EP1016294A1 - Procede de radiotransmission et telephone sans fil, notamment pour norme dect - Google Patents

Procede de radiotransmission et telephone sans fil, notamment pour norme dect

Info

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Withdrawn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)
English (en)
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1016294A1 publication Critical patent/EP1016294A1/fr
Withdrawn legal-status Critical Current

Links

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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de radiotransmission entre un appareil émetteur et un appareil récepteur. Selon ce procédé, un canal utile (zone B) est prévu pour la transmission de signaux vocaux et/ou de signaux de données, et un canal de signalisation (zone A) comportant un signe de correction d'erreur est prévu pour la transmission de données de signalisation. Lorsqu'une pause de signalisation est détectée, l'appareil émetteur envoie un signal d'identification de pauses de signalisation (P) à l'appareil récepteur par l'intermédiaire du canal de signalisation, puis les signaux reçus pendant la réception du signal d'identification de pauses de signalisation au niveau du canal utile (zone B) ne sont pas utilisés au niveau de l'appareil récepteur. Etant donné que le canal de signalisation comporte une correction d'erreurs, aucun signal n'est émis, de façon fiable, pendant la pause de signalisation au niveau de l'appareil récepteur, et les erreurs de transmission pouvant éventuellement se produire dans le canal utile, lors de la transmission, pendant la pause de signalisation ou après actionnement d'une touche de discrétion, peuvent être évitées.
EP98934778A 1997-07-18 1998-05-25 Procede de radiotransmission et telephone sans fil, notamment pour norme dect Withdrawn EP1016294A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19730984A DE19730984A1 (de) 1997-07-18 1997-07-18 Funk-Übertragungsverfahren und Schnurlostelefon, insbesondere für DECT-Standard
DE19730984 1997-07-18
PCT/DE1998/001413 WO1999004586A1 (fr) 1997-07-18 1998-05-25 Procede de radiotransmission et telephone sans fil, notamment pour norme dect

Publications (1)

Publication Number Publication Date
EP1016294A1 true EP1016294A1 (fr) 2000-07-05

Family

ID=7836206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98934778A Withdrawn EP1016294A1 (fr) 1997-07-18 1998-05-25 Procede de radiotransmission et telephone sans fil, notamment pour norme dect

Country Status (9)

Country Link
EP (1) EP1016294A1 (fr)
JP (1) JP2001510972A (fr)
CN (1) CN1264523A (fr)
AR (1) AR009886A1 (fr)
AU (1) AU8430598A (fr)
CA (1) CA2297054A1 (fr)
DE (1) DE19730984A1 (fr)
WO (1) WO1999004586A1 (fr)
ZA (1) ZA986317B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI105635B (fi) * 1998-09-01 2000-09-15 Nokia Mobile Phones Ltd Menetelmä taustakohinainformaation lähettämiseksi tietokehysmuotoisessa tiedonsiirrossa
CA2796965C (fr) 2010-04-28 2019-04-16 Kimberly-Clark Worldwide, Inc. Procede d'augmentation de la permeabilite d'une barriere epitheliale
JP6055431B2 (ja) * 2014-03-13 2016-12-27 サクサ株式会社 コードレス電話装置及び無線通信方法
JP7042463B2 (ja) * 2018-06-13 2022-03-28 パナソニックＩｐマネジメント株式会社 コードレス電話機およびベースユニット

Family Cites Families (6)

* Cited by examiner, † Cited by third party
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 (de) * 1992-10-26 1994-04-28 Siemens Ag Verfahren zur Verringerung störender Auswirkungen schlechter Sprachübertragungsqualität bei einer Fernsprechverbindung mit einem schnurlosen Fernsprechgerät
JP3090842B2 (ja) * 1994-04-28 2000-09-25 沖電気工業株式会社 ビタビ復号法に適応した送信装置
FI99066C (fi) * 1995-01-31 1997-09-25 Nokia Mobile Phones Ltd Tiedonsiirtomenetelmä
FI100932B (fi) * 1995-04-12 1998-03-13 Nokia Telecommunications Oy Äänitaajuussignaalien lähetys radiopuhelinjärjestelmässä
DE19515546C2 (de) * 1995-04-27 1999-01-07 Siemens Ag Verfahren und Anordnung zur drahtlosen Übertragung von Sprachsignalen und von Datensignalen über denselben Funkkanal zwischen einer Sendeeinrichtung und einer Empfangseinrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9904586A1 *

Also Published As

Publication number Publication date
CA2297054A1 (fr) 1999-01-28
CN1264523A (zh) 2000-08-23
DE19730984A1 (de) 1999-02-11
ZA986317B (en) 1999-01-22
AU8430598A (en) 1999-02-10
WO1999004586A1 (fr) 1999-01-28
AR009886A1 (es) 2000-05-03
JP2001510972A (ja) 2001-08-07

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