WO2014057940A1 - Appareil de communication sans fil et procédé de commande de communication - Google Patents

Appareil de communication sans fil et procédé de commande de communication Download PDF

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Publication number
WO2014057940A1
WO2014057940A1 PCT/JP2013/077353 JP2013077353W WO2014057940A1 WO 2014057940 A1 WO2014057940 A1 WO 2014057940A1 JP 2013077353 W JP2013077353 W JP 2013077353W WO 2014057940 A1 WO2014057940 A1 WO 2014057940A1
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Prior art keywords
wireless communication
data
communication system
unit
control unit
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PCT/JP2013/077353
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English (en)
Japanese (ja)
Inventor
一生 大西
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京セラ株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology

Definitions

  • the present invention relates to a wireless communication apparatus and a communication control method for receiving data by switching a plurality of wireless communication systems.
  • a wireless communication apparatus supports a plurality of wireless communication systems with different communication methods.
  • a wireless communication device has a function called “Optimized Handover” that seamlessly performs handover while continuing the IP address without disconnecting the TCP connection when straddling the communication area of each wireless communication system during data reception (For example, refer to Patent Document 1).
  • An object of the present invention is to provide a wireless communication apparatus and a communication control method capable of avoiding inconvenience when switching between wireless communication systems during data reception and appropriately receiving data.
  • a wireless communication apparatus includes a first wireless communication unit that receives data by a first wireless communication system, a second wireless communication unit that receives data by a second wireless communication system, and the first wireless communication unit.
  • a data communication control unit that transfers data received by the wireless communication unit or the second wireless communication unit via a route corresponding to the first wireless communication system or the second wireless communication system, When the data communication control unit performs switching from the first wireless communication system to the second wireless communication system during data reception, the switching is completed and a path corresponding to the second wireless communication system Do not make a communication connection reset request until
  • the communication connection reset request may be transmission of a TCP RST packet.
  • the determination of the route corresponding to the second wireless communication system may be performed based on reception of broadcast information of the second wireless communication system.
  • the data communication control unit may discard the data received by the second wireless communication unit until the switching is completed and the route is determined.
  • the wireless communication device may include a temporary storage unit that temporarily stores data received by the second wireless communication unit until the switching is completed and the route is determined.
  • the data communication control unit may notify that the data has been received when temporarily storing the data received by the second wireless communication unit.
  • the communication control method includes a first wireless communication unit that receives data by a first wireless communication system, a second wireless communication unit that receives data by a second wireless communication system, and the first wireless communication unit.
  • a data communication control unit configured to transfer data received by the second wireless communication unit or the second wireless communication unit through a route corresponding to the first wireless communication system or the second wireless communication system.
  • the wireless communication device can avoid inconvenience when switching the wireless communication system during data reception, and can receive data appropriately.
  • the smartphone 1 has a housing 20.
  • the housing 20 includes a front face 1A, a back face 1B, and side faces 1C1 to 1C4.
  • the front face 1 ⁇ / b> A is the front of the housing 20.
  • the back face 1 ⁇ / b> B is the back surface of the housing 20.
  • the side faces 1C1 to 1C4 are side faces that connect the front face 1A and the back face 1B.
  • the side faces 1C1 to 1C4 may be collectively referred to as the side face 1C without specifying which face.
  • the smartphone 1 has a touch screen display 2, buttons 3A to 3C, an illuminance sensor 4, a proximity sensor 5, a receiver 7, a microphone 8, and a camera 12 on the front face 1A.
  • the smartphone 1 has a camera 13 on the back face 1B.
  • the smartphone 1 has buttons 3D to 3F and an external interface 14 on the side face 1C.
  • the buttons 3A to 3F may be collectively referred to as the button 3 without specifying which button.
  • the touch screen display 2 has a display 2A and a touch screen 2B.
  • the display 2A includes a display device such as a liquid crystal display (Liquid Crystal Display), an organic EL panel (Organic Electro-Luminescence panel), or an inorganic EL panel (Inorganic Electro-Luminescence panel).
  • the display 2A displays characters, images, symbols, graphics, and the like.
  • the touch screen 2B detects contact of a finger or a stylus pen with respect to the touch screen display 2.
  • the touch screen 2B can detect a position where a plurality of fingers, a stylus pen, or the like is in contact with the touch screen display 2.
  • the detection method of the touch screen 2B may be any method such as a capacitance method, a resistive film method, a surface acoustic wave method (or an ultrasonic method), an infrared method, an electromagnetic induction method, and a load detection method.
  • a finger that the touch screen 2B detects contact with the touch screen display 2 or a stylus pen or the like may be simply referred to as a “finger”.
  • the smartphone 1 determines the type of gesture based on the contact, contact position, contact time, or number of contacts detected by the touch screen 2B.
  • the gesture is an operation performed on the touch screen display 2.
  • the gesture discriminated by the smartphone 1 includes touch, long touch, release, swipe, tap, double tap, long tap, drag, flick, pinch in, pinch out, and the like.
  • Touch is a gesture in which a finger touches the touch screen display 2 (for example, the surface).
  • the smartphone 1 determines a gesture in which a finger contacts the touch screen display 2 as a touch.
  • the long touch is a gesture in which a finger contacts the touch screen display 2 for a predetermined time or more.
  • the smartphone 1 determines a gesture in which a finger contacts the touch screen display 2 for a predetermined time or more as a long touch.
  • Release is a gesture in which a finger leaves the touch screen display 2.
  • the smartphone 1 determines a gesture in which a finger leaves the touch screen display 2 as a release.
  • the swipe is a gesture that moves while the finger is in contact with the touch screen display 2.
  • the smartphone 1 determines a gesture that moves while the finger is in contact with the touch screen display 2 as a swipe.
  • the tap is a gesture for releasing following a touch.
  • the smartphone 1 determines a gesture for releasing following a touch as a tap.
  • the double tap is a gesture in which a gesture for releasing following a touch is continued twice.
  • the smartphone 1 determines a gesture in which a gesture for releasing following a touch is continued twice as a double tap.
  • Long tap is a gesture that releases after a long touch.
  • the smartphone 1 determines a gesture for releasing following a long touch as a long tap.
  • the drag is a gesture for performing a swipe from an area where a movable object is displayed.
  • the smartphone 1 determines, as a drag, a gesture for performing a swipe starting from an area where a movable object is displayed.
  • a flick is a gesture that is released while a finger moves at high speed in one direction following a touch.
  • the smartphone 1 determines, as a flick, a gesture that is released while the finger moves in one direction at high speed following the touch.
  • Flick Up flick that moves your finger up the screen, Down flick that moves your finger down the screen, Right flick that moves your finger right in the screen, Left flick that moves your finger left in the screen Etc.
  • the pinch-in is a gesture that swipes in the direction in which multiple fingers approach each other.
  • the smartphone 1 determines, as a pinch-in, a gesture that swipes in a direction in which a plurality of fingers approach each other.
  • Pinch-out is a gesture that swipes a plurality of fingers away from each other.
  • the smartphone 1 determines a gesture of swiping in a direction in which a plurality of fingers move away from each other as a pinch out.
  • the smartphone 1 operates according to these gestures determined via the touch screen 2B. Therefore, operability that is intuitive and easy to use for the user is realized.
  • the operation performed by the smartphone 1 according to the determined gesture differs depending on the screen displayed on the touch screen display 2.
  • FIG. 4 is a block diagram showing the configuration of the smartphone 1.
  • the smartphone 1 includes a touch screen display 2, a button 3, an illuminance sensor 4, a proximity sensor 5, a communication unit 6, a receiver 7, a microphone 8, a storage 9, a controller 10, and cameras 12 and 13. , An external interface 14, an acceleration sensor 15, an orientation sensor 16, and a rotation detection sensor 17.
  • the touch screen display 2 has the display 2A and the touch screen 2B as described above.
  • the display 2A displays characters, images, symbols, graphics, or the like.
  • the touch screen 2B detects a gesture.
  • the button 3 is operated by the user.
  • the button 3 has buttons 3A to 3F.
  • the controller 10 detects an operation on the button by cooperating with the button 3.
  • the operation on the button is, for example, click, double click, push, and multi-push.
  • buttons 3A to 3C are a home button, a back button, or a menu button.
  • the button 3D is a power on / off button of the smartphone 1.
  • the button 3D may also serve as a sleep / sleep release button.
  • the buttons 3E and 3F are volume buttons.
  • the illuminance sensor 4 detects illuminance.
  • the illuminance is light intensity, brightness, luminance, or the like.
  • the illuminance sensor 4 is used for adjusting the luminance of the display 2A, for example.
  • the proximity sensor 5 detects the presence of a nearby object without contact.
  • the proximity sensor 5 detects that the touch screen display 2 is brought close to the face, for example.
  • the communication unit 6 communicates wirelessly.
  • the communication method performed by the communication unit 6 is a wireless communication standard.
  • wireless communication standards include cellular phone communication standards such as 2G, 3G, and 4G.
  • communication standards for cellular phones include LTE (Long Term Evolution), W-CDMA, CDMA2000, PDC, GSM (registered trademark), PHS (Personal Handy-phone System), and the like.
  • Examples of wireless communication standards include WiMAX (Worldwide Interoperability for Microwave Access), IEEE 802.11, Bluetooth (registered trademark), IrDA, NFC (Near Field Communication), and the like.
  • the communication unit 6 may support one or more of the communication standards described above.
  • the receiver 7 outputs the audio signal transmitted from the controller 10 as audio.
  • the microphone 8 converts the voice of the user or the like into a voice signal and transmits it to the controller 10.
  • the smartphone 1 may further include a speaker in addition to the receiver 7.
  • the smartphone 1 may further include a speaker instead of the receiver 7.
  • the storage 9 stores programs and data.
  • the storage 9 is also used as a work area for temporarily storing the processing result of the controller 10.
  • the storage 9 may include any storage device such as a semiconductor storage device and a magnetic storage device.
  • the storage 9 may include a plurality of types of storage devices.
  • the storage 9 may include a combination of a portable storage medium such as a memory card and a storage medium reading device.
  • the program stored in the storage 9 includes an application executed in the foreground or the background and a control program that supports the operation of the application.
  • the application displays a predetermined screen on the display 2A, and causes the controller 10 to execute processing according to the gesture detected by the touch screen 2B.
  • the control program is, for example, an OS.
  • the application and the control program may be installed in the storage 9 via wireless communication by the communication unit 6 or a storage medium.
  • the storage 9 stores, for example, a control program 9A, a mail application 9B, a browser application 9C, and setting data 9Z.
  • the mail application 9B provides an electronic mail function for creating, transmitting, receiving, and displaying an electronic mail.
  • the browser application 9C provides a WEB browsing function for displaying a WEB page.
  • the table 9D stores various tables such as a key assignment table.
  • the arrangement pattern database 9E stores arrangement patterns such as icons displayed on the display 2A.
  • the setting data 9Z provides various setting functions related to the operation of the smartphone 1.
  • the control program 9A provides functions related to various controls for operating the smartphone 1.
  • the control program 9A realizes a call by controlling the communication unit 6, the receiver 7, the microphone 8, and the like, for example.
  • the function provided by the control program 9A includes a function of performing various controls such as changing information displayed on the display 2A according to a gesture detected via the touch screen 2B. Note that the functions provided by the control program 9A may be used in combination with functions provided by other programs such as the mail application 9B.
  • the controller 10 is, for example, a CPU (Central Processing Unit).
  • the controller 10 may be an integrated circuit such as a SoC (System-on-a-chip) in which other components such as the communication unit 6 are integrated.
  • SoC System-on-a-chip
  • the controller 10 controls various operations of the smartphone 1 to realize various functions.
  • the controller 10 executes instructions included in the program stored in the storage 9 while referring to the data stored in the storage 9 as necessary, and the display 2A, the communication unit 6 and the like. Various functions are realized by controlling.
  • the controller 10 may change the control according to detection results of various detection units such as the touch screen 2B, the button 3, and the acceleration sensor 15.
  • the controller 10 executes various controls such as changing the information displayed on the display 2A according to the gesture detected via the touch screen 2B by executing the control program 9A, for example.
  • the camera 12 is an in-camera that captures an object facing the front face 1A.
  • the camera 13 is an out camera that captures an object facing the back face 1B.
  • the external interface 14 is a terminal to which other devices are connected.
  • the external interface 14 may be a general-purpose terminal such as USB (Universal Serial Bus), HDMI (High-Definition Multimedia Interface, registered trademark), Light Peak (Thunderbolt), and an earphone microphone connector.
  • the external interface 14 may be a dedicated terminal such as a dock connector.
  • Devices connected to the external interface 14 include, for example, an external storage, a speaker, and a communication device.
  • the acceleration sensor 15 detects the direction and magnitude of acceleration acting on the smartphone 1.
  • the direction sensor 16 detects the direction of geomagnetism.
  • the rotation detection sensor 17 detects the rotation of the smartphone 1. The detection results of the acceleration sensor 15, the azimuth sensor 16, and the rotation detection sensor 17 are used in combination in order to detect changes in the position and orientation of the smartphone 1.
  • FIG. 5 is a block diagram showing detailed functions of the communication unit 6 and the controller 10 in the smartphone 1.
  • the communication unit 6 includes a 4G communication unit 61 corresponding to LTE (first radio communication system) and a 3G communication unit 62 corresponding to eHRPD (enhanced High-Rate Packet Data, second radio communication system). Either one of the 4G communication unit 61 and the 3G communication unit 62 is selected, and receives the TCP data segment via the network of the corresponding wireless communication system.
  • LTE first radio communication system
  • 3G communication unit 62 corresponding to eHRPD (enhanced High-Rate Packet Data, second radio communication system).
  • the 4G communication unit 61 receives a handover instruction from the network, and instructs the 3G communication unit 62 to perform an optimized handover.
  • the 3G communication unit 62 takes over reception of the TCP data segment.
  • the controller 10 performs data communication control for transferring the data received by the application processing unit 101 that processes received data and the 4G communication unit 61 or the 3G communication unit 62 to the application processing unit 101 through a route corresponding to each wireless communication system.
  • Unit 102 The controller 10 performs data communication control for transferring the data received by the application processing unit 101 that processes received data and the 4G communication unit 61 or the 3G communication unit 62 to the application processing unit 101 through a route corresponding to each wireless communication system.
  • Unit 102 The controller 10 performs data communication control for transferring the data received by the application processing unit 101 that processes received data and the 4G communication unit 61 or the 3G communication unit 62 to the application processing unit 101 through a route corresponding to each wireless communication system.
  • the data communication control unit 102 When the data communication control unit 102 performs switching from the LTE wireless communication system to the eHRPD wireless communication system by the optimized handover while receiving the TCP data segment from the network, the data communication control unit 102 completes the switching and determines the route. The data received by the 3G communication unit 62 is discarded, but the communication connection reset request is not performed.
  • the route corresponding to the wireless communication system indicates a 4G or 3G dedicated interface, and is determined by acquiring broadcast information from the wireless communication system after switching. Thereby, the switching of the TCP / IP layer is completed, and the data communication control unit 102 can transfer the received data to the application processing unit 101.
  • the communication connection reset request specifically refers to a TCP connection reset request, that is, transmission of a TCP RST packet.
  • the server closes the port for transmitting the corresponding TCP data segment, and the TCP connection is disconnected.
  • the data communication control unit 102 does not transmit this TCP RST packet until the TCP / IP layer switching is completed, so the TCP connection is continued.
  • FIG. 6 is a sequence diagram illustrating a first process in the smartphone 1.
  • the smartphone 1 is assumed to receive data by the 4G communication unit 61 (LTE).
  • LTE 4G communication unit 61
  • step S1 the 4G communication unit 61 (LTE) receives a TCP data segment from the network, and the data communication control unit 102 transfers the received data to the application processing unit 101.
  • LTE Long Term Evolution
  • step S2 the data communication control unit 102 transmits a TCP ACK that is a reception confirmation to the network side via the 4G communication unit 61.
  • step S3 the 4G communication unit 61 receives a handover instruction (handoverFromEUTRAPreparationRequest) from the network as the radio field intensity decreases.
  • handoverFromEUTRAPreparationRequest a handover instruction
  • step S4 the 4G communication unit 61 instructs the 3G communication unit 62 (eHRPD) to perform optimized handover (H / O).
  • step S5 the 4G communication unit 61 notifies the data communication control unit 102 that the wireless communication system is to be switched (Optimized H / O start notification).
  • step S6 the 3G communication unit 62 makes a connection request (Connection Request) to the network.
  • step S7 the 3G communication unit 62 is assigned a communication channel from the network (TrafficChannelAssignment), and the wireless layer is switched from LTE to eHRPD.
  • step S8 the 3G communication unit 62 receives the TCP data segment continuously transmitted from the network, and transmits it to the data communication control unit 102.
  • step S9 the data communication control unit 102 discards the TCP data segment received in step S8 because an interface for transferring received data to the application processing unit 101 has not been established.
  • step S10 the data communication control unit 102 transmits the TCP RST packet to the network side via the 3G communication unit 62 because the TCP data segment is discarded in step S9.
  • step S11 the server that is the data transmission source on the network side closes the port for sending the TCP data segment, and disconnects the TCP connection.
  • step S12 when the reception of eHRPD broadcast information (OverHeadMessage) from the network is completed, the 3G communication unit 62 notifies the data communication control unit 102 of the network information extracted from the broadcast information (Optimized H / O completion notification). . As a result, the data communication control unit 102 establishes an interface for transferring received data to the application processing unit 101.
  • eHRPD broadcast information (OverHeadMessage)
  • the 3G communication unit 62 notifies the data communication control unit 102 of the network information extracted from the broadcast information (Optimized H / O completion notification).
  • the data communication control unit 102 establishes an interface for transferring received data to the application processing unit 101.
  • eHRPD broadcast information includes, for example, Quick Config (outline of own base station), Sector Parameters (information on own base station and other base stations in the same system), and Other RAT Neighbor List (neighboring base stations in other communication systems). Information).
  • the smartphone 1 preferably executes the following second process instead of the first process.
  • FIG. 7 is a sequence diagram showing a second process in the smartphone 1.
  • the smartphone 1 is assumed to receive data by the 4G communication unit 61 (LTE).
  • LTE 4G communication unit 61
  • Steps S1 to S9 are the same as those in the first process (FIG. 6).
  • step S10 in the first process is not executed. That is, the TCP data segment is discarded, but the data communication control unit 102 does not transmit the TCP RST packet. For this reason, the server that is the data transmission source on the network side continues the TCP connection without closing the port that transmits the TCP data segment.
  • step S 12 when the data communication control unit 102 establishes an interface for transferring received data to the application processing unit 101, a TCP data segment retransmitted from the network side is transferred to the application processing unit 101. That is, the data communication control unit 102 receives notification of network information extracted from the broadcast information (Optimized) during steps S5 to S12, that is, after receiving notification of switching of the wireless communication system (Optimized H / O start notification). Until receiving the (H / O completion notification), transmission of a TCP RST packet is suppressed (limited) at least when the TCP data segment is discarded.
  • the smartphone 1 when performing the optimized handover, the smartphone 1 does not transmit the TCP RST packet until the switching of the TCP / IP layer is completed. Therefore, when switching from LTE to eHRPD, the inconvenience of disconnecting the TCP connection is avoided, so that the smartphone 1 can receive data appropriately.
  • FIG. 8 is a block diagram showing detailed functions of the communication unit 6, the storage 9a, and the controller 10a in the smartphone 1a according to the present embodiment.
  • the storage 9a includes a buffer 91 (temporary storage unit) that temporarily stores data received by the 3G communication unit 62 until the TCP / IP layer switching by the optimized handover is completed.
  • a buffer 91 temporary storage unit
  • the data communication control unit 102a of the controller 10a temporarily stores the data received by the 3G communication unit 62 in the buffer 91 until the switching of the TCP / IP layer is completed and the path is determined. At this time, the data communication control unit 102a does not transmit the TCP RST packet as in the first embodiment. At this time, the data communication control unit 102a may transmit a TCP ACK to notify the network that the TCP data segment has been received.
  • the data communication control unit 102a transfers the temporarily stored TCP data segment to the application processing unit 101 and sends a TCP ACK via the 3G communication unit 62. Send to the network side.
  • the smartphone 1a transmits temporarily stored data to the application processing unit 101 when switching of the TCP / IP layer is completed when performing the optimized handover. Therefore, retransmission of data from the network side is suppressed, and improvement in throughput in data reception can be expected.
  • the optimized handover from 4G to 3G has been described.
  • the present invention is not limited to this, and the present invention may be applied to a handover from 3G to 4G. Further, the present invention may be applied to other wireless communication systems such as WiFi or WiMAX.
  • the configuration of the smartphone 1 illustrated in FIGS. 4, 5, and 8 is an example, and may be appropriately changed within a range that does not impair the gist of the present invention.
  • the application processing unit 101 and the data communication control unit 102 may be provided in different control devices such as CPUs.
  • 4 may be downloaded from another device through wireless communication by the communication unit 6. 4 may be stored in a storage medium that can be read by a reading device included in the storage 9. 4 is stored in a storage medium such as a CD, a DVD, or a Blu-ray (registered trademark) that can be read by a reader connected to the external interface 14. May be stored. Each program shown in FIG. 4 may be divided into a plurality of modules or may be combined with other programs.
  • a smartphone has been described as an example of a wireless communication device, but the wireless communication device is not limited to a smartphone.
  • the wireless communication device may be a mobile phone, a portable personal computer, a digital camera, a media player, an electronic book reader, a portable electronic device such as a navigator or a game machine, or a communication-dedicated module specialized for a communication function.
  • the wireless communication device may be a stationary electronic device such as a desktop personal computer or a television receiver.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)

Abstract

L'invention porte sur un appareil de communication sans fil et un procédé de commande de communication qui peuvent éviter des inconvénients lors d'une commutation de systèmes de communication sans fil durant une réception de données, ce qui permet de recevoir les données d'une manière appropriée. Un téléphone intelligent (1) comprend : une unité de communication 4G (61) qui reçoit des données en provenance d'un système LTE; une unité de communication 3G (62) qui reçoit des données en provenance d'un système eHRPD; et une unité de commande de communication de données (102) qui transfère les données reçues par l'intermédiaire de chemins correspondant aux systèmes de communication sans fil respectifs. Lors d'une commutation du système LTE au système eHRPD durant une réception de données, l'unité de commande de communication de données (102) ne demande pas une réinitialisation de la connexion TCP jusqu'à ce que la commutation soit achevée afin d'établir le chemin correspondant au système eHRPD.
PCT/JP2013/077353 2012-10-09 2013-10-08 Appareil de communication sans fil et procédé de commande de communication WO2014057940A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180034525A1 (en) * 2015-02-05 2018-02-01 Lg Electronics Inc. Method for csi feedback in wireless communication system, and apparatus therefor

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Publication number Priority date Publication date Assignee Title
WO2008029441A1 (fr) * 2006-09-04 2008-03-13 Panasonic Corporation Appareil de terminal de communication, système réseau et procédé de transfert
JP2012503385A (ja) * 2008-09-23 2012-02-02 パナソニック株式会社 信頼できない非３ｇｐｐネットワークへのハンドオーバの最適化
JP2012134753A (ja) * 2010-12-21 2012-07-12 Mitsubishi Electric Corp 無線中継装置および無線中継方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008029441A1 (fr) * 2006-09-04 2008-03-13 Panasonic Corporation Appareil de terminal de communication, système réseau et procédé de transfert
JP2012503385A (ja) * 2008-09-23 2012-02-02 パナソニック株式会社 信頼できない非３ｇｐｐネットワークへのハンドオーバの最適化
JP2012134753A (ja) * 2010-12-21 2012-07-12 Mitsubishi Electric Corp 無線中継装置および無線中継方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180034525A1 (en) * 2015-02-05 2018-02-01 Lg Electronics Inc. Method for csi feedback in wireless communication system, and apparatus therefor
US10637550B2 (en) * 2015-02-05 2020-04-28 Lg Electronics Inc. Method for CSI feedback in wireless communication system, and apparatus therefor

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