WO2014008775A1 - 一种数据传输方法和系统 - Google Patents
一种数据传输方法和系统 Download PDFInfo
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- WO2014008775A1 WO2014008775A1 PCT/CN2013/074947 CN2013074947W WO2014008775A1 WO 2014008775 A1 WO2014008775 A1 WO 2014008775A1 CN 2013074947 W CN2013074947 W CN 2013074947W WO 2014008775 A1 WO2014008775 A1 WO 2014008775A1
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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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
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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
-
- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
-
- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
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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
-
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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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
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1423—Two-way operation using the same type of signal, i.e. duplex for simultaneous baseband signals
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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
- H04L27/2647—Arrangements specific to the receiver only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/143—Two-way operation using the same type of signal, i.e. duplex for modulated signals
Definitions
- the present invention relates to the field of wireless communication technologies, and in particular, to a data transmission method and system. Background technique
- LTE Long Term Evolution
- the distributed base station architecture uses the BBU (Base Band Unit) and the RRU (Remote Radio Unit) in the traditional macro base station. After the separation, the BBU and the RRU are generally connected by optical fibers, and define a unified CPRI (Common Public Radio Interface) standard.
- BBU Base Band Unit
- RRU Remote Radio Unit
- the BBU in the distributed base station architecture mainly performs baseband processing, and the RRU mainly performs radio frequency processing.
- the BBU performs baseband processing on the downlink channel, and the RRU performs intra-frequency radio processing.
- the baseband processing includes: channel coding 101, constellation symbol modulation 102, and multiple antenna MIMO (Multiple Input). Multiple Output, Multiple Input and Multiple Output Code 103 and OFDM (Orthogonal Frequency Division Multiplexing) symbol generation process 104.
- data is sequentially processed through the following units: Digital intermediate frequency processing unit 105 Transceiver 106, power amplifier 107 and duplexer 108.
- the RRU performs the first RF processing on the upstream channel
- the BBU performs the baseband processing.
- the data is processed through the following units in sequence: duplexer 201, low noise
- the digital intermediate frequency processing unit 105 and the digital intermediate frequency processing unit 204 perform digital intermediate frequency processing
- the transceiver 106 performs up-conversion, down-conversion, and filtering processing
- the power amplifier 107 performs power amplification processing
- the low-noise amplifier 202 performs low-noise amplification processing.
- the duplexer 108 performs duplex selection processing.
- the CPRI fixed transmission time domain data between the baseband processing and the medium radio frequency processing, once the system bandwidth and the sampling rate are determined, the CPRI bandwidth is fixed. As system bandwidth and sample rates increase, CPRI bandwidth will increase.
- an embodiment of the present invention provides a data transmission method and system for performing data transmission between a BBU and an RRU, and particularly for transmitting frequency domain data in a CPRI.
- the CPRI rate can be significantly reduced, and the communication system can dynamically adjust the CPRI bandwidth according to the usage of the load and frequency resources, thereby reducing the CPRI bandwidth.
- a data transmission method includes:
- the baseband processing unit BBU transmits the multi-antenna multi-input and multi-output MIMO encoded frequency domain data to the radio remote unit RRU through the common public radio interface CPRI;
- the RRU performs orthogonal frequency division multiplexing (OFDM) symbol generation processing on the frequency domain data received by the CPRI, so that the frequency domain data is converted into time domain data.
- OFDM orthogonal frequency division multiplexing
- a data transmission method includes:
- the radio remote unit RRU performs orthogonal frequency division multiplexing on the time domain data processed by the digital intermediate frequency, and inversely processes the OFDM symbol to convert the time domain data into frequency domain data.
- the BBU receives the frequency domain data sent by the RRU through the CPRI.
- a data transmission system comprising: a baseband processing unit BBU and a radio remote unit RRU, wherein the BBU and the RRU are connected by a common public radio interface CPRI, wherein
- the BBU further includes:
- a first sending unit configured to send, by using the CPRI, frequency domain data that is multi-antenna multi-input and multi-MIMO encoded to the RRU;
- the RRU further includes:
- a data transmission system comprising: a radio remote unit RRU and a baseband processing unit BBU, wherein the RRU and the BBU are connected by a common public radio interface CPRI, wherein
- the RRU further includes:
- An OFDM symbol generation inverse processing unit configured to perform inverse processing on orthogonal frequency division multiplexing OFDM symbols on the digital intermediate frequency processed time domain data, so that the time domain data is converted into frequency domain data; and the second sending unit is configured to: Transmitting, by the CPRI, the frequency domain data obtained by inverse processing of OFDM symbol generation to the BBU;
- the BBU further includes:
- a second receiving unit configured to receive, by using the CPRI, frequency domain data sent by the RRU.
- the transfer of the OFDM symbol generation process originally performed in the BBU to the RRU is performed such that the CPRI between the BBU and the RRU is converted from the fixed transmission time domain data to the transmission frequency domain data.
- the CPRI rate can be significantly reduced, and the communication system can dynamically adjust the CPRI bandwidth according to the usage of the load and frequency resources, thereby effectively reducing the CPRI bandwidth.
- 1 is a data transmission process diagram of a prior art data transmission method
- FIG. 2 is a data transmission process diagram of a prior art data transmission method
- FIG. 3 is a flowchart of a data transmission method according to a first embodiment of the present invention.
- FIG. 4 is a flowchart of a data transmission method according to a second embodiment of the present invention.
- FIG. 5 is a diagram showing a data transmission process of a data transmission method according to a second embodiment of the present invention.
- FIG. 6 is a flowchart of a data transmission method according to a third embodiment of the present invention.
- FIG. 7 is a flowchart of a data transmission method according to a fourth embodiment of the present invention.
- FIG. 8 is a diagram showing a data transmission process of a data transmission method according to a fourth embodiment of the present invention.
- FIG. 9 is a structural diagram of a data transmission system according to a fifth embodiment of the present invention.
- Figure 10 is a structural diagram of a data transmission system according to a sixth embodiment of the present invention.
- Embodiments of the present invention provide a data transmission method and system for performing data transmission between a BBU and an RRU, and particularly for transmitting frequency domain data in a CPRI.
- the CPRI rate can be significantly reduced, and the communication system can dynamically adjust the CPRI bandwidth according to the usage of the load and the frequency resource, thereby effectively reducing the CPRI bandwidth.
- the prior art CPRI fixed transmission time domain data and once the system bandwidth and the sampling rate are determined, the CPRI bandwidth is fixed.
- a UMTS system The carrier number is 4, the system bandwidth is 5MHz, the number of antennas is 2, and the number of sectors is 3.
- FIG. 3 For the specific process of the data transmission method in this embodiment, refer to FIG. 3, including the steps:
- the BBU sends the multi-antenna MIMO encoded frequency domain data to the RRU through the CPRI.
- the BBU does not transmit multi-antenna MIMO encoded frequency domain data to the RRU through the CPRI, and the multi-antenna MIMO encoded frequency domain data will remain in the BBU for OFDM symbol generation processing. That is, the OFDM symbol generation processing operation is performed by the BBU.
- the BBU sends the multi-antenna MIMO encoded frequency domain data to the RRU through the CPRI. That is, the OFDM symbol generation processing operation is performed by the RRU.
- the RRU receives the frequency domain data sent by the BBU by using the CPRI.
- the BBU sends the time domain data obtained after the OFDM symbol generation process to the RRU through the CPRI, that is, transmits the time domain data in the CPRI.
- the RRU receives the frequency domain data sent by the BBU through the CPRI.
- the data obtained after multi-antenna MIMO coding is still frequency domain data, that is, frequency domain data is transmitted in CPRI.
- the transmission of frequency domain data in CPRI enables the communication system to dynamically adjust the CPRI bandwidth based on the actual usage of the load or frequency resources, rather than having to allocate a fixed CPRI bandwidth when transmitting time domain data as in the prior art.
- the RRU performs OFDM symbol generation on the frequency domain data received by using the CPRI. deal with.
- the OFDM symbol generation process specifically includes: a frequency domain resource mapping process, an IFFT (Inverse Fast Fourier Transform), and a CP (Cyclic Prefix) process.
- the RRU performs OFDM symbol generation processing on the frequency domain data received through the CPRI, so that the frequency domain data transmitted through the CPRI is converted into time domain data.
- the OFDM symbol generation process originally performed in the BBU is transferred to the RRU, so that the CPRI between the BBU and the RRU is converted from the fixed transmission time domain data to the transmission frequency domain data.
- the CPRI rate can be significantly reduced, and the communication system can dynamically adjust the CPRI bandwidth according to the load and frequency resource usage, thereby effectively reducing the CPRI bandwidth.
- the second embodiment of the present invention will further explain the data transmission method according to the first embodiment.
- FIG. 4 For the specific process of the data transmission method in this embodiment, refer to FIG. 4, including the steps:
- the BBU performs channel coding on the frequency domain data.
- the BBU mainly performs baseband processing, and the baseband processing includes: channel coding, constellation symbol modulation, multi-antenna MIMO coding, and OFDM symbol generation.
- the RRU mainly performs radio frequency processing, and the radio frequency processing includes: digital intermediate frequency processing performed by the digital intermediate frequency processing unit, upconversion and filtering processing performed by the transceiver, power amplification processing performed by the power amplifier, and duplex selection processing performed by the duplexer .
- FIG. 1 includes the above baseband processing and medium radio frequency processing.
- the BBU performs channel coding on the frequency domain data.
- the data obtained by channel coding is still frequency domain data.
- the channel coding specifically includes: a CRC (Cyclic redundancy check), a block code segmentation, a coded block CRC, a code interleave, a rate match, a code block cascading, and a bit scrambling.
- CRC Cyclic redundancy check
- the operations performed in this step are the same as those in the prior art and will not be described here.
- the BBU performs constellation symbol modulation on the channel-coded frequency domain data.
- the BBU performs constellation symbol modulation on the channel-coded frequency domain data.
- the data obtained by the constellation symbol modulation is still the frequency domain data.
- the constellation symbol modulation specifically includes: a mapping process from bit to constellation. The operations performed in this step are consistent with the prior art. Let me repeat.
- the BBU performs multi-antenna MIMO encoding on the frequency domain data modulated by the constellation symbol. In this step, the BBU performs multi-antenna on the frequency domain data modulated by the constellation symbol.
- the data obtained by multi-antenna MIMO encoding is still frequency domain data.
- the multi-antenna MIMO coding specifically includes: spatial layer mapping, precoding, or beam-forming. The operations performed in this step are the same as those in the prior art, and are not described here.
- the BBU sends the multi-antenna MIMO encoded frequency domain data to the RRU through the CPRI.
- the BBU does not transmit multi-antenna MIMO encoded frequency domain data to the RRU through the CPRI, and the multi-antenna MIMO encoded frequency domain data will remain in the BBU for OFDM symbol generation processing. That is, the OFDM symbol generation processing operation is performed by the BBU.
- the BBU sends the multi-antenna MIMO encoded frequency domain data to the RRU through the CPRI. That is, the OFDM symbol generation processing operation is performed by the RRU.
- the RRU receives the frequency domain data sent by the BBU by using the CPRI.
- the BBU sends the time domain data obtained after the OFDM symbol generation process to the RRU through the CPRI, that is, transmits the time domain data in the CPRI.
- the RRU receives the frequency domain data sent by the BBU through the CPRI.
- the data obtained after multi-antenna MIMO coding is still frequency domain data, that is, frequency domain data is transmitted in CPRI.
- the transmission of frequency domain data in CPRI enables the communication system to dynamically adjust the CPRI bandwidth based on the actual usage of the load or frequency resources, rather than having to allocate a fixed CPRI bandwidth when transmitting time domain data as in the prior art.
- the RRU performs OFDM symbol generation processing on the frequency domain data received by the CPRI.
- OFDM symbol generation processing in baseband processing is performed in the BBU.
- the OFDM symbol generation process specifically includes: frequency domain resource mapping, IFFT, and CP processing.
- the RRU performs OFDM symbol generation processing on the frequency domain data received through the CPRI, so that the frequency domain data transmitted through the CPRI is converted into time domain data.
- the transfer of the OFDM symbol generation process originally performed in the BBU to the RRU is performed such that the CPRI between the BBU and the RRU is converted from the fixed transmission time domain data to the transmission frequency domain data.
- the communication system can dynamically adjust the CPRI bandwidth according to the usage of the load and frequency resources, thereby effectively reducing the CPRI bandwidth.
- the RRU sends the time domain data obtained after the OFDM symbol generation process to the digital intermediate frequency processing unit to perform digital intermediate frequency processing.
- the RRU performs digital intermediate frequency processing on the time domain data obtained after the OFDM symbol generation process.
- the data obtained by digital intermediate frequency processing is still time domain data.
- the RRU sends the digital intermediate frequency processed time domain data to the transceiver for performing upconversion and filtering processing.
- the RRU performs up-conversion and filtering on the digital intermediate-frequency processed time domain data, and the transceiver converts the time domain data from the intermediate frequency signal form to the radio frequency signal form.
- the data processed by the transceiver is still time domain data.
- the RRU sends the up-converted and filtered time domain data to the power amplifier to perform power amplification processing.
- the RRU performs power amplification processing on the time domain data subjected to up-conversion and filtering processing.
- the data obtained by the power amplification process is still time domain data and is in the form of a radio frequency signal.
- the operations performed in this step are the same as those in the prior art, and are not described here.
- the RRU sends the power-amplified time domain data to the duplexer to perform duplex selection processing.
- the RRU performs duplex selection processing on the time-domain data subjected to power amplification processing.
- the data obtained by duplex selection processing is still time domain data and is in the form of radio frequency signals.
- the RRU transmits the time domain data in the form of the radio frequency signal via an antenna.
- the data processing process diagram corresponding to the flow of the data transmission method according to the embodiment includes: BBU performing channel coding 501, constellation symbol modulation 502, and multi-antenna MIMO coding 503, and performing RRU
- Performed duplex selection processing by rotating the OFDM symbol generation process 504 originally performed in the BBU Moving to the RRU is performed such that the CPRI between the BBU and the RRU is converted from fixed transmission time domain data to transmission frequency domain data.
- the CPRI rate can be significantly reduced, and the communication system can dynamically adjust the CPRI bandwidth according to the usage of the load and frequency resources, thereby effectively reducing the CPRI bandwidth.
- an LTE system has a system bandwidth of 20 MHz, an antenna number of 4, and a sector number of 3.
- the load of different standards and different cells is generally unbalanced, and the situation that all cells are at a peak is a very small probability event.
- a CPRI load of a cell is low, its CPRI bandwidth can be Other cells are shared, enabling sharing of bandwidth between cells in different cells or in different formats (such as GSM, UMTS, and LTE for co-sites). This situation is equivalent to establishing a CPRI bandwidth pool. Therefore, the network construction does not need to allocate CPRI bandwidth according to the peak value of each cell, which saves the hardware investment of the network deployment transmission equipment.
- Steps include:
- the inverse processing of the OFDM symbol generation specifically includes: a CP processing, an FFT (Fast Fourier Transform), and a frequency domain resource mapping processing.
- Inverse processing converting the time domain data into frequency domain data.
- the RRU sends the frequency domain data obtained by the inverse processing of the OFDM symbol generation to the BBU by using the CPRI.
- the RRU does not send the frequency domain data obtained by the OFDM symbol generation inverse processing to the BBU through the CPRI, and the OFDM symbol generation inverse processing is performed in the BBU.
- the frequency domain data obtained by the inverse processing of the OFDM symbol generation will continue to remain inside the BBU for multi-antenna MIMO decoding processing.
- the RRU sends the frequency domain data obtained by the OFDM symbol generation inverse processing to the BBU through the CPRI. That is, the OFDM symbol generation inverse processing operation is performed by the RRU.
- the BBU receives the frequency domain data sent by the RRU by using the CPRI.
- the RRU transmits time domain data to the BBU through the CPRI, that is, transmits time domain data in the CPRI.
- the BBU receives the frequency domain data sent by the RRU through the CPRI.
- the data obtained by the inverse processing of the OFDM symbol generation is frequency domain data, that is, in this step, the frequency domain data is transmitted in the CPRI.
- the transmission of frequency domain data in CPRI enables the communication system to dynamically adjust the CPRI bandwidth based on the actual usage of the load or frequency resources, rather than having to allocate a fixed CPRI bandwidth when transmitting time domain data as in the prior art.
- the inverse processing of the OFDM symbol generation originally performed in the BBU is transferred to the RRU, so that the CPRI between the BBU and the RRU is converted from the fixed transmission time domain data to the transmission frequency domain data.
- the CPRI rate can be significantly reduced, and the communication system can dynamically adjust the CPRI bandwidth based on the load and frequency resource usage, thereby effectively reducing the CPRI bandwidth.
- the RRU sends the time domain data to the duplexer to perform duplex selection processing.
- the RRU performs duplex selection processing on the time domain data.
- the data obtained through duplex selection processing is still time domain data.
- the operations performed in this step are the same as those in the prior art, and are not described here.
- the RRU sends the time domain data processed by the duplex selection process to the low noise amplifier to perform low noise amplification processing.
- the RRU performs low noise amplification processing on the time domain data subjected to duplex selection processing.
- the data obtained by the low noise amplification process is still time domain data.
- the operations performed in this step are the same as those in the prior art, and are not described here.
- the RRU sends the low-noise amplification processed time domain data to the transceiver to perform Down conversion and filtering processing.
- the RRU performs down-conversion and filtering on the time-domain data subjected to low-noise amplification processing, and the transceiver converts the time domain data from the radio frequency signal form to the intermediate frequency signal form.
- the data processed by the transceiver is still time domain data.
- the RRU sends the down-converted and filtered-processed time domain data to the digital intermediate frequency processing unit to perform digital intermediate frequency processing.
- the RRU performs digital intermediate frequency processing on the time domain data obtained by down-converting and filtering.
- the data obtained by digital intermediate frequency processing is still time domain data.
- the inverse processing of OFDM symbol generation in baseband processing is performed in the BBU.
- the inverse processing of the OFDM symbol generation specifically includes: a CP processing, an FFT, and a frequency domain resource mapping processing. Inverse processing, converting the time domain data into frequency domain data.
- the RRU sends the frequency domain data obtained by inverse processing of the OFDM symbol to the BBU through the CPRI.
- the RRU does not send the frequency domain data obtained by the inverse processing of the OFDM symbol generation to the BBU through the CPRI, and the OFDM symbol generation inverse processing is performed in the BBU, and the inverse processing is performed by the OFDM symbol generation.
- the frequency domain data will remain in the BBU for multi-antenna MIMO decoding processing.
- the RRU sends the frequency domain data obtained by the OFDM symbol generation inverse processing to the BBU through the CPRI. That is, the OFDM symbol generation inverse processing operation is performed by the RRU.
- the BBU receives the frequency domain data sent by the RRU by using the CPRI.
- the RRU transmits time domain data to the BBU through the CPRI, that is, transmits time domain data in the CPRI.
- the BBU receives the frequency domain data sent by the RRU through the CPRI.
- the data obtained by inverse processing of the OFDM symbol generation is frequency domain data, that is, in this step, the frequency domain data is transmitted in the CPRI.
- the transmission of frequency domain data in CPRI enables the communication system to dynamically adjust the CPRI bandwidth based on the actual usage of the load or frequency resources, rather than having to allocate a fixed CPRI bandwidth when transmitting time domain data as in the prior art.
- the BBU performs multi-antenna MIMO decoding on the frequency domain data sent by the RRU.
- the BBU performs multi-antenna MIMO decoding on the frequency domain data sent by the RRU.
- the data obtained by multi-antenna MIMO encoding is still frequency domain data.
- the multi-antenna MIMO decoding specifically includes: channel equalization and multi-antenna signal combining processing. The operations performed in this step are the same as those in the prior art, and are not described here.
- the BBU performs constellation symbol demodulation on the multi-antenna MIMO decoded frequency domain data.
- the BBU performs symmetry symbol demodulation on the multi-antenna MIMO decoded frequency domain data.
- the data obtained by demodulating the constellation symbols is still frequency domain data.
- the constellation symbol demodulation specifically includes: calculation of constellation symbols to bit soft information. The operations performed in this step are the same as those in the prior art, and are not described here.
- the BBU performs channel decoding on the frequency domain data demodulated by the constellation symbol.
- the BBU performs channel decoding on the frequency domain data demodulated by the constellation symbol.
- the data obtained by channel decoding is still frequency domain data.
- the channel decoding specifically includes: bit descrambling, de-rate matching, decoding de-interleaving, code block CRC check, de-segmentation, and fast CRC check. The operations performed in this step are the same as those in the prior art, and are not described here.
- the data transmission process diagram corresponding to the flow of the data transmission method according to the embodiment includes: duplex selection processing specifically performed by the duplexer 801 in the RRU, specifically by low noise.
- the constellation symbol demodulation 807 and the channel decoding 808 are performed by transferring the OFDM symbol generation inverse processing 805 originally performed in the BBU to the RRU, so that the CPRI between the BBU and the RRU is converted from the fixed transmission time domain data to Transmit frequency domain data.
- the CPRI rate can be significantly reduced, and the communication system can dynamically adjust the CPRI bandwidth according to the usage of the load and frequency resources, thereby effectively reducing the CPRI band. width.
- a fifth embodiment of the present invention will be described in detail with respect to a data transmission system.
- the system of the present embodiment includes one or more units for implementing one or more steps of the foregoing method.
- the description of the various steps in the foregoing methods applies to the corresponding elements in the system.
- Figure 9 For the specific structure of the data transmission system described in this embodiment, refer to Figure 9, including:
- the baseband processing unit BBU90 and the radio remote unit RRU90, BBU90 and RRU91 are connected by a common public radio interface CPRI, wherein
- BBU90 further includes:
- the channel coding unit 901 is configured to perform channel coding on the frequency domain data.
- the channel coding unit 901 performs channel coding on the frequency domain data.
- the data obtained by channel coding is still frequency domain data.
- the channel coding specifically includes: adding a transport block CRC, a block code segment, a coded block CRC, a code interleave, a rate match, a code block cascading, and a bit scrambling.
- the operation performed by the channel coding unit 901 is the same as that of the second embodiment, and will not be described again.
- the constellation symbol modulation unit 902 is communicatively coupled to the channel coding unit 901 for performing constellation symbol modulation on the channel-coded frequency domain data.
- a constellation symbol modulation unit 902 performs constellation symbol modulation on the channel-coded frequency domain data.
- the data obtained by the constellation symbol modulation is still the frequency domain data.
- the constellation symbol modulation specifically includes: a mapping process from bit to constellation.
- the operation performed by the constellation symbol modulation unit 902 is the same as that of the second embodiment, and will not be described again.
- the multi-antenna MIMO coding unit 903 is communicatively coupled to the constellation symbol modulation unit 902 for performing multi-antenna MIMO coding on the constellation symbol-modulated frequency domain data.
- the multi-antenna MIMO encoding unit 903 performs multi-antenna MIMO encoding on the constellation-symbol-modulated frequency domain data.
- the data obtained by multi-antenna MIMO encoding is still frequency domain data.
- the multi-antenna MIMO coding specifically includes: spatial layer mapping, precoding, or beam-forming.
- the operation performed by the multi-antenna MIMO encoding unit 903 is the same as that of the second embodiment step 403, and will not be described again here.
- the first sending unit 904 is communicably connected to the multi-antenna MIMO encoding unit 903, and is configured to send, by using the CPRI, the multi-antenna multi-input and multi-output MIMO encoded frequency domain data to the RRU.
- the BBU does not transmit to the RRU through the CPRI through the multi-antenna MIMO coding.
- the frequency domain data of the code, the multi-antenna MIMO encoded frequency domain data will remain in the BBU for OFDM symbol generation processing. That is, the OFDM symbol generation processing operation is performed by the BBU.
- the first transmitting unit 904 transmits the multi-antenna MIMO encoded frequency domain data to the RRU 91 through the CPRI. That is, the OFDM symbol generation processing operation is performed by the RRU 91.
- the RRU 91 further includes:
- the first receiving unit 911 is configured to receive, by using the CPRI, frequency domain data sent by the BBU.
- the BBU sends the time domain data obtained after the OFDM symbol generation process to the RRU through the CPRI, that is, transmits the time domain data in the CPRI.
- the first receiving unit 911 receives the frequency domain data sent by the BBU 90 through the CPRI.
- the data obtained after multi-antenna MIMO encoding is still frequency domain data, that is, the frequency domain data is transmitted in CPRI.
- the transmission of frequency domain data in CPRI enables the communication system to dynamically adjust the CPRI bandwidth based on the actual usage of the load or frequency resources, rather than having to allocate a fixed CPRI bandwidth when transmitting time domain data as in the prior art.
- the OFDM symbol generating unit 912 is communicably connected to the first receiving unit 911, and configured to perform orthogonal frequency division multiplexing OFDM symbol generation processing on the frequency domain data received by the CPRI, so that the frequency domain data is converted into time. Domain data.
- OFDM symbol generation processing in baseband processing is performed in the BBU.
- the OFDM symbol generation process specifically includes: frequency domain resource mapping, IFFT, and CP processing.
- the frequency domain data is subjected to OFDM symbol generation processing to convert the frequency domain data transmitted through the CPRI into time domain data.
- the transfer of the OFDM symbol generation process originally performed in the BBU to the RRU is performed such that the CPRI between the BBU and the RRU is converted from the fixed transmission time domain data to the transmission frequency domain data. This enables the communication system to dynamically adjust the CPRI bandwidth based on load and frequency resource usage, thereby effectively reducing CPRI bandwidth.
- the first digital intermediate frequency processing unit 913 is communicatively coupled to the OFDM symbol generating unit 912, and configured to receive the time domain data obtained after the OFDM symbol generation process, and perform digital intermediate frequency processing.
- the first digital intermediate frequency processing unit 913 performs digital intermediate frequency processing on the time domain data obtained after the OFDM symbol generation processing.
- the data obtained by digital intermediate frequency processing is still time domain data.
- the operation performed by the first digital intermediate frequency processing unit 913 is the same as that of the second embodiment step 407, and details are not described herein again.
- the first transceiver 914 is in communication with the first digital intermediate frequency processing unit 913 for receiving the digital intermediate frequency processed time domain data, and performing up-conversion and filtering processing.
- the first transceiver 914 upconverts and filters the digital intermediate frequency processed time domain data, and the first transceiver 914 converts the time domain data from the intermediate frequency signal form to the radio frequency signal form.
- the data processed by the first transceiver 914 is still time domain data.
- the operations performed by the first transceiver 914 are the same as those of the second embodiment, and will not be described again.
- the power amplifier 915 is communicatively coupled to the first transceiver 914 for receiving the time-varying data subjected to the up-conversion and filtering processing and performing power amplification processing.
- the power amplifier 915 performs power amplification processing on the up-converted and filtered time domain data.
- the data obtained by the power amplification process is still time domain data and is in the form of a radio frequency signal.
- the operation performed by the power amplifier 915 is the same as that of the second embodiment, and will not be described again.
- the first duplexer 916 is communicatively coupled to the power amplifier 915 for receiving the time domain data subjected to power amplification processing and performing duplex selection processing.
- the first duplexer 916 performs duplex selection processing on the time-amplified data subjected to power amplification processing.
- the data obtained by duplex selection processing is still time domain data and is in the form of radio frequency signals.
- the RRU transmits the time domain data in the form of the radio frequency signal via an antenna.
- the CPRI between the BBU 90 and the RRU 91 is converted from the fixed transmission time domain data to the transmission frequency domain data by transferring the OFDM symbol generating unit 912 originally in the BBU 90 to the RRU 91.
- the CPRI rate can be significantly reduced, and the communication system can dynamically adjust the CPRI bandwidth according to the usage of the load and frequency resources, thereby effectively reducing the CPRI bandwidth.
- a sixth embodiment of the present invention will be described in detail with respect to a data communication system.
- the system described in this embodiment includes one or more units for implementing one or more steps of the foregoing method.
- the description of the various steps in the foregoing methods applies to the corresponding elements in the system.
- FIG. 10 For the specific structure of the data transmission system described in this embodiment, refer to FIG. 10, including:
- Radio remote unit RRU100 and baseband processing unit BBU101, said RRU100 and The BBU 101 is connected through a common public wireless interface CPRI, where
- the RRU 100 further includes:
- the second duplexer 1001 is configured to receive the time domain data for duplex selection processing.
- the operation performed by the second duplexer 1001 and the operation performed by the first duplexer 916 in the fifth embodiment are mutually reversed. Please refer to the related description of the step 701 of the fourth embodiment, and details are not described herein again.
- the low noise amplifier 1002 is communicatively coupled to the second duplexer 1001 for receiving the time domain data subjected to the duplex selection process for low noise amplification processing.
- the operation performed by the low-noise amplifier 1002 and the operation performed by the power amplifier 915 in the fifth embodiment are mutually reversed. Please refer to the related description of the step 702 of the fourth embodiment, and details are not described herein again.
- the second transceiver 1003 is communicatively coupled to the low noise amplifier 1002 for receiving the time domain data subjected to the low noise amplification processing for down conversion and filtering processing.
- the operation performed by the second transceiver 1003 and the operation performed by the first transceiver 914 in the fifth embodiment are mutually reversed. Please refer to the related description of step 703 in the fourth embodiment, and details are not described herein again.
- the second digital intermediate frequency processing unit 1004 is communicatively coupled to the second transceiver 1003 for receiving the down-converted and filtered processed time domain data for digital intermediate frequency processing.
- the operation performed by the second digital intermediate frequency processing unit 1004 and the operation performed by the first digital intermediate frequency processing unit 913 in the fifth embodiment are mutually reversed. Please refer to the related description of step 704 in the fourth embodiment, and details are not described herein again. .
- the OFDM symbol generation inverse processing unit 1005 is communicatively coupled to the second digital intermediate frequency processing unit 1004, and configured to perform inverse frequency division multiplexing OFDM symbol generation inverse processing on the digital intermediate frequency processed time domain data, so that the time domain data conversion is performed. For frequency domain data.
- the operation performed by the OFDM symbol generation inverse processing unit 1005 and the operation performed by the OFDM symbol generation unit 912 in the fifth embodiment are mutually reversed. Please refer to the related description of the step 705 of the fourth embodiment, and details are not described herein again.
- the second transmitting unit 1006 is in communication with the OFDM symbol generation inverse processing unit 1005, and is configured to send, by using the CPRI, the frequency domain data obtained by the OFDM symbol generation inverse processing to the BBU.
- the BBU 101 further includes:
- the second receiving unit 1011 is configured to receive, by using the CPRI, frequency domain data sent by the RRU.
- the multi-antenna MIMO decoding unit 1012 is communicatively coupled to the second receiving unit 1011 for pairing The frequency domain data transmitted by the RRU performs multi-antenna MIMO decoding.
- the operation performed by the multi-antenna MIMO coding unit 1012 and the operation performed by the multi-antenna MIMO coding unit 903 in the fifth embodiment are mutually reversed. Please refer to the related description of the step 708 in the fourth embodiment, and details are not described herein again.
- the constellation symbol demodulation unit 1013 is communicatively coupled to the multi-antenna MIMO decoding unit 1012 for performing constellation symbol demodulation on the multi-antenna MIMO decoded frequency domain data.
- the operation performed by the constellation symbol demodulation unit 1013 is inversely related to the operation performed by the constellation symbol modulation unit 902 in the fifth embodiment. Please refer to the related description of the step 709 in the fourth embodiment, and details are not described herein again.
- the channel decoding unit 1014 is communicatively coupled to the constellation symbol demodulation unit 1013 for channel decoding the frequency domain data demodulated by the constellation symbols.
- the operations performed by the channel decoding unit 1014 and the operations performed by the channel coding unit 901 in the fifth embodiment are mutually reversed. Please refer to the related description of the step 710 in the fourth embodiment, and details are not described herein again.
- the CPRI between the BBU 101 and the RRU 100 is converted from the fixed transmission time domain data to the transmission frequency domain data by transferring the OFDM symbol generation inverse processing unit 1005 originally in the BBU 101 to the RRU 100.
- the CPRI rate can be significantly reduced, and the communication system can dynamically adjust the CPRI bandwidth based on the load and frequency resource usage, thereby effectively reducing the CPRI bandwidth.
- the medium can be a read only memory, a magnetic disk or a compact disk or the like.
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Abstract
本发明实施例公开了一种数据传输方法和系统,用于在BBU和RRU之间进行数据传输,尤其是在CPRI中传输频域数据。本发明实施例方法包括:基带处理单元BBU通过通用公共无线接口CPRI向射频拉远单元RRU发送经过多天线多进多出MIMO编码的频域数据;所述RRU通过所述CPRI接收所述BBU发送的频域数据;所述RRU对所述通过所述CPRI接收的频域数据进行正交频分复用OFDM符号生成处理,使得所述频域数据转换为时域数据。通过实施例发明方案,可以显著降低CPRI速率,而且能够使得通信系统根据负载和频率资源的使用情况动态调整CPRI带宽,从而降低CPRI带宽。
Description
一种数据传输方法和系统 本申请要求于 2 01 2年 7月 1 1 日 提交中 国 专利局 、 申请号为 2 01 21 02 39 1 52. 8 、 发明名称为 "一种数据传输方法和系统" 的中国专利 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
本发明涉及无线通信技术领域, 尤其涉及一种数据传输方法和系统。 背景技术
LTE ( Long Term Evolution , 长期演进计划) 网络大量使用分布式基站架 构,分布式基站架构把传统宏基站中的 BBU ( Base Band Unit,基带处理单元 ) 和 RRU ( Remote Radio Unit, 射频拉远单元 )分离开来, BBU和 RRU之间 一般釆用光纤进行连接,并定义统一的 CPRI ( Common Public Radio Interface, 公共开放无线接口 )标准。
当前,分布式基站架构中的 BBU主要进行基带处理, RRU主要进行中射 频处理。 请参见图 1所示的数据传输过程, 在下行通道上 BBU先进行基带处 理, RRU再进行中射频处理, 其中, 基带处理依次包括: 信道编码 101、 星 座符号调制 102、 多天线 MIMO ( Multiple Input Multiple Output, 多进多出) 编码 103和 OFDM ( Orthogonal Frequency Division Multiplexing, 正交频分复 用)符号生成处理 104, 中射频处理过程中, 数据依次经过以下单元进行数据 处理: 数字中频处理单元 105、 收发信机 106、 功率放大器 107和双工器 108。 请参见图 2所示的数据传输过程,在上行通道上 RRU先进行中射频处理, BBU 再进行基带处理, 中射频处理过程中, 数据依次经过以下单元进行数据处理: 双工器 201、 低噪声放大器 202、 收发信机 203和数字中频处理单元 204, 基 带处理依次包括: OFDM符号生成逆处理 205、 多天线 MIMO译码 206、 星 座符号解调 207和信道译码 208。 其中, 数字中频处理单元 105和数字中频处 理单元 204进行数字中频处理, 收发信机 106进行上变频、 下变频和滤波处 理, 功率放大器 107进行功率放大处理, 低噪声放大器 202进行低噪声放大 处理, 双工器 108进行双工选择处理。
但是,上述数据传输过程中基带处理与中射频处理之间的 CPRI固定传输 时域数据, 一旦系统带宽和釆样速率确定, CPRI带宽也就固定下来。 随着系 统带宽和釆样速率日益增长, CPRI带宽也会随之增长。
发明内容
为了解决上述问题, 本发明实施例提供了一种数据传输方法和系统, 用 于在 BBU和 RRU之间进行数据传输, 尤其是在 CPRI中传输频域数据。通过 实施本实施例, 可以显著降低 CPRI速率, 而且能够使得通信系统根据负载和 频率资源的使用情况动态调整 CPRI带宽, 从而降低 CPRI带宽。
一种数据传输方法, 包括:
基带处理单元 BBU通过通用公共无线接口 CPRI向射频拉远单元 RRU发 送经过多天线多进多出 MIMO编码的频域数据;
所述 RRU通过所述 CPRI接收所述 BBU发送的频域数据;
所述 RRU对所述通过所述 CPRI接收的频域数据进行正交频分复用 OFDM符号生成处理, 使得所述频域数据转换为时域数据。
一种数据传输方法, 包括:
射频拉远单元 RRU对经过数字中频处理的时域数据进行正交频分复用 OFDM符号生成逆处理, 使得所述时域数据转换为频域数据;
所述 RRU通过通用公共无线接口 CPRI向基带处理单元 BBU发送所述经 过 OFDM符号生成逆处理所得到的频域数据;
所述 BBU通过所述 CPRI接收所述 RRU发送的频域数据。
一种数据传输系统, 包括: 基带处理单元 BBU和射频拉远单元 RRU, 所 述 BBU和 RRU通过通用公共无线接口 CPRI连接 , 其中,
所述 BBU进一步包括:
第一发送单元, 用于通过所述 CPRI向所述 RRU发送经过多天线多进多 出 MIMO编码的频域数据;
所述 RRU进一步包括:
第一接收单元, 用于通过所述 CPRI接收所述 BBU发送的频域数据; OFDM符号生成单元,用于对所述通过所述 CPRI接收的频域数据进行正 交频分复用 OFDM符号生成处理, 使得所述频域数据转换为时域数据。
一种数据传输系统, 包括: 射频拉远单元 RRU和基带处理单元 BBU, 所 述 RRU和 BBU通过通用公共无线接口 CPRI连接 , 其中,
所述 RRU进一步包括:
OFDM符号生成逆处理单元, 用于对经过数字中频处理的时域数据进行 正交频分复用 OFDM符号生成逆处理, 使得所述时域数据转换为频域数据; 第二发送单元,用于通过所述 CPRI向所述 BBU发送所述经过 OFDM符 号生成逆处理所得到的频域数据;
所述 BBU进一步包括:
第二接收单元, 用于通过所述 CPRI接收所述 RRU发送的频域数据。 从以上技术方案可以看出, 本发明实施例具有以下优点:
通过将原来在 BBU中进行的 OFDM符号生成处理转移到 RRU中进行, 使得在 BBU和 RRU之间的 CPRI由固定传输时域数据转换为传输频域数据。 可以显著降低 CPRI速率,而且使得通信系统能够根据负载和频率资源的使用 情况动态调整 CPRI带宽, 从而有效降低 CPRI带宽。
附图说明
图 1为现有技术数据传输方法的数据传输过程图;
图 2为现有技术数据传输方法的数据传输过程图;
图 3为本发明第一实施的数据传输方法流程图;
图 4为本发明第二实施的数据传输方法流程图;
图 5为本发明第二实施数据传输方法的数据传输过程图;
图 6为本发明第三实施的数据传输方法流程图;
图 7为本发明第四实施的数据传输方法流程图;
图 8为本发明第四实施数据传输方法的数据传输过程图;
图 9为本发明第五实施的数据传输系统结构图;
图 10为本发明第六实施的数据传输系统结构图。
具体实施方式
下面将结合本发明中的说明书附图, 对发明中的技术方案进行清楚、 完 整地描述, 显然, 所描述的实施例仅仅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做出创造性
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。 本发明实施例提供了一种数据传输方法和系统, 用于在 BBU和 RRU之 间进行数据传输, 尤其是在 CPRI中传输频域数据。 通过实施本实施例, 可以 显著降低 CPRI速率 ,而且能够使得通信系统根据负载和频率资源的使用情况 动态调整 CPRI带宽, 从而有效降低 CPRI带宽。
现有技术的 CPRI 固定传输时域数据, 一旦系统带宽和釆样速率确定, CPRI带宽也就固定下来。 例如, 一个 LET系统, 其系统带宽为 20MHz, 天 线数为 4 , 扇区数为 3 , 该系统的 CPRI 带宽要求为 30.72M x 16bit x 2IQ x 4channel x 3sector=11.8Gbps„ 再如, 一个 UMTS 系统, 其载波数为 4, 系统 带宽为 5MHz,天线数为 2,扇区数为 3 ,该系统的 CPRI带宽要求为 4 3.84Μ 16bit 2IQ 2channel 3sector=3.0Gbps。如果上述 LTE系统和 UMTS系统 共站点, 则该站点的 CPRI带宽需求约为 15Gbps。
本发明第一实施例将对一种数据传输方法进行详细说明, 本实施例所述 数据传输方法具体流程请参见图 3 , 包括步骤:
301、 BBU通过 CPRI向 RRU发送经过多天线 MIMO编码的频域数据。 在现有技术中, BBU不会通过 CPRI向 RRU发送经过多天线 MIMO编 码的频域数据,所述经过多天线 MIMO编码的频域数据会继续留在 BBU内部 进行 OFDM符号生成处理。 即 OFDM符号生成处理操作由 BBU执行。
在本步骤中, BBU通过 CPRI向 RRU发送经过多天线 MIMO编码的频 域数据。 即 OFDM符号生成处理操作转由 RRU执行。
302、 RRU通过所述 CPRI接收所述 BBU发送的频域数据。
在现有技术中, BBU通过 CPRI向 RRU发送经过 OFDM符号生成处理 后得到的时域数据, 即在 CPRI中传输时域数据。
在本步骤中, RRU通过所述 CPRI接收所述 BBU发送的频域数据。 经过 多天线 MIMO编码后得到的数据仍为频域数据, 即在 CPRI中传输频域数据。
在 CPRI 中传输频域数据使得通信系统能够根据负载或者频率资源的实 际使用情况动态调整 CPRI带宽,而不用像现有技术中传输时域数据时必须分 配固定的 CPRI带宽。
303、 RRU对所述通过所述 CPRI接收的频域数据进行 OFDM符号生成
处理。
在现有技术中, 基带处理中的 OFDM符号生成处理在 BBU中执行。 其 中, OFDM符号生成处理具体包括: 频域资源映射处理、 IFFT ( Inverse Fast Fourier Transform, 快速傅立叶反变换)和加 CP ( Cyclic Prefix, 循环前缀) 处理。
在本步骤中, RRU对所述通过所述 CPRI接收的频域数据进行 OFDM符 号生成处理, 使得所述通过 CPRI传输的频域数据转换为时域数据。
在本实施例中, 通过将原来在 BBU中进行的 OFDM符号生成处理转移 到 RRU中进行, 使得在 BBU和 RRU之间的 CPRI由固定传输时域数据转换 为传输频域数据。 可以显著降低 CPRI速率, 而且使得通信系统能够根据负载 和频率资源的使用情况动态调整 CPRI带宽, 从而有效降低 CPRI带宽。
本发明第二实施例将对第一实施例所述的数据传输方法进行补充说明, 本实施例所述的数据传输方法具体流程请参见图 4, 包括步骤:
401、 BBU对频域数据进行信道编码。
在现有技术中, BBU主要进行基带处理, 基带处理包括: 信道编码、 星 座符号调制、 多天线 MIMO编码和 OFDM符号生成。 RRU主要进行中射频 处理, 中射频处理包括: 数字中频处理单元执行的数字中频处理、 收发信机 执行的上变频和滤波处理、 功率放大器执行的功率放大处理和双工器执行的 双工选择处理。 本发明实施例的通信系统进行数据传输的过程请参见图 1 , 包 括上述基带处理和中射频处理。
在本步骤中, BBU对频域数据进行信道编码。 经过信道编码得到的数据 仍为频域数据。 其中, 信道编码具体包括: 加传输块 CRC ( Cyclic redundancy check, 循环冗余校验码) 、 块码分段、 加码块 CRC、 编码交织、 速率匹配、 码块级联和比特加扰。 本步骤所执行的操作与现有技术中一致, 这里不再赘 述。
402、 BBU对所述经过信道编码的频域数据进行星座符号调制。
在本步骤中, BBU对所述经过信道编码的频域数据进行星座符号调制。 经过星座符号调制得到的数据仍为频域数据。 其中, 星座符号调制具体包括: 比特到星座图的映射处理。 本步骤所执行的操作与现有技术中一致, 这里不
再赘述。
403、 BBU对所述经过星座符号调制的频域数据进行多天线 MIMO编码。 在本步骤中, BBU 对所述经过星座符号调制的频域数据进行多天线
MIMO编码。 经过多天线 MIMO编码得到的数据仍为频域数据。 其中, 多天 线 MIMO编码具体包括: 空间层的映射、 预编码或者 Beam-forming (波束形 成) 。 本步骤所执行的操作与现有技术中一致, 这里不再赘述。
404、 BBU通过 CPRI向 RRU发送经过所述多天线 MIMO编码的频域数 据。
在现有技术中, BBU不会通过 CPRI向 RRU发送经过多天线 MIMO编 码的频域数据,所述经过多天线 MIMO编码的频域数据会继续留在 BBU内部 进行 OFDM符号生成处理。 即 OFDM符号生成处理操作由 BBU执行。
在本步骤中, BBU通过 CPRI向 RRU发送经过多天线 MIMO编码的频 域数据。 即 OFDM符号生成处理操作转由 RRU执行。
405、 RRU通过所述 CPRI接收所述 BBU发送的频域数据。
在现有技术中, BBU通过 CPRI向 RRU发送经过 OFDM符号生成处理 后得到的时域数据, 即在 CPRI中传输时域数据。
在本步骤中, RRU通过所述 CPRI接收所述 BBU发送的频域数据。 经过 多天线 MIMO编码后得到的数据仍为频域数据, 即在 CPRI中传输频域数据。
在 CPRI 中传输频域数据使得通信系统能够根据负载或者频率资源的实 际使用情况动态调整 CPRI带宽,而不用像现有技术中传输时域数据时必须分 配固定的 CPRI带宽。
406、 RRU对所述通过所述 CPRI接收的频域数据进行 OFDM符号生成 处理。
在现有技术中, 基带处理中的 OFDM符号生成处理在 BBU中执行。 其 中, OFDM符号生成处理具体包括: 频域资源映射、 IFFT和加 CP处理。
在本步骤中, RRU对所述通过所述 CPRI接收的频域数据进行 OFDM符 号生成处理, 使得所述通过 CPRI传输的频域数据转换为时域数据。
通过将原来在 BBU中进行的 OFDM符号生成处理转移到 RRU中进行, 使得在 BBU和 RRU之间的 CPRI由固定传输时域数据转换为传输频域数据。
使得通信系统能够根据负载和频率资源的使用情况动态调整 CPRI带宽,从而 有效降低 CPRI带宽。
407、 RRU向数字中频处理单元发送所述经过 OFDM符号生成处理后得 到的时域数据, 以进行数字中频处理。
在本步骤中, RRU对所述经过 OFDM符号生成处理后得到的时域数据进 行数字中频处理。 经过数字中频处理得到的数据仍为时域数据。 本步骤所执 行的操作与现有技术中一致, 这里不再赘述。
408、 RRU向收发信机发送所述经过数字中频处理的时域数据, 以进行上 变频和滤波处理。
在本步骤中, RRU对所述经过数字中频处理的时域数据进行上变频和滤 波处理, 收发信机会将时域数据由中频信号形式转换为射频信号形式。 经过 收发信机处理得到的数据仍为时域数据。 本步骤所执行的操作与现有技术中 一致, 这里不再赘述。
409、 RRU向功率放大器发送所述经过上变频和滤波处理的时域数据, 以 进行功率放大处理。
在本步骤中, RRU对所述经过上变频和滤波处理的时域数据进行功率放 大处理。 经过功率放大处理得到的数据仍为时域数据, 且为射频信号形式。 本步骤所执行的操作与现有技术中一致, 这里不再赘述。
410、 RRU向双工器发送所述经过功率放大处理的时域数据, 以进行双工 选择处理。
在本步骤中, RRU对所述经过功率放大处理的时域数据进行双工选择处 理。 经过双工选择处理得到的数据仍为时域数据, 且为射频信号形式。 最后 RRU经由天线把所述射频信号形式的时域数据发送出去。
在本实施例中, 如图 5 所示, 为本实施例所述数据传输方法流程对应的 数据处理过程图, 包括: BBU执行信道编码 501、 星座符号调制 502和多天 线 MIMO编码 503 , RRU执行 OFDM符号生成处理 504 , 具体由数字中频处 理单元 505执行的数字中频处理、 具体由收发信机 506执行的上变频和滤波 处理、 具体由功率放大器 507执行的功率放大处理和具体由双工器 508执行 的双工选择处理, 通过将原来在 BBU中进行的 OFDM符号生成处理 504转
移到 RRU中进行, 使得在 BBU和 RRU之间的 CPRI由固定传输时域数据转 换为传输频域数据。 可以显著降低 CPRI速率, 而且使得通信系统能够根据负 载和频率资源的使用情况动态调整 CPRI带宽, 从而有效降低 CPRI带宽。 例 如, 一个 LTE系统, 其系统带宽为 20MHz, 天线数为 4, 扇区数为 3 , 按照 现有技术的方案, 该系统的 CPRI带宽要求为 30.72M 16bit 2IQ 4channel x 3sector=11.8Gbps, 假设该系统的最大使用子载波数为 1200, 则按照本发明 方案, 该系统的 CPRI 带宽要求为 1200subcarrier 14symbol x 16bit χ 2IQ 4channel χ 3 sector/1 ms=6.5Gbps„ 在 100 %峰值负载及频率资源使用情况下, 本发明方案 CPRI带宽为现有技术的 6.5Gbps/11.8Gbps=55 % ; 在 70 %平均资 源使用情况下, 本发明方案 CPRI带宽为现有技术的 38 % ; 在 50 %平均资源 使用情况下, 本发明方案 CPRI带宽为现有技术的 27 %。
在一个网络中, 不同制式、 不同小区的负载一般是不平衡的, 而且所有 小区都处于峰值的情况是极小概率的事件, 当一个小区的 CPRI负载较低的时 候, 它的 CPRI带宽可以被其它小区共享, 实现在不同小区或者不同制式(比 如共站点的 GSM、 UMTS和 LTE )小区之间共享带宽。 这种情况相当于建立 一个 CPRI带宽池。因此网络建设的时候不需要给每个小区都按照峰值来分配 CPRI带宽, 节省了网络部署传输设备的硬件性投入。
本发明第三实施例将对一种数据传输方法进行详细说明, 本实施例所述 数据传输方法具体流程请参见图 6, 包括步骤: 在现有技术中, 基带处理中的 OFDM符号生成逆处理在 BBU中执行。 其中, OFDM符号生成逆处理具体包括: 去 CP 处理、 FFT ( Fast Fourier Transform, 快速傅立叶变换)和解频域资源映射处理。 逆处理, 使得所述时域数据转换为频域数据。
602、 RRU通过 CPRI向 BBU发送所述经过 OFDM符号生成逆处理所得 到的频域数据。
在现有技术中, RRU不会通过 CPRI向 BBU发送所述经过 OFDM符号 生成逆处理所得到的频域数据, 所述 OFDM符号生成逆处理在 BBU中执行,
经过所述 OFDM符号生成逆处理得到的频域数据会继续留在 BBU内部进行 多天线 MIMO译码处理。
在本步骤中, RRU通过 CPRI向 BBU发送所述经过 OFDM符号生成逆 处理所得到的频域数据。 即 OFDM符号生成逆处理操作转由 RRU执行。
603、 BBU通过所述 CPRI接收所述 RRU发送的频域数据。
在现有技术中 , RRU通过 CPRI向 BBU发送时域数据, 即在 CPRI中传 输时域数据。
在本步骤中, BBU通过所述 CPRI接收所述 RRU发送的频域数据。 经过 OFDM符号生成逆处理得到的数据为频域数据, 即在本步骤中, CPRI中传输 频域数据。
在 CPRI 中传输频域数据使得通信系统能够根据负载或者频率资源的实 际使用情况动态调整 CPRI带宽,而不用像现有技术中传输时域数据时必须分 配固定的 CPRI带宽。
在本实施例中, 通过将原来在 BBU中进行的 OFDM符号生成逆处理转 移到 RRU中进行, 使得在 BBU和 RRU之间的 CPRI由固定传输时域数据转 换为传输频域数据。 可以显著降低 CPRI速率, 而且使得通信系统能够根据负 载和频率资源的使用情况动态调整 CPRI带宽, 从而有效降低 CPRI带宽。
本发明第四实施例将对第三实施例所述的数据传输方法进行补充说明, 本实施例所述的数据传输方法具体流程请参见图 7, 包括步骤:
701、 RRU向双工器发送所述时域数据, 以进行双工选择处理。
在本步骤中, RRU对时域数据进行双工选择处理。 经过双工选择处理得 到的数据仍为时域数据。 本步骤所执行的操作与现有技术中一致, 这里不再 赘述。
702、 RRU向低噪声放大器发送所述经过双工选择处理的时域数据, 以进 行低噪声放大处理。
在本步骤中, RRU对所述经过双工选择处理的时域数据进行低噪声放大 处理。 经过低噪声放大处理得到的数据仍为时域数据。 本步骤所执行的操作 与现有技术中一致, 这里不再赘述。
703、 RRU向收发信机发送所述经过低噪声放大处理的时域数据, 以进行
下变频和滤波处理。
在本步骤中, RRU对所述经过低噪声放大处理的时域数据进行下变频和 滤波处理, 收发信机会将时域数据由射频信号形式转换为中频信号形式。 经 过收发信机处理得到的数据仍为时域数据。 本步骤所执行的操作与现有技术 中一致, 这里不再赘述。
704、 RRU向数字中频处理单元发送所述经过下变频和滤波处理的时域数 据, 以进行数字中频处理。
在本步骤中, RRU对所述经过下变频和滤波处理后得到的时域数据进行 数字中频处理。 经过数字中频处理得到的数据仍为时域数据。 本步骤所执行 的操作与现有技术中一致, 这里不再赘述。 处理。
在现有技术中, 基带处理中的 OFDM符号生成逆处理在 BBU中执行。 其中, OFDM符号生成逆处理具体包括: 去 CP处理、 FFT和解频域资源映射 处理。 逆处理, 使得所述时域数据转换为频域数据。
706、 RRU通过 CPRI向 BBU发送所述经过 OFDM符号生成逆处理所得 到的频域数据。
在现有技术中, RRU不会通过 CPRI向 BBU发送所述经过 OFDM符号 生成逆处理所得到的频域数据, 所述 OFDM符号生成逆处理在 BBU中执行, 经过所述 OFDM符号生成逆处理得到的频域数据会继续留在 BBU内部进行 多天线 MIMO译码处理。
在本步骤中, RRU通过 CPRI向 BBU发送所述经过 OFDM符号生成逆 处理所得到的频域数据。 即 OFDM符号生成逆处理操作转由 RRU执行。
707、 BBU通过所述 CPRI接收所述 RRU发送的频域数据。
在现有技术中 , RRU通过 CPRI向 BBU发送时域数据, 即在 CPRI中传 输时域数据。
在本步骤中, BBU通过所述 CPRI接收所述 RRU发送的频域数据。 经过
OFDM符号生成逆处理得到的数据为频域数据, 即在本步骤中, CPRI中传输 频域数据。
在 CPRI 中传输频域数据使得通信系统能够根据负载或者频率资源的实 际使用情况动态调整 CPRI带宽,而不用像现有技术中传输时域数据时必须分 配固定的 CPRI带宽。
708、 BBU对所述 RRU发送的频域数据进行多天线 MIMO译码。
在本步骤中, BBU对所述 RRU发送的频域数据进行多天线 MIMO译码。 经过多天线 MIMO编码得到的数据仍为频域数据。 其中, 多天线 MIMO译码 具体包括: 信道均衡和多天线信号合并处理。 本步骤所执行的操作与现有技 术中一致, 这里不再赘述。
709、 BBU对所述经过多天线 MIMO译码的频域数据进行星座符号解调。 在本步骤中, BBU对所述经过多天线 MIMO译码的频域数据进行星座符 号解调。 经过星座符号解调得到的数据仍为频域数据。 其中, 星座符号解调 具体包括: 星座符号到比特软信息的计算。 本步骤所执行的操作与现有技术 中一致, 这里不再赘述。
710、 BBU对所述经过星座符号解调的频域数据进行信道译码。
在本步骤中, BBU对所述经过星座符号解调的频域数据进行信道译码。 经过信道译码得到的数据仍为频域数据。 其中, 信道译码具体包括: 比特解 扰、 解速率匹配、 译码解交织、 码块 CRC校验、 解分段和传输快 CRC校验。 本步骤所执行的操作与现有技术中一致, 这里不再赘述。
在本实施例中, 如图 8所示, 为本实施例所述数据传输方法流程对应的 数据传输过程图, 包括: RRU中具体由双工器 801执行的双工选择处理、 具 体由低噪声放大器 802执行的低噪声放大处理、 具体由收发信机 803执行的 下变频和滤波处理、 具体由数字中频处理单元 804 执行的数字中频处理、 OFDM符号生成逆处理 805, BBU执行多天线 MIMO译码 806、 星座符号解 调 807和信道译码 808,通过将原来在 BBU中进行的 OFDM符号生成逆处理 805转移到 RRU中进行, 使得在 BBU和 RRU之间的 CPRI由固定传输时域 数据转换为传输频域数据。 可以显著降低 CPRI速率, 而且使得通信系统能够 根据负载和频率资源的使用情况动态调整 CPRI带宽, 从而有效降低 CPRI带
宽。
本发明第五实施例将对一种数据传输系统进行详细说明, 本实施例所述 系统中包含一个或多个单元用于实现前述方法的一个或多个步骤。 因此, 对 前述方法中各步骤的描述适用于所述系统中相应的单元。 本实施例所述的数 据传输系统具体结构请参见图 9, 包括:
基带处理单元 BBU90和射频拉远单元 RRU90, BBU90和 RRU91通过通 用公共无线接口 CPRI连接, 其中,
BBU90进一步包括:
信道编码单元 901 , 用于对频域数据进行信道编码。
信道编码单元 901 对频域数据进行信道编码。 经过信道编码得到的数据 仍为频域数据。 其中, 信道编码具体包括: 加传输块 CRC、 块码分段、 加码 块 CRC、 编码交织、 速率匹配、 码块级联和比特加扰。 信道编码单元 901所 执行的操作与第二实施例步骤 401—致, 这里不再赘述。
星座符号调制单元 902, 与信道编码单元 901通信连接, 用于对所述经过 信道编码的频域数据进行星座符号调制。
星座符号调制单元 902对所述经过信道编码的频域数据进行星座符号调 制。 经过星座符号调制得到的数据仍为频域数据。 其中, 星座符号调制具体 包括: 比特到星座图的映射处理。 星座符号调制单元 902 所执行的操作与第 二实施例步骤 402—致, 这里不再赘述。
多天线 MIMO编码单元 903 , 与星座符号调制单元 902通信连接, 用于 对所述经过星座符号调制的频域数据进行多天线 MIMO编码。
多天线 MIMO编码单元 903对所述经过星座符号调制的频域数据进行多 天线 MIMO编码。 经过多天线 MIMO编码得到的数据仍为频域数据。 其中, 多天线 MIMO编码具体包括: 空间层的映射、 预编码或者 Beam-forming。 多 天线 MIMO编码单元 903所执行的操作与第二实施例步骤 403—致, 这里不 再赘述。
第一发送单元 904, 与多天线 MIMO编码单元 903通信连接, 用于通过 所述 CPRI向所述 RRU发送经过多天线多进多出 MIMO编码的频域数据。
在现有技术中, BBU不会通过 CPRI向 RRU发送经过多天线 MIMO编
码的频域数据,所述经过多天线 MIMO编码的频域数据会继续留在 BBU内部 进行 OFDM符号生成处理。 即 OFDM符号生成处理操作由 BBU执行。
在本实施例系统中, 第一发送单元 904通过 CPRI向 RRU91发送经过多 天线 MIMO编码的频域数据。即 OFDM符号生成处理操作转由 RRU91执行。
所述 RRU91进一步包括:
第一接收单元 911 , 用于通过所述 CPRI接收所述 BBU发送的频域数据。 在现有技术中, BBU通过 CPRI向 RRU发送经过 OFDM符号生成处理 后得到的时域数据, 即在 CPRI中传输时域数据。
在本实施例系统中, 第一接收单元 911通过所述 CPRI接收所述 BBU90 发送的频域数据。 经过多天线 MIMO编码后得到的数据仍为频域数据, 即在 CPRI中传输频域数据。
在 CPRI 中传输频域数据使得通信系统能够根据负载或者频率资源的实 际使用情况动态调整 CPRI带宽,而不用像现有技术中传输时域数据时必须分 配固定的 CPRI带宽。
OFDM符号生成单元 912,与第一接收单元 911通信连接,用于对所述通 过所述 CPRI接收的频域数据进行正交频分复用 OFDM符号生成处理, 使得 所述频域数据转换为时域数据。
在现有技术中, 基带处理中的 OFDM符号生成处理在 BBU中执行。 其 中, OFDM符号生成处理具体包括: 频域资源映射、 IFFT和加 CP处理。 的频域数据进行 OFDM符号生成处理, 使得所述通过 CPRI传输的频域数据 转换为时域数据。
通过将原来在 BBU中进行的 OFDM符号生成处理转移到 RRU中进行, 使得在 BBU和 RRU之间的 CPRI由固定传输时域数据转换为传输频域数据。 使得通信系统能够根据负载和频率资源的使用情况动态调整 CPRI带宽,从而 有效降低 CPRI带宽。
第一数字中频处理单元 913 , 与 OFDM符号生成单元 912通信连接, 用 于接收所述经过 OFDM符号生成处理后得到的时域数据, 并进行数字中频处 理。
第一数字中频处理单元 913对所述经过 OFDM符号生成处理后得到的时 域数据进行数字中频处理。 经过数字中频处理得到的数据仍为时域数据。 第 一数字中频处理单元 913所执行的操作与第二实施例步骤 407—致, 这里不 再赘述。
第一收发信机 914, 与第一数字中频处理单元 913通信连接, 用于接收所 述经过数字中频处理的时域数据, 并进行上变频和滤波处理。
第一收发信机 914对所述经过数字中频处理的时域数据进行上变频和滤 波处理, 第一收发信机 914会将时域数据由中频信号形式转换为射频信号形 式。 经过第一收发信机 914处理得到的数据仍为时域数据。 第一收发信机 914 所执行的操作与第二实施例步骤 408—致, 这里不再赘述。
功率放大器 915, 与第一收发信机 914通信连接, 用于接收所述经过上变 频和滤波处理的时域数据, 并进行功率放大处理。
功率放大器 915对所述经过上变频和滤波处理的时域数据进行功率放大 处理。 经过功率放大处理得到的数据仍为时域数据, 且为射频信号形式。 功 率放大器 915所执行的操作与第二实施例步骤 409—致, 这里不再赘述。
第一双工器 916, 与功率放大器 915通信连接, 用于接收所述经过功率放 大处理的时域数据, 并进行双工选择处理。
第一双工器 916对所述经过功率放大处理的时域数据进行双工选择处理。 经过双工选择处理得到的数据仍为时域数据, 且为射频信号形式。 最后 RRU 经由天线把所述射频信号形式的时域数据发送出去。
在本实施例中, 通过将原来在 BBU90中的 OFDM符号生成单元 912转 移到 RRU91中, 使得在 BBU90和 RRU91之间的 CPRI由固定传输时域数据 转换为传输频域数据。 可以显著降低 CPRI速率, 而且使得通信系统能够根据 负载和频率资源的使用情况动态调整 CPRI带宽, 从而有效降低 CPRI带宽。
本发明第六实施例将对一种数据通信系统进行详细说明, 本实施例所述 系统中包含一个或多个单元用于实现前述方法的一个或多个步骤。 因此, 对 前述方法中各步骤的描述适用于所述系统中相应的单元。 本实施例所述的数 据传输系统具体结构请参见图 10, 包括:
射频拉远单元 RRU100 和基带处理单元 BBU101 , 所述 RRU100 和
BBU101通过通用公共无线接口 CPRI连接, 其中,
所述 RRU100进一步包括:
第二双工器 1001 , 用于接收所述时域数据, 以进行双工选择处理。 第二 双工器 1001所执行的操作与第五实施例中的第一双工器 916所执行的操作互 为逆操作, 请参见第四实施例步骤 701的相关记载, 这里不再赘述。
低噪声放大器 1002, 与第二双工器 1001通信连接, 用于接收所述经过双 工选择处理的时域数据, 以进行低噪声放大处理。 低噪声放大器 1002所执行 的操作与第五实施例中的功率放大器 915 所执行的操作互为逆操作, 请参见 第四实施例步骤 702的相关记载, 这里不再赘述。
第二收发信机 1003 , 与低噪声放大器 1002通信连接, 用于接收所述经过 低噪声放大处理的时域数据, 以进行下变频和滤波处理。 第二收发信机 1003 所执行的操作与第五实施例中的第一收发信机 914所执行的操作互为逆操作, 请参见第四实施例步骤 703的相关记载, 这里不再赘述。
第二数字中频处理单元 1004, 与第二收发信机 1003通信连接, 用于接收 所述经过下变频和滤波处理的时域数据, 以进行数字中频处理。 第二数字中 频处理单元 1004所执行的操作与第五实施例中的第一数字中频处理单元 913 所执行的操作互为逆操作, 请参见第四实施例步骤 704 的相关记载, 这里不 再赘述。
OFDM符号生成逆处理单元 1005,与第二数字中频处理单元 1004通信连 接, 用于对经过数字中频处理的时域数据进行正交频分复用 OFDM符号生成 逆处理,使得所述时域数据转换为频域数据。 OFDM符号生成逆处理单元 1005 所执行的操作与第五实施例中的 OFDM符号生成单元 912所执行的操作互为 逆操作, 请参见第四实施例步骤 705的相关记载, 这里不再赘述。
第二发送单元 1006, 与 OFDM符号生成逆处理单元 1005通信连接, 用 于通过所述 CPRI向所述 BBU发送所述经过 OFDM符号生成逆处理所得到的 频域数据。
所述 BBU101进一步包括:
第二接收单元 1011 ,用于通过所述 CPRI接收所述 RRU发送的频域数据。 多天线 MIMO译码单元 1012, 与第二接收单元 1011通信连接, 用于对
所述 RRU发送的频域数据进行多天线 MIMO译码。 多天线 MIMO译码单元 1012所执行的操作与第五实施例中的多天线 MIMO编码单元 903所执行的操 作互为逆操作, 请参见第四实施例步骤 708的相关记载, 这里不再赘述。
星座符号解调单元 1013 , 与多天线 MIMO译码单元 1012通信连接, 用 于对所述经过多天线 MIMO译码的频域数据进行星座符号解调。 星座符号解 调单元 1013所执行的操作与第五实施例中的星座符号调制单元 902所执行的 操作互为逆操作, 请参见第四实施例步骤 709的相关记载, 这里不再赘述。
信道译码单元 1014, 与星座符号解调单元 1013通信连接, 用于对所述经 过星座符号解调的频域数据进行信道译码。 信道译码单元 1014所执行的操作 与第五实施例中的信道编码单元 901 所执行的操作互为逆操作, 请参见第四 实施例步骤 710的相关记载, 这里不再赘述。
在本实施例中, 通过将原来在 BBU101中的 OFDM符号生成逆处理单元 1005转移到 RRU100中, 使得在 BBU101和 RRU100之间的 CPRI由固定传 输时域数据转换为传输频域数据。 可以显著降低 CPRI速率, 而且使得通信系 统能够根据负载和频率资源的使用情况动态调整 CPRI 带宽, 从而有效降低 CPRI带宽。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤 是可以通过程序来指令相关的硬件完成, 所述的程序可以存储于一种计算机 可读存储介质中, 上述提到的存储介质可以是只读存储器, 磁盘或光盘等。
以上对本发明所提供的一种数据传输方法和系统进行了详细介绍, 对于 本领域的一般技术人员, 依据本发明实施例的思想, 在具体实施方式及应用 范围上均会有改变之处, 综上所述, 本说明书内容不应理解为对本发明的限 制。
Claims
1、 一种数据传输方法, 其特征在于, 包括:
基带处理单元 BBU通过通用公共无线接口 CPRI向射频拉远单元 RRU发 送经过多天线多进多出 MIMO编码的频域数据;
所述 RRU通过所述 CPRI接收所述 BBU发送的频域数据;
所述 RRU对所述通过所述 CPRI接收的频域数据进行正交频分复用
OFDM符号生成处理, 使得所述频域数据转换为时域数据。
2、 根据权利要求 1所述的方法, 其特征在于, 所述 BBU通过 CPRI向 RRU发送经过多天线 MIMO编码的频域数据之前进一步包括:
所述 BBU对所述频域数据进行信道编码;
所述 BBU对所述经过信道编码的频域数据进行星座符号调制;
所述 BBU对所述经过星座符号调制的频域数据进行多天线 MIMO编码。
3、根据权利要求 1或 2所述的方法,其特征在于,所述 RRU对所述 BBU 发送的频域数据进行 OFDM符号生成处理之后进一步包括:
所述 RRU向数字中频处理单元发送所述经过 OFDM符号生成处理后得 到的时域数据, 以进行数字中频处理;
所述 RRU向收发信机发送所述经过数字中频处理的时域数据, 以进行上 变频和滤波处理;
所述 RRU向功率放大器发送所述经过上变频和滤波处理的时域数据, 以 进行功率放大处理;
所述 RRU向双工器发送所述经过功率放大处理的时域数据, 以进行双工 选择处理。
4、 一种数据传输方法, 其特征在于, 包括:
射频拉远单元 RRU对经过数字中频处理的时域数据进行正交频分复用 OFDM符号生成逆处理, 使得所述时域数据转换为频域数据;
所述 RRU通过通用公共无线接口 CPRI向基带处理单元 BBU发送所述经 过 OFDM符号生成逆处理所得到的频域数据;
所述 BBU通过所述 CPRI接收所述 RRU发送的频域数据。
5、 根据权利要求 4所述的方法, 其特征在于, 所述 RRU对经过数字中
频处理的时域数据进行 OFDM符号生成逆处理之前进一步包括: 所述 RRU向双工器发送所述时域数据, 以进行双工选择处理;
所述 RRU向低噪声放大器发送所述经过双工选择处理的时域数据, 以进 行低噪声放大处理;
所述 RRU向收发信机发送所述经过低噪声放大处理的时域数据, 以进行 下变频和滤波处理;
所述 RRU向数字中频处理单元发送所述经过下变频和滤波处理的时域数 据, 以进行数字中频处理。
6、 根据权利要求 4或 5所述的方法, 其特征在于, 所述 BBU通过所述 CPRI接收所述 RRU发送的频域数据之后进一步包括:
所述 BBU对所述 RRU发送的频域数据进行多天线 MIMO译码; 所述 BBU对所述经过多天线 MIMO译码的频域数据进行星座符号解调; 所述 BBU对所述经过星座符号解调的频域数据进行信道译码。
7、 一种数据传输系统, 其特征在于, 包括: 基带处理单元 BBU和射频 拉远单元 RRU, 所述 BBU和 RRU通过通用公共无线接口 CPRI连接, 其中, 所述 BBU进一步包括:
第一发送单元, 用于通过所述 CPRI向所述 RRU发送经过多天线多进多 出 MIMO编码的频域数据;
所述 RRU进一步包括:
第一接收单元, 用于通过所述 CPRI接收所述 BBU发送的频域数据; OFDM符号生成单元,用于对所述通过所述 CPRI接收的频域数据进行正 交频分复用 OFDM符号生成处理, 使得所述频域数据转换为时域数据。
8、 根据权利要求 7所述的系统, 其特征在于, 所述 BBU进一步包括: 信道编码单元, 用于对所述频域数据进行信道编码;
星座符号调制单元, 用于对所述经过信道编码的频域数据进行星座符号 调制;
多天线 MIMO编码单元, 用于对所述经过星座符号调制的频域数据进行 多天线 MIMO编码。
9、 根据权利要求 7或 8所述的系统, 其特征在于, 所述 RRU进一步包
括:
第一数字中频处理单元, 用于接收所述经过 OFDM符号生成处理后得到 的时域数据, 并进行数字中频处理;
第一收发信机, 用于接收所述经过数字中频处理的时域数据, 并进行上 变频和滤波处理;
功率放大器, 用于接收所述经过上变频和滤波处理的时域数据, 并进行 功率放大处理;
第一双工器, 用于接收所述经过功率放大处理的时域数据, 并进行双工 选择处理。
10、 一种数据传输系统, 其特征在于, 包括: 射频拉远单元 RRU和基带 处理单元 BBU, 所述 RRU和 BBU通过通用公共无线接口 CPRI连接, 其中, 所述 RRU进一步包括:
OFDM符号生成逆处理单元, 用于对经过数字中频处理的时域数据进行 正交频分复用 OFDM符号生成逆处理, 使得所述时域数据转换为频域数据; 第二发送单元,用于通过所述 CPRI向所述 BBU发送所述经过 OFDM符 号生成逆处理所得到的频域数据;
所述 BBU进一步包括:
第二接收单元, 用于通过所述 CPRI接收所述 RRU发送的频域数据。
11、 根据权利要求 10所述的系统, 其特征在于, 所述 RRU进一步包括: 第二双工器, 用于接收所述时域数据, 以进行双工选择处理;
低噪声放大器, 用于接收所述经过双工选择处理的时域数据, 以进行低 噪声放大处理;
第二收发信机, 用于接收所述经过低噪声放大处理的时域数据, 以进行 下变频和滤波处理;
第二数字中频处理单元, 用于接收所述经过下变频和滤波处理的时域数 据, 以进行数字中频处理。
12、 根据权利要求 10或 11所述的系统, 其特征在于, 所述 BBU进一步 包括:
多天线 MIMO译码单元, 用于对所述 RRU发送的频域数据进行多天线
MIMO译码;
星座符号解调单元, 用于对所述经过多天线 MIMO译码的频域数据进行 星座符号解调;
信道译码单元, 用于对所述经过星座符号解调的频域数据进行信道译码。
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| EP3113540A4 (en) * | 2014-04-04 | 2017-03-15 | Huawei Technologies Co., Ltd. | Method and device for adjusting data transmission rate |
| CN111093293A (zh) * | 2018-10-23 | 2020-05-01 | 大唐移动通信设备有限公司 | 一种天线信号的处理方法及装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103546412A (zh) | 2014-01-29 |
| EP2874365A4 (en) | 2015-07-22 |
| US20150117277A1 (en) | 2015-04-30 |
| EP2874365A1 (en) | 2015-05-20 |
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