KR20120037596A - System and method for providing of call forwarding service between heterogeneous network - Google Patents

System and method for providing of call forwarding service between heterogeneous network Download PDF

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Publication number
KR20120037596A
KR20120037596A KR1020100099145A KR20100099145A KR20120037596A KR 20120037596 A KR20120037596 A KR 20120037596A KR 1020100099145 A KR1020100099145 A KR 1020100099145A KR 20100099145 A KR20100099145 A KR 20100099145A KR 20120037596 A KR20120037596 A KR 20120037596A
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South Korea
Prior art keywords
call
request message
communication
information
exchange
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KR1020100099145A
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Korean (ko)
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김경훈
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에스케이 텔레콤주식회사
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Priority to KR1020100099145A priority Critical patent/KR20120037596A/en
Publication of KR20120037596A publication Critical patent/KR20120037596A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/18—Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to a system and method for providing a call forwarding service between heterogeneous networks, comprising: a first communication exchanger for transmitting a called location information request message to a home location register according to a call origination of a calling terminal; When the location information request message is received, the subscriber information is used to determine the location of the called terminal and call forwarding service registration, and routing information including call forwarding information when the called terminal is roaming overseas and registered with the call forwarding service. A home location register that transmits a request message to a global location register, and upon receiving a routing information request message from the home location register, receives the routing information by transmitting the routing information request message to a second communication switch while storing the call forwarding information. And forwarding a call from the second communication switch. When a call direction change request message is received, the first communication mode switch converts the call direction change request message into a call setup retry request message that is recognizable by the first communication method switch and includes the call forwarding information. Paging the called terminal according to a call connection request from the first communication method exchange, and transmitting a call direction change request message to the global location register if a response is not received from the called terminal; Includes two communication exchanges.
Therefore, according to the present invention, the WCDMA network subscribers can provide a call forwarding service even when the CDMA subscriber does not answer the call or is in the shadowed area when talking with the CDMA subscriber who is roaming overseas.

Description

System and method for providing call forwarding service between heterogeneous networks {System and Method for providing of call forwarding service Between Heterogeneous Network}

The present invention relates to a system and a method for providing a call forwarding service between heterogeneous networks, and more particularly, a wideband code division multiple access (WCDMA) subscriber requests a call division to a code division multiple access (CDMA) subscriber who is roaming abroad, If an incoming response is not received from the WCDMA exchange, the global location register converts the call direction change request message for the call forwarding from the CDMA exchange into a call setup retry request message in a format recognizable by the WCDMA exchange. The present invention relates to a call forwarding service providing system and method between heterogeneous networks that retry call setup using call forwarding information included in the call setup retry request message.

Recently, with the rapid increase in mobile communication demand, global roaming services are being provided to the globalization market, away from calls among domestic subscribers, and the number of subscribers is increasing rapidly.

In general, when moving from a home network of multiple networks operated by different operators to a visitor network, the visitor network acquires location information of a terminal moved from the home network and based on the acquired information. A roaming service is provided to enable a call service to a terminal.

Overseas roaming service means that a mobile subscriber can continue to receive a mobile communication service using a mobile communication terminal identical to his / her phone number in another country.

With the recent improvement in the standard of living of the people and the demand for globalization socially, the number of outbound countries is increasing rapidly. As a result, the demand for overseas roaming service that provides mobile communication services in other countries is rapidly increasing. There is a trend.

1 is a diagram illustrating a method for providing a call forwarding service when a conventional WCDMA network origination is received from a foreign CDMA network.

Referring to FIG. 1, when a WCDMA subscriber of a home network sends a call to a called party roaming to an overseas CDMA network, the WCDMA switch of the home network transmits a called location information request message to a home location register (S100).

The home location register sends a routing information request message to the CDMA exchange through a GLR (Global Location Register, hereinafter called Global Location Register) of the visited network for setting up a call to the destination terminal upon receipt of the called location information request message. It transmits (S102). That is, the home location register determines whether the called party is roaming abroad by using subscriber information, and when the called party is roaming overseas, transmits a routing information request message to the CDMA exchange through the global location register of the visited network.

The CDMA switch detects routing information for call establishment with the called terminal and transmits the routing information to the home location register of the home network through the global location register (S104).

Then, the home location register transmits the destination location information based on the routing information from the CDMA switch to the WCDMA switch (S106), and the WCDMA switch makes a call connection to the CDMA switch based on the destination location information. Request (S108).

The CDMA switch pages the called terminal according to the call connection request (S110), and determines whether an incoming response is received from the called terminal (S112).

As a result of the determination of S112, when an incoming response is received from the called terminal, the CDMA exchange connects a call with the calling terminal (S120).

If, as a result of the determination in S112, when an incoming response is not received from the called terminal, the CDMA exchange transmits a call direction change request message for a call forwarding service to the global location register (S114). The call direction change request message is transmitted to the WCDMA switch of the home network (S116).

Then, the WCDMA exchange does not recognize the call direction change request message (S118).

In the above method, the global location register transmits a call direction change request message to the WCDMA switch for the call forwarding service, but the WCDMA switch does not recognize the CDMA protocol and causes an error.

That is, if a WCDMA subscriber attempts to talk to a subscriber who has roamed to an overseas CDMA network, but a call forwarding occurs because the called subscriber is located in No Answer or shadowed area, the WCDMA exchange does not recognize the call direction change request message from the CDMA switch. There is a problem that the call forwarding service is not provided.

In addition, since the originating network is a WCDMA network and the terminating network is a CDMA network, there is a disadvantage in that a call forwarding service cannot be provided because the mobile communication protocol for call forwarding is different.

An object of the present invention is to provide a call forwarding service system and a method for providing a call forwarding service between heterogeneous networks, even when a WCDMA network subscriber attempts a call connection to a CDMA subscriber who is roaming abroad, but the call connection fails.

Another object of the present invention is a heterogeneous network that provides a function of converting a mobile application part (MAP) message between a CDMA network and a WCDMA network when a WCDMA network subscriber attempts to connect a call to a CDMA subscriber but needs a call transfer because the call connection fails. To provide a call forwarding service providing system and method.

Another object of the present invention is to provide a call forwarding service system and method for providing a call transfer between heterogeneous networks capable of connecting a call according to the busy state of a called terminal in a CDMA exchange and a WCDMA exchange.

According to an aspect of the present invention to achieve the above object, a first communication type switch for transmitting a destination location information request message to a home location register according to the call origination of the calling terminal, the destination location information request from the first communication type exchange When the message is received, it is determined by using the subscriber information to determine the location of the destination terminal and whether the call forwarding service is registered, and if the destination terminal is roaming overseas and registered in the call forwarding service, the routing information request message including call forwarding information is global. When receiving a routing information request message from the home location register and the home location register, the routing information request message is transmitted to a second communication mode exchange while receiving the call forwarding information to receive routing information. 2 Call direction change for call forwarding from communication exchange When the request message is received, the call direction change request message is converted into a call setup retry request message that can be recognized by the first communication type exchange and includes the call forwarding information, and is transmitted to the first communication type exchange. A second communication switch that pages the destination terminal according to a call connection request from a location register and the first communication switch, and transmits a call direction change request message to the global location register when a response is not received from the destination terminal; Provided is a call forwarding service providing system between heterogeneous networks including a.

The first communication exchange may be a WCDMA exchange, and the second communication exchange may be a CDMA exchange.

 When receiving the call direction change request message, the global location register determines the communication method of the calling party by using the first communication method switch information, and if the communication method of the calling party does not correspond to the called party, the call direction. The change request message is converted into a call establishment retry request message in a format recognizable by the first communication exchange.

The first communication mode exchange receives routing information from the global location register through a home location register, and requests a call connection based on the routing information.

The first communication mode exchange retries the call connection using the call forwarding information included in the call setup retry request message.

 According to another aspect of the present invention, an interface unit for communicating with a home location register or a first communication mode switch to transmit and receive information necessary for communication connection with the first communication type mobile communication network, routing information from the home location register When the request message is received, the routing information request processing unit for storing the call forwarding information contained in the routing information request message, and requests and receives the routing information to the second communication mode switch to the home location register, the first information; When a call direction change request message for call forwarding is received from the second communication switch as a result of the call connection request of the communication switch, the communication method for determining the calling party communication method using the first communication switch information. The determining unit, if the calling party communication method does not correspond to the called party, the call direction change request message. Whether the group is provided with the global location register containing the calling party communication system recognizes the call set-up in a format that retries be converted into a request message to the first portion (Mobile Application Part) MAP converted to be transmitted to communication system exchange.

The first communication exchange may be a WCDMA exchange, and the second communication exchange may be a CDMA exchange.

The call direction change request message may be in 2G MAP format, and the call establishment retry request message may be in 3G MAP format.

The MAP converting unit includes the stored call forwarding information in the call setup retry request message and transmits it to the first communication type exchange, and the first communication type exchange uses the call forwarding number included in the call forwarding information. Retry the call setup.

According to another aspect of the present invention, if a subscriber information database storing subscriber information and a call location information request message is received from the first communication type exchange, the subscriber information database is searched to determine the location of the called terminal and whether the call forwarding service is registered. And a subscriber information search unit for determining that the called terminal is roaming overseas and registered in the call forwarding service, and transmits a routing information request message including the call forwarding information to a global location register in which the called terminal is located. A home location register is provided that includes a routing information processor that receives routing information from a location register and transmits the routing information to the first communication type exchange.

The subscriber information search unit searches the subscriber information database to determine whether the called terminal is roaming abroad.

The routing information request message may include at least one of source terminal information, first communication type exchange information, temporary number allocated for call processing classification, called terminal information, and call forwarding information.

According to another aspect of the present invention, (a) the first communication method switching unit transmits the incoming location information request message to the home location register according to the call origination of the calling terminal, (b) the home location register destination location information; Upon receiving the request message, determine the location of the called terminal and call forwarding service registration, and if the called terminal is roaming overseas and registered with the forwarding service, transmitting a routing information request message including call forwarding information to a global location register. (B) storing, by the global location register, call forwarding information included in the routing information request message, and transmitting a routing information request message to a second communication mode switch in which the called terminal is located; and (c) the global location register. The location register receives routing information from the second communication mode switch and the first communication is performed through the home location register. Transmitting to a mode exchange, (d) the first communication mode exchange requesting a call connection to the second communication mode exchange based on the routing information, and (e) the second communication mode exchange to the call connection Paging the called terminal according to the request, and if a call response is not received from the called terminal, transmitting a call direction change request message for call forwarding to the global location register; (f) the global location register sends the call direction Converting the change request message into a call setup retry request message recognizable by the first communication exchange and including the call forwarding information and transmitting the change request message to the first communication exchange, and (g) the first communication exchange The call between the heterogeneous networks comprising the step of retrying the call connection using the call forwarding information contained in the call setup retry request message Provided is a method for providing a switching service.

In step (f), when the call direction change request message is received from the second communication method switch, determining the calling party communication method using the first communication method switching information, and the calling party communication method is determined by the called party. If not, the method may include converting the call direction change request message into a call setup retry request message in a format recognizable by the calling party communication method, and transmitting the message to the first communication method switch.

According to another aspect of the present invention, a method for providing a call forwarding service in a global location register, the method comprising: (a) when a routing information request message is received from a first communication exchange, a call forwarding included in the routing information request message; Transmitting the routing information request message to the second communication exchange while storing the information; (b) receiving routing information from the second communication exchange and transmitting the routing information request to the first communication exchange through the home location register; (c) when a call direction change request message for call forwarding is received from the second communication mode switch as a result of the call connection request of the first communication mode switch, the call direction change request message is transmitted to the first communication method; Converts to a call setup retry request message in a format recognizable by the communication exchange and transmits it to the first communication exchange. Is a call forwarding service providing method of heterogeneous including the step is provided.

In step (c), when the call direction change request message is received from the second communication method exchange, determining the calling party communication method using the first communication method switching information, and the calling party communication method is determined by the called party. If it does not correspond, convert the call direction change request message into a call setup retry request message in a format recognizable by the calling party communication method, and include the call forwarding information in the converted call setup retry request message. And transmitting to the first communication exchange.

The first communication exchange may be a WCDMA exchange, the second communication exchange may be a CDMA exchange, the call direction change request message may be in 2G MAP format, and the call establishment retry request message may be in 3G MAP format.

According to another aspect of the present invention, in a method for a home location register to provide a call forwarding service, when a destination location information request message is received from a first communication type exchange, a subscriber information database is searched to search for a destination terminal abroad. Determining whether roaming and call forwarding services are registered, and when the called terminal is roaming overseas and registered in the call forwarding service, a routing information request message including call forwarding information is globally located in the visited network in which the called terminal is located. Transmitting to the registrar, and transmitting routing information from the global location register to the first communication type exchange to allow a call connection to the destination terminal based on the routing information. A service provision method is provided.

As described above, according to the present invention, when WCDMA network subscribers request a call connection with a CDMA subscriber who is roaming overseas, the CDMA subscriber can provide a call forwarding service even when the CDMA subscriber does not answer or is in a shadowed area.

In addition, when a WCDMA network subscriber attempts to connect a call to a CDMA subscriber, but the call connection fails and call forwarding is required, the WCDMA network subscriber may provide a function of converting a MAP message between the CDMA network and the WCDMA network.

In addition, it is possible to connect a call call according to the busy state of the called terminal in the CDMA exchange and the WCDMA exchange period.

1 is a flow chart illustrating a call forwarding service when a conventional WCDMA network originating overseas CDMA network is called.
2 is a diagram illustrating a system for providing call forwarding service between heterogeneous networks according to an embodiment of the present invention.
Figure 3 is a block diagram schematically showing the configuration of a home location register according to the present invention.
4 is a block diagram schematically showing the configuration of a global location register according to the present invention;
5 is a diagram illustrating a method for providing call forwarding service between heterogeneous networks when WCDMA is a calling party and a CDMA is called party according to an embodiment of the present invention.

The foregoing and other objects, features, and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

2 is a diagram illustrating a call forwarding service providing system between heterogeneous networks according to an embodiment of the present invention.

Referring to FIG. 2, when the call transfer service providing system between heterogeneous networks makes a call to the called terminal 310 where the calling terminal 210 of the home network 100 has roamed overseas, the called terminal 310 has a response. If there is no call forwarding service.

In this case, the calling terminal 210 is in a home network 200 using a wideband code division multiple access (WCDMA) communication method, and the called terminal 310 uses a code division multiple access (CDMA) communication method. The visited network 300 is used.

The home network 200 using the WCDMA communication method includes a base station 220, a WCDMA switch 230, and a home location register (HLR) 240.

The base station 220 performs radio signal transmission and reception, radio channel encoding and decoding, signal strength and quality measurement, baseband signal processing, diversity, radio resource management, and self maintenance.

The base station 220 described above may be referred to as a WCDMA base station, Node B. Accordingly, the WCDMA base station 220 performs a radio access termination function with the WCDMA mobile communication terminal 210 according to the 3GPP radio access standard, performs a function of transmitting and receiving voice, video and data traffic in the WCDMA manner, and transmits and receives antennas. It transmits and receives information with the WCDMA mobile communication terminal 210 through.

The WCDMA switch 230 is responsible for mobility management, location registration / management, authentication, handover, roaming, etc. of the terminals (210, 310), and also the location of the mobile communication terminals in each base station through the VLR (Visitor Location Register) The registration information is updated and stored, and the changed location registration information of the terminals is transmitted to the home location register 208 which manages the location registration information of the terminal so that the location information of the mobile communication terminal is periodically updated.

In addition, when the WCDMA switch 230 receives a call request from the mobile communication terminal 210 of the home network 200 to the called terminal 310 that applied for roaming abroad, the WCDMA switch 230 is located in the CDMA switch (where the called terminal 310 is located) ( The incoming call request is sent to 330 to form a call path. That is, the WCDMA switch 230 requests a call connection to the CDMA switch 330 when routing information is received from the home location register 240.

In addition, the WCDMA switch 230 assigns a temporary number for distinguishing call processing according to the origination of the call from the calling terminal 210, and sends a call location information request message including the assigned temporary number to the home location register 240. To send.

In addition, when the WCDMA switch 230 receives the call setup retry request message from the global location register 240 of the visited network 300, the WCDMA switch 230 releases the previous call processing for the originating terminal 210, The call connection is retried using the routing information included in the call setup retry request message. That is, the WCDMA switch 230 retries the call connection using the call forwarding information (or call forwarding number) included in the routing information.

The home location register 240 stores and manages subscriber information, additional service information for each subscriber, and location information of the mobile terminal. In particular, the home location register 240 stores profile information of the mobile terminals 210 and 310. This profile information includes the subscriber's telephone number (MSISDN), IMSI, subscribed additional service information, and the like.

In addition, the home location register 240 transmits routing information received from the global location register 340 to the WCDMA switch 230 when the called terminal 310 roams abroad. That is, if the digit of the routing information received from the incoming CDMA switch 330 is an international Temporary Local Directory Number (TLDN), the home location register 240 sets the international telephone code set by the subscriber managed in the subscriber profile. Is inserted into the international TLDN and transmitted to the WCDMA switch 230.

In addition, when the destination location information request message is received from the WCDMA exchange 230, the home location register 240 determines whether the called party is roaming overseas and the call forwarding service is registered using the subscriber information. When roaming overseas and registered in the call forwarding service, the routing information request message including the call forwarding information is transmitted to the global location register 340 of the visited network 300.

The visited network 300 is composed of a base station 320, a CDMA switch 330, and a global location register (GLR) 340 that relays global roaming calls.

When the routing information request message is received from the home location register 240, the global location register 340 stores the call forwarding information included in the routing information request message and a temporary number assigned to distinguish call processing. Save it.

In addition, when the call direction change request message is received from the CDMA switch 330, the global location registerer 340 requests a call establishment retry in a format recognizable by the WCDMA switch 230. The message is converted into a Resume Call Handling (RCH) and transmitted to the WCDMA switch 230.

That is, the global location register 340 determines the calling party communication method using WCDMA switch information, and if the calling party communication method does not correspond to the called party, sends the call direction change request message to the calling party communication method ( That is, the WCDMA exchange converts the call establishment retry request message into a format recognizable. In this case, the call direction change request message received from the CDMA switch 330 is in a 2G Mobile Application Part (MAP) format, and does not correspond to the calling party communication method (ie, WCDMA). The call direction change request message in the MAP format is converted into a call setup retry request message in the 3G MAP format and transmitted to the WCDMA switch 230. The call setup retry request message includes call forwarding information.

In addition, when receiving a routing information request message from the home location register 240, the global location registerer 340 requests and receives routing information from the CDMA exchanger 330 and transmits the WCDMA through the home location register 240. To the exchange 230.

In addition, the global location register 340 relays a global roaming call in the home network 200 and the visited network 300. For example, when the subscriber 210 of the home network 200 originates a call to the called terminal 310 roaming into the visited network, the outgoing call is visited via the home location register 240 of the home network 200. Is transmitted to the global location register 340, and the global location register 340 of the visited network 300 transmits the forwarded outgoing call to the called terminal 310 via the CDMA switch 330.

The CDMA switch 330 is a destination switch, paging the destination terminal 310 in response to a call connection request from the WCDMA switch 230, and if the response is not received from the destination terminal 310 to the call forwarding service In order to transmit the call direction change request message to the global location register (340). The call direction change request message is a call direction change request message of 2G MAP, and is a message for requesting call forwarding. The failure of the incoming call may include, for example, no answer, no paging, busy, call waiting no answer, etc. of the called terminal 310 for the call.

In addition, when the call connection request message is received from the global location registerer 340, the CDMA switcher 330 pages the called terminal 310 to connect the call with the calling terminal 210.

The base station 320 is a CDMA base station, performs a wireless access termination function with the CDMA mobile communication terminal 310 according to the 3rd Generation Partnership Project 2 (3GPP2) wireless access standard, and performs voice, video, and data traffic. It performs a function of transmitting and receiving by the CDMA method, and transmits and receives information with the CDMA mobile communication terminal 310 through the transmission and reception antenna.

In the system configured as described above, if the WCDMA mobile communication terminal 210 fails to make a call call connection to the CDMA mobile communication terminal 310 when the WCDMA switch 230 is the calling party and the CDMA switch 330 is the receiving party, the CDMA The exchange 320 changes the call direction change request message REDREQ, which is a CDMA MAP message, to a call setup retry request message, which is a WCDMA MAP message, and transmits it to the WCDMA exchange 230 for the call forwarding service. Accordingly, the WCDMA switch 230 retries the call connection using the call forwarding number included in the call setup retry request message.

The WCDMA network subscriber can provide a call forwarding service even if the WCDMA subscriber attempts to connect a call to a CDMA subscriber who is roaming overseas, but the call connection fails.

3 is a block diagram schematically showing the configuration of a home location register according to the present invention.

Referring to FIG. 3, the home location register 240 includes a subscriber information database 242 storing subscriber information, a subscriber information retrieval unit 244, and a routing information processing unit 246.

The subscriber information database 242 stores subscriber registration call forwarding service registration, location information of a mobile communication terminal, and the like.

When the subscriber location information request message is received from the WCDMA exchange, the subscriber information retrieval unit 244 searches the subscriber information database 242 to determine the location of the destination terminal and whether to register the call forwarding service.

In addition, the subscriber information search unit 244 searches the subscriber information database 242 to determine whether the destination terminal roaming abroad.

When the called terminal is roaming overseas and registered in the call forwarding service, the routing information processing unit 246 generates a routing information request message including call forwarding information and transmits the message to the global location register where the called terminal is located. Here, the routing information request message includes source terminal information, WCDMA switch information, called terminal information, temporary number assigned for call processing classification, and call forwarding information.

4 is a block diagram schematically showing the configuration of a global location register according to the present invention.

Referring to FIG. 4, the global location register 340 may include an interface unit 342, a routing information request processor 344, a communication method determination unit 346, a mobile application part (MAP) converter 348, and subscriber information storage. The unit 350 is included.

The interface unit 342 communicates with a home location register or an originating exchange to transmit and receive information necessary for a communication connection with an originating network.

When the routing information request processor 344 receives the routing information request message from the home location register, the routing information request processing unit 344 stores the call forwarding information included in the routing information request message and a temporary number assigned to distinguish call processing. And store routing information at 350 and request and receive routing information from the CDMA exchange.

The communication method determination unit 346 receives a call direction change request message for call forwarding from the CDMA switch as a result of a call connection request from the WCDMA switch. Determine the communication method.

The MAP converting unit 348 corresponds to the calling communication method by requesting a call direction change request message from the CDMA switch when the calling communication method determined by the communication method determining unit 346 does not correspond to the called party. The call setup retry request message is converted into a WCDMA exchange. In this case, the call setup retry request message may include a call forwarding number included in the call forwarding information.

That is, since the communication method of the calling party is WCDMA and the communication method of the called party is CDMA, and the communication method of the calling party and the called party is different, the MAP converter 348 changes the call direction of the 2G MAP received from the CDMA switch. The request message is converted into a call setup retry request message of 3G MAP recognizable by the WCDMA exchange.

Then, the WCDMA exchange recognizes that it is a call forwarding service and retries the call setup using the call forwarding number included in the call forwarding information.

The subscriber information storage unit 350 stores call forwarding information for each called terminal and a temporary number assigned to distinguish call processing.

5 is a diagram illustrating a method for providing call forwarding service between heterogeneous networks when WCDMA is a calling party and a CDMA is called party according to an embodiment of the present invention.

Referring to FIG. 5, when a WCDMA subscriber of a home network sends a call to a called party roaming to an overseas CDMA network, the WCDMA exchange of the home network transmits a called location information request message to a home location register (S500). In this case, the WCDMA switch allocates a temporary number for distinguishing call processing according to a call origination of the calling terminal, and transmits a called location information request message including the assigned temporary number to the home location register.

The home location register transmits a routing information request message to a global location register of a visited network to establish a call to a called terminal according to the reception of the called location information request message (S502). That is, when the called location information request message is received from the WCDMA exchange, the home location register determines the location of the called terminal and the call forwarding service registration using the stored subscriber information. If the called terminal is roaming overseas and registered in the call forwarding service, the home location register transmits a routing information request message including call forwarding information and the assigned temporary number to the global location register of the visited network. The routing information request message includes call forwarding information, the assigned temporary number, WCDMA switch information, calling terminal information, called terminal information, and the like.

When the step S502 is performed, the global location register stores the call forwarding information and the temporary number included in the routing information request message received from the home location register (S504), and the routing information request message is sent to the CDMA exchange where the called terminal is located. It transmits (S506). Here, the call forwarding information refers to a call forwarding number for providing a call forwarding service.

The CDMA exchange transmits routing information including the international TLDN to the home location register of the home network through the global location register in response to the routing information request (S508). That is, the CDMA switch detects routing information for call establishment with the called terminal and transmits the routing information to the home location register of the home network through the global location register.

Then, the home location register sends the destination location information based on the routing information from the CDMA switch to the WCDMA switch (S510), and the WCDMA switch makes a call connection to the CDMA switch based on the destination location information. Request (S512).

The CDMA switch pages the called terminal according to the call connection request (S514), and determines whether an incoming response is received from the called terminal (S516).

If the incoming response is not received from the called terminal as a result of the determination of S516, the CDMA exchange transmits a call direction change request message to the global location register for a call forwarding service (S518). The call direction change request message is in 2G MAP format.

Here, the failure of an incoming call due to no paging is explained, but the failure of an incoming call due to No Answer, Busy, Call Waiting No Answer, etc. is used as an example. Can be.

When the S518 is performed, the global location register determines the communication method of the calling party by using outgoing exchange information (ie, WCDMA switch information) so that the call direction change request message can be recognized by the calling exchange (WCDMA exchange). The call setup retry request message (ie, routing information of 3G MAP) is converted (S520), and then transmitted to the WCDMA switch (S522). That is, when the call direction change request message is received from the CDMA switch, the global location register determines the communication method of the calling party using the information that the originating switch uses the WCDMA switch.

Then, the global location register determines whether the calling party communication method and the called party communication method correspond, and if it does not correspond, the call including routing information of 3G MAP that can recognize the call direction change request message in the calling party communication method. It converts the configuration retry request message and sends it to the WCDMA exchange which is the originating exchange.

In other words, the global location register converts the call direction change request message of the 2G MAP received from the CDMA exchange into a call setup retry request message of the 3G MAP and transmits the message to the WCDMA exchange.

Then, the WCDMA exchange retries the call connection using the call forwarding number included in the call setup retry request message (S524). That is, when the WCDMA exchange receives the call establishment retry request message, the WCDMA exchange releases the call processing for the calling terminal and retries the call connection using the called telephone number.

If it is determined in S516 that the incoming call is successfully connected with the called terminal, the CDMA exchange performs a call connection with the calling terminal at the request of the WCDMA exchange (S526).

When the incoming call fails when the WCDMA exchange is the calling party and the CDMA exchange is the called party, the CDMA exchange sends a 2G MAP call direction change request message to the global location register for the call forwarding service. Converts the call direction change request message of the 2G MAP into the call reset request message of the 3G MAP and transmits it to the WCDMA switch. Then, the WCDMA switch re-requests a call connection to the CDMA switch based on the call transfer information included in the call reset request message of the 3G MAP, thereby making a call call through MAP signaling conversion faster and easier between the CDMA network and the WCDMA network. Interlocking for connection is possible.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

As described above, the system and method for providing a call forwarding service between heterogeneous networks according to the present invention enables the CDMA subscribers to use the call forwarding service even when the CDMA subscribers do not answer the call or are in the shadowed area when the WCDMA network subscribers are talking with the CDMA subscribers who are roaming abroad. Applicable to the technology.

200: home network 210, 310: mobile terminal
220, 320: base station 230: WCDMA switch
240: home location register 300: visit network
330: CDMA switch 340: Global location register (GLR)

Claims (19)

A first communication type switch for transmitting a called location information request message to a home location register according to a call origination of a calling terminal;
When the called location information request message is received from the first communication method switch, it is determined using the stored subscriber information to determine the location of the called terminal and the call forwarding service, and the called terminal is roaming overseas and is registered to the call forwarding service. A home location register for transmitting the routing information request message including the call forwarding information to the global location register of the visited network;
When the routing information request message is received from the home location register, the routing information request message is transmitted to a second communication mode exchange while storing the call forwarding information to receive routing information, and for the call forwarding from the second communication mode exchange. When a call direction change request message is received, the call direction change request message is recognized by the first communication method exchange and is converted into a call setup retry request message including the call forwarding information, and the first communication method switch is transmitted to the first communication method exchange. Transmitting a global location register; And
A second communication mode switch that pages the destination terminal according to a call connection request from the first communication mode exchange, and transmits a call direction change request message to the global location register when a response is not received from the destination terminal;
Call forwarding service providing system between heterogeneous networks comprising a.
The method of claim 1,
And the first communication exchange is a WCDMA exchange, and the second communication exchange is a CDMA exchange.
The method of claim 1,
When receiving the call direction change request message, the global location register determines the communication method of the calling party by using the first communication method switch information, and if the communication method of the calling party does not correspond to the called party, the call direction. And a change request message is converted into a call setup retry request message in a format recognizable by the first communication type exchange.
The method of claim 1,
And the first communication mode switch receives routing information from the global location register through a home location register and requests a call connection based on the routing information.
The method of claim 1,
The first communication method switch is a call forwarding service providing system between heterogeneous networks, characterized in that to retry the call connection using the call forwarding information included in the call setup retry request message.
An interface unit for communicating with a home location register or a first communication type exchange to transmit and receive information necessary for communication connection with a first communication type mobile communication network;
When the routing information request message is received from the home location register, routing for storing call forwarding information included in the routing information request message, requesting and receiving routing information from the second communication method exchange, and transmitting the routing information to the home location register. An information request processing unit;
When a call direction change request message for call forwarding is received from the second communication switch as a result of the call connection request of the first communication switch, the calling party communication method is determined using the first communication switch information. Communication method determination unit; And
MAP for converting the call direction change request message into a call setup retry request message of a format recognizable by the calling party communication method when the calling party communication method does not correspond to the called party. Mobile Application Part) conversion unit;
Global location register comprising a.
The method of claim 6,
Wherein the first communication exchange is a WCDMA exchange and the second communication exchange is a CDMA exchange.
The method of claim 6,
The call direction change request message is a 2G MAP format, and the call setup retry request message is a 3G MAP format.
The method of claim 6,
The MAP conversion unit includes the stored call forwarding information in the call setup retry request message and transmits it to the first communication method exchange.
And wherein the first communication type exchange retries the call setup using the call forwarding number included in the call forwarding information.
A subscriber information database storing subscriber information;
A subscriber information retrieval unit for retrieving a location of a called terminal and whether a call forwarding service is registered by searching the subscriber information database when a called location information request message is received from a first communication type exchange; And
When the called terminal is roaming overseas and registered in the call forwarding service, a routing information request message including the call forwarding information is transmitted to a global location register of a visited network where the called terminal is located, and routing information is transmitted from the global location register. Routing information processing unit for receiving and transmitting to the first communication system switch;
Home location register comprising a.
The method of claim 10,
And the subscriber information search unit searches the subscriber information database to determine whether the called terminal is roaming overseas.
The method of claim 10,
The routing information request message includes at least one of source terminal information, first communication type exchange information, temporary number assigned to distinguish call processing, called terminal information, and call forwarding information.
(a) transmitting, by the first communication mode exchange, the called location information request message to the home location register according to the call origination of the calling terminal;
(b) the home location register determines the location of the called terminal and the call forwarding service when the called location information request message is received, and includes routing call forwarding information when the called terminal is roaming overseas and registered in the call forwarding service. Sending an information request message to a global location register of the visited network;
(c) storing, by the global location register, call forwarding information included in the routing information request message, and transmitting a routing information request message to a second communication mode switch in which the called terminal is located;
(d) receiving, by the global location registrar, routing information from the second communication type exchange and transmitting the routing information to the first communication type exchange through the home location register;
(e) the first communication exchange requesting a call connection to the second communication exchange based on the routing information;
(f) the second communication mode exchange pager the called terminal according to the call connection request, and if the incoming response is not received from the called terminal, transmits a call direction change request message for call forwarding to the global location register; step;
(g) the global location register converts the call direction change request message into a call setup retry request message that is recognizable by the first communication type switch and includes the call forwarding information, and transmits it to the first communication type switch. step; And
(h) retrying call connection by using the call forwarding information included in the call setup retry request message, by the first communication mode switch;
Method for providing a call forwarding service between heterogeneous networks, including.
The method of claim 13,
In step (g),
When a call direction change request message is received from the second communication method switch, determining the calling party communication method using the first communication method switch information; And
If the calling party communication method does not correspond to the called party, converting the call direction change request message into a call setup retry request message in a format recognizable by the calling party communication method and transmitting it to the first communication method exchange; Method for providing a call forwarding service between heterogeneous networks, including.
In the method for the global location register to provide call forwarding service,
(a) when the routing information request message is received from the first communication exchange, transmitting the routing information request message to the second communication exchange while storing the call forwarding information included in the routing information request message;
(b) receiving routing information from the second communication switch and transmitting the routing information to the first communication switch through the home location register; And
(c) when a call direction change request message for call forwarding is received from the second communication switch as a result of the call connection request of the first communication switch, the call direction change request message is transmitted to the first communication; Converting a call setup retry request message of a format recognizable by a mode exchange into a first communication mode exchange;
Method for providing a call forwarding service between heterogeneous networks, including.
16. The method of claim 15,
The step (c)
When a call direction change request message is received from the second communication method switch, determining the calling party communication method using the first communication method switch information; And
If the calling party communication method does not correspond to the called party, the call direction change request message is converted into a call establishment retry request message in a format recognizable by the calling party communication method, and the converted call establishment retry request message Including the forwarding information in the forwarding information and transmitting to the first communication mode switch.
16. The method of claim 15,
And wherein the first communication switch is a WCDMA switch and the second communication switch is a CDMA switch.
The method of claim 17,
The call direction change request message is a 2G MAP format, and the call setup retry request message is a 3G MAP format characterized in that the call forwarding service between heterogeneous networks.
In the method for the home location register to provide a call forwarding service,
When the called location information request message is received from the first communication method switch, determining whether the called terminal is roaming overseas and registering the call forwarding service by searching the subscriber information database;
If the called terminal is roaming overseas and registered with a call forwarding service, transmitting a routing information request message including call forwarding information to a global location register of a visited network in which the called terminal is located; And
Transmitting routing information from the global location register to the first communication mode exchange so that a call connection is made with the called terminal based on the routing information;
Method for providing a call forwarding service between heterogeneous networks, including.
KR1020100099145A 2010-10-12 2010-10-12 System and method for providing of call forwarding service between heterogeneous network KR20120037596A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101404559B1 (en) * 2012-07-20 2014-06-09 에스케이텔레콤 주식회사 Apparatus for processing call between heterogeneous networks and method therefor
KR101430238B1 (en) * 2012-02-03 2014-08-18 주식회사 케이티 Method and method of call processing for improving call connection rate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101430238B1 (en) * 2012-02-03 2014-08-18 주식회사 케이티 Method and method of call processing for improving call connection rate
KR101404559B1 (en) * 2012-07-20 2014-06-09 에스케이텔레콤 주식회사 Apparatus for processing call between heterogeneous networks and method therefor

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