Session control device, access control device, signaling control method performed by device, and terminal device

Abstract

The present invention proposes a scheme that implements a specific technique that enables a service request process of a UE to be efficient by reducing signaling occurring during the service request process, the overall network performance is thus made more efficient in various aspects such as reducing the computing resource consumption of the service request process and shortening the latency of the UE connecting to the data network.

Description

Technical Field

[0001] The present disclosure relates to a technique for making a service request process of a user equipment (UE) more efficient.

[0002] This application claims priority to Korean Patent Application No. 10-2022-0078933, filed on June 28, 2022, the disclosure of which is incorporated herein by reference in its entirety. Background Art

[0003] In 5G, a network structure for supporting UE, Base Station (BS) (access), core, and server in an end-to-end manner is defined.

[0004] In 5G, the control signaling function and the data transceiver function are separated, and a network structure in which the control signaling function area (control plane) and the data transceiver function area (user plane) are separated is defined.

[0005] At this time, in 5G, the nodes of the control plane (CP) can be defined by the following functions: an access and mobility management function (AMF) for controlling the radio part access of the UE, a policy control function (PCF) for managing / controlling policies such as UE information and subscription service information and charging each UE, a session management function (SMF) for controlling / managing sessions for using data services for each UE, a network exposure function (NEF) for performing a function of sharing information with an external network, a unified data management / authentication function (UDM / AUSF) for managing / controlling a subscriber DB and user authentication, a network repository function (NRF) for managing / controlling information about a network function (NF) inside the network, and a charging function (CHF) for processing charges for subscribers.

[0006] In addition, in 5G, a node of the user plane (UP) can be defined as a user plane function (UPF) for sending and receiving data between a UE and a server on an external service network (such as the Internet) through a session with the UE based on control of the SMF (interacting with the SMF).

[0007] In such 5G, the control nodes of the control plane and the data nodes of the user plane may be collectively referred to as network devices (network functions (NFs)).

[0008] At the same time, the UE interacts with the 5G core to access data networks (such as the Internet).

[0009] To describe it, when the data network initially requires service transmission, the UE performs a packet data unit (PDU) session generation procedure.

[0010] Thereafter, when there is no UE traffic transmission and reception within a predetermined time (e.g., about 10 seconds), the RAN releases the control plane / user plane between the UE and the 5G core through the AN release process to make radio resources efficient. In this case, the UE's PDU session becomes UP deactivated through the AN release process.

[0011] Thereafter, when service transmission to the UE is required again, a control plane / user plane path between the UE and the 5G core is generated through a service request process, in which the UE's PDU session becomes an UP activation state through the service request process.

[0012] In the statistics of actual commercial networks, AN release and service request are very frequent and repeated, which means that the service request process occupies a large part of the entire network. If the service request process can be made more efficient, the performance of the entire network can be made more efficient.

[0013] In view of this, the present disclosure proposes a new technical solution that can make the service request process of the UE more efficient. Summary of the invention

[0014] Technical issues

[0015] The technical solution of the present disclosure is used to implement a new technical method, which can make the service request process more efficient by reducing the signaling occurring during the service request process of the UE.

[0016] Technical Solution

[0017] According to an embodiment of the present disclosure, an apparatus for controlling a session includes: an identification unit configured to identify a user equipment (UE) for activating a path of a user plane (UP); and an information transmission unit configured to transmit specific information related to information storage to an access control apparatus during an UP path activation process of the UE, so as to allow the access control apparatus to omit some signaling by using the specific information during the UP path activation process of the UE.

[0018] Specifically, the specific information may be sent using a specific message for sending an N2PDU session resource establishment request transmission IE including uplink tunnel information of the UE's UP to the access control device.

[0019] Specifically, the specific information may include: identification information, which marks a first identifier or a second identifier, the first identifier is used to store the information constituting the specific information and the N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UP as a specific context, and the second identifier is used to delete the specific context pre-stored by the previous specific information; and the first information or the second information in the case where the first identifier is marked in the identification information, the first information indicates the tracking area identifier (TAI) in units of a predetermined range that the UP can support, and the second information indicates whether the UP supports all TAIs.

[0020] Specifically, in the case where the UP path activation process is a UE-triggered service request process, the specific message may be an Nsmf_PDUSession_UpdateSMContext response message, and in the case where the UP path activation process is a NW-triggered service request process or a PDU session establishment process, the specific message may be a Namf_Communication_N1N2MessageTransfer request message.

[0021] Specifically, the information transmission unit may be configured to determine whether to send the specific information based on a possibility related to information storage received in advance from the access control device.

[0022] Specifically, some signaling may be a request message sent by the access control device to the device controlling the session and a response message received from the device to obtain the N2PDU session resource establishment request transmission IE including the uplink tunnel information of the UE's UP.

[0023] Specifically, the information transmission unit can be configured to, when identifying a change in the N2 PDU session resource setting request transmission IE including the uplink tunnel information of the UP during a UE / RAN triggered PDU session modification procedure or a NW triggered PDU session modification procedure of the UE, transmit specific information using the identification information as the second identifier to the access control device, so as to allow the access control device to delete the specific context pre-stored by previous specific information according to the specific information, and perform the remaining procedures.

[0024] According to an embodiment of the present disclosure, an apparatus for controlling access includes: a context identification unit configured to identify whether there is a pre-stored specific context for a user equipment (UE) for activating a path for a user plane (UP); and a controller configured to perform a UP path activation process for the UE by using the specific context when the specific context exists without requiring some signaling with a session control device.

[0025] Specifically, the specific context can be stored by specific information transmitted from the session control device during the UP path activation process previously performed for the UE, and can be defined by first information indicating a tracking area identifier (TAI) in units of a predetermined range supportable by the UP or second information indicating whether the UP supports all TAIs, and an N2 PDU session resource establishment request transmission IE including uplink tunnel information of the UE's UP.

[0026] Specifically, during the UP path activation process of the UE, the controller can be configured to perform the remaining process by reusing the N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UP within the specific context, when determining that the location of the UE belongs to the TAI based on the first information or the second information within the specific context, without the need for obtaining some of the signaling of the N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UP of the UE.

[0027] Specifically, the controller may be configured to, when determining that the location of the UE does not belong to the TAI according to the first information in the specific context during the mobility-related process of the UE, delete the specific context and perform the remaining processes.

[0028] According to an embodiment of the present disclosure, a user equipment (UE) device includes: a request unit configured to send a request for activating a path of a user plane (UP); and a controller configured to activate the path of the UP by controlling an access control device that receives the request, wherein the request includes a location of the UE device, and the access control device is configured to perform a UP path activation process based on the location of the UE device identified in the request by reusing a specific context pre-stored during a UP path activation process previously performed for the UE device, without requiring some signaling in the UP path activation process.

[0029] According to an embodiment of the present disclosure, a method for control signaling performed by a session control device includes: an identification step, which identifies a user equipment (UE) for activating a path of a user plane (UP); and an information transmission step, which sends specific information related to information storage to an access control device during an UP path activation process of the UE, so as to omit some signaling by using the specific information in a subsequent UP path activation process of the UE.

[0030] Specifically, a specific message can be used to send the specific information, and the specific message is used to send an N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UE's UP to the access control device, and the specific information may include: identification information, which marks a first identifier or a second identifier, the first identifier stores information constituting the specific information and the N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UE's UP as a specific context, the second identifier deletes the specific context pre-stored by the previous specific information; and the first information or the second information in the case where the first identifier is marked in the identification information, the first information indicates a tracking area identifier (TAI) in units of a predetermined range that the UP can support, and the second information indicates whether the UP supports all TAIs.

[0031] Specifically, the specific information can be transmitted to the access control device by using a specific message for sending an N2PDU session resource setting request transmission IE including the uplink tunnel information of the UE's UP, and in the case where the UP path activation process of the UE is a UE-triggered service request process, the specific message can be an Nsmf_PDUSession_UpdateSMContext response message, and in the case where the UP path activation process is a NW-triggered service request process or a PDU session establishment process, the specific message can be a Namf_Communication_N1N2MessageTransfer request message.

[0032] According to an embodiment of the present disclosure, a method for control signaling performed by an access control device includes: a context identification step, which identifies whether there is a pre-stored specific context for a user equipment (UE) for activating a path for a user plane (UP); and a control step, which, in the presence of the specific context, performs a UP path activation process for the UE by using the specific context without requiring some signaling with a session control device.

[0033] Technical Effects

[0034] According to an embodiment of the present disclosure, a detailed technical configuration capable of making the service request process efficient is achieved by reducing signaling occurring during the service request process of a UE.

[0035] Therefore, the present disclosure achieves the effect of making the overall network performance more efficient in various aspects such as reducing computer resource consumption of the service request process and reducing the delay of the connection between the UE and the data network. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The life cycle of a PDU session is shown separated for each state.

[0037] Figure 2 and Figure 3 The calling flow of executing the existing service request process is shown.

[0038] Figure 4 is a block diagram showing the configuration of a session control device, an access control device, and a UE device according to an embodiment of the present disclosure.

[0039] Figure 5 and Figure 6 is a flowchart illustrating a service request process performed by a signaling control method according to an embodiment of the present disclosure.

[0040] Figure 7 and Figure 8 is a flow chart showing an implementation of deleting a service request (SR) context through a signaling control method according to the present disclosure. DETAILED DESCRIPTION

[0041] Hereinafter, various embodiments of the present disclosure are described with reference to the accompanying drawings.

[0042] The present disclosure relates to a technology for making a service request process of a UE more efficient.

[0043] In 5G, a network structure for supporting UE, Base Station (BS) (access), core, and server in an end-to-end manner is defined.

[0044] In 5G, the control signaling function and the data transceiver function are separated, and a network structure in which the control signaling function area (control plane) and the data transceiver function area (user plane) are separated is defined.

[0045] At this time, in 5G, the nodes of the control plane (CP) can be defined as the following functions: an access and mobility management function (AMF) for controlling the radio part access of the UE, a policy control function (PCF) for managing / controlling policies such as UE information and subscription service information and charging each UE, a session management function (SMF) for controlling / managing sessions for using data services for each UE, a network exposure function (NEF) for performing a function of sharing information with an external network, a unified data management / authentication function (UDM / AUSF) for managing / controlling a subscriber DB and user authentication, a network repository function (NRF) for managing / controlling information about a network function (NF) inside the network, and a charging function (CHF) for processing charges for subscribers.

[0046] In addition, in 5G, a node of the user plane (UP) can be defined as a user plane function (UPF) for sending and receiving data between a UE and a server on an external service network (such as the Internet) through a session with the UE based on control of the SMF (interacting with the SMF).

[0047] In such 5G, the control nodes of the control plane and the data nodes of the user plane may be collectively referred to as network devices (network functions (NFs)).

[0048] At the same time, the UE interacts with the 5G core to access data networks (such as the Internet).

[0049] To describe it, when the data network initially requires service transmission, the UE performs a packet data unit (PDU) session generation procedure.

[0050] After that, when there is no UE service transmission and reception within a predetermined time (e.g., about 10 seconds), RAN releases the control plane / user plane between the UE and the 5G core through the AN release process to make radio resources efficient. In this case, the UE's PDU session changes to the UP deactivated state through the AN release process.

[0051] Thereafter, when service transmission to the UE is required again, a control plane / user plane path between the UE and the 5G core is generated through a service request process, in which the UE's PDU session becomes an UP activation state through the service request process.

[0052] Finally, when data network access is no longer required (e.g. power off), the UE performs the PDU session deletion procedure.

[0053] Figure 1 The life cycle of a PDU session is shown separated for each state.

[0054] Reference Figure 1 , the generation and deletion of PDU sessions in the PDU session life cycle occur when there are specific events such as power on / off, and AN release and service requests are frequently and repeatedly generated.

[0055] Statistics on actual commercial networks show that the proportion of PDU session generation and deletion processes each accounts for about 0.5% of the entire process, while the proportion of AN release and service request each accounts for about 40%.

[0056] This means that the service request process takes up a large portion of the entire network, and if the service request process can be made more efficient, the overall network performance can be made more efficient.

[0057] In view of this, the present disclosure proposes a new technical solution that can make the service request process of the UE more efficient.

[0058] Before describing the technical solution proposed in the present disclosure, refer to Figure 2 and Figure 3 Briefly describe the call flow for executing the existing service request process.

[0059] In order to generate (activate) a user plane (UP) path in a state where there is no UP path between the UE and the RAN (UP deactivation), a UE-triggered service request method and a network-triggered service request method are used.

[0060] Figure 2 shows a UE-triggered service request method, Figure 3 A NW-triggered service request method is shown.

[0061] Refer to the following Figure 2 Describes the service request procedure triggered by the UE.

[0062] 1. When the UE needs to transmit uplink traffic, it sends a service request to the AMF (via the RAN). At this time, the request includes the UE location information (Tracking Area Identity (TAI)).

[0063] 2.AMF selects the UPF that supports the corresponding TAI for SMF and requests to send N2 SM information (used to receive uplink tunnel information).

[0064] 3. After the SMF selects the UPF, based on the TAI, the corresponding UPF transmits the N2 SM request including the tunnel information for receiving the uplink to the AMF.

[0065] 4.AMF sends an N2 request including the information received from SMF to RAN. Thus, a path for transmitting uplink between UE and 5G core is generated through RAN. RAN transmits an N2 response (tunnel information for receiving downlink) to AMF.

[0066] 5.AMF transmits the information received from RAN to SMF.

[0067] 6.SMF sends the tunnel information for transmitting the downlink to UPF. Thus, a path for transmitting the downlink between the UE and the 5G core is generated through UPF.

[0068] 7.SMF sends an update response to AMF.

[0069] As mentioned above, according to the existing UE-triggered service request process, AMF cannot know the UPF information that can be supported by the UE location (e.g., TAI#1). Therefore, the limitation is that AMF always sends Nsmf_PDUSession_UpdateSMContext_Request to SMF in step 2 to request the sending of UPF selection and N2 SM information.

[0070] In addition, refer to Figure 3 Describe the service request process triggered by the NW.

[0071] 1. When UPF receives downlink traffic but is in UP deactivated state, UPF sends a session report (Downlink Data Report (DLDR)) to SMF.

[0072] 2. When SMF sends a paging request to AMF, it can send an N2 SM request (for UPF to receive uplink tunnel information) and a list of TAIs supported by UPF.

[0073] 3.AMF saves the received N2 SM request and TAI list. After the paging is completed, the AMF identifies whether the UE location (e.g., TAI#1) is within the TAI list supportable by the UPF, and when the UE location is within the TAI list, the AMF sends an N2 request to the RAN by using the N2 SM request received in step 2. Thus, a path for transmitting uplink between the UE and the 5G core is generated through the RAN. The RAN transmits the N2 response (tunnel information for receiving downlink) to the AMF.

[0074] 4.AMF transmits the information received from RAN to SMF.

[0075] 5.SMF sends the tunnel information for transmitting the downlink to UPF. Thus, a path for transmitting the downlink between the UE and the 5G core is generated through UPF.

[0076] 6.SMF sends an update response to AMF.

[0077] 7.AMF deletes the TAI list and N2 SM request received in step 2.

[0078] As described above, according to the existing NW-triggered service request process, when considering that each TAI has a value from H'000001 to H'FFFFFE and the UPF can support a maximum of approximately 16.77 million TAIs, there is a limitation in that the payload required to send the TAI list in step 2 increases, resulting in performance degradation or failure to transmit.

[0079] In addition, as described above, according to the existing NW-triggered service request process, there are limitations in that the N2 SM request and TAI list received in step 2 are only valid in this process and cannot be reused, and when the TAIs supportable by the UPF are managed in a list form and TAIs are added due to the increase in base stations, SMF configuration needs to be added.

[0080] Therefore, the present disclosure aims to realize a new technical method that can improve the limitations of the existing service request process and make the service request process more efficient by reducing the detailed configuration of signaling generated during the service request process.

[0081] In the following, reference is made to Figure 4 The technical method proposed in the present disclosure (hereinafter referred to as SR process signaling reduction method) is described in detail.

[0082] Specifically, the present disclosure proposes a session control device and an access control device of an NF as a method for implementing a SR process signaling reduction method, and proposes a UE device that operates by interacting with the session control device and the access control device, and Figure 4 Each configuration of the session control device, access control device and UE device is shown.

[0083] First, refer to Figure 4 The configuration of the conversation control apparatus 200 according to the embodiment of the present disclosure is described.

[0084] The session control device 200 of the present disclosure may be a CU-CP, an SMF, or an S / PGW-C. However, for ease of description, the SMF is described as the session control device 200 below.

[0085] like Figure 4 As shown, the conversation control device 200 of the present disclosure includes an identification unit 210 and an information transmission unit 220 .

[0086] All or at least some of the configurations of the conversation control apparatus 200 may be implemented in the form of a hardware module, a software module, or a combination of a hardware module and a software module.

[0087] The software module may be understood as, for example, an instruction executed by a processor configured to control calculations within the session control device 200 , and the instruction may be in a form installed in a memory within the session control device 200 .

[0088] Therefore, the session control device 200 of the present disclosure implements the SR process signaling reduction method proposed in the present disclosure through the above configuration, and hereinafter, each configuration within the session control device 200 used to implement the above SR process signaling reduction method will be described in more detail.

[0089] The identification unit 210 performs a function of identifying the UE 10 for activating a path of a user plane (UP).

[0090] At this time, the "UE for activating the UP path" identified in conjunction with the UE-triggered service request process corresponds to the UE that issues a service request to the AMF (through the RAN) in a UP deactivated state without a UP path.

[0091] In addition, the "UE for activating the path of UP" identified in conjunction with the NW-triggered service request procedure corresponds to a UE in a UP inactive state for sending a session report (Downlink Data Report (DLDR)) from the UPF.

[0092] The information transmitting unit 220 performs the following functions: during the UP path activation process for UE 10, transmits specific information related to information storage to the access control device 100 for activating the UP path, and then during the UP path activation process for UE 10, omits some signaling by using the specific information.

[0093] The UP path activation procedure for the UE 10 is a service request procedure.

[0094] That is, the information transmission unit 220 may transmit specific information to the access control device 100 (eg, AMF) during the service request procedure of the UE 10 and then omit some signaling by using the specific information during the service request procedure of the UE 10.

[0095] The specific information is defined to be sent using a specific message for transmitting the N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UP of the UE 10 to the access control device 100 (eg, AMF).

[0096] Specifically, when the service request process of the UP at this time is a service request process triggered by the UE, the specific message may be a Nsmf_PDUSession_UpdateSMContext response message.

[0097] That is, the information transmission unit 220 can transmit specific information to the access control device 100 (e.g., AMF) in the service request process triggered by the UE according to the service request of the UE 10 by using an additional field in the PDUSession_UpdateSMContext response message for transmitting the N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UP to the access control device 100 (e.g., AMF), the additional field.

[0098] In addition, when the service request process of the UP at this time is a service request process or a PDU session establishment process triggered by the NW, the specific message may be a Namf_Communication_N1N2MessageTransfer request message.

[0099] That is, the information transmission unit 220 can transmit specific information to the access control device 100 (e.g., AMF) according to the report (downlink data report (DLDR)) from the UPF in the NW-triggered service request process of UE10 by using an additional field within the Communication_N1N2MessageTransfer request message for transmitting the N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UP to the access control device 100 (e.g., AMF).

[0100] Further, in the present disclosure, specific information related to information storage may be defined as including: identification information, the identification information indicating a first identifier or a second identifier, the first identifier being used to store information constituting the specific information and an N2 PDU session resource establishment request transmission IE including uplink tunnel information of the UP as a specific context, the second identifier being used to delete the specific context pre-stored by previous specific information; and the first information or the second information in the case where the identification information indicates the first identifier, the first information indicating a tracking area identifier (TAI) in units of a predetermined range that the UP can support, and the second information indicating whether the UP supports all TAIs.

[0101] To this end, the present disclosure may newly define "specific information" and "specific context" to be transmitted to the access control device 100 (e.g., AMF) as information to be stored (cached) by the "specific information" received by the access control device 100 (e.g., AMF).

[0102] In the following description, "specific information" is named "caching required information" and "specific context" is named "SR context".

[0103] In a detailed implementation, the present disclosure may newly define "caching required information" and "SR context", and first define "caching required information" as shown in the following [Table 1].

[0104] [Table 1]

[0105]

[0106]

[0107] According to the implementation mode defined as shown in [Table 1], the "specific information" defined in the present disclosure, i.e., "cache required information", includes identification information "n2CacheRequired", as a first identifier when "n2CacheRequired" indicates true and as a second identifier when "n2CacheRequired" indicates false, and when n2CacheRequired is true, includes "taiRangeList" as the first information and "allPLMN" as the second information.

[0108] Here, taiRangeList means that a plurality of "taiRange" indicating TAI within a predetermined range is transmitted in an array form. The detailed content of taiRange may include PLMN and TacRange.

[0109] The taiRange is defined such that the TAI is specified in units of a predetermined range using values ​​from the start to the end, and therefore, if the taiRange is specified / registered for each service area, additional work may not be required according to the addition of a new BS.

[0110] Therefore, it may be more efficient in operation / management than a method of using a TAI list that specifies each TAI one by one according to the existing 3GPP standard (used in the existing NW-triggered service request procedure).

[0111] In addition, allPLMN indicates that UPF supports all TAIs.

[0112] According to the definition in [Table 1], the "specific content" defined in the present disclosure, i.e., "SR context", refers to the "N2 SM information (PDU session resource establishment request transmission = N2 SM request)" and "taiRangeList (or allPLMN)" stored (cached) in the cache required information by the access control device 100 (e.g., AMF) described below in response to receiving n2CacheRequired = true.

[0113] When the access control device 100 (e.g., AMF) stores (caches) the taiRangeList as an SR context, and in the following service request process of the UE 10, the location of the corresponding UE 10 (e.g., TAI#1) is within the stored (cached) taiRangeList, some signaling can be omitted during the service request process.

[0114] Alternatively, when the access control device 100 (e.g., AMF) stores (caches) allPLMN as the SR context, some signaling can be omitted during the service request process, regardless of the location of the corresponding UE 10 (e.g., TAI#1) during the following service request process of UE10.

[0115] At this time, some signaling omitted in the service request process may be a request message sent by the access control device 100 (e.g., AMF) to the session control device 200 (e.g., SMF) in order to obtain the N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UP of the UE 10, and a response message received from the session control device 200 (e.g., SMF).

[0116] That is, the access control device 100 (eg, AMF) may perform the remaining procedures ( Figure 2 4 and subsequent steps) without any request / response (e.g., SMF) sent to and received from the session control device 200 (e.g., SMF) during the service request process of the UE 10 in order to obtain the N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UP of the UE 10. Figure 2 Steps 2 and 3).

[0117] In addition, in a more detailed embodiment, the information transmission unit 220 can determine whether to send specific information (i.e., cache required information) based on the possibility related to whether information storage previously received from the access control device 100 (e.g., AMF) is possible (hereinafter, whether SR context caching is possible).

[0118] To this end, in the present disclosure, the access control device 100 (e.g., AMF) may transmit information indicating whether the access control device itself may cache the SR context to the session control device 200 (e.g., SMF), and the corresponding information may be sent using an additional field within an Nsmf_PDUSession_CreateSMContext request or an Nsmf_PDUSession_UpdateSMContext request.

[0119] The information transmission unit 220 of the session control device 200 (e.g., SMF) can determine whether to also send the cache required information during the (UE-triggered or NW UE-triggered) service request process of the UE 10 interacting with the corresponding access control device 100 (e.g., AMF) by using a message for sending the N2 PDU session resource establishment request transmission IE to the access control device 100 (e.g., AMF), based on the information indicating whether the SR context pre-received from the access control device 100 (e.g., AMF) can be cached.

[0120] In addition, in a more detailed embodiment, when a change in the N2PDU session resource establishment request transmission IE including the uplink tunnel of the UP is identified during the UE / RAN triggered PDU session modification procedure or the NW triggered PDU session modification procedure of the UE 10, the information transmission unit 220 can transmit specific information (cache required information) marking the identification information (n2CacheRequired) as the second identifier (false) to the access control device 100 (e.g., AMF).

[0121] That is, in conjunction with the uplink tunnel information of the UP of the UE 10, that is, the N2 SM information (=N2 PDU Session Resource Establishment Request Transport IE), information such as QoS information and N3 tunnel information may be changed.

[0122] In the present disclosure, changes in information such as N2 SM information (=N2 PDU session resource establishment request transmission IE) are identified, and the SR context stored (cached) in the access control device 100 (e.g., AMF) is no longer valid, so the cache required information indicated by n2CacheRequired=False can be transmitted to the access control device 100 (e.g., AMF), and a request to delete the SR context can be issued.

[0123] The reference by which the session control device 200 (eg, SMF) of the present disclosure determines / recognizes whether information such as N2 SM information (=N2 SM request) has changed may include the following changes.

[0124] -PDU session aggregation maximum bit rate

[0125] -ULNG-U UP TNL Information

[0126] -QoS process establishment request list

[0127] - Redundant ULNG-U UP TNL information

[0128] Based on receiving n2CacheRequired=False in the transmitted cache required information, the access control device 100 (e.g., AMF) can delete the SR context of the UE 10 stored (cached) by the previous cache required information, and perform the remaining operations of the UE / RAN triggered PDU session modification procedure or the NW triggered PDU session modification procedure being performed on the UE 10.

[0129] Then, refer to Figure 4 The configuration of the access control device 100 according to an embodiment of the present disclosure is described.

[0130] The access control device 100 of the present disclosure may be an AMF.

[0131] like Figure 4 As shown, the access control device 100 of the present disclosure includes a context identification unit 110 and a controller 120 .

[0132] All or at least some configurations of the access control apparatus 100 may be implemented in the form of a hardware module, a software module, or a combination of a hardware module and a software module.

[0133] The software module may be understood as, for example, an instruction executed by a processor configured to control calculations within the access control device 100 , and the instruction may be in a form installed in a memory within the access control device 100 .

[0134] Therefore, the access control device 100 of the present disclosure implements the SR process signaling reduction method proposed in the present disclosure through the above configuration, and hereinafter, each configuration within the access control device 100 used to implement the above SR process signaling reduction method will be described in more detail.

[0135] The context identification unit 110 performs a function of identifying whether there is a pre-stored specific context for the UE for activating a path of a user plane (UP).

[0136] A “UE for UP activated path” is a UE that performs a (UE triggered or NW triggered) service request procedure in a UP deactivated state, and thus UE 10 is described.

[0137] The specific context is an SR context stored (cached) by specific information (ie, “caching required information”) transmitted from the session control device 200 (SMF) of the present disclosure during the service request process previously performed as described above.

[0138] Specifically, the session control device 200 of the present disclosure can also send the cache required information during the service request process of UE 10 (UE triggered or NW UE triggered) by using a message for transmitting the N2PDU session resource establishment request transmission IE including the uplink tunnel information of UP to the access control device 100 (e.g., AMF).

[0139] When there is cache required information in the message sent from the session control device 200, the access control device 100 (eg, AMF) of the present disclosure stores (caches) information according to the corresponding cache required information, and the stored (cached) information corresponds to the SR context.

[0140] According to an embodiment of the present disclosure, in the present disclosure, the SR context can be defined as "taiRangeList" as the first information indicating TAI in units of a predetermined range that can be supported by UP or "allPLMN" as the second information indicating whether UP supports all TAIs, and "N2 SM information (=N2 PDU session resource establishment request transmission IE=N2 SM request)" as the N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UP of UE 10.

[0141] That is, when n2CacheRequired=true is received in the cache required information, the access control device 100 (eg, AMF) of the present disclosure may store (cache) "N2 SM information (=N2 SM request)" and "taiRangeList (or allPLMN)" as SR context accordingly.

[0142] For the UE 10 that performs a service request procedure (UE triggered or NW triggered), the context identification unit 110 identifies whether there is an SR context pre-stored (pre-cached) by the present disclosure.

[0143] When there is an SR context of UE 10 pre-stored (pre-cached) by the present disclosure, controller 120 performs a function of performing a UP path activation procedure (service request procedure) for UE 10 by using the corresponding SR context without performing some signaling with session control device 200 (eg, SMF).

[0144] Specifically, during the service request process of UE 10, controller 120 determines whether the location of UE 10 (eg, TAI#1) belongs to a TAI based on "taiRangeList" as first information and "allPLMN" as second information within a pre-stored (pre-cached) SR context.

[0145] For example, when taiRangeList is pre-stored (pre-cached) as the SR context, the controller 120 determines whether the location (eg, TAI#1) of the corresponding UE 10 belongs to the pre-stored (pre-cached) taiRangeList.

[0146] When allPLMN is stored (cached) as the SR context, the controller 120 determines that the location belongs to allPLMN regardless of the location of the corresponding UE 10 (eg, TAI#1).

[0147] Therefore, when it is determined that the location of the corresponding UE 10 (e.g., TAI#1) belongs to the taiRangeList (or allPLMN) within the SR context, the controller 120 can perform the remaining steps by reusing the N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UP in the SR context, without obtaining some signaling of the N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UP during the service request process at this time.

[0148] For example, when it is determined that there is a pre-stored (pre-cached) SR context of the corresponding UE 10 in the service request process of the UE 10, and the location of the corresponding UE 10 (for example, TAI#1) belongs to the taiRangeList (or allPLMN) within the SR context, the access control device 100 (for example, AMF) of the present disclosure can perform the remaining processes ( Figure 2 4 and subsequent steps in ), without any request / response (e.g., SMF) sent to and received from session control device 200 (e.g., SMF) in order to obtain N2PDU session resource establishment request transmission IE including uplink tunnel information of UP of UE10. Figure 2 2 and 3 in the previous step).

[0149] In addition, in a more detailed embodiment, when it is determined that the location of UE 10 (e.g., TAI) does not belong to TAI according to the first information (i.e., taiRangeList within the SR context) in the mobility-related process of UE 10, the controller 120 can delete the corresponding SR context and perform the remaining process.

[0150] That is, the location (e.g., TAI) may be changed according to the movement (e.g., handover) of the UE 10, and when it is determined in the present disclosure based on the taiRangeList within the SR context thereby that the location of the UE 10 (e.g., TAI) does not belong to the TAI, the pre-stored (pre-cached) SR context is no longer valid, thereby deleting the corresponding SR context.

[0151] Then, the access control device 100 (eg, AMF) in the present disclosure may delete the SR context of the UE 10 that was pre-stored (pre-cached) by previously caching required information, and perform the remaining procedures for the mobility-related procedures being performed for the UE 10.

[0152] Then, refer to Figure 4 The configuration of the UE device 10 according to an embodiment of the present disclosure is described.

[0153] The UE device 10 of the present disclosure includes a request unit 11 and a controller 12 .

[0154] All or at least some of the configurations of the UE device 10 may be implemented in the form of a hardware module, a software module, or a combination of a hardware module and a software module.

[0155] The software module may be understood as, for example, an instruction executed by a processor configured to control calculations within the UE device 10 , and the instruction may be in a form installed in a memory within the UE device 10 .

[0156] Therefore, the UE device 10 of the present disclosure supports the SR process signaling reduction method proposed in the present disclosure through the above configuration, and hereinafter, each configuration within the UE device 10 for implementing the above SR process signaling reduction method will be described in more detail.

[0157] The request unit 11 performs a function of sending a request for activating a path of a UP.

[0158] The activation of the UP path refers to the UP activation state, and the request for activating the UE path refers to a service request.

[0159] That is, when the UE device 10 needs to transmit uplink traffic in the UP deactivated state, the request unit 11 can transmit a UP activation request, that is, a service request, to the AMF (through the RAN).

[0160] The controller 12 may activate the path of UP according to the control of the access control device 100 (eg, AMF) receiving the request (ie, service request), and the UE device 10 may become a UP activation state.

[0161] The request (ie, service request) sent by the request unit 11 includes the location of the UE device 10 (eg, TAI#1).

[0162] At this time, the access control device 100 (e.g., AMF) receiving the service request can perform the UP service request process at this time based on the location of the UE device 10 identified in the service request (e.g., TAI#1) by reusing the specific context (SR context) pre-stored during the UP service request process previously performed for the UE device 10 without some signaling.

[0163] That is, when the access control device 100 (e.g., AMF) stores (caches) the taiRangeList as an SR context, and the location of the UE device 10 (e.g., TAI#1) belongs to the taiRangeList stored (cached) during the service request process of the UE 10, the service request process at this time can be performed without some signaling.

[0164] As described above, according to the session control device and access control device, the signaling control method executed by the device, and the UE device of the present disclosure, a detailed technical configuration that enables the service request process to be efficient can be achieved by reducing the signaling issued during the UE service request process.

[0165] Therefore, the present disclosure, by implementing a new technical method that can make the UE's service request process efficient, can achieve the effect of making the overall network performance more efficient in various aspects such as reducing the computing resource consumption of the service request process and reducing the delay of the connection between the UE and the data network.

[0166] In the following, reference will be made to Figures 5 to 8 An implementation scheme for implementing the SR process signaling reduction method performed by the present disclosure is described.

[0167] In the following, reference will be made to Figures 5 to 8 An implementation scheme for implementing the SR process signaling reduction method performed by the present disclosure is described.

[0168] first, Figure 5 A service request process according to an embodiment of the present disclosure is shown, in particular, a UE-triggered service request process performed through a signaling control method.

[0169] Refer to the following Figure 5 The initial service request procedure for UE 10 (first UE-triggered service request) is described.

[0170] 1-1. When UE 10 needs to transmit uplink traffic, it sends a service request to AMF 100 (through RAN). The request includes the location of UE 10 (e.g., TAI#1).

[0171] 1-2.AMF 100 selects the UPF that supports the corresponding TAI (e.g., TAI#1) for SMF 200, and requests to send N2 SM information (for receiving uplink tunnel information).

[0172] 1-3. After selecting the UPF, based on the corresponding TAI (e.g., TAI#1), the SMF 200 sends to the AMF 100 an N2 SM request and taiRangeList (or allPLMN) including tunnel information for uplink received by the corresponding UPF, and n2CahceRequired = true (true) supported by the selected UPF as "cache required information".

[0173] 1-4.AMF 100 stores the N2 SM request and taiRangeList (or allPLMN) in the cache as "SR context" by "caching required information", and sends the N2 request including the information received from SMF 200 to RAN. As a result, a path for transmitting uplink between UE 10 and 5G core is generated through RAN. RAN transmits N2 response (tunnel information for receiving downlink) to AMF 100.

[0174] 1-5.AMF 100 transmits the information received from RAN to SMF 200.

[0175] 1-6. SMF 200 sends tunnel information for transmitting downlink to UPF. Therefore, a path for transmitting downlink between UE 10 and 5G core is generated through UPF.

[0176] 1-7.SMF 200 sends an update response to AMF 100.

[0177] As described above, in the present disclosure, during the initial service request process (the first UE-triggered service request), the SMF 200 transmits the "cache required information" to the AMF 100 to allow the AMF 100 to store the "SR context", so that the SR context can be used (reused) to omit some signaling in the subsequent service request process of the UE 10.

[0178] That is, Figure 5 As shown, a case where a service request procedure (next UE-triggered service request) is performed on UE 10 in a UP deactivated state through an AN release procedure is described.

[0179] 2-1. When UE 10 needs to transmit uplink traffic, it sends a service request to AMF 100 (through RAN). The request includes the location of UE 10 (e.g., TAI#1). TAI can change according to the location of UE 10.

[0180] 2-4.AMF 100 identifies the taiRangeList stored in the cache, and, when the location of UE 10 (e.g., TAI#1) is within the taiRangeList, reuses the N2 SM request (in the case of allPLMN, reuses the N2 SM request without identifying the TAI). That is, AMF 100 can send the N2 SM request information to the RAN without the above steps 1-2 and 1-3. Thus, a path for transmitting the uplink between UE 10 and the 5G core is generated through the RAN. RAN transmits the N2 response (tunnel information for receiving the downlink) to the AMF 100.

[0181] 2-5.AMF 100 transmits the information received from RAN to SMF 200.

[0182] 2-6. SMF 200 sends tunnel information for transmitting downlink to UPF. Thus, a path for transmitting downlink between UE 10 and 5G core is generated through UPF.

[0183] 2-7.SMF 200 sends an update response to AMF 100.

[0184] Generally, since the AMF cannot know the UPF information that can be supported by the location of UE 10 (e.g., TAI#1) whenever a service request process is performed, the AMF should select the UPF and issue a request for sending the N2 SM information by always sending Nsmf_PDUSession_UpdateSMContext_Request to the SMF.

[0185] However, as described above, in the present disclosure, the traffic between AMF 100 and SMF 200 can be reduced by using (reusing) the "SR context" pre-stored in AMF 100 by using (reusing) the "cache required information" sent by SMF 200 in the previous service request process, thereby omitting some signaling during the subsequent service request process of UE 10.

[0186] Figure 6 The service request process according to an embodiment of the present disclosure is shown, in particular, a NW-triggered service request process performed by a signaling control method.

[0187] The following reference Figure 6 Provide explanation.

[0188] 1-1. When UPF receives downlink traffic but is in UP deactivated state, UPF sends a session report (Downlink Data Report (DLDR)) to SMF 200.

[0189] 1-2. SMF 200 sends an N2 SM request (UPF receives uplink tunnel information) while sending a paging request to AMF 100. At this time, SMF 200 also sends the taiRangeList (or allPLMN) supported by UPF and n2CahceRequired = true to AMF 100 as "caching required information".

[0190] 1-3.AMF 100 stores the N2 SM request and taiRangeList (or allPLMN) as "SR context" in the cache by "caching required information". After the paging is completed, AMF 100 identifies whether the location of UE 10 (e.g., TAI#1) is within the taiRangeList supportable by UPF, and when the location is within the taiRangeList, AMF 100 sends an N2 SM request to RAN by reusing the N2 SM information received in step 1-2 (reusing the N2 SM request without identifying the TAI in the case of allPLMN). Thus, a path for transmitting the uplink between UE 10 and the 5G core is generated through the RAN. RAN transmits the N2 response (tunnel information for receiving the downlink) to the AMF.

[0191] 1-4.AMF 100 transmits the information received from RAN to SMF 200.

[0192] 1-5. SMF 200 sends tunnel information for transmitting downlink to UPF. Therefore, a path for transmitting downlink between UE 10 and 5G core is generated through UPF.

[0193] 1-6.SMF 200 sends an update response to AMF 100.

[0194] As described above, in the present disclosure, during a NW-triggered service request, the SMF 200 transmits “cache required information” to the AMF 100 to allow the AMF 100 to store the “SR context” so that the SR context can be used (reused) to omit some signaling during subsequent service request procedures of the UE 10.

[0195] That is, Figure 6 As shown, a case where a UE-triggered service request is performed on a UE 10 in a UP deactivated state through an AN release procedure is described.

[0196] 2-1. When UE 10 needs to transmit uplink traffic, it sends a service request to AMF 100 (through RAN). The request includes the location of UE 10 (e.g., TAI#1). TAI can change according to the location of UE 10.

[0197] 2-4.AMF 100 identifies taiRangeList stored in the cache, and when the location of UE 10 (e.g., TAI#1) is within taiRangeList, AMF 100 reuses N2 SM request (reuses N2 SM request without identifying TAI in case of allPLMN). That is, AMF 100 can Figure 5 In the case of steps 1-2 and 1-3, the N2 SM request information is sent to the RAN. Therefore, a path for transmitting uplink between the UE 10 and the 5G core is generated through the RAN. The RAN transmits the N2 response (tunnel information for receiving downlink) to the AMF 100.

[0198] 2-5.AMF 100 transmits the information received from RAN to SMF 200.

[0199] 2-6. SMF 200 sends tunnel information for transmitting downlink to UPF. Thus, a path for transmitting downlink between UE 10 and 5G core is generated through UPF.

[0200] 2-7.SMF 200 sends an update response to AMF 100.

[0201] As described above, in the present disclosure, the traffic between AMF 100 and SMF 200 can be reduced by using (reusing) the "cache required information" sent by SMF200 during the previous service request process and pre-stored in AMF 100, thereby omitting some signaling during the subsequent service request process of UE 10.

[0202] In particular, according to the NW-triggered service request process of the present disclosure, SMF 200 does not use a TAI list including individual TAIs, but transmits taiRangeList to AMF 100, and AMF 100 uses (reuses) taiRangeList, thereby producing the effect of omitting / reducing signaling during the service request process.

[0203] In addition, according to the NW-triggered service request process of the present invention, unlike the conventional situation of listing and using individual TAIs, when TAIs are added due to an increase in base stations by using taiRangeList, the service request process can be made efficient and the overall network performance can also be made more efficient in all aspects due to the lack of need to add SMF configuration and the possibility of reuse of N2 SM requests.

[0204] Figure 7 The process of an implementation method of deleting the SR context through a signaling control method is shown, in particular, the process of an implementation method in which the AMF actively performs deletion according to the present disclosure.

[0205] The following reference Figure 7 Describes the functionality of the present disclosure that is deleted when the SR context stored by the AMF 100 is no longer valid.

[0206] 1. The premise is that after receiving the cache required information from SMF 200, the service request process according to the SR process signaling reduction method of the present disclosure is performed and AMF 100 pre-stores the SR context.

[0207] 2.UE / RAN can perform mobility-related procedures (e.g., handover) with AMF 100 based on the movement of UE 10.

[0208] 3. The AMF 100 identifies whether the location of the UE 10 received in the mobility-related procedure is included in the taiRangeList in the SR context, and deletes the SR context when the location is not included in the taiRangeList. When the location is included in the taiRangeList, the SR context is not deleted.

[0209] 4. Thereafter, the AMF 100 performs the remaining mobility-related procedures in the same manner.

[0210] As described above, since the AMF 100 does not have an SR context during the initial service request after deleting the SR context, there is no signaling reduction effect of the present disclosure, but the signaling reduction effect of the present disclosure starts from executing the following service request process.

[0211] Figure 8 The flowchart of an implementation method of deleting an SR context through a signaling control method is shown, in particular, the flowchart of an implementation method of deleting by an SMF according to the present disclosure.

[0212] The following reference Figure 8 Describes the functionality of the present disclosure that is deleted when the SR context stored by the AMF 100 is no longer valid.

[0213] 1. The premise is that after receiving the cache required information from SMF 200, the service request process according to the SR process signaling reduction method of the present disclosure is performed and AMF 100 pre-stores the SR context.

[0214] 2a. When the PDU session needs to be changed, the UE / RAN performs a modification procedure (PDU session modification procedure triggered by UE / RAN). In this case, changes can be made to the N2 SM information, such as QoS changes.

[0215] 2b. When the PDU session needs to be changed, the PCF performs a modification process (PDU session modification process triggered by the NW). In this case, the N2 SM information can be modified, such as QoS changes.

[0216] 3. SMF 200 can detect whether the N2 SM information is changed by step 2a or 2b.

[0217] 4. When a change is detected, SMF 200 transmits cache required information marked as n2CacheRequired=False to AMF 100 in order to delete the SR context stored in AMF 100.

[0218] 5.AMF 100 identifies n2CacheRequired=False in the received cache required information and deletes the pre-stored SR context.

[0219] As described above, since the AMF 100 does not have an SR context during the initial service request after deleting the SR context, there is no signaling reduction effect of the present disclosure, but the signaling reduction effect of the present disclosure starts from executing the following service request process.

[0220] As described above, according to the data transmission method of the present disclosure, additional delays in data transmission can be prevented and data transmission delays can be minimized by avoiding the induction / initiation of a network-triggered service request process that is additionally performed in the "situation where signaling processing is slower than the data transmission rate" of downlink data of the UE transmitted / introduced to the UPF during the CP path (re)generation process.

[0221] The signal control method and data processing method according to the embodiment of the present disclosure can be implemented in the form of program commands, which can be configured to be executed by various computer means and recorded on a computer-readable medium. The computer-readable medium can include program commands, data files, data structures, etc., alone or in combination. The program commands recorded on the medium can be specially designed and configured for the present disclosure, or are known and available to computer software technicians. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and tapes, optical media such as CD-ROMs and DVDs, magneto-optical media such as floppy disks, and hardware devices such as ROM, RAM, flash memory, etc. that are specially configured to store and execute program commands. Examples of program commands include high-level language codes that can be executed by a computer using an interpreter, and machine language codes generated by a compiler. The above-mentioned hardware devices can be configured to act as one or more software modules to perform the operation of the present disclosure, and vice versa.

[0222] Although the present disclosure has been described in detail with reference to preferred embodiments, the present disclosure is not limited to the above-mentioned embodiments, and the technical ideas of the present disclosure extend to such an extent that any person having ordinary knowledge in the technical field to which the present disclosure belongs can make various changes or modifications without departing from the main points of the present disclosure as claimed in the attached claims.

Claims

1. A device for controlling a session, the device comprising: an identification unit configured to identify a user equipment UE for activating a path of a user plane UP; as well as An information transmission unit is configured to transmit specific information related to information storage to an access control device during a UP path activation procedure of the UE, so as to allow the access control device to omit some signaling by using the specific information during the UP path activation procedure of the UE.

2. The device according to claim 1, wherein: The specific information is sent using a specific message for sending an N2 PDU session resource establishment request transmission IE including uplink tunnel information of the UP of the UE to the access control device.

3. The device according to claim 2, wherein: The specific information includes: identification information, the identification information marking a first identifier or a second identifier, the first identifier is used to store the information constituting the specific information and the N2 PDU session resource establishment request transmission IE as a specific context, and the second identifier is used to delete the specific context pre-stored by the previous specific information; and The first information or the second information when the first identifier is marked in the identification information, the first information indicates a tracking area identifier TAI in units of a predetermined range that the UP can support, and the second information indicates whether the UP supports all TAIs.

4. The device according to claim 2, wherein: The specific message is an Nsmf_PDUSession_UpdateSMContext response message when the UP path activation procedure is a UE-triggered service request procedure, and is a Namf_Communication_N1N2MessageTransfer request message when the UP path activation procedure is a NW-triggered service request procedure or a PDU session establishment procedure.

5. The device according to claim 1, wherein: The information transmission unit is configured to determine whether to transmit the specific information based on a possibility related to information storage received in advance from the access control device.

6. The device according to claim 2, wherein: The some signaling is a request message sent by the access control device to a device for controlling the session and a response message received from the device in order to obtain the N2 PDU session resource establishment request transmission IE of the UE.

7. The device according to claim 2, wherein: The information transmission unit is configured to, when a change of the N2PDU session resource setting request transmission IE is identified during a UE / RAN triggered PDU session modification procedure or a NW triggered PDU session modification procedure of the UE, transmit the specific information with the identification information as the second identifier to the access control device, so as to allow the access control device to delete the specific context pre-stored by the previous specific information according to the specific information and perform the remaining procedures.

8. A device for controlling access, the device comprising: a context identification unit configured to identify whether there is a pre-stored specific context for a user equipment UE for activating a path of a user plane UP; as well as A controller is configured to perform a UP path activation procedure for the UE by using the specific context if the specific context exists without some signaling with a session control device.

9. The device according to claim 8, wherein: The specific context is stored by specific information transmitted from the session control device during the UP path activation procedure previously performed for the UE, and is defined by first information indicating a tracking area identifier TAI in units of a predetermined range supportable by the UP or second information indicating whether the UP supports all TAIs, and an N2 PDU session resource establishment request transmission IE including uplink tunnel information of the UP of the UE.

10. The device according to claim 9, wherein: The controller is configured to transmit to the session control device whether the device for controlling access is capable of storing a specific context, so as to allow the session control device to determine whether to send the specific information.

11. The device according to claim 8, wherein: The controller is configured to perform the remaining procedures by reusing the N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UP within the specific context, when it is determined that the location of the UE belongs to the TAI during the UP path activation procedure of the UE based on the first information or the second information within the specific context, without the need for obtaining some of the signaling of the N2 PDU session resource establishment request transmission IE including the uplink tunnel information of the UP of the UE.

12. The device according to claim 8, wherein: The controller is configured to, if it is determined according to the first information in the specific context that the location of the UE does not belong to the TAI during the mobility-related process of the UE, delete the specific context and perform the remaining process.

13. A user equipment (UE) device, the UE device comprising: a request unit configured to send a request for activating a path of a user plane UP; as well as a controller configured to activate a path of the UP by controlling an access control device that receives the request, wherein the request includes the location of the UE device, and The access control device is configured to perform a UP path activation procedure based on the location of the UE device identified in the request, by reusing a specific context pre-stored during a UP path activation procedure previously performed for the UE device, without requiring some signaling during the UP path activation procedure.

14. A method for controlling signaling performed by a session control device, the method comprising the following steps: an identification step of identifying a user equipment UE for activating a path of a user plane UP; as well as An information transmitting step of transmitting specific information related to information storage to an access control device during a UP path activation procedure of the UE, so as to omit some signaling by using the specific information during a subsequent UP path activation procedure of the UE.

15. A control signaling method performed by an access control device, the method comprising the following steps: a context identification step for identifying whether there is a pre-stored specific context for the user equipment UE for activating the path of the user plane UP; as well as A control step of performing a UP path activation procedure for the UE by using the specific context in the presence of the specific context without some signaling with a session control device.

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