KR20140022685A - Method and apparatus for interworking network - Google Patents

Abstract

A terminal for interworking of heterogeneous networks and an interworking method using the same are disclosed. Provided is a communication terminal comprising: a first network communication unit which blocks a connection to a second network based on a blocking request signal if the blocking request signal on a second network is inputted, and performs a voice communication or a low speed data communication while being connected to a first network; a signal measurement unit which measures a first signal strength of the first network and a second signal strength of the second network to generate a measurement signal if receiving a connection request signal to the second network while being connected to the first network; a signal determination unit which determines whether a connection to the second network is available or not by comparing the measurement signal with a predetermined reference value; and a second network communication unit which is connected to the second network and performs a high speed data communication if the signal determination unit determines that the connection to the second network is available.

Description

Terminal and interworking method for interworking heterogeneous networks {Method and Apparatus for Interworking Network}

The present embodiment relates to a terminal for interworking heterogeneous networks and a method using the same. More specifically, in changing the connection from the 3G network to the 4G network, the communication terminal measures the signal strengths of the 3G network and the 4G network without performing a location registration procedure to the 3G network to check and connect to the accessible network. The present invention relates to a terminal for interworking heterogeneous networks and a method using the same.

The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.

In general, a wireless communication system is a system developed to be able to perform communication without restriction of location to a user. Such a wireless communication system has been developed from a simple form of providing only a simple voice communication service to providing a high speed data service and a voice service using a packet (VoIP).

In addition, the wireless communication system is developing from a network type system that provides basic voice service and a relatively low data rate service to a system that provides a high speed packet data service. As such, networks providing voice services and relatively low-speed data services in wireless communication systems include 2nd generation (hereinafter referred to as "2G") networks and 3rd generation (hereinafter referred to as "3G") networks. . Although 3G networks can provide relatively high-speed data services, users need to be more advanced than 2G or 3G networks because they want to receive higher-speed data services, so Long Term Evolution (“4G”) is needed. The network is being developed.

On the other hand, since a wireless communication system needs to secure user mobility, a plurality of base stations are often provided to provide a service. Therefore, 2G or 3G network and 4G network are used interchangeably. When a user requests access to a 4G network using a 2G or 3G network using a communication terminal, a PS (Packet Switched) location registration is performed on the 2G or 3G network. When the location registration is completed, it is determined whether the area is a 4G network and connected to the base station. Thus, the time required for using 4G data communication is excessively consumed.

The present embodiment provides a terminal for heterogeneous network interworking, and a method using the same, in which a communication terminal checks and connects to an accessible network by measuring signal strengths of 3G and 4G networks without performing a location registration procedure on the 3G network. There is a main purpose.

According to an aspect of the present embodiment, in a communication terminal for performing communication via a first network and a second network in a wireless communication system, when a block request signal for the second network is input, the block request signal is based on the block request signal. A first network communication unit which disconnects the second network and is connected to the first network to perform voice communication or low speed data communication; When the connection request signal with the second network is received while being connected to the first network, a measurement signal is generated by measuring the first signal strength of the first network and the second signal strength of the second network. A signal measuring unit; A signal determination unit which determines whether or not it is connectable to the second network by comparing the measurement signal with a predetermined reference value; And a second network communication unit configured to connect to the second network and perform high speed data communication when the signal determination unit determines that the second network is connectable to the second network.

According to another aspect of the present invention, in the interworking of the first network and the second network in a wireless communication system, receiving a block request signal for receiving a block request signal for the second network; A first network communication process of disconnecting the connection with the second network based on the blocking request signal and connecting to the first network to perform voice communication or low speed data communication; When receiving a connection request signal for the second network, a measurement signal is generated by measuring a first signal strength for the first network and a second signal strength for the second network using a predetermined system information block. Generating a measurement signal; A location registration process of performing location registration by transmitting terminal location information to the second network when the second network is accessible based on the measurement signal; And a high speed data communication process connected to a neighboring base station included in the second network based on the location registration to transmit and receive content using high speed data communication. to provide.

As described above, according to the present embodiment, when the communication terminal changes the connection from the 3G network to the 4G network, the 4G is measured by measuring the signal strength of the 3G network and the 4G network without performing a location registration procedure on the 3G network. It is possible to shorten the time consumed since the network can be accessed by checking whether the network is accessible. In addition, when switching to a 4G network, the battery consumption is reduced, and a fast connection has the effect of improving call quality and reducing customer complaints.

1 is a block diagram schematically showing a wireless communication system according to the present embodiment;
2 is a block diagram schematically illustrating a network according to the present embodiment;
3 is a block diagram schematically showing a communication terminal according to the present embodiment;
4 is a flowchart illustrating a method in which a communication terminal interworkes a network in a wireless communication system according to the present embodiment;
5 is an exemplary view illustrating a test result of a difference between a network interworking method and a general network interworking method according to the present embodiment.

Hereinafter, the present embodiment will be described in detail with reference to the accompanying drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

1 is a block diagram schematically illustrating a wireless communication system according to the present embodiment.

The wireless communication system according to the present embodiment includes a communication terminal 110, a network 120, and a content providing device 130. Here, the network 120 includes a first network 122, a second network 124, and an n-th network 126.

The communication terminal 110 refers to a terminal capable of transmitting and receiving voice and various data via the network 120 according to a user's key operation or command. A tablet PC, a tablet PC, a laptop, a personal computer It may be one of: a personal computer, a smart phone, a personal digital assistant (PDA), a mobile communication terminal, and the like. In addition, the communication terminal 110 may be a cloud computing terminal that supports cloud computing (Cloud Computing) that can use services such as reading and writing and storing data, using a network, and using content through the network 120.

The communication terminal 110 includes a memory for storing a program or a protocol for communicating with the content providing device 130 or an external terminal via the network 120, a microprocessor for executing and controlling the corresponding program, and the like. Doing. Such a communication terminal 110 may include a plurality of communication modules to perform voice or data communication through a specific network 122, 124, and 126 in the network 120, and may specify a specific network 122, 124. And 126) to communicate with the content providing device 130 or an external terminal. Here, the external terminal is preferably a terminal capable of performing voice communication with the communication terminal 110 via the network 120.

The communication terminal 110 according to the present embodiment communicates using a specific network 122, 124, or 126 corresponding to the network selection menu information input through a user's manipulation. Here, the network selection menu information includes at least one mode, for example, a mode using only the first network 122 and a mode using a mixture of the first network 122 and the second network 124. Here, the mode using only the first network 122 is preferably a CS (Circuit Switched) Only Mode, and the mode using a mixed use of the first network 122 and the second network 124 is CS + PS (Packet Switched). ) Mode is preferred, but is not necessarily limited thereto.

When the communication terminal 110 receives a block request signal for the second network 124 input through a user's manipulation, the communication terminal 110 blocks the connection with the second network 124 and connects with the first network 122 to perform voice communication. Use Here, the communication terminal 110 is described as being connected to the first network 122 to use only voice communication, but is not necessarily limited thereto, and data communication at a lower speed than that provided by the second network 124 is also possible. Do. The communication terminal 110 is a system information block (SIB) that is a broadcast message generated in the first network 122 and the second network 124 even when only the first network 122 is connected. Check.

Here, the system information block includes at least one of the minimum level reception sensitivity (Qrxlevmin), the lowest threshold transmission value (threshServingLow), the minimum threshold value (X) value (ThreshXlow), and the EUTRA minimum level reception sensitivity (QrxlevminEUTRA) specified in the type in the system information block. Contains one or more pieces of information. The system information block is information described in the standard (3GPP TS 25.331), and the minimum level reception sensitivity (Qrxlevmin) is included in the system information block type (TYPE) 3, and the minimum threshold transmission value (threshServingLow) and the lowest threshold value (X) ( ThreshXlow) and EUTRA minimum level reception sensitivity (QrxlevminEUTRA) are included in the system information block type (TYPE) 19.

Meanwhile, when the communication terminal 110 receives a connection request signal for the second network 124 input through a user's operation while connected to the first network 122, the communication terminal 110 uses the first network using a predetermined function. The first signal strength for 122 and the second signal strength for the second network 124 are measured to generate a measurement signal. Here, the first signal strength is a Received Signal Code Power (RSCP) of the 3G network, the second signal strength is preferably a Reference Signal Received Power (RSRP) of the 4G network, but is not necessarily limited thereto.

If the communication terminal 110 compares the measurement signal with a predetermined reference value and determines that the second network 124 is accessible, the communication terminal 110 registers a location with the second network 124 and performs content registration through the second network 124. Data communication for transmitting and receiving content with the providing device 130 is performed. On the other hand, if it is determined that the communication terminal 110 is unable to connect to the second network 124 by comparing the measurement signal to a predetermined reference value, the communication terminal 110 performs location registration on the first network 122, and the first network 122. Stay connected.

The network 120 refers to a communication network capable of transmitting and receiving voice and data using various communication protocols including the first network 122, the second network 124, and the n-th network 126. Here, the first network 122 is preferably a 3G network, the second network 124 is preferably a 4G network, and the n-th network 126 is a synchronous network, an internet network, an intranet network, Network, such as a satellite communications network.

The network 120 may include a cloud computing network capable of interworking with the content providing apparatus 130 to store computing resources such as hardware and software, and providing computing resources required by the client to the corresponding communication terminal 110. Can be. Here, cloud computing refers to a computer environment in which information is permanently stored on a server on the Internet and temporarily stored in a client terminal such as a desktop, a tablet computer, a notebook, a netbook, or a smart phone. Cloud computing, Refers to a computer environment access network that stores information on a server on the Internet and makes the information available anytime and anywhere through various IT devices.

The content providing device 130 refers to a kind of server that stores and manages content for transmitting or receiving data of the communication terminal 110. The content providing device 130 according to the present embodiment preferably transmits corresponding data when the communication terminal 110 is connected to the second network 124 and requests data, but is not necessarily limited thereto. The content corresponding to the request signal received through the specific network 122, 124, and 126 in the C 1) may be transmitted to the communication terminal 110 via the network 120. Here, the content may include at least one of text data, image data, and image data. In addition, the content providing device 130 has the same configuration as a conventional web server or network server in hardware. In addition, software modules include program modules implemented in any language such as C, C ++, Java, Visual Basic, and Visual C. The content providing device 130 may be implemented in the form of a web server or a network server. The web server is generally connected to an unspecified client and / or another server through an open computer network such as the Internet, and the client or other web. It refers to a computer system that receives a server's task execution request and derives and provides a work result thereof, and a computer software (web server program) installed therefor.

2 is a block diagram schematically illustrating a network according to the present embodiment.

As shown in FIG. 2, the network 120 according to the present embodiment includes a first network 122 and a second network 124.

The first network 122 includes a first transmitter 210, a data processor 212, a data gateway 214, and a first charging gateway 216.

UTRAN, which interworks with the first network 122, refers to a Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network, and GERAN refers to a Global System for Mobile communications (GSM) Enhanced Data Rates for GSM Evolution (EDGE) Radio Access Network. UTRAN and GERAN are included in the first network 122.

Since the communication terminal 110 supports both the first network 122 and the second network 124, in the first network 122, the communication terminal 110 communicates with the UTRAN through the Uu interface, and through the Um interface. Communicate with GERAN. The UTRAN communicates with the data processor 212 via the Iu-ps interface and with the exchange 230 via the Iu-cs interface. The GERAN communicates with the data processor 212 via the Gb interface and with the exchange 230 via the A interface. Since the communication terminal 110 supports both the first network 122 and the second network 124, the data processor 212 communicates with the data gateway 214 through the Gn interface, and the exchange 230 through the Gs interface. Communicate with

The first transmitter 210 refers to a transmitter in the first network 122. The first transmitter 210 performs various functions required for radio call processing, such as location registration, wireless channel allocation, and handoff, in the first network 122, The transmitter 210 receives a call request signal from the communication terminal 110 through a signal channel, performs baseband signal processing, wired / wireless conversion, and transmission and reception of a wireless signal. In addition, the first transmitter 210 may receive a data request signal from the communication terminal 110 through a signal channel, and transmit the received data request signal to the content providing device 130 through a transmission controller. Here, the first transmitter 210 is preferably a node B, but is not limited thereto.

The data processor 212 transmits a data packet to the mobile communication terminal 110, generates call history information and charging data for the data packet transmitted to the communication terminal 110, and transmits the data packet to the first charging gateway 216. It performs the function. Here, the data processor 212 may be implemented as a Support GPRS Serving Node (SGSN).

The data gateway 214 is a node in charge of the connection function between the backbone network and the external packet data network. The data gateway 214 converts the packet data received from the data processor 212 into an appropriate packet data protocol (PDP) format (eg, IP, X.25). It converts and transmits the packet data protocol (PDP) address of the incoming packet data to the global mobile communication system (GSM) address of the receiver. The data gateway 214 also stores the address and user profile of the current user's data processor in the location register of the data processor 212 and performs authentication and charging functions. The data gateway 214 is preferably a gateway GPRS support node (GGSN), but is not limited thereto.

The first billing gateway 216 collects call history information and billing data for each data packet received by the subscriber's communication terminal 110 while moving from a plurality of different data processors 212, and the call history information is collected. It checks and generates integrated billing data by integrating billing data with the same billing ID into one data and transmits the billing data to the billing center. In addition, the first charging gateway 216 collects data packet amounts of all charging data having the same charging ID and generates integrated charging data. In addition, the first billing gateway 216 collects respective call history information and billing data from at least one data processor of the plurality of data processors 212 according to the handover of the communication terminal 110. In addition, the first billing gateway 216 performs a function of generating integrated billing data using an identifier (IMSI: International Mobile Subscriber Identity) and a billing ID of call history information. Meanwhile, the billing ID refers to a value assigned by the data gateway 214 when the billing data is generated by the communication terminal 110 in the data processor 212. That is, the billing ID is a value that does not change even when the same subscriber moves the plurality of data processors 212 in the same data gateway 214.

When the communication terminal 110 receives the content from the content providing apparatus 130, the first charging gateway 216 updates the content usage information and charges the required cost of the communication terminal 110 based on the updated information. Collect the results.

The second network 124 is described below. The second network 124 includes a second transmitter 220, a control processor 222, a traffic processor 224, a packet processor 226, and a second charging gateway 228.

The E-UTRAN connected with the second network 124 shown in FIG. 2 refers to the Evolved-UTRAN. The E-UTRAN may be included in the second network 124. Since the communication terminal 110 supports both the first network 122 and the second network 124, the communication terminal 110 communicates with the E-UTRAN through the LTE-Uu interface in the second network 124, and the E The UTRAN communicates with the control processor 222 via the S1-U interface.

e Node B is a device that supports Long Term Evolution (LTE), and functions as RF transmission, transmission / reception, signal strength, quality measurement, baseband signal processing, and channel card (channel card resource management) . The second transmitter 220 and the Evolved Packet Core (EPC) (i.e., the control processing unit 222, the traffic processing unit 224, and the packet processing unit 226) may be collectively referred to as EPS (Evolved Packet System). That is, the second transmitter 220 refers to a transmitter in the LTE network, which is the second network 124. The second transmitter 220 provides various functions required for wireless call processing such as location registration, wireless channel allocation, and handoff in the second network 124. To perform. Here, the second transmitter 220 is preferably an eNode B, but is not limited thereto. In addition, the second transmitter 220 receives a high speed data request signal from the communication terminal 110 through a signal channel in the second network 124, performs baseband signal processing, wired / wireless conversion, and transmission and reception of a wireless signal. Device. The second transmitter 220 may receive a high speed data request signal from the communication terminal 110 through a signal channel and transmit the received high speed data request signal to the content providing apparatus 130 through a transmission controller. Here, the second transmitter 220 is preferably a transmitter, but is not limited thereto, and can be extended to an E-UTRAN.

A control processor 222, a traffic processor 224, and a packet processor 226, and may be referred to as a packet core. This packet core refers to EPC. The control processing unit 222 basically handles call control such as location registration, paging, and authentication for the communication terminal 110, and manages mobility such as a legal interception function and a data call control function for the call controller. It performs a function that performs management. Here, the control processor 222 is preferably an MME (Mobile Management Entity), but is not limited thereto. In addition, the control processor 222 is a node that manages subscriber information and mobility of the communication terminal 110, and is responsible for session management, idle subscriber management, paging, and subscriber authentication functions.

The traffic processing unit 224 is preferably an S-GW (Serving Gateway), but is not limited thereto. That is, the traffic processing unit 224 is a gateway to the access network and manages mobility in the first network 122. In addition, the traffic processor 224 processes legitimate eavesdropping on call traffic, and performs a traffic processing function. The traffic processor 224 is a session controller for processing payload traffic according to a set session and a user plane node for interworking with a second transmitter 220 as a user plane node, Supports handover, sets a packet processing unit 226 and a PDP context, and delivers PDU (Packet Data Unit) using tunneling. On the other hand, the traffic processing unit 224 and the control processing unit 222 can be flexibly expanded according to the increase of the traffic or the increase of the control signal.

The packet processing unit 226 is preferably a P-GW (PDN Gateway), but is not limited thereto. The packet processing unit 226 is a gateway to a PDS (Packet Data Network) such as an IP Multimedia Subsystem (IMS) and the Internet, manages mobility for a non-3GPP network, performs billing according to policy, . In addition, the packet processor 226 allocates the IP of the communication terminal 110 and is a session control and a user plan that interoperates with an external Internet network and a Non-3GPP network, and performs routing with the traffic processor 224 and the external network for packet service. It maintains routing information and has tunneling and IP routing functions. In addition, the packet processing unit 226 delivers the PDU to the traffic processing unit 224 and the external network.

The second billing gateway 228 refers to a device for performing content usage information on the content transmitted from the content providing device 130 to the communication terminal 110 and charging accordingly. That is, when the communication terminal 110 receives the content from the content providing apparatus 130, the second charging gateway 228 updates the content usage information and adjusts the required cost of the communication terminal 110 based on the updated information. Collect the billed results.

3 is a block diagram schematically showing a communication terminal according to the present embodiment.

The communication terminal 110 according to the present embodiment includes an input receiving unit 310, a signal measuring unit 330, a signal determining unit 340, a location registration unit 350, a first network communication unit 360, and a second network communication unit ( 370).

The input receiver 310 receives a block request signal and a connection request signal for the second network 124 input through a user's manipulation. In more detail, when the communication terminal 110 is set to a mode using only the first network 122, the input receiving unit 310 receives a block request signal for the second network 124, the communication terminal ( When 110 is set to a mode in which the first network 122 and the second network 124 are mixed, the input receiver 310 receives a connection request signal for the second network 124. Here, the mode using only the first network 122 is preferably a CS (Circuit Switched) Only Mode, and the mode using a mixed use of the first network 122 and the second network 124 is CS + PS mode. Preferred but not necessarily limited thereto.

When the signal measuring unit 330 receives the connection request signal for the second network 124 from the input receiving unit 310, the signal measuring unit 330 uses the first signal strength for the first network 122 and the second network ( The second signal strength of 124 is measured to generate a measurement signal. Here, the first signal strength is a Received Signal Code Power (RSCP) of the 3G network, the second signal strength is preferably a Reference Signal Received Power (RSRP) of the 4G network, but is not necessarily limited thereto.

On the other hand, the signal measuring unit 330 is a broadcast generated from the first network 122 and the second network 124 to measure the first signal strength and the second signal strength even when only the first network 122 is connected. The system information block (SIB), which is a signal, is checked at predetermined intervals. Here, the system information block includes at least one of the minimum level reception sensitivity (Qrxlevmin), the lowest threshold transmission value (threshServingLow), the minimum threshold value (X) value (ThreshXlow), and the EUTRA minimum level reception sensitivity (QrxlevminEUTRA) specified in the type in the system information block. Contains one or more pieces of information. The system information block is information described in the standard patent (TS 25.331), and the minimum level reception sensitivity (Qrxlevmin) is included in the system information block type (TYPE) 3, and the lowest threshold transmission value (threshServingLow) and the lowest threshold value (X) value ( ThreshXlow) and EUTRA minimum level reception sensitivity (QrxlevminEUTRA) are included in the system information block type (TYPE) 19.

Hereinafter, a process for measuring the first signal strength and the second signal strength using the system information block is expressed as an equation.

First, the first signal strength RSCP measured using the system information block is expressed by Equation 1 below.

(RSCP: signal strength in first network, Qrxlevmin: minimum level reception sensitivity, threshServingLow: minimum threshold transmission value)

For example, when the minimum level reception sensitivity is -56 dBm and the minimum threshold transmission value is 30 dBm, the first signal strength is -56 dBm since -116 dBm + 60 dBm according to Equation 1.

In addition, the second signal strength RSRP measured using the system information block is represented by Equation 2.

(RSRP: signal strength in second network, ThreshXlow: lowest threshold (X) value, QrxlevminEUTRA: EUTRA minimum level reception sensitivity)

For example, if the lowest threshold value X is 0 dBm and the EUTRA minimum level reception sensitivity is -53 dBm, the second signal strength is -106 dBm since 0 dBm + -106 dBm according to Equation 2.

The signal determiner 340 determines whether the second network 124 can be connected to the predetermined reference value. Here, the predetermined reference value is preferably a reference value for the first signal strength and the second signal strength, but is not necessarily limited thereto.

If it is determined that the signal determining unit 340 is accessible to the second network 124 in comparison with a predetermined reference value, the location registration unit 350 displays a cell in which the current communication terminal 110 is located in the second network 124. Location registration is performed by sending the location information for. On the other hand, if it is determined that the signal determining unit 340 cannot access the second network 124 compared to a predetermined reference value, the signal determining unit 340 transmits current location information to the first network 122 and disconnects the connection of the first network 122. Keep it.

If the location determining unit 350 determines that the signal determining unit 340 can access the second network 124, the location registration unit 350 registers the location with the second network 124 without performing location registration with the first network 122. do. By omitting the procedure of registering a location with the first network 122, the time for connecting to the second network 124 can be shortened.

When the first network communicator 360 receives a block request signal for the second network 124 from the input receiver 310, the first network communicator 360 disconnects the connection with the second network 124, and connects the voice with the first network 122. Use communication Here, the first network communication unit 360 is described as being connected to the first network 122 to use only voice communication, but is not necessarily limited thereto, and data communication at a lower speed than the second network 124 is possible.

When the second network communication unit 370 performs location registration by transmitting location information on the cell where the communication terminal 110 is located in the second network 124 to the second network 124, the second location around the location registered. It is connected to a network base station and performs data packet communication for transmitting and receiving content with the content providing device 130. Here, data packet communication refers to high speed packet communication of a second network that delivers a packet at a higher speed than communication of the first network.

4 is a flowchart illustrating a method in which a communication terminal interworkes a network in a wireless communication system according to the present embodiment.

The communication terminal 110 receives a block request signal for the second network 124 (S410). Here, the communication terminal 110 is preferably set to a mode using only the first network 122, but is not necessarily limited thereto, and may be a mode for using a voice call.

The communication terminal 110 blocks the connection with the second network 124 based on the block request signal and connects with the first network 122 (S420). Here, the communication terminal 110 is preferably connected to the first network 122 to use only voice communication, but is not necessarily limited thereto, and data communication at a lower speed than the second network 124 is also possible.

The communication terminal 110 checks the system information blocks for the first network 122 and the second network 124 at predetermined intervals even when only the first network 122 is connected (S430). Here, the system information block includes at least one of the minimum level reception sensitivity (Qrxlevmin), the lowest threshold transmission value (threshServingLow), the minimum threshold value (X) value (ThreshXlow), and the EUTRA minimum level reception sensitivity (QrxlevminEUTRA) specified in the type in the system information block. Contains one or more pieces of information. The system information block is information described in the standard patent (TS 25.331), and the minimum level reception sensitivity (Qrxlevmin) is included in the system information block type (TYPE) 3, and the lowest threshold transmission value (threshServingLow) and the lowest threshold value (X) value ( ThreshXlow) and EUTRA minimum level reception sensitivity (QrxlevminEUTRA) are included in the system information block type (TYPE) 19.

When the communication terminal 110 receives a connection request signal for the second network 124 to use data packet communication (S440), the communication terminal 110 substitutes a system information block into a predetermined function according to the connection request signal to the first signal. The measurement signal is generated by measuring the strength and the second signal strength (S450). Here, the first signal strength is a Received Signal Code Power (RSCP) of the 3G network, the second signal strength is preferably a Reference Signal Received Power (RSRP) of the 4G network, but is not necessarily limited thereto. Meanwhile, the communication terminal 110 measures the first signal strength by applying a system information block, which is a broadcast signal generated from the first network 122 and the second network 124, to Equation 1, Apply to measure the second signal strength.

The communication terminal 110 determines whether it is connectable to the second network 124 based on the measurement signal (S460).

As a result of checking in step S460, when the second network 124 is accessible, the communication terminal 110 registers the location with the second network 124 (S470), and the content providing device using the second network 124. Data packet communication with 130 is performed (S490). Here, the communication terminal 110 can shorten the time to be connected to the second network 124 by omitting the procedure of registering the location in the first network (122).

On the other hand, as a result of checking in step S460, if it is impossible to connect to the second network 124, the location registration to the first network 122, and the connection with the first network 122 to perform voice or data communication It is maintained (S480).

In FIG. 4, steps S410 to S490 are described as being sequentially executed. However, this is merely illustrative of the technical idea of an embodiment of the present invention, and the general knowledge in the technical field to which an embodiment of the present invention belongs. Those having a variety of modifications and variations may be applicable by changing the order described in FIG. 4 or executing one or more steps of steps S410 to S490 in parallel without departing from the essential characteristics of an embodiment of the present invention. 4 is not limited to the time series order.

5 is an exemplary view illustrating a test result of a difference between a network interworking method and a general network interworking method according to the present embodiment.

FIG. 5 illustrates a comparison of time to be connected to a 4G network by applying a network interworking method and a general network interworking method according to the present embodiment to the communication terminal 110. For example, "Three * E120S" and "Three * E160S". In the case of changing from 3G network to 4G network by applying a general network interworking method using the communication terminal 110 of two models, "3 * E120S" is 49.8 seconds, "3 * E160S" is 56.4 seconds elapsed Afterwards, the communication terminal 110 performs location registration on the 4G network, and data packet communication is possible through the 4G network.

On the other hand, when using the communication terminal 110 of the two models of "sam * E120S" and "sam * E160S" to change from 3G network to 4G network by applying the network interworking method according to this embodiment, "sam * E120S" "1.3 seconds," "3 * E160S" means that the communication terminal 110 performs location registration to the 4G network after the time of 1.3 seconds has elapsed, thereby reducing the time for the communication terminal 110 to access the 4G network to reduce the 4G network. Can be connected to perform data packet communication.

The foregoing description is merely illustrative of the technical idea of the present embodiment, and various modifications and changes may be made to those skilled in the art without departing from the essential characteristics of the embodiments. Therefore, the present embodiments are to be construed as illustrative rather than restrictive, and the scope of the technical idea of the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

As described above, the present embodiment is applied to the field, and it is possible to directly connect by checking whether the 4G network is accessible, thereby reducing the time consumed and reducing the battery consumption when converting to the 4G network. It is a useful invention that produces an effect that can improve the call quality and reduce customer complaints due to the fast connection.

110: communication terminal 120: network
122: first network 124: second network
126: control network 130: content providing apparatus
210: first transmitter 212: data processor
214: data gateway 216: first charging gate
220: second transmitter 222: control processing unit
224: traffic control unit 226: packet processing unit
228: second charging gateway 230: exchange

Claims (11)

In a communication terminal for performing communication via a first network and a second network in a wireless communication system,
When the blocking request signal for the second network is input, the first network disconnects the connection with the second network based on the blocking request signal and is connected to the first network to perform voice communication or low speed data communication. Communication unit;
When the connection request signal with the second network is received while being connected to the first network, a measurement signal is generated by measuring the first signal strength of the first network and the second signal strength of the second network. A signal measuring unit;
A signal determination unit which determines whether or not it is connectable to the second network by comparing the measurement signal with a predetermined reference value; And
A second network communication unit configured to perform high-speed data communication by connecting to the second network when it is determined that the signal determination unit is accessible to the second network.
The communication terminal comprising: The method of claim 1,
The second network communication unit,
A location register which registers a location by transmitting location information on a cell of a current location to the second network; And
A data communication unit connected to a second network base station registered around the location to perform the data packet communication;
The communication terminal comprising: The method of claim 1,
Wherein the signal measuring unit comprises:
The signal measuring unit checks at least one or more pieces of information of a plurality of system information blocks (SIBs) for measuring the first signal strength and the second signal strength in a predetermined period while only the first network is connected. Communication terminal, characterized in that. The method of claim 3, wherein
The plurality of system information blocks,
Includes at least one of the minimum level reception sensitivity (Qrxlevmin), the minimum threshold transmission value (threshServingLow), the minimum threshold value (ThreshXlow), and the EUTRA minimum level reception sensitivity (QrxlevminEUTRA) defined in the type in the system information block. Communication terminal, characterized in that. The method of claim 1,
Wherein the signal measuring unit comprises:
Measuring the first signal strength,

(RSCP: signal strength in first network, Qrxlevmin: minimum level of reception sensitivity, threshServingLow: minimum threshold transmission value)
Apply the equation of,
Measuring the second signal strength,

(RSRP: signal strength in second network, ThreshXlow: lowest threshold (X) value, QrxlevminEUTRA: EUTRA minimum level reception sensitivity)
Communication terminal, characterized in that for applying the equation. The method of claim 1,
And if it is determined by the signal determination unit that connection to the second network is not possible, performing location registration to the first network and maintaining a connection with the first network. The method of claim 1,
The blocking request signal and the connection request signal,
And at least one of a mode using only the first network and a mode using a mixture of the first network and the second network. In interworking a first network and a second network in a wireless communication system,
A blocking request signal receiving step of receiving a blocking request signal for the second network;
A first network communication process of disconnecting the connection with the second network based on the blocking request signal and connecting to the first network to perform voice communication or low speed data communication;
When receiving a connection request signal for the second network, a measurement signal is generated by measuring a first signal strength for the first network and a second signal strength for the second network using a predetermined system information block. Generating a measurement signal;
A location registration process of performing location registration by transmitting terminal location information to the second network when the second network is accessible based on the measurement signal; And
A high speed data communication process connected to a neighbor base station included in the second network based on the location registration and transmitting and receiving contents using high speed data communication;
Network interworking method using a communication terminal comprising a. The method of claim 8,
The first network communication process,
And identifying the predetermined system information block for measuring the first signal strength and the second signal strength at predetermined intervals in the measurement signal generation process. The method of claim 8,
In the measurement signal generation process,
A first network maintenance process of performing a location registration to the first network and maintaining the connection of the first network when it is impossible to access the second network based on the measurement signal;
Network interworking method using a communication terminal comprising a. The method of claim 8,
The location registration process,
And performing the location registration by transmitting the terminal location information corresponding to a cell currently located to the second network without transmitting location information to the first network.

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