JP2004253989A - Network qos control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem that, in a network constituted by a repeater multistage-connected, a QoS (quality of service) control system has to use a special data form so as to solve an increase in delay time by internal delay of the repeater and traffic increases by communication other than data for executing the QoS control. <P>SOLUTION: This network QoS control system has: a means for defining a maximum period for data relay processing in the plurality of repeaters by using stage numbers of the repeaters to the receiver in a network, to which a transmitter, a receiver and a plurality of repeaters are connected; and a means for transmitting data from the repeaters within the maximum period, and controls the delay time of data communication via the plurality of repeaters. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a network QoS control system.
[0002]
[Prior art]
Generally, in a network such as a LAN using Ethernet (R), a repeater or a hub device is used as a repeater. Transmitters and receivers are often connected in star fashion to these repeaters. On the other hand, in the case of a cascade connection as shown in FIG. 1, a delay due to internal processing occurs each time data passes through a repeater, and a delay time is accumulated when passing data through a plurality of repeaters. The total delay time to the device increases in proportion to the number of stages. For this reason, in the cascade connection, it is desirable to suppress the number of repeaters to four or less.
[0003]
The delay and fluctuation of data communication on the network greatly affect the quality of communication service. For example, if the communication of voice data from the transmitting side to the receiving side in telephone communication is greatly delayed or the delay time fluctuates greatly, the possibility of voice interruption is increased, so that the function as a telephone service can be performed. Can not. As described above, how to guarantee the quality of service (QoS) and how to control communication delay are major issues in network design. Therefore, various QoS control systems have been conventionally devised.
[0004]
For example, QoS control using priority is used, and FIGS. 19, 20, 21 and 22 show a conventional QoS control system using priority. FIG. 20 shows a network in which the transmitter 10 and the receivers 30 to 34 are connected in a star configuration to two repeaters 120 and 121. In order to perform QoS control by priority in a network as shown in FIG. 20, priority information is added to communication data. For example, as shown in FIG. 22, when priority information is required for a normal communication data format 210 used in the Internet or the like, the format of the communication data 211 in which the priority information is embedded is used. When there are three levels of priority of this data format, for example, three levels of high, medium, and low, communication data 200, 201, and 202 having each level of priority are communicated on the network as shown in FIG. become.
[0005]
Now, QoS control based on priority using the repeater 120 in FIG. 19 will be described. First, when the communication data 200 to 202 from the transmitter 10 is stored in the input buffer 140, the buffer management unit 150 refers to the communication data 200 to 202, and the priority determination unit 151 determines the priority of the communication data. . Next, the buffer management unit 150 stores the communication data 200 to 202 in three priority queues of a high-priority queue 170, a medium-priority queue 171 and a low-priority queue 172, respectively.
[0006]
Next, the output unit 180, which has received the instruction of the control unit 160, extracts the communication data 200 to 202 from the priority-specific queues in the order of higher priority and sends them to the network. In this way, the repeaters 120 and 121 in FIG. 20 use the data storage queue for each priority and preferentially transmit communication data having a higher priority than a lower priority. Priority processing based on the difference is performed, and QoS control based on the priority is performed.
[0007]
However, when the QoS control system described above is applied, the transmitter 10 capable of generating the communication data 211 to which the priority information different from the normal data format 210 is added, the receivers 30 to 34 capable of receiving the communication data, and Repeaters 120 and 121 capable of performing QoS control processing based on priority are required.
[0008]
In addition, the communication data 211 in a format different from the normal format 210 cannot be processed by the normal repeater because the priority information is added, and the data may be discarded internally. Processing, that is, a phenomenon that communication cannot be performed occurs.
[0009]
As described above, in the conventional network QoS control system using the priority information, since a special data format is used, a problem that communication in a normal format cannot be performed occurs.
[0010]
When performing QoS control on communication data in a normal format, there is a method of separately performing data communication for QoS control in order to secure and guarantee a communication band of a network. However, in these methods, data communication for control and its mechanism are separately required for performing data communication, and there is a problem that QoS control becomes complicated, for example, considering the influence of the communication traffic on the communication band.
[0011]
[Patent Document 1]
JP 2001-69166 A
[0012]
[Problems to be solved by the invention]
As described above, the conventional network QoS control system has a disadvantage that QoS control for communication data of a normal format may not be performed in a network including multi-stage connected repeaters.
[0013]
In view of the above, an object of the present invention is to provide a network QoS control system capable of coping with normal-format communication data for a network having a repeater configuration connected in multiple stages.
[0014]
[Means for Solving the Problems]
In order to solve this problem, a network QoS control system according to the first aspect of the present invention is configured such that a transmitter, a receiver, and a plurality of repeaters are connected to each other in a network. And means for specifying the maximum time for data relay processing in each of said repeaters using the number of stages of said repeaters up to and means for transmitting data from said repeaters within said maximum time.
[0015]
Further, in the network QoS control system according to the second invention of the present application, in a network in which a transmitter, a receiver, and a plurality of repeaters are connected, the repeater from each repeater to the receiver is connected. Means for specifying the maximum time for data relay processing in each of the repeaters using the number of stages, and means for transmitting data from the repeaters within the maximum time.
[0016]
The network QoS control system according to claim 3 is defined by using the number of stages of the repeaters from the transmitter to the receiver in a network in which a transmitter, a receiver, and a plurality of repeaters are connected. The maximum time of data relay processing in each of the repeaters is compared with the maximum time of data relay processing in each of the repeaters defined using the number of stages of the relays from each of the relays to the receiver. And means for transmitting data from the repeater within a smaller maximum time.
[0017]
A network QoS control system according to a third aspect of the present invention is configured to determine a maximum time for data relay processing in the relay based on the number of stages of the relay and data traffic passing through the relay. To change.
[0018]
A network QoS control system according to a fourth aspect of the present invention is characterized in that the maximum time for data relay processing in the repeater is based on the number of stages of the repeater in the network and priority information of communication data. Is to change.
[0019]
Further, in the network QoS control system according to the fifth aspect of the present invention, in a network in which a transmitter, a receiver, and a plurality of repeaters are connected, the network QoS control system is configured to transmit the repeater from the transmitter to the receiver. It has means for determining the priority of communication data using the number of stages, defining a maximum time for data relay processing in each of the relays, and means for transmitting data from the relay within the maximum time.
[0020]
In the network QoS control system according to a fifth aspect of the present invention, in the network in which a transmitter, a receiver, and a plurality of repeaters are connected, the repeater from each of the repeaters to the receiver is connected. Determines the priority for communication data using the number of stages, means for defining the maximum time of data relay processing in each said repeater, and means for sending data from each said repeater within said maximum time is there.
[0021]
In the network QoS control system according to claim 8, in a network in which a transmitter, a receiver, and a plurality of repeaters are connected, a communication determined by the number of stages of the repeaters from the transmitter to the receiver. It is defined by the maximum time of data relay processing in each of the repeaters defined from the priority of data and the priority of communication data determined by the number of stages of the repeater from each of the repeaters to the receiver. A means for comparing the maximum time of the data relay processing in each of the repeaters and transmitting data from the repeater within a smaller maximum time.
[0022]
The network QoS control system according to claim 9, wherein the data relay in the repeater is performed based on a priority of communication data determined from the number of stages of the repeater in the network and a data communication amount passing through the repeater. This is to change the maximum processing time.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
(Embodiment 1)
FIGS. 1, 2, 3, 4, 5, 6, and 7 show an embodiment using the network QoS control system according to the first aspect of the present invention. It is.
[0024]
FIG. 1 shows a network configuration in which a transmitter 10 and a receiver 30 are connected to a plurality of cascaded repeaters 20, 21 to 23. When performing data communication in such a network, since there are multiple stages of repeaters (four stages in FIG. 1) between the transmitter and the receiver, the delay time in the internal processing of each repeater is one unit. Then, when the number of stages of the repeater is N, the delay time becomes N units. As described above, the delay time in the data communication from the transmitter to the receiver increases in proportion to the number of cascaded repeaters (FIG. 2).
[0025]
Therefore, a QoS control system based on the number of repeaters in a network configuration in which middle devices are cascaded in multiple stages will be described with reference to the processing flow of FIG.
[0026]
First, when the communication data 100 is transmitted from the transmitter 10 to the receiver 30 in the network of FIG. 1, the communication data 100 is received by the repeater 20 of FIG.
[0027]
Next, the control unit 60 instructs the buffer management unit 50 to compare the number of stages of the communication data 100. The buffer management unit 50 refers to the communication data 100, issues an instruction to the stage number processing unit 90, and calculates the number of stages of the repeater for the communication data 100 (S11). For example, when the communication data format 210 of FIG. 22 is used and the network addresses of the transmitter, the repeater, and the receiver are assigned as shown in FIG. 3, the transmission source address of the transmitter and the reception destination address of the receiver are Using the information, the number of stages of the repeater can be determined. In FIG. 3, the transmitter 10 connected to the repeater # 1 relays the address of 192.168.1.1, the receiver 30 connected to the relay # 4 relays the address of 192.168.4.1. Units # 1 to # 4 have addresses of 192.168.1.0 to 192.168.4.0, that is, 192.168.1.0. n. Since it has an address of 0 (n = 1 to 4), the number of stages between the transmitter 10 and the receiver 30 is four.
[0028]
Next, using the number of stages of the repeater from the transmitter to the receiver, a level of control by the number of stages is provided in order to control the processing time from data reception to transmission in the repeater, that is, the delay time of the relay process. . FIG. 4A shows a case where three control levels are provided, where three or more stages are high levels, two or more stages are medium levels, and one or more levels are low levels. Also, as shown in FIG. 4B, the maximum delay time of the relay processing at each control level is defined as 1/3 unit at the high level, 2/3 unit at the medium level, and 1 unit at the low level.
[0029]
The buffer management unit 50 compares the number of stages of the repeater between the transmitter and the receiver with the number of high-level stages 3 (S12), and stores the communication data in the high-level queue 70 when the number of stages is 3 or more (S16). ). If the number of stages is less than 3, the number of stages of the repeater between the transmitter and the receiver is compared with the number of middle-level stages 2 (S13). If the number of stages is 2 or more, the communication data is stored in the middle-level queue 71. It is stored (S17). If the number of stages is less than 2, the communication data is stored in the low-level queue 72 (S14). In this way, communication data is stored in three levels of queues according to the number of stages.
[0030]
Next, the control unit 60 issues an instruction to the output unit 80, retrieves communication data from the queue of each level within the maximum delay time of each level, and sends it to the network according to the level of the level (S15).
[0031]
In the data communication from the transmitter 10 to the receiver 30, the number of stages of the repeaters is 4, and therefore, the communication data is stored in the high-level queues in the repeaters # 1 to # 4 from FIG. Data is sent within the unit time. As a result, as shown in FIG. 7, the total sum of the maximum delay time in each repeater is 4/3 unit time, which is about 33% of the delay time compared to 4 unit time without QoS control as shown in FIG. Be shortened.
[0032]
In this way, by using the method of defining and controlling the delay time for each level by the number of stages from the transmitter to the receiver in each of the repeaters 20 to 23, communication data having a large number of stages of the repeater is converted into communication data having a small number of stages. QoS control is performed so as to be transmitted within a shorter time.
[0033]
As described above, according to the present embodiment, the QoS control system using the number of stages of the repeaters of the network allows the network to have a large number of stages of the repeaters of the transmitter and the receiver, that is, the network in which the communication delay time is increased. In the configuration, the delay time can be greatly reduced.
[0034]
(Embodiment 2)
FIGS. 8, 9 and 10 are diagrams showing an embodiment using the network QoS control system according to the second aspect of the present invention.
[0035]
Hereinafter, a QoS control system in the case where the repeater 24 of FIG. 8 is used in place of the repeater 20 in the network of FIG. 1 will be described.
[0036]
First, communication data 100 from the transmitter 10 to the receiver 30 is stored in the input buffer 40 of the repeater 24.
[0037]
Next, the control unit 60 instructs the buffer management unit 51 to compare the number of stages of the communication data 100. Then, the buffer management unit 51 refers to the communication data 100, issues an instruction to the stage number processing unit 91, and calculates the number of stages of the communication data 100. The number-of-stages processing unit 91 calculates the number of stages of the repeater from the repeater 24 to the receiver 30 using the network address of the repeater 24 and the source address of the transmitter obtained from the unique information management unit 92 (S21). .
[0038]
Next, the control unit 60 controls the delay time inside the repeater using the number of repeaters from the repeater 24 to the receiver 30 as shown in FIG. The buffer management unit 51 compares the number of stages of the repeaters from the repeater 24 to the receiver 30 with the number of high-level stages 3 (S22), and stores the communication data in the high-level queue 70 when the number of stages is 3 or more (S26). ). If the number of stages is less than 3, the number of stages in the repeater is compared with the number of intermediate-level stages 2 (S23). If the number of stages is 2 or more, communication data is stored in the intermediate-level queue 71 (S27). On the other hand, if the number of stages is less than 2, the communication data is stored in the lower-level queue 72 (S24). In this manner, communication data is stored in three levels of queues according to the number of stages of the repeater from the repeater 24 to the receiver 30.
[0039]
Next, in the same manner as in the first embodiment, the control unit 60 issues an instruction to the output unit 80, extracts communication data from the queue of each level within the maximum delay time of each level, and outputs the communication data to the network, as in the first embodiment. (S25).
[0040]
When such a method is used, the data communication from the transmitter 10 to the receiver 30 is performed in a high-level queue with four stages in the repeater # 1 and three stages in the repeater # 2. As shown in FIG. 9, data is transmitted within 1/3 unit time. On the other hand, in the repeater # 3, the number of stages becomes 2, and the data is stored in the middle-level queue, so that the data is transmitted within the time of 2/3 unit. Further, in the repeater # 4, the number of stages becomes 1, and the data is stored in the low-level queue, so that data is transmitted within one unit of time. As a result, as shown in FIG. 9, the total sum of the maximum delay time in each repeater is a time corresponding to 7/3 unit, which is about 58% of the delay time in comparison with 4 units in FIG. 2 where QoS control is not performed. Be shortened.
[0041]
In this way, by using the number of stages from each repeater to the receiver in each repeater and by defining and controlling the delay time for each level, communication data having a large number of stages from each repeater to the receiver can be reduced by the number of stages. QoS control is performed such that data is transmitted in a shorter time than small communication data.
[0042]
As described above, according to this embodiment, the QoS control system using the number of stages from each repeater to the receiver in the network can reduce the delay time in a network configuration in which there are many repeaters and the communication delay time is large. Can be.
[0043]
The delay time according to the number of stages from each repeater to the receiver described here is compared with the delay time according to the number of stages of the repeater from the transmitter to the receiver described in the first embodiment. It is also conceivable to apply a control method.
[0044]
(Embodiment 3)
FIGS. 11, 12, 13, and 14 are diagrams showing an embodiment using the network QoS control system according to the third aspect of the present invention.
[0045]
FIG. 11 shows a network configuration in which one receiver 31 to 33, 30 is connected to each of the cascaded repeaters 25 to 27, 28.
[0046]
In the case of performing data communication from the transmitter 10 to each of the receivers 31 to 33 and 30 in the network of FIG. 11, the QoS using the number of stages of the repeaters from each repeater to each receiver described in the second embodiment is used. When the control system is applied, as shown in FIG. 13A, the delay time of communication data increases as the number of stages of the repeaters from the transmitter increases.
[0047]
Therefore, a method of controlling the maximum delay time using the amount of communication data passing through the repeater will be described with reference to FIGS. 12, 13 and 14. Processes such as input of communication data, calculation of the number of stages of the repeater, and storage in the queue are the same as those in the second embodiment, and different processes will be mainly described.
[0048]
The buffer management unit 52 of FIG. 14 notifies the traffic management unit 53 each time communication data is received in the input buffer. The traffic management unit 53 calculates and holds the traffic per unit time (S31).
[0049]
Next, the output unit 81 determines the maximum delay time via the control unit 60 and the buffer management unit 52, referring to the communication amount calculated by the communication amount management unit 53 according to the processing flow of FIG.
[0050]
When two or more communication data are input into the repeater (S32), the maximum delay time is not changed. For example, in FIG. 13A, when the processing time is between 0 and 1/3 unit, three communication data are input to the repeater # 1, so that the maximum delay time for each level is not changed. On the other hand, when only one communication data is input, for example, when the processing time of FIG. 13A is between 2/3 and 1 unit, only one communication data is input to the repeater # 3. ), The maximum delay time is reduced to 1/3 unit (S33). Further, when the processing time in FIG. 13A is between 1 and 4/3 units, since only one communication data is input to each of the repeaters # 2, # 3, and # 4, as shown in FIG. The maximum delay time is reduced to 1/3 unit (S33).
[0051]
Then, within the changed maximum delay time, the output unit 81 extracts communication data from the queue of each level and outputs it (S34).
[0052]
When the QoS control system that sets and changes the maximum delay time based on the amount of data communication is used, the total delay time of communication data with respect to each of the receivers 31 to 33 and 30 is reduced as illustrated in FIG. Compared with the case of (A), it is possible to shorten uniformly.
[0053]
As described above, according to the present embodiment, the QoS control system that uses the number of stages from each repeater to the receiver of the network and changes the maximum delay time according to the communication amount allows communication via a plurality of repeaters. Delay time can be reduced for data communication in which delay time increases. Note that the delay time is similarly reduced when the number of stages from the transmitter to the receiver in the network is used.
[0054]
(Embodiment 4)
FIGS. 15, 16, and 17 are diagrams showing an embodiment using the network QoS control system according to the fourth aspect of the present invention.
[0055]
As described in Embodiment 3, when data communication is performed from the transmitter 10 to each of the receivers 31 to 33 and 30 in the cascade connection type network of FIG. 11, each relay is performed as shown in FIG. The delay time of communication data in the receiver differs for each receiver, and increases as the number of repeaters increases.
[0056]
Therefore, in the configuration using the repeater 29 of FIG. 15 instead of the repeaters 25 to 28 of FIG. 11, the maximum delay time using the number of repeaters from each repeater to the receiver and the priority information of the communication data. Will be described according to the processing flow of FIG. Here, processes such as data input, calculation of the number of stages of the repeater, and storage in the queue are the same as those in the second embodiment, and different processes will be mainly described.
[0057]
First, when the communication data 200 is received in the input buffer 40 by the repeater 29 of FIG. 15, the buffer management unit 52 passes the communication data 200 to the priority determination unit 54 and determines the priority (S40). If the communication data does not include the priority information, the QoS control based on the number of stages is applied as in the second embodiment (S46), and the communication data is stored in the queue of each level. On the other hand, if the communication data includes the priority information, the buffer management unit 52 compares the priority with the number of stages of the repeater (S41). If the priority is lower than the number of stages (S42), QoS control based on the number of stages is applied (S46). If the priority is at a level higher than the number of stages (S43), the priority is determined, and if the priority is high, the priority is stored in the higher queue (S47). In the case of medium priority (S44), it is stored in the middle queue (S48). If the priority is low, the data is stored in the low queue (S45). Then, a delay time corresponding to each level is set.
[0058]
For example, when the number of stages from the repeater to the receiver is used, the communication data 200 from the transmitter 10 to the receiver 30 has two stages in the repeater # 3, and the processing time in FIG. The three units are stored in the middle level queue 72 as shown by the dotted line, and the maximum delay time is set to 2/3 units. However, if the priority of the communication data 200 is high, the communication data 200 is stored in the high-level queue 73, and the maximum delay time is shortened and set to 1/3 unit as indicated by the solid line.
[0059]
Similarly, the number of stages in repeater # 4 is 1, and when the processing time is between 4/3 and 7/3 units, it is stored in the low-level queue of repeater # 4 as indicated by the dotted line in FIG. The time is set to one unit. However, when the priority of the communication data 200 is high, the communication data 200 is stored in the high-level queue 73, and the maximum delay time is set to be shortened to 1/3 unit as indicated by the solid line.
[0060]
Finally, in response to an instruction from the control unit 60, the output unit 81 extracts the communication data 200 from the queue of each level and outputs the communication data 200 within the maximum delay time (S49).
[0061]
By using the QoS control system that changes the maximum delay time based on the number of stages of the repeater 29 and the priority of the communication data 200 in this manner, compared to the case of FIG. The total repeater delay time can be reduced from 7/3 units to 4/3 units.
[0062]
As described above, according to the present embodiment, the QoS control system that uses the number of stages from each repeater to the receiver of the network and changes the maximum delay time according to the priority information of the communication data passes through a plurality of repeaters. Therefore, it is possible to reduce the delay time for data communication in which the communication delay time increases. Note that the delay time is similarly reduced when the number of stages from the transmitter to the receiver in the network is used.
[0063]
(Embodiment 5)
A method of controlling a maximum delay time for determining priority information of communication data using the number of repeaters in an embodiment using a network QoS control system according to a fifth invention of the present application described in claim 6 of the present invention Will be described according to the processing flow of FIG. In the network in which the repeaters 25 to 28 in FIG. 11 are replaced by the repeater 29 in FIG. 15, the data input, the calculation of the number of stages of the repeaters (S51), the setting of the maximum delay time, etc. And
[0064]
The control unit 60 in FIG. 15 controls the delay time inside the repeater by replacing the priority with the number of stages of the repeater 29. First, the buffer management unit 52 compares the number of stages of the repeater from the transmitter to the receiver with the higher priority level value 3 (S52). If the number of stages is 3 or more, the priority is set to the high priority and the communication data is set to the higher priority. It is stored in the level queue 73 (S56). If the number of stages is less than the value 3 of the high priority, the number of stages of the repeater is compared with the medium level value 2 of the priority (S53). If the number of stages is equal to or more than the medium level value 2, the priority is changed to the medium priority. Is stored in the middle-level queue 74 (S57). If the number of stages is less than the middle level value 2, the priority is set to the low priority and the communication data is stored in the low-level queue 75 (S54). In this way, the priority is determined using the number of stages of the repeater from the repeater to the receiver, and the communication data is stored in the three-level queue.
[0065]
Then, the control unit 60 issues an instruction to the output unit 82, extracts communication data from the queue of each level within the maximum delay time corresponding to each level, and sends it to the network (S55).
[0066]
For example, in the case of communication data from the transmitter 10 to the receiver 30 in FIG. 11, the number of stages of the repeater 29 is four, so that in each of the repeaters # 1 to # 4, the communication data And transmitted within a delay time of 1/3 unit as shown in FIG.
[0067]
In this way, the priority of the communication data is determined using the number of stages of the repeaters from the transmitter to the receiver, and the method of defining and controlling the delay time for each level, the QoS control is performed to shorten the transmission time for large communication data.
[0068]
Also, when the number of stages from each repeater to the receiver is used as the number of stages of the repeater, the same QoS control can be performed.
[0069]
As described above, according to the present embodiment, the internal delay time of the network repeater can be reduced by the QoS control system that determines the priority of communication data using the number of stages of the network repeater.
[0070]
In this QoS control system, the priority based on the number of stages from the transmitter to the receiver and the priority based on the number of stages from each repeater to the receiver are compared to select a priority with a smaller delay time, Even when the priority is changed according to the amount of data communication passing through the repeater, the delay time can be similarly reduced.
[0071]
【The invention's effect】
As described above, according to the present invention, a QoS control system using the number of repeaters in a network can reduce the delay time of a plurality of repeaters without changing the communication data format.
[Brief description of the drawings]
FIG. 1 is a block diagram of a network configuration according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing a processing time inside the repeater according to the first embodiment of the present invention.
FIG. 3 is a diagram showing a network address according to the first embodiment of the present invention;
FIG. 4 is a diagram showing the number of stages and the processing time of the repeater according to the first embodiment of the present invention;
FIG. 5 is a block diagram showing a configuration of a repeater according to the first embodiment of the present invention.
FIG. 6 is a diagram showing a processing flow according to the first embodiment of the present invention;
FIG. 7 is a diagram showing a processing time of each repeater according to the first embodiment of the present invention.
FIG. 8 is a block diagram showing a configuration of a repeater according to a second embodiment of the present invention.
FIG. 9 is a diagram showing a processing time of each repeater according to the second embodiment of the present invention.
FIG. 10 is a diagram showing a processing flow of a QoS control system according to the second embodiment of the present invention.
FIG. 11 is a block diagram of a network configuration according to a third embodiment of the present invention.
FIG. 12 is a diagram showing a processing flow of a QoS control system according to the third embodiment of the present invention.
FIG. 13 is a diagram showing a processing time of each repeater according to the third embodiment of the present invention.
FIG. 14 is a diagram showing a block configuration of a repeater according to a third embodiment of the present invention.
FIG. 15 is a diagram showing a block configuration of a repeater according to a fourth embodiment of the present invention.
FIG. 16 is a diagram showing a processing time of each repeater according to the fourth embodiment of the present invention.
FIG. 17 is a diagram showing a processing flow of the QoS control system according to the fourth embodiment of the present invention.
FIG. 18 is a diagram showing a processing flow of the QoS control system according to the fifth embodiment of the present invention.
FIG. 19 is a diagram showing a block configuration of a repeater of a conventional QoS control system.
FIG. 20 is a block diagram of a conventional general network configuration.
FIG. 21 is a diagram showing communication data having priority information.
FIG. 22 is a diagram showing a communication data format.
[Explanation of symbols]
10 transmitter
20,21,22,23,24 Repeater
25,26,27,28,29 Repeater
30, 31, 32, 33, 34 receiver
40 input buffer
50, 51, 52 buffer management unit
53 Traffic management unit
54 Priority judgment unit
60 control unit
70,73 High queue
71,74 Medium queue
72,75 low queue
80, 81, 82 output unit
90, 91 stage number processing unit
92 Unique information management unit
100, 101, 102 Communication data
120, 121 repeater
140 input buffer
150 Buffer management unit
151 Priority judgment unit
160 control unit
170 High priority queue
171 Medium priority queue
172 Low priority queue
180 output unit
200 Low priority communication data
201 Medium priority communication data
202 High priority communication data
210, 211 Communication data format

Claims (9)

In a network in which a transmitter, a receiver, and a plurality of repeaters are connected, means for defining a maximum time of data relay processing in each of the repeaters using the number of stages of the repeaters from the transmitter to the receiver. And a means for transmitting data from the repeater within the maximum time, and controlling a delay time of data communication via the plurality of repeaters. In a network in which a transmitter, a receiver, and a plurality of repeaters are connected, the maximum time of data relay processing in each of the repeaters is defined using the number of stages of the repeaters from each of the repeaters to the receiver. A network QoS control system, comprising: means for transmitting data from each of said repeaters within said maximum time, and controlling a delay time of data communication via a plurality of said repeaters. In a network in which a transmitter, a receiver, and a plurality of relays are connected, a maximum time of data relay processing in each of the relays defined using the number of stages of the relays from the transmitter to the receiver. Comparing the maximum time of data relay processing in each of the relays defined using the number of stages of the relays from each of the relays to the receiver, and transmitting data from the relay within a smaller maximum time. A network QoS control system, comprising: means for sending a packet to a network, and controlling a delay time of data communication via the plurality of repeaters. 3. The network QoS control system according to claim 1, wherein a maximum time of data relay processing in the relay is changed based on a data traffic passing through the relay. 3. The network QoS control system according to claim 1, wherein a maximum time of data relay processing in the relay device is changed based on priority information of communication data. In a network in which a transmitter, a receiver, and a plurality of repeaters are connected, a priority for communication data is determined using the number of stages of the repeaters from the transmitter to the receiver, and data in each of the repeaters is determined. A network having means for defining a maximum time for relay processing and means for sending data from the repeater within the maximum time, and controlling a delay time of data communication via the plurality of repeaters. QoS control system. In a network in which a transmitter, a receiver, and a plurality of repeaters are connected, a priority for communication data is determined using the number of stages of the repeaters from each of the repeaters to the receiver, and a priority is set for each of the repeaters. It has means for defining a maximum time for data relay processing and means for sending data from each of the repeaters within the maximum time, and controls a delay time of data communication via a plurality of the relays. Network QoS control system. In a network in which a transmitter, a receiver and a plurality of repeaters are connected, in each of the repeaters defined from the priority of communication data determined by the number of stages of the repeaters from the transmitter to the receiver The maximum time of the data relay processing is compared with the maximum time of the data relay processing in each of the relays defined from the priority of the communication data determined by the number of stages of the relays from each of the relays to the receiver. A network QoS control system comprising means for transmitting data from the repeater within a smaller maximum time, and controlling a delay time of data communication through the plurality of repeaters. 8. The network QoS control system according to claim 6, wherein a maximum time of data relay processing in the relay is changed based on a data communication amount passing through the relay.

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