JP6603181B2 - Optical communication system and optical communication method - Google Patents

Description

  The present invention relates to an optical communication system and an optical communication method.

  Due to increasing needs for high-speed access services, FTTH (Fiber To The Home) is spreading worldwide. Most of the FTTH services accommodate a plurality of subscriber side devices (ONU: Optical Network Unit) by one time division multiplexing (TDM: Time Division Multiplexing) in one accommodating station side device (OSU: Optical Subscriber Unit), It is provided by economically superior PON (Passive Optical Network) method.

  In uplink communication of TDM-PON, a system band is shared between ONUs. OLT (Optical Line Terminal) and dynamic bandwidth allocation (DBA) are performed, and the transmission permission time is notified to each ONU. Each ONU transmits signal light intermittently within this transmission permission time, thereby preventing collision of signal light toward the OSU.

  In addition to the request information, a DBA algorithm has been proposed that suppresses the upstream delay of the PON section by performing bandwidth allocation using prediction of input traffic from the terminal to the ONU (hereinafter referred to as “user traffic”). For example, Non-Patent Document 1 proposes a method of predicting user traffic newly arriving at an ONU after transmitting request information and assigning it in addition to the request amount. Non-Patent Document 2 proposes a method of indirectly measuring user traffic by allocating a fixed band to an ONU and measuring upstream traffic from the ONU to the OLT. In any case, the OLT needs to measure user traffic in order to accurately predict user traffic.

Yuanqiu Luo and Nirwan Ansari, “Limited sharing with traffic prediction for dynamic bandwidth allocation and QoS provisioning over Ethernet passive optical networks,” Journal of Optical Networking, vol. 4, No. 9, 2005. Takayuki Kobayashi, et al., “Bandwidth allocation scheme based on simple statistical traffic analysis for TDM-PON based mobile fronthaul,” OFC, 2016.

  However, the existing method has a problem that user traffic can be measured only up to the bandwidth allocated to the ONU.

  In view of the above circumstances, an object of the present invention is to provide a station-side terminal device and a traffic estimation method that measure user traffic exceeding an allocated bandwidth without modifying an ONU.

  One aspect of the present invention is an optical communication system including an optical line termination device and a station-side termination device, wherein the optical line termination device temporarily stores data transmitted to the station-side termination device. A storage unit, and reads out data stored in the data storage unit to generate request information indicating a request bandwidth according to an amount of data stored in the data storage unit, and sends the request to the station-side terminal device A first communication control unit that transmits information, and the station side termination device generates a permission information indicating a transmission permission time and an allocated bandwidth of the optical line termination device based on the request information; An optical communication system comprising a traffic estimation unit that estimates user traffic from the request information and the permission information.

  One aspect of the present invention is the optical communication system described above, wherein the traffic estimation unit notifies the estimated user traffic to a band allocation unit, and the band allocation unit is configured to transmit the optical line based on the user traffic. The permission information of the terminating device is generated.

  One aspect of the present invention is the optical communication system as described above, further including a traffic estimation device, wherein the traffic estimation device estimates user traffic from the request information and the permission information. A part.

  One aspect of the present invention is an optical communication method performed by an optical communication system including an optical line termination device and a station-side termination device, wherein the optical line termination device temporarily transmits data transmitted to the station-side termination device. Data storage step for storing data, and request information indicating the required bandwidth in accordance with the amount of data stored in the data storage unit by reading the data stored in the data storage unit by the optical line termination device A first communication control step of transmitting the request information to the station-side terminal device, and the station-side terminal device, based on the request information, transmitting permission time and allocated bandwidth of the optical line terminal device An optical communication method comprising: a bandwidth allocating step for generating permission information indicating: and a traffic estimation step in which the station-side terminating device estimates user traffic from the request information and the permission information. That.

  According to the present invention, it is possible to measure user traffic exceeding the allocated bandwidth without modifying the ONU.

It is a system configuration figure showing functional composition of the whole optical communication system 1 in a first embodiment. It is the figure which showed the flow of the process of the dynamic band allocation between the station side termination | terminus device 100 and the optical network unit 200-n. It is a sequence diagram showing operation | movement of the optical communication system 1 in 1st embodiment. It is an example showing the measurement result when the traffic monitor is executed by the conventional station-side terminal device 100. It is a system block diagram showing the function structure of the optical communication system 2 whole in 2nd embodiment. It is a sequence diagram showing operation | movement of the optical communication system 2 in 2nd embodiment.

(First embodiment)
FIG. 1 is a system configuration diagram showing the functional configuration of the entire optical communication system 1 in the first embodiment. The optical communication system 1 includes a station side termination device 100 and an optical line termination device 200-n. The station-side termination device 100 and the optical line termination device 200-n are connected to each other via an optical multiplexing / demultiplexing unit 400 so as to communicate with each other. Here, n is an arbitrary natural number satisfying 1 ≦ n ≦ N.

FIG. 2 is a diagram showing the flow of dynamic band allocation processing between the station-side terminating device 100 and the optical line terminating device 200-n. First, the station-side terminal device 100 transmits Grant information to the optical line terminal device 200-n. Next, the optical line terminator 200-n transmits the request information and the data stored in the optical line terminator 200-n to the station-side terminator 100 within the transmission permission time specified by this Grant information. . The station-side terminating device 100 generates Grant information for the optical line terminating device 200-n using the request information received from the optical line terminating device 200-n. The station-side termination device 100 transmits Grant information to the optical line termination device 200-n. The cycle for executing this series of processing is hereinafter referred to as “DBA cycle”.
The Request information is generated by using the amount of data stored in the data storage unit 203 by the optical network unit 200-n. The Request information is generated for each optical line termination device 200-n. The Request information is request information indicating a request band for the station-side terminal device 100. Each optical network unit 200-n transmits Request information within a transmission permission time indicated by Grant information (hereinafter referred to as “rn”). The Grant information is generated using the rn received by the station-side terminating device 100 from the optical line terminating device 200-n. The Grant information is permission information indicating a transmission permission time and an allocated bandwidth allocated to the optical line termination device 200-n. The Grant information is generated for each optical line termination device 200-n. The Grant information is transmitted to each optical line termination device 200-n. Each optical network unit 200-n acquires information on the transmission permission time and the allocated bandwidth allocated to itself based on the received Grant information (hereinafter referred to as “gn”).

  The station-side terminal device 100 is a device that realizes communication with another communication device by an optical signal passing through an optical communication network. The optical communication network to which the station side termination device 100 is connected is a passive optical communication network such as PON, for example. The station-side terminal device 100 is, for example, an OLT (optical subscriber line terminal device). The station-side terminal device 100 may be, for example, an OSU (Optical Subscriber Unit). The station-side terminal device 100 is installed, for example, in a station building connected to a mobile communication network. The station-side terminal device 100 includes a CPU (Central Processing Unit), a memory, an auxiliary storage device, and the like connected by a bus. The station-side terminal device 100 functions as a device including a communication unit 101, a function control unit 102, a bandwidth allocation unit 103, and a traffic estimation unit 104 by executing a traffic estimation program. Note that all or a part of each function of the station-side terminal device 100 may be realized using hardware such as an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA). Good. The traffic estimation program may be recorded on a computer-readable recording medium. The computer-readable recording medium is a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, a semiconductor storage device (for example, SSD: Solid State Drive), a hard disk built in a computer system, or a semiconductor storage. A storage device such as a device. The traffic estimation program may be transmitted via a telecommunication line.

  The communication unit 101 is a network interface. The communication unit 101 communicates with the optical line termination device 200-n via the optical multiplexing / demultiplexing unit 400. The communication unit 101 receives rn from the optical line termination device 200-n connected to the station side termination device 100. The communication unit 101 transmits gn to the optical line terminator 200-n connected to the station side terminator 100.

  The function control unit 102 notifies the band allocation unit 103 of the rn received from the optical network unit 200-n. The function control unit 102 causes the bandwidth allocation unit 103 to execute gn generation processing based on the requested bandwidth included in the rn. The function control unit 102 transmits this gn to the optical network unit 200-n via the communication unit 101 at a predetermined timing based on the DBA cycle. The predetermined timing is, for example, after the transmission permission time allocated to the optical line termination device 200-n has elapsed. The function control unit 102 notifies the traffic estimation unit 104 of the rn and gn. The function control unit 102 causes the traffic estimation unit 104 to execute traffic estimation processing.

  The bandwidth allocating unit 103 executes processing for generating gn that is information indicating the transmission permission time and the allocated bandwidth. The bandwidth allocation unit 103 generates gn using the rn received from the optical line termination device 200-n. The bandwidth allocation unit 103 notifies the function control unit 102 of the generated gn. The bandwidth allocation unit 103 may use any method as long as it generates one or more gns. Specifically, the bandwidth allocation unit 103 may allocate a bandwidth in a fixed manner regardless of rn, or may generate gn based on rn. The bandwidth allocation unit 103 may generate gn using the execution result of the traffic estimation process notified from the traffic estimation unit 104.

  The traffic estimation unit 104 holds rn and gn received from the function control unit 102 as a history. The traffic estimation unit 104 performs traffic estimation processing using the rn and gn. Specifically, the traffic estimation process is executed by executing a calculation process on two or more rn and gn transmitted and received within a predetermined period. Within the predetermined period is, for example, a DBA cycle. The traffic estimation unit 104 notifies the bandwidth allocation unit 103 of the execution result of the traffic estimation process.

  The optical line termination device 200-n is a device that realizes communication with another communication device by an optical signal passing through a communication network. The communication network to which the optical line terminator 200-n is connected is, for example, an optical fiber network such as PON. The optical line termination device 200-n is, for example, an ONU (Optical Network Unit). The optical line termination device 200-n may be configured using a plurality of devices. The optical line termination device 200-n is installed, for example, in the home of a user who receives communication service. The optical line termination device 200-n includes a CPU, a memory, an auxiliary storage device, and the like connected by a bus. The optical line termination device 200-n includes a first communication unit 201, a first communication control unit 202, a data storage unit 203, a second communication unit 204, and a second communication control unit 205 by executing a bandwidth request program. Functions as a device. Note that all or part of the functions of the optical line termination device 200-n may be realized using hardware such as an ASIC, a PLD, or an FPGA. The communication program may be recorded on a computer-readable recording medium. The computer-readable recording medium is a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, a semiconductor storage device (for example, SSD), a hard disk built in a computer system, a semiconductor storage device, etc. It is a storage device. The bandwidth request program may be transmitted via a telecommunication line.

  The first communication unit 201 is a network interface. The first communication unit 201 communicates with the station-side terminal device 100 via the optical multiplexing / demultiplexing unit 400.

  The first communication control unit 202 receives gn from the station-side terminal device 100. The first communication control unit 202 reads the data stored in the data storage unit 203 and generates rn. The first communication control unit 202 transmits the rn and the read data to the station-side terminal device 100 via the first communication unit 201 at a predetermined timing based on the DBA cycle. The predetermined timing is, for example, within a transmission permission time specified by the received gn. The first communication control unit 202 causes the data storage unit 203 to store the data addressed to the terminal 300 received from the station-side terminal device 100.

  The data storage unit 203 is configured using a storage device such as a magnetic hard disk device or a semiconductor storage device. The data storage unit 203 temporarily stores data addressed to the station-side terminal device 100 received from the terminal 300. The data storage unit 203 temporarily stores data addressed to the terminal 300 received from the station side terminal device 100. More specifically, the term “temporarily” refers to the time until data is read from the data storage unit 203. That is, when the stored data is read out to either the first communication control unit 202 or the second communication control unit 205, the data storage unit 203 deletes the data from the data storage unit 203.

  The second communication unit 204 is a network interface. The second communication unit 204 communicates with the terminal 300 via a communication line.

  The second communication control unit 205 stores the data received from the terminal 300 in the data storage unit 203. The second communication control unit 205 reads data addressed to the terminal 300 stored in the data storage unit 203. The second communication control unit 205 transmits the read data to the terminal 300 via the second communication unit 204.

  The terminal 300 is configured using an information processing apparatus such as a network device, a mainframe, a workstation, or a personal computer. The terminal 300 may be a home appliance or a sensor. The terminal 300 includes a CPU, a memory, an auxiliary storage device, and the like connected by a bus. All or some of the functions of the terminal 300 may be realized using hardware such as an ASIC, PLD, or FPGA. Programs relating to all or part of each function of the terminal 300 may be recorded on a computer-readable recording medium. The computer-readable recording medium is a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, a semiconductor storage device (for example, SSD), a hard disk built in a computer system, a semiconductor storage device, etc. It is a storage device.

  The optical multiplexing / demultiplexing means 400 aggregates the signals (such as rn) transmitted from the optical line terminating device 200-n and transmits them to the station-side terminating device 100. Further, the optical multiplexing / demultiplexing means 400 distributes a signal (eg, gn) transmitted from the station side termination apparatus 100 and transmits it to the optical line termination apparatus 200-n.

  FIG. 3 is a sequence diagram showing the operation of the optical communication system 1 in the first embodiment. Hereinafter, the user traffic estimation method of the first embodiment will be described in detail with reference to FIG.

  First, symbols used in FIG. 3 are defined. The symbol n is a symbol corresponding to “n” of the optical network unit 200-n. Symbol k and symbol j (k <j) are serial numbers of the DBA cycle. rn (k) is assumed to be rn of the optical network unit 200-n in the k-th DBA cycle. gn (k) is the gn of the optical network unit 200-n in the kth DBA cycle. dn (k) is a data transmission amount transmitted from the optical line termination device 200-n to the station-side termination device 100 within the transmission time allocated based on gn (k). bn (t) is the amount of data stored in the data storage unit 203 of the optical network unit 200-n at time t. xn (t) is user traffic of the optical network unit 200-n at time t. t (*) is the time when * is transmitted. For example, t (rn (k)) is a time for transmitting rn (k).

  Next, a method for estimating the amount of user traffic will be described. When the user traffic xn flows into the optical network unit 200-n, the data amount bn stored in the data storage unit 203 increases. On the other hand, when the data transmission amount dn flows out of the optical line terminating device 200-n, the data amount bn decreases. That is, Formula (1) is materialized about time t1 and time t2 (t1 <= t2).

  When the optical network unit 200-n transmits rn (k) at time t1 and rn (j) at time t2, rn (k) = bn (t1) and rn (j) = bn (t2) are (The time when rn (k) is transmitted is hereinafter referred to as “t1”) (The time when rn (j) is transmitted is hereinafter referred to as “t2”). Further, since the sum of the data transmission amounts dn in the period [t1, t2] is equal to the sum of gn corresponding to the data transmission in the period [t1, t2], Expression (2) is established. However, Kn (t1, t2) is a set of k in which the transmission time of the uplink data dn (k) is included in the period [t1, t2].

  Substituting equation (2) into equation (1) and calculating, equation (3) is established.

  The traffic estimation unit 104 estimates the accumulated user traffic in the period [t1, t2] of the optical line termination device 200-n from rn and gn by calculating Expression (3).

  Hereinafter, a detailed description will be given based on each step of the sequence diagram shown in FIG. When the DBA cycle is k, the function control unit 102 transmits gn (k), which is information indicating the transmission permission time, to the optical line termination device 200-n. The function control unit 102 notifies gn (k) to the traffic estimation unit 104 (step S101). The first communication control unit 202 reads data from the data storage unit 203 and generates rn (k) based on the read data amount (step S102). The first communication control unit 202 transmits the generated rn (k) to the station-side terminating device 100 within the transmission permission time specified by gn (k). The function control unit 102 passes the received rn (k) to the traffic estimation unit 104 (step S103). The first communication control unit 202 transmits the read data to the station end device 100 within the transmission permission time specified by gn (k) (step S104). In step S103 and step S104, step S103 may be executed after step S104 is executed.

  When function controller 102 receives rn (k), function controller 102 notifies band allocator 103 of rn (k). The bandwidth allocation unit 103 executes a process of generating gn (k + 1) based on the bandwidth information requested by rn (k). The bandwidth allocation unit 103 may use any method as long as it generates one or more gns. Specifically, the bandwidth may be fixedly allocated regardless of the bandwidth information required by rn (k). The band allocation unit 103 may generate gn (k + 1) based on the band information. The bandwidth allocation unit 103 notifies the function control unit 102 of the generated gn (k + 1) (step S105).

  The optical communication system 1 repeats Steps S101 to S105 until the DBA cycle becomes j.

  When the DBA cycle becomes j, the function control unit 102 transmits gn (j) to the optical line termination device 200-n. The function control unit 102 notifies gn (j) to the traffic estimation unit 104 (step S106). The first communication control unit 202 reads data from the data storage unit 203 and generates rn (j) from the read data amount (step S107). The first communication control unit 202 transmits the generated rn (j) to the station-side terminating device 100 within the transmission permission time specified by gn (j). The function control unit 102 passes the received rn (j) to the traffic estimation unit 104 (step S108). The first communication control unit 202 transmits the read data to the station-side terminal device 100 within the transmission permission time specified by gn (j) (step S109). In step S108 and step S109, step S108 may be executed after step S109 is executed.

  The traffic estimation unit 104 executes a traffic estimation process using the rn and gn history received. Specifically, by calculating Equation (3) using rn (k), rn (j), and gn (t) (k ≦ t ≦ j), t1 to t2 of the optical line termination device 200-n. The user traffic up to is estimated (step S110).

(effect)
FIG. 4 is an example showing a measurement result when a traffic monitor is executed by the conventional station-side terminal device 100. Conventionally, a fixed bandwidth (a in the figure) is allocated to the optical line termination device 200-n, and the upstream traffic from the optical line termination device 200-n to the station-side termination device 100 is measured, so that the user indirectly. In this case, when the fixed band is not sufficiently large for the user traffic, the traffic received by the station-side terminal device 100 is different from the user traffic. On the other hand, in the optical transmission system of the first embodiment, rn (k) and rn (j) received by the station-side terminating device 100 and gn (t) transmitted by the station-side terminating device 100 (k ≦ t ≦ j ) To estimate user traffic. With this configuration, user traffic can be measured over the allocated bandwidth without modifying the optical line termination device 200-n.

(Second embodiment)
FIG. 5 is a system configuration diagram showing the functional configuration of the entire optical communication system 2 in the second embodiment. The optical communication system 2 is different from the optical communication system 1 in the first embodiment in that the optical communication system 2 includes a station side termination device 100a instead of the station side termination device 100 and further includes a traffic estimation device 500. The configuration is the same as that of the optical communication system 1.

  The station-side terminal device 100a differs from the station-side terminal device 100 in the first embodiment in that it includes a function control unit 102 instead of the function control unit 102 and a second communication unit 105. In this respect, the configuration is the same as that of the station-side terminal device 100.

  The function control unit 102a notifies the bandwidth allocation unit 103 of the rn received from the optical network unit 200-n. The function control unit 102a causes the bandwidth allocation unit 103 to execute gn generation processing based on the requested bandwidth included in the rn. The function control unit 102 transmits this gn to the optical network unit 200-n via the communication unit 101 at a predetermined timing based on the DBA cycle. The predetermined timing is, for example, after the transmission permission time allocated to the optical line termination device 200-n has elapsed. The function control unit 102a transmits the rn and gn to the traffic estimation apparatus 500 via the second communication unit 105. The function control unit 102a transmits this gn to the optical network unit 200-n via the communication unit 101.

  The second communication unit 105 is a network interface. The second communication unit 105 communicates with the traffic estimation device 500 via a communication line.

  The traffic estimation apparatus 500 is configured using an information processing apparatus such as a network device, a mainframe, a workstation, or a personal computer. The traffic estimation device 500 includes a CPU, a memory, an auxiliary storage device, and the like connected by a bus. The traffic estimation device 500 functions as a device including a communication unit 501, a function control unit 502, and a traffic estimation unit 503 by executing a traffic estimation program. Note that all or some of the functions of the traffic estimation apparatus 500 may be realized using hardware such as an ASIC, a PLD, or an FPGA. A program related to all or part of each function of the traffic estimation apparatus 500 may be recorded on a computer-readable recording medium. The computer-readable recording medium is a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, a semiconductor storage device (for example, SSD), a hard disk built in a computer system, a semiconductor storage device, etc. It is a storage device.

  The communication unit 501 is a network interface. The communication unit 501 communicates with the station-side terminal device 100a via a communication line.

  The function control unit 502 notifies the traffic estimation unit 503 of the rn and gn received from the station-side terminal device 100a. The function control unit 502 causes the traffic estimation unit 503 to execute traffic estimation processing.

  The traffic estimation unit 503 holds rn and gn received from the function control unit 502 as a history. The traffic estimation unit 503 executes traffic estimation processing using the rn and gn. The traffic estimation unit 503 executes a traffic estimation process from rn and gn received from the function control unit 502. Specifically, the traffic estimation process is executed by executing a calculation process on two or more rn and gn transmitted and received within a predetermined period. Within the predetermined period is, for example, a DBA cycle. The traffic estimation unit 503 notifies the bandwidth allocation unit 103 of the execution result of the traffic estimation process.

  FIG. 6 is a sequence diagram showing the operation of the optical communication system 2 in the second embodiment. Hereinafter, the user traffic estimation method according to the second embodiment will be described in detail with reference to FIG.

  First, the symbols used in FIG. 6 are the same as the symbols used in FIG. Next, it will be described in detail based on each step of the sequence diagram shown in FIG. In FIG. 6, the time when the optical line terminator 200-n transmits rn (k) (hereinafter referred to as “t1”) to the time when the optical line terminator 200-n generates rn (j) (hereinafter referred to as “t2”). Estimated cumulative user traffic until. When the DBA cycle is k, the function control unit 102a transmits gn (k), which is information indicating the transmission permission time, to the optical line termination device 200-n (step S201). The function control unit 102a transmits this gn (k) to the traffic estimation device 500 (step S202). The first communication control unit 202 reads data from the data storage unit 203, and generates rn (k) based on the read data amount (step S203). The first communication control unit 202 transmits the generated rn (k) to the station-side terminal device 100a within the transmission permission time specified by gn (k) (step S204). The first communication control unit 202 transmits the read data to the station-side terminal device 100a within the transmission permission time specified by gn (k) (step S205). In step S204 and step S205, step S204 may be executed after step S205 is executed. The function control unit 102a transmits the received rn (k) to the traffic estimation device 500 (step S206).

  When function controller 102a receives rn (k), function controller 102a notifies band allocator 103 of rn (k). The bandwidth allocation unit 103 executes a process of generating gn (k + 1) based on the bandwidth information requested by rn (k). The bandwidth allocation unit 103 may use any method as long as it generates one or more gns. Specifically, the bandwidth may be fixedly allocated regardless of the bandwidth information required by rn (k). The band allocation unit 103 may generate gn (k + 1) based on the band information. The bandwidth allocation unit 103 notifies the function control unit 102a of the generated gn (k + 1) (step S207).

  The optical communication system 2 repeats step S201 to step S207 until the DBA cycle becomes j.

  When the DBA cycle reaches j, the function control unit 102a transmits gn (j) to the optical line termination device 200-n (step S208). The function control unit 102a transmits gn (j) to the traffic estimation device 500 (step S209). The first communication control unit 202 reads data from the data storage unit 203 and generates rn (j) from the read data amount (step S210). The first communication control unit 202 transmits the generated rn (j) to the station-side terminal device 100a within the transmission permission time specified by gn (j) (step S211). The first communication control unit 202 transmits the read data to the station-side terminal device 100a within the transmission permission time specified by gn (j) (step S212). In step S211 and step S212, step S211 may be executed after step S212 is executed. The function control unit 102a transmits the received rn (j) to the traffic estimation device 500 (step S213).

  The function control unit 502 notifies the traffic estimation unit 503 of the received rn (k), rn (j), and gn (t) (k ≦ t ≦ j). The traffic estimation unit 503 executes the traffic estimation process using the notified rn (k), rn (j), and gn (t) (k ≦ t ≦ j). Specifically, the user traffic from t1 to t2 of the optical line termination device 200-n is estimated by calculating Expression (3) (step S214).

  As mentioned above, although embodiment of this invention has been explained in full detail with reference to drawings and numerical formulas, the specific configuration is not limited to this embodiment, and design and the like within the scope not departing from the gist of this invention are included. .

DESCRIPTION OF SYMBOLS 1 ... Optical communication system, 2 ... Optical communication system, 100 ... Station side termination device, 101 ... Communication part, 102 ... Function control part, 103 ... Band allocation part, 104 ... Traffic estimation part, 200-n ... Optical line termination apparatus , 201 ... 1st communication part, 202 ... 1st communication control part, 203 ... Data storage part, 204 ... 2nd communication part, 205 ... 2nd communication control part, 300 ... Terminal, 400 ... Optical multiplexing / demultiplexing means, 100a ... Station side terminal device, 102a ... function control unit, 105 ... second communication unit, 500 ... traffic estimation device, 501 ... communication unit, 502 ... function control unit, 503 ... traffic estimation unit

Claims (4)

An optical communication system comprising an optical line termination device and a station side termination device,
The optical line terminator is:
A data storage unit for temporarily storing data transmitted to the station-side terminal device;
Reads data stored in the data storage unit, generates request information indicating a required bandwidth according to the amount of data stored in the data storage unit, and transmits the request information to the station-side terminal device A first communication control unit,
The station side termination device is:
A bandwidth allocation unit that generates permission information indicating a transmission permission time and an allocated bandwidth of the optical line termination device based on the request information, and transmits the permission information to the optical line termination device ;
Based on the request information received at the first time and the second time and the permission information transmitted during the period from the first time to the second time , input from the terminal to the optical line termination device during the period and a traffic estimation unit that estimates a user traffic that is,
Optical communication system. A communication system comprising an optical line terminal and Tsubonegawa terminator and traffic estimator,
The optical line terminator is:
A data storage unit for temporarily storing data transmitted to the station-side terminal device;
Reads data stored in the data storage unit, generates request information indicating a required bandwidth according to the amount of data stored in the data storage unit, and transmits the request information to the station-side terminal device A first communication control unit,
The station side termination device is:
Based on the request information, generating permission information indicating a transmission permission time and an allocated bandwidth of the optical line terminator, and including a bandwidth allocating unit that transmits the permission information to the optical line terminator,
The traffic estimation device includes:
Based on the request information received by the station-side terminal device at the first time and the second time, and the permission information transmitted by the station-side terminal device during the period from the first time to the second time , A traffic estimation unit that estimates user traffic input from the terminal to the optical line termination device during the period ;
Optical communication system. The traffic estimator notifies the user traffic estimated in the band allocation unit, the bandwidth allocation unit generates the permission information of the optical network unit based on the user traffic, according to claim 1 or 2 An optical communication system according to claim 1. An optical communication method performed by an optical communication system including an optical line termination device and a station side termination device,
A data storage step in which the optical line terminator temporarily stores data transmitted to the station-side terminator in a data storage unit ;
The optical line termination apparatus generates request information indicating the requested bandwidth according to the amount of data stored in the data storage unit reads the data stored in the data storage unit, the station-side termination apparatus A first communication control step of transmitting the request information to
The station-side termination apparatus, the bandwidth allocation step of generating the permission information indicating transmission permitted time and the allocated bandwidth before Symbol optical network unit based on the request information, it sends the permission information to the optical line terminal When,
Based on the request information received by the station-side terminal device at the first time and the second time and the permission information transmitted during the period from the first time to the second time, from the terminal during the period A traffic estimation step for estimating user traffic input to the optical line termination device ;
An optical communication method comprising:

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