WO2013079034A1 - 下行数据发送、接收方法及基站与用户终端 - Google Patents
下行数据发送、接收方法及基站与用户终端 Download PDFInfo
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- WO2013079034A1 WO2013079034A1 PCT/CN2012/085742 CN2012085742W WO2013079034A1 WO 2013079034 A1 WO2013079034 A1 WO 2013079034A1 CN 2012085742 W CN2012085742 W CN 2012085742W WO 2013079034 A1 WO2013079034 A1 WO 2013079034A1
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- downlink signal
- downlink
- user terminal
- signal
- downlink data
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
- H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
Definitions
- the highest-order modulation mode supported by the 3GPP Long Term Evolution (LTE) system is 64 Quadrature Amplitude Modulation (QAM).
- QAM Quadrature Amplitude Modulation
- the LTE system needs to support more.
- High-order modulation methods such as 256QAM, 1024QAM, etc., especially in indoor small coverage scenarios, the channel quality is better, users can obtain higher signal-to-noise ratio, which provides feasible for 256QAM, 1024QAM and other modulation methods.
- Sex The performance of modulation modes such as 256QAM and 1024QAM depends on the Error Vector Magnitude (EVM) indicator of the transmitted signal. The lower the EVM, the better the demodulation performance at the receiving end.
- EVM Error Vector Magnitude
- the downlink data of the LTE system is the Orthogonal Frequency Division Multiplexing (OFDM) modulation method for transmitting downlink data, and the peak-to-average power ratio of the OFDM-modulated signal (Peak Average Power Rate) Abbreviation: PAPR) is high, and the EVM index that can be achieved is also high. It is not suitable for supporting high-order modulation modes such as 256QAM and 1024QAM, thus limiting the data rate. In addition, when the downlink data is transmitted using the OFDM modulation scheme, the user at the cell edge cannot be effectively served.
- OFDM Orthogonal Frequency Division Multiplexing
- the present invention provides a downlink data transmission and reception method, and a base station and a user terminal, which are used to solve the problem that the downlink data of the existing LTE system cannot be increased by the OFDM signal characteristic, and the data rate of the downlink data is improved, and the data rate is improved.
- the quality of service of users at the edge of the cell is improved.
- the embodiment of the invention provides a downlink data sending method, including:
- the first downlink data is modulated into a first downlink signal by using a discrete Fourier transform-spread-orthogonal frequency division multiplexing DFT-S-OFDM modulation method;
- the second downlink data is modulated into a second downlink signal by using an orthogonal frequency division multiplexing OFDM modulation method
- the first downlink signal and the second downlink signal are multiplexed to form a downlink transmission signal, and are sent to the user terminal.
- the embodiment of the invention provides a downlink data receiving method, including:
- control information of the first downlink signal includes a modulation mode corresponding to the first downlink signal and a resource location of a resource used to send the first downlink signal, where the first downlink signal is a base station Modulating the first downlink data by using a discrete Fourier transform-spread-orthogonal frequency division multiplexing DFT-S-0FDM modulation method;
- An embodiment of the present invention provides a base station, including:
- a first generating module configured to modulate the first downlink data into a first downlink signal by using a discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-0FDM) modulation method;
- DFT-S-0FDM discrete Fourier transform-spread-orthogonal frequency division multiplexing
- a second generating module configured to modulate the second downlink data into a second downlink signal by using an Orthogonal Frequency Division Multiplexing (OFDM) OFDM modulation method;
- OFDM Orthogonal Frequency Division Multiplexing
- the first sending module is configured to form a downlink transmission signal in a multiplexing manner by the first downlink signal generated by the first generation module and the second downlink signal generated by the second generation module, and send the downlink transmission signal to the user terminal.
- the embodiment of the invention provides a user terminal, including:
- An acquiring module configured to acquire control information of the first downlink signal, where the control information includes a modulation mode corresponding to the first downlink signal and a resource bit of a resource used to send the first downlink signal
- the first downlink signal is a base station using discrete Fourier transform-spread-orthogonal frequency division multiplexing
- DFT-S-OFDM modulation mode modulates the first downlink data
- a receiving module configured to receive, by using a modulation manner in the control information, the first downlink signal sent by the base station, on a resource identified by a resource location in the control information acquired by the acquiring module.
- the downlink data transmitting and receiving method and the base station and the user terminal in the embodiment of the present invention simultaneously use the DFT-S-OFDM and OFDM modulation modes to respectively modulate the first downlink data and the second downlink data, and adopt the multiplexing manner.
- the first downlink signal and the second downlink signal respectively modulated by the DFT-S-OFDM and the OFDM are sent to the user terminal, so that the downlink data that cannot be increased in data rate by the OFDM limitation can select the DFT-S-OFDM modulation mode, and the solution is solved.
- Part of the downlink data is limited by OFDM and cannot increase the data rate, which improves the data rate of downlink data.
- FIG. 1A is a flowchart of a downlink data sending method according to an embodiment of the present invention.
- FIG. 1B is a schematic diagram of a resource allocation when a base station first downlink signal and a second downlink signal are multiplexed in the same subframe;
- FIG. 1C is a schematic diagram of resource allocation when a base station transmits a first downlink signal and a second downlink signal through different subframes respectively;
- 2A is a flowchart of a method for transmitting downlink data according to another embodiment of the present invention.
- FIG. 2B is a schematic diagram of resource allocation of a radio frame according to another embodiment of the present invention
- FIG. 2C is a schematic diagram of numbering DFT-S-OFDM symbols in multiple subframes according to another embodiment of the present invention
- FIG. 3 is a flowchart of a method for receiving downlink data according to an embodiment of the present invention
- FIG. 4 is a flowchart of a downlink data processing method according to an embodiment of the present invention.
- FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention.
- FIG. 6 is a schematic structural diagram of a base station according to another embodiment of the present disclosure
- FIG. 7 is a schematic structural diagram of a user terminal according to an embodiment of the present invention.
- the present invention provides a simultaneous OFDM-based and discrete Fourier transform-spread-orthogonal frequency division complex.
- DFT-S-0FDM Discrete Fourier Transformation-Spreading-OFDM
- the PAPR of OFDM is higher, and the EVM index that can be achieved is also relatively high, and the data rate of the downlink data is improved; or, in DFT-S-OFDM,
- the expansion module realizes the coverage extension of the downlink signal and improves the quality of service for the user terminal at the edge of the cell.
- FIG. 1A is a flowchart of a method for transmitting downlink data according to an embodiment of the present invention. As shown in FIG. 1A, the method in this embodiment includes:
- Step 101 The base station modulates the first downlink data into a first downlink signal by using a DFT-S-0FDM modulation mode.
- the data sent by the base station to the user terminal may use different digital modulation methods, such as 64QAM, 256QAM, and the like.
- the required EVM index is higher, and OFDM can be used to modulate transmission.
- the required EVM index is lower, and the EVM index that OFDM can achieve is higher, so it cannot meet the requirements. Due to the low PAPR of DFT-S-0FDM, the EVM index that can be achieved is low, which is suitable for transmitting downlink data with lower requirements for EVM indicators.
- the digital modulation method requiring lower EVM index mainly refers to 256QAM and digital modulation mode with order higher than 256QAM; and the number lower than 256QAM.
- Modulation methods such as 64QAM, 16QAM, Quadrature Phase Shift Keying (QPSK), etc., EVM indicators can be higher to reduce costs.
- the first downlink data may include: downlink data modulated by using 256QAM or higher order digital modulation.
- the signal quality is generally worse than that of the user terminal at the cell center.
- the downlink data corresponding to the user terminal at the cell edge is Need to enhance the receive signal to noise ratio. That is to say, the base station can also use DFT-S-OFDM to transmit downlink data to user terminals at the cell edge.
- the downlink data is also digitally modulated, and the digital modulation method used is not limited.
- the first downlink data may further include: downlink data that is required to be received by the user terminal at the cell edge for digital modulation.
- the first downlink data in this embodiment includes: downlink data modulated by using 256QAM or higher order digital modulation, and/or downlink of the user terminal at the cell edge that needs to receive digital modulation. data.
- DFT-S-OFDM and OFDM are modulation methods used when transmitting digitally modulated downlink data, which is different from digital modulation.
- the base station determines the first downlink data from all the downlink data, and then modulates the first downlink data by using a modulation method such as DFT-S-OFDM to form a first downlink signal.
- a modulation method such as DFT-S-OFDM
- Step 102 The base station modulates the second downlink data into the second downlink signal by using an OFDM modulation mode.
- the second downlink data in this embodiment mainly refers to the second downlink data in the cell center, and the required PAPR permission is higher, and the required EVM index is also higher, and OFDM is used. This modulation method can be sent to meet the relevant requirements.
- the second downlink data in this embodiment may include a broadcast channel, a synchronization channel, a control channel, and a cell-specific reference signal (CRS).
- the control channel may be a physical downlink control channel (Physical Downlink Control Channel; PDCCH), a Physical Control Format Indicator Channel (PCFICH), or a physical hybrid.
- PDCCH Physical Downlink Control Channel
- PCFICH Physical Control Format Indicator Channel
- PHICH automatic HARQ Indicator Channel
- the base station determines the second downlink data, and modulates the second downlink data by using a modulation mode of OFDM to form a second downlink signal.
- Step 103 The base station forms a downlink transmission signal in a multiplexing manner by the first downlink signal and the second downlink signal, and sends the downlink transmission signal to the user terminal.
- the base station For the first downlink signal modulated by the DFT-S-OFDM and the second downlink signal modulated by the OFDM, the base station sends the first downlink signal and the second downlink signal to the second downlink signal by using resources such as time and space in a multiplexing manner.
- resources such as time and space in a multiplexing manner.
- the base station may transmit the OFDM symbol of the first downlink signal and the OFDM symbol of the second downlink signal to different OFDM symbol positions in the same subframe, and send at least one same subframe to the user terminal. That is, the base station transmits the first downlink signal and the second downlink signal to the user terminal through the same subframe.
- the base station may further send the first downlink signal and the second downlink signal to the user terminal through different subframes.
- the subframe refers to a time resource, which may be a subframe defined in the LTE system.
- Each sub-frame is 1 millisecond (ms), and the sub-frames are divided into 14-hour intervals.
- Each small time period is called an OFDM symbol, and an OFDM symbol is about 70 microseconds (us) long.
- FIG. 1B is a schematic diagram of resource allocation when a base station multiplexes a first downlink signal and a second downlink signal in the same subframe.
- the 1st, 2nd, 3rd, 8th, 9th, 10th, and 11th OFDM symbols are allocated to the second downlink signal, and the 4th, 5th, 6th, 7th, 12th, 13th, and 14th OFDM symbols are allocated. Is assigned to the first downlink signal.
- FIG. 1C is a schematic diagram of resource allocation when a base station transmits a first downlink signal and a second downlink signal through different subframes respectively. As shown in FIG. 1C, the first subframe is allocated to the second downlink signal, and the second subframe is allocated to the first downlink signal.
- the base station distinguishes the first downlink data that requires the EVM index from the downlink data and the second downlink data that requires the EVM index to be higher from the downlink data, and then uses the DFT-S-0FDM and the OFDM respectively.
- the modulation mode modulates the first downlink data and the second downlink data, and performs transmission in a multiplex manner, and implements the downlink data to the user terminal, and satisfies the requirements of different downlink data on the EVM index, so that the user terminal can obtain Better demodulation performance, which can improve the transmission rate of downlink data, and solve the part when using OFDM to transmit downlink data.
- the downlink data is affected by the characteristics of OFDM itself, and the transmission rate cannot be increased, resulting in a problem that the data rate of the entire downlink data is limited.
- FIG. 2A is a flowchart of a method for transmitting downlink data according to another embodiment of the present invention. As shown in FIG. 2A, the method in this embodiment includes:
- Step 201 The base station modulates the first downlink data into a first downlink signal by using a DFT-S-OFDM modulation mode.
- Step 202 The base station modulates the second downlink data into a second downlink signal by using an OFDM modulation mode.
- steps 201 and 202 can be referred to the descriptions of step 101 and step 102, and are not described herein again.
- Step 203 The base station sends control information of the first downlink signal and the second downlink signal to the user terminal, respectively.
- the control information of the first downlink signal mainly includes: a modulation mode corresponding to the first downlink signal and a resource location of a resource used to send the first downlink signal.
- the modulation mode corresponding to the first downlink signal is a modulation mode used to modulate the first downlink signal, that is, DFT-S-0FDM.
- the resource location of the resource used for transmitting the first downlink signal mainly refers to the location, number, and the like of the OFDM symbol occupied by the first downlink signal, for example: when the first downlink signal and the second downlink signal are multiplexed in the same subframe
- the resource location of the resource used for transmitting the first downlink signal mainly refers to an OFDM symbol number occupied by the first downlink signal in the multiplexed subframe, for example, 4th, 5th, 6th, 7th, 12th, and 13th. 14 OFDM symbols.
- the resource location of the resource used for transmitting the first downlink signal mainly refers to a subframe position occupied by the first downlink signal, for example, the second The first to the 14th OFDM symbols of the subframe.
- the resources here can also be resources in the frequency domain.
- the base station may send the control information of the first downlink signal to the user terminal by using a radio resource control protocol (Radio Resource Control; RRC for short) signaling. That is, the RRC signaling includes a modulation mode corresponding to the first downlink signal and/or a resource location of resources used for transmitting the first downlink signal.
- RRC Radio Resource Control
- the base station usually sends the digital modulation method used by the downlink data, such as 64QAM, 16QAM, etc., to the user terminal through the control signaling transmitted in the PDCCH, and sends the specified resource location to the user terminal.
- the user terminal In order for the user terminal to correctly receive downlink data.
- the user terminal For making With the downlink data of the digital modulation mode of 256QAM, the user terminal can determine that the modulation mode used for reception is DFT-S-OFDM according to the digital modulation mode notified by the control signaling.
- the base station may also send the control information of the first downlink signal to the user terminal by using the extended or modified PDCCH (mainly referred to as control signaling transmitted in the PDCCH) by extending or modifying the PDCCH.
- the base station may extend a new field in the PDCCH, and the new field carries the modulation mode corresponding to the first downlink signal, and the resource location of the resource used for transmitting the first downlink signal is still carried by the field in the existing protocol.
- the base station can modify the definition of a certain field in the existing PDCCH, so that the field is used to carry the modulation mode corresponding to the first downlink signal, and the resource location of the resource used for transmitting the first downlink signal is still used.
- the fields in the protocol are carried.
- the base station sends the control information of the second downlink signal to the user terminal by using RRC signaling. Or the base station sends the control information of the second downlink signal to the user terminal by using the PDCCH.
- the manner of transmitting the control information of the second downlink signal to the user terminal is the same as that of the prior art, and details are not described herein.
- Step 204 The base station forms a downlink transmission signal in a multiplexing manner by the first downlink signal and the second downlink signal, and sends the downlink transmission signal to the user terminal.
- the base station For the first downlink signal modulated by the DFT-S-OFDM and the second downlink signal modulated by the OFDM, the base station sends the first downlink signal and the second downlink signal to the second downlink signal by using resources such as time and space in a multiplexing manner.
- resources such as time and space in a multiplexing manner.
- the base station may multiplex the first downlink signal and the second downlink signal to different user OFDM symbol positions in the same subframe and send the information to the user terminal.
- the base station may further send the first downlink signal and the second downlink signal to the user terminal through different subframes.
- the first downlink signal in one subframe may be simultaneously received by multiple user terminals, and the first downlink signal that needs to be received by different user terminals may be multiplexed in a time division multiplexing or code division multiplexing manner.
- the subframe may be a subframe multiplexed with the second downlink signal, or may be a subframe occupied by the first downlink signal separately.
- the allocated time-frequency resources are usually part of all time-frequency resources in the system that can be used to transmit the first downlink signal.
- the base station sends the control information of the first downlink signal to the user terminal, that is, the time-frequency resources of all the downlink signals that can be used for transmitting the DFT-S-OFDM modulation in the system are sent to the user terminal.
- a radio frame is composed of 10 subframes of length 1 ms, and each subframe has 14 OFDM symbols.
- the 0th, 1st, 5th, and 6th subframes are used for transmitting the second downlink signal modulated by OFDM (the second downlink signal is represented by OFDM in FIG. 2B); the second and seventh subframes are used for transmitting uplink.
- the modulated first downlink signal (DFT in FIG. 2B represents the first downlink signal).
- the first subframe and the sixth subframe are TDD special subframes, each of which has an idle OFDM symbol (ie, a portion indicated by a hatched line in the figure) and an OFDM symbol for uplink transmission. Special subframes are also usually treated as downlink subframes. Based on the resource usage shown in FIG.
- the subframe that the base station sends to the user terminal in step 203 to transmit the DFT-S-OFDM modulated first downlink signal is the third subframe, the fourth subframe, and the eighth subframe.
- the ninth subframe, and the user terminal is notified that the first downlink signal of the DFT-S-OFDM modulation is transmitted in the foregoing subframe except that the first OFDM symbol transmits the second downlink signal of the OFDM modulation.
- an OFDM symbol transmitting a DFT-S-OFDM modulated first downlink signal is referred to as a DFT-S-OFDM symbol
- an OFDM symbol transmitting a second downlink signal of an OFDM modulation is referred to as an OFDM symbol.
- the OFDM symbol for the sake of distinction, abbreviates the original OFDM symbol in the subframe as a symbol.
- the base station transmits the time-frequency resource of the first downlink signal to the user terminal, all the symbols occupied by the first downlink signal that the user terminal needs to receive (ie, all DFT-S)
- the position of the -OFDM symbol and the modulation scheme corresponding to the first downlink signal are collected and transmitted to the user terminal once by one subframe.
- the base station aggregates the DFT-S-OFDM symbol resources in all subframes for joint indication instead of performing an indication in each subframe.
- the DFT-S-OFDM symbol resources in the third subframe, the fourth subframe, the eighth subframe, and the ninth subframe are grouped together for joint indication, that is, through RRC signaling or modified.
- the DFT-S-OFDM symbol resources in the third subframe, the fourth subframe, the eighth subframe, and the ninth subframe are collected and reported to the user terminal through one subframe, and the first The modulation mode DFT-S-OFDM corresponding to a downlink signal is sent to the user terminal.
- the base station aggregates all DFT-S-OFDM symbol resources corresponding to the two radio frames to perform joint indication, by using one The subframe is sent to the user terminal once.
- the base station when transmitting, by the base station, the time-frequency resource for transmitting the first downlink signal, the base station may also use the radio frame as a reference, and in each radio frame, the first user terminal needs to receive the first
- the symbol position occupied by the downlink signal in the radio frame is sent to the user terminal at a time, and the modulation mode corresponding to the first downlink signal is sent to the user terminal in one of the radio frames.
- the DFT-S-OFDM symbol resources in the third subframe, the fourth subframe, the eighth subframe, and the ninth subframe in the radio frame are collectively combined to perform an indication, that is, through the RRC letter.
- the DFT-S-OFDM symbol resources in the third subframe, the fourth subframe, the eighth subframe, and the ninth subframe are collected and sent to the user terminal in the radio frame, At the same time, the modulation mode DFT-S-OFDM corresponding to the first downlink signal is also sent to the user terminal in the radio frame.
- the base station when transmitting, by the base station, the time-frequency resource for transmitting the first downlink signal, the base station may further specify the number of subframes that are jointly indicated, and then the first downlink that the user terminal needs to receive.
- the signal is transmitted to the user terminal at a symbol position occupied by the specified number of subframes, and the modulation mode corresponding to the first downlink signal is sent to the user terminal in the sending process.
- the symbol position and the first occupied by the first downlink signal that the user terminal needs to receive in a specified number of subframes are sent to the user terminal at a time, that is, through one RRC signaling or one extended or modified PDCCH.
- the modulation mode corresponding to the downlink signal is sent to the user terminal.
- the specified number of subframes may be composed of all downlink subframes that include DFT-S-OFDM symbols in each radio frame.
- the specified number of subframes may also be composed of all downlink subframes including DFT-S-OFDM symbols in each half of the radio frames, as shown in FIG. 2B, that is, DFT in the third subframe and the fourth subframe.
- the S-OFDM symbol resources are grouped together for joint indication, and the DFT-S-OFDM symbol resources in the 8th subframe and the ninth subframe are aggregated for joint indication.
- the specified number of subframes may also be composed of downlink subframes including DFT-S-OFDM symbols in downlink subframes that feed back uplink response information in the same subframe, and FIG.
- 2B is taken as an example, in each half of the radio frames.
- the manner in which the base station transmits the time-frequency resource for transmitting the first downlink signal to the user terminal is not limited to one notification per subframe, and multiple methods may be used.
- the base station may specifically indicate the location information of the DFT-S-OFDM symbol allocated to the user terminal, or indicate the allocation to the user terminal.
- the base station may uniformly number each OFDM symbol as a virtual DFT-S-OFDM symbol, or skip the OFDM symbol, The DFT-S-OFDM symbols are numbered uniformly. Taking FIG.
- each subframe is composed of 14 symbols
- the first symbol of each subframe is an OFDM symbol (eg, The shaded portion in Fig. 2C)
- the remaining 13 symbols are DFT-S-OFDM symbols.
- the symbols in the four subframes may be numbered as symbol 0 to symbol 13, symbol 14 to symbol 27, symbol 28 to symbol 41, respectively.
- Symbols 42 to 55 indicate allocation of symbols 1 to 7 for the first user terminal, assignment of symbols 8 to 30 for the second user terminal, and assignment of symbols 31 to 55 for the third user terminal.
- the OFDM symbol may be skipped and mapped only on the DFT-S-OFDM symbol, for example, the third symbol.
- the third user terminal knows that the symbol 42 is an OFDM symbol, then when the data information is mapped onto the assigned symbol, the symbol 42 is skipped, only the symbol 31 to the symbol 41. And mapping is performed on symbols 43 to 55.
- the DFT-S-OFDM symbols in the four subframes may be numbered as symbols 0 to 12, symbols 13 to 25, and symbols 26 to Symbol 38, symbol 39 to symbol 51, assign symbols 0 to 6 for the first user terminal, assign symbols 7 to 27 for the second user terminal, and assign symbols 28 to 51 for the third user terminal.
- a small time period in one subframe is still referred to as one OFDM symbol in the subsequent description.
- the demodulation pilot signal that demodulates the first downlink signal (that is, the demodulation pilot signal corresponding to the first downlink signal) is sent to the user.
- the terminal ensures that the user terminal can correctly demodulate the first downlink signal.
- the demodulation pilot signal may include: a CRS and/or a demodulation reference signal (Demodulation Reference Signal; referred to as: DMRS).
- the base station modulates the demodulation pilot signal corresponding to the first downlink signal to a different OFDM symbol position than the first downlink signal.
- the resource allocation structure shown in FIG. 1B is taken as an example, where the demodulation pilot signal corresponding to the first downlink signal may be located in one of the 1, 2, 3, 8, 9, 10, and 11 OFDM symbols or Multiple OFDM symbol positions.
- the demodulation pilot signal corresponding to the first downlink signal may be located at one or more OFDM symbol positions in the first subframe.
- the demodulation pilot signal corresponding to the first downlink signal includes demodulation pilot signals of multiple user terminals, and then the first downlink signal In the corresponding demodulation pilot signal, the demodulation pilot signals of the at least one user terminal are multiplexed in the at least one OFDM symbol position by the following multiplexing method:
- Time division multiplexing code division multiplexing, frequency division multiplexing, or hybrid multiplexing of the above multiplexing methods.
- the base station distinguishes the first downlink data that requires the EVM index from the downlink data and the second downlink data that allows the EVM index to be higher, and then uses the DFT-S-0FDM and the OFDM respectively.
- the modulation mode modulates the first downlink signal and the second downlink signal, and performs transmission by multiplexing, and implements the downlink data to the user terminal, and satisfies the requirements of different downlink data on the EVM index, so that the user terminal can obtain
- the demodulation performance is better, so that the transmission rate of the downlink data can be improved, and the problem that the downlink data is transmitted by using OFDM and the downlink data is not affected by the characteristics of the OFDM cannot improve the transmission rate, resulting in limited data rate of the entire downlink data.
- the base station notifies the user terminal of the control information of the first downlink signal, so that the user terminal learns the resource location of receiving the first downlink signal and the demodulation mode used to receive the first downlink signal, The user terminal successfully receives the first downlink signal and performs channel estimation, which completes the demodulation and decoding of the first downlink signal.
- FIG. 3 is a flowchart of a downlink data receiving method according to an embodiment of the present invention. As shown in FIG. 3, the method in this embodiment includes:
- Step 301 The user terminal acquires control information of the first downlink signal, where the control information includes a modulation mode corresponding to the first downlink signal and a resource location of a resource used to send the first downlink signal.
- the first downlink signal is generated by the base station using the DFT-S-0FDM modulation mode to generate and transmit the first downlink data.
- the first downlink data includes: downlink data modulated by using 256QAM or higher order digital modulation, and/or user terminals at the edge of the cell need to be connected The received downlink data after digital modulation.
- the base station determines the first downlink data from the downlink data, and then modulates the first downlink data by using a DFT-S-OFDM modulation manner to generate a first downlink signal.
- the base station determines the second downlink data from the downlink data, and then modulates the second downlink data by using the OFDM modulation method to generate a second downlink signal.
- the base station sends the first downlink signal and the second downlink signal to the user terminal in a multiplexed manner.
- the base station sends the control information of the first downlink signal and the control information of the second downlink signal to the user terminal.
- the control information of the first downlink signal includes a modulation mode corresponding to the first downlink signal and a resource location of a resource used for transmitting the first downlink signal; and the modulation mode corresponding to the first downlink signal is the first time that the base station modulates
- the modulation mode used by the row signal that is, DFT-S-0FDM
- the resource location of the resource used for transmitting the first downlink signal includes the position and number of OFDM symbols occupied by the first signal.
- the control information of the second downlink signal includes a modulation mode corresponding to the second downlink signal and a resource position of a resource used for transmitting the second downlink signal.
- the control information of the first downlink signal may be sent to the user terminal through RRC signaling.
- the user terminal acquires control information of the first downlink signal from the RRC signaling by receiving the RRC signaling.
- the base station may further send the control information of the first downlink signal to the user terminal by using the extended or modified PDCCH.
- the user terminal acquires control information of the first downlink signal from the modified or extended PDCCH by receiving the extended or modified PDCCH.
- the base station sends the time-frequency resource for transmitting the first downlink signal to the user terminal, and correspondingly, the user terminal may be in the RRC signaling or the modified or extended PDCCH in one subframe.
- the control signaling of the transmission acquires all OFDM symbol positions occupied by the first downlink signal that it needs to receive and the modulation mode corresponding to the first downlink signal.
- the one subframe may be pre-agreed.
- the user terminal may obtain the OFDM symbol position occupied by the first downlink signal that needs to be received in the radio frame from the RRC signaling or the modified or extended PDCCH on each radio frame and/or the first The modulation method corresponding to a downlink signal.
- the user terminal may acquire, from one RRC signaling or one modified or extended PDCCH, the OFDM symbol and/or the first occupied by the first downlink signal that it needs to receive in a specified number of subframes.
- the base station may further send control information of the second downlink signal to the user terminal by using RRC signaling or a PDCCH. Since the second downlink signal is a signal modulated by using OFDM, the transmission mode is the same as that in the prior art, and will not be described in detail herein.
- Step 302 The user terminal receives the first downlink signal sent by the base station by using a modulation mode in the control information on the resource identified by the resource location in the control information.
- the user terminal may receive the first downlink signal sent by the base station according to the acquired control information. Specifically, the user terminal receives the first downlink signal on the OFDM symbol identified by the resource location in the control information, and uses a modulation mode in the control information, that is, a receiver or a receiving mode corresponding to the DFT-S-OFDM. Then, the user terminal performs channel estimation on the received first downlink signal, and performs demodulation and decoding on the first downlink signal.
- a modulation mode in the control information that is, a receiver or a receiving mode corresponding to the DFT-S-OFDM.
- the user terminal also receives the second downlink signal, and the process of receiving the second downlink signal is the same as the prior art, and is not described in detail herein.
- the user terminal cooperates with the base station to obtain the control information of the first downlink signal, complete the reception of the first downlink signal according to the acquired control information, and enable the base station to use the DFT at the same time.
- -S-0FDM and OFDM modulation methods are used to transmit downlink data, satisfying the requirements of different downlink data for EVM indicators, and improving the data rate of downlink data.
- FIG. 4 is a flowchart of a downlink data processing method according to an embodiment of the present invention. As shown in FIG. 4, the method in this embodiment includes:
- Step 401 The base station determines the first downlink data and the second downlink data from the downlink data, and modulates the first downlink data and the second downlink data by using DFT-S-0FDM and OFDM, respectively, to generate a first downlink. Signal and second downlink signal.
- Step 402 The base station specifies the occupied OFDM symbol position and number for the first downlink signal and the second downlink signal, and sends control information of the first downlink signal and the second downlink signal to the user terminal.
- the control information includes: a modulation mode, a specified OFDM symbol position and/or a number, and the like.
- Step 403 The user terminal receives control information of the first downlink signal and the second downlink signal sent by the base station.
- Step 404 The base station sends the first downlink signal and the second downlink signal to the user end in a multiplexing manner.
- Step 405 The user terminal receives the first downlink signal and the second downlink signal sent by the base station according to the control information of the first downlink signal and the control information of the second downlink signal, respectively.
- the base station distinguishes the first downlink data that requires the EVM index from the downlink data and the second downlink data that allows the EVM index to be higher, and then uses the DFT-S-OFDM and the OFDM respectively.
- the modulation mode modulates the first downlink data and the second downlink data, and performs transmission in a multiplex manner, and implements the downlink data to the user terminal, and satisfies the requirements of different downlink data on the EVM index, so that the user terminal can obtain
- the demodulation performance is better, so that the transmission rate of the downlink data can be improved, and the problem that the downlink data is transmitted by using OFDM and the downlink data is not affected by the characteristics of the OFDM cannot improve the transmission rate, resulting in limited data rate of the entire downlink data. .
- FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 5, the base station in this embodiment includes: a first generating module 51, a second generating module 52, and a first sending module 53.
- the first generating module 51 is configured to modulate the first downlink data into the first downlink signal by using a DFT-S-0FDM modulation mode.
- the second generating module 52 is configured to modulate the second downlink data into the second downlink signal by using an OFDM modulation mode.
- the first sending module 53 is respectively connected to the first generating module 51, the second generating module 52, and the user terminal, and is configured to modulate the first downlink signal modulated by the first generating module 51 and the second generating module 52.
- the two downlink signals form a downlink transmission signal in a multiplexing manner and are sent to the user terminal.
- the first downlink data may include: downlink data modulated by using 256QAM or higher order digital modulation, and/or downlink data that is received by the user terminal at the cell edge and that is to be received by using digital modulation.
- the second downlink data may include: a process in which the user terminal in the cell center needs to receive the downlink function of the method shown in FIG. 1A, and the specific working principle is not described here. For details, refer to the method embodiment. description of.
- the base station in this embodiment uses the first generation module and the second generation module to modulate the first downlink data and the second downlink data by using two different modulation modes: DFT-S-0FDM and OFDM, respectively, and adopts the first sending module.
- Use multiplexing to complete the transmission in the implementation to the user terminal While transmitting downlink data, it satisfies the requirements of different downlink data for EVM indicators, so that the user terminal can obtain better demodulation performance, thereby improving the transmission rate of downlink data, and solving part of downlink data when transmitting downlink data by using OFDM. Due to the characteristics of OFDM itself, the transmission rate cannot be increased, resulting in a problem that the data rate of the entire downlink data is limited.
- FIG. 6 is a schematic structural diagram of a base station according to another embodiment of the present invention. This embodiment is implemented based on the embodiment shown in FIG. 5, as shown in FIG.
- the first sending module 53 is connected to the user terminal, and is configured to form a downlink transmission signal in a multiplexing manner by using the first downlink signal and the second downlink signal, and send the first downlink signal to the user terminal by using RRC signaling.
- the control information of the downlink signal is sent to the user terminal, or the control information of the first downlink signal is sent to the user terminal by using the extended or modified PDCCH; the control information includes the debugging mode and the sending corresponding to the first downlink signal.
- the resource location of the resource used by the first downlink signal is configured to form a downlink transmission signal in a multiplexing manner by using the first downlink signal and the second downlink signal, and send the first downlink signal to the user terminal by using RRC signaling.
- the control information of the downlink signal is sent to the user terminal, or the control information of the first downlink signal is sent to the user terminal by using the extended or modified PDCCH; the control information includes the debugging mode and the sending corresponding to the first downlink signal.
- the first sending module 53 is specifically configured to send, by using one subframe, all the OFDM symbol positions occupied by the first downlink signal that the same user terminal needs to receive and the modulation mode corresponding to the first downlink signal to the user terminal.
- the first sending module 53 is specifically configured to use, by using one radio frame, the OFDM symbol position occupied by the first downlink signal that the same user terminal needs to receive in the radio frame, and/or the modulation mode corresponding to the first downlink signal.
- the first sending module 53 is specifically configured to use the OFDM symbol position and/or the first downlink signal occupied by the first downlink signal that the same user terminal needs to receive in a specified number of subframes.
- the corresponding modulation mode is sent to the user terminal through one RRC signaling or one extended or modified PDCCH.
- the base station in this embodiment further includes: a third sending module 62.
- the third sending module 62 is connected to the first generating module 51, and configured to modulate the demodulation pilot signal corresponding to the first downlink signal to a different OFDM symbol position than the first downlink signal.
- the demodulation pilot signal may be CRS or DMRS.
- the third sending module 62 is specifically configured to: when the first downlink signal is received by the multiple user terminals, multiplex the demodulation pilot signals of the at least one user terminal in the at least one OFDM symbol position by using the following multiplexing manner:
- the first sending module 53 of the embodiment is specifically configured to carry the OFDM symbol of the first downlink signal and the OFDM symbol of the second downlink signal in different OFDM symbol positions in the same subframe, and At least one of the same subframes is transmitted to the user terminal.
- the first sending module 53 is further configured to send the first downlink signal and the second downlink signal to the user terminal through different subframes.
- the first sending module 53 is configured to multiplex the first downlink signal corresponding to different user terminals in the same subframe in the corresponding OFDM symbol position by using time division multiplexing or code division multiplexing. User terminal.
- the base station in this embodiment separately modulates the first downlink data and the second downlink data by using two different modulation modes: DFT-S-0FDM and OFDM, and performs transmission by using the multiplexing mode by the first sending module,
- DFT-S-0FDM and OFDM different modulation modes
- OFDM orthogonal frequency division multiplexing
- FIG. 7 is a schematic structural diagram of a user terminal according to an embodiment of the present invention. As shown in FIG. 7, the user terminal of this embodiment includes: an obtaining module 71 and a receiving module 72.
- the acquiring module 71 is configured to acquire control information of the first downlink signal, where the control information includes a modulation mode corresponding to the first downlink signal and a resource location of a resource used to send the first downlink signal, where the first The line signal is generated and transmitted by the base station using the DFT-S-0FDM modulation method to modulate the first downlink data.
- the receiving module 72 is connected to the acquiring module 71 and the base station, and is configured to receive, by using the modulation mode in the control information, the first downlink signal sent by the base station, on the resource identified by the resource location in the control information acquired by the acquiring module 71.
- the receiving module 72 of this embodiment may also be configured to receive other downlink signals, such as a second downlink signal modulated using OFDM.
- the receiving module 72 can also be used to receive demodulation pilot signals, such as CRS or DMRS, for demodulating the first downlink signal.
- the obtaining module 71 is specifically configured to receive the RRC signaling, and obtain the control information of the first downlink signal from the RRC signaling; or specifically, to receive the extended or modified PDCCH, from the extended or modified PDCCH. Obtaining control information of the first downlink signal.
- the obtaining module 71 is more specifically used in one subframe, from RRC signaling or through expansion. Obtaining, in the PDCCH or the modified PDCCH, all OFDM symbol positions occupied by the first downlink signal that the user terminal needs to receive and a modulation mode corresponding to the first downlink signal. Alternatively, the obtaining module 71 is configured to obtain, on each radio frame, the first downlink signal that the user terminal needs to receive from the RRC signaling or the extended or modified PDCCH, which is occupied by the radio frame. The OFDM symbol position and/or the modulation scheme corresponding to the first downlink signal.
- the obtaining module 71 is specifically configured to acquire, from an RRC signaling or an extended or modified PDCCH, an OFDM symbol position occupied by the first downlink signal that the user terminal needs to receive in a specified number of subframes and/or Or the modulation mode corresponding to the first downlink signal.
- the function modules of the user terminal in this embodiment can be used to perform the process of the downlink data receiving method shown in FIG. 3, and the specific working principle is not described here. For details, refer to the description of the method embodiment.
- the user terminal provided in this embodiment cooperates with the base station provided by the embodiments of the present invention, and first acquires control information of the first downlink signal generated by the base station using the DFT-S-0FDM modulation mode to modulate the first downlink data, and then The DFT-S-0FDM is used to successfully receive the first downlink signal on the identified resource according to the obtained control information, so that the base station can simultaneously use the DFT-S-0FDM and OFDM modulation modes to transmit downlink data to meet different downlink data.
- the requirements for the EVM indicator increase the data rate of the downlink data.
- the foregoing storage device includes the following steps:
- the foregoing storage medium includes: a ROM, a RAM, a magnetic disk, or an optical disk, and the like, which can store various program codes.
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Abstract
本发明实施例提供一种下行数据发送、接收方法及基站与用户终端。其中发送方法包括:使用DFT-S-OFDM调制方式将第一下行数据调制成第一下行信号;使用OFDM调制方式将第二下行数据调制成第二下行信号;将第一下行信号和第二下行信号以复用方式形成下行发射信号,发送给用户终端。其中,基站包括:第一生成模块、第二生成模块和第一发送模块。本发明技术方案分别使用DFT-S-OFDM和OFDM两种调制方式来发送下行数据,满足不同下行数据对EVM指标的要求,解决了下行数据受OFDM特性限制无法提高数据速率的问题,提高了下行数据的数据速率。
Description
下行数据发送、 接收方法及基站与用户终端
本申请要求了于 2011年 12月 2日提交中国专利局,申请号为 201110394758.4、 发明名称为 "下行数据发送、 接收方法及基站与用户终端" 的中国申请的优 先权, 其全部内容通过引用结合在本申请中。 技术领域 本发明涉及移动通信技术, 尤其涉及一种下行数据发送、 接收方法及基 站与用户终端。 背景技术 随着用户业务量的指数增长, 无线资源日益成为非常紧缺的资源, 而通 过在有限的频谱资源上进一步提高频谱效率来提供更高的数据速率, 成为无 线通信迫切要解决的问题。
目前, 3GPP长期演进(Long Term Evolution; 简称为: LTE ) 系统支持 的最高阶调制方式是 64正交幅度调制 ( Quadrature Amplitude Modulation; 简 称为: QAM ), 为了进一步提高频谱效率, LTE系统需要支持更高阶的调制方 式, 例如 256QAM、 1024QAM等, 特别是在室内小覆盖的场景下, 信道质量 比较好, 用户可以获得较高的信噪比, 这为 256QAM、 1024QAM等调制方式 的应用提供了可行性。 256QAM、 1024QAM等调制方式的性能依赖于发射信 号的误差向量幅度( Error Vector Magnitude; 简称为: EVM )指标, EVM越 低, 在接收端的解调性能就越好。 目前, LTE系统的下行数据都是使用正交频分复用 ( Orthogonal Frequency Division Multiplexing; 简称为: OFDM )调制方式来发送下行数 据的, OFDM调制出的信号的峰均功率比(Peak Average Power Rate; 简称 为: PAPR )高,能达到的 EVM指标也比较高,不适合支持 256QAM、 1024QAM 等高阶调制方式, 因此限制了数据速率的提高。 另外, 使用 OFDM调制方式 发送下行数据时也不能有效服务处于小区边缘的用户。
发明内容 本发明提供一种下行数据发送、 接收方法及基站与用户终端, 用以解决 现有 LTE系统下行数据受 OFDM信号特性限制无法提高数据速率的问题,提高 下行数据的数据速率, 并提高对处于小区边缘的用户的服务质量。
本发明实施例提供一种下行数据发送方法, 包括:
使用离散傅里叶变化-扩展-正交频分复用 DFT-S-OFDM调制方式将第一 下行数据调制成第一下行信号;
使用正交频分复用 OFDM调制方式将第二下行数据调制成第二下行信 号;
将所述第一下行信号和所述第二下行信号以复用方式形成下行发射信 号, 发送给用户终端。
本发明实施例提供一种下行数据接收方法, 包括:
获取第一下行信号的控制信息, 所述控制信息包括所述第一下行信号对 应的调制方式和发送所述第一下行信号所用资源的资源位置, 所述第一下行 信号是基站使用离散傅里叶变化-扩展-正交频分复用 DFT-S-0FDM调制方式 对第一下行数据进行调制生成的;
在所述控制信息中的资源位置所标识的资源上, 使用所述控制信息中的 调制方式接收所述基站发送的所述第一下行信号。
本发明实施例提供一种基站, 包括:
第一生成模块, 用于使用离散傅里叶变化-扩展-正交频分复用 DFT-S-0FDM调制方式将第一下行数据调制成第一下行信号;
第二生成模块, 用于使用正交频分复用 OFDM调制方式将第二下行数据 调制成第二下行信号;
第一发送模块, 用于将所述第一生成模块生成的第一下行信号和所述第 二生成模块生成的第二下行信号以复用方式形成下行发射信号, 发送给用户 终端。
本发明实施例提供一种用户终端, 包括:
获取模块, 用于获取第一下行信号的控制信息, 所述控制信息包括所述 第一下行信号对应的调制方式和发送所述第一下行信号所用资源的资源位
置, 所述第一下行信号是基站使用离散傅里叶变化-扩展-正交频分复用
DFT-S-OFDM调制方式对第一下行数据进行调制生成的;
接收模块, 用于在所述获取模块获取的控制信息中的资源位置所标识的 资源上, 使用所述控制信息中的调制方式接收所述基站发送的所述第一下行 信号。 本发明实施例的下行数据发送、 接收方法及基站与用户终端, 同时使用 DFT-S-OFDM和 OFDM两种调制方式分别对第一下行数据和第二下行数据进 行调制, 并通过复用方式将 DFT-S-OFDM和 OFDM分别调制出的第一下行信 号和第二下行信号发送给用户终端, 使得受 OFDM限制无法提高数据速率的 下行数据可以选择 DFT-S-OFDM调制方式, 解决了部分下行数据受 OFDM限 制无法提高数据速率的问题, 提高了下行数据的数据速率。 附图说明 为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面将对实 施例或现有技术描述中所需要使用的附图作一简单地介绍, 显而易见地, 下 面描述中的附图是本发明的一些实施例, 对于本领域普通技术人员来讲, 在 不付出创造性劳动的前提下, 还可以根据这些附图获得其他的附图。
图 1A为 本发明一实施例提供的下行数据发送方法的流程图;
图 1 B为基站第一下行信号和第二下行信号复用在同一子帧中传输时的一 种资源分配示意图;
图 1 C为基站将第一下行信号和第二下行信号分别通过不同子帧传输时的 一种资源分配示意图;
图 2A为本发明另一实施例提供的下行数据发送方法的流程图;
图 2B为本发明另一实施例提供的无线帧的一种资源分配示意图; 图 2C为本发明另一实施例提供的在多个子帧中对 DFT-S-OFDM符号进 行编号的一种示意图;
图 3为本发明一实施例提供的下行数据接收方法的流程图;
图 4为本发明一实施例提供的下行数据处理方法的流程图;
图 5为本发明一实施例提供的基站的结构示意图;
图 6为本发明另一实施例提供的基站的结构示意图;
图 7为本发明一实施例提供的用户终端的结构示意图。
具体实施方式 为使本发明实施例的目的、 技术方案和优点更加清楚, 下面将结合本发 明实施例中的附图, 对本发明实施例中的技术方案进行清楚、 完整地描述, 显然, 所描述的实施例是本发明一部分实施例, 而不是全部的实施例。 基于 本发明中的实施例, 本领域普通技术人员在没有作出创造性劳动前提下所获 得的所有其他实施例, 都属于本发明保护的范围。
为解决现有 LTE系统使用 OFDM调制方式发送下行数据时,因 OFDM本身 特性导致数据速率无法提高的问题, 本发明提供了一种同时基于 OFDM和离 散 傅 里 叶 变 化 - 扩 展 - 正 交 频 分 复 用 ( Discrete Fourier Transformation-Spreading-OFDM简称为: DFT-S-0FDM ) 两种调制方式发 送下行数据的方法, 通过 DFT-S-0FDM弥补 OFDM在发送某些特定下行数据 时其自身的各种缺陷,例如,解决使用 OFDM发送由 256QAM调制出的下行数 据时, OFDM的 PAPR较高, 所能达到的 EVM指标也比较高的缺陷, 提高下行 数据的数据速率; 或者, 利用 DFT-S-OFDM中的扩展模块, 实现下行信号的 覆盖扩展, 提高对处于小区边缘的用户终端的服务质量。 下面将通过具体实 施例详细说明本发明技术方案。
图 1A为 本发明一实施例提供的下行数据发送方法的流程图。 如图 1A所 示, 本实施例的方法包括:
步骤 101、基站使用 DFT-S-0FDM调制方式将第一下行数据调制成第一下 行信号。
在实际应用中, 基站下发给用户终端的数据可以使用不同的数字调制方 式, 例如 64QAM、 256QAM等。 对于一些数字调制方式调制出的下行数据, 其要求的 EVM指标较高, 可以使用 OFDM来调制发送。 对于另一些数字调制 方式调制出的下行数据,为了保证接收端具有较好的解调性能,其要求的 EVM 指标较低, 而 OFDM所能达到的 EVM指标较高, 故无法满足要求。 由于 DFT-S-0FDM的 PAPR较低,所能达到的 EVM指标较低,适合用于发送对 EVM 指标要求较低的下行数据。 其中, 要求 EVM指标较低的数字调制方式主要是 指 256QAM和阶数高于 256QAM的数字调制方式;而阶数低于 256QAM的数字
调制方式, 例如 64QAM、 16QAM、 四相相移键控( Quadrature Phase Shift Keying; 简称为: QPSK )等, EVM指标可以较高, 以降低成本。
故在本实施例中, 第一下行数据可以包括: 使用 256QAM或更高阶的数 字调制方式调制出的下行数据。
另外, 对于处于小于边缘的用户终端, 其信号质量与处于小区中心的用 户终端相比一般较差, 为了能够更好地接收基站下发的下行数据, 处于小区 边缘的用户终端所对应的下行数据需要增强接收信噪比。 也就是说, 基站同 样可以使用 DFT-S-OFDM向处于小区边缘的用户终端发送下行数据。 其中, 所述下行数据也经过了数字调制, 所使用的数字调制方式不做限定。
故在本实施例中, 第一下行数据还可以包括: 处于小区边缘的用户终端 需要接收的进行数字调制后的下行数据。
综上可见, 本实施例的第一下行数据包括: 使用 256QAM或更高阶的数 字调制方式调制出的下行数据, 和 /或处于小区边缘的用户终端需要接收应的 进行数字调制后的下行数据。
其中, DFT-S-OFDM和 OFDM是传输经数字调制后下行数据时, 所使用 的调制方式, 与数字调制方式不同。
基于上述, 基站从所有下行数据中确定出第一下行数据, 然后使用 DFT-S-OFDM这种调制方式对第一下行数据进行调制, 形成第一下行信号。
步骤 102、 基站使用 OFDM调制方式将第二下行数据调制成第二下行信 号。
基于第一下行数据, 本实施例的第二下行数据主要是指处于小区中心的 对于第二下行数据来说,其所要求的 PAPR允许较高,所要求的 EVM指标 也较高, 使用 OFDM这种调制方式来发送可以满足相关要求。
另外, 为了实现后向兼容, 对于某些下行数据仍需要釆用 OFDM这种调 制方式来调制。 故从后向兼容角度来看, 本实施例的第二下行数据可以包括 广播信道、同步信道、控制信道和小区公共参考信号( Cell-specific Reference Signal;简称为: CRS )等。其中,控制信道可以是物理下行控制信道( Physical Downlink Control Channel; 简称为: PDCCH ) 、 物理控制格式指示信道 ( Physical Control Format Indicator Channel; 简称为: PCFICH )或物理混
合自动请求重传指示信道 ( Physical HARQ Indicator Channel ; 简称为: PHICH )等。
具体的, 基站确定出第二下行数据, 并使用 OFDM这种调制方式对第二 下行数据进行调制, 形成第二下行信号。
步骤 103、基站将第一下行信号和第二下行信号以复用方式形成下行发射 信号, 发送给用户终端。
对于使用 DFT-S-OFDM调制出的第一下行信号和使用 OFDM调制出的第 二下行信号, 基站通过复用方式使用时间、 空间等资源将第一下行信号和第 二下行信号发送给用户终端。
例如: 基站可以将第一下行信号的 OFDM符号和第二下行信号的 OFDM 符号承载于同一子帧的不同 OFDM符号位置, 将至少一个同一子帧发送给用 户终端。 即基站将第一下行信号和第二下行信号通过相同的子帧发送给用户 终端。
又例如: 基站还可以将第一下行信号和第二下行信号, 分别通过不同子 帧发送给用户终端。
其中, 子帧是指一种时间资源, 可以是 LTE系统中定义的子帧。 每个子帧 为 1毫秒(ms ) , —个子帧被划分为 14个小时间段, 每个小时间段被称为一 个 OFDM符号, 一个 OFDM符号长度大约为 70微妙 ( us ) 。
图 1 B为基站将第一下行信号和第二下行信号复用在同一子帧中传输时的 一种资源分配示意图。 如图 1 B所示, 第 1、 2、 3、 8、 9、 10、 1 1个 OFDM符 号被分配给第二下行信号, 第 4、 5、 6、 7、 12、 13、 14个 OFDM符号被分配 给第一下行信号。 图 1 C为基站将第一下行信号和第二下行信号分别通过不同 子帧传输时的一种资源分配示意图。如图 1 C所示, 第 1子帧分配给第二下行信 号, 第 2子帧分配给第一下行信号。
在本实施例中, 基站从下行数据中区分出要求 EVM指标较低的第一下行 数据和要求 EVM指标较高的第二下行数据, 然后分别使用 DFT-S-0FDM和 OFDM两种不同的调制方式对第一下行数据和第二下行数据进行调制, 并通 过复用方式完成发送, 在实现向用户终端发送下行数据的同时, 满足不同下 行数据对 EVM指标的要求, 使得用户终端能够得到较好的解调性能, 从而使 得可以提高下行数据的发送速率, 解决了使用 OFDM发送下行数据时, 部分
下行数据受 OFDM本身特性影响无法提高发送速率, 导致整个下行数据的数 据速率受限的问题。
图 2A为本发明另一实施例提供的下行数据发送方法的流程图。 如图 2A所 示, 本实施例的方法包括:
步骤 201、基站使用 DFT-S-OFDM调制方式将第一下行数据调制成第一下 行信号。
步骤 202、 基站使用 OFDM调制方式将第二下行数据调制成第二下行信 号。
上述步骤 201和步骤 202可参见步骤 101和步骤 102的描述, 在此不再赘 述。
步骤 203、基站将第一下行信号和第二下行信号的控制信息分别发送给用 户终端。
其中, 第一下行信号的控制信息主要包括: 第一下行信号对应的调制方 式和发送第一下行信号所用资源的资源位置。 其中, 第一下行信号对应的调 制方式即调制出第一下行信号所使用的调制方式, 亦即 DFT-S-0FDM。 发送 第一下行信号所用资源的资源位置主要是指第一下行信号所占用的 OFDM符 号的位置、 个数等, 例如: 当第一下行信号和第二下行信号复用在同一子帧 时, 发送第一下行信号所用资源的资源位置主要是指在所复用的子帧内第一 下行信号所占用的 OFDM符号号, 例如第 4、 5、 6、 7、 12、 13、 14个 OFDM 符号。 又例如: 当第一下行信号和第二下行信号分别占用不同子帧时, 发送 第一下行信号所用资源的资源位置主要是指第一下行信号所占用的子帧位 置, 例如第二子帧的第 1个-第 14个 OFDM符号。 当然, 这里的资源也可以是 频域上的资源。
其中, 基站可以通过无线资源控制协议(Radio Resource Control; 简称 为: RRC )信令, 将第一下行信号的控制信息发送给用户终端。 即 RRC信令 中包括第一下行信号所对应的调制方式和 /或发送第一下行信号所用资源的资 源位置。
另外, 在现有技术中, 基站通常会通过 PDCCH中传输的控制信令将下行 数据所使用的数字调制方式, 例如 64QAM、 16QAM等发送给用户终端, 并将 指定的资源位置发送给用户终端, 以使用户终端正确接收下行数据。 对于使
用 256QAM这种数字调制方式的下行数据, 用户终端可以根据控制信令通告 的数字调制方式确定接收时所使用的调制方式为 DFT-S-OFDM。 但是, 对处 于小区边缘的用户终端需要接收的下行数据, 由于其所使用的数字调制方式 不限, 故用户终端无法根据控制信令通告的数字调制方式确定出使用哪种调 制方式来接收。 故在本实施例中, 基站还可以通过扩展或修改 PDCCH , 通过 扩展的或修改后的 PDCCH (主要是指 PDCCH中传输的控制信令)将第一下 行信号的控制信息发送给用户终端。 例如: 基站可以在 PDCCH中扩展新的字 段, 通过新的字段携带第一下行信号对应的调制方式, 而对于发送第一下行 信号所用资源的资源位置仍使用现有协议中的字段携带。 又例如: 基站可以 修改现有 PDCCH中的某个字段的定义, 使该字段用来携带第一下行信号对应 的调制方式, 而对于发送第一下行信号所用资源的资源位置仍使用现有协议 中的字段携带。
进一步, 基站通过 RRC信令, 将第二下行信号的控制信息发送给用户终 端。 或者基站通过 PDCCH , 将第二下行信号的控制信息发送给用户终端。 对 于向用户终端发送第二下行信号的控制信息的方式与现有技术相同, 在此不 再赘述。
步骤 204、基站将第一下行信号和第二下行信号以复用方式形成下行发射 信号, 发送给用户终端。
对于使用 DFT-S-OFDM调制出的第一下行信号和使用 OFDM调制出的第 二下行信号, 基站通过复用方式使用时间、 空间等资源将第一下行信号和第 二下行信号发送给用户终端。
例如: 基站可以将第一下行信号和第二下行信号, 复用在同一子帧的不 同的 OFDM符号位置上发送给用户终端。
又例如: 基站还可以将第一下行信号和第二下行信号, 分别通过不同子 帧发送给用户终端。
其中, 对于一个子帧中的第一下行信号可能会被多个用户终端同时接收, 不同用户终端需要接收的第一下行信号可以使用时分复用或码分复用的方式 复用在该子帧中。 所述子帧可以是与第二下行信号复用的子帧, 也可以是由 第一下行信号单独占用的子帧。
不论是将第一下行信号和第二下行信号分别通过同一子帧中的不同符号
位置发送给用户终端, 还是将第一下行信号和第二下行信号分别通过不同子 帧发送给用户终端, 对于使用 DFT-S-OFDM调制的第一下行信号的一个用户 终端来说, 为其分配的时频资源, 通常是系统中所有可用于传输第一下行信 号的时频资源的一部分。 在步骤 203中, 基站将第一下行信号的控制信息发送 给用户终端, 即将系统中所有可用于传输 DFT-S-OFDM调制的第一下行信号 的时频资源发送给用户终端。 以 LTE 时分双工 (Time Division Duplexing; 简称为: TDD ) 系统为例, 一个无线帧由 10个长度为 1 ms的子帧组成, 每个 子帧有 14个 OFDM符号组成。如图 2B所示,第 0、 1、 5、 6子帧用于传输由 OFDM 调制的第二下行信号 (图 2B中用 OFDM代表第二下行信号) ; 第 2、 7子帧用 于传输上行信号 (图中用 UL代表上行信号) ; 第 3子帧、 第 4子帧、 第 8子帧 和第 9子帧中除了第一个 OFDM符号外的资源都可以用于传输 DFT-S-OFDM 调制的第一下行信号 (图 2B中用 DFT代表第一下行信号) 。 第 1子帧和第 6子 帧是 TDD特殊子帧, 其中分别有一个空闲 OFDM符号(即图中斜线所示部分) 和一个用于上行传输的 OFDM符号。 特殊子帧通常也被当作下行子帧看待。 基于图 2B所示资源使用, 基站在步骤 203中发送给用户终端可用于传输 DFT-S-OFDM调制的第一下行信号的子帧为第 3子帧、第 4子帧、第 8子帧和第 9子帧, 并会告知用户终端在上述子帧中除第一个 OFDM符号传输 OFDM调制 的第二下行信号外、 其余符号均传输 DFT-S-OFDM调制的第一下行信号。
为描述方便, 在下面的描述中, 将传输 DFT-S-OFDM调制的第一下行信 号的 OFDM符号称为 DFT-S-OFDM符号, 将传输 OFDM调制的第二下行信号 的 OFDM符号称为 OFDM符号, 为示区别,将子帧中的原来的 OFDM符号简称 为符号。 对于一个用户终端来说, 基站在向该用户终端发送传输第一下行信 号的时频资源时, 可以将该用户终端需要接收的第一下行信号所占用的所有 符号 (即所有 DFT-S-OFDM符号) 的位置和第一下行信号所对应的调制方式 集中起来, 通过一个子帧一次发送给该用户终端。 例如, 基站将所有子帧中 的 DFT-S-OFDM符号资源集中起来进行联合指示, 而不是在每个子帧中均进 行一次指示。 以图 2B为例, 即将第 3子帧、 第 4子帧、 第 8子帧和第 9子帧中的 DFT-S-OFDM符号资源集中起来进行联合指示, 即通过 RRC信令或经过修改 的或扩展的 PDCCH , 将第 3子帧、 第 4子帧、 第 8子帧和第 9子帧中的 DFT-S-OFDM符号资源集中起来通过一个子帧通告给用户终端, 同时也将第
一下行信号对应的调制方式 DFT-S-OFDM发送给用户终端。 假设该用户终端 对应的 DFT-S-0FDM符号同时存在两个无线帧中, 则基站将该用户终端对应 于两个无线帧中的所有 DFT-S-OFDM符号资源集中起来进行联合指示, 通过 一个子帧一次发送给用户终端。
对于一个用户终端来说, 基站在向该用户终端发送传输第一下行信号的 时频资源时, 还可以以无线帧为基准, 在每个无线帧中, 将同一用户终端需 要接收的第一下行信号在该无线帧中所占用的符号位置一次发送给用户终 端, 并在其中一个无线帧中将第一下行信号所对应的调制方式发送给用户终 端。 以图 2B为例, 即将该无线帧中的第 3子帧、 第 4子帧、 第 8子帧和第 9子帧 中的 DFT-S-OFDM符号资源集中起来进行联合指示, 即通过 RRC信令或经过 修改的或扩展的 PDCCH将第 3子帧、 第 4子帧、 第 8子帧和第 9子帧中的 DFT-S-OFDM符号资源集中起来在该无线帧中发送给用户终端, 同时在该无 线帧中也将第一下行信号所对应的调制方式 DFT-S-OFDM发送给用户终端。
对于一个用户终端来说, 基站在向该用户终端发送传输第一下行信号的 时频资源时, 还可以预先指定联合指示的子帧个数, 然后将该用户终端需要 接收的第一下行信号在指定个数个子帧中所占用的符号位置一次发送给用户 终端, 并在该次发送过程中中将第一下行信号所对应的调制方式发送给用户 终端。 其中, 一次发送给用户终端也就是说通过一条 RRC信令或一个扩展的 或修改的 PDCCH将该用户终端需要接收的第一下行信号在指定个数个子帧 中所占用的符号位置和第一下行信号所对应的调制方式发送给用户终端。 其 中, 所述指定个数个子帧可以是由每个无线帧中含有 DFT-S-OFDM符号的所 有下行子帧组成。 所述指定个数个子帧还可以是由每半个无线帧中含有 DFT-S-OFDM符号的所有下行子帧组成, 以图 2B为例, 即将第 3子帧和第 4子 帧中的 DFT-S-OFDM符号资源集中起来进行联合指示, 将第 8子帧和第 9子帧 中的 DFT-S-OFDM符号资源集中起来进行联合指示。 所述指定个数个子帧还 可以是由在相同子帧反馈上行应答信息的下行子帧中含 DFT-S-OFDM符号的 下行子帧组成, 以图 2B为例, 在每半个无线帧中有 4个下行子帧和 1个上行子 帧, 假设第 9子帧和第 3子帧的上行应答信息在第 7子帧反馈, 第 4子帧和第 8 子帧的上行应答信息在第 2子帧反馈, 于是将第 9子帧和子第 3帧中的 DFT-S-OFDM符号资源集中起来进行联合指示, 将第 4子帧和第 8子帧中的
DFT-S-OFDM符号资源集中起来进行联合指示。
由上述可见, 基站在向该用户终端发送传输第一下行信号的时频资源的 方式并不限于每个子帧进行一次通告, 可以使用多种方式。
基站在将用户终端所占用的 DFT-S-OFDM符号资源集中起来进行联合指 示的过程中,具体可以指示为用户终端分配的 DFT-S-OFDM符号的位置信息, 或者指示为用户终端分配的起始 DFT-S-OFDM符号和连续分配的 DFT-S-OFDM符号数。 其中, 基站在将用户终端所占用的 DFT-S-OFDM符号 资源集中起来的过程中, 可以将每个 OFDM符号作为一个虚拟的 DFT-S-OFDM符号统一进行编号, 或者跳过 OFDM符号、 仅对 DFT-S-OFDM 符号统一进行编号。 以图 2C所示为例, 假设要将 4个子帧的 DFT-S-OFDM符 号集中起来进行联合指示, 其中每个子帧由 14个符号组成, 每个子帧的第一 个符号是 OFDM符号 (如图 2C中的斜线部分所示) , 剩下的 13个符号为 DFT-S-OFDM符号。 当将每个 OFDM符号作为一个虚拟的 DFT-S-OFDM符号 统一进行编号时, 可以将 4个子帧中的符号分别编号为符号 0〜符号 13、 符号 14〜符号 27、 符号 28〜符号 41、 符号 42〜符号 55, 为第一用户终端指示分配符 号 1〜符号 7, 为第 2用户终端指示分配符号 8〜符号 30, 为第 3用户终端指示分 配符号 31〜符号 55。 此时, 如果用户终端获知为其分配了符号中包含 OFDM符 号时, 在将数据信息映射到分配到的符号时, 可以跳过 OFDM符号, 只在 DFT-S-OFDM符号上映射, 例如第 3用户终端获知为其分配了符号 31〜符号 55 时, 第 3用户终端知道符号 42是 OFDM符号, 那么在将数据信息映射到分配的 符号上时,跳过符号 42、只在符号 31〜符号 41以及符号 43〜符号 55上进行映射。 当跳过 OFDM符号、仅对 DFT-S-OFDM符号统一进行编号时, 可以将 4个子帧 中的 DFT-S-OFDM符号分别编号为符号 0〜符号 12、符号 13〜符号 25、符号 26~ 符号 38、 符号 39〜符号 51 , 为第 1用户终端指示分配符号 0〜符号 6, 为第 2用户 终端指示分配符号 7〜符号 27, 为第 3用户终端指示分配符号 28〜符号 51。
在后续描述中仍将一个子帧中的一个小时间段称为一个 OFDM符号。 另外, 基站将第一下行信号发送给用户终端时, 还会将解调该第一下行 信号的解调导频信号 (即第一下行信号对应的解调导频信号)发送给用户终 端, 以保证用户终端能够正确解调第一下行信号。 其中, 解调导频信号可以 包括: CRS和 /或解调参考信号 ( Demodulation Reference Signal; 简称为:
DMRS ) 。
在本实施例中, 基站将第一下行信号对应的解调导频信号调制到与第一 下行信号不同的 OFDM符号位置上。 以图 1 B所示资源分配结构为例, 其中, 第一下行信号对应的解调导频信号可以位于第 1、 2、 3、 8、 9、 10、 1 1个 OFDM 符号中其中一个或多个 OFDM符号位置上。 以图 1 C所示资源分配结构为例, 第一下行信号对应的解调导频信号可以位于第一子帧中一个或多个 OFDM符 号位置上。
进一步, 当第一下行信号同时被多个用户终端接收时, 第一下行信号对 应的解调导频信号就会包括多个用户终端的解调导频信号, 则在第一下行信 号对应的解调导频信号中, 将至少一个用户终端的解调导频信号通过以下复 用方式复用在至少一个 OFDM符号位置上:
时分复用、 码分复用、 频分复用或上述复用方式的混合复用方式。
在本实施例中, 基站从下行数据中区分出要求 EVM指标较低的第一下行 数据和允许 EVM指标较高的第二下行数据, 然后分别使用 DFT-S-0FDM和 OFDM两种不同的调制方式对第一下行信号和第二下行信号进行调制, 并通 过复用方式完成发送, 在实现向用户终端发送下行数据的同时, 满足不同下 行数据对 EVM指标的要求, 使得用户终端能够得到较好的解调性能, 从而使 得可以提高下行数据的发送速率, 解决了使用 OFDM发送下行数据时, 部分 下行数据受 OFDM本身特性影响无法提高发送速率, 导致整个下行数据的数 据速率受限的问题。 进一步, 在本实施例中, 基站通过向用户终端通告第一 下行信号的控制信息, 使用户终端获知接收第一下行信号的资源位置以及接 收第一下行信号所使用的解调方式, 为用户终端成功接收第一下行信号, 并 进行信道估计, 完成对第一下行信号的解调译码打下了基础。
图 3为本发明一实施例提供的下行数据接收方法的流程图。 如图 3所示, 本实施例的方法包括:
步骤 301、 用户终端获取第一下行信号的控制信息, 所述控制信息包括第 一下行信号对应的调制方式和发送第一下行信号所用资源的资源位置。
在本实施例中, 第一下行信号是基站使用 DFT-S-0FDM调制方式对第一 下行数据进行调制生成并发送的。 第一下行数据包括: 使用 256QAM或更高 阶的数字调制方式调制出的下行数据, 和 /或处于小区边缘的用户终端需要接
收的进行数字调制后的下行数据。
具体的,基站从下行数据中确定出第一下行数据,然后使用 DFT-S-OFDM 调制方式对第一下行数据进行调制, 生成第一下行信号。
同时, 基站从下行数据中确定出第二下行数据, 然后使用 OFDM调制方 式对第二下行数据进行调制, 生成第二下行信号。
然后, 基站将第一下行信号和第二下行信号以复用方式发送给用户终端。 在基站将第一下行信号和第二下行信号以复用方式发送给用户终端之 前, 基站将第一下行信号的控制信息和第二下行信号的控制信息发送给用户 终端。 其中, 第一下行信号的控制信息包括第一下行信号对应的调制方式和 发送第一下行信号所用资源的资源位置; 第一下行信号对应的调制方式即为 基站调制出第一下行信号所使用的调制方式, 即 DFT-S-0FDM, 发送第一下 行信号所用资源的资源位置包括第一信号所占用的 OFDM符号位置和个数 等。 第二下行信号的控制信息包括第二下行信号对应的调制方式和发送第二 下行信号所用资源的资源位置。
对基站来说, 可以通过 RRC信令, 将第一下行信号的控制信息发送给用 户终端。 相应地, 用户终端通过接收 RRC信令, 从 RRC信令中获取第一下行 信号的控制信息。
另外, 基站还可以通过扩展的或修改的 PDCCH , 将第一下行信号的控制 信息发送给用户终端。 相应地, 用户终端通过接收经过扩展的或修改的 PDCCH , 从经过修改的或扩展的 PDCCH中获取第一下行信号的控制信息。
针对上述实施例中基站向用户终端发送传输第一下行信号的时频资源的 几种方式, 相应地, 用户终端可以在一个子帧上, 从 RRC信令或经过修改的 或扩展的 PDCCH中传输的控制信令中获取其需要接收的第一下行信号所占 用的所有 OFDM符号位置和第一下行信号所对应的调制方式。 其中, 所述一 个子帧可以预先约定。 或者, 用户终端可以在每个无线帧上, 从 RRC信令或 经过修改的或扩展的 PDCCH中获取其需要接收的第一下行信号在该无线帧 中所占用的 OFDM符号位置和 /或第一下行信号所对应的调制方式。 或者, 用 户终端可以从一条 RRC信令或一个经过修改的或扩展后的 PDCCH中一次获 取其需要接收的第一下行信号在指定个数个子帧中所占用的 OFDM符号和 /或 第一下行信号所对应的调制方式。
其中,基站还可以通过 RRC信令或 PDCCH , 将第二下行信号的控制信息 发送给用户终端。 由于第二下行信号是使用 OFDM调制出的信号, 其传输方 式与现有技术相同, 在此不再详述。
步骤 302、 用户终端在控制信息中的资源位置所标识的资源上, 使用控制 信息中的调制方式接收基站发送的第一下行信号。
当用户终端获取到第一下行信号的控制信息后, 就可以根据获取的控制 信息接收基站发送的第一下行信号。 具体的, 用户终端在控制信息中的资源 位置所标识的 OFDM符号上,并使用控制信息中的调制方式,即 DFT-S-OFDM 对应的接收机或接收方式来接收第一下行信号。 然后, 用户终端对接收到的 第一下行信号进行信道估计, 完成对第一下行信号的解调译码。
其中, 用户终端还会接收第二下行信号, 接收第二下行信号的过程与现 有技术相同, 在此不再详述。
本实施例提供的下行数据接收方法, 用户终端与基站相配合, 通过获取 第一下行信号的控制信息, 根据所获取的控制信息完成对第一下行信号的接 收, 使基站可以同时使用 DFT-S-0FDM和 OFDM两种调制方式来发送下行数 据, 满足不同下行数据对 EVM指标的要求, 提高了下行数据的数据速率。
图 4为本发明一实施例提供的下行数据处理方法的流程图。 如图 4所示, 本实施例的方法包括:
步骤 401、基站从下行数据中确定出第一下行数据和第二下行数据, 并分 别使用 DFT-S-0FDM和 OFDM对第一下行数据和第二下行数据进行调制, 生 成第一下行信号和第二下行信号。
步骤 402、基站为第一下行信号和第二下行信号指定所占用的 OFDM符号 位置和个数, 并将第一下行信号的和第二下行信号的控制信息发送给用户终 端。
其中, 控制信息包括: 调制方式、 指定占用的 OFDM符号位置和 /或个数 等。
步骤 403、用户终端接收基站发送的第一下行信号的和第二下行信号的控 制信息。
步骤 404、基站将第一下行信号和第二下行信号以复用方式发送给用户终
步骤 405、用户终端分别根据第一下行信号的控制信息和第二下行信号的 控制信息, 接收基站发送的第一下行信号和第二下行信号。
其中, 上述步骤 401、 步骤 402、 步骤 404可参见图 1A或图 2A所示实施例 的描述, 在此不再赘述。
上述步骤 403和步骤 405可参见图 3所示实施例的描述, 在此不再赘述。 在本实施例中, 基站从下行数据中区分出要求 EVM指标较低的第一下行 数据和允许 EVM指标较高的第二下行数据, 然后分别使用 DFT-S-OFDM和 OFDM两种不同的调制方式对第一下行数据和第二下行数据进行调制, 并通 过复用方式完成发送, 在实现向用户终端发送下行数据的同时, 满足不同下 行数据对 EVM指标的要求, 使得用户终端能够得到较好的解调性能, 从而使 得可以提高下行数据的发送速率, 解决了使用 OFDM发送下行数据时, 部分 下行数据受 OFDM本身特性影响无法提高发送速率, 导致整个下行数据的数 据速率受限的问题。
图 5为本发明一实施例提供的基站的结构示意图。 如图 5所示, 本实施例 的基站包括: 第一生成模块 51、 第二生成模块 52和第一发送模块 53。
第一生成模块 51 , 用于使用 DFT-S-0FDM调制方式将第一下行数据调制 成第一下行信号。 第二生成模块 52, 用于使用 OFDM调制方式将第二下行数 据调制成第二下行信号。 第一发送模块 53, 分别与第一生成模块 51、 第二生 成模块 52和用户终端连接, 用于将第一生成模块 51调制成的第一下行信号和 第二生成模块 52调制成的第二下行信号以复用方式形成下行发射信号, 发送 给用户终端。
其中, 第一下行数据可以包括: 使用 256QAM或更高阶的数字调制方式 调制出的下行数据, 和 /或处于小区边缘的用户终端需要接收的使用数字调制 后的下行数据。 第二下行数据可以包括: 处于小区中心的用户终端需要接收 本实施例基站的各功能模块可用于执行图 1A所示下行数据发送方法的流 程, 其具体工作原理不再赘述, 详见方法实施例的描述。
本实施例的基站通过第一生成模块和第二生成模块分别使用 DFT-S-0FDM和 OFDM两种不同的调制方式对第一下行数据和第二下行数据 进行调制, 并通过第一发送模块使用复用方式完成发送, 在实现向用户终端
发送下行数据的同时, 满足不同下行数据对 EVM指标的要求, 使得用户终端 能够得到较好的解调性能, 从而使得可以提高下行数据的发送速率, 解决了 使用 OFDM发送下行数据时,部分下行数据受 OFDM本身特性影响无法提高发 送速率, 导致整个下行数据的数据速率受限的问题。
图 6为本发明另一实施例提供的基站的结构示意图。 本实施例基于图 5所 示的实施例实现, 如图 6所示,
所述第一发送模块 53, 与用户终端连接, 还用于将第一下行信号和第二 下行信号以复用方式形成下行发射信号, 发送给用户终端之前, 通过 RRC信 令, 将第一下行信号的控制信息发送给用户终端, 或者通过扩展的或修改的 PDCCH , 将第一下行信号的控制信息发送给用户终端; 所述控制信息包括第 一下行信号对应的调试方式和发送第一下行信号所用资源的资源位置。
进一步, 第一发送模块 53具体用于将同一用户终端需要接收的第一下行 信号所占用的所有 OFDM符号位置和第一下行信号所对应的调制方式通过一 个子帧发送给该用户终端。 或者, 第一发送模块 53具体用于通过一个无线帧 将同一用户终端需要接收的第一下行信号在该无线帧中所占用的 OFDM符号 位置和 /或第一下行信号所对应的调制方式发送给该用户终端; 或者, 第一发 送模块 53具体用于将同一用户终端需要接收的第一下行信号在指定个数个子 帧中所占用的 OFDM符号位置和 /或第一下行信号所对应的调制方式通过一条 RRC信令或一个经过扩展的或修改的 PDCCH发送给该用户终端。
进一步, 本实施例的基站还包括: 第三发送模块 62。 第三发送模块 62, 与第一生成模块 51连接, 用于将第一下行信号对应的解调导频信号调制到与 第一下行信号不同的 OFDM符号位置上。 其中, 解调导频信号可以是 CRS或 DMRS。
第三发送模块 62具体用于在第一下行信号被多个用户终端接收时, 将至 少一个用户终端的解调导频信号通过以下复用方式复用在至少一个 OFDM符 号位置上:
时分复用、 码分复用、 频分复用或下述复用方式的混合复用方式: 时分复用、 码分复用、 和频分复用。
进一步, 本实施例的第一发送模块 53具体用于将第一下行信号的 OFDM 符号和第二下行信号的 OFDM符号承载于同一子帧的不同 OFDM符号位置,将
至少一个所述同一子帧发送给用户终端。
第一发送模块 53还可以具体用于将第一下行信号和第二下行信号, 分别 通过不同子帧发送给用户终端。
更为具体的, 第一发送模块 53用于使用时分复用或码分复用的方式将同 一子帧中不同用户终端对应的第一下行信号复用在所对应的 OFDM符号位置 上发送给用户终端。
上述各功能模块可用于执行图 1 A或图 2A所示下行数据发送方法中的相 应流程, 其具体工作原理不再赘述, 详见方法实施例的描述。
本实施例的基站, 分别使用 DFT-S-0FDM和 OFDM两种不同的调制方式 对第一下行数据和第二下行数据进行调制, 并通过第一发送模块使用复用方 式完成发送, 在实现向用户终端发送下行数据的同时, 满足不同下行数据对 EVM指标的要求, 使得用户终端能够得到较好的解调性能, 从而使得可以提 高下行数据的发送速率, 解决了使用 OFDM发送下行数据时, 部分下行数据 受 OFDM本身特性影响无法提高发送速率, 导致整个下行数据的数据速率受 限的问题。
图 7为本发明一实施例提供的用户终端的结构示意图。 如图 7所示, 本实 施例的用户终端包括: 获取模块 71和接收模块 72。
其中, 获取模块 71 , 用于获取第一下行信号的控制信息, 所述控制信息 包括第一下行信号对应的调制方式和发送第一下行信号所用资源的资源位 置, 所述第一下行信号是基站使用 DFT-S-0FDM调制方式对第一下行数据进 行调制生成并发送的。 接收模块 72, 与获取模块 71和基站连接, 用于在获取 模块 71获取的控制信息中的资源位置所标识的资源上, 使用控制信息中的调 制方式接收基站发送的第一下行信号。
另外, 本实施例的接收模块 72还可以用于接收其他下行信号, 例如使用 OFDM调制的第二下行信号。 更为具体的举例说明, 接收模块 72还可用于接 收解调第一下行信号的解调导频信号, 例如 CRS或 DMRS。
其中, 获取模块 71具体用于接收 RRC信令, 从 RRC信令中获取第一下行 信号的控制信息; 或者具体用于接收经过扩展的或修改的 PDCCH , 从经过扩 展的或修改的 PDCCH中获取第一下行信号的控制信息。
进一步, 获取模块 71更为具体用于在一个子帧上, 从 RRC信令或经过扩
展的或修改的 PDCCH中获取该用户终端需要接收的第一下行信号所占用的 所有 OFDM符号位置和第一下行信号所对应的调制方式。 或者, 获取模块 71 更为具体的用于在每个无线帧上,从 RRC信令或经过扩展的或修改的 PDCCH 中获取该用户终端需要接收的第一下行信号在该无线帧中所占用的 OFDM符 号位置和 /或第一下行信号所对应的调制方式。 或者, 获取模块 71具体用于从 一条 RRC信令或一个经过扩展的或修改的 PDCCH中获取该用户终端需要接 收的第一下行信号在指定个数个子帧中所占用的 OFDM符号位置和 /或第一下 行信号所对应的调制方式。
本实施例用户终端的各功能模块可用于执行图 3所示下行数据接收方法 的流程, 其具体工作原理不再赘述, 详见方法实施例的描述。
本实施例提供的用户终端与本发明各实施例提供的基站相配合, 首先获 取基站使用 DFT-S-0FDM调制方式对第一下行数据进行调制生成的第一下行 信号的控制信息, 然后根据获取的控制信息在所标识的资源上使用 DFT-S-0FDM成功接收第一下行信号, 使基站可以同时使用 DFT-S-0FDM和 OFDM两种调制方式来发送下行数据, 满足不同下行数据对 EVM指标的要求, 提高了下行数据的数据速率。
本领域普通技术人员可以理解: 实现上述方法实施例的全部或部分步骤 可以通过程序指令相关的硬件来完成, 前述的程序可以存储于一计算机可读 取存储介质中, 该程序在执行时, 执行包括上述方法实施例的步骤; 而前述 的存储介质包括: R0M、 RAM, 磁碟或者光盘等各种可以存储程序代码的介
最后应说明的是: 以上实施例仅用以说明本发明的技术方案, 而非对其 限制; 尽管参照前述实施例对本发明进行了详细的说明, 本领域的普通技术 人员应当理解: 其依然可以对前述各实施例所记载的技术方案进行修改, 或 者对其中部分技术特征进行等同替换; 而这些修改或者替换, 并不使相应技 术方案的本质脱离本发明各实施例技术方案的范围。
Claims
1、 一种下行数据发送方法, 其特征在于, 包括:
使用离散傅里叶变化-扩展-正交频分复用 DFT-S-OFDM调制方式将第一下 行数据调制成第一下行信号;
使用正交频分复用 OFDM调制方式将第二下行数据调制成第二下行信号; 将所述第一下行信号和所述第二下行信号以复用方式形成下行发射信号, 发送给用户终端。
2、 根据权利要求 1所述的下行数据发送方法, 其特征在于, 所述第一下行 数据包括: 使用 256正交幅度调制 QAM或更高阶的数字调制方式调制出的下行 数据, 和 /或处于小区边缘的用户终端需要接收的进行数字调制后的下行数据; 所述第二下行数据包括: 处于小区中心的用户终端需要接收的使用低于 256 QAM的数字调制方式调制后的下行数据。
3、 根据权利要求 1所述的下行数据发送方法, 其特征在于, 所述将所述第 一下行信号和所述第二下行信号以复用方式形成下行发射信号, 发送给用户终 端, 包括:
将所述第一下行信号的 OFDM符号和所述第二下行信号的 OFDM符号承载 于同一子帧的不同 OFDM符号位置, 将至少一个所述同一子帧发送给所述用户 终端。
4、 根据权利要求 1所述的下行数据发送方法, 其特征在于, 所述将所述第 一下行信号和所述第二下行信号以复用方式形成下行发射信号, 发送给用户终 端, 包括:
将所述第一下行信号和所述第二下行信号, 分别通过不同子帧发送给所述 用户终端。
5、 根据权利要求 1或 2或 3或 4所述的下行数据发送方法, 其特征在于, 在所 述将所述第一下行信号和所述第二下行信号以复用方式形成下行发射信号, 发 送给用户终端之前, 所述方法还包括:
通过无线资源控制协议 RRC信令, 将所述第一下行信号的控制信息发送给 所述用户终端; 和 /或
通过扩展的或修改的物理下行控制信道 PDCCH , 将所述第一下行信号的控 制信息发送给所述用户终端; 所述控制信息包括所述第一下行信号对应的调制方式和发送所述第一下行 信号所用资源的资源位置。
6、 根据权利要求 5所述的下行数据发送方法, 其特征在于, 所述将所述第 一下行信号的控制信息发送给所述用户终端, 包括:
将同一用户终端需要接收的第一下行信号所占用的所有 OFDM符号位置和 所述第一下行信号所对应的调制方式通过一个子帧发送给所述用户终端; 或者 通过一个无线帧, 将同一用户终端需要接收的第一下行信号在所述无线帧 中所占用的 OFDM符号位置和 /或所述第一下行信号所对应的调制方式发送给所 述用户终端; 或者
将同一用户终端需要接收的第一下行信号在指定个数个子帧中所占用的 OFDM符号位置和 /或所述第一下行信号所对应的调制方式通过一条 RRC信令或 一个扩展的或修改的 PDCCH发送给所述用户终端。
7、 根据权利要求 1或 2或 3或 4所述的下行数据发送方法, 其特征在于, 所述 第一下行信号和所述第一下行信号对应的解调导频信号位于不同的 OFDM符号 位置上。
8、 根据权利要求 6所述的下行数据发送方法, 其特征在于, 所述方法还包 括:
当所述第一下行信号被多个用户终端接收时, 将至少一个用户终端的解调 导频信号通过以下复用方式复用在至少一个 OFDM符号位置上:
时分复用、 或码分复用、 或频分复用或下述复用方式的混合复用方式: 时分复用、 码分复用、 和频分复用。
9、 一种下行数据接收方法, 其特征在于, 包括:
获取第一下行信号的控制信息, 所述控制信息包括所述第一下行信号对应 的调制方式和发送所述第一下行信号所用资源的资源位置, 所述第一下行信号 是基站使用离散傅里叶变化-扩展-正交频分复用 DFT-S-0FDM调制方式对第一 下行数据进行调制生成的;
在所述控制信息中的资源位置所标识的资源上, 使用所述控制信息中的调 制方式接收所述基站发送的所述第一下行信号。
10、 根据权利要求 9所述的下行数据接收方法, 其特征在于, 所述获取第一 下行信号的控制信息包括: 接收无线资源控制协议 RRC信令, 从所述 RRC信令中获取所述控制信息; 或者
接收经过扩展的或修改的物理下行控制信道 PDCCH , 从所述经过扩展的或 修改的 PDCCH中获取所述控制信息。
1 1、 根据权利要求 10所述的下行数据接收方法, 其特征在于, 从所述 RRC 信令中或从所述经过修改的或扩展的 PDCCH中获取所述控制信息, 包括:
在一个子帧上,从所述 RRC信令或所述经过修改的或扩展的 PDCCH中获取 所述第一下行信号所占用的所有正交频分复用 OFDM符号位置和所述第一下行 信号所对应的调制方式; 或者
在每个无线帧上,从所述 RRC信令或所述经过修改的或扩展的 PDCCH中获 取所述第一下行信号在所述无线帧中所占用的 OFDM符号位置和 /或所述第一下 行信号所对应的调制方式; 或者
从一条所述 RRC信令或一个所述经过修改的或扩展的 PDCCH中获取所述 第一下行信号在指定个数个子帧中所占用的 OFDM符号位置和 /或所述第一下行 信号所对应的调制方式。
12、 一种基站, 其特征在于, 包括:
第一生成模块,用于使用离散傅里叶变化-扩展-正交频分复用 DFT-S-0FDM 调制方式将第一下行数据调制成第一下行信号;
第二生成模块, 用于使用正交频分复用 OFDM调制方式将第二下行数据调 制成第二下行信号;
第一发送模块, 用于将所述第一生成模块生成的第一下行信号和所述第二 生成模块生成的第二下行信号以复用方式形成下行发射信号, 发送给用户终端。
13、 根据权利要求 12所述的基站, 其特征在于, 所述第一下行数据包括: 使用 256正交幅度调制 QAM或更高阶的数字调制方式调制出的下行数据, 和 /或 处于小区边缘的用户终端需要接收的进行数字调制后的下行数据;
所述第二下行数据包括: 处于小区中心的用户终端需要接收的使用低于 256 QAM的数字调制方式调制后的下行数据。
14、 根据权利要求 12所述的基站, 其特征在于, 所述第一发送模块具体用 于将所述第一下行信号的 OFDM符号和所述第二下行信号的 OFDM符号承载于 同一子帧的不同 OFDM符号位置, 将至少一个所述同一子帧发送给所述用户终
15、 根据权利要求 12所述的基站, 其特征在于, 所述第一发送模块具体用 于将所述第一下行信号和所述第二下行信号, 分别通过不同子帧发送给所述用 户终端。
16、 根据权利要求 12或 13或 14或 15所述的基站, 其特征在于,
所述第一发送模块, 还用于在将所述第一下行信号和所述第二下行信号以 复用方式形成下行发射信号,发送给用户终端之前,通过无线资源控制协议 RRC 信令, 将所述第一下行信号的控制信息发送给所述用户终端, 或者通过扩展的 或修改的物理下行控制信道 PDCCH , 将所述第一下行信号的控制信息发送给所 述用户终端; 所述控制信息包括所述第一下行信号对应的调试方式和发送所述 第一下行信号所用资源的资源位置。
17、 根据权利要求 16所述的基站, 其特征在于,
所述第一发送模块, 具体用于将同一用户终端需要接收的第一下行信号所 占用的所有 OFDM符号位置和所述第一下行信号所对应的调制方式通过一个子 帧发送给所述用户终端; 或者具体用于通过一个无线帧, 将同一用户终端需要 接收的第一下行信号在所述无线帧中所占用的 OFDM符号位置和 /或所述第一下 行信号所对应的调制方式发送给所述用户终端; 或者具体用于将同一用户终端 需要接收的第一下行信号在指定个数个子帧中所占用的 OFDM符号位置和 /或所 述第一下行信号所对应的调制方式通过一条 RRC信令或一个扩展的或修改的 PDCCH发送给所述用户终端。
18、 根据权利要求 12或 13或 14或 15所述的基站, 其特征在于, 还包括: 第三发送模块, 用于将所述第一下行信号对应的解调导频信号调制到与所 述第一下行信号不同的 OFDM符号位置上。
19、 根据权利要求 18所述的基站, 其特征在于, 所述第三发送模块具体用 于当所述第一下行信号被多个用户终端接收时, 将至少一个用户终端的解调导 频信号通过以下复用方式复用在不同的 OFDM符号位置上:
时分复用、 码分复用、 频分复用或下述复用方式的混合复用方式: 时分复用、 码分复用、 和频分复用。
20、 一种用户终端, 其特征在于, 包括:
获取模块, 用于获取第一下行信号的控制信息, 所述控制信息包括所述第 一下行信号对应的调制方式和发送所述第一下行信号所用资源的资源位置, 所 述第一下行信号是基站使用离散傅里叶变化-扩展-正交频分复用 DFT-S-OFDM 调制方式对第一下行数据进行调制生成的;
接收模块, 用于在所述获取模块获取的控制信息中的资源位置所标识的资 源上, 使用所述控制信息中的调制方式接收所述基站发送的所述第一下行信号。
21、 根据权利要求 20所述的用户终端, 其特征在于, 所述获取模块具体用 于接收无线资源控制协议 RRC信令, 从所述 RRC信令中获取所述控制信息; 或 者具体用于接收经过扩展的或修改的物理下行控制信道 PDCCH , 从所述经过修 改的或扩展的 PDCCH中获取所述控制信息。
22、 根据权利要求 21所述的用户终端, 其特征在于, 所述获取模块具体用 于在一个子帧上,从所述 RRC信令或所述经过修改的或扩展的 PDCCH中获取所 述第一下行信号所占用的所有正交频分复用 OFDM符号位置和所述第一下行信 号所对应的调制方式; 或者具体的用于在每个无线帧上, 从所述 RRC信令或所 述经过修改的或扩展的 PDCCH中获取所述第一下行信号在所述无线帧中所占 用的 OFDM符号位置和 /或所述第一下行信号所对应的调制方式; 或者具体用于 从一条所述 RRC信令或一个所述经过修改的或扩展的 PDCCH中获取所述第一 下行信号在指定个数个子帧中所占用的 OFDM符号位置和 /或所述第一下行信号 所对应的调制方式。
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