WO2015085514A1 - Procédé et dispositif de transmission d'informations - Google Patents

Procédé et dispositif de transmission d'informations Download PDF

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Publication number
WO2015085514A1
WO2015085514A1 PCT/CN2013/089090 CN2013089090W WO2015085514A1 WO 2015085514 A1 WO2015085514 A1 WO 2015085514A1 CN 2013089090 W CN2013089090 W CN 2013089090W WO 2015085514 A1 WO2015085514 A1 WO 2015085514A1
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WO
WIPO (PCT)
Prior art keywords
time
spread
frequency transmission
symbols
data modulation
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PCT/CN2013/089090
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English (en)
Chinese (zh)
Inventor
刘德平
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2013/089090 priority Critical patent/WO2015085514A1/fr
Priority to CN201380003745.7A priority patent/CN104995886B/zh
Publication of WO2015085514A1 publication Critical patent/WO2015085514A1/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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload

Definitions

  • the present invention relates to the field of communications, and more particularly to an information transmission method and apparatus. Background technique
  • Orthogonal Frequency Division Multiplexing (OFDM) technology divides a channel into orthogonal sub-channels, converts high-speed data signals into parallel low-speed sub-data streams, and modulates them for transmission on each sub-channel.
  • the signal bandwidth on each subchannel is smaller than the associated bandwidth of the channel, so that each subchannel can be seen as flatness fading, thereby eliminating intersymbol interference.
  • the OFDM symbol length, T_symbol refers to the duration of each OFDM symbol from the perspective of the time domain.
  • a Cyclic Prefix (CP) is inserted between the symbols, that is, the transmitted data after the Inverse Fast Fourier Transform (IFFT) passes through the parallel string. Transform, copy the symbol at the end of the last CP to the beginning of the OFDM symbol to eliminate intersymbol interference. At this time, the actual length of each OFDM symbol becomes T_symbol+T_cp, where T_cp is the CP length.
  • CP Cyclic Prefix
  • IFFT Inverse Fast Fourier Transform
  • 3rd Generation Partnership Project Long Term Evolution (LTE) and Enhanced LTE (LTE-Andanced, LTE-A) uplinks using single carrier frequency division multiple access (Single-carrier Frequency-Division Multiple Access (SC-FDMA), a variant of OFDM, one subframe (subframe), including two slots (slots), a total of 14 OFDM symbols.
  • SC-FDMA single carrier frequency division multiple access
  • the fourth OFDM symbol of the first slot and the second slot at the time of data transmission is a pilot symbol
  • the rest are data symbols.
  • the pilot symbol occupies the same frequency band as the data symbol (or control symbol) in the frequency domain, and selects a cyclic shift of a Zad off chu sequence according to the actual frequency bandwidth in the frequency domain; the data symbol of the control signaling in the time domain Multiply by the pilot symbol When i or the spreading code.
  • Data modulation is performed before the original data is transmitted.
  • Digital modulation can be divided into digital amplitude modulation, digital phase modulation, and digital frequency modulation.
  • the transmitted data is composed of symbols.
  • the number of bits mapped by the modulation symbols is different depending on the modulation technique used. For example, Quadrature Phase Shift Keying (QPSK) modulation symbols are two bits.
  • QAM Quadrature Amplitude Modulation
  • the pilot or reference signal is a known sequence or modulation symbol inserted for channel estimation in system coherent detection.
  • the receiving end can estimate the channel response of the time-frequency resource occupied by the pilot according to the received information on the time-frequency resource of the pilot and the known transmission information carried on the pilot signal, and then pass the time domain and/or the frequency domain difference. The value is obtained, and the channel response on the time-frequency resource occupied by the data symbol is obtained, so that the information transmitted by the transmitting end is obtained according to the received information.
  • M2M The Internet of Things
  • Definition Comparison Single Connect all items to the Internet through information sensing devices for intelligent identification and management. Combined with the Internet, they enable remote sensing and control of all items, resulting in a more intelligent production and living system. It is larger than the current Internet and is widely used in smart power grids, intelligent transportation, environmental protection, government work, public safety, smart home, intelligent fire protection, industrial monitoring, elderly care, and personal health.
  • the standardization organization 3GPP has set up a project team to study the enhancement and optimization of mobile communication networks for the introduction of Machine Type Communication (MTC) devices.
  • Vodafone suggested that many M2M devices, such as electricity meters, may be placed in poorly covered areas such as basements. For these devices, coverage is required to be increased to a maximum of 20 dB to meet the requirements.
  • the user equipment Even if the user equipment always uses the maximum transmit power transmission sequence, the power received by the target base station still does not reach the target received power, even far below the target received power.
  • a relatively straightforward method is that the user equipment transmits in multiple Time Transmission Interval (TTI) (in the 3GPP system, the subframe subframe), and the base station side collects and merges to improve.
  • TTI Time Transmission Interval
  • the base station side collects and merges to improve.
  • the number of repetitions that is, the time transmission unit occupied, has a corresponding relationship with the corresponding coverage enhancement amount (dB) information, and the correspondence relationship can be pre-defined by mathematical calculation or simulation means. Due to the large difference in coverage of actual user equipment, not all user equipments that need to be covered with enhanced coverage require as much compensation as 20 dB. The actual situation is an interval that does not require coverage enhancement to 20 dB coverage enhancement. However, the number of time transmission units required for different coverage enhanced user equipments is different, and the time transmission units required to cover less enhanced user equipment are also less, because the required coverage enhancement compensation can be obtained in a shorter accumulation time.
  • the range from the coverage enhancement of OdB to the coverage enhancement of 20 dB can be divided into several groups. For example [5dB, 10dB, 15dB, 20dB].
  • the system can only provide a repeating value for coverage enhancement, such as 15dB or 20dB.
  • the spectrum efficiency of the system is degraded.
  • block spreading in the time domain is a commonly used method.
  • data packets repeatedly transmitted by different user equipments may occupy the same time and frequency resources, and are distinguished by different orthogonal or quasi-orthogonal spreading codes.
  • the length of the spreading code is equal to the number of repetitions, and the same data packet is used each time. Repeatingly multiplying one element of the corresponding spreading code, so that data of different user equipments can be multiplexed on the same resource, thereby improving spectrum efficiency.
  • the base station After receiving the data in the frequency domain and multiplexing the multiple user equipments, the base station extracts data of different user equipments according to different spreading codes.
  • the orthogonality between the spreading codes of multiple user equipments is Destroyed, affecting the decoding of data packets of different user equipments by the base station.
  • the required number of repetitions is also longer in time extension, and it is easier to exceed the channel correlation time, affecting the orthogonality of the spreading sequence, thereby affecting the correct reception and decoding of the base station, thereby causing performance loss.
  • the embodiments of the present invention provide an information transmission method, a user equipment, and a base station, so as to avoid degradation of the despreading performance of the receiving side and more flexible coordination of signal transmission time of the user equipment.
  • an information transmission method including:
  • the i-th time-frequency transmission unit set includes N time-frequency transmission units.
  • the data modulation symbols are time-domain-spread, and the pilot modulation symbols are used in the n data modulation symbols of the data packet to be transmitted.
  • the method further includes:
  • the indication information is used to indicate information of a spreading code used by the spread spectrum data modulation symbol and information of a spreading code used when spreading the pilot modulation symbol, and mapping the spread spectrum data modulation symbol And information of the time-frequency transmission unit of the spread spectrum pilot modulation symbol.
  • the N is equal to 1;
  • Mapping the ith data modulation symbol and the spread pilot modulation symbol to the i-th time-frequency transmission unit set and transmitting the signal to the base station including:
  • the time-frequency transmission unit including the symbol included in the spread ith data modulation symbol and the symbol included in the spread pilot modulation symbol in a staggered manner to the ith time-frequency transmission unit set includes Orthogonal Frequency Division Multiplexing (OFDM) symbols are transmitted to the base station.
  • OFDM Orthogonal Frequency Division Multiplexing
  • each of the n data modulation symbols of the data packet to be transmitted Modulating the symbol for time domain spreading, and performing time domain spreading on the pilot modulation symbol, including: performing M time-domain spreading for each data modulation symbol by M long time domain spreading code, and passing m length a time domain spreading code, performing N times time domain spreading on the pilot modulation symbol, N is greater than or equal to 2, the M long time domain spreading code includes M elements, and the m long time domain spreading code includes m elements And mapping the spread i-th data modulation symbol and the spread pilot modulation symbol to the i-th time-frequency transmission unit set and transmitting the same to the base station:
  • the h is an integer and takes values from 1 to N.
  • the ith data modulation symbol and the hth time domain expansion of the hth time domain spread spectrum The pilot signal of the frequency is mapped to the h-th time-frequency transmission unit in the set of the i-th time-frequency transmission unit and sent to the base station, and includes:
  • the h-th time-frequency transmission unit of the set of frequency transmission units is included in an OFDM symbol and transmitted to the base station.
  • the method further includes:
  • Frequency-domain spreading is performed on each of the data modulation symbols, and frequency-domain spreading is performed on the pilot modulation symbols.
  • an information transmission method including:
  • each time-frequency transmission unit set in the set of n time-frequency transmission units is mapped with a spread spectrum data modulation symbol and a spread spectrum according to the following manner a pilot adjustment symbol: the i th spread of the spread spectrum of n data modulation symbols on the N time-frequency transmission units included in the set of n time-frequency transmission units a data modulation symbol and a pilot modulation symbol mapped with a spread, the n being an integer greater than 1, the i being an integer and taking a value from 1 to n, the N being an integer greater than or equal to 1;
  • Time domain spreading code based on spread spectrum of n data modulation symbols and spread spectrum pilot modulation
  • the time domain spreading code used by the symbol from the received signal, despreading and detecting n soft demodulation symbols corresponding to the spread n data modulation symbols;
  • the method before the receiving the signal on the set of the n time-frequency transmission units corresponding to the user equipment, the method further includes:
  • indication information which is used to indicate information of a spreading code used when spreading the data modulation symbol, and information of a spreading code used when spreading the pilot modulation symbol, and mapping spread spectrum Information of the time-frequency transmission unit of the data modulation symbol and the spread pilot modulation symbol.
  • the set of the i-th time-frequency transmission unit in the set of the n time-frequency transmission units includes Spreading the i-th data modulation symbol in the spread-spread n data modulation symbols and the pilot-mapped pilot modulation symbols on the N time-frequency transmission units, including:
  • the symbols included in the i-th data modulation symbol of the kth time domain spread spectrum and the symbols included in the k-th time-domain spread pilot modulation symbol are mapped in a staggered manner on the ith time-frequency transmission unit set.
  • the k is a positive integer less than or equal to N.
  • the despreading detects the spread spectrum from the received signal n soft demodulation symbols corresponding to n data modulation symbols, including:
  • the despreading detects the spread spectrum from the received signal n soft demodulation symbols corresponding to n data modulation symbols, including:
  • the time domain spreading code used for the n data modulation symbols of the spread spectrum and the frequency domain spreading code used, and the time domain spreading code used for the spread pilot modulation symbols and the frequency domain extension used The frequency code, from the received signal, despreads and detects the n soft demodulation symbols.
  • a third aspect provides a user equipment, including a spreading unit, a mapping unit, and a sending unit, where
  • the spreading unit is configured to: perform time domain spreading on each of the n data modulation symbols of the data packet to be transmitted, and perform time domain spreading on the pilot modulation symbol, where n is greater than 1. Positive integer
  • the mapping unit and the transmitting unit are respectively configured to: map and transmit each data modulation symbol and the spread pilot modulation symbol that are spread among the spread n data modulation symbols in the following manner: And mapping the spread ith data modulation symbol and the spread pilot modulation symbol to the i-th time-frequency transmission unit set, and the transmitting unit is configured to map the mapping unit to the ith time-frequency transmission unit
  • the spread i-th data modulation symbol and the spread pilot modulation symbol are sent to the base station, where i is a positive integer and takes a value from 1 to n, and the i-th time-frequency transmission unit set includes N time-frequency transmission units.
  • the user equipment further includes a receiving unit, where
  • the receiving unit is configured to: perform frequency domain spreading on each of the n data modulation symbols in the spreading unit, and receive an indication sent by the base station before performing time domain spreading on the pilot modulation symbols Information, the indication information is used to indicate the information of the spreading code used in the spread spectrum data modulation symbol and the information of the spreading code used in the spread pilot modulation symbol, and the mapping of the spread spectrum data modulation symbol and the spread spectrum pilot The information of the time-frequency transmission unit of the modulation symbol.
  • the N is equal to 1;
  • the mapping unit is specifically configured to: map the symbol included in the spread ith data modulation symbol and the symbol included in the spread pilot modulation symbol to the ith time-frequency transmission unit in a staggered manner
  • the aggregated time-frequency transmission unit includes Orthogonal Frequency Division Multiplexing (OFDM) symbols.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the spreading unit is specifically configured to: perform N times time domain spreading on each data modulation symbol by using a M long time domain spreading code, and pass a m long time domain spreading code,
  • the pilot modulation symbol performs N times time domain spreading, N is greater than or equal to 2, and the M long time domain spreading code includes M elements, and the m long time domain spreading code includes m elements;
  • the mapping unit is specifically configured to: map the spread i-th data modulation symbol and the spread pilot modulation symbol to the i-th time-frequency transmission unit set by: The i-th data modulation symbol of the frequency and the pilot modulation symbol of the h-th time-domain spreading are mapped to the h-th time-frequency transmission unit in the set of the i-th time-frequency transmission unit, where h is an integer and takes a value From 1 to N.
  • mapping unit is specifically configured to:
  • the h th time-frequency transmission unit of the set of frequency transmission units is included on an OFDM symbol.
  • the spread spectrum unit is further configured to:
  • each mapping modulation unit and the transmitting unit respectively map and transmit each of the data modulation symbols and the spread pilot modulation symbols spread by the spread of the n data modulation symbols, perform data modulation symbols for each data modulation symbol.
  • Frequency domain spreading, and frequency domain spreading of the pilot modulation symbols are used.
  • a fourth aspect provides a base station, including a receiving unit, a despreading unit, and a decoding and verifying unit;
  • the receiving unit is configured to receive a signal on a set of n time-frequency transmission units corresponding to the user equipment, where each time-frequency transmission unit set in the set of the n time-frequency transmission units is mapped with the spread spectrum data in the following manner Modulation symbols and spread pilot adjustment symbols: among the n time-frequency transmission units included in the set of n time-frequency transmission units, the N time-frequency transmission units are mapped with n spread data modulation symbols Spreading the i-th data modulation symbol and mapping the spread pilot modulation symbol, the n being an integer greater than 1, the i being an integer and taking a value from 1 to n, the N being an integer greater than or equal to 1;
  • the despreading unit is configured to: use a time domain spreading code used by the spread spectrum of n data modulation symbols and a time domain spreading code used by the spread pilot modulation symbol, and receive the signal from the receiving unit despreading and detecting n soft demodulation symbols corresponding to the n data modulation symbols of the spread spectrum;
  • the decoding check unit is configured to: decode and verify the n soft demodulation symbols.
  • the base station further includes a sending unit, where
  • the sending unit is configured to: before the receiving unit receives the signal on the set of the n time-frequency transmission units, send the indication information to the user equipment, where the indication information is used to indicate the spread spectrum used when the spectrum data is modulated by the symbol.
  • the receiving unit receives the signal in the set of the n time-frequency transmission units
  • the i-th data transmission symbol of the n time-frequency transmission units included in the i-th time-frequency transmission unit set is spread with the spread i-th data modulation symbol and the spread spectrum pilot modulation symbol, including :
  • the symbols included in the i-th data modulation symbol of the kth time domain spread spectrum and the symbols included in the k-th time-domain spread pilot modulation symbol are mapped in a staggered manner on the ith time-frequency transmission unit set.
  • the k is a positive integer less than or equal to N.
  • the despreading unit is specifically configured to:
  • the time domain spreading code used for the n data modulation symbols of the spread spectrum and the frequency domain spreading code used, and the time domain spreading code used for the spread pilot modulation symbols and the frequency domain extension used The frequency code, from the received signal, despreads and detects the n soft demodulation symbols.
  • a fifth aspect provides a user equipment, including a processor and a transmitter, where the processor is configured to: perform time domain spreading on each of the n data modulation symbols of the data packet to be transmitted, And performing time domain spreading on the pilot modulation symbols, where n is a positive integer greater than one;
  • the transmitter is configured to: map and transmit each data modulation symbol and the spread pilot modulation symbol that are spread in the spread data n data modulation symbols according to the following manner: the ith data modulation symbol and the spread of the spread spectrum Frequency-frequency pilot modulation symbols are mapped to the i-th time-frequency transmission unit set and sent to the base station, where i is a positive integer and takes values from 1 to n, and the i-th time-frequency transmission unit set includes N times Frequency transmission unit.
  • the user equipment further includes a receiver, where
  • the receiver is configured to: perform, in the processor, perform time domain spreading on each of the n data modulation symbols, and receive indication information sent by the base station before performing time domain spreading on the pilot modulation symbols,
  • the indication information is used to indicate the information of the spreading code used in the spread spectrum data modulation symbol and the information of the spreading code used in the spread pilot modulation symbol, and to map the spread spectrum data modulation symbol and the spread pilot modulation symbol.
  • Information of the time-frequency transmission unit is configured to: perform, in the processor, perform time domain spreading on each of the n data modulation symbols, and receive indication information sent by the base station before performing time domain spreading on the pilot modulation symbols.
  • the N is equal to 1;
  • the transmitter is specifically configured to: map the symbol included in the spread ith data modulation symbol and the symbol included in the spread pilot modulation symbol to the ith time-frequency transmission unit in a staggered manner
  • the aggregated time-frequency transmission unit includes Orthogonal Frequency Division Multiplexing (OFDM) symbols and transmits to the base station.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the processor is specifically configured to: pass the M long time domain spreading code, The data modulation symbols are subjected to N times time domain spreading, and the M time domain spreading is performed by the m long time domain spreading code, where N is greater than or equal to 2, and the M long time domain spreading code includes M Element, the m long time domain spreading code includes m elements;
  • the transmitter is specifically configured to: map the spread i-th data modulation symbol and the spread pilot modulation symbol to the i-th time-frequency transmission unit set and send the same to the base station by: The i-th data modulation symbol of the h-th time-domain spread spectrum and the pilot modulation symbol of the h-th time-domain spread spectrum are mapped to the h-th time-frequency transmission unit in the ith time-frequency transmission unit set and sent to The base station, the h is an integer and takes values from 1 to N.
  • the transmitter is specifically configured to:
  • the h-th time-frequency transmission unit of the set of frequency transmission units is included in an OFDM symbol and transmitted to the base station.
  • the processor is further configured to: Before each of the data modulation symbols spread by the spread of the n data modulation symbols and the spread pilot modulation symbols are mapped and transmitted, performing frequency domain spreading on each of the data modulation symbols, and modulating the pilot The symbol performs frequency domain spreading.
  • a base station including a processor and a receiver, where
  • the receiver is configured to: receive a signal on a set of n time-frequency transmission units corresponding to the user equipment, where each time-frequency transmission unit set in the set of the n time-frequency transmission units is mapped with a spread spectrum data modulation in the following manner Symbol and spread pilot adjustment symbols: the expansion of n data modulation symbols mapped to the N time-frequency transmission units included in the i-th time-frequency transmission unit set in the set of n time-frequency transmission units The i-th data modulation symbol of the frequency and the pilot modulation symbol mapped to the spread, the n being an integer greater than 1, the i being an integer and taking a value from 1 to n, the N being an integer greater than or equal to 1;
  • the processor is configured to: demodulate and detect the time domain spreading code used by the spread spectrum of the n data modulation symbols and the time domain spreading code used by the spread pilot modulation symbols.
  • the n soft demodulation symbols corresponding to the spread n data modulation symbols, and the n soft demodulation symbols are decoded and verified.
  • the base station further includes a transmitter, where the transmitter is configured to: transmit, at the receiver, the n time-frequency transmissions corresponding to the user equipment Before receiving the signal on the set of the transmission unit, transmitting, to the user equipment, indication information, where the indication information is used to indicate the information of the spreading code used when the frequency-modulated data is modulated, and the spreading code used when the pilot-modulated symbol is spread. And information of the time-frequency transmission unit that maps the spread spectrum data modulation symbols and the spread pilot modulation symbols.
  • the receiver receives the signal in the set of the n time-frequency transmission units
  • the i-th time-frequency transmission unit includes a spread spectrum of the i-th data modulation symbol mapped to the n data modulation symbols and the spread spectrum pilot modulation symbol, including :
  • the symbols included in the i-th data modulation symbol of the kth time domain spread spectrum and the symbols included in the k-th time-domain spread pilot modulation symbol are mapped in a staggered manner on the ith time-frequency transmission unit set.
  • the k is a positive integer less than or equal to N.
  • the processor is specifically configured to:
  • the processor is specifically configured to:
  • a modulation symbol (a data modulation symbol or a pilot modulation symbol) as a basic unit for spreading
  • the basic granularity of the spread spectrum becomes small, it is possible to avoid multiple repetitions of the block spread spectrum data packet exceeding the channel correlation.
  • the signals between the receiving side user equipments are not orthogonal and the despreading performance is degraded.
  • the signal transmission time of the user equipment can be more flexibly coordinated, and multiplexing and signal transmission between the user equipments can be arranged.
  • FIG. 1 is a schematic flowchart of an information transmission method according to an embodiment of the present invention.
  • FIG. 2 is a data modulation symbol and pilot modulation symbol map according to another embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of an information transmission method according to another embodiment of the present invention.
  • FIG. 5 is a schematic block diagram of a user equipment according to another embodiment of the present invention.
  • FIG. 6 is a schematic block diagram of a user equipment according to another embodiment of the present invention.
  • FIG. 7 is a schematic block diagram of a base station according to another embodiment of the present invention.
  • FIG. 8 is a schematic block diagram of a base station according to another embodiment of the present invention.
  • FIG. 9 is a schematic block diagram of a user equipment according to another embodiment of the present invention.
  • FIG. 10 is a schematic block diagram of a user equipment according to another embodiment of the present invention.
  • FIG. 11 is a schematic block diagram of a base station according to another embodiment of the present invention.
  • FIG. 12 is a schematic block diagram of a base station according to another embodiment of the present invention. detailed description
  • FIG. 1 is a schematic flowchart of an information transmission method 100 according to an embodiment of the present invention.
  • the method 100 can be performed by a user equipment. As shown in FIG. 1, the method 100 includes:
  • S110 Perform time domain spreading on each of the n data modulation symbols of the data packet to be transmitted, and perform time domain spreading on the pilot modulation symbol, where n is an integer greater than 1.
  • the set of frequency transmission units includes N time-frequency transmission units, and N is an integer greater than or equal to 1.
  • the user equipment can obtain the original information bit sequence (xl, x2%), and then obtain the n data modulation symbols by adding the CRC (crcl, crc2%) and channel coding modulation to the original bit sequence. (Ql, Q2, ...
  • the user equipment may separately perform time domain spreading on each of the n data modulation symbols; the user equipment performs time domain spreading on the pilot modulation symbols; The user equipment may map and transmit each data modulation symbol and the spread pilot modulation symbol spread in the spread data n data modulation symbols in the following manner: the ith data modulation symbol to be spread and the spread spectrum
  • the pilot modulation symbol is mapped to the i-th time-frequency transmission unit set and sent to the base station, where i is a positive integer and takes a value from 1 to n, and the ith time-frequency transmission unit set includes N time-frequency transmission units. , N is an integer greater than or equal to 1.
  • a modulation symbol (a data modulation symbol or a pilot modulation symbol) as a basic unit for spreading
  • the basic granularity of the spread spectrum becomes small, it is possible to avoid multiple repetitions of the block spread spectrum data packet exceeding the channel correlation.
  • the signals between the receiving side user equipments are not orthogonal and the despreading performance is degraded.
  • the signal transmission time of the user equipment can be more flexibly coordinated, and multiplexing and signal transmission between the user equipments can be arranged.
  • the time-domain spreading of the pilot modulation symbols of the user equipment may be: when the data modulation symbols are spread, the pilot adjustment symbols are also spread, and the spread spectrum is used. Any of the data modulation symbols and the spread pilot modulation symbols are mapped onto a corresponding set of time-frequency transmission units and transmitted to the base station.
  • the base station can obtain the soft demodulation symbol corresponding to the spread data modulation symbol according to the sequence corresponding to the any data modulation symbol carried on the time-frequency transmission unit and the sequence corresponding to the spread pilot modulation symbol.
  • the pilot modulation symbols that are spread may be the same.
  • the user equipment may first spread a pilot modulation symbol, and perform spreading on each data modulation symbol in the n data modulation symbols, and spread any data. Modulation symbol And spreading the pilot modulation symbols onto the corresponding set of time-frequency transmission units of the data modulation symbols and transmitting to the base station. In this case, it is not necessary to spread the pilot modulation symbols when spreading the pilot modulation symbols.
  • the user equipment may perform only time domain spreading on each data modulation symbol, and perform only time domain spreading on the pilot modulation symbols.
  • the spreading code used for spreading the data modulation symbol and the pilot modulation symbol is a one-dimensional spreading code in the time domain.
  • the user equipment may perform both time domain spreading and frequency domain spreading on each data modulation symbol, and performing both time domain spreading and frequency domain spreading on the pilot adjusting symbols.
  • the spreading code used for spreading the data modulation symbol and the pilot modulation symbol is time-frequency two-dimensional.
  • the user equipment may use the OFDM symbol or the subframe as a basic spreading unit, and each of the n data modulation symbols of the data packet to be transmitted is separately time-domain spread.
  • the subframe is also composed of OFDM symbols in the time domain, so it can also be reduced to OFDM symbol-level spreading. Therefore, we will mainly explain the OFDM symbol-level spreading as an example.
  • the data modulation symbol may be multiplied by an M-length time domain spreading code; the pilot modulation symbol needs to occupy m OFDM symbols in the time domain ( Alternatively, m ⁇ M ), the pilot modulation symbol can be multiplied by an m-length time domain spreading code.
  • the spread data modulation symbols and the spread pilot data modulation symbols can then be mapped onto corresponding OFDM symbols on the corresponding time-frequency transmission unit for transmission.
  • an time-frequency transmission unit can occupy (M + m) OFDM symbols in the time domain.
  • the different user equipments of the code division multiplexing on the same time-frequency transmission unit may adopt the same length of M and in the embodiment of the present invention, when N is equal to 1, only one data modulation symbol needs to be performed once.
  • Time domain spreading ie, multiplying only the time domain spreading code
  • performing a time domain spreading on the pilot modulation symbols ie, multiplying only the time domain spreading code
  • the i data modulation symbols and the spread pilot modulated symbols are mapped to the i-th time-frequency transmission unit set and sent to the base station, and may include: a symbol included in the spread-th i-th data modulation symbol and a spread spectrum
  • the symbols included in the pilot modulation symbols are mapped in a staggered manner onto the OFDM symbols included in the time-frequency transmission unit of the set of time-frequency transmission units.
  • a time-frequency transmission unit is mapped with a spread spectrum data modulation symbol
  • M data symbols and m pilot symbols mapped with spread pilot modulation symbols may be interleaved ⁇ ij , such as first / / ⁇ ⁇ data symbols, followed by a pilot symbol; or a data symbol and a pilot symbol
  • the M data symbols and the m data symbols included in the above one time-frequency transmission unit may also be arranged in a non-interlaced manner, for example, M data symbols may be preceded, m pilot symbols may be followed.
  • performing time domain spreading on each of the n data modulation symbols of the data packet to be transmitted in S110, and performing time domain spreading on the pilot modulation symbols may include: M long time domain spreading code, performing N time domain spreading for each data modulation symbol, and performing N time domain spreading on the pilot modulation symbol by m long time domain spreading code, N is greater than or equal to 2 .
  • M long spreading code represents that the spreading code has M elements
  • m long spreading code represents that the spreading code has m elements.
  • the spreaded ith data modulation symbol and the spread pilot modulation symbol are mapped to the i-th time-frequency transmission unit set and sent to the base station by: transmitting the i-th time domain spread ith Transmitting the data modulation symbols and the pilot modulation symbols of the hth time domain spread to the h th time frequency transmission unit in the i-th time-frequency transmission unit set, where the h is an integer and the value is 1 to N.
  • the user equipment may perform N times time domain spreading on a certain data modulation symbol and N times time domain spreading on the pilot modulation symbols. That is, the user equipment can map the one data modulation symbol onto the OFDM OFDM symbols, and the spread pilot modulation symbols can be mapped onto N x m OFDM symbols, where N ⁇ 1.
  • N x M , N xm can be decomposed into N M and N m, ⁇ M, ..., M ⁇ ⁇ m,...m ⁇ respectively, that is, a spreading code of M length and m length is used.
  • the data modulation symbols and the pilot modulation symbols are separately spread and mapped N times.
  • the OFDM symbols that need to be occupied by the data modulation symbols and the pilot modulation symbols of the user equipment 1 are 2M and 2m, respectively, and the data modulation symbols of the user equipment 2 and the OFDM symbols that need to be occupied after spreading the pilot modulation symbols are respectively It is M and m.
  • the data modulation symbol since the data modulation symbol of the user equipment 1 needs to occupy 2M OFDM symbols in the time domain, it can be divided into two groups of M OFDM symbols, and two time lengths are required for performing time domain spreading.
  • the m-length spreading code can be used twice.
  • the length of the spreading code used by the user equipment 1 for spreading the data modulation symbols and the pilot modulation symbols, and the manner of each spreading is similar to that of the user equipment 2.
  • the length of the time domain spreading code used by different user equipments may also be a multiple relationship.
  • the above M and m may be the minimum spreading code length, corresponding to a time-frequency transmission unit.
  • the minimum time-frequency transmission units occupied by different user equipments may be equal in size.
  • the length of the spreading code corresponding to one data modulation symbol of the user equipment may be ⁇ ⁇
  • the length of the spreading code corresponding to the pilot modulation symbol may be N xm , that is, the user equipment may expand once.
  • One data modulation symbol of the frequency and the pilot-modulated symbol of the first spreading are mapped to N time-frequency transmission units, where N ⁇ l.
  • the M data symbols and the m data symbols included in any one of the time-frequency transmission units may also be arranged in a non-interlaced manner, for example, M data symbols may be preceded, m pilot symbols may be followed, and so on.
  • the user equipment may perform only time domain spreading on the data modulation symbols and the pilot modulation symbols.
  • one time-frequency transmission unit may occupy only one sub-carrier in the frequency domain.
  • the user equipment can frequency-multiplex multiple data modulation symbols in the frequency domain. For example, one data modulation symbol occupies one subcarrier, and since one resource block (RB) has 12 subcarriers, 12 data modulation symbols can be frequency division multiplexed.
  • a user equipment may also occupy only a part of subcarriers in the frequency domain.
  • 12 data modulation symbols multiplexed on one RB may be from 1 to 12 user equipments, that is, each user equipment occupies one subcarrier to transmit one data modulation symbol respectively; for example, one RB is multiplexed with the first one.
  • 1 data modulation symbol of the user equipment 3 data modulation symbols of the second user equipment, 5 data modulation symbols of the third user equipment, 3 data modulation symbols of the fourth user equipment, and the like.
  • How to implement frequency division multiplexing according to the requirements of system demodulation performance, channel fading of user equipment and system The delay requirements and other factors are determined.
  • the method 100 may further include: Each of the data modulation symbols is frequency domain spread, and the pilot modulation symbols are frequency domain spread.
  • the user equipment may perform frequency domain spreading on the data modulation symbols and the pilot modulation symbols, that is, performing time domain spreading.
  • one time-frequency transmission unit may occupy multiple sub-carriers in the frequency domain. That is to say, data modulation symbols of a plurality of user equipments can be code-multiplexed on a plurality of subcarriers.
  • a user equipment can multiply a data modulation symbol by a shift of the zad off chu sequence to occupy one RB, wherein different user equipments use different sequence shifts to occupy the one RB.
  • the pilot modulation symbols the user equipment can also transmit by one shift of the zad off chu sequence, wherein different user equipments use different sequence shifts.
  • the number of data modulation symbols transmitted in the frequency domain can be freely combined according to the requirements of the system demodulation performance, the channel fading condition of the user, the delay requirement of the system, and the like, and the included in the time domain transmission unit.
  • the spread data modulation symbols and the spread pilot modulation symbols occupy the same bandwidth, that is, occupy the same subcarrier.
  • the method 100 is performed after performing time domain spreading on each of the n data modulation symbols of the data packet to be transmitted, and performing time domain spreading on the pilot modulation symbols. It can also include:
  • the indication information is used to indicate information of a spreading code used when the data is modulated by the spread spectrum data, and information of a spreading code used when the pilot modulation symbol is used, and a data spreading symbol of the mapping spread spectrum And information of the time-frequency transmission unit of the pilot modulation symbol.
  • the information of the spreading code may include a length and a serial number of the spreading code.
  • the spreading code used by the user equipment to spread the data modulation symbols and the pilot modulation symbols and the mapped time-frequency transmission unit may be notified in advance by the base station, where the base station may send the code channel information to the user equipment ( Specifically, it can be represented by a spreading code number. According to the code channel information, the user equipment can acquire the time domain spreading code and the frequency domain spreading code.
  • the information of the spreading code and the information of the time-frequency transmission unit may also be predefined.
  • a modulation symbol (a data modulation symbol or a pilot modulation symbol) as a basic unit for spreading
  • the basic granularity of the spread spectrum becomes small, it is possible to avoid multiple repetitions of the block spread spectrum data packet exceeding the channel correlation.
  • the signal between the receiving side users after the time is not orthogonal and thus despreading Can drop.
  • the signal transmission time of the user equipment can be more flexibly coordinated, and multiplexing and signal transmission between the user equipments can be arranged.
  • the information transmission method according to an embodiment of the present invention has been described above from the user equipment side, and an information transmission method according to an embodiment of the present invention will be described below from the base station side.
  • FIG. 3 is a schematic diagram of an information transmission method 200 according to an embodiment of the present invention.
  • the method 200 can be performed by a base station. As shown in FIG. 3, the method 200 includes:
  • S210 Receive a signal on a set of n time-frequency transmission units corresponding to the user equipment, where each time-frequency transmission unit set in the set of n time-frequency transmission units is mapped with a spread spectrum data modulation symbol and Spreading pilot adjustment symbols: spreading in the n data modulation symbols mapped to the N time-frequency transmission units included in the ith time-frequency transmission unit set included in the set of n time-frequency transmission units The i-th data modulation symbol and the pilot-modulated symbol mapped to the spread, the n being an integer greater than 1, the i being an integer and taking a value from 1 to n, wherein the N is an integer greater than or equal to 1;
  • the base station may receive a signal from a set of time-frequency transmission units, wherein the one time-frequency transmission unit set may be code-multiplexed with a data modulation symbol and a spread pilot of each of the plurality of user equipments.
  • the modulation symbol then, the base station may despread a soft demodulation symbol of each user equipment from the received signal according to the time domain spreading code used by each user equipment. Repeating the above receiving and despreading operations, and after collecting all the n soft demodulation symbols of a data packet of a user equipment, decoding all n soft demodulation symbols of a data packet of the one user equipment and check.
  • signals of a plurality of user equipments spread in units of modulation symbols may be code-multiplexed, and the base station bases each on the set of time-frequency transmission units.
  • the spreading codes used by the user equipment are respectively despread, for example, the joint data symbol and the pilot symbol maximum likelihood detect the soft demodulation symbols of each of the plurality of user equipments. Since the basic granularity of the spread spectrum becomes smaller, from one data packet to one modulation symbol, the multiple repetition times of the block spread spectrum data packet can be avoided to exceed the channel correlation time, and the signals between the receiving side users are not orthogonal and thus the solution The problem of reduced performance. And, due to the small granularity of the spread spectrum, The signal transmission time of the user equipment can be more flexibly coordinated, and the multiplexing and signal transmission between the user equipments can be arranged.
  • the de-spreading detects the n soft demodulation symbols corresponding to the n data modulation symbols of the spread, and the method includes:
  • demodulating the soft demodulation symbol from the received signal may detect the soft demodulation symbol for the joint data symbol and the pilot symbol in a maximum likelihood manner.
  • the receiving side may separately store the locally stored spreading code corresponding to the data modulation symbol of the user equipment and the time-frequency transmission unit respectively.
  • the data packets of multiple uplink user equipments may be different in size or the same. Since the spread spectrum is modulation symbol level, and the smallest code division multiplexing unit is a time-frequency transmission unit, it is only required to ensure the spreading code code used by each user equipment of the code division multiplexing on one time-frequency transmission unit. Orthogonal. Specifically, for a time-frequency transmission unit, a spreading code corresponding to each data modulation symbol of each of the n data modulation symbols of a data packet of a user equipment may be a spreading code code corresponding to a data modulation symbol of another user equipment. The orthogonal coding, and the spreading code used when the one user equipment spreads the pilot modulation symbol is orthogonal to the spreading code code used when the other user equipment spreads the pilot modulation symbol.
  • each of the spread spectrum tracks of each time-frequency transmission unit can transmit at most one data modulation symbol. That is, one data modulation symbol of the user equipment can be transmitted through one or more time-frequency transmission units.
  • the one time-frequency transmission unit may include M+m OFDM symbols in the time domain; the M OFDM symbols are data symbols, and the spreading codes corresponding to the data modulation symbols of different user equipments mapped on the orthogonal are orthogonal; m OFDM The symbols are pilot symbols on which the spreading codes corresponding to the pilot modulation symbols of different user equipments are orthogonal.
  • the data modulation symbol A1 of the UE1, the data modulation symbol B1 of the UE2, and the data modulation symbol C1 of the UE3 are code-multiplexed on the first time-frequency transmission unit, where the data modulation symbols A1, B1, and C1 are expanded.
  • the frequency code is divided into orthogonal codes.
  • the second time-frequency transmission unit is code-multiplexed with the data modulation symbol A2 of the UE1, the data modulation symbol B2 of the UE2, and the data modulation symbol C1 of the UE3, where the data modulation symbols A2, B2, and C1 correspond to the spreading code. Code division is orthogonal.
  • the data modulation symbol A3 of UE1, the data modulation symbol B3 of UE2, and the data modulation symbol D1 of UE4 are code-multiplexed on the third time-frequency transmission unit, where the spreading codes corresponding to the data modulation symbols A3, B3 and D1 are used. Code division is orthogonal.
  • the data modulation symbol A4 of the UE1, the data modulation symbol B4 of the UE2, and the data modulation symbol D2 of the UE4 are code-multiplexed on the fourth time-frequency transmission unit, wherein the data modulation symbols A4, B4, and D2 correspond to the spread spectrum.
  • the code code is divided orthogonally.
  • the data modulation symbol A5 of the UE1, the data modulation symbol B5 of the UE2, and the data modulation symbol D3 of the UE4 are code-multiplexed on the fifth time-frequency transmission unit, where the spreading code code corresponding to the data modulation symbols A5, B5 and D3 Sub-orthogonal.
  • the data modulation symbol A6 of UE1, the data modulation symbol B56 of UE2, and the data modulation symbol D4 of UE4 are code-multiplexed on the sixth time-frequency transmission unit, where the spreading code codes corresponding to the data modulation symbols A6, B6 and D4 Sub-orthogonal. It should be noted that the first time-frequency transmission unit and the second time-frequency transmission unit are mapped with the same number of UE3s.
  • the modulation symbol CI it means that the data modulation symbol C1 has been subjected to at least two time domain spreading and the primary time domain spread data modulation symbols are mapped on a time-frequency transmission unit, wherein each time domain spread spectrum is used.
  • the spreading codes can be the same or different.
  • each time-frequency transmission unit can simultaneously map the pilot modulation of the same number of user equipments.
  • the symbol, the specific mapping method, and the orthogonality of the spreading code are similar, and are not described here.
  • the signal from the received signal in S220 is despread to detect the spread spectrum.
  • the n soft demodulation symbols corresponding to the n data modulation symbols may include: a time domain spreading code used for the n data modulation symbols based on the spreading and the frequency domain spreading code used, and the spread pilot The time domain spreading code used by the modulation symbol and the used frequency domain spreading code are used to despread the n soft demodulation symbols from the received signal.
  • the number of user equipments that can be code-multiplexed by one time-frequency transmission unit may be based on the number M of OFDM symbols of the transmission-spread data modulation symbols included in the time-frequency transmission unit, and the transmission spread spectrum.
  • the number m of OFDM symbols of the pilot modulation symbols is determined. Specifically, the number of user equipments that can be code-multiplexed is min ⁇ M, m ⁇ , or the number of user equipments that can be code-multiplexed is less than min ⁇ M, m ⁇ .
  • a time-frequency transmission unit for one subcarrier including 14 sub-carriers and 14 OFDM symbols (of which 7 OFDM symbols are used for transmitting spread spectrum modulation symbols and 7 OFDM symbols for transmitting spread pilot modulation symbols)
  • the modulation symbols of the seven user equipments can be code-multiplexed, wherein each user equipment can be distinguished by the code channel in the time domain.
  • the code channel configuration of the embodiment of the present invention may be that the time domain uses 7 long spreading codes for spreading, so 7 OFDM symbols are used as data symbols, and 7 are used as pilot symbols, and a total of 7 users can be multiplexed.
  • Equipment; One RB in the frequency domain has 12 subcarriers, including 12 such time-frequency transmission units. Therefore, 1 RB, 14 OFDM symbols can be multiplexed with 84 user equipments (7 x 12).
  • the method 200 before receiving the signal on the ith time-frequency transmission unit set of the user equipment of the S210, the method 200 may further include:
  • the information of the spreading code may include a spreading code length and a sequence number Wait. And transmitting, to the user equipment, indication information, which is used to indicate the information of the spreading code used when the data is modulated by the spread spectrum data and the spreading code information used in the pilot modulation symbol, and the data modulation symbol and the extension of the mapping spread spectrum Time-frequency transmission unit of frequency pilot modulation symbols.
  • the base station can allocate the time-frequency transmission unit and the used spreading code to each user equipment based on channel fading conditions, transmission power, or other interference factors of each user equipment.
  • signals of a plurality of user equipments spread in units of modulation symbols may be code-multiplexed, and the base station bases each on the set of time-frequency transmission units.
  • the spreading codes used by the user equipment are respectively despread, for example, the joint data symbol and the pilot symbol maximum likelihood detect the soft demodulation symbols of each of the plurality of user equipments. Since the basic granularity of the spread spectrum becomes smaller, from one data packet to one modulation symbol, the multiple repetition times of the block spread spectrum data packet can be avoided to exceed the channel correlation time, and the signals between the receiving side users are not orthogonal and thus the solution The problem of reduced performance. Moreover, since the granularity of the spread spectrum is small, the signal transmission time of the user equipment can be more flexibly coordinated, and multiplexing and signal transmission between the user equipments can be arranged.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • FIG. 5 is a schematic block diagram of a user equipment 300 in accordance with an embodiment of the present invention.
  • the user equipment 300 includes: a spreading unit 310, a mapping unit 320, and a transmitting unit 330.
  • the spreading unit 310 is configured to: each of n data modulation symbols of a data packet to be transmitted.
  • the data modulation symbols respectively perform time domain spreading, and perform time domain spreading on the pilot modulation symbols, where n is a positive integer greater than one;
  • the mapping unit 320 and the transmitting unit 330 are respectively configured to: map and transmit each of the spectrally modulated symbols and the spread pilot modulation symbols that are spread among the spread n data modulation symbols in the following manner:
  • the mapping unit 320 is configured to map the spread ith data modulation symbol and the spread pilot modulation symbol onto the i-th time-frequency transmission unit set
  • the sending unit 330 is configured to map the mapping unit 320 to
  • the spread i-th data modulation symbol and the spread pilot modulation symbol on the i-th time-frequency transmission unit set are sent to a base station, where i is a positive integer and takes values from 1 to n.
  • the set of i time-frequency transmission units includes N time-frequency transmission units.
  • the user equipment 300 further includes a receiving unit 340.
  • the receiving unit 340 is configured to: perform, in the spreading unit 310, each data modulation symbol of the n data modulation symbols.
  • the time domain spread spectrum and before performing time domain spreading on the pilot modulation symbols, receiving indication information sent by the base station, where the indication information is used to indicate information of the spreading code used by the spread spectrum data modulation symbol and the spread pilot modulation
  • the information of the spreading code used in the symbol and the information of the time-frequency transmission unit that maps the spread data modulation symbol and the spread pilot modulation symbol.
  • the N is equal to 1;
  • the mapping unit 320 is specifically configured to: map the symbols included in the spread i-th data modulation symbol and the symbols included in the spread pilot modulation symbols to the i-th time-frequency transmission in a staggered manner
  • the time-frequency transmission unit of the unit set includes Orthogonal Frequency Division Multiplexing (OFDM) symbols.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the spreading unit 310 is specifically configured to: perform N times time domain spreading on each data modulation symbol by using an M long time domain spreading code, and pass the m long time domain spreading code,
  • the frequency modulation symbol performs N times time domain spreading, N is greater than or equal to 2, and the M long time domain spreading code includes M elements, and the m long time domain spreading code includes m elements;
  • the mapping unit 320 is specifically configured to: map the spread i-th data modulation symbol and the spread pilot modulation symbol to the i-th time-frequency transmission unit set by: Spreading the i-th data modulation symbol and the h-th time-domain-spread pilot modulation symbol are mapped to the h-th time-frequency transmission unit in the i-th time-frequency transmission unit set, where h is an integer and is taken Values range from 1 to N.
  • mapping unit 320 is specifically configured to:
  • the h th time-frequency transmission unit of the set of frequency transmission units is included on an OFDM symbol.
  • the spreading unit 310 is further configured to:
  • Modulating each data before the mapping unit 320 and the transmitting unit 330 respectively map and transmit each of the data modulation symbols and the spread pilot modulation symbols spread by the spread of the n data modulation symbols.
  • the symbol performs frequency domain spreading and frequency domain spreading of the pilot modulation symbols.
  • the user equipment 300 according to the embodiment of the present invention may correspond to the user equipment in the information transmission method according to the embodiment of the present invention, and may correspond to the corresponding flow of the information transmission method 100 according to the embodiment of the present invention. This will not be repeated here.
  • embodiments of the present invention pass modulation symbols (data modulation symbols or pilot modulation symbols) Spreading for the basic unit, since the basic granularity of the spread spectrum becomes smaller, it can be avoided that the multiple repetition of the block spread spectrum data packet exceeds the channel correlation time and the signal between the receiving side users is not orthogonal and the despreading performance is degraded. Moreover, since the granularity of the spread spectrum is small, the signal transmission time of the user equipment can be more flexibly coordinated, and multiplexing and signal transmission between the user equipments can be arranged.
  • FIG. 7 is a schematic block diagram of a base station 400 in accordance with an embodiment of the present invention.
  • the base station 400 includes a receiving unit 410, a despreading unit 420, and a decoding check unit 430;
  • the receiving unit 410 is configured to: receive a signal on a set of n time-frequency transmission units corresponding to the user equipment, where each time-frequency transmission unit set in the set of the n time-frequency transmission units is mapped to have a spread spectrum in the following manner a data modulation symbol and a spread spectrum pilot adjustment symbol: the n time-frequency transmission unit sets included in the set of n time-frequency transmission units are mapped to n data modulation symbols on the N time-frequency transmission units a spread spectrum of the i-th data modulation symbol and a pilot-spread pilot modulation symbol, the n being an integer greater than 1, the i being an integer and taking a value from 1 to n, the N being an integer greater than or equal to 1;
  • the despreading unit 420 is configured to: perform time domain spreading on the n data modulation symbols that are used for spreading, and despread and detect n soft demodulation symbols corresponding to the n data modulation symbols that are spread;
  • the decoding check unit 430 is configured to: decode and verify the n soft demodulation symbols.
  • the base station 400 further includes a sending unit 440 unit, where the sending unit 440 is configured to: before the receiving unit 410 receives the signal on the set of the n time-frequency transmitting units, Transmitting, by the user equipment, the unit 440, the information indicating the information of the spreading code used when the data is modulated by the spread spectrum data and the information of the spreading code used for the spread pilot modulation symbol, and mapping extension Frequency data modulation symbols and information of time-frequency transmission units of spread pilot modulation symbols.
  • the n time-frequency transmission units included in the set of the i-th time-frequency transmission units in the set of the n time-frequency transmission units in the set of the n time-frequency transmission units received by the receiving unit 410 are mapped with n data modulations that are spread spectrum.
  • the ith data modulation symbol of the spread spectrum in the symbol and the pilot modulation symbol mapped with the spread spectrum include:
  • the symbols included in the i-th data modulation symbol of the kth time domain spread spectrum and the symbols included in the k-th time-domain spread pilot modulation symbol are mapped in a staggered manner on the ith time-frequency transmission unit set.
  • the k is a positive integer less than or equal to N.
  • the despreading unit 420 is specifically configured to: Acquiring each of the first values of the N first values corresponding to each of the data modulation symbols spread by the spread of the n data modulation symbols in the following manner, and acquiring the mapping on the set of each time-frequency transmission unit
  • Each of the N second values corresponding to the spread pilot modulation symbols : an M long time domain spreading code used for the spread ith data modulation symbol, and the ith time frequency Multiplying the sequence point corresponding to the i-th data modulation symbol of the h-th time-domain spread spectrum mapped on the h-th time-frequency transmission unit in the transmission unit set to obtain the first value, and the ith time-frequency transmission unit a m long time domain spreading code used by the spread spectrum pilot modulation symbol mapped on the set, and a sequence point corresponding to the h th time time domain spread pilot modulation symbol mapped on the hth time frequency transmission unit Multiply by to obtain a second value, where N is an integer greater than or equal to 2, h is
  • the despreading unit 420 is specifically configured to:
  • the time domain spreading code used for the n data modulation symbols of the spread spectrum and the frequency domain spreading code used, and the time domain spreading code used for the spread pilot modulation symbols and the frequency domain extension used The frequency code, from the received signal, despreads and detects the n soft demodulation symbols.
  • the base station 400 according to the embodiment of the present invention may correspond to the base station in the information transmission method according to the embodiment of the present invention, and may correspond to the corresponding flow of the information transmission method 200 according to the embodiment of the present invention. Let me repeat.
  • a signal that is spread by a plurality of user equipments in units of modulation symbols may be code-multiplexed, and the base station is based on the set of the one-time transmission unit.
  • the spreading codes used by the user equipments are respectively despread, for example, the joint data symbols and the pilot symbols are greatly likelihooded to detect soft demodulation symbols of each of the plurality of user equipments. Since the basic granularity of the spread spectrum becomes smaller, the data is reduced from one data packet to one modulation symbol, so that the multiple repetition times of the block spread spectrum data packet can be avoided longer than the channel correlation time, and the signals between the receiving side users are not orthogonal and thus the solution The problem of reduced performance. Moreover, since the granularity of the spread spectrum is small, the signal transmission time of the user equipment can be more flexibly coordinated, and the multiplexing and signal transmission unit between the user equipments can be arranged.
  • FIG. 9 is a schematic block diagram of a user equipment 500 in accordance with an embodiment of the present invention.
  • the user equipment 500 includes: a processor 510 and a transmitter 520;
  • the processor 510 is configured to: perform time domain spreading on each of the n data modulation symbols of the data packet to be transmitted, and perform time domain spreading on the pilot modulation symbol, where n is greater than 1.
  • the transmitter 520 is configured to: map and transmit each of the data modulation symbols and the spread pilot modulation symbols that are spread by the spread of the n data modulation symbols in the following manner: the ith data modulation symbol to be spread And the spread spectrum pilot modulation symbols are mapped to the i-th time-frequency transmission unit set and sent to the base station, where i is a positive integer and takes values from 1 to n, and the ith time-frequency transmission unit set includes N Time-frequency transmission unit.
  • the user equipment further includes a receiver 530, where the receiver 530 is configured to: perform, in the processor 510, each data modulation symbol in the n data modulation symbols in a time domain. Spreading, and before performing time domain spreading on the pilot modulation symbols, receiving indication information sent by the base station, where the indication information is used to indicate information of a spreading code used by the spread spectrum data modulation symbol and a spread pilot modulation symbol The information of the spreading code used, and the information of the time-frequency transmission unit that maps the spread data modulation symbols and the spread pilot modulation symbols.
  • the N is equal to 1;
  • the transmitter 520 is specifically configured to: map the symbol included in the spread ith data modulation symbol and the symbol included in the spread pilot modulation symbol to the ith time-frequency transmission in a staggered manner
  • the time-frequency transmission unit of the unit set includes Orthogonal Frequency Division Multiplexing (OFDM) symbols and transmits to the base station.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the processor 510 is specifically configured to: perform N times time domain spreading on each data modulation symbol by using an M long time domain spreading code, and transmit the frequency through the m long time domain spreading code.
  • the modulation symbol performs N times time domain spreading, N is greater than or equal to 2, and the M long time domain spreading code includes M elements, and the m long time domain spreading code includes m elements;
  • the transmitter 520 is specifically configured to: map the spread i-th data modulation symbol and the spread pilot modulation symbol to the i-th time-frequency transmission unit set and send the same to the base station by: The i-th data modulation symbol of the hth time domain spreading and the pilot modulation symbol of the hth time domain spreading are mapped to the hth time-frequency transmission unit in the ith time-frequency transmission unit set and transmitted
  • the h is an integer and takes values from 1 to N.
  • the transmitter 520 is specifically configured to:
  • the h-th time-frequency transmission unit of the set of frequency transmission units is included in an OFDM symbol and transmitted to the base station.
  • the processor 510 is further configured to: before the transmitter 520 maps each of the data modulation symbols and the spread pilot modulation symbols that are spread in the spread of the n data modulation symbols, Each data modulation symbol is frequency domain spread, and the pilot modulation symbols are frequency domain spread.
  • the user equipment 500 according to the embodiment of the present invention may correspond to the user equipment in the information transmission method according to the embodiment of the present invention, and may correspond to the corresponding flow of the information transmission method 100 according to the embodiment of the present invention. This will not be repeated here.
  • a modulation symbol (a data modulation symbol or a pilot modulation symbol) as a basic unit for spreading
  • the basic granularity of the spread spectrum becomes small, it is possible to avoid multiple repetitions of the block spread spectrum data packet exceeding the channel correlation.
  • the signals between the receiving side users caused by the time are not orthogonal and thus the despreading performance is degraded.
  • the signal transmission time of the user equipment can be more flexibly coordinated, and multiplexing and signal transmission between the user equipments can be arranged.
  • FIG. 11 is a schematic block diagram of a base station 600 in accordance with an embodiment of the present invention. As shown in FIG. 11, the base station 600 includes a processor 620 and a receiver 610;
  • the receiver 610 is configured to: receive a signal on a set of n time-frequency transmission units corresponding to the user equipment, where each time-frequency transmission unit set in the set of the n time-frequency transmission units is mapped to have a spread spectrum in the following manner a data modulation symbol and a spread spectrum pilot adjustment symbol: the n time-frequency transmission unit sets included in the set of n time-frequency transmission units are mapped to n data modulation symbols on the N time-frequency transmission units a spread spectrum of the i-th data modulation symbol and a pilot-spread pilot modulation symbol, the n being an integer greater than 1, the i being an integer and taking a value from 1 to n, the N being an integer greater than or equal to 1;
  • the processor 620 is configured to: despread the time domain spreading code used by the spread spectrum of the n data modulation symbols and the time domain spreading code used by the spread pilot modulation symbols.
  • the n soft demodulation symbols corresponding to the spread data n data modulation symbols are detected, and the n soft demodulation symbols are decoded and verified.
  • the base station further includes a transmitter 630, where the transmitter 630 is configured to: before the receiver 610 receives a signal on the set of n time-frequency transmission units corresponding to the user equipment, And transmitting, to the user equipment, indication information, where the indication information is used to indicate information of a spreading code used when spreading the data modulation symbol, and information of a spreading code used when spreading the pilot modulation symbol, And mapping information of the spread spectrum data modulation symbols and the spread spectrum pilot symbols of the time-frequency transmission unit.
  • the N time-frequency transmission units included in the set of the i-th time-frequency transmission units in the set of the n time-frequency transmission units in the set of the n time-frequency transmission units received by the receiver 610 are mapped with n data modulations that are spread spectrum.
  • the ith data modulation symbol of the spread spectrum in the symbol and the pilot modulation symbol mapped with the spread spectrum include:
  • the symbols included in the i-th data modulation symbol of the kth time domain spread spectrum and the symbols included in the k-th time-domain spread pilot modulation symbol are mapped in a staggered manner on the ith time-frequency transmission unit set.
  • the k is a positive integer less than or equal to N.
  • the processor 620 is specifically configured to:
  • the processor 620 is specifically configured to:
  • the time domain spreading code used for the n data modulation symbols of the spread spectrum and the frequency domain spreading code used, and the time domain spreading code used for the spread pilot modulation symbols and the frequency domain extension used The frequency code, from the received signal, despreads and detects the n soft demodulation symbols.
  • the base station 600 according to the embodiment of the present invention may correspond to the base station in the information transmission method according to the embodiment of the present invention, and may correspond to the corresponding flow of the information transmission method 200 according to the embodiment of the present invention. Let me repeat.
  • a time-frequency transmission unit set code division multiplexing a signal that is spread by a plurality of user equipments in units of modulation symbols, and the base station performs despreading on the set of time-frequency transmission units according to spreading codes used by each user equipment, for example, joint data symbols and pilot symbols.
  • the maximum likelihood detects a soft demodulation symbol of each of the plurality of two user equipments. Since the basic granularity of the spread spectrum becomes smaller, the data is reduced from one data packet to one modulation symbol, so that the multiple repetition times of the block spread spectrum data packet can be avoided longer than the channel correlation time, and the signals between the receiving side users are not orthogonal and thus the solution The problem of reduced performance. Moreover, since the granularity of the spread spectrum is small, the signal transmission time of the user equipment can be more flexibly coordinated, and multiplexing and signal transmission between the user equipments can be arranged.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
  • the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or made as a standalone product When used, it can be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential to the prior art or part of the technical solution, may be embodied in the form of a software product stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .

Abstract

L'invention concerne un procédé et un dispositif de transmission d'informations. Le procédé consiste à effectuer respectivement un étalement dans le domaine temporel sur chaque symbole de modulation de données de n symboles de modulation de données d'un paquet de données à transmettre, et à effectuer, par rapport à chaque symbole de modulation de données, un étalement dans le domaine temporel sur un symbole de modulation pilote, n étant un entier positif supérieur à 1 ; et à mapper le ième symbole de modulation de données soumis à un étalement dans le domaine temporel et le symbole de modulation pilote à spectre étalé par rapport au ième symbole de modulation de données sur le ième ensemble d'unités de transmission de temps-fréquence et à l'envoyer, i étant un entier positif et sa valeur étant comprise entre 1 et n, et le ième ensemble d'unités de transmission de temps-fréquence comprenant N unités de transmission de temps-fréquence. Les modes de réalisation de l'invention permettent d'éviter la réduction de la performance de désétalement et de coordonner de manière plus souple la durée de transmission d'un signal d'équipement utilisateur.
PCT/CN2013/089090 2013-12-11 2013-12-11 Procédé et dispositif de transmission d'informations WO2015085514A1 (fr)

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CN201380003745.7A CN104995886B (zh) 2013-12-11 2013-12-11 信息传输方法和装置

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