KR20070021339A - Service redirection message processing method for dual mode mobile communication network - Google Patents

Abstract

The present invention provides a method for processing a call transfer message in a dual mode mobile communication network in a dual mode mobile communication network of a CDMA2000-1X system and a WCDMA system, so that call processing can be switched to a CDMA2000-1X system when a failure occurs in a WCDMA domain. to provide. To this end, the present invention provides a call processing method in a dual mode mobile communication network having dual generations of first and second mobile communication systems of multiple generations for voice / video communication and packet data communication, wherein the first mobile communication is performed at a user terminal. Performing a call processing request for voice / video communication or packet data communication through the system; and when a call processing request is received in a state in which a problem occurs in the core network of the first mobile communication system, a second request is made to the user terminal. Providing a message for requesting a call processing switch to a mobile communication system; and upon receiving a message for requesting a call processing switch from a user terminal, changing to a service mode for call processing switching to the second mobile communication system; Characterized in that consisting of steps to perform.

WCDMA, CDMA2000-1X, Core Network (CN), Radio Network Controller (RNC), Service Switching

Description

SERVICE REDIRECTION MESSAGE PROCESSING METHOD FOR DUAL MODE MOBILE COMMUNICATION NETWORK}

1 is a diagram illustrating a configuration of a dual mode mobile communication network system to which a call switching message processing method of the present invention is applied;

2 is a flowchart illustrating an operation of a method for processing a call transfer message in a dual mode mobile communication network according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: UE, 12: Node B,

14: radio network controller (RNC), 16, 24: mobile communication switch (MSC),

18, 26: home location register (HLR), 20: mobile communication base station (BTS),

22: Base station controller (BSC).

The present invention relates to a call switching message processing method in a dual mode mobile communication network, and more particularly, in a dual mode mobile communication network of CDMA 2000-1X (2.5G) and WCDMA (3G), a domain in a WCDMA network. The present invention relates to a call transfer message processing method in a dual mode mobile communication network that enables call processing to be switched to a CDMA200-1X network according to a failure.

As is well known, the recent mobile communication systems are from 2G (second generation) mobile communication systems with digital cellular and personal communication system (PCS) service to 2.5G CDMA 2000 mobile communication systems employing CDMA synchronization. It is a trend that has evolved.

The 2G mobile communication system has a problem that a shortage of frequency and expensive usage fees are imposed, and in the case of a 2.5G mobile communication system, the frequency of the GHz band is secured to enable efficient use of the frequency and a low usage fee. However, there is a problem in that international roaming and full connection with the intelligent network are difficult.

In order to solve this problem, a CDMA 2000-1X mobile communication network system capable of implementing multimedia services with international full roaming and broadband frequency bandwidth has been developed and applied.

On the other hand, the actual mobile communication network system is a CDMA 2000-1X system and 2G mobile communication systems are used independently, and in the case of the 2G mobile communication system is operated with coverage of the national network, CDMA The 2000-1X system currently operates in major cities.

In addition, the International Mobile Telecommunications (IMT) -2000 system, which is applied as a third generation mobile communication system, is a mobile communication system making recommendations in the TG / 1 of the ITU-R. PSTN / ISDN / B- A mobile communication system is used to access various communication services supported by fixed communication networks such as ISDN using a wireless link.

In the 3rd generation mobile communication network system, the frequency bands used are 1,885 MHz to 2,025 MHz and 2,110 MHz to 2,200 MHz, which are determined by WARC-92, and not only provide existing communication services but also provide a higher level of service by improved technology. have.

In addition, third generation mobile communication network systems such as IMT-2000 can interoperate with various systems, have high service compatibility by worldwide operations, and can use small size, light weight terminals with high quality. .

Meanwhile, the third generation mobile communication network system adopts a wideband CDMA (WCDMA) system as an asynchronous communication method. The WCDMA system has been developed based on the GSM communication network, and the multipath fading channel is widened by widening the frequency bandwidth to 5 MHz per 1FA. Since it can be received and separated or synthesized into more multipath components, it is possible to expect an improvement in reception quality due to diversity of the rake time, so that it is suitable for high-speed data transmission.

In recent years, 2.5G CDMA2000-1X system and 3G WCDMA system have been provided in dual networks. Most WCDMA subscribers are using a mobile communication system combining CS (Core Service Domain) and PS (Packet Service Domain). It is subscribed to the service so that voice, video and packet data services can be provided simultaneously.

However, in a mobile communication system in which such a CDMA2000-1X system and a third generation WCDMA system are provided in a dual network, when a failure occurs in a specific domain of the WCDMA system, it is located in the VLR (Visitor Location Register) of the WCDMA side. If a registered subscriber attempts to receive a voice, video call, or packet service, there is a problem that normal call processing cannot be performed.

Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide call processing to a CDMA2000-1X system when a failure occurs in a WCDMA domain in a dual mode mobile communication network of a CDMA2000-1X system and a WCDMA system. A call transfer message processing method in a dual mode mobile communication network capable of switching is provided.

In order to achieve the above object, according to the present invention, in a call processing method in a dual mode mobile communication network having a dual network of a plurality of first and second mobile communication systems for voice / video communication and packet data communication, Performing a call processing request for voice / video communication or packet data communication through a first mobile communication system in a user terminal; and in a state in which a problem occurs in a core network of the first mobile communication system, Providing a message requesting the user terminal to switch the call processing to the second mobile communication system if received; and receiving a message requesting the call processing switch from the user terminal to the call processing switching to the second mobile communication system Dual mode mobile communication network comprising the step of performing a change process to the service mode for the It provides the transfer message processing method of the document.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

That is, FIG. 1 is a diagram illustrating a configuration of a dual mode mobile communication network system to which the call transfer message processing method of the present invention is applied.

As shown in FIG. 1, the dual mode mobile communication network system according to the present invention includes a user equipment (UE) 10, a 2.5 generation CDMA2000-1X system, and a third generation WCDMA system. The WCDMA system includes a Node B (12), a Radio Network Controller (RNC) 14, a mobile communication switch 16, and a Home Location Register (HLR) 18. The CDMA2000-1X system includes a mobile communication base station 20, a base station controller 22, a mobile communication switch 24, and a home location register 26.

The user terminal 10 has a WCDMA mode and a CDMA2000-1X mode in which the WCDMA system and the CDMA2000-1X system can be used in common, and the core network (CN) of the WCDMA system during call processing in the WCDMA system. If a service redirection message (SRM) is received when a failure occurs, the mode is switched from WCDMA mode to CDMA2000-1X mode to allow call processing through the CDMA2000-1X system.

The radio network controller 14 is a complex network configuration of a radio access network (RAN) and a node B 12 that provide connection and coordination functions to a base station of a WCDMA system. It performs management functions of base stations and wireless control stations such as wired / wireless channel management, terminal protocol matching, base station protocol matching and control processing, and soft handoff processing.

Here, when the wireless network controller 14 receives a service switch message (SRM) from the mobile communication switch 16 while a problem occurs in the core network (CN) of the corresponding WCDMA system, the service switch message (SRM). Is provided to the user terminal 10.

On the other hand, although the service switching message (SRM) is to be generated in the mobile communication switch 16, it is also possible to be generated directly in the radio network controller (14).

The mobile communication switch 16 performs the outgoing call processing function of the user terminal 10 and the location registration procedure and hand of the terminal through the visitor location register (VLR) or the home location register 18. Off procedure will be performed.

When the mobile communication switch 16 performs call processing from the user terminal 10 in a state where a problem occurs in the core network CN of the corresponding WCDMA system, the mobile communication switch 16 transmits a service change message to the wireless network controller 14. SRM) to allow the user terminal 10 to switch the service mode for wireless communication from the WCDMA mode to the CDMA2000-1X mode.

The home location register (18) stores subscriber information and location information for all terminal subscribers registered in the WCDMA wireless telecommunication network service. The home location register (18) is connected to the mobile communication switch (16) and interacts with a visitor location register (VLR). By the terminal subscriber location registration and subscriber tracking function is performed.

Meanwhile, the mobile communication base station 20 is a network termination device that is directly connected to a subscriber terminal by performing baseband signal processing, wired / wireless conversion, and transmission / reception of a radio signal, which is a user terminal by processing RF radio signals. Transmit / receive voice / image or packet data signal for (10).

The base station controller 22 is located between the mobile communication base station 20 and the mobile communication exchanger 24 to manage and control the mobile communication base station 20, which is a radio for the user terminal 10. A channel allocation and release function, a transmission output control function of a terminal and a base station, a handoff decision between cells, and an operation and maintenance function of the mobile communication base station 20 are performed.

The mobile communication switch 24 performs a call / outgoing call processing function of the subscriber of the mobile communication terminal and performs a location registration procedure and a handoff procedure of the terminal through the visitor location register or the home location register 26.

The home location register 26 stores subscriber information and location information of all terminal subscribers registered in the CDMA2000-1X mobile communication service, and interacts with the visitor location register by connecting to the mobile communication switch 24. By the terminal subscriber location registration and subscriber tracking function is performed.

Next, the operation of the present invention made as described above will be described in detail with reference to the flowchart of FIG. 2.

First, when the user terminal 10 performs a connection request for voice / video call or packet data communication through RRC (Radio resource Control) (step S10), the wireless network controller 14 receives a Node B Application Part (NBAP). The radio link setup request is performed to the node B 12 via the radio link setup request (step S11), and the node B 12 proceeds with the radio link setup response to the radio network controller 14 (step S11). S12).

In this state, the radio network controller 14 proceeds with setting stop for RRC connection to the user terminal 10 (step S13), and the user terminal 10 completes the RRC connection setting procedure (step S13). Step S14).

The user terminal 10 performs a configuration management (CM) service request when performing voice / video call processing as mobility management, or performs a service request when performing packet data call processing ( In step S15, the radio network controller 14 transmits a message of a CM service request for voice / video call processing or a service request for packet data call processing to the mobile communication switch 16 (step S16).

On the other hand, the mobile communication switch 16, if a problem occurs in the core network (CN) of the WCDMA system is difficult to normal call processing, the service switching message to notify the occurrence of the problem of the core network, and request to switch the call processing (SRM) is transmitted to the radio network controller 16 (step S17), and the radio network controller 14 transmits the service switch message (SRM) to the node B 12 (step S18). .

Accordingly, the Node B 12 transmits a service switch message (SRM) to the user terminal 10 (step S19), and when the user terminal 10 receives the service switch message (SRM), WCDMA Recognizing a problem state in the system, the service mode is switched from WCDMA mode to CDMA200-1X mode so that voice / video call processing or packet data call processing can be performed in the CDMA2000-1X system (step S20).

On the other hand, the present invention is not limited to the above-described typical preferred embodiments, but can be carried out in various ways without departing from the gist of the present invention, various modifications, alterations, substitutions or additions are common in the art Those who have knowledge will easily understand. If the implementation by such improvement, change, replacement or addition falls within the scope of the appended claims, the technical idea should also be regarded as belonging to the present invention.

As described above, according to the present invention, in a dual network in which a CDMA2000-1X system and a WCDMA system coexist, voice / video call processing from a user terminal subscribed to a WCDMA service in a state where a problem occurs in a core network of a WCDMA system or When there is a call diagram for packet data call processing, a WCDMA service subscriber can be provided by providing a message for the user terminal to switch the call processing to the CDMA2000-1X system so that call processing can be performed through the CDMA2000-1X service. In this case, the service restriction due to the failure of a specific domain of the WCDMA system can be minimized.

Claims (4)

A call processing method in a dual mode mobile communication network comprising a dual network of a plurality of first and second mobile communication systems for voice / video communication and packet data communication, Performing a call processing request for voice / image communication or packet data communication through a first mobile communication system in a user terminal; Providing a message requesting the user terminal to switch the call processing to the second mobile communication system when a call processing request is received in a state where a problem occurs in the core network of the first mobile communication system; When the user terminal receives a message requesting to switch the call processing, the call switching in the dual-mode mobile communication network comprising the step of performing a change process to the service mode for switching the call processing to the second mobile communication system How messages are handled. The method of claim 1, And wherein said first mobile communication system is a WCDMA system and said second mobile communication system is a CDMA2000-1X system. The method of claim 2, The call request switching request message is a service redirection message (SRM), characterized in that the call forwarding message processing method in a dual mode mobile communication network. The method of claim 3, wherein The service switching message is a call switching message processing method for a dual mode mobile communication network, characterized in that generated in any one of a mobile communication switch (MSC / VLR) or a radio network controller (RNC) of the WCDMA system.

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