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WO2008116353A1 - A base station, frame structure and synchronization channel transmittion method for time division duplex systems - Google Patents

A base station, frame structure and synchronization channel transmittion method for time division duplex systems 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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Prior art keywords
ofdm symbol
cyclic prefix
sch
last
time slot
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PCT/CN2007/001797
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French (fr)
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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    • 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

A base station, frame structure and synchronization channel transmission method for time division duplex systems, including: the Primary Synchronization Channel P-SCH is transmitted in downlink slot DwPTS, the Secondary Synchronization Channel S-SCH is transmitted in the last OFDM symbol of TS0, the last OFDM symbol has cyclic prefix and data part, where the interval between the last OFDM symbol and the downlink slot DwPTS is a constant value in 0~8.33us, and the duration of the data part is equal to the data part of other OFDM symbols in TS0. The S-SCH can be extracted directly after the P-SCH synchronization of the mobile station, thus the cell search time and the complexity of the mobile station are decreased.

Description

一种时分双工系统基站、 帧结构及同步信道发送方法  Time division duplex system base station, frame structure and synchronization channel transmitting method

技术领域 Technical field

本发明涉及数字通信领域，特别是涉及基于正交频分复用技术的时分双 工系统的小区搜索技术， 具体地说， 是涉及正交频分复用时分双工 （TDD ) 系统中的基站、 帧结构， 及同步信道（ Synchronization Channel, SCH )上信 号的发送方法。  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).

背景技术 Background technique

当移动台开机或失去网络服务时， 需要通过初始捕获过程来捕获系统， 捕获系统意味着识别出移动台要待机并且解调出广播信道中的系统信息的 小区。捕获过程也称为小区搜索过程。 小区搜索主要是获得与目标小区的时 间和频率同步， 同时还获得目标小区识别号以及一些基本信息。 小区搜索过 程主要是基于同步信道（ Synchronization Channel, SCH ) (有时也称为同步 信号）进行的， 移动台根据同步信道获得了与目标小区的时间同步、 小区识 别号信息以及一些小区 /系统相关的信息。  When the mobile station is powered on or loses network service, it is necessary to capture the system through an initial acquisition process, which means identifying a cell in which the mobile station is to wait and demodulate system information in the broadcast 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.

通常来说， 小区搜索过程是一个分级的过程， 因此对应的同步信道 ( SCH )分为主同步信道（ Primary SCH, P-SCH )和辅助同步信道（ Secondary SCH, S-SCH ) 。 其中， P-SCH用来实现时隙定时和频率校准以及小区识别 组内小区识别号的检测， S-SCH主要用来实现帧定时以及小区识别组号和一 些小区 /系统相关信息的检测。  Generally speaking, 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.

图 1是一种基于正交频分复用技术的时分汉工系统的帧结构示意图。在 该示意图中， 10ms的无线帧包括两个等长的子帧， 每个子帧的长度为 5ms。 每个子帧又包括 7个一般时隙和 3个特殊时隙： DwPTS时隙、 GP时隙和 UpPTS时隙。 其中， DwPTS时隙为下行时隙， 下行主同步信道 P-SCH固定 在该时隙发送， 其时间长度为 75us。 GP时隙为 TDD系统上下行保护时隙， 时间长度也是 75us。 UpPTS时隙为上行时隙。 每个一般时隙的时间长度为 0.675ms, 每个时隙都包含若干个带循环前缀的符号和一个时隙间隔。 图 2 为现有的同步信道的发送方法， 从图可以看出， 下行主同步信道 P-SCH固定在 DwPTS时隙发送，而辅助同步信道 S-SCH在 TS0的最后一个 OFDM符号上发送。 因此， 在时隙 DwPTS与 TS0的最后一个 OFDM符号 之间有一个时隙间隔 （ Timeslot Interval, TI ) ， 这个时隙间隔将随着 TSO时 隙所采用的循环前缀长度的不同而不同。 当 TS0包含 8个 OFDM符号时， 每个 OFDM符号为长循环前缀， 其中长循环前缀长度为 16.67us， 而数据部 分长度为 66.67us,相应的 了时隙间隔长度为 8.33us;当 TS0包含 9个 OFDM 符号时， 每个 OFMD符号为短循环前缀， 其中短循环前缀长度为 7.29us, 而数据部分长度为 66.67us, 相应的时隙间隔长度为 9.38us。 FIG. 1 is a schematic diagram of a frame structure of a time division Han system based on orthogonal frequency division multiplexing. In the diagram, 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. The length of 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. As can be seen from the figure, 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. When TS0 includes 8 OFDM symbols, 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 For each OFDM symbol, 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.

由于时隙 DwPTS与 TSO之间的时隙间隔不固定， 采用现有的同步信道 发送方法， 在接收完 P-SCH信号完成时隙定时检测后， 并不能直接得到 S-SCH信号的定时信息， 因此移动台必须对 S-SCH进行盲检测。 这无疑增 加了小区搜索的时间以及移动台的实现复杂度。 发明内容  Since the slot interval between the time slot DwPTS and the TSO is not fixed, the existing synchronization channel transmission method is adopted, and after the P-SCH signal is received, the timing information of the S-SCH signal cannot be directly obtained after the slot timing detection is completed. Therefore, the mobile station must perform blind detection on the S-SCH. This undoubtedly increases the time of cell search and the complexity of the implementation of the mobile station. Summary of the invention

本发明所要解决的技术问题在于提供一种基于正交频分复用技术的时 分双工系统中同步信道的发送方法，以提高小区搜索的性能和降低设备实现 的复杂度同时还有利于提高 P-SCH作为 S-SCH信道估计的性能。 本发明适 用于主同步信道 P-SCH固定在 DwPTS时隙上发送， 辅助同步信道 S-SCH 在 TS0最后一个 OFDM符号上发送的时分双工系统。  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.

本发明采用的技术方案是：  The technical solution adopted by the invention is:

一种时分双工系统同步信道发送方法， 主同步信道 P-SCH在下行时隙 DwPTS上发送， 其特征在于： 辅助同步信道 S-SCH在 TS0最后一个正交频 分复用 OFDM符号上发送， 该最后一个 OFDM符号包括循环前缀部分和数 据部分，且该最后一个 OFDM符号的与下行时隙 DwPTS之间的间隔为一个 0~8.33 us之间的固定值， 其数据部分持续时间与 TS0其他 OFDM符号的数 据部分相同。  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.

进一步地， 所述固定值为 0 us。 进一步地，对于 TSO为短循环前缀的子帧，所述最后一个正交频分复用 OFDM符号的循环前缀持续时间为 16.67us; Further, the fixed value is 0 us. Further, for a subframe in which the TSO is a short cyclic prefix, the cyclic prefix duration of the last orthogonal frequency division multiplexing OFDM symbol is 16.67 us;

对于 TS0为长循环前缀的子帧， 所述最后一个正交频分复用 OFDM符 号的循环前缀持续的时间为 25us。  For a subframe in which TS0 is a long cyclic prefix, the cyclic prefix of the last orthogonal frequency division multiplexing OFDM symbol lasts for 25 us.

进一步地， 所述最后一个正交频分复用 OFDM符号的数据部分持续时 间与 TS0其他 OFDM符号的数据部分相同， 均是 66.67us。  Further, 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.

本发明所要解决的又一技术问题是提供一种基于正交频分复用技术的 时分双工系统的帧结构， 每个子帧包括 7个一般时隙以及位于 TS0和 TS1 之间的下行时隙 DwPTS、 上下行保护时隙 GP和上行时隙 UpPTS; TSO中 的正交频分复用 OFDM符号包括循环前缀部分和数据部分， 其特征在于： 该最后一个 OFDM符号与下行时隙 DwPTS之间的间隔为一个 0〜8.33 us之 间的固定值，其数据部分持续时间与 TS0其他 OFDM符号的数据部分相同。 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. DwPTS, uplink and downlink protection time slot GP and uplink time slot UpPTS; 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.

进一步地， 所述固定值为 0 us。  Further, the fixed value is 0 us.

进一步地，对于 TS0为短循环前缀的子帧，所述最后一个正交频分复用 Further, for a subframe in which TS0 is a short cyclic prefix, the last orthogonal frequency division multiplexing

OFDM符号的循环前缀持续时间为 16.67us; The cyclic prefix duration of the OFDM symbol is 16.67us;

对于 TS0为长循环前缀的子帧， 所述最后一个正交频分复用 OFDM符 号的循环前缀持续的时间为 25us。  For a subframe in which TS0 is a long cyclic prefix, the cyclic prefix of the last orthogonal frequency division multiplexing OFDM symbol lasts for 25 us.

进一步地， 所述最后一个正交频分复用 OFDM符号的数据部分持续时 间与 TS0其他 OFDM符号的数据部分相同， 均是 66.67us。  Further, 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.

本发明所要解决的又一技术问题在于提供一种基于正交频分复用技术 的时分双工系统中的基站， 所述基站用于在下行时隙 DwPTS上发送主同步 信道 P-SCH; 其特征在于： 所述基站还用于在 TS0最后一个正交频分复用 OFDM符号上发送辅助同步信道 S-SCH; 该最后一个 OFDM符号包括循环 前缀部分和数据部分，且该最后一个 OFDM符号的与下行时隙 DwPTS之间 的间隔为一个 0~8.33 us之间的固定值， 其数据部分持续时间与 TS0其他 OFDM符号的数据部分相同。 进一步地， 所述固定值为 0 us。 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.

本发明所要解决的又一技术问题是提供一种时分双工系统同步信号发 送方法， 主同步信道 P-SCH在下行时隙 DwPTS上发送， 其特征在于： 辅助 同步信道 S-SCH在 TS0最后一个 OFDM符号上发送，所述 OFDM符号包括 两部分， 循环前缀部分和数据部分； 在该 OFDM符号中， 数据部分持续的 时间与 TS0其他 OFDM符号的数据部分相同， 都是 66.67us; 当 TS0为短循 环前缀的子帧时， OFDM符号的循环前缀持续时间为 16.67us， 或， 当 TS0 为长循环前缀的子帧时， OFDM符号的循环前缀持续的时间为 25us。 Another technical problem to be solved by the present invention is to provide a synchronization signal transmission method for a time division duplex system. 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. Transmitted on an OFDM symbol, 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 When the subframe of the cyclic prefix is cyclic, 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.

利用本发明所提供的技术方案， 移动台在利用 P-SCH完成时隙定时同 步后可以直接提取 S-SCH信号，避免了对 S-SCH循环前缀长度检测的步骤 , 既减少了处理延时， 又降低了实现复杂度。 同时， 由于 S-SCH符号循环前 缀的持续时间增加了， 这将有利于提高 S-SCH符号在频率选择性衰落信道 中的性能， 并且， 优化方案和现有方案相比， S-SCH与 P-SCH相隔更为接 近了 （只相差一个 P-SCH符号的循环前缀的间隔， 而以前相差一个 P-SCH 符号的循环前缀加一个时隙间隔） , 因此， P-SCH作为 S-SCH相干解调的 信道估计性能将进一步提高。 附图概述 With the technical solution provided by the present invention, 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. At the same time, since 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. -SCH is closer to each other (only the interval of the cyclic prefix of one P-SCH symbol differs, and the cyclic prefix of a P-SCH symbol previously differs by one slot interval), therefore, P-SCH acts as a S-SCH coherent solution The channel estimation performance of the tone will be further improved. BRIEF abstract

图 1 是一个 TDD系统中时隙结构示意图。  Figure 1 is a schematic diagram of a time slot structure in a TDD system.

图 2是一个现有的同步信道的发送方法示意图。  2 is a schematic diagram of a method for transmitting a conventional synchronization channel.

图 3 是一个包含本发明的同步信道的发送示意图。 本发明的较佳实施方式  Figure 3 is a schematic diagram of transmission of a synchronization channel incorporating the present invention. Preferred embodiment of the invention

为了解决现有技术中存在的问题， 改进基于正交频分复用的 TDD系统 中同步信道的发送方法是非常必要的。 在通常的 TDD系统中， 时隙间隔有 两个作用： 1. 用于上下行切换保护； 2. 避免时隙间的干扰。 但是在基于 OFDM技术的 TDD系统中， TSO的后面是 DwPTS时隙，二者都是下行时隙， 因此， TS0的时隙间隔没有用于上下行切换保护而只是用于避免 TS0的数据 对 DwPTS的数据的干扰。 而 DwPTS中的数据也是带循环前缀的 OFDM符 号， 也可以起到避免和 TS0之间的干扰的作用。 In order to solve the problems existing in the prior art, it is very necessary to improve the transmission method of the synchronization channel in the TDD system based on orthogonal frequency division multiplexing. In a typical TDD system, the slot interval has two functions: 1. Used for uplink and downlink handover protection; 2. Avoid interference between slots. But based on In the TDD system of OFDM technology, 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.

本发明的核心思想就在于： 合理的利用 TS0的时隙间隔 TI这一闲置的 资源， 以改善同步信道的小区搜索性能。  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.

本发明所提供的第一种基于 OFDM的 TDD系统中同步信道的发送方法 包括： 无论 TS0中的 OFDM符号采用长时间前缀还是短时间前缀， TS0中 最后一个 OFDM符号与下行时隙 DwPTS之间的间隔为一个 0~8.33 us之间 的固定值。 将原时隙间隔时间并入到一个或一个以上的 TS0中 OFDM符号 的循环前缀里。  The method for transmitting a synchronization channel in the first OFDM-based TDD system provided by the present invention 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.

当所述间隔取为 0 us时， 可以但不限于将原先的时隙间隔 TI并入 TS0 最后一个 OFDM符号的循环前缀中。 当所述间隔取为 8.33 us时， 如果 TS0 釆用短循环前缀，则可以但不限于将多出的 1.05 us并入 TS0最后一个 OFDM 符号的循环前缀中。  When the interval is taken as 0 us, the original slot interval TI may be incorporated into the cyclic prefix of the last OFDM symbol of TS0. When 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.

本发明所提供的另一种时分双工系统同步信号发送方法为：主同步信道 P-SCH在下行时隙 DwPTS上发送， 将原先的时隙间隔 TI并入 TS0中最后 一个 OFDM符号的循环前缀中，相当于将原来 TS0最后一个 OFDM符号与 时隙间隔 TI组成一个新的 OFDM符号，用来发送 S-SCH信号。辅助同步信 道 S-SCH在 TS0最后一个 OFDM符号上发送，所述 OFDM符号包括两部分， 循环前缀部分和数据部分；在该 OFDM符号中，数据部分持续的时间与 TS0 其他 OFDM符号的数据部分相同， 都是 66.67us; 循环前缀部分持续时间等 于原循环前缀时间加上时隙间隔 TI， 即等同于把时隙间隔 ΤΙ移到 TS0最后 一个 OFDM符号数据部分的前面， 和原循环前缀一起组成一个新的扩展了 的循环前缀。 当 TS0为短循环前缀的子帧时， OFDM符号的循环前缀持续 时间为 16.67us, 或， 当 TS0为长循环前缀的子帧时， OFDM符号的循环前 缀持续的时间为 25us。 为便于深刻理解本发明， 下面以图 1所示的时隙结构为例， 给出包含本 发明的实施例。 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. When TS0 is a subframe of a short cyclic 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. In order to facilitate a deep understanding of the present invention, an embodiment including the present invention will be given below by taking the time slot structure shown in FIG. 1 as an example.

图 1是一种基于正交频分复用技术的时分双工系统的帧结构示意图。在 该示意图中， 10ms的无线帧包括两个等长的子帧， 每个子帧的长度为 5ms。 每个子帧又包括 7个一般时隙和 3个特殊时隙： DwPTS时隙、 GP时隙和 UpPTS时隙； 三个特殊时隙位于一般时隙 TS0和 TS1之间。 其中， DwPTS 时隙为下行时隙， 下行同步信道 P-SCH 固定在该时隙发送， 其时间长度为 75us。 GP时隙为 TDD 系统上下行保护时隙， 时间长度也是 75us。 UpPTS 时隙为上行时隙。 每个一般时隙的时间长度为 0.675ms。  FIG. 1 is a schematic diagram of a frame structure of a time division duplex system based on orthogonal frequency division multiplexing. In the diagram, 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.

对于 TS0, 它包括 8个或者 9个 OFDM符号和一个时隙间隔， 其中， 用于信道估计的公共导频信号位于第一个和倒数第三个 OFDM符号中。 当 它包括 8个 OFDM符号时， 每个 OFDM符号为长循环前缀， 其中长循环前 缀长度为 16.67us, 而数据部分长度为 66.67us， 时隙间隔 TI长度为 8.33us。 当它包括 9个 OFDM符号时， 每个 OFDM符号为短循环前缀， 其中短循环 前缀长度为 7.29us， 而数据部分长度为 66.67us, 时隙间隔 TI长度为 9.38us, 通常，时隙间隔中不发送任何数据。另夕卜，向上箭头表示该时隙是上行时隙， 向下箭头表示该时隙是下行时隙。 除了 TS0固定为下行时隙， TS1固定为上 行时隙外， 其它时隙都可以根据业务需要灵活的分配为上行或者下行时隙。  For TS0, it includes 8 or 9 OFDM symbols and a slot interval, where the common pilot signal for channel estimation is located in the first and last third OFDM symbols. When it includes 8 OFDM symbols, 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. When it includes 9 OFDM symbols, 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. In addition, the up arrow indicates that the time slot is an uplink time slot, and the downward arrow indicates that the time slot is a downlink time slot. In addition to TS0 being fixed as a downlink time slot, TS1 is fixed as an uplink time slot, and other time slots can be flexibly allocated as uplink or downlink time slots according to service requirements.

图 2给出了一个现有的同步信道的发送方法示意图。 在该示意图中， S-SCH信号在 TS0的最后一个 OFDM符号上发送， P-SCH在 DwPTS时隙 上发送。 由于 TS0可以采用长循环前缀结构也可以采用短循环前缀结构， 因此， P-SCH与 S-SCH之间的时隙间隔是一个随 TS0所采用的循环前缀长 度而变化的量， 也就是说 P-SCH和 S-SCH在时间上的间隔并不确定。 这种 同步信道的发送方式具有如下缺点： 移动台端在利用 P-SCH获得时隙定时 同步后， 无法直接提取 S-SCH信号。 因此， 必须对 S-SCH进行盲检测。 这 将增加处理时延和移动台的实现复杂度。  Figure 2 shows a schematic diagram of a method for transmitting a conventional synchronization channel. In this diagram, the S-SCH signal is transmitted on the last OFDM symbol of TS0, and the P-SCH is transmitted on the DwPTS slot. Since the TS0 can adopt a long cyclic prefix structure or a short cyclic prefix structure, 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.

图 3给出了本发明提供的第一种发送方法的一种具体实现方案，是 TS0 中最后一个 OFDM符号与 DwPTS的间隔为 0 us时的实现情况的一种。相当 于将原来 TS0最后一个 OFDM符号与时隙间隔 TI形成一个新的 OFDM符 号， 来作为 TSO中最后一个 OFDM符号， 用以发送 S-SCH信号。 该实现方 案也可以看作是本发明所提供的另一种发送方法。 该新形成的 OFDM符号 包括两部分， 循环前缀部分和数据部分。 在所述新形成的 OFDM符号中， 数据部分持续的时间与 TS0其他 OFDM符号的数据部分相同，都是 66.67us。 循环前缀部分的持续时间为原来 TS0的 OFDM符号循环前缀的持续时间加 上时隙间隔 TI的持续时间， 因此新 OFDM符号的循环前缀持续时间取决于 TS0所采用的循环前缀类型， 对于图 1所示的帧结构， 其具有如下特征：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. Equivalent to forming a new OFDM symbol from the last OFDM symbol of the original TS0 and the slot interval TI The number is used as the last OFDM symbol in the TSO to transmit the S-SCH signal. 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:

( 1 )对于 TS0为短循环前缀的子帧，新形成的 OFDM符号的循环前缀 持续时间为 16.67us; (1) For a subframe in which TS0 is a short cyclic prefix, the cyclic prefix duration of the newly formed OFDM symbol is 16.67us;

( 2 )对于 TS0为长循环前缀的子帧， 新形成的 OFDM符号的循环前缀 持续的时间为 25us。  (2) For a subframe in which TS0 is a long cyclic prefix, the cyclic prefix of the newly formed OFDM symbol lasts for 25 us.

本发明还提供了一种基于正交频分复用技术的时分双工系统的帧结构， 其特征在于： 每个子帧包括 7个一般时隙以及位于 TS0和 TS1之间的下行 时隙 DwPTS、 上下行保护时隙 GP和上行时隙 UpPTS。 所述 TSO为下行时 隙， 包括 8个或者 9个 OFDM符号。 TS0中每个 OFDM符号包括两部分， 循环前缀部分和数据部分， 数据部分的持续时间均为 66.67us; 其中最后一 个 OFDM符号的与下行时隙 DwPTS之间的间隔为一个 0〜8.33 us之间的固 定值。 将原时隙间隔时间并入到一个或一个以上的 TS0中 OFDM符号的循 环前缀里。 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.

当所述最后一个 OFDM符号与 DwPTS的间隔为 O us时，可以但不限于 将原本 TI的时间并入最后一个 OFDM符号的循环前缀中， 即： 对于 TS0为 短循环前缀的子帧， 最后一个 OFDM符号的循环前缀持续时间为 16.67us， 其它 OFDM符号的循环前缀持续时间为 7.29us; 对于 TS0为长循环前缀的 子帧， 最后一个 OFDM符号的循环前缀持续的时间为 25us， 其它 OFDM符 号的循环前缀持续时间为 16.67us。  When the interval between the last OFDM symbol and the DwPTS is O us , 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, and the cyclic prefix duration of other OFDM symbols is 7.29us; for the subframe where TS0 is a long cyclic prefix, the cyclic prefix of the last OFDM symbol lasts for 25us, other OFDM symbols The cyclic prefix duration is 16.67us.

当所述间隔取为 8.33 us时， 如杲 TS0采用短循环前缀， 则可以但不限 于将多出的 1.05 us并入 TS0最后一个 OFDM符号的循环前缀中。 本发明还提供了一种基于正交频分复用技术的时分双工系统中的基站 , 所述基站用于在下行时隙 DwPTS上发送主同步信道 P-SCH; .其特征在于： 所述基站还用于在 TS0最后一个 OFDM符号上发送 S-SCH信号， 所述最后 一个 OFDM符号与 DwPTS之间的间隔为一个 0〜8.33 us之间的固定值。 将 原时隙间隔时间并入到一个或一个以上的 TS0中 OFDM符号的循环前缀里。 When the interval is taken as 8.33 us, if 杲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 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.

当所述固定值为 0 us时， 可以但不限于将原 TS0最后一个. OFDM符号 与时隙间隔 TI形成一个新的 OFDM符号， 来作为 TS0中最后一个 OFDM 符号。 该新形成的 OFDM符号包括两部分， 循环前缀部分和数据部分。 在 新形成的 OFDM符号中，数据部分持续的时间与 TS0其他 OFDM符号的数 据部分相同，都是 66.67us;对于 TS0为短循环前缀的子帧，新形成的 OFDM 符号的循环前缀持续时间为 16.67us; 对于 TS0为长循环前缀的子帧， 新形 成的 OFDM符号的循环前缀持续的时间为 25us。  When the fixed value is 0 us, 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. 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, 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. For a subframe in which TS0 is a long cyclic prefix, the cyclic prefix of the newly formed OFDM symbol lasts for 25 us.

当所述间隔取为 8.33 us时， 如果 TS0采用短循环前缀， 则可以但不限 于将多出的 1.05 us并入 TS0最后一个 OFDM符号的循环前缀中。  When the interval is taken as 8.33 us, if 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.

从图 3我们可以看出，采用本发明的技术方案后，无论 TS0采用何种长 度的循环前缀， P-SCH和 S-SCH在时间上都是对齐的， 因此， 当移动台利 用 P-SCH完成定时后， 就可以直接提取 S-SCH符号， 无需进行 S-SCH循环 前缀盲检测操作。 同时， 采用优化方案后， 由于 S-SCH符号循环前缀的持 续时间增加了， 这将有利于提高 S-SCH符号在频率选择性衰落信道中的性 能， 并且， 当 TS0和 DwPTS和现有方案相比， S-SCH与 P-SCH相隔更为接 近了， 只相差一个 P-SCH符号的循环前缀的间隔， 而以前相差一个 P-SCH 符号的循环前缀加一个时隙间隔 TI, 因此， P-SCH作为 S-SCH相干解调的 信道估计性能将进一步提高。 It can be seen from FIG. 3 that, after adopting the technical solution of the present invention, 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. At the same time, after the optimization scheme is adopted, since 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 when TS0 and DwPTS are compared with the existing scheme The S-SCH is closer to the P-SCH than the P-SCH, and only the interval of the cyclic prefix of one P-SCH symbol differs, and the cyclic prefix of a P-SCH symbol previously differs by one slot interval TI, therefore, P- The channel estimation performance of SCH as S-SCH coherent demodulation will be further improved.

熟悉本技术领域的人员应理解， 以上所述仅为本发明的较佳实施例， 并 非用来限定本发明的实施范围； 凡是依本发明作等效变化与修改， 都被本发 明的专利范围所涵盖。 It should be understood by those skilled in the art that the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; The scope of the patent is covered by Ming.

工业实用性 Industrial applicability

本发明的技术方案使移动台利用 P-SCH完成定时后， 就可以直接提取 S-SCH符号，因此可以缩短小区搜索时间，并且降低了移动台的实现复杂度。 同时， 优化方案还有利于提高 S-SCH符号在频率选择性衰落信道中的性能， 并且， 使 P-SCH作为 S-SCH相干解调的信道估计性能进一步提高。  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. At the same time, 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.

Claims

权 利 要 求 书 Claim 1、 一种时分双工系统同步信道发送方法，主同步信道 P-SCH在下行时 隙 DwPTS上发送，其特征在于：辅助同步信道 S-SCH在 TS0最后一个正交 频分复用 OFDM符号上发送， 该最后一个 OFDM符号包括循环前缀部分和 数据部分，且该最后一个 OFDM符号的与下行时隙 DwPTS之间的间隔为一 个 0〜8.33 us之间的固定值，其数据部分持续时间与 TS0其他 OFDM符号的 数据部分相同。 A method for transmitting a synchronous channel of a time division duplex system, wherein a primary synchronization channel P-SCH is transmitted on a downlink time slot DwPTS, characterized in that: the secondary synchronization channel S-SCH is on the last OFDM symbol of TS0. Transmit, 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 TS0 The data portions of other OFDM symbols are identical. 2、 根据权利要求 1所述的方法， 其特征在于： 所述固定值为 0 us。 2. Method according to claim 1, characterized in that the fixed value is 0 us. 3、 根据权利要求 2所述的方法， 其特征在于： 3. The method of claim 2, wherein: 对于 TS0为短循环前缀的子帧， 所述最后一个正交频分复用 OFDM符 号的循环前缀持续时间为 16.67us;  For a subframe in which TS0 is a short cyclic prefix, the cyclic prefix duration of the last orthogonal frequency division multiplexing OFDM symbol is 16.67us; 对于 TS0为长循环前缀的子帧， 所述最后一个正交频分复用 OFDM符 号的循环前缀持续的时间为 25us。  For a subframe in which TS0 is a long cyclic prefix, the cyclic prefix of the last orthogonal frequency division multiplexing OFDM symbol lasts for 25 us. 4、 根据权利要求 1 所述的方法， 其特征在于： 所述最后一个正交频分 复用 OFDM符号的数据部分持续时间与 TS0其他 OFDM符号的数据部分相 同， 均是 66.67us。  4. The method according to claim 1, wherein: 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, both being 66.67 us. 5、 一种基于正交频分复用技术的时分双工系统的帧结构， 每个子帧包 括 7个一般时隙以及位于 TS0和 TS1之间的下行时隙 DwPTS、 上下行保护 时隙 GP和上行时隙 UpPTS; TSO中的正交频分复用 OFDM符号包括循环 前缀部分和数据部分， 其特征在于： 该最后一个 OFDM符号与下行时隙 DwPTS之间的间隔为一个 0~8.33 us之间的固定值， 其数据部分持续时间与 TS0其他 OFDM符号的数据部分相同。  5. A frame structure of a time division duplex system based on orthogonal frequency division multiplexing technology, each subframe includes 7 general time slots, a downlink time slot DwPTS between TS0 and TS1, and an uplink and downlink protection time slot GP and The uplink time slot UpPTS; the orthogonal frequency division multiplexing OFDM symbol in the TSO includes a cyclic prefix part and a data part, and is characterized in that: the interval between the last OFDM symbol and the downlink time slot DwPTS is between 0 and 8.33 us The fixed value has the same data portion duration as the data portion of the other OFDM symbols of TS0. 6、 如权利要求 5所述的帧结构， 其特征在于： 所述固定值为 0 us。 6. The frame structure according to claim 5, wherein: the fixed value is 0 us. 7、 如权利要求 6所述的帧结构， 其特征在于： 7. The frame structure of claim 6 wherein: 对于 TS0为短循环前缀的子帧， 所述最后一个正交频分复用 OFDM符 号的循环前缀持续时间为 16.67us;  For a subframe in which TS0 is a short cyclic prefix, the cyclic prefix duration of the last orthogonal frequency division multiplexing OFDM symbol is 16.67us; 对于 TS0为长循环前缀的子帧， 所述最后一个正交频分复用 OFDM符 号的循环前缀持续的时间为 25us。 For a subframe in which TS0 is a long cyclic prefix, the last orthogonal frequency division multiplexing OFDM symbol The cyclic prefix of the number lasts for 25us. 8、 根据权利要求 6所述的帧结构， 其特征在于： 所述最后一个正交频 分复用 OFDM符号的数据部分持续时间与 TS0其他 OFDM符号的数据部分 相同， 均是 66.67us。  8. The frame structure according to claim 6, wherein: 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 both are 66.67 us. 9、 一种基于正交频分复用技术的时分双工系统中的基站， 所述基站用 于在下行时隙 DwPTS上发送主同步信道 P-SCH; 其特征在于： 所述基站还 用于在 TS0最后一个正交频分复用 OFDM符号上发送辅助同步信道 S-SCH; 该最后一个 OFDM符号包括循环前缀部分和数据部分，且该最后一个 OFDM 符号的与下行时隙 DwPTS之间的间隔为一个 0〜8.33 us之间的固定值，其数 据部分持续时间与 TS0其他 OFDM符号的数据部分相同。  A base station in a time division duplex system based on an orthogonal frequency division multiplexing (OFDM) system, the base station is configured to send a primary synchronization channel P-SCH on a downlink time slot DwPTS, and the base station is further configured to: Transmitting a secondary synchronization channel S-SCH on the last Orthogonal Frequency Division Multiplexing OFDM symbol of TS0; the last OFDM symbol includes a cyclic prefix portion and a data portion, and an interval between the last OFDM symbol and a downlink time slot DwPTS It is a fixed value between 0 and 8.33 us, and its data part duration is the same as the data part of other TS0 OFDM symbols. 10、 如权利要求 9所述的基站， 其特征在于： 所述固定值为 0 us。  10. The base station according to claim 9, wherein: the fixed value is 0 us. 11、 一种时分双工系统同步信号发送方法， 主同步信道 P-SCH在下行 时隙 DwPTS上发送， 其特征在于： 辅助同步信道 S-SCH在 TS0最后一个 OFDM符号上发送， 所述 OFDM符号包括两部分， 循环前缀部分和数据部 分； 在该 OFDM符号中， 数据部分持续的时间与 TS0其他 OFDM符号的数 据部分相同， 都是 66.67us; 当 TS0为短循环前缀的子帧时， OFDM符号的 循环前缀持续时间为 16.67us， 或， 当 TS0为长循环前缀的子帧时， OFDM 符号的循环前缀持续的时间为 25us。  A method for transmitting a synchronization signal of 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 OFDM symbol The method 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 the other OFDM symbols of the TS0, and is 66.67us; when the TS0 is a short cyclic prefix subframe, the OFDM symbol The cyclic prefix duration is 16.67us, or, when TS0 is a subframe of a long cyclic prefix, the cyclic prefix of the OFDM symbol lasts for 25us.
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