WO2012142874A1 - 一种无线通信系统中循环前缀类型的指示方法及装置 - Google Patents

一种无线通信系统中循环前缀类型的指示方法及装置 Download PDF

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Publication number
WO2012142874A1
WO2012142874A1 PCT/CN2012/071666 CN2012071666W WO2012142874A1 WO 2012142874 A1 WO2012142874 A1 WO 2012142874A1 CN 2012071666 W CN2012071666 W CN 2012071666W WO 2012142874 A1 WO2012142874 A1 WO 2012142874A1
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type
basic sequence
sequence combination
current
wireless communication
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PCT/CN2012/071666
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English (en)
French (fr)
Inventor
梁春丽
郝鹏
郁光辉
夏树强
鲁照华
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中兴通讯股份有限公司
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Publication of WO2012142874A1 publication Critical patent/WO2012142874A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver only
    • H04L27/2655Synchronisation arrangements
    • H04L27/2666Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2602Signal structure
    • H04L27/2605Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607Cyclic extensions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver only
    • H04L27/2655Synchronisation arrangements
    • H04L27/2689Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2692Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver

Definitions

  • the present invention relates to a Long Term Evolution Local Area Network (LTE-LAN) technology, and in particular to a method and apparatus for indicating a Cyclic Prefix type (CP) in a wireless communication system.
  • LTE-LAN Long Term Evolution Local Area Network
  • CP Cyclic Prefix type
  • LTE-LAN is a wireless communication system used in wireless local area networks. It is based on the time division duplex (TDDD) working mode.
  • the basic frame structure is shown in Figure 1.
  • One basic frame is divided into downlink area and uplink area. And a protection band, wherein the downlink area is used for transmitting downlink signals, and the uplink area is used for transmitting uplink signals.
  • the terminal When the terminal accesses the LTE-LAN system, first, the terminal detects the downlink synchronization channel, and completes signal detection, automatic gain control (AGC, Auto Gain Control) adjustment, CP type judgment, time synchronization, and frequency offset correction; and then, terminal detection
  • the broadcast channel (BCH, Broadcast Channel) obtains system information, and the system information includes configuration information such as the identifier of the base station or the access point (AP, Access Point) and the number of antennas used; finally, the terminal completes uplink time synchronization through the uplink synchronization channel. , complete the entire process of accessing the LTE-LAN system.
  • the downlink synchronization channel and the broadcast channel are located as shown in FIG. 2, and the downlink synchronization channel and the broadcast channel are located in the downlink area of the basic frame, and the width is 20 MHz, and the downlink area further includes other downlink channels.
  • LTE-LAN systems can support multiple CP types to accommodate different channel conditions.
  • One is blind detection, that is, in the access process, the terminal detects the CP type of the synchronization channel by separately trying various CP types for transmission of synchronization information, and the method
  • the advantage is that each channel can select a corresponding CP type according to channel conditions, and the disadvantage is that the detection complexity is high; the other is that the base station notifies the terminal to adopt the currently used CP type in a specific manner.
  • the terminal does not need to perform blind detection.
  • the advantage is that the detection complexity is low.
  • the signals of the received channels need to use the longest CP type, which causes waste of resources. For example, the broadcast channel needs to be fixed. The longest CP type is signaled. Summary of the invention
  • the main object of the present invention is to provide a method and apparatus for indicating a CP type in a wireless communication system, so as to solve the problem of high detection complexity and waste of resources of the existing CP type detection method.
  • the present invention provides a method for indicating a CP type in a wireless communication system.
  • the method includes:
  • the base station uses a basic sequence combination method corresponding to the current CP type, and sends a signal through the downlink synchronization channel to indicate the current CP type.
  • the base station sends a signal to the terminal by using the downlink synchronization channel, and the basic sequence combination mode and the CP type correspondence table of the base station from the pre-acquisition or pre-configuration.
  • the basic sequence combination mode corresponding to the current CP type is queried, and the signal is sent to the terminal on the downlink synchronization channel according to the queried basic sequence combination manner.
  • the method before the base station sends a signal to the terminal by using the downlink synchronization channel, the method further includes: determining, by the base station, the currently adopted CP type according to the channel condition of the current cell. .
  • the basic sequence combination manner is a specified arrangement of a specified number, and/or a specified type of basic sequence.
  • the present invention further provides a CP type indication device in a wireless communication system, the device comprising: an indication unit, configured to send a signal through a downlink synchronization channel to indicate a current CP type by using a basic sequence combination manner corresponding to a current CP type.
  • the indication unit includes: a query module and a sending module;
  • the query module is configured to query a basic sequence combination manner corresponding to the current CP type from a pre-acquisition or pre-configured basic sequence combination manner and a CP type correspondence table;
  • a sending module configured to send a signal to the terminal on the downlink synchronization channel according to the basic sequence combination manner that is queried by the query module, and indicate the current CP type to the terminal.
  • the indication unit further includes: an obtaining module, and/or a configuration module;
  • An obtaining module configured to pre-acquire the correspondence table between the basic sequence combination mode and the CP type
  • a configuration module configured to pre-configure the basic sequence combination mode and the CP type correspondence table
  • the query module is further configured to query a basic sequence combination manner corresponding to the current CP type by using a basic sequence combination manner and a CP type correspondence table pre-acquired from the obtaining module and/or configured by the configuration module.
  • the device further includes: a determining unit, configured to determine, according to a channel condition of the current cell, a currently used CP type;
  • the indication unit is further configured to use a basic sequence combination manner determined by the determining unit to send a signal through a downlink synchronization channel to indicate a current CP type.
  • the method and device for indicating the type of the CP in the wireless communication system of the present invention indicate the CP type by using a basic sequence combination manner when the downlink synchronization channel transmits a signal, so that the terminal can detect the downlink synchronization channel according to the signal of the downlink synchronization channel.
  • the combination of basic sequences is known
  • the CP type has low detection complexity, can improve the detection efficiency of the CP type, and can ensure that all channels can be configured according to their own channel conditions, thereby effectively saving channel resources.
  • 1 is a schematic structural diagram of an LTE-LAN basic frame
  • 2 is a schematic diagram showing the positions of a downlink synchronization channel and a broadcast channel
  • FIG. 3 is a schematic structural diagram of a CP type indicating device in a wireless communication system according to the present invention
  • FIG. 4 is a time-domain waveform diagram of a downlink synchronization channel according to Embodiment 1 of the present invention
  • FIG. 5 is a time-domain waveform diagram of a downlink synchronization channel according to Embodiment 2 of the present invention. detailed description
  • the basic idea of the present invention is:
  • the base station indicates the currently used CP type to the terminal through the combination of the basic sequences in the downlink synchronization channel, so that the terminal can know the combination of the basic sequences in the downlink synchronization channel when detecting the downlink synchronization channel.
  • CP type complete CP type judgment.
  • the method for indicating the type of the CP in the wireless communication system of the present invention mainly includes: the base station adopts a basic sequence combination mode of the pre-CP type, and transmits a signal through the downlink synchronization channel to indicate the CP type.
  • the base station queries the basic sequence combination mode corresponding to the current CP type from the pre-acquisition or pre-configured basic sequence combination mode and the CP type correspondence table, and according to the basic query
  • the sequence combination mode transmits a signal to the terminal on the downlink synchronization channel, and indicates the CP type to the terminal.
  • the basic sequence combination mode and the CP type correspondence table may be pre-configured in the base station, or the basic sequence combination mode and the CP type correspondence table may be pre-configured on other network side devices, and the base station acquires from the network side device.
  • the basic sequence combination method and the CP type correspondence table may be pre-configured in the base station, or the basic sequence combination mode and the CP type correspondence table may be pre-configured on other network side devices, and the base station acquires from the network side device.
  • the downlink synchronization channel is composed of multiple, one or more basic sequences in the time domain.
  • the basic sequence combination may be a specified number, and/or a specified arrangement of the specified type of base sequence.
  • the basic sequence combination may be one or more of seven in the following Table 1, wherein the basic sequence A and the basic sequence B are respectively specified two basic sequences, and -A represents the basic sequence A.
  • One phase rotation that is, the basic sequence obtained after the basic sequence A phase is rotated
  • -B represents a phase rotation to the basic sequence B, that is, the basic sequence B phase rotation
  • the basic sequence phase obtained after ⁇ is composed of multiple, one or more basic sequences in the time domain.
  • the basic sequence combination may be a specified number, and/or a specified arrangement of the specified type of base sequence.
  • the basic sequence combination may be one or more of seven in the following Table 1, wherein the basic sequence A and the basic sequence B are respectively specified two basic sequences, and -A represents the basic sequence A.
  • One phase rotation that is, the
  • the basic sequence combination number numbered 1 is a specified arrangement pattern for specifying 10 specified basic sequences
  • the basic sequence combination number numbered 6 is 10, which specifies the basic sequence A and the basic sequence B.
  • the time base duration of the specified basic sequence A, and/or the specified basic sequence B may be 0.4us, or 0.8us, or 1.6uS o
  • the base station obtains or configures the basic sequence combination mode and the CP type in advance - the corresponding basic sequence combination mode and the CP type correspondence table.
  • the base station can adopt the basic sequence combination mode corresponding to the CP type 1. 1 .
  • the signal is sent on the downlink synchronization channel.
  • the base station can transmit the signal on the downlink synchronization channel in the basic sequence combination mode 2 corresponding to the CP type 2; when the CP type M is currently used, the base station can respond
  • the basic sequence combination mode M of the CP type M transmits a signal on the downlink synchronization channel, where M represents the number of types of the CP type.
  • the method further includes: determining, by the base station, the currently adopted CP type according to the channel condition of the current cell.
  • the channel condition of the cell may include parameters such as a delay extension of the channel.
  • the present invention further provides a device for indicating a CP type in a wireless communication system. As shown in FIG. 3, the device includes: an indication unit 11 configured to adopt a basic sequence combination method corresponding to a current CP type, and The synchronization channel sends a signal indicating the current CP type.
  • the indication unit 11 includes: a query module 111 and a sending module 112.
  • the query module 111 is configured to query a current CP type from a basic sequence combination manner and a CP type correspondence table obtained in advance or pre-configured.
  • the sending module 112 is configured to send a signal to the terminal on the downlink synchronization channel according to the basic sequence combination manner that is queried by the query module 111, and indicate the current CP type to the terminal.
  • the indication unit 111 may further include: an obtaining module 113, and/or a configuration module 114.
  • the obtaining module 113 is configured to acquire the basic sequence combination mode and the CP type correspondence relationship table in advance; the configuration module 114, The basic sequence combination mode and the CP type correspondence table are pre-configured; the query module 111 is further configured to use the basic sequence combination manner pre-configured from the obtaining module 113 and/or configured by the configuration module 114.
  • the query corresponds to the basic sequence combination mode of the current CP type.
  • the obtaining module 113 may obtain the basic sequence combination mode and the CP type correspondence table from the network side device that stores the basic sequence combination mode and the CP type correspondence table.
  • the device may further include: a determining unit 12, configured to determine, according to a channel condition of the current cell, a currently adopted CP type.
  • the indicating unit 11 is further configured to use a basic sequence combination manner determined by the determining unit 12 to send a signal through a downlink synchronization channel to indicate a current CP type.
  • three types of CPs are represented by three combinations of ten base station sequences A.
  • the basic sequence combination mode one ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , corresponds to CP type 1;
  • basic sequence combination mode 2 A, -A , A, -A, A, -A, A, -A, A, -A, right CP type 2;
  • basic sequence combination mode three A, -A, A, -A, -A, A, -A, A, -A, -A, indicating CP type 3, where the duration of the basic sequence A For 0.8us, the synchronization signal consisting of 10 basic sequences A has a duration of 8 us.
  • the process of the base station indicating the CP type to the terminal may include the following steps: Step 1: Pre-configure a correspondence table between the three combinations of the ten base station sequences A and the three CP types in the base station;
  • Step 2 The base station configures the CP type of each channel according to the channel conditions of each channel.
  • Step 3 When the signal needs to be sent through the downlink synchronization channel, the base station queries the basic sequence combination corresponding to the CP type according to the currently configured CP type. And using the queried basic sequence combination form, the signal is sent on the downlink synchronization channel.
  • the base station queries that the corresponding basic sequence combination form is the basic sequence combination form 3 described above, and then uses the basic sequence combination form 3 to send a signal on the downlink synchronization channel.
  • the terminal parses the downlink synchronization channel signal, and obtains a basic sequence combination form in the downlink synchronization channel signal, from a pre-acquired or pre-configured basic sequence combination manner and a CP type.
  • a basic sequence combination form in the downlink synchronization channel signal from a pre-acquired or pre-configured basic sequence combination manner and a CP type.
  • the terminal may obtain the basic sequence combination mode and the CP type correspondence relationship table from the base station, or may obtain the other network side device that stores the basic sequence combination mode and the CP type correspondence relationship table, or may also obtain The basic sequence combination mode and the CP type correspondence table are directly configured on the terminal.
  • three types of CPs are represented by three basic sequences of base station sequence A and basic sequence B, and three combinations of a total of ten basic sequences.
  • the synchronization signal consisting of the basic sequence B has a duration of 8 us.
  • -A is the basic sequence after the phase rotation of the basic sequence A
  • -B is the basic sequence after the phase rotation of the basic sequence B.
  • the process of performing the CP type indication may include the following steps: Step 1: The base station acquires a correspondence table between the three basic sequence combinations of the ten base station sequences A and the three CP types;
  • Step 2-3 The same as step 2-3 in the first embodiment, except that when the base station transmits a signal on the downlink synchronization channel, the basic sequence combination manner adopted from the three basic sequence combinations shown in FIG. The query is obtained from the correspondence table of the three CP types.

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Abstract

本发明公开了一种无线通信系统中CP类型的指示方法,所述方法包括:基站采用对应当前CP类型的基本序列组合方式,通过下行同步信道发送信号,指示当前CP类型。本发明还公开了一种无线通信系统中CP类型的指示装置,通过下行同步信道发送信号时所采用的基本序列组合方式指示CP类型,使得终端能够在检测下行同步信道时,根据下行同步信道的信号中基本序列的组合方式获知CP类型,检测复杂度低,能够提高CP类型的检测效率,并且可以保证所有信道都可以根据自身信道条件配置对应的CP类型,从而有效节省信道资源。

Description

一种无线通信系统中循环前缀类型的指示方法及装置 技术领域
本发明涉及长期演进局域网 ( LTE- LAN , Advanced Long-Term Evolution Local Area Network )技术,尤其涉及一种无线通信系统中循环前 缀 ( CP, Cyclic Prefix )类型的指示方法及装置。 背景技术
LTE-LAN是应用于无线局域网中的一种无线通信系统, 基于时分双工 ( TDD, Time Division Duplex )工作模式, 其基本帧结构如图 1所示, 一 个基本帧分为下行区、 上行区和保护带, 其中, 下行区用于传输下行信号, 上行区用于传输上行信号。
终端接入 LTE-LAN系统时, 首先, 终端检测下行同步信道, 完成信号 检测、 自动增益控制 (AGC, Auto Gain Control )调整、 CP类型判断、 时 间同步以及频偏校正等工作; 然后, 终端检测广播信道(BCH, Broadcast Channel ), 获得系统信息, 系统信息包括基站或接入点( AP, Access Point ) 的标识、 所使用天线数等配置信息; 最后, 终端通过上行同步信道完成上 行的时间同步, 完成接入 LTE-LAN系统的全部过程。 其中, 下行同步信道 和广播信道的位置如图 2所示, 下行同步信道和广播信道位于基本帧的下 行区, 宽度为 20MHz, 下行区还包含有其他下行信道。
LTE-LAN系统可以支持多种 CP类型, 以适应不同的信道条件。 目前, 现有的 CP类型检测有两种方法: 一种是盲检测, 即在接入过程中, 终端通 过分别尝试各种 CP类型进行同步信息的传输, 检测同步信道的 CP类型, 该方法的优点是各信道可以根据信道条件选择相应的 CP类型,缺点是检测 复杂度较高; 另一种是基站通过特定的方式通知终端当前采用的 CP类型, 不需要终端进行盲检测, 优点是检测复杂度低, 但在获得 CP类型之前, 所 接收各信道的信号都需要使用最长的 CP类型, 会造成资源的浪费, 例如, 广播信道就需要固定使用最长的 CP类型进行信号发送。 发明内容
有鉴于此,本发明的主要目的在于提供一种无线通信系统中 CP类型的 指示方法及装置, 以解决现有的 CP类型检测方法检测复杂度高、 以及资源 浪费的问题。
为达到上述目的, 本发明的技术方案是这样实现的:
本发明提供了一种无线通信系统中 CP 类型的指示方法, 所述方法包 括: 基站采用对应当前 CP类型的基本序列组合方式, 通过下行同步信道发 送信号, 指示当前 CP类型。
在上述方案中, 所述基站采用对应当前 CP类型的基本序列组合方式, 通过下行同步信道向终端发送信号, 包括: 所述基站从预先获取或预先配 置的基本序列组合方式与 CP类型对应关系表中, 查询对应当前 CP类型的 基本序列组合方式, 并按照所查询到的基本序列组合方式在下行同步信道 向终端发送信号。
在上述方案中, 在所述基站采用对应当前 CP 类型的基本序列组合方 式, 通过下行同步信道向终端发送信号之前, 所述方法还包括: 基站根据 当前小区的信道条件, 确定当前采用的 CP类型。
在上述方案中, 所述基本序列组合方式为指定数量、 和 /或指定种类基 本序列的指定排列方式。
本发明还提供了一种无线通信系统中 CP类型的指示装置,所述装置包 括: 指示单元, 用于采用对应当前 CP类型的基本序列组合方式, 通过下行 同步信道发送信号, 指示当前 CP类型。
在上述方案中, 所述指示单元, 包括: 查询模块和发送模块; 其中, 查询模块,用于从预先获取或预先配置的基本序列组合方式与 CP类型 对应关系表中, 查询对应当前 CP类型的基本序列组合方式;
发送模块, 用于按照所述查询模块查询到的基本序列组合方式在下行 同步信道向终端发送信号, 向所述终端指示当前 CP类型。
在上述方案中, 所述指示单元, 还包括: 获取模块、 和 /或配置模块; 其中,
获取模块, 用于预先获取所述基本序列组合方式与 CP 类型对应关系 表;
配置模块, 用于预先配置所述基本序列组合方式与 CP 类型对应关系 表;
所述查询模块, 还用于从所述获取模块预先获取的、 和 /或配置模块预 先配置的基本序列组合方式与 CP类型对应关系表, 查询对应当前 CP类型 的基本序列组合方式。
在上述方案中, 所述装置还包括: 确定单元, 用于根据当前小区的信 道条件, 确定当前采用的 CP类型;
所述指示单元, 还用于采用所述确定单元确定的基本序列组合方式, 通过下行同步信道发送信号, 指示当前 CP类型。
本发明的无线通信系统中 CP类型的指示方法及装置,通过下行同步信 道发送信号时所采用的基本序列组合方式指示 CP类型,使得终端能够在检 测下行同步信道时, 根据下行同步信道的信号中基本序列的组合方式获知
CP类型, 检测复杂度低, 能够提高 CP类型的检测效率, 并且可以保证所 有信道都可以根据自身信道条件配置对应的 CP类型,从而有效节省信道资 源。 附图说明
图 1为 LTE-LAN基本帧的结构示意图; 图 2为下行同步信道和广播信道的位置示意图;
图 3为本发明无线通信系统中 CP类型指示装置的组成结构示意图; 图 4为本发明实施例一的下行同步信道时域波形图;
图 5为本发明实施例二的下行同步信道时域波形图。 具体实施方式
本发明的基本思想是: 基站通过下行同步信道中基本序列的组合方式, 向终端指示当前所采用的 CP类型, 使得终端能够在检测下行同步信道时, 根据下行同步信道中基本序列的组合方式获知 CP类型 ,完成 CP类型判断。
本发明的无线通信系统中 CP类型的指示方法, 主要包括: 基站采用对 应当前 CP 类型的基本序列组合方式, 通过下行同步信道发送信号, 指示 CP类型。
具体地, 需要通过下行同步信道发送信号时, 基站从预先获取或预先 配置的基本序列组合方式与 CP类型对应关系表中, 查询对应当前 CP类型 的基本序列组合方式, 并按照所查询到的基本序列组合方式在下行同步信 道向终端发送信号, 向所述终端指示 CP类型。
这里, 基本序列组合方式与 CP类型对应关系表可以预先配置在基站, 或者也可以将基本序列组合方式与 CP 类型对应关系表预先配置在其他的 网络侧设备上,基站从所述网络侧设备获取基本序列组合方式与 CP类型对 应关系表。
实际应用中, 下行同步信道在时域上由多个、 一种或多种基本序列组 成。 所述基本序列组合方式可以是指定数量、 和 /或指定种类基本序列的指 定排列方式。 例如, 所述基本序列组合方式可以是以下表 1 中七种之中的 一种或多种,其中,基本序列 A和基本序列 B分别为指定的两种基本序列, -A表示对基本序列 A的一个相位旋转, 即基本序列 A相位旋转 后得到的 基本序列, -B表示对基本序列 B的一个相位旋转, 即基本序列 B相位旋转 τ后得到的基本序列相位。 例如, 编号为 1 的基本序列组合方式为指定 10 个指定基本序列 Α的一种指定排列方式, 编号为 6的基本序列组合方式为 指定 10个、 指定基本序列 A和基本序列 B的、 一种指定排列方式。 这里, 指定的基本序列 A、 和 /或指定的基本序列 B的时域持续时间可以是 0.4us、 或 0.8us、 或 1.6uS o
Figure imgf000007_0001
表 1
例如,基站预先获得或配置基本序列组合方式和 CP类型是——对应的 基本序列组合方式与 CP类型对应关系表, 在当前使用 CP类型 1时, 基站 可以以对应 CP类型 1的基本序列组合方式 1 , 在下行同步信道发送信号; 在当前使用 CP类型 2时, 基站可以以对应 CP类型 2的基本序列组合方式 2, 在下行同步信道发送信号; 在当前使用 CP类型 M时, 基站可以以对应 CP类型 M的基本序列组合方式 M, 在下行同步信道发送信号, 其中, M 表示 CP类型的种类数。
这里, 在所述基站采用对应当前 CP类型的基本序列组合方式, 通过下 行同步信道向终端发送信号之前, 所述方法还包括: 基站根据当前小区的 信道条件, 确定当前采用的 CP类型。 其中, 所述小区的信道条件可以包括 信道的时延扩展等参数。 相应的, 本发明还提供了一种无线通信系统中 CP类型的指示装置, 如 图 3所示, 所述装置包括: 指示单元 11 , 用于采用对应当前 CP类型的基 本序列组合方式, 通过下行同步信道发送信号, 指示当前 CP类型。
这里, 所述指示单元 11 , 包括: 查询模块 111和发送模块 112; 其中, 查询模块 111 , 用于从预先获取或预先配置的基本序列组合方式与 CP类型 对应关系表中,查询对应当前 CP类型的基本序列组合方式;发送模块 112, 用于按照所述查询模块 111 查询到的基本序列组合方式在下行同步信道向 终端发送信号, 向所述终端指示当前 CP类型。
这里, 所述指示单元 111 还可以包括: 获取模块 113、 和 /或配置模块 114; 其中, 获取模块 113 , 用于预先获取所述基本序列组合方式与 CP类 型对应关系表; 配置模块 114, 用于预先配置所述基本序列组合方式与 CP 类型对应关系表; 所述查询模块 111 , 还用于从所述获取模块 113预先获取 的、 和 /或配置模块 114预先配置的所述基本序列组合方式与 CP类型对应 关系表中, 查询对应当前 CP类型的基本序列组合方式。
实际应用中, 获取模块 113可以从存储有所述基本序列组合方式与 CP 类型对应关系表的网络侧设备上,获取所述基本序列组合方式与 CP类型对 应关系表。
此外, 所述装置还可以包括: 确定单元 12, 用于根据当前小区的信道 条件, 确定当前采用的 CP类型。 这里, 所述指示单元 11 , 还用于采用所 述确定单元 12确定的基本序列组合方式, 通过下行同步信道发送信号, 指 示当前 CP类型。
实施例一
本实施例中, 通过 10个基站序列 A的 3种组合方式, 表示 3种 CP类 型。具体地,如图 4所示,基本序列组合方式一: Α, Α, Α, Α, Α, Α, Α, Α, Α, Α, 对应 CP类型 1; 基本序列组合方式二: A, -A, A, -A, A, -A, A, -A, A, -A, 对 应 CP类型 2; 基本序列组合方式三: A, -A, A, -A, -A, A, -A, A, -A, -A, 表 示 CP类型 3 , 其中, 基本序列 A的持续时间为 0.8us, 由 10个基本序列 A 组成的同步信号持续时间为 8 us。
本实施例中 ,基站向终端指示 CP类型的过程,具体可以包括以下步驟: 步驟 1 : 预先在基站配置上述 10个基站序列 A的 3种组合方式与 3种 CP类型的对应关系表;
步驟 2: 基站根据各信道的信道条件, 配置各信道的 CP类型; 步驟 3: 需要通过下行同步信道发送信号时, 基站根据当前配置的 CP 类型, 查询所述 CP类型对应的基本序列组合形式, 并采用所查询到的基本 序列组合形式, 在下行同步信道发送信号。
例如, 如果基站配置的 CP类型为 CP类型 3 , 则基站查询到对应的基 本序列组合形式为上述的基本序列组合形式三, 则采用上述的基本序列组 合形式三在下行同步信道发送信号。
如此, 终端可以接收到所述下行同步信道信号之后, 解析所述下行同 步信道信号, 得到所述下行同步信道信号中的基本序列组合形式, 从预先 获取或预先配置的基本序列组合方式与 CP类型对应关系表,查询所述下行 同步信道信号中基本序列组合形式对应的 CP类型, 得到下行同步信道的 CP类型。 实际应用中, 终端可以从基站获取所述基本序列组合方式与 CP 类型对应关系表,或者也可以从存储有所述基本序列组合方式与 CP类型对 应关系表的其他网络侧设备获取, 或者还可以直接在所述终端上配置所述 基本序列组合方式与 CP类型对应关系表。
实施例二
本实施例中, 通过基站序列 A和基本序列 B两种基本序列、 以及总共 10个基本序列的 3种组合方式, 表示 3种 CP类型。
具体地,如图 5所示,基本序列组合方式一: A, A, A, A, A, A, A, A, A, -A, 表示 CP类型 1 ; 基本序列组合方式二: Α,-Α,Α,-Α,-Α, Β,Β, Β,Β,-Β, 表示 CP类型 2; 基本序列组合方式三: A, A, A, A, -A, B, B, B, B, -B, 表示 CP 类型 3 , 其中, 基本序列 A和基本序列 B的持续时间均为 0.8us, 由 10个、 基本序列 A和 /或基本序列 B组成的同步信号持续时间为 8 us。其中, -A为 基本序列 A相位旋转 后的基本序列, -B为基本序列 B相位旋转 后的基 本序列。
本实施例中, 进行 CP类型指示的过程, 具体可以包括以下步驟: 步驟 1 : 基站获取上述 10个基站序列 A的 3种基本序列组合方式与 3 种 CP类型的对应关系表;
步驟 2-3: 与实施例一中的步驟 2-3相同, 所不同的是, 基站在下行同 步信道上发送信号时, 所采用的基本序列组合方式从图 5所示 3种基本序 列组合方式与 3种 CP类型的对应关系表中查询得到。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种无线通信系统中循环前缀 CP类型的指示方法, 其特征在于, 所述方法包括:
基站采用对应当前 CP类型的基本序列组合方式,通过下行同步信道发 送信号, 指示当前 CP类型。
2、 根据权利要求 1所述无线通信系统中 CP类型的指示方法, 其特征 在于, 所述基站采用对应当前 CP类型的基本序列组合方式, 通过下行同步 信道向终端发送信号, 包括:
所述基站从预先获取或预先配置的基本序列组合方式与 CP 类型对应 关系表中, 查询对应当前 CP类型的基本序列组合方式, 并按照所查询到的 基本序列组合方式在下行同步信道向终端发送信号。
3、 根据权利要求 1所述无线通信系统中 CP类型的指示方法, 其特征 在于, 在所述基站采用对应当前 CP类型的基本序列组合方式, 通过下行同 步信道向终端发送信号之前, 所述方法还包括: 基站根据当前小区的信道 条件, 确定当前采用的 CP类型。
4、 根据权利要求 1至 3任一项所述无线通信系统中 CP类型的指示方 法, 其特征在于, 所述基本序列组合方式为指定数量、 和 /或指定种类基本 序列的指定排列方式。
5、 一种无线通信系统中 CP类型的指示装置, 其特征在于, 所述装置 包括: 指示单元, 用于采用对应当前 CP类型的基本序列组合方式, 通过下 行同步信道发送信号, 指示当前 CP类型。
6、 根据权利要求 5所述无线通信系统中 CP类型的指示装置, 其特征 在于, 所述指示单元, 包括: 查询模块和发送模块; 其中,
查询模块,用于从预先获取或预先配置的基本序列组合方式与 CP类型 对应关系表中, 查询对应当前 CP类型的基本序列组合方式; 发送模块, 用于按照所述查询模块查询到的基本序列组合方式在下行 同步信道向终端发送信号, 向所述终端指示当前 CP类型。
7、 根据权利要求 6所述无线通信系统中 CP类型的指示装置, 其特征 在于, 所述指示单元, 还包括: 获取模块、 和 /或配置模块; 其中,
获取模块, 用于预先获取所述基本序列组合方式与 CP 类型对应关系 表;
配置模块, 用于预先配置所述基本序列组合方式与 CP 类型对应关系 表;
所述查询模块, 还用于从所述获取模块预先获取的、 和 /或配置模块预 先配置的基本序列组合方式与 CP类型对应关系表, 查询对应当前 CP类型 的基本序列组合方式。
8、 根据权利要求 5至 7任一项所述无线通信系统中 CP类型的指示装 置, 其特征在于, 所述装置还包括: 确定单元, 用于根据当前小区的信道 条件, 确定当前采用的 CP类型;
所述指示单元, 还用于采用所述确定单元确定的基本序列组合方式, 通过下行同步信道发送信号, 指示当前 CP类型。
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