JP2803546B2 - Broadcast service switch method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch system for a broadcast service, and in particular, to a frame (including an ATM cell and a packet) including an address for identifying a communication partner from a plurality of subscribers such as a frame relay and a packet switch. The present invention relates to a switch system for providing a broadcast service in a frame multiplex switching system that multiplexes and switches data.

[0002]

2. Description of the Related Art Conventionally, when a broadcast service is provided between a plurality of subscribers accommodated in this type of system, as shown in Table 1, the number of subscribers (terminals) subscribing to the broadcast service is determined. Only the address resource of the frame is used to prevent the frame from returning to the subscriber who transmitted the broadcast frame.

[0003]

[Table 1]

[0004]

In the conventional broadcast service switching method, since address resources are used by the number of subscribers, puncturing of address resources easily occurs. For example, in the frame format of the frame relay system when the address extension is not performed as shown in FIG.
023), and there is a problem that if only one broadcast connection to which the 1023 subscribers (terminals) subscribe is set, other connections cannot be made.

In order to avoid this problem, if a broadcast service is to be realized using one address resource, the frame is returned to the subscriber (terminal) that transmitted the broadcast frame. By the way, when the frame transmitted by the own terminal returns, the use of the frame can be considered only as confirmation of normal transmission / reception of the frame, but confirmation of transmission / reception of the frame is performed by receiving a short acknowledgment from the receiving terminal. Since the frame can be confirmed, the frame returned to the sending terminal becomes an unnecessary frame, and performing the reception confirmation or the discarding process for the frame is a useless process for the terminal. In the normal case, the frame returned to the sending terminal is also charged.

Accordingly, an object of the present invention is to allocate one resource in the address area of a frame to one broadcast group.
It is an object of the present invention to provide a broadcast service switch system that can provide a broadcast service to a subscriber who uses only an address and transmits a broadcast frame without returning the frame.

[0007]

SUMMARY OF THE INVENTION The present invention provides a system for multiplexing and switching frames containing communication information from a plurality of subscribers and a communication partner identification address. In a switch system of a broadcast service for performing distribution, a means for pre-assigning a unique number for each subscriber in the broadcast group to an exchange accommodating the plurality of subscribers, and setting a broadcast connection to the subscriber. Means for setting a broadcast identifier for identifying whether a frame from the subscriber is the broadcast frame, and canceling information corresponding to a subscriber from which the broadcast frame is transmitted. receives a frame from the subscriber, it determines whether this frame is the broadcast frame based on the broadcast identifier, the subscriber in the case of the broadcast frame The unique number corresponding to this
Means for inserting into the broadcast frame and inputting to the switch unit;
The broadcast frame switched by the switch unit
Is sent to each subscriber in the broadcast group.
To extract the unique number inserted in the frame
In the meantime, the cancellation information is
Means for referring to and canceling the transmission of the broadcast frame to the corresponding transmission source subscriber .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, which is applied to the system shown in FIG.

In FIG. 2, an exchange 100 for multiplexing and exchanging frames multiplexes frames of a line corresponding unit 103 accommodating a subscriber line and transmitting and receiving data in frame units, and a plurality (n) of line corresponding units 103. A frame multiplexing unit 102 to be separated and a plurality (m) of frame multiplexing units 102
(Only one is shown) and a switch unit 101 for connecting frames and exchanging frames. The subscriber line accommodated in each line corresponding unit 103 has four channels for connecting a plurality of subscribers (terminals), and the router 104 specifies a terminal designated according to the channel number (0 to 3). 150-1
To 150-3.

In FIG. 1, each line corresponding unit 103 converts a line address 413 for identifying all accommodated subscribers and a broadcast identifier (ID) 414 for broadcast frame identification from the channel number 411 and address 412 of the received frame. An input-side line address conversion table 410 for obtaining an input-side line address conversion table 410, an input-side broadcast table 420 for obtaining a broadcast group identification number 421 for identifying a subscriber within a broadcast group from the line address 413, and a line of a frame to be output. Address 41
3 to channel bitmap 43 for connection channel determination
1, an address 412, and an output side line address conversion table 430 for obtaining a broadcast ID 414, and an output side broadcast for obtaining a cancellation channel bitmap 441 for connection unnecessary channel determination from the identification number 421 in the broadcast group. And a table 440. The frame multiplexing unit 102 converts the input side multiplex address conversion table 450 for obtaining the switch address 452 from the line corresponding unit number 451 and the line address 413 indicating the frame source line corresponding unit 103 and the switch address 452 of the frame to be output. It has a line corresponding unit bit map 461 and an output-side multiplex address conversion table 460 for obtaining a line address 413.

Next, the operation will be described.

A control unit (not shown) of the exchange 100 includes:
When setting the connection of the subscribers (terminals 105-1 to 105-3), which channel and which address (information in the address area 310 in FIG. 3) are used by the input interface and the output interface of the line corresponding unit 103, respectively. Switch 10 so that it is routed correctly.
Set each part table in 0. At the time of the broadcast connection, the broadcast ID 4 of the line corresponding unit 103 is set according to the broadcast connection requesting subscriber.
14 and cancel / channel bitmap 441 are also set. Also, a unique broadcast group identification number 421 is assigned in advance to each subscriber in the broadcast group.

When ordinary frames are exchanged in this system, the frames transmitted among the subscriber (router 104), the line corresponding units (# 0 to #n) 103, the frame multiplexing unit 102, and the switch unit 101 Uses the format shown in FIG. In the address area 310 in this format, address information is converted and set according to the section in which the frame is transmitted. That is, when a frame from a subscriber is input to the incoming line side of the line corresponding unit 103, the line corresponding unit 103 refers to the input side line address conversion table 410 and determines the line channel number 411 and the address 412 of the frame. Line address 413
, And sends the frame to the frame multiplexing unit 102. The frame multiplexing unit 102 refers to the input side multiplex address conversion table 450 and
Is converted into the switch address 452 from the number 451 and the line address 413, and the frame is sent to the switch unit 101. The frame switched by the switch unit 101 is converted from the switch address 452 to the line address by the output-side multiplex address conversion table 460 by the frame multiplexing unit 102, and then converted to the line corresponding unit 103 specified by the line corresponding unit bitmap 461. Sent out, line corresponding unit 103
Is converted from the line address 413 to the address 412 by the output side line address conversion table 430, and is transmitted to the subscriber side using the channel specified by the channel bit map 431.

Next, a plurality of subscribers, ie, terminals 105-
When a frame (broadcast frame) is sent from a terminal , a line corresponding unit 103, a frame multiplexing unit 102, and a switch unit 101 in the exchange 100 are formed. The format shown in FIG. 3B is used for the frames transmitted between them.
In this case, together with the address conversion similar to the above-described normal frame, the broadcast service is identified by the broadcast ID 414 of the input-side address conversion table 410 of the line corresponding unit 103, and the transmission source address is searched by searching the input-side broadcast table 420.
The broadcast group identification number 421 corresponding to the subscriber is
Frame on the frame format for transmission in the exchange.
It is assigned to the entered broadcast group identification number area 320. In this case, for example, a broadcast group identification number of "1" is assigned to the terminal 105-1, "2" is assigned to the terminal 105-2, and "3" is assigned to the terminal 105-3. "1" is added (inserted) to the identification number area 320 within the broadcast group of the transmission frame. After this frame is switched by the switch unit 101, the output side multiplex address conversion table 46 of the frame multiplexing unit 102
After the address is converted by 0, the frame is transmitted to the 0th, 1st, and 3rd line correspondence units 103 in which the subscribers of this broadcast group exist according to the line correspondence unit bitmap 461. In the 0th line corresponding unit 103, the broadcast ID 4
The broadcast service (broadcast frame)
Frame format for transmission within the exchange
Broadcast group identification number area 3 temporarily inserted above
20 and the broadcast group assigned to it
The output-side broadcast table 44 is determined by the loop identification number 421.
Search 0 and cancel channel bitmap 441
Lead out . After canceling the corresponding cancel channel bitmap 441 from the channel bitmap 431 derived by the normal address conversion, the frame is transmitted to the remaining channels. In this case, since the broadcast subscriber of the 0th line corresponding unit 103 is only the terminal 105-1 (channel number 0), the cancellation / channel bit map 44
The frame is canceled by 1 and no frame is transmitted to the subscriber side. In addition, the first and third line corresponding units 10
In 3 , the transmission within the exchange is performed in the same manner as the 0th line corresponding unit 103.
Identification number in broadcast group on frame format
Although removal of the area 320 Ru is carried out, identify the broadcast group
Since the different number 421 does not correspond, the cancellation by the cancellation / channel bitmap 441 does not occur and the terminal 15
The frame is transmitted to 0-2 and 150-3.

[0016]

According to the broadcast service switching method of the present invention, an identifier for identifying whether a frame is a broadcast frame is provided in an address conversion table of a line corresponding unit accommodating a subscriber line,
When a broadcast frame is received from a subscriber, a unique number (identification number within the broadcast group) is given to each subscriber in the broadcast group, and a frame format for transmission within the exchange.
A temporary number is added (inserted) and transmitted, and the subscriber who transmitted the frame with the unique number as a tag for the frame returned after switching is determined, and the transmission of the frame to the corresponding subscriber is determined. Since cancellation is performed, one broadcast resource can be handled by one address resource, and the ability to avoid address busy is improved. In addition, the subscriber who has transmitted the frame does not need to process the frame that returns in vain.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a system to which the present invention is applied.

FIGS. 3A and 3B are diagrams showing the format of a frame transmitted in the exchange, wherein FIG. 3A shows a non-broadcast frame, and FIG. 3B shows a broadcast frame format.

[Explanation of symbols]

 101 switch section 102 frame multiplexing section 103 line correspondence section 105-1,..., 105-3 terminal 310 address area 320 broadcast group identification number area 414 broadcast identifier (ID) 421 broadcast group identification number 431 channel bit map 441 Cancel Channel Bitmap

Claims (1)

(57) [Claims] 1. A broadcast service switch for distributing a broadcast frame among subscribers in a broadcast group of a system for multiplexing and switching frames including communication information from a plurality of subscribers and communication partner identification addresses. Means for pre-assigning a unique number for each subscriber in the broadcast group to an exchange accommodating the plurality of subscribers, and a frame from the subscriber when a broadcast connection to the subscriber is set. a broadcast identifier for identifying whether said a broadcast frame, pairs sends the original subscriber of the broadcast frame
Means for setting a cancel information to respond to receive frames from the subscriber, the frame is determined whether the a broadcast frame based on the broadcast identifier, the subscriber in the case of the broadcast frame It said means for inputting to the switch <br/> switch unit by inserting a unique number to the broadcast frame, the broadcast frames switched by the switch unit corresponding to the user
Is sent to each subscriber in the broadcast group.
To extract the unique number inserted in the frame
In the meantime, the cancellation information is
Means for canceling the transmission of the broadcast frame to the corresponding transmitting source subscriber .