FORM 2
THE PATENTS ACT, 1970 (39 OF 1970) & THE PATENT RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
“METHOD AND SYSTEM FOR MANAGING NETWORK SLICE SELECTION IN A TELECOMMUNICATIONS NETWORK”
We, Jio Platforms Limited, an Indian National, of Office - 101, Saffron, Nr. Centre Point, Panchwati 5 Rasta, Ambawadi, Ahmedabad - 380006, Gujarat, India.
The following specification particularly describes the invention and the manner in which it is to be performed.

5 METHOD AND SYSTEM FOR MANAGING NETWORK SLICE SELECTION IN A
TELECOMMUNICATIONS NETWORK
FIELD OF INVENTION
10 [0001] Embodiments of the present disclosure generally relate to network performance
management systems. More particularly, embodiments of the present disclosure relate to managing network slice selection in a telecommunications network.
BACKGROUND
15
[0002] The following description of the 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 is used only to enhance the understanding of the reader with
20 respect to the present disclosure, and not as admissions of the 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
25 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
30 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. Further, reducing call drops and latency is of paramount importance in the telecommunications industry. Call
35 drops can be frustrating for users, and they can also result in lost revenue for service providers.
Latency, on the other hand, refers to the time it takes for data to travel from one device to another and can cause delays and disruptions in communication. The introduction of 5G technology promises to address these issues by delivering ultra-low latency and high-speed
2

5 data transmission. With 5G, call drops are going to be minimized, and users are going to
experience seamless, uninterrupted communication. Additionally, 5G technology may enable
the development of new applications and services that require high-speed, low-latency
communication, such as remote surgeries, autonomous vehicles, and virtual reality. The
reduction of call drops and latency is crucial in ensuring that users have access to reliable and
10 efficient communication services, and the 5G technology is a significant step towards achieving
this goal.
[0004] In the 5G communication system, a number of functional modules are provided,
for example an Access and Mobility Management Function (AMF), a Network Slice Selection
15 Function (NSSF), and/or a Network Repository Function (NRF), etc., one or more of which
interact with each other to implement multiple operations of the 5G communication system. The NSSF is one of the key components of 5G communication system. One such operation relates to assigning of a slice for a user equipment (UE) while doing 5G registration. For such operation, the AMF sends a slice selection request to the NSSF. As would be understood, the
20 5G service-based architecture may adopt the web’s client-server model, where the client may
be referred to as NF Service Consumer (for example, AMF) and the server may be referred to as NF Service Provider (for example, NSSF).
[0005] The NSSF is thereafter required to select the slice to the UE, as per the requirement
25 of different UEs. The 5G communication system can deploy multiple Network Slice Instances
delivering exactly the same features for distinct groups of UEs. The NSSF offers services to the AMF and the NSSF in a different PLMN via the NSSF service-based interface. Following are the key Network Slice Selection Function (NSSF) functionalities:
• Authorize the set of network slice instances for an AMF Availability (registration).
30 • Determining a Network Slice Selection Assistance Information (NSSAI) allowed for
selection of the slice.
• Determining the AMF Set /Candidate list to be used to serve the UE based on the AMF
Availability (registration).
35 [0006] In other words, the AMF, the NSSF, and the NRF, suitably communicate with each
other, for assigning the slice for the UE. In particular, the UE may be initially assigned with a default slice information. Whereas, when the UE moves from one location to another or from
3

5 a Home PLMN to the visited PLMN, the UE is required to be updated with a new slice
information in the visited PLMN. For such purposes, the UE sends 5G Registration request to the AMF of the visited PLMN. The AMF further sends the slice selection request to the NSSF. The NSSF is thus required to select the slice for the UE. It may be noted that the NSSF includes a slice database storing a slice data of a number of tracking area identifier (TAI) representative
10 of tracking area, and a number of slices authorized for each TAI. For selection of the slice, the
NSSF sends a query to retrieve an AMF candidate list for the requested slice from the NRF. Thereafter, the NSSF searches the AMF instance in the retrieved AMF candidate list. In case of positive search, the NSSF sends an authorized response to the AMF, however, in case of negative search, the NSSF sends an error response to the AMF. Further, the AMF assigns the
15 slice to the UE, upon receiving the authorization response. However, such method of selecting
the slice for the UE is a time-consuming process and is required to be worked in a faster manner.
[0007] Thus, there exists an imperative need in the art to provide a faster and efficient
20 system and method of selecting the slice for the UE, which the present disclosure aims to
address.
SUMMARY
[0008] This section is provided to introduce certain aspects of the present disclosure in a
25 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.
[0009] An aspect of the present disclosure may relate to a method for managing network
slice selection in a telecommunications network, the method comprising receiving, by a
30 transceiver unit, a slice selection request from an Access and Mobility Management Function
(AMF), wherein the slice selection request comprises one or more network slices supported by the AMF in a tracking area within a Public Land Mobile Network (PLMN). The method comprises verifying, by a verification unit, the one or more network slices based on a list of subscribed slices stored in a slice database to determine permissibility of each slice of the
35 one or more slices within the tracking area. The method comprises transmitting, by the
transceiver unit, a response to the AMF based on the verification, the response comprising a list of authorized network slices and one or more Tracking Area Identifiers (TAIs) associated with the list of authorized network slices.
4

5
[0010] In an exemplary aspect of the present disclosure, the method further comprises
storing, by a storing unit, a mapping of the list of authorized network slices and the one or more
Tracking Area Identifiers (TAIs) associated with the list of authorized network slices in the
10 slice database.
[0011] In an exemplary aspect of the present disclosure, the method further comprises
searching, by a searching unit, a requested slice of the slice selection request in the slice
database and transmitting, by the transceiver unit, one of an authorized response or an
15 unauthorized response to the AMF, wherein the authorized response is transmitted upon a
positive search and the unauthorized response is transmitted upon a negative search.
[0012] In an exemplary aspect of the present disclosure, the method further comprises
receiving, by the transceiver unit, an availability request from the AMF, wherein the
20 availability request comprises a list of network slices supported by the AMF for one or more
tracking area identifiers in a PLMN and storing, by the storing unit, the list of network slices supported by the AMF for one or more tracking area identifiers in the PLMN in a slice database in run-time.
25 [0013] In an exemplary aspect of the present disclosure, wherein upon receiving, from the
AMF, a subsequent network slice selection request comprising a requested slice and a subscribed slice, the method comprises verifying, by the verification unit, the requested slice based on the list of subscribed slices using the slice database to filter a set of valid slices querying, by a querying unit, the slice database for one or more AMF instances capable of
30 serving the filtered set of valid slices and transmitting, by the transceiver unit, a response to the
AMF with a list of AMF instances capable of serving the requested network slice.
[0014] In an exemplary aspect of the present disclosure, wherein managing network slice
selection is implemented at a Network Slice Selection Function (NSSF). 35
[0015] Another aspect of the present disclosure may relate to a system for managing
network slice selection in a telecommunications network, the system comprising a transceiver unit configured to receive a slice selection request from an Access and Mobility Management
5

5 Function (AMF), wherein the slice selection request comprises one or more network slices
supported by the AMF in a tracking area within a Public Land Mobile Network (PLMN). The
system comprising verification unit connected to at least the transceiver unit, wherein the
verification unit configured to verify the one or more network slices based on a list of
subscribed slices stored in a slice database to determine permissibility of each slice of the one
10 or more slices within the tracking area. The system comprising the transceiver unit configured
to transmit a response to the AMF based on the verification, the response comprising a list of authorized network slices and one or more Tracking Area Identifiers (TAIs) associated with the list of authorized network slices.
15 [0016] Yet another aspect of the present disclosure may relate to a non-transitory computer
readable storage medium storing instructions for managing network slice selection in a telecommunications network, the instructions include executable code which, when executed by a one or more units of a system, causes: a transceiver unit of the system to receive a slice selection request from an Access and Mobility Management Function (AMF), wherein the slice
20 selection request comprises one or more network slices supported by the AMF in a tracking
area within a Public Land Mobile Network (PLMN), a verification unit of the system to verify the one or more network slices based on a list of subscribed slices stored in a slice database to determine permissibility of each slice of the one or more slices within the tracking area, and the transceiver unit to transmit a response to the AMF based on the verification, the response
25 comprising a list of authorized network slices and one or more Tracking Area Identifiers (TAIs)
associated with the list of authorized network slices.
OBJECTS OF THE INVENTION
30 [0017] Some of the objects of the present disclosure, which at least one embodiment
disclosed herein satisfies are listed herein below.
[0018] It is an object of the present disclosure to provide a system and a method for faster
and efficiently assigning/reassigning the slice for the UE, by way of faster and efficient
35 retrieval of the slice information by the AMF from the Network Slice Selection Function
(NSSF).
6

5 [0019] It is another object of the present disclosure to provide a system and method for
maintaining, on a NSSF storage unit of the NSSF, a slice data comprising of an AMF candidate list, TAIs mapped thereto to each of the AMF candidate, and the slices authorized to each of the AMF.
10 [0020] It is yet another object of the present disclosure to provide a system and method for
determining the candidate AMF for the requested slice by the user equipment (UE).
DESCRIPTION OF THE DRAWINGS
15 [0021] 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. Also, the embodiments shown in the
20 figures are not to be construed as limiting the disclosure, but the possible variants of the method
and system according to the disclosure are illustrated herein to highlight the advantages of the disclosure. It will be appreciated by those skilled in the art that disclosure of such drawings includes disclosure of electrical components or circuitry commonly used to implement such components.
25
[0022] FIG. 1 illustrates an exemplary block diagram representation of 5th generation core
(5GC) network architecture.
[0023] FIG. 2 illustrates an exemplary block diagram of a computing device upon which
30 the features of the present disclosure may be implemented in accordance with exemplary
implementation of the present disclosure.
[0024] Fig. 3 illustrates an exemplary block diagram [300] of a system for managing
network slice selection in a telecommunications network in accordance with exemplary
35 implementations of the present disclosure.
7

5 [0025] Fig. 4 illustrates a method flow diagram [400] for managing network slice selection
in a telecommunications network in accordance with exemplary implementations of the present disclosure.
[0026] Fig. 5 illustrates an exemplary scenario signal flow diagram for managing network
10 slice selection in a telecommunications network in accordance with exemplary
implementations of the present disclosure.
[0027] The foregoing shall be more apparent from the following more detailed description
of the disclosure. 15
DETAILED DESCRIPTION
[0028] 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
20 disclosure. It will be apparent, however, that embodiments of the present disclosure may be
practiced without these specific details. Several features described hereafter may 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.
25
[0029] 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
30 changes may be made in the function and arrangement of elements without departing from the
spirit and scope of the disclosure as set forth.
[0030] 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
35 the art that the embodiments may be practiced without these specific details. For example,
circuits, systems, processes, and other components may be shown as components in block diagram form in order not to obscure the embodiments in unnecessary detail.
8

5 [0031] 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 may 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
10 could have additional steps not included in a figure.
[0032] 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
15 “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
20 to the term “comprising” as an open transition word—without precluding any additional or
other elements.
[0033] As used herein, a “processing unit” or “processor” or “operating processor”
includes one or more processors, wherein processor refers to any logic circuitry for processing
25 instructions. A 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 (Digital Signal Processing) 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
30 data processing, input/output processing, and/or any other functionality that enables the
working of the system according to the present disclosure. More specifically, the processor or processing unit is a hardware processor.
[0034] As used herein, “a user equipment”, “a user device”, “a smart-user-device”, “a
35 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
9

5 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
10 to implement the features of the present disclosure.
[0035] 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
15 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.
20 [0036] As used herein “interface” or “user interface refers to a shared boundary across
which two or more separate components of a system exchange information or data. The interface may also be referred to a set of rules or protocols that define communication or interaction of one or more modules or one or more units with each other, which also includes the methods, functions, or procedures that may be called.
25
[0037] All modules, units, components used herein, unless explicitly excluded herein, may
be software modules or hardware processors, the processors being a general-purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a
30 controller, a microcontroller, Application Specific Integrated Circuits (ASIC), Field
Programmable Gate Array circuits (FPGA), any other type of integrated circuits, etc.
[0038] As used herein the transceiver unit include at least one receiver and at least one
transmitter configured respectively for receiving and transmitting data, signals, information, or
35 a combination thereof between units/components within the system and/or connected with the
system.
10

5 [0039] As discussed in the background section, the current known solutions have several
shortcomings. The present disclosure aims to overcome the above-mentioned and other existing problems in this field of technology by providing method and system for managing network slice selection in a telecommunication network.
10 [0040] The present invention relates to a system and method for managing network slice
selection in a telecommunications network. As discussed in the background section, the current known solutions tackles the challenge of slow slice assignment/reassignment by streamlining the process within the network infrastructure. When the Access and Mobility Management Function (AMF) sends a request for a slice selection through a transceiver unit, it lists the
15 available network slices for a specific area. Further, the solution of the present disclosure as
disclosed herein swiftly checks these slices against a stored list in a database to confirm their suitability for that area. Then, the solution of the present disclosure as disclosed herein sends back a response to the AMF with the approved slices and their corresponding area identifiers. The solution also discloses storing this information in the database for future reference. Further,
20 the solution of the present disclosure as disclosed herein searches for requested slices, give
responses based on the search results, and manage subsequent requests efficiently. Implemented within the Network Slice Selection Function (NSSF), the solution of the present disclosure optimizes slice allocation and improves overall network performance.
25 [0041] Hereinafter, exemplary embodiments of the present disclosure will be described
with reference to the accompanying drawings.
[0042] FIG. 1 illustrates an exemplary block diagram representation of 5th generation core
(5GC) network architecture, in accordance with exemplary implementation of the present
30 disclosure. As shown in FIG. 1, the 5GC network architecture [100] includes a user equipment
(UE) [102], a radio access network (RAN) [104], an access and mobility management function (AMF) [106], a Session Management Function (SMF) [108], a Service Communication Proxy (SCP) [110], an Authentication Server Function (AUSF) [112], a Network Slice Specific Authentication and Authorization Function (NSSAAF) [114], a Network Slice Selection
35 Function (NSSF) [116], a Network Exposure Function (NEF) [118], a Network Repository
Function (NRF) [120], a Policy Control Function (PCF) [122], a Unified Data Management (UDM) [124], an application function (AF) [126], a User Plane Function (UPF) [128], a data network (DN) [130], wherein all the components are assumed to be connected to each other in
11

5 a manner as obvious to the person skilled in the art for implementing features of the present
disclosure.
[0043] Radio Access Network (RAN) [101b] is the part of a mobile telecommunications
system that connects user equipment (UE) [101a] to the core network (CN) and provides access
10 to different types of networks (e.g., 5G network). It consists of radio base stations and the radio
access technologies that enable wireless communication.
[0044] Access and Mobility Management Function (AMF) [106] is a 5G core network
function responsible for managing access and mobility aspects, such as UE registration,
15 connection, and reachability. It also handles mobility management procedures like handovers
and paging.
[0045] Session Management Function (SMF) [108] is a 5G core network function
responsible for managing session-related aspects, such as establishing, modifying, and
20 releasing sessions. It coordinates with the User Plane Function (UPF) for data forwarding and
handles IP address allocation and QoS enforcement.
[0046] Service Communication Proxy (SCP) [110] is a network function in the 5G core
network that facilitates communication between other network functions by providing a secure
25 and efficient messaging service. It acts as a mediator for service-based interfaces.
[0047] Authentication Server Function (AUSF) [112] 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. 30
[0048] Network Slice Specific Authentication and Authorization Function (NSSAAF)
[114] 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.
35 [0049] Network Slice Selection Function (NSSF) [116] 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.
12

5 [0050] Network Exposure Function (NEF) [118] is a network function that exposes
capabilities and services of the 5G network to external applications, enabling integration with third-party services and applications.
[0051] Network Repository Function (NRF) [120] is a network function that acts as a
10 central repository for information about available network functions and services. It facilitates
the discovery and dynamic registration of network functions.
[0052] Policy Control Function (PCF) [122] is a network function responsible for policy
control decisions, such as QoS, charging, and access control, based on subscriber information
15 and network policies.
[0053] Unified Data Management (UDM) [124] is a network function that centralizes the
management of subscriber data, including authentication, authorization, and subscription information. 20
[0054] Application Function (AF) [126] is a network function that represents external
applications interfacing with the 5G core network to access network capabilities and services.
[0055] User Plane Function (UPF) [128] is a network function responsible for handling
25 user data traffic, including packet routing, forwarding, and QoS enforcement.
[0056] Data Network (DN) [130] 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.
30
[0057] Fig. 2 illustrates an exemplary block diagram of a computing device [1000] 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 [1000] may also implement a method for managing network slice selection in a telecommunications
35 network utilising the system. In another implementation, the computing device [1000] itself
implements the method for managing network slice selection in the telecommunications network using one or more units configured within the computing device [1000], wherein said
13

5 one or more units are capable of implementing the features as disclosed in the present
disclosure.
[0058] The computing device [1000] may include a bus [1002] or other communication
mechanism for communicating information, and a hardware processor [1004] coupled with bus
10 [1002] for processing information. The hardware processor [1004] may be, for example, a
general purpose microprocessor. The computer system [1000] may also include a main memory [1006], such as a random access memory (RAM), or other dynamic storage device, coupled to the bus [1002] for storing information and instructions to be executed by the processor [1004]. The main memory [1006] also may be used for storing temporary variables or other
15 intermediate information during execution of the instructions to be executed by the processor
[1004]. Such instructions, when stored in non-transitory storage media accessible to the processor [1004], render the computer system [1000] into a special-purpose machine that is customized to perform the operations specified in the instructions. The computer system [1000] further includes a read only memory (ROM) [1008] or other static storage device coupled to
20 the bus [1002] for storing static information and instructions for the processor [1004].
[0059] A storage device [1010], such as a magnetic disk, optical disk, or solid-state drive
is provided and coupled to the bus [1002] for storing information and instructions. The computer system [1000] may be coupled via the bus [1002] to a display [1012], such as a
25 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 [1014], including alphanumeric and other keys, touch screen input means, etc. may be coupled to the bus [1002] for communicating information and command selections to the processor [1004]. Another type of user input device may be a cursor control [1016], such as a
30 mouse, a trackball, or cursor direction keys, for communicating direction information and
command selections to the processor [1004], and for controlling cursor movement on the display [1012]. 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.
35 [0060] The computer system [1000] 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 [1000] causes or programs the computer system [1000] to be a special-purpose machine. According to one implementation, the
14

5 techniques herein are performed by the computer system [1000] in response to the processor
[1004] executing one or more sequences of one or more instructions contained in the main
memory [1006]. Such instructions may be read into the main memory [1006] from another
storage medium, such as the storage device [1010]. Execution of the sequences of instructions
contained in the main memory [1006] causes the processor [1004] to perform the process steps
10 described herein. In alternative implementations of the present disclosure, hard-wired circuitry
may be used in place of or in combination with software instructions.
[0061] The computer system [1000] also may include a communication interface [1018]
coupled to the bus [1002]. The communication interface [1018] provides a two-way data
15 communication coupling to a network link [1020] that is connected to a local network [1022].
For example, the communication interface [1018] 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 [1018] may be a local area network (LAN) card to provide a data communication
20 connection to a compatible LAN. Wireless links may also be implemented. In any such
implementation, the communication interface [1018] sends and receives electrical, electromagnetic, or optical signals that carry digital data streams representing various types of information.
25 [0062] The computer system [1000] can send messages and receive data, including
program code, through the network(s), the network link [1020] and the communication interface [1018]. In the Internet example, a server [1030] might transmit a requested code for an application program through the Internet [1028], the ISP [1026], the local network [1022] and the communication interface [1018]. The received code may be executed by the processor
30 [1004] as it is received, and/or stored in the storage device [1010], or other non-volatile storage
for later execution.
[0063] Referring to Figure 3, an exemplary block diagram of a system [300] for managing
network slice selection in a telecommunications network is shown, in accordance with the
35 exemplary implementations of the present disclosure. The system [300] comprises at least one
transceiver unit [301], at least one verification unit [303], at least one storage unit [305], at least one searching unit [307] and at least one querying unit [309]. Also, all of the components/ units of the system [300] are assumed to be connected to each other unless otherwise indicated
15

5 below. As shown in the figures all units shown within the system should also be assumed to be
connected to each other. Also, in Fig. 1 only a few units are shown, however, the system [300]
may comprise multiple such units or the system [300] may comprise any such numbers of said
units, as required to implement the features of the present disclosure. Further, in an
implementation, the system [300] may reside in a server or a network entity. In yet another
10 implementation, the system [300] may reside partly in the server/ network entity.
[0064] The system [300] is configured for managing network slice selection in the
telecommunications network with the help of the interconnection between the components/units of the system [300].
15
[0065] The system comprising a transceiver unit [301] configured to receive a slice
selection request from an Access and Mobility Management Function (AMF) [106], wherein the slice selection request comprises one or more network slices supported by the AMF [106] in a tracking area within a Public Land Mobile Network (PLMN). The present disclosure
20 encompasses that the transceiver unit [301] is responsible for both transmitting and receiving
signals within the telecommunications network wherein managing network slice selection is implemented at a Network Slice Selection Function (NSSF) [116]. The "slice selection request" contains information about the one or more network slices supported by the AMF [106] within a particular tracking area. Further, the tracking area, represents a geographical region within
25 the Public Land Mobile Network (PLMN). The AMF [106] is responsible for managing user
mobility, manging network access, and communicates supported network slices within the tracking area to the NSSF [116] based on the slice selection request.
[0066] The verification unit [303] connected to at least the transceiver unit [301], wherein
30 the verification unit [303] configured to verify the one or more network slices based on a list
of subscribed slices stored in a slice database to determine permissibility of each slice of the
one or more slices within the tracking area. Further, as disclosed by the present disclosure the
verification unit [303] may check the suitability of one or more network slices based on a list
of subscribed slices stored in a slice database. Further, according to the present disclosure, the
35 verification unit [303] may checks if one or more network slices matches with the subscribed
slices in the slice database to determine if the one or more network slices are permissible within the tracking area. It is to be noted that the term subscribed slices refer to customizable,
16

5 virtualized network instances in accordance with user requirements within a network
infrastructure.
[0067] Further, the subscribed slices are the network slices that may be allocated to
subscribers based on their service needs and to enable diverse functionalities such as
10 differentiated quality of service (QoS), security, and resource allocation. The subscribed slices
are essentially isolated segments of the telecommunications network that are provisioned, managed, and optimized independently to meet the distinct demands of different users or applications. Further, it is to be noted that a network slice may determine as a permissible network slice in an event said network slice is a predefined segments of the telecommunications
15 network that adhere to a specified criteria, a predefined policies governing creation of said
network slice, a configuration, and a usage. The permissible network slice serves as predefined templates for deploying network services while ensuring adherence to predefined guidelines and regulations associated with the tracking area.
20 [0068] Further, upon receiving, from the AMF [106], a subsequent network slice selection
request comprising a requested slice and a subscribed slice, the verification unit [303] is configured to verify the requested slice based on the list of subscribed slices using the slice database to filter a set of valid slices. Further, as disclosed by the present disclosure, the verification of the requested slice may be performed by comparing the requested slice with the
25 list of subscribed slices stored in the slice database. In an event, if the requested slice matches
with any of the subscribed slice from the list of subscribed slices, it is considered as a valid slice and included in the filtered set of valid slices. Thereupon, the querying unit [309] is configured to query the slice database for one or more AMF instances capable of serving the filtered set of valid slices. As disclosed herein, the querying unit [309] may query the slice
30 database to identify the one or more AMF instances. These AMF instances are those that have
necessary capabilities (such as user authentication, authorization) to handle the filtered set of valid slices. The transceiver unit [301] is configured to transmit a response to the AMF [106] with a list of AMF instances capable of serving the requested network slice. This response assists the AMF [106] in determining which AMF instances that may be considered suitable
35 for handling the requested network slice i.e., the list of AMF instances capable of serving the
requested network slice.
17

5 [0069] Further, the transceiver unit [301] is configured to transmit a response to the AMF
[106] based on the verification, the response comprising a list of authorized network slices and one or more Tracking Area Identifiers (TAIs) associated with the list of authorized network slices. The present disclosure encompasses that the transceiver unit [301] within the Network Slice Selection Function (NSSF) [116] transmits the response to the Access and Mobility
10 Management Function (AMF) [106] based on the preceding verification process. The response
transmitted by the transceiver unit [301] to the AMF [106] serves communication between the NSSF [116] and the AMF [106]. Further, within said response, the NSSF [116] communicates the list of authorized network slices that are deemed permissible for the specific tracking area in question. Additionally, the response includes the one or more Tracking Area Identifiers
15 (TAIs), within the Public Land Mobile Network (PLMN). The TAIs are identifiers used within
the telecommunications network to designate specific tracking areas. Further, the TAIs are associated with network slices and are included in the response transmitted by the NSSF [116] to the AMF [106].
20 [0070] Further, as disclosed by the present disclosure, the searching unit [307] may be
configured to search a requested slice in the slice selection request in the slice database. Further, the searching unit [307] may locate the requested slice within the slice database to verify whether the “requested slice” that is part of the “network slice selection request” matches a slice that is already stored in the slice database. Further, upon searching the requested slice in
25 the slice selection request in the slice database, the transceiver unit [301] may be configured to
transmit one of an authorized response or an unauthorized response to the AMF [106], wherein the authorized response is transmitted upon a positive search and the unauthorized response is transmitted upon a negative search. The transceiver unit [301] transmit a response to the AMF [106] based on the outcome of the search performed by the searching unit [307]. Further, in a
30 scenario the searching unit [307] finds the requested slice in the slice database then it is referred
as the positive search, the transceiver unit [301] sends the authorized response to the AMF [106] and if the searching unit [307] fails to find the requested slice in the slice database i.e., the negative search, the transceiver unit [301] sends the unauthorized response to the AMF [106].
35
[0071] The present disclosure encompasses that the storing unit [305] is configured to
store a mapping of the list of authorized network slices and the one or more TAIs associated with the list of authorized network slices in the slice database. The storing unit [305] is
18

5 configured to maintain the mapping between the authorized network slices and their associated
Tracking Area Identifiers (TAIs) within the slice database.
[0072] Further, the transceiver unit [301] configured to receive an availability request from
the AMF [106], wherein the availability request comprises a list of network slices supported
10 by the AMF [106] for one or more tracking area identifiers in the PLMN. The availability
request contains information about network slices i.e., the list of network slices supported by the AMF [106] for specific tracking area identifiers within the PLMN and the storing unit [305] configured to store the list of network slices supported by the AMF [106] for one or more tracking area identifiers in the PLMN in a slice database in run-time. Upon receiving the
15 availability request from the AMF [106], the transceiver unit [301] forwards it to the storing
unit [305]. The storing unit [305] then updates the slice database with the list of network slices supported by the AMF [106] for the specified tracking area identifiers. This dynamic updating ensures that the slice database accurately reflects the available network slices for different tracking areas within the PLMN.
20
[0073] Referring to Figure 4, an exemplary method flow diagram [400] for managing
network slice selection in a telecommunications network in accordance with exemplary implementations of the present disclosure is shown. In an implementation the method [400] is performed by the system [300]. Further, in an implementation, the system [300] may be present
25 in a server device to implement the features of the present disclosure. Also, as shown in Figure
4, the method [400] starts at step [402].
[0074] At step 404, the method comprises receiving, by a transceiver unit [301], a slice
selection request from an Access and Mobility Management Function (AMF) [106], wherein
30 the slice selection request comprises one or more network slices supported by the AMF [106]
in a tracking area within a Public Land Mobile Network (PLMN). The present disclosure encompasses that the transceiver unit [301] is responsible for both transmitting and receiving signals within the telecommunications network wherein managing network slice selection is implemented at a Network Slice Selection Function (NSSF) [116]. The "slice selection request"
35 contains information about the one or more network slices supported by the AMF [106] within
a particular tracking area. Further, the tracking area, represents a geographical region within the Public Land Mobile Network (PLMN). The AMF [106] is responsible for managing user
19

5 mobility, manging network access, and communicates supported network slices within the
tracking area to the NSSF based on the slice selection request.
[0075] At step 406, the method comprises verifying, by a verification unit [303], the one
or more network slices based on a list of subscribed slices stored in a slice database to determine
10 permissibility of each slice of the one or more slices within the tracking area. Further, as
disclosed by the present disclosure the verification unit [303] may check the suitability of one or more network slices based on a list of subscribed slices stored in a slice database. Further, according to the present disclosure, the verification unit [303] may checks if one or more network slices matches with the subscribed slices in the slice database to determine if the one
15 or more network slices are permissible within the tracking area. It is to be noted that the term
subscribed slices refer to customizable, virtualized network instances in accordance with user requirements within a network infrastructure.
[0076] Further, the subscribed slices are the network slices that may be allocated to
20 subscribers based on their service needs and to enable diverse functionalities such as
differentiated quality of service (QoS), security, and resource allocation. The subscribed slices are essentially isolated segments of the telecommunications network that are provisioned, managed, and optimized independently to meet the distinct demands of different users or applications. Further, it is to be noted that a network slice may determine as a permissible
25 network slice in an event said network slice is a predefined segments of the telecommunications
network that adhere to a specified criteria, a predefined policies governing creation of said network slice, a configuration, and a usage. The permissible network slice serve as predefined templates for deploying network services while ensuring adherence to predefined guidelines and regulations associated with the tracking area.
30
[0077] Further, upon receiving, from the AMF [106], a subsequent network slice selection
request comprising a requested slice and a subscribed slice, the method comprises verifying, by the verification unit [303], the requested slice based on the list of subscribed slices using the slice database to filter a set of valid slices. Further, as disclosed by the present disclosure,
35 the verification of the requested slice may be performed by comparing the requested slice with
the list of subscribed slices stored in the slice database. In an event, if the requested slice matches with any of the subscribed slice from the list of subscribed slices, it is considered as a valid slice and included in the filtered set of valid slices. Thereupon, the querying, by a
20

5 querying unit [309], the slice database for one or more AMF instances capable of serving the
filtered set of valid slices. As disclosed herein, the querying unit [309] may query the slice
database to identify the one or more AMF instances. These AMF instances are those that have
necessary capabilities (such as user authentication, authorization) to handle the filtered set of
valid slices. The transmitting, by the transceiver unit [301], a response to the AMF [106] with
10 a list of AMF instances capable of serving the requested network slice. This response assists
the AMF [106] in determining which AMF instances are suitable for handling the requested network slice i.e., the list of AMF instances capable of serving the requested network slice.
[0078] At step 408, the method comprises transmitting, by the transceiver unit [301], a
15 response to the AMF [106] based on the verification, the response comprising a list of
authorized network slices and one or more Tracking Area Identifiers (TAIs) associated with
the list of authorized network slices. The present disclosure encompasses that the transceiver
unit [301] within the Network Slice Selection Function (NSSF) [116] transmits the response to
the Access and Mobility Management Function (AMF) [106] based on the preceding
20 verification process. The response transmitted by the transceiver unit [301] to the AMF [106]
serves communication between the NSSF [116] and the AMF [106]. Further, within said
response, the NSSF [116] communicates the list of authorized network slices that are deemed
permissible for the specific tracking area in question. Additionally, the response includes the
one or more Tracking Area Identifiers (TAIs), within the Public Land Mobile Network
25 (PLMN). The TAIs are identifiers used within the telecommunications network to designate
specific tracking areas. Further, the TAIs are associated with network slices and are included
in the response transmitted by the NSSF [116] to the AMF [106].
[0079] The present disclosure encompasses that searching, by a searching unit [307], may
30 be a requested slice of the slice selection request in the slice database. Further, the searching
unit [307] may locate the requested slice within the slice database to verify whether the
“requested slice” that is part of the “network slice selection request” matches a slice that is
already stored in the slice database. Further, the transmitting, by the transceiver unit [301], may
be one of an authorized response or an unauthorized response to the AMF [106], wherein the
35 authorized response is transmitted upon a positive search and the unauthorized response is
transmitted upon a negative search. The transceiver unit [301] transmit a response to the AMF [106] based on the outcome of the search performed by the searching unit [307]. Further, in a scenario the searching unit [307] finds the requested slice in the slice database then it is referred

5 as the positive search, the transceiver unit [301] sends the authorized response to the AMF
[106] and if the searching unit [307] fails to find the requested slice in the slice database i.e., the negative search, the transceiver unit [301] sends the unauthorized response to the AMF [106].
10 [0080] The present disclosure encompasses that storing, by a storing unit [305], a mapping
of a list of authorized network slices and one or more Tracking Area Identifiers (TAIs) associated with the list of authorized network slices in the slice database. The storing unit [305] is configured to maintain the mapping between the authorized network slices and their associated Tracking Area Identifiers (TAIs) within the slice database.
15
[0081] Further receiving, by the transceiver unit [301], an availability request from the
AMF [106], wherein the availability request comprises a list of network slices supported by the AMF [106] for one or more tracking area identifiers in the PLMN. The availability request contains information about network slices i.e., the list of network slices supported by the AMF
20 [106] for specific tracking area identifiers within the PLMN and storing, by the storing unit,
the list of network slices supported by the AMF [106] for one or more tracking area identifiers in the PLMN in a slice database in run-time. Upon receiving the availability request from the AMF [106], the transceiver unit [301] forwards it to the storing unit [305]. The storing unit [305] then updates the slice database with the list of network slices supported by the AMF
25 [106] for the specified tracking area identifiers. This dynamic updating ensures that the slice
database accurately reflects the available network slices for different tracking areas within the PLMN.
[0082] Thereafter, the method terminates at step 410.
30
[0083] Referring to Figure 5, an exemplary scenario signal flow [500] diagram for
managing network slice selection in a telecommunications network is shown, in accordance with the exemplary implementations of the present disclosure.
35 [0084] At step S1: a Network function (NF) service consumer (e.g. an access and mobility
management function (AMF)) may send a PUT request to a Network Slice Selection Function (NSSF). The PUT request may include Network Slice Selection Assistance Information (NSSAI) Availability information of the NF. As described previously, in a 5G service-based

5 architecture, NF service consumer may be understood as a client, while the NSSF may be
understood as the server.
[0085] The NF service consumer may send the PUT request to the NSSF. As would be
understood, the PUT method is a HTTP method of requests that the enclosed entity be stored
10 under the supplied URI (Uniform Resource Identifier). If the URI refers to an already existing
resource, it is modified and if the URI does not point to an existing resource, then the server can create the resource with that URI. The PUT method is used by AMF while registering for first time in Network.
15 [0086] As described previously, the PUT method may include NSSAI availability
information of the NF. “NSSAI” may refer to the set of parameters used to identify and describe a network slice. NSSAI may include two key elements:
[0087] ⦁ Slice Differentiator (SD): It is a globally unique identifier that distinguishes
between different network slices within a 5G network. The SD is used to ensure that the UE
20 selects the correct slice during communication.
[0088] ⦁ Slice Service Type (SST): It indicates the specific service or application type
associated with a network slice. The SST provides high-level information about the characteristics and requirements of a slice, such as low latency, high bandwidth, or ultra-reliable communication (URLLC).
25
[0089] At step S2: On success, "204 No content" shall be returned if Authorized NSSAI
Availability is empty after the update; otherwise, "200 OK" shall be returned,
[0090] At step S3: The NF Service consumer (e.g. AMF) shall send a GET request to the
30 NSSF. The request shall include query parameters.
[0091] At step S4: On success, "200 OK" shall be returned when the NSSF is able to find
authorized network slice information for the requested network slice selection information, 2b
If no slice instances can be found for the requested slice selection information, then the NSSF
35 shall return a 403 Forbidden response with the "ProblemDetails”.
[0092] The present disclosure further discloses a non-transitory computer readable storage
medium storing instructions for managing network slice selection in a telecommunications

5 network the instructions include executable code which, when executed by a one or more units
of a system, causes a transceiver unit [301] of the system to receive a slice selection request from an Access and Mobility Management Function (AMF) [106], wherein the slice selection request comprises one or more network slices supported by the AMF [106] in a tracking area within a Public Land Mobile Network (PLMN). The verification unit [303] of the system to
10 verify the one or more network slices based on a list of subscribed slices stored in a slice
database to determine permissibility of each slice of the one or more slices within the tracking area and transceiver unit [301] to transmit a response to the AMF [106] based on the verification, the response comprising a list of authorized network slices and one or more Tracking Area Identifiers (TAIs) associated with the list of authorized network slices.
15
[0093] As is evident from the above, the present disclosure provides a technically
advanced solution for managing network slice selection in a telecommunications network. The present disclosure provides the solution to the challenge of selecting slices for User Equipment
20 (UE) in 5G communication systems. The solution as disclosed in the present disclosure lies in
an optimized solution that swiftly identifies the most suitable slice for each UE based on a range of parameters including network conditions, the UE requirements, and available resources. This solution significantly accelerates the slice selection process, ensuring rapid service provisioning.
25
[0094] While considerable emphasis has been placed herein on the disclosed
implementations, it will be appreciated that many implementations can be made and that many changes can be made to the implementations without departing from the principles of the present disclosure. These and other changes in the implementations of the present disclosure
30 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.
[0095] 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
35 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.

5 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.

We Claim:
1. A method for managing network slice selection in a telecommunications network, the
method comprising:
receiving, by a transceiver unit [301], a slice selection request from an Access and Mobility Management Function (AMF) [106], wherein the slice selection request comprises one or more network slices supported by the AMF [106] in a tracking area within a Public Land Mobile Network (PLMN);
verifying, by a verification unit [303], the one or more network slices based on a list of subscribed slices stored in a slice database to determine permissibility of each slice of the one or more slices within the tracking area; and
transmitting, by the transceiver unit [301], a response to the AMF [106] based on the verification, the response comprising a list of authorized network slices and one or more Tracking Area Identifiers (TAIs) associated with the list of authorized network slices.
2. The method as claimed in claim 1, wherein the method comprises storing, by a storing unit [305], a mapping of the list of authorized network slices and the one or more Tracking Area Identifiers (TAIs) associated with the list of authorized network slices in the slice database.
3. The method as claimed in claim 2, the method further comprises:
searching, by a searching unit [307], a requested slice of the slice selection request in the slice database; and
transmitting, by the transceiver unit [301], one of an authorized response or an unauthorized response to the AMF [106], wherein the authorized response is transmitted upon a positive search and the unauthorized response is transmitted upon a negative search.
4. The method as claimed in claim 1, the method further comprises:
receiving, by the transceiver unit [301], an availability request from the AMF [106], wherein the availability request comprises a list of network slices supported by the AMF [106] for one or more tracking area identifiers in the PLMN; and

storing, by the storing unit, the list of network slices supported by the AMF [106] for one or more tracking area identifiers in the PLMN in a slice database in run-time.
5. The method as claimed in claim 1, wherein upon receiving, from the AMF [106], a
subsequent network slice selection request comprising a requested slice and a subscribed
slice, the method comprises:
verifying, by the verification unit [303], the requested slice based on the list of subscribed slices using the slice database to filter a set of valid slices;
querying, by a querying unit [309], the slice database for one or more AMF instances capable of serving the filtered set of valid slices; and
transmitting, by the transceiver unit [301], a response to the AMF [106] with a list of AMF instances capable of serving the requested network slice.
6. The method as claimed in claim 1, wherein managing network slice selection is
implemented at a Network Slice Selection Function (NSSF) [116].
7. A system for managing network slice selection in a telecommunications network, the
system comprising:
a transceiver unit [301] configured to receive a slice selection request from an Access and Mobility Management Function (AMF) [106], wherein the slice selection request comprises one or more network slices supported by the AMF [106] in a tracking area within a Public Land Mobile Network (PLMN);
a verification unit [303] connected to at least the transceiver unit [301], wherein the verification unit [303] configured to verify the one or more network slices based on a list of subscribed slices stored in a slice database to determine permissibility of each slice of the one or more slices within the tracking area; and
the transceiver unit [301] configured to transmit a response to the AMF [106] based on the verification, the response comprising a list of authorized network slices and one or more Tracking Area Identifiers (TAIs) associated with the list of authorized network slices.
8. The system as claimed in claim 7, wherein the system comprises a storing unit [305]
configured to store a mapping of the list of authorized network slices and the one or more
TAIs associated with the list of authorized network slices in the slice database.

9. The system as claimed in claim 8, comprises:
a searching unit [307] configured to search a requested slice in the slice selection request in the slice database; and
the transceiver unit [301] configured to transmit one of an authorized response or an unauthorized response to the AMF [106], wherein the authorized response is transmitted upon a positive search and the unauthorized response is transmitted upon a negative search.
10. The system as claimed in claim 7, comprises:
the transceiver unit [301] configured to receive an availability request from the AMF [106], wherein the availability request comprises a list of network slices supported by the AMF [106] for one or more tracking area identifiers in the PLMN; and
the storing unit [305] configured to store the list of network slices supported by the AMF [106] for one or more tracking area identifiers in the PLMN in a slice database in run-time.
11. The system as claimed in claim 7, wherein upon receiving, from the AMF [106], a
subsequent network slice selection request comprising a requested slice and a subscribed
slice:
the verification unit [303] is configured to verify the requested slice based on the list of subscribed slices using the slice database to filter a set of valid slices;
a querying unit [309] is configured to query the slice database for one or more AMF instances capable of serving the filtered set of valid slices; and
the transceiver unit [301] is configured to transmit a response to the AMF [106] with a list of AMF instances capable of serving the requested network slice.
12. The system as claimed in claim 7, wherein managing network slice selection is
implemented at a Network Slice Selection Function (NSSF) [116].
Dated this 3rd day of July 2023
(GARIMA SAHNEY)
IN/P-1826
AGENT FOR THE APPLICANT(S)
OF SAIKRISHNA & ASSOCIATES