United States Patent 15
`Pillekamp
`
`5,594,737
`(11] Patent Number:
`[45] Date of Patent:
`Jan. 14, 1997
`
`
`
`|800040008
`
`[54] ARRANGEMENT FOR CONTROLLING A
`TRANSMITTING/RECEIVING DEVICE OF
`BASE STATIONS AND/OR MOBILE UNITS,
`IN PARTICULAR OF A CORDLESS
`TELEPHONE SYSTEM
`
`[75]
`
`Inventor: Klaus-Dieter Pillekamp, Erkrath,
`Germany
`
`[73] Assignee: Siemens Aktiengesellschaft, Munich,
`Germany
`
`[21] Appl. No.:
`
`424,275
`
`[22] PCT Filed:
`
`Nov. 2, 1993
`
`{86] PCT No.:
`
`PCT/DE93/01045
`
`§ 371 Date:
`
`Apr. 28, 1995
`
`§ 102(e) Date: Apr. 28, 1995
`
`(87] PCT Pub. No.: WO94/10812
`
`PCT Pub. Date: May 11, 1994
`
`[30]
`
`Foreign Application Priority Data
`
`10/1993 Davis et al. cecseccsseucsseunee 455/38.3
`5,251,325
`11/1993 Tomabechi ceececsersevsesssceeen 370/95.1
`5,260,944
`
`
`1/1994 Binzel et al.
`.
`ee 370/953
`5,278,832
`
`2/1996 TaMemra scesecscvsrssereeeseneeeee 455/127
`5,493,705
`4/1996 Tiedemann...
`seusnuaeee 370/953
`5,509,015
`seccccscsscssnrsneseesneeres 455/38.3
`3/1996 Yahagi
`5,517,679
`FOREIGN PATENT DOCUMENTS
`
`2670968
`2249922
`WO09213395
`
`,
`France .
`6/1992
`5/1992 United Kingdom .
`8/1992 WIPO.
`
`OTHER PUBLICATIONS
`
`“Auch ohne Schnur auf Draht”, Wolf, Telcom report 10
`(1987), Heft 2, pp. 130-137. German.
`“Digital European Cordless Telecommunications System”
`(DECT) Standard (draft prETS 300 175-3) (1991), pp.
`1-177.
`“Digital European Cordless Telecommunications System”
`(DECT) Standard (draft prETS 300 175-2) (1991), pp.
`1-36.
`
`Primary Examiner—Douglas W. Olms
`Assistant Examiner—Matthew C. Phillips
`Attorney, Agent, or Firm—Hill, Steadman & Simpson
`
`Nov. 2, 1992
`
`[DE]
`
`Germany ......ce eseseessseaes 9214886 U
`
`[57]
`
`ABSTRACT
`
`[ST] Unt. C19 onceccesssnseensssceseee H04J 3/16; HO4M 11/00
`[52] U.S. Ch oeseessseeeesees 370/278; 370/280; 370/337;
`379/61; 455/38.3
`[58] Field of Search oo.ees 455/38.3, 127,
`455/343; 370/95.3, 80, 29, 95.1, 32, 85.8,
`95.2; 379/61
`
`[56]
`
`References Cited
`U.S. PATENT DOCUMENTS
`
`To be able to operate base stations (FT) and mobile units
`(PT) of a cordless telephone system with the lowest possible
`use of energy, a processor (M-CT)of the base station (FT)
`and of the mobile unit (PT) contains a controlling program
`(CP) which is designed in such a way that the transmitting
`device (RE-T) of a transmitting unit (FT, PT) is activated
`essentially only at transmission times (SZ) and the receiving
`device (RE-R) of a receiving unit (PT, FT) is activated
`essentially only at reception times (EZ).
`
`5,196,806
`
`3/1993 Ichihara ......scseesssesoeseresseesees 330/137
`
`8 Claims, 3 Drawing Sheets
`
`FIELD STRENGTH
`MEASURING DEVICE
`
`PERIPHERAL
`ELEMENTS
`
`
`
`
`
`CONTROLLING ELEMENT
`
` —.—.)
`
`
`
`1
`
`SAMSUNG 1009
`
`SAMSUNG 1009
`
`1
`
`

`

`U.S. Patent
`
`Jan. 14, 1997
`
`Sheet 1 of 3
`
`5,594,737
`
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`

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`U.S. Patent
`
`Jan. 14, 1997
`
`Sheet 2 of 3
`
`5,594,737
`
`
`
`RE, RE-T,RE-R
`
`RE-I
`
`FIG 3
`
`PT——fT§FI——PT
`(FT——PT)
`|
`(PT—=FT)
`10ms
`
`a ~
`
`~ ~
`
`~~ ~
`
`~UI7us
`/-—_—— 420 Bit —_—_+
`
`6s4[-—-85s—§$_]565
`
`3
`
`

`

`U.S. Patent
`
`Jan. 14, 1997
`
`Sheet 3 of 3
`
`FIG &
`
`I
`L
`
`RE-T,RE-R
`RSSI,RE-I,
`DST/R-S,PA
`
`PT—~ FT
`FT —> PT
`(FT —~ PT}
`(PT —= FT]
`TOMA- FRAME (10 ms)
`
`i
`
`EZes
`| UEEP
`UESP*1
`mi
`
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`

`5,594,737
`
`1
`ARRANGEMENT FOR CONTROLLING A
`TRANSMITTING/RECEIVING DEVICE OF
`BASE STATIONS AND/OR MOBILEUNITS,
`IN PARTICULAR OF A CORDLESS
`TELEPHONE SYSTEM
`
`BACKGROUND OF THE INVENTION
`
`The invention relates to an arrangementfor controlling a
`transmitting/receiving device of base stations and/or mobile
`units in particular of a cordless telephone system.
`Cordless telephone systems, for example systems based
`on the TDMAprinciple (Time Division Multiple Access)
`(for example DECTcordless system, CT2 cordless system
`etc.) and systems based on the CDMAprinciple (Code
`Divisoin Multiple Access), may be designed in such a way
`- that voice to be transmitted is compressed on the transmis-
`sion side, is transmitted by the transmitting device of the
`transmitting unit (base station, mobile unit) within a radio
`link, is received by the receiving device of the receiving unit
`(mobile unit, base station) and is expandeed (burst tech-
`nique).
`Great Britain reference GB-A-2 249 922 (corresponding
`to U.S. Pat. No. 5,260,944) discloses, for example, a mobile
`TDMAradio telecommunication system which has the char-
`acteristics mentioned above.
`
`SUMMARYOF THE INVENTION
`
`The object on which the invention is based consists in
`operating base stations and/or mobile units, in particular of
`a cordless telephone system, with the lowest possible use of
`energy.
`The present invention is an arrangementfor controlling a
`transmitting/ receiving device of base stations and/or mobile
`units, in particular of a cordless telephone system, compris-
`ing: each ofthe base stations and the mobile units having a
`processor, to which a controlling program is assigned and
`voice to be transmitted being compressed on a transmission
`' side, transmitted by a transmitting device of a first trans-
`mitting/receiving device within a radio link and received by
`areceiving device of a second transmitting/receiving device
`and expanded;the controlling program effecting actuation of
`the transmitting device of the transmitting unit substantially
`only during fixed, predetermined transmission times within
`a transmission time frame and effecting actuation of the
`receiving device of the receiving unit substantially only
`during fixed, predetermined reception times within the trans-
`mission time frame; modules for monitoring that determines
`the transmission time frame, the modules being excepted
`from the time-related activation.
`in
`In the case of base stations and/or mobile units,
`particular a cordless telephone system, in order to reduce the
`use of energy required for the operation of the base station
`and/or of the mobile unit with the exception of the modules
`necessary for frame-clock monitoring (e.g. in a transmitting/
`receiving device of the base station and/or of the mobile
`unit)—in particular whenever the devices are supplied sta-
`tionarily, for example via a battery, the transmitting/receiv-
`ing device is switched on with a certain time lead with
`respect to the transmission/reception burst (FIG. 4) occur-
`ring at periodic time intervals in the transmission technique
`(for example TDMA or CDMA methods). The lead time
`may in this case comprise a first part-lead time and a second
`part-lead time, the first part-lead time being understood as
`meaning the running up time required by the electronic
`components of the transmitting/receiving device from the
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`switching-on instant to the beginning of the transmission/
`reception burst and the second part-lead time being under-
`stood as meaning the time which ensures that the transmit-
`ting/receiving device is activated during the transmission/
`reception burst.
`In order that
`the transmitting/receiving
`device is also switched on over the entire duration of the
`transmission/reception burst,
`the
`transmitting/receiving
`device is switched off with the end of the transmission/
`reception burst. In this case, as with the switching onof the
`transmitting/receiving device—in analogy with the second
`part-lead time provided there—it is also possible to provide
`a corresponding part-lag time for the switching off of the
`transmitting/receiving device, in order to ensure that the
`transmitting/receiving device is also switched on during the
`entire duration of the transmission/reception burst.
`Advantageous further developments of the invention are
`specified in the subclaims.
`the
`invention,
`In further embodiments of the present
`transmitting/receiving device contains on the one hand a
`plurality of subdevices (central functions), such as for
`example switching devices, an amplifier and an interface,
`and on the other hand a transmitter and receiver, which are
`switched on and off simultaneously in one embodiment and
`at different times in another embodiment.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`The features of the present invention which are believed
`to be novel, are set forth with particularity in the appended
`claims. The invention, together with further objects and
`advantages, may best be understood by reference to the
`following description taken in conjunction with the accom-
`panying drawings,
`in the several Figures of which like
`reference numerals identify like elements, and in which:
`FIG. 1 shows an arrangement for controlling a transmit-
`ting/receiving device in a basestation or a mobile unit of a
`cordless telephone system,
`FIG. 2 showsthe basic construction of the transmitting/
`teceiving device according to FIG. 1,
`FIG. 3 shows a TDMAtimeframein a cordless telephone
`system in accordance with the DECTstandard,
`FIG. 4 showsthe time relationship between transmission
`and reception burst and the activation of the transmitting/
`receiving device according to FIGS. 1 and 2.
`
`DESCRIPTION OF THE PREFERRED
`EMBODIMENTS
`
`FIG. 1 showsthe basic circuitry of a base station FT or of
`a mobile unit PT of a cordless telephone system. Both the
`base station FT and the mobile unit PT contain a radio
`element RE - in the following also referred to as transmit-
`ting/receiving device RE-T, RE-R —,a controlling element
`CEandperipheral elements PE, which are combinedin the
`“peripheral elements” functional block. In the following
`description, it is assumed that for the cordless telephone
`system the DECT standard (Digital European Cordless
`Telecommunication) is implemented. However, the inven-
`tion is not restricted to this. For instance, the invention can
`also be readily used for comparable standards, such as for
`example the CT2 or GSM standard.
`While base station FT and mobile unit PT do not differ
`with respect to the controlling element CE and the radio
`element RE or the transmitting/receiving device RE-T, RE-
`R—to the extent to which consideration is relevant for the
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`5,594,737
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`3
`invention —, the peripheral elements PE ofthe base station
`FT and of the mobile unit PT are differently designed.
`For instance, the peripheral elements PE in the case of the
`base station FI—on the basis of base stations of known
`cordless telephone systems (Wolf, Klahs: “Auch ohne
`Schnur “auf Draht’””’ [“Keeping in touch” even without a
`cord], Telcom Report 10, 1987, Issue 2, pages 130 et seq.,
`for example page 134)—comprise for example internal
`subscriber circuits or exchange or PBX circuits with
`upstream ADPCM encoding/decoding devices and an inter-
`nal peripheral controller, while in the peripheral elements PE
`of the mobile unit PT—on the basis of mobile units of
`knowncordless telephone systems (Telcom Report 10, 1987,
`Issue 2, page 135)—there are contained for example a
`microphone, a piezo receiver capsule, a piezo ringer, a
`storage battery, a keypad, an LED display, and also VF and
`ringer amplifiers.
`The abovementioned peripheral elements PE of the base
`station FT and of the mobile unit PT mayalso be substituted
`by other elements without in any way restricting the inven-
`tion.
`
`The elementsofthe circuitry of the base station FT and of
`the mobile unit PT according to FIG. 1 which are relevant
`for the invention are the radio element RE or the transmit-
`ting/receiving device RE-T, RE-R and the controlling ele-
`ment CE. Assigned in this case to the radio element RE, for
`the transmission and reception of radio signals (for example
`TDMA or CDMAradio signals) are two antennas Al, A2,
`which act both as a transmitting and a receiving antenna.
`Alternatively, however,it is also possible without in any way
`restricting the invention to assign one antenna or more than
`two antennas to the radio element RE.
`
`The radio element RE has furthermore—asrepresented in
`FIG. 1 by three functional blocks—atransceiverT,R,a field
`strength measuring device (Radio Signal Strength Indicator)
`RSSI and an interface RE-I, which are interconnected in the
`radio element RE in the way represented. The field strength
`measuring device RSSI measures the field strength of the
`radio signals selected via the antennas Al, A2 and in the
`transceiver T, R.
`Howthe transceiver T, R is specifically constructed and
`connected to the field strength measuring device RSSI and
`to the interface RE-I is shown and described with reference
`to FIG. 2.
`
`The field strength measuring device RSSI serves in gen-
`eral for testing whether a channelis loaded (cf. DECT Draft
`prETS 300 175-3: 1991, page 164). The specification as to
`how the field strength is to be measured is given in the
`DECTstandard (cf. DECT Draft prETS 300 175-2: 1991,
`page 31, 6.2 and page 38, 8.3). The channelloading is in this
`case established by measuring the field strength (minimum
`field strength) of received radio signals, the measurement
`results RSSI1,
`.
`.
`. subsequently being fed via an analog/
`digital converter A/D to a threshold value generator (Thresh-
`old Value Generator) THVG,integrated in a main processor
`M-CT of the controlling element CE. The threshold value
`generator THVGin this case forms during running operation
`of the base station FT or of the mobile unit PT continually
`updated values, which are incorporated by the main proces-
`sor M-CTin a controlling program CP and serve for driving
`the antennas Al, A2. With the information received from the
`threshold value generator THVG on the channel loading
`(input variable), controlling data CDATAare formed by the
`controlling program CP and are fed via a main processor
`interface M-CTI to a subprocessor (sub-controller) S-CT.
`The subprocessor S-CTis referred to in the base station
`FT as a time switch controller and in the mobile unit PT as
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`a burst modecontroller. Assigned to the subprocessor S-CT
`is,
`inter alia, a multiplex/demultiplex unit MUL/DEM,
`which generates or receives 1.152 Mbit/s data in the DECT
`burst format. In addition, the subprocessor S-CT assumes
`controlling functions for the radio element RE and the
`peripheral elements PE. In the case of the base station FT,
`the multiplex/demultiplex unit MUL/DEM of the subpro-
`cessor S-CT assigns to the data packets received or to be
`sent,
`for example, up to six internal or three external
`telephone connections in the time division multiple access
`TDMA method or in the code division multiple access
`CDMAmethod.In addition, the subprocessor S-CT contains
`a timer/counter TI/CO, which supplies clock pulses to the
`subprocessor S-CT, in particular with respect to the timing
`of bits, time slots and TDMA or CDMAframes.
`FIG. 2 shows the detailed structure of the radio element
`RE with respect to the transceiver T, R. The transceiver T, R
`contains functional blocks which are independent of and
`dependent on the transmission directions, a transmitting
`direction SR and receiving direction ER.
`Belonging to the independent functional blocks are two
`switching elements connected upstream in the stated
`sequence of the antennas Al, A2, a change-over switch
`(Diversity Switch) DS and a selection switch (T/R switch)
`T/R-S, switching back and forth between the transmitting
`direction SR and receiving direction ER.
`The functional blocks of the transceiver T, R which are
`dependent on the respective transmission direction are
`formed,
`in the transmitting direction SR in the stated
`sequence, by two modules connected between the interface
`RE-I of the radio element RE andthe selection switch T/R-
`S, a synthesizer/modulator SY/MO—also referred to in the
`following as transmitter—and a power amplifier PA and, in
`the receiving direction ER, by a receiver REC, connected
`between the field strength measuring device RSSI and the
`selection switch T/R-S.
`
`With the exception of the change-over switch DS, all the
`other modules or functional blocks of the transceiver T, R
`are also contained in the latter even if the radio element RE
`is assigned, for example, only one antenna.
`The modeof operation of the cordless telecommunication
`in a cordless telecommunication system having the base
`station FT and the mobile unit PT according to FIGS. 1 and
`2 is indicated in principle by the. already mentioned printed
`publications (Telcam Report 10, 1987, Issue 2, pages 130 et
`seq. and DECTDraft prETS 175-3: 1991, entire document).
`Thus, in the cordless telecommication system with a bidi-
`rectional (transmitter/receiver or receiver/transmitter) radio
`link between the base station FT and the mobile unit PT,
`voice is on the one hand compressed and transmitted on the
`transmission side and on the other hand is received and
`expanded on the reception side. In order to reduce the
`expenditure of energy required for this in the base station FT
`and the mobile unit PT, in particular whenever the base
`station FT and the mobile unit PT are supplied with energy
`stationarily (for example by a battery or a storage battery),
`the transmitting device RE-T of the base station FT and of
`the mobile unit PT are activated essentially only at trans-
`mission times and the receiving device RE-R of the base
`station FT and of the mobile unit PT is activated essentially
`only at reception times (FIG. 4).
`FIG. 3 shows a DECT-specific TDMA time frame for
`cordless telephone systems in accordance with the DECT
`standard, as is represented in German Utility Models G 92
`14 885 (FIG. 3 therein) and G 92 14 899 (FIG.2 therein).
`For the cordless communication in accordance with the
`
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`5,594,737
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`15
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`6
`5
`of energy consumption) and consequently the effective oper-
`DECTstandard, a dynamic channel selection is carried out
`ating duration of the mobile unit PT up to a battery change
`from about 120 available channels. The 120 channels result
`or charging of the storage battery is reduced.
`from the fact that, in the case of the DECT standard, ten
`frequency bands between 1.8 and 1.9 GHz are used, oper-
`In orderto cater for these two requirements on the mobile
`ating in each frequency band according to the representation
`unit PT, at least partially, the transmitting/receiving device
`in FIG.3 in a time division multiple access (TDMA)with a
`RE/T, RE/R is activated essentially only during the trans-
`time division multiplex frame of 10 ms. In this time division
`mission time SZ of the transmission burst SB. For this
`multiplex frame 24 (from 0 to 23) time channels are defined
`activation, the transmitting/receiving device RE-T, RE-R is
`and, as a result, a frame pattern is prescribed. This frame
`switched on withafirst lead time tv1 with respectto the start
`10
`of transmission UESP. Thisfirst lead time tv] allows for the
`pattern is then used in such’a waythat, for each frequency
`band, for exhale 12 mobile units PT can operate simulta-
`fact
`that
`the transmitting/receiving device RE-T, RE-R
`neously with a base station FT of a DECT communication
`requires a certain running up time in order to be fully
`system in duplex mode (PT-FT and FI-PT or FI-PT and
`functional (running up phase). The first lead time tv1 is in
`PT-FT). In this case, a time slot of respectively 417 ps is
`this case dimensioned such that the running up phase of the
`assigned to the 24 time channels. This time slot indicates the
`transmitting/receiving device RE-T, RE-R is ended at the
`start of transmission UESP.
`time in which the information (data) is transmitted. This
`transmission of information in duplex modeis also referred
`However,for the eventuality that the running up phase of
`to as the ping-pong method, because transmission takes
`the transmitting/receiving device RE-T, RE-Ris not endedat
`place at a certain instant and receiving takes place at another
`the start of transmission UESP (for example on account of
`aging of the electronic components in the mobile unit PT
`instant. In the case of this ping-pong method, in each time
`etc.), it may be expedient to provide a secondleadtime tv2.
`slot a time frame or pulse (burst) of 365 ps, which corre-
`With this second lead time tv2,
`it
`is ensured that
`the
`sponds approximately to a frame length of 420 bits,
`is
`transmitting/receiving device RE-T, RE-R is in any event
`transmitted with a data throughput of 42 kbit/s. Referred to
`ready to operate at the start of transmission UESP (running
`the time division multiplex frame, and bearing in mind that
`up phase in any event ended). The switching-on instant of
`in a guard space GSat both endsofthe time frame there are
`the transmitting/receiving device RE-T, RE-R of the mobile
`in each case 30 bits available for avoiding overlaps caused
`unit PT required for information transmission may conse-
`by adjacent time slots, a total data throughput of 1.152
`quently be determined by the first lead time tv1, the second
`Mbit/s is obtained.
`lead time tv2 or by the total lead time tv1+tv2.
`In the case of the representation in FIG.4, it is assumed
`that the transmitting/receiving device RE-T, RE-R, which
`comprises, as described above, on the one hand the field
`strength measuring device RSSI, the interface RE-I,
`the
`change-over switch DS,the selection switch T/R-S and the
`power amplifier PA—referred to in the following as central
`functional elements of the transmitting/receiving device
`RE-T, RE-R—andalso on the other hand the transmitter
`SY/MOandreceiver REC,is always switched on simulta-
`neously at the possible switching-on instants.
`Alternatively, however,it is also possible that the central
`functional elements of the transmitting/receiving devices
`RE-T, RE-R are switched on at different times than the
`transmitter SY/MOandthe receiver REC.
`In addition, it is also conceivable to expand the transmis-
`sion time-related switching-on of the mobile unit PT to all
`the functional modules of the mobile unit PT which are not
`required for the monitoring of the TDMAframeclock.
`In analogy with the second lead time tv2, it is possible
`furthermore to define a lag time tn2, with which the trans-
`mitting/receiving device RE-T, RE-R is switched off with
`respect to an end of transmission (end of the transmission
`time SZ of the transmission burst SB) UEEP. This achieves
`the effect that the transmitting/receiving device RE-T, RE-R
`is not switched off too early in the possible event of a
`time/frequency drift of the timer/counter TI/CO.
`The descriptions given above with respect to the trans-
`mission burst SB with the transmission time SZ are appli-
`cable in a similar way also to the reception burst EB with the
`reception time EZ, in which the mobile unit PT receives
`information (for example voice messages) from the base
`station FT. In addition, the said descriptions of the trans-
`mitting/receiving mode of the mobile unit PT within a
`TDMAframe(caseI) are applicable in the same wayto the
`transmitting/receiving mode ofthe base station FT within a
`TDMAframe according to FIG. 3 (case I).
`The invention is not limited to the particular details of the
`apparatus depicted and other modifications and applications
`7
`
`Onthe basis of the descriptions given above with respect
`to FIG. 3, in FIG.4 there is represented a TDMAtime frame
`(10 ms) in which a transmission burst SB occurs with a
`transmission time SZ and, 5 mslater, a reception burst EB
`occurs with a reception time EZ (duplex mode). Thus, for
`example, the mobile unit PT can transmit information to the
`base station FT during the transmission time SZ of the
`transmission burst SB and can receive information from the
`base station PT during the reception time EZ ofthe reception
`burst EB (case I).
`it is also possible that the base
`Alternatively to this,
`station FT transmits information to the mobile unit PT
`during the transmission time SZ of the transmission burst SB
`and receives information from the mobile unit PT during the
`reception time EZ of the reception burst EB (case II). Since
`the time sequenceofthe transmission burst SB and reception
`burst EB is unchangeably prescribed in a TDMAframein
`accordance with the DECT standard (5 ms) and this time
`relationship between the transmission burst SB and recep-
`tion burst EB represents the time reference variable for the
`cordless operation of the base station FT and of the mobile
`unit PT, the base station FT and the mobile unit PT are
`correspondingly clock-controlled by the timer/counter
`TCO according to FIG. 1 and consequently set to the
`DECT-specific time frame.
`If the user at the mobile unit PT then wishes, for example,
`to’ transmit information in the TDMA frame (for example
`voice messages)to the base station FT, the mobile unit PT
`must be ready to send at the start of transmission (beginning
`of the transmission burst SB with the transmission time SZ)
`UESP. “Ready to send” in this case means that the radio
`element RE, the controlling element PT and the peripheral
`elements PE of the mobile unit PT according to FIG. 1 are
`switched on. This can be achieved, for example, by the said
`elements being switched on for the entire duration in which
`the mobile unit PT is put into operation by the user. This has
`the consequence, however, that on the other hand the energy
`supply sources of the mobile unit PT (for example battery or
`storage battery) are loaded to a greater extent (in the sense
`
`25
`
`30
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`7
`
`

`

`5,594,737
`
`10
`
`15
`
`8
`7
`2. The arrangement as claimed in claim 1, wherein the
`are contemplated. Certain other changes may be madein the
`above described apparatus without departing from the true
`transmitting/receiving device is switched on withafirst lead
`spirit and scope of the invention herein involved. It is
`time with respect to the transmission/reception time.
`intended,
`therefore, that the subject matter in the above
`3. The arrangement as claimed in claim 1, wherein the
`depiction shall be interpreted as illustrative and not in a
`transmitting/receiving device is switched on with a second
`limiting sense.
`Whatis claimed is:
`lead time with respect to said fixed, predetermined trans-
`1. An arrangementfor controlling a transmitting/receiving
`mission/reception time.
`device of base stations and/or mobile units, in particular of
`4, The arrangement as claimed in claim 1, wherein the
`a cordless telephone system, comprising:
`transmitting/receiving device is switched off with a lag time
`each of the base stations and the mobile units having a
`with respect to the transmission/reception time.
`processor, to which a controlling program is assigned
`5. The arrangement as claimed in claim 1, wherein the
`and voice to be transmitted being compressed on a
`transmitting/receiving device has subdevices and is also
`transmission side, transmitted by a transmitting device
`connected to a transmitter and a receiver.
`of a first transmitting/receiving device within a radio
`link and received by a receiving device of a second
`transmitting/receiving device and expanded;
`the controlling program effecting actuation of the trans-
`mitting deviceofthe first transmitting/receiving device
`substantially only during fixed, predetermined trans-
`mission times within a transmission time frame and
`effecting actuation of the receiving device of the second
`transmitting/receiving device substantially only during
`fixed, predetermined reception times within the trans-
`mission time frame;
`modules for monitoring a frame clock that determines the
`transmission time frame, the modules being excepted
`from the time-related activation.
`
`6. The arrangement as claimed in claim 5, wherein the
`subdevices, the transmitter and the receiver are switched on
`and off simultaneously.
`7. The arrangement as claimed in claim 5, wherein the
`subdevices, the transmitter and the receiver are switched on
`and off at different times.
`
`20
`
`25
`
`8. The arrangement as claimed in claim 1, wherein said
`fixed, predetermined transmission/reception time corre-
`spondsto a time duration of a transmission/reception burst
`in a time frame.
`
`8
`
`