RU2737959C2 - Subscriber notification management system - Google Patents

Abstract

FIELD: telecommunications and communication.

SUBSTANCE: invention relates to telecommunications and communication, specifically to management of notices of subscribers of cellular communication networks of any standards, incl. GSM, UMTS (IN Intelligent Network), LTE (IMS IP Multimedia Subsystem), on possibility of establishing a connection. Indicator of the operator's economic efficiency is increased due to taking into account the maximum possible number of network features of the calling and called subscribers when determining the direction of the ISA transfer. Control system is easily scaled to any number of subscriber network features and adapted to any ISA scenarios.

EFFECT: determining the direction of transmitting a notification message to the calling or called subscriber about possible establishment of repeated call initiation based on analysis of network charging, geodata, other behavioural characteristics of the calling and called subscribers in the network, which leads to higher economic indices of the mobile network operator (NP network provider) by stimulating the performance of voice calls.

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Description

The proposed invention relates to the field of telecommunications and communications, in particular to systems used in cellular networks of any standards, incl. GSM, UMTS (IN Intelligent Network), LTE (IMS IP Multimedia Subsystem), and is intended to improve the economic performance of a cellular operator (NP network provider) by stimulating voice calls to its network by informing subscribers about the occurrence of network events related mostly with attempts to make voice calls.

It is known that in addition to basic connectivity services, cellular operators provide various value-added services designed to improve its cost-effectiveness. Such services are aimed at attracting and retaining subscribers and are implemented by integrating additional PAK software and hardware complexes into the operator's core network. In the current state of the art, such services are called VAS (Value Added Services) because aimed at generating additional income for the operator. One of the most effective means of increasing the economic efficiency of NP A is to stimulate making voice calls from subscribers registered in other NP B - offNet subscribers B, home homeNet subscribers A who are registered in its NP A. The main means of stimulating offNet subscribers B to make calls to homeNet And the network at the current level of technology is to notify offNet (as well as homeNet) subscribers about unsuccessful calls by sending a missed call signal - MCA (Missed Call Alert) to the network or by sending an SMS with information about the called subscriber and his readiness to accept an incoming call (SMS MCA ). Such services are called MCA, their implementation is associated with the integration into the core NP A network of additional PAKs interacting with switching and billing nodes. The technical appearance of MCA services is based on identifying network events associated with the impossibility of establishing a call, determining the scenario of a failed call, sending an IAM message to the calling or called offNet subscriber ISUP and the subsequent immediate transmission of a RELEASE message to the ISUP network after the subscriber's offNet switching node confirms its readiness call. Thus, NP homeNet of subscriber A achieves the appearance in the graphical interface of the mobile device (MS / UE) offNet of subscriber B of the MCA message about the missed call. This message appears in the missed calls section and is marked with a marker on the calls icon on the MS / UE home screen. Another means of notifying the MCA services is to send an offNet SMS message to subscriber B with a notification that subscriber A is back in the network or with a notification about subscriber A's homeNet acquaintance with subscriber B left offNet with a voice mail message - SMS MCA. Moreover, each MCA script uniquely determines the direction of transmission of the MCA signal - to the called or calling subscriber. And the ultimate goal of choosing the direction of transmission of MCA is always to stimulate an incoming call precisely to the network of the NP A operator - the homeNet operator of subscriber A.

The MCA services consider unsuccessful calls in the following main scenarios:

- transfer of MCA to subscriber B called offNet when subscriber A's homeNet attempt with prepaid billing to make a call in conditions of insufficient credit account - homeNet A charge = 0;

- transmission of MCA to subscriber B called offNet after unsuccessful call to its homeNet subscriber A due to the busyness of subscriber B called offNet or his absence in the network - offNet B busy, absent;

- transfer of MCA to subscriber B calling offNet after unsuccessful call to subscriber A homeNet due to busyness of subscriber A called homeNet or his absence in the network - homeNet A busy, absent;

- transfer of MCA to the called offNet subscriber in case of forced rejection of the outgoing homeNet call by subscriber A or loss (cancellation) of this call due to network errors before establishing the signaling connection (call connection) homeNet A abandon, netErr;

- SMS offNet transmission to subscriber after unsuccessful attempt to send homeNet SMS by subscriber A in conditions of insufficient homeNet credit account of subscriber A or network errors - homeNet A SMS delivErr;

- SMS transmission of an offNet notification to subscriber B by SMS MCA about familiarization or non-familiarization of subscriber A's homeNet with subscriber B left offNet with a message by the head of mail - homeNet A VMalert;

The technical appearance of the MCA services in these scenarios is described in Eurasian patents 025088, 024150, RF patent 2553452, WO 2015008232 application, EAPO application 201690222, RF patent 2677851, RF applications 2019125337, 2019119465 and previous patent documents. The methods of providing MCA services in the signaling network known from these documents are based on the reception and analysis of signaling messages - signal units (SU-signal unit) after their routing to the VAS network node or by passive capture of SU in the NP core network (Core Network (CN)) (Clause 3.2. 3 GPP TS 23.002 Technical Specification). The method according to the patent EAPO 025088 is based on ISUP routing a call to an additional network node and disconnecting the call upon its command. The method according to the patent 2553452 is based on the direction of the outgoing call of the so-called. means for generating a notification (answering machine) to the calling prepaid subscriber and informing the so-called network node USDS (Universal System for the provision of Additional Services) which then generates the ISA message to the called. In this case, both sending to the answering machine and informing the USDS is performed according to the logic of the PPS billing unit for prepaid subscribers. The methods for RF patents 2677851, EAPO 024150 and RF applications 2019119465, 2019125337, EAPO 201690222 generally passively analyze the signal exchange SU CAP (Camel application part ETSI TS 123 078 technical specification) messages between the MSC switching node and SCP billing.

The system and method according to the application WO 2015008232 describes schemes for including an intelligent IN platform into the network, which performs the functions of notifying the end party about an unsuccessful attempt to obtain a service by the initiating party. The presented topologies of the IN platform integration are limited to three main options - call routing from SSP to IN platform (Fig. 3); passive analysis of the signaling link SSP - SCP (Fig. 4); receiving a stream of events from the billing SCP platform (Fig. 5).

A device implementing these methods is described in the EAPO application 201501096, the PAC passively analyzes the messages of the CAP, RADIUS, DIAMETER protocols at the signaling section MSC switch - billing prepaid subscribers PPS (Prepaid Pay System) also known as Online Charging System (OCS). The analysis is associated with various network events - a change in the subscriber's location, registration in the network, an attempt to make a call from blocking, a balance request, reset or interruption of a call and SMS message, appearance in roaming, inability to connect with the called subscriber, appearance of an SMS-MT message in the network, change IMEI and many others. The list is subject to change in accordance with the prior art and business preferences of the operator. The software logic of the UAC, which implements a certain VAS service, analyzes messages (network events), generates and transmits messages to the NP network that determine the response to them. Such a reaction may consist in the formation and transmission of MCA messages, when a call cancellation or network errors are detected, SMS transmission when an SMS delivery failure is detected, and others. Another application for capturing network events can be the accumulation of a subscriber profile on a VAS node in order to promote personalized services.

In general, the above solutions of MCA services are united by one idea - routing SU messages to the server and turning it off, or passive analysis of network events at the site of switching node - billing node with subsequent initiation of ISUP MCA.

Technically, in the context of the ubiquitous use of the architecture of IN networks with their paradigm of separation of call switching functions and provision of additional services, passive analysis of network events, disconnection (RELEASE) of a call on a billing command and subsequent independent transmission of MCA is preferable to active call routing to an additional server and disconnection (RELEASE ) call at his command.

In the IMS network, operators are gradually switching to the architecture, the choice of the appearance of the MCA is not so unambiguous. First, the IMS network does not support the ISUP protocol, which means that in order to execute the MCA, it is necessary to pack ISUP messages into SIP protocol messages - SIP-I and then extract them at the MGC (Media Gateway Controller) node. Second, the IMS paradigm of the SIP AS application servers dictates the routing and modification of the SIP session on the AS server.

Economically, in the context of the growing variability of tariffication of subscribers (tariff plans), all these solutions are united by one drawback - the unambiguous target direction of the MCA to the subscriber whose call should be provoked into the subscriber's NP A homeNet network. If in scenarios homeNet A charge = 0, A abandon, netErr, the choice of the direction of transmission of the MCA is economically obvious. Then in offNet scenarios B busy, absent and homeNet A busy, absent, this choice requires a separate analysis, which the known analogues do not carry out. The disadvantage is a consequence of the lack of analysis and processing of mutual influence and optimization of network features of subscribers A and B. In all solutions, such analysis is limited to identifying identifiers (MSISDN) A and B of subscribers, identifying the scenario of a failed call - the reasons for ISUP, SIP Cause Code, tracking the presence of subscribers in the network and in some cases, subscriber profiling.

Thus, an event of a failed call may appear in the network in the offNet B busy, absent scenario, in which homeNet subscriber A is served at a tariff with advance charging. The standard scenario in this case provides for the generation of MCA towards offNet of subscriber B in order to stimulate his outgoing call to homeNet to subscriber A. Mutual settlements of operators NP A and B for servicing this call, if it is made, provide for the transfer by operator NP B in favor of operator NP A 0 , 5 rub. At the same time, the advance tariffication of subscriber A's homeNet, in case of making an offNet call to subscriber B, provides the operator NP A with a revenue of 2 rubles. in 1 min. As can be seen in this case, the operator NP A by transferring the MCA in the standard scenario provokes a shortfall in revenue.

The developed system of package tariffs dictates the operator to take into account the balance of prepaid homeNet minutes of subscriber A. Operator NP A needs to economically evaluate the benefits of receiving revenue for servicing an incoming call from the offNet subscriber of operator NP B, or to the purchase of a spent homeNet package by subscriber A and the cost of a minute in the purchased package. or enabling postpaid tariffication of subscriber A's homeNet for an outgoing call towards NP B (offNet of subscriber B). At the same time, the operator must take into account the remainder of minutes in the current package and the statistics of the duration of calls to homeNet of subscriber A. And only after an economic assessment of these factors, operator NP A can make a decision on a reasonable choice of the direction of transmission of MCA - towards homeNet A or offNet B of the subscriber.

The decision to choose the direction of the MCA complicates the various network characteristics of subscribers A and B - geolocation, IMS subscription, network presence, etc. For example, it is known that the cost of connecting a call in an IMS network is different from connecting to an IN network. It is also known that in roaming, an outgoing call is more expensive than an incoming call. This means, for example, if the homeNet subscriber A (or B) is in roaming, i.e. temporarily serviced by a third-party operator NP С, operator NP А must estimate the cost of possible outgoing and incoming calls. And such an estimate should include the cost of servicing these calls in NPn transit networks through which the possible call will be routed.

Moreover, both the calling homeNet A and the called homeNet B subscribers can be of the same NP A operator, have different tariffication and balances on it. As one skilled in the art understands, various MCA scenarios are dictated by a variety of features of subscribers A and B, including and not limited to those described above. In this case, the elements of the set of network features of each subscriber are superimposed on each other and have mutual influence, for example, if both subscribers A and B are in roaming and are served by different guest operators NP C1 and C2. Under these conditions, making a decision on the choice of the target side of the ISA (A or B), the stimulation of which is economically preferable for the operator NP, is a difficult task.

The proposed invention is aimed at solving this problem. The solution is achieved by programmatically maximizing the economic indicator of operator NP A in the space of network features of subscribers A and B when solving the problem of choosing the direction of transmission of MCA in the conditions of notifying subscribers A and B about the failed call. The known analogs do not solve such a problem, confining themselves to the obvious stimulation of an offNet call by subscriber B to subscriber A's NP A homeNet network.

As a prototype, the authors chose the closest way of aggregating the operator's additional income at the request of EAPO 201690222 according to which the mobile operator detects that the call was not established due to the unavailability of the second (offNet) subscriber B and issues a transit call to the second (offNet) subscriber B associated with the identification of the first (homeNet) of subscriber A.

The disadvantage of this method, as mentioned above, is the lack of analysis of network charging features, geodata, and other behavioral features in the network of subscribers A and B to maximize the economic indicator of operator NP A when performing ISA. The method proposed by the authors stimulates the operator's additional income, but does not maximize it, and in the worst case, as shown above, implies a shortage of additional income

The technical task and technical result of the subscriber notification management system proposed by the authors is to maximize the indicator of the economic efficiency of a cellular operator when notifying subscribers about failed calls.

The technical result is achieved by means of a subscriber notification management system, according to which the mobile operator discovers that the establishment of an initiated call is not possible for the following reasons: attempts of a prepaid subscriber to make a call in conditions of insufficient credit account, unsuccessful subscriber call due to busyness or absence in the network, forced reset of an outgoing call by the subscriber or the loss of this call due to network errors before establishing a signaling connection, an unsuccessful attempt to send an SMS in conditions of insufficient credit or network errors, as well as notifying the subscriber about familiarization or not familiarization with the message left by the head of mail. The system determines the caller, the called subscribers and the reason for not establishing the initiated call, detects the fulfillment of the conditions in the network that facilitate the establishment of a connection when the call is re-initiated, implements the algorithm for generating a notification message about the possible establishment of a re-initiation of a call, generates and transmits to the network using the ISUP, SIP connection establishment protocols , SMPP protocol has at least one notification message about the possible establishment of a re-initiation of a call, and the algorithm for generating a notification message about the possible establishment of a re-initiation of a call includes solving the problem of maximizing the economic efficiency of a cellular operator to determine the direction of transmission of a notification message to the calling or called subscriber about a possible establishment re-initiation of a call, taking into account the network characteristics of the calling and called subscribers.

The proposed system is illustrated by drawings:

FIG. 1 shows the standard options for the inclusion of the XDRay PAK in the simplified network architecture of the NP A.

FIG. 2 shows a generalized network dialog for implementing a method for managing subscriber notifications.

The figures do not limit the network architecture, call sequence or entity interaction scheme within the scope of the present invention, but illustrate preferred options providing the claimed technical result. In the figures, the signal network - Circuit Switched (CS) Domain is shown with dashed lines, packet network - Packet Switched (PS) Domain solid lines (3 GPP TS 23.002 Technical Specification). In the context of the application, in the description and in the figures it is determined that the identifiers of the caller and the called subscriber ID are their unique standardized data used to process connections on NP network nodes (SSP, SCP, HLR, VLR, BSS, etc.) and associated with the provision of services and charging (MSISDN, IMEI, IMSI, IP address, etc.). IDs of home homeNet subscribers A of NP A are marked with the letter An - MSISDN A1, A2, etc., IDs of subscriber offNet In another network NP B is marked with the letter Bn - MSISDN B1, B2, etc. In special cases and individual scenarios, it is assumed that ID B also includes subscriber numbers of the public switched telephone network (PSTN) (Public Switched Telephone Network). Call connection - establishment of a signaling SS7 connection for making a conversation between AB subscribers (Call).

As a specialist understands, the task of maximizing the criterion of economic efficiency in the space of subscribers' network events is solved regardless of the network architecture standard, the Point of Presence (POP) of network nodes and private implementations of the network topology. Therefore, without limiting the scope of legal protection, the proposed method can be performed both in IN UMTS networks and in IMS LTE networks, as well as in the next generation networks of ITU-T, 3GPP and ETSI standards.

FIG. 1 illustrates a simplified standard architecture of a cellular operator NP A and standard private options for integrating the XDRay PAK into the network architecture using the IN network as an example. This illustration for demonstrating the method was chosen due to the still more prevalence of IN networks compared to the IMS architecture, as well as due to the greater proportion of subscribers with advance charging. In IMS LTE networks (not shown in Fig. 1), the proposed method is performed due to the interaction of the XDRay PAC with the P / I / S-CSCF (Proxy / Interrogating / Serving Call Session Control Function) logic element and the charging control network node and provision of OCS / PCRF (Policy Control and Charging Rules) services.

In the case shown in FIG. 1 of the private implementation options (1, 2, 3) of the XDRay PAK integration are concentrated around the signaling link: SSP switching node - SCP billing node. The functions of the SSP switching center are performed by the VMSC mobile switching center, in the coverage area of which subscriber A's homeNet is located. The functions of the billing node SCP are performed by the prepaid subscriber charging platform PPS (Prepaid Pay System).

In the 1st integration option, the unsettled ISUP call is routed to the XDRay PAK upon the activation of the CSI trigger on the VMSC. And the subsequent disconnection of the call and the execution of MCA by the program logic of the PAC XDRay according to the MSISDN, Cause Code ISUP messages. Option 2 provides for passive analysis of the authentication, authorization and accounting protocols CAP, DIAMETR and the execution of the MCA upon the appearance of a message on the unsuccessful ISUP call establishment on the signaling section. Option 3 provides for receiving a stream of events from the PPS platform and identifying from it the events of an unsuccessful ISUP call establishment. In the 2nd and 3rd versions of ISUP, the call is disconnected to the VMSC by the PPS command, and the MCA is executed by the PAC XDRay program logic according to the data (MSISDN, Cause Code) of the processed events of the CAP and DIAMETR protocols.

Within the framework of the proposed method for its implementation, but without limiting the scope of its legal protection by the software and hardware part of the node, the XDRay PAK developed by the authors is presented - a complex for notifying about events of subscriber behavior in cellular networks, developed by the authors - application WO No. 2013107454. The hardware part of the complex is implemented on servers of X86 architecture running a Unix-like operating system.

The XDRay software architecture is the applicant's know-how and is implemented with the ability to receive, passively analyze, process CAP, DIAMETR protocol messages and save the history of the call service process. The software logic of the XDRay PAK is optimized for an instant response to the events of the operator's signaling network in the linkage "capture-storage-notification" and the PAK provides such a linkage in different combinations. Software modules for solving mathematical optimization problems of the XDRay HSS include algorithms for solving problems of maximizing the criterion of economic efficiency, including optimization problems in a finite-dimensional space, including random search algorithms for multidimensional optimization problems.

To perform the MCA, the PAC XDRay is configured to receive, process and initiate any SS7 signaling connections (SIP, ISUP). XDRay PAC is also an element of the external short message system ESME (External Short Message Entity) in terms of the SMPP protocol. In IMS networks, to perform MCA, the IVR network node is endowed with the P-CSCF (Proxy - Call / Session Function) serving session control function. The XDRay software functionality includes the ability to profile homeNet subscribers by the type of network events they generate.

FIG. 2 demonstrates a generalized network dialogue for implementing the method using the example of 2 variants of integrating the XDRay PAK in the NP A network architecture in offNet B busy, absent and homeNet A busy, absent scenarios using the ISUP IN network protocol and the SIP IMS network protocol as an example. The second option for integrating the XDRay PAK (Fig. 1 passive analysis of SSP-SCP) is chosen as the preferred one in the paradigm of separating the call handling functions and the provision of IN networks services. As a specialist understands, without limiting legal protection, the algorithm for solving the problem of maximizing the criterion of economic efficiency is applicable in other versions of the XDRay HSS integration, MCA scenarios and connection establishment protocols.

In the offNet busy scenario, absent subscriber A dials the offNet call of subscriber B to MS / UE A 1 Dial (Calling A, Called B); SIP INVITE (Calling A, Called B). The standard dialogue SSP-SCP identification and billing 2 CAP, DIAMETR IDP (Calling A, Called B) is performed; CCR (Calling A), 3 Apply Charging. Then 4 ISUP IAM (Calling A, Called B) are formed on SSP; SIP INVITE (Calling A, Called B) to the address of signaling point NP B of subscriber B serving offNet. After ISUP processing, SIP connection establishment requests, the offNet signaling point of subscriber B responds with codes 5 ISUP CC = 17.18; SIP 480, 486 corresponding to busy or not answering offNet of subscriber B. In the IN network, SSP generates call processing states DP5, DP6 and broadcasts these events to SCP 6 ONoAnswer, OCalledPartyBusy, and upon his answer 7 RELEASE disconnects the call.

Upon the appearance of 6 ONoAnswer, OCalledPartyBusy messages on the network, the XDRay software algorithm determines the unsuccessful call setup in the offNet B busy, absent scenario and starts the PROFIT MAXIMIZER STARTUP cost efficiency maximization algorithm. The solution to this problem in the space of network features A and B of subscribers determines the preferred direction towards the homeNet of subscriber A. Then XDRay transfers 8 SMS MCA to MS / UE A. Since the call was initiated by him, SMS MCA is formed, otherwise MCA is generated ...

In the scenario homeNet A busy, absent, the SSP that serves the homeNet of subscriber A receives a request to establish a voice call 9 ISUP IAM (Calling B, Called A), SIP INVITE (Calling B, Called A). After processing the requests, the SSP sets the call processing status DP5, DP 6 meaning that homeNet subscriber A is busy unavailable and sends the appropriate responses 10 ISUP CC = 17.18; SIP 480, 486 to NP B address. Further, according to standard logic, the call is disconnected and the 11 RELEASE signaling channels are released.

When the T Busy, T No Answer messages appear in the network, the call processing status DP5, DP 6, the XDRay software algorithm determines the unsuccessful call setup in the homeNet A busy, absent scenario and starts the PROFIT MAXIMIZER STARTUP cost efficiency maximization algorithm. The solution of this problem in the space of network features A and B of subscribers determines the preferred direction towards the homeNet of subscriber A. Determination of the availability state of both subscribers is not difficult and is performed traditionally by directing hidden SMS to the MS / UE of interest, or by other methods known from the prior art. Then XDRay transmits 12 MCAs to MS / UE A.

A simplified model of the PROFIT MAXIMIZER STARTUP algorithm - includes taking into account the network features of subscribers A and B and can be built on the basis of the vector A (a ₁ , a ₂ , ... a _n ) of the network features of the homeNet subscriber A, and the vector B (b1, b2, ... b _n ) network features of offNet (or homeNet) of subscriber B. By definition, the set of features of vectors A, B is limited by the economic characteristics of the provision of services laid down by the operator in the problem of maximizing the criterion of economic efficiency.

For example, according to the current network characteristics of subscriber A's homeNet, it is known:

• price of an outgoing call in the S package 200 rubles. in 100 minutes → a 1 = 2 * t rub .;

• the price of an outgoing call after spending the package is 3 rubles. for 1 min → a 2 = 3 * t rubles;

• the cost of servicing an incoming call in the operator's network NP В 0.5 rubles. in 1 min. → a 3 = -0.5 * t rub;

• the remainder of the package L = 10 minutes;

• average call duration t = 2.5 minutes;

• the probability of making a call after receiving the MCA → the ratio of the number of N calls to the number of M MCA → P _{MCA a} = N / M = 0.75;

Illustratively, for the sake of simplicity, it is determined that homeNet subscriber A is not in roaming, is registered and served in his network NP A. Therefore, the sign of call service in roaming → 0.7 rubles. in 1 min. → a 3 = -0.7 * t is not included in the system.

Thus, the event of making a call to homeNet of subscriber A after receiving the MCA can be represented as a simple system of linear equations:

Knowing the average talk time t = 2.5 minutes. and the remainder L = 10 min. for the package, the calculation of the probabilistic tariffication coefficients of this call in the package a1 <S and outside the package a2> S is performed:

With the current balance L = 10 min. homeNet subscriber A will usually make K = L / t = 4 calls with an average duration of t = 2.5 minutes, i.e. with probability P _S = 4 / K = 1. Then, with the same remainder, he will make one call with a duration equal to the remainder of the packet with the probability P _sLim = 1 / K = 0.25. NP A reliably P _I = 1 will pay the operator NP B 0.5 rubles. for min. for servicing the call a3. Taking into account the probability coefficient of making a call P _{MCA a} = 0.75 according to the rule of joint events, the probability coefficients of call tariffication:

in the package R _{a 1} = P _S * P _{MCA a} = 0.75;

outside the package R _{a 2} = P _Slim * P _{MCA a} = 0.187;

service R _{a 3} = P _I * P _{MSA a} = 0.75;

As is clear from the conditions of the problem, the vector B (b1, b2, ... bn) of the network features of the homeNet subscriber B (the same operator NP A) can be constructed by analogy, by the condition that the network features of all homeNet subscribers are known. For simplicity, it is assumed that subscriber B is an offNet subscriber of another operator, is served in his NP B network and is not in roaming. Then the construction of the vector B (b1, b2, ... bn) is limited to the known offNet features of the subscriber B contained in the CAP, DIAMTER message processed by XDRay and the known statistical coefficients:

• service price of an incoming call from the operator's network NP В → b1 = 0.5 * t rubles;

• average probability of making a call after receiving MCA → the ratio of the number of N calls to the number of M MCA → P _MCAb = N / M = 0.8;

The event of making a homeNet call to subscriber A after receiving the MCA can be represented as an equation:

B = b1 = 0.5 * t;

To characterize the random variables of receiving income from a possible call by subscribers A and B after receiving the MCA in this simplified model, it is sufficient to calculate the metamathematical expectations:

M (A) = a1 * R _{a 1} + a 2 * R _{a 2} + a 3 * R _{a 3} = 5 * 0.75 + 7.5 * 0.187-0.125 * 0.75 = 5.06

M (B) = b1 * P _b1 = 0.5 * 5.06 = 2.53

Obviously, comparing the expectation values M (A)> M (B), the XDRay program logic will transfer the MCA to the MS / UE A address, since it is this direction that assumes the maximization of profit for operator NP A. Moreover, under these conditions, this direction is advisable in both offNet scenarios B busy, absent and homeNet A busy, absent. From the mathematical model it is clear that the problem does not take into account the party that initiated the unsuccessful call, but solves the problem of choosing a direction to maximize the operator's profit. In this case, the party that did not initiate the unsuccessful call, for obvious reasons, is sent the SMS MCA to the party that initiated the unsuccessful call of the MCA. The known MCA methods are limited to the transfer of MCA to the offNet caller B to the MS / UE B address, which, as can be seen, implies a loss of profit for the NP A.

The shown example of the model is maximally simplified and does not contain signs of subscribers being in roaming and / or additional signs of economic interest for the operator. It is clear that without losing the generality of reasoning, the model can be supplemented with such features. Moreover, the solution to the problem of finding the maximum economic efficiency within the proposed control system can be solved by any other mathematical methods known from the prior art. For example, when searching for unknown variable parameters of the values of vectors A (a1, a2,… an), B (b1, b2,… bn), the problem of finding the maximum can be solved by classical optimization problems, including the well-known methods of enumeration and random search.

The technical effect of the proposed system is to take into account all quantitative and probabilistic characteristics of subscribers, known and calculated from the data of network messages processed by the XDRay PAK. The control system is easily scalable to any number of subscriber network attributes and adapts to any ISA scenarios. The tests carried out by the applicant in the architecture of a well-known operator have confirmed the economic efficiency of the proposed system.

Claims (3)

1. A method for managing subscriber notifications, implemented by the subscriber notification management system, according to which the cellular operator detects that the establishment of an initiated call is not possible, determines the caller, the called subscribers and the reason for the non-establishment of the initiated call, detects the fulfillment of conditions in the network that facilitate the establishment of a connection, upon re-initiation call, implements the algorithm for generating a notification message about the possible establishment of call re-initiation, generates and transmits to the network at least one notification message about the possible establishment of call re-initiation, characterized in that the algorithm for generating a notification message about the possible establishment of call re-initiation includes solving the problem of maximizing the indicator the economic efficiency of the cellular operator to determine the direction of transmission of the notification message to the calling or called subscriber about a possible setting Call re-initiation, taking into account the network characteristics of the calling and called subscribers. 2. The method according to claim 1, characterized in that the impossibility of establishing the initiated call is due to and is not limited to the attempt of a prepaid subscriber to make a call in conditions of insufficient credit account, an unsuccessful call to the subscriber due to busyness or absence from the network, forced reset of the outgoing a call by the subscriber or the loss of this call due to network errors prior to establishing a signaling connection, an unsuccessful attempt to send an SMS in conditions of insufficient credit or network errors, as well as notifying the subscriber about familiarization or not familiarization with the voice mail message left by him. 3. The method according to claim 1, characterized in that the notification message about the possible establishment of re-initiation of a call is an MCA message generated using the ISUP, SIP connection establishment protocols, an SMS, USSD message generated using the SMPP protocol.

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