Method and apparatus for transmitting and receiving ssb

Abstract

A method according to an embodiment of the present specification comprises a step of receiving a synchronization signal / physical broadcast channel block (SS / PBCH block). The SS / PBCH block is received on the basis of the number of repetitions determined from among the numbers of repetitions based on the maximum number of repetitions. The maximum number of repetitions is defined on the basis of a frequency band.

Description

Method and device for SSB transmission and reception

[0001] This specification relates to a method and apparatus for SSB transmission and reception.

[0002] Mobile communication systems were developed to provide voice services while ensuring user mobility. However, mobile communication systems have expanded their scope to include data services as well as voice. Currently, due to the explosive increase in traffic leading to resource shortages and users demanding higher-speed services, more advanced mobile communication systems are required.

[0003] The requirements for next-generation mobile communication systems largely include the ability to accommodate explosive data traffic, a dramatic increase in transmission rates per user, a significantly increased number of connected devices, very low end-to-end latency, and high energy efficiency. To achieve this, various technologies are being researched, such as dual connectivity, massive multiple input multiple output (MMIMO), in-band full duplex, non-orthogonal multiple access (NOMA), super wideband support, and device networking.

[0004] On the other hand, while the high-frequency band has the advantage of higher transmission speeds due to its wide bandwidth available for communication, path loss tends to increase depending on the transmission and reception distance.

[0005] The purpose of this specification is to propose a method for solving the path loss problem described above. More specifically, the purpose of this specification is to propose a method with low implementation complexity for base stations / terminals while efficiently utilizing frequency / time resources without increasing the number of base station / terminal operation beams.

[0006] The technical problems to be solved in this specification are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which this invention belongs from the description below.

[0007] A method according to one embodiment of the present specification includes the step of receiving a Synchronization Signal / Physical Broadcast Channel Block (SS / PBCH block). The SS / PBCH block is received based on a number of repetitions determined from among a number of repetitions based on a maximum number of repetitions. The maximum number of repetitions is characterized by being defined based on a frequency band. Coverage can be improved through the repetition of the SS / PBCH block, thereby minimizing the impact of path loss. Furthermore, since the maximum number of repetitions related to the determination of the number of repetitions is defined based on a frequency band, the signaling overhead required to support the repetition of the SS / PBCH block and the complexity of base station / terminal implementation can be reduced.

[0008] According to an embodiment of the present specification, an SS / PBCH block can be received based on a number of repetitions determined based on a maximum number of repetitions defined for each frequency band, thereby improving coverage and the reception performance of the SS / PBCH block while reducing initial signaling overhead, such as setting the number of repetitions required for the repeated transmission of the SS / PBCH block.

[0009] In addition, since the repetition of the SS / PBCH block can be performed differently or selectively by frequency band, base station operational flexibility can be increased.

[0010] In addition, since the terminal performs reception operations only within the range of the maximum number of repetitions per frequency band, the terminal's power consumption can be reduced.

[0011] In addition, when SS / PBCH blocks are transmitted repeatedly, the complexity of terminal / base station implementation required to support the reception of said SS / PBCH blocks can be minimized. Specifically, since repeated transmission of SS / PBCH blocks can be supported for terminals without separate RRC settings related to the number of SS / PBCH block repetitions, the complexity of terminal / base station implementation can be reduced.

[0012] The effects obtainable in this specification are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description below.

[0013] FIG. 1 is a drawing illustrating an example of a communication system applicable to the present specification.

[0014] FIG. 2 is a drawing illustrating an example of a wireless device that can be applied to the present specification.

[0015] Figure 3 illustrates an SSB structure according to the existing method.

[0016] FIG. 4 illustrates a repeating structure of an SSB according to an embodiment of the present specification.

[0017] FIG. 5 shows an example of a transmitter according to an embodiment of the present specification.

[0018] FIG. 6 shows an example of a receiver according to an embodiment of the present specification.

[0019] FIG. 7 is a flowchart illustrating an example of a method for detecting the number of transmissions according to an embodiment of the present specification.

[0020] FIG. 8 shows another example of a receiver according to an embodiment of the present specification.

[0021] FIG. 9 is a flowchart illustrating another example of a method for detecting the number of transmissions according to an embodiment of the present specification.

[0022] FIG. 10 illustrates an operation related to PBCH generation according to an embodiment of the present specification.

[0023] FIG. 11 is a flowchart illustrating a method according to one embodiment of the present specification.

[0024] FIG. 12 is a flowchart illustrating a method according to another embodiment of the present specification.

[0025] The following embodiments are combinations of the components and features of this specification in a specific form. Each component or feature may be considered optional unless otherwise explicitly stated. Each component or feature may be implemented in a form not combined with other components or features. Additionally, some components and / or features may be combined to constitute the embodiments of this specification. The order of operations described in the embodiments of this specification may be changed. Some components or features of any embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment.

[0026] In the description of the drawings, procedures or steps that could obscure the gist of the specification have not been described, nor have procedures or steps that are understandable to those skilled in the art been described.

[0027] Throughout the specification, when a part is described as "comprising" or "including" a component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, terms such as "...part," "...unit," and "module" as used in the specification refer to a unit that performs at least one function or operation, and this may be implemented in hardware, software, or a combination of hardware and software. Additionally, "one (a or an)," "one," "the," and similar related terms may be used in the context describing this specification (particularly in the context of the following claims) to include both singular and plural forms, unless otherwise indicated in this specification or clearly contradicted by the context.

[0028] The embodiments of this specification have been described with a focus on the data transmission and reception relationship between a base station and a mobile station. Here, the base station refers to a terminal node of a network that communicates directly with a mobile station. Specific operations described herein as being performed by a base station may, in some cases, be performed by an upper node of the base station.

[0029] That is, in a network consisting of multiple network nodes including a base station, various operations performed for communication with a mobile station may be performed by the base station or other network nodes other than the base station. In this case, 'base station' may be replaced by terms such as fixed station, Node B, eNB (eNode B), gNB (gNode B), ng-eNB, advanced base station (ABS), or access point.

[0030] Additionally, in the embodiments of this specification, the term terminal may be replaced with terms such as user equipment (UE), mobile station (MS), subscriber station (SS), mobile subscriber station (MSS), mobile terminal, or advanced mobile station (AMS).

[0031] Furthermore, the transmitting end refers to a fixed and / or mobile node that provides data or voice services, and the receiving end refers to a fixed and / or mobile node that receives data or voice services. Therefore, in the case of the uplink, a mobile station can be the transmitting end and a base station can be the receiving end. Similarly, in the case of the downlink, a mobile station can be the receiving end and a base station can be the transmitting end.

[0032] The embodiments of this specification may be supported by standard documents disclosed in at least one of the wireless access systems, such as IEEE 802.xx systems, 3GPP (3rd Generation Partnership Project) systems, 3GPP LTE (Long Term Evolution) systems, 3GPP 5G (5th generation) NR (New Radio) systems and 3GPP2 systems, and in particular, the embodiments of this specification may be supported by the documents 3GPP TS (technical specification) 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.321 and 3GPP TS 38.331.

[0033] In addition, the embodiments of this specification may be applied to other wireless access systems and are not limited to the systems described above. For example, they may be applicable to systems applied after the 3GPP 5G NR system and are not limited to specific systems.

[0034] That is, obvious steps or parts not described in the embodiments of this specification may be described by referring to the aforementioned documents. Additionally, all terms disclosed in this specification may be explained by the aforementioned standard documents.

[0035] Hereinafter, preferred embodiments according to the present specification will be described in detail with reference to the accompanying drawings. The detailed description disclosed below, together with the accompanying drawings, is intended to describe exemplary embodiments of the present specification and is not intended to represent the only embodiment in which the technical configuration of the present specification can be implemented.

[0036] Additionally, specific terms used in the embodiments of this specification are provided to aid in understanding this specification, and the use of such specific terms may be modified in other forms without departing from the technical spirit of this specification.

[0037] The following technology can be applied to various wireless access systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access).

[0038] For the sake of clarity in the following description, the explanation is based on 3GPP communication systems (e.g., LTE, NR, etc.), but the technical concept of the present invention is not limited thereto. LTE may refer to technology from 3GPP TS 36.xxx Release 8 onwards. Specifically, LTE technology from 3GPP TS 36.xxx Release 10 onwards is referred to as LTE-A, and LTE technology from 3GPP TS 36.xxx Release 13 onwards may be referred to as LTE-A pro. 3GPP NR may refer to technology from TS 38.xxx Release 15 onwards. 3GPP 6G may refer to technology from TS Release 17 and / or Release 18 onwards. "xxx" indicates a specific standard document number. LTE / NR / 6G may be collectively referred to as 3GPP systems.

[0039] Regarding the background technology, terms, abbreviations, etc. used in this specification, reference may be made to matters described in standard documents published prior to the present invention. For example, reference may be made to standard documents 36.xxx and 38.xxx.

[0040] Communication systems applicable to the present specification

[0041] Although not limited thereto, the various descriptions, functions, procedures, proposals, methods, and / or flowcharts of operation disclosed in this specification may be applied to various fields requiring wireless communication / connection (e.g., 5G, 6G) between devices.

[0042] Examples are provided in more detail below with reference to the drawings. In the following drawings and descriptions, the same reference numerals may represent the same or corresponding hardware blocks, software blocks, or function blocks unless otherwise described.

[0043] FIG. 1 is a drawing illustrating an example of a communication system to which the present specification applies. Referring to FIG. 1, the communication system (100) to which the present specification applies includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using wireless access technology (e.g., 6G, 5G NR, LTE) and may be referred to as a communication / wireless / 5G / 6G device. Although not limited thereto, the wireless device may include a robot (100a), a vehicle (100b-1, 100b-2), an XR (extended reality) device (100c), a hand-held device (100d), a home appliance (100e), an IoT (Internet of Thing) device (100f), and an AI (artificial intelligence) device / server (100g). For example, the vehicle may include a vehicle equipped with wireless communication capabilities, an autonomous vehicle, a vehicle capable of performing inter-vehicle communication, etc. Here, the vehicle (100b-1, 100b-2) may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device (100c) includes an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) equipped in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, digital signage, a vehicle, a robot, etc. The portable device (100d) may include a smartphone, a smart pad, a wearable device (e.g., a smartwatch, smart glasses), a computer (e.g., a laptop, etc.). The home appliance (100e) may include a TV, a refrigerator, a washing machine, etc. The IoT device (100f) may include a sensor, a smart meter, etc.For example, the base station (120) and network (130) may also be implemented as wireless devices, and a specific wireless device (120a) may act as a base station / network node for other wireless devices.

[0044] Wireless devices (100a to 100f) can be connected to a network (130) through a base station (120). AI technology may be applied to the wireless devices (100a to 100f), and the wireless devices (100a to 100f) can be connected to an AI server (100g) through the network (130). The network (130) can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices (100a to 100f) may communicate with each other through the base station (120) / network (130), but they may also communicate directly (e.g., sidelink communication) without going through the base station (120) / network (130). For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (vehicle to vehicle) / V2X (vehicle to everything) communication). Also, IoT devices (100f) (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0045] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (100a~100f) / base station (120) and between base station (120) / base station (120). Here, wireless communication / connection can be established through various wireless access technologies (e.g., 5G NR), such as uplink / downlink communication (150a), sidelink communication (150b) (or D2D communication), and communication between base stations (150c) (e.g., relay, IAB (integrated access backhaul)). Through wireless communication / connection (150a, 150b, 150c), wireless devices and base stations / wireless devices, and base stations and base stations can transmit / receive wireless signals to / from each other. For example, wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, based on the various proposals of this specification, at least some of the following may be performed: a process for setting various configuration information for transmitting / receiving wireless signals, a process for various signal processing (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), a resource allocation process, etc.

[0046] Communication systems applicable to the present specification

[0047] FIG. 2 is a drawing illustrating an example of a wireless device that can be applied to the present specification.

[0048] Referring to FIG. 2, the first wireless device (200a) and the second wireless device (200b) can transmit and receive wireless signals through various wireless access technologies (e.g., LTE, NR). Here, {the first wireless device (200a), the second wireless device (200b)} may correspond to {the wireless device (100x), the base station (120)} and / or {the wireless device (100x), the wireless device (100x)} of FIG. 1.

[0049] The first wireless device (200a) includes one or more processors (202a) and one or more memories (204a), and may additionally include one or more transceivers (206a) and / or one or more antennas (208a). The processor (202a) controls the memory (204a) and / or transceivers (206a) and may be configured to implement the descriptions, functions, procedures, proposals, methods and / or sequences of operation disclosed herein. For example, the processor (202a) may process information within the memory (204a) to generate a first information / signal and then transmit a wireless signal containing the first information / signal through the transceiver (206a). Additionally, the processor (202a) may receive a wireless signal containing a second information / signal through the transceiver (206a) and then store information obtained from the signal processing of the second information / signal in the memory (204a). Memory (204a) may be connected to the processor (202a) and may store various information related to the operation of the processor (202a). For example, memory (204a) may store software code including instructions for performing some or all of the processes controlled by the processor (202a) or for performing the descriptions, functions, procedures, proposals, methods, and / or sequences of operation disclosed in this specification. Here, the processor (202a) and memory (204a) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). A transceiver (206a) may be connected to the processor (202a) and may transmit and / or receive wireless signals through one or more antennas (208a). The transceiver (206a) may include a transmitter and / or receiver. The transceiver (206a) may be combined with an RF (radio frequency) unit. In this specification, a wireless device may refer to a communication modem / circuit / chip.

[0050] The second wireless device (200b) includes one or more processors (202b) and one or more memories (204b), and may additionally include one or more transceivers (206b) and / or one or more antennas (208b). The processor (202b) controls the memory (204b) and / or transceivers (206b) and may be configured to implement the descriptions, functions, procedures, proposals, methods and / or sequences of operation disclosed herein. For example, the processor (202b) may process information within the memory (204b) to generate a third information / signal and then transmit a wireless signal containing the third information / signal through the transceiver (206b). Additionally, the processor (202b) may receive a wireless signal containing a fourth information / signal through the transceiver (206b) and then store information obtained from the signal processing of the fourth information / signal in the memory (204b). The memory (204b) may be connected to the processor (202b) and may store various information related to the operation of the processor (202b). For example, the memory (204b) may store software code including instructions for performing some or all of the processes controlled by the processor (202b) or for performing the descriptions, functions, procedures, proposals, methods, and / or sequence diagrams of operation disclosed in this specification. Here, the processor (202b) and the memory (204b) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver (206b) may be connected to the processor (202b) and may transmit and / or receive wireless signals through one or more antennas (208b). The transceiver (206b) may include a transmitter and / or receiver. The transceiver (206b) may be used in combination with an RF unit. In this specification, a wireless device may refer to a communication modem / circuit / chip.

[0051] Hereinafter, hardware elements of the wireless device (200a, 200b) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (202a, 202b). For example, one or more processors (202a, 202b) may implement one or more layers (e.g., functional layers such as PHY (physical), MAC (media access control), RLC (radio link control), PDCP (packet data convergence protocol), RRC (radio resource control), and SDAP (service data adaptation protocol). One or more processors (202a, 202b) may generate one or more PDUs (Protocol Data Units) and / or one or more SDUs (service data units) according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operation disclosed herein. One or more processors (202a, 202b) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operation disclosed in this specification. One or more processors (202a, 202b) may generate a signal (e.g., baseband signal) including a PDU, SDU, message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this specification and provide it to one or more transceivers (206a, 206b). One or more processors (202a, 202b) may receive a signal (e.g., baseband signal) from one or more transceivers (206a, 206b) and may obtain a PDU, SDU, message, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operation disclosed in this specification.

[0052] One or more processors (202a, 202b) may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more processors (202a, 202b) may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors (202a, 202b). Descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed herein may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods, and / or operation sequences disclosed in this specification may be included in one or more processors (202a, 202b) or stored in one or more memories (204a, 204b) and driven by one or more processors (202a, 202b). The descriptions, functions, procedures, proposals, methods, and / or operation sequences disclosed in this specification may be implemented using firmware or software in the form of code, instructions, and / or sets of instructions.

[0053] One or more memories (204a, 204b) may be connected to one or more processors (202a, 202b) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories (204a, 204b) may be composed of ROM (read-only memory), RAM (random access memory), EPROM (erasable programmable read-only memory), flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. One or more memories (204a, 204b) may be located inside and / or outside of one or more processors (202a, 202b). Additionally, one or more memories (204a, 204b) may be connected to one or more processors (202a, 202b) through various technologies such as wired or wireless connections.

[0054] One or more transceivers (206a, 206b) may transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or operation flowcharts, etc., of this specification to one or more other devices. One or more transceivers (206a, 206b) may receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or operation flowcharts, etc., disclosed in this specification from one or more other devices. For example, one or more transceivers (206a, 206b) may be connected to one or more processors (202a, 202b) and may transmit and receive wireless signals. For example, one or more processors (202a, 202b) may control one or more transceivers (206a, 206b) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (202a, 202b) may control one or more transceivers (206a, 206b) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (206a, 206b) may be connected to one or more antennas (208a, 208b), and one or more transceivers (206a, 206b) may be configured to transmit and receive user data, control information, wireless signals / channels, etc., as described in the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operation disclosed herein through one or more antennas (208a, 208b). In this specification, one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). One or more transceivers (206a, 206b) can convert the received wireless signal / channel, etc. from an RF band signal to a baseband signal in order to process the received user data, control information, wireless signal / channel, etc. using one or more processors (202a, 202b).One or more transceivers (206a, 206b) can convert user data, control information, wireless signals / channels, etc. processed using one or more processors (202a, 202b) from baseband signals to RF band signals. To this end, one or more transceivers (206a, 206b) may include (analog) oscillators and / or filters.

[0055] Synchronization Signal Block (SSB or SS / PBCH block)

[0056] In an NR system, PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal), and / or PBCH (Physical Broadcast Channel) can be transmitted within a single synchronization signal block (Synchronization Signal Block or Synchronization Signal PBCH block, hereinafter referred to as SS block or SS / PBCH block).

[0057] The SS / PBCH block may consist of 20 RBs within four consecutive OFDM symbols. Additionally, the SS / PBCH block is composed of PSS, SSS, and PBCH, and the terminal can perform cell search, system information acquisition, beam alignment for initial connection, DL measurement, etc. based on the SS / PBCH block.

[0058] Table 1 below is the 3GPP PBCH DM-RS Resource map table. Specifically, Table 1 below exemplifies resources within an SS / PBCH block for PSS, SSS, PBCH, and DM-RS for PBCH.

[0059]

[0060] PSS and SSS each consist of one OFDM symbol and 127 subcarriers, while PBCH consists of three OFDM symbols and 576 subcarriers. Polar coding and Quadrature Phase Shift Keying (QPSK) are applied to PBCH. Each OFDM symbol in PBCH consists of a Data RE and a Demodulation Reference Signal (DMRS) RE. There are three DMRS REs per RB, with three Data REs located between the DMRS REs. In this case, the location of the DMRS RE can be determined based on the cell ID (e.g., the mapped subcarrier index can be determined based on the N cell ID mod 4 value).

[0061] In addition, the above SS / PBCH block can be transmitted in a frequency band other than the center frequency of the frequency band used by the network.

[0062] To this end, in an NR system to which the present invention is applicable, a synchronization raster is defined as a candidate frequency location where a terminal must detect an SS / PBCH block. The synchronization raster can be distinguished from a channel raster.

[0063] The above synchronization raster may indicate the frequency location of an SS / PBCH block available for the terminal to acquire system information when there is no explicit signaling for the SS / PBCH block location. In this case, the synchronization raster may be determined based on the GSCN (Global Synchronization Channel Number). The GSCN may be transmitted via RRC signaling (e.g., MIB (Master Information Block), SIB (System Information Block), RMSI (Remaining Minimum System Information), OSI (Other System Information), etc.). Considering the complexity of initial synchronization and detection speed, such a synchronization raster is defined as longer in the frequency axis than the channel raster and has fewer blind detections.

[0064] In an NR system, a base station can transmit SS / PBCH blocks up to 64 times during a 5ms period. At this time, multiple SS / PBCH blocks are transmitted via different transmission beams, and the terminal can detect the SS / PBCH blocks by assuming that the SS / PBCH blocks are transmitted every 20ms based on a specific beam used for transmission. The maximum number of beams available for the base station to transmit SS / PBCH blocks within a 5ms time interval can be set to be larger as the frequency band increases. For example, in a band below 3GHz, the base station can transmit SS / PBCH blocks using up to 4 different beams within a 5ms time interval, up to 8 beams in a band between 3GHz and 6GHz, and up to 64 different beams in a band above 6GHz.

[0065] Synchronization procedure

[0066] The terminal can perform synchronization by receiving the SS / PBCH block as described above from the base station. At this time, the synchronization procedure largely includes a cell ID detection step and a timing detection step. Here, the cell ID detection step may include a cell ID detection step based on PSS and a cell ID detection step based on SSS (e.g., detecting one physical layer cell ID out of a total of 1008 physical layer cell IDs). Additionally, the timing detection step may include a timing detection step based on PBCH DM-RS (Demodulation Reference Signal) and a timing detection step based on PBCH content (e.g., MIB (Master Information Block)).

[0067] To this end, the terminal may assume that reception occasions for PBCH, PSS, and SSS exist on consecutive symbols. (That is, the terminal may assume that PBCH, PSS, and SSS constitute an SS / PBCH block as previously described.) Next, the terminal may assume that SSS, PBCH DM-RS, and PBCH data have the same EPRE (Energy Per Resource Element). In this case, the terminal may assume that the ratio of PSS EPRE to SSS EPRE to SSS EPRE of the corresponding SS / PBCH block within the cell is 0 dB or 3 dB. Alternatively, if dedicated higher layer parameters are not provided to the terminal, a terminal monitoring a PDCCH for DCI format 1_0, DCI format 2_7, or DCI format 4_0 having a CRC (Cyclic Redundancy Check) scrambled by SI-RNTI (System Information - Random Network Temporary Identifier), P-RNTI (Paging - Random Network Temporary Identifier), or RA-RNTI (Random Access - Random Network Temporary Identifier) ​​may assume that the ratio of PDCCH DMRS EPRE to SSS EPRE is within -8 dB to 8 dB.

[0068] First, the terminal can obtain time synchronization and the physical cell ID of the detected cell through PSS and SSS detection. More specifically, the terminal can obtain symbol timing for the SS block and detect the cell ID within the cell ID group through PSS detection. Subsequently, the terminal detects the cell ID group through SSS detection.

[0069] In addition, the terminal can detect the time index (e.g., slot boundary) of the SS block through the DM-RS of the PBCH. Subsequently, the terminal can obtain half-frame boundary information and SFN (System Frame Number) information, etc., through the MIB included in the PBCH.

[0070] At this time, the PBCH may indicate that the related (or corresponding) RMSI PDCCH / PDSCH is transmitted in the same band or a different band as the SS / PBCH block. Accordingly, after the PBCH decoding, the terminal can receive the RMSI (e.g., system information other than MIB (Master Information Block, MIB)) subsequently transmitted in the frequency band indicated by the PBCH or in the frequency band where the PBCH is transmitted.

[0071] For SS / PBCH blocks within a half-frame, the first symbol indices for candidate SS / PBCH blocks can be determined according to the subcarrier spacing of the SS / PBCH blocks as follows. In this case, index #0 corresponds to the first symbol of the first slot within the half-frame.

[0072] (Case A: 15 kHz subcarrier spacing) The first symbols of candidate SS / PBCH blocks can have {2, 8} + 14*n symbols. For non-shared spectrum channel access, n takes a value of 0 or 1 for frequency bands below 3 GHz. For frequency bands between 3 GHz and 6 GHz, n takes a value of 0, 1, 2, or 3.

[0073] (Case A: 15 kHz subcarrier spacing) The first symbols of candidate SS / PBCH blocks can have {2, 8} + 14*n symbols. For non-shared spectrum channel access, n takes a value of 0 or 1 for frequency bands below 3 GHz. For frequency bands between 3 GHz and 6 GHz, n takes a value of 0, 1, 2, or 3.

[0074] (Case B: 30 kHz subcarrier spacing) The first symbols of candidate SS / PBCH blocks can have {4, 8, 16, 32} + 28*n symbols. For frequency bands below 3 GHz, n takes a value of 0. For frequency bands between 3 GHz and 6 GHz, n takes a value of 0 or 1.

[0075] (Case C: 30 kHz subcarrier spacing) The first symbols of candidate SS / PBCH blocks can have {2, 8} + 14*n symbols. If it is not shared spectrum channel access and is a paired spectrum operation, n takes a value of 0 or 1 for frequency bands below 3 GHz. For frequency bands between 3 GHz and 6 GHz, n takes a value of 0, 1, 2, or 3. If it is an unpaired spectrum operation, n takes a value of 0 or 1 for frequency bands below 1.88 GHz. For frequency bands between 1.88 GHz and 6 GHz, n takes a value of 0, 1, 2, or 3.

[0076] (Case D: 120 kHz subcarrier spacing) The first symbols of the candidate SS / PBCH blocks can have {4, 8, 16, 20} + 28*n symbols. For frequency bands above 6 GHz, n takes values ​​of 0, 1, 2, 3, 5, 6, 7, 8, 19, 11, 12, 13, 15, 16, 17, or 18.

[0077] (Case E: 240 kHz subcarrier spacing) The first symbols of the candidate SS / PBCH blocks can have {8, 12, 16, 20, 32, 36, 40, 44} + 56*n symbols. For frequency bands above 6 GHz, n takes values ​​of 0, 1, 2, 3, 5, 6, 7, or 8.

[0078] (Case F: 480 kHz subcarrier spacing) The first symbols of the candidate SS / PBCH blocks can have {2, 9} + 14*n symbols. For the FR 2-2 frequency band, n has values ​​of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, or 31.

[0079] (Case F: 960 kHz subcarrier spacing) The first symbols of the candidate SS / PBCH blocks can have {2, 9} + 14*n symbols. For the FR 2-2 frequency band, n has values ​​of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, or 31.

[0080] In relation to the above operation, the terminal can obtain system information.

[0081] The MIB contains information / parameters for monitoring the PDCCH that schedules the PDSCH carrying SIB1 (System Information Block 1), and is transmitted to the terminal by the base station via the PBCH within the SS / PBCH block.

[0082] The terminal can check based on the MIB whether a CORESET (Control Resource Set) exists for the Type0-PDCCH common search space. The Type0-PDCCH common search space is a type of PDCCH search space and is used to transmit PDCCHs that schedule SI messages.

[0083] If a Type0-PDCCH common search space exists, the terminal can determine (i) a plurality of contiguous resource blocks and one or more consecutive symbols constituting a CORESET and (ii) a PDCCH occasion (e.g., a time domain location for receiving a PDCCH) based on information within the MIB (e.g., pdcch-ConfigSIB1).

[0084] If a Type0-PDCCH common search space does not exist, pdcch-ConfigSIB1 provides information regarding the frequency locations where SSB / SIB1 exists and the frequency ranges where SSB / SIB1 does not exist.

[0085] SIB1 contains information related to the availability and scheduling (e.g., transmission period, SI-window size) of the remaining SIBs (hereinafter SIBx, where x is an integer of 2 or more). For example, SIB1 may indicate whether SIBx is broadcast periodically or provided on-demand (or upon a request from a terminal). If SIBx is provided on-demand, SIB1 may contain information necessary for the terminal to perform an SI request. SIB1 is transmitted via PDSCH, the PDCCH scheduling SIB1 is transmitted via the Type0-PDCCH common seek space, and SIB1 is transmitted via the PDSCH directed by said PDCCH.

[0086] RSSI measurement

[0087] The terminal may measure and report the following RSRP, RSRQ, and RSSI for handover, etc.

[0088] The following provides a detailed explanation of SS-RSRQ and RSSI.

[0089] SS reference signal received quality (SS-RSRQ)

[0090] Below, we examine matters related to the definition of SS-RSRQ.

[0091] Secondary synchronization signal reference signal received quality (SS-RSRQ) is defined as the ratio of N^SS-RSRP / NR carrier RSSI, where N is the number of resource blocks within the NR carrier RSSI measurement bandwidth. Measurements of the numerator and denominator must be performed on the same set of resource blocks.

[0092] The NR carrier Received Signal Strength Indicator (NR carrier RSSI) consists of the linear average of the total received power (unit: [W]) observed only at a specific OFDM symbol among the measurement time resource(s) within the measurement bandwidth, across N resource blocks from all sources including co-channel serving and non-serving cells, adjacent channel interference, thermal noise, etc. For cell selection according to Section 4.1 of TS 38.133

[0012] , the measurement time resource(s) for the NR carrier RSSI are not limited. In other cases, the measurement time resources for NR carrier RSSI are limited to the window duration of the SS / PBCH Block Measurement Time Configuration (SMTC).

[0093] If indicated by higher layers, if the measurement gap is not used, the NR carrier RSSI is measured in the slots within the SMTC window period indicated by the higher layer parameter measurementSlots and in the OFDM symbols given in Table 5.1.3-1; if the measurement gap is used, the NR carrier RSSI is measured in the slots within the SMTC window period indicated by the higher layer parameter measurementSlots and in the OFDM symbols given in Table 5.1.3-1 that overlap with the measurement gap defined in TS38.133

[0012] .

[0094] For intra-frequency measurements, the NR carrier RSSI is measured using a timing reference corresponding to the serving cell of the corresponding frequency layer.

[0095] For inter-frequency measurements, the NR carrier RSSI is measured using a timing reference corresponding to any cell of the target frequency layer.

[0096] Unless otherwise instructed by the upper layer, if the measurement gap is not used, the NR carrier RSSI is measured in OFDM symbols within the SMTC window period, and if the measurement gap is used, the NR carrier RSSI is measured in OFDM symbols corresponding to the overlapping time span between the SMTC window period and the measurement gap.

[0097] Table 2 below shows examples of NR carrier RSSI measurement symbols.

[0098]

[0099] If the upper layer directs a specific SS / PBCH block to perform the SS-RSRQ measurement, the SS-RSRP is measured only on the directed set of SS / PBCH blocks.

[0100] For frequency range 1, the reference point for SS-RSRQ must be the antenna connector of the terminal (UE). For frequency range 2, the NR carrier RSSI must be measured based on the combined signal from the antenna elements corresponding to a given receiver branch, wherein the combination for the NR carrier RSSI must be the same as that used for the SS-RSRP measurement. For frequency ranges 1 and 2, if the terminal is using receiver diversity, the reported SS-RSRQ value must not be lower than any of the corresponding SS-RSRQs of the individual receiver branches.

[0101] SS-RSRQ is applicable to the following states.

[0102] RRC Idle Intra-Frequency (RRC_IDLE intra-frequency)

[0103] RRC Idle Inter-Frequency (RRC_IDLE inter-frequency)

[0104] RRC Inactive Intra-Frequency (RRC_INACTIVE intra-frequency)

[0105] RRC inactive inter-frequency

[0106] RRC connected intra-frequency

[0107] RRC connection status between frequencies (RRC_CONNECTED inter-frequency)

[0108] Received Signal Strength Indicator (RSSI)

[0109] Below, we examine matters related to the definition of RSSI.

[0110] The Received Signal Strength Indicator (RSSI) consists of the linear average of the total received power (unit: [W]) observed by the terminal (UE) from all sources, including co-channel serving and non-serving cells, adjacent channel interference, thermal noise, etc., for each configured OFDM symbol and only within the measurement bandwidth corresponding to the defined channel bandwidth. Here, the channel has a center frequency set by ARFCN-valueNR.

[0111] The higher layers set the ARFCN-valueNR, reference numerology, and measurement duration, that is, which OFDM symbol(s) the terminal needs to measure.

[0112] For frequency range 1, the reference point for RSSI must be the antenna connector of the terminal (UE). If the terminal is using receiver diversity, the reported RSSI value must not be lower than any of the corresponding RSSIs of the individual receiver branches.

[0113] RSSI is applicable to the following conditions.

[0114] RRC connected intra-frequency

[0115] RRC connection status between frequencies (RRC_CONNECTED inter-frequency)

[0116] The symbols / abbreviations / terms used in this specification are as follows.

[0117] PDCCH: Physical Downlink Control CHannel

[0118] DCI: Downlink Control Information

[0119] PDSCH: Physical Downlink Shared CHannel

[0120] PUSCH: Physical Uplink Shared CHannel

[0121] CSI: Channel state information

[0122] RRM: Radio resource management

[0123] SCS: Sub-carrier spacing

[0124] RLM: Radio link monitoring

[0125] DCI: Downlink Control Information

[0126] TBS: Transport Block Size

[0127] TDRA: Time Domain Resource Allocation

[0128] SSB: Synchronization Signal Block

[0129] RSRP: Reference Signal Received Power

[0130] RSRQ: Reference Signal Received Quality

[0131] RSSI: Received Signal Strength Indicator

[0132] PBCH: Physical broadcast channel

[0133] PSS: Primary synchronization signal

[0134] SSS: Secondary synchronization signal

[0135] PSCell: Primary Secondary cell

[0136] PCell: Primary cell

[0137] LNA: Low Noise Amplifier

[0138] TRS: Tracking Reference Signal

[0139] FDM: Frequency Division Multiplexing

[0140] EIRP : Equivalent Isotropic Radiated Power

[0141] RE: Resource-element

[0142] CORESET: CONtrol Resource SET

[0143] SIB1: System Information Block Type1

[0144] SNR: Signal Noise Ratio

[0145] SINR: Signal to Interference plus Noise Ratio

[0146] FFT: Fast Fourier Transform

[0147] In 6G, newly discovered frequencies ranging from 7GHz to 24GHz are scheduled to be supported in addition to the frequency bands used in 5G. These bands are higher frequency than the bands primarily used in 5G (below 7GHz). While high-frequency bands offer the advantage of higher transmission speeds due to a wider available bandwidth for communication, they tend to result in higher path loss depending on the transmission and reception distance. Higher path loss leads to the disadvantage of a narrower coverage area for base stations (assuming the same base station EIRP). Furthermore, the coverage range of communication networks is expanding from terrestrial to non-terrestrial, and there is an increasing number of cases where non-terrestrial base stations or repeaters are installed on satellites and high-altitude relay platforms. Additionally, network architectures for IoT support wider coverage areas than eMBB-supported architectures. In such environments, path loss increases as the distance between the base station / repeater and the terminal increases.

[0148] Conventional methods to address path loss include using high-output antennas, multiple array antennas, and allocating significant resources. However, the use of high-output antennas requires consideration of implementation difficulties and electromagnetic regulations. Deploying multiple array antennas at the transmitter and receiver ends has the disadvantage of requiring the use of multiple beams to achieve high antenna gain. Another approach involves improving reception performance by allocating significant resources (frequency and / or time) to a given channel; however, since SSBs are transmitted periodically from the base station, resource efficiency decreases, and base station power consumption increases due to the maintenance of periodic transmission. To resolve path loss, a solution is required that efficiently utilizes frequency and time resources without increasing the number of base station / terminal operational beams, while minimizing implementation complexity for both the base station and the terminal.

[0149] This specification proposes a resource allocation method that enhances base station operational flexibility, improves performance, and lowers implementation complexity through an SSB resource selective iteration structure, and a technique that reduces SSB receiver complexity.

[0150] This specification proposes a new SSB structure as a method to expand the base station coverage area. The new SSB structure enhances reception performance through selective repeated transmission. In the case of periodic SSB repeated transmission, Power and frequency / time resources may be wasted when the base station coverage area is narrow. This specification proposes a technique for selecting the number of SSB repetitions to suit base station operation. Base stations in narrow areas can select a structure without repeated transmissions, while base stations supporting wide areas can select a structure with a high number of repetitions. Since the initial connected terminal does not know the base station's repetition count, it must receive the base station signal through a blind detection method. The terminal must attempt reception assuming that the base station transmits at the maximum number of repetitions. The terminal must attempt reception by assuming the maximum number of transmissions (N SSB_rep_maxUsing ) 0,1,.. N SSB_rep_max (or 0,1,.. N SSB_rep_max -1) Reception can be attempted with each retransmission possibility. For example, N SSB_rep_max can be interpreted as the maximum number of retransmissions, and N SSB_rep_max =0 may mean the case where there is no retransmission (the case where the SSB is transmitted only once). In this case, N SSB_rep can be interpreted as the number of retransmissions (e.g., if the SSB is transmitted 3 times, N SSB_rep =2). For example, N SSB_rep_max can be interpreted as the maximum number of transmissions, and N SSB_rep_max =1 may mean the case where there is no retransmission (the case where the SSB is transmitted only once). In this case, N SSB_rep can be interpreted as the number of transmissions (e.g., if SSB is transmitted 3 times, N SSB_rep =3). For the convenience of explanation below, N SSB_rep_max This is explained by assuming that is the maximum number of retransmissions.

[0151] The value of the (actual) number of retransmissions used by the base station (N SSB_rep ) is instructed to the terminal based on downlink signals / channels such as PBCH payload, DCI, or SIB1. The terminal N SSB_rep From the time the value is received, the reception operation can be performed according to the number of base station retransmissions. In this specification, the maximum number of retransmissions (N SSB_rep_max ) is defined in advance, and the number of retransmissions (N) is adjusted according to the situation of each base station. SSB_rep The method of determining ) is referred to as selective retransmission. In selective retransmission, once the number of retransmissions is determined, SSBs are assigned to consecutive positions. Consecutive assignment means the continuity of each transmittable interval (it does not necessarily mean that OFDM symbols are consecutive). Each transmittable interval can be predefined in the frame structure. The number of retransmissions (N) between a base station and an adjacent base station SSB_rep) can be set differently. The number of retransmissions (N) of the neighbor cell to measure the quality of the neighbor cell through the communication process between the terminal and the connected line Serving Cell. SSB_rep The value must be passed via PDSCH.

[0152] N SSB_rep_max It can be set to a value related to the carrier frequency as a fixed value for the base station carrier frequency value.

[0153] According to one embodiment, N is divided into sections according to the carrier frequency band. SSB_rep_max The value of can be set / defined. Specifically, N SSB_rep_max It can be set / defined as follows. For 1GHz or less, N SSB_rep_max is set / defined to 0, and N for 3GHz or less SSB_rep_max is set / defined to 1, and N for 6GHz or lower SSB_rep_max can be set / defined to 3. And for 6GHz or higher, N SSB_rep_max It can be set / defined to 7.

[0154] According to one embodiment, N SSB_rep_max It can be set / defined per NR operation band. For example, for band n1, N SSB_rep_max is set / defined to 1, and for n=5, N SSB_rep_max is set / defined to 0, and for n79, N SSB_rep_max can be set / defined to 3. And for n257, N SSB_rep_max It can be set / defined to 7.

[0155] According to one embodiment, N based on SSB SCS (SubCarrier Spacing) SSB_rep_max can be set / defined. This embodiment takes into account that SCS is a value set by the base station operating area and operating frequency. As a specific example, for SCS 15KHz, N SSB_rep_maxis set / defined to 0, and for 30KHz, N SSB_rep_max is set / defined to 1, and for 120KHz, N SSB_rep_max can be set / defined to 3. And for 240KHz, N SSB_rep_max It can be set / defined to 7.

[0156] OFDM symbols within the proposed SSB structure may be discontinuous. To reduce implementation complexity at the terminal, the placement of OFDM symbols may be predetermined or defined. When using Normal CP in the NR standard, the length varies depending on the Symbol index, so the position must be determined by the OFDM Symbol index.

[0157] The following explanation refers to FIGS. 3 and FIGS. 4.

[0158] FIG. 3 illustrates an SSB structure according to a conventional method. Specifically, FIG. 3 shows an NR SSB structure. Referring to FIG. 3, the NR SSB includes PSS, SSS, and PBCH.

[0159] FIG. 4 illustrates a repeating structure of an SSB according to an embodiment of the present specification. To support SSB repetition, a method of repeatedly transmitting the entire NR SSB may be considered. Referring to FIG. 4, each repeated SSB can be distinguished as follows. SSB0 represents the first transmission, SSB1 represents the second transmission (first repeated transmission), and SSB2 represents the third transmission (second repeated transmission). FIG. 4 shows a maximum number of transmissions 4 (maximum number of repetitions is 3, N SSB_rep_max This shows an example where =3). The base station sets the value within the maximum number of retransmissions to N. SSB_rep It can be set / applied. This value may vary depending on the base station implementation. SSB i is PSS i ,SSS i and PBCH i Includes

[0160] Below, we examine four methods related to selective iteration methods. Specifically, i) a PSS sequence generation method, ii) an SSS sequence generation method, iii) a DM-RS generation method for PBCH, and iv) a PBCH generation method are described below in order. Each of the above-described methods can be applied individually to terminal / base station operations, and two or more methods may be combined and applied to terminal / base station operations.

[0161] Method 1) PSS Sequence Generation Method

[0162] NR PSS is used for initial synchronization. With respect to optional repetition in this specification, since the terminal does not know the number of repetitions, PSS i All possibilities regarding this must be considered. The correlator used by the receiver assumes that synchronization using PSS has occurred when a reception quality signal above a certain level is detected. The terminal performs SSS and PBCH detection after PSS detection. In this specification, PSS i PSS to ensure reception performance of each correlator for iThe sequence must possess excellent auto-correlation and cross-correlation performance. Zadoff-Chu sequences, m-sequences, and chirp sequences can be used as PSS sequences. When using Zadoff-Chu sequences, different root indices may be used. When using m-sequences, different cyclic shift values ​​may be used or applied. In the case of chirp sequences, support is possible through up chirp / down chirp and resources in the frequency domain. For the convenience of explanation below, an m-sequence is assumed to be the PSS sequence. A PSS sequence using an m-sequence in NR can be generated based on Equations 1 through 3 below.

[0163]

[0164]

[0165]

[0166]

[0167] As described above, a PSS sequence of length 127 is generated. Specifically, sequences from x (7) to x (126) are generated using the initial value of Equation 3 and Equation 2. Among the sequence of length 127 generated from Equation 2, Cell ID 2( Using ), three sequences are generated by applying a cyclic shift in units of 43. A new sequence is required for each repetition per cell. New sequences can be generated by changing the cyclic shift value. New PSS i Sequence is Trunc(43 / ( N SSB_rep_maxIt is created and used with the cyclic shift interval established in +1). Trunc() is a function that truncates the decimal part. N SSB_rep_max When =3, the sequence(d) with a new cyclic shift applied in units of 10. PSSi ) can be made. Mathematical formula 4 is N in an m-sequence of length 127 in this specification. SSB_rep_max This is an example where =3. As another example, it is also possible to increase the length of the m-sequence.

[0168] Each base station is an SSBi (i: repetition index, i=0.. N SSB_rep ) N according to the size of its support area SSB_rep Values ​​0, 1, 2 .. N SSB_rep_max Set to the value inside (N SSB_rep <=N SSB_rep_max ). The terminal is N according to the specifications SSB_rep_max The value is known, but N SSB_rep Since the value is unknown, it can be received using a blind detection method. The method for detecting PSS in the selective repeat transmission of SSB can be implemented in two different ways, and in this specification, N SSB_rep_max Explained as the case where ==3.

[0169] FIG. 5 illustrates an example of a transmitter according to an embodiment of the present specification. Referring to FIG. 5, this transmitter structure can be applied to the PSS detection method described below. This transmitter is implemented based on NR m-sequence. An m-sequence generator block generates a sequence of length 127. In the cyclic shift block, the result of the "m-sequence generator" is cyclically shifted using the Cell ID and Repetition Index. Symbol mapping is performed on this value, and then an inverse FFT is performed in the iFFT block. For the input to the iFFT, the m-sequence value with the cyclic shift applied is applied to the central 127 resource element, and zero values ​​are applied elsewhere. Finally, a CP (cyclic prefix) is added, and then transmission takes place. Since the PSS OFDM symbol is usually FDMed with other base station channels, a combining section is added before the transmitting antenna.

[0170] According to the first method, the PSS receiving correlator N in the time domain SSB_rep_max + 1 is placed, and the number of retransmissions is calculated using the result of each correlator. This will be explained below with reference to FIGS. 6 and FIGS. 7.

[0171] FIG. 6 illustrates an example of a receiver according to an embodiment of the present specification. Referring to FIG. 6, in the Repetition Detector 0, each correlator (PSS i The number of retransmissions is detected using time and quality information obtained from the correlator. For example, PSS i The reception quality is PSS i It can be determined / defined based on the reception quality of the correlator. For example, PSSi The reception quality is PSS i It can be determined / defined based on the reception quality from the correlator to the PSS0 correlator.

[0172] FIG. 7 is a flowchart illustrating an example of a method for detecting the number of transmissions according to an embodiment of the present specification. Specifically, FIG. 7 shows a flowchart for a detection operation performed within Repetition Detector 0. The terminal (receiver) assumes maximum transmission and detects when the reception quality indicator / reception performance indicator exceeds a specific threshold starting from the last PSS3. Referring to FIG. 7, the comparison order is the maximum value of the repetition index (N SSB_rep_max Proceed in descending order from =3)(N SSB_rep =3 -> N SSB_rep =2 -> N SSB_rep =1 -> N SSB_rep =0). At this time, the number of detected retransmissions is N SSB_rep It is defined as `. More specifically, based on S710 to S740, the number of retransmissions (N) is as follows. SSB_rep `) can be detected.

[0173] In S710, if the PSS3 reception performance indicator (reception quality) is greater than Threshold 3, N SSB_rep is determined to be 3. Otherwise, S720 is performed.

[0174] In S720, if the PSS2 reception performance indicator (reception quality) is greater than Threshold 2, N SSB_rep is determined to be 2. Otherwise, S730 is performed.

[0175] In S730, if the PSS1 reception performance indicator (reception quality) is greater than Threshold 1, N SSB_rep is determined to be 1. Otherwise, S740 is performed.

[0176] In S740, if the PSS0 reception performance indicator (reception quality) is greater than Threshold 0, N SSB_rep is determined to be 0. Otherwise, it is determined / considered as PSS not found.

[0177] The terminal (e.g., SSS receiver) obtains cell id2 from Repetition Detector 0 ( ), reception time information and N SSB_rep The cell ID is calculated from the received signal based on `. The terminal (e.g., PBCH receiver) obtains the cell ID, PSS reception time information, and N SSB_rep PBCH decoding is performed based on `. If PBCH decoding is received successfully (CRC check passed), the terminal then N through signaling. SSB_rep You must receive and use it. In other words, the N detected by the receiver SSB_rep `(=Number of retransmissions determined by the terminal(N SSB_rep `)) is N received via Signaling SSB_rep (=N number of retransmissions used by the base station SSB_rep ) may differ. Therefore, additional information needs to be conveyed in a subsequent step. For example, the base station is N based on i) PBCH, ii) DCI for SIB1, or iii) SIB1. SSB_rep can be set / instructed to the terminal. As a specific example, the terminal can set / instruct the determined number of retransmissions (N SSB_rep N set / instructed based on one of i) to iii) above when receiving SSBs again after receiving SSBs based on `) SSB_rep Based on, SSBs can be received / measured. The terminal is N SSB_rep When performing a measure after receiving SSBs based on `, (set / instructed) N SSB_repBased on this, reception quality can be calculated using all transmitted signals. This method offers excellent reception performance but requires multiple PSS correlators. A second method can be considered in terms of improving implementation complexity.

[0178] According to the second method, one PSS receiving correlator (PSS0 correlator) is utilized in the time domain. Since this correlator does not know the time information, it operates during the SSB period. At this time, the PSS0 sent by the base station is utilized. This will be explained with reference to Figures 8 and 9.

[0179] FIG. 8 illustrates another example of a receiver according to an embodiment of the present specification. Referring to FIG. 8, Repetition Detector 1 uses time information obtained from a correlator and a received signal to determine the PSS0~PSS of retransmissionable positions. SSB_rep_max Calculates the reception quality. This operation can be performed in both the time domain and the frequency domain using time information obtained from the PSS0 correlator. Since the correlator in Repetition Detector 1 knows the time information, which is the result of the PSS0 correlator, it is performed once within the SSB period.

[0180] FIG. 9 is a flowchart illustrating another example of a transmission count detection method according to an embodiment of the present specification. Specifically, FIG. 9 shows a flowchart for a detection operation performed within Repetition Detector 1. According to the second method, a detection operation is performed when the reception quality indicator / reception performance indicator of the PSS0 correlator is greater than or equal to a specific Threshold 2. If it is less than that, it is processed as PSS not detected (PSS not found). The terminal (receiver) assumes maximum transmission and the last PSS SSB_rep_maxDetection occurs when the reception quality indicator is greater than or equal to a specific Threshold2. Referring to Fig. 9, the comparison order proceeds in descending order from the maximum repetition index value (N SSB_rep =3 -> N SSB_rep =2 -> N SSB_rep =1 -> N SSB_rep =0). Threshold1 is used for the reception quality indicator / reception performance indicator used at this time. For example, it can be assumed that Threshold2 < Threshold1. In other words, a Threshold1 greater than Threshold2 can be used. At this time, the detection of the detected number of retransmissions is N SSB_rep It is defined as `. More specifically, based on S910 to S950, the number of retransmissions (N) is as follows. SSB_rep `) can be detected.

[0181] In S910, if the PSS0 reception performance indicator (reception quality) is greater than Threshold 2, S920 is performed. Otherwise, it is determined / considered as PSS not found.

[0182] In S920, if the PSS3 reception performance indicator (reception quality) is greater than Threshold 1, N SSB_rep is determined to be 3. Otherwise, S930 is performed.

[0183] In S930, if the PSS2 reception performance indicator (reception quality) is greater than Threshold 1, N SSB_rep is determined to be 2. Otherwise, S940 is performed.

[0184] In S940, if the PSS1 reception performance indicator (reception quality) is greater than Threshold 1, N SSB_rep is determined to be 1. Otherwise, S950 is performed.

[0185] In S950, if the PSS0 reception performance indicator (reception quality) is greater than Threshold 1, N SSB_repis determined to be 0. Otherwise, it is determined / considered as PSS not found.

[0186] Since the correlator within Repetition Detector 1 can operate in the frequency domain, performance can be enhanced by performing the PSS0 correlator one more time. The terminal (e.g., SSS receiver) obtains cell id2, reception time information, and N obtained from Repetition Detector 1. SSB_rep The cell ID is calculated from the received signal based on `. The terminal (e.g., PBCH receiver) obtains the cell ID, PSS reception time information, and N SSB_rep PBCH decoding is performed based on `. If PBCH decoding is received successfully (CRC check passed), the terminal then N through signaling. SSB_rep You must receive and use it. In other words, the N detected by the receiver SSB_rep `(=Number of retransmissions determined by the terminal(N SSB_rep `)) is N received via Signaling SSB_rep (=N number of retransmissions used by the base station SSB_rep ) may differ. Therefore, additional information needs to be conveyed in a subsequent step. For example, the base station is N based on i) PBCH, ii) DCI for SIB1, or iii) SIB1. SSB_rep can be set / instructed to the terminal. As a specific example, the terminal can set / instruct the determined number of retransmissions (N SSB_rep N set / instructed based on one of i) to iii) above when receiving SSBs again after receiving SSBs based on `) SSB_rep Based on, SSBs can be received / measured. The terminal is N SSB_rep When performing a measure after receiving SSBs based on `, (set / instructed) N SSB_repBased on this, reception quality can be calculated using all transmitted signals. This method has the characteristic of low receiver complexity because only one PSS reception correlator is required. Reception performance is also excellent in fading environments because Repetition Detector 1 can calculate reception quality in the frequency domain by applying different values ​​for Threshold 1 and Threshold 2.

[0187] Method 2) Method for generating an SSS sequence

[0188] As a method for generating an SSS sequence, i) using the same sequence between repeating SSSs and ii) using the same sequence between repeating SSSs may be considered. For the repetition of SSS, it is advantageous to use different sequences to compensate for errors or for cross-verification during the PSS detection process. An m-sequence or a gold sequence may be used as the SSS sequence. When using an m-sequence, a repetition index may be applied to the cyclic shift value. In the following examples, an NR gold sequence was used as the SSS sequence. An SSS sequence using a gold sequence in NR can be generated based on the following Equations 5 to 7.

[0189]

[0190]

[0191]

[0192]

[0193] As described above, an SSS sequence of length 127 is generated. Specifically, using the initial value of Equation 7 and Equation 6, sequences from x0 (7) to x0 (126) and from x1 (7) to x1 (126) are generated. Among the sequence of length 127 generated from Equation 6, Cell ID1 ( ) and Cell ID 2( A sequence with a cyclic shift applied using ) is used. A new sequence is required for each repetition per cell. A new sequence can be generated by changing the value of the cyclic shift. For example, a new sequence according to an embodiment of this specification can be generated based on Equation 8. d i, SSS Frequency domain SSS after modulation using i A sequence is generated. A new SSS i m for Sequence generation i,0 and m i,1 The repetition index i is used. In this case, the initial value is m i,0 [m0(6)쪋m0(0)] is used, and m i,1 [m1(6) ��m1(0)] is used. For example, the repetition index can be used as the initial value for the gold sequence in Equation 7. Using the MSB and LSB of the repetition index, m i,0 wa m i,1 It can be used as the initial value of.

[0194] Method 3) Method for generating DM-RS for PBCH

[0195] The base station is each SSB i (i=0.. N SSB_rep ) My PBCH i Based on this, different data can be transmitted. The base station N depending on the size of its support area. SSB_rep Values ​​0, 1, 2 .. N SSB_rep_maxSet to the value inside (N SSB_rep <=N SSB_rep_max Methods for generating DM-RS for PBCH include DM-RS resource mapping and sequence generation methods.

[0196] Method 3-1) DM-RS Resource Mapping Method for PBCH

[0197] For DM-RS resource mapping methods, i) a method of assigning to the same location between repeating PBCHs and ii) a method of assigning to different locations between repeating PBCHs may be considered. Since the operating range required for an SSB receiver is the low SNR / SINR range, a method with excellent reception performance in a frequency-selective channel environment is required. In this specification, DM-RS is defined as repeating PSS i It proposes a method to allocate the liver to a different location.

[0198]

[0199]

[0200] Equation 9 represents ν for calculating the DM-RS position in the NR standard. Equation 9 is cell id( It represents a function that takes ) as an argument. According to an embodiment of the present specification, ν can be calculated based on the value of i, which is the repetition index. This can be expressed mathematically as Equation 10 above. Since one SCS moves in each repeated DM-RS for PBCH, the performance in the frequency-selective channel is excellent.

[0201] Method 3-2) Method for generating DM-RS sequences for PBCH

[0202] For DM-RS sequence generation methods, i) using the same sequence between repeating PBCHs and ii) using different sequences between repeating PBCHs may be considered. For DM-RS sequences for PBCHs, it is advantageous to use different sequences to compensate for errors or for cross-verification during the PSS detection process. This specification proposes two methods for generating different sequences. The first method utilizes a single sequence, and the second method uses the repetition index as the initial value for sequence generation.

[0203]

[0204]

[0205]

[0206]

[0207]

[0208] Mathematical formulas 11 and 12 are formulas for generating the DM-RS sequence in the NR standard.

[0209] According to the first method, a sequence is generated based on a combination of mathematical equations 12 and 13. Specifically, after a sequence is generated, it is divided and used in each iterative transmission section. i In (m), i is the repetition index.

[0210] The second method utilizes the repetition index in the initial value for sequence generation. In this second method, Equations 14 and 15 are used. The range LSB2–LSB6 of the initial value for NR sequence generation is used for the repetition index value. Since the maximum allowed number of cases is 16, a repetition index modulus of 16 is used as the initial value. c i,init sequence c based on i is created and the corresponding c i Based on r i (m) is generated. In another embodiment, an OFDM symbol index (OFDM symbol number) may be used instead of a Repetition index.

[0211] Method 4) PBCH generation method

[0212] The base station is each SSB i (i=0.. N SSB_rep ) My PBCH i It can transmit different data. Depending on the size of its support area, the base station N SSB_rep Values ​​0, 1, 2 .. N SSB_rep_max Set to the value inside (N SSB_rep <=N SSB_rep_max ). If each repeating PBCH i If the same data is used repeatedly, performance degradation may occur. This will be explained in detail below with reference to Fig. 10.

[0213] FIG. 10 illustrates operations related to PBCH generation according to an embodiment of the present specification. Specifically, FIG. 10 illustrates the results of operations performed sequentially after PBCH payload generation. FIG. 10 A) illustrates the result of using the same rate matching for each iteration. FIG. 10 B) illustrates the result of using the rate matching method proposed according to an embodiment of the present specification.

[0214] Referring to FIG. 10, a 512-bit codeword (or sequence) is generated by performing PBCH channel coding. Specifically, the result / output according to channel coding is a 512-bit bit sequence (d0~d 511 ) is (1010). More specifically, in channel coding (polar coding), the number of bits N after channel coding is 2 n is. In the case of PBCH, n is assumed to be 9. Accordingly, N=2 9 Since = 512, the bit sequence d0~d after channel coding N-1 is d0~d 511 It can be expressed as such. Subsequently, an 864-bit sequence is generated by performing PBCH NR rate matching based on the sequence. Rate matching is performed in the following three steps.

[0215] [1] Sub-block interleaving

[0216] [2] Bit selection

[0217] [2] Interleaving of coded bits

[0218] The result of sub-block interleaving is fixed at 512, the same as the coding codeword length. In other words, the result / output from sub-block interleaving is a 512-bit bit sequence (y0~y 511 )is(1020).

[0219] The bit selection result in the PBCH is generated in a repetition manner using the sub-block interleaving result. To explain in more detail, the rate matching output sequence length (E=864) is the input bit sequence (y0~y) for rate matching. 511 Since it is greater than or equal to the length of ) (N=512) (E≥N), among the operations related to bit selection for rate matching (e.g., repetition, puncturing, shortening), bit selection based on repetition is performed. The rate matching output sequence is e k Let k=0..E-1. The output sequence according to the existing method is e k =y mod(k,N) It is defined as such. The resulting PBCH bit selection result is as follows (refer to the Normal Tx portion of 1031 in Fig. 10).

[0220] [1] e0~e 511 -> ymod(0,512)~ymod(511,512) ->y 0~ y 511

[0221] [2] e 512 ~e 863 -> ymod(512,512)~ymod(863,512) ->y 0~ y 351

[0222] Accordingly, y0~y in the result of the sub-block interleaving performed thereafter 351 This is included 2 times, and y 352 ~y 511 This is included once. It may be assumed that the optional retransmission (SSB repeated transmission) proposed in this specification is performed based on the rate matching operation according to the existing method described above. As an example, SSB iPBCH i For this purpose, if the same bit selection as the existing method described above is performed, only the beginning part of the result of sub-block interleaving is repeated many times. Specifically, referring to 1031 in Fig. 10, N SSB_rep When =1 (when SSB is transmitted a total of 2 times), y0~y 351 is transmitted 4 times, and y 352 ~y 511 It is transmitted twice.

[0223] In this specification, after 864 bits are selected / determined in bit selection, processing is not performed starting from the first bit (y0) of the input bit sequence, but rather from the bits according to the start offset (e.g., y 0+offset A method for processing from ) is proposed. The starting offset can be calculated based on the following mathematical formula 16.

[0224]

[0225] Referring to the result (1032) based on the proposed method, the offset applied during the second transmission is 352 (=864*1 mod 512), so the 353rd bit (y 352 Selected starting from ). Finally, y0~ y 191 Up to 3 times, y 192 ~y 511 Up to this point, it is repeated twice to improve performance. For example, if a start offset is applied to the definition of the rate matching output sequence according to the existing method described above, the rate matching output sequence is e k It can be expressed as =ymod(k+offset,N). Referring to Fig. 10, the rate matching output sequence can be expressed as follows.

[0226] Normal Tx part of 1032

[0227] [1] e0~e 511 - >ymod(0+864*0mod512(=0),512) ~ymod(511+864*0mod512(=0),512) ->y 0~ y 511

[0228] [2] e 512 ~e 863 -> ymod(512+864*0mod512(=0),512) ~ymod(863+864*0mod512(=0),512) ->y 0~ y 351

[0229] Part 1 of 1032 Repetition

[0230] [1] e0~e 159 -> ymod(0+864*1mod512(=352),512) ~ymod(159+864*1mod512(=352),512) ->y 352~ y 511

[0231] [2] e 160 ~e 671 -> ymod(160+864*1mod512(=352),512) ~ymod(671+864*1mod512(=352),512) ->y 0~ y 511

[0232] [3] e 672 ~e 863 -> ymod(672+864*1mod512(=352),512) ~ymod(863+864*1mod512(=352),512) ->y 0~ y 191

[0233] The following effects are derived from the embodiments described above. Base station operational flexibility can be increased through the selective iteration structure of the SSB. Reception performance can be improved and terminal implementation complexity can be reduced by applying the proposed generation and reception methods.

[0234] In a first aspect of the present specification, a method is provided that is performed by a terminal (or a first node) in a wireless communication system, comprising the step of performing an operation described in the present specification.

[0235] In a second aspect of the present specification, a terminal (or first node) of a wireless communication system is provided, comprising: at least one transceiver; at least one processor configured to perform the operation described in the present specification; and at least one computer memory operably connected to the at least one processor.

[0236] In a third aspect of the present specification, an apparatus is provided comprising at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that cause a terminal (or first node) to perform the operation described in the present specification based on execution by the at least one processor.

[0237] In a fourth aspect of the present specification, a non-transitory computer-readable storage medium is provided that stores instructions for a terminal (or first node) to perform the operation described in the present specification, based on execution by at least one processor.

[0238] In a fifth aspect of the present specification, a method is provided in which a base station (or second node) in a wireless communication system performs a method comprising the step of performing an operation described in the present specification.

[0239] In a sixth aspect of the present specification, a base station (or second node) of a wireless communication system is provided, comprising: at least one transceiver; at least one processor configured to perform the operation described in the present specification; and at least one computer memory operably connected to the at least one processor.

[0240] In a seventh aspect of the present specification, an apparatus is provided comprising at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that cause a base station (or a second node) to perform the operation described in the present specification based on execution by the at least one processor.

[0241] In the eighth aspect of the present specification, a non-transient computer-readable storage medium is provided for storing instructions that cause a base station (or a second node) to perform the operation described in the present specification, based on execution by at least one processor.

[0242] Herein, the operations described in this specification may be described separately for convenience, but unless specifically stated otherwise, each operation may be combined with others.

[0243] In terms of implementation, operations according to the embodiments described above can be processed by the device of FIGS. 1 and FIGS. 2 described above (e.g., the processor (202a, 202b) of FIGS. 2).

[0244] In addition, the operations according to the above-described embodiments may be stored in memory (e.g., 204a, 204b of FIG. 2) in the form of instructions / programs (e.g., instructions, executable code) for driving at least one processor (e.g., processor (202a, 202b) of FIG. 2).

[0245] The embodiments described above will be explained in detail below with reference to FIGS. 11 and FIGS. 12 in terms of the operation of the terminal and base station. The methods described below are divided only for convenience of explanation, and it is obvious that a part of one method may be substituted with a part of another method or combined with one another and applied.

[0246] FIG. 11 is a flowchart illustrating a method according to one embodiment of the present specification.

[0247] Referring to FIG. 11, a method according to one embodiment of the present specification includes an SS / PBCH block reception step (S1110).

[0248] In S1110, the terminal receives a Synchronization Signal / Physical Broadcast Channel Block (SS / PBCH block) from the base station.

[0249] According to one embodiment, the SS / PBCH block may be received based on a number of repetitions determined from among the number of repetitions based on the maximum number of repetitions. The maximum number of repetitions may be defined based on the frequency band. This embodiment may be based on at least one of the above-described methods 1 to 4.

[0250] According to one embodiment, the number of repetitions may be determined based on a comparison of reception quality values ​​of Primary Synchronization Signals (PSS) calculated based on the maximum number of repetitions with one or more threshold values. This embodiment may be based on a retransmission count detection method (first method or second method) according to Method 1). The maximum number of repetitions is the N described above. SSB_rep_max It can be based on, and the number of repetitions is the aforementioned N SSB_rep It can be based on `

[0251] For example, each of the above reception quality values ​​may be associated with a different number of iterations. The above reception quality values ​​may be calculated based on correlation values ​​associated with the above PSSs (e.g., result values ​​based on PSS0-correlator to PSS3-correlator). The above one or more threshold values ​​may include a threshold value for each of the above reception quality values. The number of iterations may be determined by comparing each reception quality value with a threshold value in order from the PSS associated with the highest number of iterations (e.g., PSS3) to the PSS associated with the lowest number of iterations (e.g., PSS0). The present embodiment may be based on the embodiment related to FIG. 7.

[0252] For example, the reception quality values ​​may be calculated based on a correlation value (e.g., a result value based on the PSS0 correlator) associated with the first PSS (e.g., PSS0) among the PSSs. The one or more threshold values ​​may include i) a first threshold value (e.g., Threshold1) and ii) a second threshold value (e.g., Threshold2) that is smaller than the first threshold value. Based on the fact that the reception quality value of the PSS associated with the lowest number of repetitions among the PSSs is greater than or equal to the second threshold value, the number of repetitions may be determined by comparing each reception quality value with the first threshold value in order from the PSS associated with the highest number of repetitions to the PSS associated with the lowest number of repetitions among the PSSs. This embodiment may be based on the embodiment related to FIG. 9.

[0253] According to one embodiment, the Physical Broadcast Channel (PBCH) within the SS / PBCH block may be based on an output bit sequence after rate matching. This embodiment may be based on Method 4).

[0254] More specifically, in the case of rate matching for a polar code, bit selection based on repetition is performed when E≥N, and bit selection based on puncturing or shortening is performed otherwise. In the case of this embodiment, bit selection based on repetition is performed based on the offset described above. This will be explained in detail below.

[0255] For example, bit selection associated with the output bit sequence may be performed based on repetition. The output sequence associated with the bit selection may be generated based on i) a rate matching output sequence length (e.g., E), ii) the length of the bit sequence after sub-block interleaving (e.g., N), and iii) an offset associated with the number of repetitions.

[0256] As a specific example, the output sequence related to the bit selection can be generated based on the following mathematical formula.

[0257] [Mathematical Formula]

[0258]

[0259] Here, k is an index from 0 to E-1, E is the length of the rate-matching output sequence, and N may be the length of the bit sequence after sub-block interleaving. The bit sequence after sub-block interleaving is from Bits up to (e.g., of Fig. 10) It can be based on ). can represent a modulo operation. may be the offset related to the number of repetitions above.

[0260] At this time, the above offset can be determined based on the mathematical formula offset = E*imodN. i may be an index based on the number of iterations. As a specific example of E≥N, E may be 864 and N may be 512. To explain in more detail, based on the fact that E is 864 and N is 512, the above offset can be determined based on the following mathematical formula.

[0261] [Mathematical Formula]

[0262] offset=864i mod 512

[0263] Here, i may be an index based on the number of iterations. The mod may represent a modulo operation (e.g., a mod b represents the remainder when a is divided by b). As a specific example, assuming the number of iterations is 4, the SS / PBCH block may be interpreted as being transmitted 5 times (initial transmission + 4 iterations). The index i associated with the first SS / PBCH block may be 0, and the index i associated with the fifth SS / PBCH block may be 4.

[0264] According to one embodiment, the method may further include the step of receiving information related to the number of repetitions. Specifically, the terminal may receive information related to the number of repetitions from a base station. The number of repetitions (e.g., the above-described N SSB_rep `) is the number of repetitions indicated based on the above information (e.g., N SSB_repIt can be updated to ). This embodiment may be based on signaling related to the additional information transmission of Method 1). More specifically, the number of iterations determined by the terminal and the number of iterations used by the base station may differ. The update operation is intended to resolve the discrepancy between the number of iterations assumed by the terminal and the number of iterations used by the base station. For example, the information may be received based on i) a Physical Broadcast Channel (PBCH), ii) Downlink Control Information (DCI) (e.g., DCI related to the scheduling of SIB1), or iii) a System Information Block (SIB) (e.g., SIB1).

[0265] The operation based on the information reception step related to the above-described S1110 and the number of repetitions can be implemented by the device of FIG. 2. For example, one or more transceivers (206a or 206b) and / or one or more memories (204a or 204b) can be controlled so that the terminal (200a or 200b) performs the operation based on the information reception step related to S1110 and the number of repetitions.

[0266] The information transmission step related to S1210 and the number of repetitions in FIG. 12 described below corresponds to the information reception step related to S1110 and the number of repetitions in FIG. 11. Considering the above correspondence, redundant descriptions are omitted. That is, the specific description of the base station operation described below can be replaced by the description / embodiment of FIG. 11 corresponding to the operation.

[0267] FIG. 12 is a flowchart illustrating a method according to another embodiment of the present specification.

[0268] Referring to FIG. 12, a method according to another embodiment of the present specification includes an SS / PBCH block transmission step (S1210).

[0269] In S1210, the base station transmits a Synchronization Signal / Physical Broadcast Channel Block (SS / PBCH block) to the terminal. The SS / PBCH block may be transmitted based on the number of repetitions among the repetitions based on the maximum number of repetitions. The maximum number of repetitions may be defined based on the frequency band. For example, the maximum number of repetitions is the above-mentioned N SSB_rep_max It can be based on, and the number of repetitions is the aforementioned N SSB_rep It can be based on.

[0270] According to one embodiment, the method may further include the step of transmitting information related to the number of repetitions. Specifically, a base station may transmit information related to the number of repetitions to a terminal. The number of repetitions determined by the terminal (e.g., the above-described N SSB_rep `) is the number of repetitions indicated based on the above information (e.g., N SSB_rep It can be updated to ). This embodiment may be based on signaling related to the additional information transmission of method 1). For example, the information may be transmitted based on i) a Physical Broadcast Channel (PBCH), ii) Downlink Control Information (DCI) (e.g., DCI related to the scheduling of SIB1), or iii) a System Information Block (SIB) (e.g., SIB1).

[0271] An operation based on the information transmission step related to the above-described S1210 and the number of repetitions can be implemented by the device of FIG. 2. For example, a base station (200a or 200b) may control one or more transceivers (206a or 206b) and / or one or more memories (204a or 204b) to perform an operation based on the information transmission step related to S1210 and the number of repetitions.

[0272] Here, the wireless communication technology implemented in the wireless devices (200a, 200b) of this specification may include LTE, NR, and 6G, as well as Narrowband Internet of Things for low-power communication. For example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology and may be implemented according to standards such as LTE Cat NB1 and / or LTE Cat NB2, but is not limited to the names mentioned above. Additionally, or generally, the wireless communication technology implemented in the wireless devices (200a, 200b) of this specification may perform communication based on LTE-M technology. For example, LTE-M technology may be an example of LPWAN technology and may be referred to by various names such as eMTC (enhanced Machine Type Communication). For example, LTE-M technology may be implemented in at least one of various standards such as 1) LTE CAT 0, 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, and is not limited to the names mentioned above. Additionally or generally, wireless communication technology implemented in the wireless devices (200a, 200b) of this specification may include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) for low-power communication, and is not limited to the names mentioned above. As an example, ZigBee technology can create personal area networks (PANs) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and may be referred to by various names.

[0273] The embodiments described above are combinations of the components and features of this specification in a specific form. Each component or feature should be considered optional unless otherwise explicitly stated. Each component or feature may be implemented in a form not combined with other components or features. Additionally, it is possible to construct embodiments of this specification by combining some components and / or features. The order of operations described in the embodiments of this specification may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment. It is obvious that embodiments may be constructed by combining claims that do not have an explicit citation relationship in the claims, or that they may be included as new claims through amendments made after filing.

[0274] Embodiments according to the present specification may be implemented by various means, e.g., hardware, firmware, software, or a combination thereof. In the case of implementation by hardware, an embodiment of the present invention may be implemented by one or more ASICs (application specific integrated circuits), DSPs (digital signal processors), DSPDs (digital signal processing devices), PLDs (programmable logic devices), FPGAs (field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, etc.

[0275] In the case of implementation by firmware or software, an embodiment of the present specification may be implemented in the form of a module, procedure, function, etc., that performs the functions or operations described above. The software code may be stored in memory and executed by a processor. The memory may be located inside or outside the processor and may exchange data with the processor by various known means.

[0276] It is obvious to those skilled in the art that this specification may be embodied in other specific forms without departing from the essential features of this specification. Accordingly, the detailed description set forth above should not be interpreted restrictively in all respects but should be considered illustrative. The scope of this specification shall be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of this specification are included within the scope of this specification.

Claims

In terms of method, The method includes the step of receiving a Synchronization Signal / Physical Broadcast Channel Block (SS / PBCH block); The above SS / PBCH block is received based on a number of repetitions determined from among the number of repetitions based on the maximum number of repetitions, and A method characterized in that the maximum number of repetitions is defined based on the frequency band. In Article 1, A method characterized in that the number of repetitions is determined based on the comparison of reception quality values ​​of primary synchronization signals (PSS) calculated based on the maximum number of repetitions and one or more threshold values. In Article 2, A method characterized in that each of the above reception quality values ​​is associated with a different number of repetitions. In Paragraph 3, The above reception quality values ​​are calculated based on correlation values ​​related to the above PSSs, and The above one or more thresholds include a threshold for each of the above reception quality values, A method characterized by determining the number of repetitions by comparing each reception quality value and threshold value in order from the PSS associated with the highest number of repetitions among the above PSSs to the PSS associated with the lowest number of repetitions. In Article 2, The above reception quality values ​​are calculated based on the correlation value associated with the first PSS among the above PSSs, and The above one or more threshold values ​​include i) a first threshold value and ii) a second threshold value smaller than the first threshold value, and Based on the fact that the reception quality value of the PSS associated with the lowest number of iterations among the above PSSs is greater than or equal to the second threshold: A method characterized by determining the number of repetitions by comparing each reception quality value with the first threshold value in order from the PSS associated with the highest number of repetitions among the above PSSs to the PSS associated with the lowest number of repetitions. In Article 1, The physical broadcast channel (PBCH) within the above SS / PBCH block is based on the output bit sequence after rate matching, and Bit selection related to the above output bit sequence is performed based on repetition, and A method characterized in that the output sequence related to the bit selection above is generated based on i) rate matching output sequence length, ii) the length of the bit sequence after sub-block interleaving, and iii) an offset related to the number of repetitions. In Article 6, The output sequence associated with the above bit selection is generated based on the following mathematical formula, and [Mathematical Formula] Here, k is an index from 0 to E-1, E is the length of the rate matching output sequence, N is the length of the bit sequence after sub-block interleaving, and the bit sequence after sub-block interleaving is from Based on the beats up to, represents a modulo operation, and A method characterized by the fact that is the offset related to the number of repetitions. In Article 7, Based on the fact that E is 864 and N is 512, the offset is determined based on the following mathematical formula, and [Mathematical Formula] A method characterized in that, where i is an index based on the number of iterations, and mod represents a modulo operation. In Article 1, The method further includes the step of receiving information related to the number of repetitions mentioned above, wherein A method characterized in that the number of repetitions is updated to the number of repetitions indicated based on the information. In Article 9, A method characterized by receiving the above information based on i) a Physical Broadcast Channel (PBCH), ii) Downlink Control Information (DCI), or iii) a System Information Block (SIB). In the terminal, One or more transmitters and receivers; One or more processors; and It includes one or more memories connected to the above one or more processors and storing instructions, A terminal characterized by the above instructions enabling the terminal to perform all steps of the method according to any one of claims 1 to 10, based on execution by the one or more processors. In a device comprising one or more memories and one or more processors connected to the one or more memories, An apparatus characterized in that the above one or more memories store instructions that cause a terminal to perform all steps of a method according to any one of claims 1 to 10, based on execution by the above one or more processors. In a non-transient computer-readable storage medium for storing instructions, A non-transient computer-readable storage medium characterized by instructions executed by one or more processors such that the terminal performs all steps of the method according to any one of claims 1 to 10. In terms of method, The method includes the step of transmitting a Synchronization Signal / Physical Broadcast Channel Block (SS / PBCH block), wherein The above SS / PBCH block is transmitted based on the number of repetitions among the number of repetitions based on the maximum number of repetitions, and A method characterized in that the maximum number of repetitions is defined based on the frequency band. In the case of a base station, One or more transmitters and receivers; One or more processors; and It includes one or more memories connected to the above one or more processors and storing instructions, A base station characterized by the above instructions, based on execution by one or more processors, having the base station perform all steps of the method according to claim 14.

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