WO2009065333A1 - Procédé d'envoi de canal de diffusion physique de système tdd - Google Patents

Procédé d'envoi de canal de diffusion physique de système tdd Download PDF

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Publication number
WO2009065333A1
WO2009065333A1 PCT/CN2008/072747 CN2008072747W WO2009065333A1 WO 2009065333 A1 WO2009065333 A1 WO 2009065333A1 CN 2008072747 W CN2008072747 W CN 2008072747W WO 2009065333 A1 WO2009065333 A1 WO 2009065333A1
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Prior art keywords
ofdm symbol
cyclic prefix
broadcast channel
physical broadcast
last
Prior art date
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PCT/CN2008/072747
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English (en)
French (fr)
Inventor
Bo Dai
Shuqiang Xia
Chunli Liang
Peng Hao
Liujun Hu
Bin Yu
Original Assignee
Zte Corporation
Yu, Guanghui
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Application filed by Zte Corporation, Yu, Guanghui filed Critical Zte Corporation
Priority to US12/934,976 priority Critical patent/US8743899B2/en
Priority to CN200880115382.5A priority patent/CN101855844B/zh
Priority to EP08852409.5A priority patent/EP2221994B1/en
Publication of WO2009065333A1 publication Critical patent/WO2009065333A1/zh
Priority to HK10110869.5A priority patent/HK1144341A1/xx

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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
    • H04L5/0001—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), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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 signaling, 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • 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), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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
    • H04L5/0078—Timing of allocation
    • H04L5/0087—Timing of allocation when data requirements change

Definitions

  • BACKGROUND OF THE INVENTION 1 shows a frame structure of a Frequency Division Duplex (FDD) model in a Long Time Evolution (LTE) system.
  • FDD Frequency Division Duplex
  • LTE Long Time Evolution
  • FIG. 1 a 10 ms radio frame is divided into two fields, each field is divided into 10 time slots having a length of 0.5 ms, and two time slots are formed to have a length of 1 ms.
  • Subframe which contains 5 subframes in one field.
  • the cyclic prefix When the cyclic prefix is a regular cyclic prefix, one slot contains seven uplink/downlink symbols. When the cyclic prefix is an extended cyclic prefix, one slot contains six up/down symbols, and a secondary synchronization signal is specified (Second-Synchronization)
  • S-SCH When the cyclic prefix is an extended cyclic prefix, one slot contains six up/down symbols, and a secondary synchronization signal is specified (Second-Synchronization)
  • S-SCH The channel, abbreviated as S-SCH, and the primary-synchronous signal (Primary-SCH, abbreviated as P-SCH) are set to be transmitted on the last two OFDM symbols of the first slot.
  • the cyclic prefix is a regular cyclic prefix
  • the Physical Broadcast Channel (PBCH) is the 4th OFDM symbol in the 1st slot, the 5th OFDM symbol, and the 1st OFDM in the 2nd slot.
  • TDD Time Division Duplex Time Division Duplex
  • a 10 ms radio frame is divided into two fields, each field is divided into 10 time slots having a length of 0.5 ms, and two time slots are formed into a length of 1 ms.
  • Subframe which contains 5 subframes in one field.
  • the cyclic prefix is a regular cyclic prefix
  • one slot contains 7 up/down symbols
  • the cyclic prefix is an extended cyclic prefix
  • subframe 0 is fixed for downlink transmission
  • subframe 1 is a special subframe, and includes three special time slots, respectively, DwPTS (Downlink Pilot Time) Slot, downlink pilot time slot;), GP (Guard Period), and UpPTS (Uplink) Pilot Time Slot, uplink pilot time slot ;). among them,
  • the DwPTS is used for downlink transmission, the primary synchronization signal is set to be transmitted on the first OFDM symbol in the DwPTS, and the secondary synchronization signal is set to be transmitted on the last OFDM symbol of the downlink slot adjacent to the DwPTS.
  • the GP is a guard interval and does not transmit any data.
  • UpPTS is used for uplink transmission, comprising at least 2 uplink SC-FDMA symbols for transmitting physical random access channel (Physical Random Access Channel, abbreviated as PRACH) 0
  • PRACH Physical Random Access Channel
  • FDD transmission method in the physical broadcast channel is no longer Applicable to the transmission of the physical broadcast channel in TDD:
  • the capacity of the physical broadcast channel in the TDD is larger than the capacity of the physical broadcast channel in the FDD, and the method of transmitting the physical broadcast channel in the FDD cannot meet the requirement of the physical broadcast channel capacity in the TDD;
  • the physical broadcast channel is transmitted before and after the synchronization signal. Since the frame structure of the TDD and the frame structure of the FDD are different, the transmission position of the synchronization signal is also different. Due to iHl, the transmission method of extending FDD in TDD is no longer applicable; the method of transmitting the physical broadcast channel in the FDD when the cyclic prefix is the regular cyclic prefix and the sending of the physical broadcast channel in the FDD when the cyclic prefix is the extended cyclic prefix Different methods, this also increases the complexity of the system; therefore, it is necessary to design a new physical broadcast channel transmission method for the frame structure of TDD.
  • the present invention provides a method for transmitting a physical broadcast channel of a time division duplex system in order to solve the above problem.
  • the present invention proposes a time division duplex system physical broadcast channel transmission method for the frame structure of TDD, the main feature of which is that the physical broadcast channel is transmitted at 1.08 MHz in the middle of the entire frequency band, wherein the pilot position does not transmit the physical broadcast channel.
  • Signal, whether the cyclic prefix is a regular cyclic prefix or an extended cyclic prefix the physical transmission channel in TDD uses the same transmission method; the physical broadcast channel is in a radio frame
  • the first subframe is transmitted on 4 OFDM symbols.
  • the physical broadcast channel is transmitted on four consecutive OFDM symbols of the first subframe of one radio frame, and the specific transmission has the following configurations: mode one is the fifth last OFDM symbol in the second slot, and the fourth from the last The OFDM symbol, the third last OFDM symbol, and the second last OFDM symbol are transmitted.
  • the second mode is transmitted on the first OFDM symbol, the second OFDM symbol, the third OFDM symbol, and the fourth OFDM symbol of the second slot.
  • the third method is transmitted on the second OFDM symbol of the first time slot, the first OFDM symbol of the last time slot, and the first OFDM symbol and the second OFDM symbol of the second time slot.
  • the fourth mode is transmitted on the sixth sixth OFDM symbol, the fifth last OFDM symbol, the fourth last OFDM symbol, and the third last OFDM symbol of the second slot.
  • the fifth method is transmitted on the first OFDM symbol of the first slot and the first OFDM symbol, the second OFDM symbol, and the third OFDM symbol of the second slot.
  • the sixth mode is transmitted on the third OFDM symbol, the second last OFDM symbol, the last OFDM symbol, and the first OFDM symbol of the second slot of the first slot.
  • the physical broadcast channel may also be sent on the discontinuous four OFDM symbols of the first subframe of one radio frame.
  • the specific transmission has the following configurations:
  • the first method is transmitted on the second OFDM symbol of the first time slot and the first OFDM symbol, the second OFDM symbol, and the third last OFDM symbol of the third time slot.
  • Mode 2 the first OFDM symbol in the first time slot, the second OFDM symbol in the last, and the second
  • the third OFDM symbol of the two slots and the second OFDM symbol are transmitted on the last.
  • the above methods make full use of the characteristics of the TDD frame structure, can be used in TDD applications, and can meet the requirements of physical broadcast channel capacity expansion in TDD, and at the same time, the same transmission method is used for the conventional cyclic prefix and the extended cyclic prefix. , also reduced the complexity of the system.
  • FIG. 1 is a schematic diagram of a frame structure of an LTE system FDD
  • FIG. 2 is a schematic diagram of a frame structure of an LTE system TDD
  • FIG. 3 to FIG. 12 are schematic diagrams of specific transmission embodiments of a physical broadcast channel in an LTE system TDD.
  • a physical broadcast channel is transmitted at 1.08 MHz in the middle of the entire frequency band, wherein the pilot position
  • the signal of the physical broadcast channel is not transmitted, whether the cyclic prefix is a regular cyclic prefix or an extended cyclic prefix, and the physical broadcast channel in the TDD uses the same transmission method; the physical broadcast channel has 4 OFDM symbols in the first subframe of one radio frame.
  • the above technical solution fully utilizes the characteristics of the TDD frame structure, can meet the requirement of the physical broadcast channel capacity expansion in the TDD, and is the same as the conventional cyclic prefix and the extended cyclic prefix.
  • the method of sending reduces the complexity of the system.
  • some specific embodiments including the signal transmitting method of the present invention are given below with reference to Figures 3-12.
  • the physical broadcast channel occupies a 1.08 MHz system bandwidth centered on the zero frequency in the frequency domain, and the transmission position is in the first subframe of a radio frame, and FIG. 3-6 shows the physical broadcast in the first subframe.
  • Channel specific transmission time At this time, the first subframe contains two slots (the first slot and the second slot in the radio frame).
  • R1 represents the pilot on the first antenna port
  • R2 represents the pilot on the second antenna port
  • R3 represents the pilot on the third antenna port
  • R4 represents the fourth.
  • the pilot on the antenna port, the shaded portion represents the physical broadcast channel.
  • 3 is a schematic diagram of a transmission embodiment of a physical broadcast channel in an TDD of an LTE system.
  • the cyclic prefix is a regular cyclic prefix, and the physical channel is on the last 5th OFDM symbol of the 2nd slot, the 4th OFDM symbol, the 3rd OFDM symbol, and the 2nd OFDM symbol send.
  • 4 is a schematic diagram of a transmission embodiment of a physical broadcast channel in an TDD of an LTE system.
  • the cyclic prefix is an extended cyclic prefix, and the physical channel is on the last 5th OFDM symbol of the 2nd slot, the 4th OFDM symbol, the 3rd OFDM symbol, and the 2nd OFDM symbol send.
  • 5 is a schematic diagram of a transmission embodiment of a physical broadcast channel in an TDD of an LTE system.
  • the cyclic prefix is a regular cyclic prefix, and the physical channel is transmitted on the 1st OFDM symbol, the 2nd OFDM symbol, the 3rd OFDM symbol, and the 4th OFDM symbol of the 2nd slot.
  • 6 is a schematic diagram of a transmission embodiment of a physical broadcast channel in an LTE system TDD.
  • the cyclic prefix is an extended cyclic prefix, and the physical channel is transmitted on the first OFDM symbol, the second OFDM symbol, the third OFDM symbol, and the fourth OFDM symbol of the second slot.
  • 7 is a schematic diagram of a transmission embodiment of a physical broadcast channel in an LTE system TDD.
  • the cyclic prefix is a regular cyclic prefix
  • the physical channel is the second OFDM symbol of the first time slot, the first OFDM symbol of the last time, and the first OFDM symbol of the second time slot. Number, transmitted on the 2nd OFDM symbol.
  • Figure 8 is a schematic diagram of a transmission embodiment of a physical broadcast channel in TDD of an LTE system.
  • the cyclic prefix is a regular cyclic prefix
  • the physical channel is on the sixth 6th OFDM symbol, the fifth last OFDM symbol, the fourth last OFDM symbol, and the third last OFDM symbol of the second time slot. send.
  • the cyclic prefix is a regular cyclic prefix
  • the physical channel is in the first OFDM symbol of the first slot and the first OFDM symbol of the second slot, the second OFDM symbol, and the third Transmitted on OFDM symbols.
  • Figure 10 is a schematic diagram of a transmission embodiment of a physical broadcast channel in TDD of an LTE system.
  • the cyclic prefix is a regular cyclic prefix
  • the physical channel is in the third OFDM symbol of the first time slot, the second OFDM symbol of the last, the first OFDM symbol of the last OFDM symbol, and the second time slot. Transmitted on 1 OFDM symbol.
  • the cyclic prefix is a regular cyclic prefix
  • the physical channel is in the third OFDM symbol of the first slot and the first OFDM symbol of the second slot, the second OFDM symbol, and the third last Transmitted on OFDM symbols.
  • Figure 12 is a schematic diagram of a transmission embodiment of a physical broadcast channel in TDD of an LTE system.
  • the cyclic prefix is a regular cyclic prefix
  • the physical channel is in the first OFDM symbol of the first time slot, the second OFDM symbol of the last and the third OFDM symbol of the second time slot, and the last number Transmitted on 2 OFDM symbols.
  • the present invention transmits a physical broadcast channel over 1.08 MHz in the middle of the entire frequency band, wherein the pilot position does not transmit the signal of the physical broadcast channel, whether the cyclic prefix is a regular cyclic prefix or an extended cyclic prefix, in the TDD
  • the physical broadcast channel uses the same transmission method; the physical broadcast channel is transmitted on 4 OFDM symbols in the first subframe of one radio frame, and the above problem is solved by iHl.
  • the above technical solution fully utilizes the characteristics of the TDD frame structure, can meet the requirement of the physical broadcast channel capacity expansion in the TDD, and reduces the complexity of the system because the conventional cyclic prefix and the extended cyclic prefix use the same transmission method.

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Description

时分双工系统物理广插^ [言道的发送方法 技术领域 本发明涉及移动通信领域，特别是涉及一种时分双工系统中物理广播信 道的发送方法。 背景技术 图 1示出了长期演进 ( Long Time Evolution, 简称为 LTE ) 系统中频分 双工方式（Frequency Division Duplex, 简称为 FDD )模型的帧结构。 在这种 帧结构中， 如图 1所示， 一个 10ms 的无线帧被分成两个半帧， 每个半帧分 成 10个长度为 0.5ms的时隙， 两个时隙组成一个长度为 1ms的子帧， 一个 半帧中包含 5个子帧。 当循环前缀为常规循环前缀时， 一个时隙包含 7个上 /下行符号， 当循环前缀为扩展循环前缀时， 一个时隙包含 6个上 /下行符号， 并且， 规定辅同步信号 （Second-Synchronization Channel, 简称为 S-SCH ) 和主同步信号 （Primary-SCH, 简称为 P-SCH )设置在第 1 个时隙的最后两 个 OFDM 符号上进行传输。 当循环前缀为常规循环前缀时， 物理广播信道 ( Physical Broadcast Channel, 简称为 PBCH )在第 1个时隙的第 4个 OFDM 符号、第 5个 OFDM符号和第 2个时隙的第 1个 OFDM符号、第 2个 OFDM 符号上发送； 当循环前缀为扩展循环前缀时， 物理广播信道在第 1个时隙的 第 4个 OFDM符号和第 2个时隙的第 1个 OFDM符号、第 2个 OFDM符号、 第 3个 OFDM符号上发送。 图 2示出了 LTE系统中时分双工方式 （Time Division Duplex, 简称为
TDD )模型的帧结构。 在这种帧结构中， 如图 2所示， 一个 10ms的无线帧 被分成两个半帧， 每个半帧分成 10个长度为 0.5ms的时隙， 两个时隙组成一 个长度为 lms的子帧， 一个半帧中包含 5个子帧。 当循环前缀为常规循环前 缀时， 一个时隙包含 7个上 /下行符号， 当循环前缀为扩展循环前缀时， 一个 时隙包含 6个上 /下行符号。如图 2所示，这种帧结构中的子帧的配置特点为： 子帧 0固定用于下行传输； 子帧 1为特殊子帧， 包含 3个特殊时隙，分别是 DwPTS ( Downlink Pilot Time Slot, 下行导频时隙；)、 GP ( Guard Period, 保护间隔）及 UpPTS ( Uplink Pilot Time Slot , 上行导频时隙；)。 其中，
DwPTS用于下行传输， 主同步信号设置在 DwPTS 中的第一个 OFDM 符号上发送，辅同步信号设置在与 DwPTS相邻的下行时隙的最后一个 OFDM 符号上发送。 GP为保护间隔， 不传输任何数据。
UpPTS用于上行传输， 包含至少 2个上行 SC-FDMA符号用于传输物 理随机接入信道 ( Physical Random Access Channel , 简称为 PRACH )0 从以下几方面可以说明 FDD中物理广播信道的发送方法已经不适用于 TDD中物理广播信道的发送： TDD中物理广播信道容量需求比 FDD中物理广播信道的容量大， FDD 中物理广播信道的发送方法已经不能满足 TDD中物理广播信道容量的需求；
FDD 中为了利用同步信号做信道估计， 令物理广播信道在同步信号前 后发送， 由于 TDD的帧结构和 FDD的帧结构不同， 同步信号的发送位置也 不同。 因 iHl , 在 TDD中再延用 FDD的发送方法已经不再适用； 循环前缀为常规循环前缀时的 FDD中物理广播信道的发送方法与循环 前缀为扩展循环前缀时的 FDD 中物理广播信道的发送方法不同， 这也增力口 了系统的复杂度； 因此， 针对 TDD的帧结构中， 设计一种新的物理广播信道发送方法是 很有必要的。 发明内容 针对目前没有适合 TDD中物理广播信道的发送方法， 本发明提供了一 种时分双工系统物理广播信道发送方法， 以解决上述问题。 本发明针对 TDD的帧结构提出了一种时分双工系统物理广播信道发送 方法， 其主要特征在于： 物理广播信道在整个频带的中间 1.08MHz上发送， 其中， 导频位置不 发送物理广播信道的信号， 无论循环前缀为常规循环前缀， 还是扩展循环前 缀， TDD中物理广播信道釆用相同的发送方法； 物理广播信道在一个无线帧 的第 1个子帧中 4个 OFDM符号上发送。 物理广播信道在一个无线帧的第 1个子帧的连续四个 OFDM符号上发 送， 具体的发送有以下几种配置： 方式一 在第 2个时隙的倒数第 5个 OFDM符号、 倒数第 4个 OFDM符号、 倒 数第 3个 OFDM符号和倒数第 2个 OFDM符号上发送。 方式二 在第 2个时隙的第 1个 OFDM符号、第 2个 OFDM符号、第 3个 OFDM 符号和第 4个 OFDM符号上发送。 方式三 在第 1个时隙的倒数第 2个 OFDM符号、倒数第 1个 OFDM符号和第 2个时隙的第 1个 OFDM符号、 第 2个 OFDM符号上发送。 方式四 在第 2个时隙的倒数第 6个 OFDM符号、 倒数第 5个 OFDM符号、 倒 数第 4个 OFDM符号和倒数第 3个 OFDM符号上发送。 方式五 在第 1个时隙的倒数第 1个 OFDM符号和第 2个时隙的第 1个 OFDM 符号、 第 2个 OFDM符号、 第 3个 OFDM符号上发送。 方式六 在第 1个时隙的倒数第 3个 OFDM符号、 倒数第 2个 OFDM符号、 倒 数第 1个 OFDM符号和第 2个时隙的第 1个 OFDM符号上发送。 或者， 物理广播信道也可以在一个无线帧的第 1 个子帧的不连续的四个 OFDM符号上发送， 具体的发送有以下几种配置： 方式一 在第 1个时隙的倒数第 2个 OFDM符号和第 3个时隙的第 1个 OFDM 符号、 第 2个 OFDM符号、 倒数第 3个 OFDM符号上发送。 方式二 在第 1个时隙的倒数第 1个 OFDM符号、倒数第 2个 OFDM符号和第
2个时隙的第 3个 OFDM符号和倒数第 2个 OFDM符号上发送。 以上方法都充分利用了 TDD帧结构的特点， 可以 艮好的在 TDD应用， 并且， 可以满足 TDD 中物理广播信道容量扩展的需求， 同时， 由于常规循 环前缀和扩展循环前缀釆用相同的发送方法， 也降氐了系统的复杂度。 附图说明 此处所说明的附图用来提供对本发明的进一步理解 ,构成本申请的一部 分， 本发明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的 不当限定。 在附图中： 图 1为 LTE系统 FDD的帧结构示意图； 图 2为 LTE系统 TDD的帧结构示意图； 图 3〜图 12为 LTE系统 TDD中物理广播信道的具体发送实施例的示意 图。 具体实施方式 功能相无述 针对目前没有适合 TDD中物理广播信道的发送方法的问题， 在本实施 例提供的技术方案中， 物理广播信道在整个频带的中间 1.08MHz上发送， 其 中， 导频位置不发送物理广播信道的信号， 无论循环前缀为常规循环前缀， 还是扩展循环前缀， TDD中物理广播信道釆用相同的发送方法； 物理广播信 道在一个无线帧的第 1个子帧中 4个 OFDM符号上发送，以此解决了上述问 题。 上述技术方案， 充分利用了 TDD帧结构的特点， 能够满足 TDD中物理 广播信道容量扩展的需求， 并且由于常规循环前缀和扩展循环前缀釆用相同 的发送方法， 降低了系统的复杂度。 为了便于深刻理解本发明， 下面结合附图 3-12,给出包含本发明信号发 送方法的一些具体实施例。 其中， 物理广播信道在频域上占有以零频为中心 的 1.08MHz系统带宽， 发射位置在一个无线帧的第 1个子帧， 附图 3-6给出 了在第 1个子帧中， 物理广播信道具体的发射时刻， 此时， 第 1个子帧包含 两个时隙 （无线帧中的第 1 个时隙和第 2个时隙）， 当循环前缀为常规循环 前缀时， 一个时隙包含 7个符号， 当循环前缀为扩展循环前缀时， 一个时隙 包含 6个符号，在第 1个子帧中的最后一个符号上发送辅同步信号。在图 3-12 中， R1表示第一才艮天线端口上的导频， R2表示第二才艮天线端口上的导频， R3表示第三才艮天线端口上的导频， R4表示第四才艮天线端口上的导频， 阴影 部分表示物理广播信道。 附图 3为 LTE系统 TDD中物理广播信道的一种发送实施例的示意图。 在该实施例中， 循环前缀为常规循环前缀， 物理信道在第 2个时隙的倒数第 5个 OFDM符号、 倒数第 4个 OFDM符号、 倒数第 3个 OFDM符号和倒数 第 2个 OFDM符号上发送。 附图 4为 LTE系统 TDD中物理广播信道的一种发送实施例的示意图。 在该实施例中， 循环前缀为扩展循环前缀， 物理信道在第 2个时隙的倒数第 5个 OFDM符号、 倒数第 4个 OFDM符号、 倒数第 3个 OFDM符号和倒数 第 2个 OFDM符号上发送。 附图 5为 LTE系统 TDD中物理广播信道的一种发送实施例的示意图。 在该实施例中， 循环前缀为常规循环前缀， 物理信道在第 2个时隙的第 1个 OFDM符号、 第 2个 OFDM符号、 第 3个 OFDM符号和第 4个 OFDM符号 上发送。 附图 6为 LTE系统 TDD中物理广播信道的一种发送实施例的示意图。 在该实施例中， 循环前缀为扩展循环前缀， 物理信道在第 2个时隙的第 1个 OFDM符号、 第 2个 OFDM符号、 第 3个 OFDM符号和第 4个 OFDM符号 上发送。 附图 7为 LTE系统 TDD中物理广播信道的一种发送实施例的示意图。 在该实施例中， 循环前缀为常规循环前缀， 物理信道在第 1个时隙的倒数第 2个 OFDM符号、 倒数第 1个 OFDM符号和第 2个时隙的第 1个 OFDM符 号、 第 2个 OFDM符号上发送。
附图 8为 LTE系统 TDD中物理广播信道的一种发送实施例的示意图。 在该实施例中， 循环前缀为常规循环前缀， 物理信道在第 2个时隙的倒数第 6个 OFDM符号、 倒数第 5个 OFDM符号、 倒数第 4个 OFDM符号和倒数 第 3个 OFDM符号上发送。
附图 9为 LTE系统 TDD中物理广播信道的一种发送实施例的示意图。 在该实施例中， 循环前缀为常规循环前缀， 物理信道在第 1个时隙的倒数第 1个 OFDM符号和第 2个时隙的第 1个 OFDM符号、 第 2个 OFDM符号、 第 3个 OFDM符号上发送。
附图 10为 LTE系统 TDD中物理广播信道的一种发送实施例的示意图。 在该实施例中， 循环前缀为常规循环前缀， 物理信道在第 1个时隙的倒数第 3个 OFDM符号、 倒数第 2个 OFDM符号、 倒数第 1个 OFDM符号和第 2 个时隙的第 1个 OFDM符号上发送。
附图 11为 LTE系统 TDD中物理广播信道的一种发送实施例的示意图。 在该实施例中， 循环前缀为常规循环前缀， 物理信道在第 1个时隙的倒数第 3个 OFDM符号和第 2个时隙的第 1个 OFDM符号、 第 2个 OFDM符号、 倒数第 3个 OFDM符号上发送。
附图 12为 LTE系统 TDD中物理广播信道的一种发送实施例的示意图。 在该实施例中， 循环前缀为常规循环前缀， 物理信道在第 1个时隙的倒数第 1个 OFDM符号、倒数第 2个 OFDM符号和第 2个时隙的第 3个 OFDM符 号和倒数第 2个 OFDM符号上发送。
综上所述， 本发明通过将物理广播信道在整个频带的中间 1.08MHz上 发送， 其中， 导频位置不发送物理广播信道的信号， 无论循环前缀为常规循 环前缀， 还是扩展循环前缀， TDD中物理广播信道釆用相同的发送方法； 物 理广播信道在一个无线帧的第 1个子帧中 4个 OFDM符号上发送，以 iHl解决 了上述问题。上述技术方案，充分利用了 TDD帧结构的特点， 能够满足 TDD 中物理广播信道容量扩展的需求， 并且由于常规循环前缀和扩展循环前缀釆 用相同的发送方法， 降低了系统的复杂度。
以上所述仅为本发明的实施例而已， 并不用于限制本发明， 对于本领域 的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则 之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的权利要求 范围之内。

Claims

权 利 要 求 书
1. 一种时分双工系统物理广播信道的发送方法， 其特征在于：
导频位置不发送物理广播信道的信号，物理广播信道的信号在一个 无线帧的第 1个子帧中的 4个 OFDM符号上发送。
2. 根据权利要求 1 所述的方法， 其特征在于： 物理广播信道在整个频带的中间 1.08MHz上发送。
3. 根据权利要求 1所述的方法， 其特征在于： 物理广播信道是在一个无线帧的第 1个子帧的连续四个 OFDM符号上发送。
4. 根据权利要求 3所述的方法， 其特征在于： 当循环前缀是常规循环前缀或者是 扩展循环前缀时， 所述物理广播信道在无线帧的第 1个子帧的连续四个 OFDM 符号上发送的位置为：
第 2个时隙的倒数第 5个 OFDM符号、 倒数第 4个 OFDM符号、 倒数第 3个 OFDM符号和倒数第 2个 OFDM符号。
5. 根据权利要求 3所述的方法， 其特征在于： 当循环前缀是常规循环前缀或者是 扩展循环前缀时， 所述物理广播信道在无线帧的第 1个子帧的连续四个 OFDM 符号上发送的位置为：
在第 2个时隙的第 1个 OFDM符号、 第 2个 OFDM符号、 第 3个 OFDM符号和第 4个 OFDM符号。
6. 根据权利要求 3所述的方法， 其特征在于： 当循环前缀是常规循环前缀或者是 扩展循环前缀时， 所述物理广播信道在无线帧的第 1个子帧的连续四个 OFDM 符号上发送的位置为：
在第 1个时隙的倒数第 2个 OFDM符号、 倒数第 1个 OFDM符号 和第 2个时隙的第 1个 OFDM符号、 第 2个 OFDM符号。
7. 根据权利要求 3所述的方法， 其特征在于： 当循环前缀是常规循环前缀或者是 扩展循环前缀时， 所述物理广播信道在无线帧的第 1个子帧的连续四个 OFDM 符号上发送的位置为： 在第 2个时隙的倒数第 6个 OFDM符号、倒数第 5个 OFDM符号、 倒数第 4个 OFDM符号和倒数第 3个 OFDM符号。
8. 根据权利要求 3所述的方法， 其特征在于： 当循环前缀是常规循环前缀或者是 扩展循环前缀时， 所述物理广播信道在无线帧的第 1个子帧的连续四个 OFDM 符号上发送的位置为：
在第 1 个时隙的倒数第 1 个 OFDM符号和第 2个时隙的第 1 个 OFDM符号、 第 2个 OFDM符号、 第 3个 OFDM符号。
9. 根据权利要求 3所述的方法， 其特征在于： 当循环前缀是常规循环前缀或者是 扩展循环前缀时， 所述物理广播信道在无线帧的第 1个子帧的连续四个 OFDM 符号上发送的位置为：
在第 1个时隙的倒数第 3个 OFDM符号、倒数第 2个 OFDM符号、 倒数第 1个 OFDM符号和第 2个时隙的第 1个 OFDM符号。
10. 根据权利要求 1所述的方法， 其特征在于： 物理广播信道是在无线帧的第 1个 子帧的不连续的四个 OFDM符号上发送。
11. 根据权利要求 10所述的方法，其特征在于： 当循环前缀是常规循环前缀或者是 扩展循环前缀时， 所述物理广播信道在无线帧的第 1 个子帧的不连续四个 OFDM符号上发送的位置为：
在第 1 个时隙的倒数第 3个 OFDM符号和第 2个时隙的第 1 个 OFDM符号、 第 2个 OFDM符号、 倒数第 3个 OFDM符号。
12. 根据权利要求 10所述的方法，其特征在于： 当循环前缀是常规循环前缀或者是 扩展循环前缀时， 所述物理广播信道在无线帧的第 1 个子帧的不连续四个 OFDM符号上发送的位置为：
在第 1个时隙的倒数第 1个 OFDM符号、 倒数第 2个 OFDM符号 和第 2个时隙的第 3个 OFDM符号和倒数第 2个 OFDM符号。
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CN101159488B (zh) 2013-06-05
CN101855844B (zh) 2013-08-21
US20110096702A1 (en) 2011-04-28
EP2221994B1 (en) 2015-12-09
US8743899B2 (en) 2014-06-03
EP2221994A1 (en) 2010-08-25

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