JP7072358B2 - Optical communication device, optical communication method, optical communication program, and optical communication system - Google Patents

Description

The present invention is implemented in an optical communication device and an optical communication device, which are optical line termination devices on the communication carrier side, which perform optical communication with a subscriber line termination device, which is a plurality of optical line termination devices on the subscriber side, through an optical fiber. The present invention relates to an optical communication method, an optical communication program executed in the optical communication device, and an optical communication system including the optical communication device.

A PON (Passive Optical Network) system, which is an optical communication system, can provide an FTTH (Fiber To The Home) service. The PON system consists of an optical network unit (OLT), which is an optical communication device (also referred to as a "master station device") installed in a telecommunications carrier station building, and a plurality of subscribers (slave stations). Includes a plurality of subscriber line terminal units (ONUs) which are optical communication devices (also referred to as “slave station devices”), an optical fiber connecting them, and an optical splitter as an optical branching / coupling means. .. Examples of the PON system include a GE-PON (Gigabit Ethernet-Passive Optical Network) system, which is a method compliant with IEEE802.3, and an ITU standard G.I. 984. There is a GPON (Gigabit Passive Optical Network) system that is a method compliant with x. Here, Ethernet is a registered trademark of Xerox Corporation.

In the PON system, a communication method such as time division multiplexing, frequency division multiplexing, or wavelength division multiplexing is adopted between the OLT and a plurality of ONUs. In the case of a PON system using a time division multiplexing method, downlink communication from OLT to ONU (also referred to as "downlink communication") is performed by TDM (Time Division Multiplexing) method, and uplink communication from ONU to OLT is performed. (Also referred to as "uplink communication") is performed by a TDMA (Time Division Multiplexing Access) method. In uplink communication, data collision occurs when a plurality of ONUs transmit at the same time, so the OLT allocates a transmission permission time and a transmittable time length to each of the plurality of ONUs.

Dynamic bandwidth allocation (DBA) is widely used as a method of allocating a transmission permission time and a transmittable time length in order to improve the bandwidth utilization efficiency of uplink communication. The DBA is a traffic monitor based on the Strontium Reporting (SR) -DBA method, which allocates the bandwidth (upstream bandwidth) used for uplink communication using the transmission permission request from the ONU, and the fixed bandwidth allocation (FBA). There is a Non-Status Reporting (NSR) -DBA method that allocates an uplink band using information such as.

Band allocation in the SR-DBA method includes the following steps (A1) to (A5). In this method, since the transmission permission amount of each ONU can be accurately grasped, high bandwidth utilization efficiency can be obtained.
(A1) The ONU makes a band request by notifying the OLT of the amount of uplink data stored in the own device in a batch (ONU unit) or an LLID (Logical Link ID) unit using a REPORT frame.
(A2) The OLT receives the REPORT frame to grasp the amount of uplink data stored in each ONU.
(A3) The OLT calculates the uplink band (transmission start time and transmission permission time) to be given to the ONU based on the accumulated data amount of the ONU notified in the REPORT frame and the band used by another ONU (or LLID). do.
(A4) The OLT stores the value calculated in the step (A3) in the GATE frame as the band allocation result and transmits it to the ONU.
(A5) The ONU transmits uplink data at a designated time according to the band allocation result stored in the received GATE frame.

Band allocation in the NSR-DBA method includes the following steps (B1) to (B5).
(B1) The OLT fixedly allocates a fixed amount of uplink band to each ONU in advance.
(B2) The OLT monitors the amount of upstream traffic.
(B3) The OLT calculates the uplink band (transmission start time and transmission permission time) to be allocated to each ONU based on the traffic volume monitored in the step (B2).
(B4) The OLT stores the value calculated in the step (B3) in the GATE frame as the band allocation result and transmits it to the ONU.
(B5) The ONU transmits uplink data at a designated time according to the band allocation result stored in the received GATE frame.

A method of allocating bandwidth according to a control schedule has been proposed (see, for example, Patent Document 1). The OLT of Patent Document 1 extracts a traffic fluctuation cycle from traffic information collected from a plurality of ONUs, and divides the extracted fluctuation cycle into time slots. The OLT of Patent Document 1 calculates the bandwidth allocation amount based on the traffic amount for each time slot, and allocates the bandwidth to a plurality of ONUs according to the control schedule based on the bandwidth allocation amount.

Japanese Unexamined Patent Publication No. 2016-220033

By the way, the ONU frequently transmits the state information indicating the state of the ONU to the OLT. When the OLT receives the state information, the OLT uses the state information to execute the state determination process of the ONU that has transmitted the state information. Since the OLT frequently receives the state information from the ONU and frequently executes the state determination process, the processing load of the OLT increases.

An object of the present invention is to reduce the processing load of an optical communication device (OLT).

An optical communication device according to one aspect of the present disclosure is provided. The optical communication device, which is the master station side optical line termination device that communicates with the slave station device, which is the slave station side optical line termination device, using an optical fiber is a monitoring unit that monitors the traffic volume of data received from the slave station device. The band allocation calculation unit that determines the uplink band to be allocated to the upstream data transmission from the slave station device to the optical communication device based on the traffic volume, and the band allocation amount corresponding to the uplink band are equal to or larger than the threshold value. In the case of the above, and when a preset time has elapsed since the previous determination to cause the slave station device to transmit the state information indicating the state of the slave station device to the optical communication device. A transmission control unit that causes the slave station device to transmit the data excluding the state information and the state information to the optical communication device using the uplink band without transmitting the state information to the optical communication device. And have.

According to the present invention, the processing load of the optical communication device can be reduced.

It is a figure which shows the PON system which is the optical communication system which concerns on Embodiment 1. FIG. It is a figure which shows the hardware structure of the OLT of Embodiment 1. FIG. It is a functional block diagram of OLT of Embodiment 1. FIG. It is a figure which shows the format of the GATE frame of Embodiment 1. FIG. It is a figure which shows the format of the REPORT frame of Embodiment 1. FIG. It is a flowchart which shows the transmission setting determination process of the REPORT frame of Embodiment 1. FIG. It is a figure which shows the comparative example of the transmission control of the REPORT frame of Embodiment 1. FIG. It is a flowchart which shows the transmission setting determination process of the REPORT frame of Embodiment 2. It is a functional block diagram of the OLT of Embodiment 3. It is a flowchart which shows the transmission setting determination process of the REPORT frame of Embodiment 3. It is a functional block diagram of the OLT of Embodiment 4. It is a flowchart (the 1) which shows the transmission setting determination process of the REPORT frame of Embodiment 4. FIG. 2 is a flowchart (No. 2) showing a transmission setting determination process of the REPORT frame of the fourth embodiment. It is a figure (the 1) which shows the specific example of the transmission setting determination processing of the REPORT frame of Embodiment 4. FIG. 2 is a diagram (No. 2) showing a specific example of the transmission setting determination process of the REPORT frame of the fourth embodiment.

Hereinafter, the OLT, the optical communication method, the optical communication program, and the optical communication system, which are optical communication devices according to the embodiment of the present invention, will be described with reference to the drawings. The following embodiments are merely examples, and various modifications can be made within the scope of the present invention.

Embodiment 1.
FIG. 1 is a diagram showing a PON system which is an optical communication system according to the first embodiment.

The PON system 1, which is an optical multi-branch communication system capable of realizing an FTTH service, includes an optical network unit (OLT) 100, which is an optical communication device (master station device) installed in a communication operator station building 2. A plurality of subscriber line terminal devices (ONU) 200_1, ..., 200_n, which are a plurality of subscriber-side optical communication devices (slave station devices) installed in a plurality of subscriber facilities 3_1, ..., 3_n, and these are used for optical communication. It is an optical communication system including an optical fiber 310, 320_1, ..., 320_n and an optical splitter 300 as an optical branching / coupling means to be connected so as to be possible. Here, n is a positive integer. The telecommunications carrier station building 2 may be provided with an operation terminal 400 for operating the OLT 100. The plurality of subscriber equipments 3_1, ..., 3_n may include user terminals 500_1, ..., 500_n connected to ONU200_1, ..., 200_n.

Any one of the plurality of subscriber equipments 3_1, ..., 3_n is referred to as subscriber equipment 3_i. i is an integer of 1 or more and n or less. Further, any one of the plurality of ONU200_1, ..., 200_n is referred to as ONU200_i, and any one of the optical fibers 320_1, ..., 320_n is referred to as an optical fiber 320_i.

The upper network 600 is a network connected to a communication device of another telecommunications carrier station building. The upper network 600 and the OLT 100 are connected via a connection cable for transmitting and receiving electrical signals. A higher-level device such as a device connected to the higher-level network 600 or a device of another telecommunications carrier station building is connected to the user terminal 500_i through a connection cable, an OLT100, an optical fiber 310, an optical splitter 300, an optical fiber 320_i, and an ONU200_i. Provide communication services.

The operation terminal 400 is a terminal that sets and monitors the status of the OLT100 or ONU200_i according to the content of the service. The OLT 100 and the operation terminal 400 are connected via a connection cable.
The user terminals 500_1, ..., 500_n transmit data to ONU200_1, ..., 200_n. ONU200_1, ..., 200_n transmit the received data to the OLT100. The data received by ONU200_1, ..., 200_n from the user terminals 500_1, ..., 500_n is expressed as user data.

The optical fiber 310 is a trunk optical fiber as an optical transmission line connecting the OLT 100 and the optical splitter 300.

The optical fibers 320_1, ..., 320_n are optical transmission lines connecting a plurality of optical transmission lines on the branch path side of the optical splitter 300 and a plurality of ONU200_1, ..., 200_n, respectively. That is, the optical splitter 300 and the ONU200_i are connected by an optical fiber 320_i.

In the PON system 1, a plurality of ONU200_1, ..., 200_n are connected to one OLT 100. When ONU200_1, ..., 200_n simultaneously transmit user data to the OLT 100, a data collision occurs. Therefore, the OLT 100 controls ONU200_1, ..., 200_n so that each of ONU200_1, ..., 200_n transmits user data at different times. That is, the OLT 100 uses, for example, a time division multiple access (TDMA) to control each ONU so that each of the ONUs 200_1, ..., 200_n transmits user data at different times. For example, the OLT 100 determines a transmission permission time at which each of ONU200_1, ..., 200_n permits the OLT 100 to transmit user data.

The OLT 100 registers the transmission permission time determined for ONU200_i (i = 1, 2, ..., N) in the GATE frame described later, and transmits the GATE frame to the ONU200_i. As a result, ONU200_1, ..., 200_n can refer to the transmission permission time and confirm the time when the transmission of the user data is started.

The ONUs 200_1, ..., 200_n transmit a REPORT frame including status information indicating the status of each ONU to the OLT100. For example, the ONU200_i transmits a REPORT frame including status information indicating the status of the ONU200_i to the OLT 100. The REPORT frame is different from the REPORT frame for requesting the band of the SR-DBA method.
The timing at which ONU200_1, ..., 200_n transmits the REPORT frame to the OLT100 is the transmission permission time registered in the GATE frame. That is, ONU200_1, ..., 200_n transmit the user data and the REPORT frame to the OLT 100 at the transmission permission time registered in the GATE frame. For ONU200_1, ..., 200_n, if the transmission of the REPORT frame is completed by the time the transmission of the user data to the OLT 100 is completed, the REPORT frame must not be transmitted at the same time together with the user data at the transmission permission time. May be good. Further, ONU200_1, ..., 200_n may not transmit the REPORT frame to the OLT100 at the transmission permission time registered in the GATE frame. The case where the REPORT frame is not transmitted to the OLT100 will be described later.

Next, the hardware of the OLT100 will be described. FIG. 2 is a diagram showing a hardware configuration of the OLT according to the first embodiment. The OLT 100 has a processor 101, a volatile storage device 102, a non-volatile storage device 103, and a communication interface 104.

The processor 101 controls the entire OLT 100. For example, the processor 101 may be a CPU (Central Processing Unit) or an FPGA (Field Programmable Gate Array). The processor 101 may be a combination of a CPU and an FPGA.

The volatile storage device 102 is the main storage device of the OLT 100. For example, the volatile storage device 102 is a RAM (Random Access Memory). The non-volatile storage device 103 is an auxiliary storage device of the OLT 100. For example, the non-volatile storage device 103 is an HDD (Hard Disk Drive) or an SSD (Solid State Drive).

The communication interface 104 communicates with ONU200_1, ..., 200_n via the optical splitter 300. Further, the communication interface 104 is connected to the upper network 600.

Next, the function of the OLT 100 will be described. FIG. 3 is a functional block diagram of the OLT of the first embodiment. The OLT 100 has an upper transmission / reception unit 110, a lower transmission / reception unit 120, a monitoring unit 130, a bandwidth allocation calculation unit 140, a bandwidth allocation control unit 150, a transmission control unit 160, and a state monitoring unit 170. The upper transmission / reception unit 110 and the lower transmission / reception unit 120 can be implemented by the communication interface 104. The monitoring unit 130, the bandwidth allocation calculation unit 140, the bandwidth allocation control unit 150, the transmission control unit 160, and the condition monitoring unit 170 may be implemented by the processor 101 or may be implemented by a plurality of processors 101. The upper transmission / reception unit 110, the lower transmission / reception unit 120, the monitoring unit 130, the bandwidth allocation calculation unit 140, the bandwidth allocation control unit 150, the transmission control unit 160, and the condition monitoring unit 170 are implemented as modules of a program executed by the processor 101, for example. You may.

The upper transmission / reception unit 110 is connected to the upper network 600. The lower transmission / reception unit 120 communicates with ONU200_1, ..., 200_n via the optical splitter 300. Further, the lower transmission / reception unit 120 transmits the GATE frame created by the band allocation control unit 150 to ONU200_1, ..., 200_n. Further, the lower transmission / reception unit 120 receives the REPORT frame from ONU200_1, ..., 200_n. The lower transmission / reception unit 120 provides the REPORT frame to the condition monitoring unit 170.

The monitoring unit 130 monitors the amount of data communication traffic from ONU200_1, ..., 200_n to the OLT100. Data communication from ONU200_1, ..., 200_n to OLT100 is referred to as uplink communication. The bandwidth allocated for uplink communication is called the uplink band. Further, data communication from OLT100 to ONU200_1, ..., 200_n is called downlink communication.

The band allocation calculation unit 140 periodically calculates the uplink band to be allocated to each of the ONU200_1, ..., 200_n based on the amount of uplink communication traffic of the data transmitted from the ONU200_1, ..., 200_n to the lower transmission / reception unit 120. .. Further, the band allocation calculation unit 140 uses TDMA to determine the transmission permission time.

The band allocation control unit 150 generates a GATE frame including a transmission permission time and an uplink band. The transmission control unit 160 determines whether or not to transmit the REPORT frame to each of ONU200_1, ..., 200_n at the transmission permission time. The determination of whether or not to transmit the REPORT frame will be described in detail later. The transmission control unit 160 registers in the GATE frame whether or not to transmit the REPORT frame at the transmission permission time for each of ONU200_1, ..., 200_n. The band allocation control unit 150 causes the lower transmission / reception unit 120 to transmit a GATE frame to each of ONU200_1, ..., 200_n. The lower transmission / reception unit 120 transmits a GATE frame to ONU200_1, ..., 200_n via an optical fiber 310, an optical splitter 300, and an optical fiber 320_1, ..., 320_n, respectively.

The condition monitoring unit 170 acquires a REPORT frame from the lower transmission / reception unit 120. The state monitoring unit 170 executes the state determination process using the state information included in the REPORT frame.

Next, the GATE frame will be described. FIG. 4 is a diagram showing the format of the GATE frame of the first embodiment. The GATE frame includes "Grant start time" and "Grant Length". The “Grant start time” is a time when the start of transmission is permitted, that is, a transmission permission time. “Grant Length” is a bandwidth allocation amount corresponding to the uplink, that is, a bandwidth allocation amount for uplink communication used by the ONU. For example, "Grant # i Lentth" (i = 1, 2, ..., N) corresponds to the upstream band allocated for transmitting data to the OLT 100 at the transmission permission time indicated by "Grant # i Start time". Bandwidth allocation to be done. Note that FIG. 4 illustrates the case where n = 4. Further, for example, when the uplink band is 0 to 10 Mbps, the band allocation amount is 10 Mbps.

The OLT 100 transmits a GATE frame to each of ONU200_1, ..., 200_n. ONU200_1, ..., 200_n refer to "Grant start time" and "Grant Lent", and confirm the timing of transmitting user data to the OLT 100 and the bandwidth allocation amount.

The combination of "Grant start time" and "Grant Length" is called Grant. For example, the combination of "Grant # i Start time" and "Grant # i Length" is called Grant # i.

The GATE frame also includes a Grant number flag, i.e., NumGrt / Flag (1 byte). In the example of FIG. 4, the number of Grants (Number of Grants) is one of 0, 1, 2, 3, and 4. NumGrt / Flag includes "Force Report Grant". When the value of "Force Report Grant" is 0, it means that the transmission of the REPORT frame is invalid. When the value of "Force Report Grant" is 1, it means that the transmission of the REPORT frame is valid.

Grant # i and "Force Report Grant # i" have a corresponding relationship. Then, whether or not to transmit the REPORT frame to the OLT 100 in "Grant # i Start time" is determined by the value of "Force Report Grant # i".

ONU200_1, ..., 200_n refer to "Grant start time" and "Grant Length", confirm the value of "Force Report Grant", and determine whether or not to transmit the REPORT frame to the OLT100. For example, ONU200_1 refers to “Grant # 2 start time” and confirms the transmission permission time. ONU200_1 refers to "Force Report Grant # 2" and confirms whether or not to transmit the REPORT frame to the OLT100. When the value of "Force Report Grant # 2" is 1, the ONU200_1 transmits the user data and the REPORT frame to the OLT100 at the transmission permission time. When the value of "Force Report Grant # 2" is 0, ONU200_1 transmits the user data to the OLT100 at the transmission permission time, and does not transmit the REPORT frame to the OLT100.

Next, the REPORT frame will be described. FIG. 5 is a diagram showing the format of the REPORT frame of the first embodiment. The REPORT frame contains a "Report bit Map" (1 byte). "Report bit Map" includes Queue # 0 to Queue # 7. Queue # 0 to Queue # 7 are state information.

The state monitoring unit 170 refers to the REPORT frame and executes the state determination process of the ONU200_i that has transmitted the REPORT frame. For example, the state monitoring unit 170 executes a state determination process of whether or not any one of Queue # 0 to Queue # 7 is 1.

Next, the process executed by the OLT 100 will be described with reference to a flowchart. FIG. 6 is a flowchart showing a transmission setting determination process of the REPORT frame of the first embodiment. Further, FIG. 6 describes the REPORT frame transmission setting determination process performed by the OLT 100 for the ONU200_i (i = 1, 2, ..., N). The OLT 100 can also execute the REPORT frame transmission setting determination process for a plurality of ONUs in the same manner.

(Step S11) The band allocation calculation unit 140 performs fixed band allocation. For example, the band allocation calculation unit 140 determines the value obtained by dividing the maximum allocatable uplink band by the number of ONUs as the uplink band to be allocated to the ONU200_i. The band allocation calculation unit 140 determines the transmission permission time so that data collision does not occur. The band allocation calculation unit 140 generates a GATE frame. Different transmission permission times are registered in the "Grant start time" of Grant # 1 to Grant # 4. In "Grant Length" of Grant # 1 to Grant # 4, the bandwidth allocation amount corresponding to the uplink band allocated to ONU200_i is registered. The band allocation control unit 150 transmits the GATE frame to the lower transmission / reception unit 120. The lower transmission / reception unit 120 transmits a GATE frame to the ONU200_i. In addition, 1 may be set in "Force Report Grant # 1" to "Force Report Grant # 4" of the GATE frame.

The ONU200_i transmits user data to the OLT 100 based on the GATE frame received from the OLT 100. When 1 is set in "Force Report Grant # 1" to "Force Report Grant # 4", ONU200_i transmits the user data and the REPORT frame to the OLT100.
The monitoring unit 130 monitors the amount of uplink communication traffic.

(Step S12) The band allocation calculation unit 140 ends the monitoring after a predetermined time has elapsed from the start of the monitoring. The predetermined time is a predetermined time. The band allocation calculation unit 140 determines a plurality of transmission permission times and an uplink band to be allocated to ONU200_i based on the monitoring result. For example, the band allocation calculation unit 140 uses the NSR-DBA method to determine a plurality of transmission permission times and an uplink band to be allocated to ONU200_i. Specific examples of the NSR-DBA method are described above as background techniques.

The band allocation calculation unit 140 may determine a plurality of transmission permission times and an uplink band to be allocated to ONU200_i by the following method. The bandwidth allocation calculation unit 140 detects the periodicity of the change pattern of the traffic amount from the monitoring result. Further, the bandwidth allocation calculation unit 140 compares the change pattern of a plurality of traffic volumes stored in advance with the change pattern of the traffic volume within the monitoring period, and when the correlation coefficient is the maximum, the change pattern of the traffic volume Periodicity may be detected. The band allocation calculation unit 140 predicts the amount of data transmitted by ONU200_i to the OLT100 from the periodicity of the change pattern of the traffic amount, and determines the upstream band based on the predicted data amount. The band allocation calculation unit 140 determines a plurality of transmission permission times based on the periodicity of the change pattern of the traffic amount. When determining the transmission permission time, the band allocation calculation unit 140 determines the transmission permission time so that data collision does not occur.

Further, when the bandwidth allocation calculation unit 140 tends to increase or decrease the traffic volume from the monitoring result, the band allocation calculation unit 140 may determine a plurality of transmission permission times and the uplink band to be allocated to ONU200_i based on the tendency. For example, the bandwidth allocation calculation unit 140 refers to the monitoring result and detects that the traffic volume tends to increase from the start of monitoring to a certain time. The bandwidth allocation calculation unit 140 detects that the traffic volume tends to decrease from that time to the end of monitoring. The band allocation calculation unit 140 determines a plurality of transmission permission times and an uplink band to be allocated to ONU200_i based on the tendency that the traffic volume increases until a certain time in the monitoring period and the traffic volume decreases from that time.

(Step S13) The band allocation control unit 150 generates a GATE frame. The band allocation control unit 150 registers the plurality of transmission permission times determined in step S12 and the band allocation amount corresponding to the uplink band assigned to ONU200_i in the GATE frame. As a result, a plurality of transmission permission times and a bandwidth allocation amount corresponding to the uplink band allocated to ONU200_i are registered in the "Grant start time" and "Grant Lent" of Grant # 1 to # 4 of the GATE frame. To.

(Step S14) The transmission control unit 160 selects one Grant. The transmission control unit 160 acquires the “Grant Length” of the selected Grant. For example, the transmission control unit 160 selects Grant # 1 and acquires “Grant # 1 Language of Grant # 1”.

The transmission control unit 160 compares the acquired “Grant Length” with the threshold value. In the case of "Grant Length ≥ threshold value" (No in step S14), the transmission control unit 160 determines that the upstream band is frequently used. Then, the transmission control unit 160 advances the process to step S15. In the case of "Grant Length <threshold value" (Yes in step S14), the transmission control unit 160 determines that the upstream band is not used very much. Then, the transmission control unit 160 advances the process to step S16.

(Step S15) The transmission control unit 160 sets invalidity in the “Force Report Grant” corresponding to the “Grant Lent” acquired in step S14. For example, when the transmission control unit 160 acquires “Grant # 1 Length” in step S14, the transmission control unit 160 sets “Force Report Grant # 1” to be invalid. That is, the transmission control unit 160 causes the ONU200_i to transmit data (user data) excluding the state information using the band allocated to the ONU200_i without transmitting the REPORT frame containing the state information to the OLT100. .. Then, the transmission control unit 160 advances the process to step S17.

(Step S16) The transmission control unit 160 sets valid for the “Force Report Grant” corresponding to the “Grant Lent” acquired in step S14. For example, when the transmission control unit 160 acquires “Grant # 1 Length” in step S14, the transmission control unit 160 sets “Force Report Grant # 1” to be valid.

(Step S17) The transmission control unit 160 determines whether or not the determination in step S14 has been executed by using the “Grant Length” of Grant # 1 to # 4.

When the determination in step S14 is executed using the “Grant Length” of Grant # 1 to # 4 (Yes in step S17), the transmission control unit 160 advances the process to step S18. When the determination in step S14 is not executed using any of the "Grant Length" of Grant # 1 to # 4 (No in step S17), the transmission control unit 160 advances the process to step S14.

(Step S18) The band allocation control unit 150 transmits a GATE frame to the lower transmission / reception unit 120. The lower transmission / reception unit 120 transmits a GATE frame to the ONU200_i.

As a result, the ONU200_i can confirm the timing of transmitting the user data to the OLT 100 by referring to the GATE frame. Further, ONU200_i can confirm whether or not to transmit the REPORT frame to the OLT100 by referring to the GATE frame.

(Step S19) The monitoring unit 130 continues to monitor the traffic volume of uplink communication. The monitoring unit 130 advances the process to step S12.
Further, when the monitoring unit 130 detects the periodicity of the change pattern of the traffic amount, that is, when it is detected that the same change pattern is repeated at a constant cycle, the monitoring unit 130 stops the continuation of the monitoring of the traffic amount. May be good.

FIG. 7 is a diagram showing a comparative example of transmission control of the REPORT frame of the first embodiment. FIG. 7A shows that the ONU 800 periodically transmits REPORT frames.
(Step S101) The OLT 700 transmits a GATE frame to the ONU 800.
(Step S102) The ONU 800 transmits user data to the OLT 700 using the uplink band registered in the GATE frame.
(Step S103) Since it is time to transmit the REPORT frame, the ONU 800 transmits the REPORT frame to the OLT 700.
(Step S104) The OLT 700 transmits a GATE frame to the ONU 800.
(Step S105) The ONU 800 transmits user data to the OLT 700 using the uplink band registered in the GATE frame.
(Step S106) Since it is time to transmit the REPORT frame, the ONU 800 transmits the REPORT frame to the OLT 700.

The ONU 800 may transmit a REPORT frame to the OLT 700 before transmitting the user data. The ONU 800 does not transmit the user data and the REPORT frame to the OLT 700 at the same time.
In this way, the OLT 700 periodically receives the REPORT frame including the state information. That is, the OLT 700 frequently receives state information from the ONU 800. Since the OLT 700 frequently receives the state information from the ONU 800 and frequently executes the state determination process, the processing load of the OLT 700 increases.

Therefore, in the first embodiment, in the case of "Grant Length ≥ threshold value", the OLT 100 does not cause the ONU200_i to transmit the REPORT frame including the state information to the OLT100, and uses the band allocated to the ONU200_i to transmit the user data. Send to OLT100. That is, the OLT 100 causes the ONU200_i to transmit data (user data) excluding the state information using the band allocated to the ONU200_i without transmitting the state information to the OLT100.
FIG. 7B shows that there is a case where only the user data is transmitted to the OLT 100 without transmitting the REPORT frame to the OLT 100.
(Step S111) The OLT 100 transmits a GATE frame to the ONU200_1.
(Step S112) ONU200_1 refers to the Grant # 1 start time registered in the GATE frame, and confirms the transmission permission time. ONU200_1 confirms that "Force Report Grant # 1" is invalid. The ONU200_1 transmits only the user data to the OLT100 at the transmission permission time.

By executing step S15, the OLT 100 can reduce the chance that the ONU200_i transmits a REPORT frame to the OLT 100. The OLT 100 reduces the chances of the ONU200_i transmitting the REPORT frame to the OLT 100, thereby reducing the chance of receiving the REPORT frame. Since the chance of receiving the REPORT frame is reduced, the OLT 100 is less likely to execute the state determination process using the state information included in the REPORT frame, so that the processing load of the OLT 100 can be reduced.
Therefore, according to the first embodiment, the OLT 100 can reduce the processing load of the OLT 100.

Further, in the case of "Grant Length <threshold value", the OLT 100 causes the ONU200_i to transmit the user data and the REPORT frame to the OLT100 using the band allocated to the ONU200_i. That is, the OLT 100 can improve the utilization efficiency of the uplink band by causing the ONU200_i to transmit the REPORT frame and the user data to the OLT 100 during the period when the uplink band usage is low.

Embodiment 2.
Next, the second embodiment will be described. The matters different from the above-described first embodiment will be mainly described, and the common matters will be omitted. The PON system 1 which is the optical communication system of the second embodiment is different from the PON system 1 of the first embodiment in the operation of the OLT 100, but the PON system 1 of the first embodiment is different from the PON system 1 of the first embodiment. Is the same as. The configuration of the functional block of the second embodiment is the same as the configuration of the functional block of the first embodiment. Therefore, in the description of the second embodiment, FIGS. 1 to 3 are also referred to.

FIG. 8 is a flowchart showing a transmission setting determination process of the REPORT frame of the second embodiment. FIG. 8 is different from FIG. 6 in that the OLT 100 executes steps S14a and 14b. Therefore, in FIG. 8, steps S14a and 14b will be described, and the other steps will be assigned the same numbers as the step numbers in FIG. 6, so that the description of the process will be omitted.

Further, FIG. 8 describes the REPORT frame transmission setting determination process performed by the OLT 100 for the ONU200_i.

(Step S14a) The transmission control unit 160 selects one Grant. The transmission control unit 160 acquires the “Grant Length” of the selected Grant.

The transmission control unit 160 compares the acquired “Grant Length” with the threshold value. In the case of "Grant Length ≥ threshold value" (No in step S14a), the transmission control unit 160 determines that the upstream band is frequently used. Then, the transmission control unit 160 advances the process to step S14b. In the case of "Grant Length <threshold value" (Yes in step S14a), the transmission control unit 160 determines that the upstream band is not used much. Then, the transmission control unit 160 advances the process to step S16.

(Step S14b) The transmission control unit 160 has set the "Force Report Grant" to be valid within the time L (within the time L since the last execution of step S16), that is, the latest valid setting. It is determined whether or not the elapsed time from the time is within the time L. The information of the time L is a threshold time stored in advance in the volatile storage device 102 or the non-volatile storage device 103. The time L is a time that can be arbitrarily set according to the specifications, performance, and the like required for the optical communication system.

If it is within the time L (Yes in step S14b) since the last time when the "Force Report Grant" was set to be valid, the transmission control unit 160 advances the process to step S15. When the time L has elapsed since the last time when the "Force Report Grant" was set to be valid (No in step S14b), the transmission control unit 160 advances the process to step S16.
That is, in step S14, the transmission control unit 160 determines whether or not time L has elapsed since the ONU200_i was previously determined to transmit the state information to the OLT100. If it is within time L (Yes in step S14b) since the ONU200_i was previously determined to transmit the state information to the OLT 100, the transmission control unit 160 advances the process to step S15. When the time L has elapsed since the ONU200_i was previously determined to transmit the state information to the OLT 100 (No in step S14b), the transmission control unit 160 advances the process to step S16.

As described above, when the time L has elapsed since the last time the valid was set in the "Force Report Grant", the OLT 100 sets the valid in the "Force Report Grant". As a result, the OLT 100 can avoid the situation where the REPORT frame cannot be received from the ONU200_i for a long time.

Embodiment 3.
The matters different from the above-described first embodiment will be mainly described, and the common matters will be omitted. The PON system 1 which is the optical communication system of the third embodiment is different from the PON system 1 of the first embodiment in the operation of the OLT100a, but is the same as the PON system 1 of the first embodiment in other points. Is. Therefore, in the description of the third embodiment, FIGS. 1 and 2 will be referred to.

FIG. 9 is a functional block diagram of the OLT of the third embodiment. The lower transmission / reception unit 120a of the third embodiment has a new function added to the function of the lower transmission / reception unit 120 of the first embodiment.

The lower transmission / reception unit 120a receives a REPORT frame from ONU200_1, ..., 200_n. The lower transmission / reception unit 120a notifies the transmission control unit 160a that the REPORT frame has been received.

FIG. 10 is a flowchart showing a transmission setting determination process of the REPORT frame of the third embodiment. FIG. 10 differs from FIG. 6 in that the OLT 100a executes steps S14c and 14d. Therefore, in FIG. 10, steps S14c and 14d will be described, and the other steps will be assigned the same numbers as the step numbers in FIG. 6, so that the description of the process will be omitted.

Further, FIG. 10 describes the REPORT frame transmission setting determination process performed by the OLT100a for the ONU200_i.

(Step S14c) The transmission control unit 160a selects one Grant. The transmission control unit 160a acquires the “Grant Length” of the selected Grant.

The transmission control unit 160a compares the acquired “Grant Length” with the threshold value. In the case of "Grant Length ≥ threshold value" (No in step S14c), the transmission control unit 160a determines that the upstream band is frequently used. Then, the transmission control unit 160a advances the process to step S14d. In the case of "Grant Length <threshold value" (Yes in step S14c), the transmission control unit 160a determines that the upstream band is not used much. Then, the transmission control unit 160a advances the process to step S16.

(Step S14d) The transmission control unit 160a determines whether or not the lower transmission / reception unit 120a is within time L since the last time the REPORT frame was received from ONU200_i (within time L since the last time the REPORT frame was received immediately before). do. The time L is a threshold time similar to that described in the second embodiment.

When the REPORT frame is received from ONU200_i last time within the time L (Yes in step S14d), the transmission control unit 160a advances the process to step S15. When the time L has elapsed since the previous reception of the REPORT frame from ONU200_i (No in step S14d), the transmission control unit 160a advances the process to step S16.

As described above, when the time L has elapsed since the last time the REPORT frame was received from the ONU200_i, the OLT100a sets the "Force Report Grant" to be valid. As a result, the OLT100a can avoid the situation where the REPORT frame cannot be received from the ONU200_i for a long time.

Embodiment 4.
Next, the fourth embodiment will be described. The matters different from the above-described first embodiment will be mainly described, and the common matters will be omitted. The configuration of the PON system 1 of the fourth embodiment is the same as the configuration of the PON system 1 of the first embodiment.

FIG. 11 is a functional block diagram of the OLT of the fourth embodiment. The OLT 100b of the fourth embodiment is obtained by adding the effective instruction position control unit 180 to the OLT 100b of the first embodiment. The effective instruction position control unit 180 may be implemented as a module of a program executed by the processor 101, for example.

The effective instruction position control unit 180 determines the timing at which the ONU200_1, ..., 200_n transmits the REPORT frame so that the OLT100b does not receive a large number of REPORT frames from the ONU200_1, ..., 200_n at a certain time zone. In the fourth embodiment, the case where n = 4 will be described.
FIG. 12 is a flowchart (No. 1) showing a transmission setting determination process of the REPORT frame of the fourth embodiment.

(Step S21) The band allocation calculation unit 140 allocates a fixed band to ONU200_1, ..., 200_4. The band allocation calculation unit 140 determines the transmission permission time so that data collision does not occur. The band allocation calculation unit 140 generates a GATE frame including a fixed band allocation amount and a transmission permission time. The lower transmission / reception unit 120 transmits a GATE frame to ONU200_1, ..., 200_4. A value of 1 may be set in "Force Report Grant # 1" to "Force Report Grant # 4" of the GATE frame.
The monitoring unit 130 monitors the traffic volume of each of ONU200_1, ..., 200_4 for uplink communication.

(Step S22) The band allocation calculation unit 140 ends the monitoring after a predetermined time has elapsed from the start of the monitoring. The band allocation calculation unit 140 determines the plurality of transmission permission times and the uplink band to be allocated to ONU200_1, ..., 200_4 by the method described in step S12. When determining the transmission permission time, the band allocation calculation unit 140 determines the transmission permission time so that data collision does not occur. Further, the band allocation calculation unit 140 sets the transmission permission time specified in ONU200_1, ..., 200_4 in the range of the time zone T. For example, the band allocation calculation unit 140 sets the transmission permission time designated for each ONU in the range of 10 minutes from 13:00 to 13:10. The information of the time zone T is stored in advance in the volatile storage device 102 or the non-volatile storage device 103. The time zone T is an arbitrary time zone.

(Step S23) The band allocation control unit 150 generates GATE frames for ONU200_1, ..., 200_4. For example, in the GATE frame for ONU200_1, a plurality of transmission permission times determined in step S22 and a band allocation amount corresponding to the upstream band assigned to ONU200_1 are registered.

As a result, the transmission permission time and the band allocation amount are registered in the "Grant start time" and "Grant Lent" of Grant # 1 to # 4 of the GATE frames for ONU200_1, ..., 200_4.

(Step S24) The transmission control unit 160 selects one GATE frame from the GATE frames for ONU200_1, ..., 200_4. The transmission control unit 160 selects one Grant from the selected GATE frames. The transmission control unit 160 acquires the “Grant Length” of the selected Grant.

The transmission control unit 160 compares the acquired “Grant Length” with the threshold value. In the case of "Grant Length ≥ threshold value" (No in step S24), the transmission control unit 160 determines that the upstream band is frequently used. Then, the transmission control unit 160 advances the process to step S25. In the case of "Grant Length <threshold value" (Yes in step S24), the transmission control unit 160 determines that the upstream band is not used very much. Then, the transmission control unit 160 advances the process to step S26.

(Step S25) The transmission control unit 160 sets invalidity in the “Force Report Grant” corresponding to the “Grant Lent” acquired in step S24. Then, the transmission control unit 160 advances the process to step S27.

(Step S26) The transmission control unit 160 sets valid for the “Force Report Grant” corresponding to the “Grant Length” acquired in step S24.

(Step S27) The transmission control unit 160 determines whether or not the determination in step S24 has been executed using the “Grant Length” of Grants # 1 to # 4 of the GATE frames for ONU200_1, ..., 200_4.

If the determination condition of step S27 is not satisfied (No in step S27), the transmission control unit 160 advances the process to step S24. When the determination condition of step S27 is satisfied (Yes in step S27), the transmission control unit 160 advances the process to step S31. Further, when the determination condition of step S27 is satisfied, valid or invalid is registered in the "Force Report Grant" corresponding to Grants # 1 to # 4 of the GATE frames for ONU200_1, ..., 200_4. It should be noted that the validity set in "Force Report Grant" corresponding to Grants # 1 to # 4 of the GATE frames for ONU200_1, ..., 200_1 is in a tentatively determined state.
FIG. 13 is a flowchart (No. 2) showing a transmission setting determination process of the REPORT frame of the fourth embodiment.

(Step S31) The effective instruction position control unit 180 divides the time zone T. The valid instruction position control unit 180 detects the number of ONUs for which valid is set for "Force Report Grant" in each divided section.

(Step S32) The valid instruction position control unit 180 determines whether or not there is a section in which the number of ONUs for which valid is set in the “Force Report Grant” is equal to or less than the allowable number. The permissible number of information is stored in advance in the volatile storage device 102 or the non-volatile storage device 103. The permissible number is any number.

When there are sections equal to or less than the allowable number (Yes in step S32), the valid instruction position control unit 180 advances the process to step S33. When there is no section less than the allowable number (No in step S32), the valid instruction position control unit 180 advances the process to step S37.

(Step S33) The valid instruction position control unit 180 confirms the validity of the “Force Report Grant” set in the ONU in the interval of the allowable number or less. Further, when the valid instruction position control unit 180 is set to be valid for a plurality of "Force Report Grants" corresponding to ONUs in the section less than the allowable number, the earliest "Force Report Grant" in the time series is effectively confirmed. Then, the other "Force Report Grant" in the section is invalidated. The valid instruction position control unit 180 invalidates the valid set in "Force Report Grant" in the other section of the ONU.

(Step S34) The valid instruction position control unit 180 determines whether or not the validity of the “Force Report Grant” is confirmed in all the sections divided in step S31. When the validity of "Force Report Grant" is confirmed in all sections (Yes in step S34), the valid instruction position control unit 180 advances the process to step S35. When the validity of "Force Report Grant" is not confirmed in any of the sections (No in step S34), the valid instruction position control unit 180 advances the process to step S32.

(Step S35) The band allocation control unit 150 transmits GATE frames for ONU200_1, ..., 200_4 to the lower transmission / reception unit 120. The lower transmission / reception unit 120 transmits a GATE frame for ONU200_1, ..., 200_4 to ONU200_1, ..., 200_4.

(Step S36) The monitoring unit 130 continues to monitor the traffic volume of each of ONU200_1, ..., 200_4 for uplink communication. The monitoring unit 130 advances the process to step S22.

(Step S37) The valid instruction position control unit 180 detects the number of valid settings for “Force Report Grant” in all sections for each ONU. The valid instruction position control unit 180 determines whether or not there is one ONU in the entire section in which the number for which valid is set for "Force Report Grant" is set. Further, the valid instruction position control unit 180 may determine whether or not there are a preset number of ONUs in the entire section in which the valid setting for the “Force Report Grant” is set.

When there is one ONU in all the sections in which the number of "Force Report Grant" set to be valid is one (Yes in step S37), the valid instruction position control unit 180 advances the process to step S38. When one ONU does not exist in all the sections in which the number of "Force Report Grant" set to be valid is one (No in step S37), the valid instruction position control unit 180 advances the process to step S39.

Further, the valid instruction position control unit 180 processes when there is one ONU in all sections in which the number of valid settings for the "Force Report Grant" is one, except for the ONU whose validity of the "Force Report Grant" is confirmed. To step S38.

(Step S38) The valid instruction position control unit 180 determines the validity of the “Force Report Grant” in which the number of valid settings in the “Force Report Grant” is set to one ONU in all sections. The valid instruction position control unit 180 changes the validity of the "Force Report Grant" set in the other ONU existing in the section where the validity is confirmed to be invalid. Then, the effective instruction position control unit 180 advances the process to step S34.

(Step S39) The valid instruction position control unit 180 preferentially determines the validity of the ONU names in ascending order. The name of the ONU includes a number. Further, the valid instruction position control unit 180 may preferentially determine the validity of the ONU names in descending order. The valid instruction position control unit 180 changes the validity of the "Force Report Grant" set in the ONU whose validity has been confirmed to be invalid in other sections. The valid instruction position control unit 180 changes the validity of the "Force Report Grant" set in the other ONU existing in the section where the validity is confirmed to be invalid. Then, the effective instruction position control unit 180 advances the process to step S34.

FIG. 14 is a diagram (No. 1) showing a specific example of the transmission setting determination process of the REPORT frame of the fourth embodiment. The table shown in FIG. 14A shows a state in which the time zone T is divided into four sections in step S31. The four sections are sections t1, t2, t3, t4. The sections t11 and t12 are obtained by dividing the section t1 into two sections. The sections t21 and t22 are obtained by dividing the section t2 into two sections. The sections t31 and t32 are obtained by dividing the section t3 into two sections. The sections t41 and t42 are obtained by dividing the section t4 into two sections.

The table shown in FIG. 14 (A) includes items with ONU names. ONU1 is the name of ONU200_1. ONU2 is the name of ONU200_2. ONU3 is the name of ONU200_3. ONU4 is the name of ONU200_4.
The table shown in FIG. 14A is expressed based on the information registered in the GATE frame for ONU200_1, ..., 200_4 at the time when step S31 is started.

In the table shown in FIG. 14 (A), "1" indicates when "Force Report Grant" is enabled. In the table shown in FIG. 14 (A), when "Force Report Grant" is disabled, it is indicated by "0". For example, the table shown in FIG. 14A shows that the Grant # 1 start time of the GATE frame transmitted to ONU200_1 (the name of ONU200_1 is ONU1) belongs to the interval t11. The table shown in FIG. 14A shows that the "Force Report Grant # 1" of the GATE frame transmitted to ONU200_1 (the name of ONU200_1 is ONU1) is set to be valid. Further, for example, the table shown in FIG. 14A shows that the Grant # 1 start time of the GATE frame transmitted to ONU200_2 (the name of ONU200_2 is ONU2) belongs to the section t21. The table shown in FIG. 14A shows that the “Force Report Grant # 1” of the GATE frame transmitted to ONU200_2 (the name of ONU200_2 is ONU2) is set to invalid.

The effective instruction position control unit 180 detects the number of ONUs for which "Force Report Grant" is set to be valid in each section divided into four (step S31). The valid instruction position control unit 180 detects that the number of ONUs for which valid is set for "Force Report Grant" in the section t1 is three (ONU1, 3, 4). The valid instruction position control unit 180 detects that the number of ONUs for which valid is set for "Force Report Grant" in the section t2 is two (ONU1, 3). The valid instruction position control unit 180 detects that the number of ONUs for which valid is set for "Force Report Grant" in the section t3 is one (ONU4). The valid instruction position control unit 180 detects that the number of ONUs for which valid is set for "Force Report Grant" in the section t4 is four (ONU1 to 4).

The valid instruction position control unit 180 specifies an interval t3 in which the number of ONUs for which valid is set in the “Force Report Grant” is equal to or less than the allowable number (the allowable number is 1) (Yes in step S32).

The valid instruction position control unit 180 specifies that valid is set for a plurality of "Force Report Grants" corresponding to ONU4 in the section t3. That is, the valid instruction position control unit 180 specifies that valid is set in the section t31 and the section t32. The effective instruction position control unit 180 effectively determines the “Force Report Grant” of the earliest section t31 in the time series. The valid instruction position control unit 180 invalidates the "Force Report Grant" in the section t32. The valid instruction position control unit 180 invalidates the validity of the “Force Report Grant” set in the ONU4 other than the section t3 (step S33).
The table shown in FIG. 14B shows a state in which the effective instruction position control unit 180 has executed steps S32 and S33.

FIG. 15 is a diagram (No. 2) showing a specific example of the transmission setting determination process of the REPORT frame of the fourth embodiment.
The valid instruction position control unit 180 identifies ONU2 in which the number of valid settings in the “Force Report Grant” is one in all sections (Yes in step S37).

The effective instruction position control unit 180 confirms the validity of the "Force Report Grant" set in ONU2. The valid instruction position control unit 180 invalidates the validity of the “Force Report Grant” set in ONUs 1 and 3 in the section t4 (step S38). The table shown in FIG. 15A shows a state in which the effective instruction position control unit 180 has executed steps S37 and S38.

The valid instruction position control unit 180 preferentially determines the validity of the ONU names in ascending order. That is, the valid instruction position control unit 180 determines the validity of the “Force Report Grant” set in ONU1 (step S39). The valid instruction position control unit 180 invalidates the validity of the "Force Report Grant" set in ONU1 in the section t2. The valid instruction position control unit 180 invalidates the validity of the "Force Report Grant" set in the ONU3 existing in the section t1. The table shown in FIG. 15B shows a state in which the effective instruction position control unit 180 has executed step S39.

The valid instruction position control unit 180 identifies ONU3 in which the number of valid settings in the “Force Report Grant” is one in all sections (Yes in step S37). The effective instruction position control unit 180 determines the validity of the “Force Report Grant” set in the ONU3 (step S38). Since the valid instruction position control unit 180 has confirmed the validity of "Force Report Grant" in all the sections, the process proceeds to step S35.

In this way, the OLT 100b controls the timing at which each ONU transmits a REPORT frame so that a large number of REPORT frames are not received from each ONU in a certain time zone. Thereby, the OLT 100b can level the opportunity to execute the state determination process using the state information included in the REPORT frame.

100, 100a, 100b OLT (optical communication device), 130 monitoring unit, 140 band allocation calculation unit, 150 band allocation control unit, 160, 160a transmission control unit, 170 status monitoring unit, 180 effective instruction position control unit, 200_1, ... , 200_n ONU (subscriber line terminal device, slave station device), 300 optical splitter, 310, 320_1, ..., 320_n optical fiber, 400 operation terminal, 500_1, ..., 500_n user terminal

Claims (9)

An optical communication device that is an optical line termination device on the master station side that communicates with a slave station device that is an optical line termination device on the slave station side using an optical fiber.
A monitoring unit that monitors the amount of data traffic received from the slave station device, and
A bandwidth allocation calculation unit that determines an uplink band to be allocated for uplink data transmission from the slave station device to the optical communication device based on the traffic volume.
When the band allocation amount corresponding to the upstream band is equal to or greater than the threshold value , it is previously determined that the slave station device is to transmit the state information indicating the state of the slave station device to the optical communication device. When the preset time has elapsed from, the data obtained by removing the state information using the uplink band without causing the slave station device to transmit the state information to the optical communication device and the said state information. A transmission control unit that transmits status information to the optical communication device,
Optical communication device with . An optical communication device that is an optical line termination device on the master station side that communicates with a slave station device that is an optical line termination device on the slave station side using an optical fiber.
A monitoring unit that monitors the amount of data traffic received from the slave station device, and
A bandwidth allocation calculation unit that determines an uplink band to be allocated for uplink data transmission from the slave station device to the optical communication device based on the traffic volume.
When the band allocation amount corresponding to the uplink is equal to or greater than the threshold value , and a preset time has elapsed since the last time the status information indicating the status of the slave station device was received from the slave station device . In this case, the slave station device is made to transmit the data excluding the state information and the state information to the optical communication device using the uplink band without transmitting the state information to the optical communication device. Transmission control unit and
Optical communication device with . An optical communication device that is an optical line termination device on the master station side that communicates with a slave station device that is an optical line termination device on the slave station side using an optical fiber.
A monitoring unit that monitors the amount of data traffic received from the slave station device, and
A bandwidth allocation calculation unit that determines an uplink band to be allocated for uplink data transmission from the slave station device to the optical communication device based on the traffic volume.
When the bandwidth allocation amount corresponding to the uplink band is equal to or larger than the threshold value, the uplink band is used without causing the slave station device to transmit the state information indicating the state of the slave station device to the optical communication device. A transmission control unit that causes the optical communication device to transmit data excluding the state information, and
Effective instruction position control unit and
Have,
The monitoring unit monitors the traffic volume of the data received from each of the plurality of slave station devices for each slave station device.
The band allocation calculation unit determines a plurality of uplink bands to be allocated to data transmission to the optical communication device for each slave station device based on the traffic volume of each slave station device, and sets a preset time zone. In, a plurality of times during which data transmission using each of the plurality of uplink bands is permitted are determined in association with a plurality of bandwidth allocation amounts corresponding to the plurality of uplink bands.
When the band allocation amount is less than the threshold value for each of the plurality of band allocation amounts for each of the slave station devices, the transmission control unit causes the optical communication device to transmit the state information at a time corresponding to the band allocation amount. Tentatively decided that
The valid instruction position control unit divides the time zone into a plurality of sections, and tentatively determines that the state information is transmitted to the optical communication device in each section of the plurality of sections. The child whose number is detected, a section in which the number of detected slave station devices is equal to or less than a preset number is specified, and the state information is tentatively determined to be transmitted to the optical communication device in the specified section. A station device is determined to transmit the state information to the optical communication device in a specified section, and is controlled so as not to transmit the state information to the optical communication device in a section other than the specified section.
Optical communication device. An optical communication device that is an optical line termination device on the master station side that communicates with a slave station device that is an optical line termination device on the slave station side using an optical fiber.
A monitoring unit that monitors the amount of data traffic received from the slave station device, and
A bandwidth allocation calculation unit that determines an uplink band to be allocated for uplink data transmission from the slave station device to the optical communication device based on the traffic volume.
When the bandwidth allocation amount corresponding to the uplink band is equal to or larger than the threshold value, the uplink band is used without causing the slave station device to transmit the state information indicating the state of the slave station device to the optical communication device. A transmission control unit that causes the optical communication device to transmit data excluding the state information, and
Effective instruction position control unit and
Have,
The monitoring unit monitors the traffic volume of the data received from each of the plurality of slave station devices for each slave station device.
The band allocation calculation unit determines a plurality of uplink bands to be allocated to data transmission to the optical communication device for each slave station device based on the traffic volume of each slave station device, and sets a preset time zone. In, a plurality of times during which data transmission using each of the plurality of uplink bands is permitted are determined in association with a plurality of bandwidth allocation amounts corresponding to the plurality of uplink bands.
When the band allocation amount is less than the threshold value for each of the plurality of band allocation amounts for each of the slave station devices, the transmission control unit causes the optical communication device to transmit the state information at a time corresponding to the band allocation amount. Tentatively decided that
The effective instruction position control unit tentatively determines that the time zone is divided into a plurality of sections, and the state information is transmitted to the optical communication device in the plurality of sections for each slave station device. Is detected, the slave station device whose detected number is the same as the preset number is specified, and it is determined that the state information is transmitted to the optical communication device for the specified slave station device.
Optical communication device. The effective instruction position control unit is a section to which the time when the specified slave station device transmits the state information to the optical communication device belongs, and the slave station device other than the specified slave station device has the state information. Is controlled so as not to be transmitted to the optical communication device,
The optical communication device according to claim 4 . An optical communication device that is an optical line termination device on the master station side that communicates with a slave station device that is an optical line termination device on the slave station side using an optical fiber.
A monitoring unit that monitors the amount of data traffic received from the slave station device, and
A bandwidth allocation calculation unit that determines an uplink band to be allocated for uplink data transmission from the slave station device to the optical communication device based on the traffic volume.
When the bandwidth allocation amount corresponding to the uplink band is equal to or larger than the threshold value, the uplink band is used without causing the slave station device to transmit the state information indicating the state of the slave station device to the optical communication device. A transmission control unit that causes the optical communication device to transmit data excluding the state information, and
Effective instruction position control unit and
Have,
The monitoring unit monitors the traffic volume of the data received from each of the plurality of slave station devices for each slave station device.
The band allocation calculation unit determines a plurality of uplink bands to be allocated to data transmission to the optical communication device for each slave station device based on the traffic volume of each slave station device, and sets a preset time zone. In, a plurality of times during which data transmission using each of the plurality of uplink bands is permitted are determined in association with a plurality of bandwidth allocation amounts corresponding to the plurality of uplink bands.
When the band allocation amount is less than the threshold value for each of the plurality of band allocation amounts for each of the slave station devices, the transmission control unit causes the optical communication device to transmit the state information at a time corresponding to the band allocation amount. Tentatively decided that
The effective instruction position control unit preferentially transmits the state information to the optical communication device in ascending or descending order of the numbers assigned to the slave station devices from among the plurality of slave station devices. Is specified, and it is determined that the state information is transmitted to the optical communication device for the specified slave station device.
Optical communication device. The optical communication device, which is the master station side optical line termination device, communicates with the slave station device, which is the slave station side optical line termination device, using an optical fiber.
Monitor the amount of data traffic received from the slave station device and
Based on the traffic volume, the uplink band to be allocated for data transmission from the slave station device to the optical communication device is determined.
When the band allocation amount corresponding to the upstream band is equal to or greater than the threshold value, and after the previous determination that the slave station device is to transmit the state information indicating the state of the slave station device to the optical communication device in advance. When the set time has elapsed, the data excluding the state information and the state information using the uplink band without causing the slave station device to transmit the state information to the optical communication device. To the optical communication device ,
Optical communication method. For an optical communication device that is an optical line termination device on the master station side that communicates with a slave station device that is an optical line termination device on the slave station side using an optical fiber.
Monitor the amount of data traffic received from the slave station device and
Based on the traffic volume, the uplink band to be allocated for data transmission from the slave station device to the optical communication device is determined.
When the band allocation amount corresponding to the upstream band is equal to or greater than the threshold value, and after the previous determination that the slave station device is to transmit the state information indicating the state of the slave station device to the optical communication device in advance. When the set time has elapsed, the data excluding the state information and the state information using the uplink band without causing the slave station device to transmit the state information to the optical communication device. To the optical communication device ,
An optical communication program that executes processing. The slave station device, which is the slave station side optical line termination device,
An optical communication device that is an optical line termination device on the master station side that communicates with the slave station device using an optical fiber.
Including
The optical communication device is
A monitoring unit that monitors the amount of data traffic received from the slave station device, and
A bandwidth allocation calculation unit that determines an uplink band to be allocated to data transmission from the slave station device to the optical communication device based on the traffic volume.
When the band allocation amount corresponding to the upstream band is equal to or greater than the threshold value, and after the previous determination that the slave station device is to transmit the state information indicating the state of the slave station device to the optical communication device in advance. When the set time has elapsed, the data excluding the state information and the state information using the uplink band without causing the slave station device to transmit the state information to the optical communication device. And a transmission control unit that causes the optical communication device to transmit
Have,
Optical communication system.

Images