WO2013173983A1 - 多波长无源光网络的波长切换方法、***和装置 - Google Patents
多波长无源光网络的波长切换方法、***和装置 Download PDFInfo
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- WO2013173983A1 WO2013173983A1 PCT/CN2012/075921 CN2012075921W WO2013173983A1 WO 2013173983 A1 WO2013173983 A1 WO 2013173983A1 CN 2012075921 W CN2012075921 W CN 2012075921W WO 2013173983 A1 WO2013173983 A1 WO 2013173983A1
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- 238000000034 method Methods 0.000 title claims abstract description 110
- 230000005540 biological transmission Effects 0.000 claims description 93
- 230000004044 response Effects 0.000 claims description 37
- 238000011144 upstream manufacturing Methods 0.000 claims description 36
- 238000012545 processing Methods 0.000 claims description 17
- 238000013475 authorization Methods 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 9
- 239000013307 optical fiber Substances 0.000 description 9
- 230000010076 replication Effects 0.000 description 9
- 238000013507 mapping Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
- H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
- H04J14/0247—Sharing one wavelength for at least a group of ONUs
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
- H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
- H04J14/0252—Sharing one wavelength for at least a group of ONUs, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0256—Optical medium access at the optical channel layer
- H04J14/0257—Wavelength assignment algorithms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0256—Optical medium access at the optical channel layer
- H04J14/0258—Wavelength identification or labelling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0267—Optical signaling or routing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0282—WDM tree architectures
Definitions
- the present application mainly relates to optical communication technologies, and in particular, to a multi-wavelength passive optical network
- the traditional PON system is a point-to-multipoint network system based on Time Division Multiplexing (TDM) mechanism.
- TDM Time Division Multiplexing
- the PON system usually includes an Optical Line Terminal (OLT) located at the office side.
- OLT Optical Line Terminal
- ODN optical distribution network
- the ODN is used to distribute or multiplex data signals between the OLT and the ONU, so that the multiple ONUs can share an optical transmission channel.
- the direction from the OLT to the ONU is called downlink.
- the OLT broadcasts the downlink data stream to all ONUs according to the TDM mode.
- Each ONU only receives data with its own identity; from the ONU to the OLT.
- the PON system uses the Time Division Multiple Access (TDMA) mode in the uplink direction, that is, the OLT for each of the ONUs to share the optical transmission channel.
- TDMA Time Division Multiple Access
- the PON system uses the Time Division Multiple Access (TDMA) method in the uplink direction.
- the ONU allocates time slots, and each ONU sends uplink data strictly according to the time slot allocated by the OLT.
- the industry proposes a hybrid PON system combining Wavelength Division Multiplexing (WDM) technology and TDM technology.
- WDM Wavelength Division Multiplexing
- the hybrid PON the central office OLT and the user Multiple wavelength channels are used for data transmission and reception between the side ONUs, that is, the hybrid PON system is a multi-wavelength PON. system.
- each ONU operates in one of the wavelength channels, and in the downlink direction, the OLT broadcasts the downlink data to the plurality of wavelength channels corresponding to each of the wavelength channels.
- the ONU uplink transmit wavelength and the downlink receive wavelength are dynamically adjustable. When the uplink transmit wavelength and the downlink receive wavelength are adjusted to uplink and downlink wavelengths of a certain wavelength channel, the ONUs may respectively work in the Wavelength channel.
- the OLT may need to instruct the ONU to perform wavelength switching during the operation of the ONU, for example, when the load of the wavelength channel A is too large.
- the OLT can control a part of the ONUs that are working in the wavelength channel A to switch to the wavelength channel B by adjusting the uplink transmission wavelength and the downlink reception wavelength by using a wavelength switching command.
- the OLT usually needs to buffer the downlink data sent to the ONU and suspend the uplink bandwidth authorization of the ONU.
- the ONU also needs to buffer the uplink data sent to the OLT.
- the OLT and the ONU resume normal service communication, and transmit and receive uplink and downlink data. That is, in the foregoing wavelength switching process, the service between the OLT and the ONU is in an interrupted state. Since the wavelength switching process generally needs to last for several hundred milliseconds to several seconds, the above wavelength switching method may reduce the user's voice, video, and the like. The user experience of real-time services may cause data loss and packet loss when traffic congestion or bursts occur, thus affecting service quality.
- the present application provides a wavelength switching method that can effectively reduce the impact of a multi-wavelength PON system on a service in an ONU wavelength switching process, so as to improve service quality and improve service quality. And, based on the wavelength switching method, the present application further provides a multi-wavelength PON system and its wavelength switching device.
- a multi-wavelength P0N wavelength switching method includes: when an optical network unit needs to switch from a first wavelength channel to a second wavelength channel, copying downlink data to be sent to the optical network unit into multiple copies, and respectively passing The plurality of wavelength channels respectively send the plurality of downlink data to the optical network unit, where the multiple wavelength channels include at least a first wavelength channel and a second wavelength channel; and send a downlink wavelength switching command to the optical network unit, Instructing the optical network unit to switch its downlink receiving wavelength to the downlink wavelength of the second wavelength channel; after determining that the downlink receiving wavelength of the optical network unit is successfully switched, stopping downlink data replication, only by using the second The wavelength channel transmits the downlink data to the optical network unit.
- a wavelength switching device for a multi-wavelength PON comprising: a data processing module, configured to: when an optical network unit needs to switch from a first wavelength channel to a second wavelength channel, copy downlink data to be sent to the optical network unit into a plurality of copies; the sending module, configured to separately send the multiple downlink data to the optical network unit by using multiple wavelength channels, where the multiple wavelength channels include at least a first wavelength channel and a second wavelength channel; And controlling the sending module to send a downlink wavelength switching command to the optical network unit, instructing the optical network unit to switch its downlink receiving wavelength to a downlink wavelength of the second wavelength channel, and determining the light
- the data processing module is controlled to stop downlink data replication, and the transmitting module is controlled to send the downlink data to the optical network unit only through the second wavelength channel.
- the optical line terminal copies downlink data and respectively passes multiple wavelength channels simultaneously before the optical network unit performs wavelength channel switching. Transmitting the downlink data, so as to ensure that the optical network unit can receive the downlink data from the corresponding wavelength channel regardless of the wavelength state of the current downlink receiving wavelength in the wavelength channel switching process, and therefore, even if the wavelength is switched
- the process needs to be continued for a relatively long period of time.
- the technical solution provided by the present application can effectively ensure that the downlink service is smooth during the wavelength channel switching process, that is, the downlink service is prevented from being interrupted during the wavelength channel switching process, thereby improving the user. For the user experience of real-time services such as voice and video, it effectively reduces data packet loss and ensures service quality.
- FIG. 1 is a schematic diagram of a network architecture of a passive optical network system based on a time division multiplexing mechanism.
- 2 is a schematic diagram of a network architecture of an embodiment of a multi-wavelength passive optical network system provided by the present application.
- FIG. 3 is a flow chart of a first embodiment of a wavelength switching method for a multi-wavelength passive optical network provided by the present application.
- FIG. 4 is a schematic diagram of a message format of a PLOAM message for carrying a wavelength switching command in the wavelength switching method of the multi-wavelength passive optical network shown in FIG.
- FIG. 5 is a second embodiment of a wavelength switching method for a multi-wavelength passive optical network provided by the present application Flow chart.
- FIG. 6 is a flow chart of a third embodiment of a wavelength switching method for a multi-wavelength passive optical network provided by the present application.
- FIG. 7 is a flow chart of a fourth embodiment of a wavelength switching method for a multi-wavelength passive optical network provided by the present application.
- FIG. 8 is a schematic diagram showing the frame structure of an EPON frame for carrying downlink data and downlink transmission wavelength information in the wavelength switching method of the multi-wavelength passive optical network shown in FIG. 7.
- FIG. 9 is a flow chart of a fifth embodiment of a wavelength switching method for a multi-wavelength passive optical network provided by the present application.
- FIG. 10 is a flowchart of a sixth embodiment of a wavelength switching method for a multi-wavelength passive optical network provided by the present application.
- FIG. 11 is a schematic structural diagram of an embodiment of a wavelength switching device for a multi-wavelength passive optical network provided by the present application. • concrete form
- a multi-wavelength passive optical network (Multiple) provided by an embodiment of the present application
- the multi-wavelength passive optical network system 100 includes at least one optical line termination (OLT) 110, a plurality of optical network units (ONUs) 120, and an optical distribution network (ODN) 130, wherein the optical line terminations 110 pass through
- ONT optical line termination
- the optical distribution network 130 is connected to the plurality of optical network units 120 in a point-to-multipoint manner, wherein the plurality of optical network units 120 share an optical transmission medium of the optical distribution network 130.
- the optical distribution network 130 may include a trunk optical fiber 131, an optical power splitting module 132, and a plurality of branch optical fibers 133, wherein the optical power
- the rate splitting module 132 may be disposed at a remote node (RN), which is connected to the optical line terminal 110 through the trunk optical fiber 131 on the one hand, and is respectively connected to the optical fiber terminal 133 through the plurality of branch optical fibers 133 on the one hand.
- RN remote node
- the communication link between the optical line terminal 110 and the plurality of optical network units 120 may include a plurality of wavelength channels, and the plurality of wavelength channels pass wave division
- the optical transmission medium of the optical distribution network 130 is shared by a multiplexing (WDM) method.
- Each optical network unit 120 can operate in one of the wavelength channels of the multi-wavelength passive optical network system 100, and each wavelength channel can carry the traffic of one or more optical network units 120.
- the optical network unit 120 operating in the same wavelength channel can share the wavelength channel by time division multiplexing (TDM).
- TDM time division multiplexing
- the multi-wavelength passive optical network system 100 has four wavelength channels as an example. It should be understood that, in practical applications, the multi-wavelength passive optical network system.
- the number of wavelength channels of 100 can also be determined according to the needs of the network.
- the four wavelength channels of the multi-wavelength passive optical network system 100 are respectively named as wavelength channel 1, wavelength channel 2, wavelength channel 3, and wavelength channel 4, wherein each wavelength channel is respectively A pair of uplink and downlink wavelengths is used.
- the upstream wavelength and the downstream wavelength of the wavelength channel 1 may be ⁇ and ⁇ (11, respectively, and the upstream wavelength and the downstream wavelength of the wavelength channel 2 may be ⁇ 2 and ⁇ , respectively.
- the upstream wavelength and the downstream wavelength of the wavelength channel 3 may be ⁇ 3 and ⁇ (13, respectively, and the upstream wavelength and the downstream wavelength of the wavelength channel 4 may be ⁇ 4 and ⁇ , respectively (14.
- Each wavelength channel may have a corresponding wavelength channel respectively.
- the identifier (for example, the channel numbers of the four wavelength channels may be 1, 2, 3, and 4 respectively), that is, the wavelength channel identifier has a matching relationship with the uplink and downlink wavelengths of the wavelength channel identified by the optical line terminal 110 and
- the optical network unit 120 can learn the uplink wavelength and the downlink wavelength of the wavelength channel according to the wavelength channel identifier.
- the wavelengths of the wavelength channel 1, the wavelength channel 2, the wavelength channel 3, and the wavelength channel 4 of the upstream wavelength ⁇ 1 ⁇ 4 can satisfy ⁇ 1 ⁇ 2 ⁇ 3 ⁇ 4, and the downlink wavelength ⁇ (11) ⁇ (14 can satisfy ⁇ (11 ⁇ (12 ⁇ (13 ⁇ (14.
- the optical line terminal 110 may include an optical coupler 111, a first wave.
- the plurality of downstream optical transmitters Tx1 to Tx4 are connected to the optical coupler 111 by the first wavelength division multiplexer 112, and the plurality of upstream optical receivers Rx1 to Rx4 pass the second wave.
- a sub-multiplexer 113 is coupled to the optical coupler 111, which is further coupled to the backbone fiber 131 of the optical distribution network 130.
- the emission wavelengths of the plurality of downstream optical transmitters Tx1 to Tx4 are different, and each of the downstream optical transmitters Tx1 to Tx4 may respectively correspond to one of the wavelength channels of the multi-wavelength passive optical network system 100, such as
- the emission wavelengths of the plurality of downlink light emitters Tx1 ⁇ Tx4 may be respectively ⁇ (11 ⁇ (14.
- the downlink light emitters Txl ⁇ Tx4 may respectively use their emission wavelengths ⁇ (11 ⁇ (14 will transmit downlink data to Corresponding wavelength channels are received by the optical network 120 working in the wavelength channel.
- the receiving wavelengths of the plurality of upstream optical receivers Rx1 R Rx4 may be different, and each of the upstream optical receivers Rxl ⁇ Rx4 also respectively correspond to one of the wavelength channels of the multi-wavelength passive optical network system 100.
- the receiving wavelengths of the plurality of upstream optical receivers Rx1 ⁇ Rx4 may be respectively ⁇ 1 ⁇ 4.
- Rxl ⁇ Rx4 can receive the uplink data sent by the optical network unit 120 operating in the corresponding wavelength channel by using the receiving wavelengths ⁇ 1 ⁇ 4, respectively.
- the first wavelength division multiplexer 112 is configured to respectively transmit the wavelengths of the plurality of downlink optical transmitters Tx1 TTx4 to ⁇ (11 ⁇ (14 downlink data for wavelength division multiplexing processing, and
- the optical coupler 111 transmits to the backbone optical fiber 131 of the optical distribution network 130 to provide the downlink data to the optical network unit through the optical distribution network 130.
- the optical coupler 111 can also be used for And providing uplink data from the plurality of optical network units 120 and having wavelengths of ⁇ ! ⁇ !4 to the second wavelength division multiplexer 113, where the second wavelength division multiplexer 113 can The uplink data of the wavelengths ⁇ 1 to ⁇ 4 are demultiplexed to the upstream optical receivers Rx1 to Rx4 for data reception.
- the processing module 114 may be a Media Access Control (MAC) module, which may specify a working wavelength channel for the plurality of optical network units 120 by wavelength negotiation, and according to a certain optical network unit 120. a working wavelength channel, providing downlink data to be sent to the optical network unit 120 to a downstream optical transmitter corresponding to the wavelength channel, so that The downlink optical transmitter transmits the downlink data to the wavelength channel.
- the processing module 114 can also perform Dynamic Bandwidth Allocation (DBA) for uplink transmission on each wavelength channel, and pass the TDM mode.
- DBA Dynamic Bandwidth Allocation
- the optical network unit 120 multiplexed to the same wavelength channel allocates an uplink transmission slot to authorize the optical network unit 120 to transmit uplink data through its corresponding wavelength channel in a designated time slot.
- the uplink transmit wavelength and the downlink receive wavelength of each optical network unit 120 are adjustable, and the optical network unit 120 can respectively set its own uplink transmit wavelength and downlink receive wavelength according to the wavelength channel specified by the optical line terminal 110.
- the uplink wavelength and the downlink wavelength of the wavelength channel are adjusted, so that uplink and downlink data transmission and reception are performed through the wavelength channel. For example, if the optical line terminal 110 indicates that an optical network unit 120 is operating to the wavelength channel 1 during the wavelength negotiation process, the optical network unit 120 may adjust its own uplink transmit wavelength and downlink receive wavelength to the first.
- Upstream wavelength ⁇ and first downlink wavelength ⁇ (11 ; if the optical line terminal 110 indicates that the optical network unit 120 operates to the wavelength channel 3, the optical network unit 120 can transmit its own uplink transmit wavelength and downlink receive The wavelength is adjusted to the third upstream wavelength ⁇ 3 and the first downstream wavelength ⁇ (13, respectively).
- the optical network unit 120 can include an optical coupler 121, a downstream optical receiver 122, an upstream optical transmitter 123, and a processing module 124.
- the downstream optical receiver 122 and the upstream optical transmitter 123 are connected to the branch optical fiber corresponding to the optical network unit 120 through the optical coupler 121.
- the optical coupler 121 can provide the uplink data sent by the upstream optical transmitter 123 to the branch optical fiber of the optical distribution network 130 to be sent to the optical line terminal 110 through the optical distribution network 130;
- the optical coupler 121 can also provide downlink data sent by the optical line terminal 110 through the optical distribution network 130 to the downlink optical receiver 122 for data reception.
- the processing module 124 may be a MAC module, which may perform wavelength negotiation with the optical line terminal 110, and adjust a receiving wavelength of the downlink optical receiver 122 according to a wavelength channel specified by the optical line terminal 110.
- the emission wavelength of the upstream light emitter 123 ie, adjusting the optical network
- a downlink receiving wavelength and an uplink transmitting wavelength of the unit 120 so that the optical network unit 120 operates in a wavelength channel designated by the optical line terminal 110; in addition, the processing module 124 may further be configured according to the optical line terminal 110.
- the upstream optical transmitter 123 is controlled to transmit uplink data in a designated time slot.
- the multi-wavelength passive optical network system 100 When the multi-wavelength passive optical network system 100 is in operation, if the number of the optical network units 120 on the line is large, it is desirable that a part of the optical network unit 120 operates in the wavelength channel 1, and the part works in the office.
- the wavelength channel 2 is partially operated at the wavelength channel 3, partially operating in the wavelength channel 4, and the number of optical network units 120 of each wavelength channel is substantially equal.
- the number of optical network units 120 of each wavelength channel may be different due to the user moving up and down, etc., for example, there may be a large number of optical network units 120 of a certain wavelength channel, and The number of optical network units 120 of the other or more wavelength channels is less or even the wavelength channels that are not used by the optical network unit 120, i.e., the load imbalance of the wavelength channels occurs.
- the load of the wavelength channel used by the more optical network unit 120 is heavier, and the optical network unit 120 operating in the same wavelength channel uses the TDM mode for service multiplexing, when the load of one wavelength channel is excessive.
- the multi-wavelength passive optical network system 100 can adopt the wavelength switching method provided by an embodiment of the present application.
- the optical line terminal 110 can indicate part of the light.
- the network unit 120 performs wavelength switching, so that the part of the optical network unit 120 switches to a lightly loaded wavelength channel or an idle wavelength channel, thereby preventing normal services from being affected due to excessive load of a certain wavelength channel.
- the wavelength channel switching of the multi-wavelength passive optical network 100 may only involve downlink receiving wavelength switching or uplink transmission wavelength switching of the optical network unit 120.
- the multi-wavelength passive light may also include switching of the downlink receiving wavelength and uplink transmission wavelength switching of the optical network unit 120.
- FIG. 3 is a flowchart of a method for wavelength switching of a multi-wavelength passive optical network according to an embodiment of the present application.
- the wavelength switching method is mainly related to the downlink receiving wavelength switching of the optical network unit 120.
- the optical network unit 120 can effectively prevent the downlink service interruption in the downlink receiving wavelength switching process.
- the wavelength switching method may include:
- step S10 the optical line terminal 110 determines that it is required to instruct the optical network unit 120 to switch from the first wavelength channel to the second wavelength channel.
- the optical line terminal 110 can detect the uplink and downlink traffic load conditions of the respective wavelength channels of the multi-wavelength passive optical network 100 in real time, and when detecting that the multi-wavelength passive optical network 100 has a wavelength channel load imbalance, For example, when the downlink load of the wavelength channel 1 is too heavy, the downlink load of the wavelength channel 3 is light, and the downlink load of the wavelength channels 2 and 4 is normal, the optical line terminal 100 can determine that it is required to indicate that the original operation is in the wavelength channel 1.
- the part of the optical network unit 120 switches to the wavelength channel 3 for downlink service reception, that is, the optical line terminal 110 can determine that the part of the optical network unit 120 needs to downlink its downlink receiving wavelength from the wavelength channel 1
- the wavelength ⁇ (11 is switched to the downstream wavelength ⁇ of the wavelength channel 3 (13.
- the optical line terminal 110 may also be The need for energy saving or replacement of the optical transceiver device is used to determine whether the optical network unit 120 needs to be instructed to perform wavelength switching.
- the optical line terminal 110 may determine that the optical line terminal 110 is based on energy saving requirements.
- the optical network unit 120 needs to be instructed to switch from the original wavelength channel to the wavelength channel having the bandwidth resource, and the original wavelength channel is turned off to reduce the overall power consumption of the multi-wavelength passive optical network system 100 to achieve energy saving.
- the optical line terminal 110 detects that a certain optical transceiver device (such as a downlink optical transmitter or an upstream optical receiver) is faulty or has performance degradation, it may be determined that the original needs to be indicated.
- the optical network unit 120 working in the wavelength channel of the optical transceiver device switches to another wavelength channel for service transmission and reception, so as to avoid affecting the normal salesman due to the failure or performance degradation of the optical transceiver device, and thus the maintenance personnel can The optical transceiver device that is faulty or degraded is replaced.
- the optical line terminal 100 can also instruct the optical network unit 120 to switch back to the original working channel as needed.
- Step S11 the optical line terminal 110 copies the downlink data that is to be sent to the optical network unit 120 through the first wavelength channel, and respectively passes through at least the first wavelength channel and the second wavelength channel.
- the plurality of wavelength channels simultaneously transmit the downlink data.
- the optical line terminal 110 may copy the downlink data to be sent to the optical network unit 120 into multiple copies before instructing the optical network unit 120 to perform wavelength switching, and respectively perform the multiple downlinks.
- the data is modulated and transmitted to the output lights of the plurality of downlink optical transmitters Tx1 to Tx4 to transmit downlink data to the optical network unit 120 through multiple wavelength channels.
- the multiple wavelength channels may be all wavelength channels of the multi-wavelength passive optical network 100, that is, the wavelength channel 1 to the wavelength channel 4.
- the optical line terminal 110 may The downlink data is copied into four parts and modulated respectively to the wavelengths provided by the downstream optical transmitters Tx1 to Tx4, which are respectively ⁇ (11 ⁇ (14 output light, thereby achieving simultaneous transmission to the light through the wavelength channel 1 to the wavelength channel 4).
- the network unit 120 sends the downlink data.
- the optical network unit 120 performs wavelength switching, usually by using a temperature control or an electronic control, and adopting a downlink receiving wavelength from the original wavelength channel (ie, the The downstream wavelength of the first wavelength channel is gradually adjusted to the downstream wavelength of the target wavelength channel (ie, the second wavelength channel), so the above wavelength adjustment process is a relatively slow process, which needs to go through a certain period of time.
- the downlink receiving wavelength of the optical network unit 120 needs to undergo different wavelength values during the time period, but the downlink data sent by the optical line terminal 110 is carried in the All wavelength channels of the multi-wavelength passive optical network system 100, so that at any time, regardless of the downlink receiving wavelength of the optical network unit 120 being adjusted to that wavelength value, the wavelength channel corresponding to the current wavelength value can be received.
- the downlink data is described to ensure that the downlink service is smooth during the wavelength channel switching process.
- the multiple wavelength channels may also include only the wavelength channel associated with the wavelength channel switching, wherein the wavelength channel associated with the wavelength channel switching may be from the original wavelength channel (ie, the The downstream wavelength of the first wavelength channel is switched to the wavelength channel corresponding to the plurality of downlink wavelength values during the downlink wavelength of the target wavelength channel (ie, the second wavelength channel).
- the optical network unit 120 adjusts its downstream receiving wavelength from the downstream wavelength ⁇ of the wavelength channel 1 (11)
- the downstream wavelength ⁇ of the wavelength channel 3 (in the process, the downlink receiving wavelength of the optical network unit 120 needs to pass ⁇ (11, ⁇ (12 and ⁇ (13 three correlation wavelength values, in this case,
- the multiple wavelength channels associated with wavelength channel switching include the downstream emission wavelengths of ⁇ (11, ⁇ (12 and ⁇ (wavelength channel 1 to wavelength channel 3 of 13).
- Step S12 The optical line terminal 110 sends a downlink wavelength switching command to the optical network unit 120, where the wavelength switching command is used to instruct the optical network unit 120 to switch to the second wavelength channel for downlink service reception.
- the downlink wavelength switching command may include channel identification information of a target wavelength channel (ie, the second wavelength channel) to which the optical network unit 120 needs to be switched, or a target that the optical network unit 120 needs to switch to.
- Downlink receiving wavelength ie, the downstream wavelength of the second wavelength channel.
- the downlink wavelength switching command may also carry the wavelength switching type information, and is used to instruct the optical network unit 120 to perform downlink receiving wavelength switching.
- the optical line terminal 110 may pass a Physical Layer Operations (Administration and Maintenance, PLOAM) message, an Optical Network Terminal Management and Control Interface (OMCI) message. a Multi-Point Control Protocol (MPCP) message or an Operation Management and Maintenance (OAM) message to carry the downlink wavelength switching command.
- PLOAM Physical Layer Operations
- OMCI Optical Network Terminal Management and Control Interface
- MPCP Multi-Point Control Protocol
- OAM Operation Management and Maintenance
- the specific message format such as field value and field length, may be used.
- the optical line terminal 110 may also carry the downlink wavelength switching command by using a newly defined message.
- FIG. 4 is a schematic diagram of a message format of a PLOAM message, where the PLOAM message usually includes an optical network unit identifier (ONU ID) field and a message identifier (Message ID). ) Field, Sequence No field, Data field, and Integrity Check field.
- the wavelength switching type information and the wavelength switching related information such as the target wavelength channel identifier information or the target downlink receiving wavelength information may be carried in a data field of the PLOAM message, for example, the wavelength switching command may be adopted.
- Step S13 The optical network unit 120 switches the downlink receiving wavelength to the downlink wavelength of the second wavelength channel according to the indication of the downlink wavelength switching command.
- the optical network unit 120 may learn, by using the wavelength switching related information carried by the downlink wavelength switching command, that the optical line terminal 110 specifies It needs to switch to the second wavelength channel, so that its downstream optical receiver 122 is controlled to adjust its downlink receiving wavelength from the downstream wavelength of the first wavelength channel to the downstream wavelength of the second wavelength channel.
- the optical network unit 120 may receive the downlink data sent by the optical line terminal 110 from the corresponding wavelength channel according to the downlink receiving wavelength of the current time in the wavelength channel switching process. Specifically, the optical network unit 110 transmits the downlink data to the multiple wavelength channels for transmission at the same time. Therefore, the optical network unit 120 performs the wavelength switching process regardless of the optical network unit 120 at a certain moment. Which wavelength value is the current downlink receiving wavelength, which can be connected from the optical line terminal 110 through a wavelength channel corresponding to the current downlink receiving wavelength. The downlink data is received to avoid downlink service interruption during the wavelength switching process.
- Step S14 the optical network unit 120 returns a downlink wavelength switching response to the optical line terminal 110 to notify whether the downlink wavelength switching is successful.
- the wavelength switching result may be reported to the optical line terminal 110 by returning a downlink wavelength switching response to the optical line terminal 110.
- the downlink wavelength switching response may include a downlink receiving wavelength that is adjusted by the optical network unit 120 after performing wavelength switching.
- the downlink wavelength switching response may also be carried by a PLOAM message, an OMCI message, an MPCP message, an OAM message, or other newly defined message.
- the PLOAM message is used to carry the downlink wavelength switching response.
- the downlink wavelength switching response may be in the format shown in the following table:
- step S15 the optical line terminal 110 determines the current downlink receiving wavelength of the optical network unit 120 according to the downlink wavelength switching response returned by the optical network unit 120.
- the optical line terminal 110 may receive the downlink wavelength switching response returned by the optical network unit 120, if the downlink wavelength switching response includes a downlink receiving wavelength field, the optical line terminal 110 may The downlink receiving wavelength field acquires a downlink receiving wavelength that is adjusted by the optical network unit 120 after performing wavelength switching, that is, a current downlink receiving wavelength of the optical network unit 120. Since the downlink receiving wavelength field of the wavelength switching response is an optional field, it should be understood that step S15 is an optional step, and only the optical network unit 120 carries its performing wavelength switching in the downlink wavelength switching response. Subsequent downlink receiving wavelength signal The optical line terminal 110 only needs to perform step S15.
- the optical line terminal 110 may locally maintain a downlink service forwarding table or an information mapping table of the optical network unit and the downlink receiving wavelength, where the forwarding table or the information mapping table may include multiple tables.
- Each of the entries includes an optical network unit information field and a downlink receiving wavelength field, respectively, for indicating a correspondence between each optical network unit 120 and the downlink receiving wavelength in the multi-wavelength passive optical network system 100. If the optical line terminal 110 maintains the forwarding table or the mapping table locally, the optical line terminal 100 may further further determine the downlink receiving wavelength that is adjusted after the optical network unit 120 performs wavelength switching. The downlink receiving wavelength information field in the related entry of the forwarding table or the mapping table is refreshed.
- step S16 the optical line terminal 110 stops the replication of the downlink data, and only transmits the downlink data through the second wavelength channel in which the optical network unit 120 operates after the wavelength channel switching.
- the optical line terminal 110 may stop copying the downlink data in step S11, but only The downlink data is modulated to the downlink wavelength of the second wavelength channel, so that the downlink data is sent to the optical network unit 120 only through the second wavelength channel.
- the optical line terminal 110 copies the downlink data and passes through multiple before the optical network unit 120 performs the wavelength channel switching.
- the wavelength channel simultaneously transmits the downlink data, thereby ensuring that the optical network unit 120 can receive the downlink data regardless of the wavelength state of the current downlink receiving wavelength in the wavelength channel switching process, and therefore, even if the wavelength switching process
- the wavelength switching method provided by the embodiment of the present application can effectively ensure that the downlink service is smooth during the wavelength channel switching process, that is, the downlink service is interrupted during the wavelength channel switching process, thereby improving the downlink service. Users can reduce data packet loss and ensure service quality for user experience of real-time services such as voice and video.
- Embodiment 2 also provides a wavelength switching method for another multi-wavelength passive optical network, which is mainly directed to the uplink transmit wavelength switching of the optical network unit 120.
- the optical network unit 120 can be effectively avoided.
- An uplink service interruption occurs during uplink receiving wavelength switching.
- FIG. 5 which is a flowchart of a method for wavelength switching of a multi-wavelength passive optical network according to a second embodiment of the present application, the wavelength switching method may include:
- step S20 the optical line terminal 110 determines that it is required to instruct the optical network unit 120 to switch from the first wavelength channel to the second wavelength channel.
- the optical line terminal 110 detects that the load of the multiple wavelength channels of the multi-wavelength passive optical network system 100 is unbalanced, or the optical line terminal 110 needs energy saving, or the optical line.
- the terminal 100 finds that its optical transceiver device is faulty or degraded, it can be determined that the associated optical network unit 120 needs to be switched from the original working channel (ie, the first wavelength channel) to the target wavelength channel (ie, the second wavelength channel).
- Step S21 the optical line terminal 110 updates the bandwidth authorization for the optical network unit 120, and assigns the same to the optical network unit 120 in multiple wavelength channels including the first wavelength channel and the second wavelength channel. Uplink transmission slot.
- the optical line terminal 110 performs bandwidth authorization only on the original wavelength channel (ie, the first wavelength channel) in which the optical network unit 120 operates, that is, according to the location.
- the traffic condition of the first wavelength channel is subjected to dynamic bandwidth allocation (DBA) scheduling, and the optical network unit 120 is authorized to transmit uplink time slots.
- DBA dynamic bandwidth allocation
- the optical line terminal 110 determines that the optical network unit 120 performs wavelength switching, it may respectively give the optical network unit to a plurality of different wavelength channels before issuing the wavelength switching indication to the optical network unit 120. 120.
- the same time slot is reserved to authorize the optical network unit 120 to follow the wavelength of the uplink channel adjusted by the optical network unit 120 at the current time during the wavelength channel switching, and to the light through the corresponding wavelength channel.
- Line terminal 110 transmits uplink data.
- the plurality of wavelength channels may be all wavelength channels of the multi-wavelength passive optical network 100, that is, the wavelength channel 1 to the wavelength channel 4.
- the plurality of wavelength channels may also include only the wavelength channel associated with the wavelength channel switching, that is, switching from the upstream wavelength of the original wavelength channel (ie, the first wavelength channel) to the target wavelength channel (ie, the second wavelength channel)
- the upstream wavelength process needs to go through a wavelength channel corresponding to a plurality of upstream wavelength values.
- the first wavelength channel is the wavelength channel 4
- the second wavelength channel is the wavelength channel 2
- the wavelength of the wavelength channel 1 to the wavelength channel 4 is ⁇ 1 ⁇ 4, which satisfies ⁇ 1 ⁇ 2 ⁇ 3 ⁇ 4 Therefore, the plurality of wavelength channels related to the wavelength channel switching include the wavelength channel 2 to the wavelength channel 4 which are respectively ⁇ 2, ⁇ 3, and ⁇ 4.
- step S22 the optical line terminal 110 sends an uplink wavelength switching command to the optical network unit 120, where the uplink wavelength switching command is used to instruct the optical network unit 120 to switch to the second wavelength channel for uplink service transmission.
- the uplink wavelength switching command may include wavelength identification information of a target wavelength channel (ie, the second wavelength channel) to which the optical network unit 120 needs to be switched, or a target that the optical network unit 120 needs to switch to.
- the uplink transmission wavelength ie, the upstream wavelength of the second wavelength channel.
- the wavelength switching command may also carry the wavelength switching type information, and is used to instruct the optical network unit 120 to perform uplink transmission wavelength switching.
- the wavelength switching command may also be carried by a PLOAM message, an OMCI message, an MPCP message, a ⁇ message, or other newly defined message, and the specific message format of the wavelength switching command may refer to Embodiment 1 The message format described in step S12.
- Step S23 the optical network unit 120 switches its uplink transmission wavelength to the uplink wavelength of the second wavelength channel according to the indication of the uplink wavelength switching command.
- the optical network unit 120 may learn from the uplink wavelength switching command that the optical line terminal 110 specifies that it needs to switch to the The second wavelength channel performs uplink service transmission. Therefore, the optical network unit 120 controls its upstream optical transmitter 123 to adjust its uplink transmission wavelength from the uplink wavelength of the first wavelength channel to the uplink of the second wavelength channel. wavelength. And, switching at wavelength In the process, the optical network unit 120 may send uplink data to the optical line terminal 110 by using a wavelength channel corresponding to the current uplink transmission wavelength in a time slot authorized by the optical line terminal 110.
- the optical network unit 110 authorizes the same uplink transmission time slot for the optical network unit 120 in the multiple wavelength channels, and therefore, the optical network unit 120 performs the uplink wavelength switching process, regardless of the At which wavelength value of the uplink transmission wavelength of the optical network unit 120 at a certain time, the uplink data may be sent to the optical line terminal 110 through a wavelength channel corresponding to the current uplink transmission wavelength, thereby avoiding occurrence in the wavelength switching process.
- the uplink service was interrupted.
- Step S24 the optical network unit 120 returns an uplink wavelength switching response to the optical line terminal 110 to notify whether the uplink wavelength switching is successful.
- the uplink wavelength switching response may also be carried by a PLOAM message, an OMCI message, an MPCP message, an OAM message, or other newly defined message, and the specific message format of the uplink wavelength switching command may be referenced and implemented.
- the message format described in the step S14 of the first example is mainly that the downlink receiving wavelength field of the downlink wavelength switching response in step S14 needs to be replaced with the uplink transmitting wavelength field, and the optical network unit 120 is carried in the wavelength channel.
- Step S25 the optical line terminal 110 determines the current uplink transmission wavelength of the optical network unit 120 according to the uplink wavelength switching response returned by the optical network unit 120.
- the optical line terminal 110 may obtain, from the uplink transmit wavelength field, an uplink that is adjusted by the optical network unit 120 after performing an uplink wavelength switch.
- the emission wavelength Since the uplink wavelength field of the wavelength switching response is an optional field, step S15 is an optional step.
- step S25 if the optical line terminal 110 locally maintains an information mapping table of the optical network unit and the uplink transmission wavelength, it is determined that the optical network unit 120 is When the uplink transmission wavelength adjusted after the uplink wavelength switching is performed, the optical line terminal 110 may further further uplink the uplink wave in the related entry of the mapping table.
- Step S26 the optical line terminal 110 stops the bandwidth authorization of the optical network unit 120 in other wavelength channels except the second wavelength channel, and only authorizes the optical network unit 120 in the same uplink transmission time slot.
- the second wavelength channel transmits data.
- the optical line terminal 110 may stop the same time slot in the multiple wavelength channels in step S21 as described.
- the bandwidth of the optical network unit 120 is authorized, and the uplink transmission time slot is allocated to the optical network unit 120 only in the second wavelength channel, so that the optical network unit 120 passes only the second after completing the wavelength channel switching.
- the wavelength channel transmits the uplink data to the optical line terminal 110.
- the optical line terminal 110 will be in a plurality of wavelength channels of different wavelengths before the optical network unit 120 performs wavelength channel switching.
- the same time slot is simultaneously allocated to the optical network unit 120 for the uplink transmission time slot, thereby ensuring that the optical network unit 120 can go to the optical line terminal 110 regardless of the wavelength state of the current uplink transmission wavelength during the wavelength channel switching process.
- the uplink data is sent, so that the wavelength switching method provided by the embodiment of the present application can effectively ensure that the uplink service is smooth during the wavelength channel switching process, that is, the uplink service is avoided, even if the wavelength switching process needs to be continued for a relatively long period of time.
- the wavelength channel switching process it is in an interrupted state to ensure service quality.
- the optical network unit 120 can also adjust the uplink transmission wavelength and the downlink reception wavelength in the same wavelength channel switching process, please refer to the figure. 6.
- the flowchart of the wavelength switching method of the multi-wavelength passive optical network provided by the third embodiment of the present application, the wavelength switching method may include: Step S30, the optical line terminal 110 determines that the optical network unit 120 needs to be indicated. Switching from the first wavelength channel to the second wavelength channel.
- Step S31 the optical line terminal 110 performs the downlink data of the optical network unit 120. Copying, and simultaneously transmitting the downlink data through multiple wavelength channels including at least the first wavelength channel and the second wavelength channel, and on the other hand, the optical line terminal 110 is further updated for the optical network
- the bandwidth authorization of unit 120 assigns the same uplink transmission slot to the optical network unit 120 in the plurality of wavelength channels.
- Step S32 the optical line terminal 110 sends a wavelength switching command to the optical network unit 120, where the wavelength switching command is used to instruct the optical network unit 120 to switch to the second wavelength channel for downlink service reception and uplink service. send.
- Step S33 the optical network unit 120 switches its downlink reception wavelength to the downlink wavelength of the second wavelength channel according to the indication of the wavelength switching command, and switches its uplink transmission wavelength to the second wavelength channel. Upstream wavelength.
- Step S34 the optical network unit 120 returns a wavelength switching response to the optical line terminal 110 to inform whether the wavelength switching is successful.
- step S35 the optical line terminal 110 determines the current downlink receiving wavelength and the uplink transmitting wavelength of the optical network unit 120 according to the wavelength switching response returned by the optical network unit 120.
- Step S36 the optical line terminal 110 stops the replication of the downlink data, transmits the downlink data only through the second wavelength channel switched by the optical network unit 120, and stops the other wavelength channel pairs except the second wavelength channel.
- the bandwidth authorization of the optical network unit 120 only authorizes the optical network unit 120 to transmit uplink data in the second wavelength channel in the same time slot.
- the wavelength switching method provided in this embodiment can not only ensure that the downlink service is smooth during the wavelength channel switching process, that is, the downlink service is prevented from being in the middle of the wavelength channel switching process. In the off state, it is also possible to ensure that the uplink service is prevented from appearing in the wavelength channel switching process, thereby ensuring service quality.
- the optical line terminal 110 may fill the optical line terminal in a downlink data frame carrying the downlink data. Downlink transmission wavelength information of 110, so that the optical network unit 120 checks the correctness of its current downlink reception wavelength; and the optical network unit 120 also fills the optical network in an uplink data frame that carries the uplink data.
- the uplink transmit wavelength information and/or the downlink receive wavelength information of the unit 120 is configured to facilitate the optical line terminal 110 to check the correctness of the uplink transmit wavelength and the downlink receive wavelength of the optical network unit 120.
- the optical network unit 120 does not need to return a wavelength switching response to the optical line terminal 110 after completing the wavelength switching, and the optical line terminal 110 can directly send the uplink data frame from the optical network unit 120.
- the uplink transmission wavelength information and/or the downlink reception wavelength information of the bearer are used to determine whether the wavelength switching of the optical network unit 120 is successful.
- FIG. 7 is a flowchart of a wavelength switching method for a multi-wavelength passive optical network according to a fourth embodiment of the present application.
- the embodiment is mainly related to the downlink receiving wavelength adjustment of the optical network unit 120, and the wavelength switching method may include:
- Step S40 the optical line terminal 110 determines that it is required to instruct the optical network unit 120 to switch from the first wavelength channel to the second wavelength channel.
- Step S41 the optical line terminal 110 copies the downlink data that is to be sent to the optical network unit 120 through the first wavelength channel into multiple copies, and respectively includes at least the first wavelength channel and the second wavelength.
- the plurality of wavelength channels of the channel simultaneously send the downlink data frame, where the downlink data frame is used to carry the downlink data, and the downlink data frames respectively sent through the respective wavelength channels further include downlink transmission wavelength information of the optical line terminal That is, the plurality of downlink data frames are respectively filled with downlink wavelength information for performing a wavelength channel for transmitting the downlink data frame.
- the downlink data frame may be an Ethernet frame with a Logical Link Identification (LLID) used by an Ethernet Passive Optical Network (EPON) (hereinafter referred to as an EPON frame), and the Gigabit is not A downlink data frame such as a GPON Transmission Convergence (GTC) frame and a XGPON Transmission Convergence (XGTC) frame used by the XGPON to carry the downlink data and the downlink Transmit wavelength information.
- GTC GPON Transmission Convergence
- XGTC XGPON Transmission Convergence
- An EPON frame is taken as an example.
- FIG. 8 it is a schematic diagram of a frame format of an EPON frame according to an embodiment of the present invention.
- the EPON frame includes an LLID field and a Payload field, where the downlink data may be
- the downlink transmission wavelength information may be carried in the LLID field.
- the LLID field includes a mode subfield and an LLID subfield.
- the LLID field since the LLID field carries the downlink transmission wavelength information, the LLID field includes the two subfields.
- the method further includes a wavelength information subfield, configured to carry the downlink transmit wavelength information.
- the downlink transmission wavelength information may also be carried by a PLOAM message, an OMCI message, an MPCP message, an OAM message, or other newly defined message.
- step S42 the optical line terminal 110 sends a downlink wavelength switching command to the optical network unit 120, where the downlink wavelength switching command is used to instruct the optical network unit 120 to switch to the second wavelength channel for downlink service reception.
- Step S43 the optical network unit 120 switches the downlink receiving wavelength to the downlink wavelength of the second wavelength channel according to the indication of the downlink wavelength switching command, and sends the downlink receiving wavelength information to the uplink data frame to send to the uplink data frame.
- the optical line terminal 110 The optical line terminal 110.
- the optical network unit 120 may control the downlink optical receiver 122 to adjust the downlink receiving wavelength from the downlink wavelength switching command.
- the optical network unit 120 may further obtain downlink transmission wavelength information of each wavelength channel from the downlink data frame sent by the optical line terminal 110, and determine the correctness of the current downlink reception wavelength according to the downlink transmission wavelength information. And according to the judgment The result of the break determines whether further adjustments to the current downlink receive wavelength are required.
- the optical network unit 120 may also carry the current downlink receiving wavelength information in the uplink data frame and send the uplink data frame when it sends the uplink data frame to the optical line terminal 110.
- the uplink data frame may be an EPON frame, a GTC frame, or an XGTC frame.
- the specific format may refer to the description of step S41, taking an EPON frame as an example, and step S42.
- the downlink receiving wavelength information may also be carried in a wavelength information subfield of the LLID field.
- Step S44 the optical line terminal 110 waits for a preset delay time after transmitting the downlink wavelength switching command to the optical network unit 120, and then reads the downlink receiving wavelength information from the uplink data frame from the optical network unit 120. And determining, according to the downlink receiving wavelength information, whether the wavelength switching of the optical network unit 120 is successful.
- the optical line terminal 110 does not need to wait for the optical network unit 120 to return after transmitting the downlink wavelength switching command to the optical network unit 120.
- the wavelength switching response but waiting for a predetermined delay time, and then reading the downlink receiving wavelength information of the optical network unit 120 from the uplink data frame sent by the optical network unit 120, and according to the downlink receiving wavelength information It is determined whether the wavelength switching of the optical network unit 120 is successful.
- the length of the delay time is mainly determined by the time required for wavelength adjustment and stabilization of the optical transceiver device of the optical network unit 120, and the optical line can be ensured by waiting for the delay time.
- the terminal 110 acquires downlink receiving wavelength information after the optical network unit 120 completes downlink receiving wavelength switching.
- the optical line terminal 110 determines, according to the downlink receiving wavelength information, that the downlink receiving wavelength of the optical network unit 120 after the wavelength switching does not match the expected, that is, the optical network unit 120 does not successfully
- the downlink receiving wavelength is adjusted to the downlink wavelength of the second wavelength channel, and the optical line terminal 110 may send a downlink wavelength switching command to the optical network unit 120, instructing the optical network unit 120 to perform downlink receiving wavelength adjustment again. That is, steps S42 to S44 are repeated until the downlink reception wavelength switching of the optical network unit 120 is successful.
- Step S45 the optical line terminal 110 stops the replication of the downlink data, and only transmits the downlink data through the second wavelength channel in which the optical network unit 120 operates after the wavelength channel switching.
- the wavelength switching method provided by the embodiment can also effectively ensure the wavelength.
- the downlink service is smooth, that is, the downlink service is prevented from being interrupted during the switching of the wavelength channel.
- FIG. 9 is a flowchart of a wavelength switching method for a multi-wavelength passive optical network according to a fifth embodiment of the present application.
- the embodiment is mainly related to the uplink transmission wavelength adjustment of the optical network unit 120, and the wavelength switching method may include:
- step S50 the optical line terminal 110 determines that it is required to instruct the optical network unit 120 to switch from the first wavelength channel to the second wavelength channel.
- Step S51 the optical line terminal 110 updates the bandwidth authorization for the optical network unit 120, and assigns the same to the optical network unit 120 in multiple wavelength channels including the first wavelength channel and the second wavelength channel. Uplink transmission slot.
- step S52 the optical line terminal 110 sends an uplink wavelength switching command to the optical network unit 120, where the uplink wavelength switching command is used to instruct the optical network unit 120 to switch to the second wavelength channel for uplink service transmission.
- Step S53 the optical network unit 120 switches the uplink transmission wavelength to the uplink wavelength of the second wavelength channel according to the indication of the uplink wavelength switching command, and sends the uplink transmission wavelength information to the uplink data frame to send to the uplink data frame.
- the optical line terminal 110 The optical line terminal 110.
- the optical network unit 120 may carry its current uplink transmit wavelength information on the uplink when it sends an uplink data frame to the optical line terminal 110.
- the data frame is sent to the optical line terminal.
- the uplink data frame may be an EPON frame, a GTC frame, or an XGTC frame. Taking an EPON frame as an example, the uplink transmit wavelength information may be carried in a wavelength information subword of the LLID field. Paragraph.
- Step S54 the optical line terminal 110 waits for a preset delay time after transmitting an uplink wavelength switching command to the optical network unit 120, and then reads the uplink transmission wavelength from an uplink data frame from the optical network unit 120. And determining, according to the uplink transmit wavelength information, whether the wavelength switching of the optical network unit 120 is successful.
- the optical line terminal 110 after the optical line terminal 110 sends an uplink wavelength switching command to the optical network unit 120, it does not need to wait for the optical network unit to return. Upstream wavelength switching response, but waiting for a predetermined delay time, and then reading the uplink transmission wavelength information of the optical network unit 120 from the uplink data frame sent by the optical network unit 120, and thereby determining the light Whether the wavelength switching of the network unit 120 is successful.
- the delay time waiting may also enable the optical line terminal 110 to acquire its uplink transmission wavelength information after the optical network unit 120 completes the uplink transmission wavelength switching.
- the optical line terminal 110 determines, according to the uplink transmission wavelength information, that the uplink transmission wavelength adjusted by the optical network unit 120 after the wavelength switching does not match the expected, that is, the optical network unit 120 is not successful. Adjusting the uplink transmit wavelength to the uplink wavelength of the second wavelength channel, the optical line terminal 110 may resend the uplink wavelength switch command to the optical network unit 120, instructing the optical network unit 120 to perform the uplink transmit wavelength again. Adjustment, that is, steps S52 to S54 are repeated until the uplink transmission wavelength switching of the optical network unit 120 is successful.
- Step S55 the optical line terminal 110 stops the bandwidth authorization of the optical network unit 120 in other wavelength channels except the second wavelength channel, and only authorizes the optical network unit 120 in the same uplink transmission time slot.
- the second wavelength channel transmits data.
- the wavelength switching method provided by the embodiment can also effectively ensure the wavelength.
- the uplink service is unblocked during the channel switching process, that is, the uplink service is interrupted during the switching of the wavelength channel to ensure the service quality.
- Embodiment 6 Please refer to FIG. 10 , which is a flowchart of a wavelength switching method for a multi-wavelength passive optical network according to a sixth embodiment of the present application.
- the embodiment of the present invention relates to the adjustment of the uplink transmit wavelength and the downlink receive wavelength of the optical network unit 120.
- the wavelength switching method may include:
- step S60 the optical line terminal 110 determines that it is required to instruct the optical network unit 120 to switch from the first wavelength channel to the second wavelength channel.
- Step S61 the optical line terminal 110 copies the downlink data of the optical network unit 120, and simultaneously transmits the plurality of wavelength channels through at least the first wavelength channel and the second wavelength channel.
- the downlink data on the other hand, the optical line terminal 110 also updates the bandwidth grant for the optical network unit 120, and allocates the same uplink transmission slot to the optical network unit 120 in the plurality of wavelength channels.
- Step S62 the optical line terminal 110 sends a wavelength switching command to the optical network unit 120, where the wavelength switching command is used to instruct the optical network unit 120 to switch to the second wavelength channel for downlink service reception and uplink service. send.
- Step S63 the optical network unit 120 switches its downlink reception wavelength to the downlink wavelength of the second wavelength channel according to the indication of the wavelength switching command, and switches its uplink transmission wavelength to the second wavelength channel.
- the uplink wavelength, and the optical network unit 120 transmits the downlink receiving wavelength information and the uplink transmitting wavelength information to the optical line terminal 110 in the uplink data frame.
- Step S64 the optical line terminal 110 waits for a preset delay time after transmitting a wavelength switching command to the optical network unit 120, and reads the downlink receiving wavelength information from an uplink data frame from the optical network unit 120. And transmitting, by the uplink, the wavelength information, and determining, according to the downlink receiving wavelength information and the uplink transmitting wavelength information, whether the wavelength switching of the optical network unit 120 is successful. If unsuccessful, the optical line terminal 110 instructs the optical network unit 120 to perform wavelength switching again.
- Step S65 the optical line terminal 110 stops the replication of the downlink data, and only sends the downlink data through the second wavelength channel in which the optical network unit 120 operates after the wavelength channel switching, and stops.
- the bandwidth authorization of the optical network unit 120 is terminated by other wavelength channels than the second wavelength channel, and only the optical network unit 120 is authorized to transmit data in the second wavelength channel in the same uplink transmission time slot.
- the specific working process of the steps related to the third embodiment in the wavelength switching method of the present embodiment can be referred to the description of the third embodiment, and is similar to the three-phase embodiment.
- the wavelength switching method provided by the embodiment is not only used in this embodiment.
- the downlink service can be effectively ensured during the wavelength channel switching process, that is, the downlink service is interrupted during the switching of the wavelength channel, and the terminal can be prevented from appearing in the wavelength channel switching process, thereby ensuring the service. quality.
- the present application further provides a wavelength switching device, which can be applied to the multi-wavelength passive optical network system shown in FIG. 2 .
- FIG. 11 is a schematic structural diagram of an embodiment of a wavelength switching device of a multi-wavelength passive optical network system provided by the present application.
- the wavelength switching device 700 may include:
- the data processing module 710 is configured to: when the optical network unit 120 needs to switch from the first wavelength channel to the second wavelength channel, copy the downlink data to be sent to the optical network unit 120 into multiple copies; and send the module 720, where Transmitting the plurality of downlink data to the optical network unit 120 by using a plurality of wavelength channels, where the plurality of wavelength channels include at least a first wavelength channel and a second wavelength channel;
- the control module 730 is configured to control the sending module 720 to send a downlink wavelength switching command to the optical network unit 120, instructing the optical network unit 120 to switch its downlink receiving wavelength to the downlink wavelength of the second wavelength channel, and After determining that the downlink receiving wavelength of the optical network unit 120 is successfully switched, controlling the data processing module to stop downlink data replication, and controlling the sending module 720 to send only the second wavelength channel to the optical network unit.
- the downlink data is configured to control the sending module 720 to send a downlink wavelength switching command to the optical network unit 120, instructing the optical network unit 120 to switch its downlink receiving wavelength to the downlink wavelength of the second wavelength channel, and After determining that the downlink receiving wavelength of the optical network unit 120 is successfully switched, controlling the data processing module to stop downlink data replication, and controlling the sending module 720 to send only the second wavelength channel to the optical network unit.
- the downlink data is configured to control the sending module 720 to send a downlink wavelength switching command to the optical network unit 120, instructing the optical network unit 120 to
- the plurality of wavelength channels include all the wavelength channels of the multi-wavelength passive optical network system 100, that is, the wavelength channel 1 to the wavelength channel 4; alternatively, the plurality of wavelength channels may also include only the The wavelength channel associated with the downlink wavelength switching, that is, the downlink receiving wavelength of the optical network unit 120 needs to undergo multiple downlink wavelength values during the process of switching from the downlink wavelength of the first wavelength channel to the downlink wavelength of the second wavelength channel. Corresponding wavelength channel.
- the wavelength switching device 700 may further include a receiving module 740 and a determining module 750.
- the receiving module 740 can be configured to receive a downlink wavelength switching response returned by the optical network unit 120, where the downlink wavelength switching response includes downlink receiving of the optical network unit 120 after wavelength switching.
- the determining unit 750 is configured to determine whether the downlink receiving wavelength switching of the optical network unit 120 is successful according to the downlink receiving wavelength information of the downlink wavelength switching response bearer.
- the receiving module 740 may be configured to receive an uplink wavelength switching response returned by the optical network unit 120, where the uplink wavelength switching response includes that the optical network unit 120 is The uplink transmission wavelength information after the wavelength switching; the determining module 750, configured to determine, according to the uplink transmission wavelength information, whether the uplink transmission wavelength switching of the optical network unit 120 is successful.
- the data processing module 710 is further configured to carry the downlink data obtained by the replication in multiple downlink data frames, where each downlink data frame further includes a downlink channel for transmitting the downlink data frame. Wavelength information.
- the wavelength switching apparatus 700 may further include a bandwidth allocation module 760, configured to update a bandwidth grant for the optical network unit 120, where the multiple wavelength channels are the light Network unit 120 allocates the same uplink transmission slot;
- the control module 730 is further configured to control the sending module 720 to send an uplink wavelength switching command to the optical network unit 120, instructing the optical network unit 120 to switch its uplink transmit wavelength to the second wavelength channel.
- Upstream wavelength after determining that the uplink transmit wavelength of the optical network unit 120 is successfully switched, controlling the bandwidth allocation module 760 to stop at the
- the other wavelength channels other than the second wavelength channel allocate an uplink transmission time slot to the optical network unit 120, and only the optical network unit 120 is authorized to transmit uplink data in an uplink transmission time slot of the second wavelength channel.
- the downlink wavelength switching command and the uplink wavelength switching command may be carried in the same control message that is sent to the optical network unit 120, where the control message is used to indicate that the optical network unit performs downlink receiving at the same time.
- Wavelength switching and upstream transmit wavelength switching.
- the receiving module 740 may be configured to receive uplink data sent by the optical network unit 120, and send a downlink wavelength switching command to the optical network unit 120 in the sending module 720. Then, waiting for the preset delay time, and then sending the uplink data frame from the optical network unit 120 to read the downlink receiving wavelength information of the optical network unit 120; the determining module 750 may be configured to be carried according to the uplink data frame.
- the downlink receiving wavelength information determines whether the downlink receiving wavelength switching of the optical network unit is successful.
- the receiving module 740 may be configured to receive uplink data sent by the optical network unit 120, and after the sending module 720 sends a downlink wavelength switching command to the optical network unit 120, Waiting for the preset delay time, and then sending the uplink data frame from the optical network unit 120 to read the uplink transmit wavelength information of the optical network unit 120.
- the determining module 750 may be configured to determine, according to the uplink transmit wavelength information, Whether the uplink transmission wavelength switching of the optical network unit 120 is successful.
- the transmitting module 720 may mainly include downlink light emission at the optical line terminal 110.
- the first and second wavelength division multiplexing devices 112; the receiving module 740 may be mainly included in the downstream optical receivers Rx1 to Rx4 and the second wavelength division multiplexing device 113 of the optical line terminal 110;
- the data processing module 710, the control module 730, the determining module 750, and the bandwidth allocation module 760 can be implemented by the processing module 114 (such as a MAC module) of the optical line terminal 110.
- the main function the specific working process of the function module, may refer to the wavelength switching method of the first embodiment to the sixth embodiment.
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Abstract
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Priority Applications (9)
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EP12837621.7A EP2731287A4 (en) | 2012-05-23 | 2012-05-23 | METHOD, SYSTEM AND DEVICE FOR WAVELENGTH WAVELENGTH LENGTH OF PASSIVE OPTICAL NETWORK (PON) MULTI-WAVELENGTH LENGTH |
JP2015512983A JP2015522992A (ja) | 2012-05-23 | 2012-05-23 | 多波長パッシブ光ネットワーク上での波長切替えのための方法、システム、および装置 |
KR1020147035057A KR20150008911A (ko) | 2012-05-23 | 2012-05-23 | 다파장 수동 광네트워크에서의 파장 스위칭 방법, 시스템, 및 장치 |
CN201280000515.0A CN103548292A (zh) | 2012-05-23 | 2012-05-23 | 多波长无源光网络的波长切换方法、***和装置 |
PCT/CN2012/075921 WO2013173983A1 (zh) | 2012-05-23 | 2012-05-23 | 多波长无源光网络的波长切换方法、***和装置 |
TW104113481A TW201531045A (zh) | 2012-05-23 | 2013-04-30 | 多波長無源光網路的波長切換方法、系統和裝置 |
TW102115374A TWI493900B (zh) | 2012-05-23 | 2013-04-30 | Wavelength switching method, system and device for multi - wavelength passive optical network |
US13/891,683 US20130315589A1 (en) | 2012-05-23 | 2013-05-10 | Method, system, and apparatus for wavelength switching on multi-wavelength passive optical network |
ARP130101773 AR091358A1 (es) | 2012-05-23 | 2013-05-22 | Metodo, sistema, y aparato para la conmutacion de longitud de onda en red optica pasiva de multiples longitudes de onda |
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PCT/CN2012/075921 WO2013173983A1 (zh) | 2012-05-23 | 2012-05-23 | 多波长无源光网络的波长切换方法、***和装置 |
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US13/891,683 Continuation US20130315589A1 (en) | 2012-05-23 | 2013-05-10 | Method, system, and apparatus for wavelength switching on multi-wavelength passive optical network |
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EP (1) | EP2731287A4 (zh) |
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Also Published As
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EP2731287A4 (en) | 2014-12-31 |
US20130315589A1 (en) | 2013-11-28 |
EP2731287A1 (en) | 2014-05-14 |
TW201531045A (zh) | 2015-08-01 |
CN103548292A (zh) | 2014-01-29 |
TWI493900B (zh) | 2015-07-21 |
TW201349771A (zh) | 2013-12-01 |
KR20150008911A (ko) | 2015-01-23 |
JP2015522992A (ja) | 2015-08-06 |
AR091358A1 (es) | 2015-01-28 |
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