KR100588620B1 - Method and System for processing data call in CDMA network - Google Patents

Abstract

Disclosed are a data call processing method and system in a CDMA mobile communication network. A data call processing method in a mobile communication network of the present invention comprises the steps of: a mobile communication exchange receiving a data call origination message from an originating terminal; Transmitting, by the mobile communication exchange, a call access attempt message to a network companion device in response to the call origination message; Transmitting, by the network interworking device, a subscriber information request message to an authentication authorization accounting (AAA) device; Receiving a subscriber information response message including subscriber information from the authentication / authorization / billing device; And transmitting, by the network interworking device, an acknowledgment message in response to the call connection attempt message to the mobile communication switch. According to the present invention, the IWF processing the data call obtains the subscriber information from the AAA, so that the wireless data service can be provided without changing the message (IAM) of the ISUP network.

Description

Method and system for processing data call in CDMA mobile communication network

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a diagram illustrating a configuration of a CDMA 95A / B network according to an embodiment of the present invention.

2 is a flowchart illustrating a method of extracting subscriber information according to an embodiment of the present invention.

3 is a diagram illustrating an example of a subscriber information response message.

4 is a flowchart illustrating a data call processing method according to an embodiment of the present invention.

5 is a flowchart illustrating a method of extracting subscriber information according to a comparative example of the present invention.

6 is a flowchart illustrating a data call processing method for a general subscriber according to a comparative example of the present invention.

7 is a flowchart illustrating a data call processing method for an intelligent network subscriber according to a comparative example of the present invention.

The present invention relates to call processing in a mobile communication network, and more particularly, to a subscriber information receiving method and a data call processing method in a code division multiple access (CDMA) 95A / B network.

In order to provide a wireless data service to a mobile communication terminal through a CDMA 95A / B network, a point-to-point protocol (PPP) negotiation between the mobile communication terminal and an interworking function (IWF), which is a network interworking device, is required. PPP negotiation is to prepare a data service such as assigning an IP (Internet Protocol) address to the mobile communication terminal. Therefore, the end device of the point-to-point protocol (PPP) negotiation of the CDMA 95A / B network may be referred to as IWF. Therefore, the IWF needs the information of the calling subscriber for PPP negotiation and data call processing with the mobile communication terminal.

On the other hand, in the case of call processing for voice calls, subscriber information is usually fetched from exchanges PCX and SSP. That is, subscriber information is obtained from an ISUP (ISDN User Part) network. In order to get the subscriber information through the exchange (PCX / SSP), the subscriber information must be included in the initial call access message (IAM).

In order to provide various wireless Internet services in recent years, the type and amount of subscriber information required to process data calls need to be increased compared to voice calls. Therefore, in order to deliver subscriber information for data call processing to the IWF, it is necessary to change the ISUP message, the call access attempt message (IAM).

However, for a new service, changing a call connection attempt message (IAM) having the same format not only for data calls but also for voice calls involves a lot of consideration and development costs.

Accordingly, an object of the present invention is to change the message (IAM) of the ISUP network by importing the subscriber information from the authentication, authorization and accounting (AAA) server of the IP network rather than the exchanger of the ISUP network in the mobile communication network. It is to provide a subscriber information extraction method, a data call processing method and system using the same to easily provide a variety of new wireless data services without having to.

Another object of the present invention is to extract a subscriber information method that can unify the call processing procedure for a wireless intelligent network data call and a general data call and to reduce the access time of the intelligent network data call, a data call processing method using the same, and To provide a system.

In order to achieve the above object, according to a preferred aspect of the present invention, a data call processing method in a mobile communication network, comprising: receiving a data call origination message from a calling terminal by a mobile communication switch; Transmitting, by the mobile communication exchange, a call access attempt message to a network companion device in response to the call origination message; Transmitting, by the network interworking device, a subscriber information request message to an authentication authorization accounting (AAA) device; Receiving a subscriber information response message including subscriber information from the authentication / authorization / billing device; And transmitting, by the network interworking device, an acknowledgment message in response to the call connection attempt message to the mobile communication switch.

Preferably, the call connection attempt message includes subscriber information received from a home location register (HLR).

Also, preferably, when information values of the same field among the subscriber information included in the call connection attempt message and the subscriber information included in the subscriber information response message are different from each other, the subscriber information included in the subscriber information response message has priority. to be.

In order to achieve the above object, according to another preferred aspect of the present invention, a data call processing method in a CDMA mobile communication network, the method comprising the steps of: storing the subscriber information in the authentication / authorization / accounting (AAA) device;

Receiving a data call connection request from an exchange, the exchange making the data call connection request in response to a data call origination of an originating terminal; Requesting subscriber information from the AAA device in response to the data call connection request; Receiving subscriber information of the calling terminal from the AAA device; And allowing a call connection of the calling terminal according to the subscriber information received from the AAA device.

Advantageously, the data call processing method further comprises receiving second subscriber information from said exchange, wherein subscriber information from said exchange is received with a data call connection request from said exchange.

In order to achieve the above object, according to another preferred aspect of the present invention, in the system for data call processing in a CDMA mobile communication network, an authentication / authorization / accounting (AAA) device for storing subscriber information ; A mobile communication exchange receiving a data call origination message from an originating terminal and generating a call connection attempt message in response to the call origination message; Receiving a call connection attempt message from the mobile communication exchange, sending a subscriber information request message to the AAA device in response to the call connection attempt message, and receiving subscriber information for the calling terminal from the AAA device; Provided is a system for data call processing in a mobile communication network comprising a network interworking device for transmitting an acknowledgment message in response to a call connection attempt message to the mobile communication exchange.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

Example>

1 is a diagram illustrating a configuration of a CDMA 95A / B network according to an embodiment of the present invention. Referring to this, CDMA 95A / B network according to an embodiment of the present invention is a base station system (BSS) 110, originating exchange 120, destination exchange 140, intelligent network exchange 150, network interworking device ( (Hereinafter referred to as IWF) 160, authentication / authorization / billing (AAA) Authentification Authorization Accounting (AAA) device 180 and billing fragmentation device packet billing server (IPAS: Internet Packet Accounting System, hereinafter IPAS) ).

The BSS 110 performs baseband signal processing, wireless signal transmission and reception, and includes a wireless base station and a device for managing a wireless base station connected to the mobile communication terminal 110 through a wireless channel.

The originating exchange (PCX) 120 receives the call origination message from the mobile communication terminal 100 and is the originating exchange. When the originating exchange 120 receives the originating call, the originating exchange 120 transmits a call connection attempt message to the terminating exchange 140 or the intelligent network exchange 150 according to the calling party information or the called party information so that the outgoing call can be connected to the called party.

The destination exchange 140 is an IWF adjacent exchange, which is connected to the IWF 160. When the wireless data call is transmitted from the mobile communication terminal 100, if the originating exchange 120 is not connected to the IWF 160, the mobile communication terminal through the destination exchange 140 which is an adjacent exchange connected to the IWF 160. 100 and IWF 160 are connected.

Intelligent network exchange (SSP: Service Switching Point) ( 150) are intelligent network service control device the information necessary for an exchange that processes the service for a call requiring intelligent network service of the calling number of the subscriber in a mobile communication network, the intelligent network service (SCP: Service Control Point (not shown) is requested and the information is received to provide the desired intelligent network service.

The connection between the exchanges 120, 140, 150 is made through the ISDN User Part (ISP) network 130, and the signal transfer between the exchanges follows the NO.7 protocol.

The destination exchange 140 and the intelligent network exchange 150 are connected to the IWF 160.

The IWF 160 is a network interworking device for interworking a mobile communication network with an IP (Internet Protocol) network 170. When the IWF 160 receives a call connection attempt message for establishing a data call from the destination exchange, the IWF 160 requests subscriber information from the AAA 180 in response to the message.

AAA 180 is a server for authenticating mobile subscribers, verifying authority, and providing a billing function. In particular, the AAA stores subscriber information necessary for data call processing, and serves to provide subscriber information in response to receiving a subscriber information request from the IWF 160. Typically, subscriber information necessary for call processing is stored in a home location register (HLR), and the exchange extracts subscriber information from the home location register when the exchange receives an outgoing call and sends it to the IWF 160. To pass. However, in one embodiment of the present invention, subscriber information is also stored in the AAA 180 separately from the home location register. And, for the data call, the subscriber information is extracted from the AAA 180 and used.

The IPAS 190 is a charging segmenter packet charging server for calculating a network data fee for a wireless data service, that is, a data call.

2 is a flowchart illustrating a method of extracting subscriber information according to an embodiment of the present invention. 2 is a procedure when the mobile communication terminal originates a data call.

Referring to this, when the mobile communication terminal (MS) in the CDMA 95A / B network sends a data call (S210), the originating exchange (origin PCX) receiving the outgoing call is a call connection attempt message (incoming PCX) IAM: Initial Address Message (S220) is transmitted (S220). At this time, if the originating call is a voice call, the originating exchange will extract the subscriber information of the originating subscriber from the HLR (not shown) and put it in the IAM message and send it to the destination exchange. For a data call, the originating exchange may extract the subscriber information of the originating subscriber from the HLR (not shown) and include it in the IAM message, and may not include the originating subscriber information of the HLR (not shown) in the IAM message.

 The destination exchange forwards the call connection attempt message (IAM) to the IWF. Here, the originating exchange is an exchange for receiving an outgoing signal from the originating terminal as described above. The destination exchange is an exchange connected to the IWF. Therefore, if the originating exchange is connected to the IWF, it is preferable to send the call connection attempt message (IAM) directly from the originating exchange to the IWF without having to deliver the IAP to the other exchange (called exchange).

The call connection attempt message (IAM) is an ISUP message of the exchange and is also used when establishing a voice call. Therefore, the amount of subscriber information that can be included in the IAC is limited. Therefore, it is inadequate to accommodate the needs of mobile communication providers providing various wireless Internet services in recent years. That is, in order to provide various wireless data services, it is necessary to increase the type and amount of subscriber information required compared to voice calls. In order to accommodate additional subscriber information, the call access attempt message (IAM) must be changed. As described above, since the amount of information that the call access attempt message (IAM) can contain is limited, the call access attempt message (IAM) can be modified. Inadequate to accommodate new subscriber information.

Thus, in one embodiment of the present invention, instead of changing the call connection attempt message (IAM), as shown in FIG. 2, an initial call setup response message (ACM) that is an acknowledgment for the IWF after receiving the IAM message. Before sending the message to the destination exchange, a procedure for requesting subscriber information to the AAA is inserted. Specifically, the IWF transmits a subscriber information request message (SubsInfo Request) to the AAA in response to the call connection attempt message (IAM) (S240). Then, the AAA transmits a subscriber information response message (SubsInfo Response) to the IWF in response to the subscriber information request message of the IWF (S250). The IWF and the AAA are connected through an IP (Internet Protocol) network (170 in FIG. 1).

Accordingly, the subscriber information request message (SubsInfo Request) and the subscriber information response message (SubsInfo Response) transmitted by the IWF to the AAA are messages coming from an IP network having a large bandwidth. Therefore, the subscriber information response message can easily accommodate new subscriber information derived from additional wireless Internet service, and can also convey detailed subscriber information to the IWF by including various information fields. Detailed subscriber information can be managed in the IWF.

If the information value of the same field among the subscriber information included in the call connection attempt message (IAM) and the subscriber information included in the subscriber information response message (SubsInfo Response) is different from each other, it is included in the subscriber information response message (SubsInfo Response). Subscriber information has priority.

An example of a subscriber information response message is shown in FIG. 3.

Referring to this, the subscriber response message includes a plurality of information fields. Information fields are classified into required information fields that must be included in the subscriber response message and optional information fields included as necessary. The required information field is called an M (Mandatory) type field, and the optional information field is called an O (Optional) type.

Required information fields include code, identifier, length field, and the like. Code is a field to indicate the type of message. The identifier is a field for distinguishing a pair of a request message and a response message thereto. For example, when the device sending the request message transmits the request message by setting the identifier to a predetermined value, the device returning the response message responding thereto transmits by setting the identifier to the same value. Then, the device that sent the request message can check the identifier of the received response message to find out the response message to the request message.

Among the fields indicating the subscriber information, the intelligent network service type (WSType), the calling subscriber type (calling subscriber type), and the terminal type (terminal capability) fields are also M-type fields. The intelligent network service type (WSType) field is a field for distinguishing which intelligent network service should be provided to the calling terminal when the calling terminal is a terminal of an intelligent network subscriber (eg, a prepaid subscriber). Therefore, the intelligent network service type (WSType) field has a predetermined value according to the type of the intelligent network service. When the originating terminal is a terminal of a general subscriber, the intelligent network service type field preferably has a predetermined fixed value.

The subscriber type field is a field for distinguishing attributes of an originating subscriber, for example, a field for distinguishing whether an originating subscriber is a general subscriber or an international roaming subscriber. The terminal type field is a field for identifying attributes of a subscriber station. For example, the terminal type field is used to distinguish whether a subscriber station is an IS-95A terminal, an IS-95B terminal, a CDMA2000 1x terminal, or the like.

The Win Call ID (Intelligent Network Assignment Call Identifier), IN Packet Period, and IN Time Period fields are O type fields. These fields are fields necessary for providing an intelligent network service, and are fields that are not necessary when the calling subscriber is not an intelligent network subscriber.

Win Call ID (Intelligent Network Assigned Call Identifier) is a call identifier assigned by the intelligent network for an outgoing call. IN Packet Period and IN Time Period are fields for indicating the packet unit and time unit billing period for a wireless data call. You can use only.

Referring back to FIG. 3, upon receiving the subscriber information response message from the AAA, the IWF transmits an acknowledgment message (ACM) to the destination exchange (S260). The destination exchange transfers an acknowledgment message (ACM) to the originating exchange (S270). The destination exchange receiving the acknowledgment message (ACM) assigns a traffic channel to the mobile communication terminal so that a PPP setup step (S280) between the mobile communication terminal and the IWF is performed.

The PPP setup step (S280) includes a PPP negotiation procedure such as assigning an IP address to the mobile communication terminal before the mobile communication terminal receives the full wireless Internet service.

4 is a flowchart illustrating a data call processing method according to an embodiment of the present invention. Data call processing method according to an embodiment of the present invention uses the subscriber information extraction method according to the embodiment of the present invention described above.

Referring to FIG. 4, steps from S210 to PPP setup step S280 by the mobile communication terminal are the same as those shown in FIG. 2. In FIG. 4, for convenience of description, only the exchange is shown without distinguishing between the originating exchange and the destination exchange.

If the PPP setup is made between the mobile communication terminal and the IWF (S280), the IWF transmits an accounting request to the packet billing server billing segmentation apparatus (IPAS) for billing for the data call (S290). Accounting Request (Accounting Request) is a field indicating the start of the billing operation (start), terminal identification number (MIN: mobile identification number), terminal IP address (IP), IWF IP address (IWF IP), intelligent network service type (WSType) and the like.

The IPAS starts charging in response to the charging request message (Accounting Request) and transmits a charging response message (Accounting Response) to the IWF (S300). After receiving the accounting response message (Accounting Response), the IWF transfers the response message (ANM) to the exchange (S310). Meanwhile, since the PPP setup is made between the terminal and the IWF, user data may be transferred between the terminal and the IWF (S320).

After the user data transmission is completed, if the terminal terminates the call to the exchange (S330), the exchange requests the call release to the IWF (S340). In response to the call release request, the IWF transmits a call release response message to the exchange (S350), and also sends an accounting request to the IPAS (S360). The billing request message is sent to the field to stop charging, terminal identification number (MIN), terminal IP address (IP), IP address of IWF (IWF IP), intelligent network service type (WSType), and wireless data usage. Contains information about The IPAS terminates the charging operation in response to the charging request message and transmits an accounting response message to the IWF (S370).

According to the above-described embodiment of the present invention, the IWF processing the data call obtains the subscriber information (SubsInfo Request / Response) from the AAA, thereby providing a wireless data service without changing the message (IAM) of the ISUP network. have. Such effects of the present invention will be further clarified by comparison with one comparative example of the present invention described below.

Comparative Example>

5 is a flowchart illustrating a method of extracting subscriber information according to a comparative example of the present invention.

Referring to this, when the mobile communication terminal transmits a data call (S510), the originating exchange receiving the originating signal transmits a call connection attempt message (IAM) to the destination exchange (S520). Here, the destination exchange may be a general exchange (PCX) or may be an intelligent network exchange (SSP). The destination exchange transfers the call connection attempt message (IAM) to the IWF (S530). The call connection attempt message (IAM) is an ISUP message of the exchange and includes subscriber information. At this time, the subscriber information is extracted from the originating subscriber's home location register (HLR) (not shown) and included in the call connection attempt message (IAM). In response to the IAC, the IWF forwards the acknowledgment message (ACM) to the destination exchange (S540), and the destination exchange again transfers the acknowledgment message (ACM) to the originating exchange (S550). Then, a PPP setup step S560 is performed between the terminal MS and the IWF.

However, due to the characteristics of the low bandwidth ISUP network, the amount of subscriber information that can be included in an IAM, which is used for both voice and data calls, is limited. Therefore, it is inappropriate to accommodate the needs of mobile communication providers that provide various wireless Internet services in recent years. In addition, call processing procedures for intelligent network subscribers and general subscribers will be different. This is described in detail below.

6 is a flowchart illustrating a data call processing method for a general subscriber according to a comparative example of the present invention. Data call processing method for a general subscriber according to an embodiment of the present invention uses a subscriber information extraction method according to a comparative example of the present invention shown in FIG. A general subscriber is a general mobile communication subscriber except for an intelligent network subscriber.

Referring to FIG. 6, steps (S510) to PPP setup step (S560) in which a general subscriber transmits a data call from a mobile communication terminal are the same as those shown in FIG. 5. Next steps S570 to S680 after the PPP setup S560 is made are the same as the steps S290 to S370 shown in FIG. 4. Therefore, detailed description is omitted here.

7 is a flowchart illustrating a data call processing method for an intelligent network subscriber according to a comparative example of the present invention. A data call processing method for an intelligent network subscriber according to an embodiment of the present invention uses a subscriber information extraction method according to a comparative example of the present invention shown in FIG.

Referring to FIG. 7, when the intelligent network subscriber sends a data call from the mobile communication terminal (S710), the originating exchange receiving the outgoing call determines whether the originating subscriber is an intelligent network subscriber, and if the intelligent network subscriber is an intelligent network subscriber, the intelligent network switch (SSP). A call connection attempt message (IAM) is transmitted (S720). The intelligent network exchanger transmits a message ANAINFO requesting subscriber information to the intelligent network service control apparatus (SCP) (S730). Then, the intelligent network service control apparatus (SCP) transmits a response message (Anainfo) including the subscriber information to the intelligent network switch (SSP) (S740). Then, the intelligent network switch (SSP) carries subscriber information from the intelligent network service control device (SCP) in a call access attempt message (IAM) to the IWF (S750). Upon receiving the call connection attempt message (IAM), the IWF transmits an acknowledgment message (ACM) to the intelligent network switch (SSP) (S760). The intelligent network switch (SSP) forwards an acknowledgment message (ACM) to the originating exchange (S770), and the originating exchange that receives the acknowledgment message (ACM) assigns a traffic channel to the mobile terminal to set up PPP between the mobile terminal and the IWF. (S560) is made.

Next steps S570 to S680 after the PPP setup S560 is made are the same as the steps S570 to S680 shown in FIG. 6. Therefore, detailed description is omitted here to avoid duplication of description.

As described above in the comparative example of the present invention, when the call access attempt message (IAM) is used to extract the information of the calling subscriber and deliver the subscriber information to the IWF, whether the calling subscriber is a general subscriber or an intelligent network subscriber. According to this, data call processing procedures are dualized. That is, in the scheme according to the comparative example of the present invention, when the IWF neighbor exchange originates, the intelligent network data call is connected to the IWF via the SSP, whereas according to the embodiment of the present invention, the intelligent network data call is also directly linked to the IWF from the IWF neighbor exchange. Therefore, the access time is improved for the subscribers of the intelligent network. In addition, circuit cost can be reduced because the E1 link between the intelligent network exchange and the originating exchange can be recovered and used for other purposes.

In addition, as described above, according to the method of the comparative example of the present invention, the amount of information that the call connection attempt message transmitted from the exchange to the IWF may be limited. However, according to an embodiment of the present invention, by using the IP subscriber information request message between the IWF and the AAA, subscriber information added due to various wireless Internet services can be more easily accommodated.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, according to the present invention, the IWF processing the data call obtains the subscriber information from the AAA, thereby providing the wireless data service without changing the message (IAM) of the ISUP network. In addition, according to the present invention, call processing procedures for intelligent network data calls and general data calls can be unified, and connection time of intelligent network data calls can be shortened.

Claims (11)

In the data call processing method in a mobile communication network, The mobile communication exchange receiving a data call origination message from the originating terminal; Transmitting, by the mobile communication exchange, a call access attempt message to a network companion device in response to the call origination message; Transmitting, by the network interworking device, a subscriber information request message to an authentication authorization accounting (AAA) device; Receiving a subscriber information response message including subscriber information from the authentication / authorization / billing device; And Transmitting, by the network interworking device, an acknowledgment message in response to the call connection attempt message to the mobile communication switch. Data call processing method in a mobile communication network comprising a. The method of claim 1, If the information on the same field among the subscriber information included in the call access attempt message and the subscriber information included in the subscriber information response message is different from each other, the subscriber information included in the subscriber information response message has priority. Data call processing method in mobile communication network. The method of claim 1, wherein the subscriber information response message A data call processing method in a mobile communication network comprising an intelligent network service type field, a subscriber type field and a terminal type field. The method of claim 3, If the originating terminal is a terminal of an intelligent network subscriber, the subscriber information response message further includes a packet payment period or a time unit payment settlement period field and an intelligent network allocation call identifier. Way. The method of claim 3, If the originating terminal is a terminal of a general subscriber, the intelligent network service type field has a predetermined value. A data call processing method in a CDMA mobile communication network, Storing subscriber information in an Authentification Authorization Accounting (AAA) device; Receiving a data call connection request from an exchange, the exchange making the data call connection request in response to a data call origination of an originating terminal; Requesting subscriber information from the AAA device in response to the data call connection request; Receiving subscriber information of the calling terminal from the AAA device; And Allowing call access of the calling terminal according to the subscriber information received from the AAA device; Data call processing method in a CDMA mobile communication network comprising a. The method of claim 6, The data call processing method further includes receiving second subscriber information from the exchange, Subscriber information from the switch is received with the data call connection request from the switch. The method of claim 7, wherein If the information on the same field among the subscriber information from the switch and the subscriber information received from the AAA device is different from each other, the subscriber information received from the AAA device has priority. Way. A program of instructions that can be executed by a digital processing apparatus is tangibly implemented to perform data call processing in a mobile communication network, and in a recording medium that can be read by a digital processing apparatus, Receiving a data call origination message from an originating terminal; Transmitting a call access attempt message to a network companion device in response to the call origination message; And Receiving an acknowledgment message in response to the call connection attempt message from the network companion device; The network interworking device receives the call connection attempt message and transmits a subscriber information request message to an Authentication Authorization Accounting (AAA) device and includes subscriber information from the authentication / authorization / billing device. A recording medium, characterized in that for receiving a response message. A system for data call processing in a CDMA mobile communication network, An authentication / authorization accounting (AAA) device for storing subscriber information; A mobile communication exchange receiving a data call origination message from an originating terminal and generating a call connection attempt message in response to the call origination message; And Receiving a call connection attempt message from the mobile communication exchange, transmitting a subscriber information request message to the AAA device in response to the call connection attempt message, and receiving subscriber information for the calling terminal from the AAA device; A network interworking device that transmits an acknowledgment message in response to an access attempt message to the mobile communication switch. System for data call processing in a mobile communication network comprising a. The method of claim 10, wherein the calling terminal is A system for data call processing in a mobile communication network, characterized in that the terminal of the general subscriber or the terminal of the intelligent network subscriber.

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