KR20230145075A - Method and apparatus for cell reselection in a wireless communication system - Google Patents

Abstract

This disclosure relates to cell reselection in wireless communication systems. According to an embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system includes, from a first cell, a first priority value for a frequency and a second priority value related to a slice supported by the frequency. receiving; Receiving priority control information from a second cell indicating whether to apply the second priority value to the frequency for cell reselection; determining a priority value to be applied to the frequency for cell reselection among the first priority value and the second priority value based on the priority control information; and performing the cell reselection based on the determined priority value for the frequency.

Description

Method and apparatus for cell reselection in a wireless communication system

This disclosure relates to cell reselection in wireless communication systems.

3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) is a technology to enable high-speed packet communication. Many methods have been proposed to achieve the LTE goals of reducing costs for users and operators, improving service quality, expanding coverage, and increasing system capacity. 3GPP LTE requires lower cost per bit, improved service usability, flexible use of frequency bands, simple structure, open interface, and appropriate power consumption of the terminal as high-level requirements.

Work has begun at the International Telecommunication Union (ITU) and 3GPP to develop requirements and specifications for New Radio (NR) systems. 3GPP identifies the technology components needed to successfully standardize NR in a timely manner to meet both urgent market needs and the longer-term requirements presented by the ITU Radio Communication Sector (ITU-R) International Mobile Telecommunications (IMT)-2020 process. and must be developed. Additionally, NR should be able to use any spectrum band up to at least 100 GHz, which can be used for wireless communications even in the distant future.

NR targets a single technology framework that addresses all deployment scenarios, usage scenarios, and requirements, including enhanced Mobile BroadBand (eMBB), massive Machine Type-Communications (mMTC), and Ultra-Reliable and Low Latency Communications (URLLC). do. NR must be inherently forward compatible.

For cell reselection, the UE can determine the frequency with the highest priority, and determine the highest priority cell at the highest priority frequency. Then, the UE can perform cell reselection to the highest ranked cell. To determine the highest priority frequency, slice information for one or more frequencies may be considered.

The purpose of the present disclosure is to provide a method and device for cell reselection in a wireless communication system.

Another purpose of the present disclosure is to provide a method and device for determining a frequency for cell reselection in a wireless communication system.

Another object of the present invention is to provide a method and device for determining a frequency for cell reselection based on slice information in a wireless communication system.

According to an embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system includes, from a first cell, a first priority value for a frequency and a second priority value related to a slice supported by the frequency. receiving; Receiving priority control information from a second cell indicating whether to apply the second priority value to the frequency for cell reselection; determining a priority value to be applied to the frequency for cell reselection among the first priority value and the second priority value based on the priority control information; and performing the cell reselection based on the determined priority value for the frequency.

According to an embodiment of the present disclosure, a user equipment (UE) in a wireless communication system includes a transceiver, a memory, and at least one processor functionally coupled to the transceiver and the memory, and the at least one processor includes: Control the transceiver to receive, from a first cell, a first priority value for a frequency and a second priority value associated with a slice supported by the frequency, and control the transceiver to receive the frequency for cell reselection. Receive priority control information from a second cell indicating whether to apply the second priority value to the cell, and select the cell among the first priority value and the second priority value based on the priority control information. Determine a priority value to be applied to the frequency for selection, and perform cell reselection based on the determined priority value for the frequency.

According to an embodiment of the present disclosure, a processor for user equipment (UE) in a wireless communication system is provided. The memory of the UE stores software code that implements instructions that, when executed by the processor, perform operations: from a first cell, a first priority value for a frequency and a slice supported by the frequency. receiving a second priority value associated with; Receiving priority control information from a second cell indicating whether to apply the second priority value to the frequency for cell reselection; determining a priority value to be applied to the frequency for cell reselection among the first priority value and the second priority value based on the priority control information; and performing the cell reselection based on the determined priority value for the frequency.

According to an embodiment of the present disclosure, a non-transitory computer-readable medium stores a plurality of instructions, which, when executed by a processor of a user equipment (UE), cause the UE to: from a first cell; Priority control information that receives a first priority value for a frequency and a second priority value related to a slice supported by the frequency, and informs whether to apply the second priority value to the frequency for cell reselection. Receives from a second cell, determines a priority value to be applied to the frequency for cell reselection among the first priority value and the second priority value based on the priority control information, and determines a priority value to be applied to the frequency for cell reselection. The cell reselection is performed based on the determined priority value.

According to an embodiment of the present disclosure, a method performed by a base station (BS) in a wireless communication system includes transmitting one or more synchronization signal/physical broadcast channel (SS/PBCH) blocks to a user equipment (UE). ; performing a random access procedure with the UE; And transmitting priority control information for determining a priority value to be applied to a frequency for cell reselection among the first priority value and the second priority value to the UE, wherein the first priority value is applied to the frequency and the second priority value is related to a slice supported by the frequency, and the priority control information determines whether to apply the second priority value to the frequency for cell reselection. Let me know.

According to an embodiment of the present disclosure, a base station (BS) in a wireless communication system includes a transceiver, a memory, and at least one processor functionally coupled to the transceiver and the memory, and the at least one processor includes : Control the transceiver to transmit one or more SS/PBCH (synchronization signal/physical broadcast channel) blocks to UE (user equipment), perform a random access procedure with the UE, and control the transceiver to set a first priority value. and transmit priority control information for determining a priority value to be applied to a frequency for cell reselection among the second priority values to the UE, wherein the first priority value is applied to the frequency and the first priority value is applied to the frequency. 2 The priority value is related to the slice supported by the frequency, and the priority control information informs whether to apply the second priority value to the frequency for cell reselection.

The present disclosure can have a variety of beneficial effects.

For example, each cell can control whether the UE's preference/intention for a particular slice is applicable to cell reselection, thereby increasing network controllability over the UE's camping frequency.

Advantageous effects that can be obtained through specific embodiments of the present disclosure are not limited to the above-described advantageous effects. For example, there may be various technical effects that those skilled in the 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, and may include various effects that can be understood or derived from the technical idea of the present disclosure.

Figure 1 shows examples of 5G usage scenarios to which the technical features of the present disclosure can be applied.
Figure 2 shows an example of a wireless communication system to which the technical features of the present disclosure can be applied.
Figure 3 shows an example of a wireless communication system to which the technical features of the present disclosure can be applied.
Figure 4 shows another example of a wireless communication system to which the technical features of the present disclosure can be applied.
Figure 5 shows a block diagram of a user plane protocol stack to which the technical features of the present disclosure can be applied.
Figure 6 shows a block diagram of a control plane protocol stack to which the technical features of the present disclosure can be applied.
Figure 7 illustrates a frame structure in a 3GPP-based wireless communication system.
Figure 8 illustrates an example of data flow in a 3GPP NR system.
Figure 9 shows an example of sharing a common C-plane function set between multiple core network instances.
10 shows an example of a method performed by a UE according to an embodiment of the present disclosure.
Figure 11 shows an example of a method for controlling cell reselection priority override according to an embodiment of the present disclosure.
Figure 12 shows an example of a method performed by a BS according to an embodiment of the present disclosure.
Figure 13 shows a UE implementing an embodiment of the present disclosure.
Figure 14 shows an example of a wireless communication system to which the technical features of the present disclosure can be applied.
Figure 15 shows an example of an AI device to which the technical features of the present disclosure can be applied.
Figure 16 shows an example of an AI system to which the technical features of the present disclosure can be applied.

The technical features described below can be used by communication standards by the 3rd Generation Partnership Project (3GPP) standardization organization, communication standards by the Institute of Electrical and Electronic Engineers (IEEE), etc. For example, communication standards by the 3GPP standardization organization include Long Term Evolution (LTE) and/or evolution systems of LTE. LTE's evolution system includes LTE-Advanced (LTE-A), LTE-A Pro, and/or 5G New Radio (NR). Communications standards by the IEEE standardization body include wireless local area network (WLAN) systems such as IEEE 802.11a/b/g/n/ac/ax. The above systems use various multiple access technologies such as orthogonal frequency division multiple access (OFDMA) and/or single carrier frequency division multiple access (SC-FDMA) for downlink (DL) and/or uplink (UL). . For example, only OFDMA can be used for DL and only SC-FDMAA can be used for UL. Alternatively, OFDMA and SC-FDMA can be used for DL and/or UL.

In this 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, in this disclosure, “A, B, or C” may mean “only A,” “only B,” “only C,” or “any combination of A, B, and C.”

In the present disclosure, a slash (/) or a comma (,) may mean “and/or.” For example, “A/B” can mean “A and/or B.” Accordingly, “A/B” can mean “only A,” “only B,” or “both A and B.” For example, “A, B, C” can mean “A, B, or C.”

In this disclosure, “at least one of A and B” may mean “only A,” “only B,” or “both A and B.” Additionally, in the present disclosure, the expression “at least one of A or B” or “at least one of A and/or B” may be interpreted as the same as “at least one of A and B.”

Additionally, in this disclosure, “at least one of A, B, and C” can mean “only A,” “only B,” “only C,” or “any combination of A, B, and C.” Additionally, “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.”

Additionally, parentheses used in this disclosure may mean “for example.” In detail, when parentheses are given such as “Control Information (PDCCH)”, “PDCCH” may be suggested as an example of “Control Information”. In other words, “control information” in this disclosure is not limited to “PDCCH”, and “PDCCH” may be proposed as an example of “control information.” Additionally, even if it is given as “control information (i.e., PDCCH),” “PDCCH” may be proposed as an example of “control information.”

Technical features separately described in the drawings of the present disclosure may be implemented separately or simultaneously.

Throughout the disclosure of this disclosure, the terms 'radio access network (RAN) node', 'base station', 'eNB', 'gNB' and 'cell' may be used interchangeably. Additionally, a UE may be a type of wireless device, and throughout the disclosure, the terms 'UE' and 'wireless device' may be used interchangeably.

Throughout this disclosure, the terms 'cell quality', 'signal strength', signal quality', 'channel state', 'channel quality', 'channel state/reference signal received power (RSRP)' and 'reference 'Reference signal received quality (RSRQ)' can be used interchangeably.

The following drawings were created to illustrate specific embodiments of the present disclosure. In the drawings, the names of these specific devices or the names of specific signals/messages/fields are provided by way of example, and thus the technical features of the present disclosure are not limited to the specific names in the drawings below.

Figure 1 shows examples of 5G usage scenarios to which the technical features of the present disclosure can be applied.

The 5G usage scenario shown in FIG. 1 is for illustrative purposes only, and the technical features of the present disclosure can also be applied to other 5G usage scenarios not shown in FIG. 1.

Referring to Figure 1, the three main requirement areas for 5G are (1) enhanced mobile broadband (eMBB) domain, (2) massive machine type communication (mMTC) domain, and (3) Includes the Very High Reliability and Low Latency Communication (URLLC) area. Some use cases may require multiple areas for optimization, while others may focus on only one key performance indicator (KPI). 5G will support these diverse use cases in a flexible and reliable way.

eMBB focuses on overall improvements in data rates, latency, user density, capacity and coverage of mobile broadband connections. eMBB targets a transfer rate of ~10 Gbps. eMBB goes far beyond basic mobile Internet access and covers rich, responsive work, media access and entertainment in the cloud and/or augmented reality. Data is one of the key drivers of 5G, and we may not be the first to see dedicated voice services in the 5G era. In 5G, voice is expected to be processed by applications using only the data connections provided by the communication system. The main reason for the increase in traffic is the increase in the size of content and the number of applications that require high data transfer rates. As more devices, including streaming services (audio and video), are connected to the Internet, responsive video and mobile Internet connectivity will become more common. Many of these applications require always-on connectivity to deliver real-time information and notifications to users. Cloud storage and applications are growing rapidly on mobile communication platforms, and can be applied to both work and entertainment. Cloud storage is a particular driver of growth in uplink data rates. 5G will also be used for remote working in the cloud and will require very low end-to-end latency to maintain a good user experience when contact interfaces are used. In entertainment, for example, cloud gaming and video streaming are other key factors driving increased demand for mobile broadband capacity. Entertainment is essential on smartphones and tablets everywhere, including in high mobility environments such as trains, cars and airplanes. Another use case is augmented reality for entertainment and information retrieval. Here, augmented reality requires very low latency and instantaneous amounts of data.

mMTC is designed to enable communication between low-cost, large-scale battery-powered devices and is intended to support applications such as smart metering, logistics, and field and body sensors. mMTC targets 10 years and/or 1 million devices/km2 on the battery. mMTC enables seamless integration of embedded sensors across all domains and is one of the most widely used 5G applications. By 2020, the number of Internet of Things (IoT) devices is expected to reach 20.4 billion. Industrial IoT is one area where 5G will play a key role in enabling smart cities, asset tracking, smart facilities, agriculture, and security infrastructure.

URLLC will enable devices and devices to communicate with extremely high reliability, very low latency, and high availability, making it ideal for automotive communications, industrial control, factory automation, remote surgery, smart grid, and public safety applications. URLLC targets a latency of ~1ms. URLLC includes new services that will transform industries with ultra-high reliability/low latency, such as remote control of critical infrastructure and autonomous vehicles. Levels of reliability and latency are essential for smart grid control, industrial automation, robotics, and drone control and coordination.

Next, a number of usage examples included within the triangle in FIG. 1 will be described in more detail.

5G could complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS) as a means of delivering streams with data rates ranging from hundreds of megabits per second to several gigabits per second. These high speeds may be required to deliver virtual reality (VR) and augmented reality (AR), as well as TVs with resolutions of 4K or higher (6K, 8K and beyond). VR and AR applications include the most immersive sports events. Certain applications may require special network settings. For example, in the case of VR games, gaming companies will need to integrate their core servers with the network operator's edge network servers to minimize latency.

The automotive sector is expected to become an important new driver for 5G, and has many use cases for applying mobile communications to vehicles. For example, entertainment for passengers requires both high capacity and high mobile bandwidth. This is because future users will continue to expect high-quality connections regardless of their location and speed. Another use case in the automotive sector is augmented reality dashboards. In the dark, the driver can use the augmented reality dashboard to identify objects shown through the front windows. These augmented reality dashboards display information that informs the driver about the distance and movement of objects. In the future, these wireless modules will enable communication between vehicles, information exchange between vehicles and their supporting infrastructure, and information exchange between vehicles and other connected devices (e.g. devices carried by pedestrians). Safety systems can guide drivers through different actions to drive more safely, thereby reducing the risk of accidents. The next step will be remotely controlled or autonomous vehicles. This requires highly reliable and very fast communication between different autonomous vehicles and between vehicles and infrastructure. In the future, autonomous vehicles will perform all driving activities, with drivers focusing only on traffic situations that the vehicle itself cannot discern. The technical requirements of autonomous vehicles require extremely low latency and high-speed reliability to increase traffic safety to levels unachievable by humans.

Smart cities and smart homes, called smart societies, will be embedded within a high-density wireless sensor network. A distributed network of intelligent sensors will identify conditions for keeping a city or home cost-effective and energy-efficient. A similar setup can be done for each household. Temperature sensors, window and heating controllers, burglar alarms and appliances are all connected wirelessly. Many of these sensors typically require low data rates, low power, and low cost. However, for certain types of devices, real-time high-definition (HD) video may be required for monitoring, for example.

Consumption and distribution of energy, including heat and gases, is highly distributed and requires automated control of distributed sensor networks. A smart grid interconnects these sensors using digital information and communications technologies to collect and act on information. This information can include the behavior of suppliers and consumers and allows these smart grids to increase the allocation of fuels such as electricity in terms of efficiency, reliability, economics, production sensitivity, and automated methods. This smart grid can be viewed as another sensor network with low latency.

The health sector has many application areas that can benefit from mobile communications. Communication systems may support telemedicine to provide medical care in remote locations. This can help reduce barriers due to distance and improve access to health services that are not consistently available in remote and rural areas. It is also used to save lives in urgent care and emergency situations. Mobile communications based on wireless sensor networks can provide sensors for remote monitoring and parameters such as heart rate and blood pressure.

Wireless and mobile communications are becoming increasingly important in industrial applications. Wiring costs for installation and maintenance are high. Therefore, the possibility of replacing cables with reconfigurable wireless links is attractive to many industries. However, to achieve this, wireless connections need to operate with similar latency, reliability, and capacity as cables, and their management is simplified. Low latency and very low error probability are the new requirements for 5G connectivity.

Logistics and cargo tracking are important use cases for mobile communications, enabling tracking of inventory and packages at any time using location-based information systems. Logistics and cargo tracking use cases typically require low data rates, but require large-scale, reliable location information.

NR supports multiple numerologies (or subcarrier spacing (SCS)) to support various 5G services. For example, when SCS is 15 kHz, a wide area in the traditional cellular band can be supported. When SCS is 30 kHz/60 kHz, dense urban areas, lower latency and wider carrier bandwidth can be supported. When SCS is 60 kHz or higher, bandwidths exceeding 24.25 GHz can be supported to overcome phase noise.

The NR frequency band can be defined as two types of frequency ranges, namely FR1 and FR2. Numerical values in these frequency ranges may vary. For example, the frequency ranges of both types (FR1 and FR2) could be as shown in Table 1 below. For ease of explanation, in the frequency ranges used in NR systems, FR1 can mean "below 6 GHz range" and FR2 can mean "above 6 GHz range" and can be called millimeter waves (mmW). there is.

Frequency range specification Applicable frequency range Subcarrier spacing FR1 450MHz - 6000MHz 15, 30, 60kHz FR2 24250MHz - 52600MHz 60, 120, 240kHz

As explained above, the numerical value of the frequency range of an NR system can change. For example, FR1 may include a frequency band of 410MHz to 7125MHz as shown in Table 2 below. That is, FR1 may include a frequency band of 6GHz (or 5850, 5900, 5925 MHz, etc.) or higher. For example, the 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher frequency bands included in FR1 may include unlicensed bands. Unlicensed bands may be used for various purposes, for example, for communication in vehicles (e.g., driverless driving).

Frequency range specification Applicable frequency range Subcarrier spacing FR1 410MHz - 7125MHz 15, 30, 60kHz FR2 24250MHz - 52600MHz 60, 120, 240kHz

Figure 2 shows an example of a wireless communication system to which the technical features of the present disclosure can be applied. Referring to FIG. 2, the wireless communication system may include a first device 210 and a second device 220. The first device 210 may include a base station, a network node, a transmitting UE, a receiving UE, and a wireless Devices, wireless communication devices, vehicles, vehicles equipped with unmanned driving capabilities, connected cars, drones, unmanned vehicles (UAV), artificial intelligence (AI) modules, robots, AR devices, VR devices, mixed reality (MR) devices, Includes holographic devices, public safety devices, MTC devices, IoT devices, medical devices, fintech devices (or financial devices), security devices, climate/environment devices, devices related to 5G services, or devices related to the 4th Industrial Revolution. do.

The second device 220 is a base station, network node, transmitting UE, receiving UE, wireless device, wireless communication device, vehicle, vehicle equipped with unmanned driving function, connected car, drone, UAV, AI module, robot, AR device. , VR devices, MR devices, hologram devices, public safety devices, MTC devices, IoT devices, medical devices, fintech devices (or, financial devices), security devices, climate/environment devices, devices related to 5G services, or quaternary devices. Includes devices related to the Industrial Revolution.

For example, UE can be used in mobile phones, smartphones, laptop computers, digital broadcast terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation devices, slate personal computers (PCs), tablet PCs, ultrabooks, May include wearable devices (e.g., smartwatches, smartglasses, head-mounted displays (HMDs)). For example, such an HMD could be a head-mounted display device. For example, such HMDs can be used to implement AR, VR and/or MR.

For example, the drone may be a flying object that flies by radio control signal without a person on board. For example, the VR device may be a device that implements an object or background in a virtual world. For example, the AR device may include a device that implements a connection of objects and/or backgrounds in the virtual world to objects and/or backgrounds in the real world. For example, the MR device may include a device that implements a function of fusing objects and/or backgrounds in the virtual world with objects and/or backgrounds in the real world. For example, a holographic device may include a device that implements a 360-degree stereoscopic image by recording and reproducing three-dimensional information using an interference phenomenon called holography, which is generated by two laser lights meeting each other. For example, a public safety device may include a video relay device or a video device that a user can wear on their body. For example, MTC devices and IoT devices may be devices that do not require direct human intervention or manipulation. For example, the MTC devices and IoT devices may include smart meters, vending machines, thermometers, smart light bulbs, door locks, and/or various sensors. For example, the medical device may be a device used to diagnose, treat, alleviate, treat, or prevent disease. For example, the medical device may be a device used for the purpose of diagnosing, treating, alleviating, or correcting an injury or disease. For example, the medical device may be a device used for the purpose of examining, replacing, or modifying structure or function. For example, the medical device may be a device used for the purpose of controlling pregnancy. For example, the medical devices include therapeutic devices, surgical devices, diagnostic devices (in vitro), devices for hearing aids and/or procedures, etc. For example, a security device may be a device installed to prevent possible danger and maintain safety. For example, the security device may include a camera, closed circuit television (CCTV), recorder, or black box. For example, the fintech device may be a device that can provide financial services such as mobile payments. For example, the fintech device may include a payment device or a point of sales (POS). For example, the climate/environment device may include a device for monitoring and predicting climate/environment.

The first device 210 may include at least one or more processors such as processor 211, at least one memory such as memory 212, and at least one transceiver such as transceiver 213. The processor 211 may perform the functions, procedures, and/or methods of the first device described through the disclosure of this disclosure. The processor 211 may perform one or more protocols. For example, the processor 211 may perform one or more layers of the air interface protocol. The memory 212 is connected to the processor 211 and can store various types of information and/or instructions. The transceiver 213 is connected to the processor 211 and can be controlled by the processor 211 to transmit and receive wireless signals.

The second device 220 may include at least one or more processors such as processor 221, at least one memory such as memory 222, and at least one transceiver such as transceiver 223. The processor 221 may perform the functions, procedures, and/or methods of the second device 220 described throughout the disclosure. The processor 221 may perform one or more protocols. For example, the processor 221 may perform one or more layers of the air interface protocol. The memory 222 is connected to the processor 221 and can store various types of information and/or instructions. The transceiver 223 is connected to the processor 221 and can be controlled by the processor 221 to transmit and receive wireless signals.

The memories 212 and 222 may be internally or externally connected to the processors 211 and 212, or may be connected to other processors through various technologies such as wired or wireless connections.

The first device 210 and/or the second device 220 may have more than one antenna. For example, antenna 214 and/or antenna 224 may be configured to transmit and receive wireless signals.

Figure 3 shows an example of a wireless communication system to which the technical features of the present disclosure can be applied.

Specifically, Figure 3 shows a system architecture based on evolved-UMTS terrestrial radio access network (E-UTRAN). The LTE mentioned above is part of evolved-UTMS (e-UMTS) using NE-UTRA.

Referring to Figure 3, this wireless communication system includes one or more user equipment (UE) 310, an E-UTRAN, and an evolved packet core (EPC). The UE 310 refers to communication equipment carried by the user. The UE 310 may be a fixed device or a portable device. The UE 310 may also be called other terms such as base station (MS), user terminal (UT), subscriber station (SS), wireless device, etc.

E-UTRAN consists of one or more evolved Node B (eNB) 320. The eNB 320 provides E-UTRA user plane and control plane protocol termination to UE 10. The eNB 320 is generally a fixed station that communicates with the UE 310. The eNB 320 has functions such as inter-cell radio resource management (RRM), radio bearer (RB) control, connection mobility control, radio admission control, measurement configuration/provision, dynamic resource allocation (scheduler), etc. The eNB 320 may be called by other terms such as base station (BS), basic transceiver system (BTS), access point (AP), etc.

Downlink (DL) represents communication from eNB 320 to UE 310. Uplink (UL) represents communication from UE 310 to eNB 320. Sidelink (SL) represents communication between UEs 310. In DL, a transmitter may be part of the eNB 320 and a receiver may be part of the UE 310. In UL, a transmitter may be part of the UE 310 and a receiver may be part of the eNB 320. In SL, a transmitter and receiver may be part of the UE 310.

The EPC includes a Mobility Management Entity (MME), a Serving Gateway (S-GW) and a Packet Data Network (PDN) Gateway (P-GW). The MME has functions such as non-access stratum (NAS) security, idle state mobility handling, evolved packet system (EPS) bearer control, etc. The S-GW has functions such as mobility anchoring, etc. The S-GW is a gateway that has E-UTRAN as an endpoint. For convenience, the MME/S-GW 330 will simply be referred to as a “gateway” in this disclosure, but it should be understood that this entity includes both the MME and the S-GW. The P-GW has functions such as UE Internet Protocol (IP) address allocation, packet filtering, etc. The P-GW is a gateway that has PDN as an endpoint. The P-GW is connected to an external network.

The UE 310 is connected to the eNB 320 through the Uu interface. The UEs 310 are each connected to each other through the PC5 interface. The eNBs 320 are each interconnected through an X2 interface. The eNB 320 is also interconnected to the EPC via the S1 interface, more specifically to the MME via the S1-MME interface and to the S1-U interface, respectively. The S1 interface supports many-to-many relationships between MME/S-GW and eNB.

Figure 4 shows another example of a wireless communication system to which the technical features of the present disclosure can be applied.

Specifically, Figure 4 shows a system architecture based on 5G NR. The entity used in the 5G NR (hereinafter simply referred to as “NR”) can absorb some or all of the functions of the entities introduced in FIG. 3 (e.g., eNB, MME, S-GW). The entity used in the NR can be identified with the name “NG” to distinguish it from LTE/LTE-A.

Referring to FIG. 4, the wireless communication system includes one or more UEs 410, a next-generation RAN (NG-RAN), and a 5th generation core network (5GC). The NG-RAN consists of at least one NG-RAN node. The NG-RAN node is an entity corresponding to the eNB 320 shown in FIG. 3. The NG-RAN node consists of at least one gNB 421 and/or at least one ng-eNB 422. The gNB 421 provides NR user plane and control plane protocol endpoints to the UE 410. The ng-eNB 422 provides E-UTRA user plane and control plane protocol endpoints to the UE 410.

The 5GC includes Access and Mobility Management Function (AMF), User Plane Function (UPF) and Session Management Function (SMF). The AMF has functions such as NAS security, idle state mobility handling, etc. The AMF is an entity that includes the functions of a typical MME. The UPF has functions such as mobility anchoring and protocol data unit (PDU) handling. The UPF is an entity that includes the functions of a typical S-GW. The SMF has functions such as UE IP address allocation and PDU session control.

The gNB 421 and ng-eNB 422 are each connected to each other through an Xn interface. The gNB 421 and ng-eNB 422 are also interconnected to 5GC through an NG interface, more specifically to AMF through an NG-C interface and to UPF through an NG-U interface, respectively.

We will now describe the protocol structure between the network entities described above. 3 and/or 4, the layers of the air interface protocol between the UE and the network (e.g. NG-RAN and/or E-UTRAN) are of the Open Systems Interconnection (OSI) model, which is well known in communication systems. Based on the three lower layers, it can be classified into a first layer (L1), a second layer (L2), and a third layer (L3).

Figure 5 shows a block diagram of a user plane protocol stack to which the technical features of the present disclosure can be applied. Figure 6 shows a block diagram of a control plane protocol stack to which the technical features of the present disclosure can be applied.

The user/control plane protocol shown in Figures 5 and 6 is used in NR. However, the user/control plane protocol stack shown in Figures 5 and 6 can be used in LTE/LTE-A without loss of generality by replacing gNB/AMF with eNB/MME.

Referring to Figures 5 and 6, the physical (PHY) layer belongs to L1. The PHY layer provides information delivery services to the media access control (MAC) sublayer and higher layers. The PHY layer provides a MAC sublayer transmission channel. Between the MAC sublayer and PHY layer, data is transferred through a transport channel. Between different PHY layers, that is, between the PHY layer on the transmitting side and the PHY layer on the receiving side, data is transferred through physical channels.

The MAC sublayer belongs to L2. The main services and functions of the MAC sublayer include mapping between logical channels and transport channels, MAC service data units (SDUs) belonging to one or different logical channels, which are passed from transport blocks (TBs) to the physical layer of transport channels and vice versa. Multiplexing/demultiplexing, scheduling information reporting, error correction through Hybrid Automatic Repeat Request (HARQ), priority processing between UEs by dynamic scheduling, between logical channels of one UE by logical channel priority (LCP) Priority processing, etc. are included. The MAC sublayer provides a radio link control (RLC) sublayer logical channel.

The RLC sublayer belongs to L2. The RLC sublayer uses three transmission modes, namely transparent mode (TM), unacknowledged mode (UM), and acknowledged mode, to ensure the various quality of service (QoS) required by the radio bearer. mode: AM) is supported. The main services and functions of the RLC sublayer vary depending on the transmission mode. For example, the RLC sublayer provides transmission of upper layer PDUs for all three modes, but provides error correction through ARQ only over AM. In LTE/LTE-A, the RLC sublayer provides merging, separation and reassembly of RLC SDUs (only for UM and AM data carriage) and re-separation of RLC data PDUs (only for AM data carriage). In NR, the RLC sublayer provides separation (AM and UM only) and re-separation (AM only) of RLC SDUs and reassembly of SDUs (AM and UM only). That is, NR does not support merging of RLC SDUs. The RLC sublayer provides a packet data convergence protocol (PDCP) sublayer RLC channel.

The PDCP sublayer belongs to L2. The main services and functions of the PDCP sublayer for the user plane include header compression and decompression, forwarding of user data, duplication detection, PDCP PDU routing, retransmission of PDCP SDUs, encryption and decryption, etc. The main services and functions of the PDCP sublayer for the control plane include encryption and integrity protection, transmission of control plane data, etc.

The Service Data Adaptation Protocol (SDAP) sublayer belongs to L2. The SDAP sublayer is defined only in the user plane. The SDAP sublayer is defined only for NR. The main services and functions of SDAP include mapping between QoS flows and data radio bearers (DRBs), and marking of QoS flow IDs (QFI) in both DL and UL packets. The SDAP sublayer provides 5GC QoS flow.

The radio resource control (RRC) layer belongs to L3. The RRC layer is defined only on the control plane. The RRC layer controls radio resources between the UE and the network. For this purpose, the RRC layer exchanges RRC messages between the UE and BS. The main services and functions of the RRC layer include broadcasting of system information related to AS and NAS, paging, establishment, maintenance, and release of RRC connections between UEs and networks, security functions including key management, and establishment, configuration, and maintenance of radio bearers. and release, mobility functions, QoS management functions, UE measurement reporting and control of reporting, and delivery of NAS messages from the NAS to the UE or from the UE to the NAS.

In other words, the RRC layer controls logical channels, transport channels, and physical channels in relation to configuration, reconfiguration, and release of radio bearers. Radio bearer refers to the logical path provided by L1 (PHY layer) and L2 (MAC/RLC/PDCP/SDAP sublayer) for data transmission between UE and network. Setting up a radio bearer means defining the characteristics of the radio protocol layer and a channel to provide a specific service, and setting each parameter and operation method. Radio bearers can be divided into signaling RB (SRB) and data RB (DRB). SRB is used as a path to transmit RRC messages within the control plane, and DRB is used as a path to transmit user data within the user plane.

The RRC status indicates whether the RRC layer of the UE is logically connected to the RRC layer of E-UTRAN. In LTE/LTE-A, when the RRC connection is established between the RRC layer of the UE and the RRC layer of E-UTRAN, the UE is in the RRC connected state (RRC_CONNECTED). Otherwise, the UE is in RRC idle state (RRC_IDLE). In NR, the RRC inactive state (RRC_INACTIVE) is additionally introduced. RRC_INACTIVE can be used for various purposes. For example, Massive Machine Type Communication (MMTC) UEs can be efficiently managed in RRC_INACTIVE. When certain conditions are met, a transition from the above three states to another state is performed.

Certain operations may be performed depending on the RRC status. In RRC_IDLE, public area mobile network (PLMN) selection, broadcast of system information (SI), cell reselection mobility, core network (CN) paging and discontinuous reception (DRX) configured by the NAS can be performed. The UE must be assigned an identifier (ID) that uniquely identifies the UE in the tracking area. No RRC context is stored in the BS.

In RRC_CONNECTED, the UE has an RRC connection with a network (i.e. E-UTRAN/NG-RAN). Network-CN connectivity (both C/U-plane) is also established for the UE. UE AS context is stored in the network and UE. RAN knows which cell the UE belongs to. The network may transmit/receive data to/from the UE. Network controlled mobility, including measurements, is also performed.

Most operations performed in RRC_IDLE can be performed in RRC_INACTIVE. However, instead of CN performing paging in RRC_IDLE, RAN paging is performed in RRC_INACTIVE. In other words, in RRC_IDLE, paging for mobile terminated (MT) data is initiated by the core network and the paging area is managed by the core network. In RRC_INACTIVE, paging is initiated by the NG-RAN and the RAN-based notification area (RNA) is managed by the NG-RAN. Additionally, instead of DRX for CN paging being configured by NAS in RRC_IDLE, DRX for RAN paging is configured by NG-RAN in RRC_INACTIVE. Meanwhile, in RRC_INACTIVE, 5GC-NG-RAN connection (both C/U-plane) is established for the UE, and UE AS context is stored in NG-RAN and UE. NG-RAN knows which RNA the UE belongs to.

The NAS layer is located on top of the RRC layer. The NAS control protocol performs functions such as authentication, mobility management, and security control.

The physical channel can be modulated according to OFDM processing and uses time and frequency as radio resources. A physical channel consists of a number of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a number of subcarriers in the frequency domain. One subframe consists of multiple OFDM symbols in the time domain. A resource block is a resource allocation unit and consists of multiple OFDM symbols and multiple subcarriers. Additionally, each subframe may use a specific subcarrier of the corresponding subframe for the physical downlink control channel (PDCCH), i.e., a specific OFDM symbol (e.g., the first OFDM symbol) of the L1/L2 control channel. Transmission time interval (TTI) is the basic unit used by the scheduler for resource allocation. TTI may be defined in units of one or multiple slots, or in units of minislots.

Transmission channels are classified according to how and by what characteristics data is transferred across the air interface. The DL transport channel includes a broadcast channel (BCH) used to transmit system information, a downlink shared channel (DL-SCH) used to transmit user traffic or control signals, and a channel used to page the UE ( Includes PCH). UL transport channels include the Uplink Shared Channel (UL-SCH) for transmitting user traffic or control signals and the Random Access Channel (RACH), which is usually used to initiate access to a cell.

Different types of data delivery services are provided by the MAC sublayer. Each logical channel type is defined by what type of information is conveyed. Logical channels are classified into two groups: control channels and traffic channels.

The control channel is used only for conveying control plane information. The control channels include the Broadcast Control Channel (BCCH), Paging Control Channel (PCCH), Common Control Channel (CCCH), and Dedicated Control Channel (DCCH). BCCH of the DL channel is broadcasting system control information. The PCCH of the DL channel carries paging information and system information exchange notification. The CCCH is a channel for transmitting control information between the UE and the network. This channel is used for UEs that do not have an RRC connection with the network. The DCCH is a point-to-point bidirectional channel that transmits dedicated control information between the UE and the network. This channel is used for UEs that have an RRC connection.

Traffic channels are used only for transmission of user plane information. The traffic channel includes a dedicated traffic channel (DTCH). The DTCH is a point-to-point channel for transmission of user information and is dedicated to one UE. The DTCH may exist in both UL and DL.

Regarding the mapping between logical channels and transport channels in DL, BCCH can be mapped to BCH, BCCH can be mapped to DL-SCH, PCCH can be mapped to PCH, and CCCH can be mapped to DL-SCH. DCCH can be mapped to DL-SCH, and DTCH can be mapped to DL-SCH. In UL, CCCH can be mapped to UL-SCH, DCCH can be mapped to UL-SCH, and DTCH can be mapped to UL-SCH.

Figure 7 illustrates a frame structure in a 3GPP-based wireless communication system.

The frame structure shown in FIG. 7 is purely illustrative, and the number of subframes, number of slots, and/or number of symbols within the frame may vary. In a 3GPP based wireless communication system, OFDM numerology (e.g., subcarrier spacing (SCS), transmission time interval (TTI) period) may be configured differently among multiple cells for one UE. For example, if the UE is configured with different SCSs for the cells aggregated for that cell, the period (in absolute time) of a time resource (e.g. a subframe, slot, or TTI) containing the same number of symbols. These aggregated cells may differ from each other. In this disclosure, symbols may include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or Discrete Fourier Transform-Spread-OFDM (DFT-s-OFDM) symbols).

Referring to Figure 7, downlink and uplink transmissions are organized into frames. Each frame has a duration of Tf = 10 ms. Each frame is divided into two half-frames, each of which has a duration of 5 ms. Each half frame consists of 5 subframes, and the period Tsf per subframe is 1 ms. Each subframe is divided into slots, and the number of slots in a subframe varies depending on the subcarrier spacing. Each slot contains 14 or 12 OFDM symbols based on a cyclic prefix (CP). In normal CP, each slot contains 14 OFDM symbols, and in extended CP, each slot contains 12 OFDM symbols. The numerology is based on an exponentially scalable subcarrier spacing βf = 2u*15 kHz. The table below shows the number of OFDM symbols per slot, the number of slots per frame, and the number of slots for a typical CP according to the subcarrier spacing of βf = 2u*15 kHz.

u Nslotsymb Nframe,uslot Nsubframe,uslot 0 14 10 One One 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

The table below shows the number of OFDM symbols per slot for βf = 2u*15 kHz subcarrier spacing, the number of slots per frame, and the number of slots for extended CP.

u Nslotsymb Nframe,uslot Nsubframe,uslot 2 12 40 4

A slot contains a number of symbols (eg, 14 or 12 symbols) in the time domain. For each numerology (e.g. subcarrier spacing) and carrier, a resource grid of Nsize,ugrid,x*NRBsc subcarriers and Nsubframe,usymb OFDM symbols is defined, which can be used for higher layer signaling (e.g. wireless It starts from the common resource block (CRB) Nstart,ugrid specified by Resource Control (RRC) signaling), where Nsize,ugrid,x is the number of resource blocks (RBs) in the resource grid and the subscript x is the DL for downlink. and UL for the uplink. NRBsc is the number of subcarriers per RB. In a 3GPP-based wireless communication system, NRBsc is generally 12. There is one resource grid for a given antenna port p, subcarrier spacing configuration u, and transmission direction (DL or UL). The carrier bandwidth Nsize,ugrid for subcarrier spacing configuration u is given by higher layer parameters (e.g. RRC parameters). Each element in the resource grid for antenna port p and subcarrier spacing configuration u is called a resource element (RE), and one complex symbol can be mapped to each RE. Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index l indicating the symbol position relative to a reference point in the time domain. In a 3GPP-based wireless communication system, RB is defined by 12 consecutive subcarriers in the frequency domain. In the 3GPP NR system, RBs are classified into CRBs and physical resource blocks (PRBs). For subcarrier spacing configuration u, the CRBs are numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of CRB 0 for subcarrier spacing configuration u coincides with 'point A', which serves as a common reference point for the resource block grid. In the 3GPP NR system, PRBs are defined within bandwidth parts (BWP) and are numbered from 0 to NsizeBWP,i-1, where i is the number of bandwidth parts. The relationship between the physical resource block nPRB and the common resource block nCRB in the bandwidth part i is as follows: nPRB = nCRB + NsizeBWP,i, where NsizeBWP,i is the common resource block whose bandwidth part starts for CRB 0. The BWP includes multiple consecutive RBs. A carrier may contain up to N (e.g., 5) BWPs. A UE may be configured with one or more BWPs on a given component carrier. Among BWPs, only one BWP configured with the UE can be activated at a time. The activated BWP defines the UE's operating bandwidth within the cell's operating bandwidth. In this disclosure, the term “cell” refers to a geographic area, or wireless resource, in which one or more nodes provide a communication system. A “cell” in a geographic area can be understood as the coverage within which services can be provided using a carrier, and a “cell” as a radio resource (e.g. a time-frequency resource) can be understood as a bandwidth, which is the frequency range configured by the carrier. (bandwidth: BW). A “cell” associated with a radio resource is defined by a combination of downlink and uplink resources, for example, a combination of a downlink (DL) component carrier (CC) and an uplink (UL) CC. The cell may be comprised of only downlink resources, or may be comprised of downlink resources and uplink resources. Since DL coverage, which is the range within which a node can transmit a valid signal, and UL coverage, which is the range within which a node can receive a valid signal from a UE, depend on the carrier carrying the signal, the coverage of the node is used by the node. It may be associated with the coverage of a “cell” of radio resources. Accordingly, the term "cell" may sometimes be used to denote the service coverage of a node, at other times a radio resource, or at other times the range over which a signal using said radio resource can reach at effective strength.

In carrier aggregation (CA), two or more CCs are aggregated. The UE can simultaneously perform reception or transmission on one or multiple CCs depending on its capacity. CA is supported for both combustion and discontinuous CC. Once the CA is configured, the UE has only one radio resource control (RRC) connection with the network. In RRC connection establishment/re-establishment/handover, one serving cell provides non-access stratum (NAS) mobility information, and in RRC connection establishment/re-establishment/handover, one serving cell provides Provides secure input. This cell is called the primary cell (PCell). A PCell is a cell operating on a primary frequency, within which the UE performs an initial connection establishment procedure or initiates a connection re-establishment procedure. Depending on the capacity of the UE, the secondary cell (SCell) may be configured to form a set of serving cells together with the PCell. A SCell is a cell that provides additional radio resources on top of a special cell. Therefore, the set of serving cells configured for a UE always consists of one PCell and one or more SCells. For dual connectivity operation, the term SpCell refers to either the PCell of the Master Cell Group (MCG) or the PSCell of the Secondary Cell Group (SCG). SpCell supports PUCCH transmission and contention-based random access and is always active. The MCG is a group of serving cells associated with a master node and consists of an SpCell (PCell) and optionally one or more SCells. The SCG is a subset of serving cells associated with a secondary node and consists of a PSCell and zero or more SCells for a UE configured with dual connectivity (DC). For UEs that do not have RRC_CONNECTED configured as CA/DC, there is only one serving cell containing the PCell. For a UE in RRC_CONNECTED configured as a CA/DC, the term "serving cell" is used to denote the SpCell(s) and the set of cells containing all SCells. In DC, two MAC objects are configured within one UE, one for the MCG and one for the SCG.

Figure 8 illustrates an example of data flow in a 3GPP NR system.

In Figure 8, "RB" represents a radio bearer and "H" represents a header. Radio bearers are classified into two groups: data radio bearers (DRB) for user plane data and signaling radio bearers (SRB) for control plane data. The MAC PDU is transmitted/received to/from an external device through the PHY layer using radio resources. These MAC PDUs reach the PHY layer in the form of transport blocks.

At the PHY layer, uplink transport channels UL-SCH and RACH are mapped to their physical channels PUSCH and PRACH, respectively, and 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. The MAC PDU related to the UL-SCH is transmitted by the UE through the PUSCH based on the UL grant, and the MAC PDU associated with the DL-SCH is transmitted by the BS through the PDSCH based on DL designation.

In the present disclosure, data unit(s) (e.g. PDCP SDU, PDCP PDU, RLC SDU, RLC PDU, RLC SDU, MAC SDU, MAC CE, MAC PDU) are allocated resources (e.g. UL grant, DL designation). Based on this, it is transmitted/received on a physical channel (e.g. PDSCH, PUSCH). In this disclosure, uplink resource allocation is also referred to as uplink grant, and downlink resource allocation is also referred to as downlink assignment. This resource allocation includes time domain resource allocation and frequency domain resource allocation. In this disclosure, the uplink grant is received dynamically on the PDCCH by the UE in a Random Access Response or configured to the UE partially consistently by RRC. In this disclosure, the downlink designation is received dynamically by the UE on the PDCCH, or is set semi-persistently to the UE by RRC signaling from the BS.

Below, cell selection and reselection are explained.

The UE must perform measurements for cell selection and reselection.

The UE uses the parameters provided by the serving cell when evaluating the Srxlev and Squal of the non-serving cell for reselection evaluation, and for final confirmation of the cell selection criteria, the UE uses the parameters provided by the target cell for cell reselection. parameters must be used.

The NAS may control the RAT(s) on which cell selection should be performed, for example by directing the RAT(s) associated with the selected PLMN and maintaining a list and list of prohibited registration area(s). The UE of the equivalent PLMN must select an appropriate cell according to RRC_IDLE or RRC_INACTIVE status measurement and cell selection criteria.

To facilitate the cell selection process, information about several stored RATs may be used by the UE, if available.

When camping in a cell, the UE must regularly search for a better cell based on cell reselection criteria. If a better cell is found, that cell is selected. A change in the cell may mean a change in the RAT.

The NAS receives instructions if there are any changes in the NAS-related system information received as a result of cell selection and reselection.

For normal service, the UE camps on an appropriate cell and monitors the control channel(s) of that cell, allowing the UE to:

- Receive system information from PLMN or SNPN; and

- Receive registration area information, e.g. tracking area information, from PLMN or SNPN; and

- Receive other AS and NAS information; and

- If registered:

- Receive paging and notification messages from PLMN or SNPN; and

- Initiates transition to connected mode.

For cell selection in multi-beam operation, the measurements of the cell are dependent on the UE implementation.

For cell reselection in multi-beam operations involving inter-RAT reselection from E-UTRA to NR, the measurements of this cell are derived between beams corresponding to the same cell based on the SS/PBCH block as follows:

- if nrofSS-BlocksToAverage ( maxRS-IndexCellQual in E-UTRA) is not set in SIB2/SIB4 (SIB24 in E-UTRA); or

- if absThreshSS-BlocksConsolidation ( threshRS-Index in E-UTRA ) is not set in SIB2/SIB4 (SIB24 in E-UTRA); or

- If the best beam measurement value is less than or equal to absThreshSS-BlocksConsolidation (E-UTRA's threshRS-Index ):

- The cell measurement value is derived from the highest beam measurement value.

- Otherwise:

- Derive cell measurements as the linear average of the maximum nrofSS- BlocksToAverage ( maxRS-IndexCellQual in E-UTRA) power value of the highest beam measurement value higher than absThreshSS-BlocksConsolidation (threshRS- Index in E-UTRA).

Below, the cell selection process will be described.

Cell selection is performed by one of two procedures:

a) Initial cell selection (no prior knowledge of which RF channel is the NR frequency):

1. The UE must scan all RF channels in the NR band according to its capabilities to find a suitable cell.

2. At each frequency, the UE only needs to search for the strongest cell, except for operations using shared spectrum channel access where the UE can search for the next strongest cell(s).

3. When a suitable cell is found, select it.

b) Cell selection using stored information:

1. This procedure requires previously received measurement control information elements or stored frequency information from previously detected cells and optionally information on cell parameters.

2. Once the UE finds a suitable cell, it must select it.

3. If no suitable cell is found, the initial cell selection procedure of a) is started.

Priorities between different frequencies or RATs provided to the UE by system information or dedicated signaling are not used in the cell selection process.

The cell selection criterion S can be satisfied when Srxlev > 0 and Squal > 0. Srxlev is equal to {Qrxlevmeas-(Qrxlevmin+Qrxlevminoffset)-Pcompensation-Qoffsettemp}. Squal is equivalent to {Qqualmeas-(Qqualmin+Qqualminoffset)-Qoffsettemp}. Parameters can be defined as shown in the following table:

Srxlev Cell selection RX level value (dB) Squal Cell selection quality value (dB) Qoffset _temp Offset temporarily applied to cells Q _rxlevmeas Measuring cell RX level value (RSRP) Q _qualmeas Measured Cell Quality Value (RSRQ) Q _rxlevmin Minimum RX level required in the cell (dBm). If the UE supports the SUL frequency for this cell, Qrxlevmin is obtained from q-RxLevMinSUL and, if present, in SIB1, SIB2 and SIB4, in addition to QrxlevminoffsetcellSUL, if present in SIB3 and SIB4 for that cell, this cell-specific offset It is added to the corresponding Qrxlevmin to achieve the minimum RX level required in the relevant cell. Otherwise, Qrxlevmin is obtained from q-RxLevMin of SIB1, SIB2 and SIB4. Additionally, if Qrxlevminoffsetcell is in SIB3 and SIB4 of that cell, this cell specific offset is added to that Qrxlevmin to achieve the minimum required RX level in that cell. Q _qualmin Minimum quality level (dB) required by the cell. Additionally, if Qqualminoffsetcell is signaled for that cell, this cell-specific offset is added to achieve the minimum quality level required for that cell. Q _{rxlevminoffset} Offset for signal Q _rxlevmin considered in Srxlev evaluation as a result of periodic search for higher priority PLMN during normal camping in VPLMN. Q _{qualminoffset} Offset for signal Q _qualmin considered in Squal evaluation as a result of periodic search for higher priority PLMN during normal camping in VPLMN. P _compensation For FR1, if the UE supports additionalPmax in NR-NS-PmaxList if present in SIB1, SIB2 and SIB4:max(PEMAX1 -PPowerClass, 0) - (min(PEMAX2, PPowerClass) - min(PEMAX1, PPowerClass) )(dB);
Otherwise:
Maximum(PEMAX1 -PPowerClass, 0) (dB)
For FR2, Pc _opensation is set to 0. P _EMAX1 , P _EMAX2 The maximum TX power level of the UE can be used when transmitting on the uplink of the cell (dBm). If the UE supports SUL frequencies for this cell, P _EMAX1 and P _EMAX2 are obtained from p-Max for SUL in SIB1 and NR-NS-PmaxList for SUL in SIB1, SIB2 and SIB4 respectively, otherwise P _EMAX1 and P _EMAX2 are obtained from p-Max and NR-NS-PmaxList in SIB1, SIB2, and SIB4 for general UL, respectively. P _PowerClass The maximum RF output power of the UE (dBm) according to the UE power rating.

The signaled values Q _{rxlevminoffset} and Q _{qualminoffset} are applied only when the cell is evaluated for cell selection as a result of periodic search for a higher priority PLMN while normally camping in the VPLMN. During this periodic search for a higher priority PLMN, the UE may check the cell's S criteria using stored parameter values from other cells of this higher priority PLMN. Below, the cell reselection evaluation process is described. The absolute priority of different NR frequencies or inter-RAT frequencies can be provided to the UE by taking over from other RATs in system information, RRCRelease messages or inter-RAT cell (re)selection. For system information, NR frequencies or inter-RAT frequencies may be listed without providing a dedicated priority (i.e., there is no cellReselectionPriority field for those frequencies). If dedicated priorities (e.g. cellReselectionPriority and/or cellReselectionPriorities fields) are provided in dedicated signaling (e.g. RRCRelease message), the UE shall ignore any priorities provided in the system information. If the UE is camped in any cell, the UE must only apply the priority provided by the system information of the current cell, and unless otherwise specified, the UE applies the dedicated priority provided by deprioritisationReq received from dedicated signaling and RRCRelease . Preserve. If a UE in a normally camped state only has a dedicated priority other than the current frequency, the UE must consider the current frequency as the lowest priority frequency (i.e., lower than the network setting value). If the UE is configured to perform both NR sidelink communication and V2X sidelink communication, the UE may consider the frequency that provides both NR sidelink communication settings and V2X sidelink communication settings as the highest priority. If the UE is configured to perform NR sidelink communication and does not perform V2X communication, the UE may consider the frequency providing NR sidelink communication configuration as the highest priority. If the UE is configured to perform V2X sidelink communication and does not perform NR sidelink communication, the UE may consider the frequency that provides V2X sidelink communication settings as the highest priority. The frequency that provides only anchor frequency settings is When reselecting a cell, priority should not be given to V2X services.

When a UE configured to perform NR sidelink communication or V2X sidelink communication performs cell reselection, the frequencies providing intra-carrier and inter-carrier settings in cell reselection can be considered to have the same priority. .

The priority between frequencies that the UE considers to be the highest priority frequencies is left to the UE implementation.

The UE is set to perform V2X sidelink communication or NR sidelink communication if it is capable and authorized for the corresponding sidelink operation.

If the UE is configured to perform both NR sidelink communication and V2X sidelink communication, but cannot find a frequency that can provide both NR sidelink communication setup and V2X sidelink communication setup, the UE will use NR sidelink communication setup or V2X sidelink communication setup. Frequencies that provide sidelink communication settings can be considered as the highest priority.

The UE shall perform cell reselection evaluation only for NR frequencies and inter-RAT frequencies provided in the system information and with priorities provided by the UE.

When the UE receives a RRCRelease with deprioritisationReq, the UE changes the current frequency and any stored frequency or all frequencies in the NR to the lowest priority frequency (i.e. lower than the network set value) due to the previously received RRCRelease with deprioritisationReq. must be considered On the other hand, T325 runs regardless of the camped RAT. The UE must delete the stored priority release request(s) when PLMN selection or SNPN selection is performed at the request of the NAS.

The UE must find a higher priority layer for cell reselection as soon as possible after a priority change. Minimum relevant performance requirements are still applicable.

The UE shall delete the dedicated priority provided by dedicated signaling in the following cases:

- UE enters another RRC state; or

- The optional validity time of the dedicated priority (e.g. T320) has expired; or

- UE receives RRCRelease message without cellReselectionPriorities field; or

- PLMN selection or SNPN selection is performed as requested by the NAS.

The UE will not consider any blacklisted cell as a candidate for cell reselection.

The UE, if configured, should only consider whitelist cells as candidates for cell reselection.

A UE in RRC_IDLE state must take over the dedicated priority provided by dedicated signaling and the remaining valid time (i.e. T320 in NR and E-UTRA) when (re)selecting an inter-RAT cell.

The network can assign dedicated cell reselection priority to frequencies not set by system information.

The UE uses the rules below to limit the measurements needed:

- If the serving cell satisfies Srxlev > SIntraSearchP and Squal > SIntraSearchQ, the UE may choose not to perform in-frequency measurements.

- Otherwise, the UE must perform in-frequency measurements.

- The UE shall apply the following rules for the NR inter-frequencies and inter-RAT frequencies indicated in the system information and for which the UE has priority:

- For NR inter-frequencies or inter-RAT frequencies that have a higher reselection priority than the reselection priority of the current NR frequency, the UE must perform measurement of the higher priority NR inter-frequency or inter-RAT frequency. do.

- For NR inter-frequencies with a reselection priority equal to or lower than the reselection priority of the current NR frequency and for inter-RAT frequencies with a reselection priority lower than the reselection priority of the current NR frequency:

- If the serving cell satisfies Srxlev > SnonIntraSearchP and Squal > SnonIntraSearchQ, the UE may choose not to perform measurements of NR inter-frequency or inter-RAT frequency cells of the same or lower priority.

- Otherwise, the UE must perform measurements of NR inter-frequency or inter-RAT frequency cells of the same or lower priority.

- If the UE supports relaxed measurements and relaxed measurements exist in SIB2, the UE may additionally relax the required measurements.

If threshServingLowQ is broadcast in the system information and more than 1 second has passed since the UE camped on the current serving cell, cell reselection is performed to a cell on an NR frequency or inter-RAT frequency with a higher priority than the serving frequency in the following cases: It should be:

- If a cell of higher priority NR or EUTRAN RAT/frequency satisfies Squal > ThreshX, HighQ during the time interval TreselectionRAT.

Otherwise, cell reselection for cells on a higher priority NR frequency or inter-RAT frequency than the serving frequency should be performed in the following cases:

- Cells of higher priority RAT/frequency satisfy Srxlev > ThreshX, HighP during the time interval TreselectionRAT; and

- More than 1 second has passed since the UE camped in the current serving cell.

Cell reselection for cells of the same priority NR frequency is based on ranking for cell reselection within the frequency.

If threshServingLowQ is broadcast in the system information and more than 1 second has passed since the UE camped on the current serving cell, the serving cell satisfies Squal < ThreshServing, LowQ and a cell of lower priority NR or E-UTRAN RAT/frequency If Squal > ThreshX, LowQ is met during the TreselectionRAT time interval, cell reselection shall be performed to a cell on a lower priority NR frequency or inter-RAT frequency than the serving frequency.

Otherwise, cell reselection for cells on lower priority NR frequencies or inter-RAT frequencies than the serving frequency should be performed in the following cases:

- The serving cell satisfies Srxlev < ThreshServing, LowP and the cells of lower priority RAT/frequency satisfy Srxlev > ThreshX, LowP during the time interval TreselectionRAT. and,

- When more than 1 second has passed since the UE camped in the current serving cell.

Cell reselection to a higher priority RAT/frequency will take precedence over a lower priority RAT/frequency if multiple cells of different priorities meet the cell reselection criteria.

If more than one cell meets the above criteria, the UE must reselect the cells as follows:

- If the highest priority frequency is an NR frequency, the highest ranked cell among cells on the highest priority frequency(s) that satisfies the criteria.

- If the highest priority frequency is from another RAT, then the strongest cell among the cells in the highest priority frequency(s) that meets that RAT's criteria.

The cell ranking standard Rs for the serving cell is defined as Rs = Qmeas,s + Qhyst - Qoffsettemp. The cell ranking standard Rn for neighboring cells is defined as Rn = Qmeas,n-Qoffset-Qoffsettemp. Parameters are defined as in the table below:

Qmeas RSRP measurement level used for cell reselection Qoffset For intra-frequency: If Qoffsets,n is valid, equal to Qoffsets,n, otherwise 0. For inter-frequency: If Qoffsets,n is valid, equal to Qoffsets,n plus Qoffsetfrequency. Otherwise, it is the same as Qoffsetfrequency. Qoffsettemp Offset temporarily applied to cells

The UE must rank all cells that meet the cell selection criterion S. Cells are ranked according to the R criteria described above by deriving Qmeas,n and Qmeas,s and calculating the R value using the average RSRP results. If rangeToBestCell is not set, the UE re-cells to the highest ranked cell. A choice must be made.

When rangeToBestCell is set, the UE must perform cell reselection to the cell with the largest number of beams above the threshold (i.e. absThreshSS-BlocksConsolidation) among cells within rangeToBestCell of the highest R value. If there are multiple such cells, the UE must perform cell reselection with the highest ranked cell among them.

In all cases, the UE should reselect a new cell only if the following conditions are met:

- the new cell is superior to the serving cell according to the cell reselection criteria specified above during the TreselectionRAT time interval;

- When more than 1 second has passed since the UE camps on the current serving cell.

If rangeToBestCell is set but absThreshSS-BlocksConsolidation is not set at the NR frequency, the UE assumes that there is one beam above the threshold for each cell at that frequency.

Other parameters are defined in section 5.2.4.7 of 3GPP TS 38.304 V16.0.0.

Below, network slicing is explained.

Network slicing allows operators to create customized networks to provide optimized solutions for different market scenarios with different requirements. In the areas of functionality, performance and isolation. A network slice consists of all network functions (NFs) required to provide the necessary communication services and network functions and the resources that run these NFs.

NF refers to processing functions in the network. This includes, but is not limited to, communication node functions and switching functions (e.g., Ethernet switching functions, IP routing functions). In other words, NF defines functional behavior and interfaces. NFs can be implemented as network elements on dedicated hardware, as software instances running on dedicated hardware, or as virtualized functions instantiated on an appropriate platform. In cloud infrastructure. A virtual NF (VNF) is a virtualized version of NF.

The network slicing concept consists of three layers: 1) service instance layer, 2) network slice instance layer, and 3) resource layer.

The service instance layer represents the service to be supported (end-user service or business service). Each service is represented by a service instance. A service instance is an instance of an end-user service or business service realized within or by a network slice. Typically, services can be provided by a network operator or a ^3rd party. Accordingly, a service instance may represent an operator service or a ^3rd party provided service.

The network operator uses the network slice blueprint to create network slice instances. A network slice instance provides the necessary network characteristics to a service instance. A network slice instance is a set of NFs and the resources that run these NFs, forming a complete instantiated logical network to satisfy the specific network characteristics required by a service instance.

- A network slice instance may be completely or partially isolated, logically and/or physically, from other network slice instances.

- Resources consist of physical resources and logical resources.

- A network slice instance can be composed of subnetwork instances, and in special cases can be shared by multiple network slice instances. A network slice instance is defined by a network slice blueprint.

- When creating a network slice instance, policy and configuration for each instance are required.

- Examples of network characteristics include ultra-low latency and ultra-reliability.

A network slice instance may also be shared across multiple service instances provided by a network operator.

A network slice blueprint is a complete description of the structure, configuration, and planning/workflow of how to instantiate and control a network slice instance throughout its life cycle. Network slice blueprints enable the instantiation of network slices that provide specific network characteristics (e.g. ultra-low latency, ultra-reliability, value-added services for enterprises, etc.). A network slice blueprint represents the required physical and logical resources and/or subnetwork blueprints.

A network slice instance may not consist of one or more subnetwork instances that may be shared by other network slice instances. Similarly, subnetwork blueprints are used to create subnetwork instances to form a set of NFs running on physical/logical resources. A subnetwork instance consists of a set of NFs and resources for these NFs.

- A subnetwork instance is defined by a subnetwork blueprint.

- No subnetwork instances are required to form a complete logical network.

- A subnetwork instance can be shared by two or more network slices.

- Resources consist of physical resources and logical resources.

A subnetwork blueprint is a description of the structure (and included components) and configuration of a subnetwork instance, and a plan/workflow for how to instantiate it. Subnetwork blueprints reference physical and logical resources and can reference other subnetwork blueprints.

Physical resources are physical assets for computation, storage, or transmission, including wireless access. NF is not considered a resource.

A logical resource is a division of a physical resource or a grouping of multiple physical resources that are dedicated to NFs or shared across a set of NFs.

As one solution for network slicing, a single set of C-plane functions common across core network instances is shared across multiple core network instances to enable UEs to simultaneously obtain service from multiple network slices of one network operator. . Additionally, other C-plane functions that are not common reside in that core network instance and are not shared with other core network instances.

Figure 9 shows an example of sharing a common C-plane function set between multiple core network instances. The principle of the solution shown in Figure 9 is as follows:

- A core network instance (i.e. network slice) consists of a single set of C-plane functions and a single set of U-plane functions.

- The core network instance is dedicated for UEs belonging to the same UE type. UE type identification is performed using specific parameters (e.g. UE usage type) and/or the UE's subscription information.

- The C-plane function set is responsible for admitting the UE into the network, for example by supporting UE mobility when required or by performing authentication and subscription confirmation.

- All C-plane functions common to multi-core network instances do not need to be created multiple times.

- Other C-plane functions that are not common to other core network instances are used only in their own core network instance.

- The U-plane function set of the core network instance is responsible for providing specific services to the UE and transmitting U-plane data for the specific service. For example, the U-Plane feature set in Core Network Instance #1 provides enhanced mobile broadband services to the UE, while the other U-Plane feature set in Core Network Instance #2 provides critical communication services to the UE.

- Each UE may have multiple U-plane connections with different sets of U-plane functionality available simultaneously in different core network instances.

- NSSF (Network Slice Selection Function) is responsible for selecting a core network instance to accommodate the UE, considering the UE's subscription and specific parameters (e.g., UE usage type).

- CPSF (C-Plane Selection Function) is responsible for selecting the C-Plane function within the selected core network instance with which the base station must communicate. This C-plane function selection is performed using specific parameters (e.g. UE usage type).

Meanwhile, the UE can receive dedicated reselection information. Dedicated reselection information may include one or more dedicated priorities (e.g., cellReselectionPriorities and/or cellReselectionPriority ) and may be received via dedicated signaling, such as an RRC release message. The dedicated reselection information may further include additional priority values that are conditionally applicable. For example, dedicated reselection information may include slice-specific priority information, and additional priority of a frequency may be applied only if the frequency is preferred by the UE or supports a desired slice.

The dedicated reselection priority and/or the dedicated priority always takes precedence over the priority broadcast by the cell (i.e., the common/broadcast priority received via common/broadcast signaling such as system information). In general, overwriting a broadcast priority with a dedicated priority may not cause problems. Because dedicated priority values can be completely controlled by the network. That is, the network may have tight control over the frequencies prioritized by the UE and the possibility of statistical control over the camping frequencies of the UE. However, if an additional priority value is used for cell reselection (e.g., a slice-specific priority value for a frequency that can be applied if the frequency supports the UE's preferred or desired slice), the network This tight control potential can be lost. This is because additional priority values may be applied depending on UE-side information (e.g., UE's preferences/intentions) and the UE's preferences/intentions may not be completely known to the network. To increase the network's controllability over the UE's camping frequency, it may be desirable for each cell to be able to control whether or not to apply such UE-side information-based reselection.

10 shows an example of a method performed by a UE according to an embodiment of the present disclosure. The method illustrated in FIG. 10 can also be performed by a wireless device.

Referring to FIG. 10, in step S1001, the UE may receive, from the first cell, a first priority value for a frequency and a second priority value related to a slice supported by the frequency.

In step S1003, the UE may receive priority control information from the second cell indicating whether to apply the second priority value to the frequency for cell reselection.

In step S1005, the UE may determine a priority value to be applied to the frequency for cell reselection among the first priority value and the second priority value based on priority control information.

In step S1007, the UE may perform cell reselection based on the determined priority value for the frequency.

According to various embodiments, the UE may receive slice information indicating one or more slices supported by the frequency from the network. One or more slices may include the slice. Slice information may include a slice identifier (ID) of the slice. The network may include at least one of a first cell or a second cell.

According to various embodiments, the UE may receive settings for a frequency list including the frequency from the network. Priority control information indicates whether to apply a second priority value to the frequency for cell reselection, and whether to apply the second priority value to one or more other frequencies in the frequency list for cell reselection. They may not tell you. The network may include at least one of a first cell or a second cell.

According to various embodiments, the UE may receive settings for a frequency list including the frequency from the network. Priority control information may inform whether to apply a second priority value to all frequencies in the frequency list for cell reselection.

According to various embodiments, priority control information informs whether to apply a second priority value to the frequency for the slice, and applies a second priority value to the frequency for one or more other slices supported by the slice. It may not tell you whether to apply it or not.

According to various embodiments, the UE may i) priority control information informs to apply the first priority value to the frequency, or ii) apply the first priority value based on the slice being not preferred by the UE. It may be decided to apply to the above frequencies.

According to various embodiments, the UE i) priority control information informs to apply a second priority value to the frequency, and ii) applies a second priority value to the frequency based on the slice being preferred by the UE. You can decide to apply it.

According to various embodiments, the priority value to be applied to the frequency may be determined as the highest value in the frequency list set by the network based on the slice being preferred by the UE. The network may include at least one of a first cell or a second cell.

According to various embodiments, the UE may determine the highest priority frequency in a frequency list set by the network based on comparing the priority value for the frequency with the priority value for at least one frequency in the frequency list. there is. The UE may perform cell reselection from the highest priority frequency to the highest priority cell.

According to various embodiments, the UE may receive dedicated priority/reselection information for the frequency list. Dedicated priority/reselection information may include a first priority value for each frequency. Dedicated priority/reselection information may include at least one secondary priority value associated with one or more slices. The UE may camp on a cell that is likely to broadcast instructions. The UE can determine the reselection priority of each frequency based on the instruction. If the status of the indication corresponds to the first status value, the UE may determine that the reselection priority is the first priority value. The UE may determine that the reselection priority is the second priority value if the state of the indication corresponds to the second state value. The UE may reselect the highest priority cell at the frequency with the highest priority value.

Figure 11 shows an example of a method for controlling cell reselection priority override according to an embodiment of the present disclosure. The method may be performed by a UE and/or a wireless device.

Referring to FIG. 11, in step S1101, the UE may receive settings including dedicated priority information (or dedicated reselection information) for the frequency list. The UE can be set a dedicated priority for the frequency list.

Dedicated priority information may include a first priority value (eg, cellReselectionPriority ) for each frequency.

Dedicated priority information may include at least one second priority value. The second priority value may be associated with at least one slice (or slice ID). Dedicated priority information may indicate a second priority value (or a second priority value set) for each slice or slice set. Dedicated priority information may indicate a second priority value (or second priority value set) and slice ID(s) associated with each frequency. The second priority value may be a slice-specific priority value for a frequency that is applicable when the frequency supports a slice preferred or desired by the UE.

In step S1103, the UE may receive indication(s) (eg, priority control information) from the cell for controlling whether the second priority value can be applied for cell reselection. The indication(s) may be broadcast by the cell.

With reference to the indication(s), the UE may determine whether the second priority value can be applied to cell reselection.

Preferably, the indication(s) may be provided in a broadcast manner (eg broadcast/common signaling such as system information) and/or dedicated signaling.

Instruction(s) may be provided by frequency or cell.

In some implementations, the cell may indicate whether the UE is allowed to apply a secondary priority value for each frequency, if applicable.

For example, a cell may transmit the following information (e.g., system information such as system information block type 4 (SIB4)) through dedicated signaling and/or broadcast signaling as shown in Table 7:

oList of 'InterFreqCarrierFreqInfo'soInterFreqCarrierFreqInfo IE <== per-frequency cell reselection information§dl-CarrierFreq§??§cellReselectionPriority　　　 <== first priority value §cellReselectionSubPriority <==　 first sub priority value §??§List of 'supportedSliceInfo'sosupportedSliceInfo IE§slice ID§cellReselectionPriority2　　 <==slice-specific priority value/second priority value§dedicatedReselectionPriority2NotAllowed (i.e., indication(s)/priority control information)·if present, UE considers that the dedicated second priority value associated with the slice (indicated by the slice ID) for this frequency (indicated by dl-CarrierFreq) is not applicable while camping on the current serving cell, i.e., applies the first priority value for this frequency for cell reselection. ·If absent, UE considers that the dedicated second priority value associated with the slice (indicated by the slice ID) for this frequency (indicated by dl-CarrierFreq) is applicable while camping on the current serving cell, i.e., applies the second priority value for this frequency for cell reselection if the frequency supports UE's preferred/intended slice.

As another example, a cell may transmit the following information (e.g., system information such as system information block type 4 (SIB4)) through dedicated signaling and/or broadcast signaling as shown in Table 8:

oList of 'InterFreqCarrierFreqInfo'soInterFreqCarrierFreqInfo IE <== per-frequency cell reselection information §dl-CarrierFreq§??§cellReselectionPriority　　　 <== first priority value §cellReselectionSubPriority <==　 first sub priority value §??§List of 'supportedSliceInfo'sosupportedSliceInfo IEoslice IDocellReselectionPriority2　　 <==slice-specific priority value/second priority valueodedicatedReselectionPriority2Allowed (i.e., indication(s)/priority control information)if present, UE considers that the dedicated second priority value associated with the slice (indicated by the slice ID) for this frequency (indicated by dl-CarrierFreq) may be applicable while camping on the current serving cell, i.e., applies the second priority value for this frequency for cell reselection if the frequency supports UE's preferred/intended slice.If absent,　UE considers that the dedicated second priority value associated with the slice (indicated by the slice ID) for this frequency (indicated by dl-CarrierFreq) is not applicable while camping on the current serving cell, i.e., applies the first priority value for this frequency for cell reselection.

In some implementations, the cell may indicate whether the UE is allowed to apply the second priority value to any frequency for which the second priority value is set. The cell may transmit the following information (e.g., system information such as system information block type 1 (SIB1)) through dedicated signaling and/or broadcast signaling as shown in Table 9:

oodedicatedReselectionPriority2NotAllowed　　 <== if present, UE considers that any dedicated second priority value is not applicable while camping on the current serving cell, i.e., applies the first priority value for all frequencies for cell reselection.

The dedicated second priority value may be set through a dedicated message (eg, RRC release message). The dedicated message/RRC release message may include information elements as illustrated in Table 10:

oocellReselectionPriorities.§frequencyPriorityListNR·List of the following entries·carrierFreq·cellReselectionPriority·cellReselectionSubPriority§sliceSpecificPriorityListNR·List of the following entries·sliceID·cellReselectionPriority　　　　　second　 <== second priority value·cellReselectionSubPriority　 <== sub priority value

While the UE with the desired/intended slice(s) is camping on the cell, the UE may perform cell reselection as in steps S1105 and S1107. In step S1105, the UE may determine the frequency priority value of the corresponding frequency. For example, if a frequency supports the desired slice and a second priority value is available for the frequency and the second priority value is applicable to the frequency determined with reference to the corresponding indication(s), the UE may The second priority value associated with the desired slice may be considered the frequency priority value for that frequency. As another example, if a frequency supports a desired slice and a second priority value is available for that frequency, the indication(s) ), if the second priority value is not applicable for the frequency, the UE may regard the first priority value of the frequency as the frequency priority value of that frequency.

As another example, if the frequency supports the UE's preferred/intended slice and the serving cell does not broadcast/transmit an extra frequency priority value (i.e. second priority value) associated with that slice, the UE may The priority value of can be considered a predefined value (preferably the highest priority).

In some implementations, the network may set indication(s) to the UE through dedicated signaling. In this case, the indication(s) may control whether the UE is allowed to apply slice-specific priority information broadcast by the camping cell.

For example, the instructions may be UE-specific instructions. If the UE receives an indication corresponding to the state (e.g., set to true or present), the UE may consider the slice-specific priority value broadcast in the camping cell to be applicable. If the UE receives an indication corresponding to a different state (e.g., set to false or absent), the UE may consider the slice-specific priority value broadcast in the camping cell to be not applicable. That is, only legacy priority information and/or first priority values can be considered.

As another example, the indication may be a frequency-specific indication. If the UE receives an indication corresponding to a status for a frequency (e.g., set to true or present), the UE may consider the slice-specific priority value broadcast in the camping cell to be applicable to that frequency. If the UE receives an indication corresponding to a different state for a frequency (e.g., set to false or absent), the UE may consider that the slice-specific priority value broadcast in the camping cell does not apply to that frequency. there is. That is, only legacy priority information about frequency (eg, first priority value) can be considered.

In some implementations, the UE may determine the cell reselection priority value for the relevant frequency as follows:

1> If the UE has not set up dedicated reselection information:

2> If the frequency supports the slice preferred/intended by the UE and the serving cell broadcasts an extra frequency priority value associated with the slice:

3> The UE may consider the priority value of the frequency to be a slice-related frequency priority.

2> If the frequency supports the slice preferred/intended by the UE and the serving cell does not broadcast additional frequency priority values associated with the slice:

3> The UE may consider the priority value of the frequency to be a predefined value (preferably the highest priority value).

1> When the UE receives dedicated reselection information that includes information indicating the slices supported by each frequency and/or information on the priority value for each slice:

2> If the frequency supports a slice preferred/intended by the UE and the dedicated priority/reselection information contains an extra frequency priority value associated with that slice:

3> The UE may regard the frequency priority value as a slice-related frequency priority value.

2> If the frequency in question supports a slice preferred/intended by the UE and the dedicated priority/reselection information does not contain an extra frequency priority value associated with the slice:

3> The UE may consider the priority value of the frequency to be a predefined value (preferably the highest priority value).

In step S1107, the UE may reselect a cell using the determined frequency priority value, that is, select the highest ranked cell at the frequency with the highest frequency priority value.

Various embodiments of the present disclosure may also be applied to control whether the UE is allowed to ignore the common priority by dedicated priority (the dedicated priority does not necessarily have to be a slice specific priority). Control may be applied per cell (i.e., all frequencies broadcast by a cell for which dedicated priority is provided) or on a per-frequency basis (i.e., by frequency-specific instructions).

Various embodiments of the present disclosure may also be applied to control whether the UE is allowed to apply the highest priority for a particular frequency that the UE prefers to obtain the desired service. For example, if the frequency supports the desired MBMS service or the desired sidelink (or V2X) service, the UE may be allowed to consider the frequency as having the highest reselection priority by default. However, if the priority for the frequency is specified in the system information within the cell, the UE within the cell cannot apply the highest priority to the frequency.

Figure 12 shows an example of a method performed by a BS according to an embodiment of the present disclosure.

Referring to FIG. 12, the BS may transmit one or more SS/PBCH blocks to the UE.

In step S1203, the BS may perform a random access procedure with the UE.

In step S1205, the BS may transmit priority control information to the UE to determine the priority value to be applied to the frequency for cell reselection among the first priority value and the second priority value.

A first priority value may apply to the frequency and a second priority value may be associated with the slice supported by the frequency. Priority control information may inform whether to apply a second priority value to the frequency for cell reselection.

The BS of FIG. 12 may be an example of the second device 220 of FIG. 2 , and thus the steps of the BS illustrated in FIG. 12 may be implemented by the second device 220 . For example, the processor 221 may be configured to control the transceiver 223 to transmit one or more SS/PBCH blocks to the UE. The processor 221 may be configured to perform a random access procedure with the UE. The processor 221 controls the transceiver 223 to transmit priority control information to the UE to determine the priority value to be applied to the frequency for cell reselection among the first priority value and the second priority value. It can be. A first priority value may apply to the frequency and a second priority value may be associated with the slice supported by the frequency. Priority control information may inform whether to apply a second priority value to the frequency for cell reselection.

Figure 13 shows a UE implementing an embodiment of the present disclosure. The invention described above for the UE side can also be applied to this embodiment. In FIG. 13 , the UE may be an example of the first device 210 shown in FIG. 2 .

The UE includes a processor 1310 (i.e., processor 211), a power management module 1311, a battery 1312, a display 1313, a keypad 1314, a subscriber identity module (SIM) card 1315, and memory ( 1320) (i.e., memory 212), a transceiver 1330 (i.e., transceiver 213), one or more antennas 1331, a speaker 1340, and a microphone 1341.

The processor 1310 may be configured to implement the suggested functions, procedures and/or methods described in this description. Layers of a wireless interface protocol may be implemented in the processor 1310. The processor 1310 may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and/or data processing devices. The processor 1310 may be an application processor (AP). The processor 1310 may include at least one digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulation and demodulation). Examples of the processor 1310 include the SNAPDRAGON ^™ series processor manufactured by Qualcomm®, the EXYNOS ^™ series processor manufactured by Samsung®, and the EXYNOS™ series processor manufactured by Apple®. There are processor series, HELIO ^TM series processors manufactured by MediaTek®, ATOM ^TM series processors manufactured by Intel®, or corresponding next-generation processors.

The processor 1310 may be configured to implement steps performed by the UE and/or the wireless device throughout the disclosure or may be configured to control the transceiver 1330.

The power management module 1311 manages power of the processor 1310 and/or the transceiver 1330. The battery 1312 supplies power to the power management module 1311. The display 1313 outputs the results processed by the processor 1310. The keypad 1314 receives input to be used by the processor 1310. The keypad 1314 may be visible on the display 1313. The SIM card 1315 is an integrated circuit for safely storing the International Mobile Subscriber Identity (IMSI) number and keys related thereto, which are used to identify and authenticate subscribers on mobile telephony devices (cell phones, computers, etc.). It is also possible to store contact information on many SIM cards.

The memory 1320 is operably connected to the processor 1310 and stores various information for operating the processor 1310. The memory 1320 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and/or other storage devices. When these embodiments are implemented as software, the techniques described in this disclosure may be implemented as modules (eg, procedures, functions, etc.) for performing the functions described in this disclosure. The module may be stored in the memory 1320 and executed by the processor 1310. The memory 1320 may be implemented within the processor 1310 or may be external to the processor 1310, in which case they may be communicatively connected to the processor 1310 through various means well known in the art. .

The transceiver 1330 is operable connected to the processor 1310 and transmits and/or receives wireless signals. The transceiver 1330 includes a transmitter and a receiver. The transceiver 1330 may include a base band circuit for processing radio frequency signals. The transceiver 1330 controls one or more antennas 1331 for transmitting and/or receiving wireless signals.

The speaker 1340 outputs sound-related results processed by the processor 1310. The microphone 1341 receives sound-related input for use by the processor 1310.

According to various embodiments, processor 1310 is configured to implement steps performed by the UE and/or wireless device in the present disclosure, or controls transceiver 1330 to implement steps performed by the UE and/or wireless device in the present disclosure. It can be set to implement the steps that are required. For example, the processor 1310 may be configured to control the transceiver 1330 to receive, from a first cell, a first priority value for a frequency and a second priority value associated with a slice supported by the frequency. . The processor 1310 may be configured to control the transceiver 1330 to receive priority control information from the second cell indicating whether to apply the second priority value to the frequency for cell reselection. The processor 1310 may be configured to determine a priority value to be applied to the frequency for cell reselection among the first priority value and the second priority value based on priority control information. The processor 1310 may be configured to perform cell reselection based on the determined priority value for the frequency.

Figure 14 shows an example of a wireless communication system to which the technical features of the present disclosure can be applied.

Referring to FIG. 14, the wireless communication system may include a first device 1410 (i.e., first device 210) and a second device 1420 (i.e., second device 220).

The first device 1410 may include at least one transceiver, such as transceiver 1411, and at least one processing chip, such as processing chip 1412. The processing chip 1412 may include at least one processor, such as processor 1413, and at least one memory, such as memory 1414. The memory may be operably connected to the processor 1413. The memory 1414 may store various types of information and/or instructions. The memory 1414 may store software code 1415 that, when executed by the processor 1413, implements instructions that perform the operations of the first device 910 described throughout the disclosure. For example, the software code 1415 may include instructions that, when executed by the processor 1413, perform the functions, procedures, and/or methods of the first device 1410 described throughout the disclosure. Software code 1415 that implements can be stored. For example, the software code 1415 may control the processor 1413 to perform one or more protocols. For example, the software code 1415 may control the processor 1413 to perform one or more layers of the wireless interface protocol.

The second device 1420 may include at least one transceiver, such as transceiver 1421, and at least one processing chip, such as processing chip 1422. The processing chip 1422 may include at least one processor, such as processor 1423, and at least one memory, such as memory 1424. The memory may be operably coupled to the processor 1423. The memory 1424 may store various types of information and/or instructions. The memory 1424 may include software code 1425 that, when executed by the processor 1423, implements instructions that perform the operations of the second device 1420 described throughout the disclosure. You can. For example, the software code 1425, when executed by the processor 1423, may be used to perform the functions, procedures, and/or methods of the second device 1420 described throughout the disclosure. Commands can be implemented. For example, software code 1425 may control the processor 1423 to perform one or more protocols. For example, the software code 1425 may control the processor 1423 to perform one or more layers of a wireless interface protocol.

According to various embodiments, the first device 1410 illustrated in FIG. 14 may include a wireless device. The wireless device may include a transceiver 1411 and a processing chip 1412. The processing chip 1412 may include a processor 1413 and a memory 1414. The memory 1414 may be functionally coupled to the processor 1413. Memory 1414 may store various types of information and/or instructions. Memory 1414 may store software code 1414 that, when executed by processor 1413, implements instructions to perform steps. The steps include: receiving, from a first cell, a first priority value for a frequency and a second priority value associated with a slice supported by the frequency; Receiving priority control information from a second cell indicating whether to apply a second priority value to the frequency for cell reselection; determining a priority value to be applied to the frequency for cell reselection among a first priority value and a second priority value based on priority control information; and performing cell reselection based on the determined priority value for the frequency.

According to various embodiments, a non-transitory computer-readable medium stores a plurality of instructions, which, when executed by a processor of a wireless device, cause the wireless device to perform steps, the steps comprising: : Receiving, from a first cell, a first priority value for a frequency and a second priority value associated with a slice supported by the frequency; Receiving priority control information from a second cell indicating whether to apply a second priority value to the frequency for cell reselection; determining a priority value to be applied to the frequency for cell reselection among a first priority value and a second priority value based on priority control information; and performing cell reselection based on the determined priority value for the frequency.

This disclosure may be applied to various future technologies such as AI, robotics, driverless/autonomous vehicles, and/or extended reality (XR).

<AI>

AI refers to artificial intelligence and/or the research methodology for creating it. Machine learning is a field of research methodology that defines and solves various problems addressed by AI. Machine learning can be defined as an algorithm that improves task performance through consistent experience with certain tasks.

An artificial neural network (ANN) is a model used in machine learning. This may mean an overall model with problem-solving capabilities consisting of artificial neurons (nodes) that form a network of synapses. ANN can be defined by connection patterns between neurons in different layers, a learning process to update model parameters, and/or an activation function to generate output values. An ANN may include an input layer, an output layer, and optionally one or more hidden layers. Each layer may include one or more neurons, and the ANN may include synapses connecting neurons. In an ANN, each neuron can output a sum of activation functions, weights, and bias inputs for the input signal through a synapse. Model parameters are parameters determined through learning and include the bias of neurons and/or the weight of synaptic connections. Hyperparameters refer to parameters to be set in the machine learning algorithm before learning, and include learning speed, number of iterations, minimum batch size, initialization function, etc. The purpose of ANN learning can be seen as determining model parameters that minimize the loss function. The loss function can be used as an indicator to determine optimal model parameters in the ANN learning process.

Machine learning can be divided into supervised learning, unsupervised learning, and reinforcement learning depending on the learning method. Supervised learning is a method of training an ANN using labels given to training data. A label is the answer (or result value) that the ANN must infer when training data is input into the ANN. Unsupervised learning can refer to a method of training an ANN without labels given to training data. Reinforcement learning may refer to a learning method in which an agent defined in the environment learns to select an action and/or sequence of actions that maximize the cumulative reward in each state.

When machine learning is implemented with a deep neural network (DNN) that includes multiple hidden layers among ANNs, it is also called deep learning. Deep learning is a part of machine learning. In the following description, machine learning is used to mean deep learning.

Figure 15 shows an example of an AI device to which the technical features of the present disclosure can be applied.

The AI device 1500 is a TV, projector, mobile phone, smartphone, desktop computer, laptop, digital broadcasting terminal, PDA, PMP, navigation device, tablet PC, wearable device, set-top box (STB), and digital multimedia broadcasting (DMB). It can be implemented as a static device or a portable device such as a receiver, radio, washing machine, refrigerator, digital signage, robot, vehicle, etc.

Referring to FIG. 15, the AI device 1500 includes a communication unit 1510, an input unit 1520, a learning processor 1530, a transmission unit 1540, an output unit 1550, a memory 1560, and a processor 1570. ) may include.

The communication unit 1510 may transmit and/or receive data from external devices, such as an AI device and an AI server using wired and/or wireless communication technology. For example, the communication unit 1510 may transmit and/or receive sensor information, user input, learning models, and control signals from an external device. Communication technologies used by the communication unit 1510 include Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA), LTE/LTE-A, 5G, WLAN, Wi-Fi, Bluetooth ^TM , It may include radio frequency identification (RFID), infrared data connectivity (IrDA), ZigBee, and/or near field communication (NFC).

The input unit 1520 can obtain various types of data. The input unit 1520 may include a camera for inputting video signals, a microphone for receiving audio signals, and a user input unit for receiving information from a user. Cameras and/or microphones may be treated as sensors, and signals obtained from the cameras and/or microphones may be referred to as data and/or sensor information. The input unit 1520 can obtain input data to be used when obtaining output using learning data and a learning model. The input unit 1520 may acquire raw input data, and in this case, the processor 1570 or the learning processor 1530 may extract features by pre-processing the input data.

The learning processor 1530 can learn a model composed of ANN using training data. ANN learned in this way can be called a learning model. The learning model can be used to infer result values for new input data rather than learning data, and these inferred values can be used as a basis for deciding what action to perform. The learning processor 1530 may perform AI processing together with the learning processor of the AI server. The learning processor 1530 may include memory integrated and/or implemented within the AI device 1500. Alternatively, the learning processor 1530 may be implemented using the memory 1560, an external memory directly connected to the AI device 1500, and/or a memory maintained within an external device.

The detection unit 1540 may use various sensors to obtain internal information of at least one AI device 1500, environmental information of the AI device 1500, and/or user information. Sensors included in the detection unit 1540 include a proximity sensor, an illumination sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, an optical sensor, a microphone, light detection, and May include range detection (LIDAR), and/or radar.

The output unit 1550 may generate output related to visual, auditory, tactile sensations, etc. The output unit 1550 may include a display unit for outputting visual information, a speaker for outputting auditory information, and/or a haptic module for outputting tactile information.

The memory 1560 can store data supporting various functions of the AI device 1500. For example, the memory 1560 may store input data, learning data, learning models, learning history, etc. acquired by the input unit 1520.

The processor 1570 may determine at least one executable operation of the AI device 1500 based on information determined and/or generated using a data analysis algorithm and/or a machine learning algorithm. The processor 1570 may again control the components of the AI device 1500 to perform the determined operation. The processor 1570 may request, query, receive, and/or utilize data from the processor 1530 and/or the memory 1560, and determine which of the predicted operations and/or the at least one executable operation is desirable. Components of the AI device 1500 can be controlled to execute actions. The processor 1570 can generate a control signal for controlling an external device, and can transmit this generated control signal to the external device when a secondary device needs to be linked to perform a determined operation. The processor 1570 may obtain information related to intent for the user input and determine the user's request based on the information related to the obtained intent. The processor 1570 may use a speech-to-text (STT) engine to convert at least one speech input into a text string and/or a natural language intent to obtain information related to intent corresponding to the user input. A natural language processing (NLP) engine can be used to obtain information related to. The at least one STT engine and/or NLP engine may be configured as an ANN, at least a portion of which is learned according to a machine learning algorithm. At least one STT engine and/or NLP engine may be trained by the learning processor 1530, trained by the learning processor of the AI server, or learned by distributed processing. The processor 1570 may collect history information including user feedback on operational content and/or operation of the AI device 1500, etc. The processor 1570 may store the collected history information in the memory 1560 and/or the learning processor 1530, and/or transmit it to an external device such as an AI server. The historical information collected in this way can be used to update the learning model. The processor 1570 may control at least some of the components of the AI device 1500 to run the application program stored in the memory 1560. Additionally, the processor 1570 can operate two or more components included in the AI device 1500 by combining each to drive an application program.

Figure 16 shows an example of an AI system to which the technical features of the present disclosure can be applied.

Referring to FIG. 16, in the AI system, at least one AI server 1620, a robot 1610a, an autonomous vehicle 1610b, an XR device 1610c, a smartphone 1610d, and/or a home appliance 1610e ) is connected to the cloud network (1600). These robots 1610a, unmanned vehicles 1610b, XR devices 1610c, smartphones 1610d, and/or home appliances 1610e to which AI technology is applied may be referred to as AI devices 1610a to 1610e.

The cloud network 1600 may refer to a network that forms part of the cloud computing infrastructure and/or a network that exists within the cloud computing infrastructure. The cloud network 1600 may be configured using a 3G network, 4G or LTE network, and/or 5G network. That is, each of the devices 1610a to 1610e and 1620 constituting the AI system may be interconnected through the cloud network 1600. In particular, devices 1610a to 1610e and 1620 may each communicate with each other through a base station, but may also communicate directly with each other without using a base station.

The AI server 1620 may include a server for performing AI processing and a server for performing tasks on big data. The AI server 1620 supports at least one or more AI devices constituting the AI system through the cloud network 1600, that is, the robot 1610a, the autonomous vehicle 1610b, and the XR device 1610c. , It is connected to the smartphone (1610d) and/or the home appliance (1610e) and can process at least part of the AI processing of the connected AI devices (1610a to 1610e). The AI server 1620 may learn an ANN according to a machine learning algorithm instead of the AI devices 1610a to 1610e, and may directly store the learning model and/or transmit it to the AI devices 1610a to 1610e. You can. The AI server 1620 receives input data from the AI devices 1610a to 1610e, infers a result value for the received input data using the learning model, and reacts and performs a response based on the inferred result value. /Or a control command may be generated and the generated data may be transmitted to the AI devices 1610a to 1610e. As another method, the AI devices 1610a to 1610e may directly infer a result value for input data using a learning model and generate a reaction and/or control command based on the inferred result value. .

Various embodiments of the AI devices 1610a to 1610e to which the technical features of the present disclosure can be applied will be described. The AI devices 1610a to 1610e shown in FIG. 16 can be viewed as specific embodiments of the AI device 1500 shown in FIG. 15.

The present disclosure can have a variety of beneficial effects.

For example, each cell can control whether the UE's preference/intention for a particular slice is applicable to cell reselection, thereby increasing network controllability over the UE's camping frequency.

In light of the example systems described in this disclosure, methodologies that may be implemented in accordance with the subject matter of this disclosure have been described with reference to several flow diagrams. For simplicity of explanation, these methodologies have been shown and described as a series of steps or blocks, and it is to be understood and appreciated that the claimed subject matter is not limited by the order of such steps or blocks, and that some steps may be different from each other. It may occur in sequence or may be performed concurrently with other steps depicted and described in this disclosure. Additionally, one of ordinary skill in the art will recognize that the steps illustrated in the flowchart are not exclusive and that other steps may be included or one or more steps may be deleted from the flowchart without affecting the scope of the present disclosure. You will be able to understand it.

The claims in this disclosure can be combined in various ways. For example, technical features in the method claims of the present disclosure may be combined to be implemented or performed in a device, and technical features in the device claims may be combined to be implemented or performed in a method. Additionally, technical features in the method claims and device claims may be combined to be implemented or performed in the device. Additionally, technical features in the method claims and device claims may be combined to be implemented or performed in the method. Other implementations are within the scope of the following claims.

Claims (18)

In a method performed by a user equipment (UE) in a wireless communication system,
Receiving, from a first cell, a first priority value for a frequency and a second priority value associated with a slice supported by the frequency;
Receiving priority control information from a second cell indicating whether to apply the second priority value to the frequency for cell reselection;
determining a priority value to be applied to the frequency for cell reselection among the first priority value and the second priority value based on the priority control information; and
Method comprising performing the cell reselection based on the determined priority value for the frequency. The method of claim 1, further comprising receiving slice information from a network indicating one or more slices supported by the frequency,
The one or more slices include the slice,
The slice information includes a slice identifier (ID) of the slice. The method of claim 1, further comprising: receiving settings for a frequency list including the frequency from a network,
The priority control information informs whether to apply the second priority value to the frequency for cell reselection, and applies the second priority value to one or more other frequencies in the frequency list for cell reselection. A method that doesn't tell you whether to apply it or not. The method of claim 1, further comprising: receiving settings for a frequency list including the frequency from a network,
The priority control information indicates whether to apply the second priority value to all frequencies in the frequency list for cell reselection. The method of claim 1, wherein the priority control information informs whether to apply the second priority value to the frequency for the slice, and applies the second priority value to the frequency for one or more other slices supported by the slice. A method that doesn't tell you whether to apply the value or not. The method of claim 1, wherein determining a priority value to be applied to the frequency comprises:
i) the priority control information informs to apply the first priority value to the frequency, or ii) apply the first priority value to the frequency based on the slice is not preferred by the UE. A method that includes the steps of deciding what to do. The method of claim 1, wherein determining a priority value to be applied to the frequency comprises:
i) the priority control information informs to apply the second priority value to the frequency, and ii) determines to apply the second priority value to the frequency based on the slice being preferred by the UE. A method comprising the steps of: The method of claim 1, wherein the priority value to apply to the frequency is determined as the highest value in a frequency list set by a network based on the slice being preferred by the UE. The method according to claim 1, wherein performing the cell reselection comprises:
determining a highest priority frequency in the frequency list set by a network based on comparing a priority value for the frequency with a priority value for at least one frequency in the frequency list; and
A method comprising performing cell reselection with the highest ranked cell at the highest priority frequency. The method of claim 1, wherein the UE communicates with at least one of user equipment other than the UE, a network, or an autonomous vehicle. In UE (user equipment) in a wireless communication system,
Transmitter and receiver,
memory,
At least one processor functionally coupled to the transceiver and the memory, wherein the at least one processor:
Control the transceiver to receive, from a first cell, a first priority value for a frequency and a second priority value associated with a slice supported by the frequency,
Controlling the transceiver to receive priority control information from a second cell indicating whether to apply the second priority value to the frequency for cell reselection,
Based on the priority control information, determine a priority value to be applied to the frequency for cell reselection among the first priority value and the second priority value,
A UE configured to perform the cell reselection based on the determined priority value for the frequency. The method of claim 11, wherein the at least one processor is configured to control the transceiver to receive slice information from the network indicating one or more slices supported by the frequency,
The one or more slices include the slice,
The slice information includes a slice identifier (ID) of the slice. The method of claim 11, wherein the at least one processor is configured to: i) the priority control information informs to apply the first priority value to the frequency, or ii) the slice is not preferred by the UE. UE configured to determine to apply the first priority value to the frequency. The method of claim 11, wherein the at least one processor is configured to i) the priority control information informs to apply the second priority value to the frequency, and ii) the second slice based on the slice being preferred by the UE. A UE configured to determine a priority value to apply to the frequency. A processor for a user equipment (UE) in a wireless communication system, wherein a memory of the UE stores software code that implements instructions that, when executed by the processor, perform operations, the operations being:
Receiving, from a first cell, a first priority value for a frequency and a second priority value associated with a slice supported by the frequency;
Receiving priority control information from a second cell indicating whether to apply the second priority value to the frequency for cell reselection;
determining a priority value to be applied to the frequency for cell reselection among the first priority value and the second priority value based on the priority control information; and
A processor comprising performing the cell reselection based on the determined priority value for the frequency. A non-transitory computer-readable medium storing a plurality of instructions, wherein when executed by a processor of a user equipment (UE), the plurality of instructions cause the UE to:
receive, from a first cell, a first priority value for a frequency and a second priority value associated with a slice supported by the frequency;
Receiving priority control information from a second cell indicating whether to apply the second priority value to the frequency for cell reselection,
Based on the priority control information, determine a priority value to be applied to the frequency for cell reselection among the first priority value and the second priority value,
A non-transitory computer-readable medium for performing the cell reselection based on the determined priority value for the frequency. In a method performed by a base station (BS) in a wireless communication system,
Transmitting one or more synchronization signal/physical broadcast channel (SS/PBCH) blocks to user equipment (UE);
performing a random access procedure with the UE; and
Transmitting priority control information for determining a priority value to be applied to a frequency for cell reselection among the first priority value and the second priority value to the UE,
the first priority value applies to the frequency and the second priority value relates to a slice supported by the frequency,
The priority control information indicates whether to apply the second priority value to the frequency for cell reselection. In a base station (BS) in a wireless communication system,
Transmitter and receiver,
memory,
At least one processor functionally coupled to the transceiver and the memory, wherein the at least one processor:
Control the transceiver to transmit one or more SS/PBCH (synchronization signal/physical broadcast channel) blocks to UE (user equipment),
Perform a random access procedure with the UE,
Configured to control the transceiver to transmit priority control information to the UE to determine a priority value to be applied to a frequency for cell reselection among a first priority value and a second priority value,
the first priority value applies to the frequency and the second priority value relates to a slice supported by the frequency,
The priority control information is a BS that informs whether to apply the second priority value to the frequency for cell reselection.

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