • the flow of this embodiment is similar to the flow of the first embodiment. The difference is that the transmission frequency needs to be adjusted in this embodiment, but the transmission frequency is fixed in the first embodiment.
  • Step 401 The EPON ONU starts the power saving mode, and adjusts the frequency of the GATE frame sent to maintain the link to once every 200 ms.
  • the MPCP state machine on the OLT sends a GATE frame to the ONU every 200ms.
  • Step 402 The ONU enters the sleep mode and turns off the sending and receiving functions of the optical module.
  • Step 403 The ONU starts the timer T while entering the sleep mode, and the timeout period is 200ms.
  • Step 404 The ONU receives the GATE frame from the OLT after the timer expires.
  • Step 405 If there is no upstream traffic, send an empty REPORT frame to the OLT within the time slot specified by the GATE frame; return to step 402.
  • Step 406 If there is uplink traffic, the corresponding REPORT frame is sent according to the rules of the DBA. Go back to step 402.
  • the manner in which the ONU obtains the timer T timeout period includes but is not limited to the following two types:
  • the OLT sends the OAM message to the ONU through the extended OAM message.
  • Table 2 shows the extended OAM message.
  • Mode 2 The ONU is obtained according to the length of the wakeup period.

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Abstract

本发明公开了一种以太网无源光网络节能状态下维持链路的方法的两套方案，其中一套方案包括：光网络单元（ONU）根据默认睡眠周期或光线路终端（OLT）配置的睡眠周期在节能状态周期性苏醒；周期性苏醒时接收和发送用于维持链路的数据帧。本发明还公开了一种以太网无源光网络节能状态下维持链路的***的两套方案，其中一套方案***中的配置单元用于OLT为ONU配置睡眠周期；链路维持单元用于ONU根据默认睡眠周期或OLT配置的睡眠周期在节能状态周期性苏醒时，通过接收和发送用于维持链路的数据帧实现链路维持。采用本发明的方法及***，能在节能状态下实现链路维持。

Description

一种以太网无源光网络节能状态下维持链路的方法及*** 技术领域
本发明涉及以太网无源光网络 ( EPON , Ethernet Passive Optical Network )领域， 尤其涉及一种 EPON***中在节能状态下维持链路的方法 及***。 背景技术
1G-EPON和 10G-EPON分别^ ^于 IEEE802.3-2005 Section 5和 IEEE 802.3av标准的新一代宽带无源光综合接入技术， ***通常由局侧的光线路 终端 （OLT, Optical Line Terminal ), 用户侧的光网络单元（ONU, Optical Network Unit ) /光网络终端 （ONT, Optical Network Termination ), 和光分 配网络（ODN, Optical Distribution Network )组成， 如图 1所示。 其中， ODN由单模光纤和光分路器、 光连接器等无源光器件组成， ODN为 OLT 与 ONU/ONT之间的物理连接提供光传输媒质。 ODN通常为点到多点结构， 即一个 OLT连接多个 ONU。
IEEE802.3-2005 Section 5 Clause 64.3中规定了一种链路维持机制。 以 用户侧终端为 ONU为例， 对每个处于已注册（registered )状态的 ONU, OLT 若在 50ms 时间内没有向该 ONU发送选通（GATE ) 多点控制协议 ( MPCP )报文， 则向该 ONU发送一个空的 GATE MPCP报文； OLT若在 1秒内没有收到其发送的报告（ REPORT ) MPCP报文，则认为 OLT与 ONU 间发生了链路严重错误， 将 OLT 自身内部和该 ONU对应的状态机迁移到 去注册（deregistered )状态， 然后重新发起该 ONU的注册过程。 处于已注 册状态的 ONU, 若在 50ms内没有向 OLT发送 REPORT MPCP报文， 则向 OLT发送一个空的 REPORT MPCP报文。 ONU若在 1秒内没有收到 OLT 发给自己的 GATE MPCP报文， 则认为发生了链路严重错误， 迁移到看门 狗超时（ WATCHDOG TIMEOUT )状态， 然后重新进行注册过程。 由上述 规则可以看出， 对于处于已注册状态的 ONU而言， OLT需要以最长 50ms 的间隔向 ONU发送 4艮文， 同样 ONU也需要以最长 50ms的间隔向 OLT发 送报文。
一些业务层的协议也有链路维持机制。 如互联网组管理协议（IGMP, Internet Group Management Protocol )协议， 每隔一定时间， 服务器会向用 户发送 IGMP查询（ QUERY )协议帧，用户必须返回 IGMP报告 ( REPORT ) 协议帧。 如果服务器在一定时间内没有收到 IGMP REPORT响应， 会认为 用户已经不再需要该组播流， 会停止向用户发送组播数据。
EPON***处于节能状态时， ONU的接收和发送都关闭， 或者发送关 闭。 由于现有技术需要在 ONU与 OLT之间互相发送维持链路的数据帧， 来实现链路维持机制， 而在节能状态下无法发送数据帧 （包括维持链路的 数据帧也不能正常发送）， 因此， 实际上在节能状态下仍然釆用现有技术， 是无法实现链路维持机制的，在这种情况下有可能出现 ONU被解注册或者 业务级链接中断的问题。 然而节能的要求是不能影响业务和 ONU的注册， 因此， 在节能状态下如何维持链路成为了一个待解决的问题， 目前尚未存 在有效的解决方案。 发明内容
有鉴于此， 本发明的主要目的在于提供一种以太网无源光网络节能状 态下维持链路的方法及***， 能在节能状态下实现链路维持。
为达到上述目的， 本发明的技术方案是这样实现的：
一种以太网无源光网络节能状态下维持链路的方法， 该方法包括： 光 网络单元（ONU )根据默认睡眠周期或光线路终端 （OLT ) 配置的睡眠周 期在节能状态周期性苏醒； 周期性苏醒时接收和发送用于维持链路的数据 帧。
其中， 所述 OLT为所述 ONU配置所述睡眠周期的方式包括： OLT扩 展操作管理维护（OAM )消息， 将配置的所述睡眠周期加入扩展后的 OAM 消息中， 并下发给 ONU。
其中， 所述默认睡眠周期或配置的睡眠周期小于***要求维持链路的 数据帧的最大发送时间间隔。
其中， 所述周期性苏醒的实现方式包括： 通过定时器或计数器超时后 触发的方式、 或 ONU响应 OLT消息的方式。
一种以太网无源光网络节能状态下维持链路的***， 该***包括： 配 置单元和第一链路维持单元； 其中，
配置单元， 用于 OLT为 ONU配置睡眠周期；
第一链路维持单元， 用于 ONU根据默认睡眠周期或 OLT配置的睡眠 周期在节能状态周期性苏醒时， 通过接收和发送用于维持链路的数据帧实 现链路维持。
其中， 所述配置单元， 进一步用于通过 OLT扩展 OAM消息， 将配置 的所述睡眠周期加入扩展后的 OAM消息中， 并下发给 ONU的方式， 实现 所述 OLT为所述 ONU配置所述睡眠周期。
其中， 所述默认睡眠周期或配置的睡眠周期小于***要求维持链路的 数据帧的最大发送时间间隔。
一种以太网无源光网络节能状态下维持链路的方法， 该方法包括： 设 置 ONU与 OLT之间用于维持链路的协议报文或数据包的发送频率； 发送 用于维持链路的协议报文或数据包时， 按照设置的发送频率使发送时间间 隔大于或等于 ONU的睡眠周期。
其中， 该方法还包括： 由 OLT通过扩展 OAM消息设置所述发送时间 间隔、 或由 ONU根据睡眠周期调整所述发送时间间隔。 一种以太网无源光网络节能状态下维持链路的***， 该***包括： 设 置单元和第二链路维持单元； 其中，
设置单元， 用于设置 ONU与 OLT之间用于维持链路的协议报文或数 据包的发送频率；
第二链路维持单元， 用于按照设置的发送频率使发送时间间隔大于或 等于 ONU的睡眠周期，通过发送用于维持链路的协议报文或数据包实现链 路维持。
其中， 所述第二链路维持单元， 进一步用于由 OLT通过扩展 OAM消 息设置所述发送时间间隔、 或由 ONU根据睡眠周期调整所述发送时间间 隔。
本发明有两套方案，其中一套方案包括： ONU根据默认睡眠周期或 OLT 配置的睡眠周期在节能状态周期性苏醒； 周期性苏醒时接收和发送用于维 持链路的数据帧。
釆用本发明， 由于存在睡眠周期， 即便处于节能状态下， 也可以根据 睡眠周期在节能状态下周期性苏醒， 能接收和发送用于维持链路的数据帧， 从而实现在节能状态下的链路维持机制。 附图说明
图 1为现有技术的 EPON网络基本结构示意图；
图 2为本发明实施例一的在睡眠模式下为维持 MPCP协议链路的 ONU 的流程图；
图 3 为本发明实施例二的在睡眠模式下为维持业务层协议的链路的 ONU的流程图。 具体实施方式
本发明的基本思想是： 本发明有两套方案， 其中一套方案包括： ONU 才艮据默认睡眠周期或 OLT配置的睡眠周期在节能状态周期性苏醒； 周期性 苏醒时接收和发送用于维持链路的数据帧。
下面结合附图对技术方案的实施作进一步的详细描述。
一种以太网无源光网络节能状态下维持链路的方法， 该方法主要包括 以下两方面内容：
第一方面： ONU根据默认睡眠周期或 OLT配置的睡眠周期在节能状态 周期性苏醒； 周期性苏醒时接收和发送用于维持链路的数据帧。
进一步的， OLT为 ONU配置睡眠周期的方式包括： OLT扩展 OAM消 息， 并将配置的睡眠周期加入扩展后的 OAM消息中， 并下发给 ONU。 其 中, 所述 0 AM是 Operation、 Administraion& Maintenance的缩写, 指操作、 管理与维护。
进一步的， 默认睡眠周期或配置的睡眠周期要小于***要求维持链路 的数据帧的最大发送时间间隔。
进一步的， 周期性苏醒的实现方式包括： 通过定时器或计数器超时后 触发的方式、 或 0NU响应 0LT消息的方式。
进一步的， 所述节能状态包括睡眠模式、 或打盹模式等多种实现方式。 其中， 所述睡眠模式指： 0NU的接收和发送都关闭的情况； 所述打盹模式 指： ONU的发送关闭， 而 ONU的接收是打开的情况。
对应上述实现方案， 一种以太网无源光网络节能状态下维持链路的系 统， 该***包括： 配置单元和第一链路维持单元。 其中， 配置单元用于 0LT 为 0NU配置睡眠周期； 第一链路维持单元用于 0NU根据默认睡眠周期或 0LT 配置的睡眠周期在节能状态周期性苏醒时， 通过接收和发送用于维持 链路的数据帧实现链路维持。
这里， 配置单元进一步用于通过 0LT扩展 0AM消息， 将配置的睡眠 周期加入扩展后的 0AM消息中，并下发给 0NU的方式，实现 0LT为 0NU 配置睡眠周期。
这里， 默认睡眠周期或配置的睡眠周期小于***要求维持链路的数据 帧的最大发送时间间隔。
第二方面： 设置 ONU与 OLT之间用于维持链路的协议报文或数据包 的发送频率； 发送用于维持链路的协议报文或数据包时， 按照设置的发送 频率使发送时间间隔大于或等于 ONU的睡眠周期。
进一步的， 发送时间间隔可以由 OLT通过扩展 OAM消息设置， 也可 以由 ONU根据睡眠周期来调整。从而保证 ONU和 OLT之间发送的数据包 可以满足维持链路的要求。
这里需要指出的是： 本文涉及的睡眠周期并不限于目前的描述， 只要 能实现该睡眠周期功能的描述都在本发明的保护范围内， 比如唤醒周期、 唤醒时间间隔等等。
对应上述实现方案， 一种以太网无源光网络节能状态下维持链路的系 统， 该***包括： 设置单元和第二链路维持单元。 其中， 设置单元用于设 置 ONU与 OLT之间用于维持链路的协议报文或数据包的发送频率； 第二 链路维持单元用于按照设置的发送频率使发送时间间隔大于或等于 ONU 的睡眠周期， 通过发送用于维持链路的协议报文或数据包实现链路维持。
这里， 第二链路维持单元进一步用于由 OLT通过扩展 OAM消息设置 发送时间间隔、 或由 ONU根据睡眠周期调整发送时间间隔。
综上所述， 本发明是一种在节能状态下实现链路维持机制的方案， 一 方面能够满足***节能的需要， 在睡眠或者打盹时间内可以关闭光模块的 接收和 /或发送， 以达到节能的目的。 同时配合媒体接入控制（MAC层）和 业务层的链路维持机制， 避免出现 ONU解注册或业务断链的情况。
以下对本发明进行举例阐述。
实施例一： 在睡眠模式下为维持 MPCP协议链路的 ONU的流程，用于 在睡眠模式下保证 MPCP协议的维持链路机制正常运行。 需要指出的是， 本文涉及 MPCP协议的都是针对 MAC层的链路维持机制， 不作赘述。
如图 2所示的流程， 包括以下步骤：
步骤 101 : EPON***的 ONU启动节能方式。
步骤 102: ONU 进入睡眠模式， 关闭光模块的发送和接收功能。
步骤 103: ONU在进入睡眠模式的同时启动定时器 T。
步骤 104: 判断定时器 Τ是否超时， 如果是， 则执行步骤 105; 否则， 等待， 继续判断定时器 Τ是否超时。
步骤 105: ONU在定时器 Τ超时后， 接收来自 OLT的 GATE帧。
步骤 106: 判断是否有上行流量， 如果是， 则执行步骤 107; 否则， 执 行步骤 108。
步骤 107: 如果有上行流量， 则按照动态带宽分配 （DBA, Dynamic Bandwidth Allocation )的规则发送相应的 REPORT帧， 以达到为 ONU分配 上行带宽的目的； 之后执行步骤 102。
步骤 108: 如果没有上行流量， 则在 GATE帧规定的时隙内向 OLT发 送空的 REPORT帧， 该空的 REPORT帧即为用于维持链路的数据帧； 之后 执行步骤 102。
这里， 本实施例中， 定时器 T 的超时时间应该小于 OLT规定的最大 REPORT帧接受间隔， 可以将定时器 T的值默认设置为 50ms。
这里， 本实施例中， OLT可以通过扩展 OAM消息配置定时器 T的值。 扩展 OAM消息的格式如表 1所示，为配置睡眠周期的扩展 OAM包帧格式 的表。
Octet(s) Field Notes
1 Branch ( 0XC9 ) 扩展的操作
2 Leaf (待定） 配置 ONU在睡眠方式下睡眠周期的通知消息
1 Variable Width 用于指示 Variable值字段长度时， 其值为 04 4 睡眠周期 标识 ONU在睡眠模式中保持的时间， 单位是时间定量
( TQ , Time Quantum )
表 1
表 1 中的 Octet(s)表示字节； Branch表示变量部； Leaf表示变量页； Variable Width表示变量宽度。
实施例二： 在睡眠模式下为维持业务层协议的链路的 ONU的流程， 用 于在睡眠模式下保证业务层协议的维持链路机制正常运行。
因为如果 MPCP的维持链路机制用除上述实施例一外的其他方法进行 链路维持，或者***釆取了关闭 MPCP定时器，干预 MPCP状态机的方式，
能正常运行， 则 PON***仅需保证业务层协议的维持链路机制正常运行。
如图 3所示的流程， 包括以下步骤：
步骤 201： EPON***的 ONU启动节能方式。
步骤 202: ONU进入睡眠模式， 关闭光模块的发送和接收功能。
步骤 203: ONU在进入睡眠模式的同时启动定时器 T。
步骤 204: 判断定时器 Τ是否超时， 如果是， 则执行步骤 205; 否则， 等待， 继续判断定时器 Τ是否超时。
步骤 205: ONU在定时器 Τ超时后， 接收来自 OLT的 GATE帧。
步骤 206: ONU在 GATE帧规定的时隙内发送用于维持链路的上行协 议帧； 之后执行步骤 202。
这里，本实施例中， OLT应该在定时器超时之前向 ONU发送 GATE帧， 保证 ONU的上行协议帧能够发送。
这里， 本实施例中， 定时器 T的超时时间应该小于协议规定的最大维 持链路帧接受间隔。 对于不同的协议， 定时器 T的默认值不同， 可以将定 时器 T的值默认设置为 50ms。
这里， 本实施例中， OLT可以通过扩展 OAM消息配置定时器 T的值。 扩展 OAM的格式如上述表 1所示。
实施例三： 针对打盹模式而言， 釆用 ONU响应 OLT消息的方式， 用 于在打盹模式下保证 MPCP协议和其他协议的维持链路机制正常运行。 本 实施例的流程包括以下步骤：
步骤 301 : EPON ONU启动节能方式， 进入打盹模式， 关闭光模块的 发送功能。
步骤 302: OLT在 ONU打盹期间定期发送用于维持链路的数据包给 0而。
步骤 303: ONU在打盹模式期间对来自 OLT的要求 ONU响应的链路 维持数据包时暂时打开 ONU的数据发送， 进行响应。
这里， 维持链路数据包包括 MPCP维持链路的报文和用于查询状态的 扩展 OAM消息两种。 扩展 OAM消息定义如以下表 2所示， 为配置维持链 路的数据包发送周期的扩展 OAM包帧格式的表。
Figure imgf000011_0002
Figure imgf000011_0001
这里， OLT在 ONU打盹期间定期发送用于维持链路的数据包给 ONU 的实现可以通过但不限于以下方式：
方式一： 在 OLT的内部设置定时器或计数器， 定时器超时或计数器到 达某个数值触发 OLT发送维持链路的数据包给 ONU。
方式二： OLT受业务模块控制下发用于维持链路的数据包。
方式三： OLT 受来自上层设备的消息控制， 下发用于维持链路的数据 包。
实施例四：在睡眠模式下用调整 MPCP报文发送频率的方式维持 MPCP 协议链路的 ONU的流程，用于在睡眠模式下，用调整 MPCP报文发送频率 的方式保证 MPCP协议的维持链路机制正常运行。 本实施例的流程类似于 上述实施例一的流程， 区别在于本实施例需要调整发送频率， 而上述实施 例一不需要， 发送频率是固定的。
本实施例的流程包括以下步骤：
步骤 401 : EPON ONU启动节能方式， 并将发送用于维持链路的 GATE 帧的频率调整到每 200ms一次。 OLT上的 MPCP状态机每隔 200ms发送一 个 GATE帧到 ONU。
步骤 402: ONU 进入睡眠模式， 关闭光模块的发送和接收功能。
步骤 403 : ONU 在进入睡眠模式的同时启动定时器 T, 超时时间为 200ms。
步骤 404: ONU在定时器超时后接收来自 OLT的 GATE帧。
步骤 405: 如果没有上行流量， 则在 GATE帧规定的时隙内向 OLT发 送空的 REPORT帧； 回到步骤 402。
步骤 406: 如果有上行流量， 则按照 DBA的规则发送相应的 REPORT 帧。 回到步骤 402。
在本实施例中， ONU获得定时器 T超时时间的方式包括但不限于以下 两种：
方式一、 OLT通过扩展 OAM消息发送给 ONU, 扩展 OAM消息如表 2所示。
方式二、 ONU根据唤醒周期长度获取。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种以太网无源光网络节能状态下维持链路的方法， 其特征在于， 该方法包括： 光网络单元（ONU )根据默认睡眠周期或光线路终端（OLT ) 配置的睡眠周期在节能状态周期性苏醒； 周期性苏醒时接收和发送用于维 持链路的数据帧。
2、 根据权利要求 1所述的方法， 其特征在于， 所述 OLT为所述 ONU 配置所述睡眠周期的方式包括： OLT扩展操作管理维护 （OAM ) 消息， 将 配置的所述睡眠周期加入扩展后的 OAM消息中， 并下发给 ONU。
3、 根据权利要求 1或 2所述的方法， 其特征在于， 所述默认睡眠周期 或配置的睡眠周期小于***要求维持链路的数据帧的最大发送时间间隔。
4、 根据权利要求 1所述的方法， 其特征在于， 所述周期性苏醒的实现 方式包括： 通过定时器或计数器超时后触发的方式、 或 ONU响应 OLT消 息的方式。
5、 一种以太网无源光网络节能状态下维持链路的***， 其特征在于， 该***包括： 配置单元和第一链路维持单元； 其中，
配置单元， 用于 OLT为 ONU配置睡眠周期；
第一链路维持单元， 用于 ONU根据默认睡眠周期或 OLT配置的睡眠 周期在节能状态周期性苏醒时， 通过接收和发送用于维持链路的数据帧实 现链路维持。
6、 根据权利要求 5所述的***， 其特征在于， 所述配置单元， 进一步 用于通过 OLT扩展 OAM消息，将配置的所述睡眠周期加入扩展后的 OAM 消息中， 并下发给 ONU的方式， 实现所述 OLT为所述 ONU配置所述睡眠 周期。
7、 根据权利要求 5或 6所述的***， 其特征在于， 所述默认睡眠周期 或配置的睡眠周期小于***要求维持链路的数据帧的最大发送时间间隔。
8、 一种以太网无源光网络节能状态下维持链路的方法， 其特征在于， 该方法包括： 设置 ONU与 OLT之间用于维持链路的协议报文或数据包的 发送频率； 发送用于维持链路的协议报文或数据包时， 按照设置的发送频 率使发送时间间隔大于或等于 ONU的睡眠周期。
9、 根据权利要求 8所述的方法， 其特征在于， 该方法还包括： 由 OLT 通过扩展 OAM消息设置所述发送时间间隔、 或由 ONU根据睡眠周期调整 所述发送时间间隔。
10、 一种以太网无源光网络节能状态下维持链路的***， 其特征在于， 该***包括： 设置单元和第二链路维持单元； 其中，
设置单元， 用于设置 ONU与 OLT之间用于维持链路的协议报文或数 据包的发送频率；
第二链路维持单元， 用于按照设置的发送频率使发送时间间隔大于或 等于 ONU的睡眠周期，通过发送用于维持链路的协议报文或数据包实现链 路维持。
11、 根据权利要求 10所述的***， 其特征在于， 所述第二链路维持单 元， 进一步用于由 OLT通过扩展 OAM消息设置所述发送时间间隔、 或由 ONU根据睡眠周期调整所述发送时间间隔。
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