WO2009012728A1 - Procédé, appareil et système permettant à une unité de réseau optique d'avoir accès au réseau - Google Patents

Procédé, appareil et système permettant à une unité de réseau optique d'avoir accès au réseau Download PDF

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Publication number
WO2009012728A1
WO2009012728A1 PCT/CN2008/071773 CN2008071773W WO2009012728A1 WO 2009012728 A1 WO2009012728 A1 WO 2009012728A1 CN 2008071773 W CN2008071773 W CN 2008071773W WO 2009012728 A1 WO2009012728 A1 WO 2009012728A1
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WIPO (PCT)
Prior art keywords
unit
information
data channel
channel
network
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PCT/CN2008/071773
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English (en)
French (fr)
Inventor
Huafeng Lin
Guo Wei
Bo Liang
Fei Ye
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Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009012728A1 publication Critical patent/WO2009012728A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0278WDM optical network architectures
    • H04J14/0282WDM tree architectures
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27Arrangements for networking
    • H04B10/272Star-type networks or tree-type networks

Definitions

  • the present invention relates to the field of optical fiber communications, and in particular, to a method for an optical network unit to access a network, an optical network unit, an optical line terminal, and an optical network system. Background technique
  • Passive Optical Network is not included in the Optical Distribution Network (ODN) between the Optical Line Terminal (OLT) and the Optical Network Unit (ONU).
  • ODN Optical Distribution Network
  • ONU Optical Network Unit
  • the specific PON system includes an OLT 101, an ODN 102 and a plurality of ONUs 103 as shown in FIG. PON is more competitive in the next-generation broadband access network due to its simple equipment, flexible equipment networking, convenient equipment installation, point-to-multipoint communication, pure media network, and simple capacity expansion. force.
  • WDM-PON provides one virtual wavelength channel for each ONU uplink, which can provide users with a large working bandwidth, can fully utilize the huge transmission capacity of the optical fiber, and has no ranging, fast synchronization, and large dynamic range of receiving power.
  • WDM-PON has become an important development direction of optical access networks.
  • the WDM-PON system shown in Figure 2 uses an Arrayed Waveguide Grating (AWG) to realize the distribution of optical signals, that is, optical signals with wavelengths ⁇ 1 to ⁇ ⁇ emitted from the OLT are mixed by AWG1 and transmitted.
  • AWG3 outputs different wavelengths of optical signals at different ports according to the wavelength of each optical signal, that is, the optical signal with wavelength ⁇ ⁇ is transmitted to ONU1, and the optical signal with wavelength ⁇ 2 is transmitted to ONU2, .. . . , transmits an optical signal of wavelength ⁇ ⁇ to ONUn.
  • 3 is a time division multiplexed passive optical network (TDM-PON) system based on a power splitter.
  • TDM-PON time division multiplexed passive optical network
  • the optical signal transmitted by the OLT passes through the power splitter, the optical signal is divided into n parts (n depends on The branch ratio of the power splitter is transmitted to each ONU through each branch fiber.
  • n depends on The branch ratio of the power splitter is transmitted to each ONU through each branch fiber.
  • FIG. 4 shows a WDM-PON system based on a power splitter.
  • the system can not change the ODN based on the power splitter, but when the ONU is cold-started, how to assign wavelengths and set ONUs for the ONUs.
  • Tunable Filter (TF) and Tunable Laser (TL) become a problem.
  • one of the methods is to set the Wavelength Assignment Table (WAT) in the OLT and ONU, as shown in Figure 5, under the detailed steps:
  • Step s501 When the ONU is cold-started, the ONU adjusts its TF to detect whether the downlink channel with the wavelength ⁇ dj (j ranges from 1 to n) is used (for example, it can be detected from short wavelength to long wavelength). , or one by one according to the order in WAT ;);
  • Step s502 when the ONU detects an unused downlink channel ⁇ dk (k ranges from 1 to n, and the wavelength will be used later), the ONU TF will lock the channel ⁇ dk;
  • Step s503 the ONU finds the WAT, and obtains the uplink wavelength ⁇ uk corresponding to the downlink channel ⁇ dk; in step s504, the ONU adjusts the TL to the uplink wavelength ⁇ ⁇ ;
  • Step s505 The ONU sends an uplink access request message to the OLT by using the uplink wavelength ⁇ uk, and sets a timer to wait for the downlink response message of the OLT;
  • Step s506 When the ONU receives the response of the OLT from the locked downlink channel in a given time, the setting of the TF and the TL is completed; otherwise, the process returns to the step s501 to perform the detection again.
  • the ONU needs to detect the downlink channels in the WAT set by the OLT one by one, thereby obtaining a usable downlink channel, and the ONU is connected.
  • the average latency into the network grows, reducing system efficiency.
  • the embodiment of the present invention provides a method for an ONU to access an optical network, including:
  • the wavelength negotiation channel is used to negotiate the ONU connection.
  • the data channel of the ONU accessing the network is negotiated on the wavelength negotiation channel according to the data channel set information in the network.
  • an embodiment of the present invention further provides an OLT, including:
  • a data channel maintenance unit configured to detect a data channel in the network to form a data channel set information
  • an information transceiver unit configured to exchange information with the ONU
  • control processing unit configured to configure a wavelength negotiation channel, where the wavelength negotiation channel is used to negotiate a data channel of the ONU access network; and control the information according to the data channel set information provided by the data channel maintenance unit
  • the transceiver unit exchanges information with the optical network unit through the wavelength negotiation channel to negotiate to determine the data channel of the optical network unit to access the network.
  • an embodiment of the present invention further provides an ONU, including:
  • An information transceiver unit configured to exchange information with the OLT
  • control processing unit configured to configure a wavelength negotiation channel for the information transceiver unit, where the wavelength negotiation channel is a data channel for negotiating an ONU access network; and controlling the information transmission and reception according to data channel set information in a network provided by the OLT
  • the unit exchanges information with the optical line terminal through the wavelength negotiation channel to negotiate a data channel of the access network of the ONU.
  • an embodiment of the present invention provides an optical network system, where the optical network system includes an OLT and an ONU, where
  • the OLT includes:
  • a data channel maintenance unit configured to detect a data channel in the network, to form a data channel set information
  • a first information transceiver unit configured to exchange information with the ONU
  • a first control processing unit configured to configure a wavelength negotiation channel for the first information transceiver unit, where the wavelength negotiation channel is a data channel for negotiating an ONU access network; and controlling the first according to the data channel set information
  • the information transceiver unit exchanges information with the ONU through the wavelength negotiation channel to negotiate the negotiation information of the data channel of the ONU access network.
  • the ONU includes:
  • a second information transceiving unit configured to exchange information with the OLT
  • a second control processing unit configured to configure a wavelength negotiation channel for the second information transceiver unit, where the wavelength negotiation channel is a data channel for negotiating an ONU access network; and according to the data channel set information provided by the OLT, the control station
  • the second information transceiver unit passes through the wavelength negotiation channel, and the OLT
  • the interaction information is negotiated to determine the negotiation information of the data channel of the ONU access network.
  • the wavelength negotiation channel is configured between the OLT and the ONU, and according to the data channel set information in the current network provided by the OLT, the currently available data channel is selected to implement the ONU average delay, thereby improving the efficiency of the system. Increased user satisfaction.
  • FIG. 1 is a schematic structural view of a prior art PON system
  • FIG. 2 is a schematic structural diagram of a WDM-PON system of the prior art
  • FIG. 3 is a schematic structural diagram of a prior art power splitter-based TDM-PON system
  • FIG. 4 is a schematic structural diagram of a prior art power splitter-based first WDM-PON system
  • FIG. 6 is a schematic diagram of a structure of a second WDM-PON system of a power splitter
  • FIG. 6 is a main flowchart of a method for an ONU to access a network according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a first embodiment of a method for an ONU to access a network according to the present invention.
  • FIG. 8 is a schematic structural diagram of a power splitter-based WDM-PON system that exchanges information through a full-duplex interactive channel according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a second embodiment of a method for an ONU to access a network according to the present invention.
  • FIG. 10 is a main structural diagram of an OLT according to an embodiment of the present invention.
  • Figure 11 is a schematic view showing a first embodiment of the OLT of the present invention.
  • FIG. 12 is a main structural diagram of an ONU according to an embodiment of the present invention.
  • Figure 13 is a schematic illustration of a first embodiment of an ONU of the present invention. detailed description
  • the embodiment of the invention provides a method for an ONU to access a network, an ONU, an OLT and an optical network system.
  • the data channel of the ONU access network is negotiated on the wavelength negotiation channel configured between the OLT and the ONU according to the data channel set information in the network, thereby reducing the average network access delay of the ONU.
  • FIG. 6 is a main flowchart of a method for an ONU to access a network according to an embodiment of the present invention, where the process is based on FIG. 5 is a structural diagram of a PON system, and referring to the figure, the process mainly includes:
  • Step s601 A wavelength negotiation channel for negotiating a data channel of the ONU access network is configured between the ONU and the OLT.
  • the wavelength negotiation channel uses the wavelength agreed with the ONU in advance to transmit the wavelength negotiation information between the ONU and the OLT.
  • Step s602 negotiateate, according to the data channel set information in the network, the data channel of the ONU access network on the wavelength negotiation channel.
  • the OLT may first detect an unused data channel set in the PON; and then the OLT and the ONU negotiate to select one of the unused data channel sets as the data channel of the ONU access network, Selected by the OLT or selected by the ONU; Finally, the selected data channel is confirmed by the ONU or the OLT. If the confirmation fails, step s602 is re-executed several times, and if the number of executions still fails, the failure information is reported to the upper management unit of the OLT.
  • the negotiated determined data channel can be configured between the ONU and the OLT.
  • the data channel includes upper and lower wavelength parameter information of the channel, and according to the wavelength parameter information, the working wavelength of the transmitter and the receiver of the ONU is locked, and the corresponding receiver and transmitter in the OLT receiver queue and the transmitter queue are selected, so that The transmitter of the OLT and the receiver of the ONU, and the transmitter of the ONU and the receiver of the OLT form a data channel, thereby performing data communication between the OLT and the ONU.
  • FIG. 7 is a schematic diagram of a first embodiment of a method for an ONU to access a network according to the present invention.
  • the method is based on a WDM-PON system based on a power splitter as shown in FIG. 8.
  • a preset step there is a preset step:
  • the wavelengths ⁇ txmgt and ⁇ rxmgt are respectively set as the downstream wavelength and the upstream wavelength of the wavelength negotiation channel.
  • the ⁇ txmgt is 1490 nm and the ⁇ rxmgt is 1310 nm, that is, during the negotiation process.
  • the OLT transmitter Tx-mgt operates at 1490 nm
  • the ONU TF operates at 1490 nm, that is, the ONU receiver operates at 1490 nm
  • the ONU transmitter TL operates at 1310 nm
  • the OLT receiver Rx- The mgt is connected to the 1310 nm wavelength port of the OLT wave decomposition multiplexing device, that is, its operating wavelength is 1310 nm.
  • Step s701 The OLT detects a data channel that is not used by the ONU to access the network in the current network, and forms data channel group information, where the data channel group includes multiple data channels, and the data channel group is a data channel set, and each The data channel contains the upstream and downstream wavelengths.
  • the channel number is used as the upper and lower
  • the combination of the row and wavelength wavelengths, such as channel 1 (channel number 1) corresponds to the combination of the upper and lower wavelengths ( ⁇ )
  • channel information such as channel 1, channel 2 forms the above data channel group information
  • Step s702 The OLT periodically sends the data channel group information to all the unconnected ONUs through the Tx-mgt, and the time slot authorization signal used by the ONU to report the access request.
  • Step s703 the operating wavelength of the TF and the TL is adjusted to the ONU of the negotiation wavelength according to the preset step.
  • the ONU After receiving the data channel group information and obtaining the time slot authorization signal, the ONU first excludes the data channel that failed the previous request, and then the data from the data.
  • a data channel is selected by random or polling in the remaining data channels in the channel group. For example, the data channel group sent by the OLT to the ONU includes the data channel 1, the data channel.
  • Data channel 3 when data channel 1 is used as the data channel of the previous request failure, the channel is excluded, and a data channel is selected as the ONU from the remaining data channel 2 and data channel 3 according to random or polling method. Data channel into the network;
  • Step s704 The ONU sends an access request message carrying the selected data channel information to the OLT in its authorized time slot, where the message includes the channel number of the selected data channel (such as channel number 1), and the ONU Data channel parameters (such as supported data channel rate, whether encryption is supported, supported encryption mode, etc.), ONU's own device identification, etc. At the same time, the ONU sets the timer to wait for the OLT to respond;
  • the channel number of the selected data channel such as channel number 1
  • the ONU Data channel parameters such as supported data channel rate, whether encryption is supported, supported encryption mode, etc.
  • Step s705 After the Rx-mgt receives the access request message of the ONU, the OLT may determine whether to allocate the data channel requested by the ONU according to the device identifier of the ONU in the access request message, the channel parameter of the ONU, and the like. Give the ONU;
  • Step s706 if the OLT decides to allocate the data channel of the request to the ONU, it responds to the ONU with an approval message. In addition, if the OLT decides not to allocate the data channel of the request to the ONU, the OLT returns a rejection report to the ONU. And returning to step s701 to restart the process of the ONU accessing the network; step s707, after receiving the approval message within the predetermined time of the timer, the ONU sets the work of the TF and the TL according to the data channel parameter selected by the ONU. The wavelength and other parameters adjust the TF and TL from the wavelength negotiation channel to the selected data channel, and can start to exchange information with the OLT through the data channel.
  • a timer is set to monitor whether the data sent by the ONU is received on the receiver corresponding to the data channel determined by the selection. If the packet is received within the specified time of the timer, the data channel of the access network of the ONU is indicated. If the allocation succeeds, otherwise the data channel allocation fails, the OLT returns a reject message to the ONU, and returns to step s701 to restart the ONU accessing the network.
  • FIG. 9 is a schematic diagram of a second embodiment of a method for an ONU to access a network according to the present invention.
  • the method is still based on a power splitter-based WDM-PON system according to an embodiment of the present invention as shown in FIG. 8, and before the method, There are a preset step:
  • the wavelengths ⁇ txmgt and ⁇ rxmgt are respectively set as the downstream wavelength and the upstream wavelength of the wavelength negotiation channel.
  • the ⁇ txmgt is 1490 nm and the ⁇ rxmgt is 1310 nm, that is, during the negotiation process.
  • the OLT transmitter Tx-mgt operates at 1490 nm
  • the ONU TF operates at 1490 nm, that is, the ONU receiver operates at 1490 nm
  • the ONU transmitter TL operates at 1310 nm
  • the OLT receiver Rx- The mgt is connected to the 1310 nm wavelength port of the OLT wave decomposition multiplexing device, that is, its operating wavelength is 1310 nm.
  • Step s901 The OLT periodically sends a time slot authorization signal for the ONU to report the access request to all the unconnected ONUs through the Tx-mgt.
  • Step s902 After the time slot authorization signal is obtained, the ONU that adjusts the working wavelength of the TF and the TL to the negotiation wavelength according to the preset step sends an access request message to the OLT in the authorized time slot, where the message includes the data of the ONU.
  • Channel parameters such as supported data channel rate, whether encryption is supported, supported encryption mode, etc.
  • ONU's own device identification etc.
  • the ONU sets the timer to wait for the OLT to respond;
  • Step s903 After receiving the access request message of the ONU by the Rx-mgt, the OLT selects a channel from the data channel group according to the device identifier of the ONU and the data channel parameter requested by the ONU, as the ONU access network.
  • the data channel group is composed of currently available data channels detected by the OLT, and each data channel includes upper and lower wavelengths of the data channel, where the channel number is used as a key, such as data channel 1 (channel)
  • the number is 1) corresponding to the combination of the upper and lower wavelengths is ( ⁇ ⁇ , ⁇ ⁇ +l ), and the combination of the upper and lower wavelengths corresponding to the data channel 2 is ( ⁇ 2, ⁇ ⁇ +2 ), etc., data channel 1, data
  • the information of the data channel that can be used by the channel 2 or the like forms the data channel group; in step s904, the OLT sends a data channel allocation message to the ONU, where the data channel information allocated to the ONU is included;
  • Step s905 After receiving the channel allocation message within the specified time of the timer, the ONU sets the working wavelength of the TF and the TL and other related parameters according to the data channel parameter therein, and sets the TF and the TL.
  • the working wavelength is adjusted from the wavelength negotiation channel to the allocated data channel, and the information is exchanged with the OLT through the data channel. If the ONU does not receive the data channel allocation message from the OLT within the specified time of the timer, the process returns to step s901.
  • a timer is set to monitor whether the data packet sent by the ONU is received on the receiver corresponding to the data channel, if the timer is If the data is received within the specified time, the data channel of the ONU accessing the network is successfully allocated. Otherwise, the data channel allocation failure is indicated.
  • the optical network system includes an OLT and an ONU.
  • the OLT and the ONU are connected through an ODN.
  • the main structure of the OLT and ONU is described as follows:
  • FIG. 10 is a main structural diagram of an OLT according to an embodiment of the present invention.
  • the OLT mainly includes a data channel maintenance unit 101, an information transceiver unit 102, and a control processing unit 103.
  • the connection relationships and functions of the units are as follows:
  • the data channel maintenance unit 101 and the information transceiving unit 102 are respectively connected to the control processing unit 103.
  • the data channel maintenance unit 101 is configured to detect a data channel in the network, and detect an unused data channel available to the ONU to access the network in the current network. Forming data channel group information, the data channel group is a data channel set, that is, forming a data channel set;
  • the information transceiving unit 102 is configured to send and receive information to and from the optical network unit.
  • the information transmitting module includes an information transmitting module and an information receiving module.
  • the information transmitting module may be composed of a plurality of transmitters, and the transmitters may respectively use different working wavelengths, and each transmitting The working wavelength used by the device is fixed; and the information receiving module can be composed of a plurality of receivers connected to different ports of the wave decomposition multiplexer, respectively receiving optical signals of different wavelengths, and the working wavelengths received by each receiver Fixed
  • the control processing unit 103 is configured to control, according to the data channel set information, the transmitter and the receiver corresponding to the wavelength negotiation channel in the information transceiver unit 102 and the ONU interaction information in the negotiating working state, so as to be from the data channel set. Determine the data channel that the ONU accesses the network.
  • control processing unit 103 may be further configured to select a transmitter and a receiver in the information transceiver unit 102 according to the data channel information (eg, working wavelength) determined by negotiation, and form a receiver and a transmitter with the ONU. a communication channel, and controlling the above-mentioned transmitter and receiver in the information transceiving unit to exchange information with the ONU.
  • data channel information eg, working wavelength
  • the structure includes: an information transceiving unit 111, including TL and TF, can dynamically select an operating wavelength, and dynamically select to receive/transmit an optical signal of a certain wavelength;
  • the control processing unit 112 is configured to: according to the locally negotiated channel information negotiated with the OLT in advance, configure the information transceiver unit 111 to negotiate the data channel of the ONU access network with the OLT; and the control information transceiver unit 111 passes the wavelength negotiation channel. Communicate with the OLT, and interact with the OLT to determine the data channel of the access network of the ONU according to the data channel group information in the network provided by the OLT.
  • the above-mentioned control processing unit 112 can also configure the information transceiving unit 111 according to the data channel determined through negotiation. Specifically, before the ONU obtains the data channel authorization from the OLT, the TL and TF of the control information transceiver unit 111 respectively adjust their working wavelengths to the corresponding negotiation wavelengths; after the ONU obtains the authorization of the data channel, the TL and the TF are used. The working wavelength is adjusted to the data channel wavelength of the corresponding ONU access network, and then other parameters are configured to perform data communication with the OLT.
  • optical network system of the embodiment of the present invention will be described below with reference to the accompanying drawings in conjunction with an OLT and an ONU.
  • the optical network system of the present invention may be composed of the first embodiment of the OLT and the first embodiment of the ONU, and the OLT communicates with the ONU through the ODN.
  • FIG. 12 is a schematic diagram of a first embodiment of an OLT according to the present invention.
  • the OLT includes a data channel maintenance unit 121, an information transceiving unit 122, and a control processing unit 123:
  • the data channel maintenance unit 121 is configured to detect a data channel currently available in the network to form a data channel group.
  • Each data channel contains the upper and lower wavelengths, and the channel number is used as the key for the combination of the upper and lower wavelengths.
  • channel 1 (the channel number of the channel is 1) corresponds to the combination of the upper and lower wavelengths ( ⁇ ⁇ , ⁇ ⁇ + l), the combination of the upper and lower wavelengths corresponding to channel 2 is ( ⁇ 2, ⁇ ⁇ +2 ), etc., and the channel information that can be used by channel 1, channel 2, etc. forms the above data channel group.
  • the information transceiver unit 122 is configured to exchange information with the ONU;
  • the control processing unit 123 is configured to configure the information transceiving unit 122 with a wavelength negotiation channel pre-agreed with the ONU; and according to the currently available data channel set information provided by the data channel maintenance unit 121, the control information transceiving unit passes the wavelength negotiation channel, and the ONU The information is exchanged to determine the negotiation information of the data channel of the ONU accessing the network; and the data transceiver unit 122 is configured to negotiate the determined data channel.
  • the information transceiving unit 122 includes a negotiation information transceiving unit 1221 and an access information transceiving unit 1222.
  • the control processing unit 123 includes a negotiation control unit 1231, an access processing unit 1232, and an authorization control unit 1233, where:
  • the negotiation information transceiving unit 1221 includes a pair of transmitters Tx-mgt and receivers Rx-mgt, and parameters such as working wavelengths can be set by the negotiation control unit 1231, and the OLT can exchange information with all ONUs that have not acquired the data channels through the wavelength negotiation channel OLT.
  • the access information transceiver unit 1222 is composed of a transmitter Tx and a receiver Rx by n (n is greater than or equal to the number of ONUs), and the working wavelengths thereof can be fixed;
  • the negotiation control unit 1231 configures parameters such as the working wavelength of the negotiation information transceiving unit 1221 according to the wavelength negotiation channel agreed with the ONU in advance; the control negotiation information transceiving unit 1221 transmits the current available by the data channel maintenance unit 121 to the ONU. After the negotiation information transceiving unit 1221 receives the access request message carrying the data channel information selected by the ONU, the negotiation information transceiving unit 1221 controls the negotiation information transceiving unit 1221 to return the ONU access network to the ONU. Approval message or rejection message for the data channel.
  • the approval packet is used to respond to the access request message of the ONU, and determines whether the ONU is allowed to access according to the data channel selected by the ONU, and includes information such as a data channel allocated to the ONU;
  • the ONU accesses the selected data channel, and includes information such as a data channel allocated to the ONU for verification by the ONU, so that the ONU restarts the access process;
  • the access processing unit 1232 is configured to select, according to the data channel information of the access network of the ONU approved by the negotiation control unit 1231, the transmitter and receiver combination corresponding to the data channel from the access information transceiver unit 1222, and The combination of the transmitter and the receiver is bound to the ONU, so that the information can be exchanged with the ONU through the configured access information transceiver unit 1222;
  • the authorization control unit 1233 is configured to control the negotiation information transceiving unit 1221, and periodically send a time slot authorization signal for the ONU to report the access request to the ONUs that are not accessed by the negotiation of the wavelength negotiation channel configured by the control unit 1231. After obtaining the time slot grant, the access request message can be sent to the OLT within the time slot.
  • the OLT may further include a timing judging unit, and after the negotiation control unit 1231 allocates the data channel of the access network to the ONU, monitor whether the access information transceiving unit 1222 receives the data packet from the ONU on the ONU data channel. If the data packet with the correct format description is received within the time specified by the timing judging unit, it is determined that the data channel allocation of the ONU access network is successful, otherwise the data channel allocation failure is determined.
  • the ONU includes an information transceiving unit 131 and a control processing unit 132.
  • the control processing unit 132 includes a negotiation control unit 1321, an access processing unit 1322, and a contention control unit. 1323, the contact relationship and functions of each unit are as follows:
  • the information transceiver unit 131 is configured to exchange information with the OLT.
  • the control processing unit 132 is configured to configure the information transceiving unit 131 according to the locally negotiated channel information agreed with the OLT in advance; and according to the currently available data channel set information provided by the OLT, the control information transceiving unit 131 passes a wavelength negotiation channel, which exchanges information with the OLT to determine a data channel of the ONU access network; and configures the information transceiver unit 131 to determine the determined data channel;
  • the control processing unit 132 includes a contention control unit 1323, a negotiation control unit 1321, and an access processing unit 1322, where:
  • the competition control unit 1323 after the negotiation control unit 1321 configures the information transceiving unit 131 according to the wavelength negotiation channel information, and before the ONU obtains the data channel authorization from the OLT, receives the time slot authorization information sent by the OLT through the wavelength negotiation channel, and controls the information transmission and reception.
  • the unit 131 sends the response information of the time slot authorization information to the OLT through the wavelength negotiation channel, where the response information indicates that the ONU has the authorization of the OLT to send the access request in the time slot;
  • the negotiation control unit 1321 configures the information transceiving unit 131 to negotiate with the OLT for the data channel of the ONU access network according to the locally negotiated channel negotiation channel information agreed with the OLT. Specifically, the TL and the TF on the information transceiving unit 131 can be respectively adjusted to the upper and lower wavelengths corresponding to the wavelength negotiation channel.
  • the control information transceiving unit 131 receives the time slot authorization signal sent by the OLT and the current available through the wavelength negotiation channel.
  • the data channel group information used is selected from the data channel group as a data channel of the ONU access network. Specifically, after receiving the data channel group information, the negotiation control unit 1321 first excludes the previously recorded request failure data.
  • the control information transceiving unit 131 transmitting in the time slot allowed by the slot grant signal, to the OLT through the wavelength negotiation channel carries the selected Specifically, the access request message includes the selected data channel number, the data channel parameter of the ONU (such as the supported data channel rate, whether the encryption is supported, the supported encryption mode, etc.) Information such as the device identification of the ONU itself; receiving from the OL through the wavelength negotiation channel
  • the approval message of the T after verifying that the approval message is sent to itself, the approved data channel information is handed over to the access processing unit 1322 for processing, wherein the approval message should include the device identifier of the ONU, and the OLT assigns
  • the negotiation control unit 1321 is triggered to perform re-access processing;
  • the access processing unit 1322 after the information transceiving unit 131 receives the approval message of the data channel sent by the OLT to the ONU access network through the negotiation wavelength channel, according to the approval message, The TL and TF of the information transceiving unit 131 are respectively adjusted to the above-mentioned approved data channel and the downlink wavelength, and other related parameters are configured, and then the communication between the OLT and the ONU can be performed;
  • the second embodiment of the optical network system of the present invention can be composed of the second embodiment of the OLT and the second embodiment of the ONU, and the OLT communicates with the ONU through the ODN.
  • the second embodiment of the OLT performs the change of the function of the above-mentioned negotiation control unit 1231 on the basis of the first embodiment of the OLT described above:
  • the relevant parameters such as the working wavelength of the negotiation information transceiving unit 1221 according to the wavelength negotiation channel agreed with the ONU in advance; after the negotiation information transceiving unit 1221 receives the ONU access request message, according to the parameter information and the data channel provided by the ONU
  • the currently available data channel group information provided by the maintenance unit is allocated to the ONU-strip data channel, and the control negotiation information transceiver unit 1221 returns a data channel assignment message or a rejection message to the ONU.
  • the data channel group provides the data channel set information provided by the data channel maintenance unit 121 for the ONU to access the network, and the access request message includes the data channel information selected by the ONU and the data channel parameters expected by the ONU (such as supported data).
  • the channel rate whether the encryption is supported, the supported encryption mode, etc., and the ONU's own device identification information, and the data channel allocation message is used to respond to the ONU access request message, including the data channel allocated to the ONU.
  • Information whether to agree to ONU access and other information. If the OLT does not agree to the ONU access, the negotiation control unit returns a data channel reject message to the ONU, so that the ONU restarts the access process.
  • the second embodiment of the ONU corresponding to the second embodiment of the OLT is as follows.
  • the second embodiment of the ONU performs the function of the second negotiation control unit 1321 on the basis of the first embodiment of the ONU. Change:
  • the information transceiver unit 131 is configured to negotiate with the OLT for the data channel of the ONU access network according to the locally negotiated channel information agreed with the OLT.
  • the TL and the TF on the information transceiver unit can be
  • the control information transceiver unit 131 sends an access request message to the OLT through the wavelength negotiation channel.
  • the access request message includes the data expected by the ONU.
  • Channel parameters such as supported data channel rate, whether encryption is supported, supported encryption mode, etc.), ONU's own device identification, etc.; Receive data channel allocation messages from the OLT, verify that the data channel is assigned to itself.
  • the data channel information is forwarded to the access processing unit 1322 for processing, where the data channel allocation message includes the device identifier of the ONU, the data channel allocated by the OLT to the ONU, and the like; or is received through the wavelength negotiation channel.
  • the negotiation control unit is triggered to reconnect. Into the process.
  • the data channel group information that is currently available to be used by the OLT is negotiated on the wavelength negotiation channel configured between the OLT and the ONU to determine the data channel of the ONU access network, which can reduce the average delay of the ONU accessing the network and improve the efficiency of the system.
  • the above data channel group is formed by a combination of operating wavelengths of any transmitter and receiver currently available on the OLT, and various combinations of ONU data channels can be dynamically provided, thereby improving the selectivity of the ONU data channel.

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Description

光网络单元接入网络的方法、 设备及系统 技术领域
本发明涉及光纤通信领域, 尤其涉及一种光网络单元接入网络的方法、 光 网络单元、 光线路终端及光网络系统。 背景技术
无源光网络( Passive Optical Network, PON )是指在光线路终端( Optical Line Terminal , OLT )与光网络单元( Optical Network Unit, ONU )之间的光分配网络 ( Optical Distribution Network, ODN ) 中没有任何有源电子设备的光接入网络。 具体的 PON系统包括如图 1所示的一个 OLT101、一个 ODN102和多个 ONU103。 由于 PON网络中设备简单、 设备组网灵活、 设备安装方便、 适用于点对多点通 信、 为纯介质网络、 扩容简单, 技术和成本优势使得 PON在下一代宽带接入网 中更具竟争力。 现有的 PON 技术包括有基于异步传输模式 (Asynchronous Transmission Mode, ATM ) 的 APON、 基于以太网 (Ethernet ) 的 EPON、 具有 吉比特速率( Gbit/s )的 GPON、 釆用波分复用 ( Wavelength Division Multiplex, WDM )技术的 WDM-PON,以及釆用光码分多址( Optical Code Division Multiple Access, OCDMA )技术的 OCDMA-PON。 其中, WDM-PON为每个 ONU上行 提供了一路虚拟波长通道, 能够为用户提供较大的工作带宽, 能够充分利用光 纤的巨大传输容量, 而且不存在测距、 快速同步、 接收功率动态范围大等问题, 可以大大简化 OLT、 ONU设备的设计, 降低成本。 因此, WDM - PON成为光 接入网的一个重要发展方向。
图 2所示的 WDM-PON系统釆用阵列波导光栅( Arrayed Waveguide Grating, AWG )来实现光信号的分配, 即 OLT上发出的波长分别为 λ 1到 λ η的光信号 经过 AWG1混合后, 传输到 AWG3 , AWG3根据各个光信号的波长不同, 分别 在不同的端口输出不同波长的光信号, 即将波长为 λ ΐ的光信号传输给 ONU1 , 将波长为 λ 2的光信号传输给 ONU2, ... ... ,将波长为 λ η的光信号传输给 ONUn。 而图 3是基于功率分支器的时分复用无源光网络( Time Division Multiplex-PON, TDM-PON ) 系统, OLT下行发送的光信号通过功率分支器后, 将光信号分成 n 份(n取决于功率分支器的分支比), 并通过各个分支光纤传输给各个 ONU。 随着用户对带宽要求的爆炸式增长, TDM-PON将无法满足用户需求。通过 分析上述两种系统, 可以看出, WDM-PON作为 TDM-PON的继任者, 却无法 直接使用目前 TDM-PON网络的基于功率分支器的 ODN。 因此 WDM - PON需 要考虑 TDM - PON中 ODN网络的后向兼容性。
图 4给出了一种基于功率分支器的 WDM-PON系统, 如图 4所示, 该系统 可以不改动基于功率分支器的 ODN,但是在 ONU冷启动时, 如何为 ONU分配 波长并设置 ONU的可调滤波器 (Tunable Filter, TF )和可调激光器 (Tunable Laser, TL )成为一个问题。 为了解决这个问题, 方法之一是在 OLT与 ONU中 设置波长分配表(Wavelength Assignment Table, WAT ), 如图 5所示, 详细步骤 下:
步骤 s501 , ONU冷启动时, ONU调整其 TF, 逐个检测波长为 λ dj ( j取值 范围为从 1到 n )的下行通道是否已使用 (例如, 可以按从短波长至长波长的顺 序检测, 或根据 WAT中的顺序逐个检测;);
步骤 s502 , 当 ONU检测到一个未使用的下行通道 λ dk ( k取值范围为从 1 到 n, 后面将用波长表示通道 ) 时, ONU的 TF将锁定该通道 λ dk;
步骤 s503 , ONU查找 WAT , 获得与下行通道 λ dk对应的上行波长 λ uk; 步骤 s504, ONU将 TL调整到上行波长 λ ι^上;
步骤 s505, ONU通过上行波长 λ uk向 OLT发送一个上行接入请求报文, 并设置定时器开始等待 OLT的下行响应报文;
步骤 s506, 当 ONU在给定时间内从其锁定的下行通道中接收到 OLT的响 应才艮文, 则完成 TF和 TL的设置; 否则, 将回到步骤 s501 , 重新进行所述检 测。
在实现本发明实施例过程中, 发明人发现现有技术中至少存在如下问题: 按照上述方法, ONU需要对 OLT设置的 WAT中的下行通道进行逐个检测, 从 而得到可使用的下行通道, ONU接入网络的平均时延会增长, 降低系统效率。 发明内容
为了解决上述技术问题,本发明实施例提出了一种 ONU接入光网络的方法, 包括:
在 ONU与 OLT之间配置波长协商通道,该波长协商通道用于协商 ONU接 入网络的数据通道;
根据网络中的数据通道集合信息,在所述波长协商通道上协商确定 ONU接 入网络的数据通道。
相应地, 本发明实施例还提供了一种 OLT, 包括:
数据通道维护单元, 用于检测网络中的数据通道, 形成数据通道集合信息; 信息收发单元, 用于与 ONU交互信息;
控制处理单元, 用于对所述信息收发单元配置波长协商通道, 该波长协商 通道用于协商 ONU接入网络的数据通道;根据所述数据通道维护单元提供的数 据通道集合信息, 控制所述信息收发单元通过所述波长协商通道, 与光网络单 元交互信息以协商确定光网络单元接入网络的数据通道。
相应地, 本发明实施例还提供了一种 ONU, 包括:
信息收发单元, 用于与 OLT交互信息;
控制处理单元, 用于对所述信息收发单元配置波长协商通道, 该波长协商 通道为用于协商 ONU接入网络的数据通道; 根据 OLT提供的网络中的数据通 道集合信息, 控制所述信息收发单元通过所述波长协商通道, 与光线路终端交 互信息以协商确定 ONU的接入网络的数据通道。
另外, 本发明实施例提供了一种光网络系统, 该光网络系统包括有 OLT、 ONU, 其中,
所述 OLT包括:
数据通道维护单元, 用于检测网络中的数据通道, 形成数据通道集合信息; 第一信息收发单元, 用于与 ONU交互信息;
第一控制处理单元, 用于对所述第一信息收发单元配置波长协商通道, 该 波长协商通道为用于协商 ONU接入网络的数据通道;根据所述数据通道集合信 息, 控制所述第一信息收发单元通过所述波长协商通道, 与 ONU之间交互信息 以协商确定 ONU接入网络的数据通道的协商信息,
所述 ONU包括:
第二信息收发单元, 用于与 OLT交互信息;
第二控制处理单元, 用于对所述第二信息收发单元配置波长协商通道, 该 波长协商通道为用于协商 ONU接入网络的数据通道; 根据 OLT提供的所述数 据通道集合信息, 控制所述第二信息收发单元通过所述波长协商通道, 与 OLT 之间交互信息以协商确定 ONU接入网络的数据通道的协商信息。
实施本发明实施例, 具有如下有益效果:
本发明实施例通过在 OLT和 ONU之间配置波长协商通道, 并根据 OLT提 供的当前网络中的数据通道集合信息,选择当前可使用数据通道来实现 ONU接 平均时延, 提高了系统的效率, 增加了用户的满意度。 附图说明
图 1是现有技术的 PON系统的结构示意图;
图 2是现有技术的 WDM-PON系统的结构示意图;
图 3是现有技术的基于功率分支器的 TDM-PON系统的结构示意图; 图 4是现有技术的基于功率分支器的第一 WDM-PON系统的结构示意图; 图 5是现有技术的基于功率分支器的第二 WDM-PON系统的结构示意图; 图 6是本发明实施例的 ONU接入网络的方法的主要流程图;
图 7是本发明的 ONU接入网络的方法的第一实施例示意图;
图 8是本发明实施例的通过全双工交互通道交互信息的基于功率分支器的 WDM-PON系统的结构示意图;
图 9是本发明的 ONU接入网络的方法的第二实施例示意图;
图 10是本发明实施例的 OLT的主要结构图;
图 11是本发明的 OLT的第一实施例示意图;
图 12是本发明实施例的 ONU的主要结构图;
图 13是本发明的 ONU的第一实施例示意图。 具体实施方式
本发明实施例提供了一种 ONU接入网络的方法, 一种 ONU、 OLT及光网 络系统。 可实现根据网络中的数据通道集合信息, 在 OLT与 ONU之间配置的 波长协商通道上协商 ONU接入网络的数据通道, 从而降低了 ONU的网络接入 平均时延。
下面结合附图, 对本发明实施例进行详细说明。
图 6是本发明实施例的 ONU接入网络的方法的主要流程图,该流程基于如 图 5所示的 PON系统的结构图, 参照该图, 该流程主要包括:
步骤 s601 ,在 ONU与 OLT之间配置用于协商 ONU接入网络的数据通道的 波长协商通道。 波长协商通道釆用预先与 ONU约定的波长, 用于传输 ONU与 OLT之间的波长协商信息。
步骤 s602, 根据网络中的数据通道集合信息, 在所述波长协商通道上协商 确定 ONU接入网络的数据通道。 在具体实现时, 可由 OLT首先检测 PON中未 被使用的数据通道集合; 然后由 OLT与 ONU通过协商, 从所述未被使用的数 据通道集合中选择一条作为 ONU接入网络的数据通道,可以由 OLT选择或 ONU 选择; 最后, 由 ONU或 OLT对选择的数据通道进行确认。 如果所述确认失败, 则重新执行步骤 s602若干次, 若执行该若干次仍失败, 则将该失败信息向 OLT 上层管理单元汇报。
在上述步骤 s602之后, 可在 ONU与 OLT之间配置所述协商确定的数据通 道。 上述数据通道包括通道的上、 下行波长参数信息, 根据该波长参数信息, 锁定 ONU的发射器和接收器的工作波长, 选择 OLT接收器队列与发射器队列 中相应的接收器和发射器, 使得 OLT的发射器和 ONU的接收器, 以及 ONU的 发射器和 OLT的接收器之间构成数据通道, 从而进行 OLT与 ONU之间的数据 通信。
而图 7为本发明的 ONU接入网络的方法的第一实施例示意图,该方法基于 如图 8所示的基于功率分支器的 WDM-PON系统, 而在该方法之前, 有一预设 步骤:
在 OLT与 ONU之间预设定以波长 λ txmgt和 λ rxmgt分别为波长协商通道 的下行波长和上行波长, 为描述方便, 殳设 λ txmgt 为 1490nm、 λ rxmgt 为 1310nm, 即在协商过程中, OLT的发射器 Tx-mgt的工作波长为 1490nm, ONU 的 TF的工作波长为 1490nm, 即 ONU的接收器的工作波长为 1490nm; ONU的 发射器 TL的工作波长为 1310nm, OLT的接收器 Rx-mgt连接 OLT的波分解复 用器件的 1310nm波长端口, 即其工作波长为 1310nm。
在上述预设步骤约定的波长协商通道基础上我们有如下步骤:
步骤 s701 , OLT检测当前网络中未使用的可供 ONU接入网络的数据通道, 形成数据通道组信息, 该数据通道组包括多个数据通道, 该数据通道组即为一 个数据通道集合, 每条数据通道包含上、 下行波长。 这里以通道号作为上、 下 行波长组合的关键字, 如通道 1 (通道号为 1 )对应上、 下行波长的组合为 ( λ
1 , λ η+1 ), 通道 2对应的上、 下行波长的组合为 ( λ 2 , λ η+2 )等, 通道 1、 通道 2等通道信息形成上述的数据通道组信息;
步骤 s702, OLT通过 Tx-mgt周期性地向所有未接入的 ONU发送数据通道 组信息, 以及用于 ONU上报接入请求的时隙授权信号;
步骤 s703 ,根据预设步骤已将 TF、 TL的工作波长调整到协商波长的 ONU, 在收到数据通道组信息并获得时隙授权信号后, ONU先排除之前请求失败的数 据通道, 再从数据通道组中剩下的数据通道中通过随机或轮询的方法选取一个 数据通道。 例如, OLT向 ONU发送的数据通道组中包括数据通道 1、 数据通道
2、 数据通道 3 , 则当数据通道 1作为之前请求失败的数据通道时, 排除该通道, 按随机或轮询的方法从剩下的数据通道 2、数据通道 3中选取一个数据通道作为 ONU接入网络的数据通道;
步骤 s704, ONU在其授权时隙内向 OLT发送携带有被选择的数据通道信息 的接入请求报文, 该报文包括有所选取的数据通道的通道号 (如通道号 1 ), 以 及 ONU的数据通道参数(如支持的数据通道速率、 是否支持加密、 支持的加密 方式等)、 ONU自身的设备标识等, 与此同时, ONU设置定时器进入等待 OLT 响应的状态;
步骤 s705 , OLT在 Rx-mgt接收到 ONU的接入请求报文后, 可以根据接入 请求报文中的 ONU的设备标识、 ONU的通道参数等信息来决定是否将 ONU所 请求的数据通道分配给该 ONU;
步骤 s706,如果 OLT决定为该 ONU分配其请求的数据通道, 则向 ONU回 应批准报文, 另夕卜,如果 OLT决定不为该 ONU分配其请求的数据通道,则 OLT 向该 ONU返回拒绝报文, 并返回步骤 s701 , 重新开始 ONU接入网络的过程; 步骤 s707 , ONU在上述定时器规定时间内接收到所述批准报文后, 根据其 选择的数据通道参数, 设置 TF、 TL的工作波长及其它参数, 将 TF、 TL从波长 协商通道调整到所述选择的数据通道上, 并可开始通过数据通道与 OLT交互信 息,若 ONU在定时器规定时间内未收到来自 OLT的批准报文,则返回步骤 s701 所处的状态; 在 OLT, 当 OLT发送了批准报文之后, 将设置一定时器, 监控在 上述选择确定的数据通道对应的接收器上是否收到了该 ONU发送的数据包,若 在定时器规定时间内接收到该数据包,则指示该 ONU的接入网络的数据通道分 配成功, 否则指示该数据通道分配失败, OLT向该 ONU返回拒绝报文, 并返回 步骤 s701 , 重新开始 ONU接入网络的过程。
图 9为本发明的 ONU接入网络的方法的第二实施例示意图,该方法仍基于 如图 8所示的本发明实施例的基于功率分支器的 WDM-PON系统, 而在该方法 之前, 有一预设步骤:
在 OLT与 ONU之间预设定以波长 λ txmgt和 λ rxmgt分别为波长协商通道 的下行波长和上行波长, 为描述方便, 殳设 λ txmgt 为 1490nm、 λ rxmgt 为 1310nm, 即在协商过程中, OLT的发射器 Tx-mgt的工作波长为 1490nm, ONU 的 TF的工作波长为 1490nm, 即 ONU的接收器的工作波长为 1490nm; ONU的 发射器 TL的工作波长为 1310nm, OLT的接收器 Rx-mgt连接 OLT的波分解复 用器件的 1310nm波长端口, 即其的工作波长为 1310nm。
在上述预设步骤约定的波长协商通道基础上我们有如下步骤:
步骤 s901 , OLT通过 Tx-mgt周期性地向所有未接入的 ONU发送用于 ONU 上报接入请求的时隙授权信号;
步骤 s902, 根据预设步骤已将 TF、 TL工作波长调整到协商波长的 ONU在 获得时隙授权信号后, 在该授权时隙内向 OLT发送接入请求报文, 该报文包括 有 ONU的数据通道参数(如支持的数据通道速率、 是否支持加密、 支持的加密 方式等)、 ONU自身的设备标识等, 与此同时, ONU设置定时器进入等待 OLT 响应的状态;
步骤 s903 , OLT在 Rx-mgt接收到 ONU的接入请求报文后, OLT将根据 ONU的设备标识、 ONU请求的数据通道参数等信息,从数据通道组中选取一个 通道, 作为 ONU接入网络的数据通道; 其中, 数据通道组由 OLT检测到的当 前可使用的数据通道组成, 每条数据通道包含该数据通道的上、 下行波长, 这 里以通道号为关键字, 如数据通道 1 (通道号为 1 )对应上、 下行波长的组合为 ( λ ΐ , λ η+l ), 数据通道 2对应的上、 下行波长的组合为 ( λ 2, λ η+2 )等, 数据通道 1、 数据通道 2等可使用的数据通道的信息形成上述数据通道组; 步骤 s904, OLT向 ONU发送数据通道分配报文, 其中包括分配给该 ONU 的数据通道信息;
步骤 s905, ONU在上述定时器规定时间内接收到所述通道分配报文后, 根 据其中的数据通道参数, 设置 TF、 TL的工作波长及其它相关参数, 将 TF、 TL 的工作波长从波长协商通道调整到分配的数据通道上, 并开始通过该数据通道 与 OLT交互信息, 若 ONU在定时器规定时间内未收到来自 OLT的数据通道分 配报文, 则返回步骤 s901所处的状态; 在 OLT, 当 OLT发送了数据通道分配报 文之后,将设置一定时器,监控在该数据通道对应的接收器上是否收到了该 ONU 发送的数据包, 若在该定时器规定时间内接收到, 则指示该 ONU接入网络的数 据通道分配成功, 否则指示该数据通道分配失败。
光网络系统包括有 OLT、 ONU, OLT与 ONU通过 ODN相连, 该 OLT、 ONU的主要结构叙述如下:
图 10是本发明实施例的 OLT的主要结构图, 该 OLT主要包括数据通道维 护单元 101、 信息收发单元 102、 控制处理单元 103 , 各单元连接关系及功能如 下述:
数据通道维护单元 101、 信息收发单元 102分别与控制处理单元 103相连; 数据通道维护单元 101 , 用于检测网络中的数据通道, 当检测当前网络中未 使用的可供 ONU接入网络的数据通道, 形成数据通道组信息, 该数据通道组即 为一个数据通道集合, 即形成数据通道集合;
信息收发单元 102, 用于与光网络单元之间收发信息; 包括信息发射模块和 信息接收模块, 信息发射模块可由若干个发射器组成, 这些发射器可分别使用 不同的工作波长, 而每一发射器使用的工作波长固定; 而信息接收模块可由若 干个接收器组成, 这些接收器连接到波分解复用器的不同端口, 可分别接收不 同波长的光信号, 而每一接收器接收的工作波长固定;
控制处理单元 103 , 用于根据所述数据通道集合信息, 控制信息收发单元 102中与波长协商通道对应的发射器和接收器与处于协商工作状态的 ONU交互 信息, 从而从所述数据通道集合中确定出 ONU接入网络的数据通道。
上述控制处理单元 103 在执行上述流程后, 还可用于根据协商确定的数据 通道信息 (如: 工作波长)选择信息收发单元 102 中的发射器和接收器, 与该 ONU的接收器和发射器构成通信通道, 并控制信息收发单元中的上述发射器和 接收器与 ONU交互信息。
图 11是本发明实施例的 ONU的主要结构图, 参照该图, 该结构包括: 信息收发单元 111 , 包括 TL、 TF, 可以动态选择工作波长, 动态选择接收 / 发送某一波长的光信号; 控制处理单元 112, 用于根据存储在本地的、 预先与 OLT约定的波长协商 通道信息,配置信息收发单元 111 ,进而与 OLT协商 ONU接入网络的数据通道; 控制信息收发单元 111通过波长协商通道与 OLT通信,根据 OLT提供的网络中 的数据通道组信息, 与 OLT交互确定 ONU的接入网络的数据通道。
上述控制处理单元 112在执行上述流程后, 还可根据协商确定的数据通道 对信息收发单元 111进行配置。 具体地, 在 ONU没有从 OLT获得数据通道授 权之前, 控制信息收发单元 111的 TL、 TF, 分别将其工作波长调到对应的协商 波长上; 在 ONU获得数据通道的授权之后, 将 TL、 TF的工作波长调到对应的 ONU接入网络的数据通道波长, 之后配置其他参数以与 OLT进行数据通信。
下面参照附图,结合 OLT、 ONU来对本发明实施例的光网络系统进行说明。 对于本发明的光网络系统的第一实施例, 可由下述 OLT 的第一实施例和 ONU的第一实施例组成 , OLT与 ONU之间通过 ODN通信。
图 12是本发明的 OLT的第一实施例示意图, 该 OLT包括有数据通道维护 单元 121、 信息收发单元 122、 控制处理单元 123:
数据通道维护单元 121 , 用于检测网络中当前可使用的数据通道, 形成数据 通道组。 每条数据通道包含上、 下行波长, 以通道号作为上、 下行波长组合的 关键字, 如通道 1 (该通道的通道号为 1 )对应上、 下行波长的组合为 ( λ ΐ , λ η+l ), 通道 2对应的上、 下行波长的组合为 ( λ 2, λ η+2 )等, 通道 1、 通道 2等可使用的通道信息形成上述数据通道组。
信息收发单元 122, 用于与 ONU交互信息;
控制处理单元 123 , 用于对信息收发单元 122配置与 ONU预先约定的波长 协商通道; 根据数据通道维护单元 121提供的当前可使用的数据通道集合信息, 控制信息收发单元通过波长协商通道, 与 ONU交互信息以确定 ONU接入网络 的数据通道的协商信息; 并对信息收发单元 122配置协商确定的数据通道。
所述信息收发单元 122, 包括协商信息收发单元 1221 , 接入信息收发单元 1222; 所述控制处理单元 123 , 包括协商控制单元 1231 , 接入处理单元 1232, 和授权控制单元 1233 , 其中:
协商信息收发单元 1221 , 包括一对发射器 Tx-mgt和接收器 Rx-mgt, 其工 作波长等参数可由协商控制单元 1231来设置,通过波长协商通道 OLT可与所有 未获取数据通道的 ONU交互信息; 接入信息收发单元 1222, 由 n ( n大于或等于 ONU的个数)对发射器 Tx 和接收器 Rx组成, 其工作波长均可固定不变;
协商控制单元 1231 ,根据预先与 ONU约定的波长协商通道,对所述协商信 息收发单元 1221 的工作波长等参数进行配置; 控制协商信息收发单元 1221 向 ONU发送由数据通道维护单元 121提供的当前可使用的数据通道组信息, 在协 商信息收发单元 1221接收到携带有 ONU选择的数据通道信息的接入请求报文 后,控制所述协商信息收发单元 1221向 ONU返回对所述 ONU接入网络的数据 通道的批准报文或拒绝报文。 其中, 批准报文用于对 ONU的接入请求报文进行 响应, 确定是否同意该 ONU按照 ONU选择的数据通道进行接入, 并包含分配 给 ONU的数据通道等信息;拒绝报文用于拒绝 ONU以该选择的数据通道接入, 并包含分配给 ONU的数据通道等信息, 以供 ONU进行核实, 从而使得 ONU 重新开始接入过程;
接入处理单元 1232, 用于根据协商控制单元 1231批准的 ONU的接入网络 的数据通道信息, 从接入信息收发单元 1222中选择与该数据通道对应的发射器 和接收器组合, 并将该发射器和接收器组合与该 ONU进行绑定, 使得可通过配 置好的接入信息收发单元 1222与 ONU交互信息;
授权控制单元 1233 , 用于控制协商信息收发单元 1221 , 通过协商控制单元 1231配置的波长协商通道, 向所有未接入的 ONU周期性地发送用于 ONU上报 接入请求的时隙授权信号, ONU在获得时隙授权后, 可在该时隙内向 OLT发送 接入请求艮文。
该 OLT还可以包括一个定时判断单元, 可在协商控制单元 1231为 ONU分 配了接入网络的数据通道之后, 监控接入信息收发单元 1222是否在所述 ONU 数据通道上接收到来自 ONU的数据包,若在定时判断单元规定时间内接收到格 式描述正确的数据包, 则判断 ONU接入网络的数据通道分配成功, 否则判断该 数据通道分配失败。
与上述 OLT的第一实施例对应的有如下述的 ONU的第一实施例。
图 13为本发明的 ONU的第一实施例示意图,该 ONU包括有信息收发单元 131、 控制处理单元 132, 其中控制处理单元 132包括有协商控制单元 1321、 接 入处理单元 1322、 竟争控制单元 1323 , 各单元联系关系及功能如下述:
信息收发单元 131 , 用于与 OLT交互信息; 控制处理单元 132, 用于根据存储在本地的、 预先与 OLT约定的波长协商 通道信息, 对信息收发单元 131进行配置; 根据 OLT提供的当前可使用的数据 通道集合信息, 控制信息收发单元 131通过波长协商通道, 与 OLT交互信息, 以确定 ONU的接入网络的数据通道; 并对信息收发单元 131配置协商确定的数 据通道;
所述控制处理单元 132, 包括竟争控制单元 1323 , 协商控制单元 1321 , 和 接入处理单元 1322, 其中:
竟争控制单元 1323 ,在协商控制单元 1321根据波长协商通道信息配置好信 息收发单元 131之后, 且 ONU从 OLT获得数据通道授权之前, 通过波长协商 通道接收 OLT发送的时隙授权信息, 控制信息收发单元 131通过波长协商通道 向 OLT发送时隙授权信息的应答信息, 该应答信息指示该 ONU具有 OLT在该 时隙内发送接入请求才艮文的授权;
协商控制单元 1321 , 根据存储在本地的、 预先与 OLT约定的波长协商通道 信息, 对信息收发单元 131进行配置, 用于与 OLT协商 ONU接入网络的数据 通道。 具体地, 可将信息收发单元 131上的 TL、 TF分别调整到该波长协商通道 对应的上、 下行波长上; 控制信息收发单元 131通过波长协商通道, 接收 OLT 发送的时隙授权信号和当前可使用的数据通道组信息, 从该数据通道组中选择 一个作为 ONU接入网络的数据通道, 具体地, 可在接收到数据通道组信息后, 协商控制单元 1321先排除之前记录的请求失败的数据通道, 从剩下未使用的数 据通道中随机 /轮询选取一个数据通道; 控制信息收发单元 131 , 在时隙授权信 号允许的时隙内, 通过波长协商通道向 OLT发送携带有所述被选择的数据通道 信息的接入请求报文, 具体地, 该接入请求报文包括选取的数据通道号、 ONU 的数据通道参数(如支持的数据通道速率、是否支持加密、 支持的加密方式等)、 ONU自身的设备标识等信息; 通过波长协商通道接收来自 OLT的批准报文, 在 核实是发给自己的批准报文后, 将被批准的数据通道信息交给接入处理单元 1322进行处理 , 其中该批准报文应包括 ONU的设备标识、 OLT分配给该 ONU 的数据通道等信息; 或通过波长协商通道接收到 OLT对选择的数据通道的拒绝 报文后, 触发协商控制单元 1321进行重新接入处理;
接入处理单元 1322, 在信息收发单元 131通过协商波长通道, 接收到上述 OLT发送的对 ONU接入网络的数据通道的批准报文之后,根据该批准报文, 将 信息收发单元 131的 TL、 TF分别调整到上述批准的数据通道上、 下行波长上, 并进行其他相关参数的配置, 之后则可进行 OLT与 ONU之间的通信;
对于本发明的光网络系统的第二实施例, 可由下述 OLT 的第二实施例和 ONU的第二实施例组成 , OLT与 ONU之间通过 ODN通信。
该 OLT第二实施例在上述 OLT的第一实施例基础上进行了上述协商控制单 元 1231功能的改变:
根据预先与 ONU约定的波长协商通道, 对协商信息收发单元 1221的工作 波长等相关参数进行配置; 在协商信息收发单元 1221接收到 ONU接入请求报 文后,根据 ONU提供的参数信息和数据通道维护单元提供的当前可使用的数据 通道组信息, 分配给 ONU—条数据通道, 控制协商信息收发单元 1221向 ONU 返回数据通道分配报文或拒绝报文。 上述数据通道组为数据通道维护单元 121 提供的可供 ONU接入网络的数据通道集合信息, 而接入请求报文包括有 ONU 选取的数据通道信息、 ONU期望的数据通道参数(如支持的数据通道速率、 是 否支持加密、 支持的加密方式等)、 ONU自身的设备标识等信息, 而数据通道分 配报文则用于对 ONU的接入请求报文进行响应, 包含分配给 ONU的数据通道 等信息, 是否同意 ONU接入等信息。 若 OLT不同意该 ONU接入, 则协商控制 单元则向 ONU返回数据通道拒绝报文, 从而使得 ONU重新开始接入过程。
相应的, 与上述 OLT的第二实施例对应的有如下述的 ONU的第二实施例, 该 ONU第二实施例在上述 ONU的第一实施例基础上进行了上述第二协商控制 单元 1321功能的改变:
根据存储在本地的、 预先与 OLT约定的波长协商通道信息, 配置所述信息 收发单元 131 , 用于与 OLT协商 ONU接入网络的数据通道, 具体地, 可将信息 收发单元上的 TL、 TF分别调整到该波长协商通道对应的上、 下行波长上; 控制 信息收发单元 131通过所述波长协商通道, 向 OLT发送接入请求报文,具体地, 该接入请求报文包括 ONU期望的数据通道参数 (如支持的数据通道速率、 是否 支持加密、 支持的加密方式等)、 ONU自身的设备标识等; 接收来自 OLT的数 据通道分配报文, 在核实是发给自己的数据通道分配报文后, 将其中的数据通 道信息交给接入处理单元 1322进行处理, 其中该数据通道分配报文包括 ONU 的设备标识、 OLT分配给该 ONU的数据通道等相关信息; 或在通过波长协商通 道接收到 OLT对选择的数据通道的拒绝报文后, 触发协商控制单元进行重新接 入处理。
通过 OLT提供的当前可使用的数据通道组信息, 在 OLT与 ONU之间配置 的波长协商通道上协商确定 ONU接入网络的数据通道, 可降低 ONU接入网络 的平均时延, 提高系统的效率; 釆用 OLT上当前可使用的任意发射器和接收器 的工作波长的组合形成上述数据通道组,可动态提供 ONU数据通道的多种组合, 从而提高 ONU数据通道的可选性。
以上所述是本发明的优选实施方式, 应当指出, 对于本技术领域的普通技 术人员来说, 在不脱离本发明原理的前提下, 还可以做出若干改进和润饰, 这 些改进和润饰也视为本发明的保护范围。

Claims

权 利 要 求
1、 一种光网络单元接入网络的方法, 其特征在于, 包括:
在光网络单元与光线路终端之间配置波长协商通道, 该波长协商通道用于 协商所述光网络单元接入网络的数据通道;
根据网络中的数据通道集合信息, 在所述波长协商通道上协商确定所述光 网络单元接入网络的数据通道。
2、 如权利要求 1所述的光网络单元接入网络的方法, 其特征在于, 所述根 据网络中的数据通道集合信息, 在所述波长协商通道上协商确定所述光网络单 元接入网络的数据通道包括: 元接入网络的数据通道;
向所述光线路终端发送携带有所述选择的数据通道信息的接入请求; 数据通道的批准报文。
3、 如权利要求 1所述的光网络单元接入网络的方法, 其特征在于, 所述根 据网络中的数据通道集合信息, 在所述波长协商通道上协商确定所述光网络单 元接入网络的数据通道包括:
所述光线路终端根据所述光网络单元的接入请求, 从该光线路终端所提供 的所述数据通道集合中为所述光网络单元分配所述光网络单元接入网络的数据 通道;
向所述光网络单元返回携带有所述分配的数据通道信息的分配报文。
4、 如权利要求 2或 3所述的光网络单元接入网络的方法, 其特征在于, 该 方法还包括: 才艮接入请求的时隙授权。
5、 如权利要求 2或 3所述的光网络单元接入网络的方法, 其特征在于, 所 述数据通道集合为网络中当前可使用的上、 下行波长通道的任意组合。
6、 一种光线路终端, 其特征在于, 包括:
数据通道维护单元, 用于检测网络中的数据通道, 形成数据通道集合信息; 信息收发单元, 用于与光网络单元交互信息;
控制处理单元, 用于对所述信息收发单元配置波长协商通道, 该波长协商 通道用于协商所述光网络单元接入网络的数据通道; 根据所述数据通道维护单 元提供的数据通道集合信息, 控制所述信息收发单元通过所述波长协商通道, 与所述光网络单元交互信息, 以协商确定所述光网络单元接入网络的数据通道。
7、如权利要求 6所述的光线路终端, 其特征在于, 所述控制处理单元包括: 的信息, 对所述信息收发单元进行配置; 控制所述信息收发单元通过所述波长 协商通道向所述光网络单元发送所述数据通道集合信息; 并在所述信息收发单 元通过所述波长协商通道, 接收到携带有所述光网络单元选择的数据通道信息 的接入请求报文后, 控制所述信息收发单元向所述光网络单元返回对所述选择 的数据通道的批准报文;
接入处理单元, 用于对所述信息收发单元配置所述选择的数据通道。
8、如权利要求 6所述的光线路终端, 其特征在于, 所述控制处理单元包括: 息, 对所述信息收发单元进行配置; 在所述信息收发单元通过所述波长协商通 道接收到所述光网络单元接入请求报文后, 从所述数据通道集合信息中为光网 络单元分配数据通道, 控制所述信息收发单元向所述光网络单元返回携带所述 分配的数据通道的分配报文;
接入处理单元, 用于对所述信息收发单元配置所述分配的数据通道。
9、 如权利要求 7或 8所述的光线路终端, 其特征在于, 所述控制处理单元 还包括: 授权控制单元, 用于控制所述信息收发单元通过所述波长协商通道向光网 络单元周期性地发送用于光网络单元上报接入请求的时隙授权信息。
10、 如权利要求 9 所述的光线路终端, 其特征在于, 所述信息收发单元包 括:
协商信息收发单元, 用于在所述协商控制单元和所述授权控制单元的控制 息; … ' ' H ' * ' 接入信息收发单元, 用于在所述接入处理单元的控制下, 通过所述协商后 的数据通道与光网络单元交互信息。
11、 一种光网络单元, 其特征在于, 包括:
信息收发单元, 用于与光线路终端交互信息;
控制处理单元, 用于对所述信息收发单元配置波长协商通道, 该波长协商 通道用于协商光网络单元接入网络的数据通道; 根据所述光线路终端提供的网 络中的数据通道集合信息, 控制所述信息收发单元通过所述波长协商通道, 与 光线路终端交互信息, 以协商确定光网络单元的接入网络的数据通道。
12、 如权利要求 11所述的光网络单元, 其特征在于, 所述控制处理单元包 括: 息, 对所述信息收发单元进行配置; 控制所述信息收发单元通过所述波长协商 通道, 接收来自所述数据通道集合信息后, 从该数据通道集合中选择光网络单 元接入网络的数据通道; 控制所述信息收发单元通过所述波长协商通道, 向光 线路终端发送携带有所述选择的数据通道信息的接入请求;
接入处理单元, 用于在所述信息收发单元通过所述协商波长通道, 接收到 来自光线路终端的所述数据通道的批准报文后, 根据该批准的数据通道, 对所 述信息收发单元进行配置。
13、 如权利要求 11所述的光网络单元, 其特征在于, 所述控制处理单元包 括: 息, 对所述信息收发单元进行配置; 控制所述信息收发单元通过所述波长协商 通道, 向光线路终端发送接入请求;
接入处理单元, 用于在所述信息收发单元通过所述协商波长通道, 接收到 来自于所述光线路终端的所述数据通道的分配报文后, 根据该分配的数据通道 的信息, 对所述信息收发单元进行配置。
14、 如权利要求 12或 13所述的光网络单元, 其特征在于, 所述控制处理 单元还包括:
竟争控制单元, 用于在所述信息收发单元通过所述波长协商通道, 接收到 用于上报接入请求的时隙授权信息后, 控制所述信息收发单元通过所述波长协 商通道发送时隙授权信息的应答信息。
15、 一种光网络系统, 该光网络系统包括有光线路终端及光网络单元, 其 特征在于,
所述光线路终端包括:
数据通道维护单元, 用于检测网络中的数据通道, 形成数据通道集合信息; 第一信息收发单元, 用于与所述光网络单元交互信息;
第一控制处理单元, 用于对所述第一信息收发单元配置波长协商通道, 该 波长协商通道为用于协商所述光网络单元接入网络的数据通道; 根据所述数据 通道集合信息, 控制所述第一信息收发单元通过所述波长协商通道, 与所述光 网络单元交互信息, 以协商确定所述光网络单元接入网络的数据通道,
所述光网络单元包括:
第二信息收发单元, 用于与所述光线路终端交互信息;
第二控制处理单元, 用于对所述第二信息收发单元配置用于协商所述光网 络单元接入网络的数据通道的波长协商通道; 根据所述光线路终端提供的所述 数据通道集合信息, 控制所述第二信息收发单元通过所述波长协商通道, 与所 述光线路终端交互信息以协商确定所述光网络单元接入网络的数据通道。
PCT/CN2008/071773 2007-07-26 2008-07-28 Procédé, appareil et système permettant à une unité de réseau optique d'avoir accès au réseau WO2009012728A1 (fr)

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