KR101625212B1 - multi-mode mobile terminal and method for selecting network mode in the terminal - Google Patents

Abstract

A method for determining a mode in a multi-mode mobile communication terminal, the method comprising: receiving network information in a connected state periodically; calculating a static user satisfaction degree based on received network information in a connected state; Calculating a static user satisfaction level for the candidate networks if the static user satisfaction level for the network in the state is less than or equal to a threshold value, selecting one of the candidate networks based on the calculated static user satisfaction level and the static user satisfaction level for the candidate networks And performing a handover to a selected candidate network. The method of determining a mode of a multi-mode mobile communication terminal according to claim 1, Decisively . As a result, power consumption can be reduced and an optimal network can be selected in the current user's communication environment.

Multimode, mobile terminal, mode decision, satisfaction

Description

[0001] The present invention relates to a multi-mode mobile communication terminal,

The present invention relates to a multimode mobile communication terminal, and more particularly, to a mode determination method in a multimode mobile communication terminal.

The present invention is derived from research carried out as part of the IT original technology development project of the Ministry of Knowledge Economy. [National Administration Number: 2008-F-001-02, Title: Environment Adaptive Self- Research]

The mobile communication terminal can be implemented to perform various functions. Here, various functions performed by the mobile communication terminal include, for example, data and voice communication functions, a function of photographing a picture or a moving picture through a camera, a voice storage function, a music file playback function, and an image or video display function. In addition, a recent mobile communication terminal can receive and reproduce a multicast signal, and it is also possible to provide a viewing function of a television program or a video.

In recent years, networks capable of performing communication using mobile communication terminals have been diversified. Therefore, research is being conducted on mobile communication terminals capable of performing communication using various networks.

Currently, the commercial dual mode mobile communication terminal selects a network having a higher priority when the received signal is higher than a threshold value. However, in order to guarantee user satisfaction with the service, consideration should be given not only to the received signal but also to the quality of service (QoS) of the receiving service, the current load state of the network, or the user's preference information for each service. Based on these demands, research on network selection method based on multiple criteria has been actively carried out. These studies generally involve a method of triggering network selection if the QoS or received signal strength of the receiving service falls below a threshold.

The present invention provides a network search method that reduces the amount of power consumed in determining a network search point and a network selection trigger point and enables communication through an optimal network in a user environment .

According to another aspect of the present invention, there is provided a method for providing a service to a candidate network, the method comprising: periodically receiving network information in a connected state; calculating a static user satisfaction based on the network information in the connected connection state; Selecting one of the candidate networks based on the calculated static user satisfaction and the static user satisfaction for the candidate networks, and performing handover to the selected candidate network, Mode mobile communication terminal.

According to the present invention, it is possible to determine a network search point and a selection point in order to improve user satisfaction in the multimode mobile communication terminal. As a result, power consumption can be reduced and an optimal network can be selected in the current user's communication environment.

Specifically, when the dynamic user satisfaction is high and the static user satisfaction is high, the user turns off the network search module because he wants to maintain the connection in the current network. Therefore, unnecessary network search is not performed, and battery waste of the terminal can be prevented.

In the case where the dynamic user satisfaction is high and the static user satisfaction is low, the user search can be further improved by performing the network search only for the candidate network with high static user satisfaction. Even if the dynamic user satisfaction is good considering the received signal strength of the current network, the QoS of the service, and the remaining battery level, if the static user satisfaction is lowered in terms of price and user preference, , Battery wastage can be prevented by triggering network selection only when dynamic user satisfaction has risen above a threshold.

That is, it is possible to maximize the satisfaction of the user by determining the network selection point in consideration of both the dynamic user satisfaction and the static user satisfaction.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and further aspects of the present invention will become more apparent from the following description of the preferred embodiments with reference to the attached drawings. Hereinafter, the present invention will be described in detail in order that those skilled in the art can easily understand and reproduce the present invention through these embodiments.

1 is a block diagram of a multimode mobile communication terminal according to an exemplary embodiment of the present invention. 1, a multimode mobile communication terminal according to an exemplary embodiment of the present invention includes a terminal measurement unit 100, a network information receiving unit 110, a network search unit 130, a satisfaction calculation unit 120, a network search control unit 140, and a network selection unit 150.

The terminal measurement unit 100 measures the overall operation state of the multimode mobile communication terminal. In one embodiment, the terminal measurement unit 100 measures a moving speed, a received signal strength of a currently connected network, a service QoS level, battery capacity information, and the like.

The network information receiving unit 110 receives the network information of the area currently located according to the location information of the multimode mobile communication terminal. When the multimode mobile communication terminal is located in an area where multiple networks are overlaid, the network information receiving unit 110 receives multiple network information. When the multimode mobile communication terminal is located in a region where only a single network is located, the mobile communication terminal receives the single network information. In one embodiment, the network information includes information such as the location of the network, the radius, the received signal strength, the degree of load, and the service use price.

The network search unit 130 measures a received signal strength from a specific network at a location of the multimode mobile communication terminal based on the network configuration information received by the network information receiver 110. [ Then, based on the measured received signal strength, it is confirmed whether the actual service is available through the network.

The satisfaction calculation unit 120 calculates the user satisfaction with respect to the currently receiving network and other available candidate networks.

The network search control unit 140 controls the search operation of the network search unit 130 based on the user satisfaction information calculated by the satisfaction calculation unit 120. [

The network selection unit 150 determines the user satisfaction of the network currently being serviced and the user satisfaction of other communicable networks based on the calculation result of the satisfaction calculation unit 120. [ Then, the network selection is controlled based on the identified user satisfaction information. In one embodiment, the multimode mobile communication terminal is connected to a network selected by the network selection unit 150 and is provided with a service.

Hereinafter, a method for calculating the user satisfaction in the satisfaction calculating unit 120 will be described in more detail.

For example, suppose a multimode mobile communication terminal is capable of communicating over three networks: UMTS, WiMAX, and WLAN. Service users generally want to use good quality services at low prices. In general, UMTS, WiMAX, and WLAN support high-speed data services in the following order. However, the higher the price efficiency, the lower the coverage and mobility support. Therefore, even if a user wants high-speed service at a low price, he or she should use UMTS or WiMAX in a place that is not moving in a hot spot or a hot spot where a wireless LAN access service is available.

When the preferred air interface is available in the wireless environment of the multi-mode mobile communication terminal, the service user will attempt handover to the preferred air interface. At this time, the user may desire to select a network that satisfies the preference preference among the communication environment specifications such as the service utilization price, the data transmission rate, and the reliability. In this way, the user preference that is applied differently for each user can be defined as the static user satisfaction. However, as a result of considering the current wireless environment and the network resource status of the user, it may be impossible to communicate using a network in which the service user has a high degree of static satisfaction. For example, the received signal strength is not sufficient, or the network load is too high, or the mobile speed is not supported. What is applied in this case is defined as dynamic user satisfaction.

The satisfaction calculator 120 according to an aspect calculates a static user satisfaction level and a dynamic user satisfaction level for a network and a candidate network that are currently being serviced, and based on the information, the network selector 150 selects a multi- And network selection triggers.

이라 하고, 연결된 네트워크에 대한 절대적 사용자 만족도 레벨을

이라 하고, 후보 네트워크에 대한 동적인 사용자 만족도 레벨을 이라 하고, 후보 네트워크에 대한 절대적 사용자 만족도 레벨을

이라한다. Hereinafter, the user satisfaction level (User Satisfaction Level) is denoted by the abbreviation 'USL'. And the dynamic user satisfaction level for the connected network.

And an absolute user satisfaction level for the connected network.

And a dynamic user satisfaction level for the candidate network , And the absolute user satisfaction level for the candidate network

Quot;

The description of each parameter is as follows.

Criteria Explanation
Dynamic information Signal Quality: S (t) The signal level received at the terminal Mobile velocity: v (t) Movement speed of terminal Load: ρ (t) RAN load Battery Lifetime: L (t) Lifetime of terminal
Static
Information Cost: C Cost of RAN Throughput: T The typical throughput provided by the RAN Reliability: R Reliability provided by RAN User Preference: UP User preference for RAN

Here, the dynamic information is information that is dynamically changed according to the current wireless communication environment, the moving speed, the number of connected users of the RAN (radio access network), and the load of the multimode mobile communication terminal. And static criteria are information that is determined by the characteristics of the user or RAN and does not change unless the user or the RAN operator re-sets the value.

The parameters for calculating the dynamic user satisfaction level and the static user satisfaction level are as follows.

USL Criteria  ( serving RAN ) USL Criteria  ( candidate RAN )

Signal Quality: S (t)

Signal Quality: S (t) QoS: Q (t) Mobility: v (t) Load: ρ (t) Battery Lifetime: L (t) Battery Lifetime: L (t)

Cost: C

Cost: C Throughput: T Throughput: T Reliability: R Reliability: R User Preference: UP User Preference: UP

In order to calculate user satisfaction for each parameter, the following calculation procedure is performed.

Equations (1) and (2) are for calculating how each parameter value satisfies the requirement. If the parameter value satisfies the requirement 100%, the result value becomes 1. If the parameter value does not satisfy the highest requirement, the result value becomes 0.

는 네트워크 i에 대하여 네트워크 선택 파라미터 X측면에서 최소 요구하는 임계치 값이다. 예를 들어 Single Quality의 경우 통신을 위한 최소 신호 퀄리티(Signal Quality) 레벨이다. u (X) is a utility calculated value for network selection parameter X for network i. Where 0? U (X)? 1. And

Is the minimum required threshold value in terms of network selection parameter X for network i. For example, in case of Single Quality, it is the minimum signal quality level for communication.

는 네트워크 i에 대하여 네트워크 선택 파라미터 X 측면에서 선호하는 임계치 값이다. 예를 들어 가장 높은 AMC 모드와 같은 최적의 모드로 동작하기 위해 필요한 신호 퀄리티(Signal Quality) 레벨 혹은 사용자가 선호하는 서비스 비용에 대한 임계치 비용(cost)일 수 있다.

Is a preferred threshold value in terms of network selection parameter X for network i. For example, a signal quality level required to operate in an optimal mode such as the highest AMC mode, or a threshold cost for a user's preferred service cost.

는 네트워크 i에 대하여 네트워크 선택 파라미터 X 측면에서 허용하는 최대 임계치 값이다. 각 네트워크마다 지원 가능한 최대 이동 속도, 사용자가 최대로 지불할 것으로 예상되는 최대 서비스 비용을 의미한다.

Is the maximum threshold value allowed in terms of network selection parameter X for network i. The maximum movement speed that can be supported for each network, and the maximum service cost that the user is expected to pay maximum.

는 멀티 모드 이동통신 단말기의 무선 환경과 네트워크 환경에 따라 동적으로 변화하는 사용자 만족도 레벨이다. 일 실시예에 있어서,

값은 아래 수학식을 통해 산출할 수 있다.And

Is a user satisfaction level that changes dynamically according to the wireless environment and the network environment of the multimode mobile communication terminal. In one embodiment,

The value can be calculated by the following equation.

Where W _s is the signal quality, W _Q is the QoS information, and Q _L is the battery lifetime.

은 사용자에 의해 정해진 정적인 사용자 만족도 레벨이다. 일 실시예에 있어서

값은 아래 수학식을 통해 산출될 수 있다.

Is a static user satisfaction level determined by the user. In one embodiment

The value can be calculated by the following equation.

Where W _C is the service usage cost, W _T is the data throughput W _R And W _UP is a user preference.

는 후보 네트워크 i에 대하여 단말의 무선 환경과 네트워크의 환경에 따라 동적으로 변하는 사용자 만족도 레벨이다. 일 실시예에 있어서

값은 아래 수학식을 통해 산출될 수 있다.

Is a user satisfaction level that dynamically changes with respect to the candidate network i according to the wireless environment of the terminal and the environment of the network. In one embodiment

The value can be calculated by the following equation.

Where W _S is the signal quality, W _V is the mobile velocity, W _ρ is the load and W _L is the battery lifetime.

는 후보 네트워크 i에 대하여 사용자에 의해 정해진 정적인 사용자 만족도 레벨이다. 일 실시예에 있어서,

값은 아래 수학식을 통해 산출될 수 있다.

Is a static user satisfaction level determined by the user for the candidate network i. In one embodiment,

The value can be calculated by the following equation.

Where W _C is the service usage cost, W _T is the data throughput W _R And W _UP is a user preference. These values vary depending on the characteristics of each network and service requirements.

According to a further aspect, the weight between each parameter can be applied to a value defined by the user. For example, when using data services, some users may consider pricing the most. Or some users may consider reliability as the most important factor regardless of price. This weighting information is defined by the user as a user preference for the service.

FIG. 2 is a graph illustrating a state definition of a user satisfaction level according to an exemplary embodiment of the present invention. Referring to FIG. As shown in FIG. 2, the USL is divided into a good state and a degradation state based on a predefined threshold.

Each USL is calculated based on the range of values required by the user and the maximum / minimum allowable values for each parameter. In one embodiment, the threshold represents an average percentage of users who are satisfied with the user satisfaction. Therefore, the threshold can be set within the range of 0 to 100%. For example, if you set it to 90%, it means that the average of 90% is satisfied according to the requirement of each parameter.

3 is a flowchart illustrating a network search method according to an exemplary embodiment.

First, determine the state of the dynamic user satisfaction level. Referring to FIG. 2, the user satisfaction level value can be determined as a good state if the user satisfaction level is higher than a specific threshold value and a degradation state when the user satisfaction level value is lower than a specific threshold value.

)가 저하된 경우(300), 즉시 네트워크 탐색 모듈을 ON하여, 사용 가능한 네트워크를 탐색한다(350). Dynamic user satisfaction (

(300), the network search module is immediately turned on to search for a usable network (350).

)도 좋은 상태인 경우(310)에는, 사용자가 현재 네트워크에서의 연결 유지를 원하므로, 네트워크 탐색 모듈을 OFF(340)한다. 이에 따라 사용자가 서비스 이용에 만족하는 경우에는 불필요한 네트워크 탐색을 수행하지 않음으로써 단말기의 배터리 낭비를 방지할 수 있다. And dynamic user satisfaction is good, and static user satisfaction (

(310), the user desires to maintain the connection in the current network, and turns off the network search module (340). Accordingly, when the user is satisfied with the use of the service, the unnecessary network search is not performed, so that battery waste of the terminal can be prevented.

)를 계산한다(320). 그리고 현재 연결된 네트워크의 사용자 만족도 보다 Δ 이상 더 높은 정적인 사용자 만족도를 가지는 후보 네트워크가 존재하는 경우(330), 즉시 네트워크 탐색 모듈을 온(ON)한다(350). 여기서Δ는 핑퐁 효과(ping-pong effect)를 막기 위한 한계 값(margin value)이다. 그리고 사용 가능한 네트워크를 탐색한다. 즉, 현재 네트워크에서 이동 속도(Mobile Velocity), 서비스의 QoS 정보, 그리고 배터리 수명시간(Battery Lifetime) 측면의 동적 사용자 만족도가 좋은 상태이더라도, 정적인 사용자 만족도가 더 높은 후보 네트워크가 존재하는 경우에 대하여 네트워크 탐색을 수행한다. 이에 따라 사용자 만족도를 향상시키는 효과가 있다. 또한, 정적인 사용자 만족도가 높은 후보 네트워크에 대해서만 네트워크 탐색을 수행함으로써, 단말기의 배터리 낭비를 방지할 수 있다.In a case where the dynamic user satisfaction is good (300) and the static user satisfaction is low (310), the static user satisfaction

(320). If there is a candidate network having a static user satisfaction higher than the user satisfaction level of the currently connected network 330, the network search module is immediately turned on 350. Where Δ is a margin value to prevent the ping-pong effect. And browse available networks. That is, even if the dynamic user satisfaction is good in terms of the mobile speed, the QoS information of the service, and the battery lifetime in the current network, a case where there is a candidate network having a higher static user satisfaction Perform network discovery. Accordingly, there is an effect of improving the user satisfaction. In addition, by performing a network search only for a candidate network having a high static user satisfaction, battery waste of the terminal can be prevented.

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

)가 어느 정도 임계치 이상인 좋은 상태이고(400), 정적인 사용자 만족도(

)도 어느 정도 만족 상태인 경우(410), 현재 네트워크 연결 유지를 원하므로, 네트워크 선택 제어모듈은 종료된다.First, dynamic user satisfaction (

) Is in a good state with a certain threshold value or higher (400), static user satisfaction (

(410), the network selection control module is terminated because it is desired to maintain the current network connection.

)가 좋은 상태이고(400), 정적인 사용자 만족도가 저하된 상태인 경우(410), 현재 정적인 사용자 만족도보다 더 높은 정적인 사용자 만족도를 가지는 후보 네트워크에 대하여 동적인 사용자 만족도(

)를 계산한다(412).On the other hand, dynamic user satisfaction (

) Is good 400 and if the static user satisfaction level is low 410 the dynamic user satisfaction level for a candidate network having a higher static user satisfaction level than the current static user satisfaction level

(412).

Then, if there is a candidate network matching the user satisfaction (414), the network selection is triggered and a handover to the network with higher user satisfaction is attempted (430).

At this time, whether or not a candidate network exists can be determined by the following equation.

Accordingly, the multi-mode mobile communication terminal has a higher static user satisfaction level and a higher dynamic user satisfaction level even though the mobile user experience is good, such as the mobile speed, the QoS information of the service, and the battery lifetime, When there is a high candidate network satisfying the satisfaction level, a handover to a new network is attempted. Therefore, there is an effect of improving the user satisfaction. Also, by adjusting the threshold of dynamic user satisfaction that adaptively selects the candidate network according to the dynamic user satisfaction of the current network, it is possible to effectively select the handover point to the network appropriate to the current situation of the terminal.

If the dynamic user satisfaction is low 400, the dynamic user satisfaction is calculated 420 for a candidate network having a higher dynamic user satisfaction than the current dynamic user satisfaction of the network. If there is a candidate network satisfying the user satisfaction (425), the network selection is triggered and a handover to the network with higher user satisfaction is attempted (430).

At this time, whether or not a candidate network exists can be determined by the following equation.

Where Δ is a margin value to prevent the ping-pong effect.

The multimode mobile communication terminal adjusts a dynamic user satisfaction threshold that adaptively selects a candidate network according to the dynamic user satisfaction of the current network when the current dynamic satisfaction level of the network decreases. Therefore, it is possible to effectively select the handover point to the network appropriate to the current situation of the terminal.

That is, the network search condition and the network selection trigger condition of the terminal according to the user satisfaction with respect to the network that is currently connected are summarized in Table 3 below.

Network search conditions Select Network trigger  Condition Good Good I want to maintain my current network none Good Deg. Start a new network search

Deg. Good USL initiates higher network discovery

Deg. Deg. Start a new network search

5 is a flowchart of a mode determination method of a multimode mobile communication terminal according to an embodiment.

)의 업데이트를 수행한다(505). 이때, 단말 측정 절차는 현재 단말의 수신 신호의 품질, QoS, 배터리 잔량 등의 측정 정보 측정하는 과정들을 포함한다. 그리고 현재 연결된 네트워크의 동적 사용자 만족도(

)가 저하되었는지 판단한다(510). First, the UE periodically performs a UE measurement procedure and a network information reception procedure according to a measurement timer (500). And dynamic user satisfaction (

(Step 505). At this time, the terminal measurement procedure includes the measurement information of the quality of the received signal of the current terminal, the QoS, and the remaining battery level. And the dynamic user satisfaction of the currently connected network (

(510).

If the dynamic user satisfaction is degraded, the network selection trigger condition is checked by performing the network search procedure immediately.

를 계산한다(560). 그리고 도 4 를 참조하여 전술한 네트워크 선택 방법에 의해 트리거 조건을 만족하는 후보 네트워크를 선택한다(570, 580). 이 후에 단말 재구성 및 접속 절차를 수행하여 새로운 네트워크로의 핸드오버를 시도한다(590).Specifically, a network search procedure is performed (540), and if a candidate candidate network exists (550)

(560). The candidate network satisfying the trigger condition is selected by the network selection method described above with reference to FIG. 4 (570, 580). Thereafter, a handover to a new network is attempted by performing a terminal reconfiguration and connection procedure (590).

)가 좋은 상태이면, 정적 사용자 만족도(

)가 저하된 상태인지 판단한다(515). 정적 사용자 만족도도 좋은 상태이면, 사용자는 현 상태 유지를 원하므로 네트워크 탐색 모듈을 OFF하고 초기 상태로 되돌아간다. 하지만 정적 사용자 만족도가 저하된 상태이면, 수신한 네트워크 배치 정보를 바탕으로 후보 네트워크에 대하여 정적 사용자 만족도를 계산한다(520). On the other hand, dynamic user satisfaction (

) Is in good condition, the static user satisfaction (

(Step 515). If the static user satisfaction is also good, the user wants to keep the current state, and turns off the network search module and returns to the initial state. However, if the static user satisfaction level is low, the static user satisfaction level is calculated for the candidate network based on the received network configuration information (520).

If there is a candidate network having a static user satisfaction level higher than the static user satisfaction level of the currently connected network (530), a network search module is immediately turned on to check the RAN selection trigger condition, And a connection procedure to attempt handover to a new network (540, 550, 560, 570, 580, 590). On the other hand, if there is no candidate network in which the static user satisfaction level is higher than the static user satisfaction level of the currently connected network (530), the network search module is turned off and returned to the initial state.

Meanwhile, the mode determination method of the multimode mobile communication terminal described above can be written in a computer program. Also, the program may be stored in a computer-readable medium, readable and executed by a computer, and executed. The storage medium includes a magnetic recording medium, an optical recording medium, and the like.

The present invention has been described above with reference to the preferred embodiments. 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. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

1 is a block diagram of a multimode mobile communication terminal according to an embodiment.

2 is a graph illustrating a state definition of a user satisfaction level according to an embodiment,

3 is a flowchart illustrating a network search method according to an exemplary embodiment;

4 is a flowchart illustrating a network selection method according to an embodiment of the present invention,

5 is a flowchart of a mode determination method of a multimode mobile communication terminal according to an embodiment.

Claims (10)

Obtaining dynamic information and static information used for network selection through measurement of a terminal and reception of information from multiple networks; The dynamic information including the current wireless communication environment, the moving speed, the number of users connected to the RAN (radio access network) and the load of the multi-mode mobile communication terminal belonging to multiple networks and the characteristics of the user or the RAN Calculating dynamic user satisfaction and static user satisfaction with static information that is not changed before the user-initiated RAN administrator resets ; Determining whether or not to search for a network according to a result of user satisfaction calculation for the connected network; Searching for a candidate network according to the determination; Calculating a dynamic user satisfaction for the searched candidate network; And Communicating with the candidate network if the calculated dynamic user satisfaction of the candidate network satisfies the trigger condition; Wherein the mobile communication terminal is a mobile communication terminal. 2. The method of claim 1, wherein determining whether to search for a network comprises: Determining a network search if the dynamic user satisfaction level for the connected network is lower than a threshold; Wherein the mobile communication terminal is a mobile communication terminal. 2. The method of claim 1, wherein determining whether to search for a network comprises: Comparing the static user satisfaction level of the connected network with the static user satisfaction level of the candidate network if the dynamic user satisfaction level for the connection network is higher than the threshold value and the static user satisfaction level is lower than the threshold value; And Determining a network search if the static user satisfaction level for the candidate network is higher than the margin value for the static user satisfaction level for the connection network; Wherein the mobile communication terminal is a mobile communication terminal. 3. The method of claim 2, Wherein the trigger condition is that the dynamic user satisfaction level for the candidate network is greater than the margin value for the dynamic network level for the connected network. The method of claim 3, Wherein the trigger condition is that the dynamic user satisfaction for the candidate network is greater than the smaller of the dynamic user satisfaction for the connected network and the threshold for the dynamic user satisfaction. A terminal measurement unit for measuring information used for network selection; A network information receiving unit for receiving network information used for network selection from multiple networks; The dynamic information including the current wireless communication environment, the moving speed, the number of users connected to the RAN (radio access network), and the load of the multimode mobile communication terminal obtained by the terminal measuring unit and the network information receiving unit, A satisfaction calculating unit for calculating dynamic user satisfaction and static user satisfaction per network with static information that is not changed before resetting by a user-friendly RAN manager including characteristics ; A network search unit searching a candidate network; A network search control unit for activating a network search unit according to dynamic user satisfaction and a static user satisfaction calculation result for the connection network of the satisfaction calculation unit; And A network selector for selecting the candidate network as a communication network when the dynamic user satisfaction of the searched candidate network satisfies a trigger condition; The mobile communication terminal comprising: The method according to claim 6, And the network search control unit activates the network search unit when the dynamic user satisfaction level for the connection network is lower than the threshold value. The method according to claim 6, If the dynamic user satisfaction level for the connection network is higher than the threshold value and the static user satisfaction level is lower than the threshold value, the network search control unit compares the static user satisfaction level with the candidate network and the static user satisfaction level with the candidate network. And activates the network search unit if the satisfaction level is higher than the threshold value of the static user satisfaction level for the connection network. 8. The method of claim 7, Wherein the trigger condition is that the dynamic user satisfaction for the candidate network is greater than the threshold for dynamic user satisfaction for the connection network. 9. The method of claim 8, Wherein the trigger condition is that the dynamic user satisfaction for the candidate network is greater than the smaller of the dynamic user satisfaction for the connected network and the threshold for the dynamic user satisfaction.

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