KR100612685B1 - Multi-mode Multi-band Mobile Communication Terminal and Mode Switching Method Thereof - Google Patents

Abstract

The present invention relates to a multimode-multiband mobile communication terminal and a mode switching method for smooth mode switching from a synchronous mobile communication network to an asynchronous mobile communication network. Start the corresponding modem unit, acquire a network synchronizer with the mobile communication network to switch modes through the activated modem unit, perform a location registration with the mobile communication network after obtaining the network synchronizer, and after the location registration, the mobile communication network through the activated modem unit Communication with other mobile communication networks, and by deactivating the modem unit that communicates with other mobile communication networks, it is possible to minimize the communication disconnection during mode switching by minimizing the time delay during mode switching in the boundary area between the synchronous mobile communication network and the asynchronous mobile communication network. There is.

Description

Multi-mode Multi-band Mobile Communication Terminal and Mode Switching Method Thereof}

1 is a block diagram illustrating a mobile communication network connection of a multi-mode multi-band mobile communication terminal according to the present invention;

2 is a block diagram for explaining the configuration of a multi-mode multi-band mobile communication terminal according to the present invention;

3 is a block diagram illustrating a configuration of a common module of a multi-mode multi-band mobile communication terminal according to the present invention;

4 is an explanatory diagram for explaining mode switching from an asynchronous mode to a synchronous mode of a multi-mode multi-band mobile communication terminal according to the present invention;

5 is an explanatory diagram for explaining mode switching from a synchronous mode to an asynchronous mode of a multi-mode multi-band mobile communication terminal according to the present invention;

6 is a flowchart illustrating a mode switching method from a synchronous mode to an asynchronous mode of a multi-mode multi-band mobile communication terminal according to the present invention.

<Brief description of the main parts of the drawings>

100: asynchronous mobile communication network 200: synchronous mobile communication network

400: mobile communication terminal 410: antenna

420: asynchronous wireless device 430: synchronous wireless device

440: common module 443: main processor

447: mode switching management unit

The present invention relates to a multimode-multiband mobile communication terminal and a mode switching method for smooth mode switching from a synchronous mobile communication network to an asynchronous mobile communication network.

The mobile communication service has been continuously developed starting from the low-quality voice call-oriented first generation mobile communication service provided by the analog cellular Advanced Mobile Phone Service (AMPS), which has been in service since the late 1980s. In the second generation mobile communication service, enhanced voice call and low speed (14.4 Kbps) data service provided by digital cellular Global System for Mobile (GSM), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), etc. are possible. It was. In addition, in the 2.5G mobile communication service, the PCS (Personal Communication Service), which can be used around the world in addition to securing the frequency in the GHz band, has been developed to enable improved voice call and low speed (144 Kbps) data service.

Mobile communication networks for mobile communication services up to the 2.5th generation include various types of communication such as a user terminal, a base station transmitter, a base station controller, a mobile switching center, a home location register (HLR), and a visitor location register (VLR). The equipment is installed.

The third generation mobile communication service is classified into asynchronous WCDMA system proposed by 3GPP (Generation Partnership Project) and synchronous CDMA-2000 system proposed by 3GPP2. In particular, the WCDMA system is a wireless protocol recommended by IMT-2000, and many telecommunication service providers around the world are providing or preparing to provide services.

WCDMA systems have a high call quality and use a spread spectrum method, which is suitable for transmitting a large amount of data. The WCDMA communication system adopts AMR (Adaptive Multi-Rate codec) with a transmission rate of 12.2 Kbps to 4.75 Kbps for voice coding, and supports high mobility enough to make a call even if the user moves at a speed of about 100 Km / h. . In addition, WCDMA communication is adopted by most countries, and 3GPP, which is composed of many organizations such as Korea, Europe, Japan, the United States, and China, is continuously developing technical specifications for WCDMA.

On the other hand, recently, due to the advantages of the WCDMA system described above, Korea, the United States, China, etc., which basically provide the CDMA-2000 service, which is a synchronous mobile communication network, have started to provide a WCDMA service by establishing a WCDMA network, an asynchronous mobile communication network. .

For this, a mobile communication terminal supporting both a synchronous mobile network and an asynchronous mobile communication network was required, and a multimode-multiband mobile communication terminal appeared.

Multimode includes synchronous mode and asynchronous mode, and the multiband includes second generation mobile communication service using a frequency band of 800 MHz, second generation mobile communication service using a frequency band of 800 MHz or 1.8 GHz, approximately 2 GHz A third generation mobile communication service using a frequency band and a fourth generation mobile communication service to be serviced in the future.

When the multi-mode multi-band mobile communication terminal moves from the area of the synchronous mobile communication network to the overlay area of the asynchronous mobile communication network, it is necessary to switch between the synchronous mode and the asynchronous mode.

When the multi-mode multi-band mobile communication terminal moves from the overlay area of the asynchronous and synchronous mobile communication networks to the area of the synchronous mobile communication network, it is necessary to switch between the asynchronous mode and the synchronous mode. Since the modem for accessing the synchronous mobile communication network was started after the call was disconnected from the asynchronous mobile communication network, the communication was disconnected because it took about several seconds or more when the mode was switched.

Accordingly, the present invention provides a multimode-multiband mobile communication terminal and a mode switching method capable of minimizing communication disconnection and performing mutual mode switching between an asynchronous mobile communication network and a synchronous mobile communication network. There is a purpose.

The multi-mode multi-band mobile communication terminal according to the present invention for achieving the above object is to manage the current state of the synchronous modem unit and the asynchronous modem unit, the active and inactive of each modem unit in accordance with the current communication state with the mobile communication network And a mode switching management unit for controlling the control unit, wherein the mode switching management unit starts a modem unit for communicating with the mobile communication network to be switched and acquires a network synchronizer with the corresponding mobile communication network when the mode switching is determined according to a preset criterion. And performing communication with the mobile communication network through the corresponding modem unit performing the location registration after the location registration, and controlling the modem unit communicating with other mobile communication networks to be deactivated.

In addition, the mode switching method of the multi-mode multi-band mobile communication terminal according to the present invention, in the mode switching method of the synchronous-asynchronous period of the mobile communication terminal, each having a modem unit for communication with the asynchronous mobile communication network and the synchronous mobile communication network, When the mode change is determined, step 1 of starting the corresponding modem unit for communication with the mobile communication network to be switched mode, step 2 of acquiring the network synchronizer of the mobile communication network to be switched mode via the activated modem unit, and then moving Performing a location registration to a communication network; and performing a communication with a corresponding mobile communication network through the modem unit activated in step 1 after the location registration, and deactivating a modem unit communicating with another mobile communication network. do.

Hereinafter, with reference to the accompanying drawings to describe the present invention in detail.

1 is a block diagram illustrating a mobile communication network connection of a multi-mode multi-band mobile communication terminal according to the present invention.

Referring to FIG. 1, the WCDMA network 100, which is an asynchronous mobile communication network, includes a wireless station (hereinafter referred to as a 'Node B') 101 and a node-B 101 that perform wireless communication with the mobile communication terminal 400. Serving GPRS Service Node (hereinafter referred to as 'RNC') 102, which is connected to the RNC 102 to manage mobility of the mobile communication terminal 400 Asynchronous communication network data service gateway node (hereinafter referred to as 'GGSN'), which is a relay device that performs the packet service control and packet data transmission through the GPRS network 105 and the GPRS network 105. 106).

In addition, an exchanger (hereinafter referred to as 'MSC') 104 is connected to the RNC 102 to perform a call exchange, and the MSC 104 is a number seven signal network (No. 7 signal network) for signal exchange ( 107). The number seven signal network 107 has a short message service center (hereinafter referred to as SMSC) 108 for serving a short message, and a home location register (hereinafter referred to as 'HLR') for managing location information of subscribers. 109 is connected.

Meanwhile, the CDMA2000 network 200, which is a synchronous mobile communication network, includes a base station (hereinafter referred to as BTS) 201 that performs wireless communication with the mobile communication terminal 400, and a base station controller that controls the BTS 201. Hereinafter referred to as 'BSC' 202, a Packet Data Service Node (hereinafter referred to as 'PDSN') 204 connected to the BSC 202 and serving packet data and the PDSN 204 Data Core Network (hereinafter referred to as 'DCN') 208 that is connected to the Internet and performs an Internet access service, and an exchange that is connected to the BSC 202 to perform an exchange (hereinafter referred to as 'MSC'). 203).

The MSC 203 is connected with a number seven signal network (No. 7 signal network) 205 for signal exchange. The number seven signal network 205 includes a short message service center (hereinafter referred to as 'SMSC') 206 that serves a short message, and a home location register (hereinafter referred to as 'HLR') for managing location information of subscribers. 207 is connected.

In this embodiment, the synchronous network 200 and the asynchronous network 100 have HLRs 109 and 207 for managing subscriber information and location information, respectively, but use a single dual stack home location register (HLR). By doing so, the synchronization network 200 and the asynchronous network 100 may share subscriber information and location information.

2 is a block diagram illustrating a configuration of a multi-mode multi-band mobile communication terminal according to the present invention.

Referring to FIG. 2, the multi-mode multi-band mobile communication terminal 400 according to the present invention has a protocol stack for supporting both synchronous mobile communication and asynchronous mobile communication.

The mobile communication terminal 400 according to the present invention is broadly divided into an antenna 410 for transmitting and receiving radio waves with the synchronous mobile communication network 200 and the asynchronous mobile communication network 100, and a synchronous radio device 430 for synchronous communication. , Asynchronous radio 420 for asynchronous communication, and a common module 440 for providing common resources in synchronous and asynchronous communication.

The synchronous radio device 430 includes a synchronous radio transmitter 432 for radio transmission, a synchronous radio receiver 433 for radio reception, and a synchronous modem unit 434. The synchronous radio transmitter 432 and One side of the synchronous radio receiver 433 is connected to the antenna 410 through a duplexer 431, and the other side is connected to the synchronous modem unit 434.

In addition, the asynchronous radio device 420 also includes an asynchronous radio transmitter 422 for radio transmission, an asynchronous radio receiver 423 for radio reception, and an asynchronous modem unit 424. The asynchronous radio transmitter 422 and One side of the asynchronous radio receiver 423 is connected to the antenna 410 through the duplexer 421 and the other side is connected to the asynchronous modem unit 424.

3 is a block diagram illustrating a configuration of a common module of a multi-mode multi-band mobile communication terminal according to the present invention.

Referring to FIG. 3, the common module 440 of the multi-mode multi-band mobile communication terminal according to the present invention includes the modem units 424 and 434 of the synchronous radio 430 and the asynchronous radio 420. A plurality of dual port RAMs (hereinafter referred to as DPRAMs) 441 and 442 connected to the plurality of dual port RAMs (hereinafter referred to as DPRAMs) 441 and 442 and the DPRAM 441 and 442 which control the overall control of synchronous and asynchronous communication of the mobile communication terminal 400. And a main processor 443 performing application execution. The main processor 443 includes a memory 444 for storing data, an I / O device 445 for connecting a peripheral device, and a power control module (hereinafter referred to as 'PWM') 446 for power control. Connected.

In addition, the common module 440 is provided with a mode manager (Call Manager For Roaming) (447) for minimizing call disconnection due to time delay, etc., the mode switching manager 447 is a synchronization modem unit 434 And the asynchronous modem unit 424 to perform mode switching management. Although the mode switching management unit 447 is described in a separate configuration in this embodiment, it may be included as an internal configuration of the synchronous modem unit 434 and the asynchronous modem unit 424.

The mobile communication terminal 400 having the above-described configuration may perform communication in an asynchronous mobile communication network and a synchronous mobile communication network, and asynchronous dedicated mode (WCDMA only), which performs communication only to an asynchronous mobile communication network according to a user setting, first asynchronous Asynchronous communication mode (WCDMA preferred), which performs mode switching for communication with a synchronous mobile communication network when it is out of the asynchronous mobile communication network and communicates with the synchronous mobile communication network, and moves to the asynchronous mobile communication network area. Upon entering, the communication mode may be set to one of a synchronous priority mode (CDMA preferred) and a synchronous only mode (CDMA only) for performing mode switching for communication with the asynchronous mobile communication network.

To this end, the mode switching management unit 447 of the mobile communication terminal 400 according to the present invention manages the current state of the synchronous modem unit 434 and the asynchronous modem unit 424 and according to the current communication state with the mobile communication network is located. Control the activation and deactivation of each modem unit.

4 is an explanatory diagram for explaining a mode switch from the asynchronous mode to the synchronous mode of the multi-mode multi-band mobile communication terminal according to the present invention.

When the mobile communication terminal enters the boundary area between the asynchronous mobile communication network and the synchronous mobile communication network, the mobile communication terminal determines whether the mode is switched according to a preset condition, and if the mode is necessary, the mode is switched.

The determination of whether to switch the mode may be performed according to the signal strength of each mobile communication network, to monitor the system information block (SIB) transmitted from the asynchronous communication network, or to switch the mode transmitted from the base station of the synchronous mobile communication network. It can be determined depending on whether the parameter is received.

In the embodiment shown in FIG. 4, the system information block (SIB) transmitted from the asynchronous communication network is monitored, so that it is determined to enter the boundary area from the asynchronous mobile communication network with the synchronous mobile communication network.

As shown in FIG. 4, the mobile communication terminal 400 in the area A of the asynchronous mobile communication network monitors a system information block (SIB) transmitted from the asynchronous communication network. The mobile communication terminal 400 moves to the boundary area B of the asynchronous mobile communication network and the synchronous mobile communication network, and determines whether the preset parameter value included in the system information is set to the synchronous network mode switching. If the parameter value is set to synchronous network mode switching, it is determined that mode switching is performed.

When it is a condition to perform mode switching, the mode switching management unit 447 according to the present invention activates the synchronous modem unit 434 to switch the current mode to acquire network synchronization from the synchronous mobile communication network and perform location registration. do. At this time, the asynchronous modem unit 424 continues to operate.

When the synchronous modem unit 434 normally completes the location registration, the mode switching manager 447 deactivates (off or sleeps) the asynchronous modem unit 424. Accordingly, it is possible to switch to the synchronous mode by minimizing the time delay in mode switching.

5 is an explanatory diagram for explaining a mode switching from a synchronous mode to an asynchronous mode of a multi-mode multi-band mobile communication terminal according to the present invention.

As shown in FIG. 5, the mobile communication terminal 400 in the area C of the synchronous mobile communication network searches for whether a mode switching parameter for mode switching is included in the signal transmitted from the synchronous mobile communication network. In this case, the signal may be base ID information. The mobile communication terminal 400 determines whether a mode switching parameter is set in the parameter for mode switching, for example, the base ID information while moving to the boundary area B of the synchronous mobile communication network and the asynchronous mobile communication network.

If it is determined that the mode switching parameter is set, it is determined that the current synchronous mode is switched to the asynchronous mode.

When it is a condition to perform the mode switching to the current synchronous mode asynchronous mode, the mode switching management unit 447 according to the present invention starts the asynchronous modem unit 424 to switch the current mode to perform network synchronization from the asynchronous mobile communication network. Acquire and perform location registration. At this time, the synchronous modem unit 434 continues to operate.

When the asynchronous modem unit 424 normally completes the location registration, the mode switching manager 447 deactivates (off or sleeps) the synchronous modem unit 434. Accordingly, it is possible to switch to asynchronous mode by minimizing time delay in mode switching.

Hereinafter, the process of switching from the asynchronous mode to the synchronous mode in the mode switching process will be described in detail.

6 is a flowchart illustrating a mode switching method from an asynchronous mode to a synchronous mode of a multi-mode multi-band mobile communication terminal according to the present invention.

Referring to FIG. 6, a mobile communication terminal performing communication in an asynchronous mobile communication network activates an asynchronous modem unit 424 to perform an operation in an asynchronous mode (S10). At this time, when the mode switch is determined from the asynchronous mode to the synchronous mode as described above (S20), the mode switch management unit 447 performs a mode switch request to the synchronization modem unit 434 (S30). Accordingly, the synchronization modem unit 434 starts and acquires synchronization of the synchronous mobile communication network (S40), and determines whether synchronization has been normally obtained (S50).

If it is determined in step S50 that synchronization has not been acquired, the synchronization modem unit 434 transmits a synchronization acquisition failure message to the mode switching management unit 477 (S51), and enters an off or sleep state (S52).

The mode switching manager 477 receives the synchronization acquisition failure message transmitted in step S51, and transmits an operation maintenance message for notifying the synchronization acquisition failure of the synchronous mobile communication network and notifying the asynchronous modem unit 424 to maintain the current state. (S53). Accordingly, the asynchronous modem unit 424 maintains the current state (S54) and the mobile communication terminal 400 continues to operate in the asynchronous mode.

On the other hand, if it is determined that the synchronization is obtained in step S50, the synchronization modem unit 434 requests the location registration to the synchronous mobile communication network (S61). Accordingly, the location information in the synchronous mobile communication network of the mobile communication terminal 400 is registered in the location (S62) and the HLR (207) to the HLR (207) (S63). The synchronous mobile communication network transmits the response according to the location registration to the synchronous modem unit 434 (S64).

The above-described HLR 207 exchanges information with the HLR 109 of the asynchronous mobile communication network. In the present embodiment, each mobile communication network is described as having a separate HLR. However, the HLR 207 and the asynchronous communication of the synchronous mobile communication network are described. The HLR 109 of the mobile communication network may be implemented as a dual stack home location register (D-HLR).

The synchronous modem unit 434 receives the response in step S64 and transmits a message to the mode switching manager 477 indicating the current state, that is, the location registration to the synchronous mobile communication network (S70). The synchronous modem unit 434 is activated and the mobile communication terminal 400 operates in a synchronous mode (S80).

At this time, the mode switching management unit 477 recognizes that the mode switching to the synchronous mobile communication network is performed well by receiving the location registration completion message transmitted from the synchronous modem unit 434, and deactivates the asynchronous modem unit 424 ( A message to be turned off or in a sleep state is transmitted to the asynchronous modem unit 424 (S71), and thus the asynchronous modem unit 424 is deactivated (S72), thereby completing the mode switching.

The above-described flowchart illustrated in FIG. 6 describes the switching from the asynchronous mode to the synchronous mode, but the switching from the synchronous mode to the asynchronous mode may also be performed through the above-described operation process.

The present invention described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. 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 in detail above, according to the multimode-multiband mobile communication terminal and the mode switching method according to the present invention, the mode switching time is minimized by minimizing the time delay during the mode switching in the boundary region between the synchronous mobile communication network and the asynchronous mobile communication network. There is an effect that can minimize the communication disconnection.

Claims (6)

In a mobile communication terminal comprising an asynchronous modem unit for communicating with an asynchronous mobile communication network and a synchronous modem unit for communicating with a synchronous mobile communication network, A mode switching management unit for managing the current state of the synchronous modem unit and the asynchronous modem unit and controlling the activation and deactivation of each modem unit according to a communication state with a mobile communication network currently located; When the mode switching is determined according to a preset criterion, the mode switching management unit starts a modem for communicating with the mobile communication network to be switched so that the modem acquires a network synchronizer of the mobile communication network to perform location registration. And controlling the communication unit to perform communication with the mobile communication network through the corresponding modem unit which has performed the location registration after the location registration, and to deactivate the modem unit communicating with another mobile communication network. In the mode switching method of the synchronous-asynchronous period of the mobile communication terminal, each having a modem unit for communication with the asynchronous mobile communication network and the synchronous mobile communication network, Step 1, starting the corresponding modem unit for communication with the mobile communication network to be switched mode is determined, Obtaining a network synchronizer with a mobile communication network to switch modes through the activated modem unit; Step 3 of performing location registration with the corresponding mobile communication network after acquiring the network synchronizer; And a fourth step of communicating with the mobile communication network through the modem unit activated in step 1 after the location registration, and deactivating the modem unit communicating with another mobile communication network. How to switch modes. The method of claim 2, Before step 1 above, When the mobile communication terminal enters the area of the asynchronous mobile communication network from the area of the synchronous mobile communication network, mode switching for mode switching transmitted from the base station of the synchronous mobile communication network located in the boundary area between the asynchronous mobile communication network and the synchronous mobile communication network. The mode switching method of the multi-mode multi-band mobile communication terminal, characterized in that for determining the mode switching by receiving a parameter. The method of claim 2, When the mobile communication terminal enters the area of the synchronous mobile communication network from the area of the asynchronous mobile communication network, before the step 1, the system information from the asynchronous mobile communication network is monitored, and in advance for mode switching to the monitored system information. The mode switching method of the multi-mode multi-band mobile communication terminal characterized in that if the set parameter value is set. The method of claim 2, Before the step 1, mode switching method of the multi-mode multi-band mobile communication terminal, characterized in that for determining the mode switching according to the signal strength of the asynchronous mobile communication network. The method of claim 2, And the mode switching method determines mode switching only when the current communication mode of the mobile communication terminal is an asynchronous priority mode or a synchronous priority mode.

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