Method and apparatus for measurements for cell reselection based on stored configuration

Abstract

A method and apparatus for measurements for cell reselection based on stored configuration is provided. A wireless device receives, from a network, a conditional mobility configuration including (i) information related to a pre-configured condition related to a target cell and (ii) information related to validity of the pre-configured condition. The wireless device enters an RRC_IDLE state or an RRC_INACTIVE state. While the pre-configured condition is valid: the wireless device performs measurements only for a serving cell and the target cell, and reselects the target cell, based on the pre-configured condition being met.

Description

METHOD AND APPARATUS FOR MEASUREMENTS FOR CELL RESELECTION BASED ON STORED CONFIGURATION

[0001] The present disclosure relates to a method and apparatus for measurements for cell reselection based on stored configuration.

[0002] 3rd generation partnership project (3GPP) long-term evolution (LTE) is a technology for enabling high-speed packet communications. Many schemes have been proposed for the LTE objective including those that aim to reduce user and provider costs, improve service quality, and expand and improve coverage and system capacity. The 3GPP LTE requires reduced cost per bit, increased service availability, flexible use of a frequency band, a simple structure, an open interface, and adequate power consumption of a terminal as an upper-level requirement.

[0003] Work has started in international telecommunication union (ITU) and 3GPP to develop requirements and specifications for new radio (NR) systems. 3GPP has to identify and develop the technology components needed for successfully standardizing the new RAT timely satisfying both the urgent market needs, and the more long-term requirements set forth by the ITU radio communication sector (ITU-R) international mobile telecommunications (IMT)-2020 process. Further, the NR should be able to use any spectrum band ranging at least up to 100 GHz that may be made available for wireless communications even in a more distant future.

[0004] The NR targets a single technical framework addressing all usage scenarios, requirements and deployment scenarios including enhanced mobile broadband (eMBB), massive machine-type-communications (mMTC), ultra-reliable and low latency communications (URLLC), etc. The NR shall be inherently forward compatible.

[0005] While UE in RRC_IDLE / INACTIVE is allowed to reselect only the pre-configured target cell, e.g., while performing the pre-configured condition-based cell reselection, the UE does not need to measure neighbour cells except for the pre-configured target cell.

[0006] However, UE in RRC_IDLE / INACTIVE is required to measure inter-frequencies / neighbour cells indicated in SIB4 for cell reselection. It causes unnecessary UE power consumption to measure neighbour cells that the UE cannot reselect.

[0007] Therefore, studies for measurements for cell reselection based on stored configuration are required.

[0008] In an aspect, a method comprises: receiving, by a wireless device from a network, a conditional mobility configuration including (i) information related to a pre-configured condition related to a target cell and (ii) information related to validity of the pre-configured condition; and entering, by the wireless device, a radio resource control (RRC)_IDLE state or an RRC_INACTIVE state; while the pre-configured condition is valid: - performing, by the wireless device, measurements only for a serving cell and the target cell; and - reselecting, by the wireless device, the target cell, based on the pre-configured condition being met.

[0009] In another aspect, an apparatus for implementing the above method is provided.

[0010] The present disclosure can have various advantageous effects.

[0011] According to some embodiments of the present disclosure, the wireless device could efficiently perform measurements for cell reselection based on stored configuration.

[0012] For example, UE in RRC_IDLE / INACTIVE performs measurements according to SIB2, 3, 4, and 5 for cell reselection procedure. That is, UE should measure inter-frequencies indicated in SIB4. However, if UE in RRC_IDLE / INACTIVE can reselect only the target cell associated with the pre-configured condition, the UE doesn't need to measure neighbour frequencies / cells indicated in SIB4 except for target cells associated preconfigured conditions.

[0013] While performing the preconfigured condition-based cell reselection, if the UE is not required to perform the normal cell reselection procedure, the UE can save its power by not performing the measurements on inter-frequencies / neighbour cells indicated in SIB4.

[0014] In other words, a wireless device can save power by reducing measurements for neighbour cells in the inactive state or the idle state.

[0015] According to some embodiments of the present disclosure, the wireless communication system could provide an efficient solution for measurements for cell reselection based on stored configuration.

[0016] Advantageous effects which can be obtained through specific embodiments of the present disclosure are not limited to the advantageous effects listed above. For example, there may be a variety of technical effects that a person having ordinary skill in the related art can understand and / or derive from the present disclosure. Accordingly, the specific effects of the present disclosure are not limited to those explicitly described herein, but may include various effects that may be understood or derived from the technical features of the present disclosure.

[0017] FIG. 1 shows an example of a communication system to which implementations of the present disclosure is applied.

[0018] FIG. 2 shows an example of wireless devices to which implementations of the present disclosure is applied.

[0019] FIG. 3 shows an example of a wireless device to which implementations of the present disclosure is applied.

[0020] FIG. 4 shows another example of wireless devices to which implementations of the present disclosure is applied.

[0021] FIG. 5 shows an example of UE to which implementations of the present disclosure is applied.

[0022] FIGS. 6 and 7 show an example of protocol stacks in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.

[0023] FIG. 8 shows a frame structure in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.

[0024] FIG. 9 shows a data flow example in the 3GPP NR system to which implementations of the present disclosure is applied.

[0025] FIG. 10 shows an example of a method for measurements for cell reselection based on stored configuration, according to some embodiments of the present disclosure.

[0026] FIG. 11 shows an example of a preconfigured condition based cell reselection.

[0027] FIG. 12 shows an example of a measurement rule for preconfigured condition based cell reselection.

[0028] FIG. 13 shows an example of a measurement rule for preconfigured condition based cell reselection.

[0029] FIG. 14 shows an example of a measurement rule for preconfigured condition based cell reselection.

[0030] The following techniques, apparatuses, and systems may be applied to a variety of wireless multiple access systems. Examples of the multiple access systems include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, a single carrier frequency division multiple access (SC-FDMA) system, and a multicarrier frequency division multiple access (MC-FDMA) system. CDMA may be embodied through radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be embodied through radio technology such as global system for mobile communications (GSM), general packet radio service (GPRS), or enhanced data rates for GSM evolution (EDGE). OFDMA may be embodied through radio technology such as institute of electrical and electronics engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, or evolved UTRA (E-UTRA). UTRA is a part of a universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE employs OFDMA in DL and SC-FDMA in UL. LTE-advanced (LTE-A) is an evolved version of 3GPP LTE.

[0031] For convenience of description, implementations of the present disclosure are mainly described in regards to a 3GPP based wireless communication system. However, the technical features of the present disclosure are not limited thereto. For example, although the following detailed description is given based on a mobile communication system corresponding to a 3GPP based wireless communication system, aspects of the present disclosure that are not limited to 3GPP based wireless communication system are applicable to other mobile communication systems.

[0032] For terms and technologies which are not specifically described among the terms of and technologies employed in the present disclosure, the wireless communication standard documents published before the present disclosure may be referenced.

[0033] In the present disclosure, "A or B" may mean "only A", "only B", or "both A and B". In other words, "A or B" in the present disclosure may be interpreted as "A and / or B". For example, "A, B or C" in the present disclosure may mean "only A", "only B", "only C", or "any combination of A, B and C".

[0034] In the present disclosure, slash ( / ) or comma (,) may mean "and / or". For example, "A / B" may mean "A and / or B". Accordingly, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B or C".

[0035] In the present disclosure, "at least one of A and B" may mean "only A", "only B" or "both A and B". In addition, the expression "at least one of A or B" or "at least one of A and / or B" in the present disclosure may be interpreted as same as "at least one of A and B".

[0036] In addition, in the present disclosure, "at least one of A, B and C" may mean "only A", "only B", "only C", or "any combination of A, B and C". In addition, "at least one of A, B or C" or "at least one of A, B and / or C" may mean "at least one of A, B and C".

[0037] Also, parentheses used in the present disclosure may mean "for example". In detail, when it is shown as "control information (PDCCH)", "PDCCH" may be proposed as an example of "control information". In other words, "control information" in the present disclosure is not limited to "PDCCH", and "PDCCH" may be proposed as an example of "control information". In addition, even when shown as "control information (i.e., PDCCH)", "PDCCH" may be proposed as an example of "control information".

[0038] Technical features that are separately described in one drawing in the present disclosure may be implemented separately or simultaneously.

[0039] Although not limited thereto, various descriptions, functions, procedures, suggestions, methods and / or operational flowcharts of the present disclosure disclosed herein can be applied to various fields requiring wireless communication and / or connection (e.g., 5G) between devices.

[0040] Hereinafter, the present disclosure will be described in more detail with reference to drawings. The same reference numerals in the following drawings and / or descriptions may refer to the same and / or corresponding hardware blocks, software blocks, and / or functional blocks unless otherwise indicated.

[0041] FIG. 1 shows an example of a communication system to which implementations of the present disclosure is applied.

[0042] The 5G usage scenarios shown in FIG. 1 are only exemplary, and the technical features of the present disclosure can be applied to other 5G usage scenarios which are not shown in FIG. 1.

[0043] Three main requirement categories for 5G include (1) a category of enhanced mobile broadband (eMBB), (2) a category of massive machine type communication (mMTC), and (3) a category of ultra-reliable and low latency communications (URLLC).

[0044] Partial use cases may require a plurality of categories for optimization and other use cases may focus only upon one key performance indicator (KPI). 5G supports such various use cases using a flexible and reliable method.

[0045] eMBB far surpasses basic mobile Internet access and covers abundant bidirectional work and media and entertainment applications in cloud and augmented reality. Data is one of 5G core motive forces and, in a 5G era, a dedicated voice service may not be provided for the first time. In 5G, it is expected that voice will be simply processed as an application program using data connection provided by a communication system. Main causes for increased traffic volume are due to an increase in the size of content and an increase in the number of applications requiring high data transmission rate. A streaming service (of audio and video), conversational video, and mobile Internet access will be more widely used as more devices are connected to the Internet. These many application programs require connectivity of an always turned-on state in order to push real-time information and alarm for users. Cloud storage and applications are rapidly increasing in a mobile communication platform and may be applied to both work and entertainment. The cloud storage is a special use case which accelerates growth of uplink data transmission rate. 5G is also used for remote work of cloud. When a tactile interface is used, 5G demands much lower end-to-end latency to maintain user good experience. Entertainment, for example, cloud gaming and video streaming, is another core element which increases demand for mobile broadband capability. Entertainment is essential for a smartphone and a tablet in any place including high mobility environments such as a train, a vehicle, and an airplane. Other use cases are augmented reality for entertainment and information search. In this case, the augmented reality requires very low latency and instantaneous data volume.

[0046] In addition, one of the most expected 5G use cases relates a function capable of smoothly connecting embedded sensors in all fields, i.e., mMTC. It is expected that the number of potential Internet-of-things (IoT) devices will reach 204 hundred million up to the year of 2020. An industrial IoT is one of categories of performing a main role enabling a smart city, asset tracking, smart utility, agriculture, and security infrastructure through 5G.

[0047] URLLC includes a new service that will change industry through remote control of main infrastructure and an ultra-reliable / available low-latency link such as a self-driving vehicle. A level of reliability and latency is essential to control a smart grid, automatize industry, achieve robotics, and control and adjust a drone.

[0048] 5G is a means of providing streaming evaluated as a few hundred megabits per second to gigabits per second and may complement fibre-to-the-home (FTTH) and cable-based broadband (or DOCSIS). Such fast speed is needed to deliver TV in resolution of 4K or more (6K, 8K, and more), as well as virtual reality and augmented reality. Virtual reality (VR) and augmented reality (AR) applications include almost immersive sports games. A specific application program may require a special network configuration. For example, for VR games, gaming companies need to incorporate a core server into an edge network server of a network operator in order to minimize latency.

[0049] Automotive is expected to be a new important motivated force in 5G together with many use cases for mobile communication for vehicles. For example, entertainment for passengers requires high simultaneous capacity and mobile broadband with high mobility. This is because future users continue to expect connection of high quality regardless of their locations and speeds. Another use case of an automotive field is an AR dashboard. The AR dashboard causes a driver to identify an object in the dark in addition to an object seen from a front window and displays a distance from the object and a movement of the object by overlapping information talking to the driver. In the future, a wireless module enables communication between vehicles, information exchange between a vehicle and supporting infrastructure, and information exchange between a vehicle and other connected devices (e.g., devices accompanied by a pedestrian). A safety system guides alternative courses of a behaviour so that a driver may drive more safely drive, thereby lowering the danger of an accident. The next stage will be a remotely controlled or self-driven vehicle. This requires very high reliability and very fast communication between different self-driven vehicles and between a vehicle and infrastructure. In the future, a self-driven vehicle will perform all driving activities and a driver will focus only upon abnormal traffic that the vehicle cannot identify. Technical requirements of a self-driven vehicle demand ultra-low latency and ultra-high reliability so that traffic safety is increased to a level that cannot be achieved by human being.

[0050] A smart city and a smart home / building mentioned as a smart society will be embedded in a high-density wireless sensor network. A distributed network of an intelligent sensor will identify conditions for costs and energy-efficient maintenance of a city or a home. Similar configurations may be performed for respective households. All of temperature sensors, window and heating controllers, burglar alarms, and home appliances are wirelessly connected. Many of these sensors are typically low in data transmission rate, power, and cost. However, real-time HD video may be demanded by a specific type of device to perform monitoring.

[0051] Consumption and distribution of energy including heat or gas is distributed at a higher level so that automated control of the distribution sensor network is demanded. The smart grid collects information and connects the sensors to each other using digital information and communication technology so as to act according to the collected information. Since this information may include behaviours of a supply company and a consumer, the smart grid may improve distribution of fuels such as electricity by a method having efficiency, reliability, economic feasibility, production sustainability, and automation. The smart grid may also be regarded as another sensor network having low latency.

[0052] Mission critical application (e.g., e-health) is one of 5G use scenarios. A health part contains many application programs capable of enjoying benefit of mobile communication. A communication system may support remote treatment that provides clinical treatment in a faraway place. Remote treatment may aid in reducing a barrier against distance and improve access to medical services that cannot be continuously available in a faraway rural area. Remote treatment is also used to perform important treatment and save lives in an emergency situation. The wireless sensor network based on mobile communication may provide remote monitoring and sensors for parameters such as heart rate and blood pressure.

[0053] Wireless and mobile communication gradually becomes important in the field of an industrial application. Wiring is high in installation and maintenance cost. Therefore, a possibility of replacing a cable with constructible wireless links is an attractive opportunity in many industrial fields. However, in order to achieve this replacement, it is necessary for wireless connection to be established with latency, reliability, and capacity similar to those of the cable and management of wireless connection needs to be simplified. Low latency and a very low error probability are new requirements when connection to 5G is needed.

[0054] Logistics and freight tracking are important use cases for mobile communication that enables inventory and package tracking anywhere using a location-based information system. The use cases of logistics and freight typically demand low data rate but require location information with a wide range and reliability.

[0055] Referring to FIG. 1, the communication system 1 includes wireless devices 100a to 100f, base stations (BSs) 200, and a network 300. Although FIG. 1 illustrates a 5G network as an example of the network of the communication system 1, the implementations of the present disclosure are not limited to the 5G system, and can be applied to the future communication system beyond the 5G system.

[0056] The BSs 200 and the network 300 may be implemented as wireless devices and a specific wireless device may operate as a BS / network node with respect to other wireless devices.

[0057] The wireless devices 100a to 100f represent devices performing communication using radio access technology (RAT) (e.g., 5G new RAT (NR)) or LTE) and may be referred to as communication / radio / 5G devices. The wireless devices 100a to 100f may include, without being limited to, a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a hand-held device 100d, a home appliance 100e, an IoT device 100f, and an artificial intelligence (AI) device / server 400. For example, the vehicles may include a vehicle having a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing communication between vehicles. The vehicles may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an AR / VR / Mixed Reality (MR) device and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) mounted in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. The hand-held device may include a smartphone, a smart pad, a wearable device (e.g., a smartwatch or a smart glasses), and a computer (e.g., a notebook). The home appliance may include a TV, a refrigerator, and a washing machine. The IoT device may include a sensor and a smart meter.

[0058] In the present disclosure, the wireless devices 100a to 100f may be called user equipment's (UEs). A UE may include, for example, a cellular phone, a smartphone, a laptop computer, a digital broadcast terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation system, a slate personal computer (PC), a tablet PC, an ultrabook, a vehicle, a vehicle having an autonomous traveling function, a connected car, an 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 weather / environment device, a device related to a 5G service, or a device related to a fourth industrial revolution field.

[0059] The UAV may be, for example, an aircraft availed by a wireless control signal without a human being onboard.

[0060] The VR device may include, for example, a device for implementing an object or a background of the virtual world. The AR device may include, for example, a device implemented by connecting an object or a background of the virtual world to an object or a background of the real world. The MR device may include, for example, a device implemented by merging an object or a background of the virtual world into an object or a background of the real world. The hologram device may include, for example, a device for implementing a stereoscopic image of 360 degrees by recording and reproducing stereoscopic information, using an interference phenomenon of light generated when two laser lights called holography meet.

[0061] The public safety device may include, for example, an image relay device or an image device that is wearable on the body of a user.

[0062] The MTC device and the IoT device may be, for example, devices that do not require direct human intervention or manipulation. For example, the MTC device and the IoT device may include smart meters, vending machines, thermometers, smart bulbs, door locks, or various sensors.

[0063] The medical device may be, for example, a device used for the purpose of diagnosing, treating, relieving, curing, or preventing disease. For example, the medical device may be a device used for the purpose of diagnosing, treating, relieving, or correcting injury or impairment. For example, the medical device may be a device used for the purpose of inspecting, replacing, or modifying a structure or a function. For example, the medical device may be a device used for the purpose of adjusting pregnancy. For example, the medical device may include a device for treatment, a device for operation, a device for (in vitro) diagnosis, a hearing aid, or a device for procedure.

[0064] The security device may be, for example, a device installed to prevent a danger that may arise and to maintain safety. For example, the security device may be a camera, a closed-circuit TV (CCTV), a recorder, or a black box.

[0065] The FinTech device may be, for example, a device capable of providing a financial service such as mobile payment. For example, the FinTech device may include a payment device or a point of sales (POS) system.

[0066] The weather / environment device may include, for example, a device for monitoring or predicting a weather / environment.

[0067] The wireless devices 100a to 100f may be connected to the network 300 via the BSs 200. An AI technology may be applied to the wireless devices 100a to 100f and the wireless devices 100a to 100f may be connected to the 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, and a beyond-5G network. Although the wireless devices 100a to 100f may communicate with each other through the BSs 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without passing through the BSs 200 / network 300. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). The IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0068] Wireless communication / connections 150a, 150b and 150c may be established between the wireless devices 100a to 100f and / or between wireless device 100a to 100f and BS 200 and / or between BSs 200. Herein, the wireless communication / connections may be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication (or device-to-device (D2D) communication) 150b, inter-base station communication 150c (e.g., relay, integrated access and backhaul (IAB)), etc. The wireless devices 100a to 100f and the BSs 200 / the wireless devices 100a to 100f may transmit / receive radio signals to / from each other through the wireless communication / connections 150a, 150b and 150c. For example, the wireless communication / connections 150a, 150b and 150c may transmit / receive signals through various physical channels. To this end, at least a part of various configuration information configuring processes, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, and resource mapping / de-mapping), and resource allocating processes, for transmitting / receiving radio signals, may be performed based on the various proposals of the present disclosure.

[0069] Here, the radio communication technologies implemented in the wireless devices in the present disclosure may include narrowband internet-of-things (NB-IoT) technology for low-power communication as well as LTE, NR and 6G. For example, NB-IoT technology may be an example of low power wide area network (LPWAN) technology, may be implemented in specifications such as LTE Cat NB1 and / or LTE Cat NB2, and may not be limited to the above-mentioned names. Additionally and / or alternatively, the radio communication technologies implemented in the wireless devices in the present disclosure may communicate based on LTE-M technology. For example, LTE-M technology may be an example of LPWAN technology and be called by various names such as enhanced machine type communication (mMTC). For example, LTE-M technology may be implemented in at least one of the various specifications, such as 1) LTE Cat 0, 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 may not be limited to the above-mentioned names. Additionally and / or alternatively, the radio communication technologies implemented in the wireless devices in the present disclosure may include at least one of ZigBee, Bluetooth, and / or LPWAN which take into account low-power communication, and may not be limited to the above-mentioned names. For example, ZigBee technology may generate personal area networks (PANs) associated with small / low-power digital communication based on various specifications such as IEEE 802.15.4 and may be called various names.

[0070] FIG. 2 shows an example of wireless devices to which implementations of the present disclosure is applied.

[0071] Referring to FIG. 2, a first wireless device 100 and a second wireless device 200 may transmit / receive radio signals to / from an external device through a variety of RATs (e.g., LTE and NR). In FIG. 2, {the first wireless device 100 and the second wireless device 200} may correspond to at least one of {the wireless device 100a to 100f and the BS 200}, {the wireless device 100a to 100f and the wireless device 100a to 100f} and / or {the BS 200 and the BS 200} of FIG. 1.

[0072] The first wireless device 100 may include one or more processors 102 and one or more memories 104 and additionally further include one or more transceivers 106 and / or one or more antennas 108. The processor(s) 102 may control the memory(s) 104 and / or the transceiver(s) 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts described in the present disclosure. For example, the processor(s) 102 may process information within the memory(s) 104 to generate first information / signals and then transmit radio signals including the first information / signals through the transceiver(s) 106. The processor(s) 102 may receive radio signals including second information / signals through the transceiver(s) 106 and then store information obtained by processing the second information / signals in the memory(s) 104. The memory(s) 104 may be connected to the processor(s) 102 and may store a variety of information related to operations of the processor(s) 102. For example, the memory(s) 104 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 102 or for performing the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts described in the present disclosure. Herein, the processor(s) 102 and the memory(s) 104 may be a part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). The transceiver(s) 106 may be connected to the processor(s) 102 and transmit and / or receive radio signals through one or more antennas 108. Each of the transceiver(s) 106 may include a transmitter and / or a receiver. The transceiver(s) 106 may be interchangeably used with radio frequency (RF) unit(s). In the present disclosure, the first wireless device 100 may represent a communication modem / circuit / chip.

[0073] The second wireless device 200 may include one or more processors 202 and one or more memories 204 and additionally further include one or more transceivers 206 and / or one or more antennas 208. The processor(s) 202 may control the memory(s) 204 and / or the transceiver(s) 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts described in the present disclosure. For example, the processor(s) 202 may process information within the memory(s) 204 to generate third information / signals and then transmit radio signals including the third information / signals through the transceiver(s) 206. The processor(s) 202 may receive radio signals including fourth information / signals through the transceiver(s) 106 and then store information obtained by processing the fourth information / signals in the memory(s) 204. The memory(s) 204 may be connected to the processor(s) 202 and may store a variety of information related to operations of the processor(s) 202. For example, the memory(s) 204 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 202 or for performing the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts described in the present disclosure. Herein, the processor(s) 202 and the memory(s) 204 may be a part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). The transceiver(s) 206 may be connected to the processor(s) 202 and transmit and / or receive radio signals through one or more antennas 208. Each of the transceiver(s) 206 may include a transmitter and / or a receiver. The transceiver(s) 206 may be interchangeably used with RF unit(s). In the present disclosure, the second wireless device 200 may represent a communication modem / circuit / chip.

[0074] Hereinafter, hardware elements of the wireless devices 100 and 200 will be described more specifically. One or more protocol layers may be implemented by, without being limited to, one or more processors 102 and 202. For example, the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as physical (PHY) layer, media access control (MAC) layer, radio link control (RLC) layer, packet data convergence protocol (PDCP) layer, radio resource control (RRC) layer, and service data adaptation protocol (SDAP) layer). The one or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data unit (SDUs) according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. The one or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure and provide the generated signals to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive the signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and acquire the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure.

[0075] The one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in the one or more processors 102 and 202. descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure may be implemented using firmware or software and the firmware or software may be configured to include the modules, procedures, or functions. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure may be included in the one or more processors 102 and 202 or stored in the one or more memories 104 and 204 so as to be driven by the one or more processors 102 and 202. The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure may be implemented using firmware or software in the form of code, commands, and / or a set of commands.

[0076] The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104 and 204 may be configured by read-only memories (ROMs), random access memories (RAMs), electrically erasable programmable read-only memories (EPROMs), flash memories, hard drives, registers, cash memories, computer-readable storage media, and / or combinations thereof. The one or more memories 104 and 204 may be located at the interior and / or exterior of the one or more processors 102 and 202. The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as wired or wireless connection.

[0077] The one or more transceivers 106 and 206 may transmit user data, control information, and / or radio signals / channels, mentioned in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure, to one or more other devices. The one or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels, mentioned in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure, from one or more other devices. For example, the one or more transceivers 106 and 206 may be connected to the one or more processors 102 and 202 and transmit and receive radio signals. For example, the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. The one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices.

[0078] The one or more transceivers 106 and 206 may be connected to the one or more antennas 108 and 208 and the one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and / or radio signals / channels, mentioned in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure, through the one or more antennas 108 and 208. In the present disclosure, the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports).

[0079] The one or more transceivers 106 and 206 may convert received radio signals / channels, etc., from RF band signals into baseband signals in order to process received user data, control information, radio signals / channels, etc., using the one or more processors 102 and 202. The one or more transceivers 106 and 206 may convert the user data, control information, radio signals / channels, etc., processed using the one or more processors 102 and 202 from the base band signals into the RF band signals. To this end, the one or more transceivers 106 and 206 may include (analog) oscillators and / or filters. For example, the transceivers 106 and 206 can up-convert OFDM baseband signals to a carrier frequency by their (analogy) oscillators and / or filters under the control of the processors 102 and 202 and transmit the up-converted OFDM signals at the carrier frequency. The transceivers 106 and 206 may receive OFDM signals at a carrier frequency and down-convert the OFDM signals into OFDM baseband signals by their (analogy) oscillators and / or filters under the control of the transceivers 102 and 202.

[0080] In the implementations of the present disclosure, a UE may operate as a transmitting device in uplink (UL) and as a receiving device in downlink (DL). In the implementations of the present disclosure, a BS may operate as a receiving device in UL and as a transmitting device in DL. Hereinafter, for convenience of description, it is mainly assumed that the first wireless device 100 acts as the UE, and the second wireless device 200 acts as the BS. For example, the processor(s) 102 connected to, mounted on or launched in the first wireless device 100 may be configured to perform the UE behaviour according to an implementation of the present disclosure or control the transceiver(s) 106 to perform the UE behaviour according to an implementation of the present disclosure. The processor(s) 202 connected to, mounted on or launched in the second wireless device 200 may be configured to perform the BS behaviour according to an implementation of the present disclosure or control the transceiver(s) 206 to perform the BS behaviour according to an implementation of the present disclosure.

[0081] In the present disclosure, a BS is also referred to as a node B (NB), an eNodeB B (eNB), or a gNB.

[0082] FIG. 3 shows an example of a wireless device to which implementations of the present disclosure is applied.

[0083] The wireless device may be implemented in various forms according to a use-case / service (refer to FIG. 1).

[0084] Referring to FIG. 3, wireless devices 100 and 200 may correspond to the wireless devices 100 and 200 of FIG. 2 and may be configured by various elements, components, units / portions, and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional components 140. The communication unit 110 may include a communication circuit 112 and transceiver(s) 114. For example, the communication circuit 112 may include the one or more processors 102 and 202 of FIG. 2 and / or the one or more memories 104 and 204 of FIG. 2. For example, the transceiver(s) 114 may include the one or more transceivers 106 and 206 of FIG. 2 and / or the one or more antennas 108 and 208 of FIG. 2. The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140 and controls overall operation of each of the wireless devices 100 and 200. For example, the control unit 120 may control an electric / mechanical operation of each of the wireless devices 100 and 200 based on programs / code / commands / information stored in the memory unit 130. The control unit 120 may transmit the information stored in the memory unit 130 to the exterior (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface or store, in the memory unit 130, information received through the wireless / wired interface from the exterior (e.g., other communication devices) via the communication unit 110.

[0085] The additional components 140 may be variously configured according to types of the wireless devices 100 and 200. For example, the additional components 140 may include at least one of a power unit / battery, input / output (I / O) unit (e.g., audio I / O port, video I / O port), a driving unit, and a computing unit. The wireless devices 100 and 200 may be implemented in the form of, without being limited to, the robot (100a of FIG. 1), the vehicles (100b-1 and 100b-2 of FIG. 1), the XR device (100c of FIG. 1), the hand-held device (100d of FIG. 1), the home appliance (100e of FIG. 1), the IoT device (100f of FIG. 1), a digital broadcast terminal, a hologram device, a public safety device, an MTC device, a medicine device, a FinTech device (or a finance device), a security device, a climate / environment device, the AI server / device (400 of FIG. 1), the BSs (200 of FIG. 1), a network node, etc. The wireless devices 100 and 200 may be used in a mobile or fixed place according to a use-example / service.

[0086] In FIG. 3, the entirety of the various elements, components, units / portions, and / or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface or at least a part thereof may be wirelessly connected through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be connected by wire and the control unit 120 and first units (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. Each element, component, unit / portion, and / or module within the wireless devices 100 and 200 may further include one or more elements. For example, the control unit 120 may be configured by a set of one or more processors. As an example, the control unit 120 may be configured by a set of a communication control processor, an application processor (AP), an electronic control unit (ECU), a graphical processing unit, and a memory control processor. As another example, the memory 130 may be configured by a RAM, a DRAM, a ROM, a flash memory, a volatile memory, a non-volatile memory, and / or a combination thereof.

[0087] FIG. 4 shows another example of wireless devices to which implementations of the present disclosure is applied.

[0088] Referring to FIG. 4, wireless devices 100 and 200 may correspond to the wireless devices 100 and 200 of FIG. 2 and may be configured by various elements, components, units / portions, and / or modules.

[0089] The first wireless device 100 may include at least one transceiver, such as a transceiver 106, and at least one processing chip, such as a processing chip 101. The processing chip 101 may include at least one processor, such a processor 102, and at least one memory, such as a memory 104. The memory 104 may be operably connectable to the processor 102. The memory 104 may store various types of information and / or instructions. The memory 104 may store a software code 105 which implements instructions that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the software code 105 may implement instructions that, when executed by the processor 102, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the software code 105 may control the processor 102 to perform one or more protocols. For example, the software code 105 may control the processor 102 may perform one or more layers of the radio interface protocol.

[0090] The second wireless device 200 may include at least one transceiver, such as a transceiver 206, and at least one processing chip, such as a processing chip 201. The processing chip 201 may include at least one processor, such a processor 202, and at least one memory, such as a memory 204. The memory 204 may be operably connectable to the processor 202. The memory 204 may store various types of information and / or instructions. The memory 204 may store a software code 205 which implements instructions that, when executed by the processor 202, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the software code 205 may implement instructions that, when executed by the processor 202, perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. For example, the software code 205 may control the processor 202 to perform one or more protocols. For example, the software code 205 may control the processor 202 may perform one or more layers of the radio interface protocol.

[0091] FIG. 5 shows an example of UE to which implementations of the present disclosure is applied.

[0092] Referring to FIG. 5, a UE 100 may correspond to the first wireless device 100 of FIG. 2 and / or the first wireless device 100 of FIG. 4.

[0093] A UE 100 includes a processor 102, a memory 104, a transceiver 106, one or more antennas 108, a power management module 110, a battery 1112, a display 114, a keypad 116, a subscriber identification module (SIM) card 118, a speaker 120, and a microphone 122.

[0094] The processor 102 may be configured to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. The processor 102 may be 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 in the present disclosure. Layers of the radio interface protocol may be implemented in the processor 102. The processor 102 may include ASIC, other chipset, logic circuit and / or data processing device. The processor 102 may be an application processor. The processor 102 may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), a modem (modulator and demodulator). An example of the processor 102 may be found in SNAPDRAGONTMseries of processors made by Qualcomm®, EXYNOSTMseries of processors made by Samsung®, A series of processors made by Apple®, HELIOTMseries of processors made by MediaTek®, ATOMTMseries of processors made by Intel®or a corresponding next generation processor.

[0095] The memory 104 is operatively coupled with the processor 102 and stores a variety of information to operate the processor 102. The memory 104 may include ROM, RAM, flash memory, memory card, storage medium and / or other storage device. When the embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., procedures, functions, etc.) that perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in the present disclosure. The modules can be stored in the memory 104 and executed by the processor 102. The memory 104 can be implemented within the processor 102 or external to the processor 102 in which case those can be communicatively coupled to the processor 102 via various means as is known in the art.

[0096] The transceiver 106 is operatively coupled with the processor 102, and transmits and / or receives a radio signal. The transceiver 106 includes a transmitter and a receiver. The transceiver 106 may include baseband circuitry to process radio frequency signals. The transceiver 106 controls the one or more antennas 108 to transmit and / or receive a radio signal.

[0097] The power management module 110 manages power for the processor 102 and / or the transceiver 106. The battery 112 supplies power to the power management module 110.

[0098] The display 114 outputs results processed by the processor 102. The keypad 116 receives inputs to be used by the processor 102. The keypad 16 may be shown on the display 114.

[0099] The SIM card 118 is an　integrated circuit　that is intended to　securely store the　international mobile subscriber identity　(IMSI) number and its related　key, which are used to identify and authenticate subscribers on　mobile telephony　devices (such as　mobile phones　and　computers). It is also possible to store contact information on many SIM cards.

[0100] The speaker 120 outputs sound-related results processed by the processor 102. The microphone 122 receives sound-related inputs to be used by the processor 102.

[0101] FIGS. 6 and 7 show an example of protocol stacks in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.

[0102] 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 through which control messages used to manage call by a UE and a network are transported. The user plane refers to a path through which data generated in an application layer, for example, voice data or Internet packet data are transported. Referring to FIG. 6, the user plane protocol stack may be divided into Layer 1 (i.e., a PHY layer) and Layer 2. Referring to FIG. 7, the control plane protocol stack may be divided into Layer 1 (i.e., a PHY layer), Layer 2, Layer 3 (e.g., an RRC layer), and a non-access stratum (NAS) layer. Layer 1, Layer 2 and Layer 3 are referred to as an access stratum (AS).

[0103] In the 3GPP LTE system, the Layer 2 is split into the following sublayers: MAC, RLC, and PDCP. In the 3GPP NR system, the Layer 2 is split into the following sublayers: MAC, RLC, PDCP and SDAP. The PHY layer offers to the MAC sublayer transport channels, the MAC sublayer offers to the RLC sublayer logical channels, the RLC sublayer offers to the PDCP sublayer RLC channels, the PDCP sublayer offers to the SDAP sublayer radio bearers. The SDAP sublayer offers to 5G core network quality of service (QoS) flows.

[0104] In the 3GPP NR system, the main services and functions of the MAC sublayer include: mapping between logical channels and transport channels; multiplexing / de-multiplexing of MAC SDUs belonging to one or different logical channels into / from transport blocks (TB) delivered to / from the physical layer on transport channels; scheduling information reporting; error correction through hybrid automatic repeat request (HARQ) (one HARQ entity per cell in case of carrier aggregation (CA)); priority handling between UEs by means of dynamic scheduling; priority handling between logical channels of one UE by means of logical channel prioritization; padding. A single MAC entity may support multiple numerologies, transmission timings and cells. Mapping restrictions in logical channel prioritization control which numerology(ies), cell(s), and transmission timing(s) a logical channel can use.

[0105] Different kinds of data transfer services are offered by MAC. To accommodate different kinds of data transfer services, multiple types of logical channels are defined, i.e., each supporting transfer of a particular type of information. Each logical channel type is defined by what type of information is transferred. Logical channels are classified into two groups: control channels and traffic channels. Control channels are used for the transfer of control plane information only, and traffic channels are used for the transfer of user plane information only. Broadcast control channel (BCCH) is a downlink logical channel for broadcasting system control information, paging control channel (PCCH) is a downlink logical channel that transfers paging information, system information change notifications and indications of ongoing public warning service (PWS) broadcasts, common control channel (CCCH) is a logical channel for transmitting control information between UEs and network and used for UEs having no RRC connection with the network, and dedicated control channel (DCCH) is a point-to-point bi-directional logical channel that transmits dedicated control information between a UE and the network and used by UEs having an RRC connection. Dedicated traffic channel (DTCH) is a point-to-point logical channel, dedicated to one UE, for the transfer of user information. A DTCH can exist in both uplink and downlink. In downlink, the following connections between logical channels and transport channels exist: BCCH can be mapped to broadcast channel (BCH); BCCH can be mapped to downlink shared channel (DL-SCH); PCCH can be mapped to paging channel (PCH); CCCH can be mapped to DL-SCH; DCCH can be mapped to DL-SCH; and DTCH can be mapped to DL-SCH. In uplink, the following connections between logical channels and transport channels exist: CCCH can be mapped to uplink shared channel (UL-SCH); DCCH can be mapped to UL-SCH; and DTCH can be mapped to UL-SCH.

[0106] The RLC sublayer supports three transmission modes: transparent mode (TM), unacknowledged mode (UM), and acknowledged node (AM). The RLC configuration is per logical channel with no dependency on numerologies and / or transmission durations. In the 3GPP NR system, the main services and functions of the RLC sublayer depend on the transmission mode and include: transfer of upper layer PDUs; sequence numbering independent of the one in PDCP (UM and AM); error correction through ARQ (AM only); segmentation (AM and UM) and re-segmentation (AM only) of RLC SDUs; reassembly of SDU (AM and UM); duplicate detection (AM only); RLC SDU discard (AM and UM); RLC re-establishment; protocol error detection (AM only).

[0107] In the 3GPP NR system, the main services and functions of the PDCP sublayer for the user plane include: sequence numbering; header compression and decompression using robust header compression (ROHC); transfer of user data; reordering and duplicate detection; in-order delivery; PDCP PDU routing (in case of split bearers); retransmission of PDCP SDUs; ciphering, deciphering and integrity protection; PDCP SDU discard; PDCP re-establishment and data recovery for RLC AM; PDCP status reporting for RLC AM; duplication of PDCP PDUs 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; transfer of control plane data; reordering and duplicate detection; in-order delivery; duplication of PDCP PDUs and duplicate discard indication to lower layers.

[0108] In the 3GPP NR system, the main services and functions of SDAP include: mapping between a QoS flow and a data radio bearer; marking QoS flow ID (QFI) in both DL and UL packets. A single protocol entity of SDAP is configured for each individual PDU session.

[0109] In the 3GPP NR system, the main services and functions of the RRC sublayer include: broadcast of system information related to AS and NAS; paging initiated by 5GC or NG-RAN; establishment, maintenance and release of an RRC connection between the UE and 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 control of the reporting; detection of and recovery from radio link failure; NAS message transfer to / from NAS from / to UE.

[0110] FIG. 8 shows a frame structure in a 3GPP based wireless communication system to which implementations of the present disclosure is applied.

[0111] The frame structure shown in FIG. 8 is purely exemplary and the number of subframes, the number of slots, and / or the number of symbols in a frame may be variously changed. In the 3GPP based wireless communication system, OFDM numerologies (e.g., subcarrier spacing (SCS), transmission time interval (TTI) duration) may be differently configured between a plurality of cells aggregated for one UE. For example, if a UE is configured with different SCSs for cells aggregated for the cell, an (absolute time) duration of a time resource (e.g., a subframe, a slot, or a TTI) including the same number of symbols may be different among the aggregated cells. Herein, symbols may include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbols).

[0112] Referring to FIG. 8, downlink and uplink transmissions are organized into frames. Each frame has Tf= 10ms duration. Each frame is divided into two half-frames, where each of the half-frames has 5ms duration. Each half-frame consists of 5 subframes, where the duration Tsfper subframe is 1ms. Each subframe is divided into slots and the number of slots in a subframe depends on a subcarrier spacing. Each slot includes 14 or 12 OFDM symbols based on a cyclic prefix (CP). In a normal CP, each slot includes 14 OFDM symbols and, in an extended CP, each slot includes 12 OFDM symbols. The numerology is based on exponentially scalable subcarrier spacing △f = 2u*15 kHz.

[0113] Table 1 shows the number of OFDM symbols per slot Nslotsymb, the number of slots per frameNframe,uslot, and the number of slots per subframe Nsubframe,uslotfor the normal CP, according to the subcarrier spacing △f = 2u*15 kHz.

[0114] uNslotsymbNframe,uslotNsubframe,uslot01410111420221440431480841416016

[0115] Table 2 shows the number of OFDM symbols per slot Nslotsymb, the number of slots per frameNframe,uslot, and the number of slots per subframe Nsubframe,uslotfor the extended CP, according to the subcarrier spacing △f = 2u*15 kHz.

[0116] uNslotsymbNframe,uslotNsubframe,uslot212404

[0117] A slot includes plural symbols (e.g., 14 or 12 symbols) in the time domain. For each numerology (e.g., subcarrier spacing) and carrier, a resource grid ofNsize,ugrid,x*NRBscsubcarriers andNsubframe,usymbOFDM symbols is defined, starting at common resource block (CRB)Nstart,ugridindicated by higher-layer signaling (e.g., RRC signaling), whereNsize,ugrid,xis the number of resource blocks (RBs) in the resource grid and the subscript x is DL for downlink and UL for uplink.NRBscis the number of subcarriers per RB. In the 3GPP based wireless communication system,NRBscis 12 generally. There is one resource grid for a given antenna portp, subcarrier spacing configurationu, and transmission direction (DL or UL). The carrier bandwidthNsize,ugridfor subcarrier spacing configurationuis given by the higher-layer parameter (e.g., RRC parameter). Each element in the resource grid for the antenna portpand the subcarrier spacing configurationuis referred to as a resource element (RE) and one complex symbol may be mapped to each RE. Each RE in the resource grid is uniquely identified by an indexkin the frequency domain and an indexlrepresenting a symbol location relative to a reference point in the time domain. In the 3GPP based wireless communication system, an RB is defined by 12 consecutive subcarriers in the frequency domain.

[0118] In the 3GPP NR system, RBs are classified into CRBs and physical resource blocks (PRBs). CRBs are numbered from 0 and upwards in the frequency domain for subcarrier spacing configurationu. The center of subcarrier 0 of CRB 0 for subcarrier spacing configurationucoincides with 'point A' which serves as a common reference point for resource block grids. In the 3GPP NR system, PRBs are defined within a bandwidth part (BWP) and numbered from 0 toNsizeBWP,i-1, where i is the number of the bandwidth part. The relation between the physical resource block nPRBin the bandwidth part i and the common resource block nCRBis as follows: nPRB= nCRB+NsizeBWP,i, whereNsizeBWP,iis the common resource block where bandwidth part starts relative to CRB 0. The BWP includes a plurality of consecutive RBs. A carrier may include a maximum of N (e.g., 5) BWPs. A UE may be configured with one or more BWPs on a given component carrier. Only one BWP among BWPs configured to the UE can active at a time. The active BWP defines the UE's operating bandwidth within the cell's operating bandwidth.

[0119] The NR frequency band may be defined as two types of frequency range, i.e., FR1 and FR2. The numerical value of the frequency range may be changed. For example, the frequency ranges of the two types (FR1 and FR2) may be as shown in Table 3 below. For ease of explanation, in the frequency ranges used in the NR system, FR1 may mean "sub 6 GHz range", FR2 may mean "above 6 GHz range," and may be referred to as millimeter wave (mmW).

[0120] Frequency Range designationCorresponding frequency rangeSubcarrier SpacingFR1450MHz - 6000MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0121] As mentioned above, the numerical value of the frequency range of the NR system may be changed. For example, FR1 may include a frequency band of 410MHz to 7125MHz as shown in Table 4 below. That is, FR1 may include a frequency band of 6GHz (or 5850, 5900, 5925 MHz, etc.) or more. For example, a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or more included in FR1 may include an unlicensed band. Unlicensed bands may be used for a variety of purposes, for example for communication for vehicles (e.g., autonomous driving).

[0122] Frequency Range designationCorresponding frequency rangeSubcarrier SpacingFR1410MHz - 7125MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0123] In the present disclosure, the term "cell" may refer to a geographic area to which one or more nodes provide a communication system, or refer to radio resources. A "cell" as a geographic area may be understood as coverage within which a node can provide service using a carrier and a "cell" as radio resources (e.g., time-frequency resources) is associated with bandwidth which is a frequency range configured by the carrier. The "cell" associated with the radio resources is defined by a combination of downlink resources and uplink resources, for example, a combination of a DL component carrier (CC) and a UL CC. The cell may be configured by downlink resources only, or may be configured by downlink resources and uplink resources. Since DL coverage, which is a range within which the node is capable of transmitting a valid signal, and UL coverage, which is a range within which the node is capable of receiving the valid signal from the UE, depends upon a carrier carrying the signal, the coverage of the node may be associated with coverage of the "cell" of radio resources used by the node. Accordingly, the term "cell" may be used to represent service coverage of the node sometimes, radio resources at other times, or a range that signals using the radio resources can reach with valid strength at other times.

[0124] In CA, two or more CCs are aggregated. A UE may simultaneously receive or transmit on one or multiple CCs depending on its capabilities. CA is supported for both contiguous and non-contiguous CCs. When CA is configured, the UE only has one RRC connection with the network. At RRC connection establishment / re-establishment / handover, one serving cell provides the NAS mobility information, and at RRC connection re-establishment / handover, one serving cell provides the security input. This cell is referred to as the primary cell (PCell). The PCell is a cell, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure. Depending on UE capabilities, secondary cells (SCells) can be configured to form together with the PCell a set of serving cells. An SCell is a cell providing additional radio resources on top of special cell (SpCell). The configured set of serving cells for a UE therefore always consists of one PCell and one or more SCells. For dual connectivity (DC) operation, the term SpCell refers to the PCell of the master cell group (MCG) or the primary SCell (PSCell) of the secondary cell group (SCG). An SpCell supports PUCCH transmission and contention-based random access, and is always activated. The MCG is a group of serving cells associated with a master node, comprised of the SpCell (PCell) and optionally one or more SCells. The SCG is the subset of serving cells associated with a secondary node, comprised of the PSCell and zero or more SCells, for a UE configured with DC. For a UE in RRC_CONNECTED not configured with CA / DC, there is only one serving cell comprised of the PCell. For a UE in RRC_CONNECTED configured with CA / DC, the term "serving cells" is used to denote the set of cells comprised of the SpCell(s) and all SCells. In DC, two MAC entities are configured in a UE: one for the MCG and one for the SCG.

[0125] FIG. 9 shows a data flow example in the 3GPP NR system to which implementations of the present disclosure is applied.

[0126] Referring to FIG. 9, "RB" denotes a radio bearer, and "H" denotes a header. Radio bearers are categorized into two groups: DRBs for user plane data and SRBs for control plane data. The MAC PDU is transmitted / received using radio resources through the PHY layer to / from an external device. The MAC PDU arrives to the PHY layer in the form of a transport block.

[0127] In the PHY layer, the uplink transport channels UL-SCH and RACH are mapped to their physical channels PUSCH and PRACH, respectively, and the downlink transport channels DL-SCH, BCH and PCH are mapped to PDSCH, PBCH and PDSCH, respectively. In the PHY layer, uplink control information (UCI) is mapped to PUCCH, and downlink control information (DCI) is mapped to PDCCH. A MAC PDU related to UL-SCH is transmitted by a UE via a PUSCH based on an UL grant, and a MAC PDU related to DL-SCH is transmitted by a BS via a PDSCH based on a DL assignment.

[0128] Hereinafter, technical features related to conditional reconfiguration are described. Sections of 3GPP TS 38.331 v17.2.0 may be referred.

[0129] The network configures the UE with one or more candidate target SpCells in the conditional reconfiguration. The UE evaluates the condition of each configured candidate target SpCell. The UE applies the conditional reconfiguration associated with one of the target SpCells which fulfils associated execution condition. The network provides the configuration parameters for the target SpCell in theConditionalReconfigurationIE.

[0130] In NR-DC, the UE may receive two independentconditionalReconfiguration:

[0131] - a conditionalReconfiguration associated with MCG, that is included in theRRCReconfigurationmessage received via SRB1; and

[0132] - aconditionalReconfiguration, associated with SCG, that is included in theRRCReconfigurationmessage received via SRB3, or, alternatively, included within aRRCReconfigurationmessage embedded in aRRCReconfigurationmessage received via SRB1.

[0133] In this case:

[0134] - the UE maintains two independentVarConditionalReconfig, one associated with eachconditionalReconfiguration;

[0135] - the UE independently performs all the procedures for eachconditionalReconfigurationand the associatedVarConditionalReconfig, unless explicitly stated otherwise;

[0136] - the UE performs the procedures for theVarConditionalReconfigassociated with the same cell group like themeasConfig.

[0137] The UE performs the following actions based on a receivedConditionalReconfigurationIE:

[0138] 1> if theConditionalReconfigurationcontains thecondReconfigToRemoveList:

[0139] 2> perform conditional reconfiguration removal procedure;

[0140] 1> if theConditionalReconfigurationcontains thecondReconfigToAddModList:

[0141] 2> perform conditional reconfiguration addition / modification

[0142] Conditional reconfiguration addition / modification

[0143] For eachcondReconfigIdreceived in thecondReconfigToAddModListIE the UE shall:

[0144] 1> if an entry with the matchingcondReconfigIdexists in thecondReconfigToAddModListwithin theVarConditionalReconfig:

[0145] 2> if the entry incondReconfigToAddModListincludes ancondExecutionCondorcondExecutionCondSCG;

[0146] 3> replacecondExecutionCondorcondExecutionCondSCGwithin theVarConditionalReconfigwith the value received for thiscondReconfigId;

[0147] 2> if the entry incondReconfigToAddModListincludes ancondRRCReconfig;

[0148] 3> replacecondRRCReconfigwithin theVarConditionalReconfigwith the value received for thiscondReconfigId;

[0149] 1> else:

[0150] 2> add a new entry for thiscondReconfigIdwithin theVarConditionalReconfig;

[0151] 1> perform conditional reconfiguration evaluation;

[0152] Conditional reconfiguration evaluation

[0153] The UE shall:

[0154] 1> for eachcondReconfigIdwithin theVarConditionalReconfig:

[0155] 2> if theRRCReconfigurationwithincondRRCReconfigincludes themasterCellGroupincluding thereconfigurationWithSync:

[0156] 3> consider the cell which has a physical cell identity matching the value indicated in theServingCellConfigCommonincluded in thereconfigurationWithSyncwithin themasterCellGroupin the receivedcondRRCReconfigto be applicable cell;

[0157] 2> else if theRRCReconfigurationwithincondRRCReconfigincludes thesecondaryCellGroupincluding thereconfigurationWithSync:

[0158] 3> consider the cell which has a physical cell identity matching the value indicated in theServingCellConfigCommonincluded in thereconfigurationWithSyncwithin thesecondaryCellGroupwithin the receivedcondRRCReconfigto be applicable cell;

[0159] 2> ifcondExecutionCondSCGis configured:

[0160] 3> in the remainder of the procedure, consider eachmeasIdindicated in thecondExecutionCondSCGas ameasIdin theVarMeasConfigassociated with the SCGmeasConfig;

[0161] 2> ifcondExecutionCondis configured:

[0162] 3> if it is configured via SRB3 or configured withinnr-SCGor withinnr-SecondaryCellGroupConfigvia SRB1:

[0163] 4> in the remainder of the procedure, consider eachmeasIdindicated in thecondExecutionCondas ameasIdin theVarMeasConfigassociated with the SCGmeasConfig;

[0164] 3> else:

[0165] 4> in the remainder of the procedure, consider eachmeasIdindicated in thecondExecutionCondas ameasIdin theVarMeasConfigassociated with the MCGmeasConfig;

[0166] 2> for eachmeasIdincluded in themeasIdListwithinVarMeasConfigindicated in thecondExecutionCondorcondExecutionCondSCGassociated tocondReconfigId:

[0167] 3> if thecondEventIdis associated withcondEventT1, and if the entry condition applicable for this event associated with thecondReconfigId, i.e. the event corresponding with thecondEventId(s)of the correspondingcondTriggerConfigwithinVarConditionalReconfig, is fulfilled for the applicable cell; or

[0168] 3> if thecondEventIdis associated withcondEventD1, and if the entry conditions applicable for this event associated with thecondReconfigId, i.e. the event corresponding with thecondEventId(s)of the correspondingcondTriggerConfigwithinVarConditionalReconfig, is fulfilled for the applicable cell during the correspondingtimeToTriggerdefined for this event within theVarConditionalReconfig; or

[0169] 3> if thecondEventIdis associated withcondEventA3,condEventA4orcondEventA5, and if the entry condition(s) applicable for this event associated with thecondReconfigId, i.e. the event corresponding with thecondEventId(s)of the correspondingcondTriggerConfigwithinVarConditionalReconfig, is fulfilled for the applicable cells for all measurements after layer 3 filtering taken during the correspondingtimeToTriggerdefined for this event within theVarConditionalReconfig:

[0170] 4> consider the event associated to thatmeasIdto be fulfilled;

[0171] 3> if themeasIdfor this event associated with thecondReconfigIdhas been modified; or

[0172] 3> if thecondEventIdis associated withcondEventT1, and if the leaving condition applicable for this event associated with thecondReconfigId, i.e. the event corresponding with thecondEventId(s)of the correspondingcondTriggerConfigwithinVarConditionalReconfig, is fulfilled for the applicable cell; or

[0173] 3> if thecondEventIdis associated withcondEventD1, and if the leaving condition(s) applicable for this event associated with thecondReconfigId, i.e. the event corresponding with thecondEventId(s)of the correspondingcondTriggerConfigwithinVarConditionalReconfig, is fulfilled for the applicable cell during the correspondingtimeToTriggerdefined for this event within theVarConditionalReconfig; or

[0174] 3> if thecondEventIdis associated withcondEventA3,condEventA4orcondEventA5, and if the leaving condition(s) applicable for this event associated with thecondReconfigId, i.e. the event corresponding with thecondEventId(s)of the correspondingcondTriggerConfigwithinVarConditionalReconfig, is fulfilled for the applicable cells for all measurements after layer 3 filtering taken during the correspondingtimeToTriggerdefined for this event within theVarConditionalReconfig:

[0175] 4> consider the event associated to thatmeasIdto be not fulfilled;

[0176] 2> if event(s) associated to allmeasId(s) withincondTriggerConfigfor a target candidate cell within the storedcondRRCReconfigare fulfilled:

[0177] 3> consider the target candidate cell within the storedcondRRCReconfig, associated to thatcondReconfigId, as a triggered cell;

[0178] 3> initiate the conditional reconfiguration execution;

[0179] - Up to 2MeasIdcan be configured for eachcondReconfigId.The conditional reconfiguration event of the 2MeasIdmay have the same or different event conditions, triggering quantity, time to trigger, and triggering threshold.

[0180] Conditional reconfiguration evaluation ofSNinitiated inter-SNCPC for EN-DC

[0181] The UE shall:

[0182] 1> for eachcondReconfigurationIdwithin theVarConditionalReconfiguration:

[0183] 2> for eachmeasIdincluded in themeasIdListwithinVarMeasConfigindicated in theCondReconfigExecCondSCGcontained in thetriggerConditionSNassociated to thecondReconfigurationId:

[0184] 3> if the entry condition(s) applicable for the event associated with thatmeasId, is fulfilled for the applicable cells for all measurements after layer 3 filtering taken during the correspondingtimeToTriggerdefined for this event associated with thatmeasId:

[0185] 4> consider this event to be fulfilled;

[0186] 3> if themeasIdfor this event has been modified; or

[0187] 3> if the leaving condition(s) applicable for this event associated with thatmeasId, is fulfilled for the applicable cells for all measurements after layer 3 filtering taken during the correspondingtimeToTriggerdefined for this event associated with thatmeasId:

[0188] 4> consider this event associated to thatmeasIdto be not fulfilled;

[0189] 2> if trigger conditions for all events associated with themeasId(s)indicated in theCondReconfigExecCondSCGcontained in thetriggerConditionSN, are fulfilled:

[0190] 3> consider the target cell candidate within theRRCReconfigurationmessage contained innr-SecondaryCellGroupConfigin theRRCConnectionReconfigurationmessage, contained in the storedcondReconfigurationToApply, associated to thatcondReconfigurationId, as a triggered cell;

[0191] 3> initiate the conditional reconfiguration execution;

[0192] Conditional reconfiguration execution

[0193] The UE shall:

[0194] 1> if more than one triggered cell exists:

[0195] 2> select one of the triggered cells as the selected cell for conditional reconfiguration execution;

[0196] 1> else:

[0197] 2> consider the triggered cell as the selected cell for conditional reconfiguration execution;

[0198] 1> for the selected cell of conditional reconfiguration execution:

[0199] 2> apply the storedcondRRCReconfigof the selected cell and perform the actions;

[0200] - If multiple NR cells are triggered in conditional reconfiguration execution, it is up to UE implementation which one to select, e.g. the UE considers beams and beam quality to select one of the triggered cells for execution.

[0201] SCGactivation

[0202] Upon initiating the procedure, the UE shall:

[0203] 1> if the UE is configured with an SCG after receiving the message for which this procedure is initiated:

[0204] 2> if the UE was configured with a deactivated SCG before receiving the message for which this procedure is initiated:

[0205] 3> consider the SCG to be activated;

[0206] 3> resume performing radio link monitoring on the SCG, if previously stopped;

[0207] 3> indicate to lower layers to resume beam failure detection on the PSCell, if previously stopped;

[0208] 3> indicate to lower layers that the SCG is activated.

[0209] SCGdeactivation

[0210] Upon initiating the procedure, the UE shall:

[0211] 1> consider the SCG to be deactivated;

[0212] 1> indicate to lower layers that the SCG is deactivated;

[0213] 1> ifbfd-and-RLMis configured totrue:

[0214] 2> perform radio link monitoring on the SCG;

[0215] 2> indicate to lower layers to perform beam failure detection on the PSCell;

[0216] 1> else:

[0217] 2> stop radio link monitoring on the SCG;

[0218] 2> indicate to lower layers to stop beam failure detection on the PSCell;

[0219] 2> stop timer T310 for this cell group, if running;

[0220] 2> stop timer T312 for this cell group, if running;

[0221] 2> reset the counters N310 and N311;

[0222] 1> if the UE was in RRC_CONNECTED and the SCG was activated before receiving the message for which this procedure is initiated:

[0223] 2> if SRB3 was configured before the reception of theRRCReconfigurationor of theRRCConnectionReconfigurationand SRB3 is not to be released according to anyRadioBearerConfigincluded in theRRCReconfigurationor in theRRCConnectionReconfiguration:

[0224] 3> trigger the PDCP entity of SRB3 to perform SDU discard;

[0225] 3> re-establish the RLC entity of SRB3.

[0226] SCGactivation withoutSNmessage

[0227] Upon initiating the procedure, the UE shall:

[0228] 1> if the SCG was deactivated before the reception of theRRCReconfigurationmessage or the E-UTRARRCConnectionReconfigurationmessage for which the procedure invoking this clause is executed:

[0229] 2> consider the SCG to be activated;

[0230] 2> indicate to lower layers that the SCG is activated;

[0231] 2> resume performing radio link monitoring on the SCG, if previously stopped;

[0232] 2> indicate to lower layers to resume beam failure detection on the PSCell, if previously stopped;

[0233] 2> ifbfd-and-RLMwas not configured to true before the reception of theRRCReconfigurationmessage or the E-UTRARRCConnectionReconfigurationmessage for which the procedure invoking this clause is executed; or

[0234] 2> if lower layers indicate that a Random Access procedure is needed for SCG activation:

[0235] 3> initiate the Random Access procedure on the PSCell.

[0236] Hereinafter, technical features related to cell reselection are described. Sections of 3GPP TS 38.304 v17.6.0 may be referred.

[0237] UE shall perform measurements for cell selection and reselection purposes.

[0238] When evaluating Srxlev and Squal of non-serving cells for reselection evaluation purposes, the UE shall use parameters provided by the serving cell and for the final check on cell selection criterion, the UE shall use parameters provided by the target cell for cell reselection.

[0239] The NAS can control the RAT(s) in which the cell selection should be performed, for instance by indicating RAT(s) associated with the selected PLMN, and by maintaining a list of forbidden registration area(s) and a list of equivalent PLMNs. The UE shall select a suitable cell based on RRC_IDLE or RRC_INACTIVE state measurements and cell selection criteria.

[0240] In order to expedite the cell selection process, stored information for several RATs, if available, may be used by the UE.

[0241] When camped on a cell, the UE shall regularly search for a better cell according to the cell reselection criteria. If a better cell is found, that cell is selected. The change of cell may imply a change of RAT.

[0242] The NAS is informed if the cell selection and reselection result in changes in the received system information relevant for NAS.

[0243] For normal service, the UE shall camp on a suitable cell, monitor control channel(s) of that cell so that the UE can:

[0244] - receive system information from the PLMN or SNPN; and

[0245] - receive registration area information from the PLMN or SNPN, e.g., tracking area information; and

[0246] - receive other AS and NAS Information; and

[0247] - if registered:

[0248] - receive paging and notification messages from the PLMN or SNPN; and

[0249] - initiate transfer to Connected mode.

[0250] For cell selection in multi-beam operations, measurement quantity of a cell is up to UE implementation.

[0251] For cell reselection in multi-beam operations, including inter-RAT reselection from E-UTRA to NR, the measurement quantity of this cell is derived amongst the beams corresponding to the same cell based on SS / PBCH block as follows:

[0252] - ifnrofSS-BlocksToAverage(maxRS-IndexCellQualin E-UTRA) is not configured inSIB2 / SIB4(SIB24in E-UTRA); or

[0253] - ifabsThreshSS-BlocksConsolidation(threshRS-Indexin E-UTRA)is not configured inSIB2 / SIB4(SIB24in E-UTRA); or

[0254] - if the highest beam measurement quantity value is below or equal toabsThreshSS-BlocksConsolidation(threshRS-Indexin E-UTRA):

[0255] - derive a cell measurement quantity as the highest beam measurement quantity value.

[0256] - else:

[0257] - derive a cell measurement quantity as the linear average of the power values of up tonrofSS-BlocksToAverage(maxRS-IndexCellQualin E-UTRA) of highest beam measurement quantity values aboveabsThreshSS-BlocksConsolidation(threshRS-Indexin E-UTRA).

[0258] Cell Selection process

[0259] Cell selection is performed by one of the following two procedures:

[0260] a) Initial cell selection (no prior knowledge of which RF channels are NR frequencies):

[0261] 1. The UE shall scan all RF channels in the NR bands according to its capabilities to find a suitable cell.

[0262] 2. On each frequency, the UE need only search for the strongest cell, except for operation with shared spectrum channel access where the UE may search for the next strongest cell(s).

[0263] 3. Once a suitable cell is found, this cell shall be selected.

[0264] b) Cell selection by leveraging stored information:

[0265] 1. This procedure requires stored information of frequencies and optionally also information on cell parameters from previously received measurement control information elements or from previously detected cells.

[0266] 2. Once the UE has found a suitable cell, the UE shall select it.

[0267] 3. If no suitable cell is found, the initial cell selection procedure in a) shall be started.

[0268] - Priorities between different frequencies or RATs provided to the UE by system information or dedicated signalling are not used in the cell selection process.

[0269] The cell selection criterion S is fulfilled when:

[0270] Srxlev > 0 AND Squal > 0

[0271] where:

[0272] Srxlev = Qrxlevmeas- (Qrxlevmin+ Qrxlevminoffset)- Pcompensation- Qoffsettemp

[0273] Squal = Qqualmeas- (Qqualmin+ Qqualminoffset) - Qoffsettemp

[0274] Table 5 shows parameters for cell selection criterion.

[0275] SrxlevCell selection RX level value (dB)SqualCell selection quality value (dB)QoffsettempOffset temporarily applied to a cell (dB)QrxlevmeasMeasured cell RX level value (RSRP)QqualmeasMeasured cell quality value (RSRQ)QrxlevminMinimum required RX level in the cell (dBm). If the UE supports SUL frequency for this cell, Qrxlevminis obtained from q-RxLevMinSUL, if present, in SIB1, SIB2 and SIB4, additionally, if QrxlevminoffsetcellSULis present in SIB3 and SIB4 for the concerned cell, this cell specific offset is added to the corresponding Qrxlevmin to achieve the required minimum RX level in the concerned cell;else Qrxlevminis obtained from q-RxLevMin in SIB1, SIB2 and SIB4, additionally, if Qrxlevminoffsetcellis present in SIB3 and SIB4 for the concerned cell, this cell specific offset is added to the corresponding Qrxlevmin to achieve the required minimum RX level in the concerned cell.QqualminMinimum required quality level in the cell (dB). Additionally, if Qqualminoffsetcellis signalled for the concerned cell, this cell specific offset is added to achieve the required minimum quality level in the concerned cell.QrxlevminoffsetOffset to the signalled Qrxlevmintaken into account in the Srxlev evaluation as a result of a periodic search for a higher priority PLMN while camped normally in a VPLMN.QqualminoffsetOffset to the signalled Qqualmintaken into account in the Squal evaluation as a result of a periodic search for a higher priority PLMN while camped normally in a VPLMN.PcompensationFor FR1, if the UE supports the additionalPmax in the NR-NS-PmaxList, if present, in SIB1, SIB2 and SIB4:max(PEMAX1-PPowerClass, 0) - (min(PEMAX2, PPowerClass) - min(PEMAX1, PPowerClass)) (dB);else:max(PEMAX1-PPowerClass, 0) (dB)For FR2, Pcompensationis set to 0.For IAB-MT, Pcompensationis set to 0.PEMAX1, PEMAX2Maximum TX power level of a UE may use when transmitting on the uplink in the cell (dBm) defined as PEMAX. If UE supports SUL frequency for this cell, PEMAX1and PEMAX2are obtained from the p-Max for SUL in SIB1 and NR-NS-PmaxList for SUL respectively in SIB1, SIB2 and SIB4, else PEMAX1and PEMAX2are obtained from the p-Max and NR-NS-PmaxList respectively in SIB1, SIB2 and SIB4 for normal UL.PPowerClassMaximum RF output power of the UE (dBm) according to the UE power class.

[0276] The signalled values Qrxlevminoffsetand Qqualminoffsetare only applied when a cell is evaluated for cell selection as a result of a periodic search for a higher priority PLMN while camped normally in a VPLMN. During this periodic search for higher priority PLMN, the UE may check the S criteria of a cell using parameter values stored from a different cell of this higher priority PLMN.

[0277] Reselectionpriorities handling

[0278] Absolute priorities of different NR frequencies or inter-RAT frequencies may be provided to the UE in the system information, in theRRCReleasemessage, or by inheriting from another RAT at inter-RAT cell (re)selection. In the case of system information, an NR frequency or inter-RAT frequency may be listed without providing a priority (i.e. the fieldcellReselectionPriorityis absent for that frequency). If any fields withcellReselectionPriorityornsag-CellReselectionPriorityare provided in dedicated signalling, the UE shall ignore any fields withcellReselectionPriorityandnsag-CellReselectionPriorityprovided in system information.

[0279] When UE is in camped normally state, if it supports slice-based cell reselection and has received the network slice(s) and NSAG information from NAS to be used for cell reselection, UE shall derive reselection priorities.

[0280] - UE derives reselection priorities also in caseSIB16is not broadcast in the camped cell.

[0281] If UE is incamped on any cellstate, UE shall only apply the priorities provided by system information from current cell, and the UE preserves priorities provided by dedicated signalling anddeprioritisationReqreceived inRRCReleaseunless specified otherwise. When the UE in camped normally state, has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency to be the lowest priority frequency (i.e. lower than any of the network configured values). When the HSDN capable UE is in High-mobility state, the UE shall always consider the HSDN cells to be the highest priority (i.e., higher than any other network configured priorities). When the HSDN capable UE is not in High-mobility state, the UE shall always consider HSDN cells to be the lowest priority (i.e., lower than any other network configured priorities). If the UE is configured to perform both NR sidelink communication and V2X sidelink communication, the UE may consider the frequency providing both NR sidelink communication configuration and V2X sidelink communication configuration to be the highest priority. If the UE is configured to perform NR sidelink communication and not perform V2X communication, the UE may consider the frequency providing NR sidelink communication configuration to be the highest priority. If the UE is configured to perform V2X sidelink communication and not perform NR sidelink communication, the UE may consider the frequency providing V2X sidelink communication configuration to be the highest priority.

[0282] - The frequency only providing the anchor frequency configuration should not be prioritized for V2X service during cell reselection.

[0283] - When UE is configured to perform NR sidelink communication or V2X sidelink communication performs cell reselection, it may consider the frequencies providing the intra-carrier and inter-carrier configuration have equal priority in cell reselection.

[0284] - prioritization among the frequencies which UE considers to be the highest priority frequency is left to UE implementation unless otherwise stated.

[0285] - The UE is configured to perform V2X sidelink communication or NR sidelink communication, if it has the capability and is authorized for the corresponding sidelink operation.

[0286] - When UE is configured to perform both NR sidelink communication and V2X sidelink communication, but cannot find a frequency which can provide both NR sidelink communication configuration and V2X sidelink communication configuration, UE may consider the frequency providing either NR sidelink communication configuration or V2X sidelink communication configuration to be the highest priority.

[0287] The UE shall only perform cell reselection evaluation for NR frequencies and inter-RAT frequencies that are given in system information and for which the UE has a priority provided.

[0288] If the MBS broadcast capable UE is receiving or interested to receive an MBS broadcast service(s) and can only receive this MBS broadcast service(s) by camping on a frequency on which it is provided, the UE may consider that frequency to be the highest priority during the MBS broadcast session as long as the two following conditions are fulfilled:

[0289] 1) SIB1 scheduling information of the cell reselected by the UE due to frequency prioritization for MBS contains SIB20;

[0290] 2) Either:

[0291] - One or more MBS FSAI(s) of that frequency is indicated in SIB21 of the serving cell and the same MBS FSAI(s) is also indicated for this MBS broadcast service in MBS User Service Description (USD), or

[0292] - SIB21 is not provided in the serving cell and that frequency is included in the USD of this service, or

[0293] - SIB21 is provided in the serving cell but does not provide the frequency mapping for the concerned service, and that frequency is included in the USD of this service.

[0294] - It is up to UE implementation which frequency to select, when the USD provides multiple frequencies for the service the UE is interested in.

[0295] If the MBS broadcast capable UE is receiving or interested to receive an MBS broadcast service, the UE may consider cell reselection candidate frequencies at which it cannot receive the MBS broadcast service to be of the lowest priority during the MBS broadcast session, as long as SIB1 scheduling information of the cell contains SIB20 on the MBS frequency which the UE monitors and as long as the condition 2) above is fulfilled for the serving cell.

[0296] - Example scenarios in which such down-prioritisation may be needed include the cases where camping is not possible for the UE on the MBS broadcast frequency (e.g. the MBS broadcast frequency belongs to a PLMN different from UE's registered PLMN) while the UE can receive the MBS broadcast service when camped on another frequency than the MBS broadcast frequency or current frequency.

[0297] - The frequency prioritization for MBS broadcast, NR sidelink communication, or V2X sidelink communication may override the re-selection priorities for slice-based cell reselection.

[0298] In case UE receivesRRCReleasewithdeprioritisationReq, UE shall consider current frequency and stored frequencies due to the previously receivedRRCReleasewithdeprioritisationReqor all the frequencies of NR to be the lowest priority frequency (i.e. lower than any of the network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection or SNPN selection is performed on request by NAS.

[0299] - UE should search for a higher priority layer for cell reselection as soon as possible after the change of priority. The minimum related performance requirements are still applicable.

[0300] - The UE does not consider MBS broadcast, NR sidelink communication or V2X sidelink communication functionality to replace cell reselection priorities caused by HSDN ordeprioritisationReqfunctionality.

[0301] The UE shall delete priorities provided by dedicated signalling when:

[0302] - the UE enters a different RRC state; or

[0303] - the optional validity time of dedicated priorities (T320) expires; or

[0304] - the UE receives anRRCReleasemessage with the fieldcellReselectionPrioritiesabsent; or

[0305] - a PLMN selection or SNPN selection is performed on request by NAS.

[0306] - Equal priorities between RATs are not supported.

[0307] The UE shall not consider any exclude-listed cells as candidate for cell reselection.

[0308] The UE shall consider only the allow-listed cells, if configured, as candidates for cell reselection.

[0309] The UE in RRC_IDLE state shall inherit the priorities provided by dedicated signalling and the remaining validity time (i.e. T320 in NR and E-UTRA), if configured, at inter-RAT cell (re)selection.

[0310] - The network may assign dedicated cell reselection priorities for frequencies not configured by system information.

[0311] CellReselectionevaluation process -Reselection priorities handling

[0312] Absolute priorities of different NR frequencies or inter-RAT frequencies may be provided to the UE in the system information, in theRRCReleasemessage, or by inheriting from another RAT at inter-RAT cell (re)selection. In the case of system information, an NR frequency or inter-RAT frequency may be listed without providing a priority (i.e. the fieldcellReselectionPriorityis absent for that frequency). If any fields withcellReselectionPriorityornsag-CellReselectionPriorityare provided in dedicated signalling, the UE shall ignore any fields withcellReselectionPriorityandnsag-CellReselectionPriorityprovided in system information.

[0313] When UE is in camped normally state, if it supports slice-based cell reselection and has received the network slice(s) and NSAG information from NAS to be used for cell reselection, UE shall derive reselection priorities.

[0314] - UE derives reselection priorities also in caseSIB16is not broadcast in the camped cell.

[0315] If UE is incamped on any cellstate, UE shall only apply the priorities provided by system information from current cell, and the UE preserves priorities provided by dedicated signalling anddeprioritisationReqreceived inRRCReleaseunless specified otherwise. When the UE in camped normally state, has only dedicated priorities other than for the current frequency, the UE shall consider the current frequency to be the lowest priority frequency (i.e. lower than any of the network configured values). When the HSDN capable UE is in High-mobility state, the UE shall always consider the HSDN cells to be the highest priority (i.e., higher than any other network configured priorities). When the HSDN capable UE is not in High-mobility state, the UE shall always consider HSDN cells to be the lowest priority (i.e., lower than any other network configured priorities). If the UE is configured to perform both NR sidelink communication and V2X sidelink communication, the UE may consider the frequency providing both NR sidelink communication configuration and V2X sidelink communication configuration to be the highest priority. If the UE is configured to perform NR sidelink communication and not perform V2X communication, the UE may consider the frequency providing NR sidelink communication configuration to be the highest priority. If the UE is configured to perform V2X sidelink communication and not perform NR sidelink communication, the UE may consider the frequency providing V2X sidelink communication configuration to be the highest priority.

[0316] The UE shall only perform cell reselection evaluation for NR frequencies and inter-RAT frequencies that are given in system information and for which the UE has a priority provided.

[0317] If the MBS broadcast capable UE is receiving or interested to receive an MBS broadcast service(s) and can only receive this MBS broadcast service(s) by camping on a frequency on which it is provided, the UE may consider that frequency to be the highest priority during the MBS broadcast session as long as the two following conditions are fulfilled:

[0318] 1) SIB1 scheduling information of the cell reselected by the UE due to frequency prioritization for MBS contains SIB20;

[0319] 2) Either:

[0320] - One or more MBS FSAI(s) of that frequency is indicated in SIB21 of the serving cell and the same MBS FSAI(s) is also indicated for this MBS broadcast service in MBS User Service Description (USD), or

[0321] - SIB21 is not provided in the serving cell and that frequency is included in the USD of this service, or

[0322] - SIB21 is provided in the serving cell but does not provide the frequency mapping for the concerned service, and that frequency is included in the USD of this service.

[0323] - It is up to UE implementation which frequency to select, when the USD provides multiple frequencies for the service the UE is interested in.

[0324] If the MBS broadcast capable UE is receiving or interested to receive an MBS broadcast service, the UE may consider cell reselection candidate frequencies at which it cannot receive the MBS broadcast service to be of the lowest priority during the MBS broadcast session, as long as SIB1 scheduling information of the cell contains SIB20 on the MBS frequency which the UE monitors and as long as the condition 2) above is fulfilled for the serving cell.

[0325] - Example scenarios in which such down-prioritisation may be needed include the cases where camping is not possible for the UE on the MBS broadcast frequency (e.g. the MBS broadcast frequency belongs to a PLMN different from UE's registered PLMN) while the UE can receive the MBS broadcast service when camped on another frequency than the MBS broadcast frequency or current frequency.

[0326] - The frequency prioritization for MBS broadcast, NR sidelink communication, or V2X sidelink communication may override the re-selection priorities for slice-based cell reselection.

[0327] In case UE receivesRRCReleasewithdeprioritisationReq, UE shall consider current frequency and stored frequencies due to the previously receivedRRCReleasewithdeprioritisationReqor all the frequencies of NR to be the lowest priority frequency (i.e. lower than any of the network configured values) while T325 is running irrespective of camped RAT. The UE shall delete the stored deprioritisation request(s) when a PLMN selection or SNPN selection is performed on request by NAS.

[0328] - UE should search for a higher priority layer for cell reselection as soon as possible after the change of priority. The minimum related performance requirements are still applicable.

[0329] - The UE does not consider MBS broadcast, NR sidelink communication or V2X sidelink communication functionality to replace cell reselection priorities caused by HSDN ordeprioritisationReqfunctionality.

[0330] The UE shall delete priorities provided by dedicated signalling when:

[0331] - the UE enters a different RRC state; or

[0332] - the optional validity time of dedicated priorities (T320) expires; or

[0333] - the UE receives anRRCReleasemessage with the fieldcellReselectionPrioritiesabsent; or

[0334] - a PLMN selection or SNPN selection is performed on request by NAS.

[0335] - Equal priorities between RATs are not supported.

[0336] The UE shall not consider any exclude-listed cells as candidate for cell reselection.

[0337] The UE shall consider only the allow-listed cells, if configured, as candidates for cell reselection.

[0338] The UE in RRC_IDLE state shall inherit the priorities provided by dedicated signalling and the remaining validity time (i.e. T320 in NR and E-UTRA), if configured, at inter-RAT cell (re)selection.

[0339] Intra-frequency and equal priority inter-frequency CellReselectioncriteria

[0340] The cell-ranking criterion Rsfor serving cell and Rnfor neighbouring cells is defined by:

[0341] Rs= Qmeas,s+Qhyst- Qoffsettemp

[0342] Rn= Qmeas,n-Qoffset- Qoffsettemp

[0343] Table 6 shows parameters for cell-ranking criterion.

[0344] QmeasRSRP measurement quantity used in cell reselections.QoffsetFor intra-frequency: Equals to Qoffsets,n, if Qoffsets,nis valid, otherwise this equals to zero.For inter-frequency: Equals to Qoffsets,nplus Qoffsetfrequency, if Qoffsets,nis valid, otherwise this equals to Qoffsetfrequency.QoffsettempOffset temporarily applied to a cell.

[0345] The UE shall perform ranking of all cells that fulfil the cell selection criterion S.

[0346] The cells shall be ranked according to the R criteria specified above by deriving Qmeas,nand Qmeas,sand calculating the R values using averaged RSRP results.

[0347] Camped Normally state

[0348] This state is applicable for RRC_IDLE and RRC_INACTIVE state.

[0349] When camped normally, the UE shall perform the following tasks:

[0350] - monitor the paging channel of the cell according to information broadcast inSIB1;

[0351] - monitor Short Messages transmitted with P-RNTI over DCI;

[0352] - monitor relevant System Information;

[0353] - perform necessary measurements for the cell reselection evaluation procedure;

[0354] - execute the cell reselection evaluation process on the following occasions / triggers:

[0355] 1) UE internal triggers, so as to meet performance;

[0356] 2) When information on the BCCH used for the cell reselection evaluation procedure has been modified.

[0357] 3) When the network slice(s) and / or NSAG information received from NAS changes.

[0358] Selection of cell at transition to RRC_IDLE or RRC_INACTIVE state

[0359] At reception ofRRCReleasemessage to transition the UE to RRC_IDLE or RRC_INACTIVE, UE shall attempt to camp on a suitable cell according toredirectedCarrierInfoif included in theRRCReleasemessage. If the UE cannot find a suitable cell, the UE is allowed to camp on any suitable cell of the indicated RAT. If theRRCReleasemessage does not contain theredirectedCarrierInfo,UE shall attempt to select a suitable cell on an NR carrier. If no suitable cell is found according to the above, the UE shall perform cell selection using stored information in order to find a suitable cell to camp on.

[0360] When returning to RRC_IDLE state after UE moved to RRC_CONNECTED state fromcamped on any cellstate, UE shall attempt to camp on an acceptable cell according toredirectedCarrierInfo, if included in theRRCReleasemessage. If the UE cannot find an acceptable cell, the UE is allowed to camp on any acceptable cell of the indicated RAT. If theRRCReleasemessage does not containredirectedCarrierInfoUE shall attempt to select an acceptable cell on an NR frequency. If no acceptable cell is found according to the above, the UE not in SNPN Access Mode shall continue to search for an acceptable cell of any PLMN in stateany cell selection. If no acceptable cell is found according to the above, the UE in SNPN access mode shall continue to search for an acceptable cell of any SNPN in stateany cell selection.

[0361] Any Cell Selection state

[0362] This state is applicable for RRC_IDLE and RRC_INACTIVE state. In this state, the UE shall perform cell selection process to find a suitable cell. If the cell selection process fails to find a suitable cell after a complete scan of all RATs and all frequency bands supported by the UE, the UE not in SNPN Access Mode shall attempt to find an acceptable cell of any PLMN to camp on, trying all RATs that are supported by the UE and searching first for a high-quality cell. If the cell selection process fails to find a suitable cell after a complete scan of all frequency bands supported by the UE, the UE in SNPN access mode shall attempt to find an acceptable cell of any SNPN to camp on.

[0363] The UE, which is not camped on any cell, shall stay in this state.

[0364] Camped on Any Cell state

[0365] This state is only applicable for RRC_IDLE state. In this state, the UE shall perform the following tasks:

[0366] - monitor Short Messages transmitted with P-RNTI over DCI;

[0367] - monitor relevant System Information;

[0368] - perform necessary measurements for the cell reselection evaluation procedure;

[0369] - execute the cell reselection evaluation process on the following occasions / triggers:

[0370] 1) UE internal triggers, so as to meet performance;

[0371] 2) When information on the BCCH used for the cell reselection evaluation procedure has been modified.

[0372] - regularly attempt to find a suitable cell trying all frequencies of all RATs that are supported by the UE. If a suitable cell is found, UE shall move tocamped normallystate.

[0373] - if the UE supports voice services, the UE is not in SNPN access mode, and the current cell does not support IMS emergency calls as indicated by the fieldims-EmergencySupportin SIB1, the UE shall perform cell selection / reselection to an acceptable cell that supports emergency calls in any supported RAT regardless of priorities provided in system information from current cell, if no suitable cell is found.

[0374] - if the UE supports voice services, the UE is in SNPN access mode, and the current cell does not support IMS emergency calls for any SNPN(s) as indicated by the fieldimsEmergencySupportForSNPNin SIB1, the UE shall perform cell selection / reselection to an acceptable cell of any available SNPN that supports emergency calls, if no suitable cell is found.

[0375] Hereinafter, technical features related to idle / inactive Measurements are described. Sections of 3GPP TS 38.331 v17.2.0 may be referred.

[0376] This procedure specifies the measurements to be performed and stored by a UE in RRC_IDLE and RRC_INACTIVE when it has an idle / inactive measurement configuration.

[0377] The purpose of this procedure is to update the idle / inactive measurement configuration.

[0378] The UE initiates this procedure while T331 is running and SDT procedure is not ongoing and one of the following conditions is met:

[0379] 1> upon selecting a cell when entering RRC_IDLE or RRC-INACTIVE from RRC_CONNECTED or RRC_INACTIVE; or

[0380] 1> upon update of system information (SIB4, orSIB11), e.g. due to intra-RAT cell (re)selection;

[0381] While in RRC_IDLE or RRC_INACTIVE, and T331 is running, the UE shall:

[0382] 1> ifVarMeasIdleConfigincludes neither ameasIdleCarrierListEUTRAnor ameasIdleCarrierListNRreceived from theRRCReleasemessage:

[0383] 2> if the UE supportsidleInactiveEUTRA-MeasReport:

[0384] 3> if the SIB11 includes themeasIdleConfigSIBand containsmeasIdleCarrierListEUTRA:

[0385] 4> store or replace themeasIdleCarrierListEUTRAofmeasIdleConfigSIBof SIB11 withinVarMeasIdleConfig;

[0386] 3> else:

[0387] 4> remove themeasIdleCarrierListEUTRAinVarMeasIdleConfig, if stored;

[0388] 2> if the UE supportsidleInactiveNR-MeasReport:

[0389] 3> ifSIB11includes themeasIdleConfigSIBand containsmeasIdleCarrierListNR:

[0390] 4> store or replace themeasIdleCarrierListNRofmeasIdleConfigSIBofSIB11withinVarMeasIdleConfig;

[0391] 3> else:

[0392] 4> remove themeasIdleCarrierListNRinVarMeasIdleConfig, if stored;

[0393] 1> for each entry in themeasIdleCarrierListNRwithinVarMeasIdleConfigthat does not contain anssb-MeasConfigreceived from theRRCReleasemessage:

[0394] 2> if there is an entry inmeasIdleCarrierListNRinmeasIdleConfigSIBofSIB11that has the same carrier frequency and subcarrier spacing as the entry in themeasIdleCarrierListNRwithinVarMeasIdleConfigand that containsssb-MeasConfig:

[0395] 3> delete thessb-MeasConfigof the corresponding entry in themeasIdleCarrierListNRwithinVarMeasIdleConfig;

[0396] 3> store the SSB measurement configuration fromSIB11intonrofSS-BlocksToAverage,absThreshSS-BlocksConsolidation,smtc,ssb-ToMeasure,deriveSSB-IndexFromCell, andss-RSSI-Measurementwithinssb-MeasConfigof the corresponding entry in themeasIdleCarrierListNRwithinVarMeasIdleConfig;

[0397] 2> else if there is an entry ininterFreqCarrierFreqListofSIB4with the same carrier frequency and subcarrier spacing as the entry inmeasIdleCarrierListNRwithinVarMeasIdleConfig:

[0398] 3> delete thessb-MeasConfigof the corresponding entry in themeasIdleCarrierListNRwithinVarMeasIdleConfig;

[0399] 3> store the SSB measurement configuration fromSIB4intonrofSS-BlocksToAverage,absThreshSS-BlocksConsolidation,smtc,ssb-ToMeasure,deriveSSB-IndexFromCell, andss-RSSI-Measurementwithinssb-MeasConfigof the corresponding entry in themeasIdleCarrierListNRwithinVarMeasIdleConfig;

[0400] 2> else:

[0401] 3> remove thessb-MeasConfigof the corresponding entry in themeasIdleCarrierListNRwithinVarMeasIdleConfig, if stored;

[0402] 1> perform measurements.

[0403] Performing measurements

[0404] When performing measurements on NR carriers according to this clause, the UE shall derive the cell quality and consider the beam quality to be the value of the measurement results of the concerned beam, where each result is averaged.

[0405] While in RRC_IDLE or RRC_INACTIVE, and T331 is running and SDT procedure is not ongoing, the UE shall:

[0406] 1> perform the measurements in accordance with the following:

[0407] 2> if theVarMeasIdleConfigincludes themeasIdleCarrierListEUTRAand theSIB1containsidleModeMeasurementsEUTRA:

[0408] 3> for each entry inmeasIdleCarrierListEUTRAwithinVarMeasIdleConfig:

[0409] 4> if UE supports NE-DC between the serving carrier and the carrier frequency indicated bycarrierFreqEUTRAwithin the corresponding entry:

[0410] 5> perform measurements in the carrier frequency and bandwidth indicated bycarrierFreqEUTRAandallowedMeasBandwidthwithin the corresponding entry;

[0411] 5> if thereportQuantitiesEUTRAis set torsrq:

[0412] 6> consider RSRQ as the sorting quantity;

[0413] 5> else:

[0414] 6> consider RSRP as the sorting quantity;

[0415] 5> if themeasCellListEUTRAis included:

[0416] 6> consider cells identified by each entry within themeasCellListEUTRAto be applicable for idle / inactive mode measurement reporting;

[0417] 5> else:

[0418] 6> consider up tomaxCellMeasIdlestrongest identified cells, according to the sorting quantity, to be applicable for idle / inactive measurement reporting;

[0419] 5> for all cells applicable for idle / inactive measurement reporting, derive measurement results for the measurement quantities indicated byreportQuantitiesEUTRA;

[0420] 5> store the derived measurement results as indicated byreportQuantitiesEUTRAwithin themeasReportIdleEUTRAinVarMeasIdleReportin decreasing order of the sorting quantity, i.e. the best cell is included first, as follows:

[0421] 6> ifqualityThresholdEUTRAis configured:

[0422] 7> include the measurement results from the cells applicable for idle / inactive measurement reporting whose RSRP / RSRQ measurement results are above the value(s) provided inqualityThresholdEUTRA;

[0423] 6> else:

[0424] 7> include the measurement results from all cells applicable for idle / inactive measurement reporting;

[0425] 2> if theVarMeasIdleConfigincludes themeasIdleCarrierListNRand the SIB1 containsidleModeMeasurementsNR:

[0426] 3> for each entry inmeasIdleCarrierListNRwithinVarMeasIdleConfigthat containsssb-MeasConfig:

[0427] 4> if UE supports carrier aggregation or NR-DC between serving carrier and the carrier frequency and subcarrier spacing indicated bycarrierFreqandssbSubCarrierSpacingwithin the corresponding entry:

[0428] 5> perform measurements in the carrier frequency and subcarrier spacing indicated bycarrierFreqandssbSubCarrierSpacingwithin the corresponding entry;

[0429] 5> if thereportQuantitiesis set to rsrq:

[0430] 6> consider RSRQ as the cell sorting quantity;

[0431] 5> else:

[0432] 6> consider RSRP as the cell sorting quantity;

[0433] 5> if themeasCellListNRis included:

[0434] 6> consider cells identified by each entry within themeasCellListNRto be applicable for idle / inactive measurement reporting;

[0435] 5> else:

[0436] 6> consider up tomaxCellMeasIdlestrongest identified cells, according to the sorting quantity, to be applicable for idle / inactive measurement reporting;

[0437] 5> for all cells applicable for idle / inactive measurement reporting, derive cell measurement results for the measurement quantities indicated byreportQuantities;

[0438] 5> store the derived cell measurement results as indicated byreportQuantitiesfor cells applicable for idle / inactive measurement reporting withinmeasResultsPerCarrierListIdleNRin themeasReportIdleNRinVarMeasIdleReportin decreasing order of the cell sorting quantity, i.e. the best cell is included first, as follows:

[0439] 6> ifqualityThresholdis configured:

[0440] 7> include the measurement results from the cells applicable for idle / inactive measurement reporting whose RSRP / RSRQ measurement results are above the value(s) provided inqualityThreshold;

[0441] 6> else:

[0442] 7> include the measurement results from all cells applicable for idle / inactive measurement reporting;

[0443] 5> ifbeamMeasConfigIdleis included in the associated entry inmeasIdleCarrierListNRand if UE supportsidleInactiveNR-MeasBeamReportfor the FR of the carrier frequency indicated bycarrierFreqwithin the associated entry, for each cell in the measurement results:

[0444] 6> derive beam measurements based on SS / PBCH block for each measurement quantity indicated inreportQuantityRS-Indexes;

[0445] 6> if thereportQuantityRS-Indexesis set to rsrq:

[0446] 7> consider RSRQ as the beam sorting quantity;

[0447] 6> else:

[0448] 7> consider RSRP as the beam sorting quantity;

[0449] 6> setresultsSSB-Indexesto include up tomaxNrofRS-IndexesToReportSS / PBCH block indexes in order of decreasing beam sorting quantity as follows:

[0450] 7> include the index associated to the best beam for the sorting quantity and ifabsThreshSS-BlocksConsolidationis included, the remaining beams whose sorting quantity is aboveabsThreshSS-BlocksConsolidation;

[0451] 6> if theincludeBeamMeasurementsis set totrue:

[0452] 7> include the beam measurement results as indicated byreportQuantityRS-Indexes;

[0453] 2> if, as a result of the procedure in this clause, the UE performs measurements in one or more carrier frequency indicated bymeasIdleCarrierListNRormeasIdleCarrierListEUTRA:

[0454] 3> store the cell measurement results for RSRP and RSRQ for the serving cell withinmeasResultServingCellin the measReportIdleNR inVarMeasIdleReport.

[0455] 3> if theVarMeasIdleConfigincludes themeasIdleCarrierListNRand it contains an entry withcarrierFreqset to the value of the serving frequency:

[0456] 4> ifbeamMeasConfigIdleis included in that entry, and if the UE supportsidleInactiveNR-MeasBeamReportfor the FR of the serving cell:

[0457] 5> derive beam measurements based on SS / PBCH block for each measurement quantity indicated inreportQuantityRS-Indexes;

[0458] 5> if thereportQuantityRS-Indexesis set to rsrq:

[0459] 6> consider RSRQ as the beam sorting quantity;

[0460] 5> else:

[0461] 6> consider RSRP as the beam sorting quantity;

[0462] 5> setresultsSSB-Indexesto include up tomaxNrofRS-IndexesToReportSS / PBCH block indexes in order of decreasing beam sorting quantity as follows:

[0463] 6> include the index associated to the best beam for the sorting quantity and ifabsThreshSS-BlocksConsolidationis included inSIB2of serving cell, the remaining beams whose sorting quantity is aboveabsThreshSS-BlocksConsolidation;

[0464] 5> if theincludeBeamMeasurementsis set to true:

[0465] 6> include the beam measurement results as indicated byreportQuantityRS-Indexes;

[0466] - The UE is not required to perform idle / inactive measurements on a given carrier if the SSB configuration of that carrier provided via dedicated signaling is different from the SSB configuration broadcasted in the serving cell, if any.

[0467] - WhenidleModeMeasVoiceFallbackis included in SIB5, UE may decide to measure and report idle / inactive measurements for EUTRA carrier frequencies included in SIB5 even if it does not support NE-DC between the serving carrier and the EUTRA carrier frequencies.

[0468] System information blocks

[0469] SIB2contains cell re-selection information common for intra-frequency, inter-frequency and / or inter-RAT cell re-selection (i.e. applicable for more than one type of cell re-selection but not necessarily all) as well as intra-frequency cell re-selection information other than neighbouring cell related.

[0470] Examples ofSIB2field descriptions are as below.

[0471] absThreshSS-BlocksConsolidation: Threshold for consolidation of L1 measurements per RS index. If the field is absent, the UE uses the measurement quantity.

[0472] cellEdgeEvaluation: Indicates the criteria for a UE to detect that it is not at cell edge, in order to relax measurement requirements for cell reselection.

[0473] cellEdgeEvaluationWhileStationary: Indicates the criteria for a UE to detect that it is not at cell edge while stationary, in order to relax measurement requirements for cell reselection.

[0474] combineRelaxedMeasCondition: When both lowMobilityEvalutation and cellEdgeEvalutation criteria are present in SIB2, this parameter configures the UE to fulfil both criteria in order to relax measurement requirements for cell reselection. If the field is absent, the UE is allowed to relax measurement requirements for cell reselection when either or both of the criteria are met.

[0475] combineRelaxedMeasCondition2: When both stationaryMobilityEvaluation and cellEdgeEvaluationWhileStationary criteria are present in SIB2, this parameter configures the UE to fulfil both criteria in order to relax measurement requirements for cell reselection. If the field is absent, the UE is allowed to relax measurement requirements for cell reselection when only the stationary criteria is met.

[0476] highPriorityMeasRelax: Indicates whether measurements can be relaxed on high priority frequencies. If the field is absent, the UE shall not relax measurements on high priority frequencies beyond "Thigher_priority_search" unless both low mobility and not at cell edge criteria are fulfilled.

[0477] lowMobilityEvaluation: Indicates the criteria for a UE to detect low mobility, in order to relax measurement requirements for cell reselection.

[0478] nrofSS-BlocksToAverage: Number of SS blocks to average for cell measurement derivation. If the field is absent the UE uses the measurement quantity.

[0479] relaxedMeasurement: Configuration to allow relaxation of RRM measurement requirements for cell reselection. In NTN, this field is only applicable for GSO neighbour cells.

[0480] smtc: Measurement timing configuration for intra-frequency measurement. If this field is absent, the UE assumes that SSB periodicity is 5 ms for the intra-frequnecy cells. If the field is broadcast by an NTN cell, the offset (derived from parameter periodicityAndOffset) is based on the assumption that the gNB-UE propagation delay difference between the serving cell and neighbour cells equals to 0 ms, and UE can adjust the actual offset based on the actual propagation delay difference.

[0481] smtc2-LP: Measurement timing configuration for intra-frequency neighbour cells with a Long Periodicity (LP) indicated by periodicity in smtc2-LP. The timing offset and duration are equal to the offset and duration indicated in smtc in intraFreqCellReselectionInfo. The periodicity in smtc2-LP can only be set to a value strictly larger than the periodicity in smtc in intraFreqCellReselectionInfo (e.g. if smtc indicates sf20 the Long Periodicity can only be set to sf40, sf80 or sf160, if smtc indicates sf160, smtc2-LP cannot be configured). The pci-List, if present, includes the physical cell identities of the intra-frequency neighbour cells with Long Periodicity. If smtc2-LP is absent, the UE assumes that there are no intra-frequency neighbour cells with a Long Periodicity.

[0482] ssb-ToMeasure: The set of SS blocks to be measured within the SMTC measurement duration. When the field is absent the UE measures on all SS-blocks.

[0483] stationaryMobilityEvaluation: Indicates the criteria for a UE to detect stationary mobility, in order to relax measurement requirements for cell reselection.

[0484] SIB3 contains neighbouring cell related information relevant only for intra-frequency cell re-selection. The IE includes cells with specific re-selection parameters as well as exclude-listed cells.

[0485] Examples ofSIB3field descriptions are as below.

[0486] intraFreqAllowedCellList: List of allow-listed intra-frequency neighbouring cells.

[0487] intraFreqCAG-CellList: List of intra-frequency neighbouring CAG per PLMN.

[0488] intraFreqExcludedCellList: List of exclude-listed intra-frequency neighbouring cells.

[0489] intraFreqNeighCellList: List of intra-frequency neighbouring cells with specific cell re-selection parameters. If intraFreqNeighCellList-v1610 is present, it shall contain the same number of entries, listed in the same order as in intraFreqNeighCellList (without suffix).

[0490] intraFreqNeighHSDN-CellList: List of intra-frequency neighbouring HSDN cells.

[0491] SIB4 contains information relevant for inter-frequency cell re-selection (i.e. information about other NR frequencies and inter-frequency neighbouring cells relevant for cell re-selection), which can also be used for NR idle / inactive measurements. The IE includes cell re-selection parameters common for a frequency as well as cell specific re-selection parameters.

[0492] Examples ofSIB4field descriptions are as below.

[0493] absThreshSS-BlocksConsolidation: Threshold for consolidation of L1 measurements per RS index. If the field is absent, the UE uses the measurement quantity.

[0494] frequencyBandList: Indicates the list of frequency bands for which the NR cell reselection parameters apply.

[0495] highSpeedMeasInterFreq: If the field is set to true and UE supports high speed inter-frequency IDLE / INACTIVE measurements, the UE shall apply the enhanced inter-frequency RRM requirements on the inter-frequency carrier to support high speed up to 500 km / h in RRC_IDLE / RRC_INACTIVE.

[0496] nrofSS-BlocksToAverage: Number of SS blocks to average for cell measurement derivation. If the field is absent, the UE uses the measurement quantity.

[0497] smtc: Measurement timing configuration for inter-frequency measurement. If this field is absent, the UE assumes that SSB periodicity is 5 ms in this frequency. If the field is broadcast by an NTN cell, the offset (derived from parameter periodicityAndOffset) is based on the assumption that the gNB-UE propagation delay difference between the serving cell and neighbour cells equals to 0 ms, and UE can adjust the actual offset based on the actual propagation delay difference.

[0498] ssb-PositionQCL: Indicates the QCL relation between SS / PBCH blocks for a specific neighbor cell. If provided, the cell specific value overwrites the common value signalled by ssb-PositionQCL-Common in SIB4 for the indicated cell.

[0499] ssb-PositionQCL-Common: Indicates the QCL relation between SS / PBCH blocks for inter-frequency neighbor cells.

[0500] ssb-ToMeasure: The set of SS blocks to be measured within the SMTC measurement duration. When the field is absent the UE measures on all SS-blocks.

[0501] ssbSubcarrierSpacing: Subcarrier spacing of SSB. Only the following values are applicable depending on the used frequency: FR1 (15 or 30 kHz), FR2-1 (120 or 240 kHz), FR2-2 (120, 480, or 960 kHz)

[0502] Meanwhile, while UE in RRC_IDLE / INACTIVE is allowed to reselect only the pre-configured target cell, e.g., while performing the pre-configured condition-based cell reselection, the UE does not need to measure neighbour cells except for the pre-configured target cell.

[0503] However, UE in RRC_IDLE / INACTIVE is required to measure inter-frequencies / neighbour cells indicated in SIB4 for cell reselection. It causes unnecessary UE power consumption to measure neighbour cells that the UE cannot reselect.

[0504] Therefore, studies for measurements for cell reselection based on stored configuration are required.

[0505] Hereinafter, a method for measurements for cell reselection based on stored configuration, according to some embodiments of the present disclosure, will be described with reference to the following drawings.

[0506] The following drawings are created to explain specific embodiments of the present disclosure. The names of the specific devices or the names of the specific signals / messages / fields shown in the drawings are provided by way of example, and thus the technical features of the present disclosure are not limited to the specific names used in the following drawings. Herein, a wireless device may be referred to as a user equipment (UE).

[0507] FIG. 10 shows an example of a method for measurements for cell reselection based on stored configuration, according to some embodiments of the present disclosure.

[0508] In particular, FIG. 10 shows an example of a method performed by a wireless device in a wireless communication system.

[0509] In step S1001, the wireless device may receive, from a network, a conditional mobility configuration including (i) information related to a pre-configured condition related to a target cell and (ii) information related to validity of the pre-configured condition.

[0510] For example, the wireless device may receive the conditional mobility configuration while in an RRC_CONNECTED state.

[0511] In step S1002, the wireless device may enter a radio resource control (RRC)_IDLE state or an RRC_INACTIVE state.

[0512] For example, the wireless device may select a serving cell upon entering the RRC_IDLE state or the RRC_INACTIVE state.

[0513] For example, the wireless device may determine whether the pre-configured condition is valid or not.

[0514] For example, the wireless device may start a validity timer for the pre-configured condition. For example, the wireless device may start the validity timer for the pre-configured condition upon entering the RRC_IDLE state or the RRC_INACTIVE state. For example, the wireless device may start the validity timer for the pre-configured condition upon receiving information related to the validity timer.

[0515] For example, the wireless device may determine that the pre-configured condition is valid, while the validity timer is running. For example, the wireless device may determine that the pre-configured condition is not valid, upon expiry of the validity timer.

[0516] For example, the wireless device may configure a validity area for the pre-configured condition. For example, the wireless device may determine that the pre-configured condition is valid based on the wireless device being in the validity area. For example, the wireless device may determine that the pre-configured condition is not valid when the wireless device is not in the validity area.

[0517] In step S1003, while the pre-configured condition is valid, the wireless device may perform measurements only for a serving cell and the target cell and reselect the target cell, based on the pre-configured condition being met.

[0518] For example, while the pre-configured condition is valid, the wireless device skip measurements for at least one neighbour cell other than the serving cell and the target cell.

[0519] For example, while the pre-configured condition is not valid, the wireless device may performing measurements for at least one neighbour cell, the serving cell, and the target cell. For example, while the pre-configured condition is not valid, the wireless device may perform a cell reselection procedure based on cell reselection criteria and measurements results for the at least one neighbour cell, the serving cell, and the target cell.

[0520] For example, the wireless device may receive, from the network, information related to the cell reselection criteria via a system information message. For example, the wireless device may perform a normal cell reselection procedure based on the cell reselection criteria, when the pre-configured condition is not valid.

[0521] According to some embodiments of the present disclosure, the wireless device may be in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.

[0522] Hereinafter, technical features for cell reselection based on stored configuration are described.

[0523] Preconfiguredcondition based cellreselection:

[0524] UE in RRC_IDLE / INACTIVE performs cell reselection to a target cell, if a pre-configured reselection condition associated with the target cell is met.

[0525] The pre-configured reselection condition includes at least a neighbour cell (=target cell) quality, e.g., a neighbour cell quality is better than serving cell quality. The neighbour / serving cell quality is the measurement results of the neighbour / serving cell, e.g., RSRP, RSRQ or SINR.

[0526] More than one pre-configured reselection conditions can be associated with a target cell. In this case, UE performs cell reselection to the target cell if one of pre-configured reselection conditions associated with the target cell is met. Alternatively, UE performs cell reselection to the target cell if all pre-configured reselection conditions associated with the target cell are met.

[0527] The information on target cell and the pre-configured reselection condition associated with the target cell can be transmitted via broadcast signalling, e.g., via system information.

[0528] The information on target cell and the pre-configured reselection condition associated with the target cell can be transmitted via dedicated signalling, e.g., via RRC release message.

[0529] The information on target cell may include the cell identity and frequency of the target cell.

[0530] Reusing the execution condition configured for RRC_CONNECTED mobility:

[0531] The execution condition and the information on target cell configured for conditional RRC_CONNECTED mobility, e.g., conditional RRC reconfiguration, conditional handover, or conditional LTM, can be used for the preconfigured condition-based cell reselection.

[0532] If UE is configured to use a configuration on the conditional RRC_CONNECTED mobility for preconfigured-condition-based cell reselection, UE uses the execution condition included in the configuration on the conditional RRC_CONNECTED mobility as pre-configured reselection condition in RRC_IDLE / INACTIVE. That is, if the execution condition is met, UE in RRC_IDLE / INACTIVE performs cell reselection to the target cell associated with the execution condition.

[0533] The first indicator can be configured by network, which is associated with a configuration on the conditional RRC_CONNECTED mobility.

[0534] If the first indicator is present or set to a first value, UE in RRC_IDLE / INACTIVE evaluates an execution condition associated with the first indicator, and performs cell reselection to the target cell associated with the execution condition when the execution condition is met.

[0535] If the first indicator is absent or set to a second value, UE in RRC_IDLE / INACTIVE does not evaluate the execution condition associated with the first indicator.

[0536] The second indicator can be configured by network, e.g., when the RRC connection is released or suspended.

[0537] In cast that the second indicator is used along with the first indicator, the first indicator indicates whether each configuration on the conditional RRC_CONNECTED mobility is valid in RRC_IDLE / INACTIVE for cell reselection.

[0538] If the second indicator is present or set to a first value, UE in RRC_IDLE / INACTIVE evaluates an execution condition included in the valid configuration on the conditional RRC_CONNECTED mobility, and performs cell reselection to the target cell associated with the execution condition when the execution condition is met.

[0539] If the second indicator is absent or set to a second value, UE in RRC_IDLE / INACTIVE does not evaluate any execution condition.

[0540] Validity of conditional cellreselection:

[0541] A validity timer can be configured per pre-configured reselection condition. UE starts the validity timer upon entering RRC_IDLE / INACTIVE, or receiving the validity timer from network. While a validity timer is running, if the pre-configured reselection condition associated with the validity timer is met, the UE performs cell reselection to the target cell associated with the pre-configured reselection condition. When the validity timer expires, UE does not use the corresponding pre-configured reselection condition for cell reselection.

[0542] A validity area can be configured per pre-configured reselection condition. While UE is within the valid area, if the pre-configured reselection condition is met, the UE performs cell reselection to the target cell associated with the pre-configured reselection condition. When UE is outside the valid area, UE does not use the corresponding pre-configured reselection condition for cell reselection.

[0543] If UE has a valid pre-configured reselection condition, UE performs the evaluation of the pre-configured reselection condition, i.e., whether the pre-configured reselection condition is met or not.

[0544] Coexistence with legacy cellreselection:

[0545] Alt1: UE in RRC_IDLE / INACTIVE can be in two different states. The first one is preconfigured condition-based cell reselection state. In this state, UE performs the preconfigured condition-based cell reselection and does not perform the normal cell reselection. The normal cell reselection is the cell reselection procedure, which is performed based on cell-ranking criterion and reselection priorities. The second state is normal cell reselection state. In the cell reselection state, UE performs the normal cell reselection and does not perform the conditional cell reselection.

[0546] UE in RRC_IDLE / INACTIVE changes the state depending on the validity timer or validity area configured by network. If the validity timer is running, or if the UE is within the validity area, the UE is in the preconfigured condition-based cell reselection state. If the validity timer is not running, or if the UE is outside the validity area, the UE is in the normal cell reselection state.

[0547] Alt2: Even while evaluating the pre-configured reselection condition, the UE also performs the normal cell reselection procedure.

[0548] FIG. 11 shows an example of a preconfigured condition based cell reselection.

[0549] In step S1101, a UE in RRC_CONNECTED receives the conditional LTM configuration from cell 0. For LTM target cells, i.e., cell 1 and cell2, the execution conditions are configured as follows:

[0550] - Condition #1: Target cell becomes better than serving cell.

[0551] - Condition #2: Target cell becomes better than threshold.

[0552] UE performs the evaluation of the condition #1 and #2 for cell 1 and cell2, respectively.

[0553] In step S1102, the condition #1 is met, i.e., the measurement results of cell 1 becomes higher than that of serving cell, so the UE performs handover to cell 1.

[0554] In step S1103, the UE receives RRC release message with suspend configuration, and enters RRC_INACTIVE state. The RRC release message also indicates that the LTM execution condition can be used for the preconfigured condition-based cell reselection in RRC_INACTIVE.

[0555] In step S1104, the condition #2 is met, i.e., the measurement results of cell 2 becomes higher than threshold, so the UE performs cell reselection to cell 2.

[0556] Hereinafter, technical features for measurement rule for preconfigured condition based cell reselection are described.

[0557] While performing the preconfigured condition-based cell reselection, if an UE in RRC_IDLE / INACTIVE is not required to perform the normal cell reselection, the UE performs the measurements according to the preconfigured condition.

[0558] If UE performs the measurements according to the preconfigured condition, this means the UE performs measurements on only serving cell and target cell associated with the preconfigured condition.

[0559] If UE performs the measurements according to the preconfigured condition, this means the UE performs measurements on only serving frequency and neighbour frequency associated with the preconfigured condition.

[0560] If UE performs the measurements according to the preconfigured condition, this means the UE derives the RSRP, RSRQ or SINR measurement results per cell as per 5.5.3.3. in TS38.331.

[0561] If UE performs the measurements according to the preconfigured condition, this means the UE performs measurements according to the measurement requirements for connected mode.

[0562] While performing the preconfigured condition-based cell reselection, the UE is not required to maintain valid system information related to the measurements, e.g., SIB2, 3, 4, or 5.

[0563] While performing the normal cell reselection, UE in RRC_IDLE / INACTIVE performs the measurements according to the measurement configuration transmitted via system information, e.g., SIB2, 3, 4, or 5.

[0564] If UE performs the measurements according to the measurement configuration transmitted via system information, this means the UE performs measurement on inter-frequency indicated in SIB4 and intra-frequency.

[0565] If UE performs the measurements according to the measurement configuration transmitted via system information, this means the UE performs ranking of all cells that fulfil the cell selection criterion S.

[0566] Validity of thepreconfiguredcondition for cellreselection

[0567] UE determines whether to perform the preconfigured condition-based cell reselection or the normal cell reselection based on the validity of the preconfigured condition.

[0568] A validity timer can be configured per pre-configured reselection condition. UE starts the validity timer upon entering RRC_IDLE / INACTIVE, or receiving the validity timer from network. While a validity timer is running, if the pre-configured reselection condition associated with the validity timer is met, the UE performs cell reselection to the target cell associated with the pre-configured reselection condition. After the validity timer expires, UE performs the normal cell reselection procedure.

[0569] A validity area can be configured per pre-configured reselection condition. While UE is within the valid area, if the pre-configured reselection condition is met, the UE performs cell reselection to the target cell associated with the pre-configured reselection condition. When UE is outside the valid area, UE performs the normal cell reselection procedure.

[0570] If UE is not configured to perform the preconfigured condition-based cell reselection by network, UE performs the normal cell reselection.

[0571] FIG. 12 shows an example of a measurement rule for preconfigured condition based cell reselection.

[0572] In step S1201, a UE in RRC_CONNECTED receives a cell reselection configuration which includes the preconfigured condition for target cell 1, 2, 3, and 4. The target cell 1 and 2 is operated on frequency A while the target cell 3 and 4 are operated on frequency B.

[0573] - Target cell ID: 1, frequency: A, Condition: Neighbour cell becomes better than serving cell.

[0574] - Target cell ID: 2, frequency: A, Condition: Neighbour cell becomes better than threshold.

[0575] - Target cell ID: 3, frequency: B, Condition: Neighbour cell becomes better than serving cell.

[0576] - Target cell ID: 4, frequency: B, Condition: Neighbour cell becomes better than threshold.

[0577] The cell reselection configuration also indicates the validity area:

[0578] - Validity area: cell 1, 2, and 3.

[0579] In step S1202, the UE enters RRC_INACTIVE state, and camps on cell 1.

[0580] In step S1203, the current serving cell, i.e., cell 1, is included in the validity area, and the UE considers it is within the validity area. Therefore, the UE performs the preconfigured condition-based cell reselection, and performs measurements on only serving cell and target cell 2, 3, and 4.

[0581] In step S1204, the condition configured for cell 4 is met, and the UE reselects cell 4. Since cell 4 is out of validity area, the UE performs the normal cell reselection procedure and performs measurements according to IDLE / INACTIVE measurement configuration transmitted via SIB2, 3, and 4.

[0582] FIG. 13 shows an example of a measurement rule for preconfigured condition based cell reselection.

[0583] In step S1301, a wireless device may enter into an RRC_IDLE state or an RRC_INACTIVE state.

[0584] In step S1302, the wireless device may determine whether the preconfigured condition is valid or not.

[0585] In step S1303, based on the preconfigured condition being valid, the wireless device may perform the preconfigured condition based cell reselection. The wireless device may perform measurements according to the preconfigured condition.

[0586] In step S1304, based on the preconfigured condition being not valid, the wireless device may perform the normal cell reselection. The wireless device may perform measurements according to the related system information.

[0587] FIG. 14 shows an example of a measurement rule for preconfigured condition based cell reselection.

[0588] In particular, FIG. 14 shows an example of a method performed by a wireless device in a wireless communication system.

[0589] In step S1401, a wireless device may receive a conditional cell reselection configuration indicating a preconfigured condition and a target cell associated with the preconfigured condition.

[0590] In step S1402, a wireless device may receive a validity condition of the conditional cell reselection configuration.

[0591] In step S1403, a wireless device may determine, based on the validity condition of the conditional cell reselection configuration, whether to perform the normal cell reselection or preconfigured condition-based cell reselection.

[0592] In step S1404, a wireless device may perform measurements according to the measurement configuration transmitted via system information, while performing the normal cell reselection.

[0593] In step S1405, a wireless device may perform measurements according to the conditional cell reselection configuration, while performing the preconfigured condition-based cell reselection.

[0594] Some of the detailed steps shown in the examples of FIGS. 10 - 14 may not be essential steps and may be omitted. In addition to the steps shown in FIGS. 10 - 14, other steps may be added, and the order of the steps may vary. Some of the above steps may have their own technical meaning.

[0595] Hereinafter, an apparatus for measurements for cell reselection based on stored configuration, according to some embodiments of the present disclosure, will be described. Herein, the apparatus may be a wireless device (100 or 200) in FIGS. 2, 3, 5, and 10.

[0596] For example, a wireless device may perform methods described above. The detailed description overlapping with the above-described contents could be simplified or omitted.

[0597] Referring to FIG. 5, a wireless device 100 may include a processor 102, a memory 104, and a transceiver 106.

[0598] According to some embodiments of the present disclosure, the processor 102 may be configured to be coupled operably with the memory 104 and the transceiver 106.

[0599] For example, the wireless device may include at least one transceiver, at least one processor, and at least one memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations.

[0600] The operations comprise: receiving, from a network, a conditional mobility configuration including (i) information related to a pre-configured condition related to a target cell and (ii) information related to validity of the pre-configured condition; and entering a radio resource control (RRC)_IDLE state or an RRC_INACTIVE state; while the pre-configured condition is valid: performing measurements only for a serving cell and the target cell; and reselecting the target cell, based on the pre-configured condition being met.

[0601] For example, the operations further comprise: while the pre-configured condition is valid: skipping measurements for at least one neighbour cell other than the serving cell and the target cell.

[0602] For example, the operations further comprise: while the pre-configured condition is not valid: performing measurements for at least one neighbour cell, the serving cell, and the target cell.

[0603] For example, the operations further comprise: while the pre-configured condition is not valid: performing a cell reselection procedure based on cell reselection criteria and measurements results for the at least one neighbour cell, the serving cell, and the target cell.

[0604] For example, the operations further comprise: receiving, from the network, information related to the cell reselection criteria via a system information message.

[0605] For example, the operations further comprise: determining whether the pre-configured condition is valid or not.

[0606] For example, the operations further comprise: starting a validity timer for the pre-configured condition. For example, it is determined that the pre-configured condition is valid, while the validity timer is running.

[0607] For example, the operations further comprise: configuring a validity area for the pre-configured condition. For example, it is determined that the pre-configured condition is valid based on the wireless device being in the validity area.

[0608] For example, the conditional mobility configuration is received while the wireless device is in an RRC_CONNECTED state.

[0609] For example, the operations further comprise: selecting a serving cell upon entering the RRC_IDLE state or the RRC_INACTIVE state.

[0610] For example, the processor may be adapted to be in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.

[0611] Hereinafter, a processor for a wireless device for measurements for cell reselection based on stored configuration, according to some embodiments of the present disclosure, will be described.

[0612] The processor may be adapted to control the wireless device to perform operations.

[0613] The operations comprise: receiving, from a network, a conditional mobility configuration including (i) information related to a pre-configured condition related to a target cell and (ii) information related to validity of the pre-configured condition; and entering a radio resource control (RRC)_IDLE state or an RRC_INACTIVE state; while the pre-configured condition is valid: performing measurements only for a serving cell and the target cell; and reselecting the target cell, based on the pre-configured condition being met.

[0614] For example, the operations further comprise: while the pre-configured condition is valid: skipping measurements for at least one neighbour cell other than the serving cell and the target cell.

[0615] For example, the operations further comprise: while the pre-configured condition is not valid: performing measurements for at least one neighbour cell, the serving cell, and the target cell.

[0616] For example, the operations further comprise: while the pre-configured condition is not valid: performing a cell reselection procedure based on cell reselection criteria and measurements results for the at least one neighbour cell, the serving cell, and the target cell.

[0617] For example, the operations further comprise: receiving, from the network, information related to the cell reselection criteria via a system information message.

[0618] For example, the operations further comprise: determining whether the pre-configured condition is valid or not.

[0619] For example, the operations further comprise: starting a validity timer for the pre-configured condition. For example, it is determined that the pre-configured condition is valid, while the validity timer is running.

[0620] For example, the operations further comprise: configuring a validity area for the pre-configured condition. For example, it is determined that the pre-configured condition is valid based on the wireless device being in the validity area.

[0621] For example, the conditional mobility configuration is received while the wireless device is in an RRC_CONNECTED state.

[0622] For example, the operations further comprise: selecting a serving cell upon entering the RRC_IDLE state or the RRC_INACTIVE state.

[0623] For example, the processor may be adapted to control the wireless device to be in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.

[0624] Hereinafter, a non-transitory computer-readable medium has stored thereon a plurality of instructions for measurements for cell reselection based on stored configuration, according to some embodiments of the present disclosure, will be described.

[0625] According to some embodiment of the present disclosure, the technical features of the present disclosure could be embodied directly in hardware, in a software executed by a processor, or in a combination of the two. For example, a method performed by a wireless device in a wireless communication may be implemented in hardware, software, firmware, or any combination thereof. For example, a software may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other storage medium.

[0626] Some example of storage medium is 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. The processor and the storage medium may reside in an ASIC. For another example, the processor and the storage medium may reside as discrete components.

[0627] The computer-readable medium may include a tangible and non-transitory computer-readable storage medium.

[0628] For example, non-transitory computer-readable media may include 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 any other medium that can be used to store instructions or data structures. Non-transitory computer-readable media may also include combinations of the above.

[0629] In addition, the method described herein may be realized at least in part by a computer-readable communication medium that carries or communicates code in the form of instructions or data structures and that can be accessed, read, and / or executed by a computer.

[0630] According to some embodiment of the present disclosure, a non-transitory computer-readable medium has stored thereon a plurality of instructions. The stored a plurality of instructions may be executed by a processor of a wireless device. The stored a plurality of instructions may cause the wireless device to perform operations.

[0631] The operations comprise: receiving, from a network, a conditional mobility configuration including (i) information related to a pre-configured condition related to a target cell and (ii) information related to validity of the pre-configured condition; and entering a radio resource control (RRC)_IDLE state or an RRC_INACTIVE state; while the pre-configured condition is valid: performing measurements only for a serving cell and the target cell; and reselecting the target cell, based on the pre-configured condition being met.

[0632] For example, the operations further comprise: while the pre-configured condition is valid: skipping measurements for at least one neighbour cell other than the serving cell and the target cell.

[0633] For example, the operations further comprise: while the pre-configured condition is not valid: performing measurements for at least one neighbour cell, the serving cell, and the target cell.

[0634] For example, the operations further comprise: while the pre-configured condition is not valid: performing a cell reselection procedure based on cell reselection criteria and measurements results for the at least one neighbour cell, the serving cell, and the target cell.

[0635] For example, the operations further comprise: receiving, from the network, information related to the cell reselection criteria via a system information message.

[0636] For example, the operations further comprise: determining whether the pre-configured condition is valid or not.

[0637] For example, the operations further comprise: starting a validity timer for the pre-configured condition. For example, it is determined that the pre-configured condition is valid, while the validity timer is running.

[0638] For example, the operations further comprise: configuring a validity area for the pre-configured condition. For example, it is determined that the pre-configured condition is valid based on the wireless device being in the validity area.

[0639] For example, the conditional mobility configuration is received while the wireless device is in an RRC_CONNECTED state.

[0640] For example, the operations further comprise: selecting a serving cell upon entering the RRC_IDLE state or the RRC_INACTIVE state.

[0641] For example, the stored a plurality of instructions may cause the wireless device to be in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.

[0642] Hereinafter, a method performed by a base station (BS) for measurements for cell reselection based on stored configuration, according to some embodiments of the present disclosure, will be described.

[0643] The method comprises: transmitting, by a network to a wireless device, a conditional mobility configuration including (i) information related to a pre-configured condition related to a target cell and (ii) information related to validity of the pre-configured condition. For example, the wireless device enters a radio resource control (RRC)_IDLE state or an RRC_INACTIVE state. For example, while the pre-configured condition is valid, the wireless device performs measurements only for a serving cell and the target cell, and reselects the target cell, based on the pre-configured condition being met.

[0644] Hereinafter, a base station (BS) for measurements for cell reselection based on stored configuration, according to some embodiments of the present disclosure, will be described.

[0645] The BS may include a transceiver, a memory, and a processor operatively coupled to the transceiver and the memory.

[0646] The processor may be adapted to control the transceiver to transmit, to a wireless device, a conditional mobility configuration including (i) information related to a pre-configured condition related to a target cell and (ii) information related to validity of the pre-configured condition. For example, the wireless device enters a radio resource control (RRC)_IDLE state or an RRC_INACTIVE state. For example, while the pre-configured condition is valid, the wireless device performs measurements only for a serving cell and the target cell, and reselects the target cell, based on the pre-configured condition being met.

[0647] The present disclosure can have various advantageous effects.

[0648] According to some embodiments of the present disclosure, the wireless device could efficiently perform measurements for cell reselection based on stored configuration.

[0649] For example, UE in RRC_IDLE / INACTIVE performs measurements according to SIB2, 3, 4, and 5 for cell reselection procedure. That is, UE should measure inter-frequencies indicated in SIB4. However, if UE in RRC_IDLE / INACTIVE can reselect only the target cell associated with the pre-configured condition, the UE doesn't need to measure neighbour frequencies / cells indicated in SIB4 except for target cells associated preconfigured conditions.

[0650] While performing the preconfigured condition-based cell reselection, if the UE is not required to perform the normal cell reselection procedure, the UE can save its power by not performing the measurements on inter-frequencies / neighbour cells indicated in SIB4.

[0651] In other words, a wireless device can save power by reducing measurements for neighbour cells in the inactive state or the idle state.

[0652] According to some embodiments of the present disclosure, the wireless communication system could provide an efficient solution for measurements for cell reselection based on stored configuration.

[0653] Advantageous effects which can be obtained through specific embodiments of the present disclosure are not limited to the advantageous effects listed above. For example, there may be a variety of technical effects that a person having ordinary skill in the related art can understand and / or derive from the present disclosure. Accordingly, the specific effects of the present disclosure are not limited to those explicitly described herein, but may include various effects that may be understood or derived from the technical features of the present disclosure.

[0654] Claims in the present disclosure can be combined in a various way. For instance, technical features in method claims of the present disclosure can be combined to be implemented or performed in an apparatus, and technical features in apparatus claims can be combined to be implemented or performed in a method. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in an apparatus. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in a method. Other implementations are within the scope of the following claims.

Claims

1.A method, comprising:receiving, by a wireless device from a network, a conditional mobility configuration including (i) information related to a pre-configured condition related to a target cell and (ii) information related to validity of the pre-configured condition; andentering, by the wireless device, a radio resource control (RRC)_IDLE state or an RRC_INACTIVE state;while the pre-configured condition is valid:- performing, by the wireless device, measurements only for a serving cell and the target cell; and- reselecting, by the wireless device, the target cell, based on the pre-configured condition being met.2.The method of claim 1, wherein the method further comprising:while the pre-configured condition is valid:- skipping, by the wireless device, measurements for at least one neighbour cell other than the serving cell and the target cell.3.The method of claim 1, wherein the method further comprising:while the pre-configured condition is not valid:- performing, by the wireless device, measurements for at least one neighbour cell, the serving cell, and the target cell.4.The method of claim 3, wherein the method further comprising:while the pre-configured condition is not valid:- performing, by the wireless device, a cell reselection procedure based on cell reselection criteria and measurements results for the at least one neighbour cell, the serving cell, and the target cell.5.The method of claim 4, wherein the method further comprising:receiving, by the wireless device from the network, information related to the cell reselection criteria via a system information message.6.The method of claim 1, wherein the method further comprising:determining, by the wireless device, whether the pre-configured condition is valid or not.7.The method of claim 1, wherein the method further comprising:starting, by the wireless device, a validity timer for the pre-configured condition.8.The method of claim 7,wherein it is determined that the pre-configured condition is valid, while the validity timer is running.9.The method of claim 1, wherein the method further comprising:configuring, by the wireless device, a validity area for the pre-configured condition.10.The method of claim 9,wherein it is determined that the pre-configured condition is valid based on the wireless device being in the validity area.11.The method of claim 1,wherein the conditional mobility configuration is received while the wireless device is in an RRC_CONNECTED state.12.The method of claim 1, wherein the method further comprising:selecting, by the wireless device, a serving cell upon entering the RRC_IDLE state or the RRC_INACTIVE state.13.The method of claim 1,wherein the wireless device is in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.14.A wireless device, comprising:at least one transceiver;at least one processor; andat least one memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:receiving, from a network, a conditional mobility configuration including (i) information related to a pre-configured condition related to a target cell and (ii) information related to validity of the pre-configured condition; andentering a radio resource control (RRC)_IDLE state or an RRC_INACTIVE state;while the pre-configured condition is valid:- performing measurements only for a serving cell and the target cell; and- reselecting the target cell, based on the pre-configured condition being met.15.The wireless device of claim 14, wherein the operations further comprising:while the pre-configured condition is valid:- skipping measurements for at least one neighbour cell other than the serving cell and the target cell.16.The wireless device of claim 14, wherein the operations further comprising:while the pre-configured condition is not valid:- performing measurements for at least one neighbour cell, the serving cell, and the target cell.17.The wireless device of claim 16, wherein the operations further comprising:while the pre-configured condition is not valid:- performing a cell reselection procedure based on cell reselection criteria and measurements results for the at least one neighbour cell, the serving cell, and the target cell.18.The wireless device of claim 17, wherein the operations further comprising:receiving, from the network, information related to the cell reselection criteria via a system information message.19.The wireless device of claim 14, wherein the operations further comprising:determining whether the pre-configured condition is valid or not.20.The wireless device of claim 14, wherein the operations further comprising:starting a validity timer for the pre-configured condition.21.The wireless device of claim 20,wherein it is determined that the pre-configured condition is valid, while the validity timer is running.22.The wireless device of claim 14, wherein the operations further comprising:configuring a validity area for the pre-configured condition.23.The wireless device of claim 22,wherein it is determined that the pre-configured condition is valid based on the wireless device being in the validity area.24.The wireless device of claim 14,wherein the conditional mobility configuration is received while the wireless device is in an RRC_CONNECTED state.25.The wireless device of claim 14, wherein the operations further comprising:selecting a serving cell upon entering the RRC_IDLE state or the RRC_INACTIVE state.26.The wireless device of claim 14,wherein the wireless device is in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.27.A processor for a wireless device in a wireless communication system, wherein the processor is adapted to control the wireless device to perform operations comprising:receiving, from a network, a conditional mobility configuration including (i) information related to a pre-configured condition related to a target cell and (ii) information related to validity of the pre-configured condition; andentering a radio resource control (RRC)_IDLE state or an RRC_INACTIVE state;while the pre-configured condition is valid:- performing measurements only for a serving cell and the target cell; and- reselecting the target cell, based on the pre-configured condition being met.28.A non-transitory computer-readable medium having stored thereon a plurality of instructions, which, when executed by a processor of a wireless device, cause the wireless device to perform operations, the operations comprising,receiving, from a network, a conditional mobility configuration including (i) information related to a pre-configured condition related to a target cell and (ii) information related to validity of the pre-configured condition; andentering a radio resource control (RRC)_IDLE state or an RRC_INACTIVE state;while the pre-configured condition is valid:- performing measurements only for a serving cell and the target cell; and- reselecting the target cell, based on the pre-configured condition being met.29.A method, the method comprising,transmitting, by a network to a wireless device, a conditional mobility configuration including (i) information related to a pre-configured condition related to a target cell and (ii) information related to validity of the pre-configured condition,wherein the wireless device enters a radio resource control (RRC)_IDLE state or an RRC_INACTIVE state, andwherein, while the pre-configured condition is valid, the wireless device performs measurements only for a serving cell and the target cell, and reselects the target cell, based on the pre-configured condition being met.30.A base station, comprising:a transceiver;a memory; andat least one processor operatively coupled to the transceiver and the memory, and adapted to:transmit, to a wireless device, a conditional mobility configuration including (i) information related to a pre-configured condition related to a target cell and (ii) information related to validity of the pre-configured condition,wherein the wireless device enters a radio resource control (RRC)_IDLE state or an RRC_INACTIVE state, andwherein, while the pre-configured condition is valid, the wireless device performs measurements only for a serving cell and the target cell, and reselects the target cell, based on the pre-configured condition being met.

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