WO2019168354A1 - Method by which terminal transmits srs in wireless communication system, and apparatus therefor - Google Patents

Abstract

Disclosed are a method by which a terminal transmits a sounding reference signal (SRS) in a wireless communication system, and an apparatus therefor. Particularly, the method performed by a terminal comprises the steps of: receiving SRS configuration information through higher layer signaling; and transmitting the SRS to a base station on the basis of the SRS configuration information, wherein the SRS configuration information includes information on usage of the SRS, and determines, on the basis of the information on the usage of the SRS, whether a guard period related to a plurality of SRS resources is used.

Description

[Correction 10.05.2019] [Article 26.10] Method for transmitting SRS by UE in wireless communication system and apparatus for same

The present invention relates to a wireless communication system, and more particularly, to a method for transmitting an SRS and an apparatus supporting the same.

Mobile communication systems have been developed to provide voice services while ensuring user activity. However, the mobile communication system has expanded not only voice but also data service, and the explosive increase in traffic causes shortage of resources and users require faster services. Therefore, a more advanced mobile communication system is required. .

The requirements of the next generation of mobile communication systems will be able to accommodate the explosive data traffic, dramatically increase the data rate per user, greatly increase the number of connected devices, very low end-to-end latency, and high energy efficiency. It should be possible. Dual connectivity, Massive Multiple Input Multiple Output (MIMO), In-band Full Duplex, Non-Orthogonal Multiple Access (NOMA), Super Various technologies such as wideband support and device networking have been studied.

The present specification proposes a method of transmitting a sounding reference signal (SRS) in a wireless communication system.

Specifically, the present specification proposes a method of determining whether to use a guard period between a plurality of SRS resources using information on the use of the SRS.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

The present specification proposes a method of transmitting a sounding reference signal (SRS) by a terminal in a wireless communication system. The method performed by the terminal includes receiving SRS configuration information through higher layer signaling and transmitting the SRS to a base station based on the SRS configuration information. The SRS configuration information includes information about the usage of the SRS, and based on the information about the usage of the SRS, determining whether to use a guard period associated with a plurality of SRS resources. It may be characterized by.

In addition, in the method of the present specification, the use of the SRS may be any one of a beam managemnet, a codebook, a non-codebook, and an antenna switching.

In addition, in the method of the present specification, when the SRS is set for the purpose of the beam management, whether or not to use the guard interval may be determined according to a beam management type.

In the method of the present specification, the beam management type is a type 1 indicating type of beam management for selecting a reception beam of a base station and a transmission beam of the terminal, and the reception beam of the base station. It may be one of a type 2 indicating beam management for selecting a type and a type 3 indicating beam management for selecting a transmission beam of the terminal.

Further, in the method of the present specification, when the beam management type is the type 1 or the type 3, the guard period may be set to be used for the plurality of SRS resources.

Further, in the method of the present specification, when the SRS is set for use of the codebook, the guard interval is set to be used for the plurality of SRS resources, and when the SRS is set for use of the non-codebook, The guard interval may be set not to be used for the plurality of SRS resources.

In addition, in a terminal for transmitting a sounding reference signal (SRS) in the wireless communication system of the present disclosure, the terminal includes a transceiver for transmitting and receiving a wireless signal, and a processor functionally connected to the transceiver, The processor may be configured to receive SRS configuration information through higher layer signaling and to transmit an SRS to a base station based on the SRS configuration information, wherein the SRS configuration information is used for the purpose of the SRS. and information about usage, and based on information about the use of the SRS, it may be characterized by determining whether to use a guard period associated with a plurality of SRS resources (resource).

In addition, in the terminal of the present specification, the use of the SRS may be any one of a beam managemnet, a codebook, a non-codebook, and an antenna switching.

Further, in the terminal of the present specification, when the SRS is set for the purpose of beam management, whether to use the guard period may be determined according to a beam management type.

Further, in the terminal of the present specification, the beam management type is a type 1 indicating type of beam management for selecting a reception beam of a base station and a transmission beam of the terminal, and the reception beam of the base station. It may be one of a type 2 indicating beam management for selecting a type and a type 3 indicating beam management for selecting a transmission beam of the terminal.

In addition, in the terminal of the present specification, when the beam management type is the type 1 or the type 3, the guard period may be configured to be used for the plurality of SRS resources.

Further, in the terminal of the present specification, when the SRS is set for the use of the codebook, the guard interval is set to be used for the plurality of SRS resources, when the SRS is set for the use of the non-codebook, The guard period may be set not to be used for the plurality of SRS resources.

According to an embodiment of the present invention, it is determined whether to use a guard period associated with a plurality of SRS resources in consideration of the usage of the SRS, and so on in terms of uplink resource utilization and / or implementation. There is an effect that can support the optimized SRS transmission.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description. .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the present invention, provide embodiments of the present invention and together with the description, describe the technical features of the present invention.

Figure 1 shows an example of the overall system structure of the NR to which the method proposed in this specification can be applied.

2 illustrates a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present specification may be applied.

3 shows an example of a frame structure in an NR system.

FIG. 4 shows an example of a resource grid supported by a wireless communication system to which the method proposed in this specification can be applied.

FIG. 5 shows examples of an antenna port and a number of resource grids based on each numerology to which the method proposed in this specification can be applied.

6 shows an example of a self-contained structure to which the method proposed in this specification can be applied.

7 is a diagram illustrating SRS resource indication for an aggregated SRS region.

8 is a diagram illustrating an example of determining an SRS resource location.

9 is a flowchart illustrating an operation of a terminal for transmitting a sounding reference signal (SRS) to which the method proposed in the present specification can be applied.

10 is a flowchart illustrating an operation of a base station transmitting a sounding reference signal (SRS) to which the method proposed in the present specification may be applied.

11 illustrates a block diagram of a wireless communication device to which the methods proposed herein can be applied.

12 illustrates a block diagram of a communication device according to an embodiment of the present invention.

FIG. 13 is a diagram illustrating an example of an RF module of a wireless communication device to which the method proposed in this specification can be applied.

14 is a diagram illustrating still another example of an RF module of a wireless communication device to which the method proposed in this specification can be applied.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details.

In some instances, well-known structures and devices may be omitted or shown in block diagram form centering on the core functions of the structures and devices in order to avoid obscuring the concepts of the present invention.

In this specification, a base station has a meaning as a terminal node of a network that directly communicates with a terminal. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. A base station (BS) is a fixed station, a Node B, an evolved-NodeB (eNB), a base transceiver system (BTS), an access point (AP), a general NB (generation NB) May be replaced by such terms. In addition, a 'terminal' may be fixed or mobile, and may include a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), and an AMS ( Advanced Mobile Station (WT), Wireless Terminal (WT), Machine-Type Communication (MTC) Device, Machine-to-Machine (M2M) Device, Device-to-Device (D2D) Device, etc.

Hereinafter, downlink (DL) means communication from a base station to a terminal, and uplink (UL) means communication from a terminal to a base station. In downlink, a transmitter may be part of a base station, and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal and a receiver may be part of a base station.

Specific terms used in the following description are provided to help the understanding of the present invention, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present invention.

The following techniques are code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and NOMA It can be used in various radio access systems such as non-orthogonal multiple access. CDMA may be implemented by a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA). UTRA is part of a universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink. LTE-A (advanced) is the evolution of 3GPP LTE.

5G NR defines Enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (MMTC), Ultra-Reliable and Low Latency Communications (URLLC), and vehicle-to-everything (V2X) according to usage scenarios.

The 5G NR standard is divided into standalone (SA) and non-standalone (NSA) according to co-existence between the NR system and the LTE system.

In addition, 5G NR supports various subcarrier spacings, and supports CP-OFDM in downlink, CP-OFDM and DFT-s-OFDM in uplink (SC-OFDM).

Embodiments of the present invention may be supported by standard documents disclosed in at least one of IEEE 802, 3GPP, and 3GPP2, which are wireless access systems. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.

For clarity, the following description focuses on 3GPP LTE / LTE-A / NR (New RAT), but the technical features of the present invention are not limited thereto.

As the spread of smart phones and IoT (Internet of Things) terminals is rapidly spreading, the amount of information exchanged through a communication network is increasing. As a result, next-generation wireless access technologies can provide faster service to more users than traditional communication systems (or traditional radio access technologies) (e.g., enhanced mobile broadband communication). )) Needs to be considered.

To this end, a design of a communication system considering a machine type communication (MTC) that provides a service by connecting a plurality of devices and objects has been discussed. In addition, a design of a communication system (eg, Ultra-Reliable and Low Latency Communication (URLLC)) that considers a service and / or terminal sensitive to communication reliability and / or latency is also considered. Is being discussed.

In the following specification, for convenience of description, the next generation radio access technology is referred to as NR (New RAT), and the radio communication system to which the NR is applied is referred to as an NR system.

Term Definition

eLTE eNB: An eLTE eNB is an evolution of an eNB that supports connectivity to EPC and NGC.

gNB: Node that supports NR as well as connection with NGC.

New RAN: A radio access network that supports NR or E-UTRA or interacts with NGC.

Network slice: A network slice defined by the operator to provide an optimized solution for specific market scenarios that require specific requirements with end-to-end coverage.

Network function: A network function is a logical node within a network infrastructure with well-defined external interfaces and well-defined functional behavior.

NG-C: Control plane interface used for the NG2 reference point between the new RAN and NGC.

NG-U: User plane interface used for the NG3 reference point between the new RAN and NGC.

Non-standalone NR: A deployment configuration where a gNB requires an LTE eNB as an anchor for control plane connection to EPC or an eLTE eNB as an anchor for control plane connection to NGC.

Non-Standalone E-UTRA: Deployment configuration in which the eLTE eNB requires gNB as an anchor for control plane connection to NGC.

User plane gateway: The endpoint of the NG-U interface.

System general

Figure 1 shows an example of the overall system structure of the NR to which the method proposed in this specification can be applied.

Referring to Figure 1, the NG-RAN consists of gNBs that provide control plane (RRC) protocol termination for the NG-RA user plane (new AS sublayer / PDCP / RLC / MAC / PHY) and UE (User Equipment). do.

The gNBs are interconnected via an X _n interface.

The gNB is also connected to the NGC via an NG interface.

More specifically, the gNB is connected to an Access and Mobility Management Function (AMF) through an N2 interface and to a User Plane Function (UPF) through an N3 interface.

NR (New Rat) Numerology and Frame Structure

)으로 스케일링(scaling) 함으로써 유도될 수 있다. 또한, 매우 높은 반송파 주파수에서 매우 낮은 서브캐리어 간격을 이용하지 않는다고 가정될지라도, 이용되는 뉴머롤로지는 주파수 대역과 독립적으로 선택될 수 있다.Multiple numerologies can be supported in an NR system. Here, the numerology may be defined by subcarrier spacing and cyclic prefix overhead. In this case, the plurality of subcarrier spacings may be defined as an integer N (or a basic subcarrier spacing).

Can be derived by scaling. Further, even if it is assumed that very low subcarrier spacing is not used at very high carrier frequencies, the used numerology may be selected independently of the frequency band.

In addition, in the NR system, various frame structures according to a number of numerologies may be supported.

Hereinafter, an Orthogonal Frequency Division Multiplexing (OFDM) neurology and frame structure that can be considered in an NR system will be described.

Multiple OFDM numerologies supported in the NR system may be defined as shown in Table 1.

의 시간 단위의 배수로 표현된다. 여기에서,

이고,

이다. 하향링크(downlink) 및 상향링크(uplink) 전송은

의 구간을 가지는 무선 프레임(radio frame)으로 구성된다. 여기에서, 무선 프레임은 각각

의 구간을 가지는 10 개의 서브프레임(subframe)들로 구성된다. 이 경우, 상향링크에 대한 한 세트의 프레임들 및 하향링크에 대한 한 세트의 프레임들이 존재할 수 있다.도 2는 본 명세서에서 제안하는 방법이 적용될 수 있는 무선 통신 시스템에서 상향링크 프레임과 하향링크 프레임 간의 관계를 나타낸다.With regard to the frame structure in the NR system, the size of the various fields in the time domain

Is expressed as a multiple of the time unit. From here,

ego,

to be. Downlink and uplink transmissions

It consists of a radio frame having a section of (radio frame). Here, each radio frame is

It consists of 10 subframes having a section of. In this case, there may be one set of frames for uplink and one set of frames for downlink. FIG. 2 illustrates an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present specification can be applied. Indicates a relationship between

이전에 시작해야 한다.As shown in FIG. 2, the transmission of an uplink frame number i from a user equipment (UE) is greater than the start of the corresponding downlink frame at the corresponding UE.

You must start before.

에 대하여, 슬롯(slot)들은 서브프레임 내에서

의 증가하는 순서로 번호가 매겨지고, 무선 프레임 내에서

의 증가하는 순서로 번호가 매겨진다. 하나의 슬롯은

의 연속하는 OFDM 심볼들로 구성되고,

는, 이용되는 뉴머롤로지 및 슬롯 설정(slot configuration)에 따라 결정된다. 서브프레임에서 슬롯

의 시작은 동일 서브프레임에서 OFDM 심볼

의 시작과 시간적으로 정렬된다.Numerology

For slots, slots within a subframe

Numbered in increasing order of within a radio frame

They are numbered in increasing order of. One slot is

Consists of consecutive OFDM symbols of,

Is determined according to the numerology and slot configuration used. Slot in subframe

Start of OFDM symbol in the same subframe

Is aligned with the beginning of time.

Not all terminals can transmit and receive at the same time, which means that not all OFDM symbols of a downlink slot or an uplink slot can be used.

), 무선 프레임 별 슬롯의 개수(

), 서브프레임 별 슬롯의 개수(

)를 나타내며, 표 3은 확장(extended) CP에서 슬롯 별 OFDM 심볼의 개수, 무선 프레임 별 슬롯의 개수, 서브프레임 별 슬롯의 개수를 나타낸다.Table 2 shows the number of OFDM symbols per slot in a normal CP.

), The number of slots per radio frame (

), The number of slots per subframe (

Table 3 shows the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.

=2인 경우, 즉 서브캐리어 간격(subcarrier spacing, SCS)이 60kHz인 경우의 일례로서, 표 2를 참고하면 1 서브프레임(또는 프레임)은 4개의 슬롯들을 포함할 수 있으며, 도 3에 도시된 1 서브프레임={1,2,4} 슬롯들은 일례로서, 1 서브프레임에 포함될 수 있는 스롯(들)의 개수는 표 2와 같이 정의될 수 있다.3 shows an example of a frame structure in an NR system. 3 is merely for convenience of description and does not limit the scope of the present invention.

= 2, i.e., when the subcarrier spacing (SCS) is 60 kHz, referring to Table 2, one subframe (or frame) may include four slots, which is illustrated in FIG. 1 subframe = {1,2,4} slots are one example, and the number of slot (s) that can be included in one subframe may be defined as shown in Table 2.

In addition, the mini-slot may consist of two, four or seven symbols, and may consist of more or fewer symbols.

In relation to physical resources in the NR system, an antenna port, a resource grid, a resource element, a resource block, a carrier part, etc. Can be considered.

Hereinafter, the physical resources that may be considered in the NR system will be described in detail.

First, with respect to the antenna port, the antenna port is defined so that the channel on which the symbol on the antenna port is carried can be inferred from the channel on which another symbol on the same antenna port is carried. If the large-scale property of the channel on which a symbol on one antenna port is carried can be deduced from the channel on which the symbol on another antenna port is carried, then the two antenna ports are quasi co-located or QC / QCL. quasi co-location relationship. Here, the wide range characteristics include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

FIG. 4 shows an example of a resource grid supported by a wireless communication system to which the method proposed in this specification can be applied.

서브캐리어들로 구성되고, 하나의 서브프레임이 142 ^μ OFDM 심볼들로 구성되는 것을 예시적으로 기술하나, 이에 한정되는 것은 아니다. Referring to Figure 4, the resource grid on the frequency domain

By way of example, one subframe consists of 142 ^μ OFDM symbols, but is not limited thereto.

서브캐리어들로 구성되는 하나 또는 그 이상의 자원 그리드들 및

의 OFDM 심볼들에 의해 설명된다. 여기에서,

이다. 상기

는 최대 전송 대역폭을 나타내고, 이는, 뉴머롤로지들뿐만 아니라 상향링크와 하향링크 간에도 달라질 수 있다.In an NR system, the transmitted signal is

One or more resource grids composed of subcarriers, and

Is described by the OFDM symbols of. From here,

to be. remind

Denotes the maximum transmission bandwidth, which may vary between uplink and downlink as well as numerologies.

및 안테나 포트 p 별로 하나의 자원 그리드가 설정될 수 있다.In this case, as shown in Figure 5, the numerology

And one resource grid for each antenna port p.

FIG. 5 shows examples of an antenna port and a number of resource grids based on each numerology to which the method proposed in this specification can be applied.

및 안테나 포트 p에 대한 자원 그리드의 각 요소는 자원 요소(resource element)로 지칭되며, 인덱스 쌍

에 의해 고유적으로 식별된다. 여기에서,

는 주파수 영역 상의 인덱스이고,

는 서브프레임 내에서 심볼의 위치를 지칭한다. 슬롯에서 자원 요소를 지칭할 때에는, 인덱스 쌍

이 이용된다. 여기에서,

이다.Numerology

And each element of the resource grid for antenna port p is referred to as a resource element and is an index pair

Uniquely identified by From here,

Is the index on the frequency domain,

Refers to the position of a symbol within a subframe. Index pair when referring to a resource element in a slot

This is used. From here,

to be.

및 안테나 포트 p에 대한 자원 요소

는 복소 값(complex value)

에 해당한다. 혼동(confusion)될 위험이 없는 경우 혹은 특정 안테나 포트 또는 뉴머롤로지가 특정되지 않은 경우에는, 인덱스들 p 및

는 드롭(drop)될 수 있으며, 그 결과 복소 값은

또는

이 될 수 있다.Numerology

Resource elements for antenna and antenna port p

Is a complex value

Corresponds to If there is no risk of confusion, or if no specific antenna port or numerology is specified, the indices p and

Can be dropped, so the complex value is

or

This can be

연속적인 서브캐리어들로 정의된다. In addition, the physical resource block (physical resource block) in the frequency domain

It is defined as consecutive subcarriers.

Point A serves as a common reference point of the resource block grid and can be obtained as follows.

OffsetToPointA for the PCell downlink indicates the frequency offset between the lowest subcarrier of the lowest resource block and point A overlapping with the SS / PBCH block used by the UE for initial cell selection, and a 15 kHz subcarrier spacing for FR1 and Expressed in resource block units assuming a 60 kHz subcarrier spacing for FR2;

absoluteFrequencyPointA indicates the frequency-location of point A expressed as in absolute radio-frequency channel number (ARFCN).

에 대한 주파수 영역에서 0부터 위쪽으로 넘버링(numbering)된다.Common resource blocks set subcarrier spacing

It is numbered from zero up in the frequency domain for.

에 대한 공통 자원 블록 0의 subcarrier 0의 중심은 'point A'와 일치한다. 주파수 영역에서 공통 자원 블록 번호(number)

와 서브캐리어 간격 설정

에 대한 자원 요소(k,l)은 아래 수학식 1과 같이 주어질 수 있다.Set subcarrier spacing

The center of the subcarrier 0 of the common resource block 0 with respect to 'point A'. Common resource block number in the frequency domain

And subcarrier spacing

The resource element (k, l) for may be given by Equation 1 below.

는 BWP의 번호이다. BWP i에서 물리 자원 블록

와 공통 자원 블록

간의 관계는 아래 수학식 2에 의해 주어질 수 있다.Here, k may be defined relative to point A such that k = 0 corresponds to a subcarrier centered on point A. Physical resource blocks are zero-based within the bandwidth part (BWP). Numbered until,

Is the number of the BWP. Physical resource blocks on BWP i

And common resource blocks

Can be given by Equation 2 below.

는 BWP가 공통 자원 블록 0에 상대적으로 시작하는 공통 자원 블록일 수 있다.From here,

May be a common resource block in which the BWP starts relative to common resource block 0.

Self-contained structure

The time division duplex (TDD) structure considered in the NR system is a structure that processes both uplink (UL) and downlink (DL) in one slot (or subframe). This is to minimize latency of data transmission in a TDD system, and the structure may be referred to as a self-contained structure or a self-contained slot.

6 shows an example of a self-contained structure to which the method proposed in this specification can be applied. 5 is merely for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 6, as in the case of legacy LTE, it is assumed that one transmission unit (eg, slot, subframe) includes 14 orthogonal frequency division multiplexing (OFDM) symbols.

In FIG. 6, an area 602 means a downlink control region, and an area 604 means an uplink control region. Also, an area other than the area 602 and the area 604 (that is, an area without a separate indication) may be used for transmitting downlink data or uplink data.

That is, uplink control information and downlink control information may be transmitted in one self-contained slot. On the other hand, in the case of data, uplink data or downlink data may be transmitted in one self-contained slot.

In the structure shown in FIG. 6, downlink transmission and uplink transmission are sequentially performed in one self-contained slot, and transmission of downlink data and reception of uplink ACK / NACK may be performed.

As a result, when an error in data transmission occurs, the time required for retransmission of data can be reduced. In this way, delays associated with data delivery can be minimized.

In the self-contained slot structure as shown in FIG. 6, a process of switching from a transmission mode to a reception mode by a base station (eNodeB, eNB, gNB) and / or a terminal (User Equipment) Alternatively, a time gap for switching from a reception mode to a transmission mode is required. In relation to the time gap, when uplink transmission is performed after downlink transmission in the self-contained slot, some OFDM symbol (s) may be set to a guard period (GP).

Analog beamforming

In a millimeter wave (mmWave, mmW) communication system, as the wavelength of a signal is shortened, multiple (or multiple) antennas may be installed in the same area. For example, in the 30CHz band, the wavelength is about 1cm, and when the antennas are installed at 0.5 lambda intervals on a panel of 5cm x 5cm according to the 2-dimension arrangement, a total of 100 Antenna elements may be installed.

Accordingly, in the mmW communication system, a method of increasing coverage or increasing throughput may be considered by increasing beamforming (BF) gain using a plurality of antenna elements.

At this time, when a TXRU (Transceiver Unit) is installed to enable transmission power and phase adjustment for each antenna element, independent beamforming is possible for each frequency resource.

However, the method of installing TXRU in all antenna elements (eg, 100 antenna elements) may be ineffective in terms of price. Accordingly, a method of mapping a plurality of antenna elements to one TXRU and controlling the direction of the beam by using an analog phase shifter may be considered.

Since the analog beamforming method as described above can generate only one beam direction in all bands, a problem arises in that the frequency selective beam operation cannot be performed.

Accordingly, hybrid beamforming with B TXRUs, which is less than Q antenna elements, may be considered as an intermediate form between digital beamforming and analog beamforming. In this case, although there is a difference depending on the connection scheme of the B TXRU and Q antenna elements, the direction of the beam capable of transmitting signals at the same time may be limited to B or less.

A terminal supporting partial reciprocity may acquire downlink (DL) channel state information (CSI) through transmission of a sounding reference signal (SRS) in a situation such as a time division duplex (TDD).

To this end, SRS transmission using tx antenna switching has been supported from Long-Term Evolution (LTE), and the technology can be supported from NR (New Radio).

In case of using antenna switching, a guard period may need to be generally set to about 15 ms between SRS resources in order to switch the tx antenna of the terminal. Here, the guard period may mean a resource (ie, a certain resource period) required to support antenna switching and the like.

In consideration of this, as an example, the length of the guard period (ie, the number of symbols) may be set in the NR system as shown in Table 4 below.

The guard period may vary depending on the parameter μ that determines the numerology (eg, subcarrier spacing, etc.). In this guard period, the terminal may be configured not to transmit any other signal.

That is, the guard period can be used completely for tx antenna switching.

In the case of Aperiodic SRS, intra-slot antenna switching may be supported in NR.

When the UE is configured / instructed to transmit aperiodic SRS with intra-slot antenna switching, the UE transmits SRS using different tx antennas for each designated SRS resource. The guard period described above may be provided between each resource.

However, in this case, the guard period described above may be set between SRS resources in one SRS resource set.

Therefore, a case where transmission of a plurality of preset SRS resources is impossible in one slot may occur.

For example, since the position where the SRS can be set in one slot is 6 symbols at the maximum from the end of the slot, the terminal has 1T4R case (ie, 1 tx antenna and 4 rx antennas) of 15 kHz subcarrier spacing (μ = 0). In this case, 4 1-symbol SRS resource + 3 1-symbol guard period may be required for antenna switching.

Therefore, in the 1T4R case of 15kHz subcarrier spacing, a total of 7 symbols are required, and thus, all of the SRS resource sets for corresponding antenna switching cannot be transmitted in one slot.

Such a phenomenon may be intensified as the guard period is increased to 2 symbols in the case of subcarrier spacing 120 kHz.

In addition, the use of similar guard periods for other use cases is discussed.

For example, a user equipment (UE) needs about 5 ms for the transition of tx power. For this reason, similar guard periods are required in the case of UL beam management using beams using different tx powers. In addition, a situation such as beam management in which beams using different tx antennas are used may be considered.

To solve this problem, if the base station instructs the terminal to transmit the Aperiodic SRS, and the SRS resources set in the designated SRS resource set can not be transmitted in one slot including a guard period, the terminal may transmit some SRS resources to another slot. have.

Hereinafter, in the present specification, a method of setting and / or determining a length of a guard interval, etc. when the guard interval is used and the guard interval (hereinafter, the first embodiment), and when the guard interval is set A method for performing SRS transmission (hereinafter, referred to as a second embodiment) is proposed in consideration of slots in which SRS resources are set.

Hereinafter, the embodiments described in this specification are only divided for convenience of description, and some methods and / or some configurations of one embodiment may be substituted with the methods and / or configurations of another embodiment, or may be applied in combination with each other. Of course.

(First embodiment)

First, a description will be given of a method of setting and / or determining a guard interval length (ie, the number of symbols of a guard interval) when the guard interval is used and / or when the guard interval is used in SRS transmission.

In particular, in the present specification, for convenience of description, 1) a method for setting and / or determining by a base station whether a guard interval is used and / or a guard interval length when a guard interval is used, and 2) a terminal is configured and And / or how to determine, and 3) how to set and / or determine according to a preset rule. However, this is only divided for convenience of description, and the configuration of any method may be substituted with the configuration of another method or may be applied in combination with each other.

(Method 1)

A method for setting and / or determining a guard interval length and the like when the BS uses a guard interval and / or when the guard interval is used will be described in detail.

The base station may directly set the guard period for each resource set or resource (between resources) and designate the terminal.

For example, the base station sets a 1 symbol guard period between 1-th SRS resource (or SRS resource set) and 2-th SRS resource, and between 2-th SRS resource and 3-th SRS resource. You can set a 2 symbol guard period. Hereinafter, the SRS resource may mean an SRS resource set.

Such a method may be implemented by setting the positions of the SRS resources at predetermined intervals and / or set / indicated intervals between the SRS resources included in the SRS resource set.

In addition, this may additionally inform the UE whether or not to use the corresponding guard period and / or the length of the guard period as MAC / DCI.

The method of setting / determining the position of the SRS resource will be described later.

In particular, this method, the base station sets the different guard period (set) to the terminal for better flexibility, and selects which of the additionally set guard period (set) to the terminal in the same way as MAC / DCI Can be used.

In this manner, the base station sets a multiple SRS resource set having a different guard period configuration to the terminal and selects an SRS resource set to be transmitted by the terminal through an aperiodic SRS trigger from among the multiple SRS resource sets.

In addition, the base station may identify the position of the SRS resources included in the SRS resource set through the symbol index and the guard period of the reference SRS resource.

For example, when the SRS resource set includes four SRS resources, one of the four SRS resources may be regarded as a reference SRS resource.

In this case, the base station may transmit a symbol index to the terminal for the reference SRS resource, and transmit a guard period.

The terminal may check the positions of the remaining three SRS resources included in the SRS resource set by shifting the guard period by the guard period from the position of the reference SRS resource specified by the reference SRS resource through the symbol index of the reference SRS resource.

In addition, when the guard period is received, the terminal may drop the corresponding SRS resource or shift the corresponding SRS resource when the position according to the symbol index of each of the SRS resources overlaps with the guard period.

(Method 2)

A method of setting and / or determining a guard interval length when the terminal uses a guard interval and / or when the guard interval is used will be described in detail.

The terminal may be configured to transmit the SRS with a guard period between SRS resources regardless of the base station. The terminal may not perform an additional operation on this.

The base station may perform blind detection by a method such as energy detection to determine whether the SRS is transmitted and the guard period is used for the corresponding symbol.

And / or, the terminal transmits the SRS with a guard period between SRS resources regardless of the base station. Next, the terminal may inform the base station of whether the guard period is used or / and the length of the guard period through the PUCCH / PUSCH.

And / or the UE may transmit the use of the guard period and / or the length of the guard period to the base station (recommend signal or request signal) when the guard period needs to be changed. The base station may check whether the guard period is used and / or the length of the guard period and feedback whether the terminal is allowed. Thereafter, when the guard period change is allowed, the terminal may transmit the SRS resource to the base station based on whether the corresponding guard period is used and / or the length of the guard period.

(Method 3)

It will be described in detail how the use of the guard interval and / or the guard interval length when using the guard interval is set and / or determined by a predetermined (or promised, defined) rule.

First, whether the guard interval is used and / or the guard interval length in the case of using the guard interval may be determined according to the use of the SRS (eg, RRC parameter usage, etc.).

The base station may set the use of the SRS resource set through the RRC parameter usage. The use of the SRS resource set (or SRS resource) may be selected from one of {Beam management, CodeBook, Non-CodeBook, Antenna switching}.

When the purpose of the SRS resource is set to beam management, different beams may be used between the SRS resources (for example, beam manage U1 / U3).

For example, the beam management may be one of type 1 (eg, U1 phase), type 2 (eg, U2 phase), and type 3 (eg, U3 phase).

Type 1 may mean a method of mutually selecting the rx / tx beam of the base station and the terminal. In this case, a guard period may be used because different beams are transmitted for each SRS resource.

Type 2 may mean a method of determining the rx beam of the base station. At this time, the tx beam of the terminal is maintained the same between the SRS resources. Thus guard periods may not be used.

Type 3 may mean a method of determining the tx beam of the terminal. In this case, a guard period may be used because different beams are transmitted for each SRS resource.

U2 and U3 may be distinguished by an RRC parameter SpatialRelationInfo.

SpatialRelationInfo is beam reference information set for each SRS resource. That is, it may be U3 when the SpatialRelationInfo is set differently for each SRS resource set included in the beam management resource set, and may be U2 when all are set the same.

In other words, when the SpatialRelationInfo of each of the SRS resource sets is different, a guard period may be applied. If the SpatialRelationInfo of each of the SRS resource sets is the same, the guard period may not be applied.

In addition, when at least one SpatialRelationInfo among SRS resources included in one beam management resource set is different, a guard period may be applied to the corresponding SRS resource. Or, in this case, the guard period may be applied only to adjacent SRS resources having different SpatialRelationInfo.

In addition, when the SpatialRelationInfo of adjacent SRS resource sets in the beam management resource set is the same, a guard period may be applied therebetween.

In addition, when the SRS is used for beam management, the length of the guard period may be determined using Table 4 as in the case of using the antenna switching.

In addition, when the SRS is used for the purpose of beam management, the length of the guard period may be determined by a table (a table predetermined for the purpose of beam management) to have a different length depending on the type of the beam management. Here, the type of beam management may mean a method of determining the rx beam of the base station and / or the tx beam of the terminal (eg, U1, U2, and U3).

In addition, the SRS resource may be set for the purpose of a codebook or a non-codebook.

When the SRS resource is set for the purpose of the codebook, a maximum of 2 SRS resources may be set in one SRS resource set. Since different tx beams may be used between each SRS resource, a guard period may be set.

When the SRS resource is set for use of a non-codebook, a maximum of 4 SRS resources may be set in one SRS resource set. Each resource represents a UL tx layer and thus is used in a situation in which the same beam is used. Thus, the guard period may not be used.

In addition, the SRS resource may be set for the purpose of antenna switching. When the SRS resource is set for the purpose of antenna switching, as described above, time may be required for the antenna transition. Therefore, the guard period described above may be used between the SRS resources included in the corresponding resource set.

And / or, whether or not to use the guard interval and / or the guard interval length in the case of using the guard interval may be determined according to the numerology set for the terminal.

In other words, different guard periods / lengths may be set / defined for different numerology according to the use of the above-described SRS.

For example, when tx power is set / instructed differently for each resource in addition to the tx antenna switching described above, about 5 kW may be required for adjusting the tx power. Thus, similarly, the guard period may be used (eg, SRS for beam management).

However, as described above, this may require less time than tx antenna switching. Therefore, when tx power is set / indicated differently for each resource, the length of the guard period may be 1 symbol regardless of numerology.

And / or, whether the guard interval is used and / or the guard interval length when the guard interval is used may be determined according to the relative position of the SRS with another channel and / or a reference signal (RS).

As described below, if some or all of the SRS resources are transmitted in a slot other than the slot designated as an aperiodic SRS offset (eg, a subsequent slot), the SRS resource transmitted in the corresponding slot and the PUSCH transmitted in the corresponding slot Guard periods may be used between (or PUCCH).

Herein, in the case of aperiodic, the offset may mean a slot offset from a slot (or symbol) triggered by downlink control information (DCI) to a slot (or symbol) in which a corresponding SRS resource is transmitted.

This operation may not be used in the slot designated as offset. This may be defined assuming that the UE preferentially transmits the SRS using the same antenna / beam as the PUSCH.

For example, when the slot offsets of the SRS and the PUSCH are non zero, a guard period may be set, and when the slot offset is zero, the SRS resource or the PUSCH may be dropped according to the priority between them.

Similarly, a guard period may necessarily be placed between the SRS and the PUCCH.

This guard period may take precedence over the SRS location (SRS resource location symbol index indicated by RRC) determined in other ways. In other words, if the guard period defined in this way and the SRS location overlap, the SRS is not transmitted in the symbol.

In this case, the SRS transmission may be dropped or the SRS resource may be mapped after the corresponding guard period.

Alternatively, if the guard period defined in this manner and the SRS location overlap, the corresponding SRS may be shifted or mapped immediately after the guard period.

And / or, whether or not to use the guard interval and / or the guard interval length when using the guard interval may be included in the configuration of the SRS resource set.

In detail, the above-described guard period may be defined to be allocated or arranged at a specific position in the SRS resource set.

For example, a guard period for changing the UE tx antenna may be included in the SRS resource set for beam management. This may be set in particular according to the number of tx / rx antennas of the terminal, and the guard period as many as the number of rx antennas / tx antenna-1 may be set in the SRS resource set. The number of SRS resources divided by each guard period may be equal to the number of tx antennas.

Accordingly, when the beam management is largely changed, a large value of the guard period may be applied, and when the beam management is small, a small value of the guard period may be applied to allow flexible operation.

And / or, whether or not to use the guard interval and / or the guard interval length in the case of using the guard interval may be determined according to the UE capability (UE capability). In this case, whether the guard interval is required as the capability information of the terminal may be reported to the base station. Such a scheme may be reported separately according to the above-described SRS usage, numerology and / or relative position.

In the present embodiment, the above-described methods may be equally used among all SRS resources set in the entire SRS resource set. Alternatively, the above-described methods may be used independently between resources for greater flexibility.

(Second embodiment)

Next, a method of performing SRS transmission in consideration of slots in which SRS resources are configured when a guard interval is set will be described. Specifically, when the above-described guard period is set, the actual transmission position of the SRS resource (particularly, to which slot corresponds to the slot corresponding to the designated SRS offset or to which slot thereafter) can be determined through the following methods.

In particular, in the present specification, for convenience of description, 1) a method for setting and / or determining a transmission position of an SRS resource according to a guard interval, 2) a method for setting and / or determining a terminal, and 3) a preliminary We will look into the method of setting and / or determining according to the set rules. However, this is only divided for convenience of description, and the configuration of any method may be substituted with the configuration of another method or may be applied in combination with each other.

(Method 1)

A method of setting and / or determining a transmission location of an SRS resource according to a guard interval will be described in detail.

First, an aggregated SRS region may be defined as a union of SRS regions in a multi-slot.

The base station may set the SRS resource location for the aggregated SRS region for the SRS resource (set) in which the guard period may be set.

7 is a diagram illustrating SRS resource indication for an aggregated SRS region.

For example, referring to FIG. 7, corresponding aggregated SRS regions 711 and 721 may be defined for two consecutive slots 710 and 720.

The SRS location may be selected as one of the 1st to 12th symbols instead of the existing 1st to 6th symbols from the end of slot.

When the UE uses the guard period according to the above-described scheme, the terminal may transmit the SRS at a location corresponding to the aggregated SRS resource location instead of the configured SRS resource location.

 In addition, the location setting for the SRS region of the single-slot may be omitted. In such a case, when the guard period is not used, the SRS resource location for the corresponding aggregated SRS region may be interpreted and transmitted as the SRS resource location for the single SRS region.

For example, if a 1 symbol SRS, 1 symbol guard period is set, and an SRS location is defined for a 2-slot aggregated SRS region, the actual SRS transmission when the guard period is not used is (configured SRS location) / 2. May be sent at a location such as

(Method 2)

A method of setting and / or determining a transmission location of an SRS resource according to a guard interval will be described in detail.

The UE transmits the SRS with a guard period between SRS resources regardless of the base station, and does not perform an additional operation.

The base station may perform blind detection by a method such as energy detection to determine whether the SRS is transmitted to the corresponding symbol.

Through this, the base station can determine whether the guard period is used.

And / or, the terminal may transmit the SRS with a guard period between SRS resources regardless of the base station. The terminal may inform the base station of the transmission location of each SRS resource through the PUCCH / PUSCH.

(Method 3)

The UE looks specifically at a method for setting and / or determining a transmission location of an SRS resource according to a guard interval by a preset (or promised, defined) rule.

The base station sets two or more SRS resources at the same location, and when the guard period is used, one of them may be transmitted to the SRS region of the next available UL slot. The position of the SRS resource in the slot may be a position set in the corresponding SRS resource. The SRS transmitted to the next slot may be an SRS resource having a larger SRS resource id. If the guard period is not used, one of the two SRS resources may not be transmitted. This SRS may be an SRS resource having a larger SRS resource id.

And / or an aggregated SRS region is defined as the union of the multi-slot SRS regions. The SRS resource location in the aggregated SRS region may be mapped according to the configured SRS resource location configured in the SRS region of 1 slot. In this case, the location of the i-th SRS resource is, for example, i-th SRS resource location in the aggregated SRS region = (i-1) -th SRS resource location in the aggregated SRS region + (i-1) -th SRS resource length + guard period between (i-1) -th and i-th can be represented as. And / or, when the length of the resource in the SRS resource set is x, the guard period is a y symbol, it can be briefly defined as follows.

Aggregated SRS location = configured SRS resource location * (x + y)

8 is a diagram illustrating an example of determining an SRS resource location according to the above-described scheme. 8 illustrates an SRS resource location in an SRS region 811 of 1-slot 810 and an SRS region 821 of 2-slot 820 when x = y = 1.

The guard period according to the first embodiment and / or the second embodiment described above may be equally applied to another channel or RS (eg, PUCCH, PUSCH, DMRS) and another channel or RS except for the SRS. In actual application of the above technology, it may be applied alone or in combination. In addition, the above patent has described the proposed method based on the 3GPP New RAT system for convenience of description, but the scope of the system to which the proposed method is applied is other than the 3GPP New RAT system (eg LTE, UTRA, etc.), in particular 5G and It can also be extended to the candidate technology.

9 is a flowchart illustrating an operation of a terminal for transmitting a sounding reference signal (SRS) to which the method proposed in the present specification can be applied. 9 is merely for convenience of description and does not limit the scope of the invention.

Referring to FIG. 9, it is assumed that a corresponding terminal and a base station perform SRS transmission and reception based on the above-described methods.

First, the terminal receives SRS configuration information through higher layer signaling (S910).

The SRS configuration information includes information on SRS usage (eg, RRC parameter srs-uage).

The use of the SRS may be any one of beam managemnet, codebook, non-codebook, and antenna switching.

Thereafter, the terminal transmits the SRS to the base station based on the SRS configuration information (S920).

In particular, the terminal may determine and / or set whether to use a guard period associated with a plurality of SRS resources based on the information about the SRS usage included in the SRS configuration information.

When the SRS is set for the purpose of the beam management, whether the guard period is used or not may be determined and / or set according to a beam management type.

In detail, the beam management type includes a type 1 for selecting a reception beam of a base station and a transmission beam of the terminal, a type 2 for selecting a reception beam of the base station, and a transmission beam of the terminal. It may be any one of type 3 to select.

Type 1 may mean a method of mutually selecting the rx / tx beam of the base station and the terminal. In the case of Type 1, a guard period may be used because different beams are transmitted for each SRS resource.

In the present specification, the use of the guard period may mean that the guard period is set and / or determined by the terminal.

In addition, type 2 may mean a method of determining the rx beam of the base station. At this time, the tx beam of the terminal is maintained the same between the SRS resources. Thus guard periods may not be used.

In the present specification, the use of the guard period may mean that the guard period is set and / or determined not to be used by the terminal.

In addition, type 3 may mean a method of determining the tx beam of the terminal.

In the case of type 3, a guard period may be used because different beams are transmitted for each SRS resource.

When the beam management type is the type 1 or the type 3, a guard period between the plurality of SRS resources may be used.

In addition, when the SRS is set for the purpose of the codebook, the guard interval is set for the plurality of SRS resources, and when the SRS is set for the purpose of the non-codebook, the guard interval is configured for the plurality of SRS resources. Can be set to not be used.

For example, in the case of a codebook, at most 2 SRS resources may be set in one SRS resource set. Since different tx beams may be used between each SRS resource, a guard period may be set.

In addition, in the case of a non-codebook, a maximum of 4 SRS resources may be set in one SRS resource set. Each resource represents a UL tx layer and thus is used in a situation in which the same beam is used. Thus, no guard period is used.

In addition, when the use of the SRS is set to antenna switching, as described above, the UE needs time for the antenna transition, and thus, the guard period may be used among the SRS resources included in the corresponding resource set.

In this regard, the above-described operation of the terminal may be specifically implemented by the terminal device 1120 illustrated in FIG. 11 of the present specification. For example, the above-described operation of the terminal may be performed by the processor 1121 and / or the RF unit 1123.

First, the processor 1121 receives SRS configuration information through higher layer signaling through the RF unit 1123 (S910).

The SRS configuration information includes information on SRS usage (eg, RRC parameter srs-uage).

The use of the SRS may be any one of beam managemnet, codebook, non-codebook, and antenna switching.

Thereafter, the processor 1121 transmits the SRS to the base station 1110 based on the SRS configuration information through the RF unit 1123 (S920).

In particular, the processor 1121 may determine and / or set whether to use a guard period associated with a plurality of SRS resources based on the information on the SRS usage included in the SRS configuration information. .

When the SRS is set for the purpose of the beam management, whether the guard period is used or not may be determined and / or set according to a beam management type.

In detail, the beam management type selects a reception beam of the base station 1110 and a transmission beam of the terminal 1120 and a reception beam of the base station 1110. One of Type 2 and Type 3 for selecting the transmission beam of the terminal 1120.

Type 1 may refer to a method of mutually selecting the rx / tx beam of the base station 1110 and the terminal 1120. In the case of Type 1, a guard period may be used because different beams are transmitted for each SRS resource.

In this specification, the use of the guard period may mean that the guard period is set and / or determined by the processor 1121.

In addition, type 2 may mean a method of determining the rx beam of the base station 1110. At this time, the tx beam of the terminal 1120 is maintained the same between SRS resources. Thus guard periods may not be used.

In the present specification, the deprecation of the guard period may mean that the guard period is set and / or determined not to be used by the processor 1121.

In addition, type 3 may refer to a method of determining the tx beam of the terminal 1120.

In the case of type 3, a guard period may be used because different beams are transmitted for each SRS resource.

When the beam management type is the type 1 or the type 3, a guard period between the plurality of SRS resources may be used.

In addition, when the SRS is set for the purpose of the codebook, the guard interval is set for the plurality of SRS resources, and when the SRS is set for the purpose of the non-codebook, the guard interval is configured for the plurality of SRS resources. Can be set to not be used.

For example, in the case of a codebook, at most 2 SRS resources may be set in one SRS resource set. Since different tx beams may be used between each SRS resource, a guard period may be set.

In addition, in the case of a non-codebook, a maximum of 4 SRS resources may be set in one SRS resource set. Each resource represents a UL tx layer and thus is used in a situation in which the same beam is used. Thus, no guard period is used.

In addition, when the use of the SRS is set to antenna switching, the processor 1121 needs a time for the antenna transition as described above, and thus, the processor 1121 is configured to use the aforementioned guard period among the SRS resources included in the corresponding resource set. You can decide.

10 is a flowchart illustrating an operation of a base station transmitting a sounding reference signal (SRS) to which the method proposed in the present specification may be applied.

10 is merely for convenience of description and does not limit the scope of the invention.

Referring to FIG. 10, it is assumed that a corresponding terminal and a base station perform SRS transmission and reception based on the above-described methods.

First, the base station transmits SRS configuration information through higher layer signaling (S1010).

The SRS configuration information includes information on SRS usage (eg, RRC parameter srs-uage).

The use of the SRS may be any one of beam managemnet, codebook, non-codebook, and antenna switching.

Thereafter, the base station receives the SRS from the terminal based on the SRS configuration information (S1020).

In particular, whether or not to use a guard period between a plurality of SRS resources may be determined by the terminal based on information on the use of the SRS.

Specifically, when it is set for the purpose of the beam management, whether or not to use the guard interval according to the beam management type (beam management type) can be determined. The beam management type includes a type 1 selecting a reception beam of a base station and a transmission beam of a terminal, a type 2 selecting a reception beam of a base station, and a type 3 selecting a transmission beam of a terminal. It can be either.

When the beam management type is the type 1 or the type 3, the guard period may be configured to be used for the plurality of SRS resources.

In addition, when the SRS is set for the purpose of the codebook, the guard interval is set to be used for the plurality of SRS resources, and when the SRS is set for the purpose of the non-codebook, the guard interval is the plurality of It may be set not to be used for SRS resources of.

In addition, when the use of the SRS is set to antenna switching, as described above, the UE needs time for the antenna transition, and thus, the guard period may be used among the SRS resources included in the corresponding resource set.

The operation of the base station shown in FIG. 10 is the same as that of the base station described with reference to FIGS.

In this regard, the above-described operation of the base station may be specifically implemented by the base station apparatus 1110 shown in FIG. 11 of the present specification. For example, the above-described operation of the base station may be performed by the processor 1111 and / or the RF unit 1113.

First, the processor 1111 transmits SRS configuration information through higher layer signaling through the RF unit 1113 (S1010).

The SRS configuration information includes information on SRS usage (eg, RRC parameter srs-uage).

The use of the SRS may be any one of beam managemnet, codebook, non-codebook, and antenna switching.

Thereafter, the processor 1111 receives the SRS from the terminal 1120 based on the SRS configuration information through the RF unit 1113 (S1020).

In particular, whether to use a guard period between a plurality of SRS resources may be determined and / or set by the processor 1121 of the terminal 1120 based on information on the use of the SRS.

Specifically, when it is set for the purpose of the beam management, whether or not to use the guard interval according to the beam management type (beam management type) may be determined and / or set. The beam management type includes a type 1 for selecting a reception beam of a base station 1110 and a transmission beam of a terminal 1120, a type 2 for selecting a reception beam of a base station 1110, and a terminal. It may be any one of type 3 for selecting the transmission beam of 1120.

When the beam management type is the type 1 or the type 3, the guard period may be set and / or determined to be used for the plurality of SRS resources by the processor 1121 of the terminal 1120.

In addition, when the SRS is set for the purpose of the codebook, the guard interval is set and / or determined to be used for the plurality of SRS resources by the processor 1121, and the SRS is set for the purpose of the non-codebook. In this case, the guard interval may be set and / or determined by the processor 1121 not to be used for the plurality of SRS resources.

In addition, when the use of the SRS is set to antenna switching, the processor 1121 of the terminal 1120 uses the guard period described above among the SRS resources included in the corresponding resource set since time is required for the antenna transition as described above. And / or determine to.

General apparatus to which the present invention can be applied

11 illustrates a block diagram of a wireless communication device to which the methods proposed herein can be applied.

Referring to FIG. 11, a wireless communication system includes a base station 1110 and a plurality of terminals 1120 located in an area of a base station 1110.

The base station 1110 includes a processor 1111, a memory 1112, and an RF unit 1113. The processor 1111 implements the functions, processes, and / or methods proposed in FIGS. 1 to 10. Layers of the air interface protocol may be implemented by the processor 1111. The memory 1112 is connected to the processor 1111 and stores various information for driving the processor 1111. The RF unit 1113 is connected to the processor 1111 to transmit and / or receive a radio signal.

The terminal 1120 includes a processor 1121, a memory 1222, and an RF unit 1223.

The processor 1121 implements the functions, processes, and / or methods proposed in FIGS. 1 to 10. Layers of the air interface protocol may be implemented by the processor 1121. The memory 1122 is connected to the processor 1121 and stores various information for driving the processor 1121. The RF unit 1123 is connected to the processor 1121 and transmits and / or receives a radio signal.

The memories 1112 and 1122 may be inside or outside the processors 1111 and 1121, and may be connected to the processors 1111 and 1121 by various well-known means.

In addition, the base station 1510 and / or the terminal 1520 may have a single antenna or multiple antennas.

Operations of the base station 1510 and / or the terminal 1520 illustrated in FIG. 11 are the same as those of the base station and / or the terminal described with reference to FIGS. 1 to 10, and thus a detailed operation method thereof will be omitted.

12 illustrates a block diagram of a communication device according to an embodiment of the present invention.

In particular, FIG. 12 is a diagram illustrating the terminal of FIG. 11 in more detail.

Referring to FIG. 12, the terminal may include a processor (or a digital signal processor (DSP) 1210, an RF module (or RF unit) 1235, a power management module 1205). ), Antenna 1240, battery 1255, display 1215, keypad 1220, memory 1230, SIM card Subscriber Identification Module card) 1225 (this configuration is optional), speaker 1245, and microphone 1250. The terminal may also include a single antenna or multiple antennas. Can be.

The processor 1210 implements the functions, processes, and / or methods proposed in FIGS. 1 to 10. The layer of the air interface protocol may be implemented by the processor 1210.

The memory 1230 is connected to the processor 1210 and stores information related to the operation of the processor 1210. The memory 1230 may be inside or outside the processor 1210 and may be connected to the processor 1210 by various well-known means.

The user enters command information, such as a telephone number, for example by pressing (or touching) a button on keypad 1220 or by voice activation using microphone 1250. The processor 1210 receives the command information, processes the telephone number, and performs a proper function. Operational data may be extracted from the SIM card 1225 or the memory 1230. In addition, the processor 1210 may display command information or driving information on the display 1215 for the user to recognize and for convenience.

The RF module 1235 is connected to the processor 1210 to transmit and / or receive an RF signal. The processor 1210 communicates command information to the RF module 1235 to transmit, for example, a radio signal constituting voice communication data to initiate communication. The RF module 1235 is composed of a receiver and a transmitter for receiving and transmitting a radio signal. The antenna 1240 functions to transmit and receive a radio signal. Upon receiving the wireless signal, the RF module 1235 may transmit the signal and convert the signal to baseband for processing by the processor 1210. The processed signal may be converted into audible or readable information output through the speaker 1245.

FIG. 13 is a diagram illustrating an example of an RF module of a wireless communication device to which the method proposed in this specification can be applied.

Specifically, FIG. 13 illustrates an example of an RF module that may be implemented in a frequency division duplex (FDD) system.

First, in the transmission path, the processor described in FIGS. 11 and 12 processes the data to be transmitted and provides an analog output signal to the transmitter 1310.

Within transmitter 1310, the analog output signal is filtered by a low pass filter (LPF) 1311 to remove images caused by digital-to-analog conversion (ADC), and an upconverter ( Up-converted from baseband to RF by a Mixer, 1312, and amplified by a Variable Gain Amplifier (VGA) 1313, the amplified signal is filtered by a filter 1314, and a power amplifier Further amplified by Amplifier (PA) 1315, routed through duplexer (s) 1350 / antenna switch (s) 1360, and transmitted via antenna 1370.

Also, in the receive path, the antenna receives signals from the outside and provides the received signals, which are routed through the antenna switch (s) 1360 / duplexers 1350 and provided to the receiver 1320. .

Within the receiver 1320, the received signals are amplified by a Low Noise Amplifier (LNA) 1323, filtered by a bandpass filter 1324, and received from RF by a down converter (Mixer, 1325). Downconvert to baseband.

The down-converted signal is filtered by a low pass filter (LPF) 1326 and amplified by VGA 1327 to obtain an analog input signal, which is provided to the processor described in FIGS. 11 and 12.

In addition, a local oscillator (LO) generator 1340 provides transmit and receive LO signals to the generate and up converter 1312 and down converter 1325, respectively.

Phase Locked Loop (PLL) 1330 also receives control information from the processor to generate transmit and receive LO signals at appropriate frequencies and provides control signals to LO generator 1340.

In addition, the circuits shown in FIG. 13 may be arranged differently from the configuration shown in FIG. 13.

14 is a diagram illustrating still another example of an RF module of a wireless communication device to which the method proposed in this specification can be applied.

Specifically, FIG. 14 illustrates an example of an RF module that may be implemented in a time division duplex (TDD) system.

The transmitter 1410 and receiver 1420 of the RF module in the TDD system have the same structure as the transmitter and receiver of the RF module in the FDD system.

Hereinafter, the RF module of the TDD system will be described only for the structure that differs from the RF module of the FDD system, and the description of the same structure will be described with reference to FIG. 13.

The signal amplified by the transmitter's power amplifier (PA) 1415 is routed through a band select switch (1450), a band pass filter (BPF) 1460, and antenna switch (s) 1470. And is transmitted through the antenna 1480.

In addition, in the receive path, the antenna receives signals from the outside and provides the received signals, which are routed through the antenna switch (s) 1470, the band pass filter 1460 and the band select switch 1450. To the receiver 1420.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. In addition, it is also possible to combine the some components and / or features to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment. It is obvious that the embodiments can be combined to form a new claim by combining claims which are not expressly cited in the claims or by post-application correction.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of a hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code may be stored in memory and driven by the processor. The memory may be located inside or outside the processor, and may exchange data with the processor by various known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential features of the present invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

The method of transmitting a SRS (sounding reference signal) in the wireless communication system of the present invention has been described with reference to the example applied to the 3GPP LTE / LTE-A system, 5G system (New RAT system), but also applied to various wireless communication systems It is possible to do

Claims (12)

In a method for transmitting a sounding reference signal (SRS) by a terminal in a wireless communication system, the method performed by the terminal, Receiving SRS configuration information through higher layer signaling; And Transmitting the SRS to a base station based on the SRS configuration information; The SRS configuration information includes information about the usage of the SRS, And determining whether to use a guard period associated with a plurality of SRS resources based on the information about the use of the SRS. The method of claim 1, The use of the SRS is any one of beam managemnet, codebook, non-codebook, and antenna switching. The method of claim 2, If the SRS is set for the purpose of the beam management, whether or not the guard interval is used according to the beam management type (beam management type). The method of claim 3, The beam management type includes a type 1 indicating beam management for selecting a reception beam of a base station and a transmission beam of the terminal, a type 2 indicating beam management for selecting a reception beam of the base station, and And a type 3 indicating beam management for selecting a transmission beam of the terminal. The method of claim 4, wherein If the beam management type is the type 1 or the type 3, the guard interval is set to be used for the plurality of SRS resources. The method of claim 2, If the SRS is set for the purpose of the codebook, the guard interval is set to be used for the plurality of SRS resources, If the SRS is set for use of the non-codebook, the guard interval is set not to be used for the plurality of SRS resources. A terminal for transmitting a sounding reference signal (SRS) in a wireless communication system, A transceiver for transmitting and receiving a wireless signal, A processor that is functionally connected to the transceiver; The processor, Receiving SRS configuration information through higher layer signaling and controlling to transmit the SRS to the base station based on the SRS configuration information; The SRS configuration information includes information about the usage of the SRS, And determining whether to use a guard period associated with a plurality of SRS resources based on the information about the use of the SRS. The method of claim 7, wherein The use of the SRS is a terminal of any one of beam management, codebook (codebook), non-codebook (non-codebook), and antenna switching (antenna switching). The method of claim 8, If the SRS is configured for the purpose of beam management, the guard interval is determined whether or not to use according to the beam management type (beam management type). The method of claim 9, The beam management type includes a type 1 indicating beam management for selecting a reception beam of a base station and a transmission beam of the terminal, a type 2 indicating beam management for selecting a reception beam of the base station, and A terminal of any one of type 3 representing beam management for selecting a transmission beam of the terminal. The method of claim 10, If the beam management type is the type 1 or the type 3, the guard interval is configured to be used for the plurality of SRS resources. The method of claim 8, When the SRS is set for the purpose of the codebook, the guard interval is set to be used for the plurality of SRS resources, and when the SRS is set for the purpose of the non-codebook, the guard interval is used for the plurality of SRS resources. Terminal that is disabled for use.

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