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

Abstract

A method and a device for transmitting and receiving a signal in a wireless communication system, disclosed in the present specification, operate on the basis of a cell DTX / DRX configuration and a terminal DRX configuration. Specifically, a signal based on a configuration for one of an SSB, an SIB, a RACH, and paging can be transmitted and received at different periods according to a cell DTX active / inactive duration and a cell DRX active / inactive duration of the cell DTX / DRX configuration.

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 signal transmission and reception method and a device therefor for efficiently transmitting and receiving signals in a wireless communication system.

[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 for transmitting and receiving a signal by a terminal in a wireless communication system is provided, comprising: a step of receiving a setting (setting 1) for a cell discontinuous transmission (DTX) operation and a cell discontinuous reception (DRX) operation; and a step of receiving a setting (setting 2) for one of a synchronization signal / physical broadcast channel block (SSB), a system information block (SIB), a random access channel (RACH), and paging; wherein, within an active period based on the cell DTX operation, a signal based on the setting 2 is received based on a first period, and within a non-active period based on the cell DTX operation, a signal based on the setting 2 is received based on a second period.

[0007] In another aspect of the present invention, a method for transmitting and receiving a signal by a base station in a wireless communication system is provided, comprising: a step of transmitting a setting (setting 1) for a cell discontinuous transmission (DTX) operation and a cell discontinuous reception (DRX) operation; and a step of transmitting a setting (setting 2) for one of a synchronization signal / physical broadcast channel block (SSB), a system information block (SIB), a random access channel (RACH), and paging; wherein, within an active period based on the cell DTX operation, a signal based on the setting 2 is transmitted based on a first period, and within a non-active period based on the cell DTX operation, a signal based on the setting 2 is transmitted based on a second period.

[0008] As another aspect of the present invention, a device, a processor and a storage medium for performing each signal transmission and reception method are provided.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] Figure 1 illustrates the structure of a radio frame.

[0014] Figure 2 illustrates a resource grid of slots.

[0015] Figure 3 shows an example of physical channels being mapped within a slot.

[0016] Figures 4 and 5 illustrate a signal transmission and reception method according to an embodiment of the present invention.

[0017] Figures 6 to 9 illustrate devices according to embodiments of the present invention.

[0018] 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.

[0019] 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.

[0020] 3GPP NR

[0021] - 38.211: Physical channels and modulation

[0022] - 38.212: Multiplexing and channel coding

[0023] - 38.213: Physical layer procedures for control

[0024] - 38.214: Physical layer procedures for data

[0025] - 38.300: NR and NG-RAN Overall Description

[0026] - 38.331: Radio Resource Control (RRC) protocol specification

[0027] Figure 1 illustrates the structure of a radio frame used in NR.

[0028] 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).

[0029] 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.

[0030] [Table 1]

[0031]

[0032] 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.

[0033] [Table 2]

[0034]

[0035] 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.

[0036] 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.

[0037] 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).

[0038] [Table 3]

[0039]

[0040] Figure 2 illustrates the slot structure of an NR frame.

[0041] 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 per 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.

[0042] 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.

[0043] 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).

[0044] Figure 3 shows an example of physical channels being mapped within a slot.

[0045] A DL control channel, DL or UL data, and UL control channel can all be included in a single slot. For example, the first N symbols in a slot can be used to transmit a DL control channel (hereinafter, DL control region), and the last M symbols in the slot can be used to transmit a UL control channel (hereinafter, UL control region). N and M are each integers greater than or equal to 0. A resource region (hereinafter, data region) between the DL control region and the UL control region can be used for DL ​​data transmission or UL data transmission. A time gap for DL-to-UL or UL-to-DL switching can exist between the control region and the data region. A PDCCH can be transmitted in the DL control region, and a PDSCH can be transmitted in the DL data region. Some symbols at the time of switching from DL to UL within a slot can be used as a time gap.

[0046] In the present invention, the base station may be, for example, a gNodeB.

[0047] Uplink (UL) physical channel / signal

[0048] (1) PUSCH

[0049] The PUSCH carries uplink data (e.g., UL-SCH TB) and / or uplink control information (UCI), and is transmitted based on a CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) waveform or a DFT-s-OFDM (Discrete Fourier Transform-spread-OFDM) waveform. When the PUSCH is transmitted based on a DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, when transform precoding is disabled (e.g., transform precoding is disabled), the UE transmits the PUSCH based on the CP-OFDM waveform, and when transform precoding is enabled (e.g., transform precoding is enabled), the UE can transmit the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. PUSCH can be dynamically scheduled by PDCCH (dynamic scheduling) or semi-statically scheduled based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)) (Configured Scheduling, CS). Therefore, in dynamic scheduling, PUSCH transmission is accompanied by PDCCH, but in CS, PUSCH transmission is not accompanied by PDCCH. CS includes Type-1 Configured Grant (CG) PUSCH transmission and Type-2 CG PUSCH transmission. In Type-1 CG, all parameters for PUSCH transmission are signaled by higher layers. In Type-2 CG, some of the parameters for PUSCH transmission are signaled by higher layers, and the rest are signaled by PDCCH. Basically, in CS, PUSCH transmission is not accompanied by PDCCH.

[0050] (2) PUCCH

[0051] PUCCH carries Uplink Control Information (UCI). UCI includes:

[0052] - SR (Scheduling Request): Information used to request UL-SCH resources.

[0053] - HARQ-ACK (Hybrid Automatic Repeat and reQuest Acknowledgement): This is a reception response signal for DL ​​signals (e.g., PDSCH, SPS release PDCCH). The HARQ-ACK response may include positive ACK (simply ACK), negative ACK (NACK), Discontinuous Transmission (DTX), or NACK / DTX. HARQ-ACK can be used interchangeably with A / N, ACK / NACK, HARQ-ACK / NACK, etc. HARQ-ACK can be generated on a TB basis / CBG basis.

[0054] - CSI (Channel Status Information): Feedback information for the DL channel. CSI includes CQI (Channel Quality Information), RI (Rank Indicator), PMI (Precoding Matrix Indicator), and PTI (Precoding Type Indicator).

[0055] Downlink (DL) physical channel / signal

[0056] (1) PDSCH

[0057] The PDSCH carries downlink data (e.g., DL-shared channel transport block, DL-SCH TB). The TB is encoded into a codeword (CW) and then transmitted after undergoing scrambling and modulation processes. A CW includes one or more code blocks (CBs). One or more CBs can be grouped into a single CB group (CBBG). Depending on the cell configuration, a PDSCH can carry up to two CWs. Scrambling and modulation are performed for each CW, and the modulation symbols generated from each CW are mapped to one or more layers. Each layer is precoded, mapped to resources along with the DMRS, and transmitted through the corresponding antenna port. PDSCH can be dynamically scheduled by PDCCH (dynamic scheduling) or semi-statically scheduled based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)) (Configured Scheduling, CS). Therefore, in dynamic scheduling, PDSCH transmission is accompanied by PDCCH, whereas in CS, PDSCH transmission is not accompanied by PDCCH. CS includes semi-persistent scheduling (SPS).

[0058] (2) PDCCH

[0059] The PDCCH carries Downlink Control Information (DCI). For example, the PCCCH (i.e., DCI) carries the transmission format and resource allocation of the DL-SCH, frequency / time resource allocation information for the UL-SCH (shared channel), paging information for the PCH (paging channel), system information on the DL-SCH, frequency / time resource allocation information for upper-layer control messages such as the Random Access Response (RAR) transmitted on the PDSCH, transmission power control commands, and information regarding the activation / release of Configured Scheduling (SPS / CS). Various DCI formats are provided depending on the information contained within the DCI.

[0060] DRX (Discontinuous Reception) Operation

[0061] A terminal can perform DRX operation while performing the procedures and / or methods described / proposed above. A terminal configured for DRX can reduce power consumption by discontinuously receiving DL signals. DRX can be performed in the RRC (Radio Resource Control)_IDLE state, RRC_INACTIVE state, and RRC_CONNECTED state. In the RRC_IDLE state and RRC_INACTIVE state, DRX is used to discontinuously receive paging signals. Hereinafter, DRX performed in the RRC_CONNECTED state (RRC_CONNECTED DRX) will be described.

[0062] Figure 4 illustrates a DRX cycle (RRC_CONNECTED state).

[0063] Referring to FIG. 4, a DRX cycle consists of an On Duration and an Opportunity for DRX. The DRX cycle defines the time interval during which the On Duration is periodically repeated. The On Duration represents the time period during which the UE monitors to receive a PDCCH. When DRX is configured, the UE performs PDCCH monitoring during the On Duration. If a PDCCH is successfully detected during PDCCH monitoring, the UE starts an inactivity timer and remains awake. On the other hand, if no PDCCH is successfully detected during PDCCH monitoring, the UE enters a sleep state after the On Duration ends. Therefore, when DRX is configured, PDCCH monitoring / reception may be performed discontinuously in the time domain when performing the procedures and / or methods described / proposed above. For example, when DRX is configured, in the present invention, PDCCH reception opportunities (e.g., slots having PDCCH search spaces) may be set discontinuously according to the DRX configuration. On the other hand, when DRX is not configured, PDCCH monitoring / reception may be performed continuously in the time domain when performing the procedures and / or methods described / proposed above. For example, when DRX is not configured, in the present invention, PDCCH reception opportunities (e.g., slots having PDCCH search spaces) may be set continuously. On the other hand, regardless of whether DRX is configured, PDCCH monitoring may be limited in the time interval set as the measurement gap.

[0064] Table 4 shows the process of the terminal related to DRX (RRC_CONNECTED state). Referring to Table 4, DRX configuration information is received through upper layer (e.g., RRC) signaling, and whether DRX is turned on / off is controlled by the DRX command of the MAC layer. When DRX is set, the terminal can perform PDCCH monitoring discontinuously when performing the procedure and / or method described / proposed in the present invention, as exemplified in FIG. 4.

[0065] Type of signalsUE procedure1st stepRRC signaling(MAC-CellGroupConfig)- Receive DRX configuration information2nd StepMAC CE((Long) DRX command MAC CE)- Receive DRX command3rd Step-- Monitor a PDCCH during an on-duration of a DRX cycle

[0066] Here, MAC-CellGroupConfig contains configuration information required to set MAC (Medium Access Control) parameters for a cell group. MAC-CellGroupConfig may also contain configuration information regarding DRX. For example, MAC-CellGroupConfig may contain the following information to define DRX:

[0067] - Value of drx-OnDurationTimer: Defines the length of the starting section of the DRX cycle.

[0068] - Value of drx-InactivityTimer: Defines the length of time period during which the terminal remains awake after a PDCCH opportunity is detected indicating initial UL or DL ​​data.

[0069] - Value of drx-HARQ-RTT-TimerDL: Defines the maximum time interval between the reception of a DL initial transmission and the reception of a DL retransmission.

[0070] - Value of drx-HARQ-RTT-TimerDL: Defines the maximum length of the time interval from when a grant for UL initial transmission is received until a grant for UL retransmission is received.

[0071] - drx-LongCycleStartOffset: Defines the time length and start point of the DRX cycle.

[0072] - drx-ShortCycle (optional): Defines the time length of the short DRX cycle.

[0073] Here, if any one of drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, and drx-HARQ-RTT-TimerDL is in operation, the terminal maintains an awake state and performs PDCCH monitoring at every PDCCH opportunity.

[0074] 1. Common channels with Cell DTX-DRX operation

[0075] The above-mentioned contents can be applied in combination with the proposed methods described below, or can be supplemented to clarify the technical characteristics of the proposed methods.

[0076] 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.

[0077] Energy conservation at base stations is a key consideration in wireless communication systems, including 3GPP, as it can contribute to building eco-friendly networks by reducing carbon emissions and reducing the operational expenditure (OPEX) of telecommunications operators. In particular, the introduction of 5G communications will require higher transmission rates, necessitating base stations to be equipped with more antennas and provide services over wider bandwidths and frequency bands. Consequently, recent studies have shown that base station energy costs have reached up to 20% of total OPEX. This increased interest in base station energy conservation led to the approval of a new study item, "Study on Network Energy Savings," in 3GPP NR Release 18.

[0078] Specifically, in order to improve the energy saving capability of the base station from the perspective of transmission and reception, the following enhancement techniques are being considered.

[0079] - How to achieve more efficient operation dynamically and / or semi-statically and finer granularity adaptation of transmissions and / or receptions in one or more of network energy saving techniques in time, frequency, spatial, and power domains, with potential support / feedback from UE, and potential UE assistance information.

[0080] In particular, this specification proposes a method for saving base station energy by setting a specific ON / OFF pattern in advance for a terminal in idle and / or inactive mode, and performing cell DTX / DRX operation that does not transmit / receive a specific signal / channel in the OFF pattern.

[0081] When a terminal initially connects to a base station and enters connected mode, it must continuously perform PDCCH monitoring to check if there is a transmission scheduled for it in each configured search space (SS). However, if this scheduling is not always present, the terminal's battery may quickly be drained due to unnecessary PDCCH monitoring every time. Therefore, the base station can set C-DRX (connected mode discontinuous reception), which is an operation that achieves a power saving effect for the terminal by setting a time period (ON duration) during which the terminal must perform PDCCH monitoring and a time period (OFF duration) during which the terminal does not need to perform PDCCH monitoring. From the base station's perspective, the terminal's C-DRX can also be helpful for ES, as the terminal does not need to transmit PDCCH to the terminal during the C-DRX OFF period, so the resource can be used for other purposes and ES benefits can be obtained through DTX / DRX. However, since the terminal can transmit without limitation as needed in the OFF section using pre-configured resources (e.g., SR, PUCCH, CG-PUSCH, etc.), the base station must wait for the UL reception of the terminal, which may or may not transmit. In addition, C-DRX is configured specifically for the terminal. Since the DRX cycle or ON / OFF section is not aligned between the terminals within the cell, if the ON section of the terminals is configured in a TDM form, the base station must perform PDCCH transmission for every ON section, and therefore cannot sleep, making it difficult to expect ES gain.

[0082] Therefore, the base station can save energy by turning off the transmission / reception of specific signals / channels during the inactive period through cell-specific DTX / DRX configuration that periodically repeats active and inactive periods similar to UE C-DRX. In order for the terminal to transmit or receive data, it must establish a connection with the base station and enter RRC_CONNECTED mode. If the terminal is inactive for a certain period of time, the base station moves the terminal to the RRC_IDLE state to reduce the terminal's power consumption. Since the terminal must transition back to the connected mode whenever transmission / reception is required, this RRC signaling may increase latency. If the terminal needs to transmit small data frequently, not only the delay but also the signaling overhead increases. To reduce the base station signaling overhead and delay caused by these frequent RRC state changes, a new state called RRC_INACTIVE was introduced. In the inactive mode, the RRC connection is suspended, so that transmission / reception operations can be performed quickly and with less signaling overhead. In this specification, when applying cell DTX / DRX operations not only to connected mode UEs but also to idle and inactive mode UEs, a method for setting parameters of cell DTX / DRX configuration, an activation method, and a method for transmitting / receiving signals and channels affected by cell DTX / DRX operations are proposed.

[0083] In the present invention, the fact that the base station operates in the NES mode for ES may mean, for example, that the base station sets multiple OFF periods (DTX periods of the base station) in advance to turn off transmission of a specific DL signal during a specific time period, and dynamically indicates one of the OFF periods to indicate that the corresponding DL signal will not be transmitted during the predefined time period, thereby operating in such a way that power consumption of the base station and the terminal can be reduced. In addition, the fact that the base station operates in the NES mode for ES may also mean an operation mode in which, in BWP switching and dynamic RB adaptation in the frequency domain as well as the time domain, when a specific receiving antenna port of the base station is turned off semi-statically or dynamically, the base station does not perform transmission and / or reception through the corresponding antenna port, thereby reducing power consumption of the base station and the terminal. Additionally, the fact that the base station operates in NES mode for ES may mean an operating mode in which the base station does not transmit and / or receive through a specific receiving antenna port of the base station when the antenna port is turned off semi-statically or dynamically in the spatial domain, thereby reducing power consumption of the base station and terminals.

[0084] A UE in connected mode periodically monitors PDCCH during the ON period to check if there are DL / UL signals to transmit / receive. When a PDCCH is received during the ON period, the UE performs DL reception or UL transmission according to the instruction. In the case of UL transmission of the UE, even a UE in sleep mode can wake up and transmit SR if there is data in the UL buffer, regardless of C-DRX. In the case of an idle mode UE, it can operate in idle mode DRX (I-DRX), periodically monitoring paging and entering sleep mode again if it is not the target UE. Here, the meaning of the UE operating in sleep mode can mean “regardless of the active time determined by C-DRX” or “even in a period other than the active time determined by C-DRX.” ‘Repeated time periods consisting of ON and OFF periods in C-DRX operation’ is defined as a DRX cycle. The length of a DRX cycle is defined as the time from the start of an ON period to the start of the next ON period. DRX cycles can be classified as long DRX cycles and short DRX cycles. If the length of a DRX cycle is long, if a PDSCH to be sent by the base station occurs immediately after a specific ON period of the UE ends, the base station must wait until the next ON period of the UE, which may increase latency. Since the UE does not transmit P-CSI or SRS during the OFF period, the base station can increase resource utilization by allocating the resources to other UEs. The base station can also operate in energy saving mode to save power during the OFF period of the UE.

[0085] Meanwhile, a long DRX cycle and a short DRX cycle can be set at the same time, and in this case, the long DRX cycle must be set to an integer multiple of the short DRX cycle (onDurationTimer values ​​are the same). If there is no data activity during the ON period of the long DRX cycle (for example, if there is no PDCCH reception), the UE operates in the long DRX cycle. If there is data activity during the ON period of the long DRX cycle, the UE operates in the short DRX cycle for the time period corresponding to drx-ShortCycleTimer, and if there is no data activity during the ON period of the short DRX cycle, the UE switches back to the long DRX cycle and operates. At this time, the start of the ON period in the short DRX cycle is determined by the drx-StartOffset and drx-SlotOffet values, just like in the long DRX cycle.

[0086] The base station can instruct the terminal to enter DRX sleep directly without operating in active mode until the end of the ON period through the DRX command MAC CE (control element). In other words, the current base station can terminate the active time of the terminal and enter the DRX cycle directly. If only the long DRX cycle is configured for the terminal, the terminal will operate only in the long DRX cycle, and if the short DRX cycle is also configured, the terminal will enter the short DRX cycle mode immediately after receiving the DRX command MAC CE. In addition, if the base station instructs the long DRX command MAC CE, the terminal will operate in the long DRX cycle mode even if the short DRX cycle is configured.

[0087] Additionally, the base station can control the starting point of a long DRX cycle through the RRC parameter drx-LongCycleStartOffset, where the offset value is defined in units of ms so that a long DRX cycle can start at a slot boundary. In addition, the starting point of the ON interval can be set at slot level granularity through another RRC parameter drx-SlotOffset. The start of the ON interval is defined as the relative position of the ON interval by applying the slot offset indicated from the reference point indicated by LongCycleStartOffset.

[0088] By waking up only during the ON period through the C-DRX configuration and monitoring the presence or absence of PDCCH transmitted to itself, the terminal can perform ES compared to continuously (e.g., every slot) monitoring the PDCCH. If the base station has no data to transmit in the next (upcoming) ON period of the terminal, it can transmit a WUS before the start of the ON period of the terminal to indicate that there is no need to wake up during the ON period (i.e., there is no need to start the duration timer), thereby saving a little more battery of the terminal. If the base station has no data to transmit / receive in the next ON period for a terminal with C-DRX configured, it can transmit a WUS through DCI format 2_6 in the WUS occasion set before the ON period to indicate to the terminal that there is no need to wake up during the current ON period. The terminal that receives the WUS indication can continue to sleep without switching to the active mode, thereby enabling more ES.

[0089] Meanwhile, the cell DTX / DRX settings may include parameters such as periodicity, slot, offset, and on duration, similar to the C-DRX settings of the terminal. The cell DTX settings and the cell DRX settings may be independently set and activated / deactivated. That is, only the cell DTX may be set and activated without the cell DRX settings, or conversely, only the cell DRX may be set and activated without the cell DTX settings. Even if both the cell DTX and the cell DRX are set, only one of the settings may be activated.

[0090] Cell DTX / DRX operation has a structure similar to that of UE's C-DRX, and can be composed of an active period in which all signals and channels can be transmitted / received without restriction, and a non-active period in which all signals and channels can be turned off or only specific signals and channels can be transmitted / received in a restricted manner. For example, only PDCCH transmission or RACH / SR PUCCH reception of the base station may be allowed in the non-active period. Cell DTX / DRX configuration can be configured and activated only by RRC. Alternatively, some parameters can be configured by RRC and the remaining parameters can be configured / indicated and activated through L1 / L2 signaling. L1 / L2 signaling can be, for example, (group-common) DCI / MAC-CE. Information about the location and length of the active and non-active periods of cell DTX / DRX can be received and configured in advance through specific RRC parameters. For example, the start point of the active period can be set through an offset from a specific subframe boundary or a specific SFN value. In addition, the duration of the active period can be set through a parameter or a timer related to the length. In this case, multiple candidates for the parameter or timer can be set in advance through RRC signaling, and then one of the set candidates can be indicated at the time of activation through L1 / L2 signaling. In the cell DTX / DRX active period, all signals and channels can be transmitted / received without any special transmission / reception restrictions, just like the general operation of the base station. The time period outside the active period is basically regarded as an inactive period, and transmission / reception may be restricted except for signals and channels that are set in advance.Since the base station can obtain ES (energy saving) benefits through this minimal transmission / reception operation, the operation of the inactive period of the cell DTX / DRX operation can be regarded as the operation when the NES state / mode is ON.

[0091] Even for a UE in RRC_IDLE or RRC_INACTIVE state, a semi-static ON / OFF interval pattern can be configured through cell DTX / DRX configuration, and signals / channels that will not be transmitted / received during the OFF intervals can be configured in advance. For example, in a PO (paging occasion) that is completely included in or partially overlapped with a cell DTX inactive interval, paging DCI may not be monitored, and reception of common broadcast signals / channels such as SSB / SIB1 may also be turned OFF. In addition, for a RO (RACH occasion) that is completely included in or partially overlapped with a cell DRX inactive interval, the RO may be regarded as a resource on which PRACH transmission cannot be performed. In addition, the UE may maintain the cell DTX / DRX configuration configured in connected mode even if the RRC state is switched (RRC release). Additionally, the terminal can separately receive settings for parameters to be applied or signals / channels to be turned off for each RRC state through cell DTX / DRX settings and apply them according to its own RRC state.

[0092] Meanwhile, a terminal in RRC_IDLE state is not registered to a specific cell, so it does not have an access stratum (AS) context and does not have information received from the base station. The base station can initiate an RRC connection release process to transition the terminal in RRC_CONNECTED state to RRC_IDLE state. The terminal can also request the base station to perform the RRC connection release process. The terminal is in a type of sleep mode and wakes up periodically according to the SIB or the (I-)DRX cycle set by the base station to monitor the paging message transmitted by the base station. The base station can notify the terminals in RRC_IDLE state of whether there is data to receive through the paging message, and can notify the terminals of system information changes and ETWS (Earthquake and Tsunami Warning System) / CMAS (Commercial Mobile Alert System) instructions through short messages.

[0093] A UE in RRC_IDLE state monitors paging channels for CN (core network)-initiated paging. A UE in RRC_INACTIVE state monitors paging channels for RAN (radio access network)-initiated paging. However, the UE does not need to continuously monitor these paging channels, and can reduce power consumption by monitoring the paging channels only at one PO (paging occasion) per DRX cycle according to the paging DRX cycle. A UE can transmit a PRACH to the base station when it wants to transition from RRC_IDLE state to RRC_CONNECTED state or when it wants to request on-demand SI, but it cannot transmit any UL except for the PRACH.

[0094] As previously explained, the RRC_INACTIVE state is used not only to reduce the signaling overhead of the base station, but also to reduce the delay associated with transitioning to the RRC_CONNECTED state. In addition, a terminal in the RRC_INACTIVE state can operate similarly to the RRC_IDLE state to save power. In the RRC_INACTIVE state, the AS context is stored in the terminal and the base station, which can enable faster state transition from the RRC_INACTIVE state to the RRC_CONNECTED state. In the RRC_INACTIVE state, the terminal remains in the CN-CONNECTED state.

[0095] The RRC_INACTIVE state is similar to the RRC_IDLE state, in which the UE is in a kind of sleep mode and wakes up periodically according to the SIB or DRX cycle set by the eNB to monitor whether there is a paging message transmitted by the eNB. The eNB can notify the UE in RRC_INACTIVE state whether there is data to receive through the paging message, and can change the SI information of the UE in RRC_INACTIVE state and instruct ETWS / CMAS through short messages. Similar to the RRC_IDLE state, the PDCCH containing the paging message and short message is scrambled with the P-RNTI, and the I-RNT can be used to identify the suspended UE context. The eNB can assign the I-RNTI to the UE when the UE moves from the RRC_CONNECTED state to the RRC_INACTIVE state through the RRCRelease message in the SuspendConfig. In the RRC_INACTIVE state, the UE can transmit PRACH to transition to the RRC_CONNECTED state or to request on-demand SI information, and cannot transmit any UL signal / channel other than PRACH.

[0096] For convenience, in the following specification, a terminal in the RRC_IDLE state may be expressed as a terminal operating in idle mode, and a terminal in the RRC_INACTIVE state may be expressed as a terminal operating in inactive mode.

[0097] [Method #1] Processes related to SSB / SIB / Paging / RACH setup and cell DTX / DRX (de)activation

[0098] (1) A method of associating the cell DTX / DRX setting activation / deactivation cycle with the (default or configured) paging cycle or modification cycle (e.g., integer multiple of the paging cycle).

[0099] Similar to UE C-DRX, cell DTX / DRX configuration has a semi-static pattern that repeats periodically in a cycle consisting of an On duration during which the base station transmits / receives without any special restrictions and an Off duration during which energy saving benefits can be obtained by turning off transmission / reception of preset signals / channels or setting the cycle to a long period. In the case of cell DTX / DRX configuration for connected mode terminals, it may be efficient in terms of the operations of the base station and terminals if the length of the On duration and the length of the cycle are set to have a range of values ​​similar to the length of the On duration of the UE C-DRX and the long cycle length of the C-DRX.

[0100] Similarly, there is a paging cycle for idle / inactive mode terminals. Since the terminal has an I-DRX operation that monitors the presence of page messages only at the PO (paging occasion) set for itself and maintains a sleep state for the rest of the time to reduce power consumption, the length of the on-interval and the length of the cycle that are related to or have a similar value range to the length of the I-DRX paging cycle or the SIB modification cycle can also be considered for cell DTX / DRX configuration for idle / inactive mode terminals.

[0101] In the case of paging cycles, there is a basic paging cycle set by SIB and a configured paging cycle set by the base station. If the terminal does not have a separate paging cycle set by the base station, it always operates with the basic paging cycle. In addition, the modification cycle is a unit cycle in which the information of SIB1 is updated, and the same SIB1 information is always transmitted within the modification cycle. If an update is required in the middle of the modification cycle, SIB1 is transmitted with the updated information from the next modification cycle after the modification cycle ends.

[0102] Therefore, the ON / OFF period (active / non-active period) and the value or range of values ​​of the DTX / DRX cycle of the cell DTX / DRX setting for idle / inactive mode may be set to be equal to the default paging cycle or the configured paging cycle, or to an integer multiple of the default paging cycle or the configured paging cycle. Alternatively, the ON / OFF period (active / non-active period) and the value or range of values ​​of the DTX / DRX cycle of the cell DTX / DRX setting for idle / inactive mode may be set to a value of a modification period, an integer multiple of the modification period value, or {(modification period) / N}.

[0103] (2) A method of turning off transmission / reception of SSB / SIB / paging / RACH in a non-active period (or during a specific paging cycle) within a preset Cell DTX / DRX pattern, or setting different transmission / reception cycles of SSB / SIB / paging / RACH in the active period and the non-active period.

[0104] Even while operating in idle / inactive mode, the UE can monitor paging at PO within a paging cycle, receive SSB for RRM measurement, and receive SIB for system information reception. In addition, when transmission / reception is required, the UE can transmit RACH at a pre-configured RO (RACH Occasion) to switch to connected mode. At this time, in order to maximize the energy saving benefit of the base station, when the UE operates according to the ON / OFF period set by the activated cell DTX / DRX configuration, the UE can be configured / instructed to temporarily turn off transmission / reception of SSB / SIB / paging / RACH during the OFF period (or during a specific paging cycle) or to transmit / receive only at long periods. For example, if SSB / SIB1 is received at a 20ms period during the cell DTX active period, SSB / SIB1 can be received at a 40ms period during the inactive period. Alternatively, in the cell DRX active period, all configured ROs can be used as valid RO resources for PRACH transmission, but for ROs included in the inactive period, only specific ROs (e.g., ROs in the even slot index or ROs included in a specific RO configuration index) can be used as valid ROs for PRACH transmission.

[0105] (3) A method in which the SSB / SIB / PO / RACH settings are set when the cell DTX / DRX setting is activated and the SSB / SIB / PO / RACH settings are set when the cell DTX / DRX setting is deactivated, and switching is performed between each setting.

[0106] An idle / inactive mode terminal that has received cell DTX / DRX configuration can be configured with SSB / SIB / PO / RACH configuration for when the cell DTX / DRX configuration is activated and SSB / SIB / PO / RACH configuration for when the cell DTX / DRX configuration is deactivated. For example, multiple configurations related to SSB / SIB / RACH / paging can be configured through SIB. The multiple configurations can include two configurations: a normal configuration to be applied to an idle mode cell DTX active section and a light configuration to be applied to an inactive section. In the case of SSB / SIB / RACH / paging configuration to be used in a cell DTX / DRX inactive section, SSB / SIB / RACH / paging opportunities can be configured to be relatively sparse compared to opportunities in the active section. An idle / inactive mode terminal can perform transmission / reception by switching SSB / SIB / PO / RACH settings as the cell DTX / DRX settings are activated or deactivated through a specific GC-DCI or MAC CE.

[0107] Alternatively, when the cell DTX / DRX configuration is enabled, the SSB / SIB / PO / RACH can be switched to a configuration where they are all included within the cell DTX ON interval, or the SSB / SIB / RACH / paging opportunities that would otherwise be turned OFF in the idle mode cell DTX inactive interval can be shifted to the cell DTX active interval. Specifically, since the cell DTX / DRX configuration is applied per cell or cell group, when the cell DTX / DRX configuration of a specific cell or cell group is enabled, the paging transmission of that cell is turned OFF, and paging messages can be received through the PO configured in the frequency resources of other cells.

[0108] [Method #2] Joint operation of (i) cell DTX / DRX and (ii) SSB-less or simplified SSB

[0109] Method #2 may include the following methods:

[0110] (1) A method of operating without SSB or based on simplified SSB during the cell DTX inactive period, but transmitting existing SSB during the active period.

[0111] (2) A method of operating without SSB during the cell DTX inactive period, but transmitting a simplified SSB during the active period.

[0112] (3) A method of turning off all resources except RACH resources for on-demand SSB / SIB during the cell DTX / DRX inactivity period.

[0113] Below is a detailed description of methods (1) to (3) of method #2.

[0114] Base stations can achieve high energy-saving benefits by lengthening the period of common signals / channels such as periodically transmitted SSB / SIB, or by turning off SSB / SIB transmission during specific time intervals. However, since SSB or SIB are important channels used not only for time / frequency synchronization but also for RLM / RRM measurement and system information acquisition, changing the transmission period to long or turning off the transmission itself may degrade the performance of the terminal. However, in certain scenarios, high energy-saving benefits can be achieved by minimizing or turning off SSB / SIB transmission while minimizing performance degradation. For example, in a CA scenario where multiple cells / carriers are configured for a terminal, SSB / SIB is transmitted in the same manner as before in the anchor cell / carrier, and the SI (system information) of non-anchor cells / carriers operating in energy-saving mode (e.g., operating according to the Cell DTX / DRX configuration) can be multiplexed onto the SSB / SIB of the anchor cell / carrier (SIB-less cell / carrier). Here, in certain non-anchor cells / carriers, not only SI but also SSB transmission may not be performed, and only a minimal RS (reference signal) for cell discovery and time / frequency synchronization may be transmitted. For example, in certain non-anchor cells / carriers, only a simplified 2-symbol SSB consisting of only PSS and SSS may be transmitted. Alternatively, in certain non-anchor cells / carriers, no transmission at all may be performed. In these SSB and / or SIB-less cells / carriers, the UE can receive SSB / SIB by requesting SSB / SIB from the base station on-demand through UL resources such as pre-configured RACH.

[0115] Meanwhile, the base station can obtain energy saving gains during the inactive period by linking this SSB / SIB-less operation with the cell DTX / DRX configuration, by operating without SSB (or with simplified SSB) during the cell DTX inactive period and transmitting the same SSB as before during the active period. Alternatively, the base station can operate without SSB during the cell DTX inactive period, but transmit only simplified SSB during the cell DTX active period. Alternatively, all signals / channels except RACH resources for on-demand SSB / SIB can be turned OFF during the cell DTX / DRX inactive period to maximize the energy saving gains.

[0116] 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.

[0117] 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 as 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).

[0118] Implementation example

[0119] Figure 5 is a flowchart of a signal transmission and reception method according to embodiments of the present invention.

[0120] Referring to FIG. 5, embodiments of the present invention can be performed by a terminal and can be configured to include a step (S501) of receiving a setting (setting 1) for a cell DTX operation and a cell DRX operation, and a step (S503) of receiving a setting (setting 2) for one of SSB, SIB, RACH, and paging.

[0121] Other embodiments of the present invention may be performed by a base station and may include a step (S501) of transmitting a setting (setting 1) for cell DTX operation and cell DRX operation, and a step (S503) of transmitting a setting (setting 2) for one of SSB, SIB, RACH, and paging.

[0122] In addition to the operations of FIG. 5, one or more of the operations described in Section 1 may be additionally performed.

[0123] For example, referring to (2) and (3) of Method #1, the period of Setting 2 may be set differently for the active / inactive periods of each of the cell DTX operation and the cell DRX operation. Accordingly, a signal based on Setting 2 in an active period based on the cell DTX operation may be received based on the first period, and a signal based on Setting 2 in an inactive period based on the cell DTX operation may be received based on the second period. In addition, a signal based on Setting 2 in an active period based on the cell DRX operation may be transmitted based on the third period, and a signal based on Setting 2 in an inactive period based on the cell DRX operation may be transmitted based on the fourth period. In order to reduce transmission and reception within each inactive period, the second period may be set longer than the first period, and the fourth period may also be set longer than the third period.

[0124] Alternatively, a signal based on setting 2 may not be received during an inactive period based on cell DTX operation, or a signal based on setting 2 may not be transmitted during an inactive period based on cell DRX operation. That is, a signal based on setting 2 may not be received during the second period, and a signal based on setting 2 may not be transmitted during the fourth period.

[0125] In the case of a configuration for RACH, ROs, which are opportunities for transmitting PRACHs based on the configuration, are all configured as valid RO resources (resources available for PRACH transmission) in the active period based on the cell DRX operation, but only some ROs may be configured as valid RO resources in the inactive period based on the cell DRX operation. Specifically, the valid RO resources may be determined based on the slot index (e.g., odd or even index) to which the RO resources belong, or based on the index of the configuration for RACH. Alternatively, ROs may be configured only in the active period based on the cell DRX operation, and may not be located in the inactive period based on the cell DRX operation.

[0126] As a method for distinguishing between the active period and the inactive period, section (2) of method #1 may include information on two periods within one configuration (or one RRC configuration). In addition, referring to section (3), multiple configurations 2 may be configured for each activation / deactivation of cell DTX operation and cell DRX operation and for each active period / inactive period.

[0127] For example, there may be a setting 2 for when the cell DTX operation is activated, a setting 2 for when the cell DTX operation is deactivated, a setting 2 for when the cell DRX operation is activated, and a setting 2 for when the cell DRX operation is deactivated. In addition, there may be a setting 2 for an active period based on the cell DTX operation when the cell DTX operation is activated, and a setting 2 for an inactive period based on the cell DTX operation. Similarly, there may be a setting 2 for an active period based on the cell DRX operation, and a setting 2 for an inactive period based on the cell DRX operation when the cell DRX operation is activated. Each setting 2 may be expressed in a manner such as setting 2-1, setting 2-2, ..., setting 2-n. The first to fourth periods described above may be respectively set via different settings 2 (settings 2-1 to 2-4).

[0128] Setting 2 for when cell DTX operation or cell DRX operation is activated may be setting 2 in which all transmission / reception opportunities of signals based on setting 2 are located within the active period of cell DTX operation or cell DRX operation. Alternatively, transmission opportunities of signals based on setting 2 in the inactive period based on cell DTX operation or cell DRX operation may be shifted to the active period based on cell DTX operation or cell DRX operation.

[0129] In addition to the operations described with respect to FIG. 5, one or more of the operations described with respect to FIGS. 1 to 4 and / or the operations described in Section 1 may be additionally performed in combination.

[0130] Examples of communication systems to which the present invention is applied

[0131] 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.

[0132] 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.

[0133] Figure 6 illustrates a communication system (1) applied to the present invention.

[0134] Referring to FIG. 6, 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.

[0135] 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).

[0136] 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.

[0137] Examples of wireless devices to which the present invention is applied

[0138] Figure 7 illustrates a wireless device applicable to the present invention.

[0139] Referring to FIG. 7, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals via 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. 6.

[0140] 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.

[0141] 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.

[0142] Hereinafter, the 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] Examples of wireless devices to which the present invention is applied

[0147] Figure 8 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 6).

[0148] Referring to FIG. 8, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 7 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. 7. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 7. 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).

[0149] 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. 6, 100a), a vehicle (Fig. 6, 100b-1, 100b-2), an XR device (Fig. 6, 100c), a portable device (Fig. 6, 100d), a home appliance (Fig. 6, 100e), an IoT device (Fig. 6, 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. 6, 400), a base station (Fig. 6, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0150] In FIG. 8, 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.

[0151] Examples of vehicles or autonomous vehicles to which the present invention is applied

[0152] Figure 9 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.

[0153] Referring to FIG. 9, 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] As described above, the present invention can be applied to various wireless communication systems.

Claims

1. In a method for a terminal to transmit and receive a signal in a wireless communication system, A step of receiving a setting (setting 1) for cell DTX (discontinuous transmission) operation and cell DRX (discontinuous reception) operation; and A step of receiving a setting (setting 2) for one of SSB (synchronization signal / physical broadcast channel block), SIB (system information block), RACH (random access channel), and paging; Within the active period based on the above cell DTX operation, a signal based on the above setting 2 is received based on the first cycle, Within the non-active period based on the above cell DTX operation, the signal based on the above setting 2 is received based on the second cycle. Method of transmitting and receiving signals.

2. In paragraph 1, N ROs (RACH occasions) are set for transmission of PRACH (physical random access channel) based on the settings for the above RACH, Within the active period based on the above cell DRX operation, all of the N ROs are set to be available for the PRACH transmission, Within the inactive period based on the above cell DRX operation, only some of the N ROs are set to be available for the PRACH transmission. Method of transmitting and receiving signals.

3. In paragraph 2, The above some ROs are determined based on the slot index to which each of the N ROs belongs or the index of the setting for the RACH. Method of transmitting and receiving signals.

4. In paragraph 1, In the second cycle, the signal based on the setting 2 is set not to be received. Method of transmitting and receiving signals.

5. In paragraph 1, N ROs (RACH occasions) are set for transmission of PRACH (physical random access channel) based on the settings for the above RACH, The above N ROs are located only within the active period based on the cell DRX operation and are not located within the inactive period based on the cell DRX operation. Method of transmitting and receiving signals.

6. In paragraph 1, The above setting 2 includes setting 2-1 for the active section and setting 2-2 for the inactive section. Method of transmitting and receiving signals.

7. In paragraph 6, The first cycle is set based on the above setting 2-1, and the second cycle is set based on the above setting 2-2. Method of transmitting and receiving signals.

8. In paragraph 1, The second cycle is set to a longer cycle than the first cycle. Method of transmitting and receiving signals.

9. In paragraph 1, The index of the above setting 2 is changed based on whether the above setting 1 is activated or deactivated. Method of transmitting and receiving signals.

10. In paragraph 4, Based on the activation of the above setting 1, the above setting 2 is set to a setting in which transmission opportunities for one of the SSB, the SIB, the RACH, and the paging are located only in the active section. Method of transmitting and receiving signals.

11. In paragraph 4, Based on the activation of the above setting 1, the transmission opportunities of the signal based on the above setting 2 are shifted to the above active period. Method of transmitting and receiving signals.

12. In a terminal for transmitting and receiving signals 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 setting (setting 1) for cell DTX (discontinuous transmission) operation and cell DRX (discontinuous reception) operation; and A step of receiving a setting (setting 2) for one of SSB (synchronization signal / physical broadcast channel block), SIB (system information block), RACH (random access channel), and paging; Within the active period based on the above cell DTX operation, a signal based on the above setting 2 is received based on the first cycle, Within the non-active period based on the above cell DTX operation, the signal based on the above setting 2 is received based on the second cycle. Terminal.

13. 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 setting (setting 1) for cell DTX (discontinuous transmission) operation and cell DRX (discontinuous reception) operation; and A step of receiving a setting (setting 2) for one of SSB (synchronization signal / physical broadcast channel block), SIB (system information block), RACH (random access channel), and paging; Within the active period based on the above cell DTX operation, a signal based on the above setting 2 is received based on the first cycle, Within the non-active period based on the above cell DTX operation, the signal based on the above setting 2 is received based on the second cycle. device.

14. A computer-readable non-volatile storage medium comprising at least one computer program that causes at least one processor to perform an operation, the operation comprising: A step of receiving a setting (setting 1) for cell DTX (discontinuous transmission) operation and cell DRX (discontinuous reception) operation; and A step of receiving a setting (setting 2) for one of SSB (synchronization signal / physical broadcast channel block), SIB (system information block), RACH (random access channel), and paging; Within the active period based on the above cell DTX operation, a signal based on the above setting 2 is received based on the first cycle, Within the non-active period based on the above cell DTX operation, the signal based on the above setting 2 is received based on the second cycle. Storage media.

15. In a method for a base station to transmit and receive signals in a wireless communication system, A step of transmitting settings (setting 1) for cell DTX (discontinuous transmission) operation and cell DRX (discontinuous reception) operation; and A step of transmitting a setting (setting 2) for one of SSB (synchronization signal / physical broadcast channel block), SIB (system information block), RACH (random access channel), and paging; Within the active period based on the above cell DTX operation, the signal based on the above setting 2 is transmitted based on the first cycle, Within the non-active period based on the above cell DTX operation, the signal based on the above setting 2 is transmitted based on the second cycle. Method of transmitting and receiving signals.

16. In a base station for transmitting and receiving signals 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 settings (setting 1) for cell DTX (discontinuous transmission) operation and cell DRX (discontinuous reception) operation; and A step of transmitting a setting (setting 2) for one of SSB (synchronization signal / physical broadcast channel block), SIB (system information block), RACH (random access channel), and paging; Within the active period based on the above cell DTX operation, the signal based on the above setting 2 is transmitted based on the first cycle, Within the non-active period based on the above cell DTX operation, the signal based on the above setting 2 is transmitted based on the second cycle. Base station.

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