WO1999009679A1 - Procede et systeme de transmission radio numerique de donnees - Google Patents

Procede et systeme de transmission radio numerique de donnees Download PDF

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Publication number
WO1999009679A1
WO1999009679A1 PCT/DE1997/001735 DE9701735W WO9909679A1 WO 1999009679 A1 WO1999009679 A1 WO 1999009679A1 DE 9701735 W DE9701735 W DE 9701735W WO 9909679 A1 WO9909679 A1 WO 9909679A1
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WO
WIPO (PCT)
Prior art keywords
data
time
transmission
transmitted
time slot
Prior art date
Application number
PCT/DE1997/001735
Other languages
German (de)
English (en)
Inventor
Jürgen KOCKMANN
Uwe Sydon
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to PCT/DE1997/001735 priority Critical patent/WO1999009679A1/fr
Publication of WO1999009679A1 publication Critical patent/WO1999009679A1/fr

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Classifications

    • 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
    • H04B7/2615—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using hybrid frequency-time division multiple access [FDMA-TDMA]

Definitions

  • the present invention relates to a method and a system for digital radio transmission of data, which enables the use of DECT components, such as the baseband IC, in the 2.4 GHz ISM band.
  • the DECT standard was adopted in the early 1990s. It is the first common European standard for cordless telecommunications.
  • a DECT network is a microcellular, digital mobile network for high subscriber densities. It is primarily designed for use in buildings. However, the DECT standard can also be used outdoors. The capacity of the DECT network of around 10,000 subscribers per square kilometer makes the cordless standard an ideal access technology for network operators. According to the DECT standard, both the transmission of voice and the transmission of data signals are possible. This means that cordless data networks can also be set up on a DECT basis.
  • DECT Digital Enhanced Cordless Telecommunication
  • a digital, cordless telecommunication system for ranges below 300 has been standardized for Europe. This system in combination with the switching function of a telecommunications system is therefore suitable for mobile telephone and data traffic in an office building or on a company site.
  • the DECT functions complement a telecommunications system and thus make it the base station FS of the cordless telecommunications system.
  • Digital radio connections can be established on up to 120 channels. see the base station FS and the maximum of 120 mobile stations MS are manufactured, monitored and controlled.
  • the frequency range is 1.88 GHz to 1.9 GHz on a maximum of ten different carrier frequencies (carriers).
  • This frequency multiplex method is called FDMA (Frequency Division Multiple Access).
  • TDMA Time Division Multiple Access
  • a time-division multiplex frame thus consists of 24 channels (see FIG. 2).
  • Channel 1 to channel 12 are transmitted from the base station FS to the mobile stations MS, while channel 13 to channel 24 are transmitted in the opposite direction from the mobile stations MS to the base station FS.
  • the frame duration is 10 ms.
  • the duration of a channel (time slot, slot) is 417 ⁇ s.
  • 320 bit information e.g. voice
  • 104 bit control data synchronization, signaling and error control
  • the useful bit rate for a subscriber (channel) results from the 320 bit information within 10 ms. It is thus 32 kilobits per second.
  • Integrated modules that implement the DECT functions have been developed for fixed and mobile stations. The base station and the mobile station perform similar functions.
  • One of these integrated modules mentioned is the HF module, ie the module that performs the actual function of receiving and transmitting in the HF range.
  • a DECT channel is determined by its time slot and its carrier frequency. It should be noted that the reuse of physical channels is organized according to the DECT standard by means of dynamic channel selection. This eliminates the need for complex frequency planning, such as in cellular systems.
  • To establish a connection the signal levels of all channels are continuously measured and the interference-free channels are managed in a channel list. During a connection, the signal level of all channels and the reception quality are still monitored. If this monitoring shows that the channel currently being used was transmitted on a carrier frequency that has been disturbed (for example by the action of a transmission on the same carrier frequency from or to another base station), a different carrier frequency is automatically selected for the next active time slot which is entered in the channel list as trouble-free. This is one way of organizing channel reuse.
  • a so-called frequency hopping spread spectrum method can also be used, for example, in which the carrier frequency is changed after a predetermined period of time, for example a frame or a time slot of the transmission.
  • the DECT standard may have to be modified and adapted to local conditions. For example in the USA. can't transfer in the normal DECT range between 1.88 and 1.90 GHz, but rather the generally accessible 2.4 GHz ISM band (Industrial, Scientific, Medical) is available. Furthermore, changes would have to be made to adapt to national regulations, such as the American regulation "FCC part 15" (Federal Communications Commission). The American regulation described describes the transmission methods, transmission powers and the available bandwidth available for the air interface.
  • the object of the invention is therefore to provide a method and a system for digital radio transmission of data which make it possible to use components which have been developed for the DECT standard in order to save costs and at the same time meet the requirements of the US ISM band meet, as described for example in the regulation "FCC part 15".
  • the data will continue to be transmitted in accordance with frequency division multiplexing (FDMA) and time slot separation (TDD).
  • FDMA frequency division multiplexing
  • TDD time slot separation
  • 12 time slots are combined in a frame with a duration of 10 ms.
  • the data rate can be halved compared to the DECT standard, which results in a bandwidth that is acceptable for the US ISM band.
  • the base bandwidth can thus be suppressed below the maximum value of 1 MHz prescribed by the "FCC part 15" regulation.
  • the transmission can take place in a 2.4 GHz band, as is the case, for example, with the US ISM band.
  • the carrier frequency can be changed after one frame or time slot of the transmission.
  • bits can be transmitted per time slot, which corresponds to the DECT standard.
  • DECT components such as, for example, the baseband controller IC
  • a transmission system for digital radio transmission of data having a fixed station and at least one mobile station, between which data can be transmitted on one of a plurality of carrier frequencies.
  • a fixed station and the at least one mobile station each have a transmitting and receiving device in order to transmit the data in time slots in a time division multiplex method (TDMA), to transmit the data in accordance with a frequency division multiplex method (FDMA) and a time slot separation (TDD). to create, the data transmitted in frames with a duration of 10 ms and each frame has 12 time slots.
  • TDMA time division multiplex method
  • FDMA frequency division multiplex method
  • TDD time slot separation
  • Fig. 2 is a schematic representation of the known DECT standard
  • Fig. 3 is a schematic representation of the channel assignment when adapting the known DECT standard to the American ISM band according to the present invention.
  • FIG. 1 An arrangement for digital radio transmission of data is provided in FIG. 1.
  • a base station 1 is connected to the fixed network by means of a terminal line 10.
  • the base station 1 has an RF module 4, through which data can be transmitted or received by means of an antenna 6.
  • the RF module 4 can in particular be a so-called slow-hopping RF module, ie a particularly inexpensive RF module which, however, requires a certain period of time to change from one carrier frequency to another carrier frequency.
  • This period of time required for the carrier frequency change can correspond, for example, to the period of time which is filled by a time slot of a time division multiplex method (TDMA).
  • TDMA time division multiplex method
  • the time period is therefore between 100 ⁇ s and 1 ms and in particular between 300 ⁇ s and 500 ⁇ s.
  • a radio transmission to a mobile station 2 can take place via a radio transmission path 8 or a radio transmission to a mobile station (cordless telephone) 3 via a second radio transmission path 9.
  • All mobile stations shown in Fig. 1 have the same Chen structure, so that a more detailed explanation is only to be made using the mobile station 2 shown.
  • this mobile station 2 has an antenna 7 for receiving or transmitting data from or to the fixed station 1.
  • An RF module 5 is provided in the mobile station 2, which essentially corresponds to the RF module 4 used in the base station 1.
  • the HF module 5 of the mobile station 2 can therefore also be a so-called slow-hopping HF module.
  • the carrier frequency fx is not changed for transmission between a base station and a specific handset.
  • a so-called frequency hopping spread spectrum method can of course also be used, in which the carrier frequency is changed after a predetermined period of time, for example a frame or a time slot of the transmission.
  • the efficiency of a TDMA transmission is increased with the same effort, in particular with regard to the RF modules and with the same bandwidth of the transmission.
  • base station 2 mobile station (cordless telephone; 3 mobile station 4 RF module base station 5 RF module base station 6 antenna base station 7 antenna mobile station first radio transmission link
  • Terminal line Zx time slot (slot) f x carrier frequency

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

Abstract

L'invention concerne un système et un procédé de transmission de données, fondés, en ce qui concerne l'interface radio, sur le procédé BRT/AMRF/AMRT, avec la grille de tranches de temps associée, décrit dans la norme BECT. Selon l'invention, pour l'adaptation de la norme DECT à la régulation américaine US "FCC part 15" concernant la bande ISM, le nombre de tranches de temps d'un intervalle de temps DECT est divisé par 2, c'est-à-dire qu'un intervalle de 10 ms comprend 12 tranches de temps dans chacune desquelles 480 bits peuvent être transmis. Le débit de données est ainsi également divisé par 2, ce qui donne une largeur de bande admissible pour la bande ISM susmentionnée.
PCT/DE1997/001735 1997-08-14 1997-08-14 Procede et systeme de transmission radio numerique de donnees WO1999009679A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/DE1997/001735 WO1999009679A1 (fr) 1997-08-14 1997-08-14 Procede et systeme de transmission radio numerique de donnees

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE1997/001735 WO1999009679A1 (fr) 1997-08-14 1997-08-14 Procede et systeme de transmission radio numerique de donnees

Publications (1)

Publication Number Publication Date
WO1999009679A1 true WO1999009679A1 (fr) 1999-02-25

Family

ID=6918535

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1997/001735 WO1999009679A1 (fr) 1997-08-14 1997-08-14 Procede et systeme de transmission radio numerique de donnees

Country Status (1)

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WO (1) WO1999009679A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999056411A1 (fr) * 1998-04-29 1999-11-04 Infineon Technologies Ag Systeme de telecommunication numerique multi-abonne fonctionnant selon la technique de saut de frequence
WO2001037456A1 (fr) * 1999-11-19 2001-05-25 Siemens Information And Communication Mobile Llc Procede et systeme de radiocommunications entre une unite mobile et une base

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0415502A2 (fr) * 1989-09-01 1991-03-06 Philips Electronics Uk Limited Système de communications
EP0670640A2 (fr) * 1994-03-03 1995-09-06 Telia Ab Dispositif pour un système de radiocommunication TDMA/TDD avec une structure pour combiner des intervalles temporels
EP0767551A2 (fr) * 1995-10-02 1997-04-09 Telia Ab Méthode pour augmenter la capacité dans un système DECT

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0415502A2 (fr) * 1989-09-01 1991-03-06 Philips Electronics Uk Limited Système de communications
EP0670640A2 (fr) * 1994-03-03 1995-09-06 Telia Ab Dispositif pour un système de radiocommunication TDMA/TDD avec une structure pour combiner des intervalles temporels
EP0767551A2 (fr) * 1995-10-02 1997-04-09 Telia Ab Méthode pour augmenter la capacité dans un système DECT

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
RASKY P D ET AL: "SLOW FREQUENCY-HOP TDMA/CDMA FOR MACROCELLULAR PERSONAL COMMUNICATIONS", IEEE PERSONAL COMMUNICATIONS, vol. 1, no. 2, 1 April 1994 (1994-04-01), pages 26 - 35, XP000449743 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999056411A1 (fr) * 1998-04-29 1999-11-04 Infineon Technologies Ag Systeme de telecommunication numerique multi-abonne fonctionnant selon la technique de saut de frequence
US6741865B1 (en) 1998-04-29 2004-05-25 Infineon Technologies Ag Digital multi-subscriber radio telecommunication system working with frequency jumping
WO2001037456A1 (fr) * 1999-11-19 2001-05-25 Siemens Information And Communication Mobile Llc Procede et systeme de radiocommunications entre une unite mobile et une base

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