CN114390613A - Method for slice-based access barring and user equipment using the same - Google Patents

Abstract

The present disclosure provides a method and user equipment for slice-based access barring. The method comprises the following steps: acquiring unicast non-access stratum signaling through a non-access stratum, wherein the unicast non-access stratum signaling comprises access category definitions corresponding to network slices; obtaining broadcast system information through an access layer, wherein the broadcast system information includes a local access category definition corresponding to a network slice; delivering, by the access stratum, the local access category definition to the non-access stratum; initiating an access attempt through a non-access stratum; determining, by the non-access stratum, an access category of the access attempt based on the access category definition and the local access category definition; and performing, by the access stratum, an access barring check on the access attempt according to the access category.

Description

Method for slice-based access barring and user equipment using the same

technical field

The present disclosure provides a method for slice-based access barring and a user equipment (UE) using the same.

Background technique

Network slicing is one of the key features of 5G communications. 3GPP specification TR 38.832 provides mechanisms to enable UEs to quickly access network slices supported by cells. Mechanisms include, for example, slice-based cell reselection, slice-based random access channel (RACH) configuration, or slice-based access barring under network control. Therefore, how to enhance those mechanisms is important to the field of communication technology.

SUMMARY OF THE INVENTION

The present disclosure provides a method for slice-based access barring and a UE using the same. The method may assist the UE to perform slice-based access barring in a more efficient manner.

A method for slice-based access barring is provided, the method being applicable to user equipment including an access stratum and a non-access stratum. The method includes: acquiring unicast non-access stratum signaling through the non-access stratum, wherein the unicast non-access stratum signaling includes an access class definition corresponding to the network slice; acquiring broadcast system information through the access stratum, wherein the broadcast system The information includes the local access class definition corresponding to the network slice; the local access class definition is delivered to the non-access stratum by the access stratum; the access attempt is initiated by the non-access stratum; according to the access class definition by the non-access stratum and the local access class definition to determine the access class of the access attempt; and perform an access barring check on the access attempt according to the access class by the access layer.

In an embodiment of the present disclosure, the method further includes: after acquiring the broadcast system information, acquiring second broadcast system information through the access layer, wherein the second broadcast system information includes a second local access class definition; The second local access class definition is delivered to the non-access stratum; and the local access class definition is updated to the second local access class definition by the non-access stratum.

In an embodiment of the present disclosure, the method further includes: after acquiring the broadcast system information, acquiring second broadcast system information through the access layer, wherein the second broadcast system information does not include a local access class definition; The access stratum notifies that there is no local access class definition in the second broadcast system information; and discards the local access class definition in response to the lack of the local access class definition in the second broadcast system information by the non-access stratum.

In the embodiment of the present disclosure, the access layer acquires the broadcast system information from the first base station, and the access layer acquires the second broadcast system information from the second base station after performing handover from the first base station to the second base station.

In the embodiment of the present disclosure, the broadcast system information further includes barring control information corresponding to the definition of the local access class, wherein the access layer performs access barring checking according to the barring control information.

In an embodiment of the present disclosure, wherein the local access class definition is associated with an operator defined access class.

A method for slice-based access barring is provided, the method being applicable to user equipment including an access stratum and a non-access stratum. The method includes: acquiring unicast non-access stratum signaling through a non-access stratum, wherein the unicast non-access stratum signaling includes an access class definition corresponding to a network slice; initiating an access attempt through the non-access stratum; The access stratum determines the access class of the access attempt according to the access class definition and the additional access class of the access attempt; and performs an access barring check on the access attempt according to the access class by the access stratum.

In an embodiment of the present disclosure, the method further includes: acquiring broadcast system information through an access layer, wherein the broadcast system information includes barring control information corresponding to the second additional access category; if the additional access category of the access attempt is equal to the first the access barring check is performed according to the barring control information; and if the additional access class of the access attempt is not equal to the second additional access class, then the access barring check is performed according to the second additional access class corresponding to the access class of the access attempt. Two barring control messages to perform access barring checks.

In an embodiment of the present disclosure, the unicast non-access stratum signaling includes a mapping relationship between additional access classes and network slices.

A user equipment (UE) for slice-based access barring is provided. The UE includes: a transceiver, a storage medium, and a processor. The storage medium includes an access layer and a non-access layer. The processor is coupled to the storage medium and the transceiver, wherein the processor is configured to obtain unicast non-access stratum signaling via the transceiver through the non-access stratum, wherein the unicast non-access stratum signaling includes a network slice corresponding to the access class definition; broadcast system information is obtained via the transceiver by the access stratum, wherein the broadcast system information includes the local access class definition corresponding to the network slice; the local access class definition is delivered by the access stratum to the non-access stratum ; initiate an access attempt by the non-access stratum; determine the access class of the access attempt by the non-access stratum according to the access class definition and the local access class definition; to perform access barring checks on access attempts.

A user equipment (UE) for slice-based access barring is provided. The UE includes a transceiver, a storage medium, and a processor. The storage medium includes an access layer and a non-access layer. The processor is coupled to the storage medium and to the transceiver, wherein the processor is configured to obtain unicast non-access stratum signaling via the transceiver through the non-access stratum, wherein the unicast non-access stratum signaling includes connections corresponding to network slices; access class definition; initiating the access attempt by the non-access stratum; determining the access class of the access attempt by the non-access stratum based on the access class definition and additional access classes of the access attempt; access class to perform access barring checks on access attempts.

Based on the above, the present disclosure may provide UEs with various classes of access class definitions. The UE may decide the access class of the access attempt by selecting one of the access class definitions according to the reception of the signaling. Therefore, even if the amount of signaling between the network and the UE is minimized, the network can order the UE to stop accessing the congested network slice at any time by signaling to the UE.

To make the foregoing easier to understand, several embodiments with accompanying drawings are described in detail below.

Description of drawings

The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure, and together with the description serve to explain principles of the present disclosure.

Figure 1 shows a signaling diagram for updating access class definitions.

Figure 2 shows a signaling diagram for updating inhibit control information.

3 illustrates a signaling diagram of a procedure for slice-based access barring according to an embodiment of the present disclosure.

4 illustrates a schematic diagram of determining an access category for an access attempt according to an embodiment of the present disclosure.

5 shows a schematic diagram of determining an access category for an access attempt according to another embodiment of the present disclosure.

FIG. 6 shows a schematic diagram of determining an access category for an access attempt according to another embodiment of the present disclosure.

7 illustrates a schematic diagram of UE AS behavior for updating local access class definitions according to an embodiment of the present disclosure.

8 illustrates a schematic diagram of UE AS behavior for updating local access class definitions according to another embodiment of the present disclosure.

9 illustrates a signaling diagram for obtaining barring control information associated with an additional access class definition according to an embodiment of the present disclosure.

10 illustrates a signaling diagram of a procedure for slice-based access barring according to an embodiment of the present disclosure.

11 illustrates a flowchart of a method for determining which prohibition control information to apply, according to an embodiment of the present disclosure.

12 shows a schematic diagram of access categories for access attempts according to an embodiment of the present disclosure.

13 illustrates a schematic diagram of access categories for access attempts according to another embodiment of the present disclosure.

14 shows a flowchart of a method for slice-based access barring according to an embodiment of the present disclosure.

15 shows a flowchart of a method for slice-based access barring according to another embodiment of the present disclosure.

16 shows a schematic diagram of a UE according to an embodiment of the present disclosure.

Explanation of reference numerals

11: core network;

12: wireless access network;

13: UE NAS;

14: gNB;

15: UE AS;

71, 72, 73, 82, 83: local access category definition;

100: UE;

110: processor;

120: storage medium;

121: access layer;

122: non-access layer;

130: transceiver;

S31, S32, S33, S34, S35, S91, S92, S93, S94, S101, S102, S103, S104, S105, S111, S112, S113, S114, S115, S116, S117, S141, S142, S143, S144, S145, S146, S151, S152, S153, S154: steps;

t1, t2, t3: time period;

T390: Timer.

Detailed ways

A network slice can be uniquely identified by a single network slice selection assistance information (S-NSSAI). The S-NSSAI may include a mandatory slice/service type (SST) field that identifies the type of network slice through 8-bit data. The S-NSSAI may further include an optional slice differentiator (SD) field consisting of 24-bit data. In some cases, the SST fields of different network slices may be the same, and the SD fields of different network slices may be different. For example, a network operator may deploy multiple network slices delivering the same features for different groups of UEs by having them configured with the same SST field but different SD fields.

The network may perform access control on UEs intending to access the network slice in order to restrict access control (UAC) functionality from UE's access attempt. A network operator can define multiple operator-defined access classes that can be used to enable differentiated handling of different network slices. The network may broadcast barring control information (ie, a series of barring parameters associated with operator-defined access classes) in order to minimize the impact of congested network slices.

Under high network load conditions, the network can protect itself from overload by performing unified access control according to the unified access control functionality. When eg the access and mobility management (AMF) function requests to limit the load of UEs accessing the network by sending an overload start message containing the conditions defined in clause 5.19.5.2 of the 3GPP specification TS 23.501 , the network can initiate such unified access control. For another example, the network may initiate unified access control if required by operation, administration, and maintenance (OAM) functions. For other instances, the network may trigger itself to initiate unified access control.

The unified access control framework is applicable to all UE states defined in 5G new radio (NR), such as "RRC_IDLE" state, "RRC_INACTIVE" state or "RRC_CONNECTED" state. The network may broadcast barring control information associated with one or more access classes. When the application layer of the UE generates an access attempt, the UE can determine whether the access class of the access attempt matches the operator-defined access class (or standardized access class). Specifically, the UE may store a mapping table of access classes. Table 1 is an example of a mapping table similar to Table 4.5.2.2 of 3GPP specification TS 24.501. If the access attempt matches the rules in the mapping table, the UE can determine the access category of the access attempt according to the rules. On the other hand, if the access attempt matches multiple rules in the mapping table, the UE may determine the access category of the access attempt according to the lowest rule number among the multiple rules.

Table 1

If the access attempt satisfies the requirements of multiple operator-defined access class definitions, the UE may decide the access attempt according to the operator-defined access class definition with the lowest priority value. An operator-defined access class definition may consist of parameters such as a priority value, an operator-defined access class number, a criterion consisting of one or more access class criterion types and associated access class criterion type values , or a standardized access category. Each operator-defined access class definition may have a different priority value. Different operator-defined access class definitions may have the same operator-defined access class number. The access class criterion type may include a data network name (DNN), a 5G quality of service identifier (5QI), an operating system identifier (OSId) that triggers an access attempt, The operating system specific application identifier (operating system specific application identifier; OSAppId) or S-NSSAI that triggers the access attempt. The standardized access class can be used in combination with the UE's access identity to determine the radio resource control (RRC) establishment reason.

One or more operator-defined access class definitions may be signaled to the UE via unicast non-access stratum (NAS) signaling. NAS signaling may be received by the UE's NAS, where the NAS signaling may be a "Registration Accept Message". The UE may obtain one or more operator-defined access class definitions from an operator-defined access class definition information element (information element; IE) included in the NAS signaling. After receiving the NAS signaling by the UE, the UE may feed back a response message to the AMF to confirm receipt of one or more operator-defined access class definitions, where the response message may be a "registration complete message". In one embodiment, the NAS signaling (or access class definition) may include a mapping relationship between network slices and access classes.

On the other hand, if the UE obtains the operator-defined access class definition information element from the "Configuration Update Command Message" received by the UE, and the operator-defined access class definition information contains one or more operator-defined The UE shall replace any operator-defined access class definitions stored for the registered public land mobile network (RPLMN) with the received operator-defined access class definitions. It should be noted that the maximum number of operator-defined access class definitions stored in the UE depends on the UE implementation.

After determining the access class of the access attempt, the UE may perform an access barring check on the network slice according to the access class and the unified access control barring parameter (ie barring control information) corresponding to the access class, where the unified access The control barring parameter may contain "uac-barringInfoSetIndex", "uac-BarringFactor", "uac-BarringTime" or "uac-BarringForAccessIdentity". The parameter "uac-BarringFactor" may represent the likelihood that an access attempt will be allowed during an access barring check. The parameter "uac-BarringTime" may represent the minimum time in seconds before a new access attempt is performed after barring an access attempt on an access barring check, where the access attempt and the new access attempt correspond to the same access attempt. into the category. The parameter "uac-BarringForAccessIdentity" may indicate whether an access attempt corresponding to a specific access identity is allowed. Table 2 is an example of the parameter "uac-BarringForAccessIdentity". For example, if "bit 0" of the bitmap received by the UE is equal to "0", the UE may decide to allow the access attempt corresponding to "Access Identity 1". If "bit 1" of the bitmap received by the UE is equal to "0", the UE may decide to allow the access attempt corresponding to "Access Identity 2".

Table 2

bitmap 0 1 2 3 4 5 6 Access ID 1 2 11 12 13 14 15

At least one of the access class and the unified access control barring parameter may be mapped via access stratum (AS) signaling (eg, RRC signaling), such as a system information block (SIB) The relationship is signaled to the UE. Table 3 is an example of the mapping relationship. The UE may perform access barring checks according to the access class and unified access control parameters, as depicted in the codes in Table 4 (referring to 3GPP specification TS38.331, clause 5.3.14.5).

table 3

Table 4

In order to perform slice-based access barring, the UE will dynamically update the access class definition and barring control information. Figure 1 shows a schematic diagram of updating access class definitions. The core network (or AMF) 11 may transmit NAS signaling to the UE through a radio access network (RAN) 12, where the NAS signaling may be a "UE configuration update command". The UE NAS (ie, the UE's NAS) 13 may receive the NAS signaling and may update the access class definition according to the NAS signaling. The update procedure in Figure 1 may only be used when the UE has an established 5G mobility management (5GMM) environment and the UE is in 5GMM connected mode. If the UE is in 5GMM-IDLE mode, the core network 11 may use a paging or notification procedure to initiate an update procedure for the UE.

Figure 2 shows a signaling diagram for updating inhibit control information. When network slice congestion occurs, the core network 11 may transmit a message such as an "overload start" message to the gNB 14 in order to indicate that the network slice is congested. The gNB 14 may include associated cells to the core network 11 . That is, core network 11 wants to limit access attempts from gNB 14 congested network slices. After receiving the "overload start" message, the gNB 14 may transmit an indication associated with the change in system information to the UE via a paging message or downlink control information (DCI), where the indication may be carried by AS signaling . The UE may be a concerned UE (concerned UE). That is, the UE may initiate an access attempt to a congested network slice. The UE AS (ie, the access stratum or RRC stratum of the UE) 15 may receive the indication and may perform a system information (SI) acquisition procedure with the gNB 14 according to the indication. The inhibition control information stored in the UE may be updated during the system information acquisition procedure. It should be noted that regardless of whether the UE is in the "RRC_IDLE", "RRC_INACTIVE" or "RRC_CONNECTED" state, the UE needs to monitor the paging messages (or DCI) in order to determine whether the system information has changed. The UE AS 15 may include an RRC layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a media access control (MAC) layer, or a physical (physical) layer. ; PHY) layer.

When network slice congestion occurs, the congested network slice should be mapped to an unused operator-defined access class or a barred operator-defined access class, and the network will inform the UE which network slice is congested. In some cases, the network may inform the UE which network slice is congested by sending the S-NSSAI corresponding to the congested network slice to the UE via AS signaling. However, according to Table 1, the maximum number of operator-defined access classes may be equal to only 32 (ie, the number of access classes: 32 to 63). Because S-NSSAI can contain 32-bit data, the maximum number of network slices defined by S-NSSAI can be equal to 2^32, which is much larger than the maximum number of operator-defined access classes. That is, S-NSSAI cannot be mapped to access classes in a one-to-one manner. Therefore, the network cannot indicate all network slices to the UE by just using operator defined access classes. On the other hand, the network may configure the UE to more frequently update the operator-defined access class definitions stored in the UE. The network may indicate a particular network slice to the UE by using one of the operator-defined access class definitions stored in the UE. However, frequently updating operator-defined access class definitions may increase signaling overhead.

3 illustrates a signaling diagram of a procedure for slice-based access barring according to an embodiment of the present disclosure. In an embodiment, the UE may pre-store at least one stored access class definition corresponding to at least one network slice, wherein the stored access class definition may be configured by unicast NAS signaling. For example, the core network 11 may transmit NAS signaling to the UE, where the NAS signaling may include the stored access class definitions. The UE may obtain the stored access class definitions by obtaining NAS signaling via the UE NAS 13 . The UE NAS 13 may store the stored access class definitions.

In step S31, when network slice congestion occurs, the core network 11 may map the congested network slice to a local access class definition, where the local access class definition may correspond to an operator-defined access class, such as an unused operation Operator Defined Access Class or Prohibited Operator Defined Access Class. Core network 11 may transmit a message (eg, an "overload start" message) to gNB 14 to indicate a congested network slice, wherein the message may contain at least one local access class definition. The gNB 14 may include several associated cells to the core network 11 . That is, the core network 11 wants to prevent the relevant cells belonging to the gNB 14 from initiating access attempts corresponding to congested network slices.

After receiving the "overload start" message, in step S32, the gNB 14 may transmit the broadcast system information associated with the change in system information to the UE via a paging message or downlink control information (DCI). The broadcast system information may contain a local access class definition and barring control information corresponding to the local access class definition. The UE may be a related UE. That is, the UE may initiate an access attempt to a congested network slice. The UE AS 15 of the UE may acquire the broadcast system information sent from the gNB 14 . In one embodiment, the broadcast system information may be carried by AS signaling such as a system information block (eg, SIB1 or SIBx as specified in the NR specification). Therefore, interference to unrelated UEs caused by system information updates (eg, paging messages) may be minimized.

In step S33, the UE AS 15 may perform a system information acquisition procedure with the gNB 14 according to the broadcast system information. In the system information acquisition procedure, the original barring control information stored in the UE may be updated based on barring control information carried by the broadcast system information, and local access class definitions may be provided to the UE. The UE AS 15 may obtain the local access class definition from the broadcast system information. Because the local access class definition or barring control information may be transmitted to the UE during the system information acquisition procedure, the core network 11 or gNB 14 may not need to transmit additional configuration update commands to the UE. Therefore, signaling traffic corresponding to the UE can be reduced.

In step S34, the UE AS 15 may deliver the local access class definition to the UE NAS 13. In step S35, the UE NAS 13 may add (or store) a local access class definition. It should be noted that the local access class definitions will not change the stored local access class definitions already stored in the UE NAS 13 .

When initiating an access attempt, the UE may determine the access class of the access attempt according to the stored access class definition or the local access class definition. Specifically, the UE NAS 13 may initiate an access attempt corresponding to a network slice. The access attempt may eg be generated by the application layer of the UE. The US NAS 13 may initiate an access attempt after receiving signaling from the UE's application layer.

The UE NAS 13 may decide the access class of the access attempt according to the stored access class definition or the local access class definition. If the local access class definition corresponding to the network slice is stored in the UE NAS 13, the UE NAS 13 may decide the access class of the access attempt according to the local access class definition. If no local access class definition is stored in the UENAS 13, the UE NAS 13 may determine the access class of the access attempt according to the stored access class definition in the UE NAS 13. After determining the access class of the access attempt, the UE NAS 13 may deliver the access class of the access attempt to the UEAS 15 . AS 15 may perform access barring checks on network slices according to the access class of the access attempt. The UE AS 15 may perform an access barring check based on barring control information corresponding to the access class of the access attempt.

4 illustrates a schematic diagram of determining an access category for an access attempt according to an embodiment of the present disclosure. Assume that the UE NAS 13 pre-stores the stored access class definitions associated with network slice "Slice A" and network slice "Slice B". During time period t1, since the local access class definition corresponding to network slice "slice A" is not stored in UE NAS 13, if an access attempt corresponding to network slice "slice A" is initiated, UE NAS 13 may The access class of the access attempt is determined according to the stored access class definition. For example, the UE NAS 13 may decide the access class of the access attempt as access class "AC 32" according to the stored access class definition. Therefore, during time period t1, UE AS 15 may perform an access barring check on network slice "Slice A" according to barring control information (eg, priority value "P=5") corresponding to access class "AC 32".

The barring control information may include at least one mapping relationship between an access class and a barring control parameter, where the barring control parameter may include a barring factor (eg, uac-BarringFactor), a barring time (eg, uac-BarringTime) or an access identifier (eg, uac-BarringForAccessIdentity). For example, NAS signaling and barring control information may include a mapping relationship between network slice "slice A", access class "AC 32", and priority value "P=5". Table 5 is an example of the content of barring control information and local access class definitions.

table 5

In one embodiment, NAS signaling (or access class definition) may map the same access class to different network slices. For example, NAS signaling may include both the mapping relationship between network slice "Slice A" and access class "AC 32" and the mapping relationship between network slice "Slice B" and access class "AC 32" .

Assume that network slice congestion occurs on network slice "slice A" after time period t1. The core network 11 may transmit broadcast system information to the UE AS 15 in order to inform the UE that the network slice "slice A" is congested. The UE AS 15 may obtain the broadcast system information, and the UE NAS 13 may obtain the local access class definition corresponding to the network slice "Slice A" from the broadcast system information. During time period t2, since at least one local access class definition corresponding to network slice "slice A" is stored in UE NAS 13, if an access attempt corresponding to network slice "slice A" is initiated, UE NAS 13 may The access class of the access attempt is determined according to the local access class definition. In other words, the access class of the access attempt may be updated by the UE NAS 13 according to the local access class definition. For example, UE NAS 13 may decide the access class of the access attempt as access class "AC 33" according to the local access class definition with priority value "P=3". Therefore, the UE AS 15 may perform an access barring check on the network slice "slice A" according to the access class "AC 33".

Assume that network slice congestion occurs on network slice "Slice A" after time period t2. The core network 11 may transmit the broadcast system information to the UE AS 15 in order to inform the UE that the network slice "slice A" is no longer congested, wherein the broadcast system information may not contain a local access class definition corresponding to the network slice "slice A" . The core network 11 may transmit broadcast system information, such as an "overload stop" message, via AS signaling. The UE AS 15 may acquire broadcast system information. Since the local access class definition corresponding to the network slice "Slice A" is not included in the broadcast system information, the UE NAS 13 may discard the local access class definition corresponding to the network slice "Slice A". During time period t3, if an access attempt corresponding to network slice "slice A" is initiated, the UE NAS 13 may determine the access class of the access attempt according to the stored access class definition. In other words, the access class of the access attempt may be updated by the UE NAS 13 according to the stored access class definition. For example, UE NAS 13 may decide the access class of the access attempt as access class "AC 32" according to the stored access class definition with priority value "P=5". Therefore, the UE AS 15 may perform an access barring check on the network slice "slice A" according to the access class "AC 32".

5 shows a schematic diagram of determining an access category for an access attempt according to another embodiment of the present disclosure. Assume that UENAS 13 pre-stores the stored access class definitions associated with network slice "Slice A" and network slice "Slice B".

During the time period t1, since the local access class definition corresponding to the network slice "Slice C" or the stored access class definition corresponding to the network slice "Slice C" is not stored in the UE NAS 13, if the corresponding For an access attempt in the network slice "slice C", the UE NAS 13 can determine the access class of the access attempt according to the default access class definition. For example, the UE NAS 13 may decide the access class of the access attempt as access class "AC 7" according to the default access class definition. Therefore, during the time period t1, the UE AS 15 may perform an access barring check on the network slice "Slice C" according to the barring control information of the access class "AC 7".

Assume that network slice congestion occurs on network slice "Slice C" after time period t1. The core network 11 may transmit broadcast system information to the UE AS 15 in order to inform the UE that the network slice "slice C" is congested. The UE AS 15 may obtain the broadcast system information, and the UE NAS 13 may obtain the local access class definition corresponding to the network slice "Slice C" from the broadcast system information. Rather, UE AS 15 may deliver local access class definitions to UENAS 13 in response to receiving broadcast system information. During time period t2, since at least one local access class definition corresponding to network slice "slice C" is stored in UE NAS 13, if an access attempt corresponding to network slice "slice C" is initiated, then UE NAS 13 The access class of the access attempt may be determined according to the local access class definition. In other words, the access class of the access attempt may be updated by the UENAS 13 according to the local access class definition. For example, the UE NAS 13 may decide the access class of the access attempt as access class "AC 34" according to the local access class definition with priority value "P=4". Therefore, the UE AS 15 may perform an access barring check on the network slice "slice C" according to the access class "AC 34".

Assume that network slice congestion occurs on network slice "Slice C" after time period t2. The core network 11 may transmit the broadcast system information to the UE AS 15 in order to inform the UE that the network slice "Slice C" is no longer congested, wherein the broadcast system information may not contain a local access class definition corresponding to the network slice "Slice C" . The UE AS 15 may acquire broadcast system information. Since the local access class definition corresponding to the network slice "slice C" or the stored access class definition corresponding to the network slice "slice C" is not stored in the UE NAS 13, if the access attempt of the network slice "slice C", then the UE NAS 13 can determine the access class of the access attempt according to the default access class definition. In other words, the access class of the access attempt may be updated by the UE NAS 13 according to the default access class definition. For example, the UE NAS 13 may decide the access class of the access attempt as access class "AC 7" according to the default access class definition. Therefore, during the time period t3, the UE AS 15 may perform an access barring check on the network slice "Slice C" according to the barring control information of the access class "AC 7".

FIG. 6 shows a schematic diagram of determining an access category for an access attempt according to another embodiment of the present disclosure. Assume that cell 1 (or the first base station) transmits broadcast system information during time period t2 and time period t3. If the UE is served by cell 1 during time period t2, the UE performs a handover to cell 2 (or the second base station) after time period t2. Therefore, UE AS 15 may obtain broadcast system information from cell 1 during time period t2, and obtain broadcast system information from cell 2 after performing handover to cell 2 (eg, during time period t3). UE AS 15 may not receive any of the local access class definitions during time period t3 because cell 2 may transmit broadcast system information that does not involve local access class definitions during time period t3.

Specifically, assume that UE NAS 13 pre-stores the stored access class definitions associated with network slice "Slice A" and network slice "Slice B", and assume that the UE is served by cell 1 during time period t1. Because cell 1 may not transmit broadcast system information during time period t1, UE AS 15 may not receive broadcast system information during time period t1. Therefore, the local access class definition will not be delivered to the UE NAS 13.

If network slice congestion occurs on network slice "Slice C" after time period tl, core network 11 may transmit broadcast system information to UE AS 15 in order to inform UE that network slice "Slice C" is congested. The UE AS 15 may obtain the broadcast system information from cell 1 and the UE NAS 13 may obtain the local access class definition corresponding to the network slice "Slice C" from the broadcast system information. The UE NAS 13 may store the local access class definition corresponding to the network slice "Slice C".

If the UE performs a handover procedure for cell 2 after time period t2, the UE AS 15 may no longer obtain broadcast system information from cell 1 during time period t3. UE AS 15 may obtain broadcast system information from cell 2 during time period t3. However, since cell 2 may transmit broadcast system information during time period t3 that does not involve local access class definitions, in this embodiment, UE AS 15 may not obtain any local access class definitions during time period t3. Therefore, no local class definitions will be delivered to the UE NAS 13.

It is assumed that at least one local access class definition corresponding to a network slice is stored in the UE NAS 13 . If the UEAS 15 receives new broadcast system information, the UE NAS 13 may update the local access class definition according to the new broadcast system information. Specifically, if the new broadcast system information contains at least one new local access class definition corresponding to the network slice, the UE NAS 13 may replace the original local access class definition stored in the UE NAS 13 with the new local access class definition Access class definition. Therefore, the UE NAS 13 may update the access class of the access attempt (ie, the access attempt corresponding to the network slice) according to the new local access class definition. In one embodiment, if no local access class definition corresponding to the network slice is included in the new broadcast system information, the UE AS 15 may inform the UE NAS 13 that there is no local access class definition in the new broadcast system information. Therefore, the UE NAS 13 may discard the local access class definition corresponding to the network slice in the UE NAS 13 . Accordingly, the UE NAS 13 may update the access class of the access attempt (ie, the access attempt corresponding to the network slice) according to the stored access class definition in the UE NAS 13 or according to the default access class definition. Additionally, the UE AS 15 may notify the UE's upper layers (eg, the UE NAS 13) to discard the local access class definitions stored in the upper layers.

Figure 7 shows a schematic diagram of UE AS 15 behavior for updating local access class definitions according to an embodiment of the present disclosure. The UE NAS 13 may obtain at least one local access class definition from the UE AS 15 . In one embodiment, UE AS 15 may store local access class definitions and receive broadcast system information from gNB 14, where broadcast system information may be carried, for example, by updated system information blocks. After receiving the broadcast system information carrying at least one new local access class definition, the UE AS 15 may replace the local access class definition stored in the UE AS 15 with the new local access class definition. After this, the UE AS 15 may deliver the new local access class definition to the UE NAS 13 . If no local access class definitions are included in the broadcast system information, the UE AS 15 may inform the UE's upper layers (eg, UE NAS 13) to discard all local access class definitions stored in the upper layers.

For example, UE AS 15 may store local access class definitions 71 corresponding to network slice "Slice A", network slice "Slice B", and network slice "Slice C". UE AS 15 may receive an updated system information block carrying local access class definitions 72, which may correspond to network slice "slice A", network slice "slice B", and network slice "slice C" . After receiving the updated system information block, UE AS 15 may replace local access class definition 71 with local access class definition 72 and UE AS 15 may deliver local access class definition 72 to UE NAS 13 .

For another example, UE AS 15 may store local access class definitions 71 corresponding to network slice "Slice A", network slice "Slice B", and network slice "Slice C". The UE AS 15 may receive an updated system information block carrying a local access class definition 73, which may correspond to network slice "slice A" and network slice "slice C" in the local access class definition 73 . After receiving the updated system information block, the UE AS 15 may replace the local access class definition 71 with the local access class definition 73 and the UE AS 15 may deliver the local access class definition 73 to the UE NAS 13 .

For other examples, UE AS 15 may store local access class definitions 71 corresponding to network slice "Slice A", network slice "Slice B", and network slice "Slice C". The UE AS 15 may receive an updated system information block that does not carry the local access class definition. After receiving the updated system information block, UE AS 15 may discard local access class definitions 71, and UE AS 15 may notify upper layers of the UE (eg, UE NAS 13) to discard all local access class definitions stored in upper layers.

8 illustrates a schematic diagram of UE AS behavior for updating local access class definitions according to another embodiment of the present disclosure. The UE NAS 13 may obtain at least one local access class definition from the UE AS 15 . In one embodiment, UE AS 15 may not store local access class definitions. UE AS 15 may receive broadcast system information from gNB 14, where broadcast system information may be carried, for example, by updated system information blocks. After receiving the broadcast system information carrying at least one new local access class definition, the UE AS 15 may deliver the new local access class definition directly to the UE NAS 13 . If the local access class definitions are not included in the broadcast system information, the UE AS 15 may inform the UE's upper layers (eg, UE NAS 13) to discard all local access class definitions stored in the upper layers.

For example, UE AS 15 may not store any of the local access class definitions. UE AS 15 may receive an updated system information block carrying local access class definitions 82, which may correspond to network slice "slice A", network slice "slice B", and network slice "slice C" . After receiving the updated system information block, the UE AS 15 may deliver the local access class definition 82 directly to the UE NAS 13 .

For another example, UE AS 15 may not store any of the local access class definitions. The UE AS 15 may receive an updated system information block carrying a local access class definition 83, which may correspond to network slice "slice A" and network slice "slice C" in the local access class definition 83 . After receiving the updated system information block, the UE AS 15 may deliver the local access class definition 83 directly to the UE NAS 13 .

For other examples, UE AS 15 may not store any of the local access class definitions. The UE AS 15 may receive an updated system information block that does not carry the local access class definition. After receiving the updated system information block, the UE AS 15 may notify the UE's upper layers (eg, UE NAS 13) to discard all local access class definitions stored in the upper layers.

9 illustrates a signaling diagram for obtaining barring control information associated with an additional access class definition according to an embodiment of the present disclosure. In step S91, a static mapping relationship between at least one additional access class definition and at least one network slice may be pre-configured for the core network 11 and the UE NAS 13.

In one embodiment, the UE may pre-store at least one legacy access class definition corresponding to at least one network slice, and the UE may pre-store at least one additional access class definition corresponding to at least one network slice, wherein the legacy access class Definitions or additional access class definitions may be configured by unicast NAS signaling.

Specifically, the core network 11 may transmit NAS signaling to the UE NAS 13, wherein the NAS signaling may include access class definition information to the UE NAS 13, wherein the access class definition information may include at least one network slice corresponding to at least one network slice. An additional access class definition. After receiving the NAS signaling, the UE NAS 13 may acquire access class definition information from the NAS signaling. The UE NAS 13 may obtain the additional access class definitions from the access class definition information, and store the additional access class definitions.

In one embodiment, the UE NAS 14 may obtain and store at least one legacy access class definition corresponding to at least one network slice prior to or in step S91. For example, the access class definition information may further include at least one legacy access class definition corresponding to at least one network slice. The legacy access class definition may be an access class definition defined by 3GPP specification TS 24.501. The additional access class definitions may be access class definitions defined by 3GPP specification TS 24.501. The legacy access class definition or the additional access class definition may be one of the operator defined access class definitions.

In step S92, when network slice congestion occurs, the core network 11 may transmit a message such as an "overload start" message to the gNB 14 to indicate the congested network slice, wherein the message may contain additional accesses corresponding to the congested network slice Classes define data about prohibited control information. The gNB 14 may include several associated cells to the core network 11 . That is, the core network 11 wants to prevent the relevant cells belonging to the gNB 14 from initiating access attempts corresponding to congested network slices.

The barring control information may include at least one mapping relationship between an access class and a barring control parameter, where the barring control parameter may include a barring factor (eg, uac-BarringFactor), a barring time (eg, uac-BarringTime) or an access identifier (eg, uac-BarringForAccessIdentity). In one embodiment, NAS signaling and barring control information may map the same access class to different network slices. For example, the barring control information may include both the mapping relationship between network slice "slice A" and access class "AC32" and the mapping relationship between network slice "slice B" and access class "AC32". Table 6 is an example of the content of the barring control information defined by the additional access class.

Table 6

After receiving the "overload start", in step S93, the gNB 14 may transmit the broadcast system information associated with the change of the system information (ie, the change notification) to the UE via a paging message or DCI. The broadcast system information may contain barring control information defined for additional access classes corresponding to the congested network slice. The UE may be a related UE. That is, the UE may initiate an access attempt to a congested network slice. UE AS 15 may acquire broadcast system information sent from gNB 14. In one embodiment, the broadcast system information may be carried by AS signaling such as a system information block (eg, SIB1 or SIBx as specified in the NR specification). Table 7 is an example of SIB1 defined by 3GPP specification TS 38.331.

Table 7

In step S94, the UE AS 15 may perform a system information acquisition procedure with the gNB 14 according to the broadcast system information. In the system information acquisition procedure, additional access class-defined barring control information may be provided to the UE AS 15. When an access attempt is initiated, the UE may determine the access class of the access attempt according to the stored access class definition or additional access class definitions. Specifically, the UE NAS 13 may initiate an access attempt corresponding to a network slice. The US NAS 13 may initiate an access attempt after receiving signaling from the UE's application layer.

10 illustrates a signaling diagram of a procedure for slice-based access barring according to an embodiment of the present disclosure. Suppose an access attempt corresponding to a congested network slice is initiated. After the UE NAS 13 initiates the access attempt, the UE NAS 13 may deliver the access attempt to the UE AS 15 in step S101 . In one embodiment, UE NAS 13 may assign legacy access classes (ie, access classes defined by legacy access class definitions) or additional access classes (ie, access classes defined by additional access class definitions) category) is delivered to the UE AS 15 with the access attempt, where either the legacy access category or the additional access category is associated with the network slice.

In step S102, the UE AS 15 may decide which inhibition control information is to be applied. In one embodiment, if the UE AS 15 has received the barring control information defined by the additional access class (eg, in step S94), the UE AS 15 may decide to refrain from the access attempt according to the barring control information of the additional access class Perform access barring checks. If the UE AS 15 has not received the barring control information defined by the additional access class, the UE AS 15 may decide to perform an access barring check on the access attempt according to the barring control information of the legacy access class.

It is assumed that the UE AS 15 has obtained the barring control information, and the UE is assumed to store the legacy access class definition corresponding to the congested network slice, and to store the additional access class definition corresponding to the congested network slice. In one embodiment, the UE AS 15 may determine which barring control information to apply if the legacy access class definition corresponding to the congested network slice does not match the default access class definition. If the legacy access class definition corresponding to the congested network slice matches the default access class definition, the UE AS 15 may decide to perform an access barring check on the access attempt according to the barring control information of the legacy access class. For emergency situations, the default access class definition may correspond to an access class, such as "Access Class 0" or "Access Class 2" as defined in 3GPP specification TS24.501.

After determining the barring control information applied to the access attempt, in step S103, the UE AS 15 may perform an access barring check on the network slice according to the access class. If the barring control information applied to the access attempt is determined based on the legacy access class, the UE AS 15 may perform an access barring check according to the barring control information of the legacy access class. If the barring control information applied to the access attempt is determined based on the additional access class definition, the UE AS 15 may perform an access barring check according to the barring control information of the additional access class. For example, the prohibition control information may include the prohibition time. The UE AS 15 may perform the access barring check according to the timer T390 corresponding to the barring time.

If the result of the access barring check shows that the access attempt to the network slice is allowed, the UE AS 15 may perform the access attempt by accessing the gNB 14 in step S104. In step S105, after being accessed by the UE, the gNB 14 may send an access attempt response corresponding to the access attempt to the UE AS 15.

11 shows a flowchart of a method for determining which inhibition control information to apply, wherein the method may be implemented by a UE, according to an embodiment of the present disclosure. It is assumed that the UE stores at least one legacy access class definition corresponding to the network slice, and stores at least one additional access class definition corresponding to the network slice.

If an access attempt corresponding to a network slice is initiated, in step S111, the UE may check whether the access attempt is mapped to a legacy access class corresponding to "Access Class 0", which is associated with the default access class associated with the input category definition. If the legacy access class corresponds to "access class 0", proceed to step S112. If the legacy access class definition does not correspond to "access class 0", proceed to step S113.

In step S112, the UE may perform the conventional behavior corresponding to "Access Category 0". "Access Class 0" means that access attempts to the network slice are always passed.

In step S113, the UE may check whether the access attempt is mapped to a legacy access category corresponding to "Access Category 2", which is associated with the default access category definition. If the legacy access category corresponds to "Access Category 2", proceed to step S114. If the legacy access category does not correspond to "Access Category 2", proceed to step S115. It should be noted that since the priority of "Access Category 0" is higher than that of "Access Category 2", the UE first checks whether the access attempt belongs to "Access Category 0", and then the UE checks whether the access attempt belongs to "Access Category 0". Access Category 2".

In step S114, the barring control information corresponding to the legacy access category of "Access Category 2" is applied by the UE. The UE may perform an access barring check based on barring control information of "Access Category 2".

In step S115, the UE may determine whether there is barring control information for additional access classes (ie, stored by the UE). If there is barring control information for additional access classes, proceed to step S116. If there is no barring control information for the additional access class, proceed to step S117.

In step S116, the barring control information defined by the additional access class is applied by the UE. The UE may perform an access barring check based on barring control information for additional access classes.

In step S117, the barring control information of the legacy access class is applied by the UE. The UE may perform the access barring check based on the barring control information of the legacy access class (eg, barring control information corresponding to the default access class definition).

12 shows a schematic diagram of access categories for access attempts according to an embodiment of the present disclosure. US NAS 13 may store legacy access class definitions for access class "AC 7" and may store additional access class definitions for access class "AC1000". US NAS 13 may deliver legacy access category "AC 7" to UE AS 15 and may deliver additional access category "AC 1000" to UE AS 15. US AS 15 may store legacy access class "AC 7" and may store additional access class "AC 1000", where access class "AC 7" and access class "AC 1000" correspond to network slice "slice A" associated with the access attempt. It is assumed that the UE does not receive barring control information for the access class "AC 1000" before the end of the time period t1. That is, there is no barring control information for additional access classes during the time period t1. Assuming that an access attempt corresponding to network slice "slice A" is initiated during time period t1, the UE AS 15 may apply the barring control information for access class "AC7" since there is no barring control information defined by additional access classes for access attempts.

If, after time period t1, network slice congestion occurs on network slice "Slice A", gNB 14 may transmit barring control information for access class "AC 1000" to the UE via broadcast system information, which may be used by the AS signaling carry. During period t2, if there is barring control information for the additional access class, the UE AS 15 may apply barring control information for the additional access class to the access attempt. Therefore, the UE AS 15 may apply the barring control information of the access class "AC 1000" to the access attempt.

13 illustrates a schematic diagram of access categories for access attempts according to another embodiment of the present disclosure. US NAS 13 may store legacy access class definitions for access class "AC 2" and may store additional access class definitions for access class "AC 1000". US NAS 13 may deliver legacy access category "AC 2" to UE AS 15 and may deliver additional access category "AC1000" to UE AS 15. The US AS 15 may store the legacy access class "AC 2" and may store the additional access class "AC1000", where the access class "AC 2" and the access class "AC 1000" are associated with the connection corresponding to the network slice "slice A" access attempts, and for emergency situations, access class "AC 2" is associated with the default access class definition. It is assumed that the UE does not receive barring control information for the access class "AC 1000" before the end of the time period t1. That is, there is no barring control information for additional access classes during the time period t1. Assuming that an access attempt corresponding to network slice "slice A" is initiated during time period t1, since there is no barring control information for additional access classes, UE AS 15 may apply barring control information for access class "AC 2" for access attempts.

If, after time period t1, network slice congestion occurs on network slice "Slice A", gNB 14 may transmit barring control information for access class "AC 1000" to the UE via broadcast system information, which may be used by the AS signaling carry. During time period t2, in response to access class "AC 2" matching the default access class definition, the UE AS 15 may bar the access class "AC 2" even if there is barring control information for additional access class definitions Control information is applied to access attempts.

14 shows a flowchart of a method for slice-based access barring, wherein the method is applicable to a UE including an access stratum and a non-access stratum, according to an embodiment of the present disclosure. In step S141, the unicast non-access stratum signaling is obtained through the non-access stratum, wherein the unicast non-access stratum signaling includes an access class definition corresponding to the network slice. In step S142, broadcast system information is acquired through the access layer, wherein the broadcast system information includes a local access class definition corresponding to the network slice. In step S143, the local access class definition is delivered to the non-access stratum through the access stratum. In step S144, an access attempt is initiated through the non-access stratum. In step S145, the non-access layer determines the access class of the access attempt according to the access class definition and the local access class definition. In step S146, an access barring check is performed on the access attempt according to the access class by the access layer.

15 shows a flowchart of a method for slice-based access barring, wherein the method is applicable to a UE including an access stratum and a non-access stratum, according to another embodiment of the present disclosure. In step S151, the unicast non-access stratum signaling is acquired through the non-access stratum, wherein the unicast non-access stratum signaling includes an access class definition corresponding to the network slice. In step S152, an access attempt is initiated through the non-access stratum. In step S153, the access class of the access attempt is determined by the non-access stratum according to the access class definition and the additional access class of the access attempt. In step S154, an access barring check is performed by the access layer on the access attempt according to the access class.

16 shows a schematic diagram of a UE 100 according to an embodiment of the present disclosure. UE 100 may include processor 110 , storage medium 120 , and transceiver 130 . The processor 110 is coupled to the storage medium 120 and the transceiver 130, and is configured to implement at least the methods described in FIGS. 1-16, as well as exemplary embodiments and alternative variations thereof.

The processor 110 may be implemented using programmable units such as microprocessors, microcontrollers, DSP chips, FPGAs, and the like. The functions of processor 110 may also be implemented with a separate electronic device or IC. It should be noted that the functions of processor 110 may be implemented in hardware or software.

The storage medium 120 may be, for example, any type of fixed or removable random access memory (RAM), read-only memory (ROM), flash memory, hard disk drive (HDD), solid state A solid state drive (SSD) or similar element, or a combination thereof, configured to record multiple modules or various applications executable by the processor 110 . In one embodiment, the storage medium 120 may store the access stratum 121 and the non-access stratum 122, wherein the UE AS 15 and UE NAS 13 mentioned above may be implemented by the access stratum 121 and the non-access stratum 122, respectively .

Transceiver 130 may be configured to transmit and receive signals at radio frequencies or millimeter wave frequencies, respectively. Transceiver 130 may also perform operations such as low noise amplification, impedance matching, frequency mixing, up- or down-conversion, filtering, amplification, and the like. Transceiver 130 may include one or more digital/analog (digital/analog) signals configured to convert from an analog signal format to a digital signal format during uplink signal processing and from a digital signal format to an analog signal format during downlink signal processing. -to-analog; D/A) converter or analog-to-digital (analog-to-digital; D/A) converter. Transceiver 130 may include an antenna array, which may include one or more antennas that transmit and receive omnidirectional antenna beams or directional antenna beams.

Based on the above, the present disclosure may provide the stored access class definitions to the UE, such that the UE may pre-store the stored access class definitions, and the present disclosure may dynamically provide the UE with local access class definitions. In the event of network slice congestion, the UE may determine the access attempt of an access attempt based on the local access class definition instead of the stored access class definition only when the UE receives broadcast system information corresponding to the local access class definition. into the category. Otherwise, the UE may decide the access class for the access attempt according to the stored access class definition, and the network may not have to send any signaling to the UE. On the other hand, the present disclosure may provide additional access class definitions to the UE. When network slice congestion occurs, the UE can determine the access class of an access attempt based on the additional access class definition instead of the legacy access class definition only when the UE receives barring control information corresponding to the additional access class definition . Otherwise, the UE may decide the access class of the access attempt according to the legacy access class definition. Therefore, the network can order the UE to stop accessing the congested network slice at any time, even if the amount of signaling between the network and the UE is minimized.

It will be apparent to those skilled in the art that various modifications and variations of the disclosed embodiments can be made without departing from the scope or spirit of the present disclosure. In view of the foregoing, it is intended that this disclosure cover modifications and variations provided that they come within the scope of the appended claims and their equivalents.

Claims (11)

1. A method for slice-based access barring, the method is applicable to user equipment including an access stratum and a non-access stratum, wherein the method comprises: Obtaining unicast non-access stratum signaling through the non-access stratum, wherein the unicast non-access stratum signaling includes an access class definition corresponding to a network slice; obtain broadcast system information through the access layer, wherein the broadcast system information includes a local access class definition corresponding to the network slice; delivering the local access class definition to the non-access stratum through the access stratum; Initiating an access attempt through the non-access stratum; determining, by the non-access stratum, an access class for the access attempt based on the access class definition and the local access class definition; and An access barring check is performed by the access layer on the access attempt according to the access class. 2. The method for slice-based access barring according to claim 1, further comprising: After acquiring the broadcast system information, obtain second broadcast system information through the access layer, wherein the second broadcast system information includes a second local access class definition; delivering the second local access class definition to the non-access stratum through the access stratum; and The local access class definition is updated to the second local access class definition by the non-access stratum. 3. The method for slice-based access barring according to claim 1, further comprising: After acquiring the broadcast system information, acquire second broadcast system information through the access layer, wherein the second broadcast system information does not include a local access class definition; notifying the non-access stratum, through the access stratum, that there is no local access class definition in the second broadcast system information; and The local access class definition is discarded by the non-access stratum in response to no local access class definition in the second broadcast system information. 4. The method for slice-based access barring of claim 2, wherein the access stratum acquires the broadcast system information from a first base station, and the access stratum is executing the The second broadcast system information is acquired from the second base station after the handover from the base station to the second base station. 5. The method for slice-based access barring according to claim 1, wherein the broadcast system information further comprises barring control information corresponding to the local access class definition, wherein the access stratum The access barring check is performed using the barring control information. 6. The method for slice-based access barring of claim 1, wherein the local access class definition is associated with an operator-defined access class. 7. A method for slice-based access barring, the method is applicable to user equipment including an access stratum and a non-access stratum, wherein the method comprises: Obtaining unicast non-access stratum signaling through the non-access stratum, wherein the unicast non-access stratum signaling includes an access class definition corresponding to a network slice; Initiating an access attempt through the non-access stratum; determining, by the non-access stratum, an access class for the access attempt based on the access class definition and additional access classes for the access attempt; and An access barring check is performed by the access layer on the access attempt according to the access class. 8. The method for slice-based access barring according to claim 7, further comprising: obtain broadcast system information by the access stratum, wherein the broadcast system information includes barring control information corresponding to a second additional access category; if the additional access class of the access attempt is equal to the second additional access class, performing the access barring check according to the barring control information; and if the additional access class of the access attempt is not equal to the second additional access class, performing the access according to second barring control information corresponding to the access class of the access attempt Entry prohibition inspection. 9. The method for slice-based access barring of claim 7, wherein the unicast non-access stratum signaling includes a mapping relationship between the additional access class and the network slice. 10. A user equipment for slice-based access barring, comprising: transceiver; storage media, including access stratum and non-access stratum; and a processor coupled to the storage medium and the transceiver, wherein the processor is configured to: obtaining, by the non-access stratum, unicast non-access stratum signaling via the transceiver, wherein the unicast non-access stratum signaling includes an access class definition corresponding to a network slice; obtaining broadcast system information via the transceiver by the access layer, wherein the broadcast system information includes a local access class definition corresponding to the network slice; delivering the local access class definition to the non-access stratum through the access stratum; Initiating an access attempt through the non-access stratum; determining, by the non-access stratum, an access class for the access attempt based on the access class definition and the local access class definition; and An access barring check is performed on the access attempt by the access layer via the transceiver according to the access class. 11. A user equipment for slice-based access barring, comprising: transceiver; storage media, including access stratum and non-access stratum; and a processor coupled to the storage medium and the transceiver, wherein the processor is configured to: obtaining, by the non-access stratum, unicast non-access stratum signaling via the transceiver, wherein the unicast non-access stratum signaling includes an access class definition corresponding to a network slice; Initiating an access attempt through the non-access stratum; determining, by the non-access stratum, an access class for the access attempt based on the access class definition and additional access classes for the access attempt; and An access barring check is performed by the access layer on the access attempt according to the access class.

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