KR100681898B1 - Mode Switching Method of Multi-Mode Multi-Band Mobile Communication Terminal between CDMA Network and WCDMA Network - Google Patents

Abstract

The present invention relates to a mode switching method for preventing the ping-pong phenomenon during the synchronous-asynchronous mode switching of a multi-mode multi-band (MM-MB) mobile communication terminal.

In the mode switching method of the present invention, in a region where the areas of the asynchronous mobile communication network and the synchronous mobile communication network are overlaid, when the mobile communication terminal receives a system message from the synchronous mobile communication network for switching from the synchronous mobile communication network to the asynchronous mobile communication network, Switching to an asynchronous mode to retrieve an asynchronous signal; A second step of determining whether the asynchronous signal search results, asynchronous signal search, and location registration to an asynchronous mobile communication network; As a result of the determination, when the asynchronous signal is not searched or the position registration to the asynchronous mobile communication network is not performed, the communication mode of the mobile communication terminal is switched to the synchronous mode and counted for a predetermined time, and then fed back to the first step. There is a technical feature in that the third step;

Multimode-Multiband Mobile Communication Terminal

Description

Mode switching method of Multi-Mode Multi-Band Mobile Communication Terminal between CDMA Network and WCDMA Network}

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 for explaining a configuration of a common module of a multi-mode multi-band mobile communication terminal according to the present invention;

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

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

<Description of the reference numerals for the main parts of the drawings>

100: asynchronous mobile network 200: synchronous mobile 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 synchronous-asynchronous mode switching method of a multi-mode multi-band (MM-MB) mobile communication terminal. The present invention relates to a method for switching a connection from a synchronous mobile communication network to an asynchronous mobile communication network and counting a predetermined time and searching for an asynchronous signal. The present invention relates to a mode switching method to prevent frequent ping-pong phenomenon.

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.

The second generation mobile communication service is capable of enhanced voice call and low speed (14.4 Kbps) data service provided by digital cellular type Global System for Mobile (GSM), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), etc. 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.

The mobile communication network for the mobile communication service up to the 2.5th generation includes 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.

The WCDMA system has the advantage of high call quality and spread spectrum, which is suitable for a large amount of data transmission, and it is adopted by most countries by supporting high mobility. The 3GPP, which is organized by many organizations in China, China, etc., is continuously developing technical specifications for WCDMA.

Recently, due to the advantages of the WCDMA system described above, even in countries such as Korea, the United States, and China, which basically provide the CDMA-2000 service, which is a synchronous mobile communication network, a WCDMA network, which is an asynchronous mobile communication network, has started to provide WCDMA service. To this end, a mobile communication terminal supporting both a synchronous mobile network and an asynchronous mobile communication network is required, and a multimode-multiband mobile communication terminal has emerged.

Multimode includes synchronous and asynchronous modes, 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 an area of a synchronous mobile communication network to an overlay area with an asynchronous mobile communication network, it is necessary to switch between a synchronous mode and an asynchronous mode.

However, when the mobile communication terminal enters the overlay area at the time of mode switching, a mode switching is performed immediately. Therefore, when a mobile communication terminal has a problem in the asynchronous mobile communication network and cannot register a location or an asynchronous signal is not detected, a ping-pong phenomenon occurs and the terminal continues. There has been a problem of being unable to make a call, and there are problems such as waste of radio resources and power consumption of a mobile communication terminal due to frequent location registration attempts.

Accordingly, the present invention is to solve the above disadvantages and problems of the prior art, to minimize the ping-pong (PING-PONG) phenomenon that can occur when the MM-MB terminal automatically performs the switch between WCDMA and CDMA SUMMARY OF THE INVENTION An object of the present invention is to provide a method for synchronous-asynchronous mode switching of a multi-mode multi-band (MM-MB) mobile communication terminal.

The object of the present invention is a synchronous-asynchronous mode switching of a multi-mode multiband (MM-MB) mobile communication terminal including a synchronous modem unit for communication with a synchronous mobile communication network, an asynchronous modem unit for communication with an asynchronous mobile communication network. The method of claim 1, wherein in a region where the areas of the asynchronous mobile communication network and the synchronous mobile communication network are overlaid, when the mobile communication terminal receives a system message from the synchronous mobile communication network for switching from the synchronous mobile communication network to the asynchronous mobile communication network, Switching to search for an asynchronous signal; A second step of determining whether the asynchronous signal search results, asynchronous signal search, and location registration to an asynchronous mobile communication network; As a result of the determination, when the asynchronous signal is not searched or the position registration to the asynchronous mobile communication network is not performed, the communication mode of the mobile communication terminal is switched to the synchronous mode and counted for a predetermined time, and then fed back to the first step. The third step is achieved by the synchronous-asynchronous mode switching method of the multi-mode multi-band (MM-MB) mobile communication terminal comprising a.

Details of the above object and technical configuration of the present invention and the resulting effects thereof will be more clearly understood from the following detailed description based on the accompanying drawings.

First, FIG. 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.

As shown, the WCDMA network 100, which is an asynchronous mobile communication network, includes a wireless station 101 for performing wireless communication with the mobile communication terminal 400 and a radio station controller (RNC) 102 for controlling the wireless station 101, The packet service control and packet data transmission are performed through a serving GPS service node (SGSN) 103 connected to the RNC 102 to manage mobility of the mobile communication terminal 400 and a GPRS network 105. Asynchronous communication network data service gateway node (GGSN) 106 which is a relay device.

The RNC 102 is connected to an exchange (MSC) 104 that performs call exchange, and the MSC 104 is connected to a number seven signal network (No. 7 signal network) 107 for signal exchange. The number seven signal network 107 is connected to a short message service center (SMSC) 108 for serving a short message and a home location register (HLR) 109 for managing location information of a subscriber.

On the other hand, the CDMA2000 network 200, which is a synchronous mobile communication network, includes a base station (BTS) 201 for performing wireless communication with the mobile communication terminal 400, a base station controller (BSC, 202) for controlling the BTS 201, A packet data service node (PDSN) 204 connected to the BSC 202 to serve packet data, a data core network (DCN) 208 connected to the PDSN 204 to perform an Internet access service, and the BSC ( And an exchanger (MSC) 203 connected to 202 to perform a call exchange.

The MSC 203 is connected to the number seven signal network 205 for signal exchange, and the number seven signal network 205 provides a short message service center (SMSC, 206) for serving a short message, and the subscriber's location information. A home location register (HLR) 207 for management is connected.

Meanwhile, in the above description, although the synchronization network 200 and the asynchronous network 100 have HLRs 109 and 207 for managing subscriber information and location information, respectively, one HLR (dual stack home location register) is described. ) May allow the synchronization network 200 and the asynchronous network 100 to share subscriber information and location information.

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

As shown, the multi-mode multi-band mobile communication terminal 400 according to the present invention is to support both a synchronous mobile communication service and an asynchronous mobile communication service, and has a respective protocol stack for this purpose.

The mobile communication terminal 400 includes an antenna 410 for transmitting and receiving radio waves with the synchronous mobile communication network 200 and the asynchronous mobile communication network 100, a synchronous radio device 430 for synchronous communication, and an asynchronous radio device for asynchronous communication. 420, a common module 440 for providing common resources in synchronous and asynchronous communication.

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

In addition, the asynchronous radio apparatus 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, and the asynchronous radio transmitter 422. The asynchronous wireless receiver 423 is connected to the antenna 410 through the duplexer 421, and 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.

As shown, the common module 440 of the multi-mode multi-band mobile communication terminal according to the present invention, each modem unit 424 of the synchronous wireless device 430 and the asynchronous wireless device 420 described with reference to FIG. 434 and a plurality of dual port RAMs (DPRAMs 441 and 442), which are connected to the DPRAMs 441 and 442 to control overall and synchronous and asynchronous communication of the mobile communication terminal 400 and execute applications. A main processor 443 that performs.

The main processor 443 is connected to a memory 444 for data storage, an I / O device 445 for connecting a peripheral device, and a power control module (PWM) 446 for power control.

The mobile communication terminal 400 may perform communication in an asynchronous mobile communication network and a synchronous mobile communication network, and perform an asynchronous dedicated communication mode (WCDMA only) that communicates only with an asynchronous mobile communication network. Asynchronous preferred mode (WCDMA preferred) that performs mode switching for communication with a synchronous mobile communication network when it is out of the area of the mobile communication network, and communicates with the asynchronous mobile communication network when entering the asynchronous mobile communication network area. For this purpose, the communication mode may be set and used as one of a synchronization priority mode (CDMA preferred) for performing mode switching and a synchronization only mode (CDMA only) for communicating only with a synchronous mobile communication network.

Next, FIG. 4 is a conceptual diagram illustrating a mode switching parameter setting of a base station and a mode switching method of a multimode multi-band mobile communication terminal according to the present invention.

As shown, the area of the asynchronous mobile communication network is located in the area of the synchronous mobile communication network, and the wireless station of the asynchronous mobile communication network and the base station of the synchronous mobile communication network coexist in an area where the areas of the asynchronous mobile communication network and the synchronous mobile communication network overlap.

When the base station of the synchronous mobile communication network which coexists in the same cell with the radio station of the asynchronous mobile communication network transmits a mode switching command including a parameter for mode switching to the mobile communication terminal, the mobile communication terminal performs switching from the synchronous mode to the asynchronous mode. do.

In this case, when there is a problem in the asynchronous mobile communication network or the electric field of the asynchronous mobile communication network is weak, and the location registration is impossible, the mobile communication terminal cannot continuously talk as the mobile communication terminal switches back to the synchronous mobile communication network and attempts to switch to the asynchronous mobile communication network again. The ping pong phenomenon may occur.

Therefore, when the mobile communication terminal receives a mode switching command from the synchronous mobile communication network, the mobile terminal searches for an asynchronous signal in the asynchronous mode and attempts to register the location. If there is a problem with the switching, the mobile communication terminal returns to the synchronous mode and the periodic asynchronous signal according to the present invention. Asynchronous switching is performed through a search, which will be described with reference to FIG. 5 as follows.

5 is a flowchart illustrating a mode switching process 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 an area where the areas of the asynchronous mobile communication network and the synchronous mobile communication network overlap, when the mobile communication terminal 400 receives a system message from the synchronous mobile communication network for switching from the synchronous mobile communication network to the asynchronous mobile communication network ( In step S101, the mobile communication terminal 400 switches the current communication mode from the synchronous mode to the asynchronous mode (S102), searches for an asynchronous signal, and determines whether an asynchronous signal is found (S103).

When the asynchronous signal is searched, the mobile communication terminal 400 determines whether or not location registration to the asynchronous mobile communication network is completed (S104). When the location registration is completed, the mobile communication terminal 400 communicates through the asynchronous mobile communication network. In this case, location registration in the asynchronous mobile communication network means location registration in the circuit network CS or location registration in the packet network PS.

When the asynchronous signal is not detected in step S103 or the location registration is not performed due to a problem in the asynchronous mobile communication network in step S104, communication in the asynchronous mode is impossible. Switch to (S105).

Next, the mobile communication terminal 400 counts a predetermined time in the synchronous mode (S106), then switches back to the asynchronous mode (S102), searches for an asynchronous signal (S103) and repeats the above process until the location registration is made. do.

In this case, it is preferable that the counting time, that is, the search period, is gradually longer according to a predetermined criterion according to the number of searches of the asynchronous signal, and a parameter value for determining the counting time is included in a system parameter so as to allow mobile communication from a wireless station of the asynchronous mobile communication network. It is transmitted to the terminal 400.

Therefore, when receiving the mode switch command, the mobile communication terminal 400 determines the counting time for the asynchronous signal search using the parameter value, counts the corresponding time, and then searches for the asynchronous signal.

In this case, the mobile communication terminal 400 is preferably set and stored in place of the default parameter value that can be substituted for the parameter value, the mobile communication terminal 400 if the parameter value is not received from the system The counting time is determined using the preset and stored default parameter values.

In one embodiment, the parameter value includes unit interval information (T) for retrieving the asynchronous signal, parameter information (A) for determining the asynchronous signal retrieval interval, and asynchronous signal maximum retrieval count information (Nmax). Can be configured.

When the number of times the mobile communication terminal 400 searches for an asynchronous signal is 'n', the mobile communication terminal 400 determines a signal search period according to the following equation.

t = Aⁿ * T

*T’, 그 다음 카운팅 시간은 ‘

*T’ 가 되는 것이다.In the above equation, the 'n' value, which is the number of times of asynchronous signal search, has a value between '1' and 'Nmax' sequentially. That is, the initial counting time until the mobile communication terminal 400 receives the mode change command and the position registration is not performed again to search for the asynchronous signal is 'A * T', and the position registration is not performed even after the time counting. The counting time to search for a signal is "

* T ', then counting time is'

* T '

*T’로 고정된다.At this time, if the number of asynchronous signal search is equal to or greater than the value of 'Nmax' as the above search process is repeated because the switch to the asynchronous mode is impossible, the asynchronous signal search period is' regardless of the number of subsequent asynchronous signal search.

Fixed at * T '.

The parameter value and equation for determining the counting time may be variously changed, and the 'n' value may have a value between '0' and 'Nmax'.

On the other hand, the present invention is applied only when the communication mode setting state of the multi-mode multi-band mobile communication terminal 400 is an asynchronous priority mode or a synchronous priority mode, and does not apply when the asynchronous dedicated mode or the synchronous dedicated mode.

Accordingly, when the mobile communication terminal 400 receives a mode switching command from the synchronous mobile communication network, the mobile communication terminal 400 determines the current communication mode setting state, and when the determination result is one of the asynchronous priority mode and the synchronous priority mode, the mobile communication terminal 400 searches for an asynchronous signal. desirable.

As those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features, the embodiments described above should be understood as illustrative and not restrictive in all aspects. Should be. 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.

Accordingly, the synchronous-asynchronous mode switching method of the multi-mode multi-band (MM-MB) mobile communication terminal of the present invention is applied to the system state of the asynchronous mobile communication network when the mobile communication mode is switched from the synchronous mobile communication network to the asynchronous mobile communication network. It is possible to prevent the ping-pong phenomenon, to prevent the waste of radio resources and the power consumption of the mobile communication terminal due to frequent location registration, it is possible to minimize the paging loss due to frequent mode changes.

Claims (7)

A multi-mode multiband (MM-MB) mobile communication terminal including a synchronous modem unit for communication with a synchronous mobile communication network and an asynchronous modem unit for communication with an asynchronous mobile communication network, wherein the communication mode is set to asynchronous priority mode or synchronous priority mode. In the synchronous-asynchronous mode switching method of, In a region where the areas of the asynchronous mobile communication network and the synchronous mobile communication network overlap, when the mobile communication terminal receives a system message from the synchronous mobile communication network for switching from the synchronous mobile communication network to the asynchronous mobile communication network, the mobile communication terminal switches to the asynchronous mode and asynchronous signal. Searching for a first step; Determining a result of the asynchronous signal search, whether to search for an asynchronous signal, and whether to register a location in an asynchronous mobile communication network; As a result of the determination, when the asynchronous signal is not detected or the location registration is not performed in the asynchronous mobile communication network, the communication mode of the mobile communication terminal is switched to the synchronous mode and counted for a predetermined time, and then the feedback is returned to the first step. A third step of doing; Method of switching between the synchronous and asynchronous mode of the multi-mode multi-band (MM-MB) mobile communication terminal, characterized in that comprises a. The method of claim 1, The first step, Determining, by the mobile communication terminal, a current communication mode setting state; As a result of the determination, when the communication mode setting state is any one of the asynchronous priority mode and the synchronous priority mode, the asynchronous signal is searched for, between synchronous and asynchronous periods of the multi-mode multi-band (MM-MB) mobile communication terminal. How to switch modes. The method of claim 1, In the third step, the counting time is gradually longer depending on the number of times of asynchronous signal search method of synchronous-asynchronous mode switching of a multi-mode multi-band (MM-MB) mobile communication terminal. delete The method of claim 1, The mobile communication terminal includes a system parameter value including unit interval information (T) for retrieving an asynchronous signal, parameter information (A) for determining an asynchronous signal retrieval interval, and asynchronous signal maximum retrieval number information (Nmax). If the number of asynchronous signal search is n, In the third step, the counting time is determined by Equation Aⁿ * T, and the n value, which is the number of asynchronous signal searches, sequentially has a value between 1 and Nmax. MB) Method of switching between synchronous and asynchronous modes of a mobile communication terminal. The method of claim 5, When the number of asynchronous signal searches is greater than or equal to the maximum number of searches (Nmax), the subsequent counting time is independent of the number of asynchronous signal searches.

A method of switching between synchronous and asynchronous modes of a multimode-multiband (MM-MB) mobile communication terminal, characterized in that determined by * T. The method of claim 5, The system parameter value is And a system parameter value received by the mobile communication terminal from an asynchronous mobile communication network and a system parameter value preset and stored in the mobile communication terminal. Method of switching between synchronous and asynchronous modes of a terminal.

Images