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`EXHIBIT I
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`

`

`US007039435B2
`
`(12)
`
`United States Patent
`McDOWell et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 7,039.435 B2
`May 2, 2006
`
`(54) PROXIMITY REGULATION SYSTEM FOR
`USE WITH A PORTABLE CELL PHONE AND
`A METHOD OF OPERATION THEREOF
`
`75
`Citat R
`(75) Inventors: Rita, R
`, nip J. Vooney, SellerSV1lle,
`PA (US)
`
`(73) Assignee: Agere Systems Inc., Allentown, PA
`(US)
`
`(*) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 565 days.
`
`(21) Appl. No.: 09/967,140
`
`22) Filed:
`(22) File
`(65)
`
`Sep. 28, 2001
`ep. ARS,
`Prior Publication Data
`US 2003 FOO64732 A1
`Apr. 3, 2003
`
`(51) Int. Cl.
`(2006.01)
`H04B 7/00
`(52) U.S. Cl. ................. 455/522:455/575.5; 455/115.1
`(58) Field of Classification Search ................ 45.5/522,
`455/456.1, 574, 575.5, 572, 127.1, 115.1,
`455/550.1, 300, 301, 569.1, 575.6, 100
`See application file for complete search history.
`
`(56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`4,636,741 A *
`1/1987 Mitzlaff ...................... 33Of 127
`
`6, 195,562 B1* 2/2001 Pirhonen et al. ......... 455,553.1
`6,408, 187 B1
`6/2002 Merriam ..................... 455,458
`6,456,856 B1* 9/2002 Werling et al. .......... 455/575.5
`6,498,924 B1* 12/2002 Vogel et al. ...
`... 455,67.11
`2003/0064761 A1* 4/2003 Nevermann ................. 455,572
`2003/0076168 A1* 4, 2003 Forrester ...
`... 330,129
`2004/0176125 A1* 9, 2004 Lee ...........
`... 455,522
`2004/0203345 A1 * 10, 2004 Tehrani .
`... 455, 11.1
`2005.0075,123 A1* 4, 2005. Jin et al. ..........
`... 455,522
`2005/0093624 A1* 5/2005 Forrester et al. ............ 330,129
`2005, 0124305 A1
`6/2005 Stichewbout .............. 455,117
`
`FOREIGN PATENT DOCUMENTS
`O 843 421 A2
`5, 1998
`EP
`O 977 304 A1
`2, 2000
`EP
`WO 98.29968
`7, 1998
`WO
`WO O2/O5443 A2
`1, 2002
`WO
`* cited by examiner
`
`Primary Examiner Sonny Trinh
`
`ABSTRACT
`57
`(57)
`A proximity regulation system for use with a portable cell
`phone and a method of operating the same. In one embodi
`ment, the proximity regulation system includes a location
`sensing Subsystem that is configured to determine a location
`of the portable cell phone proximate a user. A power
`governing Subsystem is coupled to the location sensing
`Subsystem and configured to determine a proximity transmit
`power level of the portable cell phone based on the location.
`
`9 Claims, 3 Drawing Sheets
`
`-500
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`--
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`DETERMINE
`EIN 1510
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`PROVIDE
`CONTROL
`SIGNAL
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`--520
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`YES
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`DOES THE CONTROLSIGNAL \o
`INDICATE CELL PHONE
`PROXATE THE USER
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`
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`REDUCE
`MAX TRANSMIT
`POWER
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`-340
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`TRANSMITAT
`REDUCED LEVEL
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`-350
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`TRANSMIT
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`- 560
`
`END
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`370
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`US 7,039.435 B2
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`s
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`Sis-SS
`rea 227
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`U.S. Patent
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`May 2, 2006
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`Sheet 2 of 3
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`US 7,039.435 B2
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`FIG. 2
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`
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`DATA
`MODE
`CIRCUIT
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`210
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`280
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`220
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`250
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`U.S. Patent
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`May 2, 2006
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`Sheet 3 of 3
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`US 7,039.435 B2
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`FIG. 3
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`305
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`DETERMINE
`LOCATION
`
`310
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`PROVIDE
`CONTROL
`SIGNAL
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`320
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`
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`YES
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`
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`DOES THE CONTROLSIGNAL \o
`INDICATE CELL PHONE
`PROXIMATE THE USER
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`REDUCE
`MAX RANSMIT
`POWER
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`TRANSMITAT
`REDUCED LEVEL
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`TRANSMIT
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`360
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`US 7,039,435 B2
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`1.
`PROXMITY REGULATION SYSTEM FOR
`USE WITH A PORTABLE CELL PHONE AND
`A METHOD OF OPERATION THEREOF
`
`TECHNICAL FIELD OF THE INVENTION
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`5
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`The present invention is directed, in general, to a mobile
`telecommunications device and, more specifically, to a sys
`tem and method of determining a proximity transmit power
`level of a portable cell phone based on a proximity to a user.
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`BACKGROUND OF THE INVENTION
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`2
`SUMMARY OF THE INVENTION
`
`To address the above-discussed deficiencies of the prior
`art, the present invention provides a proximity regulation
`system for use with a portable cell phone. In one embodi
`ment, the proximity regulation system includes a location
`sensing Subsystem that is configured to determine a location
`of the portable cell phone proximate a user. A power
`governing Subsystem is coupled to the location sensing
`Subsystem and configured to determine a proximity transmit
`power level of the portable cell phone based on the location.
`In another aspect, the present invention provides a method
`of operating a portable cell phone including determining a
`location of the portable cell phone proximate a user. The
`method further includes providing a control signal based on
`the location, and determining a proximity transmit power
`level of the portable cell phone based on the control signal.
`In yet another aspect, the present invention provides a
`portable cell phone that includes a power circuit as a
`function of a position to a communications tower and a
`proximity regulation system. The proximity regulation sys
`tem includes a location sensing Subsystem that determines a
`location of the portable cell phone proximate a user. The
`proximity regulation system also includes a power govern
`ing Subsystem, coupled to the location sensing Subsystem,
`that determines a proximity transmit power level of the
`portable cell phone based on the location.
`The foregoing has outlined, rather broadly, preferred and
`alternative features of the present invention so that those
`skilled in the art may better understand the detailed descrip
`tion of the invention that follows. Additional features of the
`invention will be described hereinafter that form the subject
`of the claims of the invention. Those skilled in the art should
`appreciate that they can readily use the disclosed conception
`and specific embodiment as a basis for designing or modi
`fying other structures for carrying out the same purposes of
`the present invention. Those skilled in the art should also
`realize that Such equivalent constructions do not depart from
`the spirit and scope of the invention in its broadest form.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`For a more complete understanding of the present inven
`tion, reference is now made to the following descriptions
`taken in conjunction with the accompanying drawings, in
`which:
`FIG. 1 illustrates a network diagram of an embodiment of
`a cellular telephone network employing a portable cell
`phone constructed in accordance with the principles of the
`present invention;
`FIG. 2 illustrates a block diagram of an embodiment of a
`portable cell phone employing a proximity regulation sys
`tem constructed in accordance with the principles of the
`present invention; and
`FIG. 3 illustrates a flow diagram of an embodiment of a
`method of operating a portable cell phone constructed in
`accordance with the principles of the present invention.
`
`DETAILED DESCRIPTION
`
`Referring initially to FIG. 1, illustrated is a network
`diagram of an embodiment of a cellular telephone network,
`generally designated 100, employing a portable cell phone
`120 constructed in accordance with the principles of the
`present invention. The cellular telephone network 100
`includes a communications tower 110 in communication
`with the portable cell phone 120, employable by a portable
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`Since the inception of the wireless or cellular ("cell')
`phone in the late 1940s, cell phone usage has expanded
`beyond their utilitarian beginnings. Presently, cell phones
`are being used in every aspect of business along with every
`facet of personal life. People of all ages are now using cell
`phones as the price of cell phones and services decrease.
`Presently, more than 74 million cell phones are in use in the
`United States with estimates predicting more than 139
`million in a few years. Cell phones are moving beyond
`communication tools, and are now taking a place in history
`by weaving themselves into the Social fabric by becoming
`fashion statements and symbols of power and importance.
`Along with the increase in usage has come the requests for
`improved service and communication quality. Consumers
`are now looking for more than just wireless voice commu
`nication but also Internet access, calendars, organizers, and
`30
`even games. Meanwhile, manufacturers struggle to meet
`consumer demands for more options and better quality of
`service.
`Typically, the quality of service of a cell phone is pro
`portional to the transmit power level of the cell phone.
`Though no definite proof has been determined, health con
`cerns have arisen due to the power used to transmit the radio
`frequency of cell phones when operated close to the body of
`a cell phone user. For example, when held close to the ear,
`many users have health concerns about the high levels of
`40
`radio frequency energy causing damage to brain cells.
`Most of the concerns from consumers center around using
`the cellphone close to the ear or head of a user. New studies,
`however, have also suggested that cell phone usage may
`possibly cause stomach cancer when located near the mid
`45
`section when sending and receiving data text messaging.
`Cell phone users still want the best possible quality of
`service from their cell phone. However, health concerns
`regarding the transmit power of cell phones are now begin
`ning to affect some users.
`Manufacturers have tried several options to relieve the
`fears of consumers. One such option involves permanently
`reducing the power of the transmitter in cellphones. Though
`this may be perceived as a safety advantage to some cus
`tomers, unfortunately, this also reduces the quality of service
`55
`of the cell phone. Another option for consumers is the use of
`cell phones with a base that typically allows a higher
`transmit power level of up to three watts. This may be the
`case for a cell phone that is permanently mounted. Such as
`in an automobile. These type of cell phones, however, do not
`allow the flexibility demanded by consumers that is found in
`the use of a portable cell phone.
`Accordingly, what is needed in the art is a system and
`method to automatically reduce the transmit power level of
`a portable cell phone when located near a human body
`thereby decreasing the perception of health risks associated
`with the use thereof.
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`regulation system 140. In another embodiment, the proxim
`ity regulation system 140 may be used with a personal
`digital assistant or any other portable device that may emit
`radio frequency energy within the vicinity of a user.
`The portable cell phone user 150 is typically anyone who
`uses a portable cellphone. This, of course, includes children
`through senior adults. In the illustrated embodiment, the
`portable cell phone user 150 is using the portable cell phone
`120 proximate their head. Alternatively, the portable cell
`phone user 150 may use the portable cell phone 120 while
`attached to a belt clip or in conjunction with a headset. In
`another embodiment, the portable cell phone user 150 may
`use the portable cell phone 120 for data text messaging. In
`this case, the portable cell phone 120 may be typically
`located in front of the portable cell phone user 150 and
`within a distance of an arm’s length. It is also contemplated
`that the portable cell phone 120 may transmit and receive
`other forms of multimedia communications such as video.
`Turning now to FIG. 2, illustrated is a block diagram of
`an embodiment of a portable cell phone, generally desig
`nated 200, employing a proximity regulation system 210
`constructed in accordance with the principles of the present
`invention. The portable cell phone 200 includes the prox
`imity regulation system 210, a power circuit 240, a headset
`operation mode input 250, a belt clip sensor 260 and a data
`transfer operation mode circuit 270. The portable cell phone
`200 is attached to a belt clip 280 having a position indicator
`290. The proximity regulation system 210 includes a loca
`tion sensing Subsystem 220 and a power governing Sub
`system 230.
`The proximity regulation system 210 determines a prox
`imity transmit power level of the portable cell phone 200
`based on the location of the portable cell phone 200 proxi
`mate a portable cell phone user. In the illustrated embodi
`ment, the proximity regulation system 210 is a dedicated
`device that is solely hardwired. As discussed above with
`respect to FIG. 1, the proximity regulation system 210 is
`coupled to the power circuit 240. Additionally, the proximity
`regulation system 210 is coupled to the headset operation
`mode input 250, the belt clip sensor 260 and the data transfer
`operation mode circuit 270. Of course, a portable cell phone
`may still employ the proximity regulation system 210 with
`out the headset operation mode input 250, the belt clip
`sensor 260 or the data transfer operation mode circuit 270.
`The location sensing subsystem 220 is coupled to the
`power governing Subsystem 230, and determines a location
`of the portable cell phone 200 proximate a user. In the
`illustrated embodiment, the location sensing subsystem 220
`is embodied in an integrated circuit. In another embodiment,
`the location sensing Subsystem 220 may be embodied as a
`sequence of operating instructions.
`In an exemplary embodiment, the location sensing Sub
`system 220 determines that the portable cell phone 200 is
`proximate the head of the user if there is no indication that
`the portable cell phone 200 is in a data transfer operation
`mode, a headset operation mode or located on a belt clip. In
`another embodiment, the location sensing Subsystem 220
`may determine if the portable cell phone 200 is proximate
`the head of the user through a designated sensor 225 located
`on the portable cell phone 200.
`The designated sensor 225 may be an inductively coupled
`loop that changes a Surrounding magnetic field when in the
`vicinity of the user's head. The change in the magnetic field
`creates a change in the inductive coupling thereby causing
`an impedance change associated with the inductively
`coupled loop. The impedance change may affect the current
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`cellphone user 150. The portable cell phone 120 includes an
`antenna 125, a power circuit 130 and a proximity regulation
`system 140.
`The communications tower 110 is a conventional com
`munications tower that is positioned to communicate with
`the portable cell phone 120. The communications tower 110
`may provide either analog or digital communications
`depending on the cellular telephone network 100 being used.
`For more information regarding communications towers and
`their use in cellular telephone networks, see “Mobile Com
`10
`munications Engineering: Theory and Applications” by Wil
`liam C. Y. Lee, McGraw Hill (1997), which is incorporated
`herein by reference.
`In the illustrated embodiment, the portable cell phone 120
`is a digital cell phone capable of receiving both voice and
`text messaging. In an alternative embodiment, the portable
`cell phone 120 may also be capable of using a headset
`attachment to allow hands-free operation. The portable cell
`phone 120 may also attach to a belt clip for storage or for use
`in conjunction with a headset attachment. In addition, the
`portable cellphone 120 may also allow hands-free operation
`while stored in a cradle. The cradle may be a conventional
`cradle, which is constructed to hold or store the portable cell
`phone 120.
`The antenna 125 is a conventional portable cell phone
`antenna that provides communications between the portable
`cell phone 120 and the communications tower 110. Through
`the antenna 125, the portable cell phone 120 sends and
`receives voice or data communications across the cellular
`telephone network 100 via the communications tower 110.
`In the illustrated embodiment, the power circuit 130 may
`be a typical power circuit in the portable cellphone 120 that
`produces a transmit power level equivalent to, for instance,
`a maximum transmit power level of one watt. Through
`communications with the communications tower 110
`employing the antenna 125, the power circuit 130 may also
`provide a network adjusted transmit power level that is
`lower than the maximum transmit power level of one watt.
`The network adjusted transmit power level is based on a
`transmit signal strength of a communications path between
`the communications tower 110 and the portable cell phone
`120.
`In an advantageous embodiment of the present invention,
`the power circuit 130 is further coupled to the proximity
`regulation system 140 that determines a proximity transmit
`power level of the portable cell phone 120 based on its
`location proximate the portable cell phone user 150. Though
`not illustrated in FIG. 1, the proximity regulation system 140
`includes a location sensing Subsystem and a power govern
`ing Subsystem, which cooperate to determine both the proX
`imity transmit power level and when it may be employed.
`Both the location sensing Subsystem and the power govern
`ing subsystem are more fully discussed with respect to FIG.
`2.
`The proximity regulation system 140 in the illustrated
`embodiment, is a dedicated device that is constructed of
`special-purpose hardware employing a software program,
`which directs its operation. In an alternative embodiment,
`the proximity regulation system 140 may be integrated into
`a power algorithm employing Software that controls the
`power circuit 130. The proximity regulation system 140 may
`be installed when the portable cell phone 120 is constructed.
`Alternatively, the proximity regulation system 140 may be
`an after market addition to the already constructed portable
`cellphone 120. In one embodiment, the proximity regulation
`system 140 may be installed with a switch that allows the
`portable cell phone user 150 to disengage the proximity
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`flow in the inductively coupled loop, which can be used to
`indicate the proximity of the portable cell phone 200 to the
`user's head.
`In an alternative embodiment, the designated sensor 225
`may also be a contact sensor that indicates proximity of the
`portable cell phone 200 to the user's head when the portable
`cell phone 200 is touching the user's ear. The contact sensor
`may also indicate proximity of the portable cell phone 200
`to the user by contact from the user's hand. One skilled in
`the pertinent art will understand that other sensors may be
`used to indicate the proximity of the portable cell phone 200
`to the user's body.
`In an alternative embodiment, the location sensing Sub
`system 220 determines that the portable cell phone 200 is
`proximate the body of the user when receiving an indication
`from the data transfer operation mode circuit 270. Addition
`ally, the location sensing Subsystem 220 may determine that
`the portable cellphone 200 is proximate the body of the user
`if the portable cell phone 200 is located on the belt clip 280
`or a headset is inserted in the headset operation mode input
`250. Still, another embodiment may indicate that the por
`table cell phone 200 is away from the body of the user when
`the portable cell phone 200 is in a cradle.
`The power governing subsystem 230 is coupled to the
`location sensing Subsystem 220. The power governing Sub
`system 230 determines the proximity transmit power level of
`the portable cell phone 200 based on the location of the
`portable cell phone 200 as determined by the location
`sensing Subsystem 220. In one embodiment, the network
`adjusted transmit power level may be reduced to a value
`determined by the proximity transmit power level when the
`location of the portable cell phone 200 is within the vicinity
`of the user's head. In another embodiment, the network
`adjusted transmit power level may be similarly reduced
`when the location of the portable cell phone 200 is just
`within the vicinity of a user's body.
`In another embodiment, the proximity transmit power
`level may match the network adjusted transmit power level,
`which may be the maximum transmit power level of for
`instance, one watt, when the portable cell phone 200 is
`operating in the headset operation mode or the data transfer
`mode. In still another embodiment, the proximity transmit
`power level may be further reduced when the portable cell
`phone user is a child. A switch 235 may be installed on the
`portable cell phone 200 to allow this user option. Addition
`ally, the switch 235 may also allow the user to disengage the
`proximity regulation system 210 whenever desired. In one
`embodiment, the switch 235 may be a standard software
`Switch that the user controls through a display and a keypad
`of the portable cell phone 200.
`The headset operation mode input 250 is a conventional
`receptacle for receiving a headset that allows hands-free
`operation. As mentioned above, the headset operation mode
`input 250 is coupled to the proximity regulation system 210.
`The location sensing Subsystem 220 of the proximity regu
`lation system 210 receives an indication that the headset is
`in use from the headset operation mode input 250 when a
`headset is inserted. In one embodiment, the location sensing
`subsystem 220 determines that the portable cell phone 200
`is not within the vicinity of the head of the user upon
`receiving indication from the headset operation mode input
`250.
`In another embodiment, the location sensing Subsystem
`220 may determine that the portable cell phone 200 is within
`the vicinity of the user's body if the headset is inserted in the
`headset operation mode input 250. In an alternative embodi
`ment, the location sensing Subsystem 220 may determine
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`that the headset operation mode input 250 may be used in
`conjunction with the belt clip sensor 260 to indicate that the
`portable cell phone 200 is proximate the user's body.
`The belt clip sensor 260 is coupled to the proximity
`regulation system 210 and indicates when the portable cell
`phone 200 is located within the belt clip 280. The belt clip
`sensor 260 may be a contact sensor that is depressed by a
`protrusion on the belt clip 280 when placed in the belt clip
`280. In an alternative embodiment, the belt clip sensor 260
`may use an inductively coupled loop constructed to indicate
`to the location sensing subsystem 220 that the portable cell
`phone 200 is in the belt clip 280.
`The data transfer operation mode circuit 270 is coupled to
`the proximity regulation system 210 and indicates to the
`location sensing Subsystem 220 of the proximity regulation
`system 210 when the portable cell phone 200 is being used
`for data text messaging. As mentioned above with respect to
`the discussion of the antenna 125 of FIG. 1, the data text
`messaging may be received from a communications network
`via an antenna Such as those shown in FIG. 1.
`The belt clip 280 is a conventional device for holding the
`portable cell phone 200. The belt clip 280 is typically
`constructed of plastic and constructed to attach to a user's
`belt. The belt clip 280 may hold the portable cell phone 200
`when the user is not using the portable cell phone 200. In
`alternative embodiments, the belt clip 280 may hold the
`portable cellphone 200 when the headset is being employed.
`In other embodiments, another type of clip may be used by
`the user to hold the portable cell phone 200. For example,
`instead of the belt clip 280, the user may store the portable
`cell phone 200 in a clip that attaches to a shirt pocket or an
`arm band.
`The position indicator 290 of the belt clip 280 may be a
`protrusion that depresses the belt clip sensor 260 on the
`portable cell phone 200 to indicate to the location sensing
`subsystem 220 that the portable cellphone 200 is positioned
`in the belt clip 280. In an alternative embodiment, the
`position indicator 290 may be a metallic insert that varies the
`magnetic field of an inductively coupled loop of the belt clip
`sensor 260. It should be noted that other pertinent compo
`nents not shown may be included within the portable cell
`phone 200 without departing from the scope of the present
`invention.
`Turning now to FIG. 3, illustrated is a flow diagram of an
`embodiment of a method, generally designated 300, of
`operating a portable cell phone constructed in accordance
`with the principles of the present invention. The method 300
`starts in a step 305 with an intent to operate a portable cell
`phone.
`Following the step 305, the portable cell phone deter
`mines its location proximate a user in a step 310. In one
`embodiment, the location may be determined by a desig
`nated sensor that indicates the proximity of the portable cell
`phone to a user's head. In alternative embodiments, the
`location may be determined by other sensors including a belt
`clip sensor, a cradle sensor, or a headset sensor.
`After determining proximity to the user, the portable cell
`phone provides a control signal in a step 320. The control
`signal may, for instance, be either a Voltage level or current
`level that is designated to correspond to the previously
`determined location. Those skilled in the pertinent art will
`understand the use of control signals to represent a deter
`mined condition.
`After providing a control signal, the portable cell phone
`determines if the control signal indicates proximity of the
`portable cell phone to the user in a first decisional step 330.
`In one embodiment, various control signals may be desig
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`nated to correspond to different locations of the portable cell
`phone proximate the portable cell phone user. For example,
`one control signal may represent that the portable cellphone
`is in the vicinity of the user's head. Another control signal
`may be used to represent that the portable cell phone is in the
`vicinity of the user's body. In alternative embodiments, the
`control signal may represent that the portable cell phone is
`not within the vicinity of the user's body.
`In the illustrated embodiment, if it is determined that the
`portable cell phone is proximate the user, then the transmit
`power level is reduced as determined by a value of a
`proximity transmit power level, in a step 340. In one
`embodiment, the transmit power level may be reduced to
`one network adjusted transmit power level whenever the
`portable cell phone is within the vicinity of any part of the
`user's body. In another embodiment, the transmit power
`level may be reduced to various allowable proximity trans
`mit power levels depending on the vicinity of the portable
`cell phone to different parts of the user's body.
`After adjusting the transmit power level, the portable cell
`phone then transmits at a reduced level in a step 350. In one
`embodiment, the adjusted transmit power level may not
`exceed the network adjusted transmit power level as deter
`mined by the communications path between the portable cell
`phone and the communications tower. In other embodi
`ments, the adjusted transmit power level may be reduced to
`the proximity transmit power level. Finally, the transmission
`of the portable cell phone ends in a step 370.
`Returning now to the first decisional step 330, if the
`portable cell phone is not proximate the user, then the
`method 300 proceeds to a step 360 wherein the portable cell
`phone transmits at the network adjusted transmit power
`level. In one embodiment, the network adjusted transmit
`power level may equal the maximum transmit power level of
`a portable cell phone. In other embodiments, the network
`adjusted transmit power level may be a reduction from the
`maximum transmit power level due to the communications
`path between the communications tower and the portable
`cell phone. After transmitting in step 370, the method 300
`ends in the previously mentioned step 360.
`Although the present invention has been described in
`detail, those skilled in the art should understand that they can
`make various changes, Substitutions and alterations herein
`without departing from the spirit and scope of the invention
`in its broadest form.
`
`8
`
`What is claimed is:
`1. A portable cell phone, comprising:
`a power circuit that provides a network adjusted transmit
`power level as a function of a position to a communi
`cations tower, and
`a proximity regulation system, including:
`a location sensing Subsystem that determines a location
`of said portable cell phone proximate a user; and
`a power governing Subsystem, coupled to said location
`sensing Subsystem, that determines a proximity
`transmit power level of said portable cell phone
`based on said location and determines a transmit
`power level for said portable cell phone based on
`said network adjusted transmit power level and said
`proximity transmit power level.
`2. The portable cell phone as recited in claim 1 wherein
`said location sensing Subsystem determines said location
`with respect to a portion of a body of said user.
`3. The portable cell phone as recited in claim 1 wherein
`said proximity transmit power level is limited to a prede
`termined maximum level.
`4. The portable cell phone as recited in claim 1 wherein
`said proximity transmit power level is maximum when said
`portable cell phone is operating in a headset operation mode
`or data transfer operation mode.
`5. The portable cell phone as recited in claim 1 wherein
`said portable cell phone is located on a belt-clip of said user.
`6. The portable cell phone as recited in claim 1 wherein
`said location sensing Subsystem or said power governing
`Subsystem is embodied in an integrated circuit.
`7. The portable cell phone as recited in claim 1 wherein
`said proximity transmit power level is reduced to one level
`when said location is within a vicinity of a user's head and
`reduced to a second level when said location is within a
`vicinity of a user's midsection.
`8. The portable cell phone as recited in claim 1 wherein
`said location sensing Subsystem determines said location by
`employing a sensor selected from the group consisting of:
`a designated sensor,
`a contact Sensor,
`a belt clip sensor, and
`a cradle sensor.
`9. The portable cell phone as recited in claim 1 wherein
`said location sensing Subsystem determines said location by
`ascertaining a mode of operation of said portable cellphone.
`
`k
`
`k
`
`k
`
`k
`
`k
`
`10
`
`15
`
`25
`
`30
`
`35
`
`40
`
`45
`
`Case 1:22-cv-22706-RNS Document 1-26 Entered on FLSD Docket 08/25/2022 Page 9 of 9
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`