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WO2008116353A1 - Station de base, structure de trame et procede de transmission de canal de synchronisation pour des systemes de duplexage par repartition dans le temps - Google Patents

Station de base, structure de trame et procede de transmission de canal de synchronisation pour des systemes de duplexage par repartition dans le temps Download PDF

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Publication number
WO2008116353A1
WO2008116353A1 PCT/CN2007/001797 CN2007001797W WO2008116353A1 WO 2008116353 A1 WO2008116353 A1 WO 2008116353A1 CN 2007001797 W CN2007001797 W CN 2007001797W WO 2008116353 A1 WO2008116353 A1 WO 2008116353A1
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WIPO (PCT)
Prior art keywords
ofdm symbol
cyclic prefix
sch
last
time slot
Prior art date
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Ceased
Application number
PCT/CN2007/001797
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English (en)
Chinese (zh)
Inventor
Shuqiang Xia
Chunli Liang
Bin Yu
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ZTE Corp
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ZTE Corp
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Publication date
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
    • H04L5/1484—Two-way operation using the same type of signal, i.e. duplex using time-sharing operating bytewise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT

Definitions

  • the present invention relates to the field of digital communications, and in particular to a cell search technique for a time division duplex system based on orthogonal frequency division multiplexing (OFDM) technology, and more particularly to a base station in an orthogonal frequency division multiplexing time division duplex (TDD) system. , frame structure, and method of transmitting signals on the Synchronization Channel (SCH).
  • OFDM orthogonal frequency division multiplexing
  • SCH Synchronization Channel
  • the capture process is also known as the cell search process.
  • the cell search mainly obtains the time and frequency synchronization with the target cell, and also obtains the target cell identification number and some basic information.
  • the cell search process is mainly based on a Synchronization Channel (SCH) (sometimes referred to as a synchronization signal), and the mobile station obtains time synchronization with the target cell, cell identification number information, and some cell/system related according to the synchronization channel. information.
  • SCH Synchronization Channel
  • the cell search process is a hierarchical process, so the corresponding synchronization channel (SCH) is divided into a primary synchronization channel (Primary SCH, P-SCH) and a secondary synchronization channel (Secondary SCH, S-SCH).
  • the P-SCH is used to implement slot timing and frequency calibration and the detection of the cell identification number in the cell identification group.
  • the S-SCH is mainly used to implement frame timing and detection of the cell identification group number and some cell/system related information.
  • FIG. 1 is a schematic diagram of a frame structure of a time division Han system based on orthogonal frequency division multiplexing.
  • a 10 ms radio frame includes two equal length subframes, each subframe having a length of 5 ms.
  • Each subframe further includes 7 general time slots and 3 special time slots: DwPTS time slot, GP time slot and UpPTS time slot.
  • the DwPTS time slot is a downlink time slot, and the downlink primary synchronization channel P-SCH is fixedly transmitted in the time slot, and the time length is 75 us.
  • the GP time slot is the uplink protection downlink time slot of the TDD system, and the time length is also 75 us.
  • the UpPTS slot is an uplink slot.
  • each general time slot is 0.675 ms, and each time slot contains several symbols with a cyclic prefix and one slot interval.
  • 2 is a conventional method for transmitting a synchronization channel.
  • the downlink primary synchronization channel P-SCH is fixedly transmitted in the DwPTS slot, and the secondary synchronization channel S-SCH is transmitted on the last OFDM symbol of TS0. Therefore, there is a slot interval (TI) between the time slot DwPTS and the last OFDM symbol of TS0, which will vary with the length of the cyclic prefix used by the TSO slot.
  • TI slot interval
  • each OFDM symbol is a long cyclic prefix, where the long cyclic prefix length is 16.67us, and the data portion length is 66.67us, and the corresponding slot interval length is 8.33us; when TS0 contains 9
  • each OFMD symbol is a short cyclic prefix, where the short cyclic prefix length is 7.29us, and the data portion length is 66.67us, and the corresponding slot interval length is 9.38us.
  • the technical problem to be solved by the present invention is to provide a method for transmitting a synchronization channel in a time division duplex system based on orthogonal frequency division multiplexing technology, so as to improve the performance of cell search and reduce the complexity of device implementation, and also improve P. -SCH as the performance of the S-SCH channel estimation.
  • the present invention is applicable to a time division duplex system in which a primary synchronization channel P-SCH is fixedly transmitted on a DwPTS time slot and a secondary synchronization channel S-SCH is transmitted on a last OFDM symbol of TS0.
  • a synchronous channel transmission method for a time division duplex system wherein a primary synchronization channel P-SCH is transmitted on a downlink time slot DwPTS, wherein: the secondary synchronization channel S-SCH is transmitted on a last OFDM symbol of TS0,
  • the last OFDM symbol includes a cyclic prefix part and a data part, and an interval between the last OFDM symbol and the downlink time slot DwPTS is a fixed value between 0 and 8.33 us, and the data part duration is related to TS0 other OFDM.
  • the data portion of the symbol is the same.
  • the fixed value is 0 us.
  • the cyclic prefix duration of the last orthogonal frequency division multiplexing OFDM symbol is 16.67 us;
  • the cyclic prefix of the last orthogonal frequency division multiplexing OFDM symbol lasts for 25 us.
  • the data portion duration of the last Orthogonal Frequency Division Multiplexing OFDM symbol is the same as the data portion of other TS0 OFDM symbols, and is 66.67us.
  • Another technical problem to be solved by the present invention is to provide a frame structure of a time division duplex system based on orthogonal frequency division multiplexing technology, each subframe including 7 general time slots and downlink time slots between TS0 and TS1.
  • the orthogonal frequency division multiplexing OFDM symbol in the TSO includes a cyclic prefix part and a data part, and is characterized in that: between the last OFDM symbol and the downlink time slot DwPTS
  • the interval is a fixed value between 0 and 8.33 us, and the data portion duration is the same as the data portion of other TS10 OFDM symbols.
  • the fixed value is 0 us.
  • the cyclic prefix duration of the OFDM symbol is 16.67us
  • the cyclic prefix of the last orthogonal frequency division multiplexing OFDM symbol lasts for 25 us.
  • the data portion duration of the last Orthogonal Frequency Division Multiplexing OFDM symbol is the same as the data portion of other TS0 OFDM symbols, and is 66.67us.
  • Another technical problem to be solved by the present invention is to provide a base station in a time division duplex system based on orthogonal frequency division multiplexing (OFDM), which is used to transmit a primary synchronization channel P-SCH on a downlink time slot DwPTS;
  • the base station is further configured to: send, on a last OFDM symbol of the TS0, a secondary synchronization channel S-SCH; the last OFDM symbol includes a cyclic prefix part and a data part, and the last OFDM symbol
  • the interval between the downlink time slot DwPTS is a fixed value between 0 and 8.33 us, and the data portion duration is the same as the data portion of other TS0 OFDM symbols. Further, the fixed value is 0 us.
  • the primary synchronization channel P-SCH is transmitted on a downlink time slot DwPTS, and is characterized in that: the secondary synchronization channel S-SCH is the last one of TS0.
  • the OFDM symbol includes two parts, a cyclic prefix part and a data part; in the OFDM symbol, the data part lasts for the same time as the data part of other TS0 OFDM symbols, both being 66.67 us; when TS0 is short
  • the cyclic prefix duration of the OFDM symbol is 16.67 us, or when TS0 is a subframe of a long cyclic prefix, the cyclic prefix of the OFDM symbol lasts for 25 us.
  • the mobile station can directly extract the S-SCH signal after completing the slot timing synchronization by using the P-SCH, thereby avoiding the step of detecting the S-SCH cyclic prefix length, which reduces the processing delay. It also reduces the implementation complexity.
  • the duration of the cyclic prefix of the S-SCH symbol is increased, this will be advantageous for improving the performance of the S-SCH symbol in the frequency selective fading channel, and the optimization scheme is compared with the existing scheme, S-SCH and P.
  • Figure 1 is a schematic diagram of a time slot structure in a TDD system.
  • FIG. 2 is a schematic diagram of a method for transmitting a conventional synchronization channel.
  • Figure 3 is a schematic diagram of transmission of a synchronization channel incorporating the present invention. Preferred embodiment of the invention
  • the slot interval has two functions: 1. Used for uplink and downlink handover protection; 2. Avoid interference between slots.
  • the TSO is followed by a DwPTS slot, both of which are downlink slots. Therefore, the slot interval of TS0 is not used for uplink and downlink handover protection but only for avoiding data of TS0 data to DwPTS. interference.
  • the data in the DwPTS is also an OFDM symbol with a cyclic prefix, and can also play a role in avoiding interference with the TS0.
  • the core idea of the present invention lies in: rationally utilizing TS0's slot interval TI as an idle resource to improve the cell search performance of the synchronization channel.
  • the method for transmitting a synchronization channel in the first OFDM-based TDD system includes: whether the OFDM symbol in the TS0 uses a long-term prefix or a short-time prefix, and between the last OFDM symbol in the TS0 and the downlink time slot DwPTS
  • the interval is a fixed value between 0 and 8.33 us.
  • the original slot interval is incorporated into the cyclic prefix of one or more TS0 OFDM symbols.
  • the original slot interval TI may be incorporated into the cyclic prefix of the last OFDM symbol of TS0.
  • the interval is taken as 8.33 us, if TS0 uses a short cyclic prefix, it may be, but is not limited to, incorporating the extra 1.05 us into the cyclic prefix of the last OFDM symbol of TS0.
  • Another time division duplex system synchronization signal transmission method provided by the present invention is: the primary synchronization channel P-SCH is transmitted on the downlink time slot DwPTS, and the original time slot interval TI is incorporated into the cyclic prefix of the last OFDM symbol in TS0.
  • the equivalent of the original OFDM symbol of the original TS0 and the slot interval TI constitutes a new OFDM symbol for transmitting the S-SCH signal.
  • the secondary synchronization channel S-SCH is transmitted on the last OFDM symbol of TS0, the OFDM symbol comprising two parts, a cyclic prefix part and a data part; in the OFDM symbol, the data part lasts for the same time as the data part of the other OFDM symbols of TS0 , all are 66.67us; the cyclic prefix part duration is equal to the original cyclic prefix time plus the slot interval TI, which is equivalent to shifting the slot interval to the front of the last OFDM symbol data portion of TS0, and together with the original cyclic prefix New extended loop prefix.
  • the cyclic prefix duration of the OFDM symbol is 16.67 us, or, when TS0 is a subframe of a long cyclic prefix, the cyclic prefix of the OFDM symbol lasts for 25 us.
  • an embodiment including the present invention will be given below by taking the time slot structure shown in FIG. 1 as an example.
  • FIG. 1 is a schematic diagram of a frame structure of a time division duplex system based on orthogonal frequency division multiplexing.
  • a 10 ms radio frame includes two equal length subframes, each subframe having a length of 5 ms.
  • Each subframe further includes 7 general time slots and 3 special time slots: DwPTS time slot, GP time slot and UpPTS time slot; three special time slots are located between the general time slots TS0 and TS1.
  • the DwPTS time slot is a downlink time slot, and the downlink synchronization channel P-SCH is fixedly transmitted in the time slot, and the time length is 75 us.
  • the GP time slot is the uplink and downlink protection time slot of the TDD system, and the time length is also 75us.
  • the UpPTS slot is an upstream slot.
  • the length of each general time slot is 0.675 ms.
  • each OFDM symbol is a long cyclic prefix with a long cyclic prefix of 16.67us, a data portion length of 66.67us, and a slot interval TI length of 8.33us.
  • each OFDM symbol is a short cyclic prefix, wherein the short cyclic prefix length is 7.29us, and the data portion length is 66.67us, and the slot interval TI length is 9.38us, usually, the slot interval is Do not send any data.
  • the up arrow indicates that the time slot is an uplink time slot
  • the downward arrow indicates that the time slot is a downlink time slot.
  • TS0 being fixed as a downlink time slot
  • TS1 is fixed as an uplink time slot
  • other time slots can be flexibly allocated as uplink or downlink time slots according to service requirements.
  • FIG. 2 shows a schematic diagram of a method for transmitting a conventional synchronization channel.
  • the S-SCH signal is transmitted on the last OFDM symbol of TS0, and the P-SCH is transmitted on the DwPTS slot.
  • the slot interval between the P-SCH and the S-SCH is an amount that varies with the cyclic prefix length used by the TS0, that is, P.
  • the interval between -SCH and S-SCH in time is not determined.
  • the transmission mode of the synchronization channel has the following disadvantages: After the mobile station obtains the slot timing synchronization using the P-SCH, the S-SCH signal cannot be directly extracted. Therefore, the S-SCH must be blindly detected. This will increase the processing delay and the implementation complexity of the mobile station.
  • FIG. 3 shows a specific implementation of the first transmission method provided by the present invention, which is an implementation situation when the interval between the last OFDM symbol and the DwPTS in the TS0 is 0 us.
  • This implementation can also be seen as another transmission method provided by the present invention.
  • the newly formed OFDM symbol includes two parts, a cyclic prefix part and a data part. In the newly formed OFDM symbol, the data portion lasts for the same time as the data portion of the other OFDM symbols of TS0, and is 66.67 us.
  • the duration of the cyclic prefix portion is the duration of the original OFDM symbol cyclic prefix of TS0 plus the duration of the slot interval TI, so the cyclic prefix duration of the new OFDM symbol depends on the cyclic prefix type used by TS0, for Figure 1
  • the illustrated frame structure has the following characteristics:
  • the cyclic prefix duration of the newly formed OFDM symbol is 16.67us
  • the cyclic prefix of the newly formed OFDM symbol lasts for 25 us.
  • the present invention also provides a frame structure of a time division duplex system based on orthogonal frequency division multiplexing (OFDM) technology, characterized in that: each subframe includes 7 general time slots and a downlink time slot DwPTS located between TS0 and TS1, Upstream and downlink protection time slot GP and uplink time slot UpPTS.
  • the TSO is a downlink time slot and includes 8 or 9 OFDM symbols.
  • Each OFDM symbol in TS0 includes two parts, a cyclic prefix part and a data part, and the duration of the data part is 66.67 us; wherein the interval between the last OFDM symbol and the downlink time slot DwPTS is between 0 and 8.33 us Fixed value.
  • the original slot interval is incorporated into the cyclic prefix of one or more TS0 OFDM symbols.
  • the time of the original TI may be incorporated into the cyclic prefix of the last OFDM symbol, that is, the subframe with the short cyclic prefix of TS0, the last one
  • the cyclic prefix duration of the OFDM symbol is 16.67us
  • the cyclic prefix duration of other OFDM symbols is 7.29us
  • the cyclic prefix duration is 16.67us.
  • the present invention also provides a base station in a time division duplex system based on orthogonal frequency division multiplexing (OFDM), the base station is configured to send a primary synchronization channel P-SCH on a downlink time slot DwPTS; The base station is further configured to send the S-SCH signal on the last OFDM symbol of the TS0, and the interval between the last OFDM symbol and the DwPTS is a fixed value between 0 and 8.33 us.
  • the original slot interval is incorporated into the cyclic prefix of the OFDM symbol in one or more TS0s.
  • the last OFDM symbol of the original TS0 and the slot interval TI may be formed into a new OFDM symbol as the last OFDM symbol in TS0.
  • the newly formed OFDM symbol comprises two parts, a cyclic prefix part and a data part.
  • the data portion lasts for the same time as the data portion of the other OFDM symbols of TS0, which is 66.67 us; for the subframe where TS0 is a short cyclic prefix, the cyclic prefix duration of the newly formed OFDM symbol is 16.67.
  • the cyclic prefix of the newly formed OFDM symbol lasts for 25 us.
  • TS0 adopts a short cyclic prefix, it may be, but is not limited to, incorporating the extra 1.05 us into the cyclic prefix of the last OFDM symbol of TS0.
  • the P-SCH and the S-SCH are aligned in time regardless of the cyclic prefix of the length used by the TS0. Therefore, when the mobile station utilizes the P-SCH After the timing is completed, the S-SCH symbol can be directly extracted, and the S-SCH cyclic prefix blind detection operation is not required.
  • the technical solution of the present invention enables the mobile station to directly extract the S-SCH symbol after completing the timing by using the P-SCH, thereby shortening the cell search time and reducing the implementation complexity of the mobile station.
  • the optimization scheme is also beneficial to improve the performance of the S-SCH symbol in the frequency selective fading channel, and further improve the channel estimation performance of the P-SCH as the S-SCH coherent demodulation.

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

Abstract

L'invention concerne une station de base, une structure de trame et un procédé de transmission de canal de synchronisation pour des systèmes de duplexage par répartition dans le temps. Selon ce procédé : le canal de synchronisation primaire P-SCH est transmis dans le créneau de liaison descendante DwPTS; le canal de synchronisation secondaire S-SCH est transmis dans le dernier symbole MROF de TS0, ce dernier symbole MROF comprenant un préfixe cyclique et une partie données, l'intervalle entre le dernier symbole MROF et le créneau de liaison descendante DwPTS étant une valeur constante dans 0~8.33us et la durée de la partie données étant égale à la partie donnée d'autres symboles MROF dans TS0. Le canal S-SCH peut être extrait directement après la synchronisation P-SCH de la station mobile, ce qui réduit le temps de recherche de cellule et la complexité de la station mobile.
PCT/CN2007/001797 2007-03-28 2007-06-06 Station de base, structure de trame et procede de transmission de canal de synchronisation pour des systemes de duplexage par repartition dans le temps Ceased WO2008116353A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNB2007100739719A CN100502282C (zh) 2007-03-28 2007-03-28 一种时分双工系统同步信号发送方法
CN200710073971.9 2007-03-28

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WO2008116353A1 true WO2008116353A1 (fr) 2008-10-02

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CN101415233B (zh) * 2007-10-15 2010-06-16 大唐移动通信设备有限公司 一种资源分配的方法和装置
CN101159530B (zh) * 2007-10-29 2011-11-23 中兴通讯股份有限公司 数据传输方法
CN101425841B (zh) * 2007-11-02 2012-06-27 电信科学技术研究院 时分双工系统的数据传输方法及装置
CN101431365B (zh) * 2007-11-09 2012-08-08 电信科学技术研究院 时分双工系统数据传输方法
CN101222274B (zh) * 2008-01-25 2013-02-27 中兴通讯股份有限公司 时分双工系统中同步信号的发送方法和装置
CN101222272B (zh) 2008-01-28 2012-10-10 中兴通讯股份有限公司 下行导频时隙中物理下行控制信道的信号发送方法
CN101499963B (zh) * 2008-02-03 2011-07-20 大唐移动通信设备有限公司 一种下行传输的方法和装置
US8576786B2 (en) 2008-12-31 2013-11-05 Mediatek Synchronization channel for advanced wireless OFDM/OFDMA systems
CN102857460B (zh) * 2011-06-30 2015-11-25 上海贝尔股份有限公司 在无线通信系统中进行数据传输的方法和装置
CN104468011B (zh) * 2013-09-22 2018-03-23 中国移动通信集团设计院有限公司 一种模拟测试终端及信号处理方法
CN105577320B (zh) * 2014-10-17 2018-10-30 电信科学技术研究院 一种数据传输方法及装置
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CN101035371A (zh) 2007-09-12

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