KR101387151B1 - Terminal device and base station, and control method thereof - Google Patents

Abstract

The present invention, in a multi-carrier environment in which a terminal can use a communication service through one of a plurality of frequency bands, a frequency band to which the terminal connects, such as a handover or a redirection, etc. In determining whether or not a connection change needs to be changed, connection change to an optimal frequency band guaranteeing the speed and quality of communication service by dualizing conditions for connection change for each frequency band to be changed. A terminal apparatus and a base station apparatus and a method of operating the apparatus are disclosed.

Description

TECHNICAL FIELD [0001] The present invention relates to a terminal device, a base station device, and a method of operating the same,

The present invention relates to a terminal apparatus and a base station apparatus and a method of operating the apparatus, and more particularly, in a multi-carrier environment in which a terminal can use a communication service through one of a plurality of frequency bands. The terminal and base station apparatus and the method of operating the apparatus which make the connection change possible to the optimum frequency band which guarantees the speed and quality of communication service by dualizing the conditions for the connection change for each frequency band to which the connection is to be changed. It is about.

Recently, operators often provide services based on multiple wireless technologies at the same time. In Korea, major operators are building and servicing networks by introducing WCDMA, CDMA, WiBro and WLAN (WiFi) technology, which is the nearest wireless network. In addition, LTE (Long Term Evolution) network is actively being introduced recently.

In addition, introduction of a terminal (LTE terminal) capable of accessing an LTE network and using a communication service is accelerating.

In recent years, a multi-carrier system that provides communication services using a plurality of different frequency bands in an LTE network has appeared. According to the multicarrier system, the terminal may select one of two frequency bands, for example, two different frequency bands of the LTE network and a frequency band of the 3G network, and receive a communication service therethrough.

Meanwhile, in the existing LTE single carrier system, when the terminal is connected to the base station through the frequency band of the LTE network, the signal strength of other cells in the vicinity is greater than a specific threshold difference than the signal strength of the serving cell. An A3 event occurs, and when an A3 event occurs, the A3 event is reported to the base station, and then a predefined handover (LTE to LTE Handover) procedure is performed.

This is the case of LTE to LTE Handover. In the LTE single carrier system, if the signal strength of the LTE serving cell is lowered below a certain threshold while the terminal is connected to the base station through the frequency band of the LTE network. When the A2 event occurs and the A2 event occurs like this, the LTE network provides a single frequency band so that a redirection procedure can be performed to the frequency band of the 3G network without monitoring the other frequency bands of the LTE network. do.

However, in the multi-carrier system environment as described above, as described above, since a plurality of different frequency bands are provided in one network, that is, the LTE network, a policy for monitoring the signal of another frequency band of the LTE network when an A2 event occurs The terminal receives the information gap (Measurement Gap), in which case the A3 event for two or more frequency bands (frequency band of LTE network and frequency band of 3G network) can be simultaneously reported to the base station. It is expected that a problem cannot be accurately determined for the A3 event.

Therefore, in the present invention, in the multicarrier environment, the optimum frequency band for guaranteeing the speed and quality of the communication service by dualizing the conditions for the connection change for each frequency band to which the connection is to be changed according to handover or connection switching, etc. This paper proposes a method for enabling a connection change.

The present invention has been made in view of the above circumstances, and an object of the present invention is to obtain a frequency to which a terminal is to be changed in a multicarrier environment in which a terminal can use a communication service through one of a plurality of frequency bands. The present invention proposes a terminal device, a base station device, and a method of operating the devices by dualizing a condition for connection change for each band, thereby enabling a connection change to an optimal frequency band that guarantees the speed and quality of a communication service.

According to a first aspect of the present invention, there is provided a terminal apparatus including: a connection unit connecting to a base station using a specific frequency band; A signal strength measuring unit measuring signal strength of a signal received through the specific frequency band; And monitoring the signal strength of the first frequency band corresponding to the first threshold value when the measured signal strength is less than the first threshold value, based on the frequency band for each threshold value that maps different frequency bands for each threshold value. It includes a request unit for requesting policy information to be made.

Preferably, the requesting unit, the policy to monitor the signal strength for the second frequency band corresponding to the second threshold value when the measured signal strength is less than the second threshold value based on the frequency band for each threshold value Request information; The first threshold may be greater than the second threshold.

Preferably, the data transmission rate of the first frequency band may be faster than the data transmission rate of the second frequency band.

Preferably, the first frequency band may be used in the same communication network as the communication network in which the specific frequency band is used, and the second frequency band may be used in a communication network different from the communication network in which the specific frequency band is used.

Preferably, the requesting unit provides the base station with a first A2 (A2) event message associated with the first frequency band or the second a2 (A2) event message with a second frequency band associated with the base station. By providing to, the policy information of the first frequency band or the policy information of the second frequency band can be requested.

A base station apparatus according to a second aspect of the present invention for achieving the above object, the connection unit for connecting to the terminal using a specific frequency band; A signal strength checking unit for checking the signal strength of a signal received by the terminal through the specific frequency band; And a policy information providing unit for providing the terminal with policy information for monitoring signal strength of one first frequency band corresponding to the first threshold value when the checked signal strength is less than the first threshold value. .

Preferably, the policy information providing unit, when the checked signal strength is less than the second threshold value, the policy information for monitoring the signal strength for the other second frequency band corresponding to the second threshold value; Providing to the terminal; The first threshold may be greater than the second threshold.

Preferably, the data transmission rate of the first frequency band may be faster than the data transmission rate of the second frequency band.

Preferably, the first frequency band may be used in the same communication network as the communication network in which the specific frequency band is used, and the second frequency band may be used in a communication network different from the communication network in which the specific frequency band is used.

A method of operating a terminal device according to a third aspect of the present invention for achieving the above object comprises the steps of connecting to a base station using a specific frequency band; A signal strength measuring step of measuring signal strength of a signal received through the specific frequency band; And a signal for one first frequency band corresponding to the first threshold value when the measured signal strength is less than the first threshold value based on a frequency band for each threshold value, in which different frequency bands are mapped to each threshold value. A request step for requesting policy information for monitoring the strength.

Preferably, the requesting step, based on the frequency band for each threshold value, when the measured signal strength is less than a second threshold value, the signal strength of another second frequency band corresponding to the second threshold value The method may include requesting policy information for monitoring.

Preferably, the requesting step may include providing a first A2 (A2) event message associated with the first frequency band to the base station, or providing a second A2 (A2) event message associated with the second frequency band. Provided to the base station, it can request the policy information of the first frequency band or the policy information of the second frequency band.

A method of operating a base station apparatus according to a fourth aspect of the present invention for achieving the above object includes a connection step of connecting to a terminal using a specific frequency band; A signal strength checking step of checking a signal strength of a signal received by the terminal through the specific frequency band; When the checked signal strength is less than the first threshold, the terminal provides policy information for monitoring signal strength of one first frequency band corresponding to the first threshold, and the checked signal strength is second. If it is less than the threshold value includes the policy information providing step of providing the terminal with policy information for monitoring the signal strength for the other second frequency band corresponding to the second threshold value.

Accordingly, the terminal device and the base station device of the present invention and the operation method of the device, in the multi-carrier environment in which the terminal can use the communication service through one of the plurality of frequency bands, the target to change the connection By dualizing the conditions for the connection change for each of the frequency bands, it is possible to change the connection to an optimal frequency band that guarantees the speed and quality of the communication service.

1 is a configuration diagram illustrating a communication system including a terminal apparatus and a base station apparatus according to a preferred embodiment of the present invention.
2 is a control block diagram illustrating a terminal device according to a first preferred embodiment of the present invention.
3 is a control block diagram illustrating a base station apparatus according to a second preferred embodiment of the present invention.
4 is a flowchart illustrating an operation of a communication system including a terminal apparatus and a base station apparatus according to a first embodiment of the present invention.
5 is a flowchart illustrating an operation of a communication system including a terminal apparatus and a base station apparatus according to a second embodiment of the present invention.
6 is a flowchart illustrating an operation method of a terminal according to a first embodiment of the present invention.
7 is a flowchart illustrating an operation method of a base station apparatus according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating a communication system including a terminal apparatus and a base station apparatus according to a preferred embodiment of the present invention.

As shown in FIG. 1, the communication system includes a terminal device 100 and 200 supporting a multi-carrier system, and a base station device 300 and 400 connected to the terminal device 100 and 200 through a specific frequency band. .

The terminal devices 100 and 200 are terminals supporting a multi-carrier system that provides communication services using a plurality of different frequency bands.

The base station apparatuses 300 and 400 are base stations supporting the aforementioned multi-carrier system.

Accordingly, the terminal apparatuses 100 and 200 may use a communication service through communication with the base station apparatuses 300 and 400 by connecting to the base station apparatuses 300 and 400 using one specific frequency band among a plurality of different frequency bands.

Here, the plurality of different frequency bands may be a plurality of frequency bands used in one communication network. Alternatively, the different plurality of frequency bands may be a plurality of frequency bands used in two or more different communication networks, for example, one frequency band used in the first communication network and two frequency bands used in the second communication network. can do.

Here, the first communication network may be a 3G network and the second communication network may be an LTE network.

Hereinafter, for convenience of description, the terminal apparatuses 100 and 200 and the base station apparatus 300 and 400 will be described with reference to a state where they are interconnected through a specific frequency band which is one of two frequency bands used in the second communication network. do.

As such, when the terminal apparatuses 100 and 200 are connected to the base stations 300 and 400 through a specific frequency band, the terminal apparatuses 100 and 200 may use the signal strength of the serving cell, that is, the signal strength of the signal received through the specific frequency band. Measure continuously.

This is to determine whether or not a connection change that requires changing a frequency band to be connected, such as a handover or a redirection, is necessary based on the measured signal strength of the serving cell.

In the present invention, in determining whether a connection change such as a handover or a redirection is necessary, the present invention intends to dualize conditions for connection change for each frequency band to be changed. .

The terminal device 100 and the base station device 300 will be described with reference to the first embodiment of the present invention for this purpose.

The terminal device 100 continuously measures the signal strength of a serving cell, that is, a signal received through a specific frequency band, while being connected to the base station apparatus 300 through a specific frequency band.

The terminal device 100 preferably stores frequency bands for each threshold value in which different frequency bands are mapped to each threshold value.

Accordingly, the terminal device 100 monitors the signal strength of the first frequency band corresponding to the first threshold value when the measured signal strength is less than the first threshold value based on the frequency band for each threshold value. Request the information to the base station apparatus 300.

In this case, the terminal apparatus 100 provides the base station apparatus 300 with policy information for providing a first A2 event message related to the first frequency band to the base station apparatus 300 to monitor signal strength of the first frequency band. You can request

In this case, the base station apparatus 300 checks the first A2 event message provided from the terminal apparatus 100, and transmits policy information (Measurement Gap) to monitor the signal for the first frequency band accordingly. 100).

Accordingly, the terminal device 100 monitors the signal strength of the signal received through the first frequency band based on the policy information of the first frequency band, and the signal strength of the first frequency band of the specific frequency band currently connected. It may be determined whether a case where a specific threshold difference is greater than a signal strength occurs, that is, whether an A3 event occurs.

Accordingly, when the A3 event occurs, the terminal device 100 reports the A3 event message to the base station apparatus 300 and then the handover predefined for the first frequency band through interworking with the base station apparatus 300. By performing a procedure or a redirection procedure, a connection change may be performed from a specific frequency band to the first frequency band.

Meanwhile, the terminal device 100 determines whether an A3 event occurs based on the policy information of the first frequency band, and continuously measures the signal strength of the serving cell, that is, a specific frequency band. It is determined whether the signal strength of the received signal falls below the second threshold.

Accordingly, the terminal device 100 transmits the policy information to the base station device 300 to monitor the signal strength of the second frequency band corresponding to the second threshold value when the measured signal strength is less than the second threshold value. request.

In this case, the terminal apparatus 100 provides the base station apparatus 300 with policy information for providing a second A2 event message related to the second frequency band to the base station apparatus 300 to monitor signal strength of the second frequency band. You can request

In this case, the base station apparatus 300 checks the second A2 event message provided from the terminal apparatus 100 and transmits policy information (Measurement Gap) to monitor the signal for the second frequency band accordingly. 100).

Accordingly, the terminal device 100 monitors the signal strength of the signal received through the second frequency band based on the policy information of the second frequency band, and the signal strength of the second frequency band of the specific frequency band currently connected. It may be determined whether a case where a specific threshold difference is greater than a signal strength occurs, that is, whether an A3 event occurs.

Accordingly, when the A3 event occurs, the terminal device 100 reports an A3 event message to the base station apparatus 300 and then performs a handover predefined for the second frequency band through interworking with the base station apparatus 300. By performing a procedure or a redirection procedure, a connection change may be performed from a specific frequency band to the second frequency band.

On the other hand, the terminal apparatus 200 and the base station apparatus 400 will be described with reference to the second embodiment of the present invention.

The base station apparatus 400 checks the signal strength of a signal that the connected terminal apparatus 200 receives through a specific frequency band.

For example, the terminal device 200 continuously connects the signal strength of a serving cell, that is, the signal strength of a signal received through a specific frequency band, while being connected to the base station apparatus 400 through a specific frequency band. Measure

Accordingly, by reporting the signal strength continuously measured by the terminal apparatus 200 to the base station apparatus 400 as described above, the base station apparatus 400 may check the signal strength reported from the terminal apparatus 200.

Therefore, the base station apparatus 400, the policy information for monitoring the signal strength for the first frequency band corresponding to the first threshold value when the signal strength checked with respect to the terminal device 200 is less than the first threshold value (Measurement Gap) may be provided to the terminal device 200.

Accordingly, the terminal device 200 monitors the signal strength of a signal received through the first frequency band based on the policy information of the first frequency band, and the signal strength of the first frequency band of the specific frequency band currently connected. It may be determined whether a case where a specific threshold difference is greater than a signal strength occurs, that is, whether an A3 event occurs.

Accordingly, when the A3 event occurs, the terminal device 200 reports an A3 event message to the base station apparatus 400, and thereafter, a handover predefined for the first frequency band through interworking with the base station apparatus 400. By performing a procedure or a redirection procedure, a connection change may be performed from a specific frequency band to the first frequency band.

Meanwhile, the base station apparatus 400 checks whether an A3 event message related to the first frequency band is reported from the terminal apparatus 200, and at the same time, a serving cell which is confirmed as described above with respect to the terminal apparatus 200. It is determined whether the signal strength of the signal received by the terminal apparatus 200 through the signal strength of the specific frequency band falls below the second threshold.

Thus, the base station apparatus 400, the policy information to monitor the signal strength for the second frequency band corresponding to the second threshold value when the signal strength checked with respect to the terminal device 200 is less than the second threshold value (Measurement Gap) may be provided to the terminal device 200.

Accordingly, the terminal device 200 monitors the signal strength of a signal received through the second frequency band based on the policy information of the second frequency band, and the signal strength of the second frequency band of the specific frequency band currently connected. It may be determined whether a case where a specific threshold difference is greater than a signal strength occurs, that is, whether an A3 event occurs.

Accordingly, when the A3 event occurs, the terminal device 200 reports an A3 event message to the base station apparatus 400, and thereafter, a handover predefined for the second frequency band through interworking with the base station apparatus 400. By performing a procedure or a redirection procedure, a connection change may be performed from a specific frequency band to the second frequency band.

Hereinafter, the configuration of the terminal device according to the first embodiment of the present invention will be described in more detail with reference to FIG.

The terminal device 100 according to the present invention includes a connection unit 110 for connecting to the base station apparatus 300 using a specific frequency band, and a signal strength measuring unit for measuring signal strength of a signal received through the specific frequency band. 120 and the first frequency band corresponding to the first threshold value when the measured signal strength is less than the first threshold value, based on a frequency band for each threshold value that maps different frequency bands for each threshold value. It includes a request unit 130 for requesting the policy information to monitor the signal strength.

The connection unit 110 may use a communication service through communication with the base station apparatus 300 by connecting to the base station apparatus 300 using one specific frequency band among a plurality of different frequency bands.

Here, the plurality of different frequency bands is preferably a plurality of frequency bands used in two or more different communication networks, for example, one frequency band used in the first communication network and two frequency bands used in the second communication network. It may include.

Here, the first communication network may be a 3G network and the second communication network may be an LTE network.

Hereinafter, for convenience of description, the state in which the connection unit 110 is connected to the base station apparatus 300 through a specific frequency band, which is one of two frequency bands used in the above-described second communication network, will be described.

The signal strength measuring unit 120 measures the signal strength of a serving cell to which the connection unit 110 is connected, that is, the signal strength of a signal received through a specific frequency band currently connected to the base station apparatus 300. For example, the signal strength measuring unit 120 may measure a reference signal received power (RSRP) of the received signal.

The requester 130 stores frequency bands for each threshold value to which different frequency bands are mapped for each threshold value.

Here, the frequency band for each threshold value may include a first threshold value and a second threshold value smaller than the aforementioned first threshold value.

In this case, the first frequency band mapped to the first threshold value larger than the second threshold value is the same as the second communication network (eg, LTE network) in which a specific frequency band to which the terminal apparatus 100 is currently connected is used. Preferably, the second frequency band mapped to the second threshold value is a first communication network (eg, 3G) different from the second communication network in which the specific frequency band to which the terminal apparatus 100 is currently connected is used. Preferably a frequency band used in the network).

In addition, it is preferable that the data transmission rate of the first frequency band mapped to the first threshold value is faster than the data transmission rate of the second frequency band mapped to the second threshold value.

The requester 130, based on the frequency band for each threshold value, when the signal strength measured by the signal strength measurer 120 falls below the first threshold value, the signal for the first frequency band corresponding to the first threshold value. The base station apparatus 300 requests policy information for monitoring the strength.

In this case, the requesting unit 130 provides the base station apparatus 300 with policy information for providing a first A2 event message related to the first frequency band to the base station apparatus 300 to monitor signal strength of the first frequency band. You can request

That is, the requester 130 recognizes that the A2 event for the first threshold occurs when the measured signal strength drops below the first threshold, and thus, the first frequency corresponding to the first threshold. The first A2 event message including the identifier for identifying the band may be provided to the base station apparatus 300.

In this case, the base station apparatus 300 checks the first A2 event message provided from the terminal apparatus 100, and transmits policy information (Measurement Gap) to monitor the signal for the first frequency band accordingly. 100) will provide.

Accordingly, the terminal device 100 monitors the signal strength of the signal received through the first frequency band based on the policy information of the first frequency band, and the signal strength of the first frequency band of the specific frequency band currently connected. It may be determined whether a case where a specific threshold difference is greater than a signal strength occurs, that is, whether an A3 event occurs.

Accordingly, when the A3 event occurs, the terminal device 100 reports the A3 event message to the base station apparatus 300 and then the handover predefined for the first frequency band through interworking with the base station apparatus 300. By performing a procedure or a redirection procedure, a connection change may be performed from a specific frequency band to the first frequency band.

Meanwhile, the requester 130 determines whether an A3 event occurs based on the policy information of the first frequency band, and at the same time, the signal strength of the serving cell, which is measured continuously, that is, a specific frequency band. Whether the signal strength of the signal received through is lowered below the second threshold is determined based on the frequency band for each threshold.

Therefore, the requester 130 monitors the signal strength of the second frequency band corresponding to the second threshold when the measured signal strength is less than the second threshold based on the frequency band for each threshold. Request the information to the base station apparatus 300.

At this time, the requesting unit 130 provides the base station apparatus 300 with policy information for providing a second A2 event message related to the second frequency band to the base station apparatus 300 to monitor signal strength of the second frequency band. You can request

That is, the requesting unit 130 recognizes that the A2 event for the second threshold occurs when the measured signal strength falls below the second threshold, and the second frequency corresponding to the second threshold. The second A2 event message including the identifier for identifying the band may be provided to the base station apparatus 300.

In this case, the base station apparatus 300 checks the second A2 event message provided from the terminal apparatus 100 and transmits policy information (Measurement Gap) to monitor the signal for the second frequency band accordingly. 100) will provide.

Accordingly, the terminal device 100 monitors the signal strength of the signal received through the second frequency band based on the policy information of the second frequency band, and the signal strength of the second frequency band of the specific frequency band currently connected. It may be determined whether a case where a specific threshold difference is greater than a signal strength occurs, that is, whether an A3 event occurs.

Accordingly, when the A3 event occurs, the terminal device 100 reports an A3 event message to the base station apparatus 300 and then performs a handover predefined for the second frequency band through interworking with the base station apparatus 300. By performing a procedure or a redirection procedure, a connection change may be performed from a specific frequency band to the second frequency band.

Meanwhile, in the above-described method, the signal strength measuring unit 120 provides the first A2 event message as the signal strength measured by the signal strength measuring unit 120 decreases from the first threshold value to less than the first threshold value. The case where the measured signal strength drops below the second threshold to provide the second A2 event message has been described with reference to this, but this is only an example.

For example, the signal strength measured by the signal strength measuring unit 120 may be less than the second threshold value from the beginning.

As such, when the signal strength measured by the signal strength measuring unit 120 is less than the second threshold value from the beginning, the requesting unit 130 does not provide the first A2 event message, and the second corresponding to the second threshold value is provided. The base station apparatus 300 may request the base station apparatus 300 to provide a second A2 event message related to the frequency band to monitor the signal strength of the second frequency band.

In this case, the base station apparatus 300 checks the second A2 event message provided from the terminal apparatus 100 and transmits policy information (Measurement Gap) to monitor the signal for the second frequency band accordingly. 100) will provide.

Accordingly, the terminal device 100 monitors the signal strength of the signal received through the second frequency band based on the policy information of the second frequency band provided from the base station apparatus 300 confirming the second A2 event message. It may be determined whether an event occurs.

As such, the terminal apparatus 100 according to the first embodiment of the present invention, in a multicarrier environment, each frequency band as a connection change object for connection change, in particular, another frequency band (for example, a first frequency band) in the same communication network and By applying different threshold values for the A2 event occurrence to each of frequency bands (for example, the second frequency band) of another communication network, the conditions for connection change can be dualized for each frequency band to be changed. In dualizing the change condition, a frequency band with a high data rate can be considered as a connection change target first, thereby enabling a connection change to an optimal frequency band that guarantees the speed and quality of a communication service.

Hereinafter, the configuration of the base station apparatus according to the second embodiment of the present invention will be described in more detail with reference to FIG. 3.

The base station apparatus 400 according to the present invention includes a connection portion 410 for connecting to the terminal apparatus 200 using a specific frequency band and a signal strength of a signal received by the terminal apparatus 200 through the specific frequency band. Signal strength confirmation unit 420 for confirming the, and if the confirmed signal strength is less than the first threshold value, the policy information for monitoring the signal strength for one first frequency band corresponding to the first threshold value The policy information providing unit 430 provided to the terminal device 200 is included.

The connection unit 410 connects to the terminal device 200 using one specific frequency band among a plurality of different frequency bands so that the terminal device 200 can use a communication service.

Here, the plurality of different frequency bands is preferably a plurality of frequency bands used in two or more different communication networks, for example, one frequency band used in the first communication network and two frequency bands used in the second communication network. It may include.

Here, the first communication network may be a 3G network and the second communication network may be an LTE network.

Hereinafter, for convenience of description, the connection unit 410 will be described with reference to a state in which the connection unit 410 is connected to the terminal device 200 through a specific frequency band which is one of two frequency bands used in the above-described second communication network.

The signal strength checking unit 420 checks the signal strength of a signal that the terminal device 200 connected through the connection unit 410 receives through a specific frequency band.

For example, the terminal device 200 continuously connects the signal strength of a serving cell, that is, the signal strength of a signal received through a specific frequency band, while being connected to the base station apparatus 400 through a specific frequency band. Measure

In response to the signal strength continuously measured by the terminal device 200 as described above to the base station device 400, the signal strength check unit 420 of the base station device 400 is signal strength reported from the terminal device 200 You can check.

The policy information providing unit 430 monitors the signal strength of one first frequency band corresponding to the first threshold when the signal strength checked by the signal strength checking unit 420 is less than the first threshold. The policy information may be provided to the terminal device 200.

Accordingly, the terminal device 200 monitors the signal strength of a signal received through the first frequency band based on the policy information of the first frequency band, and the signal strength of the first frequency band of the specific frequency band currently connected. It may be determined whether a case where a specific threshold difference is greater than a signal strength occurs, that is, whether an A3 event occurs.

Accordingly, when the A3 event occurs, the terminal device 200 reports an A3 event message to the base station apparatus 400, and thereafter, a handover predefined for the first frequency band through interworking with the base station apparatus 400. By performing a procedure or a redirection procedure, a connection change may be performed from a specific frequency band to the first frequency band.

Meanwhile, the policy information provider 430 checks whether an A3 event message related to the first frequency band is reported from the terminal device 200, and the signal strength continuously checked by the signal strength checker 420 is second. It is determined whether to go below the threshold.

Thus, the policy information providing unit 430, if the signal strength confirmed with respect to the terminal device 200 is less than the second threshold value, the policy information to monitor the signal strength for the second frequency band corresponding to the second threshold value The measurement gap may be provided to the terminal device 200.

Accordingly, the terminal device 200 monitors the signal strength of a signal received through the second frequency band based on the policy information of the second frequency band, and the signal strength of the second frequency band of the specific frequency band currently connected. It may be determined whether a case where a specific threshold difference is greater than a signal strength occurs, that is, whether an A3 event occurs.

Accordingly, when the A3 event occurs, the terminal device 200 reports an A3 event message to the base station apparatus 400, and thereafter, a handover predefined for the second frequency band through interworking with the base station apparatus 400. By performing a procedure or a redirection procedure, a connection change may be performed from a specific frequency band to the second frequency band.

Meanwhile, in the above description, the signal strength of the terminal device 200 confirmed by the signal strength checking unit 420 is lowered from the first threshold value to less than the first threshold value, thereby providing the policy information of the first frequency band, and then the signal. Although the signal strength of the terminal device 200 confirmed by the strength checking unit 420 is lowered below the second threshold and provides policy information of the second frequency band, this is only an example.

For example, the signal strength of the terminal device 200 confirmed by the signal strength checking unit 420 may be less than the second threshold value from the beginning.

As such, when the signal strength of the terminal device 200 confirmed by the signal strength checking unit 420 is less than the second threshold value from the beginning, the policy information providing unit 430 does not provide the policy information of the first frequency band. Policy information of the second frequency band corresponding to the second threshold value may be provided to the terminal device 200.

In this case, the first threshold value is greater than the second threshold value described above, and the first frequency band mapped to the first threshold value greater than the second threshold value is determined by the terminal device 200 and the base station device 400. Preferably, the specific frequency band currently being accessed is a frequency band used in the same second communication network as the second communication network (for example, LTE network), and the second frequency band mapped to the second threshold is the terminal device 200. And the base station apparatus 400 is preferably a frequency band used in a first communication network (for example, 3G network) different from the second communication network in which a specific frequency band to which the base station apparatus 400 is currently connected is used.

In addition, it is preferable that the data transmission rate of the first frequency band mapped to the first threshold value is faster than the data transmission rate of the second frequency band mapped to the second threshold value.

As such, the base station apparatus 400 according to the second embodiment of the present invention, in a multicarrier environment, each frequency band as a connection change target for the terminal apparatus, in particular, another frequency band (for example, the first frequency band) in the same communication network and By applying different threshold values for the A2 event occurrence to each of frequency bands (for example, the second frequency band) of another communication network, the conditions for connection change can be dualized for each frequency band to be changed. In dualizing the change condition, a frequency band with a high data rate can be considered as a connection change target first, thereby enabling a connection change to an optimal frequency band that guarantees the speed and quality of a communication service.

Hereinafter, an operation method of a terminal apparatus and a base station apparatus according to the present invention will be described in detail with reference to FIG. 4 to FIG.

First, a general control flow of a communication system including a terminal apparatus and a base station apparatus according to the first embodiment of the present invention will be described with reference to FIG.

The terminal apparatus 100 and the base station apparatus 300 are interconnected through one specific frequency band among a plurality of different frequency bands (S10).

Hereinafter, for convenience of description, the terminal apparatus 100 and the base station apparatus 300 will be described by referring to a state in which the terminal apparatus 100 and the base station apparatus 300 are interconnected through a specific frequency band which is one of the two frequency bands used in the above-described second communication network. do.

The terminal device 100 continuously measures the signal strength of the serving cell, that is, the signal strength of the base station apparatus 300 received through a specific frequency band (S20).

The terminal device 100 preferably stores frequency bands for each threshold value in which different frequency bands are mapped to each threshold value.

Accordingly, the terminal device 100 determines whether the measured signal strength falls below the first threshold value based on the frequency band for each threshold value (S30), and when the measured signal strength is less than the first threshold value, The base station apparatus 300 may request the base station apparatus 300 to provide policy information for monitoring the signal strength of the first frequency band corresponding to the first threshold value by providing the first A2 event message related to one frequency band to the base station apparatus 300. There is (S40).

At this time, the terminal device 100, the signal strength measured in step S30 is lower than the first threshold value, but not below the second threshold value, that is, the measured signal strength is less than the first threshold value It would be desirable to determine whether it is greater than or equal to two thresholds.

In this case, the base station apparatus 300 checks the first A2 event message provided from the terminal apparatus 100, and transmits policy information (Measurement Gap) to monitor the signal for the first frequency band accordingly. 100) will be provided (S50).

Accordingly, the terminal device 100 monitors the signal strength of the signal received through the first frequency band based on the policy information of the first frequency band (S60), and the signal strength of the first frequency band is currently connected. When a case in which a greater than a certain threshold difference than the signal strength of a specific frequency band is generated, that is, when an A3 event occurs, the A3 event message is reported to the base station apparatus 300 (S65), and then interworking with the base station apparatus 300 is performed. Through a predefined handover procedure or a redirection procedure for the first frequency band, a connection change may be performed from a specific frequency band to the first frequency band.

Meanwhile, the terminal device 100 determines whether an A3 event occurs based on the policy information of the first frequency band, and continuously measures the signal strength of the serving cell, that is, a specific frequency band. It is determined whether the signal strength of the received signal falls below the second threshold (S70).

Accordingly, when the measured signal strength is less than the second threshold value, the terminal device 100 provides the base station apparatus 300 with a second A2 event message related to the second frequency band (S80). Policy information for monitoring the signal strength of the second frequency band corresponding to may be requested to the base station apparatus 300 (S80).

In this case, the base station apparatus 300 checks the second A2 event message provided from the terminal apparatus 100 and transmits policy information (Measurement Gap) to monitor the signal for the second frequency band accordingly. 100) will be provided (S90).

Meanwhile, in steps S30 to S90, the terminal device 100 provides a first A2 event message as the signal strength measured by the terminal device 100 falls below the first threshold value from the first threshold value or more. In this case, the signal strength measured in Equation 2 drops below the second threshold to provide a second A2 event message, but this is only an example.

For example, the signal strength measured by the terminal device 100 may be less than the second threshold value from the beginning.

As such, when the signal strength measured by the terminal device 100 is less than the second threshold value from the beginning, the terminal device 100 measures the determination result of step S70 without performing step S40 of providing the first A2 event message. The second A2 event message related to the second frequency band corresponding to the second threshold value is provided to the base station apparatus 300 in the same manner as the determined signal strength is less than the second threshold value (S80). Policy information for monitoring the signal strength may be provided from the base station apparatus 300 (S90).

Accordingly, the terminal device 100 monitors the signal strength of the signal received through the second frequency band based on the policy information of the second frequency band (S100), and the signal strength of the second frequency band is currently connected. When a case occurs when the signal intensity of a specific frequency band is greater than a certain threshold or more, that is, when an A3 event occurs, the A3 event message is reported to the base station apparatus 300 (S105), and then interworking with the base station apparatus 300 is performed. Through a predefined handover procedure or a redirection procedure for the second frequency band, a connection change may be performed from a specific frequency band to the second frequency band.

Meanwhile, the overall control flow of the communication system including the terminal apparatus and the base station apparatus according to the second embodiment of the present invention will be described with reference to FIG. 5.

The terminal device 200 and the base station device 300 are interconnected through one specific frequency band among a plurality of different frequency bands (S110).

The terminal device 200 continuously measures the signal strength of the serving cell, that is, the signal strength of the base station apparatus 300 received through a specific frequency band (S120).

In addition, the terminal device 200 may report the signal strength continuously measured as described above to the base station apparatus 400 (S130), so that the base station apparatus 400 may check the signal strength reported from the terminal apparatus 200. .

The base station apparatus 400 determines whether the signal strength checked with respect to the terminal apparatus 200 falls below the first threshold value (S140), and when the signal strength is less than the first threshold value, the base station apparatus 400 corresponds to the first threshold value. Policy information (Measurement Gap) for monitoring the signal strength for the first frequency band can be provided to the terminal device (200) (S150).

At this time, the base station apparatus 400, the signal strength confirmed with respect to the terminal device 200 in step S140 is lower than the first threshold value, but not lower than the second threshold value, that is, to the terminal device 200 It may be desirable to determine whether the signal strength checked for the first threshold value is less than the second threshold value.

Accordingly, the terminal device 200 monitors the signal strength of the signal received through the first frequency band based on the policy information of the first frequency band (S160), and the signal strength of the first frequency band is currently connected. When a case occurs when the signal intensity of a specific frequency band is greater than a certain threshold or more, that is, when an A3 event occurs, the A3 event message is reported to the base station apparatus 400 (S165), and then interworking with the base station apparatus 400 is performed. Through a predefined handover procedure or a redirection procedure for the first frequency band, a connection change may be performed from a specific frequency band to the first frequency band.

Meanwhile, the base station apparatus 400 checks whether an A3 event message related to the first frequency band is reported from the terminal apparatus 200, and at the same time, the signal strength confirmed as described above with respect to the terminal apparatus 200 is the second threshold. It is determined whether the value falls below the value (S170).

Thus, the base station apparatus 400, the policy information to monitor the signal strength for the second frequency band corresponding to the second threshold value when the signal strength checked with respect to the terminal device 200 is less than the second threshold value (Measurement Gap) may be provided to the terminal device 200 (S180).

Meanwhile, in steps S140 to S180, the terminal device 200 provides policy information of the first frequency band as the signal strength reported from the terminal device 200 falls below the first threshold value above the first threshold value. The case where the signal strength reported from 200 is lowered below the second threshold to provide policy information of the second frequency band is described, but this is only an example.

For example, the signal strength reported from the terminal device 200 may be less than the second threshold value from the beginning.

As such, when the signal strength reported from the terminal device 200 is less than the second threshold value from the beginning, the base station apparatus 400 determines in step S170 without performing step S150 for providing policy information of the first frequency band. As a result of determining that the signal strength reported from the terminal device 200 is less than the second threshold value, policy information of the second frequency band corresponding to the second threshold value may be provided to the terminal device 200 (S180). .

Accordingly, the terminal device 200 monitors the signal strength of the signal received through the second frequency band based on the policy information of the second frequency band (S190), and the signal strength of the second frequency band is currently connected. When a case occurs when the A3 event is greater than a certain threshold difference than the signal strength of a specific frequency band, that is, when the A3 event occurs, the A3 event message is reported to the base station apparatus 400 (S195), and then the interworking with the base station apparatus 400 is performed. Through a predefined handover procedure or a redirection procedure for the second frequency band, a connection change may be performed from a specific frequency band to the second frequency band.

Hereinafter, an operation method of the terminal according to the first embodiment of the present invention will be described in more detail with reference to FIG.

In the method of operating a terminal device according to the first embodiment of the present invention, a frequency band for each threshold value to which different frequency bands are mapped for each threshold value is stored (S200).

Here, the frequency band for each threshold value may include a first threshold value and a second threshold value smaller than the aforementioned first threshold value.

In this case, the first frequency band mapped to the first threshold value larger than the second threshold value is the same as the second communication network (eg, LTE network) in which a specific frequency band to which the terminal apparatus 100 is currently connected is used. Preferably, the second frequency band mapped to the second threshold value is a first communication network (eg, 3G) different from the second communication network in which the specific frequency band to which the terminal apparatus 100 is currently connected is used. Preferably a frequency band used in the network).

In addition, it is preferable that the data transmission rate of the first frequency band mapped to the first threshold value is faster than the data transmission rate of the second frequency band mapped to the second threshold value.

In addition, the operating method of the terminal apparatus according to the first embodiment of the present invention communicates with the base station apparatus 300 by connecting to the base station apparatus 300 using one specific frequency band among a plurality of different frequency bands. The service can be used (S210).

Hereinafter, for convenience of description, the method of operating the terminal apparatus according to the first embodiment of the present invention, the base station apparatus 300 through a specific frequency band which is one of the two frequency bands used in the second communication network described above. The connection state will be described with reference.

A method for operating a terminal device according to the first embodiment of the present invention, the signal strength of the connected serving cell (Serving Cell), that is, the signal strength of the signal received through a specific frequency band currently connected to the base station apparatus 300 (S220).

In the operating method of the terminal apparatus according to the first embodiment of the present invention, based on the above-described frequency band for each threshold value, it is determined whether the signal strength measured in step S220 falls below the first threshold value (S230), When the signal strength falls below the first threshold value, the base station apparatus 300 requests policy information for monitoring the signal strength of the first frequency band corresponding to the first threshold value (S240).

In this case, in the method of operating the terminal device according to the first embodiment of the present invention, it may be desirable to determine whether the signal strength measured in step S230 is less than the first threshold value and more than the second threshold value.

At this time, the operating method of the terminal device according to the first embodiment of the present invention, by providing a first A2 event message associated with the first frequency band to the base station apparatus 300 to monitor the signal strength for the first frequency band The policy information may be requested to the base station apparatus 300.

That is, the method of operating the terminal device according to the first embodiment of the present invention recognizes that the A2 event for the first threshold occurs when the measured signal strength falls below the first threshold, The first A2 event message including the identifier for identifying the first frequency band corresponding to the first threshold value may be provided to the base station apparatus 300.

In this case, the base station apparatus 300 checks the first A2 event message provided from the terminal apparatus 100, and transmits policy information (Measurement Gap) to monitor the signal for the first frequency band accordingly. 100) will provide.

Accordingly, the method of operating the terminal apparatus according to the first embodiment of the present invention receives the policy information of the first frequency band.

Therefore, the method of operating the terminal apparatus according to the first embodiment of the present invention, based on the policy information of the first frequency band, monitors the signal strength of the signal received through the first frequency band and the signal of the first frequency band It may be determined whether the case where the intensity is greater than a specific threshold difference greater than the signal strength of the specific frequency band currently being accessed, that is, whether an A3 event occurs (S250).

Meanwhile, in the method of operating a terminal device according to the first embodiment of the present invention, the A3 event is determined based on the policy information of the first frequency band, and the above-described continuously measured serving cell (Serving) It is determined whether the signal strength of the cell), that is, the signal strength of the signal received through the specific frequency band falls below the second threshold value based on the frequency band for each threshold value (S260).

Therefore, the method of operating the terminal device according to the first embodiment of the present invention, based on the frequency band for each threshold value, the second frequency band corresponding to the second threshold value when the above-described measured signal strength is less than the second threshold value Request policy information for monitoring the signal strength for the base station apparatus 300 (S270).

At this time, the operation method of the terminal apparatus according to the first embodiment of the present invention, by providing a second A2 event message associated with the second frequency band to the base station apparatus 300 to monitor the signal strength for the second frequency band The policy information may be requested to the base station apparatus 300.

That is, the operating method of the terminal apparatus according to the first embodiment of the present invention recognizes that an A2 event for the second threshold occurs when the measured signal strength falls below the second threshold, The second A2 event message including the identifier for identifying the second frequency band corresponding to the threshold value 2 may be provided to the base station apparatus 300.

In this case, the base station apparatus 300 checks the second A2 event message provided from the terminal apparatus 100 and transmits policy information (Measurement Gap) to monitor the signal for the second frequency band accordingly. 100) will provide.

Accordingly, the method of operating the terminal apparatus according to the first embodiment of the present invention receives the policy information of the second frequency band.

Therefore, the method of operating the terminal device according to the first embodiment of the present invention, based on the policy information of the second frequency band, monitors the signal strength of the signal received through the second frequency band and the signal of the second frequency band It may be determined whether the case where the intensity is greater than a specific threshold difference greater than the signal strength of the specific frequency band currently being accessed, that is, whether an A3 event occurs (S280).

Meanwhile, in the above description, after the first A2 event message is provided as the measured signal strength falls below the first threshold value from the first threshold value or more, the measured signal strength goes below the second threshold value and the second A2 event is performed. Although the case of providing a message has been described with reference to, this is only an example.

For example, the signal strength measured in step S220 may be less than the second threshold from the beginning.

When the signal strength measured as described above is less than the second threshold value from the beginning, the method of operating the terminal device according to the first embodiment of the present invention may provide a first threshold value corresponding to the second threshold value without providing the first A2 event message. The A2 event message related to the second frequency band may be provided to the base station apparatus 300 to request and receive policy information of the second frequency band to monitor the signal strength of the second frequency band to the base station apparatus 300. have.

Hereinafter, an operation method of the base station apparatus according to the second embodiment of the present invention will be described in more detail with reference to FIG. 7.

In the operation method of the base station apparatus according to the second embodiment of the present invention, the terminal apparatus 200 can use the communication service by connecting to the terminal apparatus 200 using one specific frequency band among a plurality of different frequency bands. (S300).

Hereinafter, for convenience of description, the method of operating the base station apparatus according to the second embodiment of the present invention, the terminal apparatus 200 through a specific frequency band which is one of the two frequency bands used in the second communication network described above. The connection state will be described with reference.

In the operating method of the base station apparatus according to the second embodiment of the present invention, the connected terminal apparatus 200 checks the signal strength of a signal that is received through a specific frequency band.

For example, the terminal device 200 continuously connects the signal strength of a serving cell, that is, the signal strength of a signal received through a specific frequency band, while being connected to the base station apparatus 400 through a specific frequency band. The measurement can be reported to the base station apparatus.

Thus, the operation method of the base station apparatus according to the second embodiment of the present invention can receive and confirm the signal strength measured from the terminal apparatus 200 (S310).

In operation method of the base station apparatus according to the second embodiment of the present invention, it is determined whether the signal strength of the confirmed terminal device 200 falls below the first threshold value (S320), and the signal strength is less than the first threshold value. In the case of going down to S1, policy information (Measurement Gap) for monitoring the signal strength of one first frequency band corresponding to the first threshold value may be provided to the terminal device 200 (S330).

In this case, in the operation method of the base station apparatus according to the second embodiment of the present invention, it is preferable to determine whether the signal strength checked with respect to the terminal apparatus 200 in step S320 is less than the first threshold value or more than the second threshold value. something to do.

Accordingly, the terminal device 200 monitors the signal strength of a signal received through the first frequency band based on the policy information of the first frequency band, and the signal strength of the first frequency band of the specific frequency band currently connected. It may be determined whether a case where a specific threshold difference is greater than a signal strength occurs, that is, whether an A3 event occurs.

On the other hand, the operation method of the base station apparatus according to the second embodiment of the present invention, the A3 event message related to the first frequency band is reported from the terminal device 200, and at the same time, the signal continuously received / confirmed in step S310 It is determined whether the intensity falls below the second threshold (S340).

Accordingly, in the method of operating the base station apparatus according to the second embodiment of the present invention, when the signal strength confirmed by the terminal apparatus 200 is less than the second threshold value, the signal for the second frequency band corresponding to the second threshold value is used. Policy information (Measurement Gap) for monitoring the strength can be provided to the terminal device (200) (S350).

Accordingly, the terminal device 200 monitors the signal strength of a signal received through the second frequency band based on the policy information of the second frequency band, and the signal strength of the second frequency band of the specific frequency band currently connected. It may be determined whether a case where a specific threshold difference is greater than a signal strength occurs, that is, whether an A3 event occurs.

Meanwhile, in the above description, after the first A2 event message is provided as the signal strength of the checked terminal device 200 decreases from the first threshold value to less than the first threshold value, the signal strength of the checked terminal device 200 is set to zero. A case where the second A2 event message is lowered below the threshold value is provided and described. However, this is only an example.

For example, the signal strength of the terminal device 200 identified in step S310 may be less than the second threshold value from the beginning.

When the signal strength of the terminal device 200 confirmed as described above is less than the second threshold from the beginning, the operation method of the base station device according to the second embodiment of the present invention, the policy information of the first frequency band to the terminal device 200 Without providing the information, the terminal apparatus 200 may provide the policy information of the second frequency band corresponding to the second threshold value.

Here, the first threshold value described above is greater than the second threshold value described above, and the first frequency band mapped to the first threshold value greater than the second threshold value is currently connected to the terminal apparatus 200 and the base station apparatus. Preferably, the frequency band used in the same second communication network (eg, LTE network) as the second communication network in which a specific frequency band is used, and the second frequency band mapped to the second threshold is the terminal device 200 and the base station device. Is preferably a frequency band used in a first communication network (for example, 3G network) different from the second communication network in which a specific frequency band currently being accessed is used.

In addition, it is preferable that the data transmission rate of the first frequency band mapped to the first threshold value is faster than the data transmission rate of the second frequency band mapped to the second threshold value.

As described above, according to the operating method of the terminal apparatus and the base station apparatus according to the present invention, in a multicarrier environment, each frequency band as a connection change target for the terminal apparatus, in particular, another frequency band in the same communication network (for example, the first frequency) Band) and each of the frequency bands (e.g., the second frequency band) of the other communication network, by applying different threshold values for the A2 event occurrence to dualize the conditions for the connection change for each frequency band to which the connection is to be changed. In addition, in dualizing connection change conditions, a frequency band with a high data transmission rate can be considered as a connection change target first, thereby making it possible to change the connection to an optimal frequency band that guarantees the speed and quality of the communication service.

The method of operating a base station apparatus and a method of operating a terminal apparatus according to an embodiment of the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

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, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

According to an embodiment of the present invention, a terminal apparatus, a base station apparatus, and a method of operating the apparatuses provide a method for improving the speed and quality of a communication service by dualizing a condition for changing a connection for each frequency band as a connection change target for a terminal apparatus in a multicarrier environment. Overcoming the limitations of existing technology in that connection changes can be made to the optimal frequency bands that are guaranteed, not only the use of the related technology but also the possibility of commercial or commercial application of the applied device is not only sufficient but also realistically implemented. It is an invention with industrial applicability since it can be done.

100, 200:
300, 400: base station device

Claims (13)

A connection unit for connecting to the base station using a specific frequency band;
A signal strength measuring unit measuring signal strength of a signal received through the specific frequency band; And
If the measured signal strength is less than the first threshold value, the signal strength of one first frequency band mapped to the first threshold value is calculated based on the frequency band for each threshold value that maps different frequency bands for each threshold value. Request policy information for monitoring, and if the measured signal strength is less than the second threshold value less than the first threshold value, monitor the signal strength for the other second frequency band to which the second threshold value is mapped. Request policy information, and if the measured signal strength is less than the first threshold value, considering only the first frequency band as a connection change target according to the policy information of the first frequency band, and the measured signal strength is set to the first threshold value. If less than 2 thresholds, the request unit for considering only the second frequency band as a connection change target according to the policy information of the second frequency band Terminal device comprising a.
delete The method according to claim 1,
And a data transmission rate of the first frequency band is faster than a data transmission rate of the second frequency band. The method according to claim 1,
And the first frequency band is used in the same communication network as the communication network in which the specific frequency band is used, and the second frequency band is used in a communication network different from the communication network in which the specific frequency band is used. The method according to claim 1,
The request unit,
Providing the first base station (A2) event message associated with the first frequency band to the base station or providing the second base station (A2) event message related to the second frequency band to the base station, And requesting policy information of a band or policy information of the second frequency band. A connection unit connecting to the terminal using a specific frequency band; And
A signal strength checking unit for checking the signal strength of a signal received by the terminal through the specific frequency band;
When the checked signal strength is less than the first threshold, the terminal provides policy information for monitoring the signal strength of one first frequency band corresponding to the first threshold, and the checked signal strength is the first. If less than the second threshold value less than the threshold value provides the policy information for monitoring the signal strength of the other second frequency band corresponding to the second threshold value to the terminal, the confirmed signal strength is the second If less than 1 threshold, the terminal considers only the first frequency band as a connection change target according to the policy information of the first frequency band, and if the checked signal strength is less than the second threshold, the second frequency band at the terminal. A policy information providing unit for considering only the second frequency band as a connection change target according to the policy information of Base station apparatus, characterized in that.
delete The method according to claim 6,
And a data transmission rate of the first frequency band is faster than a data transmission rate of the second frequency band. The method according to claim 6,
And the first frequency band is used in the same communication network as the communication network in which the specific frequency band is used, and the second frequency band is used in a communication network different from the communication network in which the specific frequency band is used. An access step for accessing a base station using a specific frequency band;
A signal strength measuring step of measuring signal strength of a signal received through the specific frequency band; And
If the measured signal strength is less than the first threshold value, the signal strength of one first frequency band mapped to the first threshold value is determined based on the frequency band for each threshold value that maps different frequency bands for each threshold value. Request policy information for monitoring, and if the measured signal strength is less than the second threshold value less than the first threshold value, monitor the signal strength for the other second frequency band to which the second threshold value is mapped. Request policy information, and if the measured signal strength is less than the first threshold value, considering only the first frequency band as a connection change target according to the policy information of the first frequency band, and the measured signal strength is set to the first threshold value. A request step for considering only the second frequency band as a connection change target according to the policy information of the second frequency band when it is less than two thresholds; Method of operating a terminal device which is characterized in that it comprises.
delete 11. The method of claim 10,
The requesting step,
Providing the first base station (A2) event message associated with the first frequency band to the base station or providing the second base station (A2) event message related to the second frequency band to the base station, Requesting policy information of a band or policy information of the second frequency band. An access step of accessing the terminal using a specific frequency band;
A signal strength checking step of checking a signal strength of a signal received by the terminal through the specific frequency band; And
When the checked signal strength is less than the first threshold, the terminal provides policy information for monitoring the signal strength of one first frequency band corresponding to the first threshold, and the checked signal strength is the first. If less than the second threshold value less than the threshold value provides the policy information for monitoring the signal strength of the other second frequency band corresponding to the second threshold value to the terminal, the confirmed signal strength is the second If less than 1 threshold, the terminal considers only the first frequency band as a connection change target according to the policy information of the first frequency band, and if the checked signal strength is less than the second threshold, the second frequency band at the terminal. A policy information providing step of considering only the second frequency band as a connection change target according to the policy information of Method of operating a base station apparatus, characterized in that.

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