WO2016084953A1 - フレーマ、及びフレーミング方法 - Google Patents
フレーマ、及びフレーミング方法 Download PDFInfo
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- WO2016084953A1 WO2016084953A1 PCT/JP2015/083466 JP2015083466W WO2016084953A1 WO 2016084953 A1 WO2016084953 A1 WO 2016084953A1 JP 2015083466 W JP2015083466 W JP 2015083466W WO 2016084953 A1 WO2016084953 A1 WO 2016084953A1
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- time slot
- logical path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0282—WDM tree architectures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0293—Optical channel protection
- H04J14/0295—Shared protection at the optical channel (1:1, n:m)
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/14—Monitoring arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1652—Optical Transport Network [OTN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J2011/0003—Combination with other multiplexing techniques
- H04J2011/0016—Combination with other multiplexing techniques with FDM/FDMA and TDM/TDMA
Definitions
- the present invention relates to a framer and a framing method. This application claims priority based on Japanese Patent Application No. 2014-241494 for which it applied on November 28, 2014, and uses the content here.
- OTN Optical Transport Network
- SDH Serial Digital Hierarchy
- Ethernet registered trademark
- the transmission capacity of one optical channel is wider than that of a conventional OTU.
- the framer used in OTUCn is set by multiplexing a plurality of client signals into one ODUCn (ODU: Optical Channel Data Unit).
- the framer generates an electrical signal of OTUCn (Optical channel Transport Unit-Cn) having a payload capacity of n ⁇ 100G from ODUCn in which the client signal is set.
- the framer interleaves the generated electrical signal of OTUCn to generate a parallel signal having a payload capacity of 100 G.
- n Optical channel Transport Lane-Cn.n
- the n parallel signals for one optical channel generated by the framer are multicarrier transmitted by optical subcarriers using each of a plurality of optical wavelengths. When a failure occurs in some of the plurality of optical wavelengths, there is a possibility that a high-priority client signal transmitted using the failed optical wavelength cannot be transmitted.
- a framer allocates a plurality of time slots of an optical channel to a plurality of logical paths each having a transmission priority, and a plurality of client signals received by the plurality of logical paths are assigned to the plurality of logical paths.
- a framer in a transmission apparatus that transmits a plurality of client signals by a plurality of optical subcarriers using a plurality of optical wavelengths that are allocated to the plurality of assigned time slots and that are associated with the plurality of time slots.
- the optical wavelength corresponding to the time slot assigned to the logical path having a high transmission priority is not used, the logical path having the high transmission priority is avoided by avoiding the time slot corresponding to the unused optical wavelength.
- a framer comprising a time slot allocation unit for changing the time slot assigned to the logical path having a transmission priority are.
- the time slot allocating unit is allocated to the logical path allocated to the time slot corresponding to the unused optical wavelength and to the time slot corresponding to the unused optical wavelength.
- the time slot assigning unit assigns the logical path assignment destination assigned to the time slot corresponding to the unused optical wavelength to a normal optical wavelength among the plurality of optical wavelengths. And, it may be changed to a time slot to which no logical path is assigned.
- the time slot allocation unit sets the logical path allocation destination allocated to the unused time slot corresponding to the unused optical wavelength to a normal optical wavelength among the plurality of optical wavelengths. Correspondingly, it may be changed to a time slot in which a logical path is not allocated and is not disabled.
- a framing method allocates a plurality of time slots of an optical channel to a plurality of logical paths each having a transmission priority, and transmits a plurality of client signals received by the plurality of logical paths to the plurality of logical paths. Performed by a framer in a transmission apparatus that transmits the plurality of client signals by a plurality of optical subcarriers using a plurality of optical wavelengths allocated to the plurality of time slots allocated to the plurality of time slots.
- the framing method when an optical wavelength corresponding to a time slot assigned to a logical path having a high transmission priority is not used, the high transmission priority is avoided by avoiding the time slot corresponding to the unused optical wavelength. At least one of the plurality of time slots in a logical path having By assigning a framing method having the time slot allocation step of changing the time slot assigned to the logical path having the higher transmission priority.
- the time slot assignment step is assigned to the logical path assigned to the time slot corresponding to the unused optical wavelength and to the time slot corresponding to the unused optical wavelength.
- the assigned time slot is exchanged with the logical path that has a lower transmission priority than the logical path and is assigned to a time slot corresponding to a normal optical wavelength among the plurality of optical wavelengths. You may have to perform reallocation of time slots.
- the logical path allocation destination allocated to the time slot corresponding to the unused optical wavelength corresponds to a normal optical wavelength among the plurality of optical wavelengths.
- the time slot may be changed to a time slot to which no logical path is assigned.
- the logical path allocation destination allocated to the time slot corresponding to the unused optical wavelength corresponds to a normal optical wavelength among the plurality of optical wavelengths.
- transmission according to the transmission priority can be performed even when some optical wavelengths are not used.
- FIG. 1 is a block diagram showing a configuration of an optical channel transmission system according to an embodiment of the present invention.
- FIG. 1 is a block diagram showing a configuration of an optical channel transmission system according to an embodiment of the present invention.
- FIG. 6 is a block diagram illustrating a transmission frame multiplexing processing control unit illustrated in FIG. 5. It is a figure which shows the structure of the time slot of the transmission frame in this embodiment. It is a figure which shows the table structure of the time slot allocation management table in this embodiment. It is a figure which shows the failure time slot list which the failure information receiving part shown in FIG. 6 receives. It is a figure which shows the structure of the failure logical path ID list
- FIG. 1 is a functional block diagram of an OTN framer 800 to which an embodiment of the present invention can be applied.
- the OTN framer 800 is an OTN (Optical Transport Network) standard OTUCn (Cn represents 100G ⁇ n, where n is an integer equal to or greater than 2) for transmission of more than 100G (B100G, G is gigabit per second).
- OTUCn OTN (Optical Transport Network) standard
- B100G G is gigabit per second
- OTN optical Network Data Unit
- GbE Gigabit Ethernet (registered trademark)
- G TS Triplebutary Slot
- the OTN framer 800 separates a signal of one optical channel of nx100G in which a plurality of client signals are multiplexed, and generates n 100G parallel signals.
- n parallel signals are multi-carrier transmitted by a plurality of optical subcarriers, but physically one parallel signal may be transmitted by one optical subcarrier, and a plurality of parallel signals are one It may be transmitted by an optical subcarrier.
- Multi-carrier transmission is a communication method for increasing the capacity of one channel by transmitting a signal of one channel in parallel using a plurality of subcarriers (carrier waves). In multicarrier transmission, subcarriers are densely multiplexed for each ground (connection destination) and electrically separated.
- the bandwidth of the optical subcarrier is 100G
- the bandwidth of the optical subcarrier is 200G
- Communication systems such as 4SC-DP-QPSK (4QSubcarrier-Dual Polarization-Quadrature Phase Shift Keying) and 2SC-DP-16QAM (2 Subcarrier-Dual Polarization-Quadrature Amplitude Modulation) are used.
- the OTN framer 800 includes a transmission processing unit 110 and a reception processing unit 150.
- the transmission processing unit 110 includes a client signal receiving unit 120, a multiprocessing unit 130, and a line side transmission processing unit 140.
- the client signal receiving unit 120 includes a receiving unit 121, a mapping unit 122, and an OH processing unit 123.
- the receiving unit 121 receives a client signal.
- the mapping unit 122 maps one client signal received by the receiving unit 121 to a payload of a LO ODU (Lower Order Optical Channel Data Unit) frame.
- the OH processing unit 123 adds OH (overhead) to the LO ODU frame in which the mapping unit 122 sets the client signal.
- the OH processing unit 123 outputs the electric path signal of the LO ODU frame to the ODU-switch (hereinafter referred to as “ODU-SW”) 210.
- the ODU-SW 210 is also connected to another OTN framer 800, and performs path exchange of electric path signals.
- the multiprocessing unit 130 includes a multiplexing unit 131 and a framing unit 132.
- the multiplexing unit 131 sets the electrical path signal received from the ODU-SW 210 in the LO ODU frame.
- the multiplexing unit 131 once maps the LO ODU frame to an ODTU (Optical Channel Data Tributary Unit) frame, and then time-multiplexes the plurality of ODTU frames to generate an ODUCn frame that is a HO ODU (Higher Order ODU).
- the framing unit 132 adds OH and FEC (Forward Error Correction) to the ODUCn frame generated by the multiplexing unit 131 to generate an OTUCn frame.
- the framing unit 132 outputs the signal of the OTUCn frame to the line side transmission processing unit 140.
- the interleaving unit 141 receives an OTUCn frame signal from the multiprocessing unit 130, byte-interleaves the received n ⁇ 100G OTUCn frame signal, and generates n OTLCn. An n-frame signal is generated. OTLCn.
- the n frame is a frame of a 100 G parallel signal. i-th OTLCn. n frames, OTLCn. n # i frame (where i is an integer from 1 to n).
- the interleaving unit 141 includes the generated n OTLCn. Each n # i frame is output to the OH processing unit 142-i.
- the OH processing units 142-1 to 142-n receive the OTLCn.
- the OH processing unit 142-i is an OTLCn.
- the n # i frame is output to the multilane transmission unit 143-i.
- the multilane transmission units 143-1 to 143-n receive the OTLCn.1 received from the OH processing units 142-1 to 142-n.
- the n-frame parallel signal is output to the transmitter 220.
- the multi-lane transmission unit 143-i uses four 28G electric wires in parallel to perform OTLCn.
- the parallel signal of the n # i frame is output to the transmitter 220.
- Each transmitter 220 uses optical subcarriers having different optical frequencies.
- the transmitter 220 converts the received parallel signal from an electrical signal to an optical signal and performs multicarrier transmission.
- a plurality of multilane transmission units 143-i may be connected to one transmitter 220.
- the transmitter 220 uses j ⁇ 100G optical subcarriers to make j parallel Transmit the signal.
- the reception processing unit 150 includes a line-side reception processing unit 160, a separation processing unit 170, and a client signal transmission unit 180.
- the line-side reception processing unit 160 includes multilane receiving units 161-1 to 161-n, OH processing units 162-1 to 162-n, and a deinterleaving unit 163.
- Multilane receivers 161-1 to 161-n receive electrical signals obtained by converting optical signals received by receiver 230 through multicarrier transmission.
- the receiver 230 receives an optical signal using optical subcarriers having different optical frequencies.
- the multilane receiving unit 161-i outputs, for example, the electrical signals received in parallel from the receiver 230 using four 28G electrical wirings to the OH processing unit 162-i.
- the OH processing units 162-1 to 162-n can receive the OTLCn.
- the head of the frame is recognized based on FAS (frame alignment signal) or MFAS (multiframe alignment signal) set in the OH of n frames.
- the OH processing unit 162-i detects the head position, compensates for the delay time difference, and detects the OTLCn.
- the n # i frame is extracted and output to the deinterleave unit 163.
- the deinterleaving unit 163 receives the OTLCn.1 received from the OH processing units 162-1 to 162-n.
- n # n frames are deinterleaved to generate one OTUCn frame.
- the separation processing unit 170 includes a deframing unit 171 and a demultiplexing unit 172.
- the deframing unit 171 performs FEC decoding on the signal of the OTUCn frame generated by the deinterleaving unit 163, extracts an ODUCn frame in which the LO ODU frame is time-multiplexed from the decoded OTUCn frame, and outputs the ODUCn frame to the demultiplexing unit 172.
- the demultiplexing unit 172 extracts the LO ODU frame in which each client signal is set from the ODUCn frame signal extracted by the deframing unit 171, and outputs the electric path signal of the LO ODU frame to the ODU-SW 210.
- the client signal transmission unit 180 includes an OH processing unit 181, a demapping unit 182, and a transmission unit 183.
- the OH processing unit 181 receives the electrical path signal from the ODU-SW 210, and decodes the LO ODU frame from the received electrical path signal.
- the OH processing unit 181 performs processing related to OH on the LO ODU frame and outputs it to the demapping unit 182.
- the demapping unit 182 receives the electrical path signal of the LO ODU frame from the OH processing unit 181, extracts a client signal from the received electrical path signal, and outputs the client signal to the transmission unit 183.
- the transmission unit 183 transmits the client signal extracted by the demapping unit 182.
- the client signal receiving unit 120 and the multiplex processing unit 130 may be directly connected without using the ODU-SW 210.
- the separation processing unit 170 and the client signal transmission unit 180 may be directly connected without going through the ODU-SW 210.
- FIG. 2 is a diagram illustrating a frame structure of OTUCn.
- OTUCn is generated by adding FACn OH, OTUCn OH, OPUCn OH, and OTUCn FEC to ODUCn.
- OTUCn is marked with 4 rows and 4080 ⁇ n columns.
- a client signal is mapped to the OPUCn payload (Payload) in the (16 ⁇ n + 1) to 3824 ⁇ n columns of OTUCn.
- OH is set in the 1st to 16 ⁇ n columns of the OTUCn frame.
- FACn OH is set in the 1st to 7 ⁇ n columns of the first row.
- the FACn OH includes information necessary for frame synchronization.
- OTUCn OH accommodating section monitoring information of the optical channel is inserted.
- ODUCn OH is inserted in the 1st to 14 ⁇ nth columns of the 2nd to 4th rows, and accommodates optical channel path management operation information.
- OPUCn OH is inserted, and information necessary for mapping / demapping of client signals is accommodated.
- a parity check byte for FEC is added to the OTUCn FECs in the 3824 ⁇ n + 1 to 4080 ⁇ n columns. Note that the FEC of this OTUCn frame may be omitted.
- the OTUCn FEC area is not limited to the area of the 3824 ⁇ n + 1 to 4080 ⁇ n columns, and may be changed to an area having an arbitrary number of bytes.
- FIG. 3 shows OTLCn. It is a figure which shows the frame structure of n. OTLCn. n is represented by 4 rows and 4080 columns. OTLCn. n # 1 to OTLC n. n # n is obtained by dividing the OTUCn frame by byte interleaving. The OTUCn payload of OTUCn is OTLCn. n # i, OPLCn. Maps to n # i payload. OTLCn. OH is set in the 1st to 16th columns of n # i. OTLCn. The OH of n # i is set based on OTUCn OH or the like. In the first to seventh columns of the first row, FALCn.
- n # i OH is set.
- FALCn The n # i OH includes information necessary for frame synchronization, such as FAS and MFAS.
- OTLCn. n # i OH is inserted.
- ODLCn. n # i OH is inserted to accommodate optical channel path management operation information.
- OPLCn. n # i OH is inserted, and information necessary for mapping / demapping of client signals is accommodated.
- a parity check byte for FEC is added to the n # i FEC. In addition, this OTLCn.
- the n-frame FEC may be omitted.
- the n # i FEC area is not limited to the area of the 3825th to 4080th columns, and may be changed to an area having an arbitrary number of bytes.
- FIG. 4A to 4D are diagrams showing optical channels used for transmission of optical signals.
- FIG. 4A is a diagram illustrating an optical channel when a 400 G optical signal is serially transmitted at one optical frequency (single carrier).
- FIG. 4B is a diagram illustrating an optical channel when a 400G optical signal is transmitted in parallel by four optical subcarriers (multicarrier transmission).
- a conventional electronic circuit it is difficult to continue to extend the band that can be serially transmitted with one optical frequency beyond 100 G, as shown in FIG. Therefore, in OTUCn, broadband transmission is realized without being restricted by electronic circuits by performing parallel transmission of a band exceeding 100 G using a plurality of optical subcarriers. For this parallel transmission, polarization multiplexing, multilevel modulation, or the like is used.
- the optical subcarrier band varies depending on the modulation method.
- FIG. 4B shows an example in which one 400G optical channel is transmitted in parallel by 100G four optical subcarriers.
- FIG. 4C shows an example in which one 400G optical channel is transmitted in parallel by two 200G optical subcarriers. Further, by changing n, as shown in FIG. 4D, the transmission band can be increased in units of 100G.
- FIG. 5 is a block diagram showing the configuration of the optical channel transmission system according to the present embodiment.
- the optical channel transmission system includes an optical transmission device 1 on the transmission side and an optical transmission device 2 on the reception side.
- the optical transmission device 1 includes a transmission unit 10.
- the optical transmission device 2 includes a receiving unit 20.
- the optical transmission device 1 includes only one transmission unit 10.
- the present embodiment is not limited to such a configuration.
- the optical transmission device 1 may include a plurality of transmission units 10 that use different optical channels.
- the optical transmission device 2 includes only one receiving unit 20, but the present embodiment is not limited to such a configuration.
- the optical transmission device 2 may include a plurality of reception units 20 corresponding to the same optical channels as the transmission unit 10.
- the transmission unit 10 includes a framer and a transmitter, and includes client signal reception units 11-1 to 11-4, a transmission frame multiplexing processing unit 12, a transmission frame transmission unit 13, a transmission frame transmission failure monitoring unit 14, and a transmission frame multiplexing process.
- a control unit 15 is provided.
- the receiving unit 20 includes a receiver and a framer, and includes a transmission frame receiving unit 21, a transmission frame demultiplexing processing unit 22, client signal transmission units 23-1 to 23-4, a transmission frame reception failure monitoring unit 24, and a transmission frame reverse unit.
- a multiprocessing control unit 25 is provided.
- the transmission unit 10 and the reception unit 20 are connected by a transmission path 3 that transmits an optical channel.
- Each of the client signal receiving units 11-1 to 11-4 has the same function as the client signal receiving unit 120 of FIG.
- the client signal receiving units 11-1 to 11-4 receive a client signal such as Ethernet (registered trademark) to generate logical path traffic, and transmit the logical path traffic to the transmission frame multiplexing processing unit 12.
- the logical path traffic is a client signal set in the LO ODU frame.
- the logical path traffic is generated from the client signal by, for example, sorting based on an Ethernet (registered trademark) VLAN (Virtual Local Area Network) tag.
- the client signal reception unit 11-1 receives a client signal # 1 of 100 Gbps (gigabit per second). Then, the client signal receiving unit 11-1 generates two 50 Gbps logical paths # 1 and # 2.
- Each logical path is given a transmission priority (hereinafter referred to as “priority”).
- the logical path # 1 is given priority: “high”
- the logical path # 2 is given priority: “low”.
- the client signal receiving unit 11-2 receives the client signal # 2 of 200 Gbps. Then, the client signal reception unit 11-2 generates a logical path # 3 of 200 Gbps. The logical path # 3 is given priority: “high”.
- the client signal receiving unit 11-3 receives the client signal # 3 of 100 Gbps. Then, the client signal receiving unit 11-3 generates a 100 Gbps logical path # 4. Also, the priority: “low” is assigned to the logical path # 4.
- the client signal receiving unit 11-4 receives a 100 Gbps client signal # 4. Then, the client signal receiving unit 11-4 generates a logical path # 5 of 100 Gbps. The logical path # 5 is given priority: “high”.
- the logical path #k is a logical path whose logical path ID is “#k”.
- the transmission frame multiplexing processing unit 12 has the same function as the multiplexing unit 131 of FIG.
- the transmission frame multiplexing processing unit 12 multiplexes a plurality of received logical path traffics to generate ODUCn that is a transmission frame constituting an optical channel.
- the transmission frame multiplex processing unit 12 transmits the generated transmission frame to the transmission frame transmission unit 13.
- the optical channel is divided into a plurality of time slots by time division multiplexing.
- Multiple logical path traffic is multiplexed by assigning each logical path traffic to a time slot.
- ITU-T International Telecommunication Union Telecommunication Standardization Sector
- This is an ODU multiplexing method using an ODTU frame defined in 709.
- the transmission frame transmission unit 13 has the same functions as the framing unit 132, the line side transmission processing unit 140, and the transmitter 220 in FIG.
- the transmission frame transmission unit 13 converts the received transmission frame into a transmission frame OTLCn. Divide into n # 1 to #n. Further, the transmission frame transmission unit 13 performs transmission frame OTLCn.1 for multicarrier transmission using a plurality of optical subcarriers.
- the parallel signals n # 1 to #n are transmitted to the transmission line 3 by using a plurality of optical wavelengths.
- the optical wavelength of the optical subcarrier used for optical transmission is determined in advance for each time slot. For optical wavelength # 1, transmission frame OTLCn. n # 1, transmission frame OTLCn. n # 2, transmission frame OTLCn. n # 3, transmission frame OTLCn. n # 4, transmission frame OTLCn.
- the n # 5 parallel signal is transmitted to the transmission line 3.
- the transmission frame reception unit 21 has the same functions as the receiver 230, the line side reception processing unit 160, and the deframing unit 171 in FIG.
- the transmission frame receiving unit 21 restores the transmission frame by performing an operation opposite to that of the transmission frame transmitting unit 13 and outputs the restored transmission frame to the transmission frame demultiplexing processing unit 22.
- the transmission frame demultiplexing processing unit 22 has the same function as the demultiplexing unit 172 of FIG.
- the transmission frame demultiplexing unit 22 outputs a client signal through the logical paths # 1 to # 5 by performing an operation opposite to that of the transmission frame multiplexing processing unit 12.
- the transmission frame demultiplexing processing unit 22 outputs the 50 Gbps logical path # 1 and the 50 Gbps logical path # 2 to the client signal transmission unit 23-1.
- the transmission frame demultiplexing unit 22 outputs the logical path # 3 of 200 Gbps to the client signal transmission unit 23-2.
- the transmission frame demultiplexing processing unit 22 outputs a logical path # 4 of 100 Gbps to the client signal transmission unit 23-3.
- the transmission frame demultiplexing unit 22 outputs the logical path # 5 of 100 Gbps to the client signal transmission unit 23-4.
- the client signal transmission units 23-1 to 23-4 have the same functions as the client signal transmission unit 180 of FIG.
- the client signal transmission unit 23-1 receives inputs of two 50 Gbps logical paths # 1 and # 2, and outputs a 100 Gbps client signal # 1 by an operation reverse to that of the client signal reception unit 11-1.
- the client signal transmission unit 23-2 receives the input of the logical path # 3 of 200 Gbps, and outputs the client signal # 2 of 200 Gbps by the operation reverse to that of the client signal reception unit 11-2.
- the client signal transmission unit 23-3 receives an input of the 100 Gbps logical path # 4, and outputs a 100 Gbps client signal # 3 by an operation reverse to that of the client signal reception unit 11-3.
- the client signal transmission unit 23-4 receives the input of the 100 Gbps logical path # 5, and outputs the client signal # 4 of 100 Gbps by the operation reverse to that of the client signal reception unit 11-4.
- the transmission frame reception failure monitoring unit 24 monitors a failure of the transmission frame reception unit 21 and notifies the transmission frame transmission failure monitoring unit 14 of failure information when it detects that a failure has occurred in the received optical wavelength. For example, when the transmission frame reception failure monitoring unit 24 cannot receive a signal having a specific optical wavelength, the transmission frame reception failure monitoring unit 24 detects that a failure has occurred in the optical wavelength. For example, when the transmission frame reception failure monitoring unit 24 detects that a failure has occurred in a physical port, the transmission frame reception failure monitoring unit 24 detects that a failure has occurred in the optical wavelength used for reception by the physical port.
- the failure information indicates a failure time slot that is a time slot affected by the failure of the optical wavelength.
- the transmission frame transmission failure monitoring unit 14 monitors the failure of the transmission frame transmission unit 13 and, when detecting that a failure has occurred in the transmitted optical wavelength, indicates a failure time slot that is affected by the failure of the optical wavelength. Information is notified to the transmission frame multiplexing processing control unit 15. For example, when the transmission frame transmission failure monitoring unit 14 detects that a failure has occurred in a physical port, the transmission frame transmission failure monitoring unit 14 detects that a failure has occurred in an optical wavelength used for transmission by the physical port. Further, when failure information is received from the transmission frame reception failure monitoring unit 24, the failure information is notified to the transmission frame multiplexing processing control unit 15.
- the transmission frame multiplexing processing control unit 15 detects that a failure has occurred in the optical wavelength in either the transmission frame transmission unit 13 or the transmission frame reception unit 21, the influence of the failure in the optical wavelength is affected. Information on the failure time slot to be received can be acquired.
- the transmission frame multiplexing processing control unit 15 instructs the transmission frame multiplexing processing unit 12 which logical path traffic is mapped to which time slot. Further, the transmission frame multiplex processing control unit 15 notifies the transmission frame demultiplexing processing control unit 25 of the information.
- the transmission frame multiplexing processing control unit 15 changes the mapping state of the logical path traffic to the time slot based on the failure information.
- the transmission frame multiplex processing control unit 15 instructs the transmission frame multiplex processing unit 12 of the contents of the change, and notifies the transmission frame demultiplexing processing control unit 25 of information indicating the contents of the change.
- the transmission frame demultiplexing control unit 25 notifies the transmission frame demultiplexing processing unit 22 which logical path traffic is mapped to which time slot based on the information received from the transmission frame multiplexing processing control unit 15. .
- FIG. 6 is a block diagram showing a detailed configuration of the transmission frame multiprocessing control unit 15 shown in FIG.
- the transmission frame multiplex processing control unit 15 includes a time slot allocation management table storage unit 51, a failure information reception unit 52, a list generation unit 53, a time slot allocation unit 54, and an allocation information transmission unit. 55.
- the time slot allocation management table storage unit 51 stores a time slot allocation management table for managing the allocation status of logical paths to time slots.
- the failure information receiving unit 52 receives failure information transmitted from the transmission frame transmission failure monitoring unit 14 or the transmission frame reception failure monitoring unit 24.
- the list generation unit 53 generates list information necessary for assigning to the time slot from the collected information.
- the time slot allocation unit 54 refers to the list information generated by the list generation unit 53, and allocates time slots by changing the mapping state to the time slots. Further, the time slot allocation unit 54 updates the time slot allocation management table stored in the time slot allocation management table storage unit 51 based on the result of the allocation.
- the allocation information transmission unit 55 transmits information on the mapping state to the time slot to the transmission frame multiplexing processing unit 12 and the transmission frame demultiplexing processing control unit 25.
- FIG. 7 is a diagram illustrating a configuration of a time slot of a transmission frame.
- 100 Gbps is represented by 10 time slots for simplicity.
- a minimum rectangle shown in FIG. 7 indicates a time slot.
- Each time slot is assigned a time slot ID of 1 to 50.
- Time slots with time slot IDs 1 to 10 are assigned to the optical wavelength # 1.
- time slots with time slot IDs 11 to 20 are assigned to the optical wavelength # 2.
- time slots with time slot IDs 21 to 30 are assigned to the optical wavelength # 3.
- time slots with time slot IDs 31 to 40 are assigned to the optical wavelength # 4.
- time slots with time slot IDs 41 to 50 are assigned to the optical wavelength # 5.
- the client signal mapped to the time slot assigned to the optical wavelength #i is transmitted from the transmission frame OTLCn.
- n # i parallel signals are transmitted by optical subcarriers of optical wavelength #i.
- the time slot shown in FIG. 7 shows an example in which the number of slots is 50, but the number of slots is not limited to this. The number of time slots may exceed 50.
- the division into time slots is performed for each optical channel.
- FIG. 8 shows a table structure of the time slot allocation management table.
- the time slot allocation management table is data including records in which fields of “logical path ID”, “priority”, “transmission band”, and “allocation time slot ID” are associated.
- the logical path ID is stored in the “logical path ID” field.
- the priority of the associated logical path is stored. As the priority, either “high” indicating that the priority is high or “low” indicating that the priority is low is stored.
- the value of the transmission band of the associated logical path is stored.
- the ID of the time slot to which the associated logical path is assigned (ID 1 to 50 in this example) is stored.
- the logical path is allocated to the number of time slots according to the bandwidth of the logical path by the time slot allocation unit 54.
- the “assigned time slot ID” field does not store the ID of a time slot that has not been assigned.
- FIG. 9 is a diagram showing a configuration of a failure time slot list received by the failure information receiving unit 52 shown in FIG.
- the failure time slot list is an example of failure information transmitted from the transmission frame transmission failure monitoring unit 14 or the transmission frame reception failure monitoring unit 24, and is a time slot of a failure time slot that is a time slot affected by an optical wavelength failure.
- This is list information describing IDs.
- the time slot IDs 21, 22, 23, 24, 25, 26, 27, 28, 29, and 30 have faults.
- the faulty time slot is a time slot corresponding to the optical wavelength in which the fault has occurred.
- the light wavelength at which the failure has occurred is an example of a light wavelength that is not used.
- FIG. 10 is a diagram illustrating a configuration of a failure logical path ID list generated by the list generation unit 53 illustrated in FIG.
- the failure logical path ID list is generated by the list generation unit 53 with reference to the time slot allocation management table and the failure time slot list.
- the list generation unit 53 specifies the ID of the logical path to which the fault time slot is assigned, and generates the fault logical path ID list by describing the ID of the specified logical path.
- the example illustrated in FIG. 10 indicates that there is a failure in the logical path whose logical path ID is # 3.
- a logical path with a failure is also referred to as a failed logical path.
- FIG. 11 is a diagram showing a configuration of an unallocated normal time slot ID list generated by the list generation unit 53 shown in FIG.
- the unallocated normal time slot ID list is generated by the list generation unit 53 with reference to the time slot allocation management table and the failure time slot list.
- the unassigned normal time slot ID list describes time slot IDs of unassigned normal time slots that are time slots (empty time slots) to which no logical path is assigned among time slots not included in the failed time slot list. List information.
- the example shown in FIG. 11 indicates that the unallocated normal time slot is not the current time. If there is an unassigned normal time slot, the ID of the time slot is described in this list.
- FIG. 12 is a diagram showing a configuration of a normal logical path ID list generated by the list generation unit 53 shown in FIG.
- the normal logical path ID list is generated by the list generation unit 53 with reference to the time slot allocation management table and the failure time slot list.
- the normal logical path ID list is list information describing IDs of logical paths (normal logical paths) that are not assigned to the time slots included in the failed time slot list.
- the example shown in FIG. 12 indicates that the logical paths with logical path IDs # 1, # 2, # 4, and # 5 are normal.
- FIG. 13 is a flowchart showing the processing operation of the transmission frame multiple processing control unit 15 shown in FIG.
- the failure information receiving unit 52 receives a failure time slot list from the transmission frame transmission failure monitoring unit 14 or the transmission frame reception failure monitoring unit 24 (step S1).
- the failure information reception unit 52 outputs the received failure time slot list to the list generation unit 53.
- the list generation unit 53 generates a failure logical path ID list (see FIG. 10), which is a list of failure logical paths to which time slots included in the failure time slot list (see FIG. 9) are assigned (Step 10). S2).
- the list generation unit 53 identifies the record in which the ID of the failed time slot described in the failed time slot list is set in the assigned time slot ID of the time slot allocation management table (see FIG. 8), and the identified record Is read out.
- the list generation unit 53 specifies the ID of the logical path that includes the failure time slot as the assignment destination, and generates the failure logical path ID list by describing the ID of the specified logical path.
- the list generation unit 53 includes an unassigned normal time slot ID list (see FIG. 11), which is a list of empty time slots to which no logical path is assigned among normal time slots not included in the failed time slot list. ) Is generated (step S3).
- the list generation unit 53 removes, from the IDs of all time slots, the IDs of the time slots set in the failed time slot list and the IDs of the time slots set in the assigned time slot ID of the time slot assignment management table. To obtain the ID of an unallocated normal time slot.
- the list generation unit 53 generates an unassigned normal time slot ID list in which the IDs of the obtained unassigned normal time slots are set.
- the list generation unit 53 determines the time slot ID set in the failed time slot list and the time slot ID set in the assigned time slot ID of the time slot assignment management table from the IDs of all time slots. And the IDs of unassigned normal time slots except for the IDs of time slots set to unusable.
- the list generation unit 53 generates an unassigned normal time slot ID list in which the IDs of the obtained unassigned normal time slots are set.
- the time slot set to unusable is a time slot included in an unusable area.
- the time slot set to unusable is, for example, a time slot whose availability is set to unusable.
- the list generation unit 53 generates a normal logical path ID list (see FIG. 12), which is a list of normal logical path IDs not assigned to the failed time slots included in the failed time slot list (step S4). .
- the list generation unit 53 identifies, among the records in the time slot allocation management table, a record that does not include the time slot ID set in the failed time slot list in the allocated time slot ID.
- the list generation unit 53 reads the logical path ID from the record of the identified time slot allocation management table, and generates a normal logical path ID list in which the read logical path ID is set.
- the list generation unit 53 outputs each generated list to the time slot allocation unit 54.
- the time slot allocation unit 54 refers to the information in the time slot allocation management table and each list, and reallocates time slots (step S5).
- the time slot allocation unit 54 performs either of the following first or second reallocation processes to perform time slot reassignment, and manages the time slot allocation stored in the time slot allocation management table storage unit 51. Update the table.
- the allocation information transmission unit 55 transmits the information on the time slot reassignment result to the transmission frame multiplexing processing unit 12 and the transmission frame demultiplexing control unit 25.
- the first reallocation process When the normal logical path having a lower priority than the failed logical path included in the failed logical path ID list is included in the normal logical path ID list, the first reallocation process The time slot is reassigned so that the time slot is replaced with the time slot that is the assignment destination of the failed logical path to which the currently failed time slot is assigned. That is, the time slot allocation unit 54 identifies a record in the time slot allocation management table based on the failure logical path ID set in the failure logical path ID list, and reads the priority of the failure logical path from the identified record.
- the time slot allocation unit 54 identifies a record in the time slot allocation management table based on the normal logical path ID set in the normal logical path ID list, and reads the priority of the normal logical path from the identified record. The time slot allocation unit 54 compares these read priorities, and determines whether or not the normal logical path having a lower priority than the failed logical path is included in the normal logical path ID list. When there is a normal logical path having a lower priority than the failed logical path, the time slot allocating unit 54 assigns a time slot to which the lower priority normal logical path is assigned and a time slot to which the failed logical path is assigned. Reassign time slots to replace them.
- the allocation destination of the lower priority normal logical path is determined.
- Time slot reassignment so that the time slot, the time slot to which the failed logical path is assigned, and the unassigned normal time slot whose ID is set in the unassigned normal time slot ID list are interchanged I do. That is, as in the first reassignment process, the time slot allocation unit 54 sets the priority of the failed logical path whose ID is set in the failed logical path ID list and the ID set in the normal logical path ID list.
- the priorities of normal logical paths are read from the time slot allocation management table and compared.
- the time slot allocating unit 54 assigns the time slot to which the failed logical path is assigned to an unassigned normal time slot ID list whose ID is set. Change to normal time slot. If there is no failed time slot from the time slot to which the failed logical path is assigned due to this change, the reassignment is terminated. If all of the failed time slots to which the failed logical path is assigned cannot be changed to unassigned normal time slots even if the assigned time slot is changed, the same reassignment as in the first reassignment process is performed. Process. That is, the time slot allocating unit 54 replaces the failed time slot that cannot be changed to the unallocated normal time slot among the failed logical path allocation destinations and the time slot that is assigned the lower priority normal event logical path. Reassign time slots.
- the transmission frame multiplexing processing unit 12 sets the client signal received through each logical path in the time slot of ODUCn according to the information on the time slot reassignment result received from the transmission frame multiplexing processing control unit 15.
- the transmission frame demultiplexing processing control unit 25 rewrites the time slot allocation management table used by the receiving unit 20 based on the information on the time slot reassignment result received from the transmission frame multiplexing processing control unit 15 to re-configure the time slot.
- Information on the allocation result is output to the transmission frame demultiplexing processing unit 22.
- the transmission frame demultiplexing processing unit 22 extracts the client signal of each logical path from ODUCn according to the information received from the transmission frame demultiplexing control unit 25.
- FIG. 14 is a diagram showing a mapping process of logical path traffic to time slots.
- the time slot allocation unit 54 performs time slot allocation processing for the 500 Gbps optical channel # 1 by, for example, packing logical paths # 1 to # 5 in order from the smallest number of the time slot.
- the time slot allocation unit 54 generates a time slot allocation management table in the initial state shown in the upper left diagram of FIG. 14 and registers it in the time slot allocation management table storage unit.
- the diagram shown in the lower left of FIG. 14 shows the time slot allocation of the logical paths # 1 to # 5 in the initial state.
- Each time slot is specified by an ID of 1 to 50.
- the failure information receiving unit 52 of the transmission frame multiplexing processing control unit 15 acquires the failure time slot list ⁇ 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 ⁇ (see FIG. 9) (step 9). S1).
- the list generation unit 53 specifies a record in which the ID of the failed time slot described in the failed time slot list is set in the assigned time slot ID of the time slot allocation management table.
- the list generation unit 53 generates a failed logical path ID list ⁇ # 3 ⁇ (see FIG. 10) in which the logical path ID read from the identified record is set (step S2).
- the list generation unit 53 uses the time slots IDs 21 to 30 set in the failed time slot list from the IDs 1 to 50 of all the time slots and the time slot IDs set in the assigned time slot ID of the time slot assignment management table. Except IDs 1 to 5, 6 to 10, 11 to 30, 31 to 40, and 41 to 50, IDs of unassigned normal time slots are specified.
- the list generation unit 53 since there is no unallocated normal time slot, the list generation unit 53 generates an unallocated normal time slot ID list ⁇ null ⁇ (see FIG. 11) (step S3).
- the list generation unit 53 identifies, among the records in the time slot allocation management table, records that do not include the fault time slot IDs 21 to 30 set in the fault time slot list in the allocation time slot ID.
- the list generation unit 53 generates a normal logical path ID list ⁇ # 1, # 2, # 4, # 5 ⁇ (see FIG. 12) in which the ID of the logical path read from the identified record is set (step S4).
- the time slot allocating unit 54 determines the priority of the logical path # 3 set in the failed logical path ID list and the logical paths # 1, # 2, # 4, and # 5 set in the normal logical path ID list. Is read from the time slot allocation management table. The priority “low” of the logical paths # 2 and # 4 is lower than the priority “high” of the logical path # 3, and there is no unassigned normal time slot. For this reason, the time slot allocation unit 54 replaces the allocation time slot between the logical path # 3 and the logical paths # 2 and # 4.
- the time slots of IDs 21 to 30 set in the failure time slot list among the time slots of IDs 11 to 30 assigned to the logical path # 3 set in the failure logical path ID list and the logical path # 4 The time slots with IDs 21 to 30 which are the allocation destinations are replaced (step S5).
- a logical path for time slot replacement may be selected so that the number of logical paths affected by the failure is minimized.
- the transmission frame multiplexing processing control unit 15 replaces the allocation time slot so as to map the logical path traffic with the priority “low” to the failure time slot, and as shown in the upper right diagram of FIG. Change the time slot allocation management table.
- the figure shown in the lower right of FIG. 14 shows a transmission frame after time slot reassignment.
- the transmission frame multiplexing processing control unit 15 performs reassignment so that a logical path with a lower priority is assigned to a time slot affected by a failure.
- FIG. 15 is a diagram illustrating a process of mapping logical path traffic to a time slot.
- the time slot allocation unit 54 performs time slot allocation processing such as packing the logical paths # 1 to # 5 in ascending order of time slots for the 500 Gbps optical channel # 1.
- the time slot allocation unit 54 generates a time slot allocation management table in the initial state shown in the upper left diagram of FIG. 15 and registers it in the time slot allocation management table storage unit.
- the diagram shown in the lower left of FIG. 15 shows time slot allocation of logical paths # 1 to # 5 in the initial state. Each time slot is specified by an ID of 1 to 50.
- the failure information receiving unit 52 of the transmission frame multiplex processing control unit 15 acquires the failure time slot list ⁇ 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 ⁇ (step S1).
- the list generation unit 53 specifies a record in which the ID of the failed time slot described in the failed time slot list is set in the assigned time slot ID of the time slot allocation management table.
- the list generation unit 53 generates a failed logical path ID list ⁇ # 3 ⁇ in which the logical path ID read from the identified record is set (step S2).
- the list generation unit 53 uses the time slots IDs 21 to 30 set in the failed time slot list from the IDs 1 to 50 of all the time slots and the time slot IDs set in the assigned time slot ID of the time slot assignment management table. Except IDs 1, 2, 11 to 30, 31 to 40, and 41 to 45, IDs of unassigned normal time slots are specified.
- the list generation unit 53 generates an unassigned normal time slot ID list ⁇ 3, 4,..., 10, 46,..., 50 ⁇ in which the identified unassigned normal time slot IDs are set (step S3).
- the list generation unit 53 identifies, among the records in the time slot allocation management table, records that do not include the fault time slot IDs 21 to 30 set in the fault time slot list in the allocation time slot ID.
- the list generation unit 53 generates a normal logical path ID list ⁇ # 1, # 2, # 4, # 5 ⁇ in which the logical path ID read from the identified record is set (step S4).
- the time slot allocating unit 54 determines the priority of the logical path # 3 set in the failed logical path ID list and the logical paths # 1, # 2, # 4, and # 5 set in the normal logical path ID list. Is read from the time slot allocation management table. The priority “low” of the logical paths # 2 and # 4 is lower than the priority “high” of the logical path # 3, and the unassigned normal time slot ID list is not null. Therefore, the time slot allocating unit 54 sets the time slots with IDs 21 to 30 set in the failed time slot list among the time slots with IDs 11 to 30 to which the logical path # 3 is set in the failed logical path ID list.
- the transmission frame multiplex processing control unit 15 switches the mapping so as not to map the logical path traffic to the failed time slot, and changes the time slot allocation management table as shown in the diagram shown in the upper right of FIG. .
- the figure shown in the lower right of FIG. 15 shows a transmission frame after time slot reassignment.
- the transmission frame multiplexing processing control unit 15 uses the empty slot and performs reassignment so that traffic is not interrupted as much as possible.
- FIG. 16 is a diagram showing a mapping process of logical path traffic to time slots.
- the time slot allocation unit 54 performs time slot allocation processing such as packing the logical paths # 1 to # 5 in ascending order of time slots for the 500 Gbps optical channel # 1.
- the time slot allocation unit 54 generates a time slot allocation management table in the initial state shown in the upper left diagram of FIG. 16 and registers it in the time slot allocation management table storage unit.
- the diagram shown in the lower left of FIG. 16 shows time slot allocation of logical paths # 1 to # 5 in the initial state. Each time slot is specified by an ID of 1 to 50.
- the failure information receiving unit 52 of the transmission frame multiplex processing control unit 15 acquires the failure time slot list ⁇ 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 ⁇ (step S1).
- the list generation unit 53 specifies a record in which the ID of the failed time slot described in the failed time slot list is set in the assigned time slot ID of the time slot allocation management table.
- the list generation unit 53 generates a failed logical path ID list ⁇ # 3 ⁇ in which the logical path ID read from the identified record is set (step S2).
- the list generation unit 53 uses the time slots IDs 21 to 30 set in the failed time slot list from the IDs 1 to 50 of all the time slots and the time slot IDs set in the assigned time slot ID of the time slot assignment management table. IDs 1, 2, 11 to 18, 21 to 28, 31 to 38, 41 to 46, and IDs 9, 10, 19, 20, 29, 30, 39, 40, 49, and 50 of time slots set to unusable IDs of unassigned normal time slots are specified.
- the list generation unit 53 generates an unallocated normal time slot ID list ⁇ 3,..., 8, 47, 48 ⁇ in which the identified unallocated normal time slot IDs are set (step S3).
- the list generation unit 53 identifies, among the records in the time slot allocation management table, records that do not include the fault time slot IDs 21 to 30 set in the fault time slot list in the allocation time slot ID.
- the list generation unit 53 generates a normal logical path ID list ⁇ # 1, # 2, # 4, # 5 ⁇ in which the logical path ID read from the identified record is set (step S4).
- the time slot allocating unit 54 determines the priority of the logical path # 3 set in the failed logical path ID list and the logical paths # 1, # 2, # 4, and # 5 set in the normal logical path ID list. Is read from the time slot allocation management table. The priority “low” of the logical paths # 2 and # 4 is lower than the priority “high” of the logical path # 3, and the unassigned normal time slot ID list is not null. Therefore, the time slot assignment unit 54 is set in the failure time slot list among the time slots of the assignment destination IDs 11 to 18, 21 to 28, 31 to 34 of the logical path # 3 set in the failure logical path ID list.
- the time slots with IDs 21 to 28 are changed to time slots with IDs 3 to 8, 47, and 48 included in the unallocated normal time slot ID list (step S5).
- the transmission frame multiplex processing control unit 15 changes the mapping so as not to map the logical path traffic to the failed time slot, and changes the time slot allocation management table as shown in the upper right diagram of FIG. .
- the figure shown in the lower right of FIG. 16 shows a transmission frame after time slot reassignment.
- the transmission frame multiplexing processing control unit 15 uses the empty slot and performs reassignment so that traffic is not interrupted as much as possible.
- the priority may be a multi-value setting represented by values “0” to “7”.
- the time slot allocating unit 54 assigns the time slot to which the lower priority normal logical path is assigned and the failed logical path. The time slot is reassigned so as to replace the assigned time slot.
- the time slot allocating unit 54 determines the normal logical path for exchanging the failed logical path and the assigned time slot based on the priority. You may choose. For example, the time slot allocation unit 54 may preferentially select a normal logical path for exchanging a failed logical path and an assigned time slot from the path with the lowest priority.
- the transmission frame multiplexing processing control unit 15 performs the reallocation processing when an optical wavelength failure occurs, but the embodiment of the present invention is not limited to such a case. Reassignment processing corresponding to the failure patterns of all light wavelengths may be performed in advance. When a failure actually occurs in the optical wavelength, the transmission frame multiplex processing control unit 15 transmits information on allocation to the time slot of each logical path calculated for the failure pattern corresponding to the failure that occurred. The data is transmitted to the frame multiplexing processing unit 12 and the transmission frame inverse multiplexing processing control unit 25.
- the framer on the transmission side constituting the optical channel transmission system allocates a logical path with a transmission priority to each time slot of the optical channel according to the band of the logical path.
- Each time slot corresponds to one of the optical wavelengths of a plurality of optical subcarriers used for multicarrier transmission.
- the framer on the transmission side divides the client signal received by the logical path into time slots assigned to the logical path, and the client signal is divided into a plurality of optical subcarriers using optical wavelengths corresponding to the time slots. Transmit to the framer.
- the transmission-side framer detects a time slot that affects the failure, and generates a failure time slot list that is a list of detected time slots.
- the framer on the transmission side generates a failed logical path ID list that is a list of logical paths to which time slots included in the failed time slot list are assigned. Further, the framer on the transmission side generates an unassigned normal time slot ID list that is a list of time slots to which no logical path is assigned among time slots not included in the failed time slot list. The framer on the transmission side generates a normal logical path ID list that is a list of logical path IDs that are not assigned to the time slots included in the failed time slot list. Furthermore, the framer on the transmission side executes one of the following processes (1) and (2).
- Process (2) When a logical path with a lower transmission priority than a logical path included in the failed logical path ID list is included in the normal logical path ID list, a time slot to which a logical path with a lower transmission priority is assigned; The time slot is reassigned so as to be switched between the time slot to which the logical path assigned to the failed time slot is assigned and the time slot included in the unassigned normal time slot ID list.
- the optical channel is configured so that the time slot is assigned to the logical path with high priority while avoiding the time slot corresponding to the optical wavelength in which the failure has occurred. It is possible to dynamically change the assignment of the logical path to each time slot and perform transmission according to the transmission priority of the logical path.
- an optical channel is divided into a plurality of time slots, and a logical path with a transmission priority is assigned to each time slot according to the bandwidth of the logical path.
- a logical path with a transmission priority is assigned to each time slot according to the bandwidth of the logical path.
- the framer in the optical transmission apparatus can change the mapping of the logical path if there is a vacant band in the optical channel at the time of failure of some optical wavelengths or physical ports that transmit the optical channel. Restore logical path traffic. Further, when there is no free bandwidth in the optical channel, transmission according to the transmission priority of the logical path can be performed.
- the transmission frame transmission failure monitoring unit 14, the transmission frame multiplexing processing control unit 15, the transmission frame reception failure monitoring unit 24, and the transmission frame inverse multiplexing processing control unit 25 in the above-described embodiment may be realized by a computer.
- a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed.
- the “computer system” here includes hardware such as an OS (operating system) and peripheral devices.
- the “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, and a hard disk incorporated in a computer system.
- the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line.
- a volatile memory inside a computer system serving as a server or a client in that case may be included and a program held for a certain period of time.
- the program may be for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in the computer system. It may be realized using hardware such as PLD (Programmable Logic Device) or FPGA (Field Programmable Gate Array).
- the present invention can be used for large-capacity optical transmission.
- Optical transmission apparatus 2 Optical transmission apparatus 3 Transmission path 10 Transmission part 20 Reception part 11-1 to 11-4 Client signal reception part 12 Transmission frame multiplexing process part 13 Transmission frame transmission part 14 Transmission frame transmission failure monitoring part 15 Transmission frame multiplexing Processing control unit 21 Transmission frame receiving unit 22 Transmission frame demultiplexing unit 23-1 to 23-4 Client signal transmitting unit 24 Transmission frame reception failure monitoring unit 25 Transmission frame demultiplexing control unit 51 Time slot allocation management table storage unit 52 Fault information reception unit 53 List generation unit 54 Time slot allocation unit 55 Assignment information transmission unit 110 Transmission processing unit 120 Client signal reception unit 121 Reception unit 122 Mapping unit 123 OH processing unit 130 Multiplexing unit 131 Multiplexing unit 132 Framing unit 140 Line Side transmission processor 1 1 Interleaving section 142-1, 142-2, 142-3, 142-4 OH processing section 143-1, 143-2, 143-3, 143-4 Multilane transmission section 150 Reception processing section 160 Line side reception processing section 161-1, 161-2, 161-3, 161-4 Multilane receivers 162-1,
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Abstract
Description
本願は、2014年11月28日に出願された特願2014-241494号に基づき優先権を主張し、その内容をここに援用する。
上述したフレーマにおいて、前記タイムスロット割り当て部は、前記使用しない光波長に対応した前記使用しないタイムスロットに割り当てられている前記論理パスの割り当て先を、前記複数の光波長のうち正常な光波長に対応し、論理パスが割り当てられておらず、かつ使用不可に設定されていないタイムスロットに変更してもよい。
上述したフレーミング方法において、前記タイムスロット割り当てステップは、前記使用しない光波長に対応した前記タイムスロットに割り当てられている前記論理パスの割り当て先を、前記複数の光波長のうち正常な光波長に対応し、論理パスが割り当てられておらず、かつ、使用不可に設定されていないタイムスロットに変更することを有していてもよい。
図1は、本発明の実施形態を適用可能なOTNフレーマ800の機能ブロック図である。OTNフレーマ800は、100G超(B100G、Gはギガビット毎秒)の伝送を行うためのOTN(Optical Transport Network)の規格であるOTUCn(Cnは100G×nを表す。nは2以上の整数。)により通信を行う。図1においては、n=4の場合、すなわち、OTNフレーマ800がOTUC4により通信を行う場合の例を示している。
送信処理部110は、クライアント信号受信部120と、多重処理部130と、ライン側送信処理部140とを備える。
受信部121は、クライアント信号を受信する。マッピング部122は、受信部121が受信した1クライアント信号をLO ODU(Lower Order Optical Channel Data Unit)フレームのペイロードにマッピングする。OH処理部123は、マッピング部122がクライアント信号を設定したLO ODUフレームにOH(オーバーヘッド)を付加する。OH処理部123は、LO ODUフレームの電気パス信号を、ODU-スイッチ(以下、「ODU-SW」と記載)210に出力する。ODU-SW210は、他のOTNフレーマ800とも接続されており、電気パス信号のパス交換を行う。
インタリーブ部141は、多重処理部130からOTUCnフレームの信号を受信し、受信したn×100GのOTUCnフレームの信号をバイトインタリーブして、n個のOTLCn.nフレームの信号を生成する。OTLCn.nフレームは、100Gのパラレル信号のフレームである。i個目のOTLCn.nフレームを、OTLCn.n#iフレーム(iは1以上n以下の整数)と記載する。インタリーブ部141は、生成したn個のOTLCn.n#iフレームをそれぞれOH処理部142-iに出力する。
マルチレーン送信部143-1~143-nは、OH処理部142-1~142-nから受信したOTLCn.nフレームのパラレル信号を送信機220に出力する。例えば、マルチレーン送信部143-iは、4本の28Gの電気配線を使用してパラレルにOTLCn.n#iフレームのパラレル信号を送信機220に出力する。各送信機220は、それぞれ異なる光周波数の光サブキャリアを使用する。送信機220は、受信したパラレル信号を電気信号から光信号に変換し、マルチキャリア伝送する。なお、複数のマルチレーン送信部143-iが1つの送信機220に接続されてもよい。j個(jは2以上n以下の整数)のマルチレーン送信部143-iが1つの送信機220に接続される場合、その送信機220は、j×100Gの光サブキャリアによりj個のパラレル信号を伝送する。
マルチレーン受信部161-1~161-nは、受信機230がマルチキャリア伝送により受信した光信号を変換することにより得らえた電気信号を受信する。受信機230は、それぞれ異なる光周波数の光サブキャリアにより光信号を受信する。マルチレーン受信部161-iは、例えば4本の28Gの電気配線を使用して受信機230からパラレルに受信した電気信号を、OH処理部162-iに出力する。
デインタリーブ部163は、OH処理部162-1~162-nから受信したOTLCn.n#1フレーム~OTLCn.n#nフレームをデインタリーブし、1つのOTUCnフレームを生成する。
デフレーミング部171は、デインタリーブ部163が生成したOTUCnフレームの信号をFEC復号し、復号したOTUCnフレームからLO ODUフレームが時間多重されたODUCnフレームを抽出して逆多重化部172に出力する。
逆多重化部172は、デフレーミング部171が抽出したODUCnフレームの信号から各クライアント信号が設定されたLO ODUフレームを抽出し、LO ODUフレームの電気パス信号をODU-SW210に出力する。
OH処理部181は、ODU-SW210から電気パス信号を受信し、受信した電気パス信号からLO ODUフレームを復号する。OH処理部181は、LO ODUフレームに対してOHに関する処理を行い、デマッピング部182に出力する。
デマッピング部182は、OH処理部181からLO ODUフレームの電気パス信号を受信し、受信した電気パス信号からクライアント信号を抽出して送信部183に出力する。
送信部183は、デマッピング部182が抽出したクライアント信号を送信する。
OTUCnは、ODUCnに、FACn OH、OTUCn OH、OPUCn OH、及び、OTUCnFECを付加して生成される。OTUCnは、4行、4080×n列で標記される。
OTUCnの(16×n+1)~3824×n列目のOPUCnペイロード(Payload)には、クライアント信号がマッピングされる。OTUCnフレームの1~16×n列目には、OHが設定される。1行目の1~7×n列目には、FACn OHが設定される。FACn OHは、フレーム同期に必要な情報を含む。
(7×n+1)~14×n列目には光チャネルのセクション監視情報を収容するOTUCn OHが挿入される。2~4行目の1~14×n列目には、ODUCn OHが挿入され、光チャネルのパス管理運用情報を収容する。(14×n+1)~16×n列目には、OPUCn OHが挿入され、クライアント信号のマッピング/デマッピングに必要な情報などが収容される。3824×n+1~4080×n列目のOTUCn FECには、FEC用のパリティチェックバイトが付加される。なお、このOTUCnフレームのFECは、省略しても良い。また、OTUCn FEC領域は、3824×n+1~4080×n列目の領域に限らず、任意のバイト数からなる領域に変更しても良い。
OTLCn.nは、4行、4080列で標記される。OTLCn.n#1~OTLCn.n#nは、バイトインタリーブによりOTUCnフレームを分割して得られる。
OTUCnのOPUCnペイロードは、OTLCn.n#iの17~3824列目のOPLCn.n#iペイロードにマッピングされる。
OTLCn.n#iの1~16列目には、OHが設定される。OTLCn.n#iのOHは、OTUCn OH等に基づいて設定される。1行目の1~7列目には、FALCn.n#i OHが設定される。FALCn.n#i OHは、FASやMFASなど、フレーム同期に必要な情報を含む。1行目の8~14列目には、光チャネルのセクション監視情報を収容するOTLCn.n#i OHが挿入される。2~4行目の1~14列目には、ODLCn.n#i OHが挿入され、光チャネルのパス管理運用情報を収容する。15~16列目には、OPLCn.n#i OHが挿入され、クライアント信号のマッピング/デマッピングに必要な情報などが収容される。3825~4080列目のOTLCn.n#i FECには、FEC用のパリティチェックバイトが付加される。なお、このOTLCn.nフレームのFECは、省略しても良い。また、OTLCn.n#i FEC領域は、3825~4080列目の領域に限らず、任意のバイト数からなる領域に変更しても良い。
図4Aは、400Gの光信号を1光周波数(シングルキャリア)によりシリアル伝送する場合の光チャネルを示す図である。図4Bは、400Gの光信号を4つの光サブキャリアによりパラレル伝送(マルチキャリア伝送)する場合の光チャネルを示す図である。
従来の電子回路では、動作速度の制約から、図4Aに示すように、1光周波数によりシリアル伝送することができる帯域を、100Gを超えて拡張し続けていくことは困難である。そこでOTUCnでは、100G超の帯域を複数の光サブキャリアによりパラレル伝送することにより、電子回路の制約を受けずに広帯域伝送を実現する。このパラレル伝送には、偏波多重、多値変調などが用いられる。変調方式によって、光サブキャリアの帯域は異なる。
図4Bは、400Gの1光チャネルを、100Gの4光サブキャリアによりパラレル伝送した場合の例である。図4Cは、400Gの1光チャネルを、200Gの2光サブキャリアによりパラレル伝送した場合の例である。また、nを変化させることにより、図4Dに示すように、100G単位で伝送帯域を増加させていくことができるフレキシビリティを有する。
例えば、伝送フレーム受信障害監視部24は、特定の光波長の信号が受信できない場合、その光波長に障害が発生したことを検出する。また、例えば、伝送フレーム受信障害監視部24は、物理ポートに障害が発生したことを検出した場合、その物理ポートが受信に使用する光波長に障害が発生したことを検出する。障害情報は、光波長の障害の影響を受けるタイムスロットである障害タイムスロットを示す。
図7に示す最小の矩形がタイムスロットを示す。各タイムスロットには、1~50のタイムスロットIDが付与されている。そして、タイムスロットIDが1~10のタイムスロットが光波長#1に割り当てられている。同様に、タイムスロットIDが11~20のタイムスロットが光波長#2に割り当てられている。また、タイムスロットIDが21~30のタイムスロットが光波長#3に割り当てられている。また、タイムスロットIDが31~40のタイムスロットが光波長#4に割り当てられている。また、タイムスロットIDが41~50のタイムスロットが光波長#5に割り当てられている。光波長#iに割り当てられているタイムスロットにマッピングされたクライアント信号は、伝送フレームOTLCn.n#iのパラレル信号により、光波長#iの光サブキャリアにより伝送される。なお、図7に示すタイムスロットは、スロット数が50である例を示したが、スロット数は、これに限定されない。タイムスロット数は、50を超えてもよい。
タイムスロットへの分割は、光チャネル毎に行われる。
ここで、使用不可能に設定されているタイムスロットが存在する場合における、未割り当て正常タイムスロットIDリストの生成方法について説明する。この場合、リスト生成部53は、全タイムスロットのIDから、障害タイムスロットリストに設定されているタイムスロットのIDと、タイムスロット割り当て管理テーブルの割り当てタイムスロットIDに設定されているタイムスロットのIDと、使用不可に設定されているタイムスロットのIDとを除いて未割り当て正常タイムスロットのIDを得る。リスト生成部53は、この得られた未割り当て正常タイムスロットのIDを設定した未割り当て正常タイムスロットIDリストを生成する。
使用不可に設定されているタイムスロットとは、使用不可能な領域に含まれるタイムスロットである。使用不可に設定されているタイムスロットとは、例えば、アベイラビリティ(availability)が使用不可に設定されているタイムスロットである。
すなわち、タイムスロット割り当て部54は、障害論理パスIDリストに設定されている障害論理パスのIDによりタイムスロット割り当て管理テーブルのレコードを特定し、特定したレコードから障害論理パスの優先度を読み出す。さらに、タイムスロット割り当て部54は、正常論理パスIDリストに設定されている正常論理パスのIDによりタイムスロット割り当て管理テーブルのレコードを特定し、特定したレコードから正常論理パスの優先度を読み出す。タイムスロット割り当て部54は、読み出したこれらの優先度を比較し、障害論理パスよりも低い優先度の正常論理パスが正常論理パスIDリストに含まれるか否かを判断する。タイムスロット割り当て部54は、障害論理パスよりも低い優先度の正常論理パスがある場合、その低い優先度の正常論理パスの割り当て先のタイムスロットと、障害論理パスの割り当て先のタイムスロットとを入れ替えるようにタイムスロットの再割り当てを行う。
すなわち、タイムスロット割り当て部54は、第1の再割り当て処理と同様に、障害論理パスIDリストにIDが設定されている障害論理パスの優先度と、正常論理パスIDリストにIDが設定されている正常論理パスの優先度をタイムスロット割り当て管理テーブルから読み出して比較する。タイムスロット割り当て部54は、障害論理パスよりも低い優先度の正常論理パスがある場合、障害論理パスの割り当て先のタイムスロットを、未割り当て正常タイムスロットIDリストにIDが設定されている未割り当て正常タイムスロットに変更する。この変更により、障害論理パスの割り当て先のタイムスロットから障害タイムスロットがなくなった場合は、再割り当てを終了する。割り当て先のタイムスロットを変更しても、障害論理パスの割り当て先の障害タイムスロットの全てを、未割り当て正常タイムスロットに変更できなかった場合、さらに、第1の再割り当て処理と同様の再割り当て処理を行う。つまり、タイムスロット割り当て部54は、障害論理パスの割り当て先のうち未割り当て正常タイムスロットに変更できなかった障害タイムスロットと、低い優先度の正常イベント論理パスの割り当て先のタイムスロットとを入れ替えるようにタイムスロットの再割り当てを行う。
始めに、図14を参照して、第1の再割り当て処理を説明する。図14は、論理パストラヒックのタイムスロットへのマッピング処理を示す図である。まず、初期状態として、タイムスロット割り当て部54は、500Gbpsの光チャネル#1について、論理パス#1~#5をタイムスロットの若い番号から順に詰めるなどしてタイムスロット割り当て処理を行う。そして、タイムスロット割り当て部54は、図14の左上に示す図に示す初期状態のタイムスロット割り当て管理テーブルを生成し、タイムスロット割り当て管理テーブル記憶部に登録している。図14の左下に示す図は、初期状態の論理パス#1~#5のタイムスロットの割り当てを示す。各タイムスロットは、1~50のIDにより特定される。
このように、伝送フレーム多重処理制御部15は、障害タイムスロットに優先度「低」の論理パストラヒックをマッピングするように割当先のタイムスロットを入れ替え、図14の右上に示す図に示すようにタイムスロット割り当て管理テーブルを変更する。図14の右下に示す図は、タイムスロット再割り当て後の伝送フレームを示す。このように、伝送フレーム多重処理制御部15は、空きタイムスロットがない場合は、より低い優先度の論理パスが障害の影響のあるタイムスロットに割り当てされるように、再割り当てを行う。
上述のように、伝送フレーム多重処理制御部15は、障害タイムスロットに論理パストラヒックをマッピングしないようにマッピングを入れ替え、図15の右上に示す図に示すように、タイムスロット割り当て管理テーブルを変更する。図15の右下に示す図は、タイムスロット再割り当て後の伝送フレームを示す。このように、伝送フレーム多重処理制御部15は、空きスロットがある場合は、空きスロットを活用し、できるだけトラヒック断をさせないよう再割り当てを行う。
図16の左下および右下に示す図において、ID9,10,19,20,29,30,39,40,49,50のタイムスロットは、使用不可能な領域に含まれるタイムスロット、すなわち、使用不可に設定されているタイムスロットである(丸印と斜線を組み合わせた記号で示している)。
図16は、論理パストラヒックのタイムスロットへのマッピング処理を示す図である。まず、初期状態として、タイムスロット割り当て部54は、500Gbpsの光チャネル#1について、論理パス#1~#5をタイムスロットの若い番号から順に詰めるなどのタイムスロット割り当て処理を行う。そして、タイムスロット割り当て部54は、図16の左上に示す図に示す初期状態のタイムスロット割り当て管理テーブルを生成し、タイムスロット割り当て管理テーブル記憶部に登録している。図16の左下に示す図は、初期状態の論理パス#1~#5のタイムスロットの割り当てを示す。各タイムスロットは、1~50のIDにより特定される。
上述のように、伝送フレーム多重処理制御部15は、障害タイムスロットに論理パストラヒックをマッピングしないようにマッピングを入れ替え、図16の右上に示す図に示すように、タイムスロット割り当て管理テーブルを変更する。図16の右下に示す図は、タイムスロット再割り当て後の伝送フレームを示す。このように、伝送フレーム多重処理制御部15は、空きスロットがある場合は、空きスロットを活用し、できるだけトラヒック断をさせないよう再割り当てを行う。
処理(2):障害論理パスIDリストに含まれる論理パスよりも低い伝送優先度の論理パスが正常論理パスIDリストに含まれる場合、低い伝送優先度の論理パスの割り当て先のタイムスロットと、障害タイムスロットに割り当てられていた論理パスの割り当て先のタイムスロットと、未割り当て正常タイムスロットIDリストに含まれるタイムスロットとの3つの間で入れ替えるようにタイムスロットの再割り当てを行う。
2 光伝送装置
3 伝送路
10 送信部
20 受信部
11-1~11-4 クライアント信号受信部
12 伝送フレーム多重処理部
13 伝送フレーム送信部
14 伝送フレーム送信障害監視部
15 伝送フレーム多重処理制御部
21 伝送フレーム受信部
22 伝送フレーム逆多重処理部
23-1~23-4 クライアント信号送信部
24 伝送フレーム受信障害監視部
25 伝送フレーム逆多重処理制御部
51 タイムスロット割り当て管理テーブル記憶部
52 障害情報受信部
53 リスト生成部
54 タイムスロット割り当て部
55 割り当て情報送信部
110 送信処理部
120 クライアント信号受信部
121 受信部
122 マッピング部
123 OH処理部
130 多重処理部
131 多重化部
132 フレーミング部
140 ライン側送信処理部
141 インタリーブ部
142-1、142-2、142-3、142-4 OH処理部
143-1、143-2、143-3、143-4 マルチレーン送信部
150 受信処理部
160 ライン側受信処理部
161-1、161-2、161-3、161-4 マルチレーン受信部
162-1、162-2、162-3、162-4 OH処理部
163 デインタリーブ部
170 分離処理部
171 デフレーミング部
172 逆多重化部
180 クライアント信号送信部
181 OH処理部
182 デマッピング部
183 送信部
210 ODU-SW
220 送信機
230 受信機
800 OTNフレーマ
Claims (8)
- 伝送優先度をそれぞれ有する複数の論理パスに光チャネルの複数のタイムスロットを割り当て、前記複数の論理パスにより受信した複数のクライアント信号を前記複数の論理パスに割り当てられている前記複数のタイムスロットに割り当て、前記複数のタイムスロットに対応付けられた複数の光波長を用いた複数の光サブキャリアにより前記複数のクライアント信号を伝送する伝送装置におけるフレーマであって、
高い伝送優先度を有する論理パスに割り当てられているタイムスロットに対応する光波長を使用しない場合、前記使用しない光波長に対応した前記タイムスロットを避けて前記高い伝送優先度を有する論理パスに前記複数のタイムスロットの少なくとも一つを割り当てることにより、前記高い伝送優先度を有する論理パスに割り当てられている前記タイムスロットを変更するタイムスロット割り当て部を備えるフレーマ。 - 前記タイムスロット割り当て部は、前記使用しない光波長に対応した前記タイムスロットに割り当てられている前記論理パスと、前記使用しない光波長に対応した前記タイムスロットに割り当てられている前記論理パスよりも伝送優先度が低く、かつ、前記複数の光波長のうち正常な光波長に対応したタイムスロットに割り当てられている論理パスとの間で割り当て先のタイムスロットを入れ替えるようにタイムスロットの再割り当てを行う請求項1に記載のフレーマ。
- 前記タイムスロット割り当て部は、前記使用しない光波長に対応した前記使用しないタイムスロットに割り当てられている前記論理パスの割り当て先を、前記複数の光波長のうち正常な光波長に対応し、かつ、論理パスが割り当てられていないタイムスロットに変更する請求項1に記載のフレーマ。
- 前記タイムスロット割り当て部は、前記使用しない光波長に対応した前記使用しないタイムスロットに割り当てられている前記論理パスの割り当て先を、前記複数の光波長のうち正常な光波長に対応し、論理パスが割り当てられておらず、かつ使用不可に設定されていないタイムスロットに変更する請求項1に記載のフレーマ。
- 伝送優先度をそれぞれ有する複数の論理パスに光チャネルの複数のタイムスロットを割り当て、前記複数の論理パスにより受信した複数のクライアント信号を前記複数の論理パスに割り当てられている前記複数のタイムスロットに割り当て、前記複数のタイムスロットに対応付けられた複数の光波長を用いた複数の光サブキャリアにより前記複数のクライアント信号を伝送する伝送装置におけるフレーマが行うフレーミング方法であって、
高い伝送優先度を有する論理パスに割り当てられているタイムスロットに対応する光波長を使用しない場合、前記使用しない光波長に対応した前記タイムスロットを避けて前記高い伝送優先度を有する論理パスに前記複数のタイムスロットの少なくとも一つを割り当てることにより、前記高い伝送優先度を有する論理パスに割り当てられている前記タイムスロットを変更するタイムスロット割り当てステップを有するフレーミング方法。 - 前記タイムスロット割り当てステップは、前記使用しない光波長に対応した前記タイムスロットに割り当てられている前記論理パスと、前記使用しない光波長に対応した前記タイムスロットに割り当てられている前記論理パスよりも伝送優先度が低く、かつ、前記複数の光波長のうち正常な光波長に対応したタイムスロットに割り当てられている論理パスとの間で割り当て先のタイムスロットを入れ替えるようにタイムスロットの再割り当てを行うことを有する請求項5に記載のフレーミング方法。
- 前記タイムスロット割り当てステップは、前記使用しない光波長に対応した前記タイムスロットに割り当てられている前記論理パスの割り当て先を、前記複数の光波長のうち正常な光波長に対応し、かつ、論理パスが割り当てられていないタイムスロットに変更する請求項5に記載のフレーミング方法。
- 前記タイムスロット割り当てステップは、前記使用しない光波長に対応した前記タイムスロットに割り当てられている前記論理パスの割り当て先を、前記複数の光波長のうち正常な光波長に対応し、論理パスが割り当てられておらず、かつ、使用不可に設定されていないタイムスロットに変更することを有する請求項5に記載のフレーミング方法。
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018050236A (ja) * | 2016-09-23 | 2018-03-29 | Nttエレクトロニクス株式会社 | フレーム処理回路およびマルチチャネル伝送システム |
JP2020503769A (ja) * | 2016-12-26 | 2020-01-30 | 華為技術有限公司Huawei Technologies Co.,Ltd. | フレキシブルイーサネットに基づいてサービスフローを送信するための方法および装置、ならびに通信システム |
JP2020508007A (ja) * | 2017-02-16 | 2020-03-12 | ホアウェイ・テクノロジーズ・カンパニー・リミテッド | フレキシブルイーサネットにおいてデータを伝送する方法、およびデバイス |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015198571A1 (ja) * | 2014-06-25 | 2015-12-30 | 日本電気株式会社 | マルチキャリア光送信器、マルチキャリア光受信器、およびマルチキャリア光伝送方法 |
CN107005326B (zh) * | 2014-11-28 | 2019-04-02 | 日本电信电话株式会社 | 成帧器和成帧方法 |
US9992703B2 (en) * | 2016-04-04 | 2018-06-05 | Cisco Technology, Inc. | Insertion of management packet into a deterministic track |
CN107566074B (zh) * | 2016-06-30 | 2019-06-11 | 华为技术有限公司 | 光传送网中传送客户信号的方法及传送设备 |
CN110224946B (zh) * | 2018-03-01 | 2022-05-27 | 中兴通讯股份有限公司 | 一种业务发送方法及装置、业务接收方法及装置 |
CN110392317B (zh) | 2018-04-17 | 2022-07-26 | 华为技术有限公司 | 一种信号发送方法和装置 |
US11923968B2 (en) * | 2021-03-01 | 2024-03-05 | Fujitsu Limited | Optical transmission device, optical transmission system and method of updating the optical transmission device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010136380A (ja) * | 2008-12-08 | 2010-06-17 | Korea Electronics Telecommun | 擬似反転多重化/逆多重化方法及び装置 |
JP2012004839A (ja) * | 2010-06-16 | 2012-01-05 | Nippon Telegr & Teleph Corp <Ntt> | デジタル伝送システム及びデジタル伝送方法 |
US20130216217A1 (en) * | 2012-02-17 | 2013-08-22 | Tejas Networks Limited | Method and system for protecting traffic of a plurality of work odus over a protect odu |
WO2013125621A1 (ja) * | 2012-02-22 | 2013-08-29 | 日本電信電話株式会社 | マルチレーン伝送装置及びマルチレーン伝送方法 |
CN103533464A (zh) * | 2013-09-13 | 2014-01-22 | 华为技术有限公司 | 迁移数据的方法和通信节点 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3516972B2 (ja) * | 1993-04-22 | 2004-04-05 | 株式会社東芝 | 通信システム |
US5764392A (en) * | 1993-10-19 | 1998-06-09 | International Business Machines Corporation | Access control system for a multi-channel transmission ring |
SE513221C2 (sv) * | 1998-04-17 | 2000-07-31 | Net Insight Ab | Förfarande och anordning för allokering av tidluckor till en kanal i ett kretskopplat tidsmultiplexerat nät |
EP1698205B1 (en) | 2003-12-23 | 2013-12-11 | Telecom Italia S.p.A. | System and method for the automatic setup of switched circuits based on traffic prediction in a telecommunications network |
CN100428732C (zh) * | 2003-12-24 | 2008-10-22 | 华为技术有限公司 | 集成交叉交换单元及其业务调度方法 |
WO2006040903A1 (ja) * | 2004-10-14 | 2006-04-20 | Tokyo Denki University | 交換ノード及び交換ノード制御方法 |
JP5359202B2 (ja) * | 2008-11-06 | 2013-12-04 | 富士通株式会社 | フレーム生成装置、光伝送システム、フレーム生成方法および光伝送方法 |
JP5402556B2 (ja) * | 2009-11-19 | 2014-01-29 | 富士通株式会社 | データ伝送システム,端局装置およびデータ伝送方法 |
JP6020235B2 (ja) * | 2013-02-14 | 2016-11-02 | 富士通株式会社 | 伝送方法、伝送装置、および伝送システム |
US9455795B2 (en) * | 2013-04-11 | 2016-09-27 | Nec Corporation | Optical network switching using N:N transponder through time-domain multiplexing and burst mode access |
JP6536562B2 (ja) * | 2014-02-25 | 2019-07-03 | 日本電気株式会社 | 光ネットワーク制御装置および光ネットワーク制御方法 |
EP3226449B1 (en) * | 2014-11-28 | 2019-08-14 | Nippon Telegraph and Telephone Corporation | Framer, optical transmission device, and framing method |
EP3208958B1 (en) * | 2014-11-28 | 2019-08-21 | Nippon Telegraph and Telephone Corporation | Framer and framing method |
CN107005326B (zh) * | 2014-11-28 | 2019-04-02 | 日本电信电话株式会社 | 成帧器和成帧方法 |
CN105744385B (zh) * | 2014-12-10 | 2020-06-16 | 中兴通讯股份有限公司 | 一种光突发传送网的传输方法和*** |
-
2015
- 2015-11-27 CN CN201580064078.2A patent/CN107005326B/zh active Active
- 2015-11-27 US US15/526,835 patent/US10230457B2/en active Active
- 2015-11-27 JP JP2016561966A patent/JP6412158B2/ja active Active
- 2015-11-27 WO PCT/JP2015/083466 patent/WO2016084953A1/ja active Application Filing
- 2015-11-27 EP EP15862214.2A patent/EP3208956B1/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010136380A (ja) * | 2008-12-08 | 2010-06-17 | Korea Electronics Telecommun | 擬似反転多重化/逆多重化方法及び装置 |
JP2012004839A (ja) * | 2010-06-16 | 2012-01-05 | Nippon Telegr & Teleph Corp <Ntt> | デジタル伝送システム及びデジタル伝送方法 |
US20130216217A1 (en) * | 2012-02-17 | 2013-08-22 | Tejas Networks Limited | Method and system for protecting traffic of a plurality of work odus over a protect odu |
WO2013125621A1 (ja) * | 2012-02-22 | 2013-08-29 | 日本電信電話株式会社 | マルチレーン伝送装置及びマルチレーン伝送方法 |
CN103533464A (zh) * | 2013-09-13 | 2014-01-22 | 华为技术有限公司 | 迁移数据的方法和通信节点 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3208956A4 * |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018050236A (ja) * | 2016-09-23 | 2018-03-29 | Nttエレクトロニクス株式会社 | フレーム処理回路およびマルチチャネル伝送システム |
JP2020503769A (ja) * | 2016-12-26 | 2020-01-30 | 華為技術有限公司Huawei Technologies Co.,Ltd. | フレキシブルイーサネットに基づいてサービスフローを送信するための方法および装置、ならびに通信システム |
US11018985B2 (en) | 2016-12-26 | 2021-05-25 | Huawei Technologies Co., Ltd. | Method and apparatus for transmitting service flow based on flexible Ethernet, and communication system |
JP2021100255A (ja) * | 2016-12-26 | 2021-07-01 | 華為技術有限公司Huawei Technologies Co.,Ltd. | フレキシブルイーサネットに基づいてサービスフローを送信するための方法および装置、ならびに通信システム |
JP7140862B2 (ja) | 2016-12-26 | 2022-09-21 | 華為技術有限公司 | フレキシブルイーサネットに基づいてサービスフローを送信するための方法および装置、ならびに通信システム |
US11496405B2 (en) | 2016-12-26 | 2022-11-08 | Huawei Technologies Co., Ltd. | Method and apparatus for transmitting service flow based on flexible ethernet, and communication system |
JP2020508007A (ja) * | 2017-02-16 | 2020-03-12 | ホアウェイ・テクノロジーズ・カンパニー・リミテッド | フレキシブルイーサネットにおいてデータを伝送する方法、およびデバイス |
CN111953450A (zh) * | 2017-02-16 | 2020-11-17 | 华为技术有限公司 | 一种灵活以太网中传输数据的方法及设备 |
US11115153B2 (en) | 2017-02-16 | 2021-09-07 | Huawei Technologies Co., Ltd. | Method for transmitting data in flexible ethernet and device |
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