JP2004032680A - Monitor system and network system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively use the band of communication path, in a monitor system. <P>SOLUTION: A console processor 20 assigns a fixed band to each of image data communication of even occurrence rate between a camera node 40 and a monitor node 18. It assigns a constant band to the whole communication about alarm information with uneven occurrence rate between sensor nodes 50 and the console processor 20. If the traffic in a network 10 increases, it reassigns a band, to the communication between the camera node 40 and the monitor node 18 so that it becomes less. The camera node 40 transmits image data using the assigned band. The sensor nodes 50 transmit alarm information that has occurred using an arbitrary band. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to communication system monitoring for communicating between a plurality of devices via a network, and more particularly to a monitoring system for collecting information from sensors and monitoring cameras via a network.
[0002]
[Prior art]
For example, as one form of a communication system, a surveillance system that collects information from a plurality of surveillance cameras and sensors arranged at remote locations via a network on a console processing device and a plurality of monitors of a surveillance center has been put into practical use. I have. In such a surveillance system, communication is performed via a network between each monitoring camera and each monitor or between a plurality of sensors and a console processing unit, so that the monitoring camera and the console can be connected from the monitoring cameras and sensors. By sending information to the processing device, collection of such information is realized.
[0003]
Here, there is known a band limitation technique for allocating a band (capacity) that can be used for each communication in advance so that each communication can be performed without being affected by other communication. For example, in the technology described in Japanese Patent Application Laid-Open No. H10-42280, a band is divided for each type of information communicated in the monitoring system, an available bandwidth is allocated in advance to each division, and during operation of the monitoring system, Each monitoring camera and each sensor transmits information to the monitor or the console processing device within the band allocated to the section to which the information to be transmitted belongs.
[0004]
In addition to this, as a band limiting technique for a communication system, there is a technique described in JP-A-6-284148. In this technology, in one-to-one audio-video communication, a device performing communication performs only audio communication when the communication throughput increases, and performs audio and video communication when the communication throughput decreases.
[0005]
[Problems to be solved by the invention]
According to the technique of fixedly allocating a band for each type of information as in the technique described in JP-A-10-42280, abnormality information from a sensor or a response command issued from a console processing device operated by a user. For information with an occurrence rate that is not uniform over time, such as control data, if a band is assigned to the information section in accordance with the maximum occurrence rate of the information, there are many times when the assigned band is not used effectively. Will happen.
[0006]
On the other hand, if a band is allocated to a section of information whose generation rate is not uniform over time according to the average generation rate of information, when information is generated beyond this, communication of such information can be performed quickly. become unable. This is not preferable because it causes a delay in collection of urgent important information such as the abnormal information and the coping command.
[0007]
Further, if it is assumed that communication is performed in a band corresponding to the generation rate of each information without allocating a band in advance for each information division, for example, when a certain amount of information occurs at a time, each information This communication may be subject to unpredictable effects of other communications, causing communication failures. Due to such a failure, various information such as the abnormality information and control data such as a coping command may be lost.
[0008]
In such a case, if the audiovisual communication technology described in Japanese Patent Laid-Open No. 6-284148 is applied, the collection of important information requiring urgency such as the abnormal information and the coping command is also delayed. Will be.
[0009]
Accordingly, the present invention provides a monitoring system in which communication of information whose generation rate is uniform in time and communication of information whose generation rate is not uniform in time coexist, delays communication of important information that needs some urgency. It is an object to use the band more effectively without giving the bandwidth.
[0010]
Another object of the present invention is to prevent a delay or loss of communication of important information communicated on a network such as a monitoring system.
[0011]
[Means for Solving the Problems]
In order to achieve the object, the present invention provides, for example, an input node that captures the state of a monitoring target, an output node that outputs information indicating the state of the monitoring target, and a control node that controls the input node and the output node. A monitoring system that transfers data over a network between
Prior to the start of the transfer of the first type of data, which is the data to be transferred uniformly in time, the control node determines the total transmission capacity used for the transfer of the first type of data as the total of the network. A transmission capacity used for the transfer of the first type of data to be started is allocated so as to be equal to or less than a predetermined amount smaller than the transmission capacity, and the second type of data to be transferred non-uniformly in time is allocated. For transfer, do not allocate the transmission capacity used in the transfer,
An input node, an output node, or a control node that transfers the first type of data transfers data at a transfer rate according to a transmission capacity allocated to the transfer;
An input node, an output node, or a control node that transfers the second type of data transfers data at a transfer rate according to the available transmission capacity of the network.
[0012]
According to such a transfer system, a band is not allocated in advance for data transfer in which data to be transferred non-uniformly occurs. On the other hand, for data transfer in which data to be transferred uniformly over time occurs, the bandwidth is set so that the total transmission capacity used for the data transfer is equal to or less than a predetermined amount smaller than the total transmission capacity of the network. , A transmission capacity that can be used for data transfer in which data to be transferred non-uniformly occurs is always secured.
[0013]
Here, the transmission capacity to be secured in this way is statistically statistically small, since the probability that the rate of occurrence of each of the data that occurs non-uniformly at the same time is the maximum is small, It may be smaller than the sum of the rates. For example, if the transmission capacity is secured by the maximum value of the total sum of the data generation rates that occur statistically unevenly in time, there will be a delay in the transfer of data unevenly occurring in time. Is almost gone. However, the transmission capacity to be secured may be less than or equal to the maximum value of the total data generation rate, or may be less than the maximum value of the total data generation rate, depending on various circumstances such as the amount of delay and transmission capacity allowance that can be tolerated by the monitoring system. It may be greater than or equal to the maximum value.
[0014]
Therefore, according to this monitoring system, the bandwidth of the maximum data generation rate is allocated to each data transfer without delaying the communication of important information that requires some urgency. Can be used effectively.
[0015]
Further, in order to achieve the above object, the present invention provides, for example, a method of transferring data via a network between an input node that captures the state of a monitoring target and a node that outputs information indicating the state of the monitoring target. Monitoring system that performs
When the traffic of the network increases by a predetermined level or more, the transfer of the first type of data is performed so that the transfer rate of the transfer of the first type of data performed through the network is reduced. Having control means for controlling an input node or an output node,
The input node or the output node that is transferring the first type of data reduces the transfer rate of the transfer according to the control of the control unit, so that the second type differs from the first type. Maintain or increase the transfer rate of the data transfer.
[0016]
According to such a monitoring system, when the traffic of the network increases by a predetermined level or more, the transfer rate of the transfer of the first type of data performed through the network is reduced, and the second rate is reduced. The transfer rate of the transfer of the type of data is maintained or increased, thereby preventing the transfer or delay of the transfer of the second type of data from occurring.
[0017]
According to another aspect of the present invention, there is provided a network system comprising: a communication node that performs communication classified into any one of a plurality of communication types via a network; and a control node connected to the network. ,
The control node comprises:
Storage means for storing, for each communication type, a condition table describing conditions to be satisfied by a band used by a network used for communication of the communication type;
Detecting means for detecting the used band of the network used by each communication for each communication type,
When the detected use band for each communication type does not satisfy the condition described in the condition table, the communication node changes the network to change the band used for communication so that the condition is satisfied. And control means for performing control via the
[0018]
According to such a network system, the condition for each communication type described in the condition table stored in the storage means is a condition to be satisfied in relation to a band used by a network used for communication of another communication type. Can be included, and by appropriately describing this condition, the used band of the second communication type is changed from the band of the network that can be used for the communication of the first communication type and the second communication type. If the value exceeds the value obtained by subtracting the bandwidth assigned to the first communication type described in the bandwidth information table, the bandwidth used for the communication of the first communication type may be reduced, or the second communication type may be reduced. When it is detected that this communication is occurring, the communication of the first communication type can be stopped.
[0019]
Therefore, by setting the type of communication of important information to be communicated as the second communication type, it is possible to prevent the important information from being delayed or lost.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of a communication system according to the present invention will be described by taking an example of application to a monitoring system.
[0021]
FIG. 1 shows a configuration of a monitoring system according to the present embodiment.
[0022]
This monitoring system is applied to night monitoring in buildings for crime prevention, daytime department store monitoring for complete confirmation, and facility monitoring in factories.
[0023]
As shown, in the present monitoring system, the camera 40 is connected to the network 10 via the camera node 30, the sensor 60 is connected via the sensor node 50, and the monitor 16 is connected via the monitor node 18, respectively. The console processing device 20 operated by the user is also connected to the network 10. The console processing device 20 is configured by a personal computer, a workstation, or the like, and is equipped with a display 14, a mouse 24 as an input device, and a keyboard 22. The user 12 operates the monitoring system using the console processing device 20. Note that a plurality of console processing devices 20 may be provided.
[0024]
In such a configuration, an image from the camera 40 is displayed on the monitor 16 via the network 10 based on an instruction from the console processing device 20. When the sensor 60 detects an abnormality such as a fire or intrusion, the alarm information is displayed on the plurality of monitors 16 via the network 10.
[0025]
Next, FIG. 2 shows a hardware configuration of the console processing device 20.
[0026]
As shown in the figure, the console processing device 20 includes a network connection controller 112, a CPU 102, a memory 104, an input / output controller 106 for controlling a keyboard 22 and a mouse 24, and a monitor controller 108 connected by a bus 110. It has a configuration.
[0027]
Next, FIG. 3 shows a hardware configuration of the monitor node 18.
[0028]
As illustrated, the monitor node 18 has a hardware configuration in which a monitor controller 120 that controls the monitor 16 that displays an image, a CPU 122, a memory 124, and a network connection controller 126 are connected to a bus 128. ing.
[0029]
Next, FIG. 4 shows a hardware configuration of the camera node 30.
[0030]
As illustrated, the camera node 30 has a hardware configuration in which a camera controller 136 for controlling the video camera 40i, a CPU 132, a memory 134, and a network connection controller 130 are connected by a bus 305.
[0031]
Next, FIG. 5 shows a hardware configuration of the sensor node 50.
[0032]
As shown in the figure, the sensor node 50 is connected to a sensor group 60i, and is connected by a bus 148 to a sensor controller 146, a CPU 142, a memory 144, which reads a sensor setting and an abnormality detection signal from the sensor, and a network connection controller 140. Hardware configuration.
[0033]
Next, FIG. 6 shows a software configuration of the console processing device 20.
[0034]
This software configuration is realized on the console processor 20 by the CPU 102 executing a program stored in the memory 104, and performs each function described later on the console processor 20.
[0035]
As illustrated, the software configuration of the console processing device 20 includes a network control driver 174, a communication management module 172, an input / output device control driver 150, a GUI control module 152, a transfer service module 156, a bandwidth management manager module 160, a transmission rate It has a management module 164, a band information table 154, a reception control module 158, transmission queues 166 and 168, and a reception queue 170.
[0036]
The network control driver 174 controls the network connection controller 112. The communication management module 172 implements, via the network control driver 174, one-to-one communication for transferring a message to a designated device and broadcast communication for transferring a message to all devices connected to a network.
[0037]
The input / output control driver 150 controls the monitor 14, the keyboard 22, and the mouse 24.
[0038]
The transfer service module 156 specifies the type of transfer service to be used for each node via the communication management module 172. Here, the transfer service types include “bandwidth reservation transfer service”, “statistical multiplex transfer service”, and “emergency transfer service”.
[0039]
The band management manager module 160 reserves and releases a band according to the transfer service type of each communication. Further, when a communication delay occurs in the network, the band management module 160 performs communication restriction for eliminating the delay and releases the communication restriction. These are realized by issuing a command to another node via the communication management module 172.
[0040]
The communication queues 166 and 168 are provided corresponding to different transmission rates.
[0041]
The communication management module 172 transmits the transmission data stored in each of the transmission queues 166 and 168 at a corresponding transmission rate.
[0042]
The transmission rate monitoring module 164 switches the transmission queues 166 and 168 storing the transmission data according to the type of transfer service used for communication of the transmission data.
[0043]
The reception control module 158 processes the reception data received by the communication management module 172 via the reception queue 170.
[0044]
The GUI control module 152 receives the alarm information received by the console processing device 20 from the reception control module 158 and presents the alarm information to the user via the input / output device control driver 150. A request for executing a transfer service is received via the transfer service module 150, and processing for sending the request to the transfer service module 156 is performed.
[0045]
Next, FIG. 7 shows a software configuration of the monitor node 18.
[0046]
This software configuration is realized on the monitor node 18 by the CPU 122 executing a program stored in the memory 124, and performs each function described later on the monitor node 18.
[0047]
As illustrated, the software configuration of the monitor node 18 includes a network control driver 198, a communication management module 196, a monitor control driver 180, a monitor control module 184, a reception control module 188, a transmission rate management module 186, a communication quality observation module 182, It has transmission queues 192 and 194 and a reception queue 190.
[0048]
The network control driver 198 controls the network connection controller 126. The communication management module 196 implements, via the network control driver 198, one-to-one communication for transferring a message to a designated device and broadcast communication for transferring a message to all devices connected to a network.
[0049]
The transmission queues 192 and 194 are provided corresponding to different transmission rates.
[0050]
The communication management module 196 transmits the transmission data stored in each of the transmission queues 192 and 194 at a corresponding transmission rate.
[0051]
The transmission rate management module 186 switches the transmission queues 192 and 194 that store the transmission data according to the type of transfer service used for communication of the transmission data.
[0052]
The reception control module 158 processes the reception data received by the communication management module 196 via the transmission queue 190.
[0053]
The monitor control module 184 receives the image data received by the monitor node 18 from the reception control module 158, and controls to display the image data on the monitor 16 via the monitor control driver 180.
[0054]
Upon receiving data from the bandwidth reservation transfer service, the communication quality observation module 182 detects a communication delay by observing the difference between the data transmission interval and the data reception interval. Then, when the communication delay is detected, a delay report is sent to the bandwidth management manager module 160 of the console processing device 20 via the communication management module 196.
[0055]
Next, FIG. 8 shows a software configuration of the camera node 30.
[0056]
This software configuration is realized on the camera node 30 by the CPU 132 executing a program stored in the memory 134, and performs each function described later on the camera node 30.
[0057]
As illustrated, the software configuration of the camera node 30 includes a network control driver 200, a communication management module 202, a camera control driver 218, a camera control module 216, a transmission rate management module 214, a reception control module 210, a transfer service module 212, a transmission It has queues 206 and 208 and a transmission queue 204.
[0058]
The network control driver 200 controls the network connection controller 130.
[0059]
The communication management module 202 implements, via the network control driver 200, one-to-one communication for transferring a message to a specified device and broadcast communication for transferring a message to all devices connected to a network.
[0060]
The camera control driver 218 controls the video camera 40.
[0061]
The camera control module 216 transmits image data obtained by processing data from the video camera 40 via the transmission queues 206 and 208 and the communication management module 202.
[0062]
The transmission queues 206 and 208 are provided corresponding to different transmission rates.
[0063]
The communication management module 202 transmits the transmission data stored in each of the transmission queues 206 and 208 at a corresponding transmission rate.
[0064]
The transmission rate management module 214 switches the transmission queues 206 and 208 that store the transmission data according to the type of transfer service used for communication of the transmission data.
[0065]
The reception control module 210 processes the reception data received by the communication management module 202 via the reception queue 204.
[0066]
The transfer service module 212 manages a transfer service type and a transfer rate of communication performed by the camera node 30.
[0067]
Next, FIG. 9 shows a software configuration of the sensor node 50.
[0068]
This software configuration is realized on the sensor node 50 by the CPU 142 executing a program stored in the memory 144, and performs each function described later on the sensor node 50.
[0069]
As illustrated, the software configuration of the sensor node 50 includes a network control driver 220, a communication management module 222, a sensor control driver 238, a sensor control module 236, a transmission rate management module 234, a transfer service module 237, a reception control module 235, and a reception control module. It has a queue 224, transmission queues 226 and 228, a transfer service module 237, a message management table 232, and an alarm transmission module 230.
[0070]
The network control driver 220 controls the network connection controller 140.
[0071]
The communication management module 222 implements, via the network control driver 220, one-to-one communication for transferring a message to a designated device and broadcast communication for transferring a message to all devices connected to a network.
[0072]
The sensor control driver 238 controls the sensor 60.
[0073]
The transmission queues 226 and 228 are provided corresponding to different transmission rates.
[0074]
The communication management module 222 transmits the transmission data stored in each of the transmission queues 226 and 228 at a corresponding transmission rate.
[0075]
The transmission rate management module 234 switches the transmission queues 226 and 228 for storing the transmission data according to the type of transfer service used for communication of the transmission data.
[0076]
The reception control module 235 processes the reception data received by the communication management module 222 via the reception queue 224.
[0077]
The sensor control module 236 transmits an alarm message to the alarm transmission module 230 according to the input content from the sensor 60.
[0078]
The alarm transmission module 230 transmits an alarm message to the console processing device 20 as alarm information via the transmission queues 206 and 208 and the communication management module 202. The alarm message is stored in the message management table 232.
[0079]
The transfer service module 237 manages a transfer service type of communication performed by the sensor node 50.
[0080]
Hereinafter, the operation of the monitoring system according to the present embodiment will be described.
[0081]
First, the outline will be described.
[0082]
As shown in FIGS. 10 and 11, normally, in this monitoring system, a camera node (30-A to 30-I) for transmitting image data and a monitor node (18-A to 18-I) for receiving image data are provided. While switching, image data is transferred from a plurality of camera nodes (30-A to 30-I) to a plurality of monitor nodes (18-A to 18-I). In parallel with this, the alarm information is transferred to the console processing device 20 from the sensor nodes (50-A to 50-I) where the alarm information has been generated at any time.
[0083]
That is, in FIG. 10, image data is transmitted (502, 504) from the plurality of camera nodes (30-A, 30-8) to the monitor nodes (18-A, 18-B), and the sensor nodes (50-A, 50-B), the alarm information is transferred to the console processing device 20 (506, 508).
[0084]
FIG. 11 shows that the camera node transmitting the image data is switched from the state of FIG. 10 and the image data is transferred from another camera node (30-C, 30-I) to the monitor node (18-C, 18-I). Is transferred (510, 512), and the alarm information is transferred from the sensor node (50-I) to the console processing device 20 (514).
[0085]
As described above, in the present surveillance system, by sequentially switching the camera nodes 30 to which image data is transferred, a user who looks at the monitor 16 is provided with a video patrol that produces an effect as if he / she is patrol and monitoring. Realize. Switching of the camera node 18 is performed by transferring control data for controlling the operation from the console processing device 20 to each camera node 30 and each monitor node 18. How the switching is performed may be determined automatically by the console processing device 20 based on a preset schedule, or may be switched in accordance with a designation of the console processing device 20 by a user who views the monitor 16. You may make it go. The specification from the user may be received by selecting a menu displayed by the console processing device 20 or by selecting a camera icon on a map in which the arrangement of the camera 40 is represented by a camera icon.
[0086]
Further, in the present monitoring system, when the sensor 60 detects any abnormality (fire, intrusion, etc.) during such a video patrol, the sensor node 50 outputs alarm information indicating the content of the detected abnormality. , To the console processing device 20 where the user is located. That is, control data such as alarm information is mixed with the video data and flows on the network 10.
[0087]
In addition, the present monitoring system causes only a specific camera node 30 to transfer image data having a higher definition data amount and a larger data amount to the monitor node 18 than the image data transferred during the video patrol, An emergency transfer function for stopping transfer of image data from the camera node 30 is provided. Such an emergency transfer function, for example, when performing a video patrol, the user can identify the suspicious person by using a higher definition image from a specific camera that has transferred the image of the suspicious person. It is used when you want to check in more detail.
[0088]
As described above, in the present embodiment, communication is performed using three types of transfer services: “bandwidth reservation transfer service”, “statistical multiplex transfer service”, and “emergency transfer service”.
[0089]
The "bandwidth reservation transfer service" is applied to communication of data having a large data size and continuously flowing at a constant transfer rate, such as image data. In the present surveillance system, a bandwidth reservation transfer service is applied to communication of image data from the camera node 30 to the monitor node 18 during video patrol. The camera node 30 performing communication by the band reservation service transmits image data of a predetermined definition (low definition) corresponding to the transfer rate at the transfer rate specified by the console processing unit 20.
[0090]
The “statistical multiplex transfer service” is applied to communication of data whose transfer rate changes. In this monitoring system, the statistical multiplex transfer service is applied to communication of alarm information from the sensor node 50 to the console processing device 20 and communication of control data from the console processing device 20 to each device. The sensor node 50 and the console processing device 20 which perform communication by the statistical multiplex transfer service transfer the generated transfer data at the maximum transfer rate at which the data can be transferred.
[0091]
"Emergency transfer service" is applied to communication with a large data size, which is performed prior to other communication. In the present surveillance system, in the emergency transfer function described above, an emergency transfer service is applied to communication between the camera node 30 and the monitor node 18 that transfer high-definition image data. The camera node 30 performing communication by the emergency transfer service transmits image data of a predetermined definition (high definition) corresponding to the transfer rate at the transfer rate specified by the console processing device 20.
[0092]
The bandwidth that can be used for the communication by the bandwidth reservation transfer service is smaller than the entire effective bandwidth of the network 10. Even when the communication by the bandwidth reservation transfer service is executed, the fixed bandwidth that can be used for the communication by the statistical multiplex transfer service is not changed. Ensure that it is always available. For example, in FIG. 12, assuming that the width of the entire effective band 520 is B1, only the band 522 of B2 is a band that can be allocated to communication by the band reservation transfer service. In this case, at least, the band 524 of B3 can always be used for communication by the statistical multiplex transfer service even when communication is performed by the band reservation transfer service.
[0093]
Here, the bandwidth 524 of B3 to be secured for the communication by the statistical multiplex transfer service is the amount corresponding to the maximum value of the sum of the transfer rates of the communication by the statistical multiplex transfer service which may occur at the same time. Good to do. By doing so, the bandwidth of the network can be used more effectively than in the case where the bandwidth corresponding to the maximum transfer data generation rate is allocated to each communication in which transfer data is generated irregularly. become. Further, it is possible to stochastically secure the immediacy of communication by the statistical multiplex transfer service.
[0094]
However, in the present embodiment, even when the sum of the transfer rates of the communication by the statistical multiplex transfer service exceeds the bandwidth 524 of B3 to be secured for the communication by the statistical multiplex transfer service, the statistical restriction as described later due to the communication restriction described above. Immediate communication of multiplex transfer service.
[0095]
Actually, as shown in FIG. 13, the band used for communication by the statistical multiplex transfer service may be the band 526 of B3 ′ smaller than the band 524 of B3. As shown in FIG. 14, the band used for communication by the band reservation transfer service is a band 529 of B2 ′ smaller than the band 522 of B2, and the band used for communication by the statistical multiplex transfer service is B3 of B3. There is a possibility that the band 528 of B3 ′ is larger than the band 524.
[0096]
This state occurs when the communication by the band reservation transfer service is the number of communication times the transfer rate of each communication <the band 522 of B2, and the transfer rate of the communication by the statistical multiplex transfer service exceeds the band 524 of B3. . In this embodiment, this state is the sum of the bandwidths allocated to the communication by the bandwidth reservation transfer service <the bandwidth 522 of B2, and the other state when the transfer rate of the communication by the statistical multiplex transfer service exceeds the bandwidth 524 of B3. This also occurs when a communication restriction described later is performed.
[0097]
The band available for communication by the emergency transfer service is a fixed band as shown in FIG. 15, but this band is smaller than the entire effective band of the network 10, and even when communication by the emergency transfer service is executed, A constant band usable for communication by the statistical multiplex data service is always secured.
[0098]
Hereinafter, a sequence in which communication according to each transfer service type is executed will be described.
[0099]
First, communication by the bandwidth reservation transfer service will be described.
[0100]
As shown in FIG. 16, when performing communication using the bandwidth reservation transfer service, the operator console processing device 20 specifies a node that performs communication using the band reservation transfer service, according to selection from a user or a predetermined user program. Upon receiving an instruction to execute the transfer service (600), the transfer service module 156 issues a band reservation request 602 to the band management manager module 160. The bandwidth management manager module 160 returns a bandwidth reservation OK 604 if there is a free bandwidth available for communication by the bandwidth reservation transfer service. In response, the transfer service module 156 broadcasts a band reservation transfer request including a list of nodes performing communication by the band reservation transfer service and a designation of a transfer rate of the communication (606). The camera node 30 instructed to transfer during the bandwidth reservation transfer request receives the request and starts image transmission to the monitor node 18 at the transfer rate specified in the bandwidth reservation transfer request (608, 610). The camera node 30 that has started the image transmission continues the image transmission until the next stop request is received (612, 614).
[0101]
Next, communication by the statistical multiplex transfer service will be described.
[0102]
In the case of performing communication by the statistical multiplex transfer service, in the console processing device 20, the instruction from the user or the execution of the statistical multiplex transfer service by a predetermined user program is specified together with the designation of the node performing the communication by the statistical multiplex transfer service. The transfer service module 156 broadcasts a statistical multiplex transfer request including a list of nodes that perform communication by the statistical multiplex transfer service.
[0103]
As shown in FIG. 17, when the sensor 60 detects an abnormality in the sensor 60 (620, 624), the sensor node 50, which has been requested to perform communication by the statistical multiplex transfer service in response to the statistical multiplex transfer request, processes the alarm information 622, 626 into the console processing. The data is transferred to the device 20 at the maximum transfer rate that can be transferred. Here, the maximum transfer rate at which transfer is possible is a band that can be used by the sensor node 50 according to the protocol of the network 10.
[0104]
For example, the case where the network is Ethernet is as follows. That is, in the Ethernet, each node can perform data transmission when another node is not performing data transmission. Also, if a collision occurs in data transmission of a plurality of nodes on the network, one node is given the right to transmit data according to the CSMA / CD protocol. Further, which node is given the communication right is determined at random. Therefore, the maximum transfer rate at which the sensor node 50 can transfer is the transfer rate that was actually transmitted according to the CSMA / CD protocol when trying to transmit all the alarm information to be transmitted.
[0105]
Note that, in the present embodiment, the case where the network is Ethernet is described as an example, but this is a network using another method such as a network using another communication medium using the CSMA / CD protocol. It doesn't matter.
[0106]
For this reason, the generation rate of the alarm information to be transmitted by the communication by the statistical multiplex transfer service from the sensor node 50 is changed to the B3 band 524 reserved for the communication by the statistical multiplex transfer service shown in FIG. If the number increases, the chance of data transmission between the sensor node 50 and the camera node 30 colliding increases, and data transmission is permitted to the sensor node 50 with a certain probability. The transfer at the specified transfer rate cannot be performed, and the image data transferred from the camera node 30 to the monitor node 18 is delayed.
[0107]
Next, communication by the emergency transfer service will be described.
[0108]
Communication by the emergency transfer service is realized by the sequence shown in FIG.
[0109]
Now, in a state where the camera nodes 30-A and 30-B are transferring image data by communication using the band reservation transfer service, the execution of the emergency transfer service is performed by the user's selection or designation of a predetermined user program. 242, the transfer service module 156 requests a list of nodes to stop data transfer, a list of nodes to start data transfer of high-definition images, And an urgent transfer request including the transfer rate designation of the data transfer (step 244). The camera node 30 instructed to stop the data transfer (246, 248) during the urgent transfer request receives the instruction and stops the data transfer (250, 252). The camera node 30 instructed to transfer the high-definition image data (256) during the urgent transfer request transmits the image data to the monitor node 18 at the high-definition image transfer rate specified during the urgent transfer request. Start (254).
[0110]
Hereinafter, the above-described communication regulation will be described.
[0111]
Communication restrictions mean that when network traffic increases, the transfer rate of communication by the bandwidth reservation transfer service is reduced to avoid the occurrence of failures such as data loss at nodes, and that communication by the statistical multiplex transfer service is reduced. This is done without delay.
[0112]
FIG. 19 shows a sequence for implementing the communication restriction.
[0113]
As shown in the figure, in the present monitoring system, the monitor node 18 that receives image data by communication using the bandwidth reservation transfer service monitors whether the delay of the image data does not exceed a predetermined level (266). Here, for example, the delay is obtained by calculating a transmission interval and a reception interval from a transmission time given to image data at the time of transmission and a reception time when image data is actually received. Is determined by comparing The transmission time given to the image data at the time of transmission is the time at which the preparation for transmission of the image data to the network 10 is completed, not the time when the image data is actually transmitted to the network 10. The transmission of the image data to the network is actually performed at a time when the network 10 can transmit the image data. Therefore, when the traffic of the network 10 increases, a delay occurs between the transmission time given to the image data and the actual transmission time, and these are accumulated sequentially.
[0114]
The monitor node 18 that has detected that the delay has exceeded the predetermined level reports the delay to the bandwidth management manager module 160 of the console processing device 20 (264), and upon receiving this, the bandwidth management manager module 160 changes the transfer rate. A communication restriction request including a list of nodes to be lowered and designation of a transfer rate after the reduction is broadcast simultaneously (268). Here, the node that reduces the transfer rate is the camera node 30 that is performing communication using the band reservation transfer service.
[0115]
Note that the bandwidth management manager module 160 may issue a communication restriction request immediately after receiving the delay report, but may issue a communication restriction request when receiving a delay report from a predetermined number or more of the monitor nodes 18. Alternatively, a communication restriction request may be issued when a delay report is received from a certain number or more of monitor nodes within a certain time.
[0116]
The camera node 30 instructed to lower the transfer rate in the communication restriction request (270, 272) lowers the transfer rate to the transfer rate instructed in the communication restriction request and performs transmission (274, 276). Note that the specification of the reduced transfer rate to be included in the communication restriction request may be a specific value (e.g., c based on a transfer rate magnification of 30 mse (e.g., x0.5)) or may be lower than the transfer rate before the reduction. Good later.
[0117]
The delay report may be transmitted from the monitor node 18 when the fluctuation of the image data reception time interval is observed at the monitor node 18 and the fluctuation exceeds a certain level. Further, the fluctuation of the image data reception time interval may be observed in the camera node 30 instead of the monitor node 18 and the camera node 30 may transmit the delay report when the fluctuation exceeds a certain level.
[0118]
Incidentally, the communication restriction may be realized by the sequence of FIG. 20 instead of the sequence of FIG.
[0119]
In the sequence shown in FIG. 20, the monitor node 18 that has detected (630) that the delay has exceeded the predetermined level, instead of the console processing device 20, directly broadcasts the communication restriction request directly (see FIG. 20). 632). However, in this case, the monitor node 18 separately manages the camera node 30 which is currently performing the communication by the band reservation transfer service, and generates a list of nodes from which the transfer rate to be included in the communication restriction request is reduced. Otherwise, if the communication restriction request does not include the list of nodes that lower the transfer rate, and the camera node 30 performing the communication by the bandwidth reservation transfer service receives the broadcast communication restriction request Automatically lowers its own transfer rate.
[0120]
Next, an operation of releasing such communication restriction will be described.
[0121]
The release of the communication restriction is realized by the sequence shown in FIG.
[0122]
Image data is being transferred from the camera node 30-A to the monitor 16-A and from the camera 30-B to the monitor 16-B at the transfer rate (270, 272) reduced by the communication regulation (300, 302). At this time, when the monitor nodes (16-A, 16-B) that have reported the delay detect that the delay has fallen below the predetermined level (301, 303), it is determined that the traffic load of the network has decreased. Then, a delay elimination report is sent to the bandwidth management manager module 160 of the console processing device 20 (304, 305).
[0123]
In response to this, the bandwidth manager module 160 of the console processing device 20 transmits a communication restriction release request including a list of nodes for which the transfer rate is to be increased and a designation of the transfer rate after the increase in order to return the transmission to the normal state. Broadcast (306). The camera node 30 designated to increase the transfer rate in the communication restriction release request changes the transmission rate of the image data to the original transfer rate specified in the communication restriction release request (308, 310). Transmission is performed (312, 314).
[0124]
Here, the bandwidth management manager module 160 gradually returns the transfer rate of the camera node whose transfer rate has been reduced by the communication restriction request to the original transfer rate. For this purpose, the bandwidth management manager module 160 broadcasts a plurality of communication restriction release requests (306, 316) for sequentially increasing the transfer rate up to the forward dimension transfer rate at intervals. However, if a delay report is received before the transfer rate is increased to the original transfer rate, the issuance of the subsequent communication restriction release request is canceled, and the communication restriction request is issued in the same manner as described above.
[0125]
Note that the bandwidth manager module 160 may start issuing the communication restriction release request immediately after receiving the delay release report, but may receive the communication restriction release request from a predetermined number of monitor nodes. May be started, or when a delay elimination report is received from a certain number or more of monitor nodes within a certain period of time, the issuance of a communication restriction release request may be started.
[0126]
By the way, the release of the communication restriction may be realized by a sequence shown in FIG. 22 instead of the sequence shown in FIG.
[0127]
In the sequence of FIG. 22, the camera nodes (30-A, 30-B) whose transfer rates have been reduced by the communication restriction request autonomously release the communication restriction.
[0128]
After lowering the transfer rate according to the communication restriction request (270, 272), the camera node 30 activates an internal timer, and after a certain period of time, increases the transmission rate (308, 310). Then, a new timer is started, and after a certain period of time, the transmission rate is increased again (318, 320). Then, the process of increasing the transmission rate is repeated until the transfer rate returns to the transfer rate before the transmission rate was reduced by the communication restriction request.
[0129]
By employing the communication restriction release sequence shown in FIG. 22 and the communication restriction sequence shown in FIG. 20, the communication restriction function can be realized without the band management manager 160.
[0130]
Hereinafter, details of the present monitoring system that realizes the above operation will be described.
[0131]
First, FIG. 23 shows the contents of the bandwidth information table 154 provided in the console processing device 20.
[0132]
The bandwidth information table 154 has an entry for each communication performed by the bandwidth reservation transfer service. In each entry, an area 332 indicates an identifier for identifying a reserved band, an area 334 indicates a bandwidth at the time of communication by the band reservation transfer service, an area 336 indicates a bandwidth during communication restriction, and an area 338 indicates a band. The transmission rate value at the time of communication by the reservation transfer service is stored, the area 340 stores the transmission rate value used at the time of communication restriction, and the area 342 stores the transmission rate value currently used.
[0133]
Next, FIG. 24A shows a format of communication data transmitted and received among the console processing device 20, the camera node 30, the monitor node 18, and the sensor node 60.
[0134]
The communication data 350 takes the form of message packets, and each message packet sets an area 352 for setting a transaction code TCD indicating the type of message, an area 354 for setting a source address SA, and an address DA of a destination device. And an area 358 for setting the data length L of the message 356, and an area 356 for storing the message DATA.
[0135]
Here, a transaction code (hereinafter referred to as “TCD”) corresponding to each message type and an address of each device are set in advance.
[0136]
In addition, the communication management module of each device broadcasts a message packet having a TCD designated to be received in advance on a network or a message packet having the address of its own node as an address DA of a destination device. To receive. Also, a message packet in which a destination address DA is set to a predetermined value, for example, “0”, is handled as a broadcast message packet. That is, when performing simultaneous broadcast, the communication management module of each device sets “0” to the destination address DA, transmits the message packet to the network, and sets “0” to the destination address DA of the received message packet. Is set and received and processed as a broadcast message packet.
[0137]
Further, the reception control module of each device performs a process of distributing a message packet received by the communication management module to a module according to the value of the TCD.
[0138]
The contents of various message packets transmitted according to such a format will be described.
[0139]
First, the contents of the above-mentioned message packet of the communication restriction request will be described.
[0140]
As shown in FIG. 24 (b), the message packet 350-A of the communication restriction request includes "communication restriction" for the TCD 352-A and the console processing device 20 for transmitting this request to the SA area 354-A. The address is "0" designating broadcast in the DA area 356-A, "128" byte is in the data length L area 358-A, and the data area 360-A has a normal address for communication regulation. A lower transmission rate value, for example, 30 msec is set.
[0141]
Next, the contents of the message packet of the communication restriction release request described above will be described.
[0142]
As shown in FIG. 24 (c), the message packet 350-B of the communication restriction release request transmits "communication restriction release" to the TCD 352-B and the console processing device which transmits this request to the SA area 354-B. The address 20 is “0” designating broadcast in the DA area 356-B, “128” bytes in the data length L area 358-B, and the communication restriction release is written in the data area 360-B. A transmission rate value, for example, 15 msec, which is higher than the value at the time of the regulation is set.
[0143]
Next, the contents of the above-described delay report message packet will be described.
[0144]
As shown in FIG. 24 (d), the delay report message packet 350-C indicates "delay report" for the TCD 352-C, the address of the monitor node 18 transmitting this report for the SA area 354-C, The DA area 356-C contains the address of the console processing device 20 to which this report is transmitted, the data length L area 358-C of the message body contains "128" bytes, and the data area 360-C Is set to the average value of the difference between the transmission interval and the reception interval observed by the monitor node.
[0145]
Next, the contents of the above-described delay cancellation report message packet will be described.
[0146]
As shown in FIG. 24 (e), the message packet 350-D of the delay elimination report contains "delay elimination report" for the TCD 352-D and the address of the monitor node 18 transmitting this report for the SA area 354-D. In the DA area 356-D, the address of the console processing unit 20 to which this report is transmitted, "128" bytes in the data length L area 358-D of the message body, and the data area 360. In -D, the average value of the difference between the transmission interval and the reception interval observed by the monitor node 18 is set.
[0147]
Next, the contents of a message packet for transmitting image data from the camera node 30 to the monitor node 18 will be described.
[0148]
As shown in FIG. 24 (f), the message packet 350-E of the image data includes “image data” in the TCD 352-E, the address of the camera node 30 transmitting this report in the SA area 354-E, The DA area 356-E stores the address of the monitor node 18 which is the destination for transmitting the image data, the message length L area 358-E of the message body stores "1.5" kilobytes, and the data area 360-E. “E” stores “transmission time”, “image data”, and “monitor number” of the monitor to which the image data is output, which created the message packet.
[0149]
The message packet for transmitting the alarm information from the sensor node 60 to the console processing device 20 also has the same format. In this case, the “alarm information” is stored in the TCD 352-E, The area 354-E contains the address of the sensor node 60 that sends this report, the DA area 356-E contains the address of the console processing unit 20 that is the destination for sending this alarm information, and the data length L of the message body. The area 358-E stores the length of the alarm information, and the data area 360-E stores the alarm information.
[0150]
Next, the contents of the message packets of the bandwidth reservation transfer request, the statistical multiplex transfer request, and the emergency transfer request will be described.
[0151]
As shown in FIG. 24 (g), in these message packets 350-F, "bandwidth reservation transfer", "statistical multiplex transfer", and "emergency transfer" are stored in the TCD 352-F, respectively, in the SA area 354-F. Stores the address of the console processing unit 20 transmitting this request, "0" designating broadcast in the DA area 356-F, and "256" bytes in the data length L area 358-F. Then, in the case of a bandwidth reservation transfer request, the data area 360-F stores a "bandwidth identifier" assigned to each communication for performing communication by the bandwidth reservation transfer service. In addition, a “camera number list” and a “monitor number list” that specify a transfer source input device and a transfer destination output device in each communication, and a “transmission rate value list” that specifies a transfer rate of each communication are set. . That is, the Nth in each list is the camera number, monitor number, and transmission rate value of the Nth communication.
[0152]
In the data area 360-F, if there is a statistical multiplex transfer request, a "sensor node number list" and a "control console process" that specify a transfer source and a transfer destination in each communication for performing communication by the statistical multiplex transfer service. And a device number list.
[0153]
In the data area 360-F, if the request is an emergency transfer request, a "camera number list" and a "monitor number list" for specifying a transfer source and a transfer destination in communication for performing communication by the emergency transfer request service are provided. “Transmission rate value” that specifies the transfer rate of communication by the emergency transfer request service is stored.
[0154]
Note that the camera number and the monitor number are unique numbers given in advance for each camera and each monitor.
[0155]
Hereinafter, the details of the operations of the console processor 20, the camera node 30, the monitor node 18, and the sensor node 60 will be described.
[0156]
First, the operation of the bandwidth management manager module 160 of the console processing device 20 will be described.
[0157]
FIG. 25 shows a processing procedure of the processing performed by the bandwidth management manager module 160.
[0158]
When activated, the bandwidth management manager module 160 enters a data waiting state (process 372). When a message packet received via the network 10 is delivered from the reception control module 158 or a bandwidth reservation request or a bandwidth release request is received from the transfer service module 156 (process 374), if the message packet is delivered, the TCD Is checked (process 378). When the TCD is “delay report”, the transfer rate after the communication regulation of the communication by the bandwidth reservation transfer service is referred to the regulation bandwidth 336, the regulation transmission rate 340, and the use transmission rate 342 in the bandwidth information table 154. (Processing 380), the used transmission rate 342 of the bandwidth information table 154 is updated to the determined transfer rate (processing 382), and a message packet of the above-mentioned communication restriction request is created (processing 384). (Step 386).
[0159]
On the other hand, if the TCD is “delay resolution report” in the determination of the process 378, the bandwidth reservation transfer is performed by referring to the bandwidth 336, the regulated transmission rate 340, and the used transmission rate 342 of the bandwidth information table 154. The transfer rate of the communication by the service after the communication restriction is released is determined (step 381), the used transmission rate 342 of the bandwidth information table 154 is updated (step 383), and the above-mentioned message packet of the communication restriction release request is created (step 383). 385), and transmits it to the network 10 via the communication management module 172 (process 387). However, as described above, the change of the transfer rate in response to the communication restriction release request may be performed stepwise.
[0160]
In addition, when the bandwidth reservation request is received in the determination of the process 378, it is determined whether or not there is a free bandwidth by referring to the bandwidth information table 154 (process 388).
If there is a free band, a new entry is created in the band information table 154 (step 390), and the transmission rate of the communication by the band reservation transfer service of the communication targeted for the band reservation request is registered in the used transmission rate 342 (step 392). ), And returns the band identifier 332 registered in the entry of the created band information table 154 to the transfer service module 156 (process 394). If there is no free band in the determination of the process 390, a message indicating that the band cannot be reserved is returned to the transfer service module 156 (process 398).
[0161]
If it is determined in step 378 that the band release has been received, the entry in which the band identification included in the band reservation request is registered is deleted from the band information table 156 (step 396).
[0162]
Next, the operation of the transfer service module 156 of the console processing device 20 will be described.
[0163]
FIG. 26 shows a processing procedure of the processing performed by the transfer service module 156.
[0164]
The transfer service module 156 enters a data waiting state upon activation (process 702), and issues a transfer service execution request from a user or a user program to the type of the transfer service and information on the transmission source and destination of communication by the transfer service. When the transfer service type is received (process 704), the transfer service type is determined (process 706).
[0165]
If the determined transfer service type is “emergency transfer”, a message packet of the above-described emergency transfer request is created (process 708) and transmitted via the communication management module 172 (process 710).
[0166]
On the other hand, if the transfer service type determined in the process 706 is “bandwidth reservation transfer”, a bandwidth reservation request is issued to the bandwidth management manager module 160 (process 712), and the bandwidth reservation succeeds and the band identifier is returned. If it is (process 714), the above-mentioned bandwidth reservation transfer request packet is created (process 716) and transmitted via the communication management module 172 (process 718). Further, the transfer service module 256 manages the correspondence between the transmission source and the transmission destination performing the communication by the band reservation transfer service and the band identifier returned from the band management manager module 160 for the band reservation for this communication.
[0167]
On the other hand, if the transfer service type determined in the process 706 is “statistical multiplex transfer”, a message packet of the above-described statistical multiplex transfer request is created immediately (process 722) and transmitted via the communication management module 172 (process 724). ).
[0168]
In addition, when the transfer service module 240 receives a stop request of the band reservation service from the user or the user program together with information on a transmission source and a transmission destination for stopping communication by the band reservation service, the transfer service module 240 performs the above-described band release. It also performs processing for sending to the bandwidth management manager module 160 along with the bandwidth identifiers corresponding to the source and destination.
[0169]
The transmission of the message packet from the console processing device 20 is performed by the statistical multiplex transfer service.
[0170]
Next, a process performed by the transfer service module 212 in the camera node 40 will be described.
[0171]
FIG. 27 shows a procedure of processing performed by the transfer service module 212 of the camera node 40.
[0172]
When activated, the transfer service module 212 waits for a message packet from the reception control module 210 (process 402). If the message packet has been passed (step 404), the TCD is checked (step 406), and the TCD determines one of “bandwidth reservation transfer”, “urgent transfer”, “communication restriction” and “communication release”. If so, the "camera number list", "monitor number list", and "transmission rate value list" are checked (step 406).
[0173]
If the TCD is “bandwidth reservation transfer” or “urgent transfer” and the camera number of the own node that is not currently transmitting image data is included in the camera number list, it is designated by “transmission rate value list”. The transmitted transfer rate and camera number are transmitted to the transmission rate management module 214, the camera control module 430 is activated, and the start is transmitted together with the camera number and transmission rate (process 430a). If the camera number of the own node that is currently transmitting the image data is not included in the camera number list, a stop request is issued to the camera control module 430 and the transmission rate management module 214 together with the camera number (process 430b).
[0174]
Also, the camera number of the own node that is currently transmitting the image data is included in the camera number list, and the transfer rate specified in the “transmission rate value list” is the transfer rate at which the image data is currently being transmitted. If not, the camera number and the designated transfer rate are transmitted to the transmission rate management module 214 and the camera control module 216. If the TCD is “communication restriction” or “communication restriction release”, all the camera numbers currently transmitting and the transfer rate transmitted in the message packet are transmitted to the transmission rate management module 214 and the camera control module 216. (Process 408).
[0175]
The camera control module 216 generates an image with a definition defined for the transmitted transfer rate from the video data from the camera with the camera number.
[0176]
When the camera number and the transfer rate are transmitted from the transfer service module 212, the transmission rate management module 214 transmits the transmission queues 206 and 208 used for transmitting the image data corresponding to the camera number according to the transmitted transmission rate. Switch. When the camera number and the stop request are transmitted, the transmission of the image data corresponding to the camera number is stopped.
[0177]
Next, processing of the camera control module 216 in the camera node 30 will be described.
[0178]
FIG. 28 shows a procedure of processing performed by the camera control module 216.
[0179]
When activated, the camera control module 216 determines whether a stop request or a start request has been transmitted (operation 432). If the request is a start request, image data is taken in from the camera 40 of the transmitted camera number (process 434), image data of a definition corresponding to the transmitted transfer rate is generated, and transmitted by the "monitor number list". The address of the monitor node 18 having the monitor of the monitor number corresponding to the camera number is set as the destination address DA, and a message packet of image data to which the monitor number and the transmission time are added is created (processing 436). , 208 via the communication management module 202 (step 438).
[0180]
The operations from the process 434 to the process 438 are continued until a stop request is issued. However, when the transfer rate is transmitted, the definition of the image data is changed to the definition corresponding to the transmitted transfer rate.
[0181]
If it is determined in step 432 that the stop request has been transmitted, the generation of image data from the camera 40 having the transmitted camera number is stopped (step 440).
[0182]
Next, processing in the reception control module 188 of the monitor node 18 will be described.
[0183]
FIG. 29 shows the procedure of the process of the reception control module 188.
[0184]
When activated, the reception control module 188 first enters a reception waiting state (process 452). When the message packet is received from the reception management module 202 (process 454), the contents of the TCD are determined (process 456). If the TCD is image data, the header is removed (step 458), the image data and the monitor number are passed to the monitor control module 184 (step 460), and the transmission time is passed to the communication quality management module 182. The reception time of the message packet is also sent to the reception quality management module 182.
[0185]
The monitor control module 184 converts the passed image data into the received monitor number.
Display on the monitor.
[0186]
Next, the processing of the communication quality observation module 182 of the monitor node 18 will be described.
I do.
[0187]
FIG. 30 shows the procedure of the processing of the communication quality observation module 182.
[0188]
The reception time of the image data received from the reception control module 188 and the transmission time added to the image data are passed to the communication quality observation module 182. The communication quality observation module 182 checks a difference between the reception time interval and the transmission time interval (process 462), and determines whether the difference exceeds a threshold value (process 468). If the threshold value is exceeded, a message packet of the above-described delay report request is created and transmitted to the console processing device 20 (process 470).
[0189]
When the communication restriction is performed in accordance with the sequence shown in FIG. 20, if the threshold value is exceeded after the determination in the process 468, the communication restriction request is broadcast from the monitor node 18 at once.
[0190]
Hereinabove, one embodiment of the present invention has been described.
[0191]
In the above-described embodiment, the communication by the bandwidth reservation transfer service is described as being activated when an execution request for the bandwidth reservation transfer service is input to the console processing device 20 from a user or a user program. The communication by the band reservation transfer service may be activated in response to a request issued from a node or the like that intends to perform communication by the band reservation transfer service.
[0192]
For example, as shown in FIG.
[0193]
In FIG. 31, the sensor node 50-A connected to the sensor that has detected the alarm abnormality reports an alarm abnormality to the camera node 30-A disposed immediately near (732), and transfers the camera node 30-A receiving the report. The service module 237 issues a bandwidth reservation request including the transmission rate used for transmission to the console processing device 20 via the communication management module 222 in order to transmit an image of the scene of the abnormality to the monitor (734).
[0194]
The transfer service module 156 of the console processing device 20 transmits this to the bandwidth management manager module 160 (738). If the bandwidth management manager module 160 can secure the bandwidth corresponding to the transmission rate included in the bandwidth reservation request, The message packet of the bandwidth reservation notification is sent to the camera node 30-A that issued the bandwidth reservation request (740). In response to this, the camera node 30-A transmits a message packet of the image data (736).
[0195]
The transmission of the message packet of the image data from the camera node 30-A is automatically terminated, for example, by setting a timer and after a certain period of time from the start of transmission, or from the console processing device 20 based on a user instruction. (742) when the transfer end command is received.
[0196]
In any case, when ending the transmission of the message packet, the camera node 30-A issues a bandwidth release request to the bandwidth management manager module 160 of the console processing device 20 (744).
[0197]
The transfer service module 156 of the console processing device 20 transmits this to the band management manager module 160, and the band management manager module 160 releases the band allocated to the camera node 30-A.
[0198]
The bandwidth reservation request, the bandwidth reservation notification, and the bandwidth release request used in the above processing may be transmitted and received as the following message packets.
[0199]
FIG. 32A shows the contents of a message packet for a bandwidth reservation request. In this message packet 350-G, "bandwidth request" is sent to TCD 352-G, the address of the camera node transmitting this report is sent to SA area 354-G, and the destination of this message packet is sent to DA area 356-G. , The address of the console processing unit 20, “128” bytes in the data length L area 358 -G of the message body, and the camera node 30 -A in the data area 360 -G transfer the image data. To store the desired bandwidth. However, the band may be represented by the quality of the image data to be transferred, for example, the number of pixels, the frame rate, or the like.
[0200]
Next, FIG. 32 (b) shows the contents of the message packet of the band securing notification.
[0201]
In this message packet 350-H, “secure band” is stored in the TCD 352-H, the address of the console processing unit 20 transmitting this report is stored in the SA area 354-H, and this data is stored in the DA area 356-H. The address of the camera node that is the destination of transmission is allocated to the data length L area 358-H of the message body, "128" bytes, and the data area 360-H is allocated to the camera node bandwidth reservation request. The "bandwidth identifier" of the bandwidth, the "transmission rate value" when image data is transmitted from the camera node, the monitor number of the image data transmission destination, and the like are stored.
[0202]
FIG. 32 (c) shows the contents of the message packet of the bandwidth release request.
[0203]
In this message packet 350-I, "bandwidth release" is set in the TCD 352-I, the address of the camera node that issued this request is set in the SA area 354-I, and the console processing of the request destination is set in the DA area 356-I. The address of the device 20 is stored in the data length L area 358-I area of the message body portion as "128" bytes, and the data area 360-I stores the "bandwidth identifier" of the band to be released.
[0204]
Further, in the above embodiment, at the time of the communication restriction, the communication by the band reservation transfer service is subjected to the communication restriction, that is, the transfer rate is reduced. However, the communication is restricted according to the purpose of use of the monitoring system. For example, when data is emphasized, the communication using the statistical multiplex transfer service may be changed so as to be subject to communication restriction. In this case, each node that is a transmission source of the communication by the statistical multiplex transfer service lowers its transmission rate by the amount specified in the communication restriction request.
[0205]
Further, in the above embodiment, at the time of communication restriction, all of the communication by the band reservation transfer service is subject to the communication restriction. May be changed. For example, only the communication by the band reservation transfer service performed by one or a plurality of nodes designated by the user in advance may be subject to communication restriction.
[0206]
As described above, according to the first embodiment, a fixed bandwidth is allocated by the bandwidth reservation transfer service to each communication in which transfer data is generated regularly, and each communication in which transfer data is generated irregularly is allocated to each communication. The statistical multiplex transfer service allows a more effective use of the bandwidth of the entire network by allocating a fixed bandwidth to all of these communications instead of individual communications.
[0207]
In addition, communication regulations dynamically reduce the bandwidth of communication of less important data according to network traffic, thereby preventing delay or loss of communication of more important data. In.
[0208]
Hereinafter, a second embodiment of the present invention will be described.
[0209]
In the first embodiment, the monitor node 18 that receives image data detects the image data detected from the transmission time given to the image data by the camera node 30 and the actual reception time of the image data of the monitor node 18. The network traffic is grasped according to the delay of the communication, and the communication restriction and the cancellation are performed accordingly.
[0210]
However, in this case, depending on the configurations and capabilities of the monitor node 18 and the camera node 30, it may not be possible to correctly grasp network traffic.
[0211]
That is, the processing delay between the time when the camera control module 216 of the camera node 30 gives the transmission time to the image data and the time when the image data is actually transmitted to the network does not depend on the traffic of the network. Or a delay due to a processing delay in the monitor node 18 irrespective of network traffic from when the monitor node 18 receives the image data to when the reception control module 188 determines the reception time. is there. In such a case, the monitor node 18 cannot correctly grasp the traffic of the network.
[0212]
For example, the camera control module 216 of the camera node 30 and the reception control module 188 of the monitor node 18 are each executed as one task by the CPU of the node. Here, when there are a plurality of tasks in the node, the camera control module 216 and the reception control module 188 are scheduled to be executed while being switched with other tasks within the processing capability of the CPU. Therefore, when the processing load of other tasks to be executed increases, a delay occurs between transmission and reception of image data to and from an actual network and processing of image data by tasks of the camera control module 216 and the reception control module 188. May occur. In this case, the processing delay in each node is included in the delay of the detected image data, and it becomes impossible to correctly grasp network traffic.
[0213]
Therefore, in the second embodiment, it is possible to grasp the traffic of the network more accurately and in detail, and to appropriately and finely control the band used by the communication of each node.
[0214]
FIG. 33 shows a configuration of a monitoring system according to the second embodiment.
[0215]
As shown, in the present monitoring system, the camera 40 is connected to the network 10 via the camera node 30, the sensor 60 is connected via the sensor node 50, and the monitor 16 is connected via the monitor node 18, respectively. The console processing device 20 operated by the user is also connected to the network 10. The console processing device 20 is configured by a personal computer, a workstation, or the like, and is equipped with a display 14, a mouse 24 as an input device, and a keyboard 22. Further, a bandwidth control controller node 80 is connected to the network 10.
[0216]
The user 12 operates the monitoring system using the console processing device 20.
Note that a plurality of console processing devices 20 may be provided. In such a configuration, an image from the camera 40 is displayed on the monitor 16 via the network 10 based on an instruction from the console processing device 20. When the sensor 60 detects an abnormality such as a fire or intrusion, the alarm information is displayed on the plurality of monitors 16 via the network 10.
[0219]
Here, the hardware configurations of the console processing device 20, the monitor node 18, the camera node 30, and the sensor node 50 are the same as those described in the first embodiment.
[0218]
As shown in FIG. 34, the bandwidth control controller node 80 has a hardware configuration in which a CPU 802, a memory 804, and a network connection controller 806 are connected by a bus 808.
[0219]
Here, the network connection controller 806 is configured to be able to capture all packets flowing through the network 10. For example, in the case where the network is Ethernet, the network connection controller 806 performs reception in the all-packet reception mode (promiscuous mode), so that the network connection controller 806 captures all packets on the Ethernet. To
[0220]
Next, FIG. 35 shows a software configuration of the console processing device 20.
[0221]
This software configuration is realized on the monitoring console processing device 20 by the CPU 102 executing a program stored in the memory 104, and performs each function described later on the console processing device 20.
[0222]
As illustrated, the software configuration of the console processing device 20 includes a network control driver 974, a communication management module 972, an input / output device control driver 950, a GUI control module 952, a transfer service module 956, a bandwidth management manager module 960, a transmission rate It has a management module 964, a band information table 954, a reception control module 958, transmission queues 966, 968, and a reception queue 970.
[0223]
The network control driver 974 controls the network connection controller 112. The communication management module 972 implements communication for transferring a message to a specified device via the network control driver 974.
[0224]
The input / output control driver 950 controls the monitor 14, the keyboard 22, and the mouse 24.
[0225]
The transfer service module 956 specifies the type of transfer service to be used for each node via the communication management module 972. Here, the transfer service type includes "bandwidth reservation transfer service", "statistical multiplex transfer service", "emergency transfer service", and the like.
[0226]
The band management manager module 960 performs reservation and release of a band according to the transfer service type of each communication in cooperation with the band control controller node 80. Further, the bandwidth management manager module 960 transmits a bandwidth information table 954 indicating the transfer service type of each communication and the reserved content of the bandwidth to the bandwidth control controller node 80, and instructs the bandwidth control controller node 80 according to the bandwidth information table. Communication restrictions and their cancellation.
[0227]
The communication queues 966 and 968 are provided corresponding to different transmission rates.
[0228]
The communication management module 972 transmits the transmission data stored in each of the transmission queues 966 and 968 at a corresponding transmission rate.
[0229]
The transmission rate management module 964 switches the transmission queues 966 and 968 that store the transmission data according to the type of transfer service used for communication of the transmission data.
[0230]
The reception control module 958 processes the reception data received by the communication management module 972 via the reception queue 970.
[0231]
The GUI control module 952 receives the alarm information received by the console processing device 20 from the reception control module 958, and presents the received alarm information to the user via the input / output device control driver 950. A process for receiving a transfer service execution request via the 950 and transmitting the request to the transfer service module 956 is performed.
[0232]
Next, FIG. 36 shows a software configuration of the monitor node 18.
[0233]
This software configuration is realized on the monitor node 18 by the CPU 122 executing a program stored in the memory 124, and performs each function described later on the monitor node 18.
[0234]
As illustrated, the software configuration of the monitor node 18 includes a network control driver 998, a monitor control driver 980, and a reception control module 988.
[0235]
The network control driver 998 controls the network connection controller 126.
[0236]
The reception control module 988 processes the received data.
[0237]
The monitor control driver 980 performs control to receive the image data received by the monitor node 18 from the reception control module 988 and display the image data on the monitor 16.
[0238]
Next, FIG. 37 shows a software configuration of the camera node 30.
[0239]
This software configuration is realized on the camera node 30 by the CPU 132 executing a program stored in the memory 134, and performs each function described later on the camera node 30.
[0240]
As illustrated, the software configuration of the camera node 30 includes a network control driver 1000, a communication management module 1002, a camera control driver 1018, a camera control module 1016, a transmission rate management module 1014, a reception control module 1010, a transfer service module 1012, and a transmission service module. It has queues 1006 and 1008 and a reception queue 1004.
[0241]
The network control driver 1000 controls the network connection controller 130.
[0242]
The communication management module 1002 implements communication for transferring a message to a specified device via the network control driver 1000.
[0243]
The camera control driver 1018 controls the video camera 40.
[0244]
The camera control module 1016 transmits image data obtained by processing data from the video camera 40 via the transmission queues 1006 and 1008 and the communication management module 1002.
[0245]
The transmission queues 1006 and 1008 are provided corresponding to different transmission rates.
[0246]
The communication management module 1002 transmits the transmission data stored in each of the transmission queues 1006 and 1008 at a corresponding transmission rate.
[0247]
The transmission rate management module 1014 switches transmission queues 1006 and 1008 that store transmission data according to the type of transfer service used for communication of the transmission data.
[0248]
The reception control module 1010 processes the reception data received by the communication management module 1002 via the reception queue 1004.
[0249]
The transfer service module 1012 manages a transfer service type of communication performed by the camera node 30.
[0250]
Next, FIG. 38 shows a software configuration of the sensor node 50.
[0251]
This software configuration is realized on the sensor node 50 by the CPU 142 executing a program stored in the memory 144, and performs each function described later on the sensor node 50.
[0252]
As illustrated, the software configuration of the sensor node 50 includes a network control driver 1020, a communication management module 1022, a sensor control driver 1038, a sensor control module 1036, a transmission rate management module 1034, a transfer service module 1037, a reception control module 1035, and a reception control module. It has a queue 1024, transmission queues 1026 and 1028, and an alarm transmission module 1030.
[0253]
The network control driver 1020 controls the network connection controller 140.
[0254]
The communication management module 1022 implements communication for transferring a message to a specified device via the network control driver 1020.
[0255]
The sensor control driver 1038 controls the sensor 60.
[0256]
The transmission queues 1026 and 1028 are provided corresponding to different transmission rates. The communication management module 1022 transmits the transmission data stored in each of the transmission queues 1026 and 1028 at a corresponding transmission rate.
[0257]
The transmission rate management module 1034 switches the transmission queues 1026 and 1028 for storing transmission data according to the type of transfer service used for communication of the transmission data.
[0258]
The reception control module 1035 processes the reception data received by the communication management module 1022 via the reception queue 1024.
[0259]
The sensor control module 1036 transmits an alarm message to the alarm transmission module 1030 according to the input content from the sensor 60.
[0260]
The alarm transmission module 1030 transmits an alarm message to the console processing device 20 via the transmission queues 1026 and 1028 as alarm information. The alarm message is stored in the message management table 1032.
[0261]
The transfer service module 1037 manages a transfer service type of communication performed by the sensor node 50.
[0262]
Next, FIG. 39 shows a software configuration of the bandwidth control controller node 80.
[0263]
This software configuration is realized on the band control controller node 80 by the CPU 802 executing a program stored in the memory 804, and performs each function described later on the band control controller node 80.
[0264]
As illustrated, the software configuration of the bandwidth control controller node 80 includes a network control driver 1160, a reception queue 1162, a transmission queue 1164, a network traffic monitoring module 1166, a bandwidth information translation module 1168, a bandwidth management agent module 1170, and a network management rule. It has a table 1172.
[0265]
The network control driver 1160 controls the network connection controller 806 to send and receive messages.
[0266]
The reception queue 1162 receives a message.
[0267]
The network traffic monitoring module 1166 captures the message flowing in the network 10 received by the network control driver 1160, calculates the bandwidth utilization for each transfer service type, and activates the bandwidth management agent module 1170 as necessary.
[0268]
The bandwidth information translation module 1168 translates the content of the bandwidth information table 954 transmitted from the bandwidth management manager module 960 of the console processing device 20, and describes the content in the network management rule table 1172.
[0269]
The bandwidth management agent module 1170 compares the result of the bandwidth utilization rate for each transfer service type calculated by the network traffic monitoring module 1166 with the contents of the network management rule table 1172, and, based on the comparison result, determines the communication regulation and the Control release.
[0270]
Now, also in the second embodiment, as in the first embodiment, communication is performed using three transfer service types: “bandwidth reservation transfer service”, “statistical multiplex transfer service”, and “emergency transfer service”.
[0271]
Hereinafter, a sequence in which communication according to each transfer service type is executed will be described.
[0272]
First, communication by the bandwidth reservation transfer service will be described.
[0273]
As shown in FIG. 40, in the case of performing communication using the bandwidth reservation transfer service, in the console processing device 20, an instruction to execute the band reservation transfer service by a user's selection or a predetermined user program causes communication using the band reservation transfer service. When there is a designation of a node to be performed (1400), the transfer service module 956 issues a bandwidth reservation request to the bandwidth management manager module 960 (1402). The bandwidth management manager module 960 checks whether there is a free bandwidth in the bandwidth available for communication by the bandwidth reservation transfer service (1404). Here, since the reserved bandwidth amount is managed in the bandwidth information table 954 when the instruction to execute the bandwidth reservation transfer service is issued, the bandwidth management manager module 960 checks the free bandwidth amount from this. However, at this time, as described above, the bandwidth control controller node 80 monitoring the bandwidth usage rate for each transfer service type is inquired as to whether or not there is actually a free bandwidth at that time. It may be determined whether or not there is a free band in a band available for communication by the transfer service.
[0274]
When it is clear that there is no free bandwidth, the bandwidth management manager module 960 notifies the transfer service module 956 of the fact, and the transfer service module 956 transmits the instruction to execute the bandwidth reservation transfer service. Alternatively, it notifies a predetermined user program that the execution of the bandwidth reservation transfer service has failed.
[0275]
On the other hand, if it becomes clear that there is an available bandwidth, the bandwidth management manager module 960 allocates an available bandwidth to the communication of the node instructed to execute the bandwidth reservation transfer service, and allocates the communication of this node to the bandwidth information table 954. Register with.
[0276]
Here, the contents of the band information table 954 are shown in FIG.
[0277]
As shown in the figure, communication of each node performing communication by the transfer service is registered in the band information table 954.
[0278]
In addition, the contents to be registered include a communication node indicating a transmission source node performing the communication, a transfer service type in which the communication is performed, a priority of the communication, a reserved bandwidth of the communication, and a band identifier of a band used in the communication. And
[0279]
In the transfer service type in the figure, RS indicates a band reservation transfer service, ES indicates an emergency transfer service, and SS indicates a statistical multiplex transfer service. Also, in the priority, BE indicates that the maximum bandwidth within the range allowed by the vacant bandwidth should be ensured as the bandwidth of the communication, which is equal to or less than the bandwidth registered in the reserved bandwidth, and the MN determines the other communication. Stop means that the bandwidth registered in the reserved bandwidth should be secured, and AB indicates that the bandwidth registered in the reserved bandwidth must be secured. In the reserved bandwidth, a numerical value indicates a band represented by the numerical value, ALL indicates an entire band of the network 10, and ANY indicates an arbitrary band.
[0280]
In the present embodiment, in the case of communication by the band reservation transfer service (communication of the transfer service type RS), the BE is registered as the priority and the band value allocated by the band management manager module 960 is registered as the reserved band. In the case of communication by the emergency transfer service (communication of the transfer service type ES), MN is registered as the priority and ALL is registered as the reserved band. In the case of communication by the statistical multiplex transfer service (communication of the transfer service type SS), AB is registered as the priority and ANY is registered as the reserved band.
[0281]
Now, returning to FIG. 40, if the communication of the node instructed to execute the band reservation transfer service is registered in the band information table 954, the contents of the band information table 954 are transmitted to the band control controller node 80. Is transmitted, and a bandwidth information registration request is made (1408).
[0282]
Upon receiving the bandwidth information table together with the bandwidth information registration request 1408, the bandwidth information translation module 1168 of the bandwidth control controller node 80 translates this information and updates the bandwidth of each communication so as to satisfy the contents specified in the bandwidth information table. A control rule required to perform the above control is registered in the network management rule table 1172 (1412).
[0283]
If this registration is successful, the bandwidth information translation module 1168 returns a successful bandwidth information registration request to the bandwidth management manager module 960 of the console processing device 20 (1410).
[0284]
Upon receiving the bandwidth information registration request success 1410, the bandwidth management manager module 960 notifies the transfer service module 956 of the success of the bandwidth reservation request (1412).
[0285]
Further, the transfer service module 956, according to the band information table 954, lists a node that performs communication by the band reservation transfer service, a list of communication transfer rates according to the band allocated to each communication by the band reservation transfer service, A band reservation transfer request including a list of band identifiers allocated to the communication of each node by the reservation transfer service is broadcast simultaneously (1422).
[0286]
The camera node 30 that has been instructed to transfer during the bandwidth reservation transfer request receives the request and starts image transmission to the monitor node 18 at the transfer rate specified in the bandwidth reservation transfer request (1424, 1426). The camera node 30 that has started image transmission continues image transmission until receiving the next request (1428, 1430). However, the format of the message for transmitting the image data is the same as the format used in the first embodiment (see FIG. 24 (f)), with the addition of the band identifier assigned to the communication by the band reservation transfer service of the own node. And
[0287]
Next, communication by the statistical multiplex transfer service will be described.
[0288]
In the case of performing communication by the statistical multiplex transfer service, in the console processing device 20, the instruction from the user or the execution of the statistical multiplex transfer service by a predetermined user program is specified together with the designation of the node to perform the communication by the statistical multiplex transfer service. , Via the transfer service module 956, the bandwidth management manager module 960 registers the communication of this node in the bandwidth information table 954, and sends the bandwidth information table 954 to the bandwidth control controller node 80. 954 is transmitted, and a band information registration request is made.
[0289]
Upon receiving the bandwidth information table together with the bandwidth information registration request, the bandwidth information translation module 1168 of the bandwidth control controller node 80 translates this information and updates the bandwidth of each communication so as to satisfy the content specified in the bandwidth information table. A control rule required for performing control is registered in the network management rule table 1172. If the registration is successful, the bandwidth information translation module 1168 returns a successful bandwidth information registration request to the bandwidth management manager module 960 of the console processing device 20.
[0290]
Upon receiving the success of the bandwidth information registration request, the bandwidth management manager module 960 notifies the transfer service module 956 of the success of the statistical multiplex transfer registration, and the transfer service module 956 starts the statistical multiplex transfer service for the user or a predetermined user program. return it.
[0291]
Thereafter, in the same manner as in the first embodiment (see FIG. 17), the transfer service module 956, according to the bandwidth information table 954, lists the nodes that perform communication by the statistical multiplex transfer service and the nodes by the statistical multiplex transfer service of each node. Broadcasts a statistical multiplex transfer request including a list of band identifiers assigned to the communication.
[0292]
The sensor node 50 that has been requested to perform communication by the statistical multiplex transfer service according to the statistical multiplex transfer request transfers the alarm information to the console processing device 20 at the maximum transfer rate at which the sensor 60 detects an abnormality. However, the format of the message for transmitting the alarm information is the format used in the first embodiment (see FIG. 24 (f)) with the bandwidth identifier assigned to the communication by the statistical multiplex transfer service of the own node added. And Here, the maximum transfer rate at which transfer is possible is a band that can be used by the sensor node 50 according to the protocol of the network 10.
[0293]
Next, communication by the emergency transfer service will be described.
[0294]
Now, in a state where the camera nodes 30-A and 30-B are transferring image data by communication using the band reservation transfer service, the execution of the emergency transfer service is performed by the user's selection or designation of a predetermined user program. Is requested together with the designation of the node that executes the communication by the communication module 956, the bandwidth management manager module 960 that has received the request registers the communication of this node in the bandwidth information table 954, and the bandwidth information table 954. Is transmitted to the bandwidth control controller node 80, and a bandwidth information registration request is made.
[0295]
Upon receiving the bandwidth information table together with the bandwidth information registration request, the bandwidth information translation module 1168 of the bandwidth control controller node 80 translates this information and updates the bandwidth of each communication so as to satisfy the content specified in the bandwidth information table. A control rule required for performing control is registered in the network management rule table 1172. When the registration is successful, the bandwidth information translation module 1168 returns a successful bandwidth information registration request to the bandwidth management manager module 960 of the console processing device 20.
[0296]
Upon receiving the success of the bandwidth information registration request, the bandwidth management manager module 960 notifies and notifies the transfer service module 956 of the success of the emergency transfer registration, and the transfer service module 956 notifies the user or a predetermined user program of the successful start of the emergency transfer service. return it.
[0297]
Then, similarly to the first embodiment (refer to FIG. 18), the transfer service module 956 sets a list of nodes for stopping data transfer and a list of band identifiers assigned to each communication for stopping data transfer. A node for starting communication by the emergency transfer service, a bandwidth identifier assigned to the communication by the emergency transfer service, and an emergency transfer request including designation of a transfer rate by the communication emergency transfer service are broadcast simultaneously.
[0298]
In response to the urgent transfer request, the camera node 30 instructed to stop the data transfer stops the data transfer by the communication performed by the own node, to which the band identifier for stopping the data transfer is assigned. Also, the camera node 30 instructed to transfer data by the emergency transfer service during the emergency transfer request starts transferring image data to the monitor node 18 at the transfer rate specified during the emergency transfer request. However, the format of the message for transmitting the high-definition image data is the format used in the first embodiment (see FIG. 24 (f)) with the band identifier assigned to the communication by the own node's emergency transfer service added. Shall be.
[0299]
Next, communication regulation will be described.
[0300]
In the second embodiment, as described above, the communication restriction is performed by the band control controller node 80 in accordance with the network management rule table 1172.
[0301]
Here, an example of the network management rule table 1172 is shown in FIG.
[0302]
The illustrated network management rule table 1172 corresponds to the bandwidth information table shown in FIG. 41, and controls the bandwidth of each communication so as to satisfy the content specified in the bandwidth information table created according to the bandwidth information table. The control rules necessary to perform the operation are described. Specifically, the network management rule table 1172 in FIG.
"-B-ALL (the entire bandwidth of the network) is 6.0 Mbytes (1670).
[0303]
The reserved band (RS [0] _R) for the communication of the band reserved transfer service (RS) and the identifier number 0 is 3.0 Mbytes (1674).
[0304]
The reserved band transfer service (RS), the reserved band (RS [1] _R) for the communication with the identifier number 1 is 2.0 Mbytes (1678).
[0305]
-If the current bandwidth (ES_S) of the communication of the "emergency transfer service (ES)" becomes 0 Mbyte or more, the current bandwidth (RS [0] _S) of the bandwidth reservation transfer service (RS) and the communication of the identifier number 0 is used. ) And the current band (RS [1] _S) for communication with identifier number 1 is set to 0.0 Mbyte (1682).
[0306]
-If the current bandwidth (SS_S) of the communication of the "statistical multiplex transfer service (SS)" is the sum of the bandwidth allocated to each communication of the "bandwidth reservation transfer service" from the B-ALL (all the bandwidth of the network). When the bandwidth becomes larger than the bandwidth obtained by subtracting the current bandwidth, the current bandwidth of the two communications of the “bandwidth reserved transfer service” is changed to the current bandwidth of the “statistical multiplex transfer service (SS)” in the B-ALL (the entire bandwidth of the network). SS_S) may equally divide the band not used into two (1690).
[0307]
If none of the IF conditions of 1682 and 1686 is violated, the bandwidth reservation transfer service (RS) and the current bandwidth of the identifier number 0 are set to the reserved bandwidth (RS [0] _R) of 3.0 Mbytes according to 1674 and 1678. The current band of the band reservation transfer service (RS) and the identifier number 1 is set to the reserved band (RS [1] _R) 2.0 Mbytes (1691, 1692). Is described.
[0308]
Next, FIG. 43 shows a sequence of communication regulation performed using such a control rule.
[0309]
The network monitoring module 1166 of the bandwidth controller node 80 has captured all messages flowing in the network 10 (1500). The network monitoring module 1166 is set to generate a timer interrupt in a predetermined time unit. When a timer interrupt occurs (1502), the network monitoring module 1166 calculates a bandwidth utilization rate for each transfer service type (1504). . That is, the calculation is performed in units of three transfer services “bandwidth reservation transfer service”, “statistical multiplex transfer service”, and “emergency transfer service”.
[0310]
After calculating the bandwidth utilization rate, the network monitoring module 1166 activates the bandwidth management agent module 1170 (1510).
[0311]
The bandwidth management agent module 1170 refers to the network management rule table 1172 (1524), applies the described control rule to the calculated bandwidth utilization rate for each type of transfer service, and needs to change the transfer rate of the node. Then, it is determined whether it is necessary to perform control for that (1525). If it is determined that the transfer rate is necessary, a transfer rate control message including a list of nodes for which the transfer rate is changed according to the control rule, a communication bandwidth identifier for changing the transfer rate, and a list of transfer rates after the change is transmitted. It is created with reference to the information table (1526), and the information is broadcast as a bandwidth reservation transfer request (1534). Further, it notifies the network monitoring module that the processing has been completed (1530).
[0312]
In response to the transfer rate control message, the camera node 30 instructed to change the transfer rate changes the transfer rate of the band identifier specified by the transfer rate control message to the specified transfer rate. Image transmission is started (1536, 1537). The camera node 30 that has started image transmission continues image transmission at the same transfer rate until receiving the next request (1538, 1539).
[0313]
Next, the operation of the band control controller node 80 that performs such communication regulation control will be described.
[0314]
First, FIG. 44 shows a processing procedure performed by the network monitoring module 1166.
[0315]
As shown in the figure, the network monitoring module 1166 sets the network connection controller 806 to the all reception mode (process 1600) so that all messages flowing through the network can be captured, and then inputs a timer interruption time (1602). ). The frequency of checking the state of the network is determined by the timer interrupt time. For example, if "100 ms" is input, the state of the network will be checked ten times per second.
[0316]
Once the capture of a message is started (operation 1604), the capture will continue to run until the network monitoring module 1166 is stopped.
[0317]
Thereafter, each time a message is captured, if the captured message is a bandwidth information registration request message sent by the bandwidth management manager module 960 (processing 1608), the bandwidth detection information table 954 in this message is stored in the bandwidth detection information table 954. It is transferred to the information translation module 1168 (process 1612).
[0318]
After measuring the message length of each captured message (step 1616), the message type is separated from the band identifier added to the message and the band information table (step 1620). Here, messages are classified into “bandwidth reservation transfer service (RS)”, “statistical multiplex transfer service (SS)”, “emergency transfer service (ES)”, and other service messages.
[0319]
Then, in the case of the "bandwidth reservation transfer service (RS)", the bandwidth is further classified for each band identifier, and the length of the received message is added (process 1624).
[0320]
Also, in the "statistical multiplex transfer service (SS)" and other services, the length of the received message is added (steps 1628 and 1634).
[0321]
On the other hand, in the case of the "emergency transfer service (ES)", the bandwidth usage of the emergency transfer service is not 0, and the band management agent module is immediately activated (process 1632).
[0322]
The network monitoring module 1166 performs the processing shown in FIG. 45 when a timer interrupt occurs due to the time-out of the timer set in the processing 1602.
[0323]
In this process, when a timer interrupt occurs (process 1502), the reception of the timer interrupt is stopped (process 1503) in order not to activate two or more processes. Next, it is checked whether or not the bandwidth management agent module 1170 has already been started (step 1512). If not, the message length for each transfer service type added in steps 1624, 1628, and 1634 is determined by the timer. The used bandwidth amount in units of the transfer service type, which is a value obtained by dividing by the interruption time, is calculated (process 1504). However, it is assumed that the message length for each transfer service type added in the processing 1624, the processing 1628, and the processing 1634 is initialized to 0 every time the timer expires.
[0324]
Then, the bandwidth management agent module 1170 is activated (process 1510), the timer interrupt reception is resumed (process 1516), and the process is terminated.
[0325]
The bandwidth management agent module 1170 activated in the process 1632 of FIG. 44 or the process 1501 of FIG. 45 converts the control rule described in the network management rule table 1172 into the transfer service type calculated by the network monitoring module 1166, as described above. Applying to each bandwidth utilization rate, it is necessary to change the transfer rate of the node, and it is determined whether or not it is necessary to perform control for that.If it is determined that it is necessary, the node to change the transfer rate is determined. A transfer rate control message including a list, a communication band identifier for changing the transfer rate, and a list of transfer rates after the change is created, and the information is broadcast as a band reservation transfer request. Further, it notifies the network monitoring module that the processing has been completed.
[0326]
Next, FIG. 46 shows the processing of the band information translation module 1168 activated in the processing 1612 of FIG.
[0327]
As shown in the drawing, when the bandwidth information translation module 1168 receives the bandwidth information table 954 from the network traffic monitoring module 1166 (process 1650), the bandwidth information translation module 1168 updates the bandwidth of each communication so as to satisfy the contents specified in the bandwidth information table. A control rule necessary for performing control is created (process 1654) and described in the network management rule table 1172 (process 1658).
[0328]
The operation of the bandwidth control controller node 80 has been described above.
[0329]
When the communication by the emergency transfer service is executed by the operation of the band control controller node 80 as in the first embodiment, all the communication by the other services is stopped. When the bandwidth used for communication by the statistical multiplex transfer service increases beyond the band B3 allocated to the statistical multiplex transfer service in FIG. 12, the band B2 allocated to the bandwidth reservation transfer service decreases, and the bandwidth by the statistical multiplex transfer service decreases. Communication will be performed without delay.
[0330]
As above, the second embodiment of the present invention has been described.
[0331]
In the second embodiment, instead of providing the band control controller node 80 as an independent node, the function of the band control controller node 80 is modified to be implemented in another node, for example, inside the console processing device 20. It does not matter.
[0332]
Further, in the above embodiment, the bandwidth identifier is added to the message, and from this, it is determined which communication registered in the bandwidth information table corresponds to the message captured by the bandwidth controller node 80. For example, when only one communication by one transfer service is assigned to one node, the message captured by referring to the band information table from the message transmission source node without adding the band identifier to the message is used. It may be determined which communication registered in the band information table corresponds. Further, for example, when only one communication is assigned to one node per one transfer service, a transfer service type is added to the message instead of the band identifier, and the message corresponds to the message captured from the transfer service type of the message. In addition to determining the transfer service type, it is also possible to determine which communication registered in the band information table corresponds to the captured message by referring to the band information table based on the message source node and the transfer service type. Good.
[0333]
As described above, according to the second embodiment, in addition to the effect of the first embodiment, by directly observing the network usage status in units of the transfer service, each network transfer service can be more accurately and in detail. Since the traffic of each node is grasped and each communication is controlled, it is possible to appropriately and finely control the band used by the communication of each node.
[0334]
In the second embodiment, the bandwidth is controlled in units of transfer services such as a band reservation transfer service, a statistical multiplex transfer service, and an emergency transfer service. The configuration of the second embodiment for controlling the bandwidth is similar to the control of the bandwidth for each unit of the application corresponding to the message, the source address, the destination address, the protocol, the transport number, or other communication attributes. Can be applied.
[0335]
【The invention's effect】
As described above, according to the present invention, in a monitoring system in which communication of information whose generation rate is uniform in time and communication of information whose generation rate is not uniform in time coexist, important information that needs to be urgent to some extent is The bandwidth can be used more effectively without delaying communication.
[0336]
Further, according to the present invention, it is possible to prevent delay or loss of communication of important information communicated on the monitoring system.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a video surveillance system according to a first embodiment of the present invention.
FIG. 2 is a block diagram illustrating a hardware configuration of a console processing device according to the first embodiment of the present invention.
FIG. 3 is a block diagram illustrating a hardware configuration of a monitor node according to the first embodiment of the present invention.
FIG. 4 is a block diagram illustrating a hardware configuration of a camera node according to the first embodiment of the present invention.
FIG. 5 is a block diagram illustrating a hardware configuration of a sensor node according to the first embodiment of the present invention.
FIG. 6 is a block diagram illustrating a software configuration of the console processing device according to the first embodiment of the present invention.
FIG. 7 is a block diagram illustrating a software configuration of a monitor node according to the first embodiment of the present invention.
FIG. 8 is a block diagram illustrating a software configuration of the camera node according to the first embodiment of the present invention.
FIG. 9 is a block diagram illustrating a software configuration of the sensor node according to the first embodiment of the present invention.
FIG. 10 is a diagram showing a state of data transfer performed by the monitoring system according to the first embodiment of the present invention.
FIG. 11 is a diagram showing a state of data transfer performed by the monitoring system according to the embodiment of the present finding.
FIG. 12 is a diagram illustrating a state of band distribution according to the first embodiment of the present invention.
FIG. 13 is a diagram showing a state of band distribution according to the first embodiment of the present invention.
FIG. 14 is a diagram illustrating a state of band distribution according to the first embodiment of the present invention.
FIG. 15 is a diagram illustrating a state of band distribution according to the first embodiment of the present invention.
FIG. 16 is a diagram showing a communication sequence by the bandwidth reservation transfer service according to the first embodiment of the present invention.
FIG. 17 is a diagram illustrating an example of a communication sequence by the statistical multiplex transfer service according to the first embodiment of the present invention.
FIG. 18 is a diagram illustrating an example of a communication sequence by the emergency transfer service according to the first embodiment of the present invention.
FIG. 19 is a diagram showing a communication restriction sequence according to the first embodiment of the present invention.
FIG. 20 is a diagram showing a communication restriction sequence according to the first embodiment of the present invention.
FIG. 21 is a diagram showing a sequence of communication restriction release according to the first embodiment of the present invention.
FIG. 22 is a diagram showing a sequence of communication restriction release according to the first embodiment of the present invention.
FIG. 23 is a diagram showing a configuration of a band information table according to the first embodiment of the present invention.
FIG. 24 is a diagram showing a format of communication data used in the first embodiment of the present invention.
FIG. 25 is a flowchart illustrating a process performed by the bandwidth management manager module according to the first embodiment of the present invention.
FIG. 26 is a flowchart illustrating processing performed by a transfer service module of the camera node according to the first embodiment of the present invention.
FIG. 27 is a flowchart illustrating processing performed by a transfer service module of the camera node according to the first embodiment of the present invention.
FIG. 28 is a flowchart illustrating processing of a camera control module of a camera node according to the first embodiment of the present invention.
FIG. 29 is a flowchart illustrating processing of a reception control module of the monitor node according to the first embodiment of the present invention.
FIG. 30 is a flowchart showing processing of a communication quality observation module of a monitor node according to the first embodiment of the present invention.
FIG. 31 is a diagram showing a modification of the communication sequence by the bandwidth reservation transfer service according to the first embodiment of the present invention.
FIG. 32 is a diagram illustrating a modification of the format of communication data used in the first embodiment of the present invention.
FIG. 33 is a block diagram illustrating a configuration of a video monitoring system according to a second embodiment of the present invention.
FIG. 34 is a diagram illustrating a hardware configuration of a bandwidth control controller node according to the second embodiment of the present invention.
FIG. 35 is a diagram showing a software configuration of a console processing device according to the second embodiment of the present invention.
FIG. 36 is a diagram showing a software configuration of a monitor node according to the second embodiment of the present invention.
FIG. 37 is a diagram illustrating a software configuration of a camera node 30 according to the second embodiment of the present invention.
FIG. 38 is a diagram illustrating a software configuration of a sensor node according to the second embodiment of the present invention.
FIG. 39 is a diagram illustrating a software configuration of a bandwidth control controller node according to the second embodiment of the present invention.
FIG. 40 is a diagram showing a communication sequence by the bandwidth reservation transfer service according to the second embodiment of the present invention.
FIG. 41 is a diagram showing a band information table according to the second embodiment of the present invention.
FIG. 42 is a diagram showing a network management rule table according to the second embodiment of the present invention.
FIG. 43 is a diagram showing a sequence for realizing communication restriction according to the second embodiment of the present invention.
FIG. 44 is a flowchart showing processing of the network monitoring module according to the second embodiment of the present invention.
FIG. 45 is a flowchart showing processing of the network monitoring module according to the second embodiment of the present invention.
FIG. 46 is a flowchart showing processing of a band information translation module according to the second embodiment of the present invention.
[Explanation of symbols]
Reference numeral 10: network, 12: user, 14: output device, 20: console processing device, 16: monitor, 18: monitor node, 22: keyboard, 24 ... Mouse, 30 camera node, 40 camera, 50 sensor node, 60 sensor, 80 bandwidth control controller node, 150 input / output device control driver, 152 A GUI control module, 156 a transfer service module, 160 a bandwidth management manager module, 154 a bandwidth information table, 182 a communication quality management module, 184 a monitor control module, 216 ..Camera control module, 236... Sensor control module, 332... Band identifier area, 334. A, 336: regulated bandwidth area, 338: maximum transmission rate area, 340: regulated transmission rate area, 342: used transmission rate area, 350: communication data format, 352 ... Transaction code area, 354: source address, 356: destination address, 358: message data length, 360: message data

Claims (10)

Data is transferred via a network between a node that captures the status of the monitoring target, an output node that outputs information indicating the status of the monitoring target, and a control node that controls the input node and the output node. A monitoring system,
Prior to transfer of the first type of data, which is data to be transferred uniformly over time, the control node determines the total transmission capacity used for the transfer of the first type of data as the total transmission capacity of the network. The transmission capacity to be used for the first type of data transfer to be started is determined so as to be smaller than the predetermined amount, and the transfer capacity for the second type of data to be transferred unevenly in time is determined. On the other hand, without assigning the transmission capacity used for the transfer,
An input node, an output node, or a control node that transfers the first type of data transfers data at a transfer rate according to a transmission capacity allocated to the transfer;
A monitoring system, wherein an input node, an output node, or a control node that transfers the second type of data transfers data at a transfer rate according to an available transmission capacity of a network. The monitoring system according to claim 1, wherein
When the control node is instructed to give priority to a specific transfer, the input node, the output node, or the control node performing the transfer of the first type of data other than the specific transfer, or Instructing the input node, output node or control node that is transferring the second type of data other than the specific transfer to stop the transfer,
A monitoring system, wherein an input node, an output node, or a control node instructed to stop the transfer increases the transfer rate of the specific transfer by stopping the transfer instructed to be stopped. The monitoring system according to claim 2, wherein
The specific transfer is a transfer of the first type of data,
The control node reassigns the transmission capacity to the specific transfer so that the assigned transmission capacity increases,
A monitoring system, wherein the input node, output node, or control node performing the specific transfer transfers data at a transfer rate according to the reallocated transmission capacity. A monitoring system that transfers data via a network between an input node that captures a state of a monitoring target and an output node that outputs information indicating the state of the monitoring target,
When the traffic of the network increases by a predetermined level or more, the transfer of the first type of data is performed such that the transfer rate of the transfer of the first type of data performed through the network is reduced. Having control means for controlling the input node or output node that is performing,
The input node or the output node that is transferring the first type of data reduces the transfer rate of the transfer in accordance with the control of the control unit, so that the second type differs from the first type. A monitoring system for maintaining or increasing the transfer rate of data transfer of the following types: The monitoring system according to claim 4, wherein
The control unit controls the input node or the output node that is transferring the first type of data so that the transfer rate of the transfer of the first type of data is reduced, and then controls the network. Control the input node or output node performing the transfer of the first type of data so that the transfer rate of the transfer of the first type of data is increased when the traffic of the first type is reduced by a predetermined level or more. And
A monitoring system, wherein an input node or an output node that is transferring the first type of data increases a transfer rate of the transfer under the control of the control unit. A network system having a communication node performing communication classified into any of a plurality of communication types via a network, and a control node connected to the network,
The control node comprises:
Storage means for storing, for each communication type, a condition table describing conditions to be satisfied by a band used by a network used for communication of the communication type;
Detecting means for detecting the used band of the network used by each communication for each communication type,
When the detected use band for each communication type does not satisfy the condition described in the condition table, the communication node is changed via the network to change the band used for communication so that the condition is satisfied. A network system, comprising: a control unit for controlling the network system. The network system according to claim 6, wherein
The condition of any one of the communication types described in the condition table stored in the storage unit includes a condition to be satisfied in relation to a band used by a network used for communication of another communication type. A network system characterized by the following. The network system according to claim 6, wherein:
A network system for detecting, for each communication type, a band used by each communication by measuring communication data transferred on the network for each communication type; . A network system comprising: a communication node that performs communication classified into one of a first communication type and a second communication type via a network; and a control node connected to the network,
The control node comprises:
Storage means for storing a band information table describing a band allocated to communication of the first communication type;
Detecting means for measuring communication data flowing on the network and detecting a band used by the network used by the communication of the second communication type;
The detected use band of the second communication type is changed from the band of the network that can be used for the communication of the first communication type and the second communication type to the first communication type described in the band information table. Control for controlling, via the network, a communication node performing communication of the first communication type so as to reduce the band used for communication of the first communication type when the value exceeds the value obtained by subtracting the allocated bandwidth. And a network system. A network system comprising: a communication node that performs communication classified into one of a first communication type and a second communication type via a network; and a control node connected to the network,
The control node comprises:
Detecting means for measuring communication data flowing on the network and detecting that communication of the second communication type is occurring;
When it is detected that the communication of the second communication type is occurring, the communication node performing the communication of the first communication type is connected to the network so that the communication of the first communication type is stopped. And control means for controlling the network system via the network.

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