Method and related device for slice-based cell reselection

Abstract

A method of slice-based cell reselection performed by a UE is provided. The method includes receiving slice priority information including at least one slice and at least one priority value associated with the at least one slice; receiving frequency priority information including one or more slices, at least one frequency supporting the one or more slices, and one or more priority values associated with the one or more slices; selecting a first slice based on the slice priority information; determining whether a cell on the at least one frequency in the frequency priority information supports the first slice; reselecting a second slice when the UE determines that the cell does not support the first slice; determining at least one reselection priority for the at least one frequency in the frequency priority information based on the second slice, the slice priority information, and the frequency priority information.

Description

Technical Field

[0001] This disclosure generally relates to wireless communications, and more specifically to a method for slice-based cell reselection and related devices configured to apply the method. Background Technology

[0002] With the massive growth in the number of connected devices and the rapid increase in user / network traffic, various efforts have been made to improve different aspects of wireless communication systems, such as fifth-generation (5G) New Radio (NR) systems, by increasing data rates, latency, reliability, and mobility.

[0003] 5G NR systems are designed to provide flexibility and configurability for optimizing network services and types, and to adapt to a variety of use cases, such as enhanced mobile broadband (eMBB), massive machine-type communication (mMTC), and ultra-reliable and low-latency communication (URLLC).

[0004] However, with the continued increase in demand for radio access, further improvements to wireless communication in next-generation wireless communication systems are needed. In next-generation cellular networks, slice-based cell reselection under network control has been proposed, enabling UEs to quickly access cells that support their intended slices, thereby achieving energy efficiency. However, there are no specifications regarding how UEs perform slice-based cell reselection mechanisms (e.g., intra-frequency / inter-frequency / RAT inter-cell reselection). Therefore, when a UE initially camps on a cell that does not support its intended slice, the UE may not know how to perform cell reselection (e.g., slice-based cell reselection) in an energy-efficient and time-efficient manner. Summary of the Invention

[0005] This invention provides a cell reselection method and related equipment based on cell slices.

[0006] According to one aspect of this disclosure, a slice-based cell reselection method performed by a user equipment (UE) is provided. The method includes: receiving slice priority information from the non-access stratum (NAS) layer of the UE by the UE's access stratum (AS) layer, the slice priority information including at least one slice and at least one priority value associated with the at least one slice; receiving frequency priority information from a serving cell, the frequency priority information including one or more slices, at least one frequency supporting the one or more slices, and one or more priority values ​​associated with the one or more slices; selecting a first slice among the at least one slices based on the slice priority information; in response to selecting the first slice, determining whether a cell on the at least one frequency indicated in the frequency priority information supports the first slice, the cell being detected by the UE according to a sorting criterion associated with signal strength measurement; when the UE determines that the cell does not support the first slice, reselecting a second slice among the at least one slices; and determining at least one reselection priority for the at least one frequency indicated in the frequency priority information based on the second slice, the slice priority information, and the frequency priority information, wherein: the first reselection priority of the at least one reselection priority of the first frequency among the at least one frequency indicated in the frequency priority information is determined according to a first priority value among the one or more priority values ​​indicated in the frequency priority information, the first frequency supporting the second slice, and the first priority value associated with the second slice.

[0007] According to another aspect of this disclosure, a UE is provided for performing slice-based cell reselection. The UE includes at least one processor and at least one memory coupled to the at least one processor and storing computer-executable instructions that, when executed by the at least one processor, cause the UE to perform the disclosed method of slice-based cell reselection. Attached Figure Description

[0008] The various aspects of this disclosure are best understood from the following detailed description when read in conjunction with the accompanying drawings. The features are not drawn to scale. For clarity of discussion, the dimensions of the features may be arbitrarily increased or decreased.

[0009] Figure 1 This is a flowchart of slice-based cell reselection with slice priority according to an embodiment of the present disclosure.

[0010] Figure 2 This is a flowchart of slice-based cell reselection according to an embodiment of the present disclosure.

[0011] Figure 3This is a flowchart of a method / process for slice-based cell reselection according to embodiments of the present disclosure.

[0012] Figure 4 This is a block diagram of a node for wireless communication according to an embodiment of the present disclosure. Detailed Implementation

[0013] The following description contains specific information relating to the exemplary embodiments in this disclosure. The accompanying drawings and detailed description are merely illustrative. However, this disclosure is not limited to these exemplary embodiments. Other variations and embodiments of this disclosure will be apparent to those skilled in the art. Unless otherwise stated, the same or corresponding parts in the drawings may be indicated by the same or corresponding reference numerals. Furthermore, the drawings and illustrations in this disclosure are generally not drawn to scale and are not intended to correspond to actual relative dimensions.

[0014] For the sake of continuity and ease of understanding, similar features are indicated in the example drawings (although not in some embodiments). However, features in different embodiments may differ in other respects and should not be narrowly limited to the features shown in the drawings.

[0015] The terms "in one embodiment" and "in some embodiments" can refer to one or more of the same or different embodiments, respectively. The term "coupled" is defined as a connection, whether direct or indirect through an intermediate component, and is not necessarily limited to a physical connection. The term "comprising" when used means "including but not limited to"; it explicitly indicates an open inclusion or describes members of a combination, group, series, and equivalent.

[0016] The term "and / or" here is used only to disclose the relationships between related objects, indicating that three relationships may exist. For example, "A and / or B" means that A exists alone, A and B exist simultaneously, or B exists alone. "A and / or B and / or C" can mean that at least one of A, B, and C exists, A and B exist simultaneously, A and C exist simultaneously, B and C exist simultaneously, or A, B, and C exist simultaneously. Furthermore, the character " / " here usually indicates that the former and the latter related objects are in an "OR" relationship.

[0017] The UE can be referred to as a Physical Layer (PHY), Medium Access Control (MAC), Radio Link Control (RLC), Packet Data Convergence Protocol (PDCP), Service Data Adaptation Protocol (SDAP), Radio Resource Control (RRC), Access Stratum (AS), or Non-Access Stratum (NAS) layer / entity. The PHY / MAC / RLC / PDCP / SDAP / RRC / AS / NAS layers / entities can all be referred to as the UE.

[0018] A network (NW) can be a network node, a transmission / reception point (TRP), a cell (e.g., a special cell (SpCell), a primary cell (PCell), a primary SCell (PSCell), and / or a secondary cell (SCell)), an eNB, a gNB, and / or a base station.

[0019] Serving cell: PCell, PSCell, or SCell. The serving cell can be an active serving cell or a deactivated serving cell.

[0020] SpCell: For dual-connectivity operations, the term "special cell" refers to either the PCell of the Master Cell Group (MCG) or the PSCell of the Secondary Cell Group (SCG), depending on whether the MAC entity is associated with the MCG or the SCG. Otherwise, the term "special cell" refers to the "PCell".

[0021] The terms “initiate,” “trigger,” “apply,” “store,” and “start” are used interchangeably in some embodiments of this disclosure.

[0022] The terms “termination,” “stop,” “release,” “suspend,” “discard,” “end,” “complete,” “abort,” and “cancel” may be used interchangeably in some embodiments of this disclosure.

[0023] The terms “cycle,” “process,” “phase,” and “duration” are used interchangeably in some embodiments of this disclosure.

[0024] The terms “resource” and “occasion” are used interchangeably in some implementations of this disclosure.

[0025] The terms “in progress,” “running,” and “pending” are used interchangeably in some embodiments of this disclosure.

[0026] The terms “mechanism,” “scheme,” and “function” may be used interchangeably in some embodiments of this disclosure.

[0027] The terms “mapped to” and “associated with” are used interchangeably in some embodiments of this disclosure.

[0028] Furthermore, any two or more of the following paragraphs, (sub)items, points, actions, behaviors, terms, alternatives, examples, or claims in this disclosure may be logically, reasonably, and appropriately combined to form a particular method. Any sentence, paragraph, (sub)item, point, action, behavior, term, or claim in this disclosure may be implemented independently and individually to form a particular method. Dependencies in this disclosure, such as “based on,” “more specifically,” “preferably,” “in one embodiment,” “in one implementation,” “in an alternative,” may refer only to a possible example that does not limit the particular method.

[0029] For non-limiting interpretations, specific details, such as functional entities, technologies, protocols, standards, etc., are elaborated to provide an understanding of the disclosed technologies. In other examples, detailed disclosures of well-known methods, technologies, systems, and architectures are omitted to avoid obscuring this disclosure with unnecessary detail.

[0030] Those skilled in the art will readily recognize that any one or more network functions or algorithms described in this disclosure can be implemented by hardware, software, or a combination of software and hardware. The described functions may correspond to modules, which can be software, hardware, firmware, or any combination thereof. Software implementations may include computer-executable instructions stored on a computer-readable medium such as memory or other types of storage devices. For example, one or more microprocessors or general-purpose computers with communication processing capabilities may be programmed to have corresponding executable instructions and execute the described one or more network functions or algorithms. The microprocessor or general-purpose computer may be constructed from application-specific integrated circuits (ASICs), programmable logic arrays, and / or using one or more digital signal processors (DSPs). While the embodiments disclosed herein are directed to software installed and executed on computer hardware, alternative exemplary implementations, implemented as firmware or hardware or a combination of hardware and software, are also within the scope of this disclosure.

[0031] Computer-readable media include, but are not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, compact disc read-only memory (CD-ROM), magnetic tape, magnetic tape, disk storage, or any other equivalent medium capable of storing computer-readable instructions.

[0032] Radio communication network architectures (such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, LTE-Pro (Advanced LTE Pro) systems, or New Radio (NR)) typically include at least one base station (BS), at least one user equipment (UE), and one or more optional network elements providing connectivity within the network. The UE communicates with networks (such as Core Network (CN), Evolved Packet Core (EPC) networks, Evolved Universal Terrestrial Radio Access Network (E-UTRAN), Next-Generation Core (NGC), 5G Core (5GC), or the Internet) through a Radio Access Network (RAN) established by one or more BSs.

[0033] The UE disclosed herein may include, but is not limited to, a mobile station, a mobile terminal or device, or a user communication radio terminal. The UE may be a portable wireless device, including but not limited to mobile phones, tablets, wearable devices, sensors, or personal digital assistants (PDAs) with wireless communication capabilities. The UE may be configured to receive signals via an air interface and transmit signals to one or more cells in the RAN. A BS may include, but is not limited to, Node B (NB) in a Universal Mobile Telecommunication System (UMTS), an evolved Node B (eNB) in LTE-A, a Radio Network Controller (RNC) in UMTS, a Base Station Controller (BSC) in a GSM Enhanced Data rates for GSM Evolution EDGE RAN (GERAN) of a Global System for Mobile communications (GSM) / GSM Evolution RAN, a next-generation eNB (ng-eNB) in an Evolved Universal Terrestrial Radio Access (E-UTRA) BS connected to a 5GC, a next-generation Node B (gNB) in a 5G-RAN (or in a 5G Access Network (5G-AN)), and any other equipment capable of controlling radio communications and managing radio resources within the cell. The BS can connect to the network via a radio interface to serve one or more UEs.

[0034] Base stations can be configured to provide communication services based on at least one of the following Radio Access Technologies (RATs): Worldwide Interoperability for Microwave Access (WiMAX), GSM (commonly referred to as 2G), GERAN, General Packet Radio Service (GPRS), UMTS based on Wideband-Code Division Multiple Access (W-CDMA) (commonly referred to as 3G), High-Speed ​​Packet Access (HSPA), LTE, LTE-A, evolved LTE (eLTE), NR (commonly referred to as 5G), and / or LTE-A Pro. However, the scope of this disclosure is not limited to these protocols.

[0035] A BS is operable to provide radio coverage to a specific geographic area using multiple cells forming a RAN. The BS supports cell operation. Each cell is operable to provide service to at least one UE within its radio coverage area. More specifically, each cell (typically referred to as the serving cell) can provide service to one or more UEs within its radio coverage area (e.g., each cell allocates downlink (DL) resources and optional uplink (UL) resources to at least one UE within its radio coverage area for DL ​​packet transmission and optional UL packet transmission). The BS can communicate with one or more UEs in a radio communication system through multiple cells.

[0036] A cell can be allocated sidelink (SL) resources to support Proximity Service (ProSe), LTE SL service, and LTE / NR Vehicle-to-Everything (V2X) service. Each cell can have coverage areas overlapping with other cells. In Multi-RAT Dual Connectivity (MR-DC) scenarios, the primary cell of a Master Cell Group (MCG) or Secondary Cell Group (SCG) can be referred to as a Special Cell (SpCell). A Primary Cell (PCell) can refer to the SpCell of an MCG. A Primary SCG Cell (PSCell) can refer to the SpCell of an SCG. An MCG can refer to a group of serving cells associated with a Master Node (MN), including SpCells and one or more optional Secondary Cells (SCells). SCG can refer to a set of serving cells associated with a secondary node (SN), including SpCell and one or more optional SCells.

[0037] As previously discussed, the frame structure for NR supports flexible configuration to accommodate various next-generation (e.g., 5G) communication requirements, such as eMBB, mMTC, and URLLC, while meeting high reliability, high data rate, and low latency requirements. Orthogonal Frequency-Division Multiplexing (OFDM) technology, as described in the 3rd Generation Partnership Project (3GPP), can be used as the baseline for NR waveforms. A scalable set of OFDM parameters, such as adaptive subcarrier spacing, channel bandwidth, and cyclic prefix (CP), can also be used. Additionally, two coding schemes considered for NR are: (1) Low-Density Parity-Check (LDPC) codes and (2) Polar codes. Coding scheme adaptation can be configured based on channel conditions and / or service applications.

[0038] Furthermore, the transmission time interval (TTI) of a single NR frame should include at least DL transmission data, protection period, and UL transmission data. The portions of the DL transmission data, protection period, and UL transmission data should also be configurable, for example, based on NR-based network dynamics. SL resources can also be provided via NR frames to support ProSe or V2X services.

[0039] Slice-based cell reselection.

[0040] Slice-based cell reselection includes slice-based intra-frequency cell reselection, slice-based inter-frequency cell reselection, and slice-based inter-RAT cell reselection.

[0041] During slice-based intra-frequency cell reselection, the UE can reselect a cell on an intra-frequency basis by considering at least one of the UE's expected slice, slice priority, slice information of the serving cell, and slice information of neighboring cells. When the UE performs slice-based intra-frequency cell reselection, intra-frequency can be the same frequency on which the UE is operating (e.g., the frequency on which the UE currently camps or the serving cell). Neighboring cells in slice-based intra-frequency cell reselection can refer to those neighboring cells on the same frequency as the UE's current operation (e.g., the frequency on which the UE currently camps or the serving cell) when the UE performs slice-based intra-frequency cell reselection.

[0042] During slice-based inter-frequency cell reselection, the UE can reselect a cell on an inter-frequency basis by considering at least one of the UE's expected slice, slice priority, frequency priority, serving cell slice information, and neighboring cell slice information. When the UE performs slice-based inter-frequency cell reselection, the inter-frequency can be a frequency different from the frequency on which the UE is currently operating (e.g., the frequency on which the UE currently camps or the serving cell). Neighboring cells in slice-based inter-frequency cell reselection can refer to those neighboring cells on frequencies different from the frequency on which the UE is currently operating (e.g., the frequency on which the UE currently camps or the serving cell) when the UE performs slice-based inter-frequency cell reselection, or to those neighboring cells on frequencies different from the frequency on which the UE is currently operating when the UE performs slice-based inter-frequency cell reselection.

[0043] During slice-based inter-RAT cell reselection, the UE can reselect a cell on an inter-RAT basis by considering at least one of the UE's expected slice, slice priority, frequency priority, redirection information, slice information of the serving cell (on the source RAT), slice information of neighboring cells (on the source RAT), slice information of the target RAT, and slice information of neighboring cells on the target RAT. When the UE performs slice-based inter-RAT cell reselection, the RAT can be a different RAT than the RAT on which the UE is currently operating (e.g., the RAT or serving cell on which the UE is currently camped). Neighboring cells in slice-based inter-RAT cell reselection can refer to those neighboring cells on the same frequency as the UE's current operating frequency when the UE performs slice-based inter-RAT cell reselection, or to those neighboring cells on the same RAT but at a different frequency than the UE's current operating frequency, or to those neighboring cells on a different RAT than the UE's current operating RAT when the UE performs slice-based inter-RAT cell reselection.

[0044] Expected slice of UE.

[0045] The UE can be (pre-)configured by the NW with its intended slice. For example, the NW (e.g., Access and Mobility Management Function (AMF), Serving Cell) can send Single-Network Slice Selection Assistance Information (S-NSSAI) to the UE as its intended slice. The NW (e.g., AMF) can send NAS signaling including the S-NSSAI to the UE via the BS, and the UE can receive an RRC message including the NAS signaling from the BS. The UE's NAS layer can therefore receive the NAS signaling encapsulated in the RRC message from the UE's RRC layer. The S-NSSAI can be (but is not limited to) an allowed S-NSSAI that the NW allows the UE to apply and connect to the NW, or a configured S-NSSAI that the NW configures the UE to apply and connect to the NW. The difference between allowed S-NSSAI and configured S-NSSAI can be determined by the NW based on the S-NSSAI requested by the UE, while the configured S-NSSAI can be determined by the NW without relying on the S-NSSAI requested by the UE. Therefore, allowed S-NSSAI may be the same as or a subset of the S-NSSAI requested by the UE. Configured S-NSSAI may be the same as or different from the S-NSSAI requested by the UE.

[0046] It should be noted that the UE can send the S-NSSAI requested by the UE to the NW via the serving cell in order to request the NW to support the S-NSSAI requested by the UE.

[0047] It should be noted that the UE can send the UE-requested S-NSSAI to the serving cell in an RRC message (e.g., RRC (connection) establishment complete message) to help the serving cell select an AMF that supports the UE-requested S-NSSAI.

[0048] In some embodiments, the UE can directly request its desired slice from the NW. The S-NSSAI requested by the UE to the NW can be exactly the same as the UE's desired slice, the S-NSSAI requested by the UE to the NW can be part of the UE's desired slice, or the S-NSSAI requested by the UE to the NW can include the UE's desired slice. For example, the UE can send an RRC message (e.g., Msg5, RRC (connection) establishment complete message, RRC (connection) recovery complete message) including the (requested) S-NSSAI to the NW (e.g., AMF, serving cell) via the BS. The BS can perform AMF selection based on the requested S-NSSAI in the received RRC message. The selected AMF can support the S-NSSAI requested by the UE. As another example, the UE can send NAS signaling (e.g., registration request message) including the (requested) S-NSSAI to the NW (e.g., AMF, serving cell) via the BS. Note that the UE's expected slice can be updated via RRC messages or NAS signaling based on a response from the BS or NW. This response may include (but is not limited to) configured S-NSSAI and allowed S-NSSAI.

[0049] During initial registration (via BS to NW), in idle mode (or inactive mode) mobility, when the UE receives a paging (message), or when a Mobile Originated (MO) service occurs / arrives, the UE can provide the NW with its expected slice or have the NW configure the UE's expected slice. Idle mode (or inactive mode) mobility can refer to cell selection, cell reselection, RAN notification area update (RNAU) (e.g., the UE can send RRC messages including the UE's expected slice to the BS during (periodic or event-triggered) RNAU (e.g., RRC recovery request message, RRC recovery complete message), and the UE can receive from the BS RRC messages including updated UE expected slices (e.g., allowed S-NSSAI, configured S-NSSAI) (e.g., RRC recovery message, RRC release message with / without suspend configuration)), Tracking Area Update (TAU), etc. The BS can determine the updated RNA configuration based on the UE's expected slice and send an RRC message (e.g., RRC recovery message, RRC release message with / without a suspended configuration) including the updated RNA configuration to the UE. In response to an RRC message sent by the UE (e.g., RRC recovery request message, RRC recovery complete message), the UE can receive an RRC message (e.g., RRC recovery message, RRC release message with / without a suspended configuration) including the updated RNA configuration and apply the updated RNA configuration. It is possible that, under different conditions, the UE's expected slice may refer to different types / groups of S-NSSAI.

[0050] In the case of initial registration, the expected slice of the UE may refer to the (requested) S-NSSAI sent by the UE to the NW / BS.

[0051] In the case of idle mode mobility, the expected slice of the UE may refer to (but is not limited to) the allowed S-NSSAI and / or the configured S-NSSAI.

[0052] In the case of paging reception, the expected slice of the UE may refer to (but is not limited to) the allowed S-NSSAI, the configured S-NSSAI, the S-NSSAI associated with Mobile Terminated (MT) services, or the S-NSSAI associated with the paging downlink control information (DCI) or the paging reason in the paging message.

[0053] In the event of an MO service occurrence / arrival, the expected slice for the UE may refer to (but is not limited to) the S-NSSAI associated with the MO service.

[0054] When the UE is in the RRC_INACTIVE state, the expected slice of the UE may refer to (but is not limited to) the S-NSSAI associated with the UE's active PDU session when the UE is in the RRC_INACTIVE state, or the S-NSSAI associated with the PDU session used for small data transmission.

[0055] Slice priority information.

[0056] Slice priority information can be provided to the UE so that the UE can perform slice-based cell reselection. Slice priority information can include slices (e.g., S-NSSAI) and their corresponding priority values. In other words, slice priority information includes the priority values ​​associated with the slices. In some embodiments, the priority value can be a positive integer or a positive number.

[0057] In some embodiments, a higher priority value can represent a higher priority. A lower priority value can represent a lower priority.

[0058] In some embodiments, a lower priority value can represent a higher priority. A higher priority value can represent a lower priority.

[0059] In some embodiments, slice priority information may include slices arranged in slice order (e.g., from slices with the highest priority to slices with the lowest priority, or from slices with lower priority to slices with the highest priority). Slice priority information may be a list (or sequence) structure. Slice priority information may include a list of slices arranged in ascending or descending order of priority.

[0060] Slice priority information for slice-based cell reselection can be provided to the UE in the following ways. After the UE (or its AS layer) is provided with the slice priority information, the UE (or its AS layer) can then perform slice-based cell reselection based on the slice priority information.

[0061] In some embodiments, the NAS layer of the UE can provide slice priority information to the AS layer (especially the RRC layer) of the UE.

[0062] In some embodiments, the UE may be pre-configured with slice priority information.

[0063] In some embodiments, the UE may receive system information (e.g., System Information Block 1 (SIB1), other SIs, slice-specific SIBs) or dedicated signaling (e.g., RRC messages, NAS signaling) from the serving cell, including slice priority information.

[0064] System information may include cell-specific information about slice priority, which may be applied by a UE residing on a cell that broadcasts system information or by a cell that broadcasts system information.

[0065] Dedicated signaling may include UE-specific information about slice priorities that can be applied by a UE receiving dedicated signaling from a cell. The UE-specific information about slice priorities received via dedicated signaling may override the cell-specific information about slice priorities received via system information. In other words, when slice priority information is received via dedicated signaling (e.g., an RRC message), the UE may ignore the slice priority information received via system information (e.g., SIB). In some embodiments, the UE may jointly consider the UE-specific slice priority information received via dedicated signaling and the cell-specific slice priority information received via system information.

[0066] In some embodiments, the UE can receive NAS signaling, including slice priority information, from the NW via the serving cell. The serving cell can encapsulate the NAS signaling in dedicated signaling (e.g., an RRC message) and send the dedicated signaling, including the NAS signaling, to the UE. The UE's AS layer can receive the dedicated signaling from the serving cell, obtain the NAS signaling from the dedicated signaling, and forward the NAS signaling to the UE's NAS layer.

[0067] In some embodiments, if the UE does not receive (or is not configured) slice priority information related to the UE's expected slice, the UE may apply the default slice priority of the UE's expected slice.

[0068] The default slice priority of the expected slice for the UE can be (pre-)configured to the UE.

[0069] The UE can be configured with a default slice priority after receiving dedicated signaling (e.g., RRC message, NAS signaling) or system information (e.g., SIB1, other SIs, slice-specific SIBs). In some embodiments, the UE may receive dedicated signaling or system information, including the default slice priority of the UE's expected slice and the UE's corresponding expected slice.

[0070] In some embodiments, the UE may receive individual dedicated signaling and system information, wherein one of the individual dedicated signaling and system information includes the default slice priority of the UE's expected slice and the other of the individual dedicated signaling and system information includes the UE's corresponding expected slice.

[0071] In some embodiments, the UE may receive individual dedicated signaling sets, wherein one of the individual dedicated signaling sets includes the default slice priority of the UE's expected slice, and the other of the individual dedicated signaling sets includes the corresponding UE's expected slice.

[0072] In some embodiments, the UE may receive individual system information sets, wherein one of the individual system information sets includes the default slice priority of the UE's expected slice, and the other of the individual system information sets includes the UE's corresponding expected slice.

[0073] The default slice priority of the UE's expected slice can be pre-configured by the UE's NW or NAS layer.

[0074] The NAS layer of the UE can forward the default slice priority of the expected slice of the UE to the AS layer of the UE.

[0075] In some embodiments, if the UE does not receive slice priority information related to the UE's expected slice, the UE may determine the slice priority of each expected slice based on, but not limited to, the associated S-NSSAI value, predefined rules, pre-configured and / or operator policies.

[0076] Information on frequency priority.

[0077] When a UE performs slice-based cell reselection, frequency priority information can be provided to the UE. This frequency priority information may include (but is not limited to) slices (e.g., S-NSSAI), frequencies supporting the slice, and their corresponding priority values. In other words, frequency priority information may include priority values ​​associated with slices and / or priority values ​​associated with frequencies.

[0078] In some embodiments, frequency priority information may include a list of per-frequency entities (e.g., a list of per-frequency entities). Each frequency entity may include a frequency (e.g., an Absolute Radio-Frequency Channel Number (ARFCN) value), the slices supported by the frequency, a priority value associated with the slice, and / or a priority value associated with the frequency. In this example, the serving cell may determine that the frequencies in the entity list support the expected slices for all UEs and / or all supported slices in the NW. A UE receiving the entity list may determine that the frequencies in the entity list support the expected slices for all UEs. In other words, frequency priority information may include a list of per-frequency entities. Each entity may correspond to a frequency and may include the slices supported by the frequency and the priority value associated with that slice.

[0079] It should be noted that the priority value can be a positive integer or a positive value.

[0080] In some embodiments, a higher priority value can represent a higher priority. A lower priority value can represent a lower priority.

[0081] In some embodiments, a lower priority value can represent a higher priority. A higher priority value can represent a lower priority.

[0082] The priority value for each supported frequency can be reused or be the same as the traditional cell reselection priority and / or cell reselection sub-priority value for each supported frequency.

[0083] In some embodiments, frequency priority information may include a list of frequencies supported by the serving cell, neighboring cells, and / or the NW. The frequencies may be indicated by an ARFCN value. The order of the frequencies may indicate frequency priority. In this example, the serving cell may determine that the frequencies in the list support all expected slices for the UE and / or all supported slices in the NW. A UE receiving such a list may determine that the frequencies in the list support all expected slices for the UE.

[0084] The frequency order can be presented from highest to lowest priority (e.g., frequencies are listed in descending order of priority).

[0085] The frequency order can be presented from lowest to highest priority (e.g., frequencies are listed in ascending order of priority).

[0086] In some embodiments, frequency priority information may include a list of supported slices, each list indicating the frequency that supports the supported slice and the corresponding priority value for each frequency. In some embodiments, for slice S1, two frequencies f1 and f2 support slice S1. Frequency f1 has a priority value of 3, and frequency f2 has a priority value of 2. Meanwhile, for another slice S2, frequency f1 supports slice S2. Frequency f1 has a priority value of 1.

[0087] It should be noted that the priority value can be a positive integer or a positive value.

[0088] In some embodiments, a higher priority value can represent a higher priority. A lower priority value can represent a lower priority.

[0089] In some embodiments, a lower priority value can represent a higher priority. A higher priority value can represent a lower priority.

[0090] In some embodiments, the number of entities in the entity list of the frequency priority information may be the number of slices supported by the serving cell. Each entity is associated with a supported slice and includes the frequency of the supported slice and its corresponding priority value.

[0091] In some embodiments, frequency priority information may include a slice list that indicates the frequencies supported by each slice in order.

[0092] In some embodiments, for slice S1, two frequencies f1 and f2 support slice S1. The priority order may be frequency f1 followed by frequency f2. Meanwhile, for another slice S2, frequency f1 supports slice S2.

[0093] For each supported slice, the frequency of supporting that slice can be listed from highest to lowest priority.

[0094] For each supported slice, the frequency of supporting that slice can be listed from lowest to highest priority.

[0095] The number of entities in the frequency priority information can be the number of slices supported by the serving cell. Each entity is associated with a supported slice and includes the frequencies of the associated slices in sequence.

[0096] In some embodiments, frequency priority information may include a per-frequency list that indicates a priority value and the slice supported by that frequency for each supported frequency (e.g., S-NSSAI).

[0097] In some embodiments, for frequency f1, frequency f1 supports two slices S1 and S2. Meanwhile, for another frequency f2, slice S1 is supported by frequency f2. The priority value of frequency f1 is 2, and the priority value of frequency f2 is 3.

[0098] It should be noted that the priority value can be a positive integer or a positive value.

[0099] In some embodiments, a higher priority value can represent a higher priority. A lower priority value can represent a lower priority.

[0100] In some embodiments, a lower priority value can represent a higher priority. A higher priority value can represent a lower priority.

[0101] The number of entities in the entity list in the frequency priority information can be the number of frequencies supported by the serving cell. Each entity is associated with a supported frequency and includes the slice supported by the associated frequency (e.g., S-NSSAI) and the corresponding priority value of the associated frequency.

[0102] It should be noted that the priority value for each supported frequency can be reused or be the same as the traditional cell reselection priority and / or cell reselection sub-priority value for each supported frequency.

[0103] In some embodiments, frequency priority information may include a per-frequency list for each frequency indicating the supported slice (e.g., S-NSSAI). The order of the per-frequency entities may implicitly indicate priority.

[0104] In some embodiments, for frequency f1, frequency f1 supports two slices S1 and S2. Meanwhile, for another frequency f2, slice S1 is supported by frequency f2. The entity corresponding to frequency f1 is followed by the entity corresponding to frequency f2.

[0105] Entities at each frequency can be listed in order of lowest to highest priority. For example, the entity corresponding to frequency f2 has a higher priority than the entity corresponding to frequency f1. Alternatively, entities at each frequency can be listed in order of highest to lowest priority. For example, the entity corresponding to frequency f1 has a higher priority than the entity corresponding to frequency f2.

[0106] The number of entities per frequency in the entity list of the frequency priority information can be the number of frequencies supported by the serving cell. Each entity is associated with a supported frequency and includes the slice supported by the associated frequency (e.g., S-NSSAI).

[0107] In some embodiments, frequency priority information may include a combination of (at least) a slice and (at least) a frequency, indicating that each combination (e.g., one or more slices and one or more frequencies supporting that slice) has a corresponding priority value.

[0108] In some embodiments, the combination (S1, f1) can represent that frequency f1 supports slice S1, the combination (S2, f1, f2) can represent that frequencies f1 and f2 support slice S2, and the combination (S1, S3, f3) can represent that frequency f3 supports slices S1 and S3. The priority value of the combination (S1, f1) can be 2, the priority value of the combination (S2, f1, f2) can be 3, and the priority value of the combination (S1, S3, f3) can be 2.5.

[0109] It should be noted that the priority value can be a positive integer or a positive value.

[0110] In some embodiments, a higher priority value can represent a higher priority. A lower priority value can represent a lower priority.

[0111] In some embodiments, a lower priority value can represent a higher priority. A higher priority value can represent a lower priority.

[0112] The number of entities in the entity list of the frequency priority information may be, but is not limited to, the number of frequencies supported by the serving cell or the number of slices supported by the serving cell. Each entity may include (at least) one slice and (at least) one frequency supporting that (at least) one slice. Each entity may be associated with a priority value, or each entity may further include a priority value.

[0113] In some embodiments, frequency priority information may include a combination of (at least) a slice and (at least) a frequency, indicating the order of the combinations. The order of the combinations may implicitly indicate priority.

[0114] In some embodiments, the combination (S1, f1) can indicate that frequency f1 supports slice S1, the combination (S2, f1, f2) can indicate that frequencies f1 and f2 support slice S2, and the combination (S1, S3, f3) can indicate that frequency f3 supports slices S1 and S3. The frequency priority information can sequentially include combinations of (S1, f1), (S2, f1, f2), and (S1, S3, f3).

[0115] Entities at each frequency can be listed in order of lowest to highest priority. For example, combination (S1, S3, f3) has a higher priority than combination (S2, f1, f2), and combination (S2, f1, f2) has a higher priority than combination (S1, f1). Alternatively, entities at each frequency can be listed in order of highest to lowest priority. For example, combination (S1, f1) has a higher priority than combination (S2, f1, f2), and combination (S2, f1, f2) has a higher priority than combination (S1, S3, f3).

[0116] The number of entities in the frequency priority information may be, but is not limited to, the number of frequencies supported by the serving cell or the number of slices supported by the serving cell. Each entity may include (at least) one slice and (at least) one frequency supporting that (at least) one slice.

[0117] Frequency priority information for slice-based cell reselection can be provided to the UE in the following ways. After providing the frequency priority information to the UE (or the UE's AS layer), the UE (or the UE's AS layer) can perform slice-based cell reselection based on the frequency priority information.

[0118] In some embodiments, the UE may be pre-configured with frequency priority information.

[0119] In some embodiments, the UE may receive system information (e.g., SIB1, other SIs, slice-specific SIBs) or dedicated signaling (e.g., RRC messages, RRC release messages with / without suspend configuration) from the serving cell, including information on frequency priority.

[0120] System information may include cell-specific information such as frequency priority, which may be applied by a UE residing on a cell that broadcasts system information or by a UE that serves it.

[0121] System information may include area-specific information (e.g., associated with a slice-specific SIB), which includes information on frequency priorities from the serving RAN (or serving cell) associated with a given system information area ID (e.g., systemInformationAreaID). The UE may also determine whether to apply frequency priorities based on area information (e.g., area-specific information, system information area ID).

[0122] Dedicated signaling may include UE-specific frequency priority information that can be applied by a UE receiving dedicated signaling from a cell. The UE-specific frequency priority information received via dedicated signaling may override the cell-specific frequency priority information received via system information. In other words, when slice priority information is received via dedicated signaling (e.g., an RRC release message), the UE may ignore the frequency priority information received via system information (e.g., SIB). In some embodiments, the UE may jointly consider the UE-specific frequency priority information received via dedicated signaling and the cell-specific frequency priority information received via system information.

[0123] The serving cell that transmits / transmits frequency priority information can be an E-UTRA cell (e.g., via system information block type 24) or an NR cell (e.g., SIB4). Additionally, the proposed slice-based frequency priority / sub-priority information can also be transmitted via RRC messages of the E-UTRA protocol and / or RRC messages of the NR protocol. An E-UTRA cell is a cell that supports E-UTRA, particularly the E-UTRA protocol. An NR cell is a cell that supports NR, particularly the NR protocol.

[0124] NWs (e.g., public land mobile networks (PLMNs), stand-alone non-public networks (SNPNs), and public network integrated non-public networks (PNI-NPNs)) can be associated with frequency priority information. Additionally, the cell (or BS) can broadcast NW identifiers (e.g., PLMN ID, SNPN ID, PNI-NPN ID) and frequency priority information via system information (e.g., SIB1, other SIs, slice-specific SIBs). From the UE's perspective, the UE can select and apply frequency priority information based on the registered NW (identifier) ​​or the selected NW (identifier). It should be noted that the UE's upper layer (e.g., the UE's NAS layer) can determine the selected NW (identifier). The UE's upper layer (e.g., the UE's NAS layer) can determine the registered NW (identifier). The UE's upper layer (e.g., the UE's NAS layer) can send the selected NW identifier to the NW via the UE's RRC layer and the serving / hosted cell for registration. After registration, the UE can designate the selected NW identifier as the registered NW identifier.

[0125] In some embodiments, if the UE does not receive information about the frequency priority associated with the UE's expected slice, the UE may apply the default frequency priority of the UE's expected slice.

[0126] The default frequency priority of the expected slice for the UE can be (pre)configured to the UE.

[0127] The UE can be configured with a default frequency priority after receiving dedicated signaling (e.g., RRC message, NAS signaling) or system information (e.g., SIB1, other SIs, slice-specific SIBs).

[0128] The UE can receive the default frequency priority of the UE's expected slice and the dedicated signaling or system information of the UE's corresponding expected slice.

[0129] The UE can receive individual dedicated signaling and system information, one of which includes the default frequency priority of the UE's expected slice, and the other of which includes the corresponding UE's expected slice.

[0130] The UE can receive individual dedicated signaling sets, one of which may include the default frequency priority of the UE's expected slice, and the other of which may include the expected slice corresponding to the UE.

[0131] The UE can receive individual system information sets, one of which may include the default frequency priority of the UE's expected slice, and the other of which may include the UE's corresponding expected slice.

[0132] The UE can be pre-configured with the default frequency priority of the expected slice of the UE by the UE's NW or NAS layer.

[0133] The NAS layer of the UE can forward the default frequency priority of the expected slice of the UE to the AS layer of the UE.

[0134] In some embodiments, if the UE does not receive information about the frequency priority associated with the UE's expected slice, the UE may, but is not limited to, determine the frequency priority of each UE's expected slice, predefined rules, preconfigurations, and / or operator policies based on the associated S-NSSAI value.

[0135] Service area slice information.

[0136] The serving cell can provide the UE with slice information of the serving cell, thereby performing slice-based cell reselection. The slice information of the serving cell may include at least the slices and / or slice groups supported by the serving cell.

[0137] In some embodiments, slices may be indicated by S-NSSAI. Slice groups may be indicated by S-NSSAI, Slice Service Type (SST), or Slice Differentiator (SD). For example, slices in the same slice group may be associated with the same slice information, the same priority information, and / or the same frequency information (but are not limited thereto).

[0138] The UE can receive the slice information of the serving cell in the following ways.

[0139] The UE can receive system information (e.g., SIB1, SIB2, SIB3, SIB4, SIB5, slice-specific SIBs) that includes slice information of the serving cell from the serving cell. The slice information of the serving cell received in the system information can be common to the UE receiving the system information from the serving cell. After the UE receives the system information including the slice information of the serving cell, the UE can store the slice information of the storage cell.

[0140] In some embodiments, the UE may store cell-specific slice information of the serving cell for a period of time. This period may be a predefined value or may be configured by the serving cell. After this period, the UE may release the cell-specific slice information of the serving cell. It should be noted that the validity period of the cell-specific slice information of the serving cell may be designed to apply to the region-specific slice information of the serving cell (e.g., a region associated with a system information region ID, or slice information applicable to a specific region). After releasing the slice information of the serving cell or the region-specific slice information of the serving cell, the UE may reacquire the slice information.

[0141] In some embodiments, after the UE camps on or switches to the target cell, the UE may release cell-specific slice information of the (source) serving cell.

[0142] In some embodiments, when the UE has already stored the cell-specific slice information of the serving cell received through system information, and the UE receives the UE-specific slice information of the serving cell from the serving cell through dedicated signaling, the UE cannot replace the cell-specific slice information of the serving cell with the UE-specific slice information of the serving cell received through dedicated signaling.

[0143] In some embodiments, when the UE has already stored the cell-specific slice information of the serving cell received via system information, and the UE receives the UE-specific slice information of the serving cell from the serving cell via dedicated signaling, the UE can replace the cell-specific slice information of the serving cell with the UE-specific slice information of the serving cell received via dedicated signaling.

[0144] In some embodiments, when the UE has already stored the cell-specific slice information of the serving cell received via system information, if the UE receives new cell-specific slice information of the serving cell from the serving cell via system information, the UE can replace the cell-specific slice information of the serving cell with the newly received cell-specific slice information of the serving cell received via system information.

[0145] The UE can receive dedicated signaling (e.g., RRC messages, RRC release messages with / without a suspend configuration) from the serving cell, including slice information of the serving cell. The slice information of the serving cell received in the dedicated signaling can be UE-specific to the UE receiving the dedicated signaling. After receiving the dedicated signaling including the slice information of the serving cell, the UE can store the UE-specific slice information of the storage cell.

[0146] In some embodiments, the UE may store UE-specific slice information of the serving cell for a period of time. This period may be a predefined value or may be configured by the serving cell. After this period, the UE may release the UE-specific slice information of the serving cell.

[0147] In some embodiments, after the UE camps on or switches to the target cell, the UE may release UE-specific slice information of the (source) serving cell.

[0148] In some embodiments, when the UE has already stored the UE-specific slice information of the serving cell received via dedicated signaling, the UE cannot replace the UE-specific slice information of the serving cell with the cell-specific slice information of the serving cell received via system information when the UE receives the cell-specific slice information of the serving cell from the serving cell via system information.

[0149] In some embodiments, when the UE has already stored the UE-specific slice information of the serving cell received via dedicated signaling, the UE can replace the UE-specific slice information of the serving cell with the cell-specific slice information of the serving cell received via system information when the UE receives the cell-specific slice information of the serving cell from the serving cell via system information.

[0150] In some embodiments, when the UE has already stored UE-specific slice information of the serving cell received via dedicated signaling, if the UE receives new UE-specific slice information of the serving cell from the serving cell via dedicated signaling, the UE can replace the UE-specific slice information of the serving cell with the newly received UE-specific slice information of the serving cell received via dedicated signaling.

[0151] In some embodiments, the slicing information of the serving cell may be included in the frequency priority information (e.g., frequency priority information) provided by the serving cell to the UE. In some embodiments, the slicing information of the serving cell may be independent of the frequency priority information provided by the serving cell to the UE. That is, the slicing information and the frequency priority information of the serving cell may be separate information elements (IEs) provided by the serving cell to the UE.

[0152] Slice information of neighboring cells.

[0153] The UE can perform slice-based cell reselection by receiving slice information of neighboring cells from the serving cell. The slice information of neighboring cells may include at least the slices and / or slice groups supported by the neighboring cells. In some embodiments, a slice may be indicated by S-NSSAI. Slice groups may be indicated by S-NSSAI, SST, and / or SD. For example, slices in the same slice group may be associated with the same slice information of neighboring cells.

[0154] The slice information for neighboring cells may include a list of each neighboring cell. The list of each neighboring cell may be a list of specific entities of each neighboring cell. Each specific entity of a neighboring cell may include a cell identifier (e.g., a physical cell identifier, a globally unique cell identifier) ​​and associated slices and / or slice groups supported by the neighboring cells identified by that cell identifier.

[0155] The slice information of neighboring cells may include slices and / or slice groups that are supported by neighboring cells.

[0156] The slice information of neighboring cells may include two IEs: one IE may include at least one cell identifier that identifies the neighboring cell (e.g., physical cell identifier, globally unique cell identifier); the other IE may include at least one slice and / or slice group supported by the neighboring cell.

[0157] The UE can receive slice information from neighboring cells in the following ways.

[0158] The UE can receive system information (e.g., SIB1, SIB2, SIB3, SIB4, SIB5, slice-specific SIBs) that includes slice information of neighboring cells from the serving cell. The slice information of neighboring cells received in the system information can be common to UEs receiving system information from the serving cell. After receiving the system information including slice information of neighboring cells, the UE can store the slice information of neighboring cells.

[0159] In some embodiments, the UE may store cell-specific slice information of neighboring cells for a period of time. This period may be a predefined value or may be configured by the serving cell. After this period, the UE may release the cell-specific slice information of neighboring cells. It should be noted that the validity period design of cell-specific slice information of neighboring cells may also apply to area-specific slice information (e.g., a region associated with a system information area ID, or slice information applicable to a specific region). After the UE releases the cell-specific slice information or the area-specific slice information of neighboring cells, it can reacquire the slice information.

[0160] In some embodiments, after the UE camps on or switches to the target cell, the UE may release cell-specific slice information of neighboring cells provided by the (source) serving cell.

[0161] In some embodiments, when the UE has already stored the cell-specific slice information of the neighboring cell received via system information, the UE cannot replace the cell-specific slice information of the neighboring cell with the UE-specific slice information of the neighboring cell received via dedicated signaling when the UE receives the UE-specific slice information of the neighboring cell from the serving cell via dedicated signaling.

[0162] In some embodiments, when the UE has already stored the cell-specific slice information of the neighboring cell received via system information, and the UE receives the UE-specific slice information of the neighboring cell from the serving cell via dedicated signaling, the UE can replace the cell-specific slice information of the neighboring cell with the UE-specific slice information of the neighboring cell received via dedicated signaling.

[0163] In some embodiments, when the UE has already stored cell-specific slice information of neighboring cells received via system information, and the UE receives new cell-specific slice information of neighboring cells from the serving cell via system information, the UE can replace the cell-specific slice information of neighboring cells with the newly received cell-specific slice information of neighboring cells received via system information.

[0164] The UE can receive dedicated signaling (e.g., RRC messages, RRC release messages with / without a suspend configuration) from the serving cell, including slice information of neighboring cells. The slice information of neighboring cells received in the dedicated signaling can be UE-specific to the UE receiving the dedicated signaling. After receiving dedicated signaling including slice information of neighboring cells, the UE can store the UE-specific slice information of neighboring cells.

[0165] In some embodiments, the UE may store UE-specific slice information of neighboring cells for a period of time. This period may be a predefined value or may be configured by the serving cell. After this period, the UE may release the UE-specific slice information of neighboring cells.

[0166] In some embodiments, after the UE camps on or switches to the target cell, the UE may release UE-specific slice information of neighboring cells provided by the (source) serving cell.

[0167] In some embodiments, when the UE has already stored UE-specific slice information of neighboring cells received via dedicated signaling, and the UE receives cell-specific slice information of neighboring cells from the serving cell via system information, the UE cannot replace the UE-specific slice information of neighboring cells with the cell-specific slice information of neighboring cells received via system information.

[0168] In some embodiments, when the UE has already stored UE-specific slice information of neighboring cells received via dedicated signaling, and the UE receives cell-specific slice information of neighboring cells from the serving cell via system information, the UE can replace the UE-specific slice information of neighboring cells with the cell-specific slice information of neighboring cells received via system information.

[0169] In some embodiments, when the UE has already stored UE-specific slice information of neighboring cells received via dedicated signaling, and the UE receives new UE-specific slice information of neighboring cells from the serving cell via dedicated signaling, the UE can replace the UE-specific slice information of neighboring cells with the newly received UE-specific slice information of neighboring cells received via dedicated signaling.

[0170] In some embodiments, the slice information of neighboring cells may be included in the frequency priority information (e.g., frequency priority information) provided by the serving cell to the UE. In some embodiments, the slice information of neighboring cells may be independent of the frequency priority information provided by the serving cell to the UE. That is, the slice information and the frequency priority information of neighboring cells may be separate information provided by the serving cell to the UE.

[0171] NWs (e.g., PLMN, SNPN, PNI-NPN) can be associated with slice information of neighboring cells. Additionally, a cell (or BS) can broadcast NW identifiers (e.g., PLMN ID, SNPN ID, PNI-NPN ID) and related slice information of neighboring cells via system information (e.g., SIB1, other SIs, slice-specific SIBs). From the UE's perspective, the UE can select and apply slice information of neighboring cells based on the registered NW (identifier) ​​or the selected NW (identifier). It should be noted that the UE's upper layer (e.g., the UE's NAS layer) can determine the selected NW (identifier). The UE's upper layer (e.g., the UE's NAS layer) can determine the registered NW (identifier). The UE's upper layer (e.g., the UE's NAS layer) can send the selected NW identifier to the NW via the UE's RRC layer and the serving / hosted cell for registration. After registration, the UE can determine the selected NW identifier as the registered NW identifier.

[0172] Cell reselection results based on slices.

[0173] The results of slice-based cell reselection can include, but are not limited to: 1. The UE (re)selects a suitable cell; 2. The UE (re)selects an acceptable cell; and 3. The UE continues to perform slice-based cell reselection.

[0174] The appropriate cell selected (re)by the UE through slice-based cell reselection can include any combination of the following features: 1. A suitable cell can support the expected slices for all UEs.

[0175] 2. A suitable cell can support the default slice of the UE that belongs to the expected slice of the UE.

[0176] 3. A suitable cell can support at least one of the UE's intended slices.

[0177] 4. Suitable cells can support default slices that do not belong to the expected slice of the UE.

[0178] 5. A suitable cell can support the selected slice for the UE used for slice-based cell reselection.

[0179] 6. A suitable neighborhood can meet the neighborhood selection criteria.

[0180] 7. The cell is not blocked (e.g., based on the latest information provided by the UE's NAS layer (to the UE's AS layer)).

[0181] 8. The cell is part of at least one tracking area (TA) that is not part of a list of prohibited tracking areas that is a PLMN selected by the UE (e.g., a PLMN chosen by the UE), a PLMN registered by the UE (e.g., a PLMN registered by the UE), or a PLMN in an equivalent list (e.g., based on the latest information provided by the UE's NAS layer to the UE's AS layer).

[0182] 9. For a UE not operating in SNPN Access Mode (AM), the appropriate cell is the PLMN selected by the UE, the PLMN registered by the UE, or part of the PLMN in the equivalent PLMN list, and for that PLMN: (1) the PLMN ID of the PLMN is broadcast by a cell without an associated CAG ID, and the CAG-only indication in the UE for that PLMN is absent or false, or (2) the allowed CAG list in the UE for that PLMN includes the CAG ID broadcast by the cell for that PLMN.

[0183] 10. For a UE operating in SNPN AM, the appropriate cell is either the SNPN selected by the UE or part of the SNPN the UE is registered with.

[0184] The acceptable cells selected by the UE through slice-based cell reselection can include any combination of the following features, but are not limited to: 1. Acceptable cells may not support any slices; 2. Acceptable cells may not support any UE's expected slice; 3. Acceptable cells may support default slices that do not belong to the expected slice of the UE; 4. Acceptable cells may not support the UE's selected slice; 5. An acceptable neighborhood may meet the neighborhood selection criteria; 6. Acceptable neighborhoods may not be prohibited; and / or 7. Acceptable cells may provide limited services to the UE (e.g., the UE may initiate emergency calls to and / or receive Earthquake and Tsunami Warning System (ETWS) and Commercial Mobile Alert System (CMAS) notifications from the acceptable cells).

[0185] In this disclosure, a UE performing slice-based cell reselection can be configured / provided with any combination of the following information, but is not limited thereto: 1. Slicing priority; 2. Frequency priority; 3. Slice information of the serving cell; and / or 4. Slice information of neighboring cells.

[0186] The UE can perform slice-based cell reselection based on slice priority, frequency priority, slice information of the serving cell and / or slice information of neighboring cells.

[0187] Slice-based cell reselection: Slice priority method.

[0188] Figure 1 This is a flowchart of slice-based cell reselection with slice priorities according to an embodiment of this disclosure. In step 102, slice priorities are configured / provided to the UE (e.g., via the previously mentioned slice priority information). For example, the slice priority information may indicate a list of slices including slices S1, S2, and S3. It can be assumed that slice S1 has the highest slice priority, while it can be assumed that slice S2 has an intermediate slice priority, and it can be assumed that slice S3 has the lowest slice priority. Figure 1 The slice priority is shown as S1>S2>S3. In step 104, the UE can base its decision on an assumed slice priority (e.g., such as...). Figure 1The slice priority (S1>S2>S3) is used to perform slice-based cell (re)selection. For example, the UE can select slice S1 before the other two slices. In step 106, the UE can (re)select a suitable or acceptable cell. The suitable or acceptable cell can support the selected slice S1. Figure 2 This is a flowchart of slice-based cell reselection according to an embodiment of the present disclosure. In step 202, when the UE selects a slice with the highest slice priority (e.g., through the priority value in the aforementioned slice priority information), the UE can perform cell selection on the highest priority frequency of the selected slice. It should be noted that the UE is configured / provided with frequency priority through the aforementioned frequency priority information. In step 204, the UE can determine whether a highest-ranked cell (or best cell) is found on the highest priority frequency in the previously mentioned slice priority information. In step 206, when the UE determines that a highest-ranked cell (or best cell) is found on the highest priority frequency, the UE can further determine whether the highest-ranked cell (or best cell) supports the selected slice. In step 208, when the UE determines that no highest-ranked cell (or best cell) is found on the highest priority frequency, or when the UE determines that the highest-ranked cell (or best cell) does not support the selected slice, the UE can determine the next highest-ranked cell (or next best cell) on the highest priority frequency of the selected slice, or determine the next highest-ranked cell (or best cell) on the next highest priority frequency of the selected slice. In step 210, when the UE determines that the highest-ranked cell (or best cell) supports the selected slice, the UE can select the highest-ranked cell (or best cell) as the appropriate cell.

[0189] It should be noted that when the UE determines that the highest-ranked cell (or best cell) does not support the selected slice, the UE can reselect another slice (e.g., the next highest slice priority in the slice priority information) or maintain the (re)selected slice (e.g., the highest slice priority in the slice priority information). Furthermore, the UE can determine the reselection priority of the frequency indicated in the frequency priority information based on the reselected slice, the slice priority in the slice priority information, and the frequency priority in the frequency priority information, in order to find a cell / frequency that supports the reselected slice. Therefore, the UE can perform slice-based cell reselection to find the (next) highest-ranked cell (or (next) best cell) on the highest priority frequency of a reselected slice based on the determined reselection priority.

[0190] The frequency reselection priority indicated in the frequency priority information is used to find frequencies that support reselection for a slice. The UE can determine the reselection priority of frequencies supporting reselection for a slice based on the slice priority associated with the slice to be reselected (e.g., the priority value in the frequency priority information). For example, the UE reselects slice S1, and two frequencies f1 and f2 support slice S1. For frequency f1, the priority value associated with slice S1 in the frequency priority information is "2". For frequency f2, the priority value associated with slice S1 in the frequency priority information is "3". Therefore, the UE can determine the reselection priority of frequency f1 as "2" and the reselection priority of frequency f2 as "3".

[0191] In some embodiments, the UE can determine the reselection priority of frequencies that do not support reselection or do not support the slices indicated in the slice priority information, based on the corresponding frequency priority indicated in the frequency priority information. It should be noted that the reselection priority of frequencies that support slice reselection is higher than the reselection priority of frequencies that do not support slice reselection or do not support the slices indicated in the slice priority information, to assist the UE in finding frequencies / cells that support slice reselection through slice-based cell reselection with slice priority.

[0192] Generally, there may be a trade-off between whether the slice supported by the (re)selected cell is the UE's favorite and whether the (re)selected cell has the best signal quality / strength. A slice prioritization approach could aim to enable the UE to (re)select the cell that supports the slice most advantageous to the UE and has the best / strongest signal quality / strength among all cells in the frequency range. However, if this objective cannot be achieved, a slice prioritization approach should at least enable the UE to (re)select a cell that supports the UE's desired or default slice, and the signal quality / strength of the (re)selected cell should be satisfactory to the UE. The time complexity, UE complexity, and signaling overhead of the slice prioritization approach should be acceptable.

[0193] Slice selection.

[0194] The UE can select a slice to perform slice-based cell reselection using a slice priority-based method. The UE can select a slice using a variety of methods.

[0195] For example, the UE can select a slice based on the slice priority indicated in the slice priority information.

[0196] The selected slice can be configured with the highest slice priority (in the UE's expected slice).

[0197] The selected slice can be configured with the lowest slice priority (in the UE's expected slices).

[0198] The selected slice can be configured with the highest slice priority (in the slice-based cell reselection of the UE's expected slice that has not yet been selected).

[0199] The selected slice can be configured with the lowest slice priority (in the expected slice of the UE that has not yet been selected in the slice-based cell reselection).

[0200] The selected slice can be the default slice.

[0201] Default slices can be predefined (e.g., eMBB slices).

[0202] The default slice can be configured / provided to the UE by the NW via the serving cell.

[0203] The default slice can be determined by each UE (e.g., by the NAS layer of the UE).

[0204] The selected slice can be randomly selected by the UE from the UE's expected slices.

[0205] The criteria for selecting the chosen slices can be different or the same under different conditions.

[0206] In some cases, during slice-based cell reselection, when the UE has not yet found a cell it is not satisfied with, the UE can select a slice based on slice priority. However, during slice-based cell reselection, when the UE finds a cell it is not satisfied with, the UE can then randomly select a slice from the UE's expected slices.

[0207] In some embodiments, during slice-based cell reselection, when the UE discovers an unsatisfactory cell that is not a suitable cell, the UE can then iteratively perform slice-based cell reselection based on another selected slice. This other selected slice is randomly chosen by the UE from its desired slices.

[0208] In some cases, during slice-based cell reselection, when the UE has not yet found any unsatisfactory cells, the UE can select the slice with the highest slice priority. However, during slice-based cell reselection, when the UE finds an unsatisfactory cell, the UE can then select the slice with the second highest slice priority.

[0209] An unsatisfactory cell can be a cell that fails to meet certain requirements. For example, an unsatisfactory cell may not be a suitable cell, an unsatisfactory cell may not be an acceptable cell, an unsatisfactory cell may be prohibited, and / or an unsatisfactory cell may not meet the requirements for slice-based cell reselection with slice priority.

[0210] The details of the UE performing slice-based cell reselection are disclosed below.

[0211] After selecting a slice, the UE can also determine the priority of the frequencies supporting the selected slice. If the UE is configured / provided with slice information of the serving cell (e.g., indicated in the frequency priority) and / or slice information of neighboring cells (e.g., indicated in the frequency priority information), the UE can determine the frequency priority based on the frequency priority information (e.g., the previously mentioned frequency priority information). Generally, the UE can determine the highest priority frequency supporting the selected slice. If the UE is not configured / provided with a frequency priority for the selected slice, the UE can determine the frequency on which it is currently operating as the highest priority frequency. If the UE is not configured / provided with a frequency priority for the selected slice, the UE can apply the default frequency priority of the selected slice. After the UE determines the frequency priority, the UE can perform cell search (e.g., cell measurement) on the highest priority frequency.

[0212] If the UE is configured / provided with slice information of the serving cell and / or slice information of neighboring cells, the UE can (re)select a frequency based on frequency priority information.

[0213] If the UE is not configured / provided with frequency priority information, the UE can send an RRC message (e.g., an RRC system information request message) to request frequency priority information from the serving cell.

[0214] If the UE is not configured / provided with slice information of the serving cell, the UE can send an RRC message (e.g., an RRC system information request message) to request slice information of the serving cell from the serving cell.

[0215] If the UE is not configured / provided with slice information of neighboring cells, the UE can send an RRC message (e.g., an RRC system information request message) to request slice information of neighboring cells from the serving cell.

[0216] If the UE is not configured / provided with frequency priority information, the UE can apply the default configuration / value / setting of frequency priority from the serving cell.

[0217] If the UE is not configured / provided with serving cell slice information, the UE can apply the default configuration / value / setting of the serving cell slice information.

[0218] If the UE is not configured / provided with slice information of neighboring cells, the UE can apply the default configuration / values / settings of slice information of neighboring cells.

[0219] During cell search (e.g., cell measurement) on the highest priority frequency, the UE can determine whether a top-ranked or best cell can be found on the highest priority frequency. It should be noted that the UE can determine the top-ranked cell based on the R standard in 3GPP Technical Specification (TS) 38.304 v16.1.0. In some embodiments, the best cell may be the cell with the strongest signal strength or signal quality on that frequency.

[0220] After the UE determines that it has found the highest-ranked cell or the best cell on the highest priority frequency, the UE can also determine whether the highest-ranked cell or the best cell supports the selected slice. However, the highest-ranked cell or the best cell may or may not support the selected slice.

[0221] In some embodiments, when the highest priority frequency is a licensed frequency and all cells in the same Tracking Area (TA) or Registration Area (RA) support the same slice, the UE can determine that the highest-ranked cell or the best cell supports the selected slice.

[0222] In some embodiments, (1) when the highest priority frequency is an unlicensed frequency, (2) when the highest priority frequency is a licensed frequency and all cells in the same TA or the same RA support the same slice, and / or (3) when the highest priority frequency is a licensed frequency, but all cells in the same TA or the same RA may not support the same slice, the UE may determine that the highest-ranked cell or the best cell does not support the selected slice.

[0223] After the UE determines that the highest-ranked cell or best cell on the highest priority frequency supports the selected slice and is appropriate, the UE can select the highest-ranked cell or best cell as the result of slice-based cell reselection.

[0224] After the UE determines that the highest-ranked cell or best cell on the highest priority frequency supports the selected slice and is acceptable, the UE can select the highest-ranked cell or best cell as the result of slice-based cell reselection.

[0225] However, under certain circumstances, the UE can continue to perform slice-based cell reselection.

[0226] In some embodiments, after the UE determines that it cannot find the highest-ranked cell or the best cell on the highest priority frequency, the UE may continue to perform slice-based cell reselection.

[0227] In some embodiments, after the UE determines that the highest-ranked cell or best cell found on the highest priority frequency is unsuitable, the UE may continue to perform slice-based cell reselection.

[0228] In some embodiments, after the UE determines that the highest-ranked or best cell found on the highest priority frequency is neither suitable nor acceptable, the UE may proceed with slice-based cell reselection. In some embodiments, after the UE determines that the highest-ranked cell or best cell found on the highest priority frequency does not support the selected slice, the UE may continue to perform slice-based cell reselection.

[0229] The UE may determine to perform conventional cell reselection (e.g., cell reselection without considering slice information, such as in 3GPPTS 38.304 v16.1.0) and / or enter the "Any Cell Selection" sub-state when certain conditions occur. When the UE enters the Any Cell Selection sub-state, the UE may continue to perform conventional cell reselection or slice-based cell reselection. If the UE determines to perform conventional cell reselection, the UE may aim to reselect a suitable or acceptable cell in the Any Cell Selection sub-state. If the UE determines to perform slice-based cell reselection, the UE may aim to reselect a suitable cell that supports the UE's expected slice, a suitable cell that may not support the UE's expected slice, an acceptable cell that supports the UE's expected slice, or an acceptable cell that may not support the UE's expected slice.

[0230] In some embodiments, after the UE determines that it cannot find the highest-ranked cell or the best cell on the highest priority frequency, the UE may perform conventional cell reselection and / or enter any cell selection sub-state.

[0231] In some embodiments, after the UE determines that the highest-ranked cell or the best cell found on the highest priority frequency is not suitable, the UE may perform conventional cell reselection and / or enter an arbitrary cell selection sub-state.

[0232] In some embodiments, after the UE determines that the highest-ranked cell or best cell found on the highest priority frequency is neither suitable nor acceptable, the UE may perform conventional cell reselection and / or enter an arbitrary cell selection substate.

[0233] In some embodiments, after the UE determines that the highest-ranked cell or best cell found on the highest priority frequency does not support the selected slice, the UE may perform conventional cell reselection and / or enter the arbitrary cell selection sub-state.

[0234] When the UE enters the arbitrary cell selection sub-state, the UE can perform traditional cell reselection and / or slice-based cell reselection, with the goal of selecting a suitable or acceptable cell.

[0235] Generally, the highest priority frequency can refer to the first frequency. The highest-ranked or best cell on the highest priority frequency can refer to the first cell. Furthermore, details are disclosed regarding how the UE continues slice-based cell reselection based on the next (or second) cell and / or the next (or second) frequency.

[0236] It was determined that the UE behavior following slice-based cell reselection would continue.

[0237] If the UE continues to perform slice-based cell reselection (e.g., when the first cell is determined not to be eligible for selection as a result of slice-based cell reselection), the UE can determine the next (or second) cell and then further determine whether that next cell meets or is eligible as a result of slice-based cell reselection. Several examples for the UE to determine the next (or second) cell are disclosed.

[0238] In some embodiments, the UE may also determine whether to apply cell reselection based on the same frequency or cell reselection based on the next frequency, and then perform the corresponding slice-based cell reselection.

[0239] It should be noted that if the UE applies cell reselection based on the same frequency, the first cell and the next (or second) cell are on the same frequency.

[0240] It should be noted that if the UE applies cell reselection based on the next frequency, the first cell and the next (or second) cell are on different frequencies. In some embodiments, the frequency in which the first cell operates has a higher priority than the frequency in which the second cell operates.

[0241] In some embodiments, the UE may perform cell reselection based on the same frequency instead of cell reselection based on the next frequency.

[0242] In some embodiments, the UE may perform cell reselection based on the next frequency instead of cell reselection based on the same frequency.

[0243] In some embodiments, when the UE determines to perform cell reselection based on the same frequency, the UE may identify the next (or second) highest-ranking cell or the next (or second) best cell on the first frequency (e.g., the highest priority frequency) as the next (or second) cell.

[0244] The next (or second) highest-ranked cell can refer to the cell whose ranking (based on the R standard in 3GPP TS 38.304v16.1.0) is after the highest-ranked cell.

[0245] The next (or second) highest-ranking cell can be the cell whose ranking (based on the R standard in 3GPP TS 38.304v16.1.0) is after the highest-ranking cell. Furthermore, the ranking of the next (or second) highest-ranking cell should be higher than or equal to a ranking threshold. The ranking threshold is predefined or configured to the UE by the serving cell (e.g., via system information, via dedicated signaling).

[0246] The next (or second) highest-ranked cell can be the cell whose ranking (based on the R standard in 3GPP TS 38.304v16.1.0) follows the highest-ranked cell. Furthermore, the signal quality / strength of the second-highest-ranked cell should be higher than or equal to a signal quality / strength threshold. This threshold is predefined or configured to the UE by the serving cell (e.g., via system information, via dedicated signaling).

[0247] The cell following or immediately after the best cell in terms of signal quality / strength.

[0248] The next (or second) best cell can refer to the cell whose signal quality / strength immediately follows that of the best cell. Furthermore, the signal quality / strength of the next (or second) best cell should be higher than or equal to a signal quality / strength threshold. This threshold is predefined or configured to the UE by the serving cell (e.g., via system information, via dedicated signaling).

[0249] The next (or second) best cell can be a cell whose signal quality / strength closely follows that of the best cell. Furthermore, the ranking of the next (or second) best cell should be higher than or equal to a ranking threshold. The ranking threshold is predefined or configured to the UE by the serving cell (e.g., via system information, via dedicated signaling).

[0250] If the UE cannot determine the next (or second) cell (e.g., the next (or second) highest-ranked cell or the next (or second) best cell) in a cell reselection based on the same frequency (e.g., if the first cell is operating on the highest priority frequency, then the next (or second) cell should be determined on the highest priority frequency), the UE can determine whether the next (or second) frequency of the selected slice (e.g., the next (or second) highest priority frequency) exists.

[0251] If the UE determines the next (or second) highest priority frequency of the selected slice, the UE can perform cell reselection based on the next frequency.

[0252] If the UE cannot determine the next (or second) cell in a co-frequency-based cell reselection (e.g., the next (or second) highest-ranking cell or the next (or second) best cell) (e.g., if the first cell operates on the highest priority frequency, the next (or second) cell should be determined on the highest priority frequency), the UE can reselect a slice. The rules for the UE to reselect a slice can be the same as or different from the rules for the UE to select a slice. The reselected slice can be the same as or different from the selected slice. After the UE reselects a slice, the UE can perform slice-based cell reselection, co-frequency-based cell reselection, and / or next-frequency-based cell reselection.

[0253] If the UE cannot determine the next (or second) cell in the same-frequency cell reselection (e.g., the next (or second) highest-ranked cell or the next (or second) best cell) (e.g., if the first cell is operating on the highest priority frequency, then the next (or second) cell should be determined on the highest priority frequency), the UE can enter the cell reselection sub-state.

[0254] In the cell reselection sub-state, the UE can continue to perform traditional cell reselection or slice-based cell reselection for suitable or acceptable cells.

[0255] In some embodiments, the UE may select the next (or second) cell as the result of slice-based cell reselection.

[0256] In some cases, after the UE determines that the next (or second) cell on the frequency supports the selected slice and is appropriate, the UE can select that next (or second) cell as the result of slice-based cell reselection.

[0257] In some cases, after the UE determines that the next (or second) cell on the frequency supports the selected slice and is acceptable, the UE can select that next (or second) cell as the result of slice-based cell reselection.

[0258] In some cases, after the UE determines that the next (or second) cell on the frequency supports the selected slice, the UE can select that next (or second) cell as the result of slice-based cell reselection.

[0259] In some embodiments, after the UE determines that the next (or second) cell on the frequency is appropriate, the UE can select that next (or second) cell as the result of slice-based cell reselection.

[0260] In some embodiments, after the UE determines that the next (or second) cell on the frequency is acceptable, the UE can select that next (or second) cell as the result of slice-based cell reselection.

[0261] In some embodiments, the UE may not select the next (or second) cell as the result of slice-based cell reselection.

[0262] In some cases, after the UE determines that the next (or second) cell on the frequency does not support the selected slice, the UE may not select that next (or second) cell as the result of slice-based cell reselection.

[0263] In some cases, after the UE determines that the next (or second) cell on the frequency supports the selected slice but is not suitable, the UE may not select that next (or second) cell as a result of slice-based cell reselection.

[0264] In some cases, after the UE determines that the next (or second) cell on the frequency supports the selected slice but is unacceptable, the UE may not select that next (or second) cell as a result of slice-based cell reselection.

[0265] In some cases, when the UE determines that the next (or second) cell on a frequency is unsuitable, the UE may choose not to select that next (or second) cell as the result of the slice-based cell reselection.

[0266] In some embodiments, after the UE determines that the next (or second) cell on the frequency is unacceptable, the UE may not select the next (or second) cell as the result of slice-based cell reselection.

[0267] If the UE determines not to select the next (or second) cell as the result of slice-based cell reselection, the UE may perform one or more of the following actions: 1. Continue cell reselection based on the same frequency; 2. Continue with cell reselection based on the next frequency; 3. Continue with the re-election of traditional neighborhoods; 4. Lower the frequency priority of the next (or second) cell; 5. If the number of cell reselection attempts on a frequency (e.g., the number of unsatisfactory cells, the number of (next or second) cells the UE attempts) exceeds a pre-configured threshold, the priority frequency of the frequency in which the next (or second) cell operates is reduced. 6. Reduce the frequency priority of the next (or second) cell for a period of time (e.g., 300 seconds); and / or 7. Enter the sub-state of the community selection.

[0268] If the UE determines not to select the next (or second) cell as the result of slice-based cell reselection, the UE may further determine whether the number of cells considered by the UE in slice-based cell reselection, intra-frequency cell reselection, and / or next-frequency cell reselection is greater than or equal to a value. This value is predefined or configured to the UE by the serving cell (e.g., via system information, via dedicated signaling).

[0269] In some embodiments, if the value is 2, and the UE has already considered two cells in slice-based cell reselection, but these two cells still do not meet the requirements for selection in slice-based cell reselection, the UE may stop performing slice-based cell reselection, intra-frequency cell reselection, and / or next-frequency cell reselection for a period of time. This period may be predefined (e.g., 300 seconds) or configured / provided to the UE by the serving cell.

[0270] In some embodiments, if the value is 2, and the UE considers two cells in slice-based cell reselection, co-frequency-based cell reselection, and / or next-frequency-based cell reselection, but these two cells still do not meet the requirements for being selected as slice-based cell reselection results, then the UE can enter the cell selection sub-state. In some embodiments, if the value is 2, and the UE considers two cells in the same-frequency-based cell reselection, but these two cells still do not meet the requirements for selection in the slice-based cell reselection, the UE can reduce the priority of the frequencies in which these two cells operate (e.g., reduce them to the lowest frequency priority) for a period of time. This period can be predefined (e.g., 300 seconds) or configured / provided to the UE by the serving cell. After this, the UE can choose to continue or not continue performing the next-frequency-based cell reselection.

[0271] In some embodiments, if the value is 2, and the UE considers two cells in the same-frequency cell reselection, but these two cells still do not meet the requirements for being selected as the cell reselection result based on slice, the UE can continue to perform cell reselection based on the next frequency.

[0272] In some embodiments, when the UE determines to perform cell reselection based on the next frequency, the UE may identify the highest-ranking or best cell on the next frequency (e.g., the next (or second) highest priority frequency of the selected slice) as the next (or second) cell. That is, the next frequency is a different frequency than the frequency at which the UE performs cell search (or cell measurement) for the first cell.

[0273] The highest-ranked cell can be the cell whose ranking (based on the R standard in 3GPP TS 38.304 v16.1.0) is the highest among all cells on the next (or second) highest priority frequency of the selected slice. The highest-ranked cell can be the cell whose ranking (based on the R standard in 3GPP TS 38.304 v16.1.0) is the highest among all cells on the next (or second) highest priority frequency of the selected slice. Furthermore, the ranking of the highest-ranked cell should be higher than or equal to a ranking threshold. The ranking threshold is predefined or configured to the UE by the serving cell (e.g., via system information, via dedicated signaling).

[0274] The highest-ranked cell can be the cell whose ranking (based on the R standard in 3GPP TS 38.304 v16.1.0) is the highest among all cells on the next (or second) highest priority frequency of the selected slice. Furthermore, the signal quality / strength of the highest-ranked cell should be higher than or equal to a signal quality / strength threshold. This threshold is predefined or configured to the UE by the serving cell (e.g., via system information, via dedicated signaling).

[0275] The best cell can be the cell with the best signal quality / strength among all cells on the next (or second) highest priority frequency of the selected slice.

[0276] The best cell can refer to the cell with the best signal quality / strength among all cells on the next (or second) highest priority frequency in the selected slice. Furthermore, the signal quality / strength of the best cell should be higher than or equal to a signal quality / strength threshold. This threshold is predefined or configured to the UE by the serving cell (e.g., via system information, via dedicated signaling).

[0277] The best cell can refer to the cell with the best signal quality / strength among all cells on the next (or second) highest priority frequency in the selected slice. Furthermore, the ranking of the best cell should be higher than or equal to a ranking threshold. The ranking threshold is predefined or configured to the UE by the serving cell (e.g., via system information, via dedicated signaling).

[0278] The next frequency can be (but is not limited to) the frequency of the next (or second) highest priority frequency of the selected slice compared to the frequency of the first cell operation. That is, for the selected slice, the priority of the highest priority frequency is followed by the priority of the next (or second) highest priority frequency.

[0279] The next frequency can be (but is not limited to) the frequency of the highest priority frequency of another selected slice.

[0280] Another option is the default slice.

[0281] Another selected slice can have a lower or higher slice priority than the selected slice. The slice priority of another selected slice can be followed by the slice priority of the selected slice.

[0282] The slice priority of the selected slice can be followed by the slice priority of other selected slices.

[0283] If the UE cannot determine the next frequency and / or the next cell in the next frequency-based cell reselection (e.g., only one frequency supports the selected slice), the UE can reselect a slice. The rules for the UE to reselect a slice can be the same as or different from the rules for selecting a slice. The reselected slice can be the same as or different from the selected slice. After the UE reselects a slice, the UE can perform slice-based cell reselection, intra-frequency-based cell reselection, and / or next frequency-based cell reselection.

[0284] If the UE cannot determine the next frequency and / or the next cell for cell reselection based on the next frequency (e.g., only one frequency supports the selected slice), the UE can enter the cell selection sub-state.

[0285] In the cell reselection sub-state, the UE can continue to perform slice-based cell reselection to obtain a suitable or acceptable cell.

[0286] If the UE cannot determine the next frequency and / or the next cell in the cell reselection based on the next frequency (e.g., only one frequency supports the selected slice), the UE can continue to perform intra-frequency cell reselection on the same frequency, or the UE can continue to perform slice-based cell reselection on the same frequency.

[0287] In some embodiments, the UE may select the next (or second) cell on the next frequency as the result of slice-based cell reselection.

[0288] In some embodiments, after the UE determines that the next (or second) cell on the next frequency supports the selected slice and is appropriate, the UE can select the next (or second) cell as the result of slice-based cell reselection.

[0289] In some embodiments, after the UE determines that the next (or second) cell on the next frequency supports the selected slice and is acceptable, the UE can select the next (or second) cell as the result of slice-based cell reselection.

[0290] In some embodiments, after the UE determines that the next (or second) cell on the next frequency supports the selected slice, the UE can select the next (or second) cell as the result of slice-based cell reselection.

[0291] In some embodiments, after the UE determines that the next (or second) cell on the next frequency is appropriate, the UE can select the next (or second) cell as the result of the slice-based cell reselection.

[0292] In some embodiments, after the UE determines that the next (or second) cell on the next frequency is acceptable, the UE can select that next (or second) cell as the result of slice-based cell reselection.

[0293] In some embodiments, the UE may not select the next (or second) cell on the next frequency as the result of slice-based cell reselection.

[0294] In some cases, after the UE determines that the next (or second) cell on the next frequency does not support the selected slice, the UE may not select that next (or second) cell as the result of slice-based cell reselection. In some cases, after the UE determines that the next (or second) cell on the next frequency supports the selected slice but is not suitable, the UE may not select that next (or second) cell as the result of slice-based cell reselection.

[0295] In some cases, after the UE determines that the next (or second) cell on the next frequency supports the selected slice but is unacceptable, the UE may not select that next (or second) cell as the result of slice-based cell reselection.

[0296] In some cases, when the UE determines that the next (or second) cell on the next frequency is not suitable, the UE may not select that next (or second) cell as the result of the slice-based cell reselection.

[0297] In some cases, after the UE determines that the next (or second) cell on the next frequency is unacceptable, the UE may not select that next (or second) cell as the result of slice-based cell reselection.

[0298] If the UE determines not to select the next (or second) cell on the next frequency as the result of slice-based cell reselection, the UE may perform one or more of the following actions: 1. Continue to perform cell reselection based on the same frequency; 2. Continue performing cell reselection based on the next frequency; 3. Continue to implement traditional neighborhood re-election; 4. Lower the frequency priority of the next (or second) cell; 5. Reduce the frequency priority of the next (or second) cell for a period of time (e.g., 300 seconds); and / or 6. Enter the sub-state of the community selection.

[0299] If the UE determines not to select the next (or second) cell on the next frequency as the result of slice-based cell reselection, the UE can also determine whether the number of cells already considered in slice-based cell reselection, same-frequency cell reselection, and / or next-frequency cell reselection is greater than or equal to a value. This value is predefined or configured to the UE by the serving cell (e.g., via system information, via dedicated signaling).

[0300] In some embodiments, if the value is 2, and the UE considers two cells in slice-based cell reselection, but these two cells still do not meet the requirements for selection in slice-based cell reselection, the UE may stop performing slice-based cell reselection, intra-frequency cell reselection, and / or next-frequency cell reselection for a period of time. This period may be predefined (e.g., 300 seconds) or configured / provided to the UE by the serving cell.

[0301] In some embodiments, if the value is 2, and the UE considers two cells in slice-based cell reselection, co-frequency-based cell reselection, and / or next-frequency-based cell reselection, but these two cells still do not meet the requirements for being selected as slice-based cell reselection, then the UE can enter the cell selection sub-state.

[0302] In some embodiments, if the value is 2, and the UE considers two cells in the next-frequency-based cell reselection, but these two cells still do not meet the requirements for selection in the slice-based cell reselection, the UE can reduce the priority of the frequencies in which these two cells operate for a period of time (e.g., reduce it to the lowest frequency priority). This period can be predefined (e.g., 300 seconds) or configured / provided to the UE by the serving cell. After this, the UE can choose to continue or not continue performing the next-frequency-based cell reselection. If the UE determines not to select the next (or second) cell on the next frequency as the result of slice-based cell reselection, the UE can also determine whether the number of frequencies the UE has considered in slice-based cell reselection, same-frequency cell reselection, and / or next-frequency cell reselection is greater than or equal to a value. This value is predefined or configured to the UE by the serving cell (e.g., via system information, via dedicated signaling).

[0303] In some embodiments, if the value is 3, and the UE considers 3 frequencies in slice-based cell reselection but still cannot find any cells that meet the criteria to be selected as the result of slice-based cell reselection, the UE may stop performing slice-based cell reselection, intra-frequency cell reselection, and / or next-frequency cell reselection for a period of time. This period of time may be predefined (e.g., 300 seconds) or configured / provided to the UE by the serving cell.

[0304] In some embodiments, if the value is 3, and the UE considers 3 frequencies in slice-based cell reselection but still cannot find any cells that meet the criteria to be selected as the result of slice-based cell reselection, the UE can enter any cell selection state.

[0305] In some embodiments, if the value is 3, and the UE considers 3 frequencies in slice-based cell reselection but still cannot find any cells that meet the criteria to be selected as the result of slice-based cell reselection, the UE can perform conventional cell reselection.

[0306] Terms such as NW, RAN, cell, hosted cell, serving cell, base station, gNB, eNB, and ng-eNB are used interchangeably. Some of these terms may refer to the same network entity.

[0307] The UE can apply the examples mentioned above to any RAT. The RAT can be (but is not limited to) NR, NR-U, LTE, E-UTRA connected to 5GC, LTE connected to 5GC, E-UTRA connected to EPC, and LTE connected to EPC. The UE can apply the examples mentioned above to public networks or private networks (e.g., NPN, SNPN, PNI-NPN).

[0308] The UE can apply the examples mentioned above to licensed or unlicensed frequencies.

[0309] System information (SI) can refer to MIB, SIB1, and other SIs. The minimum SI can include MIB and SIB1. Other SIs can refer to SIB3, SIB4, SIB5, and other SIBs.

[0310] Specialized signaling can refer to (but is not limited to) RRC messages. For example, RRC messages may include RRC (connection) establishment request messages, RRC (connection) establishment messages, RRC (connection) establishment completion messages, RRC (connection) reconfiguration messages, RRC connection reconfiguration messages including mobility control information, RRC connection reconfiguration messages without mobility control information, RRC reconfiguration messages including synchronization configuration, RRC reconfiguration messages without internal synchronization configuration, RRC (connection) reconfiguration completion messages, RRC (connection) recovery request messages, RRC (connection) recovery messages, RRC (connection) recovery completion messages, RRC (connection) reconstruction request messages, RRC (connection) reconstruction messages, RRC (connection) reconstruction completion messages, RRC (connection) rejection messages, RRC (connection) release messages, RRC system information request messages, UE assistance information messages, UE capability query messages, and UE capability information messages. RRC messages can be a type of specialized signaling. UEs can receive RRC messages from the network via unicast / broadcast / multicast.

[0311] The RRC_CONNECTED UE, RRC_INACTIVE UE, and RRC_IDLE UE can apply the previously mentioned examples.

[0312] The RRC_CONNECTED UE can be configured with an active BWP that has a common search space configured to monitor system information or paging.

[0313] The UE can measure the cell's signal quality based on the Reference Signal Received Quality (RSRQ).

[0314] The UE can measure the cell signal strength based on the Reference Signal Received Power (RSRP) or the Received Signal Strength Indication (RSSI).

[0315] When the UE is in the RRC_INACTIVE state and is performing a small data transmission (SDT) procedure, the UE can perform slice-based cell reselection.

[0316] The UE can perform slice-based cell reselection with or without SNPN AM.

[0317] The frequencies previously mentioned in this disclosure can be indicated by ARFCN values.

[0318] If the expected slice of the UE is not (pre-)configured to the UE and the conditions for the UE to perform cell (re)selection are triggered, the UE can perform traditional cell (re)selection.

[0319] If the UE's intended slice is released or removed and the conditions for performing cell (re)selection are triggered, the UE can perform traditional cell (re)selection. For example, when the conditions for performing slice-based cell (re)selection are triggered (or met), but the UE's intended slice is released or removed, the UE can perform traditional cell (re)selection.

[0320] A UE in the RRC_INACTIVE state can periodically execute RNAU (e.g., when a timer expires).

[0321] When a specific event occurs, such as when the UE is camped in a cell that does not belong to the RNA configured for the UE, the UE in the RRC_INACTIVE state can execute RNAU.

[0322] A network identifier (NID) can represent the identifier of an SNPN combined with a PLMN ID.

[0323] NPN can refer to a network deployed for non-public use.

[0324] The PNI-NPN identifier can represent an identifier for a PNI-NPN that includes a combination of PLMN ID and CAG (Closed Access Group) ID.

[0325] A registered SNPN can refer to an SNPN on which registration results have already occurred at certain locations.

[0326] The selected SNPN can refer to an SNPN that has been manually or automatically selected by the NAS (e.g., the NAS of the UE, the NAS of the CN).

[0327] SNPN AM can indicate that the UE selects only the SNPN operating mode.

[0328] An SNPN identifier can represent an identifier for an SNPN that includes a combination of PLMN ID and NID.

[0329] At least two frequencies can be configured with the same priority (e.g., highest priority). Therefore, the terms "highest priority frequency" and "a plurality of highest priority frequencies" are used interchangeably in this disclosure. More specifically, the terms "frequency" and "a plurality of frequencies" are used interchangeably in this disclosure.

[0330] The UE can receive RRC messages (e.g., RRC release messages with / without a suspend configuration) that include UE-specific information such as slice priority information, frequency priority information, serving cell slice information, and neighboring cell slice information. UE-specific information can be associated with a specific time period. The length of the specific time period can be predefined in the UE. Alternatively, the UE can receive the length of the specific time period in the same RRC message that includes the associated UE-specific information. For example, when the UE receives (or is configured with) associated UE-specific information (or afterward), the UE can (re)start a timer with an initial value that is the same as the length of the time period.

[0331] For example, the UE can (only) maintain (and / or apply) UE-specific information while the timer is running.

[0332] For example, when the timer expires, the UE can release (or remove) the associated UE-specific information. In some embodiments, when the timer expires, the UE can stop applying the associated UE-specific information.

[0333] For example, after the UE releases or stops applying associated UE-specific information, the UE can apply cell-specific (or region-specific) information.

[0334] For example, a UE can receive system information that includes cell-specific (or region-specific) information (e.g., SIB1, other SIs, slice-specific SIBs), such as slice priority information, frequency priority information, slice information of the serving cell, slice information of neighboring cells, etc.

[0335] For example, when the UE determines that it does not apply associated UE-specific information, the UE can stop the timer.

[0336] The UE can apply the examples mentioned above to perform slice-based cell selection or slice-based cell reselection. Figure 3This is a flowchart of a method / process 300 for slice-based cell reselection according to an embodiment of the present disclosure. In action 302, the UE receives slice priority information, including at least one slice and at least one priority value associated with the at least one slice, from the UE's NAS layer via the UE's AS layer. In action 304, the UE receives frequency priority information from the serving cell, the frequency priority information including one or more slices, at least one frequency supporting the one or more slices, and one or more priority values ​​associated with the one or more slices. In action 306, the UE selects a first slice based on the slice priority information. In action 308, in response to selecting the first slice, the UE determines whether a cell on at least one frequency indicated in the frequency priority information supports the first slice, and the UE detects the cell according to a sorting criterion associated with signal strength measurement. In action 310, when the UE determines that the cell does not support the first slice, the UE reselects a second slice. In action 312, based on the second slice, the slice priority information, and the frequency priority information, the UE determines at least one reselection priority for the at least one frequency indicated in the frequency priority information.

[0337] In some embodiments, a first reselection priority is determined based on a first priority value indicated in the frequency priority information, among at least one reselection priority for a first frequency indicated in the frequency priority information. The first frequency supports a second slice, and the first priority value is associated with the second slice.

[0338] In some embodiments, the UE selects the first slice according to the order of priority values ​​indicated in the slice priority information.

[0339] In some embodiments, the UE receives frequency priority information via at least one of the SIB or RRC release messages.

[0340] In some embodiments, when frequency priority information is received via an RRC release message, the UE may ignore the frequency priority information received via the SIB.

[0341] In some embodiments, slice-based cell reselection is performed via cell search on a frequency having the highest reselection priority determined by the UE.

[0342] In some embodiments, the frequency priority information includes a list of entities per frequency, each entity corresponding to a frequency and including at least one slice supported by that frequency and a priority value associated with that at least one slice.

[0343] In some embodiments, the number of entities in the entity list per frequency is the number of frequencies that include at least the second and third frequencies.

[0344] In some embodiments, the first entity in the per-frequency entity list corresponds to a second frequency supported by the serving cell and includes at least one slice supported by the serving cell, and the second entity in the entity list corresponds to a third frequency supported by a neighboring cell and includes at least one slice supported by the neighboring cell.

[0345] In some examples, when the first priority value is higher than the second priority value associated with the second slice supported by the second frequency, the UE determines that the first reselection priority is higher than the second reselection priority of the second frequency indicated in the frequency priority information.

[0346] In some embodiments, the UE determines a second reselection priority of a second frequency indicated in the frequency priority information based on the frequency priority indicated in the frequency priority information, and the second frequency does not support at least one slice indicated in the slice priority information.

[0347] In some embodiments, the UE determines that the first reselection priority is higher than the second reselection priority of the second frequency indicated in the frequency priority information, and the second frequency does not support at least one slice indicated in the slice priority information or does not support the second slice.

[0348] Figure 4 This is a block diagram of a node 400 for wireless communication shown according to an embodiment of the present disclosure.

[0349] like Figure 4 As shown, node 400 may include a transceiver 420, a processor 428, a memory 434, one or more presentation components 438, and at least one antenna 436. Node 400 may also include a radio frequency (RF) band module, a BS communication module, a network communication module and a system communication management module, input / output (I / O) ports, I / O components, and a power supply. Figure 4 (Not shown in the image).

[0350] Each of these components can communicate with each other directly or indirectly via one or more buses 440. Node 400 can be an execution... Figures 1 to 3 The various disclosed functions and the UE or BS of the examples / implementations of this disclosure are shown.

[0351] Transceiver 420 may include transmitter 422 (with transmitting circuitry) and receiver 424 (with receiving circuitry), and may be configured to transmit and / or receive time and / or frequency resource allocation information. Transceiver 420 may be configured to transmit in different types of subframes and time slots, including but not limited to available, unavailable, and flexibly available subframe and time slot formats. Transceiver 420 may be configured to receive data and control channels. Node 400 may include various computer-readable media. Computer-readable media can be any media accessible to Node 400, and includes volatile (and non-volatile) media, removable (and non-removable) media. Computer-readable media may include computer storage media and communication media. Computer storage media may include volatile (and / or non-volatile) media and removable (and / or non-removable) media implemented in any method or technology for storing information such as computer-readable instructions, program modules, or data.

[0352] Computer storage media may include RAM, ROM, EPROM, EEPROM, flash memory (or other storage technologies), CD-ROM, DVD (or other optical disc storage), cassette tape, magnetic tape, disk storage (or other magnetic storage devices), etc. Computer storage media do not include transmitted data signals.

[0353] Communication media can typically embody computer-readable instructions, data structures, program modules, or other data in modulated data signals (e.g., carrier waves or other transmission mechanisms), and include any information transmission medium. The term "modulated data signal" can mean a signal having one or more characteristics set or altered in a manner that encodes information in the signal. Communication media can include wired media, such as wired networks or direct wired connections, and wireless media, such as acoustic, radio frequency, infrared, and other wireless media. Any combination of disclosed media should be included within the scope of computer-readable media.

[0354] Memory 434 may include computer storage media in the form of volatile and / or non-volatile memory. Memory 434 may be removable, non-removable, or a combination thereof. For example, memory 434 may include solid-state memory, hard disk drive, optical disk drive, etc. Figure 4 As shown, memory 434 may store computer-readable and / or computer-executable instructions 432 (e.g., software code) configured to cause processor 428 (e.g., processing circuitry) to perform various disclosed functions upon execution. Alternatively, instructions 432 may not be directly executed by processor 428, but may be configured to cause node 400 (e.g., during compilation and execution) to perform various disclosed functions. Processor 428 may include intelligent hardware devices, central processing units (CPUs), microcontrollers, ASICs, etc. Processor 428 may include memory. Processor 428 can process data 430 and instructions 432 received from memory 434, as well as information received via transceiver 420, baseband communication module, and / or network communication module. Processor 428 can also process information to be sent to transceiver 420 for transmission via antenna 436 and to be sent to network communication module for transmission to CN.

[0355] One or more presentation components 438 can present data to a person or other device. Presentation components 438 may include display devices, speakers, printing components, vibrating components, etc.

[0356] As will be apparent from this disclosure, various techniques can be used to implement the disclosed concepts without departing from their scope. Furthermore, while specific references to particular embodiments have been disclosed, those skilled in the art will recognize that changes in form and detail can be made without departing from the scope of these concepts. Therefore, this disclosure is to be considered illustrative rather than restrictive in all respects. It should also be understood that this disclosure is not limited to the specific embodiments disclosed, and many rearrangements, modifications, and substitutions can be made without departing from the scope of this disclosure.

Claims

1. A slice-based cell reselection method performed by a user equipment (UE), characterized in that, The method includes: The access layer (AS) of the UE receives slice priority information from the non-access layer (NAS) of the UE. This slice priority information includes at least one slice and at least one priority value associated with the at least one slice. Receive frequency priority information from the serving cell, the frequency priority information including one or more slices, at least one frequency supporting the one or more slices, and one or more priority values ​​associated with the one or more slices; The first slice among the at least one slices is selected based on the slice priority information; In response to selecting the first slice, it is determined whether a cell on the at least one frequency indicated in the frequency priority information supports the first slice, the cell being detected by the UE according to a sorting criterion associated with signal strength measurements; When the UE determines that the cell does not support the first slice, it reselects the second slice from the at least one slice; Based on the second slice, the slice priority information, and the frequency priority information, at least one reselection priority is determined for the at least one frequency indicated in the frequency priority information; and The slice-based cell reselection is performed by searching for cells on a specific frequency with the highest reselection priority determined by the UE. in: The first reselection priority of the first frequency among the at least one frequencies indicated in the frequency priority information is determined based on the first priority value among the one or more priority values ​​indicated in the frequency priority information. The first frequency supports the second slice, and The first priority value is associated with the second slice.

2. The method according to claim 1, characterized in that, The first slice is selected by the UE according to the order of at least one priority value indicated in the slice priority information.

3. The method according to claim 1, characterized in that, The frequency priority information is received from at least one of the System Information Block (SIB) or Radio Resource Control (RRC) release message.

4. The method according to claim 3, characterized in that, Also includes: When the frequency priority information is received via the RRC release message, the frequency priority information received via the SIB is ignored.

5. The method according to claim 1, characterized in that, The frequency priority information includes a list of entities per frequency, where each entity in the list corresponds to one of the at least one frequencies, and includes: At least one slice of the one or more slices supported by the one or more frequencies, and At least one priority value among the one or more priority values ​​associated with at least one slice of the one or more slices.

6. The method according to claim 5, characterized in that: The number of entities in the per-frequency entity list is equal to the number of the at least one frequency, which includes at least the second and third frequencies. The first entity in the per-frequency entity list corresponds to the second frequency supported by the serving cell, and includes at least one first slice supported by the serving cell. The second entity in the per-frequency entity list corresponds to the third frequency supported by the neighboring cell, and includes at least one second slice supported by the neighboring cell.

7. The method according to claim 1, characterized in that, When the first priority value is higher than the second priority value associated with the second slice supported by the second frequency, the first reselection priority is higher than the second reselection priority for the second frequency indicated in the frequency priority information.

8. The method according to claim 1, characterized in that, The second reselection priority of the second frequency indicated in the frequency priority information is determined based on the frequency priority indicated in the frequency priority information, and the second frequency does not support the at least one slice indicated in the slice priority information.

9. The method according to claim 1, characterized in that, The first reselection priority is higher than the second reselection priority of the second frequency indicated in the frequency priority information, and the second frequency does not support the at least one slice indicated in the slice priority information, or does not support the second slice.

10. A user equipment (UE) for performing slice-based cell reselection, the UE comprising: At least one processor; and At least one memory, coupled to the at least one processor and storing computer-executable instructions, which, when executed by the at least one processor, cause the UE to: The access layer (AS) of the UE receives slice priority information from the non-access layer (NAS) of the UE. This slice priority information includes at least one slice and at least one priority value associated with the at least one slice. Receive frequency priority information from the serving cell, the frequency priority information including one or more slices, at least one frequency supporting the one or more slices, and one or more priority values ​​associated with the one or more slices; The first slice among the at least one slices is selected based on the slice priority information; In response to selecting the first slice, it is determined whether a cell on the at least one frequency indicated in the frequency priority information supports the first slice, the cell being detected by the UE according to a sorting criterion associated with signal strength measurements; When the UE determines that the cell does not support the first slice, it reselects the second slice from the at least one slice; Based on the second slice, the slice priority information, and the frequency priority information, at least one reselection priority is determined for the at least one frequency indicated in the frequency priority information; as well as The slice-based cell reselection is performed by searching for cells on a specific frequency with the highest reselection priority determined by the UE. in: The first reselection priority of the first frequency among the at least one frequencies indicated in the frequency priority information is determined based on the first priority value among the one or more priority values ​​indicated in the frequency priority information. The first frequency supports the second slice, and The first priority value is associated with the second slice.

11. The UE according to claim 10, characterized in that, The first slice is selected by the UE according to the order of at least one priority value indicated in the slice priority information.

12. The UE according to claim 10, characterized in that, The frequency priority information is received from at least one of the System Information Block (SIB) or Radio Resource Control (RRC) release message.

13. The UE according to claim 12, characterized in that, When the computer-executable instructions are executed by the at least one processor, the UE is also made to: When the frequency priority information is received via the RRC release message, the frequency priority information received via the SIB is ignored.

14. The UE according to claim 10, characterized in that, The frequency priority information includes a list of entities per frequency, where each entity in the list corresponds to one of the at least one frequencies, and includes: At least one slice of the one or more slices supported by the one or more frequencies, and At least one priority value among the one or more priority values ​​associated with at least one slice of the one or more slices.

15. The UE according to claim 14, characterized in that: The number of entities in the per-frequency entity list is equal to the number of the at least one frequency, which includes at least the second and third frequencies. The first entity in the per-frequency entity list corresponds to the second frequency supported by the serving cell, and includes at least one first slice supported by the serving cell. The second entity in the per-frequency entity list corresponds to the third frequency supported by the neighboring cell, and includes at least one second slice supported by the neighboring cell.

16. The UE according to claim 10, characterized in that, When the first priority value is higher than the second priority value associated with the second slice supported by the second frequency, the first reselection priority is higher than the second reselection priority for the second frequency indicated in the frequency priority information.

17. The UE according to claim 10, characterized in that, The second reselection priority of the second frequency indicated in the frequency priority information is determined based on the frequency priority indicated in the frequency priority information, and the second frequency does not support the at least one slice indicated in the slice priority information.

18. The UE according to claim 10, characterized in that, The first reselection priority is higher than the second reselection priority of the second frequency indicated in the frequency priority information, and the second frequency does not support the at least one slice indicated in the slice priority information, or does not support the second slice.

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