WO2004066532A1 - Procede et dispositif de mise en oeuvre pour sous-systeme de synchronisation de liaison descendante - Google Patents

Procede et dispositif de mise en oeuvre pour sous-systeme de synchronisation de liaison descendante Download PDF

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Publication number
WO2004066532A1
WO2004066532A1 PCT/CN2003/000061 CN0300061W WO2004066532A1 WO 2004066532 A1 WO2004066532 A1 WO 2004066532A1 CN 0300061 W CN0300061 W CN 0300061W WO 2004066532 A1 WO2004066532 A1 WO 2004066532A1
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WIPO (PCT)
Prior art keywords
initial
cell
carrier frequency
frame boundary
tracking
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PCT/CN2003/000061
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English (en)
Chinese (zh)
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WO2004066532A8 (fr
Inventor
Li Fang
Chen Ji
Jingbo Liu
Yongsheng Zhang
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Linkair Communications,Inc.
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Application filed by Linkair Communications,Inc. filed Critical Linkair Communications,Inc.
Priority to PCT/CN2003/000061 priority Critical patent/WO2004066532A1/fr
Priority to CN03805483.3A priority patent/CN1640041A/zh
Priority to AU2003211659A priority patent/AU2003211659A1/en
Publication of WO2004066532A1 publication Critical patent/WO2004066532A1/fr
Publication of WO2004066532A8 publication Critical patent/WO2004066532A8/fr

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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
    • H04B1/70735—Code identification
    • 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
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • H04B1/7077—Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
    • 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
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70702—Intercell-related aspects

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a CDMA system, and in particular, to a method and an apparatus for implementing a downlink synchronization subsystem. Background technique
  • the frequency accuracy of a mobile station crystal oscillator is generally around a few ppm, and it operates in the 2GHz frequency band, and the carrier frequency deviation is generally between 1K ⁇ to 10K ⁇ .
  • LA polar sequences of different cells cannot be accurately identified, and despreading up to 874Tc cannot be used. Therefore, it is necessary to find an implementation method and device for implementing downlink synchronization acquisition and cell identification in the TD-LAS system. Furthermore, a method and device for implementing downlink synchronization acquisition and cell identification that are generally effective for a general CDMA system are obtained. Summary of the invention
  • An object of the present invention is to provide a method and a device for implementing a downlink synchronization subsystem, which are used to implement frequency acquisition in a CDMA system, and simultaneously realize downlink synchronization acquisition and cell identification, and provide multipath information for receiving a service channel, and Carrier frequency tracking is performed to ensure the accuracy of the timing frequency and has the characteristics of simplicity and practicality.
  • a method for implementing a downlink synchronization subsystem includes the following steps: detecting an initial frame boundary;
  • the detection of the initial frame boundary refers to: In the initial frame boundary detection, the relevant peaks are extracted through a filter that matches the physical channel downlink synchronization of all cells to implement frame boundary detection; because all cells use different bipolar LAs Polarity sequence, so the downlink synchronization matching filter can only perform matching filtering on time slots, and perform LA non-coherent combining on the entire downlink synchronization physical channel.
  • the initial frequency acquisition refers to: After the initial frame boundary detection is completed, the mobile station can obtain the starting timing positions of one or more downlink synchronization physical channels from different cells that may exist; The frame boundary information of a cell is strong, the carrier frequency deviation is obtained by using the downlink synchronization physical channel, and the VC0 of the radio frequency needs to be adjusted to complete the initial carrier frequency acquisition
  • the performing cell search and selection refers to: searching all cells / sectors with sufficient signal strength, and establishing downlink synchronization with the selected cell.
  • Multi-path searching and tracking refers to receiving signals received by a mobile station through multiple paths after receiving frame synchronization, code synchronization, and carrier synchronization and determining a target cell. Select the appropriate path and provide it to the RAKE receiver.
  • the carrier frequency tracking means that: the initial carrier frequency acquisition unit reduces the initial frequency difference to less than 500 Hz, and the cell identification unit obtains the LA + LS combination used by the cell; the mobile station uses the downlink continuous pilot channel for frequency tracking , Reduce the remaining frequency difference to less than 100Hz, to meet the needs of demodulation.
  • the described timing frequency tracking refers to:
  • the timing frequency tracking is detected by using a mobile station
  • the frame period is compared with the exact period to extract the clock error.
  • the mobile station After the mobile station is powered on, it first performs initial frame boundary detection. If no downlink synchronization physical channel can be detected, it will always perform frame boundary detection;
  • initial carrier frequency acquisition and cell search and selection are performed until the cell search and selection is successful. If the time for cell search and selection is greater than a certain parameter M, the initial frame boundary detection is performed again;
  • the polar sequence of the serving cell, the Cel ID, is obtained, and the LS + LA code group of the cell / sector is obtained;
  • the multipath search and tracking loop starts to work, and transmits the multipath information of the received signal to the upper layer.
  • the timing tracking loop, carrier tracking loop, and BCH channel reception can run and perform CRC check.
  • the invention also provides a device for implementing a downlink synchronization subsystem, which is characterized by comprising: an initial frame boundary detection device, an initial carrier frequency acquisition device, a cell search and selection device, a multipath search and tracking device, and a carrier frequency tracking device , Timing frequency tracking device;
  • An input signal enters the initial frame boundary detection device, and after detecting a downlink synchronization physical channel, the information of the initial frame boundary is sent to the initial carrier frequency acquisition device and the cell search and selection device;
  • the initial carrier frequency acquisition device and the cell search and selection device perform initial carrier acquisition and cell search selection by using information of an initial frame boundary and a received signal of a downlink synchronization channel, until the cell search and selection succeeds, the initial carrier frequency
  • the output signal of the capture device is the initial carrier frequency difference
  • the output signal of the cell search and selection device is the energy and arrival delay of each cell searched, and this information is reported to the upper layer;
  • the multipath search device and tracking device use the time of arrival of the frame and the received signal of the downlink synchronization channel to find multipath information for the timing frequency tracking device and the carrier frequency tracking device.
  • the initial frame boundary detection device includes: Input: the received signal (4 / c) after passing through the baseband filter;
  • the initial frequency acquisition device includes:
  • Input the downlink synchronization channel received signal (4 / c) passing the baseband filter, the position of the frame boundary;
  • the cell search and selection device includes:
  • Input the downlink synchronization channel received signal (4c) after passing through the baseband filter, the position of the frame boundary;
  • Output Frame boundary position and energy of each cell.
  • the multi-path signal searching and tracking device includes:
  • Input receive the signal (4) through the downlink synchronization channel of the baseband filter, the frame boundary position of the selected cell;
  • Multi-path search and tracking is performed after the mobile station obtains frame synchronization, code synchronization, and carrier synchronization, and determines the target cell, then selects an appropriate path among the received signals that reach the mobile station through multiple paths, and provides it to the RAKE receiver.
  • the carrier frequency tracking device includes:
  • Input The received signal (4 / c) of the downlink traffic channel through the baseband filter, the position of the two paths; Output: the carrier frequency deviation (-500Hz, 500Hz);
  • the initial carrier frequency acquisition unit reduces the initial frequency difference to less than 500Hz, and the cell identification unit obtains the LA + LS combination used by the cell; the mobile station uses the downlink continuous pilot channel for frequency tracking, and reduces the remaining frequency difference to less than 100Hz To meet the needs of demodulation.
  • the timing frequency tracking device includes:
  • Timing frequency deviation (-200Hz, 200Hz); Timing frequency tracking uses the frame period detected by the mobile station to compare with the accurate period to extract the clock error. .
  • the device according to the present invention further comprises: a baseband filter, a splitter, an RF VC0, a BB VCO, and a CRC check device;
  • the baseband received signal passes through the 4fc baseband filter and enters the initial frame boundary detection device.
  • the information of the initial frame boundary is sent to the initial carrier frequency acquisition device and A cell search and selection device, the initial carrier frequency acquisition device and the cell search and selection device use initial frame boundary information and a received signal of a downlink synchronization channel to perform initial carrier acquisition and cell search selection until the cell search and selection is successful.
  • the output signal of the initial carrier frequency acquisition device is an initial carrier frequency difference, which is used to adjust the VC0 of the radio frequency.
  • the output signal of the cell search and selection device is the energy and arrival delay of each cell that is searched.
  • the downlink multipath search and tracking device uses the frame arrival time and the received signal of the downlink synchronization channel to find multipath information for the timing frequency tracking device, the carrier frequency tracking device, and the reception and detection of the BCH channel.
  • Said CRC checking device said An output signal of the frequency tracking means for adjusting the timing of the baseband VC0; of the carrier frequency tracking apparatus using multi-path information and the downlink pilot signals received continuous pilot channel, to calculate the carrier frequency difference, for adjusting the radio frequency VC0.
  • a beneficial effect of the present invention is that, by providing a method and device for implementing a downlink synchronization subsystem, the method is used for frequency acquisition in a CDMA system, and simultaneously realizes downlink synchronization acquisition and cell identification, and provides multipath information for receiving a service channel.
  • the carrier frequency is tracked to ensure the accuracy of the timing frequency, and has the characteristics of simple and practical. among them:
  • Initial frame boundary detection A frame boundary of a cell may be detected
  • Initial frequency acquisition Use the result of the initial frame boundary detection to obtain the frame start position of the downlink synchronization physical channel, perform partial despreading of the LS code, use the FFT algorithm to implement frequency acquisition, and reduce the carrier frequency deviation from the KHz range to less than 500Hz;
  • Multi-path signal search and tracking After cell search and selection, the mobile station uses the downlink synchronization channel to search and track multi-path signals to provide multi-path information for the reception of traffic channels;
  • Carrier frequency tracking Since the reception of the service channel requires the deviation of the carrier frequency to be less than 100Hz, it is necessary to continuously track the carrier frequency. Using continuous pilot channels and using differential detection to track the carrier frequency is simple and practical;
  • Timing frequency trace VC0 used by the mobile station for baseband timing and sampling has an initial deviation from the VC0 of the base station. Large deviations are likely to cause slip codes and affect the reception quality of the service channel. Therefore, the frequency of VC0 needs to be constantly adjusted to ensure the timing frequency. Accurate.
  • FIG. 1 is a subframe structure diagram of a downlink synchronization channel
  • Figure 2 is a control flowchart of the downlink synchronization subsystem
  • Figure 3 is a structural block diagram of the downlink synchronization subsystem.
  • DETAILED DESCRIPTION The present invention provides a method and device for implementing a downlink synchronization subsystem, including algorithms such as initial frame boundary detection, initial carrier acquisition, cell search and selection, multipath signal search and tracking, carrier tracking, and timing tracking. Through simulation, the feasibility is verified, which provides a reference and basis for the synchronization implementation of the CDMA system.
  • the following uses the TD-LAS system as an example and in conjunction with the drawings to explain the specific implementation of the present invention in detail.
  • the downlink synchronization subsystem of the TD-LAS system needs to complete the following tasks:
  • the specific implementation of the present invention is mainly a set of solutions for the downlink synchronization subsystem designed for the physical layer specification of the TD-LAS system, including initial frame boundary detection, initial carrier acquisition, cell search and selection, multipath signal search and tracking. , Carrier tracking, timing frequency tracking, etc.
  • the downlink synchronization sub-frame has a total of 8 time slots, and the length of each time slot refers to Table 2.
  • Each time slot transmits a downlink synchronization pulse of 72 Chips in length, which includes the C code of 24 chips and the S code of 24 chips. A guard band of 24 chips is reserved in the middle.
  • 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 despreading is similar to QPSK, as shown in Table 4.
  • the 8 slots of the downlink synchronization subframe can transmit 8 modulation symbols.
  • a total of 8 bipolar mutually orthogonal code sequences can be obtained, such as each row or column of the 8 x 8 Wal sh matrix.
  • These code sequences are called LA polar sequences (see Table 3).
  • 8 orthogonal LA polar sequences can support 8-cell / sector networking; to support a larger network size, consider combining with other cell identification methods such as continuous pilot cell identification, or you can Make different cell / sector clusters use different LA guard intervals to expand the signal set of D-SYNPCH. Table 1.
  • LA slot (TS,) 0 1 2 3 4 5 6 7
  • the initial carrier frequency offset is less than 500Hz.
  • the LA polarity sequence of different cells can be accurately identified, and the downlink synchronization physical channel can be despread over the entire 874Tc. Therefore, the downlink synchronization physical channel matching each cell is used.
  • the filter can implement downlink synchronization acquisition and cell identification at the same time, and does not need to adjust the carrier frequency.
  • the frequency accuracy of a mobile station crystal oscillator is generally around a few ppm, working in the 2GHz band, and the carrier frequency deviation is generally between ⁇ to ⁇ . Under this condition, the LA polar sequences of different cells cannot be accurately identified, and despreading up to 874Tc cannot be used. Therefore, the initial carrier must be performed before the algorithm for downlink synchronization acquisition and cell identification is implemented in the TD-LAS system. Capture so that the frequency deviation is less than 500Hz.
  • the process of the downlink synchronization subsystem is as follows:
  • Multi-path signal search and tracking After the cell is searched and selected, the mobile station uses the downlink synchronization channel to search and track the multi-path signal to provide multi-path information for the reception of the service channel;
  • Carrier frequency tracking Because the reception of the service channel requires the deviation of the carrier frequency to be less than 100Hz, it is necessary to continuously track the carrier frequency.
  • the continuous pilot channel is used to track the carrier frequency by differential detection. It is simple and practical ;
  • Timing frequency tracking The VC0 used by the mobile station for baseband timing and sampling has an initial deviation from the VC0 of the base station. The large deviation easily generates slip codes and affects the reception quality of the service channel. Therefore, the frequency of VC0 needs to be constantly adjusted to ensure the timing. Accurate frequency.
  • the control of the downlink synchronization subsystem process is shown in Figure 2.
  • the mobile station first performs initial frame boundary detection after power-on. If no downlink synchronization physical channel can be detected, frame boundary detection will always be performed. After the frame boundary detection is completed, initial carrier frequency acquisition and cell search and selection are performed until the cell search and selection is successful. If the time for cell search and selection is greater than a certain parameter M, the initial frame boundary detection is performed again. After the initial carrier frequency acquisition and cell search and selection are successful, the LA polar sequence of the serving cell, the Cel ID, and the LS + LA code group of the cell / sector are obtained. After that, the multipath search and tracking loop began to work, and the multipath information of the received signal was transmitted to the upper layer. The timing tracking loop, the carrier tracking loop, and the BCH channel reception could be run, and a CRC check was performed.
  • the structure of the receiver of the downlink synchronization subsystem is shown in Figure 3.
  • the baseband received signal passes through the 4 / c baseband filter and enters the IFBD (Initial Frame Boundary Detection) unit.
  • the information of the initial frame boundary is sent to the initial carrier frequency acquisition unit and cell.
  • Search and selection unit, initial carrier frequency acquisition unit and cell search and selection unit use initial frame boundary information and received signals of the downlink synchronization channel to perform initial carrier acquisition and minimization.
  • the output signal of the initial carrier frequency capture unit is the initial carrier frequency difference, which is used to adjust the vco of the radio frequency
  • the output signal of the zone search and selection unit is the energy and arrival of each cell searched The delay is reported to the upper house.
  • the downlink multipath search and tracking unit uses the frame arrival time and the received signal of the downlink synchronization channel to find multipath information for the timing frequency tracking unit, the carrier frequency tracking unit, and the reception and CRC of the BCH channel.
  • the output signal of the checking unit and the timing frequency tracking unit is used to adjust the baseband timing VC0;
  • the carrier frequency tracking unit uses the multipath information and the received signal of the downlink continuous pilot channel to calculate the carrier frequency difference and is used to adjust the VC0 of the radio frequency;
  • downlink The description of each point in the receiver structure of the synchronization subsystem is shown in Table 5, and the input and output description of each module is shown in Table 6. Table 5. Explanation of points in the receiver structure of the downlink synchronization subsystem
  • Received signal (4 / C ) of the initial frame edge passing through the baseband filter The position detected by the initial frame boundary of the cell with the strongest energy searched, Range: (0,30720 * 4)
  • the initial carrier is received through the downlink synchronization channel of the baseband filter Signal carrier frequency deviation (_5KHz, 5KHz) capture (4c), position of frame boundary
  • the relevant peaks are extracted through a filter that matches the physical channel downlink synchronization of all cells to implement frame boundary detection. Because all cells use different LA polar sequences, the downlink synchronization matching filter can only perform matching filtering on time slots and perform LA non-coherent combining on the entire downlink synchronization physical channel.
  • the despreading length of the downlink synchronization physical channel on the time slot is 72Tc, and the corresponding 3dB performance loss point is 8KHz. Therefore, the maximum frequency deviation tolerated by this algorithm is [-8KHz, 8KHz].
  • the mobile station can obtain the starting timing positions of one or more downlink synchronization physical channels from different cells that may exist.
  • the mobile station selects the frame boundary information of a cell with the strongest energy, uses the FFT algorithm to calculate the carrier frequency deviation, and constantly adjusts the VC0 of the radio frequency to complete the initial carrier frequency acquisition. After this step is completed, the carrier frequency deviation will drop below 500Hz.
  • the signal despreading length used in the algorithm is 48Tc, and the multiplied signal is estimated, so the frequency deviation range that the algorithm can estimate is [-5KHz, 5KHz].
  • the purpose of cell search is to find all cells / sectors with sufficient signal strength and establish downlink synchronization with the selected cell.
  • the service 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 traffic channel of this cell / sector. 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 destination cell / sector use.
  • the algorithm uses matched filtering on the entire downlink synchronization channel 874chip. Therefore, the frequency deviation range required by the algorithm is [-500Hz, 500Hz].
  • the prerequisite for carrier frequency tracking is that timing synchronization has been established between the mobile station and the base station, and the initial downlink carrier acquisition has reduced the carrier frequency deviation from a maximum of 6KHz to less than 500Hz.
  • carrier frequency tracking algorithms including FFT, DMP-FED, DD (differential frequency Rate detection). Because downlink continuous pilot channels are used in the TD-LAS system, frequency tracking can be achieved by using downlink continuous pilot channels.
  • LA initial carrier frequency capturing unit by the initial frequency difference is reduced to less than 5 00Hz, cell-cell recognition unit used to obtain the present composition + LS.
  • the mobile station can use the downlink continuous pilot channel for frequency tracking, reduce the remaining frequency difference to less than 100Hz, and meet the demodulation requirements.
  • Multi-path search and tracking is performed after the mobile station obtains frame synchronization, code synchronization, and carrier synchronization, and determines the target cell, then selects an appropriate path among the received signals that reach the mobile station through multiple paths, and provides it to the RAKE receiver.
  • a transmitter sends signals to a receiver via different paths.
  • the signal of each path undergoes different random amplitude attenuation and phase rotation, and different time delays. After these signals reach the receiver, the complex signals cause fading due to the addition of the complex numbers.
  • the existence of signals on these paths is also random. It exists at some moments, disappears at some moments, some moments are stronger than other path signals, and some moments may have stronger path signals.
  • a RAKE receiver including multiple branches can be used to combat multipath fading.
  • the RAKE receiver uses a search unit to detect multiple paths with strong signals and assigns them to each branch.
  • Each branch is responsible for synchronizing with a path signal and demodulating the signal in it, and then combining the path information according to certain rules.
  • Timing frequency tracking uses the frame period detected by the mobile station to compare with the accurate period to extract the clock error.
  • the frame period of the downlink signal be T.
  • T 30720T C.
  • the clock frequency of the mobile station and the base station is the same, the frame period measured by the mobile station is also T.
  • the clock frequency difference between the mobile station and the base station is 4, the sampling rate will change and the measured frame period will also change.
  • the periodic change be l, then ⁇ , where f is the exact clock frequency. Therefore, through detection, l can be used to modify the sampling clock.
  • the multipath search unit uses a code matching filter to detect the position of the D-SYNCH channel corresponding to each path in the received signal sampling sequence. Since D-SYNCH is in every downstream The signal frame position is fixed. When there is no clock error, the detected position is also unchanged. Therefore, using the position change given by the multipath search unit, the clock change can be detected, and the clock frequency difference can be calculated.
  • the multipath search unit should always give the information of the path that arrives first, and assume that the corresponding ⁇ is the same path, otherwise errors will be introduced.
  • the clock frequency tracking unit must also perform multi-frame accumulation and smoothing on the calculated frequency difference to reduce the influence of the multipath position error.
  • a beneficial effect of the present invention is that, by providing a method and device for implementing a downlink synchronization subsystem, the method is used to implement frequency acquisition, and simultaneously realize downlink synchronization acquisition and cell identification, provide multipath information for receiving a service channel, and perform carrier
  • the frequency tracking ensures the accuracy of the timing frequency and has the characteristics of simple and practical.

Abstract

L'invention concerne un procédé et un dispositif de mise en oeuvre pour sous-système de synchronisation de liaison descendante, capable de déceler la limite d'une trame initiale. On peut ensuite acquérir la fréquence initiale en utilisant le résultat de cette détection. Il est également possible d'effectuer la recherche et la sélection de cellule, la recherche et la reconnaissance de signal multitrajet, la poursuite de fréquence porteuse et la poursuite de fréquence de synchronisation. Dans un système AMRC, l'acquisition de fréquence, l'acquisition de synchronisation de liaison descendante et l'identification de cellule, la fourniture d'information multitrajet concernant le canal de trafic, et le lancement de la poursuite de fréquence porteuse permettent d'assurer la précision de fréquence de synchronisation, avec simplicité et efficacité.
PCT/CN2003/000061 2003-01-23 2003-01-23 Procede et dispositif de mise en oeuvre pour sous-systeme de synchronisation de liaison descendante WO2004066532A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/CN2003/000061 WO2004066532A1 (fr) 2003-01-23 2003-01-23 Procede et dispositif de mise en oeuvre pour sous-systeme de synchronisation de liaison descendante
CN03805483.3A CN1640041A (zh) 2003-01-23 2003-01-23 一种下行链路同步子系统实现方法及装置
AU2003211659A AU2003211659A1 (en) 2003-01-23 2003-01-23 Implement method and apparatus for downlink synchronization subsystem

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PCT/CN2003/000061 WO2004066532A1 (fr) 2003-01-23 2003-01-23 Procede et dispositif de mise en oeuvre pour sous-systeme de synchronisation de liaison descendante

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WO2004066532A8 WO2004066532A8 (fr) 2004-09-30

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Citations (6)

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Publication number Priority date Publication date Assignee Title
CN1182990A (zh) * 1997-10-05 1998-05-27 北京信威通信技术有限公司 同步码分多址通信链路的建立和保持方法
US6005854A (en) * 1997-08-08 1999-12-21 Cwill Telecommunication, Inc. Synchronous wireless access protocol method and apparatus
CN1315808A (zh) * 2000-03-27 2001-10-03 信息产业部电信科学技术研究院 一种码分多址数字移动通信系统的小区初始搜索方法
WO2001095515A1 (fr) * 2000-06-05 2001-12-13 Linkair Communications, Inc. Procede de tramage et systeme hertzien synchrone associe
WO2002011317A1 (fr) * 2000-06-20 2002-02-07 Linkair Communications, Inc. Un procede de trames duplex a repartition dans le temps (drt) pour la couche physique d'un systeme sans fil
CN1344075A (zh) * 2000-09-19 2002-04-10 株式会社Ntt都科摩 用于移动通信系统中移动站的小区搜索方法和移动站

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6005854A (en) * 1997-08-08 1999-12-21 Cwill Telecommunication, Inc. Synchronous wireless access protocol method and apparatus
CN1182990A (zh) * 1997-10-05 1998-05-27 北京信威通信技术有限公司 同步码分多址通信链路的建立和保持方法
CN1315808A (zh) * 2000-03-27 2001-10-03 信息产业部电信科学技术研究院 一种码分多址数字移动通信系统的小区初始搜索方法
WO2001095515A1 (fr) * 2000-06-05 2001-12-13 Linkair Communications, Inc. Procede de tramage et systeme hertzien synchrone associe
WO2002011317A1 (fr) * 2000-06-20 2002-02-07 Linkair Communications, Inc. Un procede de trames duplex a repartition dans le temps (drt) pour la couche physique d'un systeme sans fil
CN1344075A (zh) * 2000-09-19 2002-04-10 株式会社Ntt都科摩 用于移动通信系统中移动站的小区搜索方法和移动站

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AU2003211659A1 (en) 2004-08-13
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