WO2012083718A1 - 一种下行基带信号生成方法及相关设备、系统 - Google Patents
一种下行基带信号生成方法及相关设备、系统 Download PDFInfo
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- WO2012083718A1 WO2012083718A1 PCT/CN2011/078894 CN2011078894W WO2012083718A1 WO 2012083718 A1 WO2012083718 A1 WO 2012083718A1 CN 2011078894 W CN2011078894 W CN 2011078894W WO 2012083718 A1 WO2012083718 A1 WO 2012083718A1
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
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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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
Definitions
- the present invention relates to the field of communications technologies, and in particular, to a downlink baseband signal generating method, related device, and system.
- the base station In a distributed base station with a remote radio frequency, the base station is divided into two parts: a base-band unit (BBU) and a radio remote unit (RRU).
- BBU base-band unit
- RRU radio remote unit
- the RRU is placed at an access point farther from the BBU, which is connected by fiber and transmits the baseband signal in analog or digital mode.
- the Distributed Antenna System is similar to the distributed base station with remote radio, but the distance between the BBU and the RRU can be extended to several kilometers or even tens of kilometers, and the direct connection between the BBU and the RRU is directly
- an optical optical network connection such as a Passive Optical Network (PON) or a Wavelength Division Multiplexing (WDM) may be used, and a multi-cell joint processing method is preferably used, for example, Network multiple input multiple output (Multi-Input
- MIMO Multiple-Output
- multi-cell joint scheduling etc. to reduce interference between cells and further increase system capacity.
- Cloud Radio Access Network Cloud Radio Access Network
- C-RAN is a larger-scale wireless access system based on the application of cloud computing technology based on DAS technology.
- the C-RAN connects the BBUs of multiple base stations through optical fibers or optical transmission networks, and uses cloud computing technology to virtualize the processing resources of all BBUs into a unified resource pool, so that the system can implement signal processing resources.
- Statistical multiplexing which greatly reduces system costs.
- the C-RAN can also adopt a multi-cell joint processing method such as DAS to improve system capacity.
- FIG. 1 is a schematic diagram of a conventional C-RAN system architecture.
- the C-RAN system includes multiple C-RAN nodes, and multiple C-RAN nodes transmit between large-capacity optical fibers or optical fibers. Network connection.
- Each C-RAN node and a RRU in a cluster adopt a star or ring type and are connected through a direct optical fiber or optical transmission network.
- Each C-RAN node is mainly responsible for the processing of user (RS) radio access in its own cell group, including physical layer signal processing, media access control (MAC) processing, and radio resource management (RRM).
- RS user
- MAC media access control
- RRM radio resource management
- each C-RAN node can wirelessly access a part of users of other C-RAN node cell groups when its own processing load is light, that is, when the user traffic in its own cell group is not large. deal with.
- some cells may be used.
- the baseband wireless signal is routed to a C-RAN node with less user traffic and lighter load in the cell group through a large-capacity optical fiber or optical transmission network connecting each C-RAN node.
- FIG. 2 is a schematic structural diagram of a conventional C-RAN node. Among them, Figure 2 only shows the main functional modules of the C-RAN node. The actual C-RAN node also includes other functional modules such as timing unit, control unit and interface unit. As shown in FIG. 2, a C-RAN node may include multiple BBUs, each BBU is responsible for physical layer signal processing of some users, and may also include processing such as MAC/RRM; and also includes an exchange unit, the exchange unit and each RRU.
- BBUs each BBU is responsible for physical layer signal processing of some users, and may also include processing such as MAC/RRM; and also includes an exchange unit, the exchange unit and each RRU.
- connection is also connected to other C-RAN nodes for exchanging the baseband signals of the RRUs connected to the C-RAN nodes and the baseband signals from other C-RAN nodes to the respective BBUs for processing; the RRU mainly completes the transceivers.
- (TRX) module function that is, in the downlink direction, it is responsible for converting the downlink baseband signal into a radio frequency signal and performing power amplification, and then transmitting through the antenna; receiving the uplink radio frequency signal from the antenna in the uplink direction and converting it into a baseband signal after being amplified.
- 3G third-generation
- 4G fourth-generation
- multi-antenna technology such as MIMO is widely applied, resulting in an increasingly large signal transmission bandwidth between the C-RAN node and the RRU. Therefore, how to reduce the signal transmission bandwidth requirement between the C-RAN node and the RRU is very important.
- a downlink baseband signal generating method, related device, and system are provided. To reduce the signal transmission bandwidth between the C-RAN node and the RRU.
- the embodiment of the invention provides a method for generating a downlink baseband signal, which includes:
- An embodiment of the present invention provides another method for generating a downlink baseband signal, including:
- the downlink user code modulation signal is that the radio access network node passes the user of the certain cell
- the downlink data stream is obtained by channel coding and modulation processing; the downlink control channel signal is generated by the radio access network node according to physical layer control information; and the downlink user code modulated signal is multi-input and multi-output pre- Encoding process
- the baseband signal is sent out.
- an embodiment of the present invention provides a radio access network node, including:
- At least one baseband processing unit and switching unit At least one baseband processing unit and switching unit;
- the baseband processing unit includes:
- a data channel coding and modulating module configured to perform channel coding and modulation processing on a downlink data stream of a cell user, obtain a downlink user code modulation signal of the cell, and output the signal to the switching unit;
- a downlink control channel generating module configured to generate a downlink control channel signal according to the physical layer control information, and output the signal to the switching unit;
- the switching unit is configured to exchange a reference signal, a synchronization signal, a broadcast channel signal, and the downlink user code modulated signal and the downlink control channel signal to a corresponding radio frequency unit, so that the radio frequency unit sends the downlink user
- the coded modulated signal is subjected to multiple input multiple output precoding processing, and the multiple input multiple output pre-coded signal and the downlink control channel signal, the reference signal, the synchronization signal, and the broadcast channel signal are respectively mapped to corresponding subcarriers Up, and perform fast Fourier transform processing to obtain a downlink baseband signal and transmit it.
- an embodiment of the present invention provides a radio frequency unit, including:
- a precoding module configured to receive a downlink user code modulated signal and a downlink control channel signal of a cell exchanged by the radio access network node, and perform the multiple input multiple output precoding process on the downlink user code modulated signal;
- the downlink user code modulation signal is obtained by the radio access network node performing channel coding and modulation processing on a downlink data stream of a user of the certain cell;
- the downlink control channel signal is the radio access
- the network node generates the reference signal, the synchronization signal, and the broadcast channel signal of the certain cell exchanged by the radio access network node according to the physical layer control information, and receives the multiple input multiple Outputting the pre-coded signal and the downlink control channel signal, the reference signal, the synchronization signal, and the broadcast channel signal respectively mapped to corresponding subcarriers;
- a transform module configured to perform fast Fourier transform processing on the signal mapped to the subcarrier, to obtain a downlink baseband signal
- a transceiver module configured to send the downlink baseband signal.
- an embodiment of the present invention provides a downlink baseband signal generating system, including the foregoing radio access network node and the foregoing radio frequency unit; wherein, the foregoing radio access network node and the radio frequency unit pass the optical fiber or the light Transfer network connection.
- the C-RAN node after receiving the downlink data stream sent by the cell user, performs channel coding and modulation on the downlink data stream of the cell user to obtain a downlink user code modulated signal of the cell; Synchronization signal, broadcast channel signal, and downlink coded modulated signal And downlink control channel signals are exchanged to the corresponding RRU, and the downlink R-coded modulated signal is subjected to MIMO pre-coding processing by the corresponding RRU, and the reference signal, the synchronization signal, the broadcast channel signal, and the MIMO pre-coded signal and the downlink control channel are used.
- the signals are respectively mapped to corresponding subcarriers, and IFFT transform is performed to obtain a downlink baseband signal and transmitted.
- the MIMO precoding, the signal mapping, and the IFFT transform processing are forwarded to the RRU for processing, so that there is no need to transmit signals on the corresponding subcarriers between the C-RAN node and the RRU, and the C-RAN node and the RRU are reduced. Signal transmission bandwidth between.
- FIG. 1 is a schematic diagram of an existing C-RAN system architecture
- FIG. 2 is a schematic structural diagram of a conventional C-RAN node
- FIG. 3 is a schematic structural view of a conventional BBU
- FIG. 4 is a schematic structural view of a further refinement of the BBU shown in FIG. 3;
- FIG. 5 is a flowchart of a method for generating a downlink baseband signal according to an embodiment of the present invention
- FIG. 6 is a schematic diagram of a physical resource block (PRB) according to an embodiment of the present invention
- FIG. 7 is a schematic diagram of a process for generating an OFDM signal. ;
- FIG. 8 is a schematic diagram of a scenario in which a plurality of cells adopt a network-MIMO-based CoMP process
- FIG. 9 is a flowchart of another method for generating a downlink baseband signal according to an embodiment of the present invention
- FIG. 11 is a schematic structural diagram of an RRU according to an embodiment of the present invention.
- FIG. 12 is a schematic structural diagram of a downlink baseband signal generating system according to an embodiment of the present invention
- FIG. 13 is a schematic structural diagram of another downlink baseband signal generating system according to an embodiment of the present invention.
- the embodiment of the invention provides a downlink baseband signal generation method and related equipment and system, which can be applied to Orthogonal Frequency Division Multiple Access (OFDMA) or similar technologies such as single carrier frequency division multiple access.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- WiMAX Worldwide Interoperability for Microwave Access
- the BBU may be divided into a transform module 301 having a Fast Fourier Transform (FFT) and an Inverse Fast Fourier Transformation (IFFT) capability.
- a resource mapping module 302 having mapping and demapping capabilities and a user signal processing module 303 are shown in FIG.
- the BBU function module of the user plane is mainly used.
- the BBU may also include control channel processing, power control, hybrid automatic repeat reQuest (HARQ)/adaptive modulation.
- Physical layer process control modules such as Adaptive Modulation and Coding (AMC) and random access, and may also include upper layer protocol processing function modules such as MAC/RRM.
- FIG. 4 is a schematic structural view of the BBU shown in FIG.
- the user signal processing module 303 can be refined into a data channel coding and modulation module 3031 (mainly including a channel coding unit 30311 and a modulation unit 30312), a downlink control channel generation module 3032, and a precoding module 3033 (mainly including a MIMO precoding unit 30331).
- the signal processing is a period of a certain transmission time interval ( ⁇ ).
- the LTE system it is a sub-frame, including 14 OFDM symbols, corresponding to a time of 1 ms.
- the downlink data streams of the user 1 to the user k respectively generate a downlink user code modulated signal and a downlink user code modulated signal after the channel coding unit 30311, the modulation unit 30312, and the MIMO precoding unit 30331. And being mapped to the corresponding sub-carrier by the resource mapping module 302.
- the physical layer control message generated by the BBU is generated by the downlink control channel generating module 3032, and the downlink control channel signal is also generated by the resource mapping module 302.
- the downlink control channel generating module 3032 may also include a channel coding, a modulation, a MIMO precoding, and the like; in addition, the resource mapping module 302 also generates a reference signal and a synchronization signal generated internally by the BBU. And the broadcast channel signal is mapped onto a particular subcarrier at some fixed OFDM symbol location.
- a downlink frequency domain signal can be formed, and the downlink frequency domain signal is processed by the IFFT transform of the transform module 301 to generate a downlink baseband signal in the time domain; the downlink baseband signal can pass
- the switching unit included in the C-RAN node is switched to the corresponding RRU, and the corresponding RRU is responsible for converting the downlink baseband signal into a radio frequency signal and performing power amplification and transmitting through the antenna.
- the signal on the corresponding subcarrier needs to be transmitted between the BBU and the RRU, so that the signal transmission bandwidth requirement between the C-RAN node including the multiple BBUs and the RRU is high.
- FIG. 5 is a schematic flowchart diagram of a method for generating a downlink baseband signal according to an embodiment of the present invention. As shown in Figure 5, the method can include the following steps:
- the C-RAN node includes multiple BBUs, and each BBU serves one cell; the C-RAN may receive the downlink data stream sent by the user of the cell served by the BBU through the BBU included therein, or C- The RAN node may also receive downlink data streams sent by users of other cells exchanged by other C-RAN nodes through the BBUs included therein, and perform channel coding and modulation processing on the downlink data streams to obtain downlink user code modulated signals of the corresponding cells. .
- Quadrature Phase Shift Keying QPSK
- 16 Quadrature Amplitude Modulation 16QAM
- 64 Quadrature Amplitude Modulation 64QAM
- the downlink data stream of the user is modulated to obtain a downlink user code modulated signal.
- the BBU included in the C-RAN node may generate physical layer control information in each transmission time interval ( ⁇ ), and further, the BBU may generate a downlink control channel by using the downlink control channel generation module to generate physical layer control information. signal.
- the downlink control channel signal is mainly used to control the bandwidth, signal to noise ratio, and the like of the downlink channel. 503.
- the reference signal, the synchronization signal, the broadcast channel signal, and the downlink user code modulated signal and the downlink control channel are exchanged to the corresponding RRU, so that the corresponding RRU performs the MIMO precoding process on the downlink data modulated signal, and
- the reference signal, the synchronization signal, the broadcast channel signal, the MIMO pre-coded signal, and the downlink control channel signal are respectively mapped to corresponding subcarriers, and subjected to IFFT conversion processing to obtain a downlink baseband signal and transmit it.
- the above reference signal is mainly used to provide reference information for various signals, such as signal amplitude, frequency, etc.; and the synchronization signal is mainly used to provide synchronization time slots to realize synchronization of various signals; the broadcast channel signal is mainly used to provide each Broadcast channel information; this is common knowledge of those skilled in the art, and the embodiments of the present invention are not described herein.
- the C-RAN node may exchange the reference signal, the synchronization signal, the broadcast channel signal, and the downlink user code modulated signal and the downlink control channel signal to the corresponding RRU according to the preset switch configuration list;
- the exchange configuration list is used to record the correspondence between the user information and the corresponding RRU information.
- the user information may be a parameter indicating the identity of the user, such as an International Mobile Equipment Identity (IMEI);
- IMEI International Mobile Equipment Identity
- the RRU information may be a representation of the RRU.
- the MIMO precoding, the signal mapping, and the IFFT transform processing are processed before being forwarded to the switching unit. For example, in one embodiment, it may be forwarded to the RRU for processing, so that there is no need to transmit signals on the corresponding subcarriers between the C-RAN node and the RRU, and the signal transmission bandwidth between the C-RAN node and the RRU is reduced.
- the air interface resources between the C-RAN node and the RRU are generally divided into resource blocks, and FIG. 6 shows a schematic diagram of a physical resource block (PRB).
- the PRB includes M consecutive OFDM symbols in the time domain and N consecutive subcarriers in the frequency domain.
- the time and frequency resources allocated to each user are usually logically a virtual resource block (VRB), and the system maps the VRB allocated by the user according to a predetermined algorithm.
- VRB virtual resource block
- the VRB and the PRB have the same size, that is, 7 OFDM symbols and 12 subcarriers, and the VRB can be mapped to the PRB in one subframe.
- the system allocates resources for the user, it specifies the type, number, and size of the corresponding VRB resource, that is, the VRB indication information.
- resource mapping is to allocate signals of respective users to corresponding subcarriers
- resource demapping is from corresponding subcarriers. Separate the signals of individual users.
- VRB is generally divided into two types: localized and discrete.
- the centralized VRB corresponds to consecutive subcarriers, which is beneficial to frequency selective scheduling and MIMO precoding.
- Discrete VRB will be a user.
- the subcarriers are dispersed into the entire system bandwidth, and the frequency diversity gain can be obtained.
- the discrete VRB is usually used to transmit small data traffic such as Voice over Internet Protocol (VoIP).
- VoIP Voice over Internet Protocol
- VRB is also the smallest physical layer wireless transmission parameter configuration unit, that is, whether it is a centralized VRB or a discrete VRB, a user's data stream is in a VRB.
- the subcarriers always have the same coded modulation scheme and transmit power, and the user transmission has the same MIMO mode and MIMO precoding matrix within one VRB.
- the foregoing describes a downlink baseband signal generation method provided in the embodiment of the present invention, which can reduce the signal transmission bandwidth between the C-RAN node and the RRU.
- the downlink baseband signal generating method provided by the embodiment of the present invention is further described below in conjunction with a specific embodiment.
- Embodiment 1 is a diagrammatic representation of Embodiment 1:
- the C-RAN The precoding unit of each BBU included by the node mainly used for MIMO precoding
- the resource mapping module mainly used for mapping and demapping
- the transform module mainly used for FFT/IFFT transform processing
- Downstream data modulation signals ie, modulation symbol sequences
- each data stream one user may simultaneously transmit multiple data streams through multiple antennas
- each VRB of an active user a user having a data stream to transmit
- precoding codebook index index corresponding to each VRB in the current frame, and the transmit signal amplitude (or transmit power);
- the VRB resource information allocated by each active user in the current port that is, the VRB indication information (type, number, size, and other information of the VRB resource);
- the foregoing transmission resource indication information may be carried in a downlink control channel signal sent by a C-RAN node, and the RRU may perform the MIMO pre-programmed signal and the downlink control by using the foregoing transmission resource indication information.
- the channel signals are respectively mapped to the corresponding subcarriers, wherein the foregoing transmission resource indication information is used to indicate the subcarriers corresponding to the MIMO pre-coded signal and the downlink control channel signal respectively.
- the C-RAN node may also construct a new transmission message carrying the foregoing transmission resource indication information and send the information to the RRU, so that the RRU may perform the MIMO pre-coding according to the foregoing transmission resource indication information carried by the new transmission message.
- the coded signal and the downlink control channel signal are respectively mapped to the corresponding subcarriers, which are not limited in the embodiment of the present invention.
- the BBI after the BBU generates the downlink user code modulated signal, the BBI directly exchanges the precoding module in the corresponding RRU to perform MIMO precoding processing, and the MIMO precoding process is performed by the resource mapping module in the corresponding RRU.
- the fixed, resource mapping module may map the reference signal, the synchronization signal, and the broadcast channel signal to corresponding subcarriers; and then perform the IFFT transform on the signals on all the subcarriers by the transform module in the corresponding RRU to obtain the downlink baseband.
- the signal is sent out through the Transceiver (TRX) module
- the reference signal occupies about 5 ⁇ 15% of the system resources (related to the number of transmitting antennas, the moving rate, etc.). Since the position of the reference signal in the time-frequency resource is fixed, the modulation mode is also fixed (usually QPSK).
- the reference signal sequence is also pre-determined, and the broadcast channel information and the synchronization signal have similar characteristics. Therefore, the method provided by the embodiment of the present invention can prevent the C-RAN node from transmitting the reference signal between the RRU and the RRU.
- the broadcast channel signal and the synchronization signal and the like correspond to the signals on the subcarriers, thereby further compressing the transmission rate, thereby reducing the signal transmission bandwidth.
- the data stream transmitted between the C-RAN node and the RRU in the embodiment of the present invention is not the MIMO pre-coded user stream, instead of the MIMO pre-coded signal stream.
- the function of MIMO precoding can be described as:
- x represents the MIMO precoded signal vector
- W is the M X precoding matrix
- M is the number of transmit antennas
- ⁇ ⁇ is the number of data streams simultaneously transmitted by the user
- S is the data stream vector of a cell.
- the system usually defines a precoding matrix codebook (a pre-designed set of precoding matrices) that indicates the precoding matrix used by the precoding matrix index (index).
- a sub-carrier of a user's data stream in a VRB always has the same coding modulation mode and transmission power, and the user transmission has the same MIMO mode and MIMO precoding matrix in one VRB. Therefore, if the K data streams of each active user before MIMO precoding are transmitted separately, instead of transmitting the signal stream after MIMO precoding.
- the transmission rate can be reduced and the signal transmission bandwidth requirement can be reduced.
- the subcarriers in a VRB of a certain data stream of a user can always have the same coding modulation mode and transmission power characteristics. , further compress the transmission rate.
- one data stream of one user includes I/Q channels
- one VRB includes 12 subcarriers.
- the signals have the same modulation mode, that is, one of QPSK, 16QAM, and 64QAM
- the corresponding I or Q channels are 1 bit, 2 bits, and 3 bits, respectively, and 16 bits are usually used for each sample (corresponding to one subcarrier).
- the information that needs to be transmitted between the C-RAN node and the RRU is exchanged to
- the resource indication information is mapped to the corresponding subcarrier by the resource mapping module; the reference signal, the synchronization signal, and the broadcast channel signal are also mapped to the corresponding subcarriers according to a predetermined rule of the system, and then processed by the IFFT transform of the change module, and generated.
- the downlink baseband signal of the domain is finally processed by the transceiver (TRX) module digital-to-analog conversion, up-conversion, signal amplification, etc. to form a radio frequency signal, which is transmitted through the antenna.
- TRX transceiver
- FIG. 7 further illustrates a downlink OFDM signal generation process in which the frequency domain baseband signal a Nc — x is mapped to N subcarriers by serial-to-parallel conversion, the remaining subcarriers are padded with zeros, and then N-point IFFT is performed to obtain a time domain baseband signal X. , ,..., ⁇ 1 ⁇ 2- ⁇ .
- the resource mapping IFFT conversion process is processed from the BBU. Forwarding to the RRU is performed, so the signal transmission bandwidth between the C-RAN node and the RRU is greatly reduced compared to the direct transmission of the time domain baseband signal.
- the resource mapping and the IFFT transform process are forwarded from the BBU to the RRU, the idle subroutine The signal corresponding to the carrier will not be transmitted, but only the signals of the users on the occupied subcarriers, thereby further reducing the signal transmission bandwidth requirement between the C-RAN node and the RRU.
- the signal transmission bandwidth is reduced by about 40% due to the IFFT conversion process being forwarded from the BBU to the RRU (ignoring the compression factor of the idle subcarriers in the subcarriers), or 1.67 times. Compression, and then, since MIMO precoding is forwarded from the BBU to the RRU, it can be further compressed by about 80% (ignoring the influence of a small amount of information such as transmitting VRB resource information, while ignoring the signals on the corresponding subcarriers such as the reference signal and the synchronization channel. No compression factor required for transmission), or 5 times compression, the total compression ratio is: 100% - 60% X 20% « 88%, ie 8.4 times compression.
- Embodiment 2 is a diagrammatic representation of Embodiment 1:
- the switching unit needs to exchange the downlink user code modulated signals of the multiple cells to the corresponding RRU, so that the corresponding RRU performs MIMO joint precoding processing on the downlink user code modulated signals of the multiple cells, and performs MIMO.
- the combined pre-coded signal and the downlink control channel signal, the reference signal, the synchronization signal, and the broadcast channel signal are respectively mapped onto corresponding subcarriers, and subjected to IFFT conversion processing to obtain a downlink baseband signal and transmitted.
- the foregoing transmission resource indication information is further used to indicate a subcarrier corresponding to the MIMO joint pre-coded signal and the downlink control channel signal, respectively, so that the RRU according to the indication of the transmission resource indication information
- the MIMO joint pre-coded signal and the downlink control channel signal are respectively mapped to corresponding subcarriers.
- FIG. 8 is a schematic diagram showing a scenario in which CoMP processing based on Network-MIMO is performed on multiple cells.
- UE1, UE2, and UE3 belong to cells A, B, and C, respectively, and the three cells are respectively responsible for transmitting data streams a, b, and c to the three UEs, but the downlink signals of the three UEs are respectively There is mutual interference between them, which usually occurs when the 3 cells are geographically adjacent and the 3 UEs are in their adjacent edge regions. In order to eliminate the interference between them (the dotted line in FIG.
- the CoMP processing technology based on Network-MIMO can be adopted, and the transmitting antennas of the three cells are regarded as the antennas of the joint transmission, such that the system
- Each cell has two transmit antennas, which is equivalent to a total of six antennas.
- the data streams a, b, and c that belong to the respective cells respectively need to be shared by the three cells at the same time, so that three cells can be realized.
- Joint precoding The above operation can be expressed by the following mathematical formula:
- W is a MIMO joint precoding matrix of ⁇ , which consists of q MIMO precoding sub-matrices ⁇ , ⁇ , ⁇ , 1 ⁇ , which are the local precoding matrices of each cell That is, for the q joint precoded cells, the precoding operation locally of the kth cell can be expressed as:
- the sub-carriers in one VRB always use the same code modulation mode and transmit power of the data stream of one cell user.
- K data streams of each user jointly precoded by multiple cells before transmission of MIMO precoding between the C-RAN node and the RRU s ⁇ sy ⁇ instead of transmitting the signal stream after MIMO precoding.
- the downlink user code modulated signal that implements joint precoding by using multiple cell shared user data manners, and the MIMO joint precoding is also forwarded from the BBU to the RRU.
- the number q of cells participating in the joint precoding is 2 or 3, and the signal to noise ratio (SNR) of the users at the cell edge is usually not high. 16QAM or even 64QAM is adopted. The case of high-order modulation is very small. Therefore, even if the user data streams of all the jointly precoded cells are simultaneously transmitted to the RRU, the subcarriers within one VRB of a certain data stream of one user always have the same code modulation. The characteristics of the mode and the transmit power can still achieve better bandwidth compression.
- LTE-A in the FDD mode 4 locating three adjacent cells for CoMP processing, that is, users at their edges (usually 10 to 20% of the total number of users), using users based on multiple cells
- Network-MIMO technology of data that is, the downlink user code modulated signal of the user adopts multiple cell joint precoding in the downlink direction, assuming 2 transmit antennas per cell, and users in each CoMP set (ie, users participating in CoMP processing)
- the corresponding CoMP user needs to transmit the I channel or the Q channel of the data stream of the RRU, and each subcarrier corresponds to 4 bits of information, of which two are used.
- the data of QPSK modulation needs to be represented by 2 bits
- the data modulated by 16QAM needs to be represented by 2 bits.
- the embodiment of the present invention is described by taking the C-RAN system as an example, the C-RAN system and all other signals are processed centrally and the antenna/RF is extended by a broadband transmission line such as an optical fiber, such as a DAS system. There is no strict distinction between them, especially in terms of baseband signal transmission, internal structure of the base station, etc., having the same or similar structure. Therefore, the various embodiments proposed by the embodiments of the present invention are applicable to all other systems in which all signals are concentrated and the antenna/RF is extended by a broadband transmission line such as an optical fiber.
- FIG. 9 is a schematic flowchart diagram of another downlink baseband signal generating method according to an embodiment of the present invention.
- the downlink baseband signal generation method can be applied to OFDM-based frequency division multiple access or its similar technologies, such as a single carrier frequency division multiple access system, such as an LTE system, an LTE-A system, or a WiMAX system, to reduce C-RAN.
- Signal transmission bandwidth between the node and the RRU may include the following steps:
- the channel control and the modulation process are obtained.
- the downlink control channel signal is generated by the C-RAN node according to the physical layer control information, where the downlink control channel signal carries the transmission resource indication information, where the transmission resource indication information is used to indicate a subcarrier corresponding to the MIMO pre-coded signal and the downlink control channel signal respectively;
- the switching unit in the C-RAN node may exchange the downlink user code modulated signal and the downlink control channel signal of a certain cell to the corresponding RRU.
- the switching unit may exchange the downlink user code modulated signal and the downlink control channel signal of the certain cell to the corresponding RRU according to the preset switch configuration list.
- the foregoing switch configuration list is used to record the foregoing.
- the user information may be a parameter indicating the identity of the user, such as IMEI; and the RRU information may be an indication of the RRU.
- the switching unit in the C-RAN node may exchange the reference signal, the synchronization signal, and the broadcast channel signal of a certain cell to the corresponding RRU.
- the switching unit may exchange the reference signal, the synchronization signal, and the broadcast channel signal of the certain cell to the corresponding RRU according to the preset switch configuration list; where the foregoing switch configuration list is used to record the foregoing The correspondence between the user information of the cell and the corresponding RRU information.
- the RRU may map the MIMO pre-coded signal and the downlink control channel signal to corresponding subcarriers according to the transmission resource indication information carried in the downlink control channel signal sent by the C-RAN node.
- the transmission resource indication information is used to indicate a subcarrier corresponding to the MIMO pre-coded signal and the downlink control channel signal respectively;
- the RRU maps the reference signal, the synchronization signal, and the broadcast channel signal to corresponding subcarriers according to a preset mapping rule, where the mapping rule is used to indicate that the reference signal, the synchronization signal, and the broadcast channel signal respectively correspond to Subcarriers.
- the RRU can also receive the wireless connection as an optional implementation manner.
- a downlink user code modulated signal of another cell exchanged by the network access node; the foregoing transmission resource indication information is further used to indicate the subcarrier corresponding to the MIMO joint pre-coded signal and the downlink control channel signal respectively, so that The RRU maps the MIMO joint pre-coded signal and the downlink control channel signal to corresponding subcarriers according to the indication of the transmission resource indication information.
- the RRU may perform a multiple input multiple output combined precoding process on the downlink user code modulated signal of the above certain cell and the downlink user code modulated signal of the other cell, and combine the multi-input multiple-output combined pre-coded signal and
- the downlink control channel signal, the reference signal, the synchronization signal, and the broadcast channel signal are respectively mapped to corresponding subcarriers, and subjected to inverse fast Fourier transform processing to obtain a downlink baseband signal and transmit the downlink baseband signal.
- the RRU may also map the multiple input multiple output combined precoding processed signal and the downlink control channel signal of the certain cell to corresponding according to the transmission resource indication information carried in the downlink control channel signal of the certain cell.
- the embodiment of the present invention is not limited.
- the switching unit included in the radio access network node corresponds to multiple BBUs, that is, the switching unit corresponds to multiple cells, and when multiple cells adopt coordinated multi-point processing based on network multiple input and multiple output on the physical layer,
- the exchange list of multiple cells based on network multiple input multiple output coordinated multi-point processing may be preset on the exchange unit, and the exchange list is used for recording multi-input multi-point processing based on network multiple input multiple output on the physical layer.
- Table 1 The relationship between cells and corresponding RRUs is shown in Table 1.
- Table 1 shows that BBU1 and BBU2 use coordinated multi-point processing based on network multiple input and multiple output on the physical layer, where BBU1 and BBU2 correspond to RRU1.
- the switching unit included in the radio access network node receives the downlink user code modulated signal, the downlink control channel signal, the reference signal, the synchronization signal, and the broadcast channel signal output by the BBU1, the downlink user code modulated signal output by the BBU1 according to Table 1
- the downlink control channel signal, the reference signal, the synchronization signal, and the broadcast channel signal are exchanged to the RRU1; when the switching unit included in the radio access network node receives the downlink user code modulated signal, the downlink control channel signal, the reference signal, and the synchronization signal output by the BBU2
- the downlink user code modulated signal outputted by the BBU2 can be switched to the RRU1; the RRU1 can perform the multiple input multiple output combined precoding process on the downlink user code modulated signal of the BBU1 and
- BBU2 can be considered as the interference source of RRU1, and BBU1 and RRU1 are corresponding. BBU1 does not cause interference of RRU1. Therefore, after performing multiple input and multiple output joint precoding processing, The multiplexed multi-output combined pre-coded signal and the downlink control channel signal, the reference signal, the synchronization signal, and the broadcast channel signal of the BBU1 are respectively mapped to corresponding subcarriers, and subjected to inverse fast Fourier transform processing to obtain The downlink baseband signal is transmitted and sent out.
- the RRU receives a downlink user code modulated signal exchanged by the C-RAN node for performing MIMO precoding processing, and extracts a reference signal, a synchronization signal, a broadcast channel signal, and a MIMO from the C-RAN node.
- the pre-coded signal and the downlink control channel signal are respectively mapped onto corresponding subcarriers, and subjected to IFFT conversion processing to obtain a downlink baseband signal and transmitted.
- the embodiment of the invention does not need to transmit signals on the corresponding subcarriers between the C-RAN node and the RRU, and reduces the signal transmission bandwidth between the C-RAN node and the RRU.
- the embodiment of the present invention further provides a C-RAN node, which is used to implement the foregoing uplink baseband channel generation method in cooperation with the RRU.
- the C-RAN node can be applied to OFDM-based OFDM based on orthogonal frequency division multiple access or its similar technologies, such as a single carrier frequency division multiple access system, such as an LTE system, an LTE-A system, or a WiMAX system. Signal transmission bandwidth between the RRU and the RRU.
- FIG. 10 is a schematic structural diagram of a C-RAN node according to an embodiment of the present invention. As shown in FIG. 10, the C-RAN node may include:
- the BBU 1001 can include:
- the data channel coding and modulation module 10011 is configured to perform channel coding and modulation processing on the downlink data stream of the cell user, obtain a downlink user code modulation signal of the cell, and output the signal to the switching unit 1002;
- the downlink control channel generating module 10012 is configured to generate a downlink control channel signal according to the physical layer control information and output the signal to the switching unit 1002.
- the switching unit 1002 is configured to exchange the reference signal, the synchronization signal, the broadcast channel signal, and the downlink user code modulated signal and the downlink control channel signal of the foregoing cell to the corresponding RRU, so that the RRU performs the MIMO pre-processing on the downlink user code modulated signal. Encoding processing, and mapping the reference signal, the synchronization signal, the broadcast channel signal, the MIMO pre-coded signal, and the downlink control channel signal to corresponding subcarriers respectively, and performing IFFT conversion processing to obtain a downlink baseband signal and transmitting Go out.
- the switching unit 1002 is specifically configured to exchange the reference signal, the synchronization signal, the broadcast channel signal, and the downlink user code modulated signal and the downlink control channel signal of the foregoing cell to the corresponding RRU according to the preset switch configuration list;
- the exchange configuration list is used to record the correspondence between the user information and the corresponding RRU information.
- the switching unit 1002 is further configured to exchange downlink user code modulation signals of other cells to the foregoing.
- the corresponding RRU performs multi-input and multi-output joint pre-coding processing on the downlink user code modulated signal of the above cell and the downlink user code modulated signal of the other cell, and combines the multi-input and multi-output pre-programming
- the signal and the downlink control channel signal, the reference signal, the synchronization signal, and the broadcast channel signal of the foregoing cell are respectively mapped to corresponding subcarriers, and subjected to an IFFT inverse transform process to obtain a downlink baseband signal and transmit the downlink baseband signal.
- the data channel coding and modulation module 10011 after receiving the downlink data stream sent by the cell user, performs channel coding and modulation on the downlink data stream of the cell user to obtain a downlink user code modulated signal of the cell;
- the reference signal, the synchronization signal, the broadcast channel signal, and the downlink user code modulated signal and the downlink control channel signal are exchanged to the corresponding RRU, and the downlink user code modulated signal is subjected to MIMO precoding processing by the corresponding RRU, and the reference signal is synchronized.
- the signal, the broadcast channel signal, the MIMO pre-coded signal, and the downlink control channel signal are respectively mapped to corresponding subcarriers, and subjected to IFFT conversion processing to obtain a downlink baseband signal and transmitted.
- the MIMO precoding, the signal mapping, and the IFFT transform are forwarded to the RRU for processing, so that there is no need to transmit signals on the corresponding subcarriers between the C-RAN node and the RRU, and the C-RAN node and the RRU are reduced. Inter-signal transmission bandwidth.
- FIG. 11 is a schematic structural diagram of an RRU according to an embodiment of the present invention.
- the RRU may include:
- the precoding module 1101 is configured to receive a downlink user code modulated signal and a downlink control channel signal of a cell exchanged by the C-RAN node, and perform MIMO precoding processing on the downlink user code modulated signal;
- the downlink user code modulated signal of the foregoing cell is a C-RAN node receiving a certain
- the downlink data stream sent by the user of a cell is obtained by performing channel coding and modulation processing on the downlink data stream; and the downlink control channel signal is generated by the C-RAN node according to the physical layer control information.
- the resource mapping module 1102 is configured to receive a reference signal, a synchronization signal, and a broadcast channel signal of a certain cell exchanged by the C-RAN node, and perform the foregoing reference signal, the synchronization signal, the broadcast channel signal, and the foregoing precoding module 1101.
- the MIMO pre-coded signal and the downlink control channel signal are respectively mapped to corresponding subcarriers;
- the transform module 1103 is configured to perform an IFFT transform process on the signal mapped to the subcarrier to obtain a downlink baseband signal.
- the transceiver module 1104 is configured to send the downlink baseband signal.
- the resource mapping module 1102 may be specifically configured to receive a reference signal, a synchronization signal, and a broadcast channel signal of a certain cell exchanged by the C-RAN node, and use a reference signal of a certain cell according to a preset mapping rule. And the synchronization signal and the broadcast channel signal are respectively mapped to the corresponding subcarriers, where the mapping rule is used to indicate the subcarriers corresponding to the reference signal, the synchronization signal, and the broadcast channel signal respectively; and the transmission according to the C-RAN node
- the resource indication information maps the downlink user code modulated signal and the downlink control channel signal that are performed by the precoding module 1101 to the corresponding subcarriers, where the transmission resource indication information is carried in the downlink control channel signal. And a subcarrier corresponding to the MIMO precoding processed signal and the downlink control channel signal respectively.
- the precoding module 1101 is further configured to receive wireless. a downlink user code modulated signal of another cell exchanged by the access network node, and performing a multiple input multiple output combined precoding process on the downlink user code modulated signal of the other cell and the downlink user code modulated signal of the certain cell;
- the resource mapping module 1102 is further configured to map the multiplexed multi-output combined pre-coded signal and the downlink control channel signal, the reference signal, the synchronization signal, and the broadcast channel signal of the certain cell to corresponding sub-respectively On the carrier
- the foregoing resource mapping module 1102 may also be based on the foregoing.
- the transmission resource indication information carried in the downlink control channel signal of a cell, the multi-input and multi-output joint pre-processed signal and the downlink control channel signal of the certain cell are respectively mapped to corresponding subcarriers, Not limited.
- the foregoing transform module 1103 is configured to perform an IFFT transform process on the signal mapped to the subcarrier to obtain a downlink baseband signal.
- the transceiver module 1104 is configured to send the downlink baseband signal.
- the precoding module 1101 performs MIMO precoding processing on the downlink user code modulated signal of a certain cell exchanged by the C-RAN node
- the resource mapping module 1102 refers to a certain cell exchanged by the C-RAN node.
- the signal, the synchronization signal, the broadcast channel signal, and the MIMO pre-coded signal, and the downlink control channel signal of a certain cell are respectively mapped to corresponding subcarriers
- the transform module 1103 performs IFFT conversion processing to obtain a downlink baseband signal and transmits and receives the downlink baseband signal.
- the machine module 1104 sends out.
- the MIMO precoding, the signal mapping, and the IFFT transform processing are forwarded to the RRU for processing, so that there is no need to transmit signals on the corresponding subcarriers between the C-RAN node and the RRU, and the C-RAN node and the RRU are reduced. Signal transmission bandwidth between.
- FIG. 12 is a schematic structural diagram of a downlink baseband signal generating system according to an embodiment of the present invention. As shown in Figure 12, the system can include:
- the C-RAN node 1201 is configured to perform channel coding and modulation processing on a downlink data stream of a certain cell user, obtain a downlink user code modulation signal of a certain cell, and generate a downlink control channel signal of the cell according to the physical layer control information. And switching a reference signal, a synchronization signal, a broadcast channel signal, and a downlink user code modulated signal and a downlink control channel signal of a certain cell to the RRU 1202;
- the RRU 1202 is configured to receive a downlink user code modulated signal and a downlink control channel signal of a cell exchanged by the C-RAN node 1201, perform MIMO precoding processing on a certain cell downlink user code modulated signal, and receive the C-RAN node. 1201 exchanges a certain cell reference signal, synchronization signal and broadcast channel signal, and maps a certain cell reference signal, synchronization signal, broadcast channel signal, MIMO pre-coded signal, and a certain cell downlink control channel signal The signal is transmitted to the corresponding subcarrier, and the IFFT conversion process is performed to obtain the downlink baseband signal and transmit it.
- the RRU 1202 is further configured to receive a C-RAN node.
- the downlink user code modulated signal of the other cells exchanged by the 1201, and the downlink user code modulated signal of the other cell and the downlink user code modulated signal of the certain cell are subjected to multiple input multiple output combined precoding processing, and the multiple input multiple output is performed.
- the combined pre-coded signal and the downlink control channel signal, the reference signal, the synchronization signal, and the broadcast channel signal of the above-mentioned cell are respectively mapped to corresponding subcarriers, and subjected to IFFT inverse transform processing to obtain a downlink baseband signal and transmitted. .
- the C-RAN node 1201 may be connected to multiple RRUs 1202 through an optical fiber or an optical transmission network, where the structure of the C-RAN node 1201 may be the same as that of FIG. 10, and each RRU The structure of the 1202 can be the same as that of FIG. 11, so that the downlink baseband signal generating system provided by the embodiment of the present invention can also be as shown in FIG.
- the functions of the various functional modules in FIG. 13 have been described in detail in the foregoing embodiments, and are not described in this embodiment.
- the C-RAN node 1201 after receiving the downlink data stream sent by the user, performs channel coding and modulation on the downlink data stream of the user to obtain a downlink user code modulated signal; and uses a reference signal, a synchronization signal, and a broadcast channel.
- the signal and the downlink user code modulated signal and the downlink control channel signal are exchanged to the corresponding RRU 1202, and the downlink user code modulated signal is subjected to MIMO precoding processing by the RRU 1202, and the reference signal, the synchronization signal, the broadcast channel signal, and the MIMO precoding process are processed.
- the downlink signal and the downlink control channel signal are respectively mapped to corresponding subcarriers, and subjected to IFFT conversion processing to obtain a downlink baseband signal and transmitted.
- the MIMO precoding, the signal mapping, and the IFFT transform processing are forwarded to the RRU 1202, so that there is no need to transmit signals on the corresponding subcarriers between the C-RAN node 1201 and the RRU 1202, and the C-RAN node is lowered. Signal transmission bandwidth between the RRU and the RRU.
- the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
- the foregoing storage device includes the following steps:
- the foregoing storage medium includes: a USB flash drive, a read-only memory (ROM), and a random access device ( Random Access Memory, RAM), disk or disc, etc.
- Various media that can store program code are described.
- the description of the above embodiment is only for helping to understand the method and core idea of the present invention. Meanwhile, for those skilled in the art.
- the present invention is not limited by the scope of the present invention.
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Description
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Priority Applications (4)
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BR112012033705-0A BR112012033705B1 (pt) | 2010-12-21 | 2011-08-25 | Método de geração de sinal de banda base de enlace descendente, nó de rede de acesso por rádio de nuvem, unidade remota de rádio de rede de acesso por rádio de nuvem e sistema de geração de sinal de banda base de enlace descendente |
EP11851653.3A EP2574138B1 (en) | 2010-12-21 | 2011-08-25 | Method for generating downlink baseband signal and related device |
US13/711,541 US8705483B2 (en) | 2010-12-21 | 2012-12-11 | Downlink baseband signal generating method, relevant device and system |
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US8705483B2 (en) | 2014-04-22 |
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