WO2021112264A1

WO2021112264A1 - Electronic apparatus and hand over method for same

Info

Publication number: WO2021112264A1
Application number: PCT/KR2019/016819
Authority: WO
Inventors: 추상민; 김주성; 김보수
Original assignee: 엘지전자 주식회사
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2021-06-10

Abstract

The present invention relates to an electronic apparatus supporting 5G communication, and more specifically, to a hand over of the electronic apparatus. An electronic apparatus according to an embodiment of the present invention is characterized by comprising: a memory which includes information about RF bands supportable by the electronic apparatus; a detection unit which detects the movement speed of the electronic apparatus; and a modem which, when the detected movement speed of the electronic apparatus exceeds a preset speed, changes a list of the RF bands supportable by the electronic apparatus so that at least one of the RF bands supportable by the electronic apparatus is excluded, and changes the RF bands, which are supportable by the electronic apparatus and registered to a base station, by transmitting the modified RF band list to the base station through a support function change request so that the base station performs a hand over according to the changed RF bands.

Description

Electronic device and handover method of the electronic device

The present invention relates to an electronic device supporting 5G communication, and more particularly, to a hand over of the electronic device.

Recently, various electronic devices including electronic devices have been commercialized as wireless communication systems using LTE communication technology to provide various services. In addition, it is expected that a wireless communication system using 5G communication technology will be commercialized in the future to provide various services. Meanwhile, some of the LTE frequency bands may be allocated to provide 5G communication services.

When such an electronic device is registered with a base station to provide a communication service, the base station (service base station) selects RF frequencies that the electronic device can support, that is, RF band frequencies according to information provided from the electronic device. You can register and set conditions for handover.

In addition, when the preset handover condition is satisfied, such as when the signal strength is lower than a preset threshold according to the movement of the electronic device, the service base station may access the electronic device based on RF band frequencies supported by the electronic device. It is possible to transmit information of other adjacent base stations to the electronic device, and in response to this, the electronic device measures the signal strength received by each base station and transmits it to the service base station (measurement report), the service base station receives the received signal from the electronic device A suitable base station is determined based on the signal strength information and the network state, and the electronic device is registered with the determined base station, so that handover to another base station can be performed.

However, in the case of 5G communication technology, wireless communication is performed through a signal having a higher frequency than the frequency used in the existing LTE, that is, 4G communication technology. For example, in the case of 4G communication, a frequency of 850Mhz to a high 2.6GHz band is used, whereas in the case of 5G communication, a frequency of 6Ghz or less (Sub-6 method) is used in the 3.5Ghz band or 28Ghz band (mmWave method). use.

As such, in the case of 5G communication technology, since wireless communication is performed with a signal having a higher frequency band, high-speed data transmission is possible. However, the higher the frequency, the stronger the straightness of the radio wave. There is a problem in that the serviceable area in which the recording service can be provided, that is, the area of coverage, becomes narrow.

Therefore, when an electronic device performing 5G communication moves at a high speed, there is a problem that handover may be frequently performed due to the narrow coverage of the 5G service base station. And in this case, the exchange of messages and data for the handover may occur frequently due to frequent handover of the electronic device, and the frequent exchange of messages and data causes waste of network resources and resources of the electronic device. there is

An object of the present invention is to solve the above and other problems, to provide an electronic device and a handover method of the electronic device that can prevent frequent occurrence of handover due to high-speed movement of the electronic device for that purpose

In addition, the present invention provides an electronic device and a handover method of the electronic device that, when the electronic device meets a handover condition, a handover can be performed by reflecting the size of coverage of adjacent base stations according to the moving speed of the electronic device Its purpose is to provide

According to an aspect of the present invention to achieve the above or other object, the electronic device according to an embodiment of the present invention, a memory including information about the RF bands that the electronic device can support, and movement of the electronic device A detection unit for detecting a speed, and when the detected moving speed of the electronic device exceeds a preset speed, the electronic device selects a list of supportable RF bands so that at least one of the supportable RF bands is excluded. Change the supportable RF bands of the electronic device registered with the base station by transmitting the list of the changed RF bands to the base station through a support function change request so that the base station performs handover according to the changed RF bands It is characterized in that it includes a modem.

In one embodiment, when the strength of the signal received from the electronic device is less than a preset threshold, the base station transmits information of a base station according to the changed RF bands among adjacent base stations to the electronic device, The modem, in response to the received base station information, is characterized in that it transmits a result of measuring signal strengths of base stations corresponding to each of the received base station information.

In an embodiment, the modem excludes at least one having a frequency greater than or equal to a preset reference frequency among RF bands supported by the electronic device, wherein the reference frequency is determined according to the moving speed of the electronic device characterized in that

In an embodiment, the reference frequency is lower as the moving speed of the electronic device is faster, and is higher as the moving speed of the electronic device is slower.

In one embodiment, when information on another base station to which the handover of the electronic device is to be performed is received from the base station, the modem restores the changed list of RF bands, and sets the list of restored RF bands to the other base station. It is characterized in that it is transmitted to the base station.

According to one aspect of the present invention to achieve the above or other object, the electronic device according to an embodiment of the present invention, a detection unit for detecting the moving speed of the electronic device, and a handover from a service base station connected to the electronic device When information on other base stations adjacent to the electronic device is received for this purpose, according to the moving speed of the electronic device, the strength of signals received from some of the other base stations is measured, and the strength of the received other base stations is measured. and a modem for transmitting, to the service base station, a result of measuring the strength of signals received from some of the base stations in response to the information.

In an embodiment, the service base station, according to a signal strength measurement result received from the electronic device, it is characterized in that the handover of the electronic device to one of the some of the base stations.

In an embodiment, the modem determines some of the base stations according to the size of the coverage area of each of the other base stations, and the coverage area size of each of the base stations is an RF band used by the base stations. It is characterized in that it is estimated according to the frequency of

In an embodiment, the modem determines some of the base stations by excluding at least one having a frequency higher than or equal to a preset reference frequency among RF bands supported by the electronic device, and the reference frequency is the electronic device. It is characterized in that it is determined according to the movement speed of

According to an aspect of the present invention to achieve the above or other object, in the method for handover of an electronic device according to an embodiment of the present invention, when a preset handover condition is satisfied, a service base station to which communication with the electronic device is connected A first step of receiving information of other adjacent base stations from, a second step of detecting signal strengths received from each of the received other base stations, and detecting a moving speed of the electronic device, A third step of transmitting measurement information (Measurement Report) including a signal strength detection result for each base station and a result of detecting the movement speed of the electronic device to the service base station in response to the received information of other base stations; When information for handover is received from the service base station to one of some base stations according to the detected moving speed of the electronic device among the signal strength detection results for each other base station, the handover to the one base station It is characterized in that it comprises a fourth step of transmitting information for.

In an embodiment, the service base station estimates the size of a coverage area of each of the other base stations based on the frequency of each of the RF bands supported by the electronic device, and the estimated size of the coverage area based on the detection of the part of the base station, and determining any one base station to perform the handover based on the signal strength detection results of the part of the base stations among the measurement information received from the electronic device do.

In an embodiment, the serving base station further includes a memory including information on the size of the coverage area of each of the other base stations, and based on the size of the coverage area of each of the other base stations, the partial base station and determining which one of the base stations to perform the handover on based on the signal strength detection results of the some of the base stations among the measurement information received from the electronic device.

In an embodiment, the measurement information, as a result of detecting the moving speed of the electronic device, includes information indicating whether the moving speed of the electronic device exceeds or does not exceed a preset speed do it with

The effects of the electronic device and the handover method of the electronic device according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, the present invention estimates the coverage size of each of the adjacent base stations based on the frequency when the moving speed of the electronic device exceeds a preset speed, and is constant based on the estimated coverage size. By preventing the handover from being performed to base stations having coverage smaller than the size, frequent handovers can be prevented from occurring when the electronic device moves at a high speed.

In addition, the present invention prevents frequent handover from occurring when the electronic device moves at a high speed, thereby reducing network resource consumption and resource consumption of the electronic device according to the handover.

1A is a block diagram illustrating an electronic device related to the present invention.

1B and 1C are exemplary views of an example of an electronic device related to the present invention viewed from different directions.

2 is a block diagram illustrating a configuration of a wireless communication unit of an electronic device operable in a plurality of wireless communication systems according to an embodiment of the present invention.

3 is a flowchart illustrating an operation process of an electronic device related to an embodiment of the present invention for limiting handover with some base stations by changing supportable RF band frequencies.

FIG. 4 is an exemplary diagram illustrating a process in which an electronic device exchanges data with a service base station according to the operation process of FIG. 3 .

5 is a flowchart illustrating an operation process of an electronic device according to an embodiment of the present invention limiting handover with some base stations by measuring only signal strengths of some base stations according to a moving speed.

FIG. 6 is an exemplary diagram illustrating a process in which an electronic device exchanges data with a service base station according to the operation process of FIG. 5 .

7 is a flowchart illustrating an operation process of a service base station limiting handover with some base stations according to a moving speed of an electronic device according to an embodiment of the present invention.

8 is an exemplary diagram illustrating a case in which handover of an electronic device is performed and a case in which handover of an electronic device is performed according to a conventional method according to an embodiment of the present invention.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "part" for the components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have a meaning or role distinct from each other by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is mentioned that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as "comprises" or "have" are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Electronic devices described in this specification include mobile phones, smart phones, laptop computers, digital broadcasting terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation systems, and slate PCs. , tablet PCs, ultrabooks, wearable devices, for example, watch-type terminals (smartwatch), glass-type terminals (smart glass), HMD (head mounted display), etc. may be included. have.

However, it will be readily apparent to those skilled in the art that the configuration according to the embodiment described herein may be applied to a fixed terminal such as a digital TV, a desktop computer, and a digital signage, except when applicable only to a mobile terminal. .

1A to 1C, FIG. 1A is a block diagram for explaining an electronic device related to the present invention, and FIGS. 1B and 1C are conceptual views of an example of the electronic device related to the present invention viewed from different directions.

The electronic device 100 includes a wireless communication unit 110 , an input unit 120 , a sensing unit 140 , an output unit 150 , an interface unit 160 , a memory 170 , a control unit 180 , and a power supply unit 190 . ) and the like. The components shown in FIG. 1A are not essential for implementing the electronic device, and thus the electronic device described herein may have more or fewer components than those listed above.

More specifically, the wireless communication unit 110 among the components, between the electronic device 100 and the wireless communication system, between the electronic device 100 and another electronic device 100, or the electronic device 100 and an external server It may include one or more modules that enable wireless communication between them. In addition, the wireless communication unit 110 may include one or more modules for connecting the electronic device 100 to one or more networks. Here, the one or more networks may be, for example, a 4G communication network and a 5G communication network.

The wireless communication unit 110 may include at least one of a 4G wireless communication module 111 , a 5G wireless communication module 112 , a short-range communication module 113 , and a location information module 114 .

The 4G wireless communication module 111 may transmit and receive a 4G signal with a 4G base station through a 4G mobile communication network. In this case, the 4G wireless communication module 111 may transmit one or more 4G transmission signals to the 4G base station. In addition, the 4G wireless communication module 111 may receive one or more 4G reception signals from the 4G base station.

In this regard, Up-Link (UL) Multi-Input Multi-Output (MIMO) may be performed by a plurality of 4G transmission signals transmitted to the 4G base station. In addition, Down-Link (DL) Multi-Input Multi-Output (MIMO) may be performed by a plurality of 4G reception signals received from a 4G base station.

The 5G wireless communication module 112 may transmit and receive a 5G signal with a 5G base station through a 5G mobile communication network. Here, the 4G base station and the 5G base station may have a Non-Stand-Alone (NSA) structure. For example, the 4G base station and the 5G base station may be a co-located structure disposed at the same location in a cell. Alternatively, the 5G base station may be disposed in a stand-alone (SA) structure at a location separate from the 4G base station.

The 5G wireless communication module 112 may transmit and receive a 5G signal with a 5G base station through a 5G mobile communication network. In this case, the 5G wireless communication module 112 may transmit one or more 5G transmission signals to the 5G base station. In addition, the 5G wireless communication module 112 may receive one or more 5G reception signals from the 5G base station.

In this case, the 5G frequency band may use the same band as the 4G frequency band, and this may be referred to as LTE re-farming. Meanwhile, as the 5G frequency band, the Sub6 band, which is a band below 6 GHz, may be used.

On the other hand, a millimeter wave (mmWave) band may be used as a 5G frequency band to perform broadband high-speed communication. When a millimeter wave (mmWave) band is used, the electronic device 100 may perform beam forming for communication coverage expansion with a base station.

Meanwhile, regardless of the 5G frequency band, the 5G communication system may support a larger number of Multi-Input Multi-Output (MIMO) in order to improve transmission speed. In this regard, Up-Link (UL) MIMO may be performed by a plurality of 5G transmission signals transmitted to the 5G base station. In addition, Down-Link (DL) MIMO may be performed by a plurality of 5G reception signals received from a 5G base station.

Meanwhile, the wireless communication unit 110 may be in a dual connectivity (DC) state with the 4G base station and the 5G base station through the 4G wireless communication module 111 and the 5G wireless communication module 112 . In this way, the dual connection with the 4G base station and the 5G base station may be referred to as EN-DC (EUTRAN NR DC). Here, EUTRAN is an Evolved Universal Telecommunication Radio Access Network, which means a 4G wireless communication system, and NR is New Radio, which means a 5G wireless communication system.

On the other hand, if the 4G base station and the 5G base station have a co-located structure, throughput can be improved through inter-CA (Carrier Aggregation). Therefore, the 4G base station and the 5G base station and the EN In the -DC state, a 4G reception signal and a 5G reception signal may be simultaneously received through the 4G wireless communication module 111 and the 5G wireless communication module 112 .

The short-range communication module 113 is for short-range communication, and includes Bluetooth™, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, NFC. At least one of (Near Field Communication), Wireless-Fidelity (Wi-Fi), Wi-Fi Direct, and Wireless Universal Serial Bus (USB) technologies may be used to support short-range communication. Such, the short-range communication module 114, between the electronic device 100 and the wireless communication system, between the electronic device 100 and other electronic devices, or the electronic device 100 and other via wireless area networks (Wireless Area Networks) It is possible to support wireless communication between networks in which the electronic device 100 or an external server is located. The local area network may be a local area network (Wireless Personal Area Networks).

Meanwhile, short-distance communication between electronic devices may be performed using the 4G wireless communication module 111 and the 5G wireless communication module 112 . In an embodiment, short-distance communication may be performed between electronic devices by a device-to-device (D2D) method without going through a base station.

On the other hand, for transmission speed improvement and communication system convergence (convergence), carrier aggregation (CA) using at least one of the 4G wireless communication module 111 and the 5G wireless communication module 112 and the Wi-Fi communication module 113 This can be done. In this regard, 4G + WiFi carrier aggregation (CA) may be performed using the 4G wireless communication module 111 and the Wi-Fi communication module 113 . Alternatively, 5G + WiFi carrier aggregation (CA) may be performed using the 5G wireless communication module 112 and the Wi-Fi communication module 113 .

The location information module 114 is a module for acquiring a location (or current location) of an electronic device, and a representative example thereof includes a Global Positioning System (GPS) module or a Wireless Fidelity (WiFi) module. For example, if the electronic device utilizes a GPS module, the location of the electronic device may be obtained by using a signal transmitted from a GPS satellite. As another example, if the electronic device utilizes the Wi-Fi module, the location of the electronic device may be acquired based on information of the Wi-Fi module and a wireless access point (AP) that transmits or receives a wireless signal. If necessary, the location information module 115 may perform any function of the other modules of the wireless communication unit 110 to obtain data on the location of the electronic device as a substitute or additionally. The location information module 115 is a module used to obtain the location (or current location) of the electronic device, and is not limited to a module that directly calculates or obtains the location of the electronic device.

Specifically, if the electronic device utilizes the 5G wireless communication module 112, the location of the electronic device may be obtained based on the information of the 5G wireless communication module and the 5G base station that transmits or receives the wireless signal. In particular, since the 5G base station of the millimeter wave (mmWave) band is deployed in a small cell having a narrow coverage, it is advantageous to obtain the location of the electronic device.

The input unit 120 includes a camera 121 or an image input unit for inputting an image signal, a microphone 122 or an audio input unit for inputting an audio signal, and a user input unit 123 for receiving information from a user, for example, , a touch key, a push key, etc.). The voice data or image data collected by the input unit 120 may be analyzed and processed as a user's control command.

The sensing unit 140 may include one or more sensors for sensing at least one of information in the electronic device, surrounding environment information surrounding the electronic device, and user information. For example, the sensing unit 140 may include a proximity sensor 141, an illumination sensor 142, an illumination sensor, a touch sensor, an acceleration sensor, a magnetic sensor, and gravity. Sensor (G-sensor), gyroscope sensor, motion sensor, RGB sensor, infrared sensor (IR sensor: infrared sensor), fingerprint sensor (finger scan sensor), ultrasonic sensor , optical sensors (eg, cameras (see 121)), microphones (see 122), battery gauges, environmental sensors (eg, barometers, hygrometers, thermometers, radiation detection sensors, It may include at least one of a thermal sensor, a gas sensor, etc.) and a chemical sensor (eg, an electronic nose, a healthcare sensor, a biometric sensor, etc.). Meanwhile, the electronic device disclosed in the present specification may combine and utilize information sensed by at least two or more of these sensors.

The output unit 150 is for generating an output related to visual, auditory or tactile sense, and includes at least one of a display unit 151 , a sound output unit 152 , a haptip module 153 , and an optical output unit 154 . can do. The display unit 151 may implement a touch screen by forming a layer structure with the touch sensor or being formed integrally with the touch sensor. Such a touch screen may function as the user input unit 123 providing an input interface between the electronic device 100 and the user, and may provide an output interface between the electronic device 100 and the user.

The interface unit 160 serves as a passage with various types of external devices connected to the electronic device 100 . Such an interface unit 160, a wired / wireless headset port (port), an external charger port (port), a wired / wireless data port (port), a memory card (memory card) port, for connecting a device equipped with an identification module It may include at least one of a port, an audio input/output (I/O) port, a video input/output (I/O) port, and an earphone port. In response to the connection of the external device to the interface unit 160 , the electronic device 100 may perform appropriate control related to the connected external device.

In addition, the memory 170 stores data supporting various functions of the electronic device 100 . The memory 170 may store a plurality of application programs (or applications) driven in the electronic device 100 , data for operation of the electronic device 100 , and commands. At least some of these application programs may be downloaded from an external server through wireless communication. In addition, at least some of these application programs may exist on the electronic device 100 from the time of shipment for basic functions (eg, incoming calls, outgoing functions, message reception, and outgoing functions) of the electronic device 100 . Meanwhile, the application program may be stored in the memory 170 , installed on the electronic device 100 , and driven to perform an operation (or function) of the electronic device by the controller 180 .

In addition to the operation related to the application program, the controller 180 generally controls the overall operation of the electronic device 100 . The controller 180 may provide or process appropriate information or functions to the user by processing signals, data, information, etc. input or output through the above-described components or by driving an application program stored in the memory 170 .

In addition, the controller 180 may control at least some of the components discussed with reference to FIG. 1A in order to drive an application program stored in the memory 170 . Furthermore, in order to drive the application program, the controller 180 may operate at least two or more of the components included in the electronic device 100 in combination with each other.

Hereinafter, the controller 180 that controls the overall operation of the electronic device will be referred to as a terminal controller 180 .

The power supply unit 190 receives external power and internal power under the control of the terminal control unit 180 to supply power to each component included in the electronic device 100 . The power supply 190 includes a battery, and the battery may be a built-in battery or a replaceable battery. Hereinafter, the power supply unit 190 for supplying power to each component included in the electronic device 100 will be referred to as a terminal power supply unit 190 .

At least some of the respective components may operate in cooperation with each other to implement an operation, control, or control method of an electronic device according to various embodiments described below. In addition, the operation, control, or control method of the electronic device may be implemented on the electronic device by driving at least one application program stored in the memory 170 .

1B and 1C , the disclosed electronic device 100 has a bar-shaped terminal body. However, the present invention is not limited thereto, and may be applied to various structures such as a watch type, a clip type, a glass type, or a folder type in which two or more bodies are coupled to be relatively movable, a flip type, a slide type, a swing type, a swivel type, etc. . While they will relate to a particular type of electronic device, descriptions relating to a particular type of electronic device may apply generally to other types of electronic device.

Here, the terminal body may be understood as a concept referring to the electronic device 100 as at least one aggregate.

The electronic device 100 includes a case (eg, a frame, a housing, a cover, etc.) forming an exterior. As shown, the electronic device 100 may include a front case 101 and a rear case 102 . Various electronic components are disposed in the inner space formed by the combination of the front case 101 and the rear case 102 . At least one middle case may be additionally disposed between the front case 101 and the rear case 102 .

A display unit 151 is disposed on the front surface of the terminal body to output information. As illustrated, the window 151a of the display unit 151 may be mounted on the front case 101 to form a front surface of the terminal body together with the front case 101 .

In some cases, an electronic component may also be mounted on the rear case 102 . Electronic components that can be mounted on the rear case 102 include a removable battery, an identification module, a memory card, and the like. In this case, the rear cover 103 for covering the mounted electronic component may be detachably coupled to the rear case 102 . Accordingly, when the rear cover 103 is separated from the rear case 102 , the electronic components mounted on the rear case 102 are exposed to the outside. On the other hand, a portion of the side of the rear case 102 may be implemented to operate as a radiator (radiator).

As shown, when the rear cover 103 is coupled to the rear case 102, a portion of the side of the rear case 102 may be exposed. In some cases, the rear case 102 may be completely covered by the rear cover 103 during the combination. Meanwhile, the rear cover 103 may have an opening for exposing the camera 121b or the sound output unit 152b to the outside.

The electronic device 100 includes a display unit 151 , first and second

sound output units

152a and 152b , a proximity sensor 141 , an illuminance sensor 142 , a light output unit 154 , and first and second

sound output units

152a and 152b.

Cameras

121a and 121b, first and second operation units 123a and 123b, a microphone 122, an interface unit 160, and the like may be provided.

The display unit 151 displays (outputs) information processed by the electronic device 100 . For example, the display unit 151 may display execution screen information of an application program driven in the electronic device 100 or UI (User Interface) and GUI (Graphic User Interface) information according to the execution screen information. .

In addition, two or more display units 151 may exist depending on the implementation form of the electronic device 100 . In this case, in the electronic device 100 , a plurality of display units may be spaced apart or disposed integrally on one surface, or may be respectively disposed on different surfaces.

The display unit 151 may include a touch sensor for sensing a touch on the display unit 151 so as to receive a control command input by a touch method. Using this, when a touch is made to the display unit 151 , the touch sensor detects the touch, and the terminal controller 180 may generate a control command corresponding to the touch based on this. The content input by the touch method may be letters or numbers, or menu items that can be instructed or designated in various modes.

As such, the display unit 151 may form a touch screen together with the touch sensor, and in this case, the touch screen may function as the user input unit 123 (refer to FIG. 1A ). In some cases, the touch screen may replace at least some functions of the first operation unit 123a.

The first sound output unit 152a may be implemented as a receiver that transmits a call sound to the user's ear, and the second sound output unit 152b is a loud speaker that outputs various alarm sounds or multimedia reproduction sounds. ) can be implemented in the form of

The light output unit 154 is configured to output light to notify the occurrence of an event. Examples of the event may include a message reception, a call signal reception, a missed call, an alarm, a schedule notification, an email reception, and information reception through an application. When the user's event confirmation is detected, the terminal control unit 180 may control the light output unit 154 to end the light output.

The first camera 121a processes an image frame of a still image or a moving image obtained by an image sensor in a shooting mode or a video call mode. The processed image frame may be displayed on the display unit 151 and stored in the memory 170 .

The first and second manipulation units 123a and 123b are an example of the user input unit 123 operated to receive a command for controlling the operation of the electronic device 100, and may be collectively referred to as a manipulating portion. have. The first and second operation units 123a and 123b may be adopted in any manner as long as they are operated in a tactile manner such as touch, push, scroll, etc. by the user while receiving a tactile feeling. In addition, the first and second manipulation units 123a and 123b may be operated in a manner in which the user is operated without a tactile feeling through a proximity touch, a hovering touch, or the like.

Meanwhile, the electronic device 100 may be provided with a fingerprint recognition sensor for recognizing a user's fingerprint, and the terminal controller 180 may use fingerprint information detected through the fingerprint recognition sensor as an authentication means. The fingerprint recognition sensor may be built in the display unit 151 or the user input unit 123 .

The microphone 122 is configured to receive a user's voice, other sounds, and the like. The microphone 122 may be provided at a plurality of locations and configured to receive stereo sound.

The interface unit 160 serves as a passage through which the electronic device 100 can be connected to an external device. For example, the interface unit 160 is a connection terminal for connection with another device (eg, earphone, external speaker), a port for short-range communication (eg, infrared port (IrDA Port), Bluetooth port (Bluetooth) Port), a wireless LAN port, etc.], or may be at least one of a power supply terminal for supplying power to the electronic device 100 . The interface unit 160 may be implemented in the form of a socket for accommodating an external card such as a Subscriber Identification Module (SIM), a User Identity Module (UIM), or a memory card for information storage.

A second camera 121b may be disposed on the rear side of the terminal body. In this case, the second camera 121b has a photographing direction substantially opposite to that of the first camera 121a.

The second camera 121b may include a plurality of lenses arranged along at least one line. The plurality of lenses may be arranged in a matrix form. Such a camera may be referred to as an array camera. When the second camera 121b is configured as an array camera, an image may be captured in various ways using a plurality of lenses, and an image of better quality may be obtained.

The flash 124 may be disposed adjacent to the second camera 121b. The flash 124 illuminates light toward the subject when the subject is photographed by the second camera 121b.

A second sound output unit 152b may be additionally disposed on the terminal body. The second sound output unit 152b may implement a stereo function together with the first sound output unit 152a, and may be used to implement a speakerphone mode during a call.

At least one antenna for wireless communication may be provided in the terminal body. The antenna may be built into the terminal body or formed in the case. Meanwhile, a plurality of antennas connected to the 4G wireless communication module 111 and the 5G wireless communication module 112 may be disposed on the side of the electronic device 100 . Alternatively, the antenna may be formed in a film type and attached to the inner surface of the rear cover 103 , or a case including a conductive material may be configured to function as an antenna.

Meanwhile, the plurality of antennas disposed on the side of the electronic device 100 may be implemented in four or more to support MIMO. In addition, when the 5G wireless communication module 112 operates in a millimeter wave (mmWave) band, as each of the plurality of antennas is implemented as an array antenna, a plurality of array antennas may be disposed in the electronic device.

The terminal body is provided with a terminal power supply unit 190 (refer to FIG. 1A ) for supplying power to the electronic device 100 . The terminal power supply unit 190 may include a battery 191 that is built into the terminal body or is detachably configured from the outside of the terminal body.

Hereinafter, a structure of a multiple transmission system according to the present invention and an electronic device having the same, in particular, a power amplifier in a heterogeneous radio system and an electronic device having the same will be described with reference to the accompanying drawings. It is apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

2 illustrates a configuration of a wireless communication unit of an electronic device operable in a plurality of wireless communication systems according to the present invention. Referring to FIG. 2 , the electronic device includes a first power amplifier 210 , a second power amplifier 220 , and an RFIC 250 . In addition, the electronic device may further include a modem (Modem, 270) and an application processor (AP: Application Processor, 280). Here, the modem 270 and the application processor AP 280 are physically implemented on a single chip, and may be implemented in a logically and functionally separated form. However, the present invention is not limited thereto and may be implemented in the form of physically separated chips according to applications.

Meanwhile, the electronic device includes a plurality of low noise amplifiers (LNAs) 261 to 264 in the receiver. Here, the first power amplifier 210 , the second power amplifier 220 , the RFIC 250 , and the plurality of low-noise amplifiers 261 to 264 are all operable in the first communication system and the second communication system. In this case, the first communication system and the second communication system may be a 4G communication system and a 5G communication system, respectively.

As shown in FIG. 2 , the RFIC 250 may be configured as a 4G/5G integrated type, but is not limited thereto and may be configured as a 4G/5G separate type according to an application. When the RFIC 250 is configured as a 4G/5G integrated type, it is advantageous in terms of synchronization between 4G/5G circuits, as well as the advantage that control signaling by the modem 270 can be simplified.

Meanwhile, when the RFIC 250 is configured as a 4G/5G separate type, it may be referred to as a 4G RFIC and a 5G RFIC, respectively. In particular, when the difference between the 5G band and the 4G band is large, such as when the 5G band is configured as a millimeter wave band, the RFIC 250 may be configured as a 4G/5G separate type. As such, when the RFIC 250 is configured as a 4G/5G separate type, there is an advantage that RF characteristics can be optimized for each of the 4G band and the 5G band.

Meanwhile, even when the RFIC 250 is configured as a 4G/5G separated type, the 4G RFIC and the 5G RFIC are logically and functionally separated, and it is also possible to be physically implemented on one chip.

On the other hand, the application processor (AP, 280) is configured to control the operation of each component of the electronic device. Specifically, the application processor (AP) 280 may control the operation of each component of the electronic device through the modem 270 .

For example, the application processor (AP) 280 may control the modem 270 through a power management IC (PMIC) for low power operation of the electronic device. Accordingly, the modem 270 may operate the power circuits of the transmitter and the receiver in the low power mode through the RFIC 250 .

In this regard, when it is determined that the electronic device is in an idle mode, the application processor (AP) 280 may control the RFIC 250 through the modem 270 as follows. For example, if the electronic device is in an idle mode, at least one of the first and

second power amplifiers

110 and 120 operates in the low power mode or is turned off via the RFIC through the modem 270 . 250 can be controlled.

According to another embodiment, when the electronic device is in a low power mode, the application processor (AP) 280 may control the modem 270 to provide wireless communication capable of low power communication. For example, when the electronic device is connected to a plurality of entities among a 4G base station, a 5G base station, and an access point, the application processor (AP) 280 may control the modem 270 to enable wireless communication with the lowest power. Accordingly, the application processor (AP) 280 may control the modem 270 and the RFIC 250 to perform short-range communication using only the short-range communication module 113 even at sacrificing some throughput.

According to another embodiment, when the remaining battery level of the electronic device is equal to or greater than a threshold, the modem 270 may be controlled to select an optimal wireless interface. For example, the application processor (AP) 280 may control the modem 270 to receive data through both the 4G base station and the 5G base station according to the remaining battery level and available radio resource information. In this case, the application processor (AP) 280 may receive the remaining battery level information from the PMIC and the available radio resource information from the modem 270 . Accordingly, if the battery level and available radio resources are sufficient, the application processor (AP) 280 may control the modem 270 and the RFIC 250 to receive data through both the 4G base station and the 5G base station.

Meanwhile, the multi-transceiving system of FIG. 2 may integrate a transmitter and a receiver of each radio system into one transceiver. Accordingly, there is an advantage that a circuit part integrating two types of system signals in the RF front-end can be removed.

In addition, since the front-end components can be controlled by the integrated transceiver, the front-end components can be integrated more efficiently than when the transmission/reception systems are separated for each communication system.

In addition, when each communication system is separated, it is impossible to control other communication systems as necessary, or efficient resource allocation is impossible because the system delay is increased. On the other hand, the multi-transmission/reception system as shown in FIG. 2 has the advantage that it is possible to control other communication systems as necessary, and thus system delay can be minimized, thereby enabling efficient resource allocation.

Meanwhile, the first power amplifier 210 and the second power amplifier 220 may operate in at least one of the first and second communication systems. In this regard, when the 5G communication system operates in the 4G band or the Sub6 band, the first and second power amplifiers 220 may operate in both the first and second communication systems.

On the other hand, when the 5G communication system operates in the millimeter wave (mmWave) band, one of the first and

second power amplifiers

210 and 220 operates in the 4G band, and the other operates in the millimeter wave band. have.

Meanwhile, by integrating the transceiver and the receiving unit, two different wireless communication systems can be implemented with one antenna by using an antenna for both transmitting and receiving. In this case, 4x4 MIMO can be implemented using four antennas as shown in FIG. 2 . In this case, 4x4 DL MIMO may be performed through the downlink (DL).

Meanwhile, if the 5G band is the Sub6 band, the first to fourth antennas ANT1 to ANT4 may be configured to operate in both the 4G band and the 5G band. On the other hand, if the 5G band is a millimeter wave (mmWave) band, the first to fourth antennas ANT1 to ANT4 may be configured to operate in any one of the 4G band and the 5G band. In this case, if the 5G band is a millimeter wave (mmWave) band, each of a plurality of separate antennas may be configured as an array antenna in the millimeter wave band.

Meanwhile, 2x2 MIMO implementation is possible using two antennas connected to the first power amplifier 210 and the second power amplifier 220 among the four antennas. In this case, 2x2 UL MIMO (2 Tx) may be performed through the uplink (UL). Alternatively, it is not limited to 2x2 UL MIMO, and may be implemented with 1 Tx or 4 Tx. In this case, when the 5G communication system is implemented as 1 Tx, only one of the first and

second power amplifiers

210 and 220 may operate in the 5G band. On the other hand, when the 5G communication system is implemented as 4Tx, an additional power amplifier operating in the 5G band may be further provided. Alternatively, a transmission signal may be branched in each of one or two transmission paths, and the branched transmission signal may be connected to a plurality of antennas.

On the other hand, since a switch-type splitter or a power divider is built inside the RFIC corresponding to the RFIC 250, there is no need for a separate component to be disposed outside, thereby improving component mountability. can Specifically, by using a single pole double throw (SPDT) type switch inside the RFIC corresponding to the controller 250 , it is possible to select the transmitter (TX) of two different communication systems.

In addition, an electronic device capable of operating in a plurality of wireless communication systems according to the present invention may further include a duplexer 231 , a filter 232 , and a switch 233 .

The duplexer 231 is configured to mutually separate signals of a transmission band and a reception band. In this case, the signal of the transmission band transmitted through the first and

second power amplifiers

210 and 220 may be applied to the antennas ANT1 and ANT4 through the first output port of the duplexer 231 . On the other hand, signals of the reception band received through the antennas ANT1 and ANT4 may be received by the

low noise amplifiers

261 and 264 through the second output port of the duplexer 231 .

The filter 232 may be configured to pass a signal of a transmission band or a reception band and block a signal of the remaining band. In this case, the filter 232 may include a transmit filter connected to a first output port of the duplexer 231 and a receive filter connected to a second output port of the duplexer 231 . Alternatively, the filter 232 may be configured to pass only a signal of a transmission band or only a signal of a reception band according to the control signal.

The switch 233 is configured to transmit either only a transmit signal or a receive signal. In an embodiment of the present invention, the switch 233 may be configured in a single pole double throw (SPDT) type to separate a transmission signal and a reception signal using a time division multiplexing (TDD) method. In this case, the transmission signal and the reception signal are signals of the same frequency band, and accordingly, the duplexer 231 may be implemented in the form of a circulator.

On the other hand, in another embodiment of the present invention, the switch 233 is also applicable to a frequency division multiplexing (FDD: Time Division Duplex) scheme. In this case, the switch 233 may be configured in a double pole double throw (DPDT) type to connect or block a transmission signal and a reception signal, respectively. Meanwhile, since the transmission signal and the reception signal can be separated by the duplexer 231 , the switch 233 is not necessarily required.

On the other hand, the electronic device according to the present invention may further include a modem 270 corresponding to the control unit. In this case, the RFIC 250 and the modem 270 may be referred to as a first controller (or first processor) and a second controller (second processor), respectively. Meanwhile, the RFIC 250 and the modem 270 may be implemented as physically separate circuits. Alternatively, the RFIC 250 and the modem 270 may be physically or logically divided into one circuit.

The modem 270 may control and process signals for transmission and reception of signals through different communication systems through the RFIC 250 . The modem 270 may be obtained through control information received from the 4G base station and/or the 5G base station. Here, the control information may be received through a physical downlink control channel (PDCCH), but is not limited thereto.

The modem 270 may control the RFIC 250 to transmit and/or receive signals via the first communication system and/or the second communication system in a specific time and frequency resource. Accordingly, the RFIC 250 may control transmission circuits including the first and

second power amplifiers

210 and 220 to transmit a 4G signal or a 5G signal in a specific time period. Also, the RFIC 250 may control receiving circuits including the first to fourth low noise amplifiers 261 to 264 to receive a 4G signal or a 5G signal in a specific time period.

Meanwhile, detailed operations and functions of the electronic device according to the present invention provided with the multiple transmission/reception system as shown in FIG. 2 will be reviewed below.

Meanwhile, the electronic device 100 according to an embodiment of the present invention may detect the moving speed in various ways. For example, the electronic device 100 may detect the moving speed of the electronic device 100 based on a change in the position of the electronic device 100 detected through the above-described location information module 114 . Alternatively, the electronic device 100 may detect the moving speed based on at least one sensor (eg, an inertial sensor or an acceleration sensor) provided in the sensing unit 140 . And when the detected moving speed of the electronic device 100 exceeds a preset speed, the serviceable area of each of the base stations adjacent to the electronic device 100, that is, a coverage size is estimated, and the estimated coverage size Based on , base stations having coverage less than a certain size may be excluded from the handover target base station. Therefore, when the electronic device 100 according to an embodiment of the present invention moves at a high speed, the handover is performed to base stations having a coverage of a predetermined size or more, thereby reducing the frequency of the handover.

Meanwhile, as a result of detecting the moving speed, if the preset handover condition is satisfied in a state in which the moving speed of the electronic device 100 is less than the preset speed, the electronic device 100 performs a handover according to a conventional method. Over can be done. In this case, regardless of the coverage, the service base station determines which one base station is the most suitable base station for handover based on the signal strength transmitted from each adjacent base station and the state of the network, and the electronic device 100 as the determined base station. of handover can be performed.

Hereinafter, in the description of FIGS. 3 to 8 , it is assumed that the moving speed exceeds a preset speed as a result of detecting the moving speed of the electronic device 100, and the coverage size is estimated and handover to some base stations according to the estimation result. Embodiments of the present invention limiting the will be described.

First, FIG. 3 is a flowchart illustrating an operation process of the electronic device 100 according to an embodiment of the present invention for limiting handover with some base stations by changing supportable RF bands.

Referring to FIG. 3 , the modem 270 of the electronic device 100 according to an embodiment of the present invention supports the electronic device 100 when the moving speed of the electronic device 100 exceeds a preset speed. The electronic device 100 may change the list of supportable RF bands so as not to include at least one of the possible RF bands (S300).

In general, in terms of frequency characteristics, a high frequency has higher linearity than a low frequency, and thus, a base station that provides a communication service using a high frequency signal may have a smaller serviceable area, that is, a coverage size. Accordingly, the modem 270 may estimate the coverage size of base stations using each RF band based on each of the frequencies of the RF bands that the electronic device 100 can support.

Therefore, the modem 270 changes the list of supportable RF bands so that the electronic device 100 temporarily does not support the high-frequency RF bands higher than the preset reference frequency, so that the coverage according to the reference frequency is higher than the coverage according to the reference frequency. It is possible to prevent handover from being performed to base stations having narrow coverage.

Meanwhile, in step S300, if the list of supportable RF bands is changed, the modem 270 may register the changed list of supportable RF bands in a service base station, that is, a base station connected to the electronic device 100 and providing a communication service. There is (S302). To this end, the modem 270 may request the service base station to change the support function of the electronic device 100, and in response thereto, in response to the support function inquiry message received from the service base station, the changed supportable RF The band list may be transmitted to the service base station.

Then, the service base station may identify the RF bands supportable by the electronic device 100 according to the list of supportable RF bands received from the electronic device 100 . Accordingly, the service base station may determine that the electronic device 100 does not support the high-frequency RF band above the reference frequency.

Therefore, when a preset handover condition is satisfied, the serving base station may search for other base stations around the electronic device 100 based on the changed list of supportable RF bands. In addition, information on the found base stations may be transmitted to the electronic device 100 . Accordingly, the modem 270 of the electronic device 100 may receive, from the service base station, only information about base stations using frequencies according to the changed list of supportable RF bands among neighboring base stations (S306). .

In addition, the modem 270 may detect signal strengths of signals received from base stations corresponding to each of the received base station information (S308). In addition, measurement information (Measurement Report) including the detected signal strengths may be transmitted to the service base station (S308).

Meanwhile, the service base station that has received the measurement information may determine the base station to which the electronic device 100 is to be handed over by reflecting the signal strengths for each base station included in the measurement information. For example, the service base station may determine a base station having available network resources of a certain level or higher among base stations having a signal strength measured by the electronic device 100 or higher. Then, the determined base station information is transmitted to the electronic device 100 so that handover can be performed to the determined base station (hereinafter referred to as a handover base station) (S310). When the handover is performed in this way, the electronic device 100 registers information for a communication service, such as a list of supportable RF bands, to receive a communication service through the handover base station.

Meanwhile, the RF band list transmitted during handover to the handover base station in step S310 may be the list of RF bands before being changed in step S300. That is, when information on the handover base station is received from the service base station in step S308, the modem 270 may restore the list of supportable RF bands changed in step S300 to the original state. In addition, by transmitting the list of RF bands restored in step S310, the electronic device 100 can be registered with the handover base station in a state in which high-frequency RF bands higher than the reference frequency can be supported.

Therefore, in the present invention, when the moving speed of the electronic device 100 exceeds a preset speed, by changing the function of the electronic device 100 to temporarily not support a high frequency higher than the reference frequency, the size of the coverage is constant. Handover with the base station estimated to be less than the level may be restricted.

FIG. 4 is an exemplary diagram illustrating a process in which the electronic device 100 exchanges data with the service base station 400 according to the operation process of FIG. 3 .

4 is an electronic device 100 according to an embodiment of the present invention supports Band A, B, and C, and a base station 400 (service base station) using a frequency according to Band A and the electronic device 100 are connected. It is assumed that the first base station 401 using a frequency according to Band B and the second base station 402 using a frequency according to Band C are adjacent to the vicinity of the electronic device 100 .

Referring to FIG. 4 , first, the electronic device 100 according to an embodiment of the present invention may perform network registration in order to receive a communication service to the service base station 400 ( 410 ). To this end, the service base station 400 may inquire about a function that the electronic device 100 can support, and in response to this, the information of the RF bands (eg, Band A, B, C) that the electronic device 100 can support. A list of RF bands including may be transmitted to the service base station 400 . In addition, the service base station 400 may complete network registration by connecting the electronic device 100 and wireless communication.

As such, in a state in which communication is connected with the service base station 400 through network registration, the electronic device 100 may determine the moving speed of the electronic device 100 ( 420 ). And if the moving speed of the electronic device 100 exceeds a preset speed, a list of RF bands in which a band (eg, Band B) above a preset reference frequency among RF bands supported by the electronic device 100 is excluded. (Band A, C) can be created.

In addition, when a new RF band list is generated, the electronic device 100 may transmit a message (Registration Request) for requesting a support function change to the service base station 400 . And in response to this, when the service base station 400 transmits a support capability inquiry message (UE Capability Inquiry), in response thereto, a list of RF bands excluding the Band B may be transmitted (UE Capability Information). Accordingly, the service base station 400 may identify the RF bands supported by the electronic device 100 as Bands A and C, except for the Band B. Accordingly, the list of RF bands supported by the electronic device 100 may be temporarily changed ( 430 ).

On the other hand, when a preset handover condition is satisfied according to the signal strength received from the electronic device 100 , the service base station 400 selects one of the RF bands Band A and C supported by the identified electronic device 100 . Information of an adjacent base station using the remaining RF bands other than its own RF band may be provided to the electronic device 100 (Radio Resource Control (RRC) Connection Reconfiguration). Accordingly, the service base station 400 may transmit information on the second base station 402 according to Band C to the electronic device 100 .

Then, the electronic device 100 may detect the received signal strength of the second base station 402 and generate measurement information including the detected signal strength information and transmit it to the service base station 400 . In addition, the serving base station 400 may determine the second base station 402 as the handover base station based on the received measurement information, and may transmit information on the determined handover base station to the electronic device 100 .

Then, the electronic device 100 transmits a handover completion message (HO message) including information for receiving a communication service to the received handover base station, for example, a list of supported RF bands, and the second It may be handed over to the base station 402 (440). In this case, the list of RF bands transmitted to the handover base station, that is, the second base station 402 may be a list of RF bands that the electronic device 100 can actually support. Therefore, it may include Band B.

On the other hand, in the description of FIGS. 3 and 4 above, the electronic device 100 changes the list of supportable RF bands to limit the base station to be handed over, but unlike this, the RF band registered in the service base station 400 is described. Of course, it is also possible to limit the base station to be handed over by the electronic device 100 itself without having to change the list.

5 is an operation process of limiting handover with some base stations without the need to change the RF band list registered in the base station by measuring only the signal strength of some base stations according to the moving speed of the electronic device according to an embodiment of the present invention; It is a flow chart shown.

Referring to FIG. 5 , the modem 270 of the electronic device 100 according to an embodiment of the present invention supports the electronic device 100 when the moving speed of the electronic device 100 exceeds a preset speed. The electronic device 100 may change the list of supported RF bands so as not to include at least one of the possible RF bands (S500). In this case, the changed RF band list may not include a high frequency RF band higher than a preset reference frequency.

In addition, when a preset handover condition is satisfied, when information of other base stations adjacent to the electronic device 100 is transmitted from the service base station, the modem 270 may receive it (S502). Here, the information of other adjacent base stations provided from the service base station may include information on an RF band used by each of the other base stations.

Accordingly, the modem 270 may detect only information on base stations corresponding to a supportable RF band based on the RF band list changed in step S500 from the information of the other adjacent base stations in step S502 (S504). And it is possible to detect the strength of the signal received from the base stations corresponding to the detected information of the base stations (S506). In addition, measurement information (Measurement Report) including the detected signal strengths may be transmitted to the service base station (S508).

Therefore, if there is a base station using a high-frequency RF band higher than the preset reference frequency around the electronic device 100, the modem 270 may not detect the strength of a signal received from the corresponding base station, and accordingly, the signal of the corresponding base station. The intensity detection information may not be included in the measurement information.

Meanwhile, the service base station may determine the handover base station as one of the base stations from which the signal strength is detected from the electronic device 100 . Accordingly, the serving base station can determine the handover base station as any one of the base stations other than the base station using the high-frequency RF band above the reference frequency. Then, the electronic device 100 may be handed over to the determined handover base station (S510).

Accordingly, the electronic device 100 according to an embodiment of the present invention does not change the list of supportable RF bands of the electronic device 100 identified by the service base station, and the electronic device 100 itself has a high frequency above the reference frequency. The handover may be performed to any one of the base stations other than the base station using the RF band.

Meanwhile, when handover is performed to the handover base station in step S510, the modem 270 may restore the RF band list changed in step S500 to its original state. In this case, the restored RF band list is transmitted to the handover base station, so that the electronic device 100 can be registered with the handover base station in a state in which high-frequency RF bands greater than or equal to the reference frequency can be supported.

FIG. 6 is an exemplary diagram illustrating data exchanged by an electronic device with a service base station according to the operation process of FIG. 5 .

6 is an electronic device 100 according to an embodiment of the present invention supports Band A, B, and C, and a base station 600 (service base station) using a frequency according to Band A and the electronic device 100 are connected. It is assumed that the first base station 601 using the frequency according to Band B and the second base station 602 using the frequency according to Band C are adjacent to the periphery of the electronic device 100 .

Referring to FIG. 6 , first, the electronic device 100 according to an embodiment of the present invention may perform network registration in order to receive a communication service to the service base station 600 ( 610 ). To this end, the service base station 600 may inquire about a function that the electronic device 100 can support, and in response to this, the information of the RF bands (eg, Band A, B, C) that the electronic device 100 can support. A list of RF bands including may be transmitted to the service base station (600). In addition, the service base station 600 may complete network registration by connecting the electronic device 100 and wireless communication.

As described above, in a state in which the service base station 600 is communicatively connected through network registration, the electronic device 100 may determine the moving speed of the electronic device 100 ( 620 ). And if the moving speed of the electronic device 100 exceeds a preset speed, a list of RF bands in which a band (eg, Band B) above a preset reference frequency among RF bands supported by the electronic device 100 is excluded. (Band A, C) may be generated (630).

On the other hand, when a preset handover condition is satisfied according to the signal strength received from the electronic device 100 , the service base station 600 supports supportable RF bands (Band A) of the electronic device 100 registered at the time of network registration. , B, and C) may provide the electronic device 100 with information of an adjacent base station using the remaining RF bands except for its own RF band. Accordingly, the service base station 400 may transmit information on the first base station 601 according to Band B and the second base station 602 according to Band C to the electronic device 100 .

Then, the electronic device 100 receives some of the base station information transmitted from the service base station 600 based on the RF band list (Band A, C) from which the band (eg, Band B) above the preset reference frequency is excluded. can be detected. That is, based on the currently changed list of RF bands (Bands A and C), among the base station information transmitted from the service base station 600, only base station information according to a supportable RF band may be detected. Accordingly, only information of the second base station 602 according to Band C can be detected.

Accordingly, the modem 270 may detect the signal strength of the signal transmitted from the second base station 602 , generate measurement information including the detected signal strength information, and transmit it to the service base station 600 . In addition, the serving base station 600 may determine the second base station 602 as the handover base station based on the received measurement information, and may transmit information on the determined handover base station to the electronic device 100 .

Then, the electronic device 100 transmits a handover completion message (HO message) including information for receiving a communication service to the received handover base station, for example, a list of supported RF bands, and the second A handover may be made to the base station 602 (640).

Meanwhile, in the above description, the operation process of the modem 270 limiting handover with some base stations by changing the RF bands that the electronic device 100 can support has been described. However, it goes without saying that the handover restriction with some of the base stations may be performed by the serving base station.

7 is a flowchart illustrating an operation process in which the service base station limits handover with some base stations according to the moving speed of the electronic device 100 in this case.

7 is an electronic device 100 according to an embodiment of the present invention supports Band A, B, and C, and the base station 700 (service base station) using a frequency according to Band A and the electronic device 100 are connected. It is assumed that the first base station 701 using the frequency according to Band B and the second base station 702 using the frequency according to Band C are adjacent to the vicinity of the electronic device 100 .

Referring to FIG. 7 , after the electronic device 100 registers the initial network, if the handover condition set at the time of the initial network registration is satisfied, the service base station 700 connects to the base stations (the first) adjacent to the electronic device 100 . By transmitting information on the base station 701 and the second base station 702), it is possible to request signal strength detection of the adjacent base stations (the first base station 701 and the second base station 702) (710).

Then, the modem 270 of the electronic device 100 according to an embodiment of the present invention may measure the strength of signals received from the first base station 701 and the second base station 702, and use the measured signal strength. Including measurement information (Measurement report) can be generated.

Meanwhile, the modem 270 may further include information related to the moving speed of the electronic device 100 (hereinafter, referred to as speed information) in the measurement information. For example, if the moving speed of the electronic device 100 exceeds a preset speed, '1' is set, and if the moving speed of the electronic device 100 does not exceed the preset speed, '0' is set to the speed. Measurement information to be further included as information can be generated. In addition, the generated measurement information may be transmitted to the service base station 700 .

Then, the service base station 700 may determine whether to limit the handover of some base stations based on the movement speed information of the electronic device 100 included in the measurement information. Then, a handover base station may be determined according to the determination result ( 730 ).

For example, if the moving speed of the electronic device 100 is determined according to the speed information included in the measurement information, and the moving speed of the electronic device 100 exceeds a preset speed, the service base station 700 ) may detect base stations corresponding to the remaining RF bands from the list of supportable RF bands of the electronic device 100 registered at the time of initial network registration, except for RF bands above the reference frequency. In this case, if the first base station 701 uses an RF band equal to or higher than the reference frequency, the serving base station 700 may determine a handover base station as any one of the remaining base stations except for the first base station 701 . .

Accordingly, the serving base station 700 may determine the remaining base stations other than the first base station 701, that is, the second base station 702, as the handover base station. Then, the service base station 700 may transmit handover information to the second base station 702 to the electronic device 100 ( 740 ), and the electronic device 100 transmits information necessary for handover to the second base station 702 . , the handover to the second base station 702 may be performed.

On the other hand, in the description of step 730, the coverage sizes of the first base station 701 and the second base station 702 are estimated based on the frequency of the RF band used by the service base station 700, and hand with some base stations. Although the configuration for limiting over has been described as an example, unlike this, the serving base station 700 actually covers the adjacent base stations (the first base station 701 and the second base station 702), such as cell size information. It goes without saying that information about the size of the geographic area may be included.

In this case, if the moving speed of the electronic device 100 exceeds a preset speed, the serving base station 700 may detect the remaining base stations except for the base station having the size of the coverage area less than a predetermined size. In this case, if the size of the coverage area of the first base station 701 is less than the preset size, the serving base station 700 may determine a handover base station as any one of the remaining base stations except for the first base station 701 .

Meanwhile, FIG. 8 is an exemplary diagram illustrating a case in which handover of an electronic device is performed according to an embodiment of the present invention and a case in which handover of an electronic device is performed according to a conventional method.

Referring to FIG. 8 , the moving electronic device 100 and base stations adjacent to the moving electronic device 100 (a first base station 811 , a second base station 821 , a third base station 831 and a second base station 831 ) 4, an example of the base station 841) is shown. Meanwhile, the first to

fourth base stations

811 , 821 , 831 , and 841 may each have a coverage area size determined according to the frequency of the RF band used, and each of the coverage areas is different depending on the frequency of the RF band used. can be formed.

Therefore, the first coverage area 810 of the first base station 811 and the fourth coverage area 840 of the fourth base station 841 using the same Band A may have coverage areas of the same or similar size to each other, The widest coverage area may be formed by using the lowest frequency. Meanwhile, the size of the second coverage area 820 of the second base station 821 using Band B and the third coverage area 830 of the third base station 831 using Band C may be different from each other. As the frequency of the RF band of the second base station 821 is higher, the size of the second coverage area 820 may be narrower. Here, the second base station 821 may be an RF band using a high frequency higher than a preset level.

First, in a normal case or when the electronic device 100 moves along a specific direction 800 at a speed less than or equal to a preset speed, the electronic device 100 may first be handed over to the second base station 821 . . Next, handover may be sequentially performed to the third base station 831 and the fourth base station 841 . Accordingly, when the electronic device 100 moves to a location adjacent to the fourth base station 841 in the specific direction 800, a total of three handovers are performed as shown in the handover path 860 in a typical case. can be performed.

On the other hand, according to an embodiment of the present invention, when the electronic device 100 moves along the specific direction 800 to a position adjacent to the fourth base station 841 at a speed exceeding a preset speed, the present invention When the first base station 811 performs handover, the electronic device 100 according to the embodiment may change the list of supportable RF bands of the electronic device 100 to that Band B is not temporarily supported.

Accordingly, in the electronic device 100 according to an embodiment of the present invention, handover from the first base station 811 to the second base station 821 using Band B may be restricted. Accordingly, the electronic device 100 may be handed over directly to the third base station 831 , and then the handover may be performed to the fourth base station 841 . Accordingly, when the electronic device 100 moves to a position adjacent to the fourth base station 841 along the specific direction 800 , only two handovers may be performed.

Meanwhile, in the above description, it has been described that the reference frequency for limiting handover of some base stations is preset, but it goes without saying that the reference frequency may be changed according to the moving speed of the electronic device 100 . In this case, if the moving speed of the electronic device 100 is fast, the reference frequency may be lowered so that the electronic device 100 can be handed over to base stations having a wider coverage size. Accordingly, the number of base stations to which handover is restricted may increase.

On the other hand, if the moving speed of the electronic device 100 is slow, the reference frequency may be higher so that handover can be performed even for base stations having smaller coverage sizes. In this case, the number of base stations to which handover is restricted may be reduced.

Meanwhile, in the above description, each operation of the present invention of detecting the speed of the electronic device 100 and estimating the coverage size of adjacent base stations and limiting handover to some base stations according to the estimation result is performed by the modem 270 Although it has been mentioned that it can be performed, it goes without saying that it may be performed by the controller 180 or the AP 280 .

The present invention described above can be implemented as computer-readable code on a medium in which a program is recorded. The computer-readable medium includes all kinds of recording devices in which data readable by a computer system is stored. Examples of computer-readable media include Hard Disk Drive (HDD), Solid State Disk (SSD), Silicon Disk Drive (SDD), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. There is also a carrier wave (eg, transmission over the Internet) that is implemented in the form of. In addition, the computer may include the control unit 180 of the terminal. Accordingly, the above detailed description should not be construed as restrictive in all respects but as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

Claims

In electronic devices,

a memory including information on RF bands supported by the electronic device;

a detection unit for detecting the moving speed of the electronic device; and;

When the detected moving speed of the electronic device exceeds a preset speed, the electronic device changes the list of supportable RF bands so that at least one of the supportable RF bands is excluded,

A modem that transmits a list of the changed RF bands to the base station through a support function change request to change the supportable RF bands of the electronic device registered with the base station so that the base station performs handover according to the changed RF bands Electronic device comprising a.
According to claim 1,

The base station is

When the strength of the signal received from the electronic device is less than a preset threshold, information of a base station according to the changed RF bands among adjacent base stations is transmitted to the electronic device,

The modem is

In response to the received base station information, the electronic device characterized in that it transmits a result of measuring signal strengths of base stations corresponding to each of the received base station information.
According to claim 1, wherein the modem,

Excluding at least one having a frequency greater than or equal to a preset reference frequency from among the RF bands supported by the electronic device,

The reference frequency is

Electronic device, characterized in that determined according to the moving speed of the electronic device.
The method of claim 3, wherein the reference frequency is

An electronic device, characterized in that the faster the moving speed of the electronic device is, the lower it is, and the slower the moving speed of the electronic device is, the higher it is.
According to claim 1, wherein the modem,

When information on another base station to which handover of the electronic device is to be performed is received from the base station, the changed list of RF bands is restored, and the list of restored RF bands is transmitted to the other base station .
In electronic devices,

a detection unit for detecting the moving speed of the electronic device; and;

When information on other base stations adjacent to the electronic device for handover is received from the service base station connected to the electronic device,

According to the moving speed of the electronic device, the strength of signals received from some of the other base stations is measured, and in response to the received information of the other base stations, the signals received from the some of the base stations are measured. Electronic device comprising a modem for transmitting the strength measurement result to the service base station.
The method of claim 6, wherein the service base station,

The electronic device according to the signal strength measurement result received from the electronic device, characterized in that the handover of the electronic device to one of the some of the base stations is performed.
7. The method of claim 6,

The modem is

Determining the some of the base stations according to the size of the coverage area of each of the other base stations,

The coverage area size of each of the base stations is,

Electronic device, characterized in that it is estimated according to the frequency of the RF band used by the base stations.
The method of claim 8, wherein the modem comprises:

Determining some of the base stations by excluding at least one having a frequency equal to or higher than a preset reference frequency among RF bands that the electronic device can support,

The reference frequency is

Electronic device, characterized in that determined according to the moving speed of the electronic device.
10. The method of claim 9, wherein the reference frequency,

An electronic device, characterized in that the faster the moving speed of the electronic device is, the lower it is, and the lower the moving speed of the electronic device is, the higher it is.
In the handover method of an electronic device,

a first step of receiving information of other adjacent base stations from a service base station connected to the electronic device for communication when a preset handover condition is satisfied;

a second step of detecting signal strengths received from each of the received other base stations and detecting a moving speed of the electronic device;

Transmitting measurement information (Measurement Report) including the detected signal strength detection result for each other base station and the detection result of the moving speed of the electronic device to the service base station in response to the received information of other base stations third step; and;

When information for handover is received from the service base station to one of some base stations according to the detected moving speed of the electronic device among the signal strength detection results for each other base station, the handover to the one base station A handover method of an electronic device comprising a fourth step of transmitting information for
The method of claim 11, wherein the service base station,

Based on the frequency of each of the RF bands supported by the electronic device, the size of the coverage area of each of the other base stations is estimated, and based on the estimated size of the coverage area, the partial base station is detected and , The handover method of an electronic device, characterized in that, based on the signal strength detection results of the some of the base stations among the measurement information received from the electronic device, one of the base stations to perform the handover is determined.
The method of claim 11, wherein the service base station,

Further comprising a memory including information on the size of the coverage area of each of the other base stations,

Based on the coverage area size of each of the other base stations, the partial base station is detected, and the handover is performed based on the signal strength detection results of the some of the measurement information received from the electronic device. A handover method of an electronic device, comprising determining one base station.
The method of claim 11, wherein the measurement information,

As a result of detecting the moving speed of the electronic device, the handover method of an electronic device comprising information indicating whether the moving speed of the electronic device exceeds or does not exceed a preset speed.