CA2297054A1 - Radio transmission method and telephone system, particularly for dect standard - Google Patents
Radio transmission method and telephone system, particularly for dect standard Download PDFInfo
- Publication number
- CA2297054A1 CA2297054A1 CA002297054A CA2297054A CA2297054A1 CA 2297054 A1 CA2297054 A1 CA 2297054A1 CA 002297054 A CA002297054 A CA 002297054A CA 2297054 A CA2297054 A CA 2297054A CA 2297054 A1 CA2297054 A1 CA 2297054A1
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- CA
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- Prior art keywords
- transmission
- signal
- reception
- channel
- signalling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/725—Cordless telephones
- H04M1/72502—Cordless telephones with one base station connected to a single line
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
- H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2250/00—Details of telephonic subscriber devices
- H04M2250/08—Details of telephonic subscriber devices home cordless telephone systems using the DECT standard
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention relates to a radio transmission method between a transmitter apparatus and a receiver apparatus, wherein said method uses a service channel (area B) for transmitting voice signals and/or data signals as well as a signalling channel (area A) comprising an error correction symbol for transmitting signalling data. When a signalling pause is detected, the transmitter apparatus sends an identification signal for the signalling pauses (P) to the receiver apparatus through the signalling channel. The signals received during the reception of the identification signal for the signalling pauses at the service channel (area B) are not used by the receiver apparatus.
Since the signalling channel includes an error correction, no signal can be reliably transmitted during the signalling pause at the receiver apparatus, thus avoiding the transmission errors that may occur upon transmission in the service channel during the signalling pause or subsequent to the actuation of a mute key.
Since the signalling channel includes an error correction, no signal can be reliably transmitted during the signalling pause at the receiver apparatus, thus avoiding the transmission errors that may occur upon transmission in the service channel during the signalling pause or subsequent to the actuation of a mute key.
Description
FIL~,-I~' IN '~r9r~ ~,~~~~ '~:~~ ' 'T T~~e<3'J~.~,,.~,~z,:
SPECIFLCATION
RADIO TRANSMISSION METHOD AND TELEPHONE SYSTEM, hARTICULARLY FOR DECT STANDARD
The invention is directed to a method and to a telephone system for radio transmission between a transmission device and a reception device and to a reception device, particularly according to the DECT standard.
Digital cordless telephones according to the DECT standard (digital enhanced cordless telephone) are enjoying increasing acceptance. The technical specification is described, for example, in David, Benter ''Digitale l0 Mobilfunksyteme", Stuttgart, 1996, Chapter 8.1. The air interface defined by DECT is based on a combination of FDMA (frequency division multiple access;
and TDMA (time division multiple access). The frequency spectrum from 1880 MHz through 1900 MHz that is available is divided into 10 carriers each having 1728-kHz channel spacing. Each carrier, as shown in the attached Fig. 1, is divided into rE~pectively 24 time slots that form a frame having an overall le;~qth of 10 ms. The first twelve channels are reserved for the downstream connection from the mobile part to the fixed station and the following twelve time slots are reserved for the upstream connections between fixed station and mobile part. A
duplex connection is formed by a pair of time slots, for example time slot 11 and 2 0 time slot 23. The upstream and downstream connections are then separated from one another by a duplex spacing of respectively 5 ms.
Proceeding from the publicaticm, Components 31 (1993), No. 6, pages 215 through 218, S. Althammer, D. Bruckmanr,, "Hochoptimierte IC's fur DECT-Schnurlostelefone", Figure 2 shows the basic circuit structure of the base station 2 5 BS and of the mobile part MT of a cordless telephone system. The base station BS and the mobile part MT accordingly comprise a radio part FKT with an antenna ANT allocated for sending and receiving radio signals, a signal processing means SVE and a central controller ZST that are connected to one another in the illustrated way. It is essentially the known devices such as 3 o transmitter SE, receiver EM and synthesizer SYN that are DEC-29-99 16:41 312 816 0898CA 02297054 2000-O1-14 P.02 R-321 Job-116 _. .DEL 29 'H9 04:47PM HILL...SIMPSON P.2 contained in the radio part' FKT. Among other things, a coderldecoder means CODEC is contained in the signal processing means SVE. The central controller ZST comprises a microprocessor NP both for the base station BS as well as for the mobile part and having a program module PGM
s constructed according to the ,OSIIISO layer mode! [sae "1":
Unterrichtsbl~Itter - Deutsche Telekom, Vol. 48, 211995, pages 102 through 111; (2): ETSI
Publication ETS 300175-1....9, October 1992], a signal control part SST and a digital signal p,~ocessor DSP that are connected to one another in the illustrated way. Of the layers defined in the layer model, only the first four layers directly essential for the base station BS in the mobile part MT are shown. The signal control part SST is configured in the base station BS as time bwitch controller TSC and is configured as burst mode controller BMC
in the mobile part MT. The critical difference between the two signal control parts TSC, BMC is comprised therein that the base station-specific signal control part TSC assumes additional switching functions compared to the mobile part-specific signal control part BMC.
The basic function of~the above-recited circuit units is described, for example, in the publication, Components 31 (1993), No. 6, pages 215 through 218.
z o When it is taken into consideration that, as mentioned, t~n carrier frequencies are available, then the overall capacity amounts to a total of 120 duplex channels. A DECT cordless system then automatically selects the channel having the respectively best connection quality.
The lower part of Figure 1 schematically shows the composition of an 2 s individual time slot having a total duration of 416.6 frs, corresponding to 480 bits. First, a protective band comprising 60 bits is provided in order to enable a reliable separation between neighboring time slots. Of th~ remaining 4a0 bits, 32 bits devolve onto the synchronization {S-field) end four bits devolve onto the parity check (X-field). 64 bits devolve onto a signaling channel (A-3 o field) of which 16 bits in turn are an error code, for example cyclic redundancy check (CRC). The remaining 48 bits are available fnr signaling, for example information for 'the connection setup, exchange of identifiers, handover to a further network cell. The signaling rate of a duplex channel thus amounts to 64 bits/10 ms = 6.4 kilobits. The data transmitted in the signaling channel are protected against transmission errors by the error correction bits. The 320 bits of the payload channel (B-field), by contrast, s are not specifically protected against transmission errors. The transmission rate in a payload channel amounts tc 32 kilobits.
DE-195 15 546 A1 discloses a method and an arrangement for wireless transmission of voice signals and of data signals via the same radio channel between a transmission means and a reception means. In to the transmission means, data signals together with at least one control signal for identification of the pauses in speech are transmitted to the reception means via the same radio channel as voice signals, the data signals being separated from the control signal in said reception means and being output during the pauses in speaking. In this way, data signals 15 can also be sent on the same radio channel and receive thereon when pauses in speech occur and voice signals are not being sent. This leads to a better usage of the wireless radio transmission path with respect to the information transmission in both transmission directions. For preventing the occurrence of noise signals or unwanted noises in the 2 o transmission of the pauses in speaking, a noise signal that is generated in the reception means and is therefore free of transmission errors is supplied to the earphone amplifier in the reception means during the pauses in speaking. The signals received in the payload channel are thus not further-processed in the reception means.
25 DE-42 36 088 A1 discloses a method for reducing disturbing influences of poor voice transmission quality in a telephone connection with a cordless telephone device, whereby the A-field of a DECT burst is responsible for connection-accompanying information, and whereby given telephone connections between a base station part and a mobile part of 3 o the cordless telephone device according to the DECT standard, clicking and noise sounds occurring during the ADPCM transmission of voice due to bit errors are prevented by a muting circuit (muting of the voice signal) undertaken in the respective part of the cordless telephone set.
When signal pauses occur given a DE(~T cordless telephone mobile part, for example due to a pause in speaking of the cordless s telephone user, then the ambient noises can be transmitted to the fixed station and then to the telephone partner in the B-channel or, given detection of a signal pause, the tArminal equipment transmits a mute signal (composed only of ones) to the call partner. In the former instance, the ambient noises can be felt to be rather disturbing, particularly when 1 o the sensitivity of the microphone adapts to the acquired signal level.
When, in the second case, the mute signals are transmitted in the payload channel (B-field), these are decoded at the reception side like normal audio data and produce "silence" at the reception loudspeaker given error-free reception. When, however, transmission errors occur given this 15 mute signal, !oud unwanted noises can occur instead.
The present invention is therefore based on the object of developing a method for radio transmission between a transmission means and a reception means as well as a telephone system for radio transmission between a transmission device and a reception device such 2 o that the occurrence of noise signals or unwanted noises in the transmission of signal pauses is significantly reduced.
Proceeding from the method defined in the preamble of patent claim 1, this object is achieved by the features recited in the characterizing pat of patent claim 1.
2 s Over and above this and proceeding from the telephone system defined in the preamble of patent claim 4, the object is achieved by the features recited in the characterizing part of patent claim 4.
The invention proposes a method as well as a telephone system for radio transmission between a transmission device and a reception 3 o device, whereby, given acquisition of a signal pause by the transmission device, a signal pause identification signal is transmitted to the reception means via the signaling channel (A-field), whereupon the signals received 4a in the payload channel during the reception of the transmission pause identification signal are not employed, are preferably not even decoded and/or amplified. Since the signal pause identification signal is s transmitted in the signaling channel (A-field) protected against transmission errors, the occurrence of transmission errors in signal pauses can be significantly diminished.
Advantageous developments of the invention are recited in the su bclaims.
1o The functioning principle of the inventive method or, respectively, of the inventive telephone system is explained by way of example below with reference to the Figures, wherein Figure 1 schematically shows an example of a time frame structure emplo;~ed in the inventive method;
Figure 2 is a block circuit diagram of a known cordless telephone system according to the DECT standard.
Cordless telephones are usually employed in a combination of base station and one or more mobile stations. The signals are communicated 5 from the mobile station to the base station by radio, said base station being in turn connected to the fixed telephone network and communicating the signals to the call partner, who can employ a fixed network telephone, a cordless telephone or a mobile telephone or the like. The time slots 0 through 11 are reserved for the transmission of signals from the base station to to the mobile part; the time slots 12 through 23 are reserved for the signal communication from the mobile device to the base station (upstream connection). Base station and mobile part can be fashioned as shown in Figure 2. The central control unit ZST of the mobile part MT, however, additional comprises a means that recognizes a signal pause, i.e. a pause in speaking of the subscriber at the mobile part or the like, with reference to an input level lying below a predetermined value. When a signal pause or a signal interruption is recognized, a signal pause identification signal P is transmitted in the A-field, i.e. the signaling channel of the time slot. The fixed station recognizes the signal pause identification signal P in the A-field and 2 o interrupts the decoding, amplification and/or forwarding of the signals received in the B-field. Since the signaling data in the A-field are protected against transmission errors by an error correction coding (CRC), the signal pause identification signal can be reliably transmitted. Transmission disturbances potentially contained in the B-field reception data, which are not 2 s error correction coded, are thus not forwarded by the fixed station and are therefore not audible at the reception means. The transmission quality of the inventive DECT cordless telephone system is therefore improved.
SPECIFLCATION
RADIO TRANSMISSION METHOD AND TELEPHONE SYSTEM, hARTICULARLY FOR DECT STANDARD
The invention is directed to a method and to a telephone system for radio transmission between a transmission device and a reception device and to a reception device, particularly according to the DECT standard.
Digital cordless telephones according to the DECT standard (digital enhanced cordless telephone) are enjoying increasing acceptance. The technical specification is described, for example, in David, Benter ''Digitale l0 Mobilfunksyteme", Stuttgart, 1996, Chapter 8.1. The air interface defined by DECT is based on a combination of FDMA (frequency division multiple access;
and TDMA (time division multiple access). The frequency spectrum from 1880 MHz through 1900 MHz that is available is divided into 10 carriers each having 1728-kHz channel spacing. Each carrier, as shown in the attached Fig. 1, is divided into rE~pectively 24 time slots that form a frame having an overall le;~qth of 10 ms. The first twelve channels are reserved for the downstream connection from the mobile part to the fixed station and the following twelve time slots are reserved for the upstream connections between fixed station and mobile part. A
duplex connection is formed by a pair of time slots, for example time slot 11 and 2 0 time slot 23. The upstream and downstream connections are then separated from one another by a duplex spacing of respectively 5 ms.
Proceeding from the publicaticm, Components 31 (1993), No. 6, pages 215 through 218, S. Althammer, D. Bruckmanr,, "Hochoptimierte IC's fur DECT-Schnurlostelefone", Figure 2 shows the basic circuit structure of the base station 2 5 BS and of the mobile part MT of a cordless telephone system. The base station BS and the mobile part MT accordingly comprise a radio part FKT with an antenna ANT allocated for sending and receiving radio signals, a signal processing means SVE and a central controller ZST that are connected to one another in the illustrated way. It is essentially the known devices such as 3 o transmitter SE, receiver EM and synthesizer SYN that are DEC-29-99 16:41 312 816 0898CA 02297054 2000-O1-14 P.02 R-321 Job-116 _. .DEL 29 'H9 04:47PM HILL...SIMPSON P.2 contained in the radio part' FKT. Among other things, a coderldecoder means CODEC is contained in the signal processing means SVE. The central controller ZST comprises a microprocessor NP both for the base station BS as well as for the mobile part and having a program module PGM
s constructed according to the ,OSIIISO layer mode! [sae "1":
Unterrichtsbl~Itter - Deutsche Telekom, Vol. 48, 211995, pages 102 through 111; (2): ETSI
Publication ETS 300175-1....9, October 1992], a signal control part SST and a digital signal p,~ocessor DSP that are connected to one another in the illustrated way. Of the layers defined in the layer model, only the first four layers directly essential for the base station BS in the mobile part MT are shown. The signal control part SST is configured in the base station BS as time bwitch controller TSC and is configured as burst mode controller BMC
in the mobile part MT. The critical difference between the two signal control parts TSC, BMC is comprised therein that the base station-specific signal control part TSC assumes additional switching functions compared to the mobile part-specific signal control part BMC.
The basic function of~the above-recited circuit units is described, for example, in the publication, Components 31 (1993), No. 6, pages 215 through 218.
z o When it is taken into consideration that, as mentioned, t~n carrier frequencies are available, then the overall capacity amounts to a total of 120 duplex channels. A DECT cordless system then automatically selects the channel having the respectively best connection quality.
The lower part of Figure 1 schematically shows the composition of an 2 s individual time slot having a total duration of 416.6 frs, corresponding to 480 bits. First, a protective band comprising 60 bits is provided in order to enable a reliable separation between neighboring time slots. Of th~ remaining 4a0 bits, 32 bits devolve onto the synchronization {S-field) end four bits devolve onto the parity check (X-field). 64 bits devolve onto a signaling channel (A-3 o field) of which 16 bits in turn are an error code, for example cyclic redundancy check (CRC). The remaining 48 bits are available fnr signaling, for example information for 'the connection setup, exchange of identifiers, handover to a further network cell. The signaling rate of a duplex channel thus amounts to 64 bits/10 ms = 6.4 kilobits. The data transmitted in the signaling channel are protected against transmission errors by the error correction bits. The 320 bits of the payload channel (B-field), by contrast, s are not specifically protected against transmission errors. The transmission rate in a payload channel amounts tc 32 kilobits.
DE-195 15 546 A1 discloses a method and an arrangement for wireless transmission of voice signals and of data signals via the same radio channel between a transmission means and a reception means. In to the transmission means, data signals together with at least one control signal for identification of the pauses in speech are transmitted to the reception means via the same radio channel as voice signals, the data signals being separated from the control signal in said reception means and being output during the pauses in speaking. In this way, data signals 15 can also be sent on the same radio channel and receive thereon when pauses in speech occur and voice signals are not being sent. This leads to a better usage of the wireless radio transmission path with respect to the information transmission in both transmission directions. For preventing the occurrence of noise signals or unwanted noises in the 2 o transmission of the pauses in speaking, a noise signal that is generated in the reception means and is therefore free of transmission errors is supplied to the earphone amplifier in the reception means during the pauses in speaking. The signals received in the payload channel are thus not further-processed in the reception means.
25 DE-42 36 088 A1 discloses a method for reducing disturbing influences of poor voice transmission quality in a telephone connection with a cordless telephone device, whereby the A-field of a DECT burst is responsible for connection-accompanying information, and whereby given telephone connections between a base station part and a mobile part of 3 o the cordless telephone device according to the DECT standard, clicking and noise sounds occurring during the ADPCM transmission of voice due to bit errors are prevented by a muting circuit (muting of the voice signal) undertaken in the respective part of the cordless telephone set.
When signal pauses occur given a DE(~T cordless telephone mobile part, for example due to a pause in speaking of the cordless s telephone user, then the ambient noises can be transmitted to the fixed station and then to the telephone partner in the B-channel or, given detection of a signal pause, the tArminal equipment transmits a mute signal (composed only of ones) to the call partner. In the former instance, the ambient noises can be felt to be rather disturbing, particularly when 1 o the sensitivity of the microphone adapts to the acquired signal level.
When, in the second case, the mute signals are transmitted in the payload channel (B-field), these are decoded at the reception side like normal audio data and produce "silence" at the reception loudspeaker given error-free reception. When, however, transmission errors occur given this 15 mute signal, !oud unwanted noises can occur instead.
The present invention is therefore based on the object of developing a method for radio transmission between a transmission means and a reception means as well as a telephone system for radio transmission between a transmission device and a reception device such 2 o that the occurrence of noise signals or unwanted noises in the transmission of signal pauses is significantly reduced.
Proceeding from the method defined in the preamble of patent claim 1, this object is achieved by the features recited in the characterizing pat of patent claim 1.
2 s Over and above this and proceeding from the telephone system defined in the preamble of patent claim 4, the object is achieved by the features recited in the characterizing part of patent claim 4.
The invention proposes a method as well as a telephone system for radio transmission between a transmission device and a reception 3 o device, whereby, given acquisition of a signal pause by the transmission device, a signal pause identification signal is transmitted to the reception means via the signaling channel (A-field), whereupon the signals received 4a in the payload channel during the reception of the transmission pause identification signal are not employed, are preferably not even decoded and/or amplified. Since the signal pause identification signal is s transmitted in the signaling channel (A-field) protected against transmission errors, the occurrence of transmission errors in signal pauses can be significantly diminished.
Advantageous developments of the invention are recited in the su bclaims.
1o The functioning principle of the inventive method or, respectively, of the inventive telephone system is explained by way of example below with reference to the Figures, wherein Figure 1 schematically shows an example of a time frame structure emplo;~ed in the inventive method;
Figure 2 is a block circuit diagram of a known cordless telephone system according to the DECT standard.
Cordless telephones are usually employed in a combination of base station and one or more mobile stations. The signals are communicated 5 from the mobile station to the base station by radio, said base station being in turn connected to the fixed telephone network and communicating the signals to the call partner, who can employ a fixed network telephone, a cordless telephone or a mobile telephone or the like. The time slots 0 through 11 are reserved for the transmission of signals from the base station to to the mobile part; the time slots 12 through 23 are reserved for the signal communication from the mobile device to the base station (upstream connection). Base station and mobile part can be fashioned as shown in Figure 2. The central control unit ZST of the mobile part MT, however, additional comprises a means that recognizes a signal pause, i.e. a pause in speaking of the subscriber at the mobile part or the like, with reference to an input level lying below a predetermined value. When a signal pause or a signal interruption is recognized, a signal pause identification signal P is transmitted in the A-field, i.e. the signaling channel of the time slot. The fixed station recognizes the signal pause identification signal P in the A-field and 2 o interrupts the decoding, amplification and/or forwarding of the signals received in the B-field. Since the signaling data in the A-field are protected against transmission errors by an error correction coding (CRC), the signal pause identification signal can be reliably transmitted. Transmission disturbances potentially contained in the B-field reception data, which are not 2 s error correction coded, are thus not forwarded by the fixed station and are therefore not audible at the reception means. The transmission quality of the inventive DECT cordless telephone system is therefore improved.
Claims (5)
1. Method for radio transmission between a transmission means (BS, MT) and a reception means (MT, BS) whereby, (a) a payload channel is provided for transmission of voice and/or data signals and a signaling channel provided with error correction characters is provided for transmission of signaling data, (b) a signal pause identification signal (P) is transmitted to the reception means (MT, BS) by the transmission means (BS, MT) for acquisition of a signal pause, characterized in that the signal pause identification signal (P) is sent to the reception device (MT, BS) via the signaling channel, whereupon the signals received in the payload channel at the reception means (MT, BS) during the reception of the signal pause identification signal (P) are not further-processed.
2. Method according to claim 1, characterized in that the signals received in the payload channel at the reception means (MT, BS) during the reception of the signal pause identification signal are not decoded and/or amplified.
3. Method according to claim 1 or 2, characterized in that a base station (BS) functioning according to the DECT standard or, respectively, a mobile part (MT) functioning according to the DECT
standard are employed as the transmission device (BS, MT) and a mobile part (MT) functioning according to the DECT standard or, respectively, a base station (BS) functioning according to the DECT standard are employed as the reception device (MT, BS).
standard are employed as the transmission device (BS, MT) and a mobile part (MT) functioning according to the DECT standard or, respectively, a base station (BS) functioning according to the DECT standard are employed as the reception device (MT, BS).
4. Telephone system for radio transmission between a transmission device (BS, MT) and a reception device (MT, BS), whereby (a) a payload channel is provided for the transmission of voice and/or data signals and a signaling channel provided with error correction characters is provided for the transmission of signaling data, (b) the transmission device (BS, MT) comprises a means (µP) for acquiring a signal pause and a means (ZST, SVE, FKT, ANT) for the transmission of a signal pause identification signal (P) given acquisition of a signal pause, characterized in that the means (ZST, SVE, FKT, ANT) for the transmission of the signal pause identification signal (P) is fashioned such that the signal pause identification signal (P) is transmitted to the reception device (MT, BS) via the signalling channel; and in that the signals received in the payload channel are not further-processed during the reception of the signal pause identification signal (P).
5. Telephone system according to claim 4, characterized in that the transmission device (BS, MT) is base station (BS) or, respectively, a mobile part (MT) and the reception device (MT, BS) is a mobile part (MT) or, respectively, a base station according to the DECT
standard.
standard.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19730984.4 | 1997-07-18 | ||
| DE19730984A DE19730984A1 (en) | 1997-07-18 | 1997-07-18 | Radio transmission method and cordless telephone, especially for the DECT standard |
| PCT/DE1998/001413 WO1999004586A1 (en) | 1997-07-18 | 1998-05-25 | Radio transmission method and cordless phone mainly intended for dect standards |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2297054A1 true CA2297054A1 (en) | 1999-01-28 |
Family
ID=7836206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002297054A Abandoned CA2297054A1 (en) | 1997-07-18 | 1998-05-25 | Radio transmission method and telephone system, particularly for dect standard |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP1016294A1 (en) |
| JP (1) | JP2001510972A (en) |
| CN (1) | CN1264523A (en) |
| AR (1) | AR009886A1 (en) |
| AU (1) | AU8430598A (en) |
| CA (1) | CA2297054A1 (en) |
| DE (1) | DE19730984A1 (en) |
| WO (1) | WO1999004586A1 (en) |
| ZA (1) | ZA986317B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI105635B (en) * | 1998-09-01 | 2000-09-15 | Nokia Mobile Phones Ltd | Method of transmitting background noise information during data transfer in data frames |
| MX2012012567A (en) | 2010-04-28 | 2012-11-21 | Kimberly Clark Co | Method for increasing permeability of an epithelial barrier. |
| JP6055431B2 (en) * | 2014-03-13 | 2016-12-27 | サクサ株式会社 | Cordless telephone device and wireless communication method |
| JP7042463B2 (en) * | 2018-06-13 | 2022-03-28 | パナソニックＩｐマネジメント株式会社 | Cordless phone and base unit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5537509A (en) * | 1990-12-06 | 1996-07-16 | Hughes Electronics | Comfort noise generation for digital communication systems |
| DE4236088A1 (en) * | 1992-10-26 | 1994-04-28 | Siemens Ag | Method for reducing the adverse effects of poor voice transmission quality when connected to a cordless telephone |
| JP3090842B2 (en) * | 1994-04-28 | 2000-09-25 | 沖電気工業株式会社 | Transmitter adapted to Viterbi decoding method |
| FI99066C (en) * | 1995-01-31 | 1997-09-25 | Nokia Mobile Phones Ltd | data Transfer method |
| FI100932B (en) * | 1995-04-12 | 1998-03-13 | Nokia Telecommunications Oy | Transmission of audio frequency signals in a radiotelephone system |
| DE19515546C2 (en) * | 1995-04-27 | 1999-01-07 | Siemens Ag | Method and arrangement for wireless transmission of voice signals and data signals over the same radio channel between a transmitting device and a receiving device |
-
1997
- 1997-07-18 DE DE19730984A patent/DE19730984A1/en not_active Ceased
-
1998
- 1998-05-25 EP EP98934778A patent/EP1016294A1/en not_active Withdrawn
- 1998-05-25 WO PCT/DE1998/001413 patent/WO1999004586A1/en not_active Application Discontinuation
- 1998-05-25 JP JP2000503674A patent/JP2001510972A/en active Pending
- 1998-05-25 AU AU84305/98A patent/AU8430598A/en not_active Abandoned
- 1998-05-25 CN CN98807372A patent/CN1264523A/en active Pending
- 1998-05-25 CA CA002297054A patent/CA2297054A1/en not_active Abandoned
- 1998-07-14 AR ARP980103418A patent/AR009886A1/en active IP Right Grant
- 1998-07-16 ZA ZA986317A patent/ZA986317B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ZA986317B (en) | 1999-01-22 |
| CN1264523A (en) | 2000-08-23 |
| AR009886A1 (en) | 2000-05-03 |
| AU8430598A (en) | 1999-02-10 |
| EP1016294A1 (en) | 2000-07-05 |
| DE19730984A1 (en) | 1999-02-11 |
| WO1999004586A1 (en) | 1999-01-28 |
| JP2001510972A (en) | 2001-08-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20030526 |