KR101487483B1 - Method for time reducing of call connection and mobile switching center thereof - Google Patents

Abstract

A first exchanger connected to the called terminal and a switch interlocked with the home user management server, for shortening a voice call connection time of the called terminal, receive a Providing Roaming Number (PRN) including the calling terminal information and the called terminal information from the home user management server, ) Message, it is determined whether the called terminal supports provision of the first service based on the called terminal information included in the PRN message. When the destination terminal supports the provision of the first service, the first exchange requests pre-paging to the destination terminal, and transmits a service request message including the response information about the pre-paging requested from the first exchange and the location information of the destination terminal Upon receipt, it transmits a PRN response message to the home user management server, and receives an IAM (Initial Address Message) message from the second exchange connected to the calling terminal and a paging response message from the called terminal.

Description

TECHNICAL FIELD The present invention relates to a method for shortening a voice call connection time,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for shortening a voice call connection time and an exchange for the method.

In addition to the development of the LTE (Long Term Evolution), users are required to use a 3G mobile communication service network (hereinafter referred to as 3G network) (Hereinafter, referred to as " LTE network " for convenience of description), a communication service is used by using one or two networks together. In this environment, mobile network operators are providing services by introducing CSFB (Circuit Switch Fall Back) technology, which allows users to use data through LTE network and voice through existing 3G networks.

However, since each time a voice service is provided to a user, inter-mobility between the LTE network and the 3G network necessarily occurs, the call connection time to the 3G network for providing voice service becomes long, May occur.

Accordingly, the present invention provides a method for shortening a voice call connection time of a CSFB subscriber using a fourth generation mobile communication service, and an exchange for the method.

According to another aspect of the present invention, there is provided a method for shortening a voice call connection time of a called terminal by exchanging a first exchange connected to a called terminal and a home user management server,

Receiving a PRN (Providing Roaming Number) message including calling terminal information and the called terminal information from the home user management server; Determining whether the called terminal supports provision of the first service based on the called terminal information included in the PRN message; Requesting free-paging to the called terminal by the first exchange if the called terminal supports provision of the first service; Receiving a service request message including response information of the requested pre-paging and location information of the called terminal from the first exchange; And transmitting a PRN response message to the home user management server, and receiving an IAM (Initial Address Message) message and a paging response message from the called terminal from a second exchange connected to the calling terminal.

And requesting paging to the called terminal by the first exchange if the called terminal does not support the provision of the first service in the step of determining whether the called terminal supports the provision of the first service have.

Determining whether the calling terminal supports provision of the first service based on the flag information transmitted from the calling terminal in the step of determining whether the called terminal supports provision of the first service.

Receiving the service request message, the destination terminal receiving a pre-paging message from the first exchange; Transferring an extended service request message for pre-paging to the first exchange; And performing paging.

The extended service request message may include location information of the called terminal and information on whether the called terminal responds to the pre-paging.

According to another aspect of the present invention, there is provided an exchange for shortening a call connection time of a called terminal,

A message receiver for receiving the PRN message requesting the called terminal information and the called exchange information from the home user management server to extract the called terminal information and the calling terminal information and receiving the service request message from the first exchange; A terminal information storage unit for receiving and storing terminal information for each terminal from one or more terminals located in a service area of an exchange; A terminal information confirmation unit for determining whether the called terminal supports the first service based on the information of the called terminal extracted by the message receiver and the terminal information stored in the terminal information storage unit; And a paging request unit for requesting the first exchange to perform pre-paging when the terminal information verifying unit confirms that the called terminal supports the first service.

The exchange may include a service request unit for transmitting a response message to the PRN to the home user management server when the message receiver receives the service request message.

The terminal information verifying unit judges whether the calling terminal supports the first service based on the information of the calling terminal extracted by the message receiving unit and determines whether the first terminal supports the first service based on the flag information included in the calling terminal information Can be determined.

The paging request unit may request paging by the first exchange when the terminal information verifying unit confirms that the called terminal does not support the first service.

According to the present invention, it is possible to shorten the origination delay time or incoming delay time for call connection of an LTE service subscriber, and to provide a quality voice service that provides a service in 3G network.

1 is an exemplary diagram illustrating a general pre-paging procedure.
2 is a structural view of an exchange according to an embodiment of the present invention.
3 is a flowchart illustrating a voice call connection time reduction method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

In this specification, a terminal includes a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS) An access terminal (AT), and the like, and may include all or some of functions of a mobile terminal, a subscriber station, a mobile subscriber station, a user equipment, and the like.

In this specification, a base station (BS) is an access point (AP), a radio access station (RAS), a node B, a base transceiver station (BTS) Mobile Multihop Relay) -BS, and may include all or some of the functions of an access point, a radio access station, a Node B, a base transceiver station, and an MMR-BS.

Hereinafter, a system and a method for shortening a voice call connection time according to an embodiment of the present invention will be described with reference to the drawings.

Before describing an embodiment of the present invention, a general pre-paging procedure will be described with reference to FIG.

1 is an exemplary diagram illustrating a general pre-paging procedure.

As shown in FIG. 1, the general pre-paging does not require the MSC / VLR (Mobile Switching Center / Visitor Location Register) to request paging directly to the mobile station after the GMSC receives an IAM When the MSC / VLR receives a PRN (Provide Roaming Number) request message, it performs paging and provides a PRN ACK or an SRI ACK (Send Routing Information Acknowledge) to the GMSC according to the paging response of the MS.

That is, after the GMSC receives the IAM (S10) and sends SRI (Send Routing Information) to the HLR (S20), the HLR requests a PRN to the MSC / VLR (S30). Then, the MSC / VLR instructs the terminal to paging (S40), and the terminal transmits a paging response according to the paging to the MSC / VLR (S50). The MSC / VLR transmits a PRN response message to the HLR according to the paging response received in step S50 (S60), and the HLR transmits an SRI response message to the GMSC (S70). The GMSC then sends the IAM to the MSC / VLR (S80). The above-mentioned procedure has already been standardized and the detailed description will be omitted in the embodiment of the present invention.

This general pre-paging procedure is used for network transitions in the same network, and the connection time for the call connection becomes longer when transiting between the LTE network and the 3G network to be described in the present invention. Therefore, in the embodiment of the present invention, a system and a method for shortening a call connection time will be described.

2 is a structural view of an exchange according to an embodiment of the present invention.

2, a terminating exchange 100 that requests paging to a called terminal by interworking with a Mobility Management Entity (MME) and a Home Subscriber Server (HSS) of an LTE network includes a message receiving unit A terminal information storage unit 140, a paging request unit 130, and a service request unit 150. The terminal information storage unit 140 stores the terminal information.

The message receiver 110 receives the PRN message requesting the called terminal information and the called exchange information from the home user management server, and extracts the information of the called terminal and the information of the calling terminal from the PRN message. In addition, the message receiver 110 receives a service request message including location information of the called terminal and response information on paging from the LTE switch.

The terminal information confirmation unit 120 determines whether the called terminal supports the LTE service based on the information of the called terminal and the terminal information stored in the terminal information storage unit 140 among the information extracted from the PRN message by the message receiving unit 110 . The terminal information confirmation unit 120 also determines whether the calling terminal supports the LTE service based on the flag information (CS Fallback Mobile Originating Flag) of the information of the calling terminal among the information extracted from the PRN message by the message receiving unit 110 .

The terminal information storage unit 140 receives and stores the terminal information for the terminal from a plurality of terminals located in the service area of the destination switching center 100, respectively. The terminal information is collected and stored from time to time according to the variation of the terminals located in the service area of the destination switching center 100. Since the area of the destination switching center 100 is overlapped with the LTE switching center area, May be received from the LTE switch of the LTE network. The terminal information includes identification information of the terminal, information on whether or not the LTE service is supported, and the like.

The paging request unit 130 confirms that the called terminal supports the LTE service by the terminal information confirmation unit 120, and requests / performs the pre-paging with the LTE switch. However, if the called terminal does not support the LTE service, the general paging procedure is performed / requested by the LTE exchange. This will be described in detail later.

The service request unit 150 transmits a response message to the PRN to the home user management server when the message received by the message receiving unit 110 is a service request message.

A method of shortening a voice call connection time to the LTE CSFB terminal in a communication system environment including the above-described destination exchange will be described with reference to FIG. And a method for shortening a voice call connection time occurring when transitioning from the LTE network to the 3G network when the called terminal uses the data service through the LTE network and uses the voice service through the 3G network at the request of the calling terminal do.

In the embodiments of the present invention, the LTE exchanger may be referred to as a first exchange, the destination exchange as a second exchange, and the originating exchange as a third exchange for ease of explanation. The second exchange and the third exchange are exchanges located in the 3G network.

3 is a flowchart illustrating a voice call connection time reduction method according to an embodiment of the present invention.

As shown in FIG. 3, the originating exchange transmits an SRI message requesting information of the called terminal and information of the called exchange to the home subscriber server (HSS) (S100). At this time, the SRI message includes information on the calling terminal and information (e.g., telephone number) of the called terminal.

In step S101, the home user management server receiving the SRI message transmits a PRN message including information on the calling terminal to the called exchange to request the called terminal information and the called exchange information to the called exchange. The message receiving unit 110 of the called exchange extracts the information of the called terminal and the information of the calling terminal in the PRN message received in step S101. The terminal information checking unit 120 determines whether the called terminal is a terminal capable of providing an LTE service (S102).

That is, in the terminal information storage unit 130, terminal information about a plurality of terminals located in the service area of the terminating switching system 100 is stored in advance, and information on whether the corresponding LTE service can be provided is stored in the terminal information Are included. Therefore, the terminal information verifying unit 120 can check whether or not the terminal for the received paging message can provide the LTE service based on the information stored in the terminal information storing unit 130. Herein, the information used when determining whether or not the called terminal can provide the LTE service will be explained by using the subscriber-specific terminal information (SGs Associated) of the terminal as an example.

In other words, according to the embodiment of the present invention, it is possible to perform the pre-paging according to whether the called terminal can provide the LTE service or to perform the general paging procedure. Also, depending on whether the calling terminal provides the LTE service, it may determine whether or not the pre-paging procedure is performed.

In order to check whether the calling terminal can provide the LTE service, the calling terminal utilizes the CSMO flag that is put on the MM CM-SVC-REQEST message. The message at this time can be represented as shown in Table 1 below.

Additional update parameters value (octet 1, bit 1 to 4)

CSMT (1 bit field)

Bit
One
0 No additional information.
1 CS fallback mobile terminating call

CSMO (1 bit field)

Bit
2
0 No additional information.
1 CS fallback mobile originating call

Bits 4 and 3 of octet 1 are spare and shall be all coded as zero.

In addition, since the network transition procedure must be performed from the 3G network to the LTE network according to whether the called terminal provides the LTE service, a procedure for determining whether or not the LTE service can be provided by the called terminal when the paging is requested by the LTE exchange may be added have. In order to confirm whether or not the called terminal can provide the LTE service, the LTE exchange or the called terminal in the area where the called terminal is located is located, and the destination exchange of the 3G network overlapped with the LTE network collects the information of the called terminal.

If the terminating exchange of the 3G network has collected information of the called terminal, the terminating exchange informs the collected terminal information to the LTE exchange. Then, the LTE switchboard can determine whether or not the corresponding terminal can provide the LTE service based on the subscriber information of the terminal in the information on the called terminal.

If the terminal can provide the LTE service, the paging request unit 130 of the destination exchange transmits a paging message requesting to perform paging including the calling terminal information and the called terminal information to the LTE exchange (S102) . The LTE exchange confirms the called terminal information in the paging message received in step S103 and performs pre-paging to the called terminal (S104).

Since the paging is performed when the destination exchange receives the PRN message before receiving the IAM message, the called terminal transmits an ESR (Extended Service Request) message to the LTE exchange attempting free-paging (S105). Herein, the ESR message includes location information of the called terminal and response information of paging.

Upon receiving the ESR message, the LTE switchboard informs the destination switching center of the status of the called terminal and transmits a service request message for requesting the service (S106). The destination exchange transmits a PRN response message to the home user management server (S107). The home user management server that receives the response transmits the SRI response message including the destination terminal information and the destination exchange information to the originating exchange (S108). Upon receiving the SRI response message including the destination exchange information, the originating exchange transmits an IAM message including the calling number of the calling terminal and the called number of the called terminal to the destination exchange (S109).

At this time, the called terminal performs the paging at any time between steps S104 and S108, and if the called terminal is not busy or paging is successful, the paging response message for call setup is transmitted to the called exchange S110). When the call connection is attempted through this process, the manganese transition time, which is the main time delay factor of the conventional LTE CSFB call connection time, can be shortened through the parallel processing of paging, .

On the other hand, if it is determined in step S102 that the destination terminal can not provide the LTE service, the paging procedure is performed according to a general procedure (S111). Here, the general paging procedure is already known, and a detailed description thereof will be omitted in the embodiment of the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (10)

A method for shortening a voice call connection time of a called terminal by an exchange connected to a first exchange and a home user management server to which a called terminal is connected,
Receiving a PRN (Providing Roaming Number) message including calling terminal information and the called terminal information from the home user management server;
Determining whether the called terminal supports provision of the first service based on the called terminal information included in the PRN message;
Requesting free-paging to the called terminal by the first exchange if the called terminal supports provision of the first service;
Receiving a service request message including response information of the requested pre-paging and location information of the called terminal from the first exchange; And
Transmitting a PRN response message to the home user management server, receiving an IAM (Initial Address Message) message from a second exchange connected to the calling terminal and a paging response message from the called terminal
Lt; / RTI >
In the step of determining whether the called terminal supports provision of the first service,
And requesting paging to the called terminal by the first exchange if the called terminal does not support the provision of the first service.
delete The method according to claim 1,
In the step of determining whether the called terminal supports provision of the first service,
Determining whether the calling terminal supports providing the first service based on the flag information transmitted from the calling terminal
Wherein the voice call connection time reduction method further comprises: The method according to claim 1,
In the step of receiving the service request message,
Receiving a pre-paging message from the first exchange;
Transferring an extended service request message for pre-paging to the first exchange; And
Performing paging
And a voice call connection time reduction method. 5. The method of claim 4,
Wherein the extended service request message includes location information of the called terminal and information on whether or not the called terminal responds to the pre-paging. The method according to claim 1,
The first service is an LTE (Long Term Evolution) service,
Wherein the exchange and the second exchange are exchanges for providing 3G services. A switching center for shortening a voice call connection time of a called terminal,
A message receiver for receiving the PRN message requesting the called terminal information and the called exchange information from the home user management server to extract the called terminal information and the calling terminal information and receiving the service request message from the first exchange;
A terminal information storage unit for receiving and storing terminal information for each terminal from one or more terminals located in a service area of an exchange;
Wherein the message reception unit determines whether the called terminal supports the first service based on the information of the called terminal extracted by the message receiver and the terminal information stored in the terminal information storage unit, Determining whether the first service is supported or not, and determining whether the first service is supported based on the flag information included in the information of the calling terminal; And
The terminal information verifying unit confirms that the called terminal supports the first service. The paging request unit requests the first exchange to perform pre-
Lt; / RTI > 8. The method of claim 7,
When the message receiving unit receives the service request message, the service request unit transmits a response message to the PRN to the home user management server.
Lt; / RTI > delete 8. The method of claim 7,
Wherein the paging request unit requests paging by the first exchange when the terminal information verifying unit confirms that the called terminal does not support the first service.

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