WO2005025087A1 - Method for transmitting signals from a transmitting station to a receiving station in a radiocommunication system - Google Patents

Method for transmitting signals from a transmitting station to a receiving station in a radiocommunication system Download PDF

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Publication number
WO2005025087A1
WO2005025087A1 PCT/EP2004/051582 EP2004051582W WO2005025087A1 WO 2005025087 A1 WO2005025087 A1 WO 2005025087A1 EP 2004051582 W EP2004051582 W EP 2004051582W WO 2005025087 A1 WO2005025087 A1 WO 2005025087A1
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WIPO (PCT)
Prior art keywords
station
frequencies
receiving station
transmitting
msi
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PCT/EP2004/051582
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German (de)
French (fr)
Inventor
Thomas Jatschka
Alfred Pohl
Robert Tschofen
Original Assignee
Siemens Aktiengesellschaft
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Publication of WO2005025087A1 publication Critical patent/WO2005025087A1/en

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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
    • H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H04B7/0608—Antenna selection according to transmission parameters
    • H04B7/061—Antenna selection according to transmission parameters using feedback from receiving side
    • 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 invention relates to a method for signal transmission from a transmitting station to a receiving station in a radio communication system, and to a corresponding transmitting station.
  • directional antenna devices are used to emit signals in certain directions.
  • Directional antenna devices consist of several antennas that emit a signal to be transmitted, each with a different amplitude and / or phase position. Through constructive and destructive interference of the phase-shifted signals of the individual antennas, a radiation characteristic of the directional antenna device arises, which can be adjusted by changing the individual amplitudes and phase positions.
  • Some radio communication systems for example radio communication systems according to the GSM standard (GSM: Global System for Mobile Communications), already use directional antenna devices, which are also referred to as "intelligent antennas" (English: smart antennas) a signal emitted by a frequency through repeated information from a receiving station, the phase position of the individual antennas are adjusted so that the antenna device is radiated in the direction of the receiving station, but this requires a high computing power and is therefore only installed in fixed installations Stations, for example base stations, are used. This technology cannot be used in portable stations, for example mobile stations.
  • GSM Global System for Mobile Communications
  • the invention is therefore based on the object of specifying an advantageous method for signal transmission from a transmitting station to a receiving station in a radio communication system and a transmitting station, with which the use of a directional antenna device is also made possible for a portable transmitting station.
  • the transmitting station sends, with a directional antenna device, at least one signal with at least two frequencies in at least one direction, defined for each frequency, to the receiving station.
  • the sending station receives information about a reception quality for at least one of the frequencies from the receiving station and uses the information to determine the frequency at which it subsequently transmits further signals in the correspondingly defined direction to the receiving station.
  • a directional antenna device consists of several, for example two or three, individual antennas which are used to transmit a signal, for example a sinusoidal e- electromagnetic wave, each send out the signal.
  • the individual antennas can use different amplitudes and have different phase positions for the signal from one another. This creates a direction-dependent radiation of the signal, ie the radiated signal strength is a function of the direction.
  • Useful data and signaling data to be transmitted are modulated onto the signal.
  • Known stations with directional antenna devices use one or more frequencies for signal transmission to a receiving station and change the phase position for each frequency between the individual antennas of the directional antenna device, ie the radiation characteristic of the frequencies, until a desired reception quality is achieved at the receiving station.
  • the transmitting station can use a simpler and therefore more cost-effective directional antenna device with a radiation direction that is fixed for each frequency, ie, at least during the signal transmission, unchangeable.
  • the sending station can select the frequency for signal transmission that causes the highest reception quality at the receiving station.
  • the invention enables, for example, the invention to be used in portable transmitting stations, for example mobile telephones or portable computers, since the selection of a frequency based solely on the information according to the invention of the receiving station requires less signaling effort than a change in the phase position of the individual antennas when using a predetermined frequency usually based on a variety of information.
  • several frequencies are set for the transmission of the further signals. If the information for a plurality of frequencies results in a reception quality which, for example, exceeds a specific desired value, a high data rate and / or a further improved reception quality can be achieved if the corresponding frequencies are subsequently used for signal transmission.
  • the transmitting station can use multiple frequencies with less signaling effort by the invention.
  • radio communication system is operated with a frequency hopping method, in particular according to the Bluetooth standard, or if the signal transmission is carried out using OFDM (Orthogonal Frequency Division Multiplex).
  • OFDM Orthogonal Frequency Division Multiplex
  • the frequencies are set repeatedly during an existing connection. Since the receiving station can in particular also be a mobile station, for example a mobile phone or a portable computer, it is advantageous to repeat the frequencies used and thus the directions in which the signals are transmitted to the Adjust position in which the receiving station is located relative to the sending station.
  • the time interval in which the frequencies used are repeatedly determined can be from the speed of the receiving station and / or the rate of change of the reception qualities of the currently used frequencies.
  • the transmitting station according to the invention and the computer program according to the invention have all the features required for carrying out the method according to the invention.
  • FIG. 1 shows a schematic illustration of a transmitting station according to the invention
  • Fig. 2 is a schematic representation of a signal transmission according to the invention from the sending station according to Figure 1 to a receiving station.
  • a sending station or a receiving station is any station that can send and / or receive signals.
  • a sending or a receiving station is, for example, a mobile phone, a base station or a portable or stationary device for transmitting image and / or sound data, for sending faxes, short messages, SMS and email, and for Internet access. It is therefore a matter of general transmitting and / or receiving units of a radio communication system.
  • the invention can advantageously be used in any radio communication system.
  • Radio communication systems are systems in which signals are transmitted between stations via a radio interface. The signal can be transmitted both bidirectionally and unidirectionally.
  • Radio communication systems are any mobile radio systems, for example according to the GSM (Global System for Mobile Communications) or UMTS (Universal Mobile Telecommunications System) standard.
  • Future mobile radio systems for example of the fourth generation, are also to be understood as radio communication systems.
  • the invention can be used particularly advantageously in radio communication systems with frequency hopping, for example in accordance with the Bluetooth standard, or for signal transmissions using OFDM (Orthogonal Frequency Division Multiplex).
  • OFDM Orthogonal Frequency Division Multiplex
  • a transmitting station MSI is shown schematically in FIG.
  • the transmitting station MSI has a directional antenna device RV consisting of two antennas AI, A2.
  • the two antennas AI, A2 are connected to a transmitting and receiving unit SEI, which is controlled by a control unit P1.
  • the control unit Pl and the transmitting and receiving unit SEI transmit a signal to be transmitted with a phase position defined for each antenna from both antennas AI, A2 at the same time. H.
  • a different radiation characteristic of the directional antenna device RV arises.
  • the antennas AI, A2 are assigned fixed phase shifters, for example, which are frequency-dependent
  • Phase shifting means that different phase positions occur on the individual antennas for each transmitted frequency and thus different radiation characteristics arise.
  • the directional antenna device RV can also consist of more than two antennas to which, for example, fixed phase shifters are assigned.
  • the directional antenna device RV i. H. their frequency-dependent radiation characteristics can be configured as desired before being used according to the invention.
  • the directional antenna device RV uses phase shifters, the phase shift of which can be set in principle, but which is set once before the use according to the invention and is no longer changed at least while the method according to the invention is being carried out.
  • the phase shifters have an invariable phase shift.
  • FIG. 2 schematically shows an exemplary embodiment of a signal transmission according to the invention with a definition of frequencies.
  • new frequencies fl, ..., f9 can be used for signal transmissions.
  • the transmitting station MSI is shown schematically by the directional antenna device RV with the two antennas AI, A2.
  • the transmitting station MSI is designed such that it can transmit signals to a receiving station MS2 on nine frequencies fl, f2, f3, f4, f5, f ⁇ , f7, f8, f9.
  • the directional antenna device RV is fixed in this embodiment such that each of the nine frequencies fl, ..., f9 is sent in two opposite directions.
  • the sending station MSI first sends a signal S on all nine frequencies fl, ..., f9 to the receiving station MS2.
  • the receiving station MS2 is designed so that all frequencies used in the radio communication system are known to it. It tries to receive the signal S with a transmitting and receiving unit SE2, which is controlled by a control unit P2, on all frequencies used by the transmitting station.
  • the receiving station MS2 receives the signal S only on the first three frequencies fl, f2, f3 and then sends information I to the transmitting station MSI, from which the transmitting station MSI can derive a reception quality for each of the three frequencies fl, f2, f3 ,
  • the sending station MSI can also transmit the signal S on fewer frequencies than are available in the radio communication system.
  • the receiving station MS2 is informed of this by appropriate information, for example by broadcasting the corresponding information.
  • the receiving station MS2 can then only receive on the frequencies used by the sending station MSI.
  • the control unit P1 of the transmitting station MSI can determine that the other six frequencies f4, ..., f9 are not received by the receiving station MS2 and therefore specifies that the latter is used for a subsequent signal transmission to the receiving station Station MS2 cannot be used. Furthermore, the reception quality for the third frequency f3 is too low, so that the third frequency f3 is also not used for the subsequent signal transmission. det.
  • the first and second frequencies f1, f2 have a reception quality that exceeds a specific setpoint, for example determined by the receiving station, and are therefore defined and used for the subsequent signal transmission for the transmission of further signals SI.
  • the signal S is, for example, a test signal that is emitted exclusively to determine the frequencies.
  • the signal S can already be a signal which, like the other signals SI, has modulated useful and / or signaling data for the receiving station MS2.
  • the method according to the invention can also be carried out with any other number of frequencies available in the radio communication system and it is also possible for any number of frequencies to be defined for the transmission of the further signals SI.
  • the use of the invention for frequency hopping methods is particularly advantageous.
  • the invention uses only those frequencies for the frequency hopping method which are emitted in the direction of the receiving station and are well received by the latter. Even with a signal transmission using OFDM, the invention has the advantage that only those orthogonal frequencies are used that are sent in the direction of the receiving station.
  • the signal S In order to enable the best possible definition of the frequencies for an existing connection between the sending station MSI and the receiving station MS2, the signal S repeatedly transmitted on all nine frequencies fl, ..., f9 during the connection in order to be able to update the definition of the frequencies used. This is necessary because the receiving station MS2 is a mobile station whose position relative to the sending station MSI does not have to be constant over time. Furthermore, an update of the frequencies may be necessary due to changing frequency properties of the transmission path.
  • Due to the repeated transmission of the signal S and the resulting re- sulting repeated reception of an information on the reception quality received from the receiving station MS2 frequencies may If the 'part of the information, the previously received frequencies is concerned, also the indication a change in the respective reception quality, which can be coded for the corresponding frequencies with one bit each.
  • the receiving station MS2 can also have a corresponding directional antenna device and, in turn, define frequencies that are used for transmitting signals to the transmitting station MSI.
  • the frequencies determined by the receiving station MS2 can of course differ from the frequencies defined by the transmitting station MSI or can also agree with them.
  • the transmission of the signal S and the further signals SI, the reception and evaluation of the information I and the definition of the frequency or frequencies used for the further signals SI can be controlled by a computer program which runs in the transmitting station MSI, ie running on a computer or processor.
  • the computer program is either stored in a memory of the the MSI station loaded and executed from there or it is on a data carrier, for example a floppy disk, a CD (Compact Disc), a DVD (Digital Versatile Disc) or a remote server.
  • the computer station is accessed by the sending station MSI via a corresponding reading device or a data line or a radio link.

Abstract

The invention relates to a method for transmitting signals from a transmitting station (MS1) to a receiving station (MS2) in a radiocommunication system, wherein the transmitting station (MS1) transmits, by means of a directional antenna device (RV), at least one signal (S) with at least two frequencies (f1, f2, f3, f4, f5, f6, f7, f8, f9) in at least one respective direction, which is determined for each frequency (f1, f2, f3, f4, f5, f6, f7, f8, f9), to said receiving station (MS2). The transmitting station (MS1) receives information (I) on reception quality for at least one of the frequencies (f1, f2, f3) of the receiving station (MS2) and uses said information (I) to determine which frequency (f1, f2) it will subsequently send other signals (S1) in the correspondingly determined direction to the receiving station (MS2).

Description

Beschreibungdescription
Verfahren zur Signalübertragung von einer sendenden Station an eine empfangende Station in einem FunkkorrvmunikationsSystem sowie sendende StationMethod for signal transmission from a sending station to a receiving station in a radio communication system and transmitting station
Die Erfindung betrifft ein Verfahren zur Signalübertragung von einer sendenden Station an eine empfangende Station in einem Funkkommunikationssystem,- sowie eine entsprechende sen- dende Station.The invention relates to a method for signal transmission from a transmitting station to a receiving station in a radio communication system, and to a corresponding transmitting station.
In Funkkommunikationssystemen werden Richtantennenvorrichtungen zur Abstrahlung von Signalen in bestimmte Richtungen verwendet. Richtantennenvorrichtungen bestehen aus mehreren An- tennen, die ein zu übertragende-s Signal mit jeweils unterschiedlicher Amplitude und/oder Phasenlage aussenden. Durch konstruktive und destruktive Interferenz der phasenverschobenen Signale der einzelnen Antennen, entsteht eine Abstrahlcharakteristik der Richtantennenvorrichtung, die durch Verän- derung der einzelnen Amplituden und Phasenlagen einstellbar ist.In radio communication systems, directional antenna devices are used to emit signals in certain directions. Directional antenna devices consist of several antennas that emit a signal to be transmitted, each with a different amplitude and / or phase position. Through constructive and destructive interference of the phase-shifted signals of the individual antennas, a radiation characteristic of the directional antenna device arises, which can be adjusted by changing the individual amplitudes and phase positions.
Einige Funkkommunikationssysteme, beispielsweise Funkkommunikationssysteme gemäß dem GSM-Standard (GSM: Global System for Mobile Communications) , verwenden bereits Richtantennenvorrichtungen, die auch als „intelligente Antennen" (engl.: smart antennas) bezeichnet werden. So kann für ein von einer sendenden Station mit einer Frequenz abgestrahltes Signal durch wiederholte Informationen von einer empfangenden Stati- on, die Phasenlage der einzelnen Antennen so angepasst werden, dass die Abstrahlung der Antennenvorrichtung in Richtung der empfangenden Station erfolgt. Dies erfordert jedoch eine hohe Rechenleistung und wird daher nur in fest installierten Stationen, beispielsweise Basisstationen, verwendet. In tragbaren Stationen, beispielsweise Mobilstationen, lässt sich diese Technik nicht einsetzen.Some radio communication systems, for example radio communication systems according to the GSM standard (GSM: Global System for Mobile Communications), already use directional antenna devices, which are also referred to as "intelligent antennas" (English: smart antennas) a signal emitted by a frequency through repeated information from a receiving station, the phase position of the individual antennas are adjusted so that the antenna device is radiated in the direction of the receiving station, but this requires a high computing power and is therefore only installed in fixed installations Stations, for example base stations, are used. This technology cannot be used in portable stations, for example mobile stations.
Der Erfindung liegt daher die Aufgabe zugrunde, ein vorteilhaftes Verfahren zur Signalübertragung von einer sendenden Station an eine empfangende Station in einem Funkkommunikationssystem sowie eine sendende Station anzugeben, mit denen der Einsatz einer Richtantennenvorrichtung auch für eine tragbare sendende Station ermöglicht wird.The invention is therefore based on the object of specifying an advantageous method for signal transmission from a transmitting station to a receiving station in a radio communication system and a transmitting station, with which the use of a directional antenna device is also made possible for a portable transmitting station.
Diese Aufgabe wird mit dem Verfahren sowie der sendenden Station gemäß den unabhängigen Ansprüchen gelöst .This object is achieved with the method and the transmitting station in accordance with the independent claims.
Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.Advantageous developments of the invention are the subject of the dependent claims.
Bei dem erfindungsgemäßen Verfahren zur Signalübertragung von einer sendenden Station an eine empfangende Station in einem Funkkommunikationssystem sendet die sendende Station mit einer Richtantennenvorrichtung wenigstens ein Signal mit wenigstens zwei Frequenzen in wenigstens je eine, für jede Frequenz festgelegte Richtung zur empfangenden Station. Erfindungsgemäß empfängt die sendende Station eine Information ü- ber eine Empfangsqualität für wenigstens eine der Frequenzen von der empfangenden Station und legt anhand der Information fest, auf welcher Frequenz sie nachfolgend weitere Signale in der entsprechend festgelegten Richtung an die empfangende Station überträgt .In the method according to the invention for signal transmission from a transmitting station to a receiving station in a radio communication system, the transmitting station sends, with a directional antenna device, at least one signal with at least two frequencies in at least one direction, defined for each frequency, to the receiving station. According to the invention, the sending station receives information about a reception quality for at least one of the frequencies from the receiving station and uses the information to determine the frequency at which it subsequently transmits further signals in the correspondingly defined direction to the receiving station.
Eine Richtantennenvorrichtung besteht aus mehreren, beispielsweise zwei oder drei einzelnen Antennen, die zur Übertragung eines Signals, beispielsweise einer sinusförmigen e- lektromagnetischen Welle, jeweils das Signal aussenden. Die einzelnen Antennen können unterschiedliche Amplituden verwenden und zueinander unterschiedliche Phasenlagen für das Signal aufweisen. Dadurch entsteht eine richtungsabhängige Ab- Strahlung des Signals, d. h. die abgestrahlte Signalstärke ist eine Funktion der Richtung. Dem Signal sind zu übertragende Nutz- und Signalisierungsdaten aufmoduliert.A directional antenna device consists of several, for example two or three, individual antennas which are used to transmit a signal, for example a sinusoidal e- electromagnetic wave, each send out the signal. The individual antennas can use different amplitudes and have different phase positions for the signal from one another. This creates a direction-dependent radiation of the signal, ie the radiated signal strength is a function of the direction. Useful data and signaling data to be transmitted are modulated onto the signal.
Bekannte Stationen mit Richtantennenvorrichtungen verwenden für eine Signalübertragung zu einer empfangenden Station eine oder mehrere Frequenzen und verändern für jede Frequenz die Phasenlage zwischen den einzelnen Antennen der Richtantennenvorrichtung, d. h. die Abstrahlcharakteristik der Frequenzen, bis eine gewünschte Empfangsqualität bei der empfangenden Station erreicht wird. Durch die Erfindung kann die sendende Station eine einfachere und somit kostengünstigere Richtantennenvorrichtung mit einer für jede Frequenz festgelegten, d. h. zumindest während der Signalübertragung unveränderlichen Abstrahlrichtung verwenden. Je nach Richtung in der sich die empfangende Station relativ zur sendenden Station befindet, kann die sendende Station diejenige Frequenz zur Signalübertragung auswählen, die bei der empfangenden Station die größte Empfangsqualität bewirkt. Dies ermöglicht beispielsweise die Erfindung in tragbaren sendenden Stationen, bei- spielsweise Mobiltelefonen oder tragbaren Computern, einzusetzen, da die Auswahl einer Frequenz allein anhand der erfindungsgemäßen Information der empfangenden Station weniger Signalisierungsaufwand erfordert, als eine Veränderung der Phasenlage der einzelnen Antennen bei Verwendung einer vorge- gebenen Frequenz anhand üblicherweise einer Vielzahl von Informationen . Vorteilhafterweise werden mehrere Frequenzen zur Übertragung der weiteren Signale festgelegt. Ergibt sich aus der Information für mehrere Frequenzen eine Empfangsqualität, die beispielsweise einen bestimmten Sollwert überschreitet, so kann eine hohe Datenrate und/oder eine weiter verbesserte Empfangsqualität erreicht werden, wenn nachfolgend die entsprechenden Frequenzen zur Signalübertragung verwendet werden. Da die Richtantennenvorrichtung nicht wie in bekannten Stationen für jede verwendete Frequenz bezüglich ihrer Abstrahlrichtung optimiert wird, bis jeweils die gewünschte Empfangsqualität erreicht ist, sondern lediglich diejenigen Frequenzen festgelegt werden, die bei einer für jede Frequenz festgelegten Abstrahlcharakteristik die gewünschte Empfangsqualität ermöglichen, kann die sendende Station durch die Erfindung mehrere Frequenzen mit geringerem Signalisierungsaufwand verwenden.Known stations with directional antenna devices use one or more frequencies for signal transmission to a receiving station and change the phase position for each frequency between the individual antennas of the directional antenna device, ie the radiation characteristic of the frequencies, until a desired reception quality is achieved at the receiving station. As a result of the invention, the transmitting station can use a simpler and therefore more cost-effective directional antenna device with a radiation direction that is fixed for each frequency, ie, at least during the signal transmission, unchangeable. Depending on the direction in which the receiving station is located relative to the sending station, the sending station can select the frequency for signal transmission that causes the highest reception quality at the receiving station. This enables, for example, the invention to be used in portable transmitting stations, for example mobile telephones or portable computers, since the selection of a frequency based solely on the information according to the invention of the receiving station requires less signaling effort than a change in the phase position of the individual antennas when using a predetermined frequency usually based on a variety of information. Advantageously, several frequencies are set for the transmission of the further signals. If the information for a plurality of frequencies results in a reception quality which, for example, exceeds a specific desired value, a high data rate and / or a further improved reception quality can be achieved if the corresponding frequencies are subsequently used for signal transmission. Since the directional antenna device is not optimized in terms of its radiation direction for each frequency used, as is known in known stations, until the desired reception quality is achieved in each case, but rather only those frequencies are determined which enable the desired reception quality with a radiation characteristic defined for each frequency, the transmitting station can use multiple frequencies with less signaling effort by the invention.
Von Vorteil ist es, mehrere Frequenzen zur Signalübertragung festzulegen, wenn das FunkkommunikationsSystem mit einem Frequenzsprungverfahren, insbesondere gemäß dem Bluetooth- Standard, betrieben wird, oder wenn die Signalübertragung mittels OFDM (Orthogonal Frequency Division Multiplex) durchgeführt wird.It is advantageous to define several frequencies for signal transmission if the radio communication system is operated with a frequency hopping method, in particular according to the Bluetooth standard, or if the signal transmission is carried out using OFDM (Orthogonal Frequency Division Multiplex).
Zweckmäßig ist, wenn die Festlegung der Frequenzen während einer bestehenden Verbindung wiederholt erfolgt. Da es sich bei der empfangenden Station insbesondere auch um eine mobile Station, beispielsweise ein Mobiltelefon bzw. ein tragbarer Computer, handeln kann, ist es vorteilhaft, die verwendeten Frequenzen und somit die Richtungen, in die die Signale über- tragen werden, wiederholt an die Position anzupassen, in der sich die empfangende Station relativ zur sendenden Station befindet. Insbesondere kann der Zeitabstand, in dem eine wiederholte Festlegung der verwendeten Frequenzen erfolgt, von der Geschwindigkeit der empfangenden Station und/oder der Änderungsrate der Empfangsqualitäten der jeweils aktuell verwendeten Frequenzen abhängig sein.It is useful if the frequencies are set repeatedly during an existing connection. Since the receiving station can in particular also be a mobile station, for example a mobile phone or a portable computer, it is advantageous to repeat the frequencies used and thus the directions in which the signals are transmitted to the Adjust position in which the receiving station is located relative to the sending station. In particular, the time interval in which the frequencies used are repeatedly determined can be from the speed of the receiving station and / or the rate of change of the reception qualities of the currently used frequencies.
Die erfindungsgemäße sendende Station sowie das erfindungsgemäße Computerprogramm weisen alle zur Durchführung des erfindungsgemäßen Verfahren benötigten Merkmale auf.The transmitting station according to the invention and the computer program according to the invention have all the features required for carrying out the method according to the invention.
Die Erfindung wird im folgenden anhand von in den Figuren dargestellten Ausführungsbeispielen näher erläutert. Es zeigen:The invention is explained in more detail below with reference to exemplary embodiments shown in the figures. Show it:
Fig. 1 eine schematische Darstellung einer erfin- dungsgemäßen sendenden Station und1 shows a schematic illustration of a transmitting station according to the invention and
Fig. 2 eine schematische Darstellung einer erfindungsgemäßen Signalübertragung von der sendenden Station gemäß Figur 1 an eine empfangende Station.Fig. 2 is a schematic representation of a signal transmission according to the invention from the sending station according to Figure 1 to a receiving station.
Gleiche Bezugszeichen in den Figuren bezeichnen gleiche Gegenstände .The same reference symbols in the figures denote the same objects.
Eine sendende Station bzw. eine empfangende Station ist jede Station, die Signale senden und/oder empfangen kann. Eine sendende bzw. eine empfangende Station ist beispielsweise ein Mobiltelefon, eine Basisstation oder auch eine ortsbewegliche oder ortsfeste Vorrichtung zur Übertragung von Bild- und/oder Tondaten, zum Fax-, Short Message Service SMS- und Email- Versand und zum Internet-Zugang. Es handelt sich mithin um allgemeine Sende- und/oder Empfangseinheiten eines Funkkommunikationssystems . Die Erfindung kann vorteilhaft in beliebigen Funkkommunikationssystemen verwendet werden. Unter FunkkommunikationsSystemen sind Systeme zu verstehen, in denen eine Signalübertra- gung zwischen Stationen über eine Funkschnittstelle erfolgt. Die Signalübertragung kann sowohl bidirektional als auch uni- direktional erfolgen. Funkkommunikationssysteme sind beliebige Mobilfunksysteme beispielsweise nach dem GSM- (Global System for Mobile Communications) oder dem UMTS- (Universal Mobi- le Telecommunications System) Standard. Auch zukünftige Mobilfunksysteme beispielsweise der vierten Generation sollen unter Funkkommunikationssystemen verstanden werden. Besonders vorteilhaft kann die Erfindung in Funkkommunikationssystemen mit Frequenzsprungverfahren, beispielsweise gemäß dem Blue- tooth-Standard, oder für Signalübertragungen mittels OFDM (Orthogonal Frequency Division Multiplex) eingesetzt werden.A sending station or a receiving station is any station that can send and / or receive signals. A sending or a receiving station is, for example, a mobile phone, a base station or a portable or stationary device for transmitting image and / or sound data, for sending faxes, short messages, SMS and email, and for Internet access. It is therefore a matter of general transmitting and / or receiving units of a radio communication system. The invention can advantageously be used in any radio communication system. Radio communication systems are systems in which signals are transmitted between stations via a radio interface. The signal can be transmitted both bidirectionally and unidirectionally. Radio communication systems are any mobile radio systems, for example according to the GSM (Global System for Mobile Communications) or UMTS (Universal Mobile Telecommunications System) standard. Future mobile radio systems, for example of the fourth generation, are also to be understood as radio communication systems. The invention can be used particularly advantageously in radio communication systems with frequency hopping, for example in accordance with the Bluetooth standard, or for signal transmissions using OFDM (Orthogonal Frequency Division Multiplex).
In Figur 1 ist schematisch eine sendende Station MSI dargestellt. Die sendende Station MSI weist eine Richtantennenvor- richtung RV bestehend aus zwei Antennen AI, A2 auf. Die beiden Antennen AI, A2 sind an eine Sende- μnd Empfangseinheit SEI angeschlossen, die von einer Steuereinheit Pl gesteuert wird. Durch die Steuereinheit Pl und die Sende- und Empfangseinheit SEI wird ein zu übertragendes Signal mit einer für jede Antenne festgelegten Phasenlage von beiden Antennen AI, A2 gleichzeitig übertragen, d. h. je nach Phasenlage entsteht eine unterschiedliche Abstrahlcharakteristik der Richtantennenvorrichtung RV. In der Sende- und Empfangseinheit SEI sind den Antennen AI, A2 beispielsweise fest eingestellte Phasen- Schieber zugeordnet, die aufgrund einer frequenzabhängigenA transmitting station MSI is shown schematically in FIG. The transmitting station MSI has a directional antenna device RV consisting of two antennas AI, A2. The two antennas AI, A2 are connected to a transmitting and receiving unit SEI, which is controlled by a control unit P1. The control unit Pl and the transmitting and receiving unit SEI transmit a signal to be transmitted with a phase position defined for each antenna from both antennas AI, A2 at the same time. H. Depending on the phase position, a different radiation characteristic of the directional antenna device RV arises. In the transmitting and receiving unit SEI, the antennas AI, A2 are assigned fixed phase shifters, for example, which are frequency-dependent
Phasenverschiebung bewirken, dass für jede ausgesendete Frequenz andere Phasenlagen an den einzelnen Antennen auftreten und somit unterschiedliche Abstrahlcharakteristiken entstehen.Phase shifting means that different phase positions occur on the individual antennas for each transmitted frequency and thus different radiation characteristics arise.
Selbstverständlich kann die Richtantennenvorrichtung RV auch aus mehr als zwei Antennen bestehen, denen beispielsweise jeweils fest eingestellte Phasenschieber zugeordnet sind. Durch Festlegung der Anzahl von Antennen und durch Festlegung der durch die jeweiligen Phasenschieber bewirkten Phasenverschiebungen, kann die Richtantennenvorrichtung RV, d. h. ihre fre- quenzabhängige Abstrahlcharakteristik, vor einer erfindungsgemäßen Verwendung beliebig konfiguriert werden.Of course, the directional antenna device RV can also consist of more than two antennas to which, for example, fixed phase shifters are assigned. By specifying the number of antennas and specifying the phase shifts caused by the respective phase shifters, the directional antenna device RV, i. H. their frequency-dependent radiation characteristics can be configured as desired before being used according to the invention.
Als fest eingestellte Phasenschieber verwendet die Richtantennenvorrichtung RV Phasenschieber, deren Phasenverschiebung zwar prinzipiell eingestellt werden kann, die jedoch vor der erfindungsgemäßen Verwendung einmal fest eingestellt und zumindest während der Durchführung des erfindungsgemäßen Verfahrens nicht mehr verändert werden. Alternativ kann auch eine Richtantennenvorrichtung verwendet werden, der Phasen- Schieber eine unveränderliche Phasenverschiebung aufweisen.As a fixed phase shifter, the directional antenna device RV uses phase shifters, the phase shift of which can be set in principle, but which is set once before the use according to the invention and is no longer changed at least while the method according to the invention is being carried out. Alternatively, a directional antenna device can also be used, the phase shifters have an invariable phase shift.
In Figur 2 ist schematisch ein Ausführungsbeispiel einer erfindungsgemäßen Signalübertragung mit einer Festlegung von Frequenzen dargestellt. In dem FunkkommunikationsSystem kön- nen neuen Frequenzen fl, ..., f9 für Signalübertragungen verwendet werden. Die sendende Station MSI ist schematisch durch die Richtantennenvorrichtung RV mit den beiden Antennen AI, A2 dargestellt. Die sendende Station MSI ist so ausgebildet, dass sie auf neun Frequenzen fl, f2, f3, f4, f5, fβ, f7, f8, f9 Signale an eine empfangende Station MS2 übertragen kann.FIG. 2 schematically shows an exemplary embodiment of a signal transmission according to the invention with a definition of frequencies. In the radio communication system, new frequencies fl, ..., f9 can be used for signal transmissions. The transmitting station MSI is shown schematically by the directional antenna device RV with the two antennas AI, A2. The transmitting station MSI is designed such that it can transmit signals to a receiving station MS2 on nine frequencies fl, f2, f3, f4, f5, fβ, f7, f8, f9.
Die Richtantennenvorrichtung RV ist in diesem Ausführungsbeispiel derart fest eingestellt, dass jede der neun Frequenzen fl, ..., f9 in jeweils zwei entgegengesetzte Richtungen ausgesendet wird.The directional antenna device RV is fixed in this embodiment such that each of the nine frequencies fl, ..., f9 is sent in two opposite directions.
Die sendende Station MSI sendet zunächst ein Signal S auf al- len neun Frequenzen fl, ..., f9 zur empfangenden Station MS2 aus. Die empfangende Station MS2 ist so ausgebildet, dass ihr alle in dem Funkkommunikationssystem verwendeten Frequenzen bekannt sind. Sie versucht das Signal S mit einer Sende- und Empfangseinheit SE2, die von einer Steuereinheit P2 gesteuert wird, auf allen von der sendenden Station verwendeten Frequenzen zu empfangen. Die empfangende Station MS2 empfängt das Signal S lediglich auf den ersten drei Frequenzen fl, f2, f3 und sendet daraufhin eine Information I an die sendende Station MSI, der die sendende Station MSI für jede der drei Frequenzen fl, f2, f3 eine Empfangsqualität entnehmen kann.The sending station MSI first sends a signal S on all nine frequencies fl, ..., f9 to the receiving station MS2. The receiving station MS2 is designed so that all frequencies used in the radio communication system are known to it. It tries to receive the signal S with a transmitting and receiving unit SE2, which is controlled by a control unit P2, on all frequencies used by the transmitting station. The receiving station MS2 receives the signal S only on the first three frequencies fl, f2, f3 and then sends information I to the transmitting station MSI, from which the transmitting station MSI can derive a reception quality for each of the three frequencies fl, f2, f3 ,
Selbstverständlich kann die sendende Station MSI das Signal S auch auf weniger Frequenzen aussenden als im Funkkommunikationssystem zur Verfügung stehen. In diesem Fall ist es von Vorteil, wenn die empfangende Station MS2 durch eine entsprechende Information darüber informiert wird, beispielsweise durch Rundsendung der entsprechenden Information. Nachfolgend kann die empfangende Station MS2 ausschließlich auf den von der sendenden Station MSI verwendeten Frequenzen empfangen.Of course, the sending station MSI can also transmit the signal S on fewer frequencies than are available in the radio communication system. In this case, it is advantageous if the receiving station MS2 is informed of this by appropriate information, for example by broadcasting the corresponding information. The receiving station MS2 can then only receive on the frequencies used by the sending station MSI.
Anhand der Information I kann die Steuereinheit Pl der sendenden Station MSI bestimmen, dass die anderen sechs Frequenzen f4, ..., f9 nicht von der empfangenden Station MS2 empfangen werden und legt daher fest, dass diese für eine nachfol- gende Signalübertragung an die empfangende Station MS2 nicht verwendet werden. Weiterhin ist die Empfangsqualität für die dritte Frequenz f3 zu gering, so dass auch die dritte Frequenz f3 nicht für die nachfolgende Signalübertragung verwen- det wird. Die erste und zweite Frequenz fl, f2 haben eine Empfangsqualität, die einen bestimmten, beispielsweise von der empfangenden Station festgelegten, Sollwert überschreitet und werden daher für die nachfolgende Signalübertragung zur Übertragung weiterer Signale SI festgelegt und verwendet.On the basis of the information I, the control unit P1 of the transmitting station MSI can determine that the other six frequencies f4, ..., f9 are not received by the receiving station MS2 and therefore specifies that the latter is used for a subsequent signal transmission to the receiving station Station MS2 cannot be used. Furthermore, the reception quality for the third frequency f3 is too low, so that the third frequency f3 is also not used for the subsequent signal transmission. det. The first and second frequencies f1, f2 have a reception quality that exceeds a specific setpoint, for example determined by the receiving station, and are therefore defined and used for the subsequent signal transmission for the transmission of further signals SI.
Bei dem Signal S handelt es sich beispielsweise um ein Testsignal, das ausschließlich zur Festlegung der Frequenzen ausgesandt wird. Selbstverständlich kann es sich bei dem Signal S bereits um ein Signal handeln, dem wie den weiteren Signalen SI Nutz- und/oder Signalisierungsdaten für die empfangende Station MS2 aufmoduliert sind.The signal S is, for example, a test signal that is emitted exclusively to determine the frequencies. Of course, the signal S can already be a signal which, like the other signals SI, has modulated useful and / or signaling data for the receiving station MS2.
Selbstverständlich kann das erfindungsgemäße Verfahren auch mit einer beliebigen anderen Anzahl von im Funkkommunikationssystem verfügbaren Frequenzen durchgeführt werden und es ist ebenfalls möglich, dass eine beliebige Anzahl von Frequenzen zur Übertragung der weiteren Signale SI festgelegt wird.Of course, the method according to the invention can also be carried out with any other number of frequencies available in the radio communication system and it is also possible for any number of frequencies to be defined for the transmission of the further signals SI.
Besonders vorteilhaft ist die Verwendung der Erfindung für Frequenzsprungverfahren beispielsweise gemäß dem Bluetooth- Standard. Durch die Erfindung werden nur diejenigen Frequenzen für das Frequenzsprungverfahren verwendet, die in die Richtung der empfangenden Station ausgesendet und von dieser gut empfangen werden. Auch bei einer Signalübertragung mittels OFDM hat die Erfindung den Vorteil, dass nur diejenigen orthogonalen Frequenzen verwendet werden, die in Richtung der empfangenden Station gesendet werden.The use of the invention for frequency hopping methods, for example according to the Bluetooth standard, is particularly advantageous. The invention uses only those frequencies for the frequency hopping method which are emitted in the direction of the receiving station and are well received by the latter. Even with a signal transmission using OFDM, the invention has the advantage that only those orthogonal frequencies are used that are sent in the direction of the receiving station.
Um für eine bestehende Verbindung zwischen sendender Station MSI und empfangender Station MS2 eine möglichst optimale Festlegung der Frequenzen zu ermöglichen, wird das Signal S während der Verbindung wiederholt auf allen neun Frequenzen fl, ..., f9 gesendet, um die Festlegung der verwendeten Frequenzen aktualisieren zu können. Dies ist erforderlich da es sich bei der empfangenden Station MS2 um eine mobile Station handelt, deren Relativposition zur sendenden Station MSI nicht zeitlich konstant sein muss. Weiterhin kann eine Aktualisierung der Frequenzen aufgrund sich ändernder Frequenzeigenschaften des Übertragungsweges erforderlich sein. Aufgrund der wiederholten AusSendung des Signals S und des daraus re- sultierenden wiederholten Empfangs einer Information über die Empfangsqualität der von der empfangenden Station MS2 empfangenen Frequenzen, kann es sich bei dem' Teil der Information, der bereits zuvor empfangene Frequenzen betrifft, auch um die Angabe einer Änderung der jeweiligen Empfangsqualität han- dein, die für die entsprechenden Frequenzen mit jeweils einem Bit kodiert werden kann .In order to enable the best possible definition of the frequencies for an existing connection between the sending station MSI and the receiving station MS2, the signal S repeatedly transmitted on all nine frequencies fl, ..., f9 during the connection in order to be able to update the definition of the frequencies used. This is necessary because the receiving station MS2 is a mobile station whose position relative to the sending station MSI does not have to be constant over time. Furthermore, an update of the frequencies may be necessary due to changing frequency properties of the transmission path. Due to the repeated transmission of the signal S and the resulting re- sulting repeated reception of an information on the reception quality received from the receiving station MS2 frequencies may If the 'part of the information, the previously received frequencies is concerned, also the indication a change in the respective reception quality, which can be coded for the corresponding frequencies with one bit each.
Selbstverständlich kann auch die empfangende Station MS2 eine entsprechende Richtantennenvorrichtung aufweisen und ihrer- seits Frequenzen festlegen, die zur Übertragung von Signalen an die sendende Station MSI verwendet werden. Die von der empfangenden Station MS2 festgelegten Frequenzen können sich selbstverständlich von den von der sendenden Station MSI festgelegten Frequenzen unterscheiden oder auch mit ihnen ü- bereinstimmen.Of course, the receiving station MS2 can also have a corresponding directional antenna device and, in turn, define frequencies that are used for transmitting signals to the transmitting station MSI. The frequencies determined by the receiving station MS2 can of course differ from the frequencies defined by the transmitting station MSI or can also agree with them.
Das Aussenden des Signals S sowie der weiteren Signale SI, der Empfang sowie das Auswerten der Information I und die Festlegung der für die weiteren Signale SI verwendeten Fre- quenz bzw. Frequenzen können von einem Computerprogramm gesteuert werden, das in der sendenden Station MSI abläuft, d. h. auf einem Computer oder Prozessor ausgeführt wird. Das Computerprogramm wird entweder in einen Speicher der senden- den Station MSI geladen und von dort ausgeführt oder es befindet sich auf einem Datenträger, beispielsweise einer Diskette, einer CD (Compact Disc) , einer DVD (Digital Versatile Disc) oder einem entfernten Server. Der Zugriff auf das Computerprogramm erfolgt durch die sendende Station MSI über ein entsprechendes Lesegerät bzw. eine Datenleitung oder eine Funkverbindung . The transmission of the signal S and the further signals SI, the reception and evaluation of the information I and the definition of the frequency or frequencies used for the further signals SI can be controlled by a computer program which runs in the transmitting station MSI, ie running on a computer or processor. The computer program is either stored in a memory of the the MSI station loaded and executed from there or it is on a data carrier, for example a floppy disk, a CD (Compact Disc), a DVD (Digital Versatile Disc) or a remote server. The computer station is accessed by the sending station MSI via a corresponding reading device or a data line or a radio link.

Claims

Patentansprüche claims
1. Verfahren zur Signalübertragung von einer sendenden Station (MSI) an eine empfangende Station (MS2) in einem Funkkom- munikationssystem, bei dem1. Method for signal transmission from a sending station (MSI) to a receiving station (MS2) in a radio communication system in which
- die sendende Station (MSI) mit einer Richtantennenvorrichtung (RV) wenigstens ein Signal (S) mit wenigstens zwei Frequenzen (fl, f2, f3, f4, f5, fβ, f7, f8, f9) in wenigstens je eine, für jede Frequenz (fl, f2, f3, f4, f5, fβ, f , f8, f9) festgelegte Richtung zur empfangenden Station (MS2) sendet,- The transmitting station (MSI) with a directional antenna device (RV) at least one signal (S) with at least two frequencies (fl, f2, f3, f4, f5, fβ, f7, f8, f9) in at least one, for each frequency (fl, f2, f3, f4, f5, fβ, f, f8, f9) sends specified direction to the receiving station (MS2),
- die sendende Station (MSl) eine Information (I) über eine Empfangsqualität für wenigsten eine der Frequenzen (fl, f2, f3) von der empfangenden Station (MS2) empfängt, und - die sendende Station (MSI) anhand der Information (I) festlegt, auf welcher Frequenz (fl, f2) sie nachfolgend weitere Signale (SI) in der entsprechend festgelegten Richtung an die empfangende Station (MS2) überträgt.- the sending station (MSl) receives information (I) about a reception quality for at least one of the frequencies (fl, f2, f3) from the receiving station (MS2), and - the sending station (MSI) based on the information (I) determines the frequency (fl, f2) on which it subsequently transmits further signals (SI) in the correspondingly defined direction to the receiving station (MS2).
2. Verfahren nach Anspruch 1, bei dem mehrere Frequenzen (fl, f2) zur Übertragung der weiteren Signale (SI) festgelegt werden.2. The method according to claim 1, wherein a plurality of frequencies (fl, f2) for transmitting the further signals (SI) are defined.
3. Verfahren nach Anspruch 2, bei dem das Funkkommunikationssystem mit einem Frequenzsprungverfahren, insbesondere gemäß dem Bluetooth-Standard, betrieben wird.3. The method according to claim 2, wherein the radio communication system is operated with a frequency hopping method, in particular according to the Bluetooth standard.
4. Verfahren nach Anspruch 2, bei dem die Signalübertragung mittels OFDM (Orthogonal Frequency Division Multiplex) durchgeführt wird.4. The method according to claim 2, wherein the signal transmission is carried out by means of OFDM (Orthogonal Frequency Division Multiplex).
5. Verfahren nach einem der vorstehenden Ansprüche, bei dem die Festlegung der Frequenzen während einer bestehenden Verbindung wiederholt erfolgt .5. The method according to any one of the preceding claims, in which the frequencies are set repeatedly during an existing connection.
6. Sendende Station (MSI) für ein Funkkommunikationssystem - mit einer Richtantennenvorrichtung (RV) zur Aussendung wenigstens eines Signals (S) mit wenigstens zwei Frequenzen (fl, f2, f3, f4, f5, fβ, f7, f8, f9) in wenigstens je eine, für jede Frequenz (fl, f2, f3, f4, f5, fβ, f7, f8, f9) festgelegte Richtung zu einer empfangenden Station (MS2) , - mit Mitteln (SEI) zum Empfang einer Information (I) über eine Empfangsqualität für wenigsten eine der Frequenzen (fl, f2, f3) von der empfangenden Station (MS2), und6. Sending station (MSI) for a radio communication system - with a directional antenna device (RV) for transmitting at least one signal (S) with at least two frequencies (fl, f2, f3, f4, f5, fβ, f7, f8, f9) in at least one direction for each frequency (fl, f2, f3, f4, f5, fβ, f7, f8, f9) to a receiving station (MS2), - with means (SEI) for receiving information (I) about a Reception quality for at least one of the frequencies (fl, f2, f3) from the receiving station (MS2), and
- mit Mitteln (Pl) zum Festlegen anhand der Information (I) , auf welcher Frequenz (fl, f2) nachfolgend weitere Signale (SI) in der entsprechend festgelegten Richtung an die empfangende Station (MS2) übertragen werden.- With means (Pl) for determining on the basis of the information (I) on which frequency (fl, f2) subsequently further signals (SI) are transmitted in the correspondingly defined direction to the receiving station (MS2).
7. Computerprogramm, das bei seiner Ausführung in einer sendenden Station (MSI) eines FunkkommunikationsSystems die sen- dende Station (MSI) derart steuert, dass7. Computer program which, when executed in a transmitting station (MSI) of a radio communication system, controls the transmitting station (MSI) in such a way that
- die sendende Station (MSI) mit einer Richtantennenvorrichtung (RV) wenigstens ein Signal (S) mit wenigstens zwei Frequenzen (fl, f2, f3, f4, f5, fβ, f7, f8, f9) in wenigstens je eine, für jede Frequenz (fl, f2, f3, f4, f5, fβ, f7, f8, f9) festgelegte Richtung zu einer empfangenden Station (MS2) sendet,- The transmitting station (MSI) with a directional antenna device (RV) at least one signal (S) with at least two frequencies (fl, f2, f3, f4, f5, fβ, f7, f8, f9) in at least one, for each frequency (fl, f2, f3, f4, f5, fβ, f7, f8, f9) sends specified direction to a receiving station (MS2),
- die sendende Station (MSI) eine Information (I) über eine Empfangsqualität für wenigsten eine der Frequenzen (fl, f2, f3) von der empfangenden Station (MS2) empfängt, und - die sendende Station (MSI) anhand der Information (I) festlegt, auf welcher Frequenz (fl, f2) sie nachfolgend weitere Signale (SI) in der entsprechend festgelegten Richtung an die empfangende Station (MS2) überträgt. - the sending station (MSI) receives information (I) about a reception quality for at least one of the frequencies (fl, f2, f3) from the receiving station (MS2), and - the sending station (MSI) based on the information (I) determines the frequency (fl, f2) on which it subsequently transmits further signals (SI) in the correspondingly defined direction to the receiving station (MS2).
PCT/EP2004/051582 2003-09-05 2004-07-22 Method for transmitting signals from a transmitting station to a receiving station in a radiocommunication system WO2005025087A1 (en)

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