JP6646568B2 - Band allocation device and band allocation method - Google Patents

Description

  The present invention relates to a band allocation device and a band allocation method.

  There is a radio communication system in which an antenna unit (RRH: Remote Radio Head) of a radio base station and a signal processing unit (BBU: Baseband Unit) are separated. In this wireless communication system, the RRH and the BBU are connected via an optical device and an optical fiber, and this optical section is called a mobile fronthaul (MFH). FIG. 6 is a diagram illustrating a configuration example of a mobile fronthaul.

  Studies have been made to accommodate RRHs using a TDM-PON (Time Division Multiplexing-Passive Optical Network) system (for example, see Non-Patent Document 1). In the TDM-PON system, a TDMA (Time Division Multiple Access) method is used for transmitting a signal from an optical terminal unit (ONU: Optical Network Unit) to an optical terminal unit (OLT: Optical Line Terminal). Therefore, when the RRH is accommodated using the TDM-PON, the traffic transferred to the MFH is estimated based on the traffic information between the RRH and the wireless terminal, and the bandwidth allocated from the optical terminal device to the optical terminal device is adjusted. There has been proposed a method of changing the frequency (for example, see Non-Patent Document 2).

  FIG. 7 is a schematic block diagram illustrating a functional configuration of a conventional terminal device. In a conventional terminal device such as an OLT, an upstream signal or a downstream signal in communication with a terminal device such as an ONU is acquired by a traffic information acquisition unit. The traffic information acquired by the traffic information acquisition unit is stored in a storage circuit. The traffic information extraction unit estimates a traffic pattern based on several hours to several days of traffic information. In late nights and early mornings, the traffic volume is smaller than during the day, because the wireless terminals are used less frequently. During the day, the wireless terminal is frequently used, so that the traffic volume also increases. A pattern representing such an increase or decrease in traffic volume is defined as a traffic pattern.

FIG. 8 is a diagram illustrating a band allocation method by the band allocation function unit according to the related art. The terminal device transmits the bandwidth allocation amount and the transmission permission time of the uplink signal to the terminal device in a DBA (Dynamic Bandwidth Allocation) cycle. From time _{t 0} to time _{t 2} a traffic collection period for the estimation of traffic patterns, defining the period and the monitoring period _{T monitor.} The bandwidth allocation function unit allocates a fixed bandwidth allocation amount R _p [bps (bits per second)] to the terminating device in each DBA cycle. Terminal equipment starts the bandwidth allocation of the variable at time _{t 2} after the monitoring period _{T monitor} is terminated. The bandwidth allocation function unit determines the bandwidth allocation amount based on the average traffic amount that is the average value of the traffic amounts acquired during the monitoring period T _monitor . For example, the bandwidth allocation amount in the period T _allo [1] is R ₁ [bps]. Bandwidth allocator is in each DBA cycle of the period _{T alloc} [1], fixedly assigning the bandwidth allocation amount _{R 1} to terminator. For example, the period _T alloc [1] = 6.0 h, the DBA cycle 250 [mu] s (microseconds), when a bandwidth allocation amount _R 1 = 1.0 Gbps, the end station device of 1.0 Gbps per 250 [mu] s to the end device Continue to allocate bandwidth for 6.0 hours. In Non-Patent Document 2, a terminal station device calculates a bandwidth allocation amount to be allocated to a terminal device based on the following equation 1.

Here, B _alloc indicates the bandwidth allocation amount, μ indicates the average traffic amount, and σ indicates the variance of the estimation result of the traffic amount. n is a constant calculated from the risk factor, and the larger the value of n, the larger the bandwidth allocation and the more the estimation error can be reduced. Traffic transferred from the terminal device lower apparatus (RRH) is causing cases occur queuing delay in the buffer circuit in the termination device over a bandwidth allocation amount B _alloc allocated from the terminal station device to the terminal device. In the conventional method, it has been considered that the traffic is monitored by the terminal station device, and when the traffic exceeding the set threshold is detected by the estimation error detection unit, the band allocation function unit switches from the variable band allocation to the fixed band allocation. . Here, detecting traffic exceeding the set threshold value is referred to as estimation error detection. After switching the band allocation, the traffic information extraction unit estimates the traffic pattern again. Then, after the above-mentioned estimation of the bandwidth allocation amount, this information is stored in the storage circuit, and the bandwidth allocation function unit starts the bandwidth allocation.

"Basic Technology Course [GE-PON Technology], 1st PON", [online], 2005, NTT Technical Journal, [Searched on December 7, 2016], Internet <URL http: // www. ntt.co.jp/journal/0508/files/jn200508071.pdf> T. Kobayashi, H. Ou, D. Hisano, T. Shimada, J. Terada and A. Otaka, “Bandwidth Allocation scheme based on Simple Statistical Traffic Analysis for TDM-PON based Mobile Fronthaul”, OFC 2016, W3C.7pdf.

  However, when an estimation error is detected as in the conventional method, switching to fixed band allocation and re-estimation of the traffic pattern are used, switching of band allocation occurs frequently, and operation is performed in a fixed band allocation state. May continue. In this case, there is a problem that the bandwidth allocation cannot be reduced.

  In view of the above circumstances, an object of the present invention is to provide a technique capable of reducing a bandwidth allocation amount.

  One aspect of the present invention is that, for each lower-level device connected to a terminating device, a traffic information acquisition unit that acquires traffic information indicating a time-series traffic amount of communication performed by the lower-level device via the terminating device; For each lower-level device, a traffic information extraction unit that extracts a fluctuation period of traffic from the traffic information, and an estimation error detection unit that detects an estimation error of traffic based on the traffic information acquired by the traffic information acquisition unit. A traffic information calculation unit that divides the extracted fluctuation cycle into one or more time slots, and for each of the time slots, calculates a bandwidth allocation amount based on a traffic amount in the time slot indicated by the traffic information; When an estimation error is detected by the error detection unit, the risk factor used for calculating the bandwidth A constant correction unit for correcting the constant that is based on said the band allocation amount calculated by the traffic information calculation unit, a bandwidth allocating device; and a bandwidth allocator for performing bandwidth allocation to said terminal device.

  One aspect of the present invention is the above-mentioned band allocation device, wherein the estimation error detection unit is configured to determine that a traffic amount obtained from the traffic information is equal to or greater than a first threshold or smaller than the first threshold. If the traffic estimation error is less than the second threshold value, the traffic estimation error is detected.

  One aspect of the present invention is the above-mentioned band allocation device, wherein the constant correction unit performs the correction of the constant step by step, and the traffic information calculation unit is configured to update the constant every predetermined number of times. , Calculate the bandwidth allocation so that the bandwidth allocation increases or decreases.

  One embodiment of the present invention is the above-described band allocation apparatus, wherein the band allocation function unit detects an estimation error by the estimation error detection unit, before the correction of the constant by the constant correction unit. The bandwidth allocation to the terminal device is switched to a bandwidth allocation based on a fixed bandwidth allocation amount.

  One aspect of the present invention is that, for each lower-level device connected to a terminating device, a traffic information acquiring step of acquiring traffic information indicating a time-series traffic amount of communication performed by the lower-level device via the terminating device; For each lower-level device, a traffic information extraction step of extracting a traffic fluctuation period from the traffic information, and an estimation error detection step of detecting an estimation error of traffic based on the traffic information acquired in the traffic information acquisition step. Dividing the extracted fluctuation cycle into one or more time slots, and calculating, for each of the time slots, a bandwidth allocation amount based on a traffic amount in the time slot indicated by the traffic information; When an estimation error is detected by an error detection unit, A constant correction step of correcting a constant obtained from the risk factor used for calculating the equivalent, and a bandwidth allocation function step of performing bandwidth allocation to the terminal device based on the bandwidth allocation amount calculated in the traffic information calculation step, Is a bandwidth allocation method having the following.

  According to the present invention, it is possible to reduce a bandwidth allocation amount.

FIG. 1 is a diagram illustrating a configuration of an access network system 8 of the present embodiment. FIG. 2 is a schematic block diagram illustrating a functional configuration of a terminal device 1 according to the first embodiment. 3 is a flowchart illustrating a flow of processing of the terminal device 1 according to the first embodiment. FIG. 9 is a schematic block diagram illustrating a functional configuration of a terminal device 1a according to a second embodiment. It is a flow chart which shows the flow of processing of terminal unit 1a in a 2nd embodiment. It is a figure showing the example of composition of a mobile front hall. FIG. 10 is a schematic block diagram illustrating a functional configuration of a conventional terminal device. FIG. 11 is a diagram illustrating a band allocation method by a band allocation function unit according to the related art.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of the access network system 8 of the present embodiment. The access network system 8 has a configuration in which a relay transmission system including the terminal station device 1, the terminal device 2, and the optical splitter 3 accommodates a communication system including the upper device 5 and the lower device 6. To accommodate a communication system means to relay communication in the communication system.

  The relay transmission system is, for example, an optical relay transmission system such as a PON (Passive Optical Network) system. When the relay transmission system is a PON system, the terminal device 1 is an optical terminal device (OLT: Optical Line Terminal), and the terminal device 2 is an optical terminal device (ONU: Optical Network Unit). The direction from the terminal device 1 to the terminal device 2 is downward, and the direction from the terminal device 2 to the terminal device 1 is upward. The optical splitter 3 distributes a TDM (time division multiplex) optical signal transmitted from the terminal device 1 through one optical fiber 41 to the optical fibers 42 connected to each of the plurality of terminating devices 2. The optical splitter 3 multiplexes a TDMA (time division multiple access) optical signal transmitted from the optical fiber 42 connected to each of the plurality of terminating devices 2 and outputs the multiplexed optical signal to the optical fiber 41. The terminal device 1 has a function as a band allocating device that allocates a band to each terminal device 2.

The communication system is, for example, a mobile network. When the communication system is a mobile network, the upper device 5 is a BBU and the lower device 6 is an RRH. The RRH performs wireless communication with a mobile wireless terminal. The relay transmission system can accommodate a plurality of communication systems.
Hereinafter, a plurality of embodiments of the terminal device 1 included in the access network system 8 will be described.

(First embodiment)
FIG. 2 is a schematic block diagram illustrating a functional configuration of the terminal device 1 according to the first embodiment. The terminal device 1 includes an upper transmission / reception function unit 11, a lower transmission / reception function unit 12, a traffic information acquisition unit 13, a storage circuit 14, a traffic information extraction unit 15, a traffic information calculation unit 16, an estimation error detection unit 17, a constant correction unit 18, and a bandwidth allocation function unit 19.

  The upper transmission / reception function unit 11 is an interface that performs communication with the upper device 5. The upper transmission / reception function unit 11 outputs a downstream signal addressed to the lower device 6 received from the upper device 5 to the lower transmission / reception function unit 12. Also, the upper transmission / reception function unit 11 transmits an upstream signal from the lower device 6 to the upper device 5 received from the lower transmission / reception function unit 12 to the upper device 5.

  The lower transmission / reception function unit 12 is an interface that performs communication with the terminating device 2. The lower transmission / reception function unit 12 converts a downlink signal output from the upper transmission / reception function unit 11 or a control signal output from the band allocation function unit 19 from an electric signal to an optical signal and outputs the signal to the terminating device 2. The lower transmission / reception function unit 12 converts an upstream signal received from the terminating device 2 from an optical signal to an electric signal, and outputs an upstream signal addressed from the lower device 6 to the higher device 5 to the upper transmission / reception function unit 11. Further, the lower transmission / reception function unit 12 transfers the upstream signal to the traffic information acquisition unit 13. The lower transmission / reception function unit 12 may output only the upstream main signal to the traffic information acquisition unit 13.

The traffic information acquisition unit 13 monitors the traffic of the uplink signal. The traffic information acquisition unit 13 outputs traffic information indicating a traffic monitoring result to the storage circuit 14 and the estimation error detection unit 17. Hereinafter, the traffic monitoring result is, for example, time-series traffic data in which the time is associated with the traffic amount of the uplink signal transmitted from each lower-level device 6.
The storage circuit 14 stores the traffic information acquired by the traffic information acquisition unit 13.

  The traffic information extraction unit 15 extracts a traffic pattern that is a traffic fluctuation cycle for each terminal device 2 based on traffic information for several hours to several days stored in the storage circuit 14. The traffic information extraction unit 15 outputs the extracted traffic pattern for each terminal device 2 to the traffic information calculation unit 16.

Based on the traffic pattern output from the traffic information extraction unit 15, the traffic information calculation unit 16 sets a period from the start to the end of one traffic pattern (corresponding to the traffic period T _period in FIG. 8) for one or more times. Divide into slots. Next, the traffic information calculation unit 16 calculates a statistic of the traffic volume in each time slot based on the traffic information for each terminal device 2. The statistics of the traffic volume are an average traffic volume (average value) in each time slot and a variance of the traffic volume. After that, the traffic information calculation unit 16 calculates the bandwidth allocation amount for each time slot by using the above-described equation 1 based on the calculated statistic and the risk rate calculated in advance or the risk rate calculated by the constant correction unit 18. calculate. The traffic information calculation unit 16 transfers the end and start timing of each time slot and the bandwidth allocation amount for each time slot to the bandwidth allocation function unit 19.

  The estimation error detection unit 17 detects an estimation error of the traffic based on the traffic information output from the traffic information acquisition unit 13. Specifically, first, the estimation error detection unit 17 compares the traffic amount included in the traffic information with a preset first threshold value. Next, the estimation error detection unit 17 determines that a traffic estimation error has occurred when the traffic amount exceeds a first threshold value set in advance. In this case, the estimation error detection unit 17 instructs the constant correction unit 18 to correct the constant n.

The constant correction unit 18 updates the constant n in Equation 1 when the estimation error detection unit 17 detects a traffic estimation error. Specifically, the constant correction unit 18 updates the constant n to a value larger than the constant n set when the estimation error occurred. For example, the constant correction unit 18 updates the value of the constant n as n = n + 1. It is obvious from the above equation 1 that the larger the value of the constant n is, the more the bandwidth allocation increases. For this reason, the constant correction unit 18 can increase the amount of traffic that the terminal device 2 can transmit.
The bandwidth allocation function unit 19 dynamically switches the bandwidth allocation amount of the terminal device 2 based on the calculation result of the bandwidth allocation amount by the traffic information calculation unit 16.

FIG. 3 is a flowchart illustrating a flow of processing of the terminal device 1 according to the first embodiment. In the description of FIG. 3, a process of detecting a traffic estimation error in the terminal station device 1 will be described.
The traffic information acquisition unit 13 sets the threshold _Eth used for estimation error detection in the estimation error detection unit 17 (Step S101). For example, a preset value may be used as the threshold value _Eth , or a value input using an input device may be used. Note that the threshold value _Eth is a value smaller than the bandwidth allocation amount B _alloc . The traffic information acquisition unit 13 acquires the reception traffic Tr (t) via the lower transmission / reception function unit 12 (Step S102). The traffic information acquisition unit 13 outputs the acquired reception traffic Tr (t) to the storage circuit 14 and the estimation error detection unit 17.

The estimation error detection unit 17 determines whether or not the output reception traffic Tr (t) is equal to or _larger than the first threshold _Eth (Step S103). If the obtained reception traffic Tr (t) is not equal to or greater than the first threshold value _Eth (step S103-NO), the terminal device 1 repeatedly executes the processing of step S102 and thereafter. Note that, when the acquired reception traffic Tr (t) is not equal to or _larger than the set threshold value _Eth , the terminal device 1 may perform a conventional band allocation process.

  Specifically, the traffic information extraction unit 15 first extracts a traffic pattern from the traffic information acquired by the traffic information acquisition unit 13. Next, the traffic information calculation unit 16 divides the period from the start to the end of one traffic pattern into one or more time slots, and calculates the bandwidth allocation amount for each time slot using the above equation (1). Then, the bandwidth allocation function unit 19 dynamically switches the bandwidth allocation amount of the terminal device 2 based on the calculation result of the bandwidth allocation amount by the traffic information calculation unit 16.

On the other hand, when the obtained received traffic Tr (t) is equal to or _larger than the first threshold value _Eth (step S103-YES), the estimation error detection unit 17 determines that an estimation error of the traffic has occurred. In this case, the estimation error detection unit 17 instructs the constant correction unit 18 to correct the constant n (Step S104). The constant correction unit 18 updates the constant n according to the instruction from the estimation error detection unit 17 (Step S105). Specifically, first, the constant correction unit 18 acquires the constant n already set from the traffic information calculation unit 16. Next, the constant correction unit 18 updates the value of the constant n by adding a predetermined value (for example, 1) to the obtained value of the constant n. Note that the constant correction unit 18 may acquire the constant n already set from the storage circuit 14.

The constant correction unit 18 transfers the updated value of the constant n to the traffic information calculation unit 16 (Step S106). The traffic information calculation unit 16 calculates the bandwidth allocation amount B _alloc using the above equation 1 based on the value of the transferred constant n and the statistics obtained from the traffic pattern stored in the storage circuit 14. Then, the value of the bandwidth allocation B _alloc is updated (step S107). Here, the traffic pattern used for calculating the bandwidth allocation amount B _alloc is the latest traffic pattern stored in the storage circuit 14. Then, the traffic information acquisition unit 13, the threshold value _{E th} is calculated, updates the value of the threshold _{E th} (step S108). Specifically, the traffic information acquisition unit 13 updates the predetermined percentage of the newly calculated bandwidth assignment amount B _alloc (e.g., 80%) a value corresponding to the value of a new threshold E _th. Then, the traffic information acquisition unit 13 sets the updated threshold _Eth in the estimation error detection unit 17.

After that, the estimation error detection unit 17 determines whether or not the reception traffic Tr (t) is equal to or more than the updated first threshold value _Eth (Step S109). When the reception traffic Tr (t) is equal to or greater than the updated first threshold value _Eth (step S109-YES), the terminal device 1 repeatedly executes the processing from step S104.
On the other hand, when the reception traffic Tr (t) is not equal to or greater than the updated first threshold value _Eth (step S109-NO), the bandwidth allocation function unit 19 _adds the bandwidth allocation amount _Balloc calculated in the process of step S107 to The bandwidth allocation is started based on this (step S110).

  According to the terminal device 1 configured as described above, when an estimation error is detected, the constant is corrected based on the risk factor without performing fixed band allocation to the terminal device 2, and the constant is corrected. Is performed using the bandwidth. As a result, it is possible to prevent the operation in the state of the fixed band allocation from continuing. Therefore, the bandwidth between the terminal device 1 and the terminal device 2 can be effectively used, and the bandwidth allocation amount can be reduced.

<Modification>
In this embodiment, the final bandwidth allocation amount B _alloc is, Tr (t) <= is shown a structure of repeating the loop process until the E _th, the addition of the constant n without performing the loop process only once It may be configured to do so. In such a configuration, when the estimation error detection unit 17 detects the estimation error again during the operation after adding the constant n, the constant correction unit 18 corrects the constant n, and the constant n Are sequentially updated.
The presence or absence of the equal sign in the present embodiment may be changed as appropriate.
In the present embodiment, the value to be added to the constant n is 1, but it is not necessary to be limited to this. For example, the value added to the constant n may be an arbitrary constant of 2 or more.
In the present embodiment, the constant n is updated when the value exceeds the threshold value _Eth even once, but the constant n may be updated when the number exceeds a preset number.

(Second embodiment)
In the second embodiment, when the estimation error detection unit detects an estimation error, the bandwidth allocation function unit switches from variable bandwidth allocation to fixed bandwidth allocation as in the conventional method. Then, after switching to the fixed bandwidth allocation, the constant correction unit corrects the constant n.
FIG. 4 is a schematic block diagram illustrating a functional configuration of the terminal device 1a according to the second embodiment. The terminal device 1a includes an upper transmission / reception function section 11, a lower transmission / reception function section 12, a traffic information acquisition section 13, a storage circuit 14, a traffic information extraction section 15, a traffic information calculation section 16, an estimation error detection section 17, a constant correction unit 18, and a band allocation function unit 19a.

  The terminal station device 1a differs from the terminal device 1 in that the terminal station device 1a includes a band allocation function unit 19a instead of the band allocation function unit 19. The terminal device 1a is the same as the terminal device 1 in other configurations. Therefore, description of the entire terminal station device 1a is omitted, and the band allocation function unit 19a will be described.

  When the estimation error detection unit 17 detects an estimation error, the band assignment function unit 19a switches the band assignment to the terminating device 2 from the variable band assignment to the fixed band assignment.

FIG. 5 is a flowchart illustrating a flow of processing of the terminal device 1a according to the second embodiment. In FIG. 5, the same processes as those in FIG. 3 are denoted by the same reference numerals as those in FIG.
In the process of step S103, when the obtained received traffic Tr (t) is equal to or _larger than the first threshold value _Eth (step S103-YES), the estimation error detection unit 17 determines that an estimation error of the traffic has occurred. The estimation error detection unit 17 notifies the band allocation function unit 19 that a traffic estimation error has occurred (step S201). After that, based on the notification from the estimation error detection unit 17, the bandwidth allocation function unit 19a switches the bandwidth allocation to the terminating device 2 from the variable bandwidth allocation to the fixed bandwidth allocation (Step S202). After that, the processes after step S105 are executed.

According to the terminal device 1a configured as described above, the same effect as in the first embodiment can be obtained.
Further, when an estimation error is detected, the terminal station device 1a switches the bandwidth allocation method to the fixed bandwidth allocation once, and then corrects the constant based on the risk factor. This makes it possible to gradually reduce the bandwidth allocation amount from the fixed bandwidth allocation.

<Modification>
The second embodiment may be modified in the same manner as the first embodiment.

(Third embodiment)
In the third embodiment, it is assumed that the traffic transferred from the terminating device is significantly smaller than the bandwidth allocation. Specifically, during the monitoring period T _monitor illustrated in FIG. 8, the terminal station device performs the bandwidth assignment with the bandwidth assignment amount calculated based on Expression 1 in the acquired reception traffic, but varies the bandwidth assignment amount. Sometimes traffic is significantly less. For example, mobile carriers limit the amount of communication traffic of each user on a monthly basis. For this reason, it is estimated that the traffic of the user tends to decrease as the month approaches.

Therefore, in the third embodiment, a lower limit threshold value _Ethlow is newly provided in the estimation error detection unit. In this case, the estimation error detecting section sets the first separate first optional second threshold _{E Thlow} smaller than the threshold value _{E th} of the threshold _{E th} in the first embodiment. If the acquired reception traffic Tr (t) falls below the second threshold value E _thlow for a certain period of the arbitrarily designated period after the band allocation is variably switched from the fixed band allocation, the constant correction unit The value of the constant n is decremented (for example, n = n-1). In addition, if the bandwidth allocation is variably changed from the fixed bandwidth allocation and is always below the second threshold value E _thlow for an arbitrarily designated period, the terminal device monitors again with the bandwidth allocation varied and performs the bandwidth allocation. Perform quantity update processing.

According to the terminal device in the third embodiment configured as described above, the same effects as in the first embodiment can be obtained.
In the terminal device according to the third embodiment, when the value is lower than the second threshold value _Ethlow , the constant correction unit decrements the value of the constant n. It is obvious from Equation 1 that the smaller the value of the constant n, the smaller the bandwidth allocation amount. Therefore, it becomes possible to reduce the bandwidth allocation amount.

  Some functions of the terminal devices 1 and 1a in the above-described embodiment may be realized by a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read and executed by a computer system. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in a computer system. Further, the “computer-readable recording medium” refers to a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line, and dynamically holds the program for a short time. Such a program may include a program that holds a program for a certain period of time, such as a volatile memory in a computer system serving as a server or a client in that case. Further, the above-mentioned program may be for realizing a part of the above-mentioned functions, and may be for realizing the above-mentioned functions in combination with a program already recorded in the computer system.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments and includes a design and the like within a range not departing from the gist of the present invention.

1, 1a: terminal station device, 2: terminal device, 3: optical splitter, 5: upper device, 6: lower device, 11: upper transmission / reception function unit, 12: lower transmission / reception function unit, 13: traffic information acquisition unit, 14 ... Storage circuit, 15 ... Traffic information extraction unit, 16 ... Traffic information calculation unit, 17 ... Estimation error detection unit, 18 ... Constant correction unit, 19, 19a ... Band allocation function unit

Claims (5)

For each lower device connected to the terminating device, a traffic information acquisition unit that acquires traffic information indicating a time-series traffic amount of communication performed by the lower device via the terminating device,
For each of the lower-level devices, a traffic information extraction unit that extracts a traffic fluctuation cycle from the traffic information,
Based on the traffic information acquired by the traffic information acquisition unit, based on an estimation error detection unit that detects an estimation error of the traffic,
A traffic information calculation unit that divides the extracted fluctuation period into one or more time slots, and calculates, for each of the time slots, a bandwidth allocation amount based on a traffic amount in the time slot indicated by the traffic information;
When an estimation error is detected by the estimation error detection unit, a constant correction unit that corrects a constant obtained from the risk factor used for calculating the bandwidth allocation amount,
Based on the bandwidth allocation calculated by the traffic information calculation unit, based on the bandwidth allocation function unit that performs bandwidth allocation to the terminal device,
Equipped with a,
The constant correction unit performs the correction of the constant step by step,
The bandwidth allocation device, wherein the traffic information calculation unit calculates the bandwidth allocation amount such that the bandwidth allocation amount increases or decreases every time the constant is updated a predetermined number of times . For each lower device connected to the terminating device, a traffic information acquisition unit that acquires traffic information indicating a time-series traffic amount of communication performed by the lower device via the terminating device,
For each of the lower-level devices, a traffic information extraction unit that extracts a traffic fluctuation cycle from the traffic information,
Based on the traffic information acquired by the traffic information acquisition unit, based on an estimation error detection unit that detects an estimation error of the traffic,
A traffic information calculation unit that divides the extracted fluctuation period into one or more time slots, and calculates, for each of the time slots, a bandwidth allocation amount based on a traffic amount in the time slot indicated by the traffic information;
When an estimation error is detected by the estimation error detection unit, a constant correction unit that corrects a constant obtained from a risk factor used for calculating the bandwidth allocation amount,
Based on the bandwidth allocation calculated by the traffic information calculation unit, based on the bandwidth allocation function unit that performs bandwidth allocation to the terminal device,
Equipped with a,
The band allocation function unit, when an estimation error is detected by the estimation error detection unit, before the correction of the constant by the constant correction unit, the band allocation to the terminal device to the band allocation by a fixed band allocation amount. Bandwidth assignment device to switch . The estimation error detection unit is configured to estimate an error in the traffic when a traffic amount obtained from the traffic information is equal to or more than a first threshold or less than a second threshold that is a value smaller than the first threshold. detecting a band allocation device as claimed in claim 1 or 2. For each lower device connected to the terminating device, a traffic information acquisition step of acquiring traffic information indicating a time-series traffic amount of communication performed by the lower device through the terminating device,
For each of the lower-level devices, a traffic information extraction step of extracting a traffic fluctuation period from the traffic information,
Based on the traffic information acquired in the traffic information acquisition step, based on the estimation error detection step of detecting an estimation error of the traffic,
A traffic information calculating step of dividing the extracted fluctuation cycle into one or more time slots, and for each of the time slots, calculating a bandwidth allocation amount based on a traffic amount in the time slot indicated by the traffic information;
When an estimation error is detected by the estimation error detection unit, a constant correction step of correcting a constant obtained from a risk factor used for calculating the bandwidth allocation amount,
Based on the bandwidth allocation calculated in the traffic information calculation step, based on the bandwidth allocation function step of performing bandwidth allocation to the terminal device,
Have a,
In the constant correction step, the constant is corrected stepwise,
In the traffic information calculation step, a bandwidth allocation method for calculating the bandwidth allocation such that the bandwidth allocation increases or decreases every time the constant is updated a predetermined number of times . For each lower device connected to the terminating device, a traffic information acquisition step of acquiring traffic information indicating a time-series traffic amount of communication performed by the lower device through the terminating device,
For each of the lower-level devices, a traffic information extraction step of extracting a traffic fluctuation period from the traffic information,
Based on the traffic information acquired in the traffic information acquisition step, based on the estimation error detection step of detecting an estimation error of the traffic,
A traffic information calculating step of dividing the extracted fluctuation cycle into one or more time slots, and for each of the time slots, calculating a bandwidth allocation amount based on a traffic amount in the time slot indicated by the traffic information;
When an estimation error is detected by the estimation error detection unit, a constant correction step of correcting a constant obtained from a risk factor used for calculating the bandwidth allocation amount,
Based on the bandwidth allocation calculated in the traffic information calculation step, based on the bandwidth allocation function step of performing bandwidth allocation to the terminal device,
Have a,
In the bandwidth allocation function step, when an estimation error is detected in the estimation error detection step, the bandwidth allocation to the terminal device is changed to a bandwidth allocation by a fixed bandwidth allocation amount before the correction of the constant in the constant correction step. toggle its bandwidth allocation method.

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