RU2766437C1 - Method of processing information on emergency situations by switching equipment - Google Patents

Abstract

FIELD: communication engineering.

SUBSTANCE: invention relates to communication engineering, namely, to control of call processing process in switching stations at their considerable overloads. Disclosed is a method of processing information on emergency situations with switching equipment, which includes receiving and recording calls from subscribers. If the traffic Y(t) exceeds the predetermined threshold Y0, the emergency mode is introduced in the operation of the switching equipment and messages are sent to subscribers. According to the method, calls from subscribers in this case are processed in series in two steps, at the first step, the conversation time is limited to a predetermined value of T, which is notified to the subscriber through an automatic informer. If this operation does not lead to the desired result, that is, there is no reduction in the load Y(t) to the predetermined threshold Y1, then the value of T is halved.

EFFECT: increased share of serviced load and, as a result, reduced probability of failure in making calls.

3 cl, 4 dwg

Description

The present invention relates to communication technology, namely, to the control of the call processing process in exchange stations during their significant overloads.

When extraordinary events occur (explosion, major fire, etc.), many subscribers (at least 50%) who feel the consequences of the incident begin to create an additional load on the switching stations using telephone sets. As a result, a sharp increase in the number of calls is formed, which leads to an overload of switching equipment and linear structures. For this reason, a significant part of subscribers are denied call service, including the ability to contact emergency operational services. In such situations, it is necessary to control the process of servicing the load in order to minimize the probability of connection failure and maximize the percentage of calls served.

Currently, there are three main ways to reduce the load. The first way is to use bypass directions [1, 2], which allows you to direct the excess load through other switching stations. The second method involves the introduction of service priorities [3, 4] for a certain group of users. The third method is based on indirect methods of limiting the load [5], which involves sending information messages to potential subscribers about plans to eliminate the negative consequences of extraordinary events through the media (radio and television broadcasting), as well as sending SMS or notification through social networks.

The first method cannot be used in concentrators, as well as in switching stations of rural networks, since their connection to the next hierarchical level of the telecommunications network is carried out according to the "point-to-point" principle. In addition, this method is not universal in terms of switching technology (channels or packets). The practical difficulty in implementing workarounds is also due to the fact that it is necessary to introduce changes in the software of equipment from different manufacturers. In this case, it is necessary to implement a complex control system that coordinates the principles of operation of all switching stations located at the same hierarchical level of the telecommunications network.

The second method is difficult to implement for a telecommunications network built on equipment from different manufacturers. It does not allow the implementation of fair (egalitarian) service algorithms, and also does not take into account the migration of subscribers due to a change in place of residence or transfer to another job.

The third method does not allow to achieve the desired effect in a short time. In addition, a number of channels for transmitting the necessary information are not used, for example, at night. In particular, TVs and radios are usually turned off. SMS transmission at night is carried out in full, but not all subscribers, some of whom are in a stressful state, pay attention to the information received.

Also known is the patent of the Russian Federation No. 130110, publication date 10.07, 2013 "SYSTEM FOR PROCESSING INFORMATION ABOUT EMERGENCY SITUATIONS". The way described in this patent for processing information about emergencies by switching equipment, as the closest to the one proposed in terms of the totality of essential features, was adopted by the authors as a prototype.

In a known method, when the number of subscriber calls increases by two or more times compared to a predetermined value, an emergency mode is introduced. In accordance with this, it is further determined whether the subscriber is in the emergency zone, then the subscribers are divided into 2 groups - those in the emergency zone and those outside this zone. Further, the connection is made on the basis of the "through one" rule, the essence of which is that one call is skipped from the queue, which is formed by subscribers who called from the large-scale emergency zone, and then one call from subscribers from another territory.

If the subscriber is in the emergency zone, then the subscriber is sent a message that the call center is already aware of a large-scale emergency. If he does not have important information regarding this emergency, then you should hang up. Otherwise, it is advisable to wait for the operator's response, if the subscriber's response is negative (there is important information to report), then the call is moved from the end of the queue to its beginning.

When the intensity of calls decreases, the changed situation is fixed and the system is transferred to normal mode.

This method does not allow to achieve the desired effect in a short time, and also requires the installation of additional equipment in the form of a number of blocks listed in RF patent No. 130110.

The current technical problem is the lack of a simple, reliable and switching technology-independent way of processing emergency information by switching equipment. It is to solve this problem that the creation of the present invention is directed.

The objective of the present invention is to develop a method of processing information about emergencies that is independent of the switching technology, which makes it possible to reduce the load with a sharp increase in the number of calls.

The technical result consists in increasing the share of the served load and, as a result, reducing the probability of failure in making calls.

To achieve the specified technical result, it is proposed to sequentially implement two procedures in hubs and/or switching stations, in which a sharp increase in traffic begins. The first procedure is to limit the conversation time to a predetermined value T (usually one minute), about which the subscriber is notified through the autoinformer. This operation is performed under the condition that the traffic Y(t) exceeds a predetermined threshold Y ₀ . If this operation does not lead to the desired result (reducing the load Y(t) to a predetermined threshold Y ₁ ), then the value of T is halved. If Y(t)>Y ₁ , then the second procedure is used. It introduces for each subscriber who has completed the conversation a pause of duration τ (about 10 seconds) until the next attempt to establish a connection is possible. The subscriber is also notified about this through the autoinformer. If this procedure does not reduce the load to the threshold Y ₁ , then the value of τ doubles. Further changes in the values of T (reduction) and τ (increase) are not possible, since the permissible conditions for the quality of the functioning of the telephone communication system are violated from the point of view of subscribers.

The essence of the proposed method and evidence of the effectiveness of the proposed solutions are illustrated by the following figures.

In FIG. 1 shows the algorithm for implementing the first procedure.

In FIG. 2 shows the algorithm for implementing the second procedure.

In FIG. 3 shows the dependence of the probability of denial of service on the duration of the conversation.

In FIG. 4 shows the dependence of the probability of denial of service on the duration of the pause between attempts to call from one terminal.

The threshold Y ₀ is the so-called specific (the value of the intensity of the load Y (f) in the hour of the greatest activity of subscribers, divided by the number of service devices V) load "A", determined by the recommendation of the Standardization Sector of the International Telecommunication Union Q.543 [4] value 0.7 . The value of Y ₀ can be chosen as the value of 0.8, defined by the same recommendation Q.543 [4] as the specific load "B", if such a value was chosen as a result of the design documentation for the switching equipment. As a threshold Y ₁ it is appropriate to choose a specific load equal to 0.95. The values of Y ₀ and Y ₁ should be considered as preliminary values that can be changed as a result of processing the accumulated statistical data and their subsequent analysis.

The algorithms shown in Fig. 1 and FIG. 2 present the proposed load reduction procedures as a set of necessary operations.

Fig. 3 illustrates the change in the probability of denial of service p before and after the occurrence of an extraordinary event. For the stage "After the occurrence of an extraordinary event", occurring at time t _x , the values of the probability p are shown, which are determined by limiting the conversation time to T and 0.57 ", respectively.

To calculate the probability p, a model with the following characteristics was used: the number of subscribers N = 200, the capacity of the set of service devices (connecting lines) V = 30, one subscriber creates a load equal to 0.1 Er l, after the occurrence of an extraordinary event, 50% of subscribers become active . The calculation of p values was carried out using the Erlang and Engset formulas [6], which gave the values of the probability p differing by several percent. For this reason, in Fig. Figure 3 shows the results of the calculation using the Erlang formula [6]:

The results of the calculations, presented in the form of a histogram, testify to the high efficiency of the procedure, which is based on the limitation of the talk time.

Fig. 4 illustrates the change in the probability of a successful call attempt q before and after the occurrence of the extraordinary event. By definition q=1-r. The results were obtained by simulation in the AnyLogic environment [7]. The characteristics of the model were chosen to be the same as in the Erlang formula calculation for constructing the histogram, which was shown in Fig. 3. It is assumed that an extraordinary event occurs at the time t _x =0.

For the stage "After the occurrence of an extraordinary event", occurring at time t _x , pauses are introduced at times t _τ and t _2τ, respectively. The simulation results presented in the form of a histogram testify to the high efficiency of the procedure, which is based on the introduction of pauses between call attempts for each subscriber.

Thus, the proposed method allows to significantly reduce the load with a sharp increase in the number of calls generated by the reaction of subscribers to extraordinary events. It differs from the known solutions in that, firstly, it does not require the intervention of the entire telecommunications network management system, secondly, it does not provide for the use of additional hardware and software, and thirdly, it allows to provide a high level of accessibility to the telecommunications network with a slight decrease in conversation parameters (duration and small pauses between attempts to establish a connection). This allows you to maintain the quality of service of voice traffic at the highest possible level in terms of the minimum failure in establishing connections.

List of sources used

1. Dymarsky Ya.S., Krutyakova N.P., Yanovsky G.G. Management of communication networks: principles, protocols, applied tasks. - M.: Mobile communications, 2003, 384 p.

2. Goldstein B.S., Sokolov N.A., Yanovsky G.G. Communication networks. - St. Petersburg: BHV, 2010, 400 p.

3. Engineering an Operations in the Bell System / Prepared by Member of the Technical Staff and the Technical Publication Department AT&T Bell Laboratories; R.F. Ray, technical editor. - AT&T Bell Laboratories, Murray Hill, N.J., 1983, 884 p.

4. ITU-T. Digital exchange performance design objectives. Recommendation Q.543. - Geneva, 1993, 40 p.

5. Kabanov M.V., Levakov A.K., Pinchuk N.V., Sokolov N.A. Evaluation of methods for reducing telephone traffic generated by the reaction of subscribers to an event. - Bulletin of communications, 2015, No. 2, p. 12-15.

6. Stepanov S.N. Theory of teletraffic: concepts, models, applications. - M.: Hot line - Telecom, 2015, 867 p.

7. Antonova P.V., Titovtsev A.S., Shukurov E.R. Simulation modeling in the Anylogic environment. - M.: Lambert, 2019, 244 p.

Claims (3)

1. A method for processing information about emergencies by switching equipment, including receiving and fixing calls from subscribers, if the traffic Y(t) exceeds a predetermined threshold Y0, enter the emergency mode in the operation of the switching equipment and send messages to subscribers, characterized in that processing of calls from subscribers in this case is carried out sequentially in two stages, at the first stage, the conversation time is limited to a predetermined value T, of which the subscriber is notified through an autoinformer if this operation does not lead to the desired result, that is, there is no decrease in the load Y(t) to a predetermined threshold Y1, then the value of T is halved, if after that Y(t) > Y1, then go to the second stage, at which a pause of duration τ is introduced for each subscriber who has completed the conversation until the next attempt to establish a connection is possible, and the subscriber is also notified about this through the autoinformer, if this operation does not lead to the desired result, that is, the load Y(t) does not decrease to a predetermined threshold Y1, then the value of τ doubles. 2. The method according to claim 1, characterized in that T is equal to 1 minute. 3. The method according to claim 2, characterized in that τ is equal to 10 seconds.

Images