(19) United States
`(12) Patent Application Publication (10) Pub. No.: US 2001/0014612 A1
`UESUG
`(43) Pub. Date:
`Aug. 16, 2001
`
`US 20010014612A1
`
`(54) TRANSMISSION POWER CONTROL
`METHOD AND TRANSMISSION/RECEPTION
`APPARATUS
`
`(75) Inventor: MESSESS,
`-SHI (JP)
`Correspondence Address:
`GREENBLUM & BERNSTEIN
`1941 ROLAND CLARKE PLACE
`RESTON, VA 20191
`
`(*)
`
`Notice:
`
`(73) Assignee: MATSUSHITA ELECTRIC INDUS-
`TRIAL CO.,LTD., OSAKA (JP)
`This is a publication of a continued pros-
`ecution application (CPA) filed under 37
`CFR 1.53(d).
`(21) Appl. No.:
`09/185,507
`
`(22) Filed:
`
`Nov. 4, 1998
`
`(30)
`
`Foreign Application Priority Data
`
`Nov. 13, 1997 (JP)............................................. 9-329.559
`
`Publication Classification
`(51) Int. Cl." ....................................................... H04B 7/00
`(52) U.S. Cl. ............................. 455/522; 370/342; 455/69
`(57)
`ABSTRACT
`Slot quality detector 121 detects a reception level, and power
`controller inversely corresponding to reception quality 122
`outputs power control information indicative of increasing
`transmission power in the case where the detected reception
`level is higher than a threshold value and of decreasing the
`transmission power in the case where the detected quality is
`lower than the threshold value. Transmission power setter
`108 performs the setting of transmission power correspond
`ing to the power control information and provides a control
`to transmit by the Set power. That allows improving of a
`battery Saving and moderating of the Specification of ampli
`fiers in a transmission/reception apparatus, thereby resulting
`in decreased interference to Signals of other users in the
`CDMA communication.
`
`
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`RECEIVEDDATA
`
`AVERAGED
`RECEPTION
`POWER
`CALCULATOR
`
`POWER CONTROLLERINVERSELY
`CORRESPONDINGTO RECEPTION
`QUALITY
`
`
`
`SLOTQUALITY
`DETECTOR
`
`122
`
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`Patent Application Publication Aug. 16, 2001 Sheet 1 of 9
`
`US 2001/0014612 A1
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`

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`Patent Application Publication Aug. 16, 2001 Sheet 2 of 9
`
`US 2001/0014612 A1
`
`FIG. 2
`
`STARTPOWER CONTROL CORRESPONDING
`TO RECEPTIONQUALITY
`
`ST
`
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`SLOT QUALITY
`THRESHOLD WALUE
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`ST4
`
`TRANSMISSION OF POWER
`CONTROLINFORMATION
`
`FINISHPOWER CONTROL CORRESPONDING
`TO RECEPTIONQUALITY
`
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`

`

`Patent Application Publication Aug. 16, 2001 Sheet 3 of 9
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`US 2001/0014612 A1
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`

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`Patent Application Publication
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`IPR2018-01474
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`

`

`Patent Application Publication Aug. 16, 2001 Sheet 5 of 9
`
`US 2001/0014612 A1
`
`FIG. 5
`
`STARTPOWER CONTROLINVERSELY
`CORRESPONDING TO RECEPTIONQUALITY
`
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`THRESHOLD WALUE
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`OF TRANSMISSION POWER
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`CONTROL-DECREASE
`OF TRANSMISSION POWER
`
`ST104
`
`TRANSMISSION OF POWER
`CONTROLINFORMATION
`
`
`
`
`
`FINISHPOWER CONTROLINVERSELY
`CORRESPONDING TO RECEPTIONQUALITY
`
`IPR2018-01474
`Apple Inc. EX1011 Page 6
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`

`

`Patent Application Publication Aug. 16, 2001 Sheet 6 of 9
`
`US 2001/0014612 A1
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`IPR2018-01474
`Apple Inc. EX1011 Page 7
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`

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`Patent Application Publication Aug. 16, 2001 Sheet 7 of 9
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`US 2001/0014612 A1
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`IPR2018-01474
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`

`

`Patent Application Publication Aug. 16, 2001 Sheet 8 of 9
`
`US 2001/0014612 A1
`
`FIG. 8
`
`STARTPOWER CONTROLINVERSELY
`CORRESPONDING TO RECEPTION QUALITY
`
`ST201
`
`UPDATE THRESHOLD WALUE
`CORRESPONDING TO
`CALCULATION RESULT OF
`AVERAGED RECEPTION POWER
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`OF TRANSMISSION POWER
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`OF TRANSMISSION POWER
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`ST205 TRANSMISSION OF POWER
`CONTROLINFORMATION
`
`FINISHPOWER CONTROLINVERSELY
`CORRESPONDING TO RECEPTIONQUALITY
`
`IPR2018-01474
`Apple Inc. EX1011 Page 9
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`

`

`Patent Application Publication Aug. 16, 2001 Sheet 9 0f 9
`
`US 2001/0014612 A1
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`Apple Inc. EX1011 Page 10
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`IPR2018-01474
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`

`

`US 2001/0014612 A1
`
`Aug. 16, 2001
`
`TRANSMISSION POWER CONTROL METHOD
`AND TRANSMISSION/RECEPTION APPARATUS
`
`BACKGROUND OF THE INVENTION
`0001) 1. Field of the Invention
`0002 The present invention relates to a transmission
`power control method and a transmission/reception appara
`tus, which are used in a CDMA (Code Division Multiple
`Access) that is a digital radio communication and So on,
`capable of controlling transmission power optimally for a
`battery Saving in a mobile Station apparatus and So on.
`0003 2. Description of the Related Art
`0004.
`In a conventional transmission/reception apparatus
`using a transmission power control, the transmission power
`is controlled to be increased in the case where a reception
`quality decreases by a decrease of a reception level due to
`fading, or the like, and to be decreased in the case of a good
`reception quality.
`0005 FIG. 1 is a block diagram illustrating a schematic
`configuration of a conventional CDMA transmission/recep
`tion apparatus. In FIG. 1, transmission data 1 is Subjected to
`error correction coding in error correction coder 2, and
`interleaved in interleaver 3. Then the data is spread with a
`predetermined spreading code in spreader 4, demodulated in
`demodulator 5, amplified in transmission amplifier 6, and
`transmitted from transmission antenna 7.
`0006. At this time, transmission amplifier 6 amplifies the
`transmission power to the level set by transmission power
`setter 8. This example illustrates an example of diversity
`reception. Therefore, in a receiver, Signals are received in
`first reception antenna 11 and in Second reception antenna
`12, detected in first detector 13 and in second detector 14
`respectively, despread in first despreader 15 and in Second
`despreader 16 respectively, then Synthesized in Synthesizer
`17.
`0007. In the case where a plurality of paths present in a
`communication link due to the effect of delayed versions and
`so on, RAKE combining is also performed in synthesizer 17.
`The synthesized data are deinterleaved in deinterleaver 18,
`subjedted to error correction in error correction decoder 19
`to obtain reception data 20.
`0008. In the receiver, slot quality detector 21 detects a
`slot quality of reception data 20. In detail, at step ST1 of a
`flow chart illustrated in FIG. 2, the quality of the slot (a
`block of data with a certain length) is detected. At this step,
`as illustrated in FIG. 3, it is decided whether or not the slot
`quality (reception quality)31 is higher than threshold value
`32.
`0009 Based on the decision result, power controller
`corresponding to reception quality 22 (hereinafter abbrevi
`ated as power controller-CRO 22) controls the transmission
`power to be decreased at Step ST2 in the case where
`reception quality (reception level) 31 is higher (better) than
`threshold value 32. On the other hand, power controller
`CRQ 22 controls the transmission power to be increased at
`step ST3 in the case where the reception quality is lower
`than the threshold value. In detail, power controller-CRO 22
`provides a control as illustrated by rectangle line 34 in FIG.
`3. Then, at step ST4, transmits power control information is
`transmitted to transmission power Setter 8 in a transmitter.
`
`0010 FIG. 3 is a diagram illustrating the control of
`power controller-CRO 22 for reverse link signals (signals
`transmitted from mobile station MS to base station BS). In
`FIG. 3, the fading between transmission side MS and
`reception side BS illustrated by curve 36 and the transmis
`sion power of mobile side MS illustrated by curve 38 are
`almost in inverse proportion.
`0011 Thus, it is possible to keep the reception quality
`almost constant, thereby allowing the improvement of the
`error correction ability in the case of using the error correc
`tion code having high resistance to random errors, Such as
`convolutional code. However, there is a factor that a trans
`mission power control error or interference Volume changes,
`interleaving are performed to make errors further random.
`0012. According to the manner described above, the
`transmission power control corresponding to the reception
`quality always allows using of the minimum level of trans
`mission power needed to keep the quality constant, thereby
`resulting in a battery Saving of the mobile Station. In
`addition, that also allows improving of System capacity
`because the interference Volume is decreased by Suppressing
`an unnecessary transmission power in the CDMA commu
`nication System.
`0013 However, in the conventional reception/transmis
`Sion apparatus descried above, the transmission power is
`controlled to be increased in the case where the reception
`quality decreases by the decrease of the reception level due
`to the fading, or the like, and to be decreased in the case of
`the good communication quality. In the case where the
`reception level decreases due to the fading, it is necessary to
`increase the transmission level to tens of dB to transmit,
`which requires a transmission amplifier to have a large
`dynamic range. However, especially in the mobile Station,
`the requirements for a battery life and Specification on
`amplifiers have become severe, which makes it difficult to
`use an amplifier with the large dynamic range. In addition,
`the increase of the level makes the instant interference (to
`Signals of other users) high in the CDMA communication.
`
`SUMMARY OF THE INVENTION
`0014. The object of the present invention is to provide a
`transmission power control method and a transmission/
`reception apparatus capable of Satisfying Severe require
`ments for a batter life and Specification on amplifiers, and of
`decreasing interference to Signals of other users in a CDMA
`communication.
`0015 The present inventor was interested in the fact that
`an increase of transmission power did not improve an
`quality to an expected degree when a power level was
`decreased depending on level variations due to fading, and
`found the fact that an exceSS increase of the transmission
`power can be prevented by decreasing the transmission
`power to abandon Such portion of communications in the
`case of level variations due to the fading, thus resulting in
`the present invention.
`0016 That is, the principle of the present invention is as
`follows. The transmission/reception apparatus in the recep
`tion Side detects the reception level and provides the power
`control to the transmission Side to increase the transmission
`power in the case where the detected reception level is
`higher than a threshold value, and decrease the transmission
`
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`US 2001/0014612 A1
`
`Aug. 16, 2001
`
`power in the case where the detected reception level is lower
`than the threshold value, and the transmission side thus
`performs a transmission by the power according to the
`power control.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`0017 FIG. 1 is a block diagram of a conventional CDMA
`transmission/reception apparatus,
`0.018
`FIG. 2 is a flow chart to explain an operation of the
`conventional CDMA transmission/reception apparatus,
`0.019
`FIG. 3 is a diagram to explain a power control
`corresponding to reception quality in the conventional
`CDMA transmission/reception apparatus,
`0020 FIG. 4 is a block diagram of a CDMA transmis
`Sion/reception apparatus according to the first embodiment
`of the present invention;
`0021
`FIG. 5 is a flow chart to explain an operation of the
`CDMA transmission/reception apparatus according to the
`above embodiment;
`0022 FIG. 6 is a diagram to explain a power control
`inversely corresponding to reception quality in the CDMA
`transmission/reception apparatus according to the above
`embodiment;
`0023 FIG. 7 is a block diagram of a CDMA transmis
`Sion/reception apparatus according to the Second embodi
`ment of the present invention;
`0024 FIG. 8 is a flow chart to explain an operation of the
`CDMA transmission/reception apparatus according to the
`above embodiment; and
`0025 FIG. 9 is a block diagram of a CDMA transmis
`Sion/reception apparatus according to the third embodiment
`of the present invention.
`
`DETAILED DESCRIPTION OF THE
`PREFERRED EMBODIMENTS
`0026. In a transmission power control method of the
`present invention, a transmission/reception apparatus in a
`reception side detects a reception level, and provides a
`power control to the transmission Side to increase the
`transmission power in the case where the detected reception
`level is higher than a threshold value, and decrease the
`transmission power in the case where the detected reception
`level is lower than the threshold value, and the transmission
`Side thus performs a transmission by the power according to
`the power control.
`0.027 According to this method, since the transmission
`power control inversely corresponding to the reception
`quality is performed, an averaged transmission power can be
`decreased, thereby resulting in more battery Saving of the
`transmission/reception apparatus than conventional appara
`tuses and the Suppressed peak transmission power. That
`allows moderating of the Specification of amplifiers, espe
`cially allows reducing of a cost and power consumption of
`the transmission/reception apparatus.
`0028. In addition, in this transmission power control
`method, it is preferable in the reception side to calculate a
`long-term reception power average and determine the
`threshold value corresponding to the calculation result. By
`
`this manner, it is possible to obtain the same effect as the
`manner described above, and prevents the transmission
`power from decreasing according to an attenuation due to a
`long-term variation, by reflecting the calculation result of
`the averaged reception power.
`0029. In addition, in this transmission power control
`method, it is preferable in the transmission Side to calculate
`an average of transmission power control information and
`determine the transmission power corresponding to the
`calculation result. By this manner, it is possible to obtain the
`Same effect as the manner described above, and perform
`further effective transmission power control by calculating
`the averaged transmission power.
`0030. In addition, the transmission/reception apparatus of
`the present invention comprises a receiver having a recep
`tion quality detecting Section for detecting the reception
`quality and a power control inversely corresponding to
`reception quality Section for outputting power control infor
`mation of increasing the transmission power in the case
`where the detected reception level is higher than the thresh
`old value and decreasing the transmission power in the case
`where the reception level is lower than the threshold value,
`and also comprises a transmitter having a transmission
`power Setting Section for Setting the transmission power
`corresponding to the power control information and provid
`ing a control to transmit according to the Set power.
`0031. According to the constitution, since the transmis
`Sion power control inversely corresponding to reception
`quality is performed, the averaged transmission power can
`be decreased, thereby resulting in more battery Saving of the
`transmission/reception apparatus than conventional appara
`tuses and the Suppressed peak transmission power. That
`allows moderating of the Specification of amplifiers, espe
`cially allows reducing of a cost and power consumption of
`the transmission/reception apparatus.
`0032. In addition, in this transmission/reception appara
`tus, the receiver comprises an averaged reception power
`calculating Section for calculating the long-term reception
`power average, and the power control inversely correspond
`ing to reception quality Section determines the threshold
`value corresponding to the calculation result.
`0033 According to this manner, it is possible to obtain
`the same effect as the manner described above, and prevents
`the transmission power from decreasing according to the
`attenuation due to the long-term variation, by reflecting the
`calculation result of the averaged reception power.
`0034.
`In addition, in the transmission/reception appara
`tus, the transmitter comprises an averaged transmission
`power calculating Section for obtaining an average of the
`power control information, and the transmission power
`Setting Section determines the transmission power corre
`sponding to the calculation result. According to the consti
`tution, it is possible to obtain the same effect as the manner
`described above, and perform further effective transmission
`power control by calculating the averaged transmission
`power.
`0035) In addition, it is preferable in the transmission/
`reception apparatus that the transmitter and the receiver
`comprise the constitutions to perform the CDMA commu
`nication. According to the constitution, in the CDMA com
`munication, it is possible to improve the System capacity
`
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`US 2001/0014612 A1
`
`Aug. 16, 2001
`
`more than the conventional constitution because the
`decrease of the averaged transmission power results in the
`decrease of interference Volume.
`0.036
`Hereinafter, the embodiments of the present inven
`tion are explained with reference to attached drawings in
`detail.
`0037 First Embodiment
`0038 FIG. 4 illustrates a block diagram of a CDMA
`transmission/reception apparatus in the first embodiment of
`the present invention. In FIG. 4, transmission data 101 is
`Subjected to error correction coding in error correction coder
`102, and interleaved in interleaver 103. Then the data are
`Spread with a spreading code in Spreader 104, demodulated
`in demodulator 105, amplified in transmissions amplifier
`106, and transmitted from transmission antenna 107.
`0039. At this time, transmission amplifier 106 amplifies
`the transmission power to the level Set by transmission
`power setter 108. This example illustrates an example of
`diversity reception. Therefore, in a receiver, Signals are
`received in first reception antenna 111 and in Second recep
`tion antenna 112, detected in first detector 113 and in second
`detector 114 respectively, despread in first despreader 115
`and in Second despreader 116 respectively, then Synthesized
`in synthesizer 17.
`0040. In the case where a plurality of paths present in a
`communication link due to the effect of delayed versions and
`So on, RAKE combining is also performed in Synthesizer
`117. The synthesized data are deinterleaved in deinterleaver
`118, Subjedited to error correction in error correction decoder
`119 to obtain reception data 120.
`0041. In the receiver, slot quality detector 121 detects a
`slot quality of reception data 120. In detail, at step ST101 of
`a flow chart illustrated in FIG. 5, the quality of the slot (a
`block of data with a certain length) is detected. At this step,
`it is decided whether or not the slot quality (reception
`quality) 201 is higher than threshold value 202.
`0.042
`Based on the decision result, power control
`inversely corresponding to reception quality Section 122
`(hereinafter abbreviated as power control-ICRO 122) gen
`erates the power control information So as to increase the
`transmission power at Step ST2 as illustrated by rectangle
`line 204 in FIG. 6 in the case where reception quality
`(reception level) 201 is higher (better) than threshold value
`202 and to decrease the transmission power at step ST103 in
`the case where the reception quality is lower than threshold
`value 202. Then at step ST104, the power control informa
`tion is transmitted to transmission power setter 108 in the
`transmitter.
`0.043 A logic diagram of power control-ICRO section
`122 illustrated in FIG. 6 shows an example of reverse link
`Signals (signals transmitted from mobile Station MS to base
`station BS). The transmission power in mobile side MS
`illustrated by curve 208 indicates almost similar variations
`with the fading between transmission side MS and reception
`side BS illustrated by curve 206.
`0044) Two kinds of reception qualities thus are available,
`i.e., extremely good reception quality and extremely poor
`reception quality. In the case of using the error correction
`code having high resistance to random errors, Such as
`
`convolutional code, the correction ability is hold by inter
`leaving to make errors random.
`0045 When the transmission power control illustrated in
`FIG. 6 is performed, it is not necessary to transmit by high
`power in the case where the reception level more than a
`certain level is kept by the level variation due to fading.
`Therefore, transmission power setter 108 controls the trans
`mission power (under a certain power level) not to transmit
`in the receiver by higher power than a certain power level
`after the power level reaches the certain power level even in
`the case where power control-ICRO section 122 instructs to
`increase the transmission power.
`0046) The maximum MS transmission power thus is
`controlled under the power level that is too high. On the
`other hand, in the case where the level is under the certain
`level by the level variation due to fading (the level variation
`due to fading is under the certain level) it is not reasonable
`to transmit by compulsory high transmission power because
`good enough quality may not be obtained. In Such case, the
`transmission power is decreased to abandon Such poor
`quality, thereby reducing the transmission power.
`0047. In this case, error correction decoder 119 extremely
`lowers the likelihood of soft decision decoding. The case of
`performing the error correction and interleaving is equiva
`lent to the case of puncture, and a correct demodulation is
`performed in the case of a low degree of the error correction
`and the interleaving. Thus, by Setting in transmission power
`setter 108 the transmission power with the transmission
`power value controlled by power controller-ICRO 122, the
`averaged transmission power and the peak transmission
`power is reduced.
`0048. In a transmission of packets and so on, the packet
`that could not be transmitted is retransmitted. It is Supposed
`that the effect of decreasing the entire transmission power is
`more effective than the effect of increasing the transmission
`power to retransmit, and also Supposed that FER (Frame
`Error Rate) is less than random errors by not performing the
`interleaving.
`0049. Thus, according to the first embodiment, since the
`transmission power control inversely corresponding to
`reception quality is performed along with interleaving, error
`correction and So on, the averaged transmission power can
`be reduced. Therefore, the battery saving of the mobile
`Station is achieved more than the conventional apparatuses
`and the peak transmission power is Suppressed. That allows
`moderating of the Specification of amplifiers, further reduc
`ing of the cost and power consumption of the transmission/
`reception apparatus. In addition, it is possible to improve the
`System capacity more than the conventional constitution
`because the decrease of the averaged transmission power
`results in the decrease of interference (volume) in the
`CDMA system.
`0050 Second Embodiment
`0051 FIG. 7 illustrates a block diagram of a CDMA
`transmission/reception apparatus according to the Second
`embodiment of the present invention. In addition, in the
`Second embodiment of the present invention illustrated in
`FIG. 7, a Section corresponding to each Section in the first
`embodiment illustrated in FIG. 4 is assigned the same
`Symbol to omit the explanation.
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`US 2001/0014612 A1
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`Aug. 16, 2001
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`0052. The second embodiment illustrated in FIG. 7 is
`characterized by having averaged reception power calcula
`tor 301 for calculating a long-term variations of the recep
`tion level caused by an attenuation of communication dis
`tance to be reflected in a threshold value in power controller
`ICRO 302 so that the appropriate transmission power
`control is performed.
`0053) That is, in the receiver, at step ST201 illustrated in
`the operation flow chart of the power control inversely
`corresponding to reception quality in FIG. 8, averaged
`reception power calculator 301 calculates, using data output
`from Synthesizer 117, the long-term variations of the recep
`tion level caused by the attenuation of communication
`distance and So on, and updates the threshold value of power
`controller-ICRO 122 corresponding to the calculation result.
`The update is performed to increase the threshold value
`when the calculation value is high, which is assumed that the
`attenuation is low, and to decrease the threshold value when
`the calculation value is low.
`0.054 Then, slot quality detector 121 detects a slot quality
`based on reception data 120 at step ST202, and decides
`whether or not the slot quality is higher than the threshold
`value.
`Based on the decision result, power controller
`0.055
`ICRO 122 generates the power control information indica
`tive of increasing the transmission power at step ST203 in
`the case where the reception quality is higher (better) than
`the threshold value, and of decreasing the transmission
`power at step ST204 in the case where the reception quality
`is lower than the threshold value. Then, at step ST205, the
`power control information is transmitted to transmission
`power setter 108 in the transmitter.
`0056. When a cell radius is large, it is supposed that the
`long-term level variation generates by a difference of com
`munication distance and Shadowing. In Such case, the trans
`mission power decreaseS as the attenuation of the long-term
`variation if the threshold value of power controller-ICRO
`122 is fixed in the same way as the first embodiment.
`0057. However, the above problem that the transmission
`power decreases as the attenuation of the long-term variation
`is Solved in the same way as the Second embodiment, where
`averaged reception power calculator 301 obtains the long
`term averaged reception level to update the threshold value.
`The more effective transmission control than the first
`embodiment is thus performed.
`0.058 As described above, according to the second
`embodiment, it is possible to obtain the same effect as the
`first embodiment, and also cancel the effect of decreasing the
`transmission power as the attenuation of the long-term
`variation by reflecting the calculation result of the averaged
`reception power.
`0059) Third Embodiment
`0060 FIG. 9 illustrating a block diagram of a CDMA
`transmission/reception apparatus according to the third
`embodiment of the present invention. In addition, in the
`third embodiment of the present invention illustrated in
`FIG. 9, a Section corresponding to each Section in the
`second embodiment illustrated in FIG. 7 is assigned the
`Same Symbol to omit the explanation.
`
`0061 The third embodiment illustrated in FIG. 9 is
`characterized by having averaged transmission power cal
`culator 401 for deciding an averaged transmission power not
`to incline the control corresponding to the power control
`information from power controller-ICRO 122 to transmit to
`transmission power setter 108 so that the upper limit of the
`transmission power is decided.
`0062) That is, in the receiver, slot quality detector 121
`detects a slot quality of reception data 120. According to the
`result, power controller-ICRO 122 generates the power
`control information indicative of increasing the transmission
`power in the case where the reception quality is higher
`(better) than a threshold value, and of decreasing the trans
`mission power in the case where the reception quality is
`lower than the threshold value, and transmits the power
`control information to transmission power setter 108 and
`averaged transmission power calculator 401 in the transmit
`ter.
`0063 Thus, averaged transmission power calculator 401
`decides the averaged transmission power not to incline the
`control from power controller-ICRO 122 to transmit to
`transmission power setter 108, thereby deciding the upper
`limit of the transmission power.
`0064. That is, in the transmitter, averaged transmission
`power calculator 401 detects the incline of the control from
`power controller-ICRO 122, then increases the upper limit
`of the transmission power of transmission power setter 108
`by deciding that the communication distance is getting
`bigger in the case of (inclining to increase the power) the
`continuous controls indicative of increasing the power level
`from power controller-ICRO 122, and decreases the upper
`limit of the transmission power of transmission power Setter
`108 by deciding that the communication distance is getting
`Smaller in the case of (inclining to decrease the power) the
`continuous controls indicative of decreasing the power level
`from power controller-ICRO 122. The more effective trans
`mission power control is thus performed than the Second
`embodiment.
`0065. As described above, according to the third embodi
`ment, it is possible to obtain the same effect as the Second
`embodiment, and to perform further effective transmission
`power control than the Second embodiment by calculating
`the averaged transmission power.
`0066. The apparatuses according to the first embodiment
`to the third embodiment described above are applicable to
`communication terminal apparatuses as mobile Station appa
`ratuses and base Station apparatuses in a radio communica
`tion system. In addition, the first embodiment to the third
`embodiment described above explain about the case of
`applying the transmission/reception apparatus of the present
`invention in the CDMA communication system, however
`the transmission/reception apparatus of the present inven
`tion is applicable to the other communications besides the
`CDMA. In addition, the first embodiment to the third
`embodiment described above explain about the case of using
`the reception level as the reception quality, however in the
`present invention, SNR (Signal to Noise ratio), CNR (Car
`rier to Noise ratio), SIR (Signal to Interference ratio), FER
`(Frame Error Rate), BER (Bit Error Rate), etc. are applicable
`as the reception quality.
`0067. As appeared in the above-mentioned explanation, it
`is possible in the reception/transmission apparatus to
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`US 2001/0014612 A1
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`Aug. 16, 2001
`
`improve the battery life and moderate the Specification on
`amplifiers, thereby decreasing interference to Signals of
`other users in the CDMA communication.
`What is claimed is:
`1. A transmission power control method comprising the
`Steps of:
`detecting a quality of a received Signal;
`generating power control information indicat