JP5871836B2 - Subscriber side gateway device - Google Patents

Description

  The present invention relates to a subscriber-side gateway for power saving of a subscriber-side termination device in an optical communication system in which a subscriber-side termination device and a station-side termination device are connected by a point-to-multipoint passive optical network. Relates to the device.

  The spread of broadband including FTTH is an opportunity to develop various ICT services. For example, the home ICT service, which is a service using the OSGi (Open Service Gateway Initiative) platform, which has a mechanism for adding, updating, and deleting software operating on the HGW (Home Gateway) from the center side has been started. . Therefore, it is expected that various information devices will be connected to the network through the HGW in the future.

  On the other hand, the recent social demand for reducing environmental impact is one of the important considerations. The demand for power saving for communication devices is also strict, and the same is true for optical access networks. It is said that the power consumption of the optical access network accounts for about 80% of the power consumption of the optical communication network. This is because in an optical access network, the absolute number of ONUs (Optical Network Units) is large and the ratio of power consumption is high. Furthermore, the increase in the number of FTTH users and the spread of various ICT services also means the increase in the absolute number of ONUs and the increase in the absolute number of HGWs connected to them. Access systems such as ONU and HGW It is expected that the demand for power saving for in-home devices will increase further.

  A typical network configuration of an optical access network and a home network in the next generation network (NGN: Next Generation Network) will be described. As shown in FIG. 1, as a typical network configuration of an optical access network, a single star in which an ONU 92 that is a subscriber-side termination device and an OLT 91 (optical line terminal) that is a station-side termination device are connected one-to-one. (SS: Single Star) configuration and, as shown in FIG. 2, a passive optical network (PON) configuration in which a plurality of ONUs and one OLT are connected in a 1: n relationship (n is a natural number). is there.

  In the SS system, the ONU can occupy the OLT, so that high-speed communication is possible, but there is a disadvantage that the apparatus cost is high. On the other hand, in the PON system, the PON system is adopted in many optical access networks because a plurality of ONUs share one OLT and optical fiber equipment and are excellent in economic efficiency. Typical standards for gigabit class PON include EPON (Ethernet (registered trademark) PON) standardized in IEEE802.3ah task force, 10G-class PON system standardized in IEEE802.3av task force. There is EPON.

  A typical network configuration in the home network will be described. In the home network, the HGW is connected to the (UNI: User Network Interface) of the ONU, and the information device is connected to the destination. As measures for power saving in optical access networks, a sleep method that pauses unused parts of the ONU when there is no communication (idle state) and an adaptive link rate method that changes the link rate according to the amount of communication are considered. (See, for example, Non-Patent Document 1). However, when the method using the above communication device is applied, a sleep threshold time, which is a time for determining whether or not the power supply control part of the ONU is to sleep, is necessary. The power supply stop time was shortened, and the power saving effect was limited. The sleep threshold time is set at an arbitrary time, and the input traffic arrival interval is compared with the sleep threshold time to determine whether or not to enter sleep. The operation when the prior art is applied to an arbitrary ONUi constituting the PON system will be described.

  This will be described with reference to a temporal transition diagram regarding the state of the power supply control part of the ONU for a certain input traffic shown in FIG. The upper time chart shows the ONU input traffic, and the vertical axis shows the instantaneous link rate when the UNI is Gigabit Ethernet (registered trademark) (GbE). As shown in FIG. 3, in the present embodiment, the instantaneous link rate when a frame is input is 1 Gbit / s. The second level shows an ideal ONU activation state when the upper level traffic flows. Here, when power is supplied to the power supply control portion, the “startup” state is set, and when power is not supplied, the “sleep” state is set. The former time is set as the start time, and the latter time is set as the sleep time. . The third row shows the activation state of the conventional ONU when the upper-stage traffic flows.

First, a case where input traffic is observed in the ONU will be described.
Between times t ₂ to t _th is a constant sleep time threshold possible transitions to the sleep state are completed, if the traffic was not observed, it is determined that the no-communication state. The control signal for commanding the sleep implemented for the power supply control portion of the ONU is transmitted at time t _2. Then, from the time t ₃ when CPU and OS in ONU, the command processing time indicating the delay taken by the application processing ends, enters a sleep time t ₄ to stop power supply to the power supply control portion of the ONU. Further, when the uplink traffic is flowing at time t _5, at time t ₅ is transmitted a control signal for instructing an activation respect to the feeding control portion of the ONU. Then, enter from the time t ₆ the command processing time is completed, the active state at time t ₇ to resume power supply to the power supply control portion of the ONU. Such an operation is repeated. When the input traffic interval is narrower than the sleep threshold time t _th as at times t _{14 to} t ₁₅ , it is determined as a communication state and a control signal for instructing sleep introduction cannot be transmitted. I can't do it.

“Study and Demonstration of Sleep and Adaptive Link Rate Control Mechanisms for Energy Efficient 10G-EPON”, IEEE / OSA Journal of Optical Opt. 2, no. 9, pp. 716-729, September 2010

As described above, the sleep threshold time t _th becomes a limiting factor when the sleep is introduced, and the sleep time is limited, thereby reducing the power saving effect. In addition, there is a problem with respect to command processing time, which is the time from when a command related to sleep / start-up is given until it actually operates, so that there is a problem that the sleep time is limited and the power saving effect is reduced.

  In order to achieve the above object, the present invention uses a subscriber-side gateway device connected to the end of the ONU, and determines the upstream traffic information transmitted from the ONU to the OLT or the usage state of the information equipment in the preceding stage of the ONU. Detection is performed in advance, and sleep / wake-up in the ONU is determined based on this information.

Specifically, the subscriber side gateway device of the present invention is:
A subscriber-side gateway device connected to the subscriber-side termination device in an optical communication system in which a station-side termination device and a subscriber-side termination device are connected by a passive optical network,
A detection unit for detecting traffic information flowing in from an information device that transmits and receives information to and from the station-side terminal device;
A monitoring unit that monitors traffic information detected by the detection unit;
A queue accumulating unit for accumulating traffic from the information device;
An arrival interval of traffic flowing in from the information device is detected , the arrival interval is determined as a power supply control timing of the subscriber-side termination device, and a control signal indicating the power supply control timing of the subscriber-side termination device is A sleep / startup determining unit for notifying the person-side terminal device,
A signal processing unit for transmitting the traffic stored in the queue storage unit to the subscriber-side terminal device;
Is provided.

In the subscriber side gateway device of the present invention,
The queue accumulation unit accumulates traffic for a predetermined threshold time after traffic flows into the queue accumulation unit,
The sleep / wake-up determination unit is configured to determine whether the subscriber-side terminating device is based on an amount of traffic stored in the queue storage unit from when traffic enters the queue storage unit until the threshold time is reached . The power supply control timing may be determined.

In the subscriber side gateway device of the present invention,
The detection unit further detects the priority of traffic flowing in from the information device,
The monitoring unit further monitors the priority of the traffic detected by the detection unit,
The sleep / activation determination unit may determine the power supply control timing of the subscriber-side termination device based on the priority identified by the monitoring unit.

In the subscriber side gateway device of the present invention,
The queue accumulating unit has one or more class-specific queues according to the priority of traffic,
A queue observation unit for observing the amount of traffic accumulated in the queue accumulation unit and the accumulation time for each of the class-specific queues;
The detection unit further detects the priority of traffic flowing in from the information device,
The monitoring unit further monitors the priority of the traffic detected by the detection unit,
The sleep / activation determination unit may further determine the power supply control timing of the subscriber-side terminating device based on the traffic amount and accumulation time observed by the queue observation unit and the traffic priority.

In the subscriber side gateway device of the present invention,
When the sleep / wakeup determination unit receives a notification from the queue observation unit that it has been accumulated in the high-priority class-specific queue among the class-specific queues, it quickly supplies power to the subscriber-side terminal device. To the effect, notify the subscriber side terminal device of a control signal to that effect,
The signal processing unit may promptly transmit the traffic accumulated in the high priority class queue to the subscriber-side terminating device after the notification of the control signal.

In the subscriber side gateway device of the present invention,
When the sleep / wakeup determination unit receives a notification from the queue observation unit that it has accumulated in a predetermined specific class queue among the class-specific queues, traffic flows into the specific class-specific queue. Then, after a certain time has elapsed, determine the power supply control timing of the subscriber-side termination device, and notify the subscriber-side termination device of a control signal to that effect,
When the signal processing unit receives the notification of the control signal, after a predetermined time has elapsed since the traffic flowed into the specific class-specific queue, the signal processing unit terminates the priority-level traffic of the specific class-specific queue at the subscriber-side termination. You may transmit to an apparatus.

In the subscriber side gateway device of the present invention,
When the sleep / activation determination unit receives a notification from the queue observation unit that it has been observed that it has accumulated in the high priority class queue and the low priority class queue of the class queue, Based on the amount of traffic accumulated in the high-priority class queue and the low-priority class queue, the power supply control timing of the subscriber-side terminating device is determined,
The signal processing unit may collectively transmit the traffic stored in the high priority class queue and the low priority class queue to the subscriber-side terminal device.

In the subscriber side gateway device of the present invention,
The detection unit further detects on / off information of the information device,
The monitoring unit further monitors on / off information of the information device detected by the detection unit,
The sleep / activation determination unit may further determine the power supply control timing of the subscriber-side termination device based on on / off information of the information device monitored by the monitoring unit.

In the subscriber side gateway device of the present invention,
The detection unit further extracts information on the operating state of the information device,
The monitoring unit further monitors the operating state of the information device detected by the detection unit,
The sleep / startup determination unit may further determine the power supply control timing of the subscriber-side termination device based on the operating state of the information device monitored by the monitoring unit.

In the subscriber side gateway device of the present invention,
The monitoring unit further analyzes the usage pattern of the information device based on the traffic information detected by the detection unit,
The sleep / activation determination unit may further determine the power supply control timing of the subscriber-side termination device based on usage pattern information of the information device analyzed by the monitoring unit.

Specifically, the power-saving method of the subscriber-side termination device of the present invention is:
Power saving method for subscriber side termination device using subscriber side gateway device connected to subscriber side termination device in optical communication system in which station side termination device and subscriber side termination device are connected by passive optical network Because
A detection procedure for detecting traffic information flowing into the subscriber gateway device from an information device that transmits / receives information to / from the station terminal device;
A monitoring procedure for monitoring traffic information detected by the detection procedure;
An arrival interval of traffic flowing in from the information device is detected , the arrival interval is determined as a power supply control timing of the subscriber-side termination device, and a control signal indicating the power supply control timing of the subscriber-side termination device is A sleep / startup determination procedure for notifying the user-side terminal device,
A traffic transmission procedure for transmitting traffic flowing in from the information device to the subscriber-side terminal device;
In order.

  The above inventions can be combined as much as possible.

  The present invention extends the sleep time of the subscriber-side terminating device because the subscriber-side gateway device that can know the upstream traffic information before the subscriber-side terminating device transmits a control signal notifying the power supply control timing. Thus, the power saving effect of the subscriber-side terminal device can be improved.

A typical single star configuration of an optical access network is shown. 1 shows a typical PON configuration of an optical access network. The time transition figure regarding the state of the electric power feeding control part of ONU with respect to input traffic is shown. The schematic diagram of the subscriber side gateway apparatus concerning the embodiment of the present invention is shown. The specific example of the system configuration | structure in Embodiment 1 is shown. 2 shows an example of a flowchart of an ONU power saving method according to the first embodiment. 3 is a time chart illustrating an example of an ONU activation state according to the first embodiment. 2 shows a second example according to the first embodiment. 3 shows a third example according to the first embodiment. The schematic diagram of the subscriber side gateway apparatus which concerns on Embodiment 2 is shown. The specific example of the system configuration | structure in Embodiment 2 is shown. 6 shows an example of a flowchart of an ONU power saving method according to a second embodiment. FIG. 6 is a schematic diagram of a subscriber-side gateway device according to a third embodiment. 10 is a time chart illustrating an example of an ONU activation state according to the fourth embodiment. 10 shows an example of a flowchart of an ONU power saving method according to a fifth embodiment. 10 shows an example of a flowchart of an ONU power saving method according to a sixth embodiment. FIG. 10 is a schematic diagram of a subscriber-side gateway device according to a seventh embodiment.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments.

  DESCRIPTION OF EMBODIMENTS Embodiments according to a subscriber-side gateway device and a power-saving method using the subscriber-side gateway device according to the present invention will be described below with reference to the drawings. FIG. 4 shows a schematic diagram of the subscriber-side gateway device according to the present embodiment. The subscriber-side gateway device according to the present embodiment is connected to a subscriber-side termination device that terminates a network line on the upper side, and is connected to an information device 84 such as VoIP 841, PC 842, and TV 843 on the lower side. The subscriber-side terminal device 82 is, for example, the ONU 92 shown in FIG. The traffic in the present embodiment refers to the upstream traffic that flows from the information device 84 to the subscriber side gateway device 83 and then transmitted to the subscriber side termination device 82. The subscriber side gateway device 83 is, for example, the HGW 93 shown in FIG.

  The subscriber-side gateway device 83 includes a detection unit 31, a monitoring unit 32, a queue accumulation unit 35, a sleep / activation determination unit 33, and a signal processing unit 34. Compared with the conventional apparatus configuration, the subscriber-side gateway apparatus 83 is different in that it includes a detection unit 31, a monitoring unit 32, and a sleep / startup determination unit 33.

  The power saving method for the subscriber-side terminating device according to the present embodiment includes a detection procedure for detecting information obtained from the information device 84 connected to the subscriber-side gateway device 83, a monitoring procedure, and a sleep / activation determination procedure. And a traffic transmission procedure in order.

When traffic flows from the information device 84, a detection procedure is executed.
In the detection procedure, the detection unit 31 detects traffic information flowing from the information device 84 and the usage state of the information device 84. Traffic from the information device 84 is accumulated in the queue accumulation unit 35.
In the monitoring procedure, the monitoring unit 32 monitors information detected by the detection unit 31. Thereby, the subscriber-side gateway device 83 grasps the traffic information and the usage status of the information device 84 prior to the subscriber-side terminal device 82.
In the sleep / startup determination procedure, the sleep / startup determination unit 33 sends a control signal for instructing the timing of entering sleep or start-up based on the traffic information transmitted from the monitoring unit 32 and the information on the usage status of the information device 84. It is generated and notified to the subscriber-side terminal device 82. The notification to the subscriber-side terminal device 82 using the control signal is performed before the traffic is transmitted from the queue storage unit 35 to the subscriber-side terminal device 82.
In the traffic transmission procedure, the signal processing unit 34 transmits the traffic accumulated in the queue accumulation unit 35 to the subscriber-side terminal device 82. By notifying a control signal from the sleep / activation determining unit 33 to the subscriber-side terminal device 82 in advance, for example, some functions of the subscriber-side terminal device 82 can be put into sleep or activated in accordance with upstream traffic. .

(Embodiment 1)
The operation in this embodiment when the network line is an optical access network line, the ONU 92 is used as the subscriber-side termination device 82, and the HGW 93 is used as the subscriber-side gateway device 83 according to this embodiment will be described. As shown in FIG. 5, the HGW 93 and the ONU 92 are connected via the UNI. The HGW 93 mainly includes a PHY 36, a detection unit 31, a monitoring unit 32, a sleep / startup determination unit 33, a signal processing unit 34, and a queue accumulation unit 35. The ONU 92 mainly includes a PHY 24, a sleep / wakeup determination unit 21, a signal processing unit 22, a queue storage unit 23, and an optical transceiver (TRx: Transceiver) 25.

Next, operations in various communication apparatuses and between communication apparatuses according to the present invention will be described. Here, the operation in the case where the inflow of traffic to the subscriber side gateway apparatus is detected and the power supply control timing to the ONU 92 is notified based on the traffic information detected by the detection unit 31 will be described using the flowchart of FIG. .
First, when the inflow of traffic is confirmed in the detection unit 31 of the HGW 93 (S101), the monitoring unit 32 monitors the traffic arrival interval (S102). The monitoring unit 32 notifies the sleep / activation determination unit 33 of the result of monitoring the arrival interval (S103).
Next, the sleep / activation determination unit 33 determines the power supply control timing based on the traffic arrival interval, and notifies the ONU 92 of information related to the power supply control timing using the control signal (S104).

  Next, the operation when applied to any HGW 93 and ONU 92 will be described using the time transition diagram shown in FIG. The upper time chart shows the input traffic flowing from the HGW 93. The second level shows an ideal ONU 92 activation state when the upper level traffic flows. The third level shows the activation state of the conventional ONU 92 when the upper level traffic flows. The fourth level shows a control signal including information related to the power supply control timing of the ONU transmitted from the sleep / startup determination unit 33 of the HGW 93. The lower stage shows the ONU activation state when the power supply control to the ONU 92 is performed in accordance with the control signal of the fourth stage when the upper stage traffic flows, which is an effect of the present invention.

At time _{t 1} receives a control signal transmitted from sleep / activation determination section 33 of HGW93, ONU92 enter sleep state until the time _t 2 ~t ₅ through transient response time of the components. At time _{t 5} receives control signals from being transmitted from sleep / activation determination section 33 of HGW93, ONU92 until the time _t 6 ~t ₈ through transient response time of the components entering the active state. By repeating such an operation, the sleep time can be made longer than the conventional power saving method.

  Further, in the conventional power saving method, if the traffic arrival interval in the ONU 92 is equal to or less than the sleep threshold time, the ONU 92 cannot sleep. On the other hand, in the present invention, since no threshold value is provided in the ONU 92, a control signal related to the power supply control timing from the HGW 93 to the ONU 92 is transmitted in advance before the traffic is input to the ONU 92, so the command processing time can be shortened. It is. Thereby, since the sleep time of ONU92 can be lengthened, this invention can improve a power saving effect compared with the conventional power saving method.

For the operation of the first embodiment, the following method may be used.
For example, the subscriber-side gateway device 83 is the HGW 93 and the subscriber-side termination device 82 is the ONU 92. However, separate housings may be used as described above. A configuration having a function may be used.
Further, as shown in FIG. 8, the ONU 92 may mainly have a configuration including a PHY 24 and a TRx 25.
Further, as shown in FIG. 9, the HGW 93 may include a part of the functions such as TRx25 of the ONU 92 on the substrate of the HGW 93.
In addition, as a method of transmitting the control report, the sleep / startup information is transmitted separately, but a method of collectively transmitting information on the sleep / startup information to one control signal may be used.
In addition, as a method for transmitting the control signal, when the HGW 93 and the ONU 92 are connected using a separate line and a physical signal is used, or a method of placing the main signal on the control protocol using LLDP (Link Layer Discovery Protocol), Alternatively, a method using Zigbee (registered trademark), which is a wireless communication standard standardized in IEEE 802.15.4, may be used.

(Embodiment 2)
Unlike Embodiment 1, in addition to the traffic information detected by the detection unit 31 in the subscriber side gateway device 83, the subscriber side termination device is based on the traffic accumulation information of the queue accumulation unit 35 observed by the queue observation unit 37. A case where the power supply control timing to 82 is notified will be described. Specifically, as shown in FIG. 10, a queue observation unit 37 for observing the presence / absence of traffic flowing into the queue storage unit 35 and the amount of traffic and a timer 38 for measuring the traffic storage time are implemented. Different from Form 1.

Next, a specific operation in the present invention will be described.
The HGW 93 detects, for example, a traffic interval flowing into the HGW 93 and transmits the detection information to the monitoring unit 32 in the detection unit 31 illustrated in FIG.
The queue observation unit 37 sets a threshold value for a certain period of time for the traffic flowing into the queue accumulation unit 35, and the queue accumulation unit 35 performs the threshold time after the traffic flows into the queue accumulation unit 35. Accumulate traffic. This traffic accumulation time is measured by the timer 38.
The sleep / startup determination unit 33 determines the power supply control timing of the ONU 92 from the traffic information detected by the detection unit 31 and the traffic accumulation information in the queue accumulation unit 35, and transmits a control signal.

In the present invention, the operation of the HGW 93 from when the traffic flows into the HGW 93 to when the traffic is transmitted to the ONU 92 will be described with reference to the flowchart shown in FIG.
The operation when the inflow of traffic is confirmed in the detection unit 31 of the HGW 93 (S201) when there is traffic in the queue storage unit 35 (Yes in S202) and when there is no traffic will be described.
First, the inflow of traffic is confirmed in the detection unit 31, and when the traffic is accumulated in the queue accumulation unit 35 at that time, the queue observation unit 37 sets the time T to the timer value Tth_timer, that is, T = Tth_timer. The traffic is accumulated in the queue accumulation unit 35 until it becomes (S204). While accumulating, the queue observation unit 37 calculates the amount of traffic accumulated in the queue accumulation unit 35 until T = Tth_timer (S205), and notifies the sleep / activation determination unit 33 of it. The sleep / activation determination unit 33 determines the power supply control timing based on the traffic amount in the queue accumulation unit 35, and transmits a control signal corresponding to the traffic amount in the queue accumulation unit 35 to the ONU 92 (S206). Then, after T = Th_timer, the signal processing unit 34 transmits the frame accumulated in the queue accumulation unit 35 to the ONU 92 and resets the timer value of the timer 38 (S207).

  On the other hand, when the inflow of traffic is confirmed in the detection unit 31 (S201), if there is no traffic in the queue accumulation unit 35 (No in S202), the timer value Tth_timer is reset (S203), and the inflowing traffic is changed to the queue accumulation unit. The traffic is accumulated until the timer value Tth_timer reaches 35, that is, T = Tth_timer (S204). While accumulating, the amount of traffic in the queue accumulating unit 35 is calculated (S205), and the information on the power supply control timing is transmitted from the sleep / activation determining unit 33 to the ONU 92 (S206), and T = Th_timer. After that, the frame accumulated in the HGW 93 is transmitted to the ONU 92 and the timer value is reset (S207).

  An arbitrary value can be set as the timer value Tth_timer. However, the timer value needs to be set according to the maximum storable traffic amount and the maximum or average input rate. This is to prevent buffer overflow when frames are accumulated in the HGW 93. For example, when the buffer capacity of the HGW 93 is 100 kbytes and the average input rate is 40 Mbit / s, the timer value of the timer 38 needs to be set within Tth_timer = 20 ms.

  The power saving method for the subscriber-side terminal device according to the present embodiment repeats the above operation. The constant threshold time set in the present embodiment is set shorter than the delay time allowed for the flowed-in traffic. The certain threshold time is related to the amount of buffer stored in the queue storage unit 35 of the HGW 93. The maximum buffer amount stored within the threshold time is required to be smaller than the buffer amount in the queue storage unit 35 of the HGW 93. For this reason, the timer value needs to be set within a range not exceeding the buffer capacity of the HGW 93 even when frames are accumulated in the buffer of the HGW 93 at the maximum input rate.

  For the operation of the second embodiment, the following method may be used. As a traffic management method in the queue storage unit 35, the threshold time is calculated using the timer 38, but a method of calculating the buffer amount in the buffer of the HGW 93 may be used.

  For the operation of the second embodiment, the following method may be used. The subscriber-side gateway device 83 is the HGW 93 and the subscriber-side termination device 82 is the ONU 92. However, separate housings may be used in this way, and functions such as the HGW 93 and the ONU 92 may be provided on the same base in one housing. It may have a configuration. The ONU 92 may have a configuration mainly including PHY 24 and TRx 25. Moreover, the structure which includes some functions, such as TRx25 of this ONU92, on the board | substrate of this HGW93 may be sufficient.

  Further, as a method of transmitting the control signal, the sleep / startup information is transmitted separately, but a method of collectively transmitting information regarding the sleep / startup information to one control signal may be used. In addition, as a method for transmitting the control signal, when the HGW 93 and the ONU 92 are connected using a separate line and a physical signal is used, or a method of placing the main signal on the control protocol using LLDP (Link Layer Discovery Protocol), A method using Zigbee, which is a wireless communication standard standardized in IEEE 802.15.4, may be used.

(Embodiment 3)
Unlike the first embodiment and the second embodiment, the subscriber-side gateway device 83 has one or more queues according to the traffic priority, and the queue observation unit 37 observes the traffic priority. A case where a traffic transfer method considering the above is used will be described. Specifically, as shown in FIG. 13, the queue accumulation unit 35 has a class-specific queue corresponding to the priority, which is different from the first and second embodiments. In this embodiment, the queue # 1 and the queue # 2 have a function of managing high priority and low priority traffic, respectively.

  Next, a specific operation in the present invention will be described. Here, a case will be described in which traffic relating to Voice Over Internet Protocol (VoIP) communication using Session Initiation Protocol (SIP) flows as high priority traffic. The queue observation unit 37 of the HGW 93 monitors the priority of traffic, and when high priority traffic flows into the queue # 1, the sleep / wakeup determination unit 33 maintains the communication quality of traffic with high priority. Information that high-priority traffic has flowed into the ONU 92 in advance is notified using a control signal. After transmitting the control signal from the HGW 93, the signal processing unit 34 transmits the high priority traffic in the queue accumulation unit 35 to the ONU 92. As a result, regarding high priority traffic, traffic can be transmitted within an allowable delay time, so that communication quality can be maintained.

  The traffic monitoring method in the queue observation unit 37 of the HGW 93 in the present embodiment is such that the queue accumulation unit 35 is provided with a queue # 1 in which a predetermined type of traffic enters as shown in FIG. In addition, the function of observing the value of Type of Service (ToS) in the header of the IP packet for each traffic is also detected. 35, a method for confirming high-priority traffic may be used, and the ToS value of the IP packet is set so as to correspond to the value of Class of Service (CoS) of the MAC frame with the VLAN tag, Even with a method in which the detection unit 31 or the queue storage unit 35 has a function of observing the CoS value for each frame. There. In addition, VoIP communication using SIP has been exemplified as the high priority traffic, but the present invention is not limited to this, and when a high priority service is newly provided in the future, the traffic is also applicable.

(Embodiment 4)
Unlike the third embodiment, the subscriber-side gateway device 83 has one or more queues according to the traffic priority, and the queue observation unit 37 observes the traffic priority, and the high-priority and low-priority traffic. The operation in the case of using the traffic transfer method considering the priority when there is an inflow will be described with reference to FIGS. 13 and 14. FIG. Here, a case where traffic related to VoIP communication flows as high priority traffic will be described.

  The queue observation unit 37 of the HGW 93 shown in FIG. 13 monitors the priority of traffic, and when high priority traffic flows into the queue # 1, in order to maintain the communication quality for the high priority traffic, the sleep / activation determination Information that high-priority traffic has flowed from the unit 33 to the ONU 92 is notified in advance. If high-priority traffic has flowed in and low-priority traffic has been accumulated in the queue accumulation unit 35 in advance, in the signal processing unit 34, the HGW 93 summarizes the low-priority traffic according to the transmission timing of the high-priority traffic. Send all at once.

These operations will be described with reference to the time chart of FIG. The upper time chart shows the traffic that flows into queue # 1 of the HGW 93, the second time chart shows the traffic that flows into queue # 2 of the HGW 93, and the third time chart shows the control notified in advance from the HGW 93 The signal and the bottom row show the ONU activation state according to the present invention. As shown in FIG. 14, when traffic flows into the queue # 1 and the queue # 2, the traffic is accumulated in the queue # 1 and the queue # 2 of the HGW 93. Time _{t 0 ~t 1, t 2 ~t} 3, t 4 queue # 2 of traffic flowing between ~t ₅ is to accumulate at the queue # 2.

The control signal is then sent at time _{t 7} from HGW93 to ONU92. Then, through the command processing time, some containing TRx25 of ONU92 that was pause function is activated at time _t 8 ~t _9, it had accumulated in the traffic and queue # 2 which has flown into the queue # 1 of HGW93 traffic at time _t 9 _{~t 11} are transmitted at once.
Then, at time _t 13 _{~t 15} via the command processing for instructing a sleep at a time _t 11 _{~t 12,} is sleep Some features of ONU92.

  As described above, the subscriber-side gateway device according to the present embodiment can improve the power saving effect by reducing the number of sleep / activation transitions and increasing the sleep time. Furthermore, since the subscriber-side gateway device according to the present embodiment can transmit traffic within an allowable delay time for high-priority traffic, communication quality can be maintained.

(Embodiment 5)
Unlike the first and second embodiments, the detection unit 31 of the subscriber-side gateway device 83 observes information about the start or end of use of the information device 84, that is, the on / off information of the information device 84, so that the subscriber side An operation in the case of using a method of controlling the power feeding timing to the termination device 82 is shown. Specifically, in the configuration of the communication apparatus shown in FIG. 5 or FIG. 11, an operation when the information device 84 having a high priority such as an IP telephone is turned on / off by the detection unit 31 of the HGW 93 will be described. The HGW 93 detects the on / off information of the IP telephone connected to the HGW 93 in the detection unit 31 shown in FIG.

  The sleep / startup determination unit 33 transmits a control signal including information related to the timing at which the ONU 92 enters sleep or start-up based on on / off information of the information device detected by the detection unit 31. For example, the detection unit 31 detects on / off information of the VoIP 841 that is an IP phone.

The operation from the start of use of VoIP 841 until the state is notified to the sleep / activation determination unit 33 in the present invention will be described with reference to the flowchart shown in FIG.
The detection unit 31 of the HGW 93 detects ON / OFF information of the information device 84 that sends the high priority frame (S301). If the information is ON (Yes in S302), the monitoring unit 32 is in the ON state. This is notified to the sleep / startup determination unit 33 (S303), and information about the power supply control timing is transmitted to the ONU 92 using those information.
On the other hand, when the detection information is in the OFF state (No in S302), the information is similarly notified to the sleep / startup determination unit 33 (S304), and the power supply control timing is sent to the ONU 92 using the information. Notify information about.

  In this embodiment, traffic inflow from a high-priority IP phone can be detected before information such as a SIP session, so the control signal is transmitted to the ONU 92 earlier, thereby shortening the command processing time. The power saving effect can be improved by extending the sleep time. Further, by directly detecting the on / off information from the IP phone, the processing time can be shortened and the delay time can be shortened.

  In the present embodiment, the control of the power supply timing to the ONU 92 using the on / off information of the information device 84 has been described. But it ’s okay. In addition, the IP telephone has been described as the information device 84 that sends a high priority frame. However, the present invention is not limited to this. To do.

(Embodiment 6)
Unlike the first embodiment, the second embodiment, and the fifth embodiment, the power supply control timing to the subscriber-side terminal device 82 is notified according to the information related to the operation state of the information equipment 84 connected to the subscriber-side gateway device 83. A method will be described.
In the present embodiment, a case will be described in which, in the configuration of the communication apparatus illustrated in FIG. 5 or FIG. 11, information related to the CPU operation rate is detected as the operation state of the PC connected to the HGW 93. This will be specifically described with reference to the flowchart shown in FIG.

First, the operation rate of the CPU in the PC 842 is detected, and the information is transmitted to the detection unit 31 of the HGW 93 using the control protocol LLDP or the like to grasp the operation state (S401). If the PC 842 is performing CPU processing such that effective traffic flows (Yes in S402), the monitoring unit 32 notifies the sleep / startup determination unit 33 that the operation state is continuing ( S403).
On the other hand, even when the PC 842 is not performing CPU processing such that effective traffic flows (No in S402), the monitoring unit 32 similarly does not continue the operation state to the sleep / startup determination unit 33. Is notified (S404). The detection state of the operation state of the information device 84 in the detection unit 31 is periodically performed.

  In the present embodiment, the operating state of the PC 842 connected to the HGW 93 is grasped based on the CPU operating rate, but other than that, it can be obtained from the NW connection status, download / upload operation status, and traffic monitoring. Information may be used. Further, as information related to the operating state of the information device 84, information obtained from a specific bundle for grasping information of the information device 84 connected to the HGW 93 is snooped using an application on OSGi installed in the HGW 93. The method is fine. Moreover, although the information regarding the operation state of the information apparatus 84 was grasped | ascertained using LLDP which is a control protocol, it is not restricted to this.

  In this embodiment, even when the power source of the PC 842 or the like is activated, for example, when the PC 842 is in the sleep state or when the moving image is being streamed, the operation state is detected and the power supply control to the ONU 92 is performed. By notifying the timing, even when there is an operation state in which effective traffic does not flow from the information device 84, the sleep time of the ONU 92 is extended by transmitting the appropriate sleep / startup information from the HGW 93, thereby saving power. The effect can be improved.

(Embodiment 7)
In the present embodiment, unlike Embodiments 5 and 6, a case will be described in which log information related to the use of the information device 84 is used in the subscriber-side gateway device 83. As shown in FIG. 17, the monitoring unit 32 is different in that it includes an analysis unit 321, a memory 322, and a clock 323. The memory 322 accumulates log information related to use of the information device 84 connected to the HGW 93.

A specific operation in the present embodiment will be described.
The detecting unit 31 detects the usage status of the information device 84 and writes the log information in the memory 322 in synchronization with the clock 323 in the monitoring unit 32. For example, as a method for grasping the usage status of the information device 84, time information and the like are acquired using the clock 323, and the usage status of the information device 84 for each day of the week and date is written in the memory 322 together with the output information of the clock.
Based on the information recorded in the memory 322, the analysis unit 321 analyzes the date and time output by the clock 323 and the usage pattern of the information device 84 for each day of the week, and according to the extracted usage pattern of the information device 84 Then, the extracted information is notified to the sleep / activation determination unit 33.
The sleep / activation determination unit 33 transmits information related to the power supply control timing to the ONU 92 based on the notified extracted information.

  For example, the analysis unit 321 uses the information device 84 less frequently on weekdays from 0:00 to 20:00, and uses the information device 84 frequently between 21:00:00 and 23:00. Log information is extracted. Then, the analysis unit 321 notifies the sleep / startup determination unit 33 of the log information as extraction information in accordance with the date and time extracted by the clock 323. The sleep / startup determination unit 33 transmits a control signal instructing sleep to the ONU 92 at 0:00 on weekdays using the log information.

  If VoIP 841 is used between 00:00 and 20:00 on weekdays, the analysis unit 321 notifies the sleep / startup determination unit 33 of the information as extracted information. The sleep / startup determination unit 33 transmits a control signal instructing start-up to the ONU 92 based on the information. In the present embodiment, the power supply control to the ONU 92 is performed according to the usage pattern of the information device 84 for each user who owns the HGW 93. Therefore, the sleep time can be extended, and the power saving efficiency of the ONU 92 can be improved. I can do it.

  The present invention can be applied to the information communication industry.

21: Sleep / startup determination unit 22: Signal processing unit 23: Queue storage unit 24: PHY
25: TRx
31: Detection unit 32: Monitoring unit 321: Analysis unit 322: Memory 323: Clock 33: Sleep / activation determination unit 34: Signal processing unit 35: Queue storage unit 36: PHY
37: Queue observation unit 38: Timer 82: Subscriber side termination device 83: Subscriber side gateway device 84: Information device 841: VoIP
842: PC
843: TV
91: OLT
92, 92 ₁ ... 92 _i ... 92 _n : ONU
93, 93 ₁ ... 93 _i ... 93 _n : HGW
94: Splitter 95: Optical fibers 96, 96 ₁ ... 96 _i ... 96 _n : UNI

Claims (11)

A subscriber-side gateway device connected to the subscriber-side termination device in an optical communication system in which a station-side termination device and a subscriber-side termination device are connected by a passive optical network,
A detection unit for detecting traffic information flowing in from an information device that transmits and receives information to and from the station-side terminal device;
A monitoring unit that monitors traffic information detected by the detection unit;
A queue accumulating unit for accumulating traffic from the information device;
An arrival interval of traffic flowing in from the information device is detected , the arrival interval is determined as a power supply control timing of the subscriber-side termination device, and a control signal indicating the power supply control timing of the subscriber-side termination device is A sleep / startup determining unit for notifying the person-side terminal device,
A signal processing unit for transmitting the traffic stored in the queue storage unit to the subscriber-side terminal device;
A subscriber-side gateway device. The queue accumulation unit accumulates traffic for a predetermined threshold time after traffic flows into the queue accumulation unit,
The sleep / wake-up determination unit is configured to determine whether the subscriber-side terminating device is based on an amount of traffic stored in the queue storage unit from when traffic enters the queue storage unit until the threshold time is reached . The subscriber-side gateway device according to claim 1, wherein power supply control timing is determined. The detection unit further detects the priority of traffic flowing in from the information device,
The monitoring unit further monitors the priority of the traffic detected by the detection unit,
3. The subscriber-side gateway according to claim 1, wherein the sleep / wake-up determination unit determines a power supply control timing of the subscriber-side termination device based on a priority identified by the monitoring unit. apparatus. The queue accumulating unit has one or more class-specific queues according to the priority of traffic,
A queue observation unit for observing the amount of traffic accumulated in the queue accumulation unit and the accumulation time for each of the class-specific queues;
The detection unit further detects the priority of traffic flowing in from the information device,
The monitoring unit further monitors the priority of the traffic detected by the detection unit,
The sleep / wake-up determination unit further determines the power supply control timing of the subscriber-side terminating device based on the traffic amount and accumulation time observed by the queue observation unit and the priority of the traffic. The subscriber-side gateway device according to claim 1. When the sleep / wakeup determination unit receives a notification from the queue observation unit that it has been accumulated in the high-priority class-specific queue among the class-specific queues, it quickly supplies power to the subscriber-side terminal device. To the effect, notify the subscriber side terminal device of a control signal to that effect,
The said signal processing part transmits the traffic accumulate | stored in the said high priority queue according to a class to the said subscriber side terminal apparatus immediately after the notification of the said control signal. Subscriber side gateway device. When the sleep / wakeup determination unit receives a notification from the queue observation unit that it has accumulated in a predetermined specific class queue among the class-specific queues, traffic flows into the specific class-specific queue. Then, after a certain time has elapsed, determine the power supply control timing of the subscriber-side termination device, and notify the subscriber-side termination device of a control signal to that effect,
When the signal processing unit receives the notification of the control signal, after a predetermined time has elapsed since the traffic flowed into the specific class-specific queue, the signal processing unit terminates the priority-level traffic of the specific class-specific queue at the subscriber-side termination. The subscriber-side gateway device according to claim 4, wherein the subscriber-side gateway device is transmitted to the device. When the sleep / activation determination unit receives a notification from the queue observation unit that it has been observed that it has accumulated in the high priority class queue and the low priority class queue of the class queue, Based on the amount of traffic accumulated in the high-priority class queue and the low-priority class queue, the power supply control timing of the subscriber-side terminating device is determined,
The signal processing unit collectively transmits traffic accumulated in the high-priority class queue and the low-priority class queue to the subscriber-side terminal device. The subscriber-side gateway device according to any one of 4 to 6. The detection unit further detects on / off information of the information device,
The monitoring unit further monitors on / off information of the information device detected by the detection unit,
The sleep / wake-up determination unit further determines power supply control timing of the subscriber-side termination device based on on / off information of the information device monitored by the monitoring unit. 8. The subscriber-side gateway device according to any one of 7 above. The detection unit further extracts information on the operating state of the information device,
The monitoring unit further monitors the operating state of the information device detected by the detection unit,
9. The sleep / activation determination unit further determines a power supply control timing of the subscriber-side termination device based on an operation state of the information device monitored by the monitoring unit. The subscriber side gateway apparatus in any one. The monitoring unit further analyzes the usage pattern of the information device based on the traffic information detected by the detection unit,
The sleep / wake-up determination unit further determines power supply control timing of the subscriber-side termination device based on usage pattern information of the information device analyzed by the monitoring unit. The subscriber-side gateway device according to any one of the above. Power saving method for subscriber side termination device using subscriber side gateway device connected to subscriber side termination device in optical communication system in which station side termination device and subscriber side termination device are connected by passive optical network Because
A detection procedure for detecting traffic information flowing into the subscriber gateway device from an information device that transmits / receives information to / from the station terminal device;
A monitoring procedure for monitoring traffic information detected by the detection procedure;
An arrival interval of traffic flowing in from the information device is detected , the arrival interval is determined as a power supply control timing of the subscriber-side termination device, and a control signal indicating the power supply control timing of the subscriber-side termination device is A sleep / startup determination procedure for notifying the user-side terminal device,
A traffic transmission procedure for transmitting traffic flowing in from the information device to the subscriber-side terminal device;
A power-saving method for a subscriber-side terminating device having the following in order.

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