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`6,029,074
`[11] Patent Number:
`United States Patent
`[19]
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`[45] Date of Patent:
`*Feb. 22, 2000
`Irvin
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`[75]
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`[73] Assignee:
`‘
`.
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`[9] Name:
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`[54] HAND-HELD CELLULAR TELEPHONE
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`WITH POWER MANAGEMENT FEATURES
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`Inventor: Dav1d Rand Irvm, Raleigh, NLH
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`firiccsson, Inc.; Research Triangle Park;
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`.
`.
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`Th1s patent Issued on a contmued PTOS'
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`55119011 application filed under 37 CFR
`l.53(d), and is subject to the twenty year
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`term provisions of 35 U.S.C.
`patent
`154(a)(2).
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`[21] Appl. No“ 08/850’913
`‘
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`’7
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`Int. C!‘
`[51]
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`[52] U'S' Cl'
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`WWW; H041} ”40
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`. 455/69; 455/127;
`455522
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`[58] Field Of Search ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 4551622, 69, 569,
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`435/571, 572’ 573s 574’ 115’ 116’ 126’
`127
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`References Clted
`U.S. PATENT DOCUMENTS
`
`
`4599741
`“1987 Mitzlafif.
`
`
`
`.......................... 455/126
`11/1987 Tamura ct al.
`4,709,404
`
`
`
`
`
`
`
`455/571
`9/1992 Funino
`5,146,614
`................... 455/127
`
`
`
`
`
`
`4/1994 Dayani
`5,303,395
`
`
`
`
`
`5,457,814 10/1995 Myrskog et a1.
`.
`
`
`
`
`5,497,507
`3/1996 Komaki t
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`
`
`
`[56]
`
`
`
`
`
`
`
`FOREIGN PATENT DOCUMENTS
`
`
`
`
`
`
`
`
`0 331 435 A2 of 1989
`Japan,
`WO 93/01659 of 1993 WIPO .
`
`
`
`
`
`
`
`
`
`
`WO 96/34461
`of 1996 WIPO .
`
`OTHER PUBLICATIONS
`
`
`
`
`
`
`Pratt, Richard E. and Fitzgibbons, Thomas; “RF Power
`
`
`
`
`
`Configuration Method for Battery Equipped Portable
`
`
`
`
`
`
`
`
`Radiosf’ Motorola; vol. 24; Mar. 1995; pp, 75,77.
`
`“The GSM System;” Radio Resource Management;
`
`
`
`
`1993;pp. 342—346.
`
`
`
`
`
`
`
`
`
`
`Primary Examiner—Lee Nguyen
`
`
`
`
`
`
`
`
`
`Attorney, Agent, or Firm—Coats & Bennett, PLLC
`
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`Amobile terminal includes power control logic which limits
`
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`the maximum transmit power of the mobile radio telephone
`
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`to conserve battery power when it is operated in a hand-held
`
`
`
`
`
`
`
`
`mode. The mobile radio telephone includes power control
`
`
`
`
`
`
`
`
`logic which sets the transmit power in response to power
`control codes received from a base station. The power
`
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`control codes transmitted from the base station correspond
`
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`to designated power levels. Asignal is generated to indicate
`whether the mobile radio telephone is operated in a hand-
`
`
`
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`
`
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`held mode. When the mobile radio telephone is operated in
`
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`
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`a hand-held mode, the power control logic sets the power
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`level at a maximum hand-held power level which is less than
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`.
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`the maX1mum transmit power level.
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`9 Claims, 6 Drawing Sheets
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`38
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`30
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`32
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`Power
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`Control
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`
`Audio
`
`
`Processing
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`Control &
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`Signalling
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`Unit
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`
`1_2
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`44
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`Page 1 of 11
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`SAMSUNG EXHIBIT 1018
`
`SAMSUNG EXHIBIT 1018
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`Page 1 of 11
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`
`US. Patent
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`Feb. 22, 2000
`
`
`
`Sheet 1 0f 6
`
`
`
`6,029,074
`
`
`
`oFW
`
`
`
` 9.530913.o_u:<
`vm.
`
`x...
`
`3.
`
`
`
`LoumufiEammhmco>m_am_otwat?!_
`
`we8E.
`
`F95$;
`
`3
`
`
`
`w6:50
`
`9:556
`
`M:5
`
`mm
`
`'-
`
`VNmm
`
`mm
`
`
`
`m>0mEgonH_
`
`.65:00
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`
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`on
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`bmm
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`Page 2 ofll
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`Page 2 of 11
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`US. Patent
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`Feb. 22, 2000
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`Sheet 2 0f 6
`
`6,029,074
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`200
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`Receive
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`MAC
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`Adjust power
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`according
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`to MAC
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`202
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`206
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`208
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`Page 3 ofll
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`Power inhibit
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`flag = 1
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`Revise MAC
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`= 010
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`Figure 2
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`Page 3 of 11
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`US. Patent
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`Feb. 22, 2000
`
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`Sheet 3 0f 6
`
`6,029,074
`
`
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`300
`
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`304
`
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`Adjust power
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`according
`to MAC
`
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`Receive
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`
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`MAC
`
`
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`Power inhibit
`
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`flag = 1
`
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`302
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`306
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`k
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`MAC = 000
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`or
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`001
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`Revise MAC
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`= 010
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`310
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`Figure 3A
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`Page 4 ofll
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`Page 4 of 11
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`US. Patent
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`Feb. 22, 2000
`
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`Sheet 4 0f 6
`
`6,029,074
`
`
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`322
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`MAC==
`MAC =
`
`
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`000,001,010,
`000,001
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`011 or100
`or010
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` 000,001,010,
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`Revise
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`MAC = 011
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`Revise
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`MAC = 101
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`or 011
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`Revise
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`MAC = 100
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`Figure BB
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`Page 5 ofll
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`Page 5 of 11
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`US. Patent
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`Feb. 22, 2000
`
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`Sheet 5 0f 6
`
`6,029,074
`
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`400
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`404
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`Adjust power
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`according
`to MAC
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`Receive
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`MAC
`
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`Power inhibit
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`flag = 1
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`402
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`406
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`MAC = 000
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`OF
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`001
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`Revise MAC
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`= 010
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`410
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`Figure 4A
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`Page 6 ofll
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`Page 6 of 11
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`US. Patent
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`Feb. 22, 2000
`
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`Sheet 6 0f 6
`
`6,029,074
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`422
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`MAC =
`MAC =
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`000,001,010,
`000,001
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`011 or 100
`or 010
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` 000,001,010,
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`Revise
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`MAC = 101
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`or 011
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`Revise
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`MAC = 011
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`Revise
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`MAC = 100
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`Figure 48
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`Page 7 ofll
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`Page 7 of 11
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`6,029,074
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`2
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`power generally within the aforementioned constraints on
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`energy draw and interference. These solutions are called
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`here the external booster, the high—powered terminal, and the
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`power-exception terminal.
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`The external booster provides a second (external to the
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`terminal) RF power amplifier and associated control cir-
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`cuitry as part of the hands-free cradle. When the hand-held
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`terminal is captured by the cradle, its presence activates the
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`second power amplifier (PA), which is inserted between the
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`hand—held terminal and an external antenna. In practice, the
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`power output level of the hand-held terminal itself is some-
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`times reduced upon insertion into the cradle so as not to
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`overdrive the second PA. Together, the handheld terminal
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`and the external booster work as a Class-I device within the
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`cellular system. The second PA boosts the maximum RF
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`power output typically to 3.0 Watts, thereby providing about
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`7 dB advantage over a 0.6 Watt hand-held terminal in deep
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`fringe operation.
`In order to provide this advantage,
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`however, the mobile unit incurs considerable expense, bulk,
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`complexity, and duplication of resources. For example, U.S.
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`Pat. No. 5,457,814, “Power boost system for cellular
`
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`telephone,” describes an external booster comprising two
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`duplexers, an RF power amplifier,
`fault detector,
`a
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`automatic-power control circuitry, and pulse-width modula-
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`tion circuitry that provides a way of communicating control
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`information between the booster and the hand-held terminal.
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`The second solution proposed by the prior art, called here
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`the high—powered terminal, is taught in U.S. Pat. No. 4,636,
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`741, “Multi-level power amplifying circuitry for portable
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`radio transceivers,” wherein a hand-held unit with an inter-
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`nal high—power PA senses its own insertion into a vehicle
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`cradle, increases its status from Class-3 to Class-1 (3 Watts
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`in the preferred embodiment), and re-registers itself with the
`cellular system under Station Class Mark 1. However, this
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`solution has several drawbacks, including the need for a
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`higher DC supply voltage to sustain the high demands of the
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`power amplifier (PA) when operating in Class—I service, the
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`need for different construction to accommodate the thermal
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`demands of Class-I operation not normally encountered in
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`Class—3 operation, and the added complexity needed to
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`change the Station Class Mark between Class-3 and Class-1.
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`For these reasons, a later U.S. Pat. No. 5,457,814, teaches
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`against the high—powered terminal of the type disclosed in
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`4,636,741, noting that
`the approach leads to “increased
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`weight, bulk and 00st, and greatly diminishes the amplifier
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`reliability of the radiotelephone.”
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`A third solution, called here the power—exception
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`terminal, is disclosed in U.S. patent application Ser. No.
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`08/728,681 filed Oct. 9, 1996 titled “RF Gain Enhancement
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`for Cellular Telephone.” This application describes a coop—
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`erative relationship between a vehicle’s cradle and a Class-3
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`hand-held terminal. Upon insertion into the cradle,
`the
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`terminal increases its power to the maximum level it can
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`sustain within Class-3 operation, and disables its power-
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`control apparatus. Although this solution has the great Virtue
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`of simplicity, it provides no increase in transmitter power
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`over that which the Class-3 terminal has inherently within its
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`grasp, and it incurs the risk, although perhaps slight, of
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`creating undue interference with other radio links whenever
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`its power-control apparatus is disabled.
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`In view of the limitations of the prior art as described
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`above,
`there remains a need for a simple,
`inexpensive
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`hand—held terminal
`that provides increased transmitter
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`power to give better service indoors or in fringe areas,
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`wherein the increased transmitter power is enabled when the
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`terminal is inserted into a docking station used to provide an
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`RF link in support of a portable computer, or into a vehicle’s
`
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`
`
`1
`
`HAND-HELD CELLULAR TELEPHONE
`
`
`
`WITH POWER MANAGEMENT FEATURES
`
`
`
`FIELD OF THE INVENTION
`
`
`
`The present invention relates generally to the field of
`
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`
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`mobile radio communication devices and more particularly
`
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`
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`to a method and apparatus for controlling the transmit power
`
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`level in a mobile communication device.
`
`
`
`
`BACKGROUND
`
`
`The range of a radio communication link, for example the
`
`
`
`
`
`
`
`
`radio link used to connect a hand—held cellular telephone to
`
`
`
`
`
`
`
`a cellular base station, depends on a number of factors.
`
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`
`
`Among these are receiver sensitivity at
`the base station,
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`
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`antenna gain at the receiver and transmitter, path loss, and
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`RF transmitter power at the hand-held terminal. In general,
`
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`a more powerful hand-held terminal will have greater capa-
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`bility to provide service within shielding structures such as
`
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`buildings and to sustain conversations deeper into fringe
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`areas.
`
`5
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`10
`
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`Nevertheless, the advantages of having a powerful termi-
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`nal are counterbalanced by a number of practical consider—
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`ations that limit the amount of power usefully disposed to a
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`hand-held terminal. Primary among these considerations are
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`the need to conserve the draw of electrical energy from the
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`terminal’s small rechargeable battery, and the need to
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`throttle power to the lowest useable level so as to avoid
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`interference with other radio links active at the same time.
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`Under certain conditions, however,
`the need to limit
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`power is relaxed, for example or when the cellular terminal
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`is used in a home docking station to provide data, voice, or
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`security-system-backup communications, or when the cel-
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`lular terminal is operated with a hands-free cradle in a motor
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`vehicle. In these and similar applications, the docking sta-
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`tion or cradle makes external power available, often by way
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`of an integral battery charger, thereby easing the battery-
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`draw constraint. In both cases, however, the need remains to
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`throttle power as appropriate to avoid unnecessary interfer-
`
`
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`
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`ence.
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`In order to minimize interference, a cellular base station
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`measures the strength of the incoming signal it receives from
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`the mobile unit, and instructs the mobile unit to adjust its
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`radiated power to the lowest level adequate to sustain good
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`quality communications. This enables the mobile station to
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`maintain communications as it moves about and experiences
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`variations in path loss. The power adjustments ordered by
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`the base station must, of course, fall within the capability of
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`the terminal to supply RF power, and must further fall Within
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`the practical constraints of energy draw.
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`Within the accepted industry standards for cellular
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`telephones, terminal power is generally categorized by class.
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`For example, a terminal designed for operation with a GSM
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`system falls into one of five classes, where those classes
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`have maximum peak power-output limits ranging from 20
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`W'atts (Class 1) to 0.8 Watts (Class 5), and where the power
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`adjustments commanded by the base station take place over
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`15 steps of 2 decibels (dB) each. Within the AMPS system
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`used in North America and elsewhere, three classes are used
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`which have a maximum transmit power of 6 de (Class 1),
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`2 de (Class 2), and —2 de (Class 3). Because of battery
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`limitations, handheld terminals ordinarily operate as Class-3
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`devices. This unfavorably limits their capability to provide
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`good quality service within buildings and in deep-fringe
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`areas. To overcome such limitations when hand-held termi-
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`nals are used with hands—free accessory cradles in motor
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`vehicles, the prior art teaches three solutions to maximizing
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`tom
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`30
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`L»LA
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`40
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`50
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`60
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`Page 8 ofll
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`Page 8 of 11
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`6,029,074
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`4
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`audio processing circuit 22 provides basic analog audio
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`outputs to a speaker 34 and accepts analog audio inputs from
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`a microphone 32. Received signals picked up by the antenna
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`30 are demodulated and decoded by the receiver 24. The
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`transmitter 26 encodes and modulates signals passed to it by
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`the audio processing circuits 22, The output of the trans-
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`mitter 26 is amplified by a power amplifier 36 which is
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`controlled by a power control unit 38. The power amplifier
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`36 and power control unit 38 determine the power level at
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`which the signal is transmitted.
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`The control and signaling unit 12 performs most of the
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`control functions of the radio telephone 10. One of these
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`functions is power control. The control and signaling unit 12
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`controls the transmit power level of the mobile terminal 10
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`in accordance with commands received from the base sta-
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`tion. In the AMPS system used in North America, there are
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`a total of 8 power levels. The base station determines the
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`appropriate power level for the mobile terminal 10 based on
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`strength and quality measurements on the signal received
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`from the mobile telephone 10. The base station sends power
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`control signals to the mobile terminal 10. The power control
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`signals are sent via the slow Associated Content Channel
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`(SACCH) or
`the Fast Associated Control Channel
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`(FACCH). The control and signaling unit 12 then sets the
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`transmit power level of the mobile terminal 10 based on the
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`signals received from the base station.
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`The power control signals transmitted by the base station
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`to the mobile terminal 10 are in the form of a mobile
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`attenuation code (MAC). Table 1 below sets forth the MAC
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`and power associated with each power level in the AMPS
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`system for Class I, II, and III devices.
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`3
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`hands—free cradle, and yet wherein the terminal operates
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`within known constraints imposed by battery capacity used
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`as a hand-held device.
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`SUMMARY OF THE INVENTION
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`The present invention provides a mobile radio telephone
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`which includes power control logic to limit the maximum
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`transmit power of the mobile telephone when it is operated
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`in a hand-held mode. The transmit power of the mobile
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`terminal is set in response to power control codes received
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`from a base station. In the preferred embodiment, the power
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`control codes are mobile attenuation codes which corre-
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`spond to pre-defined power levels. The power levels include
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`a maximum transmit power level and a plurality of lower
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`power levels. When the mobile terminal is operated in a
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`hand -held mode, one of the lower power levels is designated
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`as the maximum hand—held transmit power level. Upon
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`receipt of a mobile attenuation code from the base station,
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`the mobile terminal determines whether the unit is operating
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`in a hand—held mode, and if so, whether the mobile attenu—
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`ation code calls for a power level greater than the maximum
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`hand-held transmit power level. If both these conditions are
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`met, the transmit power level is set equal to the maximum
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`hand-held transmit power level. In all other cases,
`the
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`transmit power level is set to the power level designated by
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`the mobile attenuation code.
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`In other embodiments, the power levels associated with
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`the various mobile attenuation codes are optionally reduced
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`for hand-held use by menu-driven user input or in automatic
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`response to signals that indicate low battery reserves in order
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`to prolong battery life at the expense of transmission range.
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`DETAILED DESCRIPTION OF THE DRAWINGS
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`FIG. 1 is a block diagram of a mobile terminal according
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`to the present invention.
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`FIG. 2 is a flow diagram of the power control logic for the
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`mobile terminal.
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`FIGS. 3A AND 3B are a flow diagram of the power
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`control logic wherein the power cap is varied based on a
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`selection by a user.
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`FIGS. 4A AND 4B are a flow diagram of the power
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`control logic wherein the power cap is varied based on the
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`state of the battery.
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`DESCRIPTION OF THE INVENTION
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`Referring now to the drawings, an improved hand-held
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`mobile terminal according to the present invention is shown.
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`The hand-held mobile terminal 10 is a fully functional,
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`battery powered, mobile transceiver capable of sending and
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`receiving voice and/or data signals. The hand—held mobile
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`terminal 10 may also be inserted into a cradle in a vehicle or
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`connected to a docking station. The hand-held mobile ter-
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`minal 10 of the present invention is a Class 2 AMPS radio
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`telephone. It will be appreciated, however, that the invention
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`might also be advantageously used in Class 1 or other
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`devices.
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`The mobile terminal 10 includes a microprocessor [2 for
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`controlling the operation of the mobile terminal 10 and a
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`program memory 14 for storing programs used by the
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`mobile terminal [0. The microprocessor 12 is interfaced by
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`a system bus 16 with a keypad 18, display 20, audio
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`processing circuits 22, receiver 24, and transmitter 26. The
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`keypad 18 and display 20 provide a user interface. The
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`receiver 24 and transmitter 26 are coupled to an antenna 30
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`by coupler 28 so as to permit fill duplex communication. The
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`10
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`tom
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`30
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`Page 9 ofll
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`Power
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`Level
`0
`1
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`2
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`3
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`4
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`5
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`6
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`7
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`MAC
`000
`001
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`010
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`011
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`100
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`101
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`110
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`111
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`Class I
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`6
`2
`—2
`—6
`—10
`714
`718
`722
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`Power For Class in deV
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`Class II
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`2
`2
`—2
`—6
`—1D
`714
`718
`722
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`Class III
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`—2
`—2
`—2
`—6
`—10
`714
`718
`722
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`—2 de=0.631 Watts; 2 de=1.58 Watts; 6 de=3.98
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`Watts
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`When the mobile terminal 10 receives a power control
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`signal from the base station,
`it sends instructions to the
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`power control module 38 to adjust
`the transmit power
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`accordingly. The power control module 38 includes a series
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`of attenuators or other components for controlling the output
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`of the power amplifier 36. The power amplifier 36 may be
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`a single stage amplifier or a multiple—stage amplifier. If a
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`multiple stage amplifier is used, the power control module
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`38 could include multiple bias adjustments and attenuators
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`for controlling the output in each stage of the power ampli—
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`fier 36. There are a wide variety of power amplifiers and
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`controls which could be used and which are well known to
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`those skilled in the art Therefore, a detailed description of
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`the power amplifier and power control is omitted.
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`The hand-held terminal 10 includes power limiting logic
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`to effectively limit the transmit power to a predetermined
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`maximum hand-held power level when used as a hand-held
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`device. In the preferred embodiment of the invention, the
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`maximum hand—held power level is less than the maximum
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`power level for Class 2 devices. More specifically, in the
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`Page 9 of 11
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`6,029,074
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`6
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`mately 0.100 Watts. If option C is selected, the terminal’s
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`power is capped by limiting the MAC to 101, which
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`corresponds to —14 de or approximately 0.040 Watts. If no
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`option is selected, the hand-held power is limited to a default
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`value of —2 de.
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`FIGS. 3A and 3B show the power control logic for a
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`mobile terminal having a user—selectable power cap. The
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`terminal waits for a MAC from the base station. When a
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`MAC is received (block 300), the mobile terminal 10 checks
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`the power inhibit flag (block 302). If the power inhibit flag
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`(=0), the power level is adjusted according to the MAC
`is 0
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`(block 304). Otherwise the mobile terminal 10 determines
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`whether the user has activated a power cap (block 306). If
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`the power limit option is not selected, the mobile terminal
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`checks the value of the MAC (block 308) and revises the
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`MAC if it has a value of 000 or 001 (block 310). If the MAC
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`has a value other than 000 or 001, then the power level is
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`adjusted according to the MAC (block 304).
`If the power limit option is activated, the mobile terminal
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`10 determines the option selected (block 312) and then the
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`program flow branches depending upon which option is
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`selected. After determining the option selected, the mobile
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`terminal 10 checks the value of the MAC (blocks 314, 318,
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`322). The MAC is revised for specified values (blocks 316,
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`320, 324) and otherwise remains unchanged. The mobile
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`terminal 10 then adjusts the power level according to the
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`MAC (block 304).
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`In another embodiment (FIGS. 4A and 4B),
`the basic
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`process of MG. 3 is adapted to optionally cap power
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`according to the state of charge of the terminal’s battery.
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`the user interacts through a menu to activate or
`Again,
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`deactivate this option. In this case, however,
`the further
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`selection of option A, B, or C is automatically coupled to a
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`battery-charge indicator, for example to the six-state indi-
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`cator provided by the Ericsson All-310 cellular telephone
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`terminal. In the illustrative example shown in FIG. 4, battery
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`states B5 and B4 are logically coupled to power option A,
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`battery states B3 and B2 are coupled to power option B, and
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`battery states B1 and B0 are coupled to power option C.
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`FIGS. 4A and 4B show the power control logic for a
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`mobile terminal having a power cap logically coupled to the
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`terminal’s battery state. The terminal waits for a MAC from
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`the base station. When a MAC is received (block 400), the
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`mobile terminal 10 checks the power inhibit flag (block
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`402). If the power inhibit flag is off (=0), the power level is
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`adjusted according to the MAC (block 404). Otherwise the
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`mobile terminal 10 determines whether the user has acti-
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`vated a power cap (block 406). If the power limit option is
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`not activated, the mobile terminal checks the value of the
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`MAC (block 408) and revises the MAC if it has a value of
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`000 or 001 (block 410). If the MAC has a value other than
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`000 or 001, then the power level is adjusted according to the
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`MAC (block 404).
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`If the power limit option is activated, the mobile terminal
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`10 determines the state of the battery (block 412) and then
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`checks the value ofthe MAC (blocks 414,418,422). The
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`MAC is revised for specified values (blocks 416, 420, 424)
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`and otherwise remains unchanged. The mobile terminal 10
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`then adjusts the power level according to the MAC (lock
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`404).
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`What is claimed is:
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`1. Amethod for controlling the transmit power in a radio
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`mobile terminal having a power class rating comprising:
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`a) establishing a plurality of power levels including a
`maximum transmit power level and a plurality of lower
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`power levels;
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`b) establishing a maximum hand-held power level which
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`is less than said maximum transmit power level for the
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`present power class rating of the mobile terminal;
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`5
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`preferred embodiment the MAC corresponding power level
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`0 and power level 1 is revised downward when the mobile
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`terminal 10 is used as a hand-held device to artificially limit
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`the maximum transmit power. For example, when the MAC
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`is equal to 000 or 001, it is changed to 010. As shown in
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`Table 1, this limits the transmit power of the mobile terminal
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`to —2 de. Where the mobile terminal 10 is inserted into a
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`cradle of a vehicle or attached to a docking station having an
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`external power source, the power level is adjusted according
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`to the MAC for all values. Thus, for Class 2 devices, the
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`mobile terminal 10 would have a maximum transmit power
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`of 2 de when docked to a cradle or other docking station.
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`FIG. 2 is a flow diagram showing the power control logic
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`used by the mobile terminal 10. The terminal 10 awaits
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`receipt of a mobile attenuation code (MAC). Upon its receipt
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`(block 200), the MAC is compared with values 000 and 001
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`(block 202), both of which correspond in the AMPS systems
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`to the Class-2 RF power levels of +2 de (1.58 Watts). If
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`the MAC has neither value 000 nor value 001, the power
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`control logic adjusts power according to the MAC (block
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`204).
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`If the MAC has values 000 or 001, the power control logic
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`checks the status of the power-inhibit flag (block 206),
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`which indicates whether the terminal
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`hand—held device or as a captured device as explained below.
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`If the power inhibit flag is set
`to zero, which indicates
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`capture of the terminal by a docking station or cradle, the
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`power control
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`MAC(block 204), If the power-inhibit flag is set
`to one,
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`which indicates hand—held use, the MAC is revised from 000
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`or 001 to 010 (block 208), and the power control logic
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`adjusts power according to the revised MAC (block 204).
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`The power—inhibit flag is set as follows. In the preferred
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`embodiment, the presence of a docking station (fiag=0) is
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`indicated by a data-communications clear-to send signal on
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`the terminal’s system bus. For this purpose, however, an
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`equivalent signal can be provided by other recognized
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`data-communication protocol signals, by a mechanical key
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`indicating the terminal’s capture by the docking station, by
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`the disablement of the terminal’s internal microphone, by
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`the presence of an infrared link indicating the connection of
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`the terminal with a portable or other computer, by means of
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`an explicit signal communicated to the terminal through its
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`system bus, or by any number of equivalent
`indicators.
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`Capture by a vehicle’s hands—free cradle (flag=0) is indi—
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`cated in the preferred embodiment by the connection of an
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`external antenna. For this purpose, however, an equivalent
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`signal can be provided by other indicators such as a
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`mechanical key indicating capture by a cradle, by the
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`disablement of the terminal’s internal speaker, by means of
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`a signal communicated to the terminal through its system
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`bus, or by any number of equivalent indicators. Hand-held
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`status is indicated by the absence of any signal that the
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`terminal has been captured by a docking station or cradle. In
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`such case, the power inhibit flag is set equal to 1. Otherwise,
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`the power inhibit flag is set equal to 0.
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`The power control logic can be modified to allow the user
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`the option of selecting a power cap to be observed when the
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`mobile terminal is operated in a hand-held mode. The user
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`can interact with the mobile terminal 10 using the keypad 18
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`and display 20 to select a power cap.
`In a preferred
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`embodiment, the user can select one of three power caps: A,
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`B, and C. If option A is selected, the terminal’s power is
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`capped by limiting the