WO2004066651A1 - Procede et dispositif de recherche et selection de cellules - Google Patents

Procede et dispositif de recherche et selection de cellules Download PDF

Info

Publication number
WO2004066651A1
WO2004066651A1 PCT/CN2003/000063 CN0300063W WO2004066651A1 WO 2004066651 A1 WO2004066651 A1 WO 2004066651A1 CN 0300063 W CN0300063 W CN 0300063W WO 2004066651 A1 WO2004066651 A1 WO 2004066651A1
Authority
WO
WIPO (PCT)
Prior art keywords
channel
output
signal
energy
input
Prior art date
Application number
PCT/CN2003/000063
Other languages
English (en)
Chinese (zh)
Inventor
Chen Ji
Liwen Shi
Original Assignee
Linkair Communications, Inc.
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 Linkair Communications, Inc. filed Critical Linkair Communications, Inc.
Priority to CN03805478.7A priority Critical patent/CN1640165A/zh
Priority to PCT/CN2003/000063 priority patent/WO2004066651A1/fr
Priority to AU2003207222A priority patent/AU2003207222A1/en
Publication of WO2004066651A1 publication Critical patent/WO2004066651A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7083—Cell search, e.g. using a three-step approach
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/70735—Code identification
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H04J13/007—LAS, i.e. LA, LS and LAS codes

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a technology for performing a cell search and detecting a cell ID (Cell ID) when a mobile station in an idle mode (connected mode) and a connected mode (connected mode) in a CDMA system.
  • Cell ID cell ID
  • the purpose of cell search is to find all cells / sectors with sufficient signal strength, and establish downlink synchronization with the selected cell.
  • the business channels of different cells use different LS spreading code groups and different LA intervals. .
  • the mobile station In order for a mobile station to correctly demodulate the signal of a certain cell / sector and establish communication, it must obtain the information of the LS code group and LA interval arrangement of the cell / sector traffic channel. Therefore, in the cell search, the mobile station must search all possible cell ID sequences in the downlink synchronization physical channel, detect all cells / sectors with sufficient signal strength, and further obtain the target cell / sector usage. LS interval information.
  • An object of the present invention is to provide a cell search and selection method and device, which are used to search all possible cell ID sequences, detect all cells / sectors with sufficient signal strength, and obtain a target cell I Information about the LS code group and LA interval used by the sector.
  • a method for cell search and selection which is characterized by including the following steps:
  • the LS matching and filtering signals are respectively processed for LA polarity matching, squaring and LA energy combining, and the processed signals are subjected to energy distribution processing (power prof i le gen);
  • the LS matched filtering includes: If defined ⁇ - ⁇ ;
  • shock response function of LS matched filtering is:
  • the matched filtered output signal of LS is:
  • the output signal is:. 'For the complex number ⁇ + _ / ⁇ &, .
  • the process of performing LA polarity matching on the LS-matched and filtered signals, and combining the squared and LA energy refers to:
  • LA polarity matching and squaring can be performed on the LS matched filtered signals respectively; and squared and LA polarity matching can be performed on the LS matched filtered signals.
  • the LA polarity matching is a delay line with a length of 3 ⁇ 4 channel length of the downlink synchronization object. After LA multiplication, it is multiplied with the LA polarity sequence [, a 2 , ... a 8 ], and then the LS symbol is used.
  • Several adders are used to achieve LA polarity matching, where the number of LS symbols is the number of LS codes included in the downlink synchronization physical channel.
  • the LA energy combining is the squaring of the signal, through a delay line of the length of the downlink synchronization physical channel, and using an adder to achieve the energy combining of the LS symbols.
  • the energy distribution processing includes: if the input of ⁇ i LS matched filters (MF) after the square operation is greater than the input from K * LA combining, then the corresponding i-th output is the i-th LS matched filter (MF) Input after squaring operation, otherwise ⁇ i output is 0, where K is preset parameter.
  • the peak detection includes: Within each frame time, according to the initial frame boundary position obtained from the initial frame boundary detection, the search time window of the downlink synchronization physical channel is determined, and within the search time window, the peak signal strength (s k ) of the matched filter output and the corresponding Position x k
  • the determination of the search time window is as follows:
  • the oversampling rate of each chip of the baseband digital signal is Fs.
  • the search time window length is Nw chips
  • the LS code length is Nls chips. chip
  • the LA code length is Nla chips.
  • the energy profile processing (Power Profile Gen) unit outputs a total of Fs * Nc samples within a superframe time, and is recorded as PowerProfile [l .. Fs * Nc];
  • the number of corresponding peak positions is counted as C i;
  • Step 3 Move the sliding window to the right by one position and repeat the first step.
  • the channel selection will select one of all detected sectors as the active sector, and the mobile station will demodulate and multipath receive the signal of this sector; which sector the mobile station chooses as the active sector is
  • the upper layer decides that the physical layer simply reports the measurement results to the upper layer
  • the physical layer After receiving the indication of which sector in the upper layer is the active sector, the physical layer uses the corresponding Yc- (Nls + Nla) * Fs as the starting position of the downlink frame timing of the mobile station;
  • the mobile station will perform multipath search, RAKE reception, and timing tracking according to the starting position of the frame timing.
  • the invention also provides a device for cell search and selection, which includes: LS matched filter, LA polarity matching unit, square unit, LA energy combining unit, energy distribution processing unit, peak detector, channel detector, channel Selector;
  • the output signals of the LS matched filter are input to the LA polarity matching unit, the square unit and the LA energy combining unit, respectively; the output signal of the square unit and the output signal of the LA energy combining unit are input to the energy distribution processing unit;
  • the output signal of the energy distribution processing unit is input to the peak detector; the output signal of the peak detector is input to the channel detector;
  • the output signal of the channel detector is input to the channel selector; the output signal of the channel selector.
  • the LS matched filter includes:
  • the output signal of the matched filter of LS is:
  • the output signal is:
  • the output signals of the LS matched filter are input to the LA polarity matching unit, respectively.
  • the square unit and the LA energy combining unit include:
  • the output signal of the LS matched filter is input to each different LA polarity matching unit; the output signal of each different LA polarity matching unit is respectively input to each square unit;
  • the output signal of the LS matched filter is inputted into a square unit and a LA energy combining unit connected to the square unit.
  • the LA polarity matching unit includes: a delay line with a long downlink synchronization physical channel length, a tap multiplier, and an adder.
  • the LA energy combining unit includes: a delay line having a length of a downlink synchronization physical channel, and an adder.
  • the energy distribution processing unit includes: if the input of the i-th LS matched filter (MF) after the square operation is greater than the input from K * combining, then the corresponding i-th output is the i-th LS matched filter (MF) Input after squaring, otherwise the i-th output is 0, where K is the preset parameter.
  • the peak detector includes: determining, within each frame time, a search time window of a downlink synchronization physical channel according to an initial frame boundary position obtained by detecting an initial frame boundary, and finding a matched filter output within the search time window.
  • the peak signal strength ( Sk ) and the corresponding position Xk are compared to determine, within each frame time, a search time window of a downlink synchronization physical channel according to an initial frame boundary position obtained by detecting an initial frame boundary.
  • the channel detector includes:
  • the channel selector outputs signals to a multi-channel detector and a D-DPCH receiver.
  • the LA polarity matching unit may be composed of adders of LS symbols.
  • the LA energy combining unit may be composed of adders of LS symbols.
  • the beneficial effect of the present invention is that by providing a cell search and selection method and device for searching all possible cell ID sequences, detecting all cells / sectors with sufficient signal strength, we obtain Information about the LS code group and LA interval used by the destination cell / sector. Downlink synchronization with the selected cell is established.
  • FIG. 1 is a subframe structure diagram of a downlink synchronization channel
  • FIG. 2 is a block diagram of a cell searcher
  • Figure 3 is a structural block diagram of the LS matched filter
  • Figure 4 is a schematic diagram of a LA polarity matching unit
  • Figure 5 is a schematic diagram of LA energy combining.
  • the present invention provides a method and device for cell search and selection.
  • the process and algorithm of performing a cell search and detecting a cell ID (Cel l ID) when the mobile station is in idle mode and connected mode is described in detail below with reference to the accompanying drawings.
  • the structure of the downlink synchronization channel is shown in Figure 1.
  • the downlink synchronization physical channels of all cells use the same LS spreading code (see Table 1), and different modulation symbol code groups are used to distinguish the cells.
  • Each time slot transmits a downlink synchronization pulse with a length of 72 Chips.
  • the downlink synchronization pulse is transmitted at the beginning of each time slot.
  • the LS code used for the downlink synchronization channel is complex digital, and the corresponding spreading and decoding Spreading is similar to QPSK, as shown in Table 4.
  • the 8 slots of the downlink synchronization subframe can transmit 8 modulation symbols, and a total of 8 bipolar mutually orthogonal code sequences can be obtained, such as each row or column of an 8 x 8 Walsh matrix, in a TD-LAS quasi-commercial system
  • code sequences are called LA polar sequences (see Table 3).
  • 8 orthogonal LA polar sequences can support the networking of 8 cells / sectors. To support a larger network size, consider combining with other cell identification methods such as continuous pilot cell identification, or you can use Different cell / sector clusters use different LA guard intervals to expand the D-SYNPCH signal set. Table 1.
  • the purpose of cell search is to find all cells / sectors with sufficient signal strength, and select Cell establishes downlink synchronization.
  • the traffic channels of different cells use different LS spreading code groups and different LA intervals.
  • the mobile station In order for a mobile station to correctly demodulate the signal of a certain cell / sector and establish communication, it must obtain the information of the LS code group and LA interval arrangement of the cell / sector traffic channel. Therefore, in the cell search, the mobile station must search all possible cell ID sequences in the downlink synchronization physical channel, detect all cells / sectors with sufficient signal strength, and further obtain the target cell / sector usage. Information arranged in LS code group and LA interval.
  • the impulse response function of the LS matched filter is
  • the output signal is
  • the LA polarity matching unit is a delay line with a total length of 811Tc in the downlink synchronization physical channel. After LA multiplication, it is multiplied with the LA polarity sequence a 2 , ... a 8 ], and then 8 adders are used to Achieve U polarity matching. Its structure is shown in Figure 4:
  • the output of the LA matched filter after the square operation is the signal strength at each sampling point (here, the sampling rate is 1 / 4Tc).
  • the function of the LA energy combining unit is to combine the energy on each time slot of the downlink synchronization channel.
  • LA energy combining unit (LA Eng combining) is a delay line with a total length of 811Tc for the downlink synchronous physical channel, and uses eight adders to achieve the energy combining of the LS symbols. Its structure is shown in Figure 5.
  • K is the preset parameter.
  • a search time window of the downlink synchronization physical channel is determined, and the peak signal strength (S k ) of the matched filter output and the corresponding Position X k
  • the search time window is determined as follows:
  • Energy distribution Gen unit (Power Prof i le Gen unit) outputs a total of 4 * 30720 samples in a superframe time, recorded as PowerProf i le tl.. 30720 * 4]
  • FrameBoundaryLoc Record the initial frame boundary position obtained by the initial frame boundary detection as FrameBoundaryLoc, and determine the search time window as PowerProf i le [FraraeBoundaryLoc + 72 * 4 + 811 * 4-40 * 4.. FrameBoundaryLoc + 72 * 4 + 811 * 4 + 40 * 4]
  • Step 3 Move the sliding window to the right by one position and repeat the first step.
  • Xt is the peak energy position input of the current frame
  • St is the peak energy input for the current frame.
  • Yc is output for the start position of this superframe
  • Sc is the energy output of the downlink synchronous physical channel.
  • the channel selector will select one of the detected sectors as the active sector, and the mobile station will demodulate and multipath receive the signals in this sector. Which sector the mobile station chooses as the active sector is determined by the upper layer, and the physical layer simply reports the measurement result to the upper layer. After receiving the indication of which sector in the upper layer is the active sector, the physical layer
  • Yc-72 * 4- 811 * 4 is used as the starting position of the downlink frame timing of the mobile station.
  • the mobile station will perform multipath search, RAKE reception, and timing tracking functions according to the starting position of the frame timing.
  • Input signal output of baseband filter, signal rate 4fc;
  • Output signal the signal energy and frame start position ⁇ Yc, Sc ⁇ of all detected downlink downlink physical channels
  • the beneficial effect of the present invention is that by providing a cell search and selection method and device for searching all possible cell ID sequences, and detecting all cells / sectors with sufficient signal strength, we obtain Information about the LS code group and interval used by the destination cell / sector. Downlink synchronization with the selected cell is established.

Abstract

L'invention porte sur un procédé et un dispositif de recherche et sélection de cellules au moyen d'un filtre de signaux d'entrée à correspondance LS. La correspondance entre polarités LA est traitée après filtrage par le filtre à correspondance LS, puis on combine une élévation au carré et à la puissance LA, puis les signaux ainsi traités le sont ensuite par un générateur de profils de puissance, puis on détecte les pics puis les canaux, cette dernière consistant à détecter les signaux des canaux; la recherche et la sélection de cellules est alors terminée. Ceci permet de rechercher l'ensemble des séquences d'identification de cellules, de détecter des cellules à intensité de signaux suffisante, d'obtenir des informations sur des blocs de codage LS et sur les permutations d'intervalles LA employés par des cellules objets.
PCT/CN2003/000063 2003-01-23 2003-01-23 Procede et dispositif de recherche et selection de cellules WO2004066651A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN03805478.7A CN1640165A (zh) 2003-01-23 2003-01-23 一种小区搜索和选择的方法及装置
PCT/CN2003/000063 WO2004066651A1 (fr) 2003-01-23 2003-01-23 Procede et dispositif de recherche et selection de cellules
AU2003207222A AU2003207222A1 (en) 2003-01-23 2003-01-23 Method and device for searching and selecting cell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2003/000063 WO2004066651A1 (fr) 2003-01-23 2003-01-23 Procede et dispositif de recherche et selection de cellules

Publications (1)

Publication Number Publication Date
WO2004066651A1 true WO2004066651A1 (fr) 2004-08-05

Family

ID=32739360

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2003/000063 WO2004066651A1 (fr) 2003-01-23 2003-01-23 Procede et dispositif de recherche et selection de cellules

Country Status (3)

Country Link
CN (1) CN1640165A (fr)
AU (1) AU2003207222A1 (fr)
WO (1) WO2004066651A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1183014A (zh) * 1996-10-18 1998-05-27 松下电器产业株式会社 移动台
US6185423B1 (en) * 1999-05-28 2001-02-06 3Com Corporation Method and apparatus for selecting a communication channel in a communication network
WO2001095656A1 (fr) * 2000-06-05 2001-12-13 Linkair Communications, Inc. Procede d'affectation de ressources radio

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1183014A (zh) * 1996-10-18 1998-05-27 松下电器产业株式会社 移动台
US6185423B1 (en) * 1999-05-28 2001-02-06 3Com Corporation Method and apparatus for selecting a communication channel in a communication network
WO2001095656A1 (fr) * 2000-06-05 2001-12-13 Linkair Communications, Inc. Procede d'affectation de ressources radio

Also Published As

Publication number Publication date
CN1640165A (zh) 2005-07-13
AU2003207222A1 (en) 2004-08-13

Similar Documents

Publication Publication Date Title
KR100881169B1 (ko) 순방향 링크 프레임 생성 방법 및 장치, 그리고 셀 탐색 방법 및 장치
CN1135725C (zh) 在码分多址通信系统中用于搜索窗延迟跟踪的方法和设备
USRE42827E1 (en) Apparatus and method for synchronizing channels in a WCDMA communication system
JP5519286B2 (ja) Ｏｆｄｍセルラーシステムのためのｔｄｍベースのセルサーチ方法
US7027495B2 (en) Acquisition circuit for low chip rate option for mobile telecommunication system
US6760361B2 (en) Cell searching in a CDMA communications system
RU2248105C2 (ru) Система автономного контролирования поискового вызова
EP2680518B1 (fr) Procédé et appareil de corrélation croisée avec application à l'estimation de canal et de détection
JP2003037580A (ja) スペクトラム拡散通信システムにおける移動局の同期
SE520542C2 (sv) Förfarande och anordning för koherent kommunikation i ett spread-spectrum-system
ES2334328T3 (es) Estimador de canales y receptor de radio.
SE516144C2 (sv) Tidssynkronisering av en mottagare i ett digitalt radiotelefonsystem
WO2007010331A1 (fr) Detection de preambule
WO2004066531A1 (fr) Procede et dispositif de detection de limites de trames d'origine a partir d'un systeme srl-amrc
SE518787C2 (sv) Metod och mottagare för att demodulera en mottagen signal
JPH1098446A (ja) 基準整合濾波器を利用した並列捕捉システム
WO2004066651A1 (fr) Procede et dispositif de recherche et selection de cellules
CN103596260B (zh) 多载波gsm系统的时隙同步方法和系统
JPH0969800A (ja) スペクトラム拡散通信用ｃｓｋ通信装置及び通信方法
JP2001036432A (ja) Ｃｄｍａ伝送用の向上した性能を有する受信機と方法
CN101136687B (zh) 用于wcdma系统数字基带中的多径跟踪方法和装置
JP2003283371A (ja) 受信機の同期確立装置及びその方法
JPH11266475A (ja) 基地局コード識別方法及び移動局
CN1595856B (zh) 移动通信系统终端获取广播信息位置的方法及装置
KR100311528B1 (ko) 기지국 탐색 방법 및 그를 위한 수신 장치

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SC SD SE SG SK SL TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

WWE Wipo information: entry into national phase

Ref document number: 20038054787

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application
32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 69(1) EPC DATED 28-11-2005

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP