KR930010254B1 - Method of channel controlling a space switch of full-electronics switching system - Google Patents

Abstract

The space switch channel control method in a full electronic switching system having ASS, INS and CCS includes the steps of processing a channel connection demand received from a subscriber's processor, demanding the switch connection to a space switch, and informing of the switching connection at the space switch to the subscriber's processor after the switch connection, so that blocking probability of a channel and channel search time are decreased via a partitioned sequential method to be proximity to real-time processing.

Description

Space Switch Channel Control Method of Electronic Switching System

1 is a block diagram of an electric electron exchanger to which the present invention is applied.

2 is a flowchart of a spatial switch channel control method according to the present invention;

3 is a flowchart of a space switch connection step according to the present invention.

4 is a flowchart of an empty channel search step according to the present invention.

* Explanation of symbols for main parts of the drawings

11: CCS 12: INS

13: ASS 14: ASP

15: TSP 16: INP

17: SSP 18: SSW

19: SNC 20: TSW

21: LSC

The present invention relates to a space switch channel control method for controlling discovery, connection, and release of a space switch channel for a telephone exchange system.

Conventionally, the call path system is composed of a time switch, a time switch, a space switch, a time switch, a time switch, and has a complex structure that passes through an interface between the time switch and the time switch. Iterative search method was used. However, the sequential search method has a problem that the channel blocking probability is small but the search time is long, and the circular search method has a short search time but the channel blocking probability is high. there was.

The present invention devised to improve the above problem is a spatial switch channel control method for reducing the channel blocking probability and channel search time by using the partitioned sequential (Partitioned Sequential) that takes advantage of the sequential search method and the iterative search method The purpose is to provide.

In order to achieve the above object, the present invention provides an subscriber station, a relay line matching device, a time switch, an ASS (Access Switching Subsystem) for performing a call processing function with various signal devices, a space switch function for connecting the ASSs, and a number translation and routing function. The space of the electronic switching system consisting of the INS (Interconnection Network Snbsystem) and the Central Control Subsystem (CCS) that manages system-level operations, maintenance, billing statistics, hard disk management, and I / O devices. A switch channel control method, comprising: a first step of receiving and processing a channel connection request from a subscriber processor, a second step of requesting a switch connection to a spatial switch, and a step of notifying the switch connection to the subscriber process from the spatial switch after the switch connection; It is performed by three steps.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a configuration diagram of an electronic switch in which the present invention is applied, 11 is a Central Control Subsystem (CCS), 12 is an Interconnection Network Subsystem (INS), 13 is an Access Switching Subsystem (ASS), and 14 is an Access Switching Processor (ASP). 15 is a Time Switch Processor (TSP), 16 is an Interconnection Network Processor (INP), 17 is a Space Switch Processor (SSP), 18 is an SSW (Space SWitch or less), 19 is a Switch Network Control (SNC) 20 represents a time switch (TSW) and 21 represents a local service control (LSC).

The electro-electronic exchanger to which the present invention is applied is composed of three subsystems, ASS 13, INS 12, and CCS 11, as shown in FIG.

The ASS 13 is composed of an ASP 14 having an LSC 21 and a TSP 15 having a TSW 20, and performs call processing functions such as subscribers and trunk line matching devices, TSWs, and various signaling devices. .

The LSC 21 in the ASP 14 controls the time switch in conjunction with the TSW 20 in the TSP 15. In the ASS 13, a time switch having a maximum capacity of 8192 timeslots is located, and 16 x 16 space switches are connected to one ASS 13 at a time.

The INS 12 is composed of an INP 16 having an SNC 19 and an SSP 17 having an SSW 18 and located at the center of the system. In charge of translation and routing functions.

The CCS 11 performs system-level operation management, maintenance, billing, statistical functions, and management of a hard disk, an input / output device, and the like.

The subsystem to which the present invention is applied is an INS 12, in which an SNC 19 in an INP 16 controls a space switch in association with an SSW 18 in an SSP 17, and the INS 12 and an ASS 13 The highway connecting) consists of 1024 channels.

2 is a flowchart of a method for controlling a space switch channel according to the present invention, and shows a flow of a call passing through the space switch.

In the case of a call between subscribers belonging to different ASSs 13, the subscriber processor receives a space switch 18 connection request (21). In this block, an empty channel of the 1024 channels of the highway connected to the ASS 13 is found and a space switch 18 connection request is sent to the space switch 18 (22). The space switch 18 sends a connection notification to the calling subscriber processor after making the connection (23). When the channel is released, the subscriber processor makes a release request to the spatial switch 18 (24). The space switch 18 notifies the SSP 17 of the result after the release (25).

3 is a flowchart of a space switch connection step according to the present invention, and shows a flow from receiving a switch connection request from a subscriber processor to sending a channel connection request to a space switch.

When the switch connection request is received in the idle state (31), the state of the line is checked (32). That is, when the line requesting the connection is in use, the channel is disconnected by requesting release of the channel connected to the line to prevent the blocking channel from being accumulated (33).

After the line is idle or the channel is disconnected, the highway is searched for (34). The highway is connected to one ASS 13 and has 1024 channels. The highway searches for idle channels among the channels for the call (35).

Since two information channels are required for a voice call, that is, a sending channel and a receiving channel, when two channels are found, a connection request is sent to the spatial switch 18 (36).

4 is a flowchart of an empty channel search step 35 according to the present invention.

The subhighway refers to 32 channel units obtained by dividing 1024 channels into 32, and a search point is a stored subhighway point to find an empty channel from the search point.

First, the subhighway point at which the channel was last found is found (41). In operation 42, a 32-bit bit is retrieved from the subhighway. That is, if the bit being used is set to '1' and all 32 bits are being used as '1', the next subhighway point is continuously searched until the bit is idle (49).

If there is a bit idle, the state of the point is searched from the first bit point (point 0) to the 32nd bit point (44, 45, 46). If there is no bit idle, the next subhighway is searched (44). If idle, the idle bit point is used as the channel number (47). In other words, the channel number becomes a bit point which is subhighway x 32 + pause. A channel connection request is made to the space switch 18 by the channel number (48).

The present invention constructed and operated as described above is composed of inter-relational data of circuit-to-channel and channel-to-line, and the channel search method is selected in partial sequential method to reduce the blocking probability and search time of the channel so as to approach the real-time processing. There is an effect.

Claims (3)

ASS (Access Switching Subsystem) 13, which performs call processing functions with subscriber and relay line matching device, time switch, and various signaling devices, is responsible for space switch function, number translation, and routing function that connects each other. Electronic exchange consisting of Interconnection Network Subsystem (INS) (12) and Central Control Subsystem (CCS) (11), which performs system-wide operational management, maintenance, billing statistics, hard disk management, and management of I / O devices. A method of controlling a spatial switch channel of a system; A first step 21 for receiving and processing a channel connection request from a subscriber processor, a second step 22 for requesting a switch connection to a space switch 18, and a switch from the space switch 18 to a subscriber process after connecting a switch And a third step (23) of notifying the connection. The method of claim 1, wherein the processing of the channel connection request comprises: searching for a state of a line when receiving a space switch connection request from the subscriber process, and requesting release of a channel connected to the line when in use (31, 32, 33). ), A step (34, 35) of finding the highway and the free channel of the calling party and the called party, and requesting a connection to the spatial switch (36). The method of claim 2, wherein the step of finding an empty channel includes: finding a point of a subhighway (41); searching for whether all 32 bits of the hub highway are in use, and finding a point of the next subhighway if not. Proceed to step (42,49), the step of finding the position of the idle bit of the 32 bits of the subhighway (43, 44, 45, 46), by calculating the channel number according to the idle bit request channel connection to the spatial switch Space switch channel control method, characterized in that carried out by the step (47, 48).