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

Abstract

A method and an apparatus for transmitting and receiving signals in a wireless communication system disclosed in the present specification comprise receiving DCI for a cell DTX / DRX configuration and activation / deactivation of the cell DTX / DRX configuration. Specifically, the DCI for activation / deactivation of the cell DTX / DRX configuration may be received via a paging occasion (PO).

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: receiving a configuration for a cell DTX (discontinuous transmission) operation and a cell DRX operation; and receiving DCI (downlink control information) for activating and deactivating the cell DTX operation and the cell DRX operation; wherein, based on the terminal not being in RRC_CONNECTED mode, the DCI is received through a PO (paging occasion) or a CORESET (control resource set) for a type 0 CSS (common search space) set.

[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 settings for a cell DTX (discontinuous transmission) operation and a cell DRX operation; and a step of transmitting DCI (downlink control information) for activating and deactivating the cell DTX operation and the cell DRX operation; wherein, based on the terminal not being in RRC_CONNECTED mode, the DCI is transmitted through a PO (paging occasion) or a CORESET (control resource set) for a type 0 CSS (common search space) set.

[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 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.

[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. Cell DTX-DRX operation for idle and inactive UEs

[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 operational expenditures (OPEX) for 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] - A method for achieving more efficient operation by dynamically and / or semi-statically and finer granularity adaptation of transmissions and / or receptions in one or more 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, the latency may increase due to this RRC signaling. 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] In addition, the base station can adjust the starting point of the long DRX cycle through the RRC parameter drx-LongCycleStartOffset, and the offset value is defined so that the long DRX cycle can start at the slot boundary in ms units. In addition, the starting point of the ON period can be set with slot level granularity through another RRC parameter drx-SlotOffset. The start of the ON period is defined as the relative position of the ON period by applying the slot offset indicated from the reference point indicated by LongCycleStartOffset. By adjusting the positions of the starting point of the DRX cycle and the starting point of the ON period through the above parameters, the base station can align the ON and OFF periods of multiple terminals within the cell and utilize them for ES operation. However, for ES through the dynamic transmission / reception OFF time pattern of the base station, a more dynamic offset value indication may be required.

[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] A method of instructing cell DTX / DRX (de)activation to idle / inactive mode terminals within the cell through L1 signaling such as PDCCH (UE-specific DCI or group-common DCI).

[0098] (1) Method of instructing (de)activation through DCI scheduling SIB1

[0099] Within a cell, terminals can receive PBCH via SSB and configure time / frequency domain resource allocation information of CORESET 0 via MIB information. CORESET 0 is a CORESET for receiving SIB1 PDCCH / DCI, and terminals can schedule SIBs via the corresponding CORESET information within the Type 0 PDCCH common search space. Having previously received cell DTX / DRX configurations from the base station, terminals can receive activation or deactivation instructions for cell DTX and / or cell DRX configurations via specific fields / bits within the PDCCH / DCI (which schedules SIBs) transmitted to the Type 0 PDCCH common search space. At this time, specific fields / bits within the DCI may be configured by reusing previously used fields / bits, or newly added fields / bits may be used. Since the DCI scheduling SIB1 can be commonly received by terminals connected within the cell, it can be used to indicate activation / deactivation of cell DTX and / or cell DRX settings without configuring a separate PDCCH search space set.

[0100] Additionally, DCIs scheduling other SI (system information) in a Type 0A CSS (common search space) set and DCIs scheduling MBS (Multicast and Broadcast Services) in a Type 0B CSS set may also instruct UEs in idle / inactive mode to activate / deactivate cell DTX / DRX settings, similar to DCIs scheduling SIB1.

[0101] (2) Method of instructing (de)activation through paging DCI

[0102] In LTE, since SI update information was contained in the paging PDSCH message, when the UE received the paging PDCCH from the PO, it had to decode the PDSCH to check the SI update information and receive SIB1. In NR, there is no need to decode the PDSCH for SI update. Instead, two types of SI update information can be indicated through a short message field masked with a P-RNTI in the PDCCH. A 1-bit field contains information that there is a general SI update, and this 1-bit field is used as an instruction to receive the SI update information in the next modification period. Another 1-bit field contains modification information such as ETWS or CMAS that cannot wait for the next modification period, and this 1-bit field is used as an instruction to update the SI immediately without waiting for the modification period. However, in both cases, the short message does not indicate which SIB to receive, so the UE must receive SIB1 to determine which SIB has updated information, and then check other SI scheduling information to update other SI.

[0103] Meanwhile, an idle / inactive mode terminal may receive an activation / deactivation instruction for the cell DTX / DRX configuration set via a specific field / bit in the paging DCI, which was configured via a connected mode or SIB (e.g., SIB1). The instruction may be configured by reusing fields / bits previously used in a paging message or short message, or newly added fields / bits may be used.

[0104] (3) How to instruct (de)activation through group-common DCI

[0105] Since cell DTX / DRX settings are commonly applied to all terminals within a cell, it may be more efficient in terms of signaling overhead and DCI size alignment to indicate activation / deactivation through group-common DCI rather than UE-specific DCI. It may be possible to consider extending the existing DCI format (e.g., DCI format 2_0 to 2_7) or DCI format 2_9, which is used to indicate activation / deactivation of cell DTX / DRX settings for connected mode terminals, to idle / inactive mode terminals.

[0106] For DCI format 2_7, it is used to notify one or more idle / inactive mode terminals of PEI (paging early indication) and TRS (tracking reference signal) availability indication. PEI-RNTI is used for DCI format 2_7. The terminal can read the bit of the corresponding subgroup in the paging indication field to determine whether to skip the next PO. Among idle / inactive mode terminals, terminals with DCI format 2_7 set perform monitoring of DCI format 2_7 in front of their own POs, so for idle / inactive mode terminals, previously used fields / bits in DCI format 2_7 can be reused, or a cell DTX / DRX configuration (de)activation indication can be performed through newly added fields / bits.

[0107] For example, while a legacy UE reads only the bits in the position corresponding to its own subgroup among the fields / bits constituting DCI format 2_7, a method may be considered in which a NES-capable UE reads not only some bits but also the entire field bits (e.g., the entire paging indication field, the entire TRS availability indication field, or a combination of the two) to determine whether to activate or deactivate the cell DTX / DRX configuration. Another method may be considered in which a new group (e.g., R19 NES capable UE) is defined in addition to the subgroups for the legacy PO, and the paging indication bits of the corresponding group are interpreted as cell DTX / DRX activation / deactivation indications.

[0108] Meanwhile, GC-DCI (i.e., DCI format 2_9), which is used to indicate cell DTX / DRX (de)activation to connected mode terminals, can also be utilized to indicate idle / deactivated mode terminals. For example, for DCI format 2_9, the PDCCH monitoring configuration and the field configuration and / or sub-field configuration within the DCI format may differ between idle / deactivated mode terminals and connected mode terminals. For example, parameters related to the starting position of fields / bits that idle / deactivated mode terminals should read within DCI may be configured through upper layer signals. Alternatively, if a specific offset is added to the parameters related to the starting position for a connected mode terminal to read cell DTX / DRX configuration activation / deactivation indication for each serving cell, the added position may be interpreted as the position of the (de)activation indication for idle / deactivated mode terminals.

[0109] (4) How to set MO considering PO or PEI opportunities

[0110] In the above methods, if the existing SIB1 PDCCH, paging DCI, and GC-DCI are reused, additional MO configuration may not be required. In order to instruct idle / inactive mode UEs to activate or deactivate cell DTX / DRX configuration through separate L1 signaling (which may be additional SIB1 PDCCH / paging DCI / GC-DCI), an additional MO configuration (i.e., PDCCH search space set) that can monitor idle / inactive mode UEs may be required. However, if an MO for (de)activating cell DTX / DRX configuration is additionally configured in addition to the MO for monitoring paging DCI and DCI format 2_7 (i.e., PEI) for idle / inactive mode UEs, the UE and base station must wake up more frequently to perform monitoring, which may relatively reduce sleep time and energy saving benefits. Therefore, when configuring MO, the burden on terminals and base stations can be reduced by maximizing the use of PO or PEI opportunities that existing idle / inactive mode terminals must monitor. For example, the MO of L1 signaling indicating activation / deactivation of cell DTX / DRX settings can be configured in FDM or TDM with PO or PEI opportunities. In the case of TDM, the M of L1 signaling can be configured consecutively immediately before or after the existing PO or PEI opportunity. Alternatively, the MO can be configured after a specific (slot / symbol unit) offset compared to the existing PO or PEI opportunity.

[0111] (5) Terminal operation when (de)activated DCI is not detected in MO

[0112] Idle / inactive mode UEs with configured cell DTX / DRX settings can monitor the activation / deactivation instructions in the pre-arranged MO and act upon the instructions when DCI is received. However, if the base station does not need to change the activation / deactivation state, sending DCI for each MO can reduce signaling overhead and energy savings. On the other hand, since the UE may not detect the DCI in the MO (including cases where the base station did not send it) or may fail to decode it, it is necessary to define the UE behavior in such cases. In the case of DCI format 2_7, the default behavior of the UE is to skip PO when DCI is not detected in a PEI opportunity. In the case of DCI format 2_6, the base station can pre-set the default behavior of the UE when DCI is not detected, for example, the UE can be set to skip the on duration of the corresponding DRX cycle.

[0113] For MO for activating / deactivating cell DTX / DRX configuration of a terminal in idle / inactive mode, the default operation is defined or can be configured by the base station to maintain the existing activated or deactivated state if DCI is not detected in the MO. This can mean that the DCI is transmitted only when the base station changes the activated state to deactivated state or vice versa. Or, conversely, when DCI is not detected, the default operation is defined or can be configured by the base station to switch from activated state to deactivated state or from deactivated state to activated state. Specifically, a method in which the terminal skips transmission / reception of signals / channels included in the cell DTX / DRX configuration within a preset time interval or a subsequent paging cycle as the default operation can also be considered.

[0114] (6) When applying when receiving cell DTX / DRX (de)activation instruction / setting

[0115] When a terminal receives an (in)activation instruction / configuration of cell DTX / DRX configuration (in case of RRC-only activation or deactivation), a certain amount of delay may be required until the actual cell DTX / DRX pattern is applied immediately after DCI reception. Since the cell DTX / DRX configuration is common to all terminals in the cell, a certain amount of delay may be required for alignment between terminals in the cell. In addition, unless the terminal provides HARQ-ACK feedback, the terminal may not receive the DCI sent by the base station, which may cause misalignment in understanding of cell DTX / DRX operations between the base station and the terminal. Considering this, the activation or deactivation instruction may be transmitted from multiple MOs.

[0116] That is, in case the terminal does not receive the (group-common) DCI indication, the base station can transmit the (group-common) DCI indication multiple times in multiple MOs. In this case, the reference time or application delay, which is the point in time when the actual cell DTX / DRX configuration is applied, needs to be determined. Even if the base station does not separately set the reference time or application delay, the terminal can activate / deactivate the cell DTX / DRX configuration after a preset time (e.g., 2 slots) based on the last MO in the MO group if the (group-common) DCI indication is received in at least one MO in the preset MO group. Through this method, the base station can align the activation / deactivation start points of the cell DTX / DRX configuration among terminals even if the timing at which the terminals receive the (group-common) DCI is different in the cell. Specifically, in the case of deactivation, the terminal can apply the deactivation immediately after receiving the GC-DCI, regardless of the GC-DCI reception timing.

[0117] More generally, the terminal may be configured with multiple candidate (de)activation points in advance (which may be configured periodically), and upon receiving an activation or deactivation GC-DCI indication from a specific MO, the terminal may (de)activate the cell DTX / DRX at the closest of the configured candidate (de)activation points. In the case of deactivation, the terminal may apply the deactivation immediately upon receiving the GC-DCI indication.

[0118] Specifically, when DCI for activation / deactivation in a specific MO is received, the UE may apply the actual cell DTX / DRX configuration in the next modification cycle. The modification cycle can be set to the basic DRX cycle included in the SIB or (basic DRX cycle) / N or (modified cycle) / N.

[0119] [Method #2] RRC state transition of the terminal or Cell DTX / DRX (de)activation linked to the RRC state

[0120] Method #2 may include the following methods:

[0121] (1) How to (de)activate the currently activated cell DTX / DRX settings when the RRC state of the terminal is switched.

[0122] (2) A method in which the activated cell DTX / DRX settings in a specific RRC state are maintained regardless of the RRC state transition of the terminal (a list of signals / channels to be turned ON / OFF for each RRC state can be set differently within one cell DTX / DRX setting)

[0123] Below is a detailed description of methods (1) and (2) of method #2.

[0124] The base station can initiate an RRC connection release process to transition the terminal in RRC_CONNECTED state to RRC_IDLE state, and the terminal can also request an RRC connection release process to the base station. The terminal can maintain the cell DTX / DRX settings set in connected mode as they are (RRC release) even if the RRC state changes. Alternatively, the terminal can deactivate the cell DTX / DRX settings that are in activated state or activate the cell DTX / DRX settings that were inactivated when its RRC state changes.

[0125] Meanwhile, if there are separate cell DTX / DRX settings for each RRC state (which may be multiple cell DTX / DRX configurations), for example, if cell DTX / DRX settings for idle / inactive mode and cell DTX / DRX settings for connected mode are respectively set, when the RRC state switches from connected mode to idle mode, the cell DTX / DRX setting that is already activated may be deactivated and the cell DTX / DRX setting for idle / inactive mode may be activated. Or, conversely, when an idle / inactive mode terminal switches to connected mode, the cell DTX / DRX setting for idle / inactive mode may be deactivated and the cell DTX / DRX setting for connected mode may be activated. In other words, the cell DTX / DRX setting may be switched automatically (according to a preset / promise) depending on the RRC state transition.

[0126] A terminal can be configured with multiple cell DTX / DRX settings, and an RRC state to be applied to each cell DTX / DRX setting can be configured together. Alternatively, a single cell DTX / DRX setting may include parameters to be applied in connected mode and parameters to be applied in idle / inactive mode. For example, cell DTX / DRX setting #1 that can be applied only in idle mode, cell DTX / DRX setting #2 that can be applied in both connected mode and idle / inactive mode, and cell DTX / DRX setting #3 that can be applied only in connected mode can be configured. In this case, each cell DTX / DRX setting may have different types and numbers of signals / channels that are not transmitted / received during the OFF period. In addition, parameters such as the length and starting offset of the ON / OFF period may be different for each cell DTX / DRX setting.

[0127] Meanwhile, the cell DTX / DRX settings set for the terminal may be applied equally (e.g., the same ON / OFF pattern is applied) regardless of the RRC state. In this case, the cell DTX / DRX settings activated in a specific RRC state may be maintained even if the RRC state of the terminal is switched. In this case, the list of signals / channels to be turned ON / OFF for each RRC state may be set differently within one cell DTX / DRX setting.

[0128] 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.

[0129] 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).

[0130] Implementation example

[0131] Figure 5 is a flowchart of a signal transmission and reception method according to embodiments of the present invention.

[0132] Referring to FIG. 5, embodiments of the present invention can be performed by a terminal and can be configured to include (i) a step of receiving settings for a cell DTX operation and a cell DRX operation (S501), and a step of receiving DCI for activating and deactivating the cell DTX operation and the cell DRX operation (S503).

[0133] Other embodiments of the present invention may be performed by a base station and may be configured to include a step (S501) of transmitting settings for cell DTX operation and cell DRX operation, and a step (S503) of transmitting DCI for activation and deactivation of the cell DTX operation and the cell DRX operation.

[0134] In addition to the operations of FIG. 5, one or more of the operations described in Section 1 may be additionally performed.

[0135] For example, referring to section (1) of method #1, for a terminal that is not in RRC_CONNECTED mode, DCI for activating and deactivating cell DTX operation and cell DRX operation can be transmitted and received through CORESET (CORESET#0) for type 0 CSS set. Referring to section (2) of method #1, for a terminal that is not in RRC_CONNECTED mode, DCI for activating and deactivating cell DTX operation and cell DRX operation can be transmitted and received through PO.

[0136] Referring to clauses (1) to (3) of method #1, the DCI may be a DCI for scheduling a PDSCH including SIB1, may be a paging DCI masked with a P-RNTI, or may be another group common DCI. As an example of the group common DCI, the DCI may be DCI format 2_7 masked with a PEI-RNTI. Alternatively, the DCI may be DCI format 2_9, which is a DCI used for activating and deactivating cell DTX operation and cell DRX operation of terminals in RRC_CONNECTED mode.

[0137] However, the method by which a terminal reads each DCI may differ from the conventional method of reading the corresponding DCI. For example, a certain bit group of bits of a conventional group common DCI may be for a first terminal, and another bit group may be for a second terminal. Accordingly, the information bits of the group common DCI may be organized into N subgroups for N terminals. In this situation, a terminal that is not in RRC_CONNECTED mode can check all bits, not just the subgroups applicable to it, and determine whether to activate or deactivate cell DTX operation and cell DRX operation.

[0138] Additionally, referring to section (5) of method #1, if DCI is not detected in MO, the terminal can maintain the existing enabled or disabled state of each of cell DTX operation and cell DRX operation, or transition to a state different from the current state. Combining this with section (2), since the MO that monitors DCI is the same as PO, the terminal can maintain the existing enabled or disabled state of each of cell DTX operation and cell DRX operation, or transition to a state different from the current state, if DCI is not detected in PO.

[0139] In addition, referring to clause (6) of method #1, activation and deactivation of cell DTX operation and cell DRX operation can be applied from a certain point in time after receiving DCI. When the terminal receives DCI from one MO within a pre-configured MO group, the terminal can activate / deactivate the cell DTX operation and cell DRX operation after a pre-configured time based on the last MO within the MO group. When this is combined with clause (2), since the MO that monitors DCI is the same as the PO, the terminal can activate / deactivate the cell DTX operation and cell DRX operation after a pre-configured time based on the last PO within the PO group when the terminal receives DCI from one PO within a pre-configured PO group.

[0140] Alternatively, considering timing alignment between terminals, when a terminal receives DCI from one PO within a pre-configured PO group, the cell DTX operation and / or cell DRX operation may be activated after a pre-configured time based on the last PO within the PO group. On the other hand, in case of deactivation of the cell DTX operation and cell DRX operation, the cell DTX operation and / or cell DRX operation may be deactivated by the terminal immediately after reception of the DCI is completed, without considering timing alignment between terminals.

[0141] 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.

[0142] Examples of communication systems to which the present invention is applied

[0143] 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.

[0144] 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.

[0145] Figure 6 illustrates a communication system (1) applied to the present invention.

[0146] 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.

[0147] 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).

[0148] 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.

[0149] Examples of wireless devices to which the present invention is applied

[0150] Figure 7 illustrates a wireless device applicable to the present invention.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] Examples of wireless devices to which the present invention is applied

[0159] 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).

[0160] 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).

[0161] 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.

[0162] 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.

[0163] Examples of vehicles or autonomous vehicles to which the present invention is applied

[0164] 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.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] 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 settings for cell DTX (discontinuous transmission) operation and cell DRX (discontinuous reception) operation; and A step of receiving DCI (downlink control information) for activating and deactivating the cell DTX operation and the cell DRX operation; Based on the above terminal not being in RRC_CONNECTED mode, the DCI is received via CORESET (control resource set) for PO (paging occasion) or type 0 CSS (common search space) set. Method of transmitting and receiving signals.

2. In paragraph 1, The above DCI is a DCI for scheduling a PDSCH (physical downlink shared channel) including SIB1 (system information block1). Method of transmitting and receiving signals.

3. In paragraph 1, The above DCI is masked with P-RNTI (Paging-Radio Network Temporary Identifier). Method of transmitting and receiving signals.

4. In paragraph 1, The above DCI is a group-common DCI, Method of transmitting and receiving signals.

5. In paragraph 4, The above DCI is masked with PEI-RNTI (Paging Early Indication-Radio Network Temporary Identifier). Method of transmitting and receiving signals.

6. In paragraph 4, Whether to activate or deactivate the cell DTX operation and the cell DRX operation is determined based on the bits of the subgroup for the terminal and the subgroup for other terminals within the DCI. Method of transmitting and receiving signals.

7. In paragraph 4, The above DCI is in the same format as the DCI for activating and deactivating cell DTX operation and cell DRX operation of a terminal in RRC_CONNECTED mode. Method of transmitting and receiving signals.

8. In paragraph 1, If the DCI is not received from the PO or the CORESET, the existing enabled or disabled state of the cell DTX operation and the cell DRX operation is maintained. Method of transmitting and receiving signals.

9. In paragraph 1, The cell DTX operation or the cell DRX operation is activated after a preset time based on the last PO in the PO group including the above PO. Method of transmitting and receiving signals.

10. In paragraph 9, Immediately after the reception of the DCI in the PO is completed, the cell DTX operation and the cell DRX operation are deactivated. Method of transmitting and receiving signals.

11. 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 settings for cell DTX (discontinuous transmission) operation and cell DRX operation; and A step of receiving DCI (downlink control information) for activating and deactivating the cell DTX operation and the cell DRX operation; Based on the above terminal not being in RRC_CONNECTED mode, the DCI is received via CORESET (control resource set) for PO (paging occasion) or type 0 CSS (common search space) set. Terminal.

12. 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 settings for cell DTX (discontinuous transmission) operation and cell DRX operation; and A step of receiving DCI (downlink control information) for activating and deactivating the cell DTX operation and the cell DRX operation; Based on the above terminal not being in RRC_CONNECTED mode, the DCI is received via CORESET (control resource set) for PO (paging occasion) or type 0 CSS (common search space) set. device.

13. 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 settings for cell DTX (discontinuous transmission) operation and cell DRX operation; and A step of receiving DCI (downlink control information) for activating and deactivating the cell DTX operation and the cell DRX operation; Based on the above terminal not being in RRC_CONNECTED mode, the DCI is received via CORESET (control resource set) for PO (paging occasion) or type 0 CSS (common search space) set. Storage media.

14. In a method for a base station to transmit and receive signals in a wireless communication system, A step of transmitting settings for cell DTX (discontinuous transmission) operation and cell DRX operation; and A step of transmitting DCI (downlink control information) for activating and deactivating the cell DTX operation and the cell DRX operation; Based on the above terminal not being in RRC_CONNECTED mode, the DCI is transmitted via CORESET (control resource set) for PO (paging occasion) or type 0 CSS (common search space) set. Method of transmitting and receiving signals.

15. 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 for cell DTX (discontinuous transmission) operation and cell DRX operation; and A step of transmitting DCI (downlink control information) for activating and deactivating the cell DTX operation and the cell DRX operation; Based on the above terminal not being in RRC_CONNECTED mode, the DCI is transmitted via CORESET (control resource set) for PO (paging occasion) or type 0 CSS (common search space) set. Base station.

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