KR20230046173A - Method and apparatus for configuring synchronization signal based on small bandwidth - Google Patents

Abstract

The present disclosure relates to a communication technique for integrating a 5G communication system for supporting higher data transmission rates after 4G systems with IoT technology and a system thereof. The present disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, and security and safety-related services) based on the 5G communication technology and IoT-related technology. The present disclosure also relates to a method and an apparatus performing the same. The method is performed by a base station of a wireless communication system and comprises: a step of identifying whether a frequency band operated by the base station uses a smaller bandwidth than a preset bandwidth; a step of determining smaller subcarrier spacing (SCS) than preset SCS if a bandwidth smaller than the preset bandwidth is used; a step of using the determined SCS to generate a synchronization signal block (SSB); and a step of transmitting the SSB. The determined SCS is smaller than 15 kHz.

Description

Bandwidth-based synchronization signal configuration method and apparatus {METHOD AND APPARATUS FOR CONFIGURING SYNCHRONIZATION SIGNAL BASED ON SMALL BANDWIDTH}

The present invention relates to a method and apparatus for configuring a synchronization signal based on bandwidth. More specifically, the present invention relates to a method and apparatus for designing and configuring a synchronization signal so that a wireless communication system (eg, 5G, new radio (NR)) can operate even in a smaller bandwidth.

Efforts are being made to develop an improved 5G communication system or pre-5G communication system to meet the growing demand for wireless data traffic after the commercialization of the 4G communication system. For this reason, the 5G communication system or pre-5G communication system is being called a Beyond 4G Network communication system or a Post LTE system. In order to achieve a high data rate, the 5G communication system is being considered for implementation in a mmWave band (eg, a 60 gigabyte (60 GHz) band). In order to mitigate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used in 5G communication systems. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, to improve the network of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), and an ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation etc. are being developed. In addition, in the 5G system, advanced coding modulation (Advanced Coding Modulation: ACM) methods FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), advanced access technologies FBMC (Filter Bank Multi Carrier), NOMA (non orthogonal multiple access) and SCMA (sparse code multiple access) are being developed.

On the other hand, the Internet is evolving from a human-centered connection network in which humans create and consume information to an Internet of Things (IoT) network in which information is exchanged and processed between distributed components such as things. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with a cloud server, etc., is also emerging. In order to implement IoT, technical elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, sensor networks for connection between objects and machine to machine , M2M), and MTC (Machine Type Communication) technologies are being studied. In the IoT environment, intelligent IT (Internet Technology) services that create new values in human life by collecting and analyzing data generated from connected objects can be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliances, advanced medical service, etc. can be applied to

Accordingly, 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. will be. The application of the cloud radio access network (cloud RAN) as the big data processing technology described above can be said to be an example of convergence of 5G technology and IoT technology.

A technical problem to be achieved in various embodiments of the present disclosure is to provide a method and apparatus for operating a wireless communication system based on bandwidth.

In addition, technical problems to be achieved in various embodiments of the present disclosure are a synchronization method for operating a wireless communication system in a smaller bandwidth, setting parameters for supporting a smaller bandwidth, and a method and apparatus for performing communication using the same. is to provide

According to an embodiment of the present disclosure, in a method performed by a base station of a wireless communication system, identifying whether a frequency band operated by the base station uses a bandwidth smaller than a preset bandwidth; determining an SCS smaller than a preset subcarrier spacing (SCS) when using a bandwidth smaller than the preset bandwidth; generating a synchronization signal block (SSB) using the determined SCS; and transmitting the SSB, wherein the determined SCS is smaller than 15 kHz.

In addition, according to an embodiment of the present disclosure, in a method performed by a terminal of a wireless communication system, identifying whether a frequency band accessed by the terminal uses a bandwidth smaller than a preset bandwidth; determining an SCS smaller than a preset subcarrier spacing (SCS) when using a bandwidth smaller than the preset bandwidth; and acquiring a synchronization signal block (SSB) using the determined SCS, wherein the determined SCS is smaller than 15 kHz.

In addition, according to an embodiment of the present disclosure, in a base station of a wireless communication system, it is identified whether a frequency band operated by a transceiver and the base station uses a bandwidth smaller than a preset bandwidth, and In the case of using a bandwidth of this size, a control unit for determining an SCS smaller than a preset subcarrier spacing (SCS), generating a synchronization signal block (SSB) using the determined SCS, and controlling transmission of the SSB, , the determined SCS can provide a base station characterized in that less than 15 kHz.

In addition, according to an embodiment of the present disclosure, in a terminal of a wireless communication system, it is identified whether a frequency band accessed by a transceiver and the terminal uses a bandwidth smaller than a preset bandwidth, and In the case of using a bandwidth of this size, a control unit that determines an SCS smaller than a preset SCS (subcarrier spacing) and controls to acquire a synchronization signal block (SSB) using the determined SCS, wherein the determined SCS is 15 It is possible to provide a terminal characterized in that it is smaller than kHz.

The technical problems to be achieved in various embodiments of the present disclosure are not limited to the above-mentioned technical problems, and other technical problems not mentioned are to those of ordinary skill in the art to which the present invention belongs from the description below. will be clearly understood.

According to various embodiments of the present disclosure, a method and apparatus for operating a wireless communication system based on bandwidth may be provided.

In addition, according to various embodiments of the present disclosure, it is possible to provide a synchronization method for operating a wireless communication system in a smaller bandwidth, a method and apparatus for setting a parameter to support a smaller bandwidth, and performing communication using the same. there is.

1 is a diagram showing the structure of a next-generation mobile communication system according to an embodiment of the present disclosure.
2 is a diagram illustrating a radio protocol structure of a next-generation mobile communication system according to an embodiment of the present disclosure.
3 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in a 5G communication system according to an embodiment of the present disclosure.
4 is a diagram illustrating an example of a slot structure considered in a 5G system according to an embodiment of the present disclosure.
5 is a diagram illustrating an example of setting for a bandwidth part in a 5G communication system according to an embodiment of the present disclosure.
6 is a diagram illustrating an example in which frequency and time resources are allocated for information transmission in an NR system according to an embodiment of the present disclosure.
FIG. 7 is a diagram showing how synchronization signals and physical broadcast channels of an NR system according to an embodiment of the present disclosure are mapped in frequency and time domains.
8 is a diagram illustrating an SSB configuration according to subcarrier intervals according to an embodiment of the present disclosure.
9 is a diagram showing which symbols within a slot the one SS/PBCH block is mapped to according to an embodiment of the present disclosure.
9 is a diagram illustrating symbols capable of transmitting SS/PBCH blocks according to subcarrier intervals according to an embodiment of the present disclosure.
10 is a diagram illustrating a problem that occurs because subcarrier intervals are different in different communication systems according to an embodiment of the present disclosure.
11 is a diagram illustrating a structure of a discontinuous SSB according to an embodiment of the present disclosure.
12 is a diagram illustrating symbols in which SS/PBCH blocks can be transmitted according to subcarrier intervals according to an embodiment of the present disclosure.
13 is another diagram illustrating symbols capable of transmitting SS/PBCH blocks according to subcarrier intervals according to an embodiment of the present disclosure.
14 is a diagram illustrating an operation of a terminal according to various embodiments of the present disclosure.
15 is a diagram illustrating an operation of a base station according to various embodiments of the present disclosure.
16 is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure.
17 is a diagram illustrating the structure of a base station according to an embodiment of the present disclosure.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. At this time, it should be noted that the same components in the accompanying drawings are indicated by the same reference numerals as much as possible. In addition, detailed descriptions of well-known functions and configurations that may obscure the subject matter of the present invention will be omitted.

In describing the embodiments in this specification, descriptions of technical contents that are well known in the technical field to which the present invention pertains and are not directly related to the present invention will be omitted. This is to more clearly convey the gist of the present invention without obscuring it by omitting unnecessary description.

For the same reason, in the accompanying drawings, some components are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In each figure, the same reference number is assigned to the same or corresponding component.

Advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the present embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

At this time, it will be understood that each block of the process flow chart diagrams and combinations of the flow chart diagrams can be performed by computer program instructions. These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates means to perform functions. These computer program instructions may also be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular way, such that the computer usable or computer readable memory The instructions stored in are also capable of producing an article of manufacture containing instruction means that perform the functions described in the flowchart block(s). The computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to generate computer or other programmable data processing equipment. Instructions for performing processing equipment may also provide steps for performing the functions described in the flowchart block(s).

Additionally, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is possible for the functions mentioned in the blocks to occur out of order. For example, two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in reverse order depending on their function.

At this time, the term '~unit' used in this embodiment means software or a hardware component such as FPGA or ASIC, and '~unit' performs certain roles. However, '~ part' is not limited to software or hardware. '~bu' may be configured to be in an addressable storage medium and may be configured to reproduce one or more processors. Therefore, as an example, '~unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. Functions provided within components and '~units' may be combined into smaller numbers of components and '~units' or further separated into additional components and '~units'. In addition, components and '~units' may be implemented to play one or more CPUs in a device or a secure multimedia card.

Hereinafter, a base station is a subject that performs resource allocation of a terminal, and is at least one of a Node B, a base station (BS), an eNode B (eNB), a gNode B (gNB), a radio access unit, a base station controller, or a node on a network. can The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing communication functions. In addition, the embodiments of the present disclosure can be applied to other communication systems having a similar technical background or channel type to the embodiments of the present disclosure described below. In addition, the embodiments of the present disclosure can be applied to other communication systems through some modification within a range that does not greatly deviate from the scope of the present disclosure as determined by those skilled in the art. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in this, and the following 5G may be a concept including existing LTE, LTE-A and other similar services there is. In addition, the present disclosure can be applied to other communication systems through some modifications within a range that does not greatly deviate from the scope of the present disclosure as determined by those skilled in the art.

A term used in the following description for identifying a connection node, a term referring to a network entity or network function (NF), a term referring to messages, a term referring to an interface between network objects, and various Terms referring to identification information are illustrated for convenience of explanation. Therefore, the present invention is not limited to the terms described below, and other terms indicating objects having equivalent technical meanings may be used.

For convenience of description below, terms and names defined in the 3rd generation partnership project (3GPP) long term evolution (LTE) standard and/or 3GPP new radio (NR) standard may be partially used. However, the present invention is not limited by the above terms and names, and may be equally applied to systems conforming to other standards.

1 is a diagram showing the structure of a next-generation mobile communication system according to an embodiment of the present disclosure.

Referring to FIG. 1, a radio access network of a next-generation mobile communication system (hereinafter referred to as NR or 5g) includes a new radio node B (hereinafter referred to as NR gNB or NR base station) 110 and a next-generation radio core network (new radio core network, NR CN) (105). A next-generation radio user equipment (new radio user equipment, NR UE or terminal) 115 may access an external network through the NR gNB 110 and the NR CN 105 .

In FIG. 1 , the NR gNB 110 may correspond to an evolved node B (eNB) of an existing LTE system. The NR gNB is connected to the NR UE 115 through a radio channel and can provide more advanced services than the existing Node B. In a next-generation mobile communication system, all user traffic can be serviced through a shared channel. Therefore, a device for performing scheduling by collecting status information such as buffer status, available transmission power status, and channel status of UEs is required, and the NR gNB 110 can take charge of this. One NR gNB can control multiple cells. In a next-generation mobile communication system, a bandwidth higher than the current maximum bandwidth may be applied in order to implement high-speed data transmission compared to current LTE. In addition, a beamforming technology may be additionally applied using orthogonal frequency division multiplexing (OFDM) as a radio access technology. In addition, an adaptive modulation & coding (AMC) method for determining a modulation scheme and a channel coding rate according to a channel condition of a terminal may be applied.

The NR CN 105 may perform functions such as mobility support, bearer setup, and QoS setup. The NR CN is a device in charge of various control functions as well as a mobility management function for a terminal, and can be connected to a plurality of base stations. In addition, the next-generation mobile communication system can be interworked with the existing LTE system, and the NR CN can be connected to the MME 125 through a network interface. The MME may be connected to the eNB 130, which is an existing base station.

2 is a diagram illustrating a radio protocol structure of a next-generation mobile communication system according to an embodiment of the present disclosure.

Referring to FIG. 2, the radio protocols of the next-generation mobile communication system include NR service data adaptation protocol (SDAP) 201 and 245, NR PDCP (packet data convergence protocol) 205, 240), NR RLCs 210 and 235, NR medium access control (MAC) 215 and 230, and NR physical (PHY) 220 and 225.

The main functions of the NR SDAPs 201 and 245 may include some of the following functions.

- Transfer of user plane data

- A mapping function between a QoS flow and a data bearer for uplink and downlink (mapping between a QoS flow and a DRB for both DL and UL)

- Marking QoS flow ID for uplink and downlink (marking QoS flow ID in both DL and UL packets)

- Function of mapping reflective QoS flow to data bearer for UL SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

For the SDAP layer device, the UE uses a radio resource control (RRC) message for each PDCP layer device, each bearer, or each logical channel Whether to use the header of the SDAP layer device or whether to use the function of the SDAP layer device can be set. When the SDAP header is set, the UE reflects the SDAP header's non-access stratum (NAS) quality of service (QoS) setting 1-bit indicator (NAS reflective QoS) and access stratum (AS) QoS With a configuration 1-bit indicator (AS reflective QoS), the terminal can be instructed to update or reset mapping information for uplink and downlink QoS flows and data bearers. The SDAP header may include QoS flow ID information indicating QoS. QoS information may be used as data processing priority and scheduling information to support smooth service.

The main functions of the NR PDCPs 205 and 240 may include some of the following functions.

- Header compression and decompression (ROHC only)

- Transfer of user data

- In-sequence delivery of upper layer PDUs

- Out-of-sequence delivery of upper layer PDUs

- PDCP PDU reordering for reception

- Duplicate detection of lower layer SDUs

- Retransmission of PDCP SDUs

- Ciphering and deciphering

- Timer-based SDU discard in uplink.

In the above description, the reordering function of the NR PDCP device may refer to a function of reordering PDCP PDUs received from a lower layer in order based on a PDCP sequence number (SN). The reordering function of the NR PDCP device may include a function of delivering data to the upper layer in the rearranged order, and may include a function of directly delivering data without considering the order, and rearranging the order to It may include a function of recording PDCP PDUs, may include a function of reporting the status of lost PDCP PDUs to the transmitting side, and may include a function of requesting retransmission of lost PDCP PDUs. .

The main functions of the NR RLCs 210 and 235 may include some of the following functions.

- Transfer of upper layer PDUs

- In-sequence delivery of upper layer PDUs

- Out-of-sequence delivery of upper layer PDUs

- ARQ function (Error Correction through ARQ)

- Concatenation, segmentation and reassembly of RLC SDUs

- Re-segmentation of RLC data PDUs

- Reordering of RLC data PDUs

- Duplicate detection

- Error detection function (Protocol error detection)

- RLC SDU discard function (RLC SDU discard)

- RLC re-establishment

In the above description, the in-sequence delivery function of the NR RLC device may refer to a function of sequentially delivering RLC SDUs received from a lower layer to an upper layer. Originally, when one RLC SDU is divided into several RLC SDUs and received, the in-sequence delivery function of the NR RLC device may include a function of reassembling and delivering them.

The in-sequence delivery function of the NR RLC device may include a function of rearranging received RLC PDUs based on an RLC sequence number (SN) or a PDCP sequence number (SN), and rearranging the order results in loss It may include a function of recording lost RLC PDUs, a function of reporting the status of lost RLC PDUs to the transmitting side, and a function of requesting retransmission of lost RLC PDUs. there is.

In-sequence delivery of the NR RLC (210, 235) device may include a function of sequentially delivering only RLC SDUs prior to the lost RLC SDU to the upper layer when there is a lost RLC SDU. can In addition, the in-sequence delivery function of the NR RLC device, if a predetermined timer expires even if there is a lost RLC SDU, all RLC SDUs received before the timer starts are sequentially delivered to the upper layer. can do. In addition, the in-sequence delivery function of the NR RLC device may include a function of sequentially delivering all RLC SDUs received so far to the upper layer if a predetermined timer expires even if there is a lost RLC SDU. .

The NR RLC (210, 235) devices may process RLC PDUs in the order they are received and deliver them to the NR PDCP (205, 240) devices regardless of the order of sequence numbers (out of sequence delivery).

When the NR RLC (210, 235) device receives a segment, the segments stored in the buffer or to be received later are received, reconstructed into one complete RLC PDU, and then transmitted to the NR PDCP device. there is.

The NR RLC layer may not include a concatenation function, and may perform a function in the NR MAC layer or may be replaced with a multiplexing function of the NR MAC layer.

In the above description, the out-of-sequence delivery function of the NR RLC device may mean a function of immediately delivering RLC SDUs received from a lower layer to an upper layer regardless of order. The out-of-sequence delivery function of the NR RLC device may include a function of reassembling and delivering, when originally one RLC SDU is divided into several RLC SDUs and received. The out-of-sequence delivery function of the NR RLC device may include a function of storing RLC SNs or PDCP SNs of received RLC PDUs and arranging the order to record lost RLC PDUs.

The NR MACs 215 and 230 may be connected to several NR RLC layer devices configured in one terminal, and the main functions of the NR MAC may include some of the following functions.

- Mapping between logical channels and transport channels

- Multiplexing/demultiplexing of MAC SDUs

- Scheduling information reporting

- HARQ function (Error correction through HARQ (hybrid automatic repeat request))

- Priority handling between logical channels of one UE

- Priority handling between UEs by means of dynamic scheduling

- MBMS service identification

- Transport format selection

- Padding function (Padding)

The NR PHY layers 220 and 225 channel code and modulate higher layer data, convert OFDM symbols into OFDM symbols and transmit them through a radio channel, or demodulate and channel decode OFDM symbols received through a radio channel to transmit to a higher layer. can be done

Hereinafter, the frame structure of the 5G system will be described in more detail with reference to the drawings.

3 is a diagram showing a basic structure of a time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in a 5G system.

(일례로 12)개의 연속된 RE들은 하나의 자원 블록(resource block, RB)(304)을 구성할 수 있다. 3, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in the time and frequency domains is a resource element (RE) 301, consisting of 1 orthogonal frequency division multiplexing (OFDM) symbol 302 on the time axis and 1 subcarrier 303 on the frequency axis. can be defined in the frequency domain

(For example, 12) consecutive REs may constitute one resource block (RB) 304 .

4 is a diagram showing an example of a slot structure considered in a 5G system.

)=14). 1 서브프레임(401)은 하나 또는 복수 개의 슬롯(402, 403)으로 구성될 수 있으며, 1 서브프레임(401)당 슬롯(402, 403)의 개수는 부반송파 간격에 대한 설정 값 μ(404, 405)에 따라 다를 수 있다. 도 4의 일 예에서는 부반송파 간격 설정 값으로 μ=0(404)인 경우와 μ=1(405)인 경우가 도시되어 있다. μ=0(404)일 경우, 1 서브프레임(401)은 1개의 슬롯(402)으로 구성될 수 있고, μ=1(405)일 경우, 1 서브프레임(401)은 2개의 슬롯(403)으로 구성될 수 있다. 즉 부반송파 간격에 대한 설정 값 μ에 따라 1 서브프레임 당 슬롯 수(

)가 달라질 수 있고, 이에 따라 1 프레임 당 슬롯 수(

)가 달라질 수 있다. 각 부반송파 간격 설정 μ에 따른

및

는 하기의 표 1로 정의될 수 있다.4 shows an example of a structure of a frame 400 , a subframe 401 , and a slot 402 . One frame 400 may be defined as 10 ms. One subframe 401 may be defined as 1 ms, and therefore, one frame 400 may consist of a total of 10 subframes 401 . One slot (402, 403) may be defined as 14 OFDM symbols (that is, the number of symbols per slot (

)=14). 1 subframe 401 may consist of one or a plurality of slots 402 and 403, and the number of slots 402 and 403 per 1 subframe 401 is a set value for the subcarrier interval μ(404, 405 ) may vary. In an example of FIG. 4, the case where μ = 0 (404) and the case where μ = 1 (405) are shown as the subcarrier interval setting value. When μ = 0 (404), 1 subframe 401 may consist of one slot 402, and when μ = 1 (405), 1 subframe 401 may consist of two slots 403 may consist of That is, the number of slots per 1 subframe according to the setting value μ for the subcarrier interval (

) may vary, and accordingly, the number of slots per frame (

) may vary. According to each subcarrier spacing setting μ

and

Can be defined in Table 1 below.

[Table 1]

Next, a bandwidth part (BWP) setting in the 5G communication system will be described in detail with reference to FIG. 5 .

5 is a diagram showing an example of setting for a bandwidth portion in a 5G communication system.

5 shows an example in which the UE bandwidth 500 is set to two bandwidth parts, that is, bandwidth part # 1 (BWP # 1) 501 and bandwidth part # 2 (BWP # 2) 502. has been The base station may set one or a plurality of bandwidth parts to the terminal, and may set information such as Table 2 below for each bandwidth part. The following BWP may be referred to as BWP setting information.

[Table 2]

Of course, it is not limited to the above example, and various parameters related to the bandwidth part may be set in the terminal in addition to the setting information. The information may be transmitted from the base station to the terminal through higher layer signaling, for example, RRC signaling. At least one bandwidth part among one or a plurality of set bandwidth parts may be activated. Whether or not the set bandwidth portion is activated may be semi-statically transmitted from the base station to the terminal through RRC signaling or dynamically transmitted through downlink control information (DCI).

According to some embodiments, a terminal before RRC connection may receive an initial bandwidth portion (initial BWP) for initial access from a base station through a master information block (MIB). More specifically, in the initial access step, the terminal receives system information (remaining system information; RMSI or system information block 1; may correspond to SIB1) necessary for initial access through the MIB. PDCCH for reception can be transmitted Setting information on a control resource set (CORESET) and a search space (search space) may be received. The control resource set and search space set by MIB can be regarded as identity (ID) 0, respectively. The base station may notify the terminal of setting information such as frequency allocation information, time allocation information, and numerology for the control resource set #0 through the MIB. In addition, the base station may notify the terminal of setting information on the monitoring period and occasion for the control resource set #0, that is, setting information on the search space #0, through the MIB. The terminal may regard the frequency domain set as the control resource set #0 acquired from the MIB as an initial bandwidth part for initial access. At this time, the identifier (ID) of the initial bandwidth part may be regarded as 0.

For MIB information, refer to the examples in Table 3 below. The terminal can identify a CORESET#0 (Control Resource Set #0) to which a PDCCH scheduling a PDSCH to which a System Information Block (SIB1) is transmitted can be transmitted through the value of the PDCCH-ConfigSIB1 parameter included in the received MIB. .

[Table 3]

The setting for the portion of the bandwidth supported by 5G can be used for various purposes.

According to some embodiments, when the bandwidth supported by the terminal is smaller than the system bandwidth, it can be supported through the bandwidth portion setting. For example, when the base station sets the frequency position (configuration information 2) of the bandwidth part to the terminal, the terminal can transmit and receive data at a specific frequency position within the system bandwidth.

Also, according to some embodiments, the base station may set a plurality of bandwidth parts to the terminal for the purpose of supporting different numerologies. For example, in order to support both data transmission and reception using a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz to a terminal, two bandwidth parts may be set to subcarrier spacings of 15 kHz and 30 kHz, respectively. Different bandwidth parts may be frequency division multiplexed, and when data is to be transmitted/received at a specific subcarrier interval, a bandwidth portion set at a corresponding subcarrier interval may be activated.

Also, according to some embodiments, for the purpose of reducing the power consumption of the terminal, the base station may set bandwidth parts having different sizes of bandwidth to the terminal. For example, when a terminal supports a very large bandwidth, for example, a bandwidth of 100 MHz and always transmits and receives data with the corresponding bandwidth, very large power consumption may occur. In particular, monitoring an unnecessary downlink control channel with a large bandwidth of 100 MHz in the absence of traffic may be very inefficient in terms of power consumption. For the purpose of reducing power consumption of the terminal, the base station may set a bandwidth part of a relatively small bandwidth, for example, a bandwidth part of 20 MHz for the terminal. In a situation where there is no traffic, the terminal can perform a monitoring operation in the 20 MHz bandwidth part, and when data is generated, it can transmit and receive data in the 100 MHz bandwidth part according to the instructions of the base station.

In the method of setting the bandwidth part, terminals before RRC connection (connected) may receive setting information on the initial bandwidth part (initial bandwidth part) through the MIB in the initial access step. More specifically, the terminal may receive a control resource set (CORESET) for a downlink control channel through which a DCI for scheduling the SIB may be transmitted from the MIB of a physical broadcast channel (PBCH). The bandwidth of the control resource set set as the MIB may be regarded as an initial bandwidth part, and the terminal may receive the PDSCH through which the SIB is transmitted through the set initial bandwidth part. The initial bandwidth portion may be used for other system information (OSI), paging, and random access in addition to the purpose of receiving the SIB.

6 is a diagram illustrating an example in which frequency and time resources are allocated for information transmission in an NR system according to an embodiment of the present disclosure.

Referring to FIG. 6 , it is possible to check how frequency and time resources are allocated for information transmission in each system. First, resources for data for eMBB, URLLC, and mMTC are allocated in the entire system frequency band (600). Resources (601) allocated for eMBB and resources (609) allocated for mMTC are allocated in a specific frequency band and URLLC data (603, 605, 607) are generated and transmission is required while being transmitted, allocated for eMBB The URLLC data 603, 605, and 607 may be transmitted without emptying the previously allocated resources 601 and the resources 609 allocated for mMTC or without transmission. Among the above services, since URLLC needs to reduce latency, URLLC data can be allocated (603, 605, 607) to a part of the resource 601 allocated for eMBB and transmitted. Of course, when URLLC is additionally allocated and transmitted in the resource 601 allocated for eMBB, eMBB data may not be transmitted in overlapping frequency-time resources, and thus transmission performance of eMBB data may be lowered. That is, in the above case, eMBB data transmission failure may occur due to URLLC allocation.

In addition, the entire system frequency band 620 can be divided and used to transmit services and data in each subband 622 , 624 , and 626 . Information related to the subband configuration may be determined in advance, and the base station may transmit this information to the terminal through higher level signaling. Alternatively, the information related to the subband may be arbitrarily divided by the base station or the network node to provide services to the terminal without transmitting separate subband configuration information. Subband 622 is used for eMBB data transmission (608), subband 624 is used for URLLC data transmission (610, 612, 614), and subband 626 is used for mMTC data transmission (616).

Throughout the embodiments, the length of the transmission time interval (TTI) used for URLLC transmission may be shorter than the TTI length used for eMBB or mMTC transmission. In addition, the response of information related to URLLC can be transmitted faster than eMBB or mMTC, and thus information can be transmitted and received with low delay. The structure of a physical layer channel used for each type to transmit the three services or data may be different. For example, at least one of a length of a transmission time interval (TTI), a frequency resource allocation unit, a structure of a control channel, and a data mapping method may be different.

Although three services and three types of data have been described above, more types of services and corresponding data may exist, and the contents of the present invention may be applied even in this case. It is a diagram showing how synchronization signals and physical broadcasting channels of the NR system according to the embodiment are mapped in the frequency and time domains.

In the 5G communication system, SSB (Synchronization Signal Block) is provided for synchronization (time / frequency) of the terminal. The one SSB may include a Primary Synchronization Signal (PSS) 701, a Secondary Synchronization Signal (SSS) 703), and a Physical Broadcast Channel (PBCH) 705. A base station supporting the 5G communication system may transmit at least one SSB. A terminal supporting the 5G communication system may perform synchronization with the base station by receiving at least one SSB. An SSB composed of PSS 701, SSS 703, and PBCH 705 is mapped over 4 OFDM symbols on the time axis. PSS 701 and SSS 703 are mapped to 12 RBs on the frequency axis, and PBCH 705 is mapped to 20 RBs on the frequency axis. Since one RB includes 12 subcarriers, when the subcarrier spacing (SCS) changes, the size of the RB changes, and when the size of the RB changes, the size of the frequency band occupied by 12RB and 20RB may change. there is. The table of FIG. 7 shows how the frequency band (size of SSB frequency band) of 20 RBs changes according to the subcarrier spacing. When the SCS is 15 kHz, the frequency band of one SSB has a bandwidth of 15 kHz * 12 * 20 = 3.6 MHz, and when the SCS is 30 kHz, one SSB has a bandwidth of 30 kHz * 12 * 20 = 7.2 MHz. A resource region in which the PSS 701, SSS 703, and PBCH 705 are transmitted may be referred to as an SS/PBCH block. Also, the SS/PBCH block may be referred to as an SSB block.

The terminal may obtain information (eg, PDCCH-ConfigSIB1) for a PDCCH for receiving system information (eg, SIB1) necessary for initial access through the MIB of the PBCH. PDCCH-COnfigSIB1 may include configuration information about a control resource set (CORESET) through which the PDCCH can be transmitted and a search space. The control resource set and search space set by the MIB can be regarded as CORESET#0 and search space #0, respectively. The base station transmits frequency allocation information (for example, the number of RBs), time allocation information (for example, the number of symbols), numerology, and the first SSB of the control resource set #0 through the MIB to the terminal. Setting information such as an offset between an index of a common RB overlapping an RB and the smallest RB of CORESET#0 may be notified. In addition, the base station may notify the terminal of setting information on the monitoring period and occasion for the control resource set #0, that is, setting information on the search space #0, through the MIB.

Meanwhile, according to the current standard, the minimum number of RBs that can be set with CORESET#0 is 24, and the minimum interval of subcarrier intervals that can be set is 15 kHz. Therefore, when 15 kHz is used as the subcarrier interval, the minimum bandwidth of CORESET#0 may have 4.32 MHz (15 kHz * 12 * 25).

Considering the aforementioned minimum bandwidth (3.6 MHz) of SSB and minimum bandwidth (4.32 MHz) of CORESET#0, a bandwidth smaller than 4.32 MHz (e.g., 3 MHz to 4 MHz, but not limited to, less than 3 MHz bandwidth) may be) has a problem that cannot be operated because the size is smaller than the minimum bandwidth of SSB or the minimum bandwidth of CORESET#0. Therefore, a solution for operating a service in a small bandwidth cannot be upgraded to a NR network in a system such as LTE.

Various embodiments of the present invention provide a method of newly defining a subcarrier interval smaller than 15 kHz and changing and setting various parameters according to changes in SSB design and subcarrier interval when this is defined.

In various embodiments of the present disclosure, a new subcarrier spacing supported by the mobile communication system may be added. The new subcarrier spacing may be a subcarrier spacing smaller than 15 kHz, for example, 7.5 kHz (μ = -1), 3.75 kHz (μ = -2), and the like. In the following description, for convenience of explanation, the subcarrier spacing is 7.5 kHz, but various embodiments of the present invention can be applied to various subcarrier spacings smaller than 7.5 kHz.

8 is a diagram illustrating an SSB configuration according to subcarrier intervals according to an embodiment of the present disclosure.

The general configuration and contents of the SSB refer to the description of FIG. 7 . Referring to FIG. 8, it can be seen that the SSB bandwidth size and symbol size are different when the subcarrier interval is 15 kHz and when the subcarrier interval is 7.5 kHz. That is, the number of RBs constituting the SSB (20) and the number of OFDM symbols (4) are the same, but since the subcarrier spacing and the size of the OFDM symbol are different, the size of the frequency axis of the SSB and the time axis of the SSB You can see that the size changes. Specifically, when the subcarrier spacing is reduced from 15 kHz to 7.5 kHz, the size of the frequency axis of the SSB is reduced by 1/2, and the size of the time axis of the SSB is doubled.

A base station according to an embodiment of the present disclosure may generate and transmit channels and signals at a subcarrier spacing (μ) of 7.5 kHz. For example, the base station may generate and transmit by setting the subcarrier spacing of subcarriers used for transmission of each signal and channel included in SSB (PSS, SSS, PBCH) to 7.5 kHz. Accordingly, the bandwidth of SSB can be 7.5kHz * 12 * 20 = 1.8MHz.

According to an embodiment of the present disclosure, a subcarrier interval for CORESET#0 may be set according to the subcarrier interval of SSB. The base station may set the subcarrier spacing of CORESET#0 corresponding to the subcarrier spacing of SSB (the subcarrier spacing of SSB and the subcarrier spacing of CORESET#0 may be the same). For example, if the subcarrier interval of the SSB is 7.5 kHz, the base station may set the resource of CORESET#0 to 7.5 kHz and transmit the setting for CORESET#0 to the terminal. In addition, the base station may set the subcarrier spacing of a subcarrier to which the PDCCH transmitted through the CORESET#0 is mapped to 7.5 kHz, generate control information, and transmit it through the PDCCH. When a subcarrier spacing of 7.5 kHz is applied, the minimum bandwidth of CORESET#0 may be 7.5 kHz * 12 * 24 = 2.16 MHz. Information on the subcarrier interval for the CORESET#0 may be included in the MIB or PDCCH-ConfigSIB1 of the MIB and transmitted. For example, the information on the subcarrier interval is whether or not the subcarrier interval of SSB and the subcarrier interval of CORESET#0 are the same (eg, indicating whether they are identical using 1-bit information), multiple relationship (n bits It may include at least one of information such as indicating a multiple relationship such as 1/2, 1, 2, 4 times, etc. using information.

A base station according to an embodiment of the present disclosure may identify (identify, obtain) a frequency bandwidth of a frequency band to be operated in the base station. If the frequency bandwidth is less than or less than a specific threshold, the base station can generate and transmit channels and signals using a subcarrier interval smaller than 15 kHz (eg, 7.5 kHz). In addition, a base station according to an embodiment of the present disclosure may identify a frequency band to be operated in the base station. If the identified frequency band is a specific frequency band (eg, band 8) or less than a preset bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less), a subcarrier interval of a size smaller than 15 kHz Channels and signals can be created and transmitted using . For example, the base station may generate an SSB based on the determined subcarrier interval and create settings for CORESET#0.

A terminal according to an embodiment of the present disclosure may receive and process channels and signals transmitted using a subcarrier spacing (μ) of 7.5 kHz. For example, the terminal may receive and process subcarrier spacing assuming that the subcarrier used for transmission of each signal and channel included in the SSB (PSS, SSS, PBCH) is 7.5 kHz. The UE may determine the subcarrier spacing assumed for reception and processing of SSB (PSS, SSS, PBCH) according to the operating frequency band and / or bandwidth. For example, when the frequency band to which the terminal wants to access corresponds to a specific frequency band (e.g. band 8) or a band supporting a bandwidth less than or equal to a preset bandwidth, the terminal determines that the subcarrier interval used in the corresponding band is 7.5 kHz. , and assuming that a subcarrier spacing of 15 kHz or more is used in other frequency bands, signals and data may be received and processed in the corresponding band. For example, if the frequency band corresponds to a specific frequency band (e.g. band 8) or a band supporting a bandwidth less than or equal to a preset bandwidth, the UE assumes that the SSB subcarrier spacing is 7.5 kHz (not limited to 7.5 kHz). subcarrier spacing smaller than 7.5 kHz may be used) SSB is received and SSB processing is successful, subcarrier spacing of CORESET#0 resource is assumed to be 7.5 kHz (not limited to 7.5 kHz, smaller than 7.5 kHz subcarrier spacing may be used) The resource of CORESET#0 can be identified (identify, obtained). The subcarrier spacing of CORESET#0 may follow the subcarrier spacing of SSB, or may be determined based on information about the subcarrier spacing for CORESET#0 included in the MIB.

9 is a diagram showing which symbols within a slot the one SS/PBCH block is mapped to according to an embodiment of the present disclosure.

Referring to FIG. 9, an example of a conventional LTE system using a subcarrier spacing of 15 kHz and an NR system using a subcarrier spacing of 30 kHz are shown, and a cell-specific reference signal always transmitted in the LTE system , CRSs) are designed to be transmitted in positions (901, 903, 905, 907) of the NR system SS/PBCH blocks (911, 913, 915, 917). This may be to allow the LTE system and the NR system to coexist in one frequency band.

10 is a diagram illustrating a problem caused by different subcarrier intervals in different communication systems according to an embodiment of the present disclosure.

Referring to FIG. 10, when LTE uses a subcarrier interval of 15 kHz and when a subcarrier smaller than 15 kHz (eg, 7.5 kHz) is used according to an embodiment of the present disclosure, SSB and CRS of LTE overlapping problems can be identified. CRSs transmitted in the 0th, 1st, 4th, 7th, 8th, and 11th OFDM symbols of every subframe of the LTE carrier are transmitted. Although the CRS and SSB do not overlap in the embodiment of FIG. 9 , when a small subcarrier interval is used in the embodiment of FIG. 10 , a problem in which the CRS and SSB overlap may occur in some symbols.

According to an embodiment of the present disclosure, in order to solve the above problem, the SSB may not be mapped to the resource to which the CRS is mapped in a symbol in which the SSB overlaps with the CRS. The NR base station may puncture a resource to which the CRS is mapped, and map an SSB to a resource to which the CRS is not mapped. To this end, the LTE base station and the NR base station operating the corresponding band may provide each other with information on resources through which the SSB is transmitted and resources through which the CRS is transmitted, and the problem of overlapping resources can be solved using this.

In addition, according to an embodiment of the present disclosure, in order to solve the above problem, an LTE base station may not transmit a CRS in a mapped resource to which an SSB is mapped. Since the LTE base station does not transmit the CRS in a specific frequency band of a specific symbol, the problem of overlapping CRS and SSB can be solved. To this end, the LTE base station and the NR base station operating the band can provide each other with information on resources through which SSB is transmitted and resources through which CRS is transmitted, and using this, SSB resources and CRS resources overlap. can solve

In addition, in order to solve the above problem, the SSB structure may be partially adjusted. An embodiment of adjusting the SSB structure will be described with reference to FIG. 11 .

11 is a diagram illustrating a structure of a discontinuous SSB according to an embodiment of the present disclosure.

Referring to FIG. 11, PSS, PBCH, and SSS of SSB are not mapped to consecutive symbols, but may be configured to be mapped to discontinuous symbols within one slot. That is, referring to the SSB structure of FIG. 7, the SSB in NR basically consists of 4 consecutive OFDM symbols. However, as described in FIG. 10, in order to solve a problem caused by a change in subcarrier interval, SSBs can be configured to be mapped to discontinuous symbols instead of contiguous symbols. In the embodiment of FIG. 11, the order in which PSS, PBCH, SSS, and PBCH are mapped in OFDM symbols is maintained, but when configuring discontinuous SSBs, the SSB structure is not limited thereto and the mapping order of PSS, SSS, and PBCH is changed. SSB can be configured by doing so.

12 is a diagram illustrating symbols in which SS/PBCH blocks can be transmitted according to subcarrier intervals according to an embodiment of the present disclosure.

Referring to FIG. 12, the subcarrier interval may be set to 15 kHz, 30 kHz, 120 kHz, 240 kHz, etc., and the position of a symbol where an SS/PBCH block (or SSB block) may be located may be determined according to each subcarrier interval. FIG. 12 shows positions of symbols in which SSBs can be transmitted according to subcarrier intervals in symbols within 1 ms, and SSBs do not always have to be transmitted in the area shown in FIG. 12 . Accordingly, the location where the SSB block is transmitted may be configured in the UE through system information or dedicated signaling.

13 is another diagram illustrating symbols capable of transmitting SS/PBCH blocks according to subcarrier intervals according to an embodiment of the present disclosure.

의 인덱스(index)를 오름차순(ascending order)로 가질 수 있다. L_max는 최대 전송 가능한 SSB의 개수를 의미하며 이는 band별로 정의될 수 있다(band-specific). 예를 들어, 3GHz 이하 대역에서는 4, 3~6GHz 대역에서는 8, 6GHz 이상의 대역에서는 64와 같을 수 있다.Each of at least one SSB(s) transmitted during one half frame (5 msec) through the 5G communication system is 0 to L _max -1

may have an index of in ascending order. L _max means the maximum number of transmittable SSBs, which can be defined for each band (band-specific). For example, it may be equal to 4 in a band of 3 GHz or less, 8 in a band of 3 to 6 GHz, and 64 in a band of 6 GHz or more.

Referring to FIG. 13, the subcarrier interval may be set to 15 kHz, 30 kHz, 120 kHz, 240 kHz, etc., and the position of a symbol where an SS/PBCH block (or SSB block) may be located may be determined according to each subcarrier interval. FIG. 13 shows positions of symbols in which SSB blocks can be transmitted according to subcarrier intervals in symbols within 5 ms, and the positions where the SSB blocks are transmitted are transmitted to the terminal through system information or dedicated signaling. can be set on In a region where the SS/PBCH block can be transmitted, the SS/PBCH block does not always have to be transmitted, and may or may not be transmitted according to the selection of the base station. Accordingly, the location where the SSB block is transmitted may be configured in the UE through system information or dedicated signaling.

According to various embodiments of the present disclosure, when a subcarrier spacing smaller than 15 kHz is used, for example, when 7.5 kHz is used as the subcarrier spacing of SSB, when the same number of Lmax is used, 15 kHz In this case, since most of the half frame is used for SSB transmission, it can be a problem.

Therefore, according to an embodiment of the present disclosure, when a subcarrier spacing smaller than 15 kHz is used, the Lmax value may be set to have a value smaller than 4. For example, a value of 1 or 2 may be used as the Lmax value. In this case (when a subcarrier interval smaller than 15 kHz is used, for example, when 7.5 kHz is used), the maximum number of SSBs transmittable within a half frame may be 1 or 2.

According to an embodiment of the present disclosure, the Lmax value may be determined based on a bandwidth of a frequency band and/or a carrier. For example, when the bandwidth of a carrier is smaller than a preset threshold (eg, smaller than 5 MHz, smaller than 4 MHz, etc.), 1 or 2 may be used as the Lmax value. In addition, when the frequency band is a preset band (eg, band 8 or a band using a bandwidth less than the preset bandwidth), 1 or 2 may be used as the Lmax value.

The base station and/or the terminal may determine and use an Lmax value suitable for the subcarrier interval in the same way as above.

Next, a time domain mapping period of the SSB according to various embodiments of the present disclosure will be described.

The terminal of the 5G communication system assumes that SSB transmission has a period of 2 frames (20 msec) in the initial cell selection process and can operate. And, after initial access, the base station may provide the terminal with a period of the SSB transmitted from the serving cell through higher layer signaling (e.g. RRC signaling, MAC CE, etc.). Table 4 below shows information included in the ServingCellConfigCommon IE (Information Element), and the SSB period can be provided to the terminal through the value of ssb-periodicityServingCell included in the ServingCellConfigCommon IE. If the ssb-periodicityServingCell parameter is not included in the IE, the UE can understand/assume the value of ms5 (5msec).

[Table 4]

Similarly, the SSB period may be provided to the UE through the value of ssb-PeriodicityServingCell included in the ServingCellConfigCommonSIB IE. Table 5 shows information included in the ServingCellConfigCommonSIB IE.

[Table 5]

The minimum period value of the SSB that can be set through the ssb-PeriodicityServingCell is 5 msec. If the SSB is transmitted with a period of 5 msec when μ = 7.5 kHz, a problem in that many time resources are allocated to the SSB may occur. (If L _max =4, SSB occupies 4msec)

Therefore, according to an embodiment of the present disclosure, some values (e.g. ms5) as the minimum value of the SSB transmission period set and transmitted by the base station (ServingCellConfigCommon, ServingCellConfigCommonSIB) are when the subcarrier interval used in the SSB is 7.5 kHz or smaller. may not be allowed. That is, when the subcarrier interval of the SSB according to an embodiment of the present disclosure is 7.5 kHz (or a value smaller than 7.5 kHz), the base station selects other values (eg, excluding some of the existing values (eg ms5)) as the transmission period of the SSB. e.g. ms10, ms20, ms40, ms80, ms160) can be set and transmitted. That is, the minimum transmission period of the configurable SSB may be 10 ms or greater. If ssb-periodicityServingCell (or ssb-PeriodicityServingCell) is omitted, the default value may be 10 ms or a value greater than 10 ms.

According to an embodiment of the present disclosure, a UE receiving a ServingCellConfigCommon (or ServingCellConfigCommonSIB) IE in which the ssb-periodicityServingCell (or ssb-PeriodicityServingCell) parameter is missing, when the subcarrier interval used in the SSB is 7.5 kHz or less, SSB The period of can be understood/assumed to be a specific value. The specific value may be determined as a minimum value (e.g. ms10) among remaining values except for some values (e.g. ms5) excluded in the embodiment. For example, the specific value may be set to 10 ms or a value larger than 10 ms.

In addition, when the subcarrier interval used in the SSB is 7.5 kHz or smaller, the SSB transmission period during initial access is longer than 2 frames (e.g. 40 msec, 4 frames) according to an embodiment of the present disclosure. frame), and can operate.

Next, timing related parameters according to various embodiments of the present disclosure are defined. When a subcarrier interval smaller than 15 kHz is used according to various embodiments of the present disclosure, it may be necessary to change timing-related parameters to support this.

In the 5G communication system, the time required for processing each of the various channels is defined. The time required for the processing is defined for each channel by the capability of the terminal and numerology (subcarrier spacing μ).

The time required for PUSCH (Physical Uplink Shared Channel) preparation (N ₂ ) is shown in Table 6 (Table 1 PUSCH preparation time for PUSCH timing capability 1) and Table 7 (Table 2 PUSCH preparation time for PUSCH timing) below. capability 2), it may be defined for each capability and numerology (subcarrier spacing μ) of the terminal.

[Table 6]

[Table 7]

Although not shown in Tables 6 and 7 above, when a subcarrier spacing smaller than 15 kHz is used as the subcarrier spacing, the additional N ₂ value may be used as a value smaller than or equal to the preset value, for example, 15 If kHz is used, values less than or equal to may be used. According to an embodiment of the present disclosure, when μ =7.5kHz (μ = -1), the PUSCH preparation time (N ₂ ) for PUSCH timing capability 1 is a value included in [N _2,min,cap1 , 10] one of, one of the values contained in [N _2,min,cap1 , 10), one of the values contained in (N _2,min,cap1 , 10], or (N _2,min,cap1 , 10 ) In addition, according to an embodiment of the present disclosure, when μ =7.5kHz (μ = -1), the PUSCH preparation time (N ₂ ) for PUSCH timing capability 2 is One of the values contained in [N _2,min,cap2 , 5], one of the values contained in [N _2,min,cap2 , 5), the value contained in (N _2,min,cap2 , 5] It may be determined as one of the values included in, or (N _2,min,cap2 , 5).

The terminal and/or the base station may process the PUSCH using the PUSCH preparation time determined as described above.

The time (N ₁ ) required for the processing procedure of PDSCH (Physical Downlink Shared Channel) is Table 8 (PDSCH processing time for PDSCH processing capability 1) and Table 9 (PDSCH processing time for PDSCH processing capability 2) ), it is defined for each capability and numerology (subcarrier spacing μ) of the terminal.

[Table 8]

[Table 9]

Although not shown in Tables 8 and 9 above, when a subcarrier spacing smaller than 15 kHz is used as the subcarrier spacing, the additional N ₁ value may be used as a value smaller than or equal to the preset value, for example, 15 If kHz is used, values less than or equal to may be used. According to an embodiment of the present disclosure, when μ =7.5kHz (μ = -1), PDSCH processing time (N ₁ ) for PDSCH processing capability 1 is a value included in [N _1,min,cap1 , 8] one of, one of the values contained in [N _1,min,cap1 , 8), one of the values contained in (N _1,min,cap1 , 8], or (N _1,min,cap1 , 8 According to an embodiment of the present disclosure, when μ =7.5kHz (μ = -1), the PDSCH processing time (N ₁ ) for PDSCH processing capability 2 is [N One of the values contained in _1,min,cap2 , 3], one of the values contained in [N _1,min,cap2 , 3), one of the values contained in (N _1,min,cap2 , 3] , or one of the values included in (N _1,min,cap2 , 3).

The terminal and/or the base station may process the PDCCH using the PDCCH processing time determined as above.

Preparation for PDSCH reception when PDCCH (Physical Downlink Control Channel) and PDSCH have different numerologies (subcarrier spacing μ) and the carrier on which PDCCH is transmitted differs from the carrier on which PDSCH is transmitted (ie, cross-carrier scheduling) (reception preparation) time (N _pdsch ) is defined for each numerology (subcarrier spacing μ) as shown in Table 10 (N _pdsch as a function of the subcarrier spacing of the scheduling PDCCH).

[Table 10]

Although not shown in Table 10, when a subcarrier spacing smaller than 15 kHz is used as the subcarrier spacing, the additional N _PDSCH value may be used as a value smaller than or equal to the preset value, for example, 15 kHz is used In this case, a value less than or equal to may be used. According to an embodiment of the present disclosure, a physical downlink control channel (PDCCH) and a PDSCH have different numerologies (numerology, subcarrier spacing μ = 7.5 kHz, μ = -1), and the carrier on which the PDCCH is transmitted and the PDSCH are transmitted. When the carriers used are different (ie, cross-carrier scheduling), the PDSCH reception preparation time (N _pdsch ) is one of the values included in [N _pdsch,min , 4], [N _pdsch,min , 4 ), one of the values included in (N _pdsch,min , 4], or one of the values included in (N _pdsch,min , 4).

As such, according to various embodiments of the present disclosure, as a new subcarrier interval is used (eg, μ =7.5kHz (μ = -1)), parameters related to timing (N ₂ , N ₁ , N _pdsch ) may be newly defined, and the newly defined values may be less than or equal to each of the corresponding values (N ₂ , N ₁ , N _pdsch ) when the subcarrier spacing is 15 kHz (μ = 0), and a specific value ( A particular value can have a value of a rational number greater than zero).

Also, according to various embodiments of the present disclosure, new values may be defined for various parameters defined in Table 11 according to the use of a new subcarrier interval. (Explained based on 7.5 kHz, but not limited thereto)

[Table 11]

14 is a diagram illustrating an operation of a terminal according to various embodiments of the present disclosure.

In operation 1410, the terminal can check whether the band it wants to access is a preset band or whether the size of the frequency band it wants to access is smaller than the preset bandwidth. For example, the terminal may check whether the preset band is a specific band (eg, band 8) using a small bandwidth or whether a preset bandwidth (eg, a bandwidth smaller than 5 MHz) is used. Alternatively, if the terminal is set to access only a preset band according to the terminal settings or the type of terminal, or if the terminal is set to use a bandwidth smaller than the preset bandwidth, it can be determined that the condition of operation 1410 is satisfied. .

When it is determined in operation 1410 that a preset band or a bandwidth smaller than the preset bandwidth is used, in operation 1420, the terminal may determine that an SCS smaller than the preset SCS should be used in the corresponding band. For example, the preset SCS may be 15 kHz, and the SCS smaller than 15 kHz may be 7.5 kHz, 3.75 kHz, and the like.

In operation 1430, the UE may obtain or detect the SSB assuming that the SSB transmitted by the base station is generated and transmitted considering an SCS smaller than the preset SCS. For a specific configuration of the SSB, refer to the configuration of the SSB according to various embodiments of the present invention. In addition, the terminal can receive and identify resources for CORESET#0 using a smaller SCS than the preset SCS.

In operation 1440, the terminal may perform communication with the base station. The terminal can control transmission and reception of the data channel by applying a processing time considering the SCS of the frequency band operated by the terminal. For specific examples of processing time, refer to the configuration of processing time according to various embodiments of the present invention.

15 is a diagram illustrating an operation of a base station according to various embodiments of the present disclosure.

In operation 1510, the base station may check whether the band to be operated is a preset band or whether the size of the frequency band to be operated is smaller than the preset bandwidth. For example, the base station may check whether the preset band is a specific band (eg, band 8) using a small bandwidth or whether a preset bandwidth (eg, a bandwidth smaller than 5 MHz) is used.

If it is determined in operation 1510 that a preset band or a bandwidth smaller than the preset bandwidth is used, in operation 1520, the base station may determine that an SCS smaller than the preset SCS should be used in the corresponding band. For example, the preset SCS may be 15 kHz, and the SCS smaller than 15 kHz may be 7.5 kHz, 3.75 kHz, and the like.

In operation 1530, the base station may generate and transmit an SSB. The base station may generate or configure an SSB for an SCS smaller than a preset SCS. For a specific configuration of the SSB, refer to the configuration of the SSB according to various embodiments of the present invention. In addition, the base station may set the setting for CORESET#0 using an SCS smaller than the preset SCS.

In operation 1540, the base station may communicate with at least one terminal. The base station can control transmission and reception of the data channel by applying a processing time considering the SCS of the frequency band operated by the base station. For specific examples of processing time, refer to the configuration of processing time according to various embodiments of the present invention.

According to an embodiment of the present disclosure, in the case of a specific frequency band and/or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less), only a subcarrier spacing (SCS) of 15 kHz is used for the SSB. use may be permitted. Since PSS and SSS of SSB have 15 kHz * 12 * 12 = 2.16 MHz and PBCH has 15 kHz * 12 * 20 = 3.6 MHz, at least some resources used for PBCH may be punctured. For example, resources belonging to at least three or more RBs may be punctured.

According to an embodiment of the present disclosure, in the case of a specific frequency band and/or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less), only a subcarrier spacing (SCS) of 15 kHz SSB and It may be allowed to use the PDCCH transmitted through CORESET#0. Since CORESET#0 has 24 RBs, 48 RBs, or 96 RBs, corresponding to 4.32 MHz, 8.64 MHz, and 17.28 MHz, respectively, at least some resources used in CORESET #0 may be punctured. Since CORESET has 6 RBs as a basic resource unit, resources belonging to 6*M (M is a natural number) RBs can be punctured accordingly. An indication of whether to perform puncturing may be broadcast and delivered to the terminal.

According to an embodiment of the present disclosure, a base station operating in a specific frequency band and/or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less) uses some resources of the PBCH and/or CORESET# Some resources of 0 may be punctured and transmitted.

According to an embodiment of the present disclosure, a terminal operating in a specific frequency band and/or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less) uses some resources of the PBCH and/or CORESET# It can understand that some resource of 0 is punctured and process the signal.

According to an embodiment of the present disclosure, transmission of DMRS of PSS, SSS, PBCH, and PBCH in a specific frequency band and / or specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less) The resources used may be as shown in Table 12. In Table 12, resources belonging to [0, k _puncture,1 -1] and resources belonging to [k _pucture,2, 239] are punctured, and resources belonging to [k _puncture,1 , k _pucture,2 -1] Resources may not be punctured. The value of k _puncture,1 may correspond to one of the natural numbers of [24, 55], and the value of k _puncture,2 may correspond to one of the natural numbers of [183, 216]. The value of k _puncture,1 may correspond to one of the natural numbers of [30, 55], and the value of k _puncture,2 may correspond to one of the natural numbers of [183, 210]. The value of k _puncture,1 may correspond to one of the natural numbers of [36, 55], and the value of k _puncture,2 may correspond to one of the natural numbers of [183, 204]. The amount of resources belonging to [0, k _puncture,1 -1] and resources belonging to [k _pucture,2, 239] may be the same or different.

[Table 12]

According to an embodiment of the present disclosure, in the case of a specific frequency band and/or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less), only a subcarrier spacing (SCS) of 15 kHz is used for the SSB. use may be permitted. PSS and SSS of SSB may have 15 kHz * 12 * 12 = 2.16 MHz. The number of RBs allocated to the PBCH may be X (eg, 17, 16, 15, 14, 13, or 12), and the PBCH may be transmitted by being mapped to RB resources allocated for the PBCH. Accordingly, the PBCH may have a bandwidth of 15 kHz * 12 * X (12 to 17) = 2.16 MHz to 3.06 MHz.

According to an embodiment of the present disclosure, in the case of a specific frequency band and/or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less), a part of the PBCH is mapped even in a symbol in which the PSS is transmitted and can be transmitted. In this case, several REs between the PBCH and the PSS may be set to 0. (That is, none may be mapped.)

According to an embodiment of the present disclosure, a base station operating in a specific frequency band and / or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less) allocates X (<20 It can be transmitted using resources corresponding to ) number of RBs.

According to an embodiment of the present disclosure, a terminal operating in a specific frequency band and/or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less) has X (<20) assigned to the PBCH Signals may be received and processed from the number of RBs.

According to an embodiment of the present disclosure, the MIB transmitted through the PBCH includes SystemFrameNumber (6 bits, indicating 6 MSB out of 10 bits of the System Frame Number), subCarrierSpacingCommon (1 bit, SIB1, MSG 2/4, paging, broadcast SIB indicates the sub carrier spacing for), ssb-SubcarrierOffset (4 bits, corresponding to kSSB, which indicates the offset between the SSB and the overall resource block grid as the number of subcarriers), dmrs-TypeA-Position (1 bit, indicating the location of downlink and uplink DMRS), pdcch-ConfigSIB1 (8 bits, indicating CORESET#0 and SearchSpace#0 settings), cellBarred (1 bit, indicating whether camping to the cell is allowed) .

According to an embodiment of the present disclosure, a new CORESET#0 setting may be indicated using at least one of unused indexes (Reserved) among indexes (0 to 15) indicating the setting of CORESET#0. .

According to an embodiment of the present disclosure, CORESET#0 for a specific frequency band and/or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less) is in at least some of the following combinations may apply. CORESET#0 may have 12 RBs (N _RB ^CORESET ) and 4 symbols (N _symb ^CORESET ). CORESET#0 may have 12 RBs (N _RB ^CORESET ) and 6 symbols (N _symb ^CORESET ). CORESET#0 may have 18 RBs (N _RB ^CORESET ) and 3 symbols (N _symb ^CORESET ). CORESET#0 may have 18 RBs (N _RB ^CORESET ) and 4 symbols (N _symb ^CORESET ).

According to an embodiment of the present disclosure, if there is one combination included in CORESET#0 for a specific frequency band and/or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less), The corresponding combination may be indicated using one of unused indexes (Reserved) among indexes (0 to 15) indicating the setting of CORESET#0. In this case, index 15 of CORESET#0 included in pdcch-ConfigSIB1 included in the MIB can be used. Table 13 shows this.

[Table 13]

According to an embodiment of the present disclosure, when there are two or more combinations included in CORESET#0 for a specific frequency band and/or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less) , a new table pointing to the combination may be defined. Table 14 shows this. 1 bit of Spare (reserved bit) in the MIB may be used to indicate whether the new table (e.g. Table 14) or the existing table is indicated. If the 1-bit value is 0, the existing table 1 may be a new table (e.g. Table 14) or vice versa.

[Table 14]

According to an embodiment of the present disclosure, pdcch-ConfigSIB1 included in the MIB transmitted on the PBCH for a specific frequency band and/or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less) is It may consist of N bits smaller than 8 bits.

According to an embodiment of the present disclosure, a MIB transmitted on a PBCH for a specific frequency band and/or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less) may not include a subCarrierSpacingCommon parameter. can

According to an embodiment of the present disclosure, the MIB transmitted on the PBCH for a specific frequency band and/or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less) is different from the existing MIB. It may include an indicator (1 bit) indicating whether it is a MIB or a newly defined MIB.

According to an embodiment of the present disclosure, the MIB transmitted on the PBCH for a specific frequency band and/or a specific frequency bandwidth (eg, a band for supporting a bandwidth of 5 MHz or less) is SystemFrameNumber (6 bits, System Indicates 6 MSB out of 10 bits of Frame Number), subCarrierSpacingCommon (1 bit, SIB1, MSG 2/4, paging, indicates subcarrier spacing for broadcasted SIB), ssb-SubcarrierOffset (4 bits, corresponding to kSSB, which is equivalent to SSB and offset between the overall resource block grid (indicates the number of subcarriers), dmrs-TypeA-Position (1 bit, indicating the position of downlink and uplink DMRS), pdcch-ConfigSIB1 (8 bits, CORESET Indicates setting #0 and SearchSpace#0), cellBarred (1 bit, indicates whether camping to the corresponding cell is allowed), intraFreqReselection (1 bit, whether or not another cell of the same frequency band can be selected in the cell reselection operation of the terminal) indication) and spare (1 bit, unused).

According to an embodiment of the present disclosure, the number N _RB of RBs constituting a carrier may be determined by spectrum utilization and subcarrier spacing.

When subcarrier spacing of 7.5 kHz is used in a 3 MHz bandwidth, the number of N _RBs included in the carrier is 26 (spectrum utilization: 80%), 30 (spectrum utilization: 90%), or 31 (spectrum utilization: 95 %).

When subcarrier spacing of 15 kHz is used in a 3 MHz bandwidth, the number of N _RBs included in the carrier is 13 (spectrum utilization: 80%), 15 (spectrum utilization: 90%), or 15 (spectrum utilization: 95%) dog) can be

When subcarrier spacing of 7.5 kHz is used in a 4 MHz bandwidth, the number of N _RBs included in the carrier is 35 (spectrum utilization: 80%), 40 (spectrum utilization: 90%), or 42 (spectrum utilization: 95 %).

When subcarrier spacing of 15 kHz is used in a 4 MHz bandwidth, the number of N _RBs included in the carrier is 17 (spectrum utilization: 80%), 20 (spectrum utilization: 90%), or 21 (spectrum utilization: 95%) dog) can be

16 is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure.

Referring to FIG. 16 , a terminal may include a transmission/reception unit 1610, a control unit 1620, and a storage unit 1630. In the present invention, the controller 1620 may be defined as a circuit or an application-specific integrated circuit or at least one processor.

The transmitting/receiving unit 1610 may transmit/receive signals with other network entities. The transmission/reception unit 1610 may perform signal transmission/reception of the terminal of the present disclosure described above.

The control unit 1620 may control overall operations of a terminal according to an embodiment proposed in the present disclosure. The control unit 1620 may obtain synchronization through the SSB according to various embodiments of the present disclosure, process parameters set based on the subcarrier interval, and control transmission and reception of the PUSCH and PDSCH using processing time.

In addition, the control unit 1620 identifies whether the frequency band to which the terminal accesses uses a bandwidth smaller than a preset bandwidth, and if a bandwidth smaller than the preset bandwidth is used, a preset subcarrier spacing (SCS) An SCS having a smaller size may be determined, and a synchronization signal block (SSB) may be acquired using the determined SCS. In addition, a control resource set0 (CORESET) for a system information block (SIB1) may be identified based on a master information block (MIB) of the SSB, and the CORESET may be identified based on the determined SCS. In addition, a symbol to which a primary synchronization signal (PSS) of the SSB is mapped, a symbol to which a secondary synchronization signal (SSS) is mapped, and a symbol to which a physical broadcast channel (PBCH) is mapped may be discontinuously located. Also, when the SCS smaller than 15 kHz is used, the maximum number of SSBs mappable to a half frame may be 1 or 2. Also, when the SCS smaller than 15 kHz is used, the minimum transmission period of the SSB may be 10 ms or more.

The storage unit 1630 may store at least one of information transmitted and received through the transmission and reception unit 1610 and information generated through the control unit 1620 .

17 is a diagram illustrating the structure of a base station according to an embodiment of the present disclosure.

Referring to FIG. 17 , a base station may include a transceiver 1710, a control unit 1720, and a storage unit 1730. In the present invention, the control unit 1720 may be defined as a circuit or an application-specific integrated circuit or at least one processor.

The transmitting/receiving unit 1710 may transmit/receive signals with other network entities.

The controller 1720 may control overall operations of the base station according to the embodiment proposed in the present disclosure. The control unit 1720 may configure SSBs according to various embodiments of the present disclosure, process parameters set based on subcarrier intervals, and control transmission and reception of PUSCH and PDSCH using processing time.

In addition, the control unit 1720 identifies whether the frequency band operated by the base station uses a bandwidth smaller than a preset bandwidth, and if a bandwidth smaller than the preset bandwidth is used, a preset subcarrier spacing (SCS) An SCS having a smaller size may be determined, a synchronization signal block (SSB) may be generated using the determined SCS, and the SSB may be controlled to be transmitted. In addition, a control resource set0 (CORESET) for a system information block (SIB1) may be identified based on a master information block (MIB) of the SSB, and the CORESET may be identified based on the determined SCS. In addition, a symbol to which a primary synchronization signal (PSS) of the SSB is mapped, a symbol to which a secondary synchronization signal (SSS) is mapped, and a symbol to which a physical broadcast channel (PBCH) is mapped may be discontinuously located. Also, when the SCS smaller than 15 kHz is used, the maximum number of SSBs mappable to a half frame may be 1 or 2. Also, when the SCS smaller than 15 kHz is used, the minimum transmission period of the SSB may be 10 ms or more.

The storage unit 1730 may store at least one of information transmitted and received through the transmission and reception unit 1710 and information generated through the control unit 1720 .

Methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented in software, a computer readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium are configured for execution by one or more processors in an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

Such programs (software modules, software) may include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM. (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other forms of It can be stored on optical storage devices, magnetic cassettes. Alternatively, it may be stored in a memory composed of a combination of some or all of these. In addition, each configuration memory may include a plurality.

In addition, the program accesses through a communication network such as the Internet, an Intranet, a Local Area Network (LAN), a Wide LAN (WLAN), or a Storage Area Network (SAN), or a communication network composed of a combination thereof. It can be stored on an attachable storage device that can be accessed. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.

In the specific embodiments of the present disclosure described above, constituent elements included in the present disclosure are expressed in singular or plural numbers according to the specific embodiments presented. However, the singular or plural expressions are selected appropriately for the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components, and even components expressed in plural are composed of the singular number or singular. Even the expressed components may be composed of a plurality.

On the other hand, the embodiments of the present disclosure disclosed in the present specification and drawings are only presented as specific examples to easily explain the technical content of the present disclosure and help understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other modifications based on the technical idea of the present disclosure are possible. In addition, each of the above embodiments can be operated in combination with each other as needed. For example, a base station and a terminal may be operated by combining parts of one embodiment of the present disclosure and another embodiment. In addition, the embodiments of the present disclosure can be applied to other communication systems, and other modifications based on the technical ideas of the embodiments may also be implemented.

Claims (20)

In a method performed by a base station of a wireless communication system,
identifying whether the frequency band operated by the base station uses a bandwidth smaller than a preset bandwidth;
determining an SCS smaller than a preset subcarrier spacing (SCS) when using a bandwidth smaller than the preset bandwidth;
generating a synchronization signal block (SSB) using the determined SCS; and
Transmitting the SSB;
Wherein the determined SCS is less than 15 kHz. According to claim 1,
A control resource set0 (CORESET) for a system information block (SIB1) is identified based on a master information block (MIB) of the SSB,
Wherein the CORESET is identified based on the determined SCS. According to claim 1,
A method characterized in that a symbol to which a primary synchronization signal (PSS) of the SSB is mapped, a symbol to which a secondary synchronization signal (SSS) is mapped, and a symbol to which a physical broadcast channel (PBCH) is mapped are discontinuously located. According to claim 1,
When the SCS smaller than 15 kHz is used, the maximum number of SSBs mappable to a half frame is 1 or 2. According to claim 1,
When the SCS smaller than 15 kHz is used, the minimum transmission period of the SSB is 10 ms or more. In the method performed by the terminal of the wireless communication system,
identifying whether a frequency band accessed by the terminal uses a bandwidth smaller than a preset bandwidth;
determining an SCS smaller than a preset subcarrier spacing (SCS) when using a bandwidth smaller than the preset bandwidth; and
Acquiring a synchronization signal block (SSB) using the determined SCS,
Wherein the determined SCS is less than 15 kHz. According to claim 6,
A control resource set0 (CORESET) for a system information block (SIB1) is identified based on a master information block (MIB) of the SSB,
Wherein the CORESET is identified based on the determined SCS. According to claim 6,
A method characterized in that a symbol to which a primary synchronization signal (PSS) of the SSB is mapped, a symbol to which a secondary synchronization signal (SSS) is mapped, and a symbol to which a physical broadcast channel (PBCH) is mapped are discontinuously located. According to claim 6,
When the SCS smaller than 15 kHz is used, the maximum number of SSBs mappable to a half frame is 1 or 2. According to claim 6,
When the SCS smaller than 15 kHz is used, the minimum transmission period of the SSB is 10 ms or more. In a base station of a wireless communication system,
transceiver; and
Identifying whether the frequency band operated by the base station uses a bandwidth smaller than a preset bandwidth, and determining a SCS smaller than a preset subcarrier spacing (SCS) when using a bandwidth smaller than the preset bandwidth, , a control unit for generating a synchronization signal block (SSB) using the determined SCS and controlling transmission of the SSB, wherein the determined SCS is smaller than 15 kHz. According to claim 11,
A control resource set0 (CORESET) for a system information block (SIB1) is identified based on a master information block (MIB) of the SSB,
The base station, characterized in that the CORESET is identified based on the determined SCS. According to claim 11,
A base station characterized in that the symbol to which the primary synchronization signal (PSS) of the SSB is mapped, the symbol to which the secondary synchronization signal (SSS) is mapped, and the symbol to which the physical broadcast channel (PBCH) is mapped are discontinuously located. According to claim 11,
When the SCS smaller than 15 kHz is used, the maximum number of SSBs mappable to a half frame is 1 or 2. According to claim 11,
When the SCS smaller than 15 kHz is used, the base station characterized in that the minimum transmission period of the SSB is 10 ms or more. In the terminal of the wireless communication system,
transceiver; and
Identify whether the frequency band accessed by the terminal uses a bandwidth smaller than the preset bandwidth, and when using a bandwidth smaller than the preset bandwidth, determine an SCS smaller than the preset SCS (subcarrier spacing), , A control unit for controlling to obtain a synchronization signal block (SSB) using the determined SCS,
The determined SCS is less than 15 kHz. According to claim 16,
A control resource set0 (CORESET) for a system information block (SIB1) is identified based on a master information block (MIB) of the SSB,
The CORESET is characterized in that it is identified based on the determined SCS. According to claim 16,
The terminal characterized in that the symbol to which the primary synchronization signal (PSS) of the SSB is mapped, the symbol to which the secondary synchronization signal (SSS) is mapped, and the symbol to which the physical broadcast channel (PBCH) is mapped are discontinuously located. According to claim 16,
When the SCS smaller than 15 kHz is used, the maximum number of SSBs mappable to a half frame is 1 or 2. According to claim 16,
When the SCS smaller than 15 kHz is used, the minimum transmission period of the SSB is 10 ms or more.

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