KR20110066320A - Method and system for supporing multi mode terminal in wireless communication system - Google Patents

Abstract

PURPOSE: A method and system for supporting a multi mode terminal in a wireless communication system are provided to process a voice call without using a CS fallback. CONSTITUTION: A first modem searches a first system. When the first system is searched, the first modem checks information which directs the availability of a second system. The first modem transmits second information directing the usability of the second system. The second modem starts booting by the information of the usability of the second system.

Description

METHOD AND SYSTEM FOR SUPPORING MULTI MODE TERMINAL IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a multimode terminal, and in particular, VoIP is supported in a system supporting only packet switching (PS) that does not support circuit switching (CS) voice, such as Long Term Evolution (LTE) and WiMAX. If not, the present invention relates to a method and system for supporting the CS voice.

In the Long Term Evolution (LTE) standard, a radio channel supporting a multi-mode terminal is assumed to be a single radio channel. The terminal radio channel means that only an RF signal for one system can be transmitted and received at any time. That is, multiple systems supported by the multimode terminal cannot communicate with the multimode terminal at the same time. Accordingly, a multi-mode terminal of a single radio channel can communicate with multiple systems by sharing components such as an antenna, an RFIC, an amplifier, and an intermediate frequency (I / F) between chipsets. Since it can also be shared, it has advantages in terms of terminal size and price.

The terminal of the single radio channel has many limitations for multi-mode operation, and to solve this problem, an interface or an operation procedure between systems is defined. One of them is the "Circuit Switching (CS) fallback" technology. The CS fallback is a technology that provides voice service in legacy systems such as Global System for Mobile communications (GSM), Wideband Code Division Multiple Access (WCDMA), or CDMA 1x when the voice over VoIP is not supported like LTE systems. .

In the case of the single radio terminal, since it is impossible to simultaneously receive or transmit signals from two systems, it is difficult to monitor the signal transmitted through the CDMA system when the LTE system is in operation. . In order to solve this problem, the CS fallback scheme connects an existing CDMA network and an LTE network and transmits information on a voice signal from the CDMA network to the terminal through the LTE network. When the terminal receives the information on the voice signal while monitoring the LTE network, the terminal connects to the CDMA network and performs a voice call. If a data call is in progress through the LTE system, the data call is suspended and resumed after the voice call ends.

Referring briefly to the CS fallback procedure, a multi-mode terminal supporting an LTE network and a CDMA network initially accesses the LTE network and performs a CDMA operation such as a registration procedure through an interface. A paging message received by the CDMA system is also transmitted to the LTE network through the interface and to the terminal. If the terminal receives a paging message through the CDMA network, it connects a voice call by driving an internal CDMA modem for accessing the CDMA network. At this time, if the data call of the LTE network is being performed, it pauses and connects the voice call of the CDMA network.

However, through the CS fallback scheme, a delay occurs during voice call processing. In other words, while receiving information through the LTE network, a delay occurs to initialize the CDMA network to process the voice call. In particular, when powering off the CDMA modem chip to save power of the terminal, booting the CDMA modem chip during the CS fallback and timing synchronization is performed. It takes a considerable time.

An object of the present invention is to provide a method and system for a dual radio channel-based multimode terminal structure and operation procedure capable of processing a voice call without using CS fallback in a wireless communication system.

Another object of the present invention is to provide a method and system for reducing overhead in deploying an LTE system by minimizing modification of legacy modems of legacy networks and terminals.

Another object of the present invention is to provide a method for minimizing power consumption of a terminal based on a dual radio channel.

Another object of the present invention is to provide an efficient terminal operation method when a CDMA voice call is received during an LTE data call when it does not support SVD (Simultaneous Voice and Data) service.

According to a first aspect of the present invention for achieving the above objects, in a method for the initialization procedure of a multi-mode terminal supporting dual radio in a wireless communication system, the first modem is Searching for a first system; when the first system is discovered; checking information from the first system indicating whether the second system is available; And transmitting information indicating whether the second system is available to a second modem, and starting booting according to the information indicating whether the second system is available to the second modem. It features.

According to a second aspect of the present invention for achieving the above object, in a method for initializing a multi-mode terminal for supporting a dual radio (dual radio) in a wireless communication system, at least two or more Modem independently characterized in that it comprises the step of searching each of its own system, and the process of selecting a system for call connection according to the priority among the at least one or more searched system.

According to a third aspect of the present invention for achieving the above object, in a method for an idle mode of a multi-mode terminal supporting dual radio in a wireless communication system, Monitoring the paging in the idle mode by the first modem, informing the processor of receiving the SMS message when the first modem receives the SMS message during the paging monitoring interval, and by the processor based on the SMS message. Determining whether to start a program for a data application, requesting a data call to a second modem at the beginning of the program, and connecting and processing a data call when the second modem receives a data call request from the processor. It characterized in that it comprises a process.

According to a fourth aspect of the present invention for achieving the above objects, in a method for processing a call for a multi-mode terminal supporting dual radio in a wireless communication system, a data call is generated The application server transmits an SMS message to the multimode terminal through an SMS server, and the multimode terminal receives the SMS message using a first modem, and transmits the data application based on the received SMS message. And starting a program for the program and processing the data call by selecting a modem for processing the data call.

As described above, using a dual receiver or a dual transceiver in a packet-switched (PS) based system that does not support VoIP and a multi-mode terminal that supports a legacy system, without modifying the existing legacy system for CS fallback support, It is possible to efficiently support LTE data calls and CDMA voice calls without establishing an interface between the LTE network and the legacy legacy system. In addition, the CDMA network can reduce the power consumption of the terminal by not running the LTE system in the region where the terminal does not have LTE network through the LTE indication information. In addition, by eliminating paging for the data call in the LTE network through the data call initiation procedure through the CDMA SMS message, the LTE system of the UE does not need to periodically monitor the paging, thereby efficiently saving power consumption of the idle mode of the UE. Can be reduced.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of related well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, the present invention will be described for.

The present invention defines the structure and operation of a multi-mode terminal that simultaneously supports 4th generation standards such as Long Term Evolution (LTE) and WiMAX and existing 2nd generation / 3 generation standards. In particular, a method for supporting voice based on circuit switching (CS) in a system supporting only packet switching (PS) such as LTE and WiMAX is proposed. In the following description, an LTE system and a legacy system CDMA system are described as an example. However, the present invention can be applied to other two types of wireless communication systems, for example, a WiMAX system and a Global System for Mobile Communication (GSM) system.

Meanwhile, the terminal proposed in the present invention is basically a multi-mode terminal supporting dual radio channels. The multi-mode terminal supporting the dual radio channel may be divided into a terminal having a dual receiver function and a terminal having a dual transceiver function. Here, in case of a terminal supporting the dual receiver, LTE and CDMA may share a transmission antenna.

Looking at the antenna and the RF path structure of the terminal supporting the dual transceiver, LTE system requires two antenna and receive RF path to support the Multi Input Multi Output (MIMO). RFIC is a block that supports multiple frequency bands. It uses LTE band, CDMA band, Rx, Tx using duplexer, diplxer, multiplexer, switch, etc. Separate and combine bands. Multiple frequency bands are also available within each system. For example, CDMA uses the US-PCS band, the AWS band, and the cellular band.

When the LTE system and the CDMA system share the antenna, antenna 1 is used for LTE reception, LTE transmission, antenna 2 is used for LTE / CDMA reception, CDMA transmission. Alternatively, the LTE system and the CDMA system may use different antennas.

Meanwhile, when two receive RF paths are required for Rx diversity in a CDMA system, there are two, three, and four antennas. When two are used, antenna 1 may be used for LTE / CDMA reception and LTE transmission, and antenna 2 may be used for LTE / CDMA reception and CDMA transmission. When using three, antenna 1 may be used for LTE reception, LTE transmission, antenna 2 may be used for LTE / CDMA reception, antenna 3 for CDMA reception, CDMA transmission. When using four antennas, each system uses two antennas independently.

The modem chipset for the multimode terminal may be configured with a single modem chip, or may be configured with multiple modem chips. In the case of a terminal using an AP, an independent AP may be used and a modem chip may be included.

1 is a structural example of a modem chipset and an AP (Application Processor) according to the present invention.

Referring to FIG. 1 (a), in a structure of a modem chipset and an application processor (AP), a multimode terminal is composed of an LTE modem chipset and a CDMA chipset including an AP.

Referring to FIG. 1B, in the structure of a modem chipset and an AP, a multimode terminal is composed of an AP chipset and a chipset including an LTE modem and a CDMA modem.

Referring to FIG. 1 (c), in the structure of a modem chipset and an application processor (AP), a multimode terminal is composed of an LTE modem chipset, a CDMA modem chipset, and an AP chipset.

Referring to FIG. 1 (d), in a structure of a modem chipset and an application processor (AP), an LTE modem, a CDMA modem, and an AP consist of one chipset.

The multimode terminal structure is configured by combining an antenna, an RFIC, and a modem / AP structure.

The LTE system supports only PS (Packet Switching) and requires a VoIP implementation for a voice call. If VoIP is not supported in the LTE system, a voice call must be supported using an existing legacy system, that is, a CDMA system.

The operation scenario proposed in the present invention is based on a structure in which the AP determines the overall terminal operation and controls the two modems while the LTE system and the CDMA system operate independently of each other.

Operation of a multi-mode terminal based on a dual radio channel will be described by dividing into a system initialization step, an idle mode, and a connected mode.

There are two options in the system initialization phase. The first is to run the CDMA system first and then the LTE system if necessary. Here, since a new network like the LTE network is preferentially deployed around a specific region, it is assumed that the service range of the CDMA network is much wider than that of the LTE network. It informs the availability of the LTE network through the CDMA network and runs the LTE system only when the LTE network is available, thereby reducing the power consumption of the terminal because the terminal does not search the LTE network in an area without the LTE network. . An LTE indicator indicating the availability of the LTE network is defined as 1 bit and broadcasted as a CDMA overhead message. Depending on the implementation, CDMA overhead messages can be sent in unicasting or multicasting.

The second case is to run LTE and CDMA systems at the same time. In the absence of additional information such as LTE indicators, the two systems must search the network independently. If the two systems fail to acquire the network for a certain period of time, they scan the network periodically. The AP manages the network acquisition of two systems, and if a voice call or data call is needed, the system to which the call is connected is determined in consideration of the acquisition of the network of each system or determined through a user interface (UI). Can be.

2 is a flowchart illustrating an initialization procedure of a multi-mode terminal supporting dual radio channels in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 2, when power is supplied to the multi-mode terminal, the CDMA chipset and the AP chipset are booted in step 200.

The CDMA modem performs a CDMA network search in step 202 and checks whether a CDMA network exists in step 204. If there is a CDMA network in step 204, network synchronization is performed in step 210, and the idle mode is entered in step 212. In step 214, the LTE indicator information (indicator) is checked, and when receiving the LTE indication information indicating that the use of the LTE network, it notifies the AP chipset. If the LTE network is not available, the process proceeds to step 216 to perform the registration process to the CDMA network. In step 218, the system transitions to the idle mode to monitor CDMA paging.

In contrast, when the CDMA network does not exist in step 204, the sleep mode operation is performed in step 206, and the CDMA network is periodically searched. If the CDMA network date is not detected in step 208, the process proceeds to step 206, and when the CDMA network date is detected, the process proceeds to step 210 to perform network synchronization, and then steps 212 to 218 are performed.

On the other hand, the AP chipset starts the processor through an initialization procedure in step 220, and notifies the LTE modem when there is no CDMA network based on the CDMA network search from the CDMA modem. If there is a CDMA network, it is determined whether there is LTE indication information from the CDMA modem in step 223. If there is no LTE indication, it notifies it to the LTE modem, and if there is LTE indication, it is checked whether the LTE network is available in step 224. If the LTE network is available in step 224, it is notified to the LTE modem. If the LTE network is not available, the process proceeds to step 226 and periodically searches for the LTE network.

On the other hand, if the LTE modem is informed in step 228 that the CDMA does not exist, or LTE presence information or LTE availability from the AP chipset, the LTE modem is booted in step 228.

Thereafter, the LTE modem searches for the LTE network in step 230 and checks whether the LTE network exists in step 232. When the LTE network exists in step 232, the mobile station enters the idle mode in step 234 and connects to the network in step 236 to obtain an IP address. The idle mode is continued in step 238. If in sleep mode

In contrast, when the LTE network does not exist in step 232, the sleep mode operation is performed in step 240, and the LTE network is periodically searched. If the LTE network is not detected in step 240 proceeds to step 240, if the LTE network is found in step 234 proceeds to the idle mode.

As described above, when there is no LTE indication information (i.e., when the CDMA modem and the LTE modem are driven independently) or when the LTE indication information indicates that the LTE network is available, the terminal boots the LTE modem. And search the LTE network. When the LTE indication information indicates that the LTE network is not available, the terminal does not drive the LTE modem, and waits for the LTE network to be available while periodically checking the indication information or periodically searches for the LTE network. Therefore, it is possible to reduce the power consumption of the terminal by preventing unnecessary LTE network search.

FIG. 3 illustrates an idle mode procedure of a multi-mode terminal supporting dual radio channels in a wireless communication system according to an exemplary embodiment of the present invention. It is assumed that the multi-mode terminal operates in the idle mode by the initial procedure of FIG.

Referring to FIG. 3, the CDMA modem monitors CDMA paging in idle mode in step 300 and checks whether an SMS message is received in step 302.

If the SMS message is received in step 302, it is notified of this to the AP chipset.

If there is no data call request from the AP chipset in step 304, the process proceeds to step 300, and if there is a data call request from the AP chipset, step 306 proceeds to set up a data call based on the IP request. In step 308, the data call is performed based on the IP. When the data call is terminated in step 310, the process proceeds to step 300.

Meanwhile, the AP chipset waits to receive an SMS message in idle mode and checks the SMS message in step 320.

If the SMS message is received from the CDMA chipset in step 320 or the SMS message is received through the modem chipset, the controller proceeds to step 322 to determine whether the SMS message is for a data application. If it is not an SMS message for the data application, the flow proceeds to step 326 to perform a normal SMS message receiving operation.

If the SMS message for the data application, the flow proceeds to step 328 to start the client for processing the data application. Depending on the implementation, the user may start the data application by receiving a user input through the user interface in step 330 and confirming that the user can start the data application in step 332. Therefore, when the user starts the data application in step 332, the client may be started.

Thereafter, in step 334, it is determined whether the LTE network is available, when the LTE network is not available, in step 336, it is determined whether the CDMA network is available, and when the CDMA network is available, a data call is requested to the CDMA modem. If the CDMA network is not available, the process proceeds to step 338 to perform a system failure processor.

On the contrary, when the LTE network is available in step 334, it notifies the LTE modem and activates the data call in step 340. In step 342, the client checks whether the client is terminated. When the process is terminated, the process proceeds to step 344 to wait for SMS message reception or to wait for user input.

Meanwhile, in step 350, the LTE modem does not monitor the paging and continues the idle mode. In the present invention, the LTE modem does not need to monitor paging because it is informed whether or not to receive a data call from the AP chipset.

Thereafter, in step 352, if there is a data call request from the AP chipset, if there is a data call request, the process proceeds to step 354 to set up a data call and performs a data call in step 356.

Thereafter, the method checks whether the data call is terminated in step 358, and when the data call ends, proceeds to step 360 to monitor paging in the idle mode. Thereafter, when the client terminates, the process proceeds to step 350.

As described above, in case of a terminal supporting dual transceivers, when two systems perform an idle mode operation such as registration, network attach, or tracking area update (TAU) It is performed independently regardless of its operation. It is also possible for two systems to transmit simultaneously. Since a terminal supporting only dual receivers cannot transmit at the same time, it is necessary to check the operation of other systems in order to transmit in idle mode. Each system checks to see if another system is transmitting to the AP if transmission is required. If the transmission RF path is available, the transmission completion is reported to the AP after performing the transmission.

When the two systems operate in the idle mode, power consumption is greater than that of a single radio channel-based terminal. In general, a communication system operates in a DRX mode in an idle mode. In the DRX mode, since the paging is periodically transmitted from the base station, the terminal operates in the active mode only in the section in which the paging is transmitted, and operates in the power saving mode in other sections except the DRX mode. The power consumption of active mode and power saving mode is about 100 ~ 400 times different. Accordingly, the idle mode power consumption of the terminal is affected by the DRX cycle and the "wake up duration" operating in the active mode. In order to reduce idle mode power consumption of the terminal, it is necessary to increase the DRX cycle as much as possible and minimize the wake up duration. The DRX cycle defined in the LTE standard is up to 2.56 sec, which is shorter than the conventional system. Instead, the wake up duration is small compared to the conventional system because the TTI is short as 1 [msec]. Since the terminal proposed in the present invention does not support voice calls through the LTE network, paging for the voice signal is not transmitted through the LTE network, and only paging for the data signal is transmitted.

The present invention proposes a method of increasing the LTE DRX cycle as much as possible by eliminating paging for data signals through the LTE network and minimizing idle mode power consumption of the terminal. Data signals can occur in e-mail or instant messaging (IM) services. When an e-mail is received from the outside, the e-mail server notifies the arrival of the e-mail by paging and transmits the data through a data transmission / reception channel. However, this is possible only when the email client is already activated on the terminal and informs the server of the active state. That is, in order to receive an email through paging in the LTE terminal, the email client must be continuously activated. Another method of receiving an e-mail from the outside is that when the e-mail server receives an e-mail from the outside, the e-mail server transmits the service type and the URL (Uniform Resource Locator) address of the server to the corresponding terminal through a short message service (SMS). After running the client, the server requests a data call using the URL of the server and receives an e-mail through the data channel. In this method, the client corresponding to the service received through the SMS message can be started without closing the client for various services such as e-mail or instant messenger.

The LTE / CDMA multimode terminal receives the SMS message through the CDMA network, runs the client, selects the network based on the priority of the LTE system and the CDMA system and the availability of each network, Attempt to connect data call through network. For most data calls, LTE systems have a high priority, so if an LTE network is available, try to connect the data call to the LTE network, otherwise try to connect to the CDMA network. In this method, the terminal only needs to monitor LTE paging while the client of the service requiring the data call is active.

On the other hand, although not shown, in the connected mode (connected mode) proposes a terminal operation for the case where the data call and the voice call occurs at the same time. A terminal capable of simultaneous transmission of a data call and a voice call can basically support Simultaneous Voice and Data (SVD), but a terminal capable of dual reception only or a terminal that does not support the SVD feature can be selected depending on the user's choice. Only one of the calls should be chosen. Detailed operation scenarios for each case are as follows.

1. During a data call connection through the LTE network, if a voice signal is received, suspend the LTE data call, notify the user of the arrival of the voice signal, and ask whether the voice call is connected. When the user selects a voice call, the voice call is connected through the CDMA network. After the voice call ends, the LTE data call is resumed. If the user rejects the voice call, it releases the CDMA traffic channel and resumes the LTE data call.

2. If a user attempts to make a voice call during data call connection through the LTE network, the LTE data call is suspended and the voice call is connected. After the voice call ends, the LTE data call is restarted.

3. If an SMS message for a data call is received during voice call connection through the CDMA network, connect the data call to the LTE or CDMA network after the voice call is completed. According to the terminal request, the user may be notified of the data call reception and the user may select the terminal operation.

4. If a user attempts to make a data call during a voice call over the CDMA network, the user can select whether to release the voice call and perform a data call connection, and terminate the data call attempt or make a voice call according to the user's selection. After clearing, try to call data.

LTE system suspend uses the CS fallback standard's suspend message, defines a new message, or uses a reserved bit of an existing standard. The LTE system resume may be performed by the terminal sending an uplink message. A Tracking Area Update (TAU) message is an example of a message that can be easily used. When the suspend message is transmitted from the terminal, the base station buffers the data without transmitting any more data to the LTE terminal, and transmits the buffered data to the terminal when a resume request using a TAU message is received from the terminal.

Operators deploying LTE networks want to be connected to users through LTE networks with high network efficiency whenever possible. Since the LTE network always provides a function, it is possible to receive an incoming data call even in idle mode. That is, it is possible to push an email or receive an instant message. However, in order to receive such incoming data through the LTE network, the application client must be activated and connected to the application server. That is, in order to receive an e-mail or an instant message, the corresponding client should always be activated on the terminal.

In addition, in case of a dual radio channel-based terminal, simultaneously monitoring a paging channel of an LTE network and a CDMA network in an idle mode, power consumption increases, thereby reducing standby time.

To solve this problem, when incoming data arrives at the application server, the application server notifies the application type and data arrival through an SMS message, and the terminal activates the client according to the contents of the SMS message, and the network priority and network priority and Depending on availability, the network is selected to receive the data.

4 illustrates a flowchart for processing a call for a multi-mode terminal supporting dual radio channels in a wireless communication system.

In FIG. 4, the network structure includes an LTE network consisting of an eNB, MME, S-GW, and P-GW, a CDMA network consisting of BTS, BSC, MSC, and PDSN, an SMS server, and an application server incorporating a dual mode controller. The multi-mode terminal can be connected to the BTS and the eNB at the same time.

Referring to FIG. 4, when the terminal enters the idle mode, the terminal does not activate an application such as an email or an instant message (400). Here, when the UE is in the LTE network in the idle mode, the UE connects to the LTE network and simultaneously registers the CDMA network to monitor CDMA paging. If the application client is not activated, the terminal does not monitor the LTE network.

Thereafter, when an email or an instant message arrives at the application server (402), the application server checks whether the terminal is connected to the CDMA network or the LTE network. If there is no connection, the application server and the URL of the server are transmitted as an SMS message through the SMS server (402).

Thereafter, the terminal checks the SMS message and activates the client of the corresponding application when the message is transmitted from the application server (404), and checks which network is currently accessible. If both networks are available, network access is performed according to the specified priority. If only one network is available, connect to the network and request a connection. If neither network is available, perform a defined system failure process.

If the LTE network is available, the terminal establishes an RRC connection to the LTE network (406), requests for service (408), and the LTE network forwards the service request of the terminal to an application server (410). Thereafter, the terminal receives downlink data from the application server.

Then, after releasing the RRC connection (418) but when the email or instant message arrives to the application server in the state that the client is not terminated (415), the application server is downlink data (i.e., email or instant message to the LTE network) (416). The LTE network transmits paging to the terminal when receiving downlink data from the application server (416). While monitoring paging in idle mode, the terminal sets up 420 an RRC connection (420) upon receiving paging (418) and receives data (422) from the application.

If the CDMA network is available, the terminal sets up a traffic channel of the CDMA network (430) and requests service from the CDMA network (432). When the CDMA network performs service setup 434 with an application server, the terminal receives data from an application server over the traffic channel (436).

Then, after the traffic channel is released (438) but the client is not terminated and an email or instant message arrives at the application server (440), the application server sends downlink data (i.e., email or instant) to the CDMA network. Message). The CDMA network transmits paging to the terminal upon receiving downlink data from the application server (444). While monitoring paging in idle mode, the terminal sets up 446 a traffic channel when receiving paging (444) and receives data (448) from the application.

As described above, when the data connection is connected, the terminal receives an email or an instant message. When the user exits the client, it notifies the application server and releases the data connection. The application server disconnects from the LTE network or the CDMA network.

If the data transmission and reception is not longer than a certain time without the client is terminated, the terminal releases the RRC connection when the network to which the data connection is connected is an LTE network, and enters an idle mode by canceling the traffic channel in the case of a CDMA network. If the client is not terminated, the terminal monitors the paging channel of the network to check whether new data is received.

In another implementation, when a new email or instant message arrives at the application server while connected to a CDMA or LTE network, the application server transmits data to the connected network. If the RRC connection is terminated in the LTE network or in the idle mode in the CDMA network, the BTS or eNB transmits paging to the UE, the UE transmits a paging ACK, requests a data connection, and receives data. If the UE cannot receive the paging from the LTE network or the CDMA network, the network disconnects from the application server. If there is no data to be transmitted while there is no connection with the network, the application server periodically transmits an SMS message to the terminal through the SMS server until it is connected to the LTE network or the CDMA network at the request of the terminal. When a system failure occurs in a network where a data connection is connected while the client is activated, the terminal searches for another network and, if available, requests a network connection again and connects with the application server. The application server determines that the terminal is connected to the new network and disconnects from the existing network when a new connection request is made to another network while the existing connection with the LTE network or the CDMA network exists. That is, the application server maintains a connection with one of the LTE network and the CDMA network.

When the client is terminated, the connection between the application server and the network is disconnected. Therefore, the terminal does not need to monitor paging of the LTE network. Only the CDMA paging channel needs to be monitored for incoming voice call and SMS message reception.

Therefore, when using this method, application clients capable of receiving incoming data do not always need to be activated on the terminal, and the existing CDMA only terminal does not need to monitor paging of the LTE network when the application client is not activated. Compared with that, the power consumption hardly increases, and a similar waiting time can be maintained.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a structure of a modem chipset and an AP (Application Processor) according to the present invention;

2 is a flowchart illustrating an initialization procedure of a multi-mode terminal supporting dual radio channels in a wireless communication system according to an embodiment of the present invention;

3 is a flowchart for an idle mode procedure of a multi-mode terminal supporting dual radio channels in a wireless communication system according to an embodiment of the present invention;

4 is a flowchart for processing a call for a multi-mode terminal supporting dual radio in a wireless communication system.

Claims (14)

In the method for the initialization procedure of a multi-mode terminal that supports dual radio in a wireless communication system, Searching for the first system by the first modem, When the first system is found, checking, from the first system, information indicating whether the first modem is available for use by the first system; Transmitting, by the first modem, information indicating whether the second system is available to the second modem; Starting the booting according to the information indicating whether the second modem is available for use by the second modem. The method of claim 1, The first system is a legacy system of the second system. The method of claim 1, And a processor for periodically searching for a second system when the second system is not available. In the method for the initialization procedure of a multi-mode terminal that supports dual radio in a wireless communication system, At least two modems independently discover their own systems, Selecting a system for call connection according to a priority among the at least one searched system. The method of claim 4, wherein The system selected for the call connection monitors call origination of another system that is not selected. A method for an idle mode of a multi mode terminal supporting dual radio in a wireless communication system, Monitoring the paging in idle mode by the first modem, Notifying the processor of receiving an SMS message when the first modem receives an SMS message during a paging monitoring interval; Determining whether the processor starts a program for a data application based on the SMS message, and requesting a data call from a second modem at the start of the program; And when the second modem receives a data call request from the processor, connecting and processing a data call. The method of claim 6, Receiving a data call request from the processor when the first modem does not receive an SMS message during a paging monitoring interval; And processing a data call requested from the processor. The method of claim 6, Starting the program for a data application when the processor is requested to start a program for a data application through a user interface. The method of claim 6, When the processor fails to perform data call processing through the second modem, requesting a data call from the first modem. The method of claim 6, When the second modem receives a data call request from the processor, connecting the data call to process a data call; And the second modem does not monitor paging during the idle mode. The method of claim 10, Transitioning, by the second modem, to a valid mode for monitoring paging when the data call ends; Transitioning to a valid mode that does not monitor paging when a program for a data application processing the data call is terminated.  A method for processing a call for a multi-mode terminal supporting a dual radio in a wireless communication system, When the data call occurs, the application server sends an SMS message to the multi-mode terminal through the SMS server, Receiving, by the multi-mode terminal, the SMS message using a first modem, starting a program for a data application based on the received SMS message; And selecting, by the multi-mode terminal, a modem for processing the data call and processing the data call. The method of claim 12, Disconnecting when the data call processing ends; After the connection is released, when a new data call occurs, the selected modem transmits paging to the multimode terminal; And starting the connection when the multimode terminal receives the paging. The method of claim 6, Disconnecting when the data call processing ends; And after the connection is released, deactivating the program for the data application when the multi-mode terminal does not generate a data call for a predetermined time.

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