WO2009143710A1 - 一种波束赋型传输的方法、系统及装置 - Google Patents

一种波束赋型传输的方法、系统及装置 Download PDF

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Publication number
WO2009143710A1
WO2009143710A1 PCT/CN2009/000594 CN2009000594W WO2009143710A1 WO 2009143710 A1 WO2009143710 A1 WO 2009143710A1 CN 2009000594 W CN2009000594 W CN 2009000594W WO 2009143710 A1 WO2009143710 A1 WO 2009143710A1
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Prior art keywords
dwpts
user
specific reference
base station
data
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PCT/CN2009/000594
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English (en)
French (fr)
Inventor
林亚男
索士强
丁昱
肖国军
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大唐移动通信设备有限公司
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Application filed by 大唐移动通信设备有限公司 filed Critical 大唐移动通信设备有限公司
Priority to JP2011510807A priority Critical patent/JP5113939B2/ja
Priority to EP17163627.7A priority patent/EP3206307B1/en
Priority to US12/995,060 priority patent/US8526295B2/en
Priority to EP09753428.3A priority patent/EP2290836B1/en
Priority to MX2010013096A priority patent/MX2010013096A/es
Publication of WO2009143710A1 publication Critical patent/WO2009143710A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24Cell structures
    • H04W16/28Cell structures using beam steering
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation

Definitions

  • a beamforming transmission method, system and equipment A beamforming transmission method, system and equipment.
  • the present invention relates to the field of mobile communications, and in particular to the field of mobile communication multi-antenna technology. Background technique
  • the multi-antenna technology of the physical layer has become the key to the next-generation wireless communication system: one of the technologies, the multi-antenna technology has many advantages, such as using the multiplexing gain of multiple antennas to expand the throughput of the system, and using the diversity gain of multiple antennas to improve System performance, using the directional gain of the antenna to distinguish the user from the interference between users and so on.
  • the UTE (Long T1 ⁇ 2mi Evokition, Long Term Evolution) system in 3GPP (3rd Generation Partnership Project) supports multiple MIMO (Multiple-Input Multiple-), such as transmit diversity, spatial multiplexing, and beamforming. Output, multiple input and multiple output technology.
  • the ⁇ structure of FDD (Frequency Division Duplex) and TDD (Time Division Duplex) in LTE adopts the sub- ⁇ (Subfraine) structure of 1ms, which is shown in Figure 1.
  • Shown as a schematic diagram of the TD.D frame structure a half-frame of each TDD radio frame is composed of 5 subframes, each pre-frame is 1 ms, and each subframe is composed of two subframes. 0.5 s S ot constitutes.
  • each field includes four 1 long subframes (Subframes) and three special time slots (Special Slots): DwPTS, GP, and UpPTS, three special time slots.
  • the total length is i ms.
  • the first half includes four 1 ms long child anger and three special bead slots: DwPTS, GP and UpPTS; the second half only has 5 1 ms long Child #1.
  • the length of the special time slot DwPTS is determined by the configuration type and the sub-10 and the sub-frame 5 and the DwPTS are reserved for the downlink transmission as shown in the group 2, which is the schematic group of the DwPTS time slot, and the first in the DwPTS time slot.
  • Downlink control signaling is transmitted in the first or second OFDM (Orthogonal Frequency Division Multiplexing) symbol, and 72 central subcarriers on the third OFDM symbol are always used for transmitting the cell.
  • Search cell Search
  • any downlink traffic number can occupy idle resources on the read time slot for transmission, for example, carrying the physical downlink shared channel PDSCH, physical multicast channel? (1.
  • the LTE system has the following provisions for downlink beamforming transmission:
  • the beamforming user demodulates the physical downlink shared service channel PDSCH by using UE-specific reference signals
  • the user-specific reference signal is only shot in the resource block using the shaped transmission
  • the user-specific reference signal occupies only one antenna port, that is, the antenna port 5;
  • the upper layer needs to inform the terminal whether the user-specific reference signal is used, that is, whether to perform beamforming transmission;
  • the cell-specific reference signals on the port 0, i are reserved, and the cell-specific reference signals on the ports 2 and 3 are no longer used.
  • the special time slot DwPTS can also support the downlink beamforming transmission.
  • the mapping of the user-specific reference signal during the wave shaping transmission in the normal service sub-segment is given.
  • ⁇ 3 ⁇ 4 performs beamforming transmission in the special time slot DwPTS, the mapping pattern of the user-specific reference signal is not defined.
  • the problem to be solved by the present invention is to propose a method, system and device for Bodong-type transmission, which solves the problem of beamforming transmission in a special time slot DwPTS.
  • the present invention discloses a beam-forming transmission method, which comprises the following steps:
  • the base station will carry the downlink service number of the user that needs beamforming transmission in the DwPTS time slot and the user-specific reference signal. Mapping according to a predetermined mapping structure, and performing a Bodong shaping process; the base station performs resource block shooting on the shaping processing node, the primary synchronization signal, the control signaling, the cell-specific reference signal, and other user data to form the DwPTS time slot data; the base station transmits the DwPTS time slot data to the terminal.
  • a method for beamforming transmission in which a terminal receives DwPTS time slot data sent by a base station, where the DwPTS time slot data includes a shaping processing result, a primary synchronization signal, a control signaling, and a cell.
  • the dedicated reference signal and other user numbers are determined by the following manner: The base station will carry the beamforming transmission in the DwPTS slot. i , and ⁇ type processing
  • Another aspect of the invention also provides a beamforming transmission system, including! a station and at least one terminal, the base station, configured to map downlink service data and user-specific reference signals of users that need to transmit in the DwPTS time slot according to a predetermined mapping structure, and perform Bodon shaping processing And mapping the result of the shaping process, the primary synchronization signal, the control signaling, the cell-specific reference signal, and other user data to form the DwPTS slot number ⁇ ; the terminal, configured to receive the DwPTS time slot Counting.
  • Another aspect of the present invention further provides a base station, including a data processing module and a transmitting module, and a data processing module, configured to carry downlink service data and a user-specific reference signal of a user that needs to be beamformed and transmitted in a DwPTS time slot.
  • a base station including a data processing module and a transmitting module, and a data processing module, configured to carry downlink service data and a user-specific reference signal of a user that needs to be beamformed and transmitted in a DwPTS time slot.
  • the DwPTS time slot data is transmitted to the terminal.
  • the technical solution of the present invention does not additionally add a user-specific reference signal mapping structure, and the beam-forming type transmission in the special time slot DwPTS can be realized by using the technical method of the present invention. Improve system performance without introducing a new user-specific reference signal mapping structure to achieve a single order.
  • FIG. 1 is a schematic diagram of a TDD frame structure
  • FIG. 2 is a schematic diagram of a DwPTS slot
  • 3 is a flow chart of a method for implementing beamforming
  • Figure 5 is a user-specific reference signal mapping structure
  • 6 is a mapping structure of different configurations of DwPTS slots of a Normal CP
  • Figure 7 shows the mapping structure of different configurations of the DwPTS slot of the Extended CP
  • Figure 8 is a functional block diagram of the system for beamforming transmission. Concrete real way
  • the present invention mainly provides a beamforming transmission method, system and device for performing beamforming transmission in a special time slot DwPTS.
  • the technical solution of the invention can not only improve the system performance, but also introduce a new user-specific reference signal mapping structure, and the implementation is simple.
  • the present invention provides a beamforming transmission method, comprising the following steps: The base station according to a predetermined downlink data and a user-specific reference signal of a user carrying a beamforming transmission in a DwPTS time slot. Mapping the structure mapping, and performing beamforming processing; the base station performs resource mapping on the shaping processing result, the primary synchronization signal, the control signaling, the cell-specific reference signal, and other user data to form the DwPTS time slot data; The base station sends the DwPTS slot data to a terminal.
  • a flowchart for implementing a beamforming method includes the following steps:
  • Step A The user data and the user-specific reference signal that are required to be beam-formed in the DwPTS slot are mapped according to a predetermined mapping structure, and beamforming processing is performed.
  • the predetermined mapping structure depends on the number of OFDM symbols carried in the DwPTS slot, and the difference in the number of OFDM symbols carried has a different mapping structure.
  • the number of OFDM symbols carried in the DwPTS slot depends on the type of the cyclic prefix CP of the OFDM symbol and the specific configuration of the DwPTS slot.
  • mapping according to a predetermined mapping structure includes the following steps:
  • the base station determines the user-specific reference signal mapping structure according to the type of the cyclic prefix CP; the base station destroys the nth and subsequent OFDM symbols in the user-specific reference signal mapping structure, and only retains the first n OFDM symbols in the user-specific reference signal mapping structure.
  • the base station on the physical resource block allocated to the user, the downlink service data and the user-specific reference letter The number is mapped according to the predetermined mapping structure.
  • Step B Perform mapping processing on the processing result of the shaping process, the main synchronization signal, the control signaling, the cell-specific reference signal, and other user data to form DwPTS time slot data.
  • step B DwPTS slot data conforming to the transport format will be formed.
  • control signaling is transmitted on a first or first second OFDM symbol in a DwPTS slot, the primary synchronization signal being at the center of a third OFDM symbol in the DwPTS slot Transmission on 72 subcarriers.
  • Step C sending DwPTS slot data.
  • the base station transmits DwPTS slot data that can be beamformed on the DwPTS slot to the terminal. Accordingly, the terminal receives data of a DwPTS slot having a beamforming transmission characteristic transmitted by the base station.
  • another aspect of the present invention provides a method for beamforming transmission, in which a terminal receives DwPTS time slot data sent by a base station, where the DwPTS time slot data includes a shaping processing result, a primary synchronization signal, and a control signal.
  • the cell-specific reference signal and other user data, the result of the shaping process is determined by: the base station carrying downlink service data and user-specific reference signals of users requiring beamforming transmission in the DwPTS time slot
  • the mapping is mapped according to a predetermined mapping structure, and beamforming processing is performed.
  • the predetermined mapping structure in the DwPTS slot data received by the terminal depends on the number of OFDM symbols carried in the DwPTS slot.
  • implementing the predetermined mapping structure mapping in the DwPTS slot data received by the terminal includes the following steps:
  • the base station determines the user-specific reference signal mapping structure according to the type of the cyclic prefix CP; the base station destroys the nth and subsequent OFDM symbols in the user-specific reference signal mapping structure, and only retains the first n OFDM symbols in the user-specific reference signal mapping structure. , as a predetermined mapping structure; The base station maps the downlink service data and the user-specific reference signal according to the predetermined mapping structure on the physical resource block allocated to the user.
  • the control signaling in the DwPTS slot data received by the terminal is transmitted on the first or first second OFDM symbol in the DwPTS slot, and the primary synchronization signal is the third in the DwPTS slot.
  • the OFDM symbols are transmitted on the center 72 subcarriers.
  • the beamforming transmission method of this embodiment specifically includes the following processes:
  • each OFDM symbol in a normal Normal CP subframe has a length of 2192 Ts, and a total of 14 OFDM symbols are included in the entire subframe.
  • Extended Extended CP Each OFDM symbol in the subframe has a length of 2560 Ts, and a total of 12 OFDM symbols are included in the entire subframe.
  • the DwPTS slot may carry 3, 9, 10, 11, and 12 OFDM symbols, and there are five different cases; for a subframe carrying the Extended CP, The DwPTS slot may carry 3, 8, 9, 10 OFDM symbols, and there are four different cases.
  • downlink control signaling is transmitted in the first or first second OFDM symbol in the DwPTS slot, and 72 central subcarriers on the third OFDM symbol are always used for transmission.
  • Primary sync signal for Cell Search Except for the broadcast channel PBCH, any downlink service data can occupy idle resources on the time slot for transmission, for example, carrying a physical downlink shared channel PDSCH, a physical multicast channel PMCH, and the like.
  • the base station first needs to determine the format of the transmission frame, and determine whether the CP of the OFDM symbol carried by the current DwPTS slot is of the Normal type or the Extended type, because different CP types,
  • the configuration of DwPTS slots is different.
  • S102 Determine a configuration of a DwPTS slot.
  • the base station determines the number of OFDM symbols carried in the DwPTS slot for different CP types.
  • the base station can determine the length T of the DwPTS slot and the length To of one OFDM symbol, so that the base station can obtain the DwPTS slot bearer.
  • the number of OFDM symbols n, where n T/To.
  • Base station The downlink service data and the user-specific reference signal of the user that needs to be beam-formed in the DwPTS slot are mapped according to a predetermined mapping structure, and beamforming processing is performed.
  • the configuration of the DwPTS time slot should not be limited to the mode of Table 1 in this embodiment, and various adjustments can be made to the configuration parameters of the DwPTS time slot, and the change should be the protection scope of the present invention. Covered.
  • the beamforming transmission is performed on the special time slot DwPTS, that is, the base station maps the downlink service data of the user that needs to be beamformed and transmitted in the DwPTS time slot and the user-specific reference signal according to a predetermined mapping structure, and performs beamforming processing.
  • the base station After S101, the base station has determined the type of the cyclic prefix CP of the OFDM symbol in the DwPTS slot.
  • there are mapping structures of different user-specific reference signals where the mapping structure of the user-specific reference signals is used when the user performs beamforming transmission in a normal service subframe.
  • the user-specific reference signal mapping structure used.
  • the left picture A is the user-specific reference signal mapping structure of the Normal CP
  • the right picture B is the user-specific reference signal mapping structure of the Extended CP. Since the cell-specific reference signal is transmitted in each downlink subframe, the entire system bandwidth is covered in the frequency domain, and the entire downlink subframe is spanned in time.
  • the block portion of the grid in the figure indicates the cell-specific reference on the port 0, 1. signal.
  • the user-specific reference signal is only used in the data portion of the physical resource block allocated to the user for beamforming, and when it is present in one subframe at the same time as the cell-specific reference signal, it will be multiplexed in the manner shown in FIG. It represents the user-specific reference signal.
  • the base station can determine the mapping structure of the user-specific reference signal based on the type of the cyclic prefix CP.
  • the base station determines and determines the number n of OFDM symbols.
  • the base station cancels the nth and subsequent OFDM symbols in the user-specific reference signal mapping structure, and only retains the first n OFDM symbols in the corresponding user-specific reference signal mapping structure as a predetermined mapping structure.
  • the base station maps the downlink service data of the user requiring beamforming transmission and the user-specific reference signal according to the mapping structure remaining after being destroyed on the physical resource block allocated to the user.
  • the mapping structure of different configuration modes of the DwPTS slot of the Normal CP where the DwPTS slot carries 12, 11, 10, and 9 OFDM symbols respectively, the unnecessary OFDM is cancelled.
  • is Extended CP The mapping structure of different configuration modes of the DwPTS slot, wherein the DwPTS slot carries 10, 9, and 8 OFDM symbols, respectively, and the remaining mapping structure after the unnecessary OFDM symbols are removed.
  • the block portion of the grid represents a cell-specific reference signal, indicating a user-specific reference signal. Therefore, the OFDM symbol that is destroyed may include a resource unit that carries a user-specific reference signal in addition to the resource unit that carries the data symbol.
  • the base station uses the same shaping matrix for beamforming the downlink service data and the user-specific reference signal, Form data.
  • the system allocates resources to users in units of physical resource blocks, and each physical resource block includes 12 subcarriers.
  • the base station performs resource mapping on the shaping data, the primary synchronization signal, the control signaling, the cell-specific reference signal, and other user data through the shaping matrix to form DwPTS time slot data, wherein the control signaling is in the DwPTS time slot.
  • the primary synchronization signal is transmitted on the center 72 subcarriers of the third OFDM symbol in the DwPTS slot.
  • mapping structure of the user-specific reference signal should not be limited to the mode illustrated in this embodiment, and various adjustments can be made to the mapping structure of the user-specific reference signal, and the technical solution of the present invention still applies. The changes should be covered by the scope of protection of the invention.
  • the system functional structure diagram of the beamforming transmission proposed by the present invention includes a base station and at least one terminal.
  • the base station 100 is configured to map the downlink service data and the user-specific reference signal of the user that needs to be beamformed and transmitted in the DwPTS time slot according to a predetermined mapping structure, perform beamforming processing, and process the result of the shaping process.
  • the synchronization signal, the control signaling, the cell-specific reference signal, and other user data are used for resource mapping to form DwPTS time slot data; and the terminal 200 is configured to receive DwPTS time slot data.
  • the base station 100 of the present invention includes a data processing module 110 and a transmitting module 120.
  • the data processing module 110 is configured to map the downlink service data and the user-specific reference signal of the user that needs to be beamformed and transmitted in the DwPTS time slot according to a predetermined mapping structure, and perform beamforming processing, and Mapping the result of the shaping process, the primary synchronization signal, the control signaling, the cell-specific reference signal, and other user data to form DwPTS time slot data;
  • the transmitting module 120 is configured to send the DwPTS time slot data obtained by the data processing module 110 to the terminal. 200 launches.
  • the data processing module 110 further includes a judging module 111, a resource mapping module 112, and an embedding processing module 113.
  • the determining module 111 is configured to obtain the number of OFDM symbols carried in the DwPTS slot, determine the length T of the DwPTS slot and the length To of one OFDM symbol according to the type of the cyclic prefix CP of the OFDM symbol and the specific configuration of the DwPTS slot.
  • the resource mapping module 112 is configured to map the downlink service data and the user-specific reference signal of the user that needs to be beamformed and transmitted in the DwPTS slot according to a predetermined mapping.
  • the structure is mapped, and the shaping processing result is obtained by the shaping processing module 113, and the processing results of the shaping processing, the main synchronization signal, the control signaling, the cell-specific reference signal, and other user data are mapped to form DwPTS time slot data;
  • the type processing module 113 is configured to perform U-type processing on the downlink service data and the user-specific reference signal mapped by the resource mapping module 112 according to the predetermined mapping structure.
  • the resource mapping module 112 includes a structure selection module 1121 and a structure mapping module 1122.
  • the structure selection module 1121 is configured to determine a user-specific reference signal mapping structure according to the type of the cyclic prefix CP.
  • the structure mapping module 1122 is configured to: remove the nth and subsequent OFDM symbols in the user-specific reference signal mapping structure, The first n OFDM symbols in the user-specific reference signal mapping structure are reserved as a predetermined mapping structure, and the downlink service data and the user-specific reference signal are mapped on a physical resource block allocated to the user according to a predetermined mapping structure.
  • each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • the integrated modules, if implemented in the form of software functional modules and sold or used as separate products, may also be stored in a computer readable storage medium.
  • the above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

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Description

一种波束赋型传输的方法、 系统及装.
技术领域
本发明涉及移动通信领域, 具体而言, 本发明涉及移动通信多天线技术领 域。 背景技术
物理层的多天线技术已经成为下一代无线通信系统的关键:技术之一, 多天 线技术具有很多优点, 比如利用多天线的复用增益来扩大系统的吞吐量, 利用 多天线的分集增益来提高系统性能, 利用天线的方向性增益来区分用户 消除 用户间的千扰等等。 3GPP (3rd Generation Partnership Project, 第三代合作伙伴 计 ¾ )中的 UTE (Long T½mi Evokition, 长期演进)系统就支持发射分集、 空间复 用技术以及波束赋型等多种 MIMO (Multiple-Input Multiple- Output, 多入多出) 技术。
目窗, —LTE中 FDD ( Frequency Division Duplex - 频分双工 )和 TDD ( Time Division Duplex , 时分双工) 的†贞结构都采用 1ms的子 Φ贞 ( Subfraine )结构, 其中,如图 1所示 ,为 TD.D幀结构的示意图,每个 TDD无线幀( One radio frame ) 的半个无线幀 ( half- frame )由 5个子帧组成, 每个予帧为 1ms, 每个子帧由两 个 0.5ms的 S ot构成。
对于上、 下行转换周期为 5ms的系统,每一个半帧包括 4个 1還长的子幀 ( Subframe )和 3个特殊时隙 ( Special Slot ): DwPTS、 GP和 UpPTS , 3个特 殊时隙的总长为 i ms。 对于上、 下行转换周期为 10ms的系统, 第一个半^包 括 4个 1 ms长的子愤和 3个特珠时隙: DwPTS、 GP和 UpPTS; 第二个半賴只 有 5个 1 ms长的子 #1。
其中, 特殊时隙 DwPTS的长度由配置类型决定 而且.子 1 0和子幀 5以 及 DwPTS永远预留作为下行传输„ 如團 2所示, 为 DwPTS时隙的示意團, DwPTS时隙中的第一个或第一第二个 OFDM ( Orthogonal Frequency Division Multiplexing, 正交频分复用)符号中传输下行控制信令, 第三个 OFDM符号 上的 72个中心子载波总是用来传输用于进行小区搜索( Cell Search )的主同步 信号。 除广播信道 PBCH之外, 任意下行业务数椐都可占用读时隙上的空闲资 源进行传输, 例如承载物理下行共享信道 PDSCH、 物理多播信道? ( 1 等 目前, LTE系统对下行波束赋型传输有如下规定:
波束赋型用户使用用户专属参考信号 ( UE- specific reference signals )解调 物理下行共享亚务信道 PDSCH;
用户专属参考信号只 ^射在使用赋型传输的资源块中;
用户专属参考信号只占用一个天线端口即天线端口 5进行^射;
高层需要通知终端是否使用了用户专属参考信号, 即是否进行波束赋型传 输;
进行波束赋型传输时、保留端口 0, i上的小区专属参考信号(Ceii specific reference signals ), 不再使用端口 2, 3上的小区专属参考信号。
对于 E TDD系统, 特殊时隙 DwPTS也可以支持下行波束赋型传输, 然 而, 在目前 LTE的标准中, 只给出了普通业务子顿中进行波 赋型传输时用户 专属参考信号的映射祥式、 τ¾在特殊时隙 DwPTS 中进行波束赋型传输时用户 专属参考信号的映射样式却没有定义。 发明内容
本发明要解决的问题是提出一种波東赋型传输的方法、 系统及装置, 解决 在特殊时隙 DwPTS中进行波束赋型传输的问题。
为达到上迷 的,本发明公开了一种波束.赋型传输的方法, 包括以下步骤.: 基站将承载在 DwPTS 时隙中需要波束赋型传输的用户的下行业务数椐和用户 专属参考信号按照预定映射结构映射, 并进行波東赋型处理; 所述基站将所述 赋型处理结杲、 主同步信号、 控制信令、 小区专属参考信号以及其他用户数据 进行资源块射, 形成所述 DwPTS时隙数据; 所述基站向终端发送所述 DwPTS 时隙数据。
本发明另一方面还提出一种波束赋型传输的方法, 终端接收基站下发的 DwPTS时隙数据, 其中, 所述 DwPTS时隙数据包括赋型处理结果、 主同步信 号、 控制信令、 小区专属参考信号以及其他用户数椐, 所述赋型处理结果通过 以下方式确定: 所述基站将承载在所述 DwPTS 时隙中需要波束赋型传输的用 i , 并进行 ^ 型处理
本发明另一方面还提出一种波束赋型传输的系统, 包括! ^站和至少一个终 端, 所述基站, 用于将承载在 DwPTS 时隙中需要波東赋型传输的用户的下行 业务数据和用户专属参考信号按照預定映射结构映射, 并进行波東赋型处理, 以及将所迷赋型处理结果、 主同步信号、 控制信令、 小区专属参考信号和其他 用户数据进行资源映射, 形成所述 DwPTS 时隙数椐; 所述终端, 用于接收所 DwPTS时隙数椐。
本发明另一方面还提出一种基站、 包括数据处理模块和发射模块、 所迷数 据处理模块, 用于将承载在 DwPTS时隙中需要波束赋型传输的用户的下行业 务数据和用户专属参考信号按照预定^射结构映射, 并进行波束赋型处理, 以 主同步信号, 控制信令、 小区专属参考信号和其他用 形成所述 DwPTS 时隙数据; ^述发射模块, 用于将所
Figure imgf000005_0001
DwPTS时隙数据向终端发射。
由于目前标准中普通亚务子幀在进.行波.東赋型传输时, 用户专属参考信号 芊式密度较高, 如杲在 DwPTS上进.行赋型时, 扔然使用相同数量的参 考信号, 将会使得系统开销过大。 本发明综合考虑开销、 检测性能及实际应用 的问题, 提出了上述技术方案。 本发明的技术方案具有以下 ^点, 本发明的技 术方案不会额外增加用户专属参考信号映射结构, 利用本发明的技术方業, 既 能实现在特殊时隙 DwPTS 中进行波束.赋型传输, 提高系统性能, 又无需引入 新的用户专属参考信号映射结构, 实现筒单。
附围说钥
图 1为 TDD帧结构的示意图;
图 2为 DwPTS时隙的示意图;
图 3为实现波束赋型方法的流程图;
图 4为实现 DwPTS时隙波束赋型处理的流程图;
图 5为用户专属参考信号映射结构; 图 6为 Normal CP的 DwPTS时隙不同配置的映射结构;
图 7为 Extended CP的 DwPTS时隙不同配置的映射结构;
图 8为波束赋型传输的系统功能结构图。 具体实族方式
下面结合附图和实施例, 对本发明的具体实施方式作进一步详细描述: 本发明主要提出一种波束赋型传输的方法、 系统及装置, 实现在特殊时隙 DwPTS中进行波束赋型传输, 本发明的技术方案, 既能提高系统性能, 又无需 引入新的用户专属参考信号映射结构, 实现简单。
为了实现本发明之目的, 本发明提出了一种波束赋型传输的方法, 包括以 下步骤: 基站将承载在 DwPTS 时隙中需要波束赋型传输的用户的下行业务数 据和用户专属参考信号按照预定映射结构映射, 并进行波束赋型处理; 所述基 站将所述赋型处理结果、 主同步信号、 控制信令、 小区专属参考信号以及其他 用户数据进行资源映射, 形成所述 DwPTS 时隙数据; 所述基站向终端发送所 述 DwPTS时隙数据。
如图 3所示, 为实现波束赋型方法的流程图, 包括以下步骤:
步骤 A, 将承载在 DwPTS时隙中需要波束赋型传输的用户数据和用户专 属参考信号按照预定映射结构映射, 并进行波束赋型处理。
具体而言,在步骤 A中,预定映射结构依赖于 DwPTS时隙中承载的 OFDM 符号数, 承载的 OFDM符号数的不同对应有不同的映射结构。
进一步而言, DwPTS时隙中承载的 OFDM符号数依赖于所述 OFDM符号 的循环前缀 CP的类型以及 DwPTS时隙的具体配置。 通常基站根据循环前缀 CP的类型以及 DwPTS时隙的具体配置, 确定 DwPTS时隙的长度 T以及一个 OFDM符号的长度 To,得到 DwPTS时隙承载的 OFDM符号数 n,其中 n = T/To。
例如, 按照预定映射结构映射包括以下步骤:
基站根据循环前缀 CP的类型, 确定用户专属参考信号映射结构; 基站将用户专属参考信号映射结构中第 n个以后的 OFDM符号打掉,只保 留用户专属参考信号映射结构中的前 n个 OFDM符号, 作为预定映射结构; 基站在分配给该用户的物理资源块上, 将下行业务数据和用户专属参考信 号按照所述预定映射结构进行映射。
步骤 B, 将赋型处理结果、 主同步信号、 控制信令、 小区专属参考信号以 及其他用户数据进行资源映射, 形成 DwPTS时隙数据。
在步骤 B中, 将形成符合传输格式的 DwPTS时隙数据。 为了兼容现有的 系统, 例如, 控制信令在 DwPTS时隙中的第一个或第一第二个 OFDM符号上 传输, 主同步信号在所述 DwPTS时隙中的第三个 OFDM符号的中心 72个子 载波上传输。
步骤 C, 发送 DwPTS时隙数据。
基站向终端发送可以在 DwPTS时隙上进行波束赋型传输的 DwPTS时隙数 据。 相应地, 终端接收基站发送的具有波束赋型传输特性的 DwPTS 时隙的数 据。
因此, 本发明另一方面还提出了一种波束赋型传输的方法, 终端接收基站 下发的 DwPTS时隙数据, 其中, 所述 DwPTS时隙数据包括赋型处理结果、 主 同步信号、 控制信令、 小区专属参考信号以及其他用户数据, 所述赋型处理结 果通过以下方式确定: 所述基站将承载在所述 DwPTS 时隙中需要波束赋型传 输的用户的下行业务数据和用户专属参考信号按照预定映射结构映射, 并进行 波束赋型处理。
作为上述方法的实施例, 终端接收的 DwPTS 时隙数据中的预定映射结构 依赖于所述 DwPTS时隙中承载的 OFDM符号数。
作为上述方法的实施例, 终端接收的 DwPTS时隙数据中的承载的 OFDM 符号数依赖于 OFDM符号的循环前缀 CP的类型以及 DwPTS时隙的具体配置。 具体而言, 基站根据循环前缀 CP的类型以及 DwPTS时隙的具体配置, 确定 DwPTS时隙的长度 T以及一个 OFDM符号的长度 To, 得到 DwPTS时隙承载 的 OFDM符号数 n, 其中 n = T/To。
例如, 作为上述方法的实施例, 终端接收的 DwPTS 时隙数据中的实现预 定映射结构映射包括以下步骤:
基站根据循环前缀 CP的类型, 确定用户专属参考信号映射结构; 基站将用户专属参考信号映射结构中第 n个以后的 OFDM符号打掉,只保 留用户专属参考信号映射结构中的前 n个 OFDM符号, 作为预定映射结构; 基站在分配给该用户的物理资源块上, 将下行业务数据和用户专属参考信 号按照所述预定映射结构进行映射。
为了兼容现有的系统, 终端接收的 DwPTS 时隙数据中的控制信令在 DwPTS 时隙中的第一个或第一第二个 OFDM 符号上传输, 主同步信号在 DwPTS时隙中的第三个 OFDM符号的中心 72个子载波上传输。
为了进一步阐述本发明, 如图 4所示, 为本发明实现 DwPTS时隙波束赋 型处理一个具体实施例的流程图, 该实施例的波束赋型传输的方法具体包括以 下流程:
S101 ,确定传输帧的格式。目前,对于 LTE TDD系统中的特殊时隙 DwPTS, 其长度是可以根据系统的配置情况设定。 作为本发明的实施例, 表 1 给出了 DwPTS时隙的各种配置情况, 常规 Normal CP子帧中每个 OFDM符号长度为 2192 Ts, 整个子帧中一共包括 14个 OFDM符号; 扩展 Extended CP子帧中 每个 OFDM符号的长度为 2560 Ts, 整个子帧中一共包括 12个 OFDM符号。 通过计算可以得到, 对于承载 Normal CP类型的 OFDM符号的子帧, DwPTS 时隙可能承载 3、 9、 10、 11、 12个 OFDM符号, 存在五种不同的情况; 对于 承载 Extended CP的子帧, DwPTS时隙可能承载 3、 8、 9、 10个 OFDM符号, 存在四种不同的情况。无论对应于哪种类型, DwPTS时隙中的第一个或第一第 二个 OFDM符号中传输下行控制信令,第三个 OFDM符号上的 72个中心子载 波总是用来传输用于进行小区搜索 (Cell Search ) 的主同步信号。 除广播信道 PBCH之外, 任意下行业务数据都可占用该时隙上的空闲资源进行传输, 例如 承载物理下行共享信道 PDSCH、 物理多播信道 PMCH等。
表 1 特殊时隙配置情况
Figure imgf000009_0001
因此, 基站首先需要确定传输帧的格式, 判断当前 DwPTS 时隙承载的 OFDM符号的 CP是 Normal类型还是 Extended类型, 因为不同的 CP类型,
DwPTS时隙的配置情况不相同。
S102, 确定 DwPTS 时隙的配置。 作为本发明的实施例, 根据表 1 , 经过 S101之后, 基站对于不同的 CP类型, 确定 DwPTS时隙中承载的 OFDM符号 数。作为本发明的实施例,基站根据 CP的类型,根据 DwPTS时隙的具体配置, 参考表 1 , 基站能确定 DwPTS时隙的长度 T以及一个 OFDM符号的长度 To, 从而基站能得到 DwPTS时隙承载的 OFDM符号数 n,其中 n = T/To。基站对承 载在 DwPTS 时隙中需要波束赋型传输的用户的下行业务数据和用户专属参考 信号按照预定映射结构映射, 并进行波束赋型处理。
显然,基于本领域技术人员的常识, DwPTS时隙的配置不应限于本实施例 中的表 1的模式, 可以对 DwPTS时隙的配置参数作出各种调整, 所述变化应 为本发明保护范围所涵盖。
S103 , 预定映射结构的资源映射。 对特殊时隙 DwPTS进行波束赋型传输, 也就是基站将承载在 DwPTS 时隙中需要波束赋型传输的用户的下行业务数据 和用户专属参考信号按照预定映射结构映射, 并进行波束赋型处理。 经过 S101 之后, 基站已经确定 DwPTS时隙中 OFDM符号的循环前缀 CP的类型。 作为 本发明的实施例, 对于不同的 CP类型, 具有不同的用户专属参考信号的映射 结构, 这里所说的用户专属参考信号的映射结构为该用户在普通业务子帧中进 行波束赋型传输时所使用的用户专属参考信号映射结构。 如图 5所示, 为用户 专属参考信号映射结构。 其中, 左图 A为 Normal CP的用户专属参考信号映射 结构, 右图 B为 Extended CP的用户专属参考信号映射结构。 由于小区专属参 考信号在每一个下行子帧中发送, 在频域上覆盖整个系统带宽, 在时间上横跨 整个下行子帧, 图中网格的方块部分表示端口 0、 1上的小区专属参考信号。 用 户专属参考信号只在分配给用户进行波束赋形的物理资源块中的数据部分使 用, 当与小区专属参考信号同时在一个子帧中存在时, 将照图 5所示的方式进 行复用, 其中 表示用户专属参考信号。
因此, 基站根据循环前缀 CP的类型, 就能够确定用户专属参考信号的映 射结构。
经过 S102之后, 基站判断并确定 OFDM符号数 n。 基站将所述用户专属 参考信号映射结构中第 n个以后的 OFDM符号打掉,只保留相应的用户专属参 考信号映射结构中的前 n个 OFDM符号, 作为预定映射结构。 其后, 基站在分 配给该用户的物理资源块上, 将需要波束赋型传输的用户的下行业务数据和用 户专属参考信号按照打掉后剩下的映射结构进行映射。
作为本发明的实施例, 如图 6所示, 为 Normal CP的 DwPTS时隙不同配 置模式的映射结构, 其中分别为 DwPTS时隙承载 12、 11、 10、 9个 OFDM符 号时, 打掉多余 OFDM符号后剩下的映射结构。 如图 7所示, 为 Extended CP 的 DwPTS时隙不同配置模式的映射结构,其中分别为 DwPTS时隙承载 10、 9、 8个 OFDM符号时, 打掉多余 OFDM符号后剩下的映射结构。 其中, 网格的 方块部分表示小区专属参考信号, 表示用户专属参考信号。 因此, 打掉的 OFDM符号中, 除了承载数据符号的资源单元外, 还可能包括承载用户专属参 考信号的资源单元。
5104, 波束赋型处理。 对于承载在 DwPTS时隙中需要波束赋型传输的用 户的下行业务数据和用户专属参考信号, 经过 S103 之后, 基站对下行业务数 据和用户专属参考信号使用相同的赋型矩阵进行波束赋型, 得到赋型数据。
5105 , 资源映射。 作为本发明的实施例, 系统以物理资源块为单元为用户 分配资源,每个物理资源块包括 12个子载波。基站将经过赋型矩阵得到对赋型 数据、 主同步信号、 控制信令、 小区专属参考信号以及其他用户数据进行资源 映射, 形成 DwPTS时隙数据, 其中, 控制信令在 DwPTS时隙中的第一个或第 一第二个 OFDM符号中传输,主同步信号在 DwPTS时隙中的第三个 OFDM符 号的中心 72个子载波上传输。 DwPTS时隙中可能存在多个下行用户的数据, 因此, 其他用户数据可以以本发明上述提到的波束赋型传输方案在若干个物理 上传输。
显然, 基于本领域技术人员的常识, 用户专属参考信号的映射结构不应限 于本实施例中图示的模式,可以对用户专属参考信号的映射结构作出各种调整, 本发明的技术方案仍然适用, 所述变化应为本发明保护范围所涵盖。
如图 8所示, 为本发明提出的波束赋型传输的系统功能结构图, 该系统包 括基站和至少一个终端。 其中, 基站 100用于将承载在 DwPTS时隙中需要波 束赋型传输的用户的下行业务数据和用户专属参考信号按照预定映射结构映 射, 并进行波束赋型处理, 以及将赋型处理结果、 主同步信号、 控制信令、 小 区专属参考信号和其他用户数据进行资源映射, 形成 DwPTS 时隙数据; 终端 200用于接收 DwPTS时隙数据。
其中, 本发明的基站 100包括数据处理模块 110和发射模块 120。 数据处 理模块 110,用于将承载在 DwPTS时隙中需要波束赋型传输的用户的下行业务 数据和用户专属参考信号按照预定映射结构映射, 并进行波束赋型处理, 以及 将赋型处理结果、 主同步信号、 控制信令、 小区专属参考信号和其他用户数据 进行资源映射, 形成 DwPTS时隙数据; 发射模块 120用于将数据处理模块 110 得到的 DwPTS时隙数据向终端 200发射。
作为本发明的优选方案, 数据处理模块 110还包括判断模块 111、 资源映 射模块 112以及赋型处理模块 113。 判断模块 111 , 用于得到 DwPTS时隙中承 载的 OFDM符号数, 根据 OFDM符号的循环前缀 CP的类型以及 DwPTS时隙 的具体配置,确定 DwPTS时隙的长度 T以及一个 OFDM符号的长度 To,得到 DwPTS时隙承载的 OFDM符号数 n, 其中 n = T/To; 资源映射模块 112, 用于 将承载在 DwPTS 时隙中需要波束赋型传输的用户的下行业务数据和用户专属 参考信号按照预定映射结构映射,并经过赋型处理模块 113得到赋型处理结果, 以及将赋型处理结果、 主同步信号、 控制信令、 小区专属参考信号以及其他用 户数据进行资源映射, 形成 DwPTS时隙数据; 赋型处理模块 113 , 用于将经过 资源映射模块 112按照预定映射结构映射的下行业务数据和用户专属参考信号 进行 U武型处理。
作为本发明的优选方案,资源映射模块 112包括结构选择模块 1121和结构 映射模块 1122。 结构选择模块 1121 , 用于根据循环前缀 CP的类型, 确定用户 专属参考信号映射结构; 结构映射模块 1122, 用于将所述用户专属参考信号映 射结构中第 n个以后的 OFDM符号打掉,只保留用户专属参考信号映射结构中 的前 n个 OFDM符号,作为预定映射结构, 以及将下行业务数据和用户专属参 考信号在分配给该用户的物理资源块上按照预定映射结构进行映射。
本技术领域的普通技术人员可以理解实现上述实施例方法携带的全部或部 分步骤是可以通过程序来指令相关的硬件完成, 所述的程序可以存储于一种计 算机可读存储介质中,该程序在执行时, 包括方法实施例的步骤之一或其组合。
此外, 在本发明各个实施例中的各功能单元可以集成在一个处理模块中, 也可以是各个单元单独物理存在, 也可以两个或两个以上单元集成在一个模块 中。 上述集成的模块既可以釆用硬件的形式实现, 也可以釆用软件功能模块的 形式实现。 所述集成的模块如果以软件功能模块的形式实现并作为独立的产品 销售或使用时, 也可以存储在一个计算机可读取存储介质中。
上述提到的存储介质可以是只读存储器, 磁盘或光盘等。 以上所述仅是本发明的优选实施方式, 应当指出, 对于本技术领域的普通 技术人员来说, 在不脱离本发明原理的前提下, 还可以做出若干改进和润饰, 这些改进和润饰也应视为本发明的保护范围。

Claims

权利要求书
1、 一种波束赋型传输的方法, 其特征在于, 包括以下步骤:
基站将承载在 DwPTS 时隙中需要波束赋型传输的用户的下行业务数据和 用户专属参考信号按照预定映射结构映射, 并进行波束赋型处理;
所述基站将所述赋型处理结果、 主同步信号、 控制信令、 小区专属参考信 号以及其他用户数据进行资源映射, 形成所述 DwPTS时隙数据;
所述基站向终端发送所述 DwPTS时隙数据。
2、如权利要求 1所述的波束赋型传输的方法, 其特征在于, 所述预定映射 结构依赖于所述 DwPTS时隙中承载的 OFDM符号数。
3、 如权利要求 2所述的波束赋型传输的方法, 其特征在于, 所述 DwPTS 时隙中承载的 OFDM符号数依赖于所述 OFDM符号的循环前缀 CP的类型以及 所述 DwPTS时隙的具体配置,所述基站根据所述循环前缀 CP的类型以及所述 DwPTS时隙的具体配置, 确定所述 DwPTS时隙的长度 T以及一个 OFDM符 号的长度 To, 得到所述 DwPTS时隙承载的 OFDM符号数 n, 其中 n = T/To。
4、如权利要求 3所述的波束赋型传输的方法, 其特征在于, 所述按照预定 映射结构映射包括以下步骤:
所述基站根据所述循环前缀 CP的类型,确定用户专属参考信号映射结构; 所述基站将所述用户专属参考信号映射结构中第 n个以后的 OFDM符号打 掉, 只保留所述用户专属参考信号映射结构中的前 n个 OFDM符号,作为所述 预定映射结构;
所述基站在分配给该用户的物理资源块上, 将所述下行业务数据和用户专 属参考信号按照所述预定映射结构进行映射。
5、如权利要求 4所述的波束赋型传输的方法, 其特征在于, 所述控制信令 在所述 DwPTS时隙中的第一个或第一第二个 OFDM符号上传输, 所述主同步 信号在所述 DwPTS时隙中的第三个 OFDM符号的中心 72个子载波上传输。
6、 一种波束赋型传输的方法, 其特征在于, 终端接收基站下发的 DwPTS 时隙数据, 其中, 所述 DwPTS 时隙数据包括赋型处理结果、 主同步信号、 控 制信令、 小区专属参考信号以及其他用户数据, 所述赋型处理结果通过以下方 式确定: 所述基站将承载在所述 DwPTS 时隙中需要波束赋型传输的用户的下 行业务数据和用户专属参考信号按照预定映射结构映射,并进行波束赋型处理。
7如权利要求 6所述的波束赋型传输的方法, 其特征在于, 所述预定映射 结构依赖于所述 DwPTS时隙中承载的 OFDM符号数。
8、 如权利要求 7所述的波束赋型传输的方法, 其特征在于, 所述 DwPTS 时隙中承载的 OFDM符号数依赖于所述 OFDM符号的循环前缀 CP的类型以及 所述 DwPTS时隙的具体配置,所述基站根据所述循环前缀 CP的类型以及所述 DwPTS时隙的具体配置, 确定所述 DwPTS时隙的长度 T以及一个 OFDM符 号的长度 To, 得到所述 DwPTS时隙承载的 OFDM符号数 n, 其中 n = T/To。
9、如权利要求 8所述的波束赋型传输的方法, 其特征在于, 所述按照预定 映射结构映射包括以下步骤:
所述基站根据所述循环前缀 CP的类型,确定用户专属参考信号映射结构; 所述基站将所述用户专属参考信号映射结构中第 n个以后的 OFDM符号打 掉, 只保留所述用户专属参考信号映射结构中的前 n个 OFDM符号,作为所述 预定映射结构;
所述基站在分配给该用户的物理资源块上, 将所述下行业务数据和用户专 属参考信号按照所述预定映射结构进行映射。
10、 如权利要求 9所述的波束赋型传输的方法, 其特征在于, 所述控制信 令在所述 DwPTS时隙中的第一个或第一第二个 OFDM符号上传输, 所述主同 步信号在所述 DwPTS时隙中的第三个 OFDM符号的中心 72个子载波上传输。
11、 一种波束赋型传输的系统, 其特征在于, 包括基站和至少一个终端, 所述基站, 用于将承载在 DwPTS 时隙中需要波束赋型传输的用户的下行 业务数据和用户专属参考信号按照预定映射结构映射, 并进行波束赋型处理, 以及将所述赋型处理结果、 主同步信号、 控制信令、 小区专属参考信号和其他 用户数据进行资源映射, 形成所述 DwPTS时隙数据;
所述终端, 用于接收所述 DwPTS时隙数据。
12、 一种基站, 其特征在于, 包括数据处理模块和发射模块,
所述数据处理模块, 用于将承载在 DwPTS 时隙中需要波束赋型传输的用 户的下行业务数据和用户专属参考信号按照预定映射结构映射, 并进行波束赋 型处理, 以及将所述赋型处理结果、 主同步信号、 控制信令、 小区专属参考信 号和其他用户数据进行资源映射, 形成所述 DwPTS时隙数据;
所述发射模块, 用于将所述数据处理模块得到的所述 DwPTS 时隙数据向 终端发射。
13、如权利要求 12所述的基站, 其特征在于, 所述数据处理模块包括判断 模块、 资源映射模块以及赋型处理模块,
所述判断模块, 用于得到 DwPTS时隙中承载的 OFDM符号数, 根据所述 OFDM符号的循环前缀 CP的类型以及所述 DwPTS时隙的具体配置, 确定所 述 DwPTS时隙的长度 T以及一个 OFDM符号的长度 To , 得到所述 DwPTS时 隙承载的 OFDM符号数 n, 其中 n = T/To;
所述资源映射模块, 用于将承载在 DwPTS 时隙中需要波束赋型传输的用 户的下行业务数据和用户专属参考信号按照预定映射结构映射, 并经过所述赋 型处理模块得到赋型处理结果, 以及将所述赋型处理结果、 主同步信号、 控制 信令、 小区专属参考信号以及其他用户数据进行资源映射, 形成所述 DwPTS 时隙数据;
所述赋型处理模块, 用于将经过所述资源映射模块按照预定映射结构映射 的下行业务数据和用户专属参考信号进行赋型处理。
14、如权利要求 13所述的基站, 其特征在于, 所述资源映射模块还包括结 构选择模块和结构映射模块,
所述结构选择模块, 用于根据所述循环前缀 CP的类型, 确定用户专属参 考信号映射结构;
所述结构映射模块, 用于将所述用户专属参考信号映射结构中第 n个以后 的 OFDM符号打掉,只保留所述用户专属参考信号映射结构中的前 n个 OFDM 符号, 作为所述预定映射结构, 以及将所述下行业务数据和用户专属参考信号 在分配给该,
PCT/CN2009/000594 2008-05-27 2009-05-26 一种波束赋型传输的方法、系统及装置 WO2009143710A1 (zh)

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