JP2001177555A - Network bandwidth management method, network bandwidth management system, and network bandwidth management device - Google Patents

Abstract

(57) Abstract: The present invention relates to a band management method and the like in a network such as a LAN, which predicts a trend of a network user and adaptively controls the band management of the network based on the prediction result. The aim is to optimize. A network user uses a bandwidth reservation method in which a band required for communication is reserved for a network device on a communication path prior to the communication. When the location detection system detects a destination of a network user who has not yet made a predetermined communication using the network by dividing the band into an unusable band, and the network user performs the predetermined communication from the destination. When changing the ratio between the reservable band and the non-reservable band so that the necessary bandwidth is subtracted from the reservable band, when the network user makes a band reservation to perform the predetermined communication using a network, The ratio between the reservable band and the non-reservable band is restored.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band management method and system in a network such as a LAN. L
As a bandwidth management method in an AN, a technique for securing a required bandwidth by RSVP or the like has been established. Also, PHS
Techniques for grasping the distribution status of workers have been established by GPS and GPS. In the present invention, utilizing these technologies,
The determination of the required band is optimized based on the trend (for example, the moving position) of the worker (network user).

[0002]

2. Description of the Related Art In recent years, in a network such as a LAN, a technique has been established which controls connection priority and secures a band required for data transmission in accordance with an application for performing various communications and a traffic type. Have been. Among them, the technology to secure the transmission band is RS
VP (Resource Reservation Protocol) is becoming popular.

[0003] This RSVP exists on the communication path of a data receiving terminal that has received a control message from the data transmitting terminal by returning a reservation message specifying a band to the data transmitting terminal. A router internally reserves a transmission band between routers. According to this technology, in an application such as a video that needs to ensure a wide band, it is possible to perform communication after reserving and securing a necessary band prior to communication.

[0004]

As described in the prior art, when it is necessary to secure a wide band such as a video image and perform communication, a method of reserving a band by RSVP is generally used. However, in the RSVP scheme, by accepting a reservation without setting the reservable band to 100% of the entire band, the band can be secured even for a sudden communication.

[0005] That is, as shown in FIG. 9, the entire band that can be communicated by the network device is divided into a reservable band that can be reserved by RSVP and a non-reservable band (surplus band) that is a margin for future communication. , The reservation is permitted only for the reservable band. However, in this method, if it is not known how many bands will be required in the future, it is difficult to determine what percentage of the band should be the reservable band. If the bandwidth is too large, a wasteful bandwidth is generated and the efficiency is inefficient. On the other hand, if the margin bandwidth is small, a necessary bandwidth cannot be secured in a case where short-term broadband communication is suddenly required. Such a situation may occur.

[0006] From this, if band use that can occur in the short term can be expected, more efficient band management becomes possible. Factors that increase the required bandwidth in the short term as described above include applications that require a wide bandwidth such as video. If the schedule and the like, such as the date and time when these applications are used, are determined in advance, for example, as shown in FIG. 10, a band management method such as changing the ratio between the reservable band and the spare band according to the schedule can be considered. . This method can be said to be an effective measure for efficient band management when the required band can be predicted according to the schedule.

[0007] One of the factors that necessitate broadband communication in the short term is that the mobile operator carries a personal computer and uses it at the destination location to join the network in a short term. There are significant fluctuations.

For example, an administrator of a power generation / transformation facility or a factory plant patrols the facility with a portable personal computer to perform inspections and the like, takes a picture of the patrol site with a video camera, and uses the personal computer. There is an operation of a form in which data is distributed in real time to a management center or the like through a LAN. In this mode of operation, a personal computer is LA
Since the traffic from the patrol location sharply increases by connecting to N and transmitting the video, a situation may occur where RSVP reservation cannot be made accurately, and the bandwidth management cannot be optimized. As a countermeasure for such a problem, it is necessary to have a mechanism for grasping the trend of such a mobile user and reflecting the trend in the RSVP margin value.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to optimize a network user by predicting a trend of the network user and adaptively controlling network bandwidth management based on the prediction result. And

[0010]

FIG. 1 is a diagram illustrating the principle of the present invention. In order to solve the above-described problem, the present invention uses a band reservation method in which a network user reserves a band necessary for the communication with a network device on the communication path prior to the communication. The band of the network device of this network is divided into a reservable band and a non-reservable band. Then, a movement of the network user who has not yet performed the predetermined communication using the network, for example, the movement destination is detected by the position detection system, and the network user performs the predetermined communication from the movement destination. At this time, the ratio between the reservable band and the non-reservable band is changed so that the necessary band is subtracted from the reservable band. Further, when the network user makes a band reservation to perform the predetermined communication using the network, the ratio between the reservable band and the non-reservable band is restored. As a result, the network user can always reserve the bandwidth at least for the increase due to the restoration of the ratio in the reservable bandwidth.

[0011] When the location detection system detects that the network user has moved, if the network user has not made a bandwidth reservation at the source,
It is preferable that the ratio between the reservable band and the non-reservable band of the network device on the communication path at the time of communication from the source is restored.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a network (LA) that performs a network bandwidth management method according to an embodiment of the present invention.
N: local area network). As shown, a plurality of areas (in this embodiment, areas # 1 to # 1)
# 3) is connected via the network devices 10, 20, 30 to form a LAN. Among them, a management center is set in area # 3. These areas #
For example, each floor in one building is associated with 1 to # 3.

In the area # 3 where the management center is installed,
A network device 30, a personal computer 31, a server 32, a receiving device 33, a band management server 34, a position detection system parent device 35, and the like are installed. In the area # 1, the network device 10, the personal computers 11, 12, the receiving device 13
Similarly, a network device 20, personal computers 21, 22 and a receiving device 23 are installed in the area # 2. And between the network devices 10 and 30,
By connecting the network devices 20 and 30 by communication lines, each area is connected in a LAN form.
The receiving devices 13, 23, and 33 in each area are connected to a position detection system master device 35 on the management center side.

Here, the receiving devices 13, 23,
Reference numeral 33 is provided as a destination of the position detection system, determines presence / absence of a worker in the area based on wireless information from the transmitter 1 carried by a worker in each area, and determines the worker information (specifically, (ID information) to the parent device 35 of the position detection system. As the transmitter 1, a technology such as PHS can be used.

The parent device 35 of the position detection system checks the presence or absence of a worker in each area based on the worker information from each of the receiving devices 13, 23 and 33, edits it as area unit existence information, and The presence information is notified to the bandwidth management server 34.

The bandwidth management server 34 instructs each of the network devices 10, 20, and 30 by RSVP on the bandwidth to be reserved and used between the network devices. As reference information for performing the control, area unit presence information indicating worker presence / absence information for each of the areas # 1 to # 3 is received from the position detection system parent device 35.

The network devices 10, 20, and 30 are connected to personal computers and servers under the network devices, and connect the personal computers between areas.
Devices that support SVP and perform bandwidth management on the basis of bandwidth reservation notifications from the bandwidth management server 34, such as a router.

FIG. 3 shows a detailed configuration of the position detection system. This position detection system includes a transmitter 1 carried by a mobile worker, receiving devices 13, 23, and 33 installed in areas # 1 to # 3, a parent device 35 installed in area # 3 on the management center side, and the like. It consists of.

The transmitter 1 includes an ID number management unit 101 for managing an ID number uniquely assigned to the transmitter 1, an ID number transmission unit 102 for transmitting the ID number wirelessly to a receiving device, and the like. It is comprised including.

The receiving device 13 in the area # 1 receives the ID number from the transmitter 1 and detects the ID unavailable state when the ID number receiving unit 131 cannot receive the ID number. ID number information transmission unit 1 that transmits ID number information or the information about reception of the ID number to the parent device 35 of the position detection system.
33 and the like. Receiving device 2 in other area
3 and 33 have the same configuration.

The position detection system parent device 35 includes an ID number receiving unit 351 for receiving ID number information from the receiving devices 13, 23, and 33 in each of the areas # 1 to # 3, and an area unit for each area based on the received ID number information. , An area unit ID number information management unit 352 that manages the ID number information, and an area unit existence information generation unit 353 that generates area unit existence information indicating presence or absence of a worker in area units based on the area unit ID number information management information. And a band management server transmission unit 354 for transmitting the area unit existence information to the band management server 34. Here, the area unit existence information generated by the area unit existence information generation unit 353 is:
It is composed of an area number, a corresponding worker ID number, information on the presence / absence (existence / absence) of the worker, and the like.

FIG. 4 shows a detailed configuration of the band management server 34 and the like. The band management server 34 includes a receiving unit 341 for the position detection system that receives the area unit presence information from the position detection system parent device 35, an area unit presence information analysis unit 342 that analyzes the received area unit presence information,
An area-based network device management unit 343 that manages what network devices are installed in each area in units of an area, an RSVP non-reservable band control unit 344 that controls a non-reservable band (margin band) by RSVP, and a network device. A communication unit 345 for a network device that performs communication of the mobile device, a worker network use detection unit 346 that detects that a mobile worker is using a network based on transmission information from the network device, and the like.

Among them, the RSVP unreservable band control unit 3
Reference numeral 44 includes an RSVP unreservable band management unit, an RSVP non-reservable band determination unit, a network device band information notification unit, and the like. This RSVP non-reservable band management unit includes:
It recognizes and manages how much the current non-reservable band of each area is set, that is, how much the ratio between the reservable band and the non-reservable band is set. The RSVP non-reservable band determining unit determines the RSVP non-reservable band of the target area based on the area unit existence information received from the position detection system parent device 35 and the non-reservable band of each area managed by the RSVP non-reservable band management unit. I do. The network device band information notifying unit notifies the network device in the target area of the value of the RSVP non-reservable band determined by the RSVP non-reservable band determining unit.

The network device has an RSVP controller. The RSVP controller instructs the band management server 34 to make an RSVP band reservation in response to a request for RSVP band reservation from the RSVP reservation unit of the personal computer carried by the worker. A request is made, and control is performed to set the ratio between the reservable band and the non-reservable band based on the value of the RSVP non-reservable band determined as a result. Further, the network device transmits the network use notification information (such as a video distribution start request) from the network use notification unit of the personal computer carried by the worker to the worker network use detection unit 3 of the bandwidth management server 34.
Relay to 46.

The operation of the system of this embodiment will be described below with reference to the operation sequence diagram shown in FIG. 5 and the operation flowcharts shown in FIGS. Here, the operation sequence diagram of FIG. 5 shows an operation in a case where a mobile worker enters area # 1 from outside the area, and transmits image information from the portable personal computer to area # 3 where the management center is located in area # 1. 5 shows a sequence, in which information is exchanged among a worker, a position detection system, a band management server, and a network device. 6 and 7 are flowcharts showing detailed operation procedures of the operation sequence S1 shown in the operation sequence diagram of FIG. 5, and FIG. 8 is a flowchart showing detailed operation procedures of the operation sequence S2.

First, the overall operation flow will be described with reference to the operation sequence diagram of FIG. (1) When the worker enters the area # 1, an ID number is transmitted from the transmitter 1 carried by the worker, and the receiving device 13 of the position detection system in the area # 1 receives the ID number.
Receive the D number.

(2) The receiving device 13 sends the received ID number information to the parent device 35 of the position detection system at the management center installed in area # 3.

(3) Position detection system When the parent device 35 knows from the information from the receiving device 13 that an operator has entered the area # 1, it edits the fact as area unit existence information for the area # 1. The bandwidth management server 34 is notified.

(4) The bandwidth management server 34 refers to the area unit existence information on the area # 1 received from the position detection system parent device 35, and the operator uses the bandwidth from the area # 1 for video distribution or the like. Judging that there is a possibility,
As advance preparation, for the network devices 10 and 30 on the transmission path of the video information, a value obtained by expanding the non-reservable band (margin band) set for them by the band necessary for the video distribution ( In other words, a non-reservable band change notification is issued to instruct to change the reservable band to a value reduced by the band necessary for the video distribution). The network device 10 that has received the reservation-unavailable band change notification,
Reference numerals 30 correspond to subsequent reservations in RSVP by expanding the non-reservable band by the amount of notification.

(5) When a worker working in area # 1 starts video distribution from a personal computer using a network, the personal computer notifies the band management server 34 of a video distribution start request via the network. I do.

(6) Upon receiving the video distribution start notification from the operator's personal computer, the bandwidth management server 34 reduces the non-reservable bandwidth to the network devices 10 and 30 by the bandwidth required for the video distribution. By notifying the non-reservable band change notification instructing this, the network devices 10 and 30 change the band so as to reduce the non-reservable band by the amount of the notification, so that at least the reduced amount of the changed non-reservable band ( In other words, with respect to the increase in the reservable bandwidth), the bandwidth for video distribution from the worker in the area # 1 can be always secured by RSVP reservation.

(7) When a worker working in area # 1 distributes a video from a personal computer, a band is reserved for the network device 10 and the network device 30 on the route by RSVP, and the video is transmitted using the network. Start distribution.

(8) When the worker leaves the area # 1, the receiving device 13 in the area # 1 transmits the ID from the transmitter 1 of the worker.
Since the number cannot be received, the receiving device 13 notifies the position detection system parent device 35 of that fact.

(9) When the receiving device 13 notifies that the worker has left the area # 1, the position detecting system parent device 35 notifies the fact as area unit ID information on the area # 1. The information is edited by the information management unit 352 and notified to the bandwidth management server 34.

(10) The band management server 34 receives the area unit existence information, and recognizes that no worker has left the area # 1. At this time, if the worker who has left the area does not actually perform the video distribution in the area # 1, the non-reservable bandwidth of the network devices 10 and 30 is increased by the bandwidth required for the video distribution. Therefore, the network device 1 sends a non-reservable band change notification instructing to reduce the non-reservable band by the increased amount.
Perform for 0 and 30.

Next, the processing procedure performed by the bandwidth management server 34 will be described with reference to the flowcharts shown in FIGS. First, the operation procedure of the operation sequence S1 in the operation sequence diagram of FIG. 5 will be described with reference to the flowcharts shown in FIGS.

An operator enters a new area and the receiving device 1
When the device 3 receives the ID number and sends the ID number information to the position detection system parent device 35, the position detection system parent device 35 edits the area unit existence information and transmits it to the band management server 34. This flow is started upon receiving this notification from the position detection system parent device 35 (step S11).

When the band management server 34 receives the area unit presence information from the position detection system parent device 35 (step S12), the received area unit presence information indicates that a worker is present in a certain area. It is determined whether the information is information, that is, whether there is an area where a worker has newly entered (step S13).

If there is an area in which the worker has newly entered, the network device (for example, the worker is located in an area # of the management center) in connection with the area in which the worker has entered when the worker performs video distribution. 3 is a video distribution destination, a network device on the video distribution route in a case where it is determined in advance, and a non-reservable band change notification (a non-reservable band Change notification instructing to increase by the bandwidth required for video distribution)
Is obtained from the RSVP unreservable band control unit 344 in the band management server 34 (step S14), and the obtained reservation non-reservable band change notification is sent to the RSVP non-reservable band control unit 344.
(Step S1).
5).

It should be noted that, in the determination in step S13,
If there is no worker who has entered the new area, the processes in steps S14 and S15 are not performed by jumping.

Then, based on the area unit existence information obtained from the position detection system parent device 35, it is determined whether there is an area from which the worker has left (step S16). In this case, when the worker leaves the area, the receiving device detects that the ID number cannot be received and notifies the position detection system parent device 35. Based on this information, the position detection system parent device 35 determines that the worker is absent. The area unit presence information indicating the presence is edited and sent to the bandwidth management server 34. The bandwidth management server 34 determines that the worker has left the area based on the information on the absence of the worker in the area unit presence information (step S16).

If there is an area from which the worker has left, it is determined whether or not the leaving worker has already delivered video in the area (ie, whether or not the processing procedure of FIG. 8 described later has been performed) (step S17). Otherwise, when the worker enters the area, the unreservable band is changed so as to increase the unreservable band of the related network device and remains as it is. Perform return processing.

That is, regarding the area from which the worker has left, the network devices related to the video distribution by the worker and the notification of the change of the non-reservable band to those network devices (the non-reservable band is changed to the bandwidth required for the video distribution). Change notification indicating that the bandwidth is reduced only by the RSVP reservation control unit 34 in the bandwidth management server 34.
4 (step S18), and the obtained unreservable band change notification is notified from the network device band information notification unit of the RSVP unreservable band control unit 344 to the related network device (step S19).

Incidentally, in the above-mentioned determination in step S16,
If there is no worker who has newly left the area, the processing in steps S17 to S19 is not performed by jumping.

On the other hand, a process in the case where a worker present in a certain area starts video distribution from the area to the management center (area # 3) will be described below with reference to the flowchart of FIG. I do.

When an operator attempts to send an image to the management center using the personal computer carried by the operator, first, the portable computer transmits an image distribution start request to the bandwidth management server 34. Upon receiving this video distribution start request (step S22), the bandwidth management server 34 determines, for the area where the worker is currently located, the network devices related to the video distribution by the worker, and the non-reservable bandwidth for those network devices. A change notification (a change notification instructing to reduce the unreservable band by the amount required for video distribution) is obtained from the RSVP non-reservable band control unit 344 in the band management server 34 (step S23), and the obtained change notification is obtained. The notification of the unreservable band change is sent from the network device band information notification unit of the RSVP unreservable band control unit 433.
Notification is made to the related network device (step S24).

In carrying out the present invention, various modifications are possible. For example, in the above-described embodiment, the destination to which the worker distributes the video information from the moving destination is the area where the management center is located. However, the present invention is not limited to this. 1 to area # 3
May be distributed to the area # 2 via the Internet. The information to be transmitted is not limited to video information, and the present invention can be applied to various types of media information for which it is effective to reserve a band. Also, the form of the network is not limited to the star type centered on the area of the management center as shown in the embodiment, and the present invention can be applied to any form of network.

[0048]

As described above, according to the present invention,
It is possible to optimize by detecting the movement of the network user, for example, its destination, and adaptively controlling the bandwidth management of the network based on the detection result.

For example, for an operation in which a worker moves and flows broadband traffic such as video using an installed LAN, the possibility of such communication is predicted by information from a position detection system, and RSVP is performed. By determining the margin value, it is possible for an operator to secure a margin immediately before distributing broadband traffic such as video, and effective bandwidth management becomes possible.

[Brief description of the drawings]

FIG. 1 is an explanatory view of the principle according to the present invention.

FIG. 2 is a diagram illustrating an overall configuration of a network that performs a network bandwidth management method as one embodiment according to the present invention;

FIG. 3 is a diagram illustrating a detailed configuration of a position detection system in the embodiment system.

FIG. 4 is a diagram illustrating a detailed configuration of a bandwidth management server and the like in the system according to the embodiment.

FIG. 5 is a diagram showing an operation sequence of the embodiment system.

6 is an operation sequence S in the operation sequence diagram of FIG.
3 is a flowchart (1/2) showing a detailed procedure of No. 1;

7 is an operation sequence S in the operation sequence diagram of FIG.
4 is a flowchart (2/2) showing a detailed procedure of No. 1;

8 is an operation sequence S in the operation sequence diagram of FIG.
9 is a flowchart showing a detailed procedure of Step 2.

FIG. 9 is a diagram illustrating a reservable band and a non-reservable band (margin band) in the system of the embodiment.

FIG. 10 is a diagram illustrating an example in which a bandwidth is reserved based on a conventional application operation schedule.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmitter 11, 12, 21, 22, 31, 32 Personal computer 10, 20, 30 Network equipment 33 Position detection system parent apparatus 13, 23, 33 Position detection system receiving apparatus 35 Band management server # 1-# 3 area

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 5K030 GA08 HC09 HC14 HD03 JA10 JT09 LC09 LE16 LE17 MA01 MB00 5K033 AA04 BA02 BA04 CB06 DA05 DA15 DA19

Claims (12)

[Claims] 1. A network bandwidth management method using a bandwidth reservation method in which a network user reserves a bandwidth required for communication prior to communication with a network device on the communication path. Is divided into a reservable band and a non-reservable band, and the trend of network users who have not yet performed predetermined communication using the network is detected, and based on the detection result, the possibility that the network user will use the network When it is determined that the network user has become higher, the network user changes the ratio between the reservable band and the non-reservable band so that the necessary bandwidth for the predetermined communication is reduced from the reservable band. When making a bandwidth reservation for performing the predetermined communication using the network, the Network bandwidth management method to return to the original ratio of a band. 2. When it is determined based on the detection result that the network user has a low possibility of using the network, if the network user has not made a band reservation, the reservable band and the reservation unreservable cannot be used. 2. The network bandwidth management method according to claim 1, wherein the ratio with the bandwidth is restored. 3. A network bandwidth management method using a bandwidth reservation method in which a network user reserves a bandwidth required for communication with a network device on a communication path prior to communication. Is divided into a reservable band and a non-reservable band.The destination of a network user who has not yet performed predetermined communication using the network is detected by the position detection system, and from the destination, the relevant network user In order for the network user to perform the predetermined communication by using the network, the ratio of the reservable band and the non-reservable band is changed so that the necessary bandwidth for the predetermined communication is subtracted from the reservable band. A network bandwidth management method for restoring the ratio between the reservable bandwidth and the non-reservable bandwidth when performing bandwidth reservation. 4. The communication for communication from the source when the location detection system detects that the network user has moved, unless the network user has made a bandwidth reservation at the source. 4. The network bandwidth management method according to claim 3, wherein the ratio between the reservable bandwidth and the unreservable bandwidth of the network device on the route is restored. 5. A network band management system using a band reservation system in which a network user reserves a band necessary for the communication with a network device on the communication path prior to the communication. Detection means for detecting a trend of a network user who has not yet performed predetermined communication using the network, and a network user based on a detection result of the trend detection means. When it is determined that the possibility of using the network has increased, the ratio between the reservable band and the non-reservable band is set so that the network user can reduce the necessary bandwidth for the predetermined communication from the reservable band. First band changing means for changing, and the network user performs the predetermined communication using a network. A network bandwidth management system comprising: a second bandwidth changing unit that restores the ratio between the reservable bandwidth and the non-reservable bandwidth when making a bandwidth reservation. 6. When it is determined based on the detection result that the network user has a low possibility of using the network, if the network user has not made a band reservation, the reservable band and the reservation unreservable cannot be used. 6. The apparatus according to claim 5, further comprising third band changing means for restoring the ratio with the band.
A network bandwidth management system as described. 7. A network bandwidth management system that uses a bandwidth reservation method in which a network user reserves a bandwidth required for the communication with a network device on the communication path prior to the communication. Position detecting means for detecting a movement position of a network user who has not yet made a predetermined communication using the network, and a moving destination detected by the position detecting means. First band changing means for changing a ratio between a reservable band and a non-reservable band such that a band required when the network user performs the predetermined communication is reduced from the reservable band; When making a band reservation for performing the predetermined communication using the above, the ratio between the reservable band and the non-reservable band A network bandwidth management system comprising: a second bandwidth change unit that restores the original bandwidth. 8. When the position detecting means detects that the network user has moved, if the network user has not made a bandwidth reservation at the source, communication at the time of communication from the source is performed. 8. The network bandwidth management system according to claim 7, further comprising third bandwidth changing means for restoring the ratio between the reservable bandwidth and the unreservable bandwidth of the network device on the route. 9. A network bandwidth management device in a network using a bandwidth reservation method in which a network user reserves a bandwidth required for the communication with a network device on a communication path prior to the communication, the network device comprising: Receiving means for receiving a detection result from a trend detecting means for detecting a trend of a network user who has not yet performed predetermined communication using the network, and divides the bandwidth into a reservable bandwidth and a non-reservable bandwidth. When it is determined that the network user is more likely to use the network based on the detection result of the trend detection means received in step 2, the bandwidth required for the network user to perform the predetermined communication can be reserved. A change notification instructing to change the ratio between the reservable band and the unreservable band so that the First notification means for transmitting to a network device on a communication path; and when the network user reserves a band for performing the predetermined communication using the network, the first and second reservable bands and the non-reservable band are used. A second notification unit for transmitting a change notification for instructing to restore the ratio to the network device on the communication path. 10. When it is determined based on the detection result that the network user has a low possibility of using the network, if the network user has not made a bandwidth reservation, the reservable bandwidth and the reservation unavailable 10. The network bandwidth management device according to claim 9, further comprising third notification means for transmitting a change notification instructing to restore the ratio to the bandwidth to the network device on the communication path. 11. A network bandwidth management apparatus in a network using a bandwidth reservation method in which a network user reserves a bandwidth required for the communication with a network device on a communication path prior to the communication, the network device comprising: Receiving means for receiving a position detection result from a position detecting means for detecting a moving position of a network user who has not yet performed predetermined communication using a network, by dividing the band into a reservable band and a non-reservable band. The ratio between the reservable band and the non-reservable band such that the required bandwidth for the network user to perform the predetermined communication from the destination detected from the position detection result received by the receiving means is reduced from the reservable band. Notification means for transmitting a change notification instructing to change the network device to the network device on the communication path; When a network user reserves a band for performing the predetermined communication using the network, a change notification instructing to restore the ratio between the reservable band and the non-reservable band is returned to the network on the communication path. A network bandwidth management device comprising a second notification unit for transmitting to a device and a second bandwidth change unit. 12. When the movement of the network user is detected based on the position detection result received from the position detection means, if the network user has not made a bandwidth reservation at the movement source, the movement A third notification unit for transmitting a change notification for instructing to restore the ratio of the reservable band to the non-reservable band of the network device on the communication path when communicating from the network device to the network device on the communication path. The network bandwidth management device according to claim 11, comprising: