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`k tN .
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`. tY)
`3
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`ransmitted herewith for filing under 35 U.S.C. 111(a) and 37 C.F.R. 1.53(b) is a new utility patent application for an
`invention entitled:
`
`
`
`TUSTBASE‘STATI’ON APPKRATUS‘, AND RADIO
`
`OMMUNICATION METHOD
`
`
`ox Patent Application
`Washington, D.C. 20231
`
`
`
`
`
`12(Ia/b2
`
`A
`
`
`and invented by:
`
`
`
`en-EHi—NHYUSHI
`
`
`
`llllllllllllllllll
`no“
`samu KATO
`
`
`8D0-.
`unichi AIZAWA
`-:
`‘
`.,)~
`
`I:
`,
`
`
`If a CONTINUATION APPLICATION, check appropriate box and supply the requisite information:
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`C] Continuation-impart (CIP)
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`% Continuation D Divisional
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`CI Continuation
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` 1. Q Filing fee as calculated and transmitted as described below
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`2le Specification having A
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`68
`pages and including the following:
` 8 Descriptive Title of the Invention
` Cross References to Related Applications (if applicable) Statement Regarding Federally—sponsored Research/Development (if applicable)
`DUB Reference to Sequence Listing, a Table, or a Computer Program Listing Appendix
`
`10 1083;6317_s
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` I
`Background of the Invention
` E Brief Summary of the Invention
`
` a Brief Description of the Drawings (if filed)
`E Detailed Description
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` IE Claim(s) as Classified Below
`
` K Abstract of the Disclosure
`
`Page 1 ”[4
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`\ / IUTILITY PATENT APPLICATION TRANSMITTAL
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`Nucleotide and/or Amino Acid Sequence Submission (if applicable, all must be included)
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`12.
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`CI Copies of IDS Citations
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`14.
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`2] Return Receipt Postcard (MPEP 503) (Should be specifically itemized)
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`_| Certified Copy of Priority Document(s) (if foreign priority is claimed)
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`UTILITY PATENT APPLICATION TRANSMITTAL
`”£93215”
`{
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`Request That Application Not Be Published Pursuant To 35 U.S.C. 122(b)(2)
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` 18. CI Pursuant to 35 U.S.C. 122(b)(2), Applicant hereby requests that this patent application not be
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`published pursuant to 35 U.S.C. 122(b)(1). Applicant hereby certifies that the invention disclosed in
`this application has not and will not be the subject of an application filed in another country, or under
`a multilateral international agreement, that requires publication of applications 18 months after filing
`of the application.
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`Warning
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`country or under a multilateral international agreement specified in 35 US. C. 122(b)(2)(B)(i),
`must notify the Director of such filing not later than 45 days after the date of the filing of
`such foreign or international application. A failure of the applicant to provide such notice
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`

`_
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`-UT|LITY PATENT APPLICATION TRANSMI'ITAL
`(Large Entity)
`(Only for new nonprovisiona/ applications under 37 CFR 1.53(b))
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`Fee Calculation and Transmittal
`
`CLAIMS AS FILED
`
` #Allowed #Extra
`
`Total Claims
`
`
`20
`
`
`Indep. Claims
`
`OTHER FEE (specify purpose)
`
`PATENT TRADEMARK OFFICE
`
`2 M
`
`ultiple Dependent Claims (check if applicable)
`II
`BASIC FEE
`
`to cover the filing fee is enclosed.
`$740.00
`IZI A check in the amount of
`The Commissioner is hereby authorized to charge and credit Deposit Account No.
`as described below. A duplicate copy of this sheet is enclosed.
`CI Charge the amount of
`as filing fee.
`2 Credit any overpayment.
`El Charge any additional filing fees required under 37 C.F.R. 1.16 and 1.17_
`:I Charge the issue fee set in 37 C.F.R. 1.18 at the maili
`a
`he Notice of Allowance,
`pursuant to 37 C.F.R.1.311(b).
`
`
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`19-4375
`
`Dated: December 18, 2002
`
`llllllllllllllllllllllllllllllll
`
`24257 ‘
`
`. s E. Ledbetter, Esq.
`Registration No. 28,732
`STEVENS, DAVIS, MILLER & MOSHER, LLP
`
`:3::i.::;::,:-:ii::m
`
`Tel: 202-785-0100
`Fax: 202—408-5200
`
`Page 4 of 4
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`

`hM"“Q,‘
`n‘,
`
`
`
`IN THE UNITED STATES PATENT AND TRADEMARK OFFICE
`
`In re the Application
`
`Inventors:
`
`Kenichi MIYOSHI, et a1.
`
`Appln. No.:
`
`New Continuation Application of
`10/089,605 filed April 1, 2002
`
`Filed:
`
`December 18, 2002
`
`For:
`
`COMMUNICATION TERMINAL APPARATUS, BASE STATION
`APPARATUS, AND RADIO COMMUNICATION METHOD
`
`PRELIMINARY AMENDMENT
`
`Assistant Commissioner of Patents
`Washington, D.C. 20231
`
`Sir:
`
`Please amend the above-captioned application as follows:
`
`IN THE SPECIFICATION
`
`Please insert the following paragraph at page 1, between lines
`
`4 and 5:
`
`--This is a continuation of application number 10/089,605
`
`filed April 1, 2002.--
`
`IN THE CLAIMS
`
`Please amend claims 1-20
`
`to read as
`
`follows
`
`(Exhibit
`
`I
`
`contains a marked up version):
`
`1.
`
`(Amended) A communication terminal apparatus used in a
`
`communication system in.which communication resources are allocated
`
`IPR2018-01474
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`

`

`
`
`to each communication terminal apparatus based on downlink channel
`
`quality, said communication terminal apparatus comprising:
`
`a measurer that measures downlink channel quality; and
`
`a transmitter that transmits a notification signal to notify
`
`a base station apparatus of
`
`information that
`
`indicates
`
`said
`
`downlink channel quality;
`
`wherein said notification signal
`
`includes information made
`
`less susceptible to errors in a propagation path,
`
`the information,
`
`among
`
`information indicative
`
`of
`
`channel quality,
`
`having
`
`a
`
`possibility of decreasing the
`
`downlink
`
`throughput when
`
`the
`
`information is received erroneously in said base station apparatus.
`
`2.
`
`(Amended) The communication terminal apparatus according
`
`to claim 1, wherein
`
`said transmitter
`
`transmits with less
`
`susceptibility to errors in a propagation path in proportion to a
`
`notification signal
`
`that
`
`indicates that said downlink channel
`
`quality is good.
`
`3.
`
`(Amended) The communication terminal apparatus according
`
`to claim 2, wherein said transmitter transmits with transmission
`
`power
`
`increased in proportion to a notification signal
`
`that
`
`indicates that said downlink channel quality is good.
`
`|PR2018—01474
`
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`

`
`
`4.
`
`(Amended) The communication terminal apparatus according
`
`to claim 3,
`
`further
`
`comprising a controller
`
`that
`
`controls
`
`transmission power of a pilot signal,
`
`wherein said transmitter transmits with a notification signal
`
`that
`
`indicates
`
`said downlink channel quality better
`
`than a
`
`predetermined channel quality set to higher transmission power than
`
`pilot signal
`
`transmission power, and a notification signal
`
`that
`
`indicates said downlink channel quality'poorer than a predetermined
`
`channel quality set to lower transmission power than pilot signal
`
`transmission power.
`
`5.
`
`(Amended) The communication terminal apparatus according
`
`to claim 3, further comprising:
`
`a table that indicates a correspondence between a notification
`
`signal and transmission power; and
`
`a rewriter that rewrites contents of said table in accordance
`
`with a control signal from a base station apparatus,
`
`wherein said transmitter adjusts a notification signal
`
`to
`
`predetermined transmission power based on said table.
`
`6.
`
`(Amended) The communication terminal apparatus according
`
`to claim 2, wherein said transmitter transmits after performing
`
`conversion to a code word with a size of
`
`a code word minimum
`
`
`
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`

`
`
`distance proportional to a notification signal that indicates that
`
`said downlink channel quality is good.
`
`7.
`
`(Amended) The communication terminal apparatus according
`
`to claim 6, further comprising:
`
`a table that indicates a correspondence between a notification
`
`signal and a code word; and
`
`a rewriter that rewrites contents of said table in accordance
`
`with a control signal from a base station apparatus,
`
`wherein said transmitter converts a notification signal to a
`
`predetermined code word based on said table.
`
`8.
`
`(Amended) The communication terminal apparatus according
`
`to claim 2,
`
`further comprising a determiner
`
`that determines a
`
`communication mode indicated by a combination of modulation method
`
`and coding method based on channel quality,
`
`wherein said transmitter makes a notification signal a signal
`
`that indicates a communication mode.
`
`9.
`
`(Amended) The communication terminal apparatus according
`L
`
`to claim 2, wherein:
`
`said measurer measures pilot signal reception quality) and
`
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`

`
`
`said transmitter makes a notification signal a signal
`
`that
`
`indicates a pilot signal reception quality value.
`
`10.
`
`(Amended) The communication terminal apparatus according
`
`to claim 1, wherein:
`
`said measurer measures pilot signal reception quality; and
`
`said transmitter transmits a notification signal made less
`
`susceptible to errors in a propagation. path in proportion to
`
`information for which an amount of
`
`change
`
`is
`
`large within
`
`information used to indicate a pilot signal
`
`reception quality
`
`value.
`
`11.
`
`The communication terminal apparatus according to claim
`
`10, wherein said transmitter
`
`transmits
`
`a notification signal
`
`converted to a code word whose code length is proportional to a
`
`value of an upper digit.
`
`12.
`
`The communication terminal apparatus according to claim
`
`10, wherein said transmitter transmits a notification signal with
`
`transmission power increased in proportion to a value of an upper
`
`digit.
`
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`
`
`13.
`
`The communication terminal apparatus according to claim
`
`10, wherein said transmitter transmits a notification signal spread
`
`with a
`
`spreading code whose
`
`spreading factor
`
`is higher
`
`in
`
`proportion to a value of an upper digit.
`
`14.
`
`(Amended) A base station apparatus comprising:
`
`a receiver that receives a notification signal
`
`transmitted
`
`from the communication terminal apparatus according to claim 17
`
`allocation using a notification signal
`
`excluding a detected
`
`notification signal
`
`from a received plurality of notification
`
`signals.
`
`15. The base station apparatus according to claim 14, further
`
`comprising:
`
`a calculator that calculates a rate of detection by said
`
`detector; and
`
`a transmitter that transmits a control signal instructing a
`
`communication terminal apparatus to rewrite said table based on a
`
`6
`
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`

`

`
`
`result of comparison of a rate of detection and a predetermined
`
`threshold value.
`
`16.
`
`(Amended) A base station apparatus comprising:
`
`a receiver that receives a notification signal
`
`transmitted
`
`from the communication terminal apparatus according to claim 1;
`
`a measurer that measures likelihood of a notification signal;
`
`a detector that detects a notification signal whose likelihood
`
`is less than a predetermined threshold valuey and
`
`a determiner that determines downlink communication resource
`
`allocation using a notification signal
`
`excluding a detected
`
`notification signal
`
`from a received. plurality of notification
`
`signals.
`
`17. The base station apparatus according to claim 16, further
`
`comprising:
`
`a calculator that calculates a rate of detection by said
`
`detector) and
`
`a transmitter that transmits a control signal instructing a
`
`communication terminal apparatus to rewrite said table based on a
`
`result of comparison of a rate of detection and a predetermined
`
`threshold value.
`
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`

`
`
`18.
`
`(Amended) A radio communication method, wherein:
`
`a
`
`communication terminal apparatus, when
`
`transmitting a
`
`notification signal
`
`to notify a base
`
`station apparatus of
`
`information that indicates downlink channel quality,
`
`transmits a
`
`notification signal having information made less susceptible to
`
`errors in a propagation path,
`
`the information,
`
`among information
`
`indicative of said downlink channel quality, having a possibility
`
`of decreasing the downlink throughput when the information is
`
`received erroneously in said base station apparatus; and
`
`said base station determines downlink communication resource
`
`allocation in accordance with a notification signal.
`
`19.
`
`(Amended) The radio communication method according to
`
`claim 18, wherein said communication terminal apparatus transmits
`
`with less susceptibility to errors in a propagation path in
`
`proportion to a notification signal
`
`that
`
`indicates that said
`
`downlink channel quality is good.
`
`20.
`
`The radio communication method according to claim 18,
`
`wherein said communication terminal apparatus measures pilot signal
`
`reception quality, and transmits a notification signal made less
`
`susceptible to errors in a propagation path in proportion.
`
`to
`
`|PR2018—01474
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`

`

`
`
`information for which an
`
`amount of
`
`change
`
`is
`
`large within
`
`information used to indicate a reception quality value.
`
`|PR2018—01474
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`

`

`
`
`REMARKS
`
`This application is directed to original claims 1-20 which are
`
`amended for clarity.
`
`The amendments are considered to be non-
`
`narrowing and no estoppel should be deemed to attach thereto.
`
`Early and favorable consideration of
`
`this application is
`
`respectfully requested.
`
`Date: December 16, 2002
`
`JEL/spp
`
`Respectfully submitted,
`
`1 bLNWR
`
`:3 E. Ledbetter
`
`
`
`Registration No. 28,732
`
`ATTORNEY DOCKET NO. L9289.021493
`
`STEVENS, DAVIS, MILLER & MOSHER, L.L.P.
`1615 L Street, NW, Suite 850
`P.O. Box 34387
`
`20043-4387
`Washington, DC
`Telephone:
`(202) 785-0100
`Facsimile:
`(202) 408-5200
`
`10
`
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`

`
`
`Exhibit I
`
`1.
`
`(Amended) A communication terminal apparatus used in a
`
`communication system in which communication resources are
`
`allocated to each communication terminal apparatus based on
`
`downlink channel quality, said communication terminal apparatus
`
`comprising:
`
`a [measuring device] measurer that measures downlink channel
`
`quality; and
`
`a transmitter that transmits a notification signal to notify
`
`a base station apparatus of information that indicates said
`
`downlink channel quality;
`
`wherein said [transmitter transmits a] notification signal
`
`[having]
`
`includes information made less susceptible to errors in a
`
`propagation path,
`
`the information, among information indicative of
`
`channel quality, having a possibility of decreasing the downlink
`
`throughput when the information is received erroneously in said
`
`base station apparatus.
`
`2.
`
`(Amended) The communication terminal apparatus according
`
`to claim 1, wherein said transmitter transmits with less
`
`susceptibility to errors in a propagation path in proportion to a
`
`notification signal that indicates that said downlink channel
`
`quality is good.
`
`11
`
`|PR2018—01474
`
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`
`

`

`
`
`3.
`
`(Amended) The communication terminal apparatus according
`
`to claim 2, wherein said transmitter transmits with transmission
`
`power increased in proportion to a notification signal that
`
`indicates that said downlink channel quality is good.
`
`4.
`
`(Amended) The communication terminal apparatus according
`
`to claim 3, further comprising a controller that controls
`
`transmission power of a pilot signal
`
`[71L
`
`wherein said transmitter transmits with a notification
`
`signal that indicates said downlink channel quality better than a
`
`predetermined channel quality set to higher transmission power
`
`than pilot signal transmission power, and a notification signal
`
`that indicates said downlink channel quality poorer than a
`
`predetermined channel quality set to lower transmission power
`
`than pilot signal transmission power.
`
`5.
`
`(Amended) The communication terminal apparatus according
`
`to claim 3, further comprising:
`
`a table that indicates a correspondence between a
`
`notification signal and transmission power; and
`
`12
`
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`

`
`
`a [rewriting device] rewriter that rewrites contents of said
`
`table in accordance with a control signal from a base station
`
`apparatus[7]L
`
`wherein said transmitter adjusts a notification signal to
`
`predetermined transmission power based on said table.
`
`6.
`
`(Amended) The communication terminal apparatus according
`
`to claim 2, wherein said transmitter transmits after performing
`
`conversion to a code word with a size of a code word minimum
`
`distance proportional to a notification signal that indicates
`
`that said downlink channel quality is good.
`
`7.
`
`(Amended) The communication terminal apparatus according
`
`to claim 6, further comprising:
`
`a table that indicates a correspondence between a
`
`notification signal and a code word; and
`
`a [rewriting device] rewriter that rewrites contents of said
`
`table in accordance with a control signal from a base station
`
`apparatus[)]L
`
`wherein said transmitter converts a notification signal to a
`
`predetermined code word based on said table.
`
`13
`
`|PR2018—01474
`
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`
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`

`

`
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`8.
`
`(Amended) The communication terminal apparatus according
`
`to claim 2, further comprising a [determination device]
`
`determiner that determines a communication mode indicated by a
`
`combination of modulation method and coding method based on
`
`channel qualitylrlL
`
`wherein said transmitter makes a notification signal a
`
`signal that indicates a communication mode.
`
`9.
`
`(Amended) The communication terminal apparatus according
`
`to claim 2, wherein:
`
`said [measurement device] measurer measures pilot signal
`
`reception quality; and
`
`said transmitter makes a notification signal a signal that
`
`indicates a pilot signal reception quality value.
`
`10.
`
`(Amended) The communication terminal apparatus
`
`according to claim 1, wherein:
`
`said [measurement device] measurer measures pilot signal
`
`reception quality; and
`
`said transmitter transmits a notification signal made less
`
`susceptible to errors in a propagation path in proportion to
`
`information for which an amount of change is large within
`
`14
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`information used to indicate a pilot signal reception quality
`value.
`
`11.
`
`The communication terminal apparatus according to claim
`
`10, wherein said transmitter transmits a notification signal
`
`converted to a code word whose code length is proportional to a
`
`value of an upper digit.
`
`12.
`
`The communication terminal apparatus according to claim
`
`10, wherein said transmitter transmits a notification signal with
`
`transmission power increased in proportion to a value of an upper
`
`digit.
`
`13.
`
`The communication terminal apparatus according to claim
`
`10, wherein said transmitter transmits a notification signal
`
`spread with a spreading code whose spreading factor is higher in
`
`proportion to a value of an upper digit.
`
`14.
`
`(Amended) A base station apparatus comprising:
`
`a receiver that receives a notification signal transmitted
`
`from the communication terminal apparatus according to claim 1;
`
`a [measurement device] measurer that measures reception
`
`power of a notification signal;
`
`15
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`a detector that detects a notification signal whose
`
`reception power is less than a predetermined threshold value; and
`
`a [determination device] determiner that determines downlink
`
`communication resource allocation using a notification signal
`
`excluding a detected notification signal from a received
`
`plurality of notification signals.
`
`15.
`
`The base station apparatus according to claim 14,
`
`further comprising:
`
`a calculator that calculates a rate of detection by said
`
`detector; and
`
`a transmitter that transmits a control signal instructing a
`
`communication terminal apparatus to rewrite said table based on a
`
`result of comparison of a rate of detection and a predetermined
`
`threshold value.
`
`16.
`
`(Amended) A base station apparatus comprising:
`
`a receiver that receives a notification signal transmitted
`
`from the communication terminal apparatus according to claim 1;
`
`a [measurement device] measurer that measures likelihood of
`
`a notification signal;
`
`a detector that detects a notification signal whose
`
`likelihood is less than a predetermined threshold value; and
`
`16
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`u.
`
`
`
`a [determination device] determiner that determines downlink
`
`communication resource allocation using a notification signal
`
`excluding a detected notification signal from a received
`
`plurality of notification signals.
`
`17.
`
`The base station apparatus according to claim 16,
`
`further comprising:
`
`a calculator that calculates a rate of detection by said
`
`detector; and
`
`a transmitter that transmits a control signal instructing a
`
`communication terminal apparatus to rewrite said table based on a
`
`result of comparison of a rate of detection and a predetermined
`
`threshold value.
`
`18.
`
`(Amended) A radio communication method, wherein:
`
`a
`
`communication terminal apparatus, when
`
`transmitting a
`
`notification signal
`
`to notify a base
`
`station apparatus
`
`of
`
`information that indicates downlink channel quality,
`
`transmits a
`
`notification signal having information made less susceptible to
`
`errors in a propagation path,
`
`the information,
`
`among information
`
`indicative of said downlink channel quality, having a possibility
`
`of decreasing the downlink throughput when the information is
`
`received erroneously in said base station apparatus; and
`
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`.ug
`:1: MIL,
`
`
`
`said base station determines downlink communication resource
`
`allocation in accordance with a notification signal.
`
`19.
`
`(Amended) The radio communication method according to
`
`claim 18, wherein said communication terminal apparatus transmits
`
`with less susceptibility to errors
`
`in a propagation path in
`
`proportion to a notification signal
`
`that
`
`indicates that said
`
`downlink channel quality is good.
`
`20.
`
`The radio communication method according to claim 18,
`
`wherein said communication terminal apparatus measures pilot
`
`signal reception quality, and transmits a notification signal
`
`made less susceptible to errors in a propagation path in
`
`proportion to information for which an amount of change is large
`
`within information used to indicate a reception quality value.
`
`18
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`
`
`DESCRIPTION
`
`COMMUNICATIONTERMINALAPPARATUS,BASESTATIONAPPARATUS,
`
`AND RADIO COMMUNICATION METHOD
`
`Technical Field
`
`The present
`
`invention relates to a communication
`
`terminal apparatus, base station apparatus, and
`
`radio communication method to be used in a cellular
`
`10
`
`communication system.
`
`Background Art
`
`Inacellularcommunicationsystem,onebasestation
`
`performs radio communication with a plurality of
`
`15
`
`communication terminals simultaneously, and therefore,
`
`as demand has increased in recent years, so has the need
`
`for higher transmission efficiency.
`
`Onetechnologythathasbeenproposedforincreasing
`
`20
`
`the transmission efficiency of a downlink from a base
`station to‘a communication terminal
`is HDR (High Data
`
`Rate).
`
`HDR is a communication method whereby a base
`
`stationperformsschedulingforallocatingcommunication
`
`resources to communication terminals by time division,
`and also sets a transmission rate for each communication
`
`25
`
`terminal according to the downlink channel quality.
`
`The operations by which a base station and
`
`communicationterminalsperformradiocommunicationwith
`
`HDR are described below. First,
`
`the base station
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`transmits apilot signalto eachcommunicationterminal.
`
`Each communication terminal estimates the downlink
`
`channel quality using a CIR (desired carrier to
`
`interference ratio) based on the pilot signal, etc., and
`
`finds a transmission rate at which communication is
`
`possible. Then, based on the transmission rate at which
`
`communication is possible, each communication terminal
`
`selects a communication mode, which is a combination of
`
`packet.length, coding method, andIHOdulationlnethod, and
`
`transmits a data rate control (hereinafter referred to
`
`as “DRC”) signal indicating the communication mode td
`
`the base station.
`
`i
`
`The type of modulation method that can be used in
`
`eachsystemjjspredeterminedas BPSK,QPSK,16QAM,64QAM,
`
`and so forth. Also, the type of coding that can be used
`
`in each system is predetermined as 1/2 turbo code,
`
`l/3
`
`turbo code, 3/4 turbo code, and so forth. Further,
`
`a
`
`plurality of transmission rates that can be used in each
`
`system are predetermined according to a combination of
`
`packet
`
`length, modulation method, and coding method.
`
`Eachcommunicationterminalselectsacombinationwhereby
`
`communication can beperformed most efficiently with the
`
`current downlink channel quality, and transmits a DRC
`
`signalindicatingtheselectedcommunicationmode tothe
`
`10
`
`15
`
`20
`
`'25
`
`base station. Generally, DRC signals are represented by
`
`numbers from 1 to N, with a higher number indicating a
`
`proportionally better downlink channel quality.
`
`Based on the DRC signal transmitted from each
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`communication terminal,
`
`the base station sets a
`
`transmission rate for each communication terminal, and
`
`sendsasignaltoeachcommunicationterminalviaacontrol
`channel indicating communication.resource allocation to
`
`each communication terminal. Generally,
`
`taking
`
`improvement of system transmission efficiency into
`
`consideration, communication resources are allocated
`
`With priority to the communication terminal that has the
`
`best downlink channel quality—that
`
`iS‘tO say,
`
`the
`
`communication terminal that transmits the
`
`‘
`highest—numbered DRC signal.
`The base station then transmits data only to the
`
`relevant communication terminal in its allocated time.
`
`Forexample,iftimetlhasbeenallocatedtocommunication
`
`terminal A,
`
`in time t1 the base station transmits data
`
`only to communication terminal A, and does not transmit
`
`datatoeacommunicationterminalotherthancommunication
`
`terminal A.
`
`In this way, data transmission efficiency has
`
`conventionally been increased for the overall system.by
`
`setting a transmission rate for each communication
`
`terminal according to channel quality by means of HDR,
`
`and performing communication resource allocation with
`
`priority to a communication terminal with a high
`
`transmission rate at which communication is possible.
`
`However, if the communication mode determined by
`
`a communication terminal is receiVed erroneously by the
`
`base station due to deterioration of the channel
`
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`conditionscu1theuplinkfronlthecommunicationterminal
`
`to the base station, or the like, the base station will
`
`transmit data using that erroneous mode. As the
`
`determinedcommunicationmodeandthecommunicationmode
`
`of data transmitted to the communication terminal are
`
`different, the communication terminal cannot demodulate
`
`or decode the data.
`
`Also, when a base Station such as that described
`
`above has allocated time tl to communication terminal
`
`A,
`
`in time t1 the base station transmits data only to
`
`communication terminal A, and does not transmit data to
`
`a communication terminal other than communication
`
`terminal A.
`
`bue to the above, a problem arises in that, if the
`
`communicationmodedeterminedbyacommunicationterminal
`
`is received erroneously by the base station, there will
`
`be an interval during which time-divided communication
`
`resources are not used, and downlink throughput falls.
`
`10
`
`15
`
`20
`
`Disclosure of Invention
`
`It is an object of the present invention to provide
`
`a communication terminal apparatus, base station
`
`apparatus, and radio communication method that make it
`
`possible to prevent a fall in downlink throughput in a
`
`25
`
`communication system in which communication resources
`
`are allocated to communication terminals based on
`
`downlink channel quality.
`
`In order to achieve the above-described object, in
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`
`
`thepresentinvention,withrespecttoinformation,among
`
`informationindicativeofdownlinkchannelquality,which
`
`has a possibility of decreasing the downlink throughput
`when the information is received erroneously in a baSe
`station,
`a communication terminal provides such
`
`information with less susceptibility to errors in the
`
`propagation path to transmit. It is thereby possible to
`
`prevent
`
`the downlink throughput
`
`from decreasing.
`
`10
`
`Brief Description of Drawings
`
`FIG.1 is a graph illustrating DRC signal selection
`
`frequency in a base station;
`
`FIG.2 is a block diagram showing a configuration
`
`ofaibasestationaccordingtoEmbodiment].ofthepresent
`
`15
`
`invention;
`
`20
`
`25
`
`FIG.3 is a block diagram showing the configuration
`
`of a communication terminal according to Embodiment
`
`l
`
`of the present
`
`invention;
`
`FIG.4 is a drawing showing the contents of the
`
`transmission power table provided in a communication
`
`terminal according to Embodiment
`
`l of the present
`
`invention;
`
`FIG.5 is a block diagram showing another
`
`configuration of a base station according to Embodiment
`
`l of the present
`
`invention;
`
`FIG.6 is a block diagram showing the configuration
`
`of a communication terminal according to Embodiment
`
`2
`
`of the present
`
`invention;
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