Title of Invention

A WIRELESS COMMUNICATION APPARATUS AND A METHOD FOR RECEPTION QUALITY REPORTING

Abstract A wireless communication apparatus is capable of increasing data capacity that can be transmitted and reducing power consumption by reducing the amount or control signal to be transmitted , and capable of increasing system capacity by reducing interference with respect to other wireless communication apparatuses. In this apparatus, control information extraction section (105) extracts information indicating the number of CQI"s contained in control information. Reception quality measuring sections (113-1 to 113-n) measure reception quality of each sub-carrier within a communication band. CQI generating section (1H) generates CQX"s for some of the sub-carriers of superior reception quality within the communication band. Multiplexer (122) multiplexes CQI"s, sub-carrier number information generating the CQI"s, and ACK signals or NACK signals. The SC selecting section (127] then selects the number of sub-carriers from a base station apparatus of superior reception quality allocated using the CQI quantity designation information.
Full Text

DESCRIPTION
WIRELESS COMMUNICATION APPARATUS AND WIRELESS
COMMUNICATION METHOD
Technical Field
The present invention relates to a wireless
communication and reception quality reportig method,
and particularly relays to £ wireless, communication
apparatus and reception quality reporting method for
performing high-speed packet communication using
adaptive modulation and scheduling
Background, Art
In a conventional art, m HSDPA (High-Speed Downlink
Packet ACCESS) of 3GPP, adaptive medulationon where the
modulation scheme is adaptively controlled, according -o
propagation path conditions and scheduling nor
transmitting a user signal for which propagation path
conditiong are compaiarable superior have deer employed
in downlink high-speed packet transmission
In multi-carrier transmission such as OFDM and
MC- CDMA ( for example , Kara, Kawabata, Duan and Sekiguchi ,
"MC- CDM System for Packet Communications Using Frequetily
Scheduling11 , TECHNICAL REPORT OF IEICE, RCS2 002-129, July
2002, refer to pp (51-66) being examined as transmission
schemes for beyond 3G mobile communication systems, high
2

speed transmission. is implemented using 3 large number
of sub-camera.
In this kind of transmission scheme, performing
adaptive modulation and scheduling eveiy sub-carrier is
examined
With this kind of adaptive modulation and schsduling
system, it is necessary for the mobile station to g_ve
reporting of channel quality information (CQI (Channel
Quality Indicator) 1 of each sub-earner instantaneously
at a base station.
The mobile station reports individual COl'son eveiy
sub-earner for all sub-catrisrs to the base station
A base station then determines the sub-carrier,
modulation scheme and encoding rate to be used at each
mobile station in accordance with a predetermined
sheduling algorithm taking into consideration the CQl's
from each mobile station
Typically, sub-carrier with comparatively good
propagation path conditions are allocated to each mobile
station, and a modulation scheme and encoding rate
satisfying a predetermined packet error rate are employed
for these propagation conditions
In the event that a base station transmits to a
plurality of mobile stations at the same time, frequency
scheduling is carrifrd out using CQI's of all of the
gub-csrrler from all of the- users.
In other word3, if there are 64 sub-carriers, it
3

is necessary for each mobile statior, to give reporting
of 64 CQI's .
In this event:, whei a CQI is expressed using five
bits, it is necessary to transmit a total of S4 x 5 =
320 bits per one user in each wireless frame
However, with, wireless communication apparatus of
the conventional art, the quantity of signal required
for CQI reporting is enormous This means that interference
incurred by other data channels and other cells is large,
and tne quantity of data that can be transmitted is
therefore substantlally reduced.
Further, as the quantity of signal for giving CQI
reporting is enormous, power consumption of the mobile
station is increased and a battery life is shortened.
Disclosure of Invention
It is an object of the present invention to provide
a wireless communication apparatus and reception quality
reporting method capable of increasing the data capacity
that can be transmitted and reducing power consumption
by reducing the amount of control signal transmitted,
and increasing system capacity by reducing interference
with respect to otner wirelesscommunication apparatuses .
According to art aspect csf the present invention,
a wireless communication apparatus is comprised of a
measuring section that measures reception quality of a
plurality of sub-carriers within a communication bard
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from a received signal every sub-carrier, a selecting
section that selects a sub-carrier satisfying a
predetermined condition relating to measured reception
quality from the plurality of sub-carriers, and a reporting
section. that gives a reporting of a selection result of
the selecting section.
According to a further aspect of the present invention ,
a base station apparatus is comprised of a modulating
section that modulates a packet data using an m-ary number
adapiively selected based on a repotting of a selectjon
result in which ch a sub-carrier satisfying a predetermined
condition relating to reception quality at an opposing
communication apparatus from a plurality of sun-carriers
within a communication band, an encoding section that
encodes the packet data using an encoding rate adaptivt±ly
selected based on the reporting, and a scheduling section
that identifies a sub-carrier satisfying the
predetermined condition based on the reporting and carries
our scheduling so that a packet data of a higher M-ary
number or encoding rats to an ldentifiedsub- carrier having
superior receptisr qualify.
According Co a further aspect of the present invention ,
a reception quality reporting method is comprised of a
measuring step of measuring reception quality of 3.
plurality of sub-carriers within a communication bond
from a received signal every sub-carrier, a. selection
step of selecting a sub- carrier satisfying a predetermined
5

condition relating to measured reception quality from
the plurality of sub-carriers, and a reporting step of
giving a reporting of a selection result of the selecting
aection
Brief Description of Drawings
FIG 1 is 3 black diagram showing a configuration
of a wireless communication apparatus of embodiment. X
of the present invention;
FIG 2 is a clock diagram showing a configuration
of a base station apparatus of Embodiment 1 of the present
invention,
FIG 3 is a diagram showing an arrangement of
sub-carriers on a frequency axis of Embodiment. 1 of the
present invention,
FTG.4 is a diagram showing a signal format of
Embodiment I of the present invention;
FIG S is a diagiarm showing a signal format of
Embodiment 1 of the present invention,
FIG 6 is a block diagram showing a configuration
of a wireless communication apparatus of Embidiment 2
of the present invention;
FIG 7 is a block diagram showing a configuration
of a wireless comniunication apparatus of Embodiment 3
of the present invention,
FIG B is a block diagram showing a configuration
of a hase station apparatus of Embodiment 3 of the present
6

invention,
FIG 9 is a diagram showing a signal format of
Embodiment 3 of the present invention,
FIG 10 is a block diagram showing a configuration
of a wireless communication apparatus of Embodiment 4
of the present invention,
FIG l1 is a block diagram showing a configuration
of a base station apparatus of Embodiment 4 of the present
invention
FIG 12 is a diagram showing a signal format of
Embodiment 4 of the present invention,
FIG.13 is a diagram showing a signal format of
Embodiment 4 of the present invention;
FIG-14 is a block diagram showing a configuration
of a wireless communication apparatus of Embodiment 5
of "he present invention; and
FIG 15 is a block diagram shewing a configuration
of a base station apparatus of Embodiment 5 of the present
invention.
Best Mode for Carrying Out the Invention
The following is a detailed description of
embodiments of the present invention with reference to
the accompanying drawing's.
(Embodiment: 1)
FIG 1 is a block diagram showing a configuration
of wireless communication apparatus 100 of Embodiment
7

1 of the present invention
Reception wireless processing section 102 down
converts a nd such like a received signal received at antenna
101 from a radio frequency to a baseband frequency, and
outputs to guard interval thereinafter referred to as
"GI") removing section 103
GI removing section 103 removes Gl's from a received
signal inputted from reception wireless processing
section 102 and then outputs to East Fourier transform
thereinafter referred to as "FFT, Past Fourier Transform")
section 104
After converting the received signal inputted from
31 removing section 102 from a serial data format to a
parallel data format , FFTsection 104 subject 3 the received
signal to FFT and outputs tocontrol information extracticn
section 105, user data extraction section 106 and pilot
signal extraction section 112,
Control information extraction section 105 extracts
control information contained in CQI quantity information
transmitted from the base station apparatus from tne
received s ignal inputted from FFT section 104 and outputs
to demodulating section 106.
Demodulating section 106 subjects control
information inputted by control information extraction
section 105 to demodulation processing and outputs -c
a decoding section 107
Decoding section 107 decodes demodulated control
8

information inputted by demodulating section 106, outputs
decoded control information, and outputs CQI quantity
information contained in the control information to
sub-carrier selecting section (hereinafter referred to
as "SC selecting section) 137.
User data extraction section 108 extracts user data
from the received signal inputted by FPT section 104 and
outputs to demodulating section 103
Demodulating section 10° subjects userdata inputted
by user data extraction section 108 to demodulation
processing and outputs to reception HARQ (Hybrid
Automation Repeat Request) section 110
If usar data inputted by demodulating section 109
is new data, reception HARQ section 110 saves all or part
of the user data and outputs the user data to a decoding
section 111-
If the user data inputted by demodulating section
109 is re-transmitted data, reception HARQ section 13 0
combines the saved user data which the re-transmitted data ,
saves the combined use data, and outputs the combined
user data to decoding section 111,
Decoding section 111 decodes user data inputted by
reception HARQ section 110 and outputs user data
Further, decoding section 111 performs errsr
detection and decoding, and outputs the result to ACK/NA.CK
generating section 119
The error detection may use CRC (Cyclic Redundancy
9

Checks)
This error detection is not limited to CRC ard
arbitrary error detection methodls may also toe applied
Pilot signal extraction section 112 extracts a pilot
signal from the deceived Signal inputted by PFT section
104 and outputs to reception quality measuring sections
113-1 to 113-n
Reception quality measuring sections 113-1 to 113 -n
are proved for the useable number of sub-carriers
Reception quality measuring sections 113-1 to H3-n
measures reception quality every sub-carrier for all of
the sub- carriers using a pilot signal inputted from pilot
signal extraction section 112, Measurement value
information indicating reception quality every measured
sub-carrriers is outputted to CQI genaration section 114
and SC selecting section 127
Arbitrary measurement values such as CIR (Carrier
to inrerference Ratiol , SIR (Signal to inrerferenceRationl
and suchlike measured every sub-carrier can be used for
the measurement value information
CGI generating section 114 constituting a reception
quality information generating section compares
measurement value information inputted by reception
qualitymeasuring sctiona 113 with a plurality of threahold
values (second threshold values) for CQI selection use
set according to reception quality, far 3 sub-carrier
of a sub-carrier number (hereinafter referred to as "SC
10

number") information chat is identification information
inputted from SC selecting section 127, and selects and
generates a CQI every sub-carrier
In other words, CQI generating section 114 has a
reference table that stores information for CQI selection
use ta which different CQI's are allocated every
predetermined region for measurement values indicating
reception quality separated by threshold values for use
in selection of the plurality of CQI 'a, and selects CQI's
by referring to in formation for CQI selection use entploying
[Reasiurecent value information inputted by a reception
quality measuring section 113,
CQI generating section 114 generates one CQI for
one sub-carrier and therefore generates CQI's for the
designated number of sub-carriers.
CQI generating section 114 outputs the generated
CQI's to an encoding section 115
Generation of a CQI IS not limited to after selection
of a sub-carrier and it is also possible to select a
generated CQI based on CQI quantity information after
generating CQI'a for all of the sub carriers
Encoding section 115 encodes CQl's for the number
of designated sub-carriers inputted by CQI generating
section 114 and outputs to modulating section US
Modulating section 116 modulates CQI's Inputed by
encoding; section 115 and outputs to multiplexer 122
Encoding section 113 encodes SC number information
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inputted by SC selecting section 127 and outputs to
modulating section 113
Modulating section 118 modulates SC number
lnforraation inputted by encoding section 117 and outputs
to multiplexer 122
ACK/NACK generdt ing section 119, according to error
detect ion result information inputted by decoding section
111, generates a NACK signal constituting an error
determination signal it re-transmission is necessary,
generates an ACK signal constituting an error
determination signal in the event that re-transmission
is not necessary, anti outputs the generated NACK. signal
and ACK signal to an encoding section 120
Encoding section 120 encodes s NACK signal or ACK
signal inputted by ACK/NACK generating section 119 and
outputs to modulating section 121.
Modulating section 121 modulates a WACK signal or
ACK signal inputted by encoding section 120 and outputs
to multiplexer 122.
Multiplexed 122 multiplexes CQI's inputted by
modulating section 116, SC number information inputted
Dy modulating section 118, and WACK signals or ACK signals
inputted by modulating section 121 so as to generate
transmission data and outputs the generated transmission
data to a serial/parallel (hereinafter referred to as
"S/P") converter 123
S/P converter 123 converts transmission data.
12

inputted by multiplexer 122 from a serial data format
to a parallel data format and outputs to inverse faat
Fourier transform [hereinafter referred co as "lFFT
Inverse Fast Fourier Transform1') section 124
I FFT sect ion 124 sub] acts transmission data inputted
by s/P converter 123 to inverse fast Fourier transformation
and outputs to GI insertion section 125
GI insertion section 125 inserts Gl's into
transmission data inputted from IFET section 124 and
outputs to transmission wireless processing section 126
Transmission wireless processing section 126
upconverts transmission data inputted from GI insertion
seccion 125 from a baseband frequency to a radio frequency
and transmits from antenna 101
SC selecting section 127 constituting a selecting
section selects a number of sub-carriers designated ny
the CQI quantity information in descending order cf
reception quality using CQI quantity information inputted
by decoding section 10 7 and measurement value information
inputted by reception quality measuring sections 113-1
to 113-n,
SC selecting section 127 then outputs tne selected
sub- tat ners as SC number mEormation to CQI generating
section 114 and encoding section 117
In this way, SC selecting section 127 selects the
number of sub-carriers designated by control station
apparatus
13

Not only in the event that the sub - carried are
selected in descending crder of leception quality, SO
selecring section 127 niay also set a predetermined
threshold value and select a number of arbitrary
sub-carriers designated oy the CQI quantity information
from sub-carrers of reception quality of the threshold
value cr higher
Next, a configuration for & base station apparatus
as a higher-level station apparatus of wireless
communication apparatus 100 is described using FIG,2
FIG 2 IS a block diagram showing a configuration
of base station apparatus 200
Control informal: ion extraction section 205,
demodulating secLion 206, decoding section 207 , encoding
section 209, transmission HARQ section 210, modulating
section 211, encoding section 212 and demodulating section
213 constitute transmission data processing sections
221-1 to 221-n
Transmission data processing sections;22l-l to 221 -n
are provided for the number of users and each of
transmission data processing sections 221-1 to 22l-n
carries out processing on transmission data for
transmission to one user
Further , encoding section 212 and modulating section
213 constitute control data transmission processing
section 220
Reception wireless proceesing section 202 down
14

converts a signal received at antenna 201 from a radio
frequency to a baseband frequency and suchlike and outputs
to GI remova] section 202
GI removal section 203. removes GI from, the received
signal input ted by reception wireless processing section
202 and outputs to FFT section 204
After a received signal inputted by GI removal section
203 is converted from serial data format to parallel data
format FFT section 204 separates the received signal
foreachuser and outputs to respective control In formation
extraction section 205
Control information extraction section 205 then
extracts control information from the received signal
inputted by FFT section 204 and outputs to demodulating
section 205
Demodulating section 206 then demodulates central
information inputted by control information extraction
section 205 ana outputs to decoding section 207
Decoding section 207 decodes the received sigral
inputted by demodulating section 206 and outputs CQI' s
for each of the designated number of sub-carriers included
in the received signal to control section 209.
Further, decoding section 207 decodes the received
signal inputted by demodulating section 206 and outputs
SC number information included in the received signal
to control section 208,
Moreover, decoding section 207 decodes the received
15

signal inputted by demodulating section 206 and outputs
a NACK signal or ACK signal included in the received signal
to tranamission HARQ section 210
Control section 208 as a scheduling section carriers
out sheduling baaed on a sheduling a lgorithm using CQI " s
and SC number information for wireless communication
apparatus 100 of each user inputted by decoding section
307, and; adaptively selects MCS (Modulation Coditig
Schemes 1 for the M-ary numbers and encoding rates and
suchlike
In other words, control section 208 is capable of
determining reception quality every sub-carrier of each
wireless communication apparatus 100 using t~~- CQT s ; id
SC number information for each sub-carrier transmitted
from the wireless communication apparatus 100 for each
user The MCS is then selected according to reception
quality for each sub-carrier of each wireless
communication apparatus 100
Control section 208 has knowledge of the number of
sub-carriers, and it impossible toal locate transmission
data co be sent to each wireless communication apparatus
100, to each sub-carrier within the range of usable
eub-carriers
At this time, control section 208 carries out the
allocation, determining reception quality zoi.
sub-carriers for which CQI's have nor been transmitted
by Wireless communication apparatus 100 as being the
16

poorest.
Control section 208 outputs encoding rate
information selected for each sub-carrier no encoding
section 209 and. outputs modulation scheme information
selected for sach sub-carrier to modulating section 211,
and alao outputs information on sub-carriers allocated
to each wireless communication apparatus 100 using
scheduling to sub-carrier allocation section 215.
Encoding section 209 encodes inputted transmission
data based on encoding rate information inputted by control
section 206, and outputs to transmission HARQ section
210 .
Transmission HARQ section 210 oucputs transmission
data-inputted by encoding section 209 to modulating section
211 and temporarily holds transmission data outputted
to modulating section 211
In the event that an NACK signal is inputted by
decoding section 207, a re-transmission is requested by
wireless communication apparatus 100, and therefore
transmission HARQ section 210 outputs temporarily held
transmission data for which output is complete to
modulating section 211 again.
On the oLher hand, in the event that an ACK signal
is inputted oy demodulating section 207, transmission
HARQ section 210 outputs new transmission data to
modulating section 211,
Modulating section 211 modulates transmission data
17

inputted by transmission HARQ section 210 based 01
modulation scheme information inputted by control section
208 and outputs to multiplexer 214
Encoding section 7, L2 then encodes control data and
CQI quantity information inputted by a control station
apparatus (not shown) as a higher-level station apparatus
of base station apparatus 200, and outputs tc modulating
section 213,
The CQI quantity information 13 not limited Co being
inputted by the control station apparatus and may also
bs: set, by base station apparatus 200 .
Further, the CQI quantity information can also be
set taking into consideration number of users and volume
of traffic
Moreover, this may be set as a value corresponding
to reception capability of every mobile station
Modulating section 213 modulates control data and
CQI quantity information inputted by encoding section
212 and outputs to multiplexer 214
multiplexer 2L4 multiplexes transmission data.
inputted by modulating section 211 and control data and
CQI quantity information inputted by modulating section
213 for data to be transmitted Co wireless transmission
apparatus 100 of each user and outputs to sub-earner
allocation section 215
CQI quantity information, is information specific
to the wireless communication apparatus 100 of each user
18

Sub-carrier allocation section 215 rearranged
multiplexed signals inputted by multiplexer 214 based
on sub-carrier information for each wireless
communication apparatus 100 inputted by control section
208 and outputs to S/P converter 315
S/F converter 216 converts transmission daca
input ted by sub-carrier allocation section 215 from send
data tarmat to parallel data format and outputs to IFFT
IFFT section 217 subjects transmission data inputted
cy S/P converter 216 to IFFT and outputs to Gl insertion
section 218.
Transmission data transmitted to each of wireless
communication apparatus IOC subjected to IPFT at IFFT
section 217 is then allocated to frequency-scheduled
sub-carners at control section 208
Gl insertion section 218 inserts GI's into
transmission data inputted from IFFT section 217 and
outputs to a transmission wireless processing section
215
Transmission wireless processing section 219 up
converts etc transmission data inputted from GI insertion
section 216 from a baseband frequency to a. radio frequency
and transmits from antenna 201
next, a description is given of a method for selecting
sub- carriers at wireless communication apparatus 100 and
format for transmission signals during transmission of
19

the CQI's ot the selected sub-carriers using FlGs.3 to
FIG 5
FIG 1 is a diagram showing sixty-four sub-earners
allocated withn a range of a predetermined communication
bandwidth pi.
Base station apparatus 200 sends high-speed packet
data to the viiteleas communication appaiatus 100 of all
the users using the sub-carriers 1 to 64
In the event that the reception quality of
sub-carriers ll to 21 and sub-carriers 34 to 11 is good
from the reception quality measurement results ez.
reception quality measuring sections 113-1 to 113 n, sC
selecting section 127 selects sub-carriers 11 to 21 and
sub-Carriers 34 to 41
CQI generating section 114 generates CQI h 3 for only
sub-camera 11 to 21 and sub-carriers 14 to 41, and
generates SC number information for sub-carriers 11 to
21 and sub-carriers 34 to 41
On the other hand, CQI generating section 114 does
not generate CQI's and SC number information for
sub-carriers other than sub-carrier 11 to 21 and
sub-carrier 3 4 to 4 1
FIG,4 is a diagram showing a format for a signal
transmitted from wireless communication apparatus 100
to base station apparatus 200-
Items of gut-bit SC number information and five-bir
OQI's are then paired together to constituent one item
20

of sub-carrier control information-
As shown in FIG.4, control information outputted
by multiplexer 122 is a signal resulting from
time-division-multiplexing of a pair of conticl
information items for each sub-carrier for which CQI's
are generated at CQI generating section 114 and & one-bit
ACK/NACK signal
FIG-5 is a diagram showing a further example of a
format: for a signal transmission from wireless
communication apparatus 100 to base station apparatus
200-
One item of sub-carrier control information is
constiiuted by one bit of SC number information and five
bits of CQI.
Aa shown in FIG.5, control information output ted
by multiplexer 122 is a signal resulting from
time-dvision-multiplexing of SC number information of
61 Fits from the top for 64 sub-carriers , CQI 's for only
the sub-carriers for which CQI's are generated at CQI
generating section 114, and one bit of ACK/NACK signal
The SC number information is information
time-division-multiplsxed m order from the firar
sub-carrier of the 64 sub-carriers, with SC numbet
information for sub- earners f or which CQI's are generated
being indicated as " 1"; and SC number information fcr
sub-carriers for which CQI's are not generated as hJ"
As a result, bit 1, bits 2 to 10, bits 22 to 33 and
21

bits 42 to 64 are indicated aa lhD", and bits 11 to 21
and hits 34 to 41 are indicated as "1".
At base station apparatus 200 receiving the CQl's
and SC number information, control section 208 carriers
out scheduling of each sub-carrier for each wireless
communication apparatus 100 by prioritizing allocation
of sub-carriers 11 to 31 and sub-carrieis .3 4 to 41
Furthet, u can slso be considered to [nap data (for
example , control data of high importance or playback data
etc. ,' for which it is necessary to make the number of
errors small with respect to the sub-carriers.
According to this Embodiment 1, a number of
sub-carriers for which reception quality is good
designated by & base station apparatus are selecteS and
CQI's are generated and transmitted for the selected
sub-carriers, Therefore, it is possible to increase the
data capacity that can be transmitted and reouce power
Consumption by reducing the signal volume transmitted
through, the uplink and also possible to increase system
capacity by reduc_-^g lntsiftfence with respect to ether
wireless commnication Apparatuses.
Also, according to Embodiment 1, CQl'ss-are generated
only for selected sub-carriers and processing time -whole
generating CQI ' s can therefore be made sort Further,
according to this embodiment, designation upon selecting
aub- carriers for which CQI 'sare generated may be achieved
simply by transmitting designation information
22

designating the quantity of CQl's from the base station
apparatus. It ia therefore possible to reduce the amount
o£ signal transmitted through the uplink wicl out
increasing the amount ot signal transmitted tnrough 1 he
downlink,
(Embodiment 2)
FIG,6 is a block diagram showing a communication
for a wireless communication apparatus 500 according to
Embodiment 2 of the present invention.
As shown in FIG 6, wireless communication apparatus
500 according to Embodiment 2 is of a configuration where
sc selecting section 127 is omitted and a threshold value
determining section 601 is added in wireless communication
apparetus 100 of Embodiment 1 shown in FIG 1
In FIG 6, portions with the same configuration as
for FIG 1 are given the same numerals and are n<. i describ-> Further, the configuration of the cast allocation
apparatus with the exception of sending CQI threshold
value information instead of CQI quantity information
is the same as the configuration of FIG 2 and is therefore
not described.
Decoding section 107 decodes de-modulated control
information inputted by demodulating section 106 and
outputs control information, and outputs CQl threshold
value information contained in the control information
to a threshold value determining section 601 >
23

CQI generating section 114 generates CQI ' s for each
sub' carrier for all of the sub-carriers ugmct measurement
value information inputted by reception quality measuring
section 113
In other words, CQI generating section 114 has a
reference cable that scares information for CQT selection
use to which different CQI ' s are allocated every
predetermined region for meaaurement values indicating
reception quality separated by threshold values for use
in selection. of the plurality of CQl's, and selects CQI ' s
by refei ring to information for CQI selection use employing
measurement value information inputted by reception
quality measuring section 113.
CQI generating section 114 outputs the generated
CQI'3 to threshold valae determining section 601.
CQI generating section 114 is, not limited to the
case of generating CQI ' s tar: all sub-carriers, and CQI s
may be generated after sub-carriers are selected by
determining threshold valutes far reception quality for
each sub-carrier.
Threshold value determining section 601 as a
selecting section selects only CQl's for whicn the
reception quality is greater than or equal to a threshold
value using CQl's, which are inputted by CQI generating
section 114, and CQI threshold value information, which
is a first threshold value inputted by decoding section
107, outputs the selected CQI is to encoding section 115,
24

and outputs SC number information for the selected CQi' s
to encoding section 117
Specifically, in the case of using CQI for eight
levels of level 1 to 9, only CQI ' s of level 5 or greater
are selected when a threshold value is level 5 or more,
and only CQl's of level 4 or greater are selected when
a threshold value is level 4 or more,-
Threshold value determining section 601 is capable
of adopting a method of outputting information for eight
levels indicating which level of eight levels, level 1
ro level 8 , a selected CQI is at, or a method of cutputting
information of a relative value where, in the event that
for example, a threshold value is level 5 or more and
a generated CQI is level 7, a value 2 that is a relative
value with respect to the threshold value is outputted.
In the case of adopting the method of outputting
information for eight levels, three hits are required
in Order to empress levels 1 to 8. In the case of adopting
a method of outputtmg relative value information, if
a difference in threshold value is Q to 3, then only two
bits of in format ion a re sufficient The amount of signals
transmitted can therefore be reduced in the case of
transmitting relative value information
In the case of adopting the method of outputting
relative value information, the base station stores
threshold value information which is m common with
wireless communication apparatus 600
25

The method for selecting CQI's at wireless
cammunication apparatus 600 and format for transmitting
signals during transmission of the selected {ji's IE tie
same as for PIG 3 to FIG.5 and is therefore ,1 : - ii---s HD-"
According to Embodiment 3, the press- : . nvft . \i
selects sub-carriers satisfying reception quality of a
threshold value or more designated by the bast station
apparatus and generates and transmits CQI's for the
selected sub-carriers, By reducing the signal volume
transmitted through the up1ink, it is possible to increase
the data capacity that can be transmitted and reduce power
consumption, and, by reducing interference with respect
to other wireless communication apparacuses, it is
possible to increase system capacity -
Further, according to Embodiment 1, designstion upon
selecting sub- carriers for which CQI' 5 are generated may
Be achieved simply by transmitting designation
infarraation designating a threshold value from the case
station apparatus It is therefore possible to reduce
the amount of signal transmitted through the uplink wi thout
increasing the amount of signal transmitted through the
downlink.
(Embodiment 3J
FIG 7 is a block, diagram showing a configuration
of a wireless communication apparatus 700 according to
Embodiment 3 of the present invention.
26

As shown in FIG, 7 , wireless communication apparatus
700 of Embodiment 3 is of a configuration where encoding
section. 117, demodulating section 118, and SC selecting
section 127 are removed, and threshold value determining
seer .on "7 til, used sub-carrier selecting section 702 and
spreading section 703 are added in wire less communication
apparatus ±00 of Embodiment l shown in FIG 1
In FlG,7r portions with the same configuration as
for FIG lare given the same numerals and are not described -
CQI generating section 114 generates CQl's for each
sub-carrier for all of the sub-carriers using mreasurement
value information inputted by reception quality measuring
section 113,
in other words, CQI generating section 114 has a
reference table that stores information for COX selection
use to which different CQI's are allocated every
predetermined region for measurement values indicating
reception quality separated by threshold values for use
in selection of the plurality of CQI's , and selects CQI ' s
by referring to information for CQI selection use employing
measurement value information inputted by reception
quality measuring section 113.
CQI generating section 114 outputs the generated
CQI's to threshold value determining section 701-
The CQI generating section is not limited to the
case of generating CQI'S for all sub- garners, and CQI ' 3
may be generated after sub-carriers are selected by
27

determining threshold values for reception quality for
each sub-carrier.
Threshold value determining section 701 as a
selecting section selects only CQI's for which t.ie
reception quality is greater than, or equal to a threshold
value using CQI's, which are inputted by CQI generating
section 114, and CQI threshold value information, which
is inputted by decoding section 107, outputs the selected
CQI's to encoding section its, and outputs SC number
information for the selected CQI'e to used sub-carrier
selecting section 702.
As with the threshold value determining section 501
of Embodiment 2, thresnold determining section 701 .s
capable of threshold value determination adopting eitner
of a method of outputting information. for eight levels
indicating which of the eight levels, levels 1 to 8, tne
selected CQI ' s are at or a method of outputting relative
value information.
Used sub-carrier selecting secticn 702 selects
sub- carriers , for which CQ'I ' s are generated using SC number
information inputted by threshold value determining
section 701, or sub-carriers, which have in advance a
one-to-one correspondence -with such sub-car tiers, as
transmission 3 ub -carriers, and outputs CQI ' s to spreading
section 703
Spreading section 703 subsets each CQI inputted
by used gub-cairier selecting section 702 to spreading
28

processing using CQI spreading code,allocates CQl signsiB
to sub-carriers allocated by used sub-carrier selecting
section 702 and. outputs to multiplexer 122
The CQI spreading code is a spreading code that
differs every wireless communication apparatus 700 of
each user and the same spreading code is used for the
sub-carriers and CQI's of all of wireless communication
apparatus 700 of each user.
The SC number information is not subjected to
spreading processing by spreading section 703 because
SC number information is not transmittea.
Multiplexer 123 multiplexes CQI's inputted c-y
spreading section 703 and NACK signals or ACK signals
input red by modulating section 121 and outputs to S/P
converter 123
The multiplexed signal multiplexed at multiplexer
122 comes into a state where CQI of each sub-carrier is
allocated to the sub-carrier itself, qr where CQI1 of
each sub-carrier is allocated to a sub-earner which has
one to one correspondence with each sub- carrier
The details of the method for allocating sub-carriers
will be described later.
Next, a description is given using FIG 3 of a
configuaration for a base station Apparatus of Embodiment
3 .
FIG.S is a block diagram showing a configuration
of a base station apparatus 800,
29

As shown in FIG.9, a base station apparatus 800
according to Embodiment 3 is of a configuration -where
de-spreading section 801 and sub-carrier determining
sect, ion B02 are added in base station apparatus 200 of
embodiment 1 shown in FIG.2,
In FIG.B, portions with the same configaration as
for FIG.2 are given the same numerals and are not described
Transmission data processing sections 803-1 to 603 -n
are comprised of control information extraction section
205, demodulating section 206, decoding section 207,
encoding section 209, transmission HARQ section 210,
modulating section 211, encoding section 212,
demodulating section 213, de-spreading section 301 and
sub-carrier determining section 802
Transmission data processing sections803 1 to 803-n
are provided for the number of users and each of
transmission data processing sections 803-1 to 803-n
carries out processing on transmission data for
transmission to one user
De-spreading section 801 stores a plurality of
spreading codes used at wireless communication apparatus
700 of one user with which base station apparatus 800
is carrying out communication
De-spreading section 801 then subjects all of the
sub-carriers inputted by control information extraction
section 205 to de-spreading processing using the stoiei
de-epreadmg code and outputs this to. sub-carrier
30

determining section 802.
Different spreading codes are stored at each of the
de-spreading sections 801 of each of the transmission
dataprocessingsectiens 803-l to 803-nbecausea different
spreading code is used at each wireless communication
apparatus 700
Sub-carrier determining section 802 determines a
sub-carrier, of which de -spreading output inputted -by
de-spreading section 801 is greater than or equal to a
threshold value, to be a sub-carrier selected at wireless
communication apparatus 700, and outputs 'SC number
information of a sub-carrier with reception quality uf
greater than or equal to the threshold value to control
section 208 and demodulating section 206.
Because SC number information is not transmitted
by wireless communication apparatus 700 r sub-carrier
determining section S02 stores in advance SC number
information that is in common to wireless communication
apparatus 7D0
Further, the reception quality is taken to be a
relative value with respect to the pilot signal taking
into consideration fluctuation in reception quality due
to fading
Decoding section 207 decodes the received signal
inputced by demodulating section 206 and outputs CQ1's
for each of the designated number of sub-carriers included
in the received signal to control section 208.
31

Moreover , decoding section 207 decodes the received
signal inputted by demodulating section 2GS avid outpais
a NACK signal or ACK signal included in the received signal
Co transmission HARQ section 310
Control section 208 carries out scheduling based
on CGI 's of wireless communication apparatus 700 for each
user inputted by decoding section 207 and SC number
information for wireless communication apparatus 700 of
each user inputted by sub-carrier determining section
802, and MCS including M-ary number and encoding rates
etc. are adaptively selected-
In other words, contral section 208 is capable "if
determining reception quality every sub-carrier for each
wireless communication apparatus 700 using CQI's for each
sub-carrier sent by wireless communication apparatus 70O
of each, user and SC number information for wireless
communication apparatus 700 of each user inputted by
sub-carrierdetermining section 802 MCS is then selected
according to reception quality Of each sub-carrier for
each wire leas communication apparatus 700
Control section 2QS is capable of allocating data
to be transmitted to each wireless communication apparatus
700 to sub-carriers of good reception quality at each
wireless communication apparatus 700
Control section 208 has knowledge of the number of
usable sub- carriers and al locates transmission data sent
to each wireless communication apparatus 10& within the
32

range of usable sub-carriers to each sut-carrier.
At this time, control sect_on 2GB carries out
allocation; determining isception quality of a
aub-carrier for which CQI's has not been transmitted by
wireless communication apparatus 700 asbaitig the poorest.
Control section 208 outputs encoding race
information selected for each sub-carrier to encoding
section 209, outputs modulation scheme information
selected for each sub-carrier to modulating section 211
and outputs sub-carrier information allocated to each
wireless communication apparatus 700 using scheduling
to a sub-carrier allocation section 215
Next, a description is given using FIG 3 and TIG 9
of a method for selecting CQI's occurring at wireless
communication apparatus 700 for allocation to
sub-carriers, and s format for a transmission signal when
transmitting selected CQI's
It is possible to adopt two methods, a method where
CQI' of each sub-carrier is allocated to the sub- carrier
itself, or a method where CQI1 of each sub- carrier is
allocated to another sub-carrier with a one-to-one
correspondence , as methods far allocating sub-carriers
First, a description is given of a method fur
allocating CQI ' s of each sub-carrier to the sub-carrier
itself
In FIG. 3, in the event that the reception quality
of sub- carrier 11 to 21 and sub- carrier 34 to 41 •- s
33

good from reception quality messsurement results at the
reception quality measuring sections 113-1 to 113-n,
threshold value determining-section 701 selects the CQI ' s
of sub-carriers II to 21 and sub- carrier 34 to 4 1, used
sub-carrier selecting section 702 allocates CQI ' a for
sub- carrier 11 to 21 to sub- carrier 11 to 21, and the
CQI's for sub- carriers 14 to 41 are allocated to the
sub-carriers 34 to 41
On the other hand, threshold value determining
section 701 does not select CQI ' a and SCnumber information
for sub-carriers other than sub-carrier 11 to 21 and
sub- carrier 34 to 41,
Next, a description is given of a method fcir
allocating CQI of each sub- carrier to another sub- carrier
with, a one-to-one correspondence
In FIG. 3, in the event that the reception quality
of sub-carriers 1l to 21 and sub-carriers 34 to 41 is
good from reception qualify measurement results at
reception quality measuring sections 113-1 to 113 - :threshold value determning section 701 selects the CQI ' s
of sub-carriers LI to 21 and sub-carriers 34 to 41, used
sub-carrier selecting section 702 allocates CQI's fcr
sub-carriers 11 to 21 to sub-carriers 22 to 32 each havig
a one-to-one correspondence, and the CQl'sof sub-carriers
34 to 41 are allocated to the sub-carriers 51 :o 57 each
having a one-to-one correspondence
On the other hand, threshold value determining
34

section 701 does not select CQI ' s and SC number information
for sub-carriers cither tnan sub-carrier 11 : to 21 and
sub-carriers 34 to 41
By scoring sub-carriers having one-on-one
correspocdence with sub-carriers far which CQI ' s are
genarated at wireless communication apparatus 700 and
base station apparatus 800 in advance, bass station
apparatus 800 can recognize which sub-carrier a received
CQI is far.
FIG 9 is a diagram snowing a format for a signal
transmitted from wireless communication apparatus 700
to base station apparatus 800.
As shown in FIG 9, control information constituted
of CQI ' s each having five bits and. ACK signals or IvACK.
signals far sub-carriers selected by a threshold value
determanatior" at threshold value determining section 701
is time division multiplexed and transmitted
According to Embodiment 3, sub-carriers satisfying
reception quality of 3L threshold value or more designated
by the base station apparatus are selected and CQ11 B a.re
generated and transmitted for the selected sub-earners.
By reducing the signal volume transmitted through the
uplink;, it is possible to increase the data capacity that
car. be Crausmitted and reduce power consumption and by
reducing interference with respect to other wireless
communecation apparatuses, it is possible Co increase
system capacity.
35

Moreover, according to Embodiment 3, CQI ' s ,are
allocated to selected sub-carriers with good reception
quality and base station apparatus 800 is therefore rapable
of acquiring good quality CQI's.
Further, according to Embodiment 3, CQI generated
foreach sub-carrier is allocated to the sub-carrier itself.
Base station apparatus 800 can therefore determine which
sub-carrier CQI is for even without transmitting SC number
information and the volume of signal trasmitted can
therefore be reduced by the amount resulting from not
sending the SC number information ,
Still further, in the event that the duplex scheme
is TDD , the propagation path charecteristics of the uplink
and the downlink are substantially the same. It is
there fore possible to use sub- carriers with good reception
quality for che downlink as those for che uplink also
In other words, it is possible to transmit a CQI
signal using a supsnor propagation path-
Futther, according to Embodiments 3, designation upon
selecting sub-carriers for which CQI ' s are generates rray
be achieved simply by transmitting desigiiat ion
information. designating a threshold value from the base
station apparatus It is therefore possible to reduce
the amount of signal tranamiitted through, the uplinK without
increasing the amount of signal transmitted through the
downlink
According to Embadiment 3 , the sub-carriers CQT ' 3
36

are subjected to spreading processing using a spreading
code specific to wireless conmutiicaticn apparatus 700
of each user In the event that CQI's are transwitted
for the same sub-carrier by the wireless cammunication
apparatus 700 of a plurality of users, it is possible
for base station apparatus 800 to discriminate rfhlch
tireless communication apparatus TOO of which user a CQJ
has been sent from
(Embodiment 4;
FIG.10 is a block diagram showing a configuration
far a wireless communication apparatus 1000 according
to Embodiment 4 of the present invention
As shown in FIG 1Q, wireless communication apparatus
1000 of the fourth embodiment is of a configuration where
CQI generating section 114, encoding section 115 and
modulating section. 116 are excluded in Che wireless
communication apparatus 100 of Embodiment 1 shown in FIG 1
In PIG 10, portions with the same configuration as
for PIG .lars given the aatne numerals and ate not described.
SC selecting section 127 selects a number of
sub-carriers designated by the CQI quantity information
in order of good reception quality using CQI quantify
information inputted by decoding section 10' = >d
measurement value information inputted by the lecepti 11
quality measuring sections 113-1 to 113-n.
SC selecting section 127 then outputs the selected
57

sub-carriers as SC number information to encoding aectiou
117.
Multiplexer 122 multiplexes SC number information
inputted by the modulating section lie, and WACK signals
or ACK signals inputted fay modulating section 121 so as
to generate transmission data, and outputs the generated
traraitiission data to S/e converter 123
Next, a description is given using FIG.11 at a
configuration for a case station apparatus 1100 of
Embodiment 4
FIG-11 is a clock diagram showing 3 configuration
for base stauon appaiatus HOC
In FIG,11, portions with the same configuration as
for PIG 2 are given the same numerals and are not described
Decoding section £07 decades the received Signal
inputted by demodulating sections 206 ancl out put a SC number
information included in the received signal to control
secrcion 208
Moreover, decoding section 207 decodes the received
signal inputted oy demodulating section 2C6 and outputs
a MACK signal or ACK signal included in. the received signal
to transmission HARQ section 210
Control section 208 LS Able to be aware of
sub-cariiars of good reception quality at wireless
communication apparatus 1000 of each "User from SC number
information for wireless communication apparatus 10D0
ot each user inputted by decoding section 207 Scheduling
58

is therefore carried out based on A scheduling algorithm
in such a manner that transmission data is allocated to
sub-carriers of SC numbers with good reception quality
In otlier words, control section 208 carries out
scheduling in. such a Riatmer that transmission data is
allocated m order from the top of the SC number because
3C number la arranged in descending order of reception
quality of sub-earners
Control section 208 outputs sub- carrier information
for use in transmission to sub-carrier allocation section
Encoding section 209 encodes transmission data at
a fixed encoding rate set in advance and outputs to
transmission HARD section 210
Modulating Section all modulates transmission data
inputted by transmisaion HARQ section 210 using- a fixed
modulationmethodset in advance and output 3 to multiplexer
214
Next, a description is given of a method for selecting
CQX ' s an wireless a communication apparatus 1000 and format.
for transmission signals during transmission of the
selected CQl's, using FIG.3 and FIG 12.
In FIG.3, in the event that the reception quality
of sub-csrnera 11 to 21 and sub-carriers 34 to 41 is
good from the reception quality measurement reaults at
reception quality measuring sections 113-1 to 113-n, EC
selecting section 127 outputs SC number information only
39

for. sub-carriers 1l to 21 and sub-carriers 34 to 41
on the other hand, SC selecting section. 127. does
not output CQl ' s and SCTnumber information for sub-carriers
other than sub-carrier 11 to 21 and sub-carriers 34 to
FIG 12 iS a diagram showing a format for a signal
transmitted Iron wireless communication apparatus 1000
to "base station apparatus l100.
AS shown in FIG 12, control information output ted
by muitiplexsr 122 is a signal of
time-division-multiplexing of SC number information
comprised of six bits for sub-carriers selected at so
selecting section 127 ana a one-bit ACK/NACK signal-
FIG 13 is a diagram showing a further example of
a format for a signal transmitted from wrireless
communication apparatus 1000 to base station apparatus
1100
As shown in FIG 13, control information outputted
by multiplexer 122 is signal of
time - division-multiplexing of EC number information of
64-bits from the top for each of the 64 sub-carriers and
a one-bit ACK/WACK signal
The SC number information is information
time-division-multiplexed m order from the first
sub-carrier of the 64 sub-carriers, with SC number
information for sub-carriers that are selected being
indicated as " l", and SC number information for
40

sub- carriers that are not selected being indicated as
"0"
Therefore, bit 1, bits 3 to 10, bits 22 to 33 and
bits '12 to 64 we indicated aa "0", and bits 11 to 21
and bits 34 to 41 are indicated as "1"
According to Embodiment 4, a number of sub-carriers
designated by a base station apparatus as having good
reception quality are selecced and SC number information
is sent to the selected sub-carriers. The volume of signal
transmited thrnug'! the uplink can theceiore be reduced
compared to tne case 'where CQI ' a and SC number information
are both transmitted. It is therefore pcasible ro
increase the data capacity that can be transmitted and
reduce power consumption., and increase system cspaciLy
by reducing interference with respect to other wireless
communication apparatuses
Further" according to Embodiment 4 , designation upon
selecting sub-carriers for which CQI' s are generated may
be achieved simply by transmitting designation
in format ion designating the number of CQI1 s from the base
station apparatus It is therefore possible to reduce
the auto Lint of s ignal transmitted through, the uplink without
increasing the amount ot signal transmitted through the
downlink,
Moreover, according to Embodiment 4 , a base station
apparatus is capable of carrying out encoding using
encoding races fixedly set in advance, modulation and
41

sucnlike It 10 then possible to make circuits and apparatus
smaller and reduce manifacturing costs by s 3 simplifyingf
processing for encoding processing and modulation
processing and so on.
(Embodiment 5)
FIG 14 is a "block diagram showing a configuration
for a wireless communication apparatus 1400 according
to Embodiment 5 of the present invention
As shown in FIG 14, wireless commumcation apparatus
1400 of Embodiment 5 is of a configuration where encodng
section 115, modulating section 115, encoding section
117, demodulating section 138, and SC selecting section
127 are removed, and threshold value determining section
1401, CQI spreading code generating section 1402, used
sub-carriers selecting section 1403 and spreading sectun
1404 are added in wireless communication apparatus 100
of embodiment 1 shown in FIG, I
In FIG 1*, portions with the same configuration as
for FIG , 1 are given the same numerals and are not described
Threshold value determining section 1401 as a
selecting eec't-an selects only CQl's with reception
quality greater than or equal to the threshold value using
CQI ' s. 'which are eeception quality information for"
selection use and inputted by CQI generating section 114,
and CQI threshold, value information, which is inputted
by decoding section 107, outputs the selected CQIrs to
42

theCQI spreading code generating section 1402 , and outputs
SC "number information for selected CQl's to the used
sub-carrier selecting section 1403,
As with the threshold value determining section 601
of Embodiment 2, threshold determining section 1401 is
Capable of threshold value determination adopting either
of a, method ot outputting eight levels of information
indicating which of the eight levels, levels 1 to 8, the
selected CQI' s are at or a method of outptrtting relative
value information
This is not limited to selecting CQI'a greater than
or aqual to a, threshold value from CQ I 's for all of ths
sub-carriers, and it is also possible to select
sub-carriers with reception quality greater than or equal
to a threshold value before generating CQl's and only
generating CQT's of the selected sub-carriers.
CQI spredding code generating section 14 0Z
constituting a spreading code selection section has a
referenuetable that stores CQI spreading code information
which is spreading code selection information for
providing a relationship between associating CQI's and
spreading codes
CCT spreading code generating section 1405 selects
spreading codes by referring to CQI spreading code
information using CQl's input-ted by a threshold value
determining section. 1401 and outputs selected spreading
code information to spreading sector 1404-
43

Spreading codes in the. CQI spreading code information
are codes that are different at wireless communication
apparatus 14D00 of each user and are codes that are different
for each CQI.
Used sub-carrier swlecting section 1403 a1locates
an ACK signal or KACK signal as an error determination
signal inputted by modulating section. 121 to a sub-carrier
selected using SC number information input ted by threshold
value determining section 1401 and outputs to spreading
section 1404 ,
Intne event that a plurality of SC number information
are inputted from threshold value determining eecttoa
1401, Msed sub-carriers selecting section 1403 allocates
ACK signals or WACK signal s to a plurality of sub-carriers
reporteo using the SC number information
sprading section 1404 subjects sub-carriers
allocated with ACK signals or WACK signals inputted by
used sub-carrier selecting section 1403 to spreading
processing using spreading codes inputted by the CQI
spieading code generating section 1402 and outputs. to
multiplexer 122.
Next, a description is given using FIG.15 of a
configuration for a case station apparatus of Embodiment
5.
FIG 15 is a block diagram showing a configuration
for base station apparatus 1500.
As shown in FIG.15, best station apparatus 1600 of
44

Embodiment is of a configuration where a de-spreading
section 1501 and a determining section 1502 are added
in base station apparatus 200 of Embodiment I shown in
FIG,2.
In FIG IS, portions with the Sadie cronfiguration- as
for PIG 2 are given the same numerals and are not described.
Transmission data processing section 1503-1 to
1503-n are comprised of control information extractorn
seccion 205, demodulating section 206 decoding section
307, encoding section 209 , transmission HARQ section 210 ,
modulating section 311, encoding section 212,
demodulating section. 213, de-spreading section 1501 and
determining section 1503,
Transmission data. processing sections 1503-L to
1503-n are provided for the number of userS And each of
the transmission data processing sections 1503-1 to 1503-n
carries out processing on transmission data Eor
transmission to one user
De-spreadig section 1501 Stores in. advance a
plurality of spreading codes used at wireless
communication apparatus 1400 of one user with which base
station apparatus 1500 is carrying out communication
De - spreading section 1501 then subjects all of the.
sub-carriers inputted by control information extraction
section 205 to de-spraading processing using the stored
de-spreding code and output a to determining section 1502
De-soreading sections 1501 of each of transmission
45

data proceasing sections 1503-l to l503-nstoresain advance
a diiferent spreading code because a different spreading
code ;s used at each wireless communication apparatus
1400.
Determining section 150 2 has a reference table that
Stores CQI spreading code information for providing a
relationship between the spreading code and CQl's, and
stores spreading codes used by Wireless communication
apparatus l400 of one user
Determining sections 1502 of each of transmission
data processing sections 1503-1 to 1503-nstores in advance
a different spreding code because a diffferent spreading
code 13 used ac each wireless communication apparatus
1400
CQI spreading code information is in common with
CQI spreading code generacing section 14 02
determining section 1502 obtains a de-spreading
output for received signals inputted by de- spreading
section 1501 every sub-carrier, and compares tne largest
de-spreading output with a threshold value (a third
threshold value) every sub-carrier
Determining Section 1502 determines sub-carriers
whose largest de-spreading outputs are greacer than or
equal to the threshold value are sub-carriers selected
by wireless communication apparatus 14DQ, s£lects CQI ' s
of sub-carriers whose largest de-spreading outputs are
greater than ox equal to the threshold value by returning
46

to CQI eprsaditag code information using spreading codes
employed in de spreading of the largest de-spreading
outputs, and outputs the selected CQI's to control section
203.
At this tiirte, the de-spreading output is expressed
as a relative value with respect to the received signal
power of a pilot, taking into concideration fluctuation
in received signal power due to fading.
Demodulating section 206 then de-modulates an ACK
signal or NACK signal inputted by the determining section
1502 anti outputs tc decoding sectior. 207
Decoding section 207 then outputs the results of
demodulating the ACK signal or NACK signal inputted ay
demodulating section 206 to traneinissiori HARQ section
Control section 208 carries out scheduling based
on a scheduling algorithm using CQI's for wireless
communication apparatus 1400 of each user inputted by
determining section 1502, and adaptively selects MCS's
for the M-ary numbers, encoding rates and suchlike
In other words, control section 208 is capable of
determirLing reception quality every sub-carrier for each
wireless communication apparatus 1400 using CQI's every
sub- carrier inputtedby determining section 1502 WCS ' s
are then selected according to reception quality of eacn
sub-carrier for each, wireless communication apparatus
1400-
47

Control section 208 has knowledge of the number of
sub-carriers and it is possible to use and allocated
transmission data to be sent to each wireless communication
apparatus 1400 within the range of usable aub-carriers
to eacn sub-carrier
At this time control section 208 carries out
allocation, determining reception quality of. a
sub-carrier for which CQT's has not been inputte-d by
determining section 1502 as being the poorest
Control sectiori 206 outputs encoding tate
lnformction selected for each sub-carriers to encoding
section 209, outputs modulation scheme information
selected far each sub-carriers to modulating section 211
and outputs sub-carrier information allocated to each
Wireless communication, apparatus 1400 using scheduling
to sub-carrier allocation section 215-
Nextr a description is given using PIG. 3 of a method
for selecting sub-earners at wireless communication
apparetus 1400.
Usea sub carrier selecting section 1403 allocates
ACK signals or HACK signals to sub-carriers XI to 21 and
sub-carriers 34 to 41.
Control information multiplexed at multiplexer 122
is a signal resulting from time-division-multiplexirtg
of a plurality of ACK signals or MACK signals
In the case of FIG 2, a, plurality of ACK signals
or WACK signals are transmitted but as the ACK signals
48

or WACK signals ats one bit whereas the five bits are
require-J For CQI's, the overall quantity of signal can
be reduce
According to embodiment 5, a sub-carriers of good
reception quality is selected, and an ACK signal or NACK
signal s allocated to the selected sub-carrier - by
r-aucer the amount of signal transmitted on Dje upllr.K,
it is possible to increase the data capacity that can
be transmitted that can be transmitted and teduce poviei
conscript. on, and, by reducing interference with respect
to otfrer wireless communication apparatuses, it is
possible too increase system capacity.
According Co Embodiment 5, dual purpose use of the
ACK signal or NACK signal indicative of whether or not
re-transmission is required and reception quality
information which la CQl'a is possible, and the CQ1 ' a
and SC member information are not transmitted . The amount
of signal-5 transmited through the uplink is therefore
reduced to an extreme 1eve1,
Further, according to Embodiment S, designation
while selecting sub-carriers forwhichcQI'sare generated
may be achieved simply by transmitting designation.
information, designating the number of CQI h s from che base
station apparatus It is therefore possible to reduce
the. amount of signal transmitted through the uplink Without
increasing the amount of signal transmitted through the
downlink
49

In Embodiment 5, wiraless communication apparatus
1400 spreads, sub-earners by seletcmg user-specihc
spreading codes and spreading sub-carriers allocated with
ACK, signals cr NACK signal s , however, this is by no means
limiting, and it is also possible to perform scrambling
by selecting user-specific scrambling cades and
allocating ACK signals or NACK signals using the selected
scrambling cades.
In Embodiments 1 Co 5, 64 sub-carriers are allocated
within - communication based FI but this is by no means
limiting find, it is also possible to allocate an arbitrary
number of sub-carrier other than 64.
The wireless communication apparatus of Embodiments
1 to 5 may also be applied to a communication terminal
apparatus .
In Embodiments 3 to 5, sub-earners to be selected
are determined using a threshold determination for
reception quality for edeb sub-earner, but IL is alao
possiblereselect just the number of sub-carriers notified
by an upper order station as m Embodiment 1.
Each functional block employed in the description
at each of the afore mentioned embodiments may be typically
implemented as an LSI which is an integrated circuit- .
These Tnay be integrated into cliips individualj,
or may be integrated into chips in such a iranner that
each includes part or all of them.
50

An LSI is adopted here but this may also be referred
to as ", " , "system LSI", "super LSI", or "ultra LSI"
depending on a difference in degree of integration -
Further, a method of circuit integration 13 not
limited no LSI'3, and implementation using dedicated
circuitry or general purpose processors as also possible
After LSI manufacturing, utilization of a
programmable FPGA (Field Programmable Gate Array) or a
record igurable processov where connections and setting3
of circuit cells within an LSI can be reconfigured is
also possible
Further, lf circuit integratiou technology comes
out to replace LSI's as a result of the advancement at
semi conduct or technology or another derivative
terminology it is, of course, possible to carry Out
functional block interagation using such technology.
Application in biotechnology is also possible.
As described above, according to the preasnt
invention, ijy reducing the a-nount of signal transmittefi,
it is possible to increase the data capacity that can
be trsiismitted and reduce power consumption and, by
reducing interference with respect cc ether wireless
communication apparatuses, it is possible to increase
ayscem capacity
This spec 1 ficacicsji is baaed on Japanese patent
application. Ho 2003-288162, filed on August 6th, 2003,
51

the entire concent of with is expressly incorporated
by reference herein
Industrial Applicatoility
The wireless communication apparatus and reception
quality reporting method of the present invention, are
capable 01 increasing data capacity that cantiet transmitted
and reducing power" consumption by reducing the amount
of cooling. SIGNAL tyransmitted have- an advantage of
incressing system capacity by reducing interference uith
rasper, t to Other wireless communication apparatuses , and
suitable forase in giving reporting of reception gu^lity
for wireless communication apparatus
52

CLAIMS
A Wireless communication apparatus comprising:
a. measuring section char leasures arcception guality
of each of a plurality of sub-carrier wichih a
communication band from a received signal,
a selecting section that selects a sub-carrier
satisfying s. predetermined condition relating to 3
measured reception quality from the plurality of.
sub-camera, and
a reporting section thac gives a reporting of a
selection result of the selecting section.
2 The wireless coniindnieat ion apparatus according to claim
1, fisrt her comprising an acquis itionsection that acquires
information indicating desigration from a higher'level
stall on apparatus , wherein the selecting section selects
a sub-carrier satisfying the predetermined condition
in accordance with information indicating the
designate on.
3 The wireless communication apparatus according to
claim 2, wherein the reporting section transmits receptien
quality information only for a selected sub-carrier to
give a reporting of the selection result
4, The wireless communication apparatus according tJ
claim 1, -wherein the acquiszution section acqmiss
53

information indicating a manner of sub-carriers to be
selected, and the selecting section selects the number
of sub-carriers in. descending order of measured reception
quality
5. The wireless communication apparatus according no
claim 2, wherein the acquisition section acquires
infortiation indicating a reception quality threshold
value, and the selecting section selects Suh-carrieis
with measured reception qualicy Exceeding the threshold
value.
6. The wireless comnunication apparatus according :o
claim 3 (wherein the reporting section transmits reception
quality information with a selected sub-carrier or within
a sub-carrier having a one-to-one correspondence with
the selected sub-carrier
7, Tiie wireless communication apparatus according to
claim 6, further compriaina a spreading section thai;
spread & the reception quality information using aspecaf ic
spreading code for eachuser , wherein the importing section
transmits spread reception quality information.
S . The wireless communication apparatus according to
claim 3, wherein the repcrcing section transmits
identification information of one bit indicating that
54

the selected sub-carrier satisfies the predetermined
condition as the reception quality information
9 The wireless communication apparatus according to
claim 3, further comprising an error detection section
that carries out error detection on the received signal,
wherin the reporting section transmits a signal
indicating a result of error detection as the reception
quality information
10 The wireless communication apparatus according to
claim 3 , wherein the reporting section transmits a relative
va1ue between a. value generated based on reception, quality
at the. selected sub-carrier and a predetermined Value
aa the reception quality information.
11- A communication terminal apparatus comprising the
wireless communication apparatus according to claim I,
12 A base station apparatus comprising
a modulating section that modulates packet; data using
an M-ary number adaptively selected based on a reporting
of a selection result where a sub-carrier satisfying a
predetermined condition relating CO receptior quality
at an opposing communication apparatus is selected from
a plurality ot sub-carriers within a communication bar.d,
as. encoding section tbat encodes the packet data
55

using an encoding rate adoptively selected based on the
reporting, and
a scheduling section that identifies a sub-carrier
satisfying the predetermined condition basea. on the
repoirting, and carries out scheduling go that packet data
of a higher M- ary number or encoding rate to an 1 dent if led
sub-carrier having superior reception quality-
13 A reception quality reporting method comprising
a measuring step of measuring reception quality of
a plurality at sub-carriers within a communication band
from a received signal every sub-carrier
a selection step of selecting a sub-carrier
reception quality from the plurality of sub-carrier;
and
a report ing step of giving reporting of a selection
result of the selection step
13 A wireless communication apparatiig, A race station
apparatus and A lecieption quality reporting method
substantially as herein dsscnbea with refsrence to
accompanying drawings
Dated 09 February, 2006

56

A wireless communication apparatus is capable of
increasing data capacity that can be transmitted and
reducing power consumption by reducing the amount or
control signal to be transmitted , and capable of increasing
system capacity by reducing interference with respect
to other wireless communication apparatuses
in this apparatus, control information extraction
section 1105) extracts information indicating my the number
of CQI's contained in control information
Reception quality measuring sections (113-1 to
I13-n) measure reception quality of each sub-carrier
Within a communication band
CQI generating section (1H) generates CQX's for
sorae of the sub-carriers of superior reception quality
withn tie communication band
Multiplexer (122) multiplexes CQI's, sub-carricr
numoer information generating the CQI's, and ACK signals
or HACK signals
The 50 selecting section 1127] then selects the number of
sub-carriers from J base station apparatus of superior reception quality
allocated using the CQI quantity designation information.

Documents:

00352-kolnp-2006-abstract.pdf

00352-kolnp-2006-claims.pdf

00352-kolnp-2006-description complete.pdf

00352-kolnp-2006-drawings.pdf

00352-kolnp-2006-form-1.pdf

00352-kolnp-2006-form-2.pdf

00352-kolnp-2006-form-3.pdf

00352-kolnp-2006-form-5.pdf

352-KOLNP-2006-FORM-27.pdf

352-kolnp-2006-granted-abstract.pdf

352-kolnp-2006-granted-claims.pdf

352-kolnp-2006-granted-correspondence.pdf

352-kolnp-2006-granted-description (complete).pdf

352-kolnp-2006-granted-drawings.pdf

352-kolnp-2006-granted-examination report.pdf

352-kolnp-2006-granted-form 1.pdf

352-kolnp-2006-granted-form 13.pdf

352-kolnp-2006-granted-form 18.pdf

352-kolnp-2006-granted-form 2.pdf

352-kolnp-2006-granted-form 26.pdf

352-kolnp-2006-granted-form 3.pdf

352-kolnp-2006-granted-form 5.pdf

352-kolnp-2006-granted-others.pdf

352-kolnp-2006-granted-reply to examination report.pdf

352-kolnp-2006-granted-specification.pdf


Patent Number 235661
Indian Patent Application Number 352/KOLNP/2006
PG Journal Number 31/2009
Publication Date 31-Jul-2009
Grant Date 29-Jul-2009
Date of Filing 17-Feb-2006
Name of Patentee PANASONIC CORPORATION
Applicant Address 1006,OAZA KADOMA, KADOMA-SHI, OSAKA 571-8501
Inventors:
# Inventor's Name Inventor's Address
1 NISHIO, AKIHIKO 12-2-402, GREEN HAITSU, YOKOSUKA-SHI, KANAGAWA 239-0846
2 CHENG, JUN 5-1-3-15-402, KABUTODAI, KIZU-CHO, SORAKU-GUN, KYOTO 619-0224
PCT International Classification Number H04B 7/26
PCT International Application Number PCT/JP2004/011499
PCT International Filing date 2004-08-04
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 2003-288162 2003-08-06 Japan