JPH0397334A - Asynchronous transfer mode switching system - Google Patents

Abstract

PURPOSE:To decentralize the load and to improve processing capability by providing a virtual channel identifier on the heater part of a packet, providing a signal identifier identifying whether the packet is a user information packet or a signal packet on a part of the virtual channel identifier and applying exchange connection based on the signal identifier. CONSTITUTION:A heater part 101 is constituted of an exchange processing section 1011, a virtual channel identifier VCI012 constituted of 24-bit and additional information section 1013. The VCI2 is constituted of a call identifier 10121 composed of 22-bit and a signal identifier 10122. The signal identifier 10122 identifier whether the packet is a user information packet carrying user information or a signal packet carrying signal information for switching connection of the user information packet. Thus, the call identifier is included as the virtual channel identifier of the signal cell relating to call connection to share the signal cell to other processor at every call. Accordingly, the load for the signal processing and the call processing is decentralized efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an asynchronous transfer mode switching system, and more particularly to an asynchronous transfer mode switching system that allocates packets.

[Conventional technology]

Generally, in an asynchronous transfer mode (hereinafter referred to as ATM) switching system, all user information and control information are transferred as fixed-length packets (hereinafter referred to as cells). Each cell has a virtual channel identifier (hereinafter referred to as VC) for identifying the type of information carried by the cell and call identification.
(referred to as I) is always included. Furthermore, no exact method has yet been established for assigning vC■.

For example, for telephone calls, a method of assigning one VCI is generally considered. Regarding signal information, one VCI for signal information is set between stations connected by adjacent ATM transmission lines, and all signal packets sent and received between the stations have this VCI. There are ways to do this.

[Problem to be solved by the invention]

By the way, in the case of the above-mentioned method, one ATM transmission medium is currently assumed to be 156 (Mb/s). The capacity of this ATM transmission medium is simply 64[k b /
s), there are more than 2,000 channels, and if we also perform voice silence compression, etc., we have a capacity of more than 4,000 channels, which is double the channels mentioned above. In order to transmit and receive signals for 2,000 to 4,000 channels using one VCI, packet distribution and multiplexing processing must be performed by one signal transmitting and receiving device at the transmitting station/receiving station. Problems such as insufficient processing capacity may occur.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide an asynchronous transfer mode exchange system in which load distribution is achieved and processing capacity is improved.

[Means to solve the problem]

The asynchronous transfer mode switching system of the present invention performs self-routing within a switch network based on the packet's routing information when a packet consisting of a header section containing routing information indicating a connection destination and an information section carrying information is input. In this asynchronous transfer mode switching system, a packet has a virtual channel identifier in its header, and a part of the virtual channel identifier in parentheses contains a user information packet carrying user information or a user information packet. A signal identifier is provided to identify a signal packet carrying signal information to be exchanged and connected, and when a packet is input, exchange and connection is performed based on the signal identifier.

〔Example〕

Hereinafter, the present invention will be explained with reference to the drawings.

1 to 3 are diagrams for explaining the present invention. Here, FIG. 1 is a block diagram showing an embodiment of the asynchronous transfer mode exchange system of the present invention. FIG. 2 is an explanatory diagram showing a cell configuration used in the same embodiment.

First, the cell configuration used in the embodiment of the present invention will be explained with reference to FIG.

One cell 100 includes a 6-byte header section 101 and 3
It consists of a 2-byte information section 102. The information section 102 is a user information cell. For example, information such as audio information and video telephone images is included in the cell, and in the case of a signal cell, signal information is included. The header section 101 includes an exchange processing section 1011 configured with 16 bits,
Virtual channel identifier (VCI) consisting of 24 bits
101■ and an additional information section 1013 consisting of 8 bits.
It is composed of. The additional information section 1013 is not directly related to the present invention, so its description will be omitted below. The exchange processing unit 1011 is a part that is used only for the purpose of cell routing within one exchange, and is not transferred between exchanges. The 1-byte input terminal number lOl. and a 1-byte output terminal number 10112 indicating the output terminal number. VCIIO1
2 is a call identifier 101z, consisting of 22 bits, and 2
The signal identifier 1012 is made up of bits.

Is the signal identifier 101=2 a user information packet carrying user information or a signal bucket carrying signal information that exchanges and connects this user information packet? In this embodiment, for example, in the case of user information, “0” is used.
"0", "0"l" in the case of a signal cell, "1"
'“0” and “1” and “1” are not used.

Next, an embodiment of the asynchronous transfer mode switching system of the present invention will be described based on FIG.

The asynchronous transfer mode switching system shown in FIG.
,12,...,1. ．． , station 2, and ATM transmission lines 3, 3■, . . . that connect these. 3
, and is configured as follows. That is, when the asynchronous transfer mode switching system receives a packet 100 consisting of a header part 101 containing route information indicating a connection destination and an information part 102 carrying information as shown in FIG. It is configured to perform self-routing within the switch network based on route information.

Here, the station 2 has header operating units 2 1+, 2 h.
. . . , 21, an ATM switch network 22, and a processor 2 31, 2 L .・Old..., 23
, and the connection circuits 24,, 24■.・・・・・・・・・2
4o.

Header operation section 21, 212, ..., 21
, is the other station 1,,l2,...,1. ATM transmission line extending to 3. , 32. ......,31
This section is located between the cell 100 and the own station 2, and performs a conversion operation on the contents of the header section 101 of the cell 100 shown in FIG. A.T.
The M switch network 22 connects the cells 100 to . This cell 10 according to the output terminal number 101+- included in the base section 101
0 to its designated output terminal.The ATM switch network 22 is a single-path self-routing switch, and for example, a known batch network may be used. .In addition, processors 2 3, . 2 32 . . . 23h
is the circuit 241, 242 connected to ATM switch 1!22
, . . . , 24o.

■,■',... in the figure. ■、■′、■′ is A
The signal is transmitted from station l1, passes through station C2, and goes to station B l,1.
VC1101 used when two telephone calls are connected
2 is shown. Also, the solid line ■, ■′? ′、■、■′、
■' indicates VC1 1 0 12 for user information cells, and broken lines ■, ■', ■, ■', ■, ■', ■, ■' indicate VCIIOI ■ for signal cells. Also, in the diagram *
Marks indicate unused parts.

The operation of the embodiment configured in this way will be explained.

FIG. 3 is an explanatory diagram showing how the header section changes during the operation of the above-described embodiment, and the changes in the header section in each route (1) to (2)' are indicated by the same reference numerals.

First, at a certain point, the A station 11, the A station 11, the C station 1, etc.
Header part 101 of cell 100 that is not used for
VCIIOI ■ Using “a”, call signal cell 1
00 to C station 2 (route ■, in FIG. 3).

Header operation section 21 of C station 2. is an unused VC
When the signal cell 100 containing I 1 0 1a is received from another station l1, the processors 23, 232, . . .
..., 23,, (in this embodiment, processor 23, is selected), and its output terminal number t
3. and its input terminal number tri are written in the cell 100 and sent to the ATM switch 11522 (route ■', Fig. 3 ■'). As a result, the ATM switch network 22 performs a connection operation to form the route (2).

When the processor 23 receives the cell 100, it sends a signal for the call to the A station h (route ■, FIG. Input terminal number t. is connected to form routes ① to ②'.

Further, the processor 23. analyzes the call signal in a manner similar to a conventional electronic switch to determine the outgoing terminal of the call. In this embodiment, the output terminal number of the output route is terminal number t2
. It is. The processor 231 connects the B station 1 through the route ■.
．． The ATM switch network 22 sends the cell 100 toward (route ■, FIG. 3 ■).

Here, the header operation unit 21 operates on a cell 100 including a processor 231 and an unused VCI 101z ("a").
When receiving the
"a" is converted to "X'" and sent to B station 1 (route ■', FIG. 3, ■'). From now on, header operation section 2
1 performs conversion between X and a for the cell 100 of the call.

Then, the B station 11 sends a confirmation signal to the C station 2 (route ■, FIG. 3 ■). Header operation section 21. teeth,
Regarding the call cell 100, the conversion between X and a is performed, and an output terminal input terminal number is assigned to the processor 23. (route ■', Fig. 3 ■').

Then, the processor 231 sends the output terminal number of the user information cell of the call to the header operating unit 21 through a path not shown in the figure as t2. Similarly, the header operation unit 21 is also notified that the output terminal number of the call is tea.

Thereafter, the A station h 1 and the B station 11 will be connected via the routes ■, ■'■' and the routes ■, ■', ■'.

Note that in the embodiment described above, the header section 101 of the cell 100
Although the system has a part called an exchange processing part which is not used between stations, the present invention is not limited to this.

〔Effect of the invention〕

As explained above, in the present invention, by including a call identifier as a VCI in a signaling cell related to a call connection, the signaling cell can be distributed to a different processor for each call, so that the load distribution of signal processing and call processing is improved. It has the effect of being efficient.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing cells used in the embodiment, and FIG. 3 is a diagram for explaining the operation of the embodiment. 1,. 1. , ......, 1, 2...... station, 31+32+... 3yo...ATM
Transmission line, 21, . 21. ．． ......,21,・
...Header operation unit, 22...ATM switch network, ...Processor.

Claims (1)

[Claims] An asynchronous transfer mode exchange configured to perform self-routing within a switch network based on the route information of the packet when a packet consisting of a header part containing route information indicating a connection destination and an information part carrying information is input. In the system, the packet includes a virtual channel identifier in the header part, and a part of the virtual channel identifier includes a user information packet carrying user information or a signal packet carrying signal information for exchanging and connecting the user information packet. 1. An asynchronous transfer mode switching system characterized in that a signal identifier for identifying a packet is provided, and when the packet is input, an exchange connection is made based on the signal identifier.