WO2004086780A1 - Procede de synchronisation initiale de liaisons ascendantes dans un systeme drt - Google Patents

Procede de synchronisation initiale de liaisons ascendantes dans un systeme drt Download PDF

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Publication number
WO2004086780A1
WO2004086780A1 PCT/CN2004/000018 CN2004000018W WO2004086780A1 WO 2004086780 A1 WO2004086780 A1 WO 2004086780A1 CN 2004000018 W CN2004000018 W CN 2004000018W WO 2004086780 A1 WO2004086780 A1 WO 2004086780A1
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WO
WIPO (PCT)
Prior art keywords
uplink synchronization
time period
user terminal
synchronization code
network side
Prior art date
Application number
PCT/CN2004/000018
Other languages
English (en)
Chinese (zh)
Inventor
Yuehua Chen
Lei Zhou
Hao Hu
Sha Ma
Original Assignee
Huawei Technologies 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
Priority claimed from CNB031213537A external-priority patent/CN100558019C/zh
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2004086780A1 publication Critical patent/WO2004086780A1/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
    • H04B1/7075—Synchronisation aspects with code phase acquisition

Definitions

  • the present invention relates to an uplink synchronization technology in a mobile communication system, and particularly to an initial uplink synchronization method in a time division duplex (TDD) system for high-speed data transmission.
  • TDD time division duplex
  • a time division synchronous code division multiple access (TD-SCDMA) system is based on the TDD mode, that is, uplink and downlink are in the same frequency band and do not need paired frequencies. Therefore, the spectrum utilization is high and the correlation between uplink and downlink resources is large.
  • TD-SCDMA time division synchronous code division multiple access
  • FDD frequency division duplex
  • the physical channel of the TD-SCDMA system is composed of radio frames. Each radio frame is divided into two consecutive subframes. Each subframe is composed of seven service time slots and three special time slots. The structure of the sub-frame is shown in Fig. 1. Among the seven service slots, the 0th slot is fixedly allocated to the downlink, the 1st slot is fixedly allocated to the uplink, and the remaining slots can be randomly allocated between the uplink and the downlink.
  • the three special time slots of the oblique line filling part are the downlink pilot time slot (DwPTS), the uplink pilot time slot (UpPTS), and the guard time slot (GP).
  • the DwPTS time slot is used to send a downlink synchronization code to complete the downlink synchronization;
  • the UpPTS time slot is used to send an uplink synchronization code to complete the initial uplink synchronization. Since there is only one downlink synchronization code used in each cell, it corresponds to eight different uplink synchronization codes, and the corresponding relationship is determined. Moreover, when the user is in an idle state, it is necessary to maintain downlink synchronization and listen to broadcast information, and randomly select one of the available uplink synchronization codes for initial uplink synchronization.
  • the initial uplink synchronization process in the TD-SCDMA system is as follows:
  • Step 201 The base station sends DwPTS to the user terminal. After the user terminal obtains the downlink synchronization code, it completes the downlink synchronization according to the downlink synchronization code.
  • Step 202 The user terminal obtains an available uplink synchronization code according to the correspondence between the uplink and downlink synchronization codes. Since one downlink synchronization code corresponds to multiple uplink synchronization codes, here, the user terminal is Select a usable uplink synchronization code in a random manner.
  • Steps 201 to 202 are processes for establishing downlink synchronization.
  • the downlink synchronization is before the uplink synchronization.
  • the user terminal When the user terminal is powered on, it must first establish downlink synchronization with the cell, and only after the downlink synchronization is established can the uplink synchronization be established.
  • Step 203 The user terminal sends an UpPTS to the base station.
  • Step 204 After the base station searches for and detects the UpPTS sent by the user terminal, it estimates the adjustment information of the uplink transmission time and transmit power corresponding to the user.
  • Step 205 The base station notifies the user terminal of transmission power and transmission time adjustment information through a fast physical access channel (FPACH).
  • FPACH fast physical access channel
  • Step 206 The user terminal adjusts the transmission power and transmission time after receiving the power and transmission time to be adjusted sent by the base station. The establishment of the initial uplink synchronization is complete.
  • the wireless communication system has evolved from a frequency division multiple access (FDMA) analog communication system to a third generation mobile communication system (3G), and the supported services have gradually evolved from pure voice services to current data and voice mixed services. Until high-speed data services.
  • FDMA frequency division multiple access
  • 3G third generation mobile communication system
  • the current TD-SCDMA system cannot support high-speed data services.
  • the difference between data transmission and voice transmission is that: when transmitting data, the requirements for real-time performance are reduced, but the requirements for data transmission quality are increased. Therefore, in order to ensure the quality of data transmission, more resources must be used to transmit data, and less information must be used to transmit control information.
  • a system supporting high-speed data transmission based on the TDD system is proposed in another patent application.
  • 128 subframes are used as a control cycle, in which the last eight subframes are dedicated Used for centralized transmission of control information.
  • an efficient encoding method is used to centrally transmit the control information of the system to reduce the occupation of transmission control resources. This can form an optimized high-speed data transmission system.
  • the present invention proposes an initial uplink synchronization method in a time division duplex system, so that in the case of centralized transmission of control information, a user establishes initial uplink synchronization.
  • An initial uplink synchronization method of a time division duplex system provided by the present invention is applied to a high-speed data transmission system.
  • the method sets a time period T1 and a time period T2 in each control cycle, and sets a time period T1 in the time period T2.
  • the method further includes:
  • Each user terminal obtains a downlink synchronization code sent by the network side, and establishes downlink synchronization with the network side;
  • step B According to the downlink synchronization code obtained in step A and the correspondence between the downlink synchronization code and the uplink synchronization code, all corresponding uplink synchronization codes are obtained.
  • the user terminal randomly selects an available uplink synchronization code from all the uplink synchronization codes. , Sending the selected uplink synchronization code to the network side within the time period T1;
  • the network side After receiving the uplink synchronization code sent by the user terminal, the network side estimates the adjustment parameters for the uplink synchronization of the corresponding user terminal according to the time and power of the received uplink synchronization code, and then estimates the estimated uplink synchronization of all user terminals.
  • the adjustment parameters are broadcast to all user terminals within the time period T2;
  • Each user terminal receives the uplink synchronization adjustment parameters sent by the network side in step C to determine whether any uplink synchronization adjustment parameters are sent to it. If not, the uplink synchronization request fails, and step B is performed, otherwise, Find out the uplink synchronization adjustment information sent by the network to itself, and then adjust its own uplink synchronization related parameters according to the uplink synchronization adjustment information.
  • the time period T2 is a period immediately after the time period T1.
  • the initial uplink synchronization code is transmitted to the network side with an initial transmission power designated by a higher layer.
  • the control period is a period of time greater than the frame length.
  • the uplink synchronization adjustment parameters described in step C include at least uplink synchronization adjustment time information and uplink transmission power adjustment information.
  • the user terminals corresponding to the uplink synchronization adjustment parameters contained in the broadcast information during the T2 time period are: all user terminals or some user terminals that send the uplink synchronization code during the T1 time period.
  • the method further includes: setting a power climbing factor in advance, and after the first uplink synchronization fails, the user needs to increase the transmission power by a power climbing factor each time when the subsequent uplink synchronization code is sent.
  • step B further Including:
  • the user terminal determines whether the number of times of sending the uplink synchronization code exceeds the maximum value. If it exceeds, the uplink synchronization request fails, and the uplink synchronization process ends. Otherwise, the user terminal resends the uplink synchronization code to the network side within the time period T1.
  • the user terminal resends the randomly selected uplink synchronization code to the network side each time.
  • the user terminal resends the uplink synchronization code to the network side at each randomly selected sending position within the time period T1.
  • the present invention is applicable to a wireless communication system that requires uplink synchronization.
  • the present invention implements a high-speed data transmission user terminal in a TDD system by collectively responding to a user terminal that initiates an uplink synchronization request in the control cycle Synchronize with the initial uplink on the network side.
  • This method can reduce the occupation of a large amount of downlink resources, and is simple and reliable.
  • the method collectively sends the public control information within the time period T2, improves the reception performance of the public control information, and enhances the error correction performance of the public control information.
  • Figure 1 shows the subframe structure of the TDD system
  • Figure 2 shows the uplink synchronization process of the TDD system
  • FIG. 3 shows where control information is sent in the optimized data transmission system
  • FIG. 4 is a method for achieving initial uplink synchronization according to the present invention.
  • FIG. 5 is a schematic flowchart of a specific embodiment for establishing initial uplink synchronization
  • FIG. 6 is a schematic diagram of a physical layer frame structure of a high-speed data transmission system.
  • the core content of the present invention is: In a high-speed data transmission TDD system, two time periods are set in one control cycle, which are time period T1 and time period T2. Sending the corresponding uplink synchronization code in the T1 time period; and the network side sends a response to the uplink synchronization request in the T2 time period.
  • the method for implementing uplink synchronization according to the present invention includes the following steps:
  • Step 401 The user terminal obtains a downlink synchronization code sent by the network side, establishes downlink synchronization with the network side, and the downlink synchronization code has a corresponding relationship with multiple uplink synchronization codes.
  • Step 402 Obtain an uplink synchronization code from the corresponding relationship according to the downlink synchronization code obtained in step 401.
  • each user terminal randomly selects an available uplink synchronization code and sends it to the network side. .
  • Step 403 After receiving the uplink synchronization code sent by the user terminal, the network side estimates the adjustment parameters for the uplink synchronization of the corresponding user terminal according to the arrival time and received power of the received uplink synchronization code, and adjusts all the estimated uplink synchronization adjustment parameters. Perform unified coding, and broadcast to all user terminals in a concentrated manner within time period T2.
  • Step 404 After each user terminal receives the uplink synchronization adjustment parameter from the network side in response to the user in step 403, it is determined whether there is an uplink synchronization adjustment parameter sent to itself in the response information. If not, the current uplink synchronization request fails, and execution is performed. Step 402; otherwise, find out the uplink synchronization adjustment information sent by the network to itself from the broadcast information, and then adjust its own uplink synchronization related parameters according to the uplink synchronization adjustment information.
  • a user with an initial uplink synchronization establishment request sends an uplink synchronization request, and the network side initiates a centralized response using multiple FPACH channels in a subsequent fixed time period T2 to initiate the control period.
  • Multiple users for uplink synchronization request may be a time period larger than the frame length, and the time period T2 is immediately after the time period T1.
  • the user physical layer needs to obtain the following information from a higher layer or according to a preset setting: the service level, the available uplink synchronization code, and the maximum number of transmissions of the uplink synchronization code.
  • the process of establishing initial uplink synchronization in this embodiment is as follows:
  • Step 501 The base station sends a DwPTS to the user terminal. After the user terminal obtains the downlink synchronization code, it completes the downlink synchronization according to the downlink synchronization code.
  • Step 502 The user terminal obtains an available uplink synchronization code according to the correspondence between the uplink and downlink synchronization codes, and then randomly selects one of the available uplink synchronization codes according to its own service level.
  • Step 503 The user terminal transmits the uplink synchronization code selected in step 502 to the base station with the initial transmission power within a specified time period T1.
  • Step 504 After receiving the uplink synchronization code sent by the user terminal, the base station estimates the uplink synchronization adjustment related parameters such as the deviation of the uplink transmission time and the adjustment information of the uplink transmission power according to the time and the received power of the uplink synchronization code. In the subsequent period T2, the uplink synchronization adjustment information is broadcast to all user terminals through FPACH.
  • the network side can respond to all users who initiated uplink synchronization during time period T1, or can be users who initiated uplink synchronization partially during time period T1.
  • Step 505 The user terminal finds its own uplink synchronization time adjustment information and power control information according to the signature, and uses the found time adjustment information and power control information to adjust the sending time and power of the next uplink synchronization request.
  • the uplink synchronization ends.
  • the system may further set a maximum value of the number of uplink synchronization requests initiated by the user terminal, which is used to limit the maximum number of consecutive uplink synchronization requests. Of course, the number of times the system initiates an uplink synchronization request cannot exceed this maximum.
  • the user initiates uplink synchronization request information in a certain fixed time period T1.
  • the network side will centralize all the uplink synchronization adjustment information in a subsequent fixed time period T2. Respond to each user.
  • the time period T1 In order to enable timely response of the uplink synchronization request information sent in the time period T1, it is better to set the time period T1 to four subframes before the time period T2.
  • the system can selectively Respond.

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

Abstract

L'invention porte sur un procédé de synchronisation initiale de liaisons ascendantes dans un système DRT à haut débit de transmission de données, établissant des segments temporels T1 et T2 pour chaque période de contrôle. Ledit procédé comporte les étapes suivantes: division d'une période de contrôle en deux segments temporels T1 et T2; envoi dans le segment T1 d'un code de synchronisation correspondant à tous les terminaux d'utilisateurs ayant formulé une demande d'établissement de synchronisation initiale des liaisons ascendantes; et envoi dans le segment T2 d'une réponse à ladite demande. On peut ainsi réaliser une synchronisation initiale des liaisons ascendantes entre les terminaux d'utilisateurs et le réseau
PCT/CN2004/000018 2003-03-26 2004-01-06 Procede de synchronisation initiale de liaisons ascendantes dans un systeme drt WO2004086780A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNB031213537A CN100558019C (zh) 2002-10-23 2003-03-26 一种时分双工系统的初始上行同步方法
CN03121353.7 2003-03-26

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Publication Number Publication Date
WO2004086780A1 true WO2004086780A1 (fr) 2004-10-07

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0665659A2 (fr) * 1994-01-31 1995-08-02 Matsushita Electric Industrial Co., Ltd. Système de communication mobile TDMA/CDMA
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
CN1270722A (zh) * 1997-08-08 2000-10-18 奇维尔电讯公司 同步无线接入协议方法和装置
WO2001017137A1 (fr) * 1999-08-27 2001-03-08 Siemens Information And Communication Networks S.P.A. Procede et systeme permettant la synchronisation d'unites mobiles avec une station emettrice-receptrice de base

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0665659A2 (fr) * 1994-01-31 1995-08-02 Matsushita Electric Industrial Co., Ltd. Système de communication mobile TDMA/CDMA
CN1270722A (zh) * 1997-08-08 2000-10-18 奇维尔电讯公司 同步无线接入协议方法和装置
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
WO2001017137A1 (fr) * 1999-08-27 2001-03-08 Siemens Information And Communication Networks S.P.A. Procede et systeme permettant la synchronisation d'unites mobiles avec une station emettrice-receptrice de base

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