`
`
`as) United States
`
`
`
`
`
`
`
`
`
`a2) Patent Application Publication 10) Pub. No.: US 2010/0112940 Al
`
`
`
`
`
`
`
` Yoon (43) Pub. Date: May6, 2010
`
`
`
`
`US 20100112940A1
`
`
`
`
`
`
`
`
`(54) APPARATUS AND METHOD FOR
`IMPROVING DATA TRANSMISSION SPEED
`
`
`
`
`
`
`
`OF TERMINAL TRANSMITTING DATA
`USING NEAR FIELD COMMUNICATION
`
`
`
`
`SCHEME
`
`
`
`
`
`
`
`(30)
`
`
`
`
`Foreign Application Priority Data
`
`
`
`
`Nov. 5, 2008
`
`
`
`
`
`(KR) woeeeceeceeeseteteees 10-2008-0109403
`
`
`
`
`Publication Classification
`
`
`
`.
`
`
`
`
`Inventor:
`Young-Ho Yoon, Suwon-si (KR)
`
`
`Correspondence Address:
`
`
`
`Jefferson IP Law, LLP
`1130 Connecticut Ave., NW, Suite 420
`
`
`
`
`
`
`
`
`Washington, DC 20036 (US)
`
`
`
`
`Samsung Electronics Co., Ltd.,
`
`
`Suwon-si (KR)
`
`
`
`
`
`
`
`
`
`(75)
`
`
`(73) Assignee:
`
`
`
`(21) Appl. No.:
`
`
`
`12/504,423
`
`
`
`(22)
`
`
`
`Filed:
`
`
`
`
`
`Jul. 16, 2009
`
`
`
`
`
`(51)
`
`
`
`
`
`Int. Cl.
`(2006.01)
`HOAB 5/00
`
`
`
`
`
`
`
`(52) US. Ch.cece ce ceeeneeeeeseeeseeceeeeenee 455/41.1
`
`
`ABSTRACT
`(67)
`
`
`
`
`
`
`
`An apparatus and a method for improving data transmission
`
`
`
`
`
`
`
`
`speed in a terminal transmitting data using a Near Field Com-
`
`
`
`
`
`
`
`munication (NFC)
`scheme are provided. The method
`
`
`
`
`
`
`includes measuring NFC power, detecting a modulation
`
`
`
`
`
`
`
`scheme corresponding to the measured NFC powerfrom an
`
`
`
`
`
`
`
`
`approximate powertable, modulating data using the detected
`
`
`
`
`
`
`
`modulation scheme, and transmitting the modulated data
`
`
`
`
`using the NFC scheme.
`
`108
`
`
`
`
`
`110
`
`
`
`
`
`
`
`112
`
`
`
`
`
`
`
`|—
`
`DISPLAY UNIT k— CONTROLLER
`
`
`
`
`
`
`STORAGE UNIT 744
`106
`aw
`
`
`
`
`
`
`APPROXIMATE
`NE
`
`POWER TABLE
`
`OMMUNICATION|
`C
`
`7
`UN
`
`
`
`
`INPUT UNIT
`
`
`
`
`
`192
`
`
`
`NFC POWER
`
`
`MEASURING UNIT
`
`[|
`
`
`104
`
`
`MODULATION
`
`SCHEME DETECTOR
`
`|
`
`
`
`
`190
`
`
`
`
`
`
`
`
`
`
`
`
`>
`
`
`——>
`
`
`
`
`
`
`
`Page | of 8
`
`SAMSUNG EXHIBIT 1019
`
`Page 1 of 8
`
`SAMSUNG EXHIBIT 1019
`
`

`

`
`
`Patent Application Publication
`
`
`
`
`
`
`May6, 2010 Sheet 1 of 3
`
`
`
`
`US 2010/0112940 Al
`
`
`
`
`|YOLOSISGSWSHOS
`NOLWINGOW
`
`
`
`YSTIO“LNOO
`
`AINAAvidSIG
`
`90h|,
`
`OJN
`
`jNOLLVOINAWAIO0O
`
`
`
`
`
`
`IvitUNA3OvHOLS
`
`ALVAIXObdd
`
`
`
`JTaV1HAMOd
`
`201
`
`
`
`YIMOdOIN
`
`
`
`LINDONTENSV3N
`
`
`
` ~001
`
`801
`
`LINALAdNI
`
`rerOlt
`
`
`
`
`Page 2 of 8
`
`
`
`
`
`
`
`
`
`Page 2 of 8
`
`
`
`
`
`
`

`

`
`Patent Applica
`
`
`tion Publication
`
`
`
`
`
`
`May 6, 2010 Sheet 2 of 3
`
`
`
`
`US 2010/0112940 Al
`
`YES
`
`
`
`
`
`
`
`
`
`
`
`MEASURE NFC POWER
`
`
`INITIALIZE N =1
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`215
`
`
`
`
`
`201
`~
`DATA “<_
`
`TRANSMISSION MENU
`
`
`
`USING NFC SCHEME
`
`
`ty, SELECTED?
`
`
`
`
`
`3\COMPARE
`
`
`
`~~
`
`
`POWER THRESHOLD
`
`
`
`
`WITH NFC POWER USING
`
`
`
`APPROXIMATE POWER TABLE
`
`
`
`(1<NFC POWER
`
`< ttl
`
`
`
`YES
`
`
`
`
`DETECT MODULATION SCHEME
`
`
`CORRESPONDING TO rt FROM
`
`
`
`
`APPROXIMATE POWER TABLE
`
`
`
`
`
`
`
`MODULATE DATA USING DETECTED —Ott
`
`
`MODULATION SCHEME
`
`
` TRANSMIT DATA
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`Page 3 of 8
`
`
`
`
`
`
`
`
`
`Page 3 of 8
`
`

`

`
`
`Patent Application Publication
`
`
`
`
`
`
`May 6, 2010 Sheet 3 of 3
`
`
`
`
`US 2010/0112940 Al
`
`6
`
`
`
`
`
`BER GRAPH
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`{ ho L
`
`
`10” |
`
`
`10% |
`
`
`
`
`
`—— APPROXIMATE BER
`
`
`
`—*— EXACT BER
`
`
`
`
`a0
`1 +
`
`191%
`0
`
`
`
`
`
`i
`5
`
`
`
`tu
`a
`
`Page 4 of 8
`
`10
`
`
`
`4
`15
`
`
`
`20
`
`i
`
`25
`
`POWER dB
`
`
`
`l
`30
`
`
`
`35
`
`
`
`40
`
`
`
`|
`45
`
`
`
`RIG.S
`
`
`
`Page 4 of 8
`
`

`

`
`
`
`US 2010/0112940 Al
`
`
`May6, 2010
`
`
`
`APPARATUS AND METHOD FOR
`
`
`
`
`IMPROVING DATA TRANSMISSION SPEED
`
`
`
`OF TERMINAL TRANSMITTING DATA
`
`
`
`
`USING NEAR FIELD COMMUNICATION
`
`
`
`
`SCHEME
`
`
`
`
`PRIORITY
`
`
`
`
`
`
`
`
`
`
`
`[0001] This application claimsthe benefit under 35 U.S.C.
`
`
`
`
`
`
`
`
`§119(a) of a Korean patent application filed in the Korean
`
`
`
`
`
`
`
`Intellectual Property Office on November 5, 2008 and
`
`
`
`
`
`
`
`assigned Serial No. 10-2008-0109403, the entire disclosure
`
`
`
`
`
`of which is hereby incorporated by reference.
`
`BACKGROUND OF THE INVENTION
`
`
`
`
`
`
`
`
`
`1. Field of the Invention
`[0002]
`
`
`
`
`
`
`
`[0003] The present invention relates to an apparatus and a
`
`
`
`
`
`
`
`method for transmitting data using a Near Field Communi-
`
`
`
`
`
`
`
`
`cation (NFC) scheme. Moreparticularly, the present inven-
`
`
`
`
`
`
`
`tion relates to an apparatus and a method for improving data
`
`
`
`
`
`
`transmission speed of a terminal transmitting data using an
`NFCscheme.
`
`
`
`
`
`
`
`[0004]
`2. Description of the Related Art
`
`
`
`
`
`
`[0005] As communication apparatuses and equipment
`
`
`
`
`
`
`develop, mobile communication terminals have become an
`
`
`
`
`
`
`essential element to everyday life. As a result, communication
`
`
`
`
`
`
`
`terminal services requiring high bandwidth, such as Elec-
`
`
`
`
`
`
`tronic (E)-mail, Digital Multimedia Broadcasting (DMB),
`
`
`
`
`
`
`
`Digital Audio Broadcasting (DAB) and Digital Video Broad-
`
`
`
`
`
`
`casting-Handheld (DVB-H), have increased. Also, as per-
`sonal mobile communication terminals such as cellular
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`phones and Personal Digital Assistants (PDAs) are used, a
`
`
`
`
`
`
`short distance communication scheme is necessary which
`does not need a basestation.
`
`
`
`
`
`
`
`
`
`
`
`
`[0006] Near Field Communication (NFC)isa type ofRadio
`
`
`
`
`
`
`Frequency IDentification (RFID) which is a short distance
`communication schemethat does not need a basestation. The
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`NFC is a non-contact wireless communication technique
`
`
`
`
`
`
`
`
`
`which may transmit data using a simple process and low
`
`
`
`
`
`power within a maximum distance of 20 cm via a frequency
`
`
`
`
`
`
`
`
`
`of 13.56 MHz. According to the NFC, when two or more
`
`
`
`
`
`
`
`
`
`terminals are put close to each other, even withoutartificial
`
`
`
`
`
`
`manipulation of a user, basic information, such as a phone
`
`
`
`
`
`
`
`
`number, and data, such as an MP3file and images, may be
`transmitted and received between the terminals. The NFC
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`supports transmission speeds of 106 kbps, 212 kbps and 424
`
`
`
`
`
`
`
`kbps, and is currently applied to a personal mobile commu-
`
`
`
`
`
`
`
`nication apparatus, such as a cellular phone. However, since
`
`
`
`
`
`
`
`
`the NFC uses a fixed modulation scheme (for example,
`
`
`
`
`
`
`
`
`Amplitude Shift Keying (ASK) and Phase Shift Keying
`
`
`
`
`(PSK)), transmission speed is low.
`
`
`
`
`
`
`[0007] According to a long distance communication
`
`
`
`
`
`
`
`
`scheme whichuses a general cellular phone network, such as
`
`
`
`
`
`
`
`Global System for Mobile communications (GSM), General
`
`
`
`
`
`
`
`
`Packet Radio Service (GPRS) and Code Division Multiple
`
`
`
`
`
`
`
`
`Access (CDMA), data transmission speed and a Bit Error
`
`
`
`
`
`
`
`
`
`Rate (BER) vary depending on time and space dueto a path
`
`
`
`
`
`
`
`loss by multipath fading. Therefore, a base station determines
`
`
`
`
`
`
`
`
`
`the BER and control power, and transmits data using a fixed
`
`
`
`
`
`
`
`modulation method. In a case of using a cellular phone net-
`
`
`
`
`
`
`
`work, such as High-Speed Downlink Packet Access (HS-
`
`
`
`
`
`
`
`
`DPA), a base station transmits data using an AMC scheme.
`
`Page 5 of 8
`
`
`
`
`
`
`
`
`
`
`
`Thatis, the base station determines a target BER and power,
`
`
`
`
`
`
`
`
`and transmits data using a modulation schemesuitable for the
`
`power.
`
`
`
`
`
`
`
`[0008] As described above, in a data transmission scheme
`
`
`
`
`
`
`
`which uses a conventional cellular phone network, a base
`
`
`
`
`
`
`
`
`station exists and a complicated process maybe applied to the
`
`
`
`
`
`
`conventional cellular phone network. Accordingly, a trans-
`
`
`
`
`
`
`
`mission speed maybe increased to meet circumstances ofthe
`
`
`
`
`
`
`
`complicated process. However, inan NFC scheme which uses
`
`
`
`
`
`
`a Point-to-Point schemewithouta base station, a complicated
`
`
`
`
`
`
`
`process is difficult to apply. Therefore, the NFC has a limit in
`
`
`
`
`
`
`transmission speed due to a simple communication process
`
`
`
`and low power.
`
`
`
`
`
`
`
`[0009] Therefore, a need exists for an apparatus and
`
`
`
`
`
`method for improving data transmission speed of a commu-
`nication terminal.
`
`
`
`
`
`
`SUMMARY OF THE INVENTION
`
`
`
`
`
`
`
`
`
`
`
`
`[0010] An aspect of the present invention is to address at
`
`
`
`
`
`
`least the above-mentioned problems and/or disadvantages
`
`
`
`
`
`
`
`and to provide at
`least the advantages described below.
`
`
`
`
`
`
`Accordingly, an aspect of the present invention is to provide
`
`
`
`
`
`
`
`
`an apparatus and a method for improving data transmission
`
`
`
`
`
`
`
`
`speed of a terminal which transmits data using a Near Field
`
`
`
`Communication (NFC) scheme.
`
`
`
`
`
`
`[0011] Another aspect ofthe present inventionis to provide
`
`
`
`
`
`
`
`
`an apparatus and a method for improving data transmission
`
`
`
`
`
`
`
`
`speed of a terminal which transmits data using an NFC
`
`
`
`
`
`
`schemeby generating an approximate powertable represent-
`
`
`
`
`
`
`
`
`ing a powerthreshold for each modulation scheme using an
`
`
`
`
`
`
`
`
`approximate Bit Error Rate (BER) equation, and applying
`
`
`
`
`
`
`
`Adaptive Modulation & Code (AMC) to the NFC scheme
`
`
`
`
`
`using the approximate powertable.
`
`
`
`
`
`
`
`[0012]
`In accordance with an aspect of the present inven-
`
`
`
`
`
`
`
`tion, a data transmission method using a NFC scheme in a
`
`
`
`
`
`
`mobile communication terminal is provided. The method
`
`
`
`
`
`
`includes measuring NFC power, detecting a modulation
`
`
`
`
`
`
`
`scheme corresponding to the measured NFC power in an
`
`
`
`
`
`
`
`
`approximate powertable, modulating data using the detected
`
`
`
`
`
`
`
`modulation scheme, and transmitting the modulated data
`
`
`
`
`using the NFC scheme.
`
`
`
`
`
`
`
`
`[0013]
`In accordance with another aspect of the present
`
`
`
`
`
`
`
`invention, a data transmission apparatus using an NFC
`
`
`
`
`
`
`schemein a mobile communication terminal is provided. The
`
`
`
`
`
`
`
`
`apparatus includes an NFC power measuring unit for mea-
`
`
`
`
`
`
`
`
`suring NFC power, a storage unit for storing an approximate
`
`
`
`
`
`
`
`powertable, a modulation scheme detector for detecting a
`
`
`
`
`
`
`modulation scheme corresponding to the measured NFC
`
`
`
`
`
`
`
`
`
`power from the approximate powertable, and an NFC com-
`
`
`
`
`
`
`
`
`
`munication unit for modulating data using the detected modu-
`
`
`
`
`
`
`
`
`
`lation schemeandfor transmitting the modulated data using
`the NFC scheme.
`
`
`
`
`
`
`
`
`
`
`
`[0014]
`In accordance with another aspect of the present
`
`
`
`
`
`
`
`invention, a data transmission apparatus using an NFC
`
`
`
`
`
`
`schemein a mobile communication terminal is provided. The
`
`
`
`
`
`
`
`
`apparatus includes an NFC power measuring unit for mea-
`
`
`
`
`
`
`
`
`suring NFC power, a modulation schemedetector for extract-
`
`
`
`
`
`
`
`
`
`ing an approximate power table from a storage unit and
`
`
`
`
`
`
`detecting a modulation scheme corresponding to the mea-
`
`
`
`
`
`
`
`
`
`sured NFC powerfrom the approximate powertable, and an
`
`
`
`
`
`
`
`
`NFC communication unit for modulating data using the
`
`
`
`
`
`
`
`detected modulation scheme, and for transmitting the modu-
`
`
`
`
`
`
`lated data using the NFC scheme.
`
`Page 5 of 8
`
`

`

`
`
`
`US 2010/0112940 Al
`
`
`May6, 2010
`
`
`
`
`
`
`
`
`
`
`[0015] Other aspects, advantages, and salient features of
`
`
`
`
`
`
`
`
`
`the invention will become apparentto those skilled in the art
`
`
`
`
`
`
`
`
`from the following detailed description, which, taken in con-
`
`
`
`
`
`
`
`junction with the annexed drawings, discloses exemplary
`embodiments of the invention.
`
`
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`
`
`
`
`
`
`
`
`
`
`
`
`[0016] The above and other aspects, features and advan-
`
`
`
`
`
`
`
`tages of certain exemplary embodimentsofthe present inven-
`
`
`
`
`
`
`
`
`tion will be more apparent from the following description
`
`
`
`
`
`
`taken in conjunction with the accompanying drawings, in
`which:
`
`
`
`
`
`
`
`[0017] FIG.1isa block diagram illustrating an apparatus of
`
`
`
`
`
`
`
`
`
`a terminal for transmitting data using a Near Filed Commu-
`
`
`
`
`
`
`nication (NFC) scheme according to an exemplary embodi-
`
`
`
`mentof the present invention;
`
`
`
`
`
`
`[0018]
`FIG. 2 isa flowchart illustrating a methodfor allow-
`
`
`
`
`
`
`
`
`ing a terminalto transmit data using an NFC scheme accord-
`
`
`
`
`
`
`
`ing to an exemplary embodimentofthe present invention; and
`
`
`
`
`
`
`[0019]
`FIG. 3 is a graph comparing a conventional Adap-
`
`
`
`
`
`
`
`tive Modulation & Coding (AMC)applying method with an
`
`
`
`
`
`
`
`AMCapplying method using an approximate power table
`
`
`
`
`
`according to an exemplary embodimentof the present inven-
`tion.
`
`
`
`
`
`
`
`
`[0020] Throughout the drawings, like reference numerals
`
`
`
`
`
`
`
`
`will be understood to refer to like parts, components and
`structures.
`
`
`
`
`DETAILED DESCRIPTION OF EXEMPLARY
`
`
`EMBODIMENTS
`
`
`
`
`
`
`
`
`[0021] The following description with reference to the
`
`
`
`
`
`accompanying drawingsis providedto assist in a comprehen-
`
`
`
`
`
`sive understanding of exemplary embodiments of the present
`
`
`
`
`
`
`
`invention as defined by the claims and their equivalents. It
`
`
`
`
`
`
`
`includesvariousspecific details to assist in that understanding
`
`
`
`
`
`
`
`
`but these are to be regarded as merely exemplary. Accord-
`
`
`
`
`
`
`
`
`
`
`ingly, those of ordinary skill in the art will recognize that
`
`
`
`
`
`
`
`various changes and modifications of the embodiments
`
`
`
`
`
`
`
`
`described herein can be made without departing from the
`
`
`
`
`
`
`
`scope andspirit of the invention. Also, descriptions of well-
`
`
`
`
`
`
`
`
`
`known functions and constructions are omitted for clarity and
`conciseness.
`
`
`
`
`
`
`
`
`
`
`[0022] The terms and wordsused in the following descrip-
`
`
`
`
`
`
`
`
`
`tion and claimsare not limited to the bibliographical mean-
`
`
`
`
`
`
`
`
`ings, but, are merely used bythe inventorto enable a clear and
`
`
`
`
`
`
`consistent understanding of the invention. Accordingly, it
`
`
`
`
`
`
`
`
`should be apparentto thoseskilled in the art that the following
`
`
`
`
`
`description of exemplary embodiments of the present inven-
`
`
`
`
`
`
`
`
`
`
`
`tion are providedfor illustration purpose only and notfor the
`
`
`
`
`
`
`
`purposeoflimiting the invention as defined by the appended
`
`
`
`
`claims andtheir equivalents.
`
`
`
`
`
`
`
`
`
`
`It is to be understood that the singular forms “a,”
`[0023]
`
`
`
`
`
`
`
`
`
`“an,” and “the” include plural referents unless the context
`
`
`
`
`
`
`
`clearly dictates otherwise. Thus, for example, reference to “a
`
`
`
`
`
`
`
`componentsurface”includes reference to one or more of such
`surfaces.
`
`
`
`
`
`
`
`
`
`
`
`[0024] By the term “substantially” it is meant that the
`
`
`
`
`
`
`
`
`recited characteristic, parameter, or value need not be
`
`
`
`
`
`
`
`achieved exactly, but that deviations or variations, including
`
`
`
`
`
`
`for example, tolerances, measurement error, measurement
`
`
`
`
`
`
`
`
`accuracy limitations and other factors knownto thoseofskill
`
`
`
`
`
`
`
`
`
`
`
`in the art, may occur in amountsthat do not preclude the effect
`
`
`
`
`
`the characteristic was intended to provide.
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`[0025] Exemplary embodiments of the present invention
`
`
`
`
`
`
`provide an apparatus and a methodfor improving data trans-
`
`
`
`
`
`
`
`mission speed of a terminal which transmits data using a Near
`
`
`
`
`
`
`Field Communication (NFC) scheme by generating an
`
`
`
`
`
`
`approximate powertable representing a power threshold for
`
`
`
`
`
`
`
`each modulation schemeusing an approximate Bit Error Rate
`
`
`
`
`
`
`(BER) equation, and applying Adaptive Modulation & Cod-
`
`
`
`
`
`
`
`
`ing (AMC) to the NFC schemeusing the approximate power
`table.
`
`
`
`
`
`
`
`
`[0026]
`Inacase of the NFC, since communication is per-
`
`
`
`
`
`
`
`
`formed using Line Of Sight (LOS)in a short distance range
`
`
`
`
`
`
`
`
`within a maximum of 20 cm, multipath fading doesnotexist.
`
`
`
`
`
`
`
`Therefore, a BER determination and complicated power con-
`
`
`
`
`
`
`
`
`trol are not used in real-time during data communication.
`
`
`
`
`
`
`Instead, an approximate powertable representing a power
`
`
`
`
`
`
`
`threshold for each modulation scheme using an approximate
`
`
`
`
`
`
`
`BER equation may be generated, and then AMC may be
`
`
`
`
`
`
`
`
`applied to the NFC scheme using the approximate power
`table.
`
`
`
`
`
`
`
`
`
`[0027] Assuming that the number of bits which may be
`
`
`
`
`
`
`
`transmitted per symbol in an NFCsystem is n, a powerthresh-
`
`
`
`
`
`
`
`
`
`old which maytransmit n bits per symbolfor T times may be
`
`
`
`
`
`determined using Equation (1) below.
`
`
`Ye = BER, (0.001)
`
`
`
`
`
`qd)
`
`
`
`
`
`
`
`
`[0028]
`Inanexemplary implementation, when Equation (1)
`
`
`
`
`
`
`
`is arranged in terms of BER of n-ary Quadrature Amplitude
`
`
`
`
`
`
`
`Modulation (QAM), assuming that a minimum BER(target
`
`
`
`
`
`
`
`BER), 1.e., BERj, which may perform communication, is a
`
`
`
`
`
`
`constant, Equation (1) may be expressed as an approximate
`
`
`
`
`
`BERequation shown in Equation (2).
`
`Yh —InSBERo)(2" -1)
`
`
`
`@)
`
`
`
`
`
`
`
`
`
`
`
`[0029]
`In Equation (2), BER, is variably set depending on
`
`
`
`
`
`
`
`
`the type of data. Therefore, Equation (2) may generate an
`
`
`
`
`
`
`
`approximate powertable representing a power threshold for
`
`
`
`
`
`
`
`
`each modulation scheme using the approximate BER equa-
`
`
`
`
`tion shown in Equation (2).
`
`
`
`
`
`
`
`the
`[0030]
`For example, assuming that BER,=0.0001,
`
`
`
`
`
`
`approximate power table may be generated as in Table 1
`below.
`
`
`TABLE 1
`
`
`
`
`
`
`n (Spectral Efficiency)
`1
`
`2
`
`3
`
`4
`
`5
`
`6
`
`7
`
`8
`
`
`
`
`
`Yr’ [dB]
`5.4805
`
`10.2517
`
`13.9314
`
`17.2414
`
`20.3914
`
`23.4739
`
`26.5185
`
`29.5459
`
`
`
`
`Modulation
`BPSK
`
`QPSK
`
`8QAM
`16QAM
`32QAM
`64QAM
`128QAM
`256QAM
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`[0031] Therefore, during data transmission, AMC may be
`
`
`
`
`
`
`
`
`applied to the NFC scheme using the approximate power
`
`
`
`
`
`
`
`
`table without BER determination and powercontrol. Thatis,
`
`
`
`
`
`
`
`
`
`a terminal which intends to transmit data using the NFC
`
`Page 6 of 8
`
`Page 6 of 8
`
`

`

`
`
`
`US 2010/0112940 Al
`
`
`May6, 2010
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`scheme measures NFC power and compares the measured
`
`
`
`
`
`
`
`NFCpowerwith a powerthreshold ofthe approximate power
`
`
`
`table as in Equation (3).
`(3)
`rf" <NFCPower <r7"*!
`
`
`
`
`
`
`
`
`[0032] Here, in the case where a maximum valueis set to n
`
`
`
`
`
`
`
`
`
`
`in the approximate powertable, since n+1 does not exist,
`
`
`
`
`
`
`
`
`rt; ==NFCPower needs to be met rather than Equation (3).
`
`
`
`
`
`
`Subsequently, r," meeting Equation (3) is searched and a
`
`
`
`
`
`
`modulation scheme corresponding to the r,” searched from
`
`
`
`
`
`
`
`
`the approximate powertable is detected. Data is then modu-
`
`
`
`
`
`
`
`
`lated and transmitted using the detected modulation scheme.
`
`
`
`
`
`
`
`[0033]
`For example, in a case of using the approximate
`
`
`
`
`
`
`
`powertable shownin Table 1, a modulation schemeofdata is
`
`
`
`
`
`
`
`
`detected as described below and data may be modulated and
`transmitted.
`
`
`
`
`power<10.2517
`5.4805SNFC
`[0034]
`
`
`
`
`
`
`
`==—=====>modulate using Binary Phase-Shift Key-
`
`
`ing (BPSK)
`
`
`
`power<13.9314
`[0035]
`10.2517SNFC
`
`
`
`
`
`
`==—=—===>modulate using Quadrature Phase-Shift
`
`
`Keying (QPSK)
`
`
`power<17.2414
`13.9314NFC
`[0036]
`
`
`
`
`
`===>modulate using 8 QAM
`
`
`
`power<20.3914
`[0037]
`17.2414SNFC
`
`
`===>modulate using 16 QAM
`
`
`
`power<23.4739
`20.3914SNFC
`[0038]
`
`
`
`
`===>modulate using 32 QAM
`
`
`power<26.5185
`[0039]
`23.4739SNFC
`
`
`
`
`
`===>modulate using 64 QAM
`
`
`power<29.5459
`[0040]
`26.5185SNFC
`
`
`
`===>modulate using 128 QAM
`
`
`
`29.5459=NFC power
`==—=—=—=>modulate
`[0041]
`
`
`
`using 256 QAM
`
`
`
`
`
`
`[0042] FIG.1isa block diagram illustrating an apparatus of
`
`
`
`
`
`
`
`
`
`aterminalfor transmitting data using an NFC scheme accord-
`
`
`
`
`
`ing to an exemplary embodimentof the present invention.
`
`
`
`
`
`
`
`
`[0043] As illustrated in FIG. 1, the terminal includes a
`
`
`
`
`
`
`
`
`controler 100, an NFC power measuring unit 102, a modu-
`
`
`
`
`
`
`
`
`lation scheme detector 104, an NFC communication unit 106,
`
`
`
`
`
`
`
`
`
`
`
`an input unit 108, a display unit 110 and a storage unit 112.
`
`
`
`
`
`
`
`[0044] Referring to FIG. 1, the controller 100 performs a
`
`
`
`
`
`
`
`control and process for an overall operation of the terminal.
`
`
`
`
`
`
`
`
`Moreparticularly, the controller 100 performs a control and
`
`
`
`
`
`
`
`
`process for improving data transmission speedofthe terminal
`
`
`
`
`
`
`
`
`whichtransmits data using an NFC schemeby applying AMC
`
`
`
`
`
`
`
`
`
`to the NFC schemeusing an approximate powertable 114.
`
`
`
`
`
`
`
`
`
`[0045] The NFC power measuring unit 102 measures NFC
`
`
`
`
`
`
`poweraccording to a user’s selection of a data transmission
`menu which uses the NFC scheme.
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`[0046] The modulation schemedetector 104 extracts the
`
`
`
`
`
`
`
`
`
`approximate power table 114 from the storage unit 112
`
`
`
`
`
`
`
`
`according to the user’s selection of the data transmission
`menu which uses the NFC scheme. The modulation scheme
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`detector 104 then detects a modulation schemecorresponding
`
`
`
`
`
`
`
`
`
`to the NFC power measured by the NFC power measuring
`
`
`
`
`
`
`
`
`
`unit 102 from the extracted approximate powertable 114.
`
`
`
`
`
`
`
`That is, the modulation scheme detector 104 compares a
`
`
`
`
`
`
`
`
`
`powerthreshold for each modulation scheme with the mea-
`
`
`
`
`
`
`
`
`sured NFC power using the extracted approximate power
`
`
`
`
`
`
`
`
`table 114, thereby determining whether the measured NFC
`
`
`
`
`
`
`
`
`power meets Equation (3). When the measured NFC power
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`meets Equation (3), the modulation scheme detector 104
`
`
`
`
`
`
`
`detects a modulation scheme which meets Equation (3) and
`
`
`
`
`
`
`
`correspondsto r;" from the approximate powertable 114.
`
`
`
`
`
`
`
`[0047] The NFC communication unit 106 transmits/re-
`ceives data to/from a different terminal located in an area
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`where data transmission using the NFC schemeis possible.
`
`
`
`
`
`
`
`
`Moreparticularly, the NFC communication unit 106 modu-
`
`
`
`
`
`
`
`
`lates data using the modulation scheme detected by the modu-
`
`
`
`
`
`
`
`
`
`lation scheme detector 104, and transmits the modulated data
`
`
`
`
`using the NFC scheme.
`
`
`
`
`
`
`
`
`[0048] The input unit 108 includesa plurality of function
`
`
`
`
`
`
`
`keys, and provides data corresponding to a key pressed by the
`
`
`
`
`
`
`
`
`
`
`userto the controller 100. The display unit 110 displays state
`
`
`
`
`
`
`
`information, numbers andletters generated during an opera-
`tion of the terminal.
`
`
`
`
`
`
`
`
`
`
`
`
`[0049] The storage unit 112 stores programs used for an
`
`
`
`
`
`
`
`
`overall operation of the terminal and various information.
`
`
`
`
`
`
`
`
`
`Moreparticularly, the storage unit 112 stores the approximate
`
`
`
`
`
`
`
`
`
`powertable 114. Here, the approximate powertable 114 is a
`
`
`
`
`
`
`
`table regarding a power threshold for each modulation
`
`
`
`
`
`
`
`
`scheme. The power threshold for each modulation scheme
`
`
`
`
`
`
`
`may be determined using the approximate BER equation
`
`
`
`shown in Equation (2).
`
`
`
`
`
`FIG. 2 isa flowchart illustrating a methodfor allow-
`[0050]
`
`
`
`
`
`
`
`ing a terminalto transmit data using an NFC scheme accord-
`
`
`
`
`
`ing to an exemplary embodimentofthe present invention.
`
`
`
`
`
`
`
`
`[0051] Referring to FIG.2, in step 201, the terminal deter-
`mines whether a data transmission menu which uses the NFC
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`schemeis selected by a user’s key manipulation. When the
`selection of the data transmission menu which uses the NFC
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`schemeis detected, the terminal measures NFC powerin step
`
`
`
`
`
`
`
`
`203, and performsinitialization by setting n=1 in step 205.
`
`
`
`
`
`
`
`
`Here, n denotes the numberof bits which may be transmitted
`
`
`per symbol.
`
`
`
`
`
`
`
`
`
`[0052]
`In step 207, the terminal determines whether the
`
`
`
`
`
`
`
`measured NFC power meets Equation (3) by comparing a
`
`
`
`
`
`
`
`
`
`powerthreshold for each modulation scheme with the mea-
`
`
`
`
`
`
`
`
`sured NFC powerusing an approximate power table. When
`
`
`
`
`
`
`
`
`
`
`the measured NFC power does not meet Equation (3), the
`
`
`
`
`
`
`
`
`
`terminal replaces n by n+1 in step 215, and returns to step 207
`
`
`
`
`
`to repeatedly perform subsequentsteps.
`
`
`
`
`
`
`
`[0053] On the other hand, when the measured NFC meets
`
`
`
`
`
`
`
`Equation (3), the terminal detects a modulation scheme cor-
`
`
`
`
`
`
`respondingto r,” meeting Equation (3) from the approximate
`
`
`
`
`powertable in step 209.
`
`
`
`
`
`
`
`
`
`[0054]
`In step 211, the terminal modulates data using the
`
`
`
`
`
`
`
`detected modulation scheme, and in step 213, the terminal
`transmits the modulated data.
`
`
`
`
`
`
`
`
`
`
`
`[0055] The terminal then endsthe process.
`
`
`
`
`
`
`FIG. 3 is a graph comparing a conventional AMC
`[0056]
`
`
`
`
`
`
`
`applying method with an AMC applying method using an
`
`
`
`
`
`
`approximate powertable according to an exemplary embodi-
`
`
`
`mentof the present invention.
`
`
`
`
`
`[0057] Referring to FIG. 3, according to the conventional
`
`
`
`
`
`
`
`
`AMCapplying method which uses a real BER, when 10000
`
`
`
`
`
`
`bit-data per powerof 0.5 dB is transmitted using 1024 QAM,
`
`
`
`
`
`
`
`a BER of 0.01% is generated. It is revealed that an AMC
`
`
`
`
`
`
`
`applying method whichusesthe approximate BERaccording
`
`
`
`
`
`
`to an exemplary embodiment of the present invention may
`
`
`
`
`
`generate a BERsubstantially similar to that of the conven-
`
`
`
`
`tional AMC applying method.
`
`
`
`
`
`
`[0058] As described above, exemplary embodiments ofthe
`
`
`
`
`
`
`
`present invention may improve data transmission speed by
`
`
`
`
`
`
`generating an approximate powertable representing a power
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`Page 7 of 8
`
`Page 7 of 8
`
`

`

`
`
`
`US 2010/0112940 Al
`
`
`May6, 2010
`
`
`
`
`
`
`
`
`
`
`
`7. The apparatus of claim 6, wherein the powerthreshold is
`
`
`
`
`
`
`
`
`determined using an approximate Bit Error Rate (BER) equa-
`tion shown below:
`
`
`
`
`ype ~ FinSBER,)(2" -1)
`
`
`
`
`
`
`
`
`
`
`threshold for each modulation scheme using an approximate
`
`
`
`
`
`
`
`
`
`BERequation, and applying AMC to the NFC schemeusing
`
`
`
`
`
`
`
`
`the approximate power table, thereby applying the AMC
`
`
`
`using a simple process.
`
`
`
`
`
`
`
`
`
`[0059] While the invention has been shown and described
`
`
`
`
`
`
`with reference to certain exemplary embodiments thereof, it
`
`
`
`
`
`
`
`
`
`will be understood by those skilled in the art that various
`
`
`
`
`
`
`
`
`changes in form and details may be madetherein without
`
`
`
`
`
`
`
`
`departing from the spirit and scope ofthe invention as defined
`
`
`
`
`
`
`by the appended claims and their equivalents.
`Whatis claimed is:
`
`
`
`
`
`
`
`
`
`1. A data transmission method using a Near Field Commu-
`
`
`
`
`
`
`nication (NFC) schemein a mobile communication terminal,
`
`
`
`the method comprising:
`
`
`
`measuring NFC power;
`
`
`
`
`
`detecting a modulation scheme corresponding to the mea-
`
`
`
`
`
`
`
`sured NFC powerusing an approximate powertable;
`
`
`
`
`
`
`
`modulating data using the detected modulation scheme;
`and
`
`
`
`
`
`
`
`
`
`transmitting the modulated data using the NFC scheme.
`
`
`
`
`
`
`
`2. The methodof claim 1, wherein the approximate power
`
`
`
`
`
`
`table comprises a table representing a power threshold for
`each modulation scheme.
`
`
`
`
`
`
`
`
`
`
`
`3. The method of claim 2, wherein the powerthresholdis
`
`
`
`
`
`
`
`
`determined using an approximate Bit Error Rate (BER) equa-
`tion shown below:
`
`
`
`
`
`
`
`
`
`2
`
`
`Yh =~ Zln(SBER)(2” — 1)
`
`
`
`
`
`
`
`
`
`wherein n is a number ofbits which is transmittable per
`
`
`
`
`
`
`
`symbol, r,” is a power threshold which may transmit n
`
`
`
`
`
`
`
`
`
`bits per symbol for T times, and BER,is a target BER
`
`
`
`
`
`
`which performs communication, BER, being a constant.
`
`
`
`
`
`
`
`4. The method of claim 2, wherein the detecting of the
`
`
`
`modulation scheme comprises:
`
`
`
`
`
`
`
`determining whether the measured NFC poweris included
`
`
`
`
`
`
`
`within a range between a k-th power threshold and a
`
`
`
`
`
`
`
`(k+1)-th power threshold of the approximate power
`
`
`table; and
`
`
`
`
`
`
`
`
`when the measured NFC poweris included within the
`
`
`
`
`
`range, detecting a modulation scheme corresponding to
`
`
`
`
`
`
`
`
`the k-th power threshold from the approximate power
`table.
`
`
`
`
`
`
`
`
`5. A data transmission apparatus using a Near Field Com-
`
`
`
`
`
`
`munication (NFC) schemein a mobile communication termi-
`
`
`
`
`nal, the apparatus comprising:
`
`
`
`
`
`
`
`
`
`an NFC power measuring unit for measuring NFC power;
`
`
`
`
`
`
`
`
`a storage unit for storing an approximate powertable;
`
`
`
`
`
`
`
`a modulation scheme detector for detecting a modulation
`
`
`
`
`
`
`
`scheme correspondingto the measured NFC powerfrom
`
`
`
`
`
`the approximate powertable; and
`
`
`
`
`
`
`
`
`an NFC communication unit for modulating data using the
`
`
`
`
`
`
`detected modulation scheme, and for transmitting the
`
`
`
`
`
`
`modulated data using the NFC scheme.
`
`
`
`
`
`
`
`
`6. The apparatus of claim 5, wherein the approximate
`
`
`
`
`
`
`
`powertable comprises a table representing a powerthreshold
`for each modulation scheme.
`
`
`
`
`
`
`
`
`Page 8 of 8
`
`
`
`
`
`
`
`wherein n is a numberof bits which is transmittable per
`
`
`
`
`
`
`
`symbol, r,” is a power threshold which maytransmit n
`
`
`
`
`
`
`
`
`
`bits per symbol for T times, and BER,is a target BER
`
`
`
`
`
`
`which performs communication, BER, being a constant.
`
`
`
`
`
`
`
`
`8. The apparatus of claim 6, wherein the modulation
`
`
`
`scheme detector comprises:
`
`
`
`
`
`
`
`
`a unit for determining whether the measured NFC poweris
`
`
`
`
`
`
`
`included within a range between a k-th powerthreshold
`
`
`
`
`
`
`
`and a (k+1)-th power threshold of the approximate
`
`
`
`powertable; and
`
`
`
`
`
`
`
`
`a unit for, when the measured NFC poweris included
`
`
`
`
`
`
`within the range, detecting a modulation schemecorre-
`
`
`
`
`
`
`
`sponding to the k-th power threshold from the approxi-
`
`
`
`mate powertable.
`
`
`
`
`
`
`
`9. A data transmission apparatus using a Near Field Com-
`
`
`
`
`
`
`munication (NFC) schemein a mobile communication termi-
`
`
`
`
`nal, the apparatus comprising:
`
`
`
`
`
`
`
`
`
`an NFC power measuring unit for measuring NFC power;
`
`
`
`
`
`
`
`a modulation scheme detector for extracting an approxi-
`
`
`
`
`
`
`
`
`mate power table from a storage unit and detecting a
`
`
`
`
`
`
`modulation scheme correspondingto the measured NFC
`
`
`
`
`
`
`
`power from the approximate powertable; and
`
`
`
`
`
`
`
`
`an NFC communication unit for modulating data using the
`
`
`
`
`
`
`detected modulation scheme, and for transmitting the
`
`
`
`
`
`
`modulated data using the NFC scheme.
`
`
`
`
`
`
`10. The apparatus of claim 9, wherein the approximate
`
`
`
`
`
`
`powertable comprises a table representing a powerthreshold
`for each modulation scheme.
`
`
`
`
`
`
`
`
`
`
`
`
`11. The apparatus ofclaim 10, wherein the powerthreshold
`
`
`
`
`
`
`
`is determined using an approximate Bit Error Rate (BER)
`
`
`
`equation shown below:
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`ype —InSBERo)(2" -1)
`
`
`
`
`
`
`
`
`
`wherein n is a numberof bits which is transmittable per
`
`
`
`
`
`
`
`symbol, r,” is a power threshold which may transmit n
`
`
`
`
`
`
`
`
`
`bits per symbol for T times, and BER,is a target BER
`
`
`
`
`
`
`which performs communication, BER, being a constant.
`
`
`
`
`
`
`
`
`12. The apparatus of claim 10, wherein the modulation
`
`
`
`scheme detector comprises:
`
`
`
`
`
`
`
`
`a unit for determining whether the measured NFC poweris
`
`
`
`
`
`
`
`included within a range