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EP-4740629-A1 - METHOD AND SYSTEM FOR SENDING CONFIGURABLE CAUSE IN REGISTRATION REJECT RESPONSE

EP4740629A1EP 4740629 A1EP4740629 A1EP 4740629A1EP-4740629-A1

Abstract

The present disclosure relates to a method and a system for sending configurable cause in registration reject response to allow UE to latch to a lower radio access network (e.g., 4G network). The disclosure encompasses: transmitting, to a network node of a first network, a first registration request for establishing a first connection between the UE [102] and the first network, the first registration request comprising an identifier associated with the UE [102]; receiving, from the network node of the first network, a registration reject message in response to transmission of the first registration request, the registration reject message being indicative of a failure in establishment of the first connection; transmitting, to a network node of a second network, a second registration request for establishing a second connection between the UE [102] and the second network upon receiving the registration reject message; and establishing the second connection.

Inventors

  • SINGH, MUKESH
  • Bisht, Birendra Singh
  • RAJESH, Durgesh
  • Banka, Venkatakrishna
  • DEVAL, Sunny
  • BEHERA, Dilip
  • RAJU, Neha
  • GOURH, Santosh
  • KUMAR, PRADEEP
  • BHATNAGAR, AAYUSH
  • NATALI, Fenil
  • MUKHERJEE, KOUSHIK
  • EDAKKARA, Jim
  • Ghag, Arpita Jaywant
  • BHATTACHARYA, Dipanjan
  • KUMAR, SANDEEP
  • Singh, Harbinder Pal

Assignees

  • Jio Platforms Limited

Dates

Publication Date
20260513
Application Date
20240611

Claims (20)

  1. 1. A method implemented on a User Equipment (UE) [102], the method comprising: transmitting, to a network node of a first network, a first registration request for establishing a first connection between the UE [102] and the first network, the first registration request comprising an identifier associated with the UE [102]; receiving, from the network node of the first network, a registration reject message in response to transmission of the first registration request, the registration reject message being indicative of a failure in establishment of the first connection; transmitting, to a network node of a second network, a second registration request for establishing a second connection between the UE [102] and the second network upon receiving the registration reject message; and establishing the second connection.
  2. 2. The method as claimed in claim 1, wherein the first network is 5th Generation (5G) New Radio network and the second network is 4th Generation (4G) Long Term Evolution (LTE) network.
  3. 3. The method as claimed in claim 2, wherein the network node of the first network is Access Mobility Function (AMF) [106] and the network node of the second network is Mobility Management Entity (MME) [304],
  4. 4. The method as claimed in claim 3, wherein the first registration request is for establishment of an Nl interface between the UE [102] and the AMF [106],
  5. 5. The method as claimed in claim 4, further comprises disabling a capability of the UE [102] to establish the N1 interface upon receiving the registration reject message.
  6. 6. The method as claimed in claim 1, wherein the registration reject message comprises a 5GMM cause element to indicate to the UE [102] that N 1 mode is not allowed for the first network.
  7. 7. The method as claimed in claim 1, wherein the identifier is Subscriber Permanent Identifier (SUPI).
  8. 8. A User Equipment (UE) [102] comprising: a UE memory [202b]; and a UE processor [202a] coupled to the UE memory [202b], wherein the UE processor [202a] causes the UE [202] to: transmit, to a network node of a first network, a first registration request for establishing a first connection between the UE [102] and the first network, the first registration request comprising an identifier associated with the UE [102]; receive, from the network node of the first network, a registration reject message in response to transmission of the first registration request, the registration reject message being indicative of a failure in establishment of the first connection; transmit, to a network node of a second network, a second registration request for establishing a second connection between the UE [102] and the second network upon receiving the registration reject message; and establish the second connection.
  9. 9. The UE [102] as claimed in claim 8, wherein the first network is 5th Generation (5G) New Radio network and the second network is 4th Generation (4G) Long Term Evolution (LTE) network.
  10. 10. The UE [102] as claimed in claim 8, wherein the network node of the first network is Access Mobility Function (AMF) [106] and the network node of the second network is Mobility Management Entity (MME) [304],
  11. 11. The UE [102] as claimed in claim 10, wherein the first registration request is for establishment of an N1 interface between the UE [102] and the AMF [106],
  12. 12. The UE [102] as claimed in claim 11, wherein the UE processor [202a] further causes the UE [102] to disable a capability of the UE [102] to establish the N1 interface upon receiving the registration reject message.
  13. 13. The UE [102] as claimed in claim 8, wherein the registration reject message comprises a 5GMM cause element to indicate to the UE [102] that the N1 mode is not allowed for the first network.
  14. 14. The UE [102] as claimed in claim 8, wherein the identifier is Subscriber Permanent Identifier (SUPI).
  15. 15. A method implemented on a network node of a first network, the method comprising: receiving, from a User Equipment (UE) [102], a first registration request for establishing a connection between the UE [102] and the first network, the first registration request comprising an identifier associated with the UE [102]; analysing, by the network node, the identifier to determine whether the establishment of connection between the UE [102] and the first network is feasible; and transmitting, to the UE [102], a registration reject message on determining that the establishment of the connection between the UE [102] and the first network is not feasible.
  16. 16. The method as claimed in claim 15, wherein the first network is 5th Generation (5G) New Radio network and the network node is Access Mobility Function (AMF) [106],
  17. 17. The method as claimed in claim 16, wherein the first registration request is for establishment of an N1 interface between the UE [102] and the AMF [106],
  18. 18. The method as claimed in claim 15, wherein the registration reject message comprises a 5GMM cause element to indicate to the UE [102] that the N 1 mode is not allowed for the first network.
  19. 19. The method as claimed in claim 15, wherein the identifier is Subscriber Permanent Identifier (SUPI).
  20. 20. A network node of a first network, the network node comprising: a receiving unit [206c] configured to receive, from a User Equipment (UE) [102], a first registration request for establishing a connection between the UE [102] and the first network, the first registration request comprising an identifier associated with the UE [102]; an analysis unit [206a] configured to analyse the identifier to determine whether the establishment of connection between the UE [102] and the first network is feasible; and a transmit unit [206d] configured to transmit, to the UE [102], a registration reject message on determining that the establishment of the connection between the UE [102] and the first network is not feasible.

Description

METHOD AND SYSTEM FOR SENDING CONFIGURABLE CAUSE IN REGISTRATION REJECT RESPONSE FIELD OF THE DISCLOSURE [0001] The present disclosure relates generally to the field of wireless communication systems. More particularly, the present disclosure relates to methods and systems for sending configurable cause in registration reject response, allowing User Equipment (UE) to connect to a lower radio network (e.g., 4G network) whenever it fails to connect to a higher radio network (e.g., 5G network), BACKGROUND [0002] 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. [0003] 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 the second-generation (2G) technology, digital communication and data services became possible, and text messaging was introduced. 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. [0004] In the fifth-generation (5G) New Radio (NR) network, it has been observed that certain user equipment(s) (UEs) with Subscriber Permanent Identifier (SUPI) associated with Public land mobile networks (PLMN) not permitted to establish connections attempt registration on the 5G network. According to the 3GPP standards, the Access and Mobility Management Function (AMF) sends “PLMN Not Allowed” in the registration reject message whenever the SUPI’s PLMN is unauthorized for registration in the 5G network. Many operators have 4G roaming agreements in place but have yet to establish 5G roaming agreements. Consequently, when users or subscribers of such operators attempt to register on the 5G network and receive “PLMN not Allowed” rejection, they are unable to access even 4G services due to the continuous latching process on the 5G network, despite the existence of 4G roaming agreement. Thus, the UEs fail to connect to either the 4G or 5G networks to use the required services such as signal transmission, voice-over-internet calls, internet access, and the like. [0005] Hence, in view of these and other existing limitations, there arises an imperative need to provide an efficient solution to overcome the above-mentioned limitations and to provide a method and system to allow UEs to access network services by latching onto a lower radio access network (e.g., 4G network) in the event of a failure to connect with higher radio access network (e.g., 5G network), particularly in absence of roaming agreements between operators for the higher radio access network. OBJECTS OF THE INVENTION [0006] Some of the objects of the present disclosure, which at least one embodiment disclosed herein satisfies are listed herein below. [0007] It is an object of the present disclosure to provide a system and a method to send configurable 5GMM cause in registration reject response in an event the SUPI PLMN is not allowed to register in 5G Network but has a mutual roaming agreement for other (lower) radio access networks. [0008] It is another object of the present disclosure to provide a solution that allows the UE to connect with a mutually agreed roaming network (e.g., 4G network) to avail services in the event the SUPI PLMNs are not allowed to register in the 5G network. SUMMARY OF THE DISCLOSURE [0009] This section is provided to introduce certain aspects of the present disclosure in a simplified form that are further described below in the detailed description. This summary is not intended to identify the key features or the scope of the claimed subject matter. [00010] According to an aspect of the present disclosure, a method implemented on a user equipment (UE) is disclosed. The method includes transmitting, to a network node of a first network, a first registration request for establishing a first connection between the UE and the first network. The first registration request comprises an identifier associated with the UE. Next, the method includes receiving, from the network n