KR20130043078A - Apparatus and method for controlling uplink in wireless communication system - Google Patents

Apparatus and method for controlling uplink in wireless communication system Download PDF

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Publication number
KR20130043078A
KR20130043078A KR1020120116788A KR20120116788A KR20130043078A KR 20130043078 A KR20130043078 A KR 20130043078A KR 1020120116788 A KR1020120116788 A KR 1020120116788A KR 20120116788 A KR20120116788 A KR 20120116788A KR 20130043078 A KR20130043078 A KR 20130043078A
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KR
South Korea
Prior art keywords
transmission
uplink
reception
path loss
beams
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KR1020120116788A
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Korean (ko)
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KR102016685B1 (en
Inventor
정정수
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삼성전자주식회사
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Priority to CN201280051481.8A priority Critical patent/CN103891161B/en
Priority to US13/655,813 priority patent/US9215650B2/en
Priority to PCT/KR2012/008625 priority patent/WO2013058612A1/en
Publication of KR20130043078A publication Critical patent/KR20130043078A/en
Application granted granted Critical
Publication of KR102016685B1 publication Critical patent/KR102016685B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03891—Spatial equalizers
    • H04L25/03949—Spatial equalizers equalizer selection or adaptation based on feedback
    • H04L25/03955—Spatial equalizers equalizer selection or adaptation based on feedback in combination with downlink estimations, e.g. downlink path losses

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE: An uplink control method and a device thereof are provided to allow a terminal to select an uplink transmission beam for executing a random access process in a wireless communication system for supporting a beam forming process. CONSTITUTION: A control unit(1000) receives a downlink reference signal from a plurality of transmission beams in a base station through a plurality of reception beams including different directivity. The control unit measures path loss based on reception signal strength for a plurality of downlink reference signals received through different transmission and reception beams. The control unit selects the transmission beam of a terminal for uplink based on a path loss value measured from the plurality of the downlink reference signals. The control unit transmits an uplink signal by using the selected transmission beam. [Reference numerals] (1000) Control unit; (1002) Uplink control unit; (1010) Modem; (1020) RF chain; (1030) Beam forming unit; (1040) Storage unit;

Description

Method and device for uplink control in wireless communication system {APPARATUS AND METHOD FOR CONTROLLING UPLINK IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to an uplink control method and apparatus in a wireless communication system, and more particularly, to an uplink control method and apparatus for accessing a base station of a terminal in a wireless communication system supporting beamforming.

The average amount of data used by mobile subscribers is growing exponentially, and users are demanding higher data rates. Accordingly, in recent years, a research for introducing a communication technology, that is, a millimeter wave system in an ultra-high frequency band of 30 Ghz or more, has been conducted as a method for providing a high data rate.

In the millimeter wave system, the propagation path loss is seriously generated, which significantly reduces the coverage of the base station. Accordingly, in order to solve the propagation path loss problem in the millimeter wave system, it is expected that a beam forming technique for concentrating transmit / receive power in a narrow space to increase the transmit / receive efficiency of the antenna will be introduced.

1 illustrates a wireless communication system supporting beamforming. Referring to FIG. 1, the base station 100 and the terminal 102 may transmit and receive data using a plurality of transmit and receive beams having different directions. Accordingly, in the beamforming supporting system, the base station 100 and the terminal 102 transmit and receive beam training signals through the plurality of transmit and receive beams having different directions to select an optimal beam. Do this. That is, the base station 100 and the terminal 102 perform beam sweeping to transmit and receive beam training signals for all beam directions that can be transmitted and received, and measure the reception quality of the beam training signals to optimal channel. Select the transmit beam and receive beam with environment. In a system supporting the beamforming, a beam sweeping operation is performed in a process of establishing a communication channel between a base station and a terminal to start communication. For example, the transmission beam direction used when the terminal initially performs a random access process is also transmitted a plurality of times in a plurality of directions using a beam sweeping operation.

2A and 2B illustrate a downlink beam training process using a downlink reference signal as a beam training signal and an uplink beam training process using an uplink random access signal in a beamforming supporting wireless communication system. Here, the case of four transmission and reception beams of the base station 100 and the terminal 102 are shown as an example. First, as shown in FIG. 2A, the base station 100 uses the four transmission beams BS_TX1, BS_TX2, BS_TX3, BS_TX4 to transmit a beam training signal, that is, a reference signal, to set up a downlink channel. 4 times transmission (4x transmission), and the terminal 102 receives 4 times the reference signal transmitted from the 4 transmission beams by using 4 reception beams MS_RX1, MS_RX2, MS_RX3, and MS_RX4. Receive x times). Thereafter, the terminal 102 selects a transmission beam of the base station 100 and a reception beam of the terminal 102 corresponding to the reference signal having the best reception quality. This beam training process is performed in the same manner to determine the uplink transmission beam and the reception beam as shown in FIG. 2B. That is, as illustrated in FIG. 2B, the terminal 102 uses four transmission beams MS_TX1, MS_TX2, MS_TX3, and MS_TX4 to beam beam training signals, that is, random access signals four times, to set uplink channels. Transmit (4 × times), the base station 100 receives the random access signal transmitted from the 4 transmit beams 4 times (4 × times) using each of the 4 receive beams BS_RX1, BS_RX2, BS_RX3, and BS_RX4. Receive). Thereafter, the base station 100 selects a transmission beam of the terminal 102 and a reception beam of the base station 100 according to the reception quality of the random access signal.

As described above, in the beamforming technique according to the prior art, the terminal and the base station should perform beam sweeping for transmitting and receiving signals for all possible transmission and reception beam directions for the uplink transmission / reception beam and the downlink transmission / reception beam. However, the method of transmitting and receiving signals for all transmission and reception beams by each of the terminal and the base station has an inefficient disadvantage in terms of energy efficiency or interference between terminals. Accordingly, a more efficient beam training method needs to be provided in a wireless communication system supporting beamforming, and an uplink random access process transmitted using a beam sweeping operation needs to be efficiently designed.

In addition, in the millimeter wave system, a technique for efficiently setting power for a random access signal needs to be proposed in order for the terminal to overcome path loss. In the conventional system, the terminal measures the path loss by using a difference between the reference signal transmission strength of the base station and the reference signal reception strength of the terminal, and determines the transmission power based on the measured path loss. However, since the conventional technique is based on a system using an omni antenna, it is difficult to apply to a beamforming system in which different path loss occurs depending on the transmission / reception beam direction.

An embodiment of the present invention is to provide a method and apparatus for controlling uplink in a wireless communication system supporting beamforming.

Another embodiment of the present invention provides a method and apparatus for selecting a uplink transmission beam by a terminal to perform a random access procedure in a wireless communication system supporting beamforming.

Another embodiment of the present invention provides a method and apparatus for determining, by the terminal, uplink transmission power in order to perform a random access procedure in a wireless communication system supporting beamforming.

According to another embodiment of the present invention, in a wireless communication system supporting beamforming, a transmission / reception beam for uplink signal transmission is selected based on path loss of downlink signals in different transmission / reception beam directions, and A method and apparatus for determining transmit power are provided.

According to an embodiment of the present invention, a method of a terminal for uplink control in a wireless communication system supporting beamforming refers to downlink from a plurality of transmission beams of a base station using a plurality of reception beams having different directions. A process of receiving a signal, measuring a path loss for each of a plurality of downlink reference signals received through different transmission and reception beams, and an uplink based on the measured path loss value for each of the plurality of downlink reference signals And selecting a transmission beam of the terminal for the link, and transmitting an uplink signal using the selected transmission beam.

According to an embodiment of the present invention, a method of a base station for uplink control in a wireless communication system supporting beamforming refers to downlinks for a plurality of receive beams of a terminal using a plurality of transmit beams having different directions. And transmitting a signal and receiving an uplink signal from a transmission beam selected by the terminal based on a path loss among different transmission and reception beams formed between the base station and the terminal.

According to an embodiment of the present invention, in a wireless communication system supporting beamforming, an apparatus of a terminal for uplink control may include a beamformer forming a plurality of beams having different directions and a beamformer configured to control each other. Receive downlink reference signals from multiple transmit beams of the base station through multiple receive beams having different directionalities, measure path loss for each of the multiple downlink reference signals received through different transmit and receive beams, And a control unit for selecting a transmission beam of the terminal for uplink based on the measured path loss value for each downlink reference signal of the control unit and controlling a function for transmitting an uplink signal using the selected transmission beam. It is characterized by.

According to an embodiment of the present invention, an apparatus of a base station for uplink control in a wireless communication system supporting beamforming includes a beamforming unit forming a plurality of beams having different directions and a beamforming unit to control each other. Downlink reference signals for a plurality of receive beams of a terminal are transmitted through a plurality of transmit beams having different directionalities, and among the different transmit / receive beams formed between the base station and the terminal, uplink from a transmit beam selected by the terminal based on path loss. A control unit for controlling a function for receiving a link signal is characterized in that it comprises a.

The present invention determines an uplink transmission beam and a transmission power of a terminal based on downlink path loss for different transmission and reception beam directions in a wireless communication system supporting beamforming, and through the determined transmission beam with the determined transmission power. By transmitting the uplink random access signal, it is possible to reduce energy consumption according to the random access procedure, and there is an effect of improving the success probability for the random access signal transmission.

1 illustrates a wireless communication system supporting beamforming;
2A and 2B illustrate uplink beam training using downlink beam training and random access operation in a wireless communication system supporting beamforming;
3 is a diagram illustrating a frame structure of a wireless communication system supporting beamforming;
4 illustrates a downlink beam training signal in a wireless communication system supporting beamforming according to the present invention;
5A and 5B are diagrams illustrating reception strength of a downlink beam training signal in a wireless communication system supporting beamforming according to the present invention;
6A through 6F illustrate uplink transmission beams selected based on path loss of a beam training signal in a wireless communication system supporting beamforming according to an embodiment of the present invention;
7 is a diagram illustrating a procedure for a base station receiving uplink random access in a wireless communication system supporting beamforming according to an embodiment of the present invention;
8 illustrates an uplink random access procedure of a terminal in a wireless communication system supporting beamforming according to an embodiment of the present invention;
9 is a block diagram of a base station in a wireless communication system supporting beamforming according to an embodiment of the present invention; and
10 is a block diagram of a terminal in a wireless communication system supporting beamforming according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of related well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to intention or custom of a user or an operator. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, the present invention will be described with reference to a method and apparatus for selecting a transmission beam and determining a transmission power for uplink random access in a wireless communication system supporting beamforming. The following description is based on the assumption that downlink path loss and uplink path loss are the same for the same transmit / receive beam direction. Hereinafter, for convenience of description, it will be described assuming the same path loss for the downlink and uplink. However, the present invention can be applied in the same manner even when the path loss of the downlink and the path loss of the uplink are different.

3 illustrates a frame structure of a wireless communication system supporting beamforming.

Referring to FIG. 3, the frame 310 includes a plurality of subframes 320, and the subframe 320 includes a downlink (DL) section 332 and an uplink (UL). uplink) section 334. In FIG. 3, the downlink period 332 and the uplink period 334 are divided on a time axis. However, according to another embodiment of the present invention, the downlink period 332 and the uplink period 334 may be divided on the frequency axis. Here, a part of the downlink period 332 is defined as a synchronization / broadcast channel period 340. The synchronization / broadcast channel section 340 is a broadcast control channel for broadcasting control information to be transmitted over a sync channel section 300 for transmitting a downlink beam training signal and a coverage of the base station. It includes a BCH: Broadcast channel (302) section. In addition, a part of the uplink period 334 is defined as a random access channel period 350 for transmitting a random access signal, which is an uplink beam training signal.

In the present invention, the base station transmits a reference signal for beam training through a plurality of transmission beams having different directionality, as shown in FIG. 4 in the synchronization channel section of the downlink section 332, the broadcast Control information for uplink transmission power control is transmitted in a control channel section. Here, the control information includes a reference signal transmission power, an uplink target reception power, an uplink maximum transmission power, an uplink transmission power adjustment value, and a response waiting time of the base station. In addition, in the present invention, as shown in Figure 5, the terminal receives a reference signal transmitted from the base station through a plurality of receive beams having different directionality, based on the received strength of the reference signal for each transmit and receive beam After the path loss is measured, the transmission beam of the terminal for random access is selected based on the measured path loss and the control information, and transmission power of the selected transmission beam is determined. Thereafter, the terminal transmits a random access signal having the determined transmission power through a random access time point corresponding to the selected transmission beam in the random access channel section of FIG. 3.

4 illustrates a beam training process using a downlink synchronization channel in a wireless communication system supporting beamforming according to the present invention. In the following description, it is assumed that there are 6 transmit / receive beams of a base station and 4 transmit / receive beams of a terminal.

Referring to FIG. 4, the base station 400 according to the present invention transmits a reference signal through each of six transmission beams BS_TX1, BS_TX2, BS_TX3, BS_TX4, BS_TX5, and BS_TX6 having different directions in the downlink synchronization channel section. Transmit 4 times. That is, the base station 400 transmits the reference signal four times through one transmission beam. This is to allow the terminal 402 to receive a reference signal transmitted from the one transmission beam through each of the four reception beams MS_RX1, MS_RX2, MS_RX3, and MS_RX4 having different directions. For example, the transmission beam BS_TX1 of the base station 400 repeatedly transmits one reference signal four times, and the terminal 402 transmits from the BS_TX1 while changing four reception beams MS_RX1, MS_RX2, MS_RX3, and MS_RX4. Receive one reference signal. In this case, the terminal 402 receives the reference signal one or more times for a specific time for one transmission beam and the reception beam pair, averages the signal strength of the received reference signal, and converts the value to the signal for the transmission / reception beam pair. Can be used as reception strength. The terminal may calculate an average reception strength of a reference signal received more than once during a specific time period to obtain a reception signal strength in which instantaneous channel fluctuations are excluded at every reference signal measurement time.

5A and 5B illustrate reception strengths of a downlink synchronization channel in a wireless communication system supporting beamforming according to the present invention. In particular, FIG. 5A illustrates an optimal reception beam of a terminal for each transmission beam of a base station according to an embodiment of the present invention, and FIG. 5B illustrates an optimal reception base station of each reception beam of a terminal according to another embodiment of the present invention. Represents a transmission beam.

In FIG. 5A, the beams indicated by ellipses in a dotted line form indicate an optimal reception beam of the terminal 402 for each transmission beam of the base station 400. For example, referring to the transmission beam BS_TX1 of the base station 400, the terminal 402 transmits four reference signals transmitted from the transmission beam BS_TX1 of the base station 400 to four reception beams MS_RX1, MS_RX2, MS_RX3, and MS_RX4. As a result, when the reception strength of the reference signal received through the reception beam MS_RX3 is the largest, the optimal reception beam of the terminal 402 with respect to the transmission beam BS_TX1 of the base station 400 becomes MS_RX3. That is, referring to FIG. 5A, the optimal reception beam of the terminal 402 for the transmission beam BS_TX1 of the base station 400 is MS_RX3, and the optimal reception of the terminal 402 for the transmission beam BS_TX2 of the base station 400. The beam is MS_RX2, the optimal receive beam of terminal 402 for transmit beam BS_TX3 of base station 400 is MS_RX4, and the optimal receive beam of terminal 402 for transmit beam BS_TX4 of base station 400 is MS_RX3. It can be seen that the optimal reception beam of the terminal 402 for the transmission beam BS_TX5 of the base station 400 is MS_RX1, and the optimal reception beam of the terminal 402 for the transmission beam BS_TX6 of the base station 400 is MS_RX4. . In addition, in the embodiment of FIG. 5A, when the terminal 402 receives the reference signal transmitted from the transmission beam BS_TX2 of the base station 400 through the reception beam MS_RX2, the reception strength of the reference signal is measured to be the largest. Assume that

In FIG. 5B, the beams indicated by ellipses in a dotted line form indicate an optimal transmission beam of the base station 400 for each reception beam of the terminal 402. For example, referring to the reception beam MS_RX1 of the terminal 402, the terminal 402 receives six reference signals transmitted from each of the transmission beams BS_TX1, BS_TX2, BS_TX3, BS_TX4, BS_TX5, and BS_TX6 of the base station 400. As a result of receiving through the beam MS_RX1, when the reception strength of the reference signal transmitted from the transmission beam BS_TX5 of the base station 400 is the largest, the optimal transmission beam for the reception beam MS_RX1 of the terminal 402 becomes BS_TX5. . That is, referring to FIG. 5B, the optimal transmission beam of the base station 400 for the reception beam MS_RX1 of the terminal 402 is BS_TX5, and the optimal transmission of the base station 400 for the reception beam MS_RX2 of the terminal 402. The beam is BS_TX2, the optimal transmission beam of the base station 400 for the reception beam MS_RX3 of the terminal 402 is BS_TX4, and the optimal transmission beam of the base station 400 for the reception beam MS_RX4 of the terminal 402 is BS_TX6. Able to know. In addition, in the embodiment illustrated in FIG. 5B, when the terminal 402 receives the reference signal transmitted from the transmission beam BS_TX2 of the base station 400 through the reception beam MS_RX2, the reception strength of the reference signal is measured to be the largest. Assume

In the following description, a technique of selecting a transmission beam and determining transmission power on the assumption that the signal strength as shown in FIGS. 5A and 5B is measured will be described. Here, the terminal calculates a path loss for each transmit / receive beam based on the received signal strength of the reference signal and control information received from the base station, and based on the path loss, transmits the transmit beam of the terminal for uplink. You can choose. At this time, the terminal checks the transmission power of the reference signal included in the control information, and calculates a path loss based on the difference between the transmission power of the reference signal and the reception strength of the reference signal.

A terminal according to the present invention can select a transmission beam using six methods, and the transmission beam selection method will be described with reference to FIGS. 6A to 6F.

The first method is a method in which the terminal identifies one transmit / receive beam having the lowest path loss among all transmit / receive beams for the base station, and selects a corresponding uplink transmit / receive beam. For example, as shown in FIG. 6A, when the reception intensity of the reference signal for the base station transmission beam BS_TX2 and the reception beam MS_RX2 of the terminal is measured to be the largest, the terminal receives the base station transmission beam BS_TX2 and the reception beam MS_RX2 of the terminal. The transmit / receive beams BS_RX2 and MS_TX2 corresponding to the corresponding signals are selected. In this case, as the terminal selects the transmission / reception beams BS_RX2: MS_TX2, the terminal does not transmit an uplink random access signal by the number of possible transmission / reception beams (number 24), but the reception beam BS_RX2 of the base station is transmitted to the transmission beam MS_TX2. Only transmit a random access signal. In this case, the terminal transmits a random access signal at a time point corresponding to the transmission beam MS_TX2 of the terminal and the reception beam BS_RX2 of the base station within the random access channel section.

In the second method, the terminal identifies the transmission beam of the base station corresponding to one transmission / reception beam having the lowest path loss among all transmission / reception beams for the base station, and the base station reception beam corresponding to the transmission beam of the base station This method selects all transmission beams. For example, as shown in FIG. 6B, when the reception strengths of the reference signals for the base station transmission beam BS_TX2 and the reception beam MS_RX2 of the terminal are measured the largest, the terminal receives the base station corresponding to the transmission beam BS_TX2 of the base station. All uplink transmit / receive beams to the beam BS_RX2 are selected (BS_RX2: MS_TX1, BS_RX2: MS_TX2, BS_RX2: MS_TX3, BS_RX2: MS_TX4). Here, the terminal transmits a random access signal to the base station reception beam BS_RX2 while changing its transmission beams MS_TX1, MS_TX2, MS_TX3, and MS_TX4 at a time point corresponding to the reception beam BS_RX2 of the base station within a random access channel section.

The third method is a method in which the terminal identifies the reception beam of the terminal having the lowest path loss for each transmission beam of the base station and selects corresponding uplink transmission / reception beams. That is, the third method is a method of transmitting a beam training signal by selecting a transmission beam of a terminal having optimal performance for each reception beam of the base station. For example, when the reception strength of the reference signal is measured as shown in FIG. 5A, the terminal receives the reception beams (BS_TX1: MS_RX3, BS_TX2: MS_RX2, BS_TX3: MS_RX4,) of the optimal terminal for each transmission beam of the base station. BS_TX4: MS_RX3, BS_TX5: MS_RX1, BS_TX6: MS_RX4 are determined and the corresponding uplink transmit / receive beams BS_RX1: MS_TX3, BS_RX2: MS_TX2, BS_RX3: MS_TX4, BS_RX4: MS_TX3, MS_TX3: MS_TX3: BS_RX6: MS_TX4) is selected. Here, the terminal transmits a random access signal to each of the reception beams of the base station while changing its transmission beam according to the selected transmission / reception beam at a time point corresponding to the selected transmission / reception beam within a random access channel section.

In a fourth scheme, the terminal identifies a reception beam of a terminal corresponding to one transmission / reception beam having the lowest path loss among all transmission / reception beams for the base station, and the base station for the transmission beam of the terminal corresponding to the reception beam of the terminal. It is a way of selecting all the received beams of the. For example, as shown in FIG. 5B, when the reception strengths of the reference signals for the base station transmission beam BS_TX2 and the reception beam MS_RX2 of the terminal are measured to be the largest, the terminal may correspond to the terminal corresponding to the reception beam MS_RX2 of the terminal. Check the transmission beam MS_TX2. Thereafter, as shown in FIG. 6D, the uplink transmit / receive beams (BS_RX1: MS_TX2, BS_RX2: MS_TX2, BS_RX3: MS_TX2, BS_RX4: MS_TX2, BS_RX5: MS_TX2, BS_RX6: MS_TX2) for the transmission beam MS_TX2 of the UE. Choose. Here, the terminal transmits a random access signal to each of the reception beams of the base station through the MS_TX2 at a time point corresponding to the transmission beam MS_TX2 of the terminal within a random access channel section.

The fifth method is a method in which the terminal identifies a transmission beam of a base station having the lowest path loss for each reception beam of the terminal and selects corresponding uplink transmission / reception beams. That is, the fifth method is a method of transmitting a beam training signal by selecting a reception beam of a base station having optimal performance for each transmission beam of the terminal. For example, as shown in FIG. 5B, when the reception strength of the reference signal is measured, the terminal transmits the optimal transmission beams BS_TX5: MS_RX1, BS_TX2: MS_RX2, BS_TX4: MS_RX3 for each reception beam of the terminal. , BS_TX6: MS_RX4) is selected. Thereafter, the terminal selects corresponding uplink transmit / receive beams BS_RX5: MS_TX1, BS_RX2: MS_TX2, BS_RX4: MS_TX3, BS_RX6: MS_TX4 as shown in FIG. 6E. Here, the terminal transmits a random access signal to each of the reception beams of the base station while changing its transmission beam according to the selected transmission / reception beam at a time point corresponding to the selected transmission / reception beam within a random access channel section.

Finally, the sixth method is a method of transmitting a beam training signal using all transmission and reception beams between the base station and the terminal. That is, as shown in Figure 6f, the terminal transmits the beam training signal using all the transmission and reception beams for the base station.

As described above, the terminal may select the transmission beam, and then determine the transmission power for the transmission beam. The terminal may include at least one or more path loss values among the path loss values for all the transmission / reception beams, a received power target value included in control information from a base station, an uplink maximum transmit power, an uplink transmit power adjustment value, and other uplink powers. Control values are used to determine the transmit power for the transmit beam. For example, the terminal may use a value obtained by adding a specific path loss value, a target reception power, and other power control values as transmission power. In this case, the terminal uses a path loss value corresponding to the selected transmission / reception beam as a path loss value for determining transmission power, or using a maximum path loss value or a minimum path loss value among one or more selected transmission / reception beams. The transmit power of the selected one or more transmit / receive beams may be equally determined. In addition, the terminal may use the minimum path loss value or the maximum path loss value among the path loss values for the transmission and reception beams having the same uplink reception beam as the selected transmission and reception beam. In addition, the terminal may determine the transmission power using the minimum path loss value or the maximum path loss value among the path loss values for the entire transmission and reception beams.

For example, as in the first method, when a transmission / reception beam having the lowest path loss is selected among all transmission / reception beams, the terminal may set transmission power for the transmission / reception beam using the path loss value of the selected transmission / reception beam. . Here, the path loss value for the selected transmission / reception beam means a path loss value of the reference signal received from the corresponding downlink transmission / reception beam. That is, as shown in FIG. 6A, when the terminal selects a transmission / reception beam (BS_RX2: MS_TX2), the terminal selects the path loss value (path loss value of BS_TX2: MS_RX2) for the selected transmission / reception beam. The transmission power of the transmission / reception beams BS_RX2: MS_TX2 can be set.

As another example, when the transmission and reception beam is selected to transmit a signal only for a specific reception beam of the base station, as in the second method, the terminal selects a minimum path loss value or a maximum path loss among path loss values corresponding to the selected transmission / reception beam. The transmission power for the transmission / reception beam may be determined using the value. Here, the path loss value for the selected transmission / reception beam means a path loss value of the reference signal received from the corresponding downlink transmission / reception beam. For example, the path loss value for the transmission / reception beam BS_RX2: MS_TX3 refers to the path loss value of the reference signal received from the corresponding downlink transmission / reception beam BS_TX2: MS_RX3. That is, when the terminal selects uplink transmit / receive beams (BS_RX2: MS_TX1, BS_RX2: MS_TX2, BS_RX2: MS_TX3, BS_RX2: MS_TX4) to the base station receive beam BS_RX2 in FIG. 6B, the terminal selects among the path loss values for the transmit / receive beams. The transmission power may be determined using a maximum path loss value (eg, path loss value of BS_TX2: MS_RX4) or a minimum path loss value (eg, path loss value of BS_TX2: MS_RX2). In addition, when the transmission and reception beam is selected to transmit a signal only for a specific reception beam of the base station, as in the second scheme, the terminal uses a minimum path loss value or a maximum path loss value among path loss values for all transmission and reception beams. The transmit power for the transmit and receive beams may be determined.

As another example, when the transmission beam of the terminal having the optimal path loss is selected for each of the reception beams of the base station as in the third scheme, the terminal selects among the path loss values of the reception beams of the base station corresponding to each selected transmission beam. The transmission power of the selected transmission beam may be determined using a minimum path loss value or a maximum path loss value, and the selected transmission beam may be selected using the minimum path loss value or the maximum path loss value among the path loss values for all reference signals. The transmit power of may be determined. Here, the path loss value of the reception beam of the base station means a path loss value measured by the terminal for reference signals received from the transmission beam of the base station corresponding to the reception beam of the base station. For example, the path loss value for the base station reception beam BS_RX1 means a path loss value for the reference signals transmitted from the corresponding base station transmission beam BS_TX1 and received for the respective reception beams of the terminal. That is, in FIG. 6C, transmission / reception using a minimum path loss value or a maximum path loss value among path loss values (BS_TX1: MS_RX1, BS_TX1: MS_RX2, BS_TX1: MS_RX3 and BS_TX1: MS_RX4) among the path loss values for the transmission beam BS_TX1 of the base station. Sets the transmit power for the beam direction BS_RX1: MS_TX3, and among the path loss values (BS_TX2: MS_RX1, BS_TX2: MS_RX2, BS_TX2: MS_RX3 and BS_TX2: MS_RX4) among the path loss values for the transmission beam BS_TX2 of the base station, or The transmit power for the transmit / receive beam direction BS_RX2: MS_TX2 may be set using the maximum path loss value. In addition, the terminal may set the transmission power for all selected transmission / reception beams as shown in FIG. 6C using the minimum path loss value or the maximum path loss value among the path loss values for all transmission / reception beams.

As another example, when the transmission / reception beam is selected to transmit a signal in a specific transmission beam of the terminal as in the fourth scheme, the terminal selects a minimum path loss value or a maximum path loss value from among path loss values corresponding to the selected transmission / reception beam. It may be determined the transmission power for the transmission and reception beams using. Here, the path loss value for the selected transmission / reception beam means a path loss value of the reference signal received from the corresponding downlink transmission / reception beam. For example, a path loss value for the transmission / reception beam BS_RX2: MS_TX2 means a path loss value of the reference signal received from the corresponding downlink transmission / reception beam BS_TX2: MS_RX2. That is, as illustrated in FIG. 6D, when all uplink transmit / receive beams for the transmit beam MS_TX2 of the terminal are selected, downlink beams corresponding to the selected uplink transmit / receive beams BS_TX1: MS_RX2, BS_TX2: MS_RX2, BS_TX3: MS_RX2, Among the path loss values for BS_TX4: MS_RX2, BS_TX5: MS_RX2, BS_TX6: MS_RX2), either the maximum path loss value (e.g., path loss value of BS_TX2: MS_RX2) or the minimum path loss value (e.g., path loss value of BS_TX5: MS_RX2) Transmit power may be determined. In addition, when the transmission / reception beam is selected to transmit a signal only by a specific transmission beam of the terminal as in the fourth scheme, the terminal uses a minimum path loss value or a maximum path loss value among the path loss values for all transmission / reception beams. The transmit power for the transmit and receive beams may be determined.

As another example, when the reception beam of the base station having an optimal path loss is selected for each transmission beam of the terminal as in the fifth scheme, the terminal may select the minimum path loss value or the maximum path loss value from among the path loss values for the selected transmission / reception beams. The transmission power may be determined using the path loss value, or the transmission power may be determined using the minimum path loss value or the maximum path loss value among the path loss values for the entire reference signal. For example, as shown in FIG. 6E, when four uplink transmit / receive beams are selected, the UE may determine path loss values (BS_TX2: MS_RX2, BS_TX4: MS_RX3) for downlink transmit / receive beams corresponding to the selected uplink transmit / receive beams. The transmission power for the selected four uplink transmission / reception beam directions may be determined using a minimum path loss value or a maximum path loss value among the path loss values of BS_TX5: MS_RX1 and BS_TX6: MS_RX4).

Lastly, as in the sixth scheme, when all uplink transmit / receive beams are used between a base station and a terminal, the terminal transmits the uplink transmit / receive using a path loss value of a downlink transmit / receive beam corresponding to each uplink transmit / receive beam. The transmit power of the beam may be determined, or the transmit power of the uplink transmit / receive beam may be determined using a minimum path loss value or a maximum path loss value among path loss values for the entire reference signal.

7 illustrates a procedure of a base station receiving an uplink random access in a wireless communication system supporting beamforming according to an embodiment of the present invention.

Referring to FIG. 7, the base station transmits a downlink reference signal for beam training using a plurality of transmission beams having different directions in step 701. In this case, the base station transmits the reference signal through the respective transmission beams a number of times corresponding to the number of reception beams of the terminal. For example, when there are M transmission beams of the base station and N reception beams of the terminal, the base station transmits the reference signal by M × N times by transmitting the reference signal N times through each of the M transmission beams. Here, each reference signal includes information on the transmission beam of the base station which transmitted the reference signal.

In step 703, the base station transmits control information for controlling power for uplink through a broadcast control channel or unicast signaling. The control information includes uplink power control information such as a transmission power of the reference signal, a target reception power of an uplink signal, an uplink maximum transmission power, an uplink transmission power adjustment value, and a response waiting time.

In step 705, the base station attempts to receive an uplink signal using a plurality of receive beams having different directions, and determines whether an uplink signal is received in step 707. In this case, the base station attempts to receive an uplink signal while changing the reception beam according to a preset scheme, and thus, the base station attempts to receive an uplink signal, and the uplink signal is selected from the transmission beam selected by the terminal based on path loss among different transmission and reception beams formed between the base station and the terminal. Can be received. In this case, the base station may determine whether to receive the uplink signal by combining uplink signals received through different transmission and reception beams. The uplink signal may be a random access signal.

If the uplink signal is received, the base station transmits a response signal indicating that the uplink signal has been received to the terminal in step 709. In this case, when a plurality of uplink signals are received from a terminal, the base station may determine a reception beam of the base station and a transmission beam of the terminal for receiving an uplink signal after random access based on the reception strength of the uplink signal. Information on the determined transmission beam of the terminal may be indicated in the response signal. Here, the base station may determine a plurality of uplink transmission and reception beams for receiving an uplink signal after random access based on the reception strength of the uplink signal. Accordingly, the base station may combine and process signals received through a plurality of uplink transmit / receive beams after random access, thereby improving communication efficiency.

On the other hand, when the uplink signal is not received, the base station terminates the procedure according to the present invention.

8 illustrates an uplink random access procedure of a terminal in a wireless communication system supporting beamforming according to an embodiment of the present invention.

Referring to FIG. 8, in step 801, the terminal receives a downlink reference signal using a plurality of receive beams having different directions. In this case, the terminal receives the downlink reference signal from the base station while changing the reception beam according to a preset scheme. For example, when there are M transmission beams of a base station and N reception beams of a terminal, the terminal receives M reference beams received from M transmission beams through M reception beams, thereby receiving the reference signal M times. Attempt to receive M × N times. Here, each reference signal includes information on the transmission beam of the base station which transmitted the reference signal.

In step 803, the terminal receives control information for controlling uplink transmission power from the base station. Here, the control information may be received through a broadcast control channel or may be received through unicast signaling. The control information includes uplink power control information such as a transmission power of the reference signal, a target reception power of an uplink signal, an uplink maximum transmission power, an uplink transmission power adjustment value, and a response waiting time.

In step 805, the terminal receives a reference signal received through each transmit / receive beam using a difference between the reception strength of the downlink reference signal received through the plurality of transmit / receive beams and the transmit power of the reference signal included in the control information. Calculate the path loss for each. In step 807, the terminal selects a transmission beam to transmit an uplink signal based on the path loss. In this case, the terminal may select the transmission beam according to any one of the six methods described above. For example, the terminal may select one transmit / receive beam having the lowest path loss among all transmit / receive beams for the base station according to the first scheme described above. In addition, the terminal checks the transmission beam of the base station corresponding to one transmission and reception beam having the lowest path loss among all transmission and reception beams for the base station according to the second method described above, and receives the base station corresponding to the transmission beam of the base station. It is possible to select all transmit beams for the beam. In addition, the terminal may identify the reception beam of the terminal having the lowest path loss for each transmission beam of the base station according to the third method described above, and select uplink transmission / reception beams corresponding thereto. In addition, the terminal checks the reception beam of the terminal corresponding to the one transmission and reception beam having the lowest path loss among all the transmission and reception beams for the base station according to the fourth scheme described above, and the terminal corresponding to the reception beam of the terminal. After the transmission beam is selected, all reception beams of the base station can be selected for the transmission beam of the terminal. In addition, the terminal may identify the transmission beam of the base station having the lowest path loss for each of the reception beams of the terminal according to the fifth method described above, and select uplink transmission / reception beams corresponding thereto. In addition, the terminal may select all transmit and receive beams for the base station according to the sixth method described above.

In step 809, the terminal determines transmission power for the selected transmission beam. Here, the terminal may include at least one or more path loss values of the path loss values for all the transmission and reception beams, a received power target value included in control information from a base station, an uplink maximum transmission power, an uplink transmission power adjustment value, and other uplink values. Link power control values are used to determine the transmit power for the transmit beam. For example, the terminal may use a value obtained by adding a specific path loss value, a target reception power, and other power control values as transmission power. In this case, the terminal uses a path loss value corresponding to the selected transmission / reception beam as a path loss value for determining transmission power, or a minimum of path loss values for transmission / reception beams having the same uplink reception beam as the selected transmission / reception beam. The path loss value or the maximum path loss value can be used. In addition, the terminal may determine the transmission power using the minimum path loss value or the maximum path loss value among the path loss values for the entire transmission and reception beams. In addition, the terminal may determine the same transmission power for the selected transmission and reception beams by using a minimum path loss value or a maximum path loss value among path loss values corresponding to the selected transmission and reception beams.

In step 811, the terminal transmits an uplink signal, that is, a random access signal at the determined transmission power using the selected uplink transmission / reception beam, and then proceeds to step 813 to determine whether a response signal is received from the base station. do. If a response signal is received from the base station within a preset response waiting time, the terminal determines that the uplink transmission has been successfully performed in step 815 and terminates the random access procedure according to the present invention. In this case, the terminal and the base station is a collision resolution operation in case a plurality of terminals receive the same response signal because the collision occurs because the uplink transmission signal of the terminal and the uplink transmission signal of the other terminal is transmitted in the same resource region. (collision resolution) can be performed, and the operation related to channel setting can be performed.

On the other hand, when a response signal is not received from the base station within a preset response waiting time, the terminal proceeds to step 817 and determines whether the determined transmission power is smaller than a predetermined uplink maximum transmission power. If the determined transmit power is smaller than a predetermined uplink maximum transmit power, the terminal checks an uplink transmit power adjustment value in the control information in step 819 and increases the determined transmit power by the uplink transmit power adjustment value. . At this time, when the increased transmission power is greater than the preset uplink maximum transmission power, the terminal sets the uplink maximum transmission power to the uplink transmission power of the terminal. Thereafter, the terminal returns to step 811 or step 801 (not shown) to start the uplink signal retransmission operation. If the terminal returns to step 801 and reselects the transmission / reception beam used for uplink signal retransmission, the terminal is used to transmit or retransmit the newly selected transmission / reception beam and previous uplink signal through steps 801 to 807. The uplink transmit / receive beam may be finally selected in consideration of the history information of the received transmit / receive beams. As a specific method of finally selecting the transmit / receive beam in step 807, a method of selecting the transmit / receive beam closest to a direction obtained by averaging the directions of the newly selected transmit / receive beam and the transmit / receive beams used in the previous uplink signal transmission in step 807. Can be used. The method of averaging directions of the transmission and reception beams may be applied separately to each of the transmission beam and the reception beam. That is, the transmission beam closest to the direction obtained by averaging the directions of the newly selected transmission beam and the transmission beams used for the previous uplink signal transmission in step 807 may be selected as the final transmission beam, and the newly selected uplink reception in step 807. The reception beam closest to the direction obtained by averaging the directions of the beams and the reception beams used to receive the previous uplink signal may be selected as the final reception beam.

As another method of finally selecting the transmit / receive beam in operation 807, selecting the transmit / receive beam closest to a direction in which the direction of the newly selected transmit / receive beam and the transmit / receive beams used for previous uplink signal transmission are weighted averaged in step 807. Method can be used. In the weighted averaging method used in step 807, the direction of the newly selected transmit / receive beam is multiplied by a constant 1, and the most recently used or selected transmit / receive beams used for uplink signal transmission are closer to 1 (greater than 0). ) Multiplying a constant and averaging may be used. The weighted average of the directions of the transmission and reception beams may be separately applied to each of the transmission beam and the reception beam.

On the other hand, if the determined transmit power is equal to or greater than the uplink maximum transmit power, the terminal determines that the uplink signal transmission has failed in step 821, waits for a predetermined time, and then returns to step 807 to perform the following steps. Rerun As another example, when the number of retransmissions of the uplink signal is less than the maximum number of retransmissions in step 821, the terminal may perform the retransmission of the uplink signals until the number of retransmissions of the uplink signal reaches the maximum number of retransmissions. Can be.

9 is a block diagram of a base station in a wireless communication system supporting beamforming according to an embodiment of the present invention.

Referring to FIG. 9, the base station includes a controller 900, a modem 910, an RF chain 920, a beamformer 930, and a data queue 940.

The control unit 900 controls and processes the overall operation of the base station, and in particular, controls the beamforming unit 930 to control and process a function for transmitting and receiving signals to and from the terminal through a plurality of transmit and receive beams having different directions. do.

In particular, the controller 900 controls the beamformer 930 to transmit a reference signal for downlink beam training to the terminal through the plurality of transmission beams having different directionalities, and has a plurality of different directionalities. Controls and processes a function for receiving an uplink beam training signal, that is, a random access signal, from a terminal through a reception beam of. In this case, the reference signal includes information on the transmission beam of the base station that transmitted the reference signal. The controller 900 controls the beamformer 930 to attempt to receive an uplink signal while changing a reception beam according to a preset method, thereby allowing a terminal to route among different transmission / reception beams formed between the base station and the terminal. The uplink signal may be received from the transmission beam selected based on the loss. In addition, the controller 900 controls and processes a function for transmitting control information for controlling uplink transmission power to the terminal. The control information may be transmitted through a broadcast control channel or may be transmitted through unicast signaling. Here, the control information includes a reference signal transmission power, a target reception power, an uplink maximum transmission power, an uplink transmission power adjustment value, a response waiting time, and the like of the base station. Also, when a plurality of uplink signals having different directions are received from the terminal, the controller 900 measures the reception strength of the uplink signal, and receives the uplink signal after random access based on the measured reception strength. Controls and processes a function for determining a transmission beam of a terminal and a reception beam of a base station for transmitting information about the transmission beam to the terminal.

The modem 910 performs baseband signal and bit string conversion function according to the physical layer standard of the system. For example, according to the OFDM scheme, during data transmission, the modem 910 generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then inverse fast fourier. OFDM symbols are configured through a transform operation and cyclic prefix (CP) insertion. In addition, when receiving data, the modem 910 divides a baseband signal into OFDM symbol units, restores signals mapped to subcarriers through fast fourier transform (FFT) operation, and then receives and receives received bits through demodulation and decoding. Restore heat

The RF chain 920 converts a baseband digital signal stream provided from the modem 910 into an analog signal of an RF band. For example, the RF chain 920 may include an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), a filter, and the like. 9 illustrates only one RF chain 920, the base station may include a plurality of RF chains according to an embodiment of the present invention.

The beamforming unit 930 includes a plurality of components, each of which adjusts the phase and magnitude of the signal in each antenna path. That is, the beamforming unit 930 adjusts the phase and the magnitude of the signal transmitted through each antenna path according to the phase and magnitude values of the signal for each antenna provided from the controller 900, thereby transmitting and receiving beams having different directionality. Can be formed. In FIG. 9, a path corresponding to each antenna is shown as one, and components in each path are also shown as one per antenna. However, according to another embodiment of the present invention, a transmission path and a reception path for each antenna are shown. May be configured separately, and in this case, two components of the beamforming unit 930 may exist per antenna.

The data queue 940 stores data received from an upper network node for each terminal or service.

In FIG. 9, a block configuration for a case where the base station forms a plurality of transmit and receive beams through analog beamforming has been described as an example. However, a base station according to the present invention can be configured using at least one of digital beamforming, beamforming physically moving an antenna, antennas corresponding to each predefined beam direction, antenna bundles, or antenna arrays. It may form a transmit and receive beam of. In the case of the digital beamforming, the beamforming unit 930 may be omitted, and the controller 900 may support a plurality of transmission / reception beams by performing beamforming by multiplying a transmission signal by a codebook. That is, the transmission and reception beams represented in the present invention mean not only an antenna in which the beam is physically fixed, but also a beam having a narrow width formed through various methods such as digital beamforming and analog beamforming.

10 is a block diagram of a terminal in a wireless communication system supporting beamforming according to an embodiment of the present invention.

Referring to FIG. 10, the terminal includes a control unit 1000, a modem 1010, an RF chain 1020, a beamforming unit 1030, and a storage unit 1040.

The control unit 1000 controls and processes the overall operation of the terminal, and in particular, controls the beamforming unit 1030 to control and process a function for transmitting and receiving a signal with a base station through a plurality of transmit and receive beams having different directions. .

In particular, the controller 1000 controls the beamformer 1030 to receive a reference signal for downlink beam training through the plurality of receive beams having different directionalities, and transmits a plurality of transmits having different directionalities. Control and process the function for transmitting the uplink random access signal through the beam. In this case, the reference signal includes information on the transmission beam of the base station that transmitted the reference signal. In addition, the controller 1000 controls and processes a function for receiving control information for controlling uplink transmission power from a base station. The control information may be received through a broadcast control channel or may be received through unicast signaling. Here, the control information includes a reference signal transmission power, a target reception power, an uplink maximum transmission power, an uplink transmission power adjustment value, a response waiting time, and the like of the base station.

Particularly, when a plurality of reference signals having different directions are received from the base station through the uplink controller 1002, the controller 1000 measures the reception strength of the reference signal and based on the measured reception strength. It measures the path loss for each transmit and receive beam, selects the transmit and receive beam for uplink signal transmission based on the path loss, and controls and processes a function for determining the transmit power for the selected transmit and receive beam. That is, the uplink controller 1002 may select a transmission / reception beam for uplink signal transmission using any one of six methods as shown in FIGS. 6A to 6D. In addition, the uplink controller 1002 may include at least one or more path loss values of the path loss values for all transmission / reception beams with the base station, a target power reception value of the base station, an uplink maximum transmission power, an uplink transmission power adjustment value, and the like. Uplink power control values are used to determine the transmit power for the transmit beam.

The modem 1010 performs a baseband signal and bit string conversion function according to the physical layer standard of the system. For example, according to the OFDM scheme, during data transmission, the modem 1010 generates complex symbols by encoding and modulating a transmission bit stream, maps the complex symbols to subcarriers, and then inverse fast fourier. OFDM symbols are configured through a transform operation and cyclic prefix (CP) insertion. In addition, upon receiving data, the modem 1010 divides the baseband signal into OFDM symbol units, restores signals mapped to subcarriers through fast fourier transform (FFT) operation, and then receives and demodulates the received bits through demodulation and decoding. Restore heat

The RF chain 1020 converts a baseband digital signal stream provided from the modem 1010 into an analog signal of an RF band. For example, the RF chain 1020 may include an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), a filter, and the like. 10 illustrates only one RF chain 1020, the base station may include a plurality of RF chains according to an embodiment of the present invention.

The beamformer 1030 includes a plurality of components, each of which adjusts a phase and a magnitude of a signal in each antenna path. That is, the beamforming unit 1030 adjusts the phase and the magnitude of the signal transmitted through each antenna path according to the phase and magnitude values of the signal for each antenna provided from the control unit 1000, thereby transmitting and receiving beams having different directions. Can be formed. In FIG. 10, a path corresponding to each antenna is shown as one, and components in each path are also shown as one per antenna. However, according to another embodiment of the present invention, a transmission path and a reception path for each antenna are shown. May be configured separately, and in this case, two components of the beamforming unit 1030 may exist per antenna.

The storage unit 1040 stores various programs and data necessary for the operation of the terminal, and stores control information received from the base station.

In FIG. 10, a block configuration for a case where the terminal forms a plurality of transmit and receive beams through analog beamforming has been described as an example. However, the terminal according to the present invention uses a plurality of terminals using at least one of digital beamforming, beamforming physically moving the antenna, antennas corresponding to each predefined beam direction, antenna bundles, or antenna arrays. It may form a transmit and receive beam of. In the case of the digital beamforming, the beamforming unit 1030 may be omitted, and the controller 1000 may support a plurality of transmission / reception beams by performing beamforming by multiplying a transmission signal by a codebook. That is, the transmission and reception beams represented in the present invention mean not only an antenna in which the beam is physically fixed, but also a beam having a narrow width formed through various methods such as digital beamforming and analog beamforming.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

Claims (20)

A method of a terminal for uplink control in a wireless communication system supporting beamforming,
Receiving downlink reference signals from a plurality of transmit beams of a base station using a plurality of receive beams having different directionalities,
Measuring path loss based on received signal strength of each of a plurality of downlink reference signals received through different transmission and reception beams;
Selecting a transmission beam of a terminal for uplink based on path loss values measured for each of the plurality of downlink reference signals;
Transmitting an uplink signal using the selected transmission beam.
The method of claim 1,
The process of selecting a transmission beam of the terminal for the uplink,
Comparing path loss values for each of a plurality of downlink reference signals received through the different transmission and reception beams;
Selecting an uplink transmit / receive beam corresponding to the transmit / receive beam of the downlink reference signal having the smallest path loss value.
The method of claim 1,
The process of selecting a transmission beam of the terminal for the uplink,
Comparing path loss values for each of a plurality of downlink reference signals received through the different transmission and reception beams;
Identifying a base station reception beam corresponding to a transmission beam of a downlink reference signal having the smallest path loss value;
And selecting all transmission beams of the terminal for the identified base station reception beam.
The method of claim 1,
The process of selecting a transmission beam of the terminal for the uplink,
Comparing path loss values for each of a plurality of downlink reference signals received through the different transmission and reception beams;
Identifying a downlink reference signal having the smallest path loss value for each transmission beam of the base station;
And selecting an uplink transmit / receive beam corresponding to the transmit / receive beam of the downlink reference signal identified for each transmit beam of the base station.
The method of claim 1,
The process of selecting a transmission beam of the terminal for the uplink,
Comparing path loss values for each of a plurality of downlink reference signals received through the different transmission and reception beams;
Identifying a transmission beam of the terminal corresponding to the reception beam of the downlink reference signal having the smallest path loss value;
And selecting all the reception beams of the base station for the transmission beams of the identified terminal.
The method of claim 1,
The process of selecting a transmission beam of the terminal for the uplink,
Comparing path loss values for each of a plurality of downlink reference signals received through the different transmission and reception beams;
Identifying a downlink reference signal having the smallest path loss value for each of the reception beams of the terminal;
And selecting an uplink transmit / receive beam corresponding to the transmit / receive beam of the downlink reference signal identified for each receive beam of the terminal.
The method of claim 1,
Receiving control information on uplink transmission power from the base station;
Determining transmission power for the selected transmission beam based on at least one of the path loss values and the control information of at least one of the path loss values for all the transmission and reception beams,
The control information includes at least one of a downlink reference signal transmission power, a target reception power, an uplink maximum transmission power, an uplink transmission power adjustment value, and a response waiting time of the base station.
The transmit power may include a path loss value corresponding to the selected transmission / reception beam, a minimum or maximum path loss value of the path transmission / reception beams for the selected transmission / reception beams, and path transmission values for transmission / reception beams having the same uplink reception beam as the selected transmission / reception beam. A method of determining using at least one of a minimum or maximum path loss value and a minimum or maximum path loss value among path loss values for all transmit and receive beams.
A method of a base station for uplink control in a wireless communication system supporting beamforming,
Transmitting downlink reference signals for a plurality of receive beams of a terminal by using a plurality of transmit beams having different directionalities;
Receiving an uplink signal from a transmission beam selected by the terminal based on path loss among different transmission and reception beams formed between the base station and the terminal;
Determining an uplink transmit / receive beam based on the received strength of the received uplink signal.
The method of claim 8,
When a plurality of uplink transmit / receive beams are determined as a result of determining an uplink transmit / receive beam based on the received strength of the received uplink signal,
The base station further comprises the step of combining the signals received from the plurality of uplink transmit and receive beams.
The method of claim 8,
The method may further include transmitting control information on an uplink transmission power.
The control information includes at least one of a downlink reference signal transmission power, a target reception power, an uplink maximum transmission power, an uplink transmission power adjustment value, and a response waiting time of a base station.
An apparatus of a terminal for uplink control in a wireless communication system supporting beamforming,
A beamformer forming a plurality of beams having different directions,
The beamformer is controlled to receive downlink reference signals from the plurality of transmit beams of the base station through the plurality of receive beams having different directions, and for each of the plurality of downlink reference signals received through different transmit and receive beams. The path loss is measured based on the received signal strength, the transmission beam of the terminal for the uplink is selected based on the path loss values measured for each of the plurality of downlink reference signals, and the uplink is selected using the selected transmission beam. And a control unit for controlling a function for transmitting a signal.
12. The method of claim 11,
The controller may compare path loss values for each of a plurality of downlink reference signals received through the different transmission and reception beams, and uplink transmission and reception beams corresponding to transmission and reception beams of a downlink reference signal having the smallest path loss value. Select your device.
12. The method of claim 11,
The control unit compares path loss values for each of a plurality of downlink reference signals received through the different transmission and reception beams, and compares a base station reception beam corresponding to a transmission beam of a downlink reference signal having the smallest path loss value. And confirming and selecting all transmission beams of the terminal for the identified base station reception beam.
12. The method of claim 11,
The controller compares path loss values for each of a plurality of downlink reference signals received through the different transmission and reception beams, and identifies a downlink reference signal having the smallest path loss value for each transmission beam of the base station. And an uplink transmit / receive beam corresponding to the transmit / receive beam of the downlink reference signal identified for each transmit beam of the base station.
12. The method of claim 11,
The control unit compares path loss values for each of a plurality of downlink reference signals received through the different transmission and reception beams, and transmits the terminal corresponding to the reception beam of the downlink reference signal having the smallest path loss value. The apparatus for identifying a beam and selecting all received beams of the base station for the transmitted beam of the identified terminal.
12. The method of claim 11,
The controller may compare path loss values for each of a plurality of downlink reference signals received through the different transmission and reception beams, and identify a downlink reference signal having the smallest path loss value for each reception beam of the terminal. And selecting an uplink transmission / reception beam corresponding to the transmission / reception beam of the downlink reference signal identified for each reception beam of the terminal.
12. The method of claim 11,
The control unit receives control information on uplink transmission power from the base station and transmits the selected transmission beam based on at least one of path loss values and control information among at least one path loss value for all transmission / reception beams. Determine power,
The control information includes at least one of a downlink reference signal transmission power, a target reception power, an uplink maximum transmission power, an uplink transmission power adjustment value, and a response waiting time of the base station.
The transmit power may include a path loss value corresponding to the selected transmission / reception beam, a minimum or maximum path loss value of the path transmission / reception beams for the selected transmission / reception beams, and path transmission values for transmission / reception beams having the same uplink reception beam as the selected transmission / reception beam. 10. An apparatus determined using at least one of a minimum or maximum path loss value and a minimum or maximum path loss value among path loss values for all transmit and receive beams.
An apparatus of a base station for uplink control in a wireless communication system supporting beamforming,
A beamformer forming a plurality of beams having different directions,
The beamformer is controlled to transmit downlink reference signals for a plurality of reception beams of a terminal through a plurality of transmission beams having different directionalities, and a path loss is generated by the terminal among different transmission / reception beams formed between the base station and the terminal. And a controller configured to receive an uplink signal from a transmission beam selected based on the background and control a function for determining an uplink transmission / reception beam based on the reception strength of the received uplink signal.
19. The method of claim 18,
The controller may determine the uplink transmit / receive beam based on the received strength of the received uplink signal and, when a plurality of uplink transmit / receive beams are determined, combine the signals received from the plurality of uplink transmit / receive beams. Device to perform.
19. The method of claim 18,
The control unit controls a function for transmitting control information on uplink transmission power,
The control information includes at least one of a downlink reference signal transmission power, a target reception power, an uplink maximum transmission power, an uplink transmission power adjustment value, and a response waiting time of the base station.
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