KR20170117859A - Method and apparatus for transmitting and receiving a signal using a beamforming in a communication system - Google Patents

Abstract

This disclosure relates to a 5G or pre-5G communication system to support higher data rates after a 4G communication system such as LTE. A method of transmitting and receiving signals in a terminal of a mobile communication system according to an embodiment of the present invention includes receiving first information including a request for information related to a beam from a base station; Transmitting second information including information related to the beam to the base station based on the first information; And modifying at least one of a transmit beam and a receive beam associated with the base station based on the first information and the second information. According to embodiments of the present disclosure, each node in a communication system can efficiently exchange at least one of beam change information and control information for applying beamforming.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and apparatus for transmitting and receiving signals through beamforming in a communication system,

Embodiments of the present invention relate to a method for transmitting and receiving information for transmitting and receiving signals through beamforming in a communication system and an apparatus using the same. More particularly, the present invention relates to a method for changing at least one of a transmission beam and a reception beam at each node transmitting and receiving signals in a communication system using beamforming, and an apparatus using the same.

Efforts are underway to develop an improved 5G or pre-5G communication system to meet the growing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G network) communication system or after a LTE system (Post LTE).

To achieve high data rates, 5G communication systems are also being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). The 5G communication system includes a beamforming, a massive MIMO, a full-dimension MIMO (FD-MIMO), an array antenna, an analog beam-forming, And large scale antenna technologies are being discussed.

In order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Have been developed.

In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), the advanced connection technology, Filter Bank Multi Carrier (FBMC) (non-orthogonal multiple access), and SCMA (sparse code multiple access).

Also, beamforming can be applied in the digital domain and the analog domain in the base station / terminal of the communication system. Also, there is a need for an appropriate beam for analog beamforming and a method and apparatus for effectively transmitting and receiving such information.

An embodiment of the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method and apparatus for transmitting and receiving beam change and control information for operating analog beamforming in a communication system. It is another object of the present invention to provide a method of operating a base station and a terminal for transmitting and receiving beam change and control information for operating an analog beamforming to achieve a high data rate, and an apparatus using the same.

According to an aspect of the present invention, there is provided a method of transmitting / receiving signals in a mobile communication system, the method comprising: receiving first information including a beam-related information request from a base station; Transmitting second information including information related to the beam to the base station based on the first information; And modifying at least one of a transmit beam and a receive beam associated with the base station based on the first information and the second information.

According to another aspect of the present invention, there is provided a method of transmitting / receiving a signal in a base station of a mobile communication system, the method comprising: transmitting first information including a beam- Receiving second information from the terminal, the second information including information related to the beam based on the first information; And modifying at least one of a transmission beam and a reception beam associated with the terminal based on the first information and the second information.

According to another aspect of the present invention, a terminal of a mobile communication system includes a transmitting and receiving unit for transmitting and receiving signals; And transmitting and receiving second information including information related to a beam based on the first information to the base station, and transmitting the first information including information related to the beam to the base station, And a control unit for changing at least one of a transmission beam and a reception beam associated with the base station based on the first information and the second information.

According to another aspect of the present invention, a base station of a mobile communication system includes a transmitting / receiving unit for transmitting / receiving signals; And transmitting and receiving first information including an information request related to a beam to the terminal, receiving second information from the terminal including information related to the beam based on the first information, And a controller for changing at least one of a transmission beam and a reception beam associated with the terminal based on the first information and the second information.

According to an embodiment of the present invention, each node can efficiently exchange at least one of beam change information and control information for applying beamforming in a communication system, and a beam suitable for a channel environment is managed, selected and applied The communication efficiency can be improved.

1 is a diagram for explaining a beam forming operation in a wireless communication system.
2 is a diagram illustrating a method for managing a beam list according to an embodiment of the present disclosure;
3 is a diagram illustrating a method for managing a beam list according to another embodiment of the present disclosure.
FIG. 4 is a diagram illustrating an uplink (UL) downlink control information (DCI) based beam control method according to an embodiment of the present invention.
5 is a diagram illustrating a UL DCI based beam control method according to another embodiment of the present invention.
6 is a diagram illustrating a UL DCI based beam control method according to another embodiment of the present invention.
FIG. 7 is a diagram illustrating a downlink (DL) DCI based beam control method according to an embodiment of the present invention.
8 is a diagram illustrating a DL DCI based beam control method according to another embodiment of the present invention.
9 is a diagram illustrating a DL DCI based beam control method according to another embodiment of the present invention.
10 is a diagram illustrating a beamforming method based on a medium access control-control element (MAC-CE) according to an embodiment of the present invention.
11 is a diagram illustrating a beam control method according to an embodiment of the present invention.
12 is a diagram illustrating a beam control method based on a beam control identifier included in a DCI according to an embodiment of the present invention.
13 is a diagram illustrating a beam control method based on a beam control identifier included in a DCI according to another embodiment of the present invention.
14 is a diagram illustrating a beam control method based on a beam control identifier included in a beam information report message according to an embodiment of the present invention.
15 is a diagram illustrating a beam control method based on a beam control identifier included in a beam information report message according to another embodiment of the present invention.
16 is a diagram illustrating a beam control method based on a beam control identifier included in a beam information report message according to an embodiment of the present invention.
17 is a diagram illustrating a beam control method using an acknowledgment message based on a beam control identifier included in a beam information report message according to another embodiment of the present invention.
18 is a view for explaining a beam changing method based on a threshold value according to an embodiment of the present invention.
19 is a view for explaining a beam changing method based on a threshold value according to another embodiment of the present invention.
20 is a view for explaining a beam changing method based on a threshold value according to another embodiment of the present invention.
21 is a diagram illustrating a selective beam changing method according to an embodiment of the present invention.
22 is a diagram illustrating a terminal according to an embodiment of the present invention.
23 is a diagram illustrating a base station according to an embodiment of the present disclosure.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the embodiments, description of technical contents which are well known in the technical field of this specification and are not directly related thereto will be omitted. This is to omit unnecessary explanations so as to communicate more clearly without blurring the gist.

For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In the drawings, the same or corresponding components are denoted by the same reference numerals.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

At this point, it will be appreciated that the combinations of blocks and flowchart illustrations in the process flow diagrams may be performed by computer program instructions. These computer program instructions may be loaded into a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, so that those instructions, which are executed through a processor of a computer or other programmable data processing apparatus, Thereby creating means for performing functions. These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory The instructions stored in the block diagram (s) are also capable of producing manufacturing items containing instruction means for performing the functions described in the flowchart block (s). Computer program instructions may also be stored on a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible for the instructions to perform the processing equipment to provide steps for executing the functions described in the flowchart block (s).

In addition, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function (s). It should also be noted that in some alternative implementations, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may actually be executed substantially concurrently, or the blocks may sometimes be performed in reverse order according to the corresponding function.

Herein, the term " part " used in the present embodiment means a hardware component such as software or an FPGA or an ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card.

Although the communication system applying beamforming is described as an example of the embodiment, the embodiment of the specification is not limited to such a system, and the gist of each embodiment can be universally applied to other systems.

Also, in the first embodiment, information transmitted / received for beam control may include information transmitted / received for beam change, and beam control may be referred to as beam change.

1 is a diagram for explaining a beam forming operation in a wireless communication system.

A wireless communication system includes a plurality of nodes (e.g., a base station and a plurality of terminals), and one node searches for an optimal beam for wireless communication with a counterpart node and transmits an optimum beam Can be set. In an embodiment, at least one of analog beamforming and digital beamforming may be applied for beamforming. The analog beamforming can be performed by adjusting the shape and direction of the beam using the difference in amplitude and phase of the carrier signal in the RF band. Digital beamforming processes a signal by adding a weight vector to a digitized signal, so that an RF signal from each antenna is passed to a digital band through a separate RF transmitter / receiver. Digital beamforming can realize beamforming through digital signal processing, which can generate a sophisticated beam according to the communication demand according to the signal processing ability.

Each node may form a Tx beam and a Rx beam. In order to find a beam suitable for communication by each node, each node may transmit an entire beam A full beam sweep can be performed. A process of searching for an optimal beam for a correspondent node may be referred to as beam searching, and a related reference signal may be transmitted and received.

In the first embodiment, the reference signal may include a cell-specific reference signal and a UE-specific reference signal, and each signal may be periodically or aperiodically transmitted. An example of the reference signal may be a beam reference signal (BRS) and a beam refinement reference signal (BRRS).

In an embodiment, the BRS may be periodically transmitted and may be a cell-specific reference signal. Also, in the embodiment, the BRRS is a UE-specific reference signal and can be transmitted aperiodically. In another embodiment, the BRRS is a UE-specific reference signal and the allocation of the BRRS may be static or semi-static, and may be periodically or aperiodically transmitted within the allocated time period.

In an exemplary embodiment, the terminal measures at least one of the BRS and the BRRS transmitted from the base station and reports information on specific beams to the base station. The information reported to the base station may include at least one of the following.

- BRS-based beam state information (BSI): The beam index (BI) of the corresponding beam and the quality information of the corresponding beam (for example, beam reference signal received power (BRSRP), beam reference signal quality signal strength indicator (BRSSI).

- BRRS-based beam refinement information (BRI): a BRRS resource index (BRRS-RI) for identifying a BRRS beam and quality information of the corresponding beam (for example, BRRS received power (BRRS-RP)

The information about the beam may be transmitted through an uplink channel transmitted from a subscriber station to a base station, and may be transmitted through at least one of an uplink control channel and a data channel. The base station requests the base station to report on the beam information, and the base station maintains and updates the beam information for each base station through a signaling process in which the base station transmits the information about the specific beams to the base station. In the embodiment of the present invention, a base station includes control information including a command relating to beam change in a control message, transmits the control information to the terminal, and performs beam modification according to the command. The beam change command is described as a representative embodiment of LTE-based downlink control information (DCI) or medium access control-control element (MAC-CE), and there is no limitation on the type of control message used.

The base station can set a common beam list for beam change of at least one of the base station and the terminal based on BSI or BRI reported from the terminal. In the embodiment, setting or updating the beam list may be performed through one or more of the following two methods.

Update Method 1: The base station reports periodically or non-periodically information on the best N beams to at least one of BRSRP and BRRS-RP measured by the terminal, You can maintain information about the best N beams, and you can also update the information you maintain. In the embodiment, N may be a predetermined natural number, and may be variably applied through exchange of information between the base station and the terminal. Also, the number of N's can be flexibly adjusted according to the channel environment.

Update method 2: The base station periodically or non-periodically reports the information of the best N beam from the terminal, generates a beam list based on the received information based on the base station, and transmits the generated beam list information to the terminal To update the beam list.

In the update scheme 1, information for applying a beam list can be exchanged without additional signaling between the base station and the terminal. In the update scheme 2, the base station shares information about the beam list with the terminal through specific signaling or message transmission. Even in the case of the update scheme 1, the base station can share modified beam list information for a specific purpose to the mobile station. Thus, at least one of the update schemes 1 and 2 can be applied to maintain and update the beam list.

Specific signaling or message transmission is possible for the base station to transmit information related to the beam list to the terminal, and the following methods can be applied.

- A method of transmitting beam list related information to a terminal using at least one of upper layer signaling, DCI, and MAC-CE including at least one of radio resource control (RRC) and system information (SI) In case of DL DCI + xPDSCH (phsycal downlink shared channel), it transmits the beam list related information to the UE using the xPDSCH transmitted from the base station to the UE based on the DL grant allocated by the DCI

- In case of UL DCI + xPUSCH (physical uplink shared channel), beam list related information is transmitted through DCI and ACK / NACK information is received from UE through xPUSCH

- In case of UL DCI + xPUCCH (physical uplink control channel), beam list related information is transmitted through DCI and ACK / NACK information is received from terminal through xPUCCH. Indication information that is additionally required while transmitting the beam list information can be transmitted to the same signal simultaneously or separately to other signals. For example, when a base station refers to a specific beam to be applied to a beam change from a plurality of beam lists, or when referring to a beam set, the base station can transmit indication information including the indication information necessary for beam change to the terminal.

In an embodiment, the DCI may be transmitted from the base station to the terminal via a physical downlink control channel (xPDCCH).

Also, in the embodiment, xPDSCH, xPUSCH, xPUCCH, and xPDCCH may be one variation of PDSCH, PUSCH, PUCCH, and PDCCH or the same configuration, respectively.

In one embodiment, when beam-list-related information is transmitted to the terminal through the MAC CE, a method of indicating the beams included in the list by the bit map method is also possible. The sort order of the bit map can be changed according to decoding. The size of each field can be changed. An example of each field is as follows.

In an embodiment, xPUSCH and xPUCCH may be the same or similar channels as PUSCH and PUCCH, respectively.

Indication bits Beam indication 00 # One 01 # 3 10 # 2 11 # 7

Table 1 shows an example of a beam list according to an embodiment of the present invention. The indication bit is the information transmitted to indicate the beam included in the beam list, and the beam indication indicates the beam index corresponding to the indication bit.

When the corresponding beam list is shared between base station terminals, the base station can use it to indicate the beam as a specific use. For example, the base station can be used for designating a specific beam to indicate a change to the corresponding beam, or for designating a beam that can not be used by the terminal and controlling the change to the corresponding beam. In the embodiment, two bits can be used to indicate the beam, which can be applied variably. Also, the beam index corresponding to each indication bit may be updated according to the report of the terminal or the necessity of the base station. More specifically, the correspondence relationship between the indication bit and the beam indication can be updated based on the beam-related information reported by the UE. More specifically, when the base station transmits control information including 01 indication bits to the terminal for beam change, the terminal can use a beam corresponding to # 3 for signal transmission / reception with the base station based on the control information.

Also, in the embodiment, corresponding to the transmission of the beam list information, at least one of the base station and the terminal may perform a beam change applied to communication with each other. More specifically, the base station transmits the beam list to the terminal, and the terminal and the base station change the beam from the specific point to the index (# 1 in Table 1) indicated by the most significant bit (00 in Table 1) after transmission of the beam list . The beam change may be selectively applied to the entire channel or a specific channel group.

Indication bits Beam indication 00 UL: # 2, DL: # 1 01 UL: # 1, DL: # 3 10 UL: # 3, DL: # 2 11 UL: # 7, DL: # 7

Table 2 shows another example of a beam list according to the embodiment of the present invention. The Indication bit is the information transmitted to indicate the beam included in the beam list, and the beam indication indicates the beam index corresponding to the indication bit. In an embodiment, each indication bit may be different or may indicate the same uplink and downlink beams. In this example, the Beam list for UL and the DL Beam list are operated separately, and the BS can transmit information about two beam lists to the UE.

When the corresponding beam list is shared between base station terminals, the base station can use it to indicate the beam as a specific use. For example, the base station can point to a particular beam and change it to the indicated beam. Also, according to the embodiment, the BS can indicate a beam that can not be used by the UE, and can also be used to control the use of the beam by the UE.

In the embodiment, when the base station transmits 10 as an indication bit to the terminal, the terminal applies a beam corresponding to # 3 in the uplink and a beam corresponding to # 2 in the downlink.

Also, in the embodiment, corresponding to the transmission of the beam list information, at least one of the base station and the terminal may perform a beam change applied to communication with each other. More specifically, the base station transmits the beam list to the terminal, and the terminal and the base station can change the beam from the specific point in time after transmission of the beam list to the beam corresponding to the feature index in the beam list. More specifically, the terminal and the base station change the beam to a beam corresponding to # 1 indicated by 00 from a specific point in the first channel group (eg DL), and the 01 to the second channel group (eg UL) It is possible to change the beam with the beam corresponding to # 1. The channel group may be variously applied as described in the following embodiments, and the changed beam may be applied to only some channels such as a control channel or a data channel in the downlink or uplink.

In one embodiment, when a base station needs to receive data signals of all users in one beam for multiplexing of UL multiplex users, the base station temporarily instructs the users who are multiplexing to change the same base station beam After UL data transmission / reception is completed, each user can perform beam modification with a beam that has been used or a new optimal beam. The above embodiment can be utilized when a common beam change of a base station or a plurality of terminals is required in addition to an uplink multi-user MIMO (UL MU-MIMO).

Also, in the embodiment, when beam list management is performed based on four lists as shown in Table 2, some indexes may provide beam information for the first group and other indexes may provide beam information for the second group. More specifically, it may include beam information for the first group in case of 00 and 10, and beam information for the second group in case of 10, 11. At this time, the beam information of each of the two groups may be updated through the same signal or may be updated.

It can be set to change the beam to the index indicated by the most significant bit (00 in Table 1) (# 1 in Table 1). The beam change may be selectively applied to the entire channel or a specific channel group.

In this embodiment, since two beam lists are operated, the base station can additionally signal information about which beam to be indicated in which beam list.

Also, depending on how the indication bit is transmitted, it may be determined whether to indicate an uplink beam or a downlink beam. More specifically, when the indication bit is transmitted through the DL DCI, only the beam corresponding to the downlink is changed to the downlink beam corresponding to the indication bit. When the indication bit is transmitted through the UL DCI, only the beam corresponding to the uplink corresponds to the indication bit Uplink beam.

2 is a diagram illustrating a method for managing a beam list according to an embodiment of the present disclosure;

Referring to FIG. 2, in an embodiment, the terminal 201 can transmit and receive signals with the base station 202.

In step 210, the base station 202 may transmit a reference signal to the terminal 201. In an embodiment, the reference signal may include at least one of BRS and BRRS.

In step 215, the UE 201 can determine N best N beams based on the received reference signal. In the embodiment, N may be a predetermined natural number between the base station 202 and the terminal 201.

In step 220, the terminal 210 may transmit the measured beam information to the base station 202. In an embodiment, the terminal may transmit information about some or all of the N beams.

In step 225, the base station can update the beam list information based on the received information. In one embodiment, the same beam list is managed between the terminal 201 and the base station 202, and based on this, it is possible to indicate an index of a beam to be changed when a beam is changed.

3 is a diagram illustrating a method for managing a beam list according to another embodiment of the present disclosure.

Referring to FIG. 3, a terminal 301 and a base station 302 can transmit and receive signals.

In step 310, the terminal 301 may transmit beam information measured by the base station 302. The terminal 301 may generate beam information based on the reference signal received from the base station 302 and may transmit beam information to the base station 302 by changing some information in the previously managed beam list It is possible.

In step 315, the base station 302 may perform beam list information update based on the received information. In the embodiment, the beam list may include N beams determined based on information transmitted / received between the UE and the BS, and index information indicating each beam may be generated.

In step 320, the base station 302 may transmit the updated beam list information to the terminal 301. The updated beam list information may be transmitted as an upper layer signal including RRC or SIB, or may be transmitted through a downlink data channel or a downlink control channel.

In step 325, the terminal 301 can transmit / receive a signal to / from the base station 302 based on the received beam list information.

Resource allocation on a downlink (DL) or uplink (UL) channel of a terminal can be performed based on downlink control information (DCI) transmitted from a base station. Hereinafter, a method for DCI-based beam modification will be described as one embodiment.

FIG. 4 is a diagram illustrating an uplink (UL) downlink control information (DCI) based beam control method according to an embodiment of the present invention.

Referring to FIG. 4, the terminal 401 and the base station 402 can transmit and receive signals. Signals can be transmitted and received.

In step 410, the base station 402 may transmit UL DCI including beam change information to the terminal 401. The beam change information may include indication information indicating a beam to be changed. More specifically, the beam change information includes at least one BI or BRRS-RI. It may also transmit additional information related to the beam being changed.

In step 415, the terminal 401 can change the beam for signal transmission / reception with the base station 402 based on the received information. More specifically, it is possible to transmit a signal by applying the changed beam corresponding to the UL channel transmission point indicated through the UL DCI. In step 420, the base station 402 may change the beam corresponding to the terminal 401 based on the information transmitted in step 410. The beam change may be performed at the same time in the base station 402 and the terminal 401 but is not limited thereto and may be changed at a timing capable of transmitting and receiving at least one of xPUCCH and xPUSCH transmitted based on the UL DCI There.

In step 425, the terminal 401 may transmit at least one of xPUCCH and xPUSCH by applying the modified beam.

In this embodiment, the base station 402 indicates the beam information through the UL DCI to the terminal 401, and the beam change of the terminal and the base station can be performed in response to UL channel transmission / reception assigned by the UL DCI. Also, it is possible to transmit and receive signals through the changed beam by changing the transmission beam and the reception beam of the base station and the terminal in response to the transmission of the channel indicated through the DCI.

5 is a diagram illustrating a UL DCI based beam control method according to another embodiment of the present invention.

Referring to FIG. 5, the terminal 501 and the base station 502 can transmit and receive signals. Signals can be transmitted and received.

In step 510, the base station 502 may transmit the UL DCI including the beam change information to the terminal 501. The beam change information may include indication information indicating a beam to be changed. More specifically, the beam change information includes at least one BI or BRRS-RI. It may also transmit additional information related to the beam being changed.

In step 515, the UE 501 may transmit at least one of xPUCCH and xPUSCH indicated by the UL DCI.

In a first modification of the present embodiment, in steps 520 and 525, the terminal 501 and the base station 502 can respectively perform a beam change based on the information included in the message transmitted in step 510, The BS 502 transmits an ACK message to the MS in step 530, and the MS 501 receives the ACK message on the changed beam.

An ACK message may be transmitted from the BS 502 to the UE 501 in step 530 and may be transmitted to the BS 501 on the basis of steps 535 and 540 in response to at least one of transmission and reception of the ACK message. And the beam of the terminal 501 can be changed.

In this embodiment, the base station 502 instructs the terminal 501 to transmit the beam information through the UL DCI, and in response to the transmission of the ACK information for the uplink channel, You can make changes.

6 is a diagram illustrating a UL DCI based beam control method according to another embodiment of the present invention.

Referring to FIG. 6, a terminal 601 and a base station 602 can transmit and receive signals. Signals can be transmitted and received.

In step 610, the base station 602 may transmit UL DCI including beam change information to the terminal 601. [ The beam change information may include indication information indicating a beam to be changed. More specifically, the beam change information includes at least one BI or BRRS-RI. It may also transmit additional information related to the beam being changed.

In step 615, the terminal 601 may transmit at least one of xPUCCH and xPUSCH indicated by the UL DCI.

In step 620, the base station 602 may transmit an ACK corresponding to at least one of xPUCCH and xPUSCH to the terminal 601 in the subframe n.

In steps 625 and 630, the base station 602 and the terminal 601 may apply the changed beam according to the beam change information in the subframe n + k based on the received ACK, respectively. More specifically, the modified beam information may be applied to a signal transmitted or received after the subframe n + k. In the embodiment, the value of k may be a predetermined value. The k value may be transmitted from the Node B 602 to the UE 601 through an upper layer signal including at least one of RRC and SIB or included in the UL DCI transmitted in step 610. [ Also, in the embodiment, the k value may be 0. In this case, the base station and the UE can perform the beam change after the ACK transmission / reception time.

FIG. 7 is a diagram illustrating a downlink (DL) DCI based beam control method according to an embodiment of the present invention.

Referring to FIG. 7, a terminal 701 can transmit / receive a signal to / from a base station 702.

In step 710, the base station 702 may transmit the DL DCI including the beam change information to the terminal 701. [ The beam change information may include indication information indicating a beam to be changed. More specifically, the beam change information includes at least one BI or BRRS-RI. It may also transmit additional information related to the beam being changed.

In step 715, beam change may be performed according to the beam change information. The base station 702 may change the beam corresponding to the terminal 701 in response to performing the downlink channel transmission instructed through the DL DCI and the terminal 701 may also change the beam corresponding to the DL DCI Based on the information indicated in base station 702. < RTI ID = 0.0 >

In step 725, the base station 702 may transmit at least one of the xPDCCH and the xPDSCH to the terminal 701 with the changed beam, and the terminal 701 may receive at least one of the xPDCCH and xPDSCH with the changed beam.

In an embodiment, the terminal beam modification may be performed simultaneously with the change of the base station beam, but is not limited thereto, and may perform the beam modification at a suitable time for signal reception corresponding to step 725. [

8 is a diagram illustrating a DL DCI based beam control method according to another embodiment of the present invention.

Referring to FIG. 8, a terminal 801 can transmit and receive signals to and from a base station 802.

In step 810, the base station 802 may transmit the DL DCI including the beam change information to the terminal 801. [ The beam change information may include indication information indicating a beam to be changed. More specifically, the beam change information includes at least one BI or BRRS-RI. It may also transmit additional information related to the beam being changed.

In step 815, the base station 802 may transmit at least one of the xPDCCH and xPDSCH indicated by the DL DCI to the terminal 801. [

In a first modification of this embodiment, in step 820, the terminal 801 may change the beam corresponding to the base station 802 based on the DL DCI. In an embodiment, the terminal 801 can change the transmit and receive beams corresponding to the base station 802 and change at least one of the beam associated with the control channel, the data channel and the reference signal during the beam change, The base station 802 can change the beam corresponding to the terminal 801 based on the DL DCI.

In step 830, the terminal 801 may transmit an ACK for at least one of the xPDCCH and the xPDSCH indicated by the DL DCI to the base station 802. More specifically, the UE 801 may transmit an ACK for at least one of the xPDCCH and the xPDSCH indicated by the DL DCI to the base station 802 based on the changed beam in step 820. The base station 802 may receive the ACK from the terminal 801 based on the changed beam.

An ACK message may be transmitted from the UE 801 to the BS 802 in step 830 and may be transmitted to the BS 802 on the basis of steps 835 and 840 corresponding to at least one of transmission and reception of the ACK message. The terminal beam and the base station beam can be changed at the same time, but the present invention is not limited to this, and it is possible to transmit and receive an ACK message in step 830 to the changed beam, The beam change point can be determined.

After the downlink channel is transmitted, the beam change of the base station and the terminal can be performed corresponding to the transmission / reception timing of the ACK with respect to the reception of the corresponding channel.

9 is a diagram illustrating a DL DCI based beam control method according to another embodiment of the present invention.

Referring to FIG. 9, the terminal 901 can transmit / receive a signal to / from the base station 902.

In step 910, the base station 902 may send a DL DCI including the beam change information to the terminal 901. [ The beam change information may include indication information indicating a beam to be changed. More specifically, the beam change information includes at least one BI or BRRS-RI. It may also transmit additional information related to the beam being changed.

In step 915, the base station 902 can transmit at least one of the xPDCCH and the xPDSCH indicated by the DL DCI to the terminal 901. [

In step 920, the UE 901 may transmit an ACK for at least one of the xPDCCH and the xPDSCH indicated by the DL DCI to the base station 902 in subframe n

In steps 925 and 930, the UE 901 and the BS 902 can change the beam corresponding to the BS 902 and the UE 901 in the subframe n + k based on the DL DCI, respectively. More specifically, after the subframe n + k, the terminal 901 and the base station 902 can transmit / receive signals based on the beam indicated by the DL DCI. In the embodiment, the value of k may be a predetermined value. Also, the k value may be transmitted from the base station 902 to the UE 901 through an upper layer signal including at least one of RRC and SIB, or may be included in the DL DCI transmitted in step 910 and transmitted. Also, in the embodiment, the k value may be 0. In this case, the base station and the UE can perform the beam change after the ACK transmission / reception time.

In this manner, the UE can change the transmission beam or the reception beam corresponding to the base station based on the UL or DL DCI transmitted by the base station, and the base station can also change the transmission beam or the reception beam corresponding to the terminal. The timing of changing the indicated beam based on the DCI may vary according to the embodiment described above.

For example, the base station may transmit a DCI including the beam change information to the terminal. The DCI includes at least one BI or BRRS-RI, and may also include indication information for a specific channel or channel group corresponding to BI or BRRS-RI. In response, the base station and the terminal can transmit and receive the designated channel in the DCI field through the corresponding beam, respectively. By indicating the channel to which the beam to be changed is applied to the DCI, it is possible to transmit and receive a signal by applying the changed beam only to some of the downlink channel and the uplink channel.

In another embodiment, the base station can instruct the terminal to transmit the beam for the DL channel and the beam for the UL channel in the DCI, respectively, and the base station and the terminal apply the same or different beams to the DL channel and the UL channel, can do.

Further, in the embodiment, when the beam change information is transmitted through the DL DCI, the beam change information is applied only to the downlink related beam change, and when the beam change information is transmitted through the UL DCI, Can be applied. However, the present invention is not limited to performing the beam change mapping for the UL channel / DL channel in the UL DCI / DL DCI beam change command, and the beam change may be variably applied to a specific channel, a specific channel group, .

Also, in the embodiment, the time at which the beam change is applied may be such that, when the beam change related control information is received, the changed beam may be continuously applied until the next beam change related control information is received, or the beam change may be temporarily performed.

More specifically, it is possible to perform scheduling for at least one of the UL and the DL channels through the DCI, and transmit at least one of the BI and the BRRS-RI to the DCI. In this case, it is possible to temporarily perform the beam change only for the UL and DL signals indicated through the DCI, and then return to the original beam. Also, according to the embodiment, it is possible to indicate to the DCI whether or not the beam change information is temporarily applied through a separate indication or information, or to set the applicable time. The UL / DL channel indicated through the DCI includes a UL / DL reference signal allocated through the DCI, and can be applied to other channels as well. In the above embodiments, the beam change may be applied not only to the corresponding UL / DL transmission but also to the corresponding ACK transmission / reception time in the case of FIGS. 5 and 8. In the subframe n + k corresponding to a specific delay in FIGS. 6 and 9, A method of temporarily applying a change, and a method of temporally applying a beam change to a specific channel or a channel group in a corresponding subframe n + k may be applied. The particular channel or group of channels may be preset, or may be based on at least one of DCI, MAC-CE and RRC signaling. In addition, in the above embodiment, it is also possible to change the method to indicate to which Tx beam the corresponding BRRS falls when the Tx / Rx beam is corrected through the BRRS. That is, by instructing the beam index used by the base station in the BRRS transmission in the DCI allocating the BRRS through the corresponding DCI, the terminal can receive information on the beam to which the BRRS descends, .

10 is a diagram illustrating a beamforming method based on a medium access control-control element (MAC-CE) according to an embodiment of the present invention.

Referring to FIG. 10, a terminal 1001 can transmit and receive signals with a base station 1002.

In step 1010, the base station 1002 may transmit a MAC-CE including the beam change information to the UE 1001. [ The beam change information may include indication information indicating a beam to be changed. More specifically, the beam change information includes at least one BI or BRRS-RI. It may also transmit additional information related to the beam being changed.

In step 1015, the UE 1001 may transmit an ACK for the MAC-CE to the BS 1002 in the subframe n

The UE 1001 and the BS 1002 can change the beam corresponding to the BS 1002 and the UE 1001 in the subframe n + k based on the information included in the MAC-CE in steps 1020 and 1025 . More specifically, after the subframe n + k, the terminal 1001 and the base station 1002 can transmit / receive signals based on the beam indicated by the information included in the MAC-CE. In the embodiment, the value of k may be a predetermined value. The k value may be transmitted from the base station 1002 to the UE 1001 through an upper layer signal including at least one of RRC and SIB, or may be included in the MAC-CE transmitted in step 1010 and transmitted. Also, in the embodiment, the k value may be 0. In this case, the base station and the UE can perform the beam change after the ACK transmission / reception time.

In the embodiment, when transmitting the beam change command or the beam information to the MAC-CE, the BS can instruct the specific channel or the channel group, and can transmit information on the BI or BRRS-RI to be applied to the group. The beam change can be performed from the point of time when a specific delay is applied to the designated beam with respect to the designated channel according to the information. It is possible to temporarily transmit and receive the beam change information similarly to the case of transmitting the beam control information through the DCI.

Also, in the embodiment, when performing beam list information update corresponding to FIGS. 1 and 2, beam control information may be transmitted to perform beam modification. The base station and the terminal can manage a commonly used beam list, and according to an embodiment, the base station can transmit the beam list related information to the terminal and maintain and update the same beam list between the terminal and the base station. In the embodiment, when the N beam lists are managed, the BS can transmit the beam index related information to the UE periodically or aperiodically. In this embodiment, beam information change may be performed simultaneously when beam information is updated. At this time, the corresponding beam update information may be included in at least one of an upper layer signal including a DCI and an RRC message, and a control message (e.g., MAC-CE), and may be transmitted to the UE. It can be applied by various signaling such as shape.

Hereinafter, embodiments of the beam control method and the beam changing method according to the embodiment of the present invention will be described, and further, an optional case of beam change and error case processing in case of beam change will be described.

11 is a diagram illustrating a beam control method according to an embodiment of the present invention.

Referring to FIG. 11, a terminal 1101 can transmit / receive a signal to / from a base station 1102.

In step 1110, the base station 1102 may transmit information requesting the terminal 1101 for one of BSI and BRI. In one embodiment, the information may be transmitted to the terminal via the DCI.

In step 1115, the UE 1101 may transmit at least one of BSI and BRI to the Node B 1102 through at least one of xPUCCH and xPUSCH in subframe n. In an embodiment, at least one of the xPUCCH and xPUSCH may be indicated via the DCI. The beam information reported in the embodiment may include at least one beam information and may be sequentially reported from the highest quality beam.

In step 1120, the base station 1102 may perform beam modification on the subframe n + k based on the information received in step 1115. More specifically, the base station 1102 may perform beam modification when at least one of the corresponding beams BRSRP and BRRS-RP is compared with the currently used beam based on the received beam information. Also, in step 1125, the UE 1101 may perform beam modification on the subframe n + k based on the information transmitted in step 1115. [ More specifically, the terminal 1101 can perform the beam change when it is better when at least one of the corresponding beams BRSRP and BRRS-RP is compared with the currently used beam based on the transmitted beam information. In the embodiment, the beam change can be performed simultaneously in the base station and the terminal in the corresponding subframe. However, the present invention is not limited thereto, and the beam change can be performed so that signals can be transmitted and received in the changed subframe in a subsequent subframe including the subframe n + have.

In step 1130, the base station 1102 may send a signal to the terminal 1101 with the changed beam.

In the embodiment, the k value may be a preset value or may be indicated to the base station 1102 terminal by the following method.

More specifically, the k value may be indicated to the terminal in the DCI transmission. At least one bit may be assigned in the DCI for the k value indication, an example of which is set forth in Table 3. Table 3 discloses a method in which the base station indicates the k value through the 2-bit information.

Indication bits Delay (k) 00 4 01 5 10 6 11 7

Referring to Table 3, a delay value can be determined according to each indication bit. The correspondence between the indicator bits and the delay values in Table 3 is arbitrarily different depending on the implementation.

Also, in the embodiment, k values through different CRC masking may be indicated in the DCI transmission. More specifically, in the case of an indication through different CRC masking during DCI transmission, information can be transmitted by masking different CRCs attached to DCI information transmission. In an embodiment, the particular code may include all distinguishable codes including orthogonal code. Table 4 shows an example of indicating a delay value through CRC masking.

CRC  mask Delay (k) 0000000000000000 4 1111111111111111 5 0101010101010101 6 1010101010101010 7

Referring to Table 4, the k value can be determined based on the CRC masking of the DCI. In the embodiment, the correspondence relationship between the CRC masking and the k value may be applied differently.

Also, in the embodiment, different k values can be indicated through different scrambling sequences during the DCI transmission. More specifically, during the DCI transmission, different scrambling sequences may be applied to the DCI in order to indicate the k value through different scrambling sequences to indicate the k value.

Scrambling seq . Delay (k) a (i), i = 0, ... ., # of data symbol 4 b (i), i = 0, ... ., # of data symbol 5 c (i), i = 0, ... ., # of data symbol 6 d (i), i = 0, ... ., # of data symbol 7

Referring to Table 5, the k value can be indicated based on the scrambling sequence applied to the DCI. The correspondence between the scrambling sequence and the k value is illustrative, and each correspondence may vary according to the implementation.

In addition, the k value can be semi-staticly assigned through an upper layer signal including the RRC, and a fixed value agreed between the terminal and the base station can be used. In another embodiment, the k value may be determined based on one of the information conveyed via the RRC or DCI. For example, the k value may be determined based on the value transmitted to Asynchronous HARQ Timing.

The k value may also be indicated by a combination of at least two of the methods described above. For example, RRC Signaling may indicate candidates for certain k values, and indicate whether to apply any k values of the candidate values through bits, CRC masking, or scrambling sequences in the DCI.

In addition, the k value may be applied as k1 + k2, and the k1 and k2 may inform the terminal based on at least one of the methods for indicating k described above. For example, k1 may be applied as a fixed value, and the BS may variably transmit the k2 value to the UE in consideration of the channel condition.

Also, in the embodiment, the control information requesting the beam information reporting may include an indicator for indicating beam change, and it may be determined whether to perform the beam change based on the indicator.

12 is a diagram illustrating a beam control method based on a beam control identifier (e.g., a beam change identifier) included in a DCI according to an embodiment of the present disclosure.

Referring to FIG. 12, a terminal 1201 can transmit and receive signals to and from a base station 1202.

In step 1210, the base station 1202 can transmit information requesting one of BSI and BRI to the terminal 1201, and the information can be transmitted to the terminal through the DCI. In an embodiment, the DCI may include a beam control identifier (e.g., a beam change identifier). In FIG. 12, the process of transmitting the beam change request is described as being 'on'. A specific method for the beam change identifier will be described later.

In step 1215, the terminal 1201 may transmit at least one of BSI and BRI to the base station 1202 through at least one of xPUCCH and xPUSCH in subframe n. In an embodiment, at least one of the xPUCCH and xPUSCH may be indicated via the DCI. The beam information reported in the embodiment may include at least one beam information and may be sequentially reported from the highest quality beam.

In step 1220, the base station 1202 may perform the beam change on the subframe n + k based on the information received in step 1215 since the beam change identifier is set to on in the DCI transmitted in step 1210. In another embodiment, if the base station is better than a threshold value in order to control beam modification relative to the beam currently in use, at least one of the BRSRP and BRRS-RP of the corresponding beam, based on the received beam information, You can make changes. In an embodiment, the k value may be determined using the methods described previously. A threshold value for controlling the beam change will be described later. In step 1225, the UE 1201 may perform beam modification on the subframe n + k based on the information transmitted in step 1210. [ The beam change of the terminal 1201 can also determine whether to change the beam based on the threshold value. In the embodiment, the beam change can be performed simultaneously in the base station and the terminal in the corresponding subframe. However, the present invention is not limited thereto, and the beam change can be performed so that signals can be transmitted and received in the changed subframe in a subsequent subframe including the subframe n + have.

In step 1230, the base station 1202 can send a signal to the terminal 1201 with the changed beam, and the terminal 1201 can receive the signal with the changed beam.

In step 1230, the terminal 1201 may receive the signal with the changed beam, and more specifically, may receive the signal with the beam reported in step 1215 in a subsequent subframe including the subframe n + k.

13 is a diagram illustrating a beam control method based on a beam control identifier (e.g., beam change identifier) included in a DCI according to another embodiment of the present disclosure.

Referring to FIG. 13, a terminal 1301 can transmit / receive a signal to / from a base station 1302.

In step 1310, the base station 1302 can transmit information requesting one of BSI and BRI to the terminal 1301, and the information can be transmitted to the terminal through the DCI. In the embodiment, information indicating whether or not beam change is requested to the DCI may be included, and in the embodiment, whether to request the beam change may be indicated as off and transmitted. A specific method for the beam change identifier will be described later.

In step 1315, the UE 1301 may transmit at least one of BSI and BRI to the Node B 1302 through at least one of xPUCCH and xPUSCH in subframe n. In an embodiment, at least one of the xPUCCH and xPUSCH may be indicated via the DCI. The beam information reported in the embodiment may include at least one beam information and may be sequentially reported from the highest quality beam.

In step 1320, the terminal 1301 and the base station 1302 may not change at least one of the transmission beam and the reception beam since the identifier indicating whether the beam is changed or not included in step 1310 is indicated as off. Thus, the base station 1302 may report the beam-related information to the terminal 1301, and may not perform the beam change. Further, an additional beam changing procedure may be performed by base station control according to an embodiment.

An example of the beam change identifier will be described below.

According to one embodiment, in the above embodiment, beam change control can be indicated through the DCI. More specifically, it is possible to include a specific bit in the DCI and indicate whether to change the beam based on the specific bit. More specifically, the beam change may be performed when the specific indication bit is 0 when the DCI transmission is performed, and the beam change may be performed when the specific indication bit is indicated by 1. Also, even if the specific indicator is indicated as 1, the beam change may not be performed if the reported beam is the same as the current beam.

It can also indicate whether beam changes based on CRC masking and scrambling sequence.

CRC  mask Beam change indication 0000000000000000 OFF 1111111111111111 ON

Referring to Table 6, it is possible to indicate whether the beam is changed through different CRC masking during the DCI transmission. For example, when the CRC of the DCI is composed of 16 bits, the DCI may be masked to 0000000000000000 to indicate that the beam change is OFF, or may be masked to 1111111111111111 to indicate that the beam change indicator is ON. This is an example, and other correspondence may be applicable.

Scrambling seq . Beam change indication a (i), i = 0, ... ., # of data symbol OFF b (i), i = 0, ... ., # of data symbol ON

Referring to Table 7, different scrambling sequences may be applied during the DCI transmission to indicate whether to change the beam. For example, a scrambling sequence of the type shown in Table 7 can be applied to instruct ON and OFF of beam change.

Also, in the embodiment, it is possible to semi-statically indicate whether to change the beam according to the BSI and BRI requests through upper layer signaling such as RRC signaling.

Also, in the embodiment, when the terminal reports at least one of BSI and BRI, information indicating whether to change the beam may be included, and the beam change may be applied based on the information.

14 is a diagram illustrating a beam control method based on a beam control identifier included in a beam information report message according to an embodiment of the present invention.

Referring to FIG. 14, a terminal 1401 can transmit / receive a signal to / from a base station 1402.

In step 1410, the base station 1402 can transmit information requesting one of BSI and BRI to the terminal 1401, and the information can be transmitted to the terminal through the DCI.

In step 1415, the terminal 1401 may transmit at least one of BSI and BRI to the base station 1402 through at least one of xPUCCH and xPUSCH in subframe n. In an embodiment, at least one of the xPUCCH and xPUSCH may be indicated via the DCI. The beam information reported in the embodiment may include at least one beam information and may be sequentially reported from the highest quality beam. Also, an identifier indicating whether to change the beam together with at least one of the BSI and the BRI may be included and transmitted to the base station 1402. In the embodiment, the indicator may be turned on to instruct beam change, and the method of displaying the indicator may include a method corresponding to that described in the above embodiment. More specifically, a bit indicating whether to directly change is included in a channel transmitted in the uplink, a CRC masking may be applied differently, or a scrambling code may be applied differently to indicate whether to change the beam.

In step 1420, the base station 1402 can perform the beam change on the subframe n + k based on the information received in step 1415 since the beam change identifier is on in the information received in step 1415. [ In another embodiment, if the base station is better than a threshold value in order to control beam modification relative to the beam currently in use, at least one of the BRSRP and BRRS-RP of the corresponding beam, based on the received beam information, You can make changes. The k value can be determined using the methods described previously. A threshold value for controlling the beam change will be described later. In step 1425, the UE 1401 may perform beam modification on the subframe n + k based on the information transmitted in step 1410. [ The beam change of the terminal 1401 can also determine whether to change the beam based on the threshold value. In the embodiment, the beam change can be performed simultaneously in the base station and the terminal in the corresponding subframe. However, the present invention is not limited thereto, and the beam change can be performed so that signals can be transmitted and received in the changed subframe in a subsequent subframe including the subframe n + have.

In step 1430, the base station 1402 can send a signal to the terminal 1401 with the changed beam, and the terminal 1401 can receive the signal with the changed beam.

In step 1430, the terminal 1401 can receive the signal with the changed beam, and more specifically, can perform the beam change to the beam reported in step 1415 in the subsequent subframe including the subframe n + k.

15 is a diagram illustrating a beam control method based on a beam control identifier included in a beam information report message according to another embodiment of the present invention.

Referring to FIG. 15, the terminal 1501 can transmit / receive a signal to / from the base station 1502.

In step 1510, the base station 1502 can transmit information requesting one of BSI and BRI to the terminal 1501, and the information can be transmitted to the terminal through the DCI.

In step 1515, the UE 1301 may transmit at least one of BSI and BRI to the base station 1302 through at least one of xPUCCH and xPUSCH in subframe n. In an embodiment, at least one of the xPUCCH and xPUSCH may be indicated via the DCI. The beam information reported in the embodiment may include at least one beam information and may be sequentially reported from the highest quality beam. The indicator may be turned off to instruct beam change in the embodiment.

In step 1520, the terminal 1501 and the base station 1502 may not change at least one of the transmission beam and the reception beam since the identifier indicating whether to change the beam included in step 1515 is off. Further, an additional beam changing procedure may be performed by base station control according to an embodiment.

In this manner, the base station 1502 may report the beam-related information to the terminal 1301, and may not perform beam-changing based on the determination of the terminal 1501. [

In addition, in the embodiment, the terminal may transmit identification information indicating whether to change the beam to the base station, and transmit the acknowledgment signal to the base station.

16 is a diagram illustrating a beam control method based on a beam control identifier included in a beam information report message according to an embodiment of the present invention.

Referring to FIG. 16, the terminal 1601 can transmit / receive a signal to / from the base station 1602.

In step 1610, the base station 1602 can transmit information requesting one of BSI and BRI to the terminal 1601, and the information can be transmitted to the terminal through the DCI.

In step 1615, the terminal 1601 may transmit at least one of BSI and BRI to the base station 1602 through at least one of xPUCCH and xPUSCH in subframe n. In an embodiment, at least one of the xPUCCH and xPUSCH may be indicated via the DCI. The beam information reported in the embodiment may include at least one beam information and may be sequentially reported from the highest quality beam. Also, an identifier indicating whether to change the beam together with at least one of the BSI and the BRI may be included and may be transmitted to the base station 1602. In the embodiment, the indicator may be turned on to instruct beam change.

In step 1620, the base station 1602 may transmit to the terminal 1601 a signal including an acknowledgment corresponding to the beam change indicator in the subframe n. In the embodiment, if a response corresponding to the identification information transmitted in step 1615 is not transmitted from the base station 1602 or a negative acknowledgment (NACK) is transmitted, the mobile station may not perform the beam change in the following operation. In this manner, the base station 1602 may receive the beam change request information from the terminal but may not perform the beam change by transmitting the NACK.

In step 1625, when an acknowledgment (ACK) is transmitted in the subframe n previously, the base station 1602 can change the base station beam based on the information received in step 1615. More specifically, it is possible to transmit a signal from the subframe transmitted after a predetermined time (after the k subframe in the embodiment) to the modified beam after transmitting the acknowledgment. Also, in step 1630, the UE 1601 may perform beam modification on the subframe n + k based on the information transmitted in step 1615. [ In the embodiment, the beam change can be performed simultaneously in the base station and the terminal in the corresponding subframe. However, the present invention is not limited thereto, and the beam change can be performed so that signals can be transmitted and received in the changed subframe in a subsequent subframe including the subframe n + have.

In step 1635, the base station 1602 can transmit a signal to the terminal 1601 based on the changed beam in the subframe n + k. The k value can be determined using the methods described previously.

17 is a diagram illustrating a beam control method using an acknowledgment message based on a beam control identifier included in a beam information report message according to another embodiment of the present invention.

Referring to FIG. 17, the terminal 1701 can transmit / receive a signal to / from the base station 1702.

In step 1710, the base station 1702 can transmit information requesting one of BSI and BRI to the terminal 1701, and the information can be transmitted to the terminal through the DCI.

In step 1715, the terminal 1701 may transmit at least one of BSI and BRI to the base station 1702 through at least one of xPUCCH and xPUSCH in subframe n. In an embodiment, at least one of the xPUCCH and xPUSCH may be indicated via the DCI. The beam information reported in the embodiment may include at least one beam information and may be sequentially reported from the highest quality beam. Also, an identifier indicating whether to change the beam together with at least one of the BSI and the BRI may be included and transmitted to the base station 1702. The indicator may be turned off to instruct beam change in the embodiment.

In step 1720, the base station 1702 may transmit to the terminal 1701 a signal including an acknowledgment corresponding to the beam change indicator in subframe n. In the embodiment, if a response corresponding to the identification information transmitted in step 1715 is not transmitted from the base station 1702, the beam change may not be performed in the following operation. The base station 1702 may also perform a beam change by transmitting a NACK corresponding to the information.

In step 1725, when the ACK is transmitted in the subframe n previously, the base station 1702 and the terminal 1701 may not perform the beam change. However, in such a case, the beam change may be performed by the additional information transmitted by the base station in step 1720. [

In the embodiments of FIGS. 12 to 17, the base station makes a beam change determination based on the received BSI / BRI information, and can transmit information indicating the beam change to the terminal. In the embodiment, this operation can be performed irrespective of whether the beam change identifier transmitted by the terminal is on or off.

With respect to the method of instructing the beam change, the following operation of the base station and the terminal is possible.

In the embodiment, when there are at least two beam-related reference signals, only the beam corresponding to the specific reference signal can be subjected to the beam changing method described with reference to Figs. 12 to 17 above. In one embodiment, the method may be applied to a reference signal that is periodic or cell specific. In another embodiment, the method may not be applied to reference signals that are aperiodic or UE specific. Also, the relevant reference signal applying the method according to the embodiment can be changed and applied.

In addition to the beam changing method proposed in the embodiment, other beam changing methods can be simultaneously operated in the system. Uncertainty of the beam change may occur when different beam changing methods are mixed, and in such a case, the uncertainty can be eliminated by utilizing the OFF mode in the base station or terminal beam control.

Also, in the embodiment, when the base station control and the terminal control operate together, it may be considered that the base station control is turned off and the identification information on the beam change is turned off according to an environment suitable for the terminal control. More specifically, when the base station control and the terminal control are mixed with respect to the beam change, the uncertainty in the beam change can be eliminated through the priority order. The following shows an embodiment thereof.

- The base station control takes precedence, and when the beam change is OFF in the terminal control, the terminal control can take precedence over the base station control.

- Base station control takes priority and terminal control can be given priority over base station control when beam change is ON in terminal control.

- Terminal control takes precedence, and when beam change is OFF in base station control, base station control can take precedence over terminal control.

- Terminal control takes precedence, and when beam change is ON in base station control, base station control can take precedence over terminal control.

Also, in the embodiment, when the UE reports beam information to the BS, the BS selects the beam information to be reported by the MS based on the best BRSRP / BRRS-RP, and transmits the selected information to the BS. Beam change can be performed with the beam corresponding to BRSRP / BRRS-RP. There is a possibility that frequent beam changes may occur even when there is no large gain compared to the beam being used for the current service when the beam change is performed with the optimum beam at the time of beam change. In order to control unnecessary beam change, a threshold value may be applied and it may be determined whether beam change is performed based on the threshold value.

In the embodiment, when the number of beams reported to the base station by the terminal is one, the following procedure is possible.

It is possible to report the optimal beam measured by the UE when the difference between the currently used beam for signal transmission and reception by the UE and the BS and the BRSRP / BRRS-RP difference of the optimal beam measured by the UE exceeds a specific threshold. Also, if the difference between the currently used beam for signal transmission and reception by the terminal and the base station and the BRSRP / BRRS-RP difference of the optimal beam measured by the terminal is below a specific threshold, the terminal can report the currently used beam information. Also, in the embodiment, when the beam change indicator is off, the UE can report beam information having a BRSRP / BRRS-RP equal to or less than a threshold value to the BS. Also, the terminal may report an optimal beam that has always been measured, and may determine based on the threshold value when the base station determines whether to apply beam change or not.

When the UE reports the threshold-based beam information in the above manner, the base station knows that a better beam than the current service beam has been uploaded. Therefore, the beam change is performed on the corresponding beam, Beam changes can be avoided.

In the embodiment, when the number of beams reported to the base station by the terminal is two or more, the following procedure is available.

When the terminal reports beam-related information to the base station, the base station / terminal operation for one beam is operated in the same manner as N = 1 case (that is, the beam applying the threshold). For the remaining N-1 beams May select the best BRSRP / BRRS-RP based beam among the remaining beams except the one beam.

Also, when more than one beam is applied to the threshold, the BS / UE can select the optimal BRSRP / BRRS-RP reference beam among the beams satisfying the threshold condition, and for the remaining Nx beams, The best BRSRP / BRRS-RP based beam among the remaining beams can be selected.

It may also be possible to perform an optimal BRSRP / BRRS-RP based beam selection if the beam satisfying the threshold condition is smaller than x in the embodiment.

In this way, if the UE reports optimal beam related information to the base station and the beam change indication is on, the terminal performs beam change to the optimal beam among the beams to which the threshold condition is applied to avoid frequent beam changes. In case of applying a terminal beam, the beam can be changed to a beam corresponding to the base station beam.

18 is a view for explaining a beam changing method based on a threshold value according to an embodiment of the present invention.

Referring to FIG. 18, a process of selecting a beam to be reported to a base station by a terminal in a reporting environment using a threshold condition may be illustrated. For convenience of explanation, it is assumed that two BRS beams are measured and one beam is selected. Case 1 indicates that beam is selected based on optimum BRSRP when threshold is set to 0. On the other hand, when the threshold value is set to 3 dB, beam 1 can be selected when the BRSRP is higher than 3 dB based on the BRSRP of the 0th beam used in the service.

19 is a view for explaining a beam changing method based on a threshold value according to another embodiment of the present invention.

Referring to FIG. 19, a process of selecting a beam reported by a terminal to a base station in a reporting environment using a threshold condition may be illustrated. Threshold value in the embodiment may be 3 dB, but this can be changed. In the embodiment, when the beam change instruction information is ON, as shown in the first diagram, after the # 0 beam is reported, if the threshold condition is not satisfied, the # 0 beam is reported even though the # 1 beam has higher BRSRP, There may be no beam change at the base station. Also, in the second case, when the # 1 beam satisfies the threshold condition, the # 1 beam is reported, and the base station beam is changed to # 1 from a specific point of time and converted into the corresponding terminal beam so that signals can be transmitted and received between the base station and the terminal.

20 is a view for explaining a beam changing method based on a threshold value according to another embodiment of the present invention.

Referring to FIG. 20, a process of selecting a beam to be reported to a base station by a terminal in a reporting environment using a threshold condition may be illustrated. Threshold value in the embodiment may be 3 dB, but this can be changed. In this embodiment, the beam change is not performed irrespective of the beam information reported when the beam change instruction information is off. At this time, the beam information can be reported by applying the threshold condition, or the beam information can be reported using the optimal Beam information to the base station.

In the embodiment, the condition related to the threshold value may be operable in the following manner.

- The base station drops the threshold value to the UE (ie RRC signaling or DCI or MAC-CE.)

- Determine N beam information based on optimal BRSRP or BRRS-RP in the terminal and perform transmission

- When the optimal beam among the reported beams satisfies a certain threshold condition, it is reported at subframe n.

It may also indicate only a beam change for some channels when instructing the beam change in the embodiment. More specifically, different beams may be applied to distinguish the uplink and the downlink, and different beams may be applied to the data channel and the control channel in the same uplink or downlink. In addition, specific channels may be grouped and beam-based on this.

Examples of such groupings may be applied to one or more of the following.

- A method of instructing a beam change to a specific physical (physical, PHY) channel: When a specific channel is indicated, a method of applying a beam change only to the corresponding channel

- UL channel / DL channel / beam switching method for all channels: All the UL related channels or all UL related channels or UL / DL all channels to transmit the indication information for selective beam change. How to apply beam changes only to

- A method of grouping all PHY channels and signals into a specific group of channels and instructing the beam change for that group: Grouping PHY channels in other ways than UL / DL, and changing the beam for that group By changing the beam of channels or signals belonging to the group by instructing it,

Also, in the case of such a grouping, it is possible to apply selective beam changing by grouping and combining various methods, not limited to the above example. In the selective beam changing scheme, control of the beam change for a specific group is possible by control of at least one of the base station and the terminal.

The following method can be used to transmit information related to such selective beam change.

- Specific bit-based indication method included in BSI / BRI request DCI

- BSI / BRI Request Indication using different CRC masking in DCI transmission

- Indication method applying different scrambling sequence in BSI / BRI request DCI transmission

- Semi-static indication based on upper layer signal including RRC

- In some combinations and all combinations of the above four schemes,

Indication bits Indicated Channels 00 PUCCH, PUSCH 01 PDCCH, PDSCH 10 SRS, PUCCH, PUSCH 11 CSI-RS, PDCCH, PDSCH

Table 8 shows an example of a specific bit-based indication method included in the BSI / BRI request DCI. When the UE receives such information, the transmitting and receiving beam related to the PUCCH and PUSCH can be changed based on the beam information to be reported when the indicator bit is '00'. Based on the beam information to be reported in case of '01' 0.0 > PDCCH < / RTI > and the PDSCH.

CRC  mask Indicated Channels 0000000000000000 PUCCH, PUSCH 1111111111111111 PDCCH, PDSCH 0101010101010101 SRS, PUCCH, PUSCH 1010101010101010 CSI-RS, PDCCH, PDSCH

Table 9 is a table showing an example of a method of applying different CRC masking when transmitting BSI / BRI request DCI. Different CRC masking can be used to indicate the channel on which the beam information changes.

Scrambling seq . Indicated Channels a (i), i = 0, ... ., # of data symbol PUCCH, PUSCH b (i), i = 0, ... ., # of data symbol PDCCH, PDSCH c (i), i = 0, ... ., # of data symbol SRS, PUCCH, PUSCH d (i), i = 0, ... ., # of data symbol CSI-RS, PDCCH, PDSCH

Table 10 shows an example of an indication method in which different scrambling sequences are applied to BSI / BRI request DCI transmission. By applying different scrambling sequences, it is possible to indicate the channel on which the beam information changes.

Indication bits Indicated UL Channels Indicated DL Channels 00 PUCCH PDCCH 01 PUSCH PDSCH 10 PUCCH, PUSCH PDCCH, PDSCH 11 SRS, PUCCH, PUSCH CSI-RS, PDCCH, PDSCH

Table 11 shows that beam changes of different channels of the uplink channel and the downlink channel are instructed based on the same indication bit.

More specifically, the indication of the UL channel beam change may be transmitted to the UE through the UL DCI, and the indication of the DL channel beam change may be transmitted to the UE via the DL DCI. And may be semi-static to the UE through an upper layer signal such as RRC according to an embodiment.

Thus, the beam changing procedure including the method of Tables 8 to 11 may proceed as follows.

- if the indicated channels by base station and terminal control are different,

- The base station can distinguish between the beam change control channel and the beam change control channel.

: As an example, an instruction for selective beam change for a DL channel can be operated only in a base station control, and an instruction for selective beam changing for a UL channel can be operated in a terminal control only. It can be classified into specific groups other than DL / UL standards. In the case of the embodiment of Table 11, as an embodiment at the time of simultaneous UL / DL base station / terminal control operation, the indication for the UL and the indication information for the DL are separately operated to limit the instruction for the selective beam change of the terminal to the UL channel, An example for operation limiting the indication for the selective beam change of the base station to the DL channel is shown.

In addition, there is no restriction on the channel capable of beam change control of the base station / terminal, but the beam change control for a specific channel may be prioritized to control the base station or the terminal. As an example of this, if the selective beam change for the UL channel is prioritized to the terminal control for the indication, the selective beam change for the DL channel is given priority over the indication of the base station control.

21 is a diagram illustrating a selective beam changing method according to an embodiment of the present invention.

Referring to FIG. 21, a terminal 2101 can transmit / receive a signal to / from a base station 2102.

In step 2110, the base station 2102 may transmit information requesting one of BSI and BRI to the terminal 2101, and the information may be transmitted to the terminal through the DCI. In an embodiment, the DCI may include at least one of information indicating whether a beam change is requested and information indicating a group to which the changed beam is to be applied. In the embodiment, whether to request the beam change is indicated as on, Can be transmitted as indicated by " 01 ". A method for indicating whether or not to request beam change more specifically will be described later.

In step 2115, the UE 2101 may transmit at least one of BSI and BRI to the BS 2102 through at least one of xPUCCH and xPUSCH in subframe n. In an embodiment, at least one of the xPUCCH and xPUSCH may be indicated via the DCI. The beam information reported in the embodiment may include at least one beam information and may be sequentially reported from the highest quality beam.

In step 2120, the base station 2102 determines that the beam change identifier is on in the DCI transmitted in step 2110, and that the corresponding channel is a PDCCH and a PDSCH based on Table 8. Based on the information received in step 1215, lt; RTI ID = 0.0 > PDCCH < / RTI > In another embodiment, if the base station is better than a threshold value in order to control beam modification relative to the beam currently in use, at least one of the BRSRP and BRRS-RP of the corresponding beam, based on the received beam information, You can make changes. The k value can be determined using the methods described previously. A threshold value for controlling the beam change may be determined according to the method described in the embodiment. In step 2125, the terminal 2101 performs a beam change on the subframe n + k based on the information transmitted in step 2115. [ Can be performed. The beam change of the terminal 2101 can also determine whether to change the beam based on the threshold value. In the embodiment, the beam change can be performed simultaneously in the base station and the terminal in the corresponding subframe. However, the present invention is not limited thereto, and the beam change can be performed so that signals can be transmitted and received in the changed subframe in a subsequent subframe including the subframe n + have.

In step 2130, the base station 2102 may transmit a signal including the PDCCH and PDSCH to the terminal 2101 with the changed beam. Also, the terminal 2101 can receive a signal including a PDCCH and a PDSCH from the base station 2102 with a changed beam.

In step 2130, the UE 2101 may receive a signal with the changed beam, and more specifically, may perform beam modification to the beam reported in step 2115 in a subsequent subframe including the subframe n + k.

In the case of an unspecified channel, it is possible to transmit and receive a signal by holding a beam that has been used previously.

Also, if there is a transmission error of the information related to the beam change in the first half of the embodiment, the following operation can be performed.

- If the BSI / BRI request information sent by the base station is missing

In an exemplary embodiment, if a signal is not received from the terminal at the time the base station receives the report from the terminal according to the BSI / BRI request, the base station may retransmit the BSI / BRI request information to the terminal, And determines the subframe n when the corresponding BSI / BRI receives the report, and performs the beam change based on the determination.

- If the BSI / BRI request is known incorrectly (false alarm case)

If a BSI / BRI report that the base station did not request from the terminal is received, the base station may send the DCI containing the BSI / BRI request before the beam change time point (in the example before the k subframe). The terminal receiving the DCI may operate to ignore the previous message for beam modification. In another embodiment, the base station may transmit the beam change request indication information to the DCI by setting the beam change request indication information to off when the beam change is unnecessary. Also, when beam change is required, the beam change request indication information can be set to on and transmitted.

- If the BSI / BRI reporting information sent by the terminal is missing

In an embodiment, if a report of a BSI / BRI request transmitted by a base station is not received at the base station at a predetermined time, the base station can retransmit the BSI / BRI request. When a BSI / BRI request is retransmitted, the time when the BSI / BRI is reported based on the retransmission time is reset to the subframe n. In addition, such error handling cases can be similarly applied throughout the automatic beam changing method.

22 is a diagram illustrating a terminal according to an embodiment of the present invention.

Referring to FIG. 22, the terminal 2200 of the embodiment includes a transmission / reception unit 2202, a storage unit 2204, and a control unit 2206.

The transmission / reception unit 2202 can transmit and receive signals to / from the base station.

The storage unit 2204 may store at least one of information related to the terminal 2200 and information transmitted / received through the transmission / reception unit 2202.

The control unit 2206 may control the operation of the terminal 2200 and may control the entire terminal so as to perform operations related to the terminal described in the embodiment. The control unit 2206 may include at least one processor.

23 is a diagram illustrating a base station according to an embodiment of the present invention.

Referring to FIG. 23, the base station 2300 of the embodiment includes a transmission / reception unit 2302, a storage unit 2304, and a control unit 2306.

The transceiver 2302 can transmit and receive signals to and from a terminal and other network entities.

The storage unit 2304 may store at least one of information related to the base station 2300 and information transmitted / received through the transmission / reception unit 2302.

The control unit 2306 can control the operation of the base station 2300 and can control the entire base station to perform operations related to the base station described in the embodiment. The control unit 2306 may include at least one processor.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And is not intended to limit the scope of the invention. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

Claims (20)

A method of transmitting and receiving signals in a terminal of a mobile communication system,
The method comprising: receiving first information from a base station, the first information including a request for information related to a beam;
Transmitting second information including information related to the beam to the base station based on the first information; And
And modifying at least one of a transmission beam and a reception beam associated with the base station based on the first information and the second information. The method according to claim 1,
Wherein the first information includes information indicating whether or not to change the beam of the terminal,
Wherein changing at least one of a transmit beam and a receive beam associated with the base station
And changing at least one of a transmission beam and a reception beam associated with the base station based on the first information and the second information when the beam change indication information indicates a beam change. The method according to claim 1,
Wherein the second information includes information indicating whether or not to change the beam of the base station,
Wherein changing at least one of a transmit beam and a receive beam associated with the base station
And changing at least one of a transmission beam and a reception beam associated with the base station based on the first information and the second information when the beam change indication information indicates a beam change, Way. The method according to claim 1,
Wherein changing at least one of a transmit beam and a receive beam associated with the base station
Receiving a response to the second information in a first subframe from the base station; And
Modifying at least one of a transmit beam and a receive beam associated with the base station based on the first information and the second information in the second sub-frame,
Wherein the information about the relationship between the first sub-frame and the second sub-frame is received from the base station through the first information or a separate message. The method according to claim 1,
Wherein the first information includes third information indicating a channel associated with a beam change,
Wherein changing at least one of a transmit beam and a receive beam associated with the base station
And changing a beam corresponding to a channel determined based on the third information to a beam determined according to the first information and the second information. A method of transmitting and receiving signals in a base station of a mobile communication system,
Transmitting first information including a request for information related to a beam to a terminal;
Receiving second information from the terminal, the second information including information related to the beam based on the first information; And
And modifying at least one of a transmission beam and a reception beam associated with the terminal based on the first information and the second information. The method according to claim 6,
Wherein the first information includes information indicating whether or not to change the beam of the base station,
Wherein changing at least one of a transmit beam and a receive beam associated with the terminal
And changing at least one of a transmission beam and a reception beam associated with the terminal based on the first information and the second information when the beam change indication information indicates a beam change. The method according to claim 6,
Wherein the second information includes information indicating whether or not to change the beam of the terminal,
Wherein changing at least one of a transmit beam and a receive beam associated with the terminal
And changing at least one of a transmission beam and a reception beam associated with the terminal based on the first information and the second information when the beam change indication information indicates a beam change, Way. The method according to claim 6,
Wherein changing at least one of a transmit beam and a receive beam associated with the terminal
Transmitting a response to the second information to the terminal in a first subframe; And
And modifying at least one of a transmission beam and a reception beam associated with the terminal based on the first information and the second information in the second subframe,
Wherein the information about the relationship between the first subframe and the second subframe is transmitted to the terminal through the first information or a separate message. The method according to claim 6,
Wherein the first information includes third information indicating a channel associated with a beam change,
Wherein changing at least one of a transmit beam and a receive beam associated with the terminal
And changing a beam corresponding to a channel determined based on the third information to a beam determined according to the first information and the second information. A terminal of a mobile communication system,
A transmitting and receiving unit for transmitting and receiving signals; And
Receiving the first information including an information request related to the beam from the base station and transmitting second information including information related to the beam based on the first information to the base station, And a controller for changing at least one of a transmission beam and a reception beam associated with the base station based on the information and the second information. 12. The method of claim 11,
Wherein the first information includes information indicating whether or not to change the beam of the terminal,
The control unit
And changes at least one of a transmission beam and a reception beam associated with the base station based on the first information and the second information when the beam change indication information indicates a beam change. 12. The method of claim 11,
Wherein the second information includes information indicating whether or not to change the beam of the base station,
The control unit
And changes at least one of a transmission beam and a reception beam associated with the base station based on the first information and the second information when the beam change indication information indicates a beam change. 12. The method of claim 11,
The control unit
Receiving a response to the second information in the first subframe from the base station,
Modifying at least one of a transmit beam and a receive beam associated with the base station based on the first information and the second information in the second sub-
Wherein the information about the relationship between the first sub-frame and the second sub-frame is received from the base station through the first information or a separate message. 12. The method of claim 11,
Wherein the first information includes third information indicating a channel associated with a beam change,
The control unit
And changes a beam corresponding to a channel determined based on the third information to a beam determined according to the first information and the second information. A base station of a mobile communication system,
A transmitting and receiving unit for transmitting and receiving signals; And
Receiving a first information including an information request related to a beam to the terminal, receiving second information from the terminal, the second information including information related to the beam based on the first information, And a controller for changing at least one of a transmission beam and a reception beam associated with the terminal based on the information and the second information. 17. The method of claim 16,
Wherein the first information includes information indicating whether or not to change the beam of the base station,
The control unit
And changes at least one of a transmission beam and a reception beam associated with the terminal based on the first information and the second information when the beam change indication information indicates a beam change. 17. The method of claim 16,
Wherein the second information includes information indicating whether or not to change the beam of the terminal,
The control unit
And changing at least one of a transmission beam and a reception beam associated with the terminal based on the first information and the second information when the beam change indication information indicates a beam change. 17. The method of claim 16,
The control unit
Transmitting a response to the second information to the terminal in a first subframe,
Modifying at least one of a transmission beam and a reception beam associated with the terminal based on the first information and the second information in the second sub-frame,
Wherein the information about the relationship between the first subframe and the second subframe is transmitted to the terminal through the first information or a separate message. 17. The method of claim 16,
Wherein the first information includes third information indicating a channel associated with a beam change,
The control unit
And changes a beam corresponding to a channel determined based on the third information to a beam determined according to the first information and the second information.

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