KR20220103019A - Method and apparatus for slice based cell selection procedure in wireless communication system - Google Patents

Abstract

The present invention relates to communication technique and system for combining a 5G communication system for supporting higher data transfer rates than a 4G system with IoT technology. The present invention may be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security and safety-related services, etc.) based on 5G communication technology and IoT-related technology. The present invention relates to a method for handling slice-based cell selection and slice-based cell reselection procedures in a wireless communication system. The method may include the steps of: receiving cell selection-related signal strength and slice setting information, and cell reselection-related signal strength and slice setting information from a base station; performing a cell selection procedure using the cell selection-related signal strength and slice setting information; and performing a cell reselection procedure using the cell reselection-related signal strength and slice setting information.

Description

Method and apparatus for performing slice-based cell selection procedure in a wireless communication system {METHOD AND APPARATUS FOR SLICE BASED CELL SELECTION PROCEDURE IN WIRELESS COMMUNICATION SYSTEM}

The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for a slice-based cell selection and cell reselection procedure of a terminal in a wireless communication system.

Efforts are being made to develop an ^{improved 5 th generation} (5G) communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after commercialization of the 4G (4th generation) communication system. For this reason, the 5G communication system or the pre-5G communication system is called a 4G network after (Beyond 4G Network) communication system or an LTE (Long Term Evolution) system after (Post LTE) system.

In order to achieve a high data rate, the 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band). In order to alleviate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, in the 5G communication system, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, for network improvement of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud radio access network, cloud RAN), an ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and reception interference cancellation (interference cancellation) Technology development is underway.

In addition, in the 5G system, Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), which are advanced coding modulation (Advanced Coding Modulation, ACM) methods, and Filter Bank Multi Carrier (FBMC), an advanced access technology, ), Non Orthogonal Multiple Access (NOMA), and Sparse Code Multiple Access (SCMA) are being developed.

On the other hand, the Internet is evolving from a human-centered connection network where humans create and consume information to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. Internet of Everything (IoE) technology, which combines big data processing technology through connection with cloud servers, etc. with IoT technology, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. , M2M), and MTC (Machine Type Communication) are being studied. In the IoT environment, an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects and creates new values in human life can be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, advanced medical service, etc. can be applied to

Accordingly, various attempts are being made to apply the 5G communication system to the IoT network. For example, technologies such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) are implemented by 5G communication technologies such as beamforming, MIMO, and array antenna. will be. The application of a cloud radio access network (cloud RAN) as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

Meanwhile, in 5G, network slicing technology has been introduced. Each network slice refers to a separate end-to-end network tailored to meet the various requirements requested by a specific application.

The present disclosure provides an apparatus and method for a terminal to perform a cell selection procedure based on slice information in a wireless communication system.

Also, according to an embodiment of the present disclosure, an apparatus and method are provided for a terminal to perform a cell reselection procedure based on slice information in a wireless communication system.

Also, according to an embodiment of the present disclosure, an apparatus and method for a terminal to obtain slice information from information for a cell selection procedure and information for a cell reselection procedure in a wireless communication system are provided.

According to an embodiment of the present disclosure, in a method for a terminal to perform a cell selection procedure based on slice information in a wireless communication system, the terminal determines slice information that a cell can support from cell selection procedure information obtained from a base station. and performing a procedure for selecting a cell. The method for the UE to perform a cell selection procedure may include selecting a cell by applying at least one or a combination of slice information and signal strength information included in the cell selection procedure information.

According to an embodiment of the present disclosure, in a method for a terminal to perform a cell reselection procedure based on slice information in a wireless communication system, the terminal obtains slice information that a cell can support from cell reselection procedure information obtained from a base station. It may include a step of determining and performing a procedure of selecting a cell. The method for the UE to perform a cell reselection procedure may include selecting a cell by applying at least one or a combination of slice information and signal strength information included in the cell reselection procedure information.

According to the present disclosure, when the terminal performs cell selection and cell reselection, the terminal may determine whether the requested service can be supported through the corresponding cell based on network slice information. That is, based on the network slice information, it is possible to determine whether cell selection and cell reselection can be performed, so that the service required by the UE is provided without delay or the service required by the UE is provided. The access procedure can be handled efficiently.

Effects obtainable in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present disclosure belongs from the description below. will be.

The above and other objects, features and advantages of the present disclosure will become clearer through the following description of embodiments of the present disclosure with reference to the accompanying drawings.
1 is a diagram illustrating a wireless communication system according to an embodiment of the present disclosure.
2 is a diagram illustrating a configuration of a base station in a wireless communication system according to an embodiment of the present disclosure.
3 is a diagram illustrating a configuration of a terminal in a wireless communication system according to an embodiment of the present disclosure.
4 is a diagram illustrating a configuration of a communication unit in a wireless communication system according to an embodiment of the present disclosure.
5 is a diagram illustrating a structure of a radio time-frequency resource of a wireless communication system according to an embodiment of the present disclosure.
6A is a diagram illustrating an operation of a terminal for determining an option of a cell selection procedure or a cell reselection procedure according to an embodiment of the present disclosure.
6B is a diagram illustrating a slice-based cell selection operation of a UE according to an embodiment of the present disclosure.
7 is a diagram illustrating an operation in which a UE performs a cell selection procedure according to various embodiments of the present disclosure.
8 is a diagram illustrating an operation in which a UE performs a cell selection procedure according to various embodiments of the present disclosure.
9 is a diagram illustrating an operation in which a terminal performs a cell selection procedure according to various embodiments of the present disclosure.
10 is a diagram illustrating an operation in which a UE performs a cell selection procedure according to various embodiments of the present disclosure.
11 is a diagram illustrating an operation in which a terminal performs a cell selection procedure according to various embodiments of the present disclosure.

Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. At this time, it should be noted that in the accompanying drawings, the same components are denoted by the same reference numerals as much as possible. In addition, detailed descriptions of well-known functions and configurations that may obscure the gist of the present disclosure will be omitted.

In describing the embodiments in the present specification, descriptions of technical contents that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure without obscuring the gist of the present disclosure by omitting unnecessary description.

For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings. In addition, the size of each component does not fully reflect the actual size. In each figure, the same or corresponding elements are assigned the same reference numerals.

Advantages and features of the present disclosure, and methods for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, and only the present embodiments allow the disclosure of the present disclosure to be complete, and common knowledge in the technical field to which the present disclosure belongs It is provided to fully inform those who have the scope of the disclosure, and the present disclosure is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

At this time, it will be understood that each block of the flowchart diagrams and combinations of the flowchart diagrams may be performed by computer program instructions. These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions performed by the processor of the computer or other programmable data processing equipment are not described in the flowchart block(s). It creates a means to perform functions. These computer program instructions may also be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory. It is also possible for the instructions stored in the flowchart block(s) to produce an article of manufacture containing instruction means for performing the function described in the flowchart block(s). The computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It is also possible that instructions for performing the processing equipment provide steps for performing the functions described in the flowchart block(s).

Additionally, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is also possible for the functions recited in the blocks to occur out of order. For example, it is possible that two blocks shown in succession are actually performed substantially simultaneously, or that the blocks are sometimes performed in the reverse order according to the corresponding function.

At this time, the term '~ unit' used in this embodiment means software or hardware components such as FPGA or ASIC, and '~ unit' performs certain roles. However, '-part' is not limited to software or hardware. '~unit' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors. Thus, as an example, '~' denotes components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. In addition, components and '~ units' may be implemented to play one or more CPUs in a device or secure multimedia card.

In describing the embodiments of the present disclosure in detail, the radio access network New RAN (NR) and the core network packet core (5G System, or 5G Core Network, or NG Core: Next Generation Core) is the main object, but the main gist of the present disclosure is applicable to other communication systems having a similar technical background with slight modifications within the scope not significantly departing from the scope of the present disclosure, which It will be possible at the discretion of a person having technical knowledge skilled in the technical field of the present disclosure.

In the 5G system, in order to support network automation, a network data collection and analysis function (NWDAF), which is a network function that provides a function to analyze and provide data collected from a 5G network network, may be defined. The NWDAF can collect/store/analyze information from the 5G network and provide the results to an unspecified network function (NF), and the analysis results can be used independently by each NF.

For convenience of description below, some terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP) standard (standards of 5G, NR, LTE, or similar systems) may be used. However, it is not limited by the terms and names of the present disclosure, and the same may be applied to systems conforming to other standards.

Hereinafter, the present disclosure relates to an apparatus and method for performing a cell selection procedure and a cell reselection procedure based on cell selection information including slice information and cell reselection information including slice information obtained by a terminal from a base station in a wireless communication system. it's about Specifically, the present disclosure includes a cell selection procedure in which the terminal selects a cell based on at least one or a combination of slice information and signal strength information included in the cell selection information obtained from the base station and cell reselection information obtained from the base station The present invention relates to an apparatus and method for performing a cell reselection procedure based on at least one or a combination of slice information and signal strength information.

Terms that refer to signals, terms that refer to channels, terms that refer to control information, terms that refer to network entities, and terms that refer to components of devices used in the following description are for convenience of description. it is exemplified Therefore, it is not limited to the terms used in the present disclosure, and other terms referring to objects having equivalent technical meanings may be used.

In the following description, a physical channel and a signal may be used interchangeably with data or a control signal. For example, a physical downlink shared channel (PDSCH) is a term referring to a physical channel through which data is transmitted, but the PDSCH may also be used to refer to data. That is, in the present disclosure, an expression 'transmitting a physical channel' may be interpreted equivalently to an expression 'transmitting data or a signal through a physical channel'.

Hereinafter, in the present disclosure, higher signaling refers to a signal transmission method in which a base station is transmitted to a terminal using a downlink data channel of a physical layer, or from a terminal to a base station using an uplink data channel of a physical layer. Upper signaling may be understood as radio resource control (RRC) signaling or medium access control (MAC) control element (CE).

In addition, in the present disclosure, in order to determine whether a specific condition is satisfied or fulfilled, an expression of more than or less than is used, but this is only a description to express an example, and more or less description is excluded. not to do Conditions described as 'more than' may be replaced with 'more than', conditions described as 'less than', and conditions described as 'more than and less than' may be replaced with 'more than and less than'.

In addition, although the present disclosure describes exemplary embodiments using terms used in some communication standards (eg, 3rd Generation Partnership Project (3GPP)), this is only an example for description. Embodiments of the present disclosure may be easily modified and applied in other communication systems.

1 is a diagram illustrating a wireless communication system according to an embodiment of the present disclosure.

1 illustrates a base station 110 , a terminal 120 , and a terminal 130 as some of nodes using a wireless channel in a wireless communication system. 1 shows only one base station, other base stations identical or similar to the base station 110 may be further included.

The base station 110 is a network infrastructure that provides wireless access to the terminals 120 and 130 . The base station 110 has coverage defined as a certain geographic area based on a distance capable of transmitting a signal. In addition to the base station (base station), the base station 110 includes an 'access point (AP)', an 'eNodeB (eNodeB)', a '5G node (5th generation node)', a 'next generation nodeB' , gNB)', 'wireless point', 'transmission/reception point (TRP)', or other terms having an equivalent technical meaning.

Each of the terminal 120 and the terminal 130 is a device used by a user, and performs communication with the base station 110 through a wireless channel. The link from the base station 110 to the terminal 120 or the terminal 130 is downlink (DL), and the link from the terminal 120 or the terminal 130 to the base station 110 is uplink (UL). ) is called. In some cases, at least one of the terminal 120 and the terminal 130 may be operated without the user's involvement. That is, at least one of the terminal 120 and the terminal 130 is a device that performs machine type communication (MTC) and may not be carried by the user. Each of the terminal 120 and the terminal 130 is a 'user equipment (UE)', a 'mobile station', a 'subscriber station', a 'remote terminal other than a terminal. )', 'wireless terminal', or 'user device' or other terms having an equivalent technical meaning.

The base station 110 , the terminal 120 , and the terminal 130 may transmit and receive radio signals in millimeter wave (mmWave) bands (eg, 28 GHz, 30 GHz, 38 GHz, and 60 GHz). In this case, in order to improve the channel gain, the base station 110 , the terminal 120 , and the terminal 130 may perform beamforming. Here, the beamforming may include transmit beamforming and receive beamforming. That is, the base station 110 , the terminal 120 , and the terminal 130 may impart directivity to a transmission signal or a reception signal. To this end, the base station 110 and the terminals 120 and 130 may select the serving beams 112, 113, 121, and 131 through a beam search or beam management procedure. . After the serving beams 112, 113, 121, and 131 are selected, subsequent communication may be performed through a resource that is in a quasi co-located (QCL) relationship with the resource that has transmitted the serving beams 112, 113, 121, 131. Can be performed. have.

If the large-scale characteristics of the channel carrying the symbol on the first antenna port can be inferred from the channel carrying the symbol on the second antenna port, then the first antenna port and the second antenna port are said to be in a QCL relationship. can be evaluated. For example, a wide range of characteristics include delay spread, Doppler spread, Doppler shift, average gain, average delay, spatial receiver parameter. may include at least one of

The base station and the terminal are connected through the Uu interface. Uplink (UL) refers to a radio link through which the terminal transmits data or control signals to the base station, and downlink (DL) refers to a radio link through which the base station transmits data or control signals to the user equipment.

2 is a diagram illustrating a configuration of a base station in a wireless communication system according to an embodiment of the present disclosure.

The configuration shown in FIG. 2 may be understood as a configuration of the base station 110 . Terms such as '... unit' and '... group' used below mean a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software. have.

Referring to FIG. 2 , the base station 110 includes a wireless communication unit 210 , a backhaul communication unit 220 , a storage unit 230 , and a control unit 240 . However, the components of the base station are not limited to the above-described example. For example, the base station may include more or fewer components than the above-described components. In addition, the wireless communication unit 210 , the backhaul communication unit 220 , the storage unit 230 , and the control unit 240 may be implemented in the form of a single chip. Also, the controller 240 may include one or more processors.

The wireless communication unit 210 performs functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 210 performs a function of converting between a baseband signal and a bit stream according to a physical layer standard of the system. For example, when transmitting data, the wireless communication unit 210 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the wireless communication unit 210 restores the received bit stream by demodulating and decoding the baseband signal.

In addition, the wireless communication unit 210 up-converts the baseband signal into a radio frequency (RF) band signal, transmits the signal through the antenna, and downconverts the RF band signal received through the antenna into a baseband signal. To this end, the wireless communication unit 210 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), an analog to digital converter (ADC), and the like. Also, the wireless communication unit 210 may include a plurality of transmission/reception paths. Furthermore, the wireless communication unit 210 may include at least one antenna array composed of a plurality of antenna elements.

In terms of hardware, the wireless communication unit 210 may be composed of a digital unit and an analog unit, and the analog unit includes a plurality of sub-units according to operating power, operating frequency, etc. can be composed of The digital unit may be implemented by at least one processor (eg, a digital signal processor (DSP)).

The wireless communication unit 210 transmits and receives signals as described above. Accordingly, all or part of the wireless communication unit 210 may be referred to as a 'transmitter', a 'receiver', or a 'transceiver'. In addition, in the following description, transmission and reception performed through a wireless channel are used in the meaning of including processing as described above by the wireless communication unit 210 .

The backhaul communication unit 220 provides an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 220 converts a bit string transmitted from the base station 110 to another node, for example, another access node, another base station, an upper node, a core network, etc. into a physical signal, and is received from another node. Converts a physical signal into a bit string.

The storage unit 230 stores data such as a basic program, an application program, and setting information for the operation of the base station 110 . The storage unit 230 may be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. In addition, the storage unit 230 provides the stored data according to the request of the control unit 240 .

The controller 240 controls overall operations of the base station 110 . For example, the control unit 240 transmits and receives a signal through the wireless communication unit 210 or through the backhaul communication unit 220 . In addition, the control unit 240 writes and reads data in the storage unit 230 . In addition, the control unit 240 may perform functions of a protocol stack required by the communication standard. According to another implementation example, the protocol stack may be included in the wireless communication unit 210 . To this end, the controller 240 may include at least one processor. According to embodiments, the controller 240 may control the base station 110 to perform operations according to embodiments to be described later.

3 is a diagram illustrating a configuration of a terminal in a wireless communication system according to an embodiment of the present disclosure.

The configuration shown in FIG. 3 may be understood as a configuration of the terminal 120 . Terms such as '... unit' and '... group' used below mean a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software. have.

Referring to FIG. 3 , the terminal 120 includes a communication unit 310 , a storage unit 320 , and a control unit 330 . However, the components of the terminal 120 are not limited to the above-described example. For example, the terminal 120 may include more or fewer components than the aforementioned components. In addition, the communication unit 310 , the storage unit 320 , and the control unit 330 may be implemented in the form of a single chip. Also, the controller 330 may include one or more processors.

The communication unit 310 performs functions for transmitting and receiving signals through a wireless channel. For example, the communication unit 310 performs a function of converting between a baseband signal and a bit stream according to a physical layer standard of the system. For example, when transmitting data, the communication unit 310 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when data is received, the communication unit 310 restores the received bit stream by demodulating and decoding the baseband signal. In addition, the communication unit 310 up-converts the baseband signal into an RF band signal, transmits the signal through the antenna, and downconverts the RF band signal received through the antenna into a baseband signal. For example, the communication unit 310 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.

Also, the communication unit 310 may include a plurality of transmission/reception paths. Furthermore, the communication unit 310 may include at least one antenna array including a plurality of antenna elements. In terms of hardware, the communication unit 310 may include a digital circuit and an analog circuit (eg, a radio frequency integrated circuit (RFIC)). Here, the digital circuit and the analog circuit may be implemented as one package. Also, the communication unit 310 may include a plurality of RF chains. Furthermore, the communication unit 310 may perform beamforming.

The communication unit 310 transmits and receives signals as described above. Accordingly, all or part of the communication unit 310 may be referred to as a 'transmitter', 'receiver', or 'transceiver'. In addition, in the following description, transmission and reception performed through a wireless channel are used in the meaning of including processing as described above by the communication unit 310 .

The storage unit 320 stores data such as a basic program, an application program, and setting information for the operation of the terminal 120 . The storage unit 320 may be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. In addition, the storage unit 320 provides the stored data according to the request of the control unit 330 .

The controller 330 controls overall operations of the terminal 120 . For example, the control unit 330 transmits and receives signals through the communication unit 310 . In addition, the control unit 330 writes and reads data in the storage unit 320 . And, the control unit 330 may perform the functions of the protocol stack required by the communication standard. To this end, the controller 330 may include at least one processor or microprocessor, or may be a part of the processor. Also, a part of the communication unit 310 and the control unit 330 may be referred to as a communication processor (CP). According to embodiments, the controller 330 may control the terminal 120 to perform operations according to embodiments to be described later.

4 is a diagram illustrating a configuration of a communication unit in a wireless communication system according to an embodiment of the present disclosure.

4 shows an example of a detailed configuration of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. 3 . Specifically, FIG. 4 shows components for performing beamforming as a part of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. 3 .

Referring to FIG. 4 , the wireless communication unit 210 or the communication unit 310 includes an encoding and modulation unit 402 , a digital beamforming unit 404 , a plurality of transmission paths 406-1 to 406-N, and an analog beam. and a forming unit 408 .

The encoding and modulation unit 402 performs channel encoding. For channel encoding, at least one of a low density parity check (LDPC) code, a convolution code, and a polar code may be used. The encoder and modulator 402 generates modulation symbols by performing constellation mapping.

The digital beamformer 404 performs beamforming on a digital signal (eg, modulation symbols). To this end, the digital beamformer 404 multiplies the modulation symbols by beamforming weights. Here, the beamforming weights are used to change the magnitude and phase of a signal, and may be referred to as a 'precoding matrix', a 'precoder', or the like. The digital beamformer 404 outputs digital beamformed modulation symbols to the plurality of transmission paths 406-1 to 406-N. In this case, according to a multiple input multiple output (MIMO) transmission technique, modulation symbols may be multiplexed or the same modulation symbols may be provided to a plurality of transmission paths 406-1 to 406-N.

The plurality of transmission paths 406 - 1 to 406 -N convert digital beamformed digital signals into analog signals. To this end, each of the plurality of transmission paths 406 - 1 to 406 -N may include an inverse fast fourier transform (IFFT) calculator, a cyclic prefix (CP) inserter, a DAC, and an up converter. The CP insertion unit is for an orthogonal frequency division multiplexing (OFDM) scheme, and may be excluded when another physical layer scheme (eg, filter bank multi-carrier (FBMC)) is applied. That is, the plurality of transmission paths 406 - 1 to 406 -N provide an independent signal processing process for a plurality of streams generated through digital beamforming. However, depending on the implementation method, some of the components of the plurality of transmission paths 406 - 1 to 406 -N may be used in common.

The analog beamformer 408 performs beamforming on an analog signal. To this end, the digital beamforming unit 404 multiplies the analog signals by beamforming weights. Here, the beamforming weights are used to change the magnitude and phase of the signal. Specifically, the analog beamformer 440 may be variously configured according to a connection structure between the plurality of transmission paths 406 - 1 to 406 -N and antennas. For example, each of the plurality of transmission paths 406 - 1 to 406 -N may be connected to one antenna array. As another example, the plurality of transmission paths 406 - 1 to 406 -N may be connected to one antenna array. As another example, the plurality of transmission paths 406 - 1 to 406 -N may be adaptively connected to one antenna array or connected to two or more antenna arrays.

5 is a diagram illustrating a structure of a radio time-frequency resource of a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 5 , in the radio resource domain, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain is an OFDM symbol (OFDM symbol) or a DFT-S-OFDM symbol (DFT-S-OFDM symbol), and N _symb OFDM symbols or DFT-S-OFDM symbols 530 are one is included in the slot 505 of Unlike the slot, the length of the subframe in the NR system may be defined as 1.0 ms, and the length of the radio frame 500 may be defined as 10 ms. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth may include a total of N _BW subcarriers 525 . Specific numerical values such as N _symb and N _BW may be variably applied depending on the system.

The basic unit of the time-frequency resource region is a resource element (RE) 510, which may be represented by an OFDM symbol index or a DFT-S-OFDM symbol index and a subcarrier index. A resource block (RB 515) may be defined as N _RB consecutive subcarriers 520 in the frequency domain. In general, the minimum transmission unit of data is an RB unit, and in an NR system, generally N _symb = 14, N _RB = 12.

The structure of the radio time-frequency resource as shown in FIG. 5 may be applied to the Uu interface.

Meanwhile, one network may provide one or more vertical slices and services. Table 1 shows examples of vertical slices/services and SST (Slice/Service Type) values of corresponding slices/services.

Slice/Service type (SST) SST value Characteristics eMBB One Slice suitable for the handling of 5G enhanced Mobile Broadband. URLLC 2 Slice suitable for the handling of ultra-reliable low latency communications. mIoT 3 Slice suitable for the handling of massive IoT. V2X 4 Slice suitable for the handling of V2X services.

The UE may be configured with one or more slice information. This slice information may be configured as a slice configured in the terminal. When the need to receive a service occurs, the terminal may select a slice corresponding to the service from the configured slice. In this case, the slice may correspond to a slice desired by the UE. A slice desired by the UE may correspond to one slice occurring during cell selection or cell reselection. The configured slice set in the terminal may include a default slice and a preferred slice. That is, the network entity controlling the slice of the terminal may set which slice is the default slice among the configured slices of the terminal and which slice is the preferred slice among the configured slices to the terminal. When it is determined that the frequency or cell does not support the intended slice required when the UE performs the cell selection procedure or performs the cell reselection procedure, the UE has a default slice or preferred slice among its configured slices, and the default If it is set to select or reselect a cell supporting a slice corresponding to slice or preferred slice, a cell supporting a slice corresponding to default slice or preferred slice can be selected or reselected. When the UE selects or reselects a cell supporting a slice corresponding to the default slice or preferred slice instead of the intended slice, the UE selects or reselects the desired slice information and the slice selected at the time of cell selection/reselection (default slice or preferred slice) slice) may be reported to a network entity or a base station. If the UE cannot find a frequency or cell supporting any slice among the intended slice, default slice, and preferred slice, the UE may perform a connection establishment procedure through a general cell selection or cell reselection procedure, in this case , the UE may report at least one or a combination of desired slice information, default slice, and preferred slice to a network entity or a base station. Through the report information of the terminal, the network or the base station determines whether the terminal desired (intended) slice information, the default slice or preferred slice information of the terminal, the slice information selected when the terminal selects a cell or a cell reselection, whether the selected slice is the default slice, preferred It is possible to obtain at least one or a combination of information on whether it is a slice. Based on the report information of the terminal, the network entity or the base station redirects to a cell or frequency that supports at least one of an intended slice, a default slice, and a preferred slice, or provides a carrier aggregation (CA). Alternatively, DC (dual connectivity) may be provided, or handover may be performed. At this time, the network entity or the base station is the target cell that the terminal redirects, the target cell for CA, the target cell for DC, or the desired (intended) slice reported from the terminal to the base station / network entity of the target cell performing the handover, the default of the terminal Information on at least one or a combination of slice or preferred slice information, slice information selected when the UE selects a cell or cell reselection, and whether the selected slice is a default slice or a preferred slice, may be transmitted through an inter-node message.

The operation of the terminal reporting the intended slice, default slice, and preferred slice to the base station/network is (A) a cell selection operation using at least one of an intended slice, default slice, and preferred slice, or A case in which the cell reselection operation is set and (B) a case in which the terminal acquires a system information block message including slice-based cell selection information and/or a system information block message including slice-based cell reselection information from the base station It can be performed if all are satisfied. The operation of the terminal reporting the intended slice, default slice, and preferred slice to the base station/network is a cell selection operation or cell reselection operation using at least one of the terminal intended (intended) slice, default slice, and preferred slice It can be performed if it is set to do so. The operation of the terminal reporting the intended slice, default slice, and preferred slice to the base station/network includes a system information block message including slice-based cell selection information and/or slice-based cell reselection information from the base station This may be performed when obtaining a system information block message to In the case of a terminal or a base station that does not support the slice-based cell selection operation or the slice-based cell reselection operation, the terminal does not support the operation of reporting the intended slice, default slice, or preferred slice to the base station/network. That is, in the case of a terminal that does not support a slice-based cell selection operation or a slice-based cell reselection operation, or in the case of a base station, the terminal may perform an operation of reporting configured slice information to the base station/network as before. At this time, based on the terminal's configured slice information report, the base station/network sends the terminal's configured slice to the target cell redirected by the terminal, the CA target cell, the DC target cell, or the base station/network entity of the handover target cell. Information can be passed through inter-node messages.

Hereinafter, with reference to FIG. 6A, the terminal may be referred to by terms having the same or similar meaning, such as a system information block message (or system information, system information block, system information block (SIB)) obtained from the base station. ) to determine whether to provide slice-based cell selection information and/or slice-based cell reselection information to determine whether to perform a slice-based cell selection procedure/cell reselection procedure or an existing cell selection procedure/cell reselection procedure operation will be described. Meanwhile, the embodiment of FIG. 6A may be applied even when the UE is configured to perform a cell selection operation or a cell reselection operation using at least one of an intended slice, a default slice, and a preferred slice.

6A is a diagram illustrating an operation of a terminal for determining an option of a cell selection procedure or a cell reselection procedure according to an embodiment of the present disclosure.

Referring to FIG. 6A , the terminal may obtain a system information block message (or a system information block (SIB)) in step 601 . In step 602, the UE may determine whether slice-based cell selection information and/or slice-based cell reselection information is provided (or included) in the obtained system information block message. According to the determination in step 602, if it is determined that slice-based cell selection information and/or slice-based cell reselection information is provided, the UE may perform a slice-based cell selection or slice-based cell reselection procedure in step 603. In step 603, the UE may perform the same procedure as in the embodiment of FIGS. 6B to 11, which will be described later. (intended) slice, a slice selected by the UE during cell selection/reselection (the selected slice may correspond to the UE's default slice or preferred slice) may be reported. Alternatively, if it is determined in step 602 that slice-based cell selection information and/or slice-based cell reselection information is not provided according to the determination in step 602, the UE may perform a general conventional cell selection or cell reselection procedure in step 604. Meanwhile, in step 604, the terminal performing the conventional cell selection or cell reselection procedure may report the configured slice information set in the terminal to the base station/network.

In a communication system to which the present disclosure can be applied, a terminal determines a frequency priority when performing cell selection or cell reselection, and determines whether a cell satisfies a cell selection condition for a first selected frequency or a cell for a preferentially selected frequency An operation of determining whether the cell reselection condition is satisfied may be performed. When the UE selects a cell or reselects a cell, slice information desired by the UE may be applied for the purpose of determining the frequency priority. If the terminal knows the slice and frequency mapping information, the terminal may first select a desired frequency and perform an operation of selecting a cell for the corresponding frequency or an operation of reselecting a cell. When selecting a cell or reselecting a cell for a corresponding frequency, the terminal may determine a condition of a suitable cell, in which case the condition checked by the terminal is checking whether the cell supports a public land mobile network (PLMN) of the terminal; It may include at least one or a combination of checking whether the cell belongs to a forbidden tracking area (TA), checking whether cell barring, and checking a signal strength condition. For example, if the corresponding cell supports the terminal's PLMN, is not a forbidden TA, does not become cell barring, and determines that the signal strength is above a certain threshold, the terminal may determine that the corresponding cell is a suitable cell. The UE may select a cell having the greatest signal strength among suitable cells.

Meanwhile, the terminal according to an embodiment of the present disclosure may use slice information as a condition for selecting or reselecting a cell within a frequency selected according to priority determination. In this case, it is assumed that the frequency selection is based on a slice desired by the UE or based on other conditions. An operation in which the UE performs cell selection or cell reselection using cell selection-related slice information and cell reselection-related slice information within the selected frequency will be described with reference to FIGS. 6B to 11 .

6B is a diagram illustrating a slice-based cell selection operation of a UE according to an embodiment of the present disclosure.

Referring to FIG. 6B , the UE may obtain at least one or a combination of slice information related to cell selection and slice information related to cell reselection from the network in step 651 . Cell selection-related slice information and cell reselection-related slice information may be obtained through a system information block (SIB) message transmitted by a network or may be obtained through an RRCRelease message. The configuration of cell selection-related slice information and cell reselection-related slice information obtained through a system information block (SIB) message will be described in detail with reference to Tables 2 to 15. The processing of cell reselection-related slice information obtained through the RRCRelease message will be described in detail with reference to Table 17. In step 652, the UE may determine whether the cell selection procedure is being performed or the cell reselection procedure is being performed. If it is determined that the cell selection procedure is performed, the UE may utilize the cell selection related slice information obtained in step 651 . If it is determined that the cell reselection procedure is performed, the UE may utilize the cell reselection related slice information obtained in step 651 . The terminal performing the cell selection procedure may determine a condition of a suitable cell and acquire a suitable cell in step 653 . In step 654 , the UE may determine a condition for selecting a cell from among suitable cells and perform an operation of selecting a cell. The terminal performing the cell reselection procedure may determine a condition of a suitable cell for cell reselection in step 655 and perform an operation of acquiring a suitable cell. In step 656 , the UE may determine a condition for selecting a cell from among suitable cells for cell reselection and perform an operation of selecting a cell.

Hereinafter, an example of cell selection related slice information and cell reselection related slice information obtained by the UE in FIG. 6B and a condition of a cell to obtain and select a suitable cell by determining a suitable cell selection condition when the UE performs a cell selection operation An operation example of selecting a cell by determining do. In the embodiment of FIGS. 6B to 11 , the terminal supports PLMN as a condition for determining a suitable cell, whether the terminal belongs to forbidden TA, whether cell barring, whether the signal strength is satisfied, and whether the terminal supports the desired (intended) slice. At least one or a combination may be applied. An example in which the terminal utilizes the suitable cell determination condition will be described in each embodiment.

In the embodiment of the present disclosure, it is assumed that, when the terminal performs a cell selection operation, slice information related to cell selection in addition to the existing cell selection information can be obtained through a system information block (SIB) message transmitted by the base station. In addition, in an embodiment of the present disclosure, when the terminal performs a cell reselection operation, in addition to information for the existing cell reselection, slice information related to cell reselection is obtained through a system information block (SIB) message transmitted by the base station. assume you can On the other hand, this assumption is for convenience of description, and the present disclosure is not limited thereto. Various configuration information of slice information related to cell selection and slice information related to cell reselection included in the SIB message will be described with reference to Tables 2 to 15.

The terminal performing the cell selection procedure may be configured to determine a suitable cell for cell selection by applying at least one or a combination of PLMN information, Forbidden TA information, cell barring information, signal strength, and slice information. The terminal performing the cell reselection procedure may be configured to determine a suitable cell for cell reselection by applying at least one or a combination of PLMN information, Forbidden TA information, cell barring information, signal strength, and slice information.

Examples of determining a suitable cell for cell selection use in the cell selection procedure by the terminal and determining a suitable cell for cell reselection use in the cell reselection procedure according to the setting are as follows, and the terminal is based on one or combinations of the following examples Thus, it is possible to determine a suitable cell. (Here, it is assumed that the conditions of PLMN, forbidden TA, and cell barring satisfy the conditions of suitable cells)

(1) In the cell selection procedure or the cell reselection procedure according to the configuration, the UE may determine that it is a suitable cell in consideration of only the signal strength condition regardless of whether the UE supports the intended (intended) slice.

(2) In the cell selection procedure or cell reselection procedure according to the configuration, the UE considers the signal strength condition only for the cell supporting the desired (intended) slice, for example, the UE supports the desired (intended) slice In the case of a cell for which the RSRP value of this cell is equal to or greater than a threshold, it may be determined as a suitable cell.

(3) In the cell selection procedure or cell reselection procedure according to the setting, the UE determines whether it supports the desired (intended) slice for the cell satisfying the signal strength condition, for example, the RSRP value of the cell When the threshold is greater than the threshold, it can be determined that the cell supports a slice intended by the UE as a suitable cell.

(4) In a cell selection procedure or a cell reselection procedure according to the configuration, when the UE supports a desired (intended) slice, the UE may determine that it is a suitable cell without considering a signal strength condition.

As described above, the cell selection setting for the UE to select a camp on cell from among suitable cells for cell selection may be configured by at least one or a combination of signal strength and slice information. As described above, the setting for the UE to select a reselection cell from among suitable cells for cell reselection may be configured by at least one or a combination of PLMN information, forbidden TA information, cell barring information, signal strength, and slice information. Embodiments in which the terminal selects a cell from among suitable cells for cell selection in a cell selection procedure and a cell suitable for cell reselection in a cell reselection procedure according to the setting are as follows, and the terminal selects one of the following examples Alternatively, a cell may be selected from among suitable cells based on combinations (assuming that the PLMN condition, the forbidden TA condition, and the cell barring condition satisfy the suitable cell condition).

(1) A terminal performing a cell selection procedure or a cell reselection procedure according to the setting may select a cell having the greatest signal strength from among suitable cells regardless of slice information.

(2) A UE performing a cell selection procedure or a cell reselection procedure according to the configuration may select a cell supporting a slice desired by the UE from among suitable cells regardless of a signal strength condition.

(3) A terminal performing a cell selection procedure or a cell reselection procedure according to the setting may select a cell having the greatest signal strength from among suitable cells supporting a desired (intended) slice.

When the UE performs a cell selection procedure or a cell reselection procedure, if there is more than one slice supported by the UE and the slice desired by the UE, the UE desires (intended) slice priority, which is supported by the cell. A cell may be selected by determining whether a cell selection condition is satisfied or a cell reselection condition is satisfied in the order of a slice having a high priority to a slice having a low priority in consideration of the slice priority.

Next, an embodiment of an operation of a terminal for determining a suitable cell determination condition and a cell selection condition in the cell selection procedure will be described with reference to FIGS. 7 to 11 . 7 to 11 may be equally applied to a cell reselection procedure (herein, it is assumed that the PLMN condition, the Forbidden TA condition, and the cell barring condition satisfy the suitable cell condition).

7 is a diagram illustrating an operation in which a UE performs a cell selection procedure according to various embodiments of the present disclosure.

Referring to FIG. 7 , in step 701, the UE may acquire cell selection related slice information from the network. In step 702, the UE may determine a suitable cell determination condition and a cell selection condition to be applied in the cell selection procedure. In the embodiment of FIG. 7 , it is assumed that a suitable cell determination condition based on signal strength is set and a cell selection condition based on signal strength is set. In step 703, the UE may determine whether the cell satisfies a signal strength condition of a suitable cell. If it is determined that the cell satisfies the signal strength condition of the suitable cell, the terminal may determine the corresponding cell as the suitable cell in step 704 . If it is determined that the corresponding cell does not satisfy the signal strength condition of the suitable cell, the UE may not select the corresponding cell as the suitable cell in step 705 . In step 706, the UE may select a cell having the greatest signal strength from among cells determined to be suitable cells. As in the embodiment of FIG. 7 , the terminal may obtain and store cell selection related slice information from the network, but may be configured not to use the slice information for a condition for determining a suitable cell and a condition for selecting a cell (UE can store the information for cell selection in SIBs. The slice information in SIBs is not used for cell selection. selection by leveraging stored information: For example the priority of slice is stored but not used in the cell selection process.).

8 is a diagram illustrating an operation in which a UE performs a cell selection procedure according to various embodiments of the present disclosure.

Referring to FIG. 8, in step 801, the UE may acquire cell selection related slice information from the network. In step 802, the UE may determine a suitable cell determination condition and a cell selection condition to be applied in the cell selection procedure. In the embodiment of FIG. 8 , it is assumed that a suitable cell determination condition based on signal strength is set and a cell selection condition based on signal strength and a slice is set. In step 803, the UE may determine whether the cell satisfies a signal strength condition of a suitable cell. If it is determined that the cell satisfies the signal strength condition of the suitable cell, the terminal may determine the corresponding cell as the suitable cell in step 804 . If it is determined that the corresponding cell does not satisfy the signal strength condition of the suitable cell, the UE may not select the corresponding cell as the suitable cell in step 805 . In step 806, if there is a cell having the largest signal strength and satisfying a slice condition among cells determined as suitable cells, the UE may select a corresponding cell. In step 806, if there is a cell that has the largest signal strength and does not satisfy the slice condition among cells determined as suitable cells, the UE may select the corresponding cell. In step 806, the UE may not select the corresponding cell if there is a cell that satisfies the slice condition rather than the cell having the largest signal strength among the cells determined as suitable cells.

9 is a diagram illustrating an operation in which a terminal performs a cell selection procedure according to various embodiments of the present disclosure.

Referring to FIG. 9 , in step 901, the UE may acquire cell selection related slice information from the network. In step 902, the UE may determine a suitable cell determination condition and a cell selection condition to be applied in the cell selection procedure. In the embodiment of FIG. 9 , it is assumed that a suitable cell determination condition based on a signal strength is set and a cell selection condition based on a signal strength and a slice is set. In step 903, the UE may determine whether the cell satisfies a signal strength condition of a suitable cell. If it is determined that the cell satisfies the signal strength condition of the suitable cell, in step 904, the terminal may determine the corresponding cell as the suitable cell. If it is determined that the corresponding cell does not satisfy the signal strength condition of the suitable cell, the terminal may not select the corresponding cell as the suitable cell in step 905 . In step 906, if there is a cell having the largest signal strength and satisfying a slice condition among cells determined as suitable cells, the terminal may select the corresponding cell. In step 906, the UE may not select a cell if there is a cell that has the largest signal strength and does not satisfy the slice condition among cells determined as suitable cells. In this case, the UE that has not selected the cell may continue to perform the cell selection procedure while performing the operation of obtaining the cell selection related slice information from the network.

10 is a diagram illustrating an operation in which a UE performs a cell selection procedure according to various embodiments of the present disclosure.

Referring to FIG. 10, in step 1001, the UE may obtain cell selection related slice information from the network. In step 1002, the UE may determine a suitable cell determination condition and a cell selection condition to be applied in the cell selection procedure. In the embodiment of FIG. 10 , it is assumed that a suitable cell determination condition based on signal strength is set and a cell selection condition based on a slice is set. In step 1003, the UE may determine whether the cell satisfies a signal strength condition of a suitable cell. If it is determined that the cell satisfies the signal strength condition of the suitable cell, the terminal may determine the corresponding cell as the suitable cell in step 1004 . If it is determined that the corresponding cell does not satisfy the signal strength condition of the suitable cell, the UE may not select the corresponding cell as the suitable cell in step 1005 . In step 1006, if there is a cell satisfying the slice condition among cells determined as suitable cells, the UE may select the corresponding cell. In step 1006, the UE may not select a cell if there is no cell satisfying the slice condition among cells determined as suitable cells. In this case, the UE that has not selected the cell may continue to perform the cell selection procedure while performing the operation of obtaining the cell selection related slice information from the network.

11 is a diagram illustrating an operation in which a terminal performs a cell selection procedure according to various embodiments of the present disclosure.

Referring to FIG. 11 , in step 1101, the UE may acquire cell selection related slice information from the network. In step 1102, the UE may determine a suitable cell determination condition and a cell selection condition to be applied in the cell selection procedure. In the embodiment of FIG. 11 , it is assumed that a slice-based suitable cell determination condition is set and a signal strength-based cell selection condition is set. In step 1103, the UE may determine whether the cell satisfies a slice condition of a suitable cell. If it is determined that the cell satisfies the slice condition of the suitable cell, in step 1104, the UE may determine the corresponding cell as the suitable cell. If it is determined that the corresponding cell does not satisfy the slice condition of the suitable cell, in step 1105 , the UE may not select the corresponding cell as the suitable cell. In step 1106, the UE may select a cell having the greatest signal strength from among cells determined as suitable cells.

When the UE performs a cell selection procedure according to an embodiment of the present disclosure, the UE desires (intended) based on the cell selection related slice information (eg, obtained from the configuration information of Tables 2 to 15) Information or a combination of at least one of a slice priority and a cell or frequency priority may be determined in a cell or frequency supporting a slice, or a cell or frequency. When the terminal wants to receive a general service without needing to receive support for a specific slice, the terminal can measure the signal strength based on the cell or frequency priority as before (here, the PLMN condition, the Forbidden TA condition, and the cell barring condition are It is assumed that the condition of suitable cell is satisfied). The terminal may determine a suitable cell according to the signal strength measurement result and may select a cell having the greatest signal strength from among suitable cells. When the UE intends to receive service of a specific slice (intentional slice of the UE), the UE may consider cell or frequency priority information and slice priority information in cell or frequency. The UE may determine whether a desired slice is supported or the priority of a desired slice based on the slice priority information in a cell or frequency. In this case, the UE may determine a cell or frequency supporting the desired slice, and measure the signal strength of the cell or frequency based on the priority of the cell or frequency. The UE may determine a suitable cell according to the signal strength measurement result (in this case, it is assumed that the PLMN condition, the Forbidden TA condition, and the cell barring condition satisfy the suitable cell condition), and selects a cell having the largest signal strength among suitable cells. You can choose. Alternatively, the UE may determine a cell or frequency that preferentially supports a desired slice, and measure the signal strength of the cell or frequency based on the priority of the cell or frequency. The UE may determine a suitable cell according to the signal strength measurement result (in this case, it is assumed that the PLMN condition, the Forbidden TA condition, and the cell barring condition satisfy the suitable cell condition), and selects a cell having the largest signal strength among suitable cells. You can choose.

When the UE performs a cell reselection procedure according to an embodiment of the present disclosure, the UE is based on cell reselection-related slice information (eg, obtained from the configuration information of Tables 2 to 15 and the information of Table 17) It is possible to determine information or a combination of at least one of a slice priority, a cell or a frequency priority in a cell or frequency, or a cell or frequency supporting a desired (intended) slice. When the terminal wants to be provided with a general service without needing to receive support for a specific slice, the terminal can measure the signal strength based on cell or frequency priority as in the past. The UE may determine a suitable cell according to the signal strength measurement result (in this case, it is assumed that the PLMN condition, the Forbidden TA condition, and the cell barring condition satisfy the suitable cell condition), and selects a cell having the largest signal strength among suitable cells. You can choose. When the UE desires to receive support for a specific slice (corresponding to an intended slice), the UE may consider cell or frequency priority information and slice priority information in cell or frequency. The UE may determine whether an intended slice is supported or the priority of a desired slice based on slice priority information in a cell or frequency. In this case, the UE may determine a cell or frequency supporting a desired (intended) slice and measure the signal strength of the cell or frequency based on the priority of the cell or frequency. The UE may determine a suitable cell according to the signal strength measurement result (in this case, it is assumed that the PLMN condition, the Forbidden TA condition, and the cell barring condition satisfy the suitable cell condition), and selects a cell having the greatest signal strength from among suitable cells. can Alternatively, the UE may determine a cell or frequency that preferentially supports a desired (intended) slice, and measure the signal strength of the cell or frequency based on the priority of the corresponding cell or frequency. The UE may determine a suitable cell according to the signal strength measurement result (in this case, it is assumed that the PLMN condition, the Forbidden TA condition, and the cell barring condition satisfy the conditions of the suitable cell), and selects a cell having the greatest signal strength among suitable cells. You can choose.

On the other hand, according to various embodiments of the present disclosure, a terminal operation when it is determined that a cell selected by the terminal cannot select a cell supporting a desired (intended) slice according to a cell selection condition is as follows.

A default slice may be set as one of the configured slices of the terminal. A slice required when the UE selects a cell in a cell selection procedure or a cell reselection procedure may include a default slice. When a default slice is configured, the UE may receive support for a PDU session corresponding to the default slice. In general, an enhanced mobile broadband (eMBB) service slice may be configured as a default slice, and of course, a slice corresponding to another service may also be configured as a default slice.

When the UE selects a cell and determines to use a default slice, the following example may be considered.

● When it is determined that the selected cell does not support the slice required by the UE according to the cell selection/reselection condition (eg, cell selection with the highest signal strength), the UE may be provided with a default slice through the selected cell.

● When it is determined that the selected suitable cell does not support the slice required by the UE according to the suitable cell selection/reselection condition (eg, selection of a cell having an RSRP value equal to or greater than the threshold), the UE selects a cell having the greatest signal strength among suitable cells It may be selected and provided with a default slice through the selected cell.

As an embodiment of the present disclosure, when the UE selects a cell to provide a default slice and performs an access procedure, a random access channel (RACH) parameter configured for the default slice may be used. As another embodiment, when the UE selects a cell to provide a default slice and performs an access procedure, a slice specific RACH parameter may be used.

(1) If a default slice is set for the terminal and it is determined that the selected cell supports the default slice, the terminal may transmit and receive packets corresponding to the default slice in the selected cell. Here, the selected cell corresponds to a cell having the greatest signal strength. The UE transmits at least one or a combination of slice information desired by the UE and slice information (default slice information) selected when the UE selects a cell while performing a connection procedure in the selected cell, for example, to the base station / network through the RRCSetupComplete message. can report

(2) If a default slice is configured for the terminal and it is determined that the selected cell supports the default slice as a preferred slice, the terminal may perform packet transmission/reception corresponding to the default slice in the selected cell. The UE transmits at least one or a combination of slice information desired by the UE and slice information (default slice information) selected when the UE selects a cell while performing a connection procedure in the selected cell, for example, to the base station / network through the RRCSetupComplete message. can report

(3) If a default slice is set for the terminal and the default slice supported by the selected cell does not correspond to the default slice of the terminal, the terminal may not select the corresponding cell.

(4) If a default slice is set for the terminal and the default slice supported by the selected cell does not correspond to the default slice of the terminal, the terminal may determine that it can perform a general access procedure through the corresponding cell. The terminal may report desired slice information to the base station/network through, for example, an RRCSetupComplete message while performing a connection procedure in the selected cell.

According to various embodiments of the present disclosure, the network may configure preferred slice information in a cell or frequency and provide it to the UE through a system information block (SIB) message. A slice desired by the UE may be included in a preferred slice, and a slice intended by the UE may not be included in a preferred slice. A slice desired by the UE is not included in the preferred slice, but a default slice configured for the UE may be included in the preferred slice. The UE may select a cell based on signal strength and slice information according to the cell selection condition or cell reselection condition set above, including a preferred slice. If the UE determines that the desired (intended) slice is not included in the preferred slice, the UE may not select the corresponding cell. If the UE determines that the desired (intended) slice is not included in the preferred slice, the UE may determine that a general access procedure can be performed through the corresponding cell. The terminal may report desired slice information to the base station/network through, for example, an RRCSetupComplete message while performing a connection procedure in the selected cell. If the UE determines that the desired (intended) slice is not included in the preferred slice, but the default slice configured for the UE is included in the preferred slice, the UE determines that the default slice can be provided through the cell and for the default slice service You can select that cell. While performing the connection procedure in the cell selected for the default slice, the UE transmits at least one or a combination of slice information desired by the UE and slice information (default slice information) selected when the UE selects a cell, for example, through an RRCSetupComplete message. It can report to the base station/network.

According to an embodiment of the present disclosure, cell selection information including slice information obtained by the terminal from a base station and cell reselection information including slice information may be configured as follows. The following slice information of 1, 2, and 3 may include at least one or a combination of default slice configuration information and preferred slice configuration information.

1. At least one or a combination of cell selection information of a serving cell, cell reselection information of a serving cell, cell selection information of a serving cell inter-frequency, and cell reselection information of a serving cell inter-frequency. The information may include, for example, the following information.

- Slice related priority info for serving cell, serving cell frequency(ies): List of frequency priority, List of NSSAI (slice identifier) of serving cell freq (incl. default slice)

- Signal strength condition, PLMN information, TA information, cell barring information

2. Cell selection information of an adjacent cell, adjacent cell reselection information, cell selection information of an adjacent cell intra-frequency, cell reselection information of an adjacent cell intra-frequency, cell selection information of an adjacent cell inter-frequency, adjacent cell inter- At least one or a combination of cell reselection information of frequency. The information may include, for example, the following information.

- Slice related priority info for neighboring cell, neighboring cell frequency(frequencies): List of frequency priority, List of NSSAI (slice identifier) of neighboring cell freq (incl. default slice)

The information may be configured as follows, for example.

sliceOfIntraFreqNeighboringCell SEQUENCE (SIZE (1..maxSlice)) OF SliceOfInfraFreqNeighboringCell

sliceOfInterFreqNeighboringCell SEQUENCE (SIZE (1..maxSlice)) OF SliceOfInterFreqNeighboringCell

- Signal strength condition, PLMN information, TA information, cell barring information

3. At least one or a combination of PLMN specific slice and PLMN common slice

The configuration of a system information block message (SIB) including the slice information, cell selection information, slice information, and cell reselection information is as follows. SIB1, SIB2, SIB3, SIB4, and SIB5 defined in the radio access network New Radio system according to the 5G mobile communication standard are cell selection information, cell re It may include optional information. SIB1, SIB2, SIB3, SIB4, and SIB5 may be configured to include slice information that can be supported by each of the serving cell, the same frequency, the adjacent frequency, the adjacent cell, and the heterogeneous RAT according to an embodiment of the present disclosure as shown in Table 2 below. . As another embodiment, the information in Table 2 is configured as a separate SIB from SIB1, SIB2, SIB3, SIB4, and SIB5, and the UE may acquire it.

SIB1: slice related info in serving cell (cell selection)
List of NSSAI of serving cell frequency, cell selection info
SIB2: slice related info in serving cell (cell reselection)
List of NSSAI of serving cell frequency + cell reselection info for slice/frequency
List of NSSAI of serving cell frequency, common cell reselection info for any slice info
SIB3: slice related info in neighboring cells (cell reselection)
List of neighboring cells, list of NSSAI of neighboring cells + cell reselection info for slice/neighboring cell
List of neighboring cells, list of NSSAI of neighboring cells, common cell reselection info for any slice info
SIB4: slice related info in neighboring cells (cell reselection)
List of neighboring cells, list of inter frequency, list of NSSAI + cell reselection info for slice/inter frequency/neighboring cell
List of neighboring cells, list of inter frequency, list of NSSAI, common cell reselection info for any slice info
SIB5: slice related info in inter-RAT (cell reselection)

According to various embodiments of the present disclosure, the configuration of the cell selection slice information of the serving cell may include examples of Tables 3 to 5.

SIB1 ::= SEQUENCE {
...
SlicePriorityListNR SEQUENCE {
slice-PriorityCommon Slice-PrioirtyNR OPTIONAL,
slice-PriorityPLMN Slice-PriorityNR OPTIONAL
} OPTIONAL
}
SlicePriorityNR ::= SEQUENCE {
nSSAI NSSAI, //one example of slice identifier
priority Priority OPTIONAL //access priority of the slice in the carrier
}

PLMN-IdentityInfoList ::= SEQUENCE (SIZE (1..maxPLMN)) OF PLMN-IdentityInfo
PLMN-IdentityInfo ::= SEQUENCE {
plmn-IdentityList SEQUENCE (SIZE (1..maxPLMN)) OF PLMN-Identity,
trackingAreaCode TrackingAreaCode OPTIONAL, -- Need R
ranac RAN-AreaCode OPTIONAL, -- Need R
cellIdentity CellIdentity,
cellReservedForOperatorUse ENUMERATED {reserved, notReserved},
...,
slicePriorityListNR SEQUENCE (SIZE (1..maxSlice)) OF SlicePriorityNR
}
SlicePriorityNR ::= SEQUENCE {
nSSAI NSSAI, //one example of slice identifier
priority Priority OPTIONAL //access priority of the slice in the carrier
}

CellAccessRelatedInfo ::= SEQUENCE {
plmn-IdentityList PLMN-IdentityInfoList,
cellReservedForOtherUse ENUMERATED {true} OPTIONAL, -- Need R
...,
SlicePriorityListNR SEQUENCE (SIZE (1..maxSlice)) OF SlicePriorityNR
}
SlicePriorityNR ::= SEQUENCE {
nSSAI NSSAI, //one example of slice identifier
priority Priority OPTIONAL //access priority of the slice in the carrier
}

According to various embodiments of the present disclosure, slice cell selection and cell reselection information that can be supported in inter-frequency of a serving cell may be configured as shown in the examples of Tables 6 to 9 below.

SlicePriorityListNR SEQUENCE (SIZE (1..maxSlice)) OF SlicePriorityNR
SlicePriorityNR ::= SEQUENCE {
nSSAI NSSAI, // one example of slice identifier
priority Priority OPTIONAL, //access priority of the slice in the carrier
listCarrierFreq //list of ARFCN-ValueNR or frequencyBandList
}

cellReselectionInfoCommon SEQUENCE {
nrofSS-BlocksToAverage INTEGER (2..maxNrofSS-BlocksToAverage) OPTIONAL, -- Need S
absThreshSS-BlocksConsolidation ThresholdNR OPTIONAL, -- Need S
rangeToBestCell RangeToBestCell OPTIONAL, -- Need R
q-Hyst ENUMERATED {dB0, dB1, dB2, dB3, dB4, dB5, dB6, dB8, dB10, dB12, dB14, dB16, dB18, dB20, dB22, dB24},
speedStateReselectionPars SEQUENCE {
mobilityStateParameters MobilityStateParameters,
q-HystSF SEQUENCE {
sf-Medium ENUMERATED {dB-6, dB-4, dB-2, dB0},
sf-High ENUMERATED {dB-6, dB-4, dB-2, dB0}
}
} OPTIONAL, -- Need R
...
SlicePriorityListNR SEQUENCE (SIZE (1..maxSlice)) OF SlicePriorityNR
},
cellReselectionServingFreqInfo SEQUENCE {
s-NonIntraSearchP ReselectionThreshold OPTIONAL, -- Need S
s-NonIntraSearchQ ReselectionThresholdQ OPTIONAL, -- Need S
threshServingLowP ReselectionThreshold,
threshServingLowQ ReselectionThresholdQ OPTIONAL, -- Need R
cellReselectionPriority CellReselectionPriority,
cellReselectionSubPriority CellReselectionSubPriority OPTIONAL, -- Need R
...
},
SlicePriorityNR ::= SEQUENCE {
nSSAI NSSAI, //one example of slice identifier
priority Priority OPTIONAL, //access priority of the slice in the carrier
listCarrierFreq //list of ARFCN-ValueNR or frequencyBandList
}
According to an embodiment of the present disclosure, If slicePriorityListNR is present, UE can ignore cell reselection priority/subpriority.

intraFreqCellReselectionInfo SEQUENCE {
q-RxLevMin Q-RxLevMin,
q-RxLevMinSUL Q-RxLevMin OPTIONAL, -- Need R
q-QualMin Q-QualMin OPTIONAL, -- Need S
s-IntraSearchP ReselectionThreshold,
s-IntraSearchQ ReselectionThresholdQ OPTIONAL, -- Need S
t-ReselectionNR T-Reselection,
frequencyBandList MultiFrequencyBandListNR-SIB OPTIONAL, -- Need S
frequencyBandListSUL MultiFrequencyBandListNR-SIB OPTIONAL, -- Need R
p-Max P-Max OPTIONAL, -- Need S
smtc SSB-MTC OPTIONAL, -- Need S
ss-RSSI-Measurement SS-RSSI-Measurement OPTIONAL, -- Need R
ssb-ToMeasure SSB-ToMeasure OPTIONAL, -- Need S
deriveSSB-IndexFromCell BOOLEAN,
...
slicePriorityListNR SEQUENCE (SIZE (1..maxSlice)) OF SlicePriorityNR
},
SlicePriorityNR ::= SEQUENCE {
nSSAI NSSAI, //one example of slice identifier
priority Priority OPTIONAL //access priority of the slice in the carrier
}

cellReselectionInfoCommon SEQUENCE {
nrofSS-BlocksToAverage INTEGER (2..maxNrofSS-BlocksToAverage) OPTIONAL, -- Need S
absThreshSS-BlocksConsolidation ThresholdNR OPTIONAL, -- Need S
rangeToBestCell RangeToBestCell OPTIONAL, -- Need R
q-Hyst ENUMERATED {dB0, dB1, dB2, dB3, dB4, dB5, dB6, dB8, dB10, dB12, dB14, dB16, dB18, dB20, dB22, dB24},
speedStateReselectionPars SEQUENCE {
mobilityStateParameters MobilityStateParameters,
q-HystSF SEQUENCE {
sf-Medium ENUMERATED {dB-6, dB-4, dB-2, dB0},
sf-High ENUMERATED {dB-6, dB-4, dB-2, dB0}
}
} OPTIONAL, -- Need R
},
cellReselectionServingFreqInfo SEQUENCE {
s-NonIntraSearchP ReselectionThreshold OPTIONAL, -- Need S
s-NonIntraSearchQ ReselectionThresholdQ OPTIONAL, -- Need S
threshServingLowP ReselectionThreshold,
threshServingLowQ ReselectionThresholdQ OPTIONAL, -- Need R
cellReselectionPriority CellReselectionPriority,
cellReselectionSubPriority CellReselectionSubPriority OPTIONAL, -- Need R
...
SlicePriorityListNR SEQUENCE (SIZE (1..maxSlice)) OF SlicePriorityNR
},
SlicePriorityNR ::= SEQUENCE {
nSSAI NSSAI, //one example of slice identifier
priority Priority OPTIONAL, //access priority of the slice in the carrier
listCarrierFreq //list of ARFCN-ValueNR or frequencyBandList
}
intraFreqCellReselectionInfo SEQUENCE {
...
}
According to an embodiment of the present disclosure, If slicePriorityListNR is present, UE can ignore cell reselection priority/subpriority.

According to various embodiments of the present disclosure, slice cell selection and cell reselection information that can be supported in intra-frequency of an adjacent cell may be configured as shown in the examples of Tables 10 to 11 below.

IntraFreqNeighCellInfo ::= SEQUENCE {
physCellId PhysCellId,
q-OffsetCell Q-OffsetRange,
q-RxLevMinOffsetCell INTEGER (1..8) OPTIONAL, -- Need R
q-RxLevMinOffsetCellSUL INTEGER (1..8) OPTIONAL, -- Need R
q-QualMinOffsetCell INTEGER (1..8) OPTIONAL, -- Need R
...
SlicePriorityListNR SEQUENCE (SIZE (1..maxSlice)) OF SlicePriorityNR
}
SlicePriorityNR ::= SEQUENCE {
nSSAI NSSAI, //an example of slice identifier
priority Priority OPTIONAL //access priority of the slice in the carrier
}

SIB3 ::= SEQUENCE {
intraFreqNeighCellList IntraFreqNeighCellList OPTIONAL, -- Need R
intraFreqBlackCellList IntraFreqBlackCellList OPTIONAL, -- Need R
lateNonCriticalExtension OCTET STRING OPTIONAL,
...,
SlicePriorityListNR SEQUENCE (SIZE (1..maxSlice)) OF SlicePriorityNR
}
SlicePriorityNR ::= SEQUENCE {
nSSAI NSSAI, //an example of slice identifier
priority Priority OPTIONAL //access priority of the slice in the carrier
}

According to various embodiments of the present disclosure, slice cell selection and cell reselection information that can be supported in inter-frequency of adjacent cells may be configured as in the examples of Tables 12 to 14 below.

InterFreqCarrierFreqInfo ::= SEQUENCE {
dl-CarrierFreq ARFCN-ValueNR,
frequencyBandList MultiFrequencyBandListNR-SIB OPTIONAL, -- Cond Mandatory
frequencyBandListSUL MultiFrequencyBandListNR-SIB OPTIONAL, -- Need R
nrofSS-BlocksToAverage INTEGER (2..maxNrofSS-BlocksToAverage) OPTIONAL, -- Need S
absThreshSS-BlocksConsolidation ThresholdNR OPTIONAL, -- Need S
smtc SSB-MTC OPTIONAL, -- Need S
ssbSubcarrierSpacing SubcarrierSpacing,
ssb-ToMeasure SSB-ToMeasure OPTIONAL, -- Need S
deriveSSB-IndexFromCell BOOLEAN,
ss-RSSI-Measurement SS-RSSI-Measurement OPTIONAL,
q-RxLevMin Q-RxLevMin,
q-RxLevMinSUL Q-RxLevMin OPTIONAL, -- Need R
q-QualMin Q-QualMin OPTIONAL, -- Need S
p-Max P-Max OPTIONAL, -- Need S
t-ReselectionNR T-Reselection,
t-ReselectionNR-SF SpeedStateScaleFactors OPTIONAL, -- Need S
threshX-HighP ReselectionThreshold,
threshX-LowP ReselectionThreshold,
threshX-Q SEQUENCE {
threshX-HighQ ReselectionThresholdQ,
threshX-LowQ ReselectionThresholdQ
} OPTIONAL, -- Cond RSRQ
cellReselectionPriority CellReselectionPriority OPTIONAL, -- Need R
cellReselectionSubPriority CellReselectionSubPriority OPTIONAL, -- Need R
q-OffsetFreq Q-OffsetRange DEFAULT dB0,
interFreqNeighCellList InterFreqNeighCellList OPTIONAL, -- Need R
interFreqBlackCellList InterFreqBlackCellList OPTIONAL, -- Need R
...
}
InterFreqNeighCellInfo ::= SEQUENCE {
physCellId PhysCellId,
q-OffsetCell Q-OffsetRange,
q-RxLevMinOffsetCell INTEGER (1..8) OPTIONAL, -- Need R
q-RxLevMinOffsetCellSUL INTEGER (1..8) OPTIONAL, -- Need R
q-QualMinOffsetCell INTEGER (1..8) OPTIONAL, -- Need R
...
SlicePriorityListNR SEQUENCE (SIZE (1..maxSlice)) OF SlicePriorityNR
}
SlicePriorityNR ::= SEQUENCE {
nSSAI NSSAI, //an example of slice identifier
priority Priority OPTIONAL, //access priority of the slice in the carrier
}

InterFreqCarrierFreqInfo ::= SEQUENCE {
dl-CarrierFreq ARFCN-ValueNR,
frequencyBandList MultiFrequencyBandListNR-SIB OPTIONAL, -- Cond Mandatory
frequencyBandListSUL MultiFrequencyBandListNR-SIB OPTIONAL, -- Need R
nrofSS-BlocksToAverage INTEGER (2..maxNrofSS-BlocksToAverage) OPTIONAL, -- Need S
absThreshSS-BlocksConsolidation ThresholdNR OPTIONAL, -- Need S
smtc SSB-MTC OPTIONAL, -- Need S
ssbSubcarrierSpacing SubcarrierSpacing,
ssb-ToMeasure SSB-ToMeasure OPTIONAL, -- Need S
deriveSSB-IndexFromCell BOOLEAN,
ss-RSSI-Measurement SS-RSSI-Measurement OPTIONAL,
q-RxLevMin Q-RxLevMin,
q-RxLevMinSUL Q-RxLevMin OPTIONAL, -- Need R
q-QualMin Q-QualMin OPTIONAL, -- Need S
p-Max P-Max OPTIONAL, -- Need S
t-ReselectionNR T-Reselection,
t-ReselectionNR-SF SpeedStateScaleFactors OPTIONAL, -- Need S
threshX-HighP ReselectionThreshold,
threshX-LowP ReselectionThreshold,
threshX-Q SEQUENCE {
threshX-HighQ ReselectionThresholdQ,
threshX-LowQ ReselectionThresholdQ
} OPTIONAL, -- Cond RSRQ
cellReselectionPriority CellReselectionPriority OPTIONAL, -- Need R
cellReselectionSubPriority CellReselectionSubPriority OPTIONAL, -- Need R
q-OffsetFreq Q-OffsetRange DEFAULT dB0,
interFreqNeighCellList InterFreqNeighCellList OPTIONAL, -- Need R
interFreqBlackCellList InterFreqBlackCellList OPTIONAL, -- Need R
...
SlicePriorityListNR SEQUENCE (SIZE (1..maxSlice)) OF SlicePriorityNR
}
SlicePriorityNR ::= SEQUENCE {
nSSAI NSSAI, //an example of slice identifier
priority Priority OPTIONAL //access priority of the slice in the carrier
}
According to an embodiment of the present disclosure, If slicePriorityListNR is present, UE can ignore cell reselection priority/subpriority.

In the embodiments of Tables 2 to 13, the slice configuration information obtained as cell selection information or cell reselection information is (1) a priority order of frequency per slice that can be supported for each slice or (2) a frequency It may be configured with a priority order of slice per frequency that can be supported for each. As another embodiment, (1) and (2) may be configured in combination with the applied area info. If the RAN notification area is described as an example, the UE obtains configuration information of (1) or (2) applied in RAN notification area A and configuration information of (1) or (2) applied in RAN notification area B, respectively. can do. Table 14 shows an example of the configuration information of (1), and Table 15 shows an example of the configuration information of (2). The information of (1) or (2) can be used to determine the frequency priority when the terminal performs cell reselection. That is, it can be used to determine a frequency that the UE supports the intended (intended) slice, and to preferentially select the corresponding frequency when the UE supports the desired (intended) slice.

SlicePriorityListNR ::= SEQUENCE (SIZE (1..maxSlice)) OF SlicePriorityNR
SlicePriorityNR ::= SEQUENCE {
nSSAI NSSAI, //an example of slice identifier
listCarrierFreq //list of ARFCN-ValueNR (this can be listed in priority order (implicit) or this can contain explicit priority of corresponding frequency)
}

FreqPriorityListNR ::= SEQUENCE (SIZE (1..maxFreq)) OF FreqPriorityNR
FreqPriorityNR ::= SEQUENCE {
carrierFreq ARFCN-ValueNR,
nSSAI SEQUENCE of {NSSAI}(this can be listed in priority order (implicit) or this can contain explicit priority of corresponding frequency)
}

The NSSAI used as slice identification information in the embodiments of Tables 2 to 15 is at least one or a combination of SST of a slice, SST+SD (slice differentiator) of a slice, a slice group identifier to which a slice belongs, and an index corresponding to a slice. can be marked. In the case of the index corresponding to the slice, when the terminal knows the configured slice information and the base station also knows the configured slice information of the terminal, it is information indicating the index of the corresponding slice among the configured slices.

As an embodiment of the present disclosure, the network may map access category information and slice information to set a cell barring procedure for a slice to the UE, configure cell selection related slice information, or set cell reselection related slice information . Examples of cell barring configuration, cell selection configuration, and cell reselection configuration for a slice that the UE acquires from the network are shown in Table 16. The cell selection setting and the cell reselection setting of Table 16 may be configured to be included in at least one of the system information blocks of Tables 2 to 15 above.

UAC-BarringPerCat ::= SEQUENCE {
accessCategory INTEGER (1..maxAccessCat-1),
uac-barringInfoSetIndex UAC-BarringInfoSetIndex
}
UAC-BarringInfoSetList ::= SEQUENCE (SIZE(1..maxBarringInfoSet)) OF UAC-BarringInfoSet
UAC-BarringInfoSet ::= SEQUENCE {
uac-BarringFactor ENUMERATED {p00, p05, p10, p15, p20, p25, p30, p40, p50, p60, p70, p75, p80, p85, p90, p95},
uac-BarringTime ENUMERATED {s4, s8, s16, s32, s64, s128, s256, s512},
uac-BarringForAccessIdentity BIT STRING (SIZE(7))
}

A part of the accessCategory parameter of Table 16 may be configured to be mapped to a slice (S-NSSAI). When mapped to a slice, one of the access category values 32 or 63 can be used. UAC-BarringPerCat may be used for cell barring configuration for a slice or for cell selection/cell reselection related slice configuration. When UAC-BarringPerCat is used for cell barring setting for a slice, uac-barringInfoSetIndex may be used to indicate barring information to be applied to the slice by setting the value of uac-BarringInfoSetList. When UAC-BarringPerCat is used for cell selection/reselection related slice setting purpose, uac-barringInfoSetIndex sets a value not included in uac-BarringInfoSetList to indicate that this slice is supported in the cell or frequency that is not for cell barring purpose. can be used for

The operation of the UE for determining cell selection/reselection related slice information or cell barring for a slice according to the accessCategory of UAC-BarringPerCat and configuration information of uac-barringInfoSetIndex is as follows.

(1) If it is determined that the accessCategory of UAC-BarringPerCat corresponds to the slice desired by the UE, and the uac-barringInfoSetIndex of the corresponding accessCategory is set to a value not included in the uac-BarringInfoSetList, the UE determines that this cell or frequency corresponds to the corresponding It can be determined that slices can be supported. That is, the UE may determine that this information is slice-related cell selection or cell reselection information. This information may be used by the UE in the cell selection procedure or cell reselection procedure described above. For example, the terminal uses cell selection information, cell reselection information and signal strength-based cell selection information, and signal strength-based cell reselection information obtained from UAC-BarringPerCat according to cell selection condition setting or cell reselection condition setting. , the cell selection procedure or the cell reselection procedure of FIG. 6B may be performed.

(2) If it is determined that the accessCategory of UAC-BarringPerCat corresponds to the slice desired by the UE, and the uac-barringInfoSetIndex of the corresponding accessCategory is set to one of the values included in the uac-BarringInfoSetList, the UE performs cell barring for the slice. can be determined to be applied, and the selected UAC-BarringInfoSet can be applied as a “UAC barring parameter” to cell barring of the corresponding slice.

(3) If it is determined that the accessCategory of UAC-BarringPerCat does not include the slice information desired by the UE, the UE may determine that the corresponding cell or frequency does not support the slice desired by the UE. The UE may not select the corresponding cell. Alternatively, when a corresponding cell is selected, the UE may perform an operation (transmitting an RRCSetupComplete message) of performing a connection procedure and reporting desired (intended) slice information through the corresponding cell. As another embodiment, when it is determined that the cell or frequency supports the default slice of the terminal, the terminal selects the cell and performs a connection procedure, the terminal wants (intended) slice information, the default used by the terminal when selecting the cell An operation of reporting at least one of slice information (eg, transmitting an RRCSetupComplete message) may be performed.

An operation of a network supporting cell selection and cell reselection operations of a slice-based UE according to various embodiments of the present disclosure is as follows. The network selects or reselects a cell to handover the terminal that has performed the connection procedure to another frequency or cell according to the slice policy of the network, sets CA, or sets DC, and slices according to the slice policy of the network A service may be provided to the corresponding terminal (RRCReconfiguration message). A slice provided to a UE according to handover, CA, or DC configuration may be different from slice information configured in a system information block (SIB) message. In addition, the network may redirect the terminal to another frequency or another cell according to the slice policy of the network, and provide a slice service according to the slice policy of the network to the corresponding terminal (RRCRelease). The slice provided to the UE according to the redirection configuration may be different from slice information configured in a system information block (SIB) message. When the base station / network redirects or handover the terminal to another frequency or another cell, configures CA, or sets DC, the base station / network provides the slice information desired by the terminal from the terminal, when the terminal selects a cell If at least one of the selected slice information (eg, default slice) is reported and received, the slice information desired by the terminal or the selected slice information is transmitted to the base station/network of another frequency or cell through an inter-node message. can

Table 17 below shows an example of an operation of a terminal having obtained a redirection configuration including cell reselection related slice information from a network. The UE may receive the RRCRelease message from the network and determine whether the RRCRelease message includes cell reselection-related slice information. The UE may store cell reselection related slice information. If it is determined that the RRCRelease message includes the t320 timer information, the UE may set T320 as a value of the t320 timer information and start the T320 timer. If it is determined that the T320 timer has not expired when the UE performs the cell reselection operation, the UE may perform the cell reselection operation by using the cell reselection-related slice information obtained from the RRCRelease message. If it is determined that the T320 timer has expired when the UE performs a cell reselection operation, the UE may obtain cell reselection related slice information from the system information block message, and cell reselection related slice information obtained from the system information block message can be used to perform a cell reselection operation. If the UE obtains the RRCRelease message from the network but does not include cell reselection related slice information, the UE may obtain cell reselection related slice information from the system information block message, and the cell reselection related slice information obtained from the system information block message A cell reselection operation may be performed using selection-related slice information. An example of an operation in which the UE performs a cell reselection operation by using the cell reselection related slice information from the RRCRelease message or the system block message is shown in FIG. 6B.

1> if the RRCRelease message includes the cellReselectionPriorities:
2> store the (slice specific) cell reselection priority information provided by the cellReselectionPriorities;
2> if the t320 is included:
3> start timer T320, with the timer value set according to the value of t320;
1> else:
2> apply the (slice specific) cell reselection priority information provided in the slice specific SIB; // slice specific SIB is an embodiment of Tables 2 to 15

The UE may perform a cell reselection measurement procedure based on slice-related cell selection/cell reselection configuration information obtained from the network while performing the RRC connection establishment procedure, for example, through a system information block message. When the terminal determines that a new suitable cell supporting the desired (intended) slice exists while the T300 timer is performed, the terminal sets the release code to "RRC Connection Failure" and performs a procedure of transitioning to the RRC_IDLE state can do. When the UE determines that a new suitable cell supporting a slice desired by the UE exists while the T300 timer is being performed, as another embodiment, the UE sets the release code to “other” and performs a procedure of transitioning to the RRC_IDLE state. have.

Next, a method for configuring a random access channel (RACH) resource for a specific slice or a specific slice group will be described. One slice group may consist of one or a plurality of slices. If a RACH resource mapped to a slice or a slice group is configured, the UE may perform a random access procedure using the RACH resource mapped to a desired slice or a desired slice group. Here, the RACH resource may include at least one of a PRACH preamble, a RACH occasion (RO), etc. used in the random access procedure.

According to an embodiment, the RACH resource configuration corresponding to a slice or a slice group may always include a PRACH configuration index (prach-ConfigurationIndex). SSB-SharedRO-MaskIndex may optionally be included in the RACH resource setting, and when this information is included, it is used to indicate the subset of RO indicated by the PRACH configuration index of the RACH resource setting corresponding to the slice or slice group. , the slice or slice group may use the indicated subset of RO. If the SSB-SharedRO-MaskIndex is not included in the RACH resource configuration, this indicates that the UE can use all ROs indicated by the PRACH configuration index of the RACH resource configuration corresponding to a slice or slice group. According to an embodiment, SSB-PerRACH-OccasionAndCB-PreamblesPerSSB may always be included in the RACH resource configuration corresponding to a slice or a slice group.

According to an embodiment, an embodiment of the RACH resource configuration corresponding to a slice or a slice group may not always include a PRACH configuration index (prach-ConfigurationIndex). For example, when the RO corresponding to the corresponding RACH resource configuration is shared with other RACH resource configurations, the PRACH configuration index may not be included. In this case, the RACH resource configuration may include an index of another RACH resource configuration sharing the RO. For example, if the 3rd RACH resource configuration, the 5th RACH resource configuration, and the 6th RACH resource configuration share the RO, the PRACH configuration index may be included in the 3rd RACH resource configuration, and the 5th RACH resource configuration and the 6th RACH resource configuration The resource configuration may include an index indicating the third RACH resource configuration. Alternatively, the base station may configure each RACH resource configuration by allocating the same RACH resource configuration index to the RACH resource configuration sharing the RO. For example, if the 3rd RACH resource configuration, the 5th RACH resource configuration, and the 6th RACH resource configuration share the RO, the PRACH configuration index may be included in the 3rd RACH resource configuration, and the 3rd RACH resource configuration includes the RACH resource configuration. Indexes may be included. The fifth RACH resource configuration and the sixth RACH resource configuration may include the same RACH resource configuration index included in the third RACH resource configuration. SSB-SharedRO-MaskIndex can optionally be included in the RACH resource setting, and when this information is included, it is used to indicate the subset of RO pointed to by the PRACH configuration index of the RACH resource setting corresponding to a slice or slice group. A slice or slice group may use a subset of the indicated RO. If the SSB-SharedRO-MaskIndex is not included in the RACH resource configuration, this indicates that the UE can use all ROs indicated by the PRACH configuration index of the RACH resource configuration corresponding to a slice or slice group. According to an embodiment, SSB-PerRACH-OccasionAndCB-PreamblesPerSSB may always be included in the RACH resource configuration corresponding to a slice or a slice group. Alternatively, according to an embodiment, SSB-PerRACH-OccasionAndCB-PreamblesPerSSB is not included in the RACH resource configuration corresponding to a slice or slice group, and CB-PreamblesPerSSB-PerSharedRO may be included in the RACH resource configuration in which the RO is shared. In this case, the SSB-PerRACH-OccasionAndCB-PreamblesPerSSB and the PRACH configuration index (prach-ConfigurationIndex) may be included in only one RACH resource configuration among RACH resource configurations sharing the RO.

According to an embodiment, the RACH resource configuration corresponding to a slice or a slice group may not always include a PRACH configuration index (prach-ConfigurationIndex). For example, when the RO corresponding to the corresponding RACH resource configuration is shared with other RACH resource configurations, the PRACH configuration index may not be included. The base station may continuously configure RACH resource settings sharing the RO, and the first RACH resource setting among the RACH resource settings sharing the RO may include a PRACH configuration index. SSB-SharedRO-MaskIndex can optionally be included in the RACH resource setting, and when this information is included, it is used to indicate the subset of RO pointed to by the PRACH configuration index of the RACH resource setting corresponding to a slice or slice group. A slice or slice group may use a subset of the indicated RO. If the SSB-SharedRO-MaskIndex is not included in the RACH resource configuration, this indicates that the UE can use all ROs indicated by the PRACH configuration index of the RACH resource configuration corresponding to a slice or slice group. According to an embodiment, SSB-PerRACH-OccasionAndCB-PreamblesPerSSB may always be included in the RACH resource configuration corresponding to a slice or a slice group. Alternatively, according to an embodiment, SSB-PerRACH-OccasionAndCB-PreamblesPerSSB may not be included in the RACH resource configuration corresponding to a slice or slice group, but CB-PreamblesPerSSB-PerSharedRO may be included in the RACH resource configuration in which the RO is shared. In this case, the SSB-PerRACH-OccasionAndCB-PreamblesPerSSB and the PRACH configuration index (prach-ConfigurationIndex) may be included in only one RACH resource configuration among RACH resource configurations sharing the RO.

Configuration information for mapping a slice or a slice group to be used for the above-described RACH resource configuration may be transmitted from the base station to the terminal as follows.

A first method of configuring RACH resources for a slice or a slice group is as follows. In order to indicate the RACH resource configuration corresponding to a slice or a slice group, the base station configures a slice list for a slice or a slice group (that is, corresponding to a list of one or more slice identifiers or slice group identifiers), and the base station configures the RACH resource You can configure the settings. The RACH resource configuration may include at least one or a combination of PRACH configuration index (prach-ConfigurationIndex), SSB-PerRACH-OccasionAndCB-PreamblesPerSSB, SSB-SharedRO-MaskIndex, and CB-PreamblesPerSSB-PerSharedRO. In this case, the base station implicitly sets the index of slice information according to the order of the slice or slice group set in the slice list, and the RACH resource configuration may include the index of the mapped slice information. For example, if the slice list is composed of {slice A, slice B, slice C}, slice A may correspond to index 0, slice B may correspond to index 1, and slice C may correspond to index 2, and the base station may use index 0. RACH resource setting includes index 0 for RACH resource setting, index 1 for RACH resource setting to be used by index 1, and index 2 for RACH resource setting to be used by index 2. configurable. On the other hand, the above example is for convenience of description, and the present disclosure is not limited thereto.

A second method of configuring RACH resources for a slice or a slice group is as follows. The base station may configure a RACH resource configuration list, and each RACH resource configuration may include a mapped slice identifier or a slice group identifier. The RACH resource configuration may include at least one or a combination of PRACH configuration index (prach-ConfigurationIndex), SSB-PerRACH-OccasionAndCB-PreamblesPerSSB, SSB-SharedRO-MaskIndex, and CB-PreamblesPerSSB-PerSharedRO.

A third method of configuring RACH resources for a slice or a slice group is as follows. The base station configures a slice list (ie, corresponding to a list of one or more slice identifiers or slice group identifiers) for a slice or a slice group, and the base station may configure RACH resource settings. The RACH resource configuration may include at least one or a combination of PRACH configuration index (prach-ConfigurationIndex), SSB-PerRACH-OccasionAndCB-PreamblesPerSSB, SSB-SharedRO-MaskIndex, and CB-PreamblesPerSSB-PerSharedRO. The base station may set an index of slice information for a slice or slice group configured in the slice list, and may include an index of mapped slice information in the RACH resource configuration. For example, if the slice list is composed of {slice A, slice B, slice C}, the base station sets slice A to index 0, slice B to index 1, and slice C to index 2, and sets the slice and its corresponding A slice list including an index can be constructed. The base station includes index 0 in the RACH resource configuration to be used by index 0, includes index 1 in the RACH resource configuration to be used by index 1, and includes index 2 in the RACH resource configuration to be used by index 2, corresponding to a slice/slice group RACH resource setting information can be configured. On the other hand, the above example is for convenience of description, and the present disclosure is not limited thereto.

Methods according to the embodiments described in the claims or specifications of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium are configured to be executable by one or more processors in an electronic device (device). One or more programs include instructions for causing an electronic device to execute methods according to embodiments described in a claim or specification of the present disclosure.

Such programs (software modules, software) include random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable ROM (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or any other form of It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all thereof. In addition, each configuration memory may be included in plurality.

In addition, the program accesses through a communication network composed of a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. It may be stored in an attachable storage device that can be accessed. Such a storage device may be connected to a device implementing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may be connected to the device implementing the embodiment of the present disclosure.

In the specific embodiments of the present disclosure described above, elements included in the disclosure are expressed in the singular or plural according to the specific embodiments presented. However, the singular or plural expression is appropriately selected for the context presented for convenience of description, and the present disclosure is not limited to the singular or plural component, and even if the component is expressed in plural, it is composed of a singular or singular. Even an expressed component may be composed of a plurality of components.

Meanwhile, although specific embodiments have been described in the detailed description of the present disclosure, various modifications are possible without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments and should be defined by the claims described below as well as the claims and equivalents.

Claims (1)

A method for processing a control signal in a wireless communication system of a communication system, the method comprising:
Receiving a first control signal transmitted from the base station;
processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station.

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