Method and device for transmitting and receiving signals in wireless communication system

Abstract

A method and a device for transmitting and receiving signals in a wireless communication system are disclosed in the present specification, wherein, when an SSB is transmitted and received between a base station and a terminal, second SSBs added as needed may be transmitted and received in addition to a first SSB that is configured by default.

Description

Method and device for transmitting and receiving signals in a wireless communication system

[0001] The present invention relates to a method and apparatus used in a wireless communication system.

[0002] Wireless communication systems are widely deployed to provide various types of communication services, such as voice and data. Typically, wireless communication systems are multiple access systems that support communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power). Examples of multiple access systems include Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA).

[0003] The technical problem to be achieved by the present invention is to provide a method for efficiently transmitting and receiving wireless communication signals and a device therefor.

[0004] The technical problems of the present invention are not limited to the technical problems described above, and other technical problems can be inferred from the embodiments of the present invention.

[0005] The present invention provides a method and device for transmitting and receiving signals in a wireless communication system.

[0006] As one aspect of the present invention, a method performed by a terminal in a wireless communication system is provided, comprising: receiving a first configuration for a first SSB (synchronization signal / physical broadcast channel block) having a specific period; and receiving the first SSB based on the specific period; wherein, based on the reception of a second configuration for a second SSB having a second period, one or more second SSBs are additionally received between the specific periods.

[0007] As another aspect of the present invention, a device for performing the above method is provided, comprising a terminal, a processor, and a storage medium.

[0008] In another aspect of the present invention, a method performed by a base station in a wireless communication system is provided, comprising: transmitting a first configuration for a first SSB having a specific period; and transmitting the first SSB based on the specific period; wherein, based on the transmission of a second configuration for a second SSB having a second period, one or more second SSBs are additionally transmitted between the specific periods.

[0009] As another aspect of the present invention, a device for performing the method is provided, comprising a base station, a processor, and a storage medium.

[0010] The above devices may include at least a terminal, a network, and an autonomous vehicle capable of communicating with other autonomous vehicles other than the above devices.

[0011] The above-described aspects of the present invention are only some of the preferred embodiments of the present invention, and various embodiments reflecting the technical features of the present invention can be derived and understood by a person having ordinary skill in the art based on the detailed description of the present invention described below.

[0012] According to one embodiment of the present invention, when a signal is transmitted and received between communication devices, there is an advantage in that more efficient signal transmission and reception can be performed through operations differentiated from those of the prior art.

[0013] The technical effects of the present invention are not limited to the technical effects described above, and other technical effects can be inferred from the embodiments of the present invention.

[0014] Figure 1 illustrates the structure of a radio frame.

[0015] Figure 2 illustrates a resource grid of slots.

[0016] Figure 3 illustrates the SSB structure.

[0017] Figures 4 to 6 are drawings for explaining a signal transmission and reception method according to an embodiment of the present invention.

[0018] Figures 7 to 10 illustrate devices according to embodiments of the present invention.

[0019] The following technologies can be used in various wireless access systems, such as CDMA, FDMA, TDMA, OFDMA, and SC-FDMA. CDMA can be implemented using wireless technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented using wireless technologies such as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented using wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA). UTRA is a part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A (Advanced) / LTE-A pro is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0020] For clarity, the description is based on a 3GPP communication system (e.g., LTE, NR), but the technical idea of ​​the present invention is not limited thereto. LTE refers to technology after 3GPP TS 36.xxx Release 8. Specifically, LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro. 3GPP NR refers to technology after TS 38.xxx Release 15. LTE / NR may be referred to as a 3GPP system. "xxx" refers to a standard document detail number. LTE / NR may be collectively referred to as a 3GPP system. For background technology, terms, abbreviations, etc. used in the description of the present invention, reference may be made to matters described in standard documents published prior to the present invention. For example, reference may be made to the following documents.

[0021] 3GPP NR

[0022] - 38.211: Physical channels and modulation

[0023] - 38.212: Multiplexing and channel coding

[0024] - 38.213: Physical layer procedures for control

[0025] - 38.214: Physical layer procedures for data

[0026] - 38.300: NR and NG-RAN Overall Description

[0027] - 38.331: Radio Resource Control (RRC) protocol specification

[0028] Figure 1 illustrates the structure of a radio frame used in NR.

[0029] In NR, uplink (UL) and downlink (DL) transmissions are structured as frames. A radio frame is 10ms long and is defined as two 5ms half-frames (HF). Each half-frame is defined as five 1ms subframes (SF). A subframe is divided into one or more slots, and the number of slots in a subframe depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM(A) symbols, depending on the cyclic prefix (CP). When normal CP is used, each slot contains 14 symbols. When extended CP is used, each slot contains 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or DFT-s-OFDM symbols).

[0030] Table 1 illustrates that when CP is normally used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0031] [Table 1]

[0032]

[0033] Table 2 illustrates that when extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0034] [Table 2]

[0035]

[0036] In an NR system, OFDM(A) numerology (e.g., SCS, CP length, etc.) may be set differently between multiple cells that are merged into a single user equipment (UE). Accordingly, the (absolute time) interval of a time resource (e.g., SF, slot, or TTI) (conveniently referred to as a TU (Time Unit)) consisting of the same number of symbols may be set differently between the merged cells.

[0037] NR supports multiple Orthogonal Frequency Division Multiplexing (OFDM) numerologies (e.g., subcarrier spacing, SCS) to support various 5G services. For example, a 15 kHz SCS supports wide areas in traditional cellular bands, while a 30 kHz / 60 kHz SCS can support dense urban areas, lower latency, and wider carrier bandwidth.

[0038] The NR frequency band is defined by two types of frequency ranges (FR) (FR1 / FR2). FR1 / FR2 can be configured as shown in Table 3 below. FR2 can also refer to millimeter wave (mmW).

[0039] [Table 3]

[0040]

[0041] Figure 2 illustrates the slot structure of an NR frame.

[0042] A slot contains multiple symbols in the time domain. For example, for a normal CP, one slot contains 14 symbols, and for an extended CP, one slot contains 12 symbols. A carrier contains multiple subcarriers in the frequency domain. An RB (Resource Block) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. Multiple RB interlaces (simply, interlaces) can be defined in the frequency domain. An interlace m ∈ {0, 1, ..., M-1} can be composed of (common) RBs {m, M+m, 2M+m, 3M+m, ...}. M represents the number of interlaces. A BWP (Bandwidth Part) is defined as multiple consecutive RBs (e.g., physical RBs, PRBs) in the frequency domain, and can correspond to one OFDM numerology (e.g., SCS(u), CP length, etc.). A carrier can contain up to N (e.g., 5) BWPs. Data communication is performed through activated BWPs, and only one BWP can be activated for a single terminal within a single cell / carrier. Each element in the resource grid is referred to as a Resource Element (RE), to which a single modulation symbol can be mapped.

[0043] In a wireless communication system, a terminal receives information from a base station via the downlink (DL), and the terminal transmits information to the base station via the uplink (UL). The information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels / signals exist depending on the type / purpose of the information they transmit and receive. A physical channel corresponds to a set of resource elements (REs) that carry information derived from a higher layer. A physical signal corresponds to a set of resource elements (REs) used by the physical layer (PHY), but does not carry information derived from a higher layer. The higher layers include the Medium Access Control (MAC) layer, the Radio Link Control (RLC) layer, the Packet Data Convergence Protocol (PDCP) layer, and the Radio Resource Control (RRC) layer.

[0044] DL physical channels include Physical Broadcast Channel (PBCH), Physical Downlink Shared Channel (PDSCH), and Physical Downlink Control Channel (PDCCH). DL physical signals include DL Reference Signal (RS), Primary Synchronization Signal (PSS), and Secondary Synchronization Signal (SSS). DL RS includes Demodulation RS (DM-RS), Phase-tracking RS (PT-RS), and Channel-state information RS (CSI-RS). UL physical channels include Physical Random Access Channel (PRACH), Physical Uplink Shared Channel (PUSCH), and Physical Uplink Control Channel (PUCCH). UL physical signals include UL RS. UL RS includes DM-RS, PT-RS, and Sounding RS (SRS).

[0045] In the present invention, the base station may be, for example, a gNodeB.

[0046] Figure 3 illustrates the SSB structure. Based on SSB, a terminal can perform cell search, system information acquisition, beam alignment for initial access, and DL measurements. SSB is used interchangeably with the SS / PBCH (Synchronization Signal / Physical Broadcast channel) block.

[0047] Referring to Figure 3, SSB is composed of PSS, SSS, and PBCH. SSB is composed of four consecutive OFDM symbols, and PSS, PBCH, SSS / PBCH, and PBCH are transmitted for each OFDM symbol. PSS and SSS are each composed of one OFDM symbol and 127 subcarriers, and PBCH is composed of three OFDM symbols and 576 subcarriers. Polar coding and QPSK (Quadrature Phase Shift Keying) are applied to PBCH. PBCH is composed of data RE and DMRS (Demodulation Reference Signal) RE for each OFDM symbol. There are three DMRS REs for each RB, and three data REs exist between DMRS REs.

[0048] NES (Network energy saving)

[0049] The contents discussed above can be applied in combination with the methods proposed in the present invention described below, or can be supplemented to clarify the technical features of the methods proposed in the present invention.

[0050] In addition, the methods described below can be equally applied to the NR system (licensed band) or shared spectrum described above, and the technical ideas proposed in this specification can be modified or replaced to fit the terms, expressions, structures, etc. defined in each system so that they can be implemented in the corresponding systems.

[0051] As higher data rates are demanded, base stations must be equipped with more antennas and provide services across wider bandwidths and frequency bands. Recent studies indicate that base station energy costs can reach as high as 20% of total operational expenditure (OPEX). To build eco-friendly networks by reducing carbon emissions and lowering operating expenses (OPEX) for telecommunications operators, energy conservation at base stations is a key consideration in wireless communication systems, including 3GPP.

[0052] This increased interest in base station energy savings led to the approval of a new study item in 3GPP NR release 18 called “study on network energy savings”, and the technologies specified in subsequent work items included SSB-less S-Cell operation for inter-band CA of FR1 and co-located cells, improvements to the Cell DTX / DRX mechanism including alignment of Cell DTX / DRX and UE DRX in RRC_CONNECTED mode, and inter-node information exchange of Cell DTX / DRX. It also includes spatial domain and power domain techniques that enable efficient adaptation of spatial elements, efficient adaptation of power values ​​between PDSCH and CSI-RS, mechanisms to prevent camping of legacy UEs in cells adopting Rel-18 NES technology, improvements to CHO procedures, inter-node beam activation and improvements to limit paging in limited areas, and corresponding RRM / RF core requirements.

[0053] Meanwhile, there are other technologies that have been identified as useful through research but are not yet specified in Rel-18. Rel-19 WI aims to adopt additional technologies that can achieve network energy savings, targeting beneficial techniques studied but not yet adopted in Rel-18, such as on-demand SSB and on-demand SIB1 transmission, and adaptation of common signaling / channel transmission.

[0054] Base stations can achieve energy saving (ES) through symbol muting when there is no data to transmit. However, common signals and channels such as SSB or SIB (system information block) are always-on signals / channels, making it difficult to achieve ES through symbol muting in these symbols. In NR, SSB / SIB can be transmitted by using specific subcarrier spacing (SCS) and beam sweeping using multiple beams for each FR (frequency range). In this case, the number of beams increases as the FR increases. Therefore, the amount of time resources used for transmitting common signals / channels such as SSB / SIB1 in FR2 becomes relatively larger than in FR1, which can also increase the proportion of the energy consumption of the base station. To reduce the energy consumed by transmitting always-on signals such as SSB / SIB, the SSB / SIB period can be set to a long period. However, problems such as the time it takes for a terminal to connect to a cell may increase and existing terminals not being able to properly discover the cell may occur.

[0055] Therefore, in this specification, we propose methods for saving energy of a base station by adjusting the period, etc. on the time axis for SSB among common signals / channels.

[0056] [Method #1] A method of controlling the cycle of an SSB burst by dynamically indicating a specific SSB burst cycle through (group-common) DCI (downlink control information) or MAC-CE (medium access control-control element) by setting one or more SSB burst or SSB burst set cycle candidates to the terminal in advance.

[0057] Figure 4 illustrates an SSB burst. An SSB burst is composed of a set of SSBs, and each SSB within the SSB burst can be transmitted through a different beam. This is to beam-sweep the PSS / SSS and PBCH to transmit them in different beam directions. An SSB burst can be composed of one or more SSBs. The SSBs within the SSB burst are transmitted using time-division multiplexing (TDM). An SSB burst is always confined within a 5ms window and is located in the first half or the second half of a 10ms radio frame. The base station can set the SSB period to one of {5ms, 10ms, 20ms, 40ms, 80ms, 160ms} through the RRC parameter (ssb-PeriodicityServingCell) in SIB1. The maximum number of SSBs in an SSB burst, Lmax, can be Lmax = 4 / 8 / 64 depending on the carrier frequency / band.

[0058] In addition to the SSB cycle configured via SIB1, a connected mode terminal can be configured with an SSB cycle via a UE-specific RRC parameter. To save energy at the base station, the terminal can be configured with one or more SSB burst cycle candidates, and the SSB burst cycle can be quickly (relatively quickly compared to RRC reconfiguration) indicated via (group-common) DCI or MAC-CE, taking into account the cell situation (e.g., load / number of connected mode terminals / traffic in a specific beam direction, etc.). For example, if a terminal is configured with four SSB burst cycles, such as {80ms, 160ms, 320ms, 640ms}, one of the four SSB cycle candidates can be dynamically indicated via a 2-bit field in the GC (group-common)-DCI (00 for 80ms, 01 for 160ms, etc.) The MO of GC-DCI or MAC-CE to control the period / pattern of the SSB index or SSB index group can be set to N times the SSB period or 5ms (N is a natural number greater than 1).

[0059] The application time of the indicated new SSB cycle may be a time point previously set by the base station or a time point predefined in the standard. Alternatively, the application time of the new SSB cycle may be directly indicated by GC-DCI or MAC-CE. For example, if GC-DCI is received at a pre-set GC-DCI MO (monitoring occasion), the newly indicated SSB burst cycle may be applied 20ms after that time point. Alternatively, similar to the SI (system information) modification period, if a change in the SSB burst cycle is indicated within a specific window, the terminal may maintain the existing cycle during that window and apply the new SSB burst cycle from the beginning of the next window. In cases where the application time point is directly indicated by GC-DCI or MAC-CE, the index of one of multiple pre-set application time candidates may be indicated.

[0060] When a change in the period of an SSB burst is instructed through GC-DCI or MAC-CE, the terminal can assume the SSB burst period of the changed period within the current window (or from the current window). In this case, the terminal can assume reception based on the changed period only for SSB bursts transmitted after the time at which the terminal received the instruction, even within the current window. If the position of the SSB burst due to the changed period does not include (all) the positions of the SSB bursts before the period was changed, the terminal can assume both the SSB bursts before and after the period was changed and attempt to receive SSB at least within the current window. In addition, if the number of consecutive windows is instructed by the base station, the length of the section to which the SSB of the changed period is applied can be dynamically instructed.

[0061] [Method #2] A method of dynamically controlling the period of transmitted SSB by dynamically indicating a specific period / pattern through (group-common) DCI or MAC-CE in a state where multiple transmission periods / patterns are set in units of SSB index or SSB index group on the time axis.

[0062] Within an SSB burst, multiple SSBs can be configured in TDM mode. Each SSB within an SSB burst can be transmitted along a different index / beam. Within an SSB burst, SSBs with different SSB indices can be transmitted in different beam directions. Therefore, when there is little data activity in a specific beam direction or a small number of connected mode terminals, the base station can save energy by adjusting the SSB index or the period of the SSB group corresponding to the beam direction to a longer period.

[0063] A terminal can receive an SSB index group configured in advance by a base station, which groups multiple SSB indexes. Different periods / patterns can be configured for each SSB index or SSB index group. At this time, multiple period / pattern candidates can be configured for each SSB index or SSB index group. Depending on the situation in the cell, one of the period / pattern candidates configured in advance for each SSB index or SSB index group can be dynamically indicated by the base station through a (group) bitmap in GC-DCI or MAC-CE. The MO of GC-DCI or MAC-CE for controlling the period / pattern of an SSB index or SSB index group can be configured as N times the SSB period or 5ms (N is a natural number greater than 1).

[0064] For example, two SSB index groups #0 and #1 may be set within an SSB burst, and four period candidates may be set, such as {80ms, 160ms, 320ms, 640ms}. In this case, a 4-bit bitmap corresponding to each SSB index group may be included in the GC-DCI. The first two bits of the four bits may dynamically indicate the period of SSB index group #0, and the remaining two bits may dynamically indicate the period of SSB index group #1.

[0065] When multiple patterns are set for each SSB index or SSB index group, each pattern may be related to whether or not the SSB index or SSB index group is transmitted within the SSB burst according to the period, and may have a non-uniform (non-periodic) transmission pattern on the time axis. For example, each SSB index or SSB index group may have a specific transmission pattern within a separate period / window. In one pattern setting, transmission patterns for multiple SSB indexes or SSB index groups may be included. For example, pattern setting #0 may include a specific transmission pattern for SSB index groups #0 and #1, and pattern setting #1 may include a transmission pattern for SSB index groups #0 and #1 that is different from pattern setting #0.

[0066] The application time of the indicated new period / pattern may be a time point previously set by the base station or a time point defined in the standard. Alternatively, the application time of the new SSB period may be directly indicated by GC-DCI or MAC-CE. For example, the period of the newly indicated SSB index or SSB index group may be applied 160 ms after the time point when the GC-DCI is received. Alternatively, similar to the SI modification period, if a change in period / pattern is indicated within a specific window, the terminal may maintain the existing period / pattern during that window and apply the new period / pattern from the start of the next window. In cases where the application time point is directly indicated through GC-DCI or MAC-CE, one index among multiple pre-configured application time candidates may be indicated.

[0067] When a change in the period of an SSB index or an SSB index group is instructed through GC-DCI or MAC-CE, the terminal can assume the period of the SSB index or SSB index group of the changed period within the current window (or from the current window). In this case, the terminal can assume reception based on the changed period only for the SSB index or SSB index group transmitted after the time at which the terminal received the instruction, even within the current window. If the position of the SSB index or SSB index group due to the changed period does not include (all) the positions of the SSB index or SSB index group before the period was changed, the terminal can assume both the SSB index or SSB index group before and after the period was changed, and attempt to receive SSB, at least within the current window. In addition, if the number of consecutive windows is instructed by the base station, the length of the period to which the SSB of the changed period is applied may be dynamically instructed.

[0068] Meanwhile, when the period of the SSB burst / SSB index / SSB index group is dynamically adapted in the above methods #1 and #2, a method may be required to guarantee reception of SSB for existing terminals (which may refer to terminals that do not support the R19 NES feature) at a preset default period. For example, if the period of the default SSB (burst) is 80ms and it is instructed to dynamically change the period to 40ms, it may be desirable for the SSB transmission of the 40ms period to include the transmission position of the default SSB. For example, if the default SSB period is to transmit SSBs at 0 / 80 / 160ms, when the period is changed to 40ms, the transmission positions of the SSBs may be changed to 0 / 40 / 80 / 120 / 160ms, not 20 / 60 / 100ms. The default SSB period may be determined as the maximum value among the period candidates set for the terminal, or may be separately set by the base station. The SSB-to-RO mapping determined by the default SSB position of 0 / 80 / 160ms may not be affected even if RO (random access channel occasion) is placed at 0 / 40 / 80 / 120 / 160ms cycles by SSB adaptation.

[0069] [Method #3] A method to dynamically indicate information about the SSB (AT-SSB) actually transmitted within an SSB burst through a (group-common) DCI or (group) bitmap in MAC-CE.

[0070] The terminal can set / receive information about the AT-SSB where the SSB is actually transmitted among candidate locations where the SSB can be transmitted within the SSB burst for the purpose of rate-matching from the base station through SIB1 or terminal-specific RRC signaling. For the band below 6 GHz (or below), the information about the AT-SSB can be indicated with a full bitmap consisting of up to 8 bits. For the band above 6 GHz (or above), the information about the AT-SSB can be indicated with a group bitmap (8 bits) and a bitmap in group (8 bits). Fig. 5 shows examples of a group bitmap and a bitmap in group. A full bitmap of up to 64 bits can be set through terminal-specific RRC signaling. Since the existing AT-SSB setting / instruction method is relatively quasi-static, a method of more dynamically setting / instructing AT-SSB to the terminal through (GC-)DCI or MAC-CE may be considered to save energy at the base station.

[0071] Similar to the existing one, for the band below 6GHz, a full bitmap consisting of up to 8 bits may be included in GC-DCI or MAC-CE, and for the band above 6GHz, a group bitmap (8 bits) and an intra-group bitmap (8 bits) may be included in GC-DCI or MAC-CE. However, in this case, the overhead may be too large, so one bit in the bitmap may indicate a pre-configured SSB index group unit or slot unit SSB. In this case, the (group) bitmap may be in the form of indicating one of the indexes when multiple bitmap candidates (group bitmap or full bitmap in SIB1) are set in advance by the base station. The MO of GC-DCI or MAC-CE for dynamically indicating AT-SSB can be set to N times the SSB period or 5ms (N is a natural number greater than 1).

[0072] Similar to (de)activation via DCI format 2_9 of R-18 NES cell DTX / DRX configuration, each bit / bit group constituting the (group) bitmap in (GC-)DCI or MAC-CE can be associated with each of multiple cells configured for the UE. Through the bit / bit group associated with each cell, AT-SSB can be indicated in units of SSB index groups or slots. Alternatively, one of multiple pre-agreed bitmap candidates can be indicated through the bit / bit group associated with each cell. When four SSBs of SSB index 0, 2, 4, and 6 among eight SSBs are indicated through the bitmap in (GC-)DCI or MAC-CE, the UE can be configured / instructed in advance whether the SSBs of SSB index 1, 3, 5, and 7 are transmitted consecutively on the time axis or whether non-consecutive SSBs are transmitted excluding the SSBs of SSB index 0, 2, 4, and 6.

[0073] Meanwhile, the application time and the length of the time period (timer / duration) of the AT-SSB indicated by GC-DCI or MAC-CE may be preset (defined in the standard) or may be dynamically indicated by one of multiple preset candidates. The application time and the time period of the AT-SSB may be individually indicated, or a combination of the application time and the time period of the AT-SSB may be indicated. The UE may ignore the AT-SSB configuration indicated by the existing SIB1 (or UE-specific signaling). In addition, after the time period of the AT-SSB indicated by GC-DCI or MAC-CE expires (e.g., timer / duration expire), the UE may maintain the most recently indicated SSB pattern until the next base station instruction, or fallback to the AT-SSB pattern previously configured / indicated by SIB1 or UE-specific signaling.

[0074] Since dynamic AT-SSB indications also affect the ROs associated with the actual transmitted SSBs, a terminal can be configured in advance with multiple pairs of RO configurations associated with specific AT-SSB patterns. Simultaneous switching of pairs of SSBs and ROs can be instructed through specific bits / states that have been pre-associated in the bitmaps included in (GC-)DCI or MAC-CE.

[0075] [Method #4] A method to set up a sparse SSB or an existing SSB first, and then set up / instruct an additional SSB that can be added between the sparse SSB or the existing SSB.

[0076] The UE may receive a sparse SSB (e.g., an SSB with a relatively long period) from the base station first, and may also receive an additional SSB to supplement the insufficient SSB. Here, the sparse SSB may refer to a conventional SSB that takes into account a conventional UE (a UE that does not support the R19 NES feature). In order to resolve initial access delay and SSB-based measurement issues that may occur due to an SSB with a long period, an additional SSB may be set between the sparse (conventional) SSBs and dynamically turned ON / OFF. The UE may receive only an SSB with a long period to save energy for the base station, and an additional SSB period / pattern set in advance may be activated / deactivated through (GC-)DCI or MAC-CE according to the judgment of the base station (or at the request of the UE). If there are multiple additional SSB periods / patterns set in advance, which one will be used may be indicated. The UE only receives sparse SSB, but if it needs to receive SSB with a shorter period for initial access procedures, cell (re)selection, handover, synchronization, and measurement, it may transmit a UL signal / channel using UL resources previously configured by the base station to notify the base station of the need and trigger additional SSB instructions. Since whether or not to transmit additional SSB can be determined by the base station, transmitting a UL signal / channel by the UE may not always indicate additional SSB transmission.

[0077] At this time, the activation instruction of additional SSB through (GC-)DCI or MAC-CE may mean turning on the existing SSB and turning on the additional SSB. Alternatively, the activation instruction of additional SSB may mean turning off the existing SSB and turning on the additional SSB. The deactivation instruction of additional SSB may mean turning on the existing SSB and turning off the additional SSB. If the default SSB period and index are preset considering the existing UE, the SSB index transmitted in that period can always be transmitted even if adaptation is indicated regarding whether or not to transmit / period of other SSB bursts / indexes.

[0078] Since dynamic adaptation of additional SSBs also affects the ROs associated with existing / additional SSBs, the terminal can be pre-configured with pairs of additional RO configurations associated with additional SSB cycles / patterns. Simultaneous activation / deactivation of the SSBs and ROs included in a specific pair can be indicated through specific bits / states in fields / bitmaps included in (GC-)DCI or MAC-CE.

[0079] Similar to (de)activation via DCI format 2_9 of R-18 NES cell DTX / DRX configuration, bits for (de)activating additional SSBs and bits for (de)activating (associated) additional ROs for a single cell may be configured separately, and activation / deactivation for each SSB and RO may be independently indicated. Additionally, a bitmap in (GC-)DCI or MAC-CE may be configured to indicate activation / deactivation (and / or which period / pattern) for multiple cells on a cell-by-cell basis. In this case, each bit of the bitmap may be pre-associated with a specific cell index in advance.

[0080] Alternatively, for each SSB index (group), enable / disable (and / or what period / pattern) is indicated in the form of a (group) bitmap in (GC-)DCI or MAC-CE, and if disable is indicated for a specific SSB index (group), the SSB-to-RO mapping for the associated (legacy or additional) ROs is maintained, and only the ROs corresponding to the SSBs that are turned OFF may be considered invalid (by puncturing).

[0081] The application time of a new cycle / pattern indicated via (GC-)DCI or MAC-CE may be a time point previously set by the base station or a time point defined in the standard, or may be directly indicated via GC-DCI or MAC-CE. For example, additional SSBs may be activated 20 ms after receiving GC-DCI. Alternatively, similar to the SI modification period, if a cycle / pattern change instruction is received within a specific window, the existing cycle may be maintained within that window, and the new cycle / pattern may be applied from the beginning of the next window. When the application time point is directly indicated via GC-DCI or MAC-CE, the index of one of multiple pre-configured application time candidates may be indicated.

[0082] When a new period / pattern is indicated through (GC-DCI) or MAC-CE, the terminal can assume the changed period / pattern within the current window (or from the current window). In this case, the terminal can assume reception based on the changed period only for SSBs transmitted after the time when the terminal received the indication, even within the current window. If the SSB position due to the changed period does not include (all) the SSB positions before the period was changed, the terminal can at least assume and attempt reception of both SSBs before and after the period was changed within the current window. In addition, if the number of consecutive windows is indicated from the base station, the length of the section to which the SSB of the changed period is applied can be dynamically indicated.

[0083] Alternatively, the terminal may be configured with a (GC-)DCI / MAC-CE MO indicating additional SSB reception at a specific point in time within the transmission interval of a long-period (legacy) SSB (e.g., several TTIs or subframes before the SSB transmission point in time), and if the (GC-)DCI or MAC-CE is detected in the MO, it may expect SSB reception within the next long-period (legacy) SSB transmission interval.

[0084] [Method #5] The default SSB is transmitted as a sync raster / CD-SSB, and additional adaptable SSBs are transmitted as signals composed only of sync raster / NCD-SSB or PSS / SSS for measurement / sync purposes only.

[0085] CD (Cell-Defining)-SSB is an SSB that provides RMSI (remaining system information), and its MIB (master information block) contains information of scheduled SIB1 containing initial access information related to the cell. On the other hand, NCD (Non-Cell-Defining)-SSB is an SSB that is transmitted additionally in the same cell, but does not contain related RMSI, and therefore does not have an SIB1 associated with the SSB burst. In NR, multiple SSBs can be transmitted within the carrier frequency range to support multiple bandwidth parts (BWPs). One or more BWPs of a serving cell have one CD-SSB transmitted in the synchronization raster (i.e., GSCN). The physical cell ID (PCI) can be conveyed through the PSS and SSS of the CD-SSB.

[0086] On the other hand, one or more NCD-SSBs can be transmitted within or outside the sync raster of the serving cell. NCD-SSBs can be configured based on a different PCI than CD-SSBs and are not associated with the cell's SIB1 or other SIBs. The main difference between CD-SSBs and NCD-SSBs is that NCD-SSBs are not associated with the serving cell's SIB1 and can be transmitted from other cells.

[0087] There were two types of NCD-SSBs previously, one is mainly used in S-cells, etc., and SSBs that do not provide the settings required for terminal SIB1 reception (e.g., settings for CORESET#0 and type0-PDCCH CSS set) and / or SSBs that are not transmitted on the sync raster are defined as NCD-SSB Type 1.

[0088] Additionally, NCD-SSB, introduced in Release-17, can be set to a longer period than CD-SSB, and is defined as NCD-SSB Type 2, as it is created only for synchronization or measurement of BWP.

[0089] For NCD-SSB Type 2, it can be set through the RRC message NonCellDefiningSSB. For NCD-SSB Type 1, it is set based on the same method as the general CD-SSB, but k SSB The value is a specific value (k SSB = 31 for FR1 or k SSB =15 for FR2) or a value in the specified range (24=< k SSB =<29 for FR1 or for 12=< k SSB =<13) may be.

[0090] The default SSB can be defined / configured as CD-SSB or NCD-SSB Type 1 or NCD-SSB Type 2. Additional SSBs can be defined / configured as NCD-SSB Type 1 or NCD-SSB Type 2. Unlike before, CD / NCD-SSB can coexist in the same BWP, two NCD-SSBs can coexist, or the cycle of NCD-SSB can be set to be shorter than that of CD-SSB.

[0091] Meanwhile, additional SSBs can be dynamically (de)activated and turned ON / OFF by the base station depending on specific circumstances / purposes within the cell. Therefore, the default SSB is transmitted as the sync raster / CD-SSB, and the additional SSBs by adaptation can be transmitted as a signal composed only of the sync raster non-sync raster / NCD-SSB or PSS / SSS for measurement / sync purposes only. This can reduce the impact on existing UEs and achieve energy savings, while eliminating sync / measurement issues by providing additional SSBs to NES terminals when needed.

[0092] [Method #6] How to set the default state (initial state) when an additional SSB is set up, and how to indicate which SSB within a BWP will be applied when (de)activation of an additional SSB is indicated by (GC-)DCI or MAC-CE.

[0093] When additional SSBs are configured in the terminal via higher layer signaling, such as RRC, for NES, whether the additional SSB configuration is enabled or disabled can be explicitly configured or indicated via a separate parameter. If there is no configuration / indication of a default state when an additional SSB is configured, it can be agreed / defined to always be enabled or disabled. If the default state is disabled, the additional SSB can be enabled via DCI. Conversely, if the default state is enabled, the additional SSB can be disabled via DCI.

[0094] In addition, when multiple additional SSB configurations can be set, when multiple additional SSB configurations are set, which additional SSB configuration is initially activated can be determined by a rule (e.g., additional SSB configurations of the lowest / highest index) or can be set or indicated via a separate parameter. Alternatively, all configurations can be disabled when additional SSB configurations are set. If a default configuration is set / defined among the additional SSB configurations, the default configuration can always be activated without a separate configuration / indication. Alternatively, when there is no separate configuration / indication for the default state, the default state of the default configuration can be defined as activated, and the default configuration can be disabled via DCI.

[0095] Meanwhile, when the (de)activation of an additional SSB is indicated by (GC-)DCI or MAC-CE, the BWP index may also be indicated since it may be necessary to indicate which BWP among the BWPs configured for the UE will be (de)activated. Furthermore, even if there is no indication of the corresponding BWP index, the frequency resources of the BWP or the additional SSB to be (de)activated may be determined by additional agreements (e.g., current active BWP, initial BWP, default BWP, firstActiveDownlinkBWP, lowest / highest index BWP, etc.) or pre-designation (e.g., a specific reference BWP configured by RRC).

[0096] Meanwhile, the present invention is not limited to the transmission and reception of uplink and / or downlink signals. For example, the present invention can also be used in direct communication between terminals. Furthermore, the base station in the present invention may include not only a base station but also a relay node. For example, the base station operations in the present invention may be performed by the base station, but may also be performed by a relay node.

[0097] It is clear that the examples of the proposed methods described above can also be considered as a type of proposed methods, as they can be included as one of the implementation methods of the present invention. In addition, the proposed methods described above can be implemented independently, but can also be implemented in the form of a combination (or merge) of some of the proposed methods. Information on whether the proposed methods are applicable (or information on the rules of the proposed methods) can be defined by a rule so that the base station notifies the terminal or the transmitting terminal notifies the receiving terminal through a predefined signal (e.g., a physical layer signal or a higher layer signal).

[0098] Implementation example

[0099] Figure 6 is a flowchart of a signal transmission and reception method according to embodiments of the present invention.

[0100] Referring to FIG. 6, a signal transmission and reception method according to an embodiment of the present invention may be performed by a terminal and may include a step (S501) of receiving a first configuration for a first SSB having a specific period, and a step (S503) of receiving the first SSB based on the specific period. A signal transmission and reception method from a base station perspective according to an embodiment of the present invention may include a step (S501) of transmitting a first configuration for a first SSB having a specific period, and a step (S503) of transmitting the first SSB based on the specific period.

[0101] In addition to the operation of FIG. 6, one or more of the operations described through Method #1 to Method #6 may be performed.

[0102] For example, referring to method #4, in addition to the first setting, a second setting for the second SSB may be received / set in the terminal. The first setting may correspond to the sparse SSB setting of method #4, and the second setting may correspond to the additional SSB setting of method #4. Depending on the activation of the second setting, the second SSB may be transmitted from the base station to the terminal in addition to the first SSB. The second SSB may be transmitted with a separate period from the first SSB, or SSBs considering the first SSB and the second SSB together may be transmitted with a period. When the second SSB and the first SSB are transmitted with separate periods, the periods of the two SSBs may be the same or different. When SSBs considering the first SSB and the second SSB together are transmitted with a period, the period may be shorter than a specific period of FIG. 6.

[0103] Activation of the second configuration may be performed based on method #4 and / or method #6. For example, referring to method #4, if the terminal receives a message for activating the second configuration, the second SSB may be received in addition to the first SSB. If the terminal does not receive a message for activating the second configuration, the first SSB may be received without the second SSB. The message for activating the second configuration may be (GC-)DCI or MAC-CE. If activation of the second configuration is required, the terminal may request a message for activating the second configuration from the base station through a preset resource. The first SSB may always be transmitted regardless of activation / deactivation of the second configuration. The time point at which the second configuration is activated may be a certain time after the time point at which the message for activating the second configuration is received.

[0104] The message for activating the second setting may be configured to simultaneously activate the second setting and a pair of associated ROs. Alternatively, information for activating the second setting and information for activating the RO associated with the second setting may be independently included in the message for activating the second setting.

[0105] Referring to Method #6, the second setting may include information indicating whether the second setting is to be activated or deactivated when received / set. A message to activate the second setting may be used if the second setting is deactivated when received / set.

[0106] When multiple second settings are received at the terminal, if one of the multiple second settings corresponds to a default setting, the second setting can be activated without a message for activating the second setting.

[0107] Referring to Method #5, the first SSB may be a CD-SSB transmitted within the sync raster, and the second SSB may be a NCD_SSB transmitted outside the sync raster.

[0108] Additionally, the period of the first SSB can be dynamically changed according to Method #1 and Method #2. Furthermore, the AT-SSB can be dynamically indicated according to Method #3. Sparse SSB and additional SSB can also be transmitted according to Method #5.

[0109] Examples of communication systems to which the present invention is applied

[0110] Although not limited thereto, the various descriptions, functions, procedures, proposals, methods and / or operational flowcharts of the present invention disclosed in this document may be applied to various fields requiring wireless communication / connection (e.g., 5G) between devices.

[0111] Hereinafter, more specific examples will be provided with reference to the drawings. In the drawings / descriptions below, the same drawing reference numerals may represent identical or corresponding hardware blocks, software blocks, or functional blocks, unless otherwise described.

[0112] Figure 13 illustrates a communication system (1) applied to the present invention.

[0113] Referring to FIG. 13, a communication system (1) applied to the present invention includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using a wireless access technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)) and may be referred to as a communication / wireless / 5G 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 Things) device (100f), and an AI device / server (400). For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing vehicle-to-vehicle communication, etc. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, and can be implemented in the form of HMD (Head-Mounted Device), HUD (Head-Up Display) installed in a vehicle, television, smartphone, computer, wearable device, home appliance, digital signage, vehicle, robot, etc. Mobile devices can include smartphone, smart pad, wearable device (e.g., smart watch, smart glass), computer (e.g., laptop, etc.), etc. Home appliances can include TV, refrigerator, washing machine, etc. IoT devices can include sensors, smart meters, etc. For example, base stations and networks can also be implemented as wireless devices, and a specific wireless device (200a) can act as a base station / network node to other wireless devices.

[0114] Wireless devices (100a to 100f) can be connected to a network (300) via a base station (200). Artificial Intelligence (AI) technology can be applied to the wireless devices (100a to 100f), and the wireless devices (100a to 100f) can be connected to an AI server (400) via the network (300). The network (300) can be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, etc. The wireless devices (100a to 100f) can communicate with each other via the base station (200) / network (300), but can also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). In addition, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0115] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (100a~100f) / base stations (200), and base stations (200) / base stations (200). Here, wireless communication / connection can be achieved 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 each other. For example, wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes can be performed based on various proposals of the present invention.

[0116] Examples of wireless devices to which the present invention is applied

[0117] Figure 14 illustrates a wireless device applicable to the present invention.

[0118] Referring to FIG. 14, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals through various wireless access technologies (e.g., LTE, NR). Here, {the first wireless device (100), the second wireless device (200)} can correspond to {the wireless device (100x), the base station (200)} and / or {the wireless device (100x), the wireless device (100x)} of FIG. 13.

[0119] A first wireless device (100) includes one or more processors (102) and one or more memories (104), and may further include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memories (104) and / or the transceivers (106), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (102) may process information in the memory (104) to generate first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver (106). In addition, the processor (102) may receive a wireless signal including second information / signal via the transceiver (106), and then store information obtained from signal processing of the second information / signal in the memory (104). The memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, the memory (104) may perform some or all of the processes controlled by the processor (102), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (102) and the memory (104) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals via one or more antennas (108). The transceiver (106) may include a transmitter and / or a receiver. The transceiver (106) may be used interchangeably with an RF (Radio Frequency) unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0120] The second wireless device (200) includes one or more processors (202), one or more memories (204), and may further include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memories (204) and / or the transceivers (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202) may process information in the memory (204) to generate third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206). Furthermore, the processor (202) may receive a wireless signal including fourth information / signals via the transceivers (206), and then store information obtained from signal processing of the fourth information / signals in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may perform some or all of the processes controlled by the processor (202), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via one or more antennas (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0121] Hereinafter, hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed herein, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) can receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein.

[0122] One or more processors (102, 202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. One or more processors (102, 202) 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 (102, 202). The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software configured to perform one or more processors (102, 202) or stored in one or more memories (104, 204) and executed by one or more processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0123] One or more memories (104, 204) may be coupled to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories (104, 204) may be configured as ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories (104, 204) may be located internally and / or externally to the one or more processors (102, 202). Additionally, the one or more memories (104, 204) may be coupled to the one or more processors (102, 202) via various technologies, such as wired or wireless connections.

[0124] One or more transceivers (106, 206) can transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or flowcharts of this document, to one or more other devices. One or more transceivers (106, 206) can receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts of this document, from one or more other devices. For example, one or more transceivers (106, 206) can be connected to one or more processors (102, 202) and can transmit and receive wireless signals. For example, one or more processors (102, 202) can control one or more transceivers (106, 206) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be coupled to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and receive user data, control information, wireless signals / channels, or the like, as referred to in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein, via one or more antennas (108, 208). In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers (106, 206) can convert received user data, control information, wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors (102, 202).One or more transceivers (106, 206) may convert user data, control information, wireless signals / channels, etc. processed by one or more processors (102, 202) from baseband signals to RF band signals. For this purpose, one or more transceivers (106, 206) may include an (analog) oscillator and / or filter.

[0125] Examples of wireless devices to which the present invention is applied

[0126] Figure 15 illustrates another example of a wireless device applicable to the present invention. The wireless device may be implemented in various forms depending on the use case / service (see Figure 13).

[0127] Referring to FIG. 15, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 14 and may be composed of various elements, components, units / units, and / or modules. For example, the wireless device (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130), and an additional element (140). The communication unit may include a communication circuit (112) and a transceiver(s) (114). For example, the communication circuit (112) may include one or more processors (102, 202) and / or one or more memories (104, 204) of FIG. 14. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 14. The control unit (120) is electrically connected to the communication unit (110), the memory unit (130), and the additional elements (140) and controls the overall operation of the wireless device. For example, the control unit (120) may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit (130). In addition, the control unit (120) may transmit information stored in the memory unit (130) to an external device (e.g., another communication device) via a wireless / wired interface through the communication unit (110), or store information received from an external device (e.g., another communication device) via a wireless / wired interface in the memory unit (130).

[0128] The additional element (140) may be configured in various ways depending on the type of the wireless device. For example, the additional element (140) may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Although not limited thereto, the wireless device may be implemented in the form of a robot (Fig. 13, 100a), a vehicle (Fig. 13, 100b-1, 100b-2), an XR device (Fig. 13, 100c), a portable device (Fig. 13, 100d), a home appliance (Fig. 13, 100e), an IoT device (Fig. 13, 100f), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a fintech device (or a financial device), a security device, a climate / environmental device, an AI server / device (Fig. 13, 400), a base station (Fig. 13, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0129] In FIG. 15, various elements, components, units / parts, and / or modules within the wireless device (100, 200) may be entirely interconnected via a wired interface, or at least some may be wirelessly connected via a communication unit (110). For example, within the wireless device (100, 200), the control unit (120) and the communication unit (110) may be wired, and the control unit (120) and a first unit (e.g., 130, 140) may be wirelessly connected via the communication unit (110). In addition, each element, component, unit / part, and / or module within the wireless device (100, 200) may further include one or more elements. For example, the control unit (120) may be composed of a set of one or more processors. For example, the control unit (120) may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing processor, a memory control processor, etc. As another example, the memory unit (130) may be composed of RAM (Random Access Memory), DRAM (Dynamic RAM), ROM (Read Only Memory), flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0130] Examples of vehicles or autonomous vehicles to which the present invention is applied

[0131] Figure 16 illustrates a vehicle or autonomous vehicle applicable to the present invention. The vehicle or autonomous vehicle may be implemented as a mobile robot, a car, a train, a manned or unmanned aerial vehicle (AV), a ship, or the like.

[0132] Referring to FIG. 16, a vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a driving unit (140a), a power supply unit (140b), a sensor unit (140c), and an autonomous driving unit (140d). The antenna unit (108) may be configured as a part of the communication unit (110). Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 of FIG. 8, respectively.

[0133] The communication unit (110) can transmit and receive signals (e.g., data, control signals, etc.) with external devices such as other vehicles, base stations (e.g., base stations, road side units, etc.), and servers. The control unit (120) can control elements of the vehicle or autonomous vehicle (100) to perform various operations. The control unit (120) can include an ECU (Electronic Control Unit). The drive unit (140a) can drive the vehicle or autonomous vehicle (100) on the ground. The drive unit (140a) can include an engine, a motor, a power train, wheels, brakes, a steering device, etc. The power supply unit (140b) supplies power to the vehicle or autonomous vehicle (100) and can include a wired / wireless charging circuit, a battery, etc. The sensor unit (140c) can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit (140c) may include an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an incline sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit (140d) may implement a technology for maintaining a driving lane, a technology for automatically controlling speed such as adaptive cruise control, a technology for automatically driving along a set path, a technology for automatically setting a path and driving when a destination is set, etc.

[0134] For example, the communication unit (110) can receive map data, traffic information data, etc. from an external server. The autonomous driving unit (140d) can generate an autonomous driving route and driving plan based on the acquired data. The control unit (120) can control the drive unit (140a) so that the vehicle or autonomous vehicle (100) moves along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit (110) can irregularly / periodically acquire the latest traffic information data from an external server and can acquire surrounding traffic information data from surrounding vehicles. In addition, during autonomous driving, the sensor unit (140c) can acquire vehicle status and surrounding environment information. The autonomous driving unit (140d) can update the autonomous driving route and driving plan based on newly acquired data / information. The communication unit (110) can transmit information regarding the vehicle location, autonomous driving route, driving plan, etc. to the external server. External servers can predict traffic information data in advance using AI technology or other technologies based on information collected from vehicles or autonomous vehicles, and provide the predicted traffic information data to the vehicles or autonomous vehicles.

[0135] It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the scope of the invention. Therefore, the above detailed description should not be construed as limiting in any respect, but rather as illustrative. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents of the present invention are intended to be included within the scope of the present invention.

[0136] As described above, the present invention can be applied to various wireless communication systems.

Claims

1. In a method performed by a terminal in a wireless communication system, A step of receiving a first configuration for a first SSB (synchronization signal / physical broadcast channel block) having a specific period; and A step of receiving the first SSB based on the specific cycle; Based on the second setting for the second SSB being received, one or more second SSBs are additionally received between said specific periods. method.

2. In paragraph 1, Based on the message for activating the second setting being received, the second SSB is received in addition to the first SSB, Based on the fact that a message to activate the second setting is not received, the first SSB is received without the second SSB. method.

3. In paragraph 2, The above message is received via DCI (downlink control information) or MAC-CE (medium access control-control element). method.

4. In paragraph 1, The second setting includes information on whether the second setting is activated or deactivated. method.

5. In paragraph 2, A specific resource for requesting the above message is set in advance in the terminal by the base station, method.

6. In paragraph 1, The transmission of the above first SSB is not disabled, method.

7. In paragraph 2, Based on the above message, the RO (random access channel occasion) associated with the second SSB is activated. method.

8. In paragraph 2, The above message further includes information on whether the RO (random access channel occasion) associated with the second SSB is activated. method.

9. In paragraph 2, The above second setting is activated after a certain period of time from the time the message is received. method.

10. In paragraph 1, A plurality of second settings are received and based on which of the plurality of second settings includes a default setting, the default setting is activated without a message to activate the default setting. method.

11. In paragraph 1, The above first SSB is a CD-SSB (cell defining-SSB), and the above second SSB is a NCD-SSB (non cell defining-SSB). method.

12. In paragraph 1, The first SSB is received within the sync raster, and the second SSB is received outside the sync raster. method.

13. In a terminal operating in a wireless communication system, At least one transceiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform a specific operation; The above specific actions are: A step of receiving a first configuration for a first SSB (synchronization signal / physical broadcast channel block) having a specific period; and A step of receiving the first SSB based on the specific cycle; Based on the second setting for the second SSB being received, one or more second SSBs are additionally received between said specific periods. Terminal.

14. In a device for a terminal, at least one processor; and At least one computer memory operably connected to said at least one processor and configured to, when executed, cause said at least one processor to perform operations, said operations comprising: A step of receiving a first configuration for a first SSB (synchronization signal / physical broadcast channel block) having a specific period; and A step of receiving the first SSB based on the specific cycle; Based on the second setting for the second SSB being received, one or more second SSBs are additionally received between said specific periods. device.

15. A computer-readable non-volatile storage medium comprising at least one computer program that causes a terminal including at least one processor to perform an operation, the operation comprising: A step of receiving a first configuration for a first SSB (synchronization signal / physical broadcast channel block) having a specific period; and A step of receiving the first SSB based on the specific cycle; Based on the second setting for the second SSB being received, one or more second SSBs are additionally received between said specific periods. Storage media.

16. In a method performed by a base station in a wireless communication system, A step of transmitting a first configuration for a first SSB (synchronization signal / physical broadcast channel block) having a specific period; and A step of transmitting the first SSB based on the specific cycle; Based on the second setting for the second SSB being received, one or more second SSBs are additionally transmitted between said specific periods. method.

17. In a base station operating in a wireless communication system, At least one transceiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform a specific operation; The above specific actions are: A step of transmitting a first configuration for a first SSB (synchronization signal / physical broadcast channel block) having a specific period; and A step of transmitting the first SSB based on the specific cycle; Based on the second setting for the second SSB being received, one or more second SSBs are additionally transmitted between said specific periods. Base station.

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