KR20060016646A - Mobile communication system having a dual map handover function and controlling method therefore - Google Patents

Abstract

According to the present invention, an MM-MB terminal in a call from a WCDMA network to a CDMA network attempts to perform a handover and transmits a handover request message to the MSC of the WCDMA, and includes information that the MSC of the WCDMA network transfers from the handover request message to the CDMA network. Network information transmission step of generating network information message to ANSI41 MAP and transmitting to CDMA MSC, and after the network information transmission step, MSC of CDMA network allocates channel to MM-MB terminal through sub-structure device to perform handover procedure. After performing the handover procedure and after performing the handover procedure, the MSC of the WCDMA network converts the Mobile On Channel message received from the CDMA MSC to the ANSI41 MAP into the GSM MAP and sends the Iu-Release Command / Complete to the RNC and node-B. A mobile communication system equipped with a dual map handover function comprising a step of releasing an IU section by transmitting and receiving and releasing an Iu section, and a control method thereof. The.

In the present invention as described above, since the handover information is directly exchanged with each other without passing through a roaming gateway between the 3G MSC and the 2G MSC, the multimode multiband terminal enables the 3G to be handed over. From the system to the 2G system, handover can be easily performed continuously without going through the roaming device.

MM-MB terminal, WCDMA, CDMA, handover, handover request message, ANSI41 MAP

Description

Mobile communication system having a dual MAP handover function and controlling method therefore}

1 is an explanatory diagram for explaining a roaming state of a mobile communication system in a conventional WCDMA network and a CDMA network;

2 is an explanatory diagram showing a mobile communication system of the present invention for explaining a handover state in a WCDMA network and a CDMA network.

3 is a flowchart of the present invention.

<Detailed Description of Codes>

1: MM-MB terminal 2: 2G MSC

3: 3G MSC 4: RNC

5: WCDMA network 6: CDMA network

7: 2G base station 8: BSC

9A-B: node-B 10: Terminal

The present invention relates to a mobile communication system equipped with a dual map handover function and a control method thereof. In particular, the 3G MSC directly converts the handover information into an ANSI41 MAP method without going through the MGW between the 3G MSC and the 2G MSC. The present invention relates to a mobile communication system equipped with a dual map handover function and a control method thereof.

In general, UMTS (Universal Mobile Telecommunication System) networks can transmit "third generation", broadband packet-based text, digitized voice or video, and multimedia data at high speeds of more than 2 Mbps, whether mobile or computer users are anywhere in the world. Provide consistent service. This UMTS network allows computer and telephone users to continue to access the Internet while traveling and have the same performance no matter where they are traveling. Users will use this UMTS service through a combination of terrestrial radio and satellite transmission technology. However, recently, terminals (hereinafter referred to as MULTI-MODE MULTI-BAND) supporting WCDMA (3G) and CDMA (2G) have been developed to be usable under 3G or 2G.

In this case, the 3G or 2G mobile communication system allocates a call channel to a mobile communication terminal existing in its sector to process a call. The mobile communication terminal receives a call channel assigned during a call. Frequently, cases move away from a base station and move to another cell or another sector under its control. At this time, the adjacent base station performs a function of allocating a new channel instead of the radio frequency channel in use so that the call can be maintained.

Then, referring to FIG. 1, a conventional mobile communication system having a dual band as described above, first, an outgoing signal signal transmitted from the MM-MB terminal 70 is transmitted to the node-B 71A-B and the RNC 72. 3G MSC 74 to form a call path in a 3G manner and handle handoff with another destination terminal 73 by using trunk resources at the time of handoff, and perform the reverse process.

When the MM-MB terminal 70 is hard handed over, the 2G MSC (75) for changing the handover call signal to a signal of the 2G method and performs the reverse process, and

A roaming gateway 76 (hereinafter referred to as RGW) installed between the 3G MSC 74 and the 2G MSC 75 to interface the roaming signal between both communication networks.

Meanwhile, in the handover method of the conventional MM-MB terminal, the MM-MB terminal 70 first makes a call with another terminal 73 in a certain cell, for example, a node-B (71A) cell of a 3G system. When handing over to the node-B 71B area, call signals of these terminals 70 and 73 are processed in the node-B 71A-B, RNC 72 and 3G MSC 74 of the 3G scheme. At this time, when the terminal 70 needs to move to the cell area of the 2G system in the call processing process, the current call is disconnected and the BTS 77 of the 2G system is requested to register the location again and the call allocation is received again. That is, when the MM-MB terminal 70 enters the boundary cell out of the WCDMA service area during a call, the MM-MB terminal 70 receives a factor indicating the overlapping area of the CDMA and WCDMA areas, activates the CDMA modem, and attempts hard handoff to the CDMA area. The subscriber must then reconnect the call. Then, the BTS 77 of the 2G system reports this to the 2G MSC 75 through the BSC 78, and the terminal 70 allocates a call resource according to the control signal of the 2G MSC 75 to continue the call. do. In this case, when talking to the other terminal 73, the corresponding 2G MSC 75 transmits the call signal of the roaming terminal 70 to the RGW 76 in ANSI41 MAP method (Facilities Directive2 ACK). ). Then, the RGW 76 converts the received ANSI41 MAP type Facilities Directive2 ACK signal into a Prepare handover response message operable in the 3G system, and transmits it to the 3G MSC 74B. The 3G MSC 74B transmits the roaming call signal from the input 2G network to the 3G MSC 74A to which the terminal 73 is connected to execute a normal call with the terminal 73.

At this time, the CDMA MSC 75 transmits the Mobile On Channel to the RGW 76 and the RGW 76 converts the Mobile On Channel message into a Send-End-Signal Request message. On the other hand, the WCDMA MSC 74 receives the Send-End-Signal Request message from the RGW and recognizes that the terminal 70 has been relocated to the CDMA network. In addition, the WCDMA MSC 74 transmits and receives an IU Release Command / Complete with the WCDMA RNC 72 to release the IU interval. On the other hand, when the subscriber in the WCDMA network completes the call, the WCDMA MSC 74 transmits a Send-End-Signal Response message to the RGW 76 and converts the message into a Facilities Release message to the CDMA MSC 75. send. Then, the CDMA BSC 78 and the CDMA MSC 75 release resource allocation through a Clear Command / Complete message.

However, the handover method from the 3G network to the 2G network as described above is interworking between two nodes of the WCDMA MSC and the CDMA MSC when the MM-MB terminal in a call moves from the WCDMA area (3G network) to the CDMA area (2G). In order to do this, RGW must be used. Therefore, signaling message for interworking with RGW has occurred additionally, and it is a cause to hinder QoS. Also, when setting relay trunk trunk during the exchange, RGW must be connected to WCDMA MSC and ISUP and CDMA Since the relay call processing function to connect the MSC and the dedicated CIC channel must be provided, it causes a considerable problem in designing a mobile communication system.

Accordingly, the present invention has been invented to solve the conventional problems as described above, and since the multi-mode multiband terminal can easily handover continuously without passing through the RGW from the 3G system to the 2G system, accordingly, An object of the present invention is to provide a mobile communication system and a control method equipped with a dual map handover function, which significantly improves quality characteristics.

Another object of the present invention is to use only the dedicated CIC channel used in the CDMA MSC without a complicated call processing procedure because the call signal of the handover terminal is not disconnected even during a call, thereby improving the reliability of the call quality. A mobile communication system having a map handover function and a control method thereof are provided.

The present invention for achieving the above object and the MM-MB terminal performing a Mobile Assistant Hard Handover (Network Directed Hard Handover) or a Handover (Network Directed Hard Handover) when the handover from the WCDMA network to the CDMA network; A WCDMA MSC which performs call control for the subscriber on the network and converts a call signal into a GSM MAP or an ANSI41 MAP, and uses the WCDMA MSC and the ANSI41 MAP to perform an inter-RAT hard handover. Provided is a mobile communication system having a dual map handover function consisting of a CDMA MSC.

Another feature of the present invention is a handover attempt step of transmitting a handover attempt alarm message to an MSC of a WCDMA when a MM-MB terminal in a call from a WCDMA network to a CDMA network attempts a handover, and WCDMA after the handover attempt step. A network information transmission step of generating a network information message including information to be transmitted from a handover request message to a CDMA network in an ANSI41 MAP to a CDMA MSC, and the MSC of the CDMA network after the network information transmission step Performing a handover procedure by allocating a channel to the MM-MB terminal through the MAP, and performing the mobile on channel message received by the MSC of the WCDMA network from the CDMA MSC to the ANSI41 MAP after the handover procedure. Conversion process and IU-Release Command / Complete is transmitted and received between RNC and node-B to release IU section. Provides a control method for a dual-map handover function is provided a mobile communication system.

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

In the mobile communication system to which the present invention is applied, an MM-MB terminal (1) performing Mobile Assistant Hard Handover or Network Directed Hard Handover when handovering from WCDMA network 5 to CDMA network 6 as shown in FIG. ), And perform call control for subscribers in the network (5,6) and connect trunks using Dedicated CIC when establishing relay calls between nations, and according to the country network (WCDMA, CDMA, etc.) WCDMA MSC (3) for delivering a message using, and CDMA MSC (2) for performing Inter-RAT Hard Handover using the WCDMA MSC (3) and ANSI41 MAP.

One end of the WCDMA MSC 3 is connected to an RNC 4 that transmits a message using a WCDMA MSC and a RANAP in an Iu section as a subsystem for controlling wideband radio access, and one end of the CDMA MSC 2. The BSC 8 which controls Radio Access in the CDMA network 6 and interworks with the CDMA MSC 2 via the A-interface using BSSAP is connected.

Here, the WCDMA MSC 3 and the CDMA MSC 2 directly transmit and receive signals with ANSI41 MAP without RGW relaying.

Next, a control method applied to the present invention as described above will be described.

As shown in FIG. 3, the first embodiment of the present invention proceeds to a handover attempt step S2 in an initial state S1, whereby a busy MM-MB terminal attempts a handover from a WCDMA network to a CDMA network. In this case, the MSC of the CDMA network sends a handover request message (IU Relocation Required) to the MSC of the WCDMA.

After the handover attempt step (S2), the network information transmission step (S3) proceeds to the network information including information (Target CellID, InterMSCCircuitID, BillingID, etc.) that the MSC of the 3G network will transfer from the handover request message to the 2G network. The signal (FacilitiesDirective2) is generated as ANSI41 MAP and transmitted to the CDMA MSC.

In addition, after the network information transmission step S3, the process proceeds to the handover request step S4 and the CDMA MSC transmits a handover request to the target base station using the target cell ID of the network information signal FacilitiesDirective2 message. After the handover request step (S4), the process proceeds to the handover procedure implementation step (S5), the target base station allocates a radio resource to handover the MM-MB terminal and transmits a Handover Request Ack to the CDMA MSC. After the handover procedure transition step S5, the network information ACK transmission step S6 is performed, and the CDMA MSC transmits an Ack of the network information signal FacilitiesDirective2 to the MSC of the WCDMA network. After the network information ACK transmission step (S6), the resource allocation alarm step (S6) proceeds to 3G MSC transmits the Iu-Relocation Command message to the RNS-B and the MM-MB terminal for handover to the CDMA network Signals that a Radio Resource has been allocated.

  In addition, after the resource allocation alarm step (S7), the terminal message transmission step (S8) proceeds to the terminal receiving the Handover from UTRAN command from the WCDMA network transmits a message indicating that the handover is terminated from the WCDMA network to the CDMA network. After the terminal message transmission step (S8), the handover complete signal transmission step (S9) proceeds to the CDMA BSC transmits the BS Ack order to the terminal to control and transmits the handover complete signal of the terminal to the CDMA MSC.

On the other hand, after the handover complete signal transmission step (S9) to proceed to the handover alarm processing step (S10) and the target base station of 2G transmits the Handover Complete to the CDMA MSC to inform that the MM-MB terminal is handed over to the CDMA network. After the handover alarm processing step (S10), the process proceeds to the IU interval release step (S11). The 3G MSC receives the ANSI41 MAP type Mobile On Channel message from the CDMA MSC, converts it to GSM MAP, and performs RNC and node-. Release Iu section by sending and receiving Iu-Release Command / Complete with B. When the subscriber in the WCDMA area completes the call after the IU interval release step S11 and the subscriber completes the call, the Anchor MSC-A transmits a Facilities Release message to the CDMA MSC through the Serving MSC. CDMA base station and CDMA MSC release Radio Resource through Clear Command / Complete message.

In other words, the MM-MB terminal 1 in communication with the terminal 1 in the MSC 3 area in the WCDMA area approaches the boundary area of the WCDMA network 5 to trigger a handover to the CDMA network 6 ( When triggering, the MSC 2 of the CDMA network 6 transmits a handover request message (Iu-Relocation Required) to the MSC 3 to start the handover. In this case, the handover request message (IU Relocation Required) includes information used in a CDMA network such as a Cell Identifier List (Target). The MSC 3 of the 3G network 5 includes a network information signal (FacilitiesDirective2) including information (Target CellID, InterMSCCircuitID, BillingID, etc.) to be transmitted from the handover request message (Iu-Relocation Require) to the 2G network 6. Message is sent to the CDMA MSC (2).

In addition, after the network information transmission step, the CDMA MSC 2 transmits a handover request to the target base station 7 via the BSC 8 by using the target cell ID of the network information signal message FacilitiesDirective2.

The target base station 7 allocates a Radio Resource to handover the MM-MB terminal 1 and transmits a Handover Request Ack to the CDMA MSC 2. In addition, the CDMA MSC 2 transmits the Ack of the network information signal FacilitiesDirective2 to the MSC 3 of the 3G network 5. Then, the MSC (3) of the 3G (5) converts the ANSI41 MAP network information signal (FacilitiesDirective2) input from the MSC (2) of the CDMA into a GSM MAP, and processes the RNS (4) and the Node-B (9B). An Iu-Relocation Command message is sent to the MM-MB terminal 1 to inform that the Radio Resource for handover to the CDMA network 6 has been allocated.

Here, the MSC (3) of the 3G (5) converts the signal of ANSI41 MAP input from the MSC (2) of the CDMA to GSM MAP or vice versa, so that the MSC (2) of the 3G (5) directly with the MSC (2) of the CDMA without RGW Perform communication.

In addition, after the resource allocation alarm process, the target base station 7 of the 2G 6 transmits a handover complete to the CDMA MSC 2 to inform that the MM-MB terminal 1 has been handed over to the CDMA network 6. At this time, the MSC 3 of the 3G 5 receives a Mobile On Channel message from the CDMA MSC 2 and recognizes a handover, and then sends an Iu-Release Command / Complete to the RNS 4 and the Node-B 9B. Releases the Iu section by sending and receiving.

In this case, the MSC 3 of the WCDMA sends a Facilities Release message to the CDMA MSC 2 when the subscriber in the WCDMA area completes the call, thereby releasing the relay call, and accordingly, the CDMA base station 7 and the CDMA MSC 2 ) Releases Radio Resource through Clear Command / Complete message. Of course, when the subscriber handed over to the CDMA service area terminates the call, the message delivery direction is reversed.

 As described above, in the present invention, the 3G MSC directly converts the handover information to the ANSI41 MAP method without going through the MGW between the 3G MSC and the 2G MSC, thereby allowing the multi-mode multiband terminal to perform the RGW from 3G to 2G. Since the handover can be easily performed continuously without passing through, accordingly, the quality characteristics of the handover are considerably improved.

In addition, according to the present invention, since only the dedicated CIC channel used in the CDMA MSC is used without the call processing procedure of the handed-over terminal, the call is not disconnected even during a call, thereby significantly improving the reliability of the call quality. It also works.

Claims (5)

When handing over from a WCDMA network to a CDMA network, an MM-MB terminal which performs a Mobile Assistant Hard Handover or a Network Directed Hard Handover, and performs call control for a subscriber on the network. And a WCDMA MSC for converting a call signal to a GSM MAP or an ANSI41 MAP, and a CDMA MSC for performing an inter-RAT hard handover using the WCDMA MSC and the ANSI41 MAP. Mobile communication system equipped with a handover function. A handover attempt step of sending a handover request message to the MSC of the WCDMA when the MM-MB terminal on the CDMA network attempts to handover, and the MSC of the WCDMA network requests a handover after the handover attempt step. A network information transmission step of generating a network information message including information to be transmitted from the message to the CDMA network in ANSI41 MAP and transmitting the same to the CDMA MSC, and after the network information transmission step, the MSC of the CDMA network passes through the substructure device to the MM-MB terminal. Performing a handover procedure by allocating a channel to a handover procedure, and converting a Mobile On Channel message received by the MSC of the WCDMA network from the CDMA MSC to the ANSI41 MAP to the GSM MAP after the handover procedure. Iu interval release step of transmitting and receiving the Iu-Release Command / Complete to the node-B to release the Iu interval, characterized in that Eolmaep method of controlling a hand-over function is provided with a mobile communication system. The mobile communication system of claim 2, wherein the handover request message during the handover attempt step includes information used in a CDMA network such as a cell identifier list (Target). Control method. The mobile terminal of claim 2, wherein the network information signal (FacilitiesDirective2) prepared by the MSC of WCDMA includes information such as Target CellID, InterMSCCircuitID, BillingID, etc. during the network information transmission step. Control method of communication system. The WCDMA MSC sends a Facilities Release message to the ANSI41 MAP by the CDMA MSC when the call of the subscriber in the WCDMA area is completed after the Iu interval release step, and the CDMA base station and the CDMA MSC clear. And a channel release step of releasing the call resource through the Command / Complete message.

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