A method and a system to re-route a registration request

Abstract

The present disclosure relates to a method and a system for re-routing a registration request by a network node in a wireless communication system The present disclosure encompasses receiving, at a network node [106] via a radio access network [RAN] [104], the registration request for establishment of a connection between a user equipment, UE [102] and a target network node [108]. The method then leads to authenticating, by the network node [106], an identity of the UE [102] based on a communication with a first authentication network node for the received registration request. The method then encompasses re-routing, by the network node [106] via the RAN [104], the registration request to the target network node [108] based on a failure of the authentication of the identity of the UE [102].

Description

A METHOD AND A SYSTEM TO RE-ROUTE A REGISTRATION REQUESTFIEED OF THE DISCEOSURE

[0001] Embodiments of the present disclosure relates generally to the field of wireless communication systems. More particularly, embodiments of the present disclosure relate to a method and system to re-route a registration request to a correct Access and Mobility Function (AMF) when multiple dedicated isolated networks exist simultaneously within a Public Land Mobile Network (PLMN).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. 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.

[0004] To meet an increasing demand for radio data traffic, efforts have been made to develop an improved fifth-Generation (5G) communication system or a pre-5G communication system or 5G technology. The 5G communication system or the pre-5G communication system may also be referred to as a beyond 4G network communication system or a post LTE system. Presently, the 5G communication system 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.

[0005] To achieve a high data transmission rate, the 5G communication system is considered to be implemented in a very high frequency (mm Wave) band (e.g., 60 GHz band).

[0006] Still further, in order to relieve path loss of a radio wave and increase a transfer distance of the radio wave in the very high frequency band, beamforming, massive multiple input multiple output (mMIMO), full dimensional MIMO (FD-MIMO), array antennas, analog beam-forming, and large-scale antenna technologies have been discussed in connection with 5G communication system.

[0007] With a view to enhance or improve a network of the 5G communication system, technologies such as an evolved small cell, an advanced small cell, a cloud Radio Access Network (cloud RAN), an ultra-dense network, a device -to-de vice communication (D2D), a wireless backhaul, a moving network, cooperative communication, coordinated multi-points (CoMPs), and reception interference cancellation have been developed.

[0008] Additionally, the Internet has evolved from a human-centered connection network through which a human being generates and consumes information to an Internet of things (loT) network that is configured to transmit or receive information between distributed components, i.e., things, and processes the information. The Internet of everything (loE) technology in which the big data processing technology, etc., is combined with the loT technology by connection with a cloud server, etc., has also emerged.

[0009] In order to implement the loT, technology elements, such as a sensing technology, wired and wireless communication and network infrastructure, a service interface technology, and a security technology, are required. For example, technologies such as a sensor network, machine to machine (M2M), and machine type communication (MTC) for connecting between things have been extensively researched. In another example, the loT environment provides an intelligent Internet technology (IT) service. Such IT service creates a new value in human life by collecting and analyzing data generated in the connected things. The loT finds its applicability in various fields such as a smart home, a smart building, a smart city, a smart car or a connected car, a smart grid, health care, smart appliances, and an advanced healthcare service, by fusing and combining existing IT with various industries. Thus, various attempts have been made to apply the 5G communication system to the loT network.

[0010] In view of the foregoing, with the development of 5G communication technology, a method is required for providing an efficient service in the 5G mobile communication environment by allowing a user to quickly find network providing services that are desired by the user equipment (UE), when the user equipment initially accesses the 5G network.

[0011] Also, in 5G-NR communication system, different dedicated isolated networks e.g., a cellular loT network and a mobility network, can exist simultaneously within a common Public Land Mobile Network (PLMN), where the different isolated networks are deployed with dedicated Authentication Server Function (AUSF), Unified Data Management (UDM), and the other network function entities. The AUSF is mainly for Authentication Process and the UDM is a function / service that manages user data for all process. The UDM is interfaced with many other services: AUSF, Access and Mobility Management Function (AMF), Session Management Function (SMF), Short Message Service Function (SMSF). It means when services such as the AUSF, the AMF, the SMF, the SMSF needs subscriber data, it requests it to the UDM and the UDM provide the subscriber data to the services that requested.

[0012] In addition, data between a UE and network entities (or another UE) is transmitted on a data path through various components. This resource allocation and the data path is configured statically or semi-statically. However, the resource allocation and parameters of the components can be configured along the data path dynamically (by automation), by defining a set of parameters on the data path for specific UEs. The set of parameters assigned for the UEs is called a ‘Slice’ of the network. Thus, network slice is a concept of splitting all resources along the data path into multiple sets, each of which is optimized for specific UEs.

[0013] Conventionally, the user data is not shared among the network entities between different 5G networks, and thus re-routing a registration request from a UE to a particular or target AMF based on network slice is not feasible and the authentication fails or terminates for a wrongly routed UE.

[0014] Thus, there exists an imperative need in the art to allow a UE (or a registration request of the UE) to be re-routed to an appropriate or target AMF when different dedicated isolated networks e.g., a cellular loT network, a mobility network, exist in a common PLMN.OBJECTS OF THE DISCLOSURE

[0015] Some of the objects of the present disclosure, which at least one embodiment disclosed herein satisfies are listed herein below.

[0016] It is an object of the present disclosure to provide a system and a method that allows the UE or the registration request of the UE to be re-routed to a desired AMF when two or more isolated networks, e.g., a cellular loT network and a mobility network, exist in a common PLMN.

[0017] It is another object of the present disclosure to provide a system and a method for allowing successfully registration of the UE in an appropriate network in an efficient manner.SUMMARY OF THE DISCLOSURE

[0018] 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.

[0019] According to an aspect of the present disclosure, a method to re-route a registration request is disclosed. The method includes receiving, by a transceiver unit at a network node via a Radio Access Network (RAN), a registration request for establishment of a connection between a User Equipment (UE) and a target network node. Next, the method includes authenticating, by an authenticator unit at the network node, an identity of the UE based on a communication with a first authentication network node for the received registration request. Thereafter, the method includes re-routing, by a router unit at the network node via the RAN, the registration request to a target network node based on a failure of the authentication of the identity of the UE.

[0020] Further, the network node is associated with a first access and mobility management function (AMF1) of a first type of network.

[0021] Further, the target network node is associated with a second access and mobility management function (AMF2) of a second type of network, wherein the first type of network and the second type of network are isolated networks and belong to a same public land mobile networks (PLMN) to provide different services to users.

[0022] Further, the first authentication network node is a first authentication server function (AUSF1) of the first type of network.

[0023] Further, the failure of the authentication corresponds to a reception of an error message from the first authentication network node (AUSF1) while authenticating the UE.

[0024] Also, the error message is a 404 error message to indicate to the network node that an user data is not provisioned in the first type of network.

[0025] Further, the method encompasses: authenticating, by the target network node via the authenticator unit, the identity of the UE based on a communication with a second authentication server function (AUSF2) of the second type of network; and establishing, by the target network node via an analyzer unit, the connection between the UE and the target network node based on a reception of a positive response from the second authentication server function (AUSF2).

[0026] According to another aspect of the present disclosure, a system for re-routing a registration request is disclosed. The system comprising a storage unit and a transceiver unit coupled to the storage unit, wherein the transceiver unit is configured to receive via a RAN , a registration request for establishment of a connection between a UE and a target network node. The system further comprises an authenticator unit connected to the transceiver unit, wherein the authenticator unit is configured to authenticate at the network node an identity of the UE based on a communication with a first authentication network node for the received registration request. The authenticator unit is connected to a re-routing unit, wherein the re-routing unit is configured to rerouteat the network node via the RAN the registration request to the target network node based on a failure of the authentication of the identity of the UE.

[0027] Another aspect of the present disclosure relates to user equipment (UE) device for rerouting a registration request, via a user interface (UI). The User Equipment (UE) may include a memory and a processor coupled to the memory. The processor may be configured to send a registration request to a network node. The registration request may be used for establishing a connection between the UE and a target network node. Further, the connection may be established between the UE and the target network node based on: authentication of an identity of UE, at the network node, based on a communication with a first authentication network node for the received registration request; and re-routing, by the network node via the RAN, the registration request to the target network node based on a failure of the authentication of the identity of the UE.

[0028] Yet another aspect of the present disclosure relates to a non-transitory computer- readable storage medium storing instructions for re-routing registration requests within a telecommunication network. These instructions entail executable code that, when executed by one or more units of the system the instructions facilitate: a transceiver unit to receive, via a RAN, the registration request for establishment of a connection between a UE and a target network node; an authenticator unit to authenticate, at the network node, an identity of the UE based on a communication with a first authentication network node for the received registration request; and a re-routing unit to re-route, at the network node via the RAN, the registration request to the target network node based on a failure of the authentication of the identity of the UE.BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which are incorporated herein, and constitute a part of this disclosure, illustrate exemplary embodiments of the disclosed methods and systems in which like reference numerals refer to the same parts throughout the different drawings. Components in the drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Some drawings may indicate the components using block diagrams and may not represent the internal circuitry of each component. It will be appreciated by those skilled in the art that disclosure of such drawings includes disclosure of electrical components, electronic components or circuitry commonly used to implement such components.

[0030] FIG. 1 illustrates an exemplary block diagram representation of 5th generation core (5GC) network architecture [100A], in accordance with exemplary embodiment of the present disclosure;

[0031] FIG. 1A illustrates an exemplary system diagram depicting a system

[0100] for rerouting a registration request in accordance with exemplary embodiments of the present disclosure;

[0032] FIG. IB illustrates an exemplary diagram of a communication network architecture [100B] of a Public Land Mobile Network (PLMN) network with two isolated network types, in accordance with exemplary embodiments of the present disclosure;

[0033] FIG. 2A illustrates an exemplary method flow diagram indicating a process

[0200] of re-routing registration request performed by an initial access and mobility management function (AMF) with two isolated networks in same PLMN, in accordance with exemplary embodiments of the present disclosure; and

[0034] FIG. 2B illustrates an exemplary signalling flow diagram

[0300] indicating a process performed by an initial access and mobility management function (AMF), in accordance with exemplary embodiments of the present disclosure.

[0035] FIG.3 illustrates an exemplary block diagram of a computing device upon which the features of the present disclosure may be implemented in accordance with exemplary implementation of the present disclosure.

[0036] The foregoing shall be more apparent from the following more detailed description of the disclosure.DETAILED DESCRIPTION

[0037] In the following description, for the purposes of explanation, various specific details are set forth in order to provide a thorough understanding of embodiments of the present disclosure. It will be apparent, however, that embodiments of the present disclosure may be practiced without these specific details. Several features described hereafter can each be used independently of one another or with any combination of other features. An individual feature may not address any of the problems discussed above or might address only some of the problems discussed above. Some of the problems discussed above might not be fully addressed by any of the features described herein. Example embodiments of the present disclosure are described below, as illustrated in various drawings in which like reference numerals refer to the same parts throughout the different drawings.

[0038] The ensuing description provides exemplary embodiments only, and is not intended to limit the scope, applicability, or configuration of the disclosure. Rather, the ensuing description of the exemplary embodiments will provide those skilled in the art with an enabling description for implementing an exemplary embodiment. It should be understood that various changes may bemade in the function and arrangement of elements without departing from the spirit and scope of the disclosure as set forth.

[0039] It should be noted that the terms "mobile device", "user equipment", "user device", “communication device”, “device” and similar terms are used interchangeably for the purpose of describing the disclosure. These terms are not intended to limit the scope of the disclosure or imply any specific functionality or limitations on the described embodiments. The use of these terms is solely for convenience and clarity of description. The disclosure is not limited to any particular type of device or equipment, and it should be understood that other equivalent terms or variations thereof may be used interchangeably without departing from the scope of the disclosure as defined herein.

[0040] Specific details are given in the following description to provide a thorough understanding of the embodiments. However, it will be understood by one of ordinary skill in the art that the embodiments may be practiced without these specific details. For example, circuits, systems, networks, processes, and other components may be shown as components in block diagram form in order not to obscure the embodiments in unnecessary detail. In other instances, well-known circuits, processes, algorithms, structures, and techniques may be shown without unnecessary detail in order to avoid obscuring the embodiments.

[0041] Also, it is noted that individual embodiments may be described as a process which is depicted as a flowchart, a flow diagram, a data flow diagram, a structure diagram, or a block diagram. Although a flowchart may describe the operations as a sequential process, many of the operations can be performed in parallel or concurrently. In addition, the order of the operations may be re-arranged. A process is terminated when its operations are completed but could have additional steps not included in a figure.

[0042] In addition, each block may indicate some of modules, segments, or codes including one or more executable instructions for executing a specific logical fiinction(s). Further, functions mentioned in the blocks occur regardless of a sequence in some alternative embodiments. For example, two blocks that are contiguously illustrated may be simultaneously performed in fact or be performed in a reverse sequence depending on corresponding functions.

[0043] Herein, the term "unit" indicates software or hardware components, such as a Field- Programmable Gate Array (FPGA) and an Application- Specific Integrated Circuit (ASIC).However, the meaning of the "unit" is not limited to software or hardware. For example, a "unit" may be configured to be in a storage medium that may be addressed and may also be configured to be reproduced one or more processor. Accordingly, a "unit" may include components such as software components, object oriented software components, class components, and task components and processors, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuit, data, database, data structures, tables, arrays, and variables. The functions provided in the components and the "units" may be combined with a smaller number of components, and the "units" or may be further separated into additional components and "units". In addition, the components and the "units" may also be implemented to reproduce one or more central processing units (CPUs) within a device or a security multimedia card.

[0044] The word “exemplary” and / or “demonstrative” is used herein to mean serving as an example, instance, or illustration. For the avoidance of doubt, the subject matter disclosed herein is not limited by such examples. In addition, any aspect or design described herein as “exemplary” and / or “demonstrative” is not necessarily to be construed as preferred or advantageous over other aspects or designs, nor is it meant to preclude equivalent exemplary structures and techniques known to those of ordinary skill in the art. Furthermore, to the extent that the terms “includes,” “has,” “contains,” and other similar words are used in either the detailed description or the claims, such terms are intended to be inclusive — in a manner similar to the term “comprising” as an open transition word — without precluding any additional or other elements.

[0045] As used herein, an “electronic device”, or “portable electronic device”, or “user device” or “communication device” or “user equipment” or “device” refers to any electrical, electronic, electromechanical and computing device. The user device is capable of receiving and / or transmitting one or parameters, performing function / s, communicating with other user devices and transmitting data to the other user devices. The user equipment may have a processor, a display, a memory, a battery and an input-means such as a hard keypad and / or a soft keypad. The user equipment may be capable of operating on any radio access technology including but not limited to IP-enabled communication, Zig Bee, Bluetooth, Bluetooth Low Energy, Near Field Communication, Z-Wave, Wi-Fi, Wi-Fi direct, etc. For instance, the user equipment may include, but not limited to, a mobile phone, smartphone, virtual reality (VR) devices, augmented reality (AR) devices, laptop, a general-purpose computer, desktop, personal digital assistant, tablet computer, mainframe computer, or any other device as may be obvious to a person skilled in the art for implementation of the features of the present disclosure.

[0046] Further, the user device may also comprise a “processor” or “processing unit” includes processing unit, wherein processor refers to any logic circuitry for processing instructions. The processor may be a general-purpose processor, a special purpose processor, a conventional processor, a digital signal processor, a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits, Field Programmable Gate Array circuits, any other type of integrated circuits, etc. The processor may perform signal coding data processing, in used herein, “a user equipment”, “a user device”, “a smart-user-device”, “a smart-device”, “an electronic device”, “a mobile device”, “a handheld device”, “a wireless communication device”, “a mobile communication device”, “a communication device” may be any electrical, electronic and / or computing device or equipment, capable of implementing the features of the present disclosure. The user equipment / device may include, but is not limited to, a mobile phone, smart phone, laptop, a general-purpose computer, desktop, personal digital assistant, tablet computer, wearable device or any other computing device which is capable of implementing the features of the present disclosure. Also, the user device may contain at least one input means configured to receive an input from at least one of a transceiver unit, a processing unit, a storage unit, a detection unit and any other such unit(s) which are required to implement the features of the present disclosure.

[0047] As used herein, “storage unit” or “memory unit” refers to a machine or computer- readable medium including any mechanism for storing information in a form readable by a computer or similar machine. For example, a computer-readable medium includes Read-Only Memory (“ROM”), Random Access Memory (“RAM”), magnetic disk storage media, optical storage media, flash memory devices or other types of machine-accessible storage media. The storage unit stores at least the data that may be required by one or more units of the system to perform their respective functions input / output processing, and / or any other functionality that enables the working of the system according to the present disclosure. More specifically, the processor is a hardware processor.

[0048] As portable electronic devices and wireless technologies continue to improve and grow in popularity, the advancing wireless technologies for data transfer are also expected to evolve and replace the older generations of technologies. In the field of wireless data communications, the dynamic advancement of various generations of cellular technology are also seen. The development, in this respect, has been incremental in the order of second generation (2G), third generation (3G), fourth generation (4G), and now fifth generation (5G), and more such generations are expected to continue in the forthcoming time.

[0049] Hereinafter, terms identifying an access node, terms indicating network entities, terms indicating messages, terms indicating an interface between network entities, and terms indicating various pieces of identification information, as used in the following description, are exemplified for convenience of explanation. Accordingly, the disclosure is not limited to terms to be described below, and other terms indicating objects having equal technical meanings may be used.

[0050] Hereinafter, for convenience of explanation, the disclosure may use terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standards or technical specifications. However, the disclosure is not limited to such terms and names, and may also be applied to systems following other standards. In the disclosure, depending on a use case or an implementation, an evolved Node B (eNB) may be interchangeably used with a next-generation Node B (gNB) for convenience of explanation. That is, a Base Station (BS) described by an eNB may represent a gNB.

[0051] In the following descriptions, the term "base station" refers to an entity for allocating resources to a User Equipment (UE) and may be used interchangeably with at least one of a gNode B, an eNode B, a node B, a base station (BS), a radio access unit, a Radio Access Network (RAN), a Base Station Controller (BSC), or a node over a network. The term "terminal" may be used interchangeably with a user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. However, the disclosure is not limited to the aforementioned examples.

[0052] In particular, the disclosure is applicable to 3GPP new radio (NR) (or 5th generation (5G)) mobile communication standards. The disclosure is applicable to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail trade, security, and safety services) based on 5G communication technologies and Internet of things (loT)-related technologies. The term UE may also indicate a mobile phone, NB-IoT devices, sensors, and other wireless communication devices.

[0053] Radio Access Technology (RAT) refers to the technology used by mobile devices / UserEquipment (UE) to connect to a cellular network. It refers to the specific protocol and standards that govern the way devices communicate with base stations, which are responsible for providing the wireless connection. Further, each RAT has its own set of protocols and standards for communication, which define the frequency bands, modulation techniques, and other parametersused for transmitting and receiving data. Examples of RATs include GSM (Global System for Mobile Communications), CDMA (Code Division Multiple Access), UMTS (Universal Mobile Telecommunications System), UTE (Long-Term Evolution), and 5G. The choice of RAT depends on a variety of factors, including the network infrastructure, the available spectrum, and the mobile device's / device's capabilities. Mobile devices often support multiple RATs, allowing them to connect to different types of networks and provide optimal performance based on the available network resources.

[0054] As discussed in the background section, the user data is not shared among the network entities of between different 5G networks and thus re-routing a registration request from a UE to a particular or target access and mobility management function (AMF) based on network slice is not feasible, since the authentication fails or terminates for the wrongly routed user or the UE.

[0055] The present disclosure aims to overcome the above-mentioned and other existing problems in this field of technology by allowing the UE (or the registration request of the UE) to be re-routed to an appropriate or target AMF when two or more isolated networks e.g., a cellular loT network, a mobility network, exist in a common PLMN. In particular, the present disclosure provides a novel method and system performed by the AMF in a wireless communication system having dedicated isolated networks such a cellular loT network and a mobility network. According to the proposed solution, an initial AMF receives an initial registration request message from the UE through a radio access network (RAN). Since the initial AMF is not an appropriate AMF for the registration request from the UE, the initial AMF generates an error message. Upon receiving such an error message and identifying that the initial AMF is not suitable for serving the UE, the initial AMF - instead of terminating the registration request of the UE - may reject the registration request and re-route the registration request of the UE to the target AMF of another dedicated isolated network having a common PLMN.

[0056] Thus, the technical effect of the proposed solution is to re-route the registration request of the UE to the desired or target AMF thereby improving the efficiency of service in 5G communication environment. Thus, the overall user experience in using the 5G services is enhanced since the proposed solution does not terminate the registration request of the UE and the UE does not have to again re-initiate registration request to a different AMF of the dedicated network, unlike network slicing where the authentication fails for the wrongly routed user or the UE.

[0057] The technical advancement of the proposed solution is that it enables seamless operation of 5G services in a 5G network environment. Further, it avoids unnecessary transmission of registration request to a different AMF thereby saving the resources and battery consumption of the UE.

[0058] The present disclosure proposes a method and a system performed by an Access and Mobility Management Function (AMF) in a wireless communication system. The term ‘AMF’ as used herein, refers to an access and mobility management function which is responsible for managing the mobility of User Equipment (UE) within the network. It also handles authentication and security functions for UE accessing the network. In particular, the wireless communication system includes two or more dedicated isolated networks e.g., a cellular loT network and mobility network, existing simultaneously within a common a public land mobile network (PLMN). The term ‘cellular loT’ network as used herein, refers to the deployment of cellular network technologies to support the connectivity and communication requirements of loT (Internet of Things) devices. Further, the term ‘mobility network’ indicates a type of network infrastructure designed to facilitate seamless connectivity and communication for mobile devices. The term ‘PLMN’ as used herein is a wireless telecommunications network that provides mobile communication services to users within a defined geographic area. It consists of various network elements, including base stations, switches, and network nodes, interconnected to facilitate mobile communication. The two or more isolated networks are deployed with dedicated Authentication Server Function (AUSF), Unified Data Management (UDM), and the other network function entities.

[0059] According to an embodiment of the present disclosure, the AMF receives an initial registration request message from a UE. The registration request message from the UE is routed to the AMF through a Radio Access Network (RAN). The registration request message from the UE includes, but not limited to, a first information includes different parameters associated with the registration request message. Upon receiving such a registration request message of a UE, the AMF may need to reroute the Registration request to another AMF, e.g. when the initial AMF is not the appropriate AMF to serve the UE. The term ‘re-route’ refers to a process of redirecting requests from one path or destination to another within a network. In the context of the described system, re-routing involves redirecting registration requests from the original network node to a different target network node in response to authentication failure or other predetermined conditions. Exemplarily, when the initial AMF is not the appropriate AMF to serve the UE, theinitial AMF may receive an error message indicating that the initial AMF is not the appropriate AMF to serve the UE.

[0060] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0061] FIG. 1 illustrates an exemplary block diagram representation of 5th generation core (5GC) network architecture, in accordance with exemplary embodiment of the present disclosure. As shown in FIG. 1, the 5GC network architecture [100A] includes a user equipment (UE) [102a], a radio access network (RAN) [104a], an access and mobility management function (AMF) [106a], a Session Management Function (SMF) [108a], a Service Communication Proxy (SCP) [110a], an Authentication Server Function (AUSF) [112a], a Network Slice Specific Authentication and Authorization Function (NSSAAF) [114a], a Network Slice Selection Function (NSSF) [116a], a Network Exposure Function (NEF) [118a], a Network Repository Function (NRF) [120a], a Policy Control Function (PCF) [122a], a Unified Data Management (UDM) [124a], an application function (AF) [126a], a User Plane Function (UPF) [128a], a data network (DN) [130a], wherein all the components are assumed to be connected to each other in a manner as obvious to the person skilled in the art for implementing features of the present disclosure.

[0062] The User Equipment (UE) [102a] interfaces with the network via the Radio Access Network (RAN) [104a]; the Access and Mobility Management Function (AMF) [106a] manages connectivity and mobility, while the Session Management Function (SMF) [108a] administers session control; the service communication proxy (SCP) [110a] routes and manages communication between network services, enhancing efficiency and security, and the Authentication Server Function (AUSF) [112a] handles user authentication; the Non-Standalone Access Architecture Function (NSSAAF) [114a] for integrating the 5G core network with existing 4G LTE networks i.e., to enable Non-Standalone (NSA) 5G deployments, the Network Slice Selection Function (NSSF) [116a], Network Exposure Function (NEF) [118a], and Network Repository Function (NRF) [120a] enable network customization, secure interfacing with external applications, and maintain network function registries respectively; the Policy Control Function (PCF) [122a] develops operational policies, and the Unified Data Management (UDM) [124a] manages subscriber data; the Application Function (AF) [126a] enables application interaction, the User Plane Function (UPF) [128a] processes and forwards user data, and the Data Network (DN) [130a] connects to external internet resources; collectively, these components are designed to enhance mobile broadband, ensure low-latency communication, and support massive machine-type communication, solidifying the 5GC as the infrastructure for next-generation mobile networks.

[0063] Radio Access Network (RAN) [104a] is the part of a mobile telecommunications system that connects user equipment (UE) [102a] to the core network (CN) and provides access to different types of networks (e.g., 5G network). It consists of radio base stations and the radio access technologies that enable wireless communication.

[0064] Access and Mobility Management Function (AMF) [106a] is a 5G core network function responsible for managing access and mobility aspects, such as UE registration, connection, and reachability. It also handles mobility management procedures like handovers and paging.

[0065] Session Management Function (SMF) [108a] is a 5G core network function responsible for managing session-related aspects, such as establishing, modifying, and releasing sessions. It coordinates with the User Plane Function (UPF) for data forwarding and handles IP address allocation and QoS enforcement.

[0066] Service Communication Proxy (SCP) [110a] is a network function in the 5G core network that facilitates communication between other network functions by providing a secure and efficient messaging service. It acts as a mediator for service-based interfaces.

[0067] Authentication Server Function (AUSF) [112a] is a network function in the 5G core responsible for authenticating UEs during registration and providing security services. It generates and verifies authentication vectors and tokens.

[0068] Network Slice Specific Authentication and Authorization Function (NSSAAF) [114a] is a network function that provides authentication and authorization services specific to network slices. It ensures that UEs can access only the slices for which they are authorized.

[0069] Network Slice Selection Function (NSSF) [116a] is a network function responsible for selecting the appropriate network slice for a UE based on factors such as subscription, requested services, and network policies.

[0070] Network Exposure Function (NEF) [118a] is a network function that exposes capabilities and services of the 5G network to external applications, enabling integration with third-party services and applications.

[0071] Network Repository Function (NRF) [120a] is a network function that acts as a central repository for information about available network functions and services. It facilitates the discovery and dynamic registration of network functions.

[0072] Policy Control Function (PCF) [122a] is a network function responsible for policy control decisions, such as QoS, charging, and access control, based on subscriber information and network policies.

[0073] Unified Data Management (UDM) [124a] is a network function that centralizes the management of subscriber data, including authentication, authorization, and subscription information.

[0074] Application Function (AF) [126a] is a network function that represents external applications interfacing with the 5G core network to access network capabilities and services.

[0075] User Plane Function (UPF) [128a] is a network function responsible for handling user data traffic, including packet routing, forwarding, and QoS enforcement.

[0076] Data Network (DN) [130a] refers to a network that provides data services to user equipment (UE) in a telecommunications system. The data services may include but are not limited to Internet services, private data network related services.

[0077] Referring to figure 1A, an exemplary system diagram depicting a system

[0100] for rerouting the registration request in accordance with exemplary embodiments of the present disclosure is shown.

[0078] The system comprises a storage unit

[0107] and a transceiver unit

[0101] , the transceiver unit

[0101] coupled to the storage unit

[0107] , wherein the transceiver enables a network node

[0106] to receive, via a Radio Access Network (RAN)

[0104] , the registration request for establishment of a connection between a User Equipment (UE)

[0102] and a target network node

[0108] , The term ‘storage unit’ serves as a repository for storing and managing data related to registration requests,authentication processes, and system operations. The term ‘transceiver unit’ is a combined transmitter and receiver component used in systems to facilitate the transmission and reception of signals. It enables communication between User Equipment (UE)

[0102] and network nodes by transmitting registration requests and receiving responses via the Radio Access Network (RAN). The transceiver unit

[0101] serves as the intermediary between the network node

[0106] and the user equipment (UE)

[0102] , responsible for managing communication flow. When the registration request is received via the Radio Access Network (RAN)

[0104] , the transceiver unit

[0101] directs it to the network node

[0106] for processing.

[0079] An authenticator unit

[0103] of the system is then configured to authenticate, at the network node

[0106] , an identity of the UE

[0102] based on a communication with a first authentication network node for the received registration request. The term ‘authenticator unit’ refers as a component within the network node

[0106] responsible for verifying the identity of the user equipment (UE)

[0102] attempting to connect to the network node

[0106] , It communicates with a first authentication network node to authenticate the UE

[0102] based on the received registration request. The system

[0100] is further enhanced by its ability to handle various network configurations. The network node

[0106] is as associated with the first Access And Mobility function (AMF1) [106A] of a specific network type, while the target network node

[0108] is as associated with the second access And mobility function (AMF2) [106B] of another network type. These networks, although isolated, belong to the same Public Land Mobile Network (PLMN) and offer distinct services to users.

[0080] A re-routing unit

[0105] of the system is then configured to re-route, at the network node

[0106] via the RAN

[0104] , the registration request to the target network node

[0108] based on a failure of the authentication of the identity of the UE

[0102] , The term ‘router unit’ is a networking device responsible for directing data packets between different networks. The first authentication network node, known as the first authentication server function (AUSF1) [108A], The router unit

[0105] at the network node

[0106] , re-routes the registration requests to the target network node

[0108] in the event of authentication failure. This ensures that registration requests are directed to the appropriate destination for further processing. In the event of authentication failure, a reception of a predefined error message, such as a 404 error, alerts the network node

[0106] about the unavailability of user data in the network. For instance, the error message is a 404 error message to indicate to the network node

[0106] that a user data is not provisioned in the first type of network. This information enables the system

[0100] to make informed decisions regarding re-routing strategies.

[0081] The authenticator unit

[0103] is therefore configured to authenticate, at the network node

[0106] , the identity of the UE

[0102] based on the communication with the first authentication network node for the received registration request. Thereafter, the re-routing unit

[0105] re-routes at the network node

[0106] via the RAN

[0104] , the registration request to the target network node

[0108] based on the failure of the authentication of the identity of the UE

[0102] , wherein the failure of the authentication corresponds to the reception of the error message from the first authentication network node (AUSF1) [108A] while authenticating the UE.

[0082] The authenticator unit

[0103] , at the target network node

[0108] , is also configured to authenticate the identity of the UE

[0102] based on a communication with a second authentication server function (AUSF2) [108B] of the second type of network. Further, the target network node

[0108] via an analyser unit

[0109] of the system, establishes the connection between the UE

[0102] and the target network node

[0108] based on a reception of a positive response from the second Authentication Server Function (AUSF2) [108B], This system, as described, may have extra functions to make it work better. For instance, when a device wants to join a network, a part of the network called the “target network node

[0108] ” checks if the device is allowed to join. It does this by talking to another part of the network called the “second Authentication Server Function [108B].” This check is done by a special unit called the “authenticator unit

[0103] .” Once the device's identity is confirmed, another part of the network, known as the “target network node

[0108] ,” uses the “analyser unit

[0109] ” to make sure the device can smoothly connect to the network.

[0083] Referring to Figure IB, an exemplary diagram of a communication network architecture [100B] for a Public Land Mobile Network (PLMN) network with two isolated network types is shown in accordance with exemplary embodiments of the present disclosure. As shown in Figure IB, the PLMN [100B] network has two isolated networks i.e., a network node

[0106] and a target network node

[0108] . The Network A / Network Node

[0106] may be such as, but not limited to, a cellular loT network, and the Network B / Target network node

[0108] may be such as, but not limited to, a mobility network. The UE

[0102] is connected to RAN

[0104] and may connect with AMF1 [106A] in the Network ‘A’ (e.g. cellular loT) or with AMF2 [106B] in the Network ‘B’ (e.g. mobility network) after performing authentication process from corresponding authentication function of network.

[0084] In an example, the procedure of re-routing a UE from an initial AMF to another or target AMF is performed based on network slicing, as discussed in 3 GPP technical specification.

[0085] According to another embodiment of the present disclosure, in a wireless communication system having two or more dedicated isolated networks e.g., a cellular loT network and a mobility network, existing simultaneously within a common public land mobile network (PLMN), one network may not have a user data of another network provisioned at its AUSF / UDM.

[0086] According to another embodiment of the present disclosure, when the initial AMF receives the registration request of the UE and the initial AMF is not the appropriate AMF to serve the UE, the AMF may receive an error from the AUSF during the authentication process. In an example, when the initial AMF receives the registration request of the UE and the initial AMF is not the appropriate AMF to serve the UE, the AMF may receive a 404 error message from the AUSF during the authentication process. Upon receiving such an error, e.g., a 404 error message, the AMF may initiate the re-routing procedure and may reject the registration request of the UE. In an example, the initial AMF may re-route the registration request message of the UE to a target AMF of the other dedicated isolated network existing simultaneously with a common PLMN and thus, the UE may be successfully registered at the desired and appropriate AMF of the network existing within the same or common PLMN. Expressed differently, the present disclosure allows the UE to be re-routed to an appropriate or target AMF of the desired network - existing within the common PLMN - thereby providing an efficient service in 5G communication environment.

[0087] In an exemplarily embodiment of the present disclosure, the wireless communication system includes two dedicated isolated networks e.g., a cellular loT and a mobility network, existing simultaneously within a common a Public Land Mobile Network (PLMN). That is, the two isolated networks are deployed with dedicated Authentication Server Function (AUSF), Unified Data Management (UDM), and the other network function entities.

[0088] According to the 3GPP technical specification, the process of re-routing a registration request of a UE to another AMF is performed based on network slicing. However, in a network deployment where the two isolated networks are completely isolated from each other e.g., a cellular loT network and a mobility network, one network may not have a user data of another network provisioned at its dedicated AUSF / UDM.

[0089] Exemplarily, when the registration request of a cellular loT user is received at an AMF of the mobility network, the AMF may receive an error message, e.g., a 404 error message fromthe AUSF during the authentication process. Upon receiving such an error message, the AMF of the mobility network may re-route the registration request of the cellular loT user to the AMF of the cellular loT network. Thus, the registration request of the cellular loT user is re-routed to the AMF of the cellular loT network and the UE is successfully registered at the cellular loT network.

[0090] According to another embodiment of the present disclosure, in case the re-routed target AMF is also not an appropriate AMF to serve the UE, the target AMF may reject the registration request of the UE thereby terminating the registration procedure. This ensures that the UE is not indefinitely re-routed among the isolated networks.

[0091] Referring to Figure 2A, an exemplary method flow diagram indicating a process

[0200] for re-routing registration request performed by an initial AMF with two isolated networks in same PLMN in a 5G network environment is shown in accordance with exemplary embodiments of the present disclosure is shown. In an implementation the method

[0200] is performed by one of the components of the system

[0100] for example, AMF.

[0092] In the 5G network environment, dedicated isolated networks e.g., a cellular loT network and a mobility network, exist simultaneously within a common a Public Land Mobile Network (PLMN). That is, the two or more isolated networks are deployed with dedicated Authentication Server Function (AUSF), Unified Data Management (UDM), and the other network function entities.

[0093] As shown in Figure 2, the method

[0200] starts at step

[0202] .

[0094] At step

[0204] , the method as disclosed by the present disclosure comprises receiving by a transceiver unit

[0101] , at a network node

[0106] via a radio access network (RAN)

[0104] , the registration request for establishment of a connection between a user equipment (UE)

[0102] and a target network node

[0108] , The network node

[0106] is associated with a first access and mobility management function (AMF1) [106A] of a first type of network. The target network node

[0108] is associated with a second access and mobility management function (AMF2) [106B] of a second type of network, wherein the first type of network and the second type of network are isolated networks and belong to a same public land mobile networks (PLMN) to provide different services to users.

[0095] According to the present disclosure, the first / initial AMF [106A] of network, such as, cellular loT network, receives an initial registration request message from a UE

[0102] , The registration request message from the UE

[0102] is routed to the initial AMF [106A] through a RAN / gNB

[0104] , The registration request message from the UE

[0102] includes, but not limited to, a first information that includes different parameters associated with the registration request message.

[0096] Next, at step

[0206] , the method

[0200] as disclosed by the present disclosure comprises authenticating by an authenticator unit

[0103] at, the network node

[0106] , an identity of the UE

[0102] based on a communication with a first authentication network node for the received registration request. The first authentication network node is a first authentication server function (AUSF1) [108 A] of the first type of network.

[0097] The initial AMF [106A] receives the registration request of the UE

[0102] and the initial AMF [ 106A] is not the appropriate or the target AMF to serve the UE

[0102] , the AMF [ 106A] then receives an error from the first authentication network node (AUSF1) [108A] during the authentication process. In an example, when the initial AMF [106A] receives the registration request of the UE

[0102] and the initial AMF [106A] is not the appropriate AMF to serve the UE, the AMF [106A] may receive a 404 error message from the AUSF1 [108A] during the authentication process. The error message is a 404 error message to indicate to the network node

[0106] that a user data is not provisioned in the first type of network.

[0098] Next, at step

[0208] , the method

[0200] as disclosed by the present disclosure comprises re-routing by a router unit

[0105] , at the network node

[0106] via a RAN (104), the registration request to the target network node

[0108] based on a failure of the authentication of the identity of the UE

[0102] , The failure of the authentication corresponds to a reception of an error message from the first authentication network node (AUSF1) [108 A] while authenticating the UE

[0102] , The error message is a 404 error message to indicate to the network node

[0106] that a user data is not provisioned in the first type of network. In response to receiving such an error (e.g., a 404 error message) from the AUSF1 [108A], the initial AMF [106A] may initiate a re-routing procedure to a target AMF [ 106B] of a different dedicated isolated network, such as, but not limited to, mobility network. In an example, the initial AMF [106A] may re-route the registration request message of the UE

[0102] to a target AMF [ 106B] through a RAN

[0104] of the other dedicated isolated network existing simultaneously with a common Public Land Mobile Network PLMN, as one network may not have a user data of another network provisioned at its AU SF / UDM and thus, the UE

[0102] maybe successfully registered at the desired and appropriate AMF [106B] of the network existing within the same or common PLMN.

[0099] In the implementation of the method, the method further comprises authenticating, by the target network node

[0108] via the authenticator unit

[0103] , the identity of the UE

[0102] based on a communication with a second Authentication Server Function (AUSF2) [108B] of the second type of network. The method then leads to establishing, by the target network node

[0108] via an analyzer unit

[0109] (or may be referred herein as analysis unit), the connection between the UE

[0102] and the target network node

[0108] based on a reception of a positive response from the second AUSF (AUSF2) [108B], The method may also involves additional steps to improve its functionality. For instance, when a device seeks to connect to a network, a node within the network, known as the "target network node

[0108] ," verifies if the device is permitted to join. This verification is conducted by interacting with another network component called the "second Authentication Server Function (AUSF2) [108B]." Utilizing a specialized component called the "Authenticator Unit

[0103] ," the network ensures that the device's identity is genuine. Once the device's identity is authenticated, another step is taken by the target network node

[0108] , which employs the "analyser unit

[0109] " to facilitate a seamless connection between the device and the network. These supplementary procedures enhance the system's ability to securely and efficiently accommodate device connections, ensuring a reliable and user-friendly network experience. Thereafter, the method terminates at step

[0210] ,

[0100] Referring to Figure 2B, an exemplary signalling flow diagram

[0300] indicating a process performed by an initial access and mobility management function (AMF) in a 5G network environment, in accordance with exemplary embodiments of the present disclosure is shown. In an implementation the method

[0300] is performed by at least one of the components of the system

[0100] for example, AMF, AUSF, UE and gNB.

[0101] In the 5G network environment, dedicated isolated networks e.g., a cellular loT network and a mobility network, exist simultaneously within a common a public land mobile network (PLMN).

[0102] As shown in Figure 2B, the method

[0300] starts at step [SI]

[0103] At step [SI], the method

[0300] as disclosed by the present disclosure depicts that a registration request is sent to gNB / RAN

[0204] from UE

[0202] .

[0104] At step [S2], the gNB / RAN

[0204] sends the registration request to first AMF

[0206] i.e., AMF-1

[0206] ,

[0105] At step [S3], the AMF-1

[0206] sends to AUSF-1

[0210] a NAUSF-AUTHENTICATION [NAS] to fetch authentication vectors from the AUSF-1

[0210] ,

[0106] At step [S4], AUSF-1

[0210] cannot locate user details or the authentication vectors, it sends 404 user not found error to AMF-1

[0206] .

[0107] At step [S5], The AMF-1

[0206] reroutes NAS with AMF set ID of AMF-2

[0208] to gNB / RAN

[0204] , The "AMF Set ID" uniquely identifies the AMF Set within the AMF region. It serves as a reference or identifier for a specific group of AMF instances within the network, allowing for efficient routing and management of registration requests and authentication procedures.

[0108] At step [S6], the gNB / RAN

[0204] then sends to AMF-2

[0208] the registration request and set ID corresponding to the AMF-2

[0208] ,

[0109] At step [S7], thereafter, AMF-2

[0208] sends to AUSF-2

[0212] NAUSF- AUTHENTI CATION [NAS] to fetch authentication vectors from the AUSF-2

[0212] ,

[0110] At last step [S8], the registration procedure is continued throughout and if the AUSF- 2

[0212] also responds with 404 User Not Found, then the registration is rejected.[oni] It is pertinent to note that the AMF1 and AUSF1 belongs to the same network node and AMF2 and AUSF2 belongs to same target network node.

[0112] Thereafter, the method

[0300] terminates at step [S8] .

[0113] Fig. 3 illustrates an exemplary block diagram of a computing device

[0600] upon which the features of the present disclosure may be implemented in accordance with exemplary implementation of the present disclosure. In an implementation, the computing device

[0600] may also implement the method

[0200] for re-routing registration request performed by an initial access and nobility management function (AMF) by utilising the system

[0600] , In another implementation, the computing device

[0600] itself implements the method

[0200] for re-routingregistration request performed by an initial access and nobility management function (AMF) using one or more units configured within the computing device

[0600] , wherein said one or more units are capable of implementing the features as disclosed in the present disclosure.

[0114] The computing device

[0600] may include a bus

[0602] or other communication mechanism for communicating information, and a hardware processor

[0604] coupled with bus

[0602] for processing information. The hardware processor

[0604] may be, for example, a general purpose microprocessor. The computer system

[0600] may also include amain memory

[0606] , such as a random access memory (RAM), or other dynamic storage device, coupled to the bus

[0602] for storing information and instructions to be executed by the processor

[0604] , The main memory

[0606] also may be used for storing temporary variables or other intermediate information during execution of the instructions to be executed by the processor

[0604] . Such instructions, when stored in non-transitory storage media accessible to the processor

[0604] , render the computer system

[0600] into a special-purpose machine that is customized to perform the operations specified in the instructions. The computer system

[0600] further includes a read only memory (ROM)

[0608] or other static storage device coupled to the bus

[0602] for storing static information and instructions for the processor

[0604] .

[0115] A storage device

[0610] , such as a magnetic disk, optical disk, or solid-state drive is provided and coupled to the bus

[0602] for storing information and instructions. The computer system

[0600] may be coupled via the bus

[0602] to a display

[0612] , such as a cathode ray tube (CRT), Liquid crystal Display (LCD), Light Emitting Diode (LED) display, Organic LED (OLED) display, etc. for displaying information to a computer user. An input device

[0614] , including alphanumeric and other keys, touch screen input means, etc. may be coupled to the bus

[0602] for communicating information and command selections to the processor

[0604] , Another type of user input device may be a cursor control

[0616] , such as a mouse, a trackball, or cursor direction keys, for communicating direction information and command selections to the processor

[0604] , and for controlling cursor movement on the display

[0612] , This input device typically has two degrees of freedom in two axes, a first axis (e.g., x) and a second axis (e.g., y), that allow the device to specify positions in a plane.

[0116] The computer system

[0600] may implement the techniques described herein using customized hard-wired logic, one or more ASICs or FPGAs, firmware and / or program logic which in combination with the computer system

[0600] causes or programs the computer system

[0600] to be a special-purpose machine. According to one implementation, the techniques herein are performed by the computer system

[0600] in response to the processor

[0604] executing one or moresequences of one or more instructions contained in the main memory

[0606] . Such instructions may be read into the main memory

[0606] from another storage medium, such as the storage device

[0610] , Execution of the sequences of instructions contained in the main memory

[0606] causes the processor

[0604] to perform the process steps described herein. In alternative implementations of the present disclosure, hard-wired circuitry may be used in place of or in combination with software instructions.

[0117] The computer system

[0600] also may include a communication interface

[0618] coupled to the bus

[0602] , The communication interface

[0618] provides a two-way data communication coupling to a network link

[0620] that is connected to a local network

[0622] , For example, the communication interface

[0618] may be an integrated services digital network (ISDN) card, cable modem, satellite modem, or a modem to provide a data communication connection to a corresponding type of telephone line. As another example, the communication interface

[0618] may be a local area network (LAN) card to provide a data communication connection to a compatible LAN. Wireless links may also be implemented. In any such implementation, the communication interface

[0618] sends and receives electrical, electromagnetic or optical signals that carry digital data streams representing various types of information.

[0118] The computer system

[0600] can send messages and receive data, including program code, through the network(s), the network link

[0620] and the communication interface

[0618] , In the Internet example, a server

[0630] might transmit a requested code for an application program through the Internet

[0628] , the ISP

[0626] , the local network

[0622] and the communication interface

[0618] , The received code may be executed by the processor

[0604] as it is received, and / or stored in the storage device

[0610] , or other non-volatile storage for later execution.

[0119] Moreover, an aspect of the present disclosure relates to a non-transitory computer- readable storage medium storing instructions for re-routing registration requests within a telecommunication network. These instructions entail executable code that, when executed by one or more units of the system the instructions facilitates: receiving, by a transceiver unit at a network node via a radio access network (RAN), the registration request for establishment of a connection between a user equipment (UE), and a target network node; authenticating, by an authenticator unit at the network node, an identity of the UE based on a communication with a first authentication network node for the received registration request; and re-routing, by a router unit at the network node via the RAN, the registration request to the target network node based on a failure of the authentication of the identity of the UE.

[0120] As is evident from the above, the present disclosure provides a technically advanced solution for re-routing the registration request of the UE to the desired or target AMF thereby improving the efficiency of service in 5G communication environment. Thus, the overall user experience in using the 5G services is enhanced since the present solution does not terminate the registration request of the UE and the UE does not have to again re-initiate registration request to a different AMF of the dedicated network.

[0121] The technical advancement of the proposed solution is that it enables seamless operation of 5G services in a 5G network environment. Still further, it avoids unnecessary transmission of registration request to a different AMF thereby saving the resources and battery consumption of the UE.

[0122] While considerable emphasis has been placed herein on the disclosed embodiments, it will be appreciated that many embodiments can be made and that many changes can be made to the embodiments without departing from the principles of the present disclosure. These and other changes in the embodiments of the present disclosure will be apparent to those skilled in the art, whereby it is to be understood that the foregoing descriptive matter to be implemented is illustrative and non-limiting.

[0123] Further, in accordance with the present disclosure, it is to be acknowledged that the functionality described for the various the components / units can be implemented interchangeably. While specific embodiments may disclose a particular functionality of these units for clarity, it is recognized that various configurations and combinations thereof are within the scope of the disclosure. The functionality of specific units as disclosed in the disclosure should not be construed as limiting the scope of the present disclosure. Consequently, alternative arrangements and substitutions of units, provided they achieve the intended functionality described herein, are considered to be encompassed within the scope of the present disclosure.

Claims

We Claim:

1. A method to re-route a registration request, the method comprising: receiving, by a transceiver unit [101] at a network node [106] via a radio access network (RAN) [104], the registration request for establishment of a connection between a user equipment (UE) [102], and a target network node [108]; authenticating, by an authenticator unit [103] at the network node [106], an identity of the UE [ 102] based on a communication with a first authentication network node for the received registration request; and re-routing, by a router unit [105] at the network node [106] via the RAN [104], the registration request to the target network node [108] based on a failure of the authentication of the identity of the UE [102],2. The method as claimed in claim 1, wherein the network node [106] is associated with a first access and mobility management function (AMF1) [106A] of a first type of network.

3. The method as claimed in claim 1, wherein the target network node [108] is associated with a second access and mobility management function (AMF2) [106B] of a second type of network, wherein the first type of network and the second type of network are isolated networks and belong to a same public land mobile networks (PLMN) to provide different services to users.

4. The method as claimed in claim 1, wherein the first authentication network node is a first authentication server function (AUSF1) [108A] of the first type of network.

5. The method as claimed in claim 4, wherein the failure of the authentication corresponds to a reception of an error message from the first authentication network node (AUSF1) [108 A] while authenticating the UE [102],6. The method as claimed in claim 5, wherein the error message is a 404 error message to indicate to the network node [106] that a user data is not provisioned in the first type of network.

7. The method as claimed in claim 3, further comprises:authenticating, by the target network node [108] via the authenticator unit [103], the identity of the UE [ 102] based on a communication with a second authentication server function (AUSF2) [108B] of the second type of network; and establishing, by the target network node [108] via an analyzer unit [109], the connection between the UE [102] and the target network node [108] based on a reception of a positive response from the second authentication server function (AUSF2) [ 108B] .

8. A system for re-routing a registration request, the system comprises: a storage unit [107]; a transceiver unit [101] coupled to the storage unit [107], wherein the transceiver unit [101] enables a network node [106] to receive, via a RAN [104], the registration request for establishment of a connection between a UE [102] and a target network node [108]; an authenticator unit [103] coupled to the transceiver unit [101], the authenticator unit [103] is configured to authenticate, at the network node [106], an identity of the UE [102] based on a communication with a first authentication network node for the received registration request; and a re-routing unit [105] coupled to the authenticator unit [103], the re-routing unit [105] is configured to re-route, at the network node [106] via the RAN [104], the registration request to the target network node [108] based on a failure of the authentication of the identity of the UE [102],9. The system as claimed in claim 8, wherein the network node [106] is associated with a first access and mobility management function (AMF1) [106A] of a first type of network.

10. The system as claimed in claim 8, wherein the target network node [108] is associated with a second access and mobility management function (AMF2) [106B] of a second type of network, wherein the first type of network and the second type of network are isolated networks and belong to a same public land mobile networks (PLMN) to provide different services to users.

11. The system as claimed in claim 8, wherein the first authentication network node is a first authentication server function (AUSF1) [108A] of the first type of network.

12. The system as claimed in claim 11, wherein the failure of the authentication corresponds to the reception of an error message from the first authentication network node (AUSF1) [108 A] while authenticating the UE.

13. The system as claimed in claim 12, wherein the error message is a 404 error message to indicate to the network node [106] that a user data is not provisioned in the first type of network.

14. The system as claimed in claim 10, wherein: the authenticator unit [ 103] is configured to authenticate, by the target network node [108], an identity of the UE [102] based on a communication with a second authentication server function (AUSF2) [108B] of the second type of network; and an analyzer unit [109] connected to the authenticator unit [103] is configured to establish, by the target network node [108], the connection between the UE [102] and the target network node [108] based on a reception of a positive response from the second authentication server function (AUSF2) [ 108B] .

15. A User Equipment (UE) device for re-routing a registration request, via a user interface (UI), the User Equipment (UE) comprising: a memory; and a processor coupled to the memory, wherein the processor is configured to: send a registration request to a network node [106], wherein the registration request is used for establishing a connection between the User Equipment (UE) [102], and a target network node [108], and wherein the connection is established between the UE and the target network node based on: authentication, at the network node [106], of an identity of the UE [102] based on a communication with a first authentication network node for the received registration request; and re-routing, by the network node [106] via the RAN [104], the registration request to the target network node [108] based on a failure of the authentication of the identity of the UE [102],16. A non-transitory computer-readable storage medium storing instructions for re-routing registration requests, the storage medium comprising executable code which, when executed, causes: a transceiver unit [ 101 ] to receive, at a network node [106] via a radio access network RAN [104], the registration request for establishment of a connection between a User Equipment (UE) [102] and a target network node [108];an authenticator unit [103] to authenticate, at the network node [106], an identity of the UE [102] based on a communication with a first authentication network node for the received registration request; and a re-routing unit [105] to re-route, at the network node [106] via the RAN [104], the registration request to the target network node [108] based on a failure of the authentication of the identity of the UE [102],

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