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

Abstract

The method and apparatus for transmitting and receiving signals in a wireless communication system disclosed in this specification operates based on a cell DTX / DRX setting and a terminal DRX setting. Specifically, the terminal basically monitors the PDCCH during an on-duration of the terminal DRX operation, but when the DTX operation is activated and the serving cell is not in a cell DTX active period, the terminal may not monitor the PDCCH regardless of the on-duration.

Description

[Technical Field]

[0001] The present invention relates to a method and apparatus for use in a wireless communication system. [Background technology]

[0002] Wireless communication systems have been widely deployed to provide various communication services such as voice and data. Generally, wireless communication systems are multiple access systems that support communication with multiple users by sharing available system resources (such as bandwidth and transmission power). Examples of multiple access systems include Code Division Multiple Access (CDMA) systems, Frequency Division Multiple Access (FDMA) systems, Time Division Multiple Access (TDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, and Single Carrier Frequency Division Multiple Access (SC-FDMA) systems. Summary of the Invention [Problem to be solved by the invention]

[0003] A technical problem to be solved by the present invention is to provide a signal transmission / reception method and apparatus for efficiently transmitting and receiving control signals and data signals in a wireless communication system.

[0004] The technical object of the present invention is not limited to the above-mentioned technical object, and other technical objects can be inferred from the embodiments of the present invention. [Means for solving the problem]

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

[0006] As one aspect of the present invention, there is provided a signal transmission / reception method for a terminal in a wireless communication system, the signal transmission / reception method including (comprising; configuring; establishing; setting; including; containing; having); a step of setting a terminal DRX (discontinuous reception) operation and a cell DTX (discontinuous transmission) operation; and a step of monitoring a PDCCH (physical downlink control channel) during an on duration of the terminal DRX operation, but not monitoring the PDCCH regardless of the on duration when the cell DTX operation is activated and the serving cell is not in a cell DTX active period.

[0007] In another aspect of the present invention, there is provided an apparatus, a processor and a storage medium for carrying out the signal transmission and reception method.

[0008] The device includes an autonomous vehicle capable of communicating with at least a terminal, a network, and other autonomous vehicles other than the device.

[0009] The above-described aspects of the present invention are merely some of the preferred embodiments of the present invention, and various embodiments reflecting the technical features of the present invention will be apparent to those skilled in the art based on the detailed description of the present invention below. [Effects of the Invention]

[0010] According to one embodiment of the present invention, when control signals and data signals are transmitted and received between communication devices, there is an advantage that more efficient signal transmission and reception can be achieved through operations differentiated from conventional inventions.

[0011] The technical effects of the present invention are not limited to the above-mentioned technical effects, and other technical effects may be inferred from the embodiments of the present invention. [Brief explanation of the drawings]

[0012] [Figure 1]FIG. 1 is a diagram illustrating the structure of a radio frame. [Figure 2] FIG. 1 illustrates a resource grid of slots. [Figure 3] FIG. 1 is a diagram showing an example of mapping physical channels within a slot. [Figure 4-5] 1 is a diagram illustrating a signal transmission and reception method according to an embodiment of the present invention. [Figure 6-9] 1 illustrates an apparatus according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] The following technologies can be used for various wireless access systems, such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, etc. CDMA can be implemented by radio technologies such as UTRA (Universal Terrestrial Radio Access) and CDMA2000. TDMA can be implemented by radio technologies such as GSM (Global System for Mobile communications), GPRS (General Packet Radio Service), and EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented by radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (Evolved UTRA), etc. UTRA is part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project: registered trademark; the same applies hereinafter) LTE (long term evolution) is a part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A / LTE-A pro are evolved versions of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0014] For clarity, the following description will be based on a 3GPP communication system (e.g., LTE-A, NR), but the technical concept of the present invention is not limited thereto. LTE refers to technology from 3GPP TS 36.xxx Release 8 onward. Specifically, LTE technology from 3GPP TS 36.xxx Release 10 onward is called LTE-A, and LTE technology from 3GPP TS 36.xxx Release 13 onward is called LTE-A pro. 3GPP NR refers to technology from TS 38.xxx Release 15 onward. LTE / NR can also be referred to as a 3GPP system. "xxx" refers to the detailed number of the standard document. LTE / NR is collectively referred to as a 3GPP system. For background technology, terms, abbreviations, etc. used in the description of the present invention, please refer to the matters described in standard documents published before the present invention. For example, the following documents may be referenced:

[0015] 3GPP NR

[0016] - 38.211: Physical channels and modulation

[0017] - 38.212: Multiplexing and channel coding

[0018] - 38.213: Physical layer procedures for control

[0019] - 38.214: Physical layer procedures for data

[0020] - 38.300: NR and NG-RAN Overall Description

[0021] - 38.331: Radio Resource Control (RRC) protocol specification

[0022] FIG. 1 is a diagram illustrating the structure of a radio frame used in NR.

[0023] In NR, uplink and downlink transmissions are composed of frames. A radio frame has a length of 10 ms and is defined as two 5 ms half-frames (HF). A half-frame is defined as five 1 ms 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). If a general CP is used, each slot contains 14 symbols. If an extended CP is used, each slot contains 12 symbols. Here, a symbol can include an OFDM symbol (or a CP-OFDM symbol) or an SC-FDMA symbol (or a DFT-s-OFDM symbol).

[0024] Table 1 illustrates that when a general CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe change depending on the SCS.

[0025] [Table 1]

[0026] Table 2 illustrates how the number of symbols per slot, the number of slots per frame, and the number of slots per subframe change depending on the SCS when an extended CP is used.

[0027] [Table 2]

[0028] In an NR system, multiple cells merged to one user equipment (UE) are configured to have different OFDM(A) pneumatics (e.g., SCS, CP length, etc.), which results in different (absolute time) durations of time resources (e.g., SF, slot, or TTI) (collectively referred to as TU (Time Unit) for convenience) consisting of the same number of symbols.

[0029] NR supports multiple Orthogonal Frequency Division Multiplexing (OFDM) pneumonologies (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 supports dense urban areas, lower latency, and wider carrier bandwidths.

[0030] The NR frequency band is defined by two types of frequency ranges (FR) (FR1 / FR2). FR1 / FR2 are configured as shown in Table 3 below. FR2 also stands for millimeter wave (mmW).

[0031] [Table 3]

[0032] FIG. 2 is a diagram illustrating the slot structure of an NR frame.

[0033] A slot contains multiple symbols in the time domain. For example, in the case of a general CP, one slot contains 14 symbols, while in the case of 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 (or simply, interlaces) are defined in the frequency domain. Interlace m ∈ {0, 1, ..., M-1} consists of (common) RBs {m, M+m, 2M+m, 3M+m, ...}, where M represents the number of interlaces. A BWP (Bandwidth Part) is defined as multiple consecutive PRBs (Physical RBs) in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier contains up to N BWPs (e.g., 5). Data communication is performed using activated BWPs, and only one BWP can be activated for one terminal. Each element in the resource grid is called a resource element (RE), and one modulation symbol can be mapped to it.

[0034] In a wireless communication system, a terminal receives information from a base station via a downlink (DL), and the terminal transmits information to the base station via an uplink (UL). Information exchanged 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 exchanged. A physical channel corresponds to a set of resource elements (RE) that carry information derived from a higher layer. A physical signal corresponds to a set of resource elements (RE) used by a physical layer (PHY), but does not carry information derived from a higher layer. Higher layers include the Medium Access Control (MAC) layer, Radio Link Control (RLC) layer, Packet Data Convergence Protocol (PDCP) layer, and Radio Resource Control (RRC) layer.

[0035] DL physical channels include PBCH (Physical Broadcast channel), PDSCH (Physical Downlink Shared channel), and PDCCH (Physical Downlink Control channel). DL physical signals include DL RS (Reference Signal), PSS (Primary synchronization signal), and SSS (Secondary synchronization signal). DL RSs include DM-RS (Demodulation RS), PT-RS (Phase-tracking RS), and CSI-RS (Channel-state information RS). UL physical channels include PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel), and PUCCH (Physical Uplink Control Channel). UL physical signals include UL RSs. UL RSs include DM-RS, PT-RS, and SRS (Sounding RS).

[0036] FIG. 3 is a diagram showing an example of mapping physical channels within a slot.

[0037] A single slot contains the DL control channel, DL or UL data, and UL control channel. For example, the first N symbols in a slot are used to transmit the DL control channel (hereinafter referred to as the DL control region), and the last M symbols in a slot are used to transmit the UL control channel (hereinafter referred to as the UL control region). N and M are integers equal to or greater than 0. The resource region between the DL control region and the UL control region (hereinafter referred to as the data region) is used to transmit DL data or UL data. A time gap exists between the control region and the data region for DL-to-UL or UL-to-DL switching. The PDCCH is transmitted in the DL control region, and the PDSCH is transmitted in the DL data region. Some symbols at the time of switching from DL to UL within a slot are used as the time gap.

[0038] The base station is, for example, a gNodeB.

[0039] Uplink (UL) physical channels / signals

[0040] (1) PUSCH

[0041] The PUSCH carries uplink data (e.g., UL-SCH TB) and / or uplink control information (UCI) and is transmitted based on a cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) waveform. When the PUSCH is transmitted based on a DFT-s-OFDM waveform, the terminal applies transform precoding to transmit the PUSCH. For example, when transform precoding is not possible (e.g., transform precoding is disabled), the terminal transmits the PUSCH based on the CP-OFDM waveform, and when transform precoding is possible (e.g., transform precoding is enabled), the terminal transmits the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. The PUSCH is dynamically scheduled by the 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 the PDCCH, but in CS, PUSCH transmission is not accompanied by the PDCCH. CS includes Type-1 CG (Configured Grant) PUSCH transmission and Type-2 CG PUSCH transmission. In Type-1 CG, all parameters for PUSCH transmission are signaled by a higher layer. In Type-2 CG, some parameters for PUSCH transmission are signaled by a higher layer, and the rest are signaled by the PDCCH. Basically, in CS, PUSCH transmission is not accompanied by the PDCCH.

[0042] (2) PUCCH

[0043] The PUCCH carries Uplink Control Information (UCI), which includes:

[0044] - SR (Scheduling Request): Information used to request UL-SCH resources

[0045] - HARQ-ACK (Hybrid Automatic Repeat and reQuest Acknowledgement): A reception acknowledgement signal for DL ​​signals (e.g., PDSCH, SPS release PDCCH). HARQ-ACK responses include positive ACK (simply ACK), negative ACK (NACK), DTX (Discontinuous Transmission), or NACK / DTX. HARQ-ACK is also used interchangeably with A / N, ACK / NACK, HARQ-ACK / NACK, etc. HARQ-ACK is generated on a TB-by-TB / CBG-by-CBG basis.

[0046] CSI (Channel Status Information): Feedback information for the DL channel. CSI includes CQI (Channel Quality Information), RI (Rank Indicator), PMI (Precoding Matrix Indicator), PTI (Precoding Type Indicator), etc.

[0047] Downlink (DL) physical channels / signals

[0048] (1) PDSCH

[0049] 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. The CW includes one or more code blocks (CBs). One or more CBs are grouped into a CBG (CB group). Depending on the cell configuration, the 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 undergoes precoding, is mapped to resources along with DMRS, and transmitted from the corresponding antenna port. The PDSCH is dynamically scheduled by the PDCCH (configured scheduling) or semi-statically scheduled (configured scheduling, CS) based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)). Therefore, in dynamic scheduling, PDSCH transmission is accompanied by PDCCH, whereas in CS, PDSCH transmission is not accompanied by PDCCH. CS includes SPS (semi-persistent scheduling).

[0050] (2) PDCCH

[0051] 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 higher layer control messages such as a voluntary access response (RAR) transmitted on the PDSCH, transmit power control commands, and information on activation / deactivation of SPS / CS (Configured Scheduling). Various DCI formats are provided depending on the information in the DCI.

[0052] 1.Cell-specific DTX-DRX operation for energy saving

[0053] The above content can be applied in combination with the method proposed in the present invention, which will be described later, or can be supplemented to clarify the technical features of the method proposed in the present invention.

[0054] In addition, the methods described below are equally applicable to the aforementioned NR system (licensed band) or shared spectrum, and can of course be modified or substituted according to the terms, expressions, structures, etc. defined in each system so that the technical ideas proposed in the present invention can be embodied in those systems as well.

[0055] Energy savings in base stations are an important consideration in wireless communication systems, including 3GPP, as they can contribute to building environmentally friendly networks by reducing carbon emissions and reducing operational expenditures (OPEX) for carriers. In particular, the introduction of 5G communications requires higher transmission rates, which necessitates base stations to be equipped with more antennas and provide services over wider bandwidths and frequency bands. As a result, a recent study estimated that base station energy costs have reached 20% of total OPEX. Due to this growing interest in base station energy savings, a new study item, "study on network energy savings," was approved in 3GPP NR release 18.

[0056] Specifically, in this item, enhancement techniques are considered for the following methods in order to improve the energy saving capability in terms of transmission and reception of a base station.

[0057] - 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 the UE, and potential UE assistance information

[0058] In particular, this specification proposes transmission / reception operations for each signal / channel when a base station performs cell-specific Discontinuous Transmission (DTX) / Discontinuous Reception (DRX) operation in which an active period and a non-active period are periodically repeated for energy saving. Also, this specification proposes transmission / reception operations of a terminal when the operation of the base station is combined with the DRX operation of the terminal.

[0059] When a terminal enters connected mode after initially connecting to a base station, it must continuously monitor the PDCCH to check whether there is a transmission scheduled for it for each configured search space (SS). However, such scheduling does not always exist, and unnecessary PDCCH monitoring each time may quickly drain the terminal's battery. Therefore, the base station can configure a time duration (ON duration) during which PDCCH monitoring should be performed and a time duration (OFF duration) during which PDCCH monitoring is not required for the terminal, and configure connected mode discontinuous reception (C-DRX), which is an operation that reduces the terminal's power. From the base station's perspective, the terminal's C-DRX is useful for ES, but during the C-DRX OFF period of a specific terminal, there is no need to transmit a PDCCH to the terminal, so the resources can be used for other purposes and ES gains can be achieved through DTX / DRX. However, even during OFF periods, a terminal can transmit without restriction as needed using pre-configured resources (e.g., SR, PUCCH, CG-PUSCH, etc.), so the base station must wait for UL reception from the terminal, which may transmit at any time. Furthermore, C-DRX is configured specifically for the terminal. Since the DRX cycles and ON / OFF periods of terminals within a cell are not aligned, if the ON period of a terminal is configured as TDM, the base station must transmit PDCCH during every ON period, preventing it from sleeping, and making it difficult to expect ES gains.

[0060] Cell-specific DTX / DRX operation allows a base station to completely stop transmission / reception during a specific time interval. Alternatively, limited DTX / DRX may be used, allowing only transmission / reception of specific signals / channels. This specification proposes a method for saving energy in a base station through this. Furthermore, a method for operating a terminal during each time interval when cell DTX / DRX is combined with the DRX operation of a terminal within the cell is also proposed. For convenience, the method for combining cell DTX / DRX with the terminal's C-DRX (connected mode DRX) operation and its operation method have been mainly described. However, this method can be applied and extended to other terminal DRX operations (e.g., idle mode DRX) as well as C-DRX.

[0061] In the present invention, a base station operating in an NES mode for ES may refer to, for example, the operation of the base station by presetting multiple OFF intervals (base station DTX intervals) in which the base station turns off transmission of a specific DL signal during a specific time interval and dynamically indicating one of the OFF intervals to indicate that the DL signal will not be transmitted during the predefined time interval, thereby reducing power consumption of the base station and the terminal. Furthermore, a base station operating in an NES mode for ES may also refer to an operation mode in which, not only in the time domain but also in the frequency domain, the base station does not perform transmission and / or reception via a specific receive antenna port of the base station when the specific receive antenna port of the base station is semi-statically or dynamically turned off, thereby reducing power consumption of the base station and the terminal. Furthermore, a base station operating in an NES mode for ES may also refer to an operation mode in which, in the spatial domain, the base station does not perform transmission and / or reception via a specific receive antenna port of the base station when the specific receive antenna port of the base station is semi-statically or dynamically turned off, thereby reducing power consumption of the base station and the terminal.

[0062] The UE periodically monitors the PDCCH during the ON period to check whether there is a DL / UL signal to transmit or receive. When the UE receives the PDCCH during the ON period, it performs DL reception or UL transmission according to the instruction. In the case of UL transmission by the UE, if data exists in the UL buffer, even a UE in sleep mode can wake up and transmit an SR, regardless of C-DRX. A UE in idle mode can operate in idle mode I-DRX (I-DRX), which periodically monitors paging and re-enters sleep mode if it is not the target UE. Here, 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." The "repeated time period consisting of an ON period and an OFF period during C-DRX operation" is defined as a DRX cycle. The length of the DRX cycle is defined as the period from the start of the ON period to just before the start of the next ON period. There are two types of DRX cycles: long and short. If the DRX cycle is long, if a PDSCH that the base station needs to transmit occurs immediately after the end of a specific ON period of the UE, the base station must wait until the next ON period of the UE, which may increase latency. Because the UE does not transmit P-CSI or SRS during the OFF period, the base station can allocate the corresponding resources to other UEs to increase resource utilization. The base station can also switch to energy saving mode to save power during the UE's OFF period.

[0063] Meanwhile, the long DRX cycle and the short DRX cycle can be configured simultaneously. In this case, the long DRX cycle must be configured as an integer multiple of the short DRX cycle (the onDurationTimer values ​​are the same). If there is no data activity during the ON period of the long DRX cycle (e.g., 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. 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 in that cycle. In this case, the start of the ON period of the short DRX cycle is determined by the drx-StartOffset and drx-SlotOffset values, just like the long DRX cycle.

[0064] The base station can use the DRX command MAC CE (control element) to instruct the terminal not to operate in awake mode until the end of the ON period and to immediately enter DRX sleep. That is, the current base station can end the awake time of the terminal and immediately transition to the DRX cycle. If only a long DRX cycle is configured for the terminal, the terminal operates only in the long DRX cycle, and if a short DRX cycle is also configured, the terminal immediately transitions to the short DRX cycle mode after receiving the DRX command MAC CE. Also, if the base station instructs the long DRX command MAC CE, the terminal operates in the long DRX cycle mode even if a short DRX cycle is configured.

[0065] The base station can also adjust the start point of the long DRX cycle using the RRC parameter drx-LongCycleStartOffset. The offset value is defined in ms units so that the long DRX cycle starts from the slot boundary. Furthermore, the start point of the ON period can be set with slot-level granularity using 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 specified from the reference point specified by LongCycleStartOffset. By adjusting the positions of the DRX cycle start point and the ON period start point using 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 based on the base station's dynamic transmission / reception OFF time pattern, a more dynamic offset value may need to be specified.

[0066] By waking up only during the ON interval due to C-DRX configuration and monitoring the presence or absence of a PDCCH transmitted to the terminal, the terminal can achieve ES compared to continuous monitoring of the PDCCH (e.g., every slot). If the base station does not have data to transmit in the terminal's next (upcoming) ON interval, it can transmit a WUS before the start of the terminal's ON interval to inform the terminal that it does not need to wake up during the ON interval (i.e., it does not need to start the duration timer), thereby further conserving the terminal's battery. If the base station does not have data to transmit / receive in the next ON interval for a terminal configured with C-DRX, it can transmit a WUS using DCI format 2_6 at the WUS opportunity set before the ON interval to instruct the terminal that it does not need to wake up during the current ON interval. A terminal that receives this WUS instruction can remain in sleep mode without transitioning to awake mode, thereby achieving more ES.

[0067] [Method #1] Cell DTX / DRX setting and transmission / reception method during inactive periods

[0068] Cell DTX / DRX can be configured with an active cycle and an inactive cycle. The active cycle has a structure similar to the UE's C-DRX and is a cycle in which all signals and channels are transmitted / received without any restrictions. The inactive cycle is a cycle in which all signals and channels are turned off or only certain signals and channels are transmitted / received with limited restrictions. For example, in time intervals other than the active cycle, only PDCCH transmission and reception of RACH / SR PUCCH are allowed. Cell DTX / DRX configuration can be configured and activated only by RRC. Alternatively, some parameters of the cell DTX / DRX configuration can be configured by RRC, while other parameters can be configured / indicated and activated through L1 / L2 signaling (e.g., (group-common) DCI / MAC-CE). Information regarding the location and length of the active and inactive cycles of cell DTX / DRX can be pre-configured through specific RRC parameters. For example, the start position of an active period is set via an offset relative to a specific subframe boundary or a specific SFN value, and the duration is set via a length-related parameter or timer. Alternatively, multiple parameter or timer candidates may be preset, and one of the candidates may be selected upon activation via L1 / L2 signaling. During the cell DTX / DRX active period, all signals and channels can be transmitted / received without any special transmission / reception restrictions, similar to normal base station operation. Time intervals outside the active period are essentially considered inactive periods, and restrictions may be placed on transmission / reception of signals and channels other than those preset. Because the base station can achieve ES gains through such minimal transmission / reception operations, cell DTX / DRX-related operations can also be considered operations when the NES state / mode is ON.

[0069] The following options can be considered for the base station's transmission / reception operation method during the cell DTX / DRX inactivity period:

[0070] [Table 4]

[0071] Option 1 is a method in which the base station turns off the transmission / reception of all signals and channels during inactive periods. This includes the transmission / reception of data traffic and reference signals such as SSB, CSI-RS, and SRS. Option 2 is a method in which only the transmission / reception related to data traffic transmitted through dynamically scheduled or pre-configured resources is turned off, while reference signals such as SSB, CSI-RS, and SRS continue to be transmitted and received even during inactive periods. Option 3 is an operation method in which only the transmission / reception of dynamically scheduled PDSCH and PUSCH is turned off, while the transmission / reception of SPS, CG-PUSCH, SR, RACH, and SRS transmitted through pre-configured resources continues. Option 4 is a method in which all data traffic and reference signal reception is turned off during inactive periods, and only reference signals are transmitted. Option 5 is a method in which the base station pre-configures the signals / channels to be turned on / off during inactive periods during cell DTX / DRX operation, and only the signals / channels set to be on are allowed to be transmitted / received. The operation method of the base station in the inactive period is not limited to the above-mentioned options, and various cell DTX / DRX patterns are possible, such as a combination of specific options according to the setting / instruction, or applying different options for each time period. For example, by setting in advance, it is possible to configure the base station so that, based on a specific point in time such as SFN=0, option 1 operates in odd-numbered inactive periods and option 2 operates in even-numbered inactive periods.

[0072] On the other hand, if the base station receives a specific signal (e.g., RACH or SR) from the terminal within the pre-agreed active period, or after scheduling retransmission to the terminal, the base station may extend the period of the initially set active period and slightly delay the start of the inactive period for the RACH procedure message or PDSCH scheduling or retransmission / reception.

[0073] [Method #2] How to turn DTX / DRX on / off and operate for each cell or cell group

[0074] A specific cell or cell group may be semi-statically configured with one of the inactive periodic operation options or a combination of options from [Method #1] described above as the inactive periodic operation through cell DTX / DRX configuration, and one of the options may be dynamically activated for each cell or cell group through L1 / L2 signaling (e.g., (Group-common) DCI / MAC-CE). That is, when multiple cells are configured for a terminal, cell DTX / DRX configuration can be configured and activated for each cell or cell group. Therefore, when a specific cell or cell group is switched from normal operation to an NES mode / state for ES (or vice versa), cell DTX / DRX operation can be turned on / off for each cell or cell group.

[0075] In this case, RRC parameters and timers related to the cell DTX / DRX maintenance time can be configured / instructed for each cell or cell group. Cell DTX / DRX operation is maintained for that time, and for a cell / cell group for which the timer expires, cell DTX / DRX is turned off (deactivated) and the base station returns to normal base station operation mode, allowing all signals and channels to be transmitted / received without restrictions. Alternatively, for a cell / cell group for which deactivation is configured / instructed while cell DTX / DRX operation is being maintained, cell DTX / DRX is turned off (deactivated) and the base station returns to normal base station operation mode, allowing all signals and channels to be transmitted / received without restrictions. Furthermore, if there is no separate configuration / instruction related to the maintenance time, cell DTX / DRX operation may be maintained in an active state until a separate instruction is received from the base station.

[0076] [Method #3] How to configure and operate the cell DTX / DRX settings in conjunction with the UE C-DRX

[0077] The base station may configure multiple UE C-DRX settings for a terminal when configuring C-DRX for the terminal in advance, taking into consideration the interrelationship between a specific cell DTX / DRX setting and a UE C-DRX setting for each cell / cell group. When a specific cell DTX / DRX setting is activated by RRC / L1 / L2 signaling, a UE C-DRX setting that is linked to the cell DTX / DRX setting among the UE C-DRX settings configured in the terminal may be automatically activated. For example, when UE C-DRX setting #1 and UE C-DRX setting #2 are configured for a terminal in a specific cell, only UE C-DRX setting #2 is linked to cell DTX / DRX setting #1. In this case, when the cell operates in normal mode (i.e., when performing normal operation rather than NES operation), UE C-DRX setting #1 is applied and the terminal operates. After that, when cell DTX / DRX setting #1 is activated, the C-DRX setting is switched to UE C-DRX setting #2 linked to the cell DTX / DRX setting, and the terminal operates. In this case, the UE C-DRX configuration #2 can be configured for multiple UEs within a cell. To maximize the ES gain of the base station, the starting point and length of the activation / deactivation period of the cell DTX / DRX configuration can be configured to be aligned with the starting point and length of the DRX cycle or the ON period within the DRX cycle of the UE C-DRX configuration #2. Alternatively, when the cell DTX / DRX configuration is activated, predetermined drx-StartOffset and drx-SlotOffset values ​​are applied to UEs in the cell with C-DRX configured, so that the DRX cycles or the ON periods within the DRX cycles of different UEs can be aligned. Alternatively, for each cell / cell group, a specific cell DTX / DRX can be automatically switched in conjunction with a specific DRX group (e.g., an NES group) among multiple DRX groups configured in the UE. Alternatively, for each cell / cell group, the DRX parameters configured for the conventional primary / secondary DRX groups can be adapted to a specific cell DTX / DRX.In this case, the base station can maximize ES gain by aggregating PDCCHs to be transmitted to multiple terminals in a cell group on the time axis, transmitting them briefly during the active period of cell DTX / DRX operation and the ON period of UE C-DRX operation, and performing only minimal transmission / reception during the inactive period and the OFF period.If the base station operates multiple cell DTX / DRX setting patterns, it can link individual / independent UE DRX setting #2 for each cell / cell group DTX / DRX pattern, and when a specific cell DTX / DRX is activated, it can switch the UE DRX setting to the UE DRX setting #2 linked to that cell DTX / DRX.

[0078] [Method #4] Terminal operation method according to the combination of active / inactive time when cell DTX / DRX setting and UE C-DRX setting are simultaneously operating

[0079] When both cell DTX / DRX and UE C-DRX are configured in a UE, a time interval may occur in which the cell DTX / DRX active / inactive time and the UE C-DRX ON / OFF period are combined. The {Cell DTX / DRX, UE C-DRX} combination can be configured as four time intervals: {ON, ON}, {ON, OFF}, {OFF, ON}, and {OFF, OFF}. In each case, the UE's operation can be defined differently. For example, when {Cell DTX / DRX, UE C-DRX} is {ON, ON}, the base station operates in a normal operation mode (non-NES mode), and the UE can perform operations (e.g., PDCCH monitoring) and transmission / reception operations such as CSI reporting that were previously performed in the ON period when the UE C-DRX was ON during the base station's cell DTX / DRX active period. In addition, conventionally, when a UE receives a PDCCH during an ON period of UE C-DRX, an inactivity timer operates, or if the UE needs to perform a retransmission, the time for maintaining the UE's active state is extended by a drx-Retransmission Timer (drx-RetransmissionTimerDL / UL). When cell DTX / DRX are both configured and applied simultaneously, the extension of the UE C-DRX active time can be configured to be possible until the end of the cell DTX / DRX active time.

[0080] When {Cell DTX / DRX, UE C-DRX} is {ON, OFF}, the UE can perform transmission and reception operations during the cell DTX / DRX active period that were previously possible in the UE C-DRX OFF period. For example, reception and measurement of SSB / CSI-RS, and transmission and reception of pre-configured signals and channels such as SPS, CG-PUSCH, SR, RACH, and SRS are allowed.

[0081] When {Cell DTX / DRX, UE C-DRX} is set to {OFF, ON}, the terminal may not expect to receive reference signals such as SSB / CSI-RS, may not perform measurements and reports, or may not transmit SPS, CG-PUSCH, SR, RACH, and SRS on pre-configured resources, according to the base station's operation options for inactive periods pre-configured for each cell / cell group. That is, the transmission and reception operations for each signal and channel that were previously possible during the ON / OFF periods of the UE C-DRX configuration may differ depending on the operation configuration for the inactive period of the cell DTX / DRX. For example, if the cell DTX / DRX configuration is set to option 2 in [Method #1], the terminal may not expect to receive PDCCH even during the ON period of the UE C-DRX configuration. Instead, the terminal may transmit and receive only reference signals such as SSB, CSI-RS, and SRS.

[0082] Similarly, when {Cell DTX / DRX, UE C-DRX} is {OFF, OFF}, the terminal's behavior may differ depending on the cell DTX / DRX setting. For example, when option 1 of [Setting #1] is set, even if the terminal's C-DRX setting is in the OFF section, the terminal does not expect any DL / UL transmission / reception including signals and channels transmitted on pre-configured resources including reference signals, and can maintain a sleep state until the cell DTX / DRX activation time arrives.

[0083] [Method #5] When multiple cells are configured and operating in a terminal, a method for indicating activation / deactivation of cell DTX / DRX of a specific cell via group-common DCI (or group-common MAC-CE), and a method for configuring and transmitting PUCCH resources for HARQ-ACK feedback

[0084] When multiple cells are configured in a terminal in a CA (carrier aggregation) or DC (dual connectivity) scenario, activation or deactivation of cell DTX / DRX setting (ON / OFF pattern) for each cell can be indicated via group common DCI or MAC-CE.

[0085] In this case, the group-common DCI or group-common MAC-CE for indicating activation / deactivation of cell DTX / DRX can be configured to include N bits or bit groups. Here, the value of N can be predefined or configured (for the terminal) by the base station. For a serving cell configured for the terminal, a correspondence relationship regarding which bit (bit group) of the N bits (or bit group) indicates activation / deactivation of cell DTX / DRX (ON / OFF pattern) for which cell can be configured by the base station (for the terminal).

[0086] When the terminal receives the group-common DCI or MAC-CE, it interprets the bits (groups) corresponding to each cell set in the terminal, and can perform transmission and reception operations on the cell according to the activation / deactivation of the cell DTX / DRX (ON / OFF pattern) indicated by the corresponding bits (groups).

[0087] When the base station indicates a cell index through a group common MAC CE, the terminal may receive the following configuration through RRC.

[0088] - N_B:Max number of cell index bits in MAC CE

[0089] - N_C:Number of configured cells for cell DRX / DTX

[0090] - Bit position for configured cells

[0091] In this case, when N_B≧N_C and the terminal receives the above-mentioned configuration through RRC, the MAC layer can perform the following operations.

[0092] [Table 5]

[0093] Meanwhile, as described above, if the base station instructs the activation / deactivation of the cell DTX / DRX configuration through the group-common DCI or group-common MAC CE, but the terminal fails to correctly receive the instruction (e.g., due to missing DCI or decoding failure), misalignment may occur between the transmission and reception operations of the base station and the terminal, resulting in losses in terms of energy conservation of the base station or the terminal. For example, if the base station instructs the activation of cell DTX / DRX and the terminal pre-configures the transmission of a specific DL signal / channel to be OFF during the cell DTX inactive period, but the terminal fails to correctly receive the instruction, the terminal may continue monitoring in the hope of receiving the signal. Alternatively, the base station may set the transmission of a specific UL signal / channel to OFF during the cell DRX inactive period, but the terminal may continue to perform UL transmission. Therefore, when the terminal receives an instruction to activate / deactivate cell DTX / DRX through the group-common (GC) DCI / MAC CE, the terminal may transmit HARQ-ACK feedback to reduce the problem of misalignment between the base station and the terminal.

[0094] When instructing (de)activation using a group-common DCI or MAC-CE, the base station may pre-configure a separate PUCCH resource or PUCCH resource set (which may be different from the PUCCH resource (set) configured for HARQ-ACK feedback for general unicast PDSCH reception) for the terminal to feedback whether the instruction has been correctly received. Alternatively, the base station may directly indicate a PUCCH resource for transmitting the HARQ-ACK (from among multiple resources belonging to the separate PUCCH resource set) through the GC-DCI / MAC CE instructing (de)activation. Furthermore, if a separate PUCCH resource (set) for transmitting the HARQ-ACK in response to receiving the (de)activation is not configured, the terminal may transmit the HARQ-ACK using the already configured PUCCH resource configuration (e.g., the PUCCH resource or resource set configured for transmitting the HARQ-ACK for general unicast PDSCH reception).

[0095] Specifically, if the GC DCI or MAC-CE for indicating (de)activation of cell DTX / DRX configuration indicates a cell index that is not configured by RRC, or if there is no change in the activation / deactivation state of a cell index that the UE should monitor (configured / invalid) (for example, if a deactivation instruction is received in a deactivated state), or if all configured cells are in a deactivated state, the UE may not transmit HARQ-ACK feedback. In such cases, whether to transmit HARQ-ACK may be configured / instructed / defined (in a standard, etc.) in advance.

[0096] However, the present invention is not limited to application in 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 concept of a base station in the present invention includes not only a base station but also a relay node. For example, the operation of a base station in the present invention may be performed by a base station, or may be performed by a relay node.

[0097] An example of the proposed method described above can also be included as one of the methods for implementing the present invention, and is therefore recognized as a type of proposed method. The proposed methods described above may be implemented independently, or may be implemented in the form of a combination (or merging) of some of the proposed methods. Rules can be defined so that information regarding whether the proposed method described above is applied (or information regarding the rules of the proposed method) is notified by a base station to a terminal or by a transmitting terminal to a receiving terminal via a predefined signal (e.g., a physical layer signal or an upper layer signal).

[0098] DRX (Discontinuous Reception) operation

[0099] A terminal can perform DRX operation while executing the above-described / proposed procedures and / or methods. A terminal configured for DRX can reduce power consumption by discontinuously receiving DL signals. DRX is performed in the RRC (Radio Resource Control)_IDLE state, RRC_INACTIVE state, and RRC_CONNECTED state. DRX in the RRC_IDLE state and RRC_INACTIVE state is used to discontinuously receive paging signals. DRX performed in the RRC_CONNECTED state (RRC_CONNECTED DRX) will be described below.

[0100] FIG. 4 illustrates a DRX cycle (RRC_CONNECTED state).

[0101] Referring to FIG. 4, a DRX cycle consists of On Duration and Opportunity for DRX. The DRX cycle defines a time interval during which On Duration is periodically repeated. On Duration indicates a time period during which the UE monitors to receive the PDCCH. When DRX is configured, the UE monitors the PDCCH during On Duration. If a PDCCH is successfully detected during PDCCH monitoring, the UE operates an inactivity timer and maintains an awake state. On the other hand, if a PDCCH is not successfully detected during PDCCH monitoring, the UE enters a sleep state after On Duration expires. Therefore, when DRX is configured, PDCCH monitoring / reception is performed discontinuously in the time domain when performing the above-described / proposed procedures and / or methods. For example, when DRX is configured, in the present invention, PDCCH reception opportunities (e.g., slots having a PDCCH search space) are configured discontinuously according to the DRX configuration. On the other hand, when DRX is not configured, PDCCH monitoring / reception is performed continuously in the time domain. For example, if DRX is not configured, PDCCH reception opportunities (e.g., slots having PDCCH search spaces) are configured consecutively in the present invention. On the other hand, regardless of whether DRX is configured, PDCCH monitoring may be restricted in the time interval configured as the measurement gap.

[0102] Table 6 shows the process of the UE related to DRX (RRC_CONNECTED state). Referring to Table 6, DRX configuration information is received via higher layer (e.g., RRC) signaling, and DRX ON / OFF is controlled by a DRX command of the MAC layer. When DRX is configured, the UE can perform PDCCH monitoring discontinuously when performing the procedures and / or methods described / proposed in the present invention, as shown in FIG.

[0103] [Table 6]

[0104] Here, MAC-CellGroupConfig includes configuration information required to set MAC (Medium Access Control) parameters for a cell group. MAC-CellGroupConfig may also include configuration information related to DRX. For example, MAC-CellGroupConfig includes the following information in the definition of DRX:

[0105] - Value of drx-OnDurationTimer: Defines the length of the start period of the DRX cycle

[0106] - Value of drx-InactivityTimer: defines the length of the time interval during which the UE is in an awake state after a PDCCH opportunity in which a PDCCH indicating initial UL or DL ​​data is detected.

[0107] - Value of drx-HARQ-RTT-TimerDL: Defines the length of the maximum time interval between when a DL initial transmission is received and when a DL retransmission is received.

[0108] - Value of drx-HARQ-RTT-TimerDL: Defines the maximum time interval between the reception of a grant for an UL initial transmission and the reception of a grant for an UL retransmission.

[0109] -drx-LongCycleStartOffset: Defines the length and start of a DRX cycle

[0110] drx-ShortCycle(optional): defines the time length of the short DRX cycle

[0111] Here, if any one of the drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, and drx-HARQ-RTT-TimerDL is operating, the terminal performs PDCCH monitoring at every PDCCH opportunity while maintaining an awake state.

[0112] Example

[0113] FIG. 5 is a flowchart illustrating a signal transmission and reception method according to an embodiment of the present invention.

[0114] Referring to FIG. 5, an embodiment of the present invention is performed by a terminal and may include a step of setting a terminal DRX operation and a cell DTX operation (S501), a step of monitoring a PDCCH during an ON period of the terminal DRX operation (S503), and a step of transmitting a PUSCH including a CSI report based on a measurement result for a CSI-RS (S405).

[0115] In addition to the operations of FIG. 5, one or more of the operations described in Section 1 may additionally be performed.

[0116] For example, referring to Method #4, the active / inactive time combination of {Cell DTX, UE C-DRX} can be configured with four time intervals, such as {ON, ON}, {ON, OFF}, {OFF, ON}, and {OFF, OFF} (ON means active time, OFF means inactive time). In particular, when the {Cell DTX, UE C-DRX} combination is {OFF, ON}, the base station is in an inactive time but the terminal is in an active time, which can raise an issue as to whether the terminal monitors or receives signals as in the past.

[0117] Generally, when the DRX operation of a terminal is activated and the terminal is in an active time including an on duration, the terminal monitors the PDCCH. However, if the cell DTX operation of the base station is activated but the serving cell is not in the cell DTX active time (or active period), if the base station transmits the PDCCH prioritizing the terminal operation, the base station may not be able to expect ES gain. As mentioned above, since the DRX operation is configured UE-specific and activated for each terminal, if the on duration of the terminal is configured in TDM mode, the base station must transmit the PDCCH in all periods, making the cell DTX operation meaningless.

[0118] Taking this into consideration, method #4 proposes that the terminal basically monitors the PDCCH during the on-period of DRX operation, but does not monitor the PDCCH regardless of the on-period when cell DTX operation is activated and the serving cell is not in the cell DTX active period.

[0119] However, if the cell DTX operation is set to option 2 of method #1, the terminal can receive reference signals in the on duration even when the cell DTX operation is activated and the serving cell is not in the cell DTX active period. However, if the cell DTX operation is activated and the serving cell is not in the cell DTX active period, the terminal does not receive downlink data (e.g., DL-SCH) on the SPS resource.

[0120] When cell DTX operation is activated and the serving cell is in a cell DTX active period, the UE monitors the PDCCH during the on period as in the conventional method. If the PDCCH is received during the on period, the UE can operate the inactivity timer and maintain the awake state. However, when the cell DTX is in an inactive period, the UE does not monitor the PDCCH, and therefore the awake state can only be maintained during the cell DTX active period.

[0121] In addition to the operations described in connection with FIG. 5, one or more of the operations described through FIGS. 1 to 4 and / or the operations described in Section 1 may be combined and performed additionally.

[0122] An example of a communication system to which the present invention is applied

[0123] Without being limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or flow charts of the present invention disclosed in this specification may be applied to various fields requiring device-to-device wireless communication / connection (e.g., 5G).

[0124] Hereinafter, a more detailed description will be given with reference to the drawings. In the following drawings / description, the same reference numerals indicate the same or corresponding hardware blocks, software blocks or function blocks unless otherwise specified.

[0125] FIG. 6 is a diagram illustrating a communication system 1 to which the present invention is applied.

[0126] Referring to FIG. 6, a communication system 1 applicable to the present invention includes wireless devices, base stations, and a network. Here, the wireless devices refer to devices that communicate using wireless connection technologies (e.g., 5G NR, LTE), and are also referred to as communication / wireless / 5G devices. The wireless devices include, but are not limited to, a robot 100a, vehicles 100b-1 and 100b-2, an XR (eXtended Reality) device 100c, a handheld device 100d, a home appliance 100e, an IoT (Internet of Things) device 100f, and an AI server / device 400. For example, the vehicles include vehicles equipped with wireless communication capabilities, autonomous vehicles, vehicles capable of vehicle-to-vehicle communication, and the like. Here, the vehicles include unmanned aerial vehicles (UAVs) (e.g., drones). XR devices include Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR) devices, and are embodied in the form of Head-Mounted Devices (HMDs), Head-Up Displays (HUDs) mounted on vehicles, TVs, smartphones, computers, wearable devices, home appliances, digital billboards, vehicles, robots, etc. Mobile devices include smartphones, smart pads, wearable devices (e.g., smart watches, smart glasses), computers (e.g., laptops, etc.), etc. Home appliances include TVs, refrigerators, washing machines, etc. IoT devices include sensors, smart meters, etc. For example, base stations and networks may also be embodied as wireless devices, and a specific wireless device 200a may operate as a base station / network node for other wireless devices.

[0127] The wireless devices 100a to 100f are connected to a network 300 via a base station 200. Artificial Intelligence (AI) technology is applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f are connected to an AI server 400 via the network 300. The network 300 is configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices 100a to 100f can communicate with each other via the base station 200 / network 300, but can also communicate directly without going through the base station / network (e.g., sidelink communication). For example, vehicles 100b-1 and 100b-2 can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). IoT devices (e.g., sensors) can also communicate directly with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0128] Wireless communication / connections 150a, 150b, and 150c are performed between the wireless devices 100a to 100f and the base stations 200, and between the base stations 200. Here, the wireless communication / connections are performed using various wireless connection technologies such as uplink / downlink communication 150a and sidelink communication 150b (or D2D communication), and communication between base stations 150c (e.g., relay, Integrated Access Backhaul (IAB)) (e.g., 5G NR). Through the wireless communication / connections 150a, 150b, and 150c, the wireless devices and the base stations, and the base stations, can transmit / receive wireless signals to / from each other. For example, the wireless communication / connections 150a, 150b, and 150c can transmit / receive signals via various physical channels. To this end, according to various proposals of the present invention, any one of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes is performed.

[0129] Examples of wireless devices to which the present invention is applied

[0130] FIG. 7 is a diagram illustrating a wireless device to which the present invention can be applied.

[0131] 7, a first wireless device 100 and a second wireless device 200 transmit and receive wireless signals using various wireless access technologies (e.g., LTE, NR). Here, {first wireless device 100, second wireless device 200} corresponds to {wireless devices 100a-100f, base station 200} and / or {wireless devices 100a-100f, wireless devices 100a-100f} in FIG. 6.

[0132] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and further includes one or more transceivers 106 and / or one or more antennas 108. The processor 102 is configured to control the memory 104 and / or the transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 102 processes information in the memory 104 to generate first information / signals and then transmits a wireless signal including the first information / signals via the transceiver 106. The processor 102 also receives a wireless signal including a second information / signal via the transceiver 106 and then stores information obtained from signal processing of the second information / signals in the memory 104. The memory 104 is coupled to the processor 102 and stores various information related to the operation of the processor 102. For example, the memory 104 stores software code including instructions for performing some or all of the processes controlled by the processor 102 or for implementing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 102 and memory 104 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 106 is coupled to the processor 102 and transmits and / or receives wireless signals via one or more antennas 108. The transceiver 106 includes a transmitter and / or a receiver. The transceiver 106 may also be referred to as an RF (radio frequency) unit. In the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0133] The second wireless device 200 includes one or more processors 202 and one or more memories 204, and further includes one or more transceivers 206 and / or one or more antennas 208. The processor 202 is configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 202 processes information in the memory 204 to generate third information / signal, and then transmits a wireless signal including the third information / signal via the transceiver 206. The processor 202 also receives a wireless signal including a fourth information / signal via the transceiver 206, and then stores information obtained from signal processing of the fourth information / signal in the memory 204. The memory 204 is coupled to the processor 202 and stores various information related to the operation of the processor 202. For example, the memory 204 stores software code including instructions for performing some or all of the processes controlled by the processor 202 or for implementing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 202 and memory 204 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 206 is coupled to the processor 202 and transmits and / or receives wireless signals via one or more antennas 208. The transceiver 206 includes a transmitter and / or a receiver. The transceiver 206 may also be referred to as an RF unit. In the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0134] The hardware elements of the wireless device 100, 200 are described in more detail below. Without limitation, 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, and SDAP). The 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, suggestions, methods, and / or flowcharts disclosed herein. The one or more processors 102, 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. The one or more processors 102, 202 generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, suggestions, and / or methods disclosed herein and provide them to the one or more transceivers 106, 206. The one or more processors 102, 202 receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and obtain the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein.

[0135] The one or more processors 102, 202 may also be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. For example, the one or more processors 102, 202 may include 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). The descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be implemented using firmware or software, and the firmware or software may be embodied to include modules, procedures, functions, etc. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be included in the one or more processors 102, 202 or may be stored in one or more memories 104, 204 and executed by the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and / or flow charts disclosed in this specification may be embodied using firmware or software in the form of code, instructions and / or sets of instructions.

[0136] The one or more memories 104, 204 may be coupled to the one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, code, instructions, and / or instructions. The one or more memories 104, 204 may be comprised of 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 internal and / or external 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 techniques, such as wired or wireless connections.

[0137] One or more transceivers 106, 206 can transmit user data, control information, wireless signals / channels, etc., as referenced in the methods and / or flowcharts herein to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, wireless signals / channels, etc., as referenced in the descriptions, functions, procedures, suggestions, methods and / or flowcharts herein from one or more other devices. For example, one or more transceivers 106, 206 can be coupled 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. Also, one or more processors 102, 202 can control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. Furthermore, one or more transceivers 106, 206 are coupled to one or more antennas 108, 208 and are configured to transmit and receive user data, control information, radio signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein via the one or more antennas 108, 208. In this specification, one or more antennas may refer to multiple physical antennas or multiple logical antennas (e.g., antenna ports). The one or more transceivers 106, 206 convert the received user data, control information, radio signals / channels, etc., from RF band signals to baseband signals for processing by one or more processors 102, 202. The one or more transceivers 106, 206 convert the user data, control information, radio signals / channels, etc., processed by one or more processors 102, 202, from baseband signals to RF band signals. For this purpose, the one or more transceivers 106, 206 include (analog) oscillators and / or filters.

[0138] Examples of use of wireless devices to which this invention is applied

[0139] 8 is a diagram showing another example of a wireless device to which the present invention is applied. The wireless device may be implemented in various forms depending on the use case / service (see FIG. 6).

[0140] Referring to Figure 8, wireless devices 100, 200 correspond to the wireless devices 100, 200 of Figure 7 and are composed of various elements, components, units / sections, and / or modules. For example, the wireless devices 100, 200 include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140. The communication unit includes a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 includes one or more processors 102, 202 and / or one or more memories 104, 204 in Figure 7. For example, the transceiver 114 includes one or more transceivers 106, 206 and / or one or more antennas 108, 208 in Figure 7. The control unit 120 is electrically coupled to the communication unit 110, the memory unit 130, and the additional element 140 and controls the overall operation of the wireless device. For example, the control unit 120 controls the electrical / mechanical operations of the wireless device based on the programs / codes / instructions / information stored in the memory unit 130. The control unit 120 also transmits the information stored in the memory unit 130 to the outside (e.g., another communication device) via the communication unit 110 via a wireless / wired interface, or stores information received from the outside (e.g., another communication device) via the communication unit 110 via a wireless / wired interface in the memory unit 130.

[0141] The additional element 140 may be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include any one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computer unit. Wireless devices may be embodied in the form of, but are not limited to, a robot ( FIG. 6 , 100a), a vehicle ( FIG. 6 , 100b-1, 100b-2), an XR device ( FIG. 6 , 100c), a mobile 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 financial device), a security device, a climate / environment device, an AI server / device ( FIG. 6 , 400), a base station ( FIG. 6 , 200), a network node, etc. Wireless devices may be mobile or fixed depending on the use case / service.

[0142] In FIG. 8, the various elements, components, units / sections and / or modules within the wireless devices 100, 200 are all connected to each other by wired interfaces or at least some are connected wirelessly by a communication section 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first unit (e.g., 130, 140) are connected wirelessly via the communication unit 110. Furthermore, each element, component, unit / part and / or module in the wireless devices 100 and 200 further includes one or more elements. For example, the control unit 120 is configured with a set of one or more processors. For example, the control unit 120 is configured with a set of a communication control processor, an application processor, an ECU (Electronic Control Unit), a graphics processor, a memory control processor, etc. As another example, the memory unit 130 is configured with a RAM (Random Access Memory), a DRAM (Dynamic RAM), a ROM (Read Only Memory), a flash memory, a volatile memory, a non-volatile memory and / or a combination thereof.

[0143] Examples of vehicles or autonomous vehicles that can be used with the present invention

[0144] 9 is a diagram illustrating an example of a vehicle or an autonomous vehicle to which the present invention is applied. The vehicle or the autonomous vehicle may be embodied as a mobile robot, a car, a train, an aerial vehicle (AV), a ship, etc.

[0145] 9, a vehicle or autonomous vehicle 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 is configured as part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in FIG. 8, respectively.

[0146] The communication unit 110 transmits and receives signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, roadside units, etc.), and servers. The control unit 120 controls elements of the vehicle or autonomous vehicle 100 to perform various operations. The control unit 120 includes an ECU (Electronic Control Unit). The driving unit 140a causes the vehicle or autonomous vehicle 100 to move on the ground. The driving unit 140a includes an engine, a motor, a powertrain, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and includes wired / wireless charging circuits, a battery, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c includes an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / reverse 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 implements technology for maintaining a lane while driving, technology for automatically adjusting speed such as adaptive cruise control, technology for automatically driving along a predetermined route, technology for automatically setting a route and driving when a destination is set, etc.

[0147] For example, the communication unit 110 receives map data, traffic information data, etc. from an external server. The autonomous driving unit 140d generates an autonomous driving route and a driving plan based on the obtained data. The control unit 120 controls the driving unit 140a (e.g., adjusting speed / direction) so that the vehicle or autonomous vehicle 100 moves along the autonomous driving route according to the driving plan. The communication unit 110 aperiodically obtains the latest traffic information data from an external server during autonomous driving and also obtains surrounding traffic information data from surrounding vehicles. The sensor unit 140c also obtains vehicle status and surrounding environment information during autonomous driving. The autonomous driving unit 140d updates the autonomous driving route and driving plan based on the newly obtained data / information. The communication unit 110 transmits information regarding the vehicle position, autonomous driving route, driving plan, etc. to an external server. The external server can predict traffic information data using AI technology based on information collected from the vehicle or autonomous vehicle and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0148] It is obvious to those skilled in the art that the present invention can be embodied in other specific forms without departing from the characteristics of the present invention. Therefore, the above detailed description should not be construed as limiting in all respects, but should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

[0149] [Industrial Applicability] As mentioned above, the present invention can be applied to a variety of wireless communication systems.

[0150] [Claims at the time of international application] [Claim 1] A method for a terminal to transmit and receive signals in a wireless communication system, comprising: Setting a terminal DRX (discontinuous reception) operation and a cell DTX (discontinuous transmission) operation; monitoring a physical downlink control channel (PDCCH) during an on duration of the UE DRX operation; and not monitoring the PDCCH regardless of the on duration when the cell DTX operation is activated and the serving cell is not in a cell DTX active period. [Claim 2] The signal transmission and reception method of claim 1, further comprising: receiving a reference signal in the on interval regardless of whether the cell DTX operation is activated and the serving cell is not in the cell DTX active period. [Claim 3] 2. The signal transmission and reception method of claim 1, further comprising: monitoring the PDCCH during the on duration based on the cell DTX operation being activated and the serving cell being in the cell DTX active period. [Claim 4] 2. The signal transmission and reception method according to claim 1, further comprising: a step of not receiving downlink data in an SPS (semi-persistent scheduling) resource based on the cell DTX operation being activated and the serving cell not being in the cell DTX active period. [Claim 5] The method further includes: operating an inactivity timer based on the reception of a PDCCH during the on duration, and maintaining an awake state; The signal transmission and reception method according to claim 1 , wherein the awake state is maintained within the cell DTX activity period. [Claim 6] A terminal for transmitting and receiving signals in a wireless communication system, comprising: at least one transceiver; at least one processor; and at least one memory operatively connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform certain operations; The specific operation is: setting terminal DRX (discontinuous reception) operation and cell DTX (discontinuous transmission) operation; monitoring a physical downlink control channel (PDCCH) during an on duration of the UE DRX operation; and The terminal includes: not monitoring the PDCCH regardless of the on duration when the cell DTX operation is activated and the serving cell is not in a cell DTX active period. [Claim 7] The signal transmission and reception method of claim 1, further comprising: receiving a reference signal in the on interval regardless of whether the cell DTX operation is activated and the serving cell is not in the cell DTX active period. [Claim 8] 2. The signal transmission and reception method of claim 1, further comprising: monitoring the PDCCH during the on duration based on the cell DTX operation being activated and the serving cell being in the cell DTX active period. [Claim 9] 2. The signal transmission and reception method according to claim 1, further comprising: a step of not receiving downlink data in an SPS (semi-persistent scheduling) resource based on the cell DTX operation being activated and the serving cell not being in the cell DTX active period. [Claim 10] The method further includes: operating an inactivity timer based on the reception of a PDCCH during the on duration, and maintaining an awake state; The signal transmission and reception method according to claim 1 , wherein the awake state is maintained within the cell DTX activity period. [Claim 11] 1. An apparatus for a terminal, comprising: at least one processor; and at least one computer memory operatively connected to the at least one processor and that, when executed, causes the at least one processor to perform operations; The operation is setting terminal DRX (discontinuous reception) operation and cell DTX (discontinuous transmission) operation; monitoring a physical downlink control channel (PDCCH) during an on duration of the UE DRX operation; and not monitoring the PDCCH regardless of the on duration based on the cell DTX operation being activated and the serving cell not being in a cell DTX active period. [Claim 12] A computer-readable non-volatile storage medium containing at least one computer program that causes at least one processor to perform operations, The actions are: Setting a terminal DRX (discontinuous reception) operation and a cell DTX (discontinuous transmission) operation; Monitoring a physical downlink control channel (PDCCH) during an on duration of the UE DRX operation; and not monitoring the PDCCH regardless of the on duration based on the cell DTX operation being activated and the serving cell not being in a cell DTX active period.

Claims

1. A method for a terminal to transmit and receive signals in a wireless communication system, comprising: setting a terminal DRX (discontinuous reception) operation and a cell DTX (discontinuous transmission) operation; Monitoring a physical downlink control channel (PDCCH) during an on duration of the UE DRX operation; and not monitoring the PDCCH regardless of the on duration when the cell DTX operation is activated and the serving cell is not in a cell DTX active period.

2. The signal transmission and reception method of claim 1 , further comprising: receiving a reference signal during the on interval regardless of whether the cell DTX operation is activated and the serving cell is not in the cell DTX active period.

3. The signal transmission and reception method of claim 1 , further comprising: monitoring the PDCCH during the on duration based on the cell DTX operation being activated and the serving cell being in the cell DTX active period.

4. 2. The signal transmission and reception method of claim 1, further comprising: not receiving downlink data in a semi-persistent scheduling (SPS) resource based on the cell DTX operation being activated and the serving cell not being in the cell DTX active period.

5. and further comprising: operating an inactivity timer based on the reception of a PDCCH during the on duration to maintain an awake state; The signal transmission and reception method according to claim 1 , wherein the awake state is maintained within the cell DTX active period.

6. A terminal for transmitting and receiving signals in a wireless communication system, comprising: at least one transceiver; at least one processor; and at least one memory operatively connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform certain operations; The specific operation is: setting a terminal DRX (discontinuous reception) operation and a cell DTX (discontinuous transmission) operation; Monitoring a physical downlink control channel (PDCCH) during an on duration of the UE DRX operation; and not monitoring the PDCCH regardless of the on duration based on the cell DTX operation being activated and the serving cell not being in a cell DTX active period.

7. The signal transmission and reception method of claim 1 , further comprising: receiving a reference signal during the on interval regardless of whether the cell DTX operation is activated and the serving cell is not in the cell DTX active period.

8. The signal transmission and reception method of claim 1 , further comprising: monitoring the PDCCH during the on duration based on the cell DTX operation being activated and the serving cell being in the cell DTX active period.

9. 2. The signal transmission and reception method of claim 1, further comprising: not receiving downlink data in a semi-persistent scheduling (SPS) resource based on the cell DTX operation being activated and the serving cell not being in the cell DTX active period.

10. and further comprising: operating an inactivity timer based on reception of a PDCCH during the on duration to maintain an awake state; The signal transmission and reception method according to claim 1 , wherein the awake state is maintained within the cell DTX active period.

11. 1. An apparatus for a terminal, comprising: at least one processor; and at least one computer memory operatively connected to said at least one processor and that, when executed, causes said at least one processor to perform operations; The operation is setting a terminal DRX (discontinuous reception) operation and a cell DTX (discontinuous transmission) operation; Monitoring a physical downlink control channel (PDCCH) during an on duration of the UE DRX operation; and not monitoring the PDCCH regardless of the on duration based on the cell DTX operation being activated and the serving cell not being in a cell DTX active period.

12. A computer-readable non-volatile storage medium containing at least one computer program that causes at least one processor to perform operations, The operations are: setting a terminal DRX (discontinuous reception) operation and a cell DTX (discontinuous transmission) operation; Monitoring a physical downlink control channel (PDCCH) during an on duration of the terminal DRX operation; and not monitoring the PDCCH regardless of the on duration based on the cell DTX operation being activated and the serving cell not being in a cell DTX active period.

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