Method for transmitting and receiving SS / PBCH and apparatus therefor

Abstract

A method performed by means of a terminal according to an embodiment of the present disclosure comprises the steps of: receiving an SS / PBCH block; and receiving configuration information including information related to the point A. A frequency offset between i) the point A and ii) the lowest subcarrier of the lowest resource block that overlaps the SS / PBCH block is determined based on the information related to the point A. The lowest subcarrier of the lowest resource block overlaps the SS / PBCH block after puncturing.

Description

Technical Field

[0001] This disclosure relates to a method and apparatus for transmitting and receiving SS / PBCH. Background Technology

[0002] Mobile communication systems have evolved to provide voice services while ensuring user activity. However, mobile communication systems have expanded not only to voice services but also to data services. Currently, due to resource shortages caused by the explosive growth of data traffic, users require faster services. Therefore, more advanced mobile communication systems are needed.

[0003] The requirements for next-generation mobile communication systems should include the ability to support explosive data traffic, significantly increased data rates per user, a substantial increase in the number of connected devices, extremely low end-to-end latency, and high energy efficiency. To this end, various technologies have been investigated, including dual connectivity, massive MIMO, in-band full-duplex, non-orthogonal multiple access (NOMA), ultra-wideband support, and device networking.

[0004] To effectively support various use cases in 5G in terms of cost / complexity, the maximum bandwidth of newly introduced UE types can be reduced. For example, the maximum bandwidth can be reduced to 3 MHz.

[0005] If the maximum bandwidth is reduced (e.g., 3MHz), the UE will not be able to receive the entire SSB. To prevent this, the SSB can be transmitted within the punctured resource area. Point A, which serves as a common reference point for the resource block grid, can be obtained based on the lowest subcarrier of the lowest resource block overlapping with the SSB. Summary of the Invention

[0006] Technical issues

[0007] If puncturing is performed as described above, it may be unclear how point A should be determined / obtained. Specifically, it may be unclear whether point A is defined based on the resource block / subcarrier overlapping with the SSB before puncturing or based on the resource block / subcarrier overlapping with the SSB after puncturing.

[0008] The purpose of this disclosure is to propose a method for solving the above-mentioned problems.

[0009] The technical objectives to be achieved in this disclosure are not limited to those described above, and other technical objectives not described above can be clearly understood by those skilled in the art from the following description.

[0010] Technical solution

[0011] A method performed by a user equipment (UE) according to an embodiment of the present disclosure includes receiving a synchronization signal / physical broadcast channel (SS / PBCH) block and receiving configuration information including information related to point A.

[0012] Based on the information related to point A, determine i) the frequency offset between point A and ii) the lowest subcarrier of the lowest resource block that overlaps with the SS / PBCH block.

[0013] The time-frequency structure associated with the SS / PBCH block is based on puncturing. The lowest subcarrier of the lowest resource block overlaps with the punctured SS / PBCH block.

[0014] A punched SS / PBCH block can include 12 or 15 resource blocks.

[0015] The 12 resource blocks can be the remaining blocks from the four orthogonal frequency division multiplexing (OFDM) symbols based on subcarrier numbers 0 to 239, excluding the subcarrier numbers 0 to 47 and 192 to 239.

[0016] The channel bandwidth associated with cell search based on SS / PBCH blocks can be less than 5MHz.

[0017] A resource block can be defined as 12 consecutive subcarriers in the frequency domain. The common reference point of the resource block grid can be based on point A.

[0018] The punched SS / PBCH block can be used by the UE for initial cell selection.

[0019] Common resource blocks (CRBs) can be numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of CRB 0 can coincide with point A.

[0020] The lowest resource block can be a CRB that overlaps with the subcarrier 0 of the lowest resource block of the punctured SS / PBCH block.

[0021] Physical resource blocks (PRBs) can be defined within the bandwidth portion (BWP) of a subset based on CRBs.

[0022] The CRB number associated with the PRB number can be determined based on i) the PRB number and ii) the sum of the CRB numbers of the BWP starting with CRB 0.

[0023] The method may also include receiving information related to SS / PBCH blocks.

[0024] Information related to SS / PBCH blocks can be received based on broadcast signaling.

[0025] Information related to SS / PBCH blocks may include information about at least one of the following: i) the number of resource blocks associated with the punched SS / PBCH block and / or ii) the location of the resource blocks.

[0026] Before receiving information related to SS / PBCH blocks, the number of resource blocks associated with the punched SS / PBCH blocks can be determined based on the default configuration.

[0027] A user equipment (UE) according to another embodiment of the present disclosure includes one or more transceivers, one or more processors, and one or more memories connected to the one or more processors and configured to store instructions.

[0028] The instructions are based on the one or more processors being executed to configure the one or more processors to perform all the steps of the method according to any one of claims 1 to 13.

[0029] An apparatus according to another embodiment of the present disclosure includes one or more memories and one or more processors operatively connected to one or more memories.

[0030] The one or more memories are configured to store instructions based on instructions executed by the one or more processors, and the instructions are configured to allow the one or more processors to perform all steps of any of the methods.

[0031] One or more non-transitory computer-readable media storage instructions according to another embodiment of this disclosure. The instructions, executable by one or more processors, are configured to allow one or more processors to perform all steps of any of the methods.

[0032] According to another embodiment of this disclosure, a method performed by a base station includes transmitting a synchronization signal / physical broadcast channel (SS / PBCH) block and transmitting configuration information including information related to point A.

[0033] Based on the information related to point A, determine i) the frequency offset between point A and ii) the lowest subcarrier of the lowest resource block that overlaps with the SS / PBCH block.

[0034] The time-frequency structure associated with the SS / PBCH block is based on puncturing. The lowest subcarrier of the lowest resource block overlaps with the punctured SS / PBCH block.

[0035] A base station operating in wireless communication according to another embodiment of the present disclosure includes: one or more transceivers; one or more processors; and one or more memories connected to one or more processors and configured to store instructions.

[0036] The instructions are configured to allow the one or more processors to perform all steps of any of the methods, based on execution by the one or more processors.

[0037] Beneficial effects

[0038] According to embodiments of this disclosure, point A is defined as a common reference point for the resource block grid based on the punctured SS / PBCH block. Therefore, uncertainties related to the criteria for identifying frequency resources used by UEs supporting channel bandwidths less than 5 MHz can be resolved.

[0039] Furthermore, it prevents the use of different standards (difference A) to determine the location of frequency resources in the channel bandwidth based on punctured SS / PBCH block transmission. Therefore, the reliability of frequency resource allocation and signaling based on the allocated frequency resources can be ensured.

[0040] Furthermore, the embodiments of this disclosure can help expand the application use cases of NR systems by addressing problems that may arise when supporting narrowband UE / spectrum scenarios.

[0041] The effects that can be obtained from this disclosure are not limited to the effects described above, and other effects not mentioned can be clearly understood by those skilled in the art to which this disclosure pertains from the following description. Attached Figure Description

[0042] Figure 1 An example of a frame structure in an NR system is shown.

[0043] Figure 2 An example of a resource grid in NR is shown.

[0044] Figure 3 The physical channels and general signal transmissions used in the 3GPP system are shown.

[0045] Figure 4 This is a diagram illustrating the SSB structure to which the method proposed in this disclosure applies.

[0046] Figure 5 An SSB transmission using the method proposed in this disclosure is illustrated.

[0047] Figure 6 This is a flowchart illustrating the reception of DL signals / channels during the initial access process to which the method according to embodiments of this disclosure is applicable.

[0048] Figure 7 An example of the time-frequency structure of an SSB according to an embodiment of the present disclosure is shown.

[0049] Figure 8An example of a frequency resource domain for PBCH transmission / reception according to an embodiment of the present disclosure is shown.

[0050] Figure 9 An example of a frequency resource domain for PBCH transmission / reception according to another embodiment of this disclosure is shown.

[0051] Figure 10 An example of an application method for a frequency resource domain for PBCH transmission / reception according to an embodiment of the present disclosure is shown.

[0052] Figure 11 An example of an application method for a frequency resource domain for PBCH transmission / reception according to another embodiment of this disclosure is shown.

[0053] Figure 12 Point A is shown according to the existing method.

[0054] Figure 13 Point A is shown according to an embodiment of this disclosure.

[0055] Figure 14 This is a flowchart illustrating a method performed by a user equipment according to an embodiment of the present disclosure.

[0056] Figure 15 This is a flowchart illustrating a method performed by a base station according to another embodiment of the present disclosure.

[0057] Figure 16 The configurations of the first and second devices according to embodiments of the present disclosure are shown. Detailed Implementation

[0058] In the following text, downlink (DL) refers to communication from a base station to a terminal, and uplink (UL) refers to communication from a terminal to a base station. In the downlink, the sender can be part of the base station, and the receiver can be part of the terminal. In the uplink, the sender can be part of the terminal, and the receiver can be part of the base station. A base station can be referred to as a first communication device, and a terminal can be referred to as a second communication device. The term base station (BS) can be replaced by terms including fixed station, Node B, evolved Node B (eNB), next-generation Node B (gNB), base transceiver system (BTS), access point (AP), network (5G network), AI system, roadside unit (RSU), vehicle, robot, unmanned aerial vehicle (UAV), augmented reality (AR) device, virtual reality (VR) device, etc. Furthermore, the terminal can be fixed or mobile, and can be replaced by terms including user equipment (UE), mobile station (MS), user terminal (UT), mobile subscriber station (MSS), subscriber station (SS), advanced mobile station (AMS), wireless terminal (WT), machine-type communication (MTC) device, machine-to-machine (M2M) device and device-to-device (D2D) device, vehicle, robot, AI module, unmanned aerial vehicle (UAV), augmented reality (AR) device, virtual reality (VR) device, etc.

[0059] The following technologies can be used in various radio access systems, including CDMA, FDMA, TDMA, OFDMA, SC-FDMA, etc. CDMA can be implemented as radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented as radio technologies such as Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), and Enhanced Data Rate for GSM Evolution (EDGE). OFDMA can be implemented as radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA, and LTE-Advanced (A) / LTE-A pro are evolved versions of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolution of 3GPP LTE / LTE-A / LTE-Apro.

[0060] For clarity, the technical spirit of this disclosure is described based on 3GPP communication systems (e.g., LTE-A or NR), but is not limited thereto. LTE refers to technology after 3GPP TS 36.xxx version 8. Specifically, LTE technology after 3GPP TS 36.xxx version 10 is called LTE-A, and LTE technology after 3GPP TS 36.xxx version 13 is called LTE-A pro. 3GPP NR refers to technology after TS 38.xxx version 15. LTE / NR can be referred to as a 3GPP system. "xxx" refers to a detailed standard document number. LTE / NR can be collectively referred to as a 3GPP system.

[0061] Background information, terminology, omissions, etc., used in describing this disclosure may be referenced to the content disclosed in previously published standard documents. For example, the following documents may be consulted.

[0062] 3GPP NR

[0063] - 3GPP TS 38.211: Physical Channels and Modulation

[0064] - 3GPP TS 38.212: Multiplexing and Channel Coding

[0065] - 3GPP TS 38.213: Physical layer procedures for control

[0066] - 3GPP TS 38.214: Physical Layer Procedures for Data

[0067] - 3GPP TS 38.215: Physical Layer Measurements

[0068] - 3GPP TS 38.300: General Description of NR and NG-RAN

[0069] - 3GPP TS 38.304: User Equipment (UE) Procedures in Idle Mode and RRC Inactive State

[0070] - 3GPP TS 38.321: Media Access Control (MAC) Protocol

[0071] - 3GPP TS 38.322: Radio Link Control (RLC) Protocol

[0072] - 3GPP TS 38.323: Packet Data Convergence Protocol (PDCP)

[0073] - 3GPP TS 38.331: Radio Resource Control (RRC) Protocol

[0074] - 3GPP TS 37.324: Service Data Adaptation Protocol (SDAP)

[0075] - 3GPP TS 37.340: Multiple Connectivity; General Description

[0076] - 3GPP TS 23.287: Application layer support for V2X services; functional architecture and information flow

[0077] - 3GPP TS 23.501: System Architecture for 5G Systems

[0078] - 3GPP TS 23.502: Process for 5G Systems

[0079] - 3GPP TS 23.503: Policy and Charging Control Framework for 5G Systems; Phase 2

[0080] - 3GPP TS 24.501: Non-Access Stratum (NAS) Protocol for 5G Systems (5GS); Phase 3

[0081] - 3GPP TS 24.502: Access to the 3GPP 5G Core Network (5GCN) via a non-3GPP access network

[0082] - 3GPP TS 24.526: User Equipment (UE) Policy for 5G Systems (5GS); Phase 3

[0083] As more and more communication devices require greater communication capacity, there is a need for mobile broadband communication technologies that are improved compared to existing radio access technologies (RATs). Furthermore, massive machine-type communication (MTC), which connects numerous devices and objects and provides various services anytime, anywhere, is one of the main issues to be considered in next-generation communications. In addition, communication system designs considering services / UEs sensitive to reliability and latency are also under discussion. The introduction of next-generation radio access technologies that consider enhanced mobile broadband communication (eMBB), massive MTC (mMTC), and ultra-reliable low-latency communication (URLLC) is discussed, and in this disclosure, for convenience, this technology is referred to as New RAT (NR). NR is an example representation of 5G radio access technology (RAT).

[0084] New RAT systems, including NR, employ OFDM or similar transmission schemes. These new RAT systems can follow different OFDM parameters than LTE. Alternatively, they can retain the traditional LTE / LTE-A parameter sets (numerology) or have a larger system bandwidth (e.g., 100 MHz). Alternatively, a single cell can support multiple parameter sets. In other words, user equipment (UEs) operating with different parameter sets can coexist within a single cell.

[0085] The parameter set corresponds to a subcarrier spacing in the frequency domain. Different parameter sets can be defined by scaling the reference subcarrier spacing to an integer N.

[0086] New RAT (NR) parameter set and frame structure

[0087] In NR systems, multiple parameter sets can be supported. These parameter sets can be defined by subcarrier spacing and cyclic prefix (CP) overhead. The spacing between multiple subcarriers can be derived by scaling the basic subcarrier spacing to an integer N (or µ). Furthermore, although it is assumed that very low subcarrier spacings will not be used at very high subcarrier frequencies, the parameter set to be used can be selected band-independently.

[0088] Furthermore, the NR system can support various frame structures based on multiple parameter sets.

[0089] The following section describes the set of orthogonal frequency division multiplexing (OFDM) parameters and frame structures that can be considered in NR systems.

[0090] Multiple OFDM parameter sets supported in the NR system can be defined as shown in Table 1. The μ and cyclic prefix for the bandwidth portion are obtained from the RRC parameters provided by the base station.

[0091] [Table 1]

[0092]

[0093] NR supports multiple parameter sets (or subcarrier spacing (SCS)) to support a variety of 5G services. For example, when the SCS is 15 kHz, it supports wide areas in traditional cellular bands; and when the SCS is 30 kHz / 60 kHz, it supports dense urban areas, lower latency, and wider carrier bandwidth; and when the SCS is greater than 60 kHz, it supports bandwidths greater than 24.25 GHz to overcome phase noise.

[0094] The NR band is defined as two types of frequency ranges: FR1 and FR2. FR1 can represent the range below 6 GHz, while FR2 can represent the range above 6 GHz, and can also refer to millimeter waves (mmW).

[0095] Table 2 below shows an example of the definition of the NR band.

[0096] [Table 2]

[0097]

[0098] Regarding the frame structure in the NR system, the size of each field in the time domain is represented as a time unit. Multiples of. In this case... And N f =4096. DL and UL transmissions are configured to have The radio frame consists of ten subframes, each with [specific characteristics]. In this case, there can be a set of UL frames and a set of DL frames.

[0099] The uplink frame number i used for transmissions from a user equipment (UE) should be before the start of the corresponding downlink frame for the corresponding UE. start.

[0100] For parameter set µ, within the subframe, according to The time slots are numbered in ascending order and within the radio frame according to... The time slots are numbered in ascending order. A time slot consists of... Composed of consecutive OFDM symbols, and The time slot is determined by the parameter set and time slot configuration used. (Time slot in subframe) The start of OFDM symbols in the same subframe The beginnings are aligned in time.

[0101] Not all UEs can transmit and receive simultaneously, which means that not all OFDM symbols in the downlink or uplink slots are available.

[0102] Table 3 shows the number of OFDM symbols in each time slot during normal CP. Number of time slots per radio frame and the number of time slots in each subframe Table 4 shows the number of OFDM symbols in each time slot, the number of time slots in each radio frame, and the number of time slots in each subframe in the extended CP.

[0103] [Table 3]

[0104]

[0105] [Table 4]

[0106]

[0107] Figure 1 An example of a frame structure in an NR system is shown. Figure 1 This disclosure is for illustrative purposes only and does not limit the scope of this disclosure.

[0108] In Table 4, with µ = 2, as an example, the subcarrier spacing (SCS) is 60 kHz. Referring to Table 3, a subframe (or frame) can include four time slots, and for example, as shown... Figure 1 As shown, a subframe = {1, 2, 4} time slots, and the number of time slots that a subframe can include can be defined as shown in Table 3.

[0109] Furthermore, a mini-slot can consist of 2, 4, or 7 symbols, or it can consist of more or fewer symbols.

[0110] Regarding physical resources in an NR system, one can consider antenna ports, resource grids, resource elements, resource blocks, carrier components, etc.

[0111] The physical resources that can be considered in an NR system are described in detail below.

[0112] Figure 2 An example of a resource grid supported in NR is shown.

[0113] Reference Figure 2 For each subcarrier spacing configuration and carrier, the following is defined: Subcarriers and A resource grid of OFDM symbols, wherein Instructed by RRC signaling from BS. It can be changed between uplink and downlink, or configured with subcarrier spacing. Change.

[0114] For parameter sets in the resource grid Each element of the antenna port p is called a resource element, and is indexed by a pair. Uniquely identified, among which It is an index in the frequency domain, and This refers to the position of the symbol within the subframe. Index pair Used to refer to resource elements in a time slot, where .

[0115] For parameter set and resource elements of antenna port p Corresponding to complex value When there is no risk of confusion or when no specific antenna port or parameter set is specified, index p can be discarded. Therefore, complex values ​​can be or Furthermore, physical resource blocks are defined in the frequency domain. A series of consecutive subcarriers.

[0116] Considering that the UE may not be able to support the wide bandwidth that the NR system needs to support at once, the UE can be configured to operate in a portion of the cell's frequency bandwidth (hereinafter referred to as the Bandwidth Part (BWP)).

[0117] The resource blocks of an NR system include physical resource blocks defined in the bandwidth section, and configurations for subcarrier spacing. Public resource blocks numbered from 0 upwards in the frequency domain.

[0118] Point A is used as a common reference point for the resource block grid and can be obtained as follows.

[0119] - For the PCell downlink, offsetToPointA represents the frequency offset between point A and the lowest subcarrier of the lowest resource block that overlaps with the SS / PBCH block used by the UE for initial cell selection, and is expressed in units of resource blocks. It is assumed that the subcarrier spacing for FR1 is 15 kHz and the subcarrier spacing for FR2 is 60 kHz.

[0120] - absoluteFrequencyPointA represents the frequency location of point A, expressed as the absolute radio frequency channel number (ARFCN);

[0121] configuration of subcarrier spacing In the frequency domain, public resource blocks are numbered starting from 0 and moving upwards.

[0122] configuration of subcarrier spacing The center of subcarrier 0 of common resource block 0 coincides with "point A". Common resource block numbering in the frequency domain. The resource elements (k, l) configured for subcarrier spacing µ can be given by Equation 1 below.

[0123] [Formula 1]

[0124]

[0125] Here, k can be defined relative to point A, such that k=0 corresponds to a subcarrier centered at point A. The physical resource block is defined within the bandwidth portion (BWP) and ranges from 0 to... Number, where i is the BWP number. BWP Physical resource blocks in With public resource blocks The relationship between them can be given by Equation 2 below.

[0126] [Equation 2]

[0127]

[0128] here, It can be a public resource block, where BWP starts relative to public resource block 0.

[0129] Bandwidth Component (BWP)

[0130] In NR systems, each carrier can support up to 400 MHz. If a UE operating on such a wideband carrier always operates with the radio frequency (RF) module enabled for all carriers, the UE's battery consumption may increase. Alternatively, considering several use cases operating on a wideband carrier (e.g., eMBB, URLLC, mMTC, V2X, etc.), different sets of parameters (e.g., subcarrier spacing) can be supported for each frequency band within the corresponding carrier. Alternatively, each UE's capability for the maximum bandwidth may differ. With this in mind, the base station (BS) can instruct the UE to operate only within a portion of the wideband carrier's bandwidth, rather than the entire bandwidth, and this portion of bandwidth is defined as the bandwidth portion (BWP). In the frequency domain, the BWP is a subset of adjacent common resource blocks defined for the parameter set µi within the bandwidth portion i on the carrier, and a set of parameters (e.g., subcarrier spacing, CP length, slot / mini-slot duration) can be configured.

[0131] The BS can configure one or more BWPs within a carrier configured for the UE. Alternatively, if UEs are concentrated on a specific BWP, some UEs can be transferred to different BWPs for load balancing. Alternatively, two BWPs can be configured in the same time slot, excluding some central spectrum of the entire bandwidth, taking into account frequency domain inter-cell interference cancellation between adjacent cells, etc. That is, the BS can configure at least one DL / UL BWP for a UE associated with a broadband carrier, activate at least one of the configured DL / UL BWPs at a specific time (via L1 signaling (which is a physical layer control signal), MAC control element (CE) (which is a MAC layer control signal), or RRC signaling, etc.), and instruct a handover to another configured DL / UL BWP (via L1 signaling, MAC CE, or RRC signaling, etc.), or, if a timer value is set and the timer expires, the UE can handover to a given DL / UL BWP. The activated DL / UL BWP is defined as the active DL / UL BWP. When the UE is in the initial access procedure or has not yet established an RRC connection, the UE may not be able to receive configuration for the DL / UL BWP. In this case, the DL / UL BWP assumed by the UE is defined as the initial active DL / UL BWP.

[0132] Physical channels and general signal transmission

[0133] Figure 3 This illustrates the physical channels and general signal transmissions used in a 3GPP system. In a wireless communication system, the UE receives information from the eNB via the downlink (DL) and transmits information to the eNB via the uplink (UL). The information transmitted and received by the eNB and UE includes data and various control information, and various physical channels exist depending on the type / purpose of the information transmitted and received by the eNB and UE.

[0134] When the UE powers on or enters a new cell, it performs an initial cell search operation, such as synchronizing with the eNB (S301). To do this, the UE can receive the primary synchronization signal (PSS) and secondary synchronization signal (SSS) from the eNB, synchronize with the eNB, and obtain information such as the cell ID. Subsequently, the UE can receive the physical broadcast channel (PBCH) from the eNB and obtain intra-cell broadcast information. During the initial cell search step, the UE receives a downlink reference signal (DL RS) to check the downlink channel state.

[0135] After completing the initial cell search, the UE receives the Physical Downlink Control Channel (PDCCH) and the Physical Downlink Shared Channel (PDSCH) based on the information loaded on the PDCCH to obtain more specific system information (S302).

[0136] When no radio resources are available for initial access to the eNB or for signal transmission, the UE can perform a random access procedure (RACH) with the eNB (S303 to S306). For this purpose, the UE can transmit a specific sequence in the form of a preamble via the Physical Random Access Channel (PRACH) (S303 and S305), and receive a response message (Random Access Response (RAR) message) for that preamble via the PDCCH and the corresponding PDSCH. In the case of a contention-based RACH, a contention resolution procedure can also be performed (S306).

[0137] The UE that performs the above procedure can then perform PDCCH / PDSCH reception (S307) and Physical Uplink Shared Channel (PUSCH) / Physical Uplink Control Channel (PUCCH) transmission (S308) in the same manner as the general uplink / downlink signal transmission procedure. Specifically, the UE can receive downlink control information (DCI) via PDCCH.

[0138] The UE monitors a set of PDCCH candidates during monitoring periods configured for one or more control element sets (CORESETs) on the serving cell, based on the corresponding search space configuration. The set of PDCCH candidates to be monitored by the UE is defined according to the search space set, which can be a common search space set or a UE-specific search space set. A CORESET consists of a set of (physical) resource blocks with a duration of 1 to 3 OFDM symbols. The network can configure the UE to have multiple CORESETs. The UE monitors PDCCH candidates in one or more search space sets. Here, monitoring means attempting to decode PDCCH candidates in the search space. If the UE successfully decodes one PDCCH candidate from the PDCCH candidates in the search space, the UE determines that a PDCCH has been detected from the PDCCH candidates and performs PDSCH reception or PUSCH transmission based on the DCI within the detected PDCCH.

[0139] The PDCCH can be used to schedule DL transmissions on the PDSCH and UL transmissions on the PUSCH. The DCI on the PDCCH includes downlink assignment (i.e., DL grant) related to the downlink shared channel, and at least includes modulation and coding scheme and resource allocation information; or uplink grant (UL grant) related to the uplink shared channel, and includes modulation and coding scheme and resource allocation information. The DCI has different formats depending on its purpose.

[0140] Control information sent by the UE to the eNB via the uplink or received by the UE from the eNB may include downlink / uplink ACK / NACK signals, channel quality indicator (CQI), precoding matrix index (PMI), rank indicator (RI), etc. The UE can send control information such as CQI / PMI / RI via PUSCH and / or PUCCH.

[0141] Synchronization Signal Block (SSB) transmission and related operations

[0142] Figure 4 An SSB structure in which the methods proposed in this disclosure can be applied is shown. The UE can perform cell search, system information acquisition, beam alignment for initial access, DL measurements, etc., based on the SSB. The SSB can be used interchangeably with the Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block.

[0143] Reference Figure 4 The SSB includes the PSS, SSS, and PBCH. The SSB consists of four consecutive OFDM symbols, on which the PSS, PBCH, SSS / PBCH, or PBCH are transmitted. The PSS and SSS each consist of one OFDM symbol and 127 subcarriers, and the PBCH consists of three OFDM symbols and 576 subcarriers.

[0144] Polar coding and quadrature phase shift keying (QPSK) are applied to the PBCH. The PBCH consists of data REs and demodulation reference signal (DMRS) REs on each OFDM symbol. There are three DMRS REs in each RB, and three data REs exist between the DMRS REs.

[0145] Figure 5 An SSB transmission in which the methods proposed in this disclosure can be applied is shown.

[0146] SSBs are transmitted periodically according to the SSB period. The default SSB period assumed by the UE during initial cell search is defined as 20 ms. After cell access, the network (e.g., the BS) can set the SSB period to one of {5 ms, 10 ms, 20 ms, 40 ms, 80 ms, 160 ms}. SSB burst sets are configured at the beginning of the SSB period. An SSB burst set consists of a 5 ms time window (i.e., half a frame), and an SSB can be transmitted up to N times within the burst set. The maximum number of SSB transmissions L can be given according to the carrier's frequency band as follows. One time slot includes up to two SSBs.

[0147] - For frequency ranges up to 3 GHz, L = 4

[0148] - For the frequency range of 3 GHz to 6 GHz, L = 8

[0149] - For the frequency range of 6 GHz to 52.6 GHz, L = 64

[0150] The temporal position of an SSB candidate within an SSB burst set can be defined as follows: The temporal position of an SSB candidate is indexed from 0 to L-1 based on the temporal order within the SSB burst set (i.e., half-frame) (SSB index).

[0151] Multiple SSBs can be transmitted within the carrier's frequency span. The physical layer cell identifiers of these SSBs do not need to be unique, and other SSBs can have different physical layer cell identifiers.

[0152] The UE can obtain DL synchronization by detecting SSBs. The UE can identify the structure of the SSB burst set based on the detected SSB (time) index, thereby detecting symbol / slot / half-frame boundaries. System Frame Number (SFN) information and half-frame indication information can be used to identify the frame / half-frame number to which the detected SSB belongs.

[0153] The foregoing can be combined and applied to the methods described below in this disclosure, or can be supplemented to clarify the technical features of the methods described in this disclosure. The methods described below are distinguished only for ease of explanation. Therefore, it is obvious that any part of the configuration of one method can be replaced or combined with a part of the configuration of another method.

[0154] Technical terms used in this disclosure

[0155] UE: User Equipment

[0156] SSB: Synchronization Signal Block

[0157] MIB: Master Information Block

[0158] RMSI: Residual Minimum System Information

[0159] FR1: Frequency Range 1. It refers to the frequency range of 6 GHz or lower (e.g., 450 MHz to 6,000 MHz).

[0160] FR2: Frequency Range 2. It refers to the millimeter wave (mmWave) frequency region of 24 GHz or higher (e.g., 24,250 MHz to 52,600 MHz).

[0161] BW: Bandwidth

[0162] BWP: Bandwidth section

[0163] RNTI: Temporary Identifier for Radio Networks

[0164] CRC: Cyclic Redundancy Check

[0165] SIB: System Information Block

[0166] SIB1: For NR devices, SIB1 = RMSI (Remaining Minimum System Information). It broadcasts information required for NR UE cell access, etc.

[0167] CORESET (Control Resource Set): The time / frequency resources for the NR UE to attempt candidate PDCCH decoding.

[0168] CORESET#0: CORESET for the Type0-PDCCH CSS set of NR devices (configured in the MIB)

[0169] Type0-PDCCH CSS set: Search space set, where the NR UE monitors the set of PDCCH candidates for DCI format with CRC scrambled by SI-RNTI.

[0170] MO: PDCCH monitoring timing for Type 0-PDCCH CSS set

[0171] SIB1-R: (Additional) SIB1 for NR devices with reduced capabilities. It may be limited when generated using a different TB than SIB1 and transmitted on a separate PDSCH.

[0172] CORESET#0-R: CORESET#0 for NR devices with reduced capability.

[0173] Type 0-PDCCH-R CSS set: Search space set, in which a capability-reduced (Redcap) UE monitors a set of PDCCH candidates for DCI format with CRC scrambled by SI-RNTI.

[0174] MO-R: PDCCH monitoring timing for the Type0-PDCCH CSS set.

[0175] Cell-limited SSB (CD-SSB): An SSB in the NR SSB that includes RMSI scheduling information.

[0176] Non-Cell-Defined SSB (Non-CD-SSB): An SSB deployed on the NR synchronization grid but which does not include the RMSI scheduling information of the corresponding cell to be measured. However, the SSB may include information notifying the location of the cell-defined SSB.

[0177] SCS: Subcarrier Spacing

[0178] SI-RNTI: System Information Radio Network Temporary Identifier

[0179] Camp on: "Camp on" refers to the state in which a UE remains on a cell and is ready to initiate a potential dedicated service or receive an ongoing broadcast service.

[0180] TB: Transport Block

[0181] RSA (Redcap Standalone): A cell that only supports Redcap devices or services.

[0182] SIB1(-R)-PDSCH: PDSCH sends SIB1(-R)

[0183] SIB1(-R)-DCI: DCI scheduler SIB1(-R)-PDSCH. DCI format 1_0 with CRC scrambled by SI-RNTI.

[0184] SIB1(-R)-PDCCH: PDCCH sends SIB1(-R)-DCI

[0185] FDRA: Frequency Domain Resource Allocation

[0186] TDRA: Time Domain Resource Allocation

[0187] RA: Random Access

[0188] MSGA: Preamble and payload transmission for a 2-step RA type random access procedure.

[0189] MSGB: Response to MSGA during the 2-step random access process. MSGB may include responses for contention resolution, backoff instructions, and avoidance instructions.

[0190] RO-N: RACH timing (RO) for normal UE 4-step RACH and 2-step RACH (if configured).

[0191] RO-N1, RO-N2: If a separate RO is configured for a normal UE 2-step RACH, it is divided into RO-N1 (4 steps) and RO-N2 (2 steps).

[0192] RO-R: RACH timing (RO) configured separately from RO-N for Redcap UE 4-step RACH and 2-step RACH (if configured).

[0193] RO-R1, RO-R2: If a separate RO is configured for Redcap UE 2-step RACH, it is divided into RO-R1 (4 steps) and RO-R2 (2 steps).

[0194] PG-R: MsgA preamble group for RedCap UE

[0195] RAR: Random Access Response

[0196] RAR window: A time window used to monitor RA response.

[0197] FH: Frequency jump

[0198] iBWP: Initial BWP

[0199] iBWP-DL(-UL): Initial DL(UL)BWP

[0200] iBWP-DL(-UL)-R: (Standalone) DL(UL) BWP for RedCap

[0201] CS: Circular shift

[0202] NB: Narrowband

[0203] TO: Traffic Offloading

[0204] mMTC; Massive Machine Type Communication

[0205] eMBB: Enhanced Mobile Broadband Communication

[0206] URLLC: Ultra-Reliable Low-Latency Communication

[0207] RedCap: Reduced Capability

[0208] eRedCap: Enhanced RedCap

[0209] FDD: Frequency Division Duplex

[0210] HD-FDD: Half-duplex FDD

[0211] DRX: Discontinuous Receiver

[0212] RRC: Radio Resource Control

[0213] RRM: Radio Resource Management

[0214] IWSN: Industrial Wireless Sensor Network

[0215] LPWA: Low Power Wide Area Network

[0216] RB: Resource Block

[0217] CCE: Control Channel Unit

[0218] AL: Aggregation Level

[0219] PRG: Physical Resource Block Group

[0220] DFT-s-OFDM: DFT spread spectrum OFDM

[0221] PBCH: Physical Broadcast Channel

[0222] A-PBCH: Additional PBCH

[0223] BD: Blind Testing

[0224] EPRE: Energy per RE

[0225] SNR: Signal-to-noise ratio

[0226] TDM: Time Division Multiplexing

[0227] DMRS: Demodulation Reference Signal

[0228] TDD: Time Division Duplex

[0229] In this disclosure, “()” can be interpreted as either excluding the content within the parentheses or including the content within the parentheses.

[0230] In this disclosure, “ / ” can be interpreted as including all content separated by “ / ” (and), or as including only a portion of the separated content (or).

[0231] Compared to previous generation wireless communication systems (such as LTE and GSM), 5G wireless communication systems are characterized by their efficient support for use cases such as mMTC, eMBB, and URLLC. Due to these advantages, 5G wireless communication systems are expected to create new use cases and gradually replace previous generation wireless communication systems for a wide range of applications.

[0232] The enhanced low latency, high reliability, and massive connectivity features of 5G wireless communication systems can be applied to use cases that were previously supported in narrowband (NB) (hereinafter referred to as NB use cases), as shown below.

[0233] [Example of a narrowband-based use case (NB use case)]

[0234] i) Railway mobile communication

[0235] ii) Utility / Infrastructure Network

[0236] iii) Public safety mobile communications

[0237] These NB use cases have previously been supported using previous-generation wireless communication systems in frequency bands below 1 GHz with a bandwidth of approximately 3 MHz. Similarly, when 5G wireless communication systems are intended to support NB use cases, these cases can be supported, for example, in the same frequency band (below 1 GHz) with a similar frequency bandwidth (approximately 3 MHz and below 5 MHz). However, since the minimum channel bandwidth (BW) supported by the current 5G NR standard is 5 MHz, channel bandwidths below 5 MHz should be supported first.

[0238] [Example of 5G NR bands supported for NB use cases (TS38.101-1)]

[0239] NB use cases can be supported in the following NR operating bands defined in NR standard TS38.101-1.

[0240] [Table 5]

[0241]

[0242] Table 5 shows the UL / DL operating bands defined by the NR operating band in frequency range 1 FR1.

[0243] [Example of channel BW definition for NB use cases supporting channels smaller than 5 MHz]

[0244] Table 6 shows the maximum number of configurable resource blocks (N) for each UE channel BW.RB Example of ). According to Table 6, in order to support NB use cases based on 5G NR, a 3 MHz UE channel BW is defined and the maximum number of configurable resource blocks (N) in the 3 MHz UE channel BW is defined. RB The value is defined as 15, and in this case, the resource utilization rate (or RU) (%) is defined. RU can be defined as follows.

[0245] [Table 6]

[0246]

[0247] Furthermore, for the newly defined 3 MHz UE channel BW, considering interference between adjacent channels and resource utilization, other N values ​​shown in Table 7 below can be defined and used. RB value.

[0248] [Table 7]

[0249]

[0250] For example, channel BW / N RB The same value can be applied to DL and UL. For example, channel BW / N RB DL and UL can be configured / supported separately / independently. The method described in the second example can be applied in the following situations. This method can be applied when the following conditions are intended: when N is determined... RB When the value is set, additional DFT precoding is applied only on UL, while considering interference between adjacent channels and resource utilization, supporting the maximum channel BW / N between DL and UL. RB value.

[0251] Figure 6 This is a flowchart illustrating the reception of DL signals / channels during the initial access process to which the method according to embodiments of this disclosure is applicable. (Refer to...) Figure 6 During the initial access process, a 5G NR UE can receive DL signals / channels in the order of S610 to S640. Specific details regarding the initial access process are as follows... Figures 3 to 5 The descriptions in the text are the same, so repeated descriptions will be omitted.

[0252] Existing NR UEs can receive CORESET#0 information via the Master Information Block (MIB) transmitted on the PBCH and receive the initial DL signal / channel via the CORESET#0 band during initial access. However, considering the channel bandwidths (BW) shown in Tables 6 and 7 and the CORESET#0 bandwidth supported in the NR standard, the operation according to the above conventional method may be inefficient.

[0253] This disclosure proposes the following methods for supporting the transmission / reception of DL broadcast signals / channels for initial access in narrowband.

[0254] In this disclosure, narrowband and NB can be interpreted / applied interchangeably. Furthermore, channel BW, N... RB The allowed / supported transfer BW, (punched / non-punched) PBCH BW, and maximum transfer BW can be interpreted / applied interchangeably.

[0255] In this disclosure, in addition to system information including SIB1 and MIB, broadcast signaling also includes a signaling method that uses PBCH payload, PBCH scrambling sequence and PBCH DMRS sequence initialization information generated in the PHY layer.

[0256] In this disclosure, broadcast signaling may include different definitions or interpretations of existing bits / fields. For example, if it is no longer necessary to signal some of the signaling methods based on the MIB used for existing broadcast signaling, the PBCH payload generated in the PHY layer in addition to the MIB, and the PBCH scrambling sequence and PBCH DMRS sequence initialization information, then the broadcast signaling may include newly defined bits / fields and signaled accordingly. For example, broadcast signaling may include using the subCarrierSpacingCommon (1 bit, {15kHz, 30kHz}) in the MIB for other 1-bit broadcast signaling purposes in a narrowband band that only supports 15kHz SCS. If it is possible to schedule DCI transmissions for new UEs via PBCH / SIB1 / SIB1 without affecting legacy UEs through frequency bands, dedicated spectrum, dedicated synchronization grids, etc., then the aforementioned broadcast signaling may include signaling methods performed by newly defining and different interpretations of bits / fields already used for broadcast signaling purposes in existing legacy UEs.

[0257] Methods for sending and receiving PBCH

[0258] To support NR DL broadcast signal reception in a narrowband with a bandwidth of 5 MHz, a subset of PBCH transport resource blocks (RBs) can be transmitted. In this disclosure, "transmitting a subset of PBCH transport RBs" can mean "transmitting the PBCH based on a subset of the RBs allocated to the PBCH".

[0259] In this disclosure, the PBCH transmission RB can refer to the time-frequency structure of the SS / PBCH (e.g., see [reference]). Figure 7 The RBs associated with or allocated to the PBCH in the PBCH. In this disclosure, "PBCH transport RB subset" may mean the RB subset associated with or allocated to the PBCH.

[0260] In this disclosure, the PSS / SSS transmission RB can refer to the time-frequency structure of the SS / PBCH (e.g., see [reference]). Figure 7 RBs associated with PSS / SSS or RBs assigned to PSS / SSS.

[0261] In this disclosure, a resource block (RB) may be interpreted / replaced as a physical resource block (PRB) or a common resource block (CRB).

[0262] Figure 7 An example of the time-frequency structure of an SSB according to an embodiment of this disclosure is shown. For example, the time-frequency structure of an SSB may be defined in the NR standard.

[0263] Specifically, Figure 7 It shows the results for each domain in Figure 4 The time-frequency structure includes the number of REs / RBs. (Refer to...) Figure 7 The frequency domain (bandwidth) used for PSS and SSS consists of 127 resource elements (REs). The frequency domain (bandwidth) of PBCH consists of 20 resource blocks (RBs) (=144 REs) or 4 RBs (=48 REs).

[0264] For example, a base station may need to exclude or puncture at least five PBCHs from a PBCH consisting of 20 PRBs to transmit RBs, and transmit the remaining RBs in order to support the specification of N. RB =PBCH transmission / reception in a 3MHz channel BW of 15 PRBs. That is, the base station can transmit a subset of up to 15 of the total 20 PBCH transmission RBs. In addition, all PSS / SSS transmission RBs can be transmitted for the same level of synchronization and measurement performance as existing NR UEs. In this case, the minimum PBCH transmission RBs can be 12 RBs including PSS / SSS.

[0265] In this disclosure, "punctured" PBCH or a subset of PBCH transport RBs refers to the PBCH actually transmitted after the puncturing application when a subset of the PBCH transport RBs is punctured and transmitted. Therefore, "punctured PBCH" and "subset of PBCH transport RBs" can be interpreted / used interchangeably.

[0266] As specified in the example above, N RB In a 3MHz channel BW with 15 PRBs, the BS / UE can configure a PBCH transmission RB subset using 12 to 15 PRBs. The methods for configuring the PBCH transmission RB subset using 12 and 15 PRBs are described in detail below.

[0267] [Method #P1]

[0268] One approach could be to use 12 PRBs, including PSS / SSS, to configure the PBCH to transmit a subset of RBs.

[0269] Method #P1 is the case where only 12 PRBs, including PSS / SSS, are used to configure the PBCH transport RB subset. That is, the PBCH transport RB subset can be configured using the minimum RB subset that includes all PSS / SSS (e.g., Figure 8 Method #P1 can be efficient when it is intended to be applied to all kinds of narrowband channel BWs by defining a punched PBCH or a subset of PBCH transmission RBs.

[0270] Figure 8 An example of a frequency resource domain for PBCH transmission / reception according to an embodiment of this disclosure is shown. Specifically, Figure 8 An example of PBCH transmission of a subset of RBs based on method #P1 is shown.

[0271] [Method #P2]

[0272] One approach could be to use 15 PRBs, including PSS / SSS, to configure the PBCH to transmit a subset of RBs.

[0273] Method #P2 is the case where 15 PRBs, including PSS / SSS, are used to configure the PBCH to transmit a subset of RBs.

[0274] The PBCH transmission RB subset (i.e., detailed configuration of 15 PRBs) according to embodiments of this disclosure can be determined based on one of the following methods #P2-1 to #P2-4.

[0275] Method #P2-1: Center 12 PRB (for PSS / SSS) + Lower 3 PRB

[0276] Method #P2-2: Center 12 PRB (for PSS / SSS) + Higher 3 PRB

[0277] Method #P2-3: Center 12 PRB (for PSS / SSS) + Lower 2 PRB + Higher 1 PRB

[0278] Method #P2-4: Center 12 PRB (for PSS / SSS) + Higher 2 PRB + Lower 1 PRB

[0279] Due to the characteristics of PBCH RE mapping, prioritizing the transmission of lower RBs in the PBCH transmission may have a slight performance advantage. Therefore, all other things being equal, method #P2-1 instead of method #P2-2 may have an advantage in PBCH reception performance. Furthermore, method #P2-3 instead of method #P2-4 may have an advantage in PBCH reception performance.

[0280] In cases where the PSS / SSS is exposed to interference from adjacent channels / bands due to band edge exposure, methods #P2-1 and #P2-2 may be affected in terms of synchronization and measurement performance. If the impact of interference is anticipated, methods #P2-3 or #2-4 can be considered. In methods #P2-3 or #2-4, the PSS / SSS can be further positioned within the channel band width (BW), thus protecting the PSS / SSS from interference from adjacent channels / bands. See below for reference. Figure 9 This needs to be explained.

[0281] Figure 9 An example of a frequency resource domain for PBCH transmission / reception according to another embodiment of this disclosure is shown.

[0282] Figure 9 (a) illustrates method #P2-1. In this case, the PBCH transport RB subset may include a central 12 PRBs (for PSS / SSS) + a lower 3 PRBs.

[0283] Figure 9 (b) illustrates method #P2-3. In this case, the PBCH transport RB subset may include a central 12 PRBs (for PSS / SSS) + two lower PRBs + one higher PRB.

[0284] If the maximum transmission bandwidth (BW) defined in narrowband is N RB Then, the PBCH transmission RB subset based on method #P2-3 / method #P2-4 can be determined as follows.

[0285] Method #P2-3: Center 12 PRB + lower ceil [(N RB -12) / 2] PRB+higher floor[(N RB -12) / 2]PRB

[0286] Method #P2-4: Center 12 PRB + lower floor [(N RB -12) / 2] PRB+higher ceil [(N RB -12) / 2]PRB.

[0287] The method described above for determining the RB subset of PBCH transmissions can be implemented / applied as follows.

[0288] For example, one method for determining the RB subset of PBCH transmissions can be consistently applied to all narrowband frequencies.

[0289] For example, methods for determining subsets of PBCH transmission RBs can be defined / applied on a narrowband basis. In other words, methods for determining subsets of PBCH transmission RBs can be predefined such that they are applied on a narrowband basis. As a concrete example, a table representing methods for determining subsets of PBCH transmission RBs applied on a narrowband basis can be predefined.

[0290] For example, a dedicated synchronization grid can be used to differentiate the methods for determining the subset of RBs in a PBCH transmission. In other words, a dedicated synchronization grid can be used to determine the methods for determining the subset of RBs in a PBCH transmission.

[0291] For example, the base station can determine one of the methods for determining the RB subset of PBCH transmissions and can configure / indicate it to the UE via broadcast signaling.

[0292] The method for determining the subset of PBCH transmission RBs can be determined / applied / indicated based on a combination of examples.

[0293] [Method #1]

[0294] One approach could be to apply the same punched PBCH to all narrowband frequencies.

[0295] According to method #1, the punctured PBCH determined by methods such as method #P1 and method #P2 is applied to all narrowband frequencies. For example, a punctured PBCH consisting of 12 PRBs (in short, 12-RBPBCH) can be defined based on method #P1. The 12-RB PBCH can be applied equally to both narrowband frequencies with a channel BW of 12 PRBs and narrowband frequencies with a channel BW of 15 PRBs.

[0296] Since the BS / UE only needs to support a single punctured PBCH, it may have an advantage in terms of complexity. However, PBCH performance may be somewhat degraded compared to supporting a PBCH consisting of more than 12 PRBs (e.g., 15 PRBs). See below for reference. Figure 10 This needs to be explained.

[0297] Figure 10 An example of an application method for a frequency resource domain for PBCH transmission / reception according to an embodiment of the present disclosure is shown. Figure 10(a) shows the application of a 12-RB PBCH based on method #P1 to a narrowband channel with a BW of 12 PRBs. Figure 10 (b) shows the application of a 12-RB PBCH based on method #P1 to a narrowband channel with a BW of 15 PRBs.

[0298] [Method #2]

[0299] One approach could be to define multiple punctured PBCHs and apply the punctured PBCHs by narrowband (or by carrier BW).

[0300] According to method #2, multiple punctured PBCHs are defined based on methods such as method #P1 and method #P2, and each of the multiple punctured PBCHs is applied by narrowband or by carrier BW.

[0301] For example, 12-RB PBCH and 15-RB PBCH can be defined based on methods #P1 and #P2, respectively. If the narrowband channel BW is less than 15 PRBs, a 12-RB PBCH can be applied. If the narrowband channel BW is greater than or equal to 15 PRBs, a 15-RB PBCH can be applied. Because method #2 requires support for multiple punctured PBCHs compared to method #1, it may increase BS / UE complexity. On the other hand, it may have advantages in PBCH performance due to the application of a subset of PBCH RBs suitable for the narrowband channel BW. See below for further details. Figure 11 This needs to be explained.

[0302] Figure 11 An example of an application method for a frequency resource domain for PBCH transmission / reception according to another embodiment of this disclosure is shown. Figure 11 (a) shows the application of a 12-RB PBCH based on method #P1 to a narrowband channel with a BW of 12 PRBs. Figure 11 (b) shows the application of a 15-RB PBCH based on method #P2 to a narrowband channel with a BW of 15 PRBs.

[0303] [Method #A]

[0304] One approach could be to support PBCH punching based on network configuration.

[0305] The following operations / configurations can be applied to flexibly support methods #1 and #2 via BS selection. The PBCH with puncturing applied based on the narrowband frequency band or carrier BW is not fixed and can be determined based on the default configuration and / or BS indication. Specifically, a "default" puncturing PBCH can be defined that is essentially assumed when the UE receives an SSB in the narrowband. In practice, the PBCH information with puncturing applied by the base station in the corresponding narrowband frequency band or carrier BW can be indicated to the UE via broadcast signaling. For example, if the channel BW is 15 PRBs, then the 12-RB PBCH can be defined as the default puncturing PBCH. The base station can indicate either the 12-RB PBCH or the 15-RB PBCH to the UE based on broadcast signaling.

[0306] For the purposes described above, the information indicated by the base station via broadcast signaling may be related to a punctured PBCH transmitted in the corresponding narrowband frequency band or carrier BW. In this case, punctured PBCHs that can be predefined by the network (or standard-supported punctured PBCHs) can be indicated via broadcast signaling.

[0307] Alternatively, the punctured PBCH information transmitted via broadcast signaling for the aforementioned purposes may be information indicating additional PBCH transmission RE / RBs transmitted in addition to the default punctured PBCH assumed by the UE prior to the broadcast signaling. For example, it may be assumed that the default punctured PBCH is a 12-RB PBCH, and the actually transmitted punctured PBCH is a 15-RB PBCH. The punctured PBCH information transmitted based on broadcast signaling may indicate that the additional punctured PBCH transmission RB value is 3.

[0308] Furthermore, the broadcast signaling information (punctured PBCH information) may include information about the location of the RB to which the additional punctured PBCH transmission is sent. In this case, in the example above, the broadcast signaling information (punctured PBCH information) may include i) the additional punctured PBCH RB value 3 and ii) information indicating the location associated with the additional punctured PBCH transmission RB. For example, the location information may indicate whether the corresponding punctured PBCH is sent near the minimum RB index or near the maximum RB index.

[0309] In method #A, the UE may assume a default punctured PBCH and receive the PBCH in all narrowband frequencies or in narrowband frequencies predefined in the standard. If the UE obtains additional or actually transmitted punctured PBCH information via broadcast signaling, the UE may receive the punctured PBCH based on the corresponding broadcast signaling information.

[0310] Information such as CORESET#0 BW and the initial DL BWP can be transmitted by indicating the punctured PBCH via broadcast signaling in method #A. Furthermore, CORESET#0 BW, the initial DL BWP, etc., can be determined by the punctured PBCH indicated via broadcast signaling in method #A. For example, the punctured PBCH indicated by method #A can be applied to CORESET#0 BW and / or the initial DL BWP.

[0311] It may be necessary for new UEs supporting narrowband operation to be required to support all punctured PBCHs defined / introduced for narrowband BS / UE operation. For example, if both 12-RB PBCH and 15-RB PBCH are supported, then new UEs supporting narrowband operation may be required to support both 12-RB PBCH and 15-RB PBCH.

[0312] Alternatively, new UEs supporting narrowband operation may be allowed to selectively support PBCHs with puncturing defined / introduced for narrowband BS / UE operation. For example, support for the default PBCH with puncturing described above may be enforced, and support for additionally supported PBCHs with puncturing may be selectively allowed. UE requirements may be defined by narrowband frequency band.

[0313] Regarding the frequency resource domain, the operations / configurations are defined based on Table 8 below.

[0314] [Table 8]

[0315]

[0316] The following reference Figure 12 This will be described.

[0317] Figure 12 Point A is shown according to the existing method. Specifically, Figure 12 The offsetToPointA is shown based on Table 8. (Refer to...) Figure 12 , offsetToPointA represents the frequency offset between point A and the lowest subcarrier (subcarrier 0) of the lowest resource block (CRB#8) that overlaps with the SS / PBCH block. This indicates the lowest subcarrier number (subcarrier 0) of the SS / PBCH block and the common resource block ( Subcarrier offsets between subcarriers 0 in the common resource block () ) is obtained from offsetToPointA. That is to say, the public resource block ( It can be the lowest resource block that overlaps with the SS / PBCH block based on offsetToPointA.

[0318] This can be indicated by the parameter ssb-SubcarrierOffset within a system information block (e.g., MIB). For example, It can be indicated by an integer between 0 and 15. If the parameter ssb-SubcarrierOffset is not provided, it can be derived from the frequency difference between the SS / PBCH block and point A. .

[0319] As described above in [Method #P1 for configuring a subset of RBs for PBCH transmission using 12 PRBs including PSS / SSS] or [Method #P2 for configuring a subset of RBs for PBCH transmission using 15 PRBs including PSS / SSS], it can be assumed that the entire SSB is not received due to PBCH puncturing. In this case, point A can be determined as follows.

[0320] The UE can determine offsetToPointA for the PCell downlink based on the SSB to obtain point A. The SSB can be based on i) the (actually) received SSB (SS / PBCH block) / (actually) transmitted SSB (SS / PBCH block) and / or ii) the SSB (SS / PBCH block) punctured (if SSB / PBCH puncturing is applied) / the SSB (SS / PBCH block after puncturing.

[0321] Point A can be obtained based on the SSB (SS / PBCH block) as follows.

[0322] - For the PCell downlink, offsetToPointA represents the frequency offset between the lowest subcarrier of the lowest resource block that overlaps with the SS / PBCH block used by the UE for initial cell selection and point A, and is expressed in units of resource blocks, assuming that the subcarrier spacing of FR1 is 15kHz and the subcarrier spacing of FR2 is 60kHz.

[0323] -absoluteFrequencyPointA represents the frequency location of point A in all other cases, expressed as an absolute radio frequency channel number (ARFCN).

[0324] Alternatively, in this case, the existing definition operation used to obtain point A of the UE can be modified, as shown in Table 9 below.

[0325] [Table 9]

[0326]

[0327] The following reference Figure 13 This will be described.

[0328] Figure 13Point A according to an embodiment of this disclosure is shown. (Omitted from Table 8 and...) Figure 12 Overlapping descriptions. (See reference) Figure 13 The punctured SS / PBCH block can consist of 12 resource blocks. According to an embodiment of this disclosure, offsetToPointA represents the frequency offset between point A and the lowest subcarrier (subcarrier 0) of the lowest resource block (CRB#12) that overlaps with the punctured SS / PBCH block.

[0329] The punching can be applied / interpreted by using a cut-off method.

[0330] From an implementation perspective, the operation of the UE / BS according to the above embodiments (e.g., operation based on at least one of method #P1, method #P2, method #1, method #2, or method #A) can be described below. Figure 16 Devices (e.g., Figure 16 Processors 110 and 210 are used to process it.

[0331] Furthermore, the operation of the UE / BS according to the above embodiments (e.g., operation based on at least one of method #P1, method #P2, method #1, method #2, or method #A) can be used to run at least one processor (e.g., Figure 16 The commands / programs (e.g., instructions, executable code) of the processors 110 and 210 are stored in memory (e.g., Figure 16 In the memory (140 and 240).

[0332] Below, refer to Figure 14 and Figure 15 The above implementation methods are described in detail from the perspective of UE / BS operation. The methods described below are distinguished only for ease of explanation. Therefore, it is obvious that any part of the configuration of any method can be replaced or combined with part of the configuration of another method.

[0333] Figure 14 This is a flowchart illustrating a method performed by a UE according to an embodiment of the present disclosure.

[0334] Reference Figure 14 According to embodiments of the present disclosure, the method performed by the UE includes step S1410 of receiving an SS / PBCH block and step S1420 of receiving configuration information including information related to point A.

[0335] In step S1410, the UE receives a synchronization signal / physical broadcast channel (SS / PBCH) block from the base station (BS).

[0336] For example, the SS / PBCH block can be a punched SS / PBCH block based on at least one of the above embodiments.

[0337] In step S1420, the UE receives configuration information from the base station, including information related to point A.

[0338] For example, information related to point A can be represented by the parameter offsetToPointA.

[0339] The time-frequency structure and point A of the SS / PBCH block can be based on at least one of the methods #P1, #P2, #1, #2, or #A described above. The relevant implementation methods are described in detail below.

[0340] According to the implementation, based on information associated with point A (e.g., parameter offsetToPointA), the frequency offset between i) point A and ii) the lowest subcarrier of the lowest resource block overlapping with the SS / PBCH block can be determined. The time-frequency structure associated with the SS / PBCH block (e.g., see...) Figures 8 to 11 and Figure 13 It can be based on puncturing. The lowest subcarrier of the lowest resource block can overlap with the punctured SS / PBCH block.

[0341] According to the implementation method, the SS / PBCH block after punching may include 12 or 15 resource blocks.

[0342] The 12 resource blocks can be based on an existing SS / PBCH time-frequency structure (e.g., see...). Figure 7 The remaining resource blocks are those from 20 resource blocks, excluding 8 resource blocks. Specifically, the 12 resource blocks can be the remaining resource blocks other than those based on subcarrier numbers 0 to 47 and 192 to 239 among the subcarriers based on subcarrier numbers 0 to 239 in the 4 orthogonal frequency division multiplexing (OFDM) symbols.

[0343] The channel bandwidth associated with cell search based on SS / PBCH blocks can be less than 5 MHz. For example, the channel bandwidth can be 3 MHz.

[0344] Common resource blocks / physical resource blocks and resource block grids can be defined / determined based on point A. This is described in detail below.

[0345] For example, a resource block can be defined as 12 consecutive subcarriers in the frequency domain. The common reference point of the resource block grid can be based on point A.

[0346] For example, common resource blocks (CRBs) can be numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of CRB 0 can coincide with point A. The lowest resource block can be a CRB that overlaps with the subcarrier 0 of the lowest resource block of the punctured SS / PBCH block (e.g., Figure 13 (CRB#12).

[0347] For example, a physical resource block can be defined within a bandwidth portion (BWP) of a subset of CRBs (e.g., a subset of consecutive CRBs). The CRB number associated with the PRB number can be determined based on i) the PRB number and ii) the sum of the CRB numbers of the BWP starting with CRB 0. As a specific example, if the BWP starts with CRB2, the CRB number associated with PRB3 could be 5. That is, a resource block can be identified / referred to as a CRB or a PRB. Specifically, a resource block can be identified based on its CRB number, and if the resource block is within a BWP, it can be identified based on its PRB number.

[0348] According to the implementation method, the SS / PBCH block after puncturing can be used by the UE for initial cell selection.

[0349] According to the implementation method, configuration information can be received based on broadcast signaling. Specifically, the configuration information can be based on a System Information Block (SIB) (e.g., SIB1). As a specific example, the configuration information can be based on the parameter FrequencyInfoDL-SIB according to SIB1. The parameter FrequencyInfoDL-SIB may include the parameter offsetToPointA. More specifically, SIB1 may include the parameter ServingCellConfigCommonSIB, the parameter ServingCellConfigCommonSIB may include the parameter DownlinkConfigCommonSIB, and the parameter DownlinkConfigCommonSIB may include the parameter FrequencyInfoDL-SIB.

[0350] The method may also include receiving information related to the SS / PBCH block. In this step, the UE can receive information related to the SS / PBCH block from the base station. This implementation can be based on method #A. Information related to the SS / PBCH block can be received based on broadcast signaling.

[0351] For example, information related to SS / PBCH blocks may include information about at least one of the following: i) the number of resource blocks associated with the punctured SS / PBCH block (e.g., 12, 15, the number of RBs (3) for sending SS / PBCH additionally on top of the default number of RBs (12)) and / or ii) the location associated with the resource blocks (e.g., the frequency location of the SS / PBCH block or the frequency location of the additional RBs).

[0352] For example, based on the default configuration, the number of resource blocks associated with the punctured SS / PBCH block can be determined before receiving information related to the SS / PBCH block. As a specific example, based on the default configuration, the number of resource blocks associated with the punctured SS / PBCH block can be determined to be 12. The UE can then receive the SS / PBCH block from the base station within these 12 resource blocks.

[0353] The operations based on steps S1410 and S1420, and the step of receiving information related to the SS / PBCH block, can be derived by... Figure 16 The device implementation. For example, UE 200 can control one or more transceivers 230 and / or one or more memories 240 to perform operations based on steps S1410 and S1420 and the step of receiving information related to the SS / PBCH block.

[0354] The above implementation method will now be described in detail from the perspective of BS operation.

[0355] Steps S1510 and S1520 described below, as well as the step of sending information related to the SS / PBCH block, correspond to the reference. Figure 14 Steps S1410 and S1420, as well as the step of receiving information related to the SS / PBCH block, are described below. Due to the above correspondence, repeated descriptions are omitted. That is, the detailed description of the BS operation described below can be replaced with the corresponding BS operation... Figure 14 Description / implementation method.

[0356] Figure 15 This is a flowchart illustrating a method performed by a base station according to another embodiment of the present disclosure.

[0357] Reference Figure 15 According to another embodiment of the present disclosure, the method performed by the base station includes the step of sending an SS / PBCH block, S1510, and the step of sending configuration information including information related to point A, S1520.

[0358] In step S1510, the base station sends a synchronization signal / physical broadcast channel (SS / PBCH) block to the UE.

[0359] In step S1520, the base station sends configuration information, including information related to point A, to the UE.

[0360] The method may also include sending information related to the SS / PBCH block. In this step, the base station may send information related to the SS / PBCH block to the UE.

[0361] The operations based on steps S1510 and S1520, as well as the step of sending information related to the SS / PBCH block, can be performed by... Figure 16 The device implementation. For example, base station 100 may control one or more transceivers 130 and / or one or more memories 140 to perform operations based on steps S1510 and S1520 and the step of sending information related to SS / PBCH blocks.

[0362] The following reference Figure 16 Describes the apparatus to which embodiments of this disclosure are applicable (apparatus for implementing the methods / operations according to embodiments of this disclosure).

[0363] Figure 16 The configurations of the first and second devices according to embodiments of the present disclosure are illustrated.

[0364] The first device 100 may include a processor 110, an antenna unit 120, a transceiver 130, and a memory 140.

[0365] Processor 110 can perform baseband-related signal processing and includes a higher-layer processing unit 111 and a physical layer processing unit 115. Higher-layer processing unit 111 can handle operations at the MAC layer, RRC layer, or higher layers. Physical layer processing unit 115 can handle PHY layer operations. For example, if the first device 100 is a base station (BS) device in BS-UE communication, physical layer processing unit 115 can perform uplink receive signal processing, downlink transmit signal processing, etc. For example, if the first device 100 is a first UE device in UE-to-UE communication, physical layer processing unit 115 can perform downlink receive signal processing, uplink transmit signal processing, sidelink transmit signal processing, etc. In addition to performing baseband-related signal processing, processor 110 can also control the overall operation of the first device 100.

[0366] Antenna unit 120 may include one or more physical antennas, and if antenna unit 120 includes multiple antennas, MIMO transmission / reception is supported. Transceiver 130 may include a radio frequency (RF) transmitter and an RF receiver. Memory 140 may store information processed by processor 110, as well as software, operating system, and applications related to the operation of first device 100. Memory 140 may also include components such as buffers.

[0367] In the embodiments described in this disclosure, the processor 110 of the first device 100 may be configured to implement the operation of the BS in BS-UE communication (or the operation of the first UE device in UE-UE communication).

[0368] The second device 200 may include a processor 210, an antenna unit 220, a transceiver 230, and a memory 240.

[0369] Processor 210 can perform baseband-related signal processing and includes a higher-layer processing unit 211 and a physical layer processing unit 215. Higher-layer processing unit 211 can handle operations at the MAC layer, RRC layer, or higher layers. Physical layer processing unit 215 can handle PHY layer operations. For example, if the second device 200 is a UE device in BS-UE communication, physical layer processing unit 215 can perform downlink receive signal processing, uplink transmit signal processing, etc. For example, if the second device 200 is a second UE device in inter-UE communication, physical layer processing unit 215 can perform downlink receive signal processing, uplink transmit signal processing, sidelink receive signal processing, etc. In addition to performing baseband-related signal processing, processor 210 can also control the overall operation of the second device 200.

[0370] Antenna unit 220 may include one or more physical antennas, and if antenna unit 220 includes multiple antennas, MIMO transmission / reception is supported. Transceiver 230 may include an RF transmitter and an RF receiver. Memory 240 may store information processed by processor 210, as well as software, operating system, and applications related to the operation of second device 200. Memory 240 may also include components such as buffers.

[0371] In the embodiments described in this disclosure, the processor 210 of the second device 200 may be configured to implement the operation of the UE in BS-UE communication (or the operation of the second UE device in inter-UE communication).

[0372] The descriptions of the BS and UE (or the first UE device and the second UE device in inter-UE communication) in the examples of this disclosure are equivalent to those for the operation of the first device 100 and the second device 200, and redundant descriptions are omitted.

[0373] In addition to LTE, NR, and 6G, the wireless communication technologies implemented in apparatus 100 and apparatus 200 according to this disclosure may also include narrowband Internet of Things (NB-IoT) for low-power communication. For example, NB-IoT technology may be an example of low-power wide-area network (LPWAN) technology and may be implemented in standards such as LTE Cat NB1 and / or LTE Cat NB2. NB-IoT technology is not limited to the names mentioned above.

[0374] Additionally or alternatively, the wireless communication technology implemented in apparatus 100 and apparatus 200 according to this disclosure may be based on LTE-M technology to perform communication. For example, LTE-M technology may be an example of LPWAN technology and may be referred to by various names, such as enhanced machine-type communication (eMTC). For example, LTE-M technology may be implemented using at least one of various standards, such as 1) LTE Cat0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-bandwidth limited), 5) LTE-MTC, 6) LTE machine-type communication, and / or 7) LTE M. LTE-M technology is not limited to the names mentioned above.

[0375] Additionally or alternatively, considering low-power communication, the wireless communication technologies implemented in apparatus 100 and apparatus 200 according to this disclosure may include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN), and are not limited to the aforementioned names. For example, ZigBee technology can be based on various standards such as IEEE 802.15.4 to create personal area networks (PANs) associated with small / low-power digital communication, and may be referred to by various names.

Claims

1. A method performed by a user equipment (UE), the method comprising: Receive synchronization signal / physical broadcast channel SS / PBCH block; as well as Receive configuration information including information related to point A. Specifically, based on the information associated with point A, the frequency offset between i) point A and ii) the lowest subcarrier of the lowest resource block overlapping with the SS / PBCH block is determined. The time-frequency structure associated with the SS / PBCH block is based on punched holes, and The lowest subcarrier of the lowest resource block overlaps with the SS / PBCH block after puncturing.

2. The method according to claim 1, wherein, The SS / PBCH block after punching includes 12 resource blocks or 15 resource blocks.

3. The method according to claim 2, wherein, The 12 resource blocks are the remaining resource blocks in the four Orthogonal Frequency Division Multiplexing (OFDM) symbols, excluding those based on subcarrier numbers 0 to 239.

4. The method according to claim 3, wherein, The channel bandwidth associated with cell search based on the SS / PBCH block is less than 5 MHz.

5. The method according to claim 1, wherein, A resource block is defined as 12 consecutive subcarriers in the frequency domain, and The common reference point of the resource block grid is based on point A.

6. The method according to claim 1, wherein, The SS / PBCH block after the puncturing is used by the UE for initial cell selection.

7. The method according to claim 1, wherein, Common resource blocks (CRBs) are numbered from 0 upwards in the frequency domain, and In this case, the center of subcarrier 0 of CRB 0 coincides with point A.

8. The method according to claim 7, wherein, The lowest resource block is the CRB that overlaps with the subcarrier 0 of the lowest resource block of the SS / PBCH block after the puncturing.

9. The method according to claim 7, wherein, The Physical Resource Block (PRB) is defined within the bandwidth portion (BWP) of a subset of the CRB.

10. The method according to claim 9, wherein, Based on i) the PRB number and ii) the sum of the CRB numbers starting from CRB 0, the BWP determines the CRB number associated with the PRB number.

11. The method according to claim 1, further comprising: Receive information related to the SS / PBCH block. Specifically, the information related to the SS / PBCH block is received based on broadcast signaling.

12. The method according to claim 11, wherein, The information associated with the SS / PBCH block includes information about at least one of the following: i) the number of resource blocks associated with the SS / PBCH block after the punching and / or ii) the location associated with the resource blocks.

13. The method according to claim 11, wherein, The number of resource blocks associated with the SS / PBCH block after the puncturing is determined based on the default configuration before the information related to the SS / PBCH block is received.

14. A user equipment (UE), the UE comprising: One or more transceivers; One or more processors; as well as One or more memories, said one or more memories being connected to said one or more processors and configured to store instructions. The instructions are based on the one or more processors being executed to configure the one or more processors to perform all the steps of the method according to any one of claims 1 to 13.

15. An apparatus comprising: One or more memory units; as well as One or more processors, said one or more processors being operatively connected to said one or more memories, Wherein, the one or more memories are configured to store instructions, and The instructions are based on being executed by the one or more processors to configure the one or more processors to perform all the steps of the method according to any one of claims 1 to 13.

16. One or more non-transitory computer-readable media storing instructions, in, The instructions, which can be executed by one or more processors, configure the one or more processors to perform all the steps of the method according to any one of claims 1 to 13.

17. A method performed by a base station, the method comprising: Send synchronization signal / physical broadcast channel SS / PBCH block; as well as Send configuration information including information related to point A. Specifically, based on the information associated with point A, the frequency offset between i) point A and ii) the lowest subcarrier of the lowest resource block overlapping with the SS / PBCH block is determined. The time-frequency structure associated with the SS / PBCH block is based on punched holes, and The lowest subcarrier of the lowest resource block overlaps with the SS / PBCH block after puncturing.

18. A base station operating in wireless communication, the base station comprising: One or more transceivers; One or more processors; as well as One or more memories, said one or more memories being connected to said one or more processors and configured to store instructions. The instructions are based on the one or more processors being executed to configure the one or more processors to perform all the steps of the method according to claim 17.

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