KR102379542B1 - METHODS FOR TRANSMITTING AND RECEVING REFERENCE SIGNALS AND FEEDBACKS IN mmWAVE COMMUNICATION SYSTEMS AND APPARATUSES THEREOF - Google Patents

Abstract

The present embodiments relate to a method and apparatus for transmitting and receiving a beam reference signal or a beam adjustment reference signal between a terminal and a base station in an ultra-high frequency mobile communication system, and to transmit and receive feedback information thereto, wherein the terminal receives a beam reference signal or a beam received from a base station By measuring the adjustment reference signal and transmitting feedback information such as radio resource management information or channel state information thereto to the base station, the base station adjusts the transmit beam of the base station or the receive beam of the terminal according to the feedback information received from the terminal to move the ultra-high frequency In a communication system, phase noise between subcarriers is reduced, signal attenuation is overcome, and a signal can be transmitted/received between a terminal and a base station.

Description

Method and apparatus for transmitting and receiving reference signals and feedback in ultra-high frequency mobile communication system

The present embodiments relate to a method and apparatus for transmitting and receiving a reference signal and feedback information between a terminal and a base station in an ultra-high frequency mobile communication system.

Mobile communication systems are developing into high-speed, high-quality wireless packet data communication systems to provide data services and multimedia services, away from providing voice-oriented services in the early days.

Recently, various mobile communication standards such as High Speed Downlink Packet Access (HSDPA) of 3GPP, High Speed Uplink Packet Access (HSUPA), Long Term Evolution (LTE), and Long Term Evolution Advanced (LTE-Advanced) of 3GPP have introduced high-speed, high-quality wireless packets. It was developed to support data transmission services. In particular, the LTE system is a system developed to efficiently support high-speed wireless packet data transmission and maximizes the capacity of the wireless system by utilizing various wireless access technologies. The LTE-Advanced system is an advanced wireless system of the LTE system and has improved data transmission capability compared to LTE.

The LTE/LTE-Advanced system uses MIMO (Multiple Input Multiple Output) and OFDMA (Orthogonal Frequency Division Multiple Access) technologies to make good use of the advantages of each technology.

Among them, OFDMA provides an advantage of increasing capacity by allowing different terminals to perform scheduling on one frequency axis. That is, if the channel varying with time and the channel varying with frequency are used together, a large capacity gain can be obtained by combining with an appropriate scheduling method.

On the other hand, when OFDM is used in a frequency band of 28 GHz, which is higher than the LTE system targeting 6 GHz or less, the effect of phase noise between sub-carriers increases, so a larger sub-carrier interval is required than in the existing LTE system. In addition, at a high frequency, it is necessary to apply a beam forming technique using an antenna array having a plurality of antenna elements having a signal attenuation degree.

An object of the present embodiments is to provide a resource utilization structure for performing data transmission/reception by utilizing a given time-frequency resource when OFDM is used in a very high frequency mobile communication system, and a method for transmitting and receiving a signal between a terminal and a base station.

It is an object of the present embodiments to provide a method for a terminal to measure a beam reference signal received from a base station in an ultra-high frequency mobile communication system and to transmit a feedback thereto.

In one aspect, the present embodiments provide a method for a terminal to transmit feedback information in an ultra-high frequency mobile communication system, the method comprising: receiving, by the terminal, a beam reference signal from a base station; and receiving the reference signal in a subframe in which the beam reference signal is received A method comprising: identifying a preferred symbol based on power or reference signal reception quality; and transmitting radio resource management information or channel state information for an antenna port or antenna array with respect to the preferred symbol to a base station; do.

In the step of receiving the beam reference signal from the base station, the terminal receives the beam reference signal from 8 subcarriers consecutive in units of 12 subcarriers in the symbol in which the beam reference signal is transmitted, and receives other signals from the remaining 4 subcarriers. can do.

In the step of transmitting the radio resource management information or channel state information to the base station, the radio for the preferred antenna port or antenna array based on the reference signal reception power or the reference signal reception quality with respect to the beam reference signal port included in the preferred symbol. Resource management information or channel state information may be transmitted to the base station.

Alternatively, radio resource management information or channel state information for all antenna ports or all antenna arrays may be transmitted for a preferred symbol.

Alternatively, radio resource management information or channel state information for B antenna arrays or 2B antenna ports may be transmitted for a preferred symbol, where B is a value obtained by dividing the number of the identified beam reference signal antenna ports by 2 there is.

Alternatively, radio resource management information or channel state information for one specific antenna array or one specific antenna port with respect to a preferred symbol may be transmitted.

On the other hand, the terminal may transmit radio resource management information or channel state information in the K-th subframe from the subframe in which the beam reference signal is received, where K is the subframe in which the terminal receives data and feedback information on data It may be the same value as the difference between the subframes transmitting .

The method for transmitting feedback information of the terminal may further include receiving a beam steering reference signal from the base station and transmitting feedback information on the received beam steering reference signal to the base station.

In this case, the beam adjustment reference signal may be scheduled in the N-th subframe and received in the N+R-th subframe, and feedback information may be transmitted in the N+R+K'-th subframe.

Here, R may be a fixed value or a value determined according to an index of a scheduled subframe.

In another aspect, the present embodiments provide a method for a base station to receive feedback information in an ultra-high frequency mobile communication system, the method comprising the steps of: transmitting a beam reference signal to a terminal; Provided is a method comprising the step of receiving radio resource management information or channel state information for an antenna port or an antenna array with respect to a preferred symbol based on a reference signal reception quality.

In another aspect, the present embodiments provide, in a terminal for transmitting feedback information in an ultra-high frequency mobile communication system, a communication unit for receiving a beam reference signal transmitted by a base station, and a reference signal reception power or A control unit for generating feedback information including radio resource management information or channel state information about an antenna port or antenna array for a preferred symbol based on a reference signal reception quality and transmitting the generated feedback information to a base station through a communication unit It provides a terminal that

In another aspect, the present embodiments, in a base station receiving feedback information in an ultra-high frequency mobile communication system, transmits a beam reference signal to the terminal and determines the reference signal reception power or reference signal reception quality in a subframe in which the beam reference signal is transmitted A communication unit for receiving radio resource management information or channel state information for an antenna port or antenna array with respect to a symbol preferred as a reference, and data to be transmitted to the terminal using the received radio resource management information or channel state information is mapped to a specific resource It provides a base station including a control unit.

According to the present embodiments, phase noise between subcarriers is reduced, signal attenuation is overcome, and signals can be transmitted/received between a terminal and a base station in an ultra-high frequency mobile communication system.

According to the present embodiments, a beam reference signal or a beam adjustment reference signal is measured and a time for transmitting a feedback is guaranteed in the ultra-high frequency mobile communication system, thereby adjusting the beam applied to the signal transmitted to the terminal according to the measurement result and transmitting and receiving the signal. make it possible

1 is a diagram illustrating time and frequency resources in an LTE/LTE-Advanced system.
2 is a diagram illustrating time-frequency parameters used in LTE.
3 is a diagram illustrating the location of PSS/SSS used in an LTE system operating in TDD.
4 is a diagram illustrating radio resources of 1 subframe and 1 resource block, which are the minimum units for downlink scheduling in the LTE/LTE-Advanced system.
5 is a diagram illustrating a method of using each region and signal in radio resources of 1 subframe and 1 resource block, which are the minimum units for downlink scheduling in the LTE/LTE-Advanced system.
6 is a diagram for explaining an operation of checking scheduling information using a PDCCH region.
7 is a diagram illustrating time-frequency resources and corresponding system parameters for subcarrier intervals of 150 kHz and 75 kHz.
8 is a diagram illustrating an antenna structure used to transmit a signal by forming a beam in an ultra-high frequency mobile communication system.
9 is a diagram illustrating mapping between an antenna port and an antenna element when each base station has one, two, or four antenna arrays.
10 is a diagram illustrating a case in which timing and beam acquisition subframes are transmitted with a period of 5 ms.
11 is a diagram illustrating in detail functions and related structures of signals transmitted in a timing and beam acquisition subframe.
12 is a diagram illustrating possible methods for determining a location of a resource block through which the beam reference signal shown in FIG. 11 is transmitted.
13 is a diagram illustrating a mapping relationship between a beam corresponding to each antenna port in a resource block in which a beam reference signal is transmitted and a subcarrier in the resource block.
14 is a diagram illustrating a possible mapping relationship between a beam for each port and a subcarrier that can be used as a beam reference signal with respect to the total number of antenna ports of a specific base station.
15 is a diagram illustrating methods for the terminal to check the number of antenna ports used by the base station.
16 is a diagram illustrating operations performed by a UE by receiving signals present in a timing and beam acquisition subframe in an initial ultra-high frequency cell access situation.
17 and 18 illustrate methods for a terminal receiving a channel from a beam reference signal to calculate and report radio resource management information such as reference signal reception power (RSRP) or reference signal reception quality (RSRQ) information.
19 is a diagram illustrating methods for a terminal receiving a channel from a beam reference signal to calculate and report channel state information such as RI/PMI/CQI.
20 is a diagram illustrating that a base station schedules and transmits a beam adjustment reference signal.
21A and 21B are diagrams illustrating the structure of a time-frequency resource through which a beam steering reference signal is transmitted.
22 is a diagram showing the configuration of a terminal in the ultra-high frequency mobile communication system according to the present embodiments.
23 is a diagram illustrating a configuration of a base station in an ultra-high frequency mobile communication system according to the present embodiments.
24 is a diagram illustrating a method for a terminal to transmit feedback information according to the present embodiments.
25 is a diagram illustrating a method for a base station to receive feedback information according to the present embodiments.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the nature, order, order, or number of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It will be understood that each component may be “interposed” or “connected”, “coupled” or “connected” through another component.

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

In other words, in this specification, the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category/type that performs LTE-based MTC-related operations. Alternatively, in this specification, the MTC terminal supports improved coverage compared to the existing LTE coverage, or a UE category/type defined in 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost (or low complexity) UE category/type.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice and packet data. A wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB). A user terminal in the present specification is a comprehensive concept meaning a terminal in wireless communication, and as well as UE (User Equipment) in WCDMA, LTE, HSPA, etc., MS (Mobile Station) in GSM, User Terminal (UT), SS (Subscriber Station), a wireless device (wireless device), etc. should be interpreted as a concept that includes all.

A base station or cell generally refers to a station communicating with a user terminal, and is a Node-B (Node-B), an evolved Node-B (eNB), a sector, a site, and a BTS (Node-B). Base Transceiver System), access point (Access Point), relay node (Relay Node), RRH (Remote Radio Head), RU (Radio Unit), may be called other terms such as a small cell.

That is, in the present specification, a base station or cell (cell) is a generic meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, Node-B in WCDMA, an eNB or a sector (site) in LTE, etc. It should be interpreted as , and it is meant to cover various coverage areas such as megacells, macrocells, microcells, picocells, femtocells, relay nodes, RRHs, RUs, and small cell communication ranges.

In the various cells listed above, since there is a base station controlling each cell, the base station can be interpreted in two meanings. i) in relation to the radio area, the device itself providing megacells, macrocells, microcells, picocells, femtocells, and small cells, or ii) may indicate the radio area itself. In i), the devices providing a predetermined radio area are controlled by the same entity or all devices interacting to form the radio area cooperatively are directed to the base station. According to the configuration method of the radio area, eNB, RRH, antenna, RU, LPN, point, transmission/reception point, transmission point, reception point, etc. become an embodiment of the base station. In ii), the radio area itself in which signals are received or transmitted from the point of view of the user terminal or the neighboring base station may be indicated to the base station.

Therefore, megacell, macrocell, microcell, picocell, femtocell, small cell, RRH, antenna, RU, LPN (Low Power Node), point, eNB, transmission/reception point, transmission point, and reception point are collectively referred to as a base station. do.

In the present specification, the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification, and are used in an inclusive sense and are not limited by the term or word specifically referred to. A user terminal and a base station are two (Uplink or Downlink) transmission/reception subjects used to implement the technology or technical idea described in the present invention, and are used in an inclusive sense and are not limited by the term or word specifically referred to. Here, the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to and from the base station by the user terminal, and the downlink (Downlink, DL, or downlink) transmits and receives data to the user terminal by the base station means how to

There is no limit to the multiple access scheme applied to the wireless communication system. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA can be used An embodiment of the present invention can be applied to resource allocation such as asynchronous wireless communication evolving to LTE and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB. The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.

For uplink transmission and downlink transmission, a time division duplex (TDD) scheme transmitted using different times may be used, or a frequency division duplex (FDD) scheme transmitted using different frequencies may be used.

In addition, in systems such as LTE and LTE-Advanced, standards are configured by configuring uplink and downlink based on one carrier or carrier pair. Uplink and downlink, PDCCH (Physical Downlink Control CHannel), PCFICH (Physical Control Format Indicator CHannel), PHICH (Physical Hybrid ARQ Indicator CHannel), PUCCH (Physical Uplink Control CHannel), EPDCCH (Enhanced Physical Downlink Control CHannel), etc. Control information is transmitted through the same control channel, and data is transmitted through data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel).

Meanwhile, control information may also be transmitted using an enhanced PDCCH or extended PDCCH (EPDCCH).

In the present specification, a cell is a component carrier having a coverage of a signal transmitted from a transmission/reception point or a coverage of a signal transmitted from a transmission/reception point (transmission point or transmission/reception point), and the transmission/reception point itself. can

A wireless communication system to which the embodiments are applied is a coordinated multi-point transmission/reception system (CoMP system) or a coordinated multi-antenna transmission system in which two or more transmission/reception points cooperate to transmit a signal antenna transmission system), it may be a cooperative multi-cell communication system. The CoMP system may include at least two multiple transmission/reception points and terminals.

The multi-transmission/reception point is a base station or macro cell (hereinafter referred to as 'eNB') and at least one having high transmission power or low transmission power within the macro cell area, which is connected to the eNB with an optical cable or optical fiber and is controlled by wire. It may be the RRH of

Hereinafter, downlink means a communication or communication path from a multi-transmission/reception point to a terminal, and uplink means a communication or communication path from a terminal to a multi-transmission/reception point. In the downlink, the transmitter may be a part of multiple transmission/reception points, and the receiver may be a part of the terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of the multi-transmission/reception point.

Hereinafter, a situation in which signals are transmitted/received through channels such as PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH may be expressed in the form of 'transmitting and receiving PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH'.

Also, hereinafter, the description of transmitting or receiving a PDCCH or transmitting or receiving a signal through the PDCCH may be used to include transmitting or receiving an EPDCCH or transmitting or receiving a signal through the EPDCCH.

That is, the physical downlink control channel described below may mean PDCCH or EPDCCH, and is also used to include both PDCCH and EPDCCH.

In addition, for convenience of explanation, the EPDCCH as an embodiment of the present invention may be applied to a portion described as PDCCH, and the PDCCH may be applied to a portion described as EPDCCH as an embodiment of the present invention.

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

The eNB performs downlink transmission to terminals. The eNB is a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH), which is a main physical channel for unicast transmission, and downlink control information such as scheduling required for the reception of PDSCH and an uplink data channel (e.g., For example, a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a physical uplink shared channel (PUSCH) may be transmitted. Hereinafter, the transmission/reception of a signal through each channel will be described in the form of transmission/reception of the corresponding channel.

A mobile communication system is developing into a high-speed, high-quality wireless packet data communication system to provide data services and multimedia services, away from the initial voice-oriented service provision. Recently, various mobile communication standards such as High Speed Downlink Packet Access (HSDPA) of 3GPP, High Speed Uplink Packet Access (HSUPA), Long Term Evolution (LTE), and Long Term Evolution Advanced (LTE-Advanced) of 3GPP have introduced high-speed, high-quality wireless packets. It was developed to support data transmission services.

In particular, the LTE system is a system developed to efficiently support high-speed wireless packet data transmission and maximizes the capacity of the wireless system by utilizing various wireless access technologies. The LTE-Advanced system is an advanced wireless system of the LTE system and has improved data transmission capability compared to LTE.

The LTE generally means a base station and terminal equipment corresponding to Release 8 or Release 9 of the 3GPP standard organization, and LTE-Advanced means a base station and terminal equipment corresponding to Release 10 of the 3GPP standard organization. Even after the standardization of the LTE-Advanced system, the 3GPP standard organization is proceeding with a standard for a subsequent release with improved performance based on it.

The LTE/LTE-Advanced system utilizes the advantages of each technology by applying multiple input multiple output (MIMO) and orthogonal frequency division multiple access (OFDMA) technologies.

First, MIMO, which transmits radio signals using a plurality of transmission antennas, uses the same time/frequency resources as SU-MIMO (Single User MIMO) that transmits to one terminal, and MU-MIMO ( Multi-User MIMO).

In the case of SU-MIMO, a plurality of transmit antennas transmit radio signals to a plurality of spatial layers for one receiver. In this case, the receiver must have a plurality of reception antennas to support a plurality of spatial layers.

On the other hand, in the case of MU-MIMO, a plurality of transmit antennas transmit radio signals to a plurality of spatial layers with respect to a plurality of receivers. Compared to SU-MIMO, MU-MIMO has an advantage that a receiver does not require a plurality of reception antennas. However, a disadvantage is that since radio signals are transmitted for a plurality of receivers on the same frequency and time resource, mutual interference may occur between radio signals for different receivers.

One of the main factors that can increase capacity through OFDMA is that different terminals can be scheduled on the frequency axis. That is, if a characteristic of a channel that varies with frequency is additionally used, such as a characteristic of a channel that varies with time, it can be combined with an appropriate scheduling method to obtain a large capacity gain.

1 illustrates time and frequency resources in an LTE/LTE-Advanced system.

Referring to Figure 1, the radio resource transmitted by the base station (evolved NodeB, eNB) to the terminal (User Equipment, UE) is divided into resource blocks (Resource Block, RB) 110 units on the frequency axis, and subframes on the time axis ( subframe) (120).

In the LTE/LTE-Advanced system, the resource block 110 generally consists of 12 subcarriers, the subcarrier interval is 15 kHz, and one resource block 110 occupies a band of 180 kHz.

On the other hand, the subframe 120 generally consists of 14 OFDM symbol periods in the LTE/LTE-Advanced system and occupies a time period of 1 msec.

Here, each OFDM symbol section includes a cyclic prefix (CP). The first and eighth OFDM symbols include a 160Ts-long CP, and the remaining OFDM symbols include a 144Ts-long CP. Here, Ts corresponds to 1/(15000x2048) second as the basic time unit of the LTE/LTE-Advanced system.

The LTE/LTE-Advanced system may allocate resources in units of subframes 120 on the time axis in performing scheduling and may allocate resources in units of resource blocks 110 on the frequency axis.

2 shows in detail the time-frequency parameters used in LTE.

In the existing LTE system, in order for the terminal to acquire time-frequency synchronization to a specific cell, the base station transmits a PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal) at a certain time-frequency position, and the terminal receives the corresponding signal to synchronize to acquire

3 shows the location of PSS/SSS used in an LTE system operating in TDD.

Referring to FIG. 3 , in the LTE system operating in TDD, PSS is located in the third OFDM symbol of subframe #1 and subframe #6, and SSS is located in the last OFDM symbol of slot #1 and slot #11.

4 illustrates radio resources of 1 subframe and 1 resource block, which are the minimum units for downlink scheduling in the LTE/LTE-Advanced system.

Referring to FIG. 4 , the downlink scheduling unit of the LTE/LTE-Advanced system consists of one subframe 210 on the time axis and one resource block 220 on the frequency axis.

Such radio resources consist of 12 subcarriers in the frequency domain and 14 OFDM symbols in the time domain to have a total of 168 unique frequencies and time positions.

In LTE/LTE-Advanced, each unique frequency and time location of FIG. 2 is referred to as a resource element (RE). In addition, one subframe consists of two slots each consisting of 7 OFDM symbols.

A plurality of different types of signals as follows may be transmitted to the radio resource shown in FIG. 4 .

1. CRS (Cell-specific Reference Signal) 230: a reference signal transmitted for channel measurement of all terminals belonging to a specific cell

2. DMRS (DeModulation Reference Signal) (240, 241): a reference signal transmitted for data decoding of a specific terminal

3. CSI-RS (Channel Status Information Reference Signal) 270: A reference signal transmitted to a terminal belonging to a specific signal transmission point and used to measure the channel state. A plurality of transmission points may be included in one cell, so that a plurality of CSI-RSs may be transmitted in one cell.

4. PDSCH (Physical Downlink Shared Channel) 250: a data channel transmitted through downlink, which is used by the base station to transmit data to the terminal, and uses resource units in which a reference signal is not transmitted in the data region of FIG. sent

5. Control channel (PDCCH, PCFICH, PHICH) 260: ACK / NACK transmission for control information or uplink HARQ operation required for the UE to receive the PDSCH. The control channel may occupy one to three OFDM symbols for each subframe, and the number of OFDM symbols for the corresponding control channel is notified to the terminal through the PCFICH.

In addition to the above signal, in the LTE-Advanced system, muting can be set so that the CSI-RS 270 transmitted by another base station can be received without interference by terminals of the corresponding cell.

The muting may be applied at a position where the CSI-RS 270 can be transmitted, and in general, the UE skips the corresponding radio resource and receives the data signal. In the LTE-Advanced system, muting is another term called zero-power CSI-RS. Muting is applied to the position of the CSI-RS 270 and is because the transmit power is zero and no signal is transmitted.

The CSI-RS 270 may be transmitted using a portion of the positions indicated by A, B, C, D, E, F, G, H, I, J depending on the number of antennas for transmitting the CSI-RS 270 . there is. In addition, muting can also be applied to using some of the positions indicated by A, B, C, D, E, F, G, H, I, J.

The number of antenna ports supported by the LTE-Advanced system is 2, 4, and 8, respectively, and the CSI-RS may be transmitted using 2, 4, and 8 resource units. When the number of antenna ports is 2, the CSI-RS 270 is transmitted in half of the specific pattern in FIG. 4, and when the number of antenna ports is 4, the CSI-RS is transmitted over the entire specific pattern, and when the number of antenna ports is 8, two CSI-RS is transmitted using a continuous pattern. On the other hand, muting is done in one pattern unit.

As described above, the LTE/LTE-Advanced system utilizes MIMO technology for transmitting data using a plurality of transmit/receive antennas to increase data rate and system capacity. Up to now, the LTE-Advanced system supports up to 8 antenna ports for each terminal, and transmission of up to 8 spatial layers is supported at a time.

In order for a specific base station to perform terminal scheduling for the given time/frequency resource and to determine a precoding method to be applied to a plurality of antennas, a terminal accessing the specific base station measures a downlink channel using the CSI-RS, The channel information for this is reported to the base station.

The LTE/LTE-Advanced system uses the following three types of channel feedback information (Channel Status Information, CSI):

RI (Rank Indicator): Information on the number of spatial layers preferred by the UE

PMI (Precoding Matrix Indicator): index information of the precoding matrix preferred by the UE in a situation where the most recently reported RI is given

CQI (Channel Quality Indicator): Maximum MCS (Modulation and Coding Scheme) level information that satisfies BLER (Block Error Rate) 0.1 in a given situation with the most recently reported RI/PMI

For detailed RI/PMI/CQI definition and reporting cycle, refer to the 3GPP standard document [3GPP TS 36.213].

5 shows a method of using each region and signal in radio resources of one subframe and one resource block, which are the minimum units for downlink scheduling in the LTE/LTE-Advanced system.

In the LTE/LTE-Advanced system, the UE checks a Physical Downlink Control Channel (PDCCH) in every subframe to determine whether data (PDSCH) is transmitted in the corresponding subframe.

Here, as described above, the PDCCH may occupy one to three OFDM symbol areas in every subframe, and terminals receive a PCFICH (Physical Control Format Indicator Channel) to check how many OFDM symbols are used as the PDCCH. .

That is, the base station sets the PCFICH to one of 1, 2, or 3 according to the size of the control channel required in a specific subframe, transmits it to the terminals in the cell, and transmits the PDCCH in an area equal to the set value. In addition, the PDCCH is transmitted over the entire system band, and scheduling information to a specific terminal is transmitted evenly over the entire system band.

The scheduling information included in the PDCCH includes some or all of the following information about UEs that will receive data in the corresponding subframe:

● PDSCH resource allocation information

● Modulation method and code rate information

● HARQ information

● Retransmission/initial transmission classification information

Referring to FIG. 6 in more detail, the UE checks whether a PDSCH transmitted to itself is scheduled by checking a possible PDCCH region from one to three OFDM symbols in a specific subframe.

When scheduling occurs here, after checking in which resource blocks the corresponding PDSCH is located on the frequency, the PDSCH is received and decoded in the remaining OFDM symbols outside the control region for the corresponding resource blocks in the corresponding subframe.

6 shows a case in which M UEs check PDSCH scheduling in a specific subframe, and the location of the PDSCH to be received by each UE is confirmed with information in the PDCCH existing in all bands common to all UEs in the cell.

In addition, in the existing LTE/LTE-Advanced system, the UE must check the PDCCH in the front OFDM symbols of a specific subframe and receive the PDSCH in all the remaining OFDM symbols in the rear to be able to decode one data unit. That is, in the LTE/LTE-Advanced system, the data reception unit of the terminal is 1 ms as one subframe.

Since the LTE/LTE-Advanced system was designed on the assumption that the data reception unit of the terminal is 1 ms in the frequency band of 6 GHz or less, the time-frequency resource structure and signals for using the resource as described above were designed.

However, in the case of a mobile communication system using OFDM in a high frequency band such as 28 GHz, the effect of phase noise between subcarriers increases, so a larger subcarrier spacing is required than the existing LTE system targeting 6 GHz or less. Also, at high frequencies, the degree of attenuation of a signal increases according to distance, so it is necessary to transmit a stronger signal in a specific direction by applying a beamforming technology to the signal.

Accordingly, the present embodiments provide a new time-frequency resource utilization structure that can be used in a high-frequency mobile communication system, and a method for transmitting and receiving signals between a terminal and a base station.

Specifically, the present embodiments provide a resource utilization structure for performing data transmission/reception using a given time-frequency resource when OFDM is used in a high-frequency mobile communication system using a frequency band of several tens of GHz, and a terminal and a base station for the same. A method for transmitting and receiving a signal is provided.

As described above, in the frequency band of several tens of GHz, the effect of phase noise between subcarriers increases, so a large subcarrier spacing is required. In addition, in the frequency band of several tens of GHz, there are available frequencies in units of hundreds of MHz, so it is necessary to maintain a large subcarrier spacing.

In the present embodiments, in order to maintain a large subcarrier spacing with a time-frequency structure similar to that of existing LTE in a new high-frequency mobile communication system, a value corresponding to a multiple of 15 kHz, which is a subcarrier spacing of LTE, is set.

That is, considering the channel environment in the frequency band around 30 GHz, it is determined that it is effective to have a subcarrier spacing of about 5 times or 10 times, so this embodiment considers a subcarrier spacing of 75 kHz or a subcarrier spacing of 150 kHz. .

7 shows time-frequency resources and corresponding system parameters for subcarrier intervals of 150 kHz and 75 kHz, respectively.

Referring to FIG. 7 , assuming an OFDM system using 2048 FFT, the entire system band is configured at 200 MHz and 100 MHz, respectively, and one subframe may be configured with 0.1 ms and 0.2 ms, respectively. Then, even in a high-frequency mobile communication system, a resource block, subframe, and radio frame structure of the same type as LTE/LTE-Advanced can be basically taken.

That is, a resource block consists of 12 subcarriers, a subframe consists of 14 OFDM symbols, and a radio frame consists of 10 subframes.

In a high-frequency mobile communication system, since attenuation of a signal according to distance is severe, beamforming that imparts directivity to all transmission signals needs to be applied to compensate for this.

That is, a beam is formed and transmitted to a signal to collect the strength of the signal in a specific direction and to weaken the signal as it moves away from the specific direction. In other words, in the high-frequency mobile communication system, it is necessary to form a beam and transmit the signals that were assumed to be transmitted in all directions in the cell in the existing LTE/LTE-Advanced.

8 shows an antenna structure used to transmit a signal by forming a beam in a high-frequency mobile communication system.

Referring to FIG. 8 , a base station may have one, two, or four antenna arrays, and each antenna array corresponds to two antenna ports.

Each antenna port generates one of the beamformed analog beams independently of the other antenna ports.

9 shows mapping between an antenna port and an antenna element when each base station has one, two, or four antenna arrays.

One antenna port is connected to the same POLs in a specific antenna array to transmit a signal, and each antenna port can form a plurality of beams independently of each other.

According to the antenna structure described above, PSS/SSS is a part that requires a different type of design in a high-frequency mobile communication system with respect to the existing LTE/LTE-Advanced. In the existing LTE/LTE-Advanced, PSS/SSS is transmitted so that signals can be evenly detected in the entire area of a specific cell, so only one PSS/SSS needs to exist per cell. A plurality of PSS/SSSs must be operated for each cell in order to allow the UE in the entire cell region to detect PSS/SSS.

Assuming that the number of beams to be applied to PSS/SSS is N, a specific cell needs to operate N PSS/SSS. In addition, when the UE receives a specific PSS/SSS, it must be able to determine which beam the corresponding PSS/SSS corresponds to so that the time-frequency synchronization of the corresponding cell can be accurately acquired.

10 shows a situation in which a specific base station applies 14 or 12 beams to PSS/SSS for each antenna port, and PSS/SSS to which different beams are applied are distributed and transmitted to different OFDM symbols within one subframe, there is.

That is, since a specific beam is applied to one PSS/SSS and cell identifier information is included in the PSS/SSS, the UE can check the PSS/SSS to confirm OFDM symbol timing and cell identifier.

In addition, the base station can also acquire subframe timing by transmitting an ESS to which the same beam as PSS/SSS is applied within the same OFDM symbol.

In addition, a beam reference signal (BRS) is transmitted at OFDM symbol timing such as the corresponding PSS/SSS/ESS, so that the UE can also check beam information.

10 shows the situation described above and specifically shows a case in which a timing and beam acquisition (TBA) subframe is transmitted with a period of 5 ms.

Referring to FIG. 10 , a TBA subframe occurs every K-th subframe such as 0, K, and 2K, and includes PSS/SSS/ESS and a beam reference signal (BRS).

PSS/SSS/ESS may be mapped in the middle of the TBA subframe, and a beam reference signal (BRS) allowing the UE to measure various beams at regular intervals may be mapped to the rest.

11 shows in more detail the functions and related structures of signals transmitted in the TBA subframe in more detail.

Referring to FIG. 11 , in a TBA subframe, PSS may be mapped to 6 resource blocks located in the middle of the TBA subframe, and OFDM symbol timing may be obtained.

The SSS can be mapped to the upper six resource blocks of the resource blocks to which the PSS is mapped, and allows a cell ID to be obtained.

The ESS can be mapped to the lower 6 resource blocks of the resource blocks to which the PSS is mapped, and enables subframe timing to be obtained.

The beam reference signal BRS may be distributed and mapped to the entire area except for 18 resource blocks occupied by PSS/SSS/ESS. The beam reference signal BRS allows the terminal to check a beam applied to a signal transmitted to the terminal so that the terminal can measure the beam.

In this case, the beam reference signal (BRS) may be mapped to 8 consecutive subcarriers among 12 consecutive subcarriers in a resource block to which PSS/SSS/ESS is not mapped, and other signals are mapped to the remaining 4 subcarriers. or the signal may not be mapped.

12 shows possible methods for determining the location of a resource block in which the beam reference signal (BRS) shown in FIG. 11 is transmitted.

Referring to FIG. 12 , Option 1 shows a method of mapping a beam reference signal (BRS) at intervals of L resource blocks in the order of resource blocks having a low index except for the middle 18 resource blocks (Sync).

Alternatively, as in Option 2, the beam reference signal (BRS) may be mapped at L resource block intervals in both directions around the central 18 resource block.

In this case, the location of the resource block from which the beam reference signal (BRS) transmission starts may be determined in various ways in each case.

For example, as shown in FIG. 12 , the location of the resource block from which the beam reference signal (BRS) transmission starts may be determined using a function such as Cell-ID and f(A). Here, Cell-ID indicates a cell identifier obtained by the UE from PSS/SSS, and f(A) indicates a function-specific function value with A as an input.

13 illustrates a mapping relationship between a beam corresponding to each antenna port in a resource block in which the beam reference signal (BRS) is transmitted and subcarriers in the resource block described in FIG. 12 .

A subcarrier from which mapping within a resource block is started may be different for each cell identifier, and no signal may be transmitted or other signals may be transmitted to a subcarrier that is not mapped to an antenna port. Here, f'(B) represents a specific function value with B as an input.

14 illustrates possible mapping relationships between a beam for each port and a subcarrier possible with a beam reference signal (BRS) with respect to the total number of antenna ports of a specific base station.

In the case of FIG. 13, when there is no mapped antenna port, no signal may be transmitted on the corresponding subcarrier, or the reference signal of the existing antenna ports may be mapped to be repeatedly transmitted as another method.

For example, in the case of the first method (Option 1), if the number of antenna ports is 2, AP0 and AP1 are transmitted to the T-th and T+1-th subcarriers, respectively, and reference signals are not transmitted in the remaining subcarriers.

On the other hand, in the case of the second method (Option 2), if the number of antenna ports is 2, AP0 is repeatedly transmitted to T, T+2, T+4, and T+6th subcarriers, and AP1 is each T+1 , T+3, T+5, and T+7 th subcarriers are repeatedly transmitted.

In the present embodiments, the method of confirming the number of antenna ports used by the base station to the terminal may correspond to a case in which an LTE cell associated with a high frequency base station directly informs the terminal (Non-standalone), and corresponds to the number of antenna ports According to the beam reference signal design method, the terminal decodes the surrounding data signals by applying the corresponding beam reference signal (BRS), and when decoding is performed, the number of antenna ports is checked and the terminal operations are performed in the future (Standalone). 15 shows the methods described above.

16 illustrates operations performed by a UE by receiving signals present in the TBA subframe in an initial ultra-high frequency cell access situation.

That is, the terminal first receives the PSS in the initial access situation to obtain the timing at which OFDM symbols are transmitted, and additionally receives the SSS to obtain more accurate timing and the ID (Cell-ID) of the corresponding access cell. Thereafter, the ESS is received and the received OFDM symbol corresponds to a number in the corresponding subframe, and subframe timing is obtained.

In addition, the UE receives the beam reference signal (BRS) and the PBCH to obtain a system frame number (SFN) and additionally checks the number of BRS ports. That is, the terminal receives the PBCH and checks which system it has accessed from among the cases shown in FIG. 9 to check the total number of ports of the beam reference signal (BRS). In addition, the terminal receives the beam reference signal (BRS) and measures the channel between the terminals from the base station for each antenna port or each antenna array.

17 shows a terminal receiving a channel from a beam reference signal (BRS), radio resource management such as Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ) information. Management, RRM) information is calculated and reported.

Here, the definitions of RSRP and RSRQ can be easily extended from the definition of the 3GPP TS 36.214 standard.

The first method (Alt 1) in which the UE receives a beam reference signal (BRS) and calculates/reports radio resource management (RRM) information is a UE preferred based on RSRP or RSRQ value in a specific TBA subframe of a specific cell A combination of preferred antenna port or antenna array indices based on the indices of OFDM symbols and RSRP or RSRQ values for beam reference signal (BRS) ports included in the corresponding OFDM symbols and radio resource management (RRM) information are reported together to the base station.

For example, if OFDM symbols preferred by the UE in a specific TBA subframe of a specific cell are Nos. 2 and 5, and antenna arrays 0 and 1 and antenna array 3 are preferred in the OFDM symbols, respectively, the UE is configured as follows The corresponding OFDM symbol index, antenna array combination, and related RRM information along with the Cell-ID of the cell will be reported to the base station:

- Cell-ID + OFDM symbol 2 + AA 0 + RRM information

- Cell-ID + OFDM symbol 2 + AA 1 + RRM information

- Cell-ID + OFDM symbol 5 + AA 3 + RRM information

In FIG. 17, it is assumed that the combination of the antenna port and the antenna array is as follows:

- AP0 + AP1 → AA0

- AP2 + AP3 → AA1

- AP4 + AP5 → AA2

- AP6 + AP7 → AA3

However, the present embodiments are not limited thereto, and a method of reporting separate radio resource management (RRM) information for each preferred AP is also considered, and only the number of APs obtained through a beam reference signal (BRS) or higher-order information is radioactive. Also consider how to obtain and report resource management (RRM) information.

Referring to FIG. 17, the second method (Alt 2) in which the UE receives a beam reference signal (BRS) and calculates/reports radio resource management (RRM) information is a method in which the UE receives RSRP or RSRQ in a specific TBA subframe of a specific cell. It is to report all radio resource management (RRM) information for 4 beam reference signal (BRS) arrays or 8 beam reference signal (BRS) ports with respect to the indices of preferred OFDM symbols based on the value to the base station. .

For example, if OFDM symbols preferred by the UE in a specific TBA subframe of a specific cell are No. 2 and No. 5, antenna arrays 0, 1, 2, 3 or antenna ports 0, 1, 2, For all 3, 4, 5, 6, and 7, the UE will report the OFDM symbol index and all related radio resource management (RRM) information to the base station along with the Cell-ID of the cell as follows:

- Cell-ID + OFDM symbol 2 + 4 (or 8) RRMs

- Cell-ID + OFDM symbol 5 + 4 (or 8) RRMs

Referring to FIG. 18, a third method (Alt 3) in which the UE receives a beam reference signal (BRS) and calculates/reports radio resource management (RRM) information is a method in which the UE receives RSRP or RSRQ in a specific TBA subframe of a specific cell. It is to report all radio resource management (RRM) information for B beam reference signal (BRS) arrangements or 2B beam reference signal (BRS) ports with respect to indices of preferred OFDM symbols based on the value to the base station. .

Here, B is a value obtained by dividing the number of beam reference signal (BRS) antenna ports identified in the PBCH or RRC by two.

For example, if OFDM symbols preferred by the UE in a specific TBA subframe of a specific cell are No. 2 and No. 5, antenna array 0, ..., B-1, or antenna port 0, .. For all of ., 2B-1, the UE will report the OFDM symbol index and all related radio resource management (RRM) information along with the Cell-ID of the cell to the base station as follows:

- Cell-ID + OFDM symbol 2 + B (or 2B) RRMs

- Cell-ID + OFDM symbol 5 + B (or 2B) RRMs

Referring to FIG. 18 , a fourth method (Alt 4) in which the UE receives a beam reference signal (BRS) and calculates/reports radio resource management (RRM) information is a method in which the UE receives RSRP or RSRQ in a specific TBA subframe of a specific cell. Radio resource management (RRM) information is reported to the base station only for AA0 or AP0 with respect to indices of preferred OFDM symbols based on values.

For example, if OFDM symbols preferred by the UE in a specific TBA subframe of a specific cell are No. 2 and No. 5, for AA0 or AP0 in the respective OFDM symbols, the UE together with the Cell-ID of the cell as follows The corresponding OFDM symbol index and related radio resource management (RRM) information will be reported to the base station:

- Cell-ID + OFDM symbol 2 + RRM (for AA0 or AP0)

- Cell-ID + OFDM symbol 5 + RRM (for AA0 or AP0)

It is also assumed in FIG. 18 that two consecutive antenna ports are mapped to one antenna array.

The above-described methods for reporting radio resource management (RRM) information according to the embodiments of the present invention have different advantages and disadvantages depending on the overhead required for reporting or the computational complexity required for the terminal to receive the radio resource management (RRM) information. have

19 is a diagram illustrating methods for a UE receiving a channel from a beam reference signal (BRS) to calculate and report channel state information (CSI) such as RI/PMI/CQI.

The first method in which the UE receives the beam reference signal (BRS) and calculates/reports the channel state information (CSI) includes indices of OFDM symbols preferred by the UE in a specific TBA subframe of a specific cell and the OFDM symbols The combination of the antenna array indexes and the channel state information (CSI) for it are reported together to the base station.

In this case, the channel state information (CSI) indicates channel state information (CSI) corresponding to two ports for each antenna array in consideration of mapping of two antenna ports to one antenna array.

For example, if OFDM symbols preferred by the UE in a specific TBA subframe of a specific cell are Nos. 2 and 5, and antenna arrays 0 and 1 and antenna array 3, respectively, preferred by the UE in the OFDM symbols, the UE is as follows Similarly, the corresponding OFDM symbol index, antenna array combination, and related 2-port channel state information (CSI) will be reported to the base station:

- OFDM symbol 2 + AA 0 + 2-port RI/PMI/CQI (for AP0-1)

- OFDM symbol 2 + AA 1 + 2-port RI/PMI/CQI (for AP2-3)

- OFDM symbol 5 + AA 3 + 2-port RI/PMI/CQI (for AP6-7)

Also in FIG. 19, it is assumed that the combination of the antenna port and the antenna array is as follows:

- AP0 + AP1 → AA0

- AP2 + AP3 → AA1

- AP4 + AP5 → AA2

- AP6 + AP7 → AA3

With respect to the method of calculating/reporting the above-described three channel state information (CSI), the UE always determines to calculate/report the channel state information (CSI) for one selected OFDM symbol and beam reference signal (BRS) arrangement combination. may be In addition, the corresponding channel state information (CSI) may be transmitted while being included in an uplink data channel first transmitted by the UE in the case of an initial access situation.

On the other hand, in the case of a situation in which the UE is already connected to the cell, the corresponding channel state information (CSI) may be reported through a separate feedback channel in the subframe that appears after the kth in the subframe in which the beam reference signal (BRS) is transmitted. The value of k may be set to the same value as the subframe difference for the case where the terminal receives data and reports HARQ feedback for it, so that the feedback does not collide in two cases can be designed.

In addition, the frequency resource in which the channel state information (CSI) is reported may be set by the base station through RRC or may be determined by the Cell-ID and the terminal identifier.

In the very high frequency system according to the present embodiments, in order for the base station to adjust the transmit beam (Tx Beam) transmitted to a specific terminal or to adjust the receive beam (Rx Beam) received by the terminal, in addition to the beam reference signal (BRS), the beam adjustment criterion A signal (Beam Refinement Reference Signal, BRRS) may be additionally transmitted.

20 illustrates that the base station schedules and transmits a beam steering reference signal (BRRS).

20, when the beam steering reference signal (BRRS) is scheduled in subframe n, the beam steering reference signal (BRRS) may be transmitted in the r-th subframe thereafter, and then in the k'-th subframe, the terminal Feedback information on the received beam steering reference signal (BRRS) may be reported to the terminal.

Here, r may be fixed to a value such as 0 or may be determined to be a different value depending on the index of the scheduled subframe.

Also, k' may be designed to have a fixed value. Here, the feedback information on the beam steering reference signal (BRRS) transmitted in the k′-th subframe after scheduling includes the preferred Tx beam index information and the preferred antenna array index for the corresponding Tx beam as in the beam reference signal (BRS). Information and related channel state information (CSI) may be reported, or preferred Tx beam index information and Q-port channel state information (CSI) may be reported as another method. Here, Q may be a value identified through the PBCH or RRC.

21A and 21B show the structure of a time frequency resource through which the beam steering reference signal (BRRS) described above is transmitted.

In a situation where the beam steering reference signal (BRRS) is transmitted in a specific subframe, the beam steering reference signal (BRRS) may allow the beam steering reference signal (BRRS) for a specific antenna port to be transmitted over several consecutive subcarriers, For OFDM symbols to which the same Tx beam is applied, hopping may be applied to transmit different frequency resources for each OFDM symbol.

When transmitting the beam steering reference signal (BRRS) for multiple Tx beams, the same beam steering reference signal (BRRS) structure may be repeatedly transmitted and transmitted by applying different Tx beams to each.

The UE may adjust the Rx beam through several OFDM symbols of beam coordination reference signals (BRRS) to which one specific Tx beam is applied. In a situation where multiple Tx beams are applied, the UE may report which Tx beam is preferred in the subsequent channel state information (CSI) reporting situation.

21A and 21B illustrate a case in which 8 OFDM symbols are used for one Tx beam, but not limited thereto, 4 or other values are used and hopping is applied in a similar way to obtain a beam control reference signal (BRRS). can be transmitted

As another method, as shown in FIG. 22, the beam steering reference signal (BRRS) may allow the beam steering reference signal (BRRS) resource for a specific antenna port to be transmitted while being distributed over the frequency area. Similarly, hopping is applied for each OFDM symbol. It is also possible to transmit the same pattern multiple times in units of multiple OFDM symbols to enable Tx beam adjustment through Tx beam selection and reporting.

22 is a diagram showing the configuration of a terminal 2200 in the ultra-high frequency mobile communication system according to the present embodiments.

Referring to FIG. 22 , the terminal 2200 according to the present embodiments includes a communication unit 2210 and a control unit 2220 , and the control unit 2220 includes a system synchronizer 2221 , a channel estimator 2222 , and data. A decoder 2223 may be included.

The communication unit 2210 of the terminal 2200 receives signals such as PSS/SSS, a reference signal (RS), and data transmitted by the base station and transmits them to the control unit 2220 .

The control unit 2220 obtains synchronization from the received signals received from the communication unit 2210 , also checks beam information, receives the reference signal RS for each purpose of the reference signal RS, and receives a channel according to the reference signal RS. Estimation and feedback information may be generated, and data decoding may be performed using another reference signal (RS). The feedback information may be reported to the base station through the communication unit 2210 .

The system synchronizer 2221 , the channel estimator 2222 , and the data decoder 2223 may be some functions of the controller 2220 or may exist separately.

23 shows the configuration of the base station 2300 in the ultra-high frequency mobile communication system according to the present embodiments.

Referring to FIG. 23 , the base station 2300 according to the present embodiments may include a communication unit 2310 and a control unit 2320 , and the control unit 2320 may include a resource allocator 2321 .

The communication unit 2310 of the base station 2300 transmits signals such as PSS/SSS, a reference signal (RS), and data to the terminal, and receives data and channel feedback information from the terminal.

The control unit 2320 serves to generate a signal determined for each type and map it to a resource, and to map data of the terminal to a specific resource by using feedback information. To this end, the control unit 2320 may have a separate resource allocator 2321 or may perform a corresponding function as a part of the function of the control unit 2320 .

24 illustrates a process in which a terminal receives a beam reference signal (BRS) and transmits feedback information according to the present embodiments.

24, the terminal receives a beam reference signal (BRS) from the base station (S2400).

The UE checks the preferred OFDM symbols based on the RSRP or RSRQ value in the TBA subframe in which the beam reference signal (BRS) is received (S2420).

The terminal transmits radio resource management (RRM) information or channel state information (CSI) for an antenna port or antenna arrangement for preferred OFDM symbols to the base station (S2440).

For example, the terminal is a preferred antenna port or combination of antenna array indices based on RSRP or RSRQ values for beam reference signal (BRS) ports included in the preferred OFDM symbols and radio resource management (RRM) for it Information or feedback information such as channel state information (CSI) may be transmitted.

Alternatively, feedback information for all antenna ports or antenna arrays for indices of preferred OFDM symbols may be transmitted, or feedback information for a specific antenna port or specific antenna array may be transmitted.

Alternatively, feedback information for B antenna arrays or 2B antenna ports for indices of preferred OFDM symbols may be transmitted, where B is the number of beam reference signal (BRS) antenna ports identified in PBCH or RRC as 2 It may be a value divided by .

25 illustrates a process in which the base station receives feedback information from the terminal according to the present embodiments.

25, the base station transmits a beam reference signal (BRS) to the terminal (S2500), and feedback information such as radio resource management (RRM) information or channel state information (CSI) for the beam reference signal (BRS). Receive (S2520).

In this case, the base station may receive feedback information in a subframe appearing after the k-th in the subframe in which the beam reference signal (BRS) is transmitted, where k is a subframe when transmitting HARQ feedback for the data received by the terminal. It may be the same value as the difference of .

In addition, the base station may transmit a beam adjustment reference signal (BRRS) for adjusting a transmission beam transmitted to a specific terminal in the ultra-high frequency mobile communication system or a reception beam of the terminal to the terminal (S2540).

In this case, if the beam steering reference signal BRRS is scheduled in subframe n, the beam steering reference signal BRRS may be transmitted in the n+r-th subframe, where r is a fixed value such as 0 or a scheduled subframe. It may be a value determined according to the index of .

When the beam steering reference signal BRRS is transmitted in the n+r-th subframe, the base station may receive feedback information on the beam steering reference signal BRRS in the n+r+k'-th subframe (S2560).

Here, k' may be designed to have a fixed value, and the base station may adjust the transmit beam of the base station or the receive beam of the terminal based on feedback information on the beam steering reference signal (BRRS).

Standard contents or standard documents mentioned in the above-described embodiment are omitted to simplify the description of the specification and constitute a part of the present specification. Therefore, it should be construed as falling within the scope of the present invention to add the contents of the above standard content and some of the standard documents to the present specification or to be described in the claims.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims (36)

A method for a terminal to transmit feedback information in an ultra-high frequency mobile communication system, the method comprising:
receiving, by a terminal, a beam reference signal from a base station;
identifying a preferred symbol based on a reference signal reception power or a reference signal reception quality in a subframe in which the beam reference signal is received; and
Transmitting radio resource management information on a preferred antenna port or antenna arrangement based on a reference signal reception power or reference signal reception quality with respect to a beam reference signal port included in the preferred symbol to the base station,
Transmitting the radio resource management information to the base station,
The radio resource management information is transmitted in the K-th subframe from the subframe in which the beam reference signal is received, and K is a subframe in which the terminal receives data and a subframe in which feedback information for the data is transmitted. How it is set to a value equal to the difference.
According to claim 1,
Transmitting the radio resource management information to the base station,
A method of further transmitting, to the base station, channel state information on a preferred antenna port or antenna arrangement based on a reference signal reception power or a reference signal reception quality for a beam reference signal port included in the preferred symbol.
3. The method of claim 2,
Transmitting the radio resource management information to the base station,
A method of transmitting the radio resource management information or the channel state information for all antenna ports or all antenna arrays for the preferred symbol.
3. The method of claim 2,
Transmitting the radio resource management information to the base station,
Transmitting the radio resource management information or the channel state information for B antenna arrays or 2B antenna ports with respect to the preferred symbol, wherein B is a value obtained by dividing the number of the identified beam reference signal antenna ports by two.
3. The method of claim 2,
Transmitting the radio resource management information to the base station,
A method of transmitting the radio resource management information or the channel state information for one specific antenna array or one specific antenna port with respect to the preferred symbol.
delete According to claim 1,
receiving a beam steering reference signal from the base station; and
Further comprising the step of transmitting feedback information on the received beam steering reference signal to the base station,
The beam steering reference signal is scheduled in an N-th subframe and received in an N+R-th subframe, and the feedback information is transmitted in an N+R+K'-th subframe,
wherein N, R and K' are integers greater than or equal to 1.
8. The method of claim 7,
The R is a fixed value or a value determined according to the index of the scheduled subframe.
According to claim 1,
The step of the terminal receiving the beam reference signal from the base station,
A method of receiving the beam reference signal in 8 subcarriers consecutive in units of 12 subcarriers in a symbol in which the beam reference signal is transmitted and receiving another signal in the remaining 4 subcarriers.
A method for a base station to receive feedback information in an ultra-high frequency mobile communication system, the method comprising:
transmitting a beam reference signal to the terminal; and
In the subframe in which the beam reference signal is transmitted, the preferred antenna port based on the reference signal reception power or the reference signal reception quality with respect to the beam reference signal port included in the preferred symbol based on the reference signal reception power or the reference signal reception quality. or receiving radio resource management information for the antenna array,
Receiving the radio resource management information comprises:
The radio resource management information or channel state information is received in the K-th subframe from the subframe in which the beam reference signal is transmitted, and the K receives the subframe in which the base station transmits data and feedback information on the data. A method that is set to the same value as the difference between subframes.
11. The method of claim 10,
Receiving the radio resource management information comprises:
A method of further receiving the channel state information on a preferred antenna port or antenna arrangement based on a reference signal reception power or a reference signal reception quality with respect to a beam reference signal port included in the preferred symbol.
12. The method of claim 11,
Receiving the radio resource management information comprises:
A method of receiving the radio resource management information or the channel state information for all antenna ports or all antenna arrays for the preferred symbol.
12. The method of claim 11,
Receiving the radio resource management information comprises:
Receive the radio resource management information or the channel state information for B antenna arrays or 2B antenna ports with respect to the preferred symbol, wherein B is a value obtained by dividing the number of identified beam reference signal antenna ports by 2.
12. The method of claim 11,
Receiving the radio resource management information comprises:
A method of receiving the radio resource management information or the channel state information for one specific antenna array or one specific antenna port with respect to the preferred symbol.
delete 11. The method of claim 10,
transmitting a beam steering reference signal to the terminal; and
Further comprising the step of receiving feedback information on the transmitted beam steering reference signal,
The beam steering reference signal is scheduled in an N-th subframe and transmitted in an N+R-th subframe, and the feedback information is received in an N+R+K'-th subframe,
wherein N, R and K' are integers greater than or equal to 1.
17. The method of claim 16,
The R is a fixed value or a value determined according to the index of the scheduled subframe.
11. The method of claim 10,
Transmitting the beam reference signal to the terminal comprises:
A method of transmitting the beam reference signal on 8 consecutive subcarriers in units of 12 subcarriers in a symbol in which the beam reference signal is transmitted, and transmitting another signal on the remaining 4 subcarriers.
A terminal for transmitting feedback information in an ultra-high frequency mobile communication system, the terminal comprising:
a communication unit for receiving a beam reference signal transmitted by the base station; and
In the subframe in which the beam reference signal is received, the preferred antenna port based on the reference signal reception power or the reference signal reception quality with respect to the beam reference signal port included in the preferred symbol based on the reference signal reception power or the reference signal reception quality. or a control unit for generating feedback information including radio resource management information for the antenna array and transmitting the generated feedback information to the base station through the communication unit,
The control unit is
Transmits the feedback information including the radio resource management information or the channel state information in the K-th subframe from the subframe in which the beam reference signal is received through the communication unit, wherein K is the sub-frame in which the terminal receives data A terminal set to a value equal to the difference between a frame and a subframe transmitting feedback information for the data.
20. The method of claim 19,
The control unit is
A terminal for generating the feedback information further including the channel state information on the preferred antenna port or antenna arrangement based on the reference signal reception power or the reference signal reception quality with respect to the beam reference signal port included in the preferred symbol.
21. The method of claim 20,
The control unit is
A terminal for generating the feedback information including the radio resource management information or the channel state information for all antenna ports or all antenna arrays with respect to the preferred symbol.
21. The method of claim 20,
The control unit is
For the preferred symbol, generate the feedback information including the radio resource management information or the channel state information for B antenna arrays or 2B antenna ports, wherein B is the number of the identified beam reference signal antenna ports A terminal divided by two.
21. The method of claim 20,
The control unit is
A terminal for generating the feedback information including the radio resource management information or the channel state information for one specific antenna array or one specific antenna port with respect to the preferred symbol.
delete 20. The method of claim 19,
The communication unit,
receiving a beam steering reference signal from the base station and transmitting feedback information on the beam steering reference signal to the base station;
The beam steering reference signal is scheduled in an N-th subframe and received in an N+R-th subframe, and the feedback information is transmitted in an N+R+K'-th subframe,
wherein N, R and K' are integers greater than or equal to 1.
26. The method of claim 25,
The R is a fixed value or a value determined according to the index of the scheduled subframe.
20. The method of claim 19,
The communication unit,
A terminal for receiving the beam reference signal on 8 consecutive subcarriers in units of 12 subcarriers in a symbol in which the beam reference signal is transmitted and receiving other signals on the remaining 4 subcarriers.
A base station for receiving feedback information in a very high frequency mobile communication system, the base station comprising:
Transmitting a beam reference signal to the terminal and receiving reference signal reception power or reference signal for a beam reference signal port included in a preferred symbol based on reference signal reception power or reference signal reception quality in a subframe in which the beam reference signal is transmitted a communication unit configured to receive radio resource management information on a preferred antenna port or antenna array based on quality; and
A control unit for mapping data to be transmitted to the terminal to a specific resource using the received radio resource management information;
The communication unit,
The radio resource management information or channel state information is received in the K-th subframe from the subframe in which the beam reference signal is transmitted, and the K receives the subframe in which the base station transmits data and feedback information on the data. A base station set to the same value as the difference between the subframes.
29. The method of claim 28,
The communication unit,
The base station further receives the channel state information on the preferred antenna port or antenna arrangement based on the reference signal reception power or the reference signal reception quality with respect to the beam reference signal port included in the preferred symbol.
30. The method of claim 29,
The communication unit,
A base station for receiving the radio resource management information or the channel state information for all antenna ports or all antenna arrays for the preferred symbol.
30. The method of claim 29,
The communication unit,
The base station receives the radio resource management information or the channel state information for B antenna arrays or 2B antenna ports with respect to the preferred symbol, wherein B is a value obtained by dividing the number of identified beam reference signal antenna ports by two.
30. The method of claim 29,
The communication unit,
A base station for receiving the radio resource management information or the channel state information for one specific antenna array or one specific antenna port with respect to the preferred symbol.
delete 29. The method of claim 28,
The communication unit,
Transmitting a beam steering reference signal to the terminal and receiving feedback information on the transmitted beam steering reference signal,
The beam steering reference signal is scheduled in an N-th subframe and transmitted in an N+R-th subframe, and the feedback information is received in an N+R+K'-th subframe,
wherein N, R and K' are integers greater than or equal to 1;
35. The method of claim 34,
The R is a fixed value or a value determined according to the index of the scheduled subframe.
29. The method of claim 28,
The communication unit,
A base station for transmitting the beam reference signal on 8 consecutive subcarriers in units of 12 subcarriers in a symbol in which the beam reference signal is transmitted and transmitting other signals on the remaining 4 subcarriers.

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