CN107888243B

CN107888243B - Beam training method, terminal and base station

Info

Publication number: CN107888243B
Application number: CN201610875307.5A
Authority: CN
Inventors: 高秋彬; 塔玛拉卡·拉盖施; 陈润华; 李辉; 李传军
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2016-09-30
Filing date: 2016-09-30
Publication date: 2020-03-20
Anticipated expiration: 2036-09-30
Also published as: TW201815087A; TWI679857B; WO2018059003A1; CN107888243A

Abstract

The invention provides a beam training method, a terminal and a base station, and solves the problems that in the existing beam training method, the terminal needs to search corresponding receiving beams again for each level of beam training signals sent by the base station, and the beam training time and complexity are increased. The method of the invention comprises the following steps: determining a downlink receiving beam corresponding to a downlink transmitting beam in a first downlink transmitting beam set according to a first beam training signal transmitted by a base station; determining a downlink receiving beam of a second beam training signal according to the corresponding relation between the downlink transmitting beam and the downlink receiving beam and the configuration information of the second beam training signal transmitted by the base station, wherein the configuration information is used for indicating the second beam training signal and the relevant information of the training signal of the downlink transmitting beam of the base station, and the downlink transmitting beam of the base station belongs to a first downlink transmitting beam set; and receiving the second beam training signal by utilizing the downlink receiving beam of the second beam training signal, and determining the optimal downlink receiving beam or downlink transmitting beam.

Description

Beam training method, terminal and base station

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a beam training method, a terminal, and a base station.

Background

In view of the important role of MIMO (Multiple-Input Multiple-Output) technology in improving peak rate and system spectrum utilization, wireless access technology standards such as LTE (Long Term Evolution)/LTE-a (LTE-Advanced, enhanced Long Term Evolution) are constructed based on MIMO + OFDM (orthogonal frequency Division Multiplexing) technology. The performance gain of the MIMO technology comes from the space freedom degree that can be obtained by the multi-antenna system, so that one of the most important evolution directions of the MIMO technology in the standardization development process is the extension of dimension.

In LTE Rel-8, MIMO transmission of up to 4 layers can be supported. The Rel-9 is used for enhancing an MU-MIMO (Multi-user MIMO, Multi-user multiple input multiple output) technology, and a maximum of 4 downlink data layers can be supported in TM (Transmission Mode) -8 MU-MIMO Transmission. Rel-10 introduces ports supporting 8 antennas to further improve the spatial resolution of channel state information, and further extend the transmission capability of SU-MIMO (Single-User MIMO, Single-User multiple input multiple output) to at most 8 data layers. The FD-MIMO technology support is introduced into 32 ports by Rel-13 and Rel-14, and the full-dimension and vertical-direction beam forming is realized.

In order to further improve the MIMO technology, a large-scale antenna technology is introduced into a mobile communication system. For a base station, a fully digital large scale antenna may have up to 128/256/512 antenna elements and up to 128/256/512 transceivers, one for each antenna element. By transmitting pilot signals of up to 128/256/512 antenna ports, the terminal is caused to measure and feed back channel state information. For terminals, antenna arrays of up to 32/64 antenna elements may also be configured. And a huge beam forming gain is obtained by beam forming at two sides of the base station and the terminal so as to make up for signal attenuation caused by path loss. Especially in high frequency band communication, such as 30GHz frequency point, the path loss makes the coverage of wireless signals extremely limited. By the large-scale antenna technology, the coverage range of wireless signals can be expanded to a practical range.

The full digital antenna array, each antenna element has an independent transceiver, which will greatly increase the size, cost and power consumption of the device. Especially for analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) of transceivers, both power reduction and performance improvement are limited. In order to reduce the size, cost and power consumption of the device, a technical scheme based on analog beamforming is proposed. As shown in fig. 1 and 2. The analog beamforming is mainly characterized in that intermediate frequency (figure 1) or radio frequency signals (figure 2) are weighted and shaped through phase shifters.

In order to further boost the analog waveBeamforming performance, a digital-analog hybrid beamforming transceiving architecture scheme is proposed, as shown in fig. 3. In FIG. 3, the transmitting end and the receiving end have

And

number of antenna oscillators of transceiver and transmitting end

Receiving end antenna oscillator number

The maximum number of parallel transmission streams supported by beam forming is

The hybrid beamforming structure of fig. 3 balances the flexibility of digital beamforming with the low complexity of analog beamforming.

Both analog beamforming and digital-analog hybrid beamforming require adjustment of analog beamforming weights at both the transmitting and receiving ends, so that a beam formed by the analog beamforming and the digital-analog hybrid beamforming can be aligned to the opposite end of communication. The beamforming weights are typically obtained by transmitting training signals. However, in the existing beam training method, the terminal needs to search for the corresponding receiving beam again for each stage of beam training signals sent by the base station, which greatly increases the time length and complexity of beam training.

Disclosure of Invention

The invention aims to provide a beam training method, a terminal and a base station, which are used for solving the problems that in the existing beam training method, the terminal needs to search corresponding receiving beams again for each level of beam training signals sent by the base station, and the time length and the complexity of beam training are greatly increased.

In order to achieve the above object, the present invention provides a beam training method applied to a terminal, including:

determining a downlink receiving beam corresponding to a downlink transmitting beam in a first downlink transmitting beam set according to a first beam training signal transmitted by a base station;

determining a downlink receiving beam of a second beam training signal according to the corresponding relation between the downlink transmitting beam and the downlink receiving beam and configuration information of the second beam training signal transmitted by the base station, wherein the configuration information is used for indicating the second beam training signal and relevant information of the training signal of the downlink transmitting beam of the base station, and the downlink transmitting beam of the base station belongs to the first downlink transmitting beam set;

and receiving the second beam training signal by using the downlink receiving beam of the second beam training signal, and determining an optimal downlink transmitting beam or an optimal downlink receiving beam.

Wherein, the step of determining the downlink receiving beam of the second beam training signal according to the corresponding relationship between the downlink transmitting beam and the downlink receiving beam and the configuration information of the second beam training signal transmitted by the base station includes:

determining a downlink transmission beam of a base station related to a second beam training signal according to configuration information of the second beam training signal transmitted by the base station;

determining a first downlink receiving beam corresponding to the downlink transmitting beam of the base station according to the corresponding relation between the downlink transmitting beam and the downlink receiving beam;

and determining a downlink receiving beam of the second beam training signal according to the first downlink receiving beam.

Wherein the determining the downlink receive beam of the second beam training signal according to the first downlink receive beam comprises:

using the first downlink receiving beam as a downlink receiving beam of the second beam training signal; or

And constructing a downlink receiving beam set related to the first downlink receiving beam, and using the downlink receiving beam set as a downlink receiving beam of the second beam training signal.

Wherein, a spatial correlation between a downlink receiving beam in the downlink receiving beam set and the first downlink receiving beam is greater than a first preset threshold or an angle difference between spatial pointing directions of the downlink receiving beam in the downlink receiving beam set and the first downlink receiving beam is within a first preset range.

The configuration information is used to indicate the second beam training signal and quasi-co-site QCL information of the training signal of the downlink transmission beam of the base station.

Wherein the step of receiving the second beam training signal by using the downlink reception beam of the second beam training signal and determining the optimal downlink reception beam comprises:

and selecting the downlink receiving beam with the strongest received signal power as the optimal downlink receiving beam from the downlink receiving beams of the second beam training signals.

Wherein, 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 comprises:

and selecting the downlink receiving beam with the strongest received signal power as the optimal downlink transmitting beam from the downlink transmitting beams of the second beam training signals.

In order to solve the above technical problem, an embodiment of the present invention further provides a terminal, including:

a first determining module, configured to determine, according to a first beam training signal sent by a base station, a downlink receive beam corresponding to a downlink transmit beam in a first downlink transmit beam set;

a second determining module, configured to determine a downlink receive beam of a second beam training signal according to a corresponding relationship between the downlink transmit beam and the downlink receive beam and configuration information of the second beam training signal sent by the base station, where the configuration information is used to indicate information related to the second beam training signal and a training signal of a downlink transmit beam of the base station, and the downlink transmit beam of the base station belongs to the first downlink transmit beam set;

a third determining module, configured to receive the second beam training signal by using a downlink receive beam of the second beam training signal, and determine an optimal downlink transmit beam or an optimal downlink receive beam.

Wherein the second determining module comprises:

the first determining submodule is used for determining a downlink transmitting beam of the base station related to a second beam training signal according to the configuration information of the second beam training signal transmitted by the base station;

a second determining submodule, configured to determine, according to a correspondence between the downlink transmission beam and a downlink reception beam, a first downlink reception beam corresponding to the downlink transmission beam of the base station;

and a third determining submodule configured to determine a downlink receive beam of the second beam training signal according to the first downlink receive beam.

Wherein the third determining submodule is configured to use the first downlink receive beam as a downlink receive beam of the second beam training signal; or

The third determining module is configured to select, as the best downlink receive beam, the downlink receive beam with the strongest received signal power among the downlink receive beams of the second beam training signals.

The third determining module is configured to select, as the optimal downlink transmit beam, the downlink receive beam with the strongest received signal power among the downlink transmit beams of the second beam training signals.

In order to solve the above technical problem, an embodiment of the present invention further provides a beam training method, applied to a base station, including:

sending a first beam training signal to a terminal, and receiving first recommended beam information sent by the terminal according to the first beam training signal, wherein the first beam training signal is a training signal corresponding to a downlink transmission beam in a first downlink transmission beam set;

sending configuration information of a second beam training signal to a terminal, where the configuration information is used to indicate information related to the second beam training signal and a training signal of a downlink transmission beam of a base station, and the downlink transmission beam of the base station belongs to the first downlink transmission beam set;

and transmitting a second beam training signal to the terminal.

Wherein the step of transmitting the first beam training signal to the terminal comprises:

determining a first downlink transmission beam set, wherein the first downlink transmission beam set comprises a plurality of downlink transmission beams, and each downlink transmission beam corresponds to a group of beam forming weights;

and after shaping the downlink transmission beam in the first downlink transmission beam set according to the corresponding beam shaping value, obtaining the first beam training signal and sending the first beam training signal to the terminal.

Wherein the step of transmitting the second beam training signal to the terminal comprises:

selecting a downlink transmission beam from the first downlink transmission beam set as a downlink transmission beam of the base station;

constructing a second downlink transmission beam set related to the downlink transmission beam of the base station;

and after shaping the downlink transmission beam in the second downlink transmission beam set according to a preset beam shaping value, obtaining a second beam training signal and sending the second beam training signal to the terminal.

The step of selecting a downlink transmission beam from the first downlink transmission beam set as the downlink transmission beam of the base station includes:

and selecting a downlink transmission beam from the first downlink transmission beam set as the downlink transmission beam of the base station according to the first recommended beam information.

The spatial correlation between the downlink transmission beam in the second downlink transmission beam set and the downlink transmission beam of the base station is higher than a second preset threshold, or the angle difference between the spatial orientation of the downlink transmission beam in the second downlink transmission beam set and the spatial orientation of the downlink transmission beam of the base station is within a second preset range.

In order to solve the above technical problem, an embodiment of the present invention further provides a base station, including:

the first transceiver module is configured to send a first beam training signal to a 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 a training signal corresponding to a downlink transmission beam in a first downlink transmission beam set;

a second transceiver module, configured to send configuration information of a second beam training signal to a terminal, where the configuration information is used to indicate information related to the second beam training signal and a training signal of a downlink transmission beam of a base station, and the downlink transmission beam of the base station belongs to the first downlink transmission beam set;

and the third transceiver module is used for transmitting a second beam training signal to the terminal.

Wherein the first transceiver module comprises:

a fourth determining submodule, configured to determine a first downlink transmission beam set, where the first downlink transmission beam set includes multiple downlink transmission beams, and each downlink transmission beam corresponds to one group of beamforming weights;

and the first sending submodule is used for shaping the downlink sending beam in the first downlink sending beam set according to the corresponding beam shaping value to obtain the first beam training signal and sending the first beam training signal to the terminal.

Wherein the third transceiver module comprises:

the selecting submodule is used for selecting a downlink transmitting wave beam from the first downlink transmitting wave beam set as a downlink transmitting wave beam of the base station;

a construction submodule, configured to construct a second downlink transmission beam set related to the downlink transmission beam of the base station;

and the second sending submodule is used for shaping the downlink sending beam in the second downlink sending beam set according to a preset beam shaping value to obtain a second beam training signal and sending the second beam training signal to the terminal.

The selecting submodule is configured to select a downlink transmission beam from the first downlink transmission beam set as the downlink transmission beam of the base station according to the first recommended beam information.

The embodiment of the invention has the following beneficial effects:

according to the technical scheme of the embodiment of the invention, the downlink receiving beam corresponding to the downlink transmitting beam in the first downlink transmitting beam set is determined according to the first beam training signal transmitted by the base station; determining a downlink receiving beam of a second beam training signal according to the corresponding relation between the downlink transmitting beam and the downlink receiving beam and the configuration information of the second beam training signal transmitted by the base station, wherein the configuration information is used for indicating the second beam training signal and the relevant information of the training signal of the downlink transmitting beam of the base station, and the downlink transmitting beam of the base station belongs to the first downlink transmitting beam set; and receiving the second beam training signal by utilizing the downlink receiving beam of the second beam training signal, and determining the optimal downlink receiving beam or the optimal downlink transmitting beam. In the embodiment of the invention, 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 each downlink receiving beam to receive the second beam training signal, so that the process of searching the receiving beam by the terminal is accelerated, and the time and the complexity required by beam training are reduced.

Drawings

Fig. 1 is a schematic diagram of weighting shaping of an intermediate frequency signal in conventional analog beamforming;

fig. 2 is a schematic diagram of weighting and forming a radio frequency signal in conventional analog beamforming;

fig. 3 is a schematic diagram of conventional digital-analog hybrid beamforming;

fig. 4 is a first flowchart of a beam training method according to an embodiment of the present invention;

fig. 5 is a second flowchart of the beam training method according to the embodiment of the present invention;

fig. 6 is a flowchart illustrating interaction between a base station and a terminal according to an embodiment of the present invention;

fig. 7 is a first structural block diagram of a terminal according to an embodiment of the present invention;

fig. 8 is a third flowchart of the beam training method according to the embodiment of the present invention;

fig. 9 is a first block diagram of a base station according to an embodiment of the present invention;

fig. 10 is a second block diagram of a base station according to an embodiment of the present invention;

fig. 11 is a second structural block diagram of the terminal according to the embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings.

The embodiment of the invention provides a beam training method, a terminal and a base station, and solves the problems that in the existing beam training method, the terminal needs to search corresponding receiving beams again for each level of beam training signals sent by the base station, and the beam training time and complexity are greatly increased.

First embodiment

As shown in fig. 4, the beam training method according to the embodiment of the present invention is applied to a terminal, and includes:

step 401: and determining a downlink receiving beam corresponding to the downlink transmitting beam in the first downlink transmitting beam set according to the first beam training signal transmitted by the base station.

The first beam training signal may include a training signal corresponding to each beam in the first downlink transmission beam set, for example, the first downlink transmission beam set includes N₁A base station can transmit N₁A training signal, N₁The training signals may be multiplexed by TDM, FDM, CDM, or a combination of multiplexing schemes.

And the terminal determines downlink receiving beams corresponding to part or all downlink transmitting beams in the first downlink transmitting beam set according to the first beam training signal transmitted by the base station.

Specifically, the terminal receives the first beam training signal, measures the first beam training signal, selects a recommended downlink transmission beam (first recommended beam), and determines a corresponding downlink reception beam for each first recommended beam, or determines one corresponding downlink reception beam for each downlink transmission beam in the first downlink transmission beam set, and stores a correspondence relationship between each downlink transmission beam in the first downlink transmission beam set and the downlink reception beam.

The terminal may respectively attempt to receive the training signal of the downlink transmission beam by using each candidate reception beam, and select the reception beam with the strongest reception signal power as the reception beam of the downlink transmission beam.

Step 402: and determining a downlink receiving beam of a second beam training signal according to the corresponding relation between the downlink transmitting beam and the downlink receiving beam and configuration information of the second beam training signal transmitted by the base station, wherein the configuration information is used for indicating the second beam training signal and relevant information of the training signal of the downlink transmitting beam of the base station, and the downlink transmitting beam of the base station belongs to the first downlink transmitting beam set.

In an embodiment of the invention, the second beam training signal includes a training signal corresponding to each beam in the second downlink transmission beam set. The second downlink transmission beam set is formed by that the base station selects one downlink transmission beam from the first downlink transmission beam set as a base station downlink transmission beam; constructing a second downlink transmission beam set related to the downlink transmission beam of the base station; and after shaping the downlink transmission beam in the second downlink transmission beam set according to a preset beam shaping value, obtaining a second beam training signal and sending the second beam training signal to the terminal.

Further, the configuration information may specifically be QCL information used for indicating the second beam training signal and a training signal of a downlink transmission beam of the base station. According to the embodiment of the invention, the process of searching the receiving beam by the terminal is accelerated and the complexity is reduced according to the QCL information among the plurality of beam training signals indicated by the base station.

Step 403: and receiving the second beam training signal by using the downlink receiving beam of the second beam training signal, and determining an optimal downlink transmitting beam or an optimal downlink receiving beam.

Specifically, the downlink receiving beam with the strongest received signal power may be selected as the optimal downlink receiving beam from the downlink receiving beam of the second beam training signal; and selecting the downlink receiving beam with the strongest received signal power as the optimal downlink transmitting beam from the downlink transmitting beams of the second beam training signals.

According to the beam training method provided by the embodiment of the invention, a downlink receiving beam corresponding to a downlink transmitting beam in a first downlink transmitting beam set is determined according to a first beam training signal transmitted by a base station; determining a downlink receiving beam of a second beam training signal according to the corresponding relation between the downlink transmitting beam and the downlink receiving beam and the configuration information of the second beam training signal transmitted by the base station, wherein the configuration information is used for indicating the second beam training signal and the relevant information of the training signal of the downlink transmitting beam of the base station, and the downlink transmitting beam of the base station belongs to the first downlink transmitting beam set; and receiving the second beam training signal by utilizing the downlink receiving beam of the second beam training signal, and determining the optimal downlink receiving beam or the optimal downlink transmitting beam. In the embodiment of the invention, 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 each downlink receiving beam to receive the second beam training signal, so that the process of searching the receiving beam by the terminal is accelerated, and the time and the complexity required by beam training are reduced.

Second embodiment

As shown in fig. 5, the beam training method according to the embodiment of the present invention is applied to a terminal, and includes:

step 501: and determining a downlink receiving beam corresponding to the downlink transmitting beam in the first downlink transmitting beam set according to the first beam training signal transmitted by the base station.

This step is the same as step 401 described above and is not described here.

Step 502: and determining a downlink transmission beam of the base station related to a second beam training signal according to the configuration information of the second beam training signal transmitted by the base station.

Specifically, the training signal of the downlink transmission beam of the base station related to the second beam training signal is determined according to the 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.

As can be seen from the above, the configuration information is used to indicate information related to the second beam training signal and the training signal of the downlink transmission beam of the base station in the first downlink transmission beam set, for example, QCL information of the second beam training signal and the training signal of the downlink transmission beam of the base station in the first 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 transmitted by the base station.

Step 503: and determining a first downlink receiving beam corresponding to the downlink transmitting beam of the base station according to the corresponding relation between the downlink transmitting beam and the downlink receiving beam.

Step 504: and determining a downlink receiving beam of the second beam training signal according to the first downlink receiving beam.

Specifically, the first downlink receiving beam is used as the downlink receiving beam of the second beam training signal; or constructing a downlink receiving beam set related to the first downlink receiving beam, and using the downlink receiving beam set as a downlink receiving beam of the second beam training signal.

The spatial correlation between the downlink receiving beam in the downlink receiving beam set and the first downlink receiving beam is greater than a first preset threshold or the angle difference between the spatial orientation of the downlink receiving beam in the downlink receiving beam set and the first downlink receiving beam is within a first preset range.

Step 505: and receiving the second beam training signal by using the downlink receiving beam of the second beam training signal, and determining an optimal downlink transmitting beam or an optimal downlink receiving beam.

This step is the same as step 403, and will not be described herein again.

According to the method for beam training provided by the embodiment of the invention, the first downlink receiving beam or the downlink receiving beam set related to the first downlink receiving beam is used as the downlink receiving beam of the second beam training signal according to the configuration information sent by the base station, so that the process of searching the receiving beam by the terminal is accelerated on the premise of ensuring the training precision, and the beam training duration and the training complexity are reduced.

Third embodiment

The following describes the operation flow of the base station and the terminal in the embodiment of the present invention with reference to fig. 6.

As shown in fig. 6, the above workflow includes:

step 601: the base station determines a first set of downlink transmit beams.

The base station determines a first downlink transmission beam set (called a first set for short), and the first set is assumed to have N in total₁Each downlink beam corresponds to a group of beam forming weights,the transmit beam forming weight of the nth beam is

Where K is the number of antenna elements for beam forming, which may be less than the number of antenna elements for the base station. And all beams in the first set of downlink transmit beams may cover the area covered by the base station.

Step 602: the base station transmits a first beam training signal.

The base station may transmit a beam training signal for each downlink transmit beam in the first set. For N₁A base station can transmit N₁A training signal. The N is₁The training signals may be multiplexed by TDM, FDM, CDM, or a combination of multiplexing schemes. For example, in an OFDM-based system, N₁Each training signal may occupy N₁Each training signal occupies 1 OFDM symbol, and TDM multiplexing is performed between the training signals. Training signals of multiple beams can also be transmitted in one OFDM symbol, and FDM multiplexing or CDM multiplexing is adopted among the training signals.

Assuming that a signal to be transmitted on one resource unit is s, a signal after being shaped by an nth beam is:

y＝[y₁y₂… y_K]^T＝W_ns

wherein, y_kWill be mapped to antenna element k for transmission.

The first beam training signal may be transmitted periodically or aperiodically.

Step 603: the terminal measures the first beam training signal, selects a first recommended beam, reports the first recommended beam related information to the base station, and determines a downlink receiving beam corresponding to a downlink transmitting beam in the first downlink transmitting beam set.

The terminal receives a first training signal transmitted by the base station, and selects a recommended downlink transmission beam (first recommended beam) by measuring the first training signal. For example, the terminal may select the beam with the strongest training signal received power as the recommended beam. The first recommended beam may be one beam or a plurality of beams.

The terminal receives the first beam training signals, measures the first beam training signals, selects recommended downlink transmission beams (first recommended beams), determines corresponding downlink receiving beams for each first recommended beam, or determines one corresponding downlink receiving beam for each downlink transmission beam in the first downlink transmission beam set, and stores the corresponding relation between each downlink transmission beam in the first downlink transmission beam set and the downlink receiving beams. The receive beam for the terminal may be selected from among the candidate receive beams. Terminal sharing

Each receiving beam corresponds to a group of beam forming weight values, and the receiving beam forming weight value of the nth beam is

Where L is the number of antenna elements for beam forming, which may be smaller than the number of antenna elements for the terminal. For a downlink beam training signal (or other signals), the terminal may attempt to receive it using each receive beam separately, and select the receive beam with the strongest received signal power as the receive beam of the downlink transmit beam.

And the terminal reports the relevant information of the first recommended beam to the base station, wherein the relevant information comprises the identifier of the first recommended beam, such as the number of the downlink transmission beam. According to different multiplexing modes of the downlink beam/beam training signals, information of the recommended downlink transmission beam fed back by the terminal can be different. For example, the downlink beamforming signal is time-division multiplexed at different OFDM symbols symbol or frame subframe, and the terminal measures and feeds back the selected downlink time information (OFDM symbol or subframe index). For another example, the downlink beamforming signal is multiplexed in different frequency resources (resource blocks PRB, subbands), and the terminal measures and feeds back selected downlink frequency information (PRB or subband index). The related information may further include strength information of the downlink transmission beam training signal received by the terminal, such as a received signal power level.

And the terminal stores the downlink receiving beam corresponding to the first recommended beam. The terminal needs to store the corresponding relationship between the first recommended beam and the downlink receiving beam. Optionally, the terminal stores all downlink receiving beams corresponding to the beams in the first set, and stores the corresponding relationship. Here, the downlink receive beam may refer to its number in all candidate downlink receive beams, or may refer to a weight of downlink receive beam forming itself.

Step 604: the base station determines a second downlink transmission beam set.

The base station selects a downlink transmission beam (base station downlink transmission beam) from the first set, and then determines a second downlink transmission beam set (for short, a second set) based on the base station downlink transmission beam. The first base station transmission beam may be determined based on the first recommended beam-related information reported by the terminal, for example, the beam with the highest strength is selected. The base station may not select the downlink transmission beam of the base station based on the first recommended beam information reported by the terminal.

Preferably, the spatial correlation between the downlink transmission beam in the second set and the downlink transmission beam of the base station is higher than a certain value, or the angular difference of the spatial pointing is within a certain range.

Assume that there is a total of N in the second set₂And a downlink transmission beam. As a specific example, there are 1 downlink transmission beam in the second set, and the downlink beam may be a base station downlink transmission beam.

Step 605: the base station transmits configuration information of the second beam training signal.

The configuration information includes time-frequency position information of the second beam training signal, and the like. The configuration information further includes indication information of a downlink transmission beam of the base station, and the indication information 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 Quasi co-sited (Quasi-co-located QCL) with respect to one or more spatial angle parameters (spatial angle of arrival mean, or spatial angle of arrival extension, or spatial angle of departure mean, or spatial angle of departure extension). If both signals are QCL for one spatial angle parameter, the spatial angle parameter of the other signal can be deduced from the spatial angle parameter of one signal.

The second training signal may be transmitted periodically or aperiodically. The second training signal may be a training signal of a transmission beam or a training signal of a reception beam (only one downlink transmission beam in the second set).

Step 606: the base station transmits a second beam training signal.

Step 607: and the terminal determines the training signal of the downlink transmission beam of the base station of the second beam training signal QCL according to the configuration information of the second beam training signal.

Step 608: and the terminal determines a first downlink receiving beam corresponding to the downlink transmitting beam of the base station according to the downlink receiving beam corresponding to the downlink transmitting beam in the first downlink transmitting beam set.

Step 609: and the terminal determines the downlink receiving beam of the second beam training signal according to the first downlink receiving beam, receives the second beam training signal by using the downlink receiving beam of the second beam training signal, and determines the optimal downlink receiving beam or the optimal downlink transmitting beam.

The terminal may receive the second beam training signal using a first downlink receive beam (which is stored by the terminal) corresponding to the terminal downlink transmit beam.

Or the terminal constructs a downlink receiving beam set (third set for short) based on the first downlink receiving beam corresponding to the terminal downlink transmitting beam. The terminal selects the best receive beam in the third set based on the second beam training signal. The terminal may respectively attempt to receive the second training signal using each receive beam in the third set, select the receive beam with the strongest receive signal power as the optimal receive beam, and select the downlink receive beam with the strongest receive signal power as the optimal downlink transmit beam among the downlink transmit beams of the second beam training signals.

Preferably, the spatial correlation between the downlink receiving beam in the third set and the first downlink receiving beam is higher than a certain value, or the angular difference of the spatial pointing direction is within a certain range.

The relationship between the first set and the second set is described in detail below.

If the antenna array of the base station is a linear array, the weights of the transmit beams may consist of oversampled DFT vectors. For a linear array, assume the number of antenna elements is N₁Over-sampling rate of O₁Then the oversampled DFT vector has O₁N₁The method specifically comprises the following steps:

n may be included in the first set₁The beam forming weight of each beam is as follows:

then the beam in the first set

The beamforming weights for the beams in the associated second set may include:

has a total of O₁And (4) respectively.

For a planar array, the weights of the transmit beams may consist of oversampled 2D DFT vectors. The number of antenna oscillators in the first dimension and the second dimension are respectively assumed to be N₁And N₂And the oversampling rate factors of the two dimensions are O₁And O₂Then the oversampled DFT vector has O₁O₂N₁N₂The method comprises the following steps:

n may be included in the first set₁N₂The beam forming weight of each beam is as follows:

{z_k,l|k＝0,O₁,2O₁,...,(N₁-1)O₁；l＝0,O₂,2O₂,...,(N₂-1)O₂}

with the beams in the first set

(n₁＝0,1,...,N₁-1；n₂＝0,1,2,...,N₂-1) the beamforming weights of the beams in the associated second set may comprise:

{z_k,l|k＝n₁O₁,n₁O₁+1,...,(n₁+1)O₁-1；l＝n₂O₂,n₂O₂+1,...,(n₂+1)O₂-1}

has a total of O₁O₂And (4) respectively.

According to the beam training method provided by the embodiment of the invention, the first downlink receiving beam or the downlink receiving beam set related to the first downlink receiving beam is used as the downlink receiving beam of the second beam training signal according to the configuration information sent by the base station, so that the process of searching the receiving beam by the terminal is accelerated on the premise of ensuring the training precision, and the beam training duration and the training complexity are reduced. In addition, the invention adopts two-stage beam training to obtain better balance among training, spending and precision.

Fourth embodiment

As shown in fig. 7, an embodiment of the present invention further provides a terminal, including:

a first determining module 71, configured to determine, according to a first beam training signal sent by a base station, a downlink receiving beam corresponding to a downlink sending beam in a first downlink sending beam set;

a second determining module 72, configured to determine a downlink receiving beam of a second beam training signal according to a corresponding relationship between the downlink transmitting beam and the downlink receiving beam and configuration information of the second beam training signal sent by the base station, where the configuration information is used to indicate information related to the second beam training signal and a training signal of a downlink transmitting beam of the base station, and the downlink transmitting beam of the base station belongs to the first downlink transmitting beam set;

a third determining module 73, configured to receive the second beam training signal by using a downlink receive beam of the second beam training signal, and determine an optimal downlink transmit beam or an optimal downlink receive beam.

In the terminal according to the embodiment of the present invention, the second determining module 72 includes:

a first determining submodule 721, configured to determine, according to configuration information of a second beam training signal sent by a base station, a downlink base station transmission beam related to the second beam training signal;

the second determining submodule 722 is configured to determine, according to the correspondence between the downlink transmission beam and the downlink reception beam, a first downlink reception beam corresponding to the base station downlink transmission beam;

the third determining sub-module 723 is configured to determine a downlink receive beam of the second beam training signal according to the first downlink receive beam.

In the terminal of the embodiment of the present invention, the third determining sub-module 723 is configured to use the first downlink receive beam as a downlink receive beam of the second beam training signal; or

In the terminal of the embodiment of the present invention, a spatial correlation between a downlink receive beam in the downlink receive beam set and the first downlink receive beam is greater than a first preset threshold, or an angle difference between spatial pointing directions of the downlink receive beam in the downlink receive beam set and the first downlink receive beam is within a first preset range.

In the terminal of the embodiment of the present invention, the configuration information is used to indicate the second beam training signal and the QCL information of the training signal of the downlink transmission beam of the base station.

In the terminal according to the embodiment of the present invention, the third determining module 73 is configured to select, as the optimal downlink receive beam, the downlink receive beam with the strongest received signal power among the downlink receive beams of the second beam training signals.

In the terminal according to the embodiment of the present invention, the third determining module 73 is configured to select, as the optimal downlink transmit beam, the downlink receive beam with the strongest received signal power among the downlink transmit beams of the second beam training signals.

According to the terminal of the embodiment of the invention, a downlink receiving beam corresponding to a downlink transmitting beam in a first downlink transmitting beam set is determined according to a first beam training signal transmitted by a base station; determining a downlink receiving beam of a second beam training signal according to the corresponding relation between the downlink transmitting beam and the downlink receiving beam and the configuration information of the second beam training signal transmitted by the base station, wherein the configuration information is used for indicating the second beam training signal and the relevant information of the training signal of the downlink transmitting beam of the base station, and the downlink transmitting beam of the base station belongs to the first downlink transmitting beam set; and receiving the second beam training signal by utilizing the downlink receiving beam of the second beam training signal, and determining the optimal downlink receiving beam or the optimal downlink transmitting beam. In the embodiment of the invention, 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 each downlink receiving beam to receive the second beam training signal, so that the process of searching the receiving beam by the terminal is accelerated, and the time and the complexity required by beam training are reduced.

Fifth embodiment

As shown in fig. 8, an embodiment of the present invention further provides a beam training method applied to a base station, including:

step 801: the method comprises the steps of sending a first beam training signal to a terminal, and receiving first recommended beam information sent by the terminal according to the first beam training signal, wherein the first beam training signal is a training signal corresponding to a downlink transmission beam in a first downlink transmission beam set.

Here, the terminal receives a first beam training signal sent by the base station, measures the first beam training signal, selects a first recommended beam, and reports information related to the first recommended beam to the base station. The first recommended beam may be one beam or a plurality of beams.

The first recommended beam information may include an identifier of the first recommended beam, for example, a number of the downlink transmission beam. According to different multiplexing modes of the downlink beam/beam training signals, information of the recommended downlink transmission beam fed back by the terminal can be different. For example, the downlink beamforming signal is time-division multiplexed at different OFDM symbols symbol or frame subframe, and the terminal measures and feeds back the selected downlink time information (OFDM symbol or subframe index). For another example, the downlink beamforming signal is multiplexed in different frequency resources (resource blocks PRB, subbands), and the terminal measures and feeds back selected downlink frequency information (PRB or subband index). The related information may further include strength information of the downlink transmission beam training signal received by the terminal, such as a received signal power level.

Step 802: and sending configuration information of a second beam training signal to a terminal, wherein the configuration information is used for indicating the second beam training signal and information related to a training signal of a downlink transmission beam of a base station, and the downlink transmission beam of the base station belongs to the first downlink transmission beam set.

Step 803: and transmitting a second beam training signal to the terminal.

Here, the base station transmits configuration information of a second beam training signal to the terminal, so that the terminal determines a downlink receiving beam of the second beam training signal according to the correspondence and the configuration information of the second beam training signal transmitted by the base station, receives the second beam training signal by using the downlink receiving beam of the second beam training signal, and determines an optimal downlink receiving beam or an optimal downlink transmitting beam.

Specifically, the configuration information is used to indicate the quasi co-site QCL information of the second beam training signal and the training signal of 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 Quasi co-located QCL (Quasi-co-located QCL) for one or more spatial angle parameters (spatial angle of arrival mean, or spatial angle of arrival extension, or spatial angle of departure mean, or spatial angle of departure extension). If both signals are QCL for one spatial angle parameter, the spatial angle parameter of the other signal can be deduced from the spatial angle parameter of one signal.

Further, the step of transmitting the first beam training signal to the terminal in step 801 includes:

Further, the step of transmitting the second beam training signal to the terminal in step 802 includes:

constructing a second downlink transmission beam set related to the downlink transmission beam of the base station; and after shaping the downlink transmission beam in the second downlink transmission beam set according to a preset beam shaping value, obtaining a second beam training signal and sending the second beam training signal to the terminal.

And sent to the terminal.

Preferably, according to the first recommended beam information, a downlink transmission beam is selected from the first downlink transmission beam set as the base station downlink transmission beam. For example, the beam with the highest intensity is selected.

Preferably, the spatial correlation between the downlink transmission beam in the second downlink transmission beam set and the downlink transmission beam of the base station is higher than a second preset threshold, or an angle difference between the spatial pointing directions of the downlink transmission beam in the second downlink transmission beam set and the downlink transmission beam of the base station is within a second preset range.

According to the beam training method provided by the embodiment of the invention, 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 does not need to use each downlink receiving beam to receive the second beam training signal, the process of searching the receiving beam by the terminal is accelerated, and the time and the complexity required by beam training are reduced.

Sixth embodiment

As shown in fig. 9, an embodiment of the present invention further provides a base station, including:

the first transceiver module 91 is configured to send a first beam training signal to a 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 a training signal corresponding to a downlink transmission beam in a first downlink transmission beam set;

a second transceiver module 92, configured to send configuration information of a second beam training signal to a terminal, where the configuration information is used to indicate information related to the second beam training signal and a training signal of a downlink transmission beam of a base station, where the downlink transmission beam of the base station belongs to the first downlink transmission beam set;

a third transceiver module 93, configured to send a second beam training signal to the terminal.

In the base station of the embodiment of the present invention, the first transceiver module 91 includes:

a fourth determining submodule 911, configured to determine a first downlink transmission beam set, where the first downlink transmission beam set includes multiple downlink transmission beams, and each downlink transmission beam corresponds to a group of beamforming weights;

a first sending submodule 912, configured to shape a downlink sending beam in the first downlink sending beam set according to a corresponding beam shaping value, obtain the first beam training signal, and send the first beam training signal to a terminal.

In the base station of the embodiment of the present invention, the third transceiver module 93 includes:

the selecting submodule 931 is configured to select a downlink transmission beam from the first downlink transmission beam set as a downlink transmission beam of the base station;

a constructing submodule 932, configured to construct a second set of downlink transmission beams related to the base station downlink transmission beam;

the second sending submodule 933 is configured to shape the downlink sending beam in the second downlink sending beam set according to a preset beam shaping value, obtain the second beam training signal, and send the second beam training signal to the terminal.

In the base station of the embodiment of the present invention, the selecting sub-module 931 is configured to select a downlink transmission beam from the first downlink transmission beam set as the downlink transmission beam of the base station according to the first recommended beam information.

In the base station of the embodiment of the present invention, a spatial correlation between a downlink transmission beam in the second downlink transmission beam set and a downlink transmission beam of the base station is higher than a second preset threshold, or an angle difference between spatial pointing directions of the downlink transmission beam in the second downlink transmission beam set and the downlink transmission beam of the base station is within a second preset range.

In the base station of the embodiment of the present invention, the configuration information is used to indicate the quasi-common-site QCL information of the second beam training signal and the training signal of the downlink transmission beam of the base station.

The base station of the embodiment of the invention 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, and the terminal does not need to use each downlink receiving beam to receive the second beam training signal, thereby accelerating the process of searching the receiving beam by the terminal, and reducing the time and the complexity required by beam training.

Seventh embodiment

In order to better achieve the above object, as shown in fig. 10, a seventh embodiment of the present invention further provides a base station, including: a processor 1000; a memory 1020 coupled to the processor 1000 via a bus interface, and a transceiver 1010 coupled to the processor 1000 via a bus interface; the memory 1020 is used for storing programs and data used by the processor in performing operations; transmitting data information or pilot frequency through the transceiver 1010, and receiving an uplink control channel through the transceiver 1010; when the processor 1000 calls and executes the programs and data stored in the memory 1020, the following functional modules are implemented:

The processor 1000 is used for reading the program in the memory 1020 and executing the following processes: sending a first beam training signal to a terminal through a transceiver 1010, and receiving first recommended beam information sent by the terminal according to the first beam training signal, where the first beam training signal is a training signal corresponding to a downlink transmission beam in a first downlink transmission beam set; transmitting configuration information of a second beam training signal to a terminal through a transceiver 1010, where the configuration information is used to indicate information related to the second beam training signal and a training signal of a downlink transmission beam of a base station, where the downlink transmission beam of the base station belongs to the first downlink transmission beam set; and transmitting a second beam training signal to the terminal.

A transceiver 1010 for receiving and transmitting data under the control of the processor 1000.

Where in fig. 10, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 1000 and memory represented by memory 1020. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1010 may be a number of elements including a transmitter and a transceiver providing a means for communicating with various other apparatus over a transmission medium. The processor 1000 is responsible for managing the bus architecture and general processing, and the memory 1020 may store data used by the processor 1000 in performing operations.

In the base station of the embodiment of the present invention, the processor 1000 is configured to send a first beam training signal to the terminal through the transceiver 1010, and receive first recommended beam information sent by the terminal according to the first beam training signal; and sending 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, and the terminal does not need to use each downlink receiving beam to receive the second beam training signal, thereby accelerating the process of searching the receiving beam by the terminal, and reducing the time and complexity required by beam training.

Eighth embodiment

In order to better achieve the above object, as shown in fig. 11, an eighth embodiment of the present invention further provides a terminal, including: a processor 1100; a memory 1120 connected to the processor 1100 through a bus interface, and a transceiver 1110 connected to the processor 1100 through a bus interface; the memory is used for storing programs and data used by the processor in executing operations; receiving, by the transceiver 1110, a downlink control channel; when the processor 1100 calls and executes the programs and data stored in the memory 1120, the following functional blocks are implemented:

The processor 1100 is used for reading the program in the memory 1120 and executing the following processes: determining a downlink receiving beam corresponding to a downlink transmitting beam in a first downlink transmitting beam set according to a first beam training signal transmitted by a base station; determining a downlink receiving beam of a second beam training signal according to the corresponding relation between the downlink transmitting beam and the downlink receiving beam and configuration information of the second beam training signal transmitted by the base station, wherein the configuration information is used for indicating the second beam training signal and relevant information of the training signal of the downlink transmitting beam of the base station, and the downlink transmitting beam of the base station belongs to the first downlink transmitting beam set; receiving, by the transceiver 1110, the second beam training signal with the downlink receive beam of the second beam training signal, and determining an optimal downlink transmit beam or an optimal downlink receive beam.

A transceiver 1110 for receiving and transmitting data under the control of the processor 1100.

Where in fig. 11, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1100, and various circuits, represented by memory 1120, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1110 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. For different user devices, the user interface 1130 may also be an interface capable of interfacing with a desired device, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1100 is responsible for managing the bus architecture and general processing, and the memory 1120 may store data used by the processor 1100 in performing operations.

In the terminal of the embodiment of the present invention, the processor 1100 is configured to determine, according to a first beam training signal sent by a base station, a downlink receive beam corresponding to a downlink transmit beam in a first downlink transmit beam set; determining a downlink receiving beam of a second beam training signal according to the corresponding relation between the downlink transmitting beam and the downlink receiving beam and the configuration information of the second beam training signal transmitted by the base station, wherein the configuration information is used for indicating the second beam training signal and the relevant information of the training signal of the downlink transmitting beam of the base station, and the downlink transmitting beam of the base station belongs to the first downlink transmitting beam set; and receiving the second beam training signal by utilizing the downlink receiving beam of the second beam training signal, and determining the optimal downlink receiving beam or the optimal downlink transmitting beam. In the embodiment of the invention, 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 each downlink receiving beam to receive the second beam training signal, so that the process of searching the receiving beam by the terminal is accelerated, and the time and the complexity required by beam training are reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A beam training method is applied to a terminal, and is characterized by comprising the following steps:

2. The beam training method according to claim 1, wherein the step of determining the downlink receiving beam of the second beam training signal according to the corresponding relationship between the downlink transmitting beam and the downlink receiving beam and the configuration information of the second beam training signal transmitted by the base station comprises:

3. The beam training method according to claim 2, wherein the step of determining the downlink receive beam of the second beam training signal according to the first downlink receive beam comprises:

4. The beam training method according to claim 3, wherein a spatial correlation between the downlink receive beam in the downlink receive beam set and the first downlink receive beam is greater than a first preset threshold or an angular difference between spatial orientations of the downlink receive beam in the downlink receive beam set and the first downlink receive beam is within a first preset range.

5. The beam training method of claim 1, wherein the configuration information is used to indicate quasi co-site (QCL) information of the second beam training signal and the training signal of the downlink transmission beam of the base station.

6. The beam training method of claim 1, wherein the step of receiving the second beam training signal using a downlink receive beam of the second beam training signal and determining the best downlink receive beam comprises:

7. The beam training method of claim 1, wherein the step of receiving the second beam training signal using a downlink receive beam of the second beam training signal and determining an optimal downlink transmit beam comprises:

8. A terminal, comprising:

9. The terminal of claim 8, wherein the second determining module comprises:

10. The terminal of claim 9, wherein the third determining sub-module is configured to use the first downlink receiving beam as the downlink receiving beam of the second beam training signal; or

11. The terminal according to claim 10, wherein a spatial correlation between the downlink receive beam in the downlink receive beam set and the first downlink receive beam is greater than a first preset threshold or an angular difference between a spatial orientation of the downlink receive beam in the downlink receive beam set and the first downlink receive beam is within a first preset range.

12. The terminal of claim 8, wherein the configuration information is used to indicate quasi co-site location (QCL) information of the second beam training signal and the training signal of the downlink transmission beam of the base station.

13. The terminal of claim 8, wherein the third determining module is configured to select a downlink receiving beam with the strongest received signal power as the best downlink receiving beam among the downlink receiving beams of the second beam training signal.

14. The terminal of claim 8, wherein the third determining module is configured to select a downlink receiving beam with the strongest received signal power as the best downlink transmitting beam among the downlink transmitting beams of the second beam training signals.

15. A beam training method applied to a base station is characterized by comprising the following steps:

and transmitting a second beam training signal to the terminal.

16. The beam training method of claim 15, wherein the step of transmitting the first beam training signal to the terminal comprises:

17. The beam training method of claim 15, wherein the step of transmitting the second beam training signal to the terminal comprises:

18. The beam training method of claim 17, wherein the step of selecting one downlink transmission beam from the first set of downlink transmission beams as the base station downlink transmission beam comprises:

19. The beam training method according to claim 17, wherein a spatial correlation between a downlink transmission beam in the second downlink transmission beam set and a downlink transmission beam of a base station is higher than a second preset threshold, or an angular difference between spatial orientations of the downlink transmission beam in the second downlink transmission beam set and the downlink transmission beam of the base station is within a second preset range.

20. The beam training method of claim 15, wherein the configuration information is used to indicate quasi co-site location (QCL) information of the second beam training signal and the training signal of the downlink transmission beam of the base station.

21. A base station, comprising:

22. The base station of claim 21, wherein the first transceiver module comprises:

23. The base station of claim 21, wherein the third transceiver module comprises:

24. The base station of claim 23, wherein the selecting sub-module is configured to select a downlink transmission beam from the first set of downlink transmission beams as the base station downlink transmission beam according to the first recommended beam information.

25. The base station of claim 23, wherein a spatial correlation between the downlink transmission beam in the second set of downlink transmission beams and the downlink transmission beam of the base station is higher than a second preset threshold, or an angular difference between spatial orientations of the downlink transmission beam in the second set of downlink transmission beams and the downlink transmission beam of the base station is within a second preset range.

26. The base station of claim 21, wherein the configuration information is used to indicate quasi co-site location (QCL) information of the second beam training signal and the training signal of the downlink transmission beam of the base station.