WO2012142907A1 - Procédé et système d'envoi de données - Google Patents

Procédé et système d'envoi de données Download PDF

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Publication number
WO2012142907A1
WO2012142907A1 PCT/CN2012/073306 CN2012073306W WO2012142907A1 WO 2012142907 A1 WO2012142907 A1 WO 2012142907A1 CN 2012073306 W CN2012073306 W CN 2012073306W WO 2012142907 A1 WO2012142907 A1 WO 2012142907A1
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WO
WIPO (PCT)
Prior art keywords
data
modulated
transport block
modulation
ofdm symbols
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2012/073306
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English (en)
Chinese (zh)
Inventor
许进
郁光辉
梁春丽
郝鹏
戴博
吴欣
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ZTE Corp
Original Assignee
ZTE Corp
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 ZTE Corp filed Critical ZTE Corp
Publication of WO2012142907A1 publication Critical patent/WO2012142907A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • 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
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • H04L5/0046—Determination of the number of bits transmitted on different sub-channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • 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
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling

Definitions

  • the present invention relates to a mobile communication system, and in particular, to a method and system for data transmission.
  • wireless hotspot transmission technology Today, with the rapid development of mobile broadband, wireless hotspot transmission technology has received more and more attention. Unlike ordinary third-generation mobile communication technologies, wireless hotspot transmissions usually have larger transmission bandwidth and higher data throughput. Take the IEEE Institute of Electrical and Electronics Engineers (802.1 lac technology) as an example. The maximum transmission bandwidth can reach 160 megabytes. The peak transmission rate can exceed 3G bps (bits per second). Wireless data communication solutions for hotspots.
  • each user's data is transmitted over the full bandwidth, not according to each The data transmission mode is adjusted correspondingly according to the channel conditions in the frequency bands.
  • the technical problem to be solved by the present invention is to provide a data transmission method and system to solve the defect that the existing system cannot adjust the data transmission mode according to the channel conditions in the respective frequency bands.
  • the present invention uses the following technical solutions:
  • a data transmission method includes:
  • the data obtained by encoding the transport block is modulated and mapped onto an integer number of orthogonal frequency division multiplexing (OFDM) symbols; wherein, within an integer number of the OFDM symbols, the pair is mapped to The modulation used by the data on each sub-band is not exactly the same;
  • OFDM orthogonal frequency division multiplexing
  • a plurality of consecutive OFDM symbols are combined into one radio frame and sent to the receiving end.
  • the steps of encoding each transport block to be transmitted include:
  • a fixed bit rate encoding is performed for each transport block to be transmitted.
  • the data sending method further includes:
  • the corresponding number of bits is added after the data to be modulated. After the bits are filled, subsequent modulation and mapping processing is performed.
  • the data sending method further includes:
  • the step of modulating the data obtained by encoding the transport block includes: selecting, according to channel conditions of each sub-band in the OFDM symbol, a modulation mode to be modulated on the sub-band to be modulated, and then modulating, And the value of the first order is greater than or equal to the value of the second order; wherein, the value of the first order is for a subband that is to be mapped to a better channel condition
  • the maximum value of the order of each modulation mode selected by the data to be modulated, and the value of the second order value is the order of each modulation mode selected for data to be modulated on a sub-band to be mapped to a poor channel condition Maximum value.
  • the modulation method includes: a quadrature phase shift keying modulation method, a quadrature amplitude modulation method including 16 symbols, a quadrature amplitude modulation method including 64 symbols, or a quadrature amplitude modulation method including 256 symbols.
  • the size of each transport block to be transmitted is determined by the packet size of the medium access control layer.
  • a data transmission system includes a first device, a second device, and a third device, where: the first device is configured to: encode each transport block to be transmitted;
  • the second device is configured to: after each of the transport blocks, the data obtained by encoding the transport block is modulated, and then mapped to an integer number of orthogonal frequency division multiplexing (OFDM) symbols; wherein, in an integer number of places Within the OFDM symbol, the modulation scheme used for mapping the data on each sub-band is not exactly the same;
  • OFDM orthogonal frequency division multiplexing
  • the third device is configured to: combine a plurality of consecutive OFDM symbols into one radio frame, and send the signal to the receiving end.
  • the first device is configured to encode each transport block to be transmitted in the following manner: Each transport block to be transmitted is coded at a fixed code rate.
  • the second device is further configured to:
  • the corresponding number of bits is added after the data to be modulated. After the bits are filled, subsequent modulation and mapping processing is performed.
  • the second device is further configured to:
  • the second device is configured to modulate the data obtained by encoding the transport block in the following manner:
  • the corresponding modulation mode is selected after the data to be modulated mapped to the sub-band is modulated, and the value of the first order is greater than or equal to the value of the second order;
  • the value of the first order is the maximum value of the order of each modulation mode selected for the data to be modulated on the sub-band to be mapped to the better channel condition, and the value of the second order is for mapping to the channel condition The maximum value of the order of each modulation mode selected for the data to be modulated on the poor sub-band.
  • the transmitting end can flexibly adjust the modulation mode of the data on each sub-band according to different channel conditions in each sub-band, can effectively ensure the quality of data transmission, and obtain the gain of adaptive coding modulation. This allows for higher throughput and peak rates.
  • FIG. 1 is a flowchart of a data transmission method in an embodiment of the present invention
  • FIG. 2 is a schematic view of an application example 1 of the present invention.
  • FIG. 3 is a schematic diagram of an application example 2 of the present invention. Preferred embodiment of the invention
  • a data sending method includes: a. encoding, each transmitting block to be transmitted by a transmitting end; Wherein, when encoding, a fixed bit rate encoding method may be used; the encoding method may use Turbo code, Convolution code, Low Density Parity Check code, Referred to as LDPC) or other coding methods;
  • LDPC Low Density Parity Check code
  • the transmitting end modulates the data obtained by encoding the transport block, and then maps it to an integer number of Orthogonal Frequency Division Multiplexing (OFDM) symbols;
  • OFDM Orthogonal Frequency Division Multiplexing
  • the modulation scheme used for mapping the data on each sub-band is not exactly the same, that is, at least the modulation scheme selected for mapping to data on one of the sub-bands is mapped to other sub-bands.
  • the modulation method used for the data is different;
  • a plurality of consecutive OFDM symbols are combined into one radio frame and sent to the receiving user.
  • step a the size of the transport block to be transmitted is determined by the packet size of the Medium Access Control (MAC).
  • MAC Medium Access Control
  • the modulation mode of the data used in each sub-band may include: Quadrature Phase Shift Keying (QPSK), orthogonality including 16 symbols Amplitude modulation (16QAM, 16 Quadrature Amplitude Modulation), digital amplitude modulation with 64-symbol quadrature amplitude modulation (64QAM) or 256-symbol quadrature amplitude modulation (256QAM).
  • QPSK Quadrature Phase Shift Keying
  • orthogonality including 16 symbols Amplitude modulation (16QAM, 16 Quadrature Amplitude Modulation
  • 64QAM 64-symbol quadrature amplitude modulation
  • 256QAM 256-symbol quadrature amplitude modulation
  • the transmitting end may select a corresponding modulation for the data to be modulated to be mapped to the sub-band according to channel conditions of each sub-band in the OFDM symbol.
  • the mode that is, a higher order modulation mode may be selected for the data to be modulated on the subband to be mapped to the better channel condition, and the data to be modulated on the subband to be mapped to the channel quality is selected to be lower.
  • the modulation mode of the order that is: the value of the first order is greater than or equal to the value of the second order; wherein, the value of the first order is for the sub-band to be mapped to the channel condition to be modulated
  • the maximum value of the order of each modulation mode of the data selection, and the value of the second order value is the maximum value of the order of each modulation mode selected for the data to be modulated to be mapped to the subband on which the channel condition is poor.
  • the maximum value of the order of each optional modulation mode is m, then the sub-band to be mapped to the channel condition is poor.
  • the modulated data optionally the maximum of the order of each modulation mode is n; where m > n.
  • the channel conditions of each sub-band are measured by the receiving end according to the pilot signal sent by the transmitting end.
  • step b for each transport block, if the transmitting end determines that the data to be modulated is insufficient to occupy an integer number of OFDM symbols after being modulated and mapped, the padding bits of the corresponding number of bits are added after the data to be modulated. Then perform subsequent modulation and mapping processing.
  • the transport block is modulated and mapped onto the integer number of OFDM symbols, if it is determined that the integer OFDM symbols are not occupied, A corresponding number of padding symbols are padded in the integer number of OFDM symbols, thereby occupying the integer number of OFDM symbols.
  • a data transmission system includes a first device and a second device, where:
  • the first device is configured to: encode each transport block to be transmitted;
  • the second device is configured to: after each of the transport blocks, the data obtained by encoding the transport block is modulated, and then mapped to an integer number of orthogonal frequency division multiplexing (OFDM) symbols; wherein, the integer Within the OFDM symbols, the modulation scheme used for mapping the data on each sub-band is not exactly the same;
  • OFDM orthogonal frequency division multiplexing
  • the third device is configured to: combine a plurality of consecutive OFDM symbols into one radio frame, and send the signal to the receiving end.
  • the first means is arranged to encode each transport block to be transmitted in the following manner: Each transport block to be transmitted is coded at a fixed code rate.
  • the second device is further configured to: before each of the transport blocks, if it is determined that the data to be modulated is insufficient to occupy an integer number of OFDM symbols after being modulated and mapped, After the modulated data is added, the padding bits of the corresponding number of bits are added, and then the subsequent modulation and mapping processing is performed.
  • the second device is further configured to: after mapping to the integer number of OFDM symbols, if it is determined that the integer number of OFDM symbols are not full, filling the integer number of OFDM symbols with a corresponding number of padding A symbol that fills the integer number of OFDM symbols.
  • the second means is arranged to modulate the data obtained by encoding the transport block in the following manner:
  • the corresponding modulation mode is selected after the data to be modulated mapped to the sub-band is modulated, and the value of the first order is greater than or equal to the value of the second order;
  • the value of the first order is the maximum value of the order of each modulation mode selected for the data to be modulated on the sub-band to be mapped to the better channel condition, and the value of the second order is for mapping to the channel condition The maximum value of the order of each modulation mode selected for the data to be modulated on the poor sub-band.
  • the encoded data is modulated and mapped onto two OFDM symbols. As shown in Figure 2, where
  • [0, fl ) subcarriers form a sub-band, the data on which is modulated by 256QAM; the sub-carriers in [fl, f2) form a sub-band, and the data on it is modulated by 64QAM; The data on the ⁇ , ⁇ ) subcarriers is modulated by 16QAM, and the data on the [fi, f4] subcarriers is modulated by QPSK, where 0, fl, f2, ⁇ , and f4 are all subcarrier indices. .
  • the transmitting end After the modulation and mapping process is completed, the transmitting end combines a plurality of consecutive OFDM symbols into one wireless frame and sends the same to the receiving user.
  • the encoded data is modulated and mapped onto Si OFDM symbols.
  • the modulation method of 64QAM is used; the data mapped to the [ ⁇ , ⁇ ) subcarrier is modulated by 16QAM, and the data mapped to the [fi, f4] subcarrier is modulated by QPSK, where 0. Fl, £2, ⁇ , and f4 are all subcarrier indices.
  • the insufficient portion is padded with padding bits and modulated and mapped together with the encoded data of the transport block 1, so that the data and padding data of the transport block 1 occupy 2 OFDM symbols.
  • the padding symbol is added at the idle position, so that the padding symbol and the data of the transport block 1 are full. 2 OFDM symbols.
  • transport block 2 where [0,] subcarriers form a subband, the data mapped thereto is modulated by 64QAM; the [G, f4) subcarriers form a subband, onto which are mapped
  • the data is modulated by QPSK, and the missing part uses padding bits or padding symbols, so that the data of transport block 2 is occupied by 3 OFDM symbols.
  • the transmitting end After the modulation and mapping process is completed, the transmitting end combines a plurality of consecutive OFDM symbols including a plurality of transport blocks into one radio frame, and sends the same to the receiving user.
  • the transmitting end can be based on different channel conditions in each sub-band.
  • Flexible adjustment of the modulation mode of data on each sub-band can effectively guarantee the quality of data transmission and obtain the gain of adaptive code modulation, so that higher throughput and peak rate can be further obtained. Therefore, the present invention has strong industrial applicability.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un système d'envoi de données, ledit procédé comprenant les étapes suivantes: coder chaque bloc de transmission en attente de transmission; moduler les données obtenues lors du codage de blocs de transmission, et mapper ensuite celles-ci sur un nombre entier de symboles de multiplexage par répartition orthogonale de la fréquence (OFDM), les modes de modulation modes utilisés dans le nombre entier de symboles OFDM pour les données mappées sur chaque sous-bande n'étant pas complètement identiques; et composer et envoyer à une extrémité de réception une trame sans fil constituée de multiples symboles OFDM continus. Cette solution technique permet à l'extrémité de réception de régler de manière flexible le mode de modulation des données sur chaque sous-bande selon différentes conditions de voie de chaque sous-bande, ce qui permet de garantir efficacement la qualité de transmission des données et d'accroître le codage adaptatif et la modulation, et d'obtenir ainsi un débit supérieur et une vitesse maximale.
PCT/CN2012/073306 2011-04-21 2012-03-30 Procédé et système d'envoi de données Ceased WO2012142907A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201110100938.7A CN102752073B (zh) 2011-04-21 2011-04-21 一种数据发送的方法及系统
CN201110100938.7 2011-04-21

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WO2012142907A1 true WO2012142907A1 (fr) 2012-10-26

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Cited By (1)

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CN112468260A (zh) * 2019-09-09 2021-03-09 北京东土科技股份有限公司 物理帧生成方法、装置、电子设备及介质

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CN103001912B (zh) * 2012-11-12 2015-10-14 深圳思凯微电子有限公司 调频广播频段数模混合信号的自适应带内调制方法
CN104753633B (zh) * 2013-12-31 2019-06-14 中兴通讯股份有限公司 高阶编码处理方法、装置和系统
US11419004B2 (en) 2016-11-08 2022-08-16 Telefonaktiebolaget Lm Ericsson (Publ) Optimization of logical channel processing for multiple transport blocks
EP3619859B1 (fr) * 2017-05-05 2025-06-25 ZTE Corporation Transmission basée sur des blocs de données
CN111901273B (zh) * 2020-01-17 2024-10-25 中兴通讯股份有限公司 一种调制编码方法、装置、设备和存储介质

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CN112468260B (zh) * 2019-09-09 2022-11-18 北京东土科技股份有限公司 物理帧生成方法、装置、电子设备及介质

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CN102752073A (zh) 2012-10-24

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