WO2007033602A1 - Procede pour le fonctionnement d'un terminal utilisateur de reseau optique passif et terminal utilisateur de reseau optique passif - Google Patents

Procede pour le fonctionnement d'un terminal utilisateur de reseau optique passif et terminal utilisateur de reseau optique passif Download PDF

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Publication number
WO2007033602A1
WO2007033602A1 PCT/CN2006/002485 CN2006002485W WO2007033602A1 WO 2007033602 A1 WO2007033602 A1 WO 2007033602A1 CN 2006002485 W CN2006002485 W CN 2006002485W WO 2007033602 A1 WO2007033602 A1 WO 2007033602A1
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WIPO (PCT)
Prior art keywords
user terminal
optical network
passive optical
saving state
network user
Prior art date
Application number
PCT/CN2006/002485
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English (en)
French (fr)
Inventor
Hai Gao
Yong He
Original Assignee
Huawei Technologies Co., Ltd.
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
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to AT06791075T priority Critical patent/ATE452472T1/de
Priority to EP06791075A priority patent/EP1940051B1/en
Priority to DE602006011194T priority patent/DE602006011194D1/de
Publication of WO2007033602A1 publication Critical patent/WO2007033602A1/zh
Priority to US12/052,531 priority patent/US8014674B2/en

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Classifications

    • 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
    • H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
    • 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

Definitions

  • the present invention relates to the field of passive optical network technologies, and in particular, to a method for operating a passive optical network user terminal and a passive optical network user terminal. Background of the invention
  • PON technology mainly includes APON (ATM Based PONs), EPON (Ethernet Based PONs), and GPON (Gigabit PONs). That is gigabit passive optical network) and so on.
  • the broadband access technology of Passive Optical Network has the following advantages:
  • Passive optical networks do not have any active devices from the central switching office to the customer premises network. Instead, passive optical components are inserted into the network and the transmitted traffic is directed over the entire path by separating the power of the optical wavelengths. . This replacement eliminates the need for service providers to power and maintain active devices in the transmission loop, which greatly reduces the cost of the service provider. Passive splitters and couplers only function to transmit and limit light, do not require power and information processing, and have Unrestricted Mean Time Between Failure (MTBF) can reduce service provider maintenance costs.
  • MTBF Mean Time Between Failure
  • the passive optical network is usually composed of an optical line terminal (OLT) at the central office (CO) and a series of optical network units (ONUs) located at the customer premises.
  • OLT optical line terminal
  • ONUs optical network units
  • An optical distribution network (ODN) consisting of a source splitter or coupler.
  • ODN optical distribution network
  • a single fiber can be pulled from the service switching office to a broadband service sub-area or office park, and then a passive optical splitter or coupling
  • the device separates several branches from the main fiber into various buildings or business equipment. This approach allows multiple users to share the relatively expensive fiber link from the exchange to the customer premises, thereby significantly reducing the cost of fiber-to-the-building (FTTB) and fiber-to-the-home (FTTH).
  • FTTB fiber-to-the-building
  • FTTH fiber-to-the-home
  • BPON Broadband Passive Optical Network
  • EPON or GPON technology By using APON, BPON (Broadband Passive Optical Network), EPON or GPON technology to be standardized, 155Mbit/s, 622Mbit/s, 1.25Gbit/s or 2.5Gbit/s can be supported on the PON backbone fiber.
  • BPON Broadband Passive Optical Network
  • EPON or GPON technology By using APON, BPON (Broadband Passive Optical Network), EPON or GPON technology to be standardized, 155Mbit/s, 622Mbit/s, 1.25Gbit/s or 2.5Gbit/s can be supported on the PON backbone fiber.
  • the PON technology uses the TDMA (Time Division Multiple Access) technology on the uplink, and the central office equipment OLT performs time window authorization for each ONU in the network, that is, authorizes different ONUs to send uplinks in different time periods. Data, so that the uplink data of different ONUs will not conflict. Therefore, the optical module device of the ONU terminal is controlled by the PON protocol to intermittently turn on and off the transmission function of the optical module (so-called "bursty" transmission). The receiving function of the ONU terminal optical module is always open, which facilitates the ONU to receive time period authorization information from the OLT.
  • TDMA Time Division Multiple Access
  • the message frame that the OLT sends the time window authorization to the ONU usually contains two pieces of information, which allows the ONU to open the start time sent by the optical module and allow the ONU to open the duration of the optical module transmission.
  • the OLT dynamically allocates the authorization time window of each ONU according to the bandwidth requirements of each ONU, so that the bandwidth of each OJ can be dynamically changed and conforms to the preset bandwidth policy. This calculation and scheduling process is called DBA (Dynamic Bandwidth Allocation) algorithm.
  • the OLT can set an ONU through the DBA algorithm.
  • the mode of the authorization time window such as the timed loop mode.
  • the service supported by the ONU is multi-service. Some of the services are running in the low-speed connection state for a long time, and the occupied bandwidth is small (for example, the Keep Alive of the terminal and the central office maintains an active mechanism in the VoIP service).
  • the current ONU terminal keeps running for a long time, and the energy consumed during the operation is fixed. It does not have the ability to automatically adjust the power consumption. When long-term operation requires only low-power consumption, a large amount of energy is wasted. .
  • Energy consumption includes three aspects: the attenuation of the central office equipment, the terminal equipment, and the intermediate ODN network.
  • the consumption of the central office and the terminal is obvious, which is caused by the operation of the device.
  • the consumption of the intermediate ODN network is small because the laser is attenuated in the optical fiber.
  • the technical problem to be solved by the present invention is to overcome the problem that the existing passive optical network cannot automatically adjust the energy consumption, and avoid the phenomenon that a large amount of energy is wasted when only low-power services are run for a long time.
  • the method for operating a passive optical network user terminal provided by the invention enables the passive optical network user terminal to automatically adjust the energy consumption to save energy.
  • the passive optical network user terminal detects whether the state of the user meets the judgment condition of entering the energy-saving state, and when the judgment condition is met, sends a request for entering the energy-saving state to the optical line terminal;
  • the passive optical network user terminal controls the internal part module to enter the power saving state, and intermittently switches between the energy saving state and the normal state.
  • the decision condition for entering the energy-saving state is a traffic threshold or an activity indication of the service port; And the process of determining that the judgment condition is met includes:
  • the passive optical network user terminal periodically detects the service traffic, and enters the energy-saving state judgment according to the traffic threshold and the detected service traffic;
  • the passive optical network user terminal performs an interrupt trigger according to the activity indication of the passive optical network service port, and judges to enter the energy saving state.
  • the passive optical network user terminal sends a request message to the optical line terminal to enter the energy-saving state, where the request message includes a power-saving state parameter, and if the optical line terminal accepts the request, the passive optical network user terminal is set according to the energy-saving state parameter.
  • the dynamic bandwidth allocation policy enables the authorized time window allocated to the passive optical network user terminal to be in a normal state period; if the optical line terminal does not accept the request or does not respond to the request, the passive optical network user terminal does not enter the power saving state.
  • the energy-saving state parameter includes a power-saving state running time and a normal state running time, and the passive optical network user terminal wakes up and sleeps according to the running time timing, and the passive optical network user terminal operates normally in a normal state, the passive optical network user terminal
  • the data of the low-speed service connection is transmitted between the optical line terminal and the optical line terminal; in the sleep state, the passive optical network user terminal turns off or reduces the power consumption of some modules, and does not send data to the optical line terminal.
  • the central processing module enters a partial sleep state by utilizing the low power mode of the central processing module in the passive optical network user terminal.
  • the modules are put into a power-saving state; or the power switch is set to the relevant module in the passive optical network user terminal, so that the central processing module in the passive optical network user terminal passes Controlling the opening and closing of the power switch to switch the corresponding module between a normal state and a power saving state.
  • the control optical module and the passive optical network protocol processing module are in a power-saving state, so that the passive optical network user terminal cannot transmit uplink and downlink data in the energy-saving state, thereby saving power consumption of the optical module and the passive optical network protocol processing module; or controlling The optical module and the part of the passive optical network protocol processing module are in a power-saving state, so that the passive optical network user terminal can receive the downlink data packet from the optical line terminal in the energy-saving state.
  • the user terminal of the passive optical network detects its own state in a power-saving state, and when it finds that its state does not meet the energy-saving decision condition, it exits from the energy-saving state and resumes the normal working state.
  • the passive optical network user terminal receives the information sent by the optical line terminal, and when receiving the information indicating that the power-saving state is exited, exits from the energy-saving state and resumes the normal working state.
  • the user equipment When the user terminal of the passive optical network is ready to exit the energy-saving state in the energy-saving state, the user equipment sends a request message for exiting the energy-saving state to the light-path terminal, and requests to restore the bandwidth during normal operation.
  • the invention also provides a passive optical network user terminal device, wherein the passive optical network user terminal device is provided with a detection decision module, a communication module and a control module;
  • the detection decision module is configured to: detect a state of the user terminal of the passive optical network, and determine whether the detected state meets the judgment condition of entering the energy-saving state, and notify the communication module when determining that the detected state meets the judgment condition;
  • the communication module after receiving the notification, sends a request for entering the energy-saving state to the optical line terminal; and the control module: after the passive optical network user terminal receives the response of the optical line terminal accepting the request, controlling the internal part of the passive optical network user terminal The module enters a power saving state.
  • the beneficial effects of the present invention are as follows:
  • the present invention provides a method for operating a passive optical network user terminal and a passive optical network user terminal, which saves energy while maintaining a low speed connection, and saves passive optical network user terminal equipment.
  • Power consumption when long-running requires only low-bandwidth services (such as voice);
  • the present invention defines a power-saving state for a passive optical network user terminal device, and provides a condition of state transition, such that the passive optical network user terminal device has The capability of dynamically adjusting the power consumption according to the service bandwidth, for example, when only a low-speed connection or a one-way connection is required, the passive optical network user terminal enters a power-saving state, which reduces power consumption; when the user service requires a large bandwidth, the ONU terminal enters a normal state. , power consumption returns to normal.
  • the invention mainly considers the energy saving of the terminal device, and the terminal device has a large amount of coverage, so that the energy saving effect of the invention can be significantly improved, and the energy saving solution of the invention can support the service when the terminal device is equipped with the backup battery and the AC power grid is powered off.
  • Longer time Due to the passive optical network user terminal because It takes 24 hours to turn on the wall or external telephone. If it is not energy-saving, the energy consumption is very large. Set a terminal to operate at 15-30W for 24 hours. If it can save half of energy, it will achieve considerable energy saving effect.
  • the invention saves energy consumption while keeping the low-speed service uninterrupted, and at the same time reduces the pressure of the thermal design of the passive optical network user terminal.
  • Figure 1 is a schematic structural diagram of a PON system
  • FIG. 2 is a logical structural diagram of a user terminal of a passive optical network according to an embodiment of the present invention
  • Figure 3 is a running time distribution diagram in a normal state
  • FIG. 5 is a schematic diagram of a running process of a passive optical network user terminal according to an embodiment of the present invention. Mode for carrying out the invention
  • the present invention provides an energy-saving scheme for a network user terminal device of a PON system, which saves power consumption of a passive optical network user terminal device when a long-running operation requires only a low-bandwidth service (such as voice).
  • the present invention is a passive optical network user terminal.
  • the device defines the power saving state and provides conditions for the state transition.
  • the passive optical network user terminal ie, ONU
  • the method provided by the present invention mainly includes the following steps:
  • the passive optical network user terminal detects whether the state is in compliance with the decision condition of entering the energy-saving state, and sends a request to enter the energy-saving state to the optical line terminal when it is determined that the detected state meets the decision condition of entering the energy-saving state.
  • the source optical network user terminal controls the internal part of the module to enter a power saving state, and intermittently switches between the energy saving state and the normal state.
  • the passive optical network user terminal does not receive the response of the optical line terminal accepting the request, or receives the response of the optical line terminal rejecting the request to enter the power saving state, the passive optical network user terminal does not enter the energy saving state and continues to operate normally. .
  • each module inside the passive optical network user terminal is designed with a control switch, through which the working state of each module can be controlled.
  • the terminal device enters a power-saving state, that is, each module in the passive optical network user terminal device, except for necessary modules such as a module for monitoring data flow, and the like.
  • the module enters the periodic periodic wake and sleep, that is, enters the energy saving state.
  • the decision condition for entering the energy-saving state may adopt a traffic threshold or an activity indication of the service port, and the passive optical network user terminal periodically performs the detection of the energy-saving state decision condition, or performs an interrupt trigger according to the activity indication of the passive optical network user terminal, and detects the real-time. Whether the state of its own meets the judgment condition of entering the energy-saving state.
  • the passive optical network user terminal can use the existing traffic counter of the service processing component or the activity indication of the service port to detect, for example, the data exchange chip has traffic count and service data type statistics, and the telephone interface module can detect whether the user picks up the phone, CATV The interface module can detect whether the TV is turned on or the like.
  • the decision condition for entering the energy-saving state may be set in the CPU software of the passive optical network user terminal, such as setting the traffic threshold of the service interface state (such as whether the phone is off-hook, etc.) or the data port (such as the Ethernet port) in the CPU software. .
  • the passive optical network user terminal initiates the process of entering the energy saving state.
  • the decision condition for entering the energy-saving state may be built in the terminal device software, or may be sent by the central office network management to the passive optical network user terminal, or may be set by the user of the terminal device, and the decision condition in the passive optical network user terminal Can be modified.
  • the passive optical network user terminal can detect its own state by using a timing inquiry mechanism or an interrupt triggering mechanism, and the timing inquiry mechanism detects by setting a time timing; the interrupt triggering mechanism uses a telephone interface module to detect whether the user picks up the phone or the CATV interface module detects Whether the TV is turned on or not The interrupt notifies the CPU to process and detects it in real time.
  • FIG 2 briefly depicts the module structure of a passive optical network user terminal.
  • the passive optical network user terminal in Figure 2 includes a module that can completely enter hibernation, a module that cannot enter hibernation, and a module that can enter half-sleep.
  • the solid arrow is the data stream
  • the dashed arrow is the control flow
  • the blank box is the module that cannot sleep, such as the power supply and clock module
  • the box with the full shadow is the module that can sleep, such as optical module, PON protocol Processing module, data forwarding module, service module, etc.
  • a box with half blank and half shadow is a module that can enter half sleep, that is, a module that needs to retain certain functions when entering sleep, such as a CPU module.
  • These sleepable modules can take advantage of the existing energy-saving features of the chip when they are specifically designed to enter sleep control (some chips can control their chips into low-power mode through pins or registers), or design a power switch (power switch) Using a thyristor or relay, etc., the CPU controls the power switch through software. When the power switch is turned off, the power of the sleepable module is turned off to reduce the power consumption of the passive optical network user terminal.
  • the CRJ in the passive optical network user terminal can enter a partial sleep state.
  • Most general-purpose CPUs PowerPC, Intel IA32, ARM. MIPS, etc.
  • the CPU can actively enter its set Snap, Sleep and other modes. In these modes, the CPU can still maintain some functions. , but CPU power consumption is significantly reduced.
  • the CPU can exit from these low power modes and return to normal mode.
  • the CPU obtains the status information of each service module through the control bus in FIG. 1 to make energy-saving condition determination; the CPU also controls the low-power mode of each service module through the control bus, or directly controls the power supply to control the service module to enter the shutdown mode. .
  • the CPU In the power-saving state, the CPU only keeps interrupts and monitors thread operations, maintaining a minimum business state detection task.
  • the process of entering the energy-saving state of the passive optical network user terminal is as follows:
  • the CPU sends a message packet to the central office OLT through the PON interface, requesting to enter the energy saving. Status, and negotiate the parameters of the timing connection with the central office OLT (normal running time tl, some modules enter the sleep or shutdown time t2, etc., as shown in Figure 4), their own energy-saving mode (such as the two energy-saving modes described later) An optional operating plan) and so on.
  • the central office OLT After receiving the request message of the passive optical network user terminal to enter the energy-saving state, the central office OLT sets the DBA policy of the passive optical network user terminal according to the timing connection parameter and the self-energy saving mode, so as to be allocated to the passive optical network.
  • the authorization time window of the user terminal is in the normal state period t1, and the central office OLT sends a response message to the passive optical network user terminal, indicating accepting or rejecting the request.
  • the passive optical network user terminal After receiving the response message of the request from the central office OLT, the passive optical network user terminal enters a power-saving state, and intermittently switches between a sleep state (ie, a power-saving state) and a normal state.
  • a sleep state ie, a power-saving state
  • the running time distribution diagram of the passive optical network user terminal in the normal state is shown in FIG. 3, and the running time distribution diagram of the passive optical network user terminal in the energy saving state of the present invention is shown in FIG. 4;
  • the passive optical network user terminal does not sleep in the normal state, and is always in the full power running state, which causes waste of energy when the data service is small;
  • the passive optical network user terminal of the present invention passes the intermittent Sexual transition between dormant state (ie, energy saving state) and normal state reduces energy consumption and saves energy.
  • the passive optical network user terminal continuously checks the status of each service module under the energy-saving state, and once it finds that the energy-saving judgment condition is not met, immediately exits from the energy-saving state and resumes the normal working state;
  • the source optical network user terminal receives various messages and data packets sent by the central office OLT in the energy-saving state period.
  • the user terminal Upon receiving the message that the local OLT indicates to exit the energy-saving state, the user terminal immediately exits from the energy-saving state and resumes the normal working state.
  • the passive optical network user terminal receives the service data packet from the external network in the energy-saving state, it judges according to the protocol, and when it needs to exit the energy-saving state, it immediately exits from the energy-saving state and resumes normal operation.
  • the user terminal of the passive optical network When the user terminal of the passive optical network is ready to exit the energy-saving state, the user terminal sends a request message for withdrawing the energy-saving state to the central office OLT, and needs to restore the bandwidth during normal operation; the central office OLT receives the transmission from the passive optical network user terminal. Request to enter a power saving status message or request to exit the energy saving The message is sent, and the message is analyzed and processed, and the response message is sent to the passive optical network user terminal. In the energy-saving state, the passive optical network user terminal can ensure the normal operation of certain services through the low-speed data connection, automatically wake up at regular intervals (through timers), and wake up the sleep related modules (including optical modules and PON protocols).
  • the processing module receives the message and the data packet transmitted by the central office OLT and processes the data.
  • the process of processing data packets may be to send data packets from the local port. Then, the passive optical network user terminal enters the sleep state again; or the passive optical network user terminal exits the energy-saving state according to the requirements of the central office OLT or other protocol packets (such as NGCP, SIP, and other NGN voice signaling), and returns to the normal state. Operating status.
  • the difference between the energy-saving state and the normal operation state of the passive optical network user terminal is as follows: In the energy-saving state, the passive optical network user terminal can transmit uplink data and downlink data in the time period of FIG. 4 . There are two solutions for the working state of the passive optical network user terminal in the t2 time period of Figure 4. The passive optical network user terminal can selectively implement one of the solutions and report it to the central office OLT device:
  • the optical module and the PON protocol processing module are turned off during the t2 time period, that is, all modules except the power supply and the clock module are turned off. In this way, the uplink and downlink data cannot be transmitted in the t2 time period.
  • the advantage of this scheme is that the power consumption of the optical module and the PON protocol processing module in the t2 time period can be saved.
  • the optical module is not turned off, and the PON protocol processing module is partially turned off.
  • the power supply and the clock module are not turned off, and other modules are turned off.
  • downlink data packets can be received from the central office OLT during the t2 time period.
  • the central OLT sets the DBA policy according to the energy-saving request of the user terminal of the passive optical network, so that the central OLT does not send the time window authorization to the passive optical network user terminal during the t2 time period, and the passive optical network user terminal cannot The uplink data packet is sent to the central office OLT during the t2 time period.
  • the passive optical network user terminal can receive the downlink message from the OLT at any time, so that any external call (such as a VoIP telephone call, etc.) can be immediately responded.
  • any external call such as a VoIP telephone call, etc.
  • the passive optical network user terminal will go to the central office OLT before entering the energy saving state.
  • the request message that enters the energy-saving state may include its own identification information, device version information, and the like, and may also include the t1 and t2 values, and may also include bandwidth information for applying for a low-speed connection, such as a low-speed connection bandwidth of 100 kps. Wait.
  • the central office OLT can issue a message requesting the passive optical network user terminal to exit the energy-saving state.
  • the message hangs the call under the passive optical network user terminal, and the external network plays a very significant role when calling the phone.
  • the central OLT can notify the passive optical network user terminal to exit the energy-saving state through this message, thereby waking up the passive optical network user terminal in time.
  • the OLT can also forward the voice signaling message to the user terminal of the passive optical network. In the process of processing the message, the user terminal of the passive optical network actively withdraws from the energy saving state according to the signaling requirement.
  • the value of U and t2 in Figure 4 is reported to the central office OLT by the user terminal of the passive optical network.
  • the central office OLT sets the DBA policy according to this parameter, so that the authorization window allocated to the user terminal of the passive optical network is basic and tl time period. If the optical module is closed, the user can send an uplink packet to the central office OLT in the authorization window.
  • the passive optical network user terminal equipment After the PON system is in normal operation, the passive optical network user terminal equipment requires only a small bandwidth and externally maintains a low-speed data connection (such as a VoIP module and when the user does not need to communicate (such as Internet access, download, on-demand, call, etc.).
  • the timing handshake information of the central switch, the serial port information of the transparent transmission and metering of the water and electricity gas, and the like, the bandwidth is less than 100 Kbps), and the time when some modules in the passive optical network user terminal are dormant will be long, and tl will be much smaller than t2.
  • t1 is one thousandth of t2
  • the passive optical network user terminal can obtain a maximum bandwidth of 1 Mbps.
  • the passive optical network user terminal can obtain a maximum bandwidth of 2.5 Mbps; It is equivalent to 0.1% of the power consumption of all modules in normal working state (the tl time period of normal working state is negligible relative to the whole time), and the power saving effect is considerable.
  • Tl and t2 can be implemented by timer interrupts (most CPUs have timers inside, which can generate internal interrupts to notify the CPU to process).
  • the operation period of the passive optical network user terminal that can enter the energy-saving state may include the following process: First, the energy-saving state needs to first clear the tl timer and the t2 timer, and then start running the tl timer to allow the passive optical network. User terminal equipment continues to be positive The tl time is always running. After the tl time is run, the tl timer is interrupted, and the t2 timer is started to run.
  • some modules are put into the sleep state by means of the control switch of the module; after the t2 time is finished, t2
  • the timer interrupts and triggers the tl timer to start running.
  • the CPU and related modules are woken up by the t2 timer interrupt to enter the normal working state.
  • the passive optical network user terminal periodically repeats the two processes until the monitoring thread finds that each service module has a service request through the control bus (such as the user's phone off-hook, user FE port Link UP or data traffic, etc.), the passive light
  • the network user terminal suspends the tl timer or the t2 timer, and the passive optical network user terminal enters a normal working state to process the user service, until the self-condition is detected to meet the decision condition of entering the energy-saving state, and the passive optical network user terminal re-enters
  • the power saving state of the low speed connection is maintained, and after the t1 timer or the t2 timer is cleared, the operation continues as shown in FIG.
  • the passive optical network user terminal provided by the present invention is provided with a detection decision module, a communication module and a control module.
  • the detection decision module is mainly used for detecting the state of the user terminal of the passive optical network, and determining whether the detected state meets the decision condition of entering the energy-saving state, and notifying the communication module when determining that the detected state meets the decision condition;
  • the user terminal is in the energy-saving state
  • the user terminal of the passive optical network is continuously detected.
  • the communication module is notified.
  • the process of detecting the state of the passive optical network user terminal by the detection decision module and the decision condition for entering the energy saving state, the energy saving decision condition, and the like are as described in the foregoing method embodiments.
  • the communication module is mainly used for communication between the optical line terminal and the passive optical network terminal.
  • the communication module receives the notification that the decision condition for entering the power saving state is met, the communication module sends a request to enter the power saving state to the optical line terminal.
  • the optical line terminal After receiving the notification that does not meet the energy-saving judgment condition, the optical line terminal sends a request message for exiting the energy-saving state.
  • the request for entering the energy-saving state, the parameter carried in the request message for exiting the energy-saving state, and the like are as described in the foregoing method embodiment.
  • the control module is mainly used to receive the optical line terminal to receive the access in the passive optical network user terminal.
  • the internal module of the passive optical network user terminal is controlled to enter a power-saving state, for example, by using the energy-saving function of the module in the passive optical network user terminal, the corresponding module is controlled to enter the energy-saving state, and the passive optical network is used again.
  • the power switch of the relevant module in the user terminal controls the corresponding module to enter the energy-saving state by controlling the power switch to be turned on and off.
  • the control module controls the passive optical network user terminal not to enter the energy-saving state, and the passive optical network user terminal continues to operate normally.
  • the passive optical network user terminal After the passive optical network user terminal receives the response that the optical line terminal accepts the request to exit the power saving state, or the OLT instructs to exit the energy saving state, the corresponding module is controlled to exit the energy saving state. Specifically, it is as described in the above method embodiment.
  • the future fiber access network will carry data, voice, video, TV and other services, and even carry additional services such as anti-theft monitoring, water and electricity gas meter reading.
  • the user terminal and ONU terminal for fiber access it is likely to require 24 hours of uninterrupted operation.
  • the backup optical network user terminal may be equipped with a backup battery. In this case, the energy-saving design of the passive optical network user terminal is particularly important.
  • the invention designs a power-saving state for the passive optical network user terminal, realizes the purpose of saving energy consumption while keeping the low-speed service uninterrupted, and at the same time reduces the pressure of the thermal design of the O J terminal.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Telephone Function (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Electrically Operated Instructional Devices (AREA)

Description

无源光网络用户终端的运行方法和无源光网络用户终端
技术领域
本发明涉及无源光网络技术领域， 尤其涉及一种无源光网络用户终端 的运行方法和无源光网络用户终端。 发明背景 '
在规模越来越大的宽带接入网络中， 现有的大部分局域网 （LAN) 都 运行在 100Mbit/S 的网络上， 许多大规模的商业公司正在向吉比特以太网 (GE) 过渡。 而在城域核心网和城域边缘网上， 同步光网络 （SONET) I 同步数字体系 （SDH) /吉比特以太网 （GE)带宽容量非常充裕， 这使得接 入网部分产生了严重的带宽瓶颈。 与电缆传输相比较， 光纤传输具有容量 大、 损耗小、 防电磁干扰能力强等优势， 因而， 随着光纤传输成本的逐步 下降，接入网光纤化是必然的发展趋势。代表着"最后一公里"部分的接入网 段， 有超低成本、 简单结构以及便于实现等要求， 这给技术实现带来了很 大的挑战， 而无源光网络 （PON) 采用了无源器件， 是实现宽带光接入网 最有潜力的技术。
从承载的内容来分类， PON技术主要包括 APON (ATM Based PONs, 即基于异步传输模式的无源 网络）、 EPON (Ethernet Based PONs, 即基于 以太网的无源光网络） 以及 GPON (Gigabit PONs, 即吉比特无源光网络） 等。
无源光网络 （PON) 的宽带接入技术存在以下的优势：
无源光网络从中心交换局到用户驻地网之间不存在任何有源器件， 取 而代之的是将无源光器件***到网络中， 并在整个路径上通过分离光波长 的功率来引导传输的流量。 这种替换使得服务提供商不再需要向传输环路 中的有源器件供能和保养， 大大节约了服务提供商的成本。 无源的分光器 和耦合器只起到传递和限制光的作用， 不需要供电和信息处理， 而且具有 不受限制的平均故障间隔时间 （MTBF), 可以全面降低服务供应商的维护 成本。
如图 1 所示， 无源光网络通常是由位于中心局 （CO) 的光线路终端 (OLT) 和一系列位于用户驻地的光网络单元 （ONU) 构成， 在这些器件 中间是由光纤、 无源分光器或耦合器构成的光配线网络 （ODN)， 在一个 PON网络中， 可从服务交换局拉出单根光纤到宽带业务子区或办公园区， 然后再用无源分光器或耦合器从主光纤分离出若干支路到各个大楼或业务 设备上。 该方式可使多个用户共享从交换局到用户驻地这段相对昂贵的光 纤链路， 因而也极大降低了光纤到楼 （FTTB ) 和光纤到户 （FTTH) 的使 用成本。
通过釆用 APON、 BPON (宽带无源光网络）、 EPON或即将标准化的 GPON技术，在 PON的主干光纤上可以支持 155Mbit/s、622Mbit/s、1.25Gbit/s 或 2.5Gbit/s的速率。 为了同时支持语音、 数据和视频应用， 可以静态配置 每个用户的带宽， 也可以动态配置每个用户的带宽。
PON网络数据传输原理如下：
PON技术在上行链路上使用 TDMA ( Time Division Multiple Access即时 分多址）技术， 由局端设备 OLT对网络中的各个 ONU进行时间窗口授权， 即授权不同的 ONU在不同的时间段内发送上行数据， 这样不同 ONU的上行 数据就不会产生冲突。 因此 ONU终端的光模块器件会受 PON协议的控制， 间歇性的打开和关闭光模块的发送功能（即所谓 "突发"发送）。 ONU终端 光模块的接收功能是一直打开的， 便于 ONU从 OLT接收时间段授权信息等。
OLT向 ONU发送时间窗口授权的消息帧中通常包含两个信息， 允许 ONU打开光模块发送的开始时间、 允许 ONU打开光模块发送的持续时间。 OLT根据各 ONU的带宽需求动态分配各 ONU的授权时间窗口， 使得各 O J 的使用带宽可动态变化， 并符合预设的带宽策略， 这个计算和调度的过程 称为 DBA (动态带宽分配）算法， OLT可通过 DBA算法设置某个 ONU得到 授权时间窗口的模式， 譬如定时循环模式等。 在 ONU注册到 PON网络时， OLT和 ONU会进行一次时间同步， 使得双方都认可一个公共时间。
由于 ONU所支持的业务为多业务， 其中有的业务长时间运行在低速连 接状态， 占用带宽很小 （如 VoIP业务下终端和局端的 Keep Alive保持活跃机 制等）。当前的 ONU终端长时间保持在运行状态， 运行过程中所消耗的能量 是固定的， 不具有自动调整功耗的能力， 在长时间运行其实只需要低功耗 的业务时， 造成能源的大量浪费。
能量消耗包括三方面： 局端设备、 终端设备、 中间 ODN网络的衰减消 耗。 局端和终端的消耗很明显， 是器件运行造成的， 中间 ODN网络的消耗 较小， 是因为激光在光纤中衰减造成的。
由于 PON***提出的时间不长， 实际 PON设备也没有投入运营， 目 前还没有涉及 PON终端的相关节能技术。 发明内容
本发明所要解决的技术问题是： 克服现有的无源光网络不能自动调整 耗能的问题， 避免在长时间只运行低功耗业务时， 造成能源大量浪费的现 象。 本发明提供的无源光网络用户终端的运行方法， 使无源光网络用户终 端能够对能量消耗进行自动调整， 以节省能源。
本发明为解决上述技术问题所采用的方法技术方案为：
设置无源光网络用户终端进入节能状态的判决条件；
无源光网络用户终端检测自身状态是否符合进入节能状态的判决条 件， 在符合该判决条件时， 向光线路终端发送进入节能状态的请求；
无源光网络用户终端收到光线路终端接受请求的回应后， 控制内部部 分模块进入节能状态， 并间歇性地在节能状态和正常状态之间转换。
下述方法技术方案为可选技术方案。
所述进入节能状态的判决条件为流量阈值或业务端口的活动指示； 且所述判断符合判决条件的过程包括：
无源光网络用户终端定时检测业务流量， 并根据流量阈值和检测到的 业务流量进行进入节能状态判断； 或者
无源光网络用户终端根据无源光网络业务端口的活动指示进行中断触 发， 并进行进入节能状态的判断。
无源光网络用户终端向光线路终端发送进入节能状态的请求报文， 该 请求报文中包含节能状态参数， 若光线路终端接受请求， 则根据节能状态 参数设定该无源光网络用户终端的动态带宽分配策略， 使分配给无源光网 络用户终端的授权时间窗口在正常状态时段； 若光线路终端不接受请求或 未回应请求， 则无源光网络用户终端不进入节能状态。
所述的节能状态参数包括节能状态运行时间和正常状态运行时间， 无 源光网络用户终端根据运行时间定时苏醒和休眠， 在正常状态下无源光网 络用户终端正常运行， 无源光网络用户终端和光线路终端之间传输低速业 务连接的数据； 在休眠状态下无源光网络用户终端关闭或降低部分模块的 功耗， 不向光线路终端发送数据。
利用无源光网络用户终端内中央处理模块的低功耗模式， 使中央处理 模块进入部分休眠状态。
利用无源光网络用户终端内模块自身的节能功能， 使各模块进入节能 状态； 或者对无源光网络用户终端内的相关模块设置电源开关， 使得无源 光网络用户终端内的中央处理模块通过控制所述电源开关的开启和关闭， 使对应的模块在正常状态和节能状态间切换。
控制光模块和无源光网络协议处理模块处于节能状态， 使无源光网络 用户终端在节能状态时无法传输上下行数据， 以节省光模块和无源光网络 协议处理模块的功耗； 或者控制光模块和部分无源光网络协议处理模块处 于节能状态， 使无源光网络用户终端在节能状态时能够从光线路终端接收 下行数据报文。 所述无源光网络用户终端在节能状态下检测自身状态， 当发现自身状 态不符合节能判决条件时， 从节能状态退出， 恢复正常工作状态。
所述的无源光网络用户终端在节能状态下， 接收光线路终端发送的信 息， 当接收到指示退出节能状态的信息时， 从节能状态退出， 恢复正常工 作状态。
所述无源光网络用户终端在节能状态下准备退出节能状态时， 向光线 路终端发送退出节能状态的请求报文， 要求恢复正常运行时的带宽。
本发明还提供一种无源光网络用户终端设备， 该无源光网络用户终端 设备中设置有检测判决模块、 通信模块和控制模块；
检测判决模块： 用于检测无源光网络用户终端的状态， 并判断检测的 状态是否符合进入节能状态的判决条件， 在确定检测的状态符合该判决条 件时， 通知通信模块；
通信模块： 在接收到通知后， 向光线路终端发送进入节能状态的请求; 控制模块： 在无源光网络用户终端接收到光线路终端接受请求的回应 后， 控制无源光网络用户终端内部部分模块进入节能状态。
本发明的有益效果为： 本发明提供了一种无源光网络用户终端的运行 方法和无源光网络用户终端， 在保持低速连接的情况下节约了能源， 节约 了无源光网络用户终端设备在长时间运行只需要低带宽业务 （如语音） 时 的功耗； 本发明为无源光网络用户终端设备定义了节能状态， 并提供状态 跃迁的条件， 这样， 无源光网络用户终端设备具有根据业务带宽动态调整 功耗的能力， 如在只需要低速连接或单向连接时， 无源光网络用户终端进 入节能状态， 降低了功耗； 当用户业务需要大带宽时， ONU终端进入正常 状态， 功耗恢复正常。
本发明主要考虑了终端设备的节能， 由于终端设备量大面广， 所以会 起到显著的节能作用， 而且在终端设备配备后备电池、 交流电网断电时， 本发明的节能方案可使业务支撑更长时间。 由于无源光网络用户终端因为 埋墙或外接电话等原因需要 24小时开机， 如果不节能， 能源消耗是非常大 的， 设定一个终端以 15-30W的功率 24小时运行， 如果能节能一半， 会取 得相当可观的节能效果。 本发明在保持低速业务不中断的状态下节约了能 耗， 同时减轻了无源光网络用户终端热设计的压力。 附图简要说明
图 1为 PON***结构示意图；
图 2为本发明实施例的无源光网络用户终端逻辑结构图；
图 3为正常状态下的运行时间分布图；
图 4为本发明实施例的节能状态下的运行时间分布图；
图 5为本发明实施例的无源光网络用户终端运行流程示意图。 实施本发明的方式
下面根据附图和实施例对本发明作进一步详细说明：
本发明提供一种 PON***网络用户终端设备的节能方案， 节约无源光 网络用户终端设备在长时间运行只需要低带宽业务 （如语音） 时的功耗， 本发明为无源光网络用户终端设备定义了节能状态， 并提供状态跃迁的条 件。
当无源光网络***中只有少量数据业务请求时， 无源光网络用户终端 (即 ONU) 以保持低速连接的节能方式运行， 本发明提供的方法主要包括 以下步骤：
1、 设置无源光网络用户终端进入节能状态的判决条件。
2、无源光网络用户终端检测自身状态是否符合进入节能状态的判决条 件， 在判断出检测到的状态符合进入节能状态的判决条件时， 向光线路终 端发送进入节能状态的请求。
3、 如果无源光网络用户终端接收到光线路终端接受请求的回应， 则无 源光网络用户终端控制内部部分模块进入节能状态， 并间歇性地在节能状 态和正常状态之间转换。 '
4、 如果无源光网络用户终端没有接收到光线路终端接受请求的回应， 或者接收到光线路终端拒绝其进入节能状态请求的回应， 则无源光网络用 户终端不进入节能状态， 继续正常运行。
在无源光网络用户终端设计时， 无源光网络用户终端内部各模块设计 有控制开关， 通过此开关可以控制各模块的工作状态。 在无源光网络用户 终端设备检测到不需要运行大量业务时， 终端设备将进入节能状态， 即无 源光网络用户终端设备中的各个模块， 除了必要模块如监控数据流的模块 之外， 其它模块则进入定时周期性的苏醒和休眠， 也就是进入节能状态。
进入节能状态的判决条件可以采用流量阈值或业务端口的活动指示， 无源光网络用户终端定时进行进入节能状态判决条件的检测， 或根据无源 光网络用户终端的活动指示进行中断触发， 实时检测自身状态是否符合进 入节能状态的判决条件。 无源光网络用户终端可以利用业务处理部件现有 的流量计数器或业务端口的活动指示进行检测， 例如数据交换芯片有流量 计数和业务数据类型统计， 电话接口模块可检测到用户是否摘机， CATV接 口模块可检测到电视是否开机等。 进入节能状态的判决条件可设置在无源 光网络用户终端 CPU软件中，如在 CPU软件中设置各业务接口状态（如电 话是否摘机等） 或数据端口 （如以太网口） 的流量阈值等。 当检测到的状 态符合预设的判决条件时， 无源光网络用户终端启动进入节能状态的过程。 进入节能状态的判决条件可内置在终端设备软件中， 也可由局端网管下发 至无源光网络用户终端， 还可以由终端设备的用户自行设定， 无源光网络 用户终端中的判决条件可以修改。
无源光网络用户终端可使用定时查询机制或中断触发机制来检测其自 身状态， 定时查询机制通过设定时间定时进行检测； 中断触发机制采用如 电话接口模块检测用户是否摘机、 CATV接口模块检测电视是否开机，产生 中断通知 CPU处理， 实时进行检测。
下面结合附图 2、 以一个具体的无源光网络用户终端为例，对本发明的 技术方案进行说明。
图 2简单描述了一个无源光网络用户终端的模块结构， 图 2中的无源 光网络用户终端包括可完全进入休眠的模块、 不能进入休眠的模块和可以 进入半休眠的模块。 图 2中实线箭头为数据流， 虚线箭头为控制流， 空白 方框是不能休眠的模块， 如电源和时钟模块； 带有完全阴影的方框是可以 休眠的模块， 如光模块、 PON协议处理模块、数据转发模块、业务模块等； 带有一半空白一半阴影的方框是可以进入半休眠的模块， 即在进入休眠时 需要保留一定功能的模块， 如 CPU模块。 这些可进入休眠的模块在具体设 计进入休眠控制时， 可利用相关芯片现有的节能功能 （有些芯片可通过管 脚或寄存器控制其芯片进入低功耗模式）， 或者设计一个电源开关（电源开 关使用可控硅或继电器等）， CPU通过软件控制电源开关， 在电源开关关闭 时， 关闭可休眠模块的电源， 以降低无源光网络用户终端的功耗。
无源光网络用户终端中的 CRJ可以进入部分休眠状态。 大多数通用 CPU (PowerPC, Intel IA32、 ARM. MIPS 等） 都提供低功耗模式， CPU 可以主动进入其设定的 Snap、 Sleep等多种模式， 在这些模式下， CPU仍 可保持部分功能运转， 但 CPU功耗明显降低。 通过内部设定的定时器或外 部终端， CPU可从这些低功耗模式退出， 恢复到正常模式。
CPU通过图 1中的控制总线获取各业务模块的状态信息， 以便作节能 条件判决； CPU还通过控制总线控制各业务模块的低功耗模式， 或直接控 制电源幵关来控制业务模块进入关闭模式。 CPU在节能状态下只保留中断 和监控线程运行， 维持最小的业务状态检测任务。
无源光网络用户终端进入节能状态的过程描述如下：
1、 检测到各业务模块的状态符合进入节能状态的判决条件；
2、 CPU通过 PON接口向局端 OLT发送一个消息报文， 请求进入节能 状态， 并与局端 OLT协商定时连接的参数 （正常运行时间 tl、 部分模块迸 入休眠或关闭的时间 t2等， 如图 4所示）、 自身节能模式（如后面所述节能 模式下的两种可选运行方案） 等。
3、 局端 OLT接收到无源光网络用户终端进入节能状态的请求报文后， 根据定时连接参数和自身节能模式等设置该无源光网络用户终端的 DBA策 略， 使分配给无源光网络用户终端的授权时间窗口在正常状态时段 tl， 局 端 OLT向无源光网络用户终端发送回应报文， 表示接受或拒绝该请求。
4、无源光网络用户终端接收到局端 OLT的接受请求的回应报文后，进 入节能状态， 间歇性的在休眠状态（即节能状态） 和正常状态之间转换。
无源光网络用户终端在正常状态下的运行时间分布图如附图 3所示， 无源光网络用户终端在本发明的节能状态下的运行时间分布图如附图 4所 示； 从图 3、 图 4中可以看出， 无源光网络用户终端在正常状态下的运行没 有休眠， 始终处于全功率运行状态， 在数据业务少时会造成能源浪费； 本 发明的无源光网络用户终端通过间歇性的在休眠状态 （即节能状态） 和正 常状态之间转换， 降低了能源消耗， 节省了能源。
无源光网络用户终端运行流程如附图 5所示。
在图 5 中， 无源光网络用户终端在节能状态下， 一方面持续检测各业 务模块的状态， 一旦发现不符合节能判决条件， 马上从节能状态退出， 恢 复正常工作状态； 另一方面， 无源光网络用户终端在节能状态时间段下接 收局端 OLT发送的各种消息和数据报文，一旦接收到局端 OLT指示退出节 能状态的消息报文， 马上从节能状态退出， 恢复正常工作状态。 无源光网 络用户终端在节能状态下， 从外部网络接收到业务数据报文， 根据协议判 断， 需要其退出节能状态时， 立即从节能状态退出， 恢复正常运行。
无源光网络用户终端在节能状态下准备退出节能状态时， 向局端 OLT 发送退出节能状态的请求报文， 要求恢复正常运行时的带宽； 局端 OLT接 收无源光网络用户终端传输来的请求进入节能状态报文或请求退出节能状 态报文， 并报文进行分析处理， 并向无源光网络用户终端发送回应报文。 无源光网络用户终端在节能状态下， 为了能够通过低速数据连接保证 某些业务的正常运行， 每隔一定时间自动苏醒（通过定时器实现）， 唤醒休 眠的相关模块 （包括光模块和 PON协议处理模块）， 接收局端 OLT传输来 的消息和数据报文， 并进行处理。 对数据报文的处理过程可能是把数据报 文从本地端口发送出去。 然后， 无源光网络用户终端再进入休眠状态； 或 者无源光网络用户终端根据局端 OLT 的要求或其他协议报文的要求 （如 MGCP, SIP等 NGN话音信令）退出节能状态， 恢复正常运行状态。
无源光网络用户终端在节能状态和正常运行状态的区别为： 在节能状 态下， 无源光网络用户终端在图 4的 tl时间段内可传输上行数据、 下行数 据。 无源光网络用户终端在图 4的 t2时间段内的工作状态存在如下两种方 案，无源光网络用户终端可选择性的实现其中一种方案，并上报给局端 OLT 设备：
方案 1、 在 t2时间段内关断光模块和 PON协议处理模块， 即除了电源 和时钟模块外，其它模块都关闭。这样 t2时间段内就无法传输上下行数据， 这种方案的优点是:可节省 t2时间段内光模块和 PON协议处理模块的功耗。
方案 2、 在 t2时间段内不关断光模块、 部分关闭 PON协议处理模块， 电源和时钟模块不关闭， 其它模块都关闭。 这样 t2时间段内可从局端 OLT 处接收下行数据报文。 由于局端 OLT根据无源光网络用户终端的节能请求 设定了 DBA策略， 使得 t2时间段内局端 OLT不向无源光网络用户终端发 送时间窗口授权， 无源光网络用户终端也就无法在 t2时间段内向局端 OLT 发送上行数据报文。
上述方案 2的优点在于： 无源光网络用户终端可随时从 OLT接收下行 报文， 这样， 任何时候来自外部的呼叫 （如 VoIP电话呼叫等）可即时得到 响应。
在上述实施例中，无源光网络用户终端进入节能状态前，会向局端 OLT 发送一个进入节能状态的请求报文。.作为一个具体实例， 进入节能状态的 请求报文中可以包含自身的标识信息、设备版本信息等， 也可以包含 tl、 t2 值， 还可以包含申请低速连接的带宽信息， 如 lOOkps的低速连接带宽等。
局端 OLT可下发要求无源光网络用户终端退出节能状态的报文， 该报 文在无源光网络用户终端下挂电话，.外部网络呼叫该电话时起到了非常显 著的作用。局端 OLT可通过此报文通知无源光网络用户终端退出节能状态， 从而及时唤醒了无源光网络用户终端。 OLT也可以将话音信令报文转发给 无源光网络用户终端， 无源光网络用户终端在处理该报文的过程中， 根据 信令要求， 主动退出节能状态。
图 4中的 U、 t2值由无源光网络用户终端上报给局端 OLT， 局端 OLT 根据此参数设定 DBA策略，使分配给该无源光网络用户终端的授权窗口基 本和 tl时间段重合， 这样即使无源光网络用户终端在 t2时间段内关闭光模 块， 仍可以在授权窗口内发送上行报文给局端 OLT。
在 PON***正常运行后， 无源光网络用户终端设备在用户不需要进行 通信 （如上网、 下载、 点播、 通话等） 时， 只需要很小的带宽和外部保持 低速数据连接（如 VoIP模块和中心交换机的定时握手信息、 透传水电煤气 抄表的串口信息等， 带宽低于 100Kbps), 无源光网络用户终端中部分模块 处于休眠的时间会很长， 则 tl会大大小于 t2。在 tl为 t2的千分之一时， 按 照 EPON标准计算， 无源光网络用户终端可获得最大 1Mbps带宽， 按照 GPON标准计算， 无源光网络用户终端可获得最大 2.5Mbps带宽； 但总能 耗约相当于全部模块处于正常工作状态的功耗的 0.1% (正常工作状态的 tl 时间段相对全部时间来说可忽略不及）， 节省功耗效果相当可观。
tl和 t2可由定时器中断来实现（大部分 CPU内部就有定时器，可定时 产生内部中断通知 CPU处理）。 可进入节能状态的无源光网络用户终端的 运行期可以包括如下过程： 节能状态一开始首先需要把 tl定时器和 t2定时 器都清零， 然后先开始运行 tl定时器， 让无源光网络用户终端设备继续正 常运行 tl时间，运行完 tl时间之后， tl定时器中断， 并触发 t2定时器开始 运行， 与此同时， 通过模块的控制开关等方式使部分模块进入休眠状态； 在运行完 t2时间之后， t2定时器中断， 并触发 tl定时器开始运行， 与此同 时， 通过 t2定时器中断唤醒 CPU以及相关模块， 进入正常工作状态。无源 光网络用户终端周期性重复这两个过程， 直到监控线程通过控制总线发现 各业务模块有业务请求（如用户电话摘机、用户 FE端口 Link UP或有数据 流量等）， 则无源光网络用户终端挂起 tl定时器或者 t2定时器， 无源光网 络用户终端进入正常工作状态， 处理用户业务， 直到再次检测到自身状态 符合进入节能状态的判决条件， 无源光网络用户终端重新进入保持低速连 接的节能状态， tl定时器或 t2定时器被清零后， 继续如附图 5所示的方式 运行。
本发明提供的无源光网络用户终端中设置有检测判决模块、 通信模块 和控制模块。
检测判决模块主要用于检测无源光网络用户终端的状态， 并判断检测 的状态是否符合进入节能状态的判决条件， 在确定检测的状态符合该判决 条件时， 通知通信模块； 当无源光网络用户终端处于节能状态时， 继续对 无源光网络用户终端的自身状态进行检测， 当检测到无源光网络用户终端 的自身状态不符合节能判决条件时， 通知通信模块。 检测判决模块检测无 源光网络用户终端的状态的过程和进入节能状态的判决条件、 节能判决条 件等如上述方法实施例中的描述。
通信模块主要用于光线路终端和无源光网络终端之间的通信。 当通信 模块接收到符合进入节能状态判决条件的通知后， 向光线路终端发送进入 节能状态的请求。 当接收到不符合节能判决条件的通知后， 向光线路终端 发送退出节能状态的请求报文。 进入节能状态的请求、 退出节能状态的请 求报文中承载的参数等如上述方法实施例中的描述。
控制模块主要用于在无源光网络用户终端接收到光线路终端接受进入 节能状态请求的回应后， 控制无源光网络用户终端内部部分模块进入节能 状态， 如利用无源光网络用户终端内模块自身的节能功能， 控制相应模块 进入节能状态， 再如利用无源光网络用户终端内相关模块的电源开关， 通 过控制所述电源开关的开启和关闭， 控制相应模块进入节能状态。 控制模 块在无源光网络用户终端接收到光线路终端拒绝进入节能状态请求的回应 后， 控制无源光网络用户终端不进入节能状态， 无源光网络用户终端继续 正常运行。 在无源光网络用户终端接收到光线路终端接受退出节能状态请 求的回应、 或者 OLT指示退出节能状态的消息报文后， 控制相应模块退出 节能状态。 具体如上述方法实施例中的描述。
未来的光纤接入网将承载数据、 语音、 视频、 TV等多种业务， 甚至可 承载防盗监控、水电煤气抄表等附加业务。作为光纤接入的用户终端、 ONU 终端很可能需要 24小时不间断运行， 考虑到紧急情况下的通信， 可能会为 无源光网络用户终端配备后备电池。 在这种情况下， 无源光网络用户终端 的节能设计就显得尤为重要。
由于 O J用户终端运行的大部分时间 （譬如晚上）， 各业务 （上网、 电话、 电视等） 处于非激活状态， 如果一直保持正常运行， 必然会造成能 源的浪费和发热。 本发明为无源光网络用户终端设计了节能状态， 实现了 保持低速业务不中断的状态下， 节约能耗的目的， 同时减轻了 O J终端热 设计的压力。
本领域技术人员不脱离本发明的实质和精神， 可以有多种变形方案实现 本发明， 以上所述仅为本发明较佳可行的实施例而已， 并非因此局限本发 明的权利范围， 凡运用本发明说明书及附图内容所作的等效变化， 均包含 于本发明的权利范围之内。

Claims

权利要求
1、一种无源光网络用户终端的运行方法，其特征在于，包括以下步骤： 设置无源光网络用户终端进入节能状态的判决条件；
无源光网络用户终端检测自身状态是否符合进入节能状态的判决条 件， 在符合该判决条件时， 向光线路终端发送进入节能状态的请求；
无源光网络用户终端收到光线路终端接受请求的回应后， 控制内部部 分模块进入节能状态， 并间歇性地在节能状态和正常状态之间转换。
2、 根据权利要求 1所述的方法， 其特征在于： 所述进入节能状态的判 决条件为流量阈值或业务端口的活动指示；
且所述判断符合判决条件的过程包括：
无源光网络用户终端定时检测业务流量， 并根据流量阈值和检测到的 业务流量进行进入节能状态判断； 或者
无源光网络用户终端根据无源光网络业务端口的活动指示进行中断触 发， 并进行进入节能状态的判断。
3、 根据权利要求 1所述的方法， 其特征在于： 无源光网络用户终端向 光线路终端发送进入节能状态的请求报文， 该请求报文中包含节能状态参 数， 若光线路终端接受请求， 则根据节能状态参数设定该无源光网络用户 终端的动态带宽分配策略， 使分配给无源光网络用户终端的授权时间窗口 在正常状态时段； 若光线路终端不接受请求或未回应请求， 则无源光网络 用户终端不进入节能状态。
4、 根据权利要求 3所述的方法， 其特征在于： 所述的节能状态参数包 括节能状态运行时间和正常状态运行时间， 无源光网络用户终端根据运行 时间定时苏醒和休眠， 在正常状态下无源光网络用户终端正常运行， 无源 光网络用户终端和光线路终端之间传输低速业务连接的数据； 在休眠状态 下无源光网络用户终端关闭或降低部分模块的功耗， 不向光线路终端发送 数据。
5、 根据权利要求 1所述的方法， 其特征在于： 利用无源光网络用户终 端内中央处理模块的低功耗模式， 使中央处理模块进入部分休眠状态。
6、 根据权利要求 1所述的方法， 其特征在于： 利用无源光网络用户终 端内模块自身的节能功能， 使各模块进入节能状态； 或者对无源光网络用 户终端内的相关模块设置电源开关， 使得无源光网络用户终端内的中央处 理模块通过控制所述电源开关的开启和关闭， 使对应的模块在正常状态和 节能状态间切换。
7、 根据权利要求 6所述的方法， 其特征在于： 控制光模块和无源光网 络协议处理模块处于节能状态， 使无源光网络用户终端在节能状态时无法 传输上下行数据， 以节省光模块和无源光网络协议处理模块的功耗； 或者 控制光模块和部分无源光网络协议处理模块处于节能状态， 使无源光网络 用户终端在节能状态时能够从光线路终端接收下行数据报文。
8、 根据权利要求 1所述的方法， 其特征在于： 所述无源光网络用户终 端在节能状态下检测自身状态， 当发现自身状态不符合节能判决条件时， 从节能状态退出， 恢复正常工作状态。
9、 根据权利要求 1所述的方法， 其特征在于： 所述的无源光网络用户 终端在节能状态下， 接收光线路终端发送的信息， 当接收到指示退出节能 状态的信息时， 从节能状态退出， 恢复正常工作状态。
10、 根据权利要求 1 所述的方法， 其特征在于： 所述无源光网络用户 终端在节能状态下准备退出节能状态时， 向光线路终端发送退出节能状态 的请求报文， 要求恢复正常运行时的带宽。
11、 一种无源光网络用户终端设备， 其特征在于， 无源光网络用户终 端设备中设置有检测判决模块、 通信模块和控制模块；
检测判决模块： 用于检测无源光网络用户终端的状态， 并判断检测的 状态是否符合进入节能状态的判决条件， 在确定检测的状态符合该判决条 件时， 通知通信模块；
通信模块： 在接收到通知后， 向光线路终端发送进入节能状态的请求; 控制模块： 在无源光网络用户终端接收到光线路终端接受请求的回应 后， 控制无源光网络用户终端内部部分模块进入节能状态。
PCT/CN2006/002485 2005-09-23 2006-09-22 Procede pour le fonctionnement d'un terminal utilisateur de reseau optique passif et terminal utilisateur de reseau optique passif WO2007033602A1 (fr)

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US20080212964A1 (en) 2008-09-04
CN1859438A (zh) 2006-11-08
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