KR101472105B1 - Method for preferentially connecting mobile terminal to network and base station for performing the same - Google Patents

Abstract

A network priority access method and a base station apparatus performing the method are disclosed.
In this method, a base station apparatus of a first network capable of providing only a packet service receives a call connection request from a mobile terminal, and a priority of a second network capable of providing a CS (Circuit Switch) Set the network priority to be higher than the priority. Determines a network transition of the mobile station according to the network priority, and transmits a call connection response indicating the transition to the second network to the mobile station.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a network priority access method and a base station apparatus for performing the network priority access method and a base station apparatus for performing the network pre-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network priority access method and a base station apparatus performing the method.

Currently, the UTRAN (UMTS Radio Access Network) supports both Circuit Switch (CS) and Packet Switch (PS) methods. However, LTE (Long Term Evolution) supports voice calls based on IMS (IP Multimedia Subsystem), but most operators do not use IMS at present.

Accordingly, the LTE standard proposes a CS Switched Fallback service to support voice calls.

The CS fallback service is a method of providing a mobile terminal with a non-LTE (Mobile Terminals) call when a Mobile Originate (MO) call or MT (Mobile Terminate) call occurs while the mobile terminal is camping in the LTE network UTRAN and handles the voice call. In other words, LTE is a temporary method of providing voice service through UTRAN before mVoIP becomes full-scale.

In this manner, when a voice call is originated from a mobile terminal camping on the LTE network or a voice call is received, the mobile terminal transits from the LTE network to the UTRAN and is required to receive a voice call service, resulting in an overall call setup delay for the voice call service do.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a network priority access method for reducing a voice call setup delay by first connecting a mobile terminal to a UTRAN over an LTE network and a base station apparatus performing the method.

According to one aspect of the present invention,

Receiving a call connection request from a mobile station by a base station apparatus of a first network capable of providing only a packet service; Setting a network priority such that a priority of a second network capable of providing a CS (Circuit Switch) service is higher than a priority of the first network; Determining a network transition of the mobile station according to the network priority; And transmitting a call connection response indicating a transition to the second network to the mobile terminal.

Here, after the step of transmitting to the mobile terminal, the mobile terminal transitions to the second network according to the call connection response and stays in the second network.

In addition, the setting of the priority may include: requesting a network priority to an MME of the first network according to a call connection request from the mobile terminal, in the eNodeB of the first network; Setting the network priority so that the MME of the first network is higher than the priority of the first network; And the MME of the first network transmitting the network priority to the eNodeB of the first network.

If the network priority is set such that the priority of the second network is higher than the priority of the first network in determining network transition of the mobile station, the network transition of the mobile station is determined .

Receiving a data service call from a mobile terminal where the base station device of the second network resides in the second network; Determining whether the data service call is an outgoing call; Determining a transition of the mobile terminal to the first network if the data service call is an outgoing call; And transmitting the transition information to the first network to the mobile terminal.

The method may further include, after the step of transmitting to the mobile terminal, the mobile terminal transitions to the first network according to the transition information and receives data service through the first network.

After the data service is provided, when the data service is completed, the base station apparatus of the first network transitions the mobile terminal to the second network.

In addition, the step of determining a transition to the first network may include: confirming a transition possibility of the mobile terminal to the first network; And confirming transition information for the mobile terminal to transition to the first network when the possibility of transition to the first network is confirmed.

In addition, in the step of determining whether the data service call is an outgoing call, when the data service call is not an outgoing call, the base station apparatus of the second network provides a data service for the mobile terminal.

According to another aspect of the present invention,

A base station apparatus of a first network capable of providing only a packet service, the base station apparatus comprising: a setting unit configured to set a network priority such that a priority of a second network capable of providing a CS (Circuit Switch) service is higher than a priority of the first network; part; And a call response process for the call connection request to transition the mobile terminal to the second network according to the network priority set by the setting unit when a call connection request is received from the mobile terminal connected to the first network And a call processing unit.

Here, the base station apparatus is an MME (Mobility Management Entity) of the first network, and the call processing unit receives an initial context connection request from the eNodeB of the first network and transmits the established network priority to the eNodeB To the mobile station.

According to another aspect of the present invention,

A base station apparatus of a first network capable of providing a packet service and a circuit switch (CS) service, the base station apparatus receiving a call connection request from a mobile station and transmitting a response thereto, A call processing unit for transmitting a response to the mobile terminal; A direction determiner for determining whether a data service call request received from the mobile terminal through the call processor is an outgoing call; A transition determining unit for making a transition to the second network capable of providing only packet service when the data service call request received from the mobile station is determined to be an outgoing call by the direction determining unit; And a transition information checking unit for transmitting the transition information to the mobile terminal through the call processing unit when the network transition of the mobile station is determined by the transition determining unit.

Here, the transition information verifying unit checks whether or not a transition from the mobile terminal to the second network is possible through the call processing unit, and when it is determined that the transition is possible, the transition information verifying unit confirms the frequency information of the second network, And transmits it to the mobile terminal through the call processing unit 311.

In addition, when it is determined by the direction determination unit that the data service call request received from the mobile terminal is not an outgoing call, the call processing unit processes the data service for the mobile terminal to be performed through the first network .

According to the embodiment of the present invention, since the mobile terminal can preferentially stay in the UTRAN rather than the LTE network, it can be processed immediately in the voice call processing, so that the call setup delay for the voice call service is greatly reduced compared to the conventional case.

Also, when a data service is originated from a mobile terminal staying in the UTRAN, the mobile terminal transitions to a high-speed LTE network and receives data service, thereby enabling high-speed data service for the mobile terminal.

FIG. 1 is a diagram schematically illustrating a mobile communication system to which a CS fallback service providing method according to an embodiment of the present invention is applied.
Figure 2 shows a generic CS fallback procedure.
3 is a flowchart of a general voice call processing method performed between mobile terminals camping on an LTE network.
4 is a flowchart of a network prioritization method according to an embodiment of the present invention.
5 is a diagram illustrating a network priority setting direction in an MME according to an embodiment of the present invention.
6 is a flowchart of a method for providing a data service for a mobile terminal 100 connected to a UTRAN 300 according to a network priority access method according to an embodiment of the present invention.
7 is a diagram illustrating an internal configuration of an MME according to an embodiment of the present invention.
8 is a diagram illustrating an internal configuration of a NodeB according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Hereinafter, a network transition method according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic view of a mobile communication system to which a network transition method according to an embodiment of the present invention is applied.

Referring to FIG. 1, when a user equipment (UE) 100 uses a data service, the user equipment 100 accesses an LTE (Long Term Evolution) network 200 and uses a CS service (for example, (UTRAN) Terrestrial Radio Access Network (CS) circuit switched network when using a Short Message Service (SMS), LoCation Services (LCS), and USSD (Unstructured Supplementary Service Data)

As described above, the mobile communication system is mixed with the LTE network 200 incapable of circuit-switched communication and the UTRAN network 300 such as WCDMA / GSM capable of coping with circuit-switched communication.

Here, the mobile terminal (UE) 100 is a terminal supporting the CS fallback (Circuit Switched Fallback) service.

The CS fallback service is a service in which when an MO (Mobile Originate) call occurs or a MT (Mobile Terminate) call occurs while the mobile terminal 100 in service is camping in the LTE cell in the LTE cell area And hand over the mobile terminal 100 to the UTRAN network 300 to process the CS service call.

The LTE network 200 supports only the packet switching (PS) method and includes an eNodeB 210, an MME (Mobility Management Entity) 230, a Serving Gateway (S-GW) (PDSN) 250, a P-GW (Packet Data Network Gateway) 270, and an Internet network 290.

Here, the eNodeB 210 is a base station apparatus of the LTE radio access network. The eNodeB 210 includes a paging request for CS fallback, a function of delivering an SMS message to the mobile terminal 100, a target cell Direct connection is supported.

The MME 230 supports Combined EPS / IMSI Attach, Combined TA / LA Update, Detach, SMS message processing from the mobile terminal 100 and SGS interface connection management to the MSC 350 as well as CS fallback.

The S-GW 250 acts as a mobile anchor when the mobile terminal 100 moves between handoffs between the eNodeBs 210 or between 3GPP wireless networks.

The P-GW 270 allocates an IP (Internet Protocol) address of the mobile terminal 100, performs packet data related functions of the core network, and acts as a mobile anchor when moving between the 3GPP wireless network and the non-3GPP wireless network do.

The UTRAN CS network 300 supports both circuit switching (CS) and packet switching. The UTRAN CS network 300 includes a Node B 310, an RNC (Radio Network Controller) 330, an MSC A mobile switching center) 350, a Short Message Service Center (SMSC) 370, and a Public Switched Telephone Network (PSTN) 390.

The NodeB 310 and the RNC 330 are radio access networks in the UTRAN CS network 300 and are located in an asynchronous transfer mode (ATM), between the mobile terminal 100 and a wireless communication core network Data and control information.

The MSC 350 supports Combined EPS / IMSI Attach, Combined TA / LA Update, Detach, SMS message processing from the MME 230 as well as CS Fallback Service and SGS interface connection management to the MME.

At this time, for the CS fallback service, a mobility management process such as Combined EPS / IMSI Attach process, Combined TA / LA Update process and Detach process is performed first. Hereinafter, this process is collectively referred to as a location registration process.

On the other hand, the CS fallback process according to the call incoming is shown in FIG.

Figure 2 shows a generic CS fallback procedure.

Referring to FIG. 2, when an outgoing call 1 is received from the O-MSC, the MSC (350 in FIG. 1) transmits a paging request (2) to the MME (230 in FIG. 1) using the SGsAP protocol.

Then, the MME (230 in FIG. 1) receives the paging response 4 from the mobile terminal (100 in FIG. 1) by sending a paging request 3 to the mobile terminal (100 in FIG. 1) connected to the LTE cell, And transmits the handover command 5 to the LTE cell.

Here, although not shown in FIG. 2, a process of providing information (SIB) of the UTRAN target cell to the mobile terminal 100 connected to the LTE cell is performed prior to the paging request (2).

The LTE cell performs a handover and a switch 6 process with the UTRAN cell, and when completed, the MSC (350 in FIG. 1) receives the paging response through the UTRAN cell and performs a call setup process. After that, the mobile terminal 100 uses the voice call service through the UTRAN cell.

3 is a flowchart of a general voice call processing method performed between mobile terminals camping on an LTE network.

It is assumed that both the calling terminal and the called terminal are connected in the LTE network 200 before explanation.

Referring to FIG. 3, if the calling terminal requests CS fallback for voice call to the calling eNodeB (S10), the calling eNodeB forwards the CS fallback request to the calling MME (S11).

Next, the calling MME transmits a CS fallback response to the calling terminal via the calling eNodeB (S12, S13) for instructing a transition to the UTRAN 300 for voice call service for the CS fallback request.

Accordingly, the calling terminal transits to the UTRAN 300 for voice call service (S14), and then makes a voice call request to the calling NodeB of the UTRAN (S15). At this time, the voice call request includes the destination number of the destination terminal to which the voice call is to be received.

Next, the calling NodeB forwards the voice call request to the calling MSC (S16), and the calling MSC requests the HLR (Home Location Register) to confirm the called party's location (S17).

When the HLR confirms the location of the called number and responds the location information to the calling MSC (S18), the calling MSC requests the called MSC to the called MSC corresponding to the location information (S19).

Since the called MSC is located in the LTE network 200, the incoming MSC attempts to page the called terminal using the incoming MME and the SGs interface (S20).

Accordingly, the called MME receives the called terminal paging from the incoming MSC and tries the incoming paging to the called terminal through the incoming eNodeB (S21, S22).

At this time, since the paging is periodically transmitted in a certain period, a delay occurs in setting a call (S23). Typically this period is 2.56 seconds, 1.28 seconds, 0.64 seconds, etc. and can be set by the user.

Then, the called terminal receives paging after a time delay and transmits a CS fallback request to the called MME through the incoming eNodeB (S24, S25). The called MME transits to the UTRAN 300 in response to the CS fallback request, A CS fallback response indicating an instruction to receive a call is transmitted to the called terminal through the eNodeB (S26, S27).

Accordingly, the called terminal transits to the UTRAN 300 for the voice call service (S28), and then transmits a voice response for the incoming paging to the incoming MSC through the incomingNodeB (S29, S30).

Through this procedure, both the calling terminal and the called terminal located in the LTE network 200 can be transited to the UTRAN 300 to receive the voice call service.

As described above, when the mobile terminal 100 connected to the LTE network 200 makes a voice call or receives a voice call, the mobile terminal 100 must perform a CS fallback transition to the UTRAN 300 to receive a voice call, A delay occurs.

Hereinafter, a network priority access method according to an embodiment of the present invention will be described.

4 is a flowchart of a network prioritization method according to an embodiment of the present invention.

Prior to the description, the mobile terminal 100 is a terminal capable of connecting to the heterogeneous network, for example, a terminal that can access both the LTE network 200 and the UTRAN 300. [ In particular, the mobile terminal 100 is an LTE terminal, assuming that the terminal is a terminal requesting a call connection to the base station of the LTE network 200, that is, the eNodeB 210, when the terminal is powered on.

Referring to FIG. 4, when the mobile terminal 100 is powered on (S100), the mobile terminal 100 transmits a call connection request to the eNodeB 210 of the LTE network 200 (S110).

Next, the eNodeB 210 performs an initial context setting procedure with the MME 230 to determine a network where the mobile terminal 100 should stay in response to a call connection request from the mobile terminal 100. [

More specifically, the eNodeB 210 transmits an Initial Context Setup Request to the MME 230 in order to receive the network priority information (S120).

Next, the MME 230 must obtain the network priority information preset for the mobile terminal 100 in response to the request from the eNodeB 210. However, in the embodiment of the present invention, the MME 230 sets the priority for each mobile terminal 100 Instead, it sets the priority for the network. That is, the network priority of the UTRAN 300 is set higher than that of the LTE network 200 (S130). As described above, in the embodiment of the present invention, the priority of the overlaid UTRAN 300 and the LTE network 200 is preset to be high in the UTRAN 300 as shown in FIG. 5, And is connected to the UTRAN 300 as a result.

Accordingly, the MME 230 may transmit the initial context setting response including the network priority information set so that the network priority of the UTRAN 300 is higher than the network priority of the LTE network 200, regardless of the mobile terminal 100, To the eNodeB 210 (S140). At this time, the network priority information may be included in the SPID (Subscriber Profile ID) and transmitted.

Then, the eNodeB 210 determines whether or not the mobile terminal 100 has a network transition based on the network priority information transmitted from the MME 230. In the embodiment of the present invention, since the mobile terminal 100 is connected to the LTE network 200 and the network priority of the UTRAN 300 is high according to the network priority information, the eNodeB 210 transmits A network transition is determined (S150).

Thereafter, the eNodeB 210 transmits a call connection response to the call connection request in the step S100 to the mobile terminal 100, and transmits information indicating a transition to the UTRAN 300 of the mobile terminal 100 (S160). The information for instructing the transition of the mobile terminal to the UTRAN 300 is obvious to those skilled in the art, so a detailed description thereof will be omitted.

Accordingly, the mobile terminal 100 transits to the UTRAN 300 according to an instruction from the eNodeB 210 and camps the UTRAN 300, so that a voice call can be established without a network transition in the voice call service.

In this manner, by allowing the mobile terminal 100 to preferentially access the UTRAN 300 by setting the network priority information, the voice call service is processed through the UTRAN 300 and the call setup delay is reduced.

Meanwhile, according to the embodiment of the present invention, when the mobile terminal 100 is staying in the UTRAN 300, it is possible to provide the data service to the UTRAN 300 except for the LTE network 200 providing the high-speed data service none.

Accordingly, when the mobile terminal 100 requests the data service, the mobile terminal 100 transitions to the LTE network 200 to receive the data service.

This will be described in detail with reference to FIG.

6 is a flowchart of a method for providing a data service for a mobile terminal 100 connected to a UTRAN 300 according to a network priority access method according to an embodiment of the present invention.

Referring to FIG. 6, the mobile terminal 100 transmits an RRC connection request message for call connection to the NodeB 310 of the UTRAN 300 to receive a data service (origination) (S200).

The NodeB 310 determines whether the call is a call originated by the mobile terminal 100 in response to a data service request from the mobile terminal 100 (S210). In the embodiment of the present invention, it is assumed that the mobile terminal 100 originates a call for data service.

The Node B 310 transmits the data service through the LTE network 200 to the mobile terminal 100 in order to receive the data service through the LTE network 200 providing the higher data service than the data service provided by the UTRAN 300, 100 in step S220.

Accordingly, the NodeB 310 transmits an RRC connection setup message to the mobile terminal 100, which is a message for confirming whether the mobile terminal 100 can connect to the LTE network 200 (S230).

Next, the mobile terminal 100 transmits an RRC connection setup complete message including a response to the connection availability to the LTE network 200 to the NodeB 310 (S240). Here, whether or not the mobile terminal 100 can connect to the LTE network 200 can be connected to the LTE network 200 and informs the supported LTE frequency band.

The NodeB 310 transmits an RRC message to the mobile terminal 100 in order to terminate the wireless connection with the mobile terminal 100 and to transition the mobile terminal 100 to the LTE network 200 when the mobile terminal 100 responds to the LTE network 200. [ and transmits a connection Release message to the mobile terminal 100 (S250). In this message, LTE frequency information for transitioning the mobile terminal 100 to the LTE network 200 is included.

Accordingly, the mobile terminal 100 transits to the LTE network 200 through the eNodeB 210 according to an instruction from the NodeB 310 (S260).

When the mobile terminal 100 transitions to the LTE network 200, the eNodeB 210 requests the MME 230 for information of the subscriber of the mobile terminal 100 (S261), and the MME 230 transmits the subscriber information (S263) and provides the subscriber information to the eNodeB (230) through an HSS (Home Subscriber Server) (400). Herein, it is assumed that the subscriber information of the mobile terminal 100 is set to be a terminal in the UTRAN 300 where the mobile terminal 100 is 3G.

Thereafter, the eNodeB 210 provides the high-speed data service to the mobile terminal 100 through the LTE network 200 (S270).

When the mobile terminal 100 finishes using the high-speed data service through the eNodeB 210, the eNodeB 210 transmits the subscriber information provided from the HSS 400 in step S265 to the mobile terminal 100, It is determined that the UE is a terminal staying in the UTRAN 300, and thus a transition to the UTRAN 300 is determined (S275).

Thereafter, a procedure is performed in which the eNodeB 210 transits the mobile terminal 100 back to the UTRAN 300 and causes the UTRAN 300 to stay in the mobile terminal 100 (S280).

Accordingly, the mobile terminal 100 transits to the UTRAN 300 after the high-speed data service through the LTE network 200 and remains in the UTRAN 300, so that the mobile terminal 100 can immediately receive the voice call service.

If it is determined in step S210 that the mobile terminal 100 does not originate a call but an incoming data service involving the transmission of a small packet such as a text message, The corresponding data service is processed to be performed in the NodeB 310 as it is (S300). However, when a button or the like is pressed by the user of the mobile terminal 100 to set up data traffic based on user activation, the mobile terminal 100 transitions to the LTE network 200 for the incoming data service and transmits the service through the LTE network 200 . That is, the transition to the LTE network 200 can also be determined for the incoming data service in step S220.

FIG. 7 is a diagram showing an internal configuration of the MME 230 according to an embodiment of the present invention, and FIG. 7 schematically shows only the configuration related to the embodiment of the present invention.

Referring to FIG. 7, the MME 230 includes a priority setting unit 231 and a call processing unit 233.

The priority setting unit 231 sets the network priority such that the network priority of the UTRAN 300 is higher than the network priority of the LTE network 200.

The call processing unit 231 transmits the network priority information set by the priority setting unit 231 to the eNodeB 210 according to the network priority request from the eNodeB 210. [

FIG. 8 is a diagram illustrating an internal configuration of a NodeB 310 according to an embodiment of the present invention, and FIG. 8 schematically shows a configuration related to an embodiment of the present invention.

Referring to FIG. 8, the NodeB 310 includes a call processing unit 311, a direction determination unit 313, a transition determination unit 315, and a transition information verification unit 317.

The call processing unit 311 receives a call connection request from the mobile terminal 100 and transmits a response to the call connection request. When a network transition of the mobile terminal 100 is required, the call processing unit 311 transmits a response indicating a network transition to the mobile terminal 100 do.

The direction determination unit 313 determines whether the data service call request received from the mobile terminal 100 through the call processing unit 311 is an outgoing call.

The transition determining unit 315 determines the network transition to the LTE network 200 of the mobile terminal 100 if the direction determining unit 313 determines that the data service call request received from the mobile terminal 100 is an outgoing call .

The transition information verifying unit 317 verifies whether the mobile terminal 100 can access the LTE network 200 through the call processing unit 311 when the transition of the mobile terminal 100 is determined by the transition determining unit 315 And when it is determined that it is possible, the mobile terminal 100 confirms the frequency information of the transitionable LTE network 200 and transmits the frequency information to the mobile terminal 100 through the call processing unit 311.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (16)

Receiving a call connection request from a mobile station by a base station apparatus of a first network capable of providing only a packet service;
Setting a network priority such that a priority of a second network capable of providing a CS (Circuit Switch) service is higher than a priority of the first network;
Determining a network transition of the mobile station according to the network priority; And
Transmitting a call connection response indicating a transition to the second network to the mobile terminal
To the network. The method according to claim 1,
After the step of transmitting to the mobile terminal,
Further comprising the step of the network transitioning to the second network according to the call connection response and staying in the second network. The method according to claim 1,
Wherein the setting of the priority comprises:
The eNodeB of the first network requesting a network priority to a Mobility Management Entity (MME) of the first network according to a call connection request from the mobile terminal;
Setting the network priority so that the MME of the first network is higher than the priority of the first network; And
Wherein the MME of the first network transmits the network priority to the eNodeB of the first network
To the network. The method of claim 3,
The network transition of the mobile station is determined when the network priority is set such that the priority of the second network is higher than the priority of the first network in the step of determining the network transition of the mobile station To the network. 3. The method of claim 2,
The base station device of the second network receiving a data service call from a mobile terminal residing in the second network;
Determining whether the data service call is an outgoing call;
Determining a transition of the mobile terminal to the first network if the data service call is an outgoing call; And
Transmitting the transition information to the first network to the mobile terminal
To the network. 6. The method of claim 5,
After the step of transmitting to the mobile terminal,
The mobile terminal transitions to the first network according to the transition information and receives a data service through the first network. The method according to claim 6,
Wherein the base station apparatus of the first network receives subscriber information of the mobile terminal from a server storing subscriber information,
After the data service is provided, when the data service is completed, the base station apparatus of the first network determines a transition to the second network of the mobile terminal according to the subscriber information; And
And transitioning the mobile terminal to the second network when a transition to the second network is determined. 8. The method of claim 7,
Wherein the base station apparatus of the first network determines a transition of the mobile station to the second network when the subscriber information is set to be the mobile station staying in the second network Way. 6. The method of claim 5,
Wherein determining the transition to the first network comprises:
Confirming a transition possibility of the mobile terminal to the first network; And
When the possibility of transition to the first network is confirmed, the mobile terminal confirms transition information for transition to the first network
To the network. 6. The method of claim 5,
Wherein the step of determining whether the data service call is an outgoing call comprises: when the data service call is not an outgoing call, the base station apparatus of the second network provides a data service for the mobile terminal. 11. The method of claim 10,
When the data service call is an incoming call but the data service is set to be performed by the first network by the user of the mobile terminal, the transition to the first network is determined . A base station apparatus of a first network capable of providing only a packet service,
A setting unit configured to set a network priority such that a priority of a second network capable of providing a CS (Circuit Switch) service is higher than a priority of the first network; And
When a call connection request is received from a mobile terminal connected to the first network, a call response process for the call connection request to transition the mobile terminal to the second network according to a network priority set by the setting unit The call processing unit
. 13. The method of claim 12,
Wherein the base station apparatus is a Mobility Management Entity (MME) of the first network,
The call processing unit receives an initial context connection request from the eNodeB of the first network and transmits the established network priority to the eNodeB through an initial context connection response
And the base station apparatus. A base station apparatus of a first network capable of providing a packet service and a circuit switch (CS) service,
A call processing unit for receiving a call connection request from the mobile terminal and transmitting a response to the call connection request and transmitting a response indicating a network transition to the mobile terminal when a network transition of the mobile terminal is required;
A direction determiner for determining whether a data service call request received from the mobile terminal through the call processor is an outgoing call;
A transition determining unit for making a transition to the second network capable of providing only packet service when the data service call request received from the mobile station is determined to be an outgoing call by the direction determining unit; And
And a transition information confirmation unit for transmitting the transition information to the mobile terminal through the call processing unit when the network transition of the mobile station is determined by the transition determining unit,
. 15. The method of claim 14,
The transition information verifying unit,
The control unit checks whether or not a transition from the mobile station to the second network is possible through the call processing unit. If it is determined that a transition is possible, the control unit checks the frequency information of the second network, To the mobile terminal. 15. The method of claim 14,
Wherein the call processing unit processes the data service for the mobile terminal through the first network when it is determined by the direction determination unit that the data service call request received from the mobile terminal is not an outgoing call, .

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