Method and apparatus for transmitting and receiving uplink and downlink channels - Patents.com

Abstract

The present disclosure relates to a method for a terminal to transmit an uplink (UL) signal or receive a downlink (DL) signal in a wireless communication system, in particular, the method includes receiving information about at least one first time interval that is unavailable, and transmitting the UL signal or receiving the DL signal by at least one second time interval that is not the at least one first time interval, in which the UL signal is not transmitted and the DL signal is not received during the at least one first time interval, and the information about the at least one first time interval is received by a downlink control information (DCI) or a medium access control-control element (MAC-CE).

Description

[Technical field]

[0001] The present disclosure relates to a method and apparatus for transmitting and receiving uplink and downlink channels, and more particularly, to a method and apparatus for informing a terminal of ON / OFF for each of one or more time intervals for NES (Network Energy Saving), and transmitting and receiving DL (Downlink) / UL (Uplink) channels based on the ON / OFF for each of the one or more time intervals. [Background technology]

[0002] As the times change, more communication devices will require larger communication traffic, and next-generation 5G systems, which provide improved wireless broadband communication compared to conventional LTE systems, are required. In the next-generation 5G system, called NewRAT, communication scenarios are divided into Enhanced Mobile BroadBand (eMBB) / Ultra-Reliability and Low-Latency Communication (URLLC) / Massive Machine-type Communications (mMTC), etc.

[0003] Here, eMBB is a next-generation mobile communication scenario having characteristics such as High Spectrum Efficiency, High User Experienced Data Rate, and High Peak Data Rate, URLLC is a next-generation mobile communication scenario having characteristics such as Ultra Reliability, Ultra Low Latency, and Ultra High Availability (e.g., V2X, Emergency Service, Remote Control), and mMTC is a next-generation mobile communication scenario having characteristics such as Low Cost, Low Energy, Short Packet, and Massive Connectivity (e.g., IoT). Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides a method and apparatus for transmitting and receiving uplink and downlink channels.

[0005] The technical problems to be achieved by the present disclosure are not limited to the above technical problems, and other technical problems not mentioned will be clearly understood by a person having ordinary skill in the art to which the present invention pertains from the following description. [Means for solving the problem]

[0006] In a wireless communication system according to the present disclosure, a method for a terminal to transmit an uplink (UL) signal or receive a downlink (DL) signal includes receiving information regarding at least one first time interval that is not available, and transmitting the UL signal or receiving the DL signal by at least one second time interval that is not the at least one first time interval, during which the UL signal is not transmitted and the DL signal is not received, and the information regarding the at least one first time interval is received by a downlink control information (DCI) or a medium access control-control element (MAC-CE).

[0007] The at least one first time interval is then one of a plurality of first time intervals that is not available, the information being known.

[0008] Additionally, the at least one first time interval is at least one symbol indicated as unavailable by a Slot Format Indicator (SFI).

[0009] Also, the at least one second time interval is at least one symbol after a timer corresponding to the at least one first time interval expires.

[0010] In addition, the DL signal is received and the UL signal is transmitted in the at least one first time interval based on whether the DL signal is a Synchronization Signal Block (SSB) or a Channel State Information-Reference Signal (CSI-RS), or whether the UL signal is a Physical Random Access Channel (PRACH).

[0011] Further, based on monitoring a PDCCH (Physical Downlink Control Channel) in the at least one first time interval, a period of a Search Space (SS) set for the at least one first time interval is longer than a period of an SS set for the at least one second time interval.

[0012] In addition, the information regarding the at least one first time interval is intended to indicate a pattern consisting of the at least one first time interval and the at least one second time interval, and information regarding a duration to which the pattern is applied is received together by the DCI or the MAC-CE.

[0013] In addition, UL transmission or DL ​​reception is performed in the time resources after the end of the period.

[0014] Also, after the end of the period, UL transmission or DL ​​reception is performed based on another pattern different from the pattern and a period corresponding to the other pattern.In a wireless communication system according to the present disclosure, a terminal for transmitting an uplink (UL) signal or receiving a downlink (DL) signal includes at least one transceiver, at least one processor, and at least one memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, the operations including receiving, by the at least one transceiver, information regarding at least one unavailable time period, and transmitting, by the at least one transceiver, the UL signal or receiving, by a time period other than the at least one time period, during which the UL signal is not transmitted or the DL signal is not received, and the information regarding the at least one time period is received by a downlink control information (DCI) or a medium access control-control element (MAC-CE).

[0015] The at least one interval is then one of a plurality of time intervals that are not available, as determined by the information.

[0016] Additionally, the at least one time interval is at least one symbol that is indicated as unavailable by a Slot Format Indicator (SFI).

[0017] Also, the time interval that is not the at least one time interval is at least one symbol after a timer corresponding to the at least one time interval expires.

[0018] In addition, the DL signal is received and the UL signal is transmitted in at least one time period based on whether the DL signal is a Synchronization Signal Block (SSB) or a Channel State Information-Reference Signal (CSI-RS), or whether the UL signal is a Physical Random Access Channel (PRACH).

[0019] Further, based on monitoring a PDCCH (Physical Downlink Control Channel) in the at least one time interval, a period of a Search Space (SS) set for the at least one time interval is longer than a period of an SS set for a time interval other than the at least one time interval.

[0020] In addition, the information regarding the at least one first time interval is intended to indicate a pattern consisting of the at least one first time interval and the at least one second time interval, and information regarding a duration to which the pattern is applied is received together by the DCI or the MAC-CE.

[0021] In addition, UL transmission or DL ​​reception is performed in the time resources after the end of the period.

[0022] After the end of the period, UL transmission or DL ​​reception is performed based on another pattern different from the above pattern and the period corresponding to the other pattern.

[0023] In a wireless communication system according to the present disclosure, a method for a base station to receive an uplink (UL) signal or transmit a downlink (DL) signal includes transmitting information regarding at least one time interval that is unavailable, and receiving the UL signal or transmitting the DL signal by a time interval other than the at least one time interval, during which the UL signal is not received and the DL signal is not transmitted, and the information regarding the at least one time interval is transmitted by downlink control information (DCI) or medium access control-control element (MAC-CE).

[0024] In a wireless communication system according to the present disclosure, a base station for receiving an uplink (UL) signal or transmitting a downlink (DL) signal includes at least one transceiver, at least one processor, and at least one memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, the operations including transmitting, by the at least one transceiver, information regarding at least one time interval that is not available, and receiving, by the at least one transceiver, the UL signal or transmitting, by a time interval that is not the at least one time interval, during which the UL signal is not received and the DL signal is not transmitted, and the information regarding the at least one time interval is transmitted by a downlink control information (DCI) or a medium access control-control element (MAC-CE).

[0025] A computer-readable storage medium including at least one computer program causing at least one processor to perform operations according to the present disclosure, the operations including receiving information regarding at least one time interval that is unavailable and transmitting the UL signal or receiving the DL signal in a time interval that is not the at least one time interval, during which the UL signal is not transmitted and the DL signal is not received, and the information regarding the at least one time interval is received by a Downlink Control Information (DCI) or a Medium Access Control-Control Element (MAC-CE).

[0026] In a wireless communication system according to the present disclosure, an apparatus for transmitting an Uplink (UL) signal or receiving a Downlink (DL) signal includes at least one processor and at least one memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, the operations including receiving information regarding at least one time interval that is not available, and transmitting the UL signal or receiving the DL signal by a time interval that is not the at least one time interval, during which the UL signal and the DL signal are not transmitted and received, respectively, and the information regarding the at least one time interval is received by a Downlink Control Information (DCI) or a Medium Access Control-Control Element (MAC-CE). Effect of the Invention

[0027] According to the present disclosure, for the NES operation of a base station, a method is proposed in which DL / UL channels are transmitted and received dynamically, rather than semi-statically, depending on the ON / OFF of one or more time periods, thereby reducing power consumption of the base station and terminal.

[0028] In addition, by defining a penalty differently from the conventional penalty when a terminal fails to receive a response to a PRACH (Physical Random Access Channel) / SR (Scheduling Request) during the OFF time period, transmission and reception optimized for the NES mode can be performed.

[0029] In addition, by proposing a method for a terminal that does not support NES operation to connect to a base station in NES mode, legacy terminals can also operate efficiently in NES mode.

[0030] The effects obtained by the present disclosure are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Brief description of the drawings]

[0031] [Figure 1] 1 is a diagram illustrating physical channels used in a 3GPP (registered trademark) system, which is an example of a wireless communication system, and a general signal transmission method using these channels. [Diagram 2] FIG. 2 illustrates an example of a radio frame structure. [Diagram 3] FIG. 2 illustrates a resource grid of slots. [Figure 4] FIG. 1 is a diagram for explaining DCI format 2_0. [Diagram 5] FIG. 1 is a diagram for explaining network energy saving. [Figure 6] A diagram for explaining the overall operation process of a terminal and a base station according to an embodiment of the present disclosure. [Figure 7] A diagram for explaining the overall operation process of a terminal and a base station according to an embodiment of the present disclosure. [Figure 8] A diagram for explaining the overall operation process of a terminal and a base station according to an embodiment of the present disclosure. [Figure 9] FIG. 13 is a diagram for explaining an example of an ON / OFF pattern according to an embodiment of the present disclosure. [Figure 10] FIG. 1 is a diagram illustrating a communication system to which the present disclosure is applied; [Figure 11] FIG. 1 illustrates an example of a wireless device applicable to the present disclosure. [Figure 12] FIG. 1 illustrates an example vehicle or autonomous vehicle applicable to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] The following technologies can be used for various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA can be implemented by radio technologies such as Universal Terrestrial Radio Access (UTRA) and CDMA2000. TDMA can be implemented by radio technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented by radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), etc. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A is an evolution of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolution of 3GPP LTE / LTE-A.

[0033] For clarity of explanation, the 3GPP communication system (e.g., NR) will be mainly described, but the technical idea of ​​the present disclosure is not limited thereto. For background technology, terms, abbreviations, etc. used in the description of the present disclosure, reference can be made to matters described in standard documents published before the present disclosure (e.g., 38.211, 38.212, 38.213, 38.214, 38.300, 38.331, etc.).

[0034] Here, we will explain 5G communications including NR systems.

[0035] The three main requirement areas for 5G include (1) the Enhanced Mobile Broadband (eMBB) area, (2) the massive Machine Type Communication (mMTC) area, and (3) the Ultra-reliable and Low Latency Communications (URLLC) area.

[0036] Some use cases may require multiple areas for optimization, while others may focus on just one key performance indicator (KPI). 5G will support these use cases in a flexible and reliable way.

[0037] eMBB goes far beyond basic mobile Internet access to cover rich two-way work, cloud or augmented reality media and entertainment applications. Data is one of the core drivers of 5G and for the first time in the 5G era, dedicated voice services may not be seen. In 5G, voice is expected to be handled simply as an application using the data connection provided by the communication system. The main causes of the increased traffic volume are the increase in content size and the increase in the number of applications that require high data transmission rates. Streaming services (audio and video), conversational video and mobile Internet connections will become more widely used as more devices connect to the Internet. Many such applications require always-on connectivity to push real-time information and notifications to users. Cloud storage and applications are proliferating on mobile communication platforms, applicable to both business and entertainment. Cloud storage is also a special use case that drives the growth of uplink data transmission rates. 5G will also be used for cloud remote work, which requires lower end-to-end latency so that a good user experience can be maintained when haptic interfaces are used. Entertainment, such as cloud gaming and video streaming, is another key element that will increase the demand for mobile broadband capabilities. Entertainment is a must on smartphones and tablets everywhere, including in highly mobile environments such as trains, cars and planes. Another use case is augmented reality and information retrieval for entertainment, where augmented reality requires very low latency and instantaneous data volume.

[0038] Also, one of the most anticipated use cases for 5G is its ability to seamlessly connect embedded sensors across all sectors, i.e. mMTC. It is predicted that there will be 20.4 billion potential IoT devices by 2020. Industrial IoT is one area where 5G will play a key role in enabling smart cities, asset tracking, smart utilities, agriculture and security infrastructure.

[0039] URLLC includes new services transforming industries through ultra-reliable / available low-latency links such as remote control of key infrastructure and self-driving vehicles. The levels of reliability and latency are essential for smart grid control, industrial automation, robotics, and drone control and coordination.

[0040] Next, a number of use cases in 5G communication systems, including NR systems, will be described in more detail.

[0041] 5G is a means of delivering streams rated at hundreds of megabits per second to gigabits per second, and can complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS). Such high speeds are required to deliver TV at resolutions of 4K and above (6K, 8K and beyond), as well as virtual and augmented reality. Virtual reality (VR) and augmented reality (AR) applications include most immersive sports competitions. Certain applications may require special network configurations. For example, in the case of VR games, gaming companies must integrate their core servers with the network operator's edge network servers to minimize latency.

[0042] Automotive is expected to be an important new driver of 5G with many use cases for mobile communications to vehicles. For example, entertainment for passengers will require simultaneous high capacity and high mobility mobile broadband, because future users will expect a continuous high quality connection regardless of their location and speed. Another use case in the automotive field is the augmented reality dashboard, which displays information that identifies objects in the dark and tells the driver about the object's distance and movement over what the driver sees through the front window. In the future, wireless modules will enable communication between vehicles, information exchange between vehicles and supporting infrastructure, and between cars and other connected devices (e.g. devices accompanied by pedestrians). Safety systems will guide the driver through alternative courses of action to make driving safer and reduce the risk of accidents. The next step will be remotely piloted or self-driven vehicles, which will require very reliable and very fast communication between different self-driving vehicles and between cars and infrastructure. In the future, self-driving vehicles will perform all driving activities, allowing the driver to focus only on traffic anomalies that the vehicle itself cannot identify. The technical requirements of self-driving vehicles demand ultra-low latency and ultra-fast reliability so that traffic safety is increased to a level unattainable by humans.

[0043] Smart cities and smart homes, also referred to as smart society, are embedded with dense wireless sensor networks. A distributed network of intelligent sensors identifies requirements for cost and energy-efficient maintenance of the city or home. A similar setup can be made for each home. Temperature sensors, window and heating controllers, burglar alarms and home appliances are all wirelessly connected. Many of these sensors typically have low data transmission rates, low power and low cost. However, for example, real-time HD video may be required for certain types of devices for surveillance.

[0044] The consumption and distribution of energy, including heat or gas, is highly decentralized, requiring automated control of distributed sensor networks. A smart grid interconnects such sensors using digital information and communication technologies to collect and act upon information. This information can include supplier and consumer actions, allowing the smart grid to improve the efficiency, reliability, economy, sustainability of the production, and distribution of fuels, such as electricity, in an automated manner. A smart grid can also be viewed as another sensor network with low latency.

[0045] The health sector has many applications that can benefit from mobile communications. Communication systems can support telemedicine to provide clinical care over long distances. This helps reduce the barrier of distance and can improve access to medical services that are not sustainably available in remote rural areas. It can also be used to save lives in critical care and emergency situations. Mobile-based wireless sensor networks can provide remote monitoring and sensing for parameters such as heart rate and blood pressure.

[0046] Wireless and mobile communications are becoming more and more important in industrial applications. Wiring is expensive to install and maintain. The possibility to replace cables with reconfigurable wireless links is therefore an attractive opportunity in many industrial sectors. However, to achieve this it is required that the wireless connections operate with similar latency, reliability and capacity as cables, and to simplify their management. Low latency and very low error probability are new requirements that need to be addressed leading to 5G.

[0047] Logistics and freight tracking are important use cases for mobile communications that use location-based information systems to enable inventory and package tracking anywhere. Logistics and freight tracking use cases typically require low data rates, but require wide range and reliable location information.

[0048] FIG. 1 is a diagram illustrating physical channels and a general signal transmission method used in the 3GPP system.

[0049] A terminal that is turned on in a power-off state or that newly enters a cell performs an initial cell search, such as establishing synchronization with a base station (S11). To this end, the terminal receives a synchronization signal block (SSB) from the base station. The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS) and a physical broadcast channel (PBCH). The terminal establishes synchronization with the base station based on the PSS / SSS and obtains information such as a cell identity (cell ID). The terminal also receives a PBCH from the base station to obtain broadcast information within the cell. In addition, the terminal can receive a DL downlink reference signal (RS) during the initial cell search stage to check the state of the downlink channel.

[0050] After completing the initial cell search, the terminal receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) corresponding to the PDCCH to obtain more specific system information (S12).

[0051] Thereafter, the terminal performs a random access procedure to complete connection to the base station (S13 to S16). More specifically, the terminal transmits a preamble via a physical random access channel (PRACH) (S13), and receives a random access response (RAR) for the preamble via a PDCCH and a corresponding PDSCH (S14). Thereafter, the terminal transmits a physical uplink shared channel (PUSCH) using scheduling information in the RAR (S15), and performs a contention resolution procedure like the PDCCH and the corresponding PDSCH (S16).

[0052] If the optional access process consists of two stages, S13 / S15 are performed in one stage (where the terminal transmits) (message A) and S14 / S16 are performed in the other stage (where the base station transmits) (message B).

[0053] After performing this procedure, the terminal then receives PDCCH / PDSCH (S17) and transmits PUSCH / PUCCH (Physical Uplink Control Channel) as a general uplink / downlink signal transmission procedure (S18). Control information transmitted by the terminal to the base station is called UCI (Uplink Control Information). UCI includes HARQ ACK / NACK (Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK), SR (Scheduling Request), CSI (Channel State Information), etc. CSI includes CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indication), etc. UCI is generally transmitted via PUCCH, but is transmitted via PUSCH when control information and data need to be transmitted simultaneously. In addition, the terminal can transmit UCI aperiodically via PUSCH at the request / instruction of the network.

[0054] FIG. 2 is a diagram illustrating a structure of a radio frame.

[0055] In NR, uplink and downlink transmissions are composed of frames. A radio frame has a length of 10 ms and is defined by two 5 ms half-frames (Half-Frame, HF). A half-frame is defined by five 1 ms subframes (Subframe, 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, the symbols include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or DFT-s-OFDM symbols).

[0056] Table 1 illustrates that 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 a general CP is used.

[0057] [Table 1]

[0058] *N slot symb :Number of symbols in the slot

[0059] *N frame,u slot : Number of slots in the frame

[0060] *N subframe,u slot : Number of slots in a subframe

[0061] Table 2 illustrates that 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 the extended CP is used.

[0062] [Table 2]

[0063] The frame structure is merely an example, and the number of subframes, slots, and symbols in a frame can be changed in various ways. In an NR system, OFDM numerology (e.g., SCS, CP length, etc.) is set to be different between multiple cells merged into one terminal. As a result, the (absolute time) duration 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 can be set to be different between merged cells.

[0064] NR supports multiple neurologies (or 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 bandwidth. A 60 kHz or higher SCS supports bandwidths larger than 24.25 GHz to overcome phase noise.

[0065] The NR frequency band is defined by two types of frequency ranges (FR1 and FR2). FR1 and FR2 are configured as shown in Table 3 below. FR2 also stands for millimeter wave (mmW).

[0066] [Table 3]

[0067] FIG. 3 illustrates a resource grid of a slot. One slot includes multiple symbols in the time domain. For example, in the case of a general CP, one slot includes 14 symbols, while in the case of an extended CP, one slot includes 12 symbols. A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) is defined by multiple (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) is defined by multiple (P) consecutive RBs in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier includes up to N (e.g., 5) BWPs. Data communication is performed in the activated BWPs, and only one BWP is activated for one terminal. In the resource grid, each element is called a resource element (RE), and one modulation symbol can be mapped to it.

[0068] Each physical channel is described in more detail below.

[0069] Downlink Channel Structure

[0070] The base station transmits relevant signals to the terminal via a downlink channel, which will be described later, and the terminal receives relevant signals from the base station via a downlink channel, which will be described later.

[0071] (1) Physical Downlink Shared Channel (PDSCH)

[0072] The PDSCH carries downlink data (e.g., DL-SCH transport block, DL-SCH TB) and uses modulation methods such as QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, and 256QAM. The TB is encoded to generate a codeword. The PDSCH carries up to two codewords. Scrambling and modulation mapping are performed for each codeword, and the modulation symbols generated from each codeword are mapped to one or more layers. Each layer is mapped to resources together with the DMRS (Demodulation Reference Signal) to generate an OFDM symbol signal, which is then transmitted by the corresponding antenna port.

[0073] (2) Physical Downlink Control Channel (PDCCH)

[0074] 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 (downlink shared channel), resource allocation information for the UL-SCH (uplink shared channel), paging information for the PCH (paging channel), system information on the DL-SCH, resource allocation information for higher layer control messages such as an voluntary access response transmitted on the PDSCH, a transmission power control command, activation / deactivation of configured scheduling (CS), etc. The DCI includes a cyclic redundancy check (CRC), and the CRC is masked / scrambled with various identifiers (e.g., Radio Network Temporary Identifier, RNTI) depending on the owner or use of the PDCCH. For example, if the PDCCH is for a specific terminal, the CRC is masked with a terminal identifier (e.g., cell-RNTI, C-RNTI). If the PDCCH is for paging, the CRC is masked with a P-RNTI (Paging-RNTI). If the PDCCH is for system information (e.g., System Information Block, SIB), the CRC is masked with a System Information RNTI (SI-RNTI). If the PDCCH is for an unsolicited access response, the CRC is masked with a Random Access-RNTI (RA-RNTI).

[0075] The modulation method of the PDCCH is fixed (e.g., Quadrature Phase Shift Keying, QPSK), and one PDCCH is composed of 1, 2, 4, 8, or 16 CCEs (Control Channel Elements) depending on the AL (Aggregation Level). One CCE is composed of six REGs (Resource Element Groups). One REG is defined by one OFDM symbol and one (P)RB.

[0076] PDCCH is transmitted in a CORESET (Control Resource Set). CORESET corresponds to a physical resource / parameter set used to carry PDCCH / DCI in BWP. For example, CORESET includes a REG set having a predetermined neurology (e.g., SCS, CP length, etc.). CORESET is configured by system information (e.g., MIB) or UE-specific higher layer (e.g., RRC) signaling. Examples of parameters / information used to configure CORESET are as follows: One or more CORESETs are configured for one UE, and multiple CORESETs are superimposed in the time / frequency domain.

[0077] - controlResourceSetId: Indicates the identification information (ID) of the CORESET.

[0078] - frequencyDomainResources: Indicates the frequency domain resources of the CORESET. It is indicated by a bitmap, and each bit corresponds to an RB group (= 6 consecutive RBs). For example, the most significant bit (MSB) of the bitmap corresponds to the first RB group in the BWP. The RB group corresponding to the bit whose bit value is 1 is assigned to the frequency domain resources of the CORESET.

[0079] - duration: indicates the time domain resource of CORESET. It indicates the number of consecutive OFDMA symbols that constitute CORESET. For example, duration has a value of 1 to 3.

[0080] - cce-REG-MappingType: indicates the CCE-to-REG mapping type. Interleaved and non-interleaved types are supported.

[0081] - precoderGranularity: indicates the precoder granularity in the frequency domain.

[0082] - tci-StateSPDCCH: Indicates information (e.g., TCI-StateID) indicating the TCI (Transmission Configuration Indication) state for the PDCCH. The TCI state is used to provide a Quasi-Co-Location (QCL) relationship between DL RSs and PDCCH DMRS ports in an RS set (TCI-State).

[0083] - tci-PresentInDCI: indicates whether the TCI field in the DCI is included or not.

[0084] - pdcch-DMRS-ScramblingID: indicates information used for initialization of the PDCCH DMRS scrambling sequence.

[0085] For PDCCH reception, the UE monitors a set of PDCCH candidates in the CORESET (e.g., blind decoding). The PDCCH candidates indicate the CCEs that the UE monitors for PDCCH reception / detection. PDCCH monitoring is performed in one or more CORESETs on an active DL BWP on each activated cell where PDCCH monitoring is configured. The set of PDCCH candidates that the UE monitors is defined by a PDCCH Search Space (SS) set. The SS set is a Common Search Space (CSS) set or a UE-specific Search Space (USS) set.

[0086] Table 4 illustrates the PDCCH search space.

[0087] [Table 4]

[0088] An SS set is configured by system information (e.g., MIB) or UE-specific higher layer (e.g., RRC) signaling. S (e.g., 10) or less SS sets are configured in each DL BWP of a serving cell. For example, the following parameters / information are provided for each SS set. Each SS set is associated with one CORESET, and each CORESET configuration is associated with one or more SS sets. -searchSpaceId: indicates the ID of the SS set.

[0089] - controlResourceSetId: Indicates the CORESET associated with the SS set.

[0090] - monitoringSlotPeriodicityAndOffset: indicates the PDCCH monitoring periodicity period (in slot units) and the PDCCH monitoring period offset (in slot units).

[0091] - monitoringSymbolsWithinSlot: indicates the first OFDMA symbol for PDCCH monitoring in a slot where PDCCH monitoring is configured. It is indicated by a bitmap, and each bit corresponds to each OFDMA symbol in the slot. The MSB of the bitmap corresponds to the first OFDMA symbol in the slot. The OFDMA symbol corresponding to a bit whose bit value is 1 corresponds to the first symbol of CORESET in the slot.

[0092] - nrofCandidates: indicates the number of PDCCH candidates for AL={1, 2, 4, 8, 16} (e.g., one of 0, 1, 2, 3, 4, 5, 6, 8).

[0093] - searchSpaceType: indicates whether the SS type is CSS or USS.

[0094] - DCI format: Indicates the DCI format of the PDCCH candidate.

[0095] Based on the CORESET / SS set configuration, the terminal can monitor PDCCH candidates in one or more SS sets in a slot. An opportunity (e.g., a time / frequency resource) for monitoring a PDCCH candidate is defined as a PDCCH (monitoring) opportunity. One or more PDCCH (monitoring) opportunities are configured in a slot.

[0096] Table 5 illustrates an example of a DCI format transmitted via the PDCCH.

[0097] [Table 5]

[0098] DCI format 0_0 is used to schedule a TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​is used to schedule a TB-based (or TB-level) PUSCH or a Code Block Group (CBG)-based (or CBG-level) PUSCH. DCI format 1_0 is used to schedule a TB-based (or TB-level) PDSCH, and DCI format 1_1 is used to schedule a TB-based (or TB-level) PDSCH or a CBG-based (or CBG-level) PDSCH. DCI format 0_0 / 0_1 is called UL grant DCI or UL scheduling information, and DCI format 1_0 / 1_1 is called DL grant DCI or UL scheduling information. DCI format 2_0 is used to deliver dynamic slot format information (e.g., dynamic SFI) to a terminal, and DCI format 2_1 is used to deliver downlink pre-Emption information to a terminal. DCI format 2_0 and / or DCI format 2_1 are transmitted to terminals in a corresponding group via a group common PDCCH, which is a PDCCH transmitted to terminals defined in one group. DCI format 0_0 and DCI format 1_0 are referred to as fallback DCI formats, and DCI format 0_1 ​​and DCI format 1_1 are referred to as non-fallback DCI formats. The fallback DCI format maintains the same DCI size / field configuration regardless of the terminal settings. On the other hand, the non-fallback DCI format has a different DCI size / field configuration depending on the terminal settings.

[0099] Uplink Channel Structure

[0100] The terminal transmits relevant signals to the base station via an uplink channel, which will be described later, and the base station receives relevant signals from the terminal via an uplink channel, which will be described later.

[0101] (1) Physical Uplink Control Channel (PUCCH)

[0102] The PUCCH carries Uplink Control Information (UCI), HARQ-ACK, and / or a Scheduling Request (SR), and is classified into a Short PUCCH and a Long PUCCH according to the PUCCH transmission length.

[0103] The UCI includes:

[0104] - SR (Scheduling Request): Information used to request UL-SCH resources.

[0105] - HARQ-ACK: a response to a downlink data packet (e.g., a codeword) on the PDSCH. It indicates whether the downlink data packet is successfully received. A 1-bit HARQ-ACK is sent as a response to a single codeword, and a 2-bit HARQ-ACK is sent as a response to two codewords. HARQ-ACK responses include positive ACK (simply, ACK), negative ACK (hereinafter, NACK), DTX, or NACK / DTX. Here, HARQ-ACK is used interchangeably with HARQ ACK / NACK and ACK / NACK.

[0106] - Channel State Information (CSI): Feedback information related to a downlink channel. Multiple Input Multiple Output (MIMO)-related feedback information includes a Rank Indicator (RI) and a Precoding Matrix Indicator (PMI).

[0107] Table 6 shows an example of a PUCCH format. It can be divided into Short PUCCH (formats 0 and 2) and Long PUCCH (formats 1, 3 and 4) according to the PUCCH transmission length.

[0108] [Table 6]

[0109] PUCCH format 0 carries UCI with a maximum size of 2 bits, and is mapped and transmitted based on a sequence. Specifically, the terminal transmits one of a plurality of sequences through a PUCCH with PUCCH format 0 to transmit a specific UCI to the base station. The terminal transmits PUCCH with PUCCH format 0 within a PUCCH resource for a corresponding SR setting only when transmitting a positive SR. PUCCH format 1 carries UCI with a maximum size of 2 bits, and modulation symbols are spread by an orthogonal cover code (OCC) in the time domain (set differently depending on whether frequency hopping is performed). DMRS is transmitted by a symbol without a modulation symbol (i.e., transmitted by TDM (Time Division Multiplexing)).

[0110] PUCCH format 2 carries UCI with a bit size larger than 2 bits, and modulation symbols are transmitted after frequency division multiplexing (FDM) with DMRS. DM-RS is located at symbol indexes #1, #4, #7, and #10 in a 1 / 3 density resource block. A Pseudo Noise (PN) sequence is used for the DM_RS sequence. Frequency hopping can be activated for the 2-symbol PUCCH format 2.

[0111] In PUCCH format 3, terminal multiplexing is not performed within the same physical resource block, and UCI with a bit size larger than 2 bits is carried. That is, the PUCCH resource of PUCCH format 3 does not include an orthogonal cover code. The modulation symbols are transmitted after being subjected to TDM (Time Division Multiplexing) with DMRS.

[0112] PUCCH format 4 supports multiplexing of up to four terminals in the same physical resource block and carries UCI with a bit size larger than 2 bits. That is, the PUCCH resource of PUCCH format 3 includes an orthogonal cover code. Modulation symbols are transmitted after being time division multiplexed (TDM) with DMRS.

[0113] (2) Physical Uplink Shared Channel (PUSCH)

[0114] The PUSCH carries uplink data (e.g., UL-SCH transport block, 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 the DFT-s-OFDM waveform, the terminal applies transform precoding to transmit the PUSCH. As an 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. PUSCH transmissions are dynamically scheduled by UL grants in the DCI or semi-statically scheduled (configured scheduling, configured grant) based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)). PUSCH transmissions are codebook-based or non-codebook-based.

[0115] In the downlink, the base station dynamically allocates resources for downlink transmission to the terminal through the PDCCH(s) (including DCI format 1_0 or DCI format 1_1). The base station also conveys through the PDCCH(s) (including DCI format 2_1) that some of the resources previously scheduled for a specific terminal have been pre-empted for signal transmission to other terminals. The base station also sets a period of downlink assignment through higher layer signaling based on a semi-persistent scheduling (SPS) method, and provides the terminal with downlink assignment for initial HARQ transmission by signaling activation / deactivation of the set downlink assignment through the PDCCH. At this time, if retransmission for the initial HARQ transmission is necessary, the base station explicitly schedules retransmission resources through the PDCCH. If a collision occurs between the downlink assignment based on the DCI and the downlink assignment based on the forward-persistent scheduling, the terminal prioritizes the downlink assignment based on the DCI.

[0116] Similar to the downlink, in the uplink, the base station dynamically allocates resources for uplink transmission to the terminal via PDCCH(s) (including DCI format 0_0 or DCI format 0_1). The base station also allocates uplink resources for initial HARQ transmission to the terminal based on a configured grant method (such as SPS). In dynamic scheduling, PUSCH transmission is accompanied by PDCCH, but in configured grant, PUSCH transmission is not accompanied by PDCCH. However, uplink resources for retransmission are explicitly allocated via PDCCH(s). In this way, an operation in which uplink resources are pre-configured by the base station without a dynamic grant (e.g., uplink grant by scheduling DCI) is called a 'configured grant'. Configured grants are defined by the following two types:

[0117] - Type 1: A regular periodic uplink grant is provided by higher layer signaling (configured without separate layer 1 signaling).

[0118] -Type 2: The period of the uplink grant is set by higher layer signaling, and the uplink grant is provided by signaling the activation / deactivation of the set grant via the PDCCH.

[0119] Dynamic slot format indication (e.g. DCI format 2_0)

[0120] Basically, the slot format indicates the use of each symbol in the slot, and indicates one of the following for each symbol: downlink (D), uplink (U), or floating (F). Information about the slot format is transmitted in one or more of the following signals:

[0121] - Static or semi-static Slot Format Indication (SFI) via higher layer signaling (e.g., TDD-UL-DL-ConfigurationCommon and / or TDD-UL-DL-ConfigDedicated, etc.)

[0122] - Measurement-related scheduling signals (e.g., measurement-related signals configured by terminal-specific RRC signaling)

[0123] - Dynamic SFI (e.g. signals transmitted in DCI format 2_0)

[0124] - terminal-specific data transmission scheduling signals (e.g., terminal-specific DCI)

[0125] Static or semi-static SFI is indicated by cell-specific RRC signaling (e.g., TDD-UL-DL-ConfigurationCommon) or terminal-specific RRC signaling (e.g., TDD-UL-DL-ConfigDedicated). Measurement-related signals are indicated by terminal-specific RRC signaling, which indicate periodic / semi-persistent CSI-RS, periodic CSI reporting, periodic / semi-persistent SRS, etc. for CSI reporting. Terminal-specific data transmission-related signals include DCI triggering aperiodic measurement-related signals such as PDSCH, PUSCH, terminal-specific DCI triggering PUCCH together with A / N for PDSCH, aperiodic CSI-RS, aperiodic SRS, etc.

[0126] The slot format includes formats for 0, 1, or 2 switching points. Figure E1 illustrates various slot formats. Specifically, Figure 14(a) illustrates a slot format for 0 switching point, Figure 14(b) illustrates a slot format for one switching point, and Figure 14(c) illustrates a slot format for two switching points.

[0127] The slot format for 0 switching points consists of 14 DL symbols, 14 flexible symbols, or 14 UL symbols. The slot format for 1 switching point is configured to start with 0 or more DL symbols and end with 0 or more UL symbols, with one or more flexible symbols and DL / UL symbols in between. The slot format for 2 switching points consists of a first 7 symbols starting with 0 or more DL symbols and 1 or more UL symbols ending with the 7th symbol, and a second 7 symbols starting with 1 or more DL symbols and ending with 0 or more UL symbols. Each of the first 7 symbols and the second 7 symbols includes 0 or more flexible symbols.

[0128] Up to 256 such slot formats are defined, and their configurations are defined by standard documents such as TS 38.211. The terminal sets a terminal-specific SFI table based on the up to 256 slot formats by higher layer signaling, and receives a specific index value of the terminal-specific SFI table by DCI format 2_0 (or a group-common PDCCH).

[0129] The terminal determines the slot format based on the following priority order for the signal transmitting the information on the above-mentioned slot format: More specifically, when the terminal receives the information on the slot format through a plurality of signals, the terminal considers the indication information of the signal with the lower priority order only for the purpose of confirming the use of the symbol indicated as a flexible symbol by the signal with the higher priority order.

[0130] "Slot format information by cell-specific higher layer signaling (e.g., TDD-UL-DL-ConfigurationCommon) > Slot format information by terminal-specific higher layer signaling (e.g., TDD-UL-DL-ConfigDedicated) > Slot format information by group-common PDCCH (e.g., DCI format 2_0) > Terminal-specific data transmission scheduling information > Measurement-related scheduling information"

[0131] Therefore, when a specific symbol in a slot is instructed as downlink / uplink by cell-specific RRC signaling or terminal-specific RRC signaling to a terminal, the terminal does not expect DCI format 2_0 (or a group-specific PDCCH including DCI format 2_0) to instruct uplink / downlink or flexible for the specific symbol. When a specific symbol in a slot is instructed as a flexible symbol by DCI format 2_0 (or a group-specific PDCCH including DCI format 2_0), the terminal transmits / receives a signal related to the specific symbol only after receiving another scheduling information (e.g., terminal-specific scheduling DCI), and does not transmit / receive a signal using the specific symbol unless another scheduling information is received.

[0132] In addition, DCI format 2_0 (or a group-specific PDCCH including DCI format 2_0) further includes information on an available RB set, a channel occupancy time (COT) interval, and search space set group switching. Specifically, DCI format 2_0 includes one or more of the following information: The CRC of DCI format 2_0 is scrambled with a terminal group common identifier (e.g., SFI-RNTI). The size of DCI format 2_0 is configurable up to 128 bits by a higher layer (e.g., RRC).

[0133] - slot format indicator 1, slot format indicator 2, …, slot format indicator N.

[0134] - If the available higher layer parameter RB-SetPerCell is configured,

[0135] available RB set indicator 1, available RB set indicator 2, ..., available RB set indicator N1,

[0136] - If the higher-level parameter CO-DurationPerCell is configured,

[0137] - COT interval indicator 1, COT interval indicator 2, …, COT interval indicator N2.

[0138] - If the upper hierarchy parameter searchSpaceSwitchTrigger is configured,

[0139] - Monitoring group flag 1, Monitoring group flag 2, …, Monitoring group flag M.

[0140] Here, the RB set corresponds to a frequency resource in which a channel access procedure (CAP) is individually performed in a shared spectrum, and is composed of multiple consecutive (P)RBs. The available RB set indicator indicates an RB set index available for DL ​​reception in a cell. The COT duration indicator indicates a channel occupancy time shared between a base station and a terminal in a shared spectrum. The monitoring group flag indicates a search space group that a terminal should monitor among multiple search space groups (e.g., group #0 / #1) set for the same cell. DCI format 2_0 is group common control information, and the position (e.g., starting point) of information for each terminal is indicated by a higher layer (e.g., RRC) signal. For example, availableRB-SetPerCell is a terminal-specific signal, and may include information regarding the position (e.g., starting point) of an available RB set indicator for the terminal in DCI format 2_0. Similarly, CO-DurationPerCell and searchSpaceSwitchTrigger are also terminal-specific signals and may each contain information regarding the location (e.g., starting point) of the information for that terminal within DCI format 2_0.

[0141] Energy saving in base stations is an important consideration in wireless communication systems, including 3GPP, because it can help build environmentally friendly networks by reducing carbon emissions and contribute to reducing the operational expenditure (OPEX) of communication operators. In particular, the introduction of 5G communication requires high transmission rates, so base stations need to be equipped with more antennas and provide services with wider bandwidth and frequency bands. As a result, recent studies have shown that the energy costs of base stations have reached up to 20% of the total OPEX. Due to the increased interest in energy saving in base stations, a new study item called "study on network energy savings" was approved in 3GPP NR release 18.

[0142] Specifically, in this item, the following enhancement techniques are considered to improve the energy saving capability from the perspective of transmission and reception of a base station:

[0143] How to more efficiently apply one or more NES techniques in time, frequency, space and power domains based on UE assistance information and potential support / feedback from the UE for dynamic and / or semi-static operation and finer granularity adaptation operation in transmission and reception;

[0144] In this disclosure, a time-axis base station energy saving method is proposed.

[0145] In the present disclosure, a scenario is mainly considered in which a base station dynamically sets / indicates a specific ON time interval during which DL (Downlink) or UL (Uplink) signals / channels can be transmitted and an OFF time interval during which DL or UL signal channels cannot be transmitted, thereby increasing network energy saving (NES) gain. For example, a base station pre-sets multiple OFF intervals during which a specific DL signal is turned off during a specific time interval (e.g., one or more slots / symbols / subframe intervals), dynamically indicates one of the multiple OFF intervals, and notifies a terminal that the DL signal is not transmitted during the time interval corresponding to the one pre-defined OFF interval, thereby reducing the power consumption of the base station and the terminal, and also mitigating interference.

[0146] For example, in the present disclosure, a base station operating in an NES mode for ES (Energy Saving) means that the base station pre-sets a plurality of OFF intervals for turning off transmission of a specific DL signal during a specific time interval, dynamically indicates one of the OFF intervals, and operates to obtain power consumption savings of the base station and the terminal in which the DL signal is not transmitted during a time interval corresponding to the one pre-defined OFF interval. Meanwhile, for example, the OFF interval means a DTX (Discontinuous Transmission) interval of the base station.

[0147] Alternatively, for example, a base station operating in the NES mode means performing operations such as BWP (Bandwidth Part) switching and dynamic RB (Resource Block) adaptation not only in the time domain but also in the frequency domain. Also, a base station operating in the NES mode means an operation mode in which, for example, when a specific transmitting / receiving antenna port of the base station is semi-statically or dynamically turned off in the spatial domain, the base station does not transmit and / or receive through the antenna port, thereby reducing power consumption of the base station and the terminal.

[0148] 6 to 8 are diagrams for explaining the overall operation process of a terminal and a base station according to an embodiment of the present disclosure.

[0149] FIG. 6 is a diagram for explaining the overall operation process of a terminal according to the present disclosure.

[0150] Referring to Fig. 6, the terminal receives information regarding the NES operation of the base station (S601). For example, the information regarding the NES operation is information regarding ON / OFF for one or more time periods, or information regarding whether the base station is operating in the NES mode. Alternatively, the information is information regarding the period of DL / UL signals / channels according to the NES mode. For example, the terminal receives the information regarding the NES operation based on at least one of [Method #1] to [Method #7].

[0151] The terminal transmits and receives DL / UL channels in one or more time intervals based on the information on the NES operation (S603). For example, the terminal transmits and receives DL / UL channels based on at least one of [Method #1] to [Method #7].

[0152] FIG. 7 is a diagram for explaining the overall operation process of a base station according to an embodiment of the present disclosure.

[0153] Referring to Fig. 7, a base station transmits information regarding the NES operation of the base station (S701). For example, the information regarding the NES operation is information regarding ON / OFF for one or more time periods, or information regarding whether the base station is operating in the NES mode. Alternatively, the information is information regarding the period of DL / UL signals / channels according to the NES mode. For example, the base station transmits the information regarding the NES operation based on at least one of [Method #1] to [Method #7].

[0154] The base station transmits and receives DL / UL channels in one or more time intervals based on information about the NES operation (S603). For example, the base station transmits and receives DL / UL channels based on at least one of [Method #1] to [Method #7].

[0155] FIG. 8 is a diagram for explaining the overall operation process of a network according to an embodiment of the present disclosure.

[0156] Referring to FIG. 8, a base station transmits information regarding the NES operation of the base station to a terminal (S801). For example, the information regarding the NES operation is information regarding ON / OFF for one or more time periods, or information regarding whether the base station is operating in the NES mode. Alternatively, the information is information regarding the period of DL / UL signals / channels according to the NES mode. For example, the base station transmits information regarding the NES operation to a terminal based on at least one of [Method #1] to [Method #7].

[0157] The base station and the terminal transmit and receive DL / UL channels in one or more time intervals based on information about the NES operation (S803). For example, the base station and the terminal transmit and receive DL / UL channels based on at least one of [Method #1] to [Method #7].

[0158] On the other hand, in [Method #1] to [Method #7] described below, a specific time interval means one or more slots / symbols / subframes.

[0159] [Method #1] A method in which the base station instructs to turn off DL / UL signals / channels during a specific time period using (group-common) DCI (Downlink Control Information) or MAC-CE (Medium Access Control-Control Element)

[0160] 1. Method #1-1

[0161] The base station sets a plurality of OFF durations in advance, and indicates one of the plurality of OFF durations by DCI or MAC-CE.

[0162] In this case, infinite or an inapplicable value is set to multiple pre-defined OFF period candidates, and if infinite / non-numerical / inapplicable value is indicated by (GC-)DCI or MAC CE, the OFF state is maintained until another ON is indicated.

[0163] 2. Method #1-2

[0164] A timer value is preset, and when OFF is specified, transmission and reception of DL / UL signals / channels is turned OFF during the timer period, and when the timer expires, transmission and reception of DL / UL signals / channels is turned ON again.

[0165] 3. Method #1-3

[0166] One more state (e.g., N) is added to the states D / U / F indicated by the conventional SFI (slot format indicator). In the symbol section in which the state (e.g., N) is indicated by the SFI, the operation of the OFF section proposed in this method (e.g., operation based on any one of methods #1 to #7) is applied.

[0167] 4. Method #1-4

[0168] Even in a section where transmission and reception of DL / UL signals / channels is turned off by the instruction method proposed in the present disclosure, transmission and reception of specific DL / UL signals / channels is exceptionally permitted. For example, the specific DL / UL signals / channels are SSB (Synchronization Signal Block) and / or CSI-RS (Channel State Information-Reference Signal) for tracking and / or PRACH (Physical Random Access Channel).

[0169] 5. Method #1-5

[0170] For PDCCH monitoring, if PDCCH monitoring continues even during a period in which transmission / reception of DL / UL signals / channels is turned OFF by an instruction method proposed in the present disclosure (e.g., an instruction method based on any one of methods #1 to #7), a search space set group (SSSG) associated with the ON period and an SSSG associated with the OFF period are set separately, or the periodicity of the SS set during the OFF period is set longer than the periodicity of the SS set during the ON period.

[0171] However, in the above, the preset OFF period and / or timer candidate value are common to all DL / UL signals / channels, or the OFF period and / or timer candidate value are set for each DL / UL signal / channel.

[0172] In addition, when an OFF period and / or timer value of a particular DL / UL signal / channel is indicated, the DL / UL signal / channel to be turned off may be set or defined in advance, or the DL / UL signal / channel to be turned off may be directly indicated by the base station.

[0173] In addition, the relationship between DL / UL signals / channels is preset, and when a specific signal / channel is instructed to be turned off, the associated signal / channel is also turned off. The signals / channels to be turned off include the PDCCH, and when the PDCCH is turned off, the terminal does not perform PDCCH monitoring during the OFF period and / or the timer period. If the PDCCH is not included in the OFF signal / channel, the terminal performs PDCCH monitoring during the OFF period and / or the timer period and receives an instruction to extend the OFF period via the PDCCH or receives an instruction to switch to the ON period via the PDCCH.

[0174] On the other hand, when the OFF duration and / or OFF by the timer is indicated by the (group-common) DCI or MAC-CE, the application start point and length of the OFF duration and / or timer are set by a predetermined parameter when the OFF duration and / or timer candidate value are set, or are set by joint encoding with the OFF duration and / or timer candidate value, respectively. Alternatively, the application start point and length of the OFF duration and / or timer are determined to a pre-agreed value (e.g., a pre-defined value in a standard) or are set differently for each terminal in consideration of the processing time of the terminal. Alternatively, the application start point and length of the OFF duration and / or timer are dynamically indicated together with the OFF indication by the (group-common) DCI or MAC-CE indication.

[0175] In addition, when an OFF interval and / or timer is indicated by the (group-common) DCI or MAC-CE, inactivity-related timers (e.g., BWPinactiveTimer, SCellinactiveTimer, dataInactivityTimer, DRX (Discontinuous Reception)-related timers) configured in the terminal are held during the OFF interval and resumed when the OFF interval ends, or stopped during the OFF interval and restarted when the OFF interval ends.

[0176] There have been methods to achieve power saving by semi-statically turning off transmission / reception in specific subframes / slots. However, the above-mentioned methods may cause a large delay in data transmission and may seriously degrade the performance of terminals because it is difficult to immediately change the transmission rate.

[0177] In particular, the above-mentioned method is inefficient and difficult to use in delay sensitive services such as Ultra Reliable Low Latency Communication (URLLC). Therefore, a method is required to dynamically set / instruct the ON / OFF period of DL / UL signals / channels in units of symbols with smaller granularity than subframe / slot, thereby minimizing the decrease in the data transmission / reception rate of the terminal and reducing the power consumption of the base station and the terminal.

[0178] To this end, multiple ON / OFF intervals that can be set on a symbol-by-symbol basis for each UL / DL signal / channel are pre-set by a higher layer signal such as RRC (Radio Resource Control), and OFF for a specific time interval for a specific DL / UL signal can be instructed by (group-common) DCI or MAC-CE.

[0179] For example, the ON / OFF duration is set as {ON duration, duration 1, duration 2, ..., infinite value}. For example, the candidate values ​​of the ON / OFF duration for the PDSCH channel are set as {ON, 2 symbols, 4 symbols, ..., infinite}, and one of the candidate values ​​of the ON / OFF duration is indicated. If the indication is set to be applied after 4 symbols and 14 symbols are indicated by the MAC-CE, the PDSCH is turned off for 14 symbols after 4 symbols from the time the terminal receives the indication, so that the base station does not transmit the PDSCH and the terminal does not receive the PDSCH, thereby reducing power consumption.

[0180] In addition, if infinite or an inapplicable value is set as a candidate value for a pre-configured OFF period, and infinite / non-numerical / inapplicable value is indicated by the (GC-)DCI or MAC CE, the terminal maintains its DL / UL signal / channel in the OFF state until another ON indication is received from the base station.

[0181] Alternatively, multiple candidate timer values ​​and DL / UL signals / channels to which the timers are applied are set in advance. In this case, the DL / UL signals / channels to which the timers are applied may be set in common to the multiple candidate timer values, or may be set separately for each of the multiple candidate timer values.

[0182] When one of multiple candidate timer values ​​is indicated by the (group-common) DCI or MAC-CE, a specific DL / UL signal / channel is deactivated during the timer value and is not transmitted or received, thereby enabling the base station and the terminal to save energy. Meanwhile, when the timer expires, the specific DL / UL signal channel is activated again for transmission or reception. For example, if a timer value of 3 ms is set for the periodic CSI-RS and the periodic CSI-RS is set to be turned on a predetermined time (e.g., one slot) after the timer value expires, the periodic CSI-RS set during the time period during which the timer is operating is deactivated, and then when the timer expires, the periodic CSI-RS is turned on again for transmission or reception a predetermined time (e.g., one slot) after the expiration. In this case, for example, even if the periodic CSI-RS after being turned ON is not actually transmitted or received during the OFF period, the time at which the periodic CSI-RS was originally transmitted during the OFF period is taken into consideration, and the periodic CSI-RS after the ON period is transmitted or received.

[0183] For example, the periodic CSI-RS during the OFF period is considered to be dropped or deactivated, or the periodic CSI-RS transmission is assumed to have been released during the OFF period, and CSI-RS transmission / reception is performed such that a new periodic CSI-RS transmission / reception occurs when the ON period begins.

[0184] Meanwhile, in the above example, the timer also starts to operate a predetermined time (for example, one slot) after the DCI or MAC-CE is received, and enters an OFF period.

[0185] The OFF period and / or timer candidate value preset in the above may be common to all DL / UL signals and channels, or may be set for each DL / UL signal and channel. In other words, a specific OFF period and / or timer candidate value may be set for a single DL / UL signal / channel, or multiple DL or UL signals / channels may be linked to and used with the same OFF period and / or timer candidate value.

[0186] When an OFF period and / or timer value of a specific DL / UL signal / channel is indicated, the DL / UL signal / channel to be turned off may be preset / promised or defined in a standard, or the DL / UL signal / channel to be turned off may be directly indicated by a (group-common) DCI or MAC-CE. In addition, a relationship between DL / UL signals / channels is preset, and when a specific signal / channel is indicated as being turned off, the associated signal / channel is also turned off. For example, when a periodic CSI-RS and a periodic SRS are preset as an associated relationship, when an OFF period and / or timer value is indicated for a P-CSI-RS by a (group-common) DCI or MAC-CE, not only the P-CSI-RS but also the associated P-SRS are turned off during a time period corresponding to the OFF period and / or timer.

[0187] Meanwhile, the signal / channel to be turned off may include a PDCCH, and when the PDCCH is turned off, the terminal does not perform PDCCH monitoring during the OFF duration and / or timer. If the PDCCH is not included in the OFF signal / channel, the terminal performs PDCCH monitoring during the OFF duration and / or timer and receives an instruction to extend the OFF duration by a (group-common) DCI or MAC-CE, or receives an instruction to switch to an ON duration by a (group-common) DCI or MAC-CE. If an instruction is received by a (group-common) DCI or MAC-CE, the application start point and length of the OFF duration and / or timer are set according to a predetermined parameter when the OFF duration and / or timer candidate value are set, or are set by being jointly encoded with the OFF duration and / or timer candidate value, respectively. Alternatively, the application start point and length of the OFF period and / or timer may be determined to a pre-agreed value (e.g., a predetermined value defined in a standard) or may be set differently for each terminal in consideration of the processing time of the terminal. Alternatively, the application start point and length of the OFF period and / or timer may be dynamically indicated together with an OFF indication by a (group-common) DCI or MAC-CE indication.

[0188] In NR, symbols in a slot are semi-statically configured as U (uplink) / D (downlink) / F (flexible) by cell-specific signaling or UE-specific signaling.

[0189] In addition, for a terminal configured with DCI format 2_0 monitoring, the symbol configured as flexible is one of D / U / F and is dynamically indicated by DCI format 2_0. For a terminal for which SFI monitoring is not configured for a symbol configured as F, DL / UL configured by RRC can be transmitted and received.

[0190] In addition, in the case of a terminal configured to monitor SFI, 1) if the terminal fails to receive SFI, it only performs PDCCH monitoring with the symbol set to F, and 2) if it receives SFI and the symbol set to F by RRC is again instructed to F by SFI, DL / UL configured by RRC, including PDCCH monitoring, is not transmitted or received.

[0191] Based on the above, one more state (e.g., N) can be added to the states D / U / F indicated by the conventional SFI. In the symbol section in which the state (e.g., N) is indicated by the SFI, the operation of the OFF section proposed in this method (e.g., the operation based on any one of methods #1 to #7) is applied.

[0192] Meanwhile, even in a period in which transmission / reception of DL / UL signals / channels is turned off by the indication method proposed in the present disclosure, transmission / reception of specific DL / UL signals / channels may be exceptionally permitted. For example, signals / channels such as SSB and / or CSI-RS for tracking and / or PRACH are essential, so it is preferable to allow transmission / reception even in the OFF period.

[0193] In addition, for PDCCH monitoring, if PDCCH monitoring continues even in a period in which transmission / reception of DL / UL signals / channels is turned OFF by an instruction method proposed in the present disclosure (e.g., an instruction method based on any one of methods #1 to #7), an SSSG (search space set group) linked to the ON period and an SSSG linked to the OFF period are set separately.

[0194] For example, in the ON period, SS set configuration #1 with a relatively short PDCCH monitoring cycle is used, and in the OFF period, SS set configuration #2 with a relatively long PDCCH monitoring cycle is switched to and used.

[0195] As another example, SSSG index #0 is used in the ON period, and SSSG index #1 is switched to and used in the OFF period. At this time, SSSG index #0 has a relatively short PDCCH monitoring period, and SSSG index #1 has a relatively long PDCCH monitoring period. Alternatively, the periodicity of the SS set during the OFF period is set longer than the period of the SS set during the ON period.

[0196] According to [Method #1], OFF is dynamically instructed for at least one time period among a plurality of time periods, and ON / OFF of DL / UL signals / channels is set according to a semi-static ON / OFF pattern, thereby shortening the scheduling latency, and ON / OFF of DL / UL signals / channels is quickly instructed according to the cell situation, and transmission / reception of DL / UL signals / channels is not performed during the OFF time period, thereby minimizing degradation of DL / UL performance and efficiently reducing power consumption of the terminal and base station.

[0197] [Method #2] Dynamically adjusting the periodicity of DL / UL signals / channels in advance

[0198] 1. Method #2-1

[0199] (Periodic) A method in which multiple periodicity candidates of CSI-RS / SRS are set in advance, and one of the multiple periodicity candidates is indicated by (group-common) DCI or MAC CE

[0200] 2. Method #2-2

[0201] (Periodic) CSI-RS / SRS are pre-grouped into multiple groups according to a period, and (Group-Common) A method of adjusting the period by indicating a specific group among the multiple groups by DCI or MAC CE

[0202] The method is applicable not only to (periodic) CSI-RS / SRS but also to all DL / UL signals / channels (e.g., semi-persistent PDSCH, CG-PUSCH) that are preset and transmitted, and multiple periodicity candidate values ​​may be common to all DL / UL signals / channels, and multiple periodicity candidate values ​​may be set for each DL / UL signal / channel. Furthermore, when a change in the periodicity of a specific DL / UL signal / channel is instructed, the DL / UL signal / channel whose period is changed may be preset or defined, or the DL / UL signal / channel whose period is changed may be directly instructed.

[0203] In addition, a relationship between DL / UL signals and channels is preset, and when a change in the period of a specific signal / channel is instructed, the period of the related signal / channel is also changed. In this case, infinite or an inapplicable value is set as a preset period candidate value, and when infinite / non-numerical / inapplicable value is instructed by (GC-)DCI or MAC CE, the previous period is maintained until another instruction is given.

[0204] In addition, when a period is indicated by the (group-common) DCI or MAC-CE, inactivity-related timers (e.g., BWPinactiveTimer, SCellinactiveTimer, dataInactivityTimer, DRX (Discontinuous Reception)-related timers) configured in the terminal are either held during the interval in which CSI-RS / SRS is not transmitted and resumed when the interval ends, or stopped during the interval and restarted when the interval ends, depending on the changed period.

[0205] For example, in the case of (periodic) CSI-RS / SRS, resources for periodic transmission and reception are preset by a higher layer signal such as RRC, and even if the base station does not transmit another DCI (DL assignment or UL grant), the terminal receives CSI-RS and transmits SRS in the preset resource. However, since such periodic DL / UL signals / channels are semi-statically assigned with period and resources, it is difficult to dynamically change the period, and RRC reconfiguration is required to change the period. Therefore, since it takes a relatively long time to change the period, it is not easy to dynamically turn on / off a signal with a specific period according to the traffic situation of the base station, and it is not efficient in terms of power saving.

[0206] For example, if there is little data for a base station to transmit to a terminal temporarily during a certain time period, the base station can switch to a sleep mode to save power. However, if a periodic P-CSI-RS or P-SRS resource is configured during that time period, the base station needs to transmit and receive P-CSI-RS or P-SRS, which consumes power for the transition time and transition, and the base station may not be able to enter the sleep mode at all or may only sleep for a very short period of time, which may result in little power saving effect. However, since such low traffic situations occur dynamically, it is difficult to predict the traffic situation in advance, and it is not preferable to perform RRC reconfiguration every time a low traffic situation or traffic fluctuation occurs.

[0207] Therefore, when a base station pre-configures periodic DL / UL signals and channels such as (periodic) CSI-RS / SRS, multiple period candidate values ​​are set, and if it is necessary to change the period for power saving of the base station, the period can be dynamically changed by indicating one of the multiple period candidate values ​​pre-configured by the (group-common) DCI or MAC-CE.

[0208] For example, when the base station configures the (periodic) CSI-RS / SRS, it configures multiple period candidate values ​​such as {very short period (period per symbol), short period (period per several symbols), normal period (period per slot), long period (period per several slots), very long period (period per several tens of slots)}, and the base station dynamically indicates one of the period candidate values ​​by (group-common) DCI or MAC-CE as necessary to change the period. If the traffic situation of the base station changes from high to low, it is instructed to change the period of the DL / UL signal / channel, which was set to a short period, to a long period or a very long period in order to maintain the sleep mode for the longest time and save power consumption.

[0209] As another method, the (periodic) CSI-RS / SRS may be grouped into a plurality of groups according to a period, and the base station may adjust the period by indicating a specific group among the plurality of groups according to a (group-common) DCI or MAC CE. For example, in Release 16 NR-U, similar to SSSG switching in which the monitoring period of the UE's SS (Search Space) set is changed depending on whether the UE is inside or outside the COT (Channel Occupancy Time), the CSI-RS / SRS having a short period is set to group index #0, and the CSI-RS / SRS having a long period is set to group index #1. The base station may dynamically change the period of the (periodic) CSI-RS / SRS by indicating one of group index #0 and group index #1 as necessary.

[0210] SMTC (SSB-based RRM measurement timing configuration) is a section in which measurement resources for RRM (radio resource management) are configured, similar to DMTC (discovery measurement timing configuration) in LTE (Long Term Evolution) systems.

[0211] DMTC is a time window during which a discovery reference signal (DRS) for terminal synchronization and channel estimation can be transmitted because it is difficult to periodically transmit signals such as a primary synchronization signal (PSS), secondary synchronization signal (SSS), and common reference signal (CRS) due to the characteristics of a cell operating as a secondary cell (SCell) in LTE-LAA.

[0212] On the other hand, DRS is a signal defined for small cell enhancement in Release-12. DRS is a control signal including PSS / SSS / CRS that is transmitted periodically every 40 ms.

[0213] SMTC is also a time period in which measurement resources for RRM measurement are set in NR. In NR, since there is no reference signal that is always transmitted like CRS in LTE, RRM measurement is performed by SSS of SS / PBCH block transmitted in SMTC, PBCH (Physical Broadcast Channel)-DMRS (Demodulation Reference Signal), and CSI-RS set in active BWP. As for the settings related to SMTC, SMTC window duration, period, and timing offset are set, and multiple periods are set for SMTC1 and SMTC2. For example, multiple SMTCs are set, and a period for each of the multiple SMTCs is set. In this case, the periods of SMTC1 and SMTC2 are different, but the timing offset and SMTC window duration are the same.

[0214] As an example of applying method #2-1 or method #2-2, SSB and / or SIB (e.g., PDSCH and PDCCH scheduling SIB) and / or paging (e.g., DCI and paging messages) and / or SMTC can be considered.

[0215] That is, multiple periodicity candidate values ​​for SSB / broadcast data / SMTC are preset, and the base station can change the period by instructing one of the multiple periodicity candidate values ​​by (GC-)DCI or MAC CE. In the case of SSB / SIB, periodic transmission is required since it is a signal required for initial connection of the terminal or RRM (Radio Resource Measurement), but from the viewpoint of power saving of the base station, SSB / SIB needs to be transmitted periodically even in a situation where there is almost no data to transmit. In this case, in order to reduce the power consumption of the base station, multiple periodicity candidate values ​​are set, and it is necessary for the base station to be able to further dynamically change the period by (group-common)DCI or MAC-CE.

[0216] The dynamic periodicity change method as described above is applicable not only to (periodic) CSI-RS or SRS but also to all DL / UL signals / channels that are set and transmitted in advance. In addition, a plurality of periodicity candidate values ​​may be common to all DL / UL signals / channels, or a plurality of periodicity candidate values ​​may be set for each DL / UL signal / channel. In addition, when a periodicity change of a specific DL / UL signal / channel is instructed, the DL / UL signal / channel whose period is changed may be set or defined in advance, or the DL / UL signal / channel whose period is changed may be directly instructed.

[0217] In addition, a relationship between DL / UL signals and channels is preset, and when a change in the period of a specific signal / channel is instructed, the period of the related signal / channel is also changed. In this case, infinite or an inapplicable value is set as a preset period candidate value, and when infinite / non-numerical / inapplicable value is instructed by (GC-)DCI or MAC CE, the previous period is maintained until another instruction is given.

[0218] As an example of another DL / UL signal / channel to which method #2 can be applied, multiple periodicity candidate values ​​for SPS(semi-persistent)-PDSCH or CG(configured grant)-PUSCH are preset, and the base station indicates one of the multiple periodicity candidate values ​​by (group-common) DCI or MAC CE. As another example, SPS-PDSCH or CG-PUSCH is pre-grouped into multiple groups according to the periodicity, and the base station adjusts the period by indicating a specific group among the multiple groups by (group-common) DCI or MAC CE.

[0219] According to [Method #2], when a base station operates in NES mode to save energy, the period for periodic DL / UL signals / channels can be dynamically changed to a relatively longer period, maximizing the period during which transmission and reception of DL / UL signals / channels is not permitted (e.g., the base station's sleep mode period), and preventing the terminal from performing unnecessary measurements and reports, thereby reducing the overall power consumption of the terminal and base station.

[0220] [Method #3] A method in which multiple ON / OFF patterns are preset and a specific ON / OFF pattern is instructed by (group-common) DCI or MAC-CE

[0221] 1. Method #3-1

[0222] In addition to the ON / OFF pattern setting information, information regarding the period or timer during which the ON / OFF pattern will persist is set, or the period or timer during which the ON / OFF pattern will persist is set / indicated separately from the ON / OFF pattern setting information.

[0223] 2. Method #3-2

[0224] When the period or timer during which the ON / OFF pattern lasts ends, it switches to the ON period or switches to the next preset ON / OFF pattern and the period or timer corresponding to the next ON / OFF pattern.

[0225] Inactivity-related timers (e.g., BWPinactiveTimer, SCellinactiveTimer, dataInactivityTimer, DRX (Discontinuous Reception)-related timers) set in the terminal are held during the OFF period and resumed when the OFF period ends, or stopped during the OFF period and restarted when the OFF period ends.

[0226] A base station may also set the ON / OFF duration to be semi-static in advance, similar to the DRX cycle of the terminal, and during the ON duration, the base station may transmit and receive DL / UL signals / channels regularly, and during the OFF duration, the base station may switch the operation mode to a sleep mode / power saving mode or the like to reduce power consumption. However, this semi-static ON / OFF duration transmission / reception method can obtain the effect of energy saving due to the preset OFF duration, but when urgent traffic occurs, such as when the terminal transmits SR or PRACH in that period, the base station cannot respond immediately until the ON period, so that a large delay occurs in RAR transmission or UL grant transmission, and the performance of the terminal may be degraded. Therefore, multiple ON / OFF patterns are preset, and the base station may dynamically change the length of the ON and OFF periods by instructing a specific ON / OFF pattern among the multiple ON / OFF patterns by (group-common) DCI or MAC-CE.

[0227] For example, as shown in Fig. 9, the base station presets {Pattern 1: Always ON, Pattern 2: 1 slot ON + 9 slots OFF, Pattern 3: 2 slots ON + 8 slots off, ...} to the terminal, and dynamically instructs the terminal by (group-common) DCI or MAC-CE which of the three patterns to turn on / off the DL / UL signal / channel based on. Also, the ON / OFF pattern and the DL / UL signal / channel to which the duration of the ON / OFF pattern is applied are preset or defined (standard). Alternatively, the base station may directly instruct the DL / UL signal / channel to which the ON / OFF pattern and the duration of the ON / OFF pattern are applied.

[0228] In addition, by pre-setting an association relationship between DL / UL signals / channels, when application of an ON / OFF pattern and duration of the ON / OFF pattern is instructed to a specific signal / channel, the same ON / OFF pattern and duration of the ON / OFF pattern or a pre-defined specific ON / OFF pattern and duration of that ON / OFF pattern may be applied to the related signal / channel.

[0229] For example, as in [Method #1], when a periodic CSI-RS and a periodic SRS are pre-configured as being associated with each other, when an ON / OFF pattern and the duration of that ON / OFF pattern are indicated for the P-CSI-RS by a (group-common) DCI or MAC-CE, the P-SRS may also be transmitted and received according to that ON / OFF pattern and duration, or the P-SRS may be transmitted and received according to a specific ON / OFF pattern pre-defined for the P-SRS and the duration of that ON / OFF pattern.

[0230] According to [Method #3], the base station sets ON / OFF for multiple time intervals in a pattern form by one signaling, thereby reducing the power consumption of the terminal and the base station and reducing the signaling overhead for instructing ON / OFF for multiple time intervals. In addition, the signaling overhead is reduced and the ON / OFF pattern is dynamically changed according to the operation status of the cell, minimizing the scheduling latency of the terminal and minimizing the performance degradation of DL / UL, thereby enabling efficient energy saving.

[0231] [Method #4] Advanced terminal operation when the base station operates in power saving mode, for example, power saving mode means that DL / UL signals / channels are transmitted / received based on OFF duration / timer / pattern according to Method #1, Method #2 and / or Method #3 of the present disclosure.

[0232] 1. Method #4-1

[0233] No penalty is applied for PRACH transmission failure. For example, the penalty means applying power ramping, a preamble counter, and / or a preamble back off. Also, PRACH transmission failure means that the terminal does not receive the RAR from the base station.

[0234] 2. Method #4-2

[0235] An RO (RACH Occasion) assigned to a section where the RAR window and the OFF duration overlap is treated as invalid.

[0236] 3. Method #4-3

[0237] No penalty is applied for a failed SR transmission (not receiving a response to the SR transmission). For example, the penalty may mean applying an SR counter and / or a prohibit timer. Also, a failed SR transmission means that a response (e.g., a UL grant) to the UE's SR transmission is not received from the base station.

[0238] 4. Method #4-4

[0239] The SSB cycle and RO (RACH occasion) in the power saving mode are linked, and the SSB-to-RO mapping is implicitly changed by changing the SSB cycle.

[0240] 5. Method #4-5

[0241] SRS / CSI report / CG-PUSCH resources that overlap or are correlated with the OFF period are turned OFF.

[0242] 6. Method #4-6

[0243] In normal mode, more relaxed RAN4 requirements apply.

[0244] 7. Method #4-7

[0245] In order to save power, some of the pre-set POs (Paging Occasions) are invalidated for the NES.

[0246] When a base station operates by applying an OFF interval / timer / pattern to the base station and terminal, such as method #1, method #2 and / or method #3 of the present disclosure, for power saving, during that time interval, transmission and reception of specific DL / UL signals / channels or all DL / UL signals / channels is turned OFF (deactivation), so a different criterion is required than for subsequent operation of the terminal when transmitting and receiving a specific signal / channel defined in the ON interval.

[0247] For example, when a base station is operating in normal mode, if a terminal transmits a PRACH but fails to receive an RAR within the RAR window, the standard defines that the base station should ramp the transmission power of the PRACH and retransmit it, increase the counter value, and perform subsequent operations such as backing off when a specific power value (e.g., maximum power) or the maximum counter value is reached, and selecting another PRACH preamble and attempting to retransmit.

[0248] However, when the base station operates in a power saving mode, it is set not to allow PRACH reception in the OFF period, so that when the terminal transmits PRACH in that period, the base station may not be able to completely receive the PRACH transmitted by the terminal and therefore may not be able to transmit the RAR, and may not attempt reception because the channel itself is turned off. Therefore, in this case, a criterion different from the conventionally defined subsequent terminal operation is required.

[0249] For example, the following operation of the terminal is defined as in the method #4 for an advanced terminal that can receive and apply settings / instructions related to the power saving mode of the base station, as in the method #1, method #2, and method #3 of the present disclosure. In this case, in the case of a legacy terminal, since it may not have the capability to apply settings / instructions related to the power saving mode of the base station, it may be necessary to follow the conventional procedure defined in the standard for the power saving of the base station, and a penalty may occur.

[0250] As in the above example, when a base station operates in a power saving mode by applying a method such as an OFF period / timer / pattern and an advanced terminal capable of receiving and applying a base station's configuration / instruction transmits / receives DL / UL signals / channels with the base station, a penalty for PRACH transmission failure may not be applied in the OFF period / timer / pattern. For example, the penalty may mean applying power ramping, a preamble counter, and / or a preamble backoff as described above. In addition, a PRACH transmission failure may mean a case where the terminal cannot receive an RAR or a contention resolution message.

[0251] In other words, even if the terminal transmits the PRACH but fails to receive the RAR, the base station may assume that the PRACH was not received intentionally due to a preset / instructed OFF period / timer / pattern, and may not follow the subsequent procedure defined when the conventional RAR was not received. For example, the terminal may not perform power ramping for the PRACH, may not apply a preamble counter and backoff, and may wait until the ON period to transmit the PRACH again. That is, when the terminal enters the ON period, the terminal may transmit the PRACH again with the same power as the PRACH transmitted in the OFF period, and may not increase or decrease the preamble counter and backoff.

[0252] In addition, when a terminal transmits a PRACH in a specific RO, an RAR window linked to the RO is set, and only when an RAR, which is a response to the PRACH, is received within that period is the Msg1 transmission considered successful. However, if the RAR window linked to a specific RO overlaps with the OFF period / timer / pattern of the base station, the base station does not transmit in that period, so RAR transmission cannot be expected. Therefore, in order to prevent unnecessary PRACH transmission in an RO assigned to a period where the RAR window and the OFF period overlap, the RO is processed as invalid.

[0253] When UL data to be transmitted occurs in a buffer, the terminal transmits a PUCCH using a Scheduling Request (SR) resource preset by the base station. When the base station completely receives the SR PUCCH transmitted by the terminal, the base station transmits an UL grant and allocates resources for the UL transmission of the terminal. However, if the UL grant cannot be received from the base station, a penalty for SR transmission failure defined in the standard is applied, as with PRACH. For example, the penalty means application of an SR counter and / or an SR prohibit timer. Also, an SR transmission failure means that a response (e.g., an UL grant) to the SR transmission of the terminal cannot be received from the base station.

[0254] However, as described above, since the base station intentionally did not receive an SR when the base station operates in a power saving mode, the transmission of the UL grant is also turned off within the OFF period / timer / pattern set by the base station for power saving due to reasons such as non-reception of the PRACH RAR, and therefore penalties such as an SR counter or an SR prevention timer may not be applied to the SR transmission when the base station operates in a power saving mode.

[0255] Also, in the OFF period / timer / pattern for the power saving mode operation, the transmission of SSB is included. Meanwhile, since there is a mapping relationship between SSB and RO, when the SSB period is changed or the number of SSBs to be transmitted is reduced, the SSB to RO mapping needs to be changed accordingly. In this case, the changed SSB to RO mapping relationship may be explicitly indicated, but it may be implicitly changed by a prearrangement (e.g., defined in a standard) or by a presetting by the base station, instead of indicating every time an event occurs. For example, if the SSB period is changed to a larger value or the number of SSBs is changed to a smaller value, the SSB is mapped to the RO every N radio frames or every multiple of N radio frames, or the SSB is mapped to the RO only in some radio frames near the SSB (e.g., after the SSB is transmitted).

[0256] Similarly, for SRS / CSI report / CG-PUSCH resources that overlap or are correlated with the OFF period / timer / pattern, an advanced terminal can turn off the resource and report and not transmit, even without a separate instruction / configuration from the base station. In addition, when the base station operates in power saving mode, more relaxed RAN4 requirements are applied than when it operates in general mode. For example, cell selection / reselection criterion, RRM measurement related requirements, and / or time and frequency tracking / offset are relaxed than when it operates in general mode.

[0257] As another method, some of the preset POs (Paging Occasions) can be invalidated for NES to save power. This method causes some loss for legacy terminals, but advanced terminals can recognize invalid POs, and the base station can actually save power by not transmitting on some of the invalidated POs.

[0258] According to [Method #4], if the reason why the PRACH procedure or procedures after SR transmission are not actually performed is due to power saving mode, by not giving a penalty, it is possible to prevent interference from occurring in the transmission and reception of other terminals due to PRACH transmission and SR transmission, and it is possible to prevent unnecessary penalties from being given to the terminal.

[0259] [Method #5] A method in which a base station notifies a terminal in initial connection or idle (or inactive) mode of the base station's power saving mode operation

[0260] 1. Method #5-1

[0261] The base station informs the terminal of whether the associated serving cell (or base station) is currently operating in a power saving mode or not by using a pre-agreed SSB pattern / SIB / PBCH / paging DCI, or informs the terminal that the cell is capable of operating in a power saving mode (even if it is not currently operating in a power saving mode).

[0262] (1) In the case of an initial connecting terminal, it is determined whether or not to connect to the cell based on the SSB pattern or SIB / PBCH (Physical Broadcast Channel) information.

[0263] (2) Differentiate the current SIB1 barring interpretation or barring indication so that legacy terminals are cell barred as they are and cannot connect to a cell or base station, while advanced terminals can connect to a cell or base station.

[0264] In the case of an initial access terminal or an idle / inactive terminal, it is necessary to know whether the base station to which the terminal is trying to access or has been camped on is operating in a power saving mode or is currently operating in a normal mode but can be switched to a power saving mode to operate. For example, when the base station operates in a power saving mode by applying an OFF period / timer / pattern such as method #1 and / or method #2 and / or method #3 of the present disclosure, in the case of a legacy terminal, when the base station does not transmit a response to PRACH or SR to the terminal, the terminal performs the penalty procedure defined conventionally as illustrated in method #4 and continues to retransmit PRACH or SR unnecessarily, thereby unnecessarily consuming power. In addition, procedures such as BWP switching and cell reselection may be triggered unnecessarily.

[0265] Therefore, a base station needs to inform a terminal in an initially connected or idle / inactive mode that the base station is operating in a power saving mode or is a cell capable of operating in a power saving mode by a pre-provisioned SSB pattern / SIB / PBCH / Paging DCI.

[0266] For example, a specific multiplexing pattern of SSB and Type0-PDCCH or a specific FR1 / FR2 SCS (subcarrier spacing) combination is indicated. Alternatively, whether or not the base station is operating in a power saving mode and the operability are set by information in SIB1, PBCH, or paging DCI. In particular, in the case of SIB1, the interpretation of the cell barring indication or the cell barring indication itself is divided into a legacy terminal and an advanced terminal, and when a setting indicating that the base station is operating in a power saving mode or can operate in a power saving mode is received, the legacy terminal can perform a cell barring operation as it is and attempt to camp on another cell without camping on the base station, and an advanced terminal supporting the power saving mode operation of the base station can connect to the base station.

[0267] The types of periodic DL / UL signals / channels to which the method proposed in the present disclosure can be applied include not only periodic CSI-RS / SRS but also semi-persistent (SPS) PDSCH / PUSCH / CSI-RS and CG-PUSCH transmitted based on a resource configuration in advance. In addition, in the present disclosure, when the DL / UL signals / channels are instructed to be OFF during a specific time period by (group-common) DCI, MAC-CE, or a timer, or the period of the periodic DL / UL signals / channels is dynamically adjusted, or when the base station and terminals are to save energy by a plurality of preset ON / OFF patterns, the ON / OFF period / pattern in the time domain may be used only in a specific carrier / cell.

[0268] Alternatively, it may be extended to multiple carriers / cells through an interface between gNBs (e.g., X2 interface) or an interface between a gNB and a core network (e.g., S1 interface), and a common time domain ON / OFF period / pattern may be applied between the multiple carriers / cells. In this case, the period in which the time domain ON / OFF period / pattern is applied in common between the multiple carriers / cells may be limited to a part of the entire period.

[0269] According to [Method #5], cell reselection and cell bearing are applied differently depending on whether the base station is operating in a power saving mode and whether the terminal supports the power saving mode, thereby preventing the base station from judging the measurement state as if it were a general mode, even though it is a natural measurement state due to the OFF period, and thereby preventing unnecessary cell changes and the unnecessary concentration of multiple terminals in one cell.

[0270] [Method #6] A method in which a base station notifies a terminal of a change in operation mode of the base station (e.g., a change between non-NES mode and NES mode) by a group-common (or cell-specific) DCI or MAC-CE, and a method in which at least one configured timer is restarted

[0271] 1. Method #6-1

[0272] A common CSS (Common Search Space) is set for monitoring switching instructions between non-NES mode and NES mode.

[0273] 2. Method #6-2

[0274] A new type of CSS for NES is introduced.

[0275] 3. Method #6-3

[0276] A new Radio Network Temporary Identifier (RNTI) for NES-indicated monitoring in certain types of CSS is introduced.

[0277] 4. Method #6-4

[0278] For a terminal configured with C-DRX, during inactive time or while operating with DRX configuration and / or DRX group for NES, the terminal does not expect to receive CSI-RS and does not perform measurements and reports.

[0279] 5. Method #6-5

[0280] (Group-common) DCI missing issues are handled.

[0281] 6. Method #6-6

[0282] The base station indicates time offset information indicating the time interval (or distance) from the time of MAC CE or DCI indication to the time when the application of the NES mode starts, either absolutely or relatively, together with the switching of the operation mode of the base station. Alternatively, the application time when the application of the NE mode starts is pre-configured or defined (standard).

[0283] 7. Method #6-7

[0284] When the base station is indicated by the group-common DCI or MAC-CE to switch from NES mode to non-NES mode, all timers currently running in the terminal (e.g., inactivity timers) are restarted.

[0285] In the proposed method of the present disclosure, multiple OFF durations are set in advance, and the base station indicates one of the OFF durations by (group-common) DCI or MAC-CE, and indicates the OFF of DL / UL signals / channels during a specific time duration. Alternatively, multiple candidate values ​​of periodicity of (periodic) CSI-RS / SRS are set in advance, and the base station indicates one of the periodicity values ​​by (group-common) DCI or MAC CE. Alternatively, multiple ON / OFF patterns are set in advance, and the base station indicates a specific pattern from among the multiple ON / OFF patterns by (group-common) DCI or MAC-CE.

[0286] In order to indicate an OFF period, an ON / OFF pattern, and a period by a (group-common) DCI or MAC-CE as in the above-mentioned proposed method, the base station sets a common search space (CSS) for receiving group-common DCI or MAC-CE in the terminal, or sets a new type of CSS. Alternatively, a specific RNTI for NES mode switching indication monitoring is promised / set in a specific type of CSS.

[0287] For example, one of the conventional CSS types (e.g., Type0 / 0A / 1 / 2 / 3-CSS) is used as the CSS for NES mode switching instruction, and multiple common or group-based MOs (monitoring occasions) are set in consideration of the onDuration or PO of the terminal with C-DRX or I-DRX configured. Also, a new type of CSS for NES instruction is introduced in addition to the conventional CSS types.

[0288] Alternatively, a new RNTI for receiving an NES indication is introduced in addition to the current RNTI for search space monitoring. Meanwhile, in a state where a PDCCH monitoring window for an NES mode switching indication is periodically set, the terminal operates to monitor for an NES mode switching indication during the PDCCH monitoring window period, and if there is no NES mode switching indication detected during the PDCCH monitoring window period, the terminal applies the NES mode switching indication received immediately before or operates based on a preset default mode (e.g., non-NES mode).

[0289] Meanwhile, when the terminal enters a connected mode after initial connection to the base station, it is necessary to continuously perform PDCCH monitoring to check whether there is a transmission scheduled for the terminal for each set SS (Search Space). However, if there is not always a schedule, it is wasteful to perform PDCCH monitoring operation every time and quickly drain the terminal's battery. Therefore, the base station can set a time period (e.g., an ON period) in which PDCCH monitoring should be performed and an OFF period in which PDCCH monitoring is not required, and set C-DRX (connected mode discontinuous reception) to obtain the effect of power saving for the terminal.

[0290] The terminal monitors the PDCCH during a periodic ON duration to check whether there is a DL / UL to transmit or receive, and when the PDCCH is received, it performs DL reception or UL transmission according to the instruction. In the case of the terminal's UL, regardless of C-DRX, if there is data to send in the UL buffer, it can wake up and transmit an SR even in sleep mode, and in the case of a terminal in idle mode, it periodically monitors paging and operates in Idle mode DRX (I-DRX) where it goes back to sleep if it is not a target UE.

[0291] Here, the term "operating in sleep mode" means "regardless of the active time determined by C-DRX" or "even during a period other than the active time determined by C-DRX". The base station can switch to an energy saving mode for power saving during a period other than the OFF duration or active time of the terminal.

[0292] Furthermore, when the base station configures C-DRX in the terminal by RRC, two DRX groups having separate DRX parameters are configured.

[0293] In this case, the DRX parameters that are set separately for each DRX group are drx-onDurationTimer and drx-InactivityTimer, and the DRX parameters that are common to the DRX group are drx-SlotOffset, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, drx-LongCycleStartOffset, drx-ShortCycle(optional), drx-ShortCycleTimer(optional), drx-HARQ-RTT-TimerDL, drx-HARQ-RTT-TimerUL, and uplinkHARQ-Mode(optional).

[0294] Also, if no secondary DRX group is configured, all serving cells are included in only one DRX group (e.g., default DRX group). On the other hand, if two DRX groups are configured, each serving cell is uniquely assigned to one of the two DRX groups. Thus, the secondary DRX group is configured selectively, and if no secondary DRX group is configured and only one DRX group is configured, an NES DRX group is further configured in that DRX group or parameters for NES are configured, and the above-mentioned method is applied.

[0295] In addition to the above-mentioned C-DRX configuration and DRX parameters, the base station may additionally configure a DRX configuration for NES for ES. In this case, the DRX configuration for NES is a group-common DRX parameter, unlike parameters included in the conventional UE-specific DRX configuration, in order to improve the ES of the base station.

[0296] As described above, this means changing the duration timer or inactivity timer of the terminal and adjusting the inactivity time of the terminal in the cell for the ES purpose of the base station. There may be one or more DRX configurations for the NES (e.g., multiple DRX configurations), and a DRX group for the NES may be introduced in addition to the conventional primary DRX group and secondary DRX group.

[0297] When P(periodic) / SP(semi-persistent)-CSI-RS is configured for a terminal configured with C-DRX, the terminal performs measurement in the configured CSI-RS resource regardless of the active time, and performs CSI reporting only within onDuration when the active time or csi-Mask is configured. However, during the inactive time of the terminal, the base station also has an opportunity to switch to the NES mode to save energy, but since it cannot operate in a sleep mode to transmit p / SP-CSI-RS, the base station does not transmit CSI-RS during the inactive time of the terminal for NES from the perspective of saving energy of the base station. Therefore, the terminal operating in C-DRX does not expect to receive CSI-RS during the inactive time period or while operating in a DRX configuration / group for NES, and does not perform measurement and reporting. Alternatively, when the terminal receives an instruction to switch to the NES mode from the base station, the terminal does not expect to receive CSI-RS and does not perform measurements and reports.

[0298] In addition, since a terminal may not receive or fail to receive the NES mode switching instruction transmitted by the base station through the group-common DCI or MAC CE, the base station may repeatedly transmit the NES mode switching instruction through the group-common DCI or MAC CE. In addition, since it is practically difficult for the base station to receive HARQ-ACK feedback for the NES mode switching instruction individually from each terminal, a default terminal operation when the terminal cannot detect the group-common DCI or MAC-CE or misses the group-common DCI or MAC-CE transmitted by the base station is pre-defined / set.

[0299] The basic terminal operation is set in a direction that minimizes the impact on the system / terminal when the NES mode switching instruction is missing. For example, in a situation where CSI-RS transmission is turned off during the inactive time, if the base station's default operation is set to CSI-RS OFF (i.e., the terminal omits CSI-RS reception) and there is no NES plan, the base station instructs CSI-RS ON by DCI. In other words, even if the base station instructs CSI-RS ON by DCI and transmits CSI-RS, if the terminal misses the group-common DCI or MAC-CE transmitted by the base station, it does not have to receive CSI-RS according to the basic operation (i.e., CSI-RS OFF).

[0300] As another example, in a situation where the base station instructs switching from non-NES mode to NES mode and turns off CSI-RS transmission, when the base station switches from a state in which the basic (default) operation is set to CSI-RS OFF (i.e., the terminal does not expect to receive CSI-RS) to non-NES mode, it instructs to turn CSI-RS ON. In other words, even if the base station instructs to turn CSI-RS ON in DCI and transmits CSI-RS, if the terminal misses the group-common DCI or MAC-CE transmitted by the base station, it does not have to receive CSI-RS according to the basic operation (i.e., CSI-RS OFF).

[0301] Meanwhile, even when the terminals receive the NES mode switch instruction, since the time when the instruction is applied varies for each terminal, the NES mode switch instruction itself indicated by the group-common DCI or MAC CE may indicate the application time together and start at a specific time. For example, when the instruction is indicated by the group-common MAC-CE, taking into consideration the time it takes for the base station to retransmit the MAC CE when the terminal reports a NACK in response to the instruction, or the time it takes to repeatedly transmit multiple times when indicated by the GC DCI, relative or absolute time offset information for whether the NES mode switch is started / operated after a predetermined time from the time when the MAC CE or DCI is indicated is indicated together with the NES mode switch instruction, or is pre-configured / defined in the standard.

[0302] Here, the relative time offset indicates how long (e.g., after several slots / symbols) after the reception of the GC-DCI or GC-MAC CE NES mode switching instruction the NES mode switching is applied. Also, for example, the absolute time offset indicates that the NES mode switching is initiated / applied after a specific slot (e.g., after 10 slots) from a specific SFN (e.g., SFN=0). Also, when the base station indicates the switching from NES mode to non-NES mode by the group-common DCI or MAC-CE, all timers (e.g., inactivity timer) currently running in the terminal are restarted.

[0303] In the above method, the DRX configuration for NES or the cell-specific DRX configuration means a (cell-specific) DTX / DRX pattern or an active / inactive pattern in which a period during which the base station minimizes transmission / reception or completely turns off transmission / reception and a period during which the base station performs general operation are periodically repeated during a time period agreed / set in advance (e.g., in a standard document) for the purpose of saving energy in the base station.

[0304] For example, as an example of a DRX configuration for the purpose of NES, a terminal does not perform PDCCH monitoring even during active time in one DRX cycle, and omits reception of common signals / channels such as SSB / SIB1 even in time intervals outside active time, or receives only at a very long period. Also, even if signals such as PDCCH / PDSCH / CSI-RS / PRS / PUCCH / PUSCH / SRS are configured to be repeatedly transmitted and received outside active time, transmission and reception are not performed using resources for those signals / channels.

[0305] In addition, when cell-specific DTX / DRX is set or applied, an NES mode / state is defined. When an NES mode / state is set / indicated, it is preset to save energy by turning off transmission / reception of some or all DL / UL signals during a specific time period in which the terminal operates in the NES mode, reducing the amount of frequency resources to be transmitted / received, reducing the number of antenna ports used for transmission, or lowering the transmission power. In addition, a BWP for NES refers to a specific BWP that is switched when NES mode=ON is instructed. This BWP for NES refers to a BWP configured only with RBs in which the BW, which is the amount of frequency resources, is very small among the BWPs set in the terminal.

[0306] If a base station operates in non-NES mode (i.e., instructs / sets NES mode=OFF to terminals in a cell), DL / UL signal transmission and reception can be expected to be the same as in the operation of a general base station. Also, the DRX configuration for NES may be the same as the C-DRX / I-DRX for conventional terminals.

[0307] It may also mean that the time-domain ON / OFF patterns of multiple pre-agreed DL / UL signals / channels are dynamically indicated by L1 (e.g., group-common DCI) / L2 (e.g., MAC-CE) signaling.

[0308] According to [Method #6], by specifying a CSS that receives instructions regarding NES operation mode switching or by defining the application time of NES operation mode switching and the terminal operation within the DRX cycle, it is possible to efficiently instruct NES operation mode switching and ensure that NES operation mode switching is performed without any missing instructions from the base station.

[0309] [Method #7] A method in which a serving cell notifies a neighbor cell of information such as whether the serving cell is operating on NES, or a serving cell notifies a UE of information regarding whether the neighbor cell is operating on NES

[0310] When the base station operates in the NES mode according to various energy saving methods proposed in this disclosure, unlike when it operates in the non-NES mode, a specific DL / UL signal (e.g., SSB) is not transmitted during a specific time period or is transmitted at a very long period. Here, the base station operates in the NES mode means that the (group-common) DCI or MAC-CE instructs the DL / UL signal / channel to be OFF during a specific time period, or the periodicity of the periodic DL / UL signal / channel is dynamically adjusted. Alternatively, it means that a plurality of ON / OFF patterns are preset and a specific pattern is dynamically instructed by the (group-common) DCI or MAC-CE, or the operation mode is switched (e.g., between the non-NES mode and the NES mode) by the group-common (or cell-specific) DCI or MAC-CE.

[0311] For example, if a certain cell's SSB is not transmitted during a certain time period, it affects neighbor cell measurements for RRM of the neighbor cell and the UE. In this case, if conventional criteria (e.g., RSRP threshold) are applied as is, procedures such as cell (re)selection or HO (handover) may be unnecessarily triggered.

[0312] Therefore, when a serving cell operates in the NES mode by applying the method proposed in the present disclosure, it can inform neighbor cells located near the serving cell of information regarding the presence or absence of NES operation, such as information regarding a time period during which a specific DL / UL signal / channel is turned off, information regarding a periodic change of a specific DL / UL signal / channel, or information regarding an ON / OFF pattern. By informing the neighbor cells of information regarding the presence or absence of NES operation, unnecessary procedures can be prevented in advance, and the neighbor cells can supplement problems caused by the serving cell operating in the NES mode or increase NES gain through cooperation between cells. Here, the neighbor cells supplement problems caused by the NES mode operation by, for example, transmitting SSB / SIB1 information instead of the serving cell.

[0313] Meanwhile, a serving cell may inform a currently camped-on UE of the presence or absence of NES operation of one or more neighbor cells located around it. As described above, when a base station (e.g., a serving cell) operates in the NES mode, SSB / SIB1 and common signals / channels may also be turned off and not transmitted, so a neighbor cell may inform a UE in the serving cell of information regarding the NES mode operation of the serving cell or neighbor cell by a signal such as SI (system information), a cell-specific or UE-specific RRC signal, or a group-common DCI / MAC-CE.

[0314] Here, the information on the NES mode operation includes ON / OFF patterns of specific DL / UL signals / channels, ON / OFF of common signals / channels such as SSB / SIB1, or changed period and / or ON / OFF of the dynamic NES mode of the neighboring cell. Based on the information, the terminal may not perform RRM measurements during the time interval when the neighboring cell turns off the SSB, or may perform measurements but discard / ignore the results as invalid and not report them to the serving cell.

[0315] According to [Method #7], by transmitting information regarding the NES mode of not only the serving cell but also neighboring cells to the terminal, it is possible to compensate for problems caused by the NES mode of the serving cell or determine intervals in which transmission and reception of DL / UL signals / channels from neighboring cells is not required, thereby increasing the power saving effects of the terminal, neighboring cells, and serving cell.

[0316] Without being limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or flow charts disclosed in this document may be applied to various fields requiring device-to-device wireless communication / connections (e.g., 5G).

[0317] Hereinafter, the present invention will be described in more detail with reference to the drawings. In the following drawings / description, the same reference numerals denote the same or corresponding hardware blocks, software blocks or function blocks unless otherwise specified.

[0318] FIG. 10 illustrates a communication system 1 to which the present disclosure is applied.

[0319] Referring to FIG. 10, the communication system 1 applied to the present invention includes wireless devices, base stations, and networks. Here, the wireless devices refer to devices that communicate using wireless connection technology (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, 100b-2, an XR (eXtended Reality) device 100c, a handheld device (Hand-held Device) 100d, a home appliance 100e, an IoT (Internet of Thing) device 100f, and an AI server / device 400. For example, the vehicles include vehicles equipped with wireless communication functions, autonomous vehicles, vehicles capable of inter-vehicle communication, and the like. Here, the vehicles include UAVs (Unmanned Aerial Vehicles) (e.g., drones). XR devices include Augmented Reality (AR) / Virtual Reality (VR) / 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. Portable devices include smartphones, smart pads, wearable devices (e.g., smart watches, smart glasses), computers (e.g., notebook computers, 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.

[0320] The wireless devices 100a to 100f are connected to a network 300 via a base station 200. AI (Artificial Intelligence) 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, the vehicles 100b-1 and 100b-2 can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Also, an IoT device (e.g., a sensor) can directly communicate with another IoT device (e.g., a sensor) or another wireless device 100a to 100f.

[0321] Wireless communication / connections 150a, 150b, and 150c are performed between the wireless devices 100a to 100f / base stations 200 and the base stations 200. Here, the wireless communication / connections are performed by 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, IAB (Integrated Access Backhaul) (e.g., 5G NR). Through the wireless communication / connections 150a, 150b, and 150c, the wireless devices and base stations, and the base stations and base stations can transmit / receive wireless signals to each other. For example, the wireless communication / connections 150a, 150b, and 150c can transmit / receive signals via various physical channels. To this end, based on 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.

[0322] FIG. 11 illustrates a wireless device applicable to the present disclosure.

[0323] 11, 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), where {first wireless device 100, second wireless device 200} corresponds to {wireless device 100x, base station 200} and / or {wireless device 100x, wireless device 100x} in FIG.

[0324] 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 a first information / signal, and then transmits a wireless signal including the first information / signal 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 / signal 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 performing 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.

[0325] Specifically, the following describes instructions and / or operations controlled by processor 102 and stored in memory 104 of first wireless device 100 in accordance with an embodiment of the present disclosure.

[0326] The following operations are described in terms of processor 102 and based on controlling operations of processor 102, with software code or the like for performing such operations stored in memory 104. For example, in the present disclosure, at least one memory 104 is a computer readable storage medium that stores instructions or programs that, when executed, cause at least one processor operably coupled to the at least one memory to perform operations according to embodiments or implementations of the present disclosure relating to the following operations.

[0327] For example, the processor 102 receives information about the NES operation of the base station through the transceiver 106. For example, the information about the NES operation is information about ON / OFF for one or more time intervals, or information about whether the base station is operating in the NES mode. Alternatively, the information is information about the period of the DL / UL signal / channel in the NES mode. For example, the processor 102 receives information about the NES operation through the transceiver 106 based on at least one of [Method #1] to [Method #7].

[0328] The processor 102 transmits and receives the DL / UL channel in one or more time intervals through the transceiver 106 based on the information regarding the NES operation. For example, the processor 102 transmits and receives the DL / UL channel through the transceiver 106 based on at least one of [Method #1] to [Method #7].

[0329] 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 a 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 the 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 performing 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 by 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 also means a communication modem / circuit / chip.

[0330] Specifically, the following describes instructions and / or operations controlled by processor 202 and stored in memory 204 of second wireless device 200 in accordance with an embodiment of the present disclosure.

[0331] The following operations are described in terms of processor 202 and based on controlling operations of processor 202, with software code or the like for performing such operations stored in memory 204. For example, in the present disclosure, at least one memory 204 is a computer readable storage medium that stores instructions or programs that, when executed, cause at least one processor operatively coupled to the at least one memory to perform operations according to embodiments or implementations of the present disclosure relating to the following operations:

[0332] For example, the processor 202 transmits information about the NES operation of the base station through the transceiver 206. For example, the information about the NES operation is information about ON / OFF for one or more time intervals, or information about whether the processor 202 is operating in the NES mode. Alternatively, the information is information about the period of DL / UL signals / channels in the NES mode. For example, the processor 202 transmits information about the NES operation through the transceiver 206 based on at least one of [Method #1] to [Method #7].

[0333] The processor 202 transmits and receives DL / UL channels in one or more time intervals through the transceiver 206 based on the information regarding the NES operation. For example, the processor 202 transmits and receives DL / UL channels through the transceiver 206 based on at least one of [Method #1] to [Method #7].

[0334] The hardware elements of the wireless device 100, 200 are described in more detail below. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102, 202. For example, the one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, 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 may generate and provide 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 to the one or more transceivers 106, 206. The one or more processors 102, 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and derive the PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and / or flowcharts disclosed herein.

[0335] The one or more processors 102, 202 may also be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. As an 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 implemented to include modules, procedures, functions, and the like. The 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 run 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.

[0336] The one or more memories 104, 204 may be coupled to the one or more processors 102, 202 and may store various forms of data, signals, messages, information, programs, code, instructions, and / or commands. 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.

[0337] One or more transceivers 106, 206 may transmit user data, control information, wireless signals / channels, etc., as described in the methods and / or flow charts, etc., herein to one or more other devices. One or more transceivers 106, 206 may receive user data, control information, wireless signals / channels, etc., as described in the descriptions, functions, procedures, suggestions, methods and / or flow charts, etc., disclosed herein from one or more other devices. For example, one or more transceivers 106, 206 may be coupled to one or more processors 102, 202 to transmit and receive wireless signals. For example, one or more processors 102, 202 may 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 may control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. The one or more transceivers 106, 206 are also coupled to one or more antennas 108, 208, and the one or more transceivers 106, 206 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 flow charts disclosed herein, via the one or more antennas 108, 208. In this specification, the one or more antennas may be 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 using the one or more processors 102, 202. The one or more transceivers 106, 206 convert the user data, control information, radio signals / channels, etc., processed using the one or more processors 102, 202, from baseband signals to RF band signals. To this end, the one or more transceivers 106, 206 include (analog) oscillators and / or filters.

[0338] 12 illustrates an example of a vehicle or an autonomous vehicle to which the present invention is applied. The vehicle or the autonomous vehicle may be realized as a mobile robot, a car, a train, an aerial vehicle (AV), a ship, or the like.

[0339] 12, a vehicle or an autonomous vehicle 100 includes 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 is a part of the communication unit 110.

[0340] 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, road side 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 run on the ground. The driving unit 140a includes 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 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, a tilt sensor, a weight 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 embodies a technology for maintaining a lane while driving, a technology for automatically adjusting speed such as an adaptive cruise control, a technology for automatically driving according to a predetermined route, a technology for automatically setting a route when a destination is set, and the like.

[0341] 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 drive plan based on the obtained data. The control unit 120 controls the driving unit 140a (e.g., speed / direction adjustment) so that the vehicle or autonomous driving vehicle 100 moves along the autonomous driving route according to the drive plan. The communication unit 110 non-periodically obtains the latest traffic information data from an external server during autonomous driving, and also obtains surrounding traffic information data from surrounding vehicles. In addition, the sensor unit 140c obtains vehicle status and surrounding environment information during autonomous driving. The autonomous driving unit 140d updates the autonomous driving route and drive plan based on the newly obtained data / information. The communication unit 110 transmits information regarding the vehicle position, the autonomous driving route, the drive plan, etc. to an external server. The external server predicts traffic information data in advance using AI technology, etc. based on information collected from the vehicle or autonomous driving vehicle, and provides the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0342] The above-described embodiments are combinations of the components and features of the present invention in a predetermined form. Each component or feature should be considered as optional unless otherwise expressly stated. Each component or feature may be implemented in a form not combined with other components or features. Also, some components and / or features may be combined to form an embodiment of the present invention. The order of each operation described in the embodiments of the present invention may be changed. Some configurations or features of any embodiment may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is obvious that claims that are not explicitly cited in the claims may be combined to form an embodiment, or may be included as a new claim by amendment after filing.

[0343] In this document, a specific operation that is said to be performed by a base station may be performed by its upper node in some cases. That is, in a network consisting of a plurality of network nodes including a base station, various operations performed for communication with a terminal may be performed by the base station or other network nodes other than the base station. In this case, the base station may be replaced with terms such as a fixed station, gNode B (gNB), Node B, eNode B (eNB), or an access point.

[0344] It is obvious to those skilled in the art that the present disclosure can be embodied in other specific forms without departing from the characteristics of the present disclosure. Therefore, the above detailed description should not be interpreted as limiting in all respects, but should be considered as illustrative. The scope of the present invention should be determined by a 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. [Industrial Applicability]

[0345] The above-mentioned method and device for transmitting and receiving uplink channels and downlink channels have been described mainly as being applied to a 5th generation NewRAT system, but may be applied to various wireless communication systems other than the 5th generation NewRAT system.

Claims

1. A method for a terminal to transmit an uplink (UL) signal or receive a downlink (DL) signal in a wireless communication system, comprising: receiving information regarding at least one first time interval that is unavailable; transmitting the UL signal or receiving the DL signal during at least one second time interval that is not the at least one first time interval; In the at least one first time period, the UL signal is not transmitted and the DL signal is not received; The information regarding the at least one first time interval is received by a Downlink Control Information (DCI) or a Medium Access Control-Control Element (MAC-CE); Signal transmission and reception methods.

2. the at least one first time interval being one of a plurality of first time intervals that are not available, the information indicating such one; The signal transmitting and receiving method according to claim 1 .

3. the at least one first time interval is at least one symbol indicated as unavailable by a Slot Format Indicator (SFI); The signal transmitting and receiving method according to claim 1 .

4. the at least one second time interval is at least one symbol after a timer corresponding to the at least one first time interval expires. The signal transmitting and receiving method according to claim 1 .

5. The DL signal is received and the UL signal is transmitted in the at least one first time period based on whether the DL signal is a Synchronization Signal Block (SSB) or a Channel State Information-Reference Signal (CSI-RS), or the UL signal is a Physical Random Access Channel (PRACH); The signal transmitting and receiving method according to claim 1 .

6. Based on monitoring a Physical Downlink Control Channel (PDCCH) in the at least one first time interval, a period of a Search Space (SS) set for the at least one first time interval is longer than a period of a Search Space (SS) set for the at least one second time interval; The signal transmitting and receiving method according to claim 1 .

7. The information about the at least one first time period is for informing a pattern consisting of the at least one first time period and the at least one second time period, Information regarding a duration during which the pattern is applied is also received by the DCI or the MAC-CE. The signal transmitting and receiving method according to claim 1 .

8. UL transmission or DL ​​reception is performed in a time resource after the end of the period. The signal transmitting and receiving method according to claim 7.

9. After the end of the period, UL transmission or DL ​​reception is performed based on another pattern different from the pattern and the period corresponding to the other pattern. The signal transmitting and receiving method according to claim 7.

10. A terminal for transmitting an uplink (UL) signal or receiving a downlink (DL) signal in a wireless communication system, At least one transceiver; At least one processor; 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 operations; The operation includes: receiving, by the at least one transceiver, information regarding at least one first time interval that is unavailable; transmitting, by the at least one transceiver, the UL signal or receiving, by the at least one transceiver, the DL signal during at least one second time interval that is not the at least one first time interval; In the at least one first time period, the UL signal is not transmitted and the DL signal is not received; The information regarding the at least one first time interval is received by a Downlink Control Information (DCI) or a Medium Access Control-Control Element (MAC-CE); Terminal.

11. the at least one first time interval being one of a plurality of first time intervals that are not available, the information indicating such one; The terminal according to claim 10.

12. the at least one first time interval is at least one symbol indicated as unavailable by a Slot Format Indicator (SFI); The terminal according to claim 10.

13. the at least one second time interval is at least one symbol after a timer corresponding to the at least one first time interval expires. The terminal according to claim 10.

14. The DL signal is received and the UL signal is transmitted in the at least one first time period based on whether the DL signal is a Synchronization Signal Block (SSB) or a Channel State Information-Reference Signal (CSI-RS), or the UL signal is a Physical Random Access Channel (PRACH); The terminal according to claim 10.

15. Based on monitoring a Physical Downlink Control Channel (PDCCH) in the at least one first time interval, a period of a Search Space (SS) set for the at least one first time interval is longer than a period of a Search Space (SS) set for the at least one second time interval; The terminal according to claim 10.

16. The information about the at least one first time period is for informing a pattern consisting of the at least one first time period and the at least one second time period, Information regarding a duration during which the pattern is applied is also received by the DCI or the MAC-CE. The signal transmitting and receiving method according to claim 10.

17. UL transmission or DL ​​reception is performed in a time resource after the end of the period. The signal transmitting and receiving method according to claim 16.

18. After the end of the period, UL transmission or DL ​​reception is performed based on another pattern different from the pattern and the period corresponding to the other pattern. The signal transmitting and receiving method according to claim 16.

19. A method for a base station to receive an uplink (UL) signal or transmit a downlink (DL) signal in a wireless communication system, comprising: Transmitting information regarding at least one time interval that is unavailable; receiving the UL signal or transmitting the DL signal during a time interval other than the at least one time interval; In the at least one time period, the UL signal is not received and the DL signal is not transmitted; The information regarding the at least one time interval is transmitted by a Downlink Control Information (DCI) or a Medium Access Control-Control Element (MAC-CE); Signal transmission and reception methods.

20. A base station for receiving an uplink (UL) signal or transmitting a downlink (DL) signal in a wireless communication system, comprising: At least one transceiver; At least one processor; 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 operations; The operation includes: transmitting, by the at least one transceiver, information regarding at least one unavailable time interval; receiving, by the at least one transceiver, the UL signal or transmitting, by the at least one transceiver, the DL signal during a time interval other than the at least one time interval; In the at least one time period, the UL signal is not received and the DL signal is not transmitted; The information regarding the at least one time interval is transmitted by a Downlink Control Information (DCI) or a Medium Access Control-Control Element (MAC-CE); Base station.

21. A computer-readable storage medium containing at least one computer program causing at least one processor to perform operations, said operations including: receiving information regarding at least one time interval that is unavailable; transmitting the UL signal or receiving the DL signal in a time interval other than the at least one time interval; In the at least one time period, the UL signal is not transmitted and the DL signal is not received; The information regarding the at least one time interval is received by a Downlink Control Information (DCI) or a Medium Access Control-Control Element (MAC-CE); A computer-readable storage medium.

22. An apparatus for transmitting an uplink (UL) signal or receiving a downlink (DL) signal in a wireless communication system, comprising: At least one processor; 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 operations; The operation includes: receiving information regarding at least one time interval that is unavailable; transmitting the UL signal or receiving the DL signal in a time interval other than the at least one time interval; In the at least one time period, the UL signal is not transmitted and the DL signal is not received; The information regarding the at least one time interval is received by a Downlink Control Information (DCI) or a Medium Access Control-Control Element (MAC-CE); Device.

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