Case 2:20-cv-00310-JRG Document 1-7 Filed 09/20/20 Page 1 of 31 PageID #: 150
`
`Exhibit 7
`
`
`
`
`
`
`
`
`

`

`USOO8254335B2
`
`(12) United States Patent
`Nishi0 et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 8,254,335 B2
`*Aug. 28, 2012
`
`(54) RADIO COMMUNICATION APPARATUS AND
`RADIO COMMUNICATION METHOD
`
`(56)
`
`References Cited
`
`(75) Inventors: Akihiko Nishio, Yokosuka (JP):
`Katsuhiko Hiramatsu, Yokosuka (JP)
`(73) Assignee: Panasonic Corporation, Osaka (JP)
`c
`- r
`(*) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 160 days.
`This patent is Subject to a terminal dis
`claimer.
`
`(21) Appl. No.:
`
`10/540,401
`
`Nov. 20, 2003
`
`PCT/UP03/14778
`
`(22) PCT Filed:
`(86). PCT No.:
`S371 (c)(1),
`(2), (4) Date:
`(87) PCT Pub. No.: WO2004/062148
`PCT Pub. Date: Jul. 22, 2004
`
`Jun. 23, 2005
`
`(65)
`
`(30)
`
`Prior Publication Data
`US 2006/0O891 O2 A1
`Apr. 27, 2006
`
`Foreign Application Priority Data
`
`Dec. 26, 2002 (JP) ................................. 2002-378O76
`
`(51) Int. Cl.
`(2009.01)
`H0474/00
`(52) U.S. Cl. .................. 370/332:455/452. 1:455/452.2:
`455/453; 370/329; 370/330; 370/331
`(58) Field of Classification Search .................. 455/522,
`455/452, 453, 512,513
`See application file for complete search history.
`
`U.S. PATENT DOCUMENTS
`5,726,978 A * 3/1998 Frodigh et al................. 370,252
`6, 130,882 A * 10/2000 Levin ............................ 370,252
`6,330.429 B1* 12/2001. He ..........
`... 455/67.11
`6,400,699 B1* 6/2002 Airy et al. ..................... 370,329
`6,587,510 B1* 7/2003 Minami et al. ...
`375,285
`6,654,431 B1 * 1 1/2003 Barton et al. ......
`... 375,346
`6,721,569 B1 * 4/2004 Hashem et al. ............... 455,450
`(Continued)
`
`
`
`EP
`
`FOREIGN PATENT DOCUMENTS
`1052821
`11, 2000
`(Continued)
`
`OTHER PUBLICATIONS
`Japanese Office Action dated Jul. 27, 2006 with English translation.
`(Continued)
`Primary Examiner — Lester Kincaid
`Assistant Examiner — Mehmood B Khan
`(74) Attorney, Agent, or Firm — Seed IP Law Group PLLC
`
`ABSTRACT
`(57)
`A CIR measuring section 307 measures CIRs of all blocks
`received and a block selection section 308 makes a threshold
`decision based on the CIR measurement result and threshold
`information according to an amount of traffic in the own cell
`and neighboring cells. As a result of the threshold decision,
`blocks whose CIRs exceed the threshold are regarded as
`usable blocks. A CIR averaging section 309 averages the
`CIRs of the usable blocks and a COI generation section 310
`generates a COI based on the CIR average value. The CQI
`generated and selected block numbers are reported to a base
`station apparatus. This allows the throughput of the own cell
`and neighboring cells to be improved.
`
`2 Claims, 20 Drawing Sheets
`
`Case 2:20-cv-00310-JRG Document 1-7 Filed 09/20/20 Page 2 of 31 PageID #: 151
`
`HGH MCS LEVEL ASSIGNED
`
`RECEPTION POWER
`
`t2
`
`t1
`
`TIME
`
`LOW MCS LEVEL ASSIGNED
`
`

`

`US 8,254,335 B2
`Page 2
`
`U.S. PATENT DOCUMENTS
`6,748.222 B1* 6/2004 Hashem et al. ............... 455,453
`6,836,484 B2 12/2004 Suzuki
`7,372,836 B2
`5 2008 Hwang
`7,471,745 B2 * 12/2008 Anim-Appiah et al. ...... 375,324
`2002fO147017 A1 10, 2002 Li et al.
`2002fO159422 A1 10, 2002 Li et al.
`2002fO163879 A1 11, 2002 Li et al.
`2003/006O165 A1
`3f2003 Horisaki ...................... 455,674
`2003, OO72395 A1 *
`4, 2003 Jia et al. ...
`375,341
`2004/0009786 A1* 1/2004 Terry ..........
`455,522
`2004/O125743 A1* 7, 2004 HaShem et all
`370,208
`2004/0203476 A1* 10, 2004 Liu .............
`... 455/69
`2004/0203991 A1* 10, 2004 Chen et al. .................... 455,522
`2005/0135320 A1* 6/2005 Tiedemann et al. .......... 370,338
`38.S; A. : 13S. R et al. ...
`4. 9.g:
`OmatSu ........
`2006/0056283 A1
`3f2006 Anikhindietal
`370,208
`2006, OO88007 A1* 4, 2006 Jalali et al. .....
`... 370,334
`2006,008.9102 A1* 4, 2006 Nishio et al.
`455/67.11
`2006/O126493 A1* 6/2006 Hashem et al.
`... 370,208
`2008/0317158 A1* 12/2008 Ketchum et al.
`375,267
`2009/0104.877 A1* 4/2009 Nishio et al. ................. 455/67.7
`2009/0279498 A1* 11/2009 Li et al. ......................... 370,329
`2010, 0080267 A1* 4/2010 Gerakoulis ....
`375,144
`2011/0080923 A1* 4/2011 McCloud et al. ............. 37O/479
`
`
`
`EP
`JP
`
`FOREIGN PATENT DOCUMENTS
`1065818
`1, 2001
`T-322219
`12/1995
`
`JP
`E.
`JP
`JP
`JP
`JP
`JP
`WO
`WO
`WO
`WO
`WO
`
`11508417
`208,576
`2000324081
`2001 (103034
`2001.238269
`2002/21 7825
`2002-369258
`97012.56
`OO36776
`O2,37872
`O2,493.05
`O2/10 1951
`
`7, 1999
`8
`11, 2000
`4/2001
`8, 2001
`8, 2002
`12/2002
`1, 1997
`6, 2000
`5, 2002
`6, 2002
`12/2002
`
`OTHER PUBLICATIONS
`PCT International Search Report dated Mar. 9, 2004.
`gress RAn-1 Meeting #28bis, Espoo, Finland, Oct. 8-9, 2002,
`pp. - 12.
`& 8
`3GPP TSG-WG1:29: Comments on frequency scheduling and joint
`power and rate optimization for OFDM.” Lucent technologies, Nov.
`5-8, 2002. Shanghai, China, pp. 1-4.
`Japanese Office Action DatedMar. 4, 2008 with English Translation.
`Japanese Office Action dated Jul. 15, 2008 with English translation
`thereof.
`Supplementary European Search Report dated Dec. 6, 2011, for
`corresponding EP Application No. 03774.072.7, 4 pages.
`Japanese Notice of the Reasons for Rejection dated Aug. 24, 2010.
`
`* cited by examiner
`
`Case 2:20-cv-00310-JRG Document 1-7 Filed 09/20/20 Page 3 of 31 PageID #: 152
`
`

`

`U.S. Patent
`
`Aug. 28, 2012
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`Case 2:20-cv-00310-JRG Document 1-7 Filed 09/20/20 Page 4 of 31 PageID #: 153
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`Aug. 28, 2012
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`Aug. 28, 2012
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`US 8,254,335 B2
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`Case 2:20-cv-00310-JRG Document 1-7 Filed 09/20/20 Page 8 of 31 PageID #: 157
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`U.S. Patent
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`Aug. 28, 2012
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`U.S. Patent
`
`Aug. 28, 2012
`
`Sheet 20 of 20
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`US 8,254,335 B2
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`

`

`1.
`RADIO COMMUNICATION APPARATUS AND
`RADIO COMMUNICATION METHOD
`
`2
`is under study. The following are examples of the HSDPA
`technology applied to OFDM.
`
`US 8,254,335 B2
`
`TECHNICAL FIELD
`
`CONVENTIONALEXAMPLE1
`
`The present invention relates to a radio communication
`apparatus and radio communication method in a multicarrier
`transmission, and is suitable for use in, for example, an
`OFDM (Orthogonal Frequency Division Multiplex) commu
`nication terminal apparatus.
`
`10
`
`BACKGROUND ART
`
`15
`
`25
`
`30
`
`In a conventional W-CDMA (Wideband-Code Division
`Multiple Access) mobile communication system, a downlink
`high-speed packet transmission scheme (HSDPA: High
`Speed Downlink Packet Access) is being developed under
`which a high-speed, large-capacity downlink channel is
`shared among a plurality of communication terminal appara
`tuses and packet data is transmitted from a base station appa
`ratus to a communication terminal apparatus at high speed.
`Here, HSDPA in a W-CDMA system will be explained
`briefly. A communication terminal apparatus measures a
`reception CIR (Carrier to Interference Ratio) and reports
`information (e.g., COI: Channel Quality Indicator) indicating
`a downlink channel condition to a base station apparatus
`based on the measured CIR. The base station apparatus deter
`mines a communication terminal apparatus to which packet
`data is to be sent (transmission destination apparatus) based
`on CQIS reported from the respective communication termi
`nal apparatuses. This is called "scheduling.” Furthermore, the
`base station apparatus determines according to what modu
`lation scheme and what coding rate (MCS: Modulation and
`35
`Coding Scheme) packet data to be sent to the transmission
`destination apparatus should be processed based on the down
`link channel condition indicated by the CQI. This is called
`“MCS assignment. The base station apparatus sends packet
`data to the determined transmission destination apparatus
`according to the determined MCS.
`As a specific example of MCS assignment, Suppose a case
`where a fading variation as shown in FIG. 1 occurs. FIG. 1
`illustrates a time variation of reception power due to fading.
`Suppose, the horizontal axis shows a time, the vertical axis
`shows reception power, and the reception power becomes a
`maximum at t1 and the reception power becomes a minimum
`at t2. It is decided that the propagation path is in a good
`condition attl and a high MCS level (e.g., 16QAM, coding
`rate 34) is assigned. On the other hand, it is decided that the
`50
`propagation path is in a poor condition at t2 and a low MCS
`level (e.g., QPSK, coding rate 4) is assigned. That is, when
`the propagation path is in a good condition, high-speed trans
`mission is possible.
`Therefore, ifa communication terminal apparatus assigned
`a high MCS level is determined as the transmission destina
`tion, it is possible to send a large amount of data in a short time
`and thereby improve throughput of the system.
`Furthermore, a conventional W-CDMA system maintains
`reception quality per bit by controlling transmit power, while
`the HSDPA can maintain reception quality per bit by control
`ling the MCS as described above.
`The above described HSDPA is a technology based on the
`premise that it is used for a W-CDMA system, and the appli
`cation of the HSDPA technology to an OFDM (Orthogonal
`Frequency Division Multiplexing) communication apparatus
`which is a promising next-generation communication scheme
`
`40
`
`45
`
`55
`
`60
`
`65
`
`A communication terminal apparatus measures reception
`CIRs of all subcarriers and reports a COI to a base station
`apparatus based on the measured CIRs. Based on the CQIs
`reported from the respective communication terminal appa
`ratuses, the base station apparatus performs scheduling and
`MCS assignment and carries out transmission using all the
`subcarriers. Furthermore, the base station apparatus distrib
`utes Subcarriers uniformly over all frequencies and send the
`Subcarriers. Furthermore, the base station apparatus also pre
`pares subcarriers not to be used to reduce interference with
`neighboring cells. When the number of users of the neighbor
`ing cells increases, it is possible to prevent a lot of interfer
`ence with the neighboring cells by increasing the number of
`Subcarriers not to be used and improve the system throughput.
`FIG. 2 illustrates a frequency assignment method in con
`ventional example 1. Here, assuming the number of users is 2.
`a situation in which frequencies areassigned to UE1 and UE2
`is shown as an example. Suppose a frequency band used in the
`system is 5 MHz and the number of subcarriers is 512. In
`conventional example 1, as shown in FIG. 2, all Subcarriers
`are assigned in order of UE1, UE2 and unassigned Subcarrier
`(assigned to no target). Subcarriers assigned to no target are
`assigned between UE1 and UE2 subcarriers.
`
`CONVENTIONALEXAMPLE 2
`
`In conventional example 2, a communication terminal
`apparatus measures reception CIRS of all Subcarriers and
`reports CQI to a base station apparatus based on the measured
`reception CIRS. The base station apparatus determines a com
`munication terminal apparatus as the transmission destina
`tion (can also be plural), MCS and subcarriers based on the
`CQIs reported from the respective communication terminal
`apparatuses.
`From the next time of transmission on, the communication
`terminal apparatus generates a COI based on the CIRs of the
`assigned Subcarriers and reports this COI to the base station
`apparatus. When the base station apparatus uses the same
`Subcarriers for the communication terminal apparatus next
`time, it is possible to realize MCS assignment according to a
`more accurate CQI. FIG. 3 conceptually shows this method.
`FIG. 3 conceptually shows a communication method in
`conventional example 2. This figure assumes a case where
`Node B (base station apparatus) is communicating with UE1
`to 3 (communication terminal apparatus 1 to 3). First, UE1 to
`3 send CQIs about all subcarriers to Node B in the initial
`transmission ((1) in the figure). Node B carries outscheduling
`based on the transmitted CQIs and starts to transmit data (2)
`in the figure). For the next time transmission, UE1 to 3 trans
`mit CQIs about assigned frequencies (subcarriers) to Node B
`((3) in the figure) Node B carries out scheduling for the next
`time transmission and transmits data to UE3 ((4) in the figure)
`. In this example, in (2) in the figure, Suppose Node Bassigns
`frequencies (subcarriers) to UE1 to 3 as shown in FIG. 4.
`FIG. 4 illustrates a frequency assignment method in con
`ventional example 2. Here, only parts different from FIG. 2
`will be explained and assuming that the number of users is 3.
`a situation in which frequencies are assigned to UE1 to 3 is
`shown. In conventional example 2, neighboring Subcarriers
`are collectively assigned to users and unassigned Subcarriers
`(assigned to no target) are provided to reduce interference
`with neighboring cells.
`
`Case 2:20-cv-00310-JRG Document 1-7 Filed 09/20/20 Page 24 of 31 PageID #: 173
`
`

`

`US 8,254,335 B2
`
`10
`
`3
`However, above described conventional examples 1 and 2
`have a problem that Subcarriers having low reception power
`may be assigned. This will be explained using FIG.5 and FIG.
`6.
`FIG. 5 conceptually shows reception power of subcarriers
`assigned in conventional example 1 at the communication
`terminal apparatus. Here, the state of reception power is
`shown as case 1 (FIG. 5A) and case 2 (FIG. 5B). As is seen
`from this figure, both Subcarriers having high reception
`power (in a good propagation situation) and Subcarriers hav
`ing low reception power (in a bad propagation situation) are
`assigned.
`Furthermore, FIG. 6 conceptually shows reception power
`of Subcarriers assigned in conventional example 2 at the com
`15
`munication terminal apparatus. FIG. 6 also shows states of
`reception power similar to those in FIG.5 as case 1 (FIG. 6A)
`and case 2 (FIG. 6B). According to this method, it is possible
`to transmit data with an MCS according to a propagation
`situation of subcarriers, but as shown in FIG. 6, subcarriers
`having low reception power (in a bad propagation situation)
`are assigned, resulting in a low MCS level. Especially, in the
`situation of case 2, all the Subcarrier assigned may have low
`reception power.
`In this way, data transmitted with subcarriers with reduced
`reception power cannot be decoded, retransmission of the
`data may be requested or data may be transmitted with a low
`MCS level, which causes throughput to be reduced.
`Furthermore, the communication terminal apparatus may
`also generate CQIS for all Subcarriers separately and report
`them to the base station apparatus, but this may increase the
`number of transmission bits for reports and overweigh the
`uplink.
`Furthermore, for example, in a system of reuse 1 (fre
`quency iteration 1) using the same frequency in neighboring
`cells as shown in FIG. 7, a signal transmitted by Node Bit 1 to
`a UE in the own cell becomes interference with neighboring
`cells (Nodes Bil2 and #3). In such a system, the number of
`subcarriers used in the own cell determines interference with
`neighboring cells and a large amount of interference with
`neighboring cells will cause the throughput of the entire sys
`tem to reduce. For this reason, it is necessary to carry out
`transmission with a limited number of subcarriers efficiently.
`
`4
`FIG. 4 illustrates a frequency assignment method in con
`ventional example 2:
`FIG. 5A conceptually illustrates reception power of sub
`carriers assigned in conventional example 1 at a communica
`tion terminal apparatus;
`FIG. 5B conceptually illustrates reception power of sub
`carriers assigned in conventional example 1 at the communi
`cation terminal apparatus;
`FIG. 6A conceptually illustrates reception power of sub
`carriers assigned in conventional example 2 at the communi
`cation terminal apparatus;
`FIG. 6B conceptually illustrates reception power of sub
`carriers assigned in conventional example 2 at the communi
`cation terminal apparatus;
`FIG. 7 illustrates a conceptual view showing a situation of
`interference with neighboring cells in a system of reuse 1:
`FIG. 8 is a schematic diagram conceptually illustrating
`subcarrier blocks;
`FIG.9 is a block diagram illustrating the configuration of a
`transmission system of a base station apparatus according to
`Embodiment 1 of the present invention;
`FIG. 10 is a block diagram showing the configuration of a
`reception system of a communication terminal apparatus
`according to Embodiment 1 of the present invention;
`FIG. 11A illustrates a method of selecting usable blocks in
`Embodiment 1 of the present invention;
`FIG. 11B illustrates a method of selecting usable blocks in
`Embodiment 1 of the present invention;
`FIG. 12 illustrates an example of block assignment accord
`ing to Embodiment 1 of the present invention;
`FIG. 13A illustrates a method of selecting usable blocks
`according to Embodiment 1 of the present invention;
`FIG. 13B illustrates a method of selecting usable blocks
`according to Embodiment 1 of the present invention;
`FIG. 14 illustrates a block assignment example according
`to Embodiment 1 of the present invention;
`FIG. 15 is a block diagram showing the configuration of a
`transmission system of a base station apparatus according to
`Embodiment 2 of the present invention;
`FIG. 16A illustrates a method of selecting usable blocks
`according to Embodiment 2 of the present invention;
`FIG. 16B illustrates a method of selecting usable blocks
`according to Embodiment 2 of the present invention;
`FIG. 17 illustrates a block assignment example according
`to Embodiment 2 of the present invention;
`FIG. 18 is a block diagram showing the configuration of a
`transmission system of a base station apparatus according to
`Embodiment 3 of the present invention;
`FIG. 19 is a block diagram showing the configuration of a
`reception system of a communication terminal apparatus
`according to Embodiment 3 of the present invention:
`FIG. 20A illustrates a method of selecting usable blocks
`according to Embodiment 3 of the present invention; and
`FIG. 20B illustrates a method of selecting usable blocks
`according to Embodiment 3 of the present invention.
`
`BEST MODE FOR CARRYING OUT THE
`INVENTION
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`DISCLOSURE OF INVENTION
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`45
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`It is an object of the present invention to provide a radio
`communication apparatus and radio communication method
`that improve throughput of the own cell and neighboring
`cells.
`The present invention attains the above described object by
`selecting Subcarriers of high reception quality as Subcarriers
`to be used based on a criterion determined by amounts of
`traffic of the own cell and neighboring cells, creating a report
`value indicating average reception quality of the selected
`Subcarriers and reporting the report value created and infor
`mation indicating the Subcarriers to be used to the other party
`of communication.
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`BRIEF DESCRIPTION OF DRAWINGS
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`FIG. 1 illustrates a time variation of reception power due to
`fading:
`FIG. 2 illustrates a frequency assignment method in con
`ventional example 1:
`FIG.3 conceptually illustrates a communication method in
`conventional example 2:
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`With reference now to the attached drawings, embodi
`ments of the present invention will be explained below.
`According to embodiments of the present invention, as
`shown in FIG. 8, Suppose assignment is performed in block
`units assuming that the number of Subcarriers to be used is
`512, one subcarrier block (hereinafter simply referred to as
`“block') consists of 32 subcarriers and a total of 16 blocks are
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`US 8,254,335 B2
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`5
`used unless specified otherwise. Each block is assigned a
`number (block number) for identifying the block.
`
`Embodiment 1
`
`6
`Y/X,Y =1/10, the CIR threshold to be set is 0 dB. The threshold
`information calculated in this way is output to the control data
`processing section 207.
`The control data processing section 207 carries out coding
`processing (coding section 207-1) on the threshold informa
`tion output from the threshold calculation section 206, modu
`lation processing (modulation section 207-2) and mapping
`(subcarrier mapping section 207-3) to subcarriers and outputs
`the processing result to the multiplexing section 208.
`The multiplexing section 208 multiplexes the transmission
`data, control data including threshold information, a pilot
`line, output from the subcarrier mapping sections 205-1, 205
`2, 207-3 respectively, and outputs the multiplexed data to an
`S/P conversion section 209. The S/P conversion section 209
`converts the multiplexed signal output from the multiplexing
`section 208 to a plurality of lines of transmission data and
`outputs the lines of transmission data to an IFFT section 210.
`The IFFT section 210 carries out an inverse fast Fourier
`transform on the plurality of lines of transmission data output
`from the S/Pconversion section 209, thereby forms an OFDM
`signal and outputs the OFDM signal to a GI insertion section
`211. The GI insertion section 211 inserts a guard interval (GI)
`into the OFDM signal output from the IFFT section 210 and
`outputs the OFDM signal to a radio processing section 212.
`The radio processing section 212 carries out predetermined
`radio processing Such as D/A conversion and up-conversion
`on the signal output from the GI insertion section 211 and
`transmits the signal Subjected to the radio processing to a
`communication terminal apparatus through an antenna.
`FIG. 10 is a block diagram showing the configuration of a
`reception system of a communication terminal apparatus
`according to Embodiment 1 of the present invention. In this
`figure, a radio processing section 301 receives the signal sent
`from the base station apparatus through an antenna, carries
`out predetermined radio processing Such as down-conversion
`and A/D conversion on the received signal and outputs the
`signal after the radio processing to a GI elimination section
`302. The GI elimination section 302 removes the guard inter
`Val from the signal output from the radio processing section
`301 and outputs the signal deprived of the guard interval to an
`FFT section 303. The FFT section 303 carries out a fast
`Fourier transform on the signal output from the GI elimina
`tion section 302 and thereby acquires signals transmitted
`through the respective blocks. The acquired signals in block
`units are output to a channel separation section 304.
`The channel separation section 304 separates the signals in
`block units (actually in subcarrier units) output from the FFT
`section 303 into userspecific lines and extracts a data section,
`pilot section and control data section (including threshold
`information) directed to the own apparatus. The extracted
`data section is output to a demodulation section 305-1, Sub
`jected to demodulation processing by the demodulation sec
`tion 305-1 and output to a decoding section 306-1. The decod
`ing section 306-1 decodes the demodulated signal output
`from the demodulation section 305-1 and extracts the user
`data. On the other hand, the control data section extracted by
`the channel separation section 304 is output to a demodula
`tion section 305-2, subjected to demodulation processing by
`the demodulation section 305-2 and output to a decoding
`section 306-2. The decoding section 306–2 decodes the
`demodulated signal output from the demodulation section
`305-2, extracts the control data and outputs the threshold
`information included in the control data to a block selection
`section 308. Furthermore, the pilot section extracted by the
`channel separation section 304 is output to a CIR measuring
`section 307 as a reception quality measuring section, where
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`FIG. 9 is a block diagram showing the configuration of a
`transmission system of a base station apparatus according to
`Embodiment 1 of the present invention. In this figure, a sched
`uler section 201 determines (scheduling) to which communi
`cation terminal apparatus transmission in the next frame is
`carried out based on a COI reported from each communica
`tion terminal apparatus in communication and outputs the
`determined scheduling information to a user selection section
`202. As an algorithm of this scheduling, Max C/I, Propor
`tional Fairness, etc., is available. Furthermore, when a user
`signal to be transmitted is determined through the scheduling,
`a modulation scheme and coding rate (MCS: Modulation and
`Coding Scheme) are assigned to the user signal and the
`assigned MCS is notified to coding sections 203-1, 203-2 and
`modulation sections 204-1, 204-2. Furthermore, at the same
`time the scheduler section 201 receives a report on usable
`block numbers from each communication terminal apparatus
`and determines which of the reported blocks is used for each
`communication terminal apparatus and notifies it to the Sub
`carrier mapping sections 205-1, 205-2.
`The user selection section 202 temporarily stores transmis
`sion data to be sent to each communication terminal appara
`tus (assumed to be UE1 to UE3 in this figure as an example),
`selects data to be sent to the communication terminal appa
`ratus which becomes the transmission destination according
`to the scheduling information output from the scheduler sec
`tion 201 and outputs the data to the coding sections 203-1,
`203-2.
`According to this embodiment, there are two lines of sys
`35
`tem that carry out coding, modulation and Subcarrier map
`ping, the user selection section 202 can select two pieces of
`transmission data and perform processing of the same con
`tents in parallel on the respective lines. Therefore, only one
`line of system will be explained. In addition, one more line of
`40
`system is provided as a control data processing section 207
`that carries out coding, modulation and Subcarrier mapping
`on control data. The control data processing section 207 will
`be explained later.
`The coding section 203-1 carries out coding processing on
`transmission data output from the user selection section 202
`using a turbo code, etc., at a coding rate notified from the
`scheduler section 201 and outputs the processed data to the
`modulation section 204-1. The modulation section 204-1 car
`ries out modulation processing on the transmission data out
`put from the coding section 203-1 according to the modula
`tion scheme notified from the scheduler section 201 and
`outputs the modulated data to the Subcarrier mapping section
`205-1. The subcarrier mapping section 205-1 maps the modu
`lated transmission data output from the modulation section
`55
`204-1 to a subcarrier determined by the scheduler section 201
`and outputs the mapped data to the multiplexing section 208.
`A threshold calculation section 206 calculates a CIR
`threshold which is a selection criterion for selecting usable
`blocks at the communication terminal apparatus based on
`60
`information on traffic in the own cell and neighboring cells. A
`CIR threshold (Th) is calculated, for example, as
`The S-10 log (Yo/XY). At this time. So denotes a reference
`CIR and is, for example, -10 dB. Yo denotes an amount of
`traffic in the own cell and 10 log (Yo/XY) is a ratio (dB) of the
`amount of traffic in the own cell to the total amount of traffic
`in the own cell and 6 neighboring cells. When S-10 dB.
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`8
`At the base station apparatus, the scheduler section 201
`assigns blocks based on CQIs reported from the respective
`communication terminal apparatuses and usable block num
`bers. FIG. 12 illustrates an example of block assignment
`according to Embodiment 1 of the present invention. Here,
`the number of communication terminal apparatuses to which
`blocks areassigned is assumed to be 2 and the communication
`terminal apparatuses are expressed as UE1 and UE2. As
`shown in FIG. 12, the base station apparatus assigns block
`numbers 14 and 15 to UE1 and block numbers 8 to 11 to UE2,
`which is assignme