RU2721358C1 - Method of controlling connections in mobile communication network when called subscriber is out of network coverage area - Google Patents

Abstract

FIELD: telephone communication.

SUBSTANCE: invention relates to the field of telephone communication control, in particular to the call control protocol in the telephone network when the called subscriber is outside the coverage area of the network. According to the first embodiment, the method comprises the following steps. Caller device is provided with access to the mobile communication network. Initiated call is received from the mobile telephone of the calling subscriber to the telephone of the called subscriber. When establishing communication with the mobile telephone of the called subscriber from the telephone of the calling subscriber, the call signal is sent to the switch of the calling subscriber, and from the switchboard of the calling subscriber the call signal is sent to the switched subscriber switch. In case the mobile telephone of the called subscriber is out of communication zone, from the switch of the called subscriber the signal is redirected to the platform (MCA) through the transit switch, with which the rebound signal is sent to the mobile telephone of the calling subscriber and the call initiated by the calling subscriber is interrupted. Moment when a subscriber's network appears in the network using a platform (MCA) by sending a signal through a centre for transmitting short messages to a switch of a called subscriber of an SMS message, intended to receive a subscriber's equipment, receiving a response message from SMSC on the fact of SMS delivery along a communication network to a subscriber. Short call signal is sent from the platform (MCA) to the mobile telephone of the called subscriber and after receiving the signal, communication with the telephone of the called subscriber is interrupted. From the platform (MCA) through the centre of short messages transfer to the switch of the calling subscriber the SMS-message on accessibility of the called subscriber is sent. Switchboard of the calling subscriber delivers an SMS-message to the mobile telephone of the calling subscriber on accessibility of the called subscriber. Second embodiment differs from the first one in that after determining the moment of appearance in the network of the called subscriber and receiving a response message from SMSC on the fact of SMS message delivery through the communication network to the subscriber, information on the numbers of the calling and called subscribers is sent from the first platform (MCA) to the second service platform. From the second service platform, a short call signal is sent to the mobile telephone of the called subscriber and after receiving the signal, communication with the telephone of the called subscriber is interrupted.

EFFECT: technical result consists in improvement of reliability and convenience of telephone communication in case the called subscriber is located outside the coverage area of the network.

2 cl, 2 dwg

Description

The invention relates to the field of telephone communications, in particular to a protocol for managing calls in the telephone network when the called subscriber is outside the network coverage area.

According to recent studies, companies operating in the field of mobile telephony are faced with the fact that tens of millions of phone calls do not reach their goals every day due to the fact that the “target” mobile phone is unavailable or is in sleep mode.

In other words, despite the growing use of mobile phone systems and call forwarding services, in some special conditions more than 400 calls per second disappear, which limits the amount of outgoing traffic or, in one way or another, leads to limited or incomplete customer service.

To solve these problems, it was proposed, in particular, a telephone communication control method according to the RF patent No. 2270532 (IPC H04Q 7/38, published 02.20.2006), containing the stages in which: I - determine whether the called subscriber is unavailable due to that the mobile phone is in the disconnected mode or due to the lack of a radio signal, and if the call forwarding phone to the answering machine service or another telephone number does not work, II - if confirmed, route the telephone call from the switching unit to the telephone for storing and managing data related to to a telephone call, III — extract the telephone number of the calling subscriber from the signaling component of the routed telephone call and record this telephone number and time / date of the telephone call in the list of numbers, IV — issue a delivery message to the switching node so that this switching node can release the phonic channel of the telephone call , V - determine if the mob is again available the telephone of the called subscriber, VI - if confirmed, send an SMS message containing the telephone number and time / date of the telephone call to the service center; VII - send an SMS message indicating the telephone number and time / date of the telephone from the SMS service center to the mobile phone of the called subscriber call.

A disadvantage of the known solution is the low reliability of establishing telephone connections, the inconvenience of using the proposed solution, requiring additional actions by subscribers, as well as the delay in delivering messages about missed calls.

The technical result from the use of the proposed variants of the method can be expressed in increasing the reliability and convenience of telephone communications in the case when the called subscriber is outside the coverage area of the network.

To achieve the result, a method for managing connections in a mobile communication network when the called subscriber is outside the network coverage area is proposed, according to the first embodiment, comprising the following steps:

- provide the mobile phone of the calling subscriber (MS-A) access to the mobile communication network;

- receive the call initiated by him from the mobile phone of the calling subscriber (MS-A) to the mobile phone of the called subscriber (MS-B);

- when establishing a connection with the called party’s mobile phone (MS-B), the calling signal is sent to the calling party’s switch (MSC-A) from the calling party’s telephone (MS-A), and the call signal is sent from the calling party’s switch (MSC-A) to called party switch (MSC-B);

- if the called subscriber’s mobile phone is out of the communication zone, the signal is forwarded from the called subscriber’s switch (MSC-B) to the first MCA platform through the transit switch (TMSC), from which the end signal is sent to the calling party’s mobile phone (MS-A) and interrupted Caller initiated call

- determine the moment the called subscriber appears on the network using the first platform by sending a signal through the short message service center (SMSC) to the called subscriber’s switchboard (MSC-B) SMS messages intended for receiving the called subscriber and receiving a response message from SMSC about the fact SMS delivery via communication network to the called subscriber;

- from the first platform they send a short call signal to the mobile phone of the called party (MS-B) and after receiving the signal they interrupt the connection with the telephone of the called party (MS-B);

- from the first platform through the short message center (SMSC) to the caller’s switch (MSC-A) send an SMS message about the availability of the called subscriber (MS-B);

- the calling party switch (MSC-A) delivers an SMS message to the calling party's mobile phone (MS-A) about the availability of the called party.

To achieve the result, a method for managing connections in a mobile communication network when the called subscriber is outside the network coverage area is proposed, according to the second embodiment, comprising the following steps:

- provide the mobile phone of the calling subscriber (MS-A) access to the mobile communication network;

- receive from the mobile phone of the calling subscriber (MS-A) the call he initiated to the device of the called subscriber (MS-B);

- when establishing a connection with the called party’s telephone (MS-B), the calling signal is sent to the calling party’s switch (MSC-A) from the calling party’s telephone (MS-A), and the calling signal is sent to the switch from the calling party’s switch (MSC-A) called party (MSC-B);

- if the called subscriber’s mobile phone is out of the communication zone, the signal is forwarded from the called subscriber’s switch (MSC-B) to the first platform (MCA) through the transit switch (TMSC), from which the end signal is sent to the calling party’s mobile phone (MS-A) and interrupt the call initiated by the caller (MS-A);

- determine the moment the called subscriber appears on the network using the first platform by sending a signal through the short message service center (SMSC) to the called subscriber’s switchboard (MSC-B) SMS messages intended for receiving the called subscriber and receiving a response message from SMSC about the fact SMS delivery via communication network to the called subscriber;

- from the first platform send information on the numbers of the calling and called subscribers via the REST / SOAP protocol to the second - service platform, which serves to make a separate short call to the called subscriber;

- from the second platform they send a separate short call to the mobile phone of the called party (MS-B) and after receiving the signal, they disconnect from the telephone of the called party (MS-B);

- from the first platform through the short message center (SMSC) to the caller’s switch (MSC-A) send an SMS message about the availability of the called subscriber;

- the calling party switch (MSC-A) delivers an SMS message to the calling party's mobile phone (MS-A) about the availability of the called party.

When describing a method for managing connections in a mobile communication network, the term “short call” refers to a call to a subscriber who is interrupted by the call initiator immediately after receiving information that the initiated call has reached the called subscriber, while the called subscriber cannot answer the short call. In this case, the call initiator means the second platform (option 2) or the platform on which the Missed Call Alert service (MCA) is implemented if it sends a call, and not the second platform (option 1).

The use of two platforms in the technical implementation of the variants of the method: the first platform on which the Missed Call Alert service is implemented, and the second service platform, which makes a separate short call to the called subscriber, allows for higher reliability of the system.

The claimed technical solutions are illustrated in FIG. 1 with a diagram of the implementation of the first variant of the method (example 1) and FIG. 2 with a diagram of an implementation of the second embodiment (example 2).

In these figures and hereinafter, the following positions are indicated:

Caller - A;

called party - B;

MS-A - mobile telephone number of subscriber A, pos. 1;

MS-B - mobile phone number of subscriber B, pos. 2;

MSC-A - Subscriber Zone A Switch, pos. 3;

MSC / HLR-B switch / home base of subscriber B, item 4;

SMSC - short message center, pos. 5;

TMSC - transit switch of the first MCA platform, pos. 6;

the first platform (MCA) is the platform on which the Missed Call Alert service is implemented, pos. 7;

the second platform is a service platform that makes a separate short call to the called party, pos. 8.

The first variant of the claimed method in General contains the following steps:

- provide the mobile phone of the caller 1 access to the mobile network;

- receive from the mobile phone of the calling subscriber 1 the call initiated by him to the telephone of the called subscriber 2;

- when establishing a connection with the mobile phone of the called party 2, from the telephone of the calling party 1, a call signal is sent to the switch of the calling party 3, and from the switch of the calling party 3, the call signal is sent to the switch of the called party 4;

- if the mobile phone of the called subscriber is outside the coverage area of the network, from the switch of the called subscriber 4 the signal is redirected to the first platform (MCA) 7 through the transit switch 6, from which the end signal is sent to the mobile phone of the calling subscriber 1 and the call initiated by the calling subscriber 1 is interrupted;

- determine the moment the called subscriber 2 appears on the network using the first platform 7 by sending a signal through the short message transfer center 5 to the called subscriber’s switch 4 SMS messages intended for receiving by the mobile phone subscriber 2, receiving a response message from SMSC about the fact of SMS message delivery over the communication network to the called party;

- from the first platform 7 send a short call signal to the mobile phone of the called subscriber 2 and after receiving the signal they disconnect from the telephone of the called subscriber 2;

- from the first platform 7 through the short message transfer center 5 to the caller’s switch 3 send an SMS message about the availability of the called subscriber;

- the caller’s switch 3 delivers an SMS message to the mobile phone of the caller 1 about the availability of the called subscriber.

Example 1. A specific example of the method according to option 1.

1. Subscriber A calls subscriber B, the MS-A telephone sends a call to MSC-A (the switch where MS-A is registered).

2. MSC-A sends a MAP SRI request to HLR-B and receives in response the address of the MSC-B switch where the MS-B phone was registered.

3. The MSC-A sends a call to the MSC-B as an ISUP IAM / SIP-I INVITE.

4. At the moment, the MS-B mobile phone is out of network coverage, so the MSC-B forwards the call to the platform number (MCA) through the TMSC.

5. TMSC, using SIP-I INVITE, sends a call to the platform (MCA), the MCA responds by making a call on the SIP-I code 480 (ISUP cause 20), which extends back to the MS-A telephone.

6. The platform (MCA) sends SMPP (a protocol describing the client’s interaction with the platform’s SMS server for sending SMS and USSD messages) SMS with parameter PID 0x40 with parameter on SMSC for number B.

7. SMSC determines the current location of MS-B by request of MAP SRI4SM in HLR-B, in response receives the address of the MSC-B switch, where the MS-B mobile phone is now registered, provided that it is already in the communication zone; the received address of the MSC-B switch may change compared to that in clause 2; The SMSC may periodically repeat the MAP SRI4SM and / or use the MAP ReportSmDeliveryStatus request to the HLR-B to receive notification that MS-B is ready to receive SMS (the appearance of subscriber B in the network).

8. SMSC sends SMS with PID parameter 0x40 as MAP MT-FSM to MSC-B.

9. MSC-B delivers SMS with PID parameter 0x40 to MS-B.

10. MSC-B notifies SMSC of SMS delivery with PID parameter 0x40.

11. SMSC notifies the platform (MCA) of SMS delivery with PID parameter 0x40.

12. The Platform (MCA) initiates a short call as SIP-I INVITE on the MSC for number B.

13. The TMSC sends the MAP SRI request to the HLR-B and receives in response the address of the MSC-B switch, where the MS-B mobile phone is now registered.

14. The TMSC initiates a short call as an ISUP IAM / SIP-I INVITE on the MSC-B.

15. MSC-B initiates a short call to MS-B, the call signal is turned on on this phone, MS-B sends an indication of the ongoing call (Alerting / ISUP CPG / SIP-I 180 Ringing) via the MSC-B / TMSC / platform (MCA) and platform (MCA) beats a short call (SIP-I CANCEL / ISUP REL) along the TMSC / MSC-B / MS-B chain.

16. The platform (MCA) sends SMPP (a protocol describing the client’s interaction with the platform’s SMS server for sending SMS and USSD messages) informational SMS to SMSC for number A.

17. SMSC determines the current location of MS-A by request MAP SRI4SM in HLR-A, in response receives the address of the switch MSC-A, where MS-A mobile phone is now registered.

18. SMSC sends informational SMS in the form of MAP MT-FSM to MSC-A

19. MSC-A delivers informational SMS to MS-A.

The second variant of the claimed method in General contains the following steps:

- provide the mobile phone of the caller 1 access to the mobile network;

- receive from the mobile phone of the calling subscriber 1 the call initiated by him to the device of the called subscriber 2;

- when establishing a connection with the telephone of the called party 2 from the telephone of the calling party 1, the call signal is sent to the switch of the calling party 3, and from the switch 3 of the calling party the call signal is sent to the switch 4 of the called party;

- if the telephone of the called subscriber is outside the coverage area of the network, from the switch 4 of the called subscriber, the signal is redirected to the first platform (MCA) 7 through the transit switch 6, the hook signal is sent from the platform to the telephone of the calling subscriber 1 and the call initiated by the calling subscriber 1 is interrupted;

- determine the moment the called subscriber appears on the network using the first platform (MCA) 7 by sending a signal through the short message center 5 to the called party’s switch 4 SMS messages intended for reception by the subscriber 2, receiving a response message from SMSC about the SMS delivery messages on the communication network to the subscriber 2.

- from the first platform 7, information on the numbers of the calling 1 and called 2 subscribers is sent to the second platform 8 via the REST / SOAP protocol;

- from the second platform 8 send a short call signal to the telephone of the called subscriber 2 and after receiving the signal they interrupt communication with the telephone of the called subscriber 2;

- from the first platform 7 through the center for transmitting short messages 5 to the switch of the caller 3 send an SMS message about the availability of the called subscriber 2;

- the caller’s switch 1 delivers an SMS message to the caller’s phone 1 about the availability of the called party 2

Example 2. A specific example of the method according to option 2.

1. Subscriber A calls subscriber B, the MS-A mobile phone sends a call to MSC-A (the switch where MS-A is registered).

2. MSC-A sends a MAP SRI request to HLR-B and receives in response the address of the MSC-B switch where the MS-B mobile phone was registered.

3. The MSC-A sends a call to the MSC-B as an ISUP IAM / SIP-I INVITE.

4. At the moment, the MS-B mobile phone is out of network coverage, so the MSC-B forwards the call to the first platform (MCA) through the TMSC.

5. TMSC using SIP-I INVITE sends a call to the first platform (MCA), (MCA) in response makes the call hang up using SIP-I code 480 (ISUP cause 20), which extends back to the MS-A telephone.

6. The platform (MCA) sends SMPP SMS with parameter PID 0x40 to SMSC for number B.

7. SMSC determines the current location of MS-B by request of MAP SRI4SM in HLR-B, in response receives the address of the MSC-B switch, where the MS-B mobile phone is now registered, provided that it is already in the network coverage area; the received address of the MSC-B switch may change compared to that in clause 2; The SMSC may periodically repeat the MAP SRI4SM and / or use the MAP ReportSmDeliveryStatus request to the HLR-B to receive notification that MS-B is ready to receive SMS (the appearance of subscriber B in the network).

8. SMSC sends SMS with PID parameter 0x40 as MAP MT-FSM to MSC-B.

9. MSC-B delivers SMS with PID parameter 0x40 to MS-B.

10. MSC-B notifies SMSC of SMS delivery with PID parameter 0x40.

11. SMSC notifies the first platform (MCA) of SMS delivery with parameter PID 0x40.

12. The first platform (MCA) transmits to the second platform (a service platform that makes a separate short call to the called party) via SOAP / XML protocol information about the numbers of subscribers A and B.

13. The second platform sends a short call as SIP-I INVITE to MSC for number B.

14. The TMSC sends the MAP SRI request to the HLR-B and receives in response the address of the MSC-B switch, where the MS-B mobile phone is now registered.

15. The TMSC sends a short call as an ISUP IAM / SIP-I INVITE to the MSC-B.

16. MSC-B sends a short call to MS-B, the call signal is turned on on this phone, MS-B sends an indication of the ongoing call (Alerting / ISUP CPG / SIP-I 180 Ringing) via the MSC-B / TMSC / second the platform and the second platform beats a short call (SIP-I CANCEL / ISUP REL) along the TMSC / MSC-B / MS-B chain.

17. The MCA platform sends SMPP informational SMS to SMSC for number A.

18. SMSC determines the current location of MS-A by request MAP SRI4SM in HLR-A, in response receives the address of the switch MSC-A, where the MS-A mobile phone is now registered.

19. SMSC sends an informational SMS in the form of MAP MT-FSM to MSC-A.

20. MSC-A delivers informational SMS to MS-A.

The difference between the implementation of the method according to option two is the introduction of an additional second platform, which is functionally responsible for generating a call to the subscriber in the signal network. The solution using the second service platform has a high fault tolerance, that is, in case of failure of the first platform (MCA), the functions of the second platform are preserved, and when the second platform fails, the MCA service remains.

Claims (19)

1. A method for managing connections in a mobile communication network when the called subscriber is outside the network coverage area, comprising the following steps: - provide the mobile phone of the calling subscriber (MS-A) access to the mobile communication network; - receive the call initiated by him from the mobile phone of the calling subscriber (MS-A) to the mobile phone of the called subscriber (MS-B); - when establishing a connection with the called party’s mobile phone (MS-B), the calling signal is sent to the calling party’s switch (MSC-A) from the calling party’s telephone (MS-A), and the call signal is sent from the calling party’s switch (MSC-A) to called party switch (MSC-B); - if the called subscriber’s mobile phone is outside the network coverage area, the signal is forwarded from the called subscriber’s switch (MSC-B) to the platform (MCA) through the transit switch (TMSC), from which the end signal is sent to the calling party’s mobile phone (MS-A) and interrupt the call initiated by the caller; - determine the moment the called subscriber appears in the network using the platform (MCA) by sending a signal through the short message service center (SMSC) to the called subscriber’s switchboard (MSC-B) SMS messages intended for the receiving unit to receive the called subscriber and receive a response message from SMSC about the fact of SMS message delivery over the communication network to the called subscriber; - from the platform (MCA) they send a short call signal to the called party’s mobile phone (MS-B) and, after receiving the signal, they disconnect from the called party’s phone (MS-B); - from the platform (MCA) through the short message center (SMSC) to the caller’s switch (MSC-A) send an SMS message about the availability of the called subscriber (MS-B); - the calling party switch (MSC-A) delivers an SMS message to the calling party's mobile phone (MS-A) about the availability of the called party. 2. A method for managing connections in a mobile communication network when the called subscriber is outside the network coverage area, comprising the following steps: - provide the mobile phone of the calling subscriber (MS-A) access to the mobile communication network; - receive from the mobile phone of the calling subscriber (MS-A) the call initiated by him to the device of the called subscriber (MS-B); - when establishing a connection with the called party’s telephone (MS-B), the calling signal is sent to the calling party’s switch (MSC-A) from the calling party’s telephone (MS-A), and the calling signal is sent to the calling station’s switch from the caller’s switch (MSC-A) called party (MSC-B); - if the called subscriber’s mobile phone is outside the network coverage area, the signal is forwarded from the called subscriber’s switch (MSC-B) to the first platform (MCA) through the transit switch (TMSC), from which the end-call signal is sent to the calling party’s mobile phone (MS-A) ) and interrupt the call initiated by the caller (MS-A); - determine the moment the called subscriber appears in the network using the first platform (MCA) by sending a signal through the short message service center (SMSC) to the called subscriber’s switchboard (MSC-B) SMS message intended for receiving the called subscriber and receiving a response message from SMSC on the fact of delivery of SMS messages over the communication network to the called subscriber; - from the first platform (MCA) send information on the numbers of the calling and called subscribers via the REST / SOAP protocol to the second - service - platform; - from the second platform they send a separate short call to the mobile phone of the called party (MS-B) and after receiving the signal, they disconnect from the telephone of the called party (MS-B); - from the first platform (MCA) through the short message center (SMSC) to the caller’s switch (MSC-A) send an SMS message about the availability of the called subscriber; - the calling party switch (MSC-A) delivers an SMS message to the calling party's mobile phone (MS-A) about the availability of the called party.

Images