Method and apparatus for handling validity of CSI-RS or TRS configuration in a wireless communication system - Patent Application 20070123333

Abstract

A method and apparatus for handling validity of a CSI-RS / TRS configuration in a wireless communication system is provided, the method includes the steps of receiving system information including a CSI-RS and / or TRS configuration, applying the CSI-RS and / or TRS configuration, receiving a system information change indication within a first modification period, considering the CSI-RS and / or TRS configuration to be invalid from a start of a second modification period, and performing synchronization based on at least one SSB.

Description

[Technical field]

[0001] The present disclosure relates to a method and apparatus for handling CSI-RS / TRS configuration availability in a wireless communication system.

[0002] 3GPP (registered trademark) 3rd generation partnership project LTE (long-term evolution) is a technology to enable high-speed packet communication. Many methods have been proposed to achieve the LTE goals of reducing user and operator costs, improving service quality, expanding coverage, and increasing system capacity. 3GPP LTE requires, as upper level requirements, reduced cost per bit, improved service availability, flexible use of frequency bands, simple structure, open interface, and appropriate power consumption of terminals.

[0003] Work has begun at the international telecommunication union (ITU) and 3GPP to develop requirements and specifications for a new radio access technology (NR) system, which may also be called by other names such as new RAT. 3GPP must identify and develop the technical building blocks necessary to successfully standardize NR in a timely manner that meets all immediate market needs and the longer-term requirements set out by the ITU-R (ITU radio communication sector) IMT (international mobile telecommunications)-2020 process. NR must also be able to use any spectrum band reaching at least 100 GHz that can be used for wireless communications into the distant future.

[0004] NR targets a single technology framework that addresses all deployment scenarios, usage scenarios and requirements, including enhanced mobile broadband (eMBB), massive machine-type-communications (mMTC), ultra-reliable and low latency communications (URLLC), etc. NR should be forward compatible in nature. Summary of the Invention [Problem to be solved by the invention]

[0005] If the UE receives a system information change indication within a modification period, the UE shall apply the SI acquisition procedure from the beginning of the next modification period. The UE shall apply the previously acquired system information until it acquires the new system information.

[0006] When the UE wakes up to receive updated system information in the next modified period, the UE can use CSI-RS / TRS for time / frequency synchronization. However, if the system information that causes the SI change instruction is system information including the CSI-RS / TRS configuration, i.e., if the system information including the CSI-RS / TRS configuration is updated, the UE may attempt synchronization using the old CSI-RS / TRS configuration and may not be able to receive the updated system information.

[0007] That is, in NR, synchronization using a Channel State Information Reference Signal (CSI-RS) and / or a Tracking Reference Signal (TRS) is proposed. For example, a specific System Information Block (SIB) includes a CSI-RS / TRS configuration.

[0008] The SI change indication is not for a specific SIB. The SI change indication can inform that any SIB has been changed. In other words, the SI change indication alone does not determine whether a specific SIB, including the CSI-RS / TRS configuration, has been changed.

[0009] When the SI change instruction is for a specific SIB containing the CSI-RS / TRS configuration, and if the CSI-RS / TRS configuration is changed, a synchronization failure may occur since the UE does not know the updated CSI-RS / TRS configuration.

[0010] Therefore, research is needed to address the effectiveness of CSI-RS / TRS configurations in wireless communication systems. [Means for solving the problem]

[0011] In one aspect, a method is provided that is performed by a wireless device in a wireless communication system, the method including receiving system information including a Channel State Information Reference Signal (CSI-RS) and / or a Tracking Reference Signal (TRS) configuration, applying the CSI-RS and / or TRS configuration, receiving a system information change indication within a first modification period, considering the CSI-RS and / or TRS configuration to be invalid from a start of a second modification period, and performing synchronization based on at least one Synchronization Signal and Physical Broadcast CHannel (PBCH) (SSB).

[0012] In another aspect, an apparatus for implementing the method is provided. Effect of the Invention

[0013] The present invention has various advantages.

[0014] According to some embodiments of the present disclosure, a wireless device can efficiently handle the availability of CSI-RS / TRS configurations.

[0015] For example, after receiving a system information change notification, a wireless device may cease using a potentially outdated CSI-RS / TRS configuration, thereby allowing the wireless device to successfully receive updated system information.

[0016] That is, for example, if a system information change notification is received within a modification period, the wireless device may consider the CSI-RS / TRS configuration to be invalid from the start of the next modification period. In this case, the wireless device may not perform synchronization related to the CSI-RS / TRS configuration during the next modified period. Thus, the wireless device may avoid performing synchronization using an old CSI-RS / TRS configuration. Also, resources may be saved by preventing synchronization failures using an old CSI-RS / TRS configuration.

[0017] According to some embodiments of the present disclosure, a wireless communication system can provide an efficient solution for handling CSI-RS / TRS configuration availability.

[0018] The effects obtained by the specific examples of the present specification are not limited to the effects described above. For example, there may be various technical effects that a person having ordinary skill in the related art can understand or derive from the present specification. Thus, the specific effects of the present specification are not limited to those explicitly described in the present specification, but include various effects that can be understood or derive from the technical features of the present specification. [Brief description of the drawings]

[0019] [Figure 1] 1 illustrates an example of a communication system in which the implementations of the present specification may be applied; [Diagram 2] 1 illustrates an example of a wireless device to which the implementations of the present specification may be applied. [Diagram 3]1 illustrates an example of a wireless device to which the implementations of the present specification may be applied. [Figure 4] 4 illustrates another example of a wireless device to which the implementations of this specification may be applied. [Diagram 5] 1 illustrates an example of a UE to which the implementations of this specification may be applied. [Figure 6] 1 illustrates an example of a protocol stack in a 3GPP-based wireless communication system to which the implementation of this specification may be applied. [Figure 7] 1 illustrates an example of a protocol stack in a 3GPP-based wireless communication system to which the implementation of this specification may be applied. [Figure 8] 1 illustrates a frame structure in a 3GPP-based wireless communication system to which the implementation of this specification applies; [Figure 9] 1 shows an example of data flow in a 3GPP NR system to which the present specification is applied. [Figure 10] 1 illustrates an example method for handling CSI-RS / TRS configuration validity in a wireless communication system according to some embodiments of the present disclosure. [Figure 11] 13 shows an example of handling the validity of CSI-RS / TRS configurations. [Figure 12] 13 shows an example of applying the CSI-RS / TRS availability indicators. [Figure 13] FIG. 13 shows an example of a synchronization signal and a PBCH block. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] The following techniques, devices, and systems are applicable to various wireless multiple access systems. Examples of multiple access systems include Code Division Multiple Access (CDMA) systems, Frequency Division Multiple Access (FDMA) systems, Time Division Multiple Access (TDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, and Multi-Carrier Frequency Division Multiple Access (MC-FDMA) systems. CDMA is realized by radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA is realized by radio technologies such as Global System for Mobile communications (GSM), General Packet Radio Service (GPRS), and Enhanced Data rates for GSM Evolution (EDGE). OFDMA is implemented by radio technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (wi-fi), IEEE 802.16 (WiMAX), IEEE 802.20, or E-UTRA (Evolved UTRA). UTRA is part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (Long-Term Evolution) is part of E-UMTS (Evolved UMTS) that uses E-UTRA. 3GPP LTE uses OFDMA on the downlink (DL) and SC-FDMA on the uplink (UL). LTE-A is an evolved version of 3GPP LTE.

[0021] For convenience of explanation, the implementation of the present specification is mainly described in relation to a 3GPP-based wireless communication system. However, the technical characteristics of the present specification are not limited thereto. For example, the following detailed description is provided based on a mobile communication system corresponding to a 3GPP-based wireless communication system, but aspects of the present specification that are not limited to a 3GPP-based wireless communication system can also be applied to other mobile communication systems.

[0022] For terms and techniques used in this specification that are not specifically described, please refer to wireless communication standard documents published prior to this specification.

[0023] In this specification, "A or B" may mean "A only," "B only," or "both A and B." In other words, in this specification, "A or B" may be interpreted as "A and / or B." For example, in this specification, "A, B or C" may mean "A only," "B only," "C only," or "any combination of A, B and C."

[0024] As used herein, a slash ( / ) or a comma may mean "and / or." For example, "A / B" may mean "A and / or B." Thus, "A / B" may mean "A only," "B only," or "both A and B." For example, "A, B, C" may mean "A, B, or C."

[0025] In this specification, "at least one of A and B" may mean "A only," "B only," or "both A and B." In addition, in this specification, the expressions "at least one of A or B" and "at least one of A and / or B" may be interpreted similarly to "at least one of A and B."

[0026] In addition, in this specification, "at least one of A, B and C" may mean "A only," "B only," "C only," or "any combination of A, B and C." It may also mean "at least one of A, B or C" or "at least one of A, B and / or C."

[0027] In addition, parentheses used in this specification may mean "for example." Specifically, when "control information (PDCCH)" is displayed, "PDCCH" may be proposed as an example of "control information." In other words, "control information" in this specification is not limited to "PDCCH," and "PDCCH" may be proposed as an example of "control information." Also, when "control information (i.e., PDCCH)" is displayed, "PDCCH" may be proposed as an example of "control information."

[0028] Technical features described separately in one drawing in this specification may be realized separately or simultaneously.

[0029] Without being limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein may be applicable to various fields where wireless communication and / or connectivity between devices (e.g., 5G) is required.

[0030] Hereinafter, the present specification will be described in more detail with reference to the drawings. In the following drawings and / or description, the same reference numbers may refer to the same or corresponding hardware blocks, software blocks and / or functional blocks, unless otherwise indicated.

[0031] FIG. 1 shows an example of a communication system in which the implementations of the present invention may be applied.

[0032] The 5G usage scenarios shown in FIG. 1 are merely examples, and the technical features of this specification may be applied to other 5G usage scenarios not shown in FIG. 1.

[0033] The three main requirement categories for 5G are (1) enhanced Mobile Broadband (eMBB) category, (2) massive Machine Type Communication (mMTC) category, and (3) Ultra-Reliable and Low Latency Communications (URLLC) category.

[0034] Some use cases may require multiple categories for optimization, others may focus on only one KPI (Key Performance Indicator), 5G will support such a variety of use cases in a flexible and reliable way.

[0035] eMBB goes far beyond basic mobile Internet access and covers a wealth of interactive work and media and entertainment applications in the cloud and augmented reality. Data is one of the core drivers of 5G, and for the first time in the 5G era, dedicated voice services may not be available. In 5G, voice processing is expected to be simplified by applications that utilize the data connection provided by the communication system. The main cause of the increase in traffic is due to the increase in the size of content and the increase in applications that require high data transmission rates. As more devices are connected to the Internet, streaming services (audio and video), interactive video, and mobile Internet connections will be more widely used. Many such applications require an always-on connection to push real-time information and alerts for users. Cloud storage and applications are rapidly increasing on mobile communication platforms and can be applied to both work and entertainment. Cloud storage is a special use case that accelerates the increase in uplink data transmission rates. 5G will also be used for remote work in the cloud. When using haptic interfaces, 5G requires much lower end-to-end latency to maintain a good experience for users. Entertainment, for example cloud gaming and video streaming, is another key factor driving the demand for mobile broadband capabilities. Smartphones and tablets are a must-have for entertainment everywhere, including in highly mobile environments such as trains, carriages and planes. Another use case is augmented reality for entertainment and information retrieval. In this case, augmented reality requires very low latency and instantaneous data volume.

[0036] Also, one of the most promising use cases of 5G is related to its ability to seamlessly connect embedded sensors in all sectors, i.e. mMTC. Potentially, the number of Internet-Of-Things (IoT) devices is expected to reach 240 million by 2020. Industrial IoT is one of the main roles to enable smart cities, asset tracking, smart utilities, agriculture, and security infrastructure through 5G.

[0037] URLLC includes ultra-reliable, low-latency links for new services that will transform industries by remotely controlling main infrastructure and autonomous vehicles. Reliability and latency are essential to control smart grids, automate industries, achieve robotics, and control and coordinate drones.

[0038] 5G is a means of delivering streaming 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 necessary to deliver 4K and higher (6K, 8K and higher) resolution television, as well as virtual and augmented reality. Virtual reality (VR) and augmented reality (AR) applications include highly immersive sports games. Certain applications may require specialized network configurations. For example, for VR games, gaming companies must consolidate their core servers into the network operator's edge network servers to minimize latency.

[0039] Automotive is expected to be a new important motivating force for 5G with many use cases for in-vehicle mobile communications. For example, passenger entertainment demands high concurrent capacity and highly mobile broadband mobile communications, as users continue to expect high quality connectivity regardless of location and speed in the future. Another use case in the automotive field is AR dashboards. AR dashboards allow drivers to identify objects in the dark other than those visible through the windshield and overlap the information transmission to the driver to show the distance to the object and the object's movement. In the future, wireless modules will enable communication between vehicles, information exchange between vehicles and supporting infrastructure, and information exchange between vehicles and other connected devices (e.g. devices accompanying pedestrians). Safety systems will guide drivers through alternative courses of action to drive more safely, reducing the risk of accidents. The next step will be cars that are remotely controlled or driven autonomously. This requires very reliable and very fast communication between different autonomous vehicles and between vehicles and infrastructure. From now on, autonomous vehicles will handle all driving activities, and drivers will only have to focus on abnormal traffic that the vehicle cannot identify. The technical requirements for autonomous vehicles require ultra-low latency and ultra-high reliability to improve road safety to a level that humans cannot achieve.

[0040] Smart cities and smart homes / buildings, also referred to as smart societies, will be embedded with high density wireless sensor networks. A distributed network of intelligent sensors will identify the cost and energy efficient maintenance requirements of the city or house. A similar setup can be done for each home. All temperature sensors, window and heating controllers, burglar alarms, home appliances will be wirelessly connected. A large number of such sensors typically have low data transmission speed, power and cost. However, real-time HD video may be required by certain types of devices for monitoring.

[0041] The higher level of decentralization of energy consumption and distribution, including heat and gas, requires automated control over distribution sensor networks. Smart grids use digital information and communication technologies to collect information, interconnect sensors, and act on the collected information. Because this information includes supplier and consumer actions, smart grids can improve the distribution of fuels, such as electricity, in ways that are more efficient, reliable, economical, productive, sustainable, and automated. Smart grids can also be viewed as another sensor network with low latency.

[0042] Mission-critical applications (e.g., e-health) are one of the 5G usage scenarios. The health sector contains many applications that can benefit from mobile communications. Communication systems can support telemedicine to provide clinical care from afar. Telemedicine reduces the barrier of distance and helps improve access to medical services that are not sustainably available in remote areas. Telemedicine can also be used to provide critical care and save lives in emergency situations. Mobile-based wireless sensor networks can provide remote monitoring and sensing for parameters such as heart rate and blood pressure.

[0043] Wireless and mobile communications are becoming increasingly important in industrial applications. Wiring is expensive to install and maintain. The possibility of replacing cables with reconfigurable wireless links is therefore an attractive opportunity in many industrial sectors. However, to achieve such a replacement, wireless connections must be created with similar latency, reliability and capacity as cables, and the management of wireless connections needs to be simplified. If 5G connections are required, low latency and very low probability of errors are new requirements.

[0044] Logistics and cargo tracking are important use cases for mobile communications using location information systems to enable ubiquitous inventory and package tracking. Logistics and cargo use cases generally require low data rates, but need location information with wide range and reliability.

[0045] 1, a communication system 1 includes wireless devices 100a to 100f, a base station (BS: 200), and a network 300. FIG. 1 illustrates a 5G network as an example of the network of the communication system 1, but the implementation of this specification is not limited to the 5G system and can be applied to future communication systems beyond the 5G system.

[0046] The base station 200 and network 300 may be implemented as wireless devices, where a particular wireless device may act as a base station / network node in conjunction with other wireless devices.

[0047] The wireless devices 100a to 100f are devices that communicate using a radio access technology (RAT) (e.g., 5G NR or LTE), and may also be referred to as communication / wireless / 5G devices. The wireless devices 100a to 100f include, but are not limited to, a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a mobile device 100d, a home appliance 100e, an Internet-Of-Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, the vehicles include vehicles with wireless communication capabilities, autonomous vehicles, and vehicles capable of inter-vehicle communication. The vehicles include unmanned aerial vehicles (UAVs) (e.g., drones). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, and are realized in the form of HMD (Head-Mounted Device) and HUD (Head-Up Display) attached to vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital display boards, vehicles, robots, etc. Portable devices include smartphones, smart pads, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., laptops). Home appliances include televisions, refrigerators, and washing machines. IoT devices include sensors and smart meters.

[0048] In this specification, the wireless devices 100a to 100f may be referred to as User Equipment (UE). The UE includes, for example, a mobile phone, a smartphone, a notebook computer, a digital broadcast terminal, a PDA (Personal Digital Assistant), a PMP (Portable Multimedia Player), a navigation system, a slate PC, a tablet PC, an ultrabook, a vehicle, a vehicle with an automatic driving function, a connected car, a UAV, an AI module, a robot, an AR device, a VR device, an MR device, a hologram device, a public safety device, an MTC device, an IoT device, a medical device, a Fintech device (or a financial device), a security device, a climate / environment device, a device related to 5G services, or a device related to the fourth industrial revolution.

[0049] For example, a UAV may be an aircraft without humans on board that is navigated by radio control signals.

[0050] For example, a VR device includes a device for realizing an object or background of a virtual environment. For example, an AR device includes a device that realizes an object or background of a virtual world by connecting it to an object or background of a real world. For example, an MR device includes a device that realizes an object or background of a virtual world by merging it with an object or background of a real world. For example, a hologram device includes a device that realizes a 360-degree stereoscopic image by recording and reproducing stereoscopic information using the optical interference phenomenon that occurs when two laser lights called a hologram meet.

[0051] For example, public safety devices include image relay devices or image devices that can be worn on the body of a user.

[0052] For example, MTC and IoT devices may be devices that do not require direct human intervention or operation, including, for example, smart meters, vending machines, thermometers, smart light bulbs, door locks, or various sensors.

[0053] For example, a medical device may be a device used for the purposes of diagnosing, treating, mitigating, curing or preventing disease. For example, a medical device may be a device used to diagnose, treat, mitigate or correct an injury or damage. For example, a medical device may be a device used for the purposes of examining, replacing or modifying a structure or function. For example, a medical device may be a device used for fertility control purposes. For example, medical devices include therapeutic devices, driving devices, (in vitro) diagnostic devices, hearing aids or surgical devices.

[0054] For example, a security device may be a device installed to prevent an occurring danger and maintain safety. For example, a security device may be a camera, a closed circuit television (CCTV), a recorder, or a dashcam.

[0055] For example, a fintech device may be a device that can provide financial services such as mobile payments. For example, a fintech device may include a payment device or a POS system.

[0056] For example, climate / environment devices include devices that monitor or predict the climate / environment.

[0057] The wireless devices 100a to 100f can be connected to a network 300 via a base station 200. AI technology is applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f can be connected to an AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, a network after 5G, or the like. The wireless devices 100a to 100f can communicate with each other via the base station 200 / network 300, but can also communicate directly (e.g., sidelink communication) without going through the base station 200 / network 300. For example, the vehicles 100b-1 and 100b-2 can communicate directly (e.g., V2V (Vehicle-to-Vehicle) / V2X (Vehicle-to-everything) communication). Furthermore, an IoT device (eg, a sensor) can directly communicate with other IoT devices (eg, sensors) or other wireless devices 100a to 100f.

[0058] Wireless communication / connections 150a, 150b, 150c may be established between the wireless devices 100a-100f and / or between the wireless devices 100a-100f and the base station 200 and / or between the base stations 200. Here, the wireless communication / connections may be established by various RATs (e.g., 5G NR), such as uplink / downlink communication 150a, sidelink communication 150b (or D2D (Device-To-Device) communication), and inter-base station communication 150c (e.g., relay, IAB (Integrated Access and Backhaul)). The wireless communication / connections 150a, 150b, 150c may allow the wireless devices 100a-100f and the base station 200 to transmit / receive wireless signals to / from each other. For example, the wireless communication / connections 150a, 150b, 150c may transmit / receive signals via various physical channels. To this end, based on various proposals in this specification, at least some of the processes of setting various configuration information for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes are performed.

[0059] Here, the wireless communication technology implemented in the wireless device in the present invention includes not only LTE, NR, and 6G, but also Narrowband Internet of Things (NB-IoT) technology for low power communication. For example, the NB-IoT technology is an example of a low power wide area network (LPWAN) technology and may be implemented in a standard (specification) such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above names. Additionally and / or alternatively, the wireless communication technology implemented in the wireless device in the content of the present disclosure may communicate based on the LTE-M technology. For example, the LTE-M technology is an example of an LPWAN technology and may be called various names such as enhanced machine type communication (eMTC). For example, the LTE-M technology may be implemented in at least one of various standards such as 1) LTE Cat0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the above names. Additionally and / or alternatively, the wireless communication technology implemented in the wireless device in the present disclosure may include at least one of ZigBee (registered trademark), Bluetooth (registered trademark), and / or LPWAN, which consider low-power communication, but are not limited to the above names. For example, ZigBee technology can create a Personal Area Network (PAN) related to small / low-power digital communication based on various specifications such as IEEE802.15.4, and may be called by various names.

[0060] FIG. 2 illustrates an example of a wireless device to which the implementations of this specification may be applied.

[0061] 2, a first radio device 100 and a second radio device 200 can transmit and receive radio signals using various wireless access technologies (e.g., LTE, NR). In Fig. 2, {the first radio device 100 and the second radio device 200} can correspond to at least one of {radio devices 100a-100f and base station 200}, {radio devices 100a-100f and radio devices 100a-100f}, and / or {base station 200 and base station 200} in Fig. 1.

[0062] The first wireless device 100 includes one or more processors 102 and one or more memories 104. The first wireless device 100 may further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 controls the memory 104 and / or the transceiver 106. The processor 102 is configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational 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. In addition, the processor 102 receives a wireless signal including a second information / signal via the transceiver 106, and then processes the second information / signal to store the information obtained in the memory 104. The memory 104 can be connected 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 performing the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Here, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to realize a RAT (e.g., LTE, NR). The transceiver 106 may be connected 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 be mixed with an RF (Radio Frequency) unit. In this specification, the first wireless device 100 may also refer to a communication modem / circuit / chip.

[0063] The second wireless device 200 includes one or more processors 202 and one or more memories 204. The second wireless device 200 may further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 controls the memory 204 and / or the transceiver 206. The processor 202 is configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational 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. In addition, the processor 202 receives a wireless signal including a fourth information / signal via the transceiver 206, and then processes the fourth information / signal to store the information obtained in the memory 204. The memory 204 can be connected 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 performing the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to realize a RAT (e.g., LTE, NR). The transceiver 206 may be connected to the processor 202 and transmits and / or receives radio signals via one or more antennas 208. The transceiver 206 includes a transmitter and / or a receiver. The transceiver 206 may be mixed with an RF unit. In this specification, the second wireless device 200 may also refer to a communication modem / circuit / chip.

[0064] The hardware elements of the wireless device 100, 200 are described in more detail below. One or more protocol layers may be implemented by one or more processors 102, 202, but are not limited thereto. For example, one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as physical (PHY), media access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), radio resource control (RRC), and service data adaptation protocol (SDAP)). One or more processors 102, 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. One or more processors 102, 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. The one or more processors 102, 202 can generate and provide signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information to one or more transceivers 106, 206 according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. The one or more processors 102, 202 can receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and obtain the PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein.

[0065] The one or more processors 102, 202 may be referred to as controllers, microcontrollers, microprocessors, and / or microcomputers. The one or more processors 102, 202 may be implemented using hardware, firmware, software, and / or combinations 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), and / or one or more Field Programmable Gate Arrays (FPGAs). The descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein may be implemented using firmware and / or software, and the firmware and / or software may be configured to include modules, procedures, functions, and / or the like. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein may be included in one or more processors 102, 202 or stored in one or more memories 104, 204 and executed by one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein may be implemented using firmware or software in the form of code, instructions and / or collections of instructions.

[0066] 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, codes, instructions, and / or commands. The one or more memories 104, 204 may be comprised of Read-Only Memory (ROM), Random Access Memory (RAM), Erasable Programmable ROM (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. 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.

[0067] One or more transceivers 106, 206 may transmit user data, control information, wireless signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts, etc., disclosed herein to one or more other devices. One or more transceivers 106, 206 may receive user data, control information, wireless signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts, 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 and may 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, wireless signals / channels, etc., 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, wireless signals / channels, etc., from one or more other devices.

[0068] The one or more transceivers 106, 206 can be coupled to one or more antennas 108, 208. The one or more transceivers 106, 206 are configured to transmit and receive user data, control information, wireless signals / channels, etc., referred to in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts, etc., disclosed herein via the one or more antennas 108, 208.

[0069] The one or more transceivers 106, 206 convert the received user data, control information, radio signals / channels, etc. from RF band signals to baseband signals for processing by 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 by the one or more processors 102, 202 from baseband signals to RF band signals. To that end, the one or more transceivers 106, 206 may include an (analog) oscillator and / or a filter. For example, the one or more transceivers 106, 206 may up-convert an OFDM baseband signal to an OFDM signal by an (analog) oscillator and / or a filter under the control of the one or more processors 102, 202 and transmit the up-converted OFDM signal at a carrier frequency. One or more transceivers 106, 206 receive OFDM signals at a carrier frequency and down-convert the OFDM signals to OFDM baseband signals by means of (analog) oscillators and / or filters under the control of one or more processors 102, 202.

[0070] In the implementation of this specification, the UE operates as a transmitter in the uplink (UL) and as a receiver in the downlink (DL). In the implementation of this specification, the base station operates as a receiver in the UL and as a transmitter in the DL. In the following, for convenience of description, it is mainly assumed that the first wireless device 100 operates as a UE and the second wireless device 200 operates as a base station. For example, a processor 102 connected to, mounted on, or launched in the first wireless device 100 is configured to perform UE operations according to the implementation of this specification or to control the transceiver 106 to perform UE operations according to the implementation of this specification. A processor 202 connected to, mounted on, or launched in the second wireless device 200 is configured to perform base station operations according to the implementation of this specification or to control the transceiver 206 to perform base station operations according to the implementation of this specification.

[0071] In this specification, a base station may be referred to as a Node B, eNode B (eNB), or gNB.

[0072] FIG. 3 illustrates an example of a wireless device to which the implementations of the present disclosure may be applied.

[0073] The wireless device can be realized in different forms depending on the use case / service (see Figure 1).

[0074] Referring to Fig. 3, the wireless devices 100, 200 correspond to the wireless devices 100, 200 of Fig. 2 and are composed of various components, devices / parts and / or modules. For example, each wireless device 100, 200 includes a communication device 110, a control device 120, a memory device 130 and an additional component 140. The communication device 110 includes a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 includes one or more processors 102, 202 of Fig. 2 and / or one or more memories 104, 204 of Fig. 2. For example, the transceiver 114 includes one or more transceivers 106, 206 of Fig. 2 and / or one or more antennas 108, 208 of Fig. 2. The control device 120 is electrically connected to the communication device 110, the memory device 130 and the additional component 140 and controls the overall operation of each wireless device 100, 200. For example, the control device 120 controls the electrical / mechanical operations of each of the wireless devices 100, 200 based on the programs / codes / instructions / information stored in the memory device 130. The control device 120 transmits information stored in the memory device 130 to the outside (e.g., other communication devices) via the communication device 110 through the wireless / wired interface, or stores information received from the outside (e.g., other communication devices) via the communication device 110 through the wireless / wired interface in the memory device 130.

[0075] The additional component 140 may be configured in various ways depending on the type of the wireless device 100, 200. For example, the additional component 140 may include at least one of a power unit / battery, an input / output (I / O) device (e.g., an audio I / O port, a video I / O port), a drive unit, and a computing device. The wireless device 100, 200 may be realized in the form of, but is not limited to, a robot (100a in FIG. 1), a vehicle (100b-1o and 100b-2 in FIG. 1), an XR device (100c in FIG. 1), a mobile device (100d in FIG. 1), a home appliance (100e in FIG. 1), an IoT device (100f in FIG. 1), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a Fintech device (or a financial device), a security device, a climate / environment device, an AI server / device (400 in FIG. 1), a base station (200 in FIG. 1), or a network node. The wireless devices 100, 200 can be mobile or fixed location depending on the use case / service.

[0076] In FIG. 3, the various components, devices / portions and / or modules of the wireless devices 100, 200 are connected to each other via a wired interface or at least some of them are connected wirelessly via the communication device 110. For example, in each of the wireless devices 100, 200, the control device 120 and the communication device 110 are connected by wire, and the control device 120 and the first device (e.g., 130 and 140) are connected wirelessly via the communication device 110. Each of the components, devices / portions and / or modules in the wireless devices 100, 200 may further include one or more elements. For example, the control device 120 is configured by a set of one or more processors. As an example, the control device 120 is configured by a set of a communication control processor, an application processor (AP), an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the memory device 130 is configured by a RAM, a dynamic RAM (DRAM), a ROM, a flash memory, a volatile memory, a non-volatile memory and / or a combination thereof.

[0077] FIG. 4 illustrates another example of a wireless device to which the implementations of this specification may be applied.

[0078] Referring to FIG. 4, a wireless device 100, 200 corresponds to the wireless device 100, 200 of FIG. 2 and is comprised of various components, devices / portions and / or modules.

[0079] The first wireless device 100 includes at least one transceiver, such as transceiver 106, and at least one processing chip, such as processing chip 101. The processing chip 101 includes at least one processor, such as processor 102, and at least one memory, such as memory 104. The memory 104 is operatively connected to the processor 102. The memory 104 stores various types of information and / or instructions. The memory 104 stores software code 105 that, when executed by the processor 102, implements instructions to perform the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. For example, the software code 105, when executed by the processor 102, implements instructions to perform the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. For example, the software code 105 controls the processor 102 to perform one or more protocols. For example, the software code 105 controls the processor 102 to perform one or more air interface protocol layers.

[0080] The second wireless device 200 includes at least one transceiver, such as transceiver 206, and at least one processing chip, such as processing chip 201. The processing chip 201 includes at least one processor, such as processor 202, and at least one memory, such as memory 204. The memory 204 is operatively coupled to the processor 202. The memory 204 stores various types of information and / or instructions. The memory 204 stores software code 205 that, when executed by the processor 202, implements instructions to perform the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. For example, the software code 205, when executed by the processor 202, implements instructions to perform the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. For example, the software code 205 controls the processor 202 to perform one or more protocols. For example, the software code 205 controls the processor 202 to perform one or more air interface protocol layers.

[0081] FIG. 5 illustrates an example of a UE to which the implementations of the present specification may be applied.

[0082] Referring to FIG. 5, a UE 100 corresponds to the first radio device 100 of FIG. 2 and / or the first radio device 100 of FIG.

[0083] The UE 100 includes a processor 102, a memory 104, a transceiver 106, one or more antennas 108, a power management module 110, a battery 112, a display 114, a keypad 116, a Subscriber Identification Module (SIM) card 118, a speaker 120, and a microphone 122.

[0084] The processor 102 is configured to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. The processor 102 is configured to control one or more other components of the UE 100 to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. The air interface protocol layer can be implemented in the processor 102. The processor 102 includes an ASIC, other chipset, logic circuit, and / or data processing device. The processor 102 can be an application processor. The processor 102 includes at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulator and demodulator). Examples of processor 102 can be found in the SNAPDRAGON™ series processors manufactured by Qualcomm®, the EXYNOS™ series processors manufactured by Samsung®, the A-series processors manufactured by Apple®, the HELLIO™ series processors manufactured by MediaTek®, the ATOM™ series processors manufactured by Intel®, or corresponding next generation processors.

[0085] The memory 104 is operatively coupled to the processor 102 and stores various information for operating the processor 102. The memory 104 may include a ROM, a RAM, a flash memory, a memory card, a storage medium, and / or other storage devices. When an embodiment is implemented in software, the techniques described herein may be implemented using modules (e.g., procedures, functions, etc.) that perform the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. The modules are stored in the memory 104 and executed by the processor 102. The memory 104 may be implemented within the processor 102 or external to the processor 102, in which case it may be communicatively coupled to the processor 102 by various methods known in the art.

[0086] The transceiver 106 is operatively coupled to the processor 102 to transmit and / or receive wireless signals. The transceiver 106 includes a transmitter and a receiver. The transceiver 106 includes baseband circuitry for processing radio frequency signals. The transceiver 106 controls one or more antennas 108 to transmit and / or receive wireless signals.

[0087] The power management module 110 manages the power supply for the processor 102 and / or the transceiver 106. A battery 112 provides power to the power management module 110.

[0088] The display 114 outputs the results processed by the processor 102. The keypad 116 receives inputs used by the processor 102. The keypad 116 may be displayed on the display 114.

[0089] SIM card 118 is an integrated circuit for securely storing an International Mobile Subscriber Identity (IMSI) and associated keys that are used to identify and authenticate a subscriber to a mobile device such as a cell phone or computer. Many SIM cards can also store contact information.

[0090] A speaker 120 outputs sound-related results processed by the processor 102. A microphone 122 receives sound-related input for use by the processor 102.

[0091] 6 and 7 show examples of protocol stacks in a 3GPP-based wireless communication system to which the implementation of this specification may be applied.

[0092] In particular, FIG. 6 illustrates an example of a radio interface user plane protocol stack between a UE and a BS, and FIG. 7 illustrates an example of a radio interface control plane protocol stack between a UE and a BS. The control plane refers to a path along which control messages used by a UE and a network to manage a call are transmitted. The user plane refers to a path along which data generated in an application layer, for example, voice data or Internet packet data, is transmitted. Referring to FIG. 6, the user plane protocol stack is divided into a first layer (i.e., a PHY layer) and a second layer. Referring to FIG. 7, the control plane protocol stack is divided into a first layer (i.e., a PHY layer), a second layer, a third layer (e.g., an RRC layer), and a non-access stratum (NAS) layer. The first layer, the second layer, and the third layer are referred to as an access stratum (AS).

[0093] In a 3GPP LTE system, layer 2 is divided into MAC, RLC, and PDCP sublayers. In a 3GPP NR system, layer 2 is divided into MAC, RLC, PDCP, and SDAP sublayers. The PHY layer provides transmission channels to the MAC sublayer, which provides logical channels to the RLC sublayer, which provides RLC channels to the PDCP sublayer, and which provides radio bearers to the SDAP sublayer. The SDAP sublayer provides Quality of Service (QoS) flows to the 5G core network.

[0094] The main services and functions of the MAC sublayer in a 3GPP NR system include: mapping between logical channels and transmission channels; multiplexing / demultiplexing MAC SDUs belonging to one or other logical channels to / from a transmission block (TB) conveyed to / from the physical layer on a transmission channel; scheduling information reporting; error correction by Hybrid Automatic Repeat Request (HARQ) (one HARQ entity per cell in case of carrier aggregation (CA)); priority handling between UEs by dynamic scheduling; priority handling between logical channels of one UE by logical channel prioritization; and padding. A single MAC entity can support multiple numerologies, transmission timings and cells. The mapping restrictions of the logical channel prioritization control which numerologies, cells and transmission timings a logical channel can use.

[0095] The MAC provides various types of data transmission services. To accommodate other types of data transmission services, various types of logical channels are defined. That is, each logical channel supports a specific type of information transmission. Each logical channel type is defined according to the information type to be transmitted. The logical channels are classified into two groups: control channels and traffic channels. The control channels are used only for transmitting control plane information, and the traffic channels are used only for transmitting user plane information. The Broadcast Control Channel (BCCH) is a downlink logical channel for broadcasting system control information. The Paging Control Channel (PCCH) is a downlink logical channel for transmitting paging information, system information change notifications, and indications of ongoing Public Warning Service (PWS) broadcasts. The Common Control Channel (CCCH) is a logical channel for transmitting control information between the UE and the network and is used for UEs that do not have an RRC connection with the network. The Dedicated Control Channel (DCCH) is a point-to-point bidirectional logical channel for transmitting dedicated control information between the UE and the network and is used by UEs that have an RRC connection. A Dedicated Traffic Channel (DTCH) is a point-to-point logical channel that is dedicated to one UE for user information transmission. A DTCH may exist in both uplink and downlink. In the downlink, the following connections exist between logical channels and transmission channels: BCCH may be mapped to a Broadcast Channel (BCH), BCCH may be mapped to a Downlink Shared Channel (DL-SCH), PCCH may be mapped to a Paging Channel (PCH), CCCH may be mapped to a DL-SCH, DCCH may be mapped to a DL-SCH, and DTCH may be mapped to a DL-SCH. In the uplink, the following connections exist between logical channels and transmission channels:The CCCH may be mapped to an Uplink Shared Channel (UL-SCH), the DCCH may be mapped to the UL-SCH, and the DTCH may be mapped to the UL-SCH.

[0096] The RLC sublayer supports three transmission modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). RLC configuration is performed by logical channel, independent of numerology and / or transmission period. In the 3GPP NR system, the main services and functions of the RLC sublayer vary depending on the transmission mode and include: transmission of higher layer PDUs; sequence number assignment independent of that in PDCP (UM and AM); error correction by ARQ (AM only); segmentation of RLC SDUs (AM and UM) and resegmentation (AM only); reassembly of SDUs (AM and UM); duplicate detection (AM only); RLC SDU discard (AM and UM); RLC re-establishment; protocol error detection (AM only).

[0097] In a 3GPP NR system, the main services and functions of the PDCA sublayer for the user plane include: sequence numbering; header compression and decompression using Robust Header Compression (ROHC); user data transmission; reordering and duplicate detection; in-order delivery; PDCP PDU routing (for split bearers); PDCP SDU retransmission; ciphering; deciphering and integrity protection; PDCP SUD discard; PDCP re-establishment and data recovery for RLC AM; PDCP status reporting for RLC AM; PDCP PDU duplication and duplicate discard indication to lower layers. The main services and functions of the PDCP sublayer for the control plane include: sequence numbering; ciphering; deciphering and integrity protection; control plane data transmission; reordering and duplicate detection; in-order delivery; PDCP PDU duplication and duplicate discard indication to lower layers.

[0098] The main services and functions of the SDAP in the 3GPP NR system include: mapping between QoS flows and data radio bearers; indication of QoS Flow ID (QFI) in both DL and UL packets. A single protocol entity of the SDAP is configured for each individual PDU session.

[0099] In the 3GPP NR system, the main services and functions of the RRC sublayer include: broadcasting of system information related to the AS and NAS; paging initiated by 5GC or NG-RAN; establishment, maintenance and release of an RRC connection between the UE and the NG-RAN; security functions including key management; establishment, configuration, maintenance and release of signaling radio bearers (SRBs) and data radio bearers (DRBs); mobility functions (including handover and context transfer, UE cell selection and reselection and control of cell selection and reselection, inter-RAT mobility); QoS management functions; UE measurement reporting and reporting control; radio link failure detection and recovery; and NAS message transmission from / to the UE to / from the NAS.

[0100] FIG. 8 illustrates a frame structure in a 3GPP-based wireless communication system in which the implementation of this specification is applied.

[0101] The frame structure shown in FIG. 8 is merely an example, and the number of subframes, the number of slots, and / or the number of symbols in a frame may be variously changed. In a 3GPP-based wireless communication system, OFDM numerology (e.g., Sub-Carrier Spacing (SCS), Transmission Time Interval (TTI) duration) may be set differently between multiple cells aggregated for one UE. For example, when a UE is configured with different SCSs for the aggregated cells, the (absolute time) duration of time resources (e.g., subframes, slots, or TTIs) including the same number of symbols may be different between the aggregated cells. Here, the symbols include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or DFT-s-OFDM (Discrete Fourier Transform-Spread-OFDM) symbols.

[0102] Referring to FIG. 8, downlink and uplink transmissions are composed of frames. Each frame has a duration of Tf=10 ms. Each frame is divided into two half-frames, each of which has a duration of 5 ms. Each half-frame is composed of five subframes, each of which has a duration Tsf of 1 ms. Each subframe is divided into slots, and the number of slots in a subframe varies depending on the subcarrier spacing. Each slot contains 14 or 12 OFDM symbols based on the CP (Cyclic Prefix). In the general CP, each slot contains 14 OFDM symbols, and in the extended CP, each slot contains 12 OFDM symbols. The numerology is based on the exponentially expandable subcarrier spacing Δf=2u*15kHz.

[0103] Table 1 shows the number of OFDM symbols per slot Nslotsymb, the number of slots per frame Nframe,uslot, and the number of slots per subframe Nsubframe,uslot for the general CP according to a subcarrier spacing Δf=2u*15kHz.

[0104] [Table 1]

[0105] Table 2 shows the number of OFDM symbols per slot, Nslotsymb, the number of slots per frame, Nframe,uslot, and the number of slots per subframe, Nsubframe,uslot, for extended CP according to subcarrier spacing Δf=2u*15kHz.

[0106] [Table 2]

[0107] A slot includes multiple symbols (e.g., 14 or 12 symbols) in the time domain. For each numerology (e.g., subcarrier spacing) and carrier, a Nsize,ugrid,x*NRBsc subcarriers and Nsubframe,usymb OFDM symbol resource grid is defined starting from a common resource block (CRB) Nstart,ugrid indicated by higher layer signaling (e.g., RRC signaling). Here, Nsize,ugrid,x is the number of resource blocks (RBs) in the resource grid, with the subscript x being DL for downlink and UL for uplink. NRBsc is the number of subcarriers per RB. In 3GPP-based wireless communication systems, NRBsc is typically 12. There is one resource grid for a given antenna port p, subcarrier spacing setting u and transmission direction (DL or UL). The carrier bandwidth Nsize,ugrid for subcarrier spacing setting u is given by higher layer parameters (e.g., RRC parameters). Each element of the resource grid for antenna port p and subcarrier spacing setting u is called a resource element (RE), and one complex symbol is mapped to each RE. Each RE of the resource grid is uniquely identified by index k in the frequency domain and index l indicating the symbol position relative to a reference point in the time domain. In 3GPP-based wireless communication systems, an RB is defined as 12 consecutive subcarriers in the frequency domain.

[0108] In a 3GPP NR system, RBs are divided into CRBs and PRBs (Physical Resource Blocks). CRBs are numbered in the frequency domain, starting from 0 and increasing in number, for a subcarrier spacing setting u. The center of subcarrier 0 of CRB0 for a subcarrier spacing setting u coincides with "point A", which serves as a common reference point for the resource block grid. In a 3GPP NR system, PRBs are defined within a BandWidth Part (BWP) and numbered from 0 to NsizeBWP,i-1, where "i" is the BWP number. The relationship between PRB nPRB and CRB nCRB ​​of BWPi is as follows: nPRB=nCRB+NsizeBWP,i, where NsizeBWP,i is the CRB where the BWP starts with respect to CRB0. A BWP includes multiple consecutive RBs. A carrier includes up to N (e.g., 5) BWPs. A UE can be configured with one or more BWPs on a given component carrier. Only one BWP configured in a UE can be active at a time. The active BWP defines the operating bandwidth of the UE within the operating bandwidth of the cell.

[0109] The NR frequency band is defined as two types of frequency ranges (FR1, FR2). The values ​​of the frequency ranges can be changed. For example, the two types of frequency ranges (FR1, FR2) are as shown in Table 3 below. For convenience of explanation, FR1 of the frequency ranges used in the NR system means "sub 6GHz range" and FR2 means "above 6GHz range" and is called Millimeter Wave (mmW).

[0110] [Table 3]

[0111] As mentioned above, the numerical values ​​of the frequency range of the NR system can be changed. For example, FR1 includes the band from 410 MHz to 7125 MHz as shown in Table 4 below. That is, FR1 includes the frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.). For example, the frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.) included in FR1 include unlicensed bands. Unlicensed bands can be used for various purposes, such as communication for vehicles (e.g., autonomous driving).

[0112] [Table 4]

[0113] In this disclosure, the term "cell" may refer to a geographical area in which one or more nodes provide a communication system, or may refer to a radio resource. A "cell" as a geographical area may be understood as a coverage in which a node can provide a service using a carrier, and a "cell" as a radio resource (e.g., time-frequency resource) is associated with a bandwidth, which is a frequency range set by the carrier. A "cell" in relation to radio resources is defined as a combination of downlink and uplink resources, e.g., a combination of a DL CC (Component Carrier) and a UL CC. A cell may be composed of only downlink resources, or may be composed of downlink and uplink resources. Since DL coverage, which is the range in which a node can transmit a valid signal, and UL coverage, which is the range in which a node can receive a valid signal from a UE, depend on the carrier carrying the signal, the coverage of a node is related to the coverage of a "cell" of radio resources used by the node. Thus, the term "cell" is sometimes used to indicate the service coverage of a node, and other times to indicate a radio resource, and other times to indicate the range in which a signal using the radio resource can reach with valid strength.

[0114] In CA, two or more CCs are aggregated. A UE can receive or transmit simultaneously on one or more CCs depending on its capabilities. CA is supported for both contiguous and non-contiguous CCs. When CA is configured, the UE has only one RRC connection with the network. One serving cell provides NAS mobility information during RRC connection establishment / re-establishment / handover, and one serving cell provides security input during RRC connection re-establishment / handover. This cell is called a Primary Cell (PCell). A PCell is a cell operating on a primary frequency where a UE performs an initial connection establishment procedure or initiates a connection re-establishment procedure. Depending on the UE capabilities, a Secondary Cell (SCell) can be configured to form a set of serving cells together with the PCell. A SCell is a cell that provides additional radio resources on top of a Special Cell (SpCell). Thus, a set of serving cells configured for a UE always consists of one PCell and one or more SCells. In case of dual connectivity (DC) operation, the term SpCell refers to the PCell of a Master Cell Group (MCG) or the Primary SCell (PSCell) of a Secondary Cell Group (SCG). The SpCell supports PUCCH transmission and contention-based optional access and is always activated. The MCG is a group of serving cells associated with a master node consisting of an SpCell (PCell) and optionally one or more SCells. The SCG is a group of serving cells associated with a secondary node consisting of a PSCell and zero or more SCells for a UE consisting of a DC. For a UE in RRC_CONNECTED that is not configured in CA / DC, there is only one serving cell consisting of a PCell. For an RRC_CONNECTED UE configured in CA / DC, the term "serving cell" is used to denote the cell set consisting of the SpCell(s) and all SCells. One MAC entity is configured for the UE in DC.One is for the MCG and the other is for the SCG.

[0115] FIG. 9 illustrates an example of data flow in a 3GPP NR system to which the implementations of this specification may be applied.

[0116] Referring to Figure 9, "RB" indicates a radio bearer and "H" indicates a header. Radio bearers are classified into two groups: DRB for user plane data and SRB for control plane data. MAC PDUs are transmitted and received from external devices via the PHY layer using radio resources. MAC PDUs arrive at the PHY layer in the form of a transmission block.

[0117] In the PHY layer, the uplink transmission channels UL-SCH and RACH (Random Access Channel) are respectively mapped to the physical channels PUSCH (Physical Uplink Shared Channel) and PRACH (Physical Random Access Channel), and the downlink transmission channels DL-SCH, BCH and PCH are respectively mapped to PDSCH (Physical Downlink Shared Channel), PBCH (Physical Broadcast Channel) and PDSCH. In the PHY layer, the uplink control information (UCI) is mapped to the PUCCH (Physical Uplink Control Channel), and the downlink control information (DCI) is mapped to the PDCCH (Physical Downlink Control Channel). The MAC PDUs related to the UL-SCH are transmitted by the UE via the PUSCH based on the UL grant, and the MAC PDUs related to the DL-SCH are transmitted by the BS via the PDSCH based on the DL allocation.

[0118] The following describes the technical features related to SI change indication and PWS notification, see 5.2.2.2.2 of 3GPP TS 38.331 v16.6.0.

[0119] A modification period is used, i.e. updated SI messages (except SI messages for ETWS, CMAS and positioning support data) are broadcast in the modification period following the modification period in which the SI change indication was sent. The modification period boundary is defined as the SFN value, SFN mod m=0, where m is the number of radio frames that make up the modification period. The modification period is configured according to the system information. The UE receives an indication for SI modification and / or a PWS notification using a short message sent over DCI with the P-RNTI. The SI change indication can be repeated within a previous modification period. The SI change indication does not apply to SI messages containing posSIB.

[0120] A UE in RRC_IDLE or RRC_INACTIVE shall monitor the SI change indication at its own paging occasion every DRX period. A UE in RRC_CONNECTED shall monitor the SI change indication at least once per modification period at every paging occasion if a common search space including pagingSearchSpace, searchSpaceSIB1 and searchSpaceOtherSystemInformation is provided to the UE in an active BWP for paging monitoring.

[0121] During a modification period in which an ETWS or CMAS transmission is started or stopped, the SI message carrying the pos SIB reserved in the posSchedulingInfoList may be changed, and therefore the UE may not be able to receive the corresponding pos SIB normally for the remainder of the current modification period and the next modification period, depending on the scheduling information received before the change.

[0122] An ETWS or CMAS capable UE in RRC_IDLE or RRC_INACTIVE shall monitor an indication for a PWS notification at its own paging occasion every DRX cycle. An ETWS or CMAS capable UE in RRC_CONNECTED shall monitor an indication for a PWS notification at least once every defaultPagingCycle in all paging situations if a common search space including pagingSearchSpace, searchSpaceSIB1 and search SpaceOtherSystemInformation is provided to the UE in an active BWP for paging monitoring.

[0123] In order to receive a short message in a paging situation, the UE monitors the PDCCH monitoring situation(s) for paging.

[0124] When the UE receives a short message, the UE shall do the following:

[0125] If the UE is ETWS-capable or CMAS-capable and the etwsAndCmasIndication bit in the short message is set, and the UE is provided with search Space SIB1 and searchSpaceOtherSystemInformation for an active BWP or initial BWP:

[0126] Reacquire immediate SIB1;

[0127] If the UE is ETWS capable and si-SchedulingInfo contains scheduling information for SIB6:

[0128] Get SIB6 immediately;

[0129] 2> If the UE is ETWS capable and si-SchedulingInfo contains scheduling information for SIB7:

[0130] 3>Get SIB7 immediately;

[0131] 2> If the UE is CMAS capable and si-SchedulingInfo contains scheduling information for SIB8:

[0132] 3>Get SIB8 immediately;

[0133] If SIB6, SIB7 or SIB8 overlaps with a measurement gap, the manner in which SIB6, SIB7 or SIB8 is immediately acquired depends on the UE implementation.

[0134] If the systemInfoModification bit of the short message is set:

[0135] The SI acquisition procedure is applied from the beginning of the next correction period.

[0136] The technical features related to system information acquisition are described below, see 5.2.2.3 of 3GPP TS 38.331 v16.6.0.

[0137] MIB and SIB1 acquisition

[0138] The UE needs to do the following:

[0139] Apply the specified BCCH configuration;

[0140] If the UE is in RRC_IDLE or RRC_INACTIVE; or

[0141] If the UE is in RRC_CONNECTED state while T311 is running:

[0142] Obtain scheduled MIB;

[0143] If the UE cannot acquire the MIB;

[0144] perform the work;

[0145] If not:

[0146] Perform the work.

[0147] The UE is in RRC_CONNECTED with an active BWP with a common search space configured by searchSpaceSIB1 and pagingSearchSpace and has received an indication for a system information change; or

[0148] If the UE is in RRC_CONNECTED with an active BWP with a common search space configured by searchSpaceSIB1, and the UE does not store a valid version of one or more mandatory SIBs or posSIBs, and the UE does not acquire SIB1 in the current modification period; or

[0149] If the UE is in RRC_CONNECTED with an active BWP with a common search space configured by searchSpaceSIB1, and if the UE does not store a valid version of one or more mandatory SIBs or pos SIBs, then the si-BroadcastStatus for the mandatory SIB(s) or the posSI-BroadcastStatus for the mandatory posSIB(s) is set to not broadcasting in SIB1 acquired in the current modification period; or

[0150] If the UE is in RRC_IDLE or RRC_INACTIVE; or

[0151] If the UE is in RRC_CONNECTED state while T311 is running:

[0152] If ssb-SubcarrierOffset indicates that SIB1 was transmitted in the cell and SIB1 acquisition is required for the UE:

[0153] Obtain scheduled SIB1;

[0154] If the UE cannot acquire SIB1:

[0155] Perform actions related to missing essential system information;

[0156] Additionally:

[0157] When SIB1 is acquired, when SIB1 is received, perform work;

[0158] Otherwise, if SIB1 acquisition is required for the UE and ssb-SubcarrierOffset indicates that SIB1 was not scheduled in the cell:

[0159] Perform tasks related to missing essential system information.

[0160] A UE in RRC_CONNECTED state needs to acquire the broadcasted SIB1 only if the UE is unable to acquire the broadcasted SIB1 without disturbing unicast data reception, i.e., in the same position given by the broadcast and unicast beams.

[0161] SI message acquisition

[0162] The PDCCH monitoring time for acquiring SI messages is determined according to searchSpaceOtherSystemInformation. If search Space Other System Information is set to 0, the PDCCH monitoring time for receiving SI messages in the SI-window is the same as the PDCCH monitoring time for SIB1, whose mapping between the PDCCH monitoring time and SSBs is specified in TS38.213

[13] . If searchSpaceOtherSystemInformation is not set to 0, the PDCCH monitoring time for SI messages is determined based on the search space indicated by searchSpaceOtherSystemInformation. The PDCCH monitoring times for SI messages that do not overlap with UL symbols (determined according to tdd-UL-DL-ConfigurationCommon) are numbered sequentially starting from 1 in the SI window. The [x×N+K]th PDCCH monitoring instance(s) for an SI message in the SI-window corresponds to the Kth transmitted SSB, where x=0,1,...X-1,K=1,2,...N, where N is the number of actually transmitted SSBs determined according to ssb-PositionsInBurst in SIB1, and X is equal to CEIL (the number of PDCCH monitoring instances in the SI-window / N). The actually transmitted SSBs are numbered sequentially starting from 1 in ascending order of SSB index. The UE assumes that a PDCCH for the SI message was transmitted at at least one PDCCH monitoring instance corresponding to each SSB transmitted in the SI window, and therefore the selection of an SSB for a received SI message is up to the UE implementation.

[0163] When acquiring an SI message, the UE needs to do the following:

[0164] Determine the start of the SI window for the associated SI message as follows:

[0165] If the SI message is configured in the SchedulingInfoList:

[0166] For the corresponding SI message, determine the number n that corresponds to the item order of the SI message list configured by SchedulingInfoList in si-SchedulingInfo of SIB1;

[0167] Determine the integer value x=(n-1)×w, where w is the si-WindowLength.

[0168] The SI-window starts at slot #a (a=x mod N) of the radio frame with SFN mod T=FLOOR(x / N), where T is the si-period of the associated SI message and N is the number of slots in the radio frame.

[0169] Otherwise, if the SI message is configured in the posSchedulingInfo List and offsetToSI-Used is not configured:

[0170] A connected SI message list is generated by adding the posSchedulingInfoList in posSI-SchedulingInfo of SIB1 to the Scheduling InfoList in si-SchedulingInfo of SIB1.

[0171] A number n corresponding to the order of items in the connected list for the corresponding SI message is determined.

[0172] Determine the integer value x=(n-1)×w, where w is the si-WindowLength.

[0173] The SI-window starts at slot #a, where a=x mod N, in a radio frame, where SFN mod T=FLOOR(x / N), where T is the probability period of the SI message and N is the number of slots in the radio frame.

[0174] Otherwise, if the SI message is configured with the posSchedulingInfo List and offsetToSI-Used is configured:

[0175] Determine a number m that corresponds to the number of SI messages with an si-period associated with 8 radio frames (80 ms) configured by the SchedulingInfoList of SIB1;

[0176] Determine the number n corresponding to the item order of the SI message list configured by the posScheduling Info List of SIB1 for the corresponding SI message;

[0177] 3> Determine the integer value x=m×w+(n-1)×w, where w is the si-WindowLength;

[0178] 3> The SI-window starts from slot #a, where a=x mod N, in the radio frame, where SFN mod T=FLOOR(x / N)+8, where T is the possible period of the corresponding SI message and N is the number of slots in the radio frame;

[0179] receive a PDCCH containing a scheduling RNTI (i.e., the SI-RNTI of the PDCCH monitoring opportunity(s) for acquiring an SI message) from the start of the SI-window and continues until the end of the SI-window, the absolute length of time of which is given by si-WindowLength, or until an SI message is received;

[0180] If an SI message cannot be received until the SI-window ends, the reception will be repeated at the next SI-window opportunity for the corresponding SI message within the current revision period;

[0181] The UE does not need to interfere with unicast data reception and only needs to acquire the broadcasted SI messages if the UE is unable to acquire the broadcasted SI messages, i.e., in the same location given the broadcast and unicast beams.

[0182] The UE does not need to monitor the PDCCH monitoring opportunity(s) corresponding to each SSB transmitted in the SI-window.

[0183] If the corresponding SI message is not received within the current modification period, the UE implementation is responsible for the SI message acquisition process.

[0184] If a UE in RRC_CONNECTED state acquires the requested SIB(s), it can suspend PDCCH monitoring for the SI window for the corresponding SI message.

[0185] If SIB12 of the current serving cell (in the case of RRC_INACTIVE or RRC_IDLE) or the current PCell (in the case of RRC_CONNECTED) does not provide a configuration for NR sidelink communication for the corresponding frequency, and if another cell that provides a configuration for NR sidelink communication for the corresponding frequency satisfies the criterion S, a UE that is capable of NR sidelink communication and has been configured by higher layers to perform NR sidelink communication on the frequency can acquire SIB12 from a cell other than the current serving cell (in the case of RRC_INACTIVE or RRC_IDLE) or the current PCell (in the case of RRC_CONNECTED).

[0186] Executes the operation on the acquired SI message.

[0187] The following describes the technical features related to CSI-RS / TRS.

[0188] In LTE, synchronization signals (i.e., PSS / SSS) are transmitted every 10 ms and CRS is transmitted in almost every subframe, so that a UE can use the synchronization signals or CRS to perform time / frequency synchronization, tracking or measurement.

[0189] However, in NR, SSBs including the measurement SSS are transmitted every 20 ms and there is no Always On reference signal like the LTE CRS, so unnecessary wake-ups occur frequently and time / frequency tracking performance may be degraded compared to LTE.

[0190] The CSI-RS is a reference signal that can be used for CSI estimation, beam management or time-frequency tracking, while the TRS is a reference signal that can be used to estimate the delay spread and Doppler spread and improve the time / frequency tracking performance.

[0191] For UEs in RRC_CONNECTED state, the CSI-RS / TRS configuration is transmitted via dedicated RRC signaling (e.g., RRC reconfiguration).

[0192] For UEs in RRC_IDLE / INACTIVE state, the CSI-RS / TRS configuration is transmitted via system information.

[0193] If a UE in RRC_IDLE / INACIVE receives a CSI-RS / TRS configuration via system information, the UE assumes that it cannot use CSI-RS / TRS until an availability indication for CSI-RS / TRS is displayed in the system information.

[0194] The availability indication for CSI-RS / TRS indicates which CSI-RS / TRS are available for use.

[0195] The CSI-RS / TRS availability indicator indicates the period during which it is available for use.

[0196] The UE considers the CSI-RS / TRS to be available during the available period.

[0197] The availability indication is transmitted via the PEI or the paging DCI.

[0198] The r(m) for CSI-RS is:

[0199] JPEG2025506091000006.jpg1580

[0200] Here, a pseudorandom sequence c(i) is defined. The pseudorandom sequence generator needs to be initialized as follows:

[0201] JPEG2025506091000007.jpg11100

[0202] n μ s、f is the slot number in the radio frame, l is the OFDM symbol number in the slot, and n ID is provided by higher layer parameters.

[0203] For each configured CSI-RS, the UE receives resource element (k, l). p、μ We need to assume a sequence r(m) that maps to resource element (k, l). p、μ is within the resource block occupied by the CSI-RS resources for which the UE is configured. The time domain location of the CSI-RS is given by a bitmap provided by higher layer parameters (such as "firstOFDMSymbolInTimeDomain" in the IE below) and the frequency domain location of the CSI-RS is given by a bitmap provided by higher layer parameters (such as "Frequency Domain Allocation" in the IE below).

[0204] The following "IECSI-RS-ResourceMapping" is used to configure the resource element mapping of CSI-RS resources in the time and frequency domain.

[0205] Table 5 shows an example of the CSI-RS-ResourceMapping information element.

[0206]

Table 5

[0207] <CSI-RS Resource Mapping Field Description>

[0208] "cdm-Type": It is the CDM type.

[0209] "density": It is the density of the CSI-RS resource measured in RE / port / PRB.

[0210] "freqBand": Wideband or partial-band CSI-RS

[0211] "firstOFDMSymbolInTimeDomain": Time-domain allocation within a physical resource block. The field indicates the first OFDM symbol of the PRB used for CSI-RS.

[0212] "FrequencyDomainAllocation": Frequency-domain allocation within a physical resource block. The applicable row numbers are determined by the frequency-domain allocation for rows 1, 2, 4, and for other rows, the values in the port, density, and CDMtype columns are determined to match the following nrofPorts, cdm-Type, and density values.

[0213] "nrofPorts": The number of ports.

[0214] The UE is expected to receive CSI-RS and DM-RS in the same resource element.

[0215] For channel state estimation purposes, the UE is configured to measure CSI-RS and estimate the downlink channel state based on the CSI-RS measurement. The UE feeds back the estimated channel state to the gNB again for use in link adaptation.

[0216] On the other hand, if the UE receives a system information change indication within a modification period, the UE shall apply the SI acquisition procedure from the beginning of the next modification period. The UE shall apply the previously acquired system information until it acquires the new system information.

[0217] When the UE wakes up to receive updated system information in the next modified period, the UE can use CSI-RS / TRS for time / frequency synchronization. However, if the system information that causes the SI change instruction is system information including the CSI-RS / TRS configuration, i.e., if the system information including the CSI-RS / TRS configuration is updated, the UE may attempt synchronization using the old CSI-RS / TRS configuration and may not be able to receive the updated system information.

[0218] That is, in NR, synchronization using a Channel State Information Reference Signal (CSI-RS) and / or a Tracking Reference Signal (TRS) is proposed. For example, a specific System Information Block (SIB) includes a CSI-RS / TRS configuration.

[0219] The SI change indication is not for a specific SIB. The SI change indication can inform that any SIB has been changed. In other words, the SI change indication alone does not determine whether a specific SIB, including the CSI-RS / TRS configuration, has been changed.

[0220] When the SI change instruction is for a specific SIB containing the CSI-RS / TRS configuration, and if the CSI-RS / TRS configuration is changed, a synchronization failure may occur since the UE does not know the updated CSI-RS / TRS configuration.

[0221] Therefore, research is needed to address the effectiveness of CSI-RS / TRS configurations in wireless communication systems.

[0222] Hereinafter, a method for handling the availability of a CSI-RS / TRS configuration in a wireless communication system according to some embodiments of the present invention will be described with reference to the following drawings.

[0223] The following drawings are created to explain specific embodiments of the present invention. The names of specific devices and names of specific signals / messages / fields shown in the drawings are for illustrative purposes only, and the technical ideas of the present invention are not limited to the specific names used in the following drawings. Hereinafter, the wireless devices can be referred to as UE (User Equipment).

[0224] FIG. 10 illustrates an example method for handling CSI-RS / TRS configuration validity in a wireless communication system in accordance with some embodiments of the present disclosure.

[0225] In particular, FIG. 10 illustrates an example method performed by a wireless device in a wireless communication system.

[0226] In step S1001, the wireless device may receive system information including a Channel State Information Reference Signal (CSI-RS) and / or a Tracking Reference Signal (TRS) configuration.

[0227] For example, the wireless device may receive system information including CSI-RS and / or TRS configurations before or during the first modification period.

[0228] For example, the system information including the CSI-RS and / or TRS configuration may be SIB17 (System Information Block Type 17).

[0229] For example, the wireless device may receive an availability indication for a CSI-RS and / or TRS configuration.

[0230] For example, the availability indication may indicate whether a TRS resource set group included in the system information is available and the available period of the available TRS resource set group. For example, the availability indication may be transmitted via a PEI (Paging Early Indication) or a paging DCI. Here, the availability indication may be transmitted via a PEI (Paging Early Indication) or a paging DCI.

[0231] In step S1002, the wireless device may apply the CSI-RS and / or TRS configuration.

[0232] The wireless device may perform time and / or frequency synchronization based on the CSI-RS and / or TRS configuration.

[0233] For example, the wireless device may apply the CSI-RS and / or TRS configuration based on receiving an availability indication for the CSI-RS and / or TRS configuration, i.e., the wireless device may apply the CSI-RS and / or TRS configuration for synchronization only if the availability indicator indicates that the CSI-RS and / or TRS configuration is valid.

[0234] In step S1003, the wireless device may receive a system information change indication within a first modification period.

[0235] For example, the system information change indication may indicate whether at least one system information block including the system information is changed, i.e., if the wireless device receives a system information change indication (SI change indication), the wireless device may assume that one or more system information blocks are changed.

[0236] However, the wireless device does not know which SIB will be changed. After receiving SIB1 in the next modification period (i.e., the second modification period in step S1004), the wireless device knows which SIB will be changed.

[0237] In step S1004, the wireless device may consider the CSI-RS and / or TRS configuration to be invalid from the start of the second modification period.

[0238] Because a SIB (e.g., SIB17) containing the CSI-RS and / or TRS configuration may be changed, the wireless device may assume that the CSI-RS and / or TRS configuration is invalid from the start of the second modification period.

[0239] The wireless device may assume that the CSI-RS and / or TRS configuration is not valid until confirmation from SIB1 that the SIB containing the CSI-RS and / or TRS configuration will not be changed. For example, the wireless device may confirm that the SIB containing the CSI-RS and / or TRS configuration will not be changed by a value tag for the SIB included in SIB1.

[0240] In step S1005, the wireless device can perform synchronization based on at least one Synchronization Signal and Physical Broadcast CHannel (PBCH) block (SSB).

[0241] For example, a wireless device can receive System Information Block Type 1 (SIB1) after time and / or frequency synchronization based on SSB.

[0242] For example, upon receiving a System Information Modified Indication (SI Modified Indication), the wireless device wakes up at the start of a second Modified Period by performing synchronization using SSB.

[0243] That is, based on SIB1 indicating that system information including the CSI-RS and / or TRS configuration has changed, the wireless device can determine whether the CSI-RS and / or TRS configuration is valid.

[0244] For example, SIB1 may include value tags for system information including CSI-RS and / or TRS configurations, and based on the value tags included in SIB1 being the same as the value tags stored in the wireless device, the wireless device may determine that the CSI-RS and / or TRS configurations are valid.

[0245] For example, the wireless device may receive a first SIB1 including a first value tag for a SIB including CSI-RS and / or TRS configuration before or during a first modification period and store the first value tag. Thereafter, the wireless device may receive a second SIB1 including a second value tag for a SIB including CSI-RS and / or TRS configuration during a second modification period.

[0246] If the wireless device determines from SIB1 that the CSI-RS and / or TRS configuration is still valid, the wireless device may apply the CSI-RS and / or TRS configuration, e.g., the wireless device may perform synchronization using the CSI-RS and / or TRS configuration until it receives the next SI change instruction.

[0247] Otherwise, if the wireless device determines from SIB1 that the CSI-RS and / or TRS configuration is still invalid, the wireless device may not use the CSI-RS and / or TRS configuration, e.g., the wireless device may perform synchronization using SSBs until it receives another valid CSI-RS and / or TRS configuration.

[0248] Here, the second modification period may be the next modification period following the first modification period.

[0249] According to some embodiments of the present disclosure, the wireless device may communicate with at least one of a user device other than the wireless device, a network, or an autonomous vehicle.

[0250] The following describes technical features related to the effectiveness of the CSI-RS / TRS configuration.

[0251] Effectiveness of CSI-RS / TRS configuration

[0252] If the UE receives a system information change indication within the Nth modification period, the UE may consider SIB-x (i.e., CSI-RS / TRS configuration) to be temporarily invalid from the start of the N+1th modification period.

[0253] SIB-x may be system information used to transmit CSI-RS / TRS configuration.

[0254] After acquiring SIB1 in the N+1th modification period, the UE can determine, based on the value tag for SIB-x indicated in the acquired SIB1, whether the CSI-RS / TRS configuration that was valid during the Nth modification period is also valid for the N+1th modification period.

[0255] If the value tag of SIB-x is not changed (i.e., the value tag of SIB-x that was valid during the Nth modification period is the same as the value tag of SIB-x indicated in the acquired SIB1), the UE may consider the CSI-RS / TRS configuration that was valid during the Nth modification period to be valid from the N+1th modification period onwards, otherwise the UE may consider it to be invalid in the N+1th modification period.

[0256] FIG. 11 shows an example of handling the validity of the CSI-RS / TRS configuration.

[0257] Referring to FIG. 11, the UE may have a valid SIB-x (i.e., CSI-RS / TRS configuration) and the value tag for SIB-x may be '01010'.

[0258] The UE may receive an SI change instruction during the Nth modification period.

[0259] The UE may consider that a SIB-x with a "01010" value tag is invalid at A, which is the boundary between two modification periods.

[0260] The UE may start from the beginning of the N+1th modification period and synchronize with the serving cell using SSB (not CSI-RS / TRS).

[0261] The UE receives SIB1 at B and may check whether SIB-x has been updated (i.e., whether the value tag for SIB-x has changed). The value tag indicated in the received SIB1 for SIB-x may be "01010".

[0262] The UE may consider SIB-x with value tag "01010" to be valid in B.

[0263] CSI-RS / TRS Availability Indication Application

[0264] The CSI-RS / TRS availability indicator can indicate which TRS resource set groups configured in a valid SIB-x can be used and the period during which they can be used.

[0265] For example, the CSI-RS / TRS availability indication is transmitted via the PEI or the paging DCI.

[0266] For example, the UE may apply the CSI-RS / TRS availability indication only to valid CSI-RS / TRS configurations.

[0267] For example, the UE may apply the CSI-RS / TRS availability indication only if it has a valid CSI-RS / TRS configuration.

[0268] For example, a UE may use CSI-RS / TRS (e.g., for time / frequency synchronization) only if the CSI-RS / TRS configuration is valid and the CSI-RS / TRS availability indication indicates that CSI-RS / TRS is available.

[0269] FIG. 12 shows an example of applying the CSI-RS / TRS availability indicator.

[0270] In step S1201, the UE may receive a valid configuration for TRS resource set groups #1, #2, and #3 via SIB-x. The UE may consider the TRS resource set groups #1, #2, and #3 to be unavailable.

[0271] In step S1202, the UE may receive a CSI-RS / TRS availability indication via the PEI indicating that TRS resource set groups #1 and #2 are available for use. The UE may consider that TRS resource set groups #1 and #2 are available for use, but TRS resource set group #3 is unavailable.

[0272] In step S1203, the UE may receive the SI change instruction within the Nth modification period. The UE may consider the configurations for the TRS resource set groups #1, #2, and #3 to be no longer valid from the moment the N+1th modification period begins.

[0273] Since the UE does not have a valid configuration for CSI-RS / TRS, it cannot assume that it will receive an availability indication for CSI-RS / TRS even if a PEI is received that includes an availability indication for CSI-RS / TRS.

[0274] Validity of CSI-RS / TRS Availability Indication

[0275] If the UE receives a system information change indication within the Nth modification period, the UE may consider all CSI-RS / TRS to have expired (i.e., they will become temporarily unavailable when the N+1th modification period begins).

[0276] If the UE receives a system information change indication within the Nth modification period, the UE may assume that the availability timers for all CSI-RS / TRS expire at the beginning of the N+1th modification period.

[0277] If the UE receives a system information change indication within the Nth modification period, the UE may ignore the CSI-RS / TRS availability indication from the start of the N+1th modification period until it acquires SIB1 in the N+1th modification period.

[0278] FIG. 13 shows an example of a synchronization signal and a PBCH block.

[0279] In particular, FIG. 13 shows the time-frequency structure of SSB.

[0280] An SSB (Synchronization Signal and PBCH block) consists of a primary and secondary synchronization signal (PSS, SSS) each occupying one symbol and 127 subcarriers, and a PBCH spanning three OFDM symbols and 240 subcarriers. However, within a symbol, there is an unused portion for the SSS as shown in Figure 13. The possible time positions of the SSBs within a half frame are determined by the subcarrier spacing, and the period of the half frame during which the SSBs are transmitted is configured by the network. During a half frame, different SSBs are transmitted in different spatial directions (i.e., across the coverage area of ​​the cell using different beams).

[0281] Within the frequency range of a carrier, multiple SSBs are transmitted. The PCIs of SSBs transmitted at different frequency locations do not need to be unique (i.e., different SSBs in the frequency domain can have different PCIs). However, when an SSB is associated with an RMSI, the SSB is called a Cell-Defining SSB (CD-SSB). The PCell is always connected with the CD-SSB in the synchronization raster.

[0282] For example, Polar coding can be used for the PBCH.

[0283] The UE may assume band-specific subcarrier spacing for SSBs, unless the network configures the UE to assume a different subcarrier spacing.

[0284] The PBCH symbols carry a unique frequency multiplexed DMRS.

[0285] QPSK modulation is used for the PBCH.

[0286] Table 6 shows an example of a SIB that includes a TRS configuration.

[0287] For example, the SIB containing the TRS configuration may be SIB17, i.e., SIB17 contains the TRS resource configuration for idle / inactive UEs.

[0288] Here, Table 6 shows an example of SIB17 information elements.

[0289] [Table 6]

[0290] The SIB17 field descriptions are as follows:

[0291] segmentContainer: This field contains the segments of the encoded SIB17-IE. The size of the segments contained in this container must be less than or equal to the maximum size of the NRSI SIB message size (i.e., 2976 bits when SIB17 is broadcast).

[0292] segmentNumber: This field identifies the sequence number of the SIB17-IE segment. Segment number 0 corresponds to the first segment, segment number 1 corresponds to the second segment, and so on.

[0293] SegmentType: A field that indicates whether the included segment is the last segment or not.

[0294] trs-ResourceSetConfig: N>=1 This is the RS configuration of the TRS situation for an idle / inactive UE in terms of the NZP TRS resource set list. The maximum number of TRS resource sets that can be configured at higher layers is 64. When a TRS resource is configured, the L1-based availability indication is always activated according to the configuration. A UE that has acquired SIB17 in the TRS configuration but has not yet received the associated L1-based availability indication shall consider the configured TRS to be unavailable. If SIB scheduling indicates that SIB17 has changed, the UE shall consider the configured TRS(s) to be unavailable until it receives the associated L1-based availability indication(s).

[0295] validDuration: the valid duration for the L1 availability indication, the time unit is one basic paging cycle. When the field is absent, the UE assumes the basic time duration to be two basic paging cycles. This field is only valid while the UE has a valid SIB17.

[0296] The TRS-ResourceSet field description is as follows:

[0297] firstOFDMSymbolInTimeDomain: The first OFDM symbol index of the PRB used for TRS in a slot. This field indicates the first symbol in a slot for the first TRS resource in the slot, and the symbol for the second TRS resource in the same slot can be implicitly derived using a symbol index such as firstOFDMSymbolInTimeDomain+4.

[0298] Frequency Domain Allocation: Indicates the offset of the first RE up to RE#0 in the RB of row1.

[0299] indBitID: is the index of the associated bit in the TRS availability indicator field of the DCI. Each TRS resource set is configured with IDi for association with the (i+1)th indication bit of the TRS availability indicator field of the DCI.

[0300] nrofRBs: The number of PRBs spanned by the corresponding TRS resource.

[0301] nrofResources: The number of TRS resources for the TRS resource set.

[0302] periodicityAndOffset: The periodicity product slot offset (slots) for a periodic TRS. Used to determine the first slot position of a TRS resource set. The periodicity value Slot10 corresponds to 10 slots, and the value Slot20 corresponds to 20 slots.

[0303] powerControlOffsetSS: Power offset (dB) of NZPCSI-RSRE relative to SSSRE.

[0304] scramblingID-Info: One or more scrambling IDs are configured for the TRS resource set. If a common scrambling ID is configured, it applies to all TRS resources in the TRS resource set. Otherwise, each TRS resource in the TRS resource set is provided with a scrambling ID. If the number of TRS resources for the TRS resource set is 2, scramblingIDperResourceListWith2-r17 is configured, and if the number of TRS resources for the TRS resource set is 4, scramblingIDperResourceListWith4-r17 is configured.

[0305] ssb-Index: The index of the reference SSB for which the quasi-sequence information is provided.

[0306] startRB: the PRB index where the corresponding TRS resource starts based on common resource block #0 (CRB#0) in the common resource block grid.

[0307] Among the detailed steps shown in the examples of Figures 10, 11, and 12, some are not essential steps and can be omitted. Other steps may be added and the order of steps may be different than those shown in Figures 10, 11, and 12. Some of the above steps have specific technical meanings.

[0308] An apparatus for handling CSI-RS / TRS configuration availability in a wireless communication system according to some embodiments of the present invention will now be described, where the apparatus may be the wireless device (100 or 200) in FIGS.

[0309] For example, a wireless device may perform the methods described above, and details that overlap with those described above may be simplified or omitted.

[0310] Referring to FIG. 5, the wireless device 100 may include a processor 102, a memory 104, and a transceiver 106.

[0311] According to embodiments of the present disclosure, the processor 102 can be configured to be operatively coupled to the memory 104 and the transceiver 106 .

[0312] The processor 102 is adapted to control the transceiver 106 to receive system information including a Channel State Information Reference Signal (CSI-RS) and / or a Tracking Reference Signal (TRS) configuration. The processor 102 is adapted to apply the CSI-RS and / or the TRS configuration. The processor 102 is adapted to control the transceiver 106 to receive a system information change indication within a first modification period. The processor 102 is adapted to consider that the CSI-RS and / or the TRS configuration is not valid from the start of a second modification period. The processor 102 is adapted to perform synchronization based on at least one synchronization signal and a PBCH block (SSB).

[0313] For example, the processor 102 is adapted to perform time and / or frequency synchronization based on the CSI-RS and / or TRS configurations.

[0314] For example, the processor 102 is adapted to control the transceiver 106 to receive a system information block type 1 (SIB1) after time and / or frequency synchronization based on the SSB.

[0315] For example, the processor 102 is adapted to determine whether the CSI-RS and / or TRS configuration is valid based on SIB1 indicating that system information including the CSI-RS and / or TRS configuration is changed.

[0316] For example, SIB1 may include value tags for system information including CSI-RS and / or TRS configuration.

[0317] For example, the processor 102 may be adapted to determine whether the CSI-RS and / or TRS configuration is valid based on a value tag included in the SIB1 that is the same as a value tag stored in the wireless device.

[0318] For example, the second modification period may be the next modification period following the first modification period.

[0319] For example, the system information change indication may indicate whether at least one of the system information including the system information is changed.

[0320] For example, the processor 102 is adapted to control the transceiver 106 to receive an availability indication for the CSI-RS and / or TRS configuration.

[0321] For example, the availability indication may notify which TRS resource set groups among the TRS resource set groups included in the system information are available and the availability period of the available TRS resource set groups.

[0322] For example, the availability indication is transmitted via a Paging Early Indication (PEI) or a paging DCI.

[0323] For example, the availability indication is transmitted via a Paging Early Indication (PEI) or a paging DCI.

[0324] For example, the processor 102 is adapted to apply the CSI-RS and / or TRS configuration based on receiving an availability indication for the CSI-RS and / or TRS configuration.

[0325] For example, the processor 102 is adapted to control the transceiver 106 to communicate with at least one of a non-wireless user device, a network, or an autonomous vehicle.

[0326] A processor for a wireless device for processing CSI-RS / TRS configuration availability in a wireless communication system in accordance with some embodiments of the present invention will now be described.

[0327] The processor is adapted to control the wireless device to receive system information including a Channel State Information Reference Signal (CSI-RS) and / or a Tracking Reference Signal (TRS) configuration. The processor is adapted to control the wireless device to apply the CSI-RS and / or the TRS configuration. The processor is adapted to control the wireless device to receive a system information change indication within a first modification period. The processor is adapted to control the wireless device to consider the CSI-RS and / or the TRS configuration as not valid from a start of a second modification period. The processor is adapted to control the wireless device to perform synchronization based on at least one synchronization signal and a PBCH block (SSB).

[0328] For example, the processor may be adapted to control the wireless device to perform time and / or frequency synchronization based on the CSI-RS and / or TRS configuration.

[0329] For example, the processor may be adapted to control the wireless device to receive a system information block type 1 (SIB1) after time and / or frequency synchronization based on the SSB.

[0330] For example, the processor is adapted to control the wireless device to determine whether the CSI-RS and / or TRS configuration is valid based on SIB1 indicating that system information including the CSI-RS and / or TRS configuration is changed.

[0331] For example, SIB1 may include value tags for system information including CSI-RS and / or TRS configuration.

[0332] For example, the processor may be adapted to control the wireless device to determine whether the CSI-RS and / or TRS configuration is valid based on a value tag included in the SIB1 that is the same as a value tag stored in the wireless device.

[0333] For example, the second modification period may be the next modification period following the first modification period.

[0334] For example, the system information change indication may indicate whether at least one of the system information including the system information is changed.

[0335] For example, the processor may be adapted to control the wireless device to receive an availability indication for a CSI-RS and / or a TRS configuration.

[0336] For example, the availability indication may notify which TRS resource set groups among the TRS resource set groups included in the system information are available and the availability period of the available TRS resource set groups.

[0337] For example, the availability indication is transmitted via a Paging Early Indication (PEI) or a paging DCI.

[0338] For example, the availability indication is transmitted via a Paging Early Indication (PEI) or a paging DCI.

[0339] For example, the processor may be adapted to control the wireless device to apply the CSI-RS and / or TRS configuration based on receiving an availability indication for the CSI-RS and / or TRS configuration.

[0340] For example, the processor is adapted to control a wireless device to communicate with at least one of a non-wireless user device, a network, or an autonomous vehicle.

[0341] For example, the processor is adapted to control a wireless device to communicate with at least one of a non-wireless user device, a network, or an autonomous vehicle.

[0342] Described below is a non-transitory computer readable medium having instructions stored thereon for handling CSI-RS / TRS configuration validity in a wireless communication system in accordance with some embodiments of the present invention.

[0343] According to some embodiments of the present invention, the technical features of the present invention can be directly implemented in hardware, in software executed by a processor, or in a combination of these. For example, the method performed by a wireless device in wireless communication can be implemented in hardware, software, firmware, or any combination of these. For example, the software can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or other storage medium.

[0344] In some examples of a storage medium, the processor may be coupled to the processor such that the processor can read information from the storage medium. In the alternative, the storage medium may be integral to the processor. In the alternative, the processor and the storage medium may reside in an ASIC. In other examples, the processor and the storage medium may reside as separate components.

[0345] Computer-readable media includes tangible, non-transitory computer-readable storage media.

[0346] For example, non-transitory computer readable media includes random access memory (RAM), such as synchronous dynamic random access memory (SDRAM), read-only memory (ROM), non-volatile random access memory (NVRAM), electrically erasable programmable read-only memory (EEPROM), flash memory, magnetic or optical data storage media, or other media that can be used to store instructions or data structures, and non-transitory computer readable media includes combinations thereof.

[0347] Additionally, the methods described herein may be realized at least in part by a computer-readable communication medium that conveys or communicates code, such as instructions or data structures, in a form that can be accessed, read, and / or executed by a computer.

[0348] According to some embodiments herein, a non-transitory computer readable medium has instructions stored thereon, the instructions being executable by a processor of a wireless device.

[0349] The stored instructions may be configured to control the wireless device to receive system information including a Channel State Information Reference Signal (CSI-RS) and / or a Tracking Reference Signal (TRS) configuration. The stored instructions may be configured to control the wireless device to apply the CSI-RS and / or TRS configuration. The stored instructions may be configured to control the wireless device to receive a system information change indication within a first modification period. The stored instructions may be configured to control the wireless device to consider the CSI-RS and / or TRS configuration as not valid from a start of a second modification period. The stored instructions may be configured to control the wireless device to perform synchronization based on at least one synchronization signal and a PBCH block (SSB).

[0350] For example, the stored instructions may be configured to control a wireless device to perform time and / or frequency synchronization based on a CSI-RS and / or TRS configuration.

[0351] For example, the stored instructions may be configured to control a wireless device to receive a system information block type 1 (SIB1) after time and / or frequency synchronization based on an SSB.

[0352] For example, the stored instructions may be configured to control the wireless device to determine whether the CSI-RS and / or TRS configuration is valid based on SIB1 indicating that system information including the CSI-RS and / or TRS configuration is to be changed.

[0353] For example, SIB1 may include value tags for system information including CSI-RS and / or TRS configuration.

[0354] For example, the stored instructions may be configured to control the wireless device to determine whether a CSI-RS and / or TRS configuration is valid based on a value tag included in SIB1 that is the same as a value tag stored in the wireless device.

[0355] For example, the second modification period may be the next modification period following the first modification period.

[0356] For example, the system information change indication may indicate whether at least one of the system information including the system information is changed.

[0357] For example, the stored instructions may be configured to control a wireless device to receive an availability indication for a CSI-RS and / or a TRS configuration.

[0358] For example, the availability indication may indicate whether or not a TRS resource set group included in the system information is available and the availability period of the available TRS resource set group.

[0359] For example, the availability indication is transmitted via a Paging Early Indication (PEI) or a paging DCI.

[0360] For example, the availability indication is transmitted via a Paging Early Indication (PEI) or a paging DCI.

[0361] For example, the stored instructions may be configured to control the wireless device to apply a CSI-RS and / or TRS configuration based on receiving an availability indication for the CSI-RS and / or TRS configuration.

[0362] For example, the stored instructions may be configured to control a wireless device to communicate with at least one of a non-wireless user device, a network, or an autonomous vehicle.

[0363] For example, the stored instructions may be configured to control a wireless device to communicate with at least one of a non-wireless user device, a network, or an autonomous vehicle.

[0364] A base station (BS) that processes the availability of CSI-RS / TRS configuration in a wireless communication system according to some embodiments of the present invention will now be described.

[0365] The base station may include a transceiver, a memory, and a processor operatively connected to the transceiver and the memory.

[0366] The processor is adapted to provide system information including a Channel State Information Reference Signal (CSI-RS) and / or a Tracking Reference Signal (TRS) configuration. The processor is adapted to provide a system information change indication within a first modification period. The processor is adapted to provide a System Information Block Type 1 (SIB1).

[0367] The present invention has various advantages.

[0368] According to some embodiments of the present disclosure, a wireless device can efficiently handle the availability of CSI-RS / TRS configurations.

[0369] For example, after receiving a system information change notification, a wireless device may cease using a potentially outdated CSI-RS / TRS configuration, thereby allowing the wireless device to successfully receive updated system information.

[0370] That is, for example, if a system information change notification is received within a modification period, the wireless device may consider the CSI-RS / TRS configuration to be invalid from the start of the next modification period. In this case, the wireless device may not perform synchronization related to the CSI-RS / TRS configuration during the next modified period. Thus, the wireless device may avoid performing synchronization using an old CSI-RS / TRS configuration. Also, resources may be saved by preventing synchronization failures using an old CSI-RS / TRS configuration.

[0371] According to some embodiments of the present disclosure, a wireless communication system can provide an efficient solution for handling CSI-RS / TRS configuration availability.

[0372] The effects obtained by the specific examples of the present specification are not limited to the effects described above. For example, there may be various technical effects that a person having ordinary skill in the related art can understand or derive from the present specification. Thus, the specific effects of the present specification are not limited to those explicitly described in the present specification, but include various effects that can be understood or derive from the technical features of the present specification.

[0373] The claims described herein may be combined in various ways. For example, the technical features of the method claims herein may be combined and realized as an apparatus, and the technical features of the apparatus claims herein may be combined and realized as a method. Also, the technical features of the method claims herein and the technical features of the apparatus claims herein may be combined and realized as an apparatus, and the technical features of the method claims herein and the technical features of the apparatus claims herein may be combined and realized as a method. Other implementations are within the scope of the following claims:

Claims

1. 1. A method performed by a wireless device in a wireless communication system, comprising: receiving system information including a Channel State Information Reference Signal (CSI-RS) and / or a Tracking Reference Signal (TRS) configuration; applying the CSI-RS and / or TRS configuration; receiving a system information change indication within a first modification period; considering the CSI-RS and / or TRS configuration invalid from the start of a second modification period; and performing synchronization based on at least one Synchronization Signal and Physical Broadcast CHANNEL (PBCH).

2. 2. The method of claim 1, further comprising the step of performing time and / or frequency synchronization based on the CSI-RS and / or TRS configuration.

3. The method according to claim 1, further comprising the step of receiving a System Information Block Type 1 (SIB1) after time and / or frequency synchronization based on the SSB.

4. 4. The method of claim 3, further comprising the step of determining whether the CSI-RS and / or TRS configuration is valid based on the SIB1 informing that the system information including the CSI-RS and / or TRS configuration is to be changed.

5. The method of claim 3, wherein the SIB1 includes a value tag for the system information including the CSI-RS and / or TRS configuration.

6. 6. The method of claim 5, further comprising: determining that the CSI-RS and / or TRS configuration is valid based on the value tag included in the SIB1 being the same as a value tag stored in the wireless device.

7. 2. The method of claim 1, wherein the second correction period is the next correction period following the first correction period.

8. 2. The method of claim 1, wherein the system information change indication indicates whether at least one system information including the system information is changed.

9. 2. The method of claim 1, further comprising the step of receiving an availability indication for the CSI-RS and / or TRS configuration.

10. The method of claim 9, wherein the availability indication notifies which TRS resource set groups among the TRS resource set groups included in the system information are available and a usage period of the available TRS resource set groups.

11. The method of claim 9, wherein the availability indication is transmitted via a Paging Early Indication (PEI) or a Paging DCI.

12. The method of claim 9, wherein the availability indication is transmitted via a Paging Early Indication (PEI) or a Paging DCI.

13. 10. The method of claim 9, further comprising: applying the CSI-RS and / or TRS configuration based on receiving the availability indication for the CSI-RS and / or TRS configuration.

14. 10. The method of claim 1, wherein the wireless device communicates with at least one of a user device other than the wireless device, a network, or an autonomous vehicle.

15. In a wireless communication system, a wireless device A transceiver; Memory, and at least one processor operatively connected to the transceiver and the memory, the at least one processor comprising: receiving system information including a Channel State Information Reference Signal (CSI-RS) and / or a Tracking Reference Signal (TRS) configuration; applying the CSI-RS and / or TRS configuration; receiving a system information change indication within a first modification period; considering the CSI-RS and / or TRS configuration invalid from the start of a second modification period; performing synchronization based on at least one Synchronization Signal and Physical Broadcast CHANNEL (PBCH), said wireless device being configured to:

16. The at least one processor The wireless device of claim 15, further configured to perform the step of performing time and / or frequency synchronization based on the CSI-RS and / or TRS configuration.

17. The at least one processor 16. The wireless device of claim 15, further configured to receive a System Information Block Type 1 (SIB1) after time and / or frequency synchronization based on the SSB.

18. The at least one processor The wireless device of claim 17, further configured to perform a step of determining whether the CSI-RS and / or TRS configuration is valid based on the SIB1 indicating that the system information including the CSI-RS and / or TRS configuration is to be changed.

19. The wireless device of claim 17, wherein the SIB1 includes a value tag for the system information including the CSI-RS and / or TRS configuration.

20. The at least one processor 20. The wireless device of claim 19, further configured to perform the step of determining that the CSI-RS and / or TRS configuration is valid based on the value tag included in the SIB1 being the same as a value tag stored in the wireless device.

21. 16. The wireless device of claim 15, wherein the second modification period is a subsequent modification period following a first modification period.

22. The at least one processor 16. The wireless device of claim 15, wherein the system information change indication indicates whether at least one of the system information including the system information is changed.

23. The at least one processor The wireless device of claim 15, further configured to perform the step of receiving an availability indication for the CSI-RS and / or TRS configuration.

24. The wireless device of claim 23, wherein the availability indication notifies which TRS resource set group among the TRS resource set groups included in the system information can be used and a period during which the available TRS resource set group can be used.

25. 24. The wireless device of claim 23, wherein the availability indication is transmitted via a Paging Early Indication (PEI) or a Paging DCI.

26. 24. The wireless device of claim 23, wherein the availability indication is transmitted via a Paging Early Indication (PEI) or a Paging DCI.

27. 24. The wireless device of claim 23, further comprising: applying the CSI-RS and / or TRS configuration based on receiving the availability indication for the CSI-RS and / or TRS configuration.

28. 16. The wireless device of claim 15, wherein the at least one processor is further configured to communicate with at least one of a user device other than the wireless device, a network, or an autonomous vehicle.

29. As a processor for a wireless device in a wireless communication system, the processor is configured to cause the wireless device to perform operations, the operations including: receiving system information including a Channel State Information Reference Signal (CSI-RS) and / or a Tracking Reference Signal (TRS) configuration; applying the CSI-RS and / or TRS configuration; receiving a system information change indication within a first modification period; considering the CSI-RS and / or TRS configuration invalid from the start of a second modification period; and performing synchronization based on at least one Synchronization Signal and Physical Broadcast CHANNEL (PBCH).

30. In a wireless communication system, a non-transitory computer-readable medium having stored thereon a plurality of instructions pursuant to which execution by a processor of a wireless device is performed, the plurality of instructions comprising: receiving system information including a Channel State Information Reference Signal (CSI-RS) and / or a Tracking Reference Signal (TRS) configuration; applying the CSI-RS and / or TRS configuration; receiving a system information change indication within a first modification period; considering the CSI-RS and / or TRS configuration invalid from the start of a second modification period; and performing synchronization based on at least one Synchronization Signal and Physical Broadcast CHANNEL (PBCH).

31. 1. A method performed by a basestation in a wireless communication system, comprising: providing system information including a Channel State Information Reference Signal (CSI-RS) and / or a Tracking Reference Signal (TRS) configuration; providing a system information change indication within a first modification period; providing a System Information Block Type 1 (SIB1).

32. In a base station in a wireless communication system, A transceiver; Memory, and at least one processor operatively connected to the transceiver and the memory, the at least one processor comprising: providing system information including a Channel State Information Reference Signal (CSI-RS) and / or a Tracking Reference Signal (TRS) configuration; providing a system information change indication within a first modification period; providing a System Information Block Type 1 (SIB1).

Images