KR20180113138A - Method and apparatus for transmitting and receiving data based on multiple beam - Google Patents

Abstract

The present embodiments are relate to a method and apparatus for transmitting and receiving data based on a multiple beam in a wireless communication system using a beamforming system. A base station separates and manages an active beam set, a candidate beam set, and an idle beam set based on beam state information received from a terminal. Then, based on the active beam set, a beam to be used for data transmission is selected and beam indication information is transmitted to the terminal. So, the terminal can receive data using the beam. The terminal can use data reception directly without any procedure for setting a beam of a good state among recently reported beams as the active beam, by transmitting a predefined value as the beam direction information.

Description

[0001] METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA BASED ON MULTIPLE BEAM [0002]

The present embodiments are directed to a method and apparatus for transmitting and receiving data on a multi-beam basis in a beamforming system.

In a wireless communication system, a base station or a terminal can transmit and receive data and signals using a beamforming technique to improve transmission and reception performance of data and signals. In one example, the base station selects one of the beams and transmits data or signals using the selected beam. By informing the terminal about the beam used for transmitting the data or the signal, the terminal can receive the data or the signal through the corresponding beam.

Particularly, discussions are being made on the use of a very high frequency band which can use a wide bandwidth in a next generation wireless communication system. In the very high frequency band, since the path loss is larger than a conventional cellular frequency, a beam forming technique is necessary to secure coverage.

However, even in the case of transmitting and receiving data by using such a beam forming technique, there is a problem that a beam is blocked by an obstacle in a beam forming method using a single beam, and the communication state is cut off. Further, there is a problem that data transmission / reception is delayed due to the time required for the beam changing process even if the beam is blocked and changed to another beam having a good state.

It is an object of the present embodiments to provide a method and apparatus for transmitting and receiving data between a base station and a terminal using a plurality of beams.

It is an object of the present invention to provide a method and apparatus for efficiently managing a plurality of beams used for data transmission and reception in a multi-beam-based data transmission / reception system and easily informing beam information used for data transmission / reception.

It is an object of the present embodiments to provide a method and apparatus that can reduce the time delay due to a beam changing procedure in a system for transmitting and receiving data on a multi-beam basis.

In one aspect, the present embodiments provide a method for a terminal to receive data on a multi-beam basis, the method comprising: receiving a beam reference signal for one or more beams from a base station; Transmitting beam state information to a base station; receiving beam direction information from the base station and transmitting data using the beam selected based on the beam state information according to the beam direction information; The method comprising the steps of:

In another aspect, the present embodiments provide a method for a base station to transmit data on a multi-beam basis, the method comprising: transmitting a beam reference signal for one or more beams to a terminal; Setting a beam included in the active beam set and a beam included in the set of candidate beams based on the beam state information and transmitting the beam direction information to the terminal based on the beam state information, And then transmitting the data using the selected beam.

In another aspect, the present embodiments provide a terminal for receiving data on a multi-beam basis, comprising: a receiver for receiving a beam reference signal for one or more beams from a base station; And a control unit for generating beam status information and transmitting the beam status information to the base station, wherein the reception unit receives the beam indication information from the base station and transmits the data transmitted using the beam selected based on the beam status information according to the beam indication information To the terminal.

In another aspect, the present embodiments provide a base station for transmitting data on a multi-beam basis, the base station comprising: a transmitter for transmitting a beam reference signal for one or more beams to a terminal; And a control unit for receiving the beam status information and setting the beam included in the active beam set and the beam included in the beam set included in the candidate beam set based on the beam status information and transmitting the beam indication information to the terminal, And a base station for transmitting data using the beam selected according to the beam indication information.

According to the present embodiments, data can be transmitted and received on a multi-beam basis, thereby preventing a communication state from being broken due to a beam state or a surrounding environment.

According to the embodiments, a plurality of beams used for data transmission and reception are managed for each group according to a state, and the kind of beam belonging to each group is changed in real time, thereby enabling data transmission / reception using a beam having a good state.

According to the embodiments of the present invention, it is possible to transmit / receive data by using a changed beam without going through a beam setting procedure for changing the beam, thereby enabling immediate beam change according to the state of the beam.

Figure 1 is an illustration of an example of a wireless communication system for transmitting and receiving data on a single beam basis.
FIGS. 2 and 3 are diagrams showing an outline and a procedure of the beam forming technique.
4 is a diagram illustrating an example of a phenomenon in which a communication state is disconnected due to a surrounding situation in a wireless communication system that transmits and receives data based on a single beam.
5 and 6 are diagrams illustrating an example of a wireless communication system for transmitting and receiving data on a multi-beam basis.
7 is a diagram illustrating an example of a beam setting procedure of a wireless communication system that transmits and receives data on a multi-beam basis.
8 and 9 are views illustrating an example of a method of managing a plurality of beams in a wireless communication system that transmits and receives data on a multi-beam basis.
10 is a diagram illustrating an example of a method of changing a beam according to beam indication information in a wireless communication system that transmits and receives data on a multi-beam basis.
11 is a diagram illustrating another example of a method of changing a beam according to beam indication information in a wireless communication system that transmits and receives data on a multi-beam basis.
12 is a diagram illustrating a method of receiving data on a multi-beam basis by a terminal according to the present embodiments.
13 is a diagram illustrating a method of transmitting data on a multi-beam basis by a base station according to the present embodiments.
FIG. 14 is a diagram illustrating a configuration of a terminal according to the present embodiments.
15 is a diagram illustrating a configuration of a base station according to the present embodiments.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

As used herein, a wireless communication system refers to a system for providing various communication services such as voice, packet data, and the like. A wireless communication system includes a user equipment (UE) and a base station (BS).

The user terminal is a comprehensive concept that means a terminal in a wireless communication, and it is a comprehensive concept which means a mobile station (MS) in GSM, a mobile station (MS) in UT (User Terminal), a Subscriber Station (SS), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B, a gNode-B, a Low Power Node A sector, a site, various types of antennas, a base transceiver system (BTS), an access point, a point (for example, a transmission point, a reception point, a transmission / reception point) (RRH), a radio unit (RU), and a small cell, as well as a relay cell, a relay node, a megacell, a macrocell, a microcell, a picocell, a femtocell, an RRH,

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. Macro cell, micro cell, picocell, femtocell, small cell, or 2) the wireless region itself in connection with the wireless region. 1), all of the devices that interact to configure the wireless area to be cooperatively controlled by the same entity are all pointed to the base station. A point, a transmission / reception point, a transmission point, a reception point, and the like are examples of the base station according to the configuration method of the radio area. 2 may direct the base station to the wireless region itself to receive or transmit signals at the point of view of the user terminal or in the vicinity of the neighboring base station.

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or a transmission point or a transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

Herein, the user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word Do not.

Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

The time division duplex (TDD) scheme, which is transmitted using different time periods, can be used for the uplink and downlink transmission, and a frequency division duplex (FDD) scheme in which different frequencies are used, a TDD scheme and an FDD scheme A hybrid method can be used.

In the wireless communication system, the uplink and the downlink are configured with reference to one carrier or carrier pair to form a standard.

The uplink and the downlink transmit control information through a control channel such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), and the like. The physical downlink shared channel (PDSCH), the physical uplink shared channel (PUSCH) It is composed of the same data channel and transmits data.

A downlink may refer to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink may refer to a communication or communication path from a terminal to a multiple transmission / reception point. At this time, in the downlink, the transmitter may be a part of the multiple transmission / reception points, and the receiver may be a part of the terminal. Also, in the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH and PDSCH are transmitted and received'.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The base station performs downlink transmission to the UEs. The base station includes downlink control information, such as scheduling, required for reception of a downlink data channel, which is a primary physical channel for unicast transmission, and physical downlink control information for transmitting scheduling grant information for transmission in an uplink data channel. A control channel can be transmitted. Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

There are no restrictions on multiple access schemes applied in wireless communication systems. (TDMA), Frequency Division Multiple Access (FDMA), Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Non-Orthogonal Multiple Access (NOMA) Various multiple access schemes such as OFDM-CDMA can be used. Here, the NOMA includes Sparse Code Multiple Access (SCMA) and Low Density Spreading (LDS).

One embodiment of the present invention relates to asynchronous wireless communications that evolve into LTE / LTE-Advanced, IMT-2020 over GSM, WCDMA, HSPA, and synchronous wireless communications such as CDMA, CDMA- Can be applied.

In this specification, a MTC (Machine Type Communication) terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. Alternatively, the MTC terminal may refer to a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, the MTC terminal in this specification may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC-related operations. Alternatively, the MTC terminal may support enhanced coverage over the existing LTE coverage or a UE category / type defined in the existing 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost low complexity UE category / type. Or a further Enhanced MTC terminal defined in Release-14.

In this specification, NarrowBand Internet of Things (NB-IoT) terminal means a terminal supporting wireless access for cellular IoT. The objectives of NB-IoT technology include improved indoor coverage, support for large-scale low-rate terminals, low latency sensitivity, ultra-low cost, low power consumption, and optimized network architecture.

Enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliable and Low Latency Communication (URLLC) have been proposed as typical usage scenarios in NR (New Radio), which is under discussion in 3GPP.

In this specification, a frequency, a frame, a subframe, a resource, a resource block, a region, a band, a subband, a control channel, a data channel, a synchronization signal, various reference signals, various signals, May be interpreted as past or presently used meanings or various meanings used in the future.

Figure 1 shows an example of a wireless communication system for transmitting and receiving data on a single beam basis.

Referring to FIG. 1, a mobile station can transmit and receive data using a beamforming technique in transmitting and receiving data to / from a base station. For example, the base station selects one of the beams and transmits data to the terminal using the selected beam. Then, the terminal receives the information on the beam used for data transmission from the base station and receives the data using the corresponding beam.

In order to select a beam to be used for data transmission, the base station may transmit a beam reference signal for a plurality of beams to the terminal, and receive beam state information indicating the state of each beam from the terminal.

The base station selects a beam for data transmission based on the beam state information and informs the terminal of information about the beam. Then, data is transmitted to the terminal using the selected beam.

In applying the beamforming for data transmission, the base station can use a digital beamforming scheme for precoding data or an analog beamforming scheme for adjusting the direction of a signal transmitted from the antenna. Alternatively, a hybrid beam forming method in which a digital beam forming method and an analog beam forming method are combined may be used.

FIG. 2 and FIG. 3 illustrate an outline and a procedure of the beamforming technique, which is an example of the hybrid beamforming method.

Referring to FIG. 2, there is shown an example of a hybrid beamforming structure using both analog beamforming and digital beamforming.

The digital precoder precodes the data for beamforming and the precoded data is transmitted at the antenna with analog beamforming applied. When data with beamforming is transmitted through the corresponding channel, data is received using analog beamforming.

In the hybrid beamforming structure, in order to reduce the complexity, a signal is transmitted in a specific direction defined by a beam index (or a beam ID) through analog beamforming using a narrow beam.

That is, a beam index used for data transmission is notified to the terminal in advance, and data is transmitted in a specific direction according to the beam index so that the terminal can receive the beam index.

At this time, it is also possible to support diversity or spatial multiplexing transmission method through digital beamforming between analog antenna arrays.

FIG. 3 shows an example of a procedure for managing a beam and transmitting and receiving data by applying a beam forming technique.

For example, beam management and data transmission / reception can be performed in the following steps.

1. The base station sequentially fires the beams so that the terminals can receive the various beams.

2. The terminal reports the beam ID of the best signal to the base station.

3. Based on the reported beams, the base station informs the terminal of the beam to be transmitted.

4. The base station sends data from the best beam among the reported beams.

Specifically, referring to FIG. 3, the BS periodically transmits a beam reference signal for a plurality of beams to the MS (1). The terminal transmits a random access preamble to the base station (2), and receives a random access response from the base station (3).

The terminal measures the beam status using the beam reference signals for the various beams received from the base station and reports the beam with the best beam status to the base station (4). For example, beam 5 (BID = 5) can be reported as the best beam. That is, it requests data transmission with beam # 5 which is the best beam in the state.

The terminal and the base station perform a radio resource control connection (⑤), the base station changes the beam with the fifth beam and informs the terminal of the beam change information (⑥). Then, the base station transmits the data using the beam 5, which is reported as the best beam, and the terminal receives the data using the beam 5 (7).

By managing the beam to be used for data transmission according to this procedure, the data transmission / reception performance between the base station and the terminal can be improved.

However, in a wireless communication system that transmits and receives data based on a single beam, a beam may be blocked by an obstacle or the like, and a communication state may be interrupted.

4 shows an example of a situation where a beam is blocked by an obstacle in a wireless communication system that transmits and receives data on a single beam basis.

Referring to FIG. 4, a base station transmits data to a mobile station using a best beam.

However, as in the case shown in Fig. 4, the beam transmitted from the base station can be blocked by an obstacle such as an automobile. In this case, the communication state may be cut off.

Therefore, in a wireless communication system that transmits and receives data based on a single beam, even if data is transmitted / received using a good beam, the communication state may be interrupted depending on the surrounding situation, and a time delay may occur due to the beam change.

The wireless communication system according to the present embodiments provides a method capable of transmitting and receiving data on a multi-beam basis by providing a specific procedure of managing a plurality of beams and changing a beam.

5 and 6 illustrate an example of a wireless communication system for transmitting and receiving data on a multi-beam basis.

Referring to FIG. 5, a terminal may receive data from one or more base stations using one or more beams.

For example, the base station A, the base station B, and the base station C can receive data transmitted using three beams. Or, it may receive data transmitted from one of the base stations using a plurality of beams.

Therefore, even if a specific beam is blocked by an obstacle or the like, data is received through a plurality of beams, so that data can be received through another path, thereby preventing a communication state from being cut off.

In order to transmit and receive data based on the multi-beam, a base station manages a list of a plurality of beams used for data transmission, and transmits data to the terminal through the list.

The terminal sets a beam for data reception and receives data through a multi-beam setting process, and can combine multiple beam signals to maximize signal gain.

FIG. 6 shows an example of a process of changing a beam used for data transmission in a wireless communication system that transmits and receives data based on this multi-beam.

Referring to FIG. 6, a terminal receives data using a first beam B1 from a base station A and receives data from a base station B using a second beam B2.

As the terminal moves, the states of the first beam B1 and the second beam B2 may become poor, and the base station and the terminal may change the beam used for data transmission / reception and perform data transmission / reception.

6, when a terminal moves, the terminal receives data using the third beam B3 from the base station B and receives data using the fourth beam B4 from the base station C .

Since the terminal receives data using multiple beams from a plurality of base stations, it is possible to prevent the communication state from being disconnected due to a specific path being blocked by an obstacle or the like. Further, when the terminal moves, the communication performance between the terminal and the base station can be improved by changing the beam to a beam having a good state and transmitting / receiving data.

Accordingly, in a wireless communication system that transmits and receives data based on a multi-beam, a base station manages a beam used for data transmission and reception and needs to set a beam to the terminal.

The present invention provides a concrete method of managing multiple beams in a wireless communication system for transmitting and receiving data based on a multi-beam based on the present invention and transmitting information about a beam used for data transmission to the terminal.

FIG. 7 shows an example of a procedure for setting a beam used for data transmission / reception in a wireless communication system that transmits and receives data on a multi-beam basis.

Referring to FIG. 7, the BS also sequentially transmits beam reference signals for a plurality of beams (1). The terminal measures the state of a plurality of beams based on the beam reference signal received from the base station, generates beam state information, and reports the state information to the base station (2).

At this time, the terminal can transmit beam state information for a plurality of beams to the base station.

Here, the plurality of beams may be a beam transmitted from one of the base stations or a beam transmitted from various base stations.

The base station manages the beam to be used for data transmission based on the beam status information received from the terminal and selects one or more of the plurality of beams as a beam to be used for data transmission. Then, it informs the terminal about the beam selected for data transmission (3).

The base station transmits data using the selected beam, and the terminal receives the data through the corresponding beam (4).

Here, the base station can divide and manage the beams used for data transmission into a plurality of groups.

FIG. 8 shows an example of a method by which a base station manages a plurality of beams in a wireless communication system that transmits and receives data on a multi-beam basis.

Referring to FIG. 8, a base station can divide and manage beams used for data transmission into three sets.

For example, the base station can classify and manage a beam used for data transmission into an active beam set, a candidate beam set, and an idle beam set.

The active beam set includes beams used for data transmission in the actual transmission unit and can be set by higher layer signaling (e.g., RRC message). The beams included in the active beam set are transmitted using L1 (PDCCH Downlink Control Information) or L2 (Mac Control Element).

The candidate beam set includes beams that can be used as an active beam when the signal is good according to the measurement result of the terminal. Thus, the beams included in the candidate beam set can be changed to the active beam set according to the beam status information reported from the terminal.

That is, according to the beam status information received from the terminal, the base station can add or delete beams to the active beam set actually used for data transmission and a candidate beam set that may be used for data transmission in future, and manage the beams used for data transmission have.

Alternatively, a list of beams to be added to the active beam set from the terminal and a list of beams to be deleted from the active beam set may be received, and an active beam set may be set based thereon.

The idle beam set is not managed by the base station but includes beams that the terminal can measure through a synchronization channel (SS Block) and report as needed. The beams included in the idle beam set can be changed to the active beam set or the candidate beam set according to the report of the terminal.

FIG. 9 shows an example of a method of setting an active beam set according to the management method of such a beam.

Referring to FIG. 9, when a terminal reports beam status information to a base station, the base station checks the quality of beams according to the beam status information. Alternatively, a list of beams to be added to the active beam set from the terminal and a list of beams to be deleted may be received. Then, the beam to be added to the active beam set and the beam to be deleted are selected according to the quality of the beam.

For example, when the first beam, the second beam, the third beam, and the fourth beam are set as the active beam sets and data transmission is performed, the beam quality of the first beam is degraded according to the beam status information reported by the terminal, It can be confirmed that the quality of the beam is increased.

The base station checks the state of the beam according to the beam status information received from the terminal, removes the first beam from the active beam set, and adds the fifth beam to the active beam set to generate a new active beam list.

And informs the terminal about the beam included in the active beam set so that the terminal can receive the data through the beam included in the active beam set.

Information about the beam included in this active beam set can be communicated to the terminal in various manners.

In one example, the base station may transmit a list of all beams included in the active beam set to the terminal.

That is, when the base station receives the beam status information from the terminal, it selects a beam to be added to the active beam set and a beam to be deleted based on the beam status information. When the active beam set is set according to the beam status information, a list of all beams included in the set active beam set is provided to the terminal.

The list of such beams may include the ID of the beam, and the ID of the beam may be composed of the ID of the group including the beams which can not be transmitted simultaneously with each other and the index of the beam included in the group.

That is, there is a need for a method of distinguishing between specific beams because simultaneous support (transmission) from the base station may be difficult (for example, simultaneous transmission of multiple beams belonging to one Radio Front Unit (RFU) or TP (Transmission Point) is difficult) Do.

For this purpose, the beam ID is composed of a group ID (beam group ID having the same RFU or TP) and a unique ID (or beam index) capable of distinguishing the beams in the group as follows.

- Beam ID = Group ID + Beam Unique ID

In this manner, when the terminal reports and receives a list of all beams, the terminal can simultaneously report to the base station the desired number of beams, check the list of all beams included in the active beam set and use it for data reception, There is a problem that the size of the message increases.

Therefore, as another example, the base station may transmit the number of beams to be used for data transmission among the beams having good beam conditions to the terminal, and provide information about the beam used for data transmission to the terminal.

FIG. 10 shows another example in which a base station informs a mobile station of an active beam set, and shows a method of indicating the number of beams used for data transmission.

Referring to FIG. 10, the UE measures a beam state based on a beam reference signal received from a base station, and transmits beam state information according to the measured result to a base station.

For example, the UE may report the list sorted according to the signal size from the first beam to the Nth beam to the base station.

When the base station receives the beam status information from the terminal, the base station sets the number of beams to be used for data transmission and transmits information about the number of beams used for data transmission to the terminal.

For example, when a base station uses three beams for data transmission, the base station informs the terminal of the number of beams 3 used for data transmission. When the UE receives the number 3 of beams used for data transmission, the UE receives data using three beams (e.g., No. 1 beam, No. 2 beam, No. 3 beam) in the beam list reported by the UE .

In other words, compared with the method of transmitting the list of all beams used for data transmission by the base station to the terminal, the information about the beam used for data transmission can be informed to the terminal while decreasing the size of the message by informing only the number of beams have.

Meanwhile, the method of transmitting the beam list or the number of beams requires time for setting the beam for data reception when the terminal receives the information about the beam used for data transmission. Therefore, a time delay may occur in receiving data using a beam reported by the terminal as a beam having a good state.

The embodiments are directed to a method of enabling a terminal to immediately receive a beam using a stateful beam by indicating a beam to be used for data transmission by using a predefined value in indicating a beam used for data transmission by the base station .

11 shows an example of the beam direction information transmitted from the base station to the mobile station, and shows the case where the beam direction information is composed of two bits.

Referring to FIG. 11, when the active beam set includes the first beam and the second beam, the base station transmits beam direction information indicating a beam to be used for data transmission to the mobile station. Then, the terminal receives the data using the beam according to the beam instruction information received from the base station.

For example, if the base station transmits beam indication information of "00 ", the terminal receives the data using the first beam. When the base station transmits beam indication information of "01 ", the terminal receives data using the second beam. When the base station transmits beam direction information of "10 ", the terminal receives data using the first beam and the second beam.

Here, the base station may indicate a beam to be used for data transmission using a predefined value in the beam direction information.

For example, if the base station sets "11" to a predefined value (or a reserved value) and transmits "11" as the beam indication information, the terminal uses the beam of the last reported beam .

That is, the terminal may report the beam status information to the base station, receive the beam direction information from the base station, and set the corresponding beam as a beam to be used for data reception. Therefore, when the terminal receives predefined beam indication information from the base station, the last reported beam is directly used for data reception, so that data is received using a beam having a good condition without a time delay occurring in beam setting .

In addition, it is also possible to perform a procedure of receiving predefined beam direction information and setting the beam as an active beam in parallel while receiving data using the beam.

Accordingly, the terminal immediately receives the data using the best beam, and sets the beam as an active beam so that it can be used for data reception thereafter.

FIG. 12 illustrates a method of receiving data on a multi-beam basis by a terminal according to the present embodiments.

Referring to FIG. 12, the UE sequentially receives a beam reference signal for one or more beams from a base station (S1200).

The terminal measures the state of the received beam (S1210), generates beam state information, and transmits the beam state information to the base station (S1220).

The base station that has reported the beam status information from the terminal sets the beam to be used for data transmission to the active beam set according to the state of the beam. Then, beam indication information on the beam list included in the active beam set is transmitted to the terminal.

The terminal receives the beam direction information from the base station (S1230), and receives the data transmitted from the base station using the beam according to the beam direction information (S1240).

Here, the terminal may receive the entire beam list included in the active beam set as the beam indication information or the information on the number of beams used for data transmission.

Alternatively, a predefined value may be received from the base station as beam indication information. In this case, the terminal finally receives the data using the beam having a good status among the beams reported to the base station.

Therefore, according to the present embodiments, it is possible to receive data using multiple beams set in the active beam set based on the beam status information reported by the terminal, It is possible to receive data using a beam having a good state without a time delay according to the active beam setting.

FIG. 13 illustrates a method of transmitting data on a multi-beam basis by a base station according to the present embodiments.

Referring to FIG. 13, a base station transmits beam reference signals for one or more beams to a mobile station at predetermined time intervals (S1300).

The base station receives the beam status information from the terminal, which is obtained by measuring the status of the beam on the basis of the beam reference signal (S1310). Then, a beam list included in the active beam set is set based on the beam state information.

The base station transmits beam indication information indicating a beam to be used for data transmission to the mobile station based on the active beam set (S1320), and transmits data to the mobile station using the beam (S1330).

At this time, the base station may transmit the beam direction information (first beam direction information) indicating the beam set in the active beam set to the terminal, or may transmit the beam direction information indicating the best beam 2 beam direction information) to the terminal.

That is, when the base station transmits the first beam direction information, the terminal receives the data using the beam indicated by the first beam direction information among the beams set to the active beam set. Then, when the base station transmits the second beam direction information, the terminal receives the data using the beam of the last good beam.

The predefined value in the beam indication information indicates the beam recently reported by the terminal, so that the beam can be changed into a beam having a good state without a procedure for setting it into an active beam set so that the terminal can receive the data.

The BS may transmit the second beam direction information to the BS to receive the data using the beam recently reported by the MS, and the BS may perform a procedure of setting the beam, which has recently been reported by the MS in parallel, as the active beam.

FIG. 14 is a diagram showing a configuration of a user terminal 1400 according to the present embodiments.

14, the user terminal 1400 according to the present embodiment includes a receiving unit 1410, a control unit 1420, and a transmitting unit 1430.

The receiving unit 1410 receives downlink control information, data, and messages from the base station through the corresponding channel.

The control unit 1420 controls the overall operation of the user terminal 1400 according to the method of transmitting and receiving data on a multi-beam basis according to the above-described embodiments.

Specifically, the controller 1420 measures the beam status based on the beam reference signal received from the base station and transmits the beam status information to the base station. The user terminal 1400 may transmit the measured information of the state of each beam to the base station and may transmit the list to be added to the active beam set and the list to be deleted to the base station according to the beam status. Also, the user terminal 1400 may transmit a list of all beams or a list of beams to the base station in a good state order.

The user terminal 1400 receives information about the selected beam based on the beam status information from the base station via the beam direction information. The user terminal 1400 identifies the beam used for data transmission based on the beam direction information and receives the data using the beam.

The transmitter 1430 transmits uplink control information, data, and a message to the base station through the corresponding channel.

15 is a diagram illustrating a configuration of a base station 1500 according to the present embodiments.

Referring to FIG. 15, a base station 1500 according to the present embodiment includes a control unit 1510, a transmission unit 1520, and a reception unit 1530.

The control unit 1510 controls the overall operation of the base station 1500 according to the method of transmitting and receiving data on a multi-beam basis according to the above-described embodiments.

Specifically, the base station 1500 transmits the beam reference signal to the terminal and receives beam state information regarding the measured beam state based on the beam reference signal. Then, the active beam set is set based on the beam state information, and a beam to be used for data transmission is selected based on the active beam set.

The base station 1500 informs the terminal of the beam to be used for data transmission through the beam indication information and transmits the data using the corresponding beam.

At this time, the base station 1500 may transmit a predefined value as the beam indication information, and allow the terminal to receive the data using the beam having the best beam status reported last by the terminal. That is, the terminal can immediately receive the data using the beam having the best beam status reported recently by the terminal without a time delay according to the beam setting.

The transmitting unit 1520 and the receiving unit 1530 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

The standard content or standard documents referred to in the above-mentioned embodiments constitute a part of this specification, for the sake of simplicity of description of the specification. Therefore, it is to be understood that the content of the above standard content and portions of the standard documents are added to or contained in the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (20)

A method for a terminal to receive data on a multi-beam basis,
Receiving a beam reference signal for one or more beams from a base station;
Measuring a state of the at least one beam based on the beam reference signal and generating beam state information;
Transmitting the beam status information to the base station; And
Receiving beam indication information from the base station and receiving transmitted data using the selected beam based on the beam status information in accordance with the beam indication information.
The method according to claim 1,
If the beam indicating information is the first beam indicating information, receiving data transmitted using the beam set through the upper layer signal, and if the beam indicating information is the second beam indicating information, A method for receiving transmitted data using a beam having the best state.
3. The method of claim 2,
And setting the beam having the best beam state from the beam state information as an active beam through an upper layer signal if the beam direction information is the second beam direction information.
The method according to claim 1,
Wherein the beam indicating information is information including a list of all beams used by the base station to transmit data.
The method according to claim 1,
The beam direction information is information including the number N of beams used by the base station to transmit data, and the terminal uses the beam state information to receive data using N beams having the best beam state .
The method according to claim 1,
Wherein the beam indicating information is information indicating one or more beams included in each group in the plurality of groups.
The method according to claim 1,
If the base station sets a beam included in the active beam set and the candidate beam set based on the beam state information, the terminal receives information about the beam included in the active beam set via an upper layer signal.
8. The method of claim 7,
Dividing the active beam set and a beam not included in the candidate beam set into an idle beam set and measuring the state of the beam included in the idle beam set through the synchronization channel and reporting to the base station.
A method for a base station to transmit data on a multi-beam basis,
Transmitting a beam reference signal for one or more beams to a terminal;
Receiving beam state information for the at least one beam measured based on the beam reference signal;
Setting a beam included in the active beam set and a beam included in the candidate beam set based on the beam state information, and transmitting the beam direction information to the terminal; And
And transmitting the data using the selected beam according to the beam indication information.
10. The method of claim 9,
If the beam indicating information is the first beam indicating information, data is transmitted using a beam set through an upper layer signal, and if the beam indicating information is the second beam indicating information, A method of transmitting data using the best beam.
11. The method of claim 10,
And selecting the beam having the best beam state from the beam state information as an active beam through an upper layer signal if the beam direction information is the second beam direction information.
10. The method of claim 9,
Wherein the beam indicating information is information including a list of all beams used by the base station to transmit data.
10. The method of claim 9,
The beam direction information is information including the number N of beams used by the base station to transmit data, and the base station transmits data using the N beams having the best beam state from the beam state information .
10. The method of claim 9,
Wherein the beam indicating information is information indicating one or more beams included in each group in the plurality of groups.
10. The method of claim 9,
And setting the beam included in the active beam set and the beam included in the candidate beam set based on the beam state information to transmit information about the beam included in the active beam set through an upper layer signal.
16. The method of claim 15,
Dividing the active beam set and a beam not included in the candidate beam set into an idle beam set and receiving a result of the terminal measuring the state of the beam included in the idle beam set through a synchronization channel.
In a terminal receiving data on a multi-beam basis,
A receiver for receiving a beam reference signal for one or more beams from a base station; And
And a controller for measuring the state of the at least one beam based on the beam reference signal, generating beam state information, and transmitting the beam state information to the base station,
Wherein the receiving unit receives the beam direction information from the base station and receives the transmitted data using the beam selected based on the beam state information transmitted last according to the beam direction information.
18. The method of claim 17,
If the beam direction information is the first beam direction information, the data transmitted using the beam set through the upper layer signal is received, and if the beam direction information is the second beam direction information, A terminal that receives data transmitted using a beam.
19. The method of claim 18,
And if the beam direction information is the second beam direction information, sets the beam having the best beam state from the beam state information as an active beam through an upper layer signal.
18. The method of claim 17,
Wherein the base station sets information about the beam included in the active beam set through an upper layer signal when the base station sets a beam included in the active beam set and the candidate beam set based on the beam state information.

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