USOO7206587B2
`
`(12) United States Patent
`Miyoshi et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 7,206,587 B2
`*Apr. 17, 2007
`
`(54) COMMUNICATION TERMINAL
`APPARATUS, BASE STATION APPARATUS,
`AND RADIO COMMUNICATION METHOD
`(75) Inventors: Kenichi Miyoshi, Yokohama (JP);
`Osamu Kato, Yokosuka (JP); Junichi
`Aizawa, Yokohama (JP)
`(73) Assignee: Matsushita Electric Industrial Co.,
`Ltd., Osaka (JP)
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 256 days.
`
`(*) Notice:
`
`This patent is Subject to a terminal dis
`claimer.
`(21) Appl. No.: 10/321,623
`
`(22) Filed:
`
`Dec. 18, 2002
`
`(65)
`
`Prior Publication Data
`US 2004/O2O3829 A1
`Oct. 14, 2004
`
`Related U.S. Application Data
`(63) Continuation of application No. 10/089,605, filed on
`Apr. 1, 2002, now Pat. No. 6,760,590.
`Foreign Application Priority Data
`(30)
`Aug. 2, 2000
`(JP)
`............................. 2000-23442O
`Sep. 20, 2000 (JP)
`............................. 2OOO-285.405
`
`(51) Int. Cl.
`(2006.01)
`H04O 7/20
`(52) U.S. Cl. ............................... 455/452.2:455/452.1;
`455/522; 370/335; 370/318
`(58) Field of Classification Search ................ 455/522,
`455/69, 68, 67.11, 561, 127,452.2, 452.1;
`370/347, 335, 336,529, 337, 476, 318,310
`See application file for complete search history.
`References Cited
`
`(56)
`
`U.S. PATENT DOCUMENTS
`
`6,452,914 B2 * 9/2002 Niemela ..................... 370,337
`RE37,870 E * 10/2002 Nakano et al. ............. 370/342
`6,603,980 B1* 8/2003 Kitagawa et al. ........... 455,522
`
`(Continued)
`
`FOREIGN PATENT DOCUMENTS
`
`EP
`
`O802638
`
`10, 1997
`
`(Continued)
`
`OTHER PUBLICATIONS
`
`European Search Report dated Mar. 5, 2004.
`(Continued)
`Primary Examiner Danh Le
`(74) Attorney, Agent, or Firm—Stevens, Davis, Miller &
`Mosher, LLP
`
`(57)
`
`ABSTRACT
`
`A communication mode determination section 201 deter
`mines the communication mode based on the CIR measured
`by a CIR measurement section 219; a DRC signal creation
`section 202 creates a DRC signal with a number correspond
`ing to the communication mode; and a DRC power control
`ler 205 refers to a transmission power table 206 showing the
`correspondence between DRC numbers and transmission
`power, and, based on the transmission power of the pilot
`signal output from a pilot power controller 209, increases
`transmission power in proportion as the DRC signal indi
`cates that downlink channel quality is good.
`
`5,564,074 A * 10/1996 Juntti ...................... 455, 67.11
`
`4 Claims, 17 Drawing Sheets
`
`214
`RECEWE
`RFSECEON
`
`25
`ESPREADING
`SECTION
`
`216
`
`AAPIWE
`DEMODULATOR
`
`27
`ENE
`SECTION
`
`RECEIVE
`DATA
`
`807
`DESPREADING
`SECTION
`28
`DESPREANG
`SECTION
`
`838
`COMMUNICATION MODE
`DEECON SECON
`29
`CR MEASUREMENT
`SECICN
`
`CRINFORMAION
`CREATON
`SECTION
`
`213
`
`22
`
`UPXER
`
`21
`RANSW
`RFSECTION
`
`20
`
`003
`
`1004
`SPREADING
`sis.
`MULTIPLEXER
`208
`209
`LOPOWR SPREANG
`ILOT
`ExE scN MODULATOR st
`
`CODE WORD
`CODE WORD
`MODULATOR HSES TABLE
`20
`
`
`
`IPR2018-1556
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`

`US 7,206,587 B2
`Page 2
`
`U.S. PATENT DOCUMENTS
`
`11/2003 Abe et al.
`6,651,211 B1
`6/2004 Sadanaka
`6,751,197 B1
`2001/0038630 A1* 11/2001 Tong et al. ................. 370,395
`2001/0050900 A1* 12, 2001 Lee et al. ...
`... 370,232
`2001/0050926 A1* 12, 2001 Kumar ...
`37O/529
`2002/0136.242 A1* 9, 2002 Niemela .....
`370,523
`2002fO155861 A1* 10, 2002 SumaSu et al.
`... 455,561
`2003.0043778 A1* 3, 2003 Luschi et al. .....
`... 370,349
`2005, 0083901 A1* 4/2005 Kim et al. .................. 370,342
`
`
`
`FOREIGN PATENT DOCUMENTS
`
`EP
`EP
`
`O959581
`O986.192
`
`11, 1999
`3, 2000
`
`EP
`JP
`JP
`JP
`JP
`JP
`JP
`WO
`
`O986.282
`11331057
`11331131
`200041.71
`2000049663
`2OOO68959
`2000 124914
`OO13325
`
`3, 2000
`11, 1999
`11, 1999
`1, 2000
`2, 2000
`3, 2000
`4/2000
`3, 2000
`
`OTHER PUBLICATIONS
`Japanese Office Action dated Dec. 21, 2004, with English transla
`tion.
`International Search Report dated Nov. 13, 2001.
`* cited by examiner
`
`IPR2018-1556
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`

`

`U.S. Patent
`
`Apr. 17, 2007
`
`Sheet 1 of 17
`
`US 7,206,587 B2
`
`SELECTION
`FREQUENCY
`
`POOR
`
`2
`
`3
`
`4.
`
`5
`
`DOWNLINK CHANNEL
`GRUALITY
`
`GOOD
`
`DRC
`NUMBER
`
`FIG.
`
`IPR2018-1556
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`U.S. Patent
`
`Apr. 17, 2007
`
`Sheet 3 of 17
`
`US 7,206,587 B2
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`

`U.S. Patent
`
`Apr. 17, 2007
`
`Sheet 4 of 17
`
`US 7,206,587 B2
`
`TRANSMISSION POWER
`(RATIO TO PILOT SIGNAL
`TRANSMISSION POWER)
`
`
`
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`
`FIG.4
`
`IPR2018-1556
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`U.S. Patent
`
`Apr. 17, 2007
`
`Sheet 7 of 17
`
`US 7,206,587 B2
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`HTC EX1001, Page 9
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`U.S. Patent
`
`Apr. 17, 2007
`
`Sheet 8 of 17
`
`US 7,206,587 B2
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`U.S. Patent
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`Apr. 17, 2007
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`Sheet 9 of 17
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`US 7,206,587 132
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`U.S. Patent
`
`Apr. 17, 2007
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`Sheet 10 of 17
`
`US 7,206,587 B2
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`U.S. Patent
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`Apr. 17, 2007
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`Sheet 12 of 17
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`US 7,206,587 B2
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`U.S. Patent
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`Apr. 17, 2007
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`Sheet 13 of 17
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`US 7,206,587 B2
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`U.S. Patent
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`Apr. 17, 2007
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`Sheet 14 of 17
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`US 7,206,587 B2
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`U.S. Patent
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`Apr. 17, 2007
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`Sheet 15 of 17
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`US 7,206,587 B2
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`FROM CR MEASUREMENT SECTION 219
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`U.S. Patent
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`Apr. 17, 2007
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`Sheet 16 of 17
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`U.S. Patent
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`Apr. 17, 2007
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`Sheet 17 of 17
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`US 7,206,587 B2
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`FROM CR MEASUREMENT SECTION 29
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`US 7,206,587 B2
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`1.
`COMMUNICATION TERMINAL
`APPARATUS, BASE STATION APPARATUS,
`AND RADIO COMMUNICATION METHOD
`
`This is a continuation of application Ser. No. 10/089,605
`filed Apr. 1, 2002 now U.S. Pat. No. 6,760,590.
`TECHNICAL FIELD
`
`The present invention relates to a communication terminal
`apparatus, base station apparatus, and radio communication
`method to be used in a cellular communication system.
`BACKGROUND ART
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`The base station then transmits data only to the relevant
`communication terminal in its allocated time. For example,
`if time t1 has been allocated to communication terminal A,
`in time t1 the base station transmits data only to communi
`cation terminal A, and does not transmit data to a commu
`nication terminal other than communication terminal A.
`In this way, data transmission efficiency has convention
`ally been increased for the overall system by setting a
`transmission rate for each communication terminal accord
`ing to channel quality by means of HDR, and performing
`communication resource allocation with priority to a com
`munication terminal with a high transmission rate at which
`communication is possible.
`However, if the communication mode determined by a
`communication terminal is received erroneously by the base
`station due to deterioration of the channel conditions on the
`uplink from the communication terminal to the base station,
`or the like, the base station will transmit data using that
`erroneous mode. As the determined communication mode
`and the communication mode of data transmitted to the
`communication terminal are different, the communication
`terminal cannot demodulate or decode the data.
`Also, when a base station Such as that described above has
`allocated time t1 to communication terminal A, in time t1 the
`base station transmits data only to communication terminal
`A, and does not transmit data to a communication terminal
`other than communication terminal A.
`Due to the above, a problem arises in that, if the com
`munication mode determined by a communication terminal
`is received erroneously by the base station, there will be an
`interval during which time-divided communication
`resources are not used, and downlink throughput falls.
`
`DISCLOSURE OF INVENTION
`
`It is an object of the present invention to provide a
`communication terminal apparatus, base station apparatus,
`and radio communication method that make it possible to
`prevent a fall in downlink throughput in a communication
`system in which communication resources are allocated to
`communication terminals based on downlink channel qual
`ity.
`In order to achieve the above-described object, in the
`present invention, with respect to information, among infor
`mation indicative of downlink channel quality, which has a
`possibility of decreasing the downlink throughput when the
`information is received erroneously in a base station, a
`communication terminal provides such information with
`less Susceptibility to errors in the propagation path to
`transmit. It is thereby possible to prevent the downlink
`throughput from decreasing.
`
`BRIEF DESCRIPTION OF DRAWINGS
`
`FIG. 1 is a graph illustrating DRC signal selection fre
`quency in a base station;
`FIG. 2 is a block diagram showing a configuration of a
`base station according to Embodiment 1 of the present
`invention;
`FIG. 3 is a block diagram showing the configuration of a
`communication terminal according to Embodiment 1 of the
`present invention;
`FIG. 4 is a drawing showing the contents of the trans
`mission power table provided in a communication terminal
`according to Embodiment 1 of the present invention;
`
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`In a cellular communication system, one base station
`performs radio communication with a plurality of commu
`nication terminals simultaneously, and therefore, as demand
`has increased in recent years, so has the need for higher
`transmission efficiency.
`One technology that has been proposed for increasing the
`transmission efficiency of a downlink from a base station to
`a communication terminal is HDR (High Data Rate). HDR
`is a communication method whereby a base station performs
`scheduling for allocating communication resources to com
`munication terminals by time division, and also sets a
`25
`transmission rate for each communication terminal accord
`ing to the downlink channel quality.
`The operations by which a base station and communica
`tion terminals perform radio communication with HDR are
`described below. First, the base station transmits a pilot
`signal to each communication terminal. Each communica
`tion terminal estimates the downlink channel quality using a
`CIR (desired carrier to interference ratio) based on the pilot
`signal, etc., and finds a transmission rate at which commu
`nication is possible. Then, based on the transmission rate at
`35
`which communication is possible, each communication ter
`minal selects a communication mode, which is a combina
`tion of packet length, coding method, and modulation
`method, and transmits a data rate control (hereinafter
`referred to as “DRC) signal indicating the communication
`mode to the base station.
`The type of modulation method that can be used in each
`system is predetermined as BPSK, QPSK, 16QAM,
`64QAM, and so forth. Also, the type of coding that can be
`used in each system is predetermined as /2 turbo code, /3
`turbo code, 3/4 turbo code, and so forth. Further, a plurality
`of transmission rates that can be used in each system are
`predetermined according to a combination of packet length,
`modulation method, and coding method. Each communica
`tion terminal selects a combination whereby communication
`can be performed most efficiently with the current downlink
`channel quality, and transmits a DRC signal indicating the
`selected communication mode to the base station. Generally,
`DRC signals are represented by numbers from 1 to N, with
`a higher number indicating a proportionally better downlink
`channel quality.
`Based on the DRC signal transmitted from each commu
`nication terminal, the base station sets a transmission rate for
`each communication terminal, and sends a signal to each
`communication terminal via a control channel indicating
`communication resource allocation to each communication
`terminal. Generally, taking improvement of system trans
`mission efficiency into consideration, communication
`resources are allocated with priority to the communication
`terminal that has the best downlink channel quality—that is
`to say, the communication terminal that transmits the high
`est-numbered DRC signal.
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`FIG. 5 is a block diagram showing another configuration
`of a base station according to Embodiment 1 of the present
`invention;
`FIG. 6 is a block diagram showing the configuration of a
`communication terminal according to Embodiment 2 of the
`present invention;
`FIG. 7 is a drawing showing the contents of the code word
`table provided in a communication terminal according to
`Embodiment 2 of the present invention;
`FIG. 8 is a block diagram showing the configuration of a
`base station according to Embodiment 3 of the present
`invention;
`FIG. 9 is a block diagram showing the configuration of a
`communication terminal according to Embodiment 3 of the
`present invention;
`FIG. 10 is a block diagram showing a configuration of a
`base station according to Embodiment 4 of the present
`invention;
`FIG. 11 is a block diagram showing the configuration of
`a communication terminal according to Embodiment 4 of
`the present invention;
`FIG. 12 is a block diagram showing another configuration
`of a base station according to Embodiment 4 of the present
`invention;
`25
`FIG. 13 is a block diagram showing the configuration of
`a communication terminal according to Embodiment 5 of
`the present invention;
`FIG. 14 is a block diagram showing the configuration of
`a communication terminal according to Embodiment 6 of
`the present invention;
`FIG. 15 is a block diagram showing the configuration of
`the CIR signal creation section of a communication terminal
`according to Embodiment 6 of the present invention;
`FIG. 16 is a block diagram showing the configuration of
`the CIR signal creation section of a communication terminal
`according to Embodiment 7 of the present invention; and
`FIG. 17 is a block diagram showing the configuration of
`the CIR signal creation section of a communication terminal
`according to Embodiment 8 of the present invention.
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`BEST MODE FOR CARRYING OUT THE
`INVENTION
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`With reference now to the accompanying drawings,
`embodiments of the present invention will be explained in
`detail below.
`(Embodiment 1)
`As stated above, a base station allocates communication
`resources with priority to the communication terminal with
`the best downlink channel quality. In other words, a base
`station selects the highest-numbered DRC signal, and allo
`cates communication resources with priority to the commu
`nication terminal that transmitted that selected DRC signal.
`55
`Thus, DRC signal selection frequency is as shown in FIG. 1.
`FIG. 1 is a graph illustrating DRC signal selection frequency
`in a base station. In this figure, numbers 1 to 5 are used as
`DRC numbers, with a higher number representing a propor
`tionally better channel quality.
`60
`As shown in FIG. 1, the higher the number of a DRC
`signal, the greater is the frequency of its selection by the
`base station. That is to say, the better the downlink channel
`quality of a communication terminal, the higher is the
`frequency with which communication resources are allo
`cated to that communication terminal. This kind of relation
`ship arises from the fact that there are many communication
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`terminals, and there is an increased probability of there
`being a communication terminal with good downlink chan
`nel quality.
`Thus, the selection frequency of each DRC signal differs
`according to channel quality. That is to say, since a DRC
`signal indicating that downlink channel quality is good tends
`to be selected with greater frequency, there is a high prob
`ability that downlink throughput will fall if a DRC signal
`indicating that downlink channel quality is good is received
`erroneously. Also, since a DRC signal indicating that down
`link channel quality is poor tends to be selected with lower
`frequency, there is little effect of producing a fall in down
`link throughput if a DRC signal indicating that downlink
`channel quality is poor is received erroneously.
`Thus, a communication terminal according to Embodi
`ment 1 of the present invention transmits at proportionally
`higher transmission power a DRC signal indicating that
`downlink channel quality is good. Also, a base station
`according to Embodiment 1 of the present invention
`excludes DRC signals with reception power lower than a
`predetermined threshold value in performing communica
`tion resource allocation.
`FIG. 2 is a block diagram showing a configuration of a
`base station according to Embodiment 1 of the present
`invention.
`In FIG. 2, an allocation section 101 determines commu
`nication resource allocation to each communication terminal
`based on DRC signals excluding DRC signals detected by
`unused DRC detection sections 116 described later herein
`from among DRC signals extracted by demodulators 114
`described later herein. Then, based on the determined com
`munication resource allocation, the allocation section 101
`notifies a buffer 102 for output of downlink transmit data,
`indicates the downlink transmit data coding method to an
`adaptive coding section 103, and indicates the downlink
`transmit data modulation method to an adaptive modulator
`104.
`The buffer 102 holds downlink transmit data, and outputs
`downlink transmit data for a predetermined communication
`terminal to the adaptive coding section 103 in accordance
`with the directions of the allocation section 101. The adap
`tive coding section 103 codes the output signal from the
`buffer 102 in accordance with the directions of the allocation
`section 101, and outputs the resulting signal to the adaptive
`modulator 104. The adaptive modulator 104 modulates the
`output signal from the adaptive coding section 103 in
`accordance with the directions of the allocation section 101,
`and outputs the resulting signal to a spreading section 105.
`Spreading section 105 spreads the output signal from the
`adaptive modulator 104, and outputs the resulting signal to
`a multiplexer 108.
`A modulator 106 modulates a pilot signal and outputs it to
`a spreading section 107. Spreading section 107 spreads the
`output signal from the modulator 106, and outputs the
`resulting signal to the multiplexer 108.
`The multiplexer 108 performs time multiplexing of the
`spread pilot signal with the spread downlink transmit data at
`predetermined intervals, and outputs the resulting signal to
`a transmit RF Section 109. The transmit RF Section 109
`converts the frequency of the output signal from the multi
`plexer 108 to radio frequency, and outputs the resulting
`signal to a duplexer 110.
`The duplexer 110 transmits the output signal from the
`transmit RF section 109 as a radio signal from an antenna
`111 to a communication terminal. Moreover, the duplexer
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`110 outputs the signals transmitted from each communica
`tion terminal and received by antenna 111 to receive RF
`section 112.
`A receive RF section 112 converts the frequency of a radio
`frequency signal output from the duplexer 110 to baseband,
`and outputs the resulting signal to a despreading section 113.
`The despreading section 113 despreads the baseband signal
`using the spreading code used to spread the DRC signal, and
`outputs the resulting signal to the demodulator 114 and a
`reception power calculation section 115.
`The demodulator 114 demodulates the output signal from
`the despreading section 113 and extracts the DRC signal,
`and outputs this signal to the allocation section 101.
`The reception power calculation section 115 measures the
`reception power of the despread DRC signal, which is output
`to the unused DRC detection section 116. In the unused
`DRC detection section 116 is set a predetermined threshold
`value, as described later herein, and a DRC signal of
`reception power lower than this threshold value is detected,
`and the result of the detection is output to the allocation
`section 101.
`A despreading section 113, demodulator 114, reception
`power calculation section 115, and unused DRC detection
`section 116 are provided for each communication terminal.
`From each demodulator 114 a DRC signal for the corre
`sponding communication terminal is output, and from each
`unused DRC detection section 116 a detection result for the
`corresponding communication terminal is output.
`FIG. 3 is a block diagram showing the configuration of a
`communication terminal according to Embodiment 1 of the
`present invention. In FIG. 3, a communication mode deter
`mination section 201 determines a communication mode
`indicating a combination of modulation method and coding
`method based on a CIR measured by a CIR measurement
`section 219 described later herein, and outputs the result to
`a DRC signal creation section 202. The communication
`mode determination section 201 also indicates the downlink
`receive data demodulation method to an adaptive demodu
`lator 216, and indicates the downlink receive data decoding
`40
`method to an adaptive decoding section 217, based on the
`determined communication mode.
`The DRC signal creation section 202 creates a DRC
`signal with a number corresponding to the communication
`mode output from the communication mode determination
`section 201, and outputs this DRC signal to a modulator 203
`and DRC power controller 205.
`Modulator 203 modulates the DRC signal and outputs the
`resulting signal to a spreading section 204. Spreading section
`204 spreads the output signal from modulator 203 and
`outputs the resulting signal to the DRC power controller
`205. The DRC power controller 205 refers to a transmission
`power table 206 that shows the correspondence between
`DRC numbers and transmission power, controls the DRC
`signal transmission power based on the transmission power
`55
`of a pilot signal output from a pilot power controller 209
`described later herein, and outputs the DRC signal that has
`undergone transmission power control to a multiplexer 210.
`The actual method of controlling DRC signal transmission
`power will be described later herein.
`A modulator 207 modulates the pilot signal and outputs
`the resulting signal to a spreading section 208. Spreading
`section 208 spreads the output signal from modulator 207
`and outputs the resulting signal to the pilot power controller
`209. The pilot power controller 209 controls the transmis
`sion power of the pilot signal, and outputs the pilot signal
`that has undergone transmission power control to the mul
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`tiplexer 210. The pilot power controller 209 also outputs the
`pilot signal transmission power to the DRC power controller
`205.
`The multiplexer 210 performs time multiplexing of the
`DRC signal that has undergone transmission power control
`and the pilot signal that has undergone transmission power
`control at predetermined intervals, and outputs the resulting
`signal to a transmit RF section 211. The transmit RF section
`211 converts the frequency of the output signal from the
`multiplexer 210 to radio frequency, and outputs the resulting
`signal to a duplexer 212.
`The duplexer 212 transmits the output signal from the
`transmit RF Section 211 as a radio signal from an antenna
`213 to the base station. Also, a signal transmitted as a radio
`signal by the base station and received as a radio signal by
`the antenna 213 is output by the duplexer 212 to a receive
`RF section 214.
`The receive RF section 214 converts the frequency of the
`radio frequency signal output from the duplexer 212 to
`baseband, and outputs the resulting signal to a despreading
`section 215 and a despreading section 218.
`Despreading section 215 despreads the data component of
`the baseband signal and outputs the resulting signal to the
`adaptive demodulator 216. The adaptive demodulator 216
`demodulates the output signal from despreading section 215
`in accordance with the directions of the communication
`mode determination section 201, and outputs the resulting
`signal to the adaptive decoding section 217. The adaptive
`decoding section 217 decodes the output signal from the
`adaptive demodulator 216 in accordance with the directions
`of the communication mode determination section 201, and
`obtains receive data.
`Despreading section 218 despreads the pilot signal com
`ponent of the baseband signal and outputs the resulting
`signal to a CIR measurement section 219. The CIR mea
`surement section 219 measures the CIR of the pilot signal
`output from despreading section 218, and outputs the result
`to the communication mode determination section 201.
`Next, the procedure for transmission/reception of signals
`between the base station shown in FIG. 2 and the commu
`nication terminal shown in FIG. 3 will be described.
`First, at the start of communication, a pilot signal is
`modulated by the modulator 106 in the base station, is
`spread by spreading section 107, and is output to the
`multiplexer 108. Only the spread pilot signal is output from
`the multiplexer 108 to the transmit RF section 109. The
`spread pilot signal is frequency-converted to radio frequency
`by the transmit RF section 109, and transmitted to commu
`nication terminals as a radio signal from the antenna 111 via
`the duplexer 110.
`A radio signal of only the pilot signal component trans
`mitted as a radio signal from the base station is received by
`the antenna 213 of the communication terminal, passes
`through the duplexer 212, and is frequency-converted to
`baseband by the receive RF section 214. The pilot signal
`component of the baseband signal is despread by despread
`ing section 218, and output to the CIR measurement section
`219.
`Next, in the CIR measurement section 219, the CIR of the
`pilot signal output from despreading section 218 is mea
`Sured, and based on the CIR, the communication mode is
`determined by the communication mode determination sec
`tion 201. Then a DRC signal with a number corresponding
`to the communication mode is created by the DRC signal
`creation section 202.
`The DRC signal is modulated by modulator 203, spread
`by spreading section 204, and output to the DRC power
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`controller 205. In the DRC power controller 205, the DRC
`signal transmission power is controlled based on the trans
`mission power of the pilot signal output from the pilot power
`controller 209, and the ratios of pilot signal transmission
`power to DRC signal transmission power set beforehand in
`the transmission power table 206.
`The contents set in the transmission power table 206 will
`be described below. FIG. 4 is a drawing showing the
`contents of the transmission power table provided in a
`communicat