WO2007023532A1 - Système à bande passante dimensionnable, appareil station de base radio, méthode de transmission par canal synchrone et méthode de transmission - Google Patents

Système à bande passante dimensionnable, appareil station de base radio, méthode de transmission par canal synchrone et méthode de transmission Download PDF

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Publication number
WO2007023532A1
WO2007023532A1 PCT/JP2005/015296 JP2005015296W WO2007023532A1 WO 2007023532 A1 WO2007023532 A1 WO 2007023532A1 JP 2005015296 W JP2005015296 W JP 2005015296W WO 2007023532 A1 WO2007023532 A1 WO 2007023532A1
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WO
WIPO (PCT)
Prior art keywords
bandwidth
base station
maximum
bandwidths
scalable
Prior art date
Application number
PCT/JP2005/015296
Other languages
English (en)
Japanese (ja)
Inventor
Hiroki Haga
Hidenori Matsuo
Katsuyoshi Naka
Original Assignee
Matsushita Electric Industrial Co., Ltd.
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 Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to PCT/JP2005/015296 priority Critical patent/WO2007023532A1/fr
Priority to PCT/JP2005/020311 priority patent/WO2007023578A1/fr
Priority to PCT/JP2006/316412 priority patent/WO2007023810A1/fr
Priority to JP2007532126A priority patent/JPWO2007023810A1/ja
Publication of WO2007023532A1 publication Critical patent/WO2007023532A1/fr

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Classifications

    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • 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
    • H04L27/2613—Structure of the reference signals
    • 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
    • H04L27/2613—Structure of the reference signals
    • H04L27/26132—Structure of the reference signals using repetition
    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • the present invention enables a radio base station apparatus to support a plurality of maximum bandwidths, and among the maximum bandwidths, it is possible to flexibly allocate a bandwidth in which each wireless terminal apparatus actually performs communication.
  • the present invention relates to a scalable bandwidth system, a radio base station apparatus used in the scalable bandwidth system, a synchronization channel transmission method, and a transmission method.
  • a radio base station apparatus (hereinafter simply referred to as a base station) supports a plurality of maximum bandwidths.
  • a wireless communication system has been proposed in which each wireless terminal device (hereinafter simply referred to as a terminal) can flexibly allocate a bandwidth for actual communication within the maximum bandwidth.
  • Such a wireless communication system is called a scalable bandwidth system (see Non-Patent Document 1, for example).
  • SCH Synchronization Channel
  • the terminal first detects symbol timing (FFT window timing) as the first stage, and then detects the frame timing using the SCH as the second stage. Specifically, the received signal is FFTed to separate the SCH and correlate with the SCH replica. The timing at which the largest correlation value among the obtained correlation values is obtained is detected as the frame timing. That Later, as a third step, a scramble code is identified using a pilot channel or the like.
  • FFT window timing symbol timing
  • the received signal is FFTed to separate the SCH and correlate with the SCH replica.
  • the timing at which the largest correlation value among the obtained correlation values is obtained is detected as the frame timing. That Later, as a third step, a scramble code is identified using a pilot channel or the like.
  • Non-Patent Document 3 proposes a method in which two SCHs are arranged in a frequency direction in lOFDM symbols as shown in FIG.
  • lOFDM symbols are arranged in one frame
  • Primary SCH (P—SCH) is a pattern common to all cells
  • S econdary SCH (S—SCH) is a different pattern (pattern representing a code group) for each cell. It is.
  • Non-Patent Document 1 3GPP TR 25.913 v7.0.0 (2005-06) "Requirements for Evolved UTRA and UTRAN"
  • Non-Patent Document 2 Hanada, Shin, Higuchi, Sawahashi (NTT DoCoMo), RCS2001-091 (2001-07) "Three-stage cell search characteristics using frequency-multiplexed synchronization channels in broadband multicarrier CDMA transmission
  • Non-Patent Document 3 3GPP Rl-050590, NTT DoCoMo "Physical Channels and Multiplexing in Evolved UTRA Downlink” (June 2005)
  • the bandwidth that should be supported by the scalable bandwidth system of Non-Patent Document 1 is specified as 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz.
  • the terminal Since the terminal does not know which bandwidth the base station is serving at the time of initial cell search, it has no power to start the initial cell search attempt at which center frequency and bandwidth within a maximum of 20 MHz. . Therefore, the terminal needs to start the initial cell search process after detecting the total service bandwidth of the base station.
  • Figure 2 shows the fixed bandwidth allocated to the terminal. This shows how correlation is acquired in a fixed (5 MHz) multi-carrier communication system. Since the bandwidth is fixed, correlation values can be easily acquired using a SCH replica signal with a period corresponding to this bandwidth.
  • FIG. 3 shows a state of correlation acquisition in a scalable bandwidth system in which the bandwidth allocated to the terminal is variable.
  • the terminal transmits the base station to each terminal during cell search. Since it is impossible to know the breakdown of the service bandwidth being used, the position and size of the SCH pattern are not known (that is, what SCH replica can be used! It becomes difficult.
  • An object of the present invention is to provide a scalable bandwidth system, a radio base station apparatus, and a radio base station apparatus that can correctly acquire a correlation value of a synchronization channel (SCH) without knowing a breakdown of services within the entire bandwidth.
  • a synchronization channel transmission method and a transmission method are provided.
  • the scalable bandwidth system of the present invention is configured such that a wireless base station device supports a plurality of maximum bandwidths, and each wireless terminal device actually communicates within the maximum bandwidth.
  • a scalable bandwidth system that allows flexible allocation of bandwidth to be performed, and repeatedly transmits a synchronization channel over the entire bandwidth of the maximum bandwidth in units of the minimum bandwidth of a plurality of serviced bandwidths.
  • the correlation between the radio base station apparatus to be held, the synchronization channel sequence signal of the minimum bandwidth unit held in advance, and the synchronization channel repeatedly transmitted is calculated, and the timing at which the maximum correlation value is obtained is determined by frame timing.
  • a wireless terminal device that detects the ming.
  • the terminal can correctly acquire the SCH correlation value without knowing the breakdown of services within the entire bandwidth of the base station.
  • FIG. 1 is a diagram showing a configuration example of a synchronization channel
  • FIG. 2 Diagram showing how correlation is acquired in a multi-carrier communication system where the bandwidth allocated to a terminal is fixed
  • FIG. 3 Diagram showing how correlation is acquired in a scalable bandwidth system with variable bandwidth allocated to terminals.
  • FIG. 4 is a block diagram showing the configuration of the base station according to the embodiment
  • FIG. 5 is a block diagram showing the configuration of the terminal according to the embodiment
  • FIG. 6 is a diagram for explaining the operation of the embodiment.
  • FIG. 7 is a diagram for explaining a transmission method of a base station according to another embodiment.
  • FIG. 4 shows a configuration of a radio base station apparatus (hereinafter referred to as a base station) used in the scalable bandwidth system of the present embodiment
  • FIG. 5 shows a radio terminal that communicates with base station 100.
  • the configuration of the device hereinafter referred to as a terminal.
  • Base station 100 flexibly allocates a bandwidth that is equal to or smaller than the maximum supported bandwidth to each terminal as a communication bandwidth of each terminal, OFDM communication is performed with each terminal.
  • Base station 100 inputs transmission data l to n addressed to terminals l to n to transmission control section 101.
  • the transmission control unit 101 selectively outputs the input transmission data 1 to n to the error correction code key unit 102.
  • Error correction code unit 102 performs error correction encoding processing on the data input from transmission control unit 101, and sends the encoded data obtained thereby to modulation unit 103.
  • the modulation unit 103 performs modulation processing such as QPSK (Quadrature Phase Shift Keying) and 16QAM (Quadrature Amplitude Modulation) on the encoded data, and the modulation signal obtained thereby is sent to the frame formation unit 104. Send it out.
  • QPSK Quadrature Phase Shift Keying
  • 16QAM Quadrature Amplitude Modulation
  • Frame forming section 104 forms a transmission frame signal by adding a pilot signal (PL) to the modulated signal, and sends it to scrambling section 105.
  • Scrambling section 105 performs scrambling processing using a cell-specific scrambling code, and sends the scrambled signal to subcarrier allocation section 106.
  • the subcarrier allocation unit 106 receives the synchronization channel sequence signal formed by the synchronization channel sequence signal formation unit 107 in addition to the transmission data from the scrambling processing unit 105.
  • the subcarrier allocation unit 106 is configured so that the synchronization channel sequence signal is repeatedly allocated in the minimum bandwidth unit among the multiple bandwidths supported by the base station over the entire bandwidth of the maximum bandwidth. Subcarrier allocation of synchronization channel sequence signals is performed.
  • subcarrier allocation section 106 arranges the signal after scrambling processing addressed to each terminal in the subcarrier of the position and bandwidth based on scheduling information and the like.
  • the subcarrier allocation unit 106 includes a serial / parallel conversion circuit.
  • subcarrier allocation section 106 is processed by fast inverse Fourier transform section (IFFT) 108, a guard interval is inserted by subsequent guard interval (GI) insertion section 109, and digital / analog conversion is performed by radio transmission section 110. After being subjected to predetermined radio processing such as processing and up-conversion processing to radio frequency, it is output from the antenna 111.
  • IFFT fast inverse Fourier transform section
  • GI guard interval
  • Terminal 200 inputs a signal received by antenna 201 to radio reception section 202.
  • Radio receiving section 202 obtains a baseband OFDM signal by performing predetermined radio processing such as down-conversion processing or analog-digital conversion processing on the received signal.
  • the baseband OFDM signal output from radio reception section 202 is input to fast Fourier transform section (FFT) 206 after the guard interval (GI) removal section 205 removes the guard interval.
  • FFT fast Fourier transform section
  • GI guard interval
  • the baseband OFDM signal is input to the bandwidth determination unit 203.
  • the bandwidth determination unit 203 for the OFDM signal obtained in each band, for example, the correlation value between the guard interval source part and the guard interval part in the signal obtained by shifting the OFDM signal by the effective symbol length And the maximum bandwidth supported by the base station 100 is determined based on the magnitude of this correlation value.
  • the symbol timing detection unit 204 detects the symbol timing by detecting the peak of the correlation value obtained by the bandwidth determination unit 203, for example.
  • FFT206 performs IFFT processing by performing FFT processing at the symbol timing (FFT window timing) detected by the symbol timing detection unit 204.
  • the previous signal is obtained and sent to subcarrier selection sections 207 and 209.
  • the subcarrier selection unit 207 sends, for example, a signal of the subcarrier indicated by the scheduling information sent on the control channel to the descrambling processing unit 208.
  • Subcarrier selection section 209 selects a subcarrier signal in a minimum bandwidth unit from among a plurality of bandwidths supported by the base station, and calculates SCH correlation value calculation section 210 and pilot correlation value calculation. Send to part 212.
  • SCH correlation value calculation section 210 calculates a correlation value between the synchronization channel signal output from subcarrier selection section 209 and a replica of the synchronization channel sequence signal in the minimum bandwidth unit, Timing The data is sent to the Z code group detection unit 211.
  • the Z code group detection unit 211 detects the frame timing and the code group by detecting the peak of the correlation value.
  • the nolot correlation calculation unit 212 calculates a correlation value between the signal output from the FFT 206 and a plurality of candidate scramble codes at the start timing of the frame (that is, the scrambling process arranged at the start of the frame is performed).
  • the correlation value between the pilot and a plurality of candidate scramble codes is calculated), and the correlation value is sent to the scramble code identifying unit 213.
  • the scramble code identifying unit 213 identifies the scramble code having the largest correlation value as the scramble code used in the base station 100, and sends the identified scramble code to the descrambling processing unit 208.
  • the descrambling processing unit 208 descrambles the signal output from the subcarrier selection unit 207 with the identified scramble code.
  • the descrambled signal is demodulated by the demodulator 214 and decoded by the decoder 215 to be received data.
  • base station 100 generates an SCH OFDM symbol from a symbol sequence common to all base stations, time-multiplexes the frame data, and inserts it into the frame after the scrambling process To do.
  • the symbol sequence pattern of the SCH is the minimum bandwidth of the scalable bandwidth (example: For example, it has a size equivalent to the number of subcarriers (1.25 MHz).
  • Subcarrier allocation section 106 repeatedly arranges the SCH having the minimum bandwidth size.
  • the SCH arrangement method will be specifically described with reference to FIG.
  • the maximum bandwidth that the base station 100 can transmit is assumed to be 5 MHz, and it is assumed that data signals are transmitted in three parts: 1.25 MHz, 2.5 MHz, and 1.25 MHz.
  • the number of subcarriers corresponding to the minimum bandwidth (1.25 MHz) of the scalable bandwidth is assumed to be 8.
  • the base station 100 repeatedly arranges SCH patterns having a size equivalent to the width of 1.25 MHz regardless of the service breakdown width.
  • the terminal 200 Upon receiving such a signal, the terminal 200 performs the following processing. If the upper limit of the frequency bandwidth (capability) that can be received by terminal 200 is larger than the minimum bandwidth (1.25 MHz) (2.5 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz), SCH correlation value calculation section 210 of terminal 200 Synthesizes SCH correlation values as shown in FIG. That is, the SCH correlation value calculation unit 210 synthesizes the correlation values obtained for each minimum bandwidth, and detects the timing at which the maximum value is obtained from the combined correlation values as a frame. This can improve the accuracy of frame timing detection.
  • the SCH correlation value calculation unit 210 selects a synchronization channel transmitted with one or a plurality of minimum bandwidths from among the synchronization channels repeatedly transmitted over the entire maximum bandwidth. Correlation can also be performed. In this way, it is not necessary to perform correlation processing with all the minimum bandwidths, and the amount of cell search processing can be reduced.
  • the minimum bandwidth unit for example, 1.25 MHz unit
  • the maximum bandwidth for example, 5 MHz
  • the maximum correlation value is calculated by calculating the correlation between the base station 100 that repeatedly transmits the synchronization channel over the entire band, the synchronization channel sequence signal of the minimum bandwidth unit that is held in advance, and the synchronization channel that is repeatedly transmitted.
  • the case where the synchronization channel is repeatedly transmitted has been described.
  • the minimum bandwidth of the multiple bandwidths served by the base station is shown.
  • the common control channel may be repeatedly transmitted in the width unit over the entire bandwidth of the maximum bandwidth. In this way, the terminal can know the common control information sent on the common control channel without knowing the breakdown of the service within the entire bandwidth of the base station, so that the SCH correlation process can be performed. become able to.
  • the scalable bandwidth system, radio base station apparatus, synchronization channel transmission method, and transmission method according to the present invention execute synchronization channel (SCH) correlation processing even if the terminal does not know the breakdown of services within the entire bandwidth. Therefore, it can be widely applied to scalable bandwidth systems, wireless base station devices, and wireless terminal devices.
  • SCH synchronization channel

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

Abstract

L’invention concerne un terminal pouvant réaliser un traitement de corrélation de canaux synchrones (SCH) même dans le cas où il ignore qu’une interruption des services dans toutes les bandes s’est produite. Une station de base transmet de façon répétitive un canal synchrone par unités de largeur de bande la plus faible (par exemple, 1,25 MHz) d’une pluralité de bandes passantes servie par le système et sur la totalité de la bande passante selon la bande la plus large (par exemple, 5 MHz). Le terminal calcule la corrélation entre un signal de séquence de canal synchrone de l’unité de largeur de bande la plus faible préparée à l’avance et le canal synchrone transmis de façon répétitive, et détermine, en tant que synchronisation de trame, un instant auquel la valeur maximale de corrélation est obtenue.
PCT/JP2005/015296 2005-08-23 2005-08-23 Système à bande passante dimensionnable, appareil station de base radio, méthode de transmission par canal synchrone et méthode de transmission WO2007023532A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/JP2005/015296 WO2007023532A1 (fr) 2005-08-23 2005-08-23 Système à bande passante dimensionnable, appareil station de base radio, méthode de transmission par canal synchrone et méthode de transmission
PCT/JP2005/020311 WO2007023578A1 (fr) 2005-08-23 2005-11-04 Systeme de bandes passantes extensibles, appareil de station radio de base, procede d'emission de canal synchrone et procede d'emission
PCT/JP2006/316412 WO2007023810A1 (fr) 2005-08-23 2006-08-22 Système de bande passante évolutive, appareil de station de base radio, procédés de transmission de canal synchrone et de transmission
JP2007532126A JPWO2007023810A1 (ja) 2005-08-23 2006-08-22 スケーラブル帯域幅システム、無線基地局装置、同期チャネル送信方法及び送信方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2005/015296 WO2007023532A1 (fr) 2005-08-23 2005-08-23 Système à bande passante dimensionnable, appareil station de base radio, méthode de transmission par canal synchrone et méthode de transmission

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WO2007023532A1 true WO2007023532A1 (fr) 2007-03-01

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PCT/JP2005/015296 WO2007023532A1 (fr) 2005-08-23 2005-08-23 Système à bande passante dimensionnable, appareil station de base radio, méthode de transmission par canal synchrone et méthode de transmission
PCT/JP2005/020311 WO2007023578A1 (fr) 2005-08-23 2005-11-04 Systeme de bandes passantes extensibles, appareil de station radio de base, procede d'emission de canal synchrone et procede d'emission

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PCT/JP2005/020311 WO2007023578A1 (fr) 2005-08-23 2005-11-04 Systeme de bandes passantes extensibles, appareil de station radio de base, procede d'emission de canal synchrone et procede d'emission

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4913504B2 (ja) 2006-05-01 2012-04-11 株式会社エヌ・ティ・ティ・ドコモ 基地局及び同期チャネル生成方法
JP2008236383A (ja) * 2007-03-20 2008-10-02 Toshiba Corp 無線通信システム

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004207983A (ja) * 2002-12-25 2004-07-22 Japan Telecom Co Ltd 移動端末および移動体通信システム

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004207983A (ja) * 2002-12-25 2004-07-22 Japan Telecom Co Ltd 移動端末および移動体通信システム

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"NTT DoCoMo, Physical Channel Concept for Scalable Bandwidth in Evolved UTRA Downlink", 3GPP TSG RAN WG1 AD HOC R1-050592, 21 June 2005 (2005-06-21), pages 1 - 14, XP002991785 *
"NTT DoCoMo, Physical Channel Structures for Evolved UTRA", 3GPP TSG RAN WG1 MEETING 41 R1-050464, 13 May 2005 (2005-05-13), pages 1 - 13, XP002991788 *
3GPP, 3GPP TR25.913 V7.0.0, June 2005 (2005-06-01), pages 1 - 15, XP002991786 *

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