WO2013157171A1 - 通信システム、親局装置、子局装置、制御装置、および通信制御方法 - Google Patents
通信システム、親局装置、子局装置、制御装置、および通信制御方法 Download PDFInfo
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- WO2013157171A1 WO2013157171A1 PCT/JP2013/000120 JP2013000120W WO2013157171A1 WO 2013157171 A1 WO2013157171 A1 WO 2013157171A1 JP 2013000120 W JP2013000120 W JP 2013000120W WO 2013157171 A1 WO2013157171 A1 WO 2013157171A1
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- station device
- wavelength
- slave station
- onu
- master station
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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
- H04B10/27—Arrangements for networking
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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
- H04B10/27—Arrangements for networking
- H04B10/272—Star-type networks or tree-type networks
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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
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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
- H04J14/0249—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
- H04J14/0254—Optical medium access
- H04J14/0256—Optical medium access at the optical channel layer
- H04J14/0257—Wavelength assignment algorithms
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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
- H04J14/0254—Optical medium access
- H04J14/0267—Optical signaling or routing
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/12—Arrangements for remote connection or disconnection of substations or of equipment thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/403—Bus networks with centralised control, e.g. polling
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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
- H04J14/0254—Optical medium access
- H04J14/0256—Optical medium access at the optical channel layer
- H04J14/0258—Wavelength identification or labelling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Definitions
- the present invention relates to a communication system in which a master station device and a plurality of slave station devices are connected via a common line, and a communication control method, master station device, slave station device, and control device applicable to the communication system.
- the present invention relates to a PON (Passive Optical Network) system including an OLT (Optical Network Terminal) and a plurality of ONUs (Optical Network Unit).
- OLT Optical Network Terminal
- ONUs Optical Network Unit
- optical communication systems such as PON systems have rapidly spread in the access network connecting the station side (master station device) and the user home side (slave station device) because of its high speed and economy.
- the amount of data used by users is increasing year by year, and the transmission speed has been increased to 150 M / bps, 600 M / bps, 1 G / bps, and 10 G / bps even in the PON system.
- device technology such as an optical transmitter / receiver cannot catch up and costs increase.
- an ONU that is a slave station apparatus can use only one of a plurality of wavelengths, which makes the management and procurement of the ONU inconvenient. For this reason, it is desirable for the ONU to be able to use any wavelength with a variable wavelength for reception or transmission and one type of ONU (colorless ONU).
- the OLT which is the master station device
- the ONU that can operate with multiple wavelengths
- the present invention has been made to solve the above-described problem, and a master station device and a plurality of slave station devices are connected via a transmission line, and at least one communication in the downlink direction and the uplink direction is performed with a plurality of wavelengths. It is an object of the present invention to smoothly select a wavelength used by an ONU having a variable wavelength, and smoothly perform communication between the ONU and the OLT.
- a communication system is a communication system in which a master station device and a plurality of slave station devices are connected via an optical transmission line, and at least one communication in a downlink direction and an uplink direction is performed using a plurality of wavelengths.
- the master station device assigns a wavelength to be used for communication to the slave station device, generates a control signal for notifying the slave station device of the assigned wavelength, and transmits the control signal generated by the control unit to the slave station device.
- the slave station device includes an optical transceiver that communicates with the master station device using a wavelength based on a control signal received from the master station device.
- the master station device is a communication system in which a master station device and a plurality of slave station devices are connected via an optical transmission line, and at least one communication in the upstream direction and the downstream direction is performed using a plurality of wavelengths.
- a control unit that generates a control signal that assigns a wavelength to be used for communication to a slave station device and notifies the assigned wavelength to the slave station device, and And an optical transmitter that transmits a control signal to the slave station device.
- the slave station device is a communication system in which a master station device and a plurality of slave station devices are connected via an optical transmission line, and at least one of communication in the downlink direction and the uplink direction is performed using a plurality of wavelengths.
- a control signal including information related to the wavelength assigned to the own device by the master station device, and using the wavelength based on the received control signal,
- An optical transceiver for performing the communication is a communication system in which a master station device and a plurality of slave station devices are connected via an optical transmission line, and at least one of communication in the downlink direction and the uplink direction is performed using a plurality of wavelengths.
- a control signal including information related to the wavelength assigned to the own device by the master station device, and using the wavelength based on the received control signal,
- An optical transceiver for performing the communication.
- the control device is a communication system in which a master station device and a plurality of slave station devices are connected via an optical transmission line, and at least one of uplink and downlink communications is performed using a plurality of wavelengths.
- a control device applicable to the master station device which assigns a wavelength to be used for communication to the slave station device and generates a control signal for notifying the slave station device of the assigned wavelength.
- the control device is a communication system in which a master station device and a plurality of slave station devices are connected via an optical transmission line, and at least one of uplink and downlink communications is performed using a plurality of wavelengths.
- a master station device and a plurality of slave station devices are connected via an optical transmission line, and the slave station device uses at least one of transmission and reception with the master station device using a plurality of wavelengths.
- a communication control method applicable to a communication system to perform wherein a master station device assigns a wavelength to be used for communication to a slave station device and notifies the slave station device of the assigned wavelength, and the master station device in the notification step And a data transmission / reception step in which the slave station device transmits or receives data to or from the master station device based on the wavelength notified from.
- the variable wavelength used by the ONU is more appropriately selected, and communication between the ONU and the OLT can be performed smoothly.
- FIG. 1 shows a configuration example of a PON system according to the present embodiment.
- a PON system according to the first embodiment includes a station-side terminal device (Optical Line Terminal, hereinafter referred to as “OLT” as appropriate) 10 as a master station device and a subscriber-side terminal device as a slave station device.
- OLT Optical Line Terminal
- ONU Optical Network Unit
- the OLT 10 and the plurality of ONUs 20 share a part of the subscriber line 30, and the power splitter 40 branches the subscriber line 30 in accordance with the number of ONUs 20-1 to 20-n.
- the ONU 20 is connected to a terminal (not shown in FIG. 1), and the OLT 10 is connected to an upper network (not shown in FIG. 1).
- the subscriber line 30 is an optical transmission line, and here, an optical fiber is used.
- the subscriber line 30 and the power splitter 40 can transmit, distribute, and combine optical signals having a plurality of wavelengths.
- the direction from the OLT 10 to the ONU 20 is a downlink direction, and the communication is a downlink communication.
- the direction from the ONU 20 to the OLT 10 is the upstream direction, and the communication is the upstream direction communication.
- the OLT 10 includes a PON control unit 11 that performs processing on the OLT side based on the PON protocol, and a WDM (Wavelength Division Multiplexing) coupler (WDM) 12, 13-1, 13-2 that multiplexes optical signals of different wavelengths. It has. Although omitted in FIG. 1, between a reception buffer that is a buffer for storing uplink data received from the ONU 20, a transmission buffer that is a buffer for storing downlink data to be transmitted to the ONU 20, and an upper network. And a physical layer processing unit (PHY) that realizes a physical interface function of NNI (Network Node Interface).
- NNI Network Node Interface
- the PON control unit 11 of the OLT 10 performs upstream data bandwidth allocation so as to give transmission permission to the ONU 20 so that the transmission time zone and the use wavelength do not overlap each other, thereby preventing transmission data from colliding with each ONU 20.
- the PON control unit 11 holds a management table related to capability and the like for wavelength switching of the ONU 20.
- the OLT 10 can also refer to this management table to determine the wavelength after switching (wavelength of the transfer destination) when switching the wavelength of the ONU 20.
- the OLT 10 includes optical transmitters (Tx) 14-1 to 14-4 that perform optical signal transmission processing, and can perform optical signal transmission processing of wavelengths ⁇ 11 to ⁇ 14, respectively.
- the optical signals transmitted from the optical transmitters (Tx) 14-1 to 4 are wavelength-multiplexed by a WDM (Wavelength-Division-Multiplexing) coupler (WDM) 13-1, and the upstream data and the downstream data are wavelength-multiplexed by the WDM 12.
- WDM Widelength-Division-Multiplexing
- optical receivers (Rx) 15-1 to 15-4 that perform optical signal reception processing are provided, and it is possible to perform optical signal reception processing of wavelengths ⁇ 21 to ⁇ 24, respectively.
- the optical signal received from the ONU 20 and separated by the WDM 12 is separated into optical signals of wavelengths ⁇ 21 to ⁇ 24 by the WDM 13-2, and reception processing is performed by the optical receivers (Rx) 15-1 to 4, respectively.
- the ONU 20 includes a PON control unit 21 that performs processing on the ONU side based on the PON protocol, and a WDM 22 that multiplexes the upstream signal and the downstream signal on the ONU side, and is omitted in FIG.
- a transmission buffer (upstream buffer) that is a buffer for storing transmission data (upstream data) to the OLT 10
- a reception buffer (downstream buffer) that is a buffer for storing reception data (downstream data) from the OLT 10
- a physical layer processing unit (PHY) that realizes a physical interface function of UNI (User Network Interface) with each terminal connected to the ONU 20 is provided.
- the ONU 20 includes an optical transceiver that performs optical signal transmission processing, and includes an optical receiver (Rx) 23 and an optical transmitter (Tx) 24.
- the optical receiver (Rx) 23 can perform reception processing of optical signals having wavelengths ⁇ 11 to ⁇ 14.
- the optical transmitter (Tx) 24 can perform transmission processing of optical signals having wavelengths ⁇ 21 to ⁇ 24.
- upstream data and downstream data are wavelength-multiplexed.
- the optical receiver (Rx) 23 of the ONU 20 is a wavelength-tunable optical receiver that can receive an optical signal of any one of the wavelengths ⁇ 11 to ⁇ 14 by switching a filter or the like.
- the optical transmitter (Tx) 24 is a wavelength-tunable optical transmitter, and can transmit an optical signal of any one of the wavelengths ⁇ 21 to ⁇ 24 by switching a filter or the like.
- communication is performed using wavelengths ⁇ 11 to ⁇ 14 in the downstream direction (from OLT to ONU) and ⁇ 21 to ⁇ 24 in the upstream direction (direction from ONU to OLT).
- the ONU 20 performs communication by selectively using signals of these wavelengths in each of the upstream and downstream directions among these wavelengths.
- the OLT 10 notifies the ONU 20 of the wavelength and communication band to be used, and performs communication without colliding optical signals from each ONU 20 by performing time division multiplexing for each wavelength. Needless to say, the number of wavelengths used for transmission or reception is not limited to this.
- FIG. 2 shows a flowchart regarding the operation of the communication system according to Embodiment 1 of the present invention.
- the ONU 20 capable of transmitting / receiving all wavelengths (downward direction: ⁇ 11 to ⁇ 14, upstream direction: ⁇ 21 to ⁇ 24) usable in the PON system is turned on, and a terminal connected to the ONU 20 performs OLT.
- a case will be described as an example in which communication is performed with a higher-level network through this, and then the wavelength used (wavelength for transmitting and receiving) of the ONU 20 is switched.
- the OLT 1 performs a discovery process in order to register the newly connected (power-on) ONU 20 (step S101).
- the ONU 20 is requested to notify the capability information in order to collect capability information related to wavelength switching (step S102).
- the ONU 20 Upon receiving this request, the ONU 20 notifies the OLT 10 of capability information regarding usable wavelengths, switching times, etc. of the own device, and the OLT 10 receives this information and grasps the capability information of the newly registered ONU ( Step S103). Based on the notified capability information, a wavelength to be used for the ONU is allocated, and the allocated wavelength is notified to the ONU 20 (step S104).
- the ONU 20 notified of the used wavelength performs communication with the OLT 10 using the wavelength based on the notification (step S105).
- step S106 executes communication between the OLT 10 and the ONU 20
- the ONU that changes the used wavelength on the OLT 10 side The used wavelength is selected (step S107), and the wavelength after the change (relocation) is notified to the ONU 20 (step S108).
- the ONU 20 notified of the wavelength change performs its own wavelength switching operation, switches to the wavelength notified from the OLT 10 (step S109), and communicates with the OLT 10 using the switched wavelength (step S110). ). If it is determined that the communication is to be terminated, the communication is terminated. If the communication is to be continued, the process proceeds to step S105 (step S111). Details of each process will be described below.
- the OLT 10 performs a registration process for the ONU 20 newly connected to the PON system, and assigns an ID to each ONU 20.
- the OLT 20 performs a discovery process using a predetermined base wavelength (here, ⁇ 11). That is, the PON control unit 11 of the OLT 20 generates a discovery control signal, and outputs the discovery control signal to the optical transmitter (Tx1) 14-1 that can transmit the optical signal having the wavelength ⁇ 11.
- the optical transmitter (Tx1) 14-1 that has received the discovery control signal periodically transmits the discovery control signal to the ONU 20.
- the ONU 20 is set to be able to receive the optical signal of this base wavelength when the power is turned on.
- the ONU 20 controls the registration request signal including its own individual number and the like for discovery control. It transmits with respect to OLT10 in the allocation time notified by the signal.
- the optical transmitter (Rx) 24 is also set so as to be able to transmit an optical signal having a predetermined base wavelength (here, ⁇ 21) when the power is turned on, and uses the wavelength ⁇ 21 for the OLT 10. Send a registration request signal.
- the base wavelength does not have to be a wavelength dedicated to discovery processing, and a part of the wavelength band for data communication may be used.
- the base wavelength predetermined for the discovery process is used, but the present invention is not limited to this.
- the OLT 10 transmits a discovery control signal using all the downstream wavelengths ( ⁇ 11 to ⁇ 14) used in the PON system
- the ONU 20 receives and receives a discovery control signal of any wavelength.
- the registration request signal may be transmitted to the OLT 10 based on the wavelength and the transmission time zone specified by the discovery control signal.
- the OLT 10 that has received the registration request signal from the ONU 20 gives an LLID (Logical Link ID) to the ONU 20 and registers the ONU 20 in its own device. Also, a registration completion notification is transmitted to the ONU 20 whose registration has been completed, and the discovery process is terminated.
- a delay time (Round Trip Time, hereinafter abbreviated as “RTT” as appropriate) is measured using the above-described control signal, and is managed in association with the LLID.
- the operation of notifying capability information for collecting capability information of the ONU 20 (steps S102 and S103) will be described.
- the OLT 10 requests the ONU 20 that has completed the registration process to notify the capability information using the optical signal having the base wavelength ⁇ 11 (capability information request signal).
- the ONU 20 that has received the capability information request signal transmits to the OLT 10 information (capability information) relating to a wavelength that can be used by the own device and a switching time when switching to another wavelength.
- FIG. 3 shows an example of the format of capability information notification.
- the ID given to the own device, the optical transmitter / receiver of the own device can receive light of wavelengths ⁇ 11 to ⁇ 14, can transmit optical signals of wavelengths ⁇ 21 to ⁇ 24, and is specified. It is possible to notify information related to the wavelength switching of the ONU 20 such that a switching time t1 is required when switching from one wavelength to another.
- the wavelength at which this capability information notification is performed is performed using the same wavelength (basic wavelength) as in the above-described discovery processing, but may be performed using other wavelengths.
- the wavelength used for capability information notification may be notified to the ONU 20 in the above-described discovery process or using the wavelength for which the discovery process has been performed.
- a wavelength to be used (for example, ⁇ 12) may be determined in advance.
- the capability information notification is performed after the end of discovery has been described, it may be performed in the above-described discovery process.
- FIG. 4 shows an example of the ONU management table.
- the ONU management table manages information relating to IDs assigned to each ONU, operable wavelengths (Rx, Tx), wavelengths actually being operated, and switching time in association with each other.
- the ONU management table is updated based on the received capability information.
- Such information is managed for each ONU 20 registered in the OLT 10.
- step S104 of notifying the wavelength (initial wavelength) used in the PON system from the OLT 1 to the ONU 20 for which the discovery process has been completed will be described. Note that this operation can be omitted when the initial wavelength is determined in advance by a contract or the like.
- the initial wavelength is notified from the OLT 10 to the ONU 20 for which the discovery process has been completed.
- FIG. 5 shows an example of the format of the initial use wavelength notification.
- the initial wavelength may be any wavelength as long as the ONU 20 that receives this notification is usable, but here, the OLT 10 uses any one of the following methods (A1) to (A3) or a combination of these methods.
- the initial wavelength of the ONU 20 is determined and notified.
- (A1) Predetermined wavelength in a contract, etc.
- an initial wavelength is determined in a contract with a user in advance
- information on the wavelength is stored in the OLT 10 in association with the ONU 20, and the ONU 20 becomes communicable.
- the corresponding initial wavelength is notified to the ONU 20.
- the wavelength to be used in advance it becomes possible to start communication at an early stage.
- the wavelength can be automatically used so that the wavelength to be used is not notified.
- (A2) Determination based on wavelength priority order The wavelength use priority order and the maximum number of ONUs that can be accommodated for each wavelength are determined, and the initial wavelength of the ONU 20 is determined based on this priority order. For example, assuming that the wavelength ⁇ 11 (base wavelength) has the highest priority in the downlink direction, the priorities are set in order of ⁇ 12, ⁇ 13, and ⁇ 14. Similarly, in the downlink direction, the priority is assumed to be higher in order from ⁇ 21 (basic wavelength). The newly registered ONU 20 after completion of the discovery process or the like is first set to the base wavelength ⁇ 11 / baseband wavelength ⁇ 21 as the initial wavelength.
- the same operation is performed every time the ONU 20 is newly registered, and when the number of ONUs 20 using the downlink base wavelength ⁇ 11 / uplink base wavelength ⁇ 21 reaches the maximum number of accommodated ONUs, the newly registered ONU 20
- the priority is set to the downstream wavelength ⁇ 12 / upstream wavelength ⁇ 22.
- the OLT 10 monitors the traffic volume with the ONU 20 and calculates the usage rate for each wavelength.
- a wavelength with a low usage rate is determined as the initial wavelength of the ONU 20.
- the wavelength used for notification need not be one. That is, a configuration may be adopted in which the ONU 2 is notified of a plurality of wavelengths that can be used, and the wavelengths used on the ONU 20 side are selected.
- the ONU 20 notified of the initial wavelength from the OLT 10 communicates with the OLT 10 using the notified wavelength.
- the downlink base wavelength ⁇ 11 / uplink base wavelength ⁇ 21 is a use wavelength.
- the PON control unit 11 stores downlink data (downlink communication data) received from the upper network via the PHY in a transmission buffer on the OLT 10 side.
- the PON control unit 12 reads the downlink data stored in the transmission buffer and outputs it to the optical transmitter (Tx) 14-1 capable of transmitting an optical signal having the wavelength ⁇ 11.
- the optical transmitter (Tx) 14-1 outputs the transmission data as an optical signal, and the WDM 13-1 and the WDM 12 perform wavelength multiplexing and output to the ONU 20 via the subscriber line 30 as a downstream signal.
- the PON control unit 11 transmits a control signal such as transmission band allocation for transmitting a transmission permission instruction
- the control signal generated by the PON control unit 11 is output to the optical transmitter (Tx) 14-1. Thereafter, the data is transmitted to the ONU 20 in the same manner as when transmitting downlink data.
- the WDM 22 when receiving the downlink signal from the OLT 10, the WDM 22 separates the downlink signal and outputs it to the optical receiver (Rx) 23.
- the optical receiver (Rx) 23 is set so as to be able to receive an optical signal having a wavelength ⁇ 11, and the optical receiver (Rx) 23 converts the downstream signal into an electrical signal and outputs the electrical signal to the PON control unit 21.
- the PON control unit 21 stores the downlink data output from the optical receiver (Rx) 23 in the reception buffer.
- the PON control unit 21 reads the downlink data stored in the reception buffer and outputs it to the PHY according to the destination of the data.
- the PHY that has received the downlink data performs a predetermined process on the downlink data and transmits it to a terminal connected to the own device.
- the PON control unit 21 when transmitting uplink data from the ONU 20, stores the uplink data acquired from the terminal connected to the ONU 20 via the PHY in the transmission buffer on the ONU 20 side. Then, the uplink data stored in the transmission buffer is read based on the transmission band given from the OLT 10 and output to the optical transmitter 24.
- the optical transmitter (Tx) 24 is switched so as to be able to transmit the optical signal of the used wavelength ⁇ 21 notified from the OLT 10, and the optical transmitter (Tx) 24 converts the upstream data into an optical signal (upstream signal). The data is converted and transmitted to the OLT 10 via the WDM 22 and the subscriber line 30.
- the PON control unit 11 of the OLT 1 stores the uplink data received from the ONU 20 via the subscriber line 30, the WDM 12, 13-2, and the optical receiver (Rx1) 15-1 in the reception buffer. Further, the PON control unit 11 reads the uplink data stored in the reception buffer and outputs it to the upper network via the PHY.
- the OLT 10 determines the change of the used wavelength for the specific ONU 20 and assigns a new wavelength to the ONU 20 to be changed. Any condition may be used for switching the wavelength of the ONU 20, but here, one of the following (B1) and (B2) or a combination thereof is used.
- (B1) Traffic monitoring The OLT 10 monitors the traffic volume for each wavelength in the PON system, and when the traffic volume exceeds a predetermined numerical value, determines the change of the wavelength to be used for the specific ONU 20 that uses the wavelength. Further, a band usage rate may be used as a condition for changing the wavelength.
- the OLT 10 monitors the number of ONUs 20 that use each wavelength, and the number of ONUs 20 accommodated in a specific wavelength is equal to or greater than a predetermined number (maximum number of accommodated ONUs). If this is the case, determine the change in wavelength to use for the particular ONU 20 that uses that wavelength (eg, a newly added ONU).
- a control signal for notifying execution of wavelength switching to a specific ONU that uses the wavelength for which wavelength switching has been determined is generated, and a Holdover message is transmitted to the ONU 20 Send.
- the wavelength used by the ONU 20 to be changed depends on the operator's choice. For example, for users who do not allow instantaneous interruption in the contract, the wavelength is not changed, and the traffic volume for each ONU 20 is monitored.
- a rule such as determining to change the wavelength of the ONU 20 having a large traffic volume based on the communication performance so far may be set.
- the OLT 10 determines the wavelength of the switching destination based on the capability information notified from the ONU 20. That is, the OLT 10 manages the operable wavelength of each ONU 20, and instructs (may be requested) to switch to the operable wavelength of the ONU 20 to be switched.
- any wavelength that can be used by the ONU 20 to be switched may be switched to any wavelength, but here, for example, the following (C1) to (C3) are similar to the above-described method of determining the initial wavelength.
- the wavelength of the transfer destination is determined by any one of these methods or a combination thereof.
- C1 Predetermined wavelength by contract, etc.
- the wavelength to be changed in advance is determined by contract with the user.
- C2 Determination based on wavelength priority order
- the wavelength use priority order and the maximum number of ONUs accommodated for each wavelength are determined, and the initial wavelength of the ONU 20 is determined based on this priority order.
- (C3) Wavelength with Low Usage Rate The OLT 10 monitors the traffic volume with the ONU 20 and calculates the usage rate for each wavelength. When changing the use wavelength of the ONU 20, a wavelength with a low use rate is determined as the initial wavelength of the ONU 20.
- the wavelength may be switched to another wavelength instead of switching to the adjacent wavelength. For example, if the wavelength is long in the order of wavelengths ⁇ 11 to ⁇ 14 and the interval between adjacent wavelengths is small, the ONU 20 that uses the wavelength ⁇ 11 is switched to ⁇ 13 or ⁇ 14 instead of the adjacent ⁇ 12. If the distance between adjacent wavelengths (wavelength difference) is small, the change in output wavelength due to temperature change etc. can be ignored, so it is necessary to perform temperature compensation etc. By using a different wavelength, there is an effect that it is not necessary to perform temperature compensation or the like.
- the ONU 20 that has received a wavelength change instruction (or request) from the OLT 10 switches from one wavelength to another using one or both of its own optical transmitter and optical receiver.
- the wavelength change notification received by the optical receiver (Rx) 23 of the ONU 20 is converted into an electrical signal and output to the PON control unit 21.
- the PON control unit 21 extracts the wavelength used by the device itself included in the wavelength change notification, and controls the optical transceiver so that the wavelength can be operated.
- the PON control unit 21 that has received the wavelength change notification generates a control signal for switching to the used wavelength and outputs it to the optical transceiver.
- the optical transceiver that has received the control signal for performing the switching switches the variable filters of the optical receiver 23 and the optical transmitter 24 so that the optical receiver can receive the optical signal of the wavelength after the switching.
- the optical transmitter 24 enables transmission of an optical signal having a wavelength after switching.
- the ONU 20 changes the transmission / reception wavelength while maintaining the LLID and the authentication state.
- the communication is stopped (Holdover state) during the wavelength switching period, and an instantaneous interruption occurs.
- an alarm Loss of Burst
- the OLT 10 that has transmitted the wavelength switching notification starts a timer that serves as a reference for alarm suppression, does not regard an alarm before the timer expires as an alarm, and performs processing such as link disconnection performed when an alarm occurs.
- the OLT 10 starts the timer after receiving the response notification for the wavelength change notification from the ONU 20.
- the timer is set in consideration of the switching time, RTT and the like notified from the ONU 20. Thereby, the erroneous detection of the failure resulting from the switching time of the ONU 20 can be prevented.
- the OLT 10 estimates the switching completion time (Holdover end time) from the switching time of the ONU 20 that performs switching with reference to the updated ONU management table in response to the notification of capability information from the ONU 20.
- the estimated holdover end time is reached, a switching completion notification is transmitted to the ONU 20 that is executing the switching operation, and the switching operation is completed. Thereafter, the ONU 20 performs communication using the wavelength after relocation.
- the ONU 20 uses the ID assigned in the discovery process as it is even if the wavelength used changes.
- the OLT 10 associates the upper layer connection with the ONU 20 using the ID of the ONU 20 as a key. Further, the OLT 10 can save power by stopping the optical transceiver related to the unused wavelength. For example, when communicating with the ONU 20 using only the downstream wavelengths: ⁇ 11 / ⁇ 12 and the upstream wavelengths: ⁇ 21 / ⁇ 22, transmitters (Tx3, Tx4) related to the wavelengths of the downstream wavelengths: ⁇ 13 / ⁇ 14 Low power consumption can be realized by stopping the power supply to the receivers (Rx3, Rx4) 15-3, 4 related to 14-3, 4 and the upstream wavelength: ⁇ 23 / ⁇ 24. .
- the OLT 10 may not have RTT information at the relocation wavelength destination. That is, when the wavelength at the relocation destination is used for the first time, a window for re-measuring the distance is provided. After the first time, the round trip time is maintained, and the band is allocated in consideration of the RTT after the relocation. If the difference between the wavelength after switching and the wavelength before switching is small, communication is performed by first allocating the bandwidth using the RTT of the wavelength before switching, and measuring the delay time of the signal in the communication. RTT may be obtained.
- an ONU that can use all wavelengths used in the PON system and an ONU that can use only a part or a single wavelength are mixed.
- the ONUs may be able to use all wavelengths used in the PON system. That is, the present invention can be applied if there is at least one ONU that can use a plurality of wavelengths in at least one of the communication in the downstream direction (OLT ⁇ ONU) and the upstream direction (ONU ⁇ OLT) in the communication system. it can. The same applies to other embodiments described later.
- FIG. 6 shows a sequence diagram representing the operation of the communication system according to the present embodiment.
- the ONU 20-1 capable of transmitting and receiving optical signals of the downstream wavelengths ⁇ 11 to ⁇ 14 and upstream wavelengths ⁇ 21 to ⁇ 24 is turned on to perform communication with the OLT 10.
- the ONU 20-1 When the power of the ONU 20-1 is turned on (P0), the ONU 20-1 is set in a state capable of receiving an optical signal having a base wavelength ⁇ 11, and performs a discovery process by receiving a discovery control signal from the OLT 10 (P10).
- the discovery process is performed using a predetermined wavelength (base wavelength), and using a downstream wavelength: ⁇ 11 and an upstream wavelength ⁇ 21.
- the OLT 10 transmits a capability information request notification to the ONU 20-1 (P11).
- the ONU 20-1 that has received the capability information request notification includes capability information including the wavelengths that can be used by the device (here, downlink wavelengths: ⁇ 11 to ⁇ 14, uplink wavelengths: ⁇ 21 to ⁇ 24) and switching time (here, t1). Is transmitted to the OLT 10 (P12).
- the OLT 10 that has received the capability information from the ONU 20-1 updates the ONU management table held by itself, and the ONU 20-1 can use the downstream wavelengths: ⁇ 11 to ⁇ 14 and the upstream wavelengths: ⁇ 21 to ⁇ 24, and the switching time It is registered that it is t1 (P13).
- the OLT 10 determines the wavelength to be used by the ONU 20-1, and notifies the ONU 20-1 of the determined wavelength (the wavelength in the case where it is determined in advance by a contract or the like) (P14).
- the use wavelength of the ONU 20-1 is assumed to be a downstream wavelength: ⁇ 12 and an upstream wavelength: ⁇ 22.
- the signal exchange between the OLT 10 and the ONU 20-1 so far is performed using the base wavelength (downstream wavelength: ⁇ 11, upstream wavelength: ⁇ 21).
- the ONU 20-1 that has received the notification of the initial use wavelength switches the wavelength (P15).
- this switching operation is not performed.
- the ONU 20-1 performs a data communication operation using the signal of that wavelength (P1-1, P16 to P19).
- the OLT 10 After performing communication using the downstream wavelength: ⁇ 12 and upstream wavelength: ⁇ 22 for a while, when these wavelengths are gradually congested and it is determined that the bandwidth is insufficient, the OLT 10 determines to switch the wavelength used by the ONU 20-1. (P20).
- the wavelength used by the ONU 20-1 is determined based on the ONU management table in which the own apparatus holds the wavelength switching, the usage rate of each wavelength, and the like.
- a wavelength change notification including information on changing the wavelength and information on the wavelength to be changed is transmitted to the ONU 20-1 (P21).
- the ONU 20-1 that has received the wavelength change notification switches the wavelength (P22).
- the OLT 10 estimates the switching completion time, and transmits the switching completion notification to the ONU 20 when the time reaches (P23).
- the switching completion time can be easily estimated.
- the ONU 20 transmits a response message to the OLT 10 after receiving the Holdover message (Holdover end) from the OLT 10 (P24). For this, the OLT 10 can confirm that the ONU 20 has completed wavelength selection.
- the ONU 20 that has received the switch completion notification executes communication with the OLT 10 using the downstream wavelength: ⁇ 13 and the upstream wavelength: ⁇ 23 (P1-2). By performing the above operation, it is possible to efficiently switch wavelengths and perform communication between the OLT 10 and the ONU 20.
- the master station device determines the wavelength used by the slave station device as described above, and notifies the slave station device of the wavelength, so that the slave station device can change the wavelength according to the situation.
- the communication with the master station device can be performed by switching.
- the master station device can efficiently communicate by performing wavelength switching even when different types of slave station devices exist in the communication system. it can.
- power saving can be achieved by stopping the optical transceiver related to the unused wavelength of the master station device.
- Embodiment 2 the OLT monitors the communication status in the communication system and decides to change the wavelength of the ONU.
- a wavelength change request from the ONU is triggered by the wavelength change start trigger.
- the determination in the OLT 10 is the trigger for changing the wavelength.
- the determination in the ONU 20 is the trigger for changing the wavelength.
- the predetermined condition is, for example, a request for switching the wavelength to be used by monitoring the bandwidth (communication time) allocated by the ONU 20 from the OLT 10 and the remaining amount of the transmission buffer of the own device. Determine whether or not.
- the PON control unit 21 When the ONU 20 decides to request the wavelength change, the PON control unit 21 generates a control signal (wavelength change request notification) for requesting the change of the wavelength used by the own device, and the optical transmitter ( Tx) 23.
- the optical transmitter (Tx) 23 that has received the wavelength change request signal transmits to the OLT 10 using the wavelength currently in use in the band allocated from the OLT 10.
- the wavelength change request signal may include capability information related to its own wavelength change.
- the OLT 10 that has received the wavelength change request signal from the ONU 20 determines whether or not to change the wavelength of the ONU 20 that has transmitted the wavelength change request signal based on the communication status of other wavelengths. Determine the previous wavelength.
- FIG. 7 shows a sequence diagram relating to the operation of the communication system according to the second embodiment.
- the ONU 20 that has been turned on executes discovery processing and notifies the OLT 10 of capability information related to wavelength switching.
- the ONU 20 to which the wavelength to be used is assigned from the OLT 10 executes communication with the OLT 10 using the wavelength.
- the ONU 20 After performing communication using the downstream wavelength: ⁇ 12 and upstream wavelength: ⁇ 22 for a while (P1-1), it is determined that these wavelengths are gradually congested and the ONU 20 requests the wavelength switching of the own device (P30). .
- the ONU 20 generates a wavelength change request signal and transmits it to the OLT 10 (P31).
- the OLT 10 that has received the wavelength change request changes the wavelength of the ONU 20 based on the ONU management table in which the device itself switches the wavelength and the usage rate of each wavelength or the wavelength to be used when changing the wavelength. Is determined (P32).
- a wavelength change notification including information on changing the wavelength and information on the wavelength to be changed is transmitted to the ONU 20-1 (P33).
- the ONU 20 that has received the notification of the wavelength change permission (or instruction) from the OLT 10 switches from the wavelength to the other wavelength by using one or both of its own optical transmitter and optical receiver (P34).
- the OLT 10 based on the switching time notified from the ONU 20, the OLT 10 estimates the time when the ONU 20 has switched the wavelength, and sends a switching completion notification (Holdover end message) (P35). Thereafter, communication between the OLT 10 and the ONU 20 is performed using the wavelength after the relocation (P1-2).
- the slave station apparatus switches the wavelength according to the situation and performs communication with the master station apparatus in the same manner as the second embodiment in order to adopt the configuration as described above. Can do. Furthermore, by making it possible to request a wavelength change from the slave station device, it becomes possible to perform wavelength switching according to the status of the slave station device.
- Embodiment 3 the master station device estimates whether the wavelength switching operation of the slave station device has been completed and notifies the completion of switching.
- a Holdover state end notification is sent.
- a case where the slave station apparatus performs the master station apparatus will be described.
- a communication system according to the third embodiment will be described by taking a PON system as an example as in the first and second embodiments. The configuration is the same as in the first embodiment, as shown in FIG.
- step S109 The overall operation of the communication system according to Embodiment 3 is the same as that shown in FIG. Here, the description of the operation similar to that of the first embodiment is omitted, and only the operation for switching the used wavelength (step S109) having a different operation will be described.
- the ONU 20 that has received the wavelength change notification from the OLT 10 switches at least one of the transmission wavelength and the reception wavelength of the own device to the notified wavelength.
- the ONU 20 transmits a Holdover state end notification to the OLT 10 using the wavelength after switching.
- the OLT 10 periodically performs bandwidth allocation so that the ONU 20 can transmit a completion notification after the switching operation is completed.
- the OLT 10 that has received the Holdover state end notification transmits a switch completion notification to the ONU 20 and ends the switch completion operation.
- FIG. 8 shows a sequence diagram relating to the operation in the case of the third embodiment.
- FIG. 8 shows a sequence diagram relating to the operation of the communication system according to the third embodiment.
- the ONU 20 that has been turned on executes discovery processing and notifies the OLT 10 of capability information related to wavelength switching.
- the ONU 20 to which the wavelength to be used is assigned from the OLT 10 executes communication with the OLT 10 using the wavelength.
- the OLT 10 After performing communication using the downstream wavelength: ⁇ 12 and upstream wavelength: ⁇ 22 for a while (P1-1), it is determined that these wavelengths are gradually congested and the OLT 10 performs wavelength switching of the ONU 20-1 ( P32). In this case, the OLT 10 changes the wavelength of the ONU 20-1 based on the ONU management table in which the device itself switches the wavelength and the usage rate of each wavelength or the wavelength used when changing the wavelength. Determine (P32). A wavelength used by the ONU 20-1 is determined, and a wavelength change notification including information on changing the wavelength and information on the wavelength to be changed is transmitted to the ONU 20-1 (P33)
- the ONU 20 that has received the notification of the wavelength change permission (or instruction) from the OLT 10 switches from the wavelength to the other wavelength by using one or both of its own optical transmitter and optical receiver (P34).
- a holdover end notification for notifying that the switching operation is completed and the holdover state is ended is transmitted from the ONU 20-1 to the OLT 10 (P40).
- the OLT 10 that has received the Holdover end notification detects the end of the switching operation of the ONU 20-1, and sends a switch completion notification (Holdover end message) (P35). Thereafter, communication between the OLT 10 and the ONU 20 is performed using the wavelength after the relocation (P1-2).
- the slave station device Since the communication system according to the third embodiment is configured as described above, the slave station device performs wavelength switching according to the situation and communicates with the master station device as in the other embodiments. can do. In addition, by transmitting a Holdover end notification from the ONU 20, it is possible to obtain an effect that the master station device itself does not need to estimate the end of the Holdover of the slave station device.
- a communication system, a master station device, a slave station device, a control device, and a communication control method according to the present invention include a communication system in which a master station device and a plurality of slave station devices are connected via a common line. And is particularly suitable for a communication system in which at least one of the downlink direction and the uplink direction is performed using a plurality of wavelengths.
Abstract
Description
本発明を適用した通信システムについて、PONシステムを例にとり説明する。なお、本発明は、その趣旨を逸脱しない限りPONシステム以外の光通信システムにも適用可能である。図1に、本実施の形態にかかるPONシステムの構成例を示す。図1において、本実施の形態1に係るPONシステムは、親局装置である局側終端装置(Optical Line Terminal,以下、適宜「OLT」と略記する)10と子局装置である加入者側終端装置(Optical Network Unit,適宜「ONU」と略記する)20-1~n(n=2,3,・・・)とを備えている。なお、ここではONUを3台のみ示し、他のONUについては省略しているおり、本発明を適用できるONUの台数は何台でもよい。また、図および以下の説明において、通信システム内において複数存在する同種の装置等には、数字の後に「-」と数字を付して区別している(例えば、ONU20-1)。また、図および以下の説明において、当該装置等を総称する場合、または、区別しない場合には、ONU20のように「-」なしの符号を用いて説明するものとする(例えば、ONU20)。
予めユーザとの契約等で初期波長を定めて、その波長に関する情報をそのONU20と関連付けてOLT10で保持しておき、ONU20が通信可能となった場合に、対応する初期波長をONU20へ通知する。予め使用波長を定めておくことにより、早期に通信を開始することが可能となる。また、ONU20側でも、ディスカバリー処理等が終了した場合、自動的にその波長が使用可能な状態とすることにより、使用する波長を通知しない構成とすることもできる。
波長使用優先順位と波長ごとの最大収容ONU数を決めておき、この優先順位に基づいてONU20の初期波長を決定する。例えば、下り方向では波長λ11(基底波長)の優先順位が最も高いとし、順にλ12,λ13,λ14と優先順位を設定する。下り方向でも同様にλ21(基底波長)から順に優先順位が高いものとする。ディスカバリー処理等が完了し新たに登録されたONU20をまずは下り基底波長λ11/上り基底波長λ21を初期波長とする。ONU20が新たに登録されるごとに同様の動作を実施し、下り基底波長λ11/上り基底波長λ21を使用するONU20の数が、最大収容ONU数に到達したら、新たに登録されるONU20は次の優先順位の下り波長λ12/上り波長λ22に設定する。このようにONU20の初期波長を決定することにより、通信を行うONU20が少ない場合には、一部の波長を使用しなくてもよく、使用しない波長に関連する光送受信器を停止させることにより、省電力化が可能となる。
OLT10は、ONU20とのトラフィック量を監視し、波長ごとの使用率を算出しておく。ディスカバリー処理等が完了し、あらたにONU20が登録された場合、使用率の低い波長をこのONU20の初期波長に決定する。使用率の低い波長を優先的に用いることにより、各ユーザにより効率的に帯域を割り当てることが可能となる。
OLT10は、PONシステムにおける波長ごとのトラフィック量を監視し、トラフィック量が所定の数値以上となった場合、その波長を使用する特定のONU20に関して使用する波長の変更を決定する。また、波長変更の条件として帯域使用率を用いてもよい。
OLT10は、各波長を使用するONU20の数を監視しておき、特定の波長に収容されるONU20の数が所定数(最大収容ONU数)以上となった場合、その波長を使用する特定のONU20(例えば、新たに追加されたONU)に関して使用する波長の変更を決定する。
(C1)契約等で予め定めた波長
ユーザとの契約等で予め変更する波長を定めておく。
(C2)波長の優先順位に基づいて決定
波長使用優先順位と波長ごとの最大収容ONU数を決めておき、この優先順位に基づいてONU20の初期波長を決定する。
(C3)使用率の低い波長
OLT10は、ONU20とのトラフィック量を監視し、波長ごとの使用率を算出しておく。ONU20の使用波長を変更する場合、使用率の低い波長をこのONU20の初期波長に決定する。
実施の形態1では、OLTが通信システムにおける通信状況等を監視し、ONUの波長を変更することを決定していたが、実施の形態2では、波長変更開始のトリガをONUからの波長変更要請によるものとする場合について示す。実施の形態2に係る通信システムの構成は実施の形態1に示す場合と同様であり、図1に示す通りである。
上述の実施の形態では、親局装置が子局装置の波長切替動作が完了したかを推測し、切替完了を通知する構成としたが、実施の形態3に係る通信システムではHoldover状態終了通知を子局装置から親局装置に対して行う場合について示す。実施の形態3に係る通信システムを、実施の形態1、2と同様にPONシステムを例にとり説明する。その構成は実施の形態1の場合と同様であり、図1に示す通りである。
Claims (21)
- 親局装置と複数の子局装置が光伝送路を介して接続され、下り方向および上り方向の少なくとも一方の通信を複数の波長を用いて行う通信システムであって、
前記親局装置は、
前記子局装置に前記通信において用いる波長を割り当て、割り当てた波長を前記子局装置に通知する制御信号を生成する制御部と、
前記制御部により生成された制御信号を前記子局装置に送信する光送信器と、
を備え、
前記子局装置は、
前記親局装置より受信した制御信号に基づく波長を用いて前記親局装置との通信を行う光送受信器、
を備えること、
を特徴とする通信システム。 - 前記制御部は、予め定められた条件を満たした場合、特定の子局装置において使用する波長の変更を決定し、当該子局装置に使用する波長の変更を通知する制御信号を生成し、
前記光送信器は、前記制御部が生成した波長の変更を通知する制御信号を当該子局装置に送信すること、
を特徴とする請求項1に記載の通信システム。 - 前記子局装置の光送受信器は、自装置の使用可能な波長に関する情報を含む制御信号を前記親局装置に送信し、
前記親局装置の制御部は、前記子局装置の光送受信器により送信された制御信号に含まれる情報に基づいて当該子局装置が使用する波長を割り当てること、
を特徴とする請求項1または2のいずれかに記載の通信システム。 - 前記子局装置の光送受信器は、自装置の波長の切替に要する切替時間に関する情報を含む制御信号を前記親局装置に送信し、
前記親局装置の制御部は、前記子局装置の光送受信器により送信された制御信号に含まれる情報に基づいて当該子局装置の使用波長の切替の完了を推定すること、
を特徴とする請求項1~3のいずれか1項に記載の通信システム。 - 親局装置と複数の子局装置が光伝送路を介して接続され、上り方向および下り方向の少なくとも一方の通信を複数の波長を用いて行う通信システムに適用可能な親局装置であって、
前記子局装置に前記通信において使用する波長を割り当て、割り当てられた波長を当該子局装置に通知する制御信号を生成する制御部と、
前記制御部により生成された制御信号を当該子局装置に送信する光送信器と、
を備えることを特徴とする親局装置。 - 前記制御部は、予め定められた条件を満たした場合、特定の子局装置において使用する波長の変更を決定し、使用波長の変更を当該子局装置に通知する制御信号を生成し、
前記光送信器は、前記制御部が生成した使用波長の変更を通知する制御信号を当該子局装置に送信すること、
を特徴とする請求項5に記載の親局装置。 - 前記制御部は、前記複数の子局装置との通信における波長ごとのトラフィック量を監視し、その監視結果に基づいて特定の子局装置において使用する波長の変更を決定すること、
を特徴とする請求項6に記載の親局装置。 - 前記制御部は、前記複数の子局装置との通信における波長ごとに使用する前記子局装置の数を監視し、監視結果に基づいて特定の子局装置において使用する波長の変更を決定すること、
を特徴とする請求項6に記載の親局装置。 - 前記制御部は、前記子局装置から送信される波長変更要求信号に基づいて、当該子局装置において使用する波長の変更を決定すること、
を特徴とする請求項6に記載の親局装置。 - 前記制御部は、前記複数の波長に優先順位を設定しておき、前記優先順位に基づいて前記子局装置が使用する波長を決定すること、
を特徴とする請求項5~9のいずれか1項に記載の親局装置。 - 前記制御部は、前記複数の波長ごとの帯域使用率を監視し、その監視結果に基づいて前記子局装置が使用する波長を決定すること、
を特徴とする請求項5~9のいずれか1項に記載の親局装置。 - 前記制御部は、前記子局装置が使用可能な波長に関する情報を通知するよう当該子局装置に要求する制御信号を生成するとともに、当該子局装置から受信する通知に基づいて、当該子局装置に割り当てる波長を決定し、
前記光送信器は、前記制御部が生成した制御信号を当該子局装置に送信すること、
を特徴とする請求項5~9のいずれか1項に記載の親局装置。 - 前記制御部は、予め定められた第1の波長を用いて、前記子局装置を登録するディスカバリ処理を行うこと、
を特徴とする請求項5~12のいずれか1項に記載の親局装置。 - 前記制御部は、前記子局装置から受信した当該子局装置が使用する波長の切替時間に関する情報を含む制御信号に基づいて、当該子局装置の切替完了時間を推定し、
前記光送信器は、推定した前記切替完了時間に基づいて、当該子局装置に切替完了通知を送信すること、
を特徴とする請求項5~13記載の親局装置。 - 前記制御部は、前記子局装置から受信した当該子局装置からの切替動作終了の通知に基づいて当該子局装置の切替動作終了を検知し、
前記光送信器は、前記制御部が切替動作終了を検知した子局装置に切替完了通知を送信すること、
を特徴とする請求項5~13記載の親局装置。 - 親局装置と複数の子局装置が光伝送路を介して接続され、下り方向および上り方向の少なくとも一方の通信を複数の波長を用いて行う通信システムに適用可能な子局装置であって、
前記親局装置により自装置に割り当てられた波長に関する情報を含む制御信号を前記親局装置から受信し、受信した制御信号に基づく波長を用いて前記親局装置との通信を行う光送受信器、
を備えることを特徴とする子局装置。 - 前記光送受信器は、自装置が使用可能な波長に関する情報を含む制御信号を前記親局装置に送信すること、
を特徴とする請求項16に記載の子局装置。 - 前記子局装置は、自装置が使用する波長の変更を要求する波長変更要求信号を生成する子局側制御部、を備え、
前記光送受信器は、前記子局側制御部により生成された波長変更要求信号を前記親局装置に送信すること、
を特徴とする請求項16または17のいずれかに記載の子局装置。 - 親局装置と複数の子局装置が光伝送路を介して接続され、上り方向および下り方向の少なくとも一方の通信を複数の波長を用いて行う通信システムの親局装置に適用可能な制御装置であって、
前記子局装置に前記通信において使用する波長を割り当て、割り当てた波長を当該子局装置に通知する制御信号を生成すること、
を特徴とする制御装置。 - 親局装置と複数の子局装置が光伝送路を介して接続され、上り方向および下り方向の少なくとも一方の通信を複数の波長を用いて行う通信システムの子局装置に適用可能な制御装置であって、
前記親局装置から受信した、前記親局装置により前記子局装置に割り当てられた波長に関する情報を含む制御信号に基づく波長を使用可能なように当該子局装置の光送受信器を制御すること、
を特徴とする制御装置。 - 親局装置と複数の子局装置が光伝送路を介して接続され、前記子局装置は前記親局装置と送信または受信の少なくとも一方を複数の波長を用いて行う通信システムに適用可能な通信制御方法であって、
前記親局装置が、前記子局装置に前記通信において用いる波長を割り当て、割り当てた波長を前記子局装置に通知する通知ステップと、
前記通知ステップにおいて前記親局装置から通知された波長に基づいて、前記子局装置が前記親局装置とのデータの送信または受信を行うデータ送受信ステップと、
を備えることを特徴とする通信制御方法。
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