WO2007087933A1 - Procédé de signalisation d'accès aléatoire - Google Patents

Procédé de signalisation d'accès aléatoire Download PDF

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Publication number
WO2007087933A1
WO2007087933A1 PCT/EP2006/069698 EP2006069698W WO2007087933A1 WO 2007087933 A1 WO2007087933 A1 WO 2007087933A1 EP 2006069698 W EP2006069698 W EP 2006069698W WO 2007087933 A1 WO2007087933 A1 WO 2007087933A1
Authority
WO
WIPO (PCT)
Prior art keywords
random access
radio communication
communication terminal
access signal
time
Prior art date
Application number
PCT/EP2006/069698
Other languages
German (de)
English (en)
Inventor
Jörn KRAUSE
Bernhard Raaf
Ingo Viering
Original Assignee
Nokia Siemens Networks Gmbh & Co. Kg
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 Siemens Networks Gmbh & Co. Kg filed Critical Nokia Siemens Networks Gmbh & Co. Kg
Publication of WO2007087933A1 publication Critical patent/WO2007087933A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access

Definitions

  • the invention relates to a method for random access signaling for establishing a connection in a radio communication system.
  • Radio communication systems are known in which a mobile station or a radio communication terminal signals a desired connection setup for a radio transmission to be carried out by means of a random access signal via a dedicated random access channel.
  • the random access signal is transmitted repeatedly correspondingly, so that interference or interference is increasingly formed and the repeated transmission of the random access channel has a high occupancy ,
  • identification does not necessarily mean an unambiguous determination of the mobile radio device, as for example by transmission of a characteristic
  • identification can also be understood as meaning only one characterization of the mobile radio device with regard to selected parameters, which, however, does not necessarily characterize the mobile radio device clearly.
  • “Flarion” uses a "Particular Waveform” as a Random Access signal, which is transmitted during a so-called “RACH period”, ie within predetermined time periods, without a so-called “Message Part”.
  • a "message part" is provided only to a limited extent.
  • the random access signals are typically detected by means of a correlation, which is carried out with great effort. Since the received random access signal has a gaussian distributed form after the correlation, it is also distinguishable from also gaussverteilten interference signals only with great additional effort.
  • Future radio communication systems such as E-UTRA, are likely to become FDM or OFDM due to the expected high data rates.
  • Radio transmission techniques or at least FDM or OFDM-like radio transmission techniques with subcarriers.
  • the method according to the invention is based on a radio communication system in which an FDM or OFDM radio transmission or at least one FDM or OFDM-like subcarrier-based radio transmission is used.
  • a representative example is the "Single Carrier Frequency Division Multiple Access, SC-FDMA".
  • the method according to the invention describes a random access signaling for a connection setup in a radio communication system in which a frequency division multiplex radio transmission with a plurality of subcarriers is used.
  • a radio communication terminal sends a random access signal to signal a base station a desired connection setup.
  • the random access signal transmission occurs during a predetermined time period via a random access channel provided for common use by a plurality of radio communication terminals.
  • the radio communication terminal under consideration selects a small number from the subcarrier variety, which are used by the radio communication terminal for random access signaling.
  • the method according to the invention makes it possible to use very simple, quickly executed detection algorithms.
  • Subtragers used as random access signal have no Gaussian distribution due to the sub-carrier structure and are well detectable against interfering interference.
  • the detection or detection of the transmitted random access signals is reliable, prone to interference and quickly possible.
  • the identification of a mobile station is advantageously carried out in random access signaling on the basis of the sub-carrier or on the basis of the sub-carrier frequency.
  • an additional "message part" for identification of the radio communication terminal can advantageously be dispensed with.
  • This information includes, for example: - which subtrager or which (sub) frequency band is supported by the terminal for radio transmissions,
  • each radio communication terminal in each case uses a subtrager as a random access signal
  • FIG. 2 shows a second exemplary embodiment of the method according to the invention, in which a single radio communication terminal simultaneously uses two sub-carriers as a random access signal.
  • FIG. 1 shows a first exemplary embodiment of the inventive method.
  • time blocks ZBl, ZB2, ..., ZBx are provided, which are provided for the transmission of OFDM symbols SYM. Accordingly are on A vertical frequency axis "frequency" is applied to respective subtractors ST1 to STy, which are likewise used to transmit the OFDM symbols SYM.
  • a time range RAP (“Random Access Period, RAP” or “Random Access Channel Period, RACH Period”) is used whose duration is two consecutive time blocks ZB1 and ZB2 equivalent.
  • the time range RAP returns periodically over time.
  • mobile stations of subscribers can transmit their respective random access signals in order, if appropriate, to signal a connection request to a base station.
  • OFDM data transmission a transmission of OFDM user data or of OFDM symbols SYM, referred to as "OFDM data transmission", takes place.
  • a first mobile station MS1 selects a single sub-carrier ST3 from the sub-carriers ST1 to STy and uses this during the time range RAP as a random access signal RAS1 assigned to it. By selecting the sub-carrier ST3, an identification of the requesting mobile station MS1 is possible by a receiving base station.
  • a second mobile station MS2 selects a single sub-carrier ST14 from the sub-carriers ST1 to STy and uses this during the time range RAP as a random access signal RAS2 assigned to it. By selecting the subcontractor ST14 an identification of the requesting mobile station MS2 is possible by a receiving base station.
  • the transmission of the respective random access signals RAS1 and RAS2 takes place independently of the time limits of the time blocks ZB1 or ZB2, as long as they take place only within the time range RAP.
  • the duration of the random access signals RAS1 and RAS2 advantageously corresponds to the duration of a time block ZB1 or ZB2 or else to an OFDM symbol SYM.
  • the random access signal RAS1 corresponds to a sinusoidal sound oscillation of a first frequency fl
  • the random access signal RAS2 corresponds to a sinusoidal sound oscillation of a second frequency f2.
  • FIG. 2 shows a second exemplary embodiment of the method according to the invention.
  • respective time blocks ZBl, ZB2, ..., ZBx are applied, which are provided for the transmission of OFDM symbols SYM.
  • respective subtracters ST1 to STy which are likewise used to transmit the OFDM symbols SYM, are plotted on a vertical frequency axis "frequency".
  • a time range RAP (“random access period, RAP” or “random access channel period, RACH period") is used, the time lain duration of two consecutive time blocks ZBl and ZB2 corresponds.
  • the time range RAP returns periodically over time.
  • mobile stations of subscribers may transmit their respective random access signals to optionally signal a connection request to a base station.
  • a transmission of OFDM user data or of OFDM symbols SYM takes place.
  • a first mobile station MS1 now selects two subtranslators ST2 and ST9 from the sub-carriers ST1 to STy and uses them at the same time during the time range RAP as a random access signal RAS1 assigned to them.
  • a second mobile station MS2 selects from the sub-carriers ST1 to STy now two sub-carriers ST15 and ST17 and uses them at the same time during the time range RAP as a random access signal RASl assigned to it.
  • the transmission of the respective random access signals RAS1 and RAS2 takes place independently of the time limits of the time blocks ZB1 or ZB2, as long as they take place only within the time range RAP.
  • the transmission of the respective random access signals RAS1 and RAS2 takes place independently of the time limits of the time blocks ZB1 or ZB2, as long as they take place only within the time range RAP.
  • the duration of the random access signals RAS1 and RAS2 advantageously corresponds to the duration of a time block ZB1 or ZB2 or else to the duration of an OFDM symbol SYM.
  • the random access signal RAS1 corresponds to a superimposition of two tone oscillations with the frequencies fl and fl + AB1
  • the random access signal Signal RAS2 corresponds to a superimposition of two sound vibrations of the frequencies f2 and f2 + AB2.
  • RACH Random Access Channel
  • the sub-carriers are advantageously selected in such a way that, with a low PAPR, a resulting time signal has a constant hiring end. This can reduce interference.
  • the sending mobile station can be identified with little effort:
  • IFDMA Interleaved Frequency Division Multiple Access
  • IFDMA Interleaved Frequency Division Multiple Access
  • IFDMA enables the generation of signals comprising several equidistant subcarriers and having a low peak-to-average ratio. Such signals can also be generated by so-called "DFT spread OFDM" - a method with which the data transmission is carried out at LTE.
  • the channel does not affect the relative tive phases, ie the phase difference of the two signals on both frequencies and also the amplitude ratio, so that information can be transmitted by means of both sizes.
  • base stations use mutually time-synchronized time ranges RAP.
  • a radio communication terminal at the same time transmit its assignable random access signal to a plurality of base stations in order to announce a connection request.
  • the base stations respond individually to the random access signal, so that an optimized selection of a suitable base station is made possible by the radio communication terminal.
  • base stations use non-time-synchronous time ranges RAP, the respective time ranges RAP being individually assignable to their respective base stations. In this way, a targeted selection of a desired base station is made possible in that the radio communication terminal transmits the random access signal to the desired base station in the assigned time range.
  • a receiving base station By selecting the time range RAP longer than a single OFDMA symbol and / or FDMA symbol and using selected subcarriers as random access signals for a shortened period of time, a receiving base station enables detection even in the event of a missing synchronization ,
  • the subcarrier is used as a random access signal only during the duration of a single symbol.
  • the subtrager selection for random access signaling takes place randomly.
  • the mobile station selects randomly changing subtransagers for repeated random access signaling.
  • two or more subtransagers are used by a mobile station for random access signaling, in addition to the identity of the mobile station, further information related to the mobile station can be transmitted coded by selecting the subtranslators and their distances from one another.

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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 un procédé de signalisation d'accès aléatoire permettant l'établissement connexions dans un système de radiocommunication, une radiotransmission à multiplexage par répartition en fréquence comprenant une pluralité de sous-porteuses, étant employée. Un terminal de radiocommunication envoie une signal d'accès aléatoire afin de signaler à une station de base un désir d'établissement de connexion. La transmission de signal d'accès aléatoire s'effectue pendant un intervalle de temps prédéterminé par un canal d'accès aléatoire utilisé communément par une pluralité de terminaux de radiocommunication. Un terminal de radiocommunication sélectionne parmi la pluralité de sous-porteuses un nombre faible de celles-ci qui peuvent être utilisées en tant que signal d'accès aléatoire.
PCT/EP2006/069698 2006-01-31 2006-12-14 Procédé de signalisation d'accès aléatoire WO2007087933A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006004446.0 2006-01-31
DE200610004446 DE102006004446A1 (de) 2006-01-31 2006-01-31 Verfahren zur Random-Access-Signalisierung

Publications (1)

Publication Number Publication Date
WO2007087933A1 true WO2007087933A1 (fr) 2007-08-09

Family

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Application Number Title Priority Date Filing Date
PCT/EP2006/069698 WO2007087933A1 (fr) 2006-01-31 2006-12-14 Procédé de signalisation d'accès aléatoire

Country Status (2)

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DE (1) DE102006004446A1 (fr)
WO (1) WO2007087933A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0760564A2 (fr) * 1995-08-28 1997-03-05 Telia Ab Accès aléatoire dans des systèmes à multiporteuses
WO2005088853A1 (fr) * 2004-03-09 2005-09-22 Neocific Inc. Procedes et dispositif pour acces aleatoire dans des systemes de communication a ondes porteuses multiples

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4425713C1 (de) * 1994-07-20 1995-04-20 Inst Rundfunktechnik Gmbh Verfahren zur Vielträger Modulation und Demodulation von digital codierten Daten
DE19800953C1 (de) * 1998-01-13 1999-07-29 Siemens Ag Verfahren und Funk-Kommunikationssystem zur Zuteilung von Funkressourcen einer Funkschnittstelle
DE19820684A1 (de) * 1998-05-08 1999-11-11 Siemens Ag Verfahren, Mobilstation und Basisstation zum Verbindungsaufbau für eine Mobilstation eines Funk-Kommunikationssystems
WO2005086520A1 (fr) * 2004-03-09 2005-09-15 Matsushita Electric Industrial Co., Ltd. Procede d’acces aleatoire et dispositif de terminal de radiocommunication
DE102004026327A1 (de) * 2004-05-26 2005-12-15 Berlemann, L., Dipl.-Ing. Dipl.-Kfm. Verbesserung der Leistungsfähigkeit von drahtlosen Kommunikationssystemen
KR100742127B1 (ko) * 2004-06-25 2007-07-24 삼성전자주식회사 직교 주파수 분할 다중 접속 이동통신시스템에서 상향링크 랜덤 접속 채널을 송수신하기 위한 장치 및 방법

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0760564A2 (fr) * 1995-08-28 1997-03-05 Telia Ab Accès aléatoire dans des systèmes à multiporteuses
WO2005088853A1 (fr) * 2004-03-09 2005-09-22 Neocific Inc. Procedes et dispositif pour acces aleatoire dans des systemes de communication a ondes porteuses multiples

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