KR20210050984A - Resource usage measuring method and apparatus performing the same - Google Patents

Abstract

Disclosed are a resource usage amount measuring method and a device performing the same. According to an embodiment, the resource usage amount measuring method comprises the following steps of: measuring a resource usage amount of the frequency domain based on a demodulation reference signal (DM-RS) transmitted from a base station; and measuring a resource usage amount in the time domain based on the DM-RS.

Description

Resource usage measurement method and device that performs it {RESOURCE USAGE MEASURING METHOD AND APPARATUS PERFORMING THE SAME}

The following embodiments relate to a method of measuring resource usage and an apparatus for performing the same.

Since the commercialization of the 4G (4th generation) communication system, efforts have been made to develop a new 5G (5th generation) communication system to meet the increasing demand for wireless data traffic. The 5G communication system is called a beyond 4G network communication system, a post LTE system, or a new radio (NR) system. In order to achieve a high data rate, the 5G communication system includes a system operated using an ultra-high frequency (mmWave) band of 6 GHz or higher, and a communication system operated using a frequency band of 6 GHz or lower in terms of securing coverage. Including the implementation in the base station and the terminal is being considered.

The 3rd Generation Partnership Project (3GPP) NR system improves the spectrum efficiency of the network, enabling carriers to provide more data and voice services in a given bandwidth. Therefore, the 3GPP NR system is designed to meet the demand for high-speed data and media transmission in addition to supporting large-capacity voice. The advantage of the NR system is that it can have low operating costs with high throughput, low latency, frequency division duplex (FDD) and time division duplex (TDD) support, improved end-user environment and simple architecture on the same platform.

For more efficient data processing, the dynamic TDD of the NR system may use a method of varying the number of orthogonal frequency division multiplexing (OFDM) symbols that can be used for uplink and downlink according to the data traffic direction of users of the cell. For example, when the downlink traffic of the cell is more than the uplink traffic, the base station may allocate a plurality of downlink OFDM symbols to a slot (or subframe). Information on the slot configuration should be transmitted to the terminals.

Various attempts are being made to apply the 5G communication system to the IoT network. For example, technologies such as sensor network, machine to machine (M2M), and machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antenna, which are 5G communication technologies. As the big data processing technology described above, the cloud radio access network (cloud RAN) is also an example of the convergence of 5G technology and IoT technology. In general, mobile communication systems have been developed to provide voice services while ensuring user activity.

However, mobile communication systems are gradually expanding their range to not only voice but also data services, and have developed to the extent that they can provide high-speed data services. However, in a mobile communication system in which a service is currently provided, a more advanced mobile communication system is required due to a shortage of resources and a demand for a high-speed service from users.

In addition, in the context of providing services using multi-band multi-band frequency aggregation technology through 5G communication systems and providing commercial services that combine mobile communication IoT services with various industries, mobile data traffic is continuously increasing. In order to forecast and establish a future frequency allocation plan, a method of measuring the amount of frequency used in a specific frequency band in which the 5G communication system is being serviced is required.

Embodiments may provide a technique for measuring the amount of resources used by a base station in a wireless communication system.

A method for measuring resource usage according to an embodiment includes measuring resource usage in a frequency domain based on a demodulation reference signal (DM-RS) transmitted from a base station, and a time domain based on the demodulation reference signal (DM-RS). And measuring the resource usage of the.

The measuring of resource usage in the frequency domain includes: detecting the number of resource blocks included in a resource block group allocated for physical downlink shared channel (PDSCH) scheduling, and the resource It may include the step of checking whether the DM-RS is transmitted in a symbol in which the DM-RS is likely to be transmitted on a block group basis.

The detecting may include determining a configuration of a bandwidth part (BWP) used by the base station, and detecting the number of resource blocks included in a resource block group based on the configuration of the BWP.

The checking may include checking whether the DM-RS has been transmitted based on a correlation in units of the resource block.

The measuring of the frequency domain resource usage may include detecting an index of a first resource block allocated for physical downlink shared channel (PDSCH) scheduling and the number of consecutive resource blocks.

The measuring of resource usage in the time domain includes: detecting a DM-RS in a symbol, determining PDSCH scheduling allocation combinations based on an index of a symbol in which the DM-RS is detected, and among the combinations It may include determining a combination of symbols in which the DM-RS of the PDSCH is located.

The detecting may include monitoring symbols in which the DM-RS of the PDSCH may be located.

The determining may include determining the combination based on the received power of the symbols.

The determining may include determining the combination based on a constellation of a signal transmitted from the symbols.

An apparatus for measuring resource usage according to an embodiment includes a memory including instructions and a processor for executing the instructions, and when the instructions are executed by the processor, the processor includes a DM-RS transmitted from a base station. Resource usage in the frequency domain is measured based on the (demodulation reference signal), and resource usage in the time domain is measured based on the demodulation reference signal (DM-RS).

The processor detects the number of resource blocks included in a resource block group allocated for physical downlink shared channel (PDSCH) scheduling, and the DM-RS is transmitted in units of the resource block group. It is possible to check whether the DM-RS has been transmitted in a symbol that is likely to be.

The processor may determine a configuration of a bandwidth part (BWP) used by the base station and detect the number of resource blocks included in a resource block group based on the configuration of the BWP.

The processor may check whether the DM-RS has been transmitted based on a correlation in units of the resource block.

The processor may detect an index of a first resource block allocated for physical downlink shared channel (PDSCH) scheduling and the number of consecutive resource blocks.

The processor detects a DM-RS in a symbol, determines PDSCH scheduling allocation combinations based on the index of the symbol in which the DM-RS is detected, and a combination of symbols in which the DM-RS of the PDSCH is located among the combinations Can be judged.

The processor may monitor symbols in which the DM-RS of the PDSCH may be located.

The processor may determine the combination based on the received power of the symbols.

The processor may determine the combination based on a constellation of a signal transmitted from the symbols.

1 shows an example of a radio frame structure used in a wireless communication system.
2 shows an example of a structure of a resource grid of a 3GPP NR system.
3 is a diagram illustrating an example of a physical channel used in a 3GPP system and a general signal transmission method using the physical channel.
4A and 4B show an example of an SS/PBCH block for initial cell access in a 3GPP NR system.
5A is a flowchart illustrating an example of a procedure for transmission of control information and a control channel in a 3GPP NR system, and FIG. 5B is a diagram illustrating an example of transmission of control information and a control channel in a 3GPP NR system.
6 shows an example of a CORESET in which a PDCCH can be transmitted in a 3GPP NR system.
7 is a diagram illustrating an example of a method of setting a PDCCH search space in a 3GPP NR system.
8 is a diagram for describing an example of carrier aggregation.
9A is a diagram illustrating an example of a subframe structure of a single carrier, and FIG. 9B is a diagram illustrating an example of a subframe structure of a multicarrier.
10 is a diagram illustrating an example of a method to which a cross-carrier scheduling technique is applied.
11 is a schematic block diagram of a wireless communication system in which an apparatus for measuring resource usage according to an embodiment is implemented.
12 is a schematic block diagram of the device for measuring resource usage shown in FIG. 11.
FIG. 13 is a diagram for describing a method of measuring resource usage by the device for measuring resource usage according to FIG. 11.
14 is a detailed block diagram of the wireless communication system shown in FIG. 11.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, since various changes may be made to the embodiments, the scope of the patent application is not limited or limited by these embodiments. It is to be understood that all changes, equivalents, or substitutes to the embodiments are included in the scope of the rights.

The terms used in the examples are used for illustrative purposes only and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof does not preclude in advance. In addition, the limitations of "greater than" or "less than" based on a specific threshold value may be appropriately replaced with "greater than" or "less than", respectively, according to embodiments.

Terms such as first or second may be used to describe various elements, but the elements should not be limited by terms. The terms are only for the purpose of distinguishing one component from other components, for example, without departing from the scope of rights according to the concept of the embodiment, the first component may be named as the second component, and similarly The second component may also be referred to as a first component.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiment belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in the present application. Does not.

In addition, in the description with reference to the accompanying drawings, the same reference numerals are assigned to the same components regardless of the reference numerals, and redundant descriptions thereof will be omitted. In describing the embodiments, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the embodiments, the detailed description thereof will be omitted.

The terms used in the present specification have been selected as currently widely used general terms as possible while considering functions in the present invention, but this may vary according to the intention, custom, or the emergence of new technologies of technicians in the field. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, the meaning will be described in the description of the corresponding invention. Therefore, terms used in the present specification should be interpreted based on the actual meaning of the term and the entire contents of the present specification, not a simple name of the term.

The following embodiments include 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 the like. The same can be applied to various wireless access systems. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with a radio technology such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented with a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA). UTRA may be a part of 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 Advanced (LTE-A) may be an evolved version of 3GPP LTE. 3GPP NR (New Radio) is a system designed separately from LTE/LTE-A, and the requirements of IMT-2020 are eMBB (enhanced mobile broadband), URLLC (Ultra-Reliable and Low Latency Communication), and mMTC (massive machine type communication). ) It may be a system for supporting services. Hereinafter, for clear explanation, the description is based on 3GPP NR, but the technical idea of the present invention is not limited thereto.

Unless otherwise specified in the specification, a base station may include a next generation node B (gNB) defined in 3GPP NR. In addition, unless otherwise specified, the terminal may include user equipment (UE). Hereinafter, for better understanding, each content is separately divided into embodiments and described, but each of the embodiments may be used in combination with each other. Hereinafter, the configuration of the terminal may mean configuration by the base station. Specifically, the base station may transmit a channel or signal to the terminal to set an operation of the terminal or a parameter value used in a wireless communication system.

1 shows an example of a radio frame structure used in a wireless communication system.

Referring to FIG. 1, a radio frame (or radio frame) used in a 3GPP NR system may have a length _{of 10 ms (Δf max} N _f /100)T _{c ).} In addition, the radio frame may consist of 10 subframes (SF) of equal size. Here, Δf _max =480×103Hz, N _f =4096, T _c =1/(Δf _ref N _f,ref ), Δfref=15×103Hz, and N _f,ref =2048.

Each of the 10 subframes in one radio frame may be numbered from 0 to 9. Each subframe has a length of 1 ms, and may be composed of one or a plurality of slots according to subcarrier spacing.

Specifically, the subcarrier spacing that can be used in the 3GPP NR system is 15×2 ^μ kHz. Here, μ is a subcarrier spacing configuration, and μ may have a value of 0 to 4. That is, the subcarrier interval may be 15 kHz, 30 kHz, 60 kHz, 120 kHz, or 240 kHz.

A subframe of 1 ms length may consist ^{of 2 μ slots.} At this time, the length of each slot may be ^{2 -μ ms.} Each of the 2 ^μ slots in one subframe may be assigned a number from 0 to 2 ^{μ -1.}

Each of the slots in one radio frame may be assigned a number ^{from 0 to 10 × 2 μ -1.} The time resource may be classified by at least one of a radio frame number (or radio frame index), a subframe number (or subframe index), and a slot number (or slot index).

2 shows an example of a structure of a resource grid of a 3GPP NR system

In a wireless communication system, a downlink (DL) and/or uplink (UL) slot may include a resource grid having a structure as shown in FIG. 2.

In a wireless communication system, there may be one resource grid per antenna port.

The slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain, and may include a plurality of resource blocks (RBs) in the frequency domain. The OFDM symbol may mean one symbol period. Unless otherwise specified, an OFDM symbol may be referred to as a symbol. One resource block may include 12 consecutive subcarriers in the frequency domain.

개의 서브캐리어(subcarrier)와

개의 OFDM 심볼로 구성되는 자원격자로 표현될 수 있다. 여기서, 하향링크 자원 격자일 때, x=DL이고, 상향링크 자원 격자일 때, x=UL일 수 있다.

은 서브캐리어 간격 구성 인자 μ에 따른 자원 블록의 개수를 나타내고 x(DL 또는 UL)는

은 슬롯 내의 OFDM 심볼의 개수를 나타낼 수 있다.

는 하나의 자원 블록을 구성하는 서브캐리어의 개수로,

=12일 수 있다.The signal transmitted from each slot is

Subcarriers and

It can be represented by a resource grid consisting of four OFDM symbols. Here, in the case of a downlink resource grid, x=DL, and in the case of an uplink resource grid, x=UL.

Represents the number of resource blocks according to the subcarrier interval configuration factor μ, and x (DL or UL) is

May represent the number of OFDM symbols in the slot.

Is the number of subcarriers constituting one resource block,

May be =12.

The OFDM symbol may be referred to as a cyclic prefix OFDM (CP-OFDM) symbol or a discrete Fourier transform spread OFDM (DFT-S-OFDM) symbol according to a multiple access scheme.

The number of OFDM symbols included in one slot may vary according to the length of a cyclic prefix (CP). For example, in the case of a normal CP, one slot may include 14 OFDM symbols, and in the case of an extended CP, one slot may include 12 OFDM symbols. In a specific embodiment, the extended CP may be used only in a 60 kHz subcarrier interval.

In FIG. 2, for convenience of explanation, one slot is configured of 14 OFDM symbols, but embodiments of the present invention may be applied in the same manner to slots having different numbers of OFDM symbols.

개의 서브캐리어를 포함할 수 있다. 서브캐리어는 데이터 전송을 위한 데이터 서브캐리어, 참조 신호(reference signal)의 전송을 위한 참조 신호 서브캐리어, 및/또는 가드 밴드(guard band)를 포함할 수 있다. 캐리어 주파수는 중심 주파수(center frequency(f_c))라고 지칭될 수도 있다.Each OFDM symbol is in the frequency domain

It may include three subcarriers. The subcarrier may include a data subcarrier for data transmission, a reference signal subcarrier for transmission of a reference signal, and/or a guard band. The carrier frequency may also be referred to as a center frequency (f _{c ).}

개(예를 들어, 12개)의 연속하는 서브캐리어에 의해 정의될 수 있다. 하나의 OFDM 심볼과 하나의 서브캐리어로 구성된 자원을 자원 요소(resource element(RE)) 혹은 톤(tone)이라고 지칭할 수 있다. 따라서, 하나의 자원 블록은

개의 자원 요소로 구성될 수 있다.One resource block in the frequency domain

It can be defined by a number of (eg, 12) consecutive subcarriers. A resource composed of one OFDM symbol and one subcarrier may be referred to as a resource element (RE) or a tone. Thus, one resource block is

It can be composed of four resource elements.

까지 부여되는 인덱스이며, l은 시간 도메인에서 0부터

까지 부여되는 인덱스일 수 있다.Each resource element in the resource grid may be uniquely defined by an index pair (k, l) in one slot. k is from 0 in the frequency domain

Is an index given to, and l is from 0 in the time domain.

It can be an index that is given up to.

In order for the terminal to receive a signal from the base station or transmit a signal to the base station, the time/frequency synchronization of the terminal may be matched with the time/frequency synchronization of the base station. When the base station and the terminal are synchronized, time and frequency parameters required for the terminal to perform demodulation of the DL signal and transmission of the UL signal at an accurate time can be determined.

Each symbol of a radio frame operating in time division duplex (TDD) or unpaired spectrum is at least one of a downlink symbol, an uplink symbol, or a flexible symbol. It can be composed of either one.

A radio frame operating as a downlink carrier in a frequency division duplex (FDD) or paired spectrum may be composed of a downlink symbol and/or a flexible symbol, and a radio frame operating as an uplink carrier is an uplink It may be composed of a symbol and/or a flexible symbol.

Downlink transmission is possible in a downlink symbol, but uplink transmission is impossible. In an uplink symbol, uplink transmission is possible, but downlink transmission may not be possible. The flexible symbol may be used for downlink or uplink depending on a signal.

Information on the type of each symbol (for example, information on whether to indicate any one of a downlink symbol, an uplink symbol, and a flexible symbol) is a cell-specific (cell-specific or common) RRC (radio resource control) signal.

In addition, information on the type of each symbol may additionally be configured as a UE-specific or dedicated RRC signal.

The base station uses the cell-specific RRC signal: i) the period of the cell-specific slot configuration, ii) the number of slots having only downlink symbols from the beginning of the period of the cell-specific slot configuration, iii) the slot immediately following the slot having only the downlink symbols The number of downlink symbols from the first symbol, iv) the number of slots with only uplink symbols from the end of the period of the cell-specific slot configuration, v) the number of uplink symbols from the last symbol of the slot immediately preceding the slot with only uplink symbols. Can provide. Here, a symbol not composed of either an uplink symbol or a downlink symbol may be a flexible symbol.

When the information on the symbol type is composed of a UE-specific RRC signal, the base station may signal whether the flexible symbol is a downlink symbol or an uplink symbol with a cell-specific RRC signal. In this case, the UE-specific RRC signal cannot change a downlink symbol or an uplink symbol composed of a cell-specific RRC signal to another symbol type.

개의 심볼 중 하향링크 심볼의 수 및/또는 상향링크 심볼의 수를 시그널링할 수 있다. 이때, 슬롯의 하향링크 심볼은 슬롯의 첫 심볼부터 i번째 심볼까지 연속적으로 구성될 수 있다. 또한, 슬롯의 상향링크 심볼은 슬롯의 j번째 심볼부터 마지막 심볼까지 연속적으로 구성될 수 있다(여기서, i<j). 슬롯에서 상향링크 심볼과 하향링크 심볼 어느 것으로도 구성되지 않은 심볼은 플랙서블 심볼일 수 있다.The UE-specific RRC signal is for each slot.

The number of downlink symbols and/or the number of uplink symbols among the symbols may be signaled. In this case, the downlink symbol of the slot may be continuously configured from the first symbol to the i-th symbol of the slot. In addition, the uplink symbol of the slot may be continuously configured from the j-th symbol to the last symbol of the slot (here, i<j). A symbol not composed of either an uplink symbol or a downlink symbol in a slot may be a flexible symbol.

Information on the type of a symbol composed of an RRC signal as described above may be referred to as a semi-static DL/UL configuration. In a semi-static DL/UL configuration composed of an RRC signal, a flexible symbol is a downlink symbol and an uplink symbol through dynamic slot format information (SFI) transmitted through a physical downlink control channel (PDCCH). , And/or may be indicated by a flexible symbol. At this time, the downlink symbol or uplink symbol composed of the RRC signal is not changed to another symbol type. An example of the dynamic SFI that the base station can indicate to the terminal may be shown in Table 1.

In Table 1, D represents a downlink symbol, U represents an uplink symbol, and X represents a flexible symbol. DL/UL switching can be allowed up to two times in one slot.

3 is a diagram illustrating an example of a physical channel used in a 3GPP system and a general signal transmission method using the physical channel.

The 3GPP system may be, for example, an NR system.

When the power of the terminal increases or the terminal newly enters the cell, the terminal may perform an initial cell search operation (S101). Specifically, the terminal can synchronize with the base station in initial cell search. To this end, the terminal may receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and obtain information such as a cell ID. Thereafter, the terminal may receive the physical broadcast channel from the base station to obtain broadcast information in the cell.

After completing the initial cell search, the UE acquires through initial cell search by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to the information carried on the PDCCH. It is possible to obtain more specific system information than one system information (S102). Here, the system information received by the UE is cell-common system information for the UE to properly operate in the physical layer of the RRC, and Remaining system information or System information block (SIB) ) May be referred to.

When the terminal accesses the base station for the first time or there is no radio resource for signal transmission (eg, when the terminal is in the RRC_IDLE mode), the terminal may perform a random access process with the base station (S103 to S106).

The UE may transmit a preamble through a physical random access channel (PRACH) (S103) and receive a response message to the preamble through a PDCCH and a corresponding PDSCH from the base station (S104).

When the terminal receives a valid random access response message, the terminal transmits data including its own identifier, etc. through a physical uplink shared channel (PUSCH) indicated by an uplink grant transmitted from the base station through the PDCCH. It can be transmitted to the base station (S105).

Next, the terminal waits for the reception of the PDCCH as an indication of the base station for collision resolution, and when the terminal successfully receives the PDCCH through its identifier (S106), the random access process may be terminated.

During the random access process, the UE may acquire UE-specific system information necessary for the UE to properly operate at the physical layer in the RRC layer. When the terminal obtains terminal-specific system information from the RRC layer, the terminal may enter an RRC connection mode (RRC_CONNECTED mode).

The RRC layer may be used for message generation and management for control between a terminal and a radio access network (RAN). For example, in the RRC layer, the base station and the terminal broadcast the cell system information necessary for all terminals in the cell, manage the delivery of paging messages, manage mobility and handover, and report the measurement of the terminal and control it. , Storage management including terminal capability management and/or security management (eg, key management) may be performed.

In general, since the update of the signal (hereinafter, referred to as RRC signal) transmitted from the RRC layer is longer than the transmission time interval (TTI) in the physical layer, the RRC signal can be maintained unchanged for a long period. .

After the above-described procedures (S101 to S106), the UE receives PDCCH/PDSCH (S107) and physical uplink shared channel (PUSCH)/physical uplink control channel as a general uplink/downlink signal transmission procedure. Uplink control channel (PUCCH)) may be transmitted (S108).

The UE may receive downlink control information (DCI) through the PDCCH. DCI may include control information such as resource allocation information for the terminal.

The format of DCI may vary depending on the purpose of use. Uplink control information (UCI) transmitted by the UE to the base station through the uplink includes a downlink/uplink ACK/NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), and a rank (RI). indicator) and the like. Here, CQI, PMI, and RI may be included in channel state information (CSI).

In the case of a 3GPP NR system, the UE may transmit control information such as HARQ-ACK and CSI described above through PUSCH and/or PUCCH.

4A and 4B show an example of an SS/PBCH block for initial cell access in a 3GPP NR system.

When the terminal is powered on or newly accesses a cell, the terminal may acquire time and frequency synchronization with the cell and perform an initial cell search process. The UE may detect the ^cell's _{physical cell identity (N cell ID} ) during the cell search process.

The terminal may receive a synchronization signal from the base station and synchronize with the base station. In this case, the terminal may obtain information such as a cell identifier (identity (ID)).

The synchronization signal SS may be divided into a main synchronization signal PSS and a sub synchronization signal SSS.

PSS may be used to obtain time domain synchronization and/or frequency domain synchronization such as OFDM symbol synchronization and slot synchronization. SSS can be used to obtain frame synchronization and cell group ID.

4A and 2, the SS/PBCH block is composed of 20 RBs (for example, 240 subcarriers) consecutive in the frequency axis, and may be composed of 4 OFDM symbols consecutive in the time axis. .

In this case, in the SS/PBCH block, the PSS may be transmitted through the first OFDM symbol, and the SSS may be transmitted through the 56th to 182th subcarriers in the third OFDM symbol. Here, the lowest subcarrier index of the SS/PBCH block may be assigned from 0.

The base station may not transmit a signal through the remaining subcarriers, that is, 0 to 55 and 183 to 239 th subcarriers in the first OFDM symbol in which the PSS is transmitted. In addition, the base station may not transmit a signal through the 48th to 55th and 183th to 191th subcarriers in the third OFDM symbol in which the SSS is transmitted.

The base station may transmit a physical broadcast channel (PBCH) through the remaining REs except for the above signal in the SS/PBCH block.

SS is a total of 1008 unique physical layer cell identifiers through a combination of three PSSs and SSSs, so that each physical layer cell identifier is part of only one physical-layer cell-identifier group, so that each group is three unique. It may be grouped into 336 physical-layer cell-identifier groups including one identifier.

Therefore, the physical layer cell ID N ^cell _ID = 3N ⁽¹⁾ _ID + N ⁽²⁾ _ID ^{is an index N (1)} _ID in the range from 0 to 335 representing a physical-layer cell-identifier group and the physical-layer cell -It can be uniquely defined by ^{the index N (2)} _ID from 0 to 2 indicating the physical-layer identifier in the identifier group.

The UE can detect the PSS and identify one of the three unique physical-layer identifiers. In addition, the terminal may detect the SSS and identify one of 336 physical layer cell IDs associated with the physical-layer identifier.

In this case, the sequence d _PSS (n) of the PSS can be expressed as in Equation 1.

이고,

일 수 있다.here,

ego,

Can be

In addition, the sequence d _SSS (n) of the SSS can be expressed as in Equation 2.

이고,

일 수 있다.here,

ego,

Can be

A 10ms long radio frame can be divided into two 5ms long half frames. 4B shows a slot in which an SS/PBCH block is transmitted in a half frame.

The slot in which the SS/PBCH block is transmitted may be any one of Cases A, B, C, D, and E.

In Case A, the subcarrier interval is 15 kHz, and the start time of the SS/PBCH block may be {2, 8} + 14n-th symbol. At this time, it may be n=0, 1 at a carrier frequency of 3 GHz or less. In addition, it may be n = 0, 1, 2, 3 at a carrier frequency of more than 3 GHz and less than 6 GHz.

In Case B, the subcarrier interval is 30 kHz, and the start time of the SS/PBCH block may be {4, 8, 16, 20} + 28n-th symbol. In this case, n may be 0 at a carrier frequency of 3 GHz or less. In addition, it may be n = 0, 1 at a carrier frequency of more than 3 GHz and less than 6 GHz.

In Case C, the subcarrier interval is 30 kHz, and the start time of the SS/PBCH block may be {2, 8} + 14n-th symbol. At this time, it may be n=0, 1 at a carrier frequency of 3 GHz or less. In addition, it may be n = 0, 1, 2, 3 at a carrier frequency of more than 3 GHz and less than 6 GHz.

In Case D, the subcarrier interval is 120 kHz, and the start time of the SS/PBCH block may be {4, 8, 16, 20} + 28n-th symbol. In this case, n=0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18 at a carrier frequency of 6 GHz or higher.

In Case E, the subcarrier interval is 240 kHz, and the start time of the SS/PBCH block may be {8, 12, 16, 20, 32, 36, 40, 44} + 56n-th symbol. In this case, n=0, 1, 2, 3, 5, 6, 7, 8 at a carrier frequency of 6 GHz or higher.

5A is a flowchart illustrating an example of a procedure for transmission of control information and a control channel in a 3GPP NR system, and FIG. 5B is a diagram illustrating an example of transmission of control information and a control channel in a 3GPP NR system.

The base station may add a cyclic redundancy check (CRC) masked (eg, XOR operation) with a radio network temporary identifier (RNTI) to control information (eg, DCI) (S902). The base station may scramble the CRC with an RNTI value determined according to the purpose/target of each control information.

The common RNTI used by one or more terminals is at least one of system information RNTI (SI-RNTI), paging RNTI (P-RNTI), random access RNTI (RA-RNTI), and transmit power control RNTI (TPC-RNTI). Can include. In addition, the terminal-specific RNTI may include at least one of a cell temporary RNTI (C-RNTI) and a CS-RNTI.

After performing channel encoding (eg, polar coding) (S204), the base station may perform rate-matching according to the amount of resources used for PDCCH transmission (S906).

The base station may multiplex DCI based on a PDCCH structure based on a control channel element (CCE) (S208). In addition, the base station may apply an additional process (S210) such as scrambling, modulation (eg, QPSK), and interleaving to the multiplexed DCI, and then map it to a resource to be transmitted.

CCE is a basic resource unit for the PDCCH, and one CCE may be composed of a plurality of (eg, 6) resource element groups (REGs). One REG may consist of a plurality (eg, 12) of REs.

The number of CCEs used for one PDCCH may be defined as an aggregation level. Aggregation levels of 1, 2, 4, 8 or 16 can be used in the 3GPP NR system.

5B is a diagram for multiplexing of a CCE aggregation level and a PDCCH, and shows the types of CCE aggregation levels used for one PDCCH and CCE(s) transmitted in a control region according thereto.

6 shows an example of a CORESET in which a PDCCH can be transmitted in a 3GPP NR system.

CORESET (control resource set) may be a time-frequency resource in which the PDCCH, which is a control signal for the terminal, is transmitted. A search space to be described later may be mapped to one CORESET. Accordingly, the UE may decode the PDCCH mapped to the CORESET by monitoring the time-frequency region designated as CORESET instead of monitoring all frequency bands for PDCCH reception.

The base station may configure one or a plurality of CORESET for each cell to the terminal. CORESET can consist of up to 3 consecutive symbols on the time axis. In addition, CORESET may be configured in units of six consecutive physical resource blocks (PRBs) on the frequency axis.

CORESET#1 is composed of continuous PRBs, and CORESET#2 and CORESET#3 are composed of discontinuous PRBs. CORESET can be placed on any symbol in the slot. For example, CORESET#1 may start at the first symbol of the slot, CORESET#2 may start at the 5th symbol of the slot, and CORESET#9 may start at the 9th symbol of the slot.

7 is a diagram illustrating an example of a method of setting a PDCCH search space in a 3GPP NR system.

At least one search space may exist in each CORESET in order to transmit the PDCCH to the UE. The search space is a set of all time-frequency resources (hereinafter, PDCCH candidates) to which the PDCCH of the UE can be transmitted.

The search space may include a common search space to be searched for by a UE of 3GPP NR and a terminal-specific search space to be searched for by a specific UE (Terminal-specific search space or UE-specific search space). .

In the common search space, it is possible to monitor the PDCCH, which is configured so that all terminals in a cell belonging to the same base station search in common. In addition, the terminal-specific search space may be set for each terminal so that the PDCCH allocated to each terminal can be monitored at different search space positions according to the terminal.

The UE-specific search space may be allocated because the search space between UEs partially overlaps due to a limited control region to which the PDCCH can be allocated. Monitoring the PDCCH may include blind decoding PDCCH candidates in the search space.

When blind decoding is successful, the PDCCH is (successfully) detected/received, and when blind decoding is failed, the PDCCH is not detected/received, or successfully detected/received.

For convenience of description below, a PDCCH scrambled with a group common (GC) RNTI already known by one or more terminals in order to transmit downlink control information to one or more terminals is referred to as a group common PDCCH or a common PDCCH. .

In addition, in order to transmit uplink scheduling information or downlink scheduling information to one specific terminal, a PDCCH scrambled with a terminal-specific RNTI already known by a specific terminal is referred to as a terminal-specific PDCCH.

The common PDCCH may be included in the common discovery space, and the UE-specific PDCCH may be included in the common discovery space and/or the UE-specific PDCCH.

The base station allocates information related to resource allocation of a paging channel (PCH) and a downlink-shared channel (DL-SCH), which are transmission channels, through the PDCCH (eg, DL Grant) or resource allocation of an uplink-shared channel (UL-SCH). And information (eg, UL grant) related to hybrid automatic repeat request (HARQ) may be notified to each terminal or terminal group.

The base station may transmit the PCH transport block and the DL-SCH transport block through the PDSCH. The base station may transmit specific control information or data excluding specific service data through the PDSCH. In addition, the terminal may receive data excluding specific control information or specific service data through the PDSCH.

The base station may transmit information on which terminal (one or more terminals) the PDSCH data is transmitted to and how the corresponding terminal should receive and decode the PDSCH data in the PDCCH.

For example, DCI transmitted through a specific PDCCH is CRC masked with an RNTI of "A", and the DCI indicates that a PDSCH is allocated to a radio resource (eg, a frequency location) of "B", Assuming that "C" indicates transmission format information (eg, transport block size, modulation method, coding information, etc.), the UE monitors the PDCCH using RNTI information it has. In this case, if there is a UE that blindly decodes the PDCCH using the “A” RNTI, the UE may receive the PDCCH and receive the PDSCH indicated by “B” and “C” through the received PDCCH information. have.

Table 3 shows an example of a PUCCH used in a wireless communication system.

PUCCH can be used to transmit uplink control information (UCI). Uplink control information may include SR (Scheduling Request), HARQ-ACK, and/or CSI (Channel State Information).

SR (Scheduling Request) may be information used to request an uplink UL-SCH resource.

HARQ-ACK may be a response to a PDCCH (indicating DL SPS release) and/or a response to a downlink transport block (TB) on the PDSCH. HARQ-ACK may indicate whether the reception of information transmitted through the PDCCH or PDSCH is successful. The HARQ-ACK response may include positive ACK (hereinafter, ACK), negative ACK (hereinafter, NACK), discontinuous transmission (DTX), and/or NACK/DTX. HARQ-ACK may be referred to interchangeably as HARQ-ACK/NACK and/or ACK/NACK. ACK may be expressed as a bit value of 1 and NACK may be expressed as a bit value of 0.

Channel State Information (CSI) may be feedback information on a downlink channel. The terminal can be generated based on the CSI-RS (Reference Signal) transmitted by the base station. Feedback information related to multiple input multiple output (MIMO) may include a rank indicator (RI) and a precoding matrix indicator (PMI). CSI may be divided into CSI Part 1 and CSI Part 2 according to information indicated by CSI.

In the 3GPP NR system, five PUCCH formats may be used to support various service scenarios, various channel environments, and frame structures.

PUCCH format 0 may be a format capable of carrying 1-bit or 2-bit HARQ-ACK information or SR.

PUCCH format 0 may be transmitted through one or two OFDM symbols on the time axis and one PRB on the frequency axis. When PUCCH format 0 is transmitted in two OFDM symbols, the same sequence may be transmitted in different RBs in the two symbols. In this case, the sequence may be a sequence that is cyclic shifted (CS) from a base sequence used in PUCCH format 0. Through this, the terminal can obtain a frequency diversity gain.

Specifically, the UE may determine a cyclic shift (CS) value m _{cs according to the M bit bit UCI (1 or 2).} In addition, a sequence obtained by cyclic shifting a base sequence of length 12 based on a predetermined CS value m _cs may be mapped to 1 OFDM symbol and 12 REs of 1 RB and transmitted.

When the number of cyclic shifts available to the UE is 12 and M _bit = 1, 1 bit UCI 0 and 1 may be mapped to two cyclic shifted sequences having a difference of 6 cyclic shift values, respectively. In addition, when M _bit = 2, 2 bits UCI 00, 01, 11, and 10 may be mapped to four cyclic shifted sequences in which the difference between the cyclic shift values is 3, respectively.

PUCCH format 1 may carry 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 may be transmitted through consecutive OFDM symbols on the time axis and one PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 may be one of 4 to 14.

Specifically, UCI with M _bit = 1 can be modulated with BPSK. The UE may _{modulate the UCI of M bit} = 2 with quadrature phase shift keying (QPSK). A signal is obtained by multiplying the modulated complex valued symbol d(0) by a sequence of length 12. In this case, the sequence may be a base sequence used for PUCCH format 0. The terminal transmits the obtained signal by spreading the obtained signal on the even-numbered OFDM symbol to which the PUCCH format 1 is allocated using a time axis orthogonal cover code (OCC). In PUCCH format 1, the maximum number of different terminals multiplexed with the same RB is determined according to the length of the OCC used. The odd-numbered OFDM symbols of PUCCH format 1 may be mapped by spreading a demodulation reference signal (DMRS) to OCC.

PUCCH format 2 can carry UCI in excess of 2 bits. PUCCH format 2 may be transmitted through one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. When PUCCH format 2 is transmitted in two OFDM symbols, the same sequence may be transmitted in different RBs through two OFDM symbols. Here, the sequence is a plurality of modulated complex symbols d(0), ... , d (M _symbol -1). Here, the M _symbol may be M _bit /2. Through this, the terminal can obtain a frequency diversity gain.

Specifically, the M _bit bit UCI (M _bit >2) is bit-level scrambled, QPSK modulated, and mapped to RB(s) of one or two OFDM symbol(s). Here, the number of RBs may be one of 1 to 16.

PUCCH format 3 or PUCCH format 4 can carry UCI in excess of 2 bits. PUCCH format 3 or PUCCH format 4 may be transmitted through consecutive OFDM symbols on the time axis and one PRB on the frequency axis. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 may be one of 4 to 14.

Specifically, the UE may generate _{complex symbols d(0) to d (M symbol} -1) _{by modulating Mbit bit UCI (M bit} >2) with π/2-BPSK (Binary Phase Shift Keying) or QPSK. Here, if π/2-BPSK is used, M _symbol =M _bit , and if QPSK is used, M _symbol =M _bit /2. The UE may not apply block-by-block spreading to PUCCH format 3. However, the UE uses a length-12 PreDFT-OCC so that PUCCH format 4 can have two or four multiplexing capacities, spreading per RB (i.e., 12 subcarriers) on a block-by-block basis. Can be applied. The UE may transmit precoding (or DFT-precoding) the spread signal and map it to each RE, thereby transmitting the spread signal.

In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 may be determined according to the length and maximum code rate of UCI transmitted by the UE. When the UE uses PUCCH format 2, the UE may transmit HARQ-ACK information and CSI information together through PUCCH.

When the number of RBs that the UE can transmit is greater than the maximum number of available RBs in PUCCH format 2, PUCCH format 3, or PUCCH format 4, the UE does not transmit some UCI information according to the priority of UCI information and the remaining UCI information Can only be transmitted.

PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configured through an RRC signal to indicate frequency hopping within a slot. When frequency hopping is configured, the index of the RB to be frequency hopping may be configured as an RRC signal. When PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted over N OFDM symbols on the time axis, the first hop has floor (N/2) OFDM symbols and the second hop is ceil ( It may have N/2) OFDM symbols.

PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configured to be repeatedly transmitted in a plurality of slots. In this case, the number K of slots through which PUCCH is repeatedly transmitted may be configured by an RRC signal.

PUCCHs that are repeatedly transmitted start from OFDM symbols at the same position in each slot and must have the same length. If any one of the OFDM symbols of the slot in which the UE should transmit the PUCCH is indicated as a DL symbol by the RRC signal, the UE can transmit the PUCCH by delaying it to the next slot without transmitting in the corresponding slot.

Meanwhile, in the 3GPP NR system, the UE may perform transmission/reception using a bandwidth less than or equal to the bandwidth of the carrier (or cell). To this end, the terminal may be configured with a bandwidth part (BWP) consisting of a portion of the bandwidth of the carrier.

A terminal operating according to TDD or operating in an unpaired spectrum can receive up to four DL/UL BWP pairs for one carrier (or cell). In addition, the terminal may activate one DL/UL BWP pair. A terminal operating according to FDD or operating in a paired spectrum can receive up to 4 DL BWPs on a downlink carrier (or cell) and up to 4 UL BWPs on an uplink carrier (or cell). Can be configured.

The UE may activate one DL BWP and UL BWP for each carrier (or cell). The terminal may not receive or transmit in time-frequency resources other than the activated BWP. The activated BWP may be referred to as an active BWP.

The base station may indicate an activated BWP among the BWPs configured by the terminal through downlink control information (DCI). The BWP indicated through DCI is activated, and other configured BWP(s) are deactivated.

In a carrier (or cell) operating in TDD, the base station may include a bandwidth part indicator (BPI) indicating the BWP activated in the DCI scheduling the PDSCH or PUSCH to change the DL/UL BWP pair of the terminal.

The UE may receive a DCI scheduling a PDSCH or a PUSCH and may identify a DL/UL BWP pair activated based on the BPI. In the case of a downlink carrier (or cell) operating in FDD, the base station may include a BPI indicating the activated BWP to the DCI scheduling the PDSCH to change the DL BWP of the terminal.

In the case of an uplink carrier (or cell) operating in FDD, the base station may include a BPI indicating a BWP activated in DCI scheduling a PUSCH in order to change the UL BWP of the terminal.

8 is a diagram for explaining carrier aggregation.

Carrier aggregation is a frequency block or (logical meaning) in which the UE is configured with uplink resources (or component carriers) and/or downlink resources (or component carriers) in order for the wireless communication system to use a wider frequency band. ) It refers to a method of using multiple cells as one large logical frequency band.

One component carrier (CC) may also be referred to as a primary cell (PCell), a secondary cell (SCell), or a primary SCell (PScell). However, hereinafter, for convenience of description, the term “component carrier” will be used.

FIG. 8 shows an example of a 3GPP NR system in which the entire system band includes a maximum of 16 component carriers, and each component carrier has a bandwidth of a maximum of 400 MHz. A component carrier may include one or more physically contiguous subcarriers.

In FIG. 8, it is shown that each component carrier has the same bandwidth, but each component carrier may have a different bandwidth. In addition, although FIG. 8 shows that each component carrier is adjacent to each other on the frequency axis as a logical concept, each component carrier may be physically adjacent to each other or may be separated from each other.

Different center frequencies may be used in each component carrier. In addition, one center frequency common to component carriers that are physically adjacent may be used.

Assuming that all component carriers are physically adjacent, the center frequency A can be used in all component carriers. In addition, assuming that the respective component carriers are not physically adjacent, the center frequency A and the center frequency B may be used in each of the component carriers.

When the entire system band is extended by carrier aggregation, a frequency band used for communication with each terminal may be defined in a component carrier unit.

Terminal A can use the entire system band of 100 MHz and can perform communication using all five component carriers. Terminals B1 to B5 can use only 20 MHz bandwidth and can perform communication using one component carrier. Terminals C1 and C2 may use a 40 MHz bandwidth and may perform communication using two component carriers, respectively.

The two component carriers may or may not be logically/physically contiguous. In FIG. 8, a case in which terminal C1 uses two non-adjacent component carriers and terminal C2 uses two adjacent component carriers is illustrated.

9A is a diagram illustrating an example of a subframe structure of a single carrier, and FIG. 9B is a diagram illustrating an example of a subframe structure of a multicarrier.

A typical wireless communication system (eg, FDD mode) may perform data transmission or reception through one DL band and one UL band corresponding thereto. As another example, a wireless communication system (e.g., TDD mode) divides a radio frame into an uplink time unit and a downlink time unit in a time domain, and data transmission or reception can be performed through an uplink/downlink time unit. have.

Referring to FIG. 9B, three 20MHz component carriers (CC) are gathered in each of the UL and the DL, so that a bandwidth of 60MHz may be supported. Each of the CCs may or may not be adjacent to each other in the frequency domain.

In FIG. 9B, a case in which both the bandwidth of the UL CC and the bandwidth of the DL CC are the same and is symmetric is illustrated, but the bandwidth of each CC may be independently determined. In addition, asymmetric carriers having different numbers of UL CCs and DL CCs may be aggregated. A DL/UL CC allocated/configured to a specific terminal through RRC may be referred to as a serving DL/UL CC of a specific terminal.

The base station may perform communication with the terminal by activating some or all of the serving CCs of the terminal or deactivating some of the CCs. The base station may change the activated/deactivated CC, and may change the number of activated/deactivated CCs.

When the base station allocates a cell-specific or terminal-specific CC available to the terminal, at least one of the allocated CCs is not deactivated once the CC allocation for the terminal is completely reconfigured or the terminal does not handover. May not.

One CC that is not deactivated to the terminal is called a primary CC (PCC) or a PCell (primary cell), and a CC that the base station can freely activate/deactivate is a secondary CC (SCC)) or SCell ( secondary cell).

Meanwhile, 3GPP NR uses the concept of a cell to manage radio resources. A cell is defined as a combination of a downlink resource and an uplink resource, that is, a combination of a DL CC and a UL CC.

A cell may be configured with a DL resource alone or a combination of a DL resource and a UL resource. When carrier aggregation is supported, a linkage between a carrier frequency of a DL resource (or DL CC) and a carrier frequency of a UL resource (or UL CC) may be indicated by system information.

The carrier frequency may mean the center frequency of each cell or CC. A cell corresponding to the PCC may be referred to as a PCell, and a cell corresponding to the SCC may be referred to as an SCell. The carrier corresponding to the PCell in the downlink is DL PCC, and the carrier corresponding to the PCell in the uplink is UL PCC.

Similarly, a carrier corresponding to an SCell in downlink is a DL SCC, and a carrier corresponding to an SCell in uplink is a UL SCC. Depending on the terminal capability, the serving cell(s) may consist of one PCell and zero or more SCells.

In the case of a UE that is in the RRC_CONNECTED state but does not support carrier aggregation or does not support carrier aggregation, only one serving cell composed of PCells may exist.

As mentioned above, the term cell used in carrier aggregation may be distinguished from the term cell indicating a certain geographic area in which communication service is provided by one base station or one antenna group. That is, one component carrier may also be referred to as a scheduling cell, a scheduled cell, a primary cell (PCell), a secondary cell (SCell), or a primary SCell (PScell).

However, in order to distinguish between a cell indicating a certain geographic area and a cell of carrier aggregation, in the present invention, the cell of the carrier aggregation may be referred to as a CC, and the cell of the geographic area may be referred to as a cell.

10 is a diagram illustrating an example of a method to which a cross-carrier scheduling technique is applied.

When cross-carrier scheduling is configured, the control channel transmitted through the first CC may schedule a data channel transmitted through the first CC or the second CC using a carrier indicator field (CIF).

CIF can be included in DCI. For example, a scheduling cell is configured, and a DL grant/UL grant transmitted in a PDCCH region of a scheduling cell may schedule a PDSCH/PUSCH of a scheduled cell. That is, a search region for a plurality of component carriers may exist in the PDCCH region of the scheduling cell. The PCell is basically a scheduling cell, and a specific SCell may be designated as a scheduling cell by an upper layer.

In FIG. 10, it is assumed that three DL CCs are merged. Here, DL component carrier #0 is assumed to be a DL PCC (or PCell), and DL component carrier #1 and DL component carrier #2 are assumed to be DL SCC (or SCell). In addition, it is assumed that the DL PCC is set as the PDCCH monitoring CC.

If crosscarrier scheduling is not configured by UE-specific (or UE-group-specific or cell-specific) higher layer signaling, CIF is disabled, and each DL CC has its own without CIF according to the NR PDCCH rule. Only the PDCCH scheduling the PDSCH can be transmitted (non-cross-carrier scheduling, self-carrier scheduling).

On the other hand, when cross-carrier scheduling is configured by terminal-specific (or terminal-group-specific or cell-specific) higher layer signaling, CIF is enabled, and a specific CC (e.g., DL PCC) uses CIF. By using the PDCCH for scheduling the PDSCH of DL CC A, as well as the PDCCH for scheduling the PDSCH of another CC can be transmitted (cross-carrier scheduling).

On the other hand, PDCCH may not be transmitted in other DL CCs. Therefore, the UE monitors the PDCCH that does not include CIF and receives the self-carrier-scheduled PDSCH according to whether the UE is configured with cross-carrier scheduling, or monitors the PDCCH including the CIF to receive the cross-carrier-scheduled PDSCH. I can.

Meanwhile, FIGS. 9A to 10 illustrate a subframe structure of a 3GPP LTE-A system, but the same or similar configuration may be applied to a 3GPP NR system. However, in the 3GPP NR system, the subframes of FIGS. 9A to 10 may be replaced with slots.

FIG. 11 is a schematic block diagram of a wireless communication system in which an apparatus for measuring resource usage according to an embodiment is implemented, and FIG. 12 is a schematic block diagram of the apparatus for measuring resource usage shown in FIG. 11.

The wireless communication system 10 may be a 3GPP NR system, but is not limited thereto.

The wireless communication system 10 may include a terminal 100 and a base station 200.

The terminal 100 may be implemented as various types of wireless communication devices or computing devices that guarantee portability and mobility. The terminal may be referred to as a user equipment (UE), a station (STA), a mobile subscriber (MS), or the like.

The base station 200 controls and manages a cell (eg, a macro cell, a femto cell and/or a pico cell, etc.) corresponding to a service area, and transmits a signal, assigns a channel, monitors a channel, self-diagnosis, and/or relays. It can perform functions such as. The base station may be referred to as a Next Generation NodeB (gNB) or an Access Point (AP).

In addition, although FIG. 11 shows that the resource usage measurement device 300 is implemented in the base station 200, the resource usage measurement device 300 may be separately implemented outside the base station 200. Furthermore, the resource usage measurement device 300 may be implemented in the terminal 100.

The base station 200 may include a resource usage measurement device 300.

The resource usage measurement device 300 may measure the frequency resource usage (or usage rate) of the base station 200 in the wireless communication system 10.

The resource usage measurement apparatus 300 may provide frequency resource distribution and flexible resource policy establishment of the wireless communication system 100 by measuring the usage of radio frequency resources used by the wireless communication system 100.

The resource usage measurement device 300 may include a memory 400 and a processor 500.

The memory 400 may store instructions (or programs) executable by the processor 500. For example, the instructions may include instructions for executing an operation of the processor 500 and/or an operation of each component of the processor 500.

The processor 500 may process data stored in the memory 400. The processor 500 may execute computer-readable code (eg, software) stored in the memory 400 and instructions induced by the processor 500.

The processor 500 may be a data processing device implemented in hardware having a circuit having a physical structure for executing desired operations. For example, desired operations may include code or instructions included in a program.

For example, a data processing device implemented in hardware is a microprocessor, a central processing unit, a processor core, a multi-core processor, and a multiprocessor. , Application-Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA).

When the resource usage measurement device 300 is implemented in the base station 200, the memory 400 and the processor 500 may be implemented separately from the configurations of the base station 200, but existing included in the base station 200 It may be implemented with the memory 230 and the processor 210.

Further, when the resource usage measurement device 300 is implemented in the terminal 100, the memory 400 and the processor 500 may be implemented separately from the configurations of the terminal 100, but included in the terminal 100 The existing memory 130 and the processor 110 may be implemented.

FIG. 13 is a diagram for describing a method of measuring resource usage by the device for measuring resource usage according to FIG. 11.

Specifically, FIG. 13 shows an example of a Demodulation Reference Signal (DM-RS) of a PDSCH used in the wireless communication system 10.

The sequence used for the DM-RS of the PDSCH may be generated based on a scrambling ID. For example, the terminal 100 may be configured _{with two scrambling IDs N ID} ⁰ and N _ID ^{1 from an upper layer.} For example, two scrambling IDs N _ID ⁰ and N _ID ¹ can be set to one of 0, 1, ..., 65535.

If the above two scrambling IDs are not configured from the upper layer, the terminal 100 may determine that N _ID ⁰ and N _ID ¹ are the cell IDs N _ID ^cells .

The terminal 100 may generate a sequence used for the DM-RS of the PDSCH as shown in Equation 3 based on the two scrambling IDs.

로 초기화될 수 있다.

는 슬롯당 심볼의 수이고,

은 프레임 내 슬롯의 인덱스이고, l은 슬롯 내 DM-RS가 전송되는 OFDM 심볼의 인덱스일 수 있다.

는 0 또는 1의 값으로 하향링크 제어 정보(DCI)에서 지시될 수 있다. 만약 지시되지 않으면 단말(100)은 0으로 가정할 수 있다.Here, c(i) is a pseudo-random sequence, and the pseudo-random sequence is

Can be initialized to

Is the number of symbols per slot,

Is an index of a slot in a frame, and l may be an index of an OFDM symbol through which a DM-RS is transmitted in the slot.

Is a value of 0 or 1 and may be indicated in downlink control information (DCI). If not indicated, the terminal 100 may assume 0.

The sequence r(n) of the DM-RS of the PDSCH may be mapped to a resource element (RE). Assuming that the index of the RE through which the DM-RS is transmitted is (k,l), RE (k,l) The DM-RS transmitted in may be expressed as Equation 4.

는 전송 파워를 나타내고,

과

은 각각 주파수 영역의 OCC(Orthogonal cover code)와 시간 영역의 OCC를 나타낼 수 있다.

,

, 및 Δ는 configuration type에 따라 표 4 및 표 5에 주어진 값을 가질 수 있다.Here, configuration type 1 and configuration type 2 indicate the arrangement of the DM-RS, and may be indicated by an upper layer.

Represents the transmission power,

and

May represent an orthogonal cover code (OCC) in a frequency domain and an OCC in a time domain, respectively.

,

, And Δ may have values given in Tables 4 and 5 depending on the configuration type.

The index (k,l) of the RE through which the DM-RS is transmitted may be determined as follows. k is the index of the RE in the frequency domain, and l may be the index of the OFDM symbol in the time domain in which the RE is included.

The frequency domain index k of the RE through which the DM-RS is transmitted may be charged from 0 of the subcarrier of the common resource block 0. The common resource block may be a resource block indicating a reference of a frequency domain commonly used by all terminals in a cell.

In the case of downlink, the common resource block 0 may be indicated by using a difference from CORESET0 in SIB1 during cell access. In the case of uplink, the common resource block 0 may be indicated by using an Absolute Radio Frequency Channel Number (ARFCN) in SIB1 during cell access.

When the terminal 100 does not know the location of the common resource block 0 (eg, in case of initial cell access), the PDSCH may be charged from subcarrier 0 of the lowest resource block of the CORESET of the PDCCH scheduling the PDSCH.

The time domain index l of the RE through which the DM-RS is transmitted may be determined according to the mapping type of the PDSCH. In the case of PDSCH mapping type A, l may be assigned from the first symbol of the slot (eg, l=0 may be the first symbol of the slot). l ₀ may have a value of 2 or 3 depending on the upper layer.

In the case of PDSCH mapping type B, l may be assigned based on the first symbol among resources for which the PDSCH is scheduled (eg, l=0 may be the first symbol scheduled for PDSCH). Also, l ₀ may be 0.

과

의 합으로 결정될 수 있다. 여기서

는 DM-RS가 전송되는 심볼의 수를 나타낼 수 있다.The time domain index l of the RE through which the DM-RS is transmitted is

and

It can be determined by the sum of. here

May represent the number of symbols through which the DM-RS is transmitted.

는 0이고, 이중 심볼(double symbol) DM-RS를 설정받으면

는 0과 1일 수 있다.When the terminal 100 receives a single symbol DM-RS

Is 0, and if double symbol DM-RS is set,

Can be 0 and 1.

에 따른

는 표 6을 통하여 결정될 수 있다.Number of symbols for which PDSCH is scheduled

In accordance

Can be determined through Table 6.

The wireless communication system may measure a utilization rate of a radio frequency resource based on the signal strength of the frequency resource. In the method of measuring each frequency resource, since the measurement result of each frequency resource is different according to the channel specification, reliability is low, and there may be a problem that the frequency usage rate is measured high due to an interference signal from a base station or terminal other than the base station to be specified. have.

As another example, the wireless communication system may measure the amount of resources used by the base station by extracting information related to resource use by receiving the PDCCH transmitted by the base station. Since the wireless communication system must receive all PDCCHs transmitted by the base station, the complexity for decoding may be very high. In addition, due to different PDCCH configurations (e.g., control resource set and search space configuration) for each terminal, the combination of time-frequency resources to monitor the PDDCH is various, and the field of the DCI transmitted by the PDCCH (bandwidth part) It may be difficult to receive PDCCHs of all UEs due to various configurations of a field according to configuration, a field related to scheduling, a field related to MIMO, a field related to power control, etc.).

The wireless communication system 10 may measure the frequency resource utilization rate of the base station by receiving the DM-RS of the downlink data channel transmitted by the base station 200.

The LTE system uses a downlink data transmission method using a common reference signal (CRS). Therefore, since the LTE system transmits CRS in all bands regardless of the allocation of PDSCH transmitted by the base station, the amount of time-frequency resource usage of the PDSCH allocated by the base station cannot be measured by receiving the CRS.

In addition, the LTE system also uses a downlink data transmission method using a DM-RS. Since the DM-RS of the LTE system is transmitted only in some of the frequency resources, it may be insufficient to measure the PDSCH resource allocation information of the REs of all frequency resources.

The wireless communication system 10 (for example, an NR system) may not support a downlink data transmission method using a CRS, but may support only a downlink data transmission method using a DM-RS. Further, in the wireless communication system 10, the DM-RS may be transmitted in one or a plurality of symbols, and may be transmitted in REs arranged at equal intervals in the frequency domain.

Accordingly, since the wireless communication system 10 can accurately know the frequency resource used by the base station 200 by receiving the DM-RS, it can be easy to measure the frequency resource utilization rate of the base station.

Hereinafter, a method of measuring a frequency resource utilization rate by using the resource usage measurement apparatus 300 implemented in the wireless communication system 10 using DM-RS reception will be described.

The wireless communication system 10 can use two types of PDSCH resource allocation schemes.

In the first method, the wireless communication system 10 configures a resource block group (RBG) by bundling resource blocks (RBs), and indicates whether the RBGs have been used for scheduling in the DCI scheduling PDSCH with a bitmap. I can. The first scheme may be a bitmap-based scheduling scheme.

As a second method, the wireless communication system 10 may indicate in the DCI the index of the start resource block in which the PDSCH is scheduled and the number of consecutive resource blocks in units of one resource block. The index of the starting resource block and the number of consecutive resource blocks may be jointly encoded using a resource indication value (RIV) and indicated in DCI. The second scheme may be an RIV-based scheduling scheme.

The resource usage measurement apparatus 300 may determine a configuration of a bandwidth part (BWP) suitable for a frequency band used by the base station 200.

The base station 200 may support the terminal 100 by using a wide band of available BWP. A narrow band BWP may be configured in some terminals 100. In this case, the terminal 100 configured with the narrow-band BWP may be for reducing power consumption, not data transmission. That is, when the terminal 100 receives data transmission, a wide band BWP supported by the base station 200 may be used instead of a narrow band BWP.

It is preferable that the resource usage measurement apparatus 300 uses a wide band BWP configuration that can be used by the base station 200 to measure downlink resources.

The resource usage measurement apparatus 300 may use a BWP including all resource blocks in a frequency band used by the base station 200. In this case, it is assumed that the base station 200 uses all possible resource blocks as much as possible.

The resource usage measurement apparatus 300 may receive a physical broadcast channel (PBCH) transmitted from the base station 200 and infer the BWP configuration from the configuration of CORESET0. The resource usage measurement apparatus 300 may regard the band of CORESET0 as a downlink BWP when the terminal 100 initially accesses the cell. In this case, it is assumed that the base station 200 does not change the downlink BWP determined as the band of CORESET0 unless there is a specific reason.

The resource usage measurement apparatus 300 may receive the SIB1 transmitted from the base station 200 and infer the BWP configuration from the initial DL BWP configuration. The terminal 100 may receive a PDCCH for transmitting SIB1 at CORESET0 indicated by the PBCH. In SIB1, the initial DL BWP configuration can be indicated in units of one resource block. All terminals accessing the base station 200 may determine the BWP according to the initial DL BWP configuration indicated by SIB1.

The resource usage measurement apparatus 300 may infer a BWP configuration from a DL BWP configuration indicated by a UE-specific RRC signal transmitted from the base station 200. The terminal 100 may receive a terminal-specific RRC signal from the base station in the random access process, and information on the DL BWP may be included among the information. The resource usage measurement device 300 may infer information on the BWP configuration used by the base station by using the information on the DL BWP.

The configuration of the BWP used by the base station 200 may determine a frequency band that the device 300 for measuring resource usage should receive for resource measurement. For example, when the resource usage measurement device 300 measures a frequency usage rate of a wider frequency band than the BWP used by the base station 200, the frequency resource not used by the base station is included, so that the frequency usage rate is measured less. Can occur.

The resource usage measurement device 300 may determine whether the DM-RS is transmitted in a symbol in which the DM-RS may be transmitted in units of one resource block. The resource usage measurement device 300 may determine whether a DM-RS is transmitted in all symbols.

The resource usage measurement apparatus 300 may use a correlation in one resource block unit to determine whether a DM-RS is transmitted in a symbol in which the DM-RS is likely to be transmitted in one resource block unit.

Since the resource usage measurement apparatus 300 detects the DM-RS sequence of one resource block, it may not be able to detect the DM-RS sequence in a specific situation (eg, a situation in which the channel situation is poor). The resource usage measurement device 300 may detect the DN-RS sequence of one resource block by using the characteristics of the PDSCH scheduling method.

The resource usage measurement apparatus 300 may find out the number of resource blocks RBs grouped into a resource block group RBG in a bitmap-based scheduling method.

The resource usage measurement apparatus 300 may determine the number of resource blocks included in the resource block group based on the BWP used by the base station 200. The terminal 200 may be set to one of two values as the number of resource blocks grouped into a resource block group. The resource usage measurement device 300 may use the smaller of the two values.

The resource usage measurement apparatus 300 may determine the maximum number of resource blocks grouped into a resource block group even though a plurality of resource blocks are grouped into one resource block group. For example, the resource usage measurement device 300 may assume that up to 4 resource blocks may be grouped into one RBG.

When a plurality of resource blocks are grouped into one resource block group, and the frequency usage rate is determined in units of resource blocks, the frequency domain corresponding to one resource block group is widened and fluctuations due to fading in the frequency domain. It can increase the likelihood of false results.

The resource usage measurement apparatus 300 may detect the index of a start resource block allocated to PDSCH scheduling and the number of consecutive resource blocks in the RIV-based scheduling scheme. That is, the resource usage measurement apparatus 300 may increase the reliability of DM-RS sequence detection by utilizing information that it can be scheduled in consecutive resource blocks.

For example, when the resource usage measurement device 300 detects the DM-RS sequence in RB#0, RB#1, and RB#3, and does not detect the DM-RS sequence in RB#2, the RIV-based scheduling method In RB#2, only contiguous resource blocks can be scheduled, so even if the detection of the DM-RS sequence fails in RB#2, the resource usage measurement device 300 performs a DM-RS sequence in RB#0, RB#1, RB#2, and RB#3. It can be determined that the detection was successful.

That is, the resource usage measurement device 300 transmits the DM-RS sequence to the resource block that has failed to detect if the DM-RS sequence is successfully detected in both contiguous resource blocks of the resource block in which the detection of the DM-RS sequence has failed. It can be judged by RB.

The device 300 for measuring resource usage may perform scheduling in units of one resource block in the RIV-based scheduling scheme, and thus may detect a DM-RS sequence in units of one resource block.

When the resource usage measurement device 300 detects the DM-RS sequence in units of one resource block, it may occur that the detection of the DM-RS sequence fails in a specific situation. To reduce this, in the bitmap-based scheduling method, the resource The DM-RS sequence can be detected in units of block groups.

The resource usage measurement apparatus 300 may use K consecutive resource blocks in the RIV-based scheduling scheme to detect a DM-RS sequence. For example, if the BWP is composed of 20 RBs (RB#0 to RB#19) and K is 4, the resource usage measurement device 300 detects the DM-RS sequence of K consecutive resource blocks. Can be used for

That is, the resource usage measurement apparatus 300 may detect the DM-RS sequence using {RB#0, RB#1, RB#2, RB#3} as the first resource blocks. In addition, the resource usage measurement device 300 may detect the DM-RS sequence using {RB#1, RB#2, RB#3, RB#4} as the second RBs, and continue to {RB# 16, RB#17, RB#18, RB#19} can be used to detect the DM-RS sequence.

The resource usage measurement apparatus 300 may increase a DM-RS sequence detection probability by detecting a DM-RS sequence using a plurality of consecutive resource blocks.

From the viewpoint of measuring the frequency resource utilization rate, even if the resource allocation information is added even if the resource allocation is smaller than K RBs, the result value of the resource consumption measuring apparatus 300 is not significantly affected. An important thing in measuring the frequency resource usage rate of the resource usage measurement apparatus 300 may be detecting a PDSCH scheduled for a number of resources that may have a great influence on a result value.

The resource usage measurement device 300 may determine the detection of the DM-RS using the correlation. The resource usage measurement apparatus 300 includes a signal x(i) received from resource elements (REs) of a symbol in which the DM-RS of the PDSCH may be transmitted and a DM-RS sequence c(i) that is expected to be transmitted by the base station. ) Can be measured.

After estimating the channel h(i) of the RE using x(i), the resource usage measurement device 300 may use a maximum likelihood detector, assuming that h(i) is an actual channel. .

의 합을 상관도로 사용할 수 있다. 자원 사용량 측정 장치(300)는

의 합이 작을수록 DM-RS 시퀀스가 전송되었다고 판단할 수 있다. 자원 사용량 측정 장치(300)는 매 심볼마다 채널 추정을 수행하여야 하므로 높은 복잡도가 발생할 수 있다.For example, the resource usage measurement device 300

The sum of can be used as a correlation. The resource usage measurement device 300

It can be determined that the DM-RS sequence is transmitted as the sum of the is smaller. Since the resource usage measurement apparatus 300 must perform channel estimation for each symbol, high complexity may occur.

The resource usage measurement apparatus 300 may use a difference in phase information to measure a correlation with low complexity.

The DM-RS sequence c(i) may be modulated and transmitted with QPSK (eg, one of 1+j, 1-j, -1+j, and -1-j). Therefore, c(i) and c(i+1) may have a phase difference of 0, pi/2, pi, and 3pi/2. If c(i) is transmitted and the received signal is x(i), then x(i) also has a phase difference of 0, pi/2, pi, 3pi/2 (ignoring the noise effect). I can.

The resource usage measurement device 300 may detect the DM-RS using the phase difference. For example, if the length of c(i) is M, M is the number of REs that are grouped together to detect DM-RSs and may vary according to the number of resource blocks included in the resource block group.

의 합으로 결정할 수 있다. 즉, 자원 사용량 측정 장치(300)는 두 위상차의 거리차이를 상관도로 정의할 수 있다. 자원 사용량 측정 장치(300)는

의 합이 작을수록 DM-RS 시퀀스가 전송되었다고 판단할 수 있다.The phase difference between c(i) and c(i+1) can be expressed as d(i), and the phase difference between x(i) and x(i+1) can be expressed as y(i). The resource usage measurement device 300 calculates a correlation

It can be determined by the sum of. That is, the resource usage measurement apparatus 300 may define a distance difference between two phase differences as a correlation diagram. The resource usage measurement device 300

It can be determined that the DM-RS sequence is transmitted as the sum of the is smaller.

When the resource usage measurement apparatus 300 detects a DM-RS sequence, the resource usage measurement apparatus 300 may at least know information on resource blocks used by the base station for scheduling.

In the case of the LTE system, all symbols of one subframe (1ms) may always be identically scheduled. In the case of the wireless communication system 10 (for example, an NR system), a mini-slot concept may be introduced so that symbols may be differently scheduled within one slot. Therefore, even if a DM-RS sequence is detected in one slot of the wireless communication system 10, it is not possible to know which symbols of the slot are allocated. In order to solve this problem, the resource usage measurement device 300 may measure the amount of resource usage in the time domain resource.

Table 7 shows combinations in which a base station can schedule a PDSCH and a PUSCH to a terminal in an NR system. Hereinafter, PDSCH scheduling will be described, but the same can be applied to PUSCH scheduling.

Referring to Table 7, possible allocation combinations may be 31 types for PDSCH mapping type A and 33 types for PDSCH mapping type B. There are 62 possible allocation combinations. At this time, there may be two cases in which mapping types A and B allocate the same scheduling.

According to Table 7, the combinations that the base station 200 can schedule to the terminal 100 may be limited. For example, when the resource usage measurement apparatus 300 detects a DM-RS in the first symbol, a possible PDSCH allocation may be a PDSCH mapping type B and a length of 2, 4, or 7 may be used. That is, the resource usage measuring device 300 is {symbol #0, symbol #1}, {symbol #0, symbol #1, symbol #2, symbol #3}, or {symbol #0, symbol #1) in the time domain. , Symbol #2, symbol #3, symbol #4, symbol #5, symbol #6}, it may be determined that the PDSCH is allocated.

The base station 200 may not use all combinations of Table 7 for scheduling. For example, the terminal 100 may receive up to 16 different PDSCH scheduling combinations through a 4-bit time domain resource assignment (TDRA) field of DCI scheduling PDSCH. In addition, when the base station 200 does not set up to 16 PDSCH scheduling combinations to the terminal 100 through separate signaling, the terminal 100 may use the default PDSCH TDRA table. Table 8 shows the default PDSCH TDRA table.

In Table 8, the allocable PDSCH scheduling can be summarized as shown in Table 9. In this case, dmrs-TypeA-Position may be assumed to be 2.

There may be a symbol in which the DM-RS of the PDSCH is not located. That is, the DM-RS symbol in which the DM-RS of the PDSCH can be located may be determined. For example, referring to Tables 9 and 12, symbol #0, symbol #1, symbol #3, symbol #6, symbol #7, symbol #10, symbol #11, and symbol #13 are DM-RS of PDSCH. May not be located, and the DM-RS may be located in symbol #2, symbol #4, symbol #5, symbol #8, symbol #9, and symbol #12.

When detecting the DM-RS of the PDSCH, the resource usage measurement device 300 may monitor only symbols in which the DM-RS can be located. In addition, when the resource usage measurement device 300 receives the DM-RS of the PDSCH in one symbol, it can obtain a PDSCH scheduling combination that can be allocated from the DM-RS, and the DM-RS of the PDSCH is located by using the combination. It is possible to determine the possible symbols.

For example, when the resource usage measuring device 300 detects the DM-RS of the PDSCH in symbol #2, the resource usage measuring device 300 is at least {symbol #2, symbol #3, symbol #4, symbol # 5} may be determined to be used for PDSCH allocation unconditionally. Accordingly, the resource usage measurement apparatus 300 may not need to detect whether or not DM-RS is transmitted in symbol #4 and symbol #5.

The combinations of symbols that can be transmitted to the DM-RS of the PDSCH are {symbol #2}, {symbol #4}, {symbol #5}, {symbol #8}, {symbol #9}, {symbol #12}, {symbol #2, symbol #8}, {symbol #2, symbol #9}, {symbol #2, symbol #12}, {symbol #2, symbol #8, symbol #12}, {symbol #2, symbol #9 , Symbol #12}, {symbol #4, symbol #8}, {symbol #4, symbol #9}, {symbol #4, symbol #12}, {symbol #4, symbol #8, symbol #12}, {Symbol #5, Symbol #8}, {Symbol #5, Symbol #9}, {Symbol #5, Symbol #12}, {Symbol #5, Symbol #8, Symbol #12}, {Symbol #8, Symbol There can be a total of 21 combinations of #12} and {symbol #9, symbol #12}.

When the DM-RS of the PDSCH is received in one symbol, the device 300 for measuring resource usage may be easy to infer one scheduling information. For example, when the resource usage measurement device 300 detects the DM-RS of the PDSCH in symbol #8, possible PDSCH scheduling may be {symbol #8, symbol #9, symbol #10, symbol #11}.

Even if the resource usage measurement device 300 detects the DM-RS symbol of the PDSCH, a plurality of PDSCH combinations may exist in the time domain. The resource usage measurement device 300 may determine one of these combinations.

The resource usage measurement apparatus 300 may compare the reception power of each symbol to determine the last symbol of the PDSCH. For example, when the resource usage measurement device 300 has a reception power of P in symbol #4, but the reception power falls below or increases to a certain level than P in symbol #5, the resource usage measurement device 300 is a symbol #4 may be determined as the last symbol of the PDSCH.

This takes advantage of the fact that symbols allocated to the PDSCH must use the same power. However, when PDSCHs using the same power are continuously scheduled, the last symbol of the PDSCH may not be accurately determined using the received power.

The resource usage measurement apparatus 300 may determine the last symbol using a constellation of a signal transmitted in each symbol. When transmitting the PDSCH to the terminal 100, the base station 200 may use one modulation. For example, it may be QPSK, 16QAM, 64QAM, and the like.

The resource usage measurement apparatus 300 may monitor the constellation of each symbol to determine the last symbols of the PDSCH. When transmitting the PDSCH to the terminal 100, the base station 200 may use the same beamforming and/or a precoder. Accordingly, almost the same constellation can be shown in one PDSCH. Different PDSCHs may use different modulation orders or may use different beamforming to show different constellations.

14 is a detailed block diagram of the wireless communication system shown in FIG. 11.

The terminal 100 may include a processor 110, a communication module 120, a memory 130, a user interface 140, and a display 150.

The processor 110 and the memory 130 may be the processor 500 and the memory 400 shown in FIG. 12, respectively. For example, the device 300 for measuring resource usage may be implemented with the processor 110 and the memory 130.

The processor 110 may execute various commands or programs and process data inside the terminal 100. In addition, the processor 110 may control the entire operation including each unit of the terminal 100 and control data transmission/reception between the units. Here, the processor 110 may be configured to perform all functions of the terminal 100. For example, the processor 110 may receive slot configuration information, determine a slot configuration based on this, and perform communication according to the determined slot configuration.

The communication module 120 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. The communication module 120 may include a first communication module 121, a second communication module 122, and a third communication module 123.

For example, the first communication module 121 and the second communication module may be a cellular communication interface card, and the third communication module 123 may be an unlicensed band communication interface card. That is, the communication module 120 may include a plurality of network interface cards (NICs) including the cellular communication interface cards 121 and 122 and the unlicensed band communication interface card 123 in an internal or external form. have.

In FIG. 14, the communication module 120 is shown as an integrated integrated module, but the first communication module to the third communication module 121 to 123 (for example, each network interface card) may be independently arranged according to the circuit configuration or use. I can.

The cellular communication interface card 121 transmits and receives a radio signal with at least one of the base station 200, an external device, and a server using a mobile communication network, and provides a cellular communication service according to a first frequency band based on a command of the processor 110. Can provide.

The cellular communication interface card 121 may include at least one NIC module using a frequency band of less than 6 GHz. At least one NIC module of the cellular communication interface card 121 independently communicates with at least one of the base station 200, an external device, and a server according to a cellular communication standard or protocol of a frequency band of less than 6 GHz supported by the corresponding NIC module. You can do it.

The cellular communication interface card 122 transmits and receives a radio signal with at least one of the base station 200, an external device (not shown), and a server (not shown) using a mobile communication network, and based on a command of the processor 110 It is possible to provide a cellular communication service based on the second frequency band.

The cellular communication interface card 122 may include at least one NIC module using a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 122 independently performs cellular communication with at least one of the base station 200, an external device, and a server according to a cellular communication standard or protocol of a frequency band of 6 GHz or higher supported by the corresponding NIC module. You can do it.

The unlicensed band communication interface card 123 transmits and receives a radio signal with at least one of the base station 200, an external device, and a server using a third frequency band that is an unlicensed band, Can provide communication service.

The unlicensed band communication interface card 123 may include at least one NIC module using the unlicensed band. For example, the unlicensed band may be a 2.4 GHz or 5 GHz band.

At least one NIC module of the unlicensed band communication interface card 123 is independently or dependently connected to at least one of the base station 200, an external device, and a server according to the unlicensed band communication standard or protocol of the frequency band supported by the corresponding NIC module. Wireless communication can be performed.

The memory 130 may store a control program used in the terminal 100 and various data corresponding thereto. Such a control program may include a predetermined program necessary for the terminal 100 to perform wireless communication with at least one of the base station 200, an external device, and a server.

The user interface 140 may include various types of input/output means provided in the terminal 100. For example, the user interface 140 may receive a user's input using various input means, and the processor 110 may control the terminal 100 based on the received user input. In addition, the user interface 140 may perform output based on a command of the processor 110 using various output means.

The display 150 may output various images on the display screen. The display 150 may output various display objects such as content executed by the processor 110 or a user interface based on a control command of the processor 110.

The base station 200 may include a processor 210, a communication module 220, and a memory 230.

The processor 210 and the memory 230 may be the processor 500 and the memory 400 shown in FIG. 12, respectively. For example, the device 300 for measuring resource usage may be implemented with a processor 210 and a memory 230.

The processor 210 may execute various commands or programs and process data inside the base station 200. In addition, the processor 210 may control the entire operation including each unit of the base station 200 and control data transmission/reception between the units.

The processor 210 may be configured to perform a function of the base station 200. For example, the processor 210 may signal slot configuration information and perform communication according to the signaled slot configuration.

The communication module 220 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. The communication module 220 may include a first communication module 221, a second communication module 222, and a third communication module 223.

For example, the first communication module 221 and the second communication module may be a cellular communication interface card, and the third communication module 223 may be an unlicensed band communication interface card. That is, the communication module 220 may include a plurality of network interface cards including the cellular communication interface cards 221 and 222 and the unlicensed band communication interface card 223 in an internal or external form.

In FIG. 14, the communication module 220 is shown as an integrated integrated module, but the first to third communication modules 221 to 223 (for example, each network interface card) may be independently arranged according to the circuit configuration or use. I can.

The cellular communication interface card 221 transmits and receives a wireless signal with at least one of the terminal 100, an external device (not shown), and a server (not shown) using a mobile communication network, and based on a command of the processor 210 It is possible to provide a cellular communication service based on the first frequency band.

The cellular communication interface card 221 may include at least one NIC module using a frequency band of less than 6 GHz. At least one NIC module of the cellular communication interface card 221 independently includes a terminal 100, an external device (not shown), and a server ( Cellular communication may be performed with at least one of (not shown).

The cellular communication interface card 222 transmits and receives a wireless signal with at least one of the terminal 100, an external device (not shown), and a server (not shown) using a mobile communication network, and based on a command of the processor 210 It is possible to provide a cellular communication service based on the second frequency band.

The cellular communication interface card 222 may include at least one NIC module using a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 222 is independently a terminal 100, an external device (not shown), and a server (not shown) according to a cellular communication standard or protocol of a frequency band of 6 GHz or higher supported by the corresponding NIC module. City) can perform cellular communication with at least one of.

The unlicensed band communication interface card 223 transmits and receives a wireless signal with at least one of the terminal 100, an external device (not shown), and a server (not shown) using a third frequency band that is an unlicensed band, and the processor 210 ) On the basis of the command, it is possible to provide a communication service of the unlicensed band.

The unlicensed band communication interface card 223 may include at least one NIC module using the unlicensed band. For example, the unlicensed band may be a 2.4 GHz or 5 GHz band.

At least one NIC module of the unlicensed band communication interface card 223 is independently or dependent on the unlicensed band communication standard or protocol of the frequency band supported by the corresponding NIC module, the terminal 100, an external device (not shown), and It is possible to perform wireless communication with at least one of the servers (not shown).

As a block diagram showing an example of the terminal 100 and the base station 200 shown in FIG. 14, the separated blocks are shown by logically distinguishing elements of the device. Accordingly, the elements of the above-described device may be mounted as one chip or as a plurality of chips according to the design of the device. In addition, some components of the terminal 100, for example, the user interface 140 and the display 150 may be selectively provided in the terminal 100. In addition, the user interface 140 and the display 150 may be additionally provided in the base station 200 as necessary.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiment, or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. -A hardware device specially configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operation of the embodiment, and vice versa.

The software may include a computer program, code, instructions, or a combination of one or more of these, configuring the processing unit to operate as desired or processed independently or collectively. You can command the device. Software and/or data may be interpreted by a processing device or, to provide instructions or data to a processing device, of any type of machine, component, physical device, virtual equipment, computer storage medium or device. , Or may be permanently or temporarily embodyed in a transmitted signal wave. The software may be distributed over networked computer systems and stored or executed in a distributed manner. Software and data may be stored on one or more computer-readable recording media.

As described above, although the embodiments have been described by the limited drawings, a person of ordinary skill in the art can apply various technical modifications and variations based on the above. For example, the described techniques are performed in a different order from the described method, and/or components such as systems, structures, devices, circuits, etc. described are combined or combined in a form different from the described method, or other components Alternatively, even if substituted or substituted by an equivalent, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and claims and equivalents fall within the scope of the following claims.

Claims (18)

Measuring resource usage in a frequency domain based on a demodulation reference signal (DM-RS) transmitted from a base station; And
Measuring resource usage in a time domain based on the demodulation reference signal (DM-RS)
Resource usage measurement method comprising a.
The method of claim 1,
Measuring resource usage in the frequency domain,
Detecting the number of resource blocks included in a resource block group allocated for physical downlink shared channel (PDSCH) scheduling; And
Checking whether the DM-RS is transmitted in a symbol in which the DM-RS is likely to be transmitted in units of the resource block group
Resource usage measurement method comprising a.
The method of claim 2,
The detecting step,
Determining a configuration of a bandwidth part (BWP) used by the base station;
Detecting the number of resource blocks included in the resource block group based on the configuration of the BWP; And
Resource usage measurement method comprising a.
The method of claim 2,
The step of confirming,
Checking whether the DM-RS has been transmitted based on a correlation in units of the resource block
Resource usage measurement method comprising a.
The method of claim 1,
Measuring the frequency domain resource usage comprises:
Detecting the index of the first resource block allocated for physical downlink shared channel (PDSCH) scheduling and the number of consecutive resource blocks
Resource usage measurement method comprising a.
The method of claim 1,
The step of measuring the resource usage in the time domain,
Detecting a DM-RS in the symbol;
Determining PDSCH scheduling allocation combinations based on the index of the symbol from which the DM-RS is detected; And
Determining a combination of symbols in which the DM-RS of the PDSCH is located among the combinations
Resource usage measurement method comprising a.
The method of claim 6,
The detecting step,
Monitoring symbols in which the DM-RS of the PDSCH can be located
Resource usage measurement method comprising a.
The method of claim 6,
The determining step,
Determining the combination based on the received power of the symbols
Resource usage measurement method comprising a.
The method of claim 6,
The determining step,
Determining the combination based on a constellation of a signal transmitted in the symbols
Resource usage measurement method comprising a.
A memory containing instructions; And
A processor for executing the instructions
Including,
When the instructions are executed by the processor, the processor,
Measuring resource usage in a frequency domain based on a demodulation reference signal (DM-RS) transmitted from a base station, and measuring resource usage in a time domain based on the demodulation reference signal (DM-RS)
Resource usage measurement device.
The method of claim 10,
The processor,
It is possible to detect the number of resource blocks included in a resource block group allocated for physical downlink shared channel (PDSCH) scheduling, and to transmit the DM-RS in units of the resource block group. Checking whether the DM-RS is transmitted in the symbol
Resource usage measurement device.
The method of claim 11,
The processor,
Determining the configuration of the bandwidth part (BWP) used by the base station, and detecting the number of resource blocks included in the resource block group based on the configuration of the BWP
Resource usage measurement device.
The method of claim 11,
The processor,
Checking whether the DM-RS has been transmitted based on a correlation in units of the resource block
Resource usage measurement device.
The method of claim 10,
The processor,
Detecting the index of the first resource block allocated to the PDSCH (physical downlink shared channel) scheduling and the number of consecutive resource blocks
Resource usage measurement device.
The method of claim 10,
The processor,
Detecting a DM-RS in a symbol, determining PDSCH scheduling allocation combinations based on the index of the symbol in which the DM-RS is detected, and determining a combination of symbols in which the DM-RS of the PDSCH is located among the combinations
Resource usage measurement device.
The method of claim 15,
The processor,
Monitoring symbols in which the DM-RS of the PDSCH can be located
Resource usage measurement device.
The method of claim 15,
The processor,
Determining the combination based on the received power of the symbols
Resource usage measurement device.
The method of claim 15,
The processor,
Determining the combination based on the constellation of the signals transmitted in the symbols
Resource usage measurement device.

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