KR20140088792A - Dual mode terminal and controlling method therefor - Google Patents

Abstract

In a dual-mode terminal which can be connected to a plurality of networks, a rapid and efficient attempt for connection to an advanced network can be made in a state of the connection to one network according to a method of the present invention. Accordingly, a user who uses a dual-mode terminal can be provided with a high data transmission/reception speed by the fast network.

Description

DUAL MODE TERMINAL AND CONTROLLING METHOD THEREFOR [0001]

The present invention relates to a dual-mode terminal and a control method therefor. More particularly, the present invention relates to a dual mode terminal capable of efficiently connecting to a network of a higher priority while being connected to a network of a latter one, and a control method thereof.

In the wireless mobile communication field, not only voice communication but also data transmission and reception have been steadily evolving. Currently, 4th generation mobile communication technology, for example, LTE (Long Term Evolution) wireless communication system is attracting attention. However, in the situation where the fourth generation communication network and the third generation communication network that have been commercialized are mixed, the mobile communication terminal or the mobile communication data card is not only used for the fourth generation mobile communication technology, but also for the 3G mobile communication technology At the same time. Therefore, a mobile terminal or a data card type device (hereinafter referred to as a dual mode terminal) having a dual modem processor is needed to simultaneously support the next generation mobile communication technology and the existing generation mobile communication technology.

Dual mode terminals are equipped with two modems with different communication methods and support wireless communication using each, and are mainly used in areas where heterogeneous communication networks are mixed. 2. Description of the Related Art As a typical example of a dual mode terminal, a device capable of using both LTE (Long Term Evolution) wireless communication and WCDMA (Wideband Code Division Multiple Access) wireless communication is attracting attention. In the present invention, a dual mode terminal capable of communicating with both an LTE network and a WCDMA network is exemplified, but other types of wireless communication can also be applied to those skilled in the art. It is true.

The LTE network is an advanced network rather than the WCMDA network, and the LTE network, which is a more advanced network in the dual mode terminal, is used as the senior network, and the WCDMA network is used as the subordinate network. Therefore, there is a need for a method for controlling the dual mode terminal to connect to the LTE network as soon as possible.

Based on the above discussion, a dual mode terminal capable of quickly and efficiently connecting to a senior network while connected to a subordinate network and a control method therefor are proposed.

According to an aspect of the present invention, there is provided a dual mode terminal including a first wireless communication module for communicating with a first network, a second wireless communication module for communicating with a second network, And a processor for processing a signal received from the first network and a signal received from the second network, wherein when the processor is transmitting and receiving data through the first network, the processor stops transmitting and receiving the data, Mode to an idle mode and attempts to connect to the second network.

According to another aspect of the present invention, there is provided a method of controlling a dual mode terminal, including: transmitting and receiving data through a first network; stopping transmission and reception of data; Switching to an idle mode, and attempting to connect to the second network.

According to the embodiment of the present invention, there is an advantage that the dual mode terminal can provide a control method of the dual mode terminal that can quickly and quickly connect to the priority network while being connected to the backward network.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

1 is a diagram conceptually showing a network structure of an E-UMTS.
2 is a conceptual diagram illustrating a network structure of an evolved universal terrestrial radio access network (E-UTRAN).
3 and 4 illustrate a control plane and a U-Plane (User-Plane) structure of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard Fig.
5 is a diagram illustrating a structure of a dual mode terminal of the present invention.
6 is a diagram illustrating a case where a dual mode terminal is switched between networks when operating in an idle mode.
7 is a diagram illustrating a case where a dual mode terminal is switched between networks when operating in an activated mode.
8 is a diagram illustrating an example of a method for switching a connection from a WCMA network to an LTE network, in accordance with an embodiment of the present invention.
9 is a flow diagram of a method for switching a connection from a WCMA network to an LTE network, in accordance with an embodiment of the invention.
10 illustrates a block diagram of a terminal device according to an embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details. For example, the following detailed description assumes that the main mobile communication system is a 3GPP LTE system, but it is applicable to any other mobile communication system except for the specific aspects of 3GPP LTE.

In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, centering on the core functionality of each structure and device, to avoid obscuring the concepts of the present invention. In the following description, the same components are denoted by the same reference numerals throughout the specification.

In the following description, it is assumed that the UE collectively refers to a mobile stationary or stationary user equipment such as a UE (User Equipment) and an MS (Mobile Station). It is also assumed that the base station collectively refers to any node of a network end that communicates with a terminal such as a Node B, an eNode B, and a base station.

Prior to describing the present invention, the Evolved Universal Mobile Telecommunications System (E-UMTS), which is a technical field to which the present invention is applied, and related technical features will be described below.

1 is a diagram conceptually showing a network structure of an E-UMTS. In particular, the E-UMTS system has evolved from the existing WCDMA UMTS (Universal Mobile Broadband Code Division Multiple Access) system and is currently undergoing standardization work in the 3rd Generation Partnership Project (3GPP). E-UMTS is also called Long Term Evolution (LTE) system. For details of the technical specifications of UMTS and E-UMTS, refer to Release 7 and Release 8 of "3rd Generation Partnership Project (Technical Specification Group Radio Access Network)" respectively.

Referring to FIG. 1, an E-UMTS is an Access Gateway (hereinafter referred to as AG) located at the end of a UE, a cell (eNB), and a network (E-UTRAN) . Typically, an eNB may simultaneously transmit multiple data streams for broadcast services, multicast services, and / or unicast services. An interface for transmitting user traffic or control traffic may be used between eNBs.

The AG may be divided into a part for handling user traffic and a part for processing control traffic. At this time, a new interface between the AG for processing new user traffic and the AG for processing control traffic can be communicated with each other. Also, the AG manages the mobility of the UE in a TA (Tracking Area) unit, and the TA is composed of a plurality of cells. If the terminal moves from one TA to another TA, it informs AG that the TA where it is located has changed.

The CN (Core Network) can be configured as a network node for user registration of AG and UE. An interface for distinguishing E-UTRAN and CN may be used.

2 is a conceptual diagram illustrating a network structure of an evolved universal terrestrial radio access network (E-UTRAN).

Referring to FIG. 2, the E-UTRAN system is an evolved system in an existing UTRAN system. The E-UTRAN is composed of cells (eNBs), and the cells are connected via the X2 interface. The cell is connected to the terminal through the air interface, and is connected to the EPC (Evolved Packet Core) through the S1 interface.

EPC is composed of MME (Mobility Management Entity), S-GW (Serving-Gateway) and PDN-GW (Packet Data Network-Gateway). The MME has information on the access information of the terminal or the capability of the terminal, and this information is mainly used for managing the mobility of the terminal. The S-GW is a gateway having an E-UTRAN as an end point, and the PDN-GW is a gateway having a PDN (Packet Data Network) as an end point.

3 and 4 illustrate a control plane and a U-Plane (User-Plane) structure of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard Fig. In particular, the wireless interface protocol consists of a physical layer, a data link layer, and a network layer vertically, and horizontally includes a user plane for data information transmission and a control plane And a control plane for signal transmission.

The protocol layers of FIGS. 3 and 4 are based on an Open System Interconnection (OSI) reference model widely known in communication systems. The lower three layers are referred to as L1 (first layer), L2 (second layer) , And L3 (third layer).

The control plane is a path through which control messages used by the UE and the network to manage calls are transmitted. The user plane means a path through which data generated in the application layer, for example, voice data or Internet packet data, is transmitted. Hereinafter, the layers of the control plane and the user plane of the wireless protocol will be described.

The physical layer as the first layer provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to the upper layer of Medium Access Control (MAC) layer through a transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. Data is transferred between the transmitting side and the receiving side physical layer through the physical channel. The physical channel is modulated by an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time and frequency as radio resources.

The MAC layer of the second layer provides a service to a radio link control (RLC) layer, which is an upper layer, through a logical channel. The RLC layer of the second layer supports reliable data transmission. The function of the RLC layer may be implemented as a function block inside the MAC. In this case, the RLC layer may not exist. The Packet Data Convergence Protocol (PDCP) layer of the second layer performs a header compression function to reduce unnecessary control information for efficiently transmitting an IP packet such as IPv4 or IPv6 in a wireless interface with a narrow bandwidth .

A Radio Resource Control (RRC) layer located at the bottom of the third layer is defined only on the control plane and includes a configuration, reconfiguration, and release of radio bearers (RBs) And controls the logical channels, the transport channels, and the physical channels. The radio bearer means a service provided by the second layer for data transmission between the UE and the E-UTRAN. To this end, the RRC layer exchanges RRC messages between the UE and the network.

In FIG. 3, the Non-Access Stratum (NAS) layer at the top of the RRC layer performs functions such as session management and mobility management. The NAS layer exists in the Mobility Management Entity (MME) of the UE and the network.

The MME is a key control-node in an LTE access network. The MME is responsible for the tracking and paging procedures for the terminals in the idle state. In addition, the MME participates in the radio bearer activation / deactivation process and is responsible for selecting a Serving Gateway (SGW) at the time of 'Initial Attach' or during an intra-LTE handover including a core network relocation. It is. The MME takes charge of terminal authentication through interaction with a Home Subscriber Server (HSS). The NAS signaling is terminated at the MME, and the MME is responsible for creating and assigning a temporary identifier to the terminal. The MME verifies that the terminal has the authority to camp-on the service provider's PLMN (Public Land Mobile Network). MME is the endpoint for encryption / integrity protection for NAS signaling in the network and is responsible for security key management. The MME provides a control plane function for mobility between LTE and 2G / 3G access networks.

In the NAS layer, two states of EMM (EPS Mobility Management) registration state (EMM-REGISTERED) and EMM unregistered state (EMM-UNREGISTERED state) are defined for terminal mobility management, and these states are applied to the terminal and the MME. The initial terminal is an EMM unregistered state, and the terminal performs a process of registering with the network through an initial attach procedure to access the network. When the contact procedure is successfully performed, the terminal and the MME are in the EMM registration state.

In the NAS layer, two types of ECM (EPS Connection Management) idle state (ECM_IDLE) and ECM connection state (ECM_CONNECTED) are defined to manage a signaling connection between a terminal and an EPC. . When the UE in the ECM idle state establishes the RRC connection with the E-UTRAN, the UE enters the ECM connected state. ECM The MME in the idle state is connected to the ECM when it makes an S1 connection with the E-UTRAN. When the UE is in the ECM idle state, the E-UTRAN has no context of the UE. Therefore, the terminal in the ECM idle state performs terminal-based mobility-related procedures such as cell selection or cell re-selection procedure without receiving commands from the network. On the other hand, when the terminal is in the ECM connection state, the mobility of the terminal is managed by a command of the network. If the position of the terminal differs from the position known to the network in the ECM idle state, the terminal informs the network of the corresponding position of the terminal through a TA update (Tracking Area Update) procedure.

5 is a diagram illustrating a structure of a dual mode terminal of the present invention.

5, a dual mode terminal may include an application processor and an LTE processor for processing signals received from the LTE network and a WCDMA processor for processing signals received from the WCDMA network.

The application processor may be configured as a single hardware module in the dual mode terminal, or may be included in the PC and configured independently of the dual mode terminal. In addition, the application processor may include a connection manager (CM) for managing and controlling the connection status to the WCDMA network or the LTE network depending on the network environment.

More specifically, the CM performs a switching function for transmitting and receiving data between the application and one of the two processors (WCDMA processor or LTE processor) according to the network connection state. That is, when the dual mode terminal is connected to the WCDMA network, the application data is transmitted / received through the A interface so that the application data is connected to the WCDMA processor and the application. When the dual mode terminal is connected to the LTE network, The application sends and receives to the B interface to be connected.

The host interface is located between the WCDMA processor and the LTE processor and can be used for transmission of control signals and data signals between the processors.

In a dual mode terminal, it is necessary to switch between a network connecting to any one network and a network connecting to another network. This is because, depending on the type of the network to be connected, the transmission / reception speed of data may vary, and if an area is not connected to any one network, the other network must be connected.

If the transmission / reception speed of data is different for each network, the dual mode terminal can set a network having a faster data transmission / reception speed to the priority network. In general, LTE networks can transmit and receive data faster than WCDMA networks. Therefore, CM prefer to connect to LTE network over WCDMA network. Therefore, the CM can use the LTE network when the WCDMA network and the LTE network are mixed. That is, even when the mobile terminal is connected to the WCDMA network, the CM periodically searches for the LTE network and switches the connection to the retrieved LTE network.

A base station for connecting to a network may have a limitation on the distance or there may be a limitation on a geographical space, so that connection to any one of the networks may not be possible. In this case, it is necessary to connect to another network, and therefore, it is necessary to switch to a network which can be connected.

6 and 7 illustrate switching between the WCDMA network and the LTE network, which will be described later.

In general, when the dual-mode terminal is connected through any one of the networks, an operation mode that can be operated is an activated mode or an idle mode. The active mode means an operation mode when data is transmitted and received through a connected network. The idle mode refers to a dormant operation mode since data is not transmitted and received although it is connected to the network.

Since the switching between the networks may vary depending on the operation mode in which the dual mode terminal is operated, the operation modes will be described separately in FIG. 6 and FIG.

6 is a diagram illustrating a case where a dual mode terminal is switched between networks when operating in an idle mode.

6A shows a case where the dual mode terminal 100 is connected to the WCDMA network and FIG. 6B shows a case where the dual mode terminal 100 is connected to the LTE network.

As shown in FIG. 6, when the operation mode of the dual mode terminal 100 is the idle mode, it is possible to switch the network connection from the WCDMA network to the LTE network and conversely from the LTE network to the WCDMA network. That is, when the operation mode is the idle mode, the dual mode terminal 100 can switch the connection in consideration of the wireless environment of the network regardless of the type of the currently connected network.

7 is a diagram illustrating a case where a dual mode terminal is switched between networks when operating in an activated mode.

7A shows a case where the dual mode terminal 100 is connected to a WCDMA network and FIG. 7B shows a case where the dual mode terminal 100 is connected to the LTE network Respectively.

As shown in FIG. 7, in the active mode in which data is being transmitted and received, it is only possible to switch from the LTE network to the WCDMA network. It is impossible to switch to the LTE network in the active mode in which data is being transmitted and received while being connected to the WCDMA network.

The reason why the dual mode terminal operating in the active mode can not switch the connection from the WCDMA network to the LTE network is that the infrastructure must be established on the network side in such a case. That is, more equipment is needed to support such a transition.

However, when the dual mode terminal operating in the active mode is connected to the WCDMA network to transmit and receive data, it is necessary to switch to the LTE network, which is a higher priority network. This is because the LTE network can transmit and receive data faster than the WCDMA network as described above.

In particular, such a switch may be required in a dual mode terminal operating in a CSFB (Cicuit Switched FallBack) scheme. This is because the CSFB format dual mode terminal converts voice signals to and from the LTE network into a more subordinate network, the WCDMA network or the CDMA network.

For example, a user of a dual-mode terminal may use a video streaming service using Youtube. When a voice call is transmitted or received during data transmission or reception to use a video streaming service, the dual mode terminal switches to a connection to a WCDMA network. As described with reference to FIG. 7, the dual mode terminal operating in the active mode is also capable of switching from the LTE network to the WCDMA network.

However, after the end of the voice call, the dual mode terminal remains in the WCDMA network, which is a subordinate network, even though the video streaming service continues. This is because, as described with reference to FIG. 7, the operation mode is not switched from the WCDMA network to the LTE network in the active mode.

Therefore, in the embodiment of the present invention, it is proposed to forcibly switch to the idle mode so that the dual mode terminal operating in the active mode can switch from the WCDMA network to the LTE network. This embodiment will be described in more detail with reference to the flowcharts of FIGS. 8 and 9. FIG.

8 is a diagram illustrating an example of a method for switching a connection from a WCMA network to an LTE network, in accordance with an embodiment of the present invention.

9 is a flow diagram of a method for switching a connection from a WCMA network to an LTE network, in accordance with an embodiment of the invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawing of Fig. 8 and the flowchart of Fig.

Referring to FIG. 8 (a), a dual mode terminal transmits and receives data through a WCDMA network. That is, the dual mode terminal accesses the WCDMA network (step S901), and transmits / receives data through the WCDMA network (step S902).

If the LTE network is searched during data transmission / reception through the WCDMA network according to an embodiment of the present invention, the dual mode terminal suspends transmission / reception of data and switches the operation mode to the idle mode (steps S903 to S906) .

In the dual mode terminal searching for the LTE network, it is possible to use SIB 19 (System Information Block 19) received from the base station of the WCDMA network. SIB 19 is described in detail in the 3GPP standard 25.331 UMTS RRC.

The SIB 19 received from the base station of the presently connected WCDMA network includes information on LTE cells connectable to the periphery. Table 1 below is the contents of 10.2.48.8.22 of 3GPP standard 25.311 UMTS RRC and shows an example of SIB 19 actually received.

Information Element / Group name Need Multi Type and reference Semantics description Version UTRA priority info list MP UTRA priority info list 10.3.7.113 REL-8 GSM priority info list OP GSM priority info list 10.3.7.114 REL-8 E- UTRA frequency and priority  info list OP E-UTRA frequency and priority info list 10.3.7.115 REL-8

SIB 19 contains the frequency and / or priority information of the UTRA, GSM and / or E-UTRA (LTE) network that can be accessed at the current location as shown in Table 1. The priority information is a value set by the network operator. As described above, the higher the data transmission capability, the higher the priority can be. That is, they can have higher priority in the order GSM, UTRA, E-UTRA.

Among them, "E-UTRA frequency and priority info list" is information related to the LTE network. Therefore, the dual mode terminal according to the embodiment of the present invention can check whether there is the " E-UTRA frequency and priority info list ", and search the LTE cell based on this information.

If the LTE network is searched, the dual mode terminal stops sending and receiving data as shown in FIG. 8B and is ready to switch the network (S903).

Subsequently, in order to switch to the LTE network, the dual mode terminal switches the operation mode to the idle mode as shown in FIG. 8C (steps S904 to S906). To switch the operation mode to the idle mode, follow steps S904 and S905.

In step 904, the dual mode terminal transmits an idle operation request signal to the base station. In a WCDMA network, this idle operation request signal may be a Signaling Connection Release Indication (SCRI) message.

The signaling connection release instruction message is a signal that the terminal itself connected to the WCDMA network requests switching to the idle mode. The base station receiving this signal transmits a response signal for permitting the switching to the idle mode to the dual mode terminal. This response signal may be an "RRC connection Release Message" in the WCDMA network.

In step 905, when the dual mode terminal receives the response signal from the base station, the dual mode terminal proceeds to step S906. In step S906, the operation mode of the terminal is switched to the idle mode.

The dual mode terminal entering the idle mode attempts to connect to the searched LTE cell as shown in FIG. 8D (step S907). In the case where the dual mode terminal attempts to connect to the LTE cell and succeeds, the dual mode terminal resumes transmission and reception of data suspended in step S903 (step S908).

On the other hand, if the dual mode terminal fails to receive a response to the signaling connection release instruction message in step 905, the flow proceeds to step S910. That is, if a response to the signaling connection release indication message is not received, the dual mode terminal can not switch to the idle mode, so the connection of the WCDMA network is maintained and transmission / reception of the suspended data is resumed.

Meanwhile, as in the embodiment of the present invention, the transition from the WCDMA network to the LTE network includes steps S911 and S912 to be performed periodically. That is, the dual mode terminal has the period T value, and if the time T elapses, the dual mode terminal returns to step S903 to stop transmitting / receiving data (step S912). However, if an attempt is made to connect to an LTE network and it continues to fail, there is a need to adjust the frequency at which the connection is attempted. This is because the transmission and reception of data are temporarily stopped until the step S903 to S910, so that the user can not provide continuity of data transmission and reception.

Therefore, in order to minimize the discontinuity of data transmission / reception, the value of period T is adjusted in step S911.

That is, if an attempt is made to connect to the LTE network but fails, the value of T can be increased. For example, it can be increased by adding a predetermined value to the period T every time it fails to increase. However, there is no limitation on the method of increasing the period T, so that the embodiment is not limited to the specific method.

On the other hand, if it is tried to connect to the LTE cell in step S907 but fails, the dual mode terminal proceeds to step S909. In step S909, the dual mode terminal returns the connection to the WCDMA network. This is because, in step S907, the mobile station has disconnected from the WCDMA network connected to attempt to access the LTE cell. In particular, in an embodiment of the present invention, upon returning to the connection to the WCDMA network, it may return to the base station (or cell) with the most recently connected history.

The dual mode terminal returned to the WCDMA network in step S909 proceeds to step S910. Then, the process may return to step S903 through steps S910 to S912 as described above.

According to the above description, in the active mode of transmitting and receiving data in the WCDMA network, it is impossible to switch to the LTE network until data transmission / reception is completed. However, according to an exemplary embodiment of the present invention, even in a dual mode terminal operating in an active mode and connected to a WCDMA network, it temporarily switches to the idle mode and tries to connect to the LTE network in a switched state , The dual-mode terminal can be utilized more efficiently.

10 illustrates a block diagram of a terminal device according to an embodiment of the present invention.

10, a terminal apparatus 1000 includes a processor 1010, a memory 1020, an RF module 1030, a display module 1040, and a user interface module 1050. The terminal device 1000 is shown for the convenience of explanation, and some modules may be omitted. In addition, the terminal device 1000 may further include necessary modules. In addition, some modules in the terminal device 1000 can be divided into more detailed modules. The processor 1010 may separately include an LTE processor for communicating with the LTE network and a WCDMA processor for communicating with the WCDMA network and is configured to perform operations according to the embodiments of the present invention described above.

The memory 1020 is connected to the processor 1010 and stores an operating system, an application, a program code, data, and the like. The RF module 1030 is connected to the processor 1010 and performs a function of converting a baseband signal into a radio signal or a radio signal into a baseband signal. To this end, the RF module 1030 performs analog conversion, amplification, filtering, and frequency up conversion, or vice versa. Display module 1040 is coupled to processor 1010 and displays various information. The display module 1040 may use well known elements such as, but not limited to, a Liquid Crystal Display (LCD), a Light Emitting Diode (LED), and an Organic Light Emitting Diode (OLED). The user interface module 1050 is connected to the processor 1010 and may be configured as a combination of well known user interfaces such as a keypad, a touch screen, and the like.

The embodiments described above are those in which the elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

In this document, the embodiments of the present invention have been mainly described with reference to the data transmission / reception relationship between the terminal and the base station. The specific operation described herein as being performed by the base station may be performed by its upper node, in some cases. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like. In addition, the terminal may be replaced by terms such as a UE (User Equipment), a Mobile Station (MS), and a Mobile Subscriber Station (MSS).

Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) field programmable gate arrays, processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, a procedure, a function, or the like which performs the functions or operations described above. The software code can be stored in a memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various well-known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit of the invention. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (10)

A dual mode terminal operating in a wireless communication system including a first network and a second network that is a more senior network than the first network,
A first wireless communication module for communicating with the first network;
A second wireless communication module for communicating with the second network; And
And a processor for processing the signal received from the first network and the signal received from the second network,
Wherein when the processor is transmitting and receiving data through the first network,
The transmission / reception of the data is stopped,
The dual mode terminal changes the operation mode of the dual mode terminal to the idle mode,
And attempting to connect to the second network. 2. The apparatus of claim 1,
Further transmitting an idle operation request signal to a base station of the first network,
Further receiving a response to the idle operation request signal from the base station,
And switches the operation mode to the idle mode in response to the received response. 3. The method of claim 2, wherein the idle operation request signal
A dual mode terminal that is a Signaling Connection Release Indication (SCRI) message. 3. The apparatus of claim 2, wherein the processor, in attempting to connect to the second network,
And transmitting a TAU (Tracking Area Update) message to the base station in the idle mode. 2. The apparatus of claim 1,
When the mobile terminal is connected to the second network, switches the operation mode back to a connected mode and resumes transmission / reception of the suspended data. The method according to claim 1,
Wherein the first network is one of a Wideband Code Division Multiple Access (WCDMA) or a Code Divisional Multiple Access (CDMA). The method according to claim 1,
Wherein the second network is an LTE (Long Term Evolution) network. 2. The apparatus of claim 1,
Receiving information about a cell of the second network from a base station of the first network,
And attempting to connect to the second network based on information about the received cell. The dual mode terminal of claim 8, wherein the information about the cell of the second network is SIB 19 (System Information Block 19) received from the base station. A method for controlling a dual mode terminal operating in a wireless communication system including a first network and a second network that is a higher priority network than the first network,
Transmitting and receiving data through the first network;
Stopping transmission / reception of the data;
Switching an operation mode of the dual mode terminal to an idle mode; And
And attempting to connect to the second network.

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