JP2004222065A - Band sharing subscriber transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a band sharing subscriber transmission system which collateralizes the fairness among subscriber terminals moving over line terminating devices in the case that a plurality of subscriber terminals belong to and are connected to subordinate of a circuit terminating device. <P>SOLUTION: Subscriber line termination equipment B storing a circuit C is provided with a transmission right acquisition history storage part B2 where transmission right acquisition history data of subscriber terminals which has been transmitted in the past is recorded in time series, and a transmission right computing unit B1 which determines a subscriber terminal to which the next transmission right should be given, on the basis of past transmission right acquisition history data recorded in the storage part B2 so as to preferentially give the transmission right to a subscriber terminal having the least number of times of frequency. The determined subscriber terminal is designated to a header of a data packet addressed to the line terminating device to which the subscribed terminal belongs, and a notice is given. When receiving the notice of the data packet, the line terminating device transmits a transfer suppression indication to subordinate subscriber terminals other than the subscriber terminal to which the transmission right is given. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bandwidth sharing subscriber transmission system in which one line is shared by a plurality of subscribers.
[0002]
[Prior art]
In the conventional band sharing subscriber transmission system, generally, as shown in FIG. 4, a subscriber line terminal device receiving a transmission request from a line terminating device checks fairness among n line terminating devices. In order to ensure this, the prioritization of the next transmission right is calculated based on the past transmission history, and the transmission right of the uplink shared band based on the calculation result is given to the line terminating device. Absent). Therefore, in the line terminal device, the transmission right acquisition history table (shown in FIG. 5) for recording the total number of transmissions for each line termination device, and the transmission right acquisition history table is referred to, and the priority of the next transmission right is referred to. And a transmission right calculator for calculating the ranking.
[0003]
In addition, in a transmission band shared by a plurality of information sources, a shared band allocation for allocating a plurality of bands per unit time in response to a request for permission to use a shared band per unit time notified from a plurality of information sources per unit time. A method is also known, in which a shared bandwidth use permission request from a plurality of information sources is taken in every unit time, and a shared bandwidth is allocated to a plurality of information sources (for example, Patent Document 1). reference).
[0004]
[Patent Document 1]
JP-A-2001-257701 (pages 1-4, FIG. 2)
[0005]
[Problems to be solved by the invention]
However, according to the above-mentioned prior art, in a configuration in which a plurality of subscriber terminals are further connected under the terminal-side interface of the line terminating device, transmission from the subscriber line terminal equipment side to these subscriber terminals is performed. Since the right cannot be controlled, there is a problem in that fairness cannot be maintained between subscriber terminals spanning line termination devices.
[0006]
Therefore, a main object of the present invention is to provide a bandwidth sharing subscriber transmission system for ensuring fairness among subscriber terminals spanning line termination devices when a plurality of subscriber terminals are connected under the control of the line termination device. Is to provide.
[0007]
[Means for Solving the Problems]
In the bandwidth sharing subscriber transmission system of the present invention, a subscriber terminal (11 in FIG. 1) in which one line (C in FIG. 1) is expanded into a tree through a plurality of line terminating devices (1 to N in FIG. 1). 1x, 21-2y, N1 to Nz), the subscriber line terminal equipment (B in FIG. 1) accommodating the line is a subscriber line terminal equipment that accommodates the line. A transmission right acquisition history storage unit (B2 in FIG. 1) that records transmission right acquisition history data in chronological order, and the number of transmissions is determined based on past transmission right acquisition history data recorded in the transmission right acquisition history storage unit. A transmission right calculator (B1 in FIG. 1) for determining a subscriber terminal to which the next transmission right is to be given so as to give the transmission right to the least number of subscriber terminals preferentially; Is added to the header of the data packet addressed to the line terminating The line terminating device that specifies and notifies the subscriber terminal, and receives the notification of the data packet, transmits a transfer suppression instruction to subordinate subscriber terminals other than the subscriber terminal to which the transmission right is given. I do.
[0008]
It is preferable that the recording, determination and designation of the subscriber terminal be performed based on the ID of the line terminal device under which the subscriber terminal is subordinate and the ID of the subscriber terminal between the subscriber terminals under the line terminal device.
[0009]
In addition, the determination of the subscriber terminal in the transmission right calculator is based on the total number of transmissions from the beginning for the subscriber terminal that has transmitted during the predetermined period, or within the period for the subscriber terminal that has transmitted during the predetermined period. This may be performed based on the total number of transmissions or the number of transmissions weighted for each subscriber terminal.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings in order to clarify the above and other objects, features, and advantages of the present invention.
[0011]
Referring to FIG. 1, a bandwidth sharing subscriber transmission system according to an embodiment of the present invention is illustrated. The bandwidth sharing subscriber transmission system includes Ethernet (registered trademark) under N line terminators 1, 2,... N installed on the subscriber side and under each of the line terminators 1, 2,. X) subscriber terminals 11 to 1x, y 21 to 2y... Z, N1 to Nz, and the subscriber line terminal equipment B connected to the line terminators 1 to N. ., N share a single transmission line.
[0012]
That is, starting from the data line C, N line termination devices 1, 2,..., N, x subscriber terminals 11 to 1x from the line termination device 1, and y from the line termination device 2 The transmission paths are expanded in a tree shape from the line terminating device N to the z subscriber terminals N1 to Nz, such as the subscriber terminals 21 to 2y.
[0013]
The subscriber uses each subscriber terminal to communicate with the other subscriber terminal via the controlled line terminator, data line C and subscriber line terminal B. . The other subscriber terminal is one of the subscriber terminals shown in FIG. 1 and a subscriber line terminal device, a data line, and a line termination device facing the subscriber line terminal device B (FIG. 1). (Not shown in FIG. 1). Since there is only one transmission line constituting the data line C, it is necessary to grant the transmission right by the subscriber line terminal B at the time of communication. If there is no conflict with another subscriber, the transmission right is given unconditionally, but if there is a conflict, arbitration is required.
[0014]
The subscriber line terminal device B includes a transmission right acquisition history storage unit B2 that records, in a time series, transmission right acquisition history data of the subscriber terminal transmitted in the past and the line termination device under the control of the subscriber terminal; A transmission right calculator B1 for determining a line terminating device to which the next transmission right should be given based on past transmission right acquisition history data recorded in the transmission right acquisition history storage section B2 and a subscriber terminal under the line termination device. I have.
[0015]
FIG. 2 exemplifies past transmission right acquisition history data stored in the transmission right acquisition history storage unit B2. The transmission right acquisition history storage unit B2 stores the total number of all transmissions from the beginning, but the transmission right acquisition history data is presented only to the subscriber terminal that has transmitted during a predetermined period. Is only the transmission record for. In other words, the transmission right acquisition history data is updated every predetermined period, but the number of transmissions indicates the total from the beginning.
[0016]
Referring to FIG. 2, the first transmission is performed from the subscriber terminal 12 of the line termination device 1, and as a result, the total number of transmissions is two. This means that the first transmission from the subscriber terminal 12 of the line termination device 1 has already been performed before the current predetermined period. The second transmission is performed from the subscriber terminal 35 of the line termination device 3, and as a result, the total number of transmissions is two. Hereinafter, the same applies.
[0017]
The transmission right calculator B1 determines the line terminating device to which the transmission right is to be given and the subscriber terminals under the line termination device based on the number of transmissions based on the transmission right acquisition history data during the period, that is, the total number of transmissions from the beginning. I do. The determination is made such that when transmission requests conflict, the transmission right is preferentially given to the subscriber terminal with the least number of transmissions.
[0018]
Further, the transmission right calculator B1 determines, for the subscriber terminal that has transmitted during the period, the line termination device to which the transmission right is to be given and the subscriber terminal under the line termination device based on the number of transmissions during the period. It can also be done. In this case, the transmission right calculator B1 involves an operation of subtracting the total number of transmissions up to the previous period from the number of transmissions based on the transmission right acquisition history data in the period before the comparison. The comparison is performed on the result of the subtraction. According to this operation mode, prioritization can be performed based on the latest number of transmissions, so that it can be expected that a communication system operation that reflects the current situation can be performed more than relying solely on updating the transmission right acquisition history data.
[0019]
Further, the transmission right calculator B1 may determine the transmission right by weighting the number of transmissions for each subscriber in each of the above-described two operation modes. In other words, even if the total number of transmissions from the beginning or the number of transmissions in the predetermined period is the same, weights are given to Mr. Ko and to Mr. B, so that Mr. He has priority over unweighted Hei, and Ko has priority over Otsu. According to this mode of operation, it becomes possible to provide differentiated services in exchange for a surcharge of the usage fee.
[0020]
FIG. 3 shows a main part of the data packet A flowing on the data line C. The data packet A is prefixed to the IP packet with a header including a line terminal ID and a subscriber terminal ID. The line termination device ID specifies the line termination device to which the next transmission right has been assigned, and the subscriber terminal ID specifies the subscriber terminal under the line termination device and to which the next transmission right has been granted.
[0021]
It is assumed that the subscriber terminal is connected to the subscriber line terminal device B via the line terminating device and is transmitting and receiving data. If the subscriber terminal knows the transmission, it first issues a transmission request. If the transmission requests do not conflict, the transmission right is unconditionally granted. However, in the case of contention, arbitration is required between the subscriber terminals that have requested transmission.
[0022]
Based on the recorded transmission right acquisition history data, the transmission right calculator B1 gives priority to the subscriber terminal with the least number of transmissions in a predetermined period and the line terminating device to which the subscriber terminal is connected. To the right to send. Then, in the header of the downlink data packet A, the ID of the subscriber terminal to which the transmission right is given and the line termination device ID for the line termination device connected to the subscriber terminal are described.
[0023]
Now, if the line termination device ID indicates the line termination device 1 and the subscriber terminal ID indicates the subscriber terminal 11, the line termination device 1 transmits to the subscriber terminals 12 to 1x other than the subordinate subscriber terminal 11. A transmission suppression instruction is issued using the ICMP protocol in the IP packet. The subscriber terminal 11 can transmit via the line termination device 1 and the data line C without any problem.
[0024]
When the subscriber terminal 11 under the line terminating device 1 to which the transmission right is given transmits the uplink data to the subscriber line terminal device B, the line terminating device is stored in the transmission right acquisition history storage section B2 of the subscriber line terminal device B. 1 and the ID of the subscriber terminal 11 and the total number of transmissions are recorded and can be referred to at the time of the next transmission right grant.
[0025]
【The invention's effect】
By adopting the configuration as described above, the present invention can be applied to a case where a plurality of subscriber terminals are expanded in a tree under the line termination device and connected to each other, and between the subscriber terminals spanning between the line termination devices. This has the effect that the transmission right can be kept fair and the data transfer efficiency of the subscriber terminal given the transmission right can be improved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an actual example of a band sharing subscriber transmission system according to the present invention; FIG. 2 illustrates past transmission right acquisition history data stored in a transmission right acquisition history storage unit B2 in FIG. 1; FIG. 3 is a diagram showing a main part of a data packet A flowing on a data line C. FIG. 4 is a block diagram showing an example of a conventional band sharing subscriber transmission system. FIG. 5 is a transmission right in the conventional example of FIG. Diagram showing an example of an acquisition history table [Explanation of symbols]
1 to N Line terminators 11 to Nz Subscriber terminal A Data packet B Subscriber line terminal B1 Transmission right calculator B2 Transmission right acquisition history storage C Data line

Claims (5)

In a band sharing subscriber transmission system in which one line is shared by subscriber terminals expanded in a tree via a plurality of line terminating devices,
The subscriber line terminal device accommodating the line,
Based on the transmission right acquisition history data recorded in the transmission right acquisition history storage unit that records the transmission right acquisition history data of the subscriber terminal transmitted in the past in chronological order, A transmission right calculator for determining a subscriber terminal to which the next transmission right should be given so as to give the transmission right to the subscriber terminal with the least number of transmissions,
Notifying by designating the subscriber terminal in the header of the data packet addressed to the line terminating device under the determined subscriber terminal,
A line sharing subscriber transmission system, wherein the line termination device that has received the notification of the data packet transmits a transfer suppression instruction to subordinate subscriber terminals other than the subscriber terminal to which the transmission right has been given. The method according to claim 1, wherein the recording, determination and designation of the subscriber terminal are performed based on an ID of a line terminal device under which the subscriber terminal is subordinate and an ID of the subscriber terminal between subscriber terminals under the line terminal device. 2. The bandwidth sharing subscriber transmission system according to claim 1. The bandwidth sharing subscriber according to claim 1 or 2, wherein the determination of the subscriber terminal is performed based on the total number of transmissions from the beginning of the subscriber terminal that has transmitted during a predetermined period. Transmission system. The bandwidth sharing subscription according to claim 1 or 2, wherein the determination of the subscriber terminal is performed based on the total number of transmissions in the subscriber terminal that has transmitted during a predetermined period. Person transmission system. The bandwidth sharing subscriber transmission system according to any one of claims 1 to 4, wherein the determination of the subscriber terminal is performed based on the number of transmissions weighted for each subscriber terminal.

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