WO2018228144A1 - 发送和接收参考信号的方法、网络设备和终端设备 - Google Patents

发送和接收参考信号的方法、网络设备和终端设备 Download PDF

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Publication number
WO2018228144A1
WO2018228144A1 PCT/CN2018/087789 CN2018087789W WO2018228144A1 WO 2018228144 A1 WO2018228144 A1 WO 2018228144A1 CN 2018087789 W CN2018087789 W CN 2018087789W WO 2018228144 A1 WO2018228144 A1 WO 2018228144A1
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Prior art keywords
precoding
reference signal
terminal device
network device
polling
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PCT/CN2018/087789
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English (en)
French (fr)
Inventor
吴晔
金黄平
韩玮
毕晓艳
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP18818231.5A priority Critical patent/EP3627881B1/en
Publication of WO2018228144A1 publication Critical patent/WO2018228144A1/zh
Priority to US16/710,410 priority patent/US10911122B2/en

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    • 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
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present application relates to the field of wireless communications, and more particularly to a method, network device and terminal device for transmitting and receiving reference signals.
  • the network device may perform calculation and selection of a precoding matrix according to channel state information (CSI) fed back by the terminal device.
  • CSI channel state information
  • the feedback of the terminal device depends on the measurement of the channel state information reference signal (CSI-RS). Therefore, the current technology considers using the beamformed CSI-RS for CSI measurement to obtain the terminal.
  • the feedback of the device can achieve the effect of reducing pilot overhead and channel measurement accuracy.
  • the beamformed CSI-RS is often a CSI measurement for an equivalent channel corresponding to a certain precoding matrix, and the terminal device performs CSI measurement based on the beamformed CSI-RS, that is, corresponding to the precoding matrix.
  • the CSI is equivalent to the channel measurement and feedback. Therefore, the CSI measurement method is not flexible enough, which greatly limits the flexibility and spatial freedom of network equipment scheduling.
  • the present application provides a method, a network device, and a terminal device for transmitting and receiving a reference signal to perform CSI measurement using more precoding vectors (or precoding matrices) to obtain a measurement effect of more equivalent channels.
  • a method of transmitting a reference signal comprising:
  • the network device performs precoding polling on the first reference signal by using at least two precoding vectors to obtain a precoded first reference signal, where the precoded first reference signal is carried by multiple physical resource groups, and any The signals carried by two adjacent physical resource groups correspond to different precoding vectors;
  • the network device sends the pre-coded first reference signal to the terminal device by using the multiple physical resource groups, where the first reference signal is used by the terminal device to perform CSI measurement of a downlink channel.
  • the first reference signal is precoded and polled by the network device by using at least two precoding vectors, and the CSI measurement is performed on the first reference signal by using at least two precoding vectors, that is, different from The measurement of the equivalent channel corresponding to the precoding vector, thereby obtaining the measurement effect of different equivalent channels.
  • a precoding vector is precoded for a reference signal on a measurement bandwidth to obtain a certain preamble.
  • the technical solution of the present application can obtain more measurement results, which is beneficial to improve the flexibility and spatial freedom of network device scheduling; on the other hand, the transmission for precoding polling
  • the scheme provides a precoding matrix for polling to ensure reliable transmission of data and improve the robustness of the transmission system.
  • the first reference signal is precoded by using precoding polling, compared with In the case of non-polling, the channel can be measured more fairly, since the resources that are closer to each other are used differently.
  • the precoding vector is measured, that is, different precoding vectors are used for the same resource to measure, and the same precoding vector is used to measure once every other frequency, that is, it is measured at a small granularity of each bandwidth.
  • the measured measurement results are more accurate, which is more conducive to the reliable transmission of data, and is beneficial to improve the robustness of the transmission system.
  • the network device may perform precoding polling on the multiple reference signals by using at least two precoding matrices, thereby obtaining corresponding to different precoding matrices.
  • the equivalent channel measurement effect may be understood that, for multiple reference signals carried in the multiple physical resource groups.
  • the network device performs precoding polling on the first reference signal by using at least two precoding vectors, including:
  • the network device performs precoding polling on the first reference signal by using the at least two precoding vectors based on each parameter in the precoding polling parameter set.
  • all or part of the parameters in the precoding polling parameter group may be predefined, or may be notified by the network device to notify the terminal device.
  • At least one parameter in the precoding polling parameter group is pre-configured in the network device and the terminal device.
  • the precoding polling parameter group is pre-configured in the network device and the terminal device, the signaling overhead caused by the indication information can be reduced.
  • the method further includes:
  • the network device sends first indication information to the terminal device, where the first indication information includes: an index of a precoding polling parameter group, or at least one parameter in a precoding polling parameter group.
  • the parameters in the precoding polling parameter can be dynamically adjusted, which is more flexible than the method of predefining the precoding polling parameter described above. .
  • the first indication information may be carried in at least one of the following messages:
  • Radio resource control (RRC) message media access control (MAC) control element (CE), and downlink control information (DCI).
  • RRC Radio resource control
  • MAC media access control
  • CE control element
  • DCI downlink control information
  • the first indication information is carried by any one of the foregoing signalings, and dynamic adjustment of the precoding polling parameters can be implemented.
  • the method further includes:
  • the network device sends resource configuration information to the terminal device, where the resource configuration information is used to indicate a time-frequency resource that carries the pre-coded first reference signal.
  • the resource configuration information includes any one of the following:
  • the resource configuration information of the multiple reference signals carried in the resource set, where the resource set includes the multiple physical resource groups, and the multiple reference signals carried in the resource set correspond to the same precoding polling parameters.
  • the method further includes:
  • the network device sends CSI reporting setting information to the terminal device, where the CSI reporting configuration information is used to indicate the CSI that the terminal device needs to report.
  • the method further includes:
  • the network device sends CSI measurement setting information to the terminal device, where the CSI measurement configuration information is used to indicate a correspondence between the resource configuration information and the CSI report configuration information.
  • the CSI measurement configuration information includes at least one of the following: a CSI, a resource configuration indication, a quantity of a channel to be measured, a channel to be measured interference, and a CSI report configuration indication.
  • the first indication information is configured in at least one of the following: the resource configuration information, the CSI report configuration information, or the CSI measurement configuration information.
  • At least one parameter in the precoding polling parameter group may be indicated by an indication field in any one of the above information, or an index of the precoding polling parameter group.
  • the method further includes:
  • the network device sends the second indication information to the terminal device, where the second indication information is used to indicate whether the pre-coded first reference signal adopts a pre-encoding polling mode.
  • the second indication information is carried in at least one of the following messages: an RRC message, a MAC CE, and a DCI.
  • the second indication information is configured in at least one of the following: the resource configuration information, the CSI report configuration information, or the CSI measurement configuration information.
  • the resource configuration information may be carried in any one of the following messages: an RRC message, a MAC CE, or a DCI.
  • the CSI report configuration information may be carried in any one of the following messages: an RRC message, a MAC CE, or a DCI.
  • the CSI measurement configuration information may be carried in any one of the following messages: an RRC message, a MAC CE, or a DCI.
  • a method of receiving a reference signal including:
  • the terminal device receives the pre-coded first reference signal sent by the network device by using multiple physical resource groups, and the precoding vector corresponding to the signal carried by any two adjacent physical resource groups is different;
  • the terminal device performs channel state information CSI measurement of the downlink channel according to the precoded first reference signal.
  • the first reference signal is precoded and polled by the network device by using at least two precoding vectors, and the CSI measurement is performed on the first reference signal by using at least two precoding vectors, that is, different from The measurement of the equivalent channel corresponding to the precoding vector, thereby obtaining the measurement effect of different equivalent channels.
  • a precoding vector is precoded for a reference signal on a measurement bandwidth to obtain a certain preamble.
  • the technical solution of the present application can obtain more measurement results, which is beneficial to improve the flexibility and spatial freedom of network device scheduling; on the other hand, the transmission for precoding polling
  • the scheme provides a precoding matrix for polling to ensure reliable transmission of data and improve the robustness of the transmission system.
  • the first reference signal is precoded by using precoding polling, compared with In the case of non-polling, the channel can be measured more fairly, since the resources that are closer to each other are used differently.
  • the coding vector is measured, that is, different precoding vectors are used for the same resource to measure, and the same precoding vector is used to measure once every other frequency, that is, it is measured at a small granularity of each bandwidth, thereby measuring
  • the obtained measurement result is more accurate, which is more conducive to reliable transmission of data, and is beneficial to improving the robustness of the transmission system.
  • the network device may perform precoding polling on the multiple reference signals by using at least two precoding matrices, thereby obtaining corresponding to different precoding matrices.
  • the equivalent channel measurement effect may be understood that, for multiple reference signals carried in the multiple physical resource groups.
  • the terminal device performs CSI measurement of the downlink channel according to the pre-coded first reference signal, including:
  • the terminal device performs CSI measurement of the downlink channel according to each parameter in the precoding polling parameter group and the precoded first reference signal.
  • all or part of the parameters in the precoding polling parameter group may be predefined, or may be notified by the network device to notify the terminal device.
  • At least one parameter of the precoding polling parameter group is pre-configured in the terminal device and the network device.
  • the precoding polling parameter group is pre-configured in the network device and the terminal device, the signaling overhead caused by the indication information can be reduced.
  • the method further includes:
  • the terminal device receives the first indication information that is sent by the network device, where the first indication information includes: an index of a precoding polling parameter group, or at least one parameter in a precoding polling parameter group.
  • the parameters in the precoding polling parameter can be dynamically adjusted, which is more flexible than the method of predefining the precoding polling parameter described above. .
  • the first indication information may be carried in at least one of the following messages:
  • Radio resource control (RRC) message media access control (MAC) control element (CE), and downlink control information (DCI).
  • RRC Radio resource control
  • MAC media access control
  • CE control element
  • DCI downlink control information
  • the first indication information is carried by any one of the foregoing signalings, and dynamic adjustment of the precoding polling parameters can be implemented.
  • the method further includes:
  • the terminal device receives the resource configuration information sent by the network device, where the resource configuration information is used to indicate a time-frequency resource that carries the pre-coded first reference signal.
  • the resource configuration information includes any one of the following:
  • the resource configuration information of the multiple reference signals carried in the resource set, where the resource set includes the multiple physical resource groups, and the multiple reference signals carried in the resource set correspond to the same precoding polling parameters.
  • the method further includes:
  • the terminal device receives the CSI report configuration information sent by the network device, where the CSI report configuration information is used to indicate the CSI that the terminal device needs to report.
  • the method further includes:
  • the CSI measurement configuration information is used to indicate a correspondence between the resource configuration information and the CSI report configuration information.
  • the CSI measurement configuration information includes at least one of the following: a CSI, a resource configuration indication, a quantity of a channel to be measured, a channel with measurement interference, and a CSI report configuration indication.
  • At least one parameter in the precoding polling parameter group may be indicated by an indication field in any one of the above information, or an index of the precoding polling parameter group.
  • the method further includes:
  • the terminal device receives the second indication information that is sent by the network device, where the second indication information is used to indicate whether the pre-coded first reference signal adopts a pre-encoding polling mode.
  • the second indication information is carried in at least one of the following messages: an RRC message, a MAC CE, and a DCI.
  • the second indication information is configured in at least one of the following: the resource configuration information, the CSI report configuration information, or the CSI measurement configuration information.
  • the resource configuration information may be carried in any one of the following messages: an RRC message, a MAC CE, or a DCI.
  • the CSI report configuration information may be carried in any one of the following messages: an RRC message, a MAC CE, or a DCI.
  • the CSI measurement configuration information may be carried in any one of the following messages: an RRC message, a MAC CE, or a DCI.
  • a method of transmitting a reference signal including:
  • the terminal device performs precoding polling on the second reference signal by using at least two precoding vectors to obtain a precoded second reference signal, where the precoded second reference signal is carried by multiple physical resource groups, and is arbitrarily The signals carried by two adjacent physical resource groups correspond to different precoding vectors;
  • the terminal device sends the precoded second reference signal to the network device, where the second reference signal is used by the network device to perform channel state information CSI measurement of an uplink channel.
  • the terminal device performs precoding polling on the second reference signal by using at least two precoding vectors, so that CSI measurement can be performed on the second reference signal by using at least two precoding vectors, that is, different from The measurement of the equivalent channel corresponding to the precoding vector, thereby obtaining the measurement effect of different equivalent channels.
  • the CSI of the uplink channel measured by the network device may be used to indicate to the terminal device, so that the terminal device performs uplink transmission, and the CSI of the downlink channel may be determined by channel reciprocity to facilitate downlink transmission.
  • the technical solution of the present application can obtain more measurement results, which is beneficial to improve flexibility and spatial freedom of network device scheduling; on the other hand, a transmission scheme for precoding polling Providing a precoding matrix for polling, ensuring reliable transmission of data, and improving robustness of the transmission system; on the other hand, precoding the second reference signal by means of precoding polling, compared to non- In the case of polling, the channel can be measured more fairly, since the two relatively close resources are measured by different precoding vectors, that is, different precoding vectors are used for the same resource to measure, and every A frequency is measured once using the same precoding vector, that is, it is measured at a small granularity of each bandwidth, so that the measured measurement result is more accurate, which is more conducive to reliable transmission of data, and is advantageous for improving the robustness of the transmission system. .
  • the network device may perform precoding polling on the multiple reference signals by using at least two precoding matrices, thereby obtaining corresponding to different precoding matrices.
  • the equivalent channel measurement effect may be understood that, for multiple reference signals carried in the multiple physical resource groups.
  • the terminal device performs precoding polling on the second reference signal by using at least two precoding vectors, including:
  • the terminal device performs precoding polling on the second reference signal by using the at least two precoding vectors based on each parameter in the precoding polling parameter group.
  • all or part of the parameters in the precoding polling parameter group may be predefined, or may be notified by the network device to notify the terminal device.
  • At least one parameter in the precoding polling parameter group is pre-configured in the network device and the terminal device.
  • the precoding polling parameter group is pre-configured in the network device and the terminal device, the signaling overhead caused by the indication information can be reduced.
  • the method further includes:
  • the terminal device receives the third indication information that is sent by the network device, where the third indication information includes: an index of a precoding polling parameter group, or at least one parameter in a precoding polling parameter group.
  • the parameters in the precoding polling parameter can be dynamically adjusted, which is more flexible than the method of predefining the precoding polling parameter described above. .
  • the third indication information may be carried in at least one of the following messages: an RRC message, a MAC CE, or a DCI.
  • the first indication information is carried by any one of the foregoing signalings, and dynamic adjustment of the precoding polling parameters can be implemented.
  • the method further includes:
  • the terminal device receives the resource configuration information sent by the network device, where the resource configuration information is used to indicate a time-frequency resource that carries the pre-coded second reference signal.
  • the resource configuration information includes any one of the following:
  • the resource configuration information of the multiple reference signals carried in the resource set, where the resource set includes the multiple physical resource groups, and the multiple reference signals carried in the resource set correspond to the same precoding polling parameters.
  • the third indication information is configured in the resource configuration information.
  • the indication field in the resource configuration information indicates at least one parameter in the precoding polling parameter group, or the index of the precoding polling parameter group.
  • the method further includes:
  • the terminal device receives fourth indication information that is sent by the network device, where the fourth indication information is used to indicate whether the terminal device adopts a precoding polling mode.
  • the fourth indication information is carried in at least one of the following messages: an RRC message, a MAC CE, and a DCI.
  • the fourth indication information is configured in the resource configuration information.
  • the resource configuration information may be carried in any one of the following messages: an RRC message, a MAC CE, or a DCI.
  • the second reference signal may be used by the network device to perform CSI measurement of the uplink channel, or may use channel reciprocity for CSI determination of the downlink channel in time division depluxing (TDD) mode.
  • TDD time division depluxing
  • the method further includes:
  • the terminal device receives the CSI of the uplink channel sent by the network device, and the CSI of the uplink channel is obtained by the network device by performing CSI measurement based on the precoded second reference signal.
  • a method for receiving a reference signal including:
  • the network device receives the pre-coded second reference signal sent by the terminal device by using multiple physical resource groups, and the precoding vectors corresponding to the signals carried by any two adjacent physical resource groups are different;
  • the network device performs CSI measurement of the uplink channel according to the precoded second reference signal.
  • the terminal device performs precoding polling on the second reference signal by using at least two precoding vectors, so that CSI measurement can be performed on the second reference signal by using at least two precoding vectors, that is, different from The measurement of the equivalent channel corresponding to the precoding vector, thereby obtaining the measurement effect of different equivalent channels.
  • the CSI of the uplink channel measured by the network device may be used to indicate to the terminal device, so that the terminal device performs uplink transmission, and the CSI of the downlink channel may be determined by channel reciprocity to facilitate downlink transmission.
  • the technical solution of the present application can obtain more measurement results, which is beneficial to improve flexibility and spatial freedom of network device scheduling; on the other hand, a transmission scheme for precoding polling Providing a precoding matrix for polling, ensuring reliable transmission of data, and improving robustness of the transmission system; on the other hand, precoding the second reference signal by means of precoding polling, compared to non- In the case of polling, the channel can be measured more fairly, since the two relatively close resources are measured by different precoding vectors, that is, different precoding vectors are used for the same resource to measure, and every A frequency is measured once using the same precoding vector, that is, it is measured at a small granularity of each bandwidth, so that the measured measurement result is more accurate, which is more conducive to reliable transmission of data, and is advantageous for improving the robustness of the transmission system. .
  • the network device may perform precoding polling on the multiple reference signals by using at least two precoding matrices, thereby obtaining corresponding to different precoding matrices.
  • the equivalent channel measurement effect may be understood that, for multiple reference signals carried in the multiple physical resource groups.
  • the network device performs CSI measurement of the uplink channel according to the precoded second reference signal, including:
  • the network device performs CSI measurement of the uplink channel according to each parameter in the precoding polling parameter group and the precoded second reference signal.
  • all or part of the parameters in the precoding polling parameter group may be predefined, or may be notified by the network device to notify the terminal device.
  • the precoding polling parameter set includes at least: a number of precoding vectors and a granularity of precoding polling.
  • the precoding polling parameter group is pre-configured in the network device and the terminal device, the signaling overhead caused by the indication information can be reduced.
  • the method further includes:
  • the network device sends third indication information to the terminal device, where the third indication information includes: an index of a precoding polling parameter group, or at least one parameter in a precoding polling parameter group.
  • the parameters in the precoding polling parameter can be dynamically adjusted, which is more flexible than the method of predefining the precoding polling parameter described above. .
  • the third indication information may be carried in at least one of the following messages: an RRC message, a MAC CE, or a DCI.
  • the first indication information is carried by any one of the foregoing signalings, and dynamic adjustment of the precoding polling parameters can be implemented.
  • the method further includes:
  • the network device sends resource configuration information to the terminal device, where the resource configuration information is used to indicate a time-frequency resource that carries the pre-coded second reference signal.
  • the resource configuration information includes any one of the following:
  • the resource configuration information of the multiple reference signals carried in the resource set, where the resource set includes the multiple physical resource groups, and the multiple reference signals carried in the resource set correspond to the same precoding polling parameters.
  • the third indication information is configured in the resource configuration information.
  • the indication field in the resource configuration information indicates at least one parameter in the precoding polling parameter group, or the index of the precoding polling parameter group.
  • the method further includes:
  • the network device sends fourth indication information to the terminal device, where the fourth indication information is used to indicate whether the terminal device adopts a precoding polling mode.
  • the fourth indication information is carried in at least one of the following messages: an RRC message, a MAC CE, and a DCI.
  • the fourth indication information is configured in the resource configuration information.
  • the resource configuration information may be carried in any one of the following messages: an RRC message, a MAC CE, or a DCI.
  • the second reference signal may be used by the network device to perform CSI measurement of the uplink channel, or may use channel reciprocity for CSI determination of the downlink channel in time division depluxing (TDD) mode.
  • TDD time division depluxing
  • the method further includes:
  • the network device sends the CSI of the uplink channel to the terminal device, where the CSI of the uplink channel is obtained by the network device based on the pre-coded second reference signal for CSI measurement.
  • the method further includes:
  • the network device determines CSI of the downlink channel according to the CSI of the uplink channel, where the CSI of the uplink channel is obtained by the network device based on the pre-coded second reference signal for CSI measurement.
  • a network device comprising various modules for performing the method of transmitting a reference signal in the first aspect or any of the possible implementations of the first aspect.
  • a terminal device comprising various modules for performing the method of receiving a reference signal in any of the possible implementations of the second aspect or the second aspect.
  • a terminal device comprising various modules for performing a method of transmitting a reference signal in any of the possible implementations of the third aspect or the third aspect.
  • a network device comprising means for performing the method of receiving a reference signal in any of the possible implementations of the fourth aspect or the fourth aspect.
  • a network device including a transceiver, a processor, and a memory.
  • the processor is configured to control a transceiver transceiver signal for storing a computer program for calling and running the computer program from the memory, such that the network device performs the first aspect and any one of the possible implementations of the first aspect
  • a terminal device including a transceiver, a processor, and a memory.
  • the processor is configured to control a transceiver transceiver signal for storing a computer program, the processor for calling and running the computer program from the memory, such that the terminal device performs the second aspect and any possible implementation manner of the second aspect
  • the method of the third aspect and the method of any of the third aspect and the third aspect are provided, including a transceiver, a processor, and a memory.
  • the processor is configured to control a transceiver transceiver signal for storing a computer program, the processor for calling and running the computer program from the memory, such that the terminal device performs the second aspect and any possible implementation manner of the second aspect.
  • a communication device which may be a network device in the above method design, or a chip disposed in a network device.
  • the communication device includes: a processor coupled to the memory, and configured to execute the instructions in the memory to implement the method performed by the network device in any one of the first aspect or the first aspect of the first aspect, or the fourth aspect and A method of any of the possible implementations of the fourth aspect.
  • the communication device further comprises a memory.
  • the communication device further includes a communication interface, the processor being coupled to the communication interface.
  • the communication interface may be a transceiver, or an input/output interface.
  • the communication interface may be an input/output interface.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • a communication device which may be a terminal device in the above method design, or a chip disposed in the terminal device.
  • the communication device includes a processor coupled to the memory and operable to execute instructions in the memory to implement the method performed by the terminal device in any one of the possible implementation manners of the second aspect or the second aspect, or the third aspect and A method of any of the possible implementations of the third aspect.
  • the communication device further comprises a memory.
  • the communication device further includes a communication interface, the processor being coupled to the communication interface.
  • the communication interface may be a transceiver, or an input/output interface.
  • the communication interface may be an input/output interface.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • processor may be implemented by hardware or by software.
  • the processor may be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor may be A general-purpose processor is implemented by reading software code stored in a memory, which can be integrated in the processor and can exist independently of the processor.
  • a computer program product comprising: computer program code, when the computer program code is executed by a network device, causing the network device to perform the first aspect and the first aspect described above.
  • a computer program product comprising: computer program code, when the computer program code is executed by a terminal device, causing the terminal device to perform the second aspect and the second aspect A method in any of the possible implementations, or a method in any of the possible implementations of the third aspect and the third aspect.
  • a fifteenth aspect a computer readable medium storing program code, the program code comprising the first aspect to the fourth aspect or the first to fourth aspects An instruction of a method in a possible implementation.
  • the precoding polling parameter set includes at least: a number of precoding vectors and The granularity of precoding polling.
  • the number of the precoding vectors indicates that the precoded first reference signals carried in the multiple physical resource groups are precoded based on several different precoding vectors.
  • the precoding polling parameter set includes at least: a number of precoding matrices and a granularity of precoding polling.
  • the number of the precoding matrices indicates that the precoded plurality of reference signals carried in the multiple physical resource groups are precoded based on several different precoding matrices.
  • the precoder cycling granularity also referred to as the precoder cycling size, indicates the number of resource units included in each physical resource group.
  • a resource unit may be a resource block (RB) or a resource block group (RB group) defined in an existing protocol (for example, a Long Time Evolution (LTE) protocol).
  • RB resource block
  • RB group resource block group defined in an existing protocol (for example, a Long Time Evolution (LTE) protocol).
  • LTE Long Time Evolution
  • the plurality of physical resource groups are continuously distributed or discretely distributed within a system bandwidth.
  • the present application performs precoding polling on the same reference signal by using at least two precoding vectors, and more precoding vectors (or precoding matrices) can be used for CSI measurement to obtain more equivalent channel measurement effects. It is conducive to improving the flexibility and spatial freedom of network scheduling.
  • FIG. 1 is a schematic diagram of a communication system suitable for a method of transmitting and receiving a reference signal according to 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 transmitting and receiving a reference signal according to an embodiment of the present invention
  • 4 is a schematic diagram of correspondence between multiple physical resource groups and at least two precoding matrices
  • 5 is a schematic diagram of distribution of multiple physical resource groups within a system bandwidth
  • FIG. 6 is another schematic diagram of distribution of multiple physical resource groups within a system bandwidth
  • FIG. 7 is a schematic flowchart of a method for transmitting and receiving a reference signal according to another embodiment of the present invention.
  • FIG. 8 is a schematic block diagram of a network device according to an embodiment of the present invention.
  • FIG. 9 is a schematic block diagram of a terminal device according to an embodiment of the present invention.
  • FIG. 10 is a schematic block diagram of a terminal device according to another embodiment of the present invention.
  • FIG. 11 is a schematic block diagram of a network device according to another embodiment of the present invention.
  • FIG. 12 is another schematic block diagram of a network device according to an embodiment of the present invention.
  • FIG. 13 is another schematic block diagram of a terminal device according to an embodiment of the present invention.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Time Evolution
  • LTE-A Advanced Long Term Evolution
  • UMTS Universal Mobile Telecommunication System
  • next-generation communication system for example, fifth-generation (5G) system
  • NR new radio access technology
  • 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 may be a base station (Base Transceiver Station, BTS) in Global System for Mobile Communications (GSM) or Code Division Multiple Access (CDMA), or a base station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA).
  • BTS Base Transceiver Station
  • GSM Global System for Mobile Communications
  • CDMA Code Division Multiple Access
  • NodeB, NB Wideband Code Division Multiple Access
  • TP transmission point
  • TRP transmission and reception point
  • base station a small base station device, and the like
  • TP transmission point
  • TRP transmission and reception point
  • base station a small base station device, and the like
  • 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 may also be referred to as a user equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, and a wireless communication.
  • 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, a user terminal, a terminal, and a wireless communication.
  • 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, a user terminal, a terminal, and a wireless communication.
  • Device user agent, or user device.
  • 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 antenna 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.
  • FIG. 2 is a schematic diagram of a downlink physical channel processing procedure used in an existing LTE system.
  • 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 a plurality of layers by layer mapping.
  • the symbol stream after the layer mapping may be referred to as a layer mapping space layer.
  • the layer mapping spatial layer is precoded to obtain a plurality of precoded data streams (or precoded symbol streams).
  • the precoded symbol stream is mapped to multiple REs via a resource particle (RE) map. These REs are then subjected to orthogonal frequency division multiplexing (OFDM) modulation to generate an OFDM symbol stream.
  • OFDM orthogonal frequency division multiplexing
  • the precoding technique may be that, in the case of a known channel state, the pre-processing is performed on the signal to be transmitted at the transmitting end, that is, the signal to be transmitted is processed by means of a precoding matrix matched with the channel resource, so that the pre-preprocessing is performed.
  • the coded signal to be transmitted is adapted to the channel such that the complexity of the interference between channels at the receiving end is reduced. Therefore, by precoding the transmitted signal, the received signal quality (for example, signal to interference plus noise ratio (SINR)) is improved. 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, multiple user multiple input multiple output (MU-MIMO) is implemented.
  • SINR signal to interference plus noise ratio
  • precoding may be performed by other means (for example, when the channel state cannot be known).
  • the precoding is performed by using a pre-set precoding matrix or a weighting processing method, and the details are not described herein.
  • the transmitting end In order to obtain a precoding matrix that can be adapted to the channel, the transmitting end generally performs channel state information (CSI) measurement by transmitting a reference signal, and obtains measurement feedback of the receiving end, thereby determining a relatively accurate precoding matrix.
  • the pre-encoding process is performed on the transmitted data.
  • the transmitting end may be a network device
  • the receiving end may be a terminal device
  • the reference signal may be a reference signal used for downlink channel measurement, for example, a channel state information reference signal (CSI-RS).
  • CSI-RS channel state information reference signal
  • the terminal device may perform CSI measurement according to the received CSI-RS, and feed back the CSI of the downlink channel to the network device; the transmitting end may also be a terminal device, and the receiving end may be a network device, and the reference signal may be used for uplink.
  • a reference signal for channel measurement for example, a sounding reference signal (SRS).
  • the network device may perform CSI measurement according to the received RSR, and indicate the CSI of the uplink channel to the terminal device.
  • the CSI may include, for example, a precoding matrix indicator (PMI), a rank indication (RI), and a channel quality indicator (CQI).
  • PMI precoding matrix indicator
  • RI rank indication
  • CQI channel quality indicator
  • the CSI-RS sent by the network device may be a non-precoded CSI-RS or a beamformed CSI-RS.
  • the uncoded CSI-RS can be used to measure the channel matrix, and the complete channel between the transmitting antenna and the receiving antenna measured by the terminal device.
  • the pilot overhead caused by channel measurement (specifically, CSI measurement) using unpre-coded CSI-RS is large, and each CSI-RS port is used.
  • the power is lower, the channel measurement accuracy is lower; and the beamformed CSI-RS can be used to measure the equivalent channel matrix, and the terminal device measures the beamformed equivalent channel, so the number of ports can be The reduction, the pilot overhead is small, and the channel measurement accuracy is high.
  • the terminal equipment can only perform CSI measurements on the equivalent channel corresponding to the precoding vector (or precoding matrix), which greatly limits the flexibility of network equipment scheduling and Space freedom.
  • the terminal device moves at a high speed, or the accurate CSI cannot be obtained, a relatively accurate precoding matrix cannot be obtained. Even if the beamformed CSI-RS is used, the terminal device can only obtain one PMI, and the precoding matrix determined by the PMI may not be compatible with the channel, so the signal to be transmitted obtained by the precoding process cannot be Accurately adapting to the current channel, resulting in a degradation of the received signal quality, and therefore, the reliability of data transmission cannot be guaranteed.
  • some new transmission schemes are proposed, which may include, for example, precoding polling, precoder cycling based transmit diversity, and the like.
  • the network device adopting the transmission scheme can perform precoding processing on the data in a polling manner to obtain diversity gain from multiple dimensions to improve signal reception quality and transmission reliability. If the above-mentioned unprecoded CSI-RS or beam-formed CSI-RS is still used for channel measurement, the terminal device can only feed back one PMI on the measurement bandwidth, and thus cannot provide the network device with a round for the network device.
  • the determination basis of the precoding matrix of the query makes it impossible for the network device to perform precoding polling, and thus the reliable transmission of the data cannot be guaranteed.
  • the present application proposes a method for transmitting and receiving reference signals.
  • more precoding vectors can be used for CSI measurement to obtain more equivalent channel measurement effects, thereby improving network device scheduling.
  • Flexibility and spatial freedom can provide a precoding matrix for polling for the precoding polling transmission scheme, thus ensuring reliable transmission of data and improving the robustness of the transmission system.
  • the wireless communication system can be the communication system 100 shown in FIG.
  • the communication system can include at least one network device and at least one terminal device, and the network device and the terminal device can communicate via a wireless air interface.
  • the network device in the communication system may correspond to the network device 102 shown in FIG. 1
  • the terminal device may correspond to the terminal device 116 or 122 shown in FIG.
  • the terminal device in order to support the multi-antenna technology, in the transmission mode before the transmission mode (TM) 9, the terminal device uses a cell-specific reference signal (CRS) as a channel.
  • CRS cell-specific reference signal
  • the measurement introduces a low-density resource distribution CSI-RS from the version 10 to replace the original CRS, thereby ensuring that the network device can perform multi-user scheduling according to the CSI reported by the terminal device.
  • the present application does not specifically limit the reference signal, whether it is a CSI-RS or a CRS, or other reference signals used for channel measurement defined in future protocols, for example, a demodulation reference signal used for channel measurement. (demodulation reference signal, DMRS) and the like.
  • the reference signal may be a reference signal used by the network device to measure the downlink channel (referred to as a first reference signal for convenience of distinction and description), or may be sent by the terminal device.
  • a reference signal for the network device for measuring the uplink channel (for convenience of distinction and description, denoted as a second reference signal).
  • the first reference signal may be a CSI-RS and the second reference signal may be a sounding reference signal (SRS).
  • first reference signal and the “second reference signal” are only reference signals named for distinguishing between uplink and downlink, and should not constitute any limitation to the present application, and correspondingly, “appears in the following"
  • the first time-frequency resource set and the second time-frequency resource set are resources for carrying reference signals named for distinguishing between uplink resources and downlink resources, and should not constitute any limitation to the present application.
  • a method for transmitting and receiving a reference signal provided by an embodiment of the present invention is described in detail below by using a network device to send a first reference signal to a terminal device and a terminal device to send a second reference signal to the network device.
  • FIG. 3 is a schematic flowchart of a method 300 for transmitting and receiving a first reference signal according to an embodiment of the present invention, which is shown from the perspective of device interaction. As shown, the method 300 illustrated in FIG. 3 can include steps 310 through 330. Method 300 is described in detail below in conjunction with FIG.
  • step 310 the network device performs precoding polling on the first reference signal by using at least two precoding vectors to obtain a precoded first reference signal.
  • the pre-coded first reference signal may be carried in multiple physical resource groups (or simply, resource groups), and each physical resource group may include at least one resource unit.
  • the resource unit can be understood as the minimum scheduling unit of the physical layer transmission.
  • Each resource unit may be, for example, an RB defined in the LTE protocol, or an RBG composed of multiple RB blocks, which is not specifically limited in this application.
  • the precoded first reference signal can be carried in multiple resource units.
  • the pre-coded first reference signal is carried in each resource element (RE) of the multiple resource units, and the resources in the multiple resource units are more specific. That is, RE) can also be used to carry data, other reference signals or other physical channels, which is not specifically limited in this application.
  • the RE for carrying the pre-coded first reference signal may be configured by the network device, and notify the terminal device of the location of the reference signal RE by using the resource configuration information.
  • the reference signal RE may also be determined by the network device according to the pilot pattern defined by the protocol and the port number of the first reference signal, and the port number of the first reference signal is notified to the terminal through the resource configuration information. a device for the terminal device to determine the reference signal RE.
  • the multiple physical resource groups may be referred to as a first time-frequency resource set.
  • the bandwidth occupied by the first time-frequency resource set may be referred to as the measurement bandwidth of the first reference signal.
  • the first time-frequency resource set may be a set of time-frequency resources configured by the network device to send the first reference signal.
  • the resources in the first time-frequency resource set are not limited to carrying one reference signal, and may also be used to carry multiple reference signals.
  • the at least one reference signal (which may be understood to include the first reference signal) carried in the first time-frequency resource set may be referred to as a reference signal group, and the first time-frequency resource set may be referred to as a reference signal resource.
  • a resource configured by a network device for transmitting one CSI-RS group may be referred to as a CSI-RS resource.
  • the reference signal and the antenna port may have a one-to-one correspondence.
  • the antenna port may also be referred to as a CSI-RS port, and one CSI-RS is a CSI-RS port.
  • each CSI-RS corresponds to one antenna port.
  • the resources configured for the multiple reference signals may be time division multiplexing (TDM) or frequency division multiplexing.
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • CDM code division multiply
  • the network device can distinguish different antenna ports by means of TDM, FDM, CDM, and the like. If FDM or TDM is used, the frequency domain resources or time domain resources occupied by the reference signals of different antenna ports may be different. If CDM is used, the time-frequency resources occupied by the reference signals of different antenna ports may be the same, and different antenna ports are distinguished by multiplexing codes.
  • the resource allocation manner of the at least one first reference signal carried in the first time-frequency resource set is not particularly limited.
  • the process of performing pre-coding processing on multiple reference signals by the network device may be the same, and the terminal device performs precoding on the received.
  • the measurement process of the plurality of reference signals may also be the same, and the process of precoding the plurality of reference signals by the network device may be performed simultaneously, and the terminal device pairs the received precoded plurality of reference signals.
  • the measurements can also be made simultaneously.
  • the precoding matrix corresponding to the plurality of reference signals carried in the first time-frequency resource set includes a precoding vector that is in one-to-one correspondence with the plurality of reference signals.
  • the network device when only one reference signal (for example, the first reference signal) is carried in the first time-frequency resource set, the network device pre-codes the first reference signal by using a precoding vector; when the first time-frequency resource is used
  • the network device when the plurality of reference signals (for example, the plurality of reference signals including the first reference signal) are carried in the set, the network device pre-codes the plurality of reference signals by using a precoding matrix, where the precoding matrix is used by each reference signal A corresponding precoding vector is combined.
  • the description of the same or similar cases will be omitted.
  • the specific process of transmitting and receiving the first reference signal is described by taking the processing procedure of the first reference signal as an example, and the present application is not limited in any way.
  • an antenna port can be understood as a beam-formed CSI-RS port, and a beam-formed CSI-RS is compared to a non-precoded CSI-RS port.
  • the number of ports is reduced, so that the pilot overhead can be reduced. Increase the transmit power of each port.
  • the network device uses at least two precoding vectors to precode the CSI-RS when performing precoding processing on the CSI-RS. Therefore, the equivalent channel corresponding to more precoding vectors can be measured to obtain the measurement effect of more equivalent channels, thereby facilitating the flexibility and spatial freedom of network device scheduling.
  • the network device can pre-code the first reference signal by using at least two precoding vectors.
  • the first reference signal corresponds to the same precoding vector in the same physical resource group, and the plurality of physical resource groups used to carry the first reference signal may correspond to at least two precoding vectors.
  • the network device may pre-code the first reference signal by using at least two precoding vectors in a polling manner.
  • the first reference signal corresponds to one and the same precoding vector
  • any two adjacent physical resource groups hereinafter, the adjacent physical resource groups are described in detail in conjunction with the drawings
  • the precoding vectors corresponding to the carried signals are different.
  • the number of multiple physical resource groups used to carry the first reference signal may be greater than or equal to the number of precoding vectors.
  • the network device may use at least two precoding matrices to reference the reference signal group carried in the first time-frequency resource set by means of polling.
  • the reference signal group includes the foregoing first reference. Signal
  • the reference signal group corresponds to an identical precoding matrix, and each precoding column vector corresponds to one reference signal, and the signal corresponding to the signal carried in any two adjacent physical resources is corresponding to any one of the physical resources.
  • the coding matrix is different.
  • the method that the network device performs precoding polling on the first reference signal by using at least two precoding vectors and the precoding polling of the reference signal group by using at least two precoding matrices is only one possible implementation. The method should not be construed as limiting the application.
  • CSI measurement may be performed on the first reference signal by using at least two precoding vectors (or precoding matrices) to obtain more equivalent channel measurements.
  • the technical solution of the present application is beneficial to improving the network device, as compared with the CSI that uses a precoding vector to precode a reference signal on a measurement bandwidth to obtain an equivalent channel corresponding thereto. Scheduling flexibility and spatial freedom.
  • the network device performs precoding polling on the first reference signal by using at least two precoding vectors based on each parameter in the precoding polling parameter set.
  • the precoding polling parameter set may include at least: a number of precoding vectors (or precoding matrices) and a granularity of precoding polling.
  • the number of precoding vectors may be the number of precoding vectors used for precoding the first reference signal.
  • the granularity of precoding polling which may also be referred to as the size of precoding polling, may indicate the number of resource elements included in one physical resource group, that is, the contiguous use of the same precoding vector (or precoding matrix).
  • the number of resource units If the resource unit is an RB, the granularity of the precoding polling may also be referred to as a precoding resource block group size (PRG size) or a polling PRG size.
  • a reference signal (ie, a first reference signal) is taken as an example to describe a correspondence between at least two precoding vectors and a plurality of physical resource groups, but this should not constitute any limitation on the present application.
  • the multiple physical resource groups may be used to carry multiple reference signals. If the multiple physical resource groups are used to carry multiple reference signals, the network device may adopt at least two pre-steps in step 210.
  • the coding matrix performs precoding polling on the plurality of reference signals.
  • each reference signal corresponds to a precoding vector
  • a plurality of reference signals correspond to a precoding matrix
  • the precoding matrix is a combination of precoding vectors corresponding to the plurality of reference signals.
  • the above precoding polling parameter set may include at least: the number of precoding matrices and the granularity of precoding polling.
  • the resources in the first time-frequency resource set carry n (n ⁇ 1, n is a natural number) first reference signals, and the n first reference signals are pre-predicted.
  • the number of precoding matrices used for coding polling is y (y ⁇ 2, y is a natural number), and the granularity of precoding polling is x (x ⁇ 1, x is a natural number).
  • the resource in the first time-frequency resource set carries two reference signals (for example, as shown in FIG. 4, the two reference signals respectively correspond to port #0 and port #1), and the network device adopts two precoding matrices. Precoding the two first reference signals for polling.
  • PRG#1 corresponds to precoding matrix #1
  • PRG#2 corresponds to precoding matrix #2
  • PRG#3 corresponds to precoding matrix #1
  • PRG#4 corresponds to precoding matrix #2 .
  • each pre-coding matrix may be a pre-coding matrix composed of two pre-coded column vectors. That is, in the same physical resource group, the two precoding column vectors are in one-to-one correspondence with the two first reference signals, and the network device performs precoding processing on each of the first reference signals by using the corresponding precoding vector.
  • the precoding vectors corresponding to different reference signals may be the same or different, which is not specifically limited in this application.
  • the pre-coding polling parameter of the first reference signal is used. It may include at least: the number of precoding vectors and the granularity of precoding polling.
  • multiple physical resource groups may be continuously distributed or discretely distributed within the system bandwidth.
  • the multiple physical resource groups may be distributed in some or all of the resources in the wideband, or may be distributed in one or more consecutive or Discontinuous subbands, or they may be distributed over one or more consecutive or discontinuous partial bands.
  • different resource configuration parameters number of resources in one bandwidth, for example, different subcarrier intervals, and part of the bandwidth may be partially continuous with the same resource configuration parameters.
  • frequency band That is, a broadband may contain multiple partial bandwidths, and resources within each partial bandwidth have the same resource configuration parameters.
  • the subband may refer to a definition in an existing protocol (for example, the LTE protocol), and a broadband may include multiple subbands, and multiple subbands within the broadband have the same resource numerology.
  • the subbands may also be defined in a partial bandwidth, which is distributed in the broadband, which is not specifically limited in this application.
  • Figure 5 illustrates the situation in which the plurality of physical resource groups are continuously distributed within the system bandwidth.
  • FIG. 5 shows an example in which the first reference signal is carried in four PRGs, and the four PRGs are continuously distributed within the system bandwidth. Therefore, PRG#1 and PRG#2, PRG#2, and PRG#3, Both PRG#3 and PRG#4 are adjacent physical resource groups. As can be seen from the figure, the precoding matrices corresponding to any two adjacent physical resource groups are different.
  • the plurality of physical resource groups may be distributed in a part of the discontinuous resources in the broadband, or may be distributed in multiple discontinuous sub-bands, or Distributed over a discrete portion of the bandwidth.
  • Figure 6 illustrates the situation in which the plurality of physical resource groups are discretely distributed within the system bandwidth.
  • PRG #1 to PRG#4 are continuously distributed in one subband (for example, Subband 1)
  • PRG#5 and PRG#6 are continuously distributed in another subband (for example, subband 2), but subband 1 and subband 2 are not continuous.
  • PRG#1 and PRG# can be considered.
  • PRG #2 and PRG #3, PRG #3 and PRG #4, PRG #4 and PRG #5, and PRG #5 and PRG #6 are respectively adjacent physical resource groups.
  • the precoding matrices corresponding to any two adjacent physical resource groups are different. Therefore, it can be understood that any two adjacent physical resource groups described above are not necessarily continuously distributed on physical resources.
  • step 320 the network device sends the pre-coded first reference signal to the terminal device by using the multiple physical resource groups.
  • the terminal device receives the pre-coded first reference signal sent by the network device on the multiple physical resource groups.
  • the network device may map the precoded first reference signal to the corresponding RE to pass the physical The resource is transmitted to the terminal device.
  • the correspondence between the multiple physical resource groups and the precoding vector may be pre-configured by the network device, for example, as shown in FIG. 5 or FIG. 6, PRG#1, PRG#3, and PRG# 5 corresponds to precoding vector #1, PRG#2, PRG#4, and PRG#6 correspond to precoding vector #2.
  • the network device may notify the terminal device of the resource configuration information, so that the terminal device receives the pre-coded first reference signal on the corresponding physical resource.
  • the method 300 further includes:
  • the network device sends resource configuration information to the terminal device, where the resource configuration information is used to carry the time-frequency resource of the first reference signal.
  • step 330 the terminal device performs CSI measurement of the downlink channel according to the received pre-coded first reference signal.
  • the specific process of the CSI measurement performed by the terminal device according to the received pre-coded first reference signal may be similar to the specific process of the CSI measurement performed by the terminal device in the prior art. For the sake of brevity, the CSI measurement of the terminal device is omitted here. A description of the specific process. It should be noted that the pre-coded first reference signal received by the terminal device is obtained by precoding polling using at least two precoding vectors, and therefore, different precoding vectors can be measured and different. Equivalent channel matrix.
  • the terminal device may perform CSI measurement of the downlink channel based on each parameter in the precoding polling parameter group and the received precoded first reference signal.
  • the terminal device may obtain the parameters in the precoding polling parameter group in any one of the following manners:
  • Manner 1 The at least one parameter in the precoding polling parameter group is pre-configured in the network device and the terminal device;
  • Manner 2 The network device sends the indication information of the precoding polling parameter to the terminal device (for the purpose of distinguishing and explaining, the first indication information is recorded).
  • At least one parameter in the precoding polling parameter set may be predefined, for example, defined in a protocol.
  • the pre-defined at least one parameter may be pre-configured in the network device and the terminal device.
  • the predefined at least one parameter may be pre-stored in the memory of the network device and the terminal device, respectively, so that the network device and the terminal device are respectively performing.
  • the pre-defined parameters are obtained from the memory in the corresponding step.
  • all parameters in the precoding polling parameter group may be pre-defined in the protocol, and the network device may perform precoding polling on the first reference signal based on the parameters in the precoding polling parameter group, and the terminal device may be based on the Precoding the parameters in the polling parameter group, and dividing the time-frequency resource carrying the pre-coded first reference signal to obtain multiple resource groups (it can be understood that the multiple resource groups correspond to at least two precoding vectors) And then performing CSI measurement on the received pre-coded first reference signal to obtain a plurality of equivalent channel matrices corresponding one-to-one with the plurality of resource groups.
  • the network device may predetermine the precoding polling granularity x before performing precoding polling on the first reference signal, and perform the first reference signal based on the precoding polling number y and the precoding polling granularity x.
  • Precode polling In this case, mode one can be used in combination with mode two.
  • the network device may further send the indication information of the precoding polling granularity x (ie, an example of the first indication information) to the terminal device, and the terminal device receives the precoded first reference signal and the pre
  • the time-frequency resource carrying the pre-coded first reference signal may be according to the pre-defined precoding polling number y and the precoding polling granularity x indicated by the indication information. Dividing, obtaining a plurality of resource groups, and performing CSI measurement according to the received pre-coded first reference signal, to obtain a plurality of equivalent channel matrices corresponding to the plurality of resource groups.
  • At least one parameter in the precoding polling parameter group may be determined by the network device, and the terminal device is notified by the first indication information.
  • the network device sends first indication information to the terminal device, where the first indication information includes: an index of a precoding polling parameter group, or at least one parameter in a precoding polling parameter group.
  • the specific content that the network device sends the first indication information to the terminal device may be any one of the following:
  • the network device may notify the terminal device of the index of the precoding polling parameter group by using the first indication information, so as to reduce the overhead caused by the indication information; or the network device may directly notify the terminal device of the precoding polling parameter. To reduce the memory overhead caused by the terminal device to pre-save the one-to-one correspondence between the precoding polling parameter group and the index.
  • the plurality of precoding polling parameter groups may be defined by a protocol, and the one-to-one correspondence between the plurality of precoding polling parameter groups and the index is pre-stored in the network device and the terminal device; or, the multiple The one-to-one correspondence between the pre-encoding polling parameter group and the index may be pre-defined and saved by the network device, and the terminal device may obtain a one-to-one correspondence between the plurality of pre-encoding polling parameter groups and the index from the network device, when the network device adopts In any one of the plurality of precoding polling parameter groups, the index of the adopted parameter group may be indicated to the terminal device by using the first indication information.
  • the specific method for the network device to send the first indication information to the terminal device may include any one of the following:
  • the network device sends a radio resource control (RRC) message to the terminal device, where the RRC message carries the first indication information;
  • RRC radio resource control
  • the network device sends a media access control (MAC) control element (CE) to the terminal device, where the MAC CE carries the first indication information; or
  • MAC media access control
  • CE control element
  • the network device sends a physical downlink control channel (PDCCH) to the terminal device, where the PDCCH carries the first indication information.
  • the first indication information is carried in a DCI in the PDCCH.
  • the first indication information may include two pieces of information, which are respectively carried in the RRC message and the DCI.
  • the network device may send, by using an RRC message, a one-to-one correspondence between the plurality of precoding polling parameter groups and the index to the terminal device, where the multiple precoding polling parameter groups may be pre-defined all or part of the network device. Encoding the polling parameter group, when the network device uses any one of the parameter groups to perform precoding polling on the first reference signal, the network device sends the first indication information to the terminal device by using the DCI, to indicate to the terminal device that the The index of the parameter group.
  • the first indication information may be configured in resource configuration information sent by the network device to the terminal device.
  • the resource configuration information is used to indicate to the terminal device the time-frequency resource that carries the pre-coded first reference signal, and the terminal device can receive the pre-coded first reference on the corresponding time-frequency resource according to the resource configuration information. signal.
  • the resource configuration information may include any one of the following:
  • a resource configuration information of the plurality of reference signals carried in the reference signal resource group where the reference signal resource group includes the plurality of physical resource groups, and the plurality of reference signals carried in the reference signal resource group correspond to the same precoding polling parameter.
  • the information included in the resource configuration information may be any one of the above a, b, and c.
  • the network device may send corresponding resource configuration information for each reference signal. That is to say, there is a one-to-one correspondence between the reference signal, the resource configuration information of the reference signal, and the precoding polling parameters of the reference signal.
  • the network device may send resource configuration information for multiple reference signals carried in the same physical resource group.
  • the same physical resource group may be the multiple physical resource groups. Therefore, the multiple reference signals carried in the multiple physical resource groups include the first reference signal. That is, the time-frequency resources of the plurality of reference signals in the same physical resource group may be determined according to one resource configuration information, and since the plurality of physical resource groups are one reference signal resource, the reference signal resources are more The precoding polling parameters of the reference signal configurations may be the same.
  • the network device may send resources to multiple reference signals carried in a reference signal resource group (for example, a CSI-RS resource set) including the multiple physical resource groups.
  • a reference signal resource group for example, a CSI-RS resource set
  • Configuration information since the plurality of physical resource groups carry the first reference signal, the multiple reference signals carried in the resource set include the first reference signal.
  • the precoding polling parameters configured by the plurality of reference signals carried by the physical resource group in the reference signal resource group may be the same.
  • the specific method for the network device to send the first indication information to the terminal device may include any one of the following:
  • the network device sends an RRC message to the terminal device, where the RRC message includes resource configuration information, where the resource configuration information carries the first indication information;
  • the network device sends a MAC CE to the terminal device, where the MAC CE includes resource configuration information, where the resource configuration information carries the first indication information;
  • the network device sends the DCI to the terminal device, where the DCI includes resource configuration information, where the resource configuration information carries the first indication information.
  • the first indication information may be configured in the CSI report configuration information sent by the network device to the terminal device.
  • the CSI report configuration information is used to indicate to the terminal device the specific content of the reported measurement report.
  • the measurement report may be a CSI measurement report.
  • the network device may instruct the terminal device to report one or more of the PMI, the RI, and the CQI, or, alternatively, the CSI may also include other CSI parameters, CSI types, and the like.
  • the method 300 further includes:
  • the terminal device sends the measurement report measured based on the first reference signal to the network device according to the CSI report configuration information.
  • the first indication information may be configured in CSI measurement configuration information sent by the network device to the terminal device.
  • the CSI measurement configuration information includes at least one of the following: a CSI, a resource configuration indication, a quantity of a channel to be measured, a channel with measurement interference, and a CSI report configuration indication.
  • the CSI measurement configuration information is used to indicate a correspondence between the resource configuration information and the CSI report configuration information.
  • the resource configuration information, the CSI report configuration information, and the CSI measurement configuration information may carry the same index.
  • the CSI measurement configuration information may indicate resource configuration information having the same index and a reference signal (for example, a first reference signal) for which the CSI report configuration information is targeted, the resource configuration information indicating the configured time-frequency resource, and the CSI report configuration information may be Indicates the CSI that needs to be reported. According to the CSI measurement configuration information, it can be determined which reference signal the resource configuration information and the CSI report configuration information are respectively directed to.
  • the specific method for the network device to send the first indication information to the terminal device may include any one of the following:
  • the network device sends an RRC message to the terminal device, where the RRC message includes CSI report configuration information, where the CSI report configuration information carries the first indication information;
  • the network device sends a MAC CE to the terminal device, where the MAC CE includes CSI report configuration information, where the CSI report configuration information carries the first indication information;
  • the network device sends a DCI to the terminal device, where the DCI includes CSI report configuration information, where the CSI report configuration information carries the first indication information.
  • the network device may also send the first indication information by using independent signaling. It is not particularly limited.
  • the network device sends the first indication information to the terminal device by using various manners listed above to indicate the precoding polling parameter to the network device, and the terminal device may receive the polling parameter according to the precoding and receive on each physical resource group.
  • the pre-coded first reference signal is sent to perform CSI measurement of the downlink channel.
  • the method 300 further includes:
  • the network device sends the indication information of the precoding mode to the terminal device (for convenience of distinction and description, it is recorded as the second indication information).
  • the network device may decide whether to precode the first reference signal by using a precoding polling mode. For example, when the terminal device is at a standstill or the mobility is low, the terminal device can acquire an accurate channel state. In this case, the network device can use a reference signal that is not precoded or a beamformed reference signal to perform channel. Measurement; when the terminal device is moving at a high speed, the terminal device may not be able to obtain an accurate channel state. In this case, the network device may transmit a reference signal in a precoding polling mode. Therefore, the network device may send the second indication information to the terminal device to indicate whether the first reference signal adopts a precoding polling mode.
  • a precoding polling mode For example, when the terminal device is at a standstill or the mobility is low, the terminal device can acquire an accurate channel state. In this case, the network device can use a reference signal that is not precoded or a beamformed reference signal to perform channel. Measurement; when the terminal device is moving at a high speed, the terminal device may not
  • the network device may indicate to the terminal device whether the precoding polling mode is adopted by displaying the indication. That is, the second indication information is indicated by an indication field.
  • the second indication information may be an index of a precoding mode.
  • the second indication information may be an indication field of one bit. When the bit position is “0”, it indicates that the precoding polling mode is not adopted. When the bit position is “1”, it indicates that the bit position is “1”. Precode polling mode.
  • the network device may indicate to the terminal device whether the precoding polling mode is adopted by using an implicit indication method. That is, a separate indication field is not configured for the second indication information, but is implicitly indicated by an existing indication field for indicating other information.
  • the precoding polling mode may be indicated in a manner that the indication bits of the two parameters of the precoding polling parameter set are jointly indicated. For example, suppose the two parameters in the precoding polling parameter group respectively correspond to the indication of 2 bits, and if the two 2-bit indicating bits are all “00”, it is considered to adopt the precoding polling mode, if two The precoding polling mode is considered to be adopted if at least one of the 2-bit indicator bits is not "00". In this case, the second indication information and the first indication information are the same indication information.
  • the specific method for the network device to send the second indication information to the terminal device may include any one of the following:
  • the network device sends an RRC message to the terminal device, where the RRC message carries the second indication information
  • the network device sends a MAC CE to the terminal device, where the MAC CE carries the second indication information; or
  • the network device sends a PDCCH to the terminal device, where the PDCCH carries the second indication information.
  • the second indication information is carried in a DCI in the PDCCH.
  • the specific method for the network device to send the second indication information to the terminal device may include any one of the following:
  • the network device sends an RRC message to the terminal device, where the RRC message includes resource configuration information, where the resource configuration information carries the second indication information;
  • the network device sends a MAC CE to the terminal device, where the MAC CE includes resource configuration information, where the resource configuration information carries the second indication information;
  • the network device sends a DCI to the terminal device, where the DCI includes resource configuration information, and the resource configuration information carries the second indication information.
  • the specific method for the network device to send the second indication information to the terminal device may include any one of the following:
  • the network device sends an RRC message to the terminal device, where the RRC message includes CSI report configuration information, where the CSI report configuration information carries the second indication information;
  • the network device sends a MAC CE to the terminal device, where the MAC CE includes CSI report configuration information, where the CSI report configuration information carries the second indication information;
  • the network device sends a DCI to the terminal device, where the DCI includes CSI report configuration information, where the CSI report configuration information carries the second indication information.
  • the specific signaling used to carry the second indication information may be the same as or different from the specific signaling that carries the first indication information.
  • the first indication information and the second indication information may be carried in the resource configuration information; or
  • the second indication information may be carried in the resource configuration information, where the first indication information may be carried in the CSI report configuration information; or the first indication information may include two parts of information, which are respectively carried in the RRC message and the DCI, where The second indication information may be carried in the DCI.
  • This application is not particularly limited.
  • the network device may also send the first indication information or the second indication information only to the terminal device. For example, if the network device does not adopt the precoding polling mode, the network device may send only the second indication information to the terminal device, to notify the terminal device that the precoding polling mode is not adopted. In this case, the network device does not need to The terminal device sends the first indication information; or, if the network device adopts the pre-encoding polling mode, and the pre-encoding polling parameter is configured by the network device, the network device may send the first indication information to the terminal device, to notify the terminal The precoding polling parameter used by the device. In this case, the network device may not send the second indication information to the terminal device, because the terminal device may receive the precoding polling parameter indicated by the first indication information. Make sure the network device is in precoding polling mode.
  • the first reference signal is precoded by the network device by using a method of precoding, and the precoded first reference signal is carried in multiple physical resource groups, but is not used between adjacent resource groups.
  • the encoding vector may be the same. For example, as shown in FIG. 5, PRG #1 and PRG #3 correspond to the same precoding vector, that is, precoding vector #1, PRG #2 and PRG #4 correspond to the same precoding vector, that is, precoding Vector #2. Therefore, after acquiring the precoding polling parameters configured for the first reference signal, the terminal device can bind the physical resource groups corresponding to the same precoding vector together for channel measurement.
  • step 330 specifically includes:
  • the terminal device divides the resources in the multiple physical resource groups according to the parameters in the precoding polling parameter group, to obtain at least two resource group sets, the at least two resource group sets and at least two precoding matrices.
  • the terminal device performs CSI measurement of the downlink channel on the received pre-coded first reference signal on the at least two resource group sets.
  • the terminal device may independently perform CSI measurement of the downlink channel according to each parameter in the precoding polling parameter group and the precoded first reference signal carried in each physical resource group. This application is not particularly limited.
  • the terminal device may process the measurement results of the physical resource groups corresponding to the same precoding vector, for example, equal channel averaging corresponding to the same precoding vector, or other channel parameters corresponding to the same precoding vector.
  • the method for processing the measurement result by the terminal device in the present application is not particularly limited.
  • the embodiment of the present invention performs precoding polling on the first reference signal by using at least two precoding vectors by the network device, so that the same reference signal can use at least two precoding vectors to perform CSI measurement, that is, The measurement of the equivalent channel corresponding to the coding vector to obtain more equivalent channel measurement effects, thereby facilitating the flexibility and spatial freedom of network device scheduling; on the other hand, providing a transmission scheme for precoding polling
  • the polling precoding matrix ensures reliable transmission of data and improves the robustness of the transmission system.
  • the precoding of the first reference signal is performed by means of precoding polling, compared to non-polling.
  • the channel can be measured more fairly, since different precoding vectors are used for resources that are close to each other (for example, PRG #1 and PRG #2 shown in FIG. 4) (for example, as shown in FIG. 5) Precoding vector #1 and precoding vector #2) are measured, that is, different precoding is used for the same resource (for example, resources composed of PRG #1 and PRG #2 shown in FIG. 4) The amount (for example, corresponding to the precoding vector #1 and the precoding vector #2 shown in FIG. 5) is measured while using the same every other frequency (for example, PRG #1 and PRG #3 shown in FIG. 5).
  • the precoding vector (such as the precoding vector #1 shown in FIG. 5) is measured once, that is, it is measured at a small granularity of each bandwidth, thereby making the measured measurement result more accurate and more reliable for data. Transmission is beneficial to improve the robustness of the transmission system.
  • the network device may perform precoding polling on the multiple reference signals by using at least two precoding matrices, thereby obtaining equivalents corresponding to different precoding matrices.
  • the measurement effect of the channel may be performed by using at least two precoding matrices, thereby obtaining equivalents corresponding to different precoding matrices.
  • FIG. 7 is a schematic flowchart of a method 400 for transmitting and receiving a second reference signal according to another embodiment of the present invention, which is shown from the perspective of device interaction. As shown, the method 400 illustrated in FIG. 7 can include steps 410 through 430. Method 400 is described in detail below in conjunction with FIG.
  • step 410 the terminal device performs precoding polling on the second reference signal by using at least two precoding vectors to obtain a precoded second reference signal.
  • the specific method of coding polling is the same. To avoid repetition, it will not be repeated here.
  • the second reference signal is a reference signal used for performing uplink channel measurement.
  • the second reference signal can be an SRS.
  • step 410 specifically includes:
  • the terminal device performs precoding polling on the second reference signal by using the at least two precoding vectors based on each parameter in the precoding polling parameter group.
  • the precoding polling parameter set includes at least: a number of precoding vectors and a granularity of precoding polling.
  • the terminal device may obtain the parameters in the precoding polling parameter group in any one of the following manners:
  • Manner 1 At least one parameter in the precoding polling parameter group is pre-configured in the network device and the terminal device.
  • At least one parameter in the precoding polling parameter group is pre-configured in the terminal device and the network device.
  • Manner 2 The network device sends indication information of the precoding polling parameter to the terminal device (for the purpose of distinguishing and explaining, the third indication information is recorded).
  • the terminal device receives the third indication information that is sent by the network device, where the third indication information includes: an index of the precoding polling parameter group, or at least one parameter in the precoding polling parameter group.
  • the method 400 further includes:
  • the network device sends resource configuration information to the terminal device, where the resource configuration information indicates a time-frequency resource used to carry the pre-coded second reference signal.
  • the terminal device may determine a time-frequency resource for carrying the pre-coded second reference signal, so that the pre-coded second reference signal is sent by using the time-frequency resource.
  • the resource configuration information includes any one of the following:
  • the resource configuration information of the multiple reference signals carried in the resource set, where the resource set includes the multiple physical resource groups, and the multiple reference signals carried in the resource set correspond to the same precoding polling parameters.
  • the third indication information is configured in the resource configuration information.
  • the method 400 further includes:
  • the terminal device receives the fourth indication information sent by the network device, where the fourth indication information is used to indicate whether the terminal device adopts a precoding polling mode.
  • the fourth indication information is configured in the resource configuration information.
  • step 420 the terminal device sends the precoded second reference signal to the network device.
  • the network device receives the precoded second reference signal sent by the terminal device.
  • the network device can receive the pre-coded second reference signal directly on the time-frequency resource, because the network device configures the terminal device with the time-frequency resource for sending the second reference signal.
  • the resource that is configured by the network device to be used by the terminal device to carry the pre-coded second reference signal may be multiple physical resource groups, where the multiple physical resource groups correspond to at least two precoding vectors.
  • the second reference signal corresponds to one precoding vector in the same physical resource group, and the precoding vectors corresponding to any two adjacent physical resource groups are different.
  • the plurality of physical resource groups may constitute a reference signal resource set for carrying one or more reference signals.
  • the plurality of reference signals carried in the reference signal resource set correspond to one precoding matrix in the same physical resource group, and the precoding matrices corresponding to any two adjacent physical resource groups are different.
  • each column vector of the precoding matrix corresponds to one reference signal, that is, corresponds to one antenna port.
  • step 430 the network device performs CSI measurement of the uplink channel according to the received pre-coded second reference signal.
  • step 430 specifically includes:
  • the network device performs CSI measurement of the uplink channel according to each parameter in the precoding polling parameter group and the received precoded second reference signal.
  • the network device may perform CSI measurement of the uplink channel according to each parameter in the precoding polling parameter group and the precoded second reference signal received on each physical resource group.
  • the specific method for the network device to perform the CSI measurement of the uplink channel on each physical resource group may be the same as the specific method for the CSI measurement of the uplink channel of the network device in the prior art. For the sake of brevity, a detailed description of the specific process is omitted here.
  • the method 400 further includes:
  • the network device determines channel state information of the downlink channel according to channel state information of the uplink channel.
  • the network device may determine channel state information of the downlink channel according to channel state information of the uplink channel by using channel reciprocity.
  • the channel state information of the uplink channel measured by the network device can be used to determine channel state information of the downlink channel.
  • the channel state information of the uplink channel measured by the network device may be not only limited to channel state information for performing downlink channel, but may also be used to indicate channel state information of the uplink channel to the terminal device, so that the terminal device performs uplink data transmission. .
  • the method 400 further includes:
  • the network device sends channel state information of the uplink channel to the terminal device.
  • the network device may send the channel state information of the uplink channel to the terminal device according to the measured measurement result, so that the terminal device performs data according to the channel state information of the uplink channel indicated by the network device. transmission.
  • the terminal device performs precoding polling on the second reference signal by using at least two precoding vectors, so that CSI measurement can be performed on the second reference signal by using at least two precoding vectors, that is, different from The measurement of the equivalent channel corresponding to the precoding vector, thereby obtaining the measurement effect of different equivalent channels.
  • the CSI of the uplink channel measured by the network device may be used to indicate to the terminal device, so that the terminal device performs uplink transmission, and the CSI of the downlink channel may be determined by channel reciprocity to facilitate downlink transmission.
  • the technical solution of the present application can obtain more measurement results, which is beneficial to improve flexibility and spatial freedom of network device scheduling; on the other hand, a transmission scheme for precoding polling Providing a precoding matrix for polling, ensuring reliable transmission of data, and improving robustness of the transmission system; on the other hand, precoding the second reference signal by means of precoding polling, compared to non- In the case of polling, the channel can be measured more fairly, since the two relatively close resources are measured by different precoding vectors, that is, different precoding vectors are used for the same resource to measure, and every A frequency is measured once using the same precoding vector, that is, it is measured at a small granularity of each bandwidth, so that the measured measurement result is more accurate, which is more conducive to reliable transmission of data, and is advantageous for improving the robustness of the transmission system. .
  • FIG. 8 is a schematic block diagram of a network device 10 according to an embodiment of the present invention. As shown in FIG. 8, the network device 10 includes a processing module 11 and a transmitting module 12.
  • the network device 10 may correspond to a network device in a method 300 of transmitting and receiving reference signals in accordance with an embodiment of the present invention
  • the network device 10 may include a method 300 for performing the transmitting and receiving of reference signals in FIG. A module of the method performed by the network device.
  • the modules in the network device 10 and the other operations and/or functions described above are respectively used to implement the corresponding process of the method 300 for transmitting and receiving reference signals in FIG. 3, and are not described herein again for brevity.
  • FIG. 9 is a schematic block diagram of a terminal device 20 according to an embodiment of the present invention. As shown in FIG. 9, the terminal device 20 includes a receiving module 21 and a processing module 22.
  • the terminal device 20 may correspond to a terminal device in a method 300 of transmitting and receiving a reference signal according to an embodiment of the present invention, which may include a method 300 for performing the transmission and reception of reference signals in FIG. A module of the method performed by the terminal device.
  • the modules in the terminal device 20 and the other operations and/or functions described above are respectively used to implement the corresponding process of the method 300 for transmitting and receiving reference signals in FIG. 3, and are not described herein again for brevity.
  • FIG. 10 is a schematic block diagram of a terminal device 30 according to another embodiment of the present invention. As shown in FIG. 10, the terminal device 30 includes a processing module 31 and a transmitting module 32.
  • the processing module 31 is configured to perform precoding polling on the second reference signal by using at least two precoding vectors to obtain a precoded second reference signal, where the precoded second reference signal is composed of multiple physical resources.
  • the group carries, and the precoding vectors corresponding to the signals carried by any two adjacent physical resource groups are different;
  • the sending module 32 is configured to send the precoded second reference signal to the network device, where the second reference signal is used by the network device to perform channel state information CSI measurement of an uplink channel.
  • the processing module 31 is specifically configured to perform precoding polling on the second reference signal by using the at least two precoding vectors based on each parameter in the precoding polling parameter set. ;
  • the precoding polling parameter set includes at least: a number of precoding vectors and a granularity of precoding polling.
  • At least one parameter of the precoding polling parameter set is pre-configured in the network device and the terminal device.
  • the terminal device 30 further includes a receiving module, configured to receive third indication information that is sent by the network device, where the third indication information includes: an index of a precoding polling parameter group, or a precoding polling parameter group. At least one parameter in .
  • the receiving module is further configured to receive fourth indication information that is sent by the network device, where the fourth indication information is used to indicate whether the terminal device adopts a precoding polling mode.
  • the terminal device 30 may correspond to a terminal device in the method 400 of transmitting and receiving a reference signal according to an embodiment of the present invention, which may include a method 400 for performing the transmission and reception of reference signals in FIG. A module of the method performed by the terminal device.
  • the modules in the terminal device 30 and the other operations and/or functions described above are respectively used to implement the corresponding process of the method 400 for transmitting and receiving reference signals in FIG. 7, and are not described herein again for brevity.
  • FIG. 11 is a schematic block diagram of a network device 40 according to another embodiment of the present invention. As shown in FIG. 11, the network device 40 includes a receiving module 41 and a processing module 42.
  • the receiving module 41 is configured to receive the precoded second reference signal sent by the terminal device by using multiple physical resource groups, and the precoding vectors corresponding to the signals carried by any two adjacent physical resource groups are different;
  • the processing module 42 is configured to perform CSI measurement of the uplink channel according to the precoded second reference signal.
  • the processing module 42 is specifically configured to perform CSI measurement of the uplink channel according to each parameter in the precoding polling parameter group and the precoded second reference signal.
  • the precoding polling parameter set includes at least: a number of precoding vectors and a granularity of precoding polling.
  • At least one parameter of the precoding polling parameter set is pre-configured in the network device and the terminal device.
  • the network device 40 further includes a sending module, configured to send third indication information to the terminal device, where the third indication information includes: an index of a precoding polling parameter group, or a precoding polling parameter group At least one parameter.
  • the sending module is further configured to send fourth indication information to the terminal device, where the fourth indication information is used to indicate whether the terminal device adopts a precoding polling mode.
  • the network device 40 may correspond to a network device in a method 400 of transmitting and receiving reference signals in accordance with an embodiment of the present invention, which may include a method 400 for performing the transmission and reception of reference signals in FIG. A module of the method performed by the terminal device.
  • the modules in the network device 40 and the other operations and/or functions described above are respectively used to implement the corresponding process of the method 400 for transmitting and receiving reference signals in FIG. 7, and are not described herein again for brevity.
  • FIG. 12 is a schematic block diagram of a network device 50 according to an embodiment of the present invention.
  • the network device 50 includes a transceiver 51, a processor 52, and a memory 53.
  • the transceiver 51, the processor 52 and the memory 53 communicate with each other through an internal connection path for transferring control and/or data signals.
  • the memory 53 is used for storing a computer program, and the processor 52 is configured to be called from the memory 53.
  • the computer program is run to control the transceiver 51 to send and receive signals.
  • the memory 53 may be disposed in the processor 52 or may be independent of the processor 52.
  • the network device 50 may correspond to a network device in a method 300 of transmitting and receiving reference signals in accordance with an embodiment of the present invention, which may include a method 300 for performing the transmitting and receiving of reference signals in FIG. The unit of the method performed by the network device.
  • the respective units in the network device 50 and the other operations and/or functions described above are respectively used to implement the corresponding processes of the method 300 for transmitting and receiving reference signals in FIG. 3, and are not described herein again for brevity.
  • the network device 50 may correspond to a network device in a method 400 of transmitting and receiving reference signals in accordance with an embodiment of the present invention, which may include a network device for performing the method 400 of transmitting and receiving reference signals in FIG. The unit of the method of execution.
  • the respective units in the network device 50 and the other operations and/or functions described above are respectively used to implement the corresponding process of the method 400 for transmitting and receiving reference signals in FIG. 7, and are not described herein again for brevity.
  • FIG. 13 is a schematic block diagram of a terminal device 60 according to an embodiment of the present invention.
  • the terminal device 60 includes a transceiver 61, a processor 62, and a memory 63.
  • the transceiver 61, the processor 62 and the memory 63 communicate with each other through an internal connection path for transferring control and/or data signals.
  • the memory 63 is for storing a computer program, and the processor 62 is configured to be called from the memory 63.
  • the computer program is run to control the transceiver 61 to send and receive signals.
  • the memory 63 may be disposed in the processor 62 or may be independent of the processor 62.
  • the terminal device 60 may correspond to a terminal device in the method 300 of transmitting and receiving a reference signal according to an embodiment of the present invention, which may include a method 300 for performing the transmission and reception of reference signals in FIG. A unit of the method of the terminal device.
  • the respective units in the terminal device 60 and the other operations and/or functions described above are respectively used to implement the corresponding process of the method 300 for transmitting and receiving reference signals in FIG. 3, and are not described herein again for brevity.
  • the terminal device 60 may correspond to a terminal device in the method 400 of transmitting and receiving a reference signal according to an embodiment of the present invention
  • the terminal device 60 may include a terminal for performing the method 400 of transmitting and receiving a reference signal in FIG.
  • the unit of the method that the device performs the respective units in the terminal device 60 and the other operations and/or functions described above are respectively used to implement the corresponding process of the method 400 for transmitting and receiving reference signals in FIG. 7, 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 general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • 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
  • DR RAM direct memory bus random access memory
  • 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 various media that can store program codes, such as a USB flash drive, a removable hard disk, a read only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

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Abstract

本申请提供了一种发送和接收参考信号的方法、网络设备和终端设备，能够采用更多的预编码向量(或预编码矩阵)进行 CSI 测量，以获取更多等效信道的测量效果，从而有利于提高网络设备调度的灵活性和空间自由度。该方法包括：网络设备采用至少两个预编码向量对第一参考信号进行预编码轮询，得到预编码后的第一参考信号，该预编码后的第一参考信号由多个物理资源组承载，且任意两个相邻物理资源组承载的信号对应的预编码向量不同；该网络设备通过该多个物理资源组向终端设备发送该预编码后的第一参考信号，该第一参考信号用于该终端设备进行信道的 CSI 测量。

Description

发送和接收参考信号的方法、网络设备和终端设备
本申请要求于2017年6月15日提交中国专利局、申请号为201710453767.3、发明名称为“发送和接收参考信号的方法、网络设备和终端设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及无线通信领域，并且更具体地，涉及发送和接收参考信号的方法、网络设备和终端设备。
背景技术
在多天线技术中，通常采用预编码(precoding)技术来改善信道。为了获得较好的传输可靠性，网络设备可以根据终端设备反馈的信道状态信息(channel state information，CSI)进行预编码矩阵(precoding matrix)的计算与选择。而终端设备的反馈依赖于信道状态信息参考信号(channel state information reference signal，CSI-RS)的测量，因此，当前技术中考虑使用波束赋形(beamformed)的CSI-RS进行CSI测量，来获得终端设备的反馈，从而可以达到减小导频开销和信道测量准确性的效果。
然而，经过波束赋形的CSI-RS往往是针对某一个预编码矩阵对应的等效信道的CSI测量，终端设备基于波束赋形的CSI-RS进行CSI测量，也就是针对这个预编码矩阵对应的等效信道测量而反馈的CSI，因此，这种CSI测量的方式不够灵活，大大限制了网络设备调度的灵活性和空间自由度。
发明内容
本申请提供一种发送和接收参考信号的方法、网络设备和终端设备，以采用更多的预编码向量(或预编码矩阵)进行CSI测量，以获取更多等效信道的测量效果。
第一方面，提供了一种发送参考信号的方法，包括：
网络设备采用至少两个预编码向量对第一参考信号进行预编码轮询，得到预编码后的第一参考信号，所述预编码后的第一参考信号由多个物理资源组承载，且任意两个相邻的物理资源组承载的信号对应的预编码向量不同；
所述网络设备通过所述多个物理资源组向终端设备发送所述预编码后的第一参考信号，所述第一参考信号用于所述终端设备进行下行信道的CSI测量。
因此，本发明实施例通过网络设备采用至少两个预编码向量对第一参考信号进行预编码轮询，可以实现对第一参考信号采用至少两个预编码向量进行CSI测量，也就是对与不同预编码向量对应的等效信道的测量，从而获得不同等效信道的测量效果，相比于现有技术中在一个测量带宽上对一个参考信号采用一个预编码向量进行预编码以获取某个预编码向量对应的等效信道的测量而言，本申请的技术方案能够获得更多的测量结果，有利于 提高网络设备调度的灵活性和空间自由度；另一方面，为预编码轮询的传输方案提供用于轮询的预编码矩阵，保证数据的可靠传输，提高传输系统的鲁棒性；再一方面，由于采用了预编码轮询的方式对第一参考信号进行预编码，相比于非轮询的情况，能够更加公平地测量信道，由于将两个距离比较接近的资源采用了不同的预编码向量去测量，也就是对于相同的资源采用了不同的预编码向量去测量，同时每隔一段频率使用相同的预编码向量测量一次，也就是在每个带宽小粒度上得以测量，由此测量得到的测量结果更加准确，更有利于数据的可靠传输，有利于提高传输系统的鲁棒性。
可以理解，对于该多个物理资源组中承载的多个参考信号而言，网络设备可以采用至少两个预编码矩阵对该多个参考信号进行预编码轮询，从而获得与不同预编码矩阵对应的等效信道的测量效果。
可选地，所述网络设备采用至少两个预编码向量对第一参考信号进行预编码轮询，包括：
所述网络设备基于预编码轮询参数组中的各参数，采用所述至少两个预编码向量对所述第一参考信号进行预编码轮询。
在本发明实施例中，所述预编码轮询参数组中的参数中的全部或者部分可以预先定义，也可以由网络设备确定后通知终端设备。
可选地，所述预编码轮询参数组中的至少一个参数预先配置在所述网络设备和所述终端设备中。
由于将预编码轮询参数组预先配置在网络设备和终端设备中，可以减少指示信息带来的信令开销。
可选地，所述方法还包括：
所述网络设备向所述终端设备发送第一指示信息，所述第一指示信息包括：预编码轮询参数组的索引，或者，预编码轮询参数组中的至少一个参数。
由于可以通过信令来指示预编码轮询参数组中的至少一个参数，使得预编码轮询参数中的参数可以动态调整，相比于上述预先定义预编码轮询参数的方法来说，更加灵活。
可选地，所述第一指示信息可以承载于以下至少一个消息中：
无线资源控制(radio resource control，RRC)消息、媒体接入控制(media access control，MAC)控制元素(control element，CE)以及下行控制信息(downlink control information，DCI)。
通过上述信令中的任意一种来承载第一指示信息，可以实现预编码轮询参数的动态调整。
可选地，所述方法还包括：
所述网络设备向所述终端设备发送资源配置(resource setting)信息，所述资源配置信息用于指示承载所述预编码后的第一参考信号的时频资源。
可选地，所述资源配置信息包括以下任意一种：
所述第一参考信号的资源配置信息；
所述多个物理资源组中承载的多个参考信号的资源配置信息；或者，
资源集合中承载的多个参考信号的资源配置信息，所述资源集合包括所述多个物理资源组，所述资源集合中承载的多个参考信号对应相同的预编码轮询参数。
可选地，所述方法还包括：
所述网络设备向所述终端设备发送CSI报告配置(CSI reporting setting)信息，所述CSI报告配置信息用于指示所述终端设备需要上报的CSI。
可选地，所述方法还包括：
所述网络设备向所述终端设备发送CSI测量配置(CSI measurement setting)信息，所述CSI测量配置信息用于指示所述资源配置信息与所述CSI报告配置信息间的对应关系。
可选地，所述CSI测量配置信息包括以下至少一项：CSI、资源配置指示、待测量信道的数量、待测量干扰的信道、CSI报告配置指示。可选地，所述第一指示信息配置于以下至少一个信息中：所述资源配置信息、所述CSI报告配置信息或者所述CSI测量配置信息。
例如，可以通过上述任意一个信息中的指示域来指示预编码轮询参数组中的至少一个参数，或者，预编码轮询参数组的索引。
可选地，所述方法还包括：
所述网络设备向所述终端设备发送第二指示信息，所述第二指示信息用于指示所述预编码后的第一参考信号是否采用了预编码轮询模式。
可选地，所述第二指示信息承载于以下至少一个消息中：RRC消息、MAC CE和DCI。
可选地，所述第二指示信息配置于以下至少一个信息中：所述资源配置信息、所述CSI报告配置信息或者所述CSI测量配置信息。
可选地，所述资源配置信息可以承载于以下任意一个消息中：RRC消息、MAC CE或者DCI。
可选地，所述CSI报告配置信息可以承载于以下任意一个消息中：RRC消息、MAC CE或者DCI。
可选地，所述CSI测量配置信息可以承载于以下任意一个消息中：RRC消息、MAC CE或者DCI。
第二方面，提供了一种接收参考信号的方法，包括：
终端设备通过多个物理资源组接收网络设备发送的预编码后的第一参考信号，任意两个相邻的物理资源组承载的信号对应的预编码向量不同；
所述终端设备根据所述预编码后的第一参考信号进行下行信道的信道状态信息CSI测量。
因此，本发明实施例通过网络设备采用至少两个预编码向量对第一参考信号进行预编码轮询，可以实现对第一参考信号采用至少两个预编码向量进行CSI测量，也就是对与不同预编码向量对应的等效信道的测量，从而获得不同等效信道的测量效果，相比于现有技术中在一个测量带宽上对一个参考信号采用一个预编码向量进行预编码以获取某个预编码向量对应的等效信道的测量而言，本申请的技术方案能够获得更多的测量结果，有利于提高网络设备调度的灵活性和空间自由度；另一方面，为预编码轮询的传输方案提供用于轮询的预编码矩阵，保证数据的可靠传输，提高传输系统的鲁棒性；再一方面，由于采用了预编码轮询的方式对第一参考信号进行预编码，相比于非轮询的情况，能够更加公平地测量信道，由于将两个距离比较接近的资源采用了不同的预编码向量去测量，也就是对于相同的资源采用了不同的预编码向量去测量，同时每隔一段频率使用相同的预编码向量测 量一次，也就是在每个带宽小粒度上得以测量，由此测量得到的测量结果更加准确，更有利于数据的可靠传输，有利于提高传输系统的鲁棒性。
可以理解，对于该多个物理资源组中承载的多个参考信号而言，网络设备可以采用至少两个预编码矩阵对该多个参考信号进行预编码轮询，从而获得与不同预编码矩阵对应的等效信道的测量效果。
可选地，所述终端设备根据所述预编码后的第一参考信号进行下行信道的CSI测量，包括：
所述终端设备根据预编码轮询参数组中的各参数以及所述预编码后的第一参考信号进行下行信道的CSI测量。
在本发明实施例中，所述预编码轮询参数组中的参数中的全部或者部分可以预先定义，也可以由网络设备确定后通知终端设备。
可选地，所述预编码轮询参数组中的至少一个参数预先配置在所述终端设备和所述网络设备中。
由于将预编码轮询参数组预先配置在网络设备和终端设备中，可以减少指示信息带来的信令开销。
可选地，所述方法还包括：
所述终端设备接收所述网络设备发送的第一指示信息，所述第一指示信息包括：预编码轮询参数组的索引，或者，预编码轮询参数组中的至少一个参数。
由于可以通过信令来指示预编码轮询参数组中的至少一个参数，使得预编码轮询参数中的参数可以动态调整，相比于上述预先定义预编码轮询参数的方法来说，更加灵活。
可选地，所述第一指示信息可以承载于以下至少一个消息中：
无线资源控制(radio resource control，RRC)消息、媒体接入控制(media access control，MAC)控制元素(control element，CE)以及下行控制信息(downlink control information，DCI)。
通过上述信令中的任意一种来承载第一指示信息，可以实现预编码轮询参数的动态调整。
可选地，所述方法还包括：
所述终端设备接收所述网络设备发送的资源配置信息，所述资源配置信息用于指示承载所述预编码后的第一参考信号的时频资源。
可选地，所述资源配置信息包括以下任意一种：
所述第一参考信号的资源配置信息；
所述多个物理资源组中承载的多个参考信号的资源配置信息；或者，
资源集合中承载的多个参考信号的资源配置信息，所述资源集合包括所述多个物理资源组，所述资源集合中承载的多个参考信号对应相同的预编码轮询参数。
可选地，所述方法还包括：
所述终端设备接收所述网络设备发送的CSI报告配置信息，所述CSI报告配置信息用于指示所述终端设备需要上报的CSI。
可选地，所述方法还包括：
所述终端设备接收所述网络设备发送的CSI测量配置信息，所述CSI测量配置信息用 于指示所述资源配置信息与所述CSI报告配置信息之间的对应关系。
可选地，所述CSI测量配置信息包括以下至少一项：CSI、资源配置指示、待测量信道的数量、带测量干扰的信道、CSI报告配置指示。
例如，可以通过上述任意一个信息中的指示域来指示预编码轮询参数组中的至少一个参数，或者，预编码轮询参数组的索引。
可选地，所述方法还包括：
所述终端设备接收所述网络设备发送的第二指示信息，所述第二指示信息用于指示所述预编码后的第一参考信号是否采用了预编码轮询模式。
可选地，所述第二指示信息承载于以下至少一个消息中：RRC消息、MAC CE和DCI。
可选地，所述第二指示信息配置于以下至少一个信息中：所述资源配置信息、所述CSI报告配置信息或者所述CSI测量配置信息。
可选地，所述资源配置信息可以承载于以下任意一个消息中：RRC消息、MAC CE或者DCI。
可选地，所述CSI报告配置信息可以承载于以下任意一个消息中：RRC消息、MAC CE或者DCI。
可选地，所述CSI测量配置信息可以承载于以下任意一个消息中：RRC消息、MAC CE或者DCI。
第三方面，提供了一种发送参考信号的方法，包括：
终端设备采用至少两个预编码向量对第二参考信号进行预编码轮询，得到预编码后的第二参考信号，所述预编码后的第二参考信号由多个物理资源组承载，且任意两个相邻的物理资源组承载的信号对应的预编码向量不同；
所述终端设备向所述网络设备发送所述预编码后的第二参考信号，所述第二参考信号用于所述网络设备进行上行信道的信道状态信息CSI测量。
因此，本发明实施例通过终端设备采用至少两个预编码向量对第二参考信号进行预编码轮询，可以实现对第二参考信采用至少两个预编码向量进行CSI测量，也就是对与不同预编码向量对应的等效信道的测量，从而获得不同等效信道的测量效果。网络设备测量得到的上行信道的CSI可以用于指示给终端设备，以便于终端设备进行上行传输，也可以通过信道互易性确定下行信道的CSI，以便于进行下行传输。因此，相比于现有技术而言，本申请的技术方案能够获得更多的测量结果，有利于提高网络设备调度的灵活性和空间自由度；另一方面，为预编码轮询的传输方案提供用于轮询的预编码矩阵，保证数据的可靠传输，提高传输系统的鲁棒性；再一方面，由于采用了预编码轮询的方式对第二参考信号进行预编码，相比于非轮询的情况，能够更加公平地测量信道，由于将两个距离比较接近的资源采用了不同的预编码向量去测量，也就是对于相同的资源采用了不同的预编码向量去测量，同时每隔一段频率使用相同的预编码向量测量一次，也就是在每个带宽小粒度上得以测量，由此测量得到的测量结果更加准确，更有利于数据的可靠传输，有利于提高传输系统的鲁棒性。
可以理解，对于该多个物理资源组中承载的多个参考信号而言，网络设备可以采用至少两个预编码矩阵对该多个参考信号进行预编码轮询，从而获得与不同预编码矩阵对应的等效信道的测量效果。
可选地，所述终端设备采用至少两个预编码向量对第二参考信号进行预编码轮询，包括：
所述终端设备基于预编码轮询参数组中的各参数，采用所述至少两个预编码向量对所述第二参考信号进行预编码轮询。
在本发明实施例中，所述预编码轮询参数组中的参数中的全部或者部分可以预先定义，也可以由网络设备确定后通知终端设备。
可选地，所述预编码轮询参数组中的至少一个参数预先配置在所述网络设备和所述终端设备中。
由于将预编码轮询参数组预先配置在网络设备和终端设备中，可以减少指示信息带来的信令开销。
可选地，所述方法还包括：
所述终端设备接收所述网络设备发送的第三指示信息，所述第三指示信息包括：预编码轮询参数组的索引，或者，预编码轮询参数组中的至少一个参数。
由于可以通过信令来指示预编码轮询参数组中的至少一个参数，使得预编码轮询参数中的参数可以动态调整，相比于上述预先定义预编码轮询参数的方法来说，更加灵活。
可选地，所述第三指示信息可以承载于以下至少一个消息中：RRC消息、MAC CE或者DCI。
通过上述信令中的任意一种来承载第一指示信息，可以实现预编码轮询参数的动态调整。
可选地，所述方法还包括：
所述终端设备接收所述网络设备发送的资源配置信息，所述资源配置信息用于指示承载所述预编码后的第二参考信号的时频资源。
可选地，所述资源配置信息包括以下任意一种：
所述第二参考信号的资源配置信息；
所述多个物理资源组中承载的多个参考信号的资源配置信息；或者，
资源集合中承载的多个参考信号的资源配置信息，所述资源集合包括所述多个物理资源组，所述资源集合中承载的多个参考信号对应相同的预编码轮询参数。
可选地，所述第三指示信息配置于所述资源配置信息中。
例如，通过资源配置信息中的指示域来指示预编码轮询参数组中的至少一个参数，或者，预编码轮询参数组的索引。
可选地，所述方法还包括：
所述终端设备接收所述网络设备发送的第四指示信息，所述第四指示信息用于指示所述终端设备是否采用预编码轮询模式。
可选地，所述第四指示信息承载于以下至少一个消息中：RRC消息、MAC CE和DCI。
可选地，所述第四指示信息配置于所述资源配置信息中。
可选地，所述资源配置信息可以承载于以下任意一个消息中：RRC消息、MAC CE或者DCI。
在本发明实施例中，第二参考信号可以用于网络设备进行上行信道的CSI测量，也可以利用信道互易性，用于时分双工(time division depluxing，TDD)模式下下行信道的CSI 确定。
若所述第二参考信号用于上行信道的CSI测量，则可选地，所述方法还包括：
所述终端设备接收所述网络设备发送的上行信道的CSI，所述上行信道的CSI由所述网络设备基于所述预编码后的第二参考信号进行CSI测量得到。
第四方面，提供了一种接收参考信号的方法，包括：
网络设备通过多个物理资源组接收终端设备发送的预编码后的第二参考信号，任意两个相邻的物理资源组承载的信号对应的预编码向量不同；
所述网络设备根据所述预编码后的第二参考信号进行上行信道的CSI测量。
因此，本发明实施例通过终端设备采用至少两个预编码向量对第二参考信号进行预编码轮询，可以实现对第二参考信采用至少两个预编码向量进行CSI测量，也就是对与不同预编码向量对应的等效信道的测量，从而获得不同等效信道的测量效果。网络设备测量得到的上行信道的CSI可以用于指示给终端设备，以便于终端设备进行上行传输，也可以通过信道互易性确定下行信道的CSI，以便于进行下行传输。因此，相比于现有技术而言，本申请的技术方案能够获得更多的测量结果，有利于提高网络设备调度的灵活性和空间自由度；另一方面，为预编码轮询的传输方案提供用于轮询的预编码矩阵，保证数据的可靠传输，提高传输系统的鲁棒性；再一方面，由于采用了预编码轮询的方式对第二参考信号进行预编码，相比于非轮询的情况，能够更加公平地测量信道，由于将两个距离比较接近的资源采用了不同的预编码向量去测量，也就是对于相同的资源采用了不同的预编码向量去测量，同时每隔一段频率使用相同的预编码向量测量一次，也就是在每个带宽小粒度上得以测量，由此测量得到的测量结果更加准确，更有利于数据的可靠传输，有利于提高传输系统的鲁棒性。
可以理解，对于该多个物理资源组中承载的多个参考信号而言，网络设备可以采用至少两个预编码矩阵对该多个参考信号进行预编码轮询，从而获得与不同预编码矩阵对应的等效信道的测量效果。
可选地，所述网络设备根据所述预编码后的第二参考信号进行上行信道的CSI测量，包括：
所述网络设备根据预编码轮询参数组中的各参数以及所述预编码后的第二参考信号进行上行信道的CSI测量。
在本发明实施例中，所述预编码轮询参数组中的参数中的全部或者部分可以预先定义，也可以由网络设备确定后通知终端设备。
可选地，所述预编码轮询参数组至少包括：预编码向量的数目和预编码轮询的粒度。
由于将预编码轮询参数组预先配置在网络设备和终端设备中，可以减少指示信息带来的信令开销。
可选地，所述方法还包括：
所述网络设备向所述终端设备发送第三指示信息，所述第三指示信息包括：预编码轮询参数组的索引，或者，预编码轮询参数组中的至少一个参数。
由于可以通过信令来指示预编码轮询参数组中的至少一个参数，使得预编码轮询参数中的参数可以动态调整，相比于上述预先定义预编码轮询参数的方法来说，更加灵活。
可选地，所述第三指示信息可以承载于以下至少一个消息中：RRC消息、MAC CE 或者DCI。
通过上述信令中的任意一种来承载第一指示信息，可以实现预编码轮询参数的动态调整。
可选地，所述方法还包括：
所述网络设备向所述终端设备发送资源配置信息，所述资源配置信息用于指示承载所述预编码后的第二参考信号的时频资源。
可选地，所述资源配置信息包括以下任意一种：
所述第二参考信号的资源配置信息；
所述多个物理资源组中承载的多个参考信号的资源配置信息；或者，
资源集合中承载的多个参考信号的资源配置信息，所述资源集合包括所述多个物理资源组，所述资源集合中承载的多个参考信号对应相同的预编码轮询参数。
可选地，所述第三指示信息配置于所述资源配置信息中。
例如，通过资源配置信息中的指示域来指示预编码轮询参数组中的至少一个参数，或者，预编码轮询参数组的索引。
可选地，所述方法还包括：
所述网络设备向所述终端设备发送第四指示信息，所述第四指示信息用于指示所述终端设备是否采用预编码轮询模式。
可选地，所述第四指示信息承载于以下至少一个消息中：RRC消息、MAC CE和DCI。
可选地，所述第四指示信息配置于所述资源配置信息中。
可选地，所述资源配置信息可以承载于以下任意一个消息中：RRC消息、MAC CE或者DCI。
在本发明实施例中，第二参考信号可以用于网络设备进行上行信道的CSI测量，也可以利用信道互易性，用于时分双工(time division depluxing，TDD)模式下下行信道的CSI确定。
若所述第二参考信号用于上行信道的CSI测量，则可选地，所述方法还包括：
所述网络设备向所述终端设备发送上行信道的CSI，所述上行信道的CSI由所述网络设备基于所述预编码后的第二参考信号进行CSI测量得到。
若所述第二参考信号用于确定下行信道的CSI，则可选地，所述方法还包括：
所述网络设备根据上行信道的CSI，确定下行信道的CSI，其中，所述上行信道的CSI由所述网络设备基于所述预编码后的第二参考信号进行CSI测量得到。
第五方面，提供了一种网络设备，所述网络设备包括用于执行第一方面或第一方面任一种可能实现方式中的发送参考信号的方法的各个模块。
第六方面，提供了一种终端设备，所述终端设备包括用于执行第二方面或第二方面任一种可能实现方式中的接收参考信号的方法的各个模块。
第七方面，提供了一种终端设备，所述终端设备包括用于执行第三方面或第三方面任一种可能实现方式中的发送参考信号的方法的各个模块。
第八方面，提供了一种网络设备，所述网络设备包括用于执行第四方面或第四方面任一种可能实现方式中的接收参考信号的方法的各个模块。
第九方面，提供了一种网络设备，包括收发器、处理器和存储器。该处理器用于控制 收发器收发信号，该存储器用于存储计算机程序，该处理器用于从存储器中调用并运行该计算机程序，使得该网络设备执行第一方面及第一方面任一种可能实现方式中的方法，或者第四方面及第四方面任一种可能实现方式中的方法。
第十方面，提供了一种终端设备，包括收发器、处理器和存储器。该处理器用于控制收发器收发信号，该存储器用于存储计算机程序，该处理器用于从存储器中调用并运行该计算机程序，使得该终端设备执行第二方面及第二方面任一种可能实现方式中的方法，或者第三方面及第三方面任一种可能实现方式中的方法。
第十一方面，提供了一种通信装置，该通信装置可以为上述方法设计中的网络设备，或者为设置在网络设备中的芯片。该通信装置包括：处理器，与存储器耦合，可用于执行存储器中的指令，以实现上述第一方面或第一方面任意一种可能的实现方式中网络设备所执行的方法，或者第四方面及第四方面任一种可能实现方式中的方法。可选地，该通信装置还包括存储器。可选地，该通信装置还包括通信接口，处理器与通信接口耦合。
当所述通信装置为网络设备时，所述通信接口可以是收发器，或，输入/输出接口。
当所述通信装置为配置于网络设备中的芯片时，所述通信接口可以是输入/输出接口。
可选地，所述收发器可以为收发电路。
可选地，所述输入/输出接口可以为输入/输出电路。
第十二方面，提供了一种通信装置，该通信装置可以为上述方法设计中的终端设备，或者为设置在终端设备中的芯片。该通信装置包括：处理器，与存储器耦合，可用于执行存储器中的指令，以实现上述第二方面或第二方面任意一种可能的实现方式中终端设备所执行的方法，或者第三方面及第三方面任一种可能实现方式中的方法。可选地，该通信装置还包括存储器。可选地，该通信装置还包括通信接口，处理器与通信接口耦合。
当所述通信装置为终端设备时，所述通信接口可以是收发器，或，输入/输出接口。
当所述通信装置为配置于终端设备中的芯片时，所述通信接口可以是输入/输出接口。
可选地，所述收发器可以为收发电路。
可选地，所述输入/输出接口可以为输入/输出电路。
应理解，上述处理器的功能可以通过硬件来实现也可以通过软件来实现，当通过硬件实现时，该处理器可以是逻辑电路、集成电路等；当通过软件来实现时，该处理器可以是一个通用处理器，通过读取存储器中存储的软件代码来实现，该存储器可以集成在处理器中，可以位于该处理器之外，独立存在。
第十三方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码被网络设备运行时，使得所述网络设备执行上述第一方面及第一方面任一种可能实现方式中的方法，或者第四方面及第四方面任一种可能实现方式中的方法。
第十四方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码被终端设备运行时，使得所述终端设备执行上述第二方面及第二方面任一种可能实现方式中的方法，或者第三方面及第三方面任一种可能实现方式中的方法。
第十五方面，提供了一种计算机可读介质，所述计算机可读介质存储有程序代码，所述程序代码包括用于执行第一方面至第四方面或第一方面至第四方面中任一种可能实现 方式中的方法的指令。
可选地，若所述多个物理资源组仅用于承载一个参考信号(例如，第一参考信号或第二参考信号)，所述预编码轮询参数组至少包括：预编码向量的数目和预编码轮询的粒度。
其中，该预编码向量的数目表示该多个物理资源组中承载的预编码后的第一参考信号是基于几种不同的预编码向量进行预编码得到。
若所述多个物理资源组用于承载多个参考信号，所述预编码轮询参数组至少包括：预编码矩阵的数目和预编码轮询的粒度。
其中，该预编码矩阵的数目表示该多个物理资源组中承载的预编码后的多个参考信号是基于几种不同的预编码矩阵进行预编码得到。
可选地，预编码轮询的粒度(precoder cycling granularity)，也称为预编码轮询的大小(precoder cycling size)，表示每个物理资源组中包含的资源单元的数目。
作为示例而非限定，资源单元可以为现有协议(例如，长期演进(Long Time Evolution，LTE)协议)中定义的资源块(resource block，RB)或者资源块组(RB group，RBG)。
可选地，所述多个物理资源组在系统带宽内连续分布或离散分布。
本申请通过采用至少两个预编码向量对同一参考信号进行预编码轮询，可以采用更多的预编码向量(或预编码矩阵)进行CSI测量，以获取更多等效信道的测量效果，有利于提高网络调度的灵活性和空间自由度。
附图说明
图1是适用于本发明实施例的发送和接收参考信号的方法的通信系统的示意图；
图2是现有LTE系统中所采用的下行物理信道处理过程的示意图；
图3是本发明实施例提供的发送和接收参考信号的方法的示意性流程图；
图4是多个物理资源组与至少两个预编码矩阵的对应关系的示意图；
图5是多个物理资源组在系统带宽内分布的示意图；
图6是多个物理资源组在系统带宽内分布的另一示意图；
图7是本发明另一实施例提供的发送和接收参考信号的方法的示意性流程图；
图8是本发明实施例提供的网络设备的示意性框图；
图9是本发明实施例提供的终端设备的示意性框图；
图10是本发明另一实施例提供的终端设备的示意性框图；
图11是本发明另一实施例提供的网络设备的示意性框图；
图12是本发明实施例提供的网络设备的另一示意性框图；
图13是本发明实施例提供的终端设备的另一示意性框图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
应理解，本申请的技术方案可以应用于各种通信系统，例如：全球移动通信(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Time Evolution， LTE)系统、先进的长期演进(LTE-Advanced，LTE-A)系统、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)或下一代通信系统(例如，第五代通信(fifth-generation，5G)系统)等。其中，5G系统也可以称为新一代无线接入技术(new radio access technology，NR)系统。
为便于理解本发明实施例，首先结合图1详细说明适用于本发明实施例的通信系统。图1示出了适用于本发明实施例的用于数据传输的方法和装置的通信系统的示意图。如图1所示，该通信系统100包括网络设备102，网络设备102可包括多个天线例如，天线104、106、108、110、112和114。另外，网络设备102可附加地包括发射机链和接收机链，本领域普通技术人员可以理解，它们均可包括与信号发送和接收相关的多个部件(例如处理器、调制器、复用器、解调器、解复用器或天线等)。
应理解，网络设备可以是全球移动通信(GSM)或码分多址(CDMA)中的基站(Base Transceiver Station，BTS)，也可以是宽带码分多址(WCDMA)中的基站(NodeB，NB)，还可以是长期演进(LTE)中的演进型基站(evolutional node B，eNB或eNodeB)，或者中继站、接入点或射频拉远单元(Remote Radio Unit，RRU)，或者车载设备、可穿戴设备以及未来5G系统中的网络侧设备，如传输点(transmission point，TP)、发送接收点(transmission reception point，TRP)、基站、小基站设备等，本发明实施例对此并未特别限定。
网络设备102可以与多个终端设备(例如终端设备116和终端设备122)通信。网络设备102可以与类似于终端设备116或122的任意数目的终端设备通信。
应理解，终端设备也可以称为用户设备(user equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。终端设备可以是无线局域网(wireless local area networks，WLAN)中的站点(station，ST)，可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)设备、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备以及下一代通信系统，例如，5G网络中的终端设备或者未来演进的公共陆地移动网络(public land mobile network，PLMN)网络中的终端设备等，本发明实施例对此并未特别限定。
如图1所示，终端设备116与天线112和114通信，其中天线112和114通过前向链路118向终端设备116发送信息，并通过反向链路120从终端设备116接收信息。此外，终端设备122与天线104和106通信，其中天线104和106通过前向链路124向终端设备122发送信息，并通过反向链路126从终端设备122接收信息。
例如，在频分双工(frequency division duplex，FDD)系统中，例如，前向链路118可利用与反向链路120所使用的不同频带，前向链路124可利用与反向链路126所使用的不同频带。
再例如，在时分双工(time division duplex，TDD)系统和全双工(full duplex)系统中，前向链路118和反向链路120可使用共同频带，前向链路124和反向链路126可使用共同频带。
被设计用于通信的每个天线(或者由多个天线组成的天线组)和/或区域称为网络设 备102的扇区。例如，可将天线组设计为与网络设备102覆盖区域的扇区中的终端设备通信。在网络设备102通过前向链路118和124分别与终端设备116和122进行通信的过程中，网络设备102的发射天线可利用波束成形来改善前向链路118和124的信噪比。此外，与网络设备通过单个天线向它所有的终端设备发送信号的方式相比，在网络设备102利用波束成形向相关覆盖区域中随机分散的终端设备116和122发送信号时，相邻小区中的移动设备会受到较少的干扰。
网络设备102、终端设备116或终端设备122可以是无线通信发送装置和/或无线通信接收装置。当发送数据时，无线通信发送装置可对数据进行编码以用于传输。具体地，无线通信发送装置可获取(例如生成、从其它通信装置接收、或在存储器中保存等)要通过信道发送至无线通信接收装置的一定数目的数据比特。这种数据比特可包含在数据的传输块(或多个传输块)中，传输块可被分段以产生多个码块。
此外，该通信系统100可以是公共陆地移动网络(PLMN)网络或者设备对设备(device to device，D2D)网络或者机器对机器(machine to machine，M2M)网络或者其他网络，图1仅为便于理解而示例的简化示意图，网络中还可以包括其他网络设备，图1中未予以画出。
为便于理解本发明实施例，以下结合图2简单说明LTE系统中下行物理信道的处理过程。图2是现有LTE系统中所采用的下行物理信道处理过程的示意图。下行物理信道处理过程的处理对象为码字，码字通常为经过编码(至少包括信道编码)的比特流。码字(code word)经过加扰(scrambling)，生成加扰比特流。加扰比特流经过调制映射(modulation mapping)，得到调制符号流。调制符号流经过层映射(layer mapping)，被映射到多个层(layer)，为便于区分和说明，在本发明实施例以中，可以将经层映射之后的符号流称为层映射空间层(或者称，层映射空间流、层映射符号流)。层映射空间层经过预编码(precoding)，得到多个预编码数据流(或者称，预编码符号流)。预编码符号流经过资源粒子(RE)映射，被映射到多个RE上。这些RE随后经过正交频分复用(orthogonal frequency division multiplexing，OFDM)调制，生成OFDM符号流。OFDM符号流随后通过天线端口(antenna port)发射出去。
其中，预编码技术可以是在已知信道状态的情况下，通过在发送端对待发射信号做预先的处理，即，借助与信道资源相匹配的预编码矩阵来对待发射信号进行处理，使得经过预编码的待发射信号与信道相适配，使得接收端消除信道间影响的复杂度降低。因此，通过对发射信号的预编码处理，接收信号质量(例如信干噪比(signal to interference plus noise ratio，SINR))得以提升。因此，采用预编码技术，可以实现发送端设备与多个接收端设备在相同的时频资源上传输，也就是实现了多用户多输入多输出(multiple user multiple input multiple output，MU-MIMO)。应注意，有关预编码技术的相关描述仅用于举例，并非用于限制本发明实施例的保护范围，在具体实现过程中，还可以通过其他方式进行预编码(例如在无法获知信道状态的情况下采用预先设置的预编码矩阵或者加权处理方式进行预编码)，具体内容本文不再赘述。
发送端为了获取能够与信道相适配的预编码矩阵，通常通过发送参考信号的方式来预先进行信道状态信息(CSI)的测量，获取接收端的测量反馈，从而确定出较为准确的预编码矩阵来对待发送数据进行预编码处理。具体地，该发送端可以为网络设备，接收端可 以为终端设备，该参考信号可以为用于下行信道测量的参考信号，例如，信道状态信息参考信号(channel state information reference signal，CSI-RS)，终端设备可以根据接收到的CSI-RS，进行CSI测量，并向网络设备反馈下行信道的CSI；该发送端也可以为终端设备，接收端可以为网络设备，该参考信号可以为用于上行信道测量的参考信号，例如，探测参考信号(sounding reference signal，SRS)。网络设备可以根据接收到的RSR，进行CSI测量，向终端设备指示上行信道的CSI。其中，该CSI可以包括例如预编码矩阵指示(precoding matrix indicator，PMI)、秩指示(rank indication，RI)和信道质量指示(channel quality indicator，CQI)等。
在当前技术中，网络设备发送的CSI-RS可以为未经过预编码(non-precoded)的CSI-RS，也可以为经过波束赋形(beamformed)的CSI-RS。其中，未经过预编码的CSI-RS可以用于测量信道矩阵，终端设备测量得到的发送天线与接收天线之间的完整信道。随着多天线技术的发展，由于端口数较多，采用未经过预编码的CSI-RS进行信道测量(具体地说，为CSI测量)带来的导频开销较大，每个CSI-RS端口的功率较低，信道测量的准确性较低；而经过波束赋形的CSI-RS可以用于测量等效信道矩阵，终端设备测量得到的是经过波束赋形的等效信道，因此端口数得以减小，导频开销较小，并且信道测量的准确性较高。然而，即便采用了波束赋形的CSI-RS，终端设备也只能在与预编码向量(或预编码矩阵)对应的等效信道上进行CSI测量，这大大限制了网络设备调度的灵活性和空间自由度。
另一方面，在信道状态高速变化、终端设备高速移动或者无法获取准确CSI的情况下，无法获得比较准确的预编码矩阵。即便采用了波束赋形的CSI-RS，终端设备也只能获得一个PMI，由该PMI确定的预编码矩阵可能并不能与信道相适配，故经预编码处理得到的待发射信号也就不能准确地与当前的信道适配，从而导致接收到的信号质量下降，因此，不能保证数据传输的可靠性。
为了提高传输可靠性，一些新的传输方案被提出，例如可以包括：预编码轮询、基于预编码轮询的发射分集(precoder cycling based transmit diversity)等。采用了该传输方案的网络设备可以通过轮询的方式对数据进行预编码处理，以从多个维度上获得分集增益，来提高信号的接收质量和传输可靠性。若仍采用上述列举的未经过预编码的CSI-RS或者经过波束赋形的CSI-RS来进行信道测量，终端设备仅能够在测量带宽上反馈一个PMI，也就无法为网络设备提供用于轮询的预编码矩阵的确定依据，使得网络设备无法进行预编码轮询，也就无法保证数据的可靠传输。
有鉴于此，本申请提出了一种发送和接收参考信号的方法，一方面，能够采用更多的预编码向量进行CSI测量，以获取更多等效信道的测量效果，从而提高网络设备调度的灵活性和空间自由度，另一方面，能够为预编码轮询的传输方案提供用于轮询的预编码矩阵，从而保证数据的可靠传输，提高传输系统的鲁棒性。
下面将结合图3至图7详细说明本申请中的技术方案。应理解，这些例子只是为了帮助本领域技术人员更好地理解本发明实施例，而非限制本发明实施例的范围。
应理解，本申请的技术方案可以应用于所有采用了多天线技术的无线通信系统，例如，该无线通信系统可以为图1中所示的通信系统100。该通信系统可以包括至少一个网络设备和至少一个终端设备，网络设备和终端设备可以通过无线空口通信。例如，该通信系统 中的网络设备可以对应于图1中所示的网络设备102，终端设备可以对应于图1中所示的终端设备116或122。
还应理解，在LTE-A系统中，为了支持多天线技术，在传输模式(transmission mode，TM)9之前的传输模式中，终端设备使用小区参考信号(cell-specific reference signal，CRS)做信道测量，从版本(Release)10引入了低密度资源分布CSI-RS来代替原有的CRS，从而保证网络设备能够根据终端设备上报的CSI进行多用户调度。然而，应理解，本申请对参考信号并未特别限定，不论是CSI-RS还是CRS，甚至是未来协议中定义的其他用作信道测量的参考信号，例如，用作信道测量的解调参考信号(demodulation reference signal，DMRS)等。
在本发明实施例中，参考信号可以是由网络设备发送给终端设备的、用于测量下行信道的参考信号(为便于区分和说明，记作第一参考信号)，也可以是由终端设备发送给网络设备的、用于测量上行信道的参考信号(为便于区分和说明，记作第二参考信号)。作为示例而非限定，该第一参考信号可以为CSI-RS，第二参考信号可以为探测参考信号(sounding reference signal，SRS)。
应理解，“第一参考信号”和“第二参考信号”仅为用于区分上行和下行而命名的参考信号，而不应对本申请构成任何限定，与之对应地，在后文中出现的“第一时频资源集合”和“第二时频资源集合”是为用于区分上行资源和下行资源而命名的用于承载参考信号的资源，而不应对本申请构成任何限定。
还应理解，以上列举的参考信号的具体内容仅为示例性说明，而不应对本申请构成任何限定，本申请并不排除采用其他的参考信号用于进行信道测量的可能。
下面将结合附图，分别以网络设备向终端设备发送第一参考信号和终端设备向网络设备发送第二参考信号为例，详细说明本发明实施例提供的发送和接收参考信号的方法。
图3是从设备交互的角度示出的本发明实施例提供的发送和接收第一参考信号的方法300的示意性流程图。如图所示，图3中示出的方法300可以包括步骤310至步骤330。下面结合图3对方法300进行详细描述。
在步骤310中，网络设备采用至少两个预编码向量对第一参考信号进行预编码轮询，得到预编码后的第一参考信号。
具体地，该预编码后的第一参考信号可以承载于多个物理资源组中(或者简称，资源组)中，每个物理资源组可以包括至少一个资源单元。其中，资源单元可以理解为物理层传输的最小调度单位。每个资源单元可以为例如LTE协议中定义的RB，也可以为多个RB块构成的RBG，本申请对此并未特别限定。
换句话说，该预编码后的第一参考信号可以承载于多个资源单元中。但应注意，这并不代表该多个资源单元中的每个资源粒(resource element，RE)中都承载了该预编码后的第一参考信号，该多个资源单元中的资源(更具体地说，RE)还可以用于承载数据、其他参考信号或者其他物理信道，本申请对此并未特别限定。
可选地，用于承载该预编码后的第一参考信号的RE(为方便说明，以下简称参考信号RE)可以由网络设备配置，并通过资源配置信息将参考信号RE的位置通知给终端设备；或者，可选地，参考信号RE也可以由网络设备根据协议定义的导频图样以及该第一参考信号的端口号确定，并将该第一参考信号的端口号通过资源配置信息通知给终端设 备，以便于该终端设备确定该参考信号RE。
在本发明实施例中，为便于说明，可以将该多个物理资源组称为第一时频资源集合。该第一时频资源集合所占用的带宽可以称为该第一参考信号的测量带宽。具体地，该第一时频资源集合可以为网络设备预先配置的用于发送第一参考信号的时频资源的集合。然而，需要注意的是，该第一时频资源集合中的资源并不仅限于承载一个参考信号，也可以用于承载多个参考信号。该第一时频资源集合中承载的至少一个参考信号(可以理解，包括上述第一参考信号)可以称为一个参考信号组，该第一时频资源集合可以称为参考信号资源。例如，可以将网络设备配置的用于发送一个CSI-RS组的资源称为一个CSI-RS资源(CSI-RS resource)。
需要说明的是，参考信号与天线端口(antenna port)可以具有一一对应关系，以CSI-RS为例，天线端口也可以称为CSI-RS端口，一个CSI-RS是由一个CSI-RS端口定义的，每个CSI-RS对应一个天线端口。
在该第一时频资源集合中的资源承载多个参考信号的情况下，为该多个参考信号配置的资源可以是时分复用(time division multiplexing，TDM)的，也可以是频分复用(frequency division multiplexing，FDM)的，还可以是码分复用(code division multip，CDM)的。换句话说，网络设备可以通过TDM、FDM、CDM等方式来区分不同的天线端口。若采用FDM或者TDM，则不同天线端口的参考信号所占用的频域资源或者时域资源可以是不同的。若采用CDM，则不同天线端口的参考信号所占用的时频资源可以是相同的，而通过复用码来区分不同的天线端口。本申请对于第一时频资源集合中承载的至少一个第一参考信号的资源配置方式并未特别限定。
需要说明的是，当第一时频资源集合中的资源承载多个参考信号的情况下，网络设备对多个参考信号进行预编码处理的过程可以是相同的，终端设备对接收到的预编码后的多个参考信号的测量过程也可以是相同的，并且，网络设备对多个参考信号进行预编码处理的过程可以是同时进行的，终端设备对接收到的预编码后的多个参考信号的测量也可以是同时进行的。其中，与该第一时频资源集合中承载的多个参考信号对应的预编码矩阵则包括与多个参考信号一一对应的预编码向量。换句话说，当第一时频资源集合中仅承载一个参考信号(例如，第一参考信号)时，网络设备采用预编码向量对该第一参考信号进行预编码；当该第一时频资源集合中承载多个参考信号(例如，包括该第一参考信号的多个参考信号)时，网络设备采用预编码矩阵对该多个参考信号进行预编码，该预编码矩阵由与各参考信号一一对应的预编码向量组合而成。后文中为了简洁，省略对相同或相似情况的说明。在本发明实施例中，仅为便于说明，以对第一参考信号的处理过程为例来说明发送和接收第一参考信号的具体过程，而不应对本申请构成任何限定。
还需要说明的是，在本发明实施例中，天线端口可以理解为经过波束赋形的CSI-RS端口，相比于未经过预编码的CSI-RS端口，经波束赋形的CSI-RS的端口数量得以降低，从而可以减小导频开销。提高每个端口的发射功率。
然而，与现有技术中的经波束赋形的CSI-RS不同的是，网络设备在对该CSI-RS进行预编码处理时，采用了至少两个预编码向量来对CSI-RS进行预编码，从而可以测量与更多的预编码向量对应的等效信道，以获取更多等效信道的测量效果，从而有利于提高网络设备调度的灵活性和空间自由度。
并且，网络设备可以采用至少两个预编码向量对该第一参考信号进行预编码。该第一参考信号在同一个物理资源组中对应相同的预编码向量，并且用于承载该第一参考信号的多个物理资源组可以对应该至少两个预编码向量。
作为一个可选的实施例，网络设备可以通过轮询的方式，采用至少两个预编码向量对该第一参考信号进行预编码。其中，在任意一个物理资源组中，该第一参考信号对应了一个相同的预编码向量，且任意两个相邻的物理资源组(后文中会结合附图详细说明相邻的物理资源组)承载的信号对应的预编码向量不同。换句话说，用于承载该第一参考信号的多个物理资源组的数目可以大于或等于预编码向量的数目。
作为一个可选的实施例，网络设备可以通过轮询的方式，采用至少两个预编码矩阵对第一时频资源集合中承载的参考信号组(可以理解，该参考信号组包括上述第一参考信号)进行预编码。其中，在任意一个物理资源中，该参考信号组对应了一个相同的预编码矩阵，每个预编码列向量对应了一个参考信号，且任意两个相邻的物理资源中承载的信号对应的预编码矩阵不同。
但应理解，网络设备采用至少两个预编码向量对该第一参考信号进行预编码轮询以及采用至少两个预编码矩阵对参考信号组进行预编码轮询的方法仅为一种可能的实现方式，不应对本申请构成任何限定。
通过上文列举的网络设备对第一参考信号的预编码处理，可以实现对第一参考信号采用至少两个预编码向量(或预编码矩阵)进行CSI测量，以获取更多等效信道的测量效果，相比于现有技术中在一个测量带宽上对一个参考信号采用一个预编码向量进行预编码以获取与之对应的等效信道的CSI而言，本申请的技术方案有利于提高网络设备调度的灵活性和空间自由度。
可选地，在步骤310中，网络设备基于预编码轮询参数组中的各参数，采用至少两个预编码向量对该第一参考信号进行预编码轮询。
具体地，预编码轮询参数组可以至少包括：预编码向量(或者，预编码矩阵)的数目和预编码轮询的粒度。
其中，预编码向量的数目可以是对该第一参考信号进行预编码使用的预编码向量的数目。预编码轮询的粒度，也可以称为预编码轮询的大小，可以指示在一个物理资源组所包含的资源单元的数目，也就是使用相同的预编码向量(或者，预编码矩阵)的连续的资源单元的数目。若资源单元为RB，预编码轮询的粒度也可以称为预编码资源块组大小(precoding resource block group size，PRG size)，或者，轮询的PRG大小(cycling PRG size)。
应理解，以上列举的对参数的命名仅为示例，不应对本申请构成任何限定，本申请并不排除在未来的协议中对预编码向量(或者预编码矩阵)的数目以及预编码轮询的粒度定义其他名称并实现相同或相似功能的可能。
需要说明的是，本实施例中以一个参考信号(即，第一参考信号)为例说明了至少两个预编码向量与多个物理资源组的对应关系，但这不应对本申请构成任何限定。上文中已经说明，该多个物理资源组可以用于承载多个参考信号，若该多个物理资源组用于承载多个参考信号，则在步骤210中，该网络设备可以采用至少两个预编码矩阵对该多个参考信号进行预编码轮询。在一个物理资源组中，每个参考信号对应了一个预编码向量，多个参 考信号对应了一个预编码矩阵，则该预编码矩阵是由该多个参考信号对应的预编码向量组合而成。换句话说，该多个物理资源组中承载了多少个参考信号，该预编码矩阵就包括了多少个预编码列向量。在这种情况下，上述预编码轮询参数组可以至少包括：预编码矩阵的数目和预编码轮询的粒度。
在本发明实施例中，为便于说明，假设该第一时频资源集合中的资源承载有n(n≥1，n为自然数)个第一参考信号，对该n个第一参考信号进行预编码轮询所使用的预编码矩阵的数目为y(y≥2，y为自然数)，预编码轮询的粒度为x(x≥1，x为自然数)。
下面结合附图说明多个物理资源组与预编码矩阵(或者预编码向量)的对应关系以及多个物理资源组在系统带宽中的分布。在以下示出的多个附图中，假设RB为一个资源单元，则一个物理资源组为一个PRG。
图4是多个物理资源组与至少两个预编码矩阵的对应关系的示意图。如图所示，假设n＝2，y＝2，x＝2。则该第一时频资源集合中的资源承载了2个参考信号(例如图4中所示，该2参考信号分别对应了端口#0和端口#1)，网络设备采用了2个预编码矩阵对该2个第一参考信号进行预编码轮询。如图4中所示，PRG#1对应了预编码矩阵#1；PRG#2对应了预编码矩阵#2；PRG#3对应了预编码矩阵#1；PRG#4对应了预编码矩阵#2。由于预编码轮询的粒度x＝2，故每个物理资源组中可以包括2个资源单元(例如，RB)。又由于该第一时频资源集合中的资源承载了2个参考信号，故每个预编码矩阵可以为由2个预编码列向量组合而成的预编码矩阵。也就是说，在同一个物理资源组中，2个预编码列向量与2个第一参考信号一一对应，网络设备对每个第一参考信号分别采用所对应的预编码向量进行预编码处理。需要说明的是，在同一个物理资源组中，不同的参考信号所对应的预编码向量可以相同，也可以不同，本申请对此并未特别限定。
应理解，图4中仅为便于理解和说明，对预编码轮询参数组中的各参数赋予了具体的数值，但这不应对本申请构成任何限定。以下，为便于说明，仍以该第一时频资源集合中承载一个参考信号(即，第一参考信号)为例来说明本发明实施例，因此，该第一参考信号的预编码轮询参数可以至少包括：预编码向量的数目和预编码轮询的粒度。
需要说明的是，该多个物理资源组可以在系统带宽内连续分布或离散分布。
若该多个物理资源组在系统带宽内连续分布，则该多个物理资源组可以分布于宽带(wideband)内的部分连续的资源中或全部资源中，也可以分布于一个或多个连续或不连续的子带(subband)，或者，也可以分布于一个或多个连续或不连续的部分带宽(partial band)。在5G中，有可能会将一个带宽中的资源定义不同的资源配置参数(numerology)，例如，不同的子载波(sub carrier)间隔，部分带宽则可以为具有相同的资源配置参数的部分连续的频带。即，一个宽带中可以包含多个部分带宽，每个部分带宽内的资源具有相同的资源配置参数。子带可以参考现有协议(例如，LTE协议)中的定义，一个宽带中可以包含多个子带，该宽带内的多个子带具有相同的资源配置参数(numerology)。另外，子带也可以定义在一个部分带宽中，该部分带宽分布于宽带中，本申请对此并未特别限定。
图5示出了该多个物理资源组在系统带宽内连续分布的情形。图5中示出的是该第一参考信号承载于4个PRG中的一例，该4个PRG在系统带宽内连续分布，因此，PRG#1和PRG#2、PRG#2和PRG#3、PRG#3和PRG#4都分别为相邻的物理资源组。由图可以看到，任意两个相邻的物理资源组对应的预编码矩阵是不同的。
若该多个物理资源组在系统带宽内离散分布，则该多个物理资源组可以分布于宽带内的部分不连续的资源中，也可以分布于多个不连续的子带，或者，也可以分布于不连续的部分带宽。例如，图6示出了该多个物理资源组在系统带宽内离散分布的情形。图6中所示的是该第一参考信号承载于6个PRG中的一例，该6个PRG在系统带宽内离散分布，其中，PRG#1～PRG#4连续分布于一个子带(例如，子带1)，PRG#5和PRG#6连续分布于另一个子带(例如，子带2)，但子带1和子带2并不连续，此情况下，可以认为PRG#1和PRG#2、PRG#2和PRG#3、PRG#3和PRG#4、PRG#4和PRG#5以及PRG#5和PRG#6都分别为相邻的物理资源组。由图可以看到，任意两个相邻的物理资源组对应的预编码矩阵是不同的。因此，可以理解，上文中所描述的任意两个相邻的物理资源组并不一定在物理资源上连续分布。
在步骤320中，该网络设备通过该多个物理资源组向终端设备发送预编码后的第一参考信号。
对应地，在步骤320中，该终端设备在该多个物理资源组上接收该网络设备发送的预编码后的第一参考信号。
具体地，网络设备在对该第一参考信号进行预编码轮询得到预编码后的第一参考信号之后，便可以将该预编码后的第一参考信号映射到对应的RE上，以通过物理资源传输给终端设备。
在本发明实施例中，该多个物理资源组与预编码向量之间的对应关系可以是网络设备预先配置的，例如图5或图6中所示，PRG#1、PRG#3和PRG#5对应了预编码向量#1，PRG#2、PRG#4和PRG#6对应了预编码向量#2。并且，网络设备可以将该资源配置信息通知给终端设备，以便于终端设备在相应的物理资源上接收预编码后的第一参考信号。
可选地，该方法300还包括：
该网络设备向该终端设备发送资源配置信息，该资源配置信息用于承载该第一参考信号的时频资源。
在步骤330中，终端设备根据接收到的预编码后的第一参考信号，进行下行信道的CSI测量。
应理解，终端设备根据接收到的预编码后的第一参考信号进行CSI测量的具体过程可以与现有技术中终端设备进行CSI测量的具体过程相似，为了简洁，这里省略对终端设备进行CSI测量的具体过程的描述。需要注意的是，该终端设备接收到的预编码后的第一参考信号是采用至少两个预编码向量进行预编码轮询后得到的，因此，基于不同的预编码向量，可以测量得到不同的等效信道矩阵。
可选地，在步骤330中，终端设备可以基于预编码轮询参数组中的各参数和接收到的预编码后的第一参考信号，进行下行信道的CSI测量。
该预编码轮询参数组中的参数在步骤310中已经详细说明，为了避免重复，这里不再赘述。
下面结合具体的实施例，说明终端设备获取预编码轮询参数的具体过程。
在本发明实施例中，终端设备可以通过以下任意一种方式获取上述预编码轮询参数组中的参数：
方式一：该预编码轮询参数组中的至少一个参数预先配置于该网络设备和该终端设备 中；
方式二：该网络设备向该终端设备发送预编码轮询参数的指示信息(为便于区分和说明，记作第一指示信息)。
在方式一中，该预编码轮询参数组中的至少一个参数可以预先定义，例如，在协议中定义。网络设备和终端设备中可以预先配置该预先定义的至少一个参数，例如，该预先定义的至少一个参数可以分别预先保存在网络设备和终端设备的存储器中，以便于网络设备和终端设备分别在执行相应的步骤时从存储器中获取该预先定义的参数。
具体地，协议中可以预先定义该预编码轮询参数组中的全部参数，网络设备可以基于该预编码轮询参数组中的参数对第一参考信号进行预编码轮询，终端设备可以基于该预编码轮询参数组中的参数，对承载该预编码后的第一参考信号的时频资源进行划分，得到多个资源组(可以理解，该多个资源组与至少两个预编码向量对应)，然后对接收到的预编码后的第一参考信号进行CSI测量，得到与该多个资源组一一对应的多个等效信道矩阵。
或者，协议中也可以预先定义该预编码轮询参数组中的部分参数，例如，预先定义预编码轮询数目y。因此，网络设备在对第一参考信号进行预编码轮询之前，可以预先确定预编码轮询粒度x，并基于预编码轮询数目y和预编码轮询粒度x，对该第一参考信号进行预编码轮询。在这种情况下，方式一可以与方式二结合使用。即，可选地，网络设备还可以向终端设备发送预编码轮询粒度x的指示信息(即，第一指示信息的一例)，终端设备在接收到该预编码后的第一参考信号和预编码轮询粒度x的指示信息时，便可以根据预先定义的预编码轮询数目y和指示信息所指示的预编码轮询粒度x，对承载该预编码后的第一参考信号的时频资源进行划分，得到多个资源组，然后根据接收到的预编码后的第一参考信号进行CSI测量，得到与该多个资源组一一对应的多个等效信道矩阵。
在方式二中，该预编码轮询参数组中的至少一个参数可以由网络设备确定，并通过第一指示信息通知终端设备。
可选地，该网络设备向终端设备发送第一指示信息，该第一指示信息包括：预编码轮询参数组的索引，或者预编码轮询参数组中的至少一个参数。
也就是说，网络设备向终端设备发送第一指示信息的具体内容可以为以下任意一种：
a、预编码轮询参数组的索引；
b、预编码轮询参数组中的全部参数；
c、预编码轮询参数组中的部分参数。
具体地，网络设备可以通过第一指示信息向终端设备通知预编码轮询参数组的索引，以减小指示信息带来的开销；或者，网络设备也可以直接向终端设备通知预编码轮询参数，以减少终端设备需预先保存预编码轮询参数组与索引的一一对应关系带来的内存开销。
例如，该多个预编码轮询参数组可以由协议定义，并且该多个预编码轮询参数组与索引的一一对应关系被预先保存在该网络设备和终端设备中；或者，该多个预编码轮询参数组与索引的一一对应关系可以由网络设备预先定义并保存，终端设备可以从网络设备获取该多个预编码轮询参数组与索引的一一对应关系，当网络设备采用了该多个预编码轮询参数组中的任意一个参数组中，便可以通过第一指示信息向终端设备指示该被采用的参数组的索引。
可选地，该网络设备向终端设备发送第一指示信息的具体方法可以包括以下任意一 种：
该网络设备向终端设备发送无线资源控制(radio resource control，RRC)消息，该RRC消息中携带该第一指示信息；
该网络设备向终端设备发送媒体接入控制(media access control，MAC)控制元素(control element，CE)，该MAC CE中携带该第一指示信息；或者，
该网络设备向该终端设备发送物理下行控制信道(physical downlink control channel，PDCCH)，该PDCCH中携带该第一指示信息。具体地，该第一指示信息承载在PDCCH中的DCI中。
在一个可能的实施例中，该第一指示信息可以包括两部分信息，分别承载于RRC消息和DCI中。具体地，该网络设备可以通过RRC消息向终端设备发送多个预编码轮询参数组与索引的一一对应关系，该多个预编码轮询参数组可以为网络设备预先定义的全部或部分预编码轮询参数组，在网络设备采用了其中的任意一个参数组对第一参考信号进行预编码轮询时，网络设备通过DCI向终端设备发送第一指示信息，以向终端设备指示该被采用的参数组的索引。
应理解，上述列举的用于承载第一指示信息的具体消息仅为示例性说明，而不应对本申请构成任何限定，本申请也并不排除通过其他的信令携带第一指示信息的可能。
在一种可能的设计中，该第一指示信息可以配置于网络设备向终端设备发送的资源配置信息中。
具体地，该资源配置信息用于向终端设备指示承载预编码后的第一参考信号的时频资源，终端设备可以根据该资源配置信息在相应的时频资源上接收预编码后的第一参考信号。
可选地，该资源配置信息可以包括以下任意一种：
a、该第一参考信号的资源配置信息；
b、该多个物理资源组中承载的多个参考信号的资源配置信息；
c、参考信号资源组中承载的多个参考信号的资源配置信息，该参考信号资源组包括该多个物理资源组，该参考信号资源组中承载的多个参考信号对应相同的预编码轮询参数。
具体地，资源配置信息所包含的信息可以为上述a、b、c中的任意一种。
当资源配置信息包括a时，该网络设备可以针对每个参考信号发送相应的资源配置信息。也就是说，参考信号、参考信号的资源配置信息以及参考信号的预编码轮询参数之间一一对应。
当资源配置信息包括b时，该网络设备可以针对承载于相同的物理资源组中的多个参考信号发送资源配置信息。在本发明实施例中，该相同的物理资源组可以为上述多个物理资源组，因此，该多个物理资源组中承载的多个参考信号包括上述第一参考信号。也就是说，根据一个资源配置信息可以确定相同的物理资源组中的多个参考信号的时频资源，并且，由于该多个物理资源组为一个参考信号资源，该参考信号资源中承载的多个参考信号配置的预编码轮询参数可以是相同的。
当资源配置信息包括c时，该网络设备可以针对包含该多个物理资源组的参考信号资源组(例如，CSI-RS资源组(CSI-RS resource set))中承载的多个参考信号发送资源配 置信息。在本发明实施例中，由于该多个物理资源组中承载第一参考信号，故该资源集合中承载的多个参考信号包括该第一参考信号。并且，该参考信号资源组中的物理资源组承载的多个参考信号配置的预编码轮询参数可以是相同的。
可选地，该网络设备向终端设备发送第一指示信息的具体方法可以包括以下任意一种：
该网络设备向终端设备发送RRC消息，该RRC消息中包括资源配置信息，该资源配置信息中携带该第一指示信息；
该网络设备向终端设备发送MAC CE，该MAC CE中包括资源配置信息，该资源配置信息中携带该第一指示信息；或者
该网络设备向终端设备发送DCI，该DCI中包括资源配置信息，该资源配置信息中携带该第一指示信息。
在另一种可能的设计中，该第一指示信息可以配置于网络设备向终端设备发送的CSI报告配置信息中。
具体地，该CSI报告配置信息用于向终端设备指示上报的测量报告的具体内容。例如，若该第一参考信号为CSI-RS，则该测量报告可以为CSI测量报告。网络设备可以指示终端设备上报PMI、RI和CQI中的一个或多个，或者，可选地，CSI还可以包括其他CSI参数、CSI类型等。
可选地，该方法300还包括：
终端设备根据CSI报告配置信息，向网络设备发送基于第一参考信号测量得到的测量报告。
在再一种可能的设计中，该第一指示信息可以配置于网络设备向终端设备发送的CSI测量配置信息中。
可选地，所述CSI测量配置信息包括以下至少一项：CSI、资源配置指示、待测量信道的数量、带测量干扰的信道、CSI报告配置指示。
具体地，CSI测量配置信息用于指示资源配置信息与CSI报告配置信息之间的对应关系。例如，资源配置信息、CSI报告配置信息和CSI测量配置信息可以携带相同的索引(index)。CSI测量配置信息可以指示具有相同索引的资源配置信息和CSI报告配置信息所针对的参考信号(例如，第一参考信号)，资源配置信息则指示了配置的时频资源，CSI报告配置信息则可以指示需要上报的CSI。根据CSI测量配置信息，可以确定资源配置信息和CSI报告配置信息分别是针对哪个参考信号的。
可选地，该网络设备向终端设备发送第一指示信息的具体方法可以包括以下任意一种：
该网络设备向终端设备发送RRC消息，该RRC消息中包括CSI报告配置信息，该CSI报告配置信息中携带该第一指示信息；
该网络设备向终端设备发送MAC CE，该MAC CE中包括CSI报告配置信息，该CSI报告配置信息中携带该第一指示信息；或者
该网络设备向终端设备发送DCI，该DCI中包括CSI报告配置信息，该CSI报告配置信息中携带该第一指示信息。
应理解，上述列举的两种可能的设计以及用于承载该第一指示信息的具体信令仅为示 例性说明，网络设备也可以通过独立的信令来发送第一指示信息，本申请对此并未特别限定。
由此，网络设备通过上述列举的各种方式向终端设备发送第一指示信息，以向网络设备指示预编码轮询参数，终端设备可以根据预编码轮询参数，以及在各个物理资源组上接收到的预编码后的第一参考信号，进行下行信道的CSI测量。
可选地，该方法300还包括：
该网络设备向该终端设备发送预编码模式的指示信息(为便于区分和说明，记作地二指示信息)。
具体地，该网络设备可以自行决定是否采用预编码轮询的模式对第一参考信号进行预编码。例如，当终端设备处于静止或者移动性较低的时候，终端设备能够获取准确的信道状态，此情况下，该网络设备可以采用未经过预编码的参考信号或者波束赋形的参考信号来进行信道测量；当终端设备处于高速移动的时候，终端设备可能无法获取准确的信道状态，此情况下，该网络设备可以采用预编码轮询的模式发送参考信号。因此，网络设备可以向终端设备发送第二指示信息，以指示该第一参考信号是否采用了预编码轮询模式。
可选地，该网络设备可以通过显示指示的方法来向终端设备指示是否采用了预编码轮询模式。即，通过一个指示域来指示该第二指示信息。例如，该第二指示信息可以为预编码模式的索引。例如，该第二指示信息可以为一个比特位的指示域，当该比特位置为“0”时，则说明未采用预编码轮询模式，当该比特位置为“1”时，则说明采用了预编码轮询模式。
可选地，该网络设备可以通过隐式指示的方法来向终端设备指示是否采用了预编码轮询模式。即，不为该第二指示信息配置单独的指示域，而通过现有的用于指示其他信息的指示域来隐式地指示。可以利用预编码轮询参数组的两个参数的指示位联合指示的方式指示是否采用了预编码轮询模式。例如，假设预编码轮询参数组中的两个参数分别对应了2个比特的指示为，若该两个2比特指示位均为“00”，则认为为采用预编码轮询模式，若两个2比特指示位中至少有一个不为“00”，则认为采用了预编码轮询模式。在此情况下，第二指示信息和第一指示信息为同一个指示信息。
可选地，该网络设备向终端设备发送第二指示信息的具体方法可以包括以下任意一种：
该网络设备向终端设备发送RRC消息，该RRC消息中携带该第二指示信息；
该网络设备向终端设备发送MAC CE，该MAC CE中携带该第二指示信息；或者，
该网络设备向该终端设备发送PDCCH，该PDCCH中携带该第二指示信息。具体地，该第二指示信息承载在PDCCH中的DCI中。
再进一步地，可选地，该网络设备向终端设备发送第二指示信息的具体方法可以包括以下任意一种：
该网络设备向终端设备发送RRC消息，该RRC消息中包括资源配置信息，该资源配置信息中携带该第二指示信息；
该网络设备向终端设备发送MAC CE，该MAC CE中包括资源配置信息，该资源配置信息中携带该第二指示信息；或者
该网络设备向终端设备发送DCI，该DCI中包括资源配置信息，该资源配置信息中携 带该第二指示信息。
可选地，该网络设备向终端设备发送第二指示信息的具体方法可以包括以下任意一种：
该网络设备向终端设备发送RRC消息，该RRC消息中包括CSI报告配置信息，该CSI报告配置信息中携带该第二指示信息；
该网络设备向终端设备发送MAC CE，该MAC CE中包括CSI报告配置信息，该CSI报告配置信息中携带该第二指示信息；或者
该网络设备向终端设备发送DCI，该DCI中包括CSI报告配置信息，该CSI报告配置信息中携带该第二指示信息。
用于承载该第二指示信息的具体信令可以与承载第一指示信息的具体信令相同或不同，例如，该第一指示信息和第二指示信息都可以承载于资源配置信息中；或者，该第二指示信息可以承载于资源配置信息中，该第一指示信息可以承载于CSI报告配置信息中；或者，该第一指示信息可以包含两部分信息，分别承载于RRC消息和DCI中，该第二指示信息可以承载于DCI中。本申请对此并未特别限定。
另外，网络设备也可以仅向终端设备发送第一指示信息或第二指示信息。例如，若网络设备未采用预编码轮询模式，则该网络设备可以向终端设备仅发送第二指示信息，用于通知终端设备未采用预编码轮询模式，此情况下，网络设备不需要向终端设备发送第一指示信息；或者，若网络设备采用了预编码轮询模式，并且预编码轮询参数由网络设备配置，则该网络设备可以向终端设备发送第一指示信息，用于通知终端设备所采用的的预编码轮询参数，此情况下，网络设备可以不向终端设备发送第二指示信息，因为，终端设备在接收到第一指示信息所指示的预编码轮询参数时便可以确定网络设备采用了预编码轮询模式。
由于网络设备采用了预编码轮询的方法对第一参考信号进行预编码，该预编码后的第一参考信号虽然承载于多个物理资源组，但不相邻的资源组之间所采用预编码向量可能是相同的。例如，图5中示出，PRG#1和PRG#3对应了相同的预编码向量，即，预编码向量#1，PRG#2和PRG#4对应了相同的预编码向量，即，预编码向量#2。因此终端设备在获取了为该第一参考信号配置的预编码轮询参数之后，便可以将对应相同的预编码向量的物理资源组绑定在一起进行信道测量。
可选地，在一种可能的实现方式中，步骤330具体包括：
该终端设备根据预编码轮询参数组中的各参数，对多个物理资源组中的资源进行划分，得到至少两个资源组集合，所述至少两个资源组集合与至少两个预编码矩阵一一对应；
所述终端设备分别在该至少两个资源组集合上对接收到的预编码后的第一参考信号进行下行信道的CSI测量。
当然，终端设备也可以根据预编码轮询参数组中的各参数，以及各个物理资源组中承载的预编码后的第一参考信号，独立地进行下行信道的CSI测量。本申请对此并未特别限定。
此后，终端设备可以将对应相同预编码向量的物理资源组的测量结果进行处理，例如，对应相同预编码向量的等效信道取平均，或者对应相同预编码向量的其他信道参数取平均。本申请对于终端设备对测量结果的处理方法并未特别限定。
因此，本发明实施例通过网络设备采用至少两个预编码向量对第一参考信号进行预编码轮询，使得同一个参考信号可以采用至少两个预编码向量进行CSI测量，也就是对与不同预编码向量对应的等效信道的测量，以获得更多等效信道的测量效果，从而有利于提高网络设备调度的灵活性和空间自由度；另一方面，为预编码轮询的传输方案提供用于轮询的预编码矩阵，保证数据的可靠传输，提高传输系统的鲁棒性；再一方面，由于采用了预编码轮询的方式对第一参考信号进行预编码，相比于非轮询的情况，能够更加公平地测量信道，由于将两个距离比较接近的资源(例如图4中示出的PRG#1和PRG#2)采用了不同的预编码向量(例如图5中示出的预编码向量#1和预编码向量#2)去测量，也就是对于相同的资源(例如图4中所示出的PRG#1和PRG#2组成的资源)采用了不同的预编码向量(例如对应于图5中示出的预编码向量#1和预编码向量#2)去测量，同时每隔一段频率(例如，图5中示出的PRG#1和PRG#3)使用相同的预编码向量(例如图5中所示出的预编码向量#1)测量一次，也就是在每个带宽小粒度上得以测量，由此测量得到的测量结果更加准确，更有利于数据的可靠传输，有利于提高传输系统的鲁棒性。
对于该多个物理资源组中承载的多个参考信号而言，网络设备可以采用至少两个预编码矩阵对该多个参考信号进行预编码轮询，从而获得与不同预编码矩阵对应的等效信道的测量效果。
以上，结合附图详细说明了本发明实施例提供的发送和接收第一参考信号的具体过程。以下，结合附图详细说明本发明另一实施例提供的发送和接收第二参考信号的具体过程。
图7是从设备交互的角度示出的本发明另一实施例提供的发送和接收第二参考信号的方法400的示意性流程图。如图所示，图7中示出的方法400可以包括步骤410至步骤430。下面结合图7对方法400进行详细描述。
在步骤410中，终端设备采用至少两个预编码向量对第二参考信号进行预编码轮询，得到预编码后的第二参考信号。
具体地，终端设备采用至少两个预编码向量对第二参考信号进行预编码轮询的具体方法与上文中方法300中步骤310中网络设备采用至少两个预编码向量对第一参考信号进行预编码轮询的具体方法相同，为了避免重复，这里不再赘述。
在本发明实施例中，第二参考信号为用于进行上行信道测量的参考信号。例如，第二参考信号可以为SRS。
可选地，步骤410具体包括：
终端设备基于预编码轮询参数组中的各参数，采用所述至少两个预编码向量对所述第二参考信号进行预编码轮询。
其中，预编码轮询参数组至少包括：预编码向量的数目和预编码轮询的粒度。
在本发明实施例中，终端设备可以通过以下任意一种方式获取上述预编码轮询参数组中的参数：
方式一：该预编码轮询参数组中的至少一个参数预先配置于该网络设备和该终端设备中。
即，该预编码轮询参数组中的至少一个参数预先配置在终端设备和网络设备中。
方式二：该网络设备向该终端设备发送预编码轮询参数的指示信息(为便于区分和说 明，记作第三指示信息)。
即，终端设备接收网络设备发送的第三指示信息，该第三指示信息包括：预编码轮询参数组的索引，或者，预编码轮询参数组中的至少一个参数。
可选地，该方法400还包括：
网络设备向终端设备发送资源配置信息，该资源配置信息指示用于承载预编码后的第二参考信号的时频资源。
终端设备在接收到资源配置信息之后，便可以确定用于承载预编码后的第二参考信号的时频资源，从而使用该时频资源发送预编码后的第二参考信号。
可选地，该资源配置信息包括以下任意一种：
该第二参考信号的资源配置信息；
该多个物理资源组中承载的多个参考信号的资源配置信息；或者，
资源集合中承载的多个参考信号的资源配置信息，该资源集合包括该多个物理资源组，该资源集合中承载的多个参考信号对应相同的预编码轮询参数。
可选地，该第三指示信息配置于资源配置信息中。
可选地，该方法400还包括：
终端设备接收网络设备发送的第四指示信息，该第四指示信息用于指示终端设备是否采用预编码轮询模式。
可选地，该第四指示信息配置于资源配置信息中。
在步骤420中，该终端设备向网络设备发送预编码后的第二参考信号。
相对应地，在步骤420中，网络设备接收终端设备发送的预编码后的第二参考信号。
由于网络设备为终端设备配置了发送第二参考信号的时频资源，网络设备可以直接在该时频资源上接收预编码后的第二参考信号。
在本发明实施例中，该网络设备为终端设备配置的用于承载预编码后的第二参考信号的资源可以为多个物理资源组，该多个物理资源组与至少两个预编码向量对应，第二参考信号在同一个物理资源组中对应了一个预编码向量，且任意两个相邻的物理资源组对应的预编码向量不同。
另外，该多个物理资源组可以构成一个参考信号资源集合，用于承载一个或多个参考信号。该参考信号资源集合中承载的多个参考信号在同一个物理资源组中对应了一个预编码矩阵，且任意两个相邻的物理资源组对应的预编码矩阵不同。其中，预编码矩阵的每个列向量对应了一个参考信号，即，对应了一个天线端口。
应理解，预编码轮询参数的具体内容以及与多个物理资源组之间的关系在方法300中已经结合附图详细说明，为了避免重复，这里不再赘述。
在步骤430中，该网络设备根据接收到的预编码后的第二参考信号进行上行信道的CSI测量。
可选地，步骤430具体包括：
网络设备根据预编码轮询参数组中的各参数，以及接收到的预编码后的第二参考信号，进行上行信道的CSI测量。
网络设备可以根据预编码轮询参数组中的各参数，以及在各个物理资源组上接收到的预编码后的第二参考信号，进行上行信道的CSI测量。网络设备在各个物理资源组上进行 上行信道的CSI测量的具体方法可以与现有技术中网络设备进行上行信道的CSI测量的具体方法相同，为了简洁，这里省略对其具体过程的详细说明。
可选地，该方法400还包括：
网络设备根据上行信道的信道状态信息确定下行信道的信道状态信息。
在时分双工(time division duplex，TDD)模式中，网络设备可利用信道互易性，根据上行信道的信道状态信息来确定下行信道的信道状态信息。在这种情况下，该网络设备测量得到的上行信道的信道状态信息就可以用于确定下行信道的信道状态信息。
当然，上述网络设备测量得到的上行信道的信道状态信息可以不仅限于用于进行下行信道的信道状态信息，还可以用于向终端设备指示上行信道的信道状态信息，以便于终端设备进行上行数据传输。
可选地，该方法400还包括：
网络设备向终端设备发送上行信道的信道状态信息。
网络设备在进行了上行信道的CSI测量之后，便可以根据测量得到的测量结果向终端设备发送上行信道的信道状态信息，以便于终端设备基于网络设备所指示的上行信道的信道状态信息，进行数据传输。
因此，本发明实施例通过终端设备采用至少两个预编码向量对第二参考信号进行预编码轮询，可以实现对第二参考信采用至少两个预编码向量进行CSI测量，也就是对与不同预编码向量对应的等效信道的测量，从而获得不同等效信道的测量效果。网络设备测量得到的上行信道的CSI可以用于指示给终端设备，以便于终端设备进行上行传输，也可以通过信道互易性确定下行信道的CSI，以便于进行下行传输。因此，相比于现有技术而言，本申请的技术方案能够获得更多的测量结果，有利于提高网络设备调度的灵活性和空间自由度；另一方面，为预编码轮询的传输方案提供用于轮询的预编码矩阵，保证数据的可靠传输，提高传输系统的鲁棒性；再一方面，由于采用了预编码轮询的方式对第二参考信号进行预编码，相比于非轮询的情况，能够更加公平地测量信道，由于将两个距离比较接近的资源采用了不同的预编码向量去测量，也就是对于相同的资源采用了不同的预编码向量去测量，同时每隔一段频率使用相同的预编码向量测量一次，也就是在每个带宽小粒度上得以测量，由此测量得到的测量结果更加准确，更有利于数据的可靠传输，有利于提高传输系统的鲁棒性。
以上，结合图3至图7详细说明了本发明实施例提供的发送和接收参考信号的方法。以下，结合图8至图13详细说明本发明实施例提供的网络设备和终端设备。
图8是本发明实施例提供的网络设备10的示意性框图。如图8所示，该网络设备10包括：处理模块11和发送模块12。
具体地，该网络设备10可对应于根据本发明实施例的发送和接收参考信号的方法300中的网络设备，该网络设备10可以包括用于执行图3中发送和接收参考信号的方法300的网络设备执行的方法的模块。并且，该网络设备10中的各模块和上述其他操作和/或功能分别为了实现图3中发送和接收参考信号的方法300的相应流程，为了简洁，在此不再赘述。
图9是本发明实施例提供的终端设备20的示意性框图。如图9所示，该终端设备20包括：接收模块21和处理模块22。
具体地，该终端设备20可对应于根据本发明实施例的发送和接收参考信号的方法300中的终端设备，该终端设备20可以包括用于执行图3中发送和接收参考信号的方法300的终端设备执行的方法的模块。并且，该终端设备20中的各模块和上述其他操作和/或功能分别为了实现图3中发送和接收参考信号的方法300的相应流程，为了简洁，在此不再赘述。
图10是本发明另一实施例提供的终端设备30的示意性框图。如图10所示，该终端设备30包括：处理模块31和发送模块32。
其中，该处理模块31用于采用至少两个预编码向量对第二参考信号进行预编码轮询，得到预编码后的第二参考信号，该预编码后的第二参考信号由多个物理资源组承载，且任意两个相邻的物理资源组承载的信号对应的预编码向量不同；
该发送模块32用于向该网络设备发送该预编码后的第二参考信号，该第二参考信号用于该网络设备进行上行信道的信道状态信息CSI测量。
可选地，该处理模块31具体用于基于预编码轮询参数组中的各参数，采用该至少两个预编码向量对该第二参考信号进行预编码轮询。；
可选地，该预编码轮询参数组至少包括：预编码向量的数目和预编码轮询的粒度。
可选地，该预编码轮询参数组中的至少一个参数预先配置在该网络设备和该终端设备中。
可选地，该终端设备30还包括接收模块，用于接收该网络设备发送的第三指示信息，该第三指示信息包括：预编码轮询参数组的索引，或者，预编码轮询参数组中的至少一个参数。
可选地，该接收模块还用于接收该网络设备发送的第四指示信息，该第四指示信息用于指示该终端设备是否采用预编码轮询模式。
具体地，该终端设备30可对应于根据本发明实施例的发送和接收参考信号的方法400中的终端设备，该终端设备30可以包括用于执行图7中发送和接收参考信号的方法400的终端设备执行的方法的模块。并且，该终端设备30中的各模块和上述其他操作和/或功能分别为了实现图7中发送和接收参考信号的方法400的相应流程，为了简洁，在此不再赘述。
图11是本发明另一实施例提供的网络设备40的示意性框图。如图11所示，该网络设备40包括：接收模块41和处理模块42。
其中，该接收模块41用于通过多个物理资源组接收终端设备发送的预编码后的第二参考信号，任意两个相邻的物理资源组承载的信号对应的预编码向量不同；
该处理模块42用于根据该预编码后的第二参考信号进行上行信道的CSI测量。
可选地，该处理模块42具体用于根据预编码轮询参数组中的各参数以及该预编码后的第二参考信号进行上行信道的CSI测量。
可选地，该预编码轮询参数组至少包括：预编码向量的数目和预编码轮询的粒度。
可选地，该预编码轮询参数组中的至少一个参数预先配置在该网络设备和该终端设备中。
可选地，该网络设备40还包括发送模块，用于向该终端设备发送第三指示信息，该第三指示信息包括：预编码轮询参数组的索引，或者，预编码轮询参数组中的至少一个参 数。
可选地，该发送模块还用于向该终端设备发送第四指示信息，该第四指示信息用于指示该终端设备是否采用预编码轮询模式。
具体地，该网络设备40可对应于根据本发明实施例的发送和接收参考信号的方法400中的网络设备，该网络设备40可以包括用于执行图7中发送和接收参考信号的方法400的终端设备执行的方法的模块。并且，该网络设备40中的各模块和上述其他操作和/或功能分别为了实现图7中发送和接收参考信号的方法400的相应流程，为了简洁，在此不再赘述。
图12是本发明实施例提供的网络设备50的示意性框图。如图12所示，该网络设备50包括：收发器51、处理器52和存储器53。其中，收发器51、处理器52和存储器53之间通过内部连接通路互相通信，传递控制和/或数据信号，该存储器53用于存储计算机程序，该处理器52用于从该存储器53中调用并运行该计算机程序，以控制该收发器51收发信号。其中，存储器53可以配置于处理器52中，也可以独立于处理器52。
具体地，该网络设备50可对应于根据本发明实施例的发送和接收参考信号的方法300中的网络设备，该网络设备50可以包括用于执行图3中发送和接收参考信号的方法300的网络设备执行的方法的单元。并且，该网络设备50中的各单元和上述其他操作和/或功能分别为了实现图3中发送和接收参考信号的方法300的相应流程，为了简洁，在此不再赘述。
或者，该网络设备50可对应于根据本发明实施例的发送和接收参考信号的方法400中网络设备，该网络设备50可以包括用于执行图7中发送和接收参考信号的方法400的网络设备执行的方法的单元。并且，该网络设备50中的各单元和上述其他操作和/或功能分别为了实现图7中发送和接收参考信号的方法400的相应流程，为了简洁，在此不再赘述。
图13是本发明实施例提供的终端设备60的示意性框图。如图13所示，该终端设备60包括：收发器61、处理器62和存储器63。其中，收发器61、处理器62和存储器63之间通过内部连接通路互相通信，传递控制和/或数据信号，该存储器63用于存储计算机程序，该处理器62用于从该存储器63中调用并运行该计算机程序，以控制该收发器61收发信号。其中，存储器63可以配置于处理器62中，也可以独立于处理器62。
具体地，该终端设备60可对应于根据本发明实施例的发送和接收参考信号的方法300中的终端设备，该终端设备60可以包括用于执行图3中发送和接收参考信号的方法300的终端设备的方法的单元。并且，该终端设备60中的各单元和上述其他操作和/或功能分别为了实现图3中发送和接收参考信号的方法300的相应流程，为了简洁，在此不再赘述。
或者，该终端设备60可对应于根据本发明实施例的发送和接收参考信号的方法400中的终端设备，该终端设备60可以包括用于执行图7中发送和接收参考信号的方法400的终端设备执行的方法的单元。并且，该终端设备60中的各单元和上述其他操作和/或功能分别为了实现图7中发送和接收参考信号的方法400的相应流程，为了简洁，在此不再赘述。
应理解，本发明实施例中，该处理器可以为中央处理单元(central processing unit，CPU)，该处理器还可以是其他通用处理器、数字信号处理器(digital signal processor， DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
还应理解，本发明实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的随机存取存储器(random access memory，RAM)可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。
上述实施例，可以全部或部分地通过软件、硬件、固件或其他任意组合来实现。当使用软件实现时，上述实施例可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载或执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以为通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集合的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质。半导体介质可以是固态硬盘。
应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装 置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM)、随机存取存储器(RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (20)

  1. 一种发送参考信号的方法，其特征在于，包括：
    网络设备采用至少两个预编码向量对第一参考信号进行预编码轮询，得到预编码后的第一参考信号，所述预编码后的第一参考信号由多个物理资源组承载，且任意两个相邻的物理资源组承载的信号对应的预编码向量不同；
    所述网络设备通过所述多个物理资源组向终端设备发送所述预编码后的第一参考信号，所述第一参考信号用于所述终端设备进行下行信道的信道状态信息CSI测量。
  2. 根据权利要求1所述的方法，其特征在于，所述网络设备采用至少两个预编码向量对第一参考信号进行预编码轮询，包括：
    所述网络设备基于预编码轮询参数组中的各参数，采用所述至少两个预编码向量对所述第一参考信号进行预编码轮询；
    其中，所述预编码轮询参数组至少包括：预编码向量的数目和预编码轮询的粒度。
  3. 根据权利要求2所述的方法，其特征在于，所述预编码轮询参数组中的至少一个参数预先配置在所述网络设备和所述终端设备中。
  4. 根据权利要求2或3所述的方法，其特征在于，所述方法还包括：
    所述网络设备向所述终端设备发送第一指示信息，所述第一指示信息包括：预编码轮询参数组的索引，或者，预编码轮询参数组中的至少一个参数。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述方法还包括：
    所述网络设备向所述终端设备发送第二指示信息，所述第二指示信息用于指示所述预编码后的第一参考信号是否采用了预编码轮询模式。
  6. 一种接收参考信号的方法，其特征在于，包括：
    终端设备通过多个物理资源组接收网络设备发送的预编码后的第一参考信号，任意两个相邻的物理资源组承载的信号对应的预编码向量不同；
    所述终端设备根据所述预编码后的第一参考信号进行下行信道的信道状态信息CSI测量。
  7. 根据权利要求6所述的方法，其特征在于，所述终端设备根据所述预编码后的第一参考信号进行下行信道的CSI测量，包括：
    所述终端设备根据预编码轮询参数组中的各参数以及所述预编码后的第一参考信号进行下行信道的CSI测量；
    其中，所述预编码轮询参数组至少包括：预编码向量的数目和预编码轮询的粒度。
  8. 根据权利要求7所述的方法，其特征在于，所述预编码轮询参数组中的至少一个参数预先配置在所述终端设备和所述网络设备中。
  9. 根据权利要求7或8所述的方法，其特征在于，所述方法还包括：
    所述终端设备接收所述网络设备发送的第一指示信息，所述第一指示信息包括：预编码轮询参数组的索引，或者，预编码轮询参数组中的至少一个参数。
  10. 根据权利要求6至9中任一项所述的方法，其特征在于，所述方法还包括：
    所述终端设备接收所述网络设备发送的第二指示信息，所述第二指示信息用于指示所 述预编码后的第一参考信号是否采用了预编码轮询模式。
  11. 一种网络设备，其特征在于，包括：
    处理模块，用于采用至少两个预编码向量对第一参考信号进行预编码轮询，得到预编码后的第一参考信号，所述预编码后的第一参考信号由多个物理资源组承载，且任意两个相邻的物理资源组承载的信号对应的预编码向量不同；
    发送模块，用于通过所述多个物理资源组向终端设备发送所述预编码后的第一参考信号，所述第一参考信号用于所述终端设备进行下行信道的信道状态信息CSI测量。
  12. 根据权利要求11所述的网络设备，其特征在于，所述处理模块具体用于基于预编码轮询参数组中的各参数，采用所述至少两个预编码向量对所述第一参考信号进行预编码轮询；
    其中，所述预编码轮询参数组至少包括：预编码向量的数目和预编码轮询的粒度。
  13. 根据权利要求12所述的网络设备，其特征在于，所述预编码轮询参数组中的至少一个参数预先配置在所述网络设备和所述终端设备中。
  14. 根据权利要求12或13所述的网络设备，其特征在于，所述发送模块还用于向所述终端设备发送第一指示信息，所述第一指示信息包括：预编码轮询参数组的索引，或者，预编码轮询参数组中的至少一个参数。
  15. 根据权利要求11至14中任一项所述的网络设备，其特征在于，所述发送模块还用于向所述终端设备发送第二指示信息，所述第二指示信息用于指示所述预编码后的第一参考信号是否采用了预编码轮询模式。
  16. 一种终端设备，其特征在于，包括：
    接收模块，用于接收网络设备发送的预编码后的第一参考信号，所述预编码后的第一参考信号承载于多个物理资源组中，任意两个相邻的物理资源组承载的信号对应的预编码向量不同；
    处理模块，用于根据所述预编码后的第一参考信号进行下行信道的信道状态信息CSI测量。
  17. 根据权利要求16所述的终端设备，其特征在于，所述处理模块具体用于根据预编码轮询参数组中的各参数以及所述预编码后的第一参考信号进行下行信道的CSI测量；
    其中，所述预编码轮询参数组至少包括：预编码向量的数目和预编码轮询的粒度。
  18. 根据权利要求17所述的终端设备，其特征在于，所述预编码轮询参数组中的至少一个参数预先配置在所述终端设备和所述网络设备中。
  19. 根据权利要求16或17所述的终端设备，其特征在于，所述接收模块还用于接收所述网络设备发送的第一指示信息，所述第一指示信息包括：预编码轮询参数组的索引，或者，预编码轮询参数组中的至少一个参数。
  20. 根据权利要求16至19中任一项所述的终端设备，其特征在于，所述接收模块还用于接收所述网络设备发送的第二指示信息，所述第二指示信息用于指示所述预编码后的第一参考信号是否采用了预编码轮询模式。
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