KR20200000022A - Device and method supporting heterogeneous communication systems of user equipment based on service characteristics - Google Patents

Abstract

Disclosed are a device and a method for supporting a heterogeneous communication system based on service characteristics. According to one embodiment of the present invention, a method of a base station supporting a second communication system of a terminal connected to a first communication system based on service characteristics comprises the steps of: receiving information on whether to allow the second communication system of the terminal; receiving whether to allow the second communication system of a bearer supporting services based on the service characteristics; receiving availability of the second communication system of the terminal; determining whether to support the second communication system of the service on the basis of the information on whether to allow the second communication system of the terminal, whether to allow the second communication system of the bearer supporting the services based on the service characteristics and availability of the second communication system of the terminal; and changing the bearer supporting the services to the second communication system when it is determined to support the second communication system of the services. The present invention provides a heterogeneous communication system of a terminal by considering service characteristics and accordingly, can improve service quality.

Description

DEVICE AND METHOD SUPPORTING HETEROGENEOUS COMMUNICATION SYSTEMS OF USER EQUIPMENT BASED ON SERVICE CHARACTERISTICS}

The present invention relates to an apparatus and method for supporting a heterogeneous communication system of a terminal based on a service characteristic.

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

The communication system should support the appropriate level of service quality and mobility in consideration of the service characteristics used by the user. Since the LTE communication system, a 5G (5 generation) communication system is being developed to meet wireless data traffic demand. LTE communication systems have wide coverage to meet coverage requirements, while 5G communication systems have small coverage to meet communication capacities. In this case, the 5G cell may be disposed together with the LTE cell or may be disposed independently. The 5G communication system can be largely divided into a 5G SA (standalone) communication system and a 5G non-standalone (NSA) communication system depending on whether the service is provided in conjunction with the LTE communication system.

In a 5G NSA communication system in which a 5G cell and an LTE cell are disposed together, a method of transmitting control data through an LTE communication system and transmitting user data through a 5G communication system has been proposed. However, in the proposed method, the data transmission speed is fast, but stability may be a problem in services that need to maintain the quality of service and require continuous data transmission such as voice service.

This embodiment has a main purpose in improving the quality of a service by providing a heterogeneous communication system of a terminal in consideration of service characteristics in a 5G NSA communication system.

According to an aspect of the present embodiment, a method of a base station supporting a second communication system of a terminal connected to a first communication system based on a service characteristic may include receiving information on whether the terminal allows the second communication system; Receiving whether to allow the second communication system of the bearer supporting the service based on the service characteristics, receiving the availability of the second communication system of the terminal, whether to accept the second communication system of the terminal Determine whether to support a second communication system of a bearer supporting the service based on the information, the service characteristic, and whether the second communication system of the terminal is available; And a bearer supporting the service if the second communication system of the service is determined to support the second communication system. It includes the step of changing.

According to another aspect of the present embodiment, a base station apparatus supporting a second communication system of a terminal connected to a first communication system based on a service characteristic receives information on whether the terminal permits a second communication system and the service. A transceiver for receiving a second communication system of a bearer supporting a service based on a characteristic, and receiving the availability of a second communication system of the terminal, and information on whether the second communication system of the terminal is allowed Determine whether to support a second communication system of a bearer supporting the service based on the service characteristic, and whether to support the second communication system of the service based on whether the second communication system of the terminal is available; And, when determining to support the second communication system of the service, change the bearer supporting the service to the second communication system. It is a control unit.

According to another aspect of the present embodiment, a method of a terminal for changing a connection from a first communication system to a second communication system based on a characteristic of a service may include: requesting a service using the first communication system; 2 determining whether the communication system is available, transmitting the determined information to a base station, generating a bearer supporting the service with the second communication system, and generating the bearer with the second communication system. It includes the process of receiving the service through.

According to another aspect of the present embodiment, a terminal device that changes a connection from a first communication system to a second communication system based on a characteristic of a service determines whether or not the second communication system of the terminal is available and provides the service. A supporting bearer is generated with the second communication system, a control unit receiving the service through the bearer generated with the second communication system, a service request using the first communication system, and the determined information is determined by a base station. It includes a transceiver for transmitting to.

As described above, according to the present embodiment, the service quality can be improved by providing a heterogeneous communication system of the terminal in consideration of service characteristics.

1 illustrates a 5G NSA communication system in which a 5G communication system coexists with an LTE communication system according to an embodiment of the present disclosure.
2 is a diagram illustrating a structure in which a 5G communication system and an LTE communication system support a terminal together in an 5G NSA communication system as an example;
3 illustrates a method of supporting a heterogeneous communication system based on a service characteristic according to an embodiment of the present disclosure;
4 is a diagram illustrating a method of supporting a heterogeneous communication system based on a service characteristic according to another embodiment of the present disclosure;
5 illustrates a method of supporting a heterogeneous communication system based on a service characteristic according to another embodiment of the present disclosure;
6 is a flowchart illustrating an operation of an LTE eNB according to the present disclosure;
7 is a flowchart illustrating an operation of a terminal according to the present disclosure;
8 is a diagram illustrating a configuration of an LTE eNB according to the present disclosure;
9 is a diagram illustrating a configuration of a terminal according to the present disclosure.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. Throughout the specification, when a part is said to include, 'include' a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated. . In addition, as described in the specification. The terms 'unit' and 'module' refer to a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software.

One communication system can coexist and operate with other heterogeneous communication systems.

1 is a diagram illustrating a 5G NSA communication system in which a 5G communication system coexists with an LTE communication system according to an embodiment of the present disclosure.

According to FIG. 1, the cell coverage 110 of the LTE communication system is wide while the cell coverage 120, 130, 140, 150 of the 5G communication system is narrow. As a result, some regions 160 may not be supported by the 5G communication system depending on the cell arrangement.

In 5G communication system, data transmission speed is faster than LTE communication system. However, if the terminal is located in an area not supported by the 5G communication system, the service supported by the 5G communication system may be interrupted. Accordingly, LTE communication systems are more suitable for services that prioritize stability over data transmission speed, and 5G communication systems are more suitable for services that prioritize faster data transmission speed than stability. For example, in the case of a voice service, even if a slight delay occurs, it is not a problem, but if the voice service is interrupted, it may cause inconvenience to the user. On the other hand, web surfing, a data service, is important to download quickly because it uses a page for a certain period of time rather than continuously changing web pages. Therefore, a 5G communication system is more suitable for a service that prioritizes data transmission speed than an LTE communication system.

2 is a diagram illustrating a structure in which a 5G communication system and an LTE communication system support a terminal together in an 5G NSA communication system as an example.

According to the 5G NSA communication system, an LTE communication system (hereinafter referred to as 'LTE') 220 and a 5G new radio (NR) communication system (hereinafter referred to as an evolved packet core (EPC) 240) as a radio access network (RAN). '5G NR', '5G', or 'NR') 230 may be connected. As described above, LTE has a low data transmission speed but is stable due to continuity, while 5G NR has a high data transmission speed but is not stable.

If the terminal 210 is capable of accessing both the LTE 220 and the 5G NR 230 and supports both the LTE 220 and the 5G NR 230, the terminal 210 uses the LTE 220 to control data. And transmit and receive user data using LTE 220 and / or 5G NR 230. That is, control data is transmitted and received from the EPC 240 to the terminal 210 via the LTE 220, and the user data is transmitted from the EPC 240 to the terminal 210 via the LTE 220 and / or 5G NR 230. It can be transmitted and received by. In this case, the LTE 220 and the 5G NR 230 may exchange information on user data transmitted to the terminal 210.

In the following embodiments, the terminal connects the LTE communication system to the basic communication system, and may be selectively and additionally connected to the 5G communication system.

3 is a diagram illustrating a method of supporting a heterogeneous communication system based on a service characteristic according to an embodiment of the present disclosure.

First, the terminal 301 connects to a communication system to use a service. In detail, the home location register (HLR) 311 transmits information on the subscriber of the terminal 301 to the mobility management entity (MME) 309 (321). The information on the subscriber may include information on whether a heterogeneous communication system can be used. For example, the subscriber may optionally use only LTE, or both 5G NR and LTE, depending on the plan.

The MME 309 determines whether to allow the terminal 301 to be connected to the 5G NR based on the information on the subscriber, that is, whether to allow the 5G NR of the terminal 301 (323).

Then, the MME 309 transmits to the LTE evolved-NodeB (eNB) 303 about whether the determined 5G NR of the terminal 301 is allowed, and the LTE eNB 303 determines whether to allow the 5G NR determined above. It may transmit to 301 (325). However, if the information on the subscriber is stored in the terminal 301, the LTE eNB 303 may not transmit to the terminal 301 whether to allow the determined 5G NR.

In addition, the MME 309 sets whether to allow 5G NR per bearer to establish a bearer and transmits to the LTE eNB 303 (327). For example, a bearer type indicating whether to allow 5G NR per bearer may be added to an initial context setup message or an E-RAS setup message transmitted by the MME 309 to the LTE eNB 303. The bearer type may be expressed as 'LTE only (5G NR not allowed)' or '5G NR allowed'. Specifically, if the voice service supports only LTE and the QCI (QoS class identifier) of the voice service is 1/2/5, the MME 309 performs LTE bearer type on the bearer type for the bearer having the QCI of 1/2/5. It can be set to transmit to the LTE eNB (303). In this case, if the bearer type is not added to the initial context setup message or the E-RAS setup message, the LTE eNB 303 may determine that 5G NR is allowed for the bearer except QCI 1/2/5. As another example, the MME 309 may transmit a service other than the voice service to the LTE eNB 303 by setting 5G NR allowance for a bearer having a QCI of 8/9. In this case, the LTE eNB 303 may determine that the bearer type is LTE only if the bearer type is not added to the initial context setup message or the E-RAS setup message. That is, the MME 309 may be informed only when the communication system is changed while pre-determining whether to allow the heterogeneous communication system for the bearer. Alternatively, the MME 309 may always transmit a bearer type to the LTE eNB 303 by including the initial context setup message or the E-RAS setup message.

The terminal 301 determines whether 5G NR is available and transmits the result to the LTE eNB 303 (329). In more detail, the terminal 301 determines whether the terminal 301 is in a region that supports 5G NR, whether the terminal 301 is a terminal capable of using 5G NR, and reception sensitivity. It can be determined whether NR is available.

The LTE eNB 303 determines whether the terminal 301 uses the 5G NR based on whether the 5G NR determined by the terminal 301 is available and information on the subscriber of the terminal 301 (331). ).

If the UE 301 can use the 5G NR, the LTE eNB 303 determines whether to use the 5G NR for each bearer according to whether to allow 5G NR for each bearer set by the MME 309 (333).

Here, the UE and the bearer are divided to determine whether to use 5G NR. However, the LTE eNB 303 may decide at a time.

Bearers allowed for 5G NR are reset (335). That is, if 5G NR is allowed, the bearer is reconfigured to the terminal 301, the base station of the 5G NR, the gNB 305, the gateway 307, and the MME 309.

Thereafter, the terminal 301 transmits data to the gNR 305 for the bearer for which 5G NR is allowed (337), and transmits data to the LTE eNB 303 for a bearer for which only 5G NR is not allowed, that is, a LTE only allowed bearer. Send (339).

Hereinafter, the same process as in FIG. 3 is shown using the same identification number, and a detailed description thereof will be omitted.

4 is a diagram illustrating a method of supporting a heterogeneous communication system based on a service characteristic according to another embodiment of the present disclosure.

In detail, the embodiment described with reference to FIG. 4 is a method of using an allocation and retention priority (ARP) which is another parameter representing a quality of service (QoS) of a bearer.

The terminal 301 connects to a communication system to use a service. The HLR 311 transmits information on the subscriber of the terminal 301 to the MME 309 (321), and the MME 309 indicates that the terminal 301 is connected to the 5G NR based on the information on the subscriber. It is determined whether to allow, that is, whether to allow 5G NR (323). Thereafter, the MME 309 transmits to the LTE eNB 303 and the LTE eNB 303 transmits to the terminal 301 whether the 5G NR of the terminal 301 is allowed (325).

The MME 309 determines the ARP according to whether 5G NR per bearer is allowed (401). The ARP was a parameter only involved in bearer generation or rejection, but may be further indicated in this embodiment as to whether 5G NR is allowed. For example, whether or not to allow 5G NR may be determined as a range of the priority field of the ARP. If ARP is a value between 0 and 15, 5G NR may be determined to be unacceptable. If ARP is 16 or more, 5G NR may be determined to be allowed. Or vice versa.

The MME 309 transmits to the LTE eNB 303 whether to allow 5G NR for each bearer including the determined ARP (403). In this case, the determined ARP may be included in an Initial context setup message or an E-RAS setup message.

The terminal 301 determines whether 5G NR is available and transmits the result to the LTE eNB 303 (329), and the LTE eNB 303 determines whether the terminal 301 uses the 5G NR ( 331).

If the terminal 301 can use the 5G NR, the LTE eNB 303 determines whether to use the bearer 5G NR based on the ARP received from the MME 309 (405).

Bearers allowed for 5G NR are reset (407). That is, if 5G NR is allowed, a bearer is set to the terminal 301, the gNB 305, the gateway 307, and the MME 309.

Thereafter, the terminal 301 transmits data to the gNR 305 for the bearer for which 5G NR is allowed (337), and transmits data to the LTE eNB 303 for a bearer for which only 5G NR is not allowed, that is, a LTE only allowed bearer. Send (339).

5 is a diagram illustrating a method of supporting a heterogeneous communication system based on a service characteristic according to another embodiment of the present disclosure.

The terminal 301 connects to a communication system to use a service. The HLR 311 transmits information about the subscriber of the terminal 301 to the MME 309 (321), and whether the MME 309 allows 5G NR of the terminal 301 based on the information on the subscriber. Determine (323).

The MME 309 transmits information on whether the terminal 301 permits 5G NR and information on a bearer available to the terminal 301 to the LTE eNB 303 (511).

Since the terminal 301 uses the LTE communication system as a basic communication system, the LTE eNB 303 first establishes a bearer which is a path for transmitting data with the terminal 301 and the GW 307 (513). That is, the bearer does not use 5G NR.

The terminal 301 receives information on whether 5G NR per QCI is allowed from the management object server 501 (515).

The LTE eNB 303 determines whether the UE 301 uses 5G NR (517).

Thereafter, the LTE eNB 303 and the gNB 305 allocate a resource for the UE 301 to use 5G NR (519).

The LTE eNB 303 reconfigures and transmits a radio resource control (RRC) to the terminal 301 (521). The reconstructed RRC may include a data radio bearer (DRB) ID and a secondary cell (Scell) ID.

The terminal 301 checks the QCI of the received DRB ID (523). The terminal 301 determines whether to use 5G NR based on the QCI of the DRB ID and information on whether to use 5G NR received from the MO server 501.

If it is determined not to allow 5G NR based on whether or not to use 5G NR per QCI transmitted from the MO server 501 and the DRB ID transmitted from the LTE eNB 303, the UE 301 may deny 5G NR use. Reconstruct and transmits to LTE eNB 303 (525).

6 is a flowchart illustrating an operation of an LTE eNB according to the present disclosure.

The LTE eNB receives information on whether to allow the UE to be connected to 5G NR, that is, whether to allow 5G NR (601). Information on whether 5G NR of the terminal is allowed may be information determined by the MME based on the information on the subscriber of the terminal.

The LTE eNB receives whether to allow a bearer supporting the 5G communication system based on a service characteristic (603). The MME may determine whether to allow 5G NR for each bearer to be set. The bearer may be set for each service, and the QoS may be set for each bearer.

The LTE eNB receives availability of the 5G communication system of the terminal from the terminal (605). That is, the terminal determines whether to support the 5G communication system, and if so, whether or not to use the 5G communication system and transmits to the LTE eNB.

The LTE eNB is based on information on whether the UE allows the 5G communication system, based on the service characteristics, whether the bearer supporting the service permits the second communication system, and whether the UE can use the 5G communication system. It is determined whether to support a second communication system of the service (607).

When the LTE eNB determines to support the 5G communication system of the service, the LTE eNB changes the bearer supporting the service to the 5G communication system (609).

In FIG. 6, processes 601 to 609 are described as being sequentially executed, but this is merely illustrative of the technical idea of the exemplary embodiment of the present invention. In other words, a person of ordinary skill in the art to which an embodiment of the present invention belongs may execute the process described in FIG. 6 by changing the order described in FIG. 6 without departing from the essential characteristics of the embodiment of the present invention. Since the above processes may be variously modified and modified to be executed in parallel, FIG. 6 is not limited to the time series order.

7 is a flowchart illustrating an operation of a terminal according to the present disclosure.

The terminal requests a service using the LTE communication system (701). The first communication system may be a communication system already connected to the terminal.

The terminal determines whether the 5G communication system is available (703). In addition, the terminal may determine whether or not the 5G communication system is available at the request of the LTE eNB or periodically.

The terminal transmits the determined information to the LTE eNB (705).

The terminal generates a bearer supporting the service with the 5G communication system (707). Whether to use the 5G communication system may be determined by the LTE eNB, and the terminal may generate the bearer at the request of the LTE eNB. The LTE eNB may determine whether to support the 5G communication system of the terminal based on at least one of QCI, ARP, and EPS.

The terminal receives the service through the bearer created with the 5G communication system (709).

In FIG. 7, processes 701 to 709 are sequentially executed, but this is merely illustrative of the technical idea of the exemplary embodiment of the present invention. In other words, a person of ordinary skill in the art to which an embodiment of the present invention belongs may execute the process described in FIG. 6 by changing the order described in FIG. 6 without departing from the essential characteristics of the embodiment of the present invention. Since the above processes may be variously modified and modified to be executed in parallel, FIG. 7 is not limited to the time series order.

6 to 7 may be embodied as computer readable codes on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. That is, the computer-readable recording medium may be a magnetic storage medium (for example, ROM, floppy disk, hard disk, etc.), an optical reading medium (for example, CD-ROM, DVD, etc.) and a carrier wave (for example, the Internet Storage medium). The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

8 is a diagram illustrating a configuration of an LTE eNB according to the present disclosure.

According to FIG. 8, the LTE eNB may be configured as a transceiver 801 and a controller 803. In FIG. 8, the transmission / reception unit 801 and the control unit 803 are described separately, but may be integrated into one configuration or implemented. Alternatively, one configuration may be implemented by dividing into multiple configurations.

The transmitter / receiver 801 of the LTE eNB receives information on whether the 5G communication system is allowed by the terminal, and receives the permission of the 5G communication system of a bearer supporting a service based on the service characteristics, and controls the LTE eNB. 803 receives availability of the 5G communication system of the terminal. Information on whether 5G NR of the terminal is allowed may be information determined by the MME based on the information on the subscriber of the terminal. The MME may determine whether to allow 5G NR for each bearer to be set.

The control unit 803 of the LTE eNB is information on whether or not to allow the second communication system of the terminal, whether or not the 5G communication system of the bearer supporting the service based on the service characteristics, and the second communication system of the terminal It is determined whether to support the 5G communication system of the service based on the availability, and if the decision to support the 5G communication system of the service is determined, the bearer supporting the service is changed to the 5G communication system.

9 is a diagram illustrating a configuration of a terminal according to the present disclosure.

According to FIG. 9, the terminal may include a transceiver 901 and a controller 903. In FIG. 9, the transmission / reception unit 901 and the control unit 903 are described separately, but may be integrated into one configuration or implemented in one configuration.

The controller 903 of the terminal determines whether the 5G communication system of the terminal is available, generates a bearer supporting the service with the 5G communication system, and generates the bearer through the bearer generated with the 5G communication system. Is supported. In addition, the controller 903 of the terminal may determine whether or not the 5G communication system is available at the request of the LTE eNB or periodically.

The transceiver 901 of the terminal requests a service using the LTE communication system and transmits the determined information to the LTE eNB. In addition, the transceiver 901 of the terminal may receive a request from the LTE eNB, and may transmit information according to the request of the LTE eNB.

In the above description, LTE and 5G have been described as heterogeneous communication systems, but it may be applied to other communication systems.

The above description is merely illustrative of the technical idea of the present embodiment, and those skilled in the art to which the present embodiment belongs may make various modifications and changes without departing from the essential characteristics of the present embodiment. Therefore, the present embodiments are not intended to limit the technical idea of the present embodiment but to describe the present invention, 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 interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present embodiment.

210: terminal 220: LTE
230: 5G NR 240: EPC
301: terminal 303: LTE eNB
305: gNB 307: GW
309: MME 311: HLR

Claims (18)

A method of a base station supporting a second communication system of a terminal connected to a first communication system based on a service characteristic,
Receiving information on whether the terminal permits a second communication system;
Receiving whether to allow a second communication system of a bearer supporting a service based on the service characteristic;
Receiving availability of a second communication system of the terminal;
Information on whether the terminal permits the second communication system, whether the bearer supporting the service is allowed in the second communication system based on the service characteristic, and whether the terminal uses the second communication system; Determining whether to support a second communication system of the; And
Changing a bearer supporting the service to a second communication system when the second communication system of the service is determined to support the second communication system. The method of claim 1,
The second communication of the terminal connected to the first communication system is determined whether the bearer supporting the service based on the service characteristic is allowed based on the quality of service (QoS) class identifier (QCI). The method of base station supporting the system. The method of claim 1,
Base station supporting the second communication system of the terminal connected to the first communication system, characterized in that whether or not to allow the second communication system of the bearer supporting the service based on the service characteristic is indicated by the allocation and retention priority (ARP) Way. The method of claim 1,
The method of the base station supporting the second communication system of the terminal connected to the first communication system, characterized in that the bearer type is indicated whether or not the bearer supporting the service based on the service characteristics. The method of claim 1,
The first communication system is a long term evolution (LTE) communication system, the second communication system is a method of a base station supporting a second communication system of a terminal connected to the first communication system, characterized in that the 5G (generation) communication system. . A base station apparatus supporting a second communication system of a terminal connected to a first communication system based on a service characteristic, the base station apparatus comprising:
Receive information on whether or not to allow the second communication system of the terminal, and whether to accept the second communication system of the bearer supporting the service based on the service characteristics, and whether the second communication system of the terminal is available Receiving and receiving unit,
Information on whether the terminal permits the second communication system, whether the bearer supporting the service is allowed in the second communication system based on the service characteristic, and whether the terminal uses the second communication system; And a controller for determining whether to support a second communication system of the service and changing a bearer supporting the service to a second communication system when determining to support a second communication system of the service. The method of claim 6,
And the controller determines whether to allow a second communication system of a bearer supporting the service based on the service characteristic based on a quality of service (QoS) class identifier (QCI). The method of claim 6,
Base station apparatus according to the service characteristic is indicated by the allocation and retention priority (ARP) whether or not the second communication system of the bearer supporting the service. The method of claim 6,
The base station apparatus according to the characteristic of the service, characterized in that the bearer type whether or not to allow the second communication system of the bearer that supports the service. The method of claim 6,
And the first communication system is a long term evolution (LTE) communication system, and the second communication system is a 5G (generation) communication system. In the method of the terminal for changing the connection from the first communication system to the second communication system based on the characteristics of the service,
Requesting a service using the first communication system;
Determining whether a second communication system of the terminal is available;
Transmitting the determined information to a base station;
Creating a bearer supporting the service with the second communication system;
And a method of changing a connection from a first communication system to a second communication system, the method comprising receiving the service through the bearer created with the second communication system. The method of claim 11,
The bearer supporting the service is determined by the base station based on a quality of service (QoS) class identifier (QoS), the method of the terminal to change the connection from the first communication system to the second communication system, characterized in that . The method of claim 11,
The bearer supporting the service is determined by the base station based on allocation and retention priority (ARP), the method of the terminal to change the connection from the first communication system to the second communication system. The method of claim 11,
The bearer supporting the service is determined by the base station based on the bearer type whether or not to change the connection from the first communication system to the second communication system. A terminal apparatus for changing a connection from a first communication system to a second communication system based on a characteristic of a service,
A controller for determining whether a second communication system of the terminal is available, generating a bearer supporting the service with the second communication system, and receiving the service through the bearer generated with the second communication system; ,
Terminal device for changing the connection from the first communication system to the second communication system including a transceiver for requesting a service using the first communication system, and transmitting the determined information to the base station. The method of claim 15,
The bearer supporting the service is determined to be permitted by the base station based on a quality of service (QoS) class identifier (QoS), the terminal device for changing the connection from the first communication system to the second communication system. The method of claim 15,
And a bearer supporting the service is determined by the base station based on an allocation and retention priority (ARP). The method of claim 15,
The bearer supporting the service is a terminal device for changing the connection from the first communication system to the second communication system, characterized in that it is determined by the base station based on the bearer type.

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