`Case 2:20-cv-00322-JRG Document 1—4 Filed 10/01/20 Page 1 of 19 PageID #: 84
`
`EXHIBIT D
`
`EXHIBIT D
`
`
`
`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 2 of 19 PageID #: 85
`cas”:2°'cv'°°322'JRG D°°“me“t 1"‘lllfllllll‘fllfilllIllll'flflllllFl‘llflllllzllllIllflllifillllllllIIIHIIT‘E’
`
`USOO7006463B2
`
`(12) United States Patent
`Us 7,006,463 B2
`(10) Patent N0.:
`Tsunehara et al.
`*Feb. 28, 2006
`(45) Date of Patent:
`
`(54) CDMA COMMUNICATION SYSTEM AND
`ITS TRANSMISSION POWER CONTROL
`METHOD
`
`(56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`
`(75)
`
`Inventors: Katsuhiko Tsunehara, Yokohama (JP);
`Takashi Yano, Tokorozawa (JP);
`Nobukazu D0i, Hachioji (JP); Takaki
`Uta, Yokohama (JP); Keiji Hasegawa,
`Higashimurayama (JP)
`
`(73) Assignee:
`
`Hitachi, Ltd., Tokyo (JP)
`
`(*)
`
`Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`
`This patent is subject to a terminal dis-
`claimer.
`
`(21)
`
`Appl. No.: 10/262,935
`
`(22)
`
`Filed:
`
`Oct. 3, 2002
`
`Prior Publication Data
`
`US 2003/0053426 A1
`
`Mar. 20, 2003
`
`Continuation of application No. 09/818,510, filed on
`Mar. 28, 2001, now Pat. No. 6,483,816, which is a
`continuation of application No. 08/985,281, filed on
`Dec. 4, 1997, now Pat. No. 6,307,844.
`
`(30)
`Dec. 6, 1996
`
`Foreign Application Priority Data
`
`(JP)
`
`................................. 08-326493
`
`(51)
`
`Int. Cl.
`(2006.01)
`H04B 7/185
`(2006.01)
`H04B 7/216
`(52) US. Cl.
`......................... 370/318; 370/335; 455/69
`(58) Field of Classification Search ................ 370/310,
`370/318, 320, 322, 332, 335, 342; 455/68—70,
`455/115, 432, 522
`See application file for complete search history.
`
`(65)
`
`(63)
`
`5,535,238 A *
`5,559,790 A
`5,604,730 A
`5,621,723 A
`5,623,486 A *
`5,673,259 A
`
`7/1996 Schilling et al.
`............ 375/142
`
`9/1996 Yano et a1.
`...... 370/342
`2/1997 Tiedemann, Jr.
`............ 370/252
`4/1997 Walton, Jr. et al.
`......... 370/335
`4/1997 Dohi et al.
`................. 370/342
`9/1997 Quick, Jr.
`................... 370/342
`
`(Continued)
`FOREIGN PATENT DOCUMENTS
`
`JP
`
`04-040024
`
`2/1992
`
`(Continued)
`OTHER PUBLICATIONS
`
`“Development on CDMA Packet Mobile Communication
`System,” by Yano et al, Communication Society Meeting,
`Institute of Electronics, Information and Communication
`Engineers, B-389 (1996).
`
`Primary Examiner—John Pezzlo
`Assistant Examiner—Saba Tsegaye
`(74)Att0mey, Agent, or Firm—Mattingly, Stanger, Malur &
`Brundidge, PC.
`
`An uplink channel transmission power control method is
`provided for a CDMA mobile communication system per-
`forming one way communication. A base station measures
`the received level of data transmitted from each mobile
`
`terminal at each channel, and generates a transmission
`power control signal of each uplink traffic channel. The
`generated transmission power control signals are multi-
`plexed, and the multiplexed common transmission power
`control signal is transmitted to all mobile terminals by using
`the common channel shared by the mobile terminals. Each
`mobile terminal derives the transmission power control
`signal of the uplink traffic channel used by the terminal, from
`the received common transmission power control signal, and
`controls the transmission power of a data packet.
`
`18 Claims, 10 Drawing Sheets
`
`Related US. Application Data
`
`(57)
`
`ABSTRACT
`
`
`
`
`
`
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`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 3 of 19 PageID #: 86
`Case 2:20-cv-00322-JRG Document 1—4 Filed 10/01/20 Page 3 of 19 PageID #: 86
`
`US 7,006,463 132
`
`Page 2
`
`US. PATENT DOCUMENTS
`
`6,195,046 B1
`
`2/2001 Gilhousen ................... 342/457
`
`1/1998 Hulbert
`455/69
`5 713 074 A
`7/1998 Ietal.
`....................... 370/252
`5,784,360 A
` 8/1998 Komatsu ..
`
`455/69
`5,794,129 A
`8/1998 Soliman ..................... 370/335
`5,799,005 A
`9/1998 Gilhousen et al.
`............ 455/69
`5,812,938 A
`10/1998 Raith et al.
`........
`370/345
`5,818,829 A
`
`10/1998 Jalali et al.
`.....
`370/335
`5,828,662 A
`
`
`5,835,527 A * 11/1998 Lomp
`375/142
`5,991,627 A
`11/1999 Honkasalo et al.
`455/437
`
`5,995,496 A
`11/1999 Honkasalo et al.
`370/318
`
`6,047,015 A *
`4/2000 Watanabe et al.
`........... 375/132
`
`............ 375/142
`5/2001 Schilling et al.
`6,226,316 B1
`7/2001 Esmaflzadeh ““““““““ 375/143
`6’259’724 131*
`FOREIGN PATENT DOCUMENTS
`
`JP
`JP
`WO
`WO
`
`04—502841
`08—125604
`95/31879
`96/03813
`
`5/1992
`5/1996
`11/1995
`2/1996
`
`* cited by examiner
`
`
`
`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 4 of 19 PageID #: 87
`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 4 of 19 PageID #: 87
`
`US. Patent
`
`Feb. 28, 2006
`
`Sheet 1 0f 10
`
`US 7,006,463 B2
`
`F l G.
`
`I
`
`PRIOR ART
`
`200
`
`MOBILE
`
`COMMUNICATION
`
`NETWORK
`
`
`
`
`204a \J‘IEI
`
`lg¢204b
`MOBILE TERMINAL
`
`MOBILE TERMINAL
`
`
`
`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 5 of 19 PageID #: 88
`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 5 Of 19 PageID #: 88
`
`US. Patent
`
`Feb. 28, 2006
`
`Sheet 2 0f 10
`
`US 7,006,463 B2
`
`FIG. 2
`
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`PM” CHANNEL
`
`9
`
`(BASE STATION-MOBILE TERMINAL)
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`
`ANSWER CHANNEL
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`
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`
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`(MOBILE TERMINALaBASE STATION)
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`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 6 of 19 PageID #: 89
`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 6 of 19 PageID #: 89
`
`US. Patent
`
`Feb. 28, 2006
`
`Sheet 3 0f 10
`
`US 7,006,463 B2
`
`FIG. 3
`
`V
`
`35
`
`36
`
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`
`
`
`52
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`
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`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 9 of 19 PageID #: 92
`
`US. Patent
`
`Feb. 28, 2006
`
`Sheet 6 0f 10
`
`US 7,006,463 B2
`
`FIG. 8
`
`60
`
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`
`61
`
`62
`
`120
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`121
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`
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`DESPREAD CIRCUIT
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`
`63
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`ANSWER CHANNEL 123
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`DETECTOR
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`
`RECEIVED
`
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`
`64
`
`65
`
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`
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`
`
`
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`
`RECEIVED
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`
`TRANSMISSION
`
`
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`POWER CORRECTION
`
`
`CHANNEL
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`UNIT
`
`
`
`
`150
`151
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`CALCULATOR 0F
`
`
`TRAFFIC
`MEASUREMENT UNIT
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`
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`
`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 10 of 19 PageID #: 93
`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 10 of 19 PageID #: 93
`
`US. Patent
`
`Feb. 28, 2006
`
`Sheet 7 0f 10
`
`US 7,006,463 B2
`
`I40
`
`I 42a
`
`I42b
`
`I42c
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`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 11 of 19 PageID #: 94
`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 11 of 19 PageID #: 94
`
`US. Patent
`
`Feb. 28, 2006
`
`Sheet 8 0f 10
`
`US 7,006,463 B2
`
`FIG. IO
`
`30
`
`v
`
`31
`
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`
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`RESERVATION CHANNEL
`MEASUREMENT UNIT
`
`
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`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 12 of 19 PageID #: 95
`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 12 of 19 PageID #: 95
`
`US. Patent
`
`Feb. 28, 2006
`
`Sheet 9 0f 10
`
`US 7,006,463 B2
`
`FIG.II
`
`60
`
`V 61
`
`RF
`
`ACOUISITION/
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`54
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`
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`
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`
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`CHANNEL GAIN
`
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`
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`
`150
`
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`
`68
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`
`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 13 of 19 PageID #: 96
`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 13 of 19 PageID #: 96
`
`US. Patent
`
`Feb. 28, 2006
`
`Sheet 10 0f 10
`
`US 7,006,463 B2
`
`F | G. I2
`
`PRIOR ART
`
`1 303
`
`1323
`
`1 32b
`
`1 320
`
`
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`MOBILE TERMINAL 2-SBASE STATION
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`130n
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`BASE STATION-'MOBILE TERMINAL n
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`MOBILE TERMINAL n—*BASE STATION
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`DOWNLINK
`DOWNLINK
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`TRANSMISSION 5 TRANSMISSION
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`DATA
`2
`DATA
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`UPLINK TRANSMISSION DATA
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`:131n
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`TRANSMISSION POWER
`CONTROL SIGNAL
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`_, TRANSMISSION POWER
`CONTROL
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`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 14 of 19 PageID #: 97
`Case 2:20-cv-00322-JRG Document 1—4 Filed 10/01/20 Page 14 of 19 PageID #: 97
`
`US 7,006,463 B2
`
`1
`CDMA COMMUNICATION SYSTEM AND
`ITS TRANSMISSION POWER CONTROL
`METHOD
`
`This application is a continuation application of US. Ser.
`No. 09/818,510, filed Mar. 28, 2001, now US. Pat. No.
`6,483,816, which is a continuation application of US. Ser.
`No. 08/985,281, filed Dec. 4, 1997, now US. Pat. No.
`6,307,844.
`
`BACKGROUND OF THE INVENTION
`
`The present invention relates to a code division multiple
`access mobile communication system and its transmission
`power control method. More particularly, the present inven-
`tion relates to a packet communication system and its
`transmission power control method using reservation based
`access control.
`
`In a CDMA method, a plurality of mobile terminals share
`the same frequency band to communicate with a single base
`station. Therefore, for example, if mobile terminals A and B
`transmit modulated signal waves to the base station,
`the
`signal (not desired to be received) transmitted by the mobile
`terminal B interferes with the signal (desired to be received)
`transmitted by the mobile terminal A, and the communica-
`tion of the mobile terminal A with the base station is
`
`obstructed. The degree of interference depends on the
`received level of a signal (not desired to be received) at the
`base station. If the degree of interference becomes large to
`some level or more, communication between the mobile
`terminal and base station becomes impossible.
`If the transmission power of each mobile terminal can be
`controlled to always limit the signal level received at the
`base station to a minimum necessary reception power, it
`becomes possible to maximize the number of channels
`capable of being communicated by the base station. The
`more the transmission power shifts from the minimum
`necessary reception power, the less the number of channels
`capable of being communicated by the base station.
`As transmission power control
`techniques of CDMA
`mobile communication, an IS-95 transmission power control
`method is known described in TIA/EIA/IS-95 which is a
`standard system of digital cellar phones adopted in North
`America. The IS-95 transmission power control method will
`be described in the following.
`Since two way communication is essential for cellular
`phones, a pair of an uplink traffic channel and a downlink
`traffic channel is used for the communication between the
`
`base station and a mobile terminal. The uplink traffic chan-
`nel is a channel for transmitting data from a mobile terminal
`to the base station, and a downlink traffic channel
`is a
`channel for transmitting data from the base station to the
`mobile terminal.
`
`The base station measures the reception power of data
`transmitted from each mobile terminal and generates a
`transmission power control signal in accordance with the
`measured reception power. If the reception power of data is
`larger than a target reception power, the base station gener-
`ates a transmission power control signal “1” for this mobile
`station. Conversely if the reception power of data is smaller
`than the target reception power, the base station generates a
`transmission power control signal “0” for this mobile sta-
`tion. The generated transmission power control signal is
`inserted into data to be transmitted from the base station to
`a mobile terminal, and the transmission data with the trans-
`mission power control signal is transmitted to the mobile
`terminal. The mobile terminal controls to reduce the trans-
`
`2
`mission power if the received transmission power control
`signal is “1”, and to increase it if “0”.
`This transmission power control will be described spe-
`cifically with reference to FIG. 12. Each mobile terminal 1
`to n and the base station communicate with each other by
`using a pair of an uplink traffic channel and a downlink
`traffic channel. The upper row of each pair represents
`transmission data of the downlink traffic channel, and the
`lower row represents transmission data of the uplink traffic
`channel. The width of transmission data, particularly uplink
`transmission data, is drawn to correspond to a reception
`power of the uplink data at the base station.
`When the base station communicates with the mobile
`
`it inserts transmission power control signals
`terminal 1,
`132a, 132b, 132C, .
`.
`. into a downlink traffic channel 130a
`to the mobile terminal 1. The mobile terminal 1 changes its
`transmission power of the uplink transmission data in accor-
`dance with the transmission power control signal obtained
`from the received channel 130a. As above, the transmission
`power control of the mobile terminal 1 is performed by using
`the downlink traffic channel 130a. Similar transmission
`
`power control is performed also for other mobile terminals
`2 to n.
`
`SUMMARY OF THE INVENTION
`
`With advancement of mobile communication techniques,
`needs of not only a voice communication function (cellar
`phone) but also a data communication function are becom-
`ing large.
`For one way communication typical to data communica-
`tion, CDMA packet communication systems have been
`proposed from the viewpoint of efficiently using channels.
`One proposal of such CDMA packet communication sys-
`tems is described in “Development on CDMA Packet
`Mobile Communication System” by Yano, Uta, Hasegawa,
`and Doi, Communication Society Meeting, the Institute of
`Electronics,
`Information and Communication Engineers,
`B-389 (1996).
`Voice communication is two way communication using
`uplink and downlink traffic channels, whereas data commu-
`nication is one way communication using only one of uplink
`and downlink traffic channels. In such one way communi-
`cation, a conventional transmission power control method
`for cellar phones cannot be adopted because this method is
`established on the assumption that there is one pair of uplink
`and downlink traffic channels.
`
`If a paired downlink channel is provided only for the
`transmission power control of the uplink traffic channel, one
`downlink traffic channel is occupied by the transmission
`power control of only the uplink traffic channel. The use
`efficiency of traffic channels is lowered.
`To solve this problem, the invention provides a CDMA
`packet data communication system in which a base station
`controls the transmission power of each of a plurality of
`mobile terminals by using a single downlink traffic channel
`common for all mobile stations.
`The base station measures the received level of data
`transmitted from each mobile terminal at each channel, and
`generates a transmission power control signal of each chan-
`nel in accordance with the measured reception level. The
`generated transmission power control signals are collected
`together into a format predetermined for the system, and
`transmitted to all mobile terminals by using the common
`channel shared by the mobile terminals.
`Each mobile terminal derives the transmission power
`control signal of the uplink traffic channel used by the
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`Case 2:20-cv-00322-JRG Document 1—4 Filed 10/01/20 Page 15 of 19 PageID #: 98
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`US 7,006,463 B2
`
`3
`terminal, from the collected transmission power control
`signals transmitted from the base station, and transmits data
`at the transmission power changed in accordance with the
`derived transmission power control signal.
`These and other objects, features and advantages of the
`present invention will become more apparent in view of the
`following detailed description of the preferred embodiments
`in conjunction with accompanying drawings.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`FIG. 1 is a diagram showing the structure of a mobile
`communication network.
`
`FIG. 2 is a diagram illustrating a packet data communi-
`cation system using reservation based access control.
`FIG. 3 is a diagram showing a first example of the
`structure of a base station embodying transmission power
`control of the present invention.
`FIG. 4 is a diagram showing the structure of an answer
`packet.
`FIG. 5 is a diagram showing the structure of a unit for
`measuring a received level of a traffic channel.
`FIG. 6 is a diagram showing the structure of a unit for
`generating a transmission power control signal of a traffic
`channel.
`
`FIG. 7 is a diagram illustrating insertion of a transmission
`power control signal between answer packets.
`FIG. 8 is a diagram showing a first example of the
`structure of a mobile terminal embodying the transmission
`power control of the invention.
`FIG. 9 is a diagram illustrating a transmission power
`control state of an uplink traffic channel realized by the
`operations of a base station and mobile terminals according
`to the present invention.
`FIG. 10 is a diagram showing a second example of the
`structure of a base station embodying the transmission
`power control of the invention.
`FIG. 11 is a diagram showing a second example of the
`structure of a mobile terminal embodying the transmission
`power control of the invention.
`FIG. 12 is a diagram illustrating an uplink traffic channel
`transmission power control method of a conventional por-
`table telephone system.
`
`DETAILED DESCRIPTION OF THE
`PREFERRED EMBODIMENTS
`
`FIG. 1 shows the structure of a mobile communication
`
`network applied to the present invention. Apublic switched
`telephone network (PSTN) 200 is connected with a fixed
`terminal 201 such as a telephone and a mobile communi-
`cation network 202. The mobile communication network
`
`202 is connected with a plurality of base stations 203a,
`203b, .
`.
`. Each base station 203 communicates with mobile
`terminals 204a, 204b, .
`.
`. in its service area (cell) via radio
`channels 205.
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`In the following, the invention will be detailed by apply-
`ing it
`to a CDMA packet communication system using
`reservation based access control shown in FIG. 2.
`
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`In the CDMA packet communication system using reser-
`vation based access control, channels shared by a plurality
`of mobile terminals in the service area include a reservation
`
`channel 1 (uplink channel), an answer channel 2 (downlink
`channel) and a pilot channel 8 (downlink channel). The pilot
`channel 8 is a channel used for transmitting a pilot signal 9
`as a reference signal to each mobile terminal.
`
`4
`A mobile terminal having a data transmission request
`transmits a reservation packet 4 at a desired timing by using
`the reservation channel 1. The base station performs sched-
`uling of received reservation packets. The base station
`selects (schedules) a channel and a time slot (a time slot 7
`is defined in an uplink traffic channel 3) via which each
`mobile terminal can transmit data, from a plurality of uplink
`traffic channels 3. In order to transmit the scheduling results
`to each mobile terminal, the base station generates an answer
`packet 5 corresponding to the reservation packet. The gen-
`erated answer packet 5 is transmitted to the corresponding
`mobile terminal in the area by using the answer channel 2.
`The mobile terminal identifies the answer packet destined to
`it from received answer packets 5, and transmits a data
`packet by using the uplink traffic channel and time slot
`designated by the base station.
`the mobile terminal
`In the example shown in FIG. 2,
`transmitted the reservation packet 4a receives the answer
`packet 5a transmitted to it, selectively from answer packets
`transmitted from the base station, and transmits a data packet
`6a by using the time slot 7a of the traffic channel 3a
`designated in the received answer packet 5a.
`With reference to FIGS. 3 to 9, a first embodiment will be
`described which realizes a method of controlling the trans-
`mission power of an uplink channel.
`FIG. 3 shows an example of the structure of a base station.
`A signal received by an antenna 30 is input via a circulator
`31 to a reception radio module 32. The reception radio
`module 32 performs a high/middle frequency reception
`process to demodulate a signal in a carrier frequency band
`into a baseband signal. Since the received signal has a
`plurality of multiplexed channel signals, it is input to an
`acquisition/despread circuit (33, 42a—42n) to be spectrum
`despread.
`Areservation channel output from the reservation channel
`acquisition/despread circuit 33 is supplied via a signal line
`50 to a detector 35 whereat it is detected and then supplied
`to a decoder 36 whereat an error correction decode process
`such as Viterbi decoding is performed. A packet interpreta-
`tion unit 37 interprets the decoded reservation packet to
`obtain a terminal ID of the mobile terminal which transmit-
`
`ted the reservation packet and the reservation contents such
`as transmission data, and transfers the reservation contents
`to an answer packet generator unit 38.
`The reservation packet is also input via a signal line 51 to
`a unit 39 for measuring the received level of the reservation
`channel. This unit 39 measures a signal to noise power ratio
`(SN ratio) of the reservation packet. The measurement result
`of the received level is compared with a reference reception
`level by an initial transmission power control signal gen-
`erator 40. In accordance with this comparison result, a
`transmission power control signal is generated which des-
`ignates a transmission power when the mobile terminal
`starts transmitting a data packet. The generated transmission
`power control signal is input to an answer packet generator
`38.
`
`In accordance with the reservation contents interpreted by
`the packet interpretation unit 37 and the transmission power
`control signal generated by the initial transmission power
`control signal generator 40, the answer packet generator 38
`generates an answer packet. An example of the structure of
`an answer packet is shown in FIG. 4. A mobile terminal ID
`is an ID of a mobile terminal which transmitted a reservation
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`packet. This ID is used as a destination of the answer packet.
`An allocated channel 101 and an allocated slot number 102
`
`indicate an uplink traffic channel and a time slot to be used
`by the mobile terminal and are designated by the answer
`
`
`
`Case 2:20-cv-00322-JRG Document 1-4 Filed 10/01/20 Page 16 of 19 PageID #: 99
`Case 2:20-cv-00322-JRG Document 1—4 Filed 10/01/20 Page 16 of 19 PageID #: 99
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`US 7,006,463 B2
`
`5
`transmission power 103
`packet generator 38. An initial
`indicates a transmission power when the mobile terminal
`starts transmitting data and is designated by the transmission
`power control signal
`input from the initial
`transmission
`power control signal generator 40. This initial transmission
`power control signal may designate an increase/decrease
`relative to the transmission power when the reservation
`packet was transmitted, or may be an absolute value (in-
`creased/decreased value) of the transmission power, which-
`ever of them is determined by the system. A CRC (Cyclic
`Redundancy Check) 104 is a code added to the answer
`packet for error detection/correction.
`The answer packet generated in the above manner is input
`to a coder 47 whereat an error correction coding such as
`convolutional coding is performed. The coded answer
`packet is input to a unit 41 for inserting a traffic channel
`transmission power control signal.
`The other acquisition/despread circuits 42a to 4211 pro-
`vided for a plurality of uplink traffic channels each output a
`data packet transmitted via each uplink traffic channel. The
`data packet of each channel is supplied via a signal line 52
`to a detector 43a—43n and a decoder 44a to 4411 to be
`
`detected and decoded, and the reception data is output from
`a signal line 54.
`The data packet is also supplied via a signal line 53 to a
`unit 45 for measuring the received level of the traffic
`channel. The structure of this unit 45 is shown in FIG. 5. The
`
`received level measurement units 45a to 4511 corresponding
`to the uplink traffic channels 53a to 5311 measure the
`received level such as an SN ratio.
`The received level measurement result of each traffic
`
`channel is input to a traffic channel transmission power
`control signal generator 46. The structure of the generator 46
`is shown in FIG. 6. Each of the transmission power control
`signal generators 46a to 4611 provided for each uplink traffic
`channel compares the received level with a target reception
`level, and generates a transmission power control signal for
`making the mobile terminal renew the transmission power
`when it continues data transmission. Similar to the initial
`
`transmission power control signal, this renewal designation
`transmission power control signal
`is determined by the
`system. The generated transmission power control signal is
`input to the unit 41 for inserting the traffic channel trans-
`mission power control signal.
`transmission
`As shown in FIG. 7,
`the traffic channel
`power control signal insert unit 41 inserts a common trans-
`mission power control signal 111 generated by the traffic
`channel transmission power control signal generator 46 at a
`predetermined interval between answer packets 110 input
`from the answer packet generator 38. The common trans-
`mission power control signal 111 is constituted of transmis-
`sion power control signals 111a to 11111 of respective traffic
`channels 1 to n.
`
`In order to suppress a fluctuation of the received level of
`a data packet,
`the base station is required to perform a
`transmission power control of each mobile terminal at a
`sufficiently high occurrence frequency. The data packet is
`made of several tens of bits to allow information of some
`amount to be transmitted at the same time. In contrast, the
`common transmission power control signal 111 can be made
`of n bits assuming the same system as 18-95. As shown in
`FIG. 4, the answer packet can be made sufficiently small
`relative to the size of a data packet. Therefore, as in this
`embodiment, even if the answer channel and the transmis-
`sion power control channel are shared,
`the transmission
`power control can be performed at a sufficiently high occur-
`rence frequency. If the answer packet and the common
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`transmission power control signal are received by the same
`channel, the mobile terminal can use a common receiver
`both for the answer packet and common transmission power
`control signal. In this manner,
`the circuit scale of each
`mobile terminal can be made small.
`
`It is also possible to transmit the common transmission
`power control signal at a transmission power larger than that
`of the answer packet
`in order to reliably perform the
`transmission power control.
`The answer packet and common transmission power
`control signal are spectrum spread by a spreader 48 for
`answer channel. The spectrum spread answer packet and
`common transmission power control signal are multiplexed
`with other downlinks by an adder 58, modulated from the
`baseband signal into a signal in the carrier frequency band
`by a transmission radio module 49, and transmitted from the
`antenna 30 via the circulator 31.
`
`An example of the structure of a mobile terminal is shown
`in FIG. 8.
`
`The operation of transmitting a reservation packet from a
`mobile terminal will be described.
`
`Asignal received by an antenna 30 is input via a circulator
`61 to a reception radio module 62. The reception radio
`module 62 performs a high/middle frequency reception
`process to demodulate a signal in the carrier frequency band
`into a baseband signal. A pilot signal output
`from an
`acquisition/spread circuit 150 for a pilot channel is input to
`a unit 151 for measuring a received level. This unit 152
`measures the received level (e.g., SN ratio) of the pilot
`signal. The measurement result of the received level is input
`to a reservation channel gain calculator 152 which deter-
`mines the transmission power of a reservation packet in
`accordance with the received level of the pilot signal.
`In the mobile communication system provided with inde-
`pendent pilot channels, the pilot signal is transmitted from
`the base station always at a constant transmission power
`level. Therefore, if an SN ratio of the receiv