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EP-4740583-A1 - METHOD AND SYSTEM FOR SERVICE FALLBACK IN 5G CORE NETWORK

EP4740583A1EP 4740583 A1EP4740583 A1EP 4740583A1EP-4740583-A1

Abstract

The present disclosure provides a method [300] and system [100] for service fallback in 5G core (5GC) network The method [300] comprising: monitoring, by a monitoring unit [102], one or more key performance indicators (KPIs) to detect an outage in the 5GC network; triggering, by a trigger unit [104], a first application programming interface (API) for an affected home public land mobile network (HPLMN) or a visited public land mobile network (VPLMN); sending an updated UE Usage Type (UUT) value in an update location answer (ULA); sending, by the transmitter unit [106] via home subscriber server (HSS) [206] or UDM unit [204], a first message in an access and mobility management function (AMF) registration response; and selecting, by a processing unit [108] via a mobility management entity (MME) [210], at least one of a 4G packet gateway (PGW) [214], and a session management function (SMF).

Inventors

  • SINGH, MUKESH
  • BHATNAGAR, AAYUSH
  • Agrahari, Nilesh
  • MORE, AJAY
  • Adate, Snehal
  • Arumugam, Yoganandan
  • Dhiman, Anshul

Assignees

  • Jio Platforms Limited

Dates

Publication Date
20260513
Application Date
20240611

Claims (20)

  1. 1. A method [300] for service fallback in 5G core (5GC) network, comprising: monitoring, by a monitoring unit [102], one or more key performance indicators (KPIs) to detect an outage in the 5GC network; triggering, by a trigger unit [104], a first application programming interface (API) for one of an affected home public land mobile network (HPLMN) and a visited public land mobile network (VPLMN) based on detection of the outage; sending, by a transmitter unit [106] via one of a home subscriber server (HSS) [206] and a user data management (UDM) unit [204], an updated UE Usage Type (UUT) value in an update location answer (ULA) based on the affected one of the HPLMN and VPLMN; sending, by the transmitter unit [106] via one of the HSS [206] and the UDM unit [204], a first message in an access and mobility management function (AMP) [208] registration response based on the one of affected HPLMN and VPLMN; and selecting, by a processing unit [108] via a mobility management entity (MME) [210], at least one of a 4G packet gateway (PGW) [214] and a session management function (SMF) based on the updated UUT value.
  2. 2. The method [300] as claimed in claim 1, wherein the method comprises sending, by the transmitter unit via the AMF [208], an "N 1 mode not allowed" code in a non-access stratum (NAS) to prevent further attempts to connect to the 5GC network.
  3. 3. The method [300] as claimed in claim 1, wherein the one or more KPIs comprises at least one of a latency, a throughput, a packet loss rate, and a signal strength.
  4. 4. The method [300] as claimed in claim 1, wherein the triggering of the first application programming interface (API) is performed automatically based on a predefined network outage threshold.
  5. 5. The method [300] as claimed in claim 1, wherein the first message is an “Unknown 5GS Subscription” message.
  6. 6. The method [300] as claimed in claim 5, wherein the method includes providing, by the processing unit [108], an error code indicating a reason for a subscription status as “unknown.”
  7. 7. The method [300] as claimed in claim 1, wherein the selecting of at least one of the PGW [214] and the SMF is based on an analysis of a type of data traffic specified by the updated UUT value.
  8. 8. The method [300] as claimed in claim 1, wherein the method comprises defining, by the processing unit [108], a time period for a user equipment (UE) [212] to attempt to connect to the network, wherein the UE [212] attempts to reconnect to the network on expiration of a defined time period.
  9. 9. The method [300] as claimed in claim 1, wherein the first API corresponds to a UUT API.
  10. 10. A system [100] for service fallback in 5G core (5GC) network, the system comprises: a monitoring unit [102] configured to monitor one or more key performance indicators (KPIs) to detect an outage in the 5GC network; a trigger unit [104] connected with the monitoring unit [102], the trigger unit [104] configured to trigger a first application programming interface (API) for one of an affected home public land mobile network (HPLMN) and a visited public land mobile network (VPLMN) based on detection of the outage; a transmitter unit [106] connected with the trigger unit [104], the transmitter unit [106] configured to: send, via one of a home subscriber server (HSS) [206] and a user data management (UDM) unit [204], an updated UUT value in an update location answer (ULA) based on the affected one of HPLMN and VPLMN; send, via one of the HSS [206] and the UDM unit [204], a first message in an access and mobility management function (AMF) registration response based on one of the affected HPLMN and VPLMN; and a processing unit [108] connected with the transmitter unit [106], the processing unit [108] configured to select, via a mobility management entity (MME) [210], at least one of a 4G packet gateway (PGW) [214], and a session management function (SMF) based on the updated UE Usage Type (UUT) value.
  11. 11. The system [100] as claimed in claim 10, wherein the transmitter unit [106] is configured to send, via the AMF [208], an "N1 mode not allowed" code in a non-access stratum (NAS) to prevent further attempts to connect to the 5GC network.
  12. 12. The system [100] as claimed in claim 10, wherein the one or more KPIs comprises at least one of a latency, a throughput, a packet loss rate, and a signal strength.
  13. 13. The system [100] as claimed in claim 10, wherein the trigger unit [104] is configured to trigger the first application programming interface (API) automatically based on a predefined network outage threshold.
  14. 14. The system [100] as claimed in claim 10, wherein the first message is an "Unknown 5GS Subscription" message.
  15. 15. The system [100] as claimed in claim 14, wherein the processing unit [108] is configured to provide an error code indicating a reason for the subscription status as "unknown" .
  16. 16. The system [100] as claimed in claim 10, wherein the processing unit [108] is configured to select at least one of the PGW [214] and the SMF based on an analysis of a type of data traffic specified by the updated UUT value.
  17. 17. The system [100] as claimed in claim 10, wherein the processing unit [108] is configured to define a time period for a user equipment (UE) [212] to attempt to connect to the network, wherein the UE [212] attempts to reconnect to the network on expiration of the defined time period.
  18. 18. The system [100] as claimed in claim 10, wherein the first API corresponds to a UUT API.
  19. 19. A user equipment (UE) for service fallback in 5G core (5GC) network, the UE comprising: - a memory; and - a processor connected to the memory, wherein the processor is configured to: o transmit, to a system [100], a request to monitor one or more key performance indicators (KPIs) to detect an outage in the 5GC network, and o receive from the system [100], a response associated with the request. wherein the response is received based on: monitoring, by the system [100], the one or more key performance indicators (KPIs) to detect the outage in the 5GC network, triggering, by the system [100], a first application programming interface (API) for one of an affected home public land mobile network (HPLMN) and a visited public land mobile network (VPLMN) based on detection of the outage, sending, by the system [100], an updated UE Usage Type (UUT) value in an update location answer (ULA) based on the affected one of the HPLMN and VPLMN, sending, by the system [100], a first message in an access and mobility management function (AMP) [208] registration response based on the one of affected HPLMN and VPLMN, and selecting, by the system [100], at least one of a 4G packet gateway (PGW) [214] and a session management function (SMF) based on the updated UUT value.
  20. 20. A non-transitory computer readable storage medium storing instruction for service fallback in 5G core (5GC) network., the instructions include executable code which, when executed by a one or more units of a system, causes: a monitoring unit [102] to monitor one or more key performance indicators (KPIs) to detect an outage in the 5GC network, a trigger unit [104] to trigger a first application programming interface (API) for one of an affected home public land mobile network (HPLMN) and a visited public land mobile network (VPLMN) based on detection of the outage, a transmitter unit [106] to send via one of a home subscriber server (HSS) [206] and a user data management (UDM) unit [204], an updated UE Usage Type (UUT) value in an update location answer (ULA) based on the affected one of the HPLMN and VPLMN, the transmitter unit [106] to send via one of the HSS [206] and the UDM unit [204], a first message in an access and mobility management function (AMF) [208] registration response based on the one of affected HPLMN and VPLMN, and a processing unit [108] to select via a mobility management entity (MME) [210], at least one of a 4G packet gateway (PGW) [214] and a session management function (SMF) based on the updated UUT value.

Description

METHOD AND SYSTEM FOR SERVICE FALLBACK IN 5G CORE NETWORK FIELD OF THE DISCLOSURE [001] The present disclosure relates generally to the field of wireless communication systems. In particular, the present disclosure relates to service fallback. More particularly, the present disclosure relates to method and system for service fallback ensuring uninterrupted service continuity in 5G core network. BACKGROUND [002] The following description of related art is intended to provide background information pertaining to the field of the disclosure. This section may include certain aspects of the art that may be related to various features of the present disclosure. However, it should be appreciated that this section be used only to enhance the understanding of the reader with respect to the present disclosure, and not as admissions of prior art. [003] Wireless communication technology has rapidly evolved over the past few decades, with each generation bringing significant improvements and advancements. The first generation of wireless communication technology was based on analog technology and offered only voice services. However, with the advent of second-generation (2G) technology, digital communication and data services became possible, and text messaging was introduced. The third- generation (3G) technology marked the introduction of high-speed internet access, mobile video calling, and location-based services. The fourth generation (4G) technology revolutionized wireless communication with faster data speeds, better network coverage, and improved security. Currently, the fifth generation (5G) technology is being deployed, promising even faster data speeds, low latency, and the ability to connect multiple devices simultaneously. With each generation, wireless communication technology has become more advanced, sophisticated, and capable of delivering more services to its users. [004] One of the main problems with existing technology prior to this disclosure is that users (UE end) may need to manually switch their devices to the 4G network during an outage in the 5GC network. The outage refers to a period during which a telecommunication network or service is unavailable or not functioning properly. This issue may arise due to various reasons such as technical issues, equipment failure, maintenance activities, or external factors like severe weather conditions or natural disasters. During the outage, the users may experience disruptions in their ability to make calls, send messages, access the internet, or utilize other network-dependent services. Further, the issue of manual intervention during network disruptions posed several drawbacks and inconveniences. Firstly, it introduced a delay in the restoration of connectivity for users, as they were required to actively switch their devices to an alternative network mode. This delay could be especially problematic in critical situations where swift access to communication and data services is imperative. Additionally, the manual switching process added complexity and potential confusion for users, particularly those less familiar with technical aspects of network management. This complexity could lead to errors in network configuration, further exacerbating downtime and connectivity issues. This could lead to loss of service, inconvenience, and a poor user experience. Prior systems may not have a method for dynamically adjusting the type of network used based on outages in specific nodes of the home network or visited network. [005] In addition to this, a Home Subscriber Server (HSS) and a User Data Management (UDM) are core elements within telecommunications networks, responsible for managing subscriber data and facilitating seamless connectivity for mobile users. In existing systems, there is a potential limitation regarding the Home Subscriber Server/User Data Management (HSS/UDM) component's ability to include various UE Usage Type (UUT) values in the Update Eocation Answer (ULA). These UUT values represent different types of UE Usage Type values. The ULA message is a response from the HSS/UDM following a request to update a user's location within the network, indicating where the user's subscription is located (Home PLMN) or the network they are currently connected to (Visited PLMN). The issue arises from the fact that the HSS/UDM may not differentiate between these two scenarios when sending UUT values. This means that the ULA message might not accurately reflect the type of user traffic being experienced based on whether the user is in their home network or roaming in another network. This lack of distinction could potentially impact network management and quality of service (QoS) provisioning, as different types of traffic may require varying levels of resources or priority handling. [006] In previous arts, when a user device attempts to register with the network through an Access and Mobility Management Function (AMF), the AMF sends a request to the HSS/UDM