KR101052687B1 - Mode switching method of multi-mode multi-band mobile communication terminal - Google Patents

Abstract

The present invention relates to a mode switching method of a multimode-multiband mobile communication terminal capable of performing mode switching between an asynchronous mobile communication network and a synchronous mobile communication network by minimizing communication disconnection. In the first step of measuring, and in the second step of determining whether the measured power of the received signal is less than or equal to the preset reference value. Step 3 for determining the state, and step 4 for starting the synchronous modem unit if it is determined to be maintained for the preset reference time in step 3, step 5 for determining whether the call of the asynchronous mode is terminated, and the call of the asynchronous mode is not terminated. If it is determined, step 6 determines whether the asynchronous radio link is released, and in step 6, the asynchronous radio link is If it is determined that the mobile station is switched to the synchronous mode and performs a call with the synchronous mobile communication network through the synchronous modem unit, the communication disconnection is minimized when the area is moved from the asynchronous mobile communication network to the synchronous mobile communication network. There is an effect that can perform mode switching with.

Description

Mode switching method of multi-mode multi-band mobile communication terminal

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 a concept of a mode switching method of a multi-mode multi-band mobile communication terminal according to the present invention;

5 is a graph illustrating mode switching according to signal strength of a multi-mode multi-band mobile communication terminal according to the present invention;

6 is a flowchart illustrating a mode switching method in an idle state of a multi-mode multi-band mobile communication terminal according to the present invention;

7 is a flowchart illustrating a mode switching method in a traffic state 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

The present invention relates to a mode switching method of a multi-mode multi-band terminal supporting both an asynchronous mobile communication network and a synchronous 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 12.2Kbps to 4.75Kbps 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 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 the connection to 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 20 seconds or more during the mode switching.

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

Mode switching method of a multi-mode multi-band mobile communication terminal according to the present invention for achieving the above object, a mobile including an asynchronous modem for communication with an asynchronous mobile communication network and a synchronous modem for communication with a synchronous mobile communication network; A method of switching between asynchronous and simultaneous modes of a communication terminal, comprising the steps of: measuring power of a received signal from the asynchronous mobile communication network; determining whether power of the measured received signal is less than or equal to a preset reference value; In step 2, if it is determined that the power of the received signal is less than or equal to a preset reference value, step 3 determines whether the state is maintained for a preset reference time. Four steps of starting, and after starting the synchronous modem unit, the synchronous mode is switched to the synchronous mode idle state. The arrival is characterized by including five steps.

In addition, the mode switching method of the multi-mode multi-band mobile communication terminal according to the present invention, the asynchronous-time period of the mobile communication terminal comprising an asynchronous modem unit for communication with the asynchronous mobile communication network and the synchronous mobile communication network In the mode switching method of the method, the first step of measuring the power of the received signal from the asynchronous mobile communication network, the second step of determining whether the power of the measured received signal is less than a predetermined reference value, and the received signal in the second step Determining that the state is maintained for a preset reference time when the power is determined to be less than or equal to a preset reference value, and starting the synchronous modem unit when determining that the state is maintained for the preset reference time in step 3; Step 5 for determining whether or not the asynchronous mode call is terminated, and the asynchronous mode call is not terminated. If it is determined that the asynchronous radio link is released in step 6, and if it is determined that the asynchronous radio link is released in step 6 to switch to the synchronous mode and the call to the synchronous mobile communication network through the synchronous modem unit It is characterized by including.

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 101 that performs wireless communication with the mobile communication terminal 400 and a wireless station controller that controls the wireless station 101 (hereinafter, referred to as 'RNC'). 102, a Serving GPRS Service Node (hereinafter referred to as "SGSN") 103 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') 106 which is a relay device for performing the packet service control and packet data transmission through the GPRS network 105 is included.

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.

The multi-mode multi-band mobile communication terminal 400 according to the present invention having the above configuration measures the signal strength of the asynchronous mobile communication network 100 to switch between the asynchronous mode and the synchronous mode.

The signal strength of the asynchronous mobile communication network is the ratio of the signal strength of the pilot channel to the magnitude of all received noise represented by energy of carrier / interference of other (Ec / Io) and the received power represented by RSSI (Received Signal Strength Indicator). Measurement can be performed using Rx Power and received signal code power represented by RSCP (Received Signal Code Power).

At this time, Ec / Io has a disadvantage of being excessively changed according to the surrounding wireless environment. On the contrary, RSSI is a reception power of a mobile communication terminal, and RSCP has a characteristic that a threshold value is almost constant since the mobile communication terminal has decoded after receiving a signal.

Accordingly, in the present invention, RSSI or RSCP is used in the signal strength measurement without using Ec / Io, and in the following embodiment, a method of using RSCP will be described. Can be.

4 is an explanatory diagram illustrating a concept of a mode switching method of a multi-mode multi-band mobile communication terminal according to the present invention. 5 is a graph illustrating mode switching according to signal strength of a multi-mode multi-band mobile communication terminal according to the present invention. The signal strength at this time will be described based on RSCP as described above.

As shown in FIG. 4 and FIG. 5, when the mobile communication terminal 400 in the area A of the asynchronous mobile communication network moves to the boundary area B of the asynchronous mobile communication network and the synchronous mobile communication network, the mobile communication is performed. The signal strength of the asynchronous mobile communication network radio station 101 received by the terminal 400 is weakened. At this time, when the signal strength is less than the predetermined reference value (TH), the mobile communication terminal 400 detects that the current position is out of the area of the asynchronous mobile communication network, and the state is continuously maintained for a predetermined time (ΔT). Judge.

If this state is continuously maintained for the predetermined time ΔT, the mobile communication terminal 400 prepares for switching to the synchronous mobile communication network by activating the synchronous modem unit for synchronous mobile communication.

In this case, when the radio station signal of the asynchronous mobile communication network is released while the synchronous modem unit is activated, the mobile communication terminal 400 enters the area C of the synchronous mobile communication network because the mobile communication terminal 400 enters the area C of the synchronous mobile communication network. 400 immediately connects to the synchronous mobile communication network through the synchronous modem unit to perform the switching.

6 is a flowchart illustrating a mode switching method in an idle state of a multi-mode multi-band mobile communication terminal according to the present invention.

Referring to FIG. 6, when the mobile communication terminal 400 is in an idle state in an area of the asynchronous mobile communication network 100 (S10), the main processor 443 determines whether the RSCP value is less than or equal to a preset reference value TH. (S20).

If it is determined in step S20 that the RSCP value is less than or equal to the preset reference value TH, the main processor determines whether a state in which the RSCP value is less than or equal to the preset reference value TH is maintained for a preset reference time ΔT (S30).

If it is determined in step S30 that the state at which the RSCP value is equal to or less than the preset reference value TH is maintained for the preset reference time ΔT, the main processor 443 may synchronize the synchronization modem unit 434 with the synchronous mobile communication network 200. ) Is activated (S40). The main processor 443 converts the current communication mode to the synchronous mode (S50), and enters the synchronous mode idle state (S60).

7 is a flowchart illustrating a mode switching method in a traffic state of a multi-mode multi-band mobile communication terminal according to the present invention.

Referring to FIG. 7, when the mobile communication terminal 400 is in a traffic state in an area of the asynchronous mobile communication network 100 (S110), the main processor 443 determines whether the RSCP value is less than or equal to a preset reference value TH. (S120).

If it is determined in step S120 that the RSCP value is less than or equal to the preset reference value TH, the main processor determines whether a state in which the RSCP value is less than or equal to the preset reference value TH is maintained for a preset reference time ΔT (S130).

If it is determined in step S130 that the state at which the RSCP value is equal to or less than the preset reference value TH is maintained for the preset reference time DELTA T, the main processor 443 determines the BLock (BLock Error Rate) indicating the degree of breaking of the block received at the radio end. ) Is monitored (S140).

If the main processor 443 determines that the monitored BLER value is greater than or equal to a preset threshold, for example, about 10% (changeable) (S150), the main processor 443 may prepare for communication with the synchronous mobile communication network 200. The synchronization modem unit 434 is activated (S160). At this time, even if the synchronous modem unit 434 is activated, the synchronous mobile communication network 200 does not attempt to be registered. In operation S170, the main processor 443 determines whether the call in the asynchronous mode, which is the current traffic state, is terminated.

If it is determined in step S170 that the call of the asynchronous mode is terminated, the current traffic state is terminated, and thus the mobile communication terminal 400 enters the idle state. For this, it is determined whether the current location is within the area of the asynchronous mobile communication network 100. (S180).

If it is determined in step S180 that the current position of the mobile communication terminal 400 is in the region of the asynchronous mobile communication network 100, the main processor enters the asynchronous mode idle state (S190), and in this case, the synchronous modem unit 434 started in step S160. ) Is disabled.

However, if it is determined in step S180 that the current position of the mobile communication terminal 400 is not in the area of the asynchronous mobile communication network 100, the main processor 443 enters the synchronous idle state because it is in the area of the synchronous mobile communication network (S181). At this time, the asynchronous modem unit 424 is deactivated.

On the other hand, if it is determined in step S170 that the call of the asynchronous mode is not terminated, the main processor 443 determines whether the radio link with the asynchronous mobile communication network 100 is released (S200). That is, it is determined whether the mobile communication terminal 400 is out of the area of the asynchronous mobile communication network 100, and if it is determined that the mobile communication terminal 400 is out of the area of the asynchronous mobile communication network 100, the main processor performs a step. Through the synchronization modem unit 434 started in S160 is switched to the synchronization mode (S210).

Accordingly, traffic currently in progress continues through the synchronous mobile communication network 200. The main processor 443 determines whether the call is terminated (S220). If it is determined in step S220 that the call has ended, the mobile communication terminal 400 enters the idle state. For this purpose, the main processor 443 proceeds to step S180 to determine whether the current location is within the area of the asynchronous mobile communication network 100. do. If it is determined in step S180 that the current position of the mobile communication terminal 400 is in the region of the asynchronous mobile communication network 100, the main processor enters the asynchronous mode idle state (S190), and in this case, the synchronous modem unit 434 started in step S160. ) Is disabled. However, if it is determined in step S180 that the current position of the mobile communication terminal 400 is not in the area of the asynchronous mobile communication network 100, the main processor 443 enters the synchronous idle state because it is in the area of the synchronous mobile communication network (S181). At this time, the asynchronous modem unit 424 is deactivated.

However, if it is determined in step S200 that the asynchronous radio link has not been released, the main processor 443 may determine a preset RSCP value in order to determine whether the current location of the mobile communication terminal 400 is within the area of the asynchronous mobile communication network 100. It is determined whether the reference value (TH) or more (S201).                     

If it is determined in step S201 that the RSCP value is equal to or greater than the preset reference value TH, the main processor 443 determines that the current position of the mobile communication terminal 400 is within the area of the asynchronous mobile communication network 100, and the synchronous modem unit currently being activated. 434 is turned off (S202), and the flow advances to step S170.

In the above-described embodiment, the reception signal code power RSCP has been described as an example, but the same may be implemented using the power value RSSI of the reception signal itself instead of the reception signal code power in steps S20, S120, and S201. .

In addition, in the above steps S20, S120, S201 by measuring the power of the received signal itself and the received signal code power, respectively, and compared with each preset reference value by using both the power of the received signal itself and the received signal code power Of course it can be implemented.

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 mode switching method of the multi-mode multi-band mobile communication terminal according to the present invention, the communication disconnection between the asynchronous mobile communication network and the synchronous mobile communication network is minimized by minimizing communication disconnection when moving from the asynchronous mobile communication network to the synchronous mobile communication network. There is an effect that can perform the mode switch.

Claims (11)

delete delete delete In the mode switching method of a multi-mode multi-band mobile communication terminal comprising an asynchronous modem unit for communication with the asynchronous mobile communication network and a synchronous modem unit for communication with the synchronous mobile communication network, Measuring power of a received signal from the asynchronous mobile communication network; Determining whether the measured power of the received signal is less than or equal to a preset reference value; Determining that the state is maintained for a preset reference time when the power of the received signal is determined to be less than or equal to the preset reference value in step 2; A fourth step of starting the synchronous modem unit if it is determined that the predetermined time period is maintained in the third step; 5 steps for determining whether the call in asynchronous mode is terminated; Determining that the asynchronous radio link is released when it is determined that the call of the asynchronous mode is not terminated; In step 6, if it is determined that the asynchronous radio link is released, the mode of the multi-mode multi-band mobile communication terminal comprises switching to the synchronous mode and performing a call with the synchronous mobile communication network through the synchronous modem unit. How to switch. The method of claim 4, wherein The power of the received signal of the first step is the received signal code power, And the received signal code power is a signal value after the mobile communication terminal decodes a received signal from an asynchronous mobile communication network. The method of claim 4, wherein In the first step, the power of the received signal is the power of the received signal itself and the received signal code power which is a signal value after the mobile communication terminal decodes the received signal from the asynchronous mobile communication network, And in step 2, the power of the received signal itself and the received signal code power are compared with respective preset reference values. The method of claim 4, wherein If it is determined in step 5 that the call of the asynchronous mode is terminated, Determining whether an area in which the mobile communication terminal is currently located is within an area of an asynchronous mobile communication network; In case of the area of the asynchronous mobile communication network, deactivate the synchronous modem unit and enter the asynchronous mode idle state.If it is determined that it is not within the area of the asynchronous mobile communication network, deactivate the asynchronous modem unit and enter the synchronous mode idle state. Mode switching method of band mobile communication terminal. The method of claim 4, wherein In step 6, if it is determined that the asynchronous radio link has not been released, measuring the received signal power from the asynchronous mobile communication network, and determining whether the measured received signal power is more than a predetermined reference value, And deactivating the synchronous modem unit if the received signal power is equal to or greater than the reference value, and repeating the step 5, wherein the mode switching method of the multi-mode mobile communication terminal is performed. The method of claim 8, And if it is determined that the received signal power is not equal to or greater than the reference value, repeating the step 5 while the synchronous modem unit is activated. The method of claim 4, wherein After step 7, Determining whether the call with the synchronous mobile communication network through the synchronous modem unit is terminated in the synchronous mode; and if it is determined that the call with the synchronous mobile communication network is terminated, determining whether the area where the mobile communication terminal is currently located is within the area of the asynchronous mobile communication network. Including the steps of: In case of the area of the asynchronous mobile communication network, deactivate the synchronous modem unit and enter the asynchronous mode idle state. Mode switching method of band mobile communication terminal. The method of claim 4, wherein The fourth step, If it is determined in step 3 that it is maintained for a preset reference time, monitoring the breaking degree of the block received at the radio end, and comparing the breaking degree of the block received at the monitored radio end with a preset threshold value; And starting a synchronous modem if it is determined that the degree of breakage of the received block is greater than or equal to a preset threshold.

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