WO2006134032A1 - Procede pour etablir des liaisons entre des terminaux mobiles dans des reseaux de communication a largeurs de bande variables - Google Patents

Procede pour etablir des liaisons entre des terminaux mobiles dans des reseaux de communication a largeurs de bande variables Download PDF

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Publication number
WO2006134032A1
WO2006134032A1 PCT/EP2006/062791 EP2006062791W WO2006134032A1 WO 2006134032 A1 WO2006134032 A1 WO 2006134032A1 EP 2006062791 W EP2006062791 W EP 2006062791W WO 2006134032 A1 WO2006134032 A1 WO 2006134032A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmitted
bcch
frequency
bandwidth
control channel
Prior art date
Application number
PCT/EP2006/062791
Other languages
German (de)
English (en)
Inventor
Volker Breuer
Michael Färber
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 WO2006134032A1 publication Critical patent/WO2006134032A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • 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
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present invention relates to a method and a device for connection establishment by mobile terminals in communication networks with variable bandwidths according to the independent claims 1 and 9.
  • the third generation of mobile communication systems provides a variety of services, including voice data transmission (telephone conversation) and other media data transmission services (e-mail, data downloads, instant messaging, video telephony).
  • voice data transmission telephone conversation
  • media data transmission services e-mail, data downloads, instant messaging, video telephony
  • the system bandwidth set in the previous 3G standard is 5Mhz.
  • 3GPP 3rd Generation Partnership Project
  • UMTS Universal Mobile Telecommunications System
  • UTRA UMTS Terrestrial Radio Access
  • UTRA offers variable system bandwidths of 1.25, 2.5, 5, 10, 15, and 20 MHz and it is a primary goal to keep access and response times as low as possible for all devices, the most important of which are radio control channels serve the transmission of network-specific parameters such as physical information for synchronization or cell-specific data sent in the downlink direction from the base station to the mobile terminals out.
  • the system bandwidth is fixed and thus known from the outset, as well as the lower and upper limits of the frequency band used.
  • the mobile terminals are known to use the frequency band used covering the range of 890 to 915 MHz with a 200 kHz wide carrier grid. This information can be used by the mobile devices to connect and in this way very quickly to the corresponding radio control channel (Broadcast Control Channel, short BCCH).
  • BCCH Broadcast Control Channel
  • the object of the invention is a method that allows mobile terminals in 3G mobile communication systems with variable system bandwidths an efficient connection setup.
  • a base station communicates using a certain system frequency and a certain bandwidth less than or equal to the maximum system bandwidth and a specific frame structure via a radio control channel with mobile terminals.
  • Network-specific system information is transmitted from the base station to the mobile terminals via the radio control channel.
  • one or more sets of permanently transmitted sub-carriers alpha, beta, gamma of predetermined frequency are combined to form at least one so-called beacon for transmission of frequency correction information, bandwidth used and frame structure used from the base station to the mobile
  • At least one first and at least one second of the permanently transmitted subcarriers alpha and gamma are used for frequency correction
  • at least one third of the permanently transmitted subcarriers beta transmits information about the bandwidth currently being used by the radio control channel BCCH and the frame structure used
  • the permanently transmitted subcarriers alpha and gamma are used by a mobile terminal in a first step of establishing a connection to synchronize the frequency used by the mobile terminal with the system frequency used.
  • the mobile terminal uses the information transmitted on the permanently transmitted subcarrier beta for the bandwidth currently being used by the radio control channel BCCH and for the frame structure used for the reconfiguration. After the mobile terminal has been reconfigured, the system information transmitted via the radio control channel is used for the complete establishment of the connection.
  • the invention comprises a device with means for carrying out the method presented above.
  • the present invention has the advantage that mobile terminals in variable bandwidth communication networks are enabled to establish an efficient connection by introducing a two-step method. For example, instead of letting the mobile terminals test all the bandwidths possible in the system until the currently used system bandwidth is found, sets of permanently transmitted adjacent subcarriers, English Beacons, are used to transmit the basic system information.
  • the beacons have previously defined positions in the frequency band, which are known to the mobile terminals, and these positions may also be locally separated relative to the radio cells.
  • the coding and structure of the subcarriers according to the invention allow a simultaneous estimation, for example, of the exact frequency, the frame structure, and further of system-specific information such as the bandwidth of the transmitted radio control channel BCCH. This information is spread in time by the mobile terminal known code sets.
  • MIMO Multiple Input, Multiple Output
  • the frequency correction based on the first and second permanently transmitted subcarriers alpha and gamma, is performed by means of a difference method.
  • the first permanently transmitted subcarrier Alpha is used for frequency correction in the direction of a lower frequency and the second permanently transmitted subcarrier gamma is used for frequency correction in the direction of a higher frequency.
  • the transmission of the bandwidth of the radio control channel BCCH takes place on the third permanently transmitted subcarrier beta by a suitable coding in the form of temporally repeatedly transmitted symbol sequences.
  • the symbols of the bit pattern transmitted in beta in combination with the symbols transmitted to the beta allow a more accurate identification of the code used for the transmission of the BCCH.
  • the radiation of the beacons can be spatially separated from one another in order to avoid interference between adjacent cells.
  • an encryption of the transmitted bits can be carried out to increase the reception sensitivity, preferably by 16-bit Walsh codes. This corresponds to a spreading of the information in time.
  • a specific network code is sent via the beacons, which in the case of "neighbor cell monitoring” makes it possible to check whether the operation of a mobile terminal in the relevant frequency band is permitted.
  • Fig. 1 the arrangement of the subcarrier alpha, beta and gamma and the radio control channel BCCH
  • FIG. 1 illustrates the temporal and frequency-related arrangement of the subcarriers alpha, beta and gamma as well as the radio control channel BCCH according to the invention.
  • the subcarriers alpha, beta and gamma and the radio control channel BCCH are constructed in the form of individual radio channels, preferably OFDM radio channels.
  • the present invention can also be applied to other systems.
  • the subcarrier beta is located between the subcarriers alpha and gamma.
  • Other variants of the arrangement of subcarriers are conceivable.
  • a mobile terminal For establishing a connection in a mobile radio communication network, a mobile terminal must perform an initial cell search.
  • the mobile terminal needs information about the current bandwidth of the radio control channel BCCH, the may be less than or equal to the system bandwidth, information about the system frequency and the frame structure used. Due to the variable system bandwidth in 3G wireless networks, a variety of system bandwidths is possible. The possible system bandwidths are known to the mobile terminal, but not the currently used bandwidth of the radio control channel BCCH.
  • the inventive method consists of two steps, which are explained below.
  • the method according to the invention is based on the concept of permanently transmitted subcarriers, English beacons, which constantly transmit the system information necessary for establishing a connection.
  • the OFDM downlink may be used for this purpose. OFDM transfers are done using a set of subcarriers.
  • a beacon is composed of several adjacent such subcarriers.
  • the embodiment of the invention shown in FIG. 1 uses three subcarriers.
  • the positions of the beacons in the frequency band are set by default.
  • the number of beacons used is a compromise of possible spectral capacity and overhead, as well as acceptable connection setup time requirements.
  • the number and locations of the beacons also depends on availability in the frequency spectrum. Assuming that UMTS has a downlink bandwidth of 70 MHz, for example, seven beacons are sufficient for secure information transfer during call setup.
  • a beacon consists of three adjacent subcarriers alpha, beta and gamma.
  • Alpha and gamma are used for frequency correction and are preferably modulated with a symbol pattern that corresponds to a constant rotation in the vector space. This constant rotation causes a constant frequency shift.
  • the symbol patterns are chosen in the exemplary embodiment such that alpha involves a constant frequency shift in the direction of a lower frequency, while gamma includes a constant frequency shift in the direction of a higher frequency.
  • Other variants of frequency correction based on alpha and gamma are conceivable, for example, suitable differential methods that represent a frequency correction by subtraction between alpha and gamma.
  • beta includes information about the bandwidth of the radio control channel BCCH as well as information about the frame structure. The bandwidth of the BCCH is encoded by repeatedly transmitted bit patterns of a certain length.
  • the bit pattern transmitted on beta has the length 2 and consists of the symbols Bl and B2.
  • the repetition of this two-sequence code exemplifies a system bandwidth of 2.5 MHz.
  • Other bit patterns are possible, for example a 3-bit bit pattern could encode the 5 MHz system bandwidth and a 1-bit bit pattern the smallest available system bandwidth.
  • Beta may also include information on the remaining bandwidth of the system.
  • a bandwidth of the BCCH which corresponds to half the maximum system bandwidth is advantageous, since in this case the bandwidth of the BCCH and the residual bandwidth correspond. This allows the use of the same information structures for both the BCCH and the payload.
  • the beacons are sent constantly, without any performance adjustments or time interruptions.
  • the position of the beacons in the frequency band is known.
  • a mobile terminal searches for the permanently transmitted subcarriers alpha and gamma. This search is made easier by the fact that the symbols sent via alpha and gamma have a typical pattern that corresponds to a constant frequency modulation. Furthermore, in the present exemplary embodiment, the mobile terminal is known in advance how large the frequency shift transmitted by alpha and gamma is and to which frequency this frequency shift relates. In this way, the frequency of a mobile terminal to be synchronized with the system frequency.
  • a mobile terminal in a second step of the method according to the invention for establishing a connection, can receive the permanently transmitted subcarrier beta and by using signal-matched filters and using the correct system code, the frame structure of the system and the current from BCCH used to detect bandwidth. Following this, the mobile terminal can use the received information to autonomously reconfigure itself with respect to the current bandwidth of the BCCH. Upon successful reconfiguration, the mobile terminal may receive the complete system information transmitted on the BCCH radio control channel.

Abstract

L'invention concerne un procédé et un dispositif permettant d'établir des liaisons entre des terminaux mobiles dans des réseaux de communication à largeurs de bande variables. Selon le procédé, des liaisons peuvent être établies de manière efficace entre des terminaux mobiles. Il est prévu d'utiliser un faisceau de sous-porteuses émises en permanence, des balises anglaises. Les balises anglaises présentent des positions déterminées antérieurement et par conséquent connues des terminaux mobiles, dans la bande de fréquence. Ces positions peuvent également être groupées localement par rapport aux cellules radio.
PCT/EP2006/062791 2005-06-17 2006-05-31 Procede pour etablir des liaisons entre des terminaux mobiles dans des reseaux de communication a largeurs de bande variables WO2006134032A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510028179 DE102005028179A1 (de) 2005-06-17 2005-06-17 Verfahren zum Verbindungsaufbau durch mobile Endgeräte in Kommunikationsnetzen mit variablen Bandbreiten
DE102005028179.6 2005-06-17

Publications (1)

Publication Number Publication Date
WO2006134032A1 true WO2006134032A1 (fr) 2006-12-21

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WO (1) WO2006134032A1 (fr)

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WO2007051182A1 (fr) * 2005-10-27 2007-05-03 Qualcomm Incorporated Methode et appareil pour un amorcage d'informations dans un systeme de communication
WO2009053816A2 (fr) * 2007-10-22 2009-04-30 Nokia Corporation Métadonnées de signalisation pour télédiffusion numérique
WO2009064531A2 (fr) * 2007-11-15 2009-05-22 Qualcomm Incorporated Canaux de contrôle à balises
WO2009099841A2 (fr) 2008-02-01 2009-08-13 Qualcomm Incorporated Procédé et appareil pour faciliter des codes concaténés pour des canaux de balise
US8045512B2 (en) 2005-10-27 2011-10-25 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US8098569B2 (en) 2000-09-13 2012-01-17 Qualcomm Incorporated Signaling method in an OFDM multiple access system
US8446892B2 (en) 2005-03-16 2013-05-21 Qualcomm Incorporated Channel structures for a quasi-orthogonal multiple-access communication system
US8462859B2 (en) 2005-06-01 2013-06-11 Qualcomm Incorporated Sphere decoding apparatus
US8477684B2 (en) 2005-10-27 2013-07-02 Qualcomm Incorporated Acknowledgement of control messages in a wireless communication system
US8565194B2 (en) 2005-10-27 2013-10-22 Qualcomm Incorporated Puncturing signaling channel for a wireless communication system
US8582548B2 (en) 2005-11-18 2013-11-12 Qualcomm Incorporated Frequency division multiple access schemes for wireless communication
US8582509B2 (en) 2005-10-27 2013-11-12 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US8599945B2 (en) 2005-06-16 2013-12-03 Qualcomm Incorporated Robust rank prediction for a MIMO system
US8611284B2 (en) 2005-05-31 2013-12-17 Qualcomm Incorporated Use of supplemental assignments to decrement resources
US8644292B2 (en) 2005-08-24 2014-02-04 Qualcomm Incorporated Varied transmission time intervals for wireless communication system
US8675537B2 (en) 2008-04-07 2014-03-18 Qualcomm Incorporated Method and apparatus for using MBSFN subframes to send unicast information
US8693405B2 (en) 2005-10-27 2014-04-08 Qualcomm Incorporated SDMA resource management
US8761032B2 (en) 2007-11-16 2014-06-24 Qualcomm Incorporated Random reuse based control channels
US8879511B2 (en) 2005-10-27 2014-11-04 Qualcomm Incorporated Assignment acknowledgement for a wireless communication system
US8885628B2 (en) 2005-08-08 2014-11-11 Qualcomm Incorporated Code division multiplexing in a single-carrier frequency division multiple access system
US8917654B2 (en) 2005-04-19 2014-12-23 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US9088384B2 (en) 2005-10-27 2015-07-21 Qualcomm Incorporated Pilot symbol transmission in wireless communication systems
US9107239B2 (en) 2008-04-07 2015-08-11 Qualcomm Incorporated Systems and methods to define control channels using reserved resource blocks
US9130810B2 (en) 2000-09-13 2015-09-08 Qualcomm Incorporated OFDM communications methods and apparatus
US9136974B2 (en) 2005-08-30 2015-09-15 Qualcomm Incorporated Precoding and SDMA support
US9137822B2 (en) 2004-07-21 2015-09-15 Qualcomm Incorporated Efficient signaling over access channel
US9143305B2 (en) 2005-03-17 2015-09-22 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9144060B2 (en) 2005-10-27 2015-09-22 Qualcomm Incorporated Resource allocation for shared signaling channels
US9148256B2 (en) 2004-07-21 2015-09-29 Qualcomm Incorporated Performance based rank prediction for MIMO design
US9154211B2 (en) 2005-03-11 2015-10-06 Qualcomm Incorporated Systems and methods for beamforming feedback in multi antenna communication systems
US9172453B2 (en) 2005-10-27 2015-10-27 Qualcomm Incorporated Method and apparatus for pre-coding frequency division duplexing system
US9179319B2 (en) 2005-06-16 2015-11-03 Qualcomm Incorporated Adaptive sectorization in cellular systems
US9184870B2 (en) 2005-04-01 2015-11-10 Qualcomm Incorporated Systems and methods for control channel signaling
US9209956B2 (en) 2005-08-22 2015-12-08 Qualcomm Incorporated Segment sensitive scheduling
US9225488B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Shared signaling channel
US9225416B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Varied signaling channels for a reverse link in a wireless communication system
US9246560B2 (en) 2005-03-10 2016-01-26 Qualcomm Incorporated Systems and methods for beamforming and rate control in a multi-input multi-output communication systems
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US9326253B2 (en) 2007-11-15 2016-04-26 Qualcomm Incorporated Wireless communication channel blanking
US9461859B2 (en) 2005-03-17 2016-10-04 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
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US10939416B2 (en) 2008-04-07 2021-03-02 Qualcomm Incorporated Systems and methods to define control channels using reserved resource blocks
US9107239B2 (en) 2008-04-07 2015-08-11 Qualcomm Incorporated Systems and methods to define control channels using reserved resource blocks

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