WO2018059003A1 - Procédé d'apprentissage de faisceau, terminal, et station de base - Google Patents

Procédé d'apprentissage de faisceau, terminal, et station de base Download PDF

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Publication number
WO2018059003A1
WO2018059003A1 PCT/CN2017/087509 CN2017087509W WO2018059003A1 WO 2018059003 A1 WO2018059003 A1 WO 2018059003A1 CN 2017087509 W CN2017087509 W CN 2017087509W WO 2018059003 A1 WO2018059003 A1 WO 2018059003A1
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WIPO (PCT)
Prior art keywords
downlink
training signal
base station
terminal
receive
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PCT/CN2017/087509
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English (en)
Chinese (zh)
Inventor
高秋彬
塔玛拉卡拉盖施
陈润华
李辉
李传军
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电信科学技术研究院
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Publication of WO2018059003A1 publication Critical patent/WO2018059003A1/fr

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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
    • 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
    • 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
    • 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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • 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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection

Definitions

  • the present disclosure relates to the technical field of communication applications, and in particular to a beam training method, a terminal, and a base station.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-Advanced
  • Radio access technology standards such as evolution are based on MIMO+OFDM (Orthogonal Frequency Division Multiplexing) technology.
  • the performance gain of MIMO technology comes from the spatial freedom that multi-antenna systems can obtain. Therefore, one of the most important evolution directions of MIMO technology in the development of standardization is the expansion of dimensions.
  • Rel-8 up to 4 layers of MIMO transmission can be supported.
  • Rel-9 focuses on MU-MIMO (Multi-User MIMO, Multi-User Multiple Input Multiple Output) technology, and supports up to 4 downlink data layers in MU-MIMO transmission of TM (Transmission Mode)-8 .
  • Rel-10 introduces support for 8 antenna ports to further improve the spatial resolution of channel state information, and further expands the transmission capability of SU-MIMO (Single-User MIMO, single-user multiple input multiple output) to a maximum of 8 data layers.
  • Rel-13 and Rel-14 introduce FD-MIMO technology to support 32 ports for beamforming in both full and vertical directions.
  • large-scale antenna technology is introduced in mobile communication systems.
  • fully digital large-scale antennas can have up to 128/256/512 antenna elements and up to 128/256/512 transceivers, each connected to a transceiver.
  • the terminal measures channel state information and feeds back by transmitting pilot signals up to 128/256/512 antenna ports.
  • an antenna array of up to 32/64 antenna elements can also be configured.
  • the beam is shaped to obtain a large beamforming gain to compensate for the signal attenuation caused by path loss.
  • the path loss makes the coverage of wireless signals extremely limited.
  • the coverage of wireless signals can be expanded to a practical range.
  • All-digital antenna arrays each with an independent transceiver, will greatly increase the size, cost and power consumption of the device.
  • transceiver analog-to-digital converters ADCs
  • DACs digital-to-analog converters
  • power reduction and performance improvement are limited.
  • a technical solution based on analog beamforming has been proposed. As shown in Figure 1 and Figure 2.
  • the main feature of analog beamforming is the weighted shaping of the intermediate frequency ( Figure 1) or the RF signal ( Figure 2) by a phase shifter.
  • FIG. 3 a digital analog hybrid beamforming transceiver architecture scheme is proposed, as shown in FIG.
  • the sender and the receiver respectively have with Transceivers, number of antennas at the transmitting end Receiver antenna number
  • the maximum number of parallel transport streams supported by beamforming is
  • the hybrid beamforming structure of Figure 3 balances the flexibility of digital beamforming and the low complexity of analog beamforming.
  • Both analog beamforming and digital-to-analog hybrid beamforming require adjustment of the analog beamforming weights at both ends of the transceiver so that the resulting beam can be aligned with the opposite end of the communication.
  • the weight of beamforming is usually obtained by sending a training signal.
  • the terminal needs to re-search the corresponding receiving beam for each level of the beam training signal sent by the base station, which greatly increases the duration and complexity of the beam training.
  • An object of the present disclosure is to provide a beam training method, a terminal, and a base station, which are used to solve the beam training method in the related art.
  • the terminal needs to re-search for the corresponding receiving beam for each level of the beam training signal sent by the base station, which greatly increases the number of the beam.
  • the length and complexity of beam training is to provide a beam training method, a terminal, and a base station, which are used to solve the beam training method in the related art.
  • the present disclosure provides a beam training method applied to a terminal, including:
  • the step of determining the downlink receive beam of the second beam training signal according to the mapping between the downlink transmit beam and the downlink receive beam and the configuration information of the second beam training signal sent by the base station includes:
  • the step of determining the downlink receiving beam of the second beam training signal according to the first downlink receiving beam includes:
  • the first downlink receive beam as a downlink receive beam of the second beam training signal
  • the spatial correlation between the downlink receiving beam and the first downlink receiving beam in the downlink receiving beam set is greater than a first preset threshold or a downlink receiving beam and the first downlink in the downlink receiving beam set.
  • the angular difference of the spatial pointing of the row receiving beam is within a first predetermined range.
  • the configuration information is used to indicate quasi-co-site QCL information of the training signal of the second beam training signal and the downlink transmission beam of the base station.
  • the step of receiving the second beam training signal by using the downlink receiving beam of the second beam training signal and determining the optimal downlink receiving beam includes:
  • the downlink receiving beam with the strongest received signal power is selected as the optimal downlink receiving beam.
  • the step of receiving the second beam training signal by using the downlink receiving beam of the second beam training signal and determining the optimal downlink transmitting beam includes:
  • the line receive beam is the best downlink transmit beam.
  • an embodiment of the present disclosure further provides a terminal, including:
  • a first determining module configured to determine, according to the first beam training signal sent by the base station, a downlink receiving beam corresponding to the downlink sending beam in the first downlink transmitting beam set;
  • a second determining module configured to determine, according to the correspondence between the downlink transmit beam and the downlink receive beam, and the configuration information of the second beam training signal sent by the base station, a downlink receive beam of the second beam training signal, where the configuration information is used And the information about the training signal of the second beam training signal and the downlink transmission beam of the base station, where the downlink transmission beam of the base station belongs to the first downlink transmission beam set;
  • a third determining module configured to receive the second beam training signal by using a downlink receiving beam of the second beam training signal, and determine an optimal downlink transmit beam or an optimal downlink receive beam.
  • the second determining module includes:
  • a first determining submodule configured to determine, according to configuration information of the second beam training signal sent by the base station, a downlink transmission beam of the base station related to the second beam training signal;
  • a second determining submodule configured to determine, according to the corresponding relationship between the downlink transmit beam and the downlink receive beam, a first downlink receive beam corresponding to the downlink transmit beam of the base station;
  • the third determining submodule determines, according to the first downlink receiving beam, a downlink receiving beam of the second beam training signal.
  • the third determining submodule is configured to use the first downlink receiving beam as a downlink receiving beam of the second beam training signal;
  • the spatial correlation between the downlink receiving beam and the first downlink receiving beam in the downlink receiving beam set is greater than a first preset threshold or a downlink receiving beam and the first downlink in the downlink receiving beam set.
  • the angular difference of the spatial pointing of the row receiving beam is within a first predetermined range.
  • the configuration information is used to indicate quasi-co-site QCL information of the training signal of the second beam training signal and the downlink transmission beam of the base station.
  • the third determining module is configured to select, in the downlink receiving beam of the second beam training signal, that the downlink receiving beam with the strongest received signal power is the best downlink receiving beam.
  • the third determining module is configured to select, in the downlink transmit beam of the second beam training signal, that the downlink receive beam with the strongest received signal power is the best downlink transmit beam.
  • an embodiment of the present disclosure further provides a beam training method, which is applied to a base station, and includes:
  • the step of sending the first beam training signal to the terminal includes:
  • Determining a first downlink transmit beam set where the first downlink transmit beam set includes multiple downlink transmit beams, and each downlink transmit beam corresponds to a set of beamforming weights;
  • the first beam training signal is obtained and sent to the terminal.
  • the step of sending the second beam training signal to the terminal includes:
  • the second beam training signal is obtained and sent to the terminal.
  • the step of selecting a downlink transmit beam as the downlink transmit beam of the base station in the first downlink transmit beam set includes:
  • the spatial correlation between the downlink transmit beam in the second downlink transmit beam set and the downlink transmit beam of the base station is higher than a second preset threshold, or the downlink transmit beam in the second downlink transmit beam set is sent downstream from the base station.
  • the angular difference of the spatial pointing of the beam is within a second predetermined range.
  • the configuration information is used to indicate quasi-co-site QCL information of the training signal of the second beam training signal and the downlink transmission beam of the base station.
  • an embodiment of the present disclosure further provides a base station, including:
  • a first transceiver module configured to send a first beam training signal to the terminal, and receive the terminal according to the a first recommended beam information sent by the first beam training signal, where the first beam training signal is a training signal corresponding to a downlink transmitting beam in the first downlink transmitting beam set;
  • a second transceiver module configured to send configuration information of the second beam training signal to the terminal, where the configuration information is used to indicate information about the training signal of the second beam training signal and the downlink transmission beam of the base station, where the base station sends the downlink information
  • the beam belongs to the first downlink transmit beam set
  • the third transceiver module is configured to send a second beam training signal to the terminal.
  • the first transceiver module includes:
  • a fourth determining submodule configured to determine a first downlink transmit beam set, where the first downlink transmit beam set includes multiple downlink transmit beams, and each downlink transmit beam corresponds to a set of beamforming weights;
  • the first sending submodule is configured to shape the downlink transmit beam in the first downlink transmit beam set according to a corresponding beamforming value, and obtain the first beam training signal and send the signal to the terminal.
  • the third transceiver module includes:
  • Selecting a sub-module configured to select a downlink transmit beam as a downlink transmit beam of the base station in the first downlink transmit beam set;
  • Constructing a submodule configured to construct a second downlink transmit beam set related to the downlink transmit beam of the base station
  • a second sending submodule configured to: after the downlink transmit beam in the second downlink transmit beam set is shaped according to a preset beamforming value, obtain the second beam training signal and send the signal to the terminal.
  • the selecting sub-module is configured to select, according to the first recommended beam information, a downlink transmit beam as the downlink transmit beam of the base station in the first downlink transmit beam set.
  • the spatial correlation between the downlink transmit beam in the second downlink transmit beam set and the downlink transmit beam of the base station is higher than a second preset threshold, or the downlink transmit beam in the second downlink transmit beam set is sent downstream from the base station.
  • the angular difference of the spatial pointing of the beam is within a second predetermined range.
  • the configuration information is used to indicate quasi-co-site QCL information of the training signal of the second beam training signal and the downlink transmission beam of the base station.
  • Embodiments of the present disclosure also provide a terminal, including a processor, a transceiver, and a memory;
  • the processor is configured to read a program in the memory and perform the following process:
  • the configuration information of the beam training signal is used to determine a downlink receiving beam of the second beam training signal, where the configuration information is used to indicate information about the training signal of the second beam training signal and the downlink transmission beam of the base station, where the base station downlink transmission beam Belong to the first downlink transmit beam set;
  • the transceiver is configured to receive and transmit data
  • the memory is used to store data used by the processor to perform operations.
  • Embodiments of the present disclosure also provide a base station including a processor, a transceiver, and a memory;
  • the processor is configured to read a program in the memory and perform the following process:
  • the transceiver is configured to receive and transmit data
  • the memory is used to store data used by the processor to perform operations.
  • the foregoing technical solution of the embodiment of the present disclosure determines, according to the first beam training signal sent by the base station, a downlink receiving beam corresponding to the downlink transmitting beam in the first downlink transmitting beam set; and the corresponding relationship between the downlink transmitting beam and the downlink receiving beam, and
  • the configuration information of the second beam training signal sent by the base station determines the downlink receiving beam of the second beam training signal, and the configuration information is used to indicate information about the training signal of the second beam training signal and the downlink transmission beam of the base station, where the downlink transmission beam of the base station belongs to The first downlink transmit beam set; the downlink receive beam of the second beam training signal receives the second beam training signal, and determines an optimal downlink receive beam or an optimal downlink transmit beam.
  • the downlink receiving beam of the second beam training signal is determined according to the configuration information of the second beam training signal, and the terminal does not need to use the downlink receiving beam to receive the second beam training signal, thereby accelerating the terminal searching for the receiving beam.
  • the process reduces the time and complexity required for beam training.
  • 1 is a schematic diagram of weighting shaping of an intermediate frequency signal in analog beamforming in the related art
  • FIG. 2 is a schematic diagram of weighting shaping of a radio frequency signal in analog beamforming in the related art
  • FIG. 3 is a schematic diagram of digital-analog hybrid beamforming in the related art
  • FIG. 4 is a first operational flowchart of a beam training method according to some embodiments of the present disclosure
  • FIG. 5 is a second operational flowchart of a beam training method according to some embodiments of the present disclosure.
  • FIG. 6 is a flow chart of interaction between a base station and a terminal in some embodiments of the present disclosure
  • FIG. 7 is a first structural block diagram of a terminal according to some embodiments of the present disclosure.
  • FIG. 8 is a third operational flowchart of a beam training method according to some embodiments of the present disclosure.
  • FIG. 9 is a first structural block diagram of a base station according to some embodiments of the present disclosure.
  • FIG. 10 is a second structural block diagram of a base station according to some embodiments of the present disclosure.
  • FIG. 11 is a block diagram of a second structure of a terminal according to some embodiments of the present disclosure.
  • Some embodiments of the present disclosure provide a beam training method, a terminal, and a base station.
  • the terminal needs to re-search for the corresponding receive beam for each level of the beam training signal sent by the base station, which is greatly increased.
  • a beam training method of some embodiments of the present disclosure is applied to a terminal, including:
  • Step 401 Determine, according to the first beam training signal sent by the base station, a downlink receiving beam corresponding to the downlink transmitting beam in the first downlink transmitting beam set.
  • the first beam training signal may include a training signal corresponding to each beam in the first downlink transmission beam set.
  • the first downlink transmission beam set includes N 1 downlink transmission beams, and the base station may send N 1 training.
  • the signal, N 1 training signals may be TDM, FDM, CDM multiplexing, or a combination of various multiplexing methods.
  • the terminal determines, according to the first beam training signal sent by the base station, a downlink receiving beam corresponding to part or all of the downlink transmitting beams in the first downlink transmitting beam set.
  • the terminal receives the first beam training signal, performs measurement on the first beam training signal, selects a recommended downlink transmit beam (first recommended beam), and determines a pair for each first recommended beam. Determining a downlink receive beam, or determining a corresponding downlink receive beam for each downlink transmit beam in the first downlink transmit beam set, and storing each downlink transmit beam and downlink receive beam in the first downlink transmit beam set Correspondence.
  • the terminal may separately try to receive the training signal of the downlink transmit beam by using each candidate receive beam, and select the receive beam with the strongest received signal power as the receive beam of the downlink transmit beam.
  • Step 402 Determine, according to the correspondence between the downlink transmit beam and the downlink receive beam, and the configuration information of the second beam training signal sent by the base station, a downlink receive beam of the second beam training signal, where the configuration information is used to indicate the The information about the training signal of the second beam training signal and the downlink transmission beam of the base station, where the downlink transmission beam of the base station belongs to the first downlink transmission beam set.
  • the second beam training signal includes a training signal corresponding to each of the second downlink transmission beam sets.
  • the second downlink transmission beam set is configured by the base station to select one downlink transmission beam from the first downlink transmission beam set as the base station downlink transmission beam; and construct a second downlink transmission beam set related to the base station downlink transmission beam; After the downlink transmit beam in the second downlink transmit beam set is shaped according to a preset beamforming value, the second beam training signal is obtained and sent to the terminal.
  • the foregoing configuration information may be specifically QCL information used to indicate the training signal of the second beam training signal and the base station downlink transmission beam.
  • Some embodiments of the present disclosure accelerate the process of the terminal searching for the received beam according to the QCL information between the plurality of beam training signals indicated by the base station, which reduces the complexity.
  • Step 403 Receive the second beam training signal by using a downlink receiving beam of the second beam training signal, and determine an optimal downlink transmitting beam or an optimal downlink receiving beam.
  • the downlink receiving beam with the strongest received signal power is selected as the optimal downlink receiving beam; and the downlink transmitting beam of the second beam training signal is selected.
  • the downlink receiving beam with the strongest received signal power is the best downlink transmitting beam.
  • the beam training method of the embodiment of the present disclosure determines the downlink receiving beam corresponding to the downlink transmitting beam in the first downlink transmitting beam set according to the first beam training signal sent by the base station; and according to the corresponding relationship between the downlink transmitting beam and the downlink receiving beam And determining configuration information of the second beam training signal sent by the base station, determining a downlink receiving beam of the second beam training signal, where the configuration information is used to indicate information about the training signal of the second beam training signal and the downlink transmission beam of the base station, and the downlink transmission beam of the base station Belonging to Decoding a first downlink transmit beam set; receiving a second beam training signal by using a downlink receive beam of the second beam training signal, and determining an optimal downlink receive beam or an optimal downlink transmit beam.
  • the downlink receiving beam of the second beam training signal is determined according to the configuration information of the second beam training signal, and the terminal does not need to use the downlink receiving beam to receive the second beam training signal, thereby accelerating the terminal to search for the receiving beam.
  • the process reduces the time and complexity required for beam training.
  • a beam training method of some embodiments of the present disclosure is applied to a terminal, including:
  • Step 501 Determine, according to the first beam training signal sent by the base station, a downlink receiving beam corresponding to the downlink transmitting beam in the first downlink transmitting beam set.
  • This step is the same as step 401 above, and is not described here.
  • Step 502 Determine, according to configuration information of the second beam training signal sent by the base station, a downlink transmission beam of the base station related to the second beam training signal.
  • the training signal of the downlink transmission beam of the base station related to the second beam training signal is determined according to the foregoing configuration information, and the downlink transmission beam of the base station is determined according to the training signal of the downlink transmission beam of the base station.
  • the configuration information is used to indicate information about the training signal of the second beam training signal and the downlink transmission beam of the base station in the first downlink transmission beam set, such as the second beam training signal and the first
  • the QCL information of the training signal of the downlink transmission beam of the base station in the downlink transmission beam set and the terminal may determine the downlink transmission beam of the base station related to the second beam training signal according to the configuration information sent by the base station.
  • Step 503 Determine, according to the correspondence between the downlink transmit beam and the downlink receive beam, a first downlink receive beam corresponding to the downlink transmit beam of the base station.
  • Step 504 Determine a downlink receiving beam of the second beam training signal according to the first downlink receiving beam.
  • the first downlink receiving beam is used as a downlink receiving beam of the second beam training signal; or a downlink receiving beam set related to the first downlink receiving beam is configured, and the downlink receiving beam is configured A downlink receive beam is collected as the second beam training signal.
  • the spatial correlation between the downlink receiving beam and the first downlink receiving beam in the downlink receiving beam set is greater than a first preset threshold or the downlink receiving beam in the downlink receiving beam set and the first downlink receiving
  • the angular difference of the spatial pointing of the beam is within a first predetermined range.
  • Step 505 Receive the second beam training signal by using a downlink receiving beam of the second beam training signal, and determine an optimal downlink transmitting beam or an optimal downlink receiving beam.
  • This step is the same as step 403 above, and details are not described herein again.
  • the beam training method of the embodiment of the present disclosure according to the configuration information sent by the base station, the first downlink receiving beam or the downlink receiving beam set related to the first downlink receiving beam is used as the second beam training.
  • the downlink receiving beam of the signal accelerates the process of the terminal searching for the receiving beam under the premise of ensuring the training precision, and reduces the duration of the beam training and the training complexity.
  • the above workflow includes:
  • Step 601 The base station determines a first downlink transmit beam set.
  • the base station determines the first downlink transmit beam set (referred to as the first set), assuming that there are N 1 downlink transmit beams in the first set, each downlink beam corresponds to a set of beamforming weights, and the nth beam is sent by the beam.
  • Shape weight K is the number of beam-formed antenna elements, which can be smaller than the number of antenna elements of the base station.
  • all the beams in the first downlink transmit beam set may cover an area covered by the base station.
  • Step 602 The base station sends a first beam training signal.
  • the base station can transmit one beam training signal for each downlink transmit beam in the first set.
  • the base station can transmit N 1 training signals.
  • the N 1 training signals may be TDM, FDM, CDM multiplexing, or a combination of various multiplexing modes.
  • N 1 training signals may occupy N 1 OFDM symbols, each training signal occupies 1 OFDM symbol, and the training signals are TDM multiplexed. It is also possible to transmit training signals of a plurality of beams in one OFDM symbol, and the training signals are FDM multiplexed or CDM multiplexed.
  • the signal after shaping with the nth beam is:
  • the first beam training signal may be sent periodically, and may be sent aperiodically.
  • Step 603 The terminal measures the first beam training signal, selects the first recommended beam, and reports the first recommended beam related information to the base station, and determines a downlink receiving beam corresponding to the downlink transmitting beam in the first downlink transmitting beam set.
  • the terminal receives the first training signal sent by the base station, and selects a recommended downlink transmission beam (first recommended beam) by measuring the first training signal. For example, the terminal can select the training signal receiving power The strongest beam is the recommended beam.
  • the first recommended beam is one beam or multiple beams.
  • the terminal Receiving, by the terminal, the first beam training signal, measuring the first beam training signal, selecting a recommended downlink transmit beam (first recommended beam), and determining a corresponding downlink receive beam for each first recommended beam, or for the first
  • Each downlink transmit beam in the downlink transmit beam set determines a corresponding downlink receive beam, and stores a correspondence between each downlink transmit beam and a downlink receive beam in the first downlink transmit beam set.
  • the receive beam of the terminal may be selected from candidate receive beams. Terminal sharing Receive beams, each receive beam corresponding to a set of beamforming weights, and the receive beam shaping weight of the nth beam Where L is the number of antenna elements of the beamforming, which may be smaller than the number of antenna elements of the terminal.
  • the terminal may separately try to receive each of the received beams, and select the receiving beam with the strongest received signal power as the receiving beam of the downlink transmitting beam.
  • the terminal reports the related information of the first recommended beam to the base station, where the related information includes an identifier of the first recommended beam, for example, a number of the downlink transmit beam.
  • the information of the recommended downlink transmit beam fed back by the terminal may be different according to the multiplexing mode of the downlink beam/beam training signal.
  • the downlink beamforming signal is multiplexed in different OFDM symbol symbols or frame subframes, and the terminal measures and feeds back the selected downlink time information (OFDM symbol or subframe index).
  • the downlink beamforming signal is multiplexed in different frequency resources (material resource block PRB, subband subband), and the terminal measures and feeds back the selected downlink frequency information (PRB or subband index).
  • the related information may further include downlink transmission beam training signal strength information received by the terminal, such as a received signal power level.
  • the terminal saves the downlink receiving beam corresponding to the first recommended beam.
  • the terminal needs to save the correspondence between the first recommended beam and the downlink receiving beam.
  • the terminal saves the downlink receiving beams corresponding to the beams in all the first sets, and saves the corresponding relationship.
  • the downlink receiving beam may refer to its number in all candidate downlink receiving beams, and may also refer to the weight itself of the downlink receiving beamforming.
  • Step 604 The base station determines a second downlink transmit beam set.
  • the base station selects a downlink transmission beam (base station downlink transmission beam) from the first set, and determines a second downlink transmission beam set (referred to as a second set) based on the downlink transmission beam of the base station.
  • the first base station transmit beam may be determined based on the first recommended beam related information reported by the terminal, for example, selecting the beam with the highest intensity.
  • the base station may also select the base station downlink transmission beam based on the first recommended beam information reported by the terminal.
  • the correlation between the downlink transmit beam in the second set and the downlink transmit beam of the base station is higher than a certain value, or the angular difference of the spatial direction is within a certain range.
  • the second set has one downlink transmit beam, and the downlink beam may be a base station downlink transmit beam.
  • Step 605 The base station sends configuration information of the second beam training signal.
  • the above configuration information includes time-frequency position information of the second beam training signal, and the like.
  • the configuration information further includes indication information of the downlink transmission beam of the base station, and indicates that the second beam training signal of the terminal and the beam training signal corresponding to the downlink transmission beam of the base station are for one or more spatial angle parameters (space arrival angle mean, or space arrival angle)
  • the extension, or the mean of the spatial departure angle, or the expansion of the spatial departure angle is Quasi-co-located QCL. If the two signals are QCL for a spatial angle parameter, the spatial angle parameter of the other signal can be inferred from the spatial angle parameter of one signal.
  • the second training signal may be sent periodically or non-periodically.
  • the second training signal may be a training signal of a transmitting beam or a training signal of a receiving beam (only one downlink transmitting beam in the second set).
  • Step 606 The base station sends a second beam training signal.
  • Step 607 The terminal determines, according to the configuration information of the second beam training signal, the training signal of the downlink transmission beam of the base station with the second beam training signal QCL.
  • Step 608 The terminal determines, according to the downlink receiving beam corresponding to the downlink transmitting beam in the first downlink transmitting beam set, the first downlink receiving beam corresponding to the downlink transmitting beam of the base station.
  • Step 609 The terminal determines a downlink receiving beam of the second beam training signal according to the first downlink receiving beam, and receives the second beam training signal by using a downlink receiving beam of the second beam training signal to determine The best downlink receive beam or the best downlink transmit beam.
  • the terminal may receive the second beam training signal by using the first downlink receiving beam (terminal save) corresponding to the downlink downlink transmit beam of the terminal.
  • the terminal constructs a downlink receiving beam set (referred to as a third set) based on the first downlink receiving beam corresponding to the downlink downlink transmitting beam of the terminal.
  • the terminal selects an optimal receive beam in the third set according to the second beam training signal.
  • the terminal may separately try to receive the second training signal by using each receive beam in the third set, and select the receive beam with the strongest received signal power as the best receive beam, and in the downlink transmit beam of the second beam training signal. , select the downlink receiving with the strongest received signal power
  • the beam is the best downstream transmit beam.
  • the spatial correlation between the downlink receiving beam and the first downlink receiving beam in the third set is higher than a certain value, or the angular difference of the spatial pointing is within a certain range.
  • the weight of the transmit beam may consist of oversampled DFT vectors.
  • the oversampled DFT vector has O 1 N 1 , specifically:
  • the first set may include N 1 beams, and the beam shaping weights are respectively: Then with the beam in the first set
  • the beamforming weights of the beams in the associated second set may include: There are 1 O.
  • the weight of the transmit beam can be composed of oversampled 2D DFT vectors. Assuming that the number of antenna elements of the first dimension and the second dimension are N 1 and N 2 , respectively, and the oversampling rate factors of the two dimensions are O 1 and O 2 , respectively, the oversampled DFT vector has O 1 O 2 N 1 N 2 :
  • the first set may include N 1 N 2 beams, and the beamforming weights are:
  • the beamforming weights of the beams in the associated second set may include:
  • the beam training method of the embodiment of the present disclosure according to the configuration information sent by the base station, the first downlink receiving beam or a downlink receiving beam set related to the first downlink receiving beam is used as the second beam training signal.
  • the downlink receiving beam accelerates the process of the terminal searching for the receiving beam under the premise of ensuring the training precision, and reduces the length of the beam training and the training complexity.
  • the present disclosure employs two-stage beam training to achieve a good balance between training, overhead, and accuracy.
  • some embodiments of the present disclosure further provide a terminal, including:
  • the first determining module 71 is configured to determine, according to the first beam training signal sent by the base station, a downlink receiving beam corresponding to the downlink sending beam in the first downlink transmitting beam set;
  • the second determining module 72 is configured to determine, according to the correspondence between the downlink transmit beam and the downlink receive beam, and the configuration information of the second beam training signal sent by the base station, a downlink receive beam of the second beam training signal, where the configuration information is used by And the information about the training signal of the second beam training signal and the downlink transmission beam of the base station, where the downlink transmission beam of the base station belongs to the first downlink transmission beam set;
  • the third determining module 73 is configured to receive the second beam training signal by using a downlink receiving beam of the second beam training signal, and determine an optimal downlink transmit beam or an optimal downlink receive beam.
  • the second determining module 72 includes:
  • a first determining sub-module 721, configured to determine, according to configuration information of the second beam training signal sent by the base station, a downlink transmission beam of the base station related to the second beam training signal;
  • a second determining sub-module 722 configured to determine, according to the corresponding relationship between the downlink transmit beam and the downlink receive beam, a first downlink receive beam corresponding to the downlink transmit beam of the base station;
  • the third determining sub-module 723 is configured to determine, according to the first downlink receiving beam, a downlink receiving beam of the second beam training signal.
  • the third determining submodule 723 is configured to use the first downlink receiving beam as a downlink receiving beam of the second beam training signal;
  • the spatial correlation between the downlink receive beam and the first downlink receive beam in the downlink receive beam set is greater than a first preset threshold or downlink receive in the downlink receive beam set
  • the angle difference between the beam and the spatial direction of the first downlink receive beam is within a first preset range.
  • the configuration information is used to indicate quasi-co-site QCL information of the training signal of the second beam training signal and the downlink transmission beam of the base station.
  • the third determining module 73 is configured to select, in the downlink receiving beam of the second beam training signal, that the downlink receiving beam with the strongest received signal power is the best downlink receiving beam.
  • the third determining module 73 is configured to select, in the downlink transmit beam of the second beam training signal, that the downlink receive beam with the strongest received signal power is the best downlink transmit beam.
  • the terminal of the embodiment of the present disclosure determines, according to the first beam training signal sent by the base station, a downlink receiving beam corresponding to the downlink transmitting beam in the first downlink transmitting beam set; and the corresponding relationship between the downlink transmitting beam and the downlink receiving beam, and the base station
  • the configuration information of the second beam training signal is sent to determine a downlink receiving beam of the second beam training signal, where the configuration information is used to indicate information about the training signal of the second beam training signal and the downlink transmission beam of the base station, and the downlink transmission beam of the base station belongs to the Decoding a first downlink transmit beam set; receiving a second beam training signal by using a downlink receive beam of the second beam training signal, and determining an optimal downlink receive beam or an optimal downlink transmit beam.
  • the downlink receiving beam of the second beam training signal is determined according to the configuration information of the second beam training signal, and the terminal does not need to use the downlink receiving beam to receive the second beam training signal, thereby accelerating the terminal searching for the receiving beam.
  • the process reduces the time and complexity required for beam training.
  • some embodiments of the present disclosure further provide a beam training method applied to a base station, including:
  • Step 801 Send a first beam training signal to the terminal, and receive first recommended beam information sent by the terminal according to the first beam training signal, where the first beam training signal is downlink sending in the first downlink transmitting beam set.
  • the training signal corresponding to the beam.
  • the terminal receives the first beam training signal sent by the base station, performs measurement on the first beam training signal, selects the first recommended beam, and reports the first recommended beam related information to the base station. For example, the terminal may select the training signal to receive the strongest power.
  • the beam is the recommended beam.
  • the first recommended beam is one beam or multiple beams.
  • the first recommended beam information may include an identifier of the first recommended beam, such as a number of the downlink transmit beam.
  • the information of the recommended downlink transmit beam fed back by the terminal may be different according to the multiplexing mode of the downlink beam/beam training signal.
  • the downlink beamforming signal is multiplexed in different OFDM symbol symbols or frame subframes, and the terminal measures and feeds back the selected downlink time information (OFDM symbol or subframe index).
  • the downlink beamforming signal is multiplexed in different frequency resources (material resource block PRB, subband subband), and the terminal measures and feeds back the selected downlink frequency information (PRB or subband index).
  • the related information may further include downlink transmission beam training signal strength information received by the terminal, such as a received signal power level.
  • Step 802 Send configuration information of the second beam training signal to the terminal, where the configuration information is used to indicate information about the second beam training signal and the training signal of the downlink transmission beam of the base station, where the downlink transmission beam of the base station belongs to the The first downlink transmit beam set.
  • Step 803 Send a second beam training signal to the terminal.
  • the base station sends the configuration information of the second beam training signal to the terminal, and the terminal determines, according to the correspondence relationship and the configuration information of the second beam training signal sent by the base station, the downlink receiving beam of the second beam training signal, by using the The downlink receive beam of the second beam training signal receives the second beam training signal and determines an optimal downlink receive beam or an optimal downlink transmit beam.
  • the foregoing configuration information is used to indicate quasi-co-site QCL information of the training signal of the second beam training signal and the downlink transmission beam of the base station.
  • the configuration information is specifically used to indicate that the second beam training signal of the terminal and the beam training signal corresponding to the downlink transmission beam of the base station are for one or more spatial angle parameters (space arrival angle mean, or spatial arrival angle extension, or space departure angle mean , or the expansion of the spatial starting point) is Quasi-co-located QCL. If the two signals are QCL for a spatial angle parameter, the spatial angle parameter of the other signal can be inferred from the spatial angle parameter of one signal.
  • step of sending the first beam training signal to the terminal in the foregoing step 801 includes:
  • Determining a first downlink transmit beam set where the first downlink transmit beam set includes multiple downlink transmit beams, and each downlink transmit beam corresponds to a set of beamforming weights;
  • the first beam training signal is obtained and sent to the terminal.
  • step of sending the second beam training signal to the terminal in the foregoing step 802 includes:
  • the downlink transmit beam is selected as the downlink transmit beam of the base station in the first downlink transmit beam set according to the first recommended beam information. For example, select the beam with the highest intensity.
  • the spatial correlation between the downlink transmit beam in the second downlink transmit beam set and the downlink transmit beam of the base station is higher than a second preset threshold, or the downlink transmit beam and the base station in the second downlink transmit beam set are downlink.
  • the angular difference of the spatial direction of the transmit beam is within a second predetermined range.
  • the base station sends the configuration information of the second beam training signal to the terminal, so that the base station determines the downlink receiving beam of the second beam training signal according to the configuration information,
  • the terminal needs to receive the second beam training signal by using each downlink receiving beam, which accelerates the process of the terminal searching for the receiving beam, and reduces the time and complexity required for beam training.
  • some embodiments of the present disclosure further provide a base station, including:
  • the first transceiver module 91 is configured to send a first beam training signal to the terminal, and receive first recommended beam information that is sent by the terminal according to the first beam training signal, where the first beam training signal is a first downlink transmit beam. a training signal corresponding to a downlink transmit beam in the set;
  • the second transceiver module 92 is configured to send configuration information of the second beam training signal to the terminal, where the configuration information is used to indicate information about the training signal of the second beam training signal and the downlink transmission beam of the base station, where the base station is downlink.
  • the transmit beam belongs to the first downlink transmit beam set;
  • the third transceiver module 93 is configured to send a second beam training signal to the terminal.
  • the first transceiver module 91 includes:
  • a fourth determining sub-module 911 configured to determine a first downlink transmit beam set, where the first downlink transmit beam set includes multiple downlink transmit beams, and each downlink transmit beam corresponds to a set of beamforming weights;
  • the first sending sub-module 912 is configured to perform shaping of the downlink transmit beam in the first downlink transmit beam set according to a corresponding beamforming value, and obtain the first beam training signal and send the signal to the terminal.
  • the third transceiver module 93 includes:
  • the sub-module 931 is configured to select a downlink transmit beam as the downlink transmit beam of the base station in the first downlink transmit beam set.
  • the second sending sub-module 933 is configured to perform shaping of the downlink transmit beam in the second downlink transmit beam set according to a preset beamforming value, and obtain the second beam training signal and send the signal to the terminal.
  • the selecting sub-module 931 is configured to select, according to the first recommended beam information, a downlink transmit beam as the downlink transmit beam of the base station in the first downlink transmit beam set.
  • the spatial correlation between the downlink transmit beam in the second downlink transmit beam set and the downlink transmit beam of the base station is higher than a second preset threshold, or in the second downlink transmit beam set.
  • the angular difference between the downlink transmit beam and the base station downlink transmit beam is within the second preset range.
  • the configuration information is used to indicate quasi-co-site QCL information of the training signal of the second beam training signal and the downlink transmission beam of the base station.
  • the base station of the embodiment of the present disclosure sends configuration information of the second beam training signal to the terminal, so that the base station determines the downlink receiving beam of the second beam training signal according to the configuration information, and does not need the terminal to use each downlink receiving beam to train the second beam.
  • the signal is received, which speeds up the process of the terminal searching for the receiving beam, and reduces the time and complexity required for beam training.
  • some embodiments of the present disclosure further provide a base station, where the base station includes: a processor 1000; a memory 1020 connected to the processor 1000 through a bus interface, And a transceiver 1010 coupled to the processor 1000 via a bus interface; the memory 1020 for storing programs and data used by the processor in performing operations; transmitting data information or pilots through the transceiver 1010,
  • the uplink control channel is also received by the transceiver 1010; when the processor 1000 calls and executes the program and data stored in the memory 1020, the following functional modules are implemented:
  • a first transceiver module configured to send a first beam training signal to the terminal, and receive first recommended beam information that is sent by the terminal according to the first beam training signal, where the first beam training signal is a first downlink transmit beam set a training signal corresponding to the downlink transmission beam;
  • a second transceiver module configured to send configuration information of the second beam training signal to the terminal, where the configuration information is used to indicate information about the training signal of the second beam training signal and the downlink transmission beam of the base station, where the base station sends the downlink information
  • the beam belongs to the first downlink transmit beam set
  • the third transceiver module is configured to send a second beam training signal to the terminal.
  • the processor 1000 is configured to read a program in the memory 1020, and execute the following process: sending, by the transceiver 1010, a first beam training signal to the terminal, and receiving, by the terminal, the first recommended beam information sent by the terminal according to the first beam training signal.
  • the first beam training signal is a training signal corresponding to a downlink transmission beam in the first downlink transmission beam set; and the configuration information of the second beam training signal is sent to the terminal by the transceiver 1010, where the configuration information is used to indicate the The information about the training signal of the second beam training signal and the downlink transmission beam of the base station, where the downlink transmission beam of the base station belongs to the first downlink transmission beam set; and the second beam training signal is sent to the terminal.
  • the transceiver 1010 is configured to receive and transmit data under the control of the processor 1000.
  • the bus architecture can include any number of interconnected buses and bridges, One or more processors represented by processor 1000 and various circuits of memory represented by memory 1020 are linked together.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • the transceiver 1010 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 1000 is responsible for managing the bus architecture and general processing, and the memory 1020 can store data used by the processor 1000 in performing operations.
  • the processor 1000 is configured to send, by the transceiver 1010, a first beam training signal to the terminal, and receive first recommended beam information that is sent by the terminal according to the first beam training signal;
  • the configuration information of the second beam training signal is such that the base station determines the downlink receiving beam of the second beam training signal according to the configuration information, and does not need the terminal to receive the second beam training signal by using each downlink receiving beam, thereby accelerating the process of the terminal searching for the receiving beam. , reducing the time and complexity required for beam training.
  • some embodiments of the present disclosure further provide a terminal, including: a processor 1100; a memory 1120 connected to the processor 1100 through a bus interface, and a transceiver 1110 coupled to the processor 1100 via a bus interface; the memory for storing programs and data used by the processor in performing operations; receiving a downlink control channel through the transceiver 1110;
  • a terminal including: a processor 1100; a memory 1120 connected to the processor 1100 through a bus interface, and a transceiver 1110 coupled to the processor 1100 via a bus interface; the memory for storing programs and data used by the processor in performing operations; receiving a downlink control channel through the transceiver 1110;
  • a first determining module configured to determine, according to the first beam training signal sent by the base station, a downlink receiving beam corresponding to the downlink sending beam in the first downlink transmitting beam set;
  • a second determining module configured to determine, according to the correspondence between the downlink transmit beam and the downlink receive beam, and the configuration information of the second beam training signal sent by the base station, a downlink receive beam of the second beam training signal, where the configuration information is used And the information about the training signal of the second beam training signal and the downlink transmission beam of the base station, where the downlink transmission beam of the base station belongs to the first downlink transmission beam set;
  • a third determining module configured to receive the second beam training signal by using a downlink receiving beam of the second beam training signal, and determine an optimal downlink transmit beam or an optimal downlink receive beam.
  • the processor 1100 is configured to read the program in the memory 1120, and perform the following process: determining, according to the first beam training signal sent by the base station, a downlink receiving beam corresponding to the downlink transmitting beam in the first downlink transmitting beam set; Correspondence between the transmit beam and the downlink receive beam and the base station Determining, by the configuration information of the second beam training signal, the downlink receiving beam of the second beam training signal, where the configuration information is used to indicate information about the training signal of the second beam training signal and the downlink transmission beam of the base station,
  • the downlink transmission beam of the base station belongs to the first downlink transmission beam set; the second beam training signal is received by the transceiver 1110 by using the downlink reception beam of the second beam training signal, and the optimal downlink transmission beam is determined or optimized. Downstream receive beam.
  • the transceiver 1110 is configured to receive and transmit data under the control of the processor 1100.
  • the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1100 and various circuits of memory represented by memory 1120.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • the transceiver 1110 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the user interface 1130 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
  • the processor 1100 is responsible for managing the bus architecture and general processing, and the memory 1120 can store data used by the processor 1100 in performing operations.
  • the processor 1100 is configured to determine, according to the first beam training signal sent by the base station, a downlink receiving beam corresponding to a downlink transmitting beam in the first downlink transmitting beam set; and according to the downlink transmitting beam and the downlink receiving.
  • the downlink receiving beam of the second beam training signal is determined according to the configuration information of the second beam training signal, and the terminal does not need to use the downlink receiving beam to receive the second beam training signal, thereby accelerating the terminal to search for the receiving beam.
  • the process reduces the time and complexity required for beam training.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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

Abstract

La présente invention concerne un procédé d'apprentissage de faisceau, un terminal, et une station de base, utilisés pour résoudre un problème rencontré dans le procédé d'apprentissage de faisceau de l'état de la technique associé et selon lequel, pour chaque niveau de signal d'apprentissage de faisceau envoyé par le terminal, la station de base doit rechercher de nouveau un faisceau de réception correspondant, ce qui augmente le temps et la complexité de l'apprentissage de faisceau. Le procédé selon la présente invention consiste à : d'après un premier signal d'apprentissage de faisceau envoyé par la station de base, déterminer un faisceau de réception de liaison descendante correspondant à un faisceau de transmission de liaison descendante dans un premier ensemble de faisceaux de transmission de liaison descendante; déterminer un faisceau de réception de liaison descendante d'un second signal d'apprentissage de faisceau d'après une correspondance entre le faisceau de transmission de liaison descendante et le faisceau de réception de liaison descendante et des informations de configuration du second signal d'apprentissage de faisceau envoyées par la station de base, les informations de configuration étant utilisées pour indiquer des informations associées du second signal d'apprentissage de faisceau et du signal d'apprentissage du faisceau de transmission de liaison descendante de la station de base, et le faisceau de transmission de liaison descendante de la station de base appartenant au premier ensemble de faisceaux de transmission de liaison descendante; et recevoir le second signal d'apprentissage de faisceau à l'aide du faisceau de réception de liaison descendante du second signal d'apprentissage de faisceau, et déterminer le faisceau de réception de liaison descendante optimal ou le faisceau de transmission de liaison descendante.
PCT/CN2017/087509 2016-09-30 2017-06-08 Procédé d'apprentissage de faisceau, terminal, et station de base WO2018059003A1 (fr)

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