RU2619082C1 - Method for user connection in case of callback, and device for its implementation - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: method is performed by signal processing for a decision of connection of users in the additional node 6 of service control, connected to the node 3 of service control and the switches 2 and 5, and connection of users 1 and 4 at their callback is made in the network node 7 connected with the switches 2 and 5 off the switches 2 and 5.

EFFECT: increased speed of connection establishing in case of callback, improved communication quality for users.

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Description

The invention relates to the field of telephone communications and for its improvement to meet the needs of subscribers in their oncoming calls.

The closest analogue of the invention is the development of the Swedish company Erickson - patent WO 2013/116971 from 2013. This invention describes a technical solution for communication networks of various nature and organization in which a network node that performs call analysis and switching (MSC or Server) is equipped with an additional function that implements a method for analyzing the presence of a counter connection on a given network node for the same pair of subscribers. According to the invention, messages (signals) of call establishment, such as IAM and INVITE, are used for analysis (options are used in different types and generations of communication networks); if a counter pair is detected, one of the call attempts is suppressed by the network node, freeing up a resource for switching the second one.

The analogue has significant disadvantages:

the need to implement on numerous network nodes, the modification of the operation algorithms of which represents in practice a technically and economically difficult task;

defining one of the parties as the caller and rejecting one of the calls leaves the probability of simultaneous operation of the proposed method on several switches (servers) involved in the process of organizing calls and the probability of rejecting both calls;

defining one of the parties as the calling one and rejecting one of the calls, together with the presence of time periods necessary for the network nodes to establish a call switching, characteristic time periods for the subscriber device to operate, time periods for the subscriber’s response, creates a high probability of the inability to connect using the proposed method.

The technical result of the proposed invention is to increase the speed of establishing a connection in mutual calls, improve the quality of communication for end users (subscribers), significantly increase the level of availability of the method for implementation on communication networks, reduce the technological load in communication networks and increase revenue for networks serving users.

The specified technical result is achieved in that in the method of connecting subscribers in the face of calls, in which to determine the presence of the customer’s call, the service control node connected to the switches is used, in the presence of the customer’s return call, the signal processing for deciding on the connection of the subscribers is carried out in the additional control node services connected to the control center of services and switches, and the connection of subscribers when they meet calls is carried out in connected to the comm Ator network node is switch.

The technical result in the device for implementing the method is achieved by the fact that the device for connecting subscribers, containing interconnected switches and a service control node, is equipped with an additional service control node and a network node connected to it for connecting subscribers when they meet calls, with an additional control node services connected to the node management services and switches, and the network node is connected to the switches.

An additional service control node can be connected to the service control node and switches through standard signaling interfaces for organizing a call to CAP, INAP, SIO to implement the procedure for determining the characteristics of a call back and forming a control effect on call routing.

An additional service control node can also be connected to the service control node and switches through standard signaling interfaces of call organization ISUP, SIP / RTP to implement the procedures for transmitting media information, detecting signs of a return call and forming a control effect on call routing.

The invention is illustrated by drawings.

In FIG. 1 is a diagram illustrating a typical organization of the interaction of devices (network nodes) in a modern communication network.

In FIG. 2 is a diagram illustrating the organization of interaction in a communication network with the introduction of new devices (network nodes).

In FIG. 3 is a signaling diagram illustrating the steps of an applied method in a communication network.

In FIG. 4 is a diagram illustrating the composition and interaction of devices (network nodes) for implementing the method on a network with a large number of served users and calls.

The specific implementation of the invention described below is not limited to the specific component parts of the devices described herein, or to the steps used in the method, as they may vary. The terminology used is used only to describe the constituent elements without the purpose of any restrictions.

Common to all types of communication networks are two levels:

- signal level - a set of messages and signals that is used by participants in a communication network (end-user devices and network nodes) to perform registration operations, make a call, confirm readiness, and possibly about the features of supported communication types (voice, video, encoding method) , signals of confirmation of the beginning or end of the conversation, signals of the reorganization of the channel, signals informing the parties (nodes) involved in the organization of communication, information about the quality and charging; in digital networks it is also used to transmit information about services allowed to the user and other information necessary for the operation of the communication network;

- media level - the level of organization of the exchange of voice or video information encoded in digital format, may allow intermediate transcoding of signals at intermediate nodes, when switching from network to network or while providing additional services.

The indicated logical separation into the signal and media levels is true both for the most modern types of OTT communication networks (Over-the-Tor, over the IP access network - Internet), such as Skype, Viber, GoogleTalk, Facebook Messenger, WhatApp, and for the classic types communications described in telecommunication standards ITU-T, ETSI, 3GPP and other institutions.

To enable global communication and roaming in mobile cellular networks, an expanded amount of signaling information is used to transmit data of subscribers, short text messages (SMS and USSD) and call information in combination with the classical signaling of call control. Thus, in a modern digital telephone network, two levels of signaling coexist - signaling to ensure the operation of cellular services and signaling associated with calls, allowing you to send and receive calls to and from an external communication network.

In FIG. 1 shows a typical diagram of a modern communications network for digital telephony, using the capabilities of intelligent control of the connection process. As part of the smart management, the user nodes (subscribers, subscriber) serving network nodes designated as VMSC (the abbreviation used to refer to the telephone exchange in the cellular network - VisitorMobileSwitchingCenter, often also called switches), interact with the intelligent management node, here and standardly designated as SCP (SignalingControlPoint), for requests for the provision of services after the initiation of the request by the user. A request from a VMSC to SCP can be generated, in particular, when a request is made from a user device for a communication session, if there are special settings for the VMSC network node and user profile settings stored in the VMSC while the user is in the coverage area of this VMSC network node. The SCP response may contain a response confirming the possibility of the requested communication session without conditions, may contain a response obliging the VMSC network node to make a second request after a certain time, or may contain instructions on the permanent or temporary change of the call organization route, direction to the voice platform for playing audio information (for example, about insufficient balance to make a call) or the provision of an additional service (for example, recording a voice message is not available user name - voicemail).

The solid arrows in FIG. 1, the procedure for establishing a call from a user (subscriber) to a network node (telephone exchange) and between network nodes is indicated. The dotted line indicates the signal exchange. As shown in FIG. 1, in the case of simultaneous calls by each other's subscribers, in general, both users will be busy and the communication session will not be successfully established. Subscriber 1 initiates a Call ₁ -1 call through switch 2 (VMSC ₁ ), which requests the Service Control Unit (SCP) 3 to allow the call to continue establishing and continues to establish Call ₁ -2 connection towards called party 4 to switch 5 (VMSC ₂ ), where the called party 4 is busy. Similarly, user 4 initiates a Call ₂ -1 call through switch 5 (VMSC ₂ ), which makes a request to node 3 (SCP) to allow the call to continue establishing and continues to establish a Call ₂ -2 connection in the direction the called party 2 and the switch (VMSC ₁₎ for the call, wherein the switch 2 reports the employment of the recipient 1.

In FIG. Figure 2 shows a diagram of a communication network with the introduction of new devices (network nodes) that correct the situation of simultaneous requests (calls) to establish communication in the opposite direction, providing call routing correction, performing connection setup procedures for both callers, and combining the back-up media streams directing the outgoing media stream of one call to the incoming stream of the second call and directing the outgoing stream of the second call to the incoming stream of the first ova. With the introduction of new network nodes - an additional service management node 6 and a network node 7 connected to it to connect subscribers 1 and 4 during their incoming calls - using standard interfaces previously available from the point of view of network interaction, it becomes possible to change the order of signal exchange by changing equipment settings and / or user data changes describing the addresses of the intelligent control network nodes (SCPs) involved in the provision of services.

The solid arrows in FIG. 2, the procedure for establishing a call from a user (subscriber) to a network node (telephone exchange) and between network nodes is indicated. The dotted line indicates the signal exchange of standard interfaces and interaction interfaces of nodes 6 and 7. In contrast to the standard service scenario described above in FIG. Figure 2 shows the sequence when, after the request of subscriber 1 to initiate a call Call ₁ -1 through switch 2 (VMSC ₁ ), a request is made to node 3 (SCP), which, in turn, requests node 6 (SCP _QNECT ) to analyze for the presence of a counter the call, receives a response either about continuing the routing of the call to 5 (VMSC ₂ ) without changes (formation of Call ₁ -2), or about the need to change the route of the call towards the network node 7 (iMCF _QNECT ) and form the call of the corresponding Call ₂ -3, and broadcasts the response to node 2 (VMSC ₁ ).

An implementation scheme is practically possible in which a request from node 2 (VMSC ₁ ) occurs immediately to node 6 (SCP _QNECT ), which in turn requests or does not request node 3 (SCP). Another scenario is the configuration of network nodes and user profiles, in which the request for nodes 3 and / or 6 occurs upon the arrival of a call to node 5 (VMSC ₂ ) serving the called subscriber - in this case, the call passes sequentially from subscriber 1 to switch 2 (VMSC ₁ ), to switch 5 (VMSC ₂ ) and in the case of signs of a call back to node 7 (iMCF _QNECT ). Nodes 6 (SCP _QNECT ) and 7 (iMCF _QNECT ) are connected by a software interface that provides the ability to analyze the presence of attempts to make counter calls - active user sessions and user requests.

The order of processing the call from the subscriber 4 in FIG. 2 is completely analogous to the order and variations of call processing by subscriber 1.

The switch 7 (iMCF _QNECT), receiving control calls Call ₁ and Call ₂ -3 -3 analyzing signaling information associated with the call and information received from node 6 (SCP _QNECT), determines whether to generate signals confirming the beginning of the conversation, and providing the media traffic exchange process between calls call ₁ and call ₂ -3 -3. Network nodes 6 (SCP _QNECT ) and 7 (iMCF _QNECT ) can be located in the communication network of one operator or in the communication network of the partner operator, providing the necessary technical result.

The circuit of FIG. 3 illustrates examples of a signaling sequence in a communication network, detailing the method for organizing call-back combining described above, further indicating the possibility of implementing a call-combining method by gaining control of a call on node 7 (iMCF _QNECT ) through a call forwarding mechanism or through processing busy signal T_Busy on network nodes 3 (SCP) or 6 (SCP _QNECT ). The forwarding mechanism can be implemented without intelligent control nodes and / or without involving nodes 3 (SCP) or 6 (SCP _QNECT ) through the settings for controlled (CCCF) or uncontrolled (OCCF) end users forwarding. For ease of display, Node 3 (SCP) in FIG. 3 omitted.

Network nodes 6 (SCP _QNECT ) and 7 (iMCF _QNECT ) can consist of a set of devices (nodes), which is associated with the need for reliable service of a large number of users making a large number of calls at the same or near time. A modern communication network serving millions of users can process several thousand simultaneous connection attempts, which requires a reliable processing complex with the exception or minimization of failure points to achieve the desired technical result. In FIG. 4 is a diagram illustrating the composition and interaction of devices (network nodes) for implementing the method on a network with a large number of served users and calls. Node 6 (SCP _QNECT ) in reality can be represented by an arbitrary number of nodes calculated from a particular communication network from 1 to m. Node 7 (iMCF _QNECT ) in reality can be represented by an arbitrary number of nodes calculated from a particular communication network from 1 to n. For interaction between nodes 6 (SCP _QNECT ) and 7 (iMCF _QNECT ), separate iMCF _{APP / DB} devices can be taken out, providing storage and network access to the online registry of user calls or information about installation signals that are being discussed or just served by nodes 7 (iMCF _QNECT ) Calls _{Handled by} Nodes 6 (SCP _QNECT ). Nodes 6 (SCP _QNECT ) receive standard signal sequences of messages from the communication network from switches 2 and 5 (VMSC) or from node 3 (SCP) and form response control sequences. Nodes 7 (iMCF _QNECT ) receive standard signal messages associated with media channels and media sequences (streams) from switches 2 and 5 (VMSC) and generate response sequences of signals and media data. Nodes 6 (SCP _QNECT ) and 7 (iMCF _QNECT ) communicate directly or through iMCF _{APP / DB} devices using the internal programming interface (ApplicationProgrammingInterface - API).

The logic of the implementation of the method for achieving a technical result is implemented using devices 7 (iMCF _QNECT ), performing direct call processing, and devices 6 (SCP _QNECT ), directing calls to devices 7 (iMCF _QNECT ). Devices 7 (iMCF _QNECT ) can transfer call service from one device 7 (iMCF _QNECT ) to another in cases where a pair call has arrived earlier and is being served on the corresponding node 7 (iMCF _QNECT ).

Network nodes 6 (SCP _QNECT ) and 7 (iMCF _QNECT ) include an RX receiving object for receiving messages from other network nodes and a CPU object for determining whether the first and second sides call each other.

The determining object of the CPU can be included in a microprocessor, microcontroller, ASIC (specialized integrated circuit) or FPGA (programmable logic integrated circuit) or any other suitable circuit.

The receiving RX entity may be included in the receiver or part of the receiver of an I / O device, such as an Ethernet interface controller or any other suitable controller.

In addition, network nodes 6 (SCP _QNECT ) and 7 (iMCF _QNECT ) may include a memory MEM for storing data, for example, related to the capabilities of other network nodes and / or native capabilities, and may also include a TX transmitter, for example, included in an input / output device, for example, an Ethernet interface controller or any other suitable controller, for sending corresponding messages to other network nodes and / or subscribers and / or network operations.

Although the device of the present invention has been mainly described on the basis of the operation of network nodes, for example, a basic network node according to the type of individual elements, the invention can also be implemented in a unified MSC environment or in a blade environment of blade servers providing MSC or other similar functionality, as well as represent real physical or virtual logical information processing devices.

The specific combination of elements and features described in detail above is just an example; interchangeability and replacement of the proposed options and methods for their implementation with other options are also provided by the invention. Scopes of the invention are defined in the following paragraphs and their equivalents.

Claims (4)

1. A method for connecting subscribers in a meeting call, in which to determine the presence of a meeting call, a service control node connected to the switches is used, characterized in that when there is a meeting call, the signal processing for making a decision about connecting the subscribers is carried out in an additional service management node, connected to the control center of services and switches, and the connection of subscribers when they meet calls is carried out in a network node connected to the switches outside the switch tori. 2. A device for connecting subscribers, comprising interconnected switches and a service control unit, characterized in that it is equipped with an additional service control unit and a network node connected thereto for connecting subscribers when they meet, the additional service control unit is connected to the control unit services and switches. 3. A device for connecting subscribers according to claim 2, characterized in that the additional service control node is connected to the service control center and switches through standard signal interfaces of call organization CAP, INAP, SIP to implement the procedure for determining the signs of a return call and forming a control effect on routing call. 4. A device for connecting subscribers according to claim 2, characterized in that the additional service control node is connected to the service control center and switches through standard signaling interfaces of organizing a call ISUP, SIP / RTP to implement procedures for transmitting media information, determining signs of a call back, and the formation of a control effect on call routing.

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