JP2005151429A - Optical subscriber line terminal apparatus, dynamic band assignment method, and its computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical subscriber line terminal apparatus which is capable of giving permission for transmission correctly to an optical subscriber line terminating device, and to provide a dynamic band assignment method and its computer program. <P>SOLUTION: A receiving unit 11 receives a request band volume sent from the optical subscriber line terminating device. A control frame processing unit 13 determines a following band assignment volume that is assigned to the optical subscriber line terminating device on the basis of the request band volume of the optical subscriber line terminating device received by the receiving unit 11 and the cumulative band volume of band assignment volumes assigned to the optical subscriber line terminating device in the past. When a request band volume requested by the optical subscriber line terminating device is smaller than a target band volume that can be assigned at a prescribed period and the whole request band volume is assigned to the optical subscriber line terminating device, a prescribed band volume is previously set in the cumulative band assignment volume. Therefore, the sum of excessive alignment bands can be prevented from decreasing, a permission for transmission can be correctly given to the optical subscriber line terminating device, and the cumulative band assignment volume can be prevented from overflowing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a PON (Passive Optical Network) that is a medium-shared communication in which a plurality of home-side devices share a medium and transmit data, and in particular, EPON (Transmission of data as an Ethernet (R) frame) The present invention relates to an OLT (Optical Subscriber Line Terminal Station) that efficiently allocates an upstream band in Ethernet (R) PON), a dynamic band allocation method used therefor, and a computer program thereof.

  In recent years, the Internet has become widespread, and users can access various information on sites operated in various parts of the world and obtain the information. Along with this, the demand for broadband access such as ADSL (Asymmetric Digital Subscriber Line) and FTTH (Fiber To The Home) is also increasing rapidly. As a technology related to this, there is an invention disclosed in Japanese Patent Laid-Open No. 2003-87283.

  The dynamic bandwidth allocation method disclosed in Japanese Patent Laid-Open No. 2003-87283 accepts a bandwidth request amount from each of a plurality of subscriber termination devices, and accumulates the bandwidth request amount of the request source and the bandwidth allocation amount allocated in the past. Based on the value, the next bandwidth allocation amount is calculated for each request source, and transmission permission based on the result is transmitted to each of the plurality of subscriber termination devices.

FIG. 4 is a flowchart for explaining the dynamic bandwidth allocation method disclosed in Japanese Patent Laid-Open No. 2003-87283. Assuming that the subscriber terminal number is j, the period is k, the guaranteed bandwidth is bw_min _j , and the ideal full bandwidth allocation is bw_ref, the target allocated bandwidth bw_target is defined by the following equation. Note that R _{j, k} indicates a bandwidth requested by the subscriber terminal device of number j in the period k.

First, when the period k is 0, the target allocated bandwidth bw_target _{j, k} calculated by the equation (1) is substituted into the ideal cumulative allocated amount bw_ideal _{j, k} of each subscriber terminal device. Further, when the period k is larger than 0 and the excess allocation bandwidth is bw_add, the ideal cumulative allocation amount bw_ideal _{j, k} of each subscriber termination device is (bw_target _{j, k} −bw_add _{j, k−1} ). Is substituted (S21).

Next, it is determined whether or not the ideal cumulative allocation amount bw_ideal _{j, k} is larger than 0 (S22). When bw_ideal _{j, k} is larger than 0 (S22, Yes), the requested bandwidth Q _{j, k} from the subscriber termination device is substituted into the allocated bandwidth bw_temp _{j, k} of the subscriber termination device (S23). . That is, assuming that there is a band to be allocated to the subscriber termination device, a bandwidth is allocated to the subscriber termination device by the required bandwidth Q _{j, k} .

If bw_ideal _{j, k} is 0 or less (S22, No), 0 is assigned to the allocated bandwidth bw_temp _{j, k} of the subscriber termination device (S24). That is, assuming that there is no bandwidth allocated to the subscriber termination device, no bandwidth is allocated to the subscriber termination device.

Next, (bw_temp _{j, k-} bw_ideal _{j, k} ) is substituted into the excessive allocation band bw_add _{j, k} (S25). If this excessive allocation bandwidth bw_add _{j, k} is larger than 0, the next ideal cumulative allocation amount bw_ideal _{j, k} is reduced because the bandwidth is excessively allocated. Also, if this excessive allocation bandwidth bw_add _{j, k} is smaller than 0, the next ideal cumulative allocation amount bw_ideal _{j, k} is increased because the bandwidth allocation amount is small.

Finally, it is determined whether or not the process has been repeated for the number of request sources (S26). If the process is repeated for the number of request sources (S26, Yes), the process ends. If the process is not repeated for the number of request sources (S26, No), the process returns to step S21 and the subsequent processes are repeated.
JP 2003-87283 A

In the above-described dynamic bandwidth allocation method, when there is a subscriber termination device that requires only a bandwidth that is too small relative to the contract bandwidth (guaranteed bandwidth) _, it is always more than the target allocation bandwidth bw_target _{j, k} for that subscriber termination device. The required bandwidth Q _{j, k} is reduced. Therefore, the excessive allocation bandwidth bw_add _{j, k} always decreases (the ideal cumulative allocation amount bw_ideal _{j, k} always increases), and when this algorithm is executed on the computer, the excessive allocation bandwidth (ideal cumulative allocation amount) ) Overflowed.

  In addition, when the period is set to a fixed length, there is a subscriber termination device that requires only a bandwidth that is too small with respect to the contract bandwidth (guaranteed bandwidth). When the subscriber terminal device requests a sufficient amount of bandwidth, a function for determining whether transmission is permitted or not including other subscriber terminal devices depending on whether the ideal band is positive or negative (S22 in FIG. 4). ) Did not work properly.

  This is because when the bandwidth utilization rate is not 100%, the sum of the over-allocated bandwidths decreases (the sum of the ideal bandwidths exceeds the ideal all-allocated bandwidth), and when the bandwidth utilization rate is 100%, the over-allocated bandwidth This is because the sum of the numbers does not increase or decrease. In other words, the band already lost is counted as an insufficient allocation.

  The present invention has been made to solve the above problems, and a first object of the present invention is to provide an optical subscriber line terminal station apparatus, a dynamic band allocation, and a variable representing an excessively allocated band from preventing an overflow. It is to provide a method and its computer program.

  A second object of the present invention is to provide an optical subscriber line terminal station apparatus, a dynamic band allocation method, and a computer program thereof that can correctly perform transmission permission to the optical subscriber line termination apparatus.

  An optical subscriber line terminal apparatus according to claim 1 is an optical subscriber line terminal apparatus that transmits a bandwidth allocation amount to a requested band from a plurality of optical subscriber line termination devices, A receiving means for receiving a requested bandwidth amount from the line terminating device, a requested bandwidth amount of the optical subscriber line terminating device received by the receiving means, and a bandwidth allocation amount allocated to the optical subscriber line terminating device in the past Based on the accumulated value, the next bandwidth allocation amount to be allocated to the optical subscriber line terminating device is determined, and when the bandwidth allocation amount exceeds the threshold value, the bandwidth allocation amount is predetermined. Control means for setting the predetermined value and transmission means for transmitting the bandwidth allocation determined by the control means to the optical subscriber line terminating device.

  An optical subscriber line terminal apparatus according to claim 2 is an optical subscriber line terminal apparatus that transmits a bandwidth allocation amount for a requested band from a plurality of optical subscriber line termination devices, A receiving means for receiving a requested bandwidth amount from the line terminating device, a requested bandwidth amount of the optical subscriber line terminating device received by the receiving means, and a bandwidth allocation amount previously allocated to the optical subscriber line terminating device; Based on the accumulated value, the next bandwidth allocation amount to be allocated to the optical subscriber line termination device is determined, and the requested bandwidth amount from the optical subscriber line termination device is smaller than the target value of the bandwidth that can be allocated in a predetermined cycle. And a control means for setting a predetermined value as a cumulative value of the bandwidth allocation amount when the total required amount is allocated to the optical subscriber line terminating device, and a bandwidth allocation amount determined by the control means To transmit to the optical subscriber line terminating equipment And a transmission means.

  An optical subscriber line terminal apparatus according to claim 3 is the optical subscriber line terminal apparatus according to claim 2, wherein the target value of the band is equal to a contract band or a guaranteed band of the optical subscriber line termination apparatus. It is a band determined based on this.

  5. The dynamic bandwidth allocation method according to claim 4, wherein the bandwidth allocation amount is determined for a requested bandwidth from a plurality of optical subscriber line terminators, and the received optical subscriber line termination is performed. Determining a next bandwidth allocation amount to be assigned to the optical subscriber line termination device based on a required bandwidth amount of the device and a cumulative value of the bandwidth allocation amount previously assigned to the optical subscriber line termination device; And a step of setting a predetermined value as a cumulative value of the bandwidth allocation amount when the cumulative value of the amount exceeds a threshold value.

  The dynamic band allocation method according to claim 5 is a dynamic band allocation method for determining a band allocation amount with respect to a requested band from a plurality of optical subscriber line termination apparatuses, wherein the received optical subscriber line termination is performed. Determining a next bandwidth allocation amount to be allocated to the optical subscriber line termination device based on a required bandwidth amount of the device and a cumulative value of the bandwidth allocation amount previously allocated to the optical subscriber line termination device; If the requested bandwidth amount from the subscriber line terminating device is smaller than the target value of the bandwidth that can be allocated in a predetermined cycle and all the requested amounts are allocated to the optical subscriber line terminating device, the accumulated bandwidth allocation amount Setting a predetermined value.

  A computer program according to claim 6 is a computer program for causing a computer to execute a dynamic bandwidth allocation method for determining a bandwidth allocation amount with respect to a requested bandwidth from a plurality of optical subscriber line terminating devices. The dynamic bandwidth allocation method is based on the received requested bandwidth amount of the optical subscriber line termination device and the cumulative value of the bandwidth allocation amount previously allocated to the optical subscriber line termination device. Determining a next bandwidth allocation amount to be allocated to the mobile phone, and setting a predetermined value as a cumulative value of the bandwidth allocation amount when the cumulative value of the bandwidth allocation amount exceeds a threshold value.

  The computer program according to claim 7 is a computer program for causing a computer to execute a dynamic bandwidth allocation method for determining a bandwidth allocation amount with respect to a requested bandwidth from a plurality of optical subscriber line terminating devices. The dynamic bandwidth allocation method is based on the received requested bandwidth amount of the optical subscriber line termination device and the cumulative value of the bandwidth allocation amount previously allocated to the optical subscriber line termination device. Determining the next bandwidth allocation amount to be allocated to the optical subscriber line termination device, and the requested bandwidth amount from the optical subscriber line termination device is smaller than the target value of the bandwidth that can be allocated in a predetermined cycle and A step of setting a predetermined value as a cumulative value of the bandwidth allocation amount when the requested amount is allocated.

  According to the optical subscriber line terminal apparatus of claim 1, when the cumulative value of the bandwidth allocation amount exceeds the threshold value, the control means sets a predetermined value to the cumulative value of the bandwidth allocation amount. Since the setting is made, it is possible to prevent the cumulative value of the bandwidth allocation amount from overflowing.

  According to the optical subscriber line terminal apparatus of claim 2, the required bandwidth amount from the optical subscriber line termination device is smaller than the target value of the band that can be allocated at a predetermined period, and the optical subscriber line When all the requested amounts are allocated to the terminating device, the control means sets a predetermined value as a cumulative value of the bandwidth allocation amount, so that it is possible to prevent the sum of the excessive allocation bandwidth from being reduced, and the optical subscriber It has become possible to correctly permit transmission to the line termination equipment. Further, it is possible to prevent the accumulated value of the bandwidth allocation amount from overflowing.

  According to the optical subscriber line terminal device according to claim 3, since the target value of the band is a band determined based on the contract band or the guaranteed band of the optical subscriber line termination apparatus, each optical subscriber line It became possible to guarantee the bandwidth according to the contracted bandwidth or guaranteed bandwidth for the terminal equipment.

  According to the dynamic bandwidth allocation method of claim 4, when the cumulative value of bandwidth allocation exceeds a threshold value, a predetermined value is set in advance as the cumulative value of bandwidth allocation. It is possible to prevent the cumulative value of the allocated amount from overflowing.

  According to the dynamic bandwidth allocating method of claim 5, the requested bandwidth amount from the optical subscriber line terminator is smaller than the target value of the band that can be allocated in a predetermined cycle, and the optical subscriber line terminator When all the requested amounts are allocated, a predetermined value is set as a cumulative value of the bandwidth allocation amount, so that it is possible to prevent the sum of the excessive allocation bandwidths from being reduced and to permit transmission to the optical subscriber line terminating device. It became possible to do correctly. Further, it is possible to prevent the accumulated value of the bandwidth allocation amount from overflowing.

  According to the computer program according to claim 6, when the cumulative value of the bandwidth allocation amount exceeds a threshold value, a predetermined value is set in advance as the cumulative value of the bandwidth allocation amount. It has become possible to prevent the accumulated value of.

  According to the computer program of the seventh aspect, the requested bandwidth amount from the optical subscriber line terminating device is smaller than the target value of the band that can be allocated at a predetermined cycle, and all the optical subscriber line terminating devices are allocated to the optical subscriber line terminating device. When the requested amount is allocated, a predetermined value is set as a cumulative value of the bandwidth allocation amount, so that it is possible to prevent the sum of the excessive allocation bandwidth from being reduced, and transmission permission to the optical subscriber line terminating device is correctly set. It became possible to do. Further, it is possible to prevent the accumulated value of the bandwidth allocation amount from overflowing.

(First embodiment)
FIG. 1 is a block diagram showing a schematic configuration of an OLT (optical subscriber line terminal equipment) according to the first embodiment of the present invention. The OLT 1 receives an optical signal from an ONU (Optical Subscriber Line Termination Unit) and outputs a frame, a transmission unit 12 that sends a data frame received from the reception unit 11 to an upper network, and a reception A control frame processing unit 13 that generates a grant frame based on a report frame received from the unit 11 and performs transmission control of a data frame received from the higher level network; and a reception unit 14 that receives a frame from the higher level network; A buffer memory 15 for accumulating frames received by the receiving unit 14, and a transmitting unit 16 for sending frames accumulated in the buffer memory 15 to the ONU under the control of the control frame processing unit 13. The buffer memory 15 may be any memory that can store data, such as a register, a flip-flop circuit, or a latch circuit.

  The receiving unit 11 receives the optical signal from the ONU and reads the header portion of the frame to determine whether it is a data frame or a control frame such as a report frame. If the received frame is a data frame, the reception unit 11 transfers the data frame to the transmission unit 12. If the received frame is a control frame, the receiving unit 11 transfers the control frame to the control frame processing unit 13.

  When receiving the data frame from the reception unit 11, the transmission unit 12 transmits the data frame to the upper network.

  The control frame processing unit 13 has a function of determining a bandwidth allocation amount for each ONU by a processing procedure described later. When receiving the report frame from the receiving unit 11, the control frame processing unit 13 creates a grant frame including the determined bandwidth allocation amount and transfers it to the buffer memory 15. The control frame processing unit 13 also performs transmission control of frames stored in the buffer memory 15.

  The receiving unit 14 receives a frame from the upper network and transfers it to the buffer memory 15. The buffer memory 15 accumulates the control frames and data frames transferred from the control frame processing unit 13 and the receiving unit 14 in the queue, and transfers the frames accumulated in the queue to the transmission unit 16 under the control of the control frame processing unit 13. . The transmission unit 16 transmits the control frame and data frame transferred from the buffer memory 15 to the ONU.

  FIG. 2 is a flowchart for explaining the processing procedure of the control frame processing unit 13 according to the first embodiment of the present invention. The processing shown in FIG. 2 is realized by executing a dynamic bandwidth allocation program stored in a memory by a CPU (Central Processing Unit) in the OLT.

First, when the period k is 0, the target allocated bandwidth bw_target _{j, k} calculated by the equation (1) is substituted into the ideal cumulative allocated amount bw_ideal _{j, k} of each ONU. Further, when the period k is larger than 0 and the excess allocated bandwidth is bw_excess, (bw_target _{j, k} −bw_excess _{j, k−1} ) is substituted for the ideal cumulative allocation amount bw_ideal _{j, k} of each ONU. (S1).

Next, it is determined whether or not the ideal cumulative allocation amount bw_ideal _{j, k} is larger than 0 (S2). bw_ideal _j, when _k is greater than 0 (S2, Yes), ONU allocation band grant_length _j, required bandwidth _{Q j} from the ONU to _{k, k} is substituted (S3). When bw_ideal _{j, k} is 0 or less (S2, No), 0 is assigned to the ONU allocated bandwidth grant_length _{j, k} (S4).

Next, (grant_length _{j, k-} bw_ideal _{j, k} ) is substituted into the excessive allocation bandwidth bw_excess _{j, k} (S5). If this excessive allocation bandwidth bw_exce _{j, k} is larger than 0, the next ideal cumulative allocation amount bw_ideal _{j, k} is reduced because the bandwidth is excessively allocated. Further, if the excessive allocation bandwidth bw_excess _{j, k} is smaller than 0, the next ideal cumulative allocation amount bw_ideal _{j, k} is increased because the bandwidth allocation amount is small.

  Next, it is determined whether or not the processing has been repeated for the number of request sources (S6). If the process is repeated for the number of request sources (S6, Yes), the process proceeds to step S7. If the process is not repeated for the number of request sources (S6, No), the process returns to step S1 and the subsequent processes are repeated.

In step S7, it is determined whether or not the excessive allocation bandwidth bw_excess _{j, k} is larger than a threshold value −bw_ref × (N−1). Here, N is the number of ONUs. The threshold value is not limited to this, and an arbitrary value is used as necessary.

If the excessively allocated bandwidth bw_excess _{j, k} is larger than the threshold value −bw_ref × (N−1) (S7, Yes), it is determined whether or not the process has been repeated for the number of request sources (S9). . If the process has been repeated for the number of request sources (S9, Yes), the process ends. If the processing is not repeated for the number of request sources (S9, No), the process returns to step S7 and the subsequent processing is repeated.

Further, when the excess allocation bandwidth bw_excess _{j, k} is equal to or less than −bw_ref × (N−1) (S7, No), 0 is assigned to bw_excess _{j, k} of all ONUs, and the process is performed. finish. By this process, it is possible to prevent the excess allocated bandwidth bw_excess _{j, k} from overflowing.

  In the calculation of the next period, the threshold value may be set to a value equal to or less than −bw_ref × (N−1) in which the variable representing the overallocated bandwidth processed by the CPU does not overflow. Further, the value to be compared with the threshold value may be the sum of the excess bandwidth allocation amounts of all ONUs.

In step S8, bw_excess _{j, k} of all ONUs is set to 0. However, it is detected that the overallocated bandwidth bw_excess _{j, k} is decreased not exceeding all ONUs but exceeding the threshold value. Only bw_excess _{j, k} may be set to 0. Further, the value to be reset need not be 0.

As described above, according to the OLT in the present embodiment, when the overallocated bandwidth bw_excess _{j, k} is equal to or less than the threshold value, 0 is assigned to bw_excess _{j, k} of all ONUs or individual ONUs. As a result, it is possible to prevent the variable indicating the excessive allocation bandwidth from overflowing.

(Second Embodiment)
The schematic configuration of the OLT in the second embodiment of the present invention is the same as the schematic configuration of the OLT in the first embodiment of the present invention shown in FIG.

  FIG. 3 is a flowchart for explaining the processing procedure of the control frame processing unit 13 in the second embodiment of the present invention. Note that the processing procedure of steps S11 to S14 shown in FIG. 3 is the same as the processing procedure of steps S1 to S4 shown in FIG. 2, and therefore detailed description of the processing procedure will not be repeated.

In step S15, the required bandwidth _{Q j} from _{ONU, k} is the target allocated bandwidth bw_target _j, less than _k, and the ONU allocated bandwidth bw_temp _{j, k} is the requested bandwidth _{Q j,} whether equal to _k is determined (S15).

If the requested bandwidth Q _{j, k} from the ONU is smaller than the target allocated bandwidth bw_target _{j, k} and the allocated bandwidth bw_temp _{j, k of the} ONU is equal to the requested bandwidth Q _{j, k} (S15, Yes), the excessive allocated bandwidth bw_add 0 is substituted into _{j and k} (S16). In this process, when all the bandwidths are permitted for an ONU having a bandwidth request amount less than the target allocated bandwidth bw_target _{j, k} , it is considered that the transmission permission for the ONU is not excessive or insufficient. This means that the ideal allocation amount in the period is equal to the bandwidth request amount regardless of the past allocation.

If the requested bandwidth Q _{j, k} from the ONU is not less than the target assigned bandwidth bw_target _{j, k} or the assigned bandwidth bw_temp _{j, k of the} ONU is not equal to the requested bandwidth Q _{j, k} (S15, No), (Bw_temp _{j, k} −bw_ideal _{j, k} ) is substituted into the excessively allocated bandwidth bw_add _{j, k} (S17).

  Finally, it is determined whether or not the process has been repeated for the number of request sources (S18). If the process is repeated for the number of request sources (S18, Yes), the process ends. If the number of request sources is not repeated (S18, No), the process returns to step S11 and the subsequent processes are repeated.

  In step S15, it may be determined whether or not transmission permission for the entire requested amount has been given to an ONU that requests only a band that can be regarded as being excessively smaller than the contracted band or the guaranteed band.

As described above, according to the OLT according to the present embodiment, when the transmission permission for all requested amounts is given to an ONU that requests only a band that can be regarded as being too small with respect to the target band, the excessively allocated band bw_add _Since 0 is substituted for _{j and k} , it is possible to prevent the variable indicating the excessively allocated bandwidth from overflowing.

  In addition, since the lost bandwidth is not accumulated in the over-allocated bandwidth, the function that decides whether or not to allow transmission depending on whether the ideal bandwidth is positive or negative can now work correctly. .

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a block diagram which shows schematic structure of OLT in the 1st Embodiment of this invention. It is a flowchart for demonstrating the process sequence of the control frame process part 13 in the 1st Embodiment of this invention. It is a flowchart for demonstrating the process sequence of the control frame process part 13 in the 2nd Embodiment of this invention. 6 is a flowchart for explaining a dynamic bandwidth allocation method disclosed in Japanese Patent Laid-Open No. 2003-87283.

Explanation of symbols

  1 OLT, 11, 14 Receiver, 12, 16 Transmitter, 13 Control frame processor, 15 Buffer memory.

Claims (7)

An optical subscriber line terminal device that transmits a bandwidth allocation amount with respect to a requested bandwidth from a plurality of optical subscriber line termination devices,
Receiving means for receiving a required bandwidth amount from the optical subscriber line terminating device;
The next time that the optical subscriber line terminating device is allocated to the optical subscriber line terminating device based on the requested bandwidth amount of the optical subscriber line terminating device received by the receiving means and the cumulative value of the bandwidth allocated amount previously allocated to the optical subscriber line terminating device. Control means for setting a predetermined value as a cumulative value of the bandwidth allocation amount when a cumulative value of the bandwidth allocation amount exceeds a threshold value,
And an optical subscriber line terminal station apparatus including transmission means for transmitting the bandwidth allocation determined by the control means to the optical subscriber line termination apparatus. An optical subscriber line terminal device that transmits a bandwidth allocation amount with respect to a requested bandwidth from a plurality of optical subscriber line termination devices,
Receiving means for receiving a required bandwidth amount from the optical subscriber line terminating device;
The next time that the optical subscriber line terminating device is allocated to the optical subscriber line terminating device based on the requested bandwidth amount of the optical subscriber line terminating device received by the receiving means and the cumulative value of the bandwidth allocated amount previously allocated to the optical subscriber line terminating device. And the required bandwidth amount from the optical subscriber line terminator is smaller than a target value of the bandwidth that can be allocated at a predetermined period, and the total required amount is allocated to the optical subscriber line terminator. Control means for setting a predetermined value in advance in the accumulated value of the bandwidth allocation amount,
And an optical subscriber line terminal station apparatus including transmission means for transmitting the bandwidth allocation determined by the control means to the optical subscriber line termination apparatus.   3. The optical subscriber line terminal station apparatus according to claim 2, wherein the target value of the band is a band determined based on a contract band or a guaranteed band of the optical subscriber line termination device. A dynamic bandwidth allocation method for determining a bandwidth allocation amount for a requested bandwidth from a plurality of optical subscriber line terminating devices,
Based on the received requested bandwidth amount of the optical subscriber line termination device and the cumulative value of the bandwidth allocation amount previously allocated to the optical subscriber line termination device, the next bandwidth allocation amount to be allocated to the optical subscriber line termination device is A step to determine;
And a step of setting a predetermined value as a cumulative value of the bandwidth allocation amount when the cumulative value of the bandwidth allocation amount exceeds a threshold value. A dynamic bandwidth allocation method for determining a bandwidth allocation amount for a requested bandwidth from a plurality of optical subscriber line terminating devices,
Based on the received requested bandwidth amount of the optical subscriber line termination device and the cumulative value of the bandwidth allocation amount previously allocated to the optical subscriber line termination device, the next bandwidth allocation amount to be allocated to the optical subscriber line termination device is A step to determine;
When the requested bandwidth amount from the optical subscriber line terminating device is smaller than the target value of the bandwidth that can be allocated at a predetermined cycle, and the total requested amount is allocated to the optical subscriber line terminating device, the bandwidth allocated amount And a step of setting a predetermined value to a cumulative value of the dynamic bandwidth allocation method. A computer program for causing a computer to execute a dynamic bandwidth allocation method for determining a bandwidth allocation amount for a requested bandwidth from a plurality of optical subscriber line terminating devices,
The dynamic band allocation method is based on the received requested bandwidth amount of the optical subscriber line termination device and the cumulative value of the bandwidth allocation amount previously allocated to the optical subscriber line termination device. Determining the next bandwidth allocation to be allocated to
And a step of setting a predetermined value as a cumulative value of the bandwidth allocation amount when the cumulative value of the bandwidth allocation amount exceeds a threshold value. A computer program for causing a computer to execute a dynamic bandwidth allocation method for determining a bandwidth allocation amount for a requested bandwidth from a plurality of optical subscriber line terminating devices,
The dynamic band allocation method is based on the received requested bandwidth amount of the optical subscriber line termination device and the cumulative value of the bandwidth allocation amount previously allocated to the optical subscriber line termination device. Determining the next bandwidth allocation to be allocated to
When the requested bandwidth amount from the optical subscriber line terminating device is smaller than the target value of the bandwidth that can be allocated at a predetermined cycle, and the total requested amount is allocated to the optical subscriber line terminating device, the bandwidth allocated amount And a step of setting a predetermined value to a cumulative value of the computer program.

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