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    • 专利摘要:
    optical communication system, station-side optical line termination apparatus, communication method for a communication system, and, control apparatus for an optical line termination apparatus. This invention provides an optical communication system in which a plurality of user-side optical circuit determining apparatus (each of which will be referred to as "un" hereinafter) is connected to a user-side optical circuit terminating apparatus. of the station (which will be referred to as "olt" hereinafter) through the use of a common optical fiber. at least some of the plurality of charges each comprises: a transceiver having a power-saving function for suspending operation of a unit transmission, while supplying power to the receiving unit; and an operative controller for transmitting energy saving function equipment information to the olt via the transceiver. enabled upstream communication equipment and an operative transceiver to receive the information from the energy saving function equipment and transmit the transmission information mission allowed for the un.
    公开号:BR112012002126B1
    申请号:R112012002126-5
    申请日:2011-04-12
    公开日:2022-01-11
    发明作者:Hiroaki Mukai；Masaki Tanaka；Daisuke Ito
    申请人:Mitsubishi Electric Corporation；
    IPC主号:
    专利说明:

    Field
    [001] The present invention relates to a communication system in which a plurality of terminals are connected via a common line and a communication method and relates to, for example, a PON (Passive Optical Network) system including a OLT (Optical Line Terminal: a station-side terminating apparatus) and a plurality of ONUs (Optical Network Units: user-side terminating apparatus). Fundamentals
    [002] In the PON system, the OLT and ONUs communicate in synchronization with each other to prevent data in one upstream direction transmitted from the ONUs from colliding with each other. The OLT plans to provide transmit permission to ONUs to prevent data in the upstream direction from colliding with each other. In planning, the OLT takes into account delays due to the distances between the OLT and the ONUs. Therefore, the OLT measures round-trip time between the OLT and ONUs. However, because there is fluctuation in a transmission line such as delay variation and loss variation in transmission over an optical fiber, it is necessary to periodically perform the measurement.
    [003] On the other hand, data communication is not always performed. Data communication is not carried out completely, for example at night. However, the measurement of round-trip times is carried out periodically regardless of the presence or absence of data communication as explained above. ONUs are always configured in a communicable state for the measurement of round-trip times even if data communication is not performed. This leads to a waste of electrical energy. Therefore, the technology to intermittently shift the ONUs to a power-saving state by requesting a shift to the power-saving state from the ONUs is considered.
    [004] A PON system which, when there is no upstream data from a ONU, does not needlessly allocate transmission bandwidth to such a ONU and improves transmission capacity is considered (Patent Literature 1). In this PON system, when an OLT detects a state in which there is no user data for a fixed period configured in advance, the OLT deregisters an ONU and notifies the ONU that an optical link is temporarily stopped. Thereafter, no transmission bandwidth is allocated to the ONU and transmission of a frame to maintain a link is suppressed. Therefore, the ONU can reduce the number of times the frame is transmitted. citation list Patent Literature
    [005] Patent Literature 1: Open-ended Japanese Patent Application No. 2007-274534 summary Technical problem
    [006] In the PON system described in Patent Literature 1, because a link to an ONU that does not transmit data for a fixed period is disconnected, a load on the ONU can be reduced. However, when the ONU resumes transmitting upstream data, the OLT performs discovery processing again to discover an unconnected ONU, establishes a link again, and re-registers the ONU. Therefore, there is a problem in the fact that, for example, when communication at a low bit rate continues, this communication method cannot be used. Solution to the problem
    [007] In order to solve the aforementioned problems, an optical communication system that connects a plurality of user-side optical line termination apparatus (hereinafter referred to as ONUs) to a user-side optical line termination apparatus station (hereinafter referred to as OLT) using a common optical fiber according to an aspect of the present invention is constructed such that the ONU as at least a part of the ONUs includes a transceiver having a power saving function for deactivating a unit transmission while supplying electrical power to a receiving unit and a control apparatus which transmits information supporting the energy saving function to the OLT via the transceiver, and the OLT includes a control apparatus which generates transmission permission information upstream communication based on energy saving function support information and a transceiver receiving echo function support information energy saving and transmits the transmission permission information to the ONU.
    [008] A station-side optical line termination apparatus according to another aspect of the present invention is constructed in such a manner as to include a control apparatus that receives information supporting a power-saving function of the apparatus. user-side optical line termination device and selects, based on this support information, a power-saving protocol used for communication with user-side optical line-terminating apparatus from a plurality of power-saving protocols having different communication procedures.
    [009] A user-side optical line termination apparatus according to another aspect of the present invention is constructed in such a manner as to include: an optical transceiver connected to optical fiber and including a power saving function to make inactivates transmission while continuing reception; and a control apparatus which transmits information supporting the energy saving function to the station-side optical line termination apparatus and controls, on the basis of the tuning information received in advance from the side optical line termination apparatus of the station, the property of a shift to a power-saving mode of the optical transceiver.
    [0010] A communication method according to a further aspect of the present invention is constructed in such a manner as to include: the master station apparatus detecting a power-saving function of the slave station apparatus; the master station apparatus determining a power-saving protocol based on the detected power-saving function of the slave station apparatus; and the master station apparatus controlling, using the determined energy-saving protocol, the intermittent supply of transmitter power or slave station apparatus receiver power.
    [0011] The communication method as described above in accordance with a further aspect of the present invention is constructed in such a manner as to further include a step in which the master station apparatus transmits a signal to set a power supply hang time from the transmitter or receiver power from the slave station device to the slave station device. Advantageous Effects of the Invention
    [0012] The communication method, an optical communication system, the station-side optical line termination apparatus, the user-side optical line termination apparatus, and the control apparatus according to the present invention may reduce power consumption while continuing intermittent communication. Brief Description of Drawings
    [0013] FIG. 1 is a diagram of the configuration of a communication system in an embodiment of the present invention.
    [0014] FIG. 2 is a sequence graph for explaining a method of communication in a first embodiment of the present invention.
    [0015] FIG. 3 is a sequence graph for explaining a method of communicating in a power-saving mode in the first embodiment of the present invention.
    [0016] FIG. 4 is a sequence graph to explain setup control and idle Tx and RX mode control in the first embodiment of the present invention.
    [0017] FIG. 5 is a sequence graph to explain a configuration control and the Tx and RX idle mode control in the first embodiment of the present invention.
    [0018] FIG. 6 is a sequence graph for explaining an idle TX and RX mode protocol in the first embodiment of the present invention.
    [0019] FIG. 7 is a sequence graph to explain another example of the TX and RX idle mode protocol in the first embodiment of the present invention.
    [0020] FIG. 8 is a flowchart for explaining setup processing and the like of a control apparatus in a second embodiment of the present invention.
    [0021] FIG. 9 is a flowchart for explaining an idle TX and RX mode control and the like of the control apparatus in the second embodiment of the present invention.
    [0022] FIG. 10 is a flowchart for explaining idle TX and RX mode request processing and the like of the control apparatus in the second embodiment of the present invention.
    [0023] FIG. 11 is a table of ONUs and service data in the second embodiment of the present invention.
    [0024] FIG. 12 is a table of a service and a power-saving mode prohibited in the second embodiment of the present invention.
    [0025] FIG. 13 is a table of a service and a power saving mode prohibited in the second embodiment of the present invention.
    [0026] FIG. 14 is a table of a service and maximum idle TX and RX time in the second embodiment of the present invention.
    [0027] FIG. 15 is a table of a service and data of a default idle TX and RX time in the second embodiment of the present invention. Description of Modalities first modality hardware configuration
    [0028] FIG. 1 is a diagram of an example configuration of a PON system in accordance with the first embodiment of the present invention. As shown in Fig. 1, the PON system according to this embodiment includes an OLT 1 (a master station apparatus) and ONUs 10-1 to 10-3 (slave station apparatus). OLT 1 and ONUs 10-1 to 10-3 are connected via a subscriber line 30 via a splitter 40. Splitter 40 divides the subscriber line 30 connected to OLT 1 into the number of ONUs 10-1 to 10- 3. ONU 10-1 is connected to terminals 20-1 and 20-2. In an example explained here, three ONUs are provided. However, the number of ONUs is not limited to this and can be any number.
    [0029] The OLT 1 includes a PON 2 control unit that performs processing on the OLT side based on a PON protocol, a receive staging memory area, which is a staging area for storing data at received from ONUs 10-1 to 10-3, an optical transceiver 5 that performs transmission and reception processing for an optical signal, a WDM (Wavelength Division Multiplexing) coupler 6 that multiplexes by wavelength the upstream data and downstream data, and a physical layer processing unit (PHY) 7 that performs a physical interface function of an NNI (Network Node Interface) between the OLT 1 and a network. Optical transceiver 5 includes an optical receiver (Rx: Receiver) 51 which performs receive processing and an optical transmitter (Tx: Transmitter) 52 which performs transmit processing.
    [0030] An ONU 10-1 includes a PON control unit 11 that performs processing on an ONU side based on the PON protocol, a transmission staging area (an upstream staging memory area) 12 , which is a staging area for storing transmit data (upstream data) for OLT 1, a receive staging area (a downstream staging memory area) 13, which is a staging area temporary storage for storing receive data (downstream data) from the OLT 1, an optical transceiver 14, a WDM 15 that multiplexes by wavelength the upstream data and the downstream data, and physical layer processing units (PHYs) 16-1 and 16-2 that perform a physical interface function of a UNI (Network User Interface) respectively between an ONU 10-1 and terminals 20-1 and 20-2.
    [0031] Optical transceiver 14 includes an optical transmitter (Tx: Transmitter) 141 that performs transmit processing and an optical receiver (Rx: Receiver) 142 that performs receive processing. The PON control unit 11 is connected to the optical transceiver 14 via a signal line for energy saving control to control either of the optical transmitter 141 and the optical receiver 142 or both to be an ON state and an ON state. OFF. In the communication system according to this embodiment, (1) an ONU 10 that can control only the transmitter 141 for a power saving mode, (2) an ONU 10 that can control the transmitter 141 and the receiver 142 for the state of power saver, (3) and an ONU 10 that cannot handle control of the power save state of transmitter 141 and receiver 142, are mixed. The PHY 16-1 includes a receive unit (Rx: Receiver) 161-1 that performs receive processing and a transmit unit (Tx: Transmitter) 162-1 that performs transmit processing. The PHY 16-2 includes a receive unit (Rx: Receiver) 161-2 that performs receive processing and a transmit unit (Tx: Transmitter) 162-2 that performs transmit processing.
    [0032] Two terminals are connected to ONU 10-1. However, the number of terminals is not limited to this and can be any number. ONU 10-1 includes physical layer processing units (PHYs) corresponding to the number of endpoints. In Fig. 1, the configuration example of an ONU 10-1 is explained as a representative. However, ONUs 10-2 and 10-3 have the same configuration as that of ONU 10-1.
    [0033] Like the PON system in the past, the PON 2 control unit of OLT 1 performs bandwidth allocation for upstream data to provide transmit permission respectively to ONUs 10-1 to 10-3 to prevent frames of transmission time from overlapping each other and prevents collision of transmission data from ONUs 10-1 to 10-3. Any method can be used for this bandwidth allocation. However, for example, the Dynamic Bandwidth Allocation Algorithm described in 'Su-il Choi and Jae-doo, "HuhDynamic BAndwidth Allocation Algorithm for Multimedia Services over Ehternet (registered trademark) PONs", ETRI Journal, Volume 24, Issue 6, December 2002 p. 465 on p. 466'.
    [0034] A general operation of OLT 1 and ONUs 10-1 to 10-3 according to this modality is explained. The PON control unit 2 stores, in a transmission temporary storage area 4, downstream data (downstream communication data) received from a network via the PHY 7. When data is transmitted from the OLT 1, PON control unit 2 reads downstream data stored in transmission buffer area 4 and outputs the data downstream to optical transceiver 5, Tx 52 of optical transceiver 5 outputs transmission data to WDM 6 with a optical signal, and the WDM 6 applies wavelength multiplexing to the optical signal output from the optical transceiver 5 and outputs the optical signal to ONUs 10-1 to 10-3 with a downstream signal through the subscriber line 30 When the PON 2 control unit transmits a control message for allocating transmission bandwidth or the like to transmit an instruction for a transmission permit, the PON 2 control unit outputs the generated control message by the control unit from PON 2 to optical transceiver 5 and thereafter transmits the control message to ONUs 10-1 to 10-3 in the same way as the downstream data. In the PON system shown in Fig. 1, WDMs 6 and 15 are used to perform wavelength multiplexing. However, when communication takes place on a single wavelength, WDMs 6 and 15 are not essential.
    [0035] At ONUs 10-1 to 10-3, when the downstream signal is received from the OLT 1, the WDM 15 separates the downstream signal and sends the downstream signal to the optical transceiver 14 and the Rx 142 of the optical transceiver 14 converts the downstream signal into data downstream of an electrical signal and outputs the downstream data to the PON control unit 11. The PON control unit 11 stores, in the receive buffer 13, the downstream data output from the Rx 142 of the optical transceiver 14. The PON control unit 11 reads the downstream data stored in the receive staging area 13 and outputs the downstream data to both or one of the PHYs 16-1 and 16-2 according to a data destination. The PHYs 16-1 and 16-2 that receive the downstream data perform predetermined processing on the downstream data and transmit the downstream data to the terminals 20-1 and 20-2 to which the PHYs 16-1 and 16-2 are connected.
    [0036] On the other hand, when upstream data is transmitted from ONUs 10-1 to 10-3, the PON control unit 11 stores, in the transmission temporary storage area 12, the upstream data acquired from from terminals 20-1 and 20-2 through PHYs 16-1 and 16-2. The PON control unit 11 reads, based on the transmission bandwidth given from the OLT 1, the transmission data stored in the transmission temporary storage area and outputs the transmission data to the optical transceiver 14. The Tx 141 of optical transceiver 14 converts the upstream data into an optical signal (an upstream signal) and transmits the optical signal to OLT 1 through WDM 15 and subscriber line 30.
    [0037] The PON 2 control unit of the OLT 1 stores, in a temporary reception storage area 3, the upstream data received from ONUs 10-1 to 10-3 through the subscriber line 30, of the WDM 6 , and from the Rx 51 of the optical transceiver 5. The PON control unit 2 reads the upstream data stored in the receive staging area 3 and outputs the upstream data to the network via the PHY 7.
    [0038] In ONUs 10-1 to 10-3, considering the control message from OLT 1, the PON control unit 11 receives the control message through WDM 15 and Rx 142 from optical transceiver 14 and performs , for example, implementing an operation based on a control message instruction and generating a response to the control message. UN adaptive energy saving feature
    [0039] As an example of power-saving operation of a communication system, a power-saving operation of PON system is explained with reference to Fig. 2. In a communication system shown in Fig. 2, an ONU (1) having a power-saving function and an ONU (2) not having a power-saving function are connected to an OLT 1. In Fig. 2, the control on which OLT 1 causes ONU 10 to operate in a power saving state according to the capacity of ONU 10 is shown.
    [0040] First, in step S1, OLT 1 performs discovery processing to find an active ONU 10. OLT 1 broadcasts a control message to discover communication from downstream communication. ONUs 10 that receive this control message return serial numbers and the like of ONUs to OLT 1. Because all ONUs 10 in a communicable state return response messages, OLT 1 can discover an ONU 10 in an active state. In this example, a power supply to an ONU (2) is disconnected and the ONU (2) does not return a response message.
    [0041] Subsequently, OLT 1 exchanges various parameters involving the capacity of ONU 10 and communication conditions with ONU 10 discovered in step S1 and performs condition configuration for communication between OLT 1 and ONU 10 (step S2). ONU 10 transmits information supporting the power saving function from ONU 10 to OLT 1 as a power saving level. This support information includes information on controlling a transceiver's power supply and sleep_time from the power save mode. Power supply control information is, for example, data from any of [1] a sleep mode: the transmit function (Tx) is OFF and the receive function [Rx] is ON, [2] a TX and RX inactive mode (or Cycle TX and RX inactive): the transmit function (Tx) and receive function [Rx] are periodically set to OFF, and [3] not corresponding to energy saving mode or , when the energy saving function corresponds to a plurality of modes, given in which those modes are listed.
    [0042] When a configuration ends, OLT 1 moves to a normal communication state. The OLT 1 allocates bandwidth for upstream communication to the ONUs 10 and transmits the bandwidths to the ONUs 10 as transmission permission (Grant or Pass) information. The OLT 1 can store this Lease in a frame along with other data and transmit the Lease to ONUs 10 or it may individually transmit the Lease.
    [0043] ONU 10 that receives the Grant initiates data transmission. However, in the following explanation, there is no transmission data and ONU 10 shifts to power save mode (step S3). When ONU 10 moves into power save mode, ONU 10 transmits a request signal to OLT 1. OLT 1 determines, based on, for example, the various types of information from ONU 10 acquired in step S2 and a state of upstream and downstream communication with ONU 10, if shift to power save mode is allowed, and transmits a permit signal (a disallow signal) to ONU 10. When ONU 10 receives the permit signal, ONU 10 turns off a power supply to transmit unit 141 (or transmit unit 141 and receive unit 142) and reduces electrical power consumption by optical transceiver 14.
    [0044] According to a configuration result in step S2, OLT 1 could allow a power saving mode different from the power saving mode requested by ONU 10, change time setting to temporarily turn off the power supply to the transmitter 141 or the like during power saving, and notify ONU 10 of enabling power saving mode and configuration change.
    [0045] In step S3, OLT 1 allocates Lease to ONU 10 also in power save mode. This is for the purpose of enabling ONU 10 to transmit data with a short delay when upstream data is generated at ONU 10. OLT 1 may allocate this Lease each time involving bandwidth update periods or it may allocate the Lease in an interval of once in several times taking into account the fact that upstream communication is not carried out frequently. For example, it is conceivable to allocate Lease all the time in sleep mode and allocate Lease at a reduced interval in idle TX and RX mode.
    [0046] Even during power save mode, OLT 1 and ONU 10 continue to communicate. This state is shown in Fig. 3. ONU 10 enters power save mode at time U3. However, in twelve mode, ONU 10 receives downstream data along with the Grant. On the other hand, considering upstream communication, ONU 10 temporarily turns on the power supply to transmitter 141 at time U6 after expiry of a predetermined time (TX and RX idle time), transmits a request (a request idle), and maintains a link. Thereafter, ONU 10 shuts off power supply to transmitter 141 again. When transmitter 141 is temporarily in the ON state, ONU 10 may also transmit other control information and small data in the allocated bandwidth. Considering control to use the energy saving function while maintaining a link, the applicant explains the control in PCT / JP2010 / 002054. This application is cited and included in this application.
    [0047] Referring back to Fig. 2, the explanation of energy saving control based on ONU 10 capacity is continued. ONU 10 monitors upstream data generation equal to or greater than a predetermined threshold and the start of communication from a terminal (a connected device) that requests a large bandwidth. ONU 10 determines to release the energy saving mode based on a result of this monitoring. ONU 10 performs this release by transmitting a release message or transmitting data.
    [0048] Control performed when ONU (2) not having a power-saving function and not supporting a power-saving protocol is started is explained. When ONU (2) is discovered by periodic discovery of OLT 1 (step S4) and the configuration (step S5) ends, ONU (2) initiates communication. When OLT 1 transmits Grant to ONU (1) and ONU (2) as usual, ONU (2) transmits a Hold Frame as a response even when there is no upstream data. ONU (2) transmits the Standby Frame because when the Standby Frame is not transmitted, LOSi (Loss of Signal for ONUs i) is detected and a link is disconnected. However, it is a waste of ONU 10 power consumption and bandwidth to transmit the frame even though there is no transmit data.
    [0049] Therefore, when the OLT 1 determines, based on the configuration result, that the ONU (2) operates for a long time (equal to or greater than a predetermined threshold) in such a state, the OLT 1 determines to cause the ONU (2) to operate substantially in the energy-saving state (step S7a). In the example shown in Fig. 2, because a request for power saving mode is received from ONU (1), OLT 1 starts, based on the configuration result, communication with ONU (1) supporting the mode. power saver in eg a sleep mode power save protocol and with ONU (2) not supporting power save mode in a power save protocol via a pseudo sleep mode.
    [0050] Pseudo Sleep Mode Power Saving Protocol is a protocol in which a Lease transmission interval is set to, for example, once every ten periods and a bandwidth refresh period and the Lease is restricted from that before a shift to pseudo sleep mode. Consequently, because the Standby Frame transmission decreases, electrical energy consumed for upstream communication can be saved. In pseudo sleep mode, when ONU 10 is given a Grant, ONU 10 definitely returns a response.
    [0051] On the other hand, the sleep mode power-saving protocol rule specifies that even if ONU 10 is given Grant, it is unnecessary to return a response when there is no transmission data. Instead of a response returned every time, to detect failure in a communication path, ONU 10 returns a response frame at least once in a configured period of TX and RX idle time. In Rest Mode, the Grant is given more often than in Pseudo Rest Mode. C2 in Fig. 2 indicates an interval of the Grant given in pseudo sleep mode. It is seen that this C2 interval is longer than a given C1 interval in sleep mode and therefore a transmission interval of the Standby Frame is long and power consumption of ONU (2) is suppressed.
    [0052] The sleep mode power-saving protocol has a feature that transmission of a response frame can be suppressed and a transmission delay during the occurrence of upstream communication can be eliminated or reduced according to a short interval of time. transmission of the Concession.
    [0053] As explained above, in the communication system according to this mode, it is possible to change the energy saving protocol based on the support information of the energy saving function and suppress power consumption according to the characteristics of the respective ONUs . This communication system can apply control to suppress power consumption for ONU 10 not having power saving function and not supporting power saving protocol such as ONU (2). Configuration details and selection of a power saving mode
    [0054] Configuration details are explained with reference to Fig. 4. In Fig. 4, the same reference signals as those in Fig. 2 denote the same or equivalent processing. Step S5 indicates details of the setup operation shown in Fig. 2.
    [0055] ONU 10 collects information regarding attributes including a type of a connected device such as terminal 20-1, ON/OFF, a type of a line, and speed (step S5a) and combines the information with information regarding a function and performance of the apparatus itself recorded on a storage device of the apparatus itself to generate attribute information (step S5b). ONU 10 saves the support information (power_save_attr) of the power save function as this attribute information.
    [0056] When discovery ends, for configuration, OLT 1 transmits a request command (Get_cmd) to ONU 10 attribute information. ONU 10 returns attribute information in response frames (Get_rsp) in response to this command of request. In some case, ONU (2) not supporting power-saving function does not transmit support information (power_save_attr) of power-saving function.
    [0057] When OLT 1 receives response frames (Get_rsp), OLT 1 stores response frames in a recording device (a database) of itself in a format shown in Fig. 11 explained later. Similarly, OLT 1 checks, based on a contract for each user recorded on the recording device in advance, limitations of a power saving mode for each user and each service provided (step S5c) and determines power saving modes allowed for ONUs 10 and conditions for permission (step S5d). Examples of limitations are shown in Figs. 11 to 15. For example, when the user uses a communication line to a server requested to respond quickly, it is undesirable for ONU 10 to shift to power save mode and a delay occurs. The OLT 1 and ONU 10 can suppress such an undesirable delay in advance by checking the allowed power saving mode in advance.
    [0058] Subsequently, OLT 1 transmits the given energy saving mode enabling using a command frame (Set_cmd). ONU 10 writes the received energy saving mode allowed to the device's own storage device (step S5e).
    [0059] ONU 10 determines, based on the recorded allowable power save mode, an in-use power save mode and ownership of an offset to the power save mode. On shifting to sleep mode, ONU 10 transmits the request (sleep_mode_req) along with the requested sleep mode parameters as explained above. The OLT 1 that receives the request detects a state (presence or absence and an upstream) of upstream or downstream communication traffic, a type of a link, and a connected device (a type, ON/OFF, etc.) side of ONU 10 and selects a power saving mode based on the information considering the requested power saving mode, the detection result, and the allowed power saving mode. OLT 1 returns a selection result to ONU 10 using a response frame (sleep_mode_ack).
    [0060] OLT 1 monitors traffic from ONU (2) not also having power save mode and determines whether ONU (2) should shift to power save mode. Therefore, even if ONU (2) does not transmit a request, OLT 1 can drive ONU (2) to a substantial power-saving state. Selection of different energy saving mode
    [0061] Processing for selecting different types of energy saving protocols for a plurality of ONUs 10 having the energy saving function according to characteristics of ONUs 10 is explained. In Fig. 5, same reference signals as those in Fig. 4 denote the same or equivalent processing. ONU (1) has only power saving function corresponding to sleep mode. ONU (3) has power saving function corresponding to sleep mode and idle TX and RX mode. In other words, the ONU (1) can turn off the power supply to only the transmitter 141 but the ONU (3) can independently control the power supplies to the transmitter 141 and to the receiver 142.
    [0062] It is assumed that after the configuration is finished and communication is started, both ONUs are in a situation where the ONUs can shift to power saving mode; for example, the situation in which only intermittent and small amount of data communication via web browsing or sound communication in a small bandwidth occurs, or in which a power supply to only one IP phone is ON and in a waiting state. ONU 10 detects these traffic situations by monitoring a transmission temporary storage area and monitoring status for a connected device. When the situations respectively satisfy preconfigured conditions, ONU 10 determines a shift to energy saving mode. For example, when a total amount or an average of upstream traffic and downstream traffic in a predetermined period falls below a threshold, ONU 10 makes a determination of an offset according to a state of a connected device. , a comparison table of power saving modes to which ONU 10 can move, and the like (steps S6a and S6b).
    [0063] In step S6c, ONU 10 verifies, by accessing the storage device, if the energy saving mode determined from the traffic state and the like corresponds to the energy saving mode allowed by OLT 1. power saving mode is the allowed mode, ONU 10 transmits the request (sleep_mode_req) to OLT 1. At this point, when the given mode does not match the allowed mode, ONU 10 switches the mode to a mode corresponding to the allowed mode or suppress transmission of the request. ONU 10 can save the useless consumption of bandwidth and electrical energy required for processing by suppressing the request not matching the allowed mode.
    [0064] OLT 1 receives requests from ONUs 10 and determines whether requests can be allowed or determines power-saving modes adapted to the attribute information of ONUs 10 (step S7a) and returns power-saving modes to the ONUs 10. ONUs 10. For example, even when the request to shift to sleep mode is received from ONU (3), when OLT 1 determines that there is no downstream communication, OLT 1 can change mode to shift to TX and RX idle mode and can return a response frame to ONU (3) supporting TX and RX idle mode. On the other hand, because it is known that ONU (1) only supports sleep mode, even in the same situation, OLT 1 does not perform a switch to TX and RX idle mode, and as requested from ONU (1 ), returns a response frame designating sleep mode.
    [0065] According to the processing explained above, henceforth, ONU (1) operates in sleep mode and ONU (3) operates in TX and RX idle mode.
    [0066] It is also possible to make the request from ONU 10 in a form not designating a way to save energy. In this case, OLT 1 selects a power saving mode based on the supporting information and the attribute information of ONU 10 obtained by configuration and notifies ONU 10 of the power saving mode. Mode switching between power saving modes
    [0067] A mode switch between power saving modes is explained with reference to Fig. 6. In Fig. 6, the same reference signals as those in Fig. 2 denote the same or equivalent processing. This protocol is an example. The present invention is not limited to the various transmission frames, transmission frame names, and procedures shown in Fig. 6.
    [0068] In Fig. 6, a state in which ONU 10 shifts from sleep mode to TX and RX idle mode and thereafter shifts to sleep mode again is shown. The ONU 10 could spontaneously perform, based on the determination of the ONU 10 explained in steps S6a to S6c in Fig. 5, this mode switching between a plurality of energy saving modes. However, OLT 1 can also instruct a mode to shift. The one-mode shift instruction by OLT 1 is explained as an example below.
    [0069] ONU 10 operating in a P1 period designates sleep mode and transmits the request (sleep_mode_req) and moves to sleep mode in a P2 period. After shifting to sleep mode, ONU 10 maintains power supply to receiver 142 and, on the other hand, cuts power supply to transmitter 141 and starts operation with suppressed power consumption. In Fig. 6, Tx and Rx respectively indicate transmitter 141 and receiver 142 power-on states (periods without Tx or Rx description indicate a power-off state).
    [0070] In period P2, because receiver 142 is in an ON state, OLT 1 can transmit data downstream. Although not shown in the figure, OLT 1 gives Grant to ONU 10 along with the downstream data. UN 10 receives the Concession. However, when there is no transmission data, ONU 10 does not supply electrical power to transmitter 141 and suppresses power consumption.
    [0071] When downstream traffic transmitted from OLT 1 to ONU 10 ends at step S10, OLT 1 detects the end of downstream traffic from a monitoring result of transmission staging area 4 and similarly, checks a configuration result in step S2 stored in the storage device, and determines whether downstream communication is also configured in a power-saving mode. End of downstream traffic detection is performed according to, for example, whether downstream traffic in a fixed period decreases to equal or less than a predetermined threshold.
    [0072] When OLT 1 determines to effect a change from sleep mode to TX and RX sleep mode, OLT 1 transmits a TX and RX sleep mode change instruction (sleep_mode_Ind) with a designated mode (SLEEP ) to ONU 10. ONU 10 that receives this change instruction transmits sleep_mode_req as in shift to normal power save mode. When sleep_mode_ack is returned from OLT 1, ONU 10 switches a power saving mode from sleep mode to TX and RX sleep mode. The ONU 10 cuts off the power supply to the receiver 142 and operates in a state in which power consumption is still suppressed.
    [0073] In TX and RX idle mode, ONU 10 repeats power off and power on in a fixed or variable period called TX and RX idle cycle. A period for which the power supply is turned off is designated by a parameter called the TX and RX idle time. The “TX and RX idle time” can be a default value determined by the configuration or it can be a value assigned by sleep_mode_ack(sleep_mode_req). For example, when “TX and RX idle time” is not designated by sleep_mode_ack(sleep_mode_req), ONU 10 and OLT 1 use the default value.
    [0074] ONU 10 temporarily turns on the power supplies to transmitter 141 and receiver 142 according to “TX and RX idle time” and notifies OLT 1 as to whether TX and RX idle mode is continued (sleep_mode_req). OLT 1 can confirm by receiving sleep_mode_req that a line fault has not occurred between OLT 1 and ONU 10. OLT 1 returns sleep_mode_ack in response to sleep_mode_req. At this point, OLT 1 can simultaneously also transmit a small amount of data downstream. The OLT 1 can also adjust the TX and RX idle time according to data accumulation information from the transmission buffer memory area, an increase or decrease in data accumulation information and the like, and transmit sleep_mode_ack to the ONU 10 (an option function). For example, when an amount of data backlog from the transmission staging area increases, OLT 1 changes the TX and RX idle time to be short. When the amount of data accumulation decreases or a state in which no data exists for a fixed period, OLT 1 changes the TX and RX idle time to be long.
    [0075] In the following, occurrence or an increase in downstream traffic during TX and RX idle mode is explained. When the traffic situation changes, new communication occurs, or the like by monitoring the transmission staging area is detected, OLT 1 determines whether the idle TX and RX mode is changed (step S11). When OLT 1 changes the mode from TX and RX idle, OLT 1 transmits a change request (sleep_mode_Ind) to ONU 10. At this point, when OLT 1 determines that traffic increases only in the downstream communication, the OLT 1 can instruct ONU 10 to switch from idle TX and RX mode to sleep mode. This instruction has the effect that it is possible to reduce electrical energy consumed by ONU 10 compared to electrical energy consumed when ONU 10 moves from TX and RX idle mode to a full service mode (in which both Tx and Rx are both in ON state).
    [0076] OLT 1 can designate the TX and RX idle time in the change request (sleep_mode_Ind). In the example shown in Fig. 6, the three messages sleep_mode_Ind, sleep_mode_req, and sleep_mode_ack are used to change the mode between sleep mode and TX and RX idle mode. However, as shown in Fig. 7, a mode can also be changed according to sleep_mode_Ind and sleep_mode_ack messages. Second mode.
    [0077] FIG. 8 is a flowchart to explain PON 2 control unit processing in OLT 1 according to the second embodiment. The PON 2 control unit according to the second modality is applicable to the communication system according to the first modality. The entire communication system is the same as that in the first mode.
    [0078] The PON 2 control unit is a control device used by a master machine such as the OLT 1 and includes a combination of a digital signal processor, a general purpose processor, and software. These processors are integrated on a chip through a highly integrated IC (Integrated Circuit) and coupled and combined with optical transceiver 5 and the like through a signal line to thereby function as the OLT 1.
    [0079] First, PON control unit 2 initiates discovery via optical transceiver 5. Because a serial number of ONU 10 is obtained in discovery, PON control unit 2 accesses, based on the serial number, an storage built into or externally connected or connected to ONU 10 and specifies a user using ONU 10. The PON control unit 2 performs user association and a service having a contact with the user (step S50). For example, an example of association is shown in Fig. 11. The PON control unit 2 associates a ONU serial number and service information considering a user ID and whether the user has a contract for business use or a general contract for a user in a single house. Associated information includes information such as information regarding types of service lines (an IPTV, an IP phone, the Internet, etc.). On these service lines, request for service (QoS) conditions such as guaranteed bandwidth, allowable delays, and the like of upstream and downstream flow are different depending on the types. Settings
    [0080] Subsequently, PON control unit 2 starts configuring ONU 10 equivalent to step S2 in Fig. 2. To request ONUs 10 for support information (power_save_attr) of power saving function, control unit PON 2 generates a request message (Get_cmd) and transmits the request message to ONUs 10 (step S51). At this point, the PON control unit 2 can also request attribute information from the other ONUs 10. The attribute information from ONU 10 is information specified in, for example, ITU-G.984.4 ONT control and management interface. T. An ONU 10 configuration method can be performed in the same manner as that specified ITU-T G.984.4 ONT control and management interface. Attribute information can be acquired using information and a method same as equivalent standards such as a next generation XG-PON standard to be established in the future.
    [0081] The PON control unit 2 acquires, from the temporary storage area or from the transceiver 5, OCi support information received by the transceiver from the ONUs i (step S52). The PON control unit 2 compares the serial number of the active ONU 10 specified by discovery and serial numbers of the ONUs 10 that transmit the OCi support information to thereby specifies the ONU 10 not having the OCi support information of the OCi function. energy saving as ONU 10 not having the energy saving function (step S53). Even when ONU 10 transmits, using a Get_rsp message, the OCi support information indicating that ONU 10 does not support the power saving function, the PON control unit 2 also specifies ONU 10 with ONU 10 not having the energy saving function.
    [0082] The PON control unit 2 writes the support information to, for example, an embedded storage device in association with ONU 10 in a manner shown in Fig. 11 (step S54). The supporting information acquired by the PON 2 control unit includes not only a power saving mode but also various parameters regarding the power saving function such as TX and RX idle time. Therefore, although not shown in Fig. 11, the PON control unit 2 also writes those various parameters to the storage device.
    [0083] The PON 2 control unit accesses a service database (a storage device) shown in Figs. 11 to 15 and determines power saving modes allowed for N ONUs i and power saving parameters (steps S5c and S5d). This determination can be carried out according to, for example, a method explained below.
    [0084] The PON control unit 2 reads, based on the user identifiers (IDs) associated with ONUs i, a service ID with which the user has a contract from the storage device (see FIG. 11). ) and specific, from the information tables respectively shown in Figs. 12 and 13, Fi power-saving modes prohibited considering the respective service IDs. At this point, prohibited modes for ONUs i can be determined by any algorithm. However, when "deprecated" is set to a power saving mode in Fig. 12 or FIG. 13, the PON 2 control unit sets the power saving mode to a prohibited mode.
    [0085] The PON 2 control unit specifies power-saving modes of the ONUs themselves ia from an information table table shown in Fig. 11 and excludes the power-saving modes Fi from the designated power-saving modes in Fig. information table to thereby determine AMi power saving modes to be allowed. Allowed Ami power saving modes are stored on the storage device.
    [0086] The PON 2 control unit stores a default DefPSTi time value in the storage device (FIG. 15). The default value DefPSTi is one of the parameters considering the energy saving function and acquired from ONU 10. The PON control unit 2 can adjust this default value DefPSTi using a regulation value or a default value configured in advance according to a service in the same way as setting a power saving mode based on a service. For example, when a default value of the TX and RX Idle Time notified by ONU 10 is excessively long, upstream communication communication quality deteriorates or downstream traffic presses a storage area from an OLT receive staging area. 1. Therefore, the PON 2 control unit adjusts the idle time of TX and RX. Similarly, the PON 2 control unit also stores a MaxPSTi maximum idle TX and RX time in the storage device (see FIG. 14). This maximum idle TX and RX time is a setting value in dynamically adjusting the idle TX and RX time. The PON 2 control unit can use MaxPSTi as a determining condition for an alarm such as LOSi.
    [0087] It is advisable that the OLT 1 stores, according to the tables shown in Figs. 14 and 15, two types of tables: the table stored by OLT 1 in advance and the table determined as a result of a negotiation with ONU 10.
    [0088] When Ami allowed modes, DefPSTi default TX and RX idle time, and MaxPSTi maximum TX and RX idle time considering a power saving mode are determined for ONUs 10, PON 2 control unit notifies ONU 10 of these parameters using a message (Set_cmd). After receiving Set_cmd, ONU 10 writes these parameters to ONU 10's storage device and uses the parameters to control an inactive TX and RX operating mode protocol. Idle TX and RX Mode Control
    [0089] Control of idle TX and RX mode by the PON 2 control unit is explained with reference to Fig. 9. A connector indicated by [A] in Fig. 9 indicates that a flow in Fig. 9 is continuation of a flow indicated by [A] in Fig. 8. First, in steps S60 to S68, the PON 2 control unit performs bandwidth allocation control in a power-saving mode. OLT 1 detects upstream and downstream traffic or a state of a connected device of ONU 10 from the states of temporary storage areas 3 and 4 of OLT 1, information transmitted from ONU 10, and the like. This state information is used for bandwidth allocation in step S68 and determining a shift to a power saving mode in step S69.
    [0090] PON control unit 2 checks a present power saving mode of target ONU 10 and performs limiting a bandwidth allocation amount corresponding to modes and limiting changes of the given Grant (step S61). When ONU 10 is in a state (a full service mode) that is not a power save mode, the PON 2 control unit does not perform bandwidth allocation limitation due to the power save mode. When the power saving mode is the sleep mode, the PON 2 control unit limits the allocated Bi bandwidth limitation of upstream communication to a value configured in advance or a value configured according to a service (step S62 ). If the mode is TX and RX idle mode, the PON 2 control unit configures Bi in the same way as step S62 (step S63) and limits Grant changes to once in times m of the bandwidth update period. band (step S64).
    [0091] For example, a GSi grant waiver flag is set as a flag not to allocate a transmission change in the bandwidth update period in step S68. When this flag is set, in period the PON 2 control unit does not provide a transmission shift to ONU i set with the flag. In step S64, the PON control unit 2 sets the GSi flag (m-1) times in m times to thereby provide a transmission shift to ONU 10 once in m times of the transmission period of the bandwidth. band. In the case of pseudo sleep mode, at steps S65 and S66, OLT 1 performs same processing as steps S63 and S64.
    [0092] The bandwidth allocation method corresponding to a power saving mode is an example. The PON 2 control unit can configure, as needed, limiting and unlimiting the bandwidths and limiting and not limiting the transmission change in modes. For example, PON control unit 2 can limit Lease and a chance of data transmission in an upstream stream even in sleep mode and can provide Lease each time without applying the lease waiver to ONU 10 in sleep mode. TX and RX inactive. The bandwidth limitation is also arbitrary. For example, even if the allocated bandwidth throttling Bi is not configured in particular, an allocation amount by dynamic bandwidth allocation in step S68 is relatively less than that of other ONUs 10 because of a traffic state a amount from ONU 10 or a small amount from a bandwidth allocation request. Therefore, PON control unit 2 can perform bandwidth allocation without distinguishing ONU 10 in a power save mode and ONU 10 not in power save mode.
    [0093] When processing is finished for all ONUs 10, PON control unit 2 allocates bandwidth to ONUs 10. At this point, the grant waiver flag GSi and the allocated bandwidth Bi limitation are used. First, the PON control unit 2 excludes ONUs i configured with the grant waiver flag GSi from the bandwidth allocation targets in the next period. Subsequently, the PON 2 control unit allocates bandwidth to the ONUs 10 using DBA monitoring (Dynamic Bandwidth Allocation), DBA status reporting, or a combination of DBA monitoring and DBA status reporting . At this point, the PON control unit 2 does not provide bandwidths exceeding the bandwidth limitation Bi allocated to ONUs i in a power-saving mode. When the bandwidth allocation ends, the PON 2 control unit reconfigures GSi and Bi.
    [0094] Subsequently, the PON 2 control unit determines, considering ONU 10 not supporting the power save function, based on an upstream traffic state, whether ONU 10 is shifted to a power save mode. (the pseudo sleep mode) or a power saving mode is continued. For example, when traffic in a fixed period is less than a predetermined threshold, the PON 2 control unit shifts ONU 10 to power save mode. The PON control unit 2 can also cause ONU 10 to operate in energy-saving mode on a specific time frame based on a time counter.
    [0095] In step S70, PON control unit 2 performs processing for a request (sleep_mode_req) received by optical transceiver 5 and transmits sleep_mode_ack, which is an allow signal for this request. Details of sleep_mode_req processing are explained further with reference to Fig. 10.
    [0096] In steps S71 to S78, control unit of PON 2 performs instruction control change to a power saving mode by OLT 1. According to this control, OLT 1 can shift ONU 10 under OLT 1 from a power-saving mode to a full-service mode, or moving ONU 10 from a specified power-saving mode to another power-saving mode. As a communication system, it is made possible to effect a more efficient reduction in energy consumption and improve communication quality.
    [0097] PON 2 control unit checks the storage device and detects whether ONU i is in TX and RX idle mode. When ONU i is not in TX and RX inactive mode, in step S73, the PON 2 control unit checks if there is a factor to start TX and RX inactive mode. When the PON 2 control unit determines that there is no factor for inactive TX and RX mode start, the PON 2 control unit moves to processing in step S78 and repeats the same considering the next ONU i.
    [0098] On the other hand, when traffic decreases on a downstream or traffic decreases on an upstream, PON 2 control unit moves to processing at step S74 or S75 and performs transmission preparation of sleep_mode_Ind to shift the ONU 10 for a power saving mode.
    [0099] When ONU 10 moves to TX and RX idle mode in a downstream situation (from full service mode or from sleep mode), PON 2 control unit designates SLEEP as a mode to save energy. When upstream communication continues, sleep is not selected. When ONU 10 shifts to power save mode in an upflow situation, PON 2 control unit designates TWELVE as power save mode.
    [00100] When the PON 2 control unit determines in step S72 that ONU i is in TX and RX idle mode, the PON 2 control unit detects a suspend factor of TX and RX idle mode (step S76 ). When there is no suspend factor, the PON 2 control unit continues the TX and RX idle mode and shifts to processing the next ONU 10. On the other hand, when a suspend factor is the upstream flow, to stop power saving mode and shift to full service mode, the PON 2 control unit assigns wake up and prepare to transmit sleep_mode_Ind (step S77). When sleep factor is downstream, to shift ONU 10 from TX and RX idle mode to sleep mode, PON 2 control unit designates wake as a mode and performs preparation to transmit sleep_mode_Ind (step S77 ). In the figure, a change from sleep mode to the other modes is not described. However, it is also possible to specify transition from the respective power-saving modes such as sleep mode to other power-saving modes, opposite transition to transition, and sleep mode initiation and suspension.
    [00101] A start factor and a sleep sleep factor can be any factors insofar as the factors are criteria for maintaining necessary quality of communication while suppressing power consumption. For example, an amount of traffic in a fixed period, an amount of data accumulated in the temporary storage memory area, ON and OFF information of a device connected to ONU 10, start of a new service, or the like is the criterion. .
    [00102] When the processing explained above finishes, the PON control unit 2 generates a frame in which a bandwidth allocation result and the control message such a sleep_mode_ack or sleep_mode_Ind are stored and transmits the frame to ONU 10 (step S79). At this point, the frame can store the downstream data along with the control message.
    [00103] The PON 2 control unit determines whether it is time when discovery is required (step S80). If discovery is required, the PON 2 control unit moves to processing at step S1 in Fig. 8 (see connector [B]). If discovery is unnecessary, PON control unit 2 returns to step S60 and shifts to control transmission control in the next bandwidth update period. Request processing (sleep_mode_req)
    [00104] FIG. 10 is a diagram of an example processing of the request (sleep_mode_req) by the PON 2 control unit. When the PON 2 control unit receives sleep_mode_req from ONU 10, the PON 2 control unit determines whether a request to from ONU 10 is allowed or changed and returns a determination result as a sleep_mode_rsp message. This processing is shown in Fig. 10.
    [00105] In step S91, the PON 2 control unit checks, by accessing the storage device, whether a power saving mode designated as a parameter in sleep_mode_req is included in the allowed AMi modes of ONU i. When energy saving mode is not designated, the PON 2 control unit sets the energy saving mode to a default value of energy saving mode set in advance by setting in step S2 or similar in Fig. 2 ( step S92). On the other hand, when the designated mode is not present in the AMi allowed modes, the PON 2 control unit corrects the designated mode to an allowed mode or sets rejection information with respect to an offset to energy saving mode (step S93). When the PON 2 control unit switches a designated power saving mode of ONU 10, the PON 2 control unit has to be careful not to deteriorate the communication quality.
    [00106] When processing ends or the designated mode is Ami allowed mode, the PON 2 control unit moves to processing in the next step S94. In this step, the PON 2 control unit checks, by accessing the storage device, if the TX and RX idle time designated as a parameter in sleep_mode_req is within the MaxPSTi maximum sleep time configured for ONU i (step S94). When TX and RX idle time is not assigned, the PON 2 control unit sets the default value DefPSTi of TX and RX idle time set in advance by setting in step S2 or similar in Fig. 2 to TX time and Inactive RX (step S95). On the other hand, when the designated idle TX and RX time is longer than MaxPSTi, the PON 2 control unit either corrects the TX and RX idle time to MaxPSTi or configures rejection information with respect to an offset to an idle mode. energy saving (step S96).
    [00107] When processing ends or TX and RX idle time < MaxPSTi, PON 2 control unit writes PSi power saving mode information in the storage device as information regarding a power saving mode of a corresponding ONU and, at the same time, sets the TX and RX idle time in the Grant time in steps S64, S66, and S68 in Fig. 9 and a PSTi time counter serving as a reference to suppress a warning during power saving.
    [00108] When this processing finishes the PON 2 control unit repeats processing for all sleep_mode_req received.
    [00109] Embodiments of the present invention are explained above. The present invention is not limited to those embodiments. Any modification may be effected as long as the modification is included in the spirit of the present invention. For example, a communication system to which this communication method is applied need not be a PON system. The communication method can also be applied to an optical communication system including an active element. The communication method is not limited to optical communication and can be applied to a communication system in which terminals communicate using an electrical signal.
    [00110] In the above mode, the OLT 1 can control the power saving function in the communication system in consideration of the function or service provided from ONU 10 indicating a shift to a power saving mode and conditions (parameters) for the ONU 10. Considering this function, it is a matter of selection whether or not OLT 1 transmits a transmit permit signal based on the information supporting the energy saving function.
    [00111] As power saving modes, sleep mode, idle TX and RX mode, and pseudo sleep mode are described as examples. However, power saving modes and their protocols are not limited to these modes. The sleep mode can be assigned TX and RX idle mode 1 and the TX and RX idle mode can be assigned TX and RX idle mode 2. Mode parameters corresponding to the modes can be encoded as "1" for the sleep mode. TX and RX idle 1 and set to "2" for TX and RX idle mode 2.
    [00112] As an example of the power-saving protocol, the power-saving protocol in which, in shifting to sleep mode, ONU 10 transmits a request to OLT 1, and when the response is received from from OLT 1, ONU 10 shifts to sleep mode, it is explained. However, it is also possible to control the power save state using other power save protocols. For example, it is also possible that the OLT 1 and the PON control unit 2 thereof determine according to the energy saving function support information that ONU 10 is ONU 10 which supports sleep mode and, if ONU 10 does not return an s-response signal such as Standby Frame in an allotted bandwidth, OLT 1 determines that ONU 10 has shifted to sleep mode and thereafter communicates with ONU 10 of according to the sleep mode protocol. Industrial Applicability
    [00113] The present invention is suitable for a communication method and a communication system in which energy saving is required. Reference Signal List 1 OLT 2 PON CONTROL UNIT 3 , 13 RECEPTION TEMPORARY STORAGE 4 , 12 TRANSMISSION TEMPORARY STORAGE 5 , 14 OPTICAL TRANSCEIVER 6 WDM 7 PHY 10-1 to 10-3 ONUs 11 PON CONTROL UNIT 20-1, 20-2 TERMINALS 30 SUBSCRIBER LINE 40 DIVIDER 51, 142, 161-1, 161-2 Rx 52, 141, 162-1, 162-2 Tx
    权利要求:
    Claims (31)
    [0001]
    1. Control apparatus (2) for a station-side optical line termination apparatus (1) which communicates that a plurality of user-side optical line termination apparatus (10-1 to 10-n) via a common optical fiber, characterized in that the control apparatus (2) receives capability information regarding the energy saving function received from the user-side optical line terminating apparatus, detects the energy saving function of the User-side optical line terminating apparatus representing permission with respect to use of the power saving function in the user-side optical line terminating apparatus to the transceiver (5).
    [0002]
    2. Control apparatus according to claim 1, characterized in that the control apparatus distributes, during a period of inactive transmission, a transmission bandwidth of an upstream signal to the optical line termination apparatus on the side of the user who has been switched to a snooze mode, which is a power saving mode to turn off a transmitter of the user's optical line transmission apparatus and turn on a receiver of the user's optical line termination apparatus.
    [0003]
    3. Station-side optical line termination apparatus (1) of an optical communication system connecting a plurality of user-side optical line termination apparatus (10-1 to 10-n) to the station-side optical line termination apparatus (10-1 to 10-n) station-side optical line (1) using a common optical fiber (40), characterized in that the station-side optical line termination apparatus comprises a transceiver (5); and, a control apparatus (2) as defined in claim 1, which receives capability information regarding the energy saving function of the user-side optical line terminating apparatus from the user-side optical line terminating apparatus. user side and transmits permission information representing permission regarding the use of the power saving function in the user side optical line terminating apparatus to the user side optical line terminating apparatus via the transceiver (5).
    [0004]
    4. Station-side optical line termination apparatus according to claim 3, characterized in that it comprises a control unit (2) which transmits a write command for permission information to the optical line termination apparatus of the user side through the transceiver (5) to thereby cause the user side optical line termination apparatus to write the permission information.
    [0005]
    5. Station-side optical line termination apparatus according to claim 3, characterized in that the permission information includes information representing permission to use each snooze mode, which is a power-saving mode to turn off a transmitting unit of the user-side optical line terminating apparatus and connecting a receiving unit (142) of the user-side optical line terminating apparatus, and a sleep mode, which is a power saving mode to periodically turn off the transmitting unit (141) and the receiving unit (142).
    [0006]
    6. Station-side optical line termination apparatus according to claim 3, characterized in that the capability information includes capability information with respect to a snooze mode, which is a power-saving shutdown mode. a transmission unit of the user-side optical line termination apparatus, and the station-side optical line transmission apparatus selects, based on the capability information, a power-saving protocol, a transmission interval in which for transmit permission information in upstream communication is different from that in snooze mode, for user-side optical line termination apparatus not adapted to snooze mode.
    [0007]
    7. Station-side optical line termination apparatus according to claim 3, characterized in that it comprises a control unit which determines on the basis of the type of service the communication with the station-side optical line termination apparatus user, permission regarding the use of the energy-saving function of the user-side optical line termination apparatus.
    [0008]
    8. Station-side optical line termination apparatus according to claim 7, characterized in that the control unit notifies in advance, as permission information, the user-side optical line terminating apparatus of the permission with regarding the use of the energy saving function determined based on the type of service.
    [0009]
    9. Station-side optical line termination apparatus according to claim 7, characterized in that the control unit monitors upstream communication traffic, determines, based on the capability information regarding the energy saving function from the user-side optical line terminating apparatus received from the user-side optical line terminating apparatus and a result of traffic monitoring, property of a snooze mode change, which is a power-saving mode for the user-side optical line termination apparatus for turning off a transmitting unit of the apparatus and switching on a receiving unit of the apparatus, to a sleep mode, which is a power-saving mode for periodically turning off the transmitting unit and the receiving unit, and transmitting change instruction information to the user-side optical line termination apparatus.
    [0010]
    10. Control apparatus for user-side optical line termination apparatus (10-1 to 10-n) which communicates with a station-side optical line termination apparatus (1) via an optical fiber (40) , characterized in that the control apparatus (11) supplies capability information regarding the energy saving function of the optical line termination apparatus from the user side to the transmitter.
    [0011]
    11. Control apparatus according to claim 10, characterized in that the control apparatus acquires permission information regarding the energy saving function of the user-side optical line termination apparatus through a receiver ( 141) and suppress execution of the power saving function based on the permission information.
    [0012]
    12. Control device according to claim 10, characterized in that the control device acquires the permission information from the station-side optical line termination device through configuration processing using a control interface management applied to the user-side optical line termination apparatus, determines, when to switch to energy-saving mode, based on the permission information, a power-saving mode to be used with allowed energy-saving modes , and notifies the station-side optical line terminator of the determined power-saving mode.
    [0013]
    13. User-side optical line termination apparatus (10-1 to 10-n) connected to a station-side optical line termination apparatus (1) using an optical fiber (40) and including a transmission unit ( 141) which transmits an optical signal to the station side optical line termination apparatus and a receiving unit (142) which receives an optical signal from the station side optical line termination apparatus, characterized in that the apparatus The user-side optical line termination device comprises a control apparatus (11) as defined in claim 10, which provides capability information with respect to a power-saving function of the user-side optical line termination apparatus to the transmission unit (141) and transmits the capability information regarding the energy saving function to the station side optical line termination apparatus via the transmission unit (141).
    [0014]
    14. User-side optical line termination apparatus according to claim 13, characterized in that the receiving unit receives permission information indicating permission regarding the use of the power saving function from the terminating apparatus optical line on the station side, and the control unit uses the energy saving function based on the permission of the information received by the receiving unit.
    [0015]
    15. User-side optical line termination apparatus according to claim 14, characterized in that the user-side optical line termination apparatus suppresses performance of the power-saving function on the basis of permission information.
    [0016]
    16. User-side optical line termination apparatus according to claim 13, characterized in that the capability information with respect to the energy saving function includes capability information representing the executability of each of the snooze mode, which is a power saving mode for turning off the transmitting unit and turning on the receiving unit, and a sleep mode which is a power saving mode for periodically turning off the transmitting unit and receiving unit.
    [0017]
    17. User-side optical line termination apparatus according to claim 14, characterized in that the permission information includes information representing permission to use each of the snooze mode, which is a power-saving mode for turning off the transmitting unit and turning on the receiving unit, and a sleep mode, which is a power-saving mode for periodically turning off the transmitting unit and receiving unit.
    [0018]
    18. User-side optical line termination apparatus according to claim 14, characterized in that the user-side optical line termination apparatus acquires in advance the permission information from the optical line transmission apparatus on the user's side. of the station through information processing by using the management control interface, selects, when changing the energy saving mode, based on the information permission, an energy saving mode to be used from energy saving modes allowed , and notifies the station-side optical line terminating apparatus, and notifies the station-side optical line terminating apparatus of the selected energy saving mode.
    [0019]
    19. User-side optical line termination apparatus according to claim 13, characterized in that the user-side optical line termination apparatus performs the energy-saving function by reducing the power supplied to the power unit. streaming.
    [0020]
    20. An optical communication system characterized in that it comprises: a plurality of user-side optical line termination apparatus (10-1 to 10-n) (referred to herein as ONUs); and a station-side optical line transmission apparatus (1) (herein referred to as the OLT) as defined in claim 3, connected to the ONUs using a common optical fiber (40), wherein at least the ONU (10-1) ) as a part of the ONUs is a user-side optical line termination apparatus as defined in claim 13 and includes: a transceiver (14) including a transmit unit (141) and a receive unit (142) and having a power saving function to cut power consumed by inactivation transmission; and a control unit (11) which transmits capability information regarding the energy saving function to the OLT (1) via the transceiver.
    [0021]
    21. Communication system according to claim 20, characterized in that the OLT includes a control unit (2) that transmits a write command for the permission information to the ONU through the OLT transceiver to thus make the ONU write the permission information.
    [0022]
    22. Communication system according to claim 20 or 21, characterized in that the ONU receiving unit receives the permission information, and the ONU suppresses the execution of the energy saving function based on the permission information received by the ONU. receiving unit.
    [0023]
    23. Communication system according to claim 20, characterized in that the capability information with respect to the power-saving function includes information representing executability of each snooze mode, which is a power-saving mode for turning off the transmitting unit and turning on the receiving unit, and a sleep mode, which is a power-saving mode for periodically turning off the transmitting unit and receiving unit.
    [0024]
    24. Communication system according to claim 20, characterized in that the permission information includes information representing permission to use each of the snooze modes, which is a power-saving mode for turning off the transmission unit and turning it on. the receiving unit, and a sleep mode, which is a power-saving mode for periodically turning off the transmitting unit and receiving unit.
    [0025]
    25. Communication system according to claim 20 to 24, characterized in that at least two types of ONUs between the ONU adapted to a snooze mode, which is a power saving mode to turn off the transmission unit and turn on the receiving unit, the ONU adapted to either sleep mode, which is a power-saving mode to periodically turn off the transmitting unit and the receiving unit, and the snooze mode or both, and the ONU does not adapted for both snooze mode and sleep mode are configured to be able to be mixed, and the OLT control unit receives the cabling information regarding the energy saving function via the OLT transceiver and selects a saving function of energy used in the ONU outside of a plurality of energy saving functions.
    [0026]
    26. Communication system according to claim 25, characterized in that the control unit of the OLT monitors a transmission status of upstream communication of the ONU to thus determine a displacement of the ONU to the energy saving mode and, when the ONU is an ONU not adapted to both snooze mode and sleep mode, it changes a transmission interval of the transmit permission signal to be long and reduces energy consumed for transmitting a response signal to a transmit permission signal .
    [0027]
    27. Communication system according to claim 26, characterized in that the control unit of the OLT controls, based on the capability information regarding the energy saving function, the transmission interval of the transmission permission information of the ONU not adapted to be an interval longer than a transmit permission signal transmission interval to the ONU operating in snooze mode.
    [0028]
    28. Communication system according to any one of claims 23 to 27, characterized in that the OLT control unit instructs, based on the capability information regarding the energy saving function, the ONU to switch from from snooze to sleep mode.
    [0029]
    29. Communication method performed by a station-side optical line termination apparatus for a communication system in which a user-side optical line termination apparatus (10-1, 10-2, 10-3) is connected to the station-side optical line termination apparatus (1) by a communication line (40), the communication method characterized in that it comprises: receiving capability information regarding an energy saving function of the apparatus user-side optical line termination from user-side optical line termination apparatus (10-1, 10-2, 10-3); the station-side optical line termination apparatus (1) detecting a power-saving function of the user-side optical line termination apparatus (10-1, 10-2, 10-3); and the station-side optical line termination apparatus (1) transmitting permission information representing permission with respect to the use of a power-saving function in the user-side optical line terminating apparatus (10-1, 10- 2, 10-3) to the user-side optical line termination apparatus (10-1, 10-2, 10-3).
    [0030]
    30. Communication method according to claim 29, characterized in that when switching to a snooze mode, which is a power-saving mode for turning off a transmitting unit (141) and turning on a receiving unit (142) , or a sleep mode, which is a power-saving mode to periodically turn off the transmitting unit and the receiving unit, the slave station apparatus makes the power-saving mode allowed to operate and suppress operation in a power saving mode to not be allowed based on the permission information.
    [0031]
    31. Communication method according to claim 29 or 30, characterized in that it comprises the master station apparatus transmitting to the slave station apparatus a signal to set a time at which the transmission unit of the slave station apparatus is turned off.
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    同族专利:
    公开号 | 公开日
    EP2955932A1|2015-12-16|
    KR20120042896A|2012-05-03|
    JP2011223437A|2011-11-04|
    TW201220733A|2012-05-16|
    EP2451123A1|2012-05-09|
    BR112012002126B8|2022-02-01|
    CN104683887A|2015-06-03|
    RU2493663C1|2013-09-20|
    CN102474441B|2015-04-01|
    EP2955932B1|2021-05-26|
    ZA201200204B|2013-03-27|
    TWI407709B|2013-09-01|
    EP2451123B1|2015-08-05|
    US20120128357A1|2012-05-24|
    JP4812884B2|2011-11-09|
    US20140086584A1|2014-03-27|
    EP2451123A4|2013-12-04|
    BR112012002126A2|2017-01-03|
    KR101256768B1|2013-04-25|
    US8934770B2|2015-01-13|
    CN102474441A|2012-05-23|
    US9130677B2|2015-09-08|
    WO2011129318A1|2011-10-20|
    CN104683887B|2018-11-02|
    MY158788A|2016-11-15|
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    法律状态:
    2018-03-27| B15K| Others concerning applications: alteration of classification|Ipc: H04L 12/44 (2006.01), H04B 10/00 (2013.01) |
    2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-05-05| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04L 12/44 , H04B 10/00 Ipc: H04B 10/272 (2013.01), H04L 12/12 (2006.01), H04Q |
    2020-05-05| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-10-26| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2022-01-11| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 12/04/2011, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |
    2022-01-25| B09W| Correction of the decision to grant [chapter 9.1.4 patent gazette]|Free format text: IINCORRECOES NO QUADRO REIVINDICATORIO, REIVINDICACOES 1, 9 E 18 |
    2022-02-01| B16C| Correction of notification of the grant [chapter 16.3 patent gazette]|Free format text: REFERENTE AO DESPACHO 16.1 PUBLICADO NA RPI 2662 DE 11.01.2022, QUANTO AS REIVINDICACOES |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2010-092120|2010-04-13|
    JP2010092120A|JP4812884B2|2010-04-13|2010-04-13|COMMUNICATION SYSTEM, STATION-SIDE OPTICAL LINE TERMINATION DEVICE, USER-SIDE OPTICAL LINE TERMINATION DEVICE, CONTROL DEVICE, AND COMMUNICATION METHOD|
    PCT/JP2011/059054|WO2011129318A1|2010-04-13|2011-04-12|Communication system, station-side optical circuit terminating apparatus, user-side optical circuit terminating apparatus, control apparatus, and communication method|
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