WO2001043307A2 - Procede de maintien d'une transmission de signaux synchronisee dans le sens ascendant dans un systeme de radiocommunication - Google Patents

Procede de maintien d'une transmission de signaux synchronisee dans le sens ascendant dans un systeme de radiocommunication Download PDF

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Publication number
WO2001043307A2
WO2001043307A2 PCT/DE2000/004363 DE0004363W WO0143307A2 WO 2001043307 A2 WO2001043307 A2 WO 2001043307A2 DE 0004363 W DE0004363 W DE 0004363W WO 0143307 A2 WO0143307 A2 WO 0143307A2
Authority
WO
WIPO (PCT)
Prior art keywords
transmission
signals
base station
subscriber station
communication system
Prior art date
Application number
PCT/DE2000/004363
Other languages
German (de)
English (en)
Other versions
WO2001043307A3 (fr
Inventor
Lei Xiao
Stefan Bahrenburg
Michael Benz
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to AU30001/01A priority Critical patent/AU3000101A/en
Publication of WO2001043307A2 publication Critical patent/WO2001043307A2/fr
Publication of WO2001043307A3 publication Critical patent/WO2001043307A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/005—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by adjustment in the receiver

Definitions

  • the invention relates to a method for maintaining a synchronized signal transmission in the upward direction from at least one subscriber station to a base station of a radio communication system.
  • the invention is particularly suitable for use in a mobile radio system.
  • radio communication systems for example the second generation European mobile radio system GSM (Global System for Mobile Communications)
  • information for example voice, image information or other data
  • the radio interface relates to a connection between a base station and subscriber stations, wherein the subscriber stations can be, for example, mobile stations or fixed radio stations.
  • the electromagnetic waves are emitted at carrier frequencies that lie in a frequency band provided for the respective system.
  • UMTS Universal Mobile Telecommunication System
  • future radio communication systems for example the UMTS (Universal Mobile Telecommunication System) or other 3rd generation systems, frequencies in the frequency band of approx. 2000 MHz are planned.
  • Two modes are provided for the third mobile radio generation, one mode denoting FDD operation (frequency division duplex) and the other mode denoting TDD operation (time division duplex). These modes are used in different frequency bands. Both modes support a so-called CDMA subscriber separation procedure (Code Division Multiple Access).
  • CDMA subscriber separation procedure Code Division Multiple Access
  • a proposal for a third generation mobile radio system according to “TD-SCDMA Radio Transmission Technology for IMT-2000 *, Draft VO4, the CATT from September 1998 is based on the described TDD mode with the support of a CDMA subscriber separation method.
  • transmission blocks transmitted by several subscriber stations in a time slot which generally consist of a data part and a known training sequence, can be processed in parallel by a base station.
  • the respective time base of the subscriber stations is synchronized according to the prior art, as is already known, for example, from the GSM mobile radio system, and therefore generally in a connection establishment procedure in which the base station receives the time reference after receiving a signal from a subscriber station sets the respective subscriber station by signaling a correction value. Since the time reference can change continuously, for example due to a movement of the subscriber station, the time reference of the subscriber station must be periodically corrected in order to maintain temporal synchronicity. For this purpose, it is proposed for the third generation mobile radio systems to send special synchronization information with a certain periodicity ,
  • the Base station determines an arrival time of the signals sent by the subscriber station in the upward direction and signals corresponding synchronization control information in a subsequent corresponding traffic channel in the downward direction to the subscriber station.
  • the subscriber station evaluates the synchronization information and accordingly regulates the point in time for the subsequent transmission of the signals in the upward direction to the base station.
  • the so-called multipath transmission also has a major influence on the synchronization of the transmission in the upward direction.
  • the multipath transmission is due to a multipath propagation of the emitted signals, these reaching the receiving subscriber station on different paths and with different transit times due to reflections on objects.
  • a synchronized reception of the signals of the subscriber stations can only be implemented in the base station for the strongest transmission path in each case (for example the path with the greatest reception strength), during which the respective further transmission paths are received unsynchronized.
  • multipath profile is also time-variable, which means that the strongest transmission path can vary.
  • the time interval between two transmission paths can possibly be longer than a chip duration, but a control step should be shorter than the chip duration in order to be able to regulate the synchronization with sufficient accuracy. If the base station notices that the strongest transmission path of a subscriber station has changed, a signaling, possibly over several transmission frames, is required to regulate the time of transmission of the subscriber station. In this case, for example, the case may arise that the multipath profile changes further during the signaling, the readjustment no longer takes place sufficiently quickly and, if appropriate, the synchronization is completely lost.
  • the object of the invention is to provide a method and a subscriber station which enable simple maintenance of a synchronized signal transmission in the upward direction. This object is achieved by the method having the features of claim 1 and by the subscriber station of claim 5. Advantageous further developments of the invention can be found in the dependent patent claims.
  • the subscriber station uses the existing reciprocity between the properties of the transmission channels in the upward and downward direction, since the channels are transmitted in a common frequency band at different times.
  • Properties determined by the subscriber station can be, for example, characteristic values such as the bit error rate or, according to the invention, a time variation.
  • the subscriber station thus uses the base station when determining a temporal change in the received signal. Station this information to control the timing of the transmission of signals in the upward direction.
  • the method according to the invention advantageously makes it possible to react more quickly to changes in time, since no signaling from the base station is required to control the time of transmission. Furthermore, the control is more precise, can react more flexibly to changes and can be implemented very inexpensively due to the use of functions that are largely already available in the subscriber station.
  • a further advantage lies in the case where a closed control loop is used in accordance with a development of the invention, in a significantly lower signaling load, since when using a closed control loop, synchronization control information is only signaled in the event of incorrect synchronization he follows. As long as the “open control loop *” of the subscriber station leads to sufficient synchronization according to the method according to the invention, additional signaling is only necessary at comparatively large time intervals or not at all.
  • Subscriber station based on a known channel estimate a respective strongest transmission path. Knowing this strongest transmission path, the subscriber station controls the time of transmission of the signals in the upward direction in such a way that its own strongest transmission path can be received synchronously at the location of the base station.
  • FIG. 1 shows a block diagram of a radio communication system.
  • FIG. 2 shows a schematic representation of the frame structure of a radio interface with a TD / CDMA subscriber separation method.
  • FIG. 3 shows a flow chart of the control of the synchronous transmission in the upward direction.
  • a mobile radio system consists in each case of a multiplicity of mobile switching centers MSC which belong to a switching network (SSS - Switching Subsystem) and which are networked with one another or which provide access to a fixed network, and one or more base station systems BSS (BSS) connected to these mobile switching centers MSC - Base station subsystem).
  • a base station system BSS in turn has at least one device RNC (RNC - Radio Network Controller) for assigning radio resources and at least one base station NB (NB - Node B) connected to it.
  • RNC Radio Network Controller
  • a base station NB can establish and maintain connections to subscriber stations UE (UE - User Equipment) via a radio interface.
  • At least one radio cell Z is formed by each base station NB.
  • the size of the radio cell Z is generally determined by the range of a general signaling channel (BCH - broadcast channel), which is transmitted by the base stations NB with a maximum and constant transmission power in each case.
  • BCH - broadcast channel general signaling channel
  • several radio cells Z can also be supplied per base station NB.
  • the functionality of this structure is based on other radio communications tion systems transferable, m where the invention can be used.
  • FIG. 1 shows a subscriber station UE which is located in the radio cell Z of a base station NB.
  • the subscriber station UE has set up a communication link to the base station NB, on which a selected service is transmitted in the upward UL and downward direction DL.
  • the communication connection is separated by one or more spreading codes assigned to the subscriber station UE from communication connections set up in parallel in the radio cell Z, the subscriber station UE in each case all spreading codes currently assigned to the radio cell Z for receiving the signals of its own communication connection in accordance with the known method. Detection method uses.
  • the frame structure of the radio transmission of the TD-SCDMA mobile radio system can be seen from FIG.
  • the frequency band B for the upward direction UL corresponds to the frequency band B for the downward direction DL.
  • the same is repeated for other carrier frequencies. Due to the variable allocation of the time slots ts for the upward or downward direction UL, DL, a variety of asymmetrical resource allocations can be made. Part of the time slots tdO ... tdn is used accordingly for the signal transmission in the downward direction DL (Downlmk) and the remaining time slots tu0 ... tum for the gnalu transmission in upward direction UL (Uplmk) used.
  • a protection time for separating the transmission directions DL and UL which represents the switchover point SP.
  • the protection time consists of a downward pilot time slot
  • DPTS Downlmk Pilot Time Slot
  • UPTS upmk pilot time slot
  • a set of gold codes is again used to differentiate between several subscriber stations UE in this access procedure.
  • the data d are spread individually with a fine structure, a spreading code c, so that, for example, n connections can be separated at the receiving end by this CDMA component.
  • the spreading of individual symbols of the data d has the effect that sym Q chips of the duration Tc are transmitted within the symbol duration.
  • the Q chips form the connection-specific spreading code c.
  • a channel measurement sequence tseq for a channel estimation at the receiving end is also embedded in the radio blocks.
  • a radio block is completed with a protection time gp.
  • the parameters of the radio interface used for the described TD-SCDMA system are advantageously:
  • Chip rate 1.28 Mchip / s
  • the method according to the invention will be explained by way of example with reference to FIGS. 1 and 3.
  • the signals transmitted by the base station NB reach the receiving subscriber station UE on different transmission paths, for example on the transmission paths p1 and p2. While the signals the subscriber station UE on the
  • the transmission path p1 reaches directly, the signals on the transmission path p2 arrive at the subscriber station UE due to a reflection, for example on a mountain, with a certain time delay. It is assumed that in an initial state the transmission path pl also the strongest transmission path, i.e. is the transmission path that can be received with the greatest reception power, and the signals sent in the upward direction UL can be received synchronously by the base station NB. When the subscriber station UE moves, the case now arises that the direct
  • Transmission path p1 for example due to shadowing, is no longer determined by the subscriber station UE as the strongest transmission path, but now the transmission path p2 is the strongest transmission path.
  • the subscriber station UE therefore seeks synchronization assuming that its transmission path corresponding to path p2 is received synchronously by base station NB.
  • the subscriber station UE determines, for example, a time offset dt of 2.25 chips between the arrival of the signals on the transmission path p1 in the initial state and the later arrival of the signals on the transmission path p2 in a subsequent time frame, the subscriber station UE knows that it must send out its signals in the upward direction UL by 2.25 chips earlier, so that the signals on the strongest transmission path in turn arrive synchronously at the location of the base station NB.
  • the maximum resolution can also correspond to a fraction of a chip. This independence advantageously enables very fast regulation, which can also take place within a time frame, for example.

Abstract

L'invention concerne un procédé de maintien d'une transmission de signaux synchronisée dans le sens ascendant, dans un système de radiocommunication qui met en oeuvre un procédé de séparation d'abonnés TD/CDMA pour la transmission de signaux par l'intermédiaire d'une interface radio, entre une station de base et au moins une station d'abonné, l'interface radio étant organisée selon un procédé TDD. Selon ledit procédé, après une synchronisation réussie, un décalage temporel relatif de la réception de signaux émis dans le sens descendant est déterminé par la station d'abonné, et ce décalage temporel déterminé est pris en compte pour une régulation du moment d'une émission consécutive de signaux dans le sens ascendant.
PCT/DE2000/004363 1999-12-08 2000-12-07 Procede de maintien d'une transmission de signaux synchronisee dans le sens ascendant dans un systeme de radiocommunication WO2001043307A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU30001/01A AU3000101A (en) 1999-12-08 2000-12-07 Method for maintaining a synchronised upward signal transmission in a radio communication system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 99127757 CN1299220A (zh) 1999-12-08 1999-12-08 在无线电通信系统的上行链路中保持同步信号传输的方法
CN99127757.0 1999-12-08

Publications (2)

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WO2001043307A2 true WO2001043307A2 (fr) 2001-06-14
WO2001043307A3 WO2001043307A3 (fr) 2001-12-27

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CN (1) CN1299220A (fr)
AU (1) AU3000101A (fr)
WO (1) WO2001043307A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004068763A1 (fr) * 2003-01-27 2004-08-12 Linkair Communications, Inc. Procede et appareil destines a l'acquisition de la synchronisation de la liaison montante
CN102130785A (zh) * 2011-02-17 2011-07-20 华为技术有限公司 一种时间偏差的上报方法、装置和系统
KR101211788B1 (ko) 2005-11-03 2012-12-12 지티이 코포레이션 고속 공유 정보 채널의 상향 동기 제어 방법 및 시스템

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1493125A (zh) * 2001-10-19 2004-04-28 同步码分多址通信系统的切换方法
CN1497882B (zh) * 2002-10-23 2010-04-07 华为技术有限公司 一种时分双工系统的随机接入方法
CN1838574B (zh) * 2005-03-25 2010-04-28 中兴通讯股份有限公司 时分双工码分多址系统的随机接入方法
CN1909427B (zh) * 2005-08-01 2010-12-08 北京信威通信技术股份有限公司 一种基站上行同步测试方法及测试装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0704987A2 (fr) * 1994-09-30 1996-04-03 Sony Corporation Terminal de communication à spectre étalé dans un système téléphonique cellulaire à AMDC
WO1998058463A1 (fr) * 1997-06-17 1998-12-23 Siemens Aktiengesellschaft Procede de synchronisation temporelle pour une station mobile dans un systeme de radiocommunication
EP0957592A2 (fr) * 1998-05-13 1999-11-17 Nortel Networks Corporation Alignement temporel des signaux AMRC pour la liaison montante

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0704987A2 (fr) * 1994-09-30 1996-04-03 Sony Corporation Terminal de communication à spectre étalé dans un système téléphonique cellulaire à AMDC
WO1998058463A1 (fr) * 1997-06-17 1998-12-23 Siemens Aktiengesellschaft Procede de synchronisation temporelle pour une station mobile dans un systeme de radiocommunication
EP0957592A2 (fr) * 1998-05-13 1999-11-17 Nortel Networks Corporation Alignement temporel des signaux AMRC pour la liaison montante

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004068763A1 (fr) * 2003-01-27 2004-08-12 Linkair Communications, Inc. Procede et appareil destines a l'acquisition de la synchronisation de la liaison montante
KR101211788B1 (ko) 2005-11-03 2012-12-12 지티이 코포레이션 고속 공유 정보 채널의 상향 동기 제어 방법 및 시스템
CN102130785A (zh) * 2011-02-17 2011-07-20 华为技术有限公司 一种时间偏差的上报方法、装置和系统
CN102130785B (zh) * 2011-02-17 2013-04-24 华为技术有限公司 一种时间偏差的上报方法、装置和系统

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WO2001043307A3 (fr) 2001-12-27
AU3000101A (en) 2001-06-18
CN1299220A (zh) 2001-06-13

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