WO2006067658A2 - Procede et appareil de synchronisation de creneaux temporels dans un systeme de communication sans fil - Google Patents

Procede et appareil de synchronisation de creneaux temporels dans un systeme de communication sans fil Download PDF

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Publication number
WO2006067658A2
WO2006067658A2 PCT/IB2005/054117 IB2005054117W WO2006067658A2 WO 2006067658 A2 WO2006067658 A2 WO 2006067658A2 IB 2005054117 W IB2005054117 W IB 2005054117W WO 2006067658 A2 WO2006067658 A2 WO 2006067658A2
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WO
WIPO (PCT)
Prior art keywords
midamble
time slot
mobile terminal
time parameter
elements
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Application number
PCT/IB2005/054117
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English (en)
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WO2006067658A3 (fr
Inventor
Yan Li
Xia Zhu
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Koninklijke Philips Electronics N.V.
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Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2006067658A2 publication Critical patent/WO2006067658A2/fr
Publication of WO2006067658A3 publication Critical patent/WO2006067658A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H04W56/007—Open loop measurement
    • H04W56/0075—Open loop measurement based on arrival time vs. expected arrival time
    • H04W56/0085—Open loop measurement based on arrival time vs. expected arrival time detecting a given structure in the signal

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for time slot synchronization of mobile terminal and the apparatus therefor.
  • Time division synchronization code division multiple access is one of specifications for the third generation mobile communication air interface formally released by the International Telecommunication Union (ITU). It adopts the transmission mode of time division duplex (TDD), under which the physical channel appears as a burst.
  • TDD time division duplex
  • Fig. 1 shows a standard subframe structure of TD-SCDMA.
  • the length of the subframe is 5ms, i.e. 6400 chips.
  • Each subframe is divided into 7 main time slots (TS0-TS6) and 3 special time slots: downlink pilot time slots (DwPTS) of 96 chips, guard period (GP) of 96 chips and up link pilot time slots (UpPTS) of 160 chips.
  • the length of each main time slot is 0.675ms, i.e. 864 chips, wherein TSO is a downlink time slot, TSl is a uplink time slot, while the remaining main time slots can be configured flexibly to be used for down/uplink according to the user need.
  • the burst is sent in a specific main time slot, which mainly consists of two fields, i.e. traffic and signaling data fields, totaling 704 chips with time length of 675 ⁇ s, wherein each data field (data 1, data 2) is of 352 chips respectively.
  • each main time slot further comprises a midamble (training sequence) of 144 chips located between data 1 and data 2 and a guard period (GP) of the last 16 chips, wherein midambles for different users are acquired by performing cyclic shift on a cell- specific fundamental midamble.
  • a mobile terminal In a wireless communication system adopting TD-SCDMA, a mobile terminal first establishes downlink synchronization by acquiring and identifying DwPTS. After the down link synchronization is established, the mobile terminal could read the cell's common control information from a broadcast channel by calculating a basic midamble and scrambling code through current DwPTS.
  • the downlink synchronization could also be referred to as subframe synchronization because the DwPTS appears only once in each subframe.
  • a coarse time parameter of the midamble in the subframe could be obtained. Making use of fairly good autocorrelation of midambles, the time slot synchronization between a transmitter and a receiver could be achieved.
  • a TD-SCDMA system usually adopts matching filter to perform time slot synchronization.
  • Fig. 2 and Fig. 3 illustrate related operation procedure, wherein a conventional mobile terminal could obtain a coarse time parameter of a midamble through cell search first, then it selects a small range with respect to said coarse time parameter to perform sliding correlation calculation between an input data stream and an expected midamble within said range by means of the matching filter. An accurate time parameter of the midamble can be determined from the maximum value of the correlation calculation results.
  • Fig. 3 is a partial block diagram of time slot synchronization in a conventional mobile terminal, wherein a sliding correlation calculations between a part of the received signal x(t) that locates within the range of a coarse time parameter of a midamble and an expected midamble are performed in correlation module 10'.
  • the correlation module 10' performs the following algorithm: t r a + ⁇ + L m -l
  • R 1 ⁇ x(t) • midamble '[t - (t r0 + i) + l], -w ⁇ i ⁇ w , ⁇
  • R 1 represents the results of correlation calculations
  • L m is the length of the midamble
  • x(t) is the signal received by the mobile terminal
  • t r o represents the time position of the midamble
  • [t r o- w, t r o+w] represents the range taken on the basis of the coarse time parameter
  • midamble [t — (t r0 + i) + 1] is the conjugate of the expected midamble.
  • the maximum value of the calculation result of expression (1) is selected in accurate synchronization module 20', and thus an accurate time parameter of the midamble is determined.
  • Accurate synchronization module 20' comprises an integrator, and accurate synchronization module 20' performs the following algorithm:
  • R 1 - represents the maximum value after correlation calculations
  • t r represents the accurate time parameter of the midamble.
  • An object of the present invention is to provide a method and apparatus of time slot synchronization for mobile terminal in wireless communication system. Said method and apparatus could reduce the complexity of correlation calculation and corresponding cost of hardware module in time slot synchronization.
  • an apparatus in accordance with an embodiment of the present invention, which comprises: first obtaining a coarse time parameter of a midamble in a time slot of a signal received by the mobile terminal, then based on the coarse time parameter, performing correlation calculation between symmetrical specific sequences of a signal sequence in said time slot which conforms to the midamble, and in the end, comparing the results of correlation calculations to determine an accurate time parameter of the midamble, thus achieving synchronization of said time slot.
  • the beneficial effect of the present invention is: the correlation calculation in a method of time slot synchronization is performed between partial sequences of a midamble, without having to perform correlation calculation between the entire midamble and an expected midamble, thus effectively reducing the calculation amount and achieving time slot synchronization faster.
  • an apparatus for time slot synchronization in a mobile terminal in the invention has lower hardware complexity and cost as compared with the prior art.
  • Fig. 1 illustrates a standard subframe structure of a TD-SCDMA system
  • Fig. 2 illustrates a schematic diagram of the correlation operation of a method for time slot synchronization in a mobile terminal according to the prior art
  • Fig. 3 illustrates a partial block diagram of a mobile terminal for time slot synchronization according to the prior art
  • Fig. 4 illustrates a typical midamble structure of a TD-SCDMA system
  • Fig. 5 illustrates a flow chart of a method for time slot synchronization in a mobile terminal according to the present invention
  • Fig. 6 illustrates a schematic diagram of correlation operations of a method for time slot synchronization in a mobile terminal according to the present invention
  • Fig. 7 illustrates a partial block diagram of an apparatus for time slot synchronization in a mobile terminal according to the present invention
  • each cell has specific basic midamble of 128 chips, and said basic midamble is cyclically shifted to generate different midambles of 144 chips, which can be used by different users in the cell separately.
  • midamble in is a subset of m' , it also has the characteristic of periodic cycles, the sequence of its first 16 chips being completely identical with that of the last 16 chips.
  • the symmetry of a midamble is illustrated in Fig. 4.
  • a method for time slot synchronization in a mobile terminal comprises: first receiving signal x(t) (step SlOO), then performing cell search on the received signal x(t) (stepSHO), obtaining subframe synchronization, and learning therefrom a coarse time parameter of a midamble in the time slot.
  • step S 120 a small range [Ww, t r0 +w] with respect to said coarse time parameter is selected, wherein t ⁇ represents the time position of the midamble.
  • t ⁇ represents the time position of the midamble.
  • autocorrelation calculations between signal sequences that correspond to the first 16 chips and last 16 chips at the time parameter position conforming to the midamble are performed (step S 120).
  • the operation procedure of the autocorrelation calculation is illustrated in Fig. 6.
  • the algorithm performed by step S 120 is as below: f r0 +1+15
  • R 1 ⁇ x(t)x ' (t + m ⁇ c ), - w ⁇ i ⁇ w (3)
  • R 1 represents the results of correlation calculations
  • T c is code rate
  • x(t) is the first 16 chips at the time parameter position that conforms to the midamble
  • + l28T L is the last 16 chips at the time parameter position that conforms to the midamble.
  • step S130 an accurate time parameter t r o of the midamble is determined from a maximum value of the correlation calculation results (step S130), thus completing the synchronization of said time slot.
  • R 1 - represents the maximum value after correlation calculations
  • t r represents the accurate time parameter of the midamble.
  • Fig. 6 is a partial block diagram of an apparatus for time slot synchronization in a mobile terminal according to an embodiment in the present invention, which includes autocorrelation module 10, accurate synchronization module 20 and delay module 30.
  • Delay module 30 delays the last 16 chips at the time parameter position that conforms to the midamble in the received signal x(t) after subframe synchronization by a length of 128 chips, then outputs the delayed chips to autocorrelation module 10, to perform their correlation calculation with the first 16 chips at the time parameter position that conforms to the midamble in the received signal x(t).
  • Accurate synchronization module 20 finds a maximum value of the correlation calculation results outputted from autocorrelation module 10 and determines an accurate time parameter of the midamble.
  • a method for time slot synchronization in a mobile terminal according to the present invention it only needs to perform multiplication of 16 elements for each correlation calculation, which effectively reduces the calculation amount and achieves time slot synchronization faster as compared with the multiplication of 144 elements used in the prior art.
  • an apparatus for time slot synchronization in a mobile terminal according to the present invention has lower hardware complexity and cost as compared with the prior art because only 16 multipliers are involved.
  • the above embodiment illustrates the present invention mainly with respect to a TD-SCDMA system.
  • the present invention could also be applied to other wireless communication systems, as long as the sequences for synchronization of the wireless communication systems possess symmetry similar to the midamble of the TD- SCDMA system.

Abstract

L'invention concerne un procédé de synchronisation de créneaux temporels dans un terminal mobile ainsi que l'appareil à cet effet. L'appareil acquiert d'abord un paramètre temporel approximatif d'un préambule intermédiaire dans un créneau temporel d'un signal reçu par le terminal mobile. Ensuite, cet appareil exécute un calcul de corrélation entre des séquences de signaux spécifiques dans une séquence conforme au préambule intermédiaire et leurs séquences de signaux spécifiques correspondantes respectives sur la base du paramètre temporel approximatif. Enfin, ledit appareil compare les résultats dudit calcul de corrélation pour déterminer un paramètre temporel précis du préambule intermédiaire, effectuant ainsi la synchronisation de créneaux temporels. Ce procédé et cet appareil permettent de réduire la complexité du calcul de corrélation et le coût matériel correspondant.
PCT/IB2005/054117 2004-12-24 2005-12-08 Procede et appareil de synchronisation de creneaux temporels dans un systeme de communication sans fil WO2006067658A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200410011504.X 2004-12-24
CN200410011504 2004-12-24

Publications (2)

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WO2006067658A2 true WO2006067658A2 (fr) 2006-06-29
WO2006067658A3 WO2006067658A3 (fr) 2006-08-31

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003032512A1 (fr) * 2001-10-11 2003-04-17 Interdigital Technology Corporation Circuit d'acquisition pour option faible debit d'elements d'un systeme de telecommunications mobile
US20030076812A1 (en) * 2000-02-24 2003-04-24 Benedittis Rosella De Method for optimizing the random access procedures in the cdma cellular networks
WO2004059864A1 (fr) * 2002-12-30 2004-07-15 Koninklijke Philips Electronics N.V. Procede et dispositif de maintien d'une localisation de synchronisation dans une communication drt sans fil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030076812A1 (en) * 2000-02-24 2003-04-24 Benedittis Rosella De Method for optimizing the random access procedures in the cdma cellular networks
WO2003032512A1 (fr) * 2001-10-11 2003-04-17 Interdigital Technology Corporation Circuit d'acquisition pour option faible debit d'elements d'un systeme de telecommunications mobile
WO2004059864A1 (fr) * 2002-12-30 2004-07-15 Koninklijke Philips Electronics N.V. Procede et dispositif de maintien d'une localisation de synchronisation dans une communication drt sans fil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Universal Mobile Telecommunications System (UMTS); Physical layer procedures (TDD) (3GPP TS 25.224 version 6.2.0 Release 6); ETSI TS 125 224" ETSI STANDARDS, EUROPEAN TELECOMMUNICATIONS STANDARDS INSTITUTE, SOPHIA-ANTIPO, FR, vol. 3-R1, no. V620, September 2004 (2004-09), XP014016728 ISSN: 0000-0001 *

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