JP2003092581A - Band control apparatus, one-to-many communication system and band control method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a station side communication device for reducing a fluctuation value of a data transmission waiting time of a subscriber side communication device when a minimum guaranteed band is set to an arbitrary value for each subscriber side communication device. Provided is a band control device provided with the band control method. A main communication apparatus stores a weight proportional to a minimum guaranteed speed for each slave communication apparatus.
And an allocation counter 305 for counting the packet length transmitted by the slave communication device in units of a fixed packet size;
A transmission order control unit 303 for giving a transmission permission to the slave communication device in order in a fixed packet size unit and stopping the transmission permission in an order in which the allocation number counter exceeds the amount of the band weight corresponding to the slave device. By using the provided bandwidth control device, the minimum speed for each slave communication device is guaranteed, and
Reduce fluctuations in data transmission wait time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to one main communication device and a plurality of slave communication devices that are connected to each other via a branched transmission path so that a plurality of slave communication devices share a transmission band for communication. The present invention relates to a band control device and a band control method included in a master communication device that guarantees a minimum band to a plurality of slave communication devices in a multi-to-multi communication system.

[0002]

2. Description of the Related Art Conventionally, as this band controller,
For example, there is one as described in JP-A-2000-13434. FIG. 8 shows a conventional band control device described in the above publication.

In FIG. 8, buffer memories 805-8
Reference numeral 08 is for temporarily storing packets input from the input ports 801 to 804, and the output port side transmission circuit 8
Reference numeral 10 is for extracting packets from the buffer memories 805 to 808 in a predetermined order and outputting them to the output port 809.

A packet extraction order setting unit 811 is also provided.
Is the request confirmation counter 812 and the order change counter 8
13 and an order calculation unit 814. The request confirmation counter 812 indicates the order in which the input ports 801 to 804 are checked, and the order change counter 813.
Is for changing the order of taking out. Further, the order calculation unit 814 uses the request confirmation counter 812 and the order rearrangement counter 813 to change the order in which packets are taken out from the buffer memories 805 to 808 each time the packets are taken out, and the input ports 801 to 801
The frequency of the order of extracting packets from 804 is controlled to be uniform among the input ports 801 to 804.

FIG. 9 shows the transition of the order in which the order calculation unit 814 takes out packets using the request confirmation counter 812 and the order rearrangement counter 813. The order rearrangement counter 813 is cycled every time the request confirmation counter 812 completes a cycle. Will count up by 1. Then, the buffer memory 805 from which the order calculation unit 814 extracts the packet.
The order of to 808 is calculated by the exclusive OR of the request confirmation counter 812 and the order change counter 813.

That is, in FIG. 9, when the order change counter 813 is "0" (901), the order of the buffer memories 805 to 808 for fetching packets is changed every time the request confirmation counter 812 counts up from "0" by one. # 0 buffer memory 805, # 1 buffer memory 80
6, # 2 buffer memory 807, # 3 buffer memory 8
It changes to 08. Then, when the request confirmation counter 812 makes one cycle and the order change counter 813 counts up by 1 to become "1" (902), the order of the buffer memories for taking out the packets is # 1 buffer memories 806, # 0.
Buffer memory 805, # 3 Buffer memory 808, #
A transition is made to the 2-buffer memory 807. Similarly, when the order change counter 813 has increased to 2 (903), the order of the buffer memories for extracting the packets is as follows: # 2 buffer memory 807, # 3 buffer memory 808, # 0 buffer memory 805, # 1 buffer memory 806. , When the order change counter 813 is increased to 3 (90
4) is the # 3 buffer memory 808, # 2 buffer memory 807, # 1 buffer memory 806, and # 0 buffer memory 805.

By such a method, the average waiting time from the arrival of a packet at the input ports 801 to 804 until the packet is taken out becomes equal among the input ports 801 to 804 and becomes fair.

FIG. 7 shows the configuration of a system in which the conventional band control device is used in a one-to-many type communication system.

Here, the station side communication device 7000 is connected to the subscriber side communication devices 7101 to 7103 via the optical couplers 7201 to 7204 via the star coupler 7205.

The subscriber side communication devices 7101 to 7103 are
Subscriber side communication devices 7101 to 7103 and station side communication device 1
It is composed of subscriber side terminators 7111 to 7113 for terminating signals and optical signals to and from 000, line interfaces 7121 to 7123, and LAN interfaces 7131 to 7133. Telephones 7141 to 71 for the line interfaces 7121 to 7123
43 is connected, and LAN interfaces 7131 to 71
33 is a computer or a concentrator (HUB) 71
51 to 7153 are connected.

The station-side communication device 7000 includes the station-side communication device 7000 and the subscriber-side communication devices 7101 to 710.
3 and subscriber-side communication devices 7101 to 7001 for terminating a signal exchanged with the S.
It is composed of a cross-connect (hereinafter, referred to as XC) 7002 for separating and multiplexing communication exchanged with the 7103, a line interface 7003, and a LAN interface 7004. This station-side terminating device 7001 includes
There is a packet extraction order setting unit 811 (not shown) using the conventional bandwidth control device, which has a request confirmation request confirmation counter 812, an order change counter 813, and an order calculation unit 814. Line interface 7
An exchange 7005 is connected to 003, and a router 7006 is connected to a LAN interface 7004.

The subscriber side communication devices 7101 to 71
If there is data to be transmitted from station 03 to station-side communication device 7000, a transmission request is transmitted to station-side communication device 7000, and data is transmitted to the shared band by permission of transmission from station-side communication device 7000.

FIGS. 10A and 10B are explanatory views showing an example of data transmission / reception between the station side communication device 7000 and the subscriber side communication devices 7101 to 7103 in the communication system shown in FIG. .

In packet communication, all subscribers rarely use the band at the same time, and the packet length to be transferred is variable, so that FIG. 10 (A) and FIG.
As shown in (B), set a shared band on the transmission line,
Each subscriber side communication device uses the shared band as required.

As shown in FIG. 10A, in the subscriber side communication devices 7101 to 7103, the data (size Sp # i) transmitted from each subscriber side communication device is one cycle T.
The number of times Rn # i (hereinafter referred to as the number of times of transmission) transmitted by the uplink shared band 104 of x (size Ss) is calculated, and the number of times of transmission Rn # i and the transmission request flag are defined for each subscriber communication device. The uplink control signals 101 to 103 are transmitted to the station side communication device 7000. The number of times of transmission Rn # 1 is calculated by the equation (1), and the transmission request flag is set to '1' (ON state) in the case of data transmission.

Rn # i = Ss / Sp # 1 (1) The station side communication device 1000 selects one subscriber side communication device by the packet extraction order setting unit 811 in the station side termination device. Then, as shown in FIG. 10B, until the data transmission amount of the station side communication device 7000 exceeds the maximum packet length that can be used in packet communication, the unique number (# 0 to # 0 of the subscriber side communication device permitted to transmit is transmitted. #N) is set in the downlink control signal 105 and transmitted. Subscriber side communication device 7
101 to 7103 receive the transmission permission flag, and if the own unique number, transmit the upstream packet.

In the packet extraction order setting unit 811, as described with reference to FIG. 9, every time the request confirmation counter 812 completes one cycle, the order change counter 813.
Is incremented by 1, and the order calculation unit 814 calculates the exclusive OR of these two counters. Then, the calculated value is transmitted as the unique number of the subscriber-side communication device that gives the transmission permission.

That is, in the case where the four unique numbers # 0 to # 3 of the subscriber side communication devices are respectively connected,
When the order change counter is '0' (901), the transmission permission is given in the order of the subscriber communication device # 0, the subscriber communication device # 1, the subscriber communication device # 2, and the subscriber communication device # 3. Given. Next, when the order change counter is incremented by 1 (902), the subscriber side communication device # 1, the subscriber side communication device # 0, the subscriber side communication device # 3, and the subscriber side communication device # 2 are sequentially turned on. Transmission permission is given. Similarly, as the order change counter is incremented, the order is changed and transmission permission is given to each subscriber communication device, so that the communication time of the subscriber communication device waits for the turn (hereinafter referred to as the data transmission waiting time). () Average time will be fair.

Here, this conventional station side communication device 7000 is used.
The minimum guaranteed bandwidth (hereinafter referred to as the minimum guaranteed speed) is set for each of the subscriber communication devices 7101 to 7103 so that the packet length that can be transferred at one time is proportional to the minimum guaranteed speed. It can be realized by changing it.

For example, assuming that the maximum bandwidth that can be used in the entire system is Bmax, the minimum guaranteed speed B for N (hereinafter, N is an integer of 2 or more) subscriber communication devices.
i (unique number of subscriber communication device i = 1 to N) is set. However, the sum of the minimum guaranteed speeds Bi is the maximum bandwidth Bmax
Containment is restricted so that it does not exceed the limit. Further, the maximum packet length that can be transmitted at one time is Wi × MTU.
Here, Wi is a weight (hereinafter, referred to as a band weight) for each subscriber communication device calculated by Bi / Bmax, and MTU is the maximum packet length size of packet communication. If the product of Wsum, which is the total of band weights, and the time Tu required to transmit a packet of maximum packet length size corresponds to one cycle of the minimum guaranteed speed of this one-to-many type communication system, Even in a congested situation where the subscriber side communication device constantly requests transmission, any subscriber side communication device can guarantee the minimum guaranteed speed Bi.

[0021]

However, in the configuration of this conventional example, the minimum guaranteed speed is set to the subscriber side communication device 71.
When changing and setting every 01 to 7104, the variation value of the data transmission waiting time may increase.

This will be described below with reference to FIG.

FIG. 11 shows the packet transmission sequence at this time. That is, the packets are transmitted so that the transmission order of the packets is equal, but during one cycle (Wsum × Tu) (1 in the figure
Shown by 12. In), packets are continuously transmitted by the bandwidth weight set for each subscriber communication device.

Here, after the packet of the subscriber side communication device # 1 has been transmitted, next, the subscriber side communication device # 1 is transmitted.
The maximum data transmission waiting time until the packet 1 is transmitted is Tu × (Wsum−W ₁ ) × 2 (indicated by 111 in the figure) and the minimum Tu × W (W is 0 or a positive integer). . That is, the fluctuation value of the data transmission waiting time is as follows. _{Tu × (Wsum-W 1)} × 2-Tu × W = Tu × (2
Wsum-2W ₁ -W) That is, the maximum is when Wi is “1”.

When the variation value of the data transmission waiting time is large as described above, the processing of the received packet may not catch up when the subscriber side communication device communicates voice and images in real time, and the voice is interrupted. Or a part of the image may be missing. As a countermeasure against this, there is a method of providing a buffer memory for increasing the processing time to absorb this variation, but for this purpose, a sufficient buffer memory considering the variation is required.

The present invention solves such a problem of the prior art, and when the minimum guaranteed bandwidth is set to an arbitrary value for each subscriber communication device, data transmission of the subscriber communication device is performed. An object of the present invention is to provide a band control device and a band control method included in a station-side communication device that reduces variation in waiting time.

[0027]

A band control device according to the present invention, which solves the above problems, includes a band weight holding unit for storing a weight proportional to a minimum guaranteed speed set in a communication device of a communication partner, and a communication device. An allocation counter that counts transmitted packets in units of a predetermined packet size, and transmission permission is given to the communication device in order in units of this packet size, and the count value of the allocation counter exceeds the bandwidth weight corresponding to the communication device. And a transmission order control unit that sometimes suspends transmission permission.

Further, in the band control device according to the present invention, the transmission order control unit further changes the order when the count values of all the allocation number counters exceed the band weight.

Further, the bandwidth control method according to the present invention includes the step of counting the packets transmitted by the communication device of the communication partner in units of a predetermined packet size, and the packet size until the counted value exceeds the bandwidth weight. The steps of repeatedly giving transmission permission to the communication devices in the same unit in a unit, the step of stopping the transmission permission when the count value exceeds the band weight corresponding to the communication device, and the count values of all the communication devices set the band weights. If it exceeds, it has a step of changing the order of giving the transmission permission.

Further, the bandwidth control method according to the present invention is a process for making the order of transmission permission given to the communication device even when the order is changed.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION A band control device according to the present invention comprises a band weight holding unit for storing a weight proportional to a minimum guaranteed speed set in a communication device of a communication partner, and a packet transmitted by the communication device into a predetermined packet. An allocation count counter that counts in size units, and a transmission order that sequentially grants transmission permission to communication devices in packet size units and stops transmission permission when the count value of the allocation count counter exceeds the bandwidth weight corresponding to the communication device. And a control unit.

According to this structure, the band control device permits the communication devices to transmit in order, and limits the band according to the band weight proportional to the minimum guaranteed speed.

As a result, even if a different minimum guaranteed speed is set for each communication device, data transmission can be performed fairly while keeping the minimum guaranteed speed of each communication device.

Further, the transmission order control section of the band control device according to the present invention further changes the order when all the count values exceed the band weight.

According to this configuration, the band control device changes the transmission order for each cycle in which the transmissions of all communication devices are transmitted at a rate corresponding to the band weight.

As a result, even if the minimum guaranteed speed is changed for each communication device, the fluctuation value of the data transmission waiting time of each communication device can be reduced.

Further, the band control device according to the present invention, when the transmission permission is given to each of the N communication devices N times by changing the order, the first to
The Nth order is assigned at least once.

According to this structure, the band control device gives the transmission permission to all the communication devices so that the transmission order is uniform.

As a result, even if the minimum guaranteed speed is changed for each communication device, the fluctuation value of the data transmission waiting time of each communication device can be reduced.

Further, the packet size unit that the bandwidth control device according to the present invention permits is the maximum packet length that can be used in packet communication.

According to this structure, since the bandwidth control device grants transmission permission to all communication devices in units of maximum packet length, the communication devices transmit packets without dividing them and each communication device occupies the transmission path. You can save time.

The band weight of the band control device according to the present invention is a value obtained by dividing the minimum guaranteed speed of the communication device by a predetermined minimum unit speed.

As a result, even when various minimum guaranteed speeds are set for the communication device, the bandwidth control device transmits the packet without dividing it and determines the time for which each communication device occupies the transmission path. Can be shortened.

A one-to-many type communication system according to the present invention includes a main communication device having a band control device according to the present invention,
The communication system includes a plurality of communication devices that are communication partners of the main communication device, and a transmission line that connects the main communication device and the plurality of communication devices.

As a result, the present one-to-many type communication system can reduce the fluctuation value of the data transmission waiting time of each communication device even if the minimum guaranteed speed is changed for each communication device.

Further, the bandwidth control method according to the present invention includes the step of counting the packets transmitted by the communication device of the communication partner in units of a predetermined packet size, and the packet size until the counted value exceeds the bandwidth weight. The steps of repeatedly giving transmission permission to the communication devices in the same unit in a unit, the step of stopping the transmission permission when the count value exceeds the band weight corresponding to the communication device, and the count values of all the communication devices set the band weights. If it exceeds, it has a step of changing the order of giving the transmission permission.

According to this method, since the transmission order is changed in every cycle in which all communication devices transmit at a rate corresponding to the band weight, even if the minimum guaranteed speed is changed for each communication device, It is possible to reduce the fluctuation value of the data transmission waiting time.

Further, the step of changing the order in the bandwidth control method according to the present invention is such that, when transmission permission is given to each of N communication devices N times, all communication devices are numbered from 1st to Nth. Is a process that is assigned at least once.

According to this method, since the transmission permission is given so that the transmission order of all the communication devices becomes equal, even if the minimum guaranteed speed is changed for each communication device, the data transmission waiting time of each communication device is changed. The fluctuation value of can be reduced.

The present invention will be described in detail below with reference to the drawings.

(Embodiment) FIG. 1 shows a block diagram of a one-to-many type communication system in an embodiment of the present invention. In FIG. 1, one station-side communication device 1 which is a main communication device.
000 and a plurality of subscriber communication devices 1 that are slave communication devices
101 to 1103 are connected in a point / multipoint format. That is, the optical fiber 1204 is connected to the station side communication device 1000, and the subscriber side communication devices 1101 to 1101.
Optical fibers 1201 to 1203 are connected to 1103, and an optical fiber 1204 and optical fibers 1201 to 1203 are connected.
An optical coupler 12 for branching or coupling a transmission signal to and from 3
It is connected by 05.

Subscriber side communication devices 1101 to 1103 are subscriber side termination devices 1111 to 1113, telephone line processing units 1121 to 1123, and packet communication processing units 1131 to 1113.
And 1133.

The subscriber side terminating devices 1111 to 1113 perform control signal terminating and optical terminating with the station side communication device 100, and also perform demultiplexing and multiplexing of telephone and Ethernet (registered trademark) information data.

Telephone line processing units 1121 to 1123 are telephone line interfaces, and analog telephones 1141 to 1141.
1143 is connected.

The packet communication processing units 1131 to 1133 are connected to the PC terminals 1151 to 1153, and when there is data to be transmitted to the station side communication apparatus 1000, a transmission request is transmitted to the station side communication apparatus 1000. Data is transmitted to the shared band by the transmission permission from the station side communication device 1000.

The station side communication device 1000 is the station side terminating device 10
01, XC1002 which is a fixed switch, exchange interface 1003, and router interface 100.
4 and.

The station side terminating device 1001 separates and multiplexes the communication data of each subscriber from the subscriber side communication devices 1101 to 1103.

The XC 1002 performs demultiplexing and multiplexing of telephone data and packets in each information data, and an exchange interface 1003 to the exchange 1005, a router interface 1004 to the router 1006, and a terminal device 1001 on the station side.
It is a fixed switch between and.

FIG. 2 shows packet communication processing units 1131-1.
FIG. 13 is a block diagram illustrating a packet transfer process in 133.

The packet queue 200 is sent from a personal computer or the like.
The Ethernet (registered trademark) packet is temporarily stored, and the packet size counter 201 transmits the number of transmissions Rn.
To count.

The transmission request generator 202 determines the number of transmissions Rn.
And the transmission request are mapped to the upstream control signal and are generated. The packet transmitter / receiver 203 transmits / receives the control signal and the packet data from the subscriber side terminal devices 1111 to 1113.

The transmission permission acquisition unit 204 is the terminal device 10 on the station side.
01 receives the transmission permission from the packet queue 200
Give queuing instructions to.

The packet communication processing units 1131 to 1133 configured as described above take out the size of the packet held in the packet queue 200, calculate the number of transmissions Rn by the packet size counter 201, and generate the transmission request generation unit. An uplink control signal to which the transmission request is mapped is generated in 202 and is transmitted by the packet transmitting / receiving unit 203.

FIG. 3 is a block diagram of the station-side terminating device 1001 included in the station-side communication device 1000.

The packet transmitter / receiver 301 transmits / receives control signals and packet data from the subscriber side communication devices 1101 to 1103, and the transmission permission generation unit 302 maps the transmission permission to the subscriber side communication devices 1101 to 1103 to the downlink control signal. To do.

The band control device 300 monitors the packet received by the packet transmitter / receiver, and then the subscriber side communication device 1
It controls the order of transmitting packet transmission permission to 101 to 1103, and includes a transmission order control unit 303, a band weight holding unit 304, an allocation number counter 305, a request confirmation counter 306, and an order rearrangement counter 307. .

The transmission order control unit 303 selects the subscriber side communication devices 1101 to 1103 to which transmission permission is given.

The band weight holding unit 304 holds the band weight Wi obtained by dividing the minimum guaranteed speed Bi assigned to each of the subscriber side termination devices 1101 to 1103 by the minimum unit δ before the system is activated. By further reducing this minimum unit δ, it is possible to guarantee a fine band, but since the sum Wsum of band weights increases and the sum of transmission waiting times increases, it is necessary to set an appropriate value. is there.

The number-of-allocations counters 305 are present by the number of the subscriber communication devices 1101 to 1103, and count the number of allocations in the maximum packet length unit for each of the subscriber communication devices 1101 to 1103. This allocation counter 305
Is set to a count value CWi assigned to each subscriber-side terminal device as an initial value.

The request confirmation counter 306 and the order change counter 307 perform the same operations as in the conventional example.

Station-side terminating device 10 configured as described above
01 allocates a band by the band allocation process described below so as to guarantee the minimum guaranteed speed Bi for each of the subordinate side terminal devices 1111 to 1113 under the control. Next, the operation will be described.

FIG. 4 is a flow chart showing the operation of the band allocating process of station-side terminating device 1001 in this embodiment.

First, when the packet transmitter / receiver 301 receives the upstream control signals from the subscriber side communication devices 1101 to 1103, the packet transmitter / receiver 301 notifies the sending order control unit 303 of a unique number having a transmission request flag REQi of 1. . Then, the transmission order control unit 303 determines that the subscriber communication devices 1101 to 11
The unique number of 03 is stored (step S401).

At this timing, the allocation counter 30
The count value CWi of 5 is set to the subscriber communication device 1101-1.
The band weight Wi for each 103 is initialized (step S40).
2).

Next, the transmission order control unit 303 calculates the exclusive OR of the request confirmation counter 306 and the order rearrangement counter 307, similarly to the conventional band control device described in the above publication (step S403). . This result is calculated as the unique number of the subscriber communication device 1101 to 1103 that gives the transmission permission.

Then, the transmission request flags REQi of the subscriber side communication devices 1101 to 1103 corresponding to this unique number.
Also, it is confirmed whether the count value CWi of the allocation counter 305 matches the following conditional expression (2) (step S404).

(REQi = 1) AND (CWi> 0) (2) When Expression (2) is satisfied, the transmission permission generation unit 302 maps the unique numbers of the subscriber-side communication devices 1101 to 1103 to the downlink control signal. Then, the communication is transmitted to the corresponding subscriber side communication devices 1101 to 1103, and transmission permission is notified (step S405). When the formula (2) is not satisfied, the request confirmation counter 306 is incremented by "1" (step S408), and the process returns to step S403.

Next, the transmission order control unit 303 determines the shared band S
The transmission packet size from the subscriber-side terminating device is monitored in units of s size, and when the frame for the maximum packet length (MTU) is received, it corresponds to the subscriber-side communication device 1101 to 1103 which has transmitted. The count value CWi of the allocation number counter 305 is decreased by "1" (step S406).

Next, it is confirmed whether or not there is a subscriber side terminating device that matches the equation (2), and if there is even one, the request confirmation counter 306 is incremented and step S40
It returns to 3 (step S407).

If there is no subscriber-side terminating device that satisfies the equation (2), the order change counter 307 is incremented by "1" and the process returns to step S401 (step S401).
409).

The fluctuation value of the data transmission waiting time when the above processing is executed will be specifically described with reference to FIGS. 5 and 6B.

In this example, it is assumed that the subscriber-side communication devices with unique numbers # 0 to # 3 have respective band weights of "1",
It is assumed that they are "4", "2", and "1". FIG. 5 is a transition diagram showing the transition of the count value CWi of the allocation number counter of each subscriber communication device when a request is always issued from each subscriber communication device with the maximum packet size.
(B) shows the packet transmission sequence at that time.

When the order rearrangement counter has the initial value "0", one cycle of the request confirmation counter transfers to the subscriber side communication apparatus # 0 to the subscriber side communication apparatus # 3 901 in the transition diagram of FIG.
The transmission permission is output packet by packet in the order shown in (5).
11-514).

In the next cycle of the request confirmation counter, the allocation request flag REQ from the subscriber side communication device is also in the same order.
Although i is confirmed, in this cycle, since the count value CW0 of the allocation counter of the subscriber communication device # 0 is “0”, the transmission permission to the subscriber communication device # 0 is not transmitted ( 515). Since the count value CW1 of the subscriber-side communication device # 1 is “3”, the transmission permission of one packet is transmitted to the subscriber-side communication device # 1 (516). Since the count value CW2 of the subscriber side communication device # 2 is “1”, the transmission permission of one packet is transmitted to the subscriber side communication device # 2 (517). Since the count value CW1 of the subscriber side communication device # 3 is "0", the transmission permission is not transmitted (518).

Similarly, the above is repeated until the values of all the allocation number counters become "0". When this process ends, the order change counter is incremented by 1, and this time the same process as above is performed in the order shown by 902 in the transition diagram of FIG. In the present embodiment, the number of subscriber side communication devices is four, so that the sequence rearrangement counters 901 to 903 form one cycle and repeat this. Figure 6
(B) shows one cycle of this order change counter.

FIG. 6 (A) shows a packet transmission arrangement when the conventional station side communication device is operated under the same conditions. That is, in the cycle (901) in which the first rearrangement counter 813 is “0”, one packet of the subscriber side communication device # 0 is transmitted with the request confirmation counter being “0” (501), and then the request confirmation is performed. When the counter is counted up to "1", the packets of the subscriber side communication device # 1 are continuously transmitted by four packets corresponding to the band weight (502). Next, when the request confirmation counter is counted up to "2", two packets of the communication device # 2 on the subscriber side are transmitted in succession (503), and the next request confirmation counter is "3" and the subscriber side. One packet of communication device # 3 is transmitted (50
4). When the request confirmation counter has completed one cycle, the order change counter 813 counts up to "1", and packets 505 to 508 are transmitted in the next cycle (902). Thereafter, the packet is transmitted in the same manner.

Here, the data transmission waiting time from the end of transmission of the packet of the subscriber side communication device # 0 to the next transmission of the packet of the subscriber side communication device # 0 is the same as the conventional example and the present invention. This embodiment will be compared with this embodiment. FIG. 6 of the conventional example
In (A), the waiting time 601 between the first and second allocations and the waiting time 6 between the second and third allocations are shown.
03 is Tu × 11, and the waiting time 602 between the second and third allocation is Tu × 6. Therefore, the variation value of the data transmission waiting time is Tu × 5. On the other hand, in the embodiment according to the present invention, as shown in FIG.
The waiting time 604 for the second and third allocations, the waiting time 605 for the second and third allocations, and the waiting time 606 for the third and fourth allocations are all Tu × 8, and the fluctuation value of the waiting time is It becomes 0. As described above, it can be understood that the bandwidth allocation processing of the present invention can significantly reduce the fluctuation of the data transmission waiting time as compared with the conventional example.

As described above, by performing the band allocation process which is the band control method of the present invention, the fluctuation of the data transmission waiting time between the subscriber side communication device and the station side communication device having different minimum guaranteed speeds. The value can be reduced.

Further, by setting the packet size unit used for counting the number of allocations to the maximum packet length that can be used in packet communication, the received packet is transmitted without being divided, and each communication device can use the transmission path. The time to occupy can be shortened.

[0090]

As described above, according to the present invention, even if the minimum guaranteed speed is changed for each subscriber side communication device in the one-to-many type communication system, the data transmission waiting time of each subscriber side communication device The fluctuation value can be reduced.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a one-to-many type communication system according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram of a packet communication processing unit of the subscriber side communication device of the one-to-many type communication system in the embodiment of the present invention.

FIG. 3 is a block configuration diagram of a station side terminating device having a band control device according to an embodiment of the present invention.

FIG. 4 is a flow chart of band allocation processing of the band controller according to the embodiment of the present invention.

FIG. 5 is a transition diagram of an allocation counter of the bandwidth control device according to the embodiment of the present invention.

FIG. 6A is a packet transmission sequence diagram of a band control device in a conventional example, and FIG. 6B is a packet transmission sequence diagram of a band control device in an embodiment of the present invention.

FIG. 7 is a block configuration diagram of a one-to-many type communication system in a conventional example.

FIG. 8 is a block configuration diagram of a bandwidth control device in a conventional example.

FIG. 9 is a transition diagram of the designated order of the subscriber side communication device in the embodiment of the present invention and the conventional example.

FIG. 10A is an upstream data transmission / reception diagram between a station side communication device and a subscriber side communication device in a one-to-many type communication system according to an embodiment of the present invention and a conventional example; And a conventional example of downlink data transmission / reception between a station-side communication device and a subscriber-side communication device in a one-to-many type communication system

FIG. 11 is a packet transmission array diagram by a bandwidth control device in a conventional example.

[Explanation of symbols]

200 packet queues 201 Packet size counter 202 Transmission request generator 203 Packet transmitter / receiver 204 Transmission permission acquisition unit 300 band control device 301 packet transceiver 302 Transmission permission generation unit 303 Transmission order control unit 304 band weight holding unit 305 Assignment counter 306 Request confirmation counter 307 Order change counter 801 input port 802 input port 803 input port 804 input port 805 # 0 buffer memory 806 # 1 buffer memory 807 # 2 buffer memory 808 # 3 buffer memory 809 output port 810 Output port side transmission circuit 811 Packet retrieval order setting unit 812 Request confirmation counter 813 Order change counter 814 Order calculation unit 1000 station side communication device 1001 Station side terminating device 1002 XC 1003 Switch interface 1004 Router interface 1005 exchange 1006 router 1101 Subscriber side communication device 1102 Subscriber side communication device 1103 Subscriber side communication device 1121 Telephone line processing unit 1122 Telephone line processing unit 1123 Telephone line processing unit 1131 Packet communication processing unit 1132 Packet communication processing unit 1133 packet communication processing unit 1141 telephone 1142 telephone 1143 telephone 1151 PC terminal 1152 PC terminal 1153 PC terminal 1201 optical fiber 1202 optical fiber 1203 optical fiber 1204 optical fiber 1205 Optical coupler 7000 station side communication device 7001 Station-side termination device 7002 XC 7003 line interface 7004 LAN interface 7005 exchange 7006 Router 7101 Subscriber side communication device 7102 Subscriber communication device 7103 Subscriber communication device 7121 Line interface 7122 Line interface 7123 Line interface 7131 LAN interface 7132 LAN interface 7133 LAN interface 7141 telephone 7142 telephone 7143 telephone 7151 Concentrator (HUB) 7152 Concentrator (HUB) 7153 Concentrator (HUB) 7201 optical fiber 7202 optical fiber 7203 Optical fiber 7204 Optical fiber 7205 Star coupler

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Atsushi Nakamura             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Kazuhiro Shinsako             4-3-1 Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa             Matsushita Communication Industry Co., Ltd. (72) Inventor Yuji Hashimoto             4-3-1 Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa             Matsushita Communication Industry Co., Ltd. F-term (reference) 5K032 CD01 DA01 DA04 DB01                 5K033 CC01 DA01 DA15 DB02 DB22

Claims (8)

[Claims] 1. A bandwidth weight holding unit that stores a weight proportional to a minimum guaranteed speed set in a communication device of a communication partner, and an allocation counter that counts packets transmitted by the communication device in a predetermined packet size unit. A band provided with a transmission order control unit that sequentially gives transmission permission to the communication device in units of the packet size, and stops the transmission permission when the count value of the allocation count counter exceeds the band weight corresponding to the communication device. Control device. 2. The band control device according to claim 1, wherein the transmission order control unit further changes the order when all the count values exceed a band weight. 3. When the transmission permission is given N times to each of the N communication devices due to the change of the order, all the communication devices have the first to Nth orders at least once. The bandwidth control device according to claim 2, which is allocated. 4. The bandwidth control device according to claim 1, wherein the packet size unit is a maximum packet length that can be used in packet communication. 5. The bandwidth control device according to claim 1, wherein the bandwidth weight is a value obtained by dividing a minimum guaranteed speed of the communication device by a predetermined minimum unit speed. 6. A main communication device having the band control device according to claim 1, a plurality of communication devices as communication partners of the main communication device, the main communication device and the plurality of communication devices. And a transmission line for connecting to another communication device 1
Multi-point communication system. 7. A step of counting packets transmitted by a communication device of a communication partner in a predetermined packet size unit, and the same as the communication device in the packet size unit until the counted value exceeds a band weight. A step of repeatedly giving a transmission permission, a step of stopping the transmission permission when the count value exceeds the band weight corresponding to the communication device, and a case where the count values of all the communication devices exceed the band weight , A step of changing the order of granting transmission permission. 8. The step of changing the order is such that, when a transmission permission is given N times to each of the N communication devices, all the communication devices have at least a 1st to Nth order. The degree is a process to be assigned.
The bandwidth control method described in.