KR930007803B1 - Method of housing a multi-slot call of t-s-t switching network - Google Patents

Abstract

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Description

Multislot Call Acceptance Method of T-S-T Type Switching Network

1 is a block diagram of a hardware system to which the present invention is applied.

2 is a software operation diagram according to the present invention.

3 is a flowchart of a multi-slot call receiving method according to the present invention.

* Explanation of symbols for main parts of the drawings

1: T-S-T type switching network with double buffer configuration

2,3: Time switch of double buffer

4: time multiplexing space switch

5: switching network control processor

6: switching network control function

11: Time slot use status table of originating time switch

12: Time slot use status table of incoming time switch

13: temporary register

The present invention relates to a method for accommodating a multi-slot call in a time-space-time (TST) type switching network having a double buffer configuration, and in particular, one call when searching for a call. The present invention relates to a multi-slot call acceptance method that varies the number of searches according to the required number of timeslots.

In the Integrated Services Digital Network (ISDN), an n × 64 Kbps circuit-switching scheme that allocates n timeslots for a call to accommodate both narrowband and midband services must be realized. That is, H ₀ channels (384 Kbps, 6 timeslots) for video conferencing, H ₁₁ channels (1.56 Mbps, 24 timeslots) and H ₁₂ channels (1.920 Mbps, 30 timeslots) for high-speed data services. Should be provided.

In the existing T-S-T type switching network, the same number of searches is given to each type of call to accommodate multiple slot calls. However, this method has a problem that it is difficult to satisfy the service quality due to a large blocking probability for calls requiring a large number of timeslots and lowers the throughput of the entire switching network.

The present invention devised to solve the above problem is to provide a priority for a call requiring a large number of timeslots when a multi-slot call is to be accommodated in a double buffered TST type switching network. The purpose of the present invention is to provide a multi-slot call accepting method that satisfies the quality of service, improves the yield of the switching network, and reduces the load of the switching network processor (hereinafter referred to as "SNP"). There is this.

In order to achieve the above object, the present invention is connected to a plurality of originating double buffer time switches and multiple originating call double buffer time switches to perform an exchange function for each timeslot and is inputted from the originating double buffer time switch. TST-type switching network comprising a double-buffered time-space-time (TST) switching network configured with a time-multiplexed spatial switch that spatially exchanges time slots with each incoming time switch, and a TST switching network control processor. In the multi-slot call acceptance method, when a call requiring any number of timeslots from a subscriber or incoming line occurs, the time slot usage state table of the originating time switch within the timeslot search number starting from any time slot position Compare and compare empty timeslots in the same slot position. A first step of checking whether the number is a predetermined number; a second step of terminating and causing a call loss when the number of timeslots vacant in the same slot position is smaller than the predetermined number even if the number of timeslots is searched. A third step of storing position information of each timeslot in a temporary register when the number of empty timeslots in the same slot position within the number of slot searching times corresponds to any number of position information stored in the temporary register; A fourth step of changing the time slot use state of the time slot use state table of the call origination time switch to the busy state and maintaining the busy state; and upon receiving a call release request from the subscriber or the incoming line, Time slot of the time slot use status table of the incoming / outgoing time switch corresponding to any stored position information A fifth step is performed by a change in the used empty state.

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

1 is a configuration diagram of a hardware system to which the present invention is applied, 1 is a double buffered TST type switching network, 2 and 3 are double buffered T-switches, and 4 is a time multiplexed spatial switch. -Muxed S-switch (5), 5 represents a Switching Network Processor (SNP), 6 represents a Switching Network Control Function (SNC).

The hardware system to which the present invention is applied is composed of a T-S-T type switching network 1 and a switching network control processor 5 having a double buffer configuration as shown in FIG.

The double buffered TST type switching network 1 includes a plurality of outgoing double buffer time switches 2 and a plurality of incoming double buffer time switches 3 that perform an exchange function for each time slot, and the respective outgoing and outgoing calls. It is composed of a time multiplexing space switch (4) connected to the time switches (2, 3) for spatially exchanging time slots from each originating time switch (2) to each incoming time switch (3).

The T-S-T type switching network control processor 5 having the double buffer configuration is configured and operated by the switching network control function unit 6 on which the present invention is mounted.

The switching network control function unit 6 manages the entire T-S-T type switching network in a double buffer configuration and performs a function of allocating and retrieving timeslots necessary for establishing or releasing a call.

2 is a software operation diagram according to the present invention, where 11 is a time slot use state table of the originating time switch (hereinafter referred to as "TSUST"), 12 is TSUST of the incoming time switch, and 13 is a temporary register.

Referring to FIG. 2, a process of allocating a time slot required for setting a call by comparing a time slot use state table of an originating time switch and an incoming time switch is as follows.

The SNC searches for an idle time slot in the same slot position by comparing the time slot use state table 11 of the originating time switch and the TSUST 12 of the incoming time switch, starting at an arbitrary slot position. . Since the position information of the time slots empty in the same slot position in the TSUST 11 of the originating time switch and the TSUST 12 of the incoming time switch is Addr + 1, Addr + 4, and Addr + 6, this information is stored in the temporary register (13). Save to and assign the timeslot required to set the currency.

3 is a flowchart of a multi-slot call accepting method according to the present invention.

Referring to FIG. 3, the method for receiving a multi-slot call according to the present invention realized by the SNC until the call requesting the multi-slot is generated and released is as follows.

When a call requesting n timeslots from the subscriber or the incoming line occurs (21), the SNC reads the TSUST of the originating time switch and the incoming time switch (22). Next, the number of time slot search times for a call requiring n timeslots (hereinafter referred to as "NSCH (n)") is read (23). Thereafter, starting at an arbitrary slot position, the TSUST of the originating time switch and the terminating time switch is compared within the NSCH (n) to determine whether there are n idle time slots in the same slot position (24). If the number of timeslots in the same slot position is smaller than n even if the number of timeslots is searched for NSCH (n), the call ends (31). In addition, when the number of timeslots empty in the same slot position in the NSCH (n) reaches n, the position information for each timeslot is stored in the temporary register (25). The time slot use state of the TSUST of the origination time switch and the incoming time switch corresponding to the n position information stored in the temporary register is changed to a busy state (26). In this way, a call requiring n timeslots establishes a call path in the switching network, thereby maintaining a busy state (27). When a certain time has elapsed and a call release request is received from the subscriber or the incoming line (28), the time slot use state of the TSUST of the originating time switch and the incoming time switch corresponding to the n position information stored in the temporary register is left empty. A switch 29 is made available when the next call occurs and ends.

The present invention, which is configured and operated as described above, lowers the call loss rate for the call by giving priority to calls requiring a large number of timeslots, thereby improving the quality of service and improving the yield of the switching network as a whole. Since the number of timeslot search is limited for a call that requires, there is an application effect to reduce the load of the SNP.

Claims (1)

Outgoing double buffer time switch (2) connected to a plurality of outgoing and outgoing double buffer time switches (2, 3) and the outgoing and outgoing double buffer time switches (2, 3) to perform an exchange function for each timeslot (2). TST (Time-Space-Time) type switching network 1 consisting of a time multiplexing space switch 4 for spatially exchanging timeslots input from the respective destination time switches 3, and TST A method for receiving a multi-slot call in a TST type switching network including a type switching network control processor (5); If a call requiring any number of timeslots from the subscriber or incoming line occurs, the time slot use status table of the call originating time switch is compared to the same slot location starting from any time slot location and within the timeslot search frequency. A first step (21, 22, 23, 24) of checking whether an idle timeslot becomes the random number, and if the timeslot is searched by the number of timeslots, the timeslots empty at the same slot position are random numbers. If smaller than step 2, the call loss occurs and ends, and if the number of timeslots vacant in the same slot position within the number of timeslots is searched, the position information for each timeslot is stored in a temporary register. In the third step (25), the time slot use state table of the origination and reception time switch corresponding to any number of position information stored in the temporary register Fourth steps (26, 27) of changing the busy state from busy slot to busy and maintaining a busy state, and any number of positions stored in the temporary register upon receiving a call release request from the subscriber or the incoming line. And a fifth step (28, 29) of changing the timeslot use state of the timeslot use state table of the call destination time switch corresponding to the information into an empty state.