WO2008025274A1 - Station de base et procédé pour transmettre la signalisation de commande de liaison descendante utilisée par la station de base - Google Patents

Station de base et procédé pour transmettre la signalisation de commande de liaison descendante utilisée par la station de base Download PDF

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Publication number
WO2008025274A1
WO2008025274A1 PCT/CN2007/070423 CN2007070423W WO2008025274A1 WO 2008025274 A1 WO2008025274 A1 WO 2008025274A1 CN 2007070423 W CN2007070423 W CN 2007070423W WO 2008025274 A1 WO2008025274 A1 WO 2008025274A1
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WO
WIPO (PCT)
Prior art keywords
control signaling
dedicated control
base station
dedicated
data
Prior art date
Application number
PCT/CN2007/070423
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English (en)
Chinese (zh)
Inventor
Shaohui Sun
Shiqiang Suo
Yingmin Wang
Original Assignee
Da Tang Mobile Communications Equipment Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Da Tang Mobile Communications Equipment Co., Ltd. filed Critical Da Tang Mobile Communications Equipment Co., Ltd.
Publication of WO2008025274A1 publication Critical patent/WO2008025274A1/fr

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Classifications

    • 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
    • H04L5/0001—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
    • 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
    • H04L5/14—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

Definitions

  • the present invention relates to the field of communication technologies, and more particularly to a base station in a broadband time division duplex cellular system and a method of transmitting downlink control signaling.
  • Time Division Synchronous Code Division Multiple Access is the only third-generation mobile communication system that uses Time Division Duplex (TDD) in the three major international standards. It supports uplink and downlink asymmetric service transmission and has better spectrum utilization. Great flexibility.
  • the system combines advanced technologies in wireless communications such as smart antennas, uplink synchronization, joint detection and software radio to provide high performance and spectrum utilization.
  • TD-SCDMA systems With the development of society and the advancement of technology, people's requirements for mobile communication are constantly increasing. It is hoped that the system can provide high-capacity, high-rate, low-latency data transmission services. To meet this growing demand, TD-SCDMA systems also need to evolve and improve performance.
  • each wireless subframe consists of seven normal time slots and three special time slots.
  • the common time slot is TS0 ⁇ TS6, which is used for transmitting data
  • the three special time slots are respectively downlink pilot channel (DwPTS), used for transmitting downlink synchronization information of the system, and the uplink pilot channel (UpPTS) is used for
  • DwPTS downlink pilot channel
  • UpPTS uplink pilot channel
  • GP protection guard time slot
  • the existing TD-SCMDA system is a system with a chip rate of 1.28 Mcps and a bandwidth of 1.6 MHz.
  • the data portion and the pilot portion of the uplink and downlink use the same signal format.
  • the bandwidth can be above 20MHz, and it can support different bandwidths of 1.25MHz, 2.5MHz, 5MHz, 10MHz and 20MHz.
  • the TD-SCMDA system uses Code Division Multiple Access (CDMA) as a multiple access method, and its resources are based on the concept of time slots and code channels.
  • CDMA Code Division Multiple Access
  • the downlink modulation method can adopt the Orthogonal Frequency Division Multiplexing (OFDM) method.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the OFDM method has been applied in broadband wireless local area networks, and applications in cellular mobile communication still need to solve a series of problems.
  • UE user equipment
  • the invention provides a base station in a broadband time division duplex cellular system and a method for transmitting the downlink control signaling, and implements downlink control signaling transmission in a broadband time division duplex cellular system, so that the user terminal can receive the fast and timely , demodulation control signaling.
  • the invention provides a method for transmitting downlink control signaling in a broadband time division duplex cellular system, including:
  • the common control signaling in the downlink control signaling is multiplexed with the dedicated control signaling and the transmission data in the downlink control signaling by using a time division multiplexing (TDM) method;
  • TDM time division multiplexing
  • the dedicated control signaling is multiplexed with the transmitted data by a frequency division multiplexing (FDM) method.
  • the downlink modulation mode is an orthogonal frequency division multiplexing OFDM modulation mode;
  • the step of multiplexing the common control signaling in the downlink control signaling with the dedicated control signaling and the sending data in the downlink control signaling by using the time division multiplexing TDM method includes:
  • All or part of resources occupying the first or second OFDM symbols transmit common control signaling; occupying other OFDM symbols or common control signaling, transmitting data and dedicated control of remaining subcarrier resources in the first or second OFDM symbols Signaling
  • the step of multiplexing the dedicated control signaling with the transmit data by using a frequency division multiplexing FDM method includes:
  • the dedicated control signaling and the transmission data are transmitted in the same transmission resource block, and the channel resources occupied by the dedicated control signaling are distributed in different subcarriers within the OFDM symbols for transmitting data.
  • the common control signaling is transmitted by joint coding or separately coding.
  • the dedicated control signaling uses adaptive code modulation (AMC, adaptive modulation and Coding ) or send it separately.
  • AMC adaptive code modulation
  • the method further includes the user terminal demodulating the received downlink common control signaling with a common pilot symbol.
  • the method further includes demodulating the received downlink dedicated control signaling with the dedicated pilot symbols by the user terminal.
  • a base station in a broadband time division duplex cellular system includes: an OFDM modulation apparatus,
  • the OFDM modulation apparatus multiplexes the common control signaling with the dedicated control signaling and the transmission data by using the TDM method, and multiplexes the dedicated control signaling with the transmission data by using FDM.
  • the OFDM modulation apparatus may include:
  • An encoding unit for encoding common control signaling, dedicated control signaling, and transmission data to be transmitted;
  • a modulation unit that modulates the encoded common control signaling, dedicated control signaling, transmission data, and pilot symbols that need to be transmitted to the UE;
  • a frequency domain subcarrier multiplexing unit that performs frequency domain multiplexing on the received modulated signal; and, the frequency domain subcarrier multiplexing unit uses the time division multiplexing TDM method to transmit and transmit the common control signaling and dedicated control signaling
  • the data is multiplexed, and the dedicated control signaling is multiplexed with the transmitted data by using a frequency division multiplexing FDM method;
  • a Fourier transform unit that performs frequency-time conversion on the received frequency domain signal
  • the CP processing unit that sends the time domain signal to the radio frequency transmitting unit of the base station after adding the cyclic prefix (CP) processing.
  • the coding unit uses joint coding or separate coding for the common control signaling.
  • the coding unit separately encodes the dedicated control signaling.
  • the present invention multiplexes the common control signaling with dedicated control signaling and transmission data by using a TDM method, and multiplexes the dedicated control signaling and the transmission data by using a frequency division multiplexing FDM method to enable the UE.
  • the common control signaling can be quickly received, and the location of the transmission resource of the service data can be obtained, so that the control information can be quickly reacted and processed, and resources for control signaling and terminal battery consumption are saved. If some UEs receive the common control signaling and know that there is no data sent to it in this time slot, it may not receive other data in the time slot, thereby saving battery overhead.
  • Public control The signaling is demodulated using common pilot symbols, thus ensuring that UEs within the cell can receive it.
  • FIG. 1 is a schematic diagram of a frame structure of a conventional TD-SCMDA system
  • 2 is a schematic diagram of channel resources in an OFDM modulation mode
  • FIG. 3 is a schematic diagram of downlink control signaling transmission according to the present invention.
  • FIG. 4 is a schematic diagram of an OFDM modulation apparatus embodying the present invention.
  • a channel resource using OFDM modulation is composed of a time domain and a frequency domain.
  • channel resources are divided into certain time segments, which are referred to herein as time.
  • the slot is composed of a plurality of OFDM symbols in the time domain in each time slot; and in the frequency domain, each OFDM symbol includes a plurality of subcarriers, each of which occupies the same bandwidth.
  • the pilot symbols are divided into common pilot symbols and dedicated pilot symbols, which are received by all UEs and used for control channel and data demodulation.
  • the dedicated pilot symbols are typically received by a particular one or more UEs and used for demodulation of control channels and transmission traffic data.
  • each resource block for OFDM modulation mode, its resources generally consist of one time-frequency domain resource block, and one time-frequency domain resource block includes Nt OFDM symbols and Nf sub-carriers, which may be simply referred to as resources.
  • Block placing the common pilot symbols in the first or second OFDM symbol, the common pilot symbols are transmitted in the entire OFDM symbol system frequency band, and are evenly distributed in the subcarriers, and the distribution density is fixed according to system requirements or Tune settings.
  • the dedicated pilot symbols can be transmitted in the entire system transmission band or in some frequency bands as needed. For example, in the OFDM modulation mode, if the smart antenna beamforming technology is used to transmit data in some frequency bands, dedicated pilot symbols can be placed in this frequency band, and the dedicated pilot symbols are combined with the transmission data for receiving. Demodulation of the end data.
  • Downlink control signaling includes common control signaling and dedicated control signaling.
  • the common control signaling is sent by the base station and can be received by all UEs in the cell.
  • the common control signaling may include an ID number of a certain UE or a group of UEs, used to transmit resources allocated by the service data, and a manner of transmitting the service data, such as multiple input multiple output (MIMO) mode or transmit diversity mode, Single antenna mode or smart antenna beamforming to send data.
  • the dedicated control signaling may include a coding rate, digital modulation, and hybrid automatic retransmission for indicating that a certain UE or a group of UEs transmit service data. ARQ, HARQ) and other information.
  • the common control signaling and the dedicated control signaling are not limited to the above information, and may also include other information.
  • the invention multiplexes common control signaling with dedicated control signaling and transmission data in a broadband time division duplex cellular system, and uses dedicated frequency division multiplexing (FDM) for dedicated control. Signaling is multiplexed with the transmitted data.
  • FDM frequency division multiplexing
  • the common control signaling is placed in the first one or two OFDM symbols of each OFDM channel resource, and the data in the slot resource block and the resources of the dedicated control signaling are multiplexed in TDM mode. That is, all or part of the resources occupying the first or second OFDM symbols transmit common control signaling.
  • the common control signaling since the common control signaling is limited, it is not necessary to occupy all the subcarriers of the entire OFDM symbol. Therefore, the data and dedicated control signaling may utilize other OFDM symbols or common control signaling in the first or second OFDM symbols. Sent in the remaining subcarrier resources.
  • the advantage of the TDM method for public control signaling is that the UE can quickly receive the public control signaling and obtain the location of the transmission resource of its service data, so that the service data can be received quickly. If some UEs receive the common control signaling and know that there is no data sent to it in this time slot, it may not receive other data in this time slot, thereby saving battery overhead.
  • the common control signaling utilizes common pilot symbols for demodulation, thus ensuring that the UEs within the cell can receive the signaling.
  • the common control signaling can use joint coding or separate coding.
  • the so-called joint coding means that different common control signalings of multiple UEs are combined and generated by channel coding to generate the same channel coded codeword.
  • This coding method can obtain a larger channel gain at the time of decoding because the generated codeword is longer, and can also reduce the overhead of the cyclic redundancy detection bit (CRC) of the signaling.
  • Separate coding refers to a method in which a UE or a plurality of UEs that use the same shared information separately encode the shared information. ⁇
  • Separate coding can be used to perform power control at the time of transmission to improve reception performance.
  • the dedicated control signaling may be multiplexed with the transmission data by using the FDM method, that is, the dedicated control signaling and the transmission data are transmitted in the same transmission resource block, and the channel resources occupied by the dedicated control signaling are distributed for multiple transmissions.
  • the dedicated control signal is only sent to a specific UE, when the data is transmitted by the smart antenna, the same shaping technology as the data can be used, the receiving performance is improved, and the channel resources for transmitting the control signaling are reduced.
  • the dedicated control signaling can be transmitted in the AMC mode, and the appropriate modulation and coding mode is selected according to the channel conditions of the time-frequency resource block in which the signaling is sent, so that the resource overhead can be further reduced. High resource utilization.
  • dedicated control signaling is used in a separate coding mode to improve reception performance through power control and other methods.
  • FIG. 3 is a schematic diagram of the downlink control signaling transmission implemented by the present invention when the OFDM-based broadband time division duplex cellular system uses the smart antenna beamforming technology for data transmission.
  • R1 is a common pilot symbol
  • AR1 and AR2 are dedicated pilot symbols
  • A is a common control signaling
  • B is dedicated control signaling
  • a part without a symbol indicates service data to be transmitted, which is referred to as sending data.
  • the common control signaling is transmitted in the first OFDM, and the TDM is multiplexed with the data and dedicated signaling. Common control signaling is combined or separately encoded and demodulated using common pilot symbols.
  • Dedicated pilot symbols and data, dedicated control signaling are transmitted using smart antenna beamforming, and are used for data and dedicated signaling demodulation.
  • Dedicated control signaling and transmission data are multiplexed in FDM mode and dispersed in the second to ninth OFDM transmission.
  • Dedicated signaling is transmitted in a separate encoding.
  • the present invention further provides a base station based on an OFDM modulation method in a broadband time division duplex cellular system, the base station including an OFDM modulation apparatus 40, and the OFDM modulation apparatus 40 adopts a TDM method.
  • the common control signaling is multiplexed with the dedicated control signaling and the transmitted data;
  • the dedicated control signaling is multiplexed with the transmitted data by using FDM.
  • the OFDM modulation apparatus 40 of the present invention includes an encoding unit 41, a modulating unit 42, a frequency domain subcarrier multiplexing unit 43, an Fourier transform (IFFT) unit 44, and a cyclic add prefix (CP) unit 45.
  • the encoding unit 41 is configured to encode downlink control signaling (including common control signaling and dedicated control signaling) and transmission data to be transmitted, and then send the data to the modulating unit 42, and the modulating unit 42 performs the received downlink after the encoding.
  • the control signaling and the transmission data and the pilot symbols that need to be sent to the UE are modulated and then sent to the frequency domain subcarrier multiplexing unit 43.
  • the frequency domain subcarrier multiplexing unit 43 performs frequency domain multiplexing on the received modulated signal and then transmits the same.
  • the IFFT unit 44 performs frequency-frequency conversion on the received frequency domain signal, generates a time domain signal, and sends it to the adding CP unit 45.
  • the adding CP unit 45 adds the CP to the received time domain signal, and then sends the signal.
  • a radio frequency transmitting unit to a base station.
  • the frequency domain subcarrier multiplexing unit 43 multiplexes the common control signaling with the dedicated control signaling and the transmission data by using a time division multiplexing TDM method, and uses the frequency division multiplexing FDM method to use the dedicated control signal. It is multiplexed with the transmitted data.
  • the encoding unit 41 may use joint coding or separate coding for the common control signaling, Dedicated control signaling can be encoded separately.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé pour la transmission de signalisation de commande de liaison descendante dans le système cellulaire TDD à bande large. Le procédé comprend les étapes suivantes : la station de base adopte l'OFDM pour moduler le genre d'accès multiple, la signalisation de commande de liaison descendante comprend la signalisation de commande commune et la signalisation de commande dédiée; et la station de base adopte le TDM pour multiplexer la signalisation de commande commune avec la signalisation de commande dédiée et les données d'envoi, et adopte le FDM pour multiplexer la signalisation de commande dédiée avec les données d'envoi. Au même moment, une station de base dans le système cellulaire TDD à bande large est obtenue. Le procédé et la station de base peuvent être appliqués au système TDD, et ils résolvent efficacement la transmission de liaison descendante dans le système cellulaire TDD à bande large, et ils permettant à l'UE d'obtenir précisément les informations de commande, réagir aux informations de commande et traiter les informations de commande rapidement, et ils sauvegardent la ressource de signalisation de commande et la puissance consommée du terminal.
PCT/CN2007/070423 2006-08-28 2007-08-06 Station de base et procédé pour transmettre la signalisation de commande de liaison descendante utilisée par la station de base WO2008025274A1 (fr)

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CN2006101126568A CN101137134B (zh) 2006-08-28 2006-08-28 一种基站及其传输下行控制信令的方法
CN200610112656.8 2006-08-28

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US8885652B2 (en) * 2010-08-06 2014-11-11 Futurewei Technologies, Inc. Hybrid orthogonal frequency division multiplexing time domain multiplexing passive optical network
US9479965B2 (en) * 2011-05-03 2016-10-25 Lg Electronics Inc. Method for terminal to transmit/receive signal to/from base station in wireless communication system and device therefor
CN106455095B (zh) * 2015-08-13 2019-09-17 电信科学技术研究院 一种数据传输方法及装置
CN106792776B (zh) * 2015-11-24 2020-04-03 华为技术有限公司 一种波束处理方法和基站
CN114828223A (zh) 2016-09-30 2022-07-29 中兴通讯股份有限公司 寻呼消息的发送、检测方法、装置、设备和存储介质

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CN101137134B (zh) 2010-09-08

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