JPS6028346A - Line exchange control system - Google Patents

Abstract

PURPOSE:To process easily the change of a channel assigning system and of the constitution of a time division multiplex switch by the constitution that the function is divided into three blocks; a line control section, channel assignment bus control section and an exchange control section. CONSTITUTION:A line exchange is provided with n-set of line control sections LCU01-LCUn-1n accommodating plural kinds of data terminal devices different in terminal speed and call control procedure and conducting call control in response to the call control procedure of each terminal device, a channel assignment bus control section (CHCTL) conducting the channel assignment with a bearer rate in response to each terminal speed and the switching control of a connection bus, and an exchange control section (EXCTL') 21 conducting all exchange controls other than the controls by the LCU01-LCUn-1n and the CHCTL 30. A CH-CP300 indicates a desired bus connection to an HSW301 and returns a bus connection end response to the EXCTL'21 when the bus of outgoing terminal device -LCU01-HSW300-LCUn-1n- called terminal device is set.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit switching control system, and more particularly to a circuit switching control system in a circuit switching system that interconnects data terminals using a time division circuit switching system.

Conventionally, this type of line switching control system has been configured with a central control system and a communication path system, and line control and channel assignment are performed by all bus control and switching control from the central control system to all communication path system devices. A first method using control and a second method using a block diagram as shown in FIG. 1 are used.

In the figure, the second method involves multiple line control units (hereinafter referred to as L).
It consists of a cU layer cheap exchange control unit (hereinafter referred to as EXCTL) 20.

The LCU has functions distributed for each call control procedure, and the number of lines and lines EX
CTL-CP) 200 and a time division multiplex switch unit (hereinafter referred to as H8W) 201, it receives requests for bus connection and disconnection from the LCU, controls the other side LCU 6, and in the case of call connection, allocates communication channels and results. DeH
Performs 8W opening/closing control.

Terminals accommodated in data exchanges generally have a wide range of terminal speeds from 200bps to 4gKbps, and more recently, data exchanges have been used to accommodate digital telephones (treated as 64Kbps terminals) and high-speed fax terminals (64Kbps terminals). (above) etc. are also accommodated, and the range of speed is expanding. When accommodating these terminals in a circuit exchange, the communication speed allocated within the switching system is called a bearer rate (V-), and the type of bearer rate to be used is determined by considering the traffic conditions of each switching system. Determined by For example, speed 200bpS ~ 48Kbps
- for example, 3.2 Kbps, 12. B
A method having three bearer rates of Kbps and 64 Kbps is conceivable, and as another example, a method in which the bearer rate is unified to 64 Kbps (v-) is also conceivable.

Furthermore, it may be necessary to change the configuration of the time division multiplex switch in accordance with changes in traffic conditions. Furthermore, in addition to the standardized procedures for data terminals, call control procedures include non-standard procedures, such as digital telephone call control procedures and facsimile call control procedures due to the above-mentioned impact, and the number of types of call control procedures is increasing.

However, in the first method, call control and channel allocation, including bus control, are handled entirely by a single central control system, so it is not necessary to add or change new call control procedures or change the method for channel allocation. (adding new bearer rates, changing the correspondence between terminal speeds and bearer rates) and changing the configuration of the time division multiplexing switch requires changing the software in the central control system, so it is not easy to make changes. In the second method, additional changes in the call control procedure can be handled by additional changes to the line control unit, but channel assignments can be handled in response to changes in the method and the configuration of the time division multiplex switch. Similar to method 1, this method has the disadvantage that it is not easy.

Is the purpose of this invention a line exchange? 3 blocks.

In other words, the above-mentioned drawbacks are solved by configuring the line control unit and channel allocation with a bus control unit and a switching control unit, and channel allocation can be easily handled by changing the system and changing the configuration of the time division multiplex switch. The purpose of this invention is to provide a circuit-switched control system with

According to the present invention, in a line exchange that accommodates a plurality of types of data terminals with different terminal speeds and call control procedures and performs line switching, a line control unit that performs call control according to the call control procedure of each data terminal; The channel allocation, which performs the channel allocation of the bearer rate according to the speed of each terminal and the opening/closing control of the connection bus, is performed by the bus control unit, and the line control unit and channel allocation are performed by the bus control unit, which performs all exchange control except for the control performed by the bus control unit. A line switching control system is obtained, which is characterized in that it includes a switching control section that performs the following operations.

Next, the present invention will be explained with reference to FIGS. 2 and 3.

FIG. 2 is a block diagram showing an embodiment of the circuit switching control method of the present invention, and FIG. 3 is a sequence chart showing an example of the control sequence between the blocks in FIG.

In Fig. 2, the line switching equipment accommodates all types of data terminals (hereinafter referred to simply as terminals) with different terminal speeds and call control procedures, and has n line control units that perform call control according to the call control procedures of each terminal. LCUol, ~LCU, tn, the channel allocation for the bearer notes according to the speed of each terminal, and the channel allocation for controlling the opening/closing of the connection are carried out by the bus control unit (hereinafter referred to as CTL) 30 and the LCU (11, ~LC
The exchange control unit (hereinafter EXCTL') performs all exchange controls other than those performed by Un-1n and CHCTL30.
”) 21. The CHCTL 30 is equipped with a channel allocation/processor (hereinafter referred to as CH-CP) 300 and an H
It is composed of SW 301. Note that these LCUs
o 1. ~LCU n-1n, CH-CP 300
Information between EXCTL 21 and EXCTL 21 is transferred via control line 22. LCUol, ~LCUn-1n each support one call control procedure. Also EXCTL'2
1 is the bearer rate determined from the terminal speed, H8W30
We do not have to worry too much about the configuration of In other words, all requests (such as bus occupancy timing and opening/closing control) are made to the CHCTL 30 with a line number attached.The CHCTL 30 responds to this request by determining the parent route, etc. from the line number, and executes the requested operation.

Next, the operation of this embodiment will be explained using FIGS. 2 and 3. First, when the LCU+ (for example, LCUol) accommodating the calling terminal executes the call control procedure associated with the calling and makes a connection request to EXCTL'21 after receiving all the dial information, EXCTL'21 receives the CHCTL30 bus reserve request amount. Let's do it. CH- in CHCTL30
The CP300 issues a bus reserve response based on this request.
When the call is returned to CTL' 21, EXCTL' 21 issues a paging request to LCUj (for example, I, cUn-tn) to which the called terminal belongs. LCUn-IYL sends a call completion response 'i EXCTL' 21
L'21CH-cp300K Sends all bus connection requests to connect all buses in IJ Zarp.

The CH-CP 300 instructs Hs'w3oi to connect the desired path, and connects the originating terminal -L CU o l-H8W 300-
L CUQ-1n - Returns bus connection completion response '1EXcTL' to 21 when the bus of the called terminal is established.

EXCTL'21 issues a connection completion report to the LCU and LCUfl-1n, and both called terminals enter a communication state.

As explained above, the present invention has a configuration in which the functions of the five line control units are divided into three blocks: the bus control unit and the switching control unit, and the channel allocation is performed by changing the method and configuring the time division multiplex switch. Changes in channel allocation can be handled by changing only the bus control section, and the change control section is not affected at all, so that the change processing can be easily carried out.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a conventional circuit switching control method, FIG. 2 is a block diagram showing an embodiment of the circuit switching control method of the present invention, and FIG. 3 is a block diagram showing control between each block in FIG. 2. It is a sequence chart which shows an example of a sequence. In the figure, %L~n...Line control unit (LCU)
. ~LCUn-1), 20, 21... exchange control unit (EXCTL, EXCTL'), 22--... control line, channel assignment for 30- is bus control unit (CHCTL)
, 2001000. , Replacement control unit set? (EXCT
L-CP). 201.301...Time division multiplex switch section (H
8W). 300...Channel allocation is bus control unit processor (CH-CP). Hand 1 Meeting 2 @ To the right person To the Zeno 1

Claims (1)

[Claims] In a circuit switching system that accommodates all types of data terminals having different terminal speeds and call control procedures and performs all circuit switching, the circuit switching equipment includes a circuit control unit that performs call control according to the call control procedure of each data terminal, and a circuit control unit that performs call control according to the call control procedure of each data terminal; The channel allocation is performed by the bus control unit, which performs the channel allocation of the corresponding bearer rate and the opening/closing control of the connection bus, and the line control unit and channel allocation are performed by the exchange control unit, which performs all exchange control except for the control performed by the bus control unit. A circuit switching control method characterized by: