Method and apparatus for obtaining routing information - Patents.com

Abstract

An embodiment of the present disclosure provides a method and apparatus for routing information acquisition. The method performed by a first network function includes sending a first request to a second network function. The first request is for receiving at least one registration data set for a service for a user equipment (UE). The method further includes receiving a first response from the second network function. If there is an error related to the UE's routing for the service, the first response includes a status code indicating the error related to the UE's routing for the service. If there is no error related to the UE's routing for the service, the first response includes the at least one registration data set for the service for the UE.

Description

[Technical field]

[0001] TECHNICAL FIELD The non-limiting exemplary embodiments of the present disclosure relate generally to the field of communications, and more particularly to a method and apparatus for obtaining routing information. [Background technology]

[0002] This section introduces aspects that may facilitate a better understanding of the disclosure. Accordingly, the statements in this section should be read in this light and not understood as admissions about what is in the prior art or what is outside the prior art.

[0003] In a communication network, such as Long Term Evolution (LTE) and New Radio (NR) as defined by the Third Generation Partnership Project (3GPP), various registration information may be stored in various network entities. A network entity or network function (NF) may obtain a type of registration information from another network entity or network function that may store the registration information.

[0004] For example, a registration service operation may be initiated by an NF that selects to provide a service to a user equipment (UE) in order to store the relevant UE context management (UECM) information in a unified data management (UDM) whose consumers are the Access and mobility Function (AMF) for access and mobility management services, the Session Management Function (SMF) for session management services, the Short Message Service Function (SMSF) for short message service (SMS) services, and the home subscriber server (HSS) for an Internet protocol-Short Message-Gateway (IP-SM-GW) in an SMS over IP (SMSoIP) scenario. As part of this registration procedure, the UDM may authorize or deny a subscriber to use the services provided by the registered NF based on subscription data (e.g. roaming restrictions).

[0005] 3GPP TS 29.503 V17.1.0, the disclosure of which is incorporated herein by reference in its entirety, describes various registration service operations, such as: - AMF Registration for 3GPP Access - AMF registration for non-3GPP access - SMF registration - SMSF registration for 3GPP access - SMSF registration for non-3GPP access - IP-SM-GW registration

[0006] Figure 1a shows the procedure for requesting SMSF registration information of a UE for 3GPP access. Figure 1 is identical to Figure 5.3.2.5.5-1 of 3GPP TS 29.503 V17.1.0.

[0007] Figure 1a shows a scenario where an NF service consumer (e.g., a Network Exposure Function (NEF)) sends a request to a UDM to obtain SmsfRegistration information for a UE. The request includes the UE's identity ( / {ueId}), which is assumed to be a Generic Public Subscription Identifier (GPSI), the type of information requested ( / registrations / smsf-3gpp-access), and query parameters (supported-features).

[0008] Step 1. An NG service consumer (eg, NEF) sends a GET request to a resource representing the UE's SMSF registration information for 3GPP access, with a query parameter indicating supported-features.

[0009] Step 2a. The UDM responds with a "200 OK" with a message body containing the UE's SmsfRegistration for 3GPP access.

[0010] Step 2b. If the UE does not have the required subscription data for SMS service or SMS service is prohibited, a HyperText Transfer Protocol (HTTP) status code "403 Forbidden" should be returned with additional error information in the response body (in the "ProblemDetails" element).

[0011] In case of failure, an appropriate HTTP status code MUST be returned indicating the error, and any appropriate additional error information MUST be returned in the GET response body.

[0012] Figure 1b shows a procedure for requesting SMSF registration information of a UE for non-3GPP access. Figure 1b is identical to Figure 5.3.2.5.6-1 of 3GPP TS 29.503 V17.1.0.

[0013] Figure 1b shows a scenario where an NF service consumer (e.g., NEF) sends a request to the UDM to obtain the UE's SmsfRegistration information for non-3GPP access. The request includes the UE's identity ( / {ueId}), which is assumed to be GPSI, the type of information requested ( / registrations / smsf-non-3gpp-access), and query parameters (supported-features).

[0014] Step 1. An NG service consumer (eg, NEF) sends a GET request for a resource representing the UE's SMSF registration information for non-3GPP access, with a query parameter indicating supported-features.

[0015] Step 2a. The UDM responds with a "200 OK" with a message body containing the UE's SmsfRegistration for non-3GPP access.

[0016] Step 2b. If the UE does not have the required subscription data for the SMS service or the SMS service is prohibited, the HTTP status code "403 Forbidden" should be returned with additional error information in the response body (in the "ProblemDetails" element).

[0017] In case of failure, an appropriate HTTP status code MUST be returned indicating the error, and any appropriate additional error information MUST be returned in the GET response body.

[0018] Figure 1c shows the procedure of obtaining multiple UE registration data sets. Figure 1c is identical to Figure 5.3.2.5.10-1 of 3GPP TS29.503V17.1.0.

[0019] Figure 1c illustrates a scenario in which an NF service consumer (e.g., HSS, network data analytics function (NWDAF), Network Slice-Specific Authentication and Authorization Function (NSSAAF)) sends a request to UDM to receive multiple UE registration data sets. In this example scenario, multiple AMF registration data sets for the UE are obtained in a single request. For other data sets that can be obtained in a single request, see 3GPP TS29.503V17.1.0, section 6.2.6.3.6. The request includes the resource of the UE's registrations ({ueId} / registrations) and a query parameter identifying the requested registration data sets (in this example, ?registration-dataset-names=AMF_3GPP, AMF_NON_3GPP).

[0020] Step 1. The NF service consumer (e.g., HSS, NWDAF) sends a GET request to a resource representing the UE's registration. The query parameters indicate the UE registration data set being requested.

[0021] Step 2. The UDM responds with a "200 OK" with a message body containing the requested UE registration data set.

[0022] In case of failure, an appropriate HTTP status code MUST be returned indicating the error, and any appropriate additional error information MUST be returned in the GET response body.

[0023] Section 6.2.3.6.3.3 of 3GPP TS 29.503 V17.1.0 describes the GET method, which is intended to support the Uniform Resource Identifier (URI) query parameters specified in Table 1, which is the same as Table 6.2.3.6.3.3-1 of 3GPP TS 29.503 V17.1.0. [Table 1]

[0024] The GET method is intended to support the request data structure specified in Table 2, which is the same as Table 6.2.3.6.3.3-2 of 3GPP TS 29.503 V17.1.0, and the response data structure and response codes specified in Table 3, which is the same as Table 6.2.3.6.3.3-3 of 3GPP TS 29.503 V17.1.0. [Table 2] [Table 3]

[0025] Section 6.2.3.7.3.3 of 3GPP TS29.503V17.1.0 describes the GET method.

[0026] The GET method is intended to support the URI query parameters specified in Table 4, which is the same as Table 6.2.3.7.3.3-1 of 3GPP TS 29.503 V17.1.0. [Table 4]

[0027] The GET method is intended to support the request data structure specified in Table 5, which is the same as Table 6.2.3.7.3.3-2 of 3GPP TS 29.503 V17.1.0, and the response data structure and response codes specified in Table 6, which is the same as Table 6.2.3.7.3.3-3 of 3GPP TS 29.503 V17.1.0. [Table 5] [Table 6] Summary of the Invention

[0028] This Summary is provided to introduce certain concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.

[0029] A use case exists for a network device / function such as a Short Message Service-Gateway Mobile Switching Center (SMS-GMSC) / IP-SM-GW / SMS Router or NEF to obtain the UE's routing for that service (e.g., SMS routing information for a UE registered in a 5G system), and the request is to be serviced by a 3GPP defined service such as the Nudm UECM (UE Context Management) GET service as described in 3GPP TS29.503 V17.1.0.

[0030] However, an obvious problem is that the prior art Nudm UECM GET service does not indicate to the service consumer that a UE is unable to reach a service such as SMS, and does not provide any information to the service consumer that a sub-service of a service (such as Mobile Terminated (MT)-SMS) is either forbidden or that a sub-service of a service such as MT-SMS is not provided.

[0031] For example, a service consumer such as a NEF can obtain information about an SMSF as 5G domain SMS routing information by UECM GET SMSF for 3GPP access or by UECM GET SMSF for non-3GPP access, or by UECM GET registration data sets for SMSF for 3GPP access and SMSF for non-3GPP access. However, the above service operations are not standardized to return a precise condition in the cause attribute based on the result of SMS subscription check and / or SMS waiting status check.

[0032] To overcome or mitigate at least the above-mentioned or other problems, embodiments of the present disclosure propose an improved routing information acquisition solution.

[0033] In a first aspect of the present disclosure, there is provided a method performed by a first network function, the method including sending a first request to a second network function, the first request requesting to receive at least one registration data set for a service for a user equipment (UE), the method further including receiving a first response from the second network function, where if there is an error related to the UE's routing for the service, the first response includes a status code indicating an error related to the UE's routing for the service, and if there is no error related to the UE's routing for the service, the first response includes the at least one registration data set for the service for the UE.

[0034] In one embodiment, the status code indicating an error related to the UE's routing for the service includes at least one of a HyperText Transfer Protocol (HTTP) status code '403 Forbidden' with a cause attribute used to indicate the error related to the UE's routing for the service, or a HTTP status code '404 Not Found' with a cause attribute used to indicate the error related to the UE's routing for the service.

[0035] In one embodiment, the error related to the UE's routing for the service includes at least one of: the UE subscribes to the service but a sub-service of the service is prohibited; the UE subscribes to the service but a sub-service of the service is not provided; or the UE subscribes to the service but the UE is not reachable by the service.

[0036] In one embodiment, the sub-service of the service includes at least one of a mobile terminated service or a mobile originated service.

[0037] In one embodiment, the service includes a short message service.

[0038] In one embodiment, the at least one registration data set for the service for the UE includes at least one of Short Message Service Function (SMSF) registration information of the UE for Third Generation Partnership Project (3GPP) access or SMSF registration information of the UE for non-3GPP access.

[0039] In one embodiment, the method further includes sending a second request to the second network function when the error related to the UE's routing for the service indicates that the UE has subscribed to the service but the UE is not able to reach the service, the second request requesting to alert the service function when the UE is able to reach the service.

[0040] In one embodiment, the first network function includes at least one of a Short Message Service-Gateway Mobile Switching Center (SMS-GMSC), an Internet Protocol-Short Message-Gateway (IP-SM-GW), an SMS Router, a Service Capability Exposure Function (SCEF), or a Network Exposure Function (NEF).

[0041] In one embodiment, the second network function includes at least one of a unified data management (UDM), a home subscriber server (HSS), or a home location register (HLR).

[0042] In one embodiment, the first request is an HTTP GET request and the first response is an HTTP GET response.

[0043] In a second aspect of the present disclosure, there is provided a method performed by a second network function, the method including receiving a first request from a first network function, the first request requesting to receive at least one registration data set for a service for a user equipment (UE). The method further includes determining whether there is an error related to UE routing for the service. The method further includes sending a first response to the first network function. If there is an error related to UE routing for the service, the first response includes a status code indicating an error related to UE routing for the service. If there is no error related to UE routing for the service, the first response includes the at least one registration data set for the service for the UE.

[0044] In one embodiment, the method further includes receiving a second request from the first network function when the error related to the UE's routing for the service indicates that the UE has subscribed to the service but the UE is not reachable by the service, the second request requesting to alert the function of the service when the UE is reachable by the service, and the method further includes sending an alert message to the function of the service indicating that the UE is reachable by the service.

[0045] In one embodiment, determining whether there is an error related to UE routing for the service includes: obtaining subscription data of the service for the UE, where the subscription data of the service for the UE includes subscription information regarding whether the UE subscribes to the service; obtaining administrative subscription data of the service for the UE, where the administrative subscription data of the service for the UE includes subscription information regarding whether the UE subscribes to a sub-service of the service and / or a barring control policy; and determining whether there is an error related to UE routing for the service based on the subscription data of the service for the UE and the administrative subscription data of the service for the UE.

[0046] In one embodiment, at least one of the subscription data for the service of the UE and the administrative subscription data for the service of the UE is obtained from a Uniform Data Repository (UDR).

[0047] In one embodiment, determining whether there is an error related to UE routing for the service includes: obtaining registration data of capabilities of the service for the UE; obtaining standby status data of the service for the UE, where the standby status data of the service for the UE includes information regarding whether the UE is able to reach the service; and determining whether there is an error related to UE routing for the service based on the registration data of capabilities of the service for the UE and the standby status data of the service for the UE.

[0048] In one embodiment, at least one of the registration data of the capabilities of the service for the UE and the standby status data of the service for the UE is obtained from a UDR.

[0049] In a third aspect of the present disclosure, a method and a first network function are provided. The first network function comprises a processor and a memory coupled to the processor. The memory includes instructions executable by the processor. The first network function is operable to send a first request to a second network function. The first request is for receiving at least one registration data set for a service for a user equipment (UE). The first network function is further operable to receive a first response from the second network function. If there is an error related to the UE's routing for the service, the first response includes a status code indicating an error related to the UE's routing for the service. If there is no error related to the UE's routing for the service, the first response includes the at least one registration data set for the service for the UE.

[0050] In a fourth aspect of the present disclosure, a second network function is provided. The second network function comprises a processor and a memory coupled to the processor. The memory includes instructions executable by the processor. The second network function is operable to receive a first request from a first network function. The first request is for receiving at least one registration data set for a service for a user equipment (UE). The second network function is further operable to determine whether there is an error associated with UE routing for the service. The second network function is further operable to send a first response to the first network function. If there is an error associated with UE routing for the service, the first response includes a status code indicating an error associated with UE routing for the service. If there is no error associated with UE routing for the service, the first response includes at least one registration data set for the service for the UE.

[0051] In a fifth aspect of the present disclosure, a first network function is provided. The first network function includes a first transmitting module and a receiving module. The first transmitting module may be configured to transmit a first request to a second network function. The first request is for receiving at least one registration data set for a service for a user equipment (UE). The receiving module may be configured to receive a first response from the second network function. If there is an error related to the UE's routing for the service, the first response includes a status code indicating an error related to the UE's routing for the service. If there is no error related to the UE's routing for the service, the first response includes the at least one registration data set for the service for the UE.

[0052] In one embodiment, the first network function may further comprise a second sending module configured to send a second request to the second network function when the error related to the UE's routing for the service indicates that the UE has subscribed to the service but the UE is not able to reach the service, the second request requesting to alert the service function when the UE is able to reach the service.

[0053] In a sixth aspect of the present disclosure, a second network function is provided. The second network function includes a first receiving module, a determining module, and a first sending module. The first receiving module may be configured to receive a first request from a first network function. The first request is for receiving at least one registration data set for a service for a user equipment (UE). The determining module may be configured to determine whether there is an error related to UE routing for the service. The first sending module 1203 may be configured to send a first response to the first network function. If there is an error related to UE routing for the service, the first response includes a status code indicating an error related to UE routing for the service. If there is no error related to UE routing for the service, the first response includes at least one registration data set for the service for the UE.

[0054] In one embodiment, the second network function may further comprise a second receiving module configured to receive a second request from the first network function when the error related to the UE's routing for the service indicates that the UE has subscribed to the service but the UE is not able to reach the service, the second request requesting to alert the service function when the UE is able to reach the service.

[0055] In one embodiment, the second network function may further comprise a second sending module for sending an alert message to the function of the service indicating that the UE is reachable by the service.

[0056] In a seventh aspect of the present disclosure, there is provided a computer program product comprising instructions which, when executed by at least one processor, cause the at least one processor to perform a method according to either one of the first or second aspects.

[0057] In an eighth aspect of the present disclosure, there is provided a computer-readable storage medium storing a set of instructions which, when executed on at least one processor, cause the at least one processor to perform a method according to either one of the first or second aspects.

[0058] Embodiments herein may provide many advantages, a non-exhaustive list of examples of which follows: In some embodiments herein, the second network function may send a precise status code to the first network function indicating an error related to the UE's routing for the service. For example, for an SMS routing information request, a precise cause such as ABSENT_SUBSCRIBER_SM, MTSMS_BARRED, MTSMS_NOT_PROVISIONED may be sent to the UDM UECM GET service consumer. In some embodiments herein, the NF consumer may differentiate between error conditions. In some embodiments herein, the proposed solution may avoid unnecessary signaling when the UE is not reachable for a service, such as SMS. In some embodiments herein, the first network function may request the second network function to alert the service function when the UE is reachable for the service. For example, the service consumer could ask the UDM to add the SC address to the SMS waiting data list. Once the UE is reachable for SMS, the UDM could alert the SC for pending SMS retransmissions. Some embodiments herein may optimize services such as SMS delivery. The embodiments herein are not limited to the features and advantages mentioned above. Those skilled in the art will recognize additional features and advantages after reading the following detailed description. [Brief description of the drawings]

[0059] The above and other aspects, features and advantages of various embodiments of the present disclosure will become more fully apparent, by way of example, from the following detailed description, taken in conjunction with the accompanying drawings, in which like reference numbers or letters are used to designate similar or equivalent elements. The drawings are presented to facilitate a better understanding of the embodiments of the present disclosure, are not necessarily drawn to scale, and are as follows:

[0060] [Figure 1a] 1 shows a procedure for requesting UE SMSF registration information for 3GPP access.

[0061] [Figure 1b] 1 shows a procedure for requesting SMSF registration information of a UE for non-3GPP access.

[0062] [Figure 1c] 1 illustrates a procedure for obtaining multiple UE registration data sets.

[0063] [Diagram 2] 1 illustrates a schematic diagram of a high-level architecture within a 5G network according to one embodiment of the present disclosure.

[0064] [Diagram 3] 1 illustrates a schematic diagram of a system architecture in a 4G network according to an embodiment of the present disclosure.

[0065] [Figure 4] 1 shows a flowchart of a method according to an embodiment of the present disclosure.

[0066] [Diagram 5] 4 shows a flowchart of a method according to another embodiment of the present disclosure.

[0067] [Figure 6] 4 shows a flowchart of a method according to another embodiment of the present disclosure.

[0068] [Figure 7] 1 illustrates a flowchart for obtaining SMSF registration data for 3GPP access according to one embodiment of the present disclosure.

[0069] [Figure 8] 1 illustrates a flowchart for obtaining SMSF registration data for non-3GPP access according to one embodiment of the present disclosure.

[0070] [Figure 9] 1 illustrates a flowchart for obtaining SMSF registration data for non-3GPP access and SMSF registration data for 3GPP access according to one embodiment of the present disclosure.

[0071] [Figure 10] FIG. 1 is a block diagram illustrating an apparatus suitable for practicing some embodiments of the present disclosure.

[0072] [Figure 11] FIG. 2 is a block diagram illustrating a first network function according to an embodiment of the present disclosure.

[0073] [Figure 12] FIG. 2 is a block diagram illustrating a second network function according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0074] The embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. It should be understood that the embodiments are discussed merely for the purpose of enabling those skilled in the art to better understand and implement the present disclosure, rather than implying any limitation on the scope of the present disclosure. Throughout this specification, references to features, advantages, or similar terms do not imply that all of the features and advantages that may be realized with the present disclosure should or will be present in any single embodiment of the present disclosure. Rather, terms referring to features and advantages are understood to mean that the particular features, advantages, or characteristics described in connection with an embodiment are included in at least one embodiment of the present disclosure. Furthermore, the features, advantages, and characteristics of the present disclosure that are described may be combined in any suitable manner in one or more embodiments. Those skilled in the art will recognize that the present disclosure may be practiced without one or more of the specific features or advantages of a specific embodiment. In other instances, additional features and advantages may be recognized in an embodiment, which may not be present in all embodiments of the present disclosure.

[0075] As used herein, the term "network" refers to a network conforming to any suitable communications standard, such as New Radio (NR), Long Term Evolution (LTE), LTE-Advanced, Wideband Code Division Multiple Access (WCDMA), High Speed ​​Packet Access (HSPA), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Code Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), and other wireless networks. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA). UTRA includes other derivatives of WCDMA and CDMA. A TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM). An OFDMA network may implement radio technologies such as Evolved UTRA (E-UTRA), Ultra Mobile Broadband, IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDMA, ad-hoc networks, wireless sensor networks, etc. In the following description, the terms "network" and "system" may be used interchangeably. Furthermore, communication between two devices in a network may be performed according to any suitable communication protocol, including, but not limited to, communication protocols as defined by a standardization body such as 3GPP. For example, the communication protocol may include first generation (1G), 2G, 3G, 4G, 4.5G, 5G communication protocols, and / or any other protocols either currently known or to be developed in the future.

[0076] The term "Network Function (NF)" refers to any suitable Network Function (NF) that can be implemented in a network entity (physical or virtual) of a communication network. For example, the Network Function may be implemented either as a network element on dedicated hardware, as a software instance running on dedicated hardware, or as a virtualized function instantiated on a suitable platform, e.g., a cloud infrastructure. For example, a 5G system (5GS) may include multiple NFs such as an Access and Mobility Function (AMF), a Session Management Function (SMF), an Authentication Service Function (AUSF), a Unified Data Management (UDM), a Policy Control Function (PCF), an Application Function (AF), a Network Exposure Function (NEF), a User Plane Function (UPF), and a Network Repository Function (NRF), a Radio Access Network (RAN), a Service Communication Proxy (SCP), a Network Data Analytics Function (NWDAF), a Network Slice Selection Function (NSSF), a Network Slice Specific Authentication and Authorization Function (NSSAAF), etc. For example, a 4G system (such as LTE) may include multiple NFs, such as a Mobility Management Entity (MME), a Home Subscriber Server (HSS), a Proxy and Charging Rules Function (PCRF), a Packet Data Network Gateway (PGW), a PGW Control Plane (PGW-C), a Serving Gateway (SGW), a SGW Control Plane (SGW-C), an E-UTRAN Node B (eNB), etc. In other embodiments, the network functions may include different types of NFs, depending, for example, on the particular network.

[0077] The term "terminal device" refers to any end device capable of accessing and receiving services from a communications network. By way of example and not limitation, a terminal device may refer to a mobile terminal, a user equipment (UE), or other suitable device. A UE may be, for example, a subscriber station (SS), a portable subscriber station, a mobile station (MS), or an access terminal (AT). Terminal devices may include, but are not limited to, portable computers, imaging terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, mobile phones, cellular phones, smartphones, voice over IP (VoIP) phones, wireless local loop phones, tablets, wearable devices, personal digital assistants (PDAs), portable computers, desktop computers, wearable terminal devices, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE), laptop-mounted equipment (LME), USB dongles, smart devices, and wireless customer-premises equipment (CPE). In the following description, "terminal device", "terminal", "user equipment" and "UE" may be used interchangeably. As one example, a terminal device may represent a UE configured for communication according to one or more communication standards promulgated by the 3rd Generation Partnership Project (3GPP), such as the LTE or NR standards of the 3GPP. As used herein, "user equipment" or "UE" may not necessarily have a "user" in the sense of a human user who owns and / or operates the associated device. In some embodiments, a terminal device may be configured to transmit and / or receive information without direct human interaction. For example, a terminal device may be designed to transmit information to a network on a predetermined schedule, when triggered by an internal or external event, or upon a request from the communication network.Alternatively, a UE may represent a device that is intended for sale to or operation by a human user, but that may not initially be associated with a particular human user.

[0078] As yet another example, in an Internet of Things (IoT) scenario, a terminal device may represent a machine or other device that performs monitoring and / or measurements and transmits results of such monitoring and / or measurements to other terminal devices and / or network equipment. The terminal device may in this case be a Machine-to-Machine (M2M) device, which may also be referred to as a Machine-Type Communication (MTC) device in the 3GPP context. As one specific example, the terminal device may be a UE implementing the 3GPP Narrowband IoT (NB-IoT) standard. Specific examples of such machines or devices are sensors, metering devices such as power meters, industrial machines, or home or personal appliances, e.g., refrigerators, televisions, watches, and other personal wearables. In other scenarios, the terminal device may represent a vehicle or other equipment that can monitor and / or report on its operating status or other functions associated with its operation.

[0079] References herein to "one embodiment," "an embodiment," "an exemplary embodiment," and the like indicate that, while a described embodiment may include a particular feature, structure, or characteristic, not all embodiments necessarily include that particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in the context of one embodiment, it is contemplated that it is within the knowledge of one of ordinary skill in the art to operate such feature, structure, or characteristic in the context of other embodiments, whether or not explicitly stated.

[0080] It is to be understood that although terms such as "first," "second," and the like may be used herein to describe various elements, such elements are not to be limited by these terms. These terms are merely used to distinguish one element from another. For example, a first element could be referred to as a second element, and similarly, a second element could be referred to as a first element, without departing from the scope of the exemplary embodiments. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0081] As used herein, the phrases "at least one of A and / or B" or "at least one of A or B" should be understood to mean "A only, B only, or both A and B." The phrase "A and / or B" should be understood to mean "A only, B only, or both A and B."

[0082] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the concepts described herein. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "has," "having," "includes," and / or "including," as used herein, specify the presence of stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0083] It should be noted that these terms, as used in this document, are used only for ease of description and distinction between nodes, devices, networks, etc. As technology develops, other terms having similar / identical meanings may also be used.

[0084] In the following description and claims, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise defined.

[0085] Although the subject matter described herein may be implemented in any suitable type of system using any suitable components, the embodiments disclosed herein are described in the context of a communication system made with the exemplary system architecture shown in Figures 2-3. For simplicity, the system architecture in Figures 2-3 depicts only some exemplary elements. In practice, the communication system may further include any additional elements suitable for supporting communications between terminal devices or between terminal devices and other communication devices, such as a landline telephone, a service provider, or any other network node or terminal device. A communication system may provide communications and various types of services to one or more terminal devices to facilitate the terminal device's access to and / or use of services provided by or through the communication system.

[0086] FIG. 2 illustrates a schematic diagram of a high-level architecture in a fifth generation network according to an embodiment of the present disclosure. For example, the fifth generation network may be a 5GS. The architecture in FIG. 2 is identical to FIG. 4.2.3-1 described in 3GPP TS23.501V16.5.1, the disclosure of which is incorporated herein by reference in its entirety. The system architecture in FIG. 2 may include several exemplary elements, such as AUSF, AMF, DN (data network), NEF, NRF, NSSF, PCF, SMF, UDM, UPF, AF, UE, (R)AN, SCP (Service Communication Proxy), NSSAAF (Network Slice-Specific Authentication and Authorization Function), etc.

[0087] According to an example embodiment, the UE may establish a signaling connection with the AMF over reference point N1 as shown in Figure 2. This signaling connection may enable exchange of non-access stratum (NAS) signaling between the UE and the core network, including a signaling connection between the UE and the (R)AN and an N2 connection between the (R)AN and the AMF for the UE. The (R)AN may communicate with the UPF over reference point N3. The UE may establish a protocol data unit (PDU) session to a DN (data network, e.g., an operator network or the Internet) through the UPF over reference point N6.

[0088] As further illustrated in Figure 2, the exemplary system architecture also includes service-based interfaces, such as Nnrf, Nnef, Nausf, Nudm, Npcf, Namf, and Nsmf, exposed by NFs, such as NRF, NEF, AUSF, UDM, PCF, AMF, and SMF. In addition, Figure 2 also illustrates several reference points, such as N1, N2, N3, N4, N6, and N9, that can support interactions between NF services in the NFs. For example, the reference points can be realized by identifying several NF service consumers and providers and their interactions through the service-based interfaces of the corresponding NFs for the purpose of performing specific system procedures.

[0089] The various NFs shown in Figure 2 may be responsible for functions such as session management, mobility management, authentication, security, etc. The AUSF, AMF, DN, NEF, NRF, NSSF, PCF, SMF, UDM, UPF, AF, UE, (R)AN, and SCP may include functionality as defined, for example, in section 6.2 of 3GPP TS23.501V16.5.1.

[0090] FIG. 3 illustrates a schematic diagram of a system architecture in a 4G network according to one embodiment of the present disclosure, which is identical to FIG. 4.2-1a of 3GPP TS 23.682 V16.8.0, the disclosure of which is hereby incorporated by reference in its entirety. The system architecture of FIG. 3 may include several example elements, such as a Service Capability Server (SCS), an Application Server (AS), a Service Capability Exposure Function (SCEF), an HSS, a UE, a Radio Access Network (RAN), a Serving General Packet Radio Service (GPRS) Support Node (SGSN), an MME, a Mobile Switching Center (MSC), a Serving Gateway (S-GW), a Gateway GPRS Support Node / Packet Data Network (PDN) Gateway (GGSN / P-GW), a Machine Type Communications Interworking Function (MTC-IWF), a Charging Data Function / Charging Gateway Function (CDF / CGF), a Machine Type Communications-Authentication, Authorization, and Accounting (MTC-AAA), a Short Message Service-Service Center / Gateway MSC / Interworking MSC (SMS-SC / GMSC / IWMSC), and an Internet Protocol Short Message Gateway (IP-SM-GW). The network elements and interfaces as shown in FIG. 3 may be identical to the corresponding network elements and interfaces as described in 3GPP TS23.682V16.8.0.

[0091] 4 illustrates a flowchart of a method according to one embodiment of the present disclosure that may be performed by a device implemented in, at, or as the first network function, or a device communicatively coupled to the first network function, such that the device may provide means or modules for accomplishing various parts of the method 400, as well as means or modules for accomplishing other processes in conjunction with other components.

[0092] At block 402, a first network function may send a first request to a second network function requesting to receive at least one registration data set for a service intended for a user equipment (UE).

[0093] The first network function may be any suitable NF that may request to receive at least one registration data set for a service for the UE from the second network function, for example, the first network function may include at least one of an SMS-GMSC, an IP-SM-GW, an SMS router, a Service Capability Exposure Function (SCEF), an AMF, an SMF, an SMSF, an NEF, a Gateway Mobile Location Centre (GMLC), an NWDAF, an HSS, a home location register (HLR), and an AUSF.

[0094] In one embodiment, the first network function may include at least one of an SMS-GMSC, an IP-SM-GW, an SMS router, a SCEF, or a NEF.

[0095] The second network function may be any suitable NF capable of storing or retrieving from another NF at least one registration data set for services for the UE, for example, the second network function may include any suitable data management entity or data storage entity.

[0096] In one embodiment, the second network function may include at least one of a unified data management (UDM), a home subscriber server (HSS), or a home location register (HLR).

[0097] The second NF may provide various services to the first NF. For example, the second NF may provide at least one of a subscriber data management service, a UE context management service, a UE authentication service, an event exposure service, a parameter provisioning service, etc.

[0098] At block 404, the first network function may receive a first response from the second network function.

[0099] In one embodiment, if there is an error related to the UE's routing for the service, the first response includes a status code indicating an error related to the UE's routing for the service. If the first NF receives the status code from the second NF, it may know that the second NF has obtained at least one registration data set for the service for the UE, but there is an error related to the UE's routing for the service. In other words, the first NF knows that the service, such as SMS, is not reachable by the UE. Thus, the first NF may take some appropriate action based on knowledge of the status code.

[0100] In one embodiment, if there is no error associated with the UE's routing for the service, the first response includes at least one registration data set for the service for the UE. If the first NF receives at least one registration data set for the service for the UE, it may know that there is no error associated with the UE's routing for that service. In other words, the first NF knows that the service, such as SMS, is reachable by the UE. Thus, the first NF may take some appropriate action based on the knowledge of at least one registration data set for the service for the UE.

[0101] Errors related to the routing of the UE for the above service may be determined by 2NF.

[0102] In other embodiments, if the second NF is unable to obtain at least one registration data set for the service for the UE (e.g., no corresponding context exists) or the UE is not found, the first response may include a status code indicating CONTEXT_NOT_FOUND or USER_NOT_FOUND as the error.

[0103] The status code may be any suitable status code. In one embodiment, the status code indicating an error related to the UE's routing for the service includes at least one of a HyperText Transfer Protocol (HTTP) status code '403 Forbidden' with a cause attribute used to indicate an error related to the UE's routing for the service, or a HTTP status code '404 Not Found' with a cause attribute used to indicate an error related to the UE's routing for the service.

[0104] The cause attribute used to indicate an error related to the UE's routing for the service may be any suitable cause attribute, such as "ABSNET_SUBSCRIBER_SM", "SUBSERVICE_BARRED", "SUBSERVICE_NOT_PROVISIONED", etc. For example, if the service is SMS and the sub-service is MT SMS, the cause attribute used to indicate an error related to the UE's routing for the service may be "ABSNET_SUBSCRIBER_SM", "MTSMS_BARRED", "MTSMS_NOT_PROVISIONED".

[0105] In one embodiment, the error related to the routing of the UE for the service includes at least one of: the UE subscribes to the service but a subservice of the service is prohibited, the UE subscribes to the service but a subservice of the service is not provided, or the UE subscribes to the service but the UE is not reachable from the service.

[0106] In one embodiment, the subservice of the service includes at least one of a mobile terminated service or a mobile originated service.

[0107] In one embodiment, the service includes a short message service.

[0108] In one embodiment, the at least one registration data set for services for the UE includes at least one of Short Message Service Function (SMSF) registration information of the UE for Third Generation Partnership Project (3GPP) access or SMSF registration information of the UE for non-3GPP access.

[0109] In one embodiment, the first request is an HTTP GET request and the first response is an HTTP GET response.

[0110] In block 406, optionally, the first network function may send a second request to a second network function if the error related to the UE's routing for the service indicates that the UE is subscribed to the service but the UE is not reachable from the service. The second request requests the service function to alert when the UE is reachable from the service. After receiving an alert message indicating that the UE is reachable from the service, the service function may take any suitable action based on the alert, such as, for example, resending a pending SMS.

[0111] 5 shows a flowchart of a method according to another embodiment of the present disclosure that may be performed by a device implemented in, at, or as a second network function, or a device communicatively coupled to the second network function. Thus, the device may provide means or modules for accomplishing various parts of the method 500 as well as means or modules for accomplishing other processes in cooperation with other components. Descriptions of some parts described in the above embodiments are omitted here for clarity.

[0112] In block 502, the second network function may receive a first request from the first network function requesting to receive at least one registration data set for a service for a user equipment (UE). For example, the first NF may send the first request to the second NF in block 402 of FIG. 4 and the second NF may receive the first request.

[0113] The second network function may determine whether there is an error associated with the routing of the UE for the service in block 504. The second network function may determine whether there is an error associated with the routing of the UE for the service in a variety of manners.

[0114] In one embodiment, the second network function may determine whether there is an error related to the UE's routing for the service by: obtaining subscription data for the service of the UE, the subscription data including subscription information regarding whether the UE subscribes to the service; obtaining administrative subscription data for the service of the UE, the administrative subscription data including subscription information regarding whether the UE subscribes to sub-services of the service and / or barring control policies; and determining whether there is an error related to the UE's routing for the service based on the subscription data for the service of the UE and the administrative subscription data for the service of the UE.

[0115] For example, the second network function may obtain service subscription data for the UE. The UE's service subscription data includes subscription information regarding whether the UE subscribes to a service. The second network function may obtain the UE's service subscription data from a local storage if the UE's service subscription data is stored in the local storage. The second network function may obtain the UE's service subscription data from another network function if the UE's service subscription data is stored in the other network function.

[0116] The second network function may obtain administrative subscription data for the service of the UE. The administrative subscription data for the service of the UE may include subscription information regarding whether the UE subscribes to a sub-service of the service and / or a barring control policy. The second network function may obtain the administrative subscription data for the service of the UE from a local storage if the administrative subscription data for the service of the UE is stored in the local storage. The second network function may obtain the administrative subscription data for the service of the UE from another network function if the administrative subscription data for the service of the UE is stored in the other network function.

[0117] In one embodiment, at least one of the UE's service subscription data and the UE's service administration subscription data may be obtained from a Unified Data Repository (UDR).

[0118] The 2NF may determine whether there is an error related to the UE's routing for the service based on the subscription data of the service of the UE and the administration subscription data of the service of the UE. For example, if a barring condition of a subservice of the service is met, e.g., if the UE has subscribed to SMS and MT-SMS is barred for the registered visited PLMN or for all PLMNs, an HTTP 403 error response may be returned with CAUSE:MTSMS_BARRED, which is indicated in the problem details of the HTTP 403 error response. For example, if a subservice of the service is not provided, e.g., if the UE has subscribed to SMS but MT-SMS is not provided, an HTTP 403 error response may be returned with CAUSE:MTSMS_NOT_PROVISIONED, which is indicated in the problem details of the HTTP 403 error response.

[0119] In one embodiment, the 2NF may determine whether there is an error related to the UE's routing for a service by obtaining registration data of a capability of the service for the UE, obtaining standby status data of the service for the UE, the standby status data including information regarding whether the service is reachable by the UE, and determining whether there is an error related to the UE's routing for the service based on the registration data of the capability of the service for the UE and the standby status data of the service for the UE.

[0120] For example, the second network function may obtain registration data of the functions of the service for the UE. The second network function may obtain the registration data of the functions of the service for the UE from a local storage when the registration data of the functions of the service for the UE is stored in the local storage. The second network function may obtain the registration data of the functions of the service for the UE from another network function when the registration data of the functions of the service for the UE is stored in the other network function.

[0121] The second network function may obtain waiting status data of a service for the UE. The waiting status data of the service for the UE includes information regarding whether the service is reachable by the UE. The second network function may obtain the waiting status data of the service for the UE from the local storage if the waiting status data of the service for the UE is stored in the local storage. The second network function may obtain the waiting status data of the service for the UE from another network function if the waiting status data of the service for the UE is stored in the other network function.

[0122] In one embodiment, at least one of the registration data of the capabilities of the service for the UE and the queued status data of the service for the UE is obtained from the UDR.

[0123] Based on the registration data of the capabilities of the service for the UE and the queued status data of the service for the UE, the second NF may determine whether there is an error related to the routing of the UE for the service. For example, if a subscriber absent condition is met for short messages (SM), e.g., the UE has a registered SMSF for 3GPP access, and the SMS queued status data indicates that the UE is not SMS reachable, an HTTP 404 error response is returned with CAUSE: ABSENT_SUBSCRIBER_SM, which is indicated in the problem details of the HTTP 404 error response. Based on the new cause code ABSENT_SUBSCRIBER_SM, the NF service consumer (e.g., the first NF) may further request the UDM to add a service center (SC) address to the SMS queued data list. So, once the UE is SMS reachable, the UDM will be able to alert the SC for retransmission of the pending SMS.

[0124] At block 506, the second network function may send the first response to the first network function.

[0125] In one embodiment, if there is an error related to the routing of the UE for the service, the first response includes a status code indicating the error related to the routing of the UE for the service.

[0126] In one embodiment, if there is no error associated with routing of the UE for the service, the first response includes at least one registration data set for the service for the UE.

[0127] 6 shows a flowchart of a method according to another embodiment of the present disclosure that may be performed by a device implemented in, at, or as a second network function, or a device communicatively coupled to the second network function. Thus, the device may provide means or modules for accomplishing various parts of the method 600, as well as means or modules for accomplishing other processes in cooperation with other components. Descriptions of some parts described in the above embodiments are omitted here for clarity.

[0128] At block 602, if an error associated with routing of the UE for the service indicates that the UE is subscribed to the service but the UE is not reachable from the service, the second network function may receive a second request from the first network function requesting to alert the function of the service when the UE is reachable from the service.

[0129] At block 604, the second network function may send an alert message indicating that the UE is reachable to a service function, which in one embodiment may include at least one of an SMS-GMSC, an IP-SM-GW, or an SMS router.

[0130] FIG. 7 illustrates a flow chart for obtaining SMSF registration data for 3GPP access according to one embodiment of the present disclosure.

[0131] In step 701, an NF service consumer, such as an NEF, sends a GET request (such as an HTTP GET) to a resource representing the UE's registration information for 3GPP access.

[0132] The UDM is first extended to perform the step of SMS subscription check by obtaining the SMS subscription data and SMS management subscription data of the UE from the UDR, corresponding to steps 702 and 703.

[0133] In step 702, the UDM may query the UDR to obtain SMS subscription data for the UE. The SMS subscription data may include subscriptions regarding whether the UE (or a user of the UE) has subscribed to SMS.

[0134] In step 703, the UDM may query the UDR to obtain SMS management subscription data for the UE, which may include the UE's (or the user of the UE's) subscriptions for MO-SMS and MT-SMS and barring control policies.

[0135] In step 704, if a call barring condition is met, e.g. the UE has subscribed to SMS and MT-SMS is barred for the registered visited PLMN or for all PLMNs, an HTTP 403 error response is returned indicating CAUSE:MTSMS_BARRED in the problemDetails of the HTTP 403 error response.

[0136] In step 705, if the remote service non-provision condition is met, for example if the UE has subscribed to SMS and MT-SMS is not provided, an HTTP 403 error response is returned indicating CAUSE:MTSMS_NOT_PROVISIONED in the problemDetails of the HTTP 403 error response.

[0137] The UDM is then extended to perform the steps of SMS registration check and queue status check by obtaining the UE's SMSF registration data and SMS queue status data from the UDR, corresponding to steps 706 and 707.

[0138] In step 706, the UDM may query the UDR to obtain the UE's SMSF registration data for 3GPP access.

[0139] In step 707, the UDM may query the UDR to obtain SMS pending status data of the UE, which may indicate whether the UE is SMS reachable.

[0140] In step 708, if an absent subscriber condition is met for SM, e.g. the UE has a registered SMSF for 3GPP access and the SMS waiting status data indicates that the UE is not SMS reachable, then an HTTP 404 error response is returned indicating CAUSE:ABSENT_SUBSCRIBER_SM in the problemDetails of the HTTP 404 error response.

[0141] Based on the new cause code ABSENT_SUBSCRIBER_SM, the NF service consumer may further request the UDM to add the SC address to the SMS waiting list, so that once the UE becomes SMS reachable, the UDM will be able to alert the SC about retransmission of the pending SMS.

[0142] In step 709, if the normal response conditions are met, e.g., the UE has a registered SMSF for 3GPP access and the SMS waiting status data indicates that the UE is SMS reachable, then an HTTP 200 OK response is returned with the SMSF registration data for 3GPP access.

[0143] The above mentioned cause codes MTSMS_BARRED, MTSMS_NOT_PROVISIONED or ABSENT_SUBSCRIBER_SM are not supported in the 3GPP protocol as described in 3GPP TS29.503V17.1.0, therefore the proposed embodiment allows to extend the 3GPP protocol to indicate such conditions to the NF service consumer.

[0144] In one embodiment, Table 6.2.3.6.3.3-3 of 3GPP TS29.503V17.1.0 may be modified as follows: [Table 7]

[0145] FIG. 8 illustrates a flow chart for obtaining SMSF registration data for non-3GPP access according to one embodiment of the present disclosure.

[0146] In step 801, a NF service consumer, such as a NEF, sends a GET request (such as an HTTP GET) to a resource representing the registration information of a UE for non-3GPP access.

[0147] The UDM is first extended to perform the step of SMS subscription check by obtaining the SMS subscription data and SMS management subscription data of the UE from the UDR, corresponding to steps 802 and 803.

[0148] In step 802, the UDM may query the UDR to obtain SMS subscription data for the UE. The SMS subscription data may include subscriptions regarding whether the UE (or a user of the UE) has subscribed to SMS.

[0149] In step 803, the UDM may query the UDR to obtain SMS management subscription data for the UE. The SMS management subscription data may include the UE's (or the user of the UE's) subscriptions for MO-SMS and MT-SMS and barring control policies.

[0150] In step 804, if a call barring condition is met, e.g. the UE has subscribed to SMS and MT-SMS is barred for the registered visited PLMN or for all PLMNs, an HTTP 403 error response is returned indicating CAUSE:MTSMS_BARRED in the problemDetails of the HTTP 403 error response.

[0151] In step 805, if the remote service non-provision condition is met, for example if the UE has subscribed to SMS and MT-SMS is not provided, an HTTP 403 error response is returned and indicates CAUSE:MTSMS_NOT_PROVISIONED in the problemDetails of the HTTP 403 error response.

[0152] The UDM is then extended to perform the steps of SMS registration check and queue status check by obtaining the UE's SMSF registration data and SMS queue status data from the UDR, corresponding to steps 806 and 807.

[0153] In step 806, the UDM may query the UDR to obtain SMSF registration data of the UE for non-3GPP access.

[0154] In step 807, the UDM may query the UDR to obtain SMS pending status data of the UE. The SMS pending status data may indicate whether the UE is SMS reachable.

[0155] In step 808, if an absent subscriber condition is met for SM, e.g. the UE has a registered SMSF for 3GPP access and the SMS waiting status data indicates that the UE is not SMS reachable, then an HTTP 404 error response is returned indicating CAUSE:ABSENT_SUBSCRIBER_SM in the problemDetails of the HTTP 404 error response.

[0156] Based on the new cause code ABSENT_SUBSCRIBER_SM, the NF service consumer may further request the UDM to add the SC address to the SMS waiting list, so that once the UE becomes SMS reachable, the UDM will be able to alert the SC about retransmission of the pending SMS.

[0157] In step 809, if the normal response conditions are met, e.g., the UE has a registered SMSF for non-3GPP access and the SMS waiting status data indicates that the UE is SMS reachable, then an HTTP 200 OK response is returned with the SMSF registration data for non-3GPP access.

[0158] The above mentioned cause codes MTSMS_BARRED, MTSMS_NOT_PROVISIONED or ABSENT_SUBSCRIBER_SM are not supported in the 3GPP protocol as described in 3GPP TS29.503V17.1.0, therefore the proposed embodiment allows to extend the 3GPP protocol to indicate such conditions to the NF service consumer.

[0159] In one embodiment, Table 6.2.3.7.3.3-3 of 3GPP TS29.503V17.1.0 may be modified as follows: [Table 8]

[0160] FIG. 9 illustrates a flowchart for obtaining SMSF registration data for non-3GPP access and SMSF registration data for 3GPP access according to one embodiment of the present disclosure.

[0161] In step 901, an NF service consumer, such as an NEF, sends a GET request (such as an HTTP GET) to a resource representing the registration information of a UE with a query parameter of registration-data-names for SMSFs for both 3GPP access and non-3GPP access.

[0162] The UDM is first extended to perform the step of SMS subscription check by obtaining the SMS subscription data and SMS management subscription data of the UE from the UDR, corresponding to steps 902 and 903.

[0163] In step 902, the UDM may query the UDR to obtain SMS subscription data for the UE. The SMS subscription data may include subscriptions regarding whether the UE (or a user of the UE) has subscribed to SMS.

[0164] In step 903, the UDM may query the UDR to obtain SMS management subscription data for the UE. The SMS management subscription data may include the UE's (or the user of the UE's) subscriptions for MO-SMS and MT-SMS and barring control policies.

[0165] In step 904, if a call barring condition is met, e.g. the UE has subscribed to SMS and MT-SMS is barred for the registered visited PLMN or for all PLMNs, an HTTP 403 error response is returned indicating CAUSE:MTSMS_BARRED in the problemDetails of the HTTP 403 error response.

[0166] In step 905, if the remote service non-provision condition is met, for example if the UE has subscribed to SMS and MT-SMS is not provided, an HTTP 403 error response is returned and indicates CAUSE:MTSMS_NOT_PROVISIONED in the problemDetails of the HTTP 403 error response.

[0167] The UDM is then extended to perform the steps of SMS registration check and queue status check by obtaining the UE's SMSF registration data and SMS queue status data from the UDR, corresponding to steps 906, 907 and 908.

[0168] In step 906, the UDM may query the UDR to obtain the UE's SMSF registration data for 3GPP access.

[0169] In step 907, the UDM may query the UDR to obtain SMSF registration data of the UE for non-3GPP access.

[0170] In another embodiment, steps 906 and 907 may be a single GET operation on the UDR to obtain both the SMSF registration data for 3GPP access and the SMSF registration data for non-3GPP access.

[0171] In step 908, the UDM may query the UDR to obtain SMS pending status data of the UE. The SMS pending status data may indicate whether the UE is SMS reachable.

[0172] In step 909, if an absent subscriber condition is met for SM, e.g. the UE has a registered SMSF for non-3GPP access and / or 3GPP access and the SMS waiting status data indicates that the UE is not SMS reachable, an HTTP 404 error response is returned with CAUSE:ABSENT_SUBSCRIBER_SM indicated in the problemDetails of the HTTP 404 error response.

[0173] Based on the new cause code ABSENT_SUBSCRIBER_SM, the NF service consumer may further request the UDM to add the SC address to the SMS waiting list, so that once the UE is SMS reachable, the UDM will be able to alert the SC about retransmission of the pending SMS.

[0174] In step 910, if the normal response conditions are met, e.g. the UE has a registered SMSF for 3GPP access and / or a registered SMSF for non-3GPP access and the SMS waiting status data indicates that the UE is reachable by SMS, an HTTP 200 OK response is returned with the SMSF registration data for 3GPP access and the SMSF registration data for non-3GPP access, or with one of them when the SMS waiting status data indicates that the UE is reachable for either 3GPP access or non-3GPP access.

[0175] The above mentioned cause codes MTSMS_BARRED, MTSMS_NOT_PROVISIONED or ABSENT_SUBSCRIBER_SM are not supported in the 3GPP protocol as described in 3GPP TS29.503V17.1.0, therefore the proposed embodiment allows to extend the 3GPP protocol to indicate such conditions to the NF service consumer.

[0176] In one embodiment, Table 6.2.3.9.3.1-3 of 3GPP TS29.503V17.1.0 may be modified as follows: [Table 9]

[0177] In one embodiment, Table 6.2.7.3-1 of 3GPP TS29.503V17.1.0 may be modified as follows: [Table 10]

[0178] In one embodiment, the proposed solution may extend the cause codes (e.g. HTTP status codes) for the interface that GETs SMSF registration information as SMS routing information: 403, CAUSE: MTSMS_BARRED for cases where the UE has an SMS subscription but MT-SMS is barred for all or some of the registered visited PLMNs. - 403, CAUSE: MTSMS_NOT_PROVISIONED for cases where the UE has SMS subscription but MT-SMS is not provided 404, CAUSE: ABSENT_SUBSCRIBER_SM for cases where the SMS waiting data indicates that the UE has an SMS subscribed but the UE is not SMS reachable.

[0179] Embodiments herein may provide many advantages, a non-exhaustive list of examples of which follows: In some embodiments herein, the second network function may send a precise status code to the first network function indicating an error related to the UE's routing for the service. For example, for an SMS routing information request, a precise cause such as ABSENT_SUBSCRIBER_SM, MTSMS_BARRED, MTSMS_NOT_PROVISIONED may be sent to the UDM UECM GET service consumer. In some embodiments herein, the NF consumer may differentiate between error conditions. In some embodiments herein, the proposed solution may avoid unnecessary signaling when the UE is not reachable for a service, such as SMS. In some embodiments herein, the first network function may request the second network function to alert the service function when the UE is reachable for the service. For example, the service consumer could ask the UDM to add the SC address to the SMS waiting data list. Once the UE is reachable for the SMS, the UDM could alert the SC for pending SMS retransmissions. Some embodiments herein may optimize services such as SMS delivery. The embodiments herein are not limited to the features and advantages mentioned above. Those skilled in the art will recognize additional features and advantages after reading the following detailed description.

[0180] 10 is a block diagram illustrating an apparatus suitable for implementing some embodiments of the present disclosure. For example, any one of the first network function and the second network function may be implemented as or through the apparatus 1000.

[0181] The device 1000 comprises at least one processor 1021, such as a digital processor (DP), and at least one memory (MEM) 1022 coupled to the processor 1021. The device 1020 may further comprise a transmitter TX and a receiver RX 1023 coupled to the processor 1021. The MEM 1022 stores a program (PROG) 1024. The PROG 1024 may include instructions that, when executed on the associated processor 1021, enable the device 1020 to operate according to an embodiment of the present disclosure. The combination of the at least one processor 1021 and the at least one MEM 1022 may form a processing means 1025 adapted to implement various embodiments of the present disclosure.

[0182] Various embodiments of the present disclosure may be implemented in a computer program executable by one or more of the processors 1021, software, firmware, hardware, or a combination thereof.

[0183] MEM1022 may be of any type suitable for the local technology environment and may be implemented using any suitable data storage technology, such as, by way of non-limiting example, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed and removable memory.

[0184] The processor 1021 may be of any type suitable for the local technology environment, and may include, by way of non-limiting examples, one or more of a general purpose computer, a special purpose computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture.

[0185] In an embodiment in which the above device is implemented as a first network function, the memory 1022 contains a set of instructions executable by the processor 1021, thereby causing the first network function to operate according to any step of the method as described above relating to the first network function.

[0186] In an embodiment in which the above device is implemented as a second network function, the memory 1022 contains a set of instructions executable by the processor 1021, thereby causing the second network function to operate according to any step of the method as described above relating to the second network function.

[0187] FIG. 11 is a block diagram illustrating a first network function according to an embodiment of the present disclosure. As illustrated, the first network function 1100 includes a first sending module 1101 and a receiving module 1102. The first sending module 1101 may be configured to send a first request to a second network function. The first request is for receiving at least one registration data set for a service for a user equipment (UE). The receiving module 1102 may be configured to receive a first response from the second network function. If there is an error related to the UE's routing for the service, the first response includes a status code indicating an error related to the UE's routing for the service. If there is no error related to the UE's routing for the service, the first response includes at least one registration data set for the service for the UE.

[0188] In one embodiment, the first network function 1100 may further comprise a second sending module 1103 configured to send a second request to a second network function when an error related to the UE's routing for the service indicates that the UE is not reachable from the service even though the UE has subscribed to the service, the second request requesting to alert the function of the service when the UE is reachable from the service.

[0189] FIG. 12 is a block diagram illustrating a second network function according to an embodiment of the present disclosure. As illustrated, the second network function 1200 includes a first receiving module 1201, a determining module 1202, and a first sending module 1203. The first receiving module 1201 may be configured to receive a first request from the first network function. The first request is for receiving at least one registration data set for a service for a user equipment (UE). The determining module 1202 may be configured to determine whether there is an error related to the UE's routing for the service. The first sending module 1203 may be configured to send a first response to the first network function. If there is an error related to the UE's routing for the service, the first response includes a status code indicating an error related to the UE's routing for the service. If there is no error related to the UE's routing for the service, the first response includes at least one registration data set for the service for the UE.

[0190] In one embodiment, the second network function 1200 may further comprise a second receiving module 1204 configured to receive a second request from the first network function when an error related to the UE's routing for the service indicates that the UE is not reachable from the service even though the UE has subscribed to the service, the second request requesting to alert the function of the service when the UE is reachable from the service.

[0191] In one embodiment, the second network function 1200 may further comprise a second sending module 1205 for sending an alert message to the function of the service indicating that the UE is reachable to the service.

[0192] The terms unit or module may have their conventional meaning in the field of electronic equipment, electrical devices, and / or electronic devices, and may include, for example, electrical and / or electronic circuits, devices, modules, processors, memories, logic solid-state and / or discrete devices, computer programs, or instructions for performing a respective task, procedure, computation, output and / or display function, etc., such as those described herein.

[0193] Regarding the functional unit group, the first network function and the second network function may not require fixed processors or memories, and any computing resources and storage resources may be configured from the first network function and the second network function in the communication system. The introduction of virtualization technology and network computing technology may improve the utilization efficiency of network resources and the flexibility of the network.

[0194] According to one aspect of the present disclosure, there is provided a computer program product tangibly stored on a computer-readable storage medium, the computer program product including instructions that, when executed on at least one processor, cause the at least one processor to perform any of the methods as set forth above.

[0195] According to one aspect of the present disclosure, a computer-readable storage medium is provided that stores instructions that, when executed by at least one processor, cause the at least one processor to perform any of the methods described above.

[0196] Additionally, the present disclosure may also provide a carrier carrying a computer program as described above, the carrier being one of an electronic signal, an optical signal, a radio signal, or a computer-readable storage medium, which may be, for example, a random access memory (RAM), a read only memory (ROM), a flash memory, a magnetic tape, an optical compact disc, or an electronic memory device, such as a CD-ROM, a DVD, or a Blu-ray disc.

[0197] The techniques described herein may be implemented by a variety of means, such that an apparatus implementing one or more functions of a corresponding apparatus described in conjunction with an embodiment includes not only conventional means, but also means for implementing one or more functions of the corresponding apparatus described in conjunction with the embodiment, which may include separate means for each separate function, or means that may be configured to perform more than one function. For example, the techniques may be implemented in hardware (one or more devices), firmware (one or more devices), software (one or more modules), or a combination thereof. For firmware or software, the implementation may be through modules (e.g., procedures, functions, etc.) that perform the functions described herein.

[0198] The exemplary embodiments herein have been described above with reference to block diagrams and flowchart illustrations of methods and apparatus. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can each be implemented by various means including computer program instructions that can be loaded into a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine whereby the instructions running on the computer or other programmable data processing apparatus generate means for implementing the functions identified in one or more blocks of the flowchart.

[0199] Furthermore, although acts are depicted in a particular order, it should not be understood as requiring that such acts be performed in that particular order or in sequential order, or that all of the acts depicted be performed, to achieve desired results. In some situations, multitasking and parallel processing may be advantageous. Similarly, while the above discussion includes a number of specific implementation details, these should not be construed as limitations on the scope of the subject matter described herein, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may be implemented in multiple embodiments separately or in any suitable subcombination.

[0200] Although the specification contains many specific implementation details, they should not be construed as limitations on the scope of any implementation or what may be claimed, but rather as descriptions of features that may be specific to a particular embodiment of a particular implementation. Features described in the specification in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable subcombination. Moreover, although features may be described above as operating in a combination and even claimed as such, in some cases, one or more features of a claimed combination may be separated from the combination, and the claimed combination may be directed to a subcombination or a variation of the subcombination.

[0201] It is obvious to those skilled in the art that the concept of the present invention can be implemented in various ways with the development of technology. The above-mentioned embodiments are given to illustrate rather than limit the present disclosure, and it will be understood that those skilled in the art can easily understand that modifications and variations can be made without departing from the spirit and scope of the present disclosure. Such modifications and variations are considered to be within the scope of the present disclosure and the appended claims. The scope of protection of the present disclosure is defined by the appended claims.

Claims

1. A method (400) performed by a first network function, comprising: Sending (402) a first request to a second network function, the first request requesting to receive at least one registration data set for a service intended for a user equipment (UE); receiving (404) a first response from the second network function; If there is an error related to the routing of the UE for the service, the first response includes a status code indicating the error related to the routing of the UE for the service; If there is no error related to the routing of the UE for the service, the first response includes the at least one registration data set for the service for the UE; The error relating to the routing of the UE for the service: the UE has subscribed to the service but a sub-service of the service is prohibited; The UE subscribes to the service but a sub-service of the service is not provided; or the UE has subscribed to the service but the UE is not reachable from the service; The method includes at least one of the following:

2. 2. The method of claim 1, wherein the status code indicating an error related to the UE's routing for the service comprises: A HyperText Transfer Protocol (HTTP) status code '403 Forbidden' with a cause attribute used to indicate the error related to the UE's routing for the service; or '404 Not Found', an HTTP status code with a cause attribute used to indicate the error related to the UE's routing for the service; The method of claim 1, further comprising at least one of:

3. 2. The method of claim 1, wherein the sub-service of the service comprises: Mobile-terminated services, or Mobile-originated services, The method of claim 1, further comprising at least one of:

4. The method according to any one of claims 1 to 3, wherein the service comprises a short message service.

5. 5. The method according to claim 1, wherein the at least one registration data set for the service for the UE comprises: Short Message Service Function (SMSF) registration information of the UE for Third Generation Partnership Project (3GPP) access; or SMSF registration information of the UE for non-3GPP access; The method of claim 1, further comprising at least one of:

6. The method according to any one of claims 1 to 5, further comprising: sending (406) a second request to the second network function if the error related to the UE's routing for the service indicates that the UE has subscribed to the service but the UE is not reachable from the service, the second request requesting to alert the service function when the UE is reachable from the service; A method comprising:

7. The method according to any one of claims 1 to 6, wherein the first network function comprises: Short Message Service-Gateway Mobile Switching Center (SMS-GMSC); Internet Protocol-Short Message-Gateway (IP-SM-GW); SMS router, Service Capability Exposure Function (SCEF), or Network Exposure Function (NEF), The method includes at least one of the following:

8. The method according to any one of claims 1 to 7, wherein the second network function comprises: Unified Data Management (UDM), A Home Subscriber Server (HSS), or Home Location Register (HLR), The method includes at least one of the following:

9. The method of any one of claims 1 to 8, wherein the first request is an HTTP GET request and the first response is an HTTP GET response.

10. A method (500) performed by a second network function, comprising: Receiving (502) a first request from a first network function, the first request requesting to receive at least one registration data set for a service intended for a user equipment (UE); determining (504) whether there is an error associated with the routing of the UE for the service; and sending (506) a first response to the first network function; If there is an error related to the routing of the UE for the service, the first response includes a status code indicating the error related to the routing of the UE for the service; If there is no error related to the routing of the UE for the service, the first response includes the at least one registration data set for the service for the UE; The error relating to the routing of the UE for the service: the UE has subscribed to the service but a sub-service of the service is prohibited; The UE subscribes to the service but a sub-service of the service is not provided; or the UE has subscribed to the service but the UE is not reachable from the service; The method includes at least one of the following:

11. 11. The method of claim 10, wherein the status code indicating an error related to the routing of the UE for the service comprises: A HyperText Transfer Protocol (HTTP) status code '403 Forbidden' with a cause attribute used to indicate the error related to the UE's routing for the service; or '404 Not Found', an HTTP status code with a cause attribute used to indicate the error related to the UE's routing for the service; The method of claim 1, further comprising at least one of:

12. 11. The method of claim 10, wherein the sub-service of the service comprises: Mobile-terminated services, or Mobile-originated services, The method of claim 1, further comprising at least one of:

13. The method according to any one of claims 10 to 12, wherein the service comprises a short message service.

14. 14. The method according to claim 10, wherein the at least one registration data set for the service for the UE comprises: Short Message Service Function (SMSF) registration information of the UE for Third Generation Partnership Project (3GPP) access; or SMSF registration information of the UE for non-3GPP access; The method of claim 1, further comprising at least one of:

15. The method according to any one of claims 10 to 14, further comprising: receiving (602) a second request from the first network function when the error related to the UE's routing for the service indicates that the UE has subscribed to the service but the UE is not reachable from the service, the second request requesting to alert the service function when the UE is reachable from the service; sending (604) an alert message to the function of the service indicating that the UE is reachable by the service; A method comprising:

16. The method according to any one of claims 10 to 15, wherein the first network function comprises: Short Message Service-Gateway Mobile Switching Center (SMS-GMSC); Internet Protocol-Short Message-Gateway (IP-SM-GW); SMS router, Service Capability Exposure Function (SCEF), or Network Exposure Function (NEF), The method includes at least one of the following:

17. The method according to any one of claims 10 to 16, wherein the second network function comprises: Unified Data Management (UDM), A Home Subscriber Server (HSS), or Home Location Register (HLR), The method includes at least one of the following:

18. The method of any one of claims 10 to 17, wherein the first request is an HTTP GET request and the first response is an HTTP GET response.

19. 19. The method according to claim 10, wherein determining whether there is an error related to the routing of the UE for the service comprises: obtaining subscription data of the service of the UE, the subscription data of the service of the UE including subscription information regarding whether the UE subscribes to the service; Obtaining administrative subscription data of the service of the UE, the administrative subscription data of the service of the UE including subscription information regarding whether the UE subscribes to a sub-service of the service and / or a barring control policy; determining whether there is an error associated with routing of the UE for the service based on the subscription data of the service of the UE and the administrative subscription data of the service of the UE.

20. 20. The method of claim 19, wherein at least one of the subscription data for the services of the UE and the administrative subscription data for the services of the UE is obtained from a Uniform Data Repository (UDR).

21. 21. The method according to claim 10, wherein determining whether there is an error related to the routing of the UE for the service comprises: obtaining registration data of capabilities of the service for the UE; obtaining standby status data of the service for the UE, the standby status data of the service for the UE including information on whether the UE is able to reach the service; determining whether there is an error associated with routing of the UE for the service based on the registration data of the capabilities of the service for the UE and the standby status data of the service for the UE.

22. 22. The method of claim 21, wherein at least one of the registration data of the capabilities of the service for the UE and the standby status data of the service for the UE is obtained from a UDR.

23. A first network function (1000), A processor (1021); and a memory (1022) coupled to said processor (1021), said memory (1022) including instructions executable by said processor (1021), such that said first network function (1000) sending a first request to a second network function, the first request requesting to receive at least one registration data set for a service intended for a user equipment (UE); receiving a first response from the second network function; and operable to If there is an error related to the routing of the UE for the service, the first response includes a status code indicating the error related to the routing of the UE for the service; If there is no error related to the routing of the UE for the service, the first response includes the at least one registration data set for the service for the UE; The error relating to the routing of the UE for the service: the UE has subscribed to the service but a sub-service of the service is prohibited; The UE subscribes to the service but a sub-service of the service is not provided; or the UE has subscribed to the service but the UE is not reachable from the service; A first network function including at least one of:

24. A first network function according to claim 23, wherein said first network function is further operable to perform a method according to any one of claims 2 to 9.

25. A second network function (1000), A processor (1021); and a memory (1022) coupled to said processor (1021), said memory (1022) including instructions executable by said processor (1021), whereby said second network function (1000) receiving a first request from a first network function, the first request requesting to receive at least one registration data set for a service intended for a user equipment (UE); determining whether there is an error associated with the routing of the UE for the service; sending a first response to the first network function; and operable to If there is an error related to the routing of the UE for the service, the first response includes a status code indicating the error related to the routing of the UE for the service; If there is no error related to the routing of the UE for the service, the first response includes the at least one registration data set for the service for the UE; The error relating to the routing of the UE for the service: the UE has subscribed to the service but a sub-service of the service is prohibited; The UE subscribes to the service but a sub-service of the service is not provided; or the UE has subscribed to the service but the UE is not reachable from the service; A second network function including at least one of:

26. A second network function according to claim 25, wherein said second network function is further operable to perform a method according to any one of claims 11 to 22.

27. A computer program comprising a set of instructions which, when executed by at least one processor, cause the at least one processor to perform a method according to any one of claims 1 to 9.

28. A computer program comprising a set of instructions which, when executed by at least one processor, cause the at least one processor to perform a method according to any one of claims 10 to 22.

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