`
`oo JK Patent Application 10GB a2 285 198 isA
`
`(43) Date of A Publication 28.06.1995
`
`
`(51)
`INT CL®
`(21) Application No 9326169,1
`H040 7/32
`
`(22) Date of Filing 22.12,1993
`
`
`(71) Applicant(s)
`
`Nokia Mobile Phones Limited
`
`
`
`
`
`(74) Agent and/or Addressfor Service
`JM Potter
`Nokia Mobile Phones, Patent Department,
`
`St Georges Court, St Georges Road, CAMBERLEY,
`
` Surrey, GU15 302, United Kingdom
`
`
`(52) UK CL (Edition N)
`H4b L1H10 L1H3
`
`(86) DocumentsCited
`GB 2269723 A GB2262688A GB 2252699A
`GB 2242805 A
`GB 2240696 A
`
`(58)
`
`Field of Search
`UK CL(Edition M) H4K K¥4D14 KY4D14H , H4L LDSD
`LDSX
`INT CL5 HO40 7/04
`ONLINE DATABASE:WPI
`
`(Incorporated in Finland)
`
`P.O. Box 86, SF-24101 Salo, Finland
`
`(72)
`
`Inventor(s)
`John Daniel Byrne
`
`(54) Multi-mode radio telephone
`
`(57) A radio telephone (200)is operable in a cordless telephone system orin a cellular telephone system. The
`telephone(200) incorporatescircuitry to detect user velocity so that whenthe usertravels more quickly the
`telephone automatically transfers from cordless mode, whichis the preferred mode, to cellular mode.
`Alternatively one telephone system or someotherdevice e.g, a car speedometer may determine the velocity
`and transmit velocity information to the radio telephone. This prevents the degeneration in communication
`quality which frequently occurs when a userof a cordless system travels faster than walking pace.
`132
`134
`1
`Fig.1.
`
`
`
`CELLULAR
`STATION
`
`BASE
` CORDLESS
`BASE
`STATION
`
` BASE
`
`STATION
`
`CONTROLLER
`
`
`
`CELLULAR
`SWITCHING
`
`
`
`CENTRE
`CORDLESS _
`
`
`TELEPHONE
`
`COMMUNITY
`
`
`CORDLESS
`
`BASE STATION
`
`
`
`V86lL98¢c¢dD
`
`At least one drawingoriginally filed was informal and the print reproduced here is taken framalaterfiled farmal copy.
`
`This print takes account of replacement documents submitted after the date offiling to enable the application to comply
`with the formal requirements of the Patents Rules 1990.
`
`1
`
`SAMSUNG 1071
`SAMSUNG1071
`SAMSUNG v. SMART MOBILE
`SAMSUNGv. SMART MOBILE
`IPR2022-01004
`IPR2022-01004
`
`1
`
`

`

`132
`1
`NL
`“0
`Fig.1.
`110
`LLCCSCSCSC‘C*‘C*dS
`
`1
`
`134
`
`
`
`CORDLESS
`
`BASE
`STATION
`
`1,16
`
`CORDLESS
`BASE
`
`STATION
`
`CELLULAR
`CORDLESS
`TELEPHONE
`
`
`
`COMMUNITY
`CORDLESS
`BASE STATION
`
`
`
`
`
`CELLULAR
`BASE
`STATION
`
`130
`
`STATION
`CONTROLLER
`
` BASE
`PT]
`
`MOBILE
`SWITCHING
`CENTRE
`
`7
`
`LR
`
`HLR
`
`139
`
`PSTN
`
`17
`
`2
`
`

`

`
`
`
`
`Fig.2. 262 \/C) 261\.228 270~ 288
`
`
`
`ee eae EE SO ES eS 4 BPF
`240
`AB
`260
`250
`77>
`
`
`AUDIO
`
`
`CORDLESS
`B2 SWITCH Bi
`CELLULAR
`
`AtleAUDIO | tas AUDIO
`
`
`
`
`271
`
`BPF
`
`270
`
`BPF
`
`&S
`>
`
`
`
`CELLULAR
`RECEIVER
`
`CELLULAR
`TRANSMITTER
`
`pia
`
`282
`
`210
`
`205
`
`|
`
`CORDLESS
`RECEIVER
`
`CORDLESS
`TRANSMITTER
`
`
`
`201
`
`\
`
`ON/OFF
`
`MEMO
`
`209
`
`SERVICE
`
`AVAILABLE
`REGISTER
`
`211
`CLEAR,
` MICRO-
`PROCESSOR
`
`
`
`3
`
`

`

`Sly
`
` HANDOVER
`
` 300
`
`EVENT
`INDICATOR
`
`302
`
`
`
`
`
`INCREMENT
`
`SELF-RESET
`
`HANDOVER
`
`TIMER (T)
`COUNT N
`
`
`
`
`
`306
`
`
`
`PERFORM
`COMPARE
`N 2N MAX
`
`HANDOVER TO
`N WITH N
`
`MAX
`
`
`MACRO-CELLULAR
` 308
`
`314
`Fig.4.
`
`
`RECEIVER RF
` RF
`
`
`
`AUTOMATIC
`
`GAIN
`DIGITAL
`CONTROL
`316
`SIGNAL
`
`FACE
`
`DSP
`
`4
`
`

`

`Ay
`
`Fig.5.
`318
`
`
`
`RF INTERFACE
`LIMITING
`
`
`IC
`RF
`
`
`
`(INCLUDING A/D)
`RECEIVER
`
`RSSI
`VOLTAGE
`
`Fig.6.
`
`RSS] ESTIMATE
`
`(PEAK OR AVERAGED FOR TDMA SLOT)
`
` AVERAGE
`
`
`RSS|
`OVER
`WINDOW T
`
`IS RSSI DIFF>THRESHOLD
`
`
`PERFORM
`332
`INTER-
`
`
`SYSTEM
`
`
`HANDOVER
`
` (RESULT IS RSSI AV 0)
`(RESULT IS RSS! 1 DIFF)
`
`
`
`
`
`
`
`
`
` RSSI AV-1=
`RSS! AV 0
`-RSS| AV-1
`RSS! AV 0;
`
`RSSI AV g=0
`
`5
`
`

`

`2285198
`
`TITLE: MULTI-MODB RADIO TELEPHONE
`
`The present invention relates to a radio telephone, and in
`particular to a radio telephone operable in more than one
`system and to a method of operating such a radio
`
`telephone.
`
`Over the last ten years there has been a rapid growth in
`
`radio telephone systems.
`the use and availability of
`part of this growth there has been a proliferation of
`different types of radio telephone system, offering the
`user a variety of services, geographical coverage and
`cost. Many of these different radio telephone systems
`cover the same, or a part of the same, geographical area
`as each other.
`
`Ags
`
`Typically, different radio systems operate on different
`radio frequencies, utilise different modulation
`techniques, signalling technigues and intra-system
`protocols ete.
`to each other.
`Thus,
`a radio telephone
`Gesigned for one system is generally unable to be used on
`another system.
`Thus if a user wishes to have access to
`more than one system it is necessary to have either more
`than cone radio telephone or a radio telephone capable of
`operating in mere than one system, Having more than one
`radio telephone is inconvenient for the user.
`Known radio
`
`telephones capable of operating in more than one system
`typically consist of little more than two separate
`
`6
`
`

`

`~2-
`
`The preference
`telephones combined in a’single housing.
`for operating in a particular system is user defined as
`disclosed in US Patent Ne 4 989 230.
`,
`
`A particularly useful and appropriate environment for
`multi-mode radio telephones is the recently available
`cellular and cordless telephone systems.
`In the prior
`art, cordless telephones are typically used in the home
`and office to allow the user to place and receive calis at
`any point throughout the house via an RF link with a home
`base station located within the house or office.
`Such
`
`cordless telephones are connected via the home base
`station to the user's telephone landline which is in turn
`connected to the Public Switched Telephone Network (PSTN).
`Further,
`there are known second generation cordless
`telephone systems such as CT-2 or BDECT which are digital
`systems.
`Such CT-2 or DECT systems extend beyond
`conventional domestic operation of cordless telephones by
`allowing the user to establish an RF link between a CT-2
`or DECT radio telephone and a base station in a more
`publicly accessible location, eg outside the user's home,
`a railway station, shopping mall or airport.
`Such base
`stations are known as telepoint base stations and are
`linked to the PSTN in much the same way as a home base
`Station.
`Some cordless (and in particular DECT)
`radio
`telephones, are now able to receive calls via telepoint
`base stations whereas hitherto they were only able to
`place them,
`A description of such a system can be found
`in PCT International Patent Application WO 92/03006.
`Thus, placing and receiving calls whilst geographically
`roaming is possible in cordless telephone systems.
`
`However, cordless telephone systems are generally low
`power systems and each base station provides
`
`7
`
`

`

`telecommunications within only approximately a 150 metre radius of the base station,
`dependent upon the terrain and any man-made objects which could interfere with
`signalling between a cordless telephone handset and the base station. Such systems
`are generally only used in areas of high user density and thus tend to be limited to
`urban areas. This clearly restricts the geographical mobility of a CT-2, DECTor the
`
`like cordless telephone user.
`
`In the prior art there are knownso-called cellular radio telephone systems having base
`stations which cover a wide geographical area (cell), eg 35km diameter. However,
`
`in urban areas where the user density is high the cells are much smaller and operate
`
`at lower powersto facilitate frequency re-use thereby increasing the communication
`
`channel density.
`
`Cellular systems have advantages over cordless systems since they allow a user to
`
`place and receive calls over a large area. Additionally they are suitable for use in
`
`moving vehicles. This is because cellular telephone systems have sophisticated
`
`handover procedures to facilitate switching between cells as a user’s vehicle crosses
`
`from one cell to another. This ensures continuity of service and is particularly
`
`important during a call. However,the cost of a cellular telephonecall is significantly
`
`greater than the cost of a cordless telephone call, since cordless telephone calls are
`
`made by way of the user’s land line PSTN link and cost the same as landlinecalls,
`
`whilst cellular telephone calls are made by way of expensive cellular base stations and
`
`cellular switching equipment and cost much morethan land line telephonecalls.
`
`8
`
`

`

`In order for a user to be ableto utilise both cellular and cordless telephone systems
`via a single radio telephone handset a so-called cellular cordless telephone (CCT) has
`been proposed in US Patent US 4 989 230.
`
`Microcellular/cordless communication systems such as DECT are designed for users
`who are either static or moving at a walking speed. If the user of a mobile terminal
`
`(eg a transportable telephone or a portable handset) starts to move faster than these
`
`speeds, the communication quality is much reduced due to the following factors:
`
`i)
`
`The terminal must perform a large number of handovers.
`
`ii)|Channel selection algorithms may operate at too slow a rate and
`
`communication outages and sub-optimal channel selections occur.
`
`iii)
`
`The user will very likely move quickly outside the microcellular
`
`coverage area,
`
`As can be seen, due to the large number of handovers required, the activity of the
`
`network is also higher and so the network capacity is also reduced.
`
`The invention aims to provide a multi-mode radio telephone, and a method of
`
`operation, in which user velocity is taken into account in automatic selection of
`
`telephone system.
`
`According to one aspect of the invention there is provided a radio telephone operative
`
`in at least two radio telephone systems, the radio telephone comprising communication
`
`means respectively associated with each ofthe radio telephone systems, sensing means
`for sensing the velocity of movementof the radio telephone andselection means
`
`9
`
`

`

`-5-
`
`responsive to the sensing means for selecting one of respective said communication
`meansfor the said telephone systems in dependence, wholly or partially, on the sensed
`
`velocity.
`
`Preferably, the telephone systems are a micro-cellular telephone system and a macro-
`cellular telephone system respectively, the selection meansselecting the micro-cellular
`system when the velocity is low and the macro-cellular system when the velocity is
`high.
`
`In one embodiment, the sensing means are operative to sense velocity by sensing the
`
`rate at which the radio telephone moves across cell boundaries.
`
`In another embodimentthe sensing means are operative to sense velocity by sensing
`
`the Dopplershift (ie change of frequency) imparted to the signal received by the radio
`
`telephone as a consequence of the movementof the radio telephone. This method is
`
`probably most appropriate to systems using a large degree of digital signal processing
`
`which can calculate the main Doppler component quite accurately. The method
`selected must be careful not to mistake terminal/network frequency differences as
`
`Dopplershift.
`
`In a further embodiment, the selection means are operative to determine the variation
`
`in strength of a signal received by the radio terminal, in order to sense user velocity.
`
`10
`
`10
`
`

`

`-~6-
`The sensing means and the selection means may be
`incorporated in a mobile terminal
`(eg a transportable
`telephone or a portable handset) operative in the two
`systems, although it is possible for the sensing means and
`selection means to be incorporated in a base station or in
`a network associated with one or other telephone system.
`In this case the network may detect user velocity from the
`rate of change of
`location area or rate of handover,
`The
`network may then either command the terminal to change to
`the macro-cellular system or advise the terminal of its
`
`to make the
`detected velocity, enabling the terminal
`decision about system change over.
`In this latter case,
`the sensing means are in the network and the selection
`means in the telephone.
`
`If a terminal is connected to some other device which ie
`
`capable of measuring user velocity, this device can supply
`velocity information to the terminal.
`Examples of the
`types of device are:
`inertial navigation unit, satellite
`navigation system (GPS),
`local radio navigation system,
`car speedometer. This other device can be part of the
`terminal equipment or connected in some other way.
`
`the invention there is
`According to another aspect of
`provided a method of cperating a radio telephone operative
`in at least two radio telephone systems, comprising
`selecting a said radio telephone system in dependence,
`wholly or partially, on the valocity of movement of the
`radio telephone.
`
`the invention will now be
`Specific embodiments of
`described, by way of example, with reference to the
`accompanying drawings,
`in whichs
`
`11
`
`11
`
`

`

`-7-
`
`Figure 1 is a block diagram of two telephone systems (one cellular and the other
`cordless) and a cellular cordless telephone according to the invention,
`
`Figure 2 is a block diagram of the cellular cordless telephone of Figure 1,
`
`Figure 3 is a block diagram illustrating an algorithm for determining user velocity
`
`from the number of handovers,
`
`Figures 4 and § show block diagrams of two alternative ways of detecting received
`
`signal strength intensity, and
`
`Figure 6 is a block circuit diagram of a circuit showing how the rate of change of
`
`received signal strength intensity can be used to provide a measure of user velocity.
`
`Figure 1 illustrates a block diagram of cellular and cordless telephone systems 100
`
`with either of which a cellular cordless telephone 200 can communicate.
`
`In practice
`
`there will be a plurality of telephones 200. The systems include a Public Switched
`
`Telephone Network (PSTN) 117, connected by landlines to cordless basestations 114,
`
`116 and 118 having respective landline telephone numbers and respectively located in
`
`an office building 110, domestic residence 120 and some other geographical location.
`
`The cordless base stations 114, 116 and 118 communicate with the cellular cordless
`telephone (CCT) 200 via respective antennas 112, 119 and 122. The antennas 112,
`119 and 122 may be implemented as any sort of suitable antenna such as a whip
`
`12
`
`12
`
`

`

`antenna or (printed) helical antenna. The cordless base stations 114 and 116 may be
`conventional cordless base stations. A cordless base station 118 is a community
`cordless base station and such base stations may be located throughout an urban area,
`
`or commonuser area such as a railway station, shopping mall or airport, for providing
`
`a shared telephoneservice to CCTs 200. In suchacase, the cordless basestation 118
`may include additional equipment not usually found in conventional cordless base
`
`stations for billing calls to a telephone number of the CCT 200.
`
`Also connected through telephone landlines to the PSTN 117 is the mobile switching
`
`centre (MSC) 138 associated with Base station controller(s) (BSC) 136 for controlling
`
`a cellular base station(s) 130. The cellular base station 130 comprises both a receive
`
`antenna 132 and a transmit antenna 134 for communicating with CCTs 200.
`
`The CCT 200 may be a mobile unit installed in a vehicle, a so called transportable
`unit, or a hand-held portable unit. The CCT 200 comprises an antenna 228 for
`
`cordless communication and an antenna 238 for cellular communication. The CCT
`
`200 may alternatively comprise a single antenna 238 for both cellular and cordless
`
`communication and arranged as illustrated in Figure 2 by the dotted line 272.
`Typically in the UK cordless telephone systems operate in frequency bands at 49 MHz
`(CT0), 860 MHz (CT2) and 1880-1900 (DECT) and cellular telephone systems in
`frequency bands 890-905 MHz and 935-950 MHz (TACS), 905-915 MHz and 950-960
`MHz (GSM) or 1800 MHz (DCS).
`
`Figure 2 illustrates a detailed block diagram of an embodiment of a CCT 200 in
`
`accordance with the present invention. The CCT 200 comprises a cellular telephone
`
`transceiver 230 and antenna 238, a cordless telephone transceiver 220 and antenna
`
`13
`
`13
`
`

`

`228, a microprocessor 210, keypad 201, display 205, audio switch 260, microphone
`261 and speaker 262. The microphone 261, speaker 262 and keypad 201 may
`alternatively be located in a handset separate from the rest of the CCT 200. An
`alternative embodiment is shown by dashed line 272, in which cordless transceiver 220
`and cellular transceiver 230 may be coupled to a single antenna 238 by way of band
`pass filter (BPF) 270 and a bandpassfilter (BPF) 271, respectively. The cordless
`telephone transceiver 220 may be any conventional cordless transceiver. However,
`it would be advantageous if the cordless telephone transceiver 220 conformed to a
`
`commonair interface for cordless telephones, since this would facilitate roaming of
`
`the CCT 200 between different cordless systems. The cellular transceiver 230 may
`
`likewise be any conventional cellular transceiver. The keypad 201, microprocessor
`
`210, display 205 and the like can be any available type, connected and arranged to
`
`operate in the CCT 200. The microprocessor 210 includes a Service Available
`
`Register (SAR) 221 for storing which radio systems are currently available to the CCT
`
`200.
`
`Whenoperating as a cordless telephone control signals from the microprocessor 210
`
`enable cordless receiver 221 and cordless transmitter 222. The microprocessor 210
`
`also monitors signals from the cordless receiver 221,
`
`indicating received signal
`
`strength and for detecting receive data, and from the cordless transmitter 222 for
`
`sending transmit data. Additionally, the microprocessor 210 monitors control signals
`
`from the
`
`cordless
`
`transceiver 220 for detecting incoming calls
`
`(ringing),
`
`security codes and
`
`broadcast
`
`information relevant
`
`to the
`
`cordless
`
`system,
`
`14
`
`14
`
`

`

`and for sending dialling: information.
`
`- 10 -
`
`The microprocessor 210 controls the CCT 200 in a similar
`way when operating as a cellular telephone, but
`appropriately modified for the signalling protocols and
`data encryption used in the cellular system.
`The
`signalling protocols, data encryption techniques and the
`like used in repective telephone systems, are well known
`in the art, and the microprocessor can be arranged to
`operate in a known manner
`to effect control of the signals
`in such systems.
`
`The audio switch 260 is controlled by the microprocessor
`210 to link the cordless audlo channel 240 or the cellular
`
`audio channel 250 to the microphone 261 and loudspeaker
`
`262 as appropriate.
`
`In the present invention, user velocity is the eriterion
`for selecting operation of
`the telephone 200 in either
`cellular or cordless mode.
`It will be appreciated that
`other criteria may additionally be used,
`the various
`criteria being accorded levels of
`importance or
`"weightings" dependent on the extent to which the criteria
`are to influence a final decision. These criterla and
`
`their weightings may be fixed or may be dynamically
`variable in dependence upon the performance of
`the
`telephone 200.
`
`the telephone 200 will cross cell
`When the user moves,
`boundaries, and hence the rate of eceurrence of handovers
`
`from one cell to an adjacent cell will be representative
`of user velocity.
`
`Figure 3 shows in block diagram form the algorithm which
`
`15
`
`15
`
`

`

`-~41-
`
`handoverratetobedetermined.A handover event detector
`
`
`300 senses the occurrence of each handover or attempted
`handover.
`A counter 302 counts the number of handovers in
`& pre-selected time IT,
`the counter 302 being reset by a
`timer 304.
`The count accumulated in the counter 302 in
`the predetermined time T is compared,
`in a comparator 306,
`with a stored threshold count N max.Ifthecountinthe
`
`telephone 200 must first detect RSSI.
`
`For this,
`
`the
`
`and supplies signals to a radio
`frequency interface 312 which in turn supplies in phase
`{I} and quadrature phase (Q) signais to a digital signal
`processor 314.
`The digital signal processor 314 produces
`digital signals which are fed back by an automatic gain
`control feedback loop 316 to the receiver 310.
`A measure
`of RSSI is computed From a knowledge of
`the adjustable
`gain setting in the feedback loop 316 and from a
`the
`calculation of power, corresponding to the sum of
`squares of
`the in phase and guadrature signals,
`ie 1¢ +
`0,
`
`16
`
`

`

`-12-
`
`the RF receiver 310 and RF
`Relating Figure 4 to Figure 2,
`interface 312 will be ineluded in the cordless and -
`cellular transceiver 220, 230 and the digital signal
`processor 314 will be included in the microprocessor 210.
`
`Figure 5 shows an alternative way of detecting RSSI using
`a non-linear receiver 316 which supplies to a radio
`frequency interface 318 a signal 320 representative of the
`signal received by the antenna and a secand signal 322
`representative of RSSI voltage.
`The RF interface 318
`includes an analogue to digital converter and this is used
`to digitise the RSSI voltage from the limiting receiver.
`
`Raving obtained a signal representative of RSSI by Figure
`
`the rate of change of RSSI can be detected
`4 or Figure 5,
`by a circuit adopted to operate in accordance with the
`flowchart shown in Figure 6.
`A signal representative of
`the RSSI detection is fed to an averaging circuit at block
`324 which averages the RSSI signal over a window of
`time
`T, producing the signal RSSI AV 0.
`‘The output from the
`averaging circuit obtained at block 324 is fed to a part
`of the circuit corresponding to decision block 326 which
`decides if the time T has expired.
`If it has not, branch
`N is taken and the system re-sets.
`If time T has expired,
`branch Y is taken and the RSSI AV 0 siqnal has subtracted
`From it,
`in a subtractor at block 328,
`the previous signal
`RSST AV-1,
`The output of
`the subtractor at block 328 is a
`aifference signal RSSI DIFF which is supplied to a circuit
`implementing decision block 330 which determines if RSSI
`DIFF is greater than a predetermined threshold.
`If it is
`not, branch N dis
`taken and the system re-sets.
`If the
`decision taken at block 330 is YES system changeover is
`initiated, as indicated by block 332.
`
`17
`
`17
`
`

`

`-13-
`
`the described embodiment of the invention relies on
`Thus,
`user velocity to influence mode selection in a dual mode
`terminal.
`
`The dual mode terminal consists of two modes:
`
`i) Micro-cellular - useful whilst stationary and at
`
`walking pace,
`
`ii) Maero-cellular - useful whilst stationary,
`walking and travelling at vehicular speeds.
`
`the user starts moving
`iff
`in micro~-cellular mode,
`Whilst
`quickly the terminal selects the macro-cellular mode to
`prevent degradation of service. Furthermore calis on the
`micro~cellular system should not be initiated whilst
`travelling at speed.
`
`This concept may be possibly widened from micro/macro
`cellular to a dual mode cellular/satellite system in
`airborne applications,
`in this case the satellite system
`becoming the macro system and the cellular the micro
`
`system.
`
`18
`
`18
`
`

`

`- 14-
`
`CLAIES
`
`A radio telephone operative in at least two radio
`1.
`telephone systems,
`the radio telephone comprising
`communication means respectively associated with each of
`the radio telephone systems, sensing means for sensing the
`velocity of movement of the radio telephone and selection
`means responsive to the sensing means for selecting one of
`reapective said communication means for the said telephone
`systems in dependence, wholiy or partially, on the sensed
`velocity.
`
`A radio telephone according to claim 1, wherein the
`2.
`telephone systems are a micro-cellular telephone system
`and a macro-cellular telephone system reepectively,
`the
`selection means sclecting the micro~cellular system when
`the velocity is low and the macro-cellular system when the
`velocity js high.
`
`<A raGio telephone according to claim 2, wherein the
`3.
`sensing means are operative to sense velocity by sensing
`the rate at which the radio telephone moves across cel
`boundaries.
`
`4.
`
`3B radio telephone according to claim 3, wherein said
`
`rate is sensed by sensing the rate at which handover
`events, or attempted handover events, occur, a handover
`
`19
`
`19
`
`

`

`- 16 -
`
`event being the transference of a radio telephone from one
`cell to an adjacent cell in the same telephone system.
`
`A radio telephone according to claim 3 or 4, wherein
`5.
`the selection means comprise storage means having stored
`therein a threshold handover count, comparator means for
`comparing a prevailing handover count with the threshold
`count,
`the selection means being operative to initiate
`changeover from the micro-celluler system to the macro-
`cellular system if the prevailing count exceeds the
`threshold count.
`
`A radio telephone according to claim 2, wherein the
`6.
`sensing means are operative to sense velocity by sensing
`the Doppler shift imparted to the signal received by the
`telephone as a consequence of the movement of the
`telephone.
`
`AB radio telephone according to claim 2, wherein the
`7.
`telephone systems have networks with which the telephone
`communicates and at least one network has means for
`
`detecting radio telephone velocity and for transmitting
`information regarding said velocity to the radilo
`telephone.
`
`A radio telephone according to claim 2, wherein the
`8,
`selection means are operative to determine the variation
`in strength of a signal received by the radio telephone,
`in order to sense user velocity.
`
`A radio telephone according to claim &, wherein the
`9.
`selection means determine the rate of change with time of
`the strength of
`the received signal,
`in order to sense
`user velocity.
`
`20
`
`20
`
`

`

`- 16 -
`
`10, A radio telephone according to claim 9, wherein the
`selection means comprise averaging means operative to
`determine average values of the received signal over
`successive predetermined time intervals, difference means
`operative to compare the averaged value with a preceding
`averaged value to determine a difference value, comparator
`means operative to compare the difference with a
`predetermined difference and to initiate transfer to the
`macro-cellular system if the prevailing difference value
`exceeds the predetermined difference value by more than a
`predetermined threshold.
`
`11. A radio telephone constructed and arranged
`substantially as herein particularly deseribed with
`reference to any one of the embodiments illustrated in the
`accompanying drawings.
`
`In combination, a micro-cellular telephone system, a
`12.
`macro-cellular telephone system and at least one radio
`telephone capable of operating in either system,
`the
`combination comprising sensing means for sensing the
`velocity of movement of the radio telephone and selection
`means responsive to the sensing means for automatically
`selecting the macro-cellular telephone system when the
`velocity of the radio telephone exceeds a threshold.
`
`two telephone systems and a radio
`13. The combination of
`telephone, substantially as herein particularly described
`with reference to any one of the embodiments shown in the
`accompanying drawings.
`
`14. A method of operating a radio telephone operative in
`at least two radio telephone systems, comprising selecting
`
`21
`
`21
`
`

`

`-19 -
`
`a said radio telephonesystem in dependence, wholly or
`partially, on the velocity of movement of the radio
`telephone.
`,
`
`15, A method according to claim i4, wherein the telephone
`systems are a micro-cellular telephone system and & macro-
`cellular telephone system respectively,
`the micro-cellular
`system being selected when the velocity is low and the
`macro-cellular system being selected when the velocity is
`high.
`
`16. A method according to claim 15, wherein the velocity
`of movement is determined by sensing the rate at which the
`radio telephone moves across cell boundaries.
`
`17. A method according to claim 15, wherein the velocity
`of movement
`is determined by sensing the Doppler shift
`imparted to the signal
`received by the radio telephone as
`a conseguence of the movement of the radio telephone.
`
`18. A method according to claim 15, wherein the telephone
`systems have networks with which the radio telephone
`communicates, and at least one network detects radio
`
`telephone velocity and transmits information regarding
`said velocity to the radio telephone.
`
`19. A method of operating a radio telephone operative in
`at least two radio telephone systems, substantially as
`herein particularly described with reference to any one of
`the embodiments shown in the accompanying drawings.
`
`22
`
`22
`
`

`

`Application number
`GB 9326169.1
`
`Patents Act 1977
`
`Examiner’s report to the Comptroller under fon 17
`The Search report)
`-107
`
`Relevant Technical Fields
`
`Gi) UK Cl (Ed.M)
`
`—-H4L (LDSD AND LDSX); H4K (KY4D14,
`KY4D14H)
`
`(ii) Int Cl (Ed.5)
`
`H04Q 7/04
`
`Databases (see below)
`(i) UK Patent Office collections of GB, EP, WO and USpatent
`specifications.
`
`
`
`
`Search Examiner
`
`KEN LONG
`
`
`
`
`Date of completion of Search
`29 MARCH 1994
`
`
`Documents considered relevant
`
`following a search in respect of
`Claims :-
`
`1-19
`(ii) ONLINE DATABASE: WPI
`
`Categories of documents
`
`X:
`
`Y:
`
`A:
`
`Documentindicating lack of novelty or of inventive step.
`
`Documentindicating lack of inventive step if combined with
`one or more other documents of the same category.
`
`P:
`
`E:
`
`Document published on or after the declared priority date
`but before the filing date of the present application.
`
`Patent documentpublished on or after, but with priority date
`earlier than, the filing date of the present application.
`
`Document indicating technological background and/orstate
`ofthe art.
`
`&:
`
`Memberofthe samepatent family; corresponding document.
`
`Category
`
`Identity of document and relevant passages
`
`Y
`
`X,Y
`
`GB 2252699 A
`
`(MATSUSHITA) See particularly page 4 lines 8-20
`and page 6 lines 8-13
`
`Relevant to
`claim(s)
`
`6 and 17
`
`X: 1, 2, 12,
`14 and 15
`Y: 6, 8, 9
`and 17
`
`
`
`
`
`
`(SOCIETE D) See particularly page 4 lines 6-18 and
`GB 2269723 A
`X: 1, 2, 12,
`
`14 and 15
`page 5 lines 5-8
`¥: 6, 8,9
`
`and 17
`
`
`
`GB 2262688 A
`(L M ERICSSON) See particularly page 1
`
`
`lines 22-26 and page 2 line 30 to page 3 line 21
`
`
`
`
`
`
`xY (STC) See particularly page 4 lines 24-32 and page 5|X: 1, 2, 12,GB 2242805 A
`
`lines 2-9
`14 and 15
`
`
`Y: 6, 8, 9
`and 17
`
`
`GB 2240696 A
`(NEC) See particularly page 1 lines 12-20
`
`
`
`Y
`
`8 and 9
`
`Databases:The UK Patent Office database comprisesclassified collections of GB. EP, WO and US patent specifications as outlined periodically in the Official Journal
`(Patents). The on-line databases considered for search are alsolisted periodically in the Official Journal (Patents).
`
`T8 - 5587
`
`23
`
`Page | of 1
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`