WO2018171624A1 - Procédé et appareil de transmission de données - Google Patents

Procédé et appareil de transmission de données Download PDF

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Publication number
WO2018171624A1
WO2018171624A1 PCT/CN2018/079806 CN2018079806W WO2018171624A1 WO 2018171624 A1 WO2018171624 A1 WO 2018171624A1 CN 2018079806 W CN2018079806 W CN 2018079806W WO 2018171624 A1 WO2018171624 A1 WO 2018171624A1
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Prior art keywords
demodulation reference
reference signal
mapping relationship
transmission scheme
precoding
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PCT/CN2018/079806
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English (en)
Chinese (zh)
Inventor
吴晔
毕晓艳
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华为技术有限公司
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Publication of WO2018171624A1 publication Critical patent/WO2018171624A1/fr

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting

Definitions

  • the present application relates to the field of communications and, more particularly, to a method and apparatus for data transmission.
  • MIMO Multiple-input multiple-output
  • multi-user multiple-input multiple-output (MU-MIMO) technology can support different time-frequency resources between network devices and different terminal devices to transmit different data streams.
  • MU-MIMO multi-user multiple-input multiple-output
  • the terminal device is able to learn the transmission schemes and demodulation reference signals of other terminal devices. For example, it is advantageous to reduce the complexity of interference estimation and demodulation.
  • the terminal device can only guess the demodulation reference signal and transmission scheme used by other terminal devices to transmit data. This means that when the terminal device performs interference estimation, it needs to traverse all demodulation reference signal ports of the cell that are not used to transmit data to the terminal device, and all demodulation reference signal ports of the neighboring cells, and try various possible transmissions.
  • the scheme performs interference channel estimation and data demodulation, which greatly increases the complexity of terminal equipment interference estimation and demodulation.
  • the present application provides a method and apparatus for data transmission, which can predetermine the correspondence between the resources of the demodulation reference signal and the transmission scheme, so that the receiving end device can learn the transmission schemes of other receiving end devices.
  • a method for data transmission comprising:
  • the transmitting device pre-codes the demodulation reference signal to obtain a pre-coded demodulation reference signal, and the resource of the demodulation reference signal is associated with a transmission scheme of the data stream corresponding to the demodulation reference signal;
  • the transmitting end device sends the precoding demodulation reference signal to the receiving end device.
  • the receiving end device can determine the transmission scheme of the corresponding data stream according to the received demodulation reference signal. Therefore, when the interference signal is received, the interference estimation can be performed according to the demodulation reference signal and the transmission scheme, and the method of traversing the different transmission schemes on all unused ports used in the prior art is compared, The complexity of interference estimation and demodulation of the receiving device is greatly reduced, and the delay caused by data processing is reduced.
  • a method for data transmission comprising:
  • the transmitting end device pre-codes the demodulation reference signal to obtain a pre-coding demodulation reference signal, where the demodulation reference signal corresponds to the data stream, and the resource of the demodulation reference signal is determined according to the transmission scheme of the data stream;
  • the precoding demodulation reference signal is transmitted to the receiving device.
  • the receiving end device can determine the transmission scheme of the corresponding data stream according to the received demodulation reference signal. Therefore, when the interference signal is received, the interference estimation can be performed according to the demodulation reference signal and the transmission scheme, and the method of traversing the different transmission schemes on all unused ports used in the prior art is compared, The complexity of interference estimation and demodulation of the receiving device is greatly reduced, and the delay caused by data processing is reduced.
  • the resource of the demodulation reference signal is associated with the transmission scheme, and the resource of the demodulation reference signal is directly associated with the transmission scheme, that is, correspondingly, or the resource of the demodulation reference signal and the transmission scheme are indirectly Association.
  • the resource of the demodulation reference signal is determined according to a pre-defined first mapping relationship and a transmission scheme of the data stream, where the first mapping relationship is used to indicate resources of multiple demodulation reference signals and at least A correspondence between transmission schemes.
  • the first mapping relationship may be statically configured and stored in advance on the transmitting device and the receiving device.
  • the resource of the demodulation reference signal is associated with the transmission scheme, and the resource of the demodulation reference signal is directly associated with the transmission scheme, that is, correspondingly, or the resource of the demodulation reference signal and the transmission scheme are indirectly Association.
  • the method before the sending end device pre-codes the demodulation reference signal, the method further includes:
  • the first mapping relationship is determined by the network device according to the pre-defined mapping rule and the resource of the demodulation reference signal required by the currently configured transmission scheme, where the first mapping relationship is used by the network device.
  • the first mapping relationship is used by the network device.
  • the resource of the demodulation reference signal is determined according to a transmission scheme of the data stream and the first mapping relationship. That is, the first mapping relationship may be dynamically or semi-statically configured by the network device, and sent to the terminal device, so that the network device functions as the transmitting device, the terminal device serves as the receiving device, or the terminal device functions as the transmitting device and the network device. In the case of the receiving device, both parties can learn the first mapping relationship.
  • the network device sends the indication information of the first mapping relationship to the terminal device.
  • the transmission scheme may correspond to at least one mapping relationship.
  • the transmission scheme may be: spatial frequency block code (SFBC), precoder cycling, or space division multiplexing (for example, , closed loop spatial multiplexing (CLSM), etc.
  • SFBC spatial frequency block code
  • CLSM closed loop spatial multiplexing
  • the mapping rule may separately set a resource of a corresponding demodulation reference signal for each transmission scheme, or may also set a resource of a corresponding demodulation reference signal only for a part of the transmission scheme, for example, when the transmission scheme includes SFBC.
  • the resources of the corresponding demodulation reference signals may be separately set for each transmission scheme, or the corresponding demodulation reference signals may be respectively set for the two transmission schemes of SFBC and precoding polling. There is no need to set a corresponding demodulation reference signal for the CLSM.
  • the network device can preferentially configure the resources of the demodulation reference signal for the two transmission schemes of SFBC and precoding polling, and then configure the resources of the demodulation reference signal for the CLSM. That is, the SFBC and precoding polls are directly associated with the resources of the demodulation reference signal, while the CLSM is indirectly associated with the resources of the demodulation reference signal.
  • the receiving end device cannot accurately determine the transmission scheme of the data stream corresponding to each demodulation reference signal directly according to the first mapping relationship, it is compared to all unused ports used in the prior art.
  • the method of traversing to try different transmission schemes reduces the range of blind detection, reduces the complexity of interference estimation and demodulation of the receiving device to a certain extent, and reduces the delay caused by data processing.
  • a method for data transmission comprising:
  • a precoding demodulation reference signal where the precoding demodulation reference signal is obtained by precoding the demodulation reference signal by the transmitting end device, the resource of the demodulation reference signal and the demodulation reference signal Corresponding data stream transmission scheme is associated;
  • the receiving end device demodulates the data stream according to the precoding demodulation reference signal.
  • a method for data transmission comprising:
  • the receiving end device monitors at least one precoding demodulation reference signal that is not allocated to itself, and the at least one precoding demodulation reference signal is obtained by the transmitting end device precoding the at least one demodulation reference signal, and each solution is obtained. Adjusting the reference signal to correspond to a data stream;
  • the receiving end device determines a transmission scheme corresponding to the at least one precoding demodulation reference signal based on an association relationship between a resource of the demodulation reference signal and a transmission scheme.
  • the receiving end device can determine the transmission scheme of the corresponding data stream according to the received demodulation reference signal. Therefore, when the interference signal is received, the interference estimation can be performed according to the demodulation reference signal and the transmission scheme, which greatly reduces the complexity of the interference estimation and demodulation of the receiving device, and reduces the delay caused by the data processing.
  • the resource of the demodulation reference signal is associated with the transmission scheme, and the resource of the demodulation reference signal is directly associated with the transmission scheme, that is, correspondingly, or the resource of the demodulation reference signal and the transmission scheme are indirectly Association.
  • the method further includes:
  • the receiving end device determines, according to the at least one precoding demodulation reference signal and the corresponding transmission scheme, a channel matrix corresponding to the at least one precoding demodulation reference signal.
  • the association relationship between the resource of the demodulation reference signal and the transmission scheme includes a first mapping relationship, where the first mapping relationship is used to indicate resources of multiple demodulation reference signals and at least one transmission scheme.
  • the receiving end device determines, according to the predefined first mapping relationship, a transmission scheme corresponding to the resource of the precoding demodulation reference signal as a transmission scheme of the data stream.
  • the first mapping relationship may be statically configured and stored in advance on the transmitting device and the receiving device.
  • the association relationship between the resource of the demodulation reference signal and the transmission scheme includes a first mapping relationship, where the first mapping relationship is used to indicate resources of multiple demodulation reference signals and at least one transmission scheme.
  • the receiving end device acquires the first mapping relationship, where the first mapping relationship is determined according to a pre-defined mapping rule and a resource of a demodulation reference signal required by a currently configured transmission scheme;
  • the receiving end device determines, according to the first mapping relationship and the resource of the precoding demodulation reference signal, a transmission scheme of the data stream.
  • the first mapping relationship may be dynamically or semi-statically configured by the network device, and sent to the terminal device, so that the network device functions as the transmitting device, the terminal device serves as the receiving device, or the terminal device functions as the transmitting device and the network device. In the case of the receiving device, both parties can learn the first mapping relationship.
  • the transmission scheme may correspond to at least one mapping relationship.
  • the transmission scheme may be: a spatial frequency block code (SFBC), a precoding polling, or a space division multiplexing.
  • SFBC spatial frequency block code
  • the mapping rule may separately set a resource of a corresponding demodulation reference signal for each transmission scheme, or may also set a resource of a corresponding demodulation reference signal only for a part of the transmission scheme, for example, when the transmission scheme includes SFBC.
  • the resources of the corresponding demodulation reference signals may be separately set for each transmission scheme, or the corresponding demodulation reference signals may be respectively set for the two transmission schemes of SFBC and precoding polling. There is no need to set a corresponding demodulation reference signal for the CLSM.
  • the network device can preferentially configure the resources of the demodulation reference signal for the two transmission schemes of SFBC and precoding polling, and then configure the resources of the demodulation reference signal for the CLSM. That is, the SFBC and precoding polling are directly related to the resources of the demodulation reference signal, and the CLSM is indirectly associated with the resources of the demodulation reference signal.
  • the receiving end device cannot accurately determine the transmission scheme of the data stream corresponding to each demodulation reference signal directly according to the first mapping relationship, it is compared to all unused ports used in the prior art.
  • the method of traversing to try different transmission schemes reduces the range of blind detection, reduces the complexity of interference estimation and demodulation of the receiving device to a certain extent, and reduces the delay caused by data processing.
  • a fifth aspect provides a method for data transmission, including:
  • the network device Determining, by the network device, a first mapping relationship according to a predefined mapping rule and a resource of the demodulation reference signal required by the currently configured transmission scheme, where the first mapping relationship is used to indicate resources of the multiple demodulation reference signals and at least one Corresponding relationship of transmission schemes;
  • the network device sends the indication information of the first mapping relationship to the terminal device.
  • the sending the indication information of the first mapping relationship to the terminal device including:
  • the network device sends a radio resource control RRC message to the terminal device, where the RRC message carries the indication information of the first mapping relationship.
  • the sending the indication information of the first mapping relationship to the terminal device including:
  • the network device sends a media access control MAC-control cell CE to the terminal device, where the MAC-CE carries the indication information of the first mapping relationship.
  • the sending the indication information of the first mapping relationship to the terminal device including:
  • the network device sends the downlink control information DCI to the terminal device, where the DCI carries the indication information of the first mapping relationship.
  • the dynamic or semi-static configuration of the first mapping relationship is implemented by carrying the indication information of the first mapping relationship in any one of the signalings.
  • a method for data transmission comprising:
  • the terminal device Receiving, by the terminal device, the indication information of the first mapping relationship that is sent by the network device, where the first mapping relationship is used to indicate a correspondence between the plurality of demodulation reference signals and the at least one transmission scheme;
  • the terminal device receives the indication information of the first mapping relationship that is sent by the network device, and includes:
  • the terminal device receives a radio resource control RRC message sent by the network device, where the RRC message carries the indication information of the first mapping relationship.
  • the terminal device receives the indication information of the first mapping relationship that is sent by the network device, and includes:
  • the terminal device receives the media access control MAC-control cell CE sent by the network device, where the MAC-CE carries the indication information of the first mapping relationship.
  • the terminal device receives the indication information of the first mapping relationship that is sent by the network device, and includes:
  • the terminal device receives the downlink control information DCI sent by the network device, where the DCI carries the indication information of the first mapping relationship.
  • the dynamic or semi-static configuration of the first mapping relationship is implemented by carrying the indication information of the first mapping relationship in any one of the signalings.
  • an apparatus for data transmission comprising a method for performing data transmission in any of the possible implementations of the first to sixth aspects or the first to sixth aspects Each module.
  • the foregoing apparatus for data transmission is a network device.
  • the foregoing apparatus for data transmission is a terminal device.
  • an apparatus for data transmission comprising a processor and a memory.
  • the memory is for storing a computer program for calling and running the computer program from the memory, such that the apparatus for data transmission performs any of the first to sixth aspects or any of the first to sixth aspects.
  • the method in .
  • the foregoing apparatus for data transmission is a network device.
  • the foregoing apparatus for data transmission is a terminal device.
  • a computer program product comprising: computer program code, when the computer program code is operated by a device for data transmission, causing the device for data transmission to perform the above.
  • a tenth aspect a computer readable medium storing program code, the program code comprising for performing any of the first to sixth aspects or the first to sixth aspects An instruction of a method in a possible implementation.
  • a processing apparatus comprising a processor and an interface.
  • the processor is operative to perform the method of any one of the first aspect to the sixth aspect or the first aspect to the sixth aspect, wherein the related data interaction (eg, performing or receiving data transmission) is The above interface is used to complete.
  • the foregoing interface may further complete the data interaction process by using a transceiver.
  • the processing device in the eleventh aspect may be a chip, and the processor may be implemented by using hardware or by software.
  • the processor may be a logic circuit, an integrated circuit, or the like;
  • the processor can be a general purpose processor implemented by reading software code stored in a memory that can be integrated into the processor and can be external to the processor.
  • the resource of the demodulation reference signal includes at least one of the following: a port, a scrambling code, an orthogonal code, and an orthogonal sequence.
  • the resources of the demodulation reference signal include: a port and/or a scrambling code.
  • the resources of the demodulation reference signal include: an orthogonal code or an orthogonal sequence.
  • the port number may indicate an orthogonal code and a time-frequency resource.
  • the mapping rule includes: mapping the index number of the resource of the at least one demodulation reference signal to the index number of the demodulation reference signal from the smallest to the largest, starting from a specific index number a transmission scheme,
  • the index number of the resource of the demodulation reference signal includes: a port number of the demodulation reference signal, an index number (n SCID ) of the scrambling code identifier of the demodulation reference signal, and the demodulation reference signal An index of the orthogonal code, or an index number of the orthogonal sequence of the demodulation reference signal.
  • an index number can be understood as an identifier for identifying an attribute, for example, an index of an orthogonal code, which may also be called an identifier of an orthogonal code, an index of an orthogonal sequence, or an orthogonal sequence.
  • an index number can be understood as an identifier for identifying an attribute, for example, an index of an orthogonal code, which may also be called an identifier of an orthogonal code, an index of an orthogonal sequence, or an orthogonal sequence.
  • FIG. 1 is a schematic diagram of a communication system suitable for a method and apparatus for data transmission in accordance with an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a downlink physical channel processing procedure used in an existing LTE system.
  • FIG. 3 is a schematic flowchart of a method for data transmission provided by an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a correspondence between port numbers of multiple demodulation reference signals and at least one transmission scheme according to an embodiment of the present invention.
  • FIG. 5 is another schematic diagram of a correspondence between port numbers of multiple demodulation reference signals and at least one transmission scheme according to an embodiment of the present invention.
  • FIG. 6 is another schematic diagram of a correspondence between port numbers of multiple demodulation reference signals and at least one transmission scheme according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a correspondence between an index number of a scrambling code identifier of a plurality of demodulation reference signals and at least one transmission scheme according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a port number of a plurality of demodulation reference signals, an index number of a scrambling code identifier, and a correspondence relationship between at least one transmission scheme according to an embodiment of the present invention.
  • Figure 9 shows a schematic diagram of precoding different REs in the same RB.
  • Figure 10 is a schematic diagram of a communication system suitable for use in a method of data transmission in accordance with another embodiment of the present invention.
  • FIG. 11 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention.
  • FIG. 12 is a schematic diagram of a correspondence between an index number of an orthogonal sequence of a plurality of demodulation reference signals and at least one transmission scheme according to an embodiment of the present invention.
  • FIG. 13 is a schematic diagram of correspondence between port numbers of multiple demodulation reference signals, index numbers of orthogonal sequences, and at least one transmission scheme according to an embodiment of the present invention.
  • FIG. 14 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention.
  • FIG. 15 is a schematic block diagram of an apparatus for data transmission according to an embodiment of the present invention.
  • FIG. 16 is a schematic block diagram of an apparatus for data transmission according to another embodiment of the present invention.
  • FIG. 17 is a schematic block diagram of an apparatus for data transmission according to another embodiment of the present invention.
  • FIG. 18 is a schematic block diagram of an apparatus for data transmission according to another embodiment of the present invention.
  • FIG. 19 is a schematic block diagram of an apparatus for data transmission according to an embodiment of the present invention.
  • FIG. 1 shows a schematic diagram of a communication system suitable for a method and apparatus for data transmission in accordance with an embodiment of the present invention.
  • the communication system 100 includes a network device 102 that can include multiple antennas, such as antennas 104, 106, 108, 110, 112, and 114. Additionally, network device 102 may additionally include a transmitter chain and a receiver chain, as will be understood by those of ordinary skill in the art, which may include multiple components related to signal transmission and reception (eg, processor, modulator, multiplexer) , demodulator, demultiplexer or antenna, etc.).
  • the network device 102 may be a global system of mobile communication (GSM) or a base station (Base Transceiver Station (BTS) in Code Division Multiple Access (CDMA), or may be a broadband code division.
  • the base station (NodeB, NB) in the Wideband Code Division Multiple Access (WCDMA) may also be an evolved base station (Evolutional Node B, eNB or eNodeB) in a Long Term Evolution (LTE), or a relay station, Access point or Remote Radio Unit (RRU), or in-vehicle devices, wearable devices, and network-side devices in future fifth-generation (5G) networks, such as transmission points (Transmission Reception Point)
  • 5G fifth-generation
  • the TRP, the base station, the small base station device, and the like are not particularly limited in the embodiment of the present invention.
  • Network device 102 can communicate with a plurality of terminal devices, such as terminal device 116 and terminal device 122.
  • Network device 102 can communicate with any number of terminal devices similar to terminal device 116 or 122.
  • the terminal device 116 or 122 may also be referred to as a User Equipment (UE) user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, and a user terminal. , terminal, wireless communication device, user agent or user device.
  • UE User Equipment
  • the terminal device may be a station (station, ST) in a wireless local area network (WLAN), and may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, or a wireless local loop (wireless local Loop, WLL) station, personal digital assistant (PDA) device, handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, in-vehicle device, wearable device, and next-generation communication system,
  • PDA personal digital assistant
  • the terminal device in the 5G network or the terminal device in the public land mobile network (PLMN) network in the future is not limited in this embodiment of the present invention.
  • terminal device 116 is in communication with antennas 112 and 114, wherein antennas 112 and 114 transmit information to terminal device 116 over forward link 118 and receive information from terminal device 116 over reverse link 120.
  • terminal device 122 is in communication with antennas 104 and 106, wherein antennas 104 and 106 transmit information to terminal device 122 over forward link 124 and receive information from terminal device 122 over reverse link 126.
  • the forward link 118 can utilize a different frequency band than that used by the reverse link 120, and the forward link 124 can utilize the reverse link. 126 different frequency bands used.
  • FDD frequency division duplex
  • the forward link 118 and the reverse link 120 can use a common frequency band, a forward link 124, and a reverse link.
  • Link 126 can use a common frequency band.
  • Each antenna (or set of antennas consisting of multiple antennas) and/or regions designed for communication is referred to as a sector of network device 102.
  • the antenna group can be designed to communicate with terminal devices in sectors of the network device 102 coverage area.
  • the transmit antennas of network device 102 may utilize beamforming to improve the signal to noise ratio of forward links 118 and 124.
  • the network device 102 uses beamforming to transmit signals to the randomly dispersed terminal devices 116 and 122 in the relevant coverage area, the network device 102 uses a single antenna to transmit signals to all of its terminal devices. Mobile devices are subject to less interference.
  • Network device 102, terminal device 116 or terminal device 122 may be a wireless communication transmitting device and/or a wireless communication receiving device.
  • the wireless communication transmitting device can encode the data for transmission.
  • the wireless communication transmitting device may acquire (eg, generate, receive from other communication devices, or store in memory, etc.) a certain number of data bits to be transmitted over the channel to the wireless communication receiving device.
  • Such data bits may be included in a transport block (or multiple transport blocks) of data that may be segmented to produce multiple code blocks.
  • the communication system 100 may be a public land mobile network (PLMN) network or a device to device (D2D) network or a machine to machine (M2M) network or other network, and FIG. 1 is only for easy understanding.
  • PLMN public land mobile network
  • D2D device to device
  • M2M machine to machine
  • FIG. 1 is only for easy understanding.
  • other network devices may also be included in the network, which are not shown in FIG.
  • the sending end device is a network device, and the receiving end device is a terminal device; or the sending end device is a terminal device, and the receiving end device is a network device.
  • the description is made by taking the transmitting device as the network device and the receiving device as the terminal device.
  • the network device can transmit data with the at least one terminal device through the same time-frequency resource.
  • the processing object of the downlink physical channel processing is a codeword, and the codeword is usually a bitstream that is encoded (including at least channel coding).
  • the code word is scrambling to generate a scrambled bit stream.
  • the scrambled bit stream is subjected to modulation mapping to obtain a stream of modulation symbols.
  • the modulation symbol stream is mapped to multiple symbol layers (also called spatial streams, spatial layers) through layer mapping.
  • the symbol layer is precoded to obtain a plurality of precoded symbol streams.
  • the precoded symbol stream is mapped through a resource element (RE) and mapped onto multiple REs. These REs are then subjected to orthogonal frequency division multiplexing (OFDM) modulation to generate an OFDM symbol stream.
  • the OFDM symbol stream is then transmitted through an antenna port.
  • OFDM orthogonal frequency division multiplexing
  • Space division multiplexing means that the same frequency band is reused in different spaces.
  • Space division multiplexing can achieve spatial segmentation by, for example, employing adaptive array antennas, forming different beams in different user directions, each beam providing a unique channel without other user interference.
  • Multiple terminals can transmit using the same time-frequency resources at the same time. This can greatly improve spectrum utilization and system data throughput.
  • Precoding is an important technology for implementing space division multiplexing.
  • the precoding technique may be that, in the case of a known channel state, the signal to be transmitted is processed by a pre-processing of the signal at the transmitting end, that is, by means of a precoding matrix matched with the channel resource, so that the precoding is performed.
  • the signal to be transmitted is adapted to the channel, so that the complexity of eliminating the influence between channels at the receiving end is reduced. Therefore, the received signal quality (for example, Signal to Interference plus Noise Ratio, SINR) is improved by precoding processing of the transmitted signal. Therefore, by using the precoding technology, the transmitting end device and the multiple receiving end devices can be transmitted on the same time-frequency resource, that is, MU-MIMO is implemented.
  • precoding refers to precoding for implementing space division multiplexing.
  • precodings referred to herein may be described more generally if not specifically stated or if they do not contradict the actual or internal logic in the related description. Precoding for space division multiplexing.
  • Transmit diversity improves transmission reliability by obtaining redundant transmission of original signals (eg, symbols) over time, frequency, space (eg, antenna), or various combinations of the above three dimensions to achieve diversity gain.
  • transmit diversity includes, for example, but not limited to, space-time transmit diversity (STTD), space-frequency transmit diversity (SFTD), and spatial frequency block code (SFBC).
  • STTD space-time transmit diversity
  • SFTD space-frequency transmit diversity
  • SFBC spatial frequency block code
  • STBC space time block code
  • TSTD time switched transmit diversity
  • FSTD frequency switch transmit diversity
  • OTD orthogonal diversity
  • CDD cyclic delay diversity
  • Layer shifting Diversity methods such as cyclic delay diversity (CDD) and layer shifting, and the diversity methods obtained by deriving, evolving, and combining the various diversity methods described above, and based on the diversity transmission methods listed above.
  • Space division multiplexing space-time transmit diversity
  • SFTD space-frequency transmit diversity
  • SFBC spatial frequency block code
  • STBC space time block code
  • TSTD time switched transmit diversity
  • FSTD frequency switch transmit diversity
  • OTD orthogonal diversity
  • CDD cyclic delay diversity
  • layer shifting diversity methods obtained by deriving, evolving, and
  • MU-MIMO only supports that the transmitting device and the multiple receiving devices use the same time-frequency resource and the same transmission scheme (or transmission scheme) to transmit data.
  • the transmission scheme mentioned herein may be a transmission scheme defined in an existing protocol (for example, the LTE protocol), or may be a transmission scheme defined in a related protocol in the future 5G, and the present invention is not particularly limited. It should be understood that the transmission scheme can be understood as a term used to indicate the technical solution used to transmit data, and should not be construed as limiting the invention, and the invention does not exclude the possibility of replacing the transmission scheme by other names in future protocols.
  • the network device uses closed loop spatial multiplexing (CLSM) to simultaneously transmit data to multiple terminal devices.
  • CLSM closed loop spatial multiplexing
  • the channel environment is also different.
  • the signal quality of the received signal may be better with the transmission scheme of the CLSM.
  • the received signal quality is poor, which may need to be adopted.
  • the diversity is transmitted to obtain the diversity gain.
  • the network device 102 in downlink transmission, can transmit data with the terminal device 116 based on the transmission scheme of the CLSM, and at the same time, can perform data transmission to the terminal device 122 based on the transmit diversity technology.
  • the pre-processing is performed, and then the collected data is sent to the terminal device 122 by means of space division multiplexing.
  • the terminal device e.g., the terminal device 116 cannot know the transmission scheme of the other terminal device (e.g., the terminal device 122).
  • the terminal device it is often advantageous for the terminal device to know the transmission scheme of the other terminal device and the port of the demodulation reference signal (DMRS). For example, the complexity of terminal device interference estimation can be greatly reduced.
  • DMRS demodulation reference signal
  • the network device 102 simultaneously transmits data to the terminal device 116 and the terminal device 122, it is assumed that the communication system supports up to eight DMRS ports (for example, port#0 to port#7). transmission.
  • the network device 102 transmits the data #A to the terminal device 116 through port #0 and port #1, and transmits the data #B to the terminal device 122 through port #3. While the terminal device 116 and the terminal device 122 receive data, they may receive the data #A and the data #B, respectively.
  • the terminal device 116 is the target terminal device, it is necessary for the terminal device 116 to eliminate the interference generated by the data #B, so that the data #A with better signal quality can be obtained, so the terminal device 122 and the network device 102 transmit the DMRS.
  • the pilot channel and the data channel of the transmitted data constitute the interference channel of the terminal device 116.
  • the terminal device 116 and the network device 102 transmit the pilot channel of the DMRS and the data channel of the transmission data to constitute the interference channel of the terminal device 122.
  • the DMRS is defined by the DMRS port, or is defined by the DMRS resource.
  • Each DMRS can correspond to one port.
  • the DMRS as a reference signal for demodulating data is merely exemplary and should not be construed as limiting the embodiments of the present invention.
  • the present application does not exclude the use of other names in existing or future protocols. Instead of DMRS to achieve its same function.
  • the terminal device 116 since the terminal device 116 is not able to know the transmission scheme of the data #B and the demodulation reference signal port, the terminal device 116 can only blindly assume the transmission scheme of the interference port, that is, in addition to being sent to itself. Attempts to receive the demodulation reference signal on each port and to traverse various possible transmission schemes on the port receiving the demodulation reference signal to estimate the interference channel may be referred to as blind detection.
  • the terminal device 116 may attempt to receive the DMRS transmitted by the network device 102 to the terminal device 122 on the remaining six ports except port #0 and port #1, and in the case where the DMRS is received, in various possible A transmission scheme is assumed in the transmission scheme to estimate the channel matrix of the interference channel, and then the interference noise covariance matrix is obtained according to the channel matrix of the interference channel, and the received signal is processed by the receiving algorithm. For example, a received signal is processed using a minimum mean square error (MMSE)-interference rejection combining (IRC) reception algorithm to attempt to demodulate data #A. If the demodulation is unsuccessful, you will need to try another transmission scheme again.
  • MMSE minimum mean square error
  • IRC interference rejection combining
  • the channel matrix estimated according to the precoding demodulation reference signal is an equivalent channel matrix, and in the embodiment of the present invention, In the case of special description, the channel matrix refers to the equivalent channel matrix.
  • the channel matrix of the interference channel can be estimated according to the precoding vector of the DMRS, but if the transmission is unknown
  • the interference estimation obtained by directly calculating the interference noise covariance matrix according to the channel matrix estimated by each DMRS is low, and finally the demodulated first data stream is wrong, and the interference estimation needs to be performed again.
  • the terminal device 116 may also receive interference from the neighboring cell, and needs to perform interference estimation on the interference channel of the neighboring cell, which further increases the complexity of the interference estimation.
  • the terminal device 116 cannot know the transmission scheme and the DMRS port of the terminal device 122, the complexity of interference estimation and data demodulation will be greatly increased, which is also a huge challenge for the terminal device 116. At the same time, the delay caused by data transmission will be relatively large.
  • the number of DMRS ports may also be more or less.
  • the more the number of DMRS ports the higher the complexity of interference estimation and data demodulation.
  • the present application provides a method for data transmission, which can pre-define the correspondence between a DMRS port and a transmission scheme, so that the receiving end device can know in advance the DMRS port and transmission scheme of other receiving terminals.
  • FIG. 3 is a schematic flow diagram of a method 300 for data transmission in accordance with an embodiment of the present invention as seen from the perspective of device interaction. It should be understood that FIG. 3 illustrates communication steps or operations of the method for data transmission according to an embodiment of the present invention, but the steps or operations are merely examples, and other operations in the embodiment of the present invention or various components in FIG. 3 may be performed. The deformation of the operation. Moreover, the various steps in FIG. 3 may be performed in a different order than that presented in FIG. 3, and it is possible that not all operations in FIG. 3 are to be performed.
  • first and second are used only to distinguish different objects, and should not be construed as limiting the embodiments of the present invention. For example, it is used to distinguish different terminal devices, different spatial streams, different demodulation reference signals, and the like.
  • the method 300 includes:
  • the network device acquires a first mapping relationship, where the first mapping relationship is used for a correspondence between resources of multiple demodulation reference signals and at least one transmission scheme.
  • the first mapping relationship may be pre-defined by each network device and each terminal device, that is, may be statically configured.
  • the first mapping relationship may be pre-stored in the memory of each network device and each terminal device, so that the network device and the terminal device directly acquire from the memory when needed.
  • the correspondence between the port number of the demodulation reference signal and the transmission scheme is fixed after being determined.
  • the first mapping relationship can be as shown in any one of FIGS. 4 to 8.
  • the first mapping relationship may also be determined according to a currently configured transmission scheme, that is, may be dynamically configured or semi-statically configured.
  • S302 specifically includes:
  • the network device determines the first mapping relationship according to a predefined mapping rule and a resource of the demodulation reference signal required by the currently configured transmission scheme.
  • the network device may select a suitable mapping rule according to the resource of the demodulation reference signal required by the currently configured transmission scheme, and determine the first mapping relationship.
  • the first mapping relationship may be used to indicate a correspondence between resources of the plurality of demodulation reference signals and at least one transmission scheme. However, it should be understood that this does not mean that the number of demodulation reference signals has a one-to-one correspondence with the transmission scheme, and the number of demodulation reference signals is not directly related to the type of transmission scheme.
  • the network device sends data to the terminal device, one or more demodulation reference signals may be configured for the same terminal device (referred to as the first terminal device for convenience of distinction and description), and thus mapped to a transmission scheme.
  • the network device may send the one or more spatial layers to the first terminal device, corresponding to the network device.
  • One or more demodulation reference signals are transmitted to the terminal device.
  • the embodiment of the present invention uses a first data stream as an example for description. It can be understood that the first data stream is a spatial stream obtained after layer mapping, and may be one layer or multiple layers.
  • the pre-encoded first data stream can be the first pre-coded data stream.
  • the first mapping relationship mentioned here is only a predefined mapping relationship, or a pre-mapped rule. It is a rule followed by a network device when allocating resources for demodulating reference signals to a terminal device, but it does not mean that all ports are configured to transmit data according to a corresponding transmission scheme. For example, when the first mapping relationship specifies that port #0 to port #7 correspond to the transmission scheme of the transmit diversity, this does not mean that the ports 80 to port #7 are all used for the transmission scheme using the transmit diversity. To send data, a network device may only use one or more of these ports. That is to say, the network device needs to allocate resources for demodulating reference signals to the terminal device according to the first mapping relationship according to current needs.
  • the resources of the demodulation reference signal may include at least one of the following: a port, a scrambling code, an orthogonal code, or an orthogonal sequence. At least one of the resources of any two different demodulation reference signals is different. For example, different ports, different scrambling codes, or different scrambling codes for the same port, or different scrambling codes for different ports, or different orthogonal sequences, or different orthogonal codes, or the same port. Different orthogonal codes, or different orthogonal sequences of the same port, and so on.
  • the demodulation reference signal can be distinguished by the resources occupied by the demodulation reference signal in a certain dimension, such as a spatial domain or a code domain. Space division can be achieved by configuring different resources in the demodulation reference signal of at least one dimension.
  • the port number of the demodulation reference signal may indicate an orthogonal code and a time-frequency resource.
  • the orthogonal codes used by the demodulation reference signals of different port numbers are different, or the time-frequency resources are different, or the orthogonal codes and the time-frequency resources are different.
  • a network device usually distinguishes different demodulation reference signals by different port numbers, and may also distinguish different demodulation reference signals by different scrambling codes.
  • different terminal devices may have the same port number, but different demodulation reference signals may be distinguished by different orthogonal sequences.
  • the demodulation reference signal is distinguished by a scrambling code or an orthogonal mask.
  • the network device may also distinguish different demodulation reference signals by other resources than those listed above.
  • the network device sends the first precoding data stream and the first precoding demodulation reference signal to the first terminal device.
  • the first precoding demodulation reference signal is obtained by precoding the first demodulation reference signal, and the first precoded data stream is precoded by the first data stream.
  • the first demodulation reference signal corresponds to the first data stream
  • the resource of the first demodulation reference signal corresponds to a transmission scheme of the first data stream, that is, the network device can be based on a predetermined first mapping relationship, and a transmission scheme of the data stream, determining a resource of the first demodulation reference signal, and transmitting the first demodulation reference signal and the first data stream.
  • the network device may map the first precoding demodulation reference signal and the first precoding data stream to the same resource block (RB) and send the information to the first terminal device. It can be understood that the first precoding solution The tone reference signal is different from the RE occupied by the first precoded data stream.
  • the network device and the terminal device pre-store the time-frequency resources occupied by the demodulation reference signal on different ports, that is, the pilot pattern.
  • the pilot pattern may be the DMRS pilot of the highest 8 ports specified in the protocol.
  • the pattern, or DMRS pilot pattern which may also be more or fewer ports specified in existing or future protocols.
  • the network device can determine the occupied time-frequency resource, that is, the RE, according to the pilot pattern, and then map the data stream to the RE occupied by the undemodulated reference signal, and pass the OFDM. After modulation, it is sent out through the antenna port.
  • the network device may simultaneously transmit data with a plurality of terminal devices (including the first terminal device described above) in the same cell, if one or more of the plurality of terminal devices are in the same
  • the time-frequency resource is transmitted with the network device, and the first terminal device may be interfered by other terminal devices; and the first terminal device may also be located in the cell edge area, if one or more terminal devices of the neighboring cell are also If the data is transmitted on the same time-frequency resource, the first terminal device may also be interfered by the terminal device of the neighboring cell.
  • the terminal device described above that may cause interference to the first terminal device is referred to as the second terminal device.
  • the second terminal device may be a terminal device that is located in the same cell as the first terminal device, and may also be a terminal device of the neighboring cell, which is not specifically limited in this embodiment of the present invention.
  • the first terminal device and the second terminal device use the same time-frequency resource to transmit data, it is likely to be interfered by the second terminal device, and interference estimation is required.
  • the demodulation reference signal received by the second terminal device (referred to as a second demodulation reference signal for convenience of distinction and description) and the data stream (for convenience of distinction and description, recorded as the second data stream) may be It is sent by the above network device, or it can be sent by other network devices.
  • This embodiment of the present invention is not particularly limited.
  • the second terminal device can be one or more.
  • the number of the second demodulation reference signals sent by the network device (for example, the network device of the local cell or the network device of the neighboring cell) to each of the second terminal devices may also be one or more, and correspondingly,
  • the number of layers of the second data stream sent by the network device (for example, the network device of the local cell or the network device of the neighboring cell) to each of the second terminal devices may be one layer or multiple layers. This embodiment of the present invention is not particularly limited.
  • the second terminal device is located in the same cell as the first terminal device, and the second terminal device receives the second data stream and the second demodulation reference signal sent by the same network device.
  • the network device sends a second precoding demodulation reference signal and a second data stream, where the resources of the second precoding demodulation reference signal are determined according to a transmission scheme of the second data stream.
  • the second precoding demodulation reference signal is obtained by precoding the second demodulation reference signal by the network device, and the second precoded data stream is obtained by precoding the second data stream by the network device.
  • the second demodulation reference signal corresponds to a second data stream, and the resource of the second demodulation reference signal corresponds to a transmission scheme of the second data stream.
  • the network device may determine the resource of the second demodulation reference signal according to the transmission scheme of the second data stream and the first mapping relationship, for example, The port of the demodulation reference signal, the scrambling code, the orthogonal code or the orthogonal sequence, and the like.
  • the port of the second demodulation reference signal in the following line transmission is illustrated.
  • the first terminal device does not know on which port the network device will send the second precoding demodulation reference signal and the second precoding data stream, but the first terminal device may try to receive the second precoding on each port. Demodulate the reference signal. In the case where the second precoding demodulation reference signal is received, interference estimation can be further performed.
  • the first terminal device may also receive, from the network device of the neighboring cell, the second precoding demodulation reference signal and the second preamble sent to the second terminal device.
  • the encoded data stream is not specifically limited in the embodiment of the present invention.
  • the first terminal device receives the first precoding demodulation reference signal and the first precoded data stream sent by the network device, and simultaneously listens to the second precoding demodulation reference sent by the network device to other terminal devices. Signal and second precoded data stream.
  • the first precoded demodulation reference signal is used to demodulate the first precoded data stream. That is, the channel matrix of the first precoded data stream is obtained by channel estimation, thereby recovering the first data stream.
  • the first terminal device also receives the second precoding demodulation reference signal and the second precoding data stream at the same time, that is, is interfered by other channels. Therefore, the first terminal device needs to estimate the interference channel to process the received signal to recover the first data stream.
  • the first terminal device acquires a first mapping relationship.
  • the first mapping relationship may be pre-defined, that is, statically configured, by each network device and each terminal device (including the foregoing first terminal device).
  • the first mapping relationship may be pre-stored in the memory of each network device and each terminal device, so that the network device and the terminal device directly acquire from the memory when needed.
  • the correspondence between the port number of the demodulation reference signal and the transmission scheme is fixed after being determined.
  • the first mapping relationship can be as shown in any one of Figures 4-8.
  • the first mapping relationship may also be determined by the network device according to the resources of the demodulation reference signal required by the currently configured transmission scheme, that is, dynamically configured or semi-statically configured.
  • the first mapping relationship is determined by the network device according to the mapping rule pre-negotiated with each terminal device (including the first terminal device) and the resource of the demodulation reference signal required by the currently configured transmission scheme, and Notifying the terminal device of the indication information of the first mapping relationship by using signaling.
  • the first mapping relationship may also be specified by the network device and notified to the first terminal device.
  • the network device directly sends the first mapping relationship to the first terminal device.
  • the first terminal device does not need to determine the first mapping relationship by itself.
  • the network device and the first terminal device may pre-store the indexes of the multiple mapping relationships and the multiple mapping relationships in the memory, and each of the multiple mapping relationships corresponds to at least A transmission scheme, or each transmission scheme, corresponds to at least one mapping relationship.
  • the network device After determining the first mapping relationship according to the resource of the demodulation reference signal required by the currently configured transmission scheme, the network device directly notifies the first terminal device of the index of the first mapping relationship, and the first terminal device can The first mapping relationship is determined according to an index.
  • the network device and the first terminal device do not need to determine various possible mapping relationships by themselves, and the network device only needs to demodulate the reference signal resources according to the currently configured transmission scheme from multiple mappings.
  • a suitable mapping relationship is determined in the relationship, which is used as the first mapping relationship, and the indication information (ie, the index) of the first mapping relationship is sent to the first terminal device.
  • the network device and the first terminal device may determine at least one mapping relationship according to at least one mapping rule negotiated by the two parties in advance (hereinafter, how to determine the mapping relationship according to the mapping rule according to the drawing)
  • Each of the at least one mapping relationship is used to indicate a possible transmission scheme of the resources of the plurality of demodulation reference signals and the at least one transmission scheme.
  • Each mapping relationship corresponds to an index.
  • the network device After determining the first mapping relationship according to the resource of the demodulation reference signal required by the currently configured transmission scheme, the network device directly notifies the first terminal device of the index of the first mapping relationship, and the first terminal device can The first mapping relationship is determined according to an index.
  • the first terminal device needs to determine various possible mapping relationships by itself.
  • the first terminal device may be stored in the memory, and each time the index of the first mapping relationship sent by the network device is received, according to the index, The first mapping relationship is directly determined.
  • the indication information that the network device sends the first mapping relationship to the first terminal device may be implemented by using any one of the following three manners:
  • Manner 1 The network device sends a radio resource control (RRC) message to the first terminal device, where the RRC message carries the indication information of the first mapping relationship; or
  • RRC radio resource control
  • the network device sends a media access control (MAC) control cell (CE) to the first terminal device, where the MAC-CE carries the indication information of the first mapping relationship; or
  • MAC media access control
  • CE control cell
  • the network device sends a physical downlink control channel (PDCCH) to the first terminal device, where the PDCCH carries the indication information of the first mapping relationship. Specifically, the indication information of the first mapping relationship is carried in a DCI in the PDCCH.
  • PDCCH physical downlink control channel
  • the indication information of the first mapping relationship may be an index of the mapping rule corresponding to the first mapping relationship, or the indication information of the first mapping relationship may be the first mapping relationship itself.
  • the indication information of the first mapping relationship may be the first mapping relationship itself; if the first terminal device saves the multiple mapping rules and indexes, or If the plurality of mapping relationships and indexes are saved, the first mapping relationship may be determined according to the index.
  • the second terminal device does not belong to the same cell as the first terminal device (for convenience of distinction and description, it is assumed that the first terminal device belongs to the first cell, and the serving network device of the first cell is recorded as the first network.
  • An indication information of the mapping relationship, and the indication information of the first mapping relationship is sent to the first terminal device.
  • the first mapping relationship between the first cell and the first mapping relationship of the second cell may be different.
  • the indication information of the first mapping relationship may be included in the indication information of the first mapping relationship.
  • the cell identifier is added to facilitate the first terminal device to distinguish the first mapping relationship of different cells.
  • the method for obtaining the first mapping relationship by the first terminal device listed above is only an example, and should not be limited to the embodiment of the present invention.
  • the first terminal device may also receive the first When a mapping relationship is performed, the subsequent processing is performed according to the pre-stored first mapping relationship; when the first mapping relationship sent by the network device is received, subsequent processing is performed according to the received first mapping relationship.
  • the mapping rule includes: mapping the index number of the at least one demodulation reference signal to one transmission in sequence, starting from a specific index number according to the index of the resource of the demodulation reference signal. Program.
  • the index number of the demodulation reference signal includes a port number of the demodulation reference signal.
  • the port number corresponding to each transmission scheme can be relative stable.
  • any one of the transmission schemes may correspond to at least one mapping relationship.
  • the transmission scheme may be: a spatial frequency block code (SFBC), a precoding polling, or a CLSM.
  • SFBC spatial frequency block code
  • CLSM CLSM
  • the mapping rule includes: mapping, in the order of the port number from small to large, to at least one demodulation reference signal port to a transmission scheme, where the transmission scheme configured by the network device for each terminal device includes only one transmission scheme. .
  • the above specific port number is port#0.
  • the network device uses the same transmission scheme to transmit data with different terminal devices.
  • the same transmission scheme is SFBC.
  • one or more ports may be mapped to one transmission scheme from port#0 to port#7 in the order of port numbers from small to large.
  • the number of ports required for SFBC is an even number, for example, 2, 4 or more.
  • the ports are sequentially mapped to the same transmission scheme, that is, SFBC is used to transmit data to a terminal device.
  • At least one consecutive port number can be mapped to a transmission scheme that points to a terminal device.
  • FIG. 4 is a schematic diagram of a correspondence between port numbers of multiple demodulation reference signals and at least one transmission scheme according to an embodiment of the present invention.
  • the two ports are sequentially mapped to a transmission scheme for transmitting data to one terminal device.
  • port #0 and port #1 point to terminal device #1
  • port #2 and port #3 point to terminal device #2
  • port #4 and port #5 point to terminal device #3
  • port #6 and port #7 point to terminal Device #4
  • the four ports are sequentially mapped to a transmission scheme for transmitting data to one terminal device. If more ports are needed, you can map multiple ports to one transmission scheme in turn, in the same way, according to the port number from small to large, pointing to a terminal device.
  • mapping rules are exemplarily described above with SFBC as a possible transmission scheme, and should not be construed as limiting the embodiments of the present invention.
  • the transmission scheme can also be CLSM, precoding polling, and the like.
  • each port can be sequentially mapped to a transmission scheme according to the port number from small to large, pointing to a terminal device.
  • each of the three ports may be sequentially mapped to one transmission scheme according to the above mapping rule, in order of the port number from small to large, pointing to one terminal. device.
  • the mapping rule can also be defined as: mapping a plurality of consecutive ports to a transmission scheme starting from the first port of the port with an even port number.
  • the specific port number is port#0.
  • Port#0, port#1, and port#2 are mapped to a transmission scheme, pointing to a terminal device, mapping port#4, port#5, and port6 to one transmission scheme, pointing to another terminal device.
  • the mapping rule may also be defined as: starting from the first port of the port with an odd port number, mapping a plurality of consecutive ports to one transmission scheme, and for the case of the above precoding polling, the specific port number For port#1. For the sake of brevity, we will not list them one by one here.
  • the network device may determine the mapping relationship based on the number of demodulation reference signal ports that may be required by various transmission schemes specified in existing or future protocols.
  • the mapping rule includes: when the transmission scheme configured by the network device for each terminal device includes at least two transmission schemes, dividing the plurality of demodulation reference signal ports into at least two groups, and the port number of each group of demodulation reference signal ports Continuously, each group of demodulation reference signal ports corresponds to a transmission scheme, and at least one demodulation reference signal port is sequentially mapped to a transmission scheme according to the order of the port numbers from small to large.
  • the communication system supports data transmission of up to 12 ports, respectively port#0 ⁇ port#11, and the network device uses two transmission schemes to transmit data with different terminal devices.
  • the two transmission schemes are SFBC and precoding polling.
  • the 12 ports can be divided into two groups, and the port numbers of each group of ports are consecutive.
  • mapping rule may further specify a first port number mapped to each transmission scheme.
  • the network device may determine the first mapping relationship according to a port of the demodulation reference signal required by the currently configured transmission scheme and a predefined mapping rule.
  • port#0 is mapped to the first port number of SFBC
  • port#6 is mapped to the first port number of precoding polling. That is, the first six port numbers are grouped into one group, mapped to SFBC, and the last six port numbers are grouped into one group, which is mapped to precoding polling, as shown in FIG. 5.
  • FIG. 5 is another schematic diagram of a correspondence between port numbers of multiple demodulation reference signals and at least one transmission scheme according to an embodiment of the present invention.
  • port#0 is mapped to the first port number of the precoding poll
  • port#6 is mapped to the first port number of the SFBC. That is, the first six port numbers are grouped into one, mapped to precoding polling, and the last six port numbers are grouped into one group and mapped to SFBC.
  • port#0 is mapped to the first port number of SFBC
  • port#4 is mapped to the first port number of precoding polling. That is, the first four port numbers are grouped together, mapped to SFBC, and the last eight port numbers are grouped together and mapped to precoding polling.
  • port#0 is mapped to the first port number of the precoding poll
  • port#4 is mapped to the first port number of the SFBC. That is, the first 4 port numbers are grouped into one group, mapped to precoding polling, and the last 8 port numbers are grouped into one group and mapped to SFBC.
  • the first terminal device can obtain a plurality of mapping relationships corresponding to the plurality of mapping rules.
  • the SFBC and precoding polling of the above examples are illustrative of possible mapping schemes as possible transmission schemes, and should not be construed as limiting the embodiments of the present invention.
  • the at least one transmission scheme described above may also include other transmission schemes, such as a CLSM.
  • the at least one transmission scheme includes two or more transmission schemes, and the number of ports required by the two or more transmission schemes is different, the following mapping rules may be used.
  • the communication system supports data transmission of up to 8 ports, respectively port#0 ⁇ port#7, and the network device uses two transmission schemes to transmit data with different terminal devices.
  • the two transmission methods include SFBC and CLSM.
  • FIG. 6 is another schematic diagram of a correspondence between port numbers of multiple demodulation reference signals and at least one transmission scheme according to an embodiment of the present invention.
  • mapping relationships defined according to various mapping rules are listed, but this should not be construed as limiting the embodiments of the present invention.
  • the network device and the terminal device specify the same index or identifier for each mapping rule, so as to distinguish different mapping relationships.
  • the first mapping relationship may be determined by the network device and the terminal device according to at least one mapping rule negotiated in advance, and may be applicable to the entire communication system.
  • the cell in which the first terminal device is located and the network device and the terminal device in the neighboring cell follow the at least one mapping rule to determine the correspondence between the resource of the demodulation reference signal and the transmission scheme.
  • the first mapping relationship that is followed at a certain time in the two cells may be different, it is determined according to one of the at least one mapping rule, and may be understood as being determined in at least one mapping relationship.
  • the first mapping relationship, the terminal device and the network device can all know the first mapping relationship of the local cell or the neighboring cell.
  • the first terminal device acquires the first mapping relationship.
  • the network device may determine the first mapping relationship according to resources of the demodulation reference signal required by the currently configured transmission scheme.
  • the port is used as an example. If the network device determines that the currently configured transmission schemes are all SFBC, the mapping rule described above in conjunction with FIG. 4 may be directly selected to determine the first mapping relationship; if the network device determines that the currently configured transmission scheme uses SFBC. If there are many ports, and there are fewer ports using precoding polling, the mapping rule described above in conjunction with FIG. 5 can be selected to determine the first mapping relationship.
  • the mapping rule is only described in detail by using the port number as an example, but the embodiment of the present invention should not be limited in any way.
  • the first mapping relationship may also be an index of the scrambling code identifier of multiple demodulation reference signals.
  • the correspondence between the number and the at least one transmission scheme, or the port number of the plurality of demodulation reference signals, the index number of the scrambling code identifier, and the correspondence between the at least one transmission scheme As shown in Figure 7 and Figure 8.
  • FIG. 7 is a schematic diagram of a correspondence between an index number of a scrambling code identifier of a plurality of demodulation reference signals and at least one transmission scheme according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a port number of a plurality of demodulation reference signals, an index number of a scrambling code identifier, and a correspondence relationship between at least one transmission scheme according to an embodiment of the present invention. It can be seen that in the case of determining the resource of the demodulation reference signal, the transmission scheme of its corresponding data stream can also be determined. It should also be understood that FIG. 7 and FIG. 8 are only the correspondence between the resources of the demodulation reference signal and the transmission scheme shown for ease of understanding, and should not be construed as limiting the embodiments of the present invention.
  • resources of corresponding demodulation reference signals may be separately set for various transmission schemes, or resources of corresponding demodulation reference signals may be set only for partial transmission schemes.
  • resources of corresponding demodulation reference signals may be separately set for each transmission scheme, or may be separately set for only two transmission schemes of SFBC and precoding polling.
  • Corresponding demodulation reference signals without setting a corresponding demodulation reference signal for the CLSM.
  • the network device can preferentially configure the resources of the demodulation reference signal for the two transmission schemes of SFBC and precoding polling, and then configure the resources of the demodulation reference signal for the CLSM. That is, the SFBC and precoding polling are directly related to the resources of the demodulation reference signal, and the CLSM is indirectly associated with the resources of the demodulation reference signal.
  • the first terminal device cannot accurately determine the transmission scheme of the data stream corresponding to the demodulation reference signal according to the first mapping relationship, but traverses on all unused ports as compared with the prior art.
  • the method of trying different transmission schemes reduces the range of blind detection, reduces the complexity of interference estimation and demodulation of the receiving device to a certain extent, and reduces the delay caused by data processing.
  • the network device can perform SFBC according to a predetermined mapping rule.
  • the transmission scheme with precoding polling is mapped to the port according to the mapping rule, as shown in FIG. 5.
  • port#0 and port#1, port#2 and port#3, port#6, and port#7 may be used only, and the network device may further
  • the unoccupied ports ie, port #4 and port #5, port #8 to port #11 are assigned to the transmission scheme of the CLSM.
  • the network device may assign any one or more of the remaining 6 ports to the CLSM, or may assign a port to the terminal device of the CLSM according to a predefined mapping rule. This application is not particularly limited.
  • the first terminal device determines a resource of the first demodulation reference signal and a transmission scheme of the first data stream.
  • the DCI sent by the network device to the first terminal device carries the indication information of the resource of the first demodulation reference signal.
  • the first terminal device may directly determine the port number of the first demodulation reference signal and/or the index number (n SCID ) of the scrambling identity according to the indication field in the DCI.
  • the DCI sent by the network device to the first terminal device carries the indication information of the transmission scheme of the first data stream.
  • the first terminal device may directly determine a transmission scheme of the first data stream according to the DCI sent by the network device.
  • the indication information carrying the transmission scheme in the DCI can be implemented by adding an indication field in the DCI or using an existing reserved field to indicate.
  • the first terminal device may determine the transmission scheme of the first data stream according to the port of the first precoding demodulation reference signal according to the first mapping relationship acquired in S310.
  • the first terminal device demodulates the first precoded data stream according to the first precoding demodulation reference signal.
  • the first terminal device estimates an equivalent channel matrix of the first precoded data stream according to the first precoding demodulation reference signal received in S308, and further demodulates the first precoded data stream.
  • the first terminal device receives the second precoded data stream and the second precoding demodulation reference signal sent by the network device to the other device while receiving the first precoded data stream, this may be back A pre-coded data stream generates interference, which causes the first data stream to be unrecoverable. Therefore, the first terminal device needs to perform interference estimation.
  • the first terminal device may determine, according to an association relationship between a resource of the demodulation reference signal and a transmission scheme, and a resource of the second demodulation reference signal, a transmission scheme of the second data stream.
  • the relationship between the resource of the demodulation reference signal and the transmission scheme may be a direct association relationship, for example, a correspondence between resources of the plurality of demodulation reference signals and at least one transmission scheme, that is, , the first mapping relationship.
  • the first terminal device may determine, according to the port corresponding to the received second demodulation reference signal and the first mapping relationship, that the transmission scheme corresponding to the port of the second demodulation reference signal is the second data stream. Transmission scheme.
  • the first terminal device may determine that port#0 and port#1 are already occupied, and also use SFBC. Transmission scheme, and the following four ports (port#4 ⁇ port#7) are not occupied, and the first terminal device can determine that the second precoding demodulation reference signal corresponds to port#0 and port#1, directly The second precoding demodulation reference signal is received on port #0 and port #1, and the transmission scheme of the two ports is determined to be SFBC.
  • the first terminal device does not need to try other transmission schemes on port #0 and port #1, and can directly estimate the channel matrix of the interference channel according to the transmission scheme of the SFBC. Thereafter, the first terminal device continues to try to receive the second precoding demodulation reference signal on port #4 to port #7, and estimates the channel of the interference channel according to the SFBC and the received demodulation reference signal if received. matrix.
  • the first terminal device may determine that port#0 ⁇ port#3 is already occupied, and also uses SFBC. Transmission scheme.
  • the second precoding demodulation reference signal may correspond to four ports, that is, port#0 to port#3, or the second precoding demodulation reference signal is a demodulation reference signal for two terminal devices.
  • the number of the second terminal devices is 2, and each of the second terminal devices corresponds to two ports, that is, two groups of ports port#0, port#1 and port#2, port#3, the first terminal device
  • the second precoding demodulation reference signal may be attempted to be received on the two sets of ports, respectively, and the channel matrix of the interference channel is further estimated according to the transmission scheme of the SFBC when the second precoding demodulation reference signal is received.
  • the first terminal device continues to try to receive the second precoding demodulation reference signal on port #6 and port #7, and, if received, estimates the channel of the interference channel according to the SFBC and the received demodulation reference signal. matrix.
  • the first terminal device may determine that port#0 and port#1 are already occupied, and also use SFBC.
  • the transmission scheme however, the first terminal device does not determine whether the last eight ports (port#4 ⁇ port#11) are used, but it can be determined that if port#4 and port#5 receive the second
  • the precoding demodulation reference signal then the transmission scheme of SFBC is still used on port #4 and port #5. If one of the last six ports (port#6 ⁇ port#11) is used, it must be port#6, and the corresponding transmission scheme is precoding polling.
  • the first terminal device may start to receive the second precoding demodulation reference signal from port #6. If not, it indicates that the last six ports are unoccupied, and if received, may further receive on port#7.
  • the second precoding demodulates the reference signal and estimates a channel matrix of the interference channel according to a transmission scheme of the precoding poll. Until the second precoding demodulation reference signal is not received on a certain port (for example, port#10), it indicates that the port after the port (ie, port#10 and port#11) is unoccupied and does not need to be used again. Attempting to receive a second precoded demodulation reference signal.
  • the first terminal device may determine that port#4 ⁇ port#7 are already occupied, and both use the transmission scheme of the CLSM. However, the first terminal device does not determine whether the first four ports (port#0 ⁇ port#3) are used, but it can be determined that if one of the first four ports is used, it must be port#0.
  • the corresponding transmission scheme is SFBC.
  • the first terminal device may start to receive the second precoding demodulation reference signal from the port #0. If not, the first four ports are unoccupied, and if received, the terminal device may further be on the port #1.
  • a second precoding demodulation reference signal is received, and a channel matrix of the interference channel is estimated according to a transmission scheme of the SFBC. Until the second precoding demodulation reference signal is not received on a certain port (port#2), it means that the port after the port is changed (ie, port#2 ⁇ port#3) is not occupied, and no need to try again. A second precoded demodulation reference signal is received.
  • the embodiment of the present invention reduces the guessing of the first terminal device (or rather than the method of traversing all the different transmission schemes used on all unused ports in the prior art).
  • the range of blind detection reduces the complexity of interference estimation and demodulation.
  • the first terminal device described above determines that the transmission scheme of the second data stream has a direct association relationship according to the first mapping relationship and the resources of the second demodulation reference signal, and demodulates the resource and transmission scheme of the reference signal.
  • the association relationship may also be indirect.
  • the first mapping relationship may be determined only according to the partial transmission scheme and the corresponding mapping rule.
  • the first terminal device may still be based on the first mapping relationship and the second demodulation reference signal. Resource, determining the transmission scheme of the second data stream.
  • the network device uses both SFBC and CLSM transmission schemes. Only the correspondence between the SFBC and the port number of the demodulation reference signal is defined in FIG. 4, that is, the network device preferentially assigns the port to the SFBC and the remaining unoccupied ports to the CLSM.
  • the first terminal device receives the first precoding demodulation reference signal at port #4 and port #5, and the transmission scheme of the first data stream corresponding to the first precoding demodulation reference signal is SFBC
  • the first terminal device can determine that port #0 and port #1, port #2 and port #3 are also used, and corresponding to SFBC, only need to try various transmission schemes on port #6 and port #7 (for example, SFBC) , precoding polling, CLSM, etc.) for interference estimation and data demodulation.
  • Embodiments of the present invention reduce the range of guessing (or blind detection) of the first terminal device, as compared to methods used in the prior art to traverse different transmission schemes on all unused ports, The complexity of interference estimation and demodulation is reduced.
  • the network device uses three transmission schemes of SFBC, precoding polling, and CLSM. Only the correspondence between the SFBC and the precoding polling and the port number of the demodulation reference signal is defined in FIG. 5, that is, the network device preferentially assigns the port to the SFBC and precoding polling transmission schemes, and the remaining un The occupied port is assigned to the CLSM.
  • the first terminal device receives the first precoding demodulation reference signal at port #4 and port #5, and the transmission scheme of the first data stream corresponding to the first precoding demodulation reference signal is SFBC
  • the network device allocates six ports port#0 ⁇ port#5 to the SFBC, and the first terminal device can determine that port#0 and port#1, port#2 and port#3 are also used, and corresponds to SFBC.
  • the first terminal device continues to try to receive the second precoding reference signal on port #6. If the second precoding reference signal is received on port #6, the precoding precoding is preferentially attempted on port #6 for interference estimation.
  • Embodiments of the present invention reduce the range of guessing (or blind detection) of the first terminal device, as compared to methods used in the prior art to traverse different transmission schemes on all unused ports, The complexity of interference estimation and demodulation is reduced.
  • the first terminal device determines a channel matrix of the interference channel according to the transmission scheme of the second data stream and the second demodulation reference signal.
  • the channel matrix of the entire RB is estimated to be inaccurate based on the precoding vector of one demodulation reference signal; or, in some transmission schemes
  • the use of the channel matrix of the interfering channel estimated by the precoding vector of the demodulation reference signal e.g., SFBC
  • the first terminal device needs to accurately estimate the channel matrix of each RE according to the transmission scheme of the second data stream and the port of the second demodulation reference signal, or use the channel matrix of the interference channel more accurately.
  • the network device uses two demodulation reference signal ports to transmit and correspond to the two spatial streams.
  • Two data streams ie, the second data stream.
  • the transmission signal S of the second data stream may be:
  • the channel matrices estimated according to the received two demodulation reference signals are: h 1 and h 2 respectively . If the covariance matrix of the interference channel is directly determined according to h 1 and h 2 , then the channel The use of the matrix is not accurate.
  • the transmission scheme is SFBC, it is assumed that the second precoded data stream corresponds to two layers, and according to the received second precoding demodulation reference signal (it can be understood that the demodulation reference signal corresponding to the second precoded data stream is 2)
  • the estimated channel matrix should be:
  • a covariance matrix of the interference channel can be determined, and then the received signal is processed.
  • FIG. 9 shows a schematic diagram of precoding different REs in the same RB. It can be seen that on one OFDM symbol, the REs corresponding to multiple (for example, 4) consecutive subcarriers are grouped, and the precoding vectors of the REs in each group are two-two different.
  • the precoding granularity is RE, that is, RE level, which is different from other transmission schemes.
  • the precoding granularity of SFBC is RB, that is, RB level (RB-level).
  • the first terminal device determines an interference noise covariance matrix according to a channel matrix of the interference channel.
  • the first terminal may estimate a channel matrix of the corresponding interference channel according to the received at least one second precoding demodulation reference signal, and further obtain an interference noise covariance matrix.
  • the corresponding interference noise covariance matrix is H i H i H .
  • H represents conjugate transposition; for example, for a transmission scheme of precoding polling, the channel matrices corresponding to any two REs in the same group are different, and the corresponding interference noise covariance matrix is also different, in each When the signal on the RE is processed, it is necessary to determine the interference noise covariance matrix based on the channel matrix used by each RE.
  • the first terminal device processes the received signal according to the interference noise covariance matrix to recover the first data stream.
  • the first terminal device can process the received signal according to the following formula:
  • i denotes the channel of the first data stream
  • j denotes the interference channel
  • N 0 I denotes Gaussian white noise
  • W denotes a weight matrix
  • Representing a signal received by the first terminal device Representing a vector of the first data stream sent by the network device; Indicates Gaussian white noise; H denotes a channel matrix; Represents an estimate of the vector of the first data stream transmitted by the network device.
  • the first terminal device can recover the first data stream.
  • the first terminal device performs verification according to a cyclic redundancy check (CRC) in the first data stream, and if the verification succeeds, the demodulation of the first data stream is successful; If the test is unsuccessful, the interference estimate needs to be re-executed.
  • CRC cyclic redundancy check
  • MMSE-IRC algorithm for processing the received signal and the process of data demodulation of the above example may be the same as the prior art, and a detailed description of the specific process thereof is omitted herein for the sake of brevity.
  • the MMSE-IRC as a receiving algorithm using the interference noise covariance matrix is merely exemplary, and should not be construed as limiting the embodiments of the present invention.
  • the method of processing to recover the data stream is merely exemplary, and should not be construed as limiting the embodiments of the present invention. The method of processing to recover the data stream.
  • the embodiment of the present invention pre-defines the correspondence between the resources of the demodulation reference signal and the at least one transmission scheme, and allocates resources of the demodulation reference signal to different transmission schemes according to the correspondence, so that the receiving device receives the
  • the transmission scheme used by the interference signal can be directly determined according to the above correspondence, or the transmission scheme used for the interference signal can be blindly detected in a small range to process the signal.
  • the complexity of interference estimation and demodulation of the receiving device is reduced, and the delay caused by data processing is reduced.
  • the method 300 for data transmission in downlink transmission is described in detail above in connection with FIGS. 3 through 9. It can be understood that the method is equally applicable to uplink transmission.
  • a method 400 for data transmission in uplink transmission is described in detail below with reference to FIGS. 10 through 13.
  • FIG. 10 shows a schematic diagram of a communication system 200 suitable for use in a method of data transmission in accordance with an embodiment of the present invention.
  • the terminal device #1 transmits data to the network device #1 on the time-frequency resource #A
  • the terminal device #2 transmits the data to the network device #2 on the same time-frequency resource (ie, time-frequency resource #A).
  • the data is transmitted, and the network device #1 and the network device #2 are base stations of two adjacent cells, and the network device #1 may receive the terminal device #2 to the network device while receiving the data transmitted by the terminal device #1. #2
  • the interference of the transmitted pilot and data The solid line in the figure shows the data transmitted by the terminal device to the network device, and the broken line shows the interference generated by the data transmitted by the other terminal device to the network device.
  • port numbers used by different terminal devices may be duplicated, and demodulation reference signals of different terminal devices may be distinguished by different orthogonal sequences, that is, resources for demodulating reference signals include The orthogonal sequence or orthogonal code of the reference signal is demodulated. Scrambling by using different orthogonal codes or orthogonal sequences allows different terminal devices to transmit data on the same time-frequency resource.
  • the orthogonal sequence and the orthogonal sequence can be distinguished by the index number of the orthogonal sequence, and the orthogonal code and the orthogonal code can be distinguished by the index number of the orthogonal code. Therefore, in the embodiment of the present invention, the resources of the demodulation reference signal include an orthogonal sequence or an orthogonal code.
  • FIG. 11 is a schematic flowchart of a method 400 for data transmission provided by another embodiment of the present invention, which is shown from the perspective of device interaction. It should be understood that FIG. 11 illustrates communication steps or operations of the method for data transmission according to an embodiment of the present invention, but these steps or operations are merely examples, and other operations in the embodiment of the present invention or various in FIG. 11 may be performed. The deformation of the operation. Moreover, the various steps in FIG. 11 may be performed in a different order than that presented in FIG. 11, and it is possible that not all operations in FIG. 11 are to be performed.
  • first and second are used only to distinguish different objects, and should not be construed as limiting the embodiments of the present invention. For example, it is used to distinguish different cells, different network devices, different terminal devices, different spatial streams, different demodulation reference signals, and the like.
  • the first network device e.g., may correspond to network device #1 in Figure 11
  • the first terminal device e.g., may correspond to terminal device #1 in Figure 11
  • the second network device e.g., may correspond to network device #2 in FIG. 11
  • the second terminal device e.g., may correspond to terminal device #2 in FIG. 11
  • the method 400 includes:
  • the first network device acquires a first mapping relationship of the first cell.
  • the first mapping relationship of the first cell is used to indicate a correspondence between resources of multiple demodulation reference signals in the first cell and at least one transmission scheme.
  • the first mapping relationship may be statically configured, that is, the first mapping relationship may be pre-defined by each network device and each terminal device, and stored in a memory of each network device and each terminal device, so that Network devices and terminal devices are obtained directly from memory when needed.
  • the first mapping relationship between the cell and the cell may be the same, or may be different.
  • the network device of each cell may pre-store the first mapping relationship of each cell and The first mapping relationship of the neighboring cell.
  • the first mapping relationship may also be a dynamic or semi-static configuration.
  • the first mapping relationship of the first cell may be determined by the first network device according to a predefined mapping rule and a resource of a demodulation reference signal required by a currently configured transmission scheme. In this case, the first mapping relationship of each cell may be different.
  • the first terminal device acquires a first mapping relationship of the first cell.
  • the first terminal device may be directly obtained from the memory; if the first mapping relationship is a dynamic or semi-static configuration, the first network device may notify the first Terminal Equipment.
  • the second network device acquires a first mapping relationship of the second cell.
  • the second terminal device acquires a first mapping relationship of the second cell.
  • the first mapping relationship may be used to indicate a correspondence between an index number of an orthogonal sequence of the plurality of demodulation reference signals and at least one transmission scheme, as shown in FIG.
  • the first mapping relationship may be used to indicate a correspondence between a port of the demodulation reference signal, an index number of the orthogonal sequence, and at least one transmission scheme, as shown in FIG.
  • FIG. 12 is a schematic diagram of a correspondence between an index number of an orthogonal sequence of a plurality of demodulation reference signals and at least one transmission scheme according to an embodiment of the present invention.
  • Figure 12 shows the correspondence between the index numbers of the eight orthogonal sequences and at least one transmission scheme. Regardless of the number of terminal devices, if the number of index numbers of the provided orthogonal sequences is determined, it can be as shown in Fig. 12.
  • the first mapping relationship shown in the figure allocates resources for the demodulation reference signal for the transmission scheme.
  • FIG. 13 is a schematic diagram of correspondence between port numbers of multiple demodulation reference signals, index numbers of orthogonal sequences, and at least one transmission scheme according to an embodiment of the present invention. Assuming that each terminal device provides at most two ports, FIG. 13 shows the correspondence between the eight port numbers of the four terminal devices, the index numbers of the eight orthogonal sequences, and at least one transmission scheme. It can be seen that the orthogonal sequence of any two ports is different, even if the port numbers are the same, the demodulation reference signals of different terminal devices can be distinguished by different orthogonal sequences.
  • the first terminal device sends the first precoding demodulation reference signal and the first precoded data stream to the first network device.
  • the first precoding demodulation reference signal is obtained by precoding the first demodulation reference signal, and the first precoded data stream is precoded by the first data stream.
  • the first demodulation reference signal corresponds to the first data stream
  • the resource of the first demodulation reference signal corresponds to the transmission scheme of the first data stream, that is, the first terminal device may be according to the predetermined first cell a mapping relationship, and a transmission scheme of the first data stream, determining an orthogonal sequence of the first demodulation reference signal, performing scrambling processing on the first demodulation reference signal, and transmitting the first demodulation reference signal and the first data flow.
  • the second terminal device sends the second precoding demodulation reference signal and the second precoded data stream to the second network device.
  • the second precoding demodulation reference signal is obtained by precoding the second demodulation reference signal, and the second precoded data stream is precoded by the second data stream.
  • the second demodulation reference signal corresponds to the second data stream
  • the resource of the second demodulation reference signal corresponds to the transmission scheme of the second data stream, that is, the second terminal device may be according to the predetermined second cell.
  • a second mapping relationship, and a transmission scheme of the second data stream determining an orthogonal sequence of the second demodulation reference signal, performing scrambling processing on the second demodulation reference signal, and transmitting the second demodulation reference signal and the second data flow.
  • the first network device receives the first precoding demodulation reference signal and the first precoded data stream sent by the first terminal device, and the second precoding demodulation reference signal and the second Two precoded data streams.
  • the first network device may be interfered by the second precoded demodulation reference signal and the second precoded data stream when receiving the first precoded demodulation reference signal and the first precoded data stream.
  • the first network device determines, according to the first mapping relationship of the first cell, a transmission scheme of the first data stream.
  • the first network device acquires a first mapping relationship of the second cell.
  • the first mapping relationship of the second cell and the first mapping relationship of the first cell may be the same or different.
  • the first network device may directly use the first mapping relationship of the first cell as the first mapping relationship common to each cell; If the first mapping relationship of the first cell and the first mapping relationship of the second cell are different, the first terminal device may acquire the first mapping relationship of the second cell from the first network device in advance, and save the information in the memory, or The first network device may be sent to the first terminal device by means of a broadcast.
  • the second network device may send a first mapping relationship of the second cell to the first network device by using an interface between the network devices (for example, an X2 interface), where The first network device may send the first mapping relationship of the second cell to the first terminal device by using a broadcast manner.
  • an interface between the network devices for example, an X2 interface
  • the first network device determines a transmission scheme of the second data stream according to the first mapping relationship of the second cell and the received resource of the second precoding demodulation reference signal.
  • the first network device may determine, according to the first mapping relationship of the second cell, a transmission scheme corresponding to the orthogonal sequence of the received second precoding demodulation reference signal, that is, a transmission scheme of the second data stream.
  • the first network device determines a channel matrix of the interference channel according to the transmission scheme of the second data stream and the second precoding demodulation reference signal.
  • the first network device determines an interference noise covariance matrix according to a channel matrix of the interference channel.
  • the first network device processes the received signal to recover the first data stream.
  • the embodiment of the present invention pre-defines the correspondence between the resources of the demodulation reference signal and the at least one transmission scheme, and allocates resources of the demodulation reference signal to different transmission schemes according to the correspondence, so that the receiving device receives the
  • the transmission scheme used by the interference signal can be directly determined according to the above correspondence, or the transmission scheme used for the interference signal can be blindly detected in a small range to process the signal.
  • the complexity of interference estimation and demodulation of the receiving device is reduced, and the delay caused by data processing is reduced.
  • the resources of the demodulation reference signals enumerated above are only examples, and should not be limited to the embodiments of the present invention.
  • the uplink transmission it is also possible to distinguish different demodulation reference signals by using a port number, a scrambling code, etc., which is not particularly limited in the embodiment of the present invention, and it is even possible to distinguish different solutions by other attributes. Adjust the reference signal.
  • the network device may specify a transmission scheme according to the channel quality, and notify the terminal device of the first mapping relationship corresponding to the transmission scheme by using signaling.
  • the specific process of the network device indicating the indication information of the first mapping relationship to the terminal device is described in detail below with reference to FIG.
  • FIG. 14 is a schematic flowchart of a method for data transmission provided by another embodiment of the present invention, which is shown from the perspective of device interaction. As shown in FIG. 14, the method 500 includes:
  • the network device determines, according to a predefined mapping rule and a resource of a demodulation reference signal required by the currently configured transmission scheme, the first mapping relationship is used to indicate resources of the multiple demodulation reference signals and at least A correspondence between transmission schemes.
  • the network device sends the indication information of the first mapping relationship to the terminal device.
  • S520 specifically includes:
  • the network device sends an RRC message to the terminal device, where the RRC message carries the indication information of the first mapping relationship.
  • S520 specifically includes:
  • the network device sends a MAC-CE to the terminal device, where the MAC-CE carries the indication information of the first mapping relationship.
  • S520 specifically includes:
  • the network device sends a DCI to the terminal device, where the DCI carries the indication information of the first mapping relationship.
  • the terminal device receives the indication information of the first mapping relationship sent by the network device.
  • the terminal device determines, according to the first mapping relationship and a transmission scheme of the received data stream, a resource of the demodulation reference signal, where the demodulation reference signal corresponds to the data stream.
  • the terminal device may correspond to the first terminal device in the method 300 or the method 400, or the terminal device may be any one of the terminal devices in the cell.
  • the embodiment of the present invention determines the first mapping relationship by the network device and notifies the terminal device, so that the terminal device can determine the transmission scheme of the monitored data stream according to the received first mapping relationship. Thereby, dynamic configuration or semi-static configuration of the first mapping relationship can be implemented.
  • FIG. 15 is a schematic block diagram of an apparatus 600 for data transmission according to an embodiment of the present invention. As shown in FIG. 15, the apparatus 600 includes a processing unit 610 and a transmitting unit 620.
  • the apparatus 600 may correspond to a first terminal device in a network device or method 400 in a method 300 for data transmission in accordance with an embodiment of the present invention
  • the apparatus 600 may include a method for performing the method 300 of FIG. A unit of a method performed by a network device or a first terminal device of method 400 of FIG.
  • the units in the device 600 and the other operations and/or functions described above are respectively implemented in order to implement the corresponding processes of the method 300 in FIG. 3 or the method 400 in FIG. 11, and are not described herein again for brevity.
  • the processing unit 610 in the device 600 may correspond to (eg, is itself or configured) the processor 12 in the device 10 for data transmission shown in FIG. 19, in the device 600.
  • the transmitting unit 620 may correspond to (eg, is itself or configured) to the transceiver 11 in the device 10 for data transmission shown in FIG.
  • FIG. 16 is a schematic block diagram of an apparatus 700 for data transmission according to another embodiment of the present invention. As shown in FIG. 16, the apparatus 700 includes a receiving unit 710 and a determining unit 720.
  • the apparatus 700 may correspond to a first network device or a first network device in the method 400 in the method 300 for data transmission according to an embodiment of the present invention
  • the apparatus 700 may include the method for performing the method of FIG. A unit of a method performed by a first terminal device of 300 or a first network device of method 400 of FIG.
  • each unit in the device 700 and the other operations and/or functions described above are respectively implemented in order to implement the corresponding process of the method 300 in FIG. 3 or the method 400 in FIG. 11, and are not described herein again for brevity.
  • the receiving unit 710 in the device 700 may correspond to (eg, is itself or configured) the transceiver 11 in the device 10 for data transmission shown in FIG. 19, in the device 700.
  • the determining unit 720 can correspond to (eg, is itself or configured) the processor 12 in the device 10 for data transmission shown in FIG.
  • FIG. 17 is a schematic block diagram of an apparatus 800 for data transmission according to another embodiment of the present invention. As shown in FIG. 17, the apparatus 800 includes a determining unit 810 and a transmitting unit 820.
  • the apparatus 800 can correspond to a network device in a method 500 for data transmission in accordance with an embodiment of the present invention, which can include means for performing the method of network device execution of the method 500 of FIG.
  • the respective units in the device 800 and the other operations and/or functions described above are respectively implemented in order to implement the corresponding processes of the method 500 in FIG. 14 , and are not described herein again for brevity.
  • the determining unit 810 in the device 800 may correspond to (eg, is itself or configured) the processor 12 in the device 10 for data transmission shown in FIG. 19, in the device 800.
  • the transmitting unit 820 may correspond to (for example, itself or be configured) the transceiver 11 in the device 10 for data transmission shown in FIG.
  • FIG. 18 is a schematic block diagram of an apparatus 900 for data transmission according to an embodiment of the present invention. As shown in FIG. 18, the apparatus 900 includes a receiving unit 910 and a determining unit 920.
  • the apparatus 800 can correspond to a terminal device in a method 500 for data transmission in accordance with an embodiment of the present invention, which can include a unit for performing the method performed by the terminal device of the method 500 of FIG.
  • the respective units in the device 800 and the other operations and/or functions described above are respectively implemented in order to implement the corresponding processes of the method 500 in FIG. 14 , and are not described herein again for brevity.
  • the receiving unit 910 in the device 900 may correspond to (eg, is itself or configured) the transceiver 11 in the device 10 for data transmission shown in FIG. 19, in the device 900.
  • the determining unit 920 can correspond to (eg, is itself or configured) to the processor 12 in the device 10 for data transmission shown in FIG.
  • FIG. 19 is a schematic block diagram of an apparatus 10 for data transmission according to an embodiment of the present invention.
  • the device 10 includes a transceiver 11, a processor 12, and a memory 13.
  • the transceiver 11, the processor 12 and the memory 13 communicate with each other through an internal connection path for transferring control and/or data signals.
  • the memory 13 is for storing a computer program, and the processor 12 is configured to be called from the memory 13.
  • the computer program is run to control the transceiver 11 to send and receive signals.
  • the memory 13 may be disposed in the processor 12 or may be independent of the processor 12.
  • the device 10 may correspond to a first terminal device in a network device or method 400 in a method 300 for data transmission in accordance with an embodiment of the present invention
  • the device 10 may include a method for performing the method 300 of FIG. A unit of a method performed by a network device or a first terminal device of method 400 of FIG.
  • the units in the device 10 and the other operations and/or functions described above are respectively implemented in order to implement the corresponding processes of the method 300 in FIG. 3 or the method 400 in FIG. 11, and are not described herein again for brevity.
  • the device 10 may also correspond to a first network device or a first network device in the method 400 in the method 300 for data transmission according to an embodiment of the present invention, which may include the method for performing the method of FIG. A unit of a method performed by a first terminal device of 300 or a first network device of method 400 of FIG.
  • the respective units in the device 10 and the other operations and/or functions described above are respectively used to implement the corresponding processes of the method 300 in FIG. 3 or the method 400 in FIG. 11, and are not described herein again for brevity.
  • the device 10 may correspond to a network device in a method 500 for data transmission in accordance with an embodiment of the present invention, which may include a unit for performing the method performed by the network device of the method 500 of FIG.
  • each unit in the device 10 and the other operations and/or functions described above are respectively implemented in order to implement the corresponding process of the method 500 in FIG. 14 , and are not described herein again for brevity.
  • the device 10 may correspond to a terminal device in a method 500 for data transmission in accordance with an embodiment of the present invention, which may include a unit for performing the method performed by the terminal device of the method 500 of FIG.
  • each unit in the device 10 and the other operations and/or functions described above are respectively implemented in order to implement the corresponding process of the method 500 in FIG. 14 , and are not described herein again for brevity.
  • the processor may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSPs), and dedicated integration.
  • DSPs digital signal processors
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the memory in embodiments of the invention may be a volatile memory or a non-volatile memory, or may include both volatile and nonvolatile memory.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read only memory (ROMM), an erasable programmable read only memory (erasable PROM, EPROM), or an electrical Erase programmable EPROM (EEPROM) or flash memory.
  • the volatile memory can be a random access memory (RAM) that acts as an external cache.
  • RAM random access memory
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • synchronous dynamic randomness synchronous dynamic randomness.
  • Synchronous DRAM SDRAM
  • DDR SDRAM double data rate synchronous DRAM
  • ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM synchronous connection dynamic random access memory Take memory (synchlink DRAM, SLDRAM) and direct memory bus random access memory (direct RAM).
  • the above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination.
  • the above-described embodiments may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded or executed on a computer, the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that contains one or more sets of available media.
  • the usable medium can be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium.
  • the semiconductor medium can be a solid state hard drive.
  • the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not be applied to the embodiment of the present application.
  • the implementation process constitutes any limitation.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de transmission de données, permettant la définition préalable d'une relation de mise en correspondance entre une ressource pour un signal de référence de démodulation et un système de transmission, ce qui aide un dispositif d'extrémité de réception à déterminer des systèmes de transmission d'autres dispositifs d'extrémité de réception. Selon le procédé, un dispositif d'extrémité de transmission : code préalablement un signal de référence de démodulation pour obtenir un signal de référence de démodulation codé préalablement, une ressource pour le signal de référence de démodulation étant associée à un système de transmission d'un flux de données correspondant au signal de référence de démodulation ; et transmet le signal de référence de démodulation codé préalablement à un premier dispositif d'extrémité de réception.
PCT/CN2018/079806 2017-03-24 2018-03-21 Procédé et appareil de transmission de données WO2018171624A1 (fr)

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