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WO2000051264A1 - Procede permettant la mise en oeuvre de lignes descendantes diverses dans un systeme de radiocommunication amrt - Google Patents

Procede permettant la mise en oeuvre de lignes descendantes diverses dans un systeme de radiocommunication amrt Download PDF

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Publication number
WO2000051264A1
WO2000051264A1 PCT/EP1999/001304 EP9901304W WO0051264A1 WO 2000051264 A1 WO2000051264 A1 WO 2000051264A1 EP 9901304 W EP9901304 W EP 9901304W WO 0051264 A1 WO0051264 A1 WO 0051264A1
Authority
WO
WIPO (PCT)
Prior art keywords
radio transceiver
downlink channel
channel
terminal device
downlink
Prior art date
Application number
PCT/EP1999/001304
Other languages
English (en)
Inventor
Olli Piirainen
Original Assignee
Nokia Networks Oy
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 Nokia Networks Oy filed Critical Nokia Networks Oy
Priority to AU33279/99A priority Critical patent/AU3327999A/en
Priority to PCT/EP1999/001304 priority patent/WO2000051264A1/fr
Publication of WO2000051264A1 publication Critical patent/WO2000051264A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/12—Frequency diversity

Definitions

  • the present invention relates to a method for implementing downlink diversity in a radio telecommunication system operated according to time divisional multiple access (TDMA) and consisting of at least one radio transceiver device and at least one terminal device.
  • TDMA time divisional multiple access
  • Mobile telecommunication systems also called cellular systems
  • such mobile telecommunication systems consist of at least one terminal device MS which communicates with one of at least one radio transceiver devices or base stations BS constituting the telecommunication network.
  • the plurality of base stations BS are controlled by a base station controller device BSC in combination with a mobile switching service center MSC.
  • the latter one may also provide an interface to the PSTN network.
  • Transmission quality is thus adversely affected in uplink UL (from a respective terminal device MS to a respective radio transceiver device BS) as well as in downlink DL direction (from a respective radio transceiver device BS to a respective terminal device MS).
  • the diversity at the terminal device side could be implemented at the radio transceiver device side. This could be done by providing several antennas at the respective radio transceiver devices BS and to transmit the signals separately in time and phase in order to provide downlink diversity.
  • TDMA time divisional multiple access
  • this object is achieved by a method for implementing downlink diversity in a radio telecommunication system operated according to time divisional multiple access TDMA and consisting of at least one radio transceiver device and at least one terminal device, the method comprising the steps of transmitting data from said at least one radio transceiver device to a respective one of said at least one terminal devices using a first downlink channel, and transmitting the same data from said at least one radio transceiver device to said respective one of said at least one terminal devices using a second downlink channel, upon request of said respective terminal device.
  • TDMA time divisional multiple access
  • the present invention also proposes accordingly adapted terminal devices and radio transceiver devices .
  • the proposed method provides an advantage in that a similar diversity gain (as known from uplink) can be obtained in downlink without any additional hardware being required. For example, measurements of the inventor have shown that a diversity gain of about 5 dB can be obtained for a channel established in a typical urban area (TU channel) .
  • TU channel typical urban area
  • interference diversity gain can be obtained. Stated in other words, interference can be reduced, as the interference is also averaged due to the additional channel being activated, thereby providing diversity in frequency and, also possible, in time.
  • the proposed method is adaptive and activates diversity only upon request of a respective terminal device dependent on the condition of the air interface (like transmission quality and available transmission capacity) .
  • the method provides more flexibility for TDMA systems in order to make maximum use of the air interface.
  • Fig. 1 shows schematically a part of a radio telecommunication network with downlink diversity being implemented between a radio transceiver device BS and a terminal device MS;
  • Fig. 2A illustrates a flowchart of the method steps as performed on the terminal device MS side
  • Fig. 2B illustrates a flowchart of the method steps as performed on the radio transceiver device BS side
  • Fig. 3 schematically shows details concerning first and second active downlink channels on a TDMA frame level.
  • downlink diversity is realized by using frequency and/or time separation. This means, that at least two different channels (frequencies and/or time slots) are activated for transmitting the same data contained in a respective burst during a time slot of a TDMA frame to the terminal device or mobile station MS, respectively. Moreover, since downlink diversity is activated upon request, the requesting mobile station MS knows that a second channel (frequency and/or time slot) will be / is activated and waits for the second transmission of the same data, also received via a first channel .
  • the terminal station MS combines the data contained in the separately transmitted bursts in an equalizer means using either pre- or post-combining methods. This means that signal combining operations can be effected before supply of the signals to an equalizer or after being processed by an equalizer.
  • these include the following methods used for signal combination in case of diversity:
  • Equal-Gain-Combining according to which the signals to be combined are equally weighted (irrespective of their signal quality) before being combined; and 3) Selection combining, according to which the signals to be combined are not combined, but the signal with the better quality is selected.
  • the transmission of the same data as transmitted via the first (reference) channel (1 st frequency) is effected at a different frequency at the same time ("pure frequency diversity").
  • transmission of the same data as transmitted via the first channel is effected at a different or the same frequency but at a different time (i.e. during a different time slot TS of a respective TDMA frame).
  • the data are separately transmitted as regards the used channel (defined by the used frequency as well as the used time slot).
  • the data (or samples) contained in the bursts received first can be stored or buffered in the equalizer at the reception side and equalization is performed after the second burst containing the same data is received.
  • Equalization can be performed after having used any of the above mentioned combining methods. Consequently, the same receiver can receive both bursts as the different data bursts are at least separated in time and possibly also in frequency, so that in this case no additional hardware is required for a respective terminal device to carry out the proposed method.
  • DSP digital signal processing
  • the time difference between the first and second data burst transmission (when assuming that diversity uses only one additional channel, i.e. an (additional) second channel) on the first and second channel can be expressed in numbers of time slots.
  • the second transmission using the second channel can take place at a fixed time slot before the first (reference) transmission using the first channel.
  • the time slot to be used for the second channel could be configured upon activation of the second channel.
  • the use of a respective time slot for the (diversified) transmission is dependent on the availability of a "free", i.e. unused time slot, which are not occupied by other mobile stations.
  • the timing between received and transmitted time slots could be taken into account so that this does not occur at the same time, because the transmitter (of a terminal station) can disturb the receiver (of the terminal station) if transmission and reception occurs simultaneously.
  • the receiver at the terminal device used when diversity (two or more signal "branches", i.e. channels) according to the present invention is established is basically the same kind of receiver as for a single signal branch (i.e. when no diversity is established). Therefore, additional processing power is not significant. Moreover, since nowadays terminal devices are adapted to process several time slots of a respective frame, they provide enough processing power for the proposed method. Additionally, since the combining of the two signal branches is effected in the equalizer, the channel decoding processing has to be executed only once as normally and no extra signal processing is required in this connection.
  • Fig. 1 of the drawings shows schematically a part of a radio telecommunication network with downlink diversity being implemented on the air interface between a radio transceiver device BS, denoted by 1 and being provided with an antenna means 1A, and a terminal device MS, denoted by 2 and being provided with an antenna means 2A.
  • a transmission and/or communication is active between the terminal device MS 2 and the radio transceiver device BS 1 in uplink UL direction as well as in downlink direction DL, with the transmission in downlink DL being based on a first (single) downlink channel DL(Fl) based on a first frequency FI.
  • a corresponding request is forwarded from the terminal device MS 2 via for example a (logical) control channel CCH in uplink UL direction to the radio transceiver device BS 1.
  • the radio transceiver device BS 1 will allocate and/or activate a second downlink channel DL(F2) for downlink transmission between the radio transceiver device BS 1 and the terminal device MS 2, with the transmission in downlink using said second channel being based on a second frequency F2.
  • a second frequency is not necessarily required for the second channel, but the second channel can be established using a different time slot activated while still using the same frequency FI as for the first channel).
  • both downlink channels DL(F1) and DL(F2) (frequencies and/or time slots) are simultaneously active for transmitting the same data bursts thereon, thereby providing downlink diversity.
  • the conditions for issuing the request and allocating said second channel will be described further below.
  • Fig. 2A illustrates a flowchart of the method steps as performed on the terminal device MS side, with the assumption that a downlink transmission using a first downlink channel DL(F1) based on said first frequency FI is already active.
  • the flow starts in a step S10
  • the terminal device MS measures the transmission quality of the (for the concerned terminal device at present single) active downlink channel DL(F1) at the frequency FI (and a time slot within a TDMA frame).
  • step S12 it is checked in a step S12 whether the measured transmission quality is below a transmission quality threshold level.
  • the transmission quality may be defined as a received signal strength or as a bit error rate of the received signal, or the like.
  • the threshold level may be a suitable one which is predetermined for all terminal devices. Alternatively, the threshold level may be informed to the terminal device by the radio transceiver device BS dependent on a monitored location of the terminal device (e.g. in a hilly terrain or in a typical urban area), so that the threshold level may be set dependent on the environmental conditions.
  • step S12 If, in step S12, the transmission quality is not below said threshold level (NO in step S12), the flow returns to step Sll. However, if the transmission quality is below said threshold level (YES in step S12) the method flow advances to a step S13.
  • step S13 the terminal device MS issues a request to the base station BS for downlink diversity to be activated.
  • a request can be forwarded from the terminal station MS to the base station BS via a (logical) uplink control channel such as a dedicated control channel DCCH.
  • step S14 the processing as effected by the terminal station MS ends .
  • Fig. 2B a flowchart of the method steps as performed on the radio transceiver device BS side is illustrated.
  • the method starts in a step S20.
  • the radio transceiver device BS monitors the uplink dedicated control channel DCCH.
  • step S22 it is checked whether via said dedicated control channel DCCH a request for an additional channel is received from a respective terminal device MS. If no such request is received (NO in step S22), the process returns to step S21 and monitoring the dedicated control channel is continued. If, however, such a request is received at the radio transceiver device from a requesting terminal device (YES in step S22), the method proceeds to step S23.
  • transmission capacity means for example at least one available frequency at the radio transceiver device. Also, transmission capacity here could mean an available time slot in a TDMA frame transmitted on the carrier frequency of the first (downlink) transmission.
  • step S24 an other action is initiated. This means that for example a handover is initiated due to the previously measured (Sll, S12) insufficient transmission quality, or that the ongoing transmission via the active channel DL(F1) is just dropped.
  • step S27 the flow proceeds to step S27 and the method as performed by the radio transceiver device BS ends .
  • step S25 the radio transceiver device BS activates an additional channel DL(F2) from the radio transceiver device BS.
  • the additional channel is characterized by the frequency of and/or time slot used in the transmitted TDMA frame, which parameters are set when activating the additional channel.
  • the radio transceiver device BS in response to the receipt of said request for an additional channel, activates a requested additional channel at a second frequency DL(F2) and sets a time slot in a TDMA frame of said second channel DL(F2) to be used for transmission of the same data as transmitted on the first channel DL(F1).
  • the terminal station MS in a following step S26, is informed about these parameters (i.e. frequency and/or time slot defining the channel). Thereby, the terminal device is informed on which channel, i.e. on which frequency and/or at which time (time slot) the redundant data, i.e. the same data as the data transmitted via the first channel, can be received. Also, at this time, the transmission capacity information are updated in that an additional channel (frequency and time slot) has been assigned
  • Fig. 3 schematically shows details concerning first and second active downlink channels on a TDMA frame level.
  • a TDMA frame according to GSM specification has been chosen which comprises eight time slots TSO, ..., TS7 per frame.
  • TSO time slots
  • TS7 time slots
  • the present invention is also applicable without any problem to systems which have a number of time slots per TDMA frame which is different from eight, and not limited to an implementation to any of the above named specifications.
  • Fig. 3 a shows an example of the downlink channel DL(F1) at a first frequency FI.
  • the data DATA are transmitted as a burst in time slot TS5, for example. This initially active connection is defined as a reference for the subsequent explanations .
  • Fig. 3 b shows an example in which the second, additionally activated channel DL(F2) at a second frequency F2 is used to establish downlink diversity.
  • the same data DATA as the data transmitted on the first channel are transmitted at a different frequency (here F2 ) , but at the same time, i.e. during the same time slot as on the first channel (TS5 in the chosen example).
  • the implemented diversity is a "pure" frequency diversity.
  • Fig. 3 c) illustrates an example according to which the diversity is achieved by using a different frequency F2 for the second channel DL(F2) (as compared to the first channel DL(F1)) and also by using a different time.
  • F2 frequency
  • Fig. 3 c on the second channel DL(F2), the same data DATA as those transmitted on the first channel are transmitted at a different time, i.e. during a different time slot (TS1 in the chosen example).
  • This different time slot may be predetermined and fixed and differs from the time slot of the reference transmission (Fig. 3 a)) by an integer number of time slots.
  • the time slot used on the second channel may precede or follow the time slot used on the first channel (frequency) defined as a reference.
  • Fig. 3 d) shows a case in which the time slot TS to be used for the additional channel DL(F2) is configured.
  • a time slot TS1, TS2, or TS4 for example may be used for transmitting the same data DATA (in Fig. 3d) denoted by "(D)"), if time slot TS5 is used as a reference on the first channel.
  • Such a modification is advantageous in case a frequency like for example F2 is reserved for establishing downlink diversity.
  • the time slots TS available on said frequency are allocated to different diversity requesting terminal devices.
  • a time slot to be assigned for implementing diversity would have to be available on said frequency.
  • the criteria for selecting a respective time slot have been specified herein above, so that a repeated explanation thereof is considered to be dispensable.
  • the implemented diversity is a "mixed" frequency and time diversity.
  • Figs. 3c) and d) could be modified such that the second channel is active on the same transmission frequency (i.e. Fl) as the reference transmission illustrated in Fig. 3a), with the difference in channels in downlink transmission direction being manifest due to the different used time slots TS.
  • the present invention proposes a method for implementing downlink diversity in a radio telecommunication system operated according to time divisional multiple access TDMA and consisting of at least one radio transceiver device BS and at least one terminal device MS, the method comprising the steps of transmitting data from said at least one radio transceiver device BS to a respective one of said at least one terminal devices MS using a first downlink channel, and transmitting the same data from said at least one radio transceiver device BS to said respective one of said at least one terminal devices MS using a second downlink channel, upon request of said respective terminal device MS.
  • the capacities for connection provided by the air interface can be used to improve connection quality without the need to add hardware resources at the terminal device side or radio transceiver device side.

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

Abstract

La présente invention concerne une méthode permettant de mettre en oeuvre diverses lignes descendantes dans un système de radiocommunication fonctionnant selon le principe de l'accès multiple par répartition dans le temps AMRT. Ce procédé comprend au moins un dispositif émetteur récepteur radio (BS) et au moins un dispositif de terminal (MS). Il consiste à transmettre des données à partir du dispositif émetteur récepteur (BS), à destination d'un des dispositifs de terminal (MS) en utilisant un premier canal descendant (DL(F1)), et à transmettre les mêmes données à partir du dispositif émetteur récepteur (MS), à destination d'un des dispositifs de terminal (MS) en utilisant un deuxième canal descendant(DL(F2)), à la demande du dispositif de terminal respectif (MS).Les capacités de connexion offertes par l'interface hertzienne peuvent ainsi être utilisées pour améliorer la qualité des connexions sans qu'il soit nécessaire d'ajouter des ressources en matériel au niveau du dispositif de terminal ou au niveau du dispositif émetteur récepteur.
PCT/EP1999/001304 1999-02-24 1999-02-24 Procede permettant la mise en oeuvre de lignes descendantes diverses dans un systeme de radiocommunication amrt WO2000051264A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU33279/99A AU3327999A (en) 1999-02-24 1999-02-24 A method for implementing downlink diversity in a radio telecommunication systemoperated according to tdma
PCT/EP1999/001304 WO2000051264A1 (fr) 1999-02-24 1999-02-24 Procede permettant la mise en oeuvre de lignes descendantes diverses dans un systeme de radiocommunication amrt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1999/001304 WO2000051264A1 (fr) 1999-02-24 1999-02-24 Procede permettant la mise en oeuvre de lignes descendantes diverses dans un systeme de radiocommunication amrt

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
WO2002078210A3 (fr) * 2001-02-21 2003-04-03 Ericsson Inc Obtention de diversite dans un reseau de communications
EP1617571A1 (fr) * 2003-04-17 2006-01-18 Fujitsu Limited Appareil de traitement d'informations a fonction de commutation d'antenne, dispositif de communication, dispositif de commande de commutation d'antenne, programme de commande de commutation d'antenne, et support d'enregistrement lisible par ordinateur contenant ce programme
US7027424B1 (en) 2000-05-24 2006-04-11 Vtech Communications, Ltd. Method for avoiding interference in a digital communication system
WO2006042910A1 (fr) * 2004-10-21 2006-04-27 Nokia Siemens Networks Oy Transport de donnees dans un systeme gsm
WO2006125738A1 (fr) * 2005-05-23 2006-11-30 Nokia Siemens Networks Gmbh & Co. Kg Procede pour selectionner des bandes de frequences appropriees pour la transmission de donnees entre un noeud reseau et un equipement utilisateur dans un reseau de communication mobile
WO2011162983A1 (fr) * 2010-06-21 2011-12-29 Alcatel-Lucent Usa Inc. Extension de couverture à l'aide de la diversité de porteuses dans des systèmes de communication à porteuses multiples

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US5345600A (en) * 1993-08-31 1994-09-06 Motorola, Inc. Method and apparatus for selectively-enabled diversity signaling in a radio communications system
EP0735701A2 (fr) * 1995-03-31 1996-10-02 AT&T IPM Corp. Méthode et dispositif de transmission pour des systèmes de réception à diversité d'antennes commutées utilisant une procédure ARQ
US5657325A (en) * 1995-03-31 1997-08-12 Lucent Technologies Inc. Transmitter and method for transmitting information packets with incremental redundancy

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5345600A (en) * 1993-08-31 1994-09-06 Motorola, Inc. Method and apparatus for selectively-enabled diversity signaling in a radio communications system
EP0735701A2 (fr) * 1995-03-31 1996-10-02 AT&T IPM Corp. Méthode et dispositif de transmission pour des systèmes de réception à diversité d'antennes commutées utilisant une procédure ARQ
US5657325A (en) * 1995-03-31 1997-08-12 Lucent Technologies Inc. Transmitter and method for transmitting information packets with incremental redundancy

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10125728B4 (de) * 2000-05-24 2007-10-31 Vtech Communications Ltd. Verfahren zur Übertragung von Datenpaketen über eine TDMA-Datenübertragungsstrecke
US7990933B2 (en) 2000-05-24 2011-08-02 Vtech Communications, Ltd. Method for avoiding interference in a digital communication system
US7027424B1 (en) 2000-05-24 2006-04-11 Vtech Communications, Ltd. Method for avoiding interference in a digital communication system
WO2002078210A3 (fr) * 2001-02-21 2003-04-03 Ericsson Inc Obtention de diversite dans un reseau de communications
US7113745B2 (en) 2001-02-21 2006-09-26 Ericsson Inc. Method to achieve diversity in a communication network
US7800553B2 (en) 2003-04-17 2010-09-21 Fujitsu Limited Information processing apparatus with antenna switching function, communication apparatus, antenna switching control unit, antenna switching control program, and computer-readable recording medium recording the same program
EP1617571A4 (fr) * 2003-04-17 2008-05-14 Fujitsu Ltd Appareil de traitement d'informations a fonction de commutation d'antenne, dispositif de communication, dispositif de commande de commutation d'antenne, programme de commande de commutation d'antenne, et support d'enregistrement lisible par ordinateur contenant ce programme
US7606553B2 (en) 2003-04-17 2009-10-20 Fujitsu Limited Information processing apparatus with antenna switching function, communication apparatus, antenna switching control unit and computer-readable recording medium recording antenna switching control program
EP1617571A1 (fr) * 2003-04-17 2006-01-18 Fujitsu Limited Appareil de traitement d'informations a fonction de commutation d'antenne, dispositif de communication, dispositif de commande de commutation d'antenne, programme de commande de commutation d'antenne, et support d'enregistrement lisible par ordinateur contenant ce programme
WO2006042910A1 (fr) * 2004-10-21 2006-04-27 Nokia Siemens Networks Oy Transport de donnees dans un systeme gsm
WO2006125738A1 (fr) * 2005-05-23 2006-11-30 Nokia Siemens Networks Gmbh & Co. Kg Procede pour selectionner des bandes de frequences appropriees pour la transmission de donnees entre un noeud reseau et un equipement utilisateur dans un reseau de communication mobile
US8306009B2 (en) 2005-05-23 2012-11-06 Nokia Siemens Networks Gmbh & Co. Kg Method of selecting suitable frequency bands for data transmission between a network node and a user equipment within a mobile communications network
WO2011162983A1 (fr) * 2010-06-21 2011-12-29 Alcatel-Lucent Usa Inc. Extension de couverture à l'aide de la diversité de porteuses dans des systèmes de communication à porteuses multiples

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