EP1016294A1 - Radio transmission method and cordless phone mainly intended for dect standards - Google Patents

Radio transmission method and cordless phone mainly intended for dect standards

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Publication number
EP1016294A1
EP1016294A1 EP98934778A EP98934778A EP1016294A1 EP 1016294 A1 EP1016294 A1 EP 1016294A1 EP 98934778 A EP98934778 A EP 98934778A EP 98934778 A EP98934778 A EP 98934778A EP 1016294 A1 EP1016294 A1 EP 1016294A1
Authority
EP
European Patent Office
Prior art keywords
signal
channel
signalling
pause
transmission
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.)
Withdrawn
Application number
EP98934778A
Other languages
German (de)
French (fr)
Inventor
Rolf Biedermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1016294A1 publication Critical patent/EP1016294A1/en
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to a method for radio transmission between a transmitting device and a receiving device and a cordless telephone, in particular according to the DECT standard.
  • Digital cordless phones based on the DECT (Digital Enhanced Cordless Telephone) standard are becoming increasingly popular.
  • the technical specification is described, for example, in David, Benter “Digitale Mobilfunkksyteme", Stuttgart, 1996, chapter 8.1.
  • the air interface defined by DECT is based on a combination of FDMA (Freguency Division Multiple Access) and TDMA (Time Division Multiple Access).
  • FDMA Freguency Division Multiple Access
  • TDMA Time Division Multiple Access
  • the available frequency spectrum from 1880 MHz to 1900 MHz is divided into ten carriers, each with a channel spacing of 1728 kHz. As shown in the attached FIG. 1, each carrier is divided into 24 time slots, which form a frame with a total length of 10 ms.
  • the first twelve channels are reserved for the downlink from the handset to the base station and the following twelve time slots for the uplinks between base station and handset.
  • a duplex connection is formed by a pair of time slots, for example time slot 11 and time slot 23.
  • the uplink and downlink are then separated from each other by a duplex spacing of 5 ms.
  • FIG. 2 shows, starting from the publication Components 31 (1993), Issue 6, pages 215 to 218; S. Althammer, D. Bruckmann: "Highly optimized ICs for DECT cordless phones" the basic circuit structure of the base station BS and the mobile part MT of a cordless phone system.
  • the base station BS and the mobile part MT then have a radio part FKT with one for transmitting and receiving radio signals associated antenna ANT, a signal processing device SVE and a central controller ZST, which are connected to each other in the manner shown.
  • the radio part FKT essentially contains the known devices such as transmitter SE, receiver EM and synthesizer SYN. Among other things, a coding
  • Layer model [cf. (1): settlesnch - Irish institutions, Jg. 48, 2/1995, pages 102 to 111; (2): ETSI publication ETS 300175-1 ... 9, October 1992] built PGM program module, a signal control part SST and a digital signal processor DSP, which are interconnected in the manner shown. Of the layers defined in the layer model, only the first four layers that are essential for the base station BS and the mobile part MT are shown.
  • the signal control part SST is designed in the base station BS as a time switch controller TSC and in the mobile part MT as a burst mode controller BMC.
  • the essential difference between the two signal control parts TSC, BMC is that the base station-specific signal control part TSC takes on additional switching functions (switch functions) compared to the object part-specific signal control part BMC.
  • FIG. 1 shows schematically the composition of a single time slot with a total of 416.6 ⁇ s duration, corresponding to 480 bits.
  • a 60-bit protective band is present in order to enable the safe separation of adjacent time slots.
  • S field 32 bits are used for synchronization
  • X field 4 bits for parity control
  • a signaling channel (A field) accounts for 64 bits, of which 16 bits are an error code, for example Cyclic Redundancy Check (CRC).
  • CRC Cyclic Redundancy Check
  • the remaining 48 bits are available for signaling, for example information for establishing a connection, exchange of identifiers, forwarding to another network cell (handover).
  • the data transmitted in the signaling channel are protected from transmission errors by the error correction bits.
  • the 320 bits of the user channel (B field), however, are not specially protected against transmission errors.
  • the transmission rate in a user channel is 32 kilobit / s.
  • DE-195 15 546 AI discloses a method and an arrangement for the wireless transmission of voice signals and of data signals over the same radio channel between a transmitting device and a receiving device.
  • data signals are transmitted together with at least one control signal for identifying the pauses in speech via the same radio channel as the speech signals to the receiving device, in which the data signals are separated from the control signal and are output during the pauses in speech.
  • the data signals are separated from the control signal and are output during the pauses in speech.
  • the ambient noise can be transmitted to the base station and then to the telephone partner in the B channel, or the terminal device transmits a silent signal when a signal pause is detected (courage signal, consisting of all ones) to the conversation partner.
  • the ambient noise can be perceived as being quite annoying, especially if the sensitivity of the microphone adapts to the detected signal level.
  • the mute signals are transmitted in the useful channel (B field), they are decoded on the receiving side like normal audio data and produce "silence" on the receiving loudspeaker when reception is error-free. However, if transmission errors occur with this mute signal, violent noise can occur instead.
  • the present invention is therefore based on the object of further developing a method for radio transmission between a transmitting device and a receiving device and a cordless telephone in such a way that the transmission quality is improved.
  • the occurrence of interference signals or noise during a signal pause should be prevented.
  • the invention proposes a method for radio transmission between a transmitter and a receiver, in which a signal pause identification signal is transmitted to the receiver when a signal pause is detected by the transmitter via the signaling channel (A field), whereupon the receiver during the reception of the Transmission pause identification signal, the signals received in the useful channel are not used, preferably not decoded and / or amplified. Since the signal pause identification signal is transmitted in the signaling channel (A field) protected against transmission errors, the occurrence of transmission errors during signal pauses can be significantly reduced.
  • the method according to the invention is particularly applicable to digital cordless telephones according to the DECT standard.
  • the invention also proposes a cordless telephone which has a device for detecting a signal pause and a device for transmitting a signal pause identification signal when a signal pause is detected.
  • FIG. 1 schematically shows an example of a time frame structure used in the method according to the invention
  • Figure 2 is a block diagram of a known cordless telephone system according to the DECT standard.
  • Cordless phones are usually used in a combination of a base station and one or more mobile stations.
  • the signals are forwarded by radio from the mobile station to the base station, which in turn is Fixed network is connected and transmits the signals to the interlocutor, who can use a landline phone, a cordless phone or a cell phone or the like.
  • Time slots 0 to 11 are reserved for the transmission of signals from the base station to the handset
  • time slots 12 to 23 are reserved for the transmission of signals from the mobile device to the base station (uplink).
  • Be formed as shown base station and handset can, as i "FIG.
  • the central control unit ZST of Mo bilteils MT but additionally includes means that a signal pause, ie, a speech pause of the subscriber on the handset or the like to a level lower than a predetermined value If a signal pause or signal interruption is detected, a signal pause identification signal P is transmitted in the A field, ie the signaling channel of the time slot.
  • the base station recognizes the signal pause identification signal P in the A field and interrupts 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 transmitted reliably not forwarded by the base station and are therefore not audible on the receiving device.
  • the transmission quality of the DECT cordless telephone system according to the invention is therefore improved.

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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.

Description

Beschreibungdescription
Funk-Übertragungsverfahren und Schnurlostelefon, insbesondere für DECT-StandardRadio transmission method and cordless telephone, especially for the DECT standard
Die Erfindung betrifft ein Verfahren zur Funk-Übertragung zwischen einem Sendegerät und einem Empfangsgerät und ein Schnurlostelefon, insbesondere nach dem DECT-Standard.The invention relates to a method for radio transmission between a transmitting device and a receiving device and a cordless telephone, in particular according to the DECT standard.
Digitale Schnurlostelefone nach dem DECT (Digital Enhanced Cordless Telephone) -Standard erfreuen sich zunehmender Beliebtheit. Die technische Spezifikation ist beispielsweise in David, Benter "Digitale Mobilfunksyteme", Stuttgart, 1996, Kapitel 8.1 beschrieben. Die durch DECT definierte Luftschnitt- stelle basiert auf einer Kombination aus FDMA (Freguency Division Multiple Access) und TDMA (Time Division Multiple Access) . Das zur Verfügung stehende Frequenzspektrum von 1880 MHz bis 1900 MHz wird in zehn Träger mit je 1728 kHz Kanalabstand aufgeteilt. Jeder Träger ist, wie in der anliegenden Fi- gur 1 dargestellt ist, in jeweils 24 Zeitschlitze unterteilt, die einen Rahmen mit einer Gesamtlänge von 10 ms bilden. Die ersten zwölf Kanäle sind für die Abwärtsverbindung von dem Mobilteil zur Feststation und die folgenden zwölf Zeitschlitze für die Aufwärtsverbindungen zwischen Feststation und Mobil- teil reserviert. Eine Duplexverbindung wird durch ein Paar von Zeitschlitzen, beispielsweise Zeitschlitz 11 und Zeitschlitz 23 gebildet. Die Aufwärts- und Abwärtsverbindungen sind dann durch einen Duplexabstand von jeweils 5 ms voneinander getrennt.Digital cordless phones based on the DECT (Digital Enhanced Cordless Telephone) standard are becoming increasingly popular. The technical specification is described, for example, in David, Benter "Digitale Mobilfunkksyteme", Stuttgart, 1996, chapter 8.1. The air interface defined by DECT is based on a combination of FDMA (Freguency Division Multiple Access) and TDMA (Time Division Multiple Access). The available frequency spectrum from 1880 MHz to 1900 MHz is divided into ten carriers, each with a channel spacing of 1728 kHz. As shown in the attached FIG. 1, each carrier is divided into 24 time slots, which form a frame with a total length of 10 ms. The first twelve channels are reserved for the downlink from the handset to the base station and the following twelve time slots for the uplinks between base station and handset. A duplex connection is formed by a pair of time slots, for example time slot 11 and time slot 23. The uplink and downlink are then separated from each other by a duplex spacing of 5 ms.
Figur 2 zeigt ausgehend von der Druckschrift Components 31 (1993), Heft 6, Seiten 215 bis 218; S. Althammer, D. Bruck- mann: "Hochoptimierte IC 's für DECT-Schnurlostelefone" den prinzipiellen Schaltungsaufbau der Basisstation BS und des Mo- bilteils MT einer Schnurlostelefonanlage. Die Basisstation BS und das Mobilteil MT weisen danach ein Funkteil FKT mit einer zum Senden und Empfangen von Funksignalen zugeordneten Antenne ANT, eine Signalverarbeitungseinrichtung SVE und eine zentrale Steuerung ZST auf, die in der dargestellten Weise miteinander verbunden sind. In dem Funkteil FKT sind im we- sentlichen die bekannten Einrichtungen wie Sender SE, Empfänger EM und Synthesizer SYN enthalten. In der Signalverarbeitungseinrichtung SVE ist u. a. eine Kodier-Figure 2 shows, starting from the publication Components 31 (1993), Issue 6, pages 215 to 218; S. Althammer, D. Bruckmann: "Highly optimized ICs for DECT cordless phones" the basic circuit structure of the base station BS and the mobile part MT of a cordless phone system. The base station BS and the mobile part MT then have a radio part FKT with one for transmitting and receiving radio signals associated antenna ANT, a signal processing device SVE and a central controller ZST, which are connected to each other in the manner shown. The radio part FKT essentially contains the known devices such as transmitter SE, receiver EM and synthesizer SYN. Among other things, a coding
/Dekodiereinrichtung CODEC enthalten. Die zentrale Steuerung ZST weist sowohl für die Basisstation BS als für das Mobilteil MT einen Mikroprozessor μP mit einem nach dem OSI/ISO-/ CODEC decoder included. The central control ZST has a microprocessor μP for the base station BS as well as for the mobile part MT with an OSI / ISO
Schichtenmodell [vgl. (1): Unterrichtsblätter - Deutsche Telekom, Jg. 48, 2/1995, Seiten 102 bis 111; (2) : ETSI-Publikation ETS 300175-1...9, Oktober 1992] aufgebauten Prograπimmodul PGM, einen Signalsteuerungsteil SST und einen digitalen Signalpro- zessor DSP auf, die in der dargestellten Weise miteinander verbunden sind. Von den im Schichtenmodell definierten Schichten sind nur die unmittelbar für die Basisstation BS und das Mobilteil MT wesentlichen ersten vier Schichten dargestellt. Das Signalsteuerungsteil SST ist in der Basisstation BS als Time Switch Controller TSC und in dem Mobilteil MT als Burst Mode Controller BMC ausgebildet. Der wesentliche Unterschied zwischen den beiden Signalsteuerungsteilen TSC, BMC besteht darin, daß der basisstationsspezifische Signalsteuerungsteil TSC gegenüber dem obilteilspezifischen Signalsteuerungsteil BMC zusätzlich Vermittlungsfunktionen (Switch-Funktionen) übernimmt.Layer model [cf. (1): Unterrichtsblätter - Deutsche Telekom, Jg. 48, 2/1995, pages 102 to 111; (2): ETSI publication ETS 300175-1 ... 9, October 1992] built PGM program module, a signal control part SST and a digital signal processor DSP, which are interconnected in the manner shown. Of the layers defined in the layer model, only the first four layers that are essential for the base station BS and the mobile part MT are shown. The signal control part SST is designed in the base station BS as a time switch controller TSC and in the mobile part MT as a burst mode controller BMC. The essential difference between the two signal control parts TSC, BMC is that the base station-specific signal control part TSC takes on additional switching functions (switch functions) compared to the object part-specific signal control part BMC.
Die prinzipielle Funktionsweise der vorstehend aufgeführten Schaltungseinheiten ist beispielsweise in der Druckschrift Components 31 (1993), Heft 6, Seiten 215 bis 218 beschrieben.The principle of operation of the circuit units listed above is described, for example, in the publication Components 31 (1993), No. 6, pages 215 to 218.
Berücksichtigt man, daß, wie erwähnt, zehn Trägerfrequenzen zur Verfügung stehen, so beträgt die Gesamtkapazität insgesamt 120 Duplexkanäle. Ein DECT-Schnurlossystem wählt dann automa- tisch den Kanal mit der jeweils besten Verbindungsqualität aus . Figur 1 zeigt im unteren Teil schematisch die Zusammensetzung eines einzelnen Zeitschlitzes von insgesamt 416, 6 μs Dauer, entsprechend 480 Bit. Zunächst ist ein 60 Bit aufweisendes Schutzband vorhanden, um eine sichere Trennung benachbarter Zeitschlitze zu ermöglichen. Von den verbleibenden 420 Bit entfallen 32 Bit auf die Synchronisierung (S-Feld) und 4 Bit auf die Paritätskontrolle (X-Feld) . 64 Bit entfallen auf einen Signalisierungskanal (A-Feld) , von denen wiederum 16 Bit ein Fehlercode, beispielsweise Cyclic Redundancy Check (CRC) sind. Die verbleibenden 48 Bit stehen zur Signalisierung, beispielsweise Information für den Verbindungsaufbau, Austausch von Kennungen, Weiterleiten an eine andere Netzzelle (Handover) zur Verfügung. Die Signalisierungsrate eines Duplexkanals be- trägt somit 64 Bit/10 ms = 6,4 Kilobit/s. Die im Signalisierungskanal übertragenen Daten sind durch die Fehlerkorrekturbits vor Ubertragungsfehlern geschützt. Die 320 Bit des Nutzkanals (B-Feldes) sind dagegen nicht speziell gegen Übertragungsfehler geschützt. Die Übertragungsrate in einem Nutzkanal beträgt 32 Kilobit/s.Taking into account that, as mentioned, ten carrier frequencies are available, the total capacity is a total of 120 duplex channels. A DECT cordless system then automatically selects the channel with the best connection quality. In the lower part, FIG. 1 shows schematically the composition of a single time slot with a total of 416.6 μs duration, corresponding to 480 bits. First of all, a 60-bit protective band is present in order to enable the safe separation of adjacent time slots. Of the remaining 420 bits, 32 bits are used for synchronization (S field) and 4 bits for parity control (X field). A signaling channel (A field) accounts for 64 bits, of which 16 bits are an error code, for example Cyclic Redundancy Check (CRC). The remaining 48 bits are available for signaling, for example information for establishing a connection, exchange of identifiers, forwarding to another network cell (handover). The signaling rate of a duplex channel is therefore 64 bits / 10 ms = 6.4 kilobits / s. The data transmitted in the signaling channel are protected from transmission errors by the error correction bits. The 320 bits of the user channel (B field), however, are not specially protected against transmission errors. The transmission rate in a user channel is 32 kilobit / s.
Aus der DE-195 15 546 AI ist ein Verfahren und eine Anordnung zur drahtlosen Übertragung von Sprachsignalen und von Datensignalen über denselben Funkkanal zwischen einer Sendeeinrich- tung und einer Empfangseinrichtung bekannt. In der Sendeeinrichtung werden Datensignale zusammen mit mindestens einem Steuersignal zur Kennzeichnung der Sprechpausen über denselben Funkkanal wie die Sprachsignale zur Empfangseinrichtung übertragen, in der die Datensignale von dem Steuersignal getrennt und während der Sprechpausen ausgegeben werden. Auf diese Weise können dann, wenn Sprechpausen auftreten und Sprachsignale nicht gesendet werden, auch Datensignale auf demselben Funkkanal gesendet und empfangen werden. Dies führt zu einer besseren Auslastung des drahtlosen Funkübertragungsweges bezüglich der Informationsübertragung in beiden Übertragungsrichtungen. Aus der DE-42 36 088 AI ist ein Verfahren zur Verringerung störender Auswirkungen schlechter Sprachübertragungsqualität bei einer Fernsprechverbindung mit einem schnurlosen Fernsprechgerät bekannt, bei dem das A-Feld eines DECT-Bursts für verbindungsbegleitende Informationen zuständig ist und bei dem bei Fernsprechverbindungen zwischen einem Basisstationsteil und einem Mobilteil des schnurlosen Fernsprechgerätes nach dem DECT-Standard während der ADPCM-Übertragung von Sprache durch Bitfehler auftretende Knack- und Störgeräusche durch eine in dem jeweiligen Teil des schnurlosen Fernsprechgerätes vorgenommenen Stummschaltung (Muting des Sprachsignals) verhindert werden.DE-195 15 546 AI discloses a method and an arrangement for the wireless transmission of voice signals and of data signals over the same radio channel between a transmitting device and a receiving device. In the transmitting device, data signals are transmitted together with at least one control signal for identifying the pauses in speech via the same radio channel as the speech signals to the receiving device, in which the data signals are separated from the control signal and are output during the pauses in speech. In this way, when there are pauses in speech and speech signals are not sent, data signals can also be sent and received on the same radio channel. This leads to better utilization of the wireless radio transmission path with regard to information transmission in both transmission directions. From DE-42 36 088 AI a method for reducing disruptive effects of poor voice transmission quality in a telephone connection with a cordless telephone is known, in which the A field of a DECT burst is responsible for connection-accompanying information and in the case of telephone connections between a base station part and a handset of the cordless telephone set according to the DECT standard during the ADPCM transmission of speech due to bit errors, cracking and interference noises can be prevented by muting in the respective part of the cordless telephone set (muting of the speech signal).
Treten bei einem DECT-Schnurlostelefon-Mobilteil Signalpausen, beispielsweise aufgrund einer Sprechpause des Schnurlostelefonbenutzers auf, so können entweder im B-Kanal die Umgebungsgeräusche an die Feststation und dann an den Telefonpartner übertragen werden oder das Endgerät überträgt bei Erfassung einer Signalpause ein Stummsignal (Mutesignal, bestehend aus lauter Einsen) an den Gesprächspartner. Im ersten Fall können die Umgebungsgeräusche als ziemlich störend empfunden werden, insbesondere wenn sich die Empfindlichkeit des Mikrofons an den erfaßten Signalpegel anpaßt. Wenn im zweiten Fall die Stummsignale im Nutzkanal (B-Feld) übertragen werden, werden diese auf Empfangsseite wie normale Audiodaten decodiert und erzeugen bei fehlerfreiem Empfang am Empfangslautsprecher "Ruhe". Treten jedoch Übertragungsfehler bei diesem Mute-Si- gnal auf, können statt dessen heftige Störgeräusche auftreten.If there are signal pauses in a DECT cordless telephone handset, for example due to a pause in the cordless telephone user's speech, either the ambient noise can be transmitted to the base station and then to the telephone partner in the B channel, or the terminal device transmits a silent signal when a signal pause is detected (courage signal, consisting of all ones) to the conversation partner. In the first case, the ambient noise can be perceived as being quite annoying, especially if the sensitivity of the microphone adapts to the detected signal level. If, in the second case, the mute signals are transmitted in the useful channel (B field), they are decoded on the receiving side like normal audio data and produce "silence" on the receiving loudspeaker when reception is error-free. However, if transmission errors occur with this mute signal, violent noise can occur instead.
Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Funk-Übertragung zwischen einem Sendegerät und einem Empfangsgerät sowie ein Schnurlostelefon so weiter- zuentwickeln, daß die Übertragungsqualität verbessert wird. Insbesondere soll das Auftreten von Störsignalen oder Störge- rauschen bei einer Signalpause verhindert werden. Die Erfindung schlägt ein Verfahren zur Funk-Übertragung zwischen einem Sendegerät und einem Empfangsgerät vor, bei dem bei Erfassung einer Signalpause vom Sendegerät über den Signalisierungskanal (A-Feld) ein Signalpausen-Kennzeichnungssignal an das Empfangsgerät übertragen wird, woraufhin am Empfänger während des Empfangs des Sendepausen-Kennzeichnungssignals die im Nutzkanal empfangenen Signale nicht verwendet, vorzugsweise gar nicht decodiert und/oder verstärkt werden. Da das Signalpausen-Kennzeichnungssignal im gegen Übertragungsfehler ge- schützten Signalisierungskanal (A-Feld) übertragen wird, kann das Auftreten von Übertragungsfehlern bei Signalpausen wesentlich verringert werden.The present invention is therefore based on the object of further developing a method for radio transmission between a transmitting device and a receiving device and a cordless telephone in such a way that the transmission quality is improved. In particular, the occurrence of interference signals or noise during a signal pause should be prevented. The invention proposes a method for radio transmission between a transmitter and a receiver, in which a signal pause identification signal is transmitted to the receiver when a signal pause is detected by the transmitter via the signaling channel (A field), whereupon the receiver during the reception of the Transmission pause identification signal, the signals received in the useful channel are not used, preferably not decoded and / or amplified. Since the signal pause identification signal is transmitted in the signaling channel (A field) protected against transmission errors, the occurrence of transmission errors during signal pauses can be significantly reduced.
Das erfindungsgemäße Verfahren ist insbesondere anwendbar auf digitale Schnurlostelefone nach dem DECT-Standard.The method according to the invention is particularly applicable to digital cordless telephones according to the DECT standard.
Die Erfindung schlägt auch ein Schnurlostelefon vor, das eine Einrichtung zur Erfassung einer Signalpause und eine Einrichtung zur Übertragung eines Signalpausen-Kennzeichnungssignals bei Erfassung einer Signalpause aufweist.The invention also proposes a cordless telephone which has a device for detecting a signal pause and a device for transmitting a signal pause identification signal when a signal pause is detected.
Das Funktionsprinzip des erfindungsgemäßen Verfahrens wird im folgenden beispielhaft unter Bezugnahme auf die Figuren erläutert, in denenThe principle of operation of the method according to the invention is explained below by way of example with reference to the figures in which
Figur 1 schematisch ein Beispiel einer bei dem erfindungsgemäßen Verfahren verwendete Zeitrahmenstruktur zeigt;FIG. 1 schematically shows an example of a time frame structure used in the method according to the invention;
Figur 2 ein Blockschaltbild einer bekannten Schnurlostelefonanlage nach DECT-Standard ist.Figure 2 is a block diagram of a known cordless telephone system according to the DECT standard.
Schnurlostelefone werden üblicherweise in einer Kombination aus Basisstation und einem oder mehreren Mobilstationen ver- wendet. Von der Mobilstation werden die Signale per Funk zur Basisstation weitergeleitet, die wiederum mit dem Telefon- Festnetz verbunden ist und die Signale an den Gesprächspartner übermittelt, der ein Festnetztelefon, ein Schnurlostelefon oder auch ein Mobiltelefon oder dergleichen verwenden kann. Zur Übertragung von Signalen von der Basissta- tion zum Mobilteil sind die Zeitschlitze 0 bis 11, für die Signalübermittlung vom Mobilgerät zur Basisstation (AufwärtsVerbindung) sind die Zeitschlitze 12 bis 23 reserviert. Basisstation und Mobilteil können, wie i "Figur 2 gezeigt, ausgebildet sein. Die Zentralsteuereinheit ZST des Mo- bilteils MT weist jedoch zusätzlich eine Einrichtung auf, die eine Signalpause, d.h. eine Sprechpause des Teilnehmers am Mobilteil oder dergleichen an einem unter einem festgelegten Wert liegenden Eingangspegel erkennt. Wird eine Signalpause oder Signalunterbrechung erkannt, wird ein Signalpausen- Kennzeichnungssignal P im A-Feld, d.h. dem Signalisierungskanal des Zeitschlitzes übertragen. Die Feststation erkennt das Signalpausen-Kennzeichnungssignal P im A-Feld und unterbricht die Decodierung, Verstärkung und/oder Weiterleitung der im B- Feld empfangenen Signale. Da die Signalisierungsdaten im A- Feld durch eine Fehlerkorrekturcodierung (CRC) vor Übertragungsfehlern geschützt sind, kann das Signalpausen- Kennzeichnungssignal zuverlässig übertragen werden. Eventuell in den nicht fehlerkorrekturcodierten B-Feld-Empfangsdaten enthaltene Übertragungsstörungen werden so von der Feststation nicht weitergeleitet und sind daher am Empfangsgerät nicht hörbar. Die Übertragungsqualität des erfindungsgemäßen DECT- Schnurlostelefonsystems wird daher verbessert. Cordless phones are usually used in a combination of a base station and one or more mobile stations. The signals are forwarded by radio from the mobile station to the base station, which in turn is Fixed network is connected and transmits the signals to the interlocutor, who can use a landline phone, a cordless phone or a cell phone or the like. Time slots 0 to 11 are reserved for the transmission of signals from the base station to the handset, time slots 12 to 23 are reserved for the transmission of signals from the mobile device to the base station (uplink). , Be formed as shown base station and handset can, as i "FIG. 2, the central control unit ZST of Mo bilteils MT but additionally includes means that a signal pause, ie, a speech pause of the subscriber on the handset or the like to a level lower than a predetermined value If a signal pause or signal interruption is detected, a signal pause identification signal P is transmitted in the A field, ie the signaling channel of the time slot. The base station recognizes the signal pause identification signal P in the A field and interrupts 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 transmitted reliably not forwarded by the base station and are therefore not audible on the receiving device. The transmission quality of the DECT cordless telephone system according to the invention is therefore improved.

Claims

Patentansprüche claims
1. Verfahren zur Funk-Übertragung zwischen einem Sendegerät (BS, MT) und einem Empfangsgerät (MT, BS) , wobei zur Übertragung von Sprach- und/oder Datensignalen ein Nutzkanal (B-Feld) und zur Übertragung von Signalisierungs- daten ein mit Fehlerkorrekturzeichen versehener Signalisierungskanal (A-Feld) vorgesehen ist, dadurch gekennzeichnet, daß bei Erfassung einer Signalpause vom Sendegerät (BS, MT) über den Signalisierungskanal ein Signalpausen-Kennzeichnungssignal (P) an das Empfangsgerät (MT, BS) übertragen wird, woraufhin am Empfangsgerät (MT, BS) während des Empfangs des Signalpausen-Kennzeichnungssignals (P) die im Nutzkanal empfan- genen Signale nicht weiterverarbeitet werden.1. A method for radio transmission between a transmitting device (BS, MT) and a receiving device (MT, BS), with a user channel (B field) for transmitting voice and / or data signals and one with for transmitting signaling data Error-correcting signaling channel (A field) is provided, characterized in that when a signal pause is detected by the transmitting device (BS, MT), a signal pause identification signal (P) is transmitted to the receiving device (MT, BS) via the signaling channel, whereupon the receiving device (MT, BS) while the signal pause identification signal (P) is being received, the signals received in the useful channel are not further processed.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die am Empfangsgerät (MT, BS) während des Empfangs des Si- gnalpausen-Kennzeichnungssignals im Nutzkanal empfangenen Signale nicht decodiert und/oder verstärkt werden.2. The method according to claim 1, characterized in that the signals received at the receiving device (MT, BS) during reception of the signal pause identification signal in the useful channel are not decoded and / or amplified.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Sendegerät (BS, MT) und Empfangsgerät (MT, BS) Schnurlostelefone nach dem DECT-Standard sind.3. The method according to claim 1 or 2, characterized in that the transmitting device (BS, MT) and receiving device (MT, BS) are cordless phones according to the DECT standard.
4. Schnurlostelefon zur Verwendung in einem Telefonsystem, in dem zur Übertragung von Sprach- und/oder Datensignalen ein Nutzkanal (B-Feld) und zur Übertragung von Signalisierungs- daten ein mit Fehlerkorrekturzeichen versehener Signalisierungskanal (A-Feld) vorgesehen ist, dadurch gekennzeichnet, daß das Schnurlostelefon (BS, MT) eine Einrichtung zur Erfas- sung einer Signalpause und eine Einrichtung (ZST, SVE, FKT, ANT) zur Übertragung eines Signalpausen- Kennzeichnungssignals (P) bei Erfassung einer Signalpause aufweist .4. Cordless telephone for use in a telephone system in which a user channel (B field) is provided for the transmission of voice and / or data signals and a signaling channel (A field) provided with error correction characters is provided for the transmission of signaling data, characterized in that that the cordless telephone (BS, MT) has a device for detecting a signal pause and a device (ZST, SVE, FKT, ANT) for transmitting a signal pause identification signal (P) when a signal pause is detected.
5. Schnurlostelefon nach Anspruch 4, dadurch gekennzeichnet, daß das Schnurlostelefon (BS, MT) ein digitales Schnurlostelefon nach DECT-Standard ist. 5. Cordless phone according to claim 4, characterized in that the cordless phone (BS, MT) is a digital cordless phone according to the DECT standard.
EP98934778A 1997-07-18 1998-05-25 Radio transmission method and cordless phone mainly intended for dect standards Withdrawn EP1016294A1 (en)

Applications Claiming Priority (3)

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DE19730984A DE19730984A1 (en) 1997-07-18 1997-07-18 Radio transmission method and cordless telephone, especially for the DECT standard
DE19730984 1997-07-18
PCT/DE1998/001413 WO1999004586A1 (en) 1997-07-18 1998-05-25 Radio transmission method and cordless phone mainly intended for dect standards

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FI105635B (en) * 1998-09-01 2000-09-15 Nokia Mobile Phones Ltd Method of transmitting background noise information during data transfer in data frames
CA2796965C (en) 2010-04-28 2019-04-16 Kimberly-Clark Worldwide, Inc. 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

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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

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AR009886A1 (en) 2000-05-03
CN1264523A (en) 2000-08-23
AU8430598A (en) 1999-02-10
ZA986317B (en) 1999-01-22
WO1999004586A1 (en) 1999-01-28
JP2001510972A (en) 2001-08-07
CA2297054A1 (en) 1999-01-28

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