JPH07123093A - Connectionless service executing method for atm switchboard - Google Patents

Abstract

PURPOSE:To miniaturize and decentralize the device by providing individually an information composing device and a conversion memory on a subscriber line and a trunk circuit which are exclusive for each connectionless service. CONSTITUTION:A connectionless service circuit device 2 is provided on an ATM switchboard 1 for each connectionless service-only subscriber line or a connection service-only trunk circuit. At the same time, a connectionless service mixture type circuit device 3 is provided on the switchbaord 1 for each connectionless service mixture type subscriber line or a connectionless service mixture type trunk circuit. These devices 2 and 3 have such constitutions that compose the input cell information into messages through an information composing device part 4, have accesses to a memory device part 6 through an address converting part 5, analyze the incoming telephone numbers included in the messages to turn these numbers into cells, and supply these cells to the switchboard 1 and then transmit them to an incoming subscriber line or an outgoing trunk circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an implementation method for providing a collectionless service in an ATM exchange. ATM (Asynchronous Tran)
The sfer mode (SW) switching technology was agreed by CCITT (International Telegraph and Telephone Consultative Committee), and broadband ISDN (Integrated Serv
As a technology to realize (ices Digital Network), research is actively conducted in each institution. At the ATM switch,
User information is its content (data, voice, image, ...)
Cells are exchanged by a fixed-length packet called a unified cell, and one feature is that information can be transferred at high speed.

SMDS (switched multimeg), which is currently being started in the United States, is a leading service for ATM exchanges.
A service such as a bit data service is a high speed / broadband data communication service that uses a DQDB (distributed queue dual bus) in a cell relay system and is one of connectionless services. Along with this, there is a need in Japan for a technology for realizing a connectionless service on an ATM switch.

[0003]

2. Description of the Related Art The connectionless service is a service in which a connection destination is not set up in advance, and is a method of dynamically switching and connecting in a switch according to a telephone number of a destination called by a subscriber. This is a system in which a device called a connectionless server that provides a reply service is installed, all connectionless cells are temporarily housed in the device, the incoming telephone number is analyzed in the device, and the incoming call is sent to the called side.

FIG. 5 shows a connection configuration diagram of a conventional method of realizing a connectionless service in an ATM exchange. In the figure, 41 is an ATM exchange, 42 is a connectionless server, 43 is a CL (connectionless service) dedicated subscriber line, 44 is a CL service dedicated relay line,
Reference numeral 45 is a CL service mixed type subscriber line, 46 is a CL service mixed type relay line, 47 is an outgoing relay line, and 48 is an in-house incoming subscriber line.

The connectionless server 42 comprises an information assembling apparatus section, an address converting section and a memory apparatus section. The information assembling apparatus section and each connectionless service subscription line are all connected for each service subscription line, The information assembling device unit temporarily accommodates all connectionless cells, the address converting unit analyzes the incoming telephone number, accesses the memory device unit, and performs cell setting from the receiving number to the receiving side, and the ATM switch. Input to the switch of 41 and send to the receiving side terminal.

[0006]

Therefore, the connectionless server must have the data of all the calling subscribers and the called subscribers, and the system becomes huge (for example, 120 subscribers can be accommodated). It will be about 1 rack). Further, since the charging data is also taken in the present system, there is a possibility that the charged cell may be discarded due to cell congestion or the like before passing through the ATM switch and reaching the terminating terminal.

According to the present invention, the information device unit, the address conversion unit, and the memory device unit, which are conventionally provided in common in connectionless servers, are provided for each connectionless service-dedicated subscriber line or relay line to reduce the size of the device in a distributed manner. The purpose is to

[0008]

FIG. 1 is a block diagram showing the principle of the present invention. In the figure, 1 is an ATM switch, 2 is a connectionless service line device, 3 is a connectionless service mixed type line device, 4 is an information assembling device part, 5 is an address converting part, 6 is a memory device part, and 7 is a line branching part. , 8 indicates a billing information storage unit, and 9 indicates a main memory.

The connectionless service line device 2 is
The connectionless service-dedicated subscriber line or the connectionless service-dedicated relay line is connected, and the connectionless service mixed type line device 3 is connected to each of the connectionless service mixed type subscriber line or the connectionless service mixed type relay line. .

The connectionless service line device 2 is
Information assembly device unit 4, address conversion unit 5, memory device unit 6
The connectionless service mixed type line device 3 includes an information assembling device unit 4, an address conversion unit 5, a memory device unit 6, a line branching unit 7, and a billing information storage unit 8. The main memory 9 is a main memory in the ATM switch.

In each of the line devices 2 and 3, the information assembling device unit 4 assembles the input cell information into a message, the address converting unit 5 accesses the memory device unit 6, analyzes the incoming telephone number in the message, and receives the incoming call. The cells are converted to cells on the other side, input to the ATM exchange 1, and sent to the destination subscriber line or outgoing relay line. For an incoming call from the ATM switch 1, the information assembling device unit 4 and the billing information storage unit 8
The billing information is stored for each service subscription line.

The connectionless service mixed type line device 3 identifies the connectionless service subscription line or the general service non-subscriber line by the line branching unit 7, and if it is the general service non-subscriber line, the ATM switch 1 is selected. If it is a connectionless service subscriber line by directly inputting it and performing ordinary ATM exchange, the incoming telephone number is analyzed from the information assembling device unit 4, the address converting unit 5, and the memory device unit 6 to the receiving side. Cellization of.

Each line device 2 and 3 has a main memory commonly provided in the ATM switch 1 when the incoming telephone number information of the input cell is not in the memory device section 6 in each line device. There is a method for making a connectionless service by inquiring 9 and loading necessary data into each line device.

[0014]

2 is a flow chart showing the operation of the connectionless service line device 2. In the figure, in the case of the upstream direction, (1) All input connectionless cell information is once assembled into a message (packet information). (2) Analyze the called party's phone number in the message, access the memory (on the memory), (3) search the cell information corresponding to the called phone number, and (4) search when returning to the ATM cell The result is overwritten on the cell header and sent to the ATM switch (5).

Next, in the case of the downstream direction, (6) the cell information input from the ATM switch is once assembled into a message, and (7) the incoming telephone number of the message is analyzed and the billing information is set. (8) The billing information of the message is stored in the billing memory for each incoming telephone number and sent to the subscriber side.

[0016]

FIG. 3 shows the first embodiment of the block diagram of the connectionless service line device of the present invention. Figure 3 (a)
Shows a connectionless service line device corresponding to a connectionless service dedicated subscriber line or a trunk line, and FIG. 3B shows a connectionless service mixed type line device corresponding to a connectionless service mixed subscriber line or a trunk line. Show.

In the figure, 11 is a connectionless service line device, 12 is a transmitting side information assembling device section, 13 is an address converting section, 14 is an address converting memory, 15 is a group address converting memory, and 16 is a receiving side information assembling apparatus section. , 17 is a charging information storage unit, 18 is a charging memory, 21 is a connectionless service mixed type line device, 22 is a mixed type line branch unit, and 23 is a branch memory.

The ATM switch divides a digital signal into 48 bytes (1 byte is 8 bits), attaches a 5-byte header including a destination number, etc., and multiplexes or switches a cell consisting of 53 bytes in total. Is to do. The cell header is composed of two identifiers such as VC (virtual channel) and VP (virtual path), and the like. VC is assigned at call setup, and VP is used for identification of service and identification of ground. The tag information indicates outgoing line information for routing.

In FIG. 3 (a), a connectionless service line device 11 is provided on each connectionless dedicated subscriber line and relay line, and the input side cell information assembling unit 12 assembles the input cell information into a message, The address conversion unit 13 analyzes the destination telephone number in the message, accesses the address translation memory 14, searches for the VPI, VCI, and tag corresponding to the destination telephone number (DN), and returns it to the ATM cell. Sometimes, the retrieved result is overwritten on the header and output to the ATM-SW.

When the destination DN has a group address, the group address conversion memory 15 is accessed to retrieve the cell information corresponding to the destination DN and assign it to the ATM cell. Further, the cell input from the ATM-SW is once assembled into a message by the receiving side information assembling apparatus section 16, the charging information storage section 17 analyzes the incoming DN and sets the charging information, and the charging information is stored in the charging memory 18. Is stored and sent to the subscriber side.

In FIG. 3B, when a cell for connectionless and a cell other than that are mixed in the input cell from the subscriber side, the connectionless service mixed type line device.
The VPI and VCI of the cell from the subscriber side are checked by the mixed line branching unit 22 and the branch memory 23 provided in 21 and the VPI and VCI values for the connectionless service preset by the call processor are stored. The branch memory 23 that is being accessed is accessed.

Same VPI, V by memory access
If the CI exists in the memory 23, the cell is determined to be a connectionless cell, the input cell information is once assembled into a message by the same process as in FIG. 3A, the destination DN is analyzed, and the memory is accessed. It is added to the ATM header by the cell assembling device and sent to the ATM-SW. Similarly, the cell from the ATM-SW is subjected to processing such as billing and then sent to the subscriber side.

FIG. 4 shows a second embodiment of the block diagram of the connectionless service line device. The figure is AT
In this method, one main memory for collectively managing the data of all connectionless subscribers is provided in the M-SW to assist the memory load of each line device. 4A shows the case of a connectionless service line device, and FIG. 4B shows the case of a connectionless service mixed type line device.

In the figure, 31 is a connectionless service line device, 32 is a transmitting side information assembling device section, 33 is an address converting section, 34 is an address converting memory, 35 is a main memory,
36 is a connectionless service mixed type line device, 37 is a mixed type line branch unit, and 38 is a branch memory. The figure omits the processing of downlink cells.

Each line device 31, 36 makes an inquiry to the main memory 35 in the ATM-SW when the received cell phone number (DN) information of the cell is not in the memory in each line device, and it is necessary. It is a method to realize connectionless service by loading various data into each line device. If there is a free space in the address translation memory 34 in each line device, each memory can be updated by deleting the oldest data and writing new data.

[0026]

As described above, according to the present invention, the size of the memory can be increased by storing in the memory only the data of the called subscriber who is to be connected by the subscriber accommodated in each service line device. The size can be reduced and provided for each service line device. In addition, since charging is done at the end,
There is no problem such as discarding charged information.

If it is desired to further reduce the memory size, one main memory is provided in the switch, and when information that is not in the memory is needed, the main memory is accessed at that time to provide service lines. The memory in the device can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of the principle of the present invention.

FIG. 2 is an operation flowchart of the present invention.

FIG. 3 is a block diagram of the first embodiment.

FIG. 4 is a block diagram of a second embodiment.

FIG. 5 is a configuration diagram of an implementation method of a conventional example.

[Explanation of symbols]

 1,41 ATM switch 2,11,31 Connectionless service line device 3,21,36 Connectionless service mixed type line device 4 Information assembly device part 5,13,33 Address conversion part 6 Memory device part 7 Line branch part 8, 17 Billing information storage unit 9,35 Main memory 12,32 Calling side information assembling device unit 14,34 Address conversion memory 15 Group address conversion memory 16 Calling side information assembling device unit 18 Charging memory 22,37 Mixed line branch unit 23, 38 Branch memory 42 Connectionless server 43 CL service dedicated subscriber line 44 CL service dedicated relay line 45 Mixed service type subscriber line 46 Mixed service type relay line 47 Outgoing relay line 48 In-house incoming subscriber line

Claims (4)

[Claims] 1. An ATM exchange 1 is provided with a connectionless service line device 2 for each connectionless service dedicated subscriber line or connectionless service dedicated trunk line, and in the line device 2, an input cell information is input by an information assembling device section 4. Is assembled into a message, the memory device unit 6 is accessed by the address conversion unit 5, the incoming telephone number in the message is analyzed, and the incoming telephone number is converted into cells.
A method for realizing a connectionless service in an ATM exchange, characterized by inputting to an exchange 1 and transmitting to a destination subscriber line or an outgoing relay line. 2. An ATM exchange 1 is provided with a connectionless service mixed type line device 3 for each connectionless service mixed type subscriber line or connectionless service mixed type trunk line, and the mixed type line device 3 has a line branching unit. 7 identifies the connectionless service subscriber line or the general service non-subscriber line, and if it is the general service non-subscriber line, it is directly input to the ATM switch 1 to perform normal ATM exchange and join the connectionless service. If it is a private line,
A connectionless service realization in an ATM exchange, characterized by analyzing an incoming telephone number from the information assembling device unit 4, the address converting unit 5, and the memory device unit 6 according to claim 1, and converting the incoming telephone number into cells. Method. 3. The line device 2 or the mixed line device 3
In, instead of putting all the information of the incoming call in the memory device unit 6,
Part of the incoming call information is stored in the memory device unit 6, the incoming telephone number is analyzed, and if there is no corresponding information, the main memory 9 in the ATM switch 1 is accessed and stored in the memory device unit 6. 3. The method for realizing a connectionless service in an ATM exchange according to claim 1, wherein 4. The line device 2 or the mixed line device 3
In the case of newly writing information from the main memory 9 to the local memory device unit 6, the time when the memory device unit 6 is accessed according to the input information is written in the memory device unit 6, and the oldest accessed information is stored in the memory device unit 6. 6. The method for realizing a connectionless service in an ATM exchange according to claim 3, wherein the connectionless service is deleted.