JP4961994B2 - BAND USE CONTROL SYSTEM, BAND USE CONTROL METHOD, DEVICE AND ITS PROGRAM - Google Patents

Description

  The present invention relates to a bandwidth usage control system, a communication terminal, a bandwidth management device, a bandwidth usage control method, and a bandwidth usage control program for a shared network, and in particular, bandwidth usage control that enables the bandwidth of a shared portion to be used fairly and effectively. The present invention relates to a system, a communication terminal, a bandwidth management device, a bandwidth usage control method, and a bandwidth usage control program.

  Regarding bandwidth usage control in the case where a certain fixed bandwidth is shared by a plurality of communications executed simultaneously by a plurality of communication subjects, for example, Patent Document 1 discloses that a plurality of terminals perform packet communication using a predetermined wireless bandwidth. A reception band management method in such a system is described.

  In the reception band management method described in Patent Document 1, a shared band between a wireless LAN access point (AP) and a connected device is controlled by an AP. As an operation, when a bandwidth is allocated in accordance with a preset usage band for communication from each device connected to the AP and a new communication is started, if the total usage band is equal to or greater than the shared bandwidth, the AP is predetermined. Stop existing communications according to rules (eg priority). An example of control is shown below.

  First, as a precondition, the bandwidth of the shared part is 10 Mbps. Further, it is assumed that both the device A and the device B are currently communicating in the usage band of 5 Mbps.

  Here, the device C newly starts communication with the use bandwidth of 3 Mbps. The AP uses the total bandwidth (5 + 5 + 3 = 13 Mbps) over the shared bandwidth (10 Mbps). For example, the AP stops communication of the device B with the lowest priority, and 3 Mbps is allocated to the device C accordingly. assign.

  In Patent Document 1, a preset usage band may be a fixed value corresponding to a device or a communication protocol, or may be specified by a user who uses the device. Examples of settings include “TV always uses 10 Mbps with priority 1”, “Web access on PC is 1 Mbps”, and the like.

JP 2003-273879 A

  However, the reception band management method described in Patent Document 1 does not provide any support for determination of a specific band value in use band setting. For example, when an appropriate bandwidth value is not set, an unfairness may occur in which a bandwidth is tight in one device and a delay occurs, but another device cannot be used up and is wasted. In addition, for example, even if the bandwidth is tight in a certain communication, there may be a state where a bandwidth that is not yet used remains in the shared bandwidth. In addition, with regard to bandwidth allocation when communication is newly started, there is a possibility that a bandwidth that is not yet used remains in the shared bandwidth while the existing communication is stopped.

  The first problem is that there is a possibility of unfair use of bandwidth between communications, such as there is a wasteful bandwidth that is not used in another communication while there is a shortage of bandwidth in one communication. The reason is that a bandwidth setting that is not excessive or insufficient according to the actual communication amount is not performed.

  The second problem is that even when the bandwidth is tight in each communication, there is a possibility that there is still a usable bandwidth as the bandwidth of the shared portion. This is because the additional bandwidth according to the actual communication situation is not used.

  Accordingly, an object of the present invention is to provide a bandwidth usage control system, a communication terminal, a bandwidth management device, a bandwidth usage control method, and a bandwidth usage control program based on an upper and lower limit bandwidth according to actual traffic. To do. Another object of the present invention is to make it possible to use an additional band according to the communication status of each communication.

The band use control system according to the present invention is a band use control system for controlling the use of a shared band, which is a communication band shared by each communication terminal, in a communication system in which a plurality of communication terminals share a communication band for communication. The communication terminal includes a plurality of communication terminals and a bandwidth management device that manages the use of the shared bandwidth, and the communication terminal performs a bandwidth of communication performed by the communication terminal based on the upper limit bandwidth determined by the bandwidth management device. Use band control means for controlling (for example, use band control means 115) and upper limit increase request means for requesting the band management device to increase the upper limit band of the communication when the lack of the communication band is detected (for example, use band control means) with the possibility bandwidth calculating means 212) and the band management apparatus, the presence or absence of a request to increase the upper limit bandwidth of each communication, on the basis of the assignment content of shared bandwidth, the communication terminal performs through Was determined for each of the types, by determining the increase or reduction from the standard band is just enough communicable bandwidth, the available bandwidth to determine an upper limit band indicating the upper limit of the communication bandwidth available in the communication Computation means (for example, available bandwidth calculation means 212) is provided, and the available bandwidth calculation means targets communication for which a bandwidth larger than the standard bandwidth is allocated as an upper limit bandwidth when the shared bandwidth is insufficient. was reduced to the standard range up to, but still less bandwidth than a standard band of the communication limit band of at least one communication among the communication to be started more current allocating communications or new if shared bandwidth is insufficient It is characterized by securing a communication band to be allocated to other communications by reducing the number of times.

  The band usage control system may determine the standard band using the past communication history.

  In addition, the bandwidth management device includes a communication information storage unit (for example, a communication information storage unit 222) that stores at least an upper limit bandwidth actually allocated as information indicating a type of each communication and a bandwidth control status, Standard bandwidth determination means (for example, standard bandwidth calculation means 213) for determining a standard bandwidth for each type of communication may be provided based on information indicating the bandwidth control status stored in the communication information storage means.

  In addition, the available bandwidth calculation means may be used when there is no shared bandwidth when communication is newly started and there is no communication in which a bandwidth larger than the standard bandwidth is allocated as the upper limit bandwidth. For all communication including newly started communication, the upper limit bandwidth may be reduced so as to be smaller than the standard bandwidth, thereby securing a communication band to be allocated to newly started communication.

  In addition, the bandwidth management device includes an upper limit increase request storage unit (for example, an upper limit increase request storage unit 224) that temporarily stores the content when an increase in the upper limit bandwidth is requested when the shared bandwidth is insufficient, and calculates available bandwidth. The means may increase the upper limit band according to the contents stored in the upper limit increase request storage means after the shortage of the shared band is resolved.

  In addition, the communication terminal is triggered by an input operation from the user indicating dissatisfaction with the service quality of the service involving communication executed on the communication terminal, and the data amount and upper limit bandwidth of the communication actually performed in the service The bandwidth shortage detection means (for example, the bandwidth shortage determination means 112) for detecting the bandwidth shortage may be provided by comparing the amount of communicable data indicated by.

  In addition, the communication terminal is triggered by a notification from an application unit (for example, the application unit 114) that executes a service involving communication on the communication terminal, and the data amount and upper limit bandwidth of the communication actually performed in the service. The bandwidth shortage detection means (for example, the bandwidth shortage determination means 112) for detecting the bandwidth shortage may be provided by comparing the amount of communicable data indicated by.

In addition, a communication terminal according to the present invention is a band use control system that controls the use of a shared band, which is a communication band shared by each communication terminal, in a communication system in which a plurality of communication terminals share a communication band for communication. a communication terminal that is applied to the bandwidth control of communication by the communication and the communication terminal the communication terminal starts is performed, notified from the bandwidth management apparatus for managing a shared bandwidth, determined for each of the communication types This is the upper limit bandwidth of the communication determined by determining the amount of increase or reduction from the standard bandwidth that can be communicated without excess or deficiency , and the bandwidth management device is larger than the standard bandwidth when the shared bandwidth is insufficient For communications with a bandwidth allocated as the upper limit bandwidth, the upper limit bandwidth of the communication is reduced to the standard bandwidth at the maximum, and if the shared bandwidth is still insufficient, the current allocation is further reduced. At least one row intends available bandwidth based on the highest bandwidth is a communication bandwidth reserved by the upper band of the communication is reduced to less bandwidth than a standard band of the communication in the communication or newly initiated the communication in Te It is characterized by comprising control means and upper limit increase request means for requesting the bandwidth management device to increase the upper limit bandwidth of the communication when a shortage of the communication bandwidth is detected.

Also, the bandwidth management device according to the present invention is a bandwidth usage control that controls bandwidth usage of a shared bandwidth, which is a communication bandwidth shared by each communication terminal, in a communication system in which a plurality of communication terminals share a communication bandwidth for communication. A bandwidth management device applied to the system, and when there is a request for an increase in the upper limit bandwidth of each communication transmitted when each communication terminal detects a lack of communication bandwidth of communication performed by the communication terminal , The upper limit bandwidth of each communication is determined by determining the amount of increase or reduction from the standard bandwidth, which is a bandwidth that can be communicated without excess or deficiency, for each type of communication performed by the communication terminal based on the content of the allocation. with the available bandwidth calculation unit, the available bandwidth calculating means, when shortage shared bandwidth, upper band of the communication larger bandwidth than the standard band intended for communication that are assigned as upper band If the shared bandwidth is still insufficient, the upper limit bandwidth of at least one communication among the currently allocated communication or the newly started communication is smaller than the standard bandwidth of the communication. It is characterized by securing a communication band to be allocated to other communications by reducing the number of times .

In addition, the bandwidth usage control method according to the present invention is applied to a communication system in which a plurality of communication terminals share a communication band and perform communication, and controls the bandwidth usage of a shared band that is a communication band shared by each communication terminal. A bandwidth management method for managing the bandwidth usage of a shared bandwidth is a bandwidth usage control method for each communication transmitted when each communication terminal detects a lack of communication bandwidth of communication performed by the communication terminal . The amount of increase or reduction from the standard bandwidth, which is the bandwidth that can be communicated without excess or deficiency, defined for each type of communication performed by the communication terminal based on the presence or absence of an increase request for the upper limit bandwidth and the shared bandwidth allocation content by determining, in the process of determining the upper limit bandwidth of each communication, shared bandwidth on low, the limit band of the communication to the target communications greater bandwidth than the standard bandwidth is allocated as the upper limit band If the shared bandwidth is still insufficient, the upper limit bandwidth of at least one of the currently allocated communication or newly started communication is set to a bandwidth smaller than the standard bandwidth of the communication. By reducing the number, a communication band allocated to other communication is secured .

  Further, the bandwidth management device stores at least the upper limit bandwidth actually allocated as information indicating the bandwidth control status, and based on the stored bandwidth control status information, the standard bandwidth for each communication type May be determined.

  In addition, when the bandwidth management device newly starts communication, when the shared bandwidth is insufficient, and there is no communication in which a bandwidth larger than the standard bandwidth is allocated as the upper limit bandwidth, For all communications including newly started communications, the upper limit bandwidth may be reduced so as to be smaller than the standard bandwidth.

  In addition, when the bandwidth management device is requested to increase the upper limit bandwidth when the shared bandwidth is insufficient, the content is temporarily saved, and after the shared bandwidth shortage is resolved, the upper limit bandwidth is set according to the request for the increase of the temporarily stored upper limit bandwidth. It may be increased.

  In addition, the communication terminal is triggered by an input operation from the user indicating dissatisfaction with the service quality of the service involving the communication executed on the communication terminal, and the data amount and the upper limit bandwidth of the communication actually performed in the service The lack of bandwidth may be detected by comparing the amount of communicable data indicated by.

  In addition, communication data that is indicated by the data amount and the upper limit bandwidth of communication that is actually performed in the service, triggered by a notification from an application unit that executes a service that involves communication on the communication terminal. Band shortage may be detected by comparing the amount.

The band use control program according to the present invention is a band for controlling the use of a shared band, which is a communication band shared by each communication terminal, in a communication system in which a communication band is shared by a plurality of communication terminals. A bandwidth use control program applied to a management device, wherein a request for increasing an upper limit bandwidth of each communication transmitted to a computer when a shortage of a communication bandwidth of communication performed by the communication terminal is detected from each communication terminal Each communication is determined by determining the amount of increase or decrease from the standard bandwidth, which is a bandwidth that can be communicated without excess or deficiency, for each type of communication performed by the communication terminal based on the presence / absence and the shared bandwidth allocation content. split the available bandwidth calculation processing for determining the upper limit band is executed, in the available bandwidth calculation process, when the lack of shared bandwidth is greater bandwidth than the standard band is the upper limit band If the upper limit bandwidth of the communication is reduced to the standard bandwidth at the maximum, and if the shared bandwidth is still insufficient, at least one of the currently assigned communication or the newly started communication Is reduced to a bandwidth smaller than the standard bandwidth of the communication, thereby securing a communication bandwidth to be allocated to other communications .

  The first effect is that a necessary and sufficient bandwidth can be used in each communication. As a result, problems such as delay due to lack of bandwidth do not occur in each communication, and other communication is not disturbed by occupying the bandwidth of the shared portion. This is because a necessary and sufficient bandwidth for each communication condition is held as a standard bandwidth, and bandwidth utilization control is performed using the standard bandwidth.

  The second effect is that even if there is a shortage of bandwidth in each communication, the waste that there is a bandwidth that is not used in the shared portion is eliminated. As a result, the lack of communication bandwidth is resolved according to the unused bandwidth of the shared portion. The reason is that the upper limit bandwidth of each communication is changed based on the bandwidth shortage status of each communication and the bandwidth usage status of the shared portion.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration example of a band use control system according to the first embodiment of the present invention. The band use control system shown in FIG. 1 is a communication system in which a plurality of communication terminals 1 (communication terminals 1-1 to 3) are accommodated by a higher-level network switch 4 via a network switch 3 and communicate while sharing a band. This is an example in which the bandwidth control according to the present invention is applied. In the present embodiment, a bandwidth management server 2 is further provided as shown in FIG. The bandwidth management server 2 is connected to a network switch 3 that forms an internal network accommodated by the host network switch 4.

  In the present embodiment, the bandwidth allocated to the network switch 3 by the upper network switch 4 corresponds to the bandwidth of the shared portion (hereinafter simply referred to as the shared bandwidth) in a plurality of communication terminals.

  In the present embodiment, in addition to the communication unit 111 and the application unit 114, the communication terminal 1 includes a bandwidth shortage determination unit 112, a control content display unit 113, a use band control unit 115, and a communication type analysis unit 116. A standard band information storage unit 121. Specifically, the communication unit 111, the bandwidth shortage determination unit 112, the control content display unit 113, the application unit 114, the use band control unit 115, and the communication type analysis unit 116 are realized by the data processing device 11 that operates according to a program such as a CPU. Is done. The standard band information storage unit 121 is realized by the storage device 12 such as a memory.

  The communication unit 111 performs transmission / reception control of communication data. The bandwidth shortage determining unit 112 determines whether or not the upper limit bandwidth indicated as the upper limit of the used bandwidth is insufficient with respect to the current communication amount. If the bandwidth is insufficient, the bandwidth management server 2 increases the upper limit bandwidth. Request. The control content display means 113 displays the current bandwidth control content to the user. The application unit 114 executes various application programs that perform predetermined functions by performing communication. The use band control unit 115 controls the use band so that the use band of communication falls within the upper limit band instructed by the band management server 2 for the communication performed by the application unit 114. The communication type analysis unit 116 analyzes the communication type of network communication performed by the application unit 114.

  The standard band information storage unit 121 includes information (specifically, information indicating a necessary and sufficient band (standard band) in a normal communication state for each communication type performed by at least the communication terminal including the standard band information storage unit 121. Information indicating bandwidth) is stored. Hereinafter, information indicating a necessary and sufficient bandwidth (standard bandwidth) in a normal communication state is referred to as standard bandwidth information. The standard band information stored in the communication terminal 1 is the same information as the standard band information stored in the band management server 2.

  The bandwidth management server 2 also includes a communication unit 211, an available bandwidth calculation unit 212, a standard bandwidth information storage unit 221, a communication information storage unit 222, a shared bandwidth information storage unit 223, and an upper limit increase request storage unit 224. Including. Specifically, the communication unit 211 and the available bandwidth calculation unit 212 are realized by the data processing device 21 that operates according to a program such as a CPU. Further, the standard band information storage unit 221, the communication information storage unit 222, the shared band information storage unit 223, and the upper limit increase request storage unit 224 are realized by the storage device 22 such as a memory.

  The communication unit 211 performs transmission / reception control of communication data. The available bandwidth calculation means 212 determines the upper limit bandwidth of each communication in order to optimize the use of the shared bandwidth on the basis of the standard bandwidth.

  The standard band information storage unit 221 stores standard band information indicating the standard band for each communication type of communication performed in the shared band. The communication information storage unit 222 stores information (communication information) necessary for controlling the use of the shared band for each communication performed in the shared band. For example, the communication identifier for identifying the communication, the communication type, the upper limit of the available bandwidth permitted at the present time (current upper limit bandwidth), and the largest available bandwidth (maximum upper limit bandwidth) ) And a terminal identifier for identifying a communication terminal performing communication. In the present embodiment, the communication information storage unit 222 includes a communication identifier for identifying each communication, a communication destination, a protocol, a current upper limit band, a maximum upper limit band, a standard band, and an identifier of a terminal device that is executing the communication. And remember.

  The shared band information storage unit 223 stores information related to the shared band. In the present embodiment, the shared band information storage unit 223 stores at least the capacity (bandwidth) of the shared band. The upper limit increase request storage unit 224 receives an upper limit increase request for requesting an increase in the upper limit band for communication performed in the shared band from the communication terminal, but can allocate a bandwidth when the increased bandwidth cannot be allocated. Temporarily save the request until

  Next, the operation of the bandwidth usage control system according to the present embodiment will be described. The operation of this system is divided into three operations: communication start, upper limit bandwidth increase request, and communication end.

  First, the communication start operation will be described. FIG. 2 is a flowchart illustrating an example of a communication start operation in the bandwidth usage control system. For example, it is assumed that the user of the communication terminal 1 starts using an application provided by the application unit 114. When the application unit 114 needs to communicate with another device, the application unit 114 starts communication using the communication unit 111 (step A11). When communication is started using the communication unit 111, the use band control unit 115 passes data necessary for analysis out of the communication data to the communication type analysis unit 116 and requests analysis of the communication type of the started communication. The communication type analysis unit 116 analyzes the received communication data and determines the communication type (step A12). The communication type analysis unit 116 may determine the communication type based on, for example, the communication destination or protocol identifier included in the communication data. The communication type here is a type classified into a level in which a necessary and sufficient band (that is, a standard band) is determined to some extent in a normal communication state. For example, a communication protocol (SMTP, POP, The communication type may be identified by IMAP, HTTP, FTP, or the like. In addition, if you want to classify standard bands not only according to the communication protocol but also according to the communication destination, you can classify by the combination of URL and communication protocol. May be. In the present embodiment, an example will be described in which a classification determined by a combination of a communication protocol used by an application used by a user and a communication destination of communication using the communication protocol is used as a communication type.

  When the communication type is analyzed by the communication type analysis unit 116, the use band control unit 115 acquires the standard band in the communication type of the started communication. For example, the use band control unit 115 searches the standard band information storage unit 121 for the standard band determined for the communication type of the started communication, and acquires the standard band. If the standard band is found, the use band control of the communication is started with the standard band as the current upper limit band (step A13). For example, as the bandwidth control, the use bandwidth control unit 115 measures the communication data amount, and when the communication data amount exceeds the capacity indicated as the upper limit bandwidth, discards or delays the corresponding data. Control.

  When the standard band is unknown, for example, in the case of communication under conditions that have not been implemented at all, the use band control unit 115 may set a predetermined band as the standard band.

  Further, the use band control means 115 notifies the band management server 2 that communication in the shared band has been started (step A14). For example, the use band control means 115 determines a communication identifier that can uniquely identify communication within the communication terminal, and identifies the communication terminal that performs communication and information indicating the communication type together with the communication identifier. A communication start notification including a terminal identifier for transmission is transmitted to the bandwidth management server 2. Note that information (communication destination or protocol) for determining the communication type may be transmitted instead of the information indicating the communication type.

  Further, the control content display means 113 displays the content of the usage band control by the usage band control means 115 to the user of the communication terminal (step A15). The control content display means 113 generates, for example, a display screen that displays a list of applications, communication destinations, and current bandwidths used for communication for each communication executed on the communication terminal 1, and displays the screen. Information is output to a display device (not shown) included in the terminal device 1.

  When the bandwidth management server 2 receives the communication start notification from the communication terminal 1, the available bandwidth calculation unit 212 allows an upper limit bandwidth that is currently acceptable for communication related to the communication start notification (hereinafter referred to as start communication). To decide. First, the available bandwidth calculation unit 212 acquires a standard bandwidth for start communication. (Step A21). For example, the available bandwidth calculation unit 212 searches the standard bandwidth information storage unit 221 for the standard bandwidth defined for the communication type included in the communication start notification from the communication terminal 1, and acquires the standard bandwidth. For example, the available bandwidth calculating unit 212 determines a predetermined communication type from the communication destination or protocol included in the communication start notification, and displays information indicating the standard bandwidth associated with the determined communication type as standard bandwidth information. You may search from the preservation | save part 221. FIG.

  Next, the available bandwidth calculation unit 212 acquires the current upper limit bandwidth of all the communications being executed from the communication information storage unit 222 and stores the total (allocated capacity) and the shared bandwidth information storage unit 223. The capacity of the remaining band (shared partial remaining band) that can be used in the shared band is calculated by comparing the capacity (bandwidth) of the shared band.

  If the standard bandwidth of the start communication is smaller than the calculated available remaining bandwidth (Yes in step A22), since it can be allocated without any problem, the standard bandwidth is used as the current upper limit bandwidth as it is in the communication information storage unit 222. Information related to the start communication is stored (step A27). The available bandwidth calculating means 212 stores, for example, the communication destination of the start communication, the protocol, the current upper limit bandwidth, the maximum upper limit bandwidth, the standard bandwidth, the communication identifier, and the terminal identifier of the communication terminal being executed in the communication information storage unit 222. Let Here, the value of the standard band may be registered as it is in the maximum upper limit band.

  On the other hand, when the standard bandwidth of the start communication is larger than the calculated available remaining bandwidth (No in Step A22), the available bandwidth calculation means 212 can communicate with the standard bandwidth as much as possible. In addition, the bandwidth used for existing communications is adjusted. First, the available bandwidth calculation means 212 searches for communication using a bandwidth that is equal to or higher than the standard bandwidth during the existing communication, and calculates the sum of differences from the standard bandwidth in these communications (that is, additional allocation). Then, the calculated total additional allocated bandwidth is compared with the standard bandwidth of the started communication. As a result of comparison, if the total additional allocated bandwidth can compensate for the shortage of the shared partial remaining bandwidth with respect to the standard bandwidth of the start communication, that is, if the total additional allocated bandwidth is larger than the shortage of the shared partial residual bandwidth (in step A23) Yes), the standard bandwidth of the start communication is secured by reducing the additional allocation of the already allocated communication (step A24). The available bandwidth calculation means 212 secures the standard bandwidth for the start communication by lowering the upper limit bandwidth of the additional allocated communication to the standard bandwidth by the shortage of the shared partial remaining bandwidth.

  On the other hand, when the total additional allocated bandwidth cannot compensate for the shortage of the shared partial remaining bandwidth with respect to the standard band of the started communication, that is, when the total additional allocated bandwidth is smaller than the shortage of the shared partial remaining bandwidth (step A23). No), in addition to reducing the additional allocation of additional allocated communication, in addition to reducing the upper limit bandwidth to be smaller than the standard bandwidth for all communications (including the start communication), the standard of the start communication A bandwidth equivalent is secured (step A25). The available bandwidth calculation means 212 secures the equivalent of the standard bandwidth of the start communication by reducing the upper limit bandwidth of the communication to be reduced to the standard bandwidth or less by the standard bandwidth allocated to the start communication. Here, “equivalent to the standard band” is an expression including the upper limit band when the start communication is a target for reduction of the upper limit band. That is, if the upper limit band of the start communication is reduced, the reduced upper limit band is ensured as being equivalent to the standard band.

  For example, the available bandwidth calculating unit 212 can reduce the upper limit bandwidth for all target communication in both cases of reducing the upper limit bandwidth of additional allocated communication and reducing the upper limit bandwidth for all communications. The reduction target and the reduction amount may be determined and reduced according to a predetermined rule, such as a method of uniformly reducing the amount of communication, a method of selecting communication according to the communication type, and a method of weighting and reducing the selected communication.

  Finally, the available bandwidth calculation means 212 notifies the communication terminal that has performed communication with a reduced upper limit bandwidth that the upper limit bandwidth has been reduced (step A26). The available bandwidth calculation unit 212 transmits, for example, an upper limit bandwidth change notification including a communication identifier of communication whose upper limit bandwidth has been lowered and a new upper limit bandwidth. In addition, the available bandwidth calculation unit 212 updates the information in the communication information storage unit 222 for the communication with the lower limit bandwidth (step A27). For example, the value of the current upper limit band stored in the communication information storage unit 222 in association with the communication identifier of the communication whose upper limit band has been lowered is changed to a new upper limit band value and stored.

  In the communication terminal 1 that has received the upper limit band change notification, the use band control unit 115 changes the band control condition (upper limit band) of the communication to be changed, and the changed band control condition (that is, reduction) Bandwidth control is performed in accordance with the set upper limit bandwidth) (step A16). In addition, with the change of the band control condition, the control content display unit 113 updates the display of the band control content (step A17).

  In FIG. 2, the operation of step A16 and step A17 is shown by taking as an example the case where the upper limit bandwidth of the communication terminal that is performing the start communication is lowered. The communication terminal that is performing is not limited to the communication terminal that is executing the start communication.

  Next, the upper limit bandwidth increase request operation will be described. FIG. 3 is a flowchart illustrating an example of the upper limit bandwidth increase request operation in the bandwidth usage control system. As shown in FIG. 3, when the user of the communication terminal 1 feels dissatisfied with the communication performance while using the application provided by the application unit 114, the bandwidth control content is displayed by the control content display unit 113. Using the screen, the fact that there is dissatisfaction with the communication performance of the corresponding communication is input (step B11). In response to such a user operation, the control content display unit 113 requests the bandwidth shortage determination unit 112 to investigate whether or not the dissatisfaction is caused by a shortage of bandwidth for a communication that is input that a certain communication is unsatisfactory. For example, the control content display unit 113 notifies the bandwidth shortage determination unit 112 of the input content from the user and the current control content.

  The bandwidth shortage determining unit 112 accesses the communication unit 111 and investigates the communication amount of communication in which the communication performance is dissatisfied. The bandwidth shortage determination unit 112 measures the amount of communication performed via the communication unit 111, compares the actual communication amount with the capacity of the upper limit bandwidth used as a condition for use bandwidth control, and determines whether the bandwidth is insufficient. Determine whether or not. For example, the bandwidth shortage determination unit 112 may determine that the bandwidth is insufficient if the communication amount is equal to or greater than a certain ratio with respect to the capacity of the upper limit bandwidth.

  The bandwidth shortage determining unit 112 notifies the control content display unit 113 of the determination result, and when determining that the bandwidth is insufficient (step B12), the bandwidth shortage determining unit 112 notifies the bandwidth management server 2 via the communication unit 111 of the upper limit bandwidth per bandwidth shortage. Is notified that an increase in the request is required (step B13). The bandwidth shortage determination unit 112 transmits, for example, an upper limit increase request including the communication identifier of the communication determined to be insufficient bandwidth and the terminal identifier of the communication terminal to the bandwidth management server 2. Further, the control content display means 113 updates the display of the bandwidth control content so that it can be understood that the communication is insufficient in bandwidth and is requesting an increase in the upper limit bandwidth based on the determination result by the insufficient bandwidth determination means 112. (Step B14), or notifies the user that the cause of dissatisfaction felt by the user is not the communication band (Step B15).

  In addition, when the bandwidth management server 2 receives the upper limit increase request from the communication terminal 1, the available bandwidth calculation unit 212 allows an upper limit that is currently acceptable for communication related to the upper limit increase request (hereinafter referred to as request communication). Determine the amount of bandwidth increase. First, the available bandwidth calculating unit 212 searches the communication information storage unit 222 for the current upper limit bandwidth of all the communications being executed, and calculates the capacity of the shared partial remaining bandwidth.

  When the shared partial remaining bandwidth is 0 (No in Step B22), since there is no bandwidth allocated as an increase in the upper limit bandwidth at this time, the upper limit increase request is stored in the upper limit increase request storage unit 224 (Step B29). The available bandwidth calculation unit 212 may store, for example, the terminal identifiers of the communication terminals 1 that have requested the upper limit increase request in the upper limit increase request storage unit 224 in the order received. When the shared partial remaining bandwidth is larger than 0 (Yes in step B22), the available bandwidth calculating unit 212 determines the increase amount of the upper limit bandwidth allocated to the requested communication (step B23). The increase amount to be allocated may be uniform, may be a constant amount with respect to the current upper limit band, or may be changed according to the communication type.

  When the increase amount is determined, the available bandwidth calculating means 212 compares the increase amount with the shared partial remaining bandwidth. If the increase amount is equal to or less than the shared partial remaining bandwidth, the available bandwidth calculating means 212 sets the upper limit bandwidth with the determined increase amount as it is. Increase (Yes in step B24, step B26). On the other hand, when the increase amount is larger than the shared partial remaining bandwidth, the upper limit bandwidth is increased by the shared partial remaining bandwidth (No in Step B24, Step B25).

  In either case, the available bandwidth calculation means 212 notifies the requesting communication terminal 1 of the increase amount of the upper limit bandwidth together with the communication identifier (step B27), and sends information related to the corresponding communication in the communication information storage unit 222. Update (step B28). The available bandwidth calculation means 212 transmits, for example, an upper limit bandwidth change notification including a communication identifier and a new upper limit bandwidth, and the current upper limit bandwidth and the maximum upper limit bandwidth of the requested communication stored in the communication information storage unit 222. The value is updated to a new upper limit band value.

  In addition, when the communication terminal 1 receives the upper limit band change notification, the use band control unit 115 changes the band control condition (upper limit band) of the communication to be changed, and the changed band control condition Band control is performed according to (that is, the increased upper limit band) (step B16). Then, along with the change of the band control condition, the control content display unit 113 updates the display of the band control content (step B17). In response to the increase of the upper limit bandwidth of the communication requesting the increase of the upper limit bandwidth, the control content display means 113 terminates the display indicating that the increase of the upper limit bandwidth is being requested, and displays the new upper limit bandwidth. You can do it.

  Next, the communication end operation will be described. FIG. 4 is a flowchart showing an example of a communication end operation in the bandwidth usage control system. As shown in FIG. 4, for example, when communication by the application unit 114 is completed (step C11), the use band control unit 115 notifies the band management server 2 that communication in the shared band has been completed (step C12). ), The use bandwidth control of the communication is terminated. For example, the use band control unit 115 transmits a communication end notification including a communication identifier and a terminal identifier of the communication terminal that is performing communication to the band management server 2. Then, the control content display unit 113 updates the display of the usage band control content in response to the end of the usage band control by the usage band control unit 115 (step C13). Specifically, the control content display unit 113 ends the display of the usage band control content related to the communication.

  When the bandwidth management server 2 receives the communication end notification from the communication terminal 1, the available bandwidth calculation unit 212 ends the bandwidth management related to the communication related to the communication end notification (hereinafter referred to as end communication). First, the available bandwidth calculation means 212 searches whether the upper limit increase request for the end communication is stored in the upper limit increase request storage unit 224, and deletes the request if there is a corresponding request (step C22). ). Next, the available bandwidth calculating unit 212 acquires the current upper limit bandwidth of the end communication from the communication information storage unit 222, and searches for an allocation destination of the bandwidth corresponding to the current upper limit bandwidth of the end communication that can be used in the shared portion ( Step C23).

  FIG. 5 is a flowchart showing an example of an operation for determining a bandwidth allocation destination that has become available. As shown in FIG. 5, the available bandwidth calculation means 212 searches the communication information storage unit 222 after setting the current upper limit bandwidth of the end communication as an assignable bandwidth, and first, the current upper limit bandwidth is smaller than the standard bandwidth. It is confirmed whether or not communication exists (step C231). Here, the communication whose current upper limit bandwidth is smaller than the standard bandwidth specifically refers to the standard bandwidth of the start communication even if the total additional allocated bandwidth is added to the available remaining bandwidth at the start of other communication or own communication. Is a communication in which the band (upper limit band) currently allowed to be used is lower than the standard band (necessary and sufficient band).

  When there is communication whose current upper limit band is smaller than the standard band, the band is allocated within the range of the allocatable band so that the upper limit band of the communication is as much as possible (Yes in step C231, step C232). If an allocatable bandwidth still remains after this allocation, the next allocation destination is searched using the bandwidth remaining after the allocation as the allocatable bandwidth (step C233).

  When there is no communication whose current upper limit bandwidth is smaller than the standard bandwidth, or when communication is still possible after allocation to these communications, the available bandwidth calculation means 212 searches the communication information storage unit 222 again, and It is confirmed whether or not there is communication whose upper limit band is smaller than the maximum upper limit band (step C234). Here, the communication in which the current upper limit band is smaller than the maximum upper limit band specifically means that after the upper limit band is increased by the upper limit increase request, the standard band for communication that is started in the remaining available band is secured. When this is not possible, it is a communication in which the currently permitted bandwidth (upper limit bandwidth) is lower than the actually required bandwidth (maximum upper limit bandwidth).

  If there is a communication whose current upper limit band is smaller than the maximum upper limit band, the band is allocated within the range of the allocatable band so that the upper limit band of those communications is as high as possible (Yes in step C234). , Step C235). If an allocatable bandwidth still remains after this allocation, the next allocation destination is searched using the bandwidth remaining after the allocation as the allocatable bandwidth (step C236).

  When there is no communication whose current upper limit bandwidth is smaller than the maximum upper limit bandwidth, or when allocation is still possible after allocation to these communications, the available bandwidth calculation means 212 sends an upper limit increase request to the upper limit increase request storage unit 224. Is not stored (step C237). That is, it is confirmed whether or not there is communication that has requested an increase in the upper limit bandwidth but has not yet been assigned. If there is an upper limit increase request in the upper limit increase request storage unit 224, allocation is performed as much as possible in order from the oldest request (step C238). Here, among the communication stored in the upper limit increase request storage unit 224, the communication already assigned in steps C232 and C235 may be deleted as the upper limit has been increased. Note that the bandwidth allocation operation for the upper limit increase request is the same as the upper limit bandwidth increase request operation shown in FIG.

  When the above processing is performed and the assignment destination is determined (Yes in step C24 in FIG. 4), the communication terminal 1 that is executing the communication (target communication) that is the assignment destination is notified of the increase amount of the upper limit bandwidth. (Step C25), information related to the target communication in the communication information storage unit 222 is updated (Step C26). For example, the available bandwidth calculation means 212 transmits an upper limit bandwidth change notification including the communication identifier of the target communication and the new upper limit bandwidth, and the value of the current upper limit bandwidth of the target communication stored in the communication information storage unit 222. Is updated to the value of the new upper limit bandwidth. When the upper limit band is increased in response to the upper limit increase request, the maximum upper limit band value is also updated to a new upper limit band value. Even when there is no allocation destination, the communication information storage unit 222 performs an update to delete information related to the end communication (No in Step C24, Step C26).

  In communication terminal 1 (displayed as communication terminal B in FIG. 4) that has received the upper limit band change notification, use band control means 115 changes the band control condition (upper limit band) of the communication to be changed. Then, bandwidth control is performed according to the changed bandwidth control condition (that is, the increased upper limit bandwidth) (step C31). Further, the control content display means 113 updates the display of the bandwidth control content with the change of the bandwidth control condition (step C32). When the upper limit bandwidth of the communication requesting the increase of the upper limit bandwidth is increased, the control content display means 113 terminates the display indicating that the increase of the upper limit bandwidth is being requested, and sets a new upper limit bandwidth. Display it. Note that in the case of communication not requiring an increase in the upper limit band, a new upper limit band may be simply displayed.

  In this embodiment, the necessary and sufficient bandwidth for each communication type is held as a standard bandwidth, and bandwidth use control is performed using the standard bandwidth, so communication is executed under fair conditions that match the characteristics for each communication. Is done. In addition, since the upper limit bandwidth of each communication is changed based on the bandwidth shortage situation of each communication and the bandwidth usage situation of the shared portion, it is possible to make the maximum use of the bandwidth of the shared portion.

  In the present embodiment, the standard band is automatically determined according to the communication type. For example, it is possible to secure an excessive band more than the band that is originally required, for example, when each communication sets a free value individually. It can be avoided. Accordingly, it is possible to use a fair and sufficient bandwidth in accordance with the characteristics of each communication.

  Also, in this embodiment, since the lack of bandwidth is determined on the terminal that terminates communication, for example, there is no problem as communication due to packet multiplexing as seen when determining on the communication path. There is no misrecognition of insufficient bandwidth for packet discard. Therefore, band allocation is performed only when it is actually determined that there is a problem on the communication terminal, so that useless band allocation can be avoided.

  Further, in the present embodiment, not only the bandwidth reduction from the existing communication but also a newly started communication is targeted for reduction. For example, even if the bandwidth can be secured only below the standard bandwidth, By automatically lowering the upper limit bandwidth of the start communication according to the rules, it is possible to start and continue without rejecting the communication. Then, when other communication is completed, the bandwidth is preferentially allocated, so that even if a bandwidth shortage occurs, it can be minimized.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a block diagram showing a configuration example of a band use control system according to the second embodiment of the present invention. The band usage control system shown in FIG. 6 differs from the first embodiment shown in FIG. 1 in that the control content display means 113 of the communication terminal 1 is omitted. Further, in the present embodiment, the operations of the band shortage determination unit 112 and the application unit 114 are different from those in the first embodiment. Hereinafter, in order to distinguish from the first embodiment, as shown in FIG. 6, they are respectively referred to as a band shortage determination unit 112b and an application unit 114b.

  Next, the operation of the bandwidth usage control system according to the present embodiment will be described. FIG. 7 is a flowchart illustrating an example of a communication start operation in the present embodiment. As shown in FIG. 7, the communication start operation of the present embodiment is the first operation shown in FIG. 2 except that the control content display means 113 does not perform the band control content display operation (steps A15 and A17). Since this is the same as the operation in the implementation of, the description is omitted.

  FIG. 8 is a flowchart showing an example of the upper limit band addition request operation in the present embodiment. As shown in FIG. 8, the upper limit bandwidth increase request operation in the present embodiment is different from the first embodiment shown in FIG. 3 in the operation (steps B <b> 11 to B <b> 12) for detecting insufficient bandwidth in the communication terminal 1. In the present embodiment, the band shortage determination unit 112b or the application unit 114b detects a band shortage in place of the detection based on the “dissatisfaction” input from the user.

  In the present embodiment, for example, the application unit 114b uses its own function to detect that the current communication band is insufficient. When the bandwidth shortage is detected, the application unit 114b notifies the bandwidth shortage determination unit 112b (Step E11). Alternatively, when the application unit 114b does not directly determine that the bandwidth is insufficient, for example, the application unit 114b is notified of a decrease in service or function provided by the application unit 114b, and the bandwidth shortage determination unit 112b obtains from the communication unit 111. The shortage of bandwidth may be detected by comparing the current communication amount to be used and the current communication control condition (upper limit bandwidth) by the use bandwidth control means 115 (step E12).

  The subsequent operation is the same as the operation in the first embodiment shown in FIG. 3 except that the band control content display operation (steps B15 and B17) by the control content display means 113 is not performed. Description is omitted.

  FIG. 9 is a flowchart showing an example of the communication end operation in the present embodiment. As shown in FIG. 9, the communication end operation in the present embodiment is the first operation shown in FIG. 4 except that the control content display means 113 does not perform the band control content display operation (steps C13 and C32). Since this is the same as the operation in the implementation of, the description is omitted.

  As described above, the present embodiment has an advantage that determination by the user is unnecessary because the application unit 114b or the band shortage determination unit 112b automatically recognizes the band shortage.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 10 is a block diagram showing a configuration example of a band use control system according to the third embodiment of the present invention. The band use control system shown in FIG. 10 is different from the first embodiment shown in FIG. 1 in that the band management server 2 includes a standard band calculation unit 213. In the present embodiment, the information stored in the communication information storage unit 222 is partly different from that of the first embodiment. Accordingly, the operation of the available bandwidth calculation unit 212 is also different from that of the first embodiment. Hereinafter, in order to distinguish from the first embodiment, as shown in FIG. 10, they are respectively referred to as a communication information storage unit 222c and an available bandwidth calculation unit 212c.

  The standard band calculation means 213 periodically calculates a standard band using a record of communications performed by each terminal device 1 stored in the communication information storage unit 222. The calculation result is updated and stored in the standard band information storage unit 221 and distributed to all the terminal devices 1.

  Further, for each communication, the communication information storage unit 222c further stores a communication flag indicating whether communication is in progress and a bandwidth shortage flag indicating whether an increase in the upper limit bandwidth due to insufficient bandwidth is being requested. Then, the available bandwidth calculating unit 212c manages (updates) the communication flag and the bandwidth shortage flag of the communication information storage unit 222c in response to the upper limit increase notification and the communication end notification.

  Next, the operation of the bandwidth usage control system according to the present embodiment will be described. The operation of the bandwidth usage control system according to the present embodiment includes a standard bandwidth calculation operation in addition to the communication start, the upper limit bandwidth addition request, and the communication end. Note that the communication start operation is the same as that in the first embodiment, and a description thereof will be omitted.

  FIG. 11 is a flowchart showing an example of the upper limit bandwidth increase request operation in the present embodiment. As shown in FIG. 11, the upper limit bandwidth increase request operation in the present embodiment is different from the first embodiment shown in FIG. 3 in the operation when the bandwidth management server 2 receives the upper limit increase request. In the present embodiment, the available bandwidth calculation unit 212c receives the upper limit increase request and stores it in the upper limit increase request storage unit 224 (after step B29), and then sets the bandwidth shortage flag for the corresponding communication in the communication information storage unit 222c. Turn on (step G21). Other points are the same as those of the first embodiment shown in FIG.

  FIG. 12 is a flowchart showing an example of the communication end operation in the present embodiment. As shown in FIG. 11, the communication end operation in the present embodiment is different from the first embodiment shown in FIG. 4 in the operation at the time of receiving the communication end notification in the bandwidth management server 2. In the present embodiment, when the available bandwidth calculation unit 212c receives the communication end notification, the available bandwidth calculation unit 212c does not delete the information related to the end communication in the communication information storage unit 222c and turns on the end flag (step H21). In addition, the available bandwidth calculation unit 212c turns off the insufficient bandwidth flag when the upper limit bandwidth is increased in response to the upper limit increase request when updating the information related to the assignment destination communication of the communication information storage unit 222c. (Step H21). Other points are the same as those of the first embodiment shown in FIG.

  Next, the standard band calculation operation will be described. In the present embodiment, the standard band calculation unit 213 optimizes the standard band based on communication information of communication performed in the past, for example, in a preset cycle. FIG. 13 is a flowchart showing an example of a standard bandwidth calculation operation in the bandwidth usage control system according to the present embodiment. The standard bandwidth calculation unit 213 performs the following processing on information stored for communication that ended in the past fixed period (here, communication for which the end flag is on).

  First, the communication information storage unit 222c is searched using a certain communication type as a key, and information stored for communication of the communication type that has been completed in the past fixed period is acquired (step I21). Hereinafter, information stored about communication of a specific communication type that has been acquired from the communication information storage unit 222c in the past certain period is referred to as target communication information. Based on the target communication information, the standard bandwidth calculation unit 213 counts the number of communication terminals 1 in which the bandwidth shortage has occurred, and determines whether or not the number of bandwidth shortage occurrence terminals is equal to or greater than a certain number (step I22). Specifically, the standard band calculation means 213 may count the number of communication terminals 1 that are executing communication whose band flag is turned on or communication whose maximum upper limit band is equal to or greater than the standard band.

  If communication with insufficient bandwidth has occurred in a certain number of communication terminals, the standard bandwidth calculation means 213 increases the standard bandwidth, assuming that the current standard bandwidth is insufficient (Yes in step I22). , Step I23). Specifically, a minimum value among the maximum upper limit band or the current upper limit band equal to or higher than the standard band is set as a new standard band so as to be the minimum value of the band that is not dissatisfied. Here, the reason why the minimum value is set as a new standard band is to prevent a rapid increase in the standard band. If the maximum upper limit band = the upper limit band = the standard band for all communications while the communication with insufficient bandwidth occurs in a certain number of communication terminals, a new standard band can be determined according to a predetermined rule. Good. For example, “add a certain amount to the existing standard band”, “add a certain percentage of the current standard band”, or may be determined according to the communication type. Note that the case where the maximum upper limit band = the upper limit band = the standard band in all communications is a case where a band to be allocated cannot be secured even though the band is insufficient.

  On the other hand, if the communication with insufficient bandwidth is not occurring in a certain number of communication terminals, it is determined whether the current standard bandwidth is too large (No in step I22). For example, when there is no shortage of bandwidth in a preset period, the standard bandwidth calculation unit 213 determines that the current standard bandwidth is too large and reduces the standard bandwidth (Yes in Step I24, Step I25). Specifically, the standard bandwidth calculation unit 213 may determine whether or not the number of bandwidth shortage occurrence terminals is 0. Similarly, the reduction amount may be a fixed amount, a fixed amount of the current standard band, or may be determined according to the communication type.

  When the standard band is changed, the information of the corresponding communication type in the standard band storage unit 221 is updated (step I26). The standard band calculation means 213 updates the standard band value of the corresponding communication type stored in the standard band information storage unit 221 to a new standard band value. Thereafter, after executing these processes for all the communication types of communication ended in a certain past period (step I27), information on the standard band of each communication type (standard band stored in the standard band storage unit 221) List) is distributed to all communication terminals 1 via the communication means 211 (step I28).

  As described above, the present embodiment has an advantage that the standard band is automatically determined based on the actual communication record, and the standard band is automatically corrected due to environmental changes and the like.

Embodiment 4 FIG.
Next, a fourth aspect of the present invention will be described with reference to the drawings. FIG. 14 is a block diagram showing a configuration example of a band use control system according to the fourth embodiment of the present invention. The band use control system shown in FIG. 14 combines the features of the second embodiment shown in FIG. 6 and the features of the third embodiment shown in FIG. That is, as compared with the first embodiment, the control content display means 113 is omitted, and the standard band calculation means 213 is added. In the following, as shown in FIG. 14, in order to distinguish between means having different operations and storage units having different stored contents, as in the second and third embodiments, the bandwidth shortage determining means 112b, the application means 114b, The available bandwidth calculation unit 212c and the communication information storage unit 222c are referred to.

  Next, the operation of the bandwidth usage control system according to the present embodiment will be described. The operation of the band usage control system according to the present embodiment is roughly classified into four operations: communication start, upper limit band addition request, communication end, and standard band calculation operation. Note that the communication start operation is the same as that in the second embodiment, and a description thereof will be omitted. Further, the standard band calculation operation is the same as that of the third embodiment, and thus the description thereof is omitted.

  FIG. 15 is a flowchart showing an example of the upper limit bandwidth increase request operation in the present embodiment. As shown in FIG. 11, in the upper limit bandwidth increase request operation in the present embodiment, the bandwidth shortage detection operation (steps E11 and E12) by the bandwidth shortage determination unit 112b or the application unit 114b of the communication terminal 1 and the communication terminal 1 Similar to the second embodiment, the band control content display operation (steps B15 and B17) is not performed. Further, the update operation (step G21) of the communication information storage unit 222c by the available bandwidth calculation unit 212c of the bandwidth management server 2 is the same as that of the third embodiment. Other points are the same as those in the first embodiment.

  FIG. 16 is a flowchart showing an example of the communication end operation in the present embodiment. As shown in FIG. 16, in the communication end operation in the present embodiment, the band control content display operation (steps C13 and C32) in the communication terminal 1 is not performed, as in the second embodiment. It is. Further, the update operation (step H21) of the communication information storage unit 222c by the available bandwidth calculation unit 212c of the bandwidth management server 2 is the same as that of the third embodiment. Other points are the same as those in the first embodiment.

  As described above, according to the present embodiment, the advantages of the second and third embodiments can be obtained at the same time, that is, the judgment by the user is unnecessary and the standard band is automatically determined / updated. .

  Next, the operation of the embodiment of the present invention will be described using specific examples. FIG. 17 is an explanatory diagram illustrating a configuration example of the use band control system according to the present embodiment. Such an example corresponds to the third embodiment of the present invention.

  In this embodiment, a central processing unit and a memory are used as the data processing devices 11 and 21, and a hard disk (hereinafter referred to as HDD) is used as the storage devices 12 and 22. That is, in the communication terminal 1 and the bandwidth management server 2, the central processing unit functions as each unit when the computer program on each memory is executed by the central processing unit. Also, the HDD functions as each storage unit by allocating a storage area for information stored in each storage unit on the HDD.

  As shown in FIG. 17, the network to be controlled in this embodiment is an in-company network. It is assumed that the communication terminal 1 and the bandwidth management server are connected to an intra-department network switch corresponding to the network switch 3 at 100 Mbps and constitute an internal LAN. In the present embodiment, the local LAN of the Y section is explained, but there are a plurality of similar local LANs other than the local LAN of the Y section. These local LANs are all accommodated at 1 Gbps in the backbone network switch corresponding to the upper network switch 4. That is, 1 Gbps is a band (shared band) shared by each communication terminal connected to the local LAN of the Y section.

  In addition, various servers that provide services for the company are connected to the backbone network switch, and a firewall (FW) is also connected. Further, the FW is connected to the Internet, and various communications with outside the company are possible via the Internet. Note that all communications in the network are based on the Internet protocol.

  First, the communication start operation will be described. Now, it is assumed that user A starts a remote conference application on a communication terminal (hereinafter referred to as communication terminal 1-A) and starts a remote conference. When communication with the conference server is started by the remote conference application (step A11), the central processing unit of the communication terminal 1-A analyzes the communication type from the communication data (step A12). Here, the communication destination and the communication protocol are detected as the communication type. Specifically, a set of communication destination “meeting.nec.co.jp” + communication protocol “NEC remote conference protocol (hereinafter referred to as NRMP)” is detected as a communication type.

  Next, the central processing unit of the communication terminal 1-A acquires a standard band in the communication type of the started communication. Here, on the condition of the communication destination and the communication protocol, the HDD standard band information storage unit 121 area is searched and “standard band = 4 Mbps” associated with the combination of the communication destination and the communication protocol is acquired. To do. Then, the central processing unit of the communication terminal 1-A starts bandwidth control using the found standard bandwidth (4 Mbps) as the upper limit (upper limit bandwidth) of the use bandwidth (step A13). Further, the central processing unit of the communication terminal 1-A displays the band control content including the communication that is already being executed on the screen of the communication terminal (step A15). FIG. 18 is an explanatory diagram illustrating an example of a display screen for bandwidth control content. For example, as shown in FIG. 18, for each communication being executed in the communication terminal, a display indicating an application and a communication destination of the communication execution, a current use band, and a check box for inputting dissatisfaction A screen may be generated and displayed.

  The central processing unit of the communication terminal 1-A assigns a communication identifier to the started communication simultaneously with the start of the band control, and notifies the band management server 2 of the start of communication (step A14). Here, the identifier “20060925-20” is given as the date and time + sequential value, and “communication identifier = 20060925-20”, “communication destination = meeting.nec.co.jp”, “communication protocol” are given to the bandwidth management server. A communication start notification including information “= NRMP” is transmitted.

  In the bandwidth management server 2 that has received the communication start notification, the central processing unit searches for the standard bandwidth from the area for the standard bandwidth information storage unit 221 of the HDD using the communication destination and the communication protocol included in the communication start notification. “Standard bandwidth = 4 Mbps” associated with the combination of the communication destination and the communication protocol is acquired (step A21). Further, the central processing unit of the bandwidth management server 2 obtains the value of the current upper limit bandwidth of all the communications being executed from the area for the communication information storage unit 222c of the HDD, calculates the total (allocated capacity), The capacity of the shared band (1 Gbps in this example) is acquired from the area for the shared band information storage unit 223 of the HDD. Here, it is assumed that the total (allocated capacity) of the current upper limit bandwidth of all communications is calculated as 1 Gbps. In other words, it is assumed that the capacity of the assignable shared part band (shared part remaining band) is calculated as 0 bps.

  Since the central processing unit of the bandwidth management server 2 has a standard bandwidth (4 Mbps) for starting communication larger than the available shared bandwidth (1 Gbps-1 Gbps = 0 bps) (No in step A22), the started communication is possible. The bandwidth used for existing communications is adjusted so that the standard bandwidth can be used as much as possible. The central processing unit of the bandwidth management server 2 searches for a communication in which an upper limit bandwidth larger than the standard bandwidth is set, and confirms that the total increase in the upper limit of the currently executed communication is 4 Mbps or more. It is decided to reduce the upper limit increase of the communication and secure 4 Mbps (Yes in step A23, step A24).

  FIG. 19 is an explanatory diagram illustrating an example of communication information stored in the communication information storage unit 222c area when searching for reduction targets. As shown in FIG. 19, the central processing unit of the bandwidth management server 2 sets, for example, “communication identifier = 20060924-8241” as a communication in which an upper limit bandwidth larger than the standard bandwidth is set from among currently executed communications. , “Communication identifier = 20060925-10”, “communication identifier = 20060925-11”, and “communication identifier = 20060925-12” are extracted as reduction targets. Here, it is assumed that “reduction priority is given to communication with outside the company” and “reduction to 20% from communication with a large bandwidth usage” as the reduction rules. The central processing unit of the bandwidth management server 2 searches for reduction targets according to this rule, and here, the communication terminal of user B (hereinafter referred to as communication terminal 1-B) indicated as “Term B” in the figure. Decided to reduce the upper limit bandwidth (20 Mbps) of the communication identified by “communication identifier = 20060925-11” (“communication destination = stream.example.com”, “communication protocol = RTP”) by 20%. To do. In the example shown in FIG. 19, communication identified by “communication identifier = 20060925-11” and “communication identifier = 20060925-12” are identified according to the rule “priority reduction of communication with outside the company”. Communication is targeted for reduction. First, the communication identified by “communication identifier = 20060925-11” having a large upper limit bandwidth is reduced by 20%, and 4 Mbps can be secured at this point.

  The central processing unit of the bandwidth management server 2 transmits an upper limit bandwidth change notification including information “communication identifier = 20060925-11” and “upper limit bandwidth = 16 Mbps” to the communication terminal 1-B (step A26). The value of the upper limit bandwidth of the corresponding communication stored in the communication information storage unit 222c area is changed to 16 Mbps (step A27). Further, for the newly started communication of the communication terminal 1-A, “communication identifier = 20060925-20”, “communication destination = meeting.nec.co.jp”, “communication protocol = NRMP”, “current upper limit bandwidth = 4 Mbps”, Information such as “maximum upper limit bandwidth = 4 Mbps”, “standard bandwidth = 4 Mbps”, and “terminal identifier = TermA” is stored as new communication information in the area for communication information storage unit 222c of the HDD (step A27).

  In communication terminal 1-B that has received the upper limit band change notification, the central processing unit changes the band control content on the screen (steps A16 and A17). FIG. 20 and FIG. 21 are explanatory diagrams showing an example of the display screen of the band control content. 20 shows an example of a display screen for bandwidth control content before receiving the upper limit bandwidth change notification, and FIG. 21 shows an example of a display screen for bandwidth control content after receiving the upper limit bandwidth change notification. That is, the bandwidth control content display screen indicates that the bandwidth used for communication performed by the video player application has been changed from 20 Mbps to 16 Mbps in response to the notification of the upper limit bandwidth change.

  Next, the upper limit bandwidth increase request operation will be described. It is assumed that user A is dissatisfied with the communication performance (for example, image quality) during a remote conference and user B is viewing a stream video. Therefore, both check “dissatisfied” for the corresponding communication in the control content display part on the screen (step B11).

  Here, the central processing unit of each of the communication terminals 1-A and 1-B compares the actual communication amount in the communication terminal with the capacity of the upper limit band, and confirms that the communication terminal 1-A and 1-B are fully utilized up to the upper limit band. (Step B12). Then, an upper limit increase request is transmitted to the bandwidth management server 2 (step B13). Here, the central processing unit of communication terminal 1-A makes an upper limit increase request including information “communication identifier = 20060925-20”, and the central processing unit of communication terminal 1-B receives information “communication identifier = 20060925-11”. Is transmitted to the bandwidth management server 2.

  At this time, the central processing unit of each of the communication terminals 1-A and 1-B updates the display of the bandwidth control content so that it can be understood that the communication is insufficient in bandwidth and is requesting an increase in the upper limit bandwidth. (Step B14). FIG. 22 is an explanatory diagram illustrating an example of a display screen of band control content in the communication terminal 1-B. As shown in FIG. 22, for example, a display screen is displayed in which a check box for inputting dissatisfaction is checked until the upper limit band is increased.

  In the bandwidth management server 2 that has received the upper limit increase request, the central processing unit calculates the remaining bandwidth that can be used in the shared portion as 0 bps. Since the shared partial remaining bandwidth is 0 bps, there is no bandwidth allocated for the two upper limit increase requests, and therefore each communication identifier is stored in the area for the upper limit increase request storage unit 224 of the HDD (No in step B22, step B29). ). Further, the bandwidth shortage flag of the corresponding communication stored in the HDD communication information storage unit 222c area is updated to ON (step G21).

  Next, the communication end operation will be described. When the user A finishes the remote conference (step C11), the central processing unit of the communication terminal 1-A erases the information about the remote conference communication from the display of the bandwidth control content on the screen and communicates with the bandwidth management server 2. An end notification is sent (steps C12 and C13). Here, the central processing unit of the communication terminal 1 -A transmits a communication end notification including information “communication identifier = 20060925-20” to the bandwidth management server 2. FIG. 23 is an explanatory diagram illustrating an example of a display screen of the contents of bandwidth control at the end of communication in the communication terminal 1-A. FIG. 23 shows an example in which the display about communication performed by the video player application is deleted.

  In the bandwidth management server 2 that has received the communication end notification, the central processing unit sends an upper limit increase request (that is, “communication identifier = 20060925-20” related to the remote conference communication stored in the area for the upper limit increase request storage unit 224 of the HDD. ]) Is deleted (step C22). Then, communication information related to the remote conference communication stored in the HDD communication information storage unit 222c area is searched, and the current upper limit bandwidth = 4 Mbps is acquired.

  The central processing unit of the bandwidth management server 2 searches the communication information relating to the currently executed communication stored in the HDD communication information storage unit 222c area, and determines the 4 Mbps allocation destination to be released. Here, the current upper limit band (= 16 Mbps) of the communication (communication identified by “communication identifier = 20060925-11”) used for browsing the stream video in the communication terminal 1-B is less than the maximum upper limit band (= 20 Mbps). Therefore, it is decided to allocate 4 Mbps to this communication (step C23).

  The central processing unit of the bandwidth management server 2 transmits an upper limit bandwidth change notification including information “communication identifier = 20060925-11” and “upper limit bandwidth = 20 Mbps” to the communication terminal 1-B (step C25). Also, the current upper limit bandwidth of the communication of the allocation destination (communication identified by “communication identifier = 20060925-11”) stored in the HDD communication information storage unit 222c area is updated (step H21). Here, it is assumed that “current upper limit band = 20 Mbps”. Furthermore, “band shortage flag = off” is set, and the upper limit increase request (that is, “communication identifier = 20060925-11”) related to the corresponding communication stored in the area for the upper limit increase request storage unit 224 of the HDD is deleted. Further, the end flag of the end communication (communication identified by “communication identifier = 20060925-11”) stored in the area for communication information storage unit 222c of the HDD is turned off (step H21).

  In communication terminal 1-B that has received the upper limit band change notification, the central processing unit updates the display of the band control content on the screen (step C32). Here, regarding the communication for browsing the stream moving image, the state where the check box for inputting dissatisfaction is cleared and a display screen indicating a new bandwidth is displayed. Here, a display screen in which the control content is updated from the example shown in FIG. 21 to the example shown in FIG. 20 is displayed.

  Finally, the standard band calculation operation will be described. In this example, it is assumed that the standard bandwidth calculation is performed daily at midnight. The central processing unit of the bandwidth management server 2 calculates a standard bandwidth for communication information of communications that have been completed in the past three days at midnight.

  First, target communication information is sorted by communication destination and communication protocol, and a list of unique pairs of communication destination and communication protocol is generated. Then, for each combination of a communication destination and a communication protocol, communication information indicating the combination is acquired as target communication information (step I21). 24 and 25 are explanatory diagrams illustrating examples of communication information of communication completed in the past three days. FIG. 24 shows an example of communication information of communication completed in the past three days in all communication types, and FIG. 25 shows the past in the combination of “communication destination = meeting.nec.co.jp” and “communication protocol = NRMP”. The example of the communication information (target communication information) of the communication completed in 3 days is shown. Here, for the combination of “communication destination = meeting.nec.co.jp” and “communication protocol = NRMP”, it is assumed that five pieces of communication information are acquired from different communication terminals 1 as shown in FIG. It is assumed that the maximum upper limit band> standard band in two cases, and the band shortage flag is on in the other three cases. Note that two cases of maximum upper limit band> standard band are “current upper limit band = 4.8 Mbps” and “maximum upper limit band = 4.8 Mbps”, and another case is “current upper limit band = 4.0 Mbps”. ”,“ Maximum upper limit bandwidth = 4.8 Mbps ”. The standard bandwidth of the communication type by the combination of “communication destination = meeting.nec.co.jp” and “communication protocol = NRMP” is 4.0 Mbps. The standard band calculation rule is “calculate a new standard band when bandwidth shortage occurs at 5 terminals or more”, “when reducing the standard band, reduce 10% of the current standard band ”.

  The central processing unit of the bandwidth management server 2 counts the number of communication terminals 1 that are experiencing insufficient bandwidth communication from the target communication information. Here, two of the cases are the maximum upper limit band> the standard band, and the other three cases have the band shortage flag on, and are generated in different communication terminals 1, respectively, so that the communication with insufficient band has occurred. The number of existing communication terminals 1 is calculated as 5. Then, since the number of terminals with insufficient bandwidth (= 5) is equal to or greater than the fixed number (= 5) indicated by the standard bandwidth calculation rule, it is determined to increase the standard bandwidth for the communication type.

  The central processing unit of the bandwidth management server 2 is the smallest of the maximum upper limit bandwidth or the current upper limit bandwidth that is larger than the standard bandwidth for the communication type by the combination of “communication destination = meeting.nec.co.jp” and “communication protocol = NRMP”. Is set to a new standard band. Here, the standard band is 4.0 Mbps, and one of the two cases of the maximum upper limit band> standard band is “current upper limit band = 4.8 Mbps”, “maximum upper limit band = 4.8 Mbps”, Since one case is “current upper limit band = 4.0 Mbps” and “maximum upper limit band = 4.8 Mbps”, 4.8 Mbps is set as a new standard band. Then, the corresponding item in the standard band list stored in the area for the standard band information storage unit 221 of the HDD is updated. Here, the standard bandwidth for the communication type by the combination of “communication destination = meeting.nec.co.jp” and “communication protocol = NRMP” is updated.

  Note that the communication type of a combination of “communication destination = stream.example.net” and “communication protocol = RTP”, which is a communication type for viewing a stream video performed in the communication terminal 1-B, is the communication terminal 1 Even if the communication record of -B is included, it is assumed that the standard band was not calculated because there were only three communication cases. For “communication destination = portal.nec.co.jp” and “communication protocol = HTTP”, there was no communication that had insufficient bandwidth in the past three days. Is reduced by 10% from the current 120 Kbps and set to 108 Kbps.

  The central processing unit of the bandwidth management server 2 confirms the number of terminals in which bandwidth shortage has occurred for all combinations of communication destinations and protocols, and distributes the updated standard bandwidth list to all communication terminals (steps). I8). Each received communication terminal stores the standard band list in the area for the standard band information storage unit 121 of the HDD.

  The present invention is applicable to bandwidth usage control in a bandwidth sharing network.

It is a block diagram which shows the structural example of the zone | band utilization control system by 1st Embodiment. It is a flowchart which shows an example of the communication start operation | movement in 1st Embodiment. It is a flowchart which shows an example of the upper limit band increase request | requirement operation | movement in 1st Embodiment. It is a flowchart which shows an example of the communication end operation | movement in 1st Embodiment. It is a flowchart which shows an example of the determination operation | movement of the allocation destination of the band which became available. It is a block diagram which shows the structural example of the zone | band utilization control system by 2nd Embodiment. It is a flowchart which shows an example of the communication start operation | movement in 2nd Embodiment. It is a flowchart which shows an example of the upper limit band addition request | requirement operation | movement in 2nd Embodiment. It is a flowchart which shows an example of the communication end operation | movement in 2nd Embodiment. It is a block diagram which shows the structural example of the zone | band utilization control system by 3rd Embodiment. It is a flowchart which shows an example of the upper limit band increase request | requirement operation | movement in 3rd Embodiment. It is a flowchart which shows an example of the communication end operation | movement in 3rd Embodiment. It is a flowchart which shows an example of the standard zone | band calculation operation | movement in the zone | band utilization control system by 3rd Embodiment. It is a block diagram which shows the structural example of the zone | band utilization control system by 4th Embodiment. It is a flowchart which shows an example of the upper limit band increase request | requirement operation | movement in 4th Embodiment. It is a flowchart which shows an example of the communication end operation | movement in 4th Embodiment. It is explanatory drawing which shows the structural example of the utilization band control system in a 1st Example. It is explanatory drawing which shows an example of the display screen of a band control content. It is explanatory drawing which shows the example of communication information memorize | stored in the communication information preservation | save part 222 when searching the reduction target. It is explanatory drawing which shows an example of the display screen of a band control content. It is explanatory drawing which shows an example of the display screen of a band control content. It is explanatory drawing which shows an example of the display screen of a band control content. It is explanatory drawing which shows an example of the display screen of a band control content. It is explanatory drawing which shows the example of the communication information of the communication completed in the past 3 days. It is explanatory drawing which shows the example of the object communication information in standard zone | band calculation operation | movement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication terminal 11 Data processing apparatus 111 Communication means 112 Band shortage determination means 113 Control content display means 114 Application means 115 Use band control means 116 Communication type analysis means 12 Storage device 121 Standard band information storage part 2 Bandwidth management server 21 Data processing apparatus 211 Communication Unit 212 Available Band Calculating Unit 213 Standard Band Calculating Unit 22 Storage Device 221 Standard Band Information Saving Unit 222 Communication Information Saving Unit 223 Shared Band Information Saving Unit 224 Upper Limit Increase Request Saving Unit

Claims (20)

In a communication system that performs communication by sharing a communication band with a plurality of communication terminals, a band use control system that controls use of a shared band that is a communication band shared by each communication terminal,
A plurality of communication terminals and a bandwidth management device that manages the bandwidth usage of the shared bandwidth,
The communication terminal is
Based on the upper limit bandwidth determined by the bandwidth management device, use bandwidth control means for performing bandwidth control of communication performed by the communication terminal,
An upper limit increase request means for requesting the band management device to increase the upper limit band of the communication when a shortage of the communication band is detected;
The bandwidth management device includes:
Increase from the standard bandwidth, which is a bandwidth that can be communicated without excess or deficiency, determined for each type of communication performed by the communication terminal based on the presence / absence of an increase request for the upper limit bandwidth of each communication and the content of shared bandwidth allocation Alternatively, it comprises an available bandwidth calculating means for determining an upper limit bandwidth indicating an upper limit of a communication bandwidth that can be used in each communication by determining a reduction amount ,
The available bandwidth calculating means reduces the upper limit bandwidth of the communication to the maximum standard bandwidth for communication in which a bandwidth larger than the standard bandwidth is allocated as the upper limit bandwidth when the shared bandwidth is insufficient, but the shared bandwidth is still sufficient If there is not, the communication bandwidth allocated to other communications is further reduced by reducing the upper limit bandwidth of at least one of the currently allocated communications or newly started communications to a bandwidth smaller than the standard bandwidth of the communications. Bandwidth usage control system characterized by securing. The available bandwidth calculation means is a case where the shared bandwidth is insufficient when communication is newly started, and there is no communication in which a bandwidth larger than the standard bandwidth is allocated as the upper limit bandwidth, The bandwidth according to claim 1 , wherein a communication bandwidth to be allocated to newly started communication is secured by reducing an upper limit bandwidth until all the communication including newly started communication becomes smaller than a standard bandwidth. Usage control system. Bandwidth management device
Communication information storage means for storing at least the upper limit bandwidth actually allocated as information indicating the type of each communication and the bandwidth control status;
The band use according to claim 1 or 2, further comprising: a standard band determining unit that determines a standard band for each type of communication based on information indicating a band control status stored in the communication information storage unit. Control system. The band use control system according to any one of claims 1 to 3, wherein a standard band is determined using a past communication history. Bandwidth management device
When an increase in the upper limit bandwidth is requested when the shared bandwidth is insufficient, an upper limit increase request storage means for temporarily storing the content is provided,
Available bandwidth calculating means, after eliminating the lack of shared bandwidth, in accordance with the contents stored in the upper limit increase request storing means, claim 1 to increase the upper limit band according to any one of claims 4 Bandwidth usage control system. Communication terminal
Triggered by an input operation from a user who is dissatisfied with the service quality of the service involving the communication executed on the communication terminal as a trigger, the communication can be indicated by the data amount and the upper limit bandwidth of the communication actually performed in the service by comparing the amount of data, bandwidth usage control system as claimed in any one of claims 5 with a bandwidth shortage detection means for detecting the insufficient bandwidth. Communication terminal
Using the notification from the application means that executes a service involving communication on the communication terminal as a trigger, comparing the data amount of communication actually performed in the service with the communicable data amount indicated by the upper limit band in bandwidth usage control system according to any one of claims 1 to 5 having a bandwidth shortage detection means for detecting the insufficient bandwidth. In a communication system in which a communication band is shared by a plurality of communication terminals, the band management apparatus is applied to a band use control system that controls the use of a shared band that is a communication band shared by each communication terminal. And
And the presence or absence of a request to increase the upper limit bandwidth of each communication sent if it detects a lack of communication band of a communication that the communication terminals perform the respective communications terminal, on the basis of the assignment content of shared bandwidth, the communication terminal performs Provided available bandwidth calculation means for determining the upper limit bandwidth of each communication by determining the amount of increase or reduction from the standard bandwidth, which is a bandwidth that can be communicated without excess or deficiency, determined for each type of communication ,
The available bandwidth calculating means reduces the upper limit bandwidth of the communication to the maximum standard bandwidth for communication in which a bandwidth larger than the standard bandwidth is allocated as the upper limit bandwidth when the shared bandwidth is insufficient, but the shared bandwidth is still sufficient If there is not, the communication bandwidth allocated to other communications is further reduced by reducing the upper limit bandwidth of at least one of the currently allocated communications or newly started communications to a bandwidth smaller than the standard bandwidth of the communications. A bandwidth management device characterized by securing . The available bandwidth calculation means is a case where the shared bandwidth is insufficient when communication is newly started, and there is no communication in which a bandwidth larger than the standard bandwidth is allocated as the upper limit bandwidth, For all communications including newly initiated communications, secure the communications bandwidth allocated to newly initiated communications by reducing the upper limit bandwidth until it becomes smaller than the standard bandwidth.
The bandwidth management apparatus according to claim 8. Communication information storage means for storing at least the upper limit bandwidth actually allocated as information indicating the type of each communication and the bandwidth control status;
Standard bandwidth determining means for determining a standard bandwidth for each type of communication based on information indicating the bandwidth control status stored in the communication information storage means
The bandwidth management apparatus according to claim 8 or 9. A communication terminal that is applied to a band use control system that controls use of a shared band that is a communication band shared by each communication terminal in a communication system that performs communication by sharing a communication band among a plurality of communication terminals. ,
Bands that can be communicated without excess or deficiency determined for each type of communication, notified from the bandwidth management device that manages the shared bandwidth , for bandwidth control of communications initiated by the communications terminal and communications performed by the communications terminal The upper limit band of the communication determined by determining the amount of increase or reduction from the standard band, and a band larger than the standard band is allocated as the upper limit band when the band management device is short of shared bands If the upper limit bandwidth of the communication is reduced to the standard bandwidth at the maximum for communication, and the shared bandwidth is still insufficient, the upper limit bandwidth of at least one communication among the currently allocated communication or the newly started communication is further increased. a bandwidth usage control means intends rows based on the upper limit band is a communication band ensured by reducing to a smaller bandwidth than the standard band of the communication,
A communication terminal comprising: an upper limit increase requesting unit that requests the band management device to increase an upper limit band of the communication when a shortage of a communication band is detected. A band usage control method for controlling the band usage of a shared band, which is a communication band shared by each communication terminal, applied to a communication system that performs communication by sharing a communication band between a plurality of communication terminals,
If the bandwidth management device that manages the bandwidth usage of the shared band detects from each communication terminal that there is a shortage of the communication bandwidth of the communication performed by the communication terminal , whether there is a request to increase the upper limit bandwidth of each communication, and the shared bandwidth The upper limit bandwidth of each communication is determined by determining the amount of increase or reduction from the standard bandwidth, which is a bandwidth that can be communicated without excess or deficiency, for each type of communication performed by the communication terminal based on the allocation content of In the determination process, when the shared bandwidth is insufficient, the upper limit bandwidth of the communication is reduced to the standard bandwidth at the maximum for the communication to which the bandwidth larger than the standard bandwidth is allocated as the upper limit bandwidth, and the shared bandwidth is still insufficient Further, by reducing the upper limit bandwidth of at least one communication among currently allocated communication or newly started communication to a bandwidth smaller than the standard bandwidth of the communication. Te, bandwidth usage control method characterized by securing a communication band to be allocated to another communication. When the bandwidth management device has a shortage of shared bandwidth when communication is newly started and there is no communication to which a bandwidth larger than the standard bandwidth is allocated as the upper limit bandwidth, The bandwidth usage control method according to claim 12, wherein the upper limit bandwidth is reduced so as to be smaller than the standard bandwidth for all communications including communications to be started. The bandwidth management device stores at least the upper limit bandwidth actually allocated as information indicating the bandwidth control status,
The bandwidth usage control method according to claim 12 or 13, wherein the bandwidth management device determines a standard bandwidth for each type of communication based on information indicating a stored bandwidth control status. When the bandwidth management device is requested to increase the upper limit bandwidth when the shared bandwidth is insufficient, the content is temporarily saved,
The bandwidth usage control method according to any one of claims 12 to 14 , wherein after the shortage of shared bandwidth is resolved, the upper limit bandwidth is increased in accordance with a request to increase the temporarily stored upper limit bandwidth. The communication terminal is triggered by an input operation from the user indicating dissatisfaction with the service quality of the service involving communication executed on the communication terminal, and is indicated by the data amount and the upper limit bandwidth of the communication actually performed in the service. The bandwidth usage control method according to any one of claims 12 to 15 , wherein a bandwidth shortage is detected by comparing the amount of data that can be communicated. The communication terminal is triggered by a notification from an application means that executes a service involving communication on the communication terminal, and the amount of data that can be communicated and the amount of communicable data that is indicated by the upper limit bandwidth are actually The band use control method according to any one of claims 12 to 15 , wherein a bandwidth shortage is detected by comparing the two. A bandwidth use control program applied to a bandwidth management device that controls the use of a shared band, which is a communication band shared by each communication terminal, in a communication system in which a plurality of communication terminals share a communication band. There,
On the computer,
And the presence or absence of a request to increase the upper limit bandwidth of each communication sent if it detects a lack of communication band of a communication that the communication terminals perform the respective communications terminal, on the basis of the assignment content of shared bandwidth, the communication terminal performs By determining the amount of increase or reduction from the standard bandwidth, which is the bandwidth that can be communicated without excess or deficiency, determined for each type of communication, execute the available bandwidth calculation process to determine the upper limit bandwidth of each communication ,
In the available bandwidth calculation processing, when the shared bandwidth is insufficient, the upper limit bandwidth of the communication is reduced to the standard bandwidth at the maximum for communication in which a bandwidth larger than the standard bandwidth is allocated as the upper limit bandwidth, but the shared bandwidth is still sufficient. If there is not, the communication bandwidth allocated to other communications is further reduced by reducing the upper limit bandwidth of at least one of the currently allocated communications or newly started communications to a bandwidth smaller than the standard bandwidth of the communications. Bandwidth usage control program for securing . On the computer,
In the available bandwidth calculation process, when a new communication is started, if there is a shortage of shared bandwidth, and there is no communication to which a bandwidth larger than the standard bandwidth is allocated as the upper limit bandwidth, The communication band allocated to newly started communication is ensured by reducing the upper limit band so as to be smaller than the standard band for all communications including newly started communication . Bandwidth usage control program. On the computer,
Processing for storing at least the upper limit bandwidth actually allocated as information indicating the bandwidth control status; and
Based on the stored information indicating the bandwidth control status, a process for determining a standard bandwidth for each type of communication is executed.
The bandwidth use control program according to claim 18 or 19.

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