WO2009097821A1 - 一种下行传输的方法和装置 - Google Patents

一种下行传输的方法和装置 Download PDF

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Publication number
WO2009097821A1
WO2009097821A1 PCT/CN2009/070348 CN2009070348W WO2009097821A1 WO 2009097821 A1 WO2009097821 A1 WO 2009097821A1 CN 2009070348 W CN2009070348 W CN 2009070348W WO 2009097821 A1 WO2009097821 A1 WO 2009097821A1
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Prior art keywords
sch
dwpts
downlink
control signaling
mapping
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PCT/CN2009/070348
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English (en)
French (fr)
Inventor
Guojun Xiao
Shiqiang Suo
Xueming Pan
Libo Wang
Yu Ding
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Da Tang Mobile Communications Equipment Co., Ltd.
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Publication of WO2009097821A1 publication Critical patent/WO2009097821A1/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
    • H04L27/2602Signal structure
    • H04L27/261Details of reference signals
    • H04L27/2613Structure of the reference signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation

Definitions

  • the present invention relates to mobile communication technologies, and in particular, to a method and apparatus for downlink transmission. Background of the invention
  • LTE Long Term Evolution
  • the first type of radio frame (hereinafter referred to as Typel) is applicable to the Frequency Division Duplex (FDD) system and the Time Division Duplex (TDD) system.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • Typel When Typel is applied to the TDD system, there are 10 subframes available for uplink and downlink every 10ms. Each subframe is used for uplink or downlink, and subframe 0 and subframe 5 are always allocated for downlink transmission.
  • Type 2 The second type of radio frame (hereinafter referred to as Type 2) is only applicable to the TDD system.
  • the structure is shown in Figure 1, where:
  • the frame length of the radio frame is 10 ms, and each frame is divided into two 5 ms half frames. Each 5ms field is further divided into 8 regular time slots each having a length of 0.5 ms and a special time slot having a length of 1 ms.
  • the 1 ms special time slot is composed of a downlink pilot time slot (DwPTS) and a guard interval. (Guard Period, GP) and uplink pilot time slot (UpPTS); at the same time, every two regular time slots are paired to form one subframe, wherein subframe #0 and downlink pilot time slot are always used for downlink transmission, and The uplink pilot time slot is always used for uplink transmission.
  • DwPTS downlink pilot time slot
  • Guard interval Guard Period, GP
  • UpPTS uplink pilot time slot
  • the LTE system is based on Orthogonal Frequency Division Multiplexing (OFDM) technology, and the subcarrier spacing is set to 15 kHz, and the corresponding OFDM symbol length is 66.67 us.
  • OFDM Orthogonal Frequency Division Multiplexing
  • Each slot of Typel and Type2 is used.
  • the length is 0.5ms. Therefore, when supporting small coverage, a short cyclic prefix (CP) with a length of 4.7us is used, and each slot contains 7 OFDM symbols. When large coverage is supported, the length is 16.67us. Long CP, each slot contains 6 OFDM symbols.
  • the mapping position of the pilot symbol, D indicates the mapping position of the data signal, and the downlink control signaling occupies at most the first m OFDM symbols in the subframe (m ⁇ 3, m is a natural number), and the mapping position may be the removal of the pilot.
  • Each time-frequency domain resource location outside the symbol mapping location.
  • one subframe contains 14 OFDM symbols, as shown in Figure 3.
  • the pilot symbols on antenna ports 0, 1 occupy the first and fifth in the time domain.
  • 8 OFDM symbols the pilot symbols on the antenna ports 2, 3 occupy the 2nd and 9th OFDM symbols, and the frequency domain spacing between the pilot symbols on the same antenna port in the frequency domain is 6 subcarriers;
  • one subframe contains 12 OFDM symbols, as shown in FIG. 3, at which time the pilot symbols on antenna ports 0, 1 occupy the first, fourth, seventh, and tenth times in the time domain.
  • the OFDM symbols, the pilot symbols on antenna ports 2, 3 occupy the 2nd and 8th OFDM symbols, and the frequency domain spacing between the pilot symbols on the same antenna port in the frequency domain is 6 subcarriers.
  • the current 3GPP standard specifies the time-frequency domain location of the P-SCH as shown in FIG. 4, and the P-SCH is in the time domain.
  • the first OFDM symbol of the DwPTS is occupied, and the frequency domain location is the middle 6 subcarrier positions of the cell system bandwidth.
  • the resource locations other than the resource location occupied by the P-SCH in the DwPTS are often used to transmit downlink data.
  • the P-SCH since the P-SCH is located in the first OFDM symbol bit in the DwPTS, and the DwPTS is used for downlink data transmission, the first 2 OFDM symbols of the DwPTS usually need to perform pilot symbols and downlink control signals.
  • the mapping of the command, so the mapping position of the P-SCH may conflict with the mapping position of the pilot symbol and the downlink control signaling, thereby affecting the mapping of the control channel and the performance of the data transmission.
  • the P-SCH may conflict with the mapping position of the control signaling and the pilot symbol, thereby affecting the mapping of the control channel and the performance of the data transmission.
  • the embodiments of the present invention provide a downlink transmission method and device, which can prevent the P-SCH from affecting control signaling and pilot symbols, and reduce system complexity. .
  • a method for downlink transmission comprising:
  • DwPTS Configuring DwPTS in a special time slot to carry downlink control signaling, P-SCH, downlink data, and downlink pilot symbols, where the DwPTS includes lengths of n OFDM symbols, n is a natural number and n > 3;
  • the specified location includes: a time domain location is The third OFDM symbol position of the DwPTS; the frequency domain location is the middle 6 subcarriers of the system bandwidth, and the downlink control signaling, the downlink data, and the downlink pilot symbols are mapped to other time-frequency resource locations other than the P-SCH ;
  • the downlink data is transmitted according to the configured DwPTS and the set resource mapping location.
  • a device for downlink transmission comprising: a DwPTS setting module, a mapping module and a downlink transmission module;
  • the DwPTS setting module is configured to configure DwPTS bearer downlink control signaling, P-SCH, downlink data, and downlink pilot symbols in a special time slot, where the DwPTS includes lengths of n OFDM symbols, n is a natural number and n > 3;
  • the mapping module maps the P-SCH to a specified location, where the specified location includes: a time domain location is a third OFDM symbol location of the DwPTS; a frequency domain location is an intermediate 6 subcarriers of the system bandwidth, and the downlink is Control signaling, downlink data, and downlink pilot symbols are mapped to other time-frequency resource locations other than the P-SCH;
  • the downlink transmission module performs downlink data transmission according to the setting of the DwPTS setting module and the resource mapping position set by the mapping module.
  • the method and apparatus for downlink transmission in the embodiment of the present invention configure the length of the DwPTS to be not less than the length of three OFDM symbol bits, and configure the P-SCH in the downlink control signaling and
  • the co-existence of P-SCH with control signaling and pilot symbols is implemented at the time-frequency resource locations where the reference symbols do not affect each other, and the method and apparatus implement the cartridges.
  • FIG. 1 is a schematic diagram of a frame structure of a Type 1 in the prior art.
  • FIG. 2 is a schematic diagram of a frame structure for an LTE TDD system in the prior art.
  • FIG. 3 is a schematic diagram of a resource mapping location on a time-frequency domain of a Type 2 subframe in the prior art.
  • FIG. 4 is a schematic diagram of carrying a P-SCH in a DwPTS in the prior art.
  • FIG. 5 is a schematic flowchart diagram of a method for downlink transmission according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a DwPTS according to a first preferred embodiment A of the embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a DwPTS according to a first preferred embodiment B of the embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a DwPTS according to a first preferred embodiment C of the embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a DwPTS according to a second preferred embodiment of the present invention.
  • FIG. 10 is a schematic diagram showing the composition of a device for downlink transmission according to an embodiment of the present invention. Mode for carrying out the invention
  • the embodiment of the invention provides a method for downlink transmission, and the process thereof is shown in FIG. 5, which includes:
  • Step 501 Configure DwPTS in a special time slot to carry downlink control signaling, P-SCH, downlink data, and downlink pilot symbols, where the DwPTS includes lengths of n OFDM symbols, where n is a natural number and 11 > 3;
  • Step 502 Configure a mapping position of the P-SCH, where the time domain location is the third OFDM symbol position of the DwPTS, and the frequency domain location is the middle 6 subcarriers of the system bandwidth, and downlink control signaling, downlink data, and downlink guidance The frequency symbols are mapped to time-frequency resources other than P-SCH in the DwPTS.
  • Step 503 Perform downlink data transmission according to the length of the OFDM symbol included in the configured DwPTS and the set time-frequency resource mapping position.
  • Embodiment 1 To further illustrate the process and effect of downlink data transmission by using the configured DwPTS, the following describes the downlink transmission method by using several specific embodiments: Embodiment 1
  • the length of the DwPTS in the LTE TDD system is greater than or equal to the length of three OFDM symbols, and the system bandwidth is greater than the frequency domain bandwidth of the P-SCH at this time;
  • the P-SCH is set to be mapped in the third OFDM symbol bit of the DwPTS, and at this time, the P-SCH occupies the position of the middle 6 subcarriers of the system bandwidth, as shown in FIG. 6.
  • the system bandwidth is larger than the bandwidth of the P-SCH, the frequency band of the third OFDM symbol bit except the middle 6 subcarriers can still be used for transmission control signaling, and the mapping position of the pilot symbol and the third OFDM are The symbol bits do not overlap. Therefore, it is only necessary to avoid the frequency domain position of the middle 6 subcarriers when the third OFDM symbol bit is used for mapping of control signaling, that is, P-SCH and control signaling and pilot symbols can be implemented. Coexistence.
  • control signaling only occupies the first OFDM symbol
  • the other configuration conditions of the system are the same as A, and the P-SCH is still configured in the third OFDM symbol of the DwPTS for mapping, as shown in FIG. 7.
  • the system performs control signaling mapping on the first OFDM symbol bit.
  • the third OFDM bit only data needs to be mapped to a frequency domain position other than the middle 6 subcarriers, that is, P-SCH can be implemented. Coexistence of control signaling and pilot symbols.
  • the length of the DwPTS in the system is greater than or equal to the length of four OFDM symbols, and the system bandwidth is equal to the frequency domain bandwidth occupied by the P-SCH, which is 6 subcarriers, and the control signaling occupies at most 3 OFDM symbols;
  • the third OFDM symbol bit is fully used for mapping of the P-SCH, and the control signaling is mapped on the first, second and fourth OFDM symbol bits.
  • the minimum length of the DwPTS is not less than the length of three OFDM symbol bits, and the P-SCH is configured to be independent of the downlink control signaling and the reference symbol.
  • the coexistence of the P-SCH with the control signaling and the pilot symbols is implemented, and the method implements the cartridge.
  • the embodiment of the present invention further provides an apparatus for performing downlink data transmission, and the composition thereof is as shown in FIG. 10, which includes: a DwPTS setting module 1010, a mapping module 1020, and a downlink transmission module 1030;
  • the DwPTS setting module 1010 is configured to configure DwPTS bearer downlink control signaling, P-SCH, downlink data, and downlink pilot symbols in a special time slot, where the DwPTS includes at least n OFDM symbols, where n is a natural number and n > 3;
  • the mapping module 1020 is configured to map the P-SCH to a specified location, where the specified location includes: a time domain location is a third OFDM symbol location of the DwPTS; a frequency domain location is a middle six subcarriers of the system bandwidth, and Downlink control signaling, downlink data, and downlink pilot symbols are mapped to other time-frequency resource locations other than the P-SCH;
  • the downlink transmission module 1030 performs downlink data transmission according to the configured DwPTS and the set resource mapping location.
  • the mapping module 1020 includes: a first P-SCH determining unit 1021 and a first control signaling mapping unit 1022;
  • the first P-SCH determining unit 1021 when the time domain location of the P-SCH is the third OFDM symbol bit of the DwPTS and the system bandwidth is greater than the P-SCH bandwidth, the first control signaling mapping unit 1022 is notified;
  • the first control signaling mapping unit 1022 according to the notification of the first P-SCH determining unit 1021, the first 3 OFDM symbol bits or the 1st OFDM symbol of the DwPTS The bits are mapped for control signaling.
  • the mapping module 1020 further includes: a second P-SCH determining unit 1023 and a second control signaling mapping unit 1024;
  • the second P-SCH determining unit 1023 when the time domain location of the P-SCH is the third OFDM symbol bit of the DwPTS and the system bandwidth is equal to the P-SCH bandwidth, notifying the second control signaling mapping unit 1024;
  • the second control signaling mapping unit 1024 performs control signaling mapping on the first two OFDM symbol bits of the DwPTS according to the notification by the second P-SCH determining unit 1023.
  • the mapping module 1020 further includes a DwPTS determining unit 1025;
  • the DwPTS determining unit 1025 when the length of the DwPTS is greater than or equal to 4 OFDM symbols, notify the second control signaling mapping unit 1024;
  • the second control signaling mapping unit 1024 is configured to perform control signaling mapping on the 4th OFDM symbol bit of the DwPTS.
  • the downlink transmission system configureds the minimum length of the DwPTS to be not less than the length of 3 OFDM symbol bits, and configures the P-SCH at a time-frequency resource location that does not affect the downlink control signaling and the reference symbol.
  • the coexistence of the P-SCH with the control signaling and the pilot symbols is implemented, and the device structure is single.

Description

一种下行传输的方法和装置 技术领域
本发明涉及移动通信技术, 具体涉及一种下行传输的方法和装置。 发明背景
目前, 第三代移动通信系统标准化组织 (3GPP )启动了 3G无线接 口技术的长期演进 ( Long Time Evolution, LTE ) 系统研究项目。 根据 研究进展, LTE系统确定支持 2种无线帧结构:
A、 第一类无线帧(下文筒称 Typel ) , 适用于频分双工(Frequency Division Duplex, FDD ) 系统和时分双工( Time Division Duplex, TDD ) 系统, 其结构如图 1所示, 其中:
Typel的帧长为 10ms, 由 20个时隙组成, 每时隙长度为 0.5ms, 图 1中标记为 #0~#19。每两个连续的时隙定义为一个子帧,共有 10个子帧, 即: 子帧 i由时隙 2i和 2i+l组成, 其中 i=0、 1、 2 9。
当 Typel应用于 FDD系统时, 由于频分双工系统的上下行在频域 上是分开的, 因此每 10ms时间内, 上下行都有 10个子帧可用。
当 Typel应用于 TDD系统时, 每 10ms时间内, 上下行共有 10个 子帧可用, 每个子帧要么用于上行, 要么用于下行, 其中子帧 0和子帧 5总是分配为下行传输。
B、 第二类无线帧 (下文筒称 Type2 ) , 仅适用于 TDD系统, 其结 构如图 1所示, 其中:
无线帧的帧长为 10ms, 每帧分为 2个 5ms的半帧。 将每个 5ms的 半帧进一步划分成 8个长度均为 0.5ms的常规时隙和 1个长度为 1ms的 特殊时隙, 该 1ms 的特殊时隙由下行导频时隙 (DwPTS ) 、 保护间隔 ( Guard Period, GP )和上行导频时隙 ( UpPTS )构成; 同时, 每两个 常规时隙配对组成一个子帧,其中子帧 #0和下行导频时隙总是用于下行 传输, 而上行导频时隙总是用于上行传输。
所述的 LTE系统基于正交频分复用(Orthogonal Frequency Division Multiplexing, OFDM)技术, 其子载波间隔设定为 15 千赫兹, 对应的 OFDM符号长度为 66.67us,由于 Typel、Type2每个时隙长度均为 0.5ms, 因此, 在支持小覆盖范围时, 使用长度为 4.7us的短循环前缀(CP ) , 每时隙包含 7个 OFDM符号; 而在支持大覆盖时, 使用长度为 16.67us 的长 CP, 每时隙包含 6个 OFDM符号。
图 3示出了 Type2的帧结构下, 下行子帧 (包括两个常规时隙 ) 的 时频域结构示意图, 图中 Ri ( i=0、 1、 2、 3 )表示第 i个天线端口上导 频符号的映射位置, D表示数据信号的映射位置, 同时, 下行控制信令 最多占用子帧中的前 m个 OFDM符号 (m≤3 , m为自然数) , 其映射 位置可以为除去导频符号映射位置之外的各个时频域资源位置。
当循环前缀( CP )设置为短 CP配置时,一个子帧中包含 14个 OFDM 符号,如图 3所示,此时天线端口 0、 1上的导频符号在时域上占用第 1、 5、 8、 12个 OFDM符号, 天线端口 2、 3上的导频符号则占用第 2、 9 个 OFDM符号, 频域上同一个天线端口上的导频符号间的频域间隔为 6 个子载波;
当 CP设置为长 CP配置时, 一个子帧中包含 12个 OFDM符号, 如 图 3所示, 此时天线端口 0、 1上的导频符号在时域上占用第 1、 4、 7、 10个 OFDM符号,天线端口 2、 3上的导频符号则占用第 2、 8个 OFDM 符号,频域上同一个天线端口上的导频符号间的频域间隔为 6个子载波。
下行主同步信道(P-SCH )在特殊时隙的 DwPTS 中承载时, 目前 的 3GPP标准中规定 P-SCH的时频域位置如图 4所示, P-SCH在时域上 占用 DwPTS的第一个 OFDM符号, 频域位置为小区系统带宽的中间 6 个子载波位置。
为了提高数据传输的效率, 常常将 DwPTS中除去 P-SCH占用的资 源位置之外的其他资源位置用来传输下行数据。 在这种情况下, 由于 P-SCH位于 DwPTS中的第一个 OFDM符号位, 而利用 DwPTS进行下 行数据传输时, 所述 DwPTS的前 2个 OFDM符号位通常需要进行导频 符号和下行控制信令的映射,因此所述的 P-SCH的映射位置可能会与导 频符号和下行控制信令的映射位置产生沖突, 从而影响控制信道的映射 和数据传输的性能。
为解决该问题, 需要在网络侧为 DwPTS 中进行下行数据传输这种 方式专门设置一套规则, 系统的设计复杂度和通信时的处理复杂度将会 大大增加, 稳定性也会相应降低。
由上述分析可以看出,现有 LTE TDD系统在 DwPTS中进行数据传 输时, P-SCH可能会与控制信令及导频符号产生映射位置的沖突, 从而 影响控制信道的映射和数据传输的性能。 发明内容
本发明实施例提供一种下行传输的方法和装置,能够使得 P-SCH与 控制信令及导频符号互不影响, 降低系统复杂度。 。
根据上述目的, 本发明实施例的技术方案是这样实现的:
一种下行传输的方法, 该方法包括:
配置特殊时隙中的 DwPTS承载下行控制信令、 P-SCH、 下行数据 和下行导频符号, 所述 DwPTS包括 n个 OFDM符号的长度, n为自然 数且 n > 3;
将所述 P-SCH 映射到指定位置, 所述指定位置包括: 时域位置为 DwPTS的第 3个 OFDM符号位置; 频域位置为系统带宽的中间 6个子 载波, 并将下行控制信令、 下行数据和下行导频符号映射到所述 P-SCH 以外的其他时频资源位置上;
根据所述配置的 DwPTS和设定的资源映射位置, 进行下行数据的 传输。
一种下行传输的装置, 该装置包括: DwPTS设置模块、 映射模块和 下行传输模块;
所述 DwPTS设置模块,配置特殊时隙中的 DwPTS承载下行控制信 令、 P-SCH、 下行数据和下行导频符号, 所述 DwPTS包括 n个 OFDM 符号的长度, n为自然数且 n > 3;
所述映射模块,将所述 P-SCH映射到指定位置,所述指定位置包括: 时域位置为 DwPTS的第 3个 OFDM符号位置; 频域位置为系统带宽的 中间 6个子载波, 并将下行控制信令、 下行数据和下行导频符号映射到 所述 P-SCH以外的其他时频资源位置上;
所述下行传输模块, 根据 DwPTS设置模块的设定和映射模块设定 的资源映射位置, 进行下行数据的传输。
从上述方案可以看出,本发明实施例的这种下行传输的方法和装置, 通过配置 DwPTS的最小长度不小于 3个 OFDM符号位的长度, 同时将 P-SCH配置在与下行控制信令及参考符号互不影响的时频资源位置上, 实现了 P-SCH 与控制信令及导频符号的共存, 且该方法和装置实现筒 单。 附图简要说明
图 1为现有技术中 Typel的帧结构示意图。
图 2为现有技术中用于 LTE TDD系统的帧结构的示意图。 图 3为现有技术中 Type2子帧的时频域上资源映射位置的示意图。 图 4为现有技术中在 DwPTS中承载 P-SCH的示意图。
图 5为本发明实施例中下行传输的方法的流程示意图。
图 6为本发明实施例中第一较佳实施例 A的 DwPTS结构示意图。 图 Ί为本发明实施例中第一较佳实施例 B的 DwPTS结构示意图。 图 8为本发明实施例中第一较佳实施例 C的 DwPTS结构示意图。 图 9为本发明实施例中第二较佳实施例的 DwPTS结构示意图。 图 10为本发明实施例中下行传输的装置的组成结构的示意图。 实施本发明的方式
为使本发明的目的、 技术方案和优点更加清楚明白, 以下举实施例 并参照附图, 对本发明进一步详细说明。
本发明实施例提供一种下行传输的方法, 其流程如图 5所示, 其中 包括:
步骤 501 : 配置特殊时隙中的 DwPTS承载下行控制信令、 P-SCH、 下行数据和下行导频符号, 所述 DwPTS包括 n个 OFDM符号的长度, n为自然数且11 > 3;
步骤 502: 配置 P-SCH的映射位置, 其中时域位置为 DwPTS的第 3个 OFDM符号位置, 而频域位置为系统带宽的中间 6个子载波, 并将 下行控制信令、 下行数据和下行导频符号映射到 DwPTS中除 P-SCH以 外的其他时频资源上。
步骤 503 : 根据配置的 DwPTS包含的 OFDM符号的长度, 以及设 定的时频资源映射位置, 进行下行数据的传输。
为了进一步说明利用配置后的 DwPTS进行下行数据传输的过程和 效果, 下面通过几个具体实施例, 对所述下行传输的方法进行举例: 实施例一
A、设定 LTE TDD系统中的 DwPTS的长度大于等于 3个 OFDM符 号的长度, 且此时系统带宽大于 P-SCH的频域带宽;
设置 P-SCH在 DwPTS的第三个 OFDM符号位进行映射, 且此时 P-SCH占据系统带宽的中间 6个子载波的位置, 如图 6所示。 显然, 由 于所述系统带宽大于 P-SCH的带宽, 因此第三个 OFDM符号位中除去 中间 6个子载波的频带仍然可以用于传输控制信令, 且导频符号的映射 位置与第三个 OFDM符号位并不重叠,因此此时只需要在第三个 OFDM 符号位进行控制信令的映射时避开中间 6个子载波的频域位置, 即可以 实现 P-SCH与控制信令及导频符号的共存。
B、 若控制信令只占用第一个 OFDM符号, 系统的其它配置条件与 A相同, P-SCH仍然配置在 DwPTS的第三个 OFDM符号为进行映射, 如图 7所示。显然,此时系统在第一个 OFDM符号位上进行控制信令的 映射,在第三个 OFDM位中只需要将数据映射到中间 6个子载波以外的 频域位置, 即可以实现 P-SCH与控制信令及导频符号的共存。
C、 其他条件与 A相同, 唯一的区別在于此时系统的带宽与 P-SCH 占用的频带宽度相同, 均为 6个子载波, 则如图 8所示, 此时 DwPTS 的第三个 OFDM符号位完全被 P-SCH占用, 此时需要将所有的控制信 令在前两个 OFDM符号位进行映射。
实施例二
假设系统中 DwPTS的长度大于等于 4个 OFDM符号的长度, 系统 带宽等于 P-SCH占据的频域带宽, 均为 6个子载波,控制信令最多占用 3个 OFDM符号;
设置 P-SCH在 DwPTS的第三个 OFDM符号位进行映射,由于控制 信道最多占用 3个 OFDM符号, 且 P-SCH的带宽与系统带宽相同, 因 此如图 9所示, 第三个 OFDM符号位完全用于 P-SCH的映射, 控制信 令在第一、 二和四个 OFDM符号位上进行映射。
由上述说明可知, 本发明实施例提供的下行传输的方法, 通过配置 DwPTS的最小长度不小于 3个 OFDM符号位的长度, 同时将 P-SCH配 置在与下行控制信令及参考符号互不影响的时频资源位置上, 实现了 P-SCH与控制信令及导频符号的共存, 且该方法实现筒单。
本发明实施例还提供一种进行下行数据传输的装置, 其组成结构如 图 10所示, 其中包括: DwPTS设置模块 1010、 映射模块 1020和下行 传输模块 1030;
所述 DwPTS设置模块 1010, 配置特殊时隙中的 DwPTS承载下行 控制信令、 P-SCH、 下行数据和下行导频符号, 所述 DwPTS至少包括 n 个 OFDM符号的长度, n为自然数且 n > 3;
所述映射模块 1020, 将所述 P-SCH映射到指定位置, 所述指定位 置包括: 时域位置为 DwPTS的第 3个 OFDM符号位置; 频域位置为系 统带宽的中间 6个子载波, 并将下行控制信令、 下行数据和下行导频符 号映射到所述 P-SCH以外的其他时频资源位置上;
所述下行传输模块 1030, 根据所述配置的 DwPTS和设定的资源映 射位置, 进行下行数据的传输。
所述映射模块 1020包括:第一 P-SCH判定单元 1021和第一控制信 令映射单元 1022;
所述第一 P-SCH 判定单元 1021 , 当所述 P-SCH 的时域位置为 DwPTS的第 3个 OFDM符号位且系统带宽大于 P-SCH带宽时, 通知第 一控制信令映射单元 1022;
所述第一控制信令映射单元 1022, 根据所述第一 P-SCH判定单元 1021的通知, 在 DwPTS的前 3个 OFDM符号位或第 1个 OFDM符号 位进行控制信令的映射。
所述映射模块 1020还包括:第二 P-SCH判定单元 1023和第二控制 信令映射单元 1024;
所述第二 P-SCH 判定单元 1023 , 当所述 P-SCH 的时域位置为 DwPTS的第 3个 OFDM符号位且系统带宽等于 P-SCH带宽时, 通知第 二控制信令映射单元 1024;
所述第二控制信令映射单元 1024, 根据所述第二 P-SCH判定单元 1023的通知, 在 DwPTS的前 2个 OFDM符号位进行控制信令的映射。
所述映射模块 1020进一步包括 DwPTS判定单元 1025;
所述 DwPTS判定单元 1025 ,当 DwPTS的长度大于等于 4个 OFDM 符号时, 通知所述第二控制信令映射单元 1024;
此时, 所述第二控制信令映射单元 1024, 用于在 DwPTS的第 4个 OFDM符号位进行控制信令的映射。
本发明实施例提供的下行传输的系统, 通过配置 DwPTS的最小长 度不小于 3个 OFDM符号位的长度, 同时将 P-SCH配置在与下行控制 信令及参考符号互不影响的时频资源位置上,实现了 P-SCH与控制信令 及导频符号的共存, 且该装置结构筒单。
应理解的是, 以上所述仅为本发明的具体实施例而已, 并不用于限 制本发明, 凡在本发明的精神和原则之内, 所做的任何修改、 等同替换 和改进等, 均应包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种下行传输的方法, 其特征在于, 该方法包括:
配置特殊时隙中的 DwPTS承载下行控制信令、 P-SCH、 下行数据 和下行导频符号, 所述 DwPTS包括 n个 OFDM符号的长度, n为自然 数且 n > 3;
将所述 P-SCH 映射到指定位置, 所述指定位置包括: 时域位置为 DwPTS的第 3个 OFDM符号位置; 频域位置为系统带宽的中间 6个子 载波, 并将下行控制信令、 下行数据和下行导频符号映射到所述 P-SCH 以外的其他时频资源位置上;
根据所述配置的 DwPTS和设定的资源映射位置, 进行下行数据的 传输。
2、 根据权利要求 1所述的方法, 其特征在于, 当所述 P-SCH的时 域位置为第 3个 OFDM符号位且系统带宽大于 P-SCH带宽时, 在前 3 个 OFDM符号位进行控制信令的映射。
3、 根据权利要求 1所述的方法, 其特征在于, 当所述 P-SCH的时 域位置为第 3个 OFDM符号位且系统带宽等于 P-SCH带宽时, 在前 2 个 OFDM符号位进行控制信令的映射。
4、 根据权利要求 3所述的方法, 其特征在于, 当所述 P-SCH的时 域位置为第 3个 OFDM符号位且系统带宽等于 P-SCH带宽时,若 DwPTS 的长度大于等于 4个 OFDM符号, 进一步在第 4个 OFDM符号位进行 控制信令的映射。
5、 一种下行传输的装置, 其特征在于, 该装置包括: DwPTS设置 模块、 映射模块和下行传输模块;
所述 DwPTS设置模块,配置特殊时隙中的 DwPTS承载下行控制信 令、 P-SCH、 下行数据和下行导频符号, 所述 DwPTS包括 n个 OFDM 符号的长度, n为自然数且 n > 3;
所述映射模块,将所述 P-SCH映射到指定位置,所述指定位置包括: 时域位置为 DwPTS的第 3个 OFDM符号位置; 频域位置为系统带宽的 中间 6个子载波, 并将下行控制信令、 下行数据和下行导频符号映射到 所述 P-SCH以外的其他时频资源位置上;
所述下行传输模块, 根据 DwPTS设置模块的设定和映射模块设定 的资源映射位置, 进行下行数据的传输。
6、 根据权利要求 5所述的装置, 其特征在于, 所述映射模块包括: 第一 P-SCH判定单元和第一控制信令映射单元;
所述第一 P-SCH判定单元, 当所述 P-SCH 的时域位置为第 3 个 OFDM符号位且系统带宽大于 P-SCH带宽时, 通知第一控制信令映射 单元;
所述第一控制信令映射单元, 根据所述第一 P-SCH 判定单元的通 知,在前 3个 OFDM符号位进行控制信令的映射,并通知下行传输模块。
7、 根据权利要求 5所述的装置, 其特征在于, 所述映射模块包括: 第二 P-SCH判定单元和第二控制信令映射单元;
所述第二 P-SCH判定单元, 当所述 P-SCH 的时域位置为第 3 个 OFDM符号位且系统带宽等于 P-SCH带宽时, 通知第二控制信令映射 单元;
所述第二控制信令映射单元, 根据所述第二 P-SCH 判定单元的通 知,在前 2个 OFDM符号位进行控制信令的映射,并通知下行传输模块。
8、 根据权利要求 7所述的装置, 其特征在于, 所述映射模块进一 步包括 DwPTS判定单元;
所述 DwPTS 判定单元, 根据所述 DwPTS 设置模块得到设置的 DwPTS的长度, 当 DwPTS的长度大于等于 4个 OFDM符号时, 通知 所述第二控制信令映射单元;
所述第二控制信令映射单元,在第 4个 OFDM符号位进行控制信令 的映射, 并通知下行传输模块。
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